Electronic expansion valve and machining method thereof

Abstract

The invention provides an electronic expansion valve and a machining method thereof.The electronic expansion valve comprises a sleeve and a valve rod, the sleeve is provided with a blocking end and an opening end, a containing cavity and a valve cavity are formed in the sleeve, the valve cavity is arranged close to the opening end, and a communicating opening is formed in the side wall of the sleeve, communicates with the valve cavity and is used for communicating with a communicating pipeline; the valve sleeve is arranged at the open end, the open end is blocked by the valve sleeve, the valve sleeve is provided with a circulation channel, the circulation channel is communicated with the valve cavity, the valve element is arranged on the valve sleeve, the valve element is provided with a valve port, and the valve cavity, the valve port and the circulation channel are communicated with one another; and the valve needle is movably arranged in the sleeve, the valve needle is arranged corresponding to the valve port, and the valve needle can adjust the flow at the valve port. Through the technical scheme provided by the invention, the problem of low mounting efficiency of the electronic expansion valve in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and in particular to an electronic expansion valve and a processing method thereof. Background Art

[0002] The electronic expansion valve in the prior art mainly includes components such as a sleeve, a valve needle, a guide sleeve and a valve seat. The valve seat has a valve cavity, the sleeve has a receiving cavity, the valve seat and the sleeve jointly receive the valve needle and the guide sleeve, the valve seat has a valve port, and the valve needle can cooperate with the guide sleeve to move closer to or farther from the valve port to adjust the flow rate of the fluid at the valve port. During the assembly process of the existing electronic expansion valve, it is necessary to first fix the valve needle and the guide sleeve and other components in the valve cavity and the receiving cavity respectively, and then fix the valve seat and the sleeve to complete the assembly. The above design structure results in cumbersome assembly procedures of the electronic expansion valve and low production efficiency. Summary of the invention

[0003] The invention provides an electronic expansion valve and a processing method thereof, so as to solve the problem of low installation efficiency of the electronic expansion valve in the prior art.

[0004] According to one aspect of the present invention, there is provided an electronic expansion valve, comprising: a sleeve having a blocked end and an open end, a housing chamber and a valve chamber inside the sleeve, the valve chamber being arranged close to the open end, a side wall of the sleeve having a connecting port, the connecting port being connected to the valve chamber, the connecting port being used to connect to a connecting pipeline; a valve sleeve and a valve core, the valve sleeve being arranged at the open end, the valve sleeve blocking the open end, the valve sleeve having a flow channel, the flow channel being connected to the valve chamber, the valve core being arranged on the valve sleeve, the valve core having a valve port, the valve chamber, the valve port and the flow channel being connected to each other; a valve needle being movably arranged in the sleeve, the valve needle being arranged corresponding to the valve port, and the valve needle being able to adjust the flow at the valve port.

[0005] By applying the technical solution of the present invention, the sleeve as a whole has a accommodating cavity and a valve cavity, and the valve needle and the valve sleeve are arranged in the sleeve. When assembling the electronic expansion valve, it is only necessary to put the valve needle into the sleeve, and then use the valve sleeve to seal the open end of the sleeve to complete the assembly. Because the sleeve has an integrated accommodating cavity and valve cavity, compared with the traditional technical solution in which the sleeve and the valve seat are separately arranged, the technical solution provided by the present application can reduce the difficulty of assembling the electronic expansion valve. There is no need to fix the remaining components in the valve cavity and the accommodating cavity respectively, and then connect and fix the sleeve and the valve seat. In this way, the assembly process can be reduced and production efficiency can be improved.

[0006] Furthermore, the valve sleeve has a fixed section and a flow section that are interconnected, a port of the fixed section is fixedly connected to a port of the open end, the flow section is located in the valve cavity, the flow section has a flow channel, and the valve core is arranged in the flow section. Through the above arrangement, compared with the existing electronic expansion valve that needs to distinguish valve seats of different sizes and occupies turnover placement space, the valve core in the present application occupies less space and is convenient for turnover and transportation.

[0007] Furthermore, the circulation section has a first step section and a second step section connected in sequence, the diameter of the first step section is smaller than the diameter of the second step section, the second step section is connected to the fixed section, a first step surface is provided between the first step section and the second step section, an end of the valve core away from the opening end abuts against the first step surface, and an end of the valve core close to the opening end abuts against the connecting pipeline to fix the valve core in the valve sleeve. Through the above arrangement, the first step surface and the connecting pipeline cooperate to limit the valve core, thereby ensuring the stability of the valve core during the movement of the electronic expansion valve.

[0008] Furthermore, a flow port is provided on the side wall of the flow section, and the flow port is located on the side of the valve core away from the opening end, and the flow channel is connected to the valve cavity through the flow port. Through the above arrangement, it is possible to ensure that the flow of the refrigerant fluid in the flow channel is sufficient, and prevent the flow port from throttling the refrigerant fluid.

[0009] Furthermore, the electronic expansion valve further comprises a guide sleeve, which is arranged in the sleeve, the valve needle has an external thread section, the guide sleeve has an internal thread section, the valve needle and the guide sleeve are threadedly matched to adjust the distance relative to the valve port, a limiting structure is provided between the guide sleeve and the sleeve, the side of the guide sleeve close to the valve port abuts against the valve sleeve, the valve needle is sequentially inserted into the guide sleeve and the valve sleeve, and the axial position of the guide sleeve in the sleeve is fixed by the limiting structure and the valve sleeve. Through the above arrangement, the guide sleeve can be fixed in the sleeve through the valve sleeve and the limiting structure, preventing the guide sleeve from approaching or moving away from the valve port under the drive of the valve needle, thereby ensuring the accuracy of the valve needle in regulating the flow at the valve port.

