Electronic Expansion Valve

Abstract

The present application includes a valve body having a receiving chamber and a valve port, the valve port communicating with the receiving chamber; a guide sleeve provided in the receiving chamber; and a valve head movably provided in the guide sleeve, the valve head being used for closing or opening the valve port, the valve head having a balancing passage provided therein, and both ends communicating with each other through the balancing passage, wherein the valve head has a first end and a second end provided opposite to each other, the first end being used for closing the valve port, the refrigerant medium and the first end having a first force receiving area S1, and the refrigerant medium and the second end having a second force receiving area S2, and the force receiving area is -1.3mm 2 ≦S1-S2≦1.3mm 2 The technical aspects provided in the present application can solve the problem of low operational reliability of electronic expansion valves in the prior art.

Description

[Technical Field]

[0001] This application claims priority from a patent application filed with the State Intellectual Property Office of the People's Republic of China on September 30, 2021, bearing application number 202122404672.7 and entitled "Electronic Expansion Valve"; This application claims priority from a patent application filed with the State Intellectual Property Office of the People's Republic of China on September 30, 2021, bearing application number 202122433317.2 and entitled "Electronic Expansion Valve"; This application claims priority from a patent application filed with the State Intellectual Property Office of the People's Republic of China on September 30, 2021, bearing application number 202122410246.4 and entitled "Electronic Expansion Valve"; This application claims priority from a patent application filed with the State Intellectual Property Office of the People's Republic of China on September 30, 2021, bearing application number 202122407783.3 and entitled "Electronic Expansion Valve"; This application claims priority from a patent application filed with the State Intellectual Property Office of the People's Republic of China on September 30, 2021, bearing application number 202122404603.6 and entitled "Electronic Expansion Valve"; This application claims priority from a patent application filed with the State Intellectual Property Office of the People's Republic of China on September 30, 2021, bearing application number 202122410892.0 and entitled "Electronic Expansion Valve"; This application claims priority from a patent application filed with the State Intellectual Property Office of the People's Republic of China on September 30, 2021, bearing application number 202122406183.5 and entitled "Electronic Expansion Valve"; This application claims priority to a patent application filed with the State Intellectual Property Office of China on September 30, 2021, bearing application number 202122411574.6 and entitled "Electronic Expansion Valve."

[0002] TECHNICAL FIELD This application relates to the field of valves, and more particularly to electronic expansion valves. [Background technology]

[0003]

[0003] As a new type of control element, an electronic expansion valve has become an important component of intelligent refrigeration systems. An electronic expansion valve typically includes a valve body and a valve head, the valve body having a chamber and a valve port, and the valve head is movably mounted within the valve chamber to open and close the valve port. However, the pressure difference between both ends of the valve head in conventional electronic expansion valves is too large, resulting in poor reliability of the electronic expansion valve. Summary of the Invention

[0004] The present application provides an electronic expansion valve to solve the problem of unreliable operation of electronic expansion valves in the prior art.

[0005] The present application relates to a valve body having a accommodating chamber and a valve port, the valve port and the accommodating chamber communicating with each other; a guide sleeve provided in the accommodating chamber; and a valve head movably provided in the guide sleeve, the valve head being used to close or open the valve port, the valve head having an equalizing passage provided therein, and both ends of the valve head communicating with each other by the equalizing passage, wherein the valve head has a first end and a second end provided opposite to each other, the first end being used to close the valve port, the refrigerant medium and the first end having a first force-receiving area S1, and the refrigerant medium and the second end having a second force-receiving area S2, and 2 ≦S1-S2≦1.3mm 2 The present invention provides an electronic expansion valve.

[0006]

[0023] By applying the technical aspects of the present application, by limiting the first force-receiving area and the second force-receiving area to the above-mentioned range, when the refrigerant medium flows from the valve port through the equalizing passage into the accommodating chamber, the pressure of the refrigerant medium in the accommodating chamber toward the first end and the second end of the valve head is the same. By setting S1 and S2 within the above-mentioned range, S1 and S2 are close to each other, and after the electronic expansion valve is closed, the pressures experienced by the first end and the second end of the valve head are close to each other, so that only the frictional force needs to be overcome during the opening and closing of the valve head, thereby ensuring the operational performance of the valve head assembly and improving the operational reliability of the electronic expansion valve.

