An electronic expansion valve

Abstract

This invention discloses an electronic expansion valve, comprising a first valve body and a second valve body, which are fixedly connected. The electronic expansion valve is further configured with a driving component. A valve cavity is formed within the second valve body, and the second valve body has a valve port. The driving component is connected to a valve core for driving the valve core to move within the valve cavity. It also includes an annular seal, which is installed on one of the valve core or the second valve body. The other of the valve core or the second valve body has an abutment surface capable of axially contacting the annular seal. The axial distance between the annular seal and the abutment surface is L1, and the axial distance between the lower end of the valve core and the valve port is L2. Before the abutment surface abuts against the annular seal axially, L1 and L2 satisfy the condition L1≤L2. In the above-described electronic expansion valve, the seal does not need to be continuously subjected to pressure and friction, thus ensuring a better service life.

Description

Technical Field

[0001] This invention relates to the field of valve device technology, and more specifically to an electronic expansion valve. Background Technology

[0002] Electronic expansion valves are commonly used in refrigeration systems. By moving the valve core closer to or further away from the valve port, the flow rate of refrigerant can be adjusted. In a typical electronic expansion valve, the valve core constantly compresses and rubs against the seals during its displacement, which can affect the service life of the seals. Summary of the Invention

[0003] The purpose of this invention is to provide an electronic expansion valve in which the sealing element does not need to be continuously subjected to pressure and friction, thus ensuring a better service life.

[0004] To solve the above-mentioned technical problems, the present invention provides an electronic expansion valve, including a first valve body and a second valve body, the first valve body and the second valve body being fixedly connected. The electronic expansion valve is further configured with a driving component. A valve cavity is formed in the second valve body, and the second valve body has a valve port. The driving component is connected to a valve core for driving the valve core to move within the valve cavity. It also includes an annular seal, which is installed on one of the valve core and the second valve body. The other of the valve core and the second valve body has an abutment surface capable of contacting the annular seal axially. The axial distance between the annular seal and the abutment surface is L1, and the axial distance between the lower end of the valve core and the valve port is L2. Before the abutment surface contacts the annular seal axially, L2 and L2 satisfy the condition L1≤L2.

[0005] By controlling the axial distance L1 between the annular seal and the contact surface before contact and the axial distance L2 between the lower end of the valve core and the valve port, it is possible to ensure that when the lower end of the valve core is relatively close to or reaches the valve port, the contact surface contacts or presses against the annular seal, thus meeting the sealing requirements when the valve is closed. Conversely, when the lower end of the valve core is relatively far from the valve port, the contact surface will also move axially away from the annular seal to avoid contact. This significantly reduces the risk of continuous compression and friction on the annular seal, thereby extending its service life.

[0006] Optionally, the outer peripheral wall of the valve core is provided with a first radially outward protrusion, the annular seal is sleeved on the valve core and is elastically connected or limitedly connected to the valve core, and the annular seal also abuts against the first radially outward protrusion along the axial direction.

[0007] Optionally, the outer peripheral wall of the valve core is further provided with a second radially outward protrusion, the second radially outward protrusion being located below the first radially outward protrusion, and a first annular groove being formed between the first radially outward protrusion and the second radially outward protrusion, the annular seal being fitted into the first annular groove; the outer diameter of the second radially outward protrusion is smaller than that of the annular seal, and in the installed state, the upper end of the annular seal abuts against the first radially outward protrusion, and the lower end of the annular seal is partially exposed radially for abutting against the contact surface provided on the second valve body.

[0008] Optionally, the inner wall of the second valve body is formed with a first stop portion, the annular seal is elastically connected or limitedly connected to the inner wall of the second valve body, and the annular seal also abuts against the first stop portion along the axial direction.

[0009] Optionally, the inner wall of the second valve body is further provided with a second stop portion, which is located above the first stop portion. A second annular groove is formed between the first stop portion and the second stop portion, and the annular seal is fitted into the second annular groove. The inner diameter of the second stop portion is larger than that of the annular seal. In the installed state, the lower end of the annular seal abuts against the first stop portion, and the upper end of the annular seal is partially exposed radially to abut against the contact surface provided on the valve core.

