Electrically operated valve and electrically operated valve body

Abstract

An electric valve and an electric valve body that can improve the sealing performance of an axial flow electric valve in the closed state. The electric valve (1) includes: a valve body (10) having a cylindrical shape, with a first pipe (8) connected to one end in the axial direction and a second pipe (9) connected to the other end; a rotor (magnetic rotor (30)) disposed inside the valve body; a stator (60) disposed outside the valve body and forming an electric motor together with the rotor; a support member (12) disposed inside the valve body at one end and converting the rotation of the rotor into linear motion along the axial direction; a valve seat member (13) disposed inside the valve body at the other end and having a valve seat (17); a valve core (41) that moves linearly toward the valve seat along with the linear motion of the rotor; and a spring member (51) disposed between the rotor and the valve core, which is compressed along with the linear motion of the rotor in the closed state and presses the valve core toward the valve seat.

Description

Technical Field

[0001] This invention relates to an electric valve and an electric valve body. Background Technology

[0002] Conventionally, as shown in Patent Document 1, there are known cylindrical electric valves (so-called axial flow electric valves) assembled in series in a straight flow path. Axial flow electric valves are, for example, assembled in air conditioners and used to control the flow rate of fluids such as refrigerants.

[0003] In an axial-flow electric valve, the valve mainly consists of a cylindrical valve body and a stator unit arranged around the valve body. A magnetic rotor, for example, is disposed inside the valve body. The stator unit has a stator positioned outside the valve body where the magnetic rotor is located. The magnetic rotor and stator together constitute a stepper motor.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent document 1: Japanese Patent Application Publication No. 2007-127256.

[0007] The technical problem that the invention aims to solve

[0008] In electric valves, improved sealing performance in the closed state is required to suppress fluid leakage from the valve. Regarding this, Patent Document 1 describes a method that, during valve closure, applies a force stretched by a helical spring to the valve core facing the valve seat, mitigating the impact upon seat closure. However, Patent Document 1 does not specifically address the sealing performance in the closed state. Therefore, there is room for improvement in the technology for enhancing sealing performance in the closed state presented in Patent Document 1. Summary of the Invention

[0009] In view of the above, the present invention provides a technique that can improve the sealing performance of an axial flow electric valve in the closed state.

[0010] Technical means for solving technical problems

[0011] The electric valve according to the first method comprises: a valve body having a cylindrical shape, with a first pipe connected to one end in the axial direction and a second pipe connected to the other end; a rotor disposed inside the valve body; a stator disposed outside the valve body and forming an electric motor together with the rotor; a support member disposed inside the valve body on one side of the first end and converting the rotation of the rotor into linear motion along the axial direction; a valve seat member disposed inside the valve body on one side of the other end and having a valve seat; a valve core moving linearly toward the valve seat along with the linear motion of the rotor; and a spring member disposed between the rotor and the valve core, compressed in the closed state along with the linear motion of the rotor, pressing the valve core toward the valve seat.

[0012] In the electric valve described in the first embodiment, in the closed state, the spring component is compressed along with the linear motion of the rotor. The compressed spring component presses the valve core towards the valve seat. Therefore, the sealing performance of the axial-flow electric valve in the closed state can be improved.

[0013] In the second embodiment, the electric valve involved in the first embodiment has a connecting part that connects the rotor and the valve core. The end of the spring member on one side of the valve seat in the axial direction is mounted to the connecting part that connects the rotor and the valve core. The end of the spring member on the opposite side of the valve seat in the axial direction is mounted to the rotor.

[0014] In the second approach, an electric valve is capable of having the spring component configured to be clamped between the connecting part and the rotor.

[0015] In the third embodiment, the electric valve involved in the first embodiment has a connecting part that connects the rotor and the valve core. The end of the spring member on one side of the valve seat in the axial direction is mounted on one side of the valve core, and the end of the spring member on the opposite side of the valve seat in the axial direction is mounted on the connecting part.

[0016] In the third approach, an electric valve is capable of being configured such that the spring component is clamped between the valve core and the connecting part.

[0017] In the fourth approach, in any of the electric valves involved in the first to third approaches, the valve core is supported so as to be rotatable about an axis center.

[0018] In the fourth approach, in an axial-flow electric valve, the resistance experienced by the valve core from the fluid flowing on the inner side can be reduced.

[0019] The electric valve body according to the fifth method comprises: a valve body having a cylindrical shape, with a first pipe connected to one end in the axial direction and a second pipe connected to the other end; a rotor disposed inside the valve body; a support member disposed inside the valve body on one side of the first end, converting the rotation of the rotor into linear motion along the axial direction and supporting the rotor to move freely along the axial direction; a valve seat member disposed inside the valve body on one side of the other end and having a valve seat; a valve core that moves linearly toward the valve seat along with the linear motion of the rotor; and a spring member disposed between the rotor and the valve core, which is compressed along with the linear motion of the rotor in the closed state, pressing the valve core toward the valve seat.

[0020] In the fifth method, in the closed state, the spring component is compressed along with the linear motion of the rotor. The compressed spring component presses the valve core towards the valve seat. Therefore, it is possible to provide an electric valve body used with the stator that constitutes an axial-flow electric valve with improved sealing performance in the closed state.

[0021] The effects of the invention

[0022] According to the present invention, a technique is provided that can improve the sealing performance of an axial flow electric valve in the closed state. Attached Figure Description

[0023] Figure 1 This is a perspective view showing the open state of the electric valve body of the electric valve according to an embodiment of the present invention, partially cut along a plane including the axis.

[0024] Figure 2 This is a cross-sectional view showing the open state of the electric valve involved in this embodiment, cut along a plane including the axis.

