CN100504253C - Expansion valve and refrigeration device - Google Patents

Abstract

An expansion valve has a valve main body (1), and in the valve main body (1) are arranged a first restriction section (5) and a second restriction section (6) on the downstream side of the first restriction section (5). The second restriction section (6) is constructed from the outer peripheral surface of a second valve body section (16) and the inner peripheral surface of a second valve hole (13). A spiral groove, a straight groove or other kind of groove is formed in the outer peripheral surface of the second valve body section (16) or in the inner peripheral surface of the second valve hole (13). Further, either the outer peripheral surface of the second valve body section (16) or the inner peripheral surface of the second valve hole (13) is tapered toward the tip of the valve body (4).

Description

Expansion valve and refrigerating plant

Technical field

The present invention relates to expansion valve and refrigerating plant.

Background technology

In the past, separate type air conditioner had refrigerating circuit for example shown in Figure 23.This refrigerating circuit has compressor 201, outdoor coil 202, expansion valve 203 and indoor coil 204.Compressor 201 and outdoor coil 202 are accommodated in the outdoor unit 205, and expansion valve 203 and indoor coil 204 are accommodated in the indoor unit 206.Expansion valve 203 for example uses electric expansion valve shown in Figure 24.

Electric expansion valve has valve body 210, is formed with ingress port 211 and outlet port 212 on valve body 210.Be formed with valve chamber 213 and cold-producing medium circulation flow path 214 in valve body 210, ingress port 211 and outlet port 212 are communicated with via valve chamber 213 and cold-producing medium circulation flow path 214.On valve body 210, be formed with next door 216 with valve opening 217.Spool 215 is accommodated in the valve chamber 213 in the mode of its front end towards the valve opening 217 in next door 216.Leading section at spool 215 is provided with tapered portion 218, is formed with restriction 219 between this tapered portion 218 and valve opening 217.Spool 215 is for example advanced and retreat with respect to valve opening 217 by pulse motor drive divisions such as (not shown), thus, regulates the aperture (amount of restriction of restriction 219) of valve opening 217.

The cold air operation circulation of separate type air conditioner is described with reference to Figure 23 here.At first be transported to outdoor coil 202 by the high-pressure gas refrigerant after compressor 201 compressions.In outdoor coil 202, carry out heat exchange between cold-producing medium and the atmosphere, condensation thus, liquefaction.Cold-producing medium after the liquefaction is imported in the valve body 210 of expansion valve 203 via liquid pipe 207 and ingress port 211.The cold-producing medium that is imported in the valve body 210 passes out to indoor coil 204 via restriction 219 and outlet port 212.Be sent between the cold-producing medium of indoor coil 204 and the room air and carry out heat exchange, evaporate thus, gasify, become low-pressure refrigerant gas, turn back to compressor 201 once more.

In separate type air conditioner, because Unit Installation condition and operating condition etc. produce bubble sometimes in the liquid pipe 207 of junction chamber exterior loop 202 and expansion valve 203.And when producing slug flow or plug flow etc. in this bubble becomes big, cold-producing medium, liquid refrigerant and gas refrigerant alternately flow through restriction 219.Under this situation, change of the flow velocity of cold-producing medium and pressure oscillation become big, consequently, near the outlet of expansion valve 203, give birth to abnormal sound by the cold-producing medium miscarriage.When the heating installation running of heat pump type air conditioner, also there is same problem.

Therefore, in order to reduce the pulsation of cold-producing medium stream, the known method (A method in the past) that has the aggregate that thin path is set to come cold-producing medium stream is carried out rectification near the outlet of restriction.Particularly, near the structure that the aggregate of porous body or superfine pipe is set the outlet of restriction is disclosed in the patent documentation 1, and, the structure that the antipriming pipe (honeycomb pipe) tying up superfine pipe and form or molecular sieve (molecular sieves) etc. are set is disclosed in patent documentation 2 near the outlet of restriction.And the method (B method in the past) that near the shape of the stream the outlet of restriction is changed also is known.Particularly, disclose following structure in patent documentation 1: near the internal diameter the outlet of the throttle orifice (orifice) of formation valve opening becomes big interimly or continuously, forms cone-shaped, and at the inner peripheral surface of valve opening groove is set.In addition, restriction is formed 2 level structures, produce intermediate pressure between level and level, it also is known making the method (C method in the past) of the energy of flow dispersion of cold-producing medium.Particularly, the structure that disposes the throttle orifice (orifice) of 2 level structures in the restriction of refrigerant flow path is disclosed in patent documentation 3.And then, in patent documentation 4, disclose restriction has been formed 1 level structure, form the method (D method in the past) of this restriction by a plurality of cold-producing medium circulation flow paths.

Patent documentation 1: Japanese kokai publication hei 7-146032 communique

Patent documentation 2: Japanese kokai publication hei 11-325658 communique

Patent documentation 3: Japanese kokai publication hei 5-322381 communique

Patent documentation 4: Japanese kokai publication hei 5-288286 communique

But, under the situation of A method in the past, have the shortcoming of in superfine path, stopping up foreign matter easily.And, since the mechanical strength of porous plastid, antipriming pipe, superfine pipe, molecular sieve etc. all a little less than, deform easily, thus aspect the reliability of electric expansion valve existing problems.

Under the situation of B method in the past, the spouting velocity that is difficult to atomized refrigerant that will be by restriction keeps constant.And, can not and it be disperseed equably with the segmentation of the bubble in the cold-producing medium, be difficult near the pressure the restriction is kept constant.Because these reasons can not fully reduce the abnormal sound of being given birth to by the cold-producing medium miscarriage.

Under the situation of C method in the past, need make the circulating resistance of cold-producing medium become big by the restriction in downstream, so near the jet speed the outlet of expansion valve become big.And, because the restriction of 2 level structures is made of the short throttle orifice of path-length, so producing near the restriction of upstream side under the situation of pressure oscillation, near the spouting velocity the outlet of expansion valve changes the effect of the abnormal sound that can not be reduced fully widely.And in this case, there are the following problems: be difficult to make each restriction while full cut-off of 2 level structures, under this state, produce intermediate pressure between two restriction, can't keep this.

Under the situation of D method in the past, because the flow path area of restriction is big, so can not carry out the flow-control of cold-producing medium accurately.If reduce to constitute the sectional area of each cold-producing medium circulation flow path of restriction for fear of this problem, then can produce the foreign matter problem of stopping up or nip etc.

Summary of the invention

The object of the present invention is to provide a kind of abnormal sound that is produced can reduce gas-liquid two-phase cold-producing medium stream by restriction the time and can not damage the expansion valve of reliability, and have the refrigerating plant of this expansion valve.

In order to solve above-mentioned problem, according to a first aspect of the invention, expansion valve has: valve body; Be formed on ingress port and outlet port on the described valve body; Be formed on the valve chamber in the described valve body; Be formed in the described valve body, connect the cold-producing medium circulation flow path of described ingress port and outlet port via described valve chamber; Be accommodated in the spool in the described valve chamber; Be formed on the 1st restriction on the described cold-producing medium circulation flow path; And the 2nd restriction that on described cold-producing medium circulation flow path, is formed on the downstream of described the 1st restriction, described valve body has the 1st next door of the cold-producing medium stream that separates in the described cold-producing medium circulation flow path, the 2nd next door with the cold-producing medium in the downstream that separates described the 1st next door stream, on described the 1st next door, be formed with the 1st valve opening, on described the 2nd next door, be formed with the 2nd valve opening, described spool is made of bar-like member, be formed with on the outer peripheral face of this bar-like member and described the 1st valve opening between form the 1st spool portion of described the 1st restriction, and and described the 2nd valve opening between form the 2nd spool portion of described the 2nd restriction, can change the aperture of described the 1st restriction by described the 1st spool portion is advanced and retreat with respect to the valve seat of described the 1st valve opening, on the inner peripheral surface of the outer peripheral face of described the 2nd spool portion or described the 2nd valve opening, be formed with groove, at least one side in the inner peripheral surface of the outer peripheral face of described the 2nd spool portion and described the 2nd valve opening forms cone-shaped towards the front end of described spool, described the 2nd restriction by be formed on described groove and and the inner peripheral surface of the outer peripheral face of right described the 2nd spool portion of this groove face or described the 2nd valve opening between path constitute.

By as above constituting, when in expansion valve, producing slug flow or plug flow, by the 1st restriction and the 2nd restriction of being located at its downstream, can suppress the decompression amount of the 1st restriction lower, can reduce near the ejection energy of the cold-producing medium of the 1st restriction.And, can be by the 2nd restriction to carrying out rectification by the cold-producing medium after the 1st restriction.Thus, for the cold-producing medium that flows to pipe arrangement from the 2nd restriction, its speed reduces, and thereupon, kinergety also reduces.Thereby the flow velocity change and the pressure oscillation of cold-producing medium are suppressed lessly, can be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

And at least one side in the inner peripheral surface of the outer peripheral face of the 2nd spool portion and the 2nd valve opening forms conical in shape towards the leading section of spool.Therefore, when the aperture of the 1st restriction reduced, the aperture of the 2nd restriction also reduced, the foreign matter of nipping easily, and on the other hand, when the aperture of the 1st restriction increased, the aperture of the 2nd restriction also increased, and can easily wash away the foreign matter of being nipped by cold-producing medium.Like this, according to this structure, owing to can avoid the obstruction of foreign matter, so can not produce problems such as the action of spool is bad.

In above-mentioned expansion valve, but preferred described the 1st restriction is advanced and retreat and full cut-off with respect to the valve seat of described the 1st valve opening by making described the 1st spool portion.In this case, but because the 1st restriction full cut-off, so can fully guarantee to make the needed amount of restriction of the 1st restriction full cut-off.

In above-mentioned expansion valve, the outer peripheral face of preferred described the 2nd spool portion and the inner peripheral surface of described the 2nd valve opening all form cone-shaped towards the front end of described spool.In this case, when increasing the aperture of the 2nd restriction, have a side the face of groove and the variable quantity in the gap of the opposing party's who faces mutually with this face face and reduce.Therefore, can make the path that constitutes the 2nd restriction effectively to cold-producing medium generation effect, and irrelevant with the aperture of the 2nd restriction.Thereby,, also can give full play to the flow velocity change of inhibition cold-producing medium and the effect of pressure oscillation even increase the aperture of the 2nd restriction.

In above-mentioned expansion valve, the outer peripheral face of preferred described the 2nd spool portion is identical with the angle of taper of the inner peripheral surface of described the 2nd valve opening.For example, be under the spiral fluted situation at groove, because big variation can not take place because of the aperture of valve the sectional area of the refrigerant passage that is made of helicla flute etc., so can play consistently effect with the segmentation of the bubble in the cold-producing medium.

In above-mentioned expansion valve, preferred described groove is formed on the outer peripheral face of described the 2nd spool portion.In this case, the processing of groove becomes easy.

In above-mentioned expansion valve, preferred described spool has described the 1st spool portion at leading section, has described the 2nd spool portion at pars intermedia.In this case, because the external diameter of the 2nd spool portion becomes big, so can relax restriction in the design of the total length of groove and the quantity of groove etc.Therefore, be used to relax the flow velocity change of cold-producing medium and the design of pressure oscillation and become easy.

In above-mentioned expansion valve, preferably be formed with the amplification spatial portion at cold-producing medium circulation flow path from described the 1st restriction to described the 2nd restriction.In this case, in amplifying spatial portion, easily produce vortex by the cold-producing medium fluid capacitance after the 1st restriction.By the generation of this vortex, consume the kinergety of cold-producing medium stream, thereby can relax the flow velocity change and the pressure oscillation of cold-producing medium effectively.

In above-mentioned expansion valve, preferred described the 1st spool portion has and is used to make by the guide portion of the stream of the cold-producing medium behind described the 1st valve opening at described amplification spatial portion intrinsic deflection.In this case, owing to,, can further relax the flow velocity change and the pressure oscillation of the cold-producing medium that flows through the 2nd restriction so the kinergety that the cold-producing medium that sprays from the 1st restriction flows consumes easily in the generation of amplifying spatial portion promotion vortex.

In above-mentioned expansion valve, preferred described groove is a helicla flute, described the 2nd restriction by be formed on described helicla flute and and the inner peripheral surface of the outer peripheral face of right described the 2nd spool portion of this spiral groove face or described the 2nd valve opening between the helical form path constitute.In this case, because the total length of the path of formation the 2nd restriction is longer,, can further relax the flow velocity change and the pressure oscillation of cold-producing medium so can make the kinergety consumption of cold-producing medium effectively.

