Motor-operated valve

Abstract

To provide a motor valve capable of suppressing the entry of foreign matters into the inside space of a can, and also suppressing the occurrence of malfunction or abnormal sound resulting from a differential pressure between refrigerant pressure in a valve chest and a refrigerant pressure in the inside space of the can.SOLUTION: A motor valve 1 has a refrigerant passage K for connecting a valve chest 13 to an inside space 30e of a can 30. The refrigerant passage K has an inside space 20e of a holder 20, a first annular groove 28 formed between the holder 20 and a valve element support member 25 and connected to the valve chest 13 and the inside space 20e of the holder 20, and a gap 24 formed between the holder 20 and the valve element support member 25. The first annular groove 28 is connected via the gap 24 to the inside space 20e of the holder 20.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a motor-operated valve. [Background technology]

[0002] Patent Document 1 discloses a conventional motor-operated valve. The motor-operated valve of Patent Document 1 has a valve body, a valve element, a can, a rotor, a speed reduction mechanism, and a screw mechanism. The valve body has a valve chamber and a valve seat. The valve element faces the valve seat in the valve chamber. A rotor is disposed inside the can. The rotation of the rotor is slowed down by the speed reduction mechanism, converted into linear motion by the screw mechanism, and transmitted to the valve element. The motor-operated valve has a refrigerant passage that connects the valve chamber and the inner space of the can. A foreign matter intrusion prevention member is disposed in the refrigerant passage. The foreign matter intrusion prevention member is a filter such as a porous body or a wire mesh. The foreign matter intrusion prevention member captures foreign matter contained in the refrigerant and prevents the foreign matter from intruding from the valve chamber into the inner space of the can. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-275120 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned motor-operated valve, the foreign object prevention member prevents the refrigerant from flowing smoothly through the refrigerant passage, and it takes a relatively long time for the change in refrigerant pressure in the valve chamber to be transmitted to the refrigerant in the inner space of the can. Therefore, when the refrigerant pressure in the valve chamber changes suddenly, the pressure difference between the refrigerant pressure in the valve chamber and the refrigerant pressure in the inner space of the can becomes large. This can cause malfunctions or abnormal noise in the reduction mechanism or screw mechanism when the valve body is operated.

[0005] Therefore, an object of the present invention is to provide an electric valve that can prevent foreign matter from entering the inner space of the can and can prevent malfunctions and abnormal noise caused by the pressure difference between the refrigerant pressure in the valve chamber and the refrigerant pressure in the inner space of the can. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, one embodiment of the electric valve of the present invention is an electric valve having a valve body having a valve chamber and a valve port, a valve body arranged facing the valve port, a cylindrical holder attached to the valve body, a valve body support member having a surface contacting the holder and a surface facing the valve chamber, a cylindrical can joined to the holder, and a drive mechanism arranged inside the can for driving the valve body, wherein the electric valve has a refrigerant passage connecting the valve chamber and an inner space of the can, and the refrigerant passage has: the inner space of the holder, a first annular passage formed between the holder and the valve body support member, a first vertical passage formed in the valve body support member connecting the valve chamber and the first annular passage, and a gap formed between the holder and the valve body support member connecting the inner peripheral edge of the first annular passage and the inner space of the holder.

[0007] According to the present invention, the motor-operated valve has a refrigerant passage connecting the valve chamber and the inner space of the can. The refrigerant passage has the inner space of the holder, a first annular passage formed between the holder and the valve body support member, a first vertical passage formed in the valve body support member and connecting the valve chamber and the first annular passage, and a gap formed between the holder and the valve body support member and connecting the inner peripheral edge of the first annular passage and the inner space of the holder. As a result, the refrigerant flows from the valve chamber into the first annular passage through the first vertical passage and flows in the circumferential direction in the first annular passage. In the first annular passage, foreign matter contained in the refrigerant moves to the outer peripheral edge side by centrifugal force. The refrigerant flows from the inner edge of the first annular passage to the inner space of the holder through the gap between the holder and the valve body support member. At this time, foreign matter contained in the refrigerant remains on the outer peripheral edge side of the first annular passage, and the refrigerant with less foreign matter on the inner peripheral edge side of the first annular passage flows into the inner space of the holder through the gap. Therefore, the motor-operated valve can prevent foreign matter from entering the internal space of the can without providing a filter or the like in the refrigerant passage, and can quickly transmit changes in the refrigerant pressure in the valve chamber to the refrigerant in the internal space of the can. As a result, the motor-operated valve can prevent malfunctions and abnormal noise caused by the pressure difference between the refrigerant pressure in the valve chamber and the refrigerant pressure in the internal space of the can.

