Electronic expansion valve and method for assembling an electronic expansion valve

Abstract

The application provides an electronic expansion valve and an assembling method thereof, which comprises a valve body, a nut seat, a valve needle component and a rotor component. The valve body has a containing cavity and a valve port. The nut seat is arranged in the containing cavity and has a first inner threaded hole coaxial with the valve port. The valve needle component is arranged in the containing cavity and has a screw rod and a valve needle body arranged oppositely along an axial direction. The valve needle body is arranged close to the valve port and can adjust the flow at the valve port. The screw rod has a matching thread, and the screw rod is threadedly connected with the first inner threaded hole through the matching thread. The rotor component is rotatably arranged in the containing cavity and located on the side of the nut seat away from the valve port. The rotor component is provided with a second inner threaded hole. The matching thread on the rotor component and the screw rod is threadedly connected through the second inner threaded hole, and the rotor component and the screw rod are fixedly connected. The application can solve the problem that the flow of the valve needle component at the full closing position is inconsistent between single products of the same batch of electronic expansion valves in the prior art.

Description

Technical Field

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

[0002] As a key component for precisely controlling refrigerant flow in refrigeration systems, the performance of electronic expansion valves directly affects the energy efficiency and stability of refrigeration equipment such as air conditioners and refrigerators. In electronic expansion valves, the position control of the valve needle is the core element ensuring accurate flow regulation.

[0003] An electronic expansion valve typically includes a valve body, a nut seat, a valve needle assembly, and a rotor assembly. The valve body has an interconnected valve cavity and a valve port. The nut seat is located within the valve cavity, and the valve needle assembly passes through the nut seat and is threaded into it. One end of the valve needle assembly is used to regulate the flow rate at the valve port, while the other end is located on the side of the nut seat away from the valve port. This end of the valve needle assembly away from the valve port is connected to the rotor assembly. As the rotor assembly rotates, the valve needle assembly moves axially through the threaded engagement between it and the nut seat, thereby regulating the flow rate at the valve port.

[0004] In related technologies, the rotor component has a smooth mounting port, and the end of the valve needle component away from the valve port passes through the mounting port and is fixedly connected to the rotor component. During the assembly of the electronic expansion valve, the valve needle component is installed first, threaded onto the nut seat, and rotated until it just contacts the valve port. Then, according to the flow requirement, the valve needle component is rotated clockwise or counterclockwise by a certain angle to the required fully closed position. Next, the rotor component is installed, and the rotor component and valve needle are fixedly connected. The rotation process is the timing pulse process during valve needle component installation. In related technologies, the timing pulse process is usually achieved by manually rotating the valve needle component to the required fully closed position. It is difficult to control the consistency of the rotation angle during the manual timing pulse process between individual valve components in the same batch, resulting in inconsistent flow rates of the valve needle components in the fully closed position between individual products in the same batch. Summary of the Invention

[0005] This invention provides an electronic expansion valve and an assembly method for the electronic expansion valve, in order to solve the problem of inconsistent flow rates of the valve needle component in the fully closed position among individual products in the same batch in the prior art.

[0006] This invention provides an electronic expansion valve, comprising: a valve body having a receiving cavity and a valve port; a nut seat disposed within the receiving cavity, the nut seat having a first internal threaded hole coaxial with the valve port; a valve needle component disposed within the receiving cavity, the valve needle component having a screw and a valve needle body disposed opposite to each other along the axial direction, the valve needle body being disposed close to the valve port and capable of adjusting the flow rate at the valve port, the screw having a mating thread, the screw being threadedly connected to the first internal threaded hole through the mating thread; and a rotor component rotatably disposed within the receiving cavity and located on the side of the nut seat away from the valve port, the rotor component having a second internal threaded hole, the mating threads on the rotor component and the screw being threadedly connected through the second internal threaded hole, the rotor component and the screw being fixedly connected.

[0007] Furthermore, the mating threads on the screw are continuous mating threads, and the first internal thread hole and the second internal thread hole are respectively threadedly connected to the valve needle component through mating threads.

[0008] Furthermore, the electronic expansion valve also includes: a first stop portion disposed on the nut seat; a second stop portion disposed on the rotor assembly; the valve needle assembly has a limit position, when the valve needle assembly is in the limit position, the first stop surface of the first stop portion abuts against the second stop surface of the second stop portion, and the screw can no longer move toward the valve port or can no longer move away from the valve port.

[0009] Further, the thread of the first internal threaded hole is a first internal thread segment, and the thread of the second internal threaded hole is a second internal thread segment; the projection of the axis of the first internal threaded hole onto the first reference plane is the first base point O1, the projection of the first stop surface onto the first reference plane is the first line segment, the extension line of the first line segment passes through the first base point O1, and the first line segment has point A1; the projection of the starting point of the first internal thread segment onto the first reference plane is point A2; the angle formed by the line connecting the first line segment and the first base point O1, and the line connecting point A2 and the first base point O1, is Q1; the second internal threaded hole... The projection of the axis onto the second reference plane is the second base point O2; the projection of the second stop surface onto the second reference plane is the second line segment, the extension of the second line segment passes through the second base point O2, and the second line segment has a point B1; the projection of the starting point of the second internal thread segment onto the second reference plane is point B2; the angle formed by the line connecting the second line segment and the second base point O2, and the line connecting point B2 and the second base point O2, is Q2; wherein, the difference between Q2 and Q1 is a constant; the first reference plane is perpendicular to the axis of the first internal thread hole, and the second reference plane is perpendicular to the axis of the second internal thread hole.

[0010] Furthermore, the electronic expansion valve also includes: a third stop portion disposed on the rotor component, the third stop portion being located on the side of the second stop portion closer to the valve port; the limit positions include a lower limit position and an upper limit position, when the valve needle component is in the lower limit position, the first stop portion and the second stop portion engage in stop engagement, and the screw can no longer move toward the valve port; when the valve needle component is in the upper limit position, the first stop portion and the third stop portion engage in stop engagement, and the screw can no longer move away from the valve port.

[0011] Furthermore, when the valve needle component is in its limit position, the overlap dimension of the second stop surface and the first stop surface in the axial direction of the valve needle component is h1; the pitch of the mating thread is h, h1 < h; and / or, the assembly clearance between the thread of the first internal thread hole and the mating thread in the axial direction of the valve needle component is h2, h1 > h2.

[0012] Furthermore, the rotor component includes a connecting plate located at the end of the nut seat away from the valve port, a second internal threaded hole being provided on the side of the connecting plate near the nut seat, a second stop being provided on the side of the connecting plate near the nut seat, and a first stop being provided on the outer wall of the end of the nut seat near the connecting plate.

[0013] Furthermore, the pitch of the mating thread is h; the distance between the starting point of the first internal thread segment and the end of the first stop near the connecting plate is h5; the distance between the starting point of the second internal thread segment and the end of the second stop away from the connecting plate is h4; when the valve needle component is in the extreme position, the distance between the starting point of the first internal thread segment and the starting point of the second internal thread segment in the axial direction of the valve needle component is h3; where h3=h4+h5-h1; h3 / h=n, the remainder is c, n is the integer number of turns of the mating thread on the screw between the starting point of the second internal thread segment and the starting point of the first internal thread segment when the valve needle component is in the extreme position; Q2-Q1=c*360°.

[0014] Furthermore, the screw and rotor components are positioned in a limiting fit along the axial direction of the valve needle component.

[0015] Furthermore, an assembly hole is provided on the side of the connecting plate away from the nut seat. The assembly hole communicates with the first internal threaded hole, and a stepped surface is formed between the assembly hole and the first internal threaded hole. The screw passes through the first internal threaded hole and the assembly hole. The screw has a stepped structure, and the stepped surface abuts against the stepped structure.

[0016] Furthermore, the distance between the stepped surface and the bottom end of the second stop is h7; the distance between the top end of the first stop and the upper end face of the valve port is h8; when the valve needle component is in the limit position, the screw can no longer move towards the valve port, the valve needle body is inserted into the valve port, the bottom end face of the valve needle body is located below the upper end face of the valve port, and the distance between the upper end face of the valve port and the bottom end face of the valve needle body is h9; the distance between the stepped structure of the valve needle component and the bottom end face of the valve needle body is h10; where h10 = h7 + h8 + h9 - h1.

