Electronic expansion valve and manufacturing method therefor

Abstract

Provided are an electronic expansion valve and a manufacturing method therefor. The electronic expansion valve comprises: a casing (10), provided with a sealed end and an open end, wherein the casing (10) is internally provided with an accommodation cavity (11) and a valve cavity (12), the valve cavity (12) is arranged close to the open end, a side wall of the casing (10) is provided with a communication port (13), the communication port (13) is communicated with the valve cavity (12), and the communication port (13) allows for communication with communicated piping; a valve sleeve (20) and a valve core (30), wherein the valve sleeve (20) is arranged at the open end, the valve sleeve (20) seals the open end, the valve sleeve (20) is provided with a flow channel, the flow channel is communicated with the valve cavity (12), the valve core (30) is arranged on the valve sleeve (20), the valve core (30) is provided with a valve port (31), and the valve cavity (12), the valve port (31) and the flow channel are communicated with each other; and a valve needle (40), which is movably arranged in the casing (10), wherein the valve needle (40) is arranged corresponding to the valve port (31), and the valve needle (40) can adjust the amount of flow at the valve port (31). The invention can solve the problem of the low installation efficiency of electronic expansion valves in the prior art.

Description

Electronic expansion valve and processing method thereof

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on September 29, 2023, with application number 202311296164.9 and titled “Electronic Expansion Valve and Processing Method Thereof”. Technical Field

[0002] The present application relates to the technical field of control valves, and in particular to an electronic expansion valve and a processing method thereof. Background Art

[0003] Conventional electronic expansion valves primarily consist of 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, and the valve seat and sleeve together accommodate the valve needle and guide sleeve. The valve seat has a valve port, and the valve needle can cooperate with the guide sleeve to move closer to or further away from the valve port to adjust the flow rate of the fluid at the valve port. During assembly, conventional electronic expansion valves require first securing the valve needle and guide sleeve within the valve cavity and receiving cavity, respectively, and then securing the valve seat and sleeve to complete the assembly. This design makes the assembly process of the electronic expansion valve cumbersome and results in low production efficiency.

[0004] Summary of the Invention

[0005] The present application provides an electronic expansion valve and a processing method thereof to solve the problem of low installation efficiency of electronic expansion valves in the prior art.

[0006] According to one aspect of the present application, an electronic expansion valve is provided, 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 circulation channel, the circulation 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 circulation 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 capable of adjusting the flow at the valve port.

[0007] By applying the technical solution of the present application, 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 place 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 arranged separately, 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.

[0008] Furthermore, the valve sleeve has a fixed section and a flow section that are interconnected, the port of the fixed section is fixedly connected to the 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.

[0009] Furthermore, the flow 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, and a first step surface is provided between the first step section and the second step section, the end of the valve core away from the opening end abuts against the first step surface, and the end of the valve core close to the opening end abuts against the connecting pipe to fix the valve core in the valve sleeve.

[0010] Furthermore, a flow port is provided on the side wall of the flow section, and the flow port is located on a side of the valve core away from the opening end, and the flow channel is communicated with the valve cavity through the flow port.

[0011] Furthermore, the electronic expansion valve also includes a guide sleeve, which is arranged in the sleeve. 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, and the axial position of the guide sleeve in the sleeve is fixed by the limiting structure and the valve sleeve.

[0012] 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, and the second limiting step abuts against 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.

[0013] Furthermore, the electronic expansion valve further includes a limiter, which is arranged between the guide sleeve and the second stepped surface, with one side of the limiter abutting against the first limit step and the other side of the limiter abutting against the second stepped surface.

[0014] 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 relatively arranged, 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 and cooperates with the first limiting step.

[0015] Furthermore, the limiting member includes a plurality of elastic sheets, which are arranged in a ring-shaped manner in the through hole, and there is an avoidance space between the free ends of the plurality of elastic sheets. The guide sleeve is inserted into the avoidance space. The elastic sheet has a connecting section and an abutting section connected in sequence. The connecting section forms a connecting end away from one end of the abutting section. 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. The abutting section cooperates and abuts with the end face of the first limiting step.

[0016] Furthermore, a limiting protrusion is provided on the side wall of the guide sleeve, and the limiting protrusion is penetrated into the avoidance space to limit the relative rotation of the elastic sheet and the guide sleeve in the circumferential direction.

[0017] Furthermore, the sleeve and / or the valve sleeve are formed by a stretching process.

[0018] Furthermore, the electronic expansion valve further includes a first anti-rotation 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.

[0019] Furthermore, the first 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 hole is arranged on the valve sleeve. The anti-rotation protrusion is passed through the anti-rotation hole. The anti-rotation protrusion cooperates with the anti-rotation hole to limit the rotation of the guide sleeve relative to the valve sleeve.

[0020] 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, and 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.

[0021] Furthermore, the first anti-rotation structure includes a plurality of anti-rotation protrusions and a plurality of anti-rotation holes. 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 in a one-to-one correspondence with the anti-rotation protrusions.

[0022] Furthermore, the electronic expansion valve also includes a connecting pipe, one end of which is inserted into the valve sleeve, the connecting pipe is located on a side of the valve core away from the valve needle, and the connecting pipe is fixed to the valve sleeve by welding.

[0023] Furthermore, the diameter of the fixed section is larger than the diameter of the flow section, and the connecting pipe is passed through the flow section.

[0024] 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 material for welding the connecting pipe and the valve sleeve is located in the gap.

[0025] Furthermore, the connection between the fixed section and the flow section is an arc transition.

[0026] Furthermore, the electronic expansion valve further includes a rotor assembly, which is fixedly connected to the valve needle to drive the valve needle to move relative to the valve port.

[0027] Furthermore, the rotor assembly includes a rotor connecting plate and a fixing member, the fixing member is arranged between the valve needle and the rotor connecting plate, the valve needle is connected to the rotor connecting plate through the fixing member, a fixing hole is provided on the rotor connecting plate, the fixing member is sleeved on the outside of the valve needle and is provided in the fixing hole, and a second anti-rotation structure is provided between the fixing member and the fixing hole to limit the relative rotation of the valve needle and the rotor connecting plate.

