Motor valve and valve gear

Abstract

To provide a motor valve and a valve gear which can be arranged in a small space.SOLUTION: A motor valve 1 includes a valve body assembly 5, and a stator unit 8 fixed to the valve body assembly 5, the valve body assembly 5 having a valve body 10 having a valve chest 12 and a valve port 13, a cylindrical rotor case 30 mounted to the valve body 10, a cylindrical rotor 40 arranged inside the rotor case 30, and a valve element 20 to be moved with the rotation of the rotor 40, the stator unit 8 having a stator 90 arranged inside the rotor 40 to construct a stepping motor 98 together with the rotor 40, and a synthetic resin housing 80 having a cylindrical connector part 87.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a motorized valve and a valve device. [Background technology]

[0002] Patent Document 1 discloses an example of a conventional motor-operated valve. The motor-operated valve has a valve body, a case, a rotor, a stator, and a housing. The case has a cylindrical shape and is joined to the valve body. The rotor is disposed inside the case. The stator has a cylindrical shape and is disposed coaxially outside the case. The rotor and the stator constitute a motor. The housing accommodates the case. The housing has a connector portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-83453 A Summary of the Invention [Problem to be solved by the invention]

[0004] The motor-operated valve of Patent Document 1 is used in, for example, the valve device shown in FIG. 20. The valve device 803 has a plurality of motor-operated valves 801 and a flow path block 950. The flow path block 950 has a rectangular parallelepiped shape and has a mounting surface 951 on which the plurality of motor-operated valves 801 are arranged. Since the stator of the motor-operated valve 801 is arranged on the outside of the case, the outer diameter of the motor-operated valve 801 is large, and a large space is required to arrange the motor-operated valve 801. Therefore, a relatively large mounting surface 951 is required in the flow path block 950. In addition, the connector portion 887 of the motor-operated valve 801 faces forward and backward. Therefore, in a system in which the valve device 803 is incorporated, a space is required around the plurality of motor-operated valves 801 to arrange cables connected to the connector portion 887.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, an object of the present invention is to provide an electrically operated valve and a valve device that can be arranged in a small space. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, an electric valve according to one embodiment of the present invention is characterized in having a cylindrical rotor case, a cylindrical magnet rotor arranged inside the rotor case, a valve body that moves in response to rotation of the magnet rotor, and a stator that is arranged inside the magnet rotor and forms a motor together with the magnet rotor.

[0007] In the present invention, it is preferable that the motor-operated valve further has an inner case integrally having a cylindrical peripheral wall portion, a disk-shaped bottom wall portion connected to a first end of the peripheral wall portion, and an annular portion whose inner peripheral edge is connected to a second end of the peripheral wall portion, the outer peripheral edge of the annular portion is joined to one end of the rotor case, the peripheral wall portion and the bottom wall portion are arranged inside the magnet rotor, and the stator is arranged inside the peripheral wall portion.

[0008] In the present invention, it is preferable that the motor-operated valve further has a housing made of synthetic resin, the housing has a cylindrical support portion in which the stator is embedded, and the support portion is fitted into the inner case.

[0009] In the present invention, it is preferable that the housing further includes a cylindrical connector portion, the connector portion extending in the axial direction of the magnet rotor.

[0010] In the present invention, it is preferable that the stator has a laminated core arranged coaxially with the magnet rotor and having a plurality of pole portions extending radially, and a plurality of coils arranged on the pole portions.

[0011] In the present invention, it is preferable that the motor-operated valve further includes a magnetic sensor that detects the magnetism of the magnet rotor, and the magnetic sensor is disposed at a location between the pole portions on the support portion.

[0012] In the present invention, it is preferable that the electric valve further has a drive shaft that rotates together with the magnet rotor, and that the valve element has a female thread and the drive shaft has a male thread that is screwed into the female thread, or that the drive shaft has a female thread and the valve element has a male thread that is screwed into the female thread, and that the female thread and the male thread form a feed screw mechanism that moves the valve element.

[0013] In order to achieve the above-mentioned object, a valve device according to another embodiment of the present invention is a valve device having at least one electric valve and a flow path block having a mounting surface on which the electric valve is arranged, characterized in that the electric valve has a cylindrical rotor case, a cylindrical magnet rotor arranged inside the rotor case, a valve body that moves in response to rotation of the magnet rotor, and a stator arranged inside the magnet rotor and constituting a motor together with the magnet rotor. Effect of the Invention

[0014] According to the present invention, the magnet rotor has a cylindrical shape, and the stator that constitutes the motor together with the magnet rotor is disposed inside the magnet rotor. As a result, the outer diameter of the motor-operated valve is smaller than in a configuration in which the stator is disposed outside the magnet rotor. Therefore, the motor-operated valve can be disposed in a relatively small space. [Brief description of the drawings]