[0008] In the present invention, it is preferable that the drive mechanism includes a cylindrical guide member disposed inside the holder and having a female thread formed on its inner circumferential surface, and a drive shaft having a male thread formed on its outer circumferential surface to be screwed with the female thread, and the refrigerant passage further includes a second annular passage formed between the holder and the guide member, a second vertical passage formed in the guide member and connecting the inner space of the holder and the second annular passage, and a horizontal passage formed in the holder and connecting the second annular passage and the inner space of the can. In this way, the refrigerant passage has a complex passage shape including two passage parts ([1] first annular passage and first vertical passage, [2] second annular passage and second vertical passage) combining an annular passage and a vertical passage. Furthermore, foreign matter contained in the refrigerant has a higher specific gravity than the refrigerant and is less likely to change its flow direction than the refrigerant. Therefore, the foreign matter can be retained at the point where the flow direction of the refrigerant changes in the refrigerant passage, and the intrusion of the foreign matter into the inner space of the can can be further suppressed.

[0009] In the present invention, it is preferable that the gap is smaller than the amount of play of the drive mechanism. In this way, the gap can restrict the passage of foreign matter that may affect the operation of the drive mechanism, thereby suppressing malfunction of the motor-operated valve due to foreign matter. Effect of the Invention

[0010] According to the present invention, it is possible to prevent foreign matter from entering the internal space of the can, and to prevent malfunctions and abnormal noise caused by the pressure difference between the refrigerant pressure in the valve chamber and the refrigerant pressure in the internal space of the can. [Brief description of the drawings]

[0011] [Figure 1] 1 is a vertical sectional view of a motor-operated valve according to an embodiment of the present invention. [Diagram 2] 2 is an enlarged cross-sectional view of a portion of the motor-operated valve of FIG. 1. [Diagram 3] 2 is a plan view of a valve body support member of the motor-operated valve of FIG. 1. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a motor-operated valve according to an embodiment of the present invention will be described with reference to Figures 1 to 4. The motor-operated valve 1 of this embodiment is used, for example, to adjust the flow rate of a refrigerant in a refrigeration cycle or the like.

[0013] Fig. 1 is a longitudinal sectional view of a motor-operated valve according to an embodiment of the present invention. Fig. 2 is an enlarged sectional view of a portion of the motor-operated valve of Fig. 1. Fig. 3 is a plan view of a valve body support member of the motor-operated valve of Fig. 1. Fig. 4 is a sectional view taken along line IV-IV of Fig. 2.

[0014] As shown in FIG. 1, the motor-operated valve 1 according to this embodiment includes a valve body 10, a holder 20, a valve body support member 25, a can 30, a drive mechanism 40, a valve body 70, and a stator unit 80.

[0015] The valve body 10 has a rectangular parallelepiped shape. The valve body 10 has a valve chamber 13 and a valve port 14 connected to the valve chamber 13. The valve body 10 has a first passage 17 and a second passage 18. One end of the first passage 17 is connected to the valve chamber 13, and the other end of the first passage 17 opens to the left side surface 10a of the valve body 10. One end of the second passage 18 is connected to the valve chamber 13 via the valve port 14, and the other end of the second passage 18 opens to the right side surface 10b of the valve body 10. The valve body 10 has a mounting hole 19. The mounting hole 19 opens to the upper surface 10c of the valve body 10. A female thread is formed on the inner peripheral surface of the mounting hole 19. The valve chamber 13 opens to the bottom surface 19a of the mounting hole 19.

[0016] The holder 20 has a cylindrical shape. A male thread is formed on the outer peripheral surface of a lower portion 21 of the holder 20. The male thread of the holder 20 is screwed into the female thread of the mounting hole 19 of the valve body 10. The holder 20 is attached to the valve body 10 by a screw structure. A horizontal hole 23 that penetrates in the radial direction is formed in an upper portion 22 of the holder 20.

[0017] The valve body support member 25 integrally has a large diameter portion 26 and a small diameter portion 27 .