[0017] Furthermore, the connecting plate has an assembly hole on the side away from the nut seat, which communicates with the first internal thread hole. The screw passes through the first internal thread hole and the assembly hole. The electronic expansion valve also includes a limiting plate, which is disposed on the screw and located in the assembly hole. The limiting plate is fixedly connected to the assembly hole.

[0018] Furthermore, the screw and the valve needle body are integrally formed. When the valve needle component is in the extreme position, the screw can no longer move towards the valve port. The end of the valve needle body away from the screw passes through the valve port, and there is a flow gap between the side wall of the end of the valve needle body away from the screw and the valve port.

[0019] Furthermore, the screw and the valve needle body are separately arranged. The valve needle component also includes an elastic part. The extension and retraction direction of the elastic part is the same as the axial direction of the screw. The first end of the elastic part abuts against the end of the screw near the valve port, and the second end of the elastic part abuts against the end of the valve needle body away from the valve port. When the screw can no longer move towards the valve port, the elastic part provides a preload force towards the valve port to the valve needle body.

[0020] Furthermore, the valve needle component also includes: a spring sleeve, which is movably disposed in the end of the nut seat near the valve port. One end of the spring sleeve is movably sleeved on the end of the screw near the elastic part. The other end of the spring sleeve is fixedly connected to the valve needle body. The spring sleeve and the valve needle body are integrally or separately disposed. The elastic part is located inside the spring sleeve. A limiting part is provided on the spring sleeve. The limiting part cooperates with the screw to limit the movement of the screw, so that the screw drives the valve needle body to move away from the valve port through the spring sleeve.

[0021] Furthermore, the end of the spring sleeve away from the valve needle body has a limiting part protruding towards the axis of the spring sleeve, and the end of the screw near the elastic part has a limiting block. The limiting block is used to abut against the limiting part and the elastic part. When the valve needle component moves towards the valve port, the limiting block abuts against the limiting part and the elastic part respectively. After the valve needle body blocks the valve port, the rotor component continues to drive the screw to rotate, the limiting block abuts against the elastic part and compresses the elastic part, and the limiting block separates from the limiting part until the first stop part and the second stop part stop against each other.

[0022] Furthermore, the screw is provided with a stepped structure, which is axially limited to the rotor component; when the first stop surface abuts against the second stop surface, the screw can no longer move towards the valve port. When the first stop surface abuts against the second stop surface, the distance between the stepped structure of the screw and the bottom end face of the valve needle body is h10; the distance between the stepped structure of the screw and the end face of the limiting block near the limiting part is h11; the distance between the end face of the limiting part of the spring sleeve near the limiting block and the upper end face of the valve port is h12; the distance between the end faces of the limiting block and the limiting part that are close to each other is h13; where h10 = h11 + h12 + h9 - h13.

[0023] The present invention also provides an assembly method for an electronic expansion valve, comprising the following steps: Step 1: Screw the valve needle component into the second internal threaded hole of the rotor component and the first internal threaded hole of the nut seat, respectively, until the screw and the rotor component stop and fix each other in the axial direction of the screw; Step 2: Continue to rotate the screw from top to bottom in the first internal threaded hole of the nut seat along the valve closing direction until the valve needle component is at the lower limit position.

[0024] Further, step 1 specifically includes: before installing the valve needle component, fixing the nut seat on the valve seat; screwing the screw of the valve needle component into the second internal thread hole of the rotor component and the first internal thread hole of the nut seat from top to bottom along the direction of closing the valve, until the screw and the rotor component stop each other and are fixed in the axial direction of the screw.

[0025] Further, step 1 specifically includes: screwing the screw of the valve needle component into the first internal thread hole of the nut seat from bottom to top along the valve opening direction until the top end of the screw passes through the upper end of the nut seat; assembling the nut seat onto the valve seat; rotating the rotor component from top to bottom along the valve closing direction onto the screw of the valve needle component through the second internal thread hole of the rotor component until the rotor component and the screw stop each other and are fixed in the axial direction of the screw.

[0026] Furthermore, the screw has a stepped structure, and the rotor component has a stepped surface. The screw and the rotor component mutually stop and fix each other in the axial direction of the screw, specifically including: rotating the screw until the stepped structure of the screw abuts against the stepped surface of the rotor component to limit the relative position of the screw and the rotor component in the axial direction; and fixing the limiting plates to the screw and the rotor component respectively.

[0027] Furthermore, a first stop is provided on the nut seat, and a second stop and a third stop are provided on the rotor component. The second stop and the third stop are spaced apart along the axial direction of the rotor component, and the second stop is located at the end of the third stop away from the valve port of the electronic expansion valve. Step 1 also includes: adjusting the position of the rotor component and the nut seat so that the third stop is located below the first stop and the second stop is located above the first stop.

[0028] Furthermore, the valve needle component being in the lower limit position specifically includes: the first stop part and the second stop part abutting against each other to limit the relative position of the screw and the nut seat in the axial direction.

[0029] By applying the technical solution of this invention, the consistency of flow rate of the valve needle component in the fully closed position can be ensured among individual products in the same batch. It is understood that the first internal threaded hole has a first internal thread segment, the second internal threaded hole has a second internal thread segment, and the screw's mating thread has an external thread segment. Specifically, the starting positions of the first internal thread segment of the nut seat are consistent among individual products in the same batch, the starting positions of the second internal thread segment of the rotor component are consistent among individual products in the same batch, and during the assembly process of the electronic expansion valves in the same batch, after the rotor component and screw of each individual product mutually stop and fix each other in the axial direction of the screw, the relative positions of the screw and the corresponding rotor component are consistent; and when the screw of each individual product rotates to the lower limit position, the relative positions of the screw and the corresponding nut seat are consistent, at which point the valve needle component is in the fully closed position. That is, the above configuration ensures that regardless of the starting point of the external thread segment of the mating thread on the corresponding screw, the consistency of the relative positions of the screw and the nut seat when the screw is in the lower limit position can be guaranteed, thus ensuring the consistency of flow rate when the valve needle component is in the fully closed position. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0031] Figure 1 A cross-sectional view of an electronic expansion valve provided according to Embodiment 1 of the present invention is shown;

[0032] Figure 2 A cross-sectional view of a partial structure of an electronic expansion valve provided according to Embodiment 1 of the present invention is shown;

[0033] Figure 3 A top view of a nut seat provided according to Embodiment 1 of the present invention is shown;

[0034] Figure 4 A bottom view of the rotor connecting sleeve provided according to Embodiment 1 of the present invention is shown;

[0035] Figure 5 A cross-sectional view of a second partial structure of an electronic expansion valve provided according to Embodiment 1 of the present invention is shown;

[0036] Figure 6 A schematic diagram showing the dimensions of a partial structure of a sub-expansion valve according to Embodiment 1 of the present invention is provided.

[0037] Figure 7 A cross-sectional view of an electronic expansion valve provided according to Embodiment 2 of the present invention is shown;

[0038] Figure 8 It shows Figure 7 A partial structural diagram at point A in the middle;

[0039] Figure 9 A cross-sectional view of an electronic expansion valve provided according to Embodiment 3 of the present invention is shown;

[0040] Figure 10 A schematic diagram of a first partial structure of an electronic expansion valve provided according to Embodiment 3 of the present invention is shown;

[0041] Figure 11 A first dimensional schematic diagram of the second partial structure of the electronic expansion valve provided according to Embodiment 3 of the present invention is shown;

[0042] Figure 12 A second dimensional schematic diagram of the second partial structure of the electronic expansion valve provided according to Embodiment 3 of the present invention is shown.