In above-mentioned expansion valve, preferred described the 1st spool portion is formed on the leading section of described spool, described the 2nd spool portion is formed on the pars intermedia of this spool, the inner peripheral surface of described the 2nd spool portion and described the 2nd valve opening forms cone-shaped towards the front end of described spool, described groove is a helicla flute, and the end of downstream side of described the 2nd spool portion is configured in described the 2nd valve opening in from minimum of a value to peaked scope in the aperture of described the 2nd restriction.In this case, can avoid the cold-producing medium miscarriage after the 2nd restriction is carried out rectification to give birth to unnecessary disorder.

In above-mentioned expansion valve, preferred the 1st spool portion is formed on the leading section of described spool, the 2nd spool portion is formed on the pars intermedia of described spool, the inner peripheral surface of the outer peripheral face of described the 2nd spool portion and described the 2nd valve opening forms cone-shaped towards the front end of described spool, described groove is a helicla flute, from described the 1st restriction to the refrigerant passage of described the 2nd restriction, be formed with the amplification spatial portion near the inlet of described the 2nd valve opening, the upstream-side-end of described the 2nd spool portion is configured in the described amplification spatial portion in from minimum of a value to peaked scope in the aperture of described the 2nd restriction.In this case, in amplifying spatial portion, give birth to vortex by the miscarriage of the cold-producing medium after the 1st restriction.Thereby, can make the kinergety consumption of cold-producing medium stream effectively, can further reduce the abnormal sound of giving birth to by the cold-producing medium miscarriage.

In above-mentioned expansion valve, preferred described helicla flute is formed on the outer peripheral face of described the 2nd spool portion.In this case, spiral fluted processing becomes easy.

In above-mentioned expansion valve, preferred described the 2nd spool portion is identical with the angle of taper of described the 2nd valve opening.In this case, when increasing the aperture of the 2nd restriction, have a side the face of groove and the variable quantity in the gap of the opposing party's who faces mutually with this face face and reduce.Thereby, can make the helical form path that constitutes the 2nd restriction effectively to cold-producing medium generation effect, and irrelevant with the aperture of the 2nd restriction.

In above-mentioned expansion valve, the angle of taper of preferred described the 1st spool portion is bigger than the angle of taper of described the 2nd valve opening.In this case, follow the spool advance and retreat, the restriction effect of the 1st restriction is changed than the 2nd restriction biglyyer.

In above-mentioned expansion valve, the angle of taper of preferred described the 2nd valve opening is in the scope of 5 degree～60 degree.In this case, when the 2nd restriction standard-sized sheet, can remove the foreign matter in the gap of inner peripheral surface of nip spiral fluted ridge and the 2nd valve opening.

In above-mentioned expansion valve, preferably the gap between near described the 1st spool portion that forms the outlet of described the 1st restriction and the 1st valve opening is littler than the minimum of a value in described the 2nd spool portion that forms in described the 2nd restriction and the gap between described the 2nd valve opening.In this case, can make the restriction effect of the 1st restriction bigger, and can suppress the obstruction of foreign matter than the restriction effect of the 2nd restriction.

In above-mentioned expansion valve, preferably be provided with connecting portion in the downstream of described the 2nd spool portion of described spool, the diameter of described connecting portion is littler than the diameter of the maximum peripheral part of described the 2nd spool portion.In this case, can make the flow velocity reduction that flows to the cold-producing medium of pipe arrangement from the 2nd restriction, disorderly thereby cold-producing medium stream can not produce near the outlet port.

In above-mentioned expansion valve, preferably on described spool, between described connecting portion and described the 2nd spool portion, be formed with the 2nd reducing junction surface, described the 2nd reducing junction surface forms cone-shaped from described maximum peripheral part towards described connecting portion.In this case, the cold-producing medium stream after the 2nd restriction is carried out rectification can not produce disorder, thus, can further reduce the abnormal sound of being given birth to by the cold-producing medium miscarriage.

In above-mentioned expansion valve, preferably between the end of downstream side of the upstream-side-end of described the 2nd spool portion and described the 1st spool portion, be formed with from the 1st reducing junction surface of the 2nd spool portion towards the tapered shape of described the 1st spool portion, the angle of taper at described the 1st reducing junction surface is bigger than the angle of taper of described the 1st spool portion.In this case, can easily the 1st and the 2nd valve opening be formed the diameter that is fit to separately.

In above-mentioned expansion valve, preferred described the 2nd spool portion passes through after forming described helicla flute on the outer peripheral face of described bar-like member, the top of cutting this spiral fluted ridge, thus form cone-shaped towards the front end of described spool.In this case, when reducing the aperture of the 2nd restriction, the sectional area of helical form path also reduces.Thereby, regulate the aperture of the 2nd restriction by spiral fluted length and spiral fluted sectional area.

In above-mentioned expansion valve, preferred described the 2nd spool portion by with the outer peripheral face of described bar-like member after the front end of described spool forms cone-shaped, the described helicla flute of processing on its outer peripheral face and forming.In this case, make the face at the top that connects the spiral fluted ridge become taper surface easily.

In above-mentioned expansion valve, preferred described helicla flute is made of a plurality of helicla flutes.In this case, the cold-producing medium that sprays from the 1st restriction is dispersed in a plurality of helical form paths, thereupon, the kinergety of cold-producing medium stream is disperseed.And, owing to the flow velocity change of the cold-producing medium that flows out from each helical form path is different respectively with pressure oscillation, so, the cold-producing medium that flows out from each helical form path collides mutually, can eliminate the flow velocity change and the pressure oscillation of cold-producing medium, therefore, can suppress effectively by the living abnormal sound of cold-producing medium miscarriage.

In above-mentioned expansion valve, preferred described valve seat is make described the 1st valve opening outstanding and formation from the wall in described the 1st next door on every side.In this case, owing to around the 1st valve opening, promote the generation of vortex, the kinergety that flows from the cold-producing medium of the 1st restriction ejection is further consumed.Thereby, can relax the flow velocity change and the pressure oscillation of the cold-producing medium that flows to the 2nd restriction more.

In above-mentioned expansion valve, preferred described groove is upwardly extending a plurality of straight-line grooves in the advance and retreat side of described spool, described the 2nd restriction by this linearity groove and and the right face of this linearity groove face between the path of a plurality of independently linearities of forming constitute.In this case, the cold-producing medium that sprays from the 1st restriction is dispersed in each path of linearity, thereupon, the kinergety of cold-producing medium stream is disperseed.And, because the flow velocity change and the pressure oscillation of the cold-producing medium that flows out from the path of each linearity are distinguished different, so, the cold-producing medium that flows out from each linearity path collides mutually, can eliminate the flow velocity change and the pressure oscillation of cold-producing medium, thus, can suppress effectively by the living abnormal sound of cold-producing medium miscarriage.

And,, can make the length variations of repeating part of the outer peripheral face of the inner peripheral surface of groove and the 2nd valve opening or the 2nd spool portion by making spool advance and retreat.Thus, can make at the circulating resistance of the cold-producing medium of the 1st restriction with at the circulating resistance of the cold-producing medium of the 2nd restriction and change simultaneously.Thereby in the 1st restriction and the 2nd restriction, the ratio of the circulating resistance of cold-producing medium remains in the suitable scope, therefore can stably be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

In above-mentioned expansion valve, preferred described each straight-line groove equally spaced forms.In this case, because flowing, cold-producing medium is scattered in equably in each straight-line groove, so can bring into play the dispersion effect of the energy of cold-producing medium to greatest extent.

In order to solve above-mentioned problem, according to a second aspect of the invention, refrigerating plant has above-mentioned expansion valve.In this case, can realize reducing the refrigerating plant of the generation of the abnormal sound that causes by cold-producing medium stream.

According to a third aspect of the invention we, expansion valve has: valve body; Be formed on the cold-producing medium circulation flow path in the described valve body; Be accommodated in the spool that constitutes by bar-like member in the described valve body; Be formed on the 1st restriction on the described cold-producing medium circulation flow path; And the 2nd restriction that on described cold-producing medium circulation flow path, is formed on the upstream side of described the 1st restriction, described valve body has the 1st next door of the cold-producing medium stream that separates in the described cold-producing medium circulation flow path, the 2nd next door with the cold-producing medium of the upstream side that separates described the 1st next door stream, on described the 1st next door, be formed with the 1st valve opening, on described the 2nd next door, be formed with the 2nd valve opening, the outer peripheral face of described spool forms cone-shaped, described spool have can with the 1st spool portion of the valve seat butt of described the 1st valve opening, with the 2nd spool portion that faces mutually with the inner peripheral surface of described the 2nd valve opening, can change the aperture of described the 1st restriction by described the 1st spool portion is advanced and retreat with respect to described the 1st valve opening, described the 2nd restriction is made of spiral helicine path, this spiral helicine path is formed between the inner peripheral surface of the outer peripheral face of helicla flute that forms on the inner peripheral surface of the outer peripheral face of described the 2nd spool portion or described the 2nd valve opening and described the 2nd spool portion or described the 2nd valve opening, and at least one side in the inner peripheral surface of the outer peripheral face of described the 2nd spool portion and described the 2nd valve opening forms cone-shaped towards the front end of described spool.

By as above constituting, when producing slug flow or plug flow near the inlet at expansion valve, make it pass through the 2nd restriction, carry out the segmentation of bubble thus, make the cold-producing medium stream serialization that flows to the 1st restriction.And the length of spiral helicine path that constitutes the 2nd restriction is longer, therefore can suppress the pressure oscillation that caused by biphase gas and liquid flow, and with the bubble segmentation in the cold-producing medium stream.The effect that multiplies each other of the segmentation by such bubble and the inhibition of pressure oscillation flows to the cold-producing medium stream serialization of the 1st restriction from the 2nd restriction.And, circulate linearly to the 1st restriction from the 2nd restriction by making cold-producing medium, can further reduce the pressure oscillation in the 1st restriction.Consequently, can be reduced near the 1st restriction, by the living abnormal sound of cold-producing medium miscarriage.

And at least one side of the inner peripheral surface of the outer peripheral face of the 2nd spool portion and the 2nd valve opening is a taper surface.Therefore, when the aperture of the 1st restriction reduced, the aperture of the 2nd restriction also reduced, the foreign matter of nipping easily, and on the other hand, when the aperture of the 1st restriction increased, the aperture of the 2nd restriction also increased, thereby can easily wash away the foreign matter of being nipped by cold-producing medium.Thus, can avoid the obstruction of foreign matter, so can not produce problems such as the action of spool is bad.

In above-mentioned expansion valve, but preferred described the 1st restriction is advanced and retreat and full cut-off with respect to described the 1st valve opening by making described the 1st spool portion.In this case, but because the 1st restriction full cut-off, so can fully guarantee to make the needed amount of restriction of the 1st restriction full cut-off.

In above-mentioned expansion valve, the outer peripheral face of preferred described the 2nd spool portion and the inner peripheral surface of described the 2nd valve opening all form cone-shaped towards the front end of described spool.In this case, when increasing the aperture of the 2nd restriction, the variable quantity with the gap between a side the face of groove and the opposing party's of facing mutually with this face the face reduces.Therefore, can make the path that constitutes the 2nd restriction effectively to cold-producing medium generation effect, and irrelevant with the aperture of the 2nd restriction.Thereby,, also can give full play to the flow velocity change of inhibition cold-producing medium and the effect of pressure oscillation even increase the aperture of the 2nd restriction.

In above-mentioned expansion valve, the outer peripheral face of preferred described the 2nd spool portion is identical with the angle of taper of the inner peripheral surface of described the 2nd valve opening.In this case, because big variation can not take place because of the aperture of valve in the sectional area of spiral helicine path, so can play consistently effect with the bubble segmentation.

In above-mentioned expansion valve, preferred described helicla flute is formed on the outer peripheral face of described the 2nd spool portion.In this case, the processing of groove becomes easy.

In above-mentioned expansion valve, preferred described spool has described the 1st spool portion at leading section, has described the 2nd spool portion at pars intermedia.In this case, because the external diameter of the 2nd spool portion becomes big, so can relax restriction in the design of the total length of groove and the quantity of groove etc.Therefore, can further relax the flow velocity change and the pressure oscillation of the cold-producing medium in the 2nd restriction.

In above-mentioned expansion valve, preferably from described the 2nd restriction to the refrigerant passage of described the 1st valve opening, near the inlet of described the 1st valve opening, be formed with the amplification spatial portion.In this case, in amplifying spatial portion, give birth to vortex by the miscarriage of the cold-producing medium after the 1st restriction.Like this,, consume the kinergety of cold-producing medium stream, thereby can further relax the flow velocity change and the pressure oscillation of cold-producing medium by the generation of vortex.

