Electronic expansion valve

Abstract

The application provides an electronic expansion valve, which comprises a rotor component, a screw rod and a stop rod. The rotor component comprises a rotor base, the screw rod is connected with the rotor base, and the stop rod is located below the rotor base in the axial direction of the electronic expansion valve and comprises a base and a rod part. The rod part is arranged in extension in the axial direction of the electronic expansion valve, the base is provided with a through hole, and the screw rod is arranged in the hole. The screw rod comprises a first abutting part, the rotor base comprises a second abutting part, and the base directly or indirectly abuts between the first abutting part and the second abutting part. The rotor component comprises a rotation-stopping part, the base is provided with a clamping part, the clamping part at least partially contacts the rotation-stopping part when the rotor component is actuated, and the clamping part follows the rotation of the rotation-stopping part.

Description

Technical Field

[0001] This application relates to the field of refrigeration control technology, and in particular to electronic expansion valves. Background Technology

[0002] Electronic expansion valves, as an important component, are commonly used in refrigeration systems to regulate the flow rate of refrigerant. An electronic expansion valve includes a rotor assembly and a stop rod. The rotor assembly includes a rotor and a rotor seat, with a through hole in the rotor seat. The horizontal portion of the stop rod is fixedly connected to the upper end of the rotor seat, and the axial portion of the stop rod extends downward through the through hole. The stop rod rotates synchronously with the rotor assembly and actuates the sliding element of the electronic expansion valve to rotate along the guide rail, thus forming a stop-position relationship. For those skilled in the art, optimizing the structure of the electronic expansion valve to make the stop rod structure relatively simple and easy to connect is a pressing technical problem that needs to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide an electronic expansion valve that makes the structure of the stop valve relatively simple and easy to connect.

[0004] The present invention provides an electronic expansion valve, comprising a rotor assembly, a lead screw, and a stop rod. The rotor assembly includes a rotor seat, and the lead screw is fixedly connected to the rotor seat along the axial direction of the electronic expansion valve. At least a portion of the stop rod is located below the rotor seat. The stop rod is an integrally formed steel wire structure, comprising a body portion and a rod portion, and the rod portion extends from the body portion along the axial direction of the electronic expansion valve.

[0005] The main body includes a base that directly or indirectly abuts against the rotor seat and the lead screw. The main body also includes a stop portion that is located on a different side of the base from the rod portion. The rotor component is provided with a limiting portion. When the rotor component is actuated, the stop portion contacts the limiting portion, and the stop rod follows the rotation of the rotor component.

[0006] This application optimizes the structure of the electronic expansion valve so that the stop rod is located below the rotor seat. The stop rod includes a body part and a rod part. The body part includes a base part, which directly or indirectly abuts against the rotor seat and the stop rod. The body part includes a stop part, and the rotor component includes a limiting part. When the rotor component is actuated, the stop part contacts the limiting part, and the stop rod rotates with the rotor component. The overall structure of the stop rod is relatively simple and easy to connect. Attached Figure Description

[0007] Figure 1 A cross-sectional schematic diagram of the overall structure of the electronic expansion valve according to the first embodiment provided in this application;

[0008] Figure 2 for Figure 1A three-dimensional schematic diagram of the mating structure of some lead screw and nut components;

[0009] Figure 3 for Figure 1 A three-dimensional schematic diagram of the stop bar;

[0010] Figure 4 for Figure 1 A three-dimensional structural diagram of the rotor component;

[0011] Figure 5 A three-dimensional structural schematic diagram of the stop rod of the electronic expansion valve according to the second embodiment provided in this application;

[0012] Figure 6 A three-dimensional structural schematic diagram of the rotor component of the electronic expansion valve according to the second embodiment provided in this application;

[0013] Figure 7 A three-dimensional structural schematic diagram of the rotor component of the electronic expansion valve according to the third embodiment provided in this application;

[0014] Some of the attached figures are labeled with reference to the figure.

