Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve body provided with a containing cavity and a valve port. The nut seat is arranged in the containing cavity and provided with a first inner threaded hole, and the first inner threaded hole is coaxial with the valve port; the valve needle component is arranged in the containing cavity and provided with a screw rod and a valve needle body which are oppositely arranged in the axis direction, the valve needle body is arranged close to the valve port and can adjust the flow at the valve port, and the screw rod is provided with a matched thread and is in threaded connection with the first inner threaded hole through the matched thread; the rotor component is rotatably arranged in the containing cavity and located on the side, away from the valve port, of the nut seat, a second inner threaded hole is formed in the rotor component, the rotor component is in threaded connection with the matched threads on the screw through the second inner threaded hole, and the rotor component is fixedly connected with the screw. According to the scheme, the problem that in the prior art, flow of valve needle components of single products of the same batch of electronic expansion valves is inconsistent when the valve needle components are in the fully-closed position can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, specifically, relate to a kind of electronic expansion valve. BACKGROUND

[0002] As the key component for accurately controlling the flow of refrigerant in refrigeration system, the performance of electronic expansion valve directly affects the energy efficiency and stability of refrigeration equipment such as air conditioner and refrigerator. In the electronic expansion valve, the position control of valve needle is the core link to ensure the accuracy of flow regulation.

[0003] The electronic expansion valve usually includes a valve body, a nut seat, a valve needle component and a rotor component. The valve body has a valve cavity and a valve port which are in communication with each other. The nut seat is arranged in the valve cavity. The valve needle component penetrates through the nut seat and is threadedly connected with the nut seat. One end of the valve needle component is used for adjusting the flow at the valve port. The other end of the valve needle component is located at the side of the nut seat away from the valve port. The end of the valve needle component away from the valve port is connected with the rotor component. While the rotor component rotates, the valve needle component moves along the axial direction through the thread connection between the valve needle component and the nut seat, so as to adjust the flow at the valve port.

[0004] In the related art, a smooth mounting port is arranged on the rotor component. The end of the valve needle component away from the valve port is arranged in the mounting port and is fixedly connected with the rotor component. In the process of assembling the electronic expansion valve, the valve needle component is first installed. The valve needle component is threadedly connected with the nut seat. The valve needle component is rotated to be in contact with the valve port. Then, according to the flow requirement, the valve needle component is rotated by a certain angle clockwise or counterclockwise to the required full-closing position. Then, the rotor component is installed. The rotor component and the valve needle are fixedly connected. The process of rotating the angle is a pulse setting process during the installation of the valve needle component. In the related art, the pulse setting process is usually that the valve needle component is manually rotated by a certain angle to the required full-closing position. It is difficult to control the consistency of the rotation angle in the manual pulse setting process between individual valve components in the same batch. Therefore, the flow of the valve needle component in the full-closing position is inconsistent between individual products in the same batch. SUMMARY

[0005] The utility model provides an electronic expansion valve to solve the problem that the flow of the valve needle component in the full-closing position is inconsistent between individual products in the same batch in the prior art.

[0006] The utility model provides a kind of electronic expansion valve, it includes: valve body, with accommodating cavity and valve port;Nut seat, it is set in accommodating cavity, nut seat is provided with first inner thread hole, first inner thread hole is coaxial with valve port;Valve needle component, it is set in accommodating cavity, valve needle component has relatively arranged screw rod and valve needle body along the axial direction, valve needle body is close to valve port setting, valve needle body can adjust the flow at valve port, screw rod has mating thread, screw rod is connected by mating thread and first inner thread hole thread;Rotor component, it is rotatably set in accommodating cavity, and located the side of nut seat away from valve port, rotor component is provided with second inner thread hole, rotor component and mating thread on screw rod are connected by second inner thread hole thread, rotor component and screw rod fixed connection.

[0007] Further, the mating thread on the screw rod is a continuous mating thread, and the first inner thread hole and the second inner thread hole are respectively connected with the valve needle component by the mating thread.

[0008] Further, the electronic expansion valve further comprises: a first stop portion arranged on the nut seat; a second stop portion arranged on the rotor component; the valve needle component has a limit position, when the valve needle component is in the limit position, a first stop surface of the first stop portion abuts against a second stop surface of the second stop portion, and the screw rod cannot move towards the direction of the valve port or cannot move towards the direction away from the valve port.

[0009] Further, the thread of the first inner thread hole is a first inner thread segment, and the thread of the second inner thread hole is a second inner thread segment; the projection of the axis of the first inner thread hole on a first reference plane is a first base point O1, the projection of the first stop surface in the first reference plane is a first line segment, the extension line of the first line segment 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 inner thread segment in the first reference plane is a point A2; the included angle formed by the connecting line of the first line segment and the first base point O1 and the connecting line of the point A2 and the first base point O1 is Q1; the projection of the axis of the second inner thread hole on a second reference plane is a second base point O2; the projection of the second stop surface in the second reference plane is a second line segment, the extension line 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 inner thread segment in the second reference plane is a point B2; the included angle formed by the connecting line of the second line segment and the second base point O2 and the connecting line of the point B2 and the second base point O2 is Q2; wherein, the difference between Q2 and Q1 is a constant value; the first reference plane is perpendicular to the axis of the first inner thread hole, and the second reference plane is perpendicular to the axis of the second inner thread hole.

[0010] Further, the electronic expansion valve further comprises a third stopper arranged on the rotor component, the third stopper being located on the side of the second stopper close to the valve port; the limit position comprises a lower limit position and an upper limit position, when the valve needle component is in the lower limit position, the first stopper and the second stopper are in stop cooperation, and the screw cannot move any more in the direction towards the valve port; when the valve needle component is in the upper limit position, the first stopper and the third stopper are in stop cooperation, and the screw cannot move any more in the direction away from the valve port.

[0011] Further, when the valve needle component is in the limit position, the overlapping size 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

[0012] Further, the rotor component comprises a connecting plate, the connecting plate being located at the end of the nut seat away from the valve port, the second internal threaded hole being arranged on the side of the connecting plate close to the nut seat, the second stopper being arranged on the side of the connecting plate close to the nut seat, and the first stopper being arranged on the outer side wall of the end of the nut seat close to the connecting plate.

[0013] Further, the pitch of the mating thread is h; the distance between the starting point of the first internal threaded section and the end of the first stopper close to the connecting plate is h5; the distance between the starting point of the second internal threaded section and the end of the second stopper away from the connecting plate is h4; when the valve needle component is in the limit position, the distance between the starting point of the first internal threaded section and the starting point of the second internal threaded section in the axial direction of the valve needle component is h3; wherein h3=h4+h5-h1; h3 / h=n, the remainder being c, n being the integer number of turns of the mating thread on the screw between the starting point of the second internal threaded section and the starting point of the first internal threaded section when the valve needle component is in the limit position; Q2-Q1=c*360°.

