CN108375250B - Electric valve and refrigeration cycle system - Google Patents
Electric valve and refrigeration cycle system Download PDFInfo
- Publication number
- CN108375250B CN108375250B CN201810019632.0A CN201810019632A CN108375250B CN 108375250 B CN108375250 B CN 108375250B CN 201810019632 A CN201810019632 A CN 201810019632A CN 108375250 B CN108375250 B CN 108375250B
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- fixing member
- rotor shaft
- cylindrical portion
- valve
- cylindrical
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 15
- 238000003466 welding Methods 0.000 claims abstract description 39
- 238000003780 insertion Methods 0.000 claims abstract description 29
- 230000037431 insertion Effects 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000004048 modification Effects 0.000 description 23
- 238000012986 modification Methods 0.000 description 23
- 229910001220 stainless steel Inorganic materials 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 8
- 239000003507 refrigerant Substances 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
- F25B2341/06—Details of flow restrictors or expansion valves
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- Electrically Driven Valve-Operating Means (AREA)
- Lift Valve (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention provides an electric valve and a refrigeration cycle system, wherein the electric valve (100) properly welds and fixes a fixing component (23) of a magnetic rotor (2) and a rotor shaft (1). A fixing member (23) is provided at the center of the magnetic rotor (2). A fixing member (23) is formed by a cylindrical fixing member body (231) and a cylindrical barrel (232). The cylindrical portion (232) is formed to have a diameter smaller than that of the fixing member main body portion (231). The volume of the cylindrical part (232) is made smaller than that of the fixing member main body part (231). An insertion hole (23a) through which the rotor shaft (1) (the first shaft part (11)) is inserted is provided in the center of the fixing member (23). The fixing member (23) and the rotor shaft (1) are welded locally at two locations (one portion) around the axis (L) at the open end of the fixing member (23) on the cylindrical portion (232) side of the insertion hole (23 a). Two melt-solidified portions (4, 4) produced by welding are formed to a suitable depth.
Description
Technical Field
The present invention relates to an electrically operated valve used in a refrigeration cycle system or the like and a refrigeration cycle system.
Background
Conventionally, as such an electrically operated valve, a rotor shaft is translated via a screw feed mechanism by rotation of a magnetic rotor of a stepping motor, and a valve port is opened and closed by a valve member coupled to the rotor shaft. Such an electrically operated valve is disclosed in, for example, japanese patent laid-open nos. 2016 and 156447 (patent document 1) and 2015 and 90204 (patent document 2).
In the conventional motor-driven valve of patent document 1, as a structure for fixing the magnetic rotor and the valve shaft (rotor shaft), the valve shaft is inserted through a coupling body (fixing member) provided at a shaft core portion of the magnetic rotor, and the coupling body and the valve shaft are fixed by welding or the like.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-
Patent document 2: japanese patent laid-open publication No. 2015-90204
Disclosure of Invention
Problems to be solved by the invention
As described above, when the coupling body (fixing member) provided in the shaft core portion of the magnetic rotor and the valve shaft (rotor shaft) are fixed by welding, it is required to set the respective heat capacities of the coupling body and the valve shaft in an appropriate relationship. For example, when the heat capacity of the valve shaft is smaller than that of the coupling body, excessive welding heat may be applied to the valve shaft, and the valve shaft may be deformed. Further, the valve shaft may be melted first, and the connecting member may be insufficiently melted, so that sufficient fixing strength may not be obtained, and the connecting member may be detached from the valve shaft.
The present invention addresses the problem of providing an electrically operated valve in which a motor section rotates a magnetic rotor and a rotor shaft, and a valve port is opened and closed by the forward and backward movement of a valve member in accordance with the rotation of the rotor shaft, and in which a fixing member of the magnetic rotor and the rotor shaft are fixed by welding, thereby preventing deformation of the rotor shaft and improving the fixing strength.
Means for solving the problems
The invention described in claim 1 is an electrically operated valve in which a motor section rotates a magnetic rotor and a metallic rotor shaft, and a valve port is opened and closed by forward and backward movement of a valve member in accordance with the rotation of the rotor shaft, the electrically operated valve being characterized in that the magnetic rotor includes: a magnet body having magnetic properties; and a metal fixing member formed integrally with the magnet main body at a center of the magnet main body, the fixing member having a fixing member main body portion and a cylindrical portion, and being provided with an insertion hole penetrating the fixing member main body portion and the cylindrical portion in an axial direction of the rotor shaft, wherein the fixing member main body portion is coupled to the magnet main body by the integral molding, the cylindrical portion has a diameter smaller than an outer diameter of the fixing member main body portion and a volume smaller than a volume of the fixing member main body portion, the rotor shaft is inserted through the insertion hole, and the cylindrical portion and a part of the rotor shaft around an opening end portion of the insertion hole are fixed by welding.
The motor-operated valve according to claim 1 of claim 2 is characterized in that the opening end portion of the insertion hole of the cylindrical portion and the rotor shaft are welded at a plurality of positions around the axis of the rotor shaft, and each melt-solidified portion is formed by the welding.
The motor-operated valve according to any one of claims 1 to 3, wherein the inner diameter corner of the opening end of the cylindrical portion has a shape of a rim in contact with the outer periphery of the rotor shaft, or a slightly chamfered shape having a C0.1 or less.
The electrically operated valve according to any one of claims 1 to 4, wherein the rotor shaft and the fixing member are made of the same material.
The electrically operated valve according to claim 6 of any one of claims 1 to 5, wherein the fixing member main body portion has a cylindrical shape, and a dimension of the fixing member main body portion in the axial direction is larger than a dimension of the cylindrical portion in the axial direction.
Claim 7 is the electrically operated valve according to any one of claims 1 to 6, wherein when the diameter of the rotor shaft is D, the radial thickness of the cylindrical portion is t, and the dimension of the cylindrical portion in the axial direction is H, t < D/2, and H/t is equal to or greater than 1.
The refrigeration cycle system according to claim 8 is characterized in that the motor-operated valve according to any one of claims 1 to 7 is used as the expansion valve, and the refrigeration cycle system includes a compressor, a condenser, an expansion valve, and an evaporator.
Effects of the invention
According to the motor-operated valve of claims 1 to 7, the cylindrical portion having a smaller diameter than the outer diameter of the fixing member main body portion, a smaller volume, and a smaller heat capacity is not welded all around, but is welded locally, so that it is possible to weld so as to suppress the occurrence of excessive welding heat during welding, and the amount of fusion-in can be increased in a range where deformation of the rotor shaft due to welding heat is not caused, so that the local strength contributes to an improvement in the overall joint strength, and the magnetic rotor (a part of the fixing member thereof) does not fall off from the rotor shaft. Further, since the outer diameter of the fixing member main body portion coupled to the magnet main body is larger than the cylindrical portion joined by welding, when the magnetic rotor rotates, the torque of the magnet main body can be easily transmitted to the fixing member main body portion, and the fixing member does not fall off from the magnet main body.
According to the motor-operated valve of claim 4, since the inner diameter corner portion of the upper end of the cylindrical portion is formed in the shape of a rim or a slight chamfered shape of C0.1 or less, a gap between the end portion of the fixing member (cylindrical portion) and the rotor shaft is reduced, and even if there is member variation or welding variation, weldability can be improved, and fixing strength can be further improved.
According to the motor-operated valve of claim 5, since the rotor shaft and the fixing member are made of the same material, the heat conductivity is the same, and the rotor shaft and the fixing member are uniformly melted, thereby further improving the fixing strength. For example, the rotor shaft does not melt first.
According to the motor-operated valve of claim 6, the fixing member main body portion has a cylindrical shape, and the dimension of the fixing member main body portion in the axial direction is larger than the dimension of the cylindrical portion in the axial direction. Therefore, the heat capacity of the fixing member main body can be sufficiently ensured, and the influence of the welding heat on the magnet main body can be suppressed.
According to the refrigeration cycle system of aspect 8, the same effects as those of aspects 1 to 7 can be obtained.
Drawings
Fig. 1 is a longitudinal sectional view of an electrically operated valve according to an embodiment of the present invention.
Fig. 2 is an enlarged cross-sectional view of a main portion of a magnetic rotor and a rotor shaft of the motor-operated valve according to the embodiment.
Fig. 3 is a view from a-a of fig. 2.
Fig. 4 is a sectional view and a partially enlarged view of B-B of fig. 2.
Fig. 5(a) to (C) are views showing a modification 1 of the fixing member of the embodiment.
Fig. 6(a) to (C) are views showing a modification 2 of the fixing member of the embodiment.
Fig. 7(a) to (C) are views showing modification 3 of the fixing member of the embodiment.
Fig. 8 is a diagram showing a refrigeration cycle system according to an embodiment.
In the figure:
1-a rotor shaft, 1 a-an external thread portion, 2-a magnetic rotor, 21-a magnet portion (magnet body), 22-a disc portion (magnet body), 22 a-a boss portion, 23-a fixing member, 23 a-an insertion hole, 231-a fixing member body portion, 232-a cylindrical portion, 25-a fixing member, 251-a fixing member body portion, 252-a cylindrical portion, 25 a-an insertion hole, 26-a fixing member, 261-a fixing member body portion, 262-a cylindrical portion, 26 a-an insertion hole, 27-a fixing member, 271-a fixing member body portion, 272-an insertion hole, 3-a stator unit, 4-a melt-setting portion, 10-a stepping motor (motor portion), 40-a valve housing, 41-a first joint pipe, 42-a second joint pipe, 43-a cylindrical portion, 43a valve seat, 50-a valve mechanism portion, 51-a support member, 52-a valve holder, 53-a needle valve (pin member), 51 a-female screw portion, 100-electric valve (expansion valve), 200-outdoor heat exchanger, 300-indoor heat exchanger, 400-flow path switching valve, 500-compressor, L-axis.
Detailed Description
Next, embodiments of an electric valve and a refrigeration cycle system according to the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view of an electric valve according to an embodiment, fig. 2 is an enlarged sectional view of a main portion of a magnetic rotor and a rotor shaft of the electric valve according to the embodiment, fig. 3 is a view taken along a-a in fig. 2, and fig. 4 is a sectional view taken along B-B in fig. 2 and a partially enlarged view. Note that the concept of "up and down" in the following description corresponds to up and down in the drawing of fig. 1.
The motor-operated valve 100 includes a stepping motor 10 as a "motor unit", a valve housing 40, a valve mechanism unit 50, and a sealed housing 60 made of a nonmagnetic material.
The stepping motor 10 includes a rotor shaft 1, a magnetic rotor 2 rotatably disposed inside a sealed casing 60, and a stator unit 3 disposed on the outer periphery of the sealed casing 60 so as to face the magnetic rotor 2. As will be described later, the rotor shaft 1 is attached to the center of the magnetic rotor 2, and the rotor shaft 1 extends toward the valve mechanism portion 50. The stator unit 3 includes a resin bobbin 31, a pair of upper and lower stator coils 32 wound around the bobbin 31, and a yoke (yoke) 33 made of a magnetic material. The outer peripheral end of the yoke 33 is fitted into the cylindrical sleeve 34, and the yoke 33 and the cylindrical sleeve 34 are sealed by a resin outer seal 35.
The valve housing 40 is formed of stainless steel or the like into a substantially cylindrical shape, and has a valve chamber 40R inside thereof. A first joint pipe 41 that communicates with the valve chamber 40R is connected to the outer peripheral side of the valve housing 40, and a second joint pipe 42 is connected to a cylindrical portion that extends downward from the lower end. Further, a valve seat 43 is fitted to the valve chamber 40R side of the second joint pipe 42. The upper end inside of the seat ring 43 forms a valve port 43a, and the second joint pipe 42 is communicated with the valve chamber 40R through the valve port 43 a. The first joint pipe 41, the second joint pipe 42, and the valve seat ring 43 are fixed to the valve housing 40 by brazing or the like.
The valve mechanism portion 50 has a support member 51, a valve frame 52, and a needle valve 53 as a "valve member". The support member 51 is made of, for example, a synthetic resin, is formed into a substantially cylindrical shape, and is fixed to the upper end portion of the valve housing 40 by welding or the like via a flange portion 511 made of stainless steel, which is integrally provided on the outer periphery thereof by insert molding. A female screw portion 51a coaxial with the axis L of the rotor shaft 1 and a screw hole thereof are formed at the center of the support member 51, and a cylindrical guide hole 51b having a larger diameter than the screw hole of the female screw portion 51a is formed.
The valve frame 52 is a cylindrical member, is fitted into the guide hole 51b, and is disposed slidably in the direction of the axis L. A needle valve 53 is fixed to a lower end portion of the valve frame 52. A spring seat 52a is provided in the valve frame 52 so as to be movable in the direction of the axis L, and a compression coil spring 52b is attached between the spring seat 52a and the needle valve 53 in a state where a predetermined load is applied.
A male screw portion 1a is formed on the outer periphery of the rotor shaft 1 on the support member 51 side, and the male screw portion 1a is screwed to the female screw portion 51a of the support member 51. In the guide hole 51b of the support member 51, the upper end portion of the valve holder 52 is engaged with the lower end portion of the rotor shaft 1, and the valve holder 52 and the needle valve 53 are rotatably supported by the rotor shaft 1.
The hermetic case 60 is formed in a substantially cylindrical shape with its upper end closed, and is hermetically fixed to the upper end of the valve case 40 by welding or the like. A guide holding cylinder 61 is fitted into an upper portion of the inside of the sealed case 60, and a guide 62 is fitted into a central cylindrical portion 61a of the guide holding cylinder 61. The guide 62 has a guide hole 62a at the center, and the upper end of the rotor shaft 1 is rotatably fitted into the guide hole 62 a. A spiral guide wire body 63 is attached to the outer periphery of the cylindrical portion 61a, and a movable stopper member 64 screwed to the spiral guide wire body 63 is provided.
According to the above configuration, the magnetic rotor 2 and the rotor shaft 1 are rotated by the driving of the stepping motor 10, and the rotor shaft 1 is moved in the axis L direction by the screw feeding mechanism of the male screw portion 1a of the rotor shaft 1 and the female screw portion 51a of the support member 51. Then, the needle 53 is moved in the direction of the axis L to approach or separate from the valve seat ring 43. Thereby, the opening/closing valve port 43a controls the flow rate of the refrigerant flowing from the first joint pipe 41 to the second joint pipe 42 or from the second joint pipe 42 to the first joint pipe 41.
Further, the magnetic rotor 2 is provided with a protrusion 24, and the protrusion 24 pushes the movable stopper member 64 with the rotation of the magnetic rotor 2, so that the movable stopper member 64 moves up and down while rotating by being screwed to the screw of the spiral guide wire 63. Then, the movable stopper member 64 comes into contact with the lower end stopper 63a of the helical guide wire body 63, thereby obtaining a rotation stopper function of the lowermost end position of the rotor shaft 1. The movable stopper member 64 is in contact with the upper end stopper 61b of the guide holding cylinder 61, thereby obtaining a rotation stopper function of the uppermost position of the rotor shaft 1.
In this way, the motor-operated valve 100 is an electric valve in which the stepping motor 10 (motor unit) rotates the magnetic rotor 2 and the metallic rotor shaft 1, and the valve port 43a is opened and closed by the forward and backward movement of the needle valve 53 in accordance with the rotation of the rotor shaft 1.
The rotor shaft 1 is formed by machining a rod member made of stainless steel, and includes a first shaft portion 11 positioned above the support member 51 and a second shaft portion 12 having a larger diameter than the first shaft portion 11. The male screw portion 1a is formed in a portion of the second shaft portion 12 through which the support member 51 is inserted. Further, due to the difference in diameter between the first shaft portion 11 and the second shaft portion 12, a stepped surface portion 13 extending from the axial line L side of the rotor shaft 1 to the outer diameter direction of the second shaft portion 12 and forming a surface perpendicular to the axial line L of the rotor shaft 1 is provided at the boundary portion between the first shaft portion 11 and the second shaft portion 12.
The magnetic rotor 2 includes a cylindrical magnet portion 21 having an outer peripheral portion magnetized in multiple poles, a disk portion 22 extending substantially at a center portion in the direction of the axis L in the magnet portion 21, a fixing member 23 provided in a boss portion 22a at the center of the disk portion 22 and functioning as a hub, and the protrusion portion 24. The magnet portion 21, the disk portion 22, and the protrusion portion 24 constitute a "magnet main body" as an integrally molded component made of PPS or the like, and the magnet portion 21 is molded by adding magnetic powder to PPS or the like as a base material. The fixing member 23 is made of stainless steel of the same material as the rotor shaft 1, and the fixing member 23 is integrally molded by insert molding together with the magnet portion 21 and the disk portion 22 (the boss portion 22a thereof).
The fixing member 23, which is a part of the magnetic rotor 2, is formed to have a cylindrical fixing member body 231 and a cylindrical portion 232 having a smaller diameter than the fixing member body 231 and a cylindrical shape, and the fixing member body 231 and the cylindrical portion 232 are coaxial with each other with the axis L as a central axis. The fixing member 23 has a cylindrical insertion hole 23a through which the fixing member body 231 and the cylindrical portion 232 pass in the direction of the axis L. The surface of the fixing member 23 on the side of the support member 51 extends outward from the axis L than the inner circumferential surface of the insertion hole 23a, and this surface serves as a contact surface portion 23b that can contact the stepped surface portion 13 of the rotor shaft 1.
The magnetic rotor 2 is inserted with the rotor shaft 1 (the first shaft portion 11) into the insertion hole 23a of the fixing member 23, and the abutment surface portion 23b of the fixing member 23 is brought into abutment with the stepped surface portion 13 of the rotor shaft 1. This positions the magnetic rotor 2 in the direction of the axis L of the rotor shaft 1. Then, the rotor shaft 1 and the cylindrical portion 232 are fixed by welding at two locations (a part) around an opening end portion a (two-dot chain line in fig. 2) of the insertion hole 23a of the fixing member 23 on the cylindrical portion 232 side, and two melt-solidified portions 4, 4 are formed by the welding. As shown in fig. 3, the melt-solidified portions 4 and 4 are formed in the range of 45 ° to 90 ° around the axis L. Since the welding method is laser welding, for example, a laser spot is irradiated to a boundary portion between the opening end of the insertion hole 23a and the rotor shaft 1. At this time, the output (intensity) of the laser light is adjusted so that the depth of the melt-solidified portion 4 becomes a depth at which the rotor shaft 1 and the fixing member 23 can be reliably fixed.
In this way, the fixing member 23 has a fixing member body 231 that is coupled to the magnet portion 21 and the disk portion 22 (magnet body) by integral molding by insert molding. The fixing member 23 has a cylindrical portion 232 having a diameter smaller than the outer diameter of the fixing member body 231 and a volume smaller than the volume of the fixing member body 231. Then, the rotor shaft 1 is inserted into the insertion hole 23a, and the cylindrical portion 232 and a part of the rotor shaft 1 around the opening end portion of the insertion hole 23a are fixed by welding. That is, the cylindrical portion 232 having a smaller diameter than the outer diameter of the fixing member body 231, a smaller volume, and a smaller heat capacity is partially welded, not welded all around. Therefore, it is possible to suppress the generation of excessive welding heat at the time of welding. This can increase the amount of fusion in a range where deformation of the rotor shaft 1 due to welding heat does not occur. Therefore, the local strength by the melt-solidified portions 4 and 4 contributes to an improvement in the overall joining strength, and the magnetic rotor 2 (fixing member 23) does not fall off from the rotor shaft 1. Further, since the outer diameter of the fixing member main body 231 is larger than the cylindrical portion 232 joined by welding, when the magnetic rotor 2 rotates, the torque of the magnet main body can be easily transmitted to the fixing member main body 231, and the fixing member 23 does not fall off from the magnet main body.
The opening end of the insertion hole 23a and the rotor shaft 1 are welded to two opposite positions of the rotor shaft 1 around the axis L, and the respective melt-solidified portions 4, 4 formed by welding are formed within a range of 45 ° to 90 ° around the axis L. Therefore, welding can be performed so as to suppress the generation of excessive welding heat.
As shown in the enlarged partial view of the dotted circle in fig. 4, the inner diameter corner of the insertion hole 23a at the upper end of the cylindrical portion 232 on the rotor shaft 1 side has a slightly chamfered shape of C0.1 or less. Therefore, the gap between the end of the cylindrical portion 232 of the fixing member 23 and the rotor shaft 1 is reduced, and the weldability between the fixing member 23 and the rotor shaft 1 can be improved even if there are component variations and welding variations, thereby further improving the fixing strength. The inner diameter corner of the insertion hole 23a on the rotor shaft 1 side may have a brim shape.
Since the rotor shaft 1 and the fixing member 23 are made of stainless steel and made of the same material, the thermal conductivity is the same, and the rotor shaft 1 and the fixing member 23 are melted to the same extent, thereby further improving the fixing strength.
The fixing member body 231 has a cylindrical shape, and the dimension of the fixing member body 231 in the direction of the axis L is larger than the dimension of the cylindrical portion 232 in the direction of the axis L. Therefore, the heat capacity of the fixing member body 231 can be sufficiently ensured, and the influence of the welding heat on the "magnet body" in which the magnet portion 21 and the disk portion 22 are integrated can be suppressed.
Further, as shown in FIG. 2, when the diameter of the first shaft part 11 of the rotor shaft 1 is D, the radial thickness of the cylindrical part 232 is t, and the dimension (height) of the cylindrical part 232 in the direction of the axis L is H, t < D/2, and H/t ≧ 1. This makes the heat capacity of the cylindrical portion 232 suitable for welding with respect to the heat capacity of the rotor shaft 1, thereby improving weldability and fixing strength.
Fig. 5 is a view showing modification 1 of the fixing member. In fig. 5 to 7 corresponding to modifications 1 to 3 below, (a) is a plan view of the fixing member, (B) is a vertical sectional view of the fixing member, and (C) is a side view of the fixing member. The magnetic rotor 2 is not shown, and only the boss 22a is shown by a dashed-dotted line in a vertical cross-sectional view. The fixing member 25 of modification 1 is made of stainless steel of the same material as the rotor shaft 1, and is integrally molded by insert molding together with the magnet portion 21 and the disk portion 22 (the boss portion 22 a). The fixing member 25 of modification 1 is formed to have a cylindrical fixing member body 251 and a cylindrical portion 252 having a smaller diameter than the fixing member body 251 and a cylindrical shape, and has a cylindrical insertion hole 25a through which the rotor shaft 1 is inserted. The fixing member body 251 of modification 1 has the same shape as the fixing member body 231, and the cylindrical portion 252 has a smaller diameter than the cylindrical portion 232.
Fig. 6 is a view showing modification 2 of the fixing member. The fixing member 26 of modification 2 is made of stainless steel of the same material as the rotor shaft 1, and is integrally molded by insert molding together with the magnet portion 21 and the disk portion 22 (the boss portion 22a thereof). The fixing member 26 of modification 2 is formed to have a substantially cylindrical fixing member body portion 261 and a cylindrical portion 262 having a smaller diameter than the fixing member body portion 261 and a cylindrical insertion hole 26a through which the rotor shaft 1 is inserted. The fixing member body 261 of modification 2 has the same diameter as the fixing member body 231, but has concave grooves 261a at four positions on the outer periphery. The cylindrical portion 262 has the same shape as the cylindrical portion 252 of modification 1. The size and shape of the groove 261a are not limited to those in the drawings, and may be small or large, and the groove position is not limited to four positions, and may be four or more or four or less.
Fig. 7 is a diagram showing modification 3 of the fixing member. The fixing member 27 of modification 3 is made of stainless steel of the same material as the rotor shaft 1, and is integrally molded by insert molding together with the magnet portion 21 and the disk portion 22 (the boss portion 22a thereof). The fixing member 27 of modification 3 is formed to have a quadrangular prism-shaped fixing member body 271 and a cylindrical portion 272 having a smaller diameter than the fixing member body 271 and a cylindrical shape, and has a cylindrical insertion hole 27a through which the rotor shaft 1 is inserted. The maximum diameter portion of the fixing member body 271 of modification 3 is the same diameter as the fixing member body 231. The cylindrical portion 272 has the same shape as the cylindrical portion 252 of modification 1.
As shown in fig. 5(B), 6(B), and 7(B), in these modifications 1 to 3, the respective melt-solidified portions 4 and 4 by welding are formed at two locations of the rotor shaft 1 facing each other around the axis L. In these modifications 1 to 3, the cross-sectional shapes of the fixing member main bodies 251, 261, 271 are the same, and the maximum outer diameters thereof are the same. However, the volumes of the fixing member main bodies 251, 261, and 271 are different from each other.
In addition, the volumes of the fixing member main body portions 231, 251, 261, 271 in the above embodiments and modifications 1 to 3 are preferably three times or more the volumes of the cylindrical portions 232, 252, 262, 272, respectively. The shape of the fixing member body may be other shapes, for example, a triangular shape, a pentagonal shape, and other prismatic shapes.
In the embodiment and the modifications, the example in which the welding is performed at two locations opposed to each other around the axis L of the rotor shaft 1 has been described, but the welding location may be one location around the axis L. In this case, the melt-solidified portion is preferably formed in a range of 150 ° to 270 ° around the axis. The welding portion may be a plurality of portions (for example, three or more portions) around the axis L, not limited to two portions facing each other around the axis L and one portion around the axis L. In this case, the welding portion is preferably formed at a position rotationally symmetrical about the axis L, and the angle at which each of the melt-solidified portions is formed about the axis L may be smaller than 45 °.
Fig. 8 is a diagram showing a refrigeration cycle system according to an embodiment. In the figure, reference numeral 100 denotes an electrically operated valve constituting an "expansion valve" according to an embodiment of the present invention, reference numeral 200 denotes an outdoor heat exchanger mounted in an outdoor unit, reference numeral 300 denotes an indoor heat exchanger mounted in an indoor unit, reference numeral 400 denotes a flow path switching valve constituting a four-way valve, and reference numeral 500 denotes a compressor. The motor-operated valve 100, the outdoor heat exchanger 200, the indoor heat exchanger 300, the flow path switching valve 400, and the compressor 500 are connected by pipes as shown in the figure, and constitute a heat pump type refrigeration cycle. Note that the reservoir, the pressure sensor, the temperature sensor, and the like are not illustrated.
The flow path of the refrigeration cycle is switched by the flow path switching valve 400 to two flow paths, i.e., a cooling operation flow path and a heating operation flow path. During the cooling operation, as shown by solid arrows in the figure, the refrigerant compressed by the compressor 500 flows from the flow path switching valve 400 into the outdoor heat exchanger 200, the outdoor heat exchanger 200 functions as a condenser, the liquid refrigerant flowing out of the outdoor heat exchanger 200 flows into the indoor heat exchanger 300 via the electric valve 100, and the indoor heat exchanger 300 functions as an evaporator.
On the other hand, during the heating operation, as indicated by the broken line arrows in the figure, the refrigerant compressed by the compressor 500 circulates from the flow path switching valve 400 to the indoor heat exchanger 300, the motor-operated valve 100, the outdoor heat exchanger 200, the flow path switching valve 400, and the compressor 500 in this order, and the indoor heat exchanger 300 functions as a condenser and the outdoor heat exchanger 200 functions as an evaporator. The motor-operated valve 100 decompresses and expands the liquid refrigerant flowing from the outdoor heat exchanger 200 during the cooling operation or the liquid refrigerant flowing from the indoor heat exchanger 300 during the heating operation, and further controls the flow rate of the refrigerant.
Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and modifications of design and the like without departing from the scope of the present invention also belong to the present invention.
Claims (6)
1. An electrically operated valve in which a motor section rotates a magnetic rotor and a metallic rotor shaft and a valve port is opened and closed by the forward and backward movement of a valve member in accordance with the rotation of the rotor shaft,
the above-mentioned electric valve is characterized in that,
the magnetic rotor includes: a magnet body having magnetic properties; and a metal fixing member formed integrally with the magnet body at the center of the magnet body,
wherein the fixing member is formed to have a fixing member body portion and a cylindrical portion, and an insertion hole penetrating the fixing member body portion and the cylindrical portion in an axial direction of the rotor shaft is provided, wherein the fixing member body portion is coupled to the magnet body by the integral molding, the cylindrical portion has a diameter smaller than an outer diameter of the fixing member body portion and a volume smaller than a volume of the fixing member body portion, and the volume of the fixing member body portion is three times or more the volume of the cylindrical portion,
the rotor shaft is inserted into the insertion hole, and the cylindrical portion and a part of the rotor shaft around an opening end of the insertion hole are fixed by welding,
the inner diameter corner of the opening end of the cylindrical portion has a slightly chamfered shape with a diameter of C0.1 or less,
the opening end of the insertion hole of the cylindrical portion and the rotor shaft are welded to each other at a plurality of positions of the rotor shaft that are rotationally symmetrical about the axis, and each melt-solidified portion generated by the welding is formed within an angular range of 90 ° or less about the axis.
2. Electrically operated valve according to claim 1,
the opening end of the insertion hole of the cylindrical portion and the rotor shaft are welded to each other at two locations opposed to each other around the axis of the rotor shaft, and each melt-solidified portion formed by the welding is formed within a range of 45 ° to 90 ° around the axis.
3. Electrically operated valve according to claim 1 or 2,
the rotor shaft and the fixing member are made of the same material.
4. Electrically operated valve according to claim 1 or 2,
the fixing member body portion has a cylindrical shape, and a dimension of the fixing member body portion in the axial direction is larger than a dimension of the cylindrical portion in the axial direction.
5. Electrically operated valve according to claim 1 or 2,
when the diameter of the rotor shaft is D, the radial thickness of the cylindrical portion is t, and the dimension of the cylindrical portion in the axial direction is H, t < D/2, H/t is not less than 1.