[0010] Furthermore, the outer wall of the guide sleeve is provided with a first limiting step and a second limiting step at intervals along the axis, the second limiting step is provided close to the valve port, the second limiting step is in contact with the side of the valve sleeve away from the opening end, the inner diameter of the accommodating cavity is smaller than the inner diameter of the valve cavity, the connection between the accommodating cavity and the valve cavity has a second step surface, and the second step surface cooperates with the first limiting step to limit the position. Through the above arrangement, the second step surface can limit the position of the guide sleeve close to the blocking section, realize the upper limit of the guide sleeve, prevent the guide sleeve from axially displacing toward the blocking end driven by the valve needle, and ensure the performance of the electronic expansion valve.

[0011] Furthermore, the electronic expansion valve further comprises a limiter, which is arranged between the guide sleeve and the second step surface, one side of the limiter abuts against the first limit step, and the other side of the limiter abuts against the second step surface. Through the above arrangement, friction between the guide sleeve and the second step surface can be prevented, thereby improving the service life and stability of the electronic expansion valve.

[0012] Furthermore, the limiting member includes a pressure ring and an elastic sheet, the pressure ring has a through hole, the guide sleeve is inserted into the through hole, the elastic sheet has a connecting end and a free end that are arranged opposite to each other, the first end of the pressure ring abuts against the second step surface, the second end of the pressure ring is connected to the connecting end, and the free end abuts against the first limiting step. Through the above arrangement, the first end of the pressure ring abuts against the second step surface, which can ensure that the force from the pressure ring on the second step surface is relatively uniform, prevent the guide sleeve from being displaced in the sleeve, and ensure the stability of the operation process of the electronic expansion valve.

[0013] Furthermore, the limiting member includes a plurality of elastic sheets, the plurality of elastic sheets are arranged in a ring-shaped interval in the through hole, there is an escape space between the free ends of the plurality of elastic sheets, the guide sleeve is arranged in the escape space, the elastic sheet has a connecting section and an abutting section connected in sequence, the connecting section is away from one end of the abutting section to form a connecting end, the connecting section extends in a direction close to the first end, the abutting section extends in an axial direction close to the guide sleeve, and the abutting section cooperates with the end face of the first limiting step to abut. Through the above arrangement, the elastic sheet can provide elastic compensation for the guide sleeve, absorb the force of the guide sleeve being impacted by the refrigerant fluid, prevent the guide sleeve from shaking, ensure the guiding function of the guide sleeve, and improve the stability of the electronic expansion valve.

[0014] Furthermore, the sleeve and / or valve sleeve are formed by a stretching process. This arrangement can reduce the overall processing cost of the electronic expansion valve. At the same time, the stretching process has high precision, which can reduce the tolerance of the sleeve and valve sleeve during the forming process and ensure the accuracy of the flow adjustment of the electronic expansion valve.

[0015] Furthermore, the electronic expansion valve further includes a rotation-stopping structure, which is arranged between the guide sleeve and the valve sleeve, and is used to limit the guide sleeve from rotating relative to the valve sleeve. Through the above arrangement, it is possible to prevent the guide sleeve from rotating relative to the valve sleeve during the movement of the valve needle, thereby affecting the accuracy of the flow rate at the valve port adjusted by the valve needle.

[0016] Furthermore, the anti-rotation structure includes an anti-rotation protrusion and an anti-rotation hole. The anti-rotation protrusion is arranged on the guide sleeve, and the anti-rotation protrusion is not located on the axis of the guide sleeve. The anti-rotation hole is arranged on the valve sleeve, and the anti-rotation protrusion is inserted into the anti-rotation hole. The anti-rotation protrusion cooperates with the anti-rotation hole to limit the guide sleeve from rotating relative to the valve sleeve. Through the above arrangement, the anti-rotation protrusion can be stuck in the anti-rotation hole, thereby preventing the guide sleeve from rotating relative to the valve sleeve during the movement of the valve needle, thereby improving the performance of the electronic expansion valve.

[0017] Furthermore, the guide sleeve includes a first connecting section and a second connecting section connected in sequence, the outer diameter of the first connecting section is larger than the outer diameter of the second connecting section, the end of the valve sleeve away from the opening end has a first mounting hole, the second connecting section is inserted into the first mounting hole, a stop protrusion is provided on the side wall of the second connecting section, the stop hole is located at the end of the valve sleeve away from the opening end, and is connected to the first mounting hole. Through the above arrangement, the second connecting section is inserted into the first mounting hole to prevent the guide sleeve from being impacted by the refrigerant fluid and ensuring stability. The outer diameter of the first connecting section is set to be larger than the outer diameter of the second connecting section, so that the guide sleeve can abut against the end of the valve sleeve away from the opening end, and play an axial limiting role on the guide sleeve. The stop protrusion cooperates with the stop hole to play a circumferential limiting role on the guide sleeve. In this way, the stability of the guide sleeve during the operation of the electronic expansion valve can be ensured, and the performance of the electronic expansion valve can be improved.

[0018] Furthermore, the anti-rotation structure includes a plurality of anti-rotation protrusions and a plurality of anti-rotation holes, wherein the plurality of anti-rotation protrusions are arranged at annular intervals on the side wall of the second connecting section, and the anti-rotation holes are arranged one by one with the anti-rotation protrusions. Through the above arrangement, the plurality of anti-rotation protrusions and the anti-rotation holes cooperate to enhance the circumferential limiting effect of the limiting structure, thereby ensuring the limiting function of the limiting structure.

[0019] Furthermore, the electronic expansion valve further comprises a connecting pipe and a welding ring, one end of the connecting pipe is inserted into the valve sleeve, the connecting pipe is located on the side of the valve core away from the valve needle, the welding ring is arranged between the connecting pipe and the valve sleeve, and the connecting pipe is welded to the valve sleeve through the welding ring. Through the above arrangement, the welding ring can improve the connection performance between the connecting pipe and the valve sleeve, prevent the connecting pipe from falling off from the valve sleeve, and ensure the limiting effect of the connecting pipe on the valve core.