[0014] Further, the screw and the rotor component are in limit cooperation in the axial direction of the valve needle component.

[0015] Further, the side of the connecting plate away from the nut seat is provided with an assembly hole, the assembly hole being in communication with the first internal threaded hole, a stepped surface being formed between the assembly hole and the first internal threaded hole, the screw penetrating through the first internal threaded hole and the assembly hole, the screw having a stepped structure, and the stepped surface and the stepped structure being in abutting cooperation.

[0016] Further, the interval between the stepped surface and the bottom end of the second stop portion is h7; the interval between the top end of the first stop portion and the upper end surface of the valve port is h8; when the valve needle component is in the limit position, the screw rod cannot move any more in the direction of the valve port, the valve needle body is arranged in the valve port, the bottom end surface of the valve needle body is below the upper end surface of the valve port, the interval between the upper end surface of the valve port and the bottom end surface of the valve needle body is h9; the interval between the stepped structure of the valve needle component and the bottom end surface of the valve needle body is h10; wherein h10 = h7 + h8 + h9 - h1.

[0017] Further, the side of the connecting plate away from the nut seat is provided with an assembly hole, the assembly hole is communicated with the first internal thread hole, the screw rod penetrates through the first internal thread hole and the assembly hole, and the electronic expansion valve further comprises: a limiting sheet arranged on the screw rod and located in the assembly hole, and the limiting sheet is fixedly connected with the assembly hole.

[0018] Further, the screw rod and the valve needle body are integrally arranged, when the valve needle component is in the limit position, the screw rod cannot move any more in the direction of the valve port, the end of the valve needle body away from the screw rod is arranged in the valve port, and the side wall of the end of the valve needle body away from the screw rod has a flow gap with the valve port.

[0019] Further, the screw rod and the valve needle body are separately arranged, and the valve needle component further comprises: an elastic portion, the extension direction of the elastic portion is the same as the axis direction of the screw rod, the first end of the elastic portion is in abutment with the end of the screw rod close to the valve port, the second end of the elastic portion is in abutment with the end of the valve needle body away from the valve port, and when the screw rod cannot move any more in the direction of the valve port, the elastic portion provides a pre-tightening force in the direction of the valve port to the valve needle body.

[0020] Further, the valve needle component further comprises: a spring sleeve movably arranged in the end of the nut seat close to the valve port, one end of the spring sleeve movably sleeved with the end of the screw rod close to the elastic portion, and the other end of the spring sleeve and the valve needle body are fixedly connected; the spring sleeve and the valve needle body are integrally arranged or separately arranged, the elastic portion is located in the spring sleeve, a limiting portion is arranged on the spring sleeve, the limiting portion is in limiting cooperation with the screw rod, so that the screw rod drives the valve needle body to move in the direction away from the valve port through the spring sleeve.

[0021] Further, the end of the spring sleeve away from the valve needle body has a limiting portion protruding in the direction of the axis of the spring sleeve, the end of the screw rod close to the elastic portion has a limiting block, the limiting block is used for abutting cooperation with the limiting portion and the elastic portion; during the movement of the valve needle component in the direction of the valve port, the limiting block is in abutting cooperation with the limiting portion and the elastic portion respectively; after the valve needle body blocks the valve port, the rotor component continues to drive the screw rod to rotate, the limiting block is in abutting cooperation with the elastic portion and compresses the elastic portion, the limiting block is separated from the limiting portion, and until the first stop portion and the second stop portion are in stop cooperation.

[0022] Further, the screw rod is provided with a stepped structure which is in axial limiting cooperation with the rotor component; when the first stop surface and the second stop surface abut, the screw rod cannot move any more towards the direction of the valve port; when the first stop surface and the second stop surface abut, the distance between the stepped structure of the screw rod and the bottom end surface of the valve needle body is h10; the distance between the stepped structure of the screw rod and the end surface of the limiting block close to the limiting portion is h11; the distance between the end surface of the limiting portion of the spring sleeve close to the limiting block and the upper end surface of the valve port is h12; the distance between the end surfaces of the limiting block and the limiting portion close to each other is h13; wherein h10 = h11 + h12 + h9 - h13.

[0023] The technical scheme of the utility model can ensure the consistency of the flow of the valve needle components between single products in the same batch at the full-closing position. It can be understood that the first internal thread hole has a first internal thread section, the second internal thread hole has a second internal thread section, and the matching thread of the screw rod has an external thread section. Specifically, the starting positions of the first internal thread sections of the nut seats between single products in the same batch are consistent, the starting positions of the second internal thread sections of the rotor components between single products in the same batch are consistent, and during the assembly of the electronic expansion valve in the same batch, the rotor components and the screw rod between single products abut and are fixed in the axial direction of the screw rod, and the relative positions of the screw rod and the corresponding rotor component have consistency; and when the screw rod between single products rotates to the lower limit position, the relative positions of the screw rod and the corresponding nut seat have consistency, and at this time, the valve needle component is at the full-closing position. That is, the above-mentioned arrangement can ensure the consistency of the relative positions of the screw rod and the nut seat when the external thread section of the matching thread on the corresponding screw rod is at any starting position, that is, ensure the consistency of the flow of the valve needle component when the valve needle component is at the full-closing position. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the present application, serve to explain the present application. In the drawings:

[0025] Figure 1 A cross-sectional view of an electronic expansion valve according to the embodiment one of the present application is shown;

[0026] Figure 2 A cross-sectional view of a partial structure of an electronic expansion valve according to the embodiment one of the present application is shown;

[0027] Figure 3 A top view of a nut seat according to the embodiment one of the present application is shown;

[0028] Figure 4 A bottom view of a rotor connecting sleeve according to the embodiment one of the present application is shown.

[0029] Figure 5 A cross-sectional view of a second partial structure of the electronic expansion valve is shown according to the embodiment one of the present application;

[0030] Figure 6 A size structure schematic view of a partial structure of the electronic expansion valve is shown according to the embodiment one of the present application;

[0031] Figure 7 A cross-sectional view of the electronic expansion valve is shown according to the embodiment two of the present application;

[0032] Figure 8 A cross-sectional view of the electronic expansion valve is shown Figure 7 A partial structure schematic view at A;

[0033] Figure 9 A cross-sectional view of the electronic expansion valve is shown according to the embodiment three of the present application;

[0034] Figure 10 A first partial structure schematic view of the electronic expansion valve is shown according to the embodiment three of the present application;

[0035] Figure 11 A first size schematic view of a second partial structure of the electronic expansion valve is shown according to the embodiment three of the present application;

[0036] Figure 12 A second size schematic view of a second partial structure of the electronic expansion valve is shown according to the embodiment three of the present application.