[0007] The valve head further has a first communication hole, a second communication hole, and a third communication hole that are sequentially connected along a direction from the first end to the second end, and the diameters of the first communication hole and the third communication hole are all larger than the diameter of the second communication hole. The electronic expansion valve further comprises a screw movably disposed within the accommodating chamber, one end of which passes through the third communication hole and the second communication hole in turn and enters the first communication hole, and a valve sleeve located within the first communication hole and fixedly connected to an end of the screw, the valve sleeve being restricted in the axial direction by a stepped surface formed by the first communication hole and the second communication hole. and a valve sleeve having a first gap between the screw and the valve sleeve, a second gap between the screw and the valve sleeve, the first gap and the second gap being interconnected to form a balancing passage, and the first communicating hole and the third communicating hole being interconnected by the balancing passage, wherein the area of ​​the end face of the first end is S11, the area of ​​the stepped surface formed by the first communicating hole and the second communicating hole is S12, S1 is the sum of S11 and S12, the area of ​​the end face of the second end is S21, the area of ​​the stepped surface formed by the third communicating hole and the second communicating hole is S22, S2 is the sum of S21 and S22. According to the above design, the first force-bearing area includes S11 and S12, and the second force-bearing area includes S21 and S22. In this way, when designing an electronic expansion valve, it is possible to make S11 and S21 as close as possible, S12 and S22 as close as possible, and finally S1 and S2 as close as possible.

[0008] Furthermore, the outer diameter of the portion of the valve head corresponding to the first communicating hole is D1, the outer diameter of the portion of the valve head corresponding to the third communicating hole is D2, D1 = D2, the diameter of the first communicating hole is d1, the diameter of the third communicating hole is d2, -1 mm ≦ d1 - d2 ≦ 1 mm. By setting d1 and d2 within the above ranges, S12 and S22 are positioned as close as possible, and further, S1 and S2 are positioned as close as possible.

[0009] Furthermore, the outer peripheral surface of the first end is chamfered with R1, where R0.04mm≦R1≦R0.8mm. Setting R1 within this range not only ensures ease of chamfering and ensures the life of the valve head, but also prevents the difference between S11 and S12 from becoming too large.

[0010] Furthermore, the outer diameter of the first end is larger than the outer diameter of the second end, the difference between the outer diameters of the first end and the second end is 4 mm or less, and the difference between the diameters of the first communicating hole and the third communicating hole is -1 mm to 1 mm. In this aspect, by setting the difference between the outer diameters of the first end and the second end and the difference between the diameters of the first communicating hole and the third communicating hole to be within the above ranges in combination, the difference between S1 and S2 can be reduced as much as possible.

[0011] Furthermore, the outer peripheral surface of the first end is chamfered with R2, where R0.04mm≦R2≦3mm. Setting R2 within this range not only ensures ease of chamfering and ensures the life of the valve head, but also prevents the difference between S11 and S12 from becoming too large.

[0012] Furthermore, the portion of the valve head corresponding to the first communicating hole has a first segment, a transition segment, and a second segment connected in sequence from the first end to the second end, with the outer diameter of the second segment being smaller than that of the first segment, and the outer diameter of the transition segment gradually decreasing from the first segment to the second segment. This configuration prevents a stepped structure from appearing on the outer surface of the valve head, ensures the smoothness of the outer surface of the valve head, and facilitates processing and molding of the valve head.

[0013] Further, the first communication hole includes a first through hole and a second through hole provided in a stepped shape, the diameter of the first through hole being larger than the diameter of the second through hole, the first through hole being provided close to the valve orifice, there is a stepped surface between the first through hole and the second through hole, the area of ​​the stepped surface is S10, S1 being the sum of S10, S11, and S12, and / or the third communication hole includes a third through hole and a fourth through hole which are sequentially connected to each other, the fourth through hole being a tapered hole, the diameter of the fourth through hole gradually increasing in the direction away from the valve orifice, the force receiving area of ​​the fourth through hole being S20, S2 being the sum of S20, S21, and S22. The above-described arrangement makes it easier for an operator to distinguish between the two ends of the valve head, and further makes it easier for an operator to assemble the valve head. Furthermore, by providing it as described above, the influence on the difference between the first force receiving area S1 and the second force receiving area S2 becomes relatively small.

[0014] Furthermore, the outer peripheral surface of the end of the second end is chamfered with R3, which prevents burrs from forming on the end of the second end and ensures smooth movement of the valve head. [Brief explanation of the drawings]

[0015] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and descriptions thereof are intended to aid in the interpretation of the application and are not intended to unduly limit the application.