[0015] [Figure 1] 1 is a front view of a motor-operated valve according to a first embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4]FIG. 2 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 2 is a cross-sectional view of a valve body assembly of the motor-operated valve. [Figure 7] FIG. 2 is a front view of a stator unit of the motor-operated valve. [Figure 8] FIG. 4 is a rear view of the stator unit. [Figure 9] FIG. 4 is a bottom view of the stator unit. [Figure 10] FIG. 8 is a cross-sectional view taken along line XX in FIG. [Figure 11] 11 is a cross-sectional view taken along line XI-XI in FIG. [Figure 12] FIG. 4 is a rear view of the stator of the stator unit. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] 13 is a cross-sectional view taken along line XV-XV in FIG. 12. [Figure 16] FIG. 16 is a cross-sectional view taken along line XVI-XVI in FIG. [Figure 17] FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. [Figure 18] FIG. 5 is a cross-sectional view of a valve device according to a second embodiment of the present invention. [Figure 19] FIG. 11 is a plan view of a valve device according to a third embodiment of the present invention. [Figure 20] FIG. 1 is a plan view of a conventional valve device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] A motor-operated valve according to a first embodiment of the present invention will now be described with reference to Figures 1 to 17. The motor-operated valve according to this embodiment is used, for example, to control the flow rate of refrigerant in an automobile air conditioner.

[0017] 1, 2, and 3 are a front view, a plan view, and a bottom view of the motor-operated valve according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. FIG. 6 is a cross-sectional view of a valve body assembly of the motor-operated valve. FIG. 7, 8, and 9 are a front view, a rear view, and a bottom view of a stator unit of the motor-operated valve. FIG. 10 is a cross-sectional view taken along line XX in FIG. 7. FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 10. FIG. 12, 13, and 14 are a rear view, a plan view, and a bottom view of a stator of the stator unit. FIG. 15 is a cross-sectional view taken along line XV-XV in FIG. 12. FIG. 16 is a cross-sectional view taken along line XVI-XVI in FIG. 15. FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. 15. In each drawing, the X direction indicated by the arrow X is the left-right direction, the Y direction indicated by the arrow Y is the front-back direction, and the Z direction indicated by the arrow Z is the up-down direction (the direction of the axis L). The direction of the arrow X with the letter "X" is the right direction, the direction of the arrow Y with the letter "Y" is the front direction, and the direction of the arrow Z with the letter "Z" is the upward direction.

[0018] As shown in FIGS. 1 to 5, the motor-operated valve 1 according to the first embodiment has a valve body assembly 5 and a stator unit 8.

[0019] As shown in FIG. 6, the valve body assembly 5 includes a valve body 10, a valve element 20, a rotor case 30, a bearing 35, a rotor 40, a drive shaft 50, and an inner case 60.

[0020] The valve body 10 includes a body member 11 , a sleeve 18 , and a valve body support plate 19 .

[0021] The main body member 11 is made of a metal such as an aluminum alloy. The outer shape of a cross section of an upper portion 11a of the main body member 11 is hexagonal. The "cross section" is a cross section perpendicular to the axis L. The main body member 11 has a valve chamber 12, a valve port 13, a valve seat 14, a first connecting passage 15, a second connecting passage 16, and a mounting hole 17.

[0022] The valve orifice 13 is connected to the valve chamber 12. The valve orifice 13 is surrounded by a valve seat 14 in the valve chamber 12. The first connecting passage 15 has a cross shape extending in the left-right direction and the front-rear direction from the valve chamber 12. The second connecting passage 16 extends downward from the valve orifice 13.

[0023] The mounting hole 17 is disposed on the upper surface 11c of the main body member 11. The mounting hole 17 is connected to the valve chamber 12. The main body member 11 has a holding surface 17a which is an annular flat surface facing upward. The holding surface 17a is disposed at a connection point between the mounting hole 17 and the valve chamber 12. The main body member 11 has a male thread 11s and a female thread 11t. The male thread 11s is disposed on the outer peripheral surface of the lower portion 11b of the main body member 11. The female thread 11t is disposed on the inner peripheral surface of the mounting hole 17. The main body member 11 also has annular grooves 11d and 11e. The annular groove 11d is disposed at a position above the male thread 11s on the outer peripheral surface of the lower portion 11b of the main body member 11. The annular groove 11e is disposed at a position below the first connection passage 15 on the outer peripheral surface of the lower portion 11b of the main body member 11. O-rings are disposed in the annular grooves 11d and 11e.

[0024] The sleeve 18 is made of synthetic resin or metal. The sleeve 18 has a cylindrical shape as a whole. The sleeve 18 integrally includes a small diameter portion 18a, a large diameter portion 18b, and a flange portion 18c.