[0025] Figure 3 This is a perspective view illustrating the valve core unit of the electric valve involved in this embodiment.

[0026] Figure 4 This is the left-side view of the valve core unit of the electric valve involved in this embodiment, where the valve core is located.

[0027] Figure 5 This is a cross-sectional view of the valve core unit of the electric valve involved in this embodiment, cut along a plane including the axis.

[0028] Figure 6 This is a perspective view showing a portion of the electric valve involved in this embodiment, cut along a plane including the axis.

[0029] Figure 7This is a cross-sectional view showing the closed state of the electric valve involved in this embodiment, cut along a plane including the axis.

[0030] Figure 8 This is a perspective view showing the open state of the electric valve body of the electric valve involved in the modified example of this embodiment, cut along a plane including the axis.

[0031] Figure 9 This is a cross-sectional view showing the open state of the electric valve involved in the modified example, cut along a plane including the axis.

[0032] Figure 10 This is a cross-sectional view showing the closed state of the electric valve involved in the modified example, cut along a plane including the axis.

[0033] Figure 11 This is a perspective view illustrating other examples of the valve core unit of the electric valve involved in the modified example.

[0034] Figure 12 This is a front view illustrating other examples of the valve core unit of the electric valve involved in the modified example.

[0035] Figure 13 This is a cross-sectional view of another example of the valve core unit of the electric valve involved in the modified example, cut by a plane including the axis.

[0036] Figure 14 This is a perspective view showing the open state of the electric valve body of the electric valve according to other embodiments of the present invention, cut along a plane including the axis.

[0037] Figure 15 This is a cross-sectional view showing the open state of the electric valve involved in other embodiments, cut along a plane including the axis.

[0038] Figure 16 This is a cross-sectional view showing the closed state of the electric valve involved in other embodiments, cut along a plane including the axis.

[0039] Symbol Explanation

[0040] 1, 1A, 1C… Electric valve; 5… Electric valve body; 6… Stator unit; 6C… Outer surface; 6D… Inner surface; 6S… Inner space; 8… First tube; 9… Second tube; 10… Valve body; 11… Housing; 12… Support component; 12A… Cover; 12B… Support; 12B1… External thread; 12C… Outer surface; 12D… Opening; 13… Valve seat component; 14… Cover; 14C… Outer surface; 15… Support; 16… Valve port; 17… Valve seat; 18… Valve chamber; 30… Magnetic rotor (rotor); 31… First part; 32… Second part; 32A… First cylindrical part; 32B… Second cylindrical part; 32C… Step; 33… Third part; 33A… Internal thread 33B…peripheral wall portion; 33C…groove portion; 35…inner space; 40, 40A, 40B, 40C…valve core unit; 41…valve core; 42…main body portion; 42A, 42A1…groove portion; 42B…flange portion; 43…valve portion; 44…base portion; 44A…flange portion; 44B…base portion; 45…first connecting portion; 45A…groove portion; 46…peripheral wall portion; 47A…cylindrical portion; 47A1…through hole; 47B…second connecting portion; 48…stopper; 48A…base portion; 48A1…protrusion; 48B…arm portion; 48B1…protrusion; 48C…cutout; 49…through hole; 51, 51A, 51B…spring component; 60…stator; F…refrigerant; L…axis. Detailed Implementation

[0041] The following describes this embodiment. In the accompanying drawings, the same or similar parts are labeled with the same or similar symbols. However, the drawings are schematic, and the relationship between thickness and planar dimensions, the ratio of thickness of each device or component, etc., may sometimes differ from reality. Therefore, specific thicknesses and dimensions should be determined with reference to the following description. Furthermore, there may be parts in the drawings that differ in their dimensional relationships or ratios. Additionally, unless otherwise specified in the specification, the number of constituent elements of the present invention is not limited to one, and multiple elements may exist.

[0042] Furthermore, in this specification, the terms "cylinder," "cylindrical," etc., are also used to describe parts or components that have the shape described by that term. For example, "cylindrical-shaped component" includes both cylindrical-shaped components and substantially cylindrical-shaped components. Additionally, in this specification, the term "same" includes both strictly identical and substantially identical cases.

[0043] <Structure of an electric valve>

[0044] The following is mainly based on Figures 1 to 7The electric valve 1 according to this embodiment will be described. The electric valve 1 according to this embodiment is used, for example, to control the flow rate of a fluid in an automotive air conditioner. The fluid is, for example, a high-pressure refrigerant F.

[0045] like Figure 1 and Figure 2 As shown, the electric valve 1 according to this embodiment includes a valve body 10, a magnetic rotor 30, a stator 60, a valve seat component 13, a support component 12, and a valve core unit 40. The electric valve 1 is, for example, assembled in series in a straight pipe of an air conditioner and is used to control the flow rate of refrigerant F. Figure 1 In the diagram, solid arrows represent refrigerant F flowing through the inner side of electric valve 1. The electric valve 1 in this embodiment consists of an electric valve body 5 and a stator unit 6.

[0046] (Valve body)

[0047] The valve body 10 has a cylindrical shape. For example... Figure 2 As shown, one end of the valve body 10 in the axial direction ( Figure 2 The right end of the middle is connected to the first tube 8, and at the other end ( Figure 2 The left end of the middle section is connected to a second tube 9. The axial direction is... Figure 2 The valve body 10 extends in the left and right directions along the central axis L. It includes a housing 11, a support component 12, and a valve seat component 13. The housing 11, support component 12, and valve seat component 13 are made of metals such as stainless steel or aluminum alloy.