[0043] The above figures include the following reference numerals:

[0044] 10. Valve body; 101. Receiving cavity; 102. Valve port;

[0045] 11. Valve seat; 12. Sleeve;

[0046] 20. Nut seat; 201. First internal threaded hole;

[0047] 30. Valve needle assembly;

[0048] 31. Screw; 3101. Stepped structure; 311. Limiting block;

[0049] 32. Elastic part;

[0050] 33. Valve needle body;

[0051] 34. Spring sleeve; 341. Limiting part;

[0052] 35. Gasket;

[0053] 40. Rotor assembly; 401. Second internal threaded hole;

[0054] 402, Assembly hole; 4021, First hole section; 4022, Second hole section;

[0055] 41. Rotor connecting sleeve; 411. Connecting plate; 412. Annular plate;

[0056] 42. Rotor body;

[0057] 51. First stop portion; 511. First stop surface; 52. Second stop portion; 521. Second stop surface; 53. Third stop portion;

[0058] 60. Limiting plate. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0060] like Figures 1 to 6 As shown, Embodiment 1 of the present invention provides an electronic expansion valve, which includes a valve body 10, a nut seat 20, a valve needle component 30, and a rotor component 40. The valve needle component 30 includes a screw 31 and a valve needle body 33, which can be integrally formed or separately formed. The valve body 10 has a receiving cavity 101 and a valve port 102; the nut seat 20 is disposed in the receiving cavity 101, and the nut seat 20 is provided with a first internal thread hole 201, which has a first internal thread section and is coaxial with the valve port 102. In this embodiment, the valve needle body 33 is disposed at one end of the screw 31 along the axial direction, and the two are integrally formed. The valve needle body 33 is disposed close to the valve port 102, and the valve needle body 33 can adjust the flow rate at the valve port 102. The screw 31 of the valve needle component 30 has an external thread section, and the screw 31 passes through the nut seat 20 through the first internal thread hole 201. The external thread section on the screw 31 and the nut seat 20 are threadedly connected through the first internal thread hole 201. The rotor component 40 is rotatably disposed in the receiving cavity 101 and is located on the side of the nut seat 20 away from the valve port 102. The rotor component 40 is provided with a second internal thread hole 401, and the second internal thread hole 401 has a second internal thread section. The end of the screw 31 away from the valve port 102 passes through the second internal thread hole 401. The external thread section on the screw 31 and the second internal thread hole 401 are threadedly engaged. That is, the rotor component 40 and the screw 31 of the valve needle component 30 are threadedly connected through the second internal thread hole 401. The rotor component 40 and the screw 31 are fixedly connected, and the rotor component 40 and the valve needle component 30 rotate synchronously.

[0061] By applying the technical solution of this invention, the flow rate of the valve needle component 30 in the fully closed position can be ensured among individual products in the same batch. It is understood that the first internal threaded hole 201 has a first internal thread segment, the second internal threaded hole 401 has a second internal thread segment, and the mating thread of the screw 31 has an external thread segment. Specifically, the starting positions of the first internal thread segments of the nut seat 20 are consistent among individual products in the same batch, and the starting positions of the second internal thread segments of the rotor component 40 are consistent among individual products in the same batch. During the assembly of electronic expansion valves in the same batch, after the rotor component 40 and screw 31 of individual products mutually stop and fix each other in the axial direction of the screw 31, the relative positions of the screw 31 and the corresponding rotor component 40 are consistent; and when the screw 31 of individual products rotates to the lower limit position, the relative positions of the screw 31 and the corresponding nut seat 20 are consistent, at which point the valve needle component 30 is in the fully closed position. The above configuration ensures that regardless of the starting point of the external thread section of the mating thread on the screw 31, the relative position of the screw 31 and the corresponding nut seat 20 is consistent when the screw 31 is in the lower limit position, thus ensuring the consistency of the flow rate when the valve needle component 30 is in the fully closed position.

[0062] like Figure 1 As shown in the embodiment of this solution, the valve body 10 includes a valve seat 11 and a sleeve 12 connected to each other, forming a receiving cavity 101 between the valve seat 11 and the sleeve 12, and a valve port 102 is disposed on the valve seat 11. The valve port 102 can be integrally disposed on the valve seat 11, or it can be separately disposed from the valve seat 11 and then fixedly connected; one end of the nut seat 20 is fixedly disposed on the end of the valve seat 11 away from the valve port 102, and the other end of the nut seat 20 is located inside the sleeve 12, and the rotor component 40 is disposed inside the sleeve 12.

[0063] Specifically, the external thread section on the screw 31 is a continuous mating thread, and the first internal thread hole 201 and the second internal thread hole 401 are respectively threaded to the valve needle component 30 through mating threads. This arrangement can improve the convenience of machining the mating threads and ensure the consistency of the flow rate of the valve needle component 30 in the fully closed position among individual products in the same batch of electronic expansion valves.

[0064] like Figure 2 and Figure 3 As shown in the embodiment of this solution, the electronic expansion valve further includes a first stop portion 51 and a second stop portion 52. The first stop portion 51 is disposed on the nut seat 20; the second stop portion 52 is disposed on the rotor component 40; the valve needle component 30 has a limit position. When the valve needle component 30 is in the limit position, the first stop portion 51 and the second stop portion 52 abut against each other, and the valve needle component 30 is in the lower limit position or the upper limit position, that is, the valve needle component 30 cannot continue to move toward the valve port 102 or cannot continue to move away from the valve port 102.

[0065] By setting the first stop part 51 and the second stop part 52, this solution can significantly improve the positioning accuracy of the electronic expansion valve at its limit position, enhance the consistency of flow control at the valve port 102 when the valve needle component 30 is at its limit position, and improve the reliability and performance of the electronic expansion valve. The cooperation of the first stop part 51 and the second stop part 52 can also reduce or avoid the valve needle component 30 from exceeding its design limit position due to external forces during operation, thus protecting the valve needle component 30 and extending the service life of the equipment.

[0066] like Figure 2 and Figure 4 As shown, the electronic expansion valve further includes a third stop portion 53, which is disposed on the rotor component 40 and is located on the side of the second stop portion 52 near the valve port 102.

[0067] Specifically, the limit positions include a lower limit position and an upper limit position. When the valve needle component 30 is in the lower limit position, the first stop part 51 and the second stop part 52 engage, and the valve needle component 30 is in the lower limit position, i.e., the fully closed position, and the valve needle component 30 cannot move further toward the valve port 102. When the valve needle component 30 is in the upper limit position, the first stop part 51 and the third stop part 53 engage, and the valve needle component 30 is in the upper limit position, unable to move further away from the valve port 102, and the valve port 102 has its maximum opening. The arrangement of the first stop part 51, the second stop part 52, and the third stop part 53 limits the movement range of the valve needle component 30, reduces or avoids wear caused by excessive movement of the valve needle component 30, and extends the service life of the electronic expansion valve.

[0068] As the valve needle component 30 moves from the upper limit position to the lower limit position, the direction in which the rotor component 40 drives the valve needle component 30 to rotate is defined as the valve closing direction. As the valve needle component 30 moves from the lower limit position to the upper limit position, the direction in which the rotor component 40 drives the valve needle component 30 to rotate is defined as the valve opening direction.

[0069] Specifically, when the valve needle component 30 is in the lower limit position, the second stop portion 52 and the first stop portion 51 at least partially abut against each other, and the overlapping dimension along the axial direction of the valve needle component 30 is h1.

[0070] Furthermore, the pitch of the mating thread of screw 31 is h, where h1 < h.

[0071] When the valve needle component 30 is in the lower limit position, if the electronic expansion valve switches its operating state, that is, during the process of the valve needle component 30 moving from the lower limit position to the upper limit position, the rotor component 40, the second stop part 52, and the external thread section on the valve needle component 30 rotate synchronously in the valve opening direction. The second stop part 52 and the first stop part 51 gradually separate, and the overlapping part of the second stop part 52 and the first stop part 51 along the axial direction gradually decreases. When the valve needle component 30 rotates one revolution from the lower limit position in the valve opening direction, its axial movement distance away from the valve port 102 is h. If h1 is greater than or equal to h, then after the valve needle component 30 rotates one revolution, the axial overlapping part between the first stop part 51 and the second stop part 52 still exists, and the valve needle component 30 cannot completely disengage from the limit state, which will hinder the normal opening of the electronic expansion valve.

[0072] Setting h1 < h ensures that when the valve needle component 30 is in the lower limit position, if the valve needle component 30 rotates one revolution in the valve opening direction, the first stop part 51 can disengage from the second stop part 52 in the axial direction, and the valve needle component 30 can move in the direction of the upper limit position, thus improving the smoothness of the valve needle component 30 in opening the valve port 102.