[0037] Among them, the above-mentioned drawings include the following figure marks:

[0038] 10, valve body; 101, accommodating cavity; 102, valve port;

[0039] 11, valve seat; 12, sleeve;

[0040] 20, nut seat; 201, first internal thread hole;

[0041] 30, valve needle component;

[0042] 31, screw rod; 3101, stepped structure; 311, limiting block;

[0043] 32, elastic part;

[0044] 33, valve needle body;

[0045] 34, spring sleeve; 341, limiting part;

[0046] 35, gasket;

[0047] 40, rotor part; 401, second inner threaded hole;

[0048] 402, assembling hole; 4021, first hole section; 4022, second hole section;

[0049] 41, rotor connecting sleeve; 411, connecting plate; 412, annular plate;

[0050] 42, rotor body;

[0051] 51, first stop part; 511, first stop surface; 52, second stop part; 521, second stop surface; 53, third stop part;

[0052] 60, limiting sheet. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but by no means as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the present application.

[0054] As Figures 1 to 6The utility model discloses an electronic expansion valve, which comprises a valve body 10, a nut seat 20, a valve needle component 30 and a rotor component 40. The valve needle component 30 comprises a screw rod 31 and a valve needle body 33, which can be provided in an integrated structure or in a split structure. The valve body 10 has a receiving cavity 101 and a valve port 102. The nut seat 20 is arranged in the receiving cavity 101. The nut seat 20 is provided with a first internal thread hole 201 having a first internal thread section. The first internal thread hole 201 is coaxial with the valve port 102. In the embodiment of the present scheme, the valve needle body 33 is arranged at one end of the screw rod 31 in the axial direction of the screw rod 31. The valve needle body 33 is arranged close to the valve port 102 and can adjust the flow rate at the valve port 102. The screw rod 31 of the valve needle component 30 has an external thread section. The screw rod 31 penetrates the nut seat 20 through the first internal thread hole 201. The external thread section of the screw rod 31 and the nut seat 20 are threadedly connected through the first internal thread hole 201. The rotor component 40 is rotatably arranged in the receiving cavity 101 and located at 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 having a second internal thread section. The screw rod 31 penetrates the second internal thread hole 401 at the end away from the valve port 102. The external thread section of the screw rod 31 and the second internal thread hole 401 are threadedly matched. That is, the rotor component 40 and the screw rod 31 of the valve needle component 30 are threadedly connected through the second internal thread hole 401. The rotor component 40 and the screw rod 31 are fixedly connected. The rotor component 40 and the valve needle component 30 rotate synchronously.

[0055] The technical scheme of the utility model can ensure the consistency of the flow rate of the valve needle component 30 in the full-closing position between single products in the same batch. It can be understood that the first internal thread hole 201 has a first internal thread section, the second internal thread hole 401 has a second internal thread section, and the matching thread of the screw rod 31 has an external thread section. Specifically, the starting positions of the first internal thread sections of the nut seats 20 between single products in the same batch are consistent. The starting positions of the second internal thread sections of the rotor components 40 between single products in the same batch are consistent. During the assembly of the electronic expansion valve in the same batch, the rotor component 40 and the screw rod 31 of single products are mutually stopped and fixed in the axial direction of the screw rod 31. The relative positions of the screw rod 31 and the corresponding rotor component 40 have consistency. When the screw rod 31 of single products is rotated to the lower limit position, the relative positions of the screw rod 31 and the corresponding nut seat 20 have consistency. At this time, the valve needle component 30 is in the full-closing position. That is, the above-mentioned arrangement can ensure the consistency of the relative positions of the screw rod 31 and the corresponding nut seat 20 when the external thread section of the matching thread of the screw rod 31 is at any starting position. That is, the consistency of the flow rate of the valve needle component 30 in the full-closing position is ensured.

[0056] As Figure 1As shown, in the embodiment of the present scheme, the valve body 10 comprises a valve seat 11 and a sleeve 12 connected with each other, a containing cavity 101 is formed between the valve seat 11 and the sleeve 12, and a valve port 102 is arranged on the valve seat 11. The valve port 102 can be integrally arranged on the valve seat 11 or can be arranged separately from the valve seat 11 and then fixedly connected; one end of a nut seat 20 is fixedly arranged at an end of the valve seat 11 away from the valve port 102, the other end of the nut seat 20 is located in the sleeve 12, and a rotor component 40 is arranged in the sleeve 12.

[0057] Specifically, the outer thread section on the screw rod 31 is a continuous mating thread, and the first inner thread hole 201 and the second inner thread hole 401 are respectively threadedly connected with the valve needle component 30 through the mating thread. In this way, the convenience of machining the mating thread can be improved, and the consistency of the flow of the valve needle component 30 in the full-closed position among single products in the same batch of electronic expansion valves can be ensured.

[0058] As shown in Figure 2 and Figure 3 In the embodiment of the present scheme, the electronic expansion valve further comprises a first stop portion 51 and a second stop portion 52. The first stop portion 51 is arranged on the nut seat 20; the second stop portion 52 is arranged 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 abuts against the second stop portion 52, and the valve needle component 30 is in a lower limit position or an upper limit position, i.e., the valve needle component 30 cannot continue to move towards the valve port 102 or cannot continue to move away from the valve port 102.

[0059] By arranging the first stop portion 51 and the second stop portion 52, the present scheme can significantly improve the positioning accuracy of the electronic expansion valve in the limit position, improve the consistency of the flow control at the valve port 102 when the valve needle component 30 is in the limit position, and improve the reliability and working performance of the electronic expansion valve. The cooperation of the first stop portion 51 and the second stop portion 52 can also reduce or avoid the situation that the valve needle component 30 exceeds its designed limit position due to external force during operation, which protects the valve needle component 30 and prolongs the service life of the equipment.

[0060] As shown in Figure 2 and Figure 4 Further, the electronic expansion valve further comprises a third stop portion 53, the third stop portion 53 is arranged on the rotor component 40, and the third stop portion 53 is located on the side of the second stop portion 52 close to the valve port 102.