[0025] The small diameter portion 18a and the large diameter portion 18b have a cylindrical shape. The inner diameter of the large diameter portion 18b is larger than the outer diameter of the small diameter portion 18a. The lower end of the large diameter portion 18b is coaxially connected to the upper end of the small diameter portion 18a. The flange portion 18c has an annular plate shape. The inner peripheral edge of the flange portion 18c is connected to the upper end of the large diameter portion 18b. The small diameter portion 18a and the large diameter portion 18b are disposed in the valve chamber 12. The flange portion 18c is in contact with the retaining surface 17a of the main body member 11.

[0026] The valve element support plate 19 is made of synthetic resin or metal. The valve element support plate 19 has an annular plate shape. The outer peripheral edge of the valve element support plate 19 is circular and the inner peripheral edge is square. The valve element support plate 19 is placed in the mounting hole 17, and the lower surface of the valve element support plate 19 contacts the flange portion 18c of the sleeve 18.

[0027] The valve body 20 is made of synthetic resin or metal and integrally includes a shaft portion 21 and a valve portion 22.

[0028] The shaft portion 21 has a columnar shape overall. The upper portion 21a of the shaft portion 21 has a rectangular columnar shape. The outer shape of the cross section of the upper portion 21a is the same square as the inner peripheral edge of the valve body support plate 19. The lower portion 21b of the shaft portion 21 has a cylindrical shape. The outer diameter of the lower portion 21b is the same as the inner diameter of the small diameter portion 18a of the sleeve 18. The shaft portion 21 has a screw hole 21c and a female screw 21t. The screw hole 21c is disposed on the upper end surface of the shaft portion 21. The female screw 21t is disposed on the inner peripheral surface of the screw hole 21c.

[0029] An upper portion 21a of the shaft portion 21 is disposed inside the valve body support plate 19. A lower portion 21b of the shaft portion 21 is disposed inside the small diameter portion 18a of the sleeve 18. The valve body 20 is supported by the sleeve 18 and the valve body support plate 19 so as to be movable in the vertical direction (direction of axis L). Rotation of the valve body 20 about the axis L is restricted by the valve body support plate 19. The shape of the upper portion 21a of the shaft portion 21 and the shape of the inner peripheral edge of the valve body support plate 19 may be any shape that restricts rotation of the valve body 20 about the axis L.

[0030] The valve portion 22 has a truncated cone shape with a diameter that decreases from top to bottom. The valve portion 22 is coaxially connected to the lower end of the shaft portion 21. The valve portion 22 is disposed in the valve chamber 12 and the valve orifice 13. The valve portion 22 faces the valve orifice 13 and the valve seat 14 in the up-down direction. When the valve portion 22 comes into contact with the valve seat 14, the valve orifice 13 closes. When the valve portion 22 moves away from the valve seat 14, the valve orifice 13 opens, and a throttled flow path is formed between the valve portion 22 and the valve orifice 13.

[0031] The rotor case 30 is made of a metal such as non-magnetic stainless steel. In this specification, "non-magnetic" refers to the property of not being magnetized even when placed in a magnetic field (including the property of not being substantially magnetized). The rotor case 30 may be made of a synthetic resin. The rotor case 30 has an overall cylindrical shape. The rotor case 30 integrally has a first portion 31, a second portion 32, and a connecting portion 33.

[0032] The first part 31 has a cylindrical shape. The first part 31 has a male thread 31s. The male thread 31s is disposed on the lower part of the outer circumferential surface of the first part 31. The first part 31 is disposed in the mounting hole 17 of the main body member 11, and the male thread 31s of the first part 31 is screwed into the female thread 11t of the main body member 11. The first part 31 (i.e., the rotor case 30) is attached to the main body member 11 by a screw structure. In the mounting hole 17, the space between the main body member 11 and the first part 31 is sealed with an O-ring 39. The flange portion 18c of the sleeve 18 and the valve body support plate 19 are held between the lower end of the first part 31 and the holding surface 17a of the main body member 11. The first part 31 has a bearing installation surface 31a which is an annular flat surface facing upward. The bearing installation surface 31a is disposed on the inner circumferential surface of the first part 31.

[0033] The second portion 32 has a cylindrical shape. The inner diameter of the second portion 32 is larger than the outer diameter of the first portion 31. The connecting portion 33 has a circular flat plate shape. The inner peripheral edge of the connecting portion 33 is connected to the upper end of the first portion 31, and the outer peripheral edge of the connecting portion 33 is connected to the lower end of the second portion 32.

[0034] The bearing 35 is, for example, a radial ball bearing. The bearing 35 is disposed inside the first portion 31. The lower end of the outer ring of the bearing 35 is in contact with the bearing installation surface 31a. The bearing 35 may be a thrust ball bearing.