[0010] Optionally, the inner wall of the second valve body is provided with a two-stage stepped portion, the two-stage stepped portion including a first upper stepped surface and a second upper stepped surface, the first upper stepped surface being located below the second upper stepped surface, the first upper stepped surface and the second upper stepped surface being connected by a side stepped surface, the first upper stepped surface forming the first stop portion; it also includes an annular baffle, the annular baffle being installed on the second upper stepped surface, the inner diameter of the annular baffle being smaller than the second upper stepped surface, the annular baffle forming the second stop portion.

[0011] Optionally, the side step surface and the first upper step surface are connected by a first conical surface, or the side step surface is a first conical surface; the abutment surface of the valve core is a second conical surface, or the abutment surface of the valve core is connected to the outer wall surface of the valve core by a second conical surface.

[0012] Optionally, the second valve body includes a body portion and a valve sleeve portion, with one of the annular seal and the abutment surface disposed in the valve sleeve portion.

[0013] Optionally, the driving component includes a rotor and a driving rod fixedly connected to the rotor. At least a portion of the driving rod has external threads and is screwed with a nut, which is fixedly connected to the valve core. It also includes a limiting component, one of which, along with the nut, has a limiting portion, and the other has a hole-shaped or groove-shaped limiting mating portion. The limiting portion is inserted into the limiting mating portion to restrict the rotation of the nut relative to the limiting component and to guide the nut to move axially within the driving rod.

[0014] Optionally, the nut is fixed to the valve core by a retaining ring; and / or, the limiting member is cylindrical, the drive rod is inserted into the limiting member, and is fixedly connected to the limiting member by a bearing. Attached Figure Description

[0015] Figure 1 A cross-sectional view of a specific embodiment of the electronic expansion valve provided by the present invention when the valve is closed;

[0016] Figure 2 for Figure 1 Cross-sectional view when the valve is open;

[0017] Figure 3 for Figure 1 Connection structure diagram of the valve core and the annular seal;

[0018] Figure 4 for Figure 1 A schematic diagram of the structure of the second valve body;

[0019] Figure 5 A connection structure diagram of the second valve body and the annular seal, which is another specific embodiment of the electronic expansion valve provided by the present invention;

[0020] Figure 6 for Figure 5 Schematic diagram of the structure of the middle valve sleeve;

[0021] Figure 7 To and Figure 5 A partial structural diagram of the valve core that is adapted to the second valve body.

[0022] Figures 1-7 The annotations in the accompanying drawings are explained as follows:

[0023] 1 First valve body, 11 Drive component, 111 Rotor, 112 Drive rod, 113 Nut, 113a Limiting part, 114 Retaining ring, 12 Limiting component, 121 Limiting mating part, 13 Bearing component;

[0024] 2. Second valve body, 21. Valve cavity, 211. Valve port, 22. Valve core, 221. First radial outward protrusion, 222. Second radial outward protrusion, 223. Second abutment surface, 224. Second conical surface, 225. First annular groove, 23. Body portion, 24. Valve sleeve portion, 241. Secondary step portion, 241a. First upper step surface, 241b. Second upper step surface, 241c. Side step surface, 241d. First conical surface, 242. Annular baffle, 243. Second annular groove, 244. First abutment surface;

[0025] 3. Annular seal;

[0026] 4. Takeover. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The terms "first" and "second" used in this article are used only for the convenience of describing two or more structures or components that are identical or similar in structure and / or function, and do not indicate any special limitation on order and / or importance.

[0029] Please refer to Figures 1-7 , Figure 1 This is a cross-sectional view of a specific embodiment of the electronic expansion valve provided by the present invention when the valve is closed. Figure 2 for Figure 1 Cross-sectional view when the valve is open. Figure 3 for Figure 1 Connection structure diagram of the valve core and the annular seal. Figure 4 for Figure 1 A schematic diagram of the structure of the second valve body. Figure 5 This diagram illustrates the connection structure between the second valve body and the annular seal, representing another specific embodiment of the electronic expansion valve provided by the present invention. Figure 6 for Figure 5 Schematic diagram of the structure of the middle valve sleeve. Figure 7 To and Figure 5 A partial structural diagram of the valve core that is adapted to the second valve body.

