Valve body assembly and electric valve

Abstract

[Problem] To provide a compact valve body assembly and electric valve that can be incorporated in series with straight conduits. [Solution] A valve body assembly 5 has a cylindrical valve body 10 having a valve chamber 18, a cylindrical rotor 30 disposed in the valve chamber 18, and a valving element 41 disposed on the inner side of the rotor 30. The valve body 10 has a connecting flow passage 12p connecting the valve chamber 18 and a first conduit 8, a valve port 16 connecting the valve chamber 18 and a second conduit 9; and a valve seat 17 surrounding the valve port 16 and disposed on the inner side of the rotor 30. The connecting flow passage 12p, the valve seat 17, and the valve port 16 are arranged coaxially with the rotor 30.

Description

Technical Field

[0001] The present invention relates to a valve body assembly and an electric valve having the valve body assembly.

Background Art

[0002] Patent Document 1 discloses an example of a conventional electric valve. This electric valve is incorporated in, for example, an air conditioner and is used to control the flow rate of refrigerant. The electric valve has a valve body assembly and a stator unit. The valve body assembly has a refrigerant inlet portion, a flow rate control portion, and a refrigerant outlet portion that form a linear flow path, and a magnet rotor disposed inside the flow rate control portion. The stator unit has a stator disposed outside the flow rate control portion. The magnet rotor and the stator constitute a stepping motor. The electric valve is incorporated in series in a linear pipe of an air conditioner.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The electric valve of Patent Document 1 has a cylindrical valve body and a coil spring wound around the valve body. The valve body penetrates through the magnet rotor. Therefore, the valve body becomes relatively long, and it is difficult to reduce the size of the electric valve.

[0005] Therefore, an object of the present invention is to provide a small-sized valve body assembly and an electric valve that can be incorporated in series in a linear pipe.

Means for Solving the Problems

[0006] To achieve the above objective, a valve body assembly according to one aspect of the present invention comprises a cylindrical valve body having a valve chamber, a cylindrical magnet rotor disposed in the valve chamber, and a valve body disposed inside the magnet rotor, wherein a first conduit is connected to a first end of the valve body, a second conduit is connected to a second end of the valve body, the valve body comprises a connecting passage connecting the valve chamber and the first conduit, a valve port connecting the valve chamber and the second conduit, and a valve seat surrounding the valve port and disposed inside the magnet rotor, wherein the valve body approaches the valve seat when the magnet rotor rotates in a first direction and moves away from the valve seat when it rotates in a second direction, and the connecting passage, the valve seat, and the valve port are arranged coaxially with the magnet rotor.

[0007] In the present invention, it is preferable that the valve body assembly further includes a leaf spring attached to the valve body, which elastically deforms when the magnet rotor rotates further in the first direction after the valve body has come into contact with the valve seat.

[0008] In the present invention, it is preferable that the leaf spring has an outer portion fixed to the magnet rotor, an inner portion fixed to the valve body, and a connecting portion connecting the outer portion and the inner portion.

[0009] In the present invention, it is preferable that the outer portion and the inner portion have an annular plate shape, the outer diameter of the inner portion is smaller than the inner diameter of the outer portion, the connecting portion connects the inner peripheral edge of the outer portion and the outer peripheral edge of the inner portion, and a flow path is formed between the outer portion and the inner portion.

[0010] In the present invention, it is preferable that the valve body comprises a cylindrical case, a lid member, and a valve seat member, wherein the lid member is attached to the first end of the case, the valve seat member has a closing portion attached to the second end of the case, and a cylindrical support portion extending from the closing portion toward the lid member, the valve opening penetrates the closing portion and the support portion, and the valve seat is positioned at the tip of the support portion.

[0011] In the present invention, it is preferable that the inner circumferential surface of the magnet rotor is provided with an internal screw, and the outer circumferential surface of the support portion is provided with an external screw that is screwed into the internal screw.

[0012] In the present invention, it is preferable that when the valve body is furthest from the valve seat, the tip of the support portion is closer to the cover member than the female screw.