[0073] Furthermore, the assembly clearance between the first internal thread segment of the first internal thread hole 201 and the mating thread of the screw 31 in the axial direction of the valve needle component 30 is h2, where h1 > h2.

[0074] When the valve needle component 30 is in the lower limit position, when the refrigerant in the electronic expansion valve impacts the valve needle component 30 along the valve port 102 toward the rotor component 40, due to the assembly gap h2, the valve needle component 30 will move relative to the nut seat 20 axially. At this time, the valve needle component 30 moves away from the valve port 102, and the maximum displacement is h2. After the valve needle component 30 moves away from the valve port 102 from the lower limit position by h2, the second stop part 52 will move synchronously away from the valve port 102 along with the valve needle component 30. If h2 is greater than or equal to h1, the second stop part 52 and the first stop part 51 will disengage from the stop.

[0075] The setting of h1 > h2 ensures that when the valve needle component 30 is in the lower limit position, if the valve needle component 30 moves a distance h2 away from the valve port 102 after being impacted by the refrigerant, the first stop part 51 can still stop the second stop part 52, thus avoiding the failure of the stop.

[0076] It is understandable that the assembly clearance refers to the minimum axial clearance between the first internal thread segment of the first internal thread hole 201 and the mating thread. Under the premise that the assembly clearance exists, the valve needle component 30 can achieve relative rotation with the nut seat 20.

[0077] like Figure 2 As shown in the embodiment of this solution, the rotor component 40 includes a rotor connecting sleeve 41 and a rotor body 42. The rotor connecting sleeve 41 includes a connecting plate 411 and an annular plate 412 connected to each other. The connecting plate 411 is located at the end of the nut seat 20 away from the valve port 102, and a second internal threaded hole 401 is provided on the side of the connecting plate 411 near the nut seat 20. One end of the annular plate 412 is arranged circumferentially at the periphery of the connecting plate 411, and the other end of the annular plate 412 extends toward the valve port 102. The end of the nut seat 20 away from the valve port 102 passes through the annular plate 412. The rotor body 42 and the rotor connecting sleeve 41 are fixedly connected.

[0078] In this embodiment, the second stop 52 and the third stop 53 are disposed inside the rotor connecting sleeve 41. The second stop 52 and the third stop 53 are spaced apart along the axial direction, and the second stop 52 is located at the end of the third stop 53 away from the valve port 102.

[0079] Specifically, the second stop 52 is provided on the side of the connecting plate 411 near the nut seat 20. The third stop 53 is provided on the inner sidewall of the end of the annular plate 412 away from the connecting plate 411. The second stop 52 is a block structure coaxial with the connecting plate 411.

[0080] Furthermore, the second stop 52 and the connecting plate 411 are integrally formed, and the third stop 53 and the annular plate 412 are integrally formed. This configuration ensures the stability of the connection between the second stop 52 and the connecting plate 411, and also ensures the stability of the connection between the third stop 53 and the annular plate 412.

[0081] The first stop portion 51 is provided at one end of the nut seat 20 near the connecting plate 411. Along the axial direction of the nut seat 20, the end face of the first stop portion 51 near the connecting plate 411 protrudes from the end face of the nut seat 20 near the connecting plate 411. The first stop portion 51 is a block structure coaxial with the nut seat 20.

[0082] Specifically, one of the stop surfaces of the first stop portion 51 along the circumference of the nut seat 20 abuts against one of the stop surfaces of the second stop portion 52 along the circumference of the connecting plate 411. Another stop surface of the first stop portion 51 along the circumference of the nut seat 20 abuts against one of the stop surfaces of the third stop portion 53 along the circumference of the annular plate 412.

[0083] Furthermore, the screw 31 and the rotor component 40 are positioned in a limiting fit along the axial direction of the valve needle component 30.

[0084] like Figure 2As shown, further, a mounting hole 402 is provided on the side of the connecting plate 411 away from the nut seat 20. The mounting hole 402 communicates with the second internal thread hole 401, and a stepped surface is formed between the mounting hole 402 and the second internal thread hole 401. The screw 31 passes through the second internal thread hole 401 and the mounting hole 402. The screw 31 has a stepped structure 3101, and the stepped surface abuts against the stepped structure 3101. The abutting fit between the stepped surface and the stepped structure 3101 on the screw 31 ensures the axial positioning of the screw 31 and the connecting plate 411 during the assembly process, avoiding assembly errors caused by over-screwing or under-screwing, thereby ensuring the accuracy and consistency of the electronic expansion valve in the fully closed position. The fit between the stepped structure 3101 and the stepped surface not only limits the axial position but also increases the contact area between the connecting plate 411 and the screw 31, enhancing the stability and reliability of the connection and reducing the risk of loosening due to vibration or external force. Furthermore, the stepped structure 3101 simplifies the assembly process, reduces production costs, and improves production efficiency.

[0085] In this embodiment, the stepped surface is located on the side of the second internal threaded hole 401 away from the nut seat 20, and the cross-sectional area of ​​the mounting hole 402 is larger than the cross-sectional area of ​​the second internal threaded hole 401. When assembling the valve needle component 30 and the rotor component 40, the valve needle body 33 of the valve needle component 30 is passed through the mounting hole 402 and the second internal threaded hole 401 in sequence, and the valve needle component 30 is tightened until the stepped structure 3101 and the stepped surface abut.

[0086] Furthermore, the screw 31 can be circumferentially positioned with the rotor component 40 within the valve needle component 30. This circumferential positioning of the screw 31 and rotor component 40 within the valve needle component 30, combined with the axial positioning, effectively improves the assembly accuracy and reliability of the electronic expansion valve and simplifies the assembly process.

[0087] Specifically, the electronic expansion valve also includes a limiting plate 60, which is disposed on the screw 31 and located within the mounting hole 402. The limiting plate 60 can engage with the mounting hole 402 to prevent rotation and be fixedly connected. The anti-rotation engagement design between the limiting plate 60 and the mounting hole 402 effectively prevents accidental rotation of the screw 31 during assembly or operation, thus effectively preventing rotation of the rotor component 40 and the valve needle component 30 in the circumferential direction.

[0088] Specifically, the wall of the mounting hole 402 has an arc-shaped surface and a straight surface that are interconnected circumferentially. The limiting piece 60 includes an anti-rotation ring, the contour of which is adapted to the contour of the mounting hole 402. When assembling the valve needle component 30 and the rotor component 40, after rotating the screw 31 of the valve needle component 30 into place, the anti-rotation ring is sleeved on the outer circumference of the screw 31 and fixedly connected to the valve needle component 30. With this configuration, the final assembly of the valve needle component 30 and the rotor component 40 can be achieved.

[0089] In this embodiment, when the valve needle component 30 is in the lower limit position, the end of the valve needle body 33 away from the screw 31 passes through the valve port 102, and there is a flow gap between the side wall of the end of the valve needle body 33 away from the screw 31 and the valve port 102. The electronic expansion valve is a fully closed electronic expansion valve with flow.

[0090] When assembling the electronic expansion valve of this embodiment, for electronic expansion valves of the same batch, it is not necessary to perform fixed pulse processing on individual electronic expansion valves of the same batch, so as to ensure the consistency of flow of individual valve components of electronic expansion valves of the same batch.

[0091] Specifically, the threaded segment has a first end and a second end that are arranged opposite to each other along its helical direction. The position of the end of the first end of the threaded segment is defined as the starting point of the threaded segment, and the position of the end of the second end of the threaded segment is defined as the ending point of the threaded segment.

[0092] The threaded segment of the first internal threaded hole 201 is the first internal threaded segment, and the starting point of the first internal threaded segment is located on the end face of the nut seat 20 near the end of the connecting plate 411. The threaded segment of the second internal threaded hole 401 is the second internal threaded segment, and the starting point of the second internal threaded segment is located on the end face of the connecting plate 411 near the end of the nut seat 20.