[0061] 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 portion 51 and the second stop portion 52 are in stop cooperation, the valve needle component 30 is in the lower limit position, i.e., a full-closed position, and the valve needle component 30 cannot continue to move towards the valve port 102. When the valve needle component 30 is in the upper limit position, the first stop portion 51 and the third stop portion 53 are in stop cooperation, the valve needle component 30 is in the upper limit position, and cannot continue to move away from the valve port 102, and the valve port 102 has the maximum opening degree. The arrangement of the first stop portion 51, the second stop portion 52 and the third stop portion 53 limits the movement range of the valve needle component 30, reduces or avoids the wear caused by excessive movement of the valve needle component 30, and prolongs the service life of the electronic expansion valve.

[0062] During the movement of the valve needle component 30 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 the closing direction, and during the movement of the valve needle component 30 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 the opening direction.

[0063] 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, and the overlapping dimension of the second stop portion 52 and the first stop portion 51 along the axial direction of the valve needle component 30 is h1.

[0064] Further, the pitch of the mating thread of the screw rod 31 is h, and h1 < h.

[0065] When the valve needle component 30 is in the lower limit position, if the electronic expansion valve switches the working state, i.e., during the movement of the valve needle component 30 from the lower limit position to the upper limit position, the rotor component 40, the second stop portion 52 and the external thread segment on the valve needle component 30 synchronously rotate in the opening direction. The second stop portion 52 and the first stop portion 51 gradually separate, and the overlapping part of the second stop portion 52 and the first stop portion 51 along the axial direction gradually decreases. When the valve needle component 30 rotates one circle from the lower limit position in the opening direction, the movement distance of the valve needle component 30 in the axial direction 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 circle, the axial overlapping part between the first stop portion 51 and the second stop portion 52 still exists, and the valve needle component 30 cannot completely escape from the limiting state, which will hinder the normal opening of the electronic expansion valve.

[0066] The arrangement of h1 < h can ensure that when the valve needle component 30 is in the lower limit position, if the valve needle component 30 rotates one circle in the opening direction, the first stop portion 51 can axially separate from the second stop portion 52, and the valve needle component 30 can move towards the upper limit position, thereby improving the smoothness of the valve needle component 30 to open the valve port 102.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] like Figure 2 As 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.

[0079] In the embodiment, the stepped surface is located on the side of the second inner threaded hole 401 away from the nut seat 20, and the cross-sectional area of the assembly hole 402 is greater than that of the second inner 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 sequentially inserted through the assembly hole 402 and the second inner threaded hole 401, and the valve needle component 30 is screwed until the stepped structure 3101 and the stepped surface abut.

[0080] Further, the screw rod 31 can be limited in the circumferential direction of the valve needle component 30 together with the rotor component 40. The screw rod 31 is limited in the circumferential direction of the valve needle component 30 together with the rotor component 40, which, in combination with the axial limitation, effectively improves the assembly accuracy and reliability of the electronic expansion valve and simplifies the assembly process.

[0081] Specifically, the electronic expansion valve further comprises a limiting sheet 60, which is arranged on the screw rod 31 and located in the assembly hole 402, and the limiting sheet 60 is fixedly connected with the assembly hole 402 in a rotation-stopping manner. The rotation-stopping design of the limiting sheet 60 and the assembly hole 402 effectively prevents the screw rod 31 from rotating accidentally during the assembly process or in the running state, so that the rotor component 40 and the valve needle component 30 are effectively rotation-stopped in the circumferential direction.

[0082] Specifically, the hole wall of the assembly hole 402 has an arc surface and a flat surface connected with each other in the circumferential direction, and the limiting sheet 60 comprises a rotation-stopping ring, the contour of which is adapted to that of the assembly hole 402. When assembling the valve needle component 30 and the rotor component 40, the rotation-stopping ring is sleeved on the outer periphery of the screw rod 31 after the screw rod 31 of the valve needle component 30 is rotated into position, and is fixedly connected with the valve needle component 30. In this way, the final assembly of the valve needle component 30 and the rotor component 40 can be realized.

[0083] 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 rod 31 is inserted into the valve port 102, and the side wall of the end of the valve needle body 33 away from the screw rod 31 has a flow gap with the valve port 102, so that the electronic expansion valve is a full-closed flow electronic expansion valve.

[0084] When assembling the electronic expansion valve of this embodiment, for the same batch of electronic expansion valves, it is not necessary to perform pulse setting on individual electronic expansion valves of the same batch, so that the flow consistency of individual valve components of the same batch of electronic expansion valves can be ensured.

[0085] Specifically, the threaded segment has a first end and a second end oppositely arranged along the helical direction thereof. 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 terminal point of the threaded segment.

[0086] The threaded section of the first inner threaded hole 201 is a first inner threaded section, and the starting point of the first inner threaded section is located on the end face of the nut seat 20 close to one end of the connecting plate 411. The threaded section of the second inner threaded hole 401 is a second inner threaded section, and the starting point of the second inner threaded section is located on the end face of the connecting plate 411 close to one end of the nut seat 20.

[0087] As shown in Figures 2 to 6 Further, the first stop portion 51 has a first end face and a second end face oppositely arranged along the circumference of the nut seat 20, and the first end face of the first stop portion 51 is a first stop face 511. The second stop portion 52 has a third end face and a fourth end face oppositely arranged along the circumference of the connecting plate 411, and the third end face is a second stop face 521. When the valve needle member 30 is in the lower limit position, the second stop face 521 is in stop cooperation with the first stop face 511.

[0088] As shown in Figure 3 The end face of the nut seat 20 close to the connecting plate 411 is defined as a first reference plane, and the first reference plane is perpendicular to the axis of the nut seat 20. The projection of the axis of the nut seat 20 on the first reference plane is a first base point O1; the projection of the first stop face 511 in the first reference plane is a first line segment, and the extension line of the first line segment 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 inner threaded section in the first reference plane is a point A2; the line connecting the corresponding first line segment of the projection of the first stop face 511 on the first reference plane and the first base point O1, and the line connecting the corresponding point A2 of the projection of the starting point of the first inner threaded section on the first reference plane and the first base point O1 form an angle Q1; that is, Q1 is the angle between the line Q1A1 and the line Q1A2.

[0089] As shown in Figure 4 The end face of the connecting plate 411 close to the nut seat 20 is defined as a second reference plane, and the second reference plane is perpendicular to the axis of the connecting plate 411. The projection of the axis of the connecting plate 411 on the second reference plane is a second base point O2; the projection of the second stop face 521 in the second reference plane is a second line segment, and the extension line 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 inner threaded section in the second reference plane is a point B2; the line connecting the corresponding second line segment of the projection of the second stop face 521 on the second reference plane and the second base point O2, and the line connecting the corresponding point B2 of the projection of the starting point of the second inner threaded section on the second reference plane and the second base point O2 form an angle Q2; that is, Q2 is the angle between the line O2B1 and the line O2B2.