[0028] Furthermore, the rotor assembly also includes a magnetic rotor, a rotor connecting plate and a stopping mechanism. The magnetic rotor is sleeved on the outside of the rotor connecting plate. The magnetic rotor has a rotor cavity. At least part of the stopping mechanism is located in the rotor cavity. A guide rod is also provided on the rotor connecting plate. The guide rod cooperates with the stopping mechanism to limit the axial movement of the magnetic rotor.

[0029] According to another aspect of the present application, an electronic expansion valve is provided, which includes: 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, and the connecting port being used to connect with a connecting pipeline; a valve seat core, the valve seat core being arranged at the open end, the valve seat core blocking the open end, the valve seat core having a valve port, the valve chamber and the valve port being connected to each other; a valve needle, movably arranged in the sleeve, the valve needle being arranged corresponding to the valve port, and the valve needle being capable of adjusting the flow at the valve port.

[0030] Furthermore, the electronic expansion valve also includes a guide sleeve, which is arranged in the sleeve, and the end surface of the guide sleeve close to the opening end abuts against the valve seat core. A flow hole is provided on the side wall of the guide sleeve, and the valve cavity and the valve port are connected through the flow hole.

[0031] Furthermore, a limiting boss is provided on the end surface of the valve seat core close to the guide sleeve, and the guide sleeve is arranged on the outside of the limiting boss to limit the relative displacement of the guide sleeve relative to the valve seat core in the radial direction.

[0032] Furthermore, the electronic expansion valve also includes a limiter, which is fixedly arranged between the guide sleeve and the sleeve, and one side of the limiter abuts against the side of the guide sleeve away from the valve seat core to limit the displacement of the guide sleeve away from the opening end.

[0033] 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 relatively arranged, the first end of the pressure ring abuts against the inner wall of the sleeve, the second end of the pressure ring is connected to the connecting end, and the free end abuts and cooperates with the guide sleeve.

[0034] Furthermore, the limiting member includes a plurality of elastic sheets, which are arranged in a ring-shaped manner in the through hole, and there is an avoidance space between the free ends of the plurality of elastic sheets. The guide sleeve is inserted into the avoidance space. The elastic sheet has a connecting section and an abutting section connected in sequence. The connecting section forms a connecting end away from one end of the abutting section. 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. The abutting section cooperates with and abuts the guide sleeve.

[0035] According to another aspect of the present application, a processing method of an electronic expansion valve is provided, wherein the electronic expansion valve is the above-mentioned electronic expansion valve, and the processing method includes: fixing the valve core on the valve sleeve; fixing the valve sleeve on the open end of the sleeve to seal the open end of the sleeve.

[0036] Furthermore, the electronic expansion valve also includes a guide sleeve and a limit member, and the processing method also includes: before fixing the valve sleeve to the open end of the sleeve, installing the limit member in the sleeve so that one side of the limit member abuts against the inner wall of the sleeve; installing the guide sleeve so that one side of the guide sleeve abuts against the other side of the limit member; wherein, the step of fixing the valve sleeve to the open end of the sleeve also includes: abutting one end of the valve sleeve located on the sleeve against the side of the guide sleeve away from the limit member.

[0037] Furthermore, the sleeve and / or valve sleeve are integrally formed by a stretching process, the sleeve forms an accommodating cavity and a valve cavity, the valve sleeve forms an installation cavity, the rotor assembly is located in the accommodating cavity, the valve needle is located in the accommodating cavity and the valve cavity, and the valve core is located in the installation cavity.

[0038] Furthermore, the electronic expansion valve also includes a connecting pipe, and the step of fixing the valve core on the valve sleeve also includes: 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; passing one end of the connecting pipe through the valve sleeve and abutting against the other side of the valve core; and welding the connecting pipe to the valve sleeve.

[0039] According to the technical solution provided in the present application, 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 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.

[0040] According to another aspect of the present application, a processing method for an electronic expansion valve is provided. The electronic expansion valve also includes a guide sleeve and a limit member. The processing method includes: fixing the guide sleeve and the limit member in the sleeve, with one side of the limit member abutting against the inner wall of the sleeve; abutting one side of the guide sleeve against the other side of the limit member; fixing the valve seat core at the open end of the sleeve to seal the open end of the sleeve.

[0041] Furthermore, the electronic expansion valve also includes a rotor assembly, which is driven by the valve needle. The sleeve is integrally formed by a stretching process to form an accommodating cavity and a valve cavity. The rotor assembly is located in the accommodating cavity, the valve needle is located in the accommodating cavity and the valve cavity, and the valve seat core is located in the valve cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0043] FIG1 shows a schematic structural diagram of an electronic expansion valve provided by one or more embodiments of the present application;

[0044] FIG2 shows a schematic structural diagram of a valve sleeve and a valve core provided by one or more embodiments of the present application;

[0045] FIG3 shows a schematic structural diagram of a guide sleeve provided by one or more embodiments of the present application;

[0046] FIG4 is a schematic structural diagram of a position limiting member provided by one or more embodiments of the present application;

[0047] FIG5 shows a cross-sectional view of a position limiting member provided by one or more embodiments of the present application;

[0048] FIG6 shows a top view of a valve sleeve provided by one or more embodiments of the present application;

[0049] FIG7 shows a top view of a guide sleeve provided in one or more embodiments of the present application;

[0050] FIG8 shows a schematic structural diagram of a rotor assembly provided by one or more embodiments of the present application;

[0051] FIG9 is a schematic structural diagram of a fixing member provided by one or more embodiments of the present application;

[0052] FIG10 is a schematic diagram showing the structure of the cooperation between the fixing member and the guide sleeve provided in one or more embodiments of the present application;

[0053] FIG11 shows a schematic structural diagram of an electronic expansion valve provided in yet another embodiment of the present application.