[0030] like Figure 1 , Figure 2As shown, the present invention provides an electronic expansion valve, including a first valve body 1 and a second valve body 2, which are fixedly connected. The electronic expansion valve is also equipped with a drive component 11. A valve cavity 21 is formed inside the second valve body 2. The second valve body 2 is also connected to two connecting pipes 4. The channels inside the two connecting pipes 4 can communicate with the valve cavity 21. A valve port 211 is provided at the connection between the valve cavity 21 and one of the connecting pipes 4, which in the figure specifically refers to the connection with the downward-facing connecting pipe 4. The drive component 11 can be connected to a valve core 22 and can drive the valve core 22 to move within the valve cavity 21 to close or open the valve port 211, thereby adjusting the communication state of the two connecting pipes 4.

[0031] Furthermore, it also includes an annular seal 3. One of the valve core 22 and the second valve body 2 is used to install the annular seal 3. The other of the valve core 22 and the second valve body 2 is provided with an abutment surface that can contact the annular seal 3 axially. The axial distance between the annular seal 3 and the abutment surface is L1. The axial distance between the lower end of the valve core 22 and the valve port 211 is L2. Before the abutment surface and the annular seal 3 abut axially, L1 and L2 satisfy the condition L1≤L2.

[0032] This configuration, by controlling the axial distance L1 between the annular seal 3 and the contact surface before contact and the axial distance L2 between the lower end of the valve core 22 and the valve port 211, ensures that when the lower end of the valve core 22 is relatively close to or reaches the valve port 211, the contact surface contacts or presses against the annular seal 3, thus meeting the sealing requirements when the valve is closed. When the contact surface contacts the annular seal 3 axially, and the lower end of the valve core 22 is relatively far from the valve port 211, the contact surface will also be relatively far away from the annular seal 3 axially, so as not to contact the annular seal 3. This can largely avoid the annular seal 3 being subjected to continuous compression and friction, thereby ensuring the service life of the annular seal 3.

[0033] It should be noted that the axial distance between the contact surface and the annular seal 3 refers to the axial distance between the two positions where the contact surface and the annular seal 3 come into contact when the valve core 22 moves axially. The axial direction refers to the axial direction of the valve core 22, which is also the direction of movement of the valve core 22. In addition, although the compression between the contact surface and the annular seal 3 is achieved through the axial displacement of the valve core 22, this does not mean that the compressive force on the annular seal 3 is only axial. That is to say, the compression state of the annular seal 3 is not necessarily only axial compression, but may also include radial compression. This depends on the shape of the contact surface, which is also mentioned in the detailed description later. The annular seal 3 can be a sealing ring or a sealing gasket, and its material can be rubber or other elastic materials.

[0034] Here, the embodiments of the present invention do not limit the specific value of the difference between L2 and L1. This is specifically related to the compression limit of the annular seal 3, which in turn is related to the type, material, size, etc. of the annular seal 3 used. It can be understood that the difference between L2 and L1 should not be too large, so as to avoid exceeding the compression limit of the annular seal 3, and the resulting fatigue damage of the annular seal 3 and the inability of the valve port 211 to close. Alternatively, the axial displacement of the contact surface from contacting the annular seal 3 to the point where the annular seal 3 is in the compression limit state can be defined as S. Then, L2-L1≤S.

[0035] In one embodiment, the annular seal 3 can be installed on the valve core 22.

[0036] Specifically, such as Figures 1-4 As shown, the outer peripheral wall of the valve core 22 may be provided with a first radially outward protrusion 221. The annular seal 3 may be sleeved on the valve core 22 and may be elastically connected or limitedly connected to the valve core 22. The annular seal 3 may also abut against the first radially outward protrusion 221 axially. In this case, the abutment surface may be located on the second valve body 2. For ease of distinction, the abutment surface located on the second valve body 2 may be referred to as the first abutment surface 244. Thus, when the valve core 22 is relatively close to or reaches the valve port 211, the annular seal 3, under the action of the first radially outward protrusion 221, can abut against the first abutment surface 244, thereby achieving a seal. Figure 1 At this time, the compression state of the annular seal 3 is mainly the axial compression state.

[0037] The elastic connection here refers to the fact that the annular seal 3 can be tightly bound to the outer peripheral wall of the valve core 22 by means of elastic force, while the limiting connection here refers to the fact that the annular seal 3 is restricted to a specific axial position of the valve core 22 by means of mechanical structure, etc.