[0013] To achieve the above objective, an electric valve according to another aspect of the present invention is an electric valve comprising a valve body assembly and a stator unit having a stator that, together with the magnet rotor, constitutes a motor, wherein the stator unit has an inner space extending from a first end face to a second end face of the stator unit and an opening provided on the outer surface of the stator unit, extending from the first end face to the second end face and communicating with the inner space, and the valve body assembly is disposed in the inner space. [Effects of the Invention]

[0014] According to the present invention, the valve body has a cylindrical shape, and a magnet rotor is arranged in the valve chamber of the valve body. A first conduit is connected to the first end of the valve body, and a second conduit is connected to the second end of the valve body. The valve body has a connecting passage that connects the valve chamber to the first conduit, a valve port that connects the valve chamber to the second conduit, and a valve seat that surrounds the valve port and is arranged inside the magnet rotor. The connecting passage, valve seat, and valve port are arranged coaxially with the magnet rotor. As a result, the valve body assembly can be incorporated in series into a straight conduit. Furthermore, the valve body and valve seat are arranged inside the magnet rotor. Therefore, the valve body assembly can be made smaller. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view of an electric valve according to one embodiment of the present invention. [Figure 2] This is a perspective view of the valve body assembly of an electric valve. [Figure 3] It is a perspective view of a cross-section along the axis of the valve body assembly. [Figure 4] It is a cross-sectional view along the axis of the valve body assembly in the closed valve state. [Figure 5] It is a cross-sectional view along the axis of the valve body assembly in the fully open state. [Figure 6] It is a perspective view of the valve element unit of the valve body assembly. [Figure 7] It is a front view of the valve element unit. [Figure 8] It is a rear view of the valve element unit. [Figure 9] It is a side view of the valve element unit. [Figure 10] It is a cross-sectional view along the axis of the valve element unit. [Figure 11] It is a front view of the spring member of the valve element unit. [Figure 12] It is a perspective view of the stator unit of the electric valve. [Figure 13] It is a cross-sectional view taken along line XIII-XIII of FIG. 12. [Figure 14] It is a cross-sectional view taken along line XIV-XIV of FIG. 13. [Figure 15] It is a diagram for explaining the assembling method of the electric valve.

Mode for Carrying Out the Invention

[0016] Hereinafter, an electric valve according to an embodiment of the present invention will be described with reference to FIGS. 1 to 15.

[0017] Figure 1 is a perspective view of an electric valve according to one embodiment of the present invention. Figure 2 is a perspective view of the valve body assembly of the electric valve. Figure 3 is a perspective view of a cross-section along the axis of the valve body assembly. In Figure 3, the valve body unit of the valve body assembly is shown in a perspective view. Figure 4 is a cross-sectional view along the axis of the valve body assembly in the closed state. Figure 5 is a cross-sectional view along the axis of the valve body assembly in the fully open state. In Figures 4 and 5, the valve body unit is shown in a side view. Figures 6 to 9 are perspective views, front views, rear views, and side views of the valve body unit. Figure 10 is a cross-sectional view along the axis of the valve body unit. Figure 11 is a front view of the spring member of the valve body unit. Figure 12 is a perspective view of the stator unit of the electric valve. Figure 13 is a cross-sectional view along the line XIII-XIII in Figure 12. Figure 14 is a cross-sectional view along the line XIV-XIV in Figure 13. Figure 15 is a diagram illustrating the assembly method of the electric valve.

[0018] The electric valve 1 according to this embodiment is, for example, incorporated in series into a straight piping system of an air conditioner and used to control the flow rate of refrigerant.

[0019] As shown in Figure 1, the electric valve 1 comprises a valve body assembly 5 and a stator unit 6.

[0020] As shown in Figures 2 to 5, the valve body assembly 5 includes a valve body 10, a rotor 30, and a valve body unit 40.

[0021] The valve body 10 includes a case 11, a cover member 12, and a valve seat member 13. The case 11, cover member 12, and valve seat member 13 are made of metal, such as stainless steel or an aluminum alloy.

[0022] Case 11 has a cylindrical shape. Case 11 is arranged along axis L. The cover member 12 has a disc shape. The cover member 12 is coaxially joined to the first end 11a of case 11 and closes the first end 11a. The cover member 12 is the first end of the valve body 10.

[0023] The valve seat member 13 integrally includes a closing portion 14 and a support portion 15.