[0054] The above drawings include the following reference numerals: 10, sleeve; 11, accommodating chamber; 12, valve chamber; 13, communicating port; 14, second stepped surface; 20, valve sleeve; 21, fixed section; 22, flow section; 221, first stepped section; 222, second stepped section; 223, first stepped surface; 23, flow port; 24, anti-rotation hole; 25, first mounting hole; 30, valve core; 31, valve port; 40, valve needle; 50, guide sleeve; 51, first limiting step; 52, second limiting step; 53, anti-rotation protrusion; 54, second connecting section; 55, first connecting section; 56, limiting protrusion; 57, flow hole; 60, limiting member; 61, pressure ring; 62, elastic sheet; 70, welding ring; 80, connecting pipe; 90. Rotor assembly; 91. Magnetic rotor; 911. Rotor cavity; 92. Rotor connecting plate; 921. Fixing hole; 922. Guide rod; 93. Fixing piece; 931. Section structure; 94. Stop mechanism; 100. Valve seat core; 110. Limiting boss. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0056] As shown in Figures 1 and 2, according to one aspect of the present application, an electronic expansion valve is provided. The electronic expansion valve includes a sleeve 10, a valve sleeve 20, a valve core 30, and a valve needle 40. The sleeve 10 has a blocked end and an open end. The sleeve 10 includes a housing chamber 11 and a valve chamber 12. The valve chamber 12 is located near the open end. The sidewall of the sleeve 10 includes a communication port 13, which communicates with the valve chamber 12 and is used to communicate with a connecting pipeline. The valve sleeve 20 is located at the open end and blocks the open end. The valve sleeve 20 has a flow channel that communicates with the valve chamber 12. The valve core 30 is located on the valve sleeve 20 and has a valve port 31. The valve chamber 12, the valve port 31, and the flow channel are interconnected. The valve needle 40 is movably disposed within the sleeve 10. The valve needle 40 is disposed corresponding to the valve port 31 and can adjust the flow rate at the valve port 31.

[0057] Applying the technical solution of the present application, 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 place 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 valve chamber 12, compared with the traditional technical solution in which the sleeve and the valve seat are arranged separately, 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.

[0058] 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, thereby ensuring 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 entire 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.

[0059] 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.

[0060] As shown in Figures 1 and 2, the flow 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. 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 near the opening end abuts against the connecting pipe 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, and the end of the valve core 30 near the opening end and the connecting pipe can limit the position of the valve seat toward the opening end. The first step surface 223 cooperates with the connecting pipe to limit the position of the valve core 30, 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 disassembly and assembly of the valve core 30.

[0061] Furthermore, a circulation port 23 is provided on the side wall of the circulation section 22, and the circulation port 23 is located on the side of the valve core 30 away from the open end, and the circulation channel is connected to the valve cavity 12 through the circulation port 23. Through the above arrangement, the refrigerant fluid in the valve cavity 12 can enter the circulation channel through the circulation port 23, thereby realizing the communication between the circulation channel and the valve cavity 12. Specifically, in the present application, a plurality of circulation ports 23 are provided, and the plurality of circulation ports 23 are arranged at annular intervals, so as to ensure that the refrigerant fluid flow in the circulation channel is sufficient and prevent the circulation port 23 from throttling the refrigerant fluid. Specifically, the number of the circulation ports 23 can be 3, 4 or 5, as long as the refrigerant fluid can enter the circulation channel normally.

[0062] As shown in FIG3 , the electronic expansion valve further comprises a guide sleeve 50, which is disposed within the sleeve 10. The valve needle 40 has an external threaded section, and the guide sleeve 50 has an internal threaded section. The valve needle 40 and the guide sleeve 50 are threadedly engaged to adjust the distance relative to the valve port 31. A limiting structure is provided between the guide sleeve 50 and the sleeve 10. The side of the guide sleeve 50 near the valve port 31 abuts against the valve sleeve 20. The valve needle 40 is sequentially inserted into the guide sleeve 50 and the valve sleeve 20. The axial position of the guide sleeve 50 within 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 within the sleeve 10 by 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 regulating 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, improving the overall installation efficiency of the device.

[0063] 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 near the valve port 31 and 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. The connection between the accommodating chamber 11 and the valve chamber 12 is provided with a second stepped surface 14, which cooperates with the first limiting step 51 to limit the position. Through the above arrangement, the second stepped surface 14 can limit the position of the guide sleeve 50 near the blocking end, thereby achieving an upper limit on the guide sleeve 50, preventing the guide sleeve 50 from axially displacing toward the blocking end under the drive of the valve needle 40, and ensuring the accuracy of the threaded fit between the valve needle 40 and the guide sleeve 50.

[0064] In a specific embodiment of the present application, the electronic expansion valve further includes a stopper 60, which is disposed between the guide sleeve 50 and the second stepped surface 14. One side of the stopper 60 abuts the first stopper step 51, and the other side of the stopper 60 abuts the second stepped surface 14. By virtue of the above arrangement, the stopper 60 is disposed between the guide sleeve 50 and the second stepped surface 14, thereby preventing friction between the guide sleeve 50 and the second stepped surface 14, which could cause wear between the first stopper step 51 and the second stepped surface 14 of the guide sleeve 50 and thus deformation of the guide sleeve 50 or the sleeve 10, thereby improving the service life and stability of the electronic expansion valve. The provision of the stopper 60 facilitates the limited installation of the guide sleeve 50.

[0065] As shown in Figures 4 and 5, the limiting member 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 relatively arranged. The first end of the pressure ring 61 abuts 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 limiting step 51. Through the above arrangement, the pressure ring 61 is annular, and the first end of the pressure ring 61 abuts the second step surface 14, which can ensure that the force exerted by the pressure ring 61 on the second step surface 14 is relatively balanced, preventing the pressure ring 61 from being subjected to uneven circumferential force after abutting the second step surface 14, causing the limiting member 60 to deflect, further preventing the guide sleeve 50 from being displaced in the sleeve 10, and ensuring the stability of the electronic expansion valve during operation.

[0066] 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 manner in the through hole. There is an escape space between the free ends of the plurality of elastic sheets 62, and the guide sleeve 50 is inserted into the escape space. The elastic sheet 62 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, and the abutting section extends along the axial direction close to the guide sleeve 50. The abutting section cooperates with the end face of the first limiting 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 refrigerant fluid impacting the guide sleeve 50, 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.