[0038] In this embodiment of the invention, a limiting connection scheme is preferably adopted, specifically as follows: Figure 3 As shown, at this time, the peripheral wall of the valve core 22 may also be provided with a second radially outward protrusion 222, and the aforementioned annular seal 3 may be fitted between the first radially outward protrusion 221 and the second radially outward protrusion 222 to limit the axial installation position of the annular seal 3 in the valve core 22.

[0039] Both the first radially outward protrusion 221 and the second radially outward protrusion 222 can be manufactured separately and then installed onto the valve core 22 via welding, snap-fit, or threaded connection. Alternatively, these two radially outward protrusions can also be shoulders formed by abrupt changes in the radial dimension of the valve core 22; this approach can be referenced from [reference needed]. Figure 3 .

[0040] A first annular groove 225 can be formed between the first radially outward protrusion 221 and the second radially outward protrusion 222, and the annular seal 3 can be installed within the first annular groove 225. Figure 3 The second radially protruding portion 222 can be located below the first radially protruding portion 221, and the outer diameter of the second radially protruding portion 222 can be smaller than that of the annular seal 3. In the installed state, the upper end of the annular seal 3 can abut against the first radially protruding portion 221, and the lower end of the annular seal 3 can be partially exposed radially. In this way, when the valve is closed, the exposed part of the lower end of the annular seal 3 can abut against the first contact surface 244 to form a seal.

[0041] Here, the embodiments of the present invention only limit the relationship between the outer diameter of the annular seal 3 and the outer diameter of the second radially protruding portion 222, but do not limit the relationship between the outer diameter of the annular seal 3 and the outer diameter of the first radially protruding portion 221. The outer diameter of the first radially protruding portion 221 can be larger than or smaller than the annular seal 3. However, it should be noted that the first radially protruding portion 221 has an axial limiting effect on the annular seal 3. That is to say, even if the outer diameter of the first radially protruding portion 221 is smaller than the annular seal 3, it cannot be too much smaller, so as to ensure the axial limiting effect of the first radially protruding portion 221 on the annular seal 3.

[0042] In another embodiment, the annular seal 3 can be installed on the second valve body 2.

[0043] Specifically, the inner wall of the second valve body 2 may have a first stop portion, and the annular seal 3 may be elastically connected or limitedly connected to the inner wall of the second valve body 2. The annular seal 3 may also abut against the first stop portion axially. In this case, the abutment surface may be located on the valve core 22. For ease of distinction, the abutment surface located on the valve core 22 may be referred to as the second abutment surface 223. Thus, when the valve core 22 is relatively close to or reaches the valve port 211, the annular seal 3, under the action of the first stop portion, can abut against the second abutment surface 223, thereby achieving a seal.

[0044] The meanings of flexible connection and limit connection are basically the same as those mentioned above, and will not be repeated here.

[0045] Furthermore, the inner wall of the second valve body 2 may also be provided with a second stop portion, which may be located above the first stop portion. A second annular groove 243 may be formed between the first stop portion and the second stop portion, and the aforementioned annular seal 3 may be fitted into the second annular groove 243. The inner diameter of the second stop portion may be larger than that of the annular seal 3. In the installed state, the lower end of the annular seal 3 may abut against the first stop portion, and the upper end of the annular seal 3 may be partially exposed radially. These exposed portions are used to abut against the second contact surface 223 provided on the valve core 2.

[0046] Similar to the aforementioned first radially protruding portion 221 and second radially protruding portion 222, the first stop portion and the second stop portion may also be separately manufactured components or stepped portions formed by abrupt changes in the radial dimension of the inner wall of the second valve body 2.

[0047] In embodiments of the present invention, such as Figures 5-7 As shown, the inner wall of the second valve body 2 may be provided with a secondary step portion 241. The secondary step portion 241 includes a first upper step surface 241a and a second upper step surface 241b. The first upper step surface 241a may be located below the second upper step surface 241b. The first upper step surface 241a and the second upper step surface 241b may be connected by a side step surface 241c. The first upper step surface 241a may form the aforementioned first stop portion. The annular seal 3 may be installed between the first upper step surface 241a and the side step surface 241c. It may also include an annular baffle 242. The annular baffle 242 may be installed on the second upper step surface 241b. The inner diameter of the annular baffle 242 may be smaller than that of the second upper step surface 241b. In this case, the annular baffle 242 may form the aforementioned second stop portion. The second annular groove 243 may be formed between the annular baffle 242 and the first upper step surface 241a.