[0048] The housing 11, support member 12, and valve seat member 13 form a valve chamber 18. A first pipe 8 is joined to the outer surface 12C (i.e., end face) of the support member 12. The first pipe 8 is connected to the valve chamber 18 through the flow path of the support member 12. A second pipe 9 is joined to the outer surface 14C (i.e., end face) of the cover 14. The second pipe 9 is connected to the valve chamber 18 through a valve port 16. The first pipe 8 and the second pipe 9 are pipes that form the flow path of the air conditioner.

[0049] (case)

[0050] like Figure 1 and Figure 2 As shown, the housing 11 has a cylindrical shape. The housing 11 is arranged along the axis L.

[0051] (Supporting components)

[0052] like Figure 1 and Figure 2 As shown, the support member 12 is generally cylindrical. The support member 12 is disposed on one axial end side inside the valve body 10. Figure 2 (Right side of the middle). The support member 12 integrally has a cover portion 12A and a support portion 12B.

[0053] The cover 12A has a circular plate shape or a cylindrical shape. The cover 12A and the housing 11... Figure 2 One end of the middle section is coaxially joined. Cover 12A is closed. Figure 2 One end of the right side of the shell 11.

[0054] The support portion 12B has a cylindrical shape. The support portion 12B extends from the cover portion 12A toward the valve core unit 40. The support portion 12B is disposed inside the housing 11. An external thread 12B1 is formed on the outer peripheral surface of the support member 12.

[0055] like Figure 2 As shown, the support member 12 converts the rotation of the magnetic rotor 30 into linear motion along the axial direction by engaging the external thread 12B1 of the outer peripheral surface of the support member 12 with the internal thread 33A of the third part 33 of the magnetic rotor 30. The support member 12 supports the magnetic rotor 30 so that it can move freely along the axial direction. A threaded feed mechanism is formed between the support member 12 and the magnetic rotor 30.

[0056] A refrigerant F flow path is formed on the inner side of the support member 12. The formed flow path passes through the cover portion 12A and the support portion 12B. The opening 12D of the flow path on the inner side of the support member 12, which is opposite to the first pipe 8, is located on the inner side of the spring member 51 and faces the valve core unit 40. The opening 12D is located at the top end of the support portion 12B. Figure 2 The left end of the middle). Opening 12D and one end side ( Figure 2 The first tube 8 (on the right side of the middle) is connected. The cover 12A, the support 12B and the opening 12D are arranged coaxially with each other.

[0057] (Valve seat assembly)

[0058] like Figure 1 and Figure 2 As shown, the valve seat component 13 is generally cylindrical. The valve seat component 13 is disposed on the inner side of the valve body 10 at the other end in the axial direction. Figure 2 (Left side of the middle). The valve seat component 13 integrally has a cover portion 14 and a support portion 15.

[0059] Valve seat component 13 has a valve port 16 and a valve seat 17. The valve port 16, serving as a flow path for refrigerant F, passes through the cover portion 14 and the support portion 15. The valve seat 17 is located at the top of the support portion 15. Figure 2 (Right end of the valve). Valve seat 17 is connected to the second pipe 9 on the other end. Valve seat 17 surrounds valve port 16. Cover 14, support 15, valve port 16 and valve seat 17 are arranged coaxially.

[0060] The cover 14 has a circular or cylindrical shape. The cover 14 is coaxially engaged with the other end of the housing 11. The cover 14 is closed. Figure 2 The other end of the left side of the casing 11.

[0061] The support portion 15 has a cylindrical shape. The support portion 15 extends from the cover portion 14 toward the support member 12. The support portion 15 is disposed inside the housing 11.

[0062] (Magnetic rotor)

[0063] In this embodiment, the magnetic rotor 30 is disposed on one end side inside the valve body 10. Figure 2 (Right side of the diagram). The magnetic rotor 30 corresponds to the rotor of the present invention. In the present invention, the rotor is not necessarily disposed on one end side inside the valve body 10. For example, the rotor may also be disposed on the inside of the valve body 10 away from one end, such as at the central position in the axial direction.

[0064] The magnetic rotor 30 has a cylindrical shape. The magnetic rotor 30 is coaxially disposed in the valve chamber 18 along axis L. The magnetic rotor 30 is rotatable relative to the valve body 10 about its axis center. The magnetic rotor 30 has a first portion 31, a second portion 32, and a third portion 33 radially from the inside to the outside. The first portion 31, the second portion 32, and the third portion 33 are integrally fixed.

[0065] The first part 31 has a cylindrical shape. The first part 31 is, for example, a ferrite material. The first part 31 has multiple magnetic poles (at least multiple N poles and multiple S poles). The multiple N poles and multiple S poles are arranged alternately at equal angular intervals in the circumferential direction. The multiple N poles and multiple S poles extend in a direction along the axis L. The first part 31 has, for example, 12 N poles and 12 S poles. The angle between two adjacent magnetic poles about the axis L is 15 degrees.

[0066] The second part 32 has a cylindrical shape and is coaxially disposed inside the first part 31. The second part 32 is made of, for example, synthetic resin and is integrally formed with the first part 31. A step 32C is formed on the inner circumferential surface of the second part 32. The second part 32 has a portion located across the step 32C. Figure 2 The first cylindrical portion 32A on the left and located in Figure 2 The second cylindrical portion 32B on the right side of the middle section.

[0067] In this embodiment, the outer diameter of the first cylindrical portion 32A is the same as that of the second cylindrical portion 32B. However, the inner diameter of the first cylindrical portion 32A is smaller than that of the second cylindrical portion 32B. A [structure / form] is formed between the inner circumferential surface of the first cylindrical portion 32A and the inner circumferential surface of the second cylindrical portion 32B. Figure 2 The bottom surface of the vertical step 32C is in contact with the bottom surface of the valve core unit 40.