6. A refrigeration cycle system comprises a compressor, a condenser, an expansion valve and an evaporator,
the above-described refrigeration cycle system is characterized in that,
use of an electrically operated valve according to any of claims 1 to 5 as the above expansion valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011612736.6A CN112781282A (en) | 2017-01-31 | 2018-01-09 | Electric valve and refrigeration cycle system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017016004A JP6726116B2 (en) | 2017-01-31 | 2017-01-31 | Motorized valve and refrigeration cycle system |
| JP2017-016004 | 2017-01-31 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011612736.6A Division CN112781282A (en) | 2017-01-31 | 2018-01-09 | Electric valve and refrigeration cycle system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108375250A CN108375250A (en) | 2018-08-07 |
| CN108375250B true CN108375250B (en) | 2021-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011612736.6A Pending CN112781282A (en) | 2017-01-31 | 2018-01-09 | Electric valve and refrigeration cycle system |
| CN201810019632.0A Active CN108375250B (en) | 2017-01-31 | 2018-01-09 | Electric valve and refrigeration cycle system |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011612736.6A Pending CN112781282A (en) | 2017-01-31 | 2018-01-09 | Electric valve and refrigeration cycle system |
Country Status (2)
| Country | Link |
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| JP (1) | JP6726116B2 (en) |
| CN (2) | CN112781282A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7349514B2 (en) * | 2019-09-27 | 2023-09-22 | 浙江盾安人工環境股▲ふん▼有限公司 | electronic expansion valve |
| JP7157105B2 (en) * | 2020-06-25 | 2022-10-19 | 株式会社鷺宮製作所 | Electric valve and refrigeration cycle system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011204317A (en) * | 2010-03-25 | 2011-10-13 | Seiko Instruments Inc | Rolling bearing device and pivot device |
| CN104676071A (en) * | 2013-11-07 | 2015-06-03 | 株式会社鹭宫制作所 | Electric valve |
| CN105909804A (en) * | 2015-02-24 | 2016-08-31 | 株式会社不二工机 | Electric valve and method for assembling the same |
| CN205715985U (en) * | 2016-05-06 | 2016-11-23 | 浙江盾安禾田金属有限公司 | A kind of electric expansion valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008232290A (en) * | 2007-03-20 | 2008-10-02 | Saginomiya Seisakusho Inc | Needle valve, and refrigerating cycle device having the same |
| US8157183B2 (en) * | 2008-05-29 | 2012-04-17 | Kabushiki Kaisha Saginomiya Seisakusho | Expansion valve, heat pump type refrigeration cycle apparatus, and air handling unit |
| US8157184B2 (en) * | 2008-05-29 | 2012-04-17 | Kabushiki Kaisha Saginomiya Seisakusho | Expansion valve, heat pump type refrigeration cycle apparatus, and air handling unit |
| JP2010053906A (en) * | 2008-08-26 | 2010-03-11 | Panasonic Corp | Fluid bearing device, spindle motor with the same, and information processor |
| JP5627612B2 (en) * | 2012-02-10 | 2014-11-19 | 株式会社鷺宮製作所 | Expansion valve |
| US9726406B2 (en) * | 2012-02-10 | 2017-08-08 | Kabushiki Kaisha Saginomiya Seisakusho | Expansion valve |
| JP5943427B2 (en) * | 2013-03-15 | 2016-07-05 | 株式会社鷺宮製作所 | Manufacturing method of valve device |
-
2017
- 2017-01-31 JP JP2017016004A patent/JP6726116B2/en active Active
-
2018
- 2018-01-09 CN CN202011612736.6A patent/CN112781282A/en active Pending
- 2018-01-09 CN CN201810019632.0A patent/CN108375250B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011204317A (en) * | 2010-03-25 | 2011-10-13 | Seiko Instruments Inc | Rolling bearing device and pivot device |
| CN104676071A (en) * | 2013-11-07 | 2015-06-03 | 株式会社鹭宫制作所 | Electric valve |
| CN105909804A (en) * | 2015-02-24 | 2016-08-31 | 株式会社不二工机 | Electric valve and method for assembling the same |
| CN205715985U (en) * | 2016-05-06 | 2016-11-23 | 浙江盾安禾田金属有限公司 | A kind of electric expansion valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6726116B2 (en) | 2020-07-22 |
| CN108375250A (en) | 2018-08-07 |
| JP2018123879A (en) | 2018-08-09 |
| CN112781282A (en) | 2021-05-11 |
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