[0067] As shown in FIG7 , a limiting protrusion 56 is provided on the side wall of the guide sleeve 50. The limiting protrusion 56 is provided in the avoidance space and is used to limit the relative rotation of the elastic piece 62 and the guide sleeve 50 in the circumferential direction, thereby ensuring the stability of the guide sleeve 50 and the limiting member 60 when they are arranged in the sleeve 10. Specifically, a plurality of limiting protrusions 56 can be provided in an annular shape on the side wall of the guide sleeve 50, and the plurality of limiting protrusions 56 are provided in a one-to-one correspondence with the plurality of avoidance spaces, or the plurality of limiting protrusions 56 are provided in a one-to-one correspondence with part of the avoidance spaces.

[0068] In a specific embodiment of the present application, the sleeve 10 and 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 valve sleeve 20 during the forming process, ensuring the accuracy of the flow adjustment of the electronic expansion valve.

[0069] In another embodiment of the present application, the sleeve 10 or the valve sleeve 20 is formed by a stretching process. This configuration can reduce the overall processing cost of the electronic expansion valve while also reducing the tolerances of the sleeve 10 and the valve sleeve 20 during the forming process, thereby ensuring the performance of the electronic expansion valve.

[0070] In a specific embodiment of the present application, the electronic expansion valve further includes a first anti-rotation structure disposed between the guide sleeve 50 and the valve sleeve 20. The first anti-rotation structure is used to limit the rotation of the guide sleeve 50 relative to the valve sleeve 20. By providing a stop structure between the guide sleeve 50 and the valve sleeve 20, the guide sleeve 50 is prevented from rotating relative to the valve sleeve 20 during movement with the valve needle 40, thereby preventing the guide sleeve 50 from rotating relative to the valve sleeve 20, thereby affecting the accuracy of the valve needle 40 in regulating the flow rate at the valve port 31.

[0071] As shown in Figures 3 and 6, the first anti-rotation structure includes an anti-rotation protrusion 53 and an anti-rotation hole 24. The anti-rotation protrusion 53 is provided on the guide sleeve 50, and the anti-rotation hole 24 is provided on the valve sleeve 20. The anti-rotation protrusion 53 is inserted into 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 this 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. This ensures that the guide sleeve 50 can stably guide the valve needle 40 during operation of the electronic expansion valve, thereby improving the performance of the electronic expansion valve.

[0072] 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 passed through the first mounting hole 25. The first mounting hole 25 can prevent the guide sleeve 50 from being stable when being impacted by the refrigerant fluid, and no abnormal shaking will occur, which will cause the valve needle 40 and the guide sleeve 50 to fail to cooperate. 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, which can make the guide sleeve 50 abut against the end of the valve sleeve 20 away from the open end, and play an axial limiting role on the guide sleeve 50. The anti-rotation protrusion 53 cooperates with the anti-rotation hole 24, and can play a circumferential limiting role on the guide sleeve 50. 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.

[0073] Among them, in other embodiments, the anti-rotation protrusion 53 can also be set on the end face of the first connecting section 55, and the anti-rotation hole 24 is set on the end face of the valve sleeve 20 close to one end of the guide sleeve 50. The anti-rotation protrusion 53 and the anti-rotation hole 24 can also cooperate to achieve circumferential limitation of the guide sleeve 50.

[0074] Furthermore, the first anti-rotation structure includes 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. Through the above arrangement, the plurality of anti-rotation protrusions 53 and the anti-rotation holes 24 cooperate to enhance the circumferential limiting effect of the limiting structure, ensuring the limiting function of the limiting structure. The plurality of anti-rotation protrusions 53 are arranged at circumferential intervals 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 the guide sleeve 50 when 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.

[0075] As shown in Figure 2, the electronic expansion valve also includes a connecting tube 80 and a welding ring 70. One end of the connecting tube 80 is inserted into the valve sleeve 20. The connecting tube 80 is located on the side of the valve core 30 away from the valve needle 40. The welding ring 70 is disposed between the connecting tube 80 and the valve sleeve 20, and the connecting tube 80 is welded to the valve sleeve 20 via the welding ring 70. Through this arrangement, the welding ring 70 can improve the connection performance between the connecting tube 80 and the valve sleeve 20, prevent the connecting tube 80 from falling out of the valve sleeve 20, ensure that the connecting tube 80 retains the valve core 30, and enhance the stability of the electronic expansion valve operation. In addition, the provision of the welding ring 70 can seal the gap between the connecting tube 80 and the valve sleeve 20, thereby improving the sealing performance of the entire device.

[0076] Specifically, in the present application, the diameter of the fixed section 21 is larger than the diameter of the flow section 22, the connecting tube 80 is disposed within the flow section 22, and the welding ring 70 is located between the flow section 22 and the sidewall of the connecting tube 80. Through the above arrangement, the diameter of the fixed section 21 is larger than the diameter of the flow section 22, which ensures that there is sufficient space within the valve cavity for the circulation of the refrigerant fluid. It also reduces the volume of the valve core 30 and the overall manufacturing cost of the electronic expansion valve. By arranging the welding ring 70 between the flow section 22 and the sidewall of the connecting tube 80, the welding area between the flow section 22 and the connecting tube 80 is increased, thereby improving the welding strength between the connecting tube and the valve sleeve 20 and thereby enhancing the reliability of the electronic expansion valve.

[0077] Furthermore, a gap is defined 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 positioned within the gap. This arrangement facilitates securing the welding ring 70 during welding of the connecting pipe 80 and the valve sleeve 20, ensuring uniform contact between the welding ring 70 and the inner wall of the connection between the flow section 22 and the fixed section 21, as well as the side wall of the connecting pipe 80. This further ensures the quality of the welding process and reduces the possibility of cracks forming in the weld.

[0078] In a specific embodiment of the present application, the connection between the fixed section 21 and the flow section 22 is an arc transition. This arrangement can improve the connection strength between the fixed section 21 and the flow section 22, and can facilitate the stretching and forming of the valve sleeve 20, reduce production difficulty, and improve production efficiency.