[0090] As shown in Figures 2 to 6 The valve port 102 is located at the bottom end of the electronic expansion valve, and when the valve needle member 30 is in the lower limit position, in the axial direction of the valve needle member 30:

[0091] The coinciding 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;

[0092] 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 face of the connecting plate 411 close to the nut seat 20 and the end face of the nut seat 20 close to the connecting plate 411 is h3;

[0093] The distance between the starting point of the second internal thread segment and the bottom end of the second stop portion 52 is h4, h4 is a design dimension, that is, the dimension of the second stop portion 52 in the axial direction of the connecting plate 411 is h4;

[0094] The distance between the starting point of the first internal thread segment and the top end of the first stop portion 51 is h5, h5 is a design dimension, that is, the dimension of the first stop portion 51 protruding from the nut seat 20 in the direction close to the connecting plate 411 along the axial direction of the nut seat 20 is h5;

[0095] The distance between the stepped surface of the connecting plate 411 and the bottom end of the second stop portion 52 is h7, h7 is a design dimension;

[0096] The distance between the top end of the first stop portion 51 and the upper end face of the valve port 102 is h8, h8 is a design dimension;

[0097] When the valve needle component 30 is in the lower limit position, the valve needle body 33 of the valve needle component 30 is arranged in the valve port 102, the plane where the end of the valve needle body 33 away from the screw rod 31 is located is below the upper end face of the valve port 102, and 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 rod 31 is located is h9;

[0098] The distance between the stepped structure 3101 of the valve needle component 30 and the plane where the end of the valve needle body 33 away from the screw rod 31 is located is h10, h10 is a design dimension;

[0099] Then, each electronic expansion valve in the same batch satisfies:

[0100] h3=h4+h5-h1, h10=h7+h8+h9-h1;

[0101] h3 / h=n, the remainder is c, n is the integer number of turns of the matching thread on the screw rod 31 between the end face of the connecting plate 411 close to the nut seat 20 and the end face of the nut seat 20 close to the connecting plate 411 when the valve needle component 30 is in the lower limit position; Q2-Q1=c*360°;

[0102] The Q2 and Q1 of the electronic expansion valve in the same batch are design sizes, and the Q2-Q1 is a constant value. In the electronic expansion valve in the same batch, the c remains unchanged, so that no matter where the starting point and the ending point of the mating threads of the valve needle component 30 are located, the coincidence size h1 of the first stop surface 511 and the second stop surface 521 of each electronic expansion valve in the same batch along the electronic expansion valve axis direction remains unchanged when the valve needle component 30 is in the lower limit position. In the foregoing formula, h7, h8, and h10 are product design sizes, h1 is unchanged, h9 is unchanged, that is, the distance h9 between the plane where the valve needle body 33 of the valve needle component 30 of the single valve part of the electronic expansion valve in the same batch extends into the valve port 102 and the upper end surface of the valve port 102 is unchanged.

[0103] That is, the degree to which the valve needle body 33 of the valve needle component 30 of the single valve part of the electronic expansion valve in the same batch extends into the valve port 102 is consistent, which ensures the consistency of the flow rate of the electronic expansion valve in the same batch in the full-closed state. When the valve needle component 30 of the electronic expansion valve in the same batch moves from the lower limit position, that is, the full-closed position, to the upper limit position, the screw rod 31 of the valve needle component 30 of the single valve part can rotate the same number of turns under the condition that the same number of pulses are applied to the single valve part from the full-closed position, that is, the moving distance of the valve needle component 30 along the axial direction away from the valve port 102 is consistent, and the change value of the flow rate is also consistent. Therefore, the consistency of the flow rate at the valve port 102 during the axial movement of the valve needle component 30 of the electronic expansion valve is ensured.

[0104] When the electronic expansion valve of the present embodiment is assembled:

[0105] The nut seat 20 is fixed on the valve seat 11 in advance;

[0106] During assembly, the third stop portion 53 of the rotor component 40 is located below the first stop portion 51 of the nut seat 20, the screw rod 31 of the valve needle component 30 is screwed into the connecting plate 411 of the rotor component 40 and the nut seat 20 from top to bottom along the valve closing direction, and the stepped surface of the connecting plate 411 and the stepped structure 3101 of the screw rod 31 are abutted and matched;

[0107] The limiting sheet 60 is installed into the assembly hole 402, and the limiting sheet 60 is welded with the screw rod 31 and the connecting plate 411, respectively, to fix the screw rod 31 and the connecting plate 411;

[0108] Continuing to rotate the valve needle component 30 and the rotor component 40 as a whole relative to the nut seat 20, i.e. continuing to screw the valve needle component 30 in the valve closing direction from top to bottom, in the process, the second stop portion 52 rotates relative to the first stop portion 51 and gradually approaches the first stop portion 51 in the axial direction until the stop surfaces of the two at least partially coincide and abut in the axial direction, at this time, the valve needle component 30 is in the lower limit position, and the rotor component 40 cannot continue to rotate in the valve closing direction.

[0109] As shown in Figure 7 and Figure 8 Embodiment two provides an electronic expansion valve, which is a full-closing electronic expansion valve, and differs from embodiment one in that:

[0110] The assembly hole 402 includes a first hole section 4021 and a second hole section 4022 in communication with each other, the first hole section 4021 communicates with the second internal threaded hole 401, the cross-sectional area of the first hole section 4021 is smaller than that of the second internal threaded hole 401, and the cross-sectional area of the first hole section 4021 is smaller than that of the second hole section 4022. A stepped surface is formed between the first hole section 4021 and the second internal threaded hole 401, and the limiting sheet 60 cooperates with the second hole section 4022, and the limiting sheet 60 is fixedly connected with the screw rod 31 and the connecting plate 411, respectively.