[0024] The closing portion 14 has a disc shape. The closing portion 14 is coaxially joined to the second end 11b of the case 11 and closes the second end 11b.

[0025] The support portion 15 has a cylindrical shape. The support portion 15 extends from the closing portion 14 toward the lid member 12 and is located inside the case 11. The support portion 15 has a male screw 15t. The male screw 15t is located on the outer circumferential surface of the support portion 15.

[0026] The valve seat member 13 has a valve opening 16 and a valve seat 17. The valve opening 16 penetrates the closing portion 14 and the support portion 15. The valve seat 17 is provided at the tip 15a of the support portion 15 and surrounds the valve opening 16. The closing portion 14, the support portion 15, the valve opening 16, and the valve seat 17 are arranged coaxially. The closing portion 14 of the valve seat member 13 is the second end of the valve body 10.

[0027] The case 11, the lid member 12, and the valve seat member 13 form a valve chamber 18. A first conduit 8 is joined to the outer surface 12c of the lid member 12. The first conduit 8 is connected to the valve chamber 18 through a connecting passage 12p of the lid member 12. The connecting passage 12p connects the valve chamber 18 and the first conduit 8. A second conduit 9 is joined to the outer surface 14c of the closure section 14. The second conduit 9 is connected to the valve chamber 18 through a valve opening 16. The valve opening 16 connects the valve chamber 18 and the second conduit 9. The first conduit 8 and the second conduit 9 are the piping for the air conditioner.

[0028] The rotor 30 is a magnetic rotor. The rotor 30 has a cylindrical shape and is positioned in the valve chamber 18 along its axis L. The rotor 30 is rotatable relative to the valve body 10. The rotor 30 has a first part 31, a second part 32, and a third part 33.

[0029] The first part 31 has a cylindrical shape. The first part 31 is made of, for example, ferrite. The first part 31 has multiple magnetic poles (multiple north poles and multiple south poles). The multiple north poles and multiple south poles are arranged alternately at equal angular intervals in the circumferential direction. The multiple north poles and multiple south poles extend in the direction of the axis L. The first part 31 has, for example, 12 north poles and 12 south poles. The angle between two adjacent magnetic poles about the axis L is 15 degrees.

[0030] The second part 32 has a cylindrical shape and is coaxially positioned inside the first part 31. The second part 32 is made of, for example, synthetic resin and is integrally molded with the first part 31. The second part 32 has a retaining surface 32a. The retaining surface 32a is an annular plane facing the valve seat member 13 and is located on the inner circumferential surface of the second part 32.

[0031] The third portion 33 has a cylindrical shape and is coaxially positioned inside the second portion 32. The third portion 33 is made of, for example, synthetic resin. The outer diameter of the third portion 33 is slightly larger than the outer diameter of the retaining surface 32a (the inner diameter of the second portion 32), and the third portion 33 is press-fitted into the second portion 32. The third portion 33 may be joined to the second portion 32. The third portion 33 has a female thread 33t. The female thread 33t is located on the inner circumferential surface of the third portion 33. The male thread 15t of the valve seat member 13 is screwed into the female thread 33t.

[0032] The inner space 35 of the rotor 30 is part of the valve chamber 18 and is a passage that connects to the valve port 16 and the connecting passage 12p of the cover member 12. The tip 15a (valve seat 17) of the support portion 15 is located in the inner space 35.

[0033] The valve body unit 40 is positioned along the axis L in the inner space 35 of the rotor 30. As shown in Figures 6 to 10, the valve body unit 40 includes a valve body 41 and a spring member 51.

[0034] The valve body 41 is made of a metal such as stainless steel or brass. The valve body 41 integrally comprises a base 42, a valve portion 43, and a shaft portion 44. The base 42 has a disc shape. The valve portion 43 has a generally cylindrical shape. The valve portion 43 extends from the base 42 toward the valve seat member 13. The tip of the valve portion 43 has a tapered shape and faces the valve opening 16 and the valve seat 17. The shaft portion 44 has a cylindrical shape. The shaft portion 44 extends from the base 42 toward the cover member 12.