[0015] Valve body 10, valve port 11, outer casing 20;

[0016] Rotor assembly 30, rotor 31, rotor seat 32, limiting part 311, nut assembly 40, internal thread part 41, stop part 42, lead screw 50, external thread part 51, lead screw abutment part 52, stop rod 60, body part 61, rod part 62, first bending part 611, abutment part 612, second bending part 613, first connecting part 614, second connecting part 615, spring guide rail 70, sliding part 80, core assembly 90; Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions provided in this application, the technical solutions of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] First Implementation Method

[0019] This application provides an electronic expansion valve, including a rotor component 30, a lead screw 50, and a stop rod 60. The rotor component includes a rotor seat 32, and the lead screw 50 is fixedly connected to the rotor seat 32. Along the axial direction of the electronic expansion valve, at least a portion of the stop rod 60 is located below the rotor seat 32. The stop rod 60 is an integrally formed steel wire structure, including a body portion 61 and a rod portion 62. The rod portion 62 extends from the body portion 61 along the axial direction of the electronic expansion valve.

[0020] The main body 61 includes a base that directly or indirectly abuts against the rotor seat 32 and the lead screw 50. The abutting part and the rod part are located on different sides of the base. The main body 61 also includes an abutting part 612. The rotor component 30 is provided with a limiting part 311. When the rotor component is actuated, the abutting part 612 contacts the limiting part 311 so that the stop rod follows the rotation of the rotor component.

[0021] Through the optimized design of the electronic expansion valve structure described above, the lead screw is positioned below the rotor seat and is axially confined between the rotor seat and the lead screw along the electronic expansion valve. The stop rod is an integrally formed steel wire structure. In the prior art, the stop rod needs to be formed by punching, which generates a lot of waste material during processing. However, the stop rod in this application only needs to be cut from a section of steel wire to form the stop rod structure. The overall structure is simpler than the stop rod structure in the prior art, and the processing is more convenient, which also reduces material waste. In addition, compared with the stop rod structure in the prior art, there is no need to process an axial through hole in the rotor seat, avoiding welding between the stop rod and the rotor seat, simplifying the processing steps of the rotor seat, making the assembly of the stop rod relatively convenient. The connection between the stop rod, the lead screw, and the rotor seat is relatively convenient, which is conducive to realizing automated assembly.

[0022] Please refer to Figures 1-4 This application provides an electronic expansion valve, including a valve body 10 and a housing 20. The valve body 10 is provided with a valve port 11. The valve body 10 can be integral with the valve port or be separately set and then welded and fixed. A transverse connecting pipe is welded and fixed to the side wall interface of the valve body 10, and a longitudinal connecting pipe is welded and fixed to the lower interface of the valve body 10. It also includes a lead screw 50 and a core component 90. The lead screw 50 and the core component 90 can be floated or suspended and supported. The lead screw can move the core component axially. The connection method between the lead screw and the core component is not limited here. The core component 90 can approach or move away from the valve port 11 to adjust the flow rate of the refrigerant flowing through the valve port 11. The refrigerant can enter from the transverse connecting pipe and flow out from the valve port through the vertical connecting pipe, or the refrigerant can also enter from the vertical connecting pipe, enter the valve cavity through the valve port, and then flow out through the transverse connecting pipe. The electronic expansion valve can be a one-way or two-way flow mode. The housing 20 is fixedly connected to the valve body 10 to form a generally closed cavity of the electronic expansion valve.