[0016] [Figure 1] 1 shows a structural schematic diagram of the electronic expansion valve provided in this application. [Figure 2] 1 shows a structural schematic diagram of the valve head provided in the present application. [Figure 3] 1 shows a structural schematic diagram of the electronic expansion valve provided in this application. [Figure 4] 1 shows a structural schematic diagram of the valve head provided in the present application. [Figure 5] 1 shows a cross-sectional view of an assembled screw, valve sleeve and valve head provided in an example of the present application. [Figure 6] 1 shows a dimensional schematic diagram of the screw, valve sleeve and valve head after assembly provided in the present application. [Figure 7] 7 shows a cross-sectional view taken along the line AA in FIG. 6. [Figure 8] 1 shows a structural schematic diagram of a valve sleeve provided in the present application. [Figure 9] 1 shows a structural schematic diagram of a guide sleeve provided in the present application. [Figure 10] 1 shows a structural schematic diagram of a sealing ring provided in the present application; [Figure 11] 1 shows a cross-sectional view of an electronic expansion valve provided in the present application. [Figure 12] 1 shows a cross-sectional view of a valve seat provided in the present application. [Figure 13] A dimensional schematic diagram of a portion A in FIG. 11 is shown. [Figure 14] 1 shows a cross-sectional view of an assembled valve seat and guide sleeve provided in an embodiment of the present application. [Figure 15] 1 shows a cross-sectional view of a guide sleeve provided in the present application. [Figure 16] 1 shows a cross-sectional view of a valve seat provided in the present application. [Figure 17] 1 shows a dimensional schematic diagram of the valve seat and guide sleeve provided in the present application. [Figure 18] 1 shows a cross-sectional view of an electronic expansion valve provided in the present application. [Figure 19] 1 shows a structural schematic diagram of the electronic expansion valve provided in this application. [Figure 20] 19. FIG. 20 shows an enlarged view of part B in FIG. [Figure 21] 1 shows a structural schematic diagram of a guide sleeve provided in the present application. [Figure 22] 1 shows a structural schematic diagram of the electronic expansion valve provided in this application. [Figure 23] FIG. 23 shows a structural schematic diagram of the assembly of the valve seat and the guide sleeve in FIG. [Figure 24] FIG. 23 shows a structural schematic diagram of the nut sleeve in FIG. [Figure 25]A structural schematic diagram of the guide sleeve in FIG. 22 is shown. [Figure 26] 1 shows a structural schematic diagram of the electronic expansion valve provided in this application. [Figure 27] A structural schematic diagram of the nut sleeve in FIG. 26 is shown. [Figure 28] A structural schematic diagram of the guide sleeve in FIG. 26 is shown.

[0017] Here, the above drawings include the following reference numerals: 10 valve body, Containment room 101, 102 valve orifice, 1021 first tapered hole segment, 1022 straight hole segment, 1023 second tapered hole segment, 103 first opening, 1031 connecting pipe, 104 second opening, 11 valve seat, 1101 valve chamber, 11011 first mounting segment, 11012 second mounting segment, 12 housing, 121 mounting chamber, 111 first hole segment, 112 second hole segment, 20 guide sleeve, 201 guide hole, 21 connection segment, 211 first connection segment, 212 second connection segment, 22 guide segments, 23 Welding ring groove, 24 first cylindrical segment, 25 buffer segment, 26 second cylindrical segment, 30 valve head, 301 first end, 302 second end, 31 1st communication hole, 311 first segment, 312 transition segment, 313 second segment, 3101 first through hole, 3102 second through hole, 32 2nd communication hole, 33 3rd communication hole, 331 third through hole, 332 fourth through hole, 40 screw, 41 first rod segment, 42 second rod segment, 43 third rod segment, 44 cross-sectional structure, 50 valve sleeve, 51 first connecting hole, 52 annular groove, 60 springs, 70 sealing ring, 80 nut sleeve, 81 annular mounting plate, 801 second guide hole, 802 second connecting hole. DETAILED DESCRIPTION OF THE INVENTION

[0018] The technical aspects of the embodiments of the present application will be described below clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are only some of the embodiments of the present application and do not represent all of the embodiments. Based on the embodiments of the present application, all other embodiments that can be obtained by a person skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0019] As shown in FIG. 1 , an embodiment of the present application provides an electronic expansion valve including a valve element 10, a guide sleeve 20, and a valve head 30. The valve element 10 has a chamber 101 and a valve port 102, and the valve port 102 communicates with the chamber 101. The guide sleeve 20 is disposed within the chamber 101. The valve head 30 is movably disposed within the guide sleeve 20 and is used to close or open the valve port 102. A balancing passage is disposed within the valve head 30, and both ends of the valve head 30 communicate with each other through the balancing passage. The valve element 30 has a first end 301 and a second end 302 disposed opposite each other. The first end 301 is used to close the valve port 102. The refrigerant medium and the first end 301 have a first force-receiving area S1, and the refrigerant medium and the second end 302 have a second force-receiving area S2. The force-receiving area is −1.3 mm. 2 ≦S1-S2≦1.3mm 2 is.