[0068] The third part 33 has a cylindrical shape. The third part 33 is coaxially disposed inside the second part 32, along with the first part 31 and the second part 32. The third part 33 is, for example, made of synthetic resin. The outer peripheral surface of the third part 33 contacts the inner peripheral surface of the second cylindrical portion 32B of the second part 32. The third part 33 is axially spaced from the first cylindrical portion 32A of the second part 32. An internal thread 33A is formed on the inner peripheral surface of the third part 33. The internal thread 33A engages with an external thread 12B1 formed on the outer peripheral surface of the support member 12.

[0069] exist Figure 2 The third part 33 has a peripheral wall portion 33B extending towards the left side of its axial left end face. The outer peripheral surface of the peripheral wall portion 33B is located inside the outer peripheral surface of the third part 33 and the inner peripheral surface of the second part 32. Therefore, a groove portion 33C is formed between the outer peripheral surface of the peripheral wall portion 33B and the inner peripheral surface of the second part 32. One end of the spring member 51 is mounted in the groove portion 33C. The groove portion 33C functions as a spring support portion.

[0070] An inner space 35 for the magnetic rotor 30 is formed inside the third part 33. The inner space 35 is a flow path that communicates with the first tube 8, the interior of the support member 12, the through hole 49 of the valve core unit 40, the valve port 16, and the second tube 9.

[0071] (Stator unit)

[0072] Stator unit 6 is configured along axis L. Stator unit 6 is mounted on electric valve body 5. Stator unit 6 has a stator 60 and a cover (not shown).

[0073] (stator)

[0074] The stator 60 is disposed radially outside the valve body 10. In this embodiment, the stator 60, together with the magnetic rotor 30, constitutes a stepper motor. The rotor and stator of the present invention can also constitute a motor other than a stepper motor. The stator 60 has a stator core (not shown) and a plurality of coils (not shown).

[0075] The stator core is formed, for example, by stacking multiple thin electromagnetic steel plates. The stator core has a back magnetic yoke (not shown), multiple main magnetic poles (not shown), and multiple auxiliary magnetic poles (not shown).

[0076] The back yoke has a generally cylindrical shape and a C-shape (i.e., an arc shape) when viewed along the axis L. Multiple main magnetic poles and multiple auxiliary magnetic poles protrude from the inner surface of the back yoke toward the axis L. Multiple coils are wound around the multiple main magnetic poles.

[0077] Although the illustration is omitted, the cover has a shape that follows the outline of the stator 60 and covers the stator 60. When viewed from the direction along the axis L, the cover has a C-shape (i.e., an arc shape). The cover is made of synthetic resin and is integrally formed with the stator 60. The inner surface of the cover, together with the tips of the main magnetic poles and the tips of the auxiliary magnetic poles, forms the inner surface 6D of the stator unit 6. In this invention, the cover may also be omitted from the stator unit 6.

[0078] like Figure 2 As shown, the stator unit 6 has an inner space 6S and an opening (not shown) for inserting a first tube 8 or a second tube 9 into the inner space 6S. The inner space 6S extends axially from one end face to the other. The opening is located on the outer surface 6C of the stator unit 6, extending from one end face to the other, and communicates with the inner space 6S. The inner space 6S is divided 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 electric valve body 5. The electric valve body 5 is disposed in the inner space 6S. The width of the opening is larger than the outer diameter of both the first tube 8 and the second tube 9.

[0079] In this embodiment, the central axes of the electric valve body 5, stator unit 6, first tube 8, and second tube 9 are aligned with the direction along axis L. The electric valve body 5 is composed of valve body 10, magnetic rotor 30, and valve core unit 40. The stator unit 6 is composed of inner space 6S, stator 60, and cover.

[0080] When the stator unit 6 is installed on the electric valve body 5, firstly, the electric valve body 5 is connected to the first pipe 8 and the second pipe 9. Furthermore, with the opening of the stator unit 6 facing the first pipe 8, the stator unit 6 moves toward the first pipe 8.

[0081] The first tube 8 is inserted into the inner space 6S through the opening of the stator unit 6. The first tube 8 is coaxially arranged with the inner space 6S of the stator unit 6. By moving the stator unit 6 in the direction along the axis L, the electric valve body 5 can be inserted into the inner space 6S of the stator unit 6. Furthermore, the stator unit 6 can be mounted on the electric valve body 5 using a mounting mechanism (not shown).

[0082] (Valve core unit)

[0083] The valve core unit 40 is coaxially disposed within the inner space 35 of the magnetic rotor 30 along axis L. The valve core unit 40 includes a first connecting part 45, a spring component 51, a cylinder part 47A, a second connecting part 47B, and a valve core 41.

[0084] (First connecting section)

[0085] like Figure 3 and Figure 4As shown, the first connecting portion 45 is annular. In this invention, the shape of the connecting portion can be appropriately changed. The first connecting portion 45 corresponds to the connecting portion of this invention. The connecting portion of this invention can also be composed of the first connecting portion 45, the cylindrical portion 47A, and the second connecting portion 47B.

[0086] The first connecting portion 45 can be made of, for example, metal, resin, or the like. A peripheral wall portion 46 extending toward the support member 12 is provided on the surface of the first connecting portion 45. The outer peripheral surface of the peripheral wall portion 46 is located inside the outer peripheral surface of the third portion 33 and the inner peripheral surface of the second portion 32. Therefore, a groove 45A is formed between the outer peripheral surface of the peripheral wall portion 46 and the inner peripheral surface of the second portion 32.