[0035] Furthermore, the valve body 41 has a sleeve 45. The sleeve 45 has a cylindrical shape. A shaft portion 44 is press-fitted into the sleeve 45. The shaft portion 44 may be joined to the sleeve 45. The base portion 42, valve portion 43, shaft portion 44 and sleeve 45 are arranged coaxially. The valve body 41 is located inside the rotor 30. The valve body 41 only needs to be substantially located inside the rotor 30.

[0036] The spring member 51 is a leaf spring. The spring member 51 is manufactured by press-forming sheet metal. As shown in Figure 11, the spring member 51 has an outer portion 52, an inner portion 53, and a plurality of connecting portions 54.

[0037] The outer portion 52 and the inner portion 53 have an annular plate shape. The inner diameter of the outer portion 52 is larger than the outer diameter of the valve body 41 (base portion 42). The outer diameter of the inner portion 53 is smaller than the inner diameter of the outer portion 52. The inner portion 53 is arranged coaxially with the outer portion 52. Also, the position of the inner portion 53 in the axial direction L is closer to the valve seat member 13 than the position of the outer portion 52 in the axial direction L. The position of the inner portion 53 in the axial direction L may be the same as the position of the outer portion 52 in the axial direction L. The outer portion 52 may have a shape such as a C shape, or a notch in part of the annular shape.

[0038] The multiple connecting portions 54 have a rectangular plate shape. The multiple connecting portions 54 connect the inner periphery of the outer portion 52 to the outer periphery of the inner portion 53. The multiple connecting portions 54 are arranged at equal intervals around the axis L, and a flow path is formed between the outer portion 52 and the inner portion 53. The multiple connecting portions 54 are elastically deformable.

[0039] The shaft portion 44 of the valve body 41 is inserted into the inner portion 53, and the inner portion 53 is sandwiched between the base portion 42 and the sleeve 45 of the valve body 41. As a result, the spring member 51 is fixed coaxially to the valve body 41, and the spring member 51 and the valve body 41 constitute the valve body unit 40. In addition, the sleeve 45 may be omitted in the valve body 41, and the shaft portion 44 may be press-fitted into the inner portion 53. Alternatively, the inner portion 53 may be crimped or welded to the valve body 41. The outer portion 52 is sandwiched between the second portion 32 (holding surface 32a) and the third portion 33 of the rotor 30. As a result, the valve body unit 40 is fixed to the rotor 30.

[0040] The spring member 51 is not limited to the configuration described above. The spring member 51 has an inner portion fixed to the valve body 41, an outer portion fixed to the rotor 30, and a connecting portion that connects the inner portion and the outer portion and is elastically deformed so that the inner portion moves in the axial direction L relative to the outer portion, and a flow path is formed between the inner portion and the outer portion. Its shape is arbitrary as long as such a spring member has a strip shape or a cross shape. In such a spring member, the central portion (inner portion) is fixed to the valve body 41, the end portion (outer portion) of the spring member is fixed to the rotor 30, and the portion between the central portion and the end portion (connecting portion) is elastically deformed.

[0041] The stator unit 6 is positioned along the axis L. The stator unit 6 is attached to the valve body assembly 5. As shown in Figures 12 to 14, the stator unit 6 includes a stator 60 and a cover 100.

[0042] The stator 60, together with the rotor 30, constitutes a stepping motor. The rotor 30 and stator 60 may also constitute a motor other than a stepping motor. The stator 60 has a stator core 70 and a plurality of coils 88.

[0043] The stator core 70 is formed, for example, by stacking multiple thin electromagnetic steel sheets. The stator core 70 has a back yoke 71, multiple main poles 81, and multiple auxiliary poles 85.

[0044] The back yoke 71 has a roughly cylindrical shape and, when viewed from the direction of the axis L, has a C-shape (arc shape). Multiple main poles 81 and multiple auxiliary poles 85 protrude from the inner surface of the back yoke 71 toward the axis L. Multiple coils 88 are wound around the multiple main poles 81.

[0045] The cover 100 has a shape that conforms to the outer shape of the stator 60 and covers the stator 60. When viewed from the direction of the axis L, the cover 100 has a C shape (arc shape). The cover 100 is made of synthetic resin and is integrally molded with the stator 60. The inner surface of the cover 100, together with the tips of the main pole 81 and the auxiliary poles, forms the inner surface 6d of the stator unit 6. The cover 100 may be omitted in the stator unit 6.