[0093] like Figures 2 to 6 As shown, the first stop portion 51 further includes a first end face and a second end face arranged opposite each other along the circumference of the nut seat 20. The first end face of the first stop portion 51 is the first stop surface 511. The second stop portion 52 includes a third end face and a fourth end face arranged opposite each other along the circumference of the connecting plate 411. The third end face is the second stop surface 521. When the valve needle component 30 is in the lower limit position, the second stop surface 521 engages with the first stop surface 511.

[0094] like Figure 3 As shown, the end face of the nut seat 20 near the connecting plate 411 is defined as the first reference plane, which is perpendicular to the axis of the nut seat 20. The projection of the axis of the nut seat 20 onto the first reference plane is the first base point O1; the projection of the first stop surface 511 onto the first reference plane is the first line segment, the extension of which passes through the first base point O1, and the first line segment has a point A1; the projection of the starting point of the first internal thread segment onto the first reference plane is point A2; the angle formed by the line connecting the first line segment corresponding to the projection of the first stop surface 511 onto the first reference plane and the first base point O1, and the line connecting the starting point of the first internal thread segment corresponding to the projection of the first internal thread segment onto the first reference plane and the first base point O1 is Q1; that is, Q1 is the angle between the line connecting O1A1 and the line connecting O1A2.

[0095] like Figure 4As shown, the end face of the connecting plate 411 near the nut seat 20 is defined as the second reference plane, which is perpendicular to the axis of the connecting plate 411. The projection of the axis of the connecting plate 411 onto the second reference plane is the second base point O2; the projection of the second stop surface 521 onto the second reference plane is the second line segment, the extension of which passes through the second base point O2, and the second line segment has a point B1; the projection of the starting point of the second internal thread segment onto the second reference plane is point B2; the angle formed by the line connecting the second line segment corresponding to the projection of the second stop surface 521 onto the second reference plane and the second base point O2, and the line connecting the starting point of the second internal thread segment corresponding to the projection of point B2 onto the second reference plane and the second base point O2 is Q2; that is, Q2 is the angle between the line connecting O2B1 and the line connecting O2B2.

[0096] like Figures 2 to 6 As shown, valve port 102 is defined as being located at the bottom of the electronic expansion valve. When valve needle component 30 is in the lower limit position, in the axial direction of valve needle component 30:

[0097] The overlap dimension of the first stop surface 511 and the second stop surface 521 in the axial direction of the valve needle component 30 is h1;

[0098] The distance between the starting point of the second internal thread segment and the starting point of the first internal thread segment is h3, that is, the distance between the end faces of the connecting plate 411 and the nut seat 20 that are close to each other is h3.

[0099] The distance between the starting point of the second internal thread section and the bottom end of the second stop 52 is h4, where h4 is the design dimension, that is, the dimension of the second stop 52 in the axial direction of the connecting plate 411 is h4.

[0100] The distance between the starting point of the first internal thread section and the top of the first stop 51 is h5. h5 is the design dimension, that is, along the axial direction of the nut seat 20, the first stop 51 protrudes from the nut seat 20 towards the connecting plate 411 by a dimension of h5.

[0101] The distance between the stepped surface of the connecting plate 411 and the bottom end of the second stop 52 is h7, where h7 is the design dimension;

[0102] The distance between the top of the first stop 51 and the upper end face of the valve port 102 is h8, where h8 is the design dimension.

[0103] When the valve needle component 30 is in the lower limit position, the valve needle body 33 of the valve needle component 30 passes through the valve port 102. The plane where the end of the valve needle body 33 of the valve needle component 30 away from the screw 31 is located is below the upper end face of the valve port 102. The distance between the upper end face of the valve port 102 and the plane where the end of the valve needle body 33 away from the screw 31 is located is h9.

[0104] The distance between the stepped structure 3101 of the valve needle component 30 and the plane containing the end of the valve needle body 33 away from the screw 31 is h10, where h10 is the design dimension;

[0105] Then, in the same batch of electronic expansion valves, each electronic expansion valve satisfies the following:

[0106] h3=h4+h5-h1, h10=h7+h8+h9-h1;

[0107] h3 / h=n, with a remainder of c, where n is the integer number of turns of the mating thread on the screw 31 between the end face of the connecting plate 411 near the nut seat 20 and the end face of the nut seat 20 near the connecting plate 411 when the valve needle component 30 is in the lower limit position; Q2-Q1=c*360°;

[0108] For electronic expansion valves in the same batch, Q2 and Q1 are both design dimensions, and Q2-Q1 is a fixed value. Therefore, in the same batch of electronic expansion valves, c remains unchanged. This ensures that regardless of the starting and ending positions of the mating thread of the valve needle component 30, after the electronic expansion valve is assembled, when the valve needle component 30 is in the lower limit position, the overlapping dimension h1 of the first stop surface 511 and the second stop surface 521 along the axis of the electronic expansion valve remains unchanged. In the aforementioned formula, h7, h8, and h10 are all product design dimensions. If h1 remains unchanged, then h9 remains unchanged, that is, the distance h9 between the plane of the end of the valve needle body 33 away from the screw 31 and the upper end face of the valve port 102 remains unchanged.

[0109] In other words, the valve needle body 33 of the valve needle component 30 of individual valves in the same batch of electronic expansion valves extends into the valve port 102 to a consistent degree, ensuring the consistency of flow rate when the electronic expansion valves in the same batch are in the fully closed state. This ensures that when the valve needle component 30 of the same batch of electronic expansion valves is moved from the lower limit position (fully closed) to the upper limit position after applying a certain number of pulses, the screw 31 of the valve needle component 30 of each individual valve will rotate the same number of times. That is, the axial movement distance of the valve needle component 30 away from the valve port 102 is consistent, and the change in flow rate is also consistent. Therefore, the consistency of flow rate at the valve port 102 is ensured during the axial movement of the valve needle component 30 of the electronic expansion valve.

[0110] When assembling the electronic expansion valve of this embodiment:

[0111] The nut seat 20 is fixed onto the valve seat 11 beforehand;

[0112] During assembly, ensure that the third stop 53 of the rotor component 40 is located below the first stop 51 of the nut seat 20, and screw the screw 31 of the valve needle component 30 from top to bottom into the connecting plate 411 of the rotor component 40 and the nut seat 20 in the valve closing direction until the stepped surface of the connecting plate 411 abuts against the stepped structure 3101 of the screw 31.

[0113] Install the limiting piece 60 into the assembly hole 402, and weld the limiting piece 60 to the screw 31 and the connecting plate 411 respectively to fix the screw 31 and the connecting plate 411.

[0114] Continue to rotate the valve needle assembly 30 and the rotor assembly 40 as a whole relative to the nut seat 20, that is, continue to screw the valve needle assembly 30 in from top to bottom in the valve closing direction. During this process, the second stop part 52 rotates relative to the first stop part 51 and gradually approaches the first stop part 51 along the axial direction until the stop surfaces of the two parts overlap and abut against each other along the axial direction. At this time, the valve needle assembly 30 is at the lower limit position, and the rotor assembly 40 can no longer continue to rotate in the valve closing direction.

[0115] like Figure 7 and Figure 8 As shown, Embodiment 2 provides an electronic expansion valve, which is a fully closed electronic expansion valve with flow, and differs from Embodiment 1 in that:

[0116] The assembly hole 402 includes a first hole segment 4021 and a second hole segment 4022 that are interconnected. The first hole segment 4021 communicates with the second internal threaded hole 401. The cross-sectional area of ​​the first hole segment 4021 is smaller than that of the second internal threaded hole 401, and the cross-sectional area of ​​the first hole segment 4021 is smaller than that of the second hole segment 4022. A stepped surface is formed between the first hole segment 4021 and the second internal threaded hole 401. The limiting piece 60 cooperates with the second hole segment 4022, and the limiting piece 60 is fixedly connected to the screw 31 and the connecting plate 411 respectively.

[0117] When assembling the electronic expansion valve of this embodiment:

[0118] First, screw the screw 31 into the nut seat 20 from bottom to top in the valve opening direction until the screw 31 passes out from the upper end of the nut seat 20.