[0111] When assembling the electronic expansion valve of the embodiment:

[0112] First, screw the screw rod 31 into the nut seat 20 from bottom to top in the valve opening direction until the screw rod 31 passes out of the upper end of the nut seat 20;

[0113] Then, assemble the nut seat 20 to the valve seat 11;

[0114] Assemble the rotor component 40, and ensure that when the rotor connecting sleeve 41 is assembled, the third stop portion 53 is below the first stop portion 51 on the nut seat 20;

[0115] Rotate the rotor connecting sleeve 41 of the rotor component 40 onto the screw rod 31 from top to bottom in the valve closing direction until the stepped surface of the connecting plate 411 abuts and cooperates with the stepped structure 3101 of the screw rod 31, and the rotor component 40 and the screw rod 31 abut and fix each other in the axial direction of the screw rod 31, assemble the limiting sheet 60 into the second hole section 4022, and weld the limiting sheet 60 with the screw rod 31 and the connecting plate 411, respectively, to fix the screw rod 31 and the connecting plate 411;

[0116] Then, continue to rotate the rotor component 40 and the valve needle component 30 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, and the valve needle component 30 is in the lower limit position.

[0117] As Figures 9 to 12 shown in the utility model embodiment three provides an electronic expansion valve, with the difference of embodiment two is:

[0118] When the valve needle component 30 is in the lower limit position, the valve needle body 33 of the valve needle component 30 is arranged in the valve port 102, and the valve needle body 33 of the valve needle component 30 is in sealing cooperation with the valve port 102, and the electronic expansion valve is a full-closed no-flow electronic expansion valve.

[0119] Specifically, the valve needle component 30 includes the screw rod 31, the elastic part 32 and the valve needle body 33 sequentially distributed along the axial direction of the screw rod 31, and the screw rod 31 and the valve needle body 33 are separately arranged. Wherein, the screw rod 31 is connected with the rotor component 40 and the nut seat 20 respectively;The elastic part 32 is connected with the screw rod 31 at one end close to the screw rod 31, and the elastic part 32 is connected with the screw rod 31 at one end close to the valve port 102;The end of the valve needle body 33 away from the valve port 102 is in abutment with the end of the elastic part 32 away from the screw rod 31, and the elastic part 32 is used to provide the valve needle body 33 with pre-tightening force in the direction of the valve port 102 when closing the valve;When the valve needle component 30 is in the lower limit position, the valve needle body 33 is in sealing cooperation with the valve port 102.

[0120] Further, the valve needle component 30 further includes a gasket 35, which is arranged between the elastic part 32 and the screw rod 31, and the gasket 35 is in abutment with the end of the screw rod 31 and the elastic part 32 close to each other.

[0121] Further, the valve needle component 30 further includes a spring sleeve 34, which is movably arranged in the end of the nut seat 20 close to the valve port 102, and the spring sleeve 34 is movably sleeved on the end of the screw rod 31 close to the elastic part 32, and the other end of the spring sleeve 34 is fixedly connected with the valve needle body 33, and the elastic part 32 is located in the spring sleeve 34, and the spring sleeve 34 is provided with a limiting portion 341, and the limiting portion 341 is in limiting cooperation with the screw rod 31, so that the screw rod 31 drives the valve needle body 33 to move away from the valve port 102 through the spring sleeve 34. By such arrangement, 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 is first in sealing cooperation with the valve port 102, at this time, the position of the valve needle body 33 and the spring sleeve 34 remains unchanged relative to the valve port 102, the first stop portion 51 and the second stop portion 52 have not been contacted, the screw rod 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 portion 51 and the second stop portion 52 are in stop cooperation.

[0122] Wherein, the spring sleeve 34 can be integrally or separately arranged with the valve needle body 33. In the embodiment of the present scheme, the spring sleeve 34 is separately arranged with the valve needle body 33.

[0123] In this design, the limiting part 341 can be separate from or integrated with the spring sleeve 34.

[0124] 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.

[0125] 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.

[0126] 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:

[0127] 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;

[0128] 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.

[0129] 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.

[0130] Then, in the same batch of electronic expansion valves, each electronic expansion valve satisfies the following:

[0131] h3=h4+h5-h1, h10=h7+h8+h9-h1=h11+h12+h9-h13;

[0132] In the same batch of electronic expansion valves, the distance between the plane where the end of the valve needle body 33 away from the screw rod 31 is located and the upper end surface of the valve port 102 is constant when the valve needle body 33 blocks the valve port 102. That is, in the same batch of electronic expansion valves, the degree to which the valve needle body 33 of a single valve part extends into the valve port 102 is consistent; at the same time, the length of the elastic part 32 that is compressed is consistent when the valve needle body 33 just blocks the valve port 102 to the stop cooperation of the first stop part 51 and the second stop part 52. During the process from when the valve needle body 33 just blocks the valve port 102 to the stop cooperation of the first stop part 51 and the second stop part 52, the relative position of the valve needle body 33 and the valve port 102 does not change, which ensures the consistency of the flow rate of the same batch of electronic expansion valves in the full-closed state.

[0133] When the valve needle part 30 is applied with a certain pulse from the lower limit position, i.e., the full-closed position, and switches the working state to move to the upper limit position, the screw rod 31 rotates in the opening direction, and at the same time, moves in the axial direction away from the valve port 102. Within a certain number of rotations of the screw rod 31, the elastic part 32 gradually elongates until the limiting block 311 of the screw rod 31 contacts the limiting part 341 of the spring sleeve 34; the screw rod 31 continues to move in the axial direction away from the valve port 102, and the screw rod 31 drives the spring sleeve 34 and the valve needle body 33 to move away from the valve port 102, and the valve needle body 33 gradually separates from the valve port 102.

[0134] In the same batch of electronic expansion valves, when the valve needle part 30 is applied with the same pulse from the lower limit position, i.e., the full-closed position, and switches the working state to move to the upper limit position, the distance that the screw rod 31 of the valve needle part 30 moves away from the valve port 102 is consistent.

[0135] Specifically, when the same number of pulses is applied to the single valve part of the same batch of electronic expansion valves, the distance that the screw rod 31 of the single valve part moves away from the valve port 102 in the axial direction is h13, and the elongation of the elastic part 32 is also h13, at this time, the limiting block 311 of the screw rod 31 abuts against the limiting part 341 of the spring sleeve 34, and this number of pulses is the opening pulse number; when the same number of pulses is continuously applied to the same batch of electronic expansion valves, the distance that the screw rod 31 drives the spring sleeve 34 and the valve needle body 33 to move away from the valve port 102 is the same in the single valve part of the same batch of electronic expansion valves. In this way, it is ensured that, in the same batch of electronic expansion valves, the consistency of the change in the flow rate at the valve port 102 of the single valve part from the state where the second stop part 52 and the first stop part 51 stop cooperate to the process of moving the valve needle part 30 to the upper limit position, under the condition that the same number of pulses is applied to the same batch of electronic expansion valves, thereby ensuring the consistency of the flow rate at the valve port 102 during the process in which the screw rod 31 of the valve needle part 30 of the electronic expansion valve moves away from the valve port 102 in the axial direction.