[0048] When the valve is closed, the compression state of the annular seal 3 is related to the structural shape of the second contact surface 223 and the second annular groove 243.

[0049] If the second contact surface 223 is perpendicular to the outer wall surface of the valve core 22 and there is a right angle transition between them, and the first upper step surface 241a and the side step surface 241c also have a right angle transition, then the compression state of the annular seal 3 is mainly axial compression.

[0050] And in Figure 6 , Figure 7 In this embodiment, the side step surface 241c and the first upper step surface 241a can be transitionally connected by the first conical surface 241d, or the side step surface 241c can be the first conical surface 241d; the abutment surface provided on the valve core 22 can be the second conical surface 224, or the abutment surface provided on the valve core 22 and the outer wall surface of the valve core 22 can be transitionally connected by the second conical surface 224. Therefore, when the valve is closed, the annular seal 3 also bears the compressive force between the first conical surface 241d and the second conical surface 224. At this time, the annular seal 3 is also subjected to radial compression.

[0051] Furthermore, the second valve body 2 may include a body portion 23 and a valve sleeve portion 24. The valve sleeve portion 24 may be installed on the body portion 23 and used to connect with the first valve body 1. When the abutment surface is provided on the valve core 22, the aforementioned second annular groove 243 may be provided on the valve sleeve portion 24; when the abutment surface is provided on the second valve body 2, the abutment surface may be provided on the valve sleeve portion 24.

[0052] The above embodiments of the present invention mainly describe the part associated with the annular seal 3. The following embodiments of the present invention will also describe the relevant structure of the drive component 11. Generally speaking, there are many possible structural forms for the drive component 11, as long as it can achieve the axial displacement of the valve core 22.

[0053] like Figure 1 As shown, in one specific embodiment, the driving component 11 may include a rotor 111 and a driving rod 112 fixedly connected to the rotor 111. The driving rod 112 has at least a partial external thread and is screwed with a nut 113. The nut 113 can be fixedly connected to the valve core 22. It may also include a limiting component 12. One of the limiting component 12 and the nut 113 may have a limiting part 113a, and the other may have a hole-shaped or groove-shaped limiting mating part 121. The limiting part 113a can be inserted into the limiting mating part 121 to limit the rotation of the nut 113 relative to the limiting component 12 and guide the nut 113 to move axially in the driving rod 112.

[0054] Under the action of an external signal, the rotor 111 can rotate, which in turn drives the drive rod 112 to rotate. The nut 113 is a nut-like component. Due to the action of the limiting component 12, it cannot rotate synchronously with the drive rod 112. The threaded engagement between it and the drive rod 112 allows it to move along the axial direction of the drive rod 112, thereby driving the valve core 22 to move in the axial direction, thus realizing the opening or closing of the valve.

[0055] In the above scheme, the rotor 111 is directly connected to the lead screw 112, and the lead screw 112 is directly connected to the valve core 22 through the nut 113, making the overall structure relatively simple.

[0056] The nut 113 and valve core 22 can be fixed in various ways, as long as a reliable connection between the two can be achieved. Alternatively, the nut 113 and valve core 22 can be set as an integral structure, that is, a structure that cooperates with the drive rod 112 can be set on the valve core 22, which can also achieve effective transmission between the drive rod 112 and the valve core 22.

[0057] In this embodiment of the invention, the nut 113 can be fixed to the valve core 22 by a retaining ring 114. The retaining ring 114 and the valve core 22 can be fixed by welding, screw connection, riveting, etc.

[0058] The limiting member 12 can be cylindrical, and the driving rod 112 can be inserted into the limiting member 12 and fixed to the limiting member 12 through the bearing member 13. In this way, the rotation of the driving rod 112 will not affect the limiting member 12.

[0059] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An electronic expansion valve, comprising a first valve body (1) and a second valve body (2), the first valve body (1) and the second valve body (2) being fixedly connected, the electronic expansion valve further comprising a drive component (11), a valve cavity (21) being formed within the second valve body (2), the second valve body (2) having a valve port (211), the drive component (11) being connected to a valve core (22) for driving the valve core (22) to move within the valve cavity (21), characterized in that, It also includes an annular seal (3), one of the valve core (22) and the second valve body (2) is fitted with the annular seal (3), and the other of the valve core (22) and the second valve body (2) is provided with an abutment surface that can contact the annular seal (3) axially. The axial distance between the annular seal (3) and the abutment surface is L1, and the axial distance between the lower end of the valve core (22) and the valve port (211) is L2. Before the abutment surface abuts against the annular seal (3) axially, L1 and L2 satisfy the condition L1≤L2. When the lower end of the valve core (22) is in the position of reaching the valve port (211), the abutment surface and the annular seal (3) are pressed against each other axially.