[0087] The other end of the spring member 51 is mounted on the groove 45A. The groove 45A functions as a spring support. Therefore, the spring member 51 is connected to the first connecting part 45. Thus, the valve core unit 40 having the first connecting part 45 of this embodiment is connected to the magnetic rotor 30 via the spring member 51.

[0088] The surface of the valve seat 17 side of the first connecting part 45 contacts the bottom surface of the step 32C of the second part 32 of the magnetic rotor 30. The first connecting part 45 is not fixed to the magnetic rotor 30. Figure 2 In the open valve state, the first connecting part 45 is pressed by the spring member 51 against the bottom surface of the step 32C of the second part 32 of the magnetic rotor 30.

[0089] (Spring component)

[0090] like Figure 2 As shown, the spring component 51 in this embodiment is a helical spring. The spring component 51 deforms elastically. In this embodiment, the spring component 51 is clamped between the first connecting portion 45 and the magnetic rotor 30. In this invention, the position of the spring component 51 is not limited to between the first connecting portion 45 and the magnetic rotor 30, and can be appropriately changed.

[0091] A spring member 51 is disposed between the magnetic rotor 30 and the valve core 41. Specifically, in this embodiment, the spring member 51 is axially disposed between the magnetic rotor 30 and the valve portion 43 of the valve core 41. After the valve portion 43 of the valve core 41 is seated on the valve seat 17, the spring member 51 is compressed as the magnetic rotor 30 moves linearly toward the second tube 9. The compressed spring member 51 presses the valve core unit 40 toward the valve seat 17.

[0092] (Cylinder section, second connecting section)

[0093] The valve core unit 40 of this embodiment has a cylindrical portion 47A disposed inside the first connecting portion 45. The cylindrical portion 47A is connected to the first connecting portion 45 by four rod-shaped or plate-shaped second connecting portions 47B. In this invention, the shape of the second connecting portions is arbitrary. Four through holes 49, which function as flow paths, are formed between adjacent second connecting portions 47B. The first connecting portion 45 of this embodiment, which forms the frame of the flow path, functions as a flow straightener. In this invention, the number of second connecting portions and the number of through holes can be arbitrarily set.

[0094] The valve core 41 is supported by the first connecting portion 45. Specifically, in this embodiment, the diameter of the main body portion 42 of the valve core 41 is slightly smaller than the diameter of the through hole 47A1 inside the cylindrical portion 47A. The main body portion 42 is rotatably inserted into the through hole 47A1. Therefore, the valve core 41 is supported by the first connecting portion 45 so that it can rotate about its axial center. In this invention, it is not necessary for the valve core 41 to be supported by the first connecting portion 45 so that it can rotate about its axial center.

[0095] (valve core)

[0096] like Figure 5 As shown, the valve core 41 is disposed inside the through hole 47A1 of the cylindrical portion 47A. The valve core 41 is generally cylindrical. The valve core 41 integrally comprises a main body portion 42, a valve portion 43, and a base portion 44. The valve core 41 is located in... Figure 5 The base 44 at the right end of the valve portion 41 extends axially between the valve portion 43 at the left end. The valve core 41 is made of a metal such as stainless steel or brass. The top end of the valve portion 43 on the valve seat 17 side has a tapered shape. The top end of the valve portion 43 is opposite to the valve port 16 and the valve seat 17.

[0097] The main body 42, valve 43, base 44, and first connecting part 45 are arranged coaxially with each other. In this embodiment, the area of ​​the valve core unit 40, except for a portion of the top end of the valve 43, is located inside the magnetic rotor 30, but this is not a limitation in the present invention, and the arrangement position of the valve core unit 40 can be appropriately changed.

[0098] When the electric valve 1 is closed, the valve core 41 is pressed toward the valve seat 17 via the first connecting part 45, the second connecting part 47B and the cylindrical part 47A by the spring member 51 compressed by the linear motion of the magnetic rotor 30.

[0099] like Figure 5 As shown, a flange portion 44A, with an increased diameter compared to the main body portion 42, is formed on the outer peripheral surface of the main body portion 42 in a region closer to the base portion 44 than the first connecting portion 45. The flange portion 44A prevents the valve core 41 from detaching from the through hole 47A1 towards the magnetic rotor 30. In this invention, the flange portion is not essential.

[0100] (Stop component)

[0101] like Figure 4 As shown, the stop 48 is a C-shaped plate-like component. The stop 48 has a base 48A and a... Figure 4 A pair of arms 48B are symmetrically arranged on either side of a base 48A. One end of each arm 48B on the base 48A side is mounted to the base 48A. The stop 48 in this embodiment is made of an elastic material. The base 48A and the pair of arms 48B are formed as a single unit.

[0102] The ends of each arm 48B, opposite to the base 48A, are spaced apart and face each other. A cutout 48C is formed between the ends of the opposing arm 48B. (As shown) Figure 4 As shown, the base 48A, one arm 48B of a pair of arms 48B, the cut 48C, and the other arm 48B of a pair of arms 48B are arranged circumferentially in sequence.

[0103] like Figure 4 As shown, the base 48A has a protrusion 48A1 that protrudes toward the central axis L. Each of the pair of arm portions 48B has a protrusion 48B1 that protrudes toward the central axis L. A groove 42A is formed on the outer peripheral surface of the main body 42 in a region closer to the valve portion 43 than the first connecting portion 45.

[0104] The protrusion 48A1 of the base 48A and the protrusion 48B1 of each of the pair of arms 48B engage with the groove 42A. Using the notch 48C, the stop 48 can be inserted into the groove 42A of the valve core 41. The stop 48 prevents the valve core 41 from falling out of the through hole 47A1 toward the magnetic rotor 30. In this invention, the flange 44A and the stop 48 are not essential.