[0035] The rotor 40 has an overall cylindrical shape. The rotor 40 is disposed inside the second portion 32 of the rotor case 30. The rotor 40 integrally includes a cylindrical portion 41, a disk portion 42, and a connecting portion 43.

[0036] The cylindrical portion 41 has a plurality of N poles and a plurality of S poles. The plurality of N poles and the plurality of S poles are alternately arranged at equal angular intervals in the circumferential direction on the inner peripheral surface of the cylindrical portion 41. The plurality of N poles and the plurality of S poles extend in the vertical direction. The cylindrical portion 41 has, for example, five N poles and five S poles. The disc portion 42 is connected to the lower end of the cylindrical portion 41. The connecting portion 43 has a cylindrical shape. The connecting portion 43 is arranged coaxially in the center of the disc portion 42. The rotor 40 is a magnet rotor.

[0037] The drive shaft 50 is made of synthetic resin or metal. The drive shaft 50 has an overall cylindrical shape. The drive shaft 50 has a male thread 51s. The male thread 51s is disposed on the outer peripheral surface of the lower part of the drive shaft 50. The male thread 51s is screwed into the female thread 21t of the valve body 20. The drive shaft 50 may have a female thread and the valve body 20 may have a male thread. The female thread 21t and the male thread 51s are a feed screw mechanism that moves the valve body 20 in the vertical direction. The center part of the drive shaft 50 is rotatably supported by the bearing 35. The drive shaft 50 has a support surface 50a, which is an annular flat surface facing downward. The upper end of the inner ring of the bearing 35 is in contact with the support surface 50a. The upper part of the drive shaft 50 is fitted into the connecting part 43. The drive shaft 50 rotates together with the rotor 40.

[0038] The inner case 60 is made of, for example, a non-magnetic metal such as stainless steel. The inner case 60 may be made of a synthetic resin. The inner case 60 has a peripheral wall portion 61, a bottom wall portion 62, and an annular portion 63, which are integrally formed.

[0039] The peripheral wall portion 61 has a cylindrical shape. The peripheral wall portion 61 has a plurality of protruding portions 61a. The plurality of protruding portions 61a are disposed on the upper portion of the inner peripheral surface of the peripheral wall portion 61. The bottom wall portion 62 has a disk shape. The outer peripheral edge of the bottom wall portion 62 is connected to the lower end (first end) of the peripheral wall portion 61. The annular portion 63 has an annular plate shape. The inner peripheral edge of the annular portion 63 is connected to the upper end (second end) of the peripheral wall portion 61. The outer peripheral edge of the annular portion 63 is joined to the upper end (one end) of the second part 32 of the rotor case 30 over the entire circumference. The peripheral wall portion 61 and the bottom wall portion 62 are disposed inside the rotor 40. The second part 32 of the rotor case 30 and the inner case 60 form a rotor space 65. The rotor 40 is disposed in the rotor space 65. The rotor space 65 is sealed from the outside of the motor-operated valve 1. The rotor space 65 is connected to the valve chamber 12 through a gap. The refrigerant of the valve chamber 12 is introduced into the rotor space 65.

[0040] As shown in FIGS. 7 to 11, the stator unit 8 includes a housing 80, a stator 90, a control device 100, and a magnetic sensor 110. The control device 100 includes a housing 80, a stator 90, a control device 100, and a magnetic sensor 110.

[0041] The housing 80 is made of synthetic resin and includes a housing main body 81 and a cover body 85.

[0042] The housing main body 81 integrally has a peripheral wall portion 82, a bottom wall portion 83, and a support portion 84. The peripheral wall portion 82 has a cylindrical shape. The bottom wall portion 83 has a disk shape. The bottom wall portion 83 is connected to the lower end of the peripheral wall portion 82. The support portion 84 has a cylindrical shape. The support portion 84 is coaxially connected to the lower surface of the bottom wall portion 83. The outer diameter of the support portion 84 is the same as the inner diameter of the peripheral wall portion 61 of the inner case 60. The support portion 84 has a plurality of recesses 84a. The plurality of recesses 84a are arranged on the upper part of the outer circumferential surface of the support portion 84. The support portion 84 is arranged in the inner case 60, and the plurality of protrusions 61a of the inner case 60 are fitted into the plurality of recesses 84a. The support portion 84 is fitted into the inner case 60. The gap between the bottom wall portion 83 and the annular portion 63 of the inner case 60 is sealed by an O-ring 89.

[0043] The lid body 85 integrally has a lid portion 86 and a connector portion 87. The lid portion 86 has a disk shape. The outer peripheral edge of the lid portion 86 is joined to the upper end of the peripheral wall portion 82. The connector portion 87 has an elongated cylindrical shape. The connector portion 87 extends upward from the center of the upper surface of the lid portion 86. The peripheral wall portion 82, the bottom wall portion 83, and the lid portion 86 form a control device space 88.