[0020] By applying the technical aspects of the present application, the first force-receiving area and the second force-receiving area are limited to the above-mentioned ranges, so that the refrigerant medium flows from the valve port 102 through the equalizing passage into the accommodating chamber 101, and the pressure of the refrigerant medium in the accommodating chamber 101 at the first end 301 and the second end 302 of the valve head 30 is the same. By arranging S1 and S2 within the above-mentioned ranges, S1 and S2 are close to each other, and after the electronic expansion valve is closed, the pressures experienced by the first end 301 and the second end 302 of the valve head 30 are close to each other, so that only the frictional force needs to be overcome during the opening and closing of the valve head 30, thereby ensuring the operational performance of the valve head 30 assembly and improving the operational reliability of the electronic expansion valve.

[0021] 1 and 2, the valve head 30 has a first communication hole 31, a second communication hole 32, and a third communication hole 33 that are sequentially connected along a direction from a first end 301 to a second end 302. The diameters of the first communication hole 31 and the third communication hole 33 are all larger than the diameter of the second communication hole 32. The electronic expansion valve further includes a screw 40 and a valve sleeve 50. The screw 40 is movably disposed within the accommodating chamber 101. One end of the screw 40 passes through the third communication hole 33 and the second communication hole 32, and enters the first communication hole 31. The valve sleeve 50 is located within the first communication hole 31 and fixedly connected to an end of the screw 40. The first communication hole 31 and the second communication hole 32 define a space between the screw 40 and the valve sleeve 50. The valve sleeve 50 is restricted in the axial direction by a stepped surface formed by the screw 40, a first gap is formed between the screw 40 and the second communicating hole 32, and a second gap is formed between the screw 40 and the valve sleeve 50. The first gap and the second gap are connected to each other to form a balancing passage. The first communicating hole 31 and the third communicating hole 33 are connected to each other by a balancing passage. Here, the area of ​​the end face of the first end 301 shown is S11, the area of ​​the stepped surface formed by the first communicating hole 31 and the second communicating hole 32 is S12, S1 is the sum of S11 and S12, the area of ​​the end face of the second end 302 is S21, the area of ​​the stepped surface formed by the third communicating hole 33 and the second communicating hole 32 is S22, and S2 is the sum of S21 and S22. According to the above design, the first force-bearing area includes S11 and S12, and the second force-bearing area includes S21 and S22. In this way, when designing an electronic expansion valve, it is possible to make S11 and S21 as close as possible, S12 and S22 as close as possible, and finally S1 and S2 as close as possible.

[0022] Specifically, a notch is provided on the circumferential surface of the screw 40, extending toward the valve port 102 and defining a first gap between the screw 40 and the second communication hole 32. The valve sleeve 50 is provided with a flow hole extending along the axial direction of the valve sleeve 50, and the end of the screw 40 where the notch is provided is inserted into the flow hole and fixedly engaged with the valve sleeve 50, with the notch defining a second gap between the screw 40 and the flow hole. By providing the notch as described above, it is possible to ensure that the first gap and the second gap are both located on the same side of the screw 40 so that a clearance fit between them forms an equalizing passage, and it is also easy to fix the screw 40 and the valve sleeve 50 together.

[0023] Furthermore, the outer diameter of the portion of the valve head 30 corresponding to the first communication hole 31 is D1, and the outer diameter of the portion of the valve head 30 corresponding to the third communication hole 33 is D2, where D1 = D2, the diameter of the first communication hole 31 is d1, and the diameter of the third communication hole 33 is d2, where -1 mm ≦ d1 - d2 ≦ 1 mm. By setting d1 and d2 within the above ranges, S12 and S22 are brought as close as possible, and further, S1 and S2 are ensured as close as possible. Specifically, d1 and d2 may have the relationship d1 - d2 = -1 mm, d1 = d2, or d1 - d2 = 1 mm.

[0024] Furthermore, the outer peripheral surface of the end of the first end 301 is chamfered R1, with R0.04mm≦R1≦R0.8mm. When the electronic expansion valve is in a closed state, the outer peripheral surface of the end of the first end 301 where the chamfer R1 is provided engages with the valve port 102, thereby closing the valve port 102. If R1 is less than 0.04mm, the chamfering process is inconvenient, and the chamfer is prone to wear after long-term use, shortening the service life of the valve head 30. If R1 is greater than 0.8mm, when the electronic expansion valve is closed, the gap between the valve port 102 and the outer peripheral surface of the valve head 30 will be too large, resulting in a large difference between S11 and S21. Therefore, in this embodiment, setting R1 within the above range not only ensures the convenience of chamfering and the service life of the valve head 30, but also prevents the difference between S11 and S21 from becoming too large. Specifically, R1 may be set to 0.04 mm, 0.1 mm, 0.2 mm, 0.4 mm, or 0.8 mm.