[0105] <Action of the electric valve>

[0106] like Figure 6 As shown, when the valve is closed, as the magnetic rotor 30 moves linearly toward the valve seat 17, the spring member 51 connected to the magnetic rotor 30 is compressed by the magnetic rotor 30. Pressed by the compressed spring member 51, the valve core unit 40 moves toward the valve seat 17. When the valve portion 43 of the valve core 41 of the valve core unit 40 sits on the valve seat 17, the first connecting portion 45, integrated with the main body portion 42, stops. The valve is closed.

[0107] like Figure 7 As shown, after the valve is closed, by rotating the magnetic rotor 30 by a predetermined angle and moving it linearly toward the second tube 9, the force that presses the valve core 41 against the valve seat 17 via the spring member 51 can be increased. That is, a so-called tightening can be performed.

[0108] In this embodiment, when the magnetic rotor 30 moves further linearly toward the second tube 9 by fastening, in the valve core unit 40 where the valve part 43 contacts the valve seat 17 but is not fixed to the second part 32 of the magnetic rotor 30, the first connecting part 45 separates from the bottom surface of the step 32C of the second part 32 of the magnetic rotor 30. Then, the compressed spring member 51 presses the valve core 41 against the valve seat 17 via the first connecting part 45. In this embodiment, the pressing force of the magnetic rotor 30 is transmitted to the valve core 41 via the spring member 51 and the first connecting part 45.

[0109] On the other hand, when the valve is opened, the spring member 51, which is connected to the magnetic rotor 30 moving linearly away from the valve seat 17, stretches the first connecting portion 45 connected to the spring member 51 toward the first tube 8. Through the movement of the first connecting portion 45, the valve core 41 connected to the first connecting portion 45 moves away from the valve seat 17. As a result, the valve is opened.

[0110] (Effects of this implementation method)

[0111] In the electric valve 1 according to this embodiment, in the closed state, the spring member 51 is compressed along with the linear motion of the magnetic rotor 30. The compressed spring member 51 presses the valve core 41 towards the valve seat 17. Therefore, the sealing performance of the axial flow electric valve 1 in the closed state can be improved. Furthermore, according to this embodiment, an electric valve body 5, used with the stator 60, constituting an axial flow electric valve 1 with improved sealing performance in the closed state, can be provided.

[0112] Furthermore, in this embodiment, the axial end of the spring member 51 on one side of the valve seat 17 is mounted to the first connecting portion 45. Additionally, the axial end of the spring member 51 opposite to the valve seat 17 is mounted to the magnetic rotor 30. Therefore, an electric valve can be implemented in which the spring member 51 is configured to be clamped between the first connecting portion 45 and the magnetic rotor 30.

[0113] Furthermore, in this embodiment, the valve core 41 is supported so that it can rotate about its axis. Therefore, in the axial flow electric valve 1, the resistance experienced by the valve core 41 from the fluid flowing inside can be reduced.

[0114] Furthermore, in this embodiment, the valve core 41 is supported by a first connecting portion 45 of a rigid body such as metal or resin. In this respect, for example, if the valve core is supported by an elastic member, the length of the valve connecting portion along the axial direction tends to increase because the elastic member deforms axially. In this embodiment, since the valve core 41 is supported by the first connecting portion 45 of a rigid body, the length of the valve connecting portion along the axial direction tends to decrease.

[0115] Furthermore, since the adjacent second connecting portions 47B are spaced apart, a through hole 49 for refrigerant F to flow is formed between the first connecting portion 45 and the valve core 41 as a flow path. Therefore, the valve core unit 40 does not obstruct the flow of refrigerant F.

[0116] (Modified Example)

[0117] Next, refer to Figures 8-10 The electric valve 1A according to the modified example will be described. In the electric valve 1A according to the modified example, the spring member 51A is disposed on the outer peripheral surface of the main body 42, which is different from the present embodiment.

[0118] Specifically, such as Figure 9 As shown, in the main body 42 of the valve core 41, a flange 42B, which is larger in diameter than the main body 42, is formed on the outer peripheral surface of the valve core 41 on the side closer to the valve seat 17 than the first connecting portion 45, serving as a spring support portion. The spring member 51A is configured to be wound around the main body 42 between the flange 42B of the valve core 41 and the cylindrical portion 47A of the first connecting portion 45. Therefore, the axial end of the spring member 51A on the valve seat 17 side is mounted to the flange 42B. In addition, the axial end of the spring member 51A opposite to the valve seat 17 side is mounted to the cylindrical portion 47A of the first connecting portion 45.

[0119] Spring component 51A is positioned between magnetic rotor 30 and valve core 41. For example... Figure 9 As shown, specifically, in the modified example, the spring component 51A is axially disposed between the magnetic rotor 30 and the valve portion 43 of the valve core 41.

[0120] Furthermore, in the modified electric valve 1A, the valve core 41 is able to slide axially, which differs from the present embodiment. Also, in the modified electric valve 1A, the base 44B of the main body 42 has an enlarged diameter, which differs from the present embodiment.

[0121] Specifically, such as Figure 9 As shown, in the modified example, the flange portion 44A and the stop member 48, which are respectively arranged with respect to the first connecting portion 45, are not provided in this embodiment. Therefore, in the modified example, the main body portion 42 of the valve core 41 and the first connecting portion 45 are configured to slide against each other. In addition, the base portion 44B of the modified example has a larger diameter than the main body portion 42 of the valve core 41. The base portion 44B prevents the valve core 41 from falling off from the through hole 47A1 toward the magnetic rotor 30.