[0044] As shown in FIGS. 12 to 17, the stator 90 has a laminated core 91, a bobbin 92, a plurality of coils 93, and a plurality of coil terminals 94.

[0045] The laminated core 91 has a central portion 91a and a plurality of pole portions 91b integrally therewith. The central portion 91a has a cylindrical shape. The central portion 91a is arranged coaxially with the rotor 40. The plurality of pole portions 91b extend radially (perpendicular to the axis L) from the central portion 91a. The plurality of pole portions 91b are arranged at equal angular intervals in the circumferential direction on the outer circumferential surface of the central portion 91a. The laminated core 91 has, for example, three pole portions 91b. The laminated core 91 is formed by stacking a plurality of thin electromagnetic steel sheets. An insulating film is formed on the surface of the electromagnetic steel sheets. The electromagnetic steel sheets are arranged along the extension direction of the plurality of pole portions 91b.

[0046] The bobbin 92 is made of synthetic resin. The bobbin 92 has a plurality of sleeves 92a covering the plurality of pole portions 91b. The pole portion 91b is disposed inside the sleeve portion 92a. The pole portion 91b penetrates the sleeve portion 92a. The plurality of coils 93 are wires wound around the plurality of sleeves 92a of the bobbin 92. The plurality of coils 93 are disposed in the plurality of pole portions 91b. The plurality of coil terminals 94 extend upward from the bobbin 92. The plurality of coil terminals 94 are electrically connected to the plurality of coils 93.

[0047] The stator 90 is embedded in the support portion 84 of the housing 80. The stator 90 is disposed inside the peripheral wall portion 61 of the inner case 60 together with the support portion 84 of the housing 80. The rotor 40 is disposed outside the peripheral wall portion 61. The rotor 40 and the stator 90 constitute a stepping motor 98. Note that the motor-operated valve 1 may have another type of motor, such as a brushless DC motor.

[0048] The control device 100 is disposed in the control device space 88. The control device 100 has a board 101, a terminal component 102, and a computer (not shown). The board 101 is a printed circuit board, and electronic components including a computer are mounted on the board 101. A plurality of coil terminals 94 of the stator 90 are connected to the board 101. The terminal component 102 has a plurality of connector terminals 103. One end of each of the plurality of connector terminals 103 is connected to the board 101, and the other end is disposed inside the connector portion 87. The computer is responsible for controlling the motor-operated valve 1.

[0049] The magnetic sensor 110 is a sensor having a Hall element that outputs a signal (digital signal) according to the direction of the magnetic field. The magnetic sensor 110 is disposed under the support portion 84 of the housing 80. The magnetic sensor 110 is disposed between adjacent pole portions 91b in the support portion 84. The magnetic sensor 110 faces the magnetic poles (N pole and S pole) of the rotor 40 in the radial direction via the peripheral wall portion 61 of the inner case 60. The magnetic sensor 110 detects the magnetism of the rotor 40. The magnetic sensor 110 is electrically connected to the substrate 101, and a computer detects the rotational position of the rotor 40 based on the signal from the magnetic sensor 110.

[0050] In the electric valve 1, the main body member 11 (valve chamber 12, valve port 13, valve seat 14, mounting hole 17), sleeve 18, valve body support plate 19, valve body 20, rotor case 30, bearing 35, rotor 40, drive shaft 50, inner case 60, housing main body 81, cover body 85 (cover portion 86, connector portion 87), and stator 90 each have a central axis that coincides with the axis L.

[0051] Next, the operation of the motor-operated valve 1 will be described.

[0052] In the motor-operated valve 1, current is supplied to the multiple coils 93 of the stator 90 to rotate the rotor 40 in a first direction. The drive shaft 50 rotates together with the rotor 40. Due to the feed screw action between the male thread 51s of the drive shaft 50 and the female thread 21t of the valve body 20, the valve body 20 moves downward, reducing the opening area of ​​the valve port 13 (throttled flow passage). When the valve body 20 comes into contact with the valve seat 14 to close the valve port 13, the motor-operated valve 1 is fully closed.

[0053] In the motor-operated valve 1, current is supplied to the multiple coils 93 of the stator 90 to rotate the rotor 40 in the second direction. The drive shaft 50 rotates together with the rotor 40. Due to the feed screw action between the male thread 51s of the drive shaft 50 and the female thread 21t of the valve body 20, the valve body 20 moves upward, and the opening area of ​​the valve orifice 13 increases. When the valve body 20 is furthest away from the valve orifice 13, the motor-operated valve 1 is in a fully open state. When the motor-operated valve 1 is in a fully open state, the opening area of ​​the valve orifice 13 is at its maximum.