[0018] The large diameter portion 26 has a cylindrical shape. An upper end surface 26a of the large diameter portion 26 is in contact with a lower end surface 20b of the holder 20. A first annular groove 28 is formed in the upper end surface 26a of the large diameter portion 26. The first annular groove 28 is arranged coaxially with the large diameter portion 26. The first annular groove 28 is a first annular passage formed between the holder 20 and the large diameter portion 26. A lower end surface 26b of the large diameter portion 26 faces the valve chamber 13. The large diameter portion 26 has a first vertical hole 29 extending upward from the lower end surface 26b. The first vertical hole 29 is arranged parallel to the axial direction of the large diameter portion 26. An upper end portion of the first vertical hole 29 is connected to the first annular groove 28. A lower end portion of the first vertical hole 29 is connected to the valve chamber 13. The first vertical hole 29 is a first vertical passage formed in the large diameter portion 26 and connecting the valve chamber 13 and the first annular groove 28. A downward-facing annular flat surface 26f is formed on the outer circumferential surface of the large diameter portion 26. The large diameter portion 26 is press-fitted into the valve chamber 13 from the mounting hole 19 side. The annular flat surface 26f abuts against the bottom surface 19a of the mounting hole 19. The large diameter portion 26 is disposed inside the mounting hole 19, between the valve body 10 and the holder 20.

[0019] The small diameter portion 27 has a cylindrical shape. The small diameter portion 27 is coaxially connected to the upper end surface 26a of the large diameter portion 26. The diameter of the outer peripheral surface 27c of the small diameter portion 27 is the same as the diameter of the inner side surface 28d of the first annular groove 28. The diameter of the inner peripheral surface of the small diameter portion 27 is the same as the diameter of the inner peripheral surface of the large diameter portion 26. The inner peripheral surface of the large diameter portion 26 and the inner peripheral surface of the small diameter portion 27 form a valve body support hole 25e. The valve body 70 is disposed inside the valve body support hole 25e. The valve body support member 25 supports the valve body 70 so that it can move in the vertical direction. The small diameter portion 27 is disposed inside the holder 20. The diameter of the outer peripheral surface 27c of the small diameter portion 27 is slightly smaller than the diameter of the inner peripheral surface 20d of the holder 20. The outer peripheral surface 27c of the small diameter portion 27 and the inner peripheral surface 20d of the holder 20 form a circular ring-shaped gap 24. Gap 24 connects the inner peripheral edge of first annular groove 28 and inner space 20e of holder 20. Note that, as long as gap 24 connects the inner peripheral edge of first annular groove 28 and inner space 20e of holder 20, the diameter of outer peripheral surface 27c of small diameter portion 27 does not have to be the same as the diameter of inner side surface 28d of first annular groove 28.

[0020] The can 30 has a cylindrical shape with a closed upper end and an open lower end. The lower end of the can 30 is joined to the outer periphery of a joining member 35 in the shape of an annular plate. The upper part of the holder 20 is disposed inside the joining member 35. The inner periphery of the joining member 35 is joined to the holder 20. The can 30 is indirectly joined to the holder 20 via the joining member 35. The can 30 may also be directly joined to the holder 20.

[0021] The drive mechanism 40 moves the valve body 70 in the vertical direction. The drive mechanism 40 has a magnet rotor 41, a planetary gear mechanism 50, a guide member 60, a drive shaft 65, and a ball 68.

[0022] The magnet rotor 41 has a cylindrical shape. N poles and S poles are alternately arranged in the circumferential direction on the outer circumferential surface of the magnet rotor 41. The outer diameter of the magnet rotor 41 is smaller than the inner diameter of the can 30. The magnet rotor 41 is rotatably arranged inside the can 30. A disk-shaped connecting member 42 is joined to the upper end of the magnet rotor 41. The connecting member 42 closes the upper end of the magnet rotor 41. A rotor shaft 43 passes through the center of the connecting member 42. The magnet rotor 41 is connected to the rotor shaft 43 via the connecting member 42.