[0020] Furthermore, the diameter of the fixed section is larger than the diameter of the flow section, the connecting pipe is inserted into the flow section, and the welding ring is located between the flow section and the side wall of the connecting pipe. Through the above arrangement, the welding area between the flow section and the connecting pipe can be increased, the welding strength between the connecting pipe and the valve sleeve can be improved, and the reliability of the electronic expansion valve can be improved.

[0021] Furthermore, there is a gap between the inner wall of the connection between the flow section and the fixed section and the side wall of the connecting pipe, and the welding ring is located in the gap. Through the above arrangement, it is convenient to fix the welding ring when welding the connecting pipe and the valve sleeve, ensure the quality of the welding process, and reduce the possibility of gaps in the welding.

[0022] Furthermore, the connection between the fixed section and the flow section is an arc transition. Through the above arrangement, the connection strength between the fixed section and the flow section can be improved, and the valve sleeve stretching molding can be facilitated, the production difficulty can be reduced, and the production efficiency can be improved.

[0023] According to another aspect of the present invention, a processing method for an electronic expansion valve is provided. The electronic expansion valve is the above-mentioned electronic expansion valve, and the processing method comprises: step one, fixing the valve needle in the sleeve and fixing the valve core on the valve sleeve; step two, fixing the valve sleeve at the open end of the sleeve and correspondingly inserting the valve core into the valve sleeve.

[0024] According to the technical solution provided by the present invention, during the processing of the electronic expansion valve, by first fixing the valve needle in the sleeve in step one and then fixing the valve sleeve to the opening of the sleeve, the valve port of the valve core can be easily aligned with the valve needle, thereby preventing the valve needle from deviating from the relative position of the valve port with the valve needle due to assembly accuracy problems during the processing of the electronic expansion valve, resulting in assembly failure. This can improve the assembly efficiency of the electronic expansion valve and ensure the assembly quality.

[0025] Furthermore, the electronic expansion valve also includes a guide sleeve and a limiter. After the valve needle is fixed in the sleeve, the processing method also includes: setting the limiter in the sleeve so that one side of the limiter abuts against the inner wall of the sleeve; threading the guide sleeve with the valve needle, and abutting one side of the guide sleeve with the other side of the limiter; wherein step two also includes abutting one end of the valve sleeve located in the sleeve with the side of the guide sleeve away from the limiter. Through the above arrangement, it is possible to prevent the situation that when the guide sleeve is first threadedly connected to the valve needle, the position of the guide sleeve is fixed but the valve needle cannot be fixed, or the position of the valve needle is fixed but the position of the guide sleeve cannot be fixed. The position of the valve needle is determined first, and then the position of the guide sleeve is adjusted, which can ensure the accuracy of the thread matching between the guide sleeve and the valve needle during the operation of the electronic expansion valve.

[0026] Furthermore, the electronic expansion valve also includes a connecting pipe, and the valve core is fixed on the valve sleeve, specifically including: placing the valve core in the valve sleeve, and making one side of the valve core abut against the inner wall of the valve sleeve; inserting one end of the connecting pipe into the valve sleeve and abutting against the other side of the valve core; and welding and fixing the connecting pipe to the valve sleeve. Through the above arrangement, the valve sleeve can be processed and assembled in advance, and when the overall assembly of the electronic expansion valve is required, the number of parts and assembly procedures can be reduced, thereby improving the assembly efficiency of the electronic expansion valve.

[0027] Figure Description

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 The schematic diagram of the structure of the electronic expansion valve provided by the present invention is shown;

[0030] Figure 2 A schematic diagram showing the structure of the valve sleeve and the valve core provided by the present invention is shown;

[0031] Figure 3 A schematic structural diagram of a guide sleeve provided by the present invention is shown;

[0032] Figure 4 A schematic structural diagram of a position limiting member provided by the present invention is shown;

[0033] Figure 5 A cross-sectional view of a position limiting member provided by the present invention is shown;

[0034] Figure 6 A top view of the valve sleeve provided by the present invention is shown.

[0035] The above drawings include the following reference numerals:

[0036] 10. sleeve; 11. accommodating chamber; 12. valve chamber; 13. connecting port; 14. second step surface;

[0037] 20. valve sleeve; 21. fixed section; 22. flow section; 221. first step section; 222. second step section; 223. first step surface; 23. flow port; 24. anti-rotation hole; 25. first mounting hole;

[0038] 30. Valve core; 31. Valve port;

[0039] 40. Valve needle;

[0040] 50. Guide sleeve; 51. First limiting step; 52. Second limiting step; 53. Anti-rotation protrusion; 54. Second connecting section; 55. First connecting section;

[0041] 60. Limiting member; 61. Pressing ring; 62. Elastic sheet;

[0042] 70. Welding ring;

[0043] 80. Connecting pipe. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] like Figure 1As shown, according to one aspect of the present invention, an electronic expansion valve is provided, which includes a sleeve 10, a valve sleeve 20, a valve core 30 and a valve needle 40. The sleeve 10 has a blocking end and an open end, and has a housing chamber 11 and a valve chamber 12 in the sleeve 10. The valve chamber 12 is arranged near the open end. The side wall of the sleeve 10 has a connecting port 13, which is connected to the valve chamber 12. The connecting port 13 is used to communicate with the connecting pipeline. The valve sleeve 20 is arranged at the open end, the valve sleeve 20 blocks the open end, the valve sleeve 20 has a circulation channel, and the circulation channel is connected to the valve chamber 12. The valve core 30 is arranged on the valve sleeve 20, and the valve core 30 has a valve port 31. The valve chamber 12, the valve port 31 and the circulation channel are connected to each other. The valve needle 40 is movably arranged in the sleeve 10, and the valve needle 40 is arranged corresponding to the valve port 31. The valve needle 40 can adjust the flow at the valve port 31.