2. The electronic expansion valve according to claim 1, characterized in that, The outer peripheral wall of the valve core (22) is provided with a first radial outward protrusion (221). The annular seal (3) is sleeved on the valve core (22) and is elastically connected or limitedly connected to the valve core (22). The annular seal (3) also abuts against the first radial outward protrusion (221) along the axial direction.

3. The electronic expansion valve according to claim 2, characterized in that, The outer peripheral wall of the valve core (22) is also provided with a second radial protrusion (222), which is located below the first radial protrusion (221). A first annular groove (225) is formed between the first radial protrusion (221) and the second radial protrusion (222), and the annular seal (3) is fitted into the first annular groove (225). The outer diameter of the second radial protrusion (222) is smaller than that of the annular seal (3). In the installed state, the upper end of the annular seal (3) abuts against the first radial protrusion (221), and the lower end of the annular seal (3) is partially exposed radially to abut against the contact surface provided on the second valve body (2).

4. The electronic expansion valve according to claim 1, characterized in that, The inner wall of the second valve body (2) has a first stop portion, and the annular seal (3) is elastically connected or limited to the inner wall of the second valve body (2), and the annular seal (3) also abuts against the first stop portion along the axial direction.

5. The electronic expansion valve according to claim 4, characterized in that, The inner wall of the second valve body (2) is also provided with a second stop portion, which is located above the first stop portion. A second annular groove (243) is formed between the first stop portion and the second stop portion, and the annular seal (3) is fitted into the second annular groove (243). The inner diameter of the second stop is larger than that of the annular seal (3). In the installed state, the lower end of the annular seal (3) abuts against the first stop, and the upper end of the annular seal (3) is partially exposed in the radial direction to abut against the contact surface of the valve core (22).

6. The electronic expansion valve according to claim 5, characterized in that, The inner wall of the second valve body (2) is provided with a two-stage step portion (241). The two-stage step portion (241) includes a first upper step surface (241a) and a second upper step surface (241b). The first upper step surface (241a) is located below the second upper step surface (241b). The first upper step surface (241a) and the second upper step surface (241b) are connected by a side step surface (241c). The first upper step surface (241a) forms the first stop portion. It also includes an annular baffle (242), which is installed on the second upper step surface (241b). The inner diameter of the annular baffle (242) is smaller than that of the second upper step surface (241b), and the annular baffle (242) forms the second stop portion.

7. The electronic expansion valve according to claim 6, characterized in that, The side step surface (241c) and the first upper step surface (241a) are connected by a first conical surface (241d), or the side step surface (241c) is the first conical surface (241d). The contact surface of the valve core (22) is a second conical surface (224), or the contact surface of the valve core (22) and the outer wall surface of the valve core (22) are connected by the second conical surface (224).

8. The electronic expansion valve according to claim 1, characterized in that, The second valve body (2) includes a body part (23) and a valve sleeve part (24), and one of the annular seal (3) and the abutment surface is disposed on the valve sleeve part (24).

9. The electronic expansion valve according to any one of claims 1-8, characterized in that, The drive component (11) includes a rotor (111) and a drive rod (112) fixedly connected to the rotor (111). The drive rod (112) has at least a partial external thread and is screwed with a nut (113). The nut (113) is fixedly connected to the valve core (22). It also includes a limiting member (12). One of the limiting member (12) and the nut member (113) is provided with a limiting part (113a), and the other is provided with a limiting mating part (121) of the hole type or the groove type. The limiting part (113a) is inserted into the limiting mating part (121) to limit the rotation of the nut member (113) relative to the limiting member (12) and guide the nut member (113) to move axially in the drive rod (112).

10. The electronic expansion valve according to claim 9, characterized in that, The nut (113) is fixed to the valve core (22) by a retaining ring (114); and / or, The limiting member (12) is cylindrical, and the driving rod (112) is inserted into the limiting member (12) and fixedly connected to the limiting member (12) through the bearing member (13).

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