[0025] Furthermore, the first communication hole 31 includes a first through hole 3101 and a second through hole 3102 which are connected in a stepped manner, the diameter of the first through hole 3101 being larger than the diameter of the second through hole 3102, the first through hole 3101 being located close to the valve orifice 102, there is a stepped surface between the first through hole 3101 and the second through hole 3102, the area of ​​the stepped surface is S10, S1 being the sum of S10, S11 and S12, and / or the third communication hole 33 includes a third through hole 331 and a fourth through hole 332 which are connected in sequence, the fourth through hole 332 being a tapered hole, the diameter of the fourth through hole 332 gradually increasing in the direction away from the valve orifice 102, the force receiving area of ​​the fourth through hole 332 being S20, and S2 being the sum of S20, S21 and S22. Specifically, the diameter of the second through hole 3102 is d1, and the diameter of the third through hole 331 is d2. In this embodiment, the shapes of both ends of the valve head 30 are similar to each other, and providing them as described above makes it easier for the worker to distinguish between the two ends of the valve head 30, and further makes it easier for the worker to assemble the valve head 30. Furthermore, providing them as described above makes the effect on the difference between the first force receiving area S1 and the second force receiving area S2 relatively small.

[0026] Furthermore, a chamfer R3 is provided on the outer peripheral surface of the end of the second end 302. Preferably, R0.2 mm≦R3≦R1.3 mm. Specifically, R=0.2 mm, 0.5 mm, 1 mm, or 1.3 mm. Providing R3 prevents burrs from forming on the end of the second end 302 and ensures smooth movement of the valve head 30.

[0027] In this embodiment, D1=D2, d1=d2, and R1=R0.04 mm. By configuring as above, the difference between the first force-bearing area and the second force-bearing area is within 1.3 mm, which further reduces the pressure difference between the two ends of the valve head 30 and ensures the reliable operation of the electronic expansion valve.

[0028] 3 and 4, the electronic expansion valve of the present application is further configured so that the outer diameter of the first end 301 is larger than the outer diameter of the second end 302, the difference between the outer diameters of the first end 301 and the second end 302 is 4 mm or less, and the difference between the diameters of the first communicating hole 31 and the third communicating hole 33 is −1 mm to 1 mm. In this embodiment, by setting the difference between the outer diameters of the first end 301 and the second end 302 and the difference between the diameters of the first communicating hole 31 and the third communicating hole 33 within the above ranges in combination, the difference between S1 and S2 can be reduced as much as possible. Specifically, the outer diameter of the first end 301 is D11, the diameter of the first communicating hole 31 is d11, the outer diameter of the second end 302 is D12, and the diameter of the third communicating hole 33 is d12, and D11, D12, d11, and d12 may have the relationship D11-D12=0.5mm, d11-d12=-1mm, or D11-D12=1.5mm, d11=d12, or D11-D12=4mm, or d11-d12=1mm.

[0029] Furthermore, the outer peripheral surface of the end of the first end 301 is chamfered with R2, which satisfies the following criteria: 0.04 mm≦R2≦3 mm. If R2 is less than 0.04 mm, the chamfering process is inconvenient, and the chamfer is prone to wear after prolonged use, shortening the service life of the valve head 30. If R2 is greater than 3 mm, the gap between the valve head 30's contact point with the valve port 102 and the outer peripheral surface of the valve head 30 when the electronic expansion valve is closed will be too large, resulting in a large difference between S11 and S21. Therefore, in this embodiment, setting R2 within the above range not only ensures convenient chamfering and ensures the service life of the valve head 30, but also prevents the difference between S11 and S12 from becoming too large. Specifically, R2 may be 0.04 mm, 1 mm, 2 mm, or 3 mm.

[0030] Specifically, the portion of the valve head 30 corresponding to the first communicating hole 31 comprises a first segment 311, a transition segment 312, and a second segment 313, which are connected in sequence from the first end 301 to the second end 302. The outer diameter of the second segment 313 is smaller than that of the first segment 311, and the outer diameter of the transition segment 312 gradually decreases from the first segment 311 to the second segment 313. This configuration prevents steps from appearing on the outer surface of the valve head 30, ensures the smoothness of the outer surface of the valve head 30, and facilitates the processing and molding of the valve head 30.

[0031] In this embodiment, D11-D12=1.5 mