CN1112515C - Shaft structure of screw rotor for screw fluid machinery - Google Patents
Shaft structure of screw rotor for screw fluid machinery Download PDFInfo
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- CN1112515C CN1112515C CN97102933A CN97102933A CN1112515C CN 1112515 C CN1112515 C CN 1112515C CN 97102933 A CN97102933 A CN 97102933A CN 97102933 A CN97102933 A CN 97102933A CN 1112515 C CN1112515 C CN 1112515C
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Abstract
To prevent a synthetic resin rotor formed around a metallic shaft from falling off from the shaft and to prevent generation of rust in a screw rotor to be assembled to a screw fluid machine. In a screw rotor in which a synthetic resin rotor 5 is formed around a metallic shaft 1, a spiral groove 3, whose rotating direction is reverse to that of the screw rotor, is formed on the circumferential face of a shaft part coated with a synthetic resin material. The spiral groove 3 consists of a groove face with a circular arc shaped cross section and an outline connecting the connecting parts between the groove face and the adjacent circular arc groove face together by a smooth angle curved line, while stepped parts 7 are arranged in the shaft parts coated by the rotor 5, and the synthetic resin coating is formed on the shaft surface to the rotor 5 continuously.
Description
Technical field
Linkage structure employed helical rotor, above-mentioned helical rotor axle and mounting structures above-mentioned helical rotor, the relative rotor of axle such as structure, the especially compressor of the axle of the helical rotor that the present invention relates to use in the screw fluid machine, decompressor, vacuum pump.
Background technique
This in the past helical rotor is that rotor and rotor shaft form as one.For example, the axle that rotor, central shaft and rotor shaft constituted is made by same metallic material cutting.Perhaps also proposed such scheme,, around metal shaft, covered, formed plastic rotor by injection moulding exactly in order to improve its processability and weight reduction.
Even the size of rotor is identical between each machine, because variation of screw fluid machine head pressure and driving prime mover and different according to the screw fluid machine use, and the surface treatment of change axial length, the diameter of axle or axle, so that the manufacturing process of rotor becomes complicated, and of a great variety.
So there are a lot of problems, be example with the diameter of each one of helical rotor, the diameter of rotor tooth portion approximately is 3～4 times of axle usually.Therefore there is following problem at manufacture view:
(1) be under the situation about being made by same metallic material cutting at rotor and axle, use the raw material that conform to the diameter of rotor tooth portion, must it be cut to the diameter of axle of hope with cutting, therefore, material and machining period produce waste greatly.
(2) make thermosetting synthetic resin system rotor under situation about forming as one with it around the metal shaft, the metallic material that the diameter of preparation and axle matches is just passable, but it is very long because of compare axle with the diameter of axle, so add the problems such as measure that to consider to tackle the vibration of axial length bar center man-hour, make productivity worsen.
(3) and, because rotor shaft is very long, the mold of rotor is also very big, except that the price height, the operation during shaping is also bad.In addition, too, operation is bad when surface treatment.
(4) for example, the water-jetting type compressor ejects water to the compression space, to cooling off and seal in this space, under axle and situation that the fluid that contains atmosphere or moisture contacts, will get rusty between the long-term spreadable life, this is the reason of this envelope portion leakage and slide part inordinate wear.
(5) even because the tooth proportions of rotor is identical, the diameter of axle also is different with axial length, so parts can not be general, manufacturing and management aspect are also very complicated.
As the method that addresses these problems, for weight reduction, helical rotor portion is divided into the hollow minor diameter part and the hollow large-diameter portion is processed, want by friction welded each opposed end face that connects, as this screw compressor, Japan Patent is real opens the content that clear 57-105418 communique has this respect, but its structure is to adopt quill shaft, and it connects also by friction welded connection, and this is not the key point that solves above-mentioned variety of problems.In addition, Japan Patent is real drives the disclosed screw compressor of clear 56-49311 communique, is to connect each bent axle with spline simply, injects elastomer at its spline joint, also reduces noise to reduce wear.In addition, the real disclosed screw shaft of flat 2-71108 communique of opening of Japan Patent, any one party formation groove at transmission shaft and cranse forms the projection that combines with this groove the opposing party.In addition, as the special public clear 52-25562 communique of Japan Patent is disclosed, it is the sleeve that on the impeller of compressor, is set to one, screw cutting on the hole of this sleeve, the screw section that holds axle is assembled into, but these methods are that what certain key issue or the like is used as in general installation, but are not the key point that solves above-mentioned variety of problems in fact.
Helical rotor covers plastic rotor, be formed at around the above-mentioned metal shaft by injection moulding, and the formation method of relevant such helical rotor is on record in the past, and the helical rotor of this pattern is shown among Figure 12.
Shown in Figure 12 is with reference to Figure 12 (b) with the plane A-A[that comprises axle (being illustrated as recessed rotor)] partial sectional view [figure (a)] and the front elevation [scheming (b)] that cut off, but on the circumferential surface of the axle 41 that central shaft 38 and rotor shaft 36 by these helical rotors are constituted, be formed with wall scroll or many groove 39 or the projections that section is square (quadrilateral), this groove 39 or projection have with the Hand of spiral of the tooth 46 of rotor 1f in the same way with reverse helix angle, strengthen the connection power between axle 41 and the rotor 1f, prevent that disengaging that both ask is (for example, with reference to Japanese patent laid-open 6-123292 communique, Te Kaiping 1-301976 communique etc.).
These helical rotors are owing to being to be formed at rotor surface by synthetic resin, so can not get rusty.
Therefore, this helical rotor screw compressor (water-jetting type screw compressor) that is used to eject water in the compression space is optimum.
But, forming sectional shape on the circumferential surface of axle 41 is square groove 39, coverage of synthetic resin here, axle 41 and rotor 1f are combined, this helical rotor, the thermal shrinkage of its metal shaft 41 and synthetic resin system rotor 1f is poor, and (axle-thermal shrinking quantity is little, rotor-thermal shrinking quantity is big) and altering a great deal with when running rotation torque of producing of load variations, will produce stress in the corner of rotor (synthetic resin part) and the corresponding groove of peak portion of the groove 39 that is arranged at axle surface concentrates, above-mentioned thermal shrinkage difference is because the difference of the linear expansion coeffcient due to axle and rotor material different, during the cooling of synthetic resin rotor behind injection moulding, or with compressor operation and temperature variation when stopping produce.
There is following problem in the helical rotor of this pattern: for above-mentioned reasons, rotor 1f produces be full of cracks from the peak corner of portion that is arranged at the surperficial groove 39 of axle to the profile of tooth bottom of rotor 1f easily, time long or turn round repeatedly, when stopping, this be full of cracks can enlarge, connection power between axle 41 and the rotor 1f can reduce, and final axle will separate with rotor.
On the other hand, the water-jetting type screw compressor is observed, then can be found it is characterized in that, under the situation of the helical rotor that adopts above-mentioned pattern, because rotor is plastic, so can prevent to get rusty if quote Figure 13.But the problem that exists is: because axle 41 is metal, in addition between compression chamber and the axle envelope portion (water gland seal device) spool surperficial with supply to the compression chamber in water contact, to get rusty in this surface.
Like this, the helical rotor of existing water-jetting type screw compressor, at axial region, especially under the axle surperficial rusty situation of embedding water with gland seal device, the axle surface can be corroded because of getting rusty, the diameter of axle of this part will attenuate, will produce the gap between above-mentioned gland seal device and axle surface, damage gland seal device body reduces the axle sealing property.
Therefore, have following problem: the water that supplies to the compression chamber leaks to the axle head of helical rotor axle from the gap between above-mentioned gland seal device and the axle surface, flow into bearing portion with axle envelope portion adjacency, bring out the deterioration and the emulsion of lubricant oil, and then cause bearing life and reduce, so its antirust countermeasure just constitutes a problem.
In addition, also there is following variety of problems: reduce owing to the generation along with above-mentioned corrosion makes an envelope portion performance, it is indoor that the lubricant oil that supplies to bearing portion flow into compression from the gap between axle envelope portion and the axle surface, sneak in the water of the cooling that supplies to this application chamber, sealing usefulness, water is polluted, and oil content also is blended in the exhausting air, brings bad influence for the use machine that consumes side.
Therefore, the material of above-mentioned helical rotor axle can adopt stainless steel, or a plating and a coating that favorable rust preventing effect is implemented on the axle surface that embeds gland seal device are handled, carry out antirust, but the price of helical rotor and the problem that processing charges increase have appearred again like this.
Summary of the invention
The objective of the invention is to:
The the 1st or the 2nd, adopt simple axle to be connected to form, can adopt same rotor in the multiple machinery of different axial lengths, not waste the helical rotor material, solving because of making processing needs the problem that a lot of man-hours, cost uprised, in addition, can divide unreeling, install easily, make the mechanical miniaturization of shaping usefulness, the special axis of only processing in the multiple machinery is just passable, the processing of axle is easy to, and can reduce manufacture cost.
The 3rd, add any one problem of the 1st or the 2nd, can prevent the assembly defect of rotor and rotor shaft, further reduce cost.
The the 4th and the 5th, add any one problem of the 1st to the 3rd, cover, so as the antirust countermeasure of axle because central shaft is synthesized resin, make it only the part of necessity be carried out antirust processing or surface treatment at an easy rate, adopt resistant material easily.
The 6th, add any one problem of the 1st to the 5th, owing to be equipped with vent, this vent connects axle head to its opposite side from being arranged with in the embedded hole of rotor shaft or central shaft, can successfully embed when connecting because of axle, can very easily and positively carry out so insert operation, and be arranged with portion, because of running with the temperature difference when stopping can to ventilate (respiration).
The the 7th and the 8th, add any one problem of the 1st to the 6th, because of the linear expansion coeffcient of the material that is embedded in central shaft outward is littler than the linear expansion coeffcient of embedded axle,, can make it positively keep mated condition for a long time so the effect of the conduction heat that produces with compression is to make its cooperation bind round tightlyer.
The 9th, another object of the present invention, be to provide a kind of helical rotor, make it around metal shaft, be formed with the helical rotor of plastic rotor, can overcome above-indicated all problems, make the connection power between axle and the rotor very firm, and can eliminate by temperature variation produce, the concentrated stress of joint, and can prevent the axle surface oxidisation of an envelope portion, and cheap, and processability is good.
In order to reach above-mentioned the 1st to the 8th purpose, feature of the present invention is: the helical rotor of screw fluid machine possesses the rotor that is formed with helical tooth and protrudes in the central shaft of the outer end of at least one side on this rotor axis, the outer end of this central shaft is provided with step, be equipped with the path axle, and the in addition rotor shaft of system that will be concaved with embedded hole is embedded in outward and carries out axle connection on this path axle.
In addition, also can connect this axle in the following manner and realize: be concaved with embedded hole in the outer end of this central shaft of central shaft that possesses the rotor that is formed with helical tooth and protrude in the outer end of at least one side on this rotor axis, and the rotor shaft of system in addition that will be equipped with the path axle be embedded in and carries out axle connection in this embedded hole.
In order to reach above-mentioned the 9th purpose, helical rotor of the present invention, be formed with plastic rotor around metal shaft is characterized in that:
Shaft portion at the coverage of synthetic resin material is provided with step and/or protuberance, and,
On the surface of above-mentioned covering shaft portion waveform groove or spiral chute are set,
With profile line form above-mentioned waveform groove or spiral fluted, by the section that the plane that comprises shaft centre line is dissectd, this profile line forms with the joint that smooth peak shape curve connects the circular-arc groove face of circular-arc groove face and adjacency.
Below according to accompanying drawing helical rotor embodiment of the present invention is described, in each critical piece that constitutes present embodiment, because contain in the present industry general technology of the present invention horizontal extent, can be carried out the parts of various modification to it by the colleague, so do not point out special reason, only do not allow according to the disclosed specified structure of the embodiment of the invention, main points of the present invention are limited and explain.
Description of drawings
Shown in Figure 1 is helical rotor the 1st embodiment's of the present invention sectional view.
Fig. 2 is the sectional view of state before expression the present invention the 1st embodiment's helical rotor axle connects.
Shown in Figure 3 is helical rotor the 2nd embodiment's of the present invention sectional view.
Shown in Figure 4 is helical rotor the 3rd embodiment's of the present invention sectional view.
Shown in Figure 5 is helical rotor the 4th embodiment's of the present invention sectional view.
Fig. 6 is an example of compressor or the concise and to the point sectional view at the existing main position of known water-jetting type screw compressor.
Shown in Figure 7 is helical rotor one embodiment's of the present invention sectional view and spiral fluted part amplification view.
Fig. 8 is other embodiments' of a helical rotor of the present invention sectional view.
Fig. 9 is another embodiment's of a helical rotor of the present invention side partial cross-sectional.
Figure 10 is other embodiments' of a helical rotor of the present invention side partial cross-sectional.
Figure 11 is the embodiment's different with the invention described above helical rotor a side partial cross-sectional.
Shown in Figure 12 is the side partial cross-sectional and the front elevation of an example of existing known helical rotor.
Embodiment
Below screw fluid machine of the present invention is described, be that example describes for ease of narration with the screw fluid machine.Following embodiment according to Fig. 1 to Fig. 5 describes.As depicted in figs. 1 and 2, helical rotor at least one outer end 2 extension on the axle of the rotor 1 that is formed with screw serrated form and this rotor 1 are provided with central shaft 3, (perhaps by around metal shaft, forming the central shaft 38 that plastic rotor possesses at least one side outer end on the rotor axis of protruding in), the outer end 4 of this central shaft 3 is provided with step, be equipped with path axle 5, and, rotor shaft 6 outer being embedded in that are concaved with the system in addition of embedded hole 7 are carried out the axle connection on this path axle 5.In this case, rotor shaft 6a, the embedded hole 7a that preferably similarly central shaft 3a same as described above, path axle 5a also is set, makes in addition at the other end 2a of rotor 1.And central shaft 3, the path axle 5 on the 3a, starting point 26,26a and the outermost end 27 of 5a, the 27a from being arranged at above-mentioned rotor 1 respectively to rotor end-face-rotor outer end 2, the length of 2a, is designed to roughly the same size in the two axial ends of clamping this rotor 1.Fig. 2 is the sectional view of state before expression helical rotor axle connects, and the position identical with Fig. 1 is marked with identical symbol, omits its explanation at this.
The following description of this invention, so-called rotor also comprise the rotor tooth portion that is formed with helical tooth.
In addition, as shown in Figure 3, above-mentioned axle connection also can be performed such: at least one outer end 8 in the rotor 1c that is formed with helical tooth and this rotor 1c axle center, extend central shaft 9 is set, be concaved with embedded hole 10 in the outer end of this central shaft 9, and the in addition rotor shaft 11 of system that will be equipped with path axle 12 is embedded in this embedded hole 10.In this case, equally also can adopt such axle connection means: preferably also on the 8a of the outer end of rotor 1c, be arranged with embedded hole 10a in the outer end of central shaft 9a same as described above, dash forward on the rotor shaft 11a of other system and establish path axle 12a, 12a is embedded among the above-mentioned embedded hole 10a with this path axle.In this case, preferably respectively from the starting point 28,28a and the inner terminal 29 that are arranged with embedded hole 10 on above-mentioned rotor 1c central shaft, 10a, 29a to the outer end 8 of rotor end-face-rotor, the length of 8a, all be designed to roughly the same size in the two axial ends of clamping this rotor 1c.
And a kind of means as the axle of the foregoing description connects are to make the aperture littler than the diameter of axle, and axial compression are gone in the embedded hole, or join with hot charging and to connect.In addition, processing feather key on hole and axle and carry out axle and is connected, perhaps the hole with spool on machining screw be threaded also passable again.
As shown in Figure 4, rotor 1d makes thermosetting plastic rotor make forming as one with it of metal center axle 13 on every side.And the 3rd embodiment's axle Placement is: at least one outer end 32 on the metallic central shaft 13 of this rotor 1d extends central shaft 15, be arranged with embedded hole 16 in the outer end of this central shaft 15, and the in addition rotor shaft 17 of system that will be equipped with path axle 18 is embedded in this embedded hole 16.The shape that the 4th embodiment's axle connects as shown in Figure 5, the axle ways of connecting also can be: at least one outer end 35 of the metal central shaft 19 of rotor 1e, extend the central shaft 20 that has covered synthetic resin on every side, be provided with step and be equipped with path axle 22 in the outer end 21 of this central shaft 20, and will be arranged with outside the embedded hole 24 of rotor shaft 23 ends of other system and be embedded on this path axle 22.And the 3rd and the 4th embodiment at its identical symbol subscript a, omits its explanation at this at the best also shaft connector of employing and Fig. 4, the identical structure of Fig. 5 of each outer end 32a, 35a.Also have, in this case, preferably also be respectively from the starting point 30,30a and the inner terminal 31 that are arranged with embedded hole 16 in above-mentioned each central shaft of rotor 1d, 16a, 31a to the outer end 32 of rotor, the length of 32a, length from the starting point 33,33a and the outermost end 34 that are arranged at path axle 22 on the above-mentioned rotor 1e central shaft, 22a, 34a to rotor outer end 35,35a respectively is in that respectively this rotor 1d, 1e two axial ends all are designed to roughly the same size respectively.In addition, these connection set makes the aperture littler than the diameter of axle, preferably, embedded hole is gone in axial compression, or also can on hole and axle, process spline as mentioned above embedded hole heating (also can cool off axle), carry out axle and connect, or the screw cutting employing is threaded on hole and axle.Also have, above-mentioned rotor also can adopt the synthetic resin with the rotor homogeneity to cover the wherein technological means of axle outer surface.
In above-mentioned the 1st to the 4th each embodiment, as the shape of the embedded hole and the path axle of shaft connector, can be circle, triangle, quadrilateral, polygonal etc., also can take different shapes in addition, end such as central shaft is arranged with embedded hole, establishes the path axle at another distal process.In addition, as shown in Figure 4, the synthetic resin of no use on every side that extends part of the metal central shaft 13 of rotor 1d covers, and central shaft 20 as shown in Figure 5, the metal central shaft 19 of rotor 1e extend part around be coated with synthetic resin, also can according to the metal center axle 19 of the rotor 1e that do not coexist of service condition extend part around coverage of synthetic resin not, and adopt metal central shaft 19, perhaps with synthetic resin cover rotor 1d metal central shaft 13 extend part around.
And, in any embodiment of Fig. 1 to Fig. 5, place, summary axle center at above-mentioned rotor shaft 6,6a, 11,11a, 17,17a, 23,23a is equipped with vent 25,25a ..., this vent connects the axle head to an opposite side with it from each embedded hole 7,7a, 10,10a, 16,16a, 24, the 24a that is arranged with on this rotor shaft or central shaft.In this case, so-called slightly axle center is meant each vent 25,25a ... any position of each embedded hole 7,7a, 10,10a, 16,16a, 24,24a is got final product with the position that outer gas is communicated with, be not geometric axle center, so the present invention is called slightly axle center (also can bore a hole in the axle center at the center on making).
In addition, the rotor shaft 6 that is connected with the outer embedding of centre of rotor axle, the material of 6a, 23,23a are metallic material, and the linear expansion coeffcient of this metallic material is littler than the linear expansion coeffcient of this central shaft material therefor.Also have, the used material of rotor center axle is a metallic material, and the linear expansion coeffcient of this metallic material is than little with the linear expansion coeffcient of the embedded rotor shaft that is connected 11 of this central shaft, 11a, 17,17a.
According to the compressor of Fig. 6, its action and main effect are described below.With the helical rotor that each embodiment's form and various shaft connector constituted, as shown in Figure 6, do not have the rotor shaft of rotor part and other system anything to change in appearance, the function of the helical rotor of its screw fluid machine is not variation also.Effect to various technique devices of the present invention describes below.Because rotor and axle are composite structure, so in order to realize the generalization of rotor (also comprising rotor tooth portion) size, can produce in batches with special-purpose working machine, the opposing party's over glaze is the processing separately of each minute unreeling, after machining respectively, by hot charging cooperation etc. both being connected is combined into the rotor of hope.The quality of processing of the helical rotor of finishing therefrom and performance are all very stable, and can reduce machining period and manufacture cost significantly.And because parts can be general, component management is also easy.
In addition, because central shaft is synthesized resin and covers, removing axle has the rust-proof effect, though fluid machinery in operation process, the micro-gap contingency that the axle of application chamber and bearing chamber seals contacts, also can sintering.
Moreover when the central shaft of helical rotor and rotor shaft cooperated, the air that remains in the portion of being arranged with can be gone to the outside from the vent that is arranged on the rotor shaft.Therefore, be arranged with can carrying out because of running and the air ventilation that temperature difference produced (respiration) when stopping of portion, connecting also can be very firm.
Because of being embedded in the material on the central shaft outward, its linear expansion coeffcient is littler than the expansion coefficient of embedded axle, so with the effect of the conduction heat that compression produced, make to cooperate and bind round tightlyer.Therefore can positively keep mated condition for a long time.And when long-term operation process rotor tooth portion or rotor shaft appearance wearing and tearing, when waiting, maintenance can only change these parts respectively.
It shown in Fig. 7 (a) the another embodiment's of helical rotor of the present invention simple sectional view.It among the figure amplification view of spiral chute or waveform groove.
Among the figure, make section diameter attenuate, be provided with step 47 on metal shaft 41 vertically, on the circumferential surface of thin footpath central shaft 38 that axial region constituted by this, the groove and the peak that are provided with grooved profile are circular-arc minor spiral groove 43, screw thread or waveform groove.Under the situation of present embodiment, spiral chute 43 is screw threads, even but many screw threads also can obtain same effect and effect.
Be the amplification view of spiral chute 43 shown in Fig. 7 (b), peak portion 44,44 ' interconnects the surface of the groove 43 ' of the groove 43 that possesses circular-arc R and adjacency, with radius r finishing peak portion 44,44 ', it is connected with spiral chute 43 surfaces with smooth curved surface, and on this circumferential surface, does not have corner angle.
The section of above-mentioned spiral chute 43 makes the finishing radius r of peak portion 44 different with the radius R of arc groove, for example shown in Fig. 7 (b), be minor radius, but shown in figure (c), also can make above-mentioned radius r that the length R same with arc groove arranged, this circular arc is directly connected mutually.
In addition, the shape of above-mentioned section also can be to be formed with the peak shape that connects with straight line between the circular arc r at groove and peak or to be roughly English thread shape [with reference to figure (d)].
Have, with reference to Fig. 7 (a), the sense of rotation when above-mentioned spiral chute 43 is this helical rotor running relatively is the spiral chute of counterrotating again.That is, when from the suction side axle head, under the dextrorotary situation of convex rotor, predeterminedly make spiral chute 43 to left hand screw, with the recessed rotor shaft of above-mentioned convex rotor engagement on be formed with the spiral chute of dextrorotation.
It is superficial that the degree of depth of the groove of spiral chute 43 (peak) is compared with the diameter of axle, for example compares with diameter to be about about 1%.The thermal shrinkage stress that this structure can produce the flute profile covering part of synthetic resin is controlled in the very little scope.
46 representatives cover the tooth of the synthetic resin system rotor 1f of axle 41.
The 47th, be arranged at the step on the axle 41, by the end thrust of above-mentioned step supporting rotor 1f.Concentrate for fear of stress, be provided with little R or chamfering etc. in the corner of step 47.
Present embodiment, in the material of the synthetic resin that covers axle 41 is to be under the situation of glass phenolic resin of main component with phenolic resin and glass fibre, because the linear expansion coeffcient of above-mentioned resin is similar to the linear expansion coeffcient of metal (being steel, cast iron) here, thus the compression function that adopts this rotor with its running and when stopping by the Stress Control that difference produced of axle 41 and rotor 1f thermal shrinking quantity in very little scope.
Rotor has more than with synthetic resin and is limited to above-mentioned glass phenolic resin, if synthetic resin satisfies characteristic such as mechanical strength and has the expansion coefficient approaching with the linear expansion coeffcient of shaft material, if little by using this synthetic resin just can the stress that produce because of thermal change be tried one's best, then without limits to its composition.
Shown in Figure 8 is another embodiment's of helical rotor of the present invention partial sectional view.
In the label that marks among the figure, the parts of the label representative identical with the record of Fig. 7 (a) are parts same as the previously described embodiments.