In above-mentioned expansion valve, preferred described spool has described the 1st spool portion at leading section, has described the 2nd spool portion at pars intermedia, the inner peripheral surface of the outer peripheral face of described the 2nd spool portion and the 2nd valve opening forms cone-shaped towards the front end of described spool, and the upstream-side-end of described the 2nd spool portion is configured in described the 2nd valve opening in from minimum of a value to peaked scope in the aperture of described the 2nd restriction.In this case, can avoid the cold-producing medium miscarriage after the 2nd restriction is carried out rectification to give birth to unnecessary disorder.

In above-mentioned expansion valve, preferred the 1st spool portion is formed on the leading section of described spool, the 2nd spool portion is formed on the pars intermedia of described spool, the inner peripheral surface of the outer peripheral face of described the 2nd spool portion and described the 2nd valve opening forms cone-shaped towards the front end of described spool, from the refrigerant passage of described the 2nd restriction to the 1 valve opening, be formed with the amplification spatial portion near the inlet of described the 1st valve opening, the end of downstream side of described the 2nd spool portion is configured in the described amplification spatial portion in from minimum of a value to peaked scope in the aperture of described the 2nd restriction.In this case, in amplifying spatial portion, can make by the miscarriage of the cold-producing medium after the 1st restriction and give birth to vortex.Thereby, can make the kinergety consumption of cold-producing medium stream effectively, can further relax the flow velocity change and the pressure oscillation of cold-producing medium.

In above-mentioned expansion valve, preferred described helicla flute is formed on the outer peripheral face of described the 2nd spool portion.In this case, spiral fluted processing becomes easy.

In above-mentioned expansion valve, preferred described the 2nd spool portion is identical with the angle of taper of described the 2nd valve opening.In this case, when increasing the aperture of the 2nd restriction, the variable quantity with the gap between a side the face of groove and the opposing party's of facing mutually with this face the face reduces.Thereby, can make the helical form path that constitutes the 2nd restriction effectively to cold-producing medium generation effect, and irrelevant with the aperture of the 2nd restriction.

In above-mentioned expansion valve, the angle of taper of preferred described the 1st spool portion is bigger than the angle of taper of described the 2nd valve opening.In this case, follow the spool advance and retreat, the restriction effect of the 1st restriction is changed than the 2nd restriction biglyyer.

In above-mentioned expansion valve, the angle of taper of the taper surface of preferred described the 2nd valve opening is in the scope of 5 degree～60 degree.In this case, when the 2nd restriction standard-sized sheet, can remove the foreign matter in the gap between the inner peripheral surface of nip spiral fluted ridge and the 2nd valve opening.

In above-mentioned expansion valve, preferably the gap between near described the 1st spool portion that forms the inlet of described the 1st restriction and the 1st valve opening is littler than the minimum of a value in described the 2nd spool portion that forms in described the 2nd restriction and the gap between described the 2nd valve opening.In this case, can make the restriction effect of the 1st restriction bigger, and also can suppress the obstruction of foreign matter than the 2nd restriction.

In above-mentioned expansion valve, preferably the upstream side in described the 2nd spool portion of described spool is provided with connecting portion, and the diameter of this connecting portion is littler than the diameter of the maximum peripheral part of described the 2nd spool portion.In this case, can reduce the flow velocity that flows to the cold-producing medium of pipe arrangement from the 2nd restriction, thereby cold-producing medium stream can not produce unnecessary disorder near ingress port.

In above-mentioned expansion valve, preferably between described connecting portion and described the 2nd spool portion, be formed with the 2nd reducing junction surface, the 2nd reducing junction surface forms conical in shape from the maximum peripheral part of the 2nd spool portion towards the peripheral part of described connecting portion.In this case, the cold-producing medium after the 2nd restriction is carried out rectification is difficult for producing disorderly, can further reduce the abnormal sound of being given birth to by the cold-producing medium miscarriage.

In above-mentioned expansion valve, preferably between the upstream-side-end of the end of downstream side of described the 2nd spool portion and described the 1st spool portion, be formed with from the 1st reducing junction surface of the 2nd spool portion towards the tapered shape of described the 1st spool portion, the angle of taper at described the 1st reducing junction surface is bigger than the angle of taper of described the 1st spool portion.In this case, can easily the 1st and the 2nd valve opening be formed the diameter that is fit to separately.

In above-mentioned expansion valve, following such formation of preferred described helicla flute: at outer peripheral face or the inner peripheral surface of the 2nd valve opening and the laggard capable chasing of central axes ground formation of described spool with described the 2nd spool portion, and then, the top of screw cutting tooth, the face that is thus connected described ridge top becomes taper surface.In this case, when reducing the aperture of the 2nd restriction, the sectional area of helical form path also reduces.Thereby, also can regulate the aperture of the 2nd restriction by spiral fluted length and spiral fluted sectional area.

In above-mentioned expansion valve, preferred described helicla flute forms cone-shaped by the outer peripheral face with described spool, and its machined surface chasing is formed.In this case, make the face that connects spiral fluted ridge top become taper surface easily.

In above-mentioned expansion valve, preferred described valve seat is make described the 1st valve opening outstanding and formation from the wall portion in described the 1st next door on every side.In this case, the cold-producing medium that sprays from the 1st restriction is dispersed in a plurality of helical form paths, thereupon, the kinergety of cold-producing medium stream is disperseed.And, owing to the flow velocity change of the cold-producing medium that flows out from each helical form path is different respectively with pressure oscillation, so, the cold-producing medium that flows out from each helical form path collides mutually, can eliminate the flow velocity change and the pressure oscillation of cold-producing medium, thus, can suppress effectively by the living abnormal sound of cold-producing medium miscarriage.

In above-mentioned expansion valve, preferred described helicla flute is made of a plurality of helicla flutes.In this case, cold-producing medium stream is disorderly, and bubble is further segmented, so can further reduce the abnormal sound of being given birth to by the cold-producing medium miscarriage.And, in the helicla flute of a part, having stopped up under the situation of foreign matter, cold-producing medium is by other helicla flute circulation, so can improve the reliability of stopping up at foreign matter.

In order to solve above-mentioned problem, according to a forth aspect of the invention, refrigerating plant has above-mentioned expansion valve.In this case, can realize reducing the refrigerating plant of the generation of the abnormal sound that causes by cold-producing medium stream.

Description of drawings

Fig. 1 is the part sectioned view of the expansion valve of the present invention's the 1st embodiment.

Fig. 2 is the part sectioned view of the expansion valve of the present invention's the 2nd embodiment.

Fig. 3 is the part sectioned view of the expansion valve of the present invention's the 3rd embodiment.

Fig. 4 is the part sectioned view of the expansion valve of the present invention's the 4th embodiment.

Fig. 5 is the part sectioned view of the expansion valve of the present invention's the 5th embodiment.

Fig. 6 is the part sectioned view of the expansion valve of the present invention's the 6th embodiment.

Fig. 7 is the part sectioned view of the expansion valve of the present invention's the 7th embodiment.

Fig. 8 is the part sectioned view of the expansion valve of the present invention's the 8th embodiment.

Fig. 9 is the part sectioned view of the expansion valve of the present invention's the 9th embodiment.

Figure 10 is the part sectioned view of the expansion valve of the present invention's the 10th embodiment.

Figure 11 is the part sectioned view of the expansion valve of the present invention's the 11st embodiment.

Figure 12 is the part sectioned view of the expansion valve of the present invention's the 12nd embodiment.

Figure 13 is the profile along the 13-13 line of Figure 12.

Figure 14 is the part sectioned view of the expansion valve of the present invention's the 13rd embodiment.

Figure 15 is the profile along the 15-15 line of Figure 14.

Figure 16 is the part sectioned view of the expansion valve of the present invention's the 14th embodiment.

Figure 17 is the profile along the 17-17 line of Figure 16.

Figure 18 is the part sectioned view of the expansion valve of the present invention's the 15th embodiment.

Figure 19 is the part sectioned view of the expansion valve of the present invention's the 16th embodiment.

Figure 20 is that the aperture of the expansion valve of expression the present invention the 17th embodiment is the part sectioned view of minimum state.

Figure 21 is that the aperture of the expansion valve of expression the present invention the 17th embodiment is the part sectioned view of maximum rating.

Figure 22 is the local amplification profile of the expansion valve of the present invention's the 17th embodiment.

Figure 23 is a block diagram of representing the refrigerant loop of separate type air conditioner in the past.

Figure 24 is a part sectioned view of schematically representing the expansion valve of refrigerant loop.

The specific embodiment

(the 1st embodiment)

Below, the expansion valve of the 1st embodiment of the present invention is described with reference to Fig. 1.

As shown in Figure 1, expansion valve has valve body 1, is formed with ingress port 1a and outlet port 1b on valve body 1.Valve body 1 is the general cylindrical shape shape, and portion is formed with valve chamber 2 and cold-producing medium circulation flow path 3 within it.And in valve body 1, ingress port 1a and outlet port 1b are communicated with via valve chamber 2 and cold-producing medium circulation flow path 3.In valve chamber 2, taken in spool 4, be provided with the 1st restriction 5, be provided with the 2nd restriction 6 in the downstream at the upstream side of cold-producing medium circulation flow path 3.On ingress port 1a, be connected with the liquid pipe 7 of junction chamber exterior loop and expansion valve, on outlet port 1b, be connected with the pipe arrangement 8 that connects expansion valve and indoor coil.In the present embodiment, be provided with ingress port 1a in the bottom of valve body 1, be provided with outlet port 1b at the sidewall of valve body 1, cold-producing medium is mobile valve body 1 in along the direction of arrow shown in the solid line of Fig. 1.

In valve body 1, on the position corresponding, be formed with the 1st next door 10 with the 1st restriction 5, on the position corresponding, be formed with the 2nd next door 11 with the 2nd restriction 6.All extend along flowing the direction of intersecting with cold-producing medium in the 1st and the 2nd next door 10,11.And, on the 1st next door 10, be formed with the 1st valve opening 12, on the 2nd next door 11, be formed with diameter 2nd valve opening 13 bigger than the diameter of the 1st valve opening 12.Cold-producing medium circulation flow path 3 from the 2nd next door 11 (the 2nd valve opening 13) (the 1st valve opening 12) forms taper (shape of テ-パ) towards the 1st next door 10.

Spool 4 has roughly columned connecting portion 14 on top, have the 2nd spool portion 16 at pars intermedia, has roughly cone shape the 1st spool portion 15 in the bottom.Spool 4 and valve body 1 arranged coaxial, and be supported to and can move in vertical direction.Spool 4 drives with pulse motor (not shown) via connecting portion 14 and is connected.The 1st spool portion 15 forms conical in shape towards its front end.By making the valve seat 12a advance and retreat of spool 4, change the aperture (amount of restriction) that is formed at the 1st restriction 5 between the 1st spool portion 15 and the valve seat 12a with respect to the 1st valve opening 12.

On the outer peripheral face of the 2nd spool portion 16, be formed with spiral helicine groove.This helicla flute 17 is by forming the 2nd spool portion 16 being formed the coniform back outer peripheral face chasing to the 2nd spool portion 16.Therefore, the outer peripheral face of residing the 2nd spool portion 16 of the ridge of helicla flute 17 is taper surfaces.The angle of taper of the outer peripheral face of the 2nd spool portion 16 is littler than the angle of taper of the outer peripheral face of the 1st spool portion 15.In the present embodiment, form the 2nd restriction 6 by the outer peripheral face of the 2nd spool portion 16, the inner peripheral surface and the helical form path 18 of the 2nd valve opening 13.The space that helical form path 18 is surrounded by the inner peripheral surface of the helicla flute 17 of the 2nd spool portion 16 and the 2nd valve opening 13.The angle of taper of the outer peripheral face of the 2nd spool portion 16 is identical with the angle of taper of the inner peripheral surface of the 2nd valve opening 13.In this case, the inner peripheral surface of the outer peripheral face of the 2nd spool portion 16 and the 2nd valve opening 13 is parallel to each other.

According to the 1st embodiment, can access following effect.

(1) after liquid refrigerant flows into from ingress port 1a, reduces pressure successively in the 1st restriction the 5, the 2nd restriction 6.Then, post-decompression cold-producing medium is discharged to pipe arrangement from outlet port 1b in the 2nd restriction 6.According to this structure, when near ingress port 1a, producing slug flow or plug flow etc., by the 1st restriction 5 and the 2nd restriction 6 of being located at its downstream, can suppress the decompression amount of the 1st restriction 5 less, thereby can reduce near the ejection energy of cold-producing medium the 1st restriction 5.And, carry out rectification by the 2nd restriction 6 by the stream of the cold-producing medium after the 1st restriction 5.Thus, the speed that flows to the cold-producing medium of pipe arrangement from the 2nd restriction 6 reduces, and the kinergety of cold-producing medium stream reduces.Thereby, can suppress the speed fluctuation and the pressure oscillation of cold-producing medium less, can further be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

(2) the 2nd restriction 6 are made of helical form path 18.In this case, because the total length of the 2nd restriction 6 is longer, so the kinergety of cold-producing medium stream is disappeared.Thereby the flow velocity change and the pressure oscillation of cold-producing medium are littler, can further be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

The inner peripheral surface of the outer peripheral face of (3) the 2nd spool portions 16 and the 2nd valve opening 13 all forms conical in shape towards the front end of spool 4.In this case, when the aperture of the 1st restriction 5 reduced, the gap of the 2nd spool portion 16 and the 2nd valve opening 13 also diminished, and foreign matter is nipped in this gap easily.But when the aperture of the 1st restriction 5 increased, this gap also increased, and therefore can wash away foreign matter by cold-producing medium.Like this, owing to can suppress the obstruction of foreign matter, so can avoid problems such as the action of spool 4 is bad.