[0136] The utility model embodiment four still provides a kind of assembly method of electronic expansion valve, it is used to assemble the electronic expansion valve of embodiment one, specifically includes the following steps:

[0137] Step 1: the screw rod 31 of valve needle component 30 is respectively screwed into the second internal thread hole 401 of rotor component 40 and the first internal thread hole 201 of nut seat 20, until the screw rod 31 and rotor component 40 are mutually blocked and fixed in the axial direction of screw rod 31;

[0138] Step 2: continue to rotate screw rod 31 from top to bottom along the direction of closing valve in the first internal thread hole 201 of nut seat 20, until valve needle component 30 is in lower limit position.

[0139] Wherein, the screw rod 31 of valve needle component 30 is screwed into the second internal thread hole 401 of rotor component 40 and the first internal thread hole 201 of nut seat 20 in adjustable order.

[0140] In the embodiment of the present scheme, step 1 specifically includes: before installing valve needle component 30, nut seat 20 is fixed on valve seat 11;The screw rod 31 of valve needle component 30 is sequentially screwed into the second internal thread hole 401 of rotor component 40 and the first internal thread hole 201 of nut seat 20 from top to bottom along the direction of closing valve, until the screw rod 31 and rotor component 40 are mutually blocked and fixed in the axial direction of screw rod 31.

[0141] Further, the screw rod 31 and rotor component 40 are mutually blocked and fixed in the axial direction of screw rod 31 specifically includes: the stepped structure of screw rod 31 is rotated to abut with the stepped surface of rotor component 40, to limit the relative position of screw rod 31 and rotor component 40 in axial direction;Limiting sheet 60 is fixedly connected with screw rod 31 and rotor component 40 respectively.

[0142] In the embodiment of the present scheme, step 1 further includes: adjusting the position of rotor component 40 and 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.

[0143] Further, valve needle component 30 is in lower limit position specifically includes: the first stop 51 is abutted with the second stop 52, to limit the relative position of screw rod 31 and nut seat 20 in axial direction.

[0144] The utility model discloses embodiment five further provides a kind of assembly method of electronic expansion valve, it can be used to assemble the electronic expansion valve of embodiment two and embodiment three, it is different from embodiment four, step 1 specifically includes: the screw rod 31 of valve needle component 30 is rotated into the first internal thread hole 201 of nut seat 20 from below to above along the opening valve direction, until the top end of screw rod 31 is from the upper end of nut seat 20 and is worn out;Nut seat 20 is assembled to valve seat 11;Rotary rotor component 40 is rotated to the screw rod 31 of valve needle component 30 from above to below along the closing valve direction by the second internal thread hole 401 of rotor component 40, until rotor component 40 and screw rod 31 are mutually blocked and fixed in the axial direction of screw rod 31.

[0145] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0146] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application, unless otherwise specifically stated. Also, it is to be understood that the dimensions of the various parts shown in the drawings are not drawn to scale. Techniques, methods, and apparatus known to those of ordinary skill can not be discussed in detail because they can be readily understood from the disclosure given herein and the technical, method, and apparatus should be considered as part of the present specification. In all examples shown and discussed herein, any specific value is to be interpreted as exemplary only and not as a limitation. Thus, other examples of the example embodiments can have different values. It is to be noted that like numbers and letters refer to like elements throughout the several views of the drawings and as such, detailed discussions of microfabricated structures, devices, and methods will not be repeated in connection with the drawings, once one or more structures, devices, and / or methods has been discussed in detail.

[0147] In the description of the present application, it is to be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; The orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0148] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial relative descriptors used herein interpreted accordingly.

[0149] In addition, it should be noted that the use of "first", "second", and the like words of distinction do not connote any meaning of importance, but are used solely to differentiate one element from another, and are used in the context of this application without implying any specific order, or order of precedence. Accordingly, a first element that follows an operation can be performed before, after, or at the same time as a second element that precedes the operation.

[0150] The preferred embodiments of the present application have been described above with the purpose of enabling not only the best modes of practicing the application known to the inventors at this time, but also of enabling others skilled in the art to utilize the application in various embodiments and with various modifications as are suited to the particular use contemplated. Therefore, the above description is intended to be illustrative, but not restrictive, of the scope of the present application. All patents and patent applications mentioned herein are incorporated by reference in their entirety.

Claims

1. An electronic expansion valve characterized by, The electronic expansion valve comprises: a valve body (10) having a receiving cavity (101) and a valve port (102); a nut seat (20) arranged in the receiving cavity (101), the nut seat (20) being provided with a first internally threaded hole (201) coaxial with the valve port (102); a valve needle component (30) arranged in the receiving cavity (101), the valve needle component (30) having a screw rod (31) and a valve needle body (33) arranged oppositely along an axial direction, the valve needle body (33) being arranged close to the valve port (102) and capable of adjusting a flow rate at the valve port (102), the screw rod (31) having a mating thread, and the screw rod (31) being threadedly connected with the first internally threaded hole through the mating thread; a rotor component (40) rotatably arranged in the receiving cavity (101) and located on a side of the nut seat (20) away from the valve port (102), the rotor component (40) being provided with a second internally threaded hole (401), the mating thread on the rotor component (40) and the screw rod (31) being threadedly connected through the second internally threaded hole (401), and the rotor component (40) and the screw rod (31) being fixedly connected.

2. The electronic expansion valve according to claim 1, characterized in that The mating thread on the screw rod (31) is a continuous mating thread, and the first internally threaded hole (201) and the second internally threaded hole (401) are respectively threadedly connected with 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 further comprises: a first stop portion (51) arranged on the nut seat (20); a second stop portion (52) arranged 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, a first stop surface (511) of the first stop portion (51) abuts against a second stop surface (521) of the second stop portion (52), and the screw rod (31) cannot move any more in a direction towards the valve port (102) or in a direction away from the valve port (102).

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

5. The electronic expansion valve according to claim 3, wherein The electronic expansion valve further comprises: a third stop portion (53) provided on the rotor member (40), the third stop portion (53) being located on a side of the second stop portion (52) close to the valve port (102); the limit positions include a lower limit position and an upper limit position, when the valve needle member (30) is in the lower limit position, the first stop portion (51) and the second stop portion (52) are in stop cooperation, and the screw rod (31) cannot move any more in a direction towards the valve port (102); when the valve needle member (30) is in the upper limit position, the first stop portion (51) and the third stop portion (53) are in stop cooperation, and the screw rod (31) cannot move any more in a direction away from the valve port (102).