[0046] Applying the technical solution of the present invention, the electronic expansion valve includes a sleeve 10, a valve sleeve 20, a valve core 30 and a valve needle 40. The sleeve 10 as a whole has a accommodating chamber 11 and a valve chamber 12. The valve needle 40 and the valve sleeve 20 are arranged in the sleeve 10. When assembling the electronic expansion valve, it is only necessary to put the valve needle 40 into the sleeve 10, and then use the valve sleeve 20 to seal the open end of the sleeve 10 to complete the assembly. Because the sleeve 10 has an integrated accommodating chamber 11 and a valve chamber 12, compared with the traditional technical solution in which the sleeve and the valve seat are separately arranged, the technical solution provided by the present application can reduce the difficulty of assembling the electronic expansion valve. There is no need to fix the remaining components in the valve chamber and the accommodating chamber respectively, and then connect and fix the sleeve and the valve seat. In this way, the assembly process can be reduced and production efficiency can be improved.

[0047] Specifically, the valve sleeve 20 has a fixed section 21 and a flow section 22 that are interconnected. The port of the fixed section 21 is fixedly connected to the port of the open end. The flow section 22 is located in the valve cavity 12. The flow section 22 has a flow channel, and the valve core 30 is arranged in the flow section 22. Through the above arrangement, the refrigerant fluid can enter the valve cavity 12 through the connecting port 13, and then flow through the valve port 31 through the flow channel. The valve port 31 cooperates with the valve needle 40 to achieve throttling of the refrigerant fluid and ensure the flow performance of the electronic expansion valve. In addition, when it is necessary to assemble electronic expansion valves with different flow areas, it is only necessary to replace the valve core 30 of different sizes to achieve the update of the overall product. Compared with the existing electronic expansion valves that need to distinguish valve seats of different sizes and occupy turnover placement space, the valve core 30 in this application occupies less space and is more convenient for turnover and transportation.

[0048] In a specific embodiment of the present application, the fixed section 21 is connected to the open end by laser welding. Laser welding can reduce the heat-affected zone during welding, reduce the effect of heat on the deformation of the connection between the valve sleeve 20 and the sleeve 10, ensure the connection accuracy between the valve sleeve 20 and the sleeve 10, and prevent leakage of the refrigerant fluid in the valve chamber 12.

[0049] like Figure 2 As shown, the circulation section 22 has a first step section 221 and a second step section 222 connected in sequence, the diameter of the first step section 221 is smaller than the diameter of the second step section 222, the second step section 222 is connected to the fixed section 21, and a first step surface 223 is provided between the first step section 221 and the second step section 222, the end of the valve core 30 away from the opening end abuts against the first step surface 223, and the end of the valve core 30 close to the opening end abuts against the connecting pipeline, so as to fix the valve core 30 in the valve sleeve 20. Through the above arrangement, the first step surface 223 can limit the position of the valve core 30 toward the blocking end, the end of the valve core 30 close to the opening end and the connecting pipeline can limit the position of the valve seat toward the opening end, and the first step surface 223 and the connecting pipeline can cooperate with each other to limit the position of the valve core 30, thereby ensuring the stability of the valve core 30 during the movement of the electronic expansion valve. The above technical solution has a simple structure and is convenient for disassembling and assembling the valve core 30.

[0050] Furthermore, a flow port 23 is provided on the side wall of the flow section 22, and the flow port 23 is located on the side of the valve core 30 away from the opening end, and the flow channel is connected with the valve cavity 12 through the flow port 23. Through the above arrangement, the refrigerant fluid in the valve cavity 12 can enter the flow channel through the flow port 23, so as to achieve the communication between the flow channel and the valve cavity 12. Specifically, in the present application, a plurality of flow ports 23 are provided, and the plurality of flow ports 23 are arranged at annular intervals, so as to ensure that the flow rate of the refrigerant fluid in the flow channel is sufficient, and to prevent the flow port 23 from throttling the refrigerant fluid. Specifically, the flow ports 23 can be provided with 3, 4 or 5, as long as the refrigerant fluid can enter the flow channel normally.

[0051] like Figure 3 As shown, the electronic expansion valve also includes a guide sleeve 50, which is arranged in the sleeve 10, the valve needle 40 has an external thread section, the guide sleeve 50 has an internal thread section, the valve needle 40 and the guide sleeve 50 are threadedly matched to adjust the distance relative to the valve port 31, and there is a limiting structure between the guide sleeve 50 and the sleeve 10, and the side of the guide sleeve 50 close to the valve port 31 abuts against the valve sleeve 20, and the valve needle 40 is sequentially inserted into the guide sleeve 50 and the valve sleeve 20, and the axial position of the guide sleeve 50 in the sleeve 10 is fixed by the limiting structure and the valve sleeve 20. Through the above arrangement, the guide sleeve 50 can be fixed in the sleeve 10 through the valve sleeve 20 and the limiting structure, preventing the guide sleeve 50 from approaching or moving away from the valve port 31 under the drive of the valve needle 40, thereby ensuring the accuracy of the valve needle 40 in adjusting the flow at the valve port 31, and improving the performance of the electronic expansion valve. Through the above technical solution, the guide sleeve 50 can be easily installed, and the overall installation efficiency of the device can be improved.

[0052] Furthermore, the outer wall of the guide sleeve 50 is provided with a first limiting step 51 and a second limiting step 52 at intervals along the axis, the second limiting step 52 is provided close to the valve port 31, the second limiting step 52 abuts against the side of the valve sleeve 20 away from the opening end, the inner diameter of the accommodating chamber 11 is smaller than the inner diameter of the valve chamber 12, and the connection between the accommodating chamber 11 and the valve chamber 12 has a second step surface 14, and the second step surface 14 cooperates with the first limiting step 51 to limit the position. Through the above arrangement, the second step surface 14 can limit the position of the guide sleeve 50 close to the blocking end, realize the upper limit of the guide sleeve 50, prevent the guide sleeve 50 from axially displacing toward the blocking end under the drive of the valve needle 40, and ensure the accuracy of the threaded fit between the valve needle 40 and the guide sleeve 50.