The diameter D4 that is provided with spiral chute 43 places that axle is coated with synthetic resin on 41 is than comprising the suction side and discharging the diameter of axle D3 (D4＞D3) slightly of the rotor shaft 36 of side, under the situation of present embodiment, increase the surface area of the part that spiral (waveform) groove 43 is set, strengthened the connection power between axle 41 and the rotor 1f.
This moment is because there is no need to be provided for processing the tool withdrawal groove of spiral chute 43, so needn't worry to reduce the intensity of axle 41 on axle 41.And the step 47 that is arranged between diameter of axle D4 and the diameter of axle D3 is used to support the required axial force of synthetic resin rotor 1f.As for the shape of step 47 as previously mentioned.
If present embodiment is at the end face that is spaced apart A2, rotor 1f of the periphery of the outer circumferential face of the central shaft 38 that is provided with spiral chute 43 and rotor 1f with when being provided with distance between the step 47 of axle 41 of spiral chute 43 and being A1, under the situation of A1=A2, synthetic resin rotor 1f after the shaping during cooling, because near the synthetic resin material the axle 41 has uniform rate of cooling, reduced the internal stress that rotor produces,, the possibility of crackle reduced so appearring in resin material.
Under the situation of present embodiment, the section shape of spiral chute 43 also can be implemented flute profile shown in Figure 7.
Shown in Figure 9 is the partial sectional view of another embodiment's of helical rotor of the present invention water-jetting type screw compressor, between suction side shaft envelope portion and discharge side shaft envelope portion, be provided with the step thinner than the diameter of axle of axle 41, this 41 rotor shaft 36 that comprises the suction side and discharge side is provided with spiral chute or waveform groove on the circumferential surface of thin footpath central shaft 38 that axial region constituted by this.
The length range L of step is set, preferably than suction side and the water of discharging side with the distance between the gland seal device, and than the suction side with to discharge the oil of side short with the distance between the gland seal device.And extend the synthetic resin that is formed with coverage of synthetic resin and cover axle 48, this synthetic resin covers axle 48 and is connected with the both ends of the surface of synthetic resin system rotor 1f, and has embedded gland seal device integratedly.
Label is identical with the mark of Fig. 7.
Under the situation of present embodiment, because that the range L that is provided with step obtains is very long,, increased the surface area of axle so it is very long that the axial length at spiral chute or waveform groove place is set, strengthened the degree that is connected of axle 41 and synthetic resin system rotor.In addition, embed on the axle of water with gland seal device because synthetic resin covers always, so promptly be used in the water-jetting type screw compressor, rotor and axle and other parts can not get rusty yet.
Shown in Figure 10 is other embodiments' of helical rotor of the present invention part section, and what mark in the label of note and Fig. 7～9 drawings is identical.
Under the situation of present embodiment, owing to make the axle covering part that constitutes axle envelope part synthetic resin material (be provided with spiral chute 43
1The place) diameter is thinner than the diameter of the axle covering part (being provided with spiral chute 43 places) of the synthetic resin material that forms rotor 1f, so between is provided with a plurality of steps 47, can guarantee to form the wall thickness of the synthetic resin material of an envelope portion, can prevent that crackle from appearring in this resin material.
In addition, owing to make spiral chute 43
1Groove depth more shallow than the groove depth of spiral chute 43, so that form the synthetic resin material of axle envelope portion crackle can not appear.
Above-mentioned groove is not limited to spiral chute, even the waveform groove effect is set too.
Present embodiment is because the diameter of axle covering part (being provided with spiral chute 43 places) is bigger and to be provided with the axial length at spiral chute place long, so a surface area that has increased spool can strengthen spools 41 and the join strength of synthetic resin.
Shown in Figure 11 is part section with above-mentioned different embodiment, and what mark among label and Fig. 7～Figure 10 is identical.
Present embodiment also can be described as the modification of rotor shaft shown in Figure 10, and the axle covering part of this epitrochanterian synthetic resin material is formed by mild curve, is provided with bulge in the central authorities of the length direction of axle 41, and this axle 41 comprises whole central shaft 38.
On circumferential surface, all be provided with waveform groove or spiral chute 43 on whole by the axle covering part that synthetic resin covered.
Present embodiment so there is not stress to concentrate, can reduce the crackle of resin material owing to support the axial force that is added on the rotor 1f by the arc surface dispersion of central shaft 38.
Though not expression among the figure, but make axle 41 by casting, if be coated with synthetic resin the axle 41 its casting surfaces remain untouched (but be attached to the surface molding sand to remove fully), process the words that covered resin material axle surface in addition by machining, then resin enters the place that is uneven of casting surface that cover with resin material, axle, the linkage structure between axle and the rotor can be strengthened, also machining period can be saved.