[0023] The cavity contains a rotor component 30, a nut component 40, a stop rod 60, a portion of a lead screw 50, and a core component 90. The nut component 40 includes a nut body and a connecting part. In this embodiment, the nut component 40 is installed on the valve body 10 by injection molding the metal connecting part as an insert with the plastic nut body into a single structure. The connecting part is welded to the valve body 10 to fix the nut component 40 to the valve body 10 as a whole. Through the fixed connection between the connecting part and the valve body, the closed electronic expansion valve cavity is roughly divided into an upper cavity and a lower cavity. The rotor component and the stop rod are located in the upper cavity. The rotor component 30 includes... The rotor 31 and rotor seat 32 are fixedly connected. Specifically, for example, the rotor seat 32, made of metal, is formed as a metal insert with the rotor 31. The rotor component 30 can also be integrally formed by special magnetic powder material. In this embodiment, the rotor seat 32 and the rotor 31 are set separately. The rotor seat 32 is located at the top of the rotor component 30. The rotor 31 includes a rotor connecting part 312 arranged around the rotor seat 32 and a peripheral part 313 extending downward along the axial direction of the electronic expansion valve. The rotor connecting part 312 is fixedly connected to the rotor seat 32. The rotor seat 32 includes a lower end face 321 of the rotor seat. The connecting part of the lead screw 50 is fixedly connected to the rotor seat 32. The external thread 51 of the lead screw 50 and the internal thread 41 of the nut component 40 are threaded together to form an electronic expansion valve threaded feed mechanism, allowing the lead screw to move along the axial direction of the electronic expansion valve along the core component. The lead screw 50 is provided with a lead screw abutment. It should be noted that the lead screw abutment can also be provided with a gasket separate from the lead screw, or the lead screw abutment can be integrally formed with the lead screw. The gasket can be welded, bonded, or engaged with the lead screw for limiting connection. The specific connection method between the gasket and the lead screw is not limited here. In this embodiment, the lead screw abutment is described as the lead screw step 52. Figure 3As shown, the stop rod 60 includes a body portion 61 and a rod portion 62. The body portion 61 is generally horizontal. The rod portion 62 extends from the body portion 61 along the axial direction of the electronic expansion valve. The spring guide rail 70 is sleeved on the outer periphery of the nut component 40. The sliding member 80 rotates around the spring guide rail 70 along the axial direction of the nut component 40. The rod portion 62 can push the sliding member 80 to rotate downwards to abut against the stop portion 42 of the nut component 40, forming a lower stop limit. The body portion 61 includes a base portion and abutment portion. The abutment portion and the rod portion are located on different sides of the base portion. The lead screw 50 passes through the through hole of the base portion. The base portion can directly abut against the lead screw step portion 52 and the lower end face 321 of the rotor seat. Alternatively, a wear-resistant gasket can be added between the lead screw and the lower end face of the rotor seat, for example, between the lead screw and the base portion. Wear-resistant gaskets are provided between the parts, and / or between the rotor seat and the base, so that the base indirectly abuts against the lead screw step and the lower end face of the rotor seat. The base can be a bent part, a straight section, or other irregular structure. The specific shape of the base is not limited here, as long as it directly or indirectly abuts against the lead screw and the rotor seat to prevent the base from disengaging from the lead screw and the rotor seat when the rotor component rotates. In this embodiment, the base is described as the first bent part 611. The body part 61 includes the first bent part 611, the second bent part 613, the first connecting part 614, and the second connecting part 615. The bending direction of the first bent part is opposite to the bending direction of the second bent part. One side of the first connecting part 614 is connected to the second bent part 613. On the other side, the connecting rod portion 62 is connected to the abutment portion on one side of the second connecting portion 615, and the first bending portion 611 is connected to the first bending portion 611 on the other side. The first bending portion 611 is generally a semi-circular embracing portion, the shape of which is adapted to the outer edge of the connecting portion 53 of the lead screw 50. At least part of the inner edge wall of the embracing portion contacts the outer edge of the connecting portion 53. The first bending portion 611 may also be generally a rectangular portion with an opening, the shape of which is adapted to the shape of the rectangular portion, and at least part of the inner edge wall of the rectangular portion contacts the outer edge of the connecting portion. Alternatively, in other embodiments, the first bending portion 611 may also be a generally V-shaped structure. By setting the base as the first bending portion, the stop rod and the lead screw can be better limited, and when the rotor component is in motion... The embracing part can embrace at least part of the lead screw, preventing it from detaching from the rotor seat and the lead screw, and further ensuring that the stop rod reliably follows the rotation of the rotor component. The abutment part 612 extends from the first bending part 611 in a generally radial direction away from the lead screw 50. The abutment part 612 includes a hook 612A. The rotor component 30 is provided with a limiting part 311. The rotor component 30 includes a rotor 31 and a rotor seat 32. The rotor 31 includes a rotor connecting part 312 disposed around the rotor seat 32 and a peripheral part 313 extending downward in the axial direction. The rotor connecting part 312 is connected to the rotor seat 32. In this embodiment, the limiting part 311 includes a first flange part 311A, which protrudes downward from the rotor connecting part 312 along the axial direction of the electronic expansion valve.The hook 612A clamps the first flange portion 311A ​​through elastic deformation.