[0023] The planetary gear mechanism 50 is disposed inside the magnet rotor 41. The planetary gear mechanism 50 includes a gear case 51, a fixed ring gear 52, a sun gear 53, a plurality of planetary gears 54, a carrier 55, an output gear 56, and an output shaft 57. The gear case 51 has a cylindrical shape. The gear case 51 is coaxially joined to the upper end of the holder 20. The fixed ring gear 52 is an internal gear. The fixed ring gear 52 is fixed to the upper end of the gear case 51. The sun gear 53 is disposed coaxially with the connecting member 42. The sun gear 53 is integrated with the connecting member 42. The rotor shaft 43 passes through the sun gear 53. The sun gear 53 is rotated together with the magnet rotor 41 and the connecting member 42. The plurality of planetary gears 54 are disposed between the fixed ring gear 52 and the sun gear 53. The carrier 55 has a disk shape. The rotor shaft 43 passes through the center of the carrier 55. The carrier 55 can rotate around the rotor shaft 43. The carrier 55 has a plurality of support shafts 55a. The plurality of support shafts 55a rotatably support a plurality of planetary gears 54. The output gear 56 has a cylindrical shape with a bottom. The output gear 56 is an internal gear. A plurality of planetary gears 54 are arranged between the output gear 56 and the sun gear 53. The output shaft 57 has a cylindrical shape. The upper part of the output shaft 57 is fixed to a hole formed in the bottom part of the output gear 56. A slit 57a extending in the vertical direction is formed in the lower part of the output shaft 57. The rotation of the sun gear 53 is decelerated by the fixed ring gear 52, the plurality of planetary gears 54, the carrier 55, and the output gear 56, and is transmitted to the output shaft 57.

[0024] The guide member 60 has a cylindrical shape. The guide member 60 is fitted inside the upper portion 22 of the holder 20. A female thread 60f is formed on the lower portion of the inner peripheral surface of the guide member 60. The output shaft 57 is disposed inside the guide member 60. The guide member 60 rotatably supports the output shaft 57. A second annular groove 61 is formed on the outer peripheral surface of the guide member 60. The second annular groove 61 is disposed coaxially with the guide member 60. The second annular groove 61 is connected to the horizontal hole 23 of the holder 20. The second annular groove 61 is a second annular passage formed between the holder 20 and the guide member 60. The horizontal hole 23 is a horizontal passage formed in the holder 20 and connecting the second annular groove 61 and the inner space 30e of the can 30. The lower end surface 60b of the guide member 60 faces the inner space 20e of the holder 20. The guide member 60 has a second vertical hole 62 extending upward from the lower end surface 60b. The second vertical hole 62 is arranged parallel to the axial direction of the guide member 60. The upper end of the second vertical hole 62 is connected to the second annular groove 61. The lower end of the second vertical hole 62 is connected to the inner space 20e of the holder 20. The second vertical hole 62 is arranged at a position shifted by 180 degrees around the axis of the holder 20 with respect to the horizontal hole 23. The second vertical hole 62 is a second vertical passage formed in the guide member 60 and connecting the inner space 20e of the holder 20 and the second annular groove 61.

[0025] The drive shaft 65 has a cylindrical portion 66 and a flat plate portion 67. The flat plate portion 67 is connected to the upper end of the cylindrical portion 66. The cylindrical portion 66 and the flat plate portion 67 are integrally formed. A male screw 66f is formed on the outer circumferential surface of the cylindrical portion 66. The male screw 66f of the cylindrical portion 66 is screwed into the female screw 60f of the guide member 60. The flat plate portion 67 is arranged in the slit 57a of the output shaft 57 so as to be movable in the vertical direction. The drive shaft 65 is rotated by the output shaft 57 and moves in the vertical direction by the screw feed action. The ball 68 is arranged between the drive shaft 65 and the ball receiving portion 74 of the valve body 70.

[0026] The size of the gap 24 is smaller than the size of the play of the planetary gear mechanism 50 and the size of the play between the female thread 60 f of the guide member 60 and the male thread 66 f of the drive shaft 65 .

[0027] The valve body 70 has a stem 71, a valve portion 72, a spring receiving portion 73, and a ball receiving portion 74. The stem 71 has a cylindrical shape. The stem 71 is disposed in the valve body support hole 25e of the valve body support member 25. The stem 71 is supported by the valve body support member 25 so as to be movable in the vertical direction. The valve portion 72 is connected to the lower end of the stem 71. The valve portion 72 has an annular shape. The valve portion 72 protrudes radially outward from the outer circumferential surface of the stem 71. The valve portion 72 is disposed facing the valve port 14 in the vertical direction. The spring receiving portion 73 has a cylindrical shape. The spring receiving portion 73 is joined to the upper end of the stem 71. The spring receiving portion 73 has a flange portion 73a protruding radially outward. The ball receiving portion 74 has a circular flat plate portion and a convex portion connected to the lower surface of the flat plate portion. The ball receiving portion 74 has a flat portion in contact with the ball 68, and a protruding portion fitted into a hole formed in the spring receiving portion 73. A valve-opening spring 75 is disposed between the flange portion 73a of the spring receiving portion 73 and the small diameter portion 27 of the valve body support member 25. The valve-opening spring 75 is a compression coil spring. The valve-opening spring 75 presses the valve body 70 (flange portion 73a) upward. The valve body 70 changes the opening area of ​​the valve orifice 14 steplessly by the valve portion 72 moving forward and backward relative to the valve orifice 14. The valve body 70 may close the valve orifice 14 (i.e., the opening area may be zero).