[0054] Next, a manufacturing method of the motor-operated valve 1 will be described.

[0055] The sleeve 18 and the valve body support plate 19 are placed in the mounting hole 17 of the main body member 11. The rotor case 30 (first part 31) is inserted into the mounting hole 17 of the main body member 11 while rotating, and the rotor case 30 is attached to the main body member 11. The sleeve 18 and the valve body support plate 19 are held by the main body member 11 and the rotor case 30. The valve body 20 is inserted into the valve body support plate 19 and the sleeve 18. The bearing 35 is fitted into the first part 31 of the rotor case 30. The upper part of the drive shaft 50 is fitted into the connecting part 43 of the rotor 40. The drive shaft 50 is inserted into the bearing 35, and the male thread 51s of the drive shaft 50 is screwed into the female thread 21t of the valve body 20. The center part of the drive shaft 50 is fitted into the bearing 35. The peripheral wall portion 61 and the bottom wall portion 62 of the inner case 60 are inserted into the rotor 40, and the annular portion 63 of the inner case 60 is welded to the upper end of the rotor case 30 (the second portion 32). In this way, the valve body assembly 5 is produced.

[0056] A laminated core 91 is placed in a molding die for a stator, and a bobbin 92 is injection molded integrally with the laminated core 91. Then, a wire is wound around multiple sleeve portions 92a of the bobbin 92, and multiple coils 93 are formed in pole portions 91b of the laminated core 91. In this manner, a stator 90 is produced.

[0057] The stator 90 is placed in a molding die for the housing body, and the housing body 81 is injection molded integrally with the stator 90. The magnetic sensor 110 is attached to the support portion 84 of the housing body 81. Wiring (not shown) that electrically connects the magnetic sensor 110 and the substrate 101 is embedded in the housing body 81. The lid body 85 is injection molded using a molding die for the lid body. The control device 100 is placed inside the peripheral wall portion 82 of the housing body 81, and the outer periphery of the lid portion 86 of the lid body 85 is ultrasonically welded (or infrared ray welded) to the upper end of the peripheral wall portion 82. This completes the stator unit 8.

[0058] The support portion 84 of the stator unit 8 is inserted into the inner case 60 of the valve body assembly 5, and the support portion 84 is fitted into the inner case 60. The multiple protrusions 61a of the inner case 60 fit into the multiple recesses 84a of the support portion 84, and the stator unit 8 is fixed to the valve body assembly 5. In this way, the motor-operated valve 1 is completed.

[0059] As described above, the motor-operated valve 1 has the cylindrical rotor case 30, the cylindrical rotor 40 arranged inside the rotor case 30, the valve body 20 that moves in response to the rotation of the rotor 40, and the stator 90 arranged inside the rotor 40 and constituting a stepping motor 98 together with the rotor 40. As a result, the outer diameter of the motor-operated valve 1 is smaller than in a configuration in which the stator is arranged outside the rotor. Therefore, the motor-operated valve 1 can be arranged in a relatively small space.

[0060] The motor-operated valve 1 also has an inner case 60. The inner case 60 integrally has a cylindrical peripheral wall portion 61, a disk-shaped bottom wall portion 62 connected to the lower end of the peripheral wall portion 61, and an annular portion 63 whose inner peripheral edge is connected to the upper end of the peripheral wall portion 61. The outer peripheral edge of the annular portion 63 is joined to the upper end of the rotor case 30. The peripheral wall portion 61 and the bottom wall portion 62 are disposed inside the rotor 40. The stator 90 is disposed inside the peripheral wall portion 61. In this manner, the rotor case 30 and the inner case 60 form a rotor space 65 in which the rotor 40 is disposed. A refrigerant is introduced into the rotor space 65. The rotor space 65 is sealed against the space inside the peripheral wall portion 61 in which the stator 90 is disposed. Therefore, the space in which the stator 90 is disposed can be partitioned from the rotor space 65.

[0061] The motor-operated valve 1 also has a housing 80 made of synthetic resin. The housing 80 has a cylindrical support portion 84 in which the stator 90 is embedded. The support portion 84 is fitted into the inner case 60. In this manner, the stator 90 can be protected by the support portion 84. Furthermore, by fitting the support portion 84 into the inner case 60, the stator 90 can be appropriately positioned inside the inner case 60.

[0062] The housing 80 also has an elongated cylindrical connector portion 87. The connector portion 87 extends in the axial direction (axis L direction) of the rotor 40. This makes it possible to reduce the installation area of ​​the motor-operated valve 1 (area when viewed from the axis L direction).