[0053] In a specific embodiment of the present application, the electronic expansion valve further includes a limiter 60, which is arranged between the guide sleeve 50 and the second step surface 14, one side of the limiter 60 abuts against the first limiter step 51, and the other side of the limiter 60 abuts against the second step surface 14. Through the above arrangement, the limiter 60 is arranged between the guide sleeve 50 and the second step surface 14, which can prevent friction between the guide sleeve 50 and the second step surface 14, causing wear between the first limiter step 51 and the second step surface 14 of the guide sleeve 50, and causing deformation of the guide sleeve 50 or the sleeve 10, thereby improving the service life and stability of the electronic expansion valve. By setting the limiter 60, the guide sleeve 50 can be easily installed in a limited position.

[0054] like Figure 4 and Figure 5 As shown, the limiter 60 includes a pressure ring 61 and an elastic sheet 62. The pressure ring 61 has a through hole, and the guide sleeve 50 is inserted into the through hole. The elastic sheet 62 has a connecting end and a free end that are arranged oppositely. The first end of the pressure ring 61 abuts against the second step surface 14, the second end of the pressure ring 61 is connected to the connecting end, and the free end abuts and cooperates with the first limiter step 51. Through the above arrangement, the pressure ring 61 is annular, and the first end of the pressure ring 61 abuts against the second step surface 14, which can ensure that the force from the pressure ring 61 on the second step surface 14 is relatively balanced, and prevent the pressure ring 61 from receiving uneven circumferential force after abutting against the second step surface 14, so that the limiter 60 is deflected, and further prevent the guide sleeve 50 from being displaced in the sleeve 10, so as to ensure the stability of the operation process of the electronic expansion valve.

[0055] Among them, the elastic sheet 62 can be arranged on the outside of the pressure ring 61, or can be arranged inside the pressure ring 61. In this embodiment, the limiter 60 includes a plurality of elastic sheets 62, and the plurality of elastic sheets 62 are arranged in a ring-shaped interval in the through hole, and there is an escape space between the free ends of the plurality of elastic sheets 62, and the guide sleeve 50 is inserted in the escape space, and the elastic sheet 62 has a connecting section and an abutting section connected in sequence, and the connecting section is away from the end of the abutting section to form a connecting end, and the connecting section extends in a direction close to the first end, and the abutting section extends along the axial direction close to the guide sleeve 50, and the abutting section cooperates with the end face of the first limit step 51 to abut. Through the above arrangement, the elastic sheet 62 can provide elastic compensation for the guide sleeve 50, absorb the force of the guide sleeve 50 impacted by the refrigerant fluid, prevent the guide sleeve 50 from shaking, ensure the guiding function of the guide sleeve 50, and improve the stability of the electronic expansion valve.

[0056] In a specific embodiment of the present application, the sleeve 10 and the valve sleeve 20 are formed by a stretching process. This arrangement can reduce the overall processing cost of the electronic expansion valve. At the same time, the stretching process has high precision, which can reduce the tolerance of the sleeve 10 and the valve sleeve 20 during the forming process, and ensure the accuracy of the flow adjustment of the electronic expansion valve.

[0057] In another specific embodiment of the present application, the sleeve 10 or the valve sleeve 20 is formed by a stretching process. This arrangement can also reduce the overall processing cost of the electronic expansion valve while reducing the tolerance of the sleeve 10 and the valve sleeve 20 during the forming process, thereby ensuring the performance of the electronic expansion valve.

[0058] In a specific embodiment of the present application, the electronic expansion valve further includes a rotation-stopping structure, which is disposed between the guide sleeve 50 and the valve sleeve 20, and is used to limit the guide sleeve 50 from rotating relative to the valve sleeve 20. By providing a limiting structure between the guide sleeve 50 and the valve sleeve 20, it is possible to prevent the guide sleeve 50 from rotating relative to the valve sleeve 20 during the movement of the valve needle 40, thereby affecting the accuracy of the flow rate at the valve port 31 adjusted by the valve needle 40.

[0059] like Figure 3 and Figure 6 As shown, the anti-rotation structure includes an anti-rotation protrusion 53 and an anti-rotation hole 24. The anti-rotation protrusion 53 is arranged on the guide sleeve 50, and the anti-rotation protrusion 53 is not located on the axis of the guide sleeve 50. The anti-rotation hole 24 is arranged on the valve sleeve 20, and the anti-rotation protrusion 53 is penetrated in the anti-rotation hole 24. The anti-rotation protrusion 53 cooperates with the anti-rotation hole 24 to limit the rotation of the guide sleeve 50 relative to the valve sleeve 20. Through the above arrangement, the anti-rotation protrusion 53 can be stuck in the anti-rotation hole 24, thereby preventing the guide sleeve 50 from rotating relative to the valve sleeve 20 during the movement of the valve needle 40, ensuring that the guide sleeve 50 can stably provide a guiding effect for the valve needle 40 during the operation of the electronic expansion valve, thereby improving the performance of the electronic expansion valve.