[0079] Specifically, in the present application, the electronic expansion valve further includes a rotor assembly 90, which includes a fixedly connected magnetic rotor 91 and a rotor connecting plate 92. The magnetic rotor 91 is rotatably disposed in the accommodating chamber 11 and is sleeved on the exterior of the rotor connecting plate 92. The rotor connecting plate 92 is fixedly connected to the valve needle 40 to drive the valve needle 40 to rotate. Through the above arrangement, the electromagnetic coil can cooperate with the magnetic rotor 91 to drive the entire rotor assembly 90 to rotate, thereby driving the valve needle 40 to rotate. A threaded structure is also provided between the guide sleeve 50 sleeved on the exterior of the valve needle 40 and the valve needle 40. By cooperating with the guide sleeve 50, the valve needle 40 can convert axial rotation into linear motion, thereby achieving movement of the valve needle 40 relative to the valve port 31 to adjust the flow rate at the valve port 31.

[0080] Specifically, as shown in Figures 8 and 9, the rotor assembly 90 further includes a fixing member 93, which is disposed between the valve needle 40 and the rotor connecting plate 92. The valve needle 40 is connected to the rotor connecting plate 92 via the fixing member 93. The fixing member 93 is used to limit the relative rotation between the valve needle 40 and the rotor connecting plate 92. Through this arrangement, the cooperation between the fixing member 93 and the fixing hole 921 further limits the relative movement of the valve needle 40 and the rotor connecting plate 92, thereby improving the stability of the connection between the valve needle 40 and the rotor connecting plate 92 and enhancing the accuracy of the operation of the electronic expansion valve.

[0081] Furthermore, the valve needle 40 is welded to the fixing member 93. This arrangement allows for a tighter connection between the valve needle 40 and the fixing member 93 through welding, eliminating the need for other fasteners. This facilitates operation and allows the valve needle 40 to simultaneously drive the fixing member 93 in rotation, thereby reducing rotational error between the valve needle 40 and the fixing member 93. In a specific embodiment of the present application, the valve needle 40 is made of metal, and the fixing member 93 is made of engineering plastic. Laser welding is used to connect the valve needle 40 and the fixing member 93, minimizing the heat-affected zone during welding, reducing the effects of heat on the valve needle 40, and ensuring the precision of the connection between the valve needle 40 and the fixing member 93.

[0082] In a specific embodiment of the present application, as shown in FIG8 , a fixing hole 921 is provided on the rotor connecting plate 92. A fixing member 93 is disposed outside the valve needle 40 and within the fixing hole 921. A second anti-rotation structure is provided between the fixing member 93 and the fixing hole 921 to limit relative rotation between the valve needle 40 and the rotor connecting plate 92. Specifically, a cutout structure 931 is provided on the sidewall of the fixing member 93. The inner wall shape of the fixing hole 921 matches the outer circumference of the fixing member 93 to limit rotation of the valve needle 40 relative to the rotor connecting plate 92. The fixing member 93 and the fixing hole 921 cooperate to form the second anti-rotation structure. By providing the cutout structure 931 on the fixing member 93 and matching the inner wall shape of the fixing hole 921 with the outer circumference of the fixing member 93, the fixing member 93 and the rotor connecting plate 92 are circumferentially limited, further improving the accuracy of the electronic expansion valve operation. Furthermore, the structural design of the cutout structure 931 facilitates the processing of the fixing member 93.

[0083] In some other embodiments of the present application, the fixing member 93 is integrally formed with the rotor connecting plate 92. Through the above arrangement, the connection performance of the fixing member 93 and the rotor connecting plate 92 is improved, the circumferential rotation of the valve needle 40 relative to the rotor connecting plate 92 is better limited, the fixing effect on the valve needle 40 is more stable, and the fixing member 93 is prevented from loosening when the valve needle 40 rotates. In a specific embodiment of the present application, the fixing member 93 and the rotor connecting plate 92 are both made of engineering plastics, which have good heat resistance, cold resistance, machinability and structural stability. The fixing member 93 and the rotor connecting plate 92 are an injection-molded integral structure, which facilitates the production and processing of the fixing member 93. The fixing member 93 and the rotor connecting plate 92 processed by the injection molding process have high matching accuracy and relatively low manufacturing cost, while improving the overall structural strength of the rotor assembly 90.

[0084] In a specific embodiment of the present application, the electronic expansion valve further includes a stop mechanism 94, and the rotor assembly 90 further includes a rotor connecting plate 92 and a guide rod 922. The guide rod 922 engages with the stop mechanism 94 in a stoppered manner. The rotor assembly further includes a magnetic rotor 91. The magnetic rotor 91 has a rotor cavity 911, and the stop mechanism 94 is partially located within the rotor cavity 911. Specifically, the end of the stop mechanism 94 distal to the valve sleeve 20 is fixed to the sealing end of the sleeve 10, and at least a portion of the stop mechanism 94 proximal to the valve sleeve 20 is located within the rotor cavity 911. Specifically, the stop mechanism 94 includes a spiral guide rail, on which a retaining ring is disposed, which abuts against the guide rod 922. During rotation, the guide rod 922 can push the retaining ring to move axially along the spiral guide rail. The stop mechanism 94 includes an upper limit mechanism and a lower limit mechanism. During axial movement, the retaining ring abuts against the upper limit mechanism or the lower limit mechanism, respectively, to provide a stop, thereby limiting the axial travel of the magnetic rotor 91. By partially locating the stop mechanism 94 in the rotor cavity 911, the internal space of the sleeve 10 can be fully utilized, further reducing the volume of the electronic expansion valve. The guide rod 922 is arranged on the rotor connecting plate 92, and the two can be separately arranged or integrally arranged.