[0063] Further, the stator 90 is arranged coaxially with the rotor 40, and includes a laminated core 91 having a plurality of pole portions 91b extending in the radial direction, and a plurality of coils 93 arranged on the plurality of pole portions 91b. The electromagnetic steel sheets of the laminated core 91 are arranged along the extension direction of the plurality of pole portions 91b (direction perpendicular to the axis L). In the laminated core 91, magnetic flux passes in the extension direction of the plurality of pole portions 91b, and the current flowing between the electromagnetic steel sheets is limited. Therefore, the iron loss in the laminated core 91 can be reduced.

[0064] The motor-operated valve 1 also has a magnetic sensor 110 that detects the magnetism of the rotor 40. The magnetic sensor 110 is disposed between the pole parts 91b on the support part 84 (FIG. 7). In this manner, the magnetic sensor 110 is disposed near the rotor 40 and faces the rotor 40 in the radial direction.

[0065] Further, the motor-operated valve 1 has a drive shaft 50 that rotates together with the rotor 40. The valve element 20 has a female thread 21t. The drive shaft 50 has a male thread 51s that is screwed into the female thread 21t. The female thread 21t and the male thread 51s form a feed screw mechanism that moves the valve element 20. In this manner, the valve element 20 can be moved with a relatively simple configuration.

[0066] Next, a valve device according to a second embodiment of the present invention will be described with reference to FIG.

[0067] As shown in FIG. 18, the valve device 2 according to the second embodiment has the motor-operated valve 1 according to the first embodiment and a flow path block 150.

[0068] The flow path block 150 has a rectangular parallelepiped shape. The flow path block 150 is made of a metal such as an aluminum alloy. The upper surface of the flow path block 150 is a mounting surface 151 on which the motor-operated valve 1 is disposed.

[0069] The flow passage block 150 has a first passage 155, a second passage 156, and a mounting hole 157. The mounting hole 157 is disposed in the mounting surface 151. The first passage 155 extends forward from the mounting hole 157. The second passage 156 extends downward from the mounting hole 157.

[0070] The flow passage block 150 has a female thread 150t. The female thread 150t is disposed on the inner peripheral surface of the mounting hole 157. The lower portion 11b of the main body member 11 of the motor-operated valve 1 is disposed in the mounting hole 157, and the male thread 11s of the main body member 11 is screwed into the female thread 150t of the flow passage block 150. The motor-operated valve 1 is attached to the flow passage block 150 by a screw structure, with a jig attached to the hexagonal upper portion 11a of the main body member 11 and rotating it around the axis L. In the mounting hole 157, the space between the main body member 11 and the flow passage block 150 is sealed by O-rings 158 and 159 disposed in the annular grooves 11d and 11e. The connector portion 87 of the motor-operated valve 1 faces upward. The first passage 155 is connected to the valve chamber 12 of the motor-operated valve 1 via the mounting hole 157 and the first connection passage 15. The second passage 156 is connected to the valve port 13 of the motor-operated valve 1 via a second connection passage 16 .

[0071] The valve device 2 may have a configuration in which the main body member 11 of the motor-operated valve 1 is omitted and the rotor case 30 is directly attached to the flow path block 150. In this configuration, the flow path block 150 has a valve chamber, a valve port, a valve seat, and a mounting hole that are the same as (including substantially the same as) those of the motor-operated valve 1.

[0072] Next, a valve device according to a third embodiment of the present invention will be described with reference to FIG.

[0073] As shown in FIG. 19, the valve device 3 according to the second embodiment has a plurality of motor-operated valves 1 according to the first embodiment and a flow path block 250.

[0074] The flow path block 250 has a rectangular parallelepiped shape. The flow path block 250 is made of a metal such as an aluminum alloy. The upper surface of the flow path block 250 is a mounting surface 251 on which the multiple motor-operated valves 1 are arranged.

[0075] The flow passage block 250 has a plurality of mounting holes (not shown). The plurality of mounting holes are arranged on a mounting surface 251. A plurality of female threads are arranged on the inner peripheral surfaces of the plurality of mounting holes. The lower parts 11b of the main body members 11 of the plurality of motor-operated valves 1 are arranged in the plurality of mounting holes, and the male threads 11s of the main body member 11 are screwed into the female threads of the flow passage block 250. The connector parts 87 of the plurality of motor-operated valves 1 face upward.

[0076] The valve devices 2 and 3 have the same effects as the motor-operated valve 1.

[0077] Furthermore, in the valve device 3, the installation area of ​​each of the multiple motor-operated valves 1 is small, so the flow path block 250 can be made small. Furthermore, in the valve device 3, the connector parts 87 of each of the multiple motor-operated valves 1 face the same direction (upward). Therefore, in a system in which the valve device 3 is incorporated, it is necessary to provide a space for arranging cables connected to the connector parts 87 of the multiple motor-operated valves 1 only above the valve device 3, so that the valve device 3 can be arranged in a relatively small space.