6. The electronic expansion valve according to claim 3, characterized in that, when the valve needle member (30) is in the limit position, an overlapping dimension of the second stop surface (521) and the first stop surface (511) in an axial direction of the valve needle member (30) is h1; a pitch of the mating thread is h, h1 < h; and / or an assembly gap of the thread of the first internal threaded hole (201) and the mating thread in the axial direction of the valve needle member (30) is h2, h1 > h2.

7. The electronic expansion valve according to claim 6, characterized in that The rotor member (40) comprises a connecting plate (411), the connecting plate (411) being located at an end of the nut seat (20) away from the valve port (102), the second internal threaded hole (401) being provided on a side of the connecting plate (411) close to the nut seat (20), the second stop portion (52) being provided on a side of the connecting plate (411) close to the nut seat (20), and the first stop portion (51) being provided on an outer side wall of the nut seat (20) close to 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 a first internal threaded segment, and the thread of the second internal threaded hole (401) is a second internal threaded segment; a pitch of the mating thread is h; a distance between a starting point of the first internal threaded segment and an end of the first stop portion (51) close to the connecting plate (411) is h5; The distance between the starting point of the second internal thread section and the end of the connecting plate (411) away from the second stop (52) is h4; When the valve needle component (30) is in the limit position, the distance between the starting point of the first internal thread section and the starting point of the second internal thread section in the axial direction of the valve needle component (30) is h3; Wherein, h3=h4+h5-h1; h3 / h=q, remainder c, n is the number of integral turns of the matching thread on the screw rod (31) between the starting point of the second internal thread section and the starting point of the first internal thread section when the valve needle component (30) is in the limit position; Q2-Q1=c*360°.

9. The electronic expansion valve according to claim 7, wherein The screw rod (31) and the rotor component (40) are limited in the axial direction of the valve needle component (30).

10. The electronic expansion valve according to claim 9, characterized in that The side of the connecting plate (411) away from the nut seat (20) is provided with an assembly hole (402) which 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 rod (31) penetrates the first internal thread hole (201) and the assembly hole (402), and the stepped surface and the stepped structure (3101) of the screw rod (31) are in abutting fit.

11. The electronic expansion valve according to claim 10, wherein 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 surface of the valve port (102) is h8; When the valve needle component (30) is in the limit position, the screw rod (31) cannot move further in the direction of the valve port (102), the valve needle body (33) is arranged in the valve port (102), the bottom end surface of the valve needle body (33) is below the upper end surface of the valve port (102), the distance between the upper end surface of the valve port (102) and the bottom end surface of the valve needle body (33) is h9, and the distance between the stepped structure (3101) of the valve needle component (30) and the bottom end surface of the valve needle body (33) is h10; Wherein, h10=h7+h8+h9-h1.

12. The electronic expansion valve according to claim 7, wherein The side of the connecting plate (411) away from the nut seat (20) is provided with an assembly hole (402) which communicates with the first internal thread hole (201), the screw rod (31) penetrates the first internal thread hole (201) and the assembly hole (402), and the electronic expansion valve further comprises: A limiting sheet (60) is arranged on the screw rod (31) and located in the assembly hole (402), and the limiting sheet (60) is fixedly connected with the assembly hole (402).

13. The electronic expansion valve according to claim 3, wherein The screw rod (31) and the valve needle body (33) are integrally arranged, when the valve needle component (30) is in the limit position, the screw rod (31) cannot move towards the valve port (102) any more, the end of the valve needle body (33) away from the screw rod (31) is arranged in the valve port (102), and a flow gap is formed between the side wall of the end of the valve needle body (33) away from the screw rod (31) and the valve port (102).

14. The electronic expansion valve according to claim 3, wherein The screw rod (31) and the valve needle body (33) are separately arranged, the valve needle component (30) further comprises: a resilient part (32), the extension direction of the resilient part (32) is the same as the axis direction of the screw rod (31), the first end of the resilient part (32) abuts against the end of the screw rod (31) close to the valve port (102), the second end of the resilient part (32) abuts against the end of the valve needle body (33) away from the valve port (102), when the screw rod (31) cannot move towards the valve port (102) any more, the resilient part (32) provides a pre-tightening force towards the valve port (102) to the valve needle body (33).

15. The electronic expansion valve according to claim 14, wherein The valve needle component (30) further comprises: a spring sleeve (34) movably arranged in the end of the nut seat (20) close to the valve port (102), one end of the spring sleeve (34) movably sleeved on the end of the screw rod (31) close to the resilient part (32), the other end of the spring sleeve (34) fixedly connected with the valve needle body (33), the spring sleeve (34) and the valve needle body (33) are integrally arranged or separately arranged, the resilient part (32) is located in the spring sleeve (34), a limiting part (341) is arranged on the spring sleeve (34), the limiting part (341) limitingly matched with the screw rod (31), so that the screw rod (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, wherein The end of the spring sleeve (34) away from the valve needle body (33) has a limiting part (341) protruding towards the axis direction of the spring sleeve (34), the end of the screw rod (31) close to the resilient part (32) has a limiting block (311), the limiting block (311) is used for abutting and matching with the limiting part (341) and the resilient part (32); During the movement of the valve needle component (30) towards the valve port (102), the limiting block (311) respectively abuts and matches with the limiting part (341) and the resilient part (32); After the valve needle body (33) blocks the valve port (102), the rotor component (40) continues to drive the screw rod (31) to rotate, the limiting block (311) abuts against the resilient part (32) and compresses the resilient part (32), the limiting block (311) is separated from the limiting part (341), until the first stop part (51) and the second stop part (52) stop matching.

17. The electronic expansion valve according to claim 16, wherein The screw rod (31) is provided with a stepped structure (3101) which is in axial limiting fit with the rotor component (40); when the first stop surface (511) and the second stop surface (521) abut, the screw rod (31) cannot move any more in the direction of the valve port (102); when the first stop surface (511) and the second stop surface (521) abut, The interval between the stepped structure (3101) of the screw rod (31) and the bottom end surface of the valve needle body (33) is h10; The interval between the stepped structure (3101) of the screw rod (31) and the end surface of the limiting block (311) close to the limiting portion (341) is h11; The interval between the end surface of the limiting portion (341) of the spring sleeve (34) close to the limiting block (311) and the upper end surface of the valve port (102) is h12; The interval between the end surfaces of the limiting block (311) and the limiting portion (341) close to each other is h13; Wherein, h10=h11+h12+h9-h13.

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