[0085] In another embodiment of the present application, as shown in Figure 10, the electronic expansion valve also includes a stopping mechanism 94, the rotor assembly 90 includes a fixedly connected magnetic rotor 91 and a rotor connecting plate 92, the magnetic rotor 91 is rotatably disposed in the accommodating chamber 11, the magnetic rotor 91 is sleeved on the outside of the rotor connecting plate 92, the rotor connecting plate 92 is fixedly connected to the valve needle 40 to drive the valve needle 40 to rotate, the stopping mechanism 94 has a spiral guide rail, and the spiral guide rail is arranged on the outer wall of the guide sleeve 50, the rotor assembly also includes a guide rod 922, and the guide rod 922 is engaged with the stopping mechanism 94. Specifically, a retaining ring is rotatably provided on the spiral guide rail, and the retaining ring abuts against the guide rod 922. The guide rod 922 can push the retaining ring to move along the extension direction of the spiral guide rail during rotation. The end of the spiral guide rail has a limiting mechanism. When the retaining ring moves to the limiting mechanism and cannot continue to move, the retaining ring can limit the rotation of the guide rod 922 to achieve the upper and lower limits of the valve needle 40 and limit the movement range of the valve needle 40. The guide rod 922 is set on the rotor connecting plate 92, and the two can be set separately or as an integrated whole.

[0086] As shown in FIG11 , according to the technical solution of the present application, an electronic expansion valve is also provided, which includes a sleeve 10, a valve seat core 100, and a valve needle 40. The sleeve 10 has a blocked end and an open end, and a housing chamber 11 and a valve chamber 12 are provided in the sleeve 10. The valve chamber 12 is arranged near the open end, and 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 connect to a connecting pipeline. The valve seat core 100 is arranged at the open end, blocks the open end, and has a valve port 31. The valve chamber 12 and the valve port 31 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.

[0087] By applying the technical solution of the present application, when assembling the electronic expansion valve, it is only necessary to place the valve needle 40 into the sleeve 10 and then use the valve seat core 100 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. This can reduce the assembly process and improve production efficiency. Compared with the solution using a split valve sleeve 20 and valve core 30, by providing an integrated valve seat core 100, the number of overall parts of the electronic expansion valve can be reduced, further facilitating the assembly of the electronic expansion valve and improving assembly efficiency.

[0088] Specifically, the electronic expansion valve also includes a guide sleeve 50, which is disposed within the sleeve 10. The end surface of the guide sleeve 50 near the open end abuts the valve seat core 100. A flow hole 57 is provided on the sidewall of the guide sleeve 50, connecting the valve cavity 12 and the valve port 31. This arrangement allows fluid at the valve port 31 to flow into the valve cavity 12 through the flow hole 57, achieving fluid circulation. The abutment between the guide sleeve 50 and the valve seat core 100 limits axial movement of the guide sleeve 50, ensuring its stable installation within the sleeve 10.

[0089] Specifically, a limiting boss 110 is provided on the end surface of the valve seat core 100 near the guide sleeve 50. The guide sleeve 50 is mounted on the outside of the limiting boss 110 to limit radial displacement of the guide sleeve 50 relative to the valve seat core 100. This configuration prevents radial movement of the guide sleeve 50, ensuring the stability of the guide sleeve 50 and, consequently, the effective fit between the valve needle 40 and the guide sleeve 50.

[0090] Furthermore, the electronic expansion valve includes a stopper 60, which is fixedly disposed between the guide sleeve 50 and the sleeve 10. One side of the stopper 60 abuts against the side of the guide sleeve 50 facing away from the valve seat core 100, thereby limiting the displacement of the guide sleeve 50 away from the open end. Through this arrangement, the stopper 60 and the guide sleeve 50 cooperate to jointly limit the axial displacement of the guide sleeve 50 within the sleeve 10, preventing relative movement between the guide sleeve 50 and the valve needle 40. This ensures stable movement of the valve needle 40 and the accuracy of the electronic expansion valve in regulating flow.

[0091] Specifically, the stopper 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 disposed in the through hole. The elastic sheet 62 has a connecting end and a free end that are oppositely disposed. The first end of the pressure ring 61 abuts the inner wall of the sleeve 10, the second end of the pressure ring 61 is connected to the connecting end, and the free end abuts and cooperates with the guide sleeve 50. Through this arrangement, the elastic sheet 62 can further prevent the guide sleeve 50 from moving within the sleeve 10, ensuring the stability of the electronic expansion valve during operation.

[0092] Specifically, the limiting member 60 includes a plurality of elastic sheets 62, which are annularly spaced and arranged within the through hole. A clearance space is defined between the free ends of the plurality of elastic sheets 62, and the guide sleeve 50 is inserted into the clearance space. The elastic sheet 62 includes a connecting section and an abutting section, which are sequentially connected. The connecting section is distal to the abutting section at one end to form a connecting end. The connecting section extends toward the first end, and the abutting section extends along the axis of the guide sleeve 50. The abutting section cooperates and abuts against the guide sleeve 50. Through the above arrangement, the elastic sheet 62 can provide elastic compensation for the guide sleeve 50, absorb the force of the refrigerant fluid impacting the guide sleeve 50, prevent the guide sleeve 50 from shaking, ensure the guiding function of the guide sleeve 50, and enhance the stability of the electronic expansion valve.

[0093] According to another aspect of the present application, a processing method for an electronic expansion valve is provided. The electronic expansion valve is an electronic expansion valve having a valve core 30 and a valve sleeve 20. The processing method includes: fixing the valve core 30 on the valve sleeve 20, and fixing the valve sleeve 20 on the open end of the sleeve 10 to seal the open end of the sleeve 10.

[0094] According to the technical solution provided in the present application, during the processing of the electronic expansion valve, by first fixing the valve core 30 on the valve sleeve 20 and then fixing the valve sleeve 20 on the open end of the sleeve 10, it is possible to prevent 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.