[0028] The stator unit 80 has a stator 90 and a cover 95. The stator 90 has a cylindrical shape. The can 30 is disposed inside the stator 90. The cover 95 houses the stator 90. The stator unit 80 and the magnet rotor 41 constitute a stepping motor.

[0029] The motor-operated valve 1 has a refrigerant passage K that connects the valve chamber 13 and the inner space 30e of the can 30. The refrigerant passage K has, connected in this order from the valve chamber 13 side, a first vertical hole 29, a first annular groove 28, a gap 24, the inner space 20e of the holder 20, a second vertical hole 62, a second annular groove 61, and a horizontal hole 23.

[0030] In the motor-operated valve 1, the valve port 14, holder 20, valve body support member 25, can 30, magnet rotor 41, connecting member 42, rotor shaft 43, output shaft 57, guide member 60, drive shaft 65, valve body 70, and stator 90 all have the same central axis.

[0031] Next, the operation of the motor-operated valve 1 will be described.

[0032] In the motor-operated valve 1, a current is passed through the coil of the stator 90 to rotate the magnet rotor 41 in one direction. The rotation of the magnet rotor 41 is transmitted to the drive shaft 65 via the planetary gear mechanism 50. The drive shaft 65 moves downward due to the screw feed action between the drive shaft 65 and the guide member 60. The drive shaft 65 pushes the valve body 70 downward, and the opening area of ​​the valve port 14 becomes smaller.

[0033] In the motor-operated valve 1, a current is passed through the coil of the stator 90 to rotate the magnet rotor 41 in the other direction. The rotation of the magnet rotor 41 is transmitted to the drive shaft 65 via the planetary gear mechanism 50. The drive shaft 65 moves upward due to the screw feed action between the drive shaft 65 and the guide member 60. The valve disc 70 is pushed upward by the valve-opening spring 75, and the opening area of ​​the valve port 14 increases.

[0034] The motor-operated valve 1 comprises a valve body 10 having a valve chamber 13 and a valve port 14, a valve element 70 arranged opposite the valve port 14, a cylindrical holder 20 attached to the valve body 10, a valve element support member 25 having an upper end surface 26a in contact with the holder 20 and a lower end surface 26b facing the valve chamber 13, a cylindrical can 30 joined to the holder 20, and a drive mechanism 40 arranged inside the can 30 and driving the valve element 70. The motor-operated valve 1 has a refrigerant passage K connecting the valve chamber 13 and the inner space 30e of the can 30. The refrigerant passage K has an inner space 20e of the holder 20, a first annular groove 28 formed between the holder 20 and the valve body support member 25, a first vertical hole 29 formed in the valve body support member 25 and connecting the valve chamber 13 and the first annular groove 28, and a gap 24 formed between the holder 20 and the valve body support member 25 and connecting the inner edge of the first annular groove 28 and the inner space 20e of the holder 20.

[0035] As a result of this, the refrigerant introduced into the valve chamber 13 flows from the valve chamber 13 through the first vertical hole 29 into the first annular groove 28 and flows in the circumferential direction in the first annular groove 28. In the first annular groove 28, foreign matter contained in the refrigerant moves to the outer periphery side by centrifugal force. The refrigerant flows from the inner edge of the first annular groove 28 through the gap 24 into the inner space 20e of the holder 20. At this time, foreign matter contained in the refrigerant remains on the outer periphery side of the first annular groove 28, and the refrigerant with less foreign matter on the inner periphery side of the first annular groove 28 flows into the inner space 20e of the holder 20 through the gap 24. Therefore, in the motor-operated valve 1, it is possible to suppress the intrusion of foreign matter into the inner space 30e of the can 30 without providing a filter or the like in the refrigerant passage K, and it is possible to quickly transmit the change in the refrigerant pressure in the valve chamber 13 to the refrigerant in the inner space 30e of the can 30. Therefore, the motor-operated valve 1 can suppress malfunctions and abnormal noises caused by the pressure difference between the refrigerant pressure in the valve chamber 13 and the refrigerant pressure in the inner space 30e of the can 30.