[0024] The operating principle of this application is briefly described below. The rotor component 30 is energized by the coil component installed in the housing 20. The rotor component 30 and the lead screw 50 rotate approximately synchronously. The hook portion elastically clamps the flange portion, and the base directly or indirectly abuts against the rotor seat and the lead screw. The stop rod can follow the rotation of the rotor component. Through the above arrangement, the lead screw is located entirely below the rotor seat and is limited to the rotor seat and the lead screw along the axial direction of the electronic expansion valve. The stop rod is a one-piece steel wire structure. In the prior art, the stop rod needs to be formed by punching. The previous process generated a lot of waste material. However, the stop rod in this application can be made by cutting a section of steel wire to form the stop rod structure. The overall structure is simpler than the stop rod structure in the prior art. It is easier to process and can reduce material waste. In addition, compared with the stop rod structure in the prior art, there is no need to process axial through holes in the rotor seat, avoiding welding between the stop rod and the rotor seat, simplifying the processing steps of the rotor seat, making the assembly of the stop rod relatively convenient. The connection between the stop rod and the lead screw and the rotor seat is relatively convenient, which is conducive to realizing the automation of assembly.

[0025] Second Implementation Method

[0026] The difference from the first embodiment lies in the structure of the abutment and the limiting part. In this embodiment, the abutment 612 includes an overlapping part 612B, which includes a horizontal part 6121 and an extension part 6122 extending from the base away from the lead screw. The extension part 6122 extends from the horizontal part 6121 along the axial direction of the electronic expansion valve. The limiting part 311 includes a second flange part 311C, which protrudes from the peripheral part 313 of the rotor 31 toward the lead screw 50. When the rotor component 30 is actuated, the second flange part 311C contacts the extension part 6122 of the overlapping part 612B so that the stop rod can follow the rotation of the rotor component.

[0027] Third Implementation Method

[0028] The difference from the second embodiment is that the structure of the limiting part of the rotor component is different. In the two embodiments described above, the limiting part and the rotor component are an integral structure. In this embodiment, the limiting part and the rotor component are separate. The limiting part 311 includes a stop pin 311B. The peripheral part 313 of the rotor 31 is provided with a channel. The channel penetrates the inner and outer walls of the peripheral part 313. The stop pin 311B is press-fitted with the channel. When the rotor component 30 is actuated, the second flange part 311C contacts the extension part 6122 of the stop pin 311B so that the stop rod can follow the rotation of the rotor component. This also achieves the technical solution of this application.

[0029] It should be noted that the electronic expansion valve provided in this application only provides several examples of specific structures in which the abutment and the limiting part cooperate. In fact, it is impossible to exhaustively list all the structural configurations of the abutment and the limiting part.

[0030] This application provides an electronic expansion valve, including a rotor component 30, a lead screw 50, and a stop rod 60. The rotor component includes a rotor seat 32, and the lead screw 50 is fixedly connected to the rotor seat 32. Along the axial direction of the electronic expansion valve, at least a portion of the stop rod 60 is located below the rotor seat 32. The stop rod 60 is an integrally formed steel wire structure, including a body portion 61 and a rod portion 62. The rod portion 62 extends from the body portion 61 along the axial direction of the electronic expansion valve.

[0031] The main body 61 includes a base that directly or indirectly abuts against the rotor seat 32 and the lead screw 50. The lead screw 50 passes through the through hole of the base. The main body 61 also includes an abutment part 612. The rotor component 30 is provided with a limiting part 311. When the rotor component is actuated, the abutment part 612 contacts the limiting part 311 so that the stop rod follows the rotation of the rotor component.

[0032] Through the optimized design of the electronic expansion valve structure described above, the lead screw is positioned below the rotor seat and is axially confined between the rotor seat and the lead screw along the electronic expansion valve. The stop rod is an integrally formed steel wire structure. In the prior art, the stop rod needs to be formed by punching, which generates a lot of waste material during processing. However, the stop rod in this application only needs to be cut from a section of steel wire to form the stop rod structure. The overall structure is simpler than the stop rod structure in the prior art, and the processing is more convenient, which also reduces material waste. In addition, compared with the stop rod structure in the prior art, there is no need to process an axial through hole in the rotor seat, avoiding welding between the stop rod and the rotor seat, simplifying the processing steps of the rotor seat, making the assembly of the stop rod relatively convenient. The connection between the stop rod, the lead screw, and the rotor seat is relatively convenient, which is conducive to realizing automated assembly.

[0033] It should be noted that the directional terms such as "up," "down," "left," and "right" mentioned in this document are all introduced for ease of description, based on the accompanying drawings. Similarly, the ordinal numbers such as "first" and "second" in the component names are also introduced for ease of description and do not imply any limitation on the order of the components. Furthermore, since some parts of the components provided in the above embodiments have the same function, this specification adopts a unified naming convention for these parts. The electronic expansion valve provided by the relevant technical solution has been described in detail above. Specific embodiments have been used in this document for illustration. The descriptions of the above embodiments are only for helping to understand the method and core ideas of the present invention and are not intended to limit the present invention in any way.