(4) because the outer peripheral face of the 2nd spool portion 16 is parallel with the inner peripheral surface of the 2nd valve opening 13, so follow the variation of the aperture of the 2nd restriction 6, big variation can not take place in the gap between the 2nd spool portion 16 and the 2nd valve opening 13.Thereby, not only under the little situation of the aperture of the 2nd restriction 6, and under the situation that aperture increases, also can further reduce the speed fluctuation and the pressure oscillation of cold-producing medium mobile in helical form path 18.

(5) helicla flute 17 of formation helical form path 18 is formed at the outer peripheral face of the 2nd spool portion 16.In this case, can easily process helicla flute 17.And in this case, helicla flute 17 is to form cone-shaped and its taper surface chasing is formed by the front end with bar-like member.In this case, the processing of taper surface becomes easy.

(6) spool 4 has the 1st spool portion 15 at leading section, has the 2nd spool portion 16 at pars intermedia.Thus, can increase the external diameter of the 2nd spool portion 16, relax the restriction in the design of length, width, the degree of depth etc. of helicla flute 17.Thereby the design that constitutes the helicla flute 17 of the 2nd restriction 6 becomes easy.

(7) owing to do not use the such superfine path of A method in the past as restriction, so can avoid foreign matter to be blocked in restriction.And, but because the 1st restriction 5 full cut-offs, so can guarantee to make the needed amount of restriction of the 1st restriction 5 full cut-offs.

(8) cold-producing medium circulation flow path 3 is separated by the 1st and the 2nd next door 10,11, with respect to a spool 4 of the 1st and the 2nd valve opening 12,13 drivings in the 1st and the 2nd next door 10,11.And, between the 1st valve opening 12 and the 1st spool portion 15, form the 1st restriction 5, between the 2nd valve opening 13 and the 2nd spool portion 16, form the 2nd restriction 6 that comprises helical form path 18.In this case, for the expansion valve of the restriction with 2 level structures, its structure is simplified.

(the 2nd embodiment)

The 2nd embodiment of expansion valve of the present invention then, is described with reference to Fig. 2.In the expansion valve of the 2nd embodiment, reverse when cold-producing medium stream and the 1st embodiment.

As shown in Figure 2, expansion valve has valve body 21, is formed with ingress port 21a and outlet port 21b on valve body 21.Valve body 21 is the general cylindrical shape shape, and portion is formed with valve chamber 22 and cold-producing medium circulation flow path 23 within it.And in valve body 21, ingress port 21a and outlet port 21b are communicated with via valve chamber 22 and cold-producing medium circulation flow path 23.In valve chamber 22, taken in spool 24.Upstream side at cold-producing medium circulation flow path 23 is provided with the 1st restriction 25, is provided with the 2nd restriction 26 in the downstream.On ingress port 21a, be connected with the liquid pipe 27 of junction chamber exterior loop and expansion valve, on outlet port 21b, be connected with the pipe arrangement 28 that connects expansion valve and indoor coil.In the present embodiment, be provided with ingress port 21a at the sidewall of valve body 21, be provided with outlet port 21b in the bottom of valve body 21, cold-producing medium is mobile valve body 21 in along the direction of arrow shown in the solid line of Fig. 2.

And, in valve body 21, on the position corresponding, be formed with the 1st next door 30 with the 1st restriction 25, on the position corresponding, be formed with the 2nd next door 31 with the 2nd restriction 26.All extend along flowing the direction of intersecting with cold-producing medium in the 1st and the 2nd next door 30,31.And, on the 2nd next door 31, be formed with the 2nd valve opening 33, on the 1st next door 30, be formed with diameter 1st valve opening 32 bigger than the diameter of the 2nd valve opening 33.The inner peripheral surface of the 2nd valve opening 33 forms conical in shape towards outlet port 21b.

Spool 24 has connecting portion 34 on top, have the 1st spool portion 35 at pars intermedia, has the 2nd spool portion 36 in the bottom.Spool 24 and valve body 21 arranged coaxial, and be supported to and can move in vertical direction.Spool 24 drives with pulse motor (not shown) via connecting portion 34 and is connected.The 1st spool portion 35 forms conical in shape towards its front end.By making spool 24, thereby change the aperture (amount of restriction) that is formed at the 1st restriction 25 between the 1st spool portion 35 and the valve seat 32a with respect to the valve seat 32a of the 1st valve opening 32 advance and retreat.

On the outer peripheral face of the 2nd spool portion 36, be formed with spiral helicine groove.This helicla flute 37 forms by the taper surface chasing to the 2nd spool portion 36 after the 2nd spool portion 36 is formed cone shape.The angle of taper of the outer peripheral face of the 2nd spool portion 36 is littler than the angle of taper of the outer peripheral face of the 1st spool portion 35.In the present embodiment, form the 2nd restriction 26 by the outer peripheral face of the 2nd spool portion 36, the inner peripheral surface and the helical form path 38 of the 2nd valve opening 33.The space that helical form path 38 is surrounded by the inner peripheral surface of the helicla flute 37 of the 2nd spool portion 36 and the 2nd valve opening 33.The angle of taper of the outer peripheral face of the 2nd spool portion 36 is identical with the angle of taper of the inner peripheral surface of the 2nd valve opening 33.In this case, the inner peripheral surface of the outer peripheral face of the 2nd spool portion 36 and the 2nd valve opening 33 is parallel to each other.

According to the 2nd embodiment, can access following effect.

(1) after liquid refrigerant flows into from ingress port 21a, reduces pressure successively in the 1st restriction the 25, the 2nd restriction 26.Then, post-decompression cold-producing medium is discharged to pipe arrangement from outlet port 21b in the 2nd restriction 26.According to this structure, when near ingress port 21a, producing slug flow or plug flow etc., by the 1st restriction 25 and the 2nd restriction 26 of being located at its downstream, can suppress the decompression amount in the 1st restriction 25 lower, thereby can reduce near the ejection energy of cold-producing medium the 1st restriction 25.And, carry out rectification by the 2nd restriction 26 by the cold-producing medium after the 1st restriction 25.Thus, the speed that flows to the cold-producing medium of pipe arrangement from the 2nd restriction 26 reduces, and the kinergety of cold-producing medium stream reduces.Thereby the speed fluctuation of cold-producing medium and pressure oscillation are suppressed lessly, can be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

(2) the 2nd restriction 26 are made of helical form path 38.In this case, because the total length of the 2nd restriction 26 is longer, so the kinergety of cold-producing medium stream is disappeared.Thereby the flow velocity change and the pressure oscillation of cold-producing medium are littler, can further be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

The inner peripheral surface of the outer peripheral face of (3) the 2nd spool portions 36 and the 2nd valve opening 33 all forms conical in shape towards the front end of spool 24.In this case, when the aperture of the 1st restriction 25 reduced, the gap between the 2nd spool portion 36 and the 2nd valve opening 33 also reduced, and foreign matter is nipped in this gap easily.But when the aperture of the 1st restriction 25 increased, this gap also increased, and therefore can easily wash away foreign matter by cold-producing medium.Like this, owing to can suppress foreign matter and be blocked in the gap, so can avoid the action of spool 24 bad etc.

(4) because the outer peripheral face of the 2nd spool portion 36 is parallel with the inner peripheral surface of the 2nd valve opening 33, so follow the variation of the aperture of the 2nd restriction 26, big variation can not take place in the gap between the 2nd spool portion 36 and the 2nd valve opening 33.Thereby, not only under the little situation of the aperture of the 2nd restriction 26, and under aperture becomes big situation, also can further reduce the speed fluctuation and the pressure oscillation of the cold-producing medium that in helical form path 38, flows.

(5) helicla flute 37 is formed on the outer peripheral face of the 2nd spool portion 36.And helicla flute 37 is to form cone-shaped and its taper surface chasing is formed by the front end with bar-like member.Like this, the processing of taper surface becomes easy.

(6) owing to do not use the such superfine path of A method in the past as restriction, so can avoid foreign matter to be blocked in restriction.And, but because the 1st restriction 25 full cut-offs, so can guarantee to make the needed amount of restriction of the 1st restriction 25 full cut-offs.

(7) cold-producing medium circulation flow path 23 is separated by the 1st and the 2nd next door 30,31, with respect to the 1st valve opening 32 and a spool 24 of the 2nd valve opening 33 drivings in the 1st and the 2nd next door 30,31.Thus, between the 1st valve opening 32 and the 1st spool portion 35, form the 1st restriction 25, between the 2nd valve opening 33 and the 2nd spool portion 36, form the 2nd restriction 26 that comprises helical form path 38.In this case, for the expansion valve of the restriction with 2 level structures, its structure is simplified.

(the 3rd embodiment)

The 3rd embodiment of expansion valve of the present invention then, is described with reference to Fig. 3.In addition, for part identical in the 3rd embodiment, omit its detailed description with the 1st embodiment.

As shown in Figure 3, in cold-producing medium circulation flow path 3, between the 1st valve opening 12 and the 2nd restriction 6, be formed with and amplify spatial portion 41.In amplifying spatial portion 41, the internal diameter of cold-producing medium circulation flow path 3 is locally expanded.According to this structure,, the kinergety of cold-producing medium stream is disappeared owing in amplifying spatial portion 41, give birth to vortex by the miscarriage of the cold-producing medium after the 1st restriction 5.Thereby the speed fluctuation and the pressure oscillation of cold-producing medium stream further reduce, and can further be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

(the 4th embodiment)

The 4th embodiment of expansion valve of the present invention then, is described with reference to Fig. 4.In addition, for part identical in the 4th embodiment, omit its detailed description with the 3rd embodiment.

As shown in Figure 4, the front end in the 1st spool portion 15 is formed with the 1st tapered portion 15a.And, in the 1st spool portion 15, be formed with the 2nd tapered portion 15b at the base end side of the 1st tapered portion 15a.The angle of taper of the 1st tapered portion 15a is littler than the angle of taper of the 2nd tapered portion 15b.In the present embodiment, the taper face that is made of two tapered portion 15a, 15b constitutes guide portion.According to this structure,, amplifying spatial portion 41 intrinsic deflections (dotted arrow shown in Figure 4) by the stream of the cold-producing medium behind the 1st valve opening 12 by means of this guide portion.In this case, in amplifying spatial portion 41,, the kinergety by the stream of the cold-producing medium after the 1st restriction 5 is disappeared owing to can promote the generation of vortex.Thus, the kinergety, speed fluctuation and the pressure oscillation that flow to the cold-producing medium stream of pipe arrangement from the 2nd restriction 6 further reduce, thereby can further be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

(the 5th embodiment)

The 5th embodiment of expansion valve of the present invention then, is described with reference to Fig. 5.In addition, for part identical in the 5th embodiment, omit its detailed description with the 1st embodiment.

As shown in Figure 5, being provided with the wall that makes the 1st next door 10 around the 1st valve opening 12 gives prominence to and the valve seat 43 of formation upward.And, between the wall of valve seat 43 and cold-producing medium circulation flow path 3, be formed with vortex and form space 44.According to this structure, owing to form in the space 44, produce vortex, so the kinergety of cold-producing medium stream is disappeared by the cold-producing medium after the 1st restriction 5 at vortex.Thereby the kinergety, speed fluctuation and the pressure oscillation that flow to the cold-producing medium stream of pipe arrangement from the 2nd restriction 6 further reduce.Therefore, can further be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

(the 6th embodiment)

The 6th embodiment of expansion valve of the present invention then, is described with reference to Fig. 6.In addition, for part identical in the 6th embodiment, omit its detailed description with the 1st embodiment.

As shown in Figure 6, the outer peripheral face of the 2nd spool portion 46 is level and smooth taper surfaces, on the other hand, is formed with helicla flute 48 at the inner peripheral surface of the 2nd valve opening 47.In this case, the space that is surrounded by the outer peripheral face of helicla flute 48 and the 2nd spool portion 46 forms helical form path 49.According to this structure, can bring into play the action effect same with the 1st embodiment.