[0046] The stator unit 6 has an inner space 6s and an opening 6e. The inner space 6s extends from the first end face 6a to the second end face 6b of the stator unit 6. The opening 6e is provided on the outer surface 6c of the stator unit 6, extends from the first end face 6a to the second end face 6b, and is connected to the inner space 6s. The inner space 6s is defined by the inner surface 6d of the stator unit 6. The diameter of the inner space 6s is the same as the diameter of the valve body assembly 5. The valve body assembly 5 is positioned in the inner space 6s. The width of the opening 6e is greater than the outer diameter of the first conduit 8 and the outer diameter of the second conduit 9.

[0047] In this embodiment, the central axes of the valve body assembly 5 (valve body 10, rotor 30, and valve body unit 40), the stator unit 6 (inner space 6s, stator 60, and cover 100), the first conduit 8, and the second conduit 9 all coincide with axis L. Axis L coincides with the rotation axis of the rotor 30.

[0048] Next, the method for attaching the stator unit 6 to the valve body assembly 5 will be explained with reference to Figures 15A to 15C.

[0049] As shown in Figure 15A, the valve body assembly 5 is connected to the first conduit 8 and the second conduit 9. The opening 6e of the stator unit 6 is positioned opposite the first conduit 8, and the stator unit 6 is moved toward the first conduit 8.

[0050] As shown in Figure 15B, the first conduit 8 is inserted into the inner space 6s through the opening 6e of the stator unit 6, and the first conduit 8 is coaxially positioned in the inner space 6s of the stator unit 6.

[0051] As shown in Figure 15C, the stator unit 6 is moved in the direction of the axis L, and the valve body assembly 5 is inserted into the inner space 6s of the stator unit 6. Then, the stator unit 6 is fixed to the valve body assembly 5 by a fixing mechanism (not shown), and the electric valve 1 is completed.

[0052] Next, the operation of the electric valve 1 will be explained with reference to Figures 4 and 5.

[0053] Current is supplied to the coil 88 of the stator unit 6 to rotate the rotor 30 in the first direction. As the rotor 30 rotates in the first direction, the screw action between the male thread 15t of the valve seat member 13 and the female thread 33t of the rotor 30 causes the rotor 30 and the valve body unit 40 to approach the valve seat member 13, and the valve portion 43 of the valve body 41 comes into contact with the valve seat 17, closing the valve opening 16. At this time, the electric valve 1 is in the closed state (Figure 4). As the rotor 30 rotates further in the first direction, the spring member 51 elastically deforms and presses the valve portion 43 against the valve seat 17. This increases the sealing performance of the valve seat 17 by the valve body 41.

[0054] Current is supplied to the coil 88 of the stator unit 6 to rotate the rotor 30 in the second direction. As the rotor 30 rotates in the second direction, the screw action between the male thread 15t of the valve seat member 13 and the female thread 33t of the rotor 30 causes the rotor 30 and the valve body unit 40 to approach the cover member 12, and the valve portion 43 of the valve body 41 moves away from the valve seat 17 and the valve port 16 opens. When the rotor 30 rotates further in the second direction and the valve portion 43 reaches the position furthest from the valve seat 17, the electric valve 1 becomes fully open (Figure 5). The refrigerant that enters the valve port 16 from the second pipeline 9 flows through the valve chamber 18 (including the inner space 35 of the rotor 30) and the connecting passage 12p of the cover member 12 and into the first pipeline 8. In the inner space 35, the refrigerant passes through the passage formed between the outer portion 52 and the inner portion 53 of the spring member 51.

[0055] When the electric valve 1 is fully open, the tip 15a of the support portion 15 is closer to the cover member 12 than the female thread 33t of the rotor 30. The inner space 35 is defined by the inner circumferential surface of the rotor 30, and the portion of this inner circumferential surface closer to the cover member 12 than the female thread 33t has relatively few irregularities. Therefore, it is possible to suppress turbulence in the refrigerant flowing through the inner space 35 caused by the female thread 33t.