[0119] Then the nut seat 20 is assembled onto the valve seat 11;

[0120] When assembling the rotor assembly 40, ensure that when assembling the rotor connecting sleeve 41, the third stop 53 is below the first stop 51 on the nut seat 20;

[0121] Rotor connecting sleeve 41 of rotor component 40 is rotated from top to bottom along the valve closing direction onto screw 31 until the stepped surface of connecting plate 411 abuts against the stepped structure 3101 of screw 31. Rotor component 40 and screw 31 stop and fix each other in the axial direction of screw 31. Limiting plate 60 is assembled into the second hole section 4022 and the limiting plate 60 is welded to screw 31 and connecting plate 411 respectively to fix screw 31 and connecting plate 411.

[0122] Then, the rotor assembly 40 and the valve needle assembly 30 are rotated as a whole relative to the nut seat 20 from top to bottom in the valve closing direction until the second stop surface 521 and the first stop surface 511 abut together and the valve needle assembly 30 is in the lower limit position.

[0123] like Figures 9 to 12 As shown, Embodiment 3 of the present invention provides an electronic expansion valve, which differs from Embodiment 2 in that:

[0124] When the valve needle component 30 is in the lower limit position, the valve needle body 33 of the valve needle component 30 passes through the valve port 102, and the valve needle body 33 of the valve needle component 30 is sealed to the valve port 102. The electronic expansion valve is a fully closed electronic expansion valve with no flow.

[0125] Specifically, the valve needle component 30 includes a screw 31, an elastic part 32, and a valve needle body 33, which are sequentially distributed along the axial direction of the screw 31. The screw 31 and the valve needle body 33 are separately arranged. The screw 31 is connected to the rotor component 40 and the nut seat 20 respectively. The extension and retraction direction of the elastic part 32 is the same as the axial direction of the screw 31. The end of the elastic part 32 near the screw 31 is connected to the end of the screw 31 near the valve port 102. The end of the valve needle body 33 away from the valve port 102 abuts against the end of the elastic part 32 away from the screw 31. The elastic part 32 is used to provide a preload force to the valve needle body 33 in the direction of the valve port 102 when the valve is closed. When the valve needle component 30 is in the lower limit position, the valve needle body 33 is in a sealing fit with the valve port 102.

[0126] Furthermore, the valve needle component 30 also includes a gasket 35, which is disposed between the elastic part 32 and the screw 31, with the ends of the gasket 35 respectively abutting against the screw 31 and the elastic part 32.

[0127] Furthermore, the valve needle component 30 also includes a spring sleeve 34, which is movably inserted into the end of the nut seat 20 near the valve port 102. One end of the spring sleeve 34 is movably sleeved on the end of the screw 31 near the elastic part 32. The other end of the spring sleeve 34 is fixedly connected to the valve needle body 33. The elastic part 32 is located inside the spring sleeve 34. A limiting part 341 is provided on the spring sleeve 34. The limiting part 341 is in a limiting cooperation with the screw 31 so that the screw 31 drives the valve needle body 33 to move away from the valve port 102 through the spring sleeve 34. With this configuration, when the valve needle component 30 closes the valve port 102, the end of the valve needle body 33 away from the elastic part 32 first seals with the valve port 102. At this time, the positions of the valve needle body 33 and the spring sleeve 34 remain unchanged relative to the valve port 102. The first stop part 51 and the second stop part 52 have not yet come into contact. The screw 31 continues to rotate and moves axially in the direction of closing the valve port 102 and compresses the elastic part 32 until the first stop part 51 and the second stop part 52 stop and engage.

[0128] The spring sleeve 34 can be integrally or separately from the valve needle body 33. In this embodiment, the spring sleeve 34 and the valve needle body 33 are separately disposed.

[0129] In this design, the limiting part 341 can be separate from or integrated with the spring sleeve 34.

[0130] In this embodiment, the end of the spring sleeve 34 away from the valve needle body 33 is bent inward to form a limiting part 341. The end of the screw 31 near the elastic part 32 has a limiting block 311, which is located inside the spring sleeve 34 and abuts against the end of the gasket 35 away from the elastic part 32. The limiting block on the screw 31 and the limiting part 341 on the spring sleeve 34 are in a limiting engagement. When the valve needle body 33 has not yet contacted the valve port 102, the limiting block 311 and the limiting part 341 are always in abutting position. When the valve needle body 33 completely blocks the valve port 102, the screw 31 continues to move in the direction of closing the valve port 102. The limiting block 311 on the screw 31 compresses the elastic part 32 through the gasket 35 until the limiting block 311 separates from the limiting part 341, until the first stop part 51 and the second stop part 52 stop engagement.

[0131] In the embodiments of this solution, it is also possible to achieve consistency in flow rate when the valve port 102 of each electronic expansion valve in the same batch is in the closed state.

[0132] like Figures 10 to 12 As shown, valve port 102 is defined as being located at the bottom of the electronic expansion valve. When valve needle component 30 is in the lower limit position, in the axial direction of valve needle component 30:

[0133] The distance between the stepped structure 3101 of the valve needle component 30 and the end face of the limiting block 311 of the screw 31 near the limiting part 341 is h11;

[0134] The distance between the end face of the limiting part 341 of the spring sleeve 34 near the limiting block 311 and the upper end face of the valve port 102 is h12.

[0135] The distance between the end faces of the limiting block 311 and the limiting part 341 that are close to each other is h13. That is, h13 is the distance between the end faces of the limiting block 311 and the limiting part 341 that are close to each other when the first stop part 51 and the second stop part 52 are engaged. In other words, the length of the elastic part 32 that is compressed from when the valve needle body 33 just blocks the valve port 102 until the first stop part 51 and the second stop part 52 are engaged.

[0136] Then, in the same batch of electronic expansion valves, each electronic expansion valve satisfies the following:

[0137] h3=h4+h5-h1, h10=h7+h8+h9-h1=h11+h12+h9-h13;

[0138] In the same batch of electronic expansion valves, when the valve needle body 33 blocks the valve port 102, the distance between the plane of the end of the valve needle body 33 away from the screw 31 and the upper surface of the valve port 102 remains unchanged. That is, in the same batch of electronic expansion valves, the degree to which the valve needle body 33 of each valve extends into the valve port 102 is consistent; simultaneously, from the moment the valve needle body 33 just blocks the valve port 102 until the first stop portion 51 and the second stop portion 52 engage, the elastic portion 32 is compressed, and the length of compression of the elastic portion 32 remains consistent. During the process from the moment the valve needle body 33 just blocks the valve port 102 until the first stop portion 51 and the second stop portion 52 engage, the relative position of the valve needle body 33 and the valve port 102 does not change, ensuring the consistency of flow rate when the electronic expansion valves in the same batch are in the fully closed state.

[0139] When the valve needle assembly 30 is moved from the lower limit position (fully closed) to the upper limit position by applying a certain pulse, the screw 31 rotates in the valve opening direction. Simultaneously, the screw 31 moves away from the valve port 102 along the axial direction. Within a certain number of rotations, the elastic part 32 gradually extends until the limiting block 311 of the screw 31 contacts the limiting part 341 of the spring sleeve 34. The screw 31 continues to move away from the valve port 102 along the axial direction, causing the spring sleeve 34 and the valve needle body 33 to move away from the valve port 102, gradually separating the valve needle body 33 from the valve port 102.

[0140] In the same batch of electronic expansion valves, when the valve needle component 30 is moved to the upper limit position from the lower limit position (i.e., the fully closed position) and the working state is switched, the screw 31 of the valve needle component 30 moves the same distance away from the valve port 102.

[0141] Specifically, when the first pulse number is applied to each individual valve component of the same batch of electronic expansion valves, the distance by which the screw 31 of each individual valve component moves axially away from the valve port 102 is h13, and the elongation of the elastic part 32 is also h13. At this time, the limiting block 311 of the screw 31 abuts against the limiting part 341 of the spring sleeve 34. This first pulse number is the valve opening pulse number. When the same number of pulses is applied to the same batch of electronic expansion valves, in each individual valve component of the same batch of electronic expansion valves, the distance by which the screw 31 drives the spring sleeve 34 and the valve needle body 33 to move away from the valve port 102 is the same. This configuration ensures that, within the same batch of electronic expansion valves, when switching from the state where the second stop part 52 and the first stop part 51 are engaged to the upward limit position of the valve needle component 30, the flow rate change at the valve port 102 of each individual valve is consistent when the same pulse is applied to the same batch of electronic expansion valves. Thus, it ensures the consistency of the flow rate at the valve port 102 during the axial movement of the screw 31 of the valve needle component 30 of the electronic expansion valve away from the valve port 102.