[0078] In this specification, terms indicating shapes such as "cylinder", "column", "rectangular parallelepiped", etc. are also used for members or parts of members that have substantially the shape of the term. For example, a "cylindrical member" includes a cylindrical member and a substantially cylindrical member.

[0079] 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]

[0080] 1...motor-operated valve, 2...valve device, 3...valve device, 5...valve body assembly, 8...stator unit, 10...valve body, 11...body member, 11a...upper portion, 11b...lower portion, 11c...upper surface, 11d...annular groove, 11e...annular groove, 11s...male thread, 11t...female thread, 12...valve chamber, 13...valve port, 14...valve seat, 15...first connecting passage, 16...second connecting passage, 17...mounting hole, 17a...retaining surface, 18...sleeve, 18a...small diameter portion, 18 b...large diameter portion, 18c...flange portion, 19...valve body support plate, 20...valve body, 21...shaft portion, 21a...upper portion, 21b...lower portion, 21c...screw hole, 21t...female thread, 22...valve portion, 30...rotor case, 31...first portion, 31a...bearing installation surface, 31s...male thread, 32...second portion, 33...connection portion, 35...bearing, 39...O-ring, 40...rotor, 41...cylindrical portion, 42...disk portion, 43...connection portion, 50...drive shaft, 50a...support holding surface, 51s...male thread, 60...inner case, 61...circumferential wall portion, 61a...projection portion, 62...bottom wall portion, 63...annular portion, 65...rotor space, 80...housing, 81...housing body, 82...circumferential wall portion, 83...bottom wall portion, 84...support portion, 84a...recessed portion, 85...lid body, 86...lid portion, 87...connector portion, 88...controller space, 89...O-ring, 90...stator, 91...laminated core, 91a...center portion, 91b...pole portion, 92...bobbin , 92a... sleeve portion, 93... coil, 94... coil terminal, 98... stepping motor, 100... control device, 101... board, 102... terminal part, 103... connector terminal, 110... magnetic sensor, 150... flow path block, 150t... female screw, 151... mounting surface, 155... first passage, 156... second passage, 157... mounting hole, 158... O-ring, 159... O-ring, 250... flow path block, 251... mounting surface, L... axis

Claims

1. A cylindrical rotor case; a cylindrical magnet rotor disposed inside the rotor case; a valve body that moves in response to rotation of the magnet rotor; a stator disposed inside the magnet rotor and constituting a motor together with the magnet rotor; an inner case integrally including a cylindrical peripheral wall portion, a disk-shaped bottom wall portion connected to a first end of the peripheral wall portion, and an annular portion having an inner peripheral edge connected to a second end of the peripheral wall portion; An outer circumferential edge of the annular portion is joined to one end of the rotor case, the peripheral wall portion and the bottom wall portion are disposed inside the magnet rotor, The motor-operated valve, wherein the stator is disposed inside the peripheral wall portion.

2. The motor-operated valve further includes a housing made of a synthetic resin, the housing has a cylindrical support portion in which the stator is embedded, The motor-operated valve according to claim 1 , wherein the support portion is fitted to the inner case.

3. The housing further includes a cylindrical connector portion, The motor-operated valve according to claim 2 , wherein the connector portion extends in an axial direction of the magnet rotor.

4. 4. The motor-operated valve according to claim 3, wherein the stator comprises a laminated core arranged coaxially with the magnet rotor and having a plurality of pole portions extending radially, and a plurality of coils arranged at the pole portions.

5. The motor-operated valve further includes a magnetic sensor that detects magnetism of the magnet rotor, The motor-operated valve according to claim 4 , wherein the magnetic sensor is disposed at a location between the pole portions on the support portion.

6. The motor-operated valve further includes a drive shaft that rotates together with the magnet rotor, The valve body has a female thread and the drive shaft has a male thread that is screwed into the female thread, or the drive shaft has a female thread and the valve body has a male thread that is screwed into the female thread, The motor-operated valve according to claim 1 , wherein the female screw and the male screw form a feed screw mechanism that moves the valve body.

7. A valve device having at least one motor-operated valve and a flow path block having a mounting surface on which the motor-operated valve is disposed, The motor-operated valve is A cylindrical rotor case; a cylindrical magnet rotor disposed inside the rotor case; a valve body that moves in response to rotation of the magnet rotor; a stator disposed inside the magnet rotor and constituting a motor together with the magnet rotor; an inner case integrally including a cylindrical peripheral wall portion, a disk-shaped bottom wall portion connected to a first end of the peripheral wall portion, and an annular portion having an inner peripheral edge connected to a second end of the peripheral wall portion; An outer circumferential edge of the annular portion is joined to one end of the rotor case, the peripheral wall portion and the bottom wall portion are disposed inside the magnet rotor, The stator is disposed inside the peripheral wall portion.

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