[0060] In a specific embodiment of the present application, the guide sleeve 50 includes a first connecting section 55 and a second connecting section 54 connected in sequence, the outer diameter of the first connecting section 55 is larger than the outer diameter of the second connecting section 54, the end of the valve sleeve 20 away from the opening end has a first mounting hole 25, the second connecting section 54 is inserted into the first mounting hole 25, and a stop protrusion 53 is provided on the side wall of the second connecting section 54. The stop hole 24 is located at the end of the valve sleeve 20 away from the opening end and is connected to the first mounting hole 25. Through the above-mentioned arrangement, the second connecting section 54 is penetrated in the first mounting hole 25. The first mounting hole 25 can prevent the guide sleeve 50 from being stable when impacted by the refrigerant fluid, and no abnormal shaking will occur, which will cause the failure of the cooperation between the valve needle 40 and the guide sleeve 50. At the same time, the outer diameter of the first connecting section 55 is set to be larger than the outer diameter of the second connecting section 54, so that the guide sleeve 50 can abut against the end of the valve sleeve 20 away from the opening end, thereby limiting the guide sleeve 50 axially. The stop protrusion 53 cooperates with the stop hole 24 to limit the guide sleeve 50 circumferentially. In this way, the stability of the guide sleeve 50 during the operation of the electronic expansion valve can be guaranteed, thereby improving the performance of the electronic expansion valve.

[0061] Among them, in other embodiments, the stop protrusion 53 can also be set on the end face of the first connecting section 55, and the stop hole 24 is set on the end face of the valve sleeve 20 close to one end of the guide sleeve 50. The stop protrusion 53 and the stop hole 24 can cooperate to achieve circumferential limitation of the guide sleeve 50.

[0062] Furthermore, the anti-rotation structure includes a plurality of anti-rotation protrusions 53 and a plurality of anti-rotation holes 24, wherein the plurality of anti-rotation protrusions 53 are arranged at annular intervals on the side wall of the second connecting section 54, and the anti-rotation holes 24 are arranged one by one corresponding to the anti-rotation protrusions 53. Through the above arrangement, the cooperation of the plurality of anti-rotation protrusions 53 and the anti-rotation holes 24 can enhance the circumferential limiting effect of the limiting structure, ensure the limiting function of the limiting structure, and arrange the plurality of anti-rotation protrusions 53 at intervals along the circumferential direction on the outer wall of the guide sleeve 50, which can enhance the connection performance between the anti-rotation protrusions 53 and the guide sleeve 50, thereby reducing the risk of the anti-rotation protrusions 53 falling off from the guide sleeve 50 when the anti-rotation protrusions 53 are subjected to the shear force of the anti-rotation holes 24, thereby ensuring the limiting effect of the anti-rotation protrusions 53 and the anti-rotation holes 24.

[0063] like Figure 2As shown, the electronic expansion valve also includes a connecting pipe 80 and a welding ring 70. One end of the connecting pipe 80 is inserted into the valve sleeve 20. The connecting pipe 80 is located on the side of the valve core 30 away from the valve needle 40. The welding ring 70 is arranged between the connecting pipe 80 and the valve sleeve 20. The connecting pipe 80 is welded to the valve sleeve 20 through the welding ring 70. Through the above arrangement, the welding ring 70 can improve the connection performance between the connecting pipe 80 and the valve sleeve 20, prevent the connecting pipe 80 from falling off from the valve sleeve 20, ensure the limiting effect of the connecting pipe 80 on the valve core 30, and improve the stability of the operation of the electronic expansion valve. In addition, by setting the welding ring 70, the gap between the connecting pipe 80 and the valve sleeve 20 can be sealed, thereby improving the sealing performance of the device as a whole.

[0064] Specifically, in the present application, the diameter of the fixed section 21 is larger than the diameter of the circulation section 22, the connecting pipe 80 is inserted into the circulation section 22, and the welding ring 70 is located between the circulation section 22 and the side wall of the connecting pipe 80. Through the above arrangement, the diameter of the fixed section 21 is larger than the diameter of the circulation section 22, which can ensure that there is enough space inside the valve cavity for the circulation of the refrigerant fluid, and at the same time, the volume of the valve core 30 can be reduced, and the overall manufacturing cost of the electronic expansion valve can be reduced. By arranging the welding ring 70 between the circulation section 22 and the side wall of the connecting pipe 80, the welding area between the circulation section 22 and the connecting pipe 80 can be increased, and the welding strength between the connecting pipe and the valve sleeve 20 can be improved, thereby improving the reliability of the electronic expansion valve.

[0065] Furthermore, there is a gap between the inner wall of the connection between the flow section 22 and the fixed section 21 and the side wall of the connecting pipe 80, and the welding ring 70 is located in the gap. Through the above arrangement, it is convenient to fix the welding ring 70 when welding the connecting pipe 80 and the valve sleeve 20, ensuring that the welding ring 70 can be evenly contacted with the inner wall of the connection between the flow section 22 and the fixed section 21 and the side wall of the connecting pipe 80, so that the quality of the welding process can be further guaranteed and the possibility of gaps in the welding position can be reduced.

[0066] In a specific embodiment of the present application, the connection between the fixed section 21 and the flow section 22 is an arc transition. Through the above arrangement, the connection strength between the fixed section 21 and the flow section 22 can be improved, and the stretching forming of the valve sleeve 20 can be facilitated, the production difficulty can be reduced, and the production efficiency can be improved.

[0067] According to another aspect of the present invention, a processing method for an electronic expansion valve is provided. The electronic expansion valve is the above-mentioned electronic expansion valve, and the processing method comprises: step one, fixing the valve needle 40 in the sleeve 10, and fixing the valve core 30 on the valve sleeve 20; step two, fixing the valve sleeve 20 at the open end of the sleeve 10, and correspondingly inserting the valve core 30 into the valve sleeve 20.

[0068] According to the technical solution provided by the present invention, during the processing of the electronic expansion valve, by first fixing the valve needle 40 in the sleeve 10 in step one and then fixing the valve sleeve 20 in the opening of the sleeve 10, the valve port 31 of the valve core 30 can be easily aligned with the valve needle 40, thereby preventing the valve needle 40 from deviating from the relative position of the valve port 31 due to assembly accuracy problems during the processing of the electronic expansion valve, resulting in assembly failure. This can improve the assembly efficiency of the electronic expansion valve and ensure the assembly quality.