[0142] Embodiment 4 of the present invention also provides an assembly method for an electronic expansion valve, which is used to assemble the electronic expansion valve of Embodiment 1, and specifically includes the following steps:

[0143] Step 1: Screw the screw 31 of the valve needle component 30 into the second internal thread hole 401 of the rotor component 40 and the first internal thread hole 201 of the nut seat 20, respectively, until the screw 31 and the rotor component 40 stop each other and are fixed in the axial direction of the screw 31.

[0144] Step 2: Continue to rotate the screw 31 from top to bottom in the direction of closing the valve within the first internal threaded hole 201 of the nut seat 20 until the valve needle component 30 is in the lower limit position.

[0145] The order in which the screw 31 of the valve needle component 30 is screwed into the second internal threaded hole 401 of the rotor component 40 and into the first internal threaded hole 201 of the nut seat 20 is adjustable.

[0146] In this embodiment of the solution, step 1 specifically includes: before installing the valve needle component 30, fixing the nut seat 20 on the valve seat 11; screwing the screw 31 of the valve needle component 30 into the second internal thread hole 401 of the rotor component 40 and the first internal thread hole 201 of the nut seat 20 in sequence from top to bottom along the direction of closing the valve, until the screw 31 and the rotor component 40 stop each other and are fixed in the axial direction of the screw 31.

[0147] Furthermore, the mutual blocking and fixing of the screw 31 and the rotor component 40 in the axial direction of the screw 31 specifically includes: rotating the screw 31 until the stepped structure of the screw 31 abuts against the stepped surface of the rotor component 40 to limit the relative position of the screw 31 and the rotor component 40 in the axial direction; and fixing the limiting piece 60 to the screw 31 and the rotor component 40 respectively.

[0148] In this embodiment of the solution, step 1 further includes: adjusting the positions of the rotor component 40 and the nut seat 20 so that the third stop 53 is located below the first stop 51 and the second stop 52 is located above the first stop 51.

[0149] Furthermore, the valve needle component 30 being in the lower limit position specifically includes: the first stop portion 51 and the second stop portion 52 abutting against each other to limit the relative position of the screw 31 and the nut seat 20 in the axial direction.

[0150] Embodiment 5 of the present invention also provides an assembly method for an electronic expansion valve, which can be used to assemble the electronic expansion valves of Embodiments 2 and 3. The difference between this method and Embodiment 4 is that step 1 specifically includes: screwing the screw 31 of the valve needle component 30 from bottom to top into the first internal threaded hole 201 of the nut seat 20 along the valve opening direction until the top end of the screw 31 passes through the upper end of the nut seat 20; assembling the nut seat 20 onto the valve seat 11; rotating the rotor component 40 from top to bottom along the valve closing direction onto the screw 31 of the valve needle component 30 through the second internal threaded hole 401 of the rotor component 40 until the rotor component 40 and the screw 31 stop and fix each other in the axial direction of the screw 31.

[0151] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0152] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0153] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0154] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0155] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0156] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electronic expansion valve, characterized in that, include: The valve body (10) has a receiving cavity (101) and a valve port (102); A nut seat (20) is disposed in the receiving cavity (101), and the nut seat (20) is provided with a first internal thread hole (201), which is coaxial with the valve port (102); A valve needle component (30) is disposed in the receiving cavity (101). The valve needle component (30) has a screw (31) and a valve needle body (33) disposed opposite to each other along the axial direction. The valve needle body (33) is disposed close to the valve port (102). The valve needle body (33) can adjust the flow rate at the valve port (102). The screw (31) has a mating thread. The screw (31) is threadedly connected to the first internal threaded hole through the mating thread. The rotor component (40) is rotatably disposed in the receiving cavity (101) and located on the side of the nut seat (20) away from the valve port (102). The rotor component (40) is provided with a second internal thread hole (401). The mating threads on the rotor component (40) and the screw (31) are threadedly connected through the second internal thread hole (401). The rotor component (40) and the screw (31) are fixedly connected.

2. The electronic expansion valve according to claim 1, characterized in that, The mating thread on the screw (31) is a continuous mating thread, and the first internal threaded hole (201) and the second internal threaded hole (401) are respectively threadedly connected to the valve needle component (30) through the mating thread.

3. The electronic expansion valve according to claim 2, characterized in that, The electronic expansion valve also includes: The first stop (51) is provided on the nut seat (20); A second stop (52) is provided on the rotor component (40); The valve needle component (30) has a limit position. When the valve needle component (30) is in the limit position, the first stop surface (511) of the first stop part (51) abuts against the second stop surface (521) of the second stop part (52), and the screw (31) can no longer move toward the valve port (102) or can no longer move away from the valve port (102).

4. The electronic expansion valve according to claim 3, characterized in that, The thread of the first internal threaded hole (201) is the first internal thread segment, and the thread of the second internal threaded hole (401) is the second internal thread segment; The projection of the axis of the first internal threaded hole (201) onto the first reference plane is the first base point O1; the projection of the first stop surface (511) onto the first reference plane is the first line segment; the extension line of the first line segment passes through the first base point O1; the first line segment has a point A1; the projection of the starting point of the first internal thread segment onto the first reference plane is point A2; the angle formed by the line connecting the first line segment and the first base point O1, and the line connecting point A2 and the first base point O1, is Q1; The projection of the axis of the second internal threaded hole (401) onto the second reference plane is the second base point O2; the projection of the second stop surface (521) onto the second reference plane is the second line segment, the extension of the second line segment passes through the second base point O2, and the second line segment has a point B1; the projection of the starting point of the second internal thread segment onto the second reference plane is point B2; the angle formed by the line connecting the second line segment and the second base point O2, and the line connecting point B2 and the second base point O2, is Q2; The difference between Q2 and Q1 is a constant; the first reference plane is perpendicular to the axis of the first internal threaded hole (201), and the second reference plane is perpendicular to the axis of the second internal threaded hole (401).

5. The electronic expansion valve according to claim 3, characterized in that, The electronic expansion valve also includes: A third stop (53) is provided on the rotor component (40), and the third stop (53) is located on the side of the second stop (52) near the valve port (102); The extreme positions include a lower extreme position and an upper extreme position. When the valve needle component (30) is in the lower extreme position, the first stop (51) and the second stop (52) engage in a stop, and the screw (31) can no longer move toward the valve port (102). When the valve needle component (30) is in the upper extreme position, the first stop (51) and the third stop (53) engage in a stop, and the screw (31) can no longer move away from the valve port (102).

6. The electronic expansion valve according to claim 3, characterized in that, When the valve needle component (30) is in the extreme position, the coincidence dimension of the second stop surface (521) and the first stop surface (511) in the axial direction of the valve needle component (30) is h1; The pitch of the mating thread is h, h1 < h; and / or, the assembly clearance between the thread of the first internal threaded hole (201) and the mating thread in the axial direction of the valve needle component (30) is h2, h1 > h2.

7. The electronic expansion valve according to claim 6, characterized in that, The rotor component (40) includes a connecting plate (411) located at the end of the nut seat (20) away from the valve port (102), a second internal threaded hole (401) being provided on the side of the connecting plate (411) near the nut seat (20), a second stop (52) being provided on the side of the connecting plate (411) near the nut seat (20), and a first stop (51) being provided on the outer side wall of the nut seat (20) near the end of the connecting plate (411).

8. The electronic expansion valve according to claim 7, characterized in that, The thread of the first internal threaded hole (201) is the first internal thread segment, and the thread of the second internal threaded hole (401) is the second internal thread segment; The pitch of the mating thread is h; The distance between the starting point of the first internal thread segment and the end of the first stop (51) near the connecting plate (411) is h5; The distance between the starting point of the second internal thread segment and the end of the second stop (52) away from the connecting plate (411) is h4; When the valve needle component (30) is in the extreme position, the distance between the starting point of the first internal thread segment and the starting point of the second internal thread segment in the axial direction of the valve needle component (30) is h3; Where h3 = h4 + h5 - h1; h3 / h = n, with a remainder of c, where n is the integer number of turns of the mating thread on the screw (31) between the starting point of the second internal thread segment and the starting point of the first internal thread segment when the valve needle component (30) is in the extreme position; Q2-Q1 = c*360°.