[0095] Furthermore, the electronic expansion valve also includes a guide sleeve 50 and a stopper 60. The processing method further includes: before securing the valve sleeve 20 to the open end of the sleeve 10, installing the stopper 60 within the sleeve 10 so that one side of the stopper 60 abuts the inner wall of the sleeve 10; and installing the guide sleeve 50 so that one side of the guide sleeve 50 abuts the other side of the stopper 60. The step of securing the valve sleeve 20 to the open end of the sleeve 10 further includes: abutting one end of the valve sleeve 20 located on the sleeve 10 against a side of the guide sleeve 50 away from the stopper 60. With the above arrangement, one side of the guide sleeve 50 abuts the stopper 60, and the other side of the guide sleeve 50 abuts the valve sleeve 20. The guide sleeve 50 can be secured to the valve sleeve 20 within the sleeve 10 via the stopper 60, ensuring stable installation of the guide sleeve 50. Simultaneously, the guide sleeve 50 and the valve sleeve 20 can use the positioning base of the sleeve 10 to further ensure assembly accuracy.

[0096] In this application, the sleeve 10 and / or valve sleeve 20 are integrally formed using a stretching process. The sleeve 10 forms a receiving cavity 11 and a valve cavity 12, while the valve sleeve 20 forms a mounting cavity. The rotor assembly 90 is located within the receiving cavity 11, the valve needle 40 is located within both the receiving cavity 11 and the valve cavity 12, and the valve core 30 is located within the mounting cavity. Compared to conventional solutions in which the valve sleeve and valve seat are formed from brass by turning or extrusion, this arrangement reduces the overall processing cost of the electronic expansion valve. Furthermore, the high precision of the stretching process reduces the tolerances of the sleeve 10 and valve sleeve 20 during the forming process, ensuring accurate flow control of the electronic expansion valve.

[0097] Specifically, the electronic expansion valve further includes a connecting tube 80, and the steps of securing the valve core 30 to the valve sleeve 20 further include: placing the valve core 30 within the valve sleeve 20, with one side of the valve core 30 abutting against the inner wall of the valve sleeve 20; inserting one end of the connecting tube 80 into the valve sleeve 20 and abutting against the other side of the valve core 30; and welding the connecting tube 80 to the valve sleeve 20. With the above arrangement, the valve core 30 is first secured within the valve sleeve 20 through the valve sleeve 20 and the connecting tube 80, and then the connecting sleeve 10 and the valve sleeve 20 are welded. This allows the valve sleeve 20 to be processed and assembled in advance. This reduces the number of parts and assembly steps when the entire electronic expansion valve is to be assembled, thereby improving the assembly efficiency of the electronic expansion valve.

[0098] After the guide sleeve 50, the limit member 60, the sleeve 10, the valve core 30, and the valve sleeve 20 are assembled, the valve needle 40 and the rotor assembly 90 can be installed through the blocked end of the sleeve 10 to facilitate the pulse setting of the rotor assembly 90 and determine the stroke of the valve needle 40 in the electronic expansion valve.

[0099] According to another aspect of the present application, a method for processing an electronic expansion valve is provided. The electronic expansion valve is an electronic expansion valve having a valve seat core 100. The electronic expansion valve also includes a guide sleeve 50 and a limiter 60. The processing method includes: fixing the guide sleeve 50 and the limiter 60 in a sleeve 10, and fixing the valve seat core 100 at the open end of the sleeve 10 to block the open end of the sleeve 10. Through the above arrangement, one side of the guide sleeve 50 abuts against the limiter 60, and the other side of the guide sleeve 50 abuts against the valve seat core 100. The guide sleeve 50 can be fixed to the valve seat core 100 in the sleeve 10 through the limiter 60 to ensure stable installation of the guide sleeve 50. At the same time, the guide sleeve 50 and the valve seat core 100 can use the same positioning base of the guide sleeve 50, further ensuring the accuracy of the assembly work. Furthermore, the step of fixing the guide sleeve 50 and the stopper 60 in the sleeve 10 includes: installing the stopper 60 in the sleeve 10 so that one side of the stopper 60 abuts the inner wall of the sleeve 10, and installing the guide sleeve 50 so that one side of the guide sleeve 50 abuts the other side of the stopper 60. Through the above arrangement, the stopper 60 is installed first and then the guide sleeve 50 is installed. Compared with the solution of first assembling the stopper 60 and the guide sleeve 50 and then installing them into the sleeve 10 at the same time, this arrangement can provide a basis for positioning the stopper 60, facilitate determining the position of the stopper 60 after installation, and improve the convenience of the overall assembly of the electronic expansion valve.

[0100] Specifically, in this application, the electronic expansion valve also includes a rotor assembly 90, which is drivingly connected to the valve needle 40. The sleeve 10 is integrally formed by a stretching process to form a receiving cavity 11 and a valve cavity 12. The rotor assembly 90 is located within the receiving cavity 11, the valve needle 40 is located within the receiving cavity 11 and the valve cavity 12, and the valve seat core 100 is located within the valve cavity 12. Compared to traditional solutions in which the valve sleeve and valve seat are turned or extruded from brass, this arrangement can reduce the overall processing cost of the electronic expansion valve. At the same time, the high precision of the stretching process can reduce the tolerance of the sleeve 10 during the molding process, ensuring the accuracy of the flow adjustment of the electronic expansion valve.

[0101] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0102] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0103] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element 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 this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0104] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0105] 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. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0106] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

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 9, characterized in that: A limiting protrusion (56) is provided on the side wall of the guide sleeve (50), and the limiting protrusion (56) is inserted into the avoidance space and is used to limit the relative rotation of the elastic sheet (62) and the guide sleeve (50) in the circumferential direction.

11. 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.

12. The electronic expansion valve according to claim 5, characterized in that: The electronic expansion valve further comprises a first anti-rotation 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).

13. The electronic expansion valve according to claim 12, characterized in that: The first 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 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).

14. The electronic expansion valve according to claim 13, 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).

15. The electronic expansion valve according to claim 14, characterized in that: The first 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 in a one-to-one correspondence with the anti-rotation protrusions (53).

16. The electronic expansion valve according to claim 2, characterized in that: The electronic expansion valve further comprises a connecting pipe (80), one end of which is inserted into the valve sleeve (20), the connecting pipe (80) is located on a side of the valve core (30) away from the valve needle (40), and the connecting pipe (80) is fixed to the valve sleeve (20) by welding.

17. The electronic expansion valve according to claim 16, characterized in that: The diameter of the fixed section (21) is greater than the diameter of the circulation section (22), and the connecting pipe (80) is arranged inside the circulation section (22).