[0069] Specifically, the electronic expansion valve also includes a guide sleeve 50 and a limit piece 60. After the valve needle 40 is fixed in the sleeve 10, the processing method also includes: setting the limit piece 60 in the sleeve 10 so that one side of the limit piece 60 abuts against the inner wall of the sleeve 10, threading the guide sleeve 50 and the valve needle 40, and abutting one side of the guide sleeve 50 against the other side of the limit piece 60, wherein step two also includes abutting one end of the valve sleeve 20 located on the sleeve 10 against the side of the guide sleeve 50 away from the limit piece 60. Through the above arrangement, one side of the guide sleeve 50 abuts against the limit piece 60, and the other side of the guide sleeve 50 abuts against the valve sleeve 20. The guide sleeve 50 can be fixed in the sleeve 10 with the valve sleeve 20 through the limit piece 60. By fixing the valve needle 40 first and then fixing the guide sleeve 50, it can be prevented that when the guide sleeve 50 is first threadedly connected with the valve needle 40, the position of the guide sleeve 50 is fixed but the valve needle 40 cannot be fixed, or the position of the valve needle 40 is fixed but the position of the guide sleeve 50 cannot be fixed. By first determining the position of the valve needle 40 and then adjusting the position of the guide sleeve 50, the accuracy of the threaded fit between the guide sleeve 50 and the valve needle 40 during the operation of the electronic expansion valve can be ensured, thereby improving the performance of the electronic expansion valve.

[0070] Furthermore, the electronic expansion valve further includes a connecting pipe 80, and the valve core 30 is fixed on the valve sleeve 20, specifically including: placing the valve core 30 in the valve sleeve 20, and making one side of the valve core 30 abut against the inner wall of the valve sleeve 20, inserting one end of the connecting pipe 80 into the valve sleeve 20, and abutting against the other side of the valve core 30, and welding and fixing the connecting pipe 80 to the valve sleeve 20. Through the above arrangement, the valve core 30 is first fixed in the valve sleeve 20 through the valve sleeve 20 and the connecting pipe 80, and then the connecting sleeve 10 and the valve sleeve 20 are welded, so that the valve sleeve 20 can be processed and assembled in advance. When the overall assembly of the electronic expansion valve is required, the number of parts and assembly procedures can be reduced, thereby improving the assembly efficiency of the electronic expansion valve.

[0071] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0072] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0073] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0074] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0075] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that: The electronic expansion valve comprises: A sleeve (10) having a blocking end and an open end, wherein the sleeve (10) has a receiving cavity (11) and a valve cavity (12), wherein the valve cavity (12) is arranged close to the open end, and a side wall of the sleeve (10) has a communication port (13), wherein the communication port (13) is in communication with the valve cavity (12), and the communication port (13) is used to communicate with a communication pipeline; A valve sleeve (20) and a valve core (30), wherein the valve sleeve (20) is arranged at the opening end, the valve sleeve (20) blocks the opening end, the valve sleeve (20) has a circulation channel, the circulation channel is communicated with the valve cavity (12), the valve core (30) is arranged on the valve sleeve (20), the valve core (30) has a valve port (31), and the valve cavity (12), the valve port (31) and the circulation channel are communicated with each other; A valve needle (40) is movably arranged in the sleeve (10); the valve needle (40) is arranged corresponding to the valve port (31); and the valve needle (40) can adjust the flow rate at the valve port (31).

2. The electronic expansion valve according to claim 1, characterized in that: The valve sleeve (20) comprises a fixed section (21) and a flow section (22) which are interconnected, a port of the fixed section (21) is fixedly connected to a port of the open end, the flow section (22) is located in the valve cavity (12), the flow section (22) comprises the flow channel, and the valve core (30) is arranged in the flow section (22).

3. The electronic expansion valve according to claim 2, characterized in that: The flow section (22) comprises a first step section (221) and a second step section (222) which are connected in sequence, the diameter of the first step section (221) is smaller than the diameter of the second step section (222), the second step section (222) is connected to the fixed section (21), a first step surface (223) is provided between the first step section (221) and the second step section (222), an end of the valve core (30) away from the opening end abuts against the first step surface (223), and an end of the valve core (30) close to the opening end abuts against the connecting pipeline, so as to fix the valve core (30) in the valve sleeve (20).

4. The electronic expansion valve according to claim 2, characterized in that: A circulation port (23) is provided on the side wall of the circulation section (22), and the circulation port (23) is located on a side of the valve core (30) away from the opening end, and the circulation channel is connected to the valve cavity (12) through the circulation port (23).

5. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises a guide sleeve (50), wherein the guide sleeve (50) is arranged in the sleeve (10), and a limiting structure is provided between the guide sleeve (50) and the sleeve (10), and a side of the guide sleeve (50) close to the valve port (31) abuts against the valve sleeve (20), and the axial position of the guide sleeve (50) in the sleeve (10) is fixed by the limiting structure and the valve sleeve (20).

6. The electronic expansion valve according to claim 5, characterized in that: The outer wall of the guide sleeve (50) is provided with a first limiting step (51) and a second limiting step (52) at intervals along the axis, the second limiting step (52) is provided close to the valve port (31), the second limiting step (52) abuts against a side of the valve sleeve (20) away from the opening end, the inner diameter of the accommodating cavity (11) is smaller than the inner diameter of the valve cavity (12), the connection between the accommodating cavity (11) and the valve cavity (12) has a second step surface (14), and the second step surface (14) cooperates with the first limiting step (51) for limiting.

7. The electronic expansion valve according to claim 6, characterized in that: The electronic expansion valve further comprises a limiting member (60), wherein the limiting member (60) is arranged between the guide sleeve (50) and the second stepped surface (14), one side of the limiting member (60) abuts against the first limiting step (51), and the other side of the limiting member (60) abuts against the second stepped surface (14).