Effect of the present invention is as follows:
The the 1st or the 2nd, because the rotor of helical rotor and axle adopt combining structure, so as The measure-alike words of fruit rotor can be processed rotor in same manufacturing procedure, therefore Can boost productivity, keep stable crudy and component management also easy. In addition, Owing to adopt simple axle type of attachment, so in the multiple machinery of different axial lengths, can adopt Use same rotor, can not waste the helical rotor material, making to add does not need a lot of man-hours man-hour, Solved the problem that cost uprises, and because of axle can decompose, install easily, because axle can To do shortly, so can make the mechanical miniaturization of shaping usefulness. And, because as long as processing Go out a kind of axle, just also go for other machines, therefore, can reduce significantly manufacturing Cost. And, even concerning axle, will pass through surface treatment and other complicated manufacturing processes, Because parts itself are littler than rotor, so processing is also light, operation might as well. The 3rd, again Add the effect of the 1st or the 2nd any one, can prevent the assembly defect of rotor and armature spindle, Realize the generalization of processing component, can further reduce manufacturing cost.
The the 4th and the 5th, add the effect of the 1st to the 3rd any one, because the center Axle is covered by synthetic resin, as a kind of antirust countermeasure of axle, so that can hold very much Change places and only the part of necessity is carried out antirust processing or surface treatment, adopt resistant material also Be easy to.
The 6th, add the effect of the 1st to the 5th any one, owing to be equipped with ventilation The hole, this passage connects to its opposite side from being arranged with in the embedded hole of armature spindle or central shaft Axle head, can successfully embed when connecting because of axle, so insert that operation can be easy to and really Ground carries out, and be arranged with section, (exhale because running and the thermal gradient energy when stopping to cause circulation of air The suction effect).
The the 7th and the 8th, add the effect of the 1st to the 6th any one, because being embedded in outward The linear expansion coefficient of the material of central shaft is littler than the linear expansion coefficient of embedded axle, so with pressure Contracting effect and the heat by conduction role that produces is to make its cooperation bind round tightlyer can make it long Phase positively keeps mated condition.
The 9th, the present invention is because the periphery of the axle that covers at synthetic resin is provided with uses up Helicla flute or the waveform groove sliding curve connecting peak section and slot part section and form, decapacitation relaxes to be turned to The stress of sub-junction is concentrated, can prevent to produce at the bottom of the tooth from faying face to the helical rotor groove Be full of cracks can also prevent axle and rotor (synthetic resin part) disengaging between the two outside occurring, and And can strengthen chronically, keep its connection status.
The 10th, because axle is provided with step or bulge, retrain moving axially of rotor, Even suppose disengaging to have occurred owing to what reason makes between axle and the rotor, compressor is in running In the process, the housing inner face can not occur contacting and sintering equivalent damage accident with rotor end-face yet.
The 11st, be used in the situation of water-jetting type screw compressor the section that contacts with water Divide and can not get rusty fully, improved the reliability of gland seal device, can not mix in the air of discharge Enter rust and oil content. In addition, owing to preventing that sealing is blended into the lubricating oil that causes in the lubricating oil Deterioration and the appearance of emulsion, so can improve the life-span of bearing.
The 12nd, even the material of axle adopts steel and cast iron, the axle surface also needn't be carried out antirust With plating and coating process, in addition, shorten process time, energy with existing apparatus phase specific energy Produce cheap helical rotor.
The 13rd, helical rotor of the present invention is not limited in for the water-jetting type helical compression The rotor of machine also has following effect: even as oil-flooded screw compressor and no whelk The rotor that revolves the screw fluid machines such as compressor, screw vaccum pump or spiral expansion machine uses also Feasible.
Claims (13)
1. the axle construction of a helical rotor, it is characterized in that: in the helical rotor of screw fluid machine, comprise the rotor that is formed with helical tooth and protrude in the central shaft of the outer end of at least one side on this rotor axis, the outer end of this central shaft is provided with step, is equipped with the path axle, and the rotor shaft of system in addition that will be concaved with embedded hole is embedded in outward and carries out axle connection on this path axle.
2. the axle construction of a helical rotor, it is characterized in that: in the helical rotor of screw fluid machine, be concaved with embedded hole in the outer end of this central shaft of central shaft that comprises the rotor that is formed with helical tooth and protrude in the outer end of at least one side on this rotor axis, and the rotor shaft of system in addition that will be equipped with the path axle is embedded in and carries out axle connection in this embedded hole.
3. helical rotor axle construction as claimed in claim 1, it is characterized in that: path axle (5,5a) be based in the central shaft (3 of above-mentioned rotor (1), 3a), respectively from the path axle (5, starting point 5a) (26,26b) and outermost end (27,27a) (2, length 2a) all is designed to essentially identical size in this two axial ends to rotor end-face.
4. helical rotor axle construction as claimed in claim 2, it is characterized in that: the path aixs cylinder is located on the above-mentioned centre of rotor axle, embedded hole (10,10a) be arranged with in the central shaft (3 of described rotor (1), 3a), respectively from the starting point of described embedded hole (28,28a) and inner terminal (29,29a) (8, length 8a) all is designed to essentially identical size in the two axial ends of this rotor to rotor end-face.
5. as any 1 the described helical rotor axle construction in the claim 1 to 4, it is characterized in that: above-mentioned rotor makes thermosetting plastic rotor form as one with it around metal central shaft and makes.