(the 7th embodiment)

The 7th embodiment of expansion valve of the present invention then, is described with reference to Fig. 7.In addition, for part identical in the 7th embodiment, omit its detailed description with the 2nd embodiment.

As shown in Figure 7, the outer peripheral face of the 2nd spool portion 51 is level and smooth taper surfaces, on the other hand, is formed with helicla flute 53 at the inner peripheral surface of the 2nd valve opening 52.In this case, the space that is surrounded by the outer peripheral face of helicla flute 53 and the 2nd spool portion 51 forms helical form path 54.According to this structure, can bring into play the action effect same with the 2nd embodiment.

(the 8th embodiment)

The 8th embodiment of expansion valve of the present invention then, is described with reference to Fig. 8.In addition, for part identical in the 8th embodiment, omit its detailed description with the 1st embodiment.

As shown in Figure 8, in the 2nd spool portion 56, be formed with helicla flute 55.Helicla flute 55 at first forms the outer peripheral face of the 2nd spool portion 56 abreast with the center line of spool 4.Then, behind outer peripheral face chasing, form the top that the mode of cone-shaped is cut the ridge of helicla flute 55 towards the front end of spool 4 with the outer peripheral face of the 2nd spool portion 56 to the 2nd spool portion 56.In this case, the outer peripheral face of the 2nd spool portion 56 is the faces at top that connect the ridge of helicla flute 57, becomes taper surface.Form helical form path 57 between helicla flute 55 and the 2nd valve opening 13, its area of section is along with reducing towards the front end of spool 4.According to this structure, when the aperture of the 2nd restriction 6 reduced, the area of section of helical form path 57 also reduced.In this case, the sectional area of length by helicla flute 55 and helicla flute 55 is regulated the aperture (amount of restriction) of the 2nd restriction 6.

(the 9th embodiment)

The 9th embodiment of expansion valve of the present invention then, is described with reference to Fig. 9.In addition, for part identical in the 9th embodiment, omit its detailed description with the 2nd embodiment.

As shown in Figure 9, in the 2nd spool portion 62, be formed with helicla flute 61.When forming helicla flute 61, at first form the outer peripheral face of the 2nd spool portion 62 abreast with the center line of spool 24.Then, behind outer peripheral face chasing, form the top that the mode of cone-shaped is cut the ridge of helicla flute 61 towards the front end of spool 24 with the outer peripheral face of the 2nd spool portion 62 to the 2nd spool portion 62.In this case, the outer peripheral face of the 2nd spool portion 62 is the faces at top that connect the ridge of helicla flute 61, becomes taper surface.Be formed with helical form path 63 between the inner peripheral surface of helicla flute 61 and the 2nd valve opening 33, its sectional area is along with towards the leading section of spool 24 and reduce.According to this structure, when the aperture of the 2nd restriction 26 reduced, thereupon, the sectional area of helical form path 63 also reduced.In this case, the sectional area of length by helicla flute 61 and helicla flute 61 is regulated the aperture (amount of restriction) of the 2nd restriction 26.

(the 10th embodiment)

The 10th embodiment of expansion valve of the present invention then, is described with reference to Figure 10.In addition, for part identical in the 10th embodiment, omit its detailed description with the 1st embodiment.

As shown in figure 10, the inner peripheral surface of the 2nd valve opening 65 forms parallel with the center line of spool 4.And, between the inner peripheral surface of the outer peripheral face of the 2nd spool portion 16 and the 2nd valve opening 65, be formed with helical form path 66.According to this structure, when the aperture of the 1st restriction 5 reduces and the aperture of the 2nd restriction 6 when reducing, the gap between the inner peripheral surface of the outer peripheral face of the 2nd spool portion 16 and the 2nd valve opening 65 also reduces, so foreign matter is nipped in this gap easily.But when the aperture of the 1st restriction 5 increases and the aperture of the 2nd restriction 6 when increasing, the foreign matter of nipping cooled dose of stream easily washes away.

(the 11st embodiment)

The 11st embodiment of expansion valve of the present invention then, is described with reference to Figure 11.In addition, for part identical in the 11st embodiment, omit its detailed description with the 1st embodiment.

As shown in figure 11, the outer peripheral face of the 2nd spool portion 68 forms parallel with the center line of spool 4.And, on the outer peripheral face of the 2nd spool portion 68, be formed with helicla flute 67.Helicla flute 67 is by after forming abreast at the center line with the outer peripheral face of the 2nd spool portion 68 and spool 4, to the outer peripheral face chasing of the 2nd spool portion 68 and form.Between the inner peripheral surface of helicla flute 67 and the 2nd valve opening 13, form helical form path 69.According to this structure, aperture that can be by the 1st and the 2nd restriction 5,6 changes the size in the gap between the inner peripheral surface of the 2nd spool portion 68 and the 2nd valve opening 13.Thereby when the aperture of the 1st and the 2nd restriction 5,6 increased, this gap also increased, and therefore can easily wash away foreign matter by cold-producing medium.Like this, owing to can suppress the obstruction of foreign matter, so can avoid problems such as the action of spool 4 is bad.

(the 12nd embodiment)

The 12nd embodiment of expansion valve of the present invention then, is described with reference to Figure 12 and Figure 13.In addition, for part identical in the 12nd embodiment, omit its detailed description with the 1st embodiment.

As Figure 12 and shown in Figure 13, the 2nd spool portion 71 forms cone-shaped from the pars intermedia of spool 4 towards front end.On the inner peripheral surface of the 2nd valve opening 13, equally spaced be formed with 4 linearity grooves 72 that extend along the axis of spool 4.Each linearity groove 72 all has the triangular-section of same shape and same size.And the internal diameter of the 2nd valve opening 13 is set to, and when the amount of restriction of the 2nd restriction 6 was maximum, the 2nd spool portion 71 and the 2nd valve opening 13 be size slidably.Thus, between linearity groove 72 and the 2nd spool portion 71, be formed with a plurality of refrigerant passage that constitute the 2nd restriction 6 respectively independently.In this case, slide in the axial direction, change the amount of restriction of the 1st restriction 5, and change the length of the repeating part (linearity path 73) of linearity groove 72 and the 2nd spool portion 71 by making spool 4.At this moment, the circulating resistance of the cold-producing medium by the 1st restriction 5 and the 2nd restriction 6 changes respectively simultaneously.

According to the 12nd embodiment, can access following effect.

(1) under the situation that slug flow or plug flow flow into from ingress port 1a, by the 1st restriction 5 be positioned at the 2nd restriction 6 in its downstream, reduce the decompression amount of the 1st restriction 5, reduce from the ejection energy of the cold-producing medium of the 1st restriction 5 ejections.And then the cold-producing medium that sprays from the 1st restriction 5 is dispersed in a plurality of linearity paths 73, and thereupon, the kinergety of cold-producing medium stream is also disperseed.And owing to become turbulent flow by the cold-producing medium behind each linearity path 73, change of the flow velocity of cold-producing medium and pressure oscillation further relax.And the flow velocity change and the pressure oscillation of the cold-producing medium that flows out from each linearity path 73 are distinguished different.Therefore, the cold-producing medium that flows out from each linearity path 73 collides mutually, and thus, change of the flow velocity of cold-producing medium and pressure oscillation reduce effectively.Therefore, the kinergety, speed fluctuation and the pressure oscillation that flow to the cold-producing medium stream of pipe arrangement from the 2nd restriction 6 further reduce, thereby can further be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

(2) by making spool 4 advance and retreat, can make the length variations of repeating part of the inner peripheral surface of each linearity groove 72 and the 2nd valve opening 13, in the 1st restriction 5 and the 2nd restriction 6, can make the circulating resistance variation of cold-producing medium respectively simultaneously.Thus, in the 1st restriction 5 and the 2nd restriction 6, the ratio of the circulating resistance of cold-producing medium remains in the suitable scope, thereby can stably be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

The inner peripheral surface of the outer peripheral face of (3) the 2nd spool portions 71 and the 2nd valve opening 13 forms cone-shaped towards the front end of spool 4.Thus, foreign matter is difficult in the gap of inner peripheral surface of the outer peripheral face of the 2nd spool portion 71 that is blocked in and the 2nd valve opening 13, therefore can avoid problems such as the action of spool 4 is bad.

(4) since the outer peripheral face of the 2nd spool portion 71 be parallel to each other with the inner peripheral surface of the 2nd valve opening 13, so can irrespectively change and pressure oscillation with the aperture of the 2nd restriction 6 by the flow velocity that linearity path 73 relax cold-producing medium effectively.

(5) because each linearity groove 72 equally spaced forms,, the kinergety of cold-producing medium stream is more effectively disperseed so cold-producing medium is evenly dispersed in each linearity path 73.

(6) owing to the leading section at spool 4 is formed with the 1st spool portion 15, be formed with the 2nd spool portion 71 at pars intermedia, so, the external diameter of the 2nd spool portion 71 and the internal diameter of the 2nd valve opening 13 can be increased respectively.Thus, relax restriction in the design of length, width or the degree of depth etc. of linearity groove 72.Thereby, be used to relax the flow velocity change of the cold-producing medium by the 2nd restriction 6 and the design of pressure oscillation and become easy.

(7) owing to do not have as A method in the past, to use superfine path, so can avoid foreign matter to be blocked in restriction as restriction.And, but because the 1st restriction 5 full cut-offs, so can fully guarantee to make the needed amount of restriction of the 1st restriction 5 full cut-offs.

(8) cold-producing medium circulation flow path 3 is separated by the 1st and the 2nd next door 10,11, with respect to a spool 4 of the 1st and the 2nd valve opening 12,13 drivings in the 1st and the 2nd next door 10,11.Thus, between the 1st valve opening 12 and the 1st spool portion 15, form the 1st restriction 5, between the 2nd valve opening 13 and the 2nd spool portion 71, form the 2nd restriction 6.In this case, for the expansion valve of the restriction with 2 level structures, its structure is simplified.

(the 13rd embodiment)

The 13rd embodiment of expansion valve of the present invention then, is described with reference to Figure 14 and Figure 15.In addition, for part identical in the 13rd embodiment, omit its detailed description with the 2nd embodiment.

As Figure 14 and shown in Figure 15, the 2nd spool portion 75 forms cone-shaped towards the front end of spool 24.On the inner peripheral surface of the 2nd valve opening 33, equally spaced be formed with 4 linearity grooves 76 that extend along the axis of spool 24.Each linearity groove 76 all has the general triangular cross section of same shape and same size.And the internal diameter of the 2nd valve opening 33 is set to, the 2nd spool portion 75 and the 2nd valve opening 33 size slidably when the amount of restriction of the 2nd restriction 26 is maximum.Thus, between linearity groove 76 and the 2nd spool portion 75, be formed with a plurality of refrigerant passage that constitute the 2nd restriction 26 respectively independently.In this case, slide in the axial direction, change the amount of restriction of the 1st restriction 25, and also change the length of the repeating part (linearity path 77) of linearity groove 76 and the 2nd spool portion 75 by making spool 24.At this moment, the circulating resistance of the cold-producing medium by the 1st restriction 25 and the 2nd restriction 26 changes respectively simultaneously.

According to the 13rd embodiment, can access following effect.

(1) under the situation that slug flow or plug flow flow into from ingress port 21a, by the 1st restriction 25 be positioned at the 2nd restriction 26 in its downstream, reduce the decompression amount of the 1st restriction 25, reduce from the ejection energy of the cold-producing medium of the 1st restriction 25 ejections.And then the cold-producing medium that sprays from the 1st restriction 25 is dispersed in a plurality of linearity paths 77, and thereupon, the kinergety of cold-producing medium stream is also disperseed.And owing to become turbulent flow by the cold-producing medium behind each linearity path 77, change of the flow velocity of cold-producing medium and pressure oscillation further relax.And the flow velocity change and the pressure oscillation of the cold-producing medium that flows out from each linearity path 77 are distinguished different.Therefore, the cold-producing medium that flows out from each linearity path 77 collides mutually, thereby the flow velocity change and the pressure oscillation of cold-producing medium reduce effectively.Therefore, the kinergety, speed fluctuation and the pressure oscillation that flow to the cold-producing medium stream of pipe arrangement from the 2nd restriction 26 further reduce, thereby can further be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

(2) can utilize the 1st restriction 25 and the 2nd restriction 26 that the circulating resistance of cold-producing medium is changed.Thus, can stably be reduced near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

The inner peripheral surface of the outer peripheral face of (3) the 2nd spool portions 75 and the 2nd valve opening 33 forms cone-shaped towards the front end of spool 24.Thus, foreign matter is difficult in the gap of inner peripheral surface of the outer peripheral face of the 2nd spool portion 75 that is blocked in and the 2nd valve opening 33, so can avoid problems such as the action of spool 24 is bad.