[0122] Furthermore, the valve core unit 40A is fixed to the magnetic rotor 30 in the modified electric valve 1A, which differs from this embodiment. Specifically, as Figure 9As shown, the right end face of the first connecting portion 45 is in contact with the left end face of the third portion 33. The left end face of the first connecting portion 45 is in contact with the right end face of the first cylindrical portion 32A of the second portion 32.

[0123] The first connecting part 45 is directly fixed to the magnetic rotor 30 by clamping it between the third part 33 and the second part 32. Therefore, the relative position of the valve core 41 and the magnetic rotor 30 does not change in the open and closed states.

[0124] Furthermore, the outer diameter of the first cylindrical portion 32A of the second portion 32 is smaller than the outer diameter of the second cylindrical portion 32B. Additionally, the outer diameter of the first cylindrical portion 32A is smaller than the inner diameter of the first portion 31. Therefore, a gap is formed between the first portion 31 and the second portion 32 at the location of the first cylindrical portion 32A. The other structures of the electric valve 1A involved in the modified example are the same as those of the electric valve 1 of this embodiment, and therefore, repeated descriptions are omitted.

[0125] <Action of the electric valve>

[0126] like Figure 10 As shown, when the valve is closed, as the magnetic rotor 30 moves linearly toward the valve seat 17, the valve core unit 40, which is integrated with the magnetic rotor 30, moves toward the valve seat 17. When the valve portion 43 of the valve core 41 of the valve core unit 40 sits on the valve seat 17, the valve is closed. The spring member 51 connected to the magnetic rotor 30 is compressed by the magnetic rotor 30. Pressed by the compressed spring member 51, the first connecting portion 45, which is integrated with the main body portion 42, stops.

[0127] In a modified example, after the valve section 43 is seated, when the magnetic rotor 30 is further moved linearly toward the second tube 9 by tightening, the magnetic rotor 30, which is integrated with the valve seat 17 and the first connecting part 45 that can slide relative to the main body 42, moves linearly toward the second tube 9. The magnetic rotor 30 moves linearly against the force borne by the compressed spring member 51.

[0128] Through the linear motion of the magnetic rotor 30, the compressed spring member 51 presses the valve core 41 against the valve seat 17 via the flange portion 42B. In a modified example, the pressing force of the magnetic rotor 30 is transmitted to the valve core 41 via the first connecting portion 45, the spring member 51, and the flange portion 42B.

[0129] On the other hand, when the valve is opened, the first connecting portion 45, which is connected to the magnetic rotor 30 moving linearly away from the valve seat 17, comes into contact with the base 44B. As the first connecting portion 45 continues to move linearly away from the valve seat 17 while in contact with the base 44B, the valve core 41 connected to the first connecting portion 45 also moves away from the valve seat 17. As a result, the valve is opened.

[0130] (Effects of the modified examples)

[0131] In the modified electric valve 1A, similar to the present embodiment, in the closed state, the spring member 51A is compressed along with the linear motion of the magnetic rotor 30. The compressed spring member 51A presses the valve core 41 towards the valve seat 17. Therefore, the sealing performance of the axial flow electric valve in the closed state can be improved.

[0132] Furthermore, in a modified example, the axial end of the spring member 51A of the valve core unit 40A, on one side of the valve seat 17, is mounted to one side of the valve core 41. Additionally, the axial end of the spring member 51A opposite to the valve seat 17 is mounted to the first connecting portion 45. Therefore, an electric valve can be implemented in a configuration where the spring member 51A is clamped between the valve core 41 and the first connecting portion 45. Other effects of the electric valve 1A in the modified example are the same as those of the electric valve 1 in this embodiment, and therefore, repeated descriptions are omitted.

[0133] (Other examples of valve core units)

[0134] In a modified example, the limit position of the sliding range of the valve core 41 on the first tube 8 side is set by the base 44B. However, in this invention, the limit position of the sliding range of the valve core 41 on the first tube 8 side can also be set by other structures. For example, such as Figure 11 and Figure 12 As shown, the valve core unit 40B in other examples has a first connecting portion 45, a cylindrical portion 47A, a valve core 41, a stop member 48, and a spring member 51A. The stop member 48 of the valve core unit 40B in other examples has the same structure as the stop member 48 in this embodiment.

[0135] like Figure 13 As shown, a groove 42A1 is formed on the outer peripheral surface of the main body portion 42 of the valve core 41 on the side of the base 44. In other examples, the groove 42A1 extends along... Figure 5 The width measured in the left and right directions is set to be greater than the thickness of the stop 48 plate. The protrusion of the base of the stop 48 (not shown) and the protrusions of each of the pair of arms 48B fit into the groove 42A1.

[0136] In the electric valve using the valve core unit 40B described in other examples, the limit position of the sliding range of the valve core 41 on the first pipe 8 side can be set by the groove 42A1 and the stop member 48. Other effects of the electric valve using the valve core unit 40B described in other examples are the same as those of the electric valve 1 described in this embodiment and the electric valve 1A described in the modified example, so repeated descriptions are omitted.

[0137] (Other implementation methods)

[0138] Next, refer to Figures 14-16 The electric valve 1C according to other embodiments of the present invention will be described. For example... Figure 14 and Figure 15 As shown, the electric valve 1C in other embodiments includes a valve body 10, a magnetic rotor 30, a stator 60, a support member 12, a valve seat member 13, a valve core unit 40C, and a spring member 51B. The valve core unit 40C has a first connecting portion 45 connected to the magnetic rotor 30 and a valve core 41 supported on the first connecting portion 45.