[0036] The drive mechanism 40 is disposed inside the holder 20 and includes a cylindrical guide member 60 having an internal thread 60f formed on its inner circumferential surface, and a drive shaft 65 having an external thread 66f formed on its outer circumferential surface to be screwed with the internal thread 60f. The refrigerant passage K further includes a second annular groove 61 formed between the holder 20 and the guide member 60, a second vertical hole 62 formed in the guide member 60 and connecting the inner space 20e of the holder 20 and the second annular groove 61, and a horizontal hole 23 formed in the holder 20 and connecting the second annular groove 61 and the inner space 30e of the can 30. In this way, the refrigerant passage K has a complex passage shape including two passage parts ([1] the first annular groove 28 and the first vertical hole 29, and [2] the second annular groove 61 and the second vertical hole 62) that combine an annular passage and a vertical passage. The foreign matter contained in the refrigerant has a higher specific gravity than the refrigerant, and is less likely to change its flow direction than the refrigerant. Therefore, in the refrigerant passage K, foreign matter can be retained at a point where the direction of the refrigerant flow changes, and the intrusion of foreign matter into the inner space 30e of the can 30 can be further suppressed.

[0037] In addition, the gap 24 is smaller than the amount of play in the drive mechanism 40 (the planetary gear mechanism 50 and the screw mechanism between the guide member 60 and the drive shaft 65). This makes it possible to restrict the passage of foreign matter that may affect the operation of the drive mechanism 40 through the gap 24, thereby suppressing malfunction of the motor-operated valve 1 caused by foreign matter.

[0038] In the above-described motor-operated valve 1, the rotation of the magnet rotor 41 is reduced in speed by the planetary gear mechanism 50 and transmitted to the drive shaft 65. The motor-operated valve 1 may have a direct-acting configuration in which the rotation of the magnet rotor 41 is directly transmitted to the drive shaft 65.

[0039] Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations of the embodiments. Any addition, deletion, or design change of components by a person skilled in the art to the above-mentioned embodiments, or any combination of features of the embodiments as appropriate, is also included in the scope of the present invention as long as it does not go against the spirit of the present invention. [Explanation of symbols]

[0040] 1...motor-operated valve, 10...valve body, 10a...left side surface, 10b...right side surface, 10c...upper surface, 13...valve chamber, 14...valve port, 17...first passage, 18...second passage, 19...mounting hole, 19a...bottom surface, 20...holder, 20b...lower end surface, 20d...inner peripheral surface, 20e...inner space, 21...lower portion, 22...upper portion, 23...horizontal hole, 24...gap, 25...valve body support member, 25e...valve body support hole, 26...large diameter portion, 26a...upper end surface, 26b...lower end surface, 26f...annular flat surface, 27...small diameter portion, 27c...outer peripheral surface, 28...first annular groove, 28d...inner side surface, 29...first vertical hole, 30...can, 30e...inner space, 35...joint member, 40...drive mechanism, 41...magnet rotor , 42...connecting member, 43...rotor shaft, 50...planetary gear mechanism, 51...gear case, 52...fixed ring gear, 53...sun gear, 54...planetary gear, 55...carrier, 55a...support shaft, 56...output gear, 57...output shaft, 57a...slit, 60...guide member, 60b...lower end surface, 60f...female thread, 61...second annular groove, 62...second vertical hole, 65...drive shaft, 66...cylindrical portion, 66f...male thread, 67...flat plate portion, 68...ball, 70...valve body, 71...stem, 72...valve portion, 73...spring receiving portion, 73a...flange portion, 74...ball receiving portion, 75...valve opening spring, 80...stator unit, 90...stator, 95...cover, K...refrigerant passage

Claims

1. An electrically operated valve comprising: a valve body having a valve chamber and a valve port; a valve element disposed opposite the valve port; a cylindrical holder attached to the valve body; a valve element support portion disposed between the holder and the valve chamber; a cylindrical can directly or indirectly joined to the holder; and a drive mechanism for driving the valve element, the motor-operated valve has a refrigerant passage connecting the valve chamber and an inner space of the can, The drive mechanism includes: A cylindrical guide portion having an internal thread and disposed inside the holder; a drive shaft having a male thread that is screwed into the female thread, The refrigerant passage is An inner space of the holder; a first annular passage formed between the holder and the valve body support portion and connected to the valve chamber and an inner space of the holder; a gap formed between the holder and the valve body support portion, An electrically operated valve, characterized in that the first annular passage is connected to an inner space of the holder via the gap.

2. The motor-operated valve according to claim 1 , wherein the clearance is less than a magnitude of play in the drive mechanism.

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