18. The electronic expansion valve according to claim 17, 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 material for welding the connecting pipe (80) and the valve sleeve (20) is located in the gap.

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

20. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises a rotor assembly (90), wherein the rotor assembly (90) is fixedly connected to the valve needle (40) to drive the valve needle (40) to move relative to the valve port (31).

21. The electronic expansion valve according to claim 20, characterized in that: The rotor assembly (90) includes a rotor connecting plate (92) and a fixing member (93), wherein the fixing member (93) is arranged between the valve needle (40) and the rotor connecting plate (92), the valve needle (40) is connected to the rotor connecting plate (92) through the fixing member (93), a fixing hole (921) is arranged on the rotor connecting plate (92), the fixing member (93) is sleeved on the outside of the valve needle (40) and arranged in the fixing hole (921), and a second anti-rotation structure is arranged between the fixing member (93) and the fixing hole (921) to limit the relative rotation between the valve needle (40) and the rotor connecting plate (92).

22. The electronic expansion valve according to claim 20, characterized in that: The rotor assembly (90) further comprises a magnetic rotor (91), a rotor connecting plate (92) and a stop mechanism (94); the magnetic rotor (91) is sleeved on the outer side of the rotor connecting plate (92); the magnetic rotor (91) has a rotor cavity (911); at least part of the stop mechanism (94) is located in the rotor cavity (911); a guide rod (922) is further provided on the rotor connecting plate (92); the guide rod (922) is engaged with the stop mechanism (94) to limit the axial movement of the magnetic rotor (91).

23. 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 seat core (100), the valve seat core (100) being arranged at the opening end, the valve seat core (100) blocking the opening end, the valve seat core (100) having a valve port (31), and the valve cavity (12) and the valve port (31) being in communication 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).

24. The electronic expansion valve according to claim 23, 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 the end surface of the guide sleeve (50) close to the opening end abuts against the valve seat core (100), and a flow hole (57) is arranged on the side wall of the guide sleeve (50), and the valve cavity (12) and the valve port (31) are connected through the flow hole (57).

25. The electronic expansion valve according to claim 24, characterized in that: A limiting boss (110) is provided on the end surface of the valve seat core (100) on the side close to the guide sleeve (50), and the guide sleeve (50) is sleeved on the outside of the limiting boss (110) to limit the relative displacement of the guide sleeve (50) relative to the valve seat core (100) in the radial direction.

26. The electronic expansion valve according to claim 24, characterized in that: The electronic expansion valve further comprises a limit member (60), wherein the limit member (60) is fixedly arranged between the guide sleeve (50) and the sleeve (10), and one side of the limit member (60) abuts against a side of the guide sleeve (50) facing away from the valve seat core (100) to limit the displacement of the guide sleeve (50) away from the opening end.

27. The electronic expansion valve according to claim 26, 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 that are arranged opposite to each other, and the first end of the pressing ring (61) abuts against the inner wall of the sleeve (10), and the second end of the pressing ring (61) is connected to the connecting end, and the free end abuts against the guide sleeve (50).

28. The electronic expansion valve according to claim 27, characterized in that: The limiting member (60) comprises a plurality of elastic sheets (62), and the plurality of elastic sheets (62) are arranged in the through hole at an annular interval, and there is an escape space between the free ends of the plurality of elastic sheets (62). The guide sleeve (50) is inserted into 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 with and abuts against the guide sleeve (50).

29. A method for processing an electronic expansion valve, characterized in that: The electronic expansion valve is the electronic expansion valve according to any one of claims 1 to 22, and the processing method comprises: Fixing the valve core (30) on the valve sleeve (20); The valve sleeve (20) is fixed to the open end of the sleeve (10) to seal the open end of the sleeve (10).

30. The processing method according to claim 29, characterized in that: The electronic expansion valve further comprises a guide sleeve (50) and a stopper (60), and the processing method further comprises: Before the valve sleeve (20) is fixed to the open end of the sleeve (10), the stopper (60) is installed in the sleeve (10) so that one side of the stopper (60) abuts against the inner wall of the sleeve (10); Installing the guide sleeve (50) so that one side of the guide sleeve (50) abuts against the other side of the limiting member (60); The step of fixing the valve sleeve (20) to the open end of the sleeve (10) 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).

31. The processing method according to claim 29, characterized in that: The electronic expansion valve is the electronic expansion valve according to claim 20, the sleeve (10) and / or the valve sleeve (20) are integrally formed by a stretching process, the sleeve (10) forms a accommodating cavity (11) and a valve cavity (12), the valve sleeve (20) forms an installation cavity, the rotor assembly (90) is located in the accommodating cavity (11), the valve needle (40) is located in the accommodating cavity (11) and the valve cavity (12), and the valve core (30) is located in the installation cavity.

32. The processing method according to claim 29, characterized in that: The electronic expansion valve further comprises a connecting pipe (80), and the step of fixing the valve core (30) on the valve sleeve (20) further 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.

33. A method for processing an electronic expansion valve, characterized in that: The electronic expansion valve is the electronic expansion valve according to any one of claims 23 to 28, the electronic expansion valve further comprises a guide sleeve (50) and a limiter (60), and the processing method comprises: The guide sleeve (50) and the limiting member (60) are fixed in the sleeve (10), with one side of the limiting member (60) abutting against the inner wall of the sleeve (10); and one side of the guide sleeve (50) abutting against the other side of the limiting member (60); The valve seat core (100) is fixed to the open end of the sleeve (10) to seal the open end of the sleeve (10).

34. The processing method according to claim 33, characterized in that: The electronic expansion valve further comprises a rotor assembly (90), wherein the rotor assembly (90) is drivingly connected to the valve needle (40), the sleeve (10) is integrally formed by a stretching process to form a receiving cavity (11) and a valve cavity (12), the rotor assembly (90) is located in the receiving cavity (11), the valve needle (40) is located in the receiving cavity (11) and the valve cavity (12), and the valve seat core (100) is located in the valve cavity (12).

Images