8. The electronic expansion valve according to claim 7, characterized in that: The limiting member (60) comprises a pressing ring (61) and an elastic sheet (62), wherein the pressing ring (61) has a through hole, and the guide sleeve (50) is inserted into the through hole, and the elastic sheet (62) has a connecting end and a free end which are arranged opposite to each other, and the first end of the pressing ring (61) abuts against the second step surface (14), and the second end of the pressing ring (61) is connected to the connecting end, and the free end abuts against and cooperates with the first limiting step (51).

9. The electronic expansion valve according to claim 8, characterized in that: The limiting member (60) comprises a plurality of elastic sheets (62), which are arranged in an annular manner in the through hole, and there is an escape space between the free ends of the plurality of elastic sheets (62). The guide sleeve (50) is inserted in the escape space, and the elastic sheet (62) comprises a connecting section and an abutting section connected in sequence, and one end of the connecting section away from the abutting section forms the connecting end, and the connecting section extends in a direction close to the first end, and the abutting section extends along an axial direction close to the guide sleeve (50), and the abutting section cooperates and abuts with the end face of the first limiting step (51).

10. The electronic expansion valve according to claim 1, characterized in that: The sleeve (10) and / or the valve sleeve (20) are formed by a stretching process.

11. The electronic expansion valve according to claim 5, characterized in that: The electronic expansion valve further comprises a rotation-stopping structure, which is arranged between the guide sleeve (50) and the valve sleeve (20), and is used to limit the guide sleeve (50) from rotating relative to the valve sleeve (20).

12. The electronic expansion valve according to claim 11, characterized in that: The anti-rotation structure includes an anti-rotation protrusion (53) and an anti-rotation hole (24), wherein the anti-rotation protrusion (53) is arranged on the guide sleeve (50), and the anti-rotation protrusion (53) is not located on the axis of the guide sleeve (50), and the anti-rotation hole (24) is arranged on the valve sleeve (20), and the anti-rotation protrusion (53) is inserted into the anti-rotation hole (24), and the anti-rotation protrusion (53) cooperates with the anti-rotation hole (24) to limit the rotation of the guide sleeve (50) relative to the valve sleeve (20).

13. The electronic expansion valve according to claim 12, characterized in that: The guide sleeve (50) comprises a first connecting section (55) and a second connecting section (54) connected in sequence, the outer diameter of the first connecting section (55) is larger than the outer diameter of the second connecting section (54), the end of the valve sleeve (20) away from the opening end has a first mounting hole (25), the second connecting section (54) is inserted into the first mounting hole (25), the side wall of the second connecting section (54) is provided with the anti-rotation protrusion (53), the anti-rotation hole (24) is located at the end of the valve sleeve (20) away from the opening end, and is connected to the first mounting hole (25).

14. The electronic expansion valve according to claim 13, characterized in that: The anti-rotation structure comprises a plurality of anti-rotation protrusions (53) and a plurality of anti-rotation holes (24); the plurality of anti-rotation protrusions (53) are arranged at annular intervals on the side wall of the second connecting section (54); and the anti-rotation holes (24) are arranged in a one-to-one correspondence with the anti-rotation protrusions (53).

15. The electronic expansion valve according to claim 2, characterized in that: The electronic expansion valve further comprises a connecting pipe (80) and a welding ring (70); one end of the connecting pipe (80) is inserted into the valve sleeve (20); the connecting pipe (80) is located on a side of the valve core away from the valve needle (40); the welding ring (70) is arranged between the connecting pipe (80) and the valve sleeve (20); and the connecting pipe (80) is welded to the valve sleeve (20) via the welding ring (70).

16. The electronic expansion valve according to claim 15, characterized in that: The diameter of the fixed section (21) is greater than the diameter of the circulation section (22); the connecting pipe (80) is inserted into the circulation section (22); and the welding ring (70) is located between the circulation section (22) and the side wall of the connecting pipe (80).

17. The electronic expansion valve according to claim 16, characterized in that: There is a gap between the inner wall of the connection between the flow section (22) and the fixed section (21) and the side wall of the connecting pipe (80), and the welding ring (70) is located in the gap.

18. The electronic expansion valve according to claim 16, characterized in that: The connection between the fixed section (21) and the flow section (22) is an arc transition.

19. A method for processing an electronic expansion valve, characterized in that: The electronic expansion valve is the electronic expansion valve according to claims 1 to 18, and the processing method comprises: Step 1: fix the valve needle (40) in the sleeve (10), and fix the valve core (30) on the valve sleeve (20); Step 2: fix the valve sleeve (20) to the open end of the sleeve (10), and insert the valve core (30) into the valve sleeve (20) accordingly.

20. The processing method according to claim 19, characterized in that: The electronic expansion valve further comprises a guide sleeve (50) and a stopper (60). After the valve needle (40) is fixed in the sleeve (10), the processing method further comprises: The limiting member (60) is arranged in the sleeve (10) so that one side of the limiting member (60) abuts against the inner wall of the sleeve (10); The guide sleeve (50) is threadably connected to the valve needle (40), and one side of the guide sleeve (50) is brought into contact with the other side of the stopper (60); Wherein, the step 2 further comprises abutting one end of the valve sleeve (20) located on the sleeve (10) against a side of the guide sleeve (50) away from the limiting member (60).

21. The processing method according to claim 19, characterized in that: The electronic expansion valve further comprises a connecting pipe (80) for fixing the valve core (30) on the valve sleeve (20), which specifically comprises: Placing the valve core (30) in the valve sleeve (20), and making one side of the valve core (30) abut against the inner wall of the valve sleeve (20); One end of the connecting pipe (80) is inserted into the valve sleeve (20) and abuts against the other side of the valve core (30); The connecting pipe (80) is fixed to the valve sleeve (20) by welding.

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