Claims

1. An electronic expansion valve, characterized in that, The device includes a rotor assembly, a lead screw, and a stop rod. The rotor assembly includes a rotor seat, and the lead screw is connected to the rotor seat along the axial direction of the electronic expansion valve. At least a portion of the stop rod is located below the rotor seat. The stop rod is an integrally formed steel wire structure, including a body and a rod portion, with the rod portion extending from the body portion along the axial direction of the electronic expansion valve. The main body includes a base that directly or indirectly abuts against the rotor seat and the lead screw. The main body also includes a stop portion that is located on a different side of the base from the rod portion. The rotor component is provided with a limiting portion. When the rotor component is actuated, the stop portion contacts the limiting portion, and the stop rod follows the rotation of the rotor component.

2. The electronic expansion valve according to claim 1, characterized in that, The abutting part includes a hook part, the limiting part includes a first flange part, the rotor component includes a rotor body, the rotor body includes a rotor connecting part and a peripheral part, the rotor connecting part is connected to the rotor seat, the peripheral part extends along the axial direction of the electronic expansion valve, the first flange part protrudes downward from the rotor connecting seat along the axial direction of the electronic expansion valve, and the hook part can undergo elastic deformation to clamp the first flange part.

3. The electronic expansion valve according to claim 1, characterized in that, The abutting part includes an overlapping part, which includes a horizontal part and an extension part. The extension part extends downward from the horizontal part along the axial direction of the electronic expansion valve. The limiting part includes a second flange part. The rotor component includes a rotor body, which includes a rotor connecting part and a peripheral part. The rotor connecting part is connected to the rotor seat. The peripheral part extends along the axial direction of the electronic expansion valve. The second flange part protrudes inward from the peripheral part in a generally radial direction. The extension part can contact the second flange part.

4. An electronic expansion valve according to claim 1, characterized in that, The abutment portion includes an overlapping portion, which includes a horizontal portion and an extension portion. The extension portion extends downward along the axial direction of the electronic expansion valve from the horizontal portion. The limiting portion includes a stop pin. The rotor component includes a rotor body, which includes a rotor connecting portion and a peripheral portion. The rotor connecting portion is connected to the rotor seat. The stop pin is press-fitted with the channel portion of the peripheral portion. The extension portion can contact the stop pin.

5. An electronic expansion valve according to any one of claims 1-4, characterized in that, The base is a first bent portion, and the stop rod includes a second bent portion. The bending direction of the first bent portion is opposite to that of the second bent portion. The stop rod also includes a first connecting portion and a second connecting portion. One side of the first connecting portion is connected to the second bent portion, and the other side of the first connecting portion is connected to the rod portion. One side of the second connecting portion is connected to the abutment portion, and the other side of the second connecting portion is connected to the second bent portion.

6. An electronic expansion valve according to claim 5, characterized in that, The first bending part is a roughly semi-circular embracing part, the shape of which is adapted to the shape of the outer edge of the connecting part of the lead screw, and the inner edge wall of the embracing part is at least partially in contact with the outer edge of the connecting part.

7. An electronic expansion valve according to claim 5, characterized in that, The first bending portion is a rectangular portion that is generally open. The shape of the outer edge of the connecting portion of the lead screw is adapted to the shape of the rectangular portion. The inner edge wall of the rectangular portion is at least partially in contact with the outer edge of the connecting portion.

8. The electronic expansion valve according to claim 5, characterized in that, The lead screw includes a lead screw abutment portion, which includes a lead screw step portion, and the first bent portion directly abuts against the lead screw step portion and the rotor seat.

9. The electronic expansion valve according to claim 5, characterized in that, The lead screw includes a lead screw abutment portion, the lead screw abutment portion includes a gasket, the gasket is fixedly connected to or limited to the lead screw, and the first bent portion abuts against the gasket and the rotor seat.

10. The electronic expansion valve according to any one of claims 1-4, characterized in that, The electronic expansion valve also includes a nut component, a valve body, a spring guide rail, and a sliding member. The nut component is fixedly connected to the valve body. The spring guide rail is sleeved on the outer periphery of the nut component. The sliding member can rotate around the spring guide rail along the axial direction of the nut component. The rod can push the sliding member to rotate downwards to abut against the stop portion of the nut component for stop and limit.

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