[0056] As described above, the electric valve 1 comprises a valve body assembly 5 and a stator unit 6. The valve body assembly 5 comprises a valve body 10 having a valve chamber 18, a cylindrical rotor 30 positioned in the valve chamber 18, and a valve body 41 positioned inside the rotor 30. A first conduit 8 is connected to the cover member 12, and a second conduit 9 is connected to the valve seat member 13. The valve body 10 comprises a connecting passage 12p connecting the valve chamber 18 and the first conduit 8, a valve port 16 connecting the valve chamber 18 and the second conduit 9, and a valve seat 17 surrounding the valve port 16 and positioned inside the rotor 30. The valve body 41 approaches the valve seat 17 when the rotor 30 rotates in a first direction, and moves away from the valve seat 17 when it rotates in a second direction. The connecting passage 12p, the valve seat 17, and the valve port 16 are arranged coaxially with the rotor 30. As a result, the valve body assembly 5 can be installed in series in a straight pipeline. Furthermore, since the valve body 41 and valve seat 17 are located inside the rotor 30, the valve body assembly 5 can be made smaller.

[0057] Furthermore, the valve body assembly 5 has a spring member 51 that is attached to the valve body 41 and elastically deforms when the rotor 30 rotates further in the first direction after the valve body 41 has come into contact with the valve seat 17. In this way, the valve body assembly 5 can be made smaller and the valve body 41 can be effectively pressed against the valve seat 17 by the spring member 51 which can be placed in a relatively small space.

[0058] Furthermore, the spring member 51 has an annular flat plate shaped outer portion 52 fixed to the rotor 30, an annular flat plate shaped inner portion 53 fixed to the valve body 41, and a plurality of connecting portions 54 connecting the outer portion 52 and the inner portion 53. The spring member 51 forms a flow path for refrigerant to flow between the outer portion 52 and the inner portion 53. In this way, the valve body 41, which is located inside the rotor 30, can be attached to the rotor 30 with a relatively simple configuration. In addition, obstruction of the refrigerant flow by the spring member 51 can be suppressed.

[0059] Furthermore, the valve body 10 includes a cylindrical case 11, a cover member 12, and a valve seat member 13. The cover member 12 is attached to the first end 11a of the case 11. The valve seat member 13 has a closing portion 14 attached to the second end 11b of the case 11, and a cylindrical support portion 15 extending from the closing portion 14 toward the cover member 12. The valve opening 16 penetrates the closing portion 14 and the support portion 15. The valve seat 17 is positioned at the tip 15a of the support portion 15. In this way, the valve seat 17 can be positioned inside the rotor 30. Therefore, the valve body assembly 5 can be made smaller.

[0060] Furthermore, a female thread 33t is provided on the inner circumferential surface of the rotor 30. A male thread 15t that screws into the female thread 33t is provided on the outer circumferential surface of the support portion 15. In this way, with a relatively simple configuration, when the rotor 30 rotates in the first direction, the valve body 41 approaches the valve seat 17, and when it rotates in the second direction, the valve body 41 moves away from the valve seat 17.

[0061] Furthermore, when the valve body 41 is furthest from the valve seat 17 (fully open), the tip 15a of the support portion 15 is closer to the cover member 12 than the female thread 33t. This arrangement helps to suppress turbulence in the refrigerant flowing through the inner space 35.

[0062] Furthermore, the stator unit 6 has an inner space 6s extending from the first end face 6a to the second end face 6b, and an opening 6e provided on the outer surface 6c of the stator unit 6, extending from the first end face 6a to the second end face 6b and connecting to the inner space 6s. The valve body assembly 5 is placed in the inner space 6s. In this way, the stator unit 6 can be attached to the valve body assembly 5 after the valve body assembly 5 has been incorporated into the pipeline.

[0063] In this specification, terms indicating shapes such as "cylinder" and "column" are also used to refer to members or parts of members that substantially have the shape of those terms. For example, "cylindrical member" includes both cylindrical members and substantially cylindrical members. Furthermore, in this specification, the term "same" may include both strictly identical and substantially identical items.