(4) since the outer peripheral face of the 2nd spool portion 75 be parallel to each other with the inner peripheral surface of the 2nd valve opening 33, so can irrespectively change and pressure oscillation with the aperture of the 2nd restriction 26 by the flow velocity that linearity path 77 relax cold-producing medium effectively.

(5) because each linearity groove 76 equally spaced forms,, the kinergety of cold-producing medium stream is more effectively disperseed so cold-producing medium can be evenly dispersed in each linearity path 77.

(6) owing to do not have as A method in the past, to use superfine path, so can avoid foreign matter to be blocked in restriction as restriction.And, but because the 1st restriction 25 full cut-offs, so can fully guarantee to make the needed amount of restriction of the 1st restriction 25 full cut-offs.

(7) cold-producing medium circulation flow path 23 is separated by the 1st and the 2nd next door 30,31, with respect to a spool 24 of the 1st and the 2nd valve opening 32,33 drivings in the 1st and the 2nd next door 30,31.Thus, between the 1st valve opening 32 and the 1st spool portion 35, form the 2nd restriction 26.In this case, for the expansion valve of the restriction with 2 level structures, its structure is simplified.

(the 14th embodiment)

The 14th embodiment of expansion valve of the present invention then, is described with reference to Figure 16 and Figure 17.In addition, for part identical in the 14th embodiment, omit its detailed description with the 12nd embodiment.

As Figure 16 and shown in Figure 17, on the outer peripheral face of the 2nd spool portion 81, equally spaced be formed with 4 linearity grooves 82.The inner peripheral surface of the 2nd valve opening 83 becomes the level and smooth taper surface that does not have groove.Between the inner peripheral surface of linearity groove 82 and the 2nd valve opening 83, be formed with 4 linearity paths 84 respectively independently.According to this structure, compare with the 12nd embodiment, can easily carry out the processing of linearity groove 82.

(the 15th embodiment)

The 15th embodiment of expansion valve of the present invention then, is described with reference to Figure 18.In addition, for part identical in the 15th embodiment, omit its detailed description with the 13rd embodiment.

As shown in figure 18, the outer peripheral face of the 2nd spool portion 85 forms the central axes with spool 24.The 2nd valve opening 33 forms cone-shaped towards the front end of spool 24.On the inner peripheral surface of the 2nd valve opening 33, be formed with a plurality of linearity grooves 76.Between the inner peripheral surface of the outer peripheral face of the 2nd spool portion 85 and the 2nd valve opening 33, be formed with a plurality of linearity paths 86 respectively independently.In this case, open and close the 2nd restriction 26 by making spool 24 advance and retreat, thereby the size in the gap of the inner peripheral surface of the outer peripheral face of the 2nd spool portion 85 and the 2nd valve opening 33 changes.That is,, can utilize the cold-producing medium fluid capacitance to change places to wash away the foreign matter in the gap of inner peripheral surface of the outer peripheral face of the 2nd spool portion 85 of nipping and the 2nd valve opening 33 by increasing the aperture of the 2nd restriction 26.

(the 16th embodiment)

The 16th embodiment of expansion valve of the present invention then, is described with reference to Figure 19.In addition, for part identical in the 16th embodiment, omit its detailed description with the 12nd embodiment.

As shown in figure 19, the inner peripheral surface of the 2nd valve opening 91 forms the central axes with spool 4.And, on the inner peripheral surface of the 2nd valve opening 91, be formed with cross section a plurality of linearity grooves 92 triangular in shape.Between the inner peripheral surface of the outer peripheral face of the 2nd spool portion 71 and the 2nd valve opening 91, be formed with a plurality of linearity paths 93 respectively independently.In this case, open and close the 2nd restriction 6 by making spool 4 advance and retreat, thereby the size in the gap of the inner peripheral surface of the outer peripheral face of the 2nd spool portion 71 and the 2nd valve opening 91 changes.That is,, can utilize the cold-producing medium fluid capacitance to change places to wash away the foreign matter in this gap of nipping by increasing the aperture of the 2nd restriction 6.

(the 17th embodiment)

The 17th embodiment of expansion valve of the present invention then, is described with reference to Figure 20～Figure 22.In addition, for part identical in the 17th embodiment, omit its detailed description with the 3rd embodiment.

As Figure 20～shown in Figure 22, the angle of taper α 1 of the 2nd spool portion 16 is identical with the angle of taper α 2 of the 2nd valve opening 13.In this case, the angle of taper α 2 of preferred the 2nd valve opening 13 is for roughly 5 degree～roughly 60 spend.The lower limit of angle of taper α 2 i.e. 5 degree is the lower limits that can remove the angle of taper α 2 of the foreign matter in the gap of inner peripheral surface of the ridge of the helicla flute 17 of nipping and the 2nd valve opening 13.And the higher limit of angle of taper α 2 is the value that 60 degree are based on the angle of taper α 2 that forms helicla flute 17 needed length.In the present embodiment, angle of taper α 1 and angle of taper α 2 are about 25 degree respectively.

The end of downstream side of the 2nd spool portion 16 is configured in the 2nd valve opening 13 in from minimum of a value (state of Figure 20) to the scope of maximum (state of Figure 21) in the aperture of the 2nd restriction 6.That is, the position X1 of the end of downstream side of the 2nd spool portion 16 and the aperture of the 2nd restriction 6 are irrelevant, are positioned at the below of position Y1 of the end of downstream side of the 2nd valve opening 13 all the time.

And the end of downstream side of the 2nd spool portion 16 is connected with connecting portion 14 via the 2nd reducing junction surface 96.The diameter d 1 of the maximum peripheral part of diameter d 2 to the 2 spool portions 16 of connecting portion 14 is little.The maximum peripheral part of the 2nd spool portion 16 is connected with connecting portion 14 continuously via the 2nd reducing junction surface 96.The 2nd reducing junction surface 96 forms cone-shaped from the 2nd spool portion 16 towards connecting portion 14.

The upstream-side-end of the 2nd spool portion 16 is configured in from minimum of a value (state of Figure 20) to the scope of maximum (state of Figure 21) in the aperture of the 2nd restriction 6 amplifies in the spatial portion 41.That is, the position X2 of the upstream-side-end of the 2nd spool portion 16 the aperture of the 2nd restriction 6 from minimum of a value in peaked scope, be positioned at the below of position Y2 of the upstream-side-end of the 2nd valve opening 13 all the time.

The 1st spool portion 15 forms cone-shaped towards the front end of spool 4.The angle of taper α 2 of angle of taper β 1 to the 2 valve opening 13 of the 1st spool portion 15 is big.And, between the 2nd spool portion 16 and the 1st spool portion 15, be provided with the 1st reducing junction surface 95.The 1st reducing junction surface 95 forms cone-shaped from the 2nd spool portion 16 towards the 1st spool portion 15.The angle of taper β 1 of angle of taper β 2 to the 1 spool portions 15 at the 1st reducing junction surface 95 is big.

The gap S1 of the 1st spool portion 15 and the 1st valve opening 12 is littler than the minimum clearance S2 of the 2nd spool portion 16 and the 2nd valve opening 13.The gap S1 of the 1st spool portion 15 and the 1st valve opening 12 is meant the beeline between the outlet side bight of the 1st spool portion 15 and the 1st valve opening 12.And the minimum clearance S2 of the 2nd spool portion 16 and the 2nd valve opening 13 is meant the beeline between the 2nd spool portion 16 and the 2nd valve opening 13.The angle of taper α 1 of the 2nd spool portion 16 is identical with the angle of taper α 2 of the 2nd valve opening 13.

According to the 17th embodiment, can access following effect.

(1), then in by the stream of the cold-producing medium after 6 rectifications of the 2nd restriction, can produce strong cycle stream if the end of downstream side of the 2nd spool portion 16 is outstanding to the downstream of the 2nd valve opening 13.In this respect, according to present embodiment, the end of downstream side of the 2nd spool portion 16 can be not outstanding to the downstream of the 2nd valve opening 13.In this case, owing to can avoid the turbulent flowization of cold-producing medium as described above, can reduce the abnormal sound of giving birth to by the cold-producing medium miscarriage.

The upstream-side-end of (2) the 2nd spool portions 16 is configured in from minimum of a value to peaked scope in the aperture of the 2nd restriction 6 amplifies in the spatial portion 41.In this case, can make cold-producing medium from amplifying spatial portion 41 swimmingly to 6 circulations of the 2nd restriction.Thus, can further reduce the abnormal sound of giving birth to by the cold-producing medium miscarriage.

The angle of taper α 1 of (3) the 2nd spool portions 16 is identical with the angle of taper α 2 of the 2nd valve opening 13.Thus, the aperture of the helical form path 18 that constitutes the 2nd restriction 6 and the 2nd restriction 6 is had nothing to do and effectively to cold-producing medium generation effect.

(4) because the angle of taper α 2 of angle of taper β 1 to the 2 valve opening 13 of the 1st spool portion 15 is big, so, the restriction effect of the 1st restriction 5 is changed than the 2nd restriction 6 biglyyer by making spool 4 advance and retreat.

(5) the angle of taper α 2 of preferred the 2nd valve opening 13 be roughly 5 the degree～roughly 60 the degree scopes.In this case, can be easy to remove the foreign matter of nipping in the gap of inner peripheral surface of the ridge of helicla flute 17 and the 2nd valve opening 13.And, also can fully guarantee the length of helicla flute 17.

The gap S1 of (6) the 1st spool portions 15 and the 1st valve opening 12 is littler than the minimum clearance S2 of the outer peripheral face of the 2nd spool portion 16 and the 2nd valve opening 13.Therefore, the restriction effect of the 1st restriction 5 is changed more significantly than the 2nd restriction 6, and, the obstruction of the foreign matter that causes by the 2nd restriction 6 also can be suppressed.Therefore, for example with the 1st restriction 5 as main restriction, the 2nd restriction 6 as abnormal sound suppressing portion etc., is made the 1st restriction 5 and the 2nd restriction 6 have different functions, thereby can realize the optimal design of expansion valve.

(7) diameter d 1 of the maximum peripheral part of diameter d 2 to the 2 spool portions 16 of connecting portion 14 is little.Therefore, can reduce the flow velocity that flows to the cold-producing medium of pipe arrangement from the 2nd restriction 6.Thus, near outlet port 1b, cold-producing medium stream can not produce unnecessary disorder, can reduce the abnormal sound of being given birth to by the cold-producing medium miscarriage.

(8) between connecting portion 14 and the 2nd spool portion 16, be formed with the 2nd reducing junction surface 96.In this case, in valve body 1, can further suppress the disorder that the cold-producing medium miscarriage is given birth to.Thereby, can further reduce the abnormal sound of giving birth to by the cold-producing medium miscarriage.

(9) between the end of downstream side of the upstream-side-end of the 2nd spool portion 16 and the 1st spool portion 15, be formed with the 1st reducing junction surface 95.And the angle of taper β 1 of angle of taper β 2 to the 1 spool portions 15 at the 1st reducing junction surface 95 is big.In this case, make the size optimization of the 1st and the 2nd valve opening 12,13 become easy respectively.

The present invention also can followingly change and specialize.

In the 1st embodiment, outlet port one b also can be set in the bottom of valve body 1, at the sidewall inlet porting port one a of valve body 1, cold-producing medium is flowed along the direction of arrow shown in the dotted line of Fig. 1.

And, in the 2nd embodiment, also can be at the bottom of valve body 21 inlet porting port 21a, at the sidewall of valve body 21 outlet port 21b is set, cold-producing medium is flowed along the direction of arrow shown in the dotted line of Fig. 2.

And, in the 6th embodiment, outlet port one b can be set also in the bottom of valve body 1, at the sidewall inlet porting port one a of valve body 1, cold-producing medium is flowed along the direction of arrow shown in the dotted line of Fig. 6.

And, in the 7th embodiment, also can be at the bottom of valve body 1 inlet porting port 21a, at the sidewall of valve body 1 outlet port 21b is set, thereby cold-producing medium is flowed along the direction of arrow shown in the dotted line of Fig. 7.

In these cases, the 2nd restriction all is made of the helical form path, can fully guarantee their path-length, therefore can suppress the pressure oscillation of biphase gas and liquid flow.And on one side along between the flow periods of helical form path cycle one side, the bubble in the cold-producing medium is segmented at cold-producing medium.Under the situation low at cooling load, that the cold-producing medium flow velocity is slow, promptly under the little situation in the gap of the inner peripheral surface of little, helicla flute of the aperture in the 2nd restriction and the 2nd valve opening, also can carry out the segmentation of this bubble fully.On the other hand, under the fast situation of the flow velocity of cooling load height, cold-producing medium, under the big situation in the gap of the inner peripheral surface of promptly big, helicla flute and the 2nd valve opening, also can carry out the segmentation of bubble fully in the aperture of the 2nd restriction.Therefore, the segmentation effect by bubble and the pressure oscillation of biphase gas and liquid flow suppress effect, at slug flow or plug flow when ingress port flows into, from of the cold-producing medium stream serialization of the 2nd restriction towards the 1st restriction.