9. The electronic expansion valve according to claim 7, characterized in that, The screw (31) and the rotor component (40) are in a limiting engagement in the axial direction of the valve needle component (30).

10. The electronic expansion valve according to claim 9, characterized in that, The connecting plate (411) has an assembly hole (402) on the side away from the nut seat (20). The assembly hole (402) communicates with the first internal thread hole (201). A stepped surface is formed between the assembly hole (402) and the first internal thread hole (201). The screw (31) passes through the first internal thread hole (201) and the assembly hole (402). The screw (31) has a stepped structure (3101). The stepped surface abuts against the stepped structure (3101).

11. The electronic expansion valve according to claim 10, characterized in that, The distance between the stepped surface and the bottom end of the second stop (52) is h7; The distance between the top end of the first stop (51) and the upper end face of the valve port (102) is h8; When the valve needle component (30) is in the extreme position, the screw (31) can no longer move toward the valve port (102), the valve needle body (33) passes through the valve port (102), the bottom end face of the valve needle body (33) is located below the upper end face of the valve port (102), the distance between the upper end face of the valve port (102) and the bottom end face of the valve needle body (33) is h9; the distance between the stepped structure (3101) of the valve needle component (30) and the bottom end face of the valve needle body (33) is h10. Where h10 = h7 + h8 + h9 - h1.

12. The electronic expansion valve according to claim 7, characterized in that, The connecting plate (411) has an assembly hole (402) on the side away from the nut seat (20), the assembly hole (402) communicating with the first internal thread hole (201), the screw (31) passing through the first internal thread hole (201) and the assembly hole (402), and the electronic expansion valve further includes: A limiting piece (60) is disposed on the screw (31) and located in the assembly hole (402), and the limiting piece (60) is fixedly connected to the assembly hole (402).

13. The electronic expansion valve according to claim 3, characterized in that, The screw (31) and the valve needle body (33) are integrally formed. When the valve needle component (30) is in the extreme position, the screw (31) can no longer move toward the valve port (102). The end of the valve needle body (33) away from the screw (31) passes through the valve port (102). There is a flow gap between the side wall of the end of the valve needle body (33) away from the screw (31) and the valve port (102).

14. The electronic expansion valve according to claim 3, characterized in that, The screw (31) and the valve needle body (33) are separately disposed, and the valve needle component (30) further includes: The elastic part (32) has the same extension and retraction direction as the axis of the screw (31). The first end of the elastic part (32) abuts against the end of the screw (31) near the valve port (102), and the second end of the elastic part (32) abuts against the end of the valve needle body (33) away from the valve port (102). When the screw (31) can no longer move toward the valve port (102), the elastic part (32) provides a preload force toward the valve port (102) to the valve needle body (33).

15. The electronic expansion valve according to claim 14, characterized in that, The valve needle component (30) also includes: A spring sleeve (34) is movably disposed inside the end of the nut seat (20) near the valve port (102). One end of the spring sleeve (34) is movably sleeved on the end of the screw (31) near the elastic part (32). The other end of the spring sleeve (34) is fixedly connected to the valve needle body (33). The spring sleeve (34) and the valve needle body (33) are integrally or separately disposed. The elastic part (32) is located inside the spring sleeve (34). A limiting part (341) is provided on the spring sleeve (34). The limiting part (341) is in limiting cooperation with the screw (31) so that the screw (31) drives the valve needle body (33) to move away from the valve port (102) through the spring sleeve (34).

16. The electronic expansion valve according to claim 15, characterized in that, The end of the spring sleeve (34) away from the valve needle body (33) has a limiting part (341) protruding toward the axis of the spring sleeve (34), and the end of the screw (31) near the elastic part (32) has a limiting block (311), which is used to abut against the limiting part (341) and the elastic part (32); As the valve needle component (30) moves toward the valve port (102), the limiting block (311) abuts against the limiting part (341) and the elastic part (32) respectively; After the valve needle body (33) blocks the valve port (102), the rotor component (40) continues to drive the screw (31) to rotate. The limiting block (311) abuts against and compresses the elastic part (32). The limiting block (311) separates from the limiting part (341) until the first stop part (51) and the second stop part (52) stop and cooperate.

17. The electronic expansion valve according to claim 16, characterized in that, The screw (31) is provided with a stepped structure (3101), which is axially limited to the rotor component (40); when the first stop surface (511) abuts against the second stop surface (521), the screw (31) can no longer move toward the valve port (102); when the first stop surface (511) abuts against the second stop surface (521); The distance between the stepped structure (3101) of the screw (31) and the bottom end face of the valve needle body (33) is h10; The distance between the stepped structure (3101) of the screw (31) and the end face of the limiting block (311) near the limiting part (341) is h11; The distance between the end face of the limiting part (341) of the spring sleeve (34) near the limiting block (311) and the upper end face of the valve port (102) is h12; The distance between the end faces of the limiting block (311) and the limiting part (341) that are close to each other is h13; Where h10 = h11 + h12 + h9 - h13.

18. A method for assembling an electronic expansion valve, characterized in that, Includes the following steps: Step 1: Screw the screw (31) of the valve needle component (30) into the second internal thread hole (401) of the rotor component (40) and the first internal thread hole (201) of the nut seat (20) respectively, until the screw (31) and the rotor component (40) stop each other and are fixed in the axial direction of the screw (31); Step 2: Continue to rotate the screw (31) from top to bottom in the first internal thread hole (201) of the nut seat (20) along the direction of closing the valve until the valve needle component (30) is in the lower limit position.

19. The assembly method of the electronic expansion valve according to claim 18, characterized in that, Step 1 specifically includes: Before installing the valve needle component (30), the nut seat (20) is fixed on the valve seat (11); The screw (31) of the valve needle component (30) is screwed from top to bottom into the second internal threaded hole (401) of the rotor component (40) and the first internal threaded hole (201) of the nut seat (20) in the direction of closing the valve, until the screw (31) and the rotor component (40) stop each other and are fixed in the axial direction of the screw (31).

20. The assembly method of the electronic expansion valve according to claim 18, characterized in that, Step 1 specifically includes: Screw (31) of valve needle component (30) from bottom to top into the first internal thread hole (201) of nut seat (20) along the valve opening direction until the top of screw (31) passes out from the upper end of nut seat (20); The nut seat (20) is fixed on the valve seat (11); Rotate the rotor component (40) from top to bottom along the valve closing direction through the second internal threaded hole (401) of the rotor component (40) onto the screw (31) of the valve needle component (30) until the rotor component (40) and the screw (31) stop each other and are fixed in the axial direction of the screw (31).

21. The assembly method of the electronic expansion valve according to claim 18, characterized in that, The screw (31) has a stepped structure, and the rotor component (40) has a stepped surface. The screw (31) and the rotor component (40) mutually stop and fix each other in the axial direction of the screw (31), specifically including: The screw (31) is rotated until the stepped structure of the screw (31) abuts against the stepped surface of the rotor component (40) to limit the relative position of the screw (31) and the rotor component (40) in the axial direction; The limiting plate (60) is fixedly connected to the screw (31) and the rotor component (40) respectively.

22. The assembly method of the electronic expansion valve according to claim 18, characterized in that, The nut seat (20) is provided with a first stop (51), and the rotor component (40) is provided with a second stop (52) and a third stop (53). The second stop (52) and the third stop (53) are distributed at intervals along the axial direction of the rotor component (40). The second stop (52) is located at the end of the third stop (53) away from the valve port (102) of the electronic expansion valve. Step 1 further includes: Adjust the positions of the rotor component (40) and the nut seat (20) so that the third stop (53) is located below the first stop (51) and the second stop (52) is located above the first stop (51).

23. The assembly method of the electronic expansion valve according to claim 22, characterized in that, The valve needle component (30) being in the lower limit position specifically includes: The first stop (51) abuts against the second stop (52) to limit the relative position of the screw (31) and the nut seat (20) in the axial direction.

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