[0139] The spring component 51B is connected to the magnetic rotor 30 and is compressed along with the linear motion of the magnetic rotor 30. When the valve is closed, the valve core 41 is pressed toward the opposite side of the valve seat 17 by the compressed spring component 51B.

[0140] Specifically, in the valve core unit 40C of the electric valve 1C in other embodiments, the valve core 41, the first connecting portion 45, the cylindrical portion 47A, and the second connecting portion 47B are integrally formed. That is, the valve core 41 does not slide axially relative to the first connecting portion 45 and does not rotate about the axis center. The valve core unit 40C, like the valve core unit 40A in the modified example, is clamped between the second portion 32 and the third portion 33 of the magnetic rotor 30.

[0141] In other embodiments, the spring member 51B is disposed within the valve chamber 18 in a state of being clamped between the valve seat member 13 and the magnetic rotor 30. Figure 15 The left end of the second tube 9 on one side of the spring component 51B of the valve core unit 40C in the middle contacts the right end face of the cover portion 14. Additionally, Figure 15 The right end of one side of the first tube 8 of the spring component 51B is inserted into the inside of the gap formed between the first part 31 and the second part 32 of the magnetic rotor 30.

[0142] In this invention, the gap formed between the first portion 31 and the second portion 32 is not necessary. For example, it can also be... Figure 15 The spring member 51B is configured such that its right end contacts the end face of the valve chamber 18 side of any one of the first part 31, the second part 32, and the third part 33 of the magnetic rotor 30. Other structures of the electric valve 1C in other embodiments are the same as those of the electric valve 1 in this embodiment and the electric valve 1A in its variations, therefore, repeated descriptions are omitted.

[0143] <Action of the electric valve>

[0144] like Figure 16As shown, when the valve is closed, as the magnetic rotor 30 moves linearly toward the valve seat 17, the valve core unit 40, which is integrated with the magnetic rotor 30, moves toward the valve seat 17. The spring member 51 connected to the magnetic rotor 30 is compressed by the magnetic rotor 30. The magnetic rotor 30 moves linearly toward the valve seat 17 while overcoming the pressing force from the compressed spring member 51B. When the valve portion 43 of the valve core 41 of the valve core unit 40 sits on the valve seat 17, the valve is closed.

[0145] That is, the spring component 51B can mitigate the impact when the valve core 41 is pressed against the valve seat 17. Therefore, even after the valve core 41 begins to open after the valve closing action, it can maintain its attachment to the valve seat 17, thereby suppressing the occurrence of a state where it is difficult to immediately leave the valve seat 17 (the so-called valve engagement state). As a result, the stability of the electric valve 1C's actuation can be improved.

[0146] On the other hand, when the valve is opened, the first connecting portion 45, which is connected to the magnetic rotor 30 moving linearly away from the valve seat 17, moves linearly away from the valve seat 17, thereby causing the valve core 41 connected to the first connecting portion 45 to also leave the valve seat 17. Furthermore, when the valve core 41 leaves the valve seat 17, a force is applied to the magnetic rotor 30 in the direction of leaving the valve seat 17 by the compressed spring member 51. Other effects of the electric valve 1C in other embodiments are the same as those of the electric valve 1 in this embodiment and the electric valve 1A in the modified examples, therefore, repeated descriptions are omitted.

[0147] Although the invention has been described through the disclosed embodiments above, it should not be construed that the discussion and drawings, which form part of this disclosure, limit the invention. For example, the invention may also be configured by partially combining the structures illustrated in the accompanying drawings. The invention includes various embodiments not described above, and the technical scope of the invention is determined only by the inventive specific matters within the scope of the appropriate patent claims described above.

Claims

1. An electrically operated valve characterised in that, have: The valve body has a cylindrical shape, with a first pipe connected to one end in the axial direction and a second pipe connected to the other end; A rotor, which is disposed inside the valve body; The stator is disposed on the outside of the valve body and together with the rotor constitutes an electric motor; A support member is disposed on one side of one end inside the valve body and converts the rotation of the rotor into linear motion along the axial direction. A valve seat component, which is disposed on one side of the other end inside the valve body, and has a valve seat; A valve core that moves linearly toward the valve seat in tandem with the linear motion of the rotor; and A spring component, disposed between the rotor and the valve core, is compressed in the closed state along with the linear motion of the rotor, pressing the valve core toward the valve seat.

2. The electric valve according to claim 1, characterized in that, It includes a connecting part that connects the rotor and the valve core. The end of the valve seat on one side in the axial direction of the spring component is mounted to the connecting portion. The axial end of the spring component, opposite to the valve seat, is mounted on the rotor.

3. The electric valve according to claim 1, characterized in that, It includes a connecting part that connects the rotor and the valve core. One end of the valve seat on one side of the spring component in the axial direction is mounted on one side of the valve core. The axial end of the spring component opposite to the valve seat is mounted on the connecting portion.

4. The electric valve according to any one of claims 1 to 3, characterized in that, The valve core is supported so that it can rotate about the center of its axis.

5. An electrically powered valve body characterized by, have: The valve body has a cylindrical shape, with a first pipe connected to one end in the axial direction and a second pipe connected to the other end; A rotor, which is disposed inside the valve body; A support component, disposed on one side of one end inside the valve body, converts the rotation of the rotor into linear motion along the axial direction and supports the rotor so that it can move freely forward and backward along the axial direction; A valve seat component, which is disposed on one side of the other end inside the valve body, and has a valve seat; A valve core that moves linearly toward the valve seat in tandem with the linear motion of the rotor; and A spring component, disposed between the rotor and the valve core, is compressed in the closed state along with the linear motion of the rotor, pressing the valve core toward the valve seat.

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