And, by making from the 2nd restriction towards the cold-producing medium of the 1st restriction stream, thereby the amount of restriction of the 1st restriction is reduced to linear, the kinergety of the cold-producing medium stream by the 1st restriction is reduced.Therefore, reduce the pressure oscillation that cold-producing medium causes in the 1st restriction.

And, but because the 1st restriction full cut-off, so can fully guarantee to make the needed amount of restriction of the 1st restriction full cut-off.And, to compare with A method in the past, foreign matter also is difficult for stopping up.

And the inner peripheral surface of the outer peripheral face of the 2nd spool portion and the 2nd valve opening all forms cone-shaped towards the front end of spool.In this case, even increase the aperture of the 2nd restriction, also can make the variable quantity in gap of inner peripheral surface of helicla flute and the 2nd valve opening minimum.Thereby, irrelevant with the aperture of the 2nd restriction, can easily keep the shape of helical form path, can give full play to segmentation effect based on the bubble of helical form path.

And the inner peripheral surface of the outer peripheral face of the 2nd spool portion and the 2nd valve opening all has same angle of taper.Therefore, irrelevant with the aperture of the 2nd restriction, can keep the shape of helical form path more easily, can play consistently segmentation effect based on the bubble of helical form path.

And,, become easy so spiral fluted is processed because helicla flute is formed on the outer peripheral face of the 2nd spool portion.

And spool has the 1st spool portion at leading section, has the 2nd spool portion at pars intermedia.And, on the outer peripheral face of the 2nd spool portion, be formed with helicla flute.In this case, if increase the external diameter of the 2nd spool portion, then can fully guarantee the length of helical form path.

In the 3rd embodiment, outlet port one b also can be set in the bottom of valve body 1, at the sidewall inlet porting port one a of valve body 1, cold-producing medium is flowed along the direction of arrow shown in the dotted line of Fig. 3.In this case, in amplifying spatial portion 41, disorderly by the stream of the cold-producing medium after the 2nd restriction 6, the bubble in the cold-producing medium is further segmented.Thus, can further suppress by the living abnormal sound of cold-producing medium miscarriage.

In the 5th embodiment, outlet port one b also can be set in the bottom of valve body 1, at the sidewall inlet porting port one a of valve body 1, cold-producing medium is flowed along the direction of arrow shown in the dotted line of Fig. 5.In this case, with in the spatial portion 44, producing cycle stream from the 2nd restriction 6 in cycle towards the cold-producing medium stream of the 1st valve opening 12, the bubble in the cold-producing medium is further segmented.Thus, can further suppress by the living abnormal sound of cold-producing medium miscarriage.

In the 8th embodiment, outlet port one b also can be set in the bottom of valve body 1, at the sidewall inlet porting port one a of valve body 1, cold-producing medium is flowed along the direction of arrow shown in the dotted line of Fig. 8.

In the 9th embodiment, also can be at the bottom of valve body 1 inlet porting port one a, at the sidewall of valve body 1 outlet port one b is set, cold-producing medium is flowed along the direction of arrow shown in the dotted line of Fig. 9.

In these cases, when the aperture of the 2nd restriction reduced, thereupon, the sectional area of helical form path also reduced.Thus, can regulate the aperture of the 2nd restriction by spiral fluted length and sectional area.Thereby, can increase amount of restriction with respect to the amount of movement of spool.

In the 10th embodiment, outlet port one b also can be set in the bottom of valve body 1, at the sidewall inlet porting port one a of valve body 1, cold-producing medium is flowed along the direction of arrow shown in the dotted line of Figure 10.

And, in the 11st embodiment, outlet port one b can be set also in the bottom of valve body 1, at the sidewall inlet porting port one a of valve body 1, cold-producing medium is flowed along the direction of arrow shown in the dotted line of Figure 11.

In these cases, because when the aperture of the 1st restriction 5 reduces, the gap between the 2nd spool portion 16 and the 2nd valve opening 13 also reduces, so foreign matter is nipped easily in this gap.But, because when the aperture of the 1st restriction 5 increased, this gap also increased, so can easily wash away foreign matter by cold-producing medium.Like this, owing to can suppress the obstruction of foreign matter, so can avoid problems such as the action of spool 4 is bad.

In the 17th embodiment, outlet port one b also can be set in the bottom of valve body 1, at the sidewall inlet porting port one a of valve body 1, cold-producing medium is flowed along the direction of arrow shown in the dotted line of Figure 20～Figure 22.

In this case, the upstream-side-end of the 2nd spool portion 16 is configured in the 2nd valve opening 13 in from minimum of a value to peaked scope in the aperture of the 2nd restriction 6.In this case, before the bubble segmentation that makes by helical form path 18 in the cold-producing medium, can avoid in cold-producing medium stream, producing disorderly by the 2nd spool portion 16.

And the end of downstream side of the 2nd spool portion 16 is configured in from minimum of a value to peaked scope in the aperture of the 2nd restriction 6 amplifies in the spatial portion 41.In this case, cold-producing medium is circulated to amplifying spatial portion 41 from helical form path 18.And biphase gas and liquid flow becomes turbulent flow in amplifying spatial portion 41, and the bubble in the cold-producing medium is segmented.Thereby, can further reduce the abnormal sound of giving birth to by the cold-producing medium miscarriage.

And the inner peripheral surface of the outer peripheral face of the 2nd spool portion 16 and the 2nd valve opening 13 all forms cone-shaped towards the front end of spool 4, and their angle of taper is identical.In this case, because big variation can not take place because of the aperture of the 2nd spool portion 16 in helical form path 18, so can stably the bubble in the cold-producing medium be segmented.

And the gap S1 of the 1st spool portion 15 and the 1st valve opening 12 is littler than the minimum clearance S2 of the 2nd spool portion 16 and the 2nd valve opening 13, and irrelevant with the aperture of the 1st restriction 5 and the 2nd restriction 6.In this case, the restriction effect of the 1st restriction 5 is bigger than the 2nd restriction 6, and the foreign matter that can suppress to be caused by the 2nd restriction 6 stops up.

The diameter d 1 of the maximum peripheral part of diameter d 2 to the 2 spool portions 16 of connecting portion 14 is little.In this case, because the cold-producing medium stream that flows in the valve body 1 can not be connected portion's 14 obstructions, so can further reduce the abnormal sound of giving birth to effectively by the cold-producing medium miscarriage.

In the respective embodiments described above, also expansion valve can be used for many indoor units are connected a multi-connected air conditioner on the outdoor unit.Usually, in multi-connected air conditioner, the possibility of sneaking into bigger bubble from the inlet of expansion valve is very high.Therefore, if expansion valve of the present invention is used for multi-connected air conditioner, then can further reduce the abnormal sound of giving birth to effectively by the cold-producing medium miscarriage.

In each embodiment, the 1st restriction 5,25 also can be used in the scope of full cut-off not, and also the 1st restriction 5,25 can be constituted can not full cut-off.

In the 2nd and the 6th～16 embodiment, also can form the amplification spatial portion 41 shown in the 3rd embodiment.In these cases, owing to can relax the flow velocity change and the pressure oscillation of cold-producing medium, thus can further be reduced in effectively near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

In the 6th, 8,10～12,14 and 16 embodiments, also can form the amplification spatial portion 41 shown in the 3rd embodiment, and in the 1st spool portion 15, the guide portion shown in the 4th embodiment is set.In these cases, owing in amplifying spatial portion 41, promote the generation of vortex, thus can further be reduced in effectively near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

In the 4th, 6,8,10～12,14,16 and 17 embodiments, also can form the valve seat 43 shown in the 5th embodiment, and be formed for making the vortex of cold-producing medium cycle to form space 44.In these cases, owing to form the generation that promotes vortex in the space 44 at vortex, thus can be reduced in effectively near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

In the 2nd～9 and 11 embodiments, also can be as the 10th embodiment, the inner peripheral surface of the 2nd valve opening 13,33,47,52 is the faces with the central axes of spool 4,24.

Equally, in the 12nd～15 embodiment, also can be as the 16th embodiment, the inner peripheral surface of the 2nd valve opening 13,33,83 is the faces with the central axes of spool 4,24.

In the 2nd～5,8 and 9 embodiments, also can be as the 11st embodiment, the face that connects the ridge of helicla flute 17,37,55,61 is the parallel face of center line with spool 4,24.

In the 6th and 7 embodiments, also the inner peripheral surface of the 2nd valve opening 47,52 can be formed parallelly with the center line of spool 24, helicla flute 48,53 is formed on the inner peripheral surface of the 2nd valve opening 47,52.

In the 3rd～5 and 10 embodiments, also can be as the 8th embodiment, form the outer peripheral face of the 2nd spool portion 16 parallel with the center line of spool 4, outer peripheral face chasing to the 2nd spool portion 16 forms helicla flute 17, and then, the top of the ridge of cutting helicla flute 17, the outer peripheral face with the 2nd spool portion 16 forms cone-shaped towards the front end of spool 4 thus.In these cases, the aperture of regulating the 2nd restriction 6 by the length and the sectional area of helicla flute 17.

In the 6th and 7 embodiments, also the inner peripheral surface of the 2nd valve opening 47,52 can be formed parallelly with the center line of spool 24, on the inner peripheral surface of the 2nd valve opening 47,52, form helicla flute 48,53, the top of cutting the ridge of helicla flute 48,53 then.In these cases, the aperture of regulating the 2nd restriction 6,26 by the length and the sectional area of helicla flute 48,53.

In the 1st～11 and the 17th embodiment, the helicla flute 17,37,48,53,55,61,67 of a plurality of the 2nd restriction 6,26 also can be set, and they are formed side by side.In these cases, the cold-producing medium that flows out from each helical form path 18,38,49,54,57,63,66,69 collides mutually, thus, can further reduce the flow velocity change and the pressure oscillation of cold-producing medium effectively.

In the 12nd～16 embodiment, the cross sectional shape of linearity groove 72,76,82,92 also can be a shape arbitrarily such as circle, Long Circle, ellipse, コ font.And, also can change the sectional area of linearity groove 72,76,82,92 in the advance and retreat direction of spool 4,24, the sectional area of each linearity path 73,77,84,86,93 is changed.And, also can change the quantity of linearity groove 72,76,82,92, make the sum variation of the sectional area of each linearity groove 72,76,82,92.

In the 13rd, 15 and 16 embodiments, also can in the 2nd spool portion 75,85,71, a plurality of linearity grooves be set independently respectively as the 14th embodiment.

In the 13rd embodiment, also can be as the 16th embodiment, the inner peripheral surface of the 2nd valve opening 33 is the faces with the central axes of spool 24.And, in the 12nd embodiment, also can be as the 15th embodiment, the outer peripheral face of the 2nd spool portion 71 is the faces with the central axes of spool 4.

In the 1st～9 and 17 embodiments, also can make the 2nd spool portion 16,36,46,51,56,62 different in the angle of taper of inner peripheral surface with the 2nd valve opening 13,33,47,52.

In the 12nd～14 embodiment, also can make the outer peripheral face of the 2nd spool portion 71,75,81 and the angle of taper of the inner peripheral surface of the 2nd valve opening 13,33,83 distinguish different.

In the 17th embodiment, also can on the inner peripheral surface of the 2nd valve opening 13, form helicla flute 17.In this case, also can be reduced in effectively near the outlet of expansion valve, by the living abnormal sound of cold-producing medium miscarriage.

Expansion valve of the present invention and refrigerating plant can be applied in the airconditions such as integral type, separate type, multiple, and, also can be applied in the refrigerant loop (for example refrigerator etc. refrigerant loop) beyond the aircondition.

Claims (48)

1. an expansion valve is characterized in that,

This expansion valve has: valve body; Be formed on ingress port and outlet port on the described valve body; Be formed on the valve chamber in the described valve body; Be formed in the described valve body, connect the cold-producing medium circulation flow path of described ingress port and outlet port via described valve chamber; Be accommodated in the spool in the described valve chamber; Be formed on the 1st restriction on the described cold-producing medium circulation flow path; And the 2nd restriction that on described cold-producing medium circulation flow path, is formed on the downstream of described the 1st restriction,

Described valve body has: the 1st next door that separates the cold-producing medium stream in the described cold-producing medium circulation flow path; The 2nd next door with the cold-producing medium in the downstream that separates described the 1st next door stream is formed with the 1st valve opening on described the 1st next door, be formed with the 2nd valve opening on described the 2nd next door,

Described spool is made of bar-like member, is being formed with on the outer peripheral face of this bar-like member: and form the 1st spool portion of described the 1st restriction between described the 1st valve opening; And and described the 2nd valve opening between form the 2nd spool portion of described the 2nd restriction,

Can change the aperture of described the 1st restriction by making the valve seat advance and retreat of described the 1st spool portion with respect to described the 1st valve opening,

On the inner peripheral surface of the outer peripheral face of described the 2nd spool portion or described the 2nd valve opening, be formed with groove,

At least one side in the inner peripheral surface of the outer peripheral face of described the 2nd spool portion and described the 2nd valve opening forms cone-shaped towards the front end of described spool,

Described the 2nd restriction by be formed on described groove and and the inner peripheral surface of the outer peripheral face of right described the 2nd spool portion of this groove face or described the 2nd valve opening between path constitute.