6. the axle construction of a helical rotor is characterized in that: in the helical rotor of screw fluid machine,
Being coated with around on the metal shaft of synthetic resin, is to be provided with step on central shaft at least, and,
The surface that covers the axle of above-mentioned synthetic resin is provided with spiral chute or waveform groove,
With profile line form above-mentioned spiral chute or waveform groove, by the section that the plane that comprises shaft centre line is dissectd, this profile line forms with the joint that smooth peak shape curve connects the circular-arc groove face of circular-arc groove face and adjacency,
Above-mentioned spiral chute, its sense of rotation is opposite with the sense of rotation of helical rotor, and is formed with plastic rotor around metal axle.
7. the axle construction of a helical rotor is characterized in that: in the helical rotor of screw fluid machine,
Be coated with around on the metal shaft of synthetic resin, be provided with step and/or protuberance, and,
The surface of the axle of above-mentioned coverage of synthetic resin is provided with waveform groove or spiral chute,
With profile line form above-mentioned waveform groove or spiral fluted, by the section that the plane that comprises shaft centre line is dissectd, this profile line forms with the joint that smooth peak shape curve connects the circular-arc groove face of circular-arc groove face and adjacency.
8. helical rotor as claimed in claim 6 is characterized in that: in the axle surface coverage that is connected with plastic rotor synthetic resin is arranged, form between the axle envelope portion of the axle envelope portion of suction side of axle and discharge side, axial surface with synthetic resin at least.
9. helical rotor as claimed in claim 7 is characterized in that: in the axle surface coverage that is connected with plastic rotor synthetic resin is arranged, form between the axle envelope portion of the axle envelope portion of suction side of axle and discharge side, axial surface with synthetic resin at least.
10. as claim 6 or 8 described axle construction, it is characterized in that: above-mentioned rotor is to use the surface that covers, forms its central shaft periphery with rotor with the synthetic resin of material.
11. as claim 1 to 4,8, any 1 described axle construction of 9, it is characterized in that: basic for the place, axle center is equipped with vent at above-mentioned rotor shaft, this vent is from being arranged with embedded hole perforation on this rotor shaft or central shaft to the axle head of its opposite side.
12. as claim 1,3,4,8, any 1 described axle construction of 9, it is characterized in that: the material of the rotor shaft that the outer embedding of centre of rotor axle connects is a metallic material, and this metallic material has the linear expansion coeffcient character littler than the linear expansion coeffcient of this central shaft material therefor.
13. as claim 2 to 4,8, any 1 described axle construction of 9, it is characterized in that: the used material of centre of rotor axle is a metallic material, this metallic material have linear expansion coeffcient than with the little character of linear expansion coeffcient of the embedded rotor shaft that is connected of this central shaft.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09583096A JP3701378B2 (en) | 1996-03-27 | 1996-03-27 | Screw rotor |
| JP095830/96 | 1996-03-27 | ||
| JP095830/1996 | 1996-03-27 | ||
| JP27678196A JP3803812B2 (en) | 1996-09-12 | 1996-09-12 | Screw rotor |
| JP276781/96 | 1996-09-12 | ||
| JP276781/1996 | 1996-09-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1163354A CN1163354A (en) | 1997-10-29 |
| CN1112515C true CN1112515C (en) | 2003-06-25 |
Family
ID=26437002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97102933A Expired - Fee Related CN1112515C (en) | 1996-03-27 | 1997-03-04 | Shaft structure of screw rotor for screw fluid machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1112515C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104228291B (en) * | 2014-08-08 | 2017-01-11 | 苏州苏净船用机械有限公司 | Tool for coating heavy propeller shaft by using glass fiber reinforced plastics |
| CN110285054A (en) * | 2019-06-14 | 2019-09-27 | 泉州市华德机电设备有限公司 | A kind of water lubrication screw air compressor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0101345A1 (en) * | 1982-07-22 | 1984-02-22 | BENDIX France | Screw compressor |
| US4764098A (en) * | 1985-07-26 | 1988-08-16 | Toyota Jidosha Kabushiki Kaisha | Roots type pump with pin connection for plastic coated rotor |
| EP0398675A2 (en) * | 1989-05-18 | 1990-11-22 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Rotor |
| US5211026A (en) * | 1991-08-19 | 1993-05-18 | American Standard Inc. | Combination lift piston/axial port unloader arrangement for a screw compresser |
-
1997
- 1997-03-04 CN CN97102933A patent/CN1112515C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0101345A1 (en) * | 1982-07-22 | 1984-02-22 | BENDIX France | Screw compressor |
| US4764098A (en) * | 1985-07-26 | 1988-08-16 | Toyota Jidosha Kabushiki Kaisha | Roots type pump with pin connection for plastic coated rotor |
| EP0398675A2 (en) * | 1989-05-18 | 1990-11-22 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Rotor |
| US5211026A (en) * | 1991-08-19 | 1993-05-18 | American Standard Inc. | Combination lift piston/axial port unloader arrangement for a screw compresser |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1163354A (en) | 1997-10-29 |
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