[0064] Although embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Additions, deletions, design modifications, and combinations of features of the embodiments, as appropriate by those skilled in the art, are also included within the scope of the present invention, as long as they do not contradict the spirit of the invention. [Explanation of symbols]

[0065] 1...Electric valve, 8...First pipeline, 9...Second pipeline, 5... Valve body assembly, 10... Valve body, 11... Case, 12... Cover member, 13... Valve seat member, 14... Closure part, 15... Support part, 15a... Tip, 15t... Male screw, 16...valve orifice, 17...valve seat, 18...valve chamber 30...rotor, 33t...female thread, 40... Valve body unit, 41... Valve body, 51...spring member, 52...outer part, 53...inner part, 54...connecting part, 6... Stator unit, 60... Stator, 100... Cover L…Axis line

Claims

1. A cylindrical valve body having a valve chamber, A cylindrical magnet rotor is placed in the valve chamber, A valve body disposed inside the aforementioned magnet rotor, The valve body has a leaf spring attached to it, A first conduit is connected to the first end of the valve body, and a second conduit is connected to the second end of the valve body. The valve body includes a connecting passage that connects the valve chamber and the first pipeline, a valve opening that connects the valve chamber and the second pipeline, and a valve seat that surrounds the valve opening and is positioned inside the magnet rotor. The valve body moves closer to the valve seat when the magnet rotor rotates in the first direction, and moves away from the valve seat when it rotates in the second direction. The connecting channel, the valve seat, and the valve port are arranged coaxially with the magnet rotor. A valve body assembly in which the leaf spring elastically deforms when the magnet rotor rotates further in the first direction after the valve body has come into contact with the valve seat.

2. The valve body assembly according to claim 1, wherein the leaf spring has an outer portion fixed to the magnet rotor, an inner portion fixed to the valve body, and a connecting portion connecting the outer portion and the inner portion.

3. The outer portion and the inner portion have an annular plate shape, The outer diameter of the inner portion is smaller than the inner diameter of the outer portion. The connecting portion connects the inner peripheral edge of the outer portion and the outer peripheral edge of the inner portion. The valve body assembly according to claim 2, wherein a flow path is formed between the outer portion and the inner portion.

4. A cylindrical valve body having a valve chamber, A cylindrical magnet rotor is placed in the valve chamber, The valve body is disposed inside the magnet rotor, A first conduit is connected to the first end of the valve body, and a second conduit is connected to the second end of the valve body. The valve body includes a connecting passage that connects the valve chamber and the first pipeline, a valve opening that connects the valve chamber and the second pipeline, and a valve seat that surrounds the valve opening and is positioned inside the magnet rotor. The valve body moves closer to the valve seat when the magnet rotor rotates in the first direction, and moves away from the valve seat when it rotates in the second direction. The connecting channel, the valve seat, and the valve port are arranged coaxially with the magnet rotor. The valve body comprises a cylindrical case, a cover member, and a valve seat member. The lid member is attached to the first end of the case. The valve seat member has a closing portion attached to the second end of the case and a cylindrical support portion extending from the closing portion toward the lid member. The valve opening penetrates the closing portion and the support portion, A valve body assembly in which the valve seat is positioned at the tip of the support portion.

5. The inner circumferential surface of the aforementioned magnet rotor is provided with an internal thread. The valve body assembly according to claim 4, wherein a male thread is provided on the outer circumferential surface of the support portion, which is screwed into the female thread.

6. The valve body assembly according to claim 5, wherein when the valve body is furthest from the valve seat, the tip of the support portion is closer to the cover member than the female screw.

7. An electric valve having a valve body assembly and a stator unit, The valve body assembly comprises a cylindrical valve body having a valve chamber, a cylindrical magnet rotor disposed in the valve chamber, and a valve element disposed inside the magnet rotor. A first conduit is connected to the first end of the valve body, and a second conduit is connected to the second end of the valve body. The valve body includes a connecting passage that connects the valve chamber and the first pipeline, a valve opening that connects the valve chamber and the second pipeline, and a valve seat that surrounds the valve opening and is positioned inside the magnet rotor. The valve body moves closer to the valve seat when the magnet rotor rotates in the first direction, and moves away from the valve seat when it rotates in the second direction. The connecting channel, the valve seat, and the valve port are arranged coaxially with the magnet rotor. The stator unit has a stator that, together with the magnet rotor, constitutes a motor. The stator unit has an inner space extending from a first end face to a second end face of the stator unit, and an opening provided on the outer surface of the stator unit, extending from the first end face to the second end face and communicating with the inner space. An electric valve in which the valve body assembly is positioned in the inner space.

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