2. expansion valve according to claim 1 is characterized in that,

But described the 1st restriction is advanced and retreat and full cut-off with respect to the valve seat of described the 1st valve opening by making described the 1st spool portion.

3. expansion valve according to claim 1 and 2 is characterized in that,

The inner peripheral surface of the outer peripheral face of described the 2nd spool portion and described the 2nd valve opening all forms cone-shaped towards the front end of described spool.

4. expansion valve according to claim 3 is characterized in that,

The outer peripheral face of described the 2nd spool portion is identical with the angle of taper of the inner peripheral surface of described the 2nd valve opening.

5. expansion valve according to claim 1 and 2 is characterized in that,

Described groove is formed on the outer peripheral face of described the 2nd spool portion.

6. expansion valve according to claim 1 and 2 is characterized in that,

Described spool has described the 1st spool portion at leading section, has described the 2nd spool portion at pars intermedia.

7. expansion valve according to claim 1 and 2 is characterized in that,

Be formed with the amplification spatial portion at cold-producing medium circulation flow path from described the 1st restriction to described the 2nd restriction.

8. expansion valve according to claim 7 is characterized in that,

Described the 1st spool portion has and is used to make by the guide portion of the stream of the cold-producing medium behind described the 1st valve opening at described amplification spatial portion intrinsic deflection.

9. expansion valve according to claim 1 and 2 is characterized in that,

Described groove is a helicla flute, described the 2nd restriction by be formed on described helicla flute and and the inner peripheral surface of the outer peripheral face of right described the 2nd spool portion of this spiral groove face or described the 2nd valve opening between the helical form path constitute.

10. expansion valve according to claim 1 and 2 is characterized in that,

Described the 1st spool portion is formed on the leading section of described spool, described the 2nd spool portion is formed on the pars intermedia of this spool, the inner peripheral surface of described the 2nd spool portion and described the 2nd valve opening forms cone-shaped towards the front end of described spool, described groove is a helicla flute, and the end of downstream side of described the 2nd spool portion is configured in described the 2nd valve opening in from minimum of a value to peaked scope in the aperture of described the 2nd restriction.

11. expansion valve according to claim 1 and 2 is characterized in that,

The 1st spool portion is formed on the leading section of described spool, the 2nd spool portion is formed on the pars intermedia of described spool, the inner peripheral surface of the outer peripheral face of described the 2nd spool portion and the 2nd valve opening forms cone-shaped towards the front end of described spool, described groove is a helicla flute, cold-producing medium circulation flow path from described the 1st restriction to described the 2nd restriction, be formed with the amplification spatial portion near the inlet of described the 2nd valve opening, the upstream-side-end of described the 2nd spool portion is configured in the described amplification spatial portion in from minimum of a value to peaked scope in the aperture of described the 2nd restriction.

12. expansion valve according to claim 10 is characterized in that,

Described helicla flute is formed on the outer peripheral face of described the 2nd spool portion.

13. expansion valve according to claim 10 is characterized in that,

Described the 2nd spool portion is identical with the angle of taper of described the 2nd valve opening.

14. expansion valve according to claim 10 is characterized in that,

The angle of taper of described the 1st spool portion is bigger than the angle of taper of described the 2nd valve opening.

15. expansion valve according to claim 14 is characterized in that,

The angle of taper of described the 2nd valve opening is in the scope of 5 degree～60 degree.

16. expansion valve according to claim 10 is characterized in that,

Gap between near described the 1st spool portion that forms the outlet of described the 1st restriction and the 1st valve opening, littler than the minimum of a value in described the 2nd spool portion that forms in described the 2nd restriction and the gap between described the 2nd valve opening.

17. expansion valve according to claim 10 is characterized in that,

Downstream in described the 2nd spool portion of described spool is provided with connecting portion, and the diameter of described connecting portion is littler than the diameter of the maximum peripheral part of described the 2nd spool portion.

18. expansion valve according to claim 17 is characterized in that,

On described spool, between described connecting portion and described the 2nd spool portion, be formed with the 2nd reducing junction surface, described the 2nd reducing junction surface forms cone-shaped from described maximum peripheral part towards described connecting portion.

19. expansion valve according to claim 10 is characterized in that,

Between the end of downstream side of the upstream-side-end of described the 2nd spool portion and described the 1st spool portion, be formed with from the 1st reducing junction surface of the 2nd spool portion towards the tapered shape of described the 1st spool portion, the angle of taper at described the 1st reducing junction surface is bigger than the angle of taper of described the 1st spool portion.

20. expansion valve according to claim 9 is characterized in that,

Described the 2nd spool portion passes through after forming described helicla flute on the outer peripheral face of described bar-like member, the top of cutting this spiral fluted ridge, thus form cone-shaped towards the front end of described spool.

21. expansion valve according to claim 9 is characterized in that,

Described the 2nd spool portion by with the outer peripheral face of described bar-like member after the front end of described spool forms cone-shaped, the described helicla flute of processing on its outer peripheral face and forming.

22. expansion valve according to claim 9 is characterized in that,

Described helicla flute is made of a plurality of helicla flutes.

23. expansion valve according to claim 1 and 2 is characterized in that,

Described valve seat is make described the 1st valve opening outstanding and formation from the wall in described the 1st next door on every side.

24. expansion valve according to claim 1 and 2 is characterized in that,

Described groove is upwardly extending a plurality of straight-line grooves in the advance and retreat side of described spool, described the 2nd restriction by this linearity groove and and the right face of this linearity groove face between the path of a plurality of independently linearities of forming constitute.

25. expansion valve according to claim 24 is characterized in that,

Described each straight-line groove equally spaced forms.

26. a refrigerating plant is characterized in that, this refrigerating plant has claim 1 or 2 described expansion valves.

27. an expansion valve is characterized in that,

This expansion valve has: valve body; Be formed on the cold-producing medium circulation flow path in the described valve body; Be accommodated in the spool that constitutes by bar-like member in the described valve body; Be formed on the 1st restriction on the described cold-producing medium circulation flow path; And the 2nd restriction that on described cold-producing medium circulation flow path, is formed on the upstream side of described the 1st restriction,

Described valve body has: the 1st next door that separates the cold-producing medium stream in the described cold-producing medium circulation flow path; With the 2nd next door of the cold-producing medium of the upstream side that separates described the 1st next door stream,

On described the 1st next door, be formed with the 1st valve opening, on described the 2nd next door, be formed with the 2nd valve opening,

The outer peripheral face of described spool forms cone-shaped, and described spool has: can with the 1st spool portion of the valve seat butt of described the 1st valve opening; With the 2nd spool portion that faces mutually with the inner peripheral surface of described the 2nd valve opening,

Can change the aperture of described the 1st restriction by described the 1st spool portion is advanced and retreat with respect to described the 1st valve opening,

Described the 2nd restriction is made of spiral helicine path, and this spiral helicine path is formed between the inner peripheral surface of the outer peripheral face of helicla flute that forms on the inner peripheral surface of the outer peripheral face of described the 2nd spool portion or described the 2nd valve opening and described the 2nd spool portion or described the 2nd valve opening,

At least one side in the inner peripheral surface of the outer peripheral face of described the 2nd spool portion and described the 2nd valve opening forms cone-shaped towards the front end of described spool.

28. expansion valve according to claim 27 is characterized in that,

But described the 1st restriction is advanced and retreat and full cut-off with respect to described the 1st valve opening by making described the 1st spool portion.

29. according to claim 27 or 28 described expansion valves, it is characterized in that,

The inner peripheral surface of the outer peripheral face of described the 2nd spool portion and described the 2nd valve opening all forms cone-shaped towards the front end of described spool.

30. expansion valve according to claim 29 is characterized in that,

The outer peripheral face of described the 2nd spool portion is identical with the angle of taper of the inner peripheral surface of described the 2nd valve opening.

31. according to claim 27 or 28 described expansion valves, it is characterized in that,

Described helicla flute is formed on the outer peripheral face of described the 2nd spool portion.

32. according to claim 27 or 28 described expansion valves, it is characterized in that,

Described spool has described the 1st spool portion at leading section, has described the 2nd spool portion at pars intermedia.

33. according to claim 27 or 28 described expansion valves, it is characterized in that,

From described the 2nd restriction to the refrigerant passage of described the 1st valve opening, near the inlet of described the 1st valve opening, be formed with the amplification spatial portion.

34. according to claim 27 or 28 described expansion valves, it is characterized in that,

Described spool has described the 1st spool portion at leading section, has described the 2nd spool portion at pars intermedia, the inner peripheral surface of the outer peripheral face of described the 2nd spool portion and the 2nd valve opening forms cone-shaped towards the front end of described spool, and the upstream-side-end of described the 2nd spool portion is configured in described the 2nd valve opening in from minimum of a value to peaked scope in the aperture of described the 2nd restriction.

35. according to claim 27 or 28 described expansion valves, it is characterized in that,

The 1st spool portion is formed on the leading section of described spool, the 2nd spool portion is formed on the pars intermedia of described spool, the inner peripheral surface of the outer peripheral face of described the 2nd spool portion and described the 2nd valve opening forms cone-shaped towards the front end of described spool, from the refrigerant passage of described the 2nd restriction to the 1 valve opening, be formed with the amplification spatial portion near the inlet of described the 1st valve opening, the end of downstream side of described the 2nd spool portion is configured in the described amplification spatial portion in from minimum of a value to peaked scope in the aperture of described the 2nd restriction.

36. expansion valve according to claim 34 is characterized in that,

Described helicla flute is formed on the outer peripheral face of described the 2nd spool portion.

37. expansion valve according to claim 34 is characterized in that,

Described the 2nd spool portion is identical with the angle of taper of described the 2nd valve opening.

38. expansion valve according to claim 34 is characterized in that,

The angle of taper of described the 1st spool portion is bigger than the angle of taper of described the 2nd valve opening.

39. according to the described expansion valve of claim 38, it is characterized in that,

The angle of taper of the taper surface of described the 2nd valve opening is in the scope of 5 degree～60 degree.

40. expansion valve according to claim 34 is characterized in that,

Gap between near described the 1st spool portion that forms the inlet of described the 1st restriction and the 1st valve opening, littler than the minimum of a value in described the 2nd spool portion that forms in described the 2nd restriction and the gap between described the 2nd valve opening.

41. expansion valve according to claim 34 is characterized in that,

Upstream side in described the 2nd spool portion of described spool is provided with connecting portion, and the diameter of this connecting portion is littler than the diameter of the maximum peripheral part of described the 2nd spool portion.

42. according to the described expansion valve of claim 41, it is characterized in that,

Be formed with the 2nd reducing junction surface between described connecting portion and described the 2nd spool portion, the 2nd reducing junction surface forms conical in shape from the maximum peripheral part of the 2nd spool portion towards the peripheral part of described connecting portion.

43. expansion valve according to claim 34 is characterized in that,

Between the upstream-side-end of the end of downstream side of described the 2nd spool portion and described the 1st spool portion, be formed with from the 1st reducing junction surface of the 2nd spool portion towards the tapered shape of described the 1st spool portion, the angle of taper at described the 1st reducing junction surface is bigger than the angle of taper of described the 1st spool portion.

44. according to claim 27 or 28 described expansion valves, it is characterized in that,

Following such formation of described helicla flute: at outer peripheral face or the inner peripheral surface of the 2nd valve opening and the laggard capable chasing of central axes ground formation of described spool with described the 2nd spool portion, and then, the top of screw cutting tooth, the face that is thus connected the top of described ridge becomes taper surface.

45. according to claim 27 or 28 described expansion valves, it is characterized in that,

Described helicla flute forms cone-shaped by the outer peripheral face with described spool and its machined surface chasing is formed.

46. according to claim 27 or 28 described expansion valves, it is characterized in that,

Described valve seat is make described the 1st valve opening outstanding and formation from the wall portion in described the 1st next door on every side.

47. according to claim 27 or 28 described expansion valves, it is characterized in that,

Described helicla flute is made of a plurality of helicla flutes.

48. a refrigerating plant is characterized in that, this refrigerating plant has claim 27 or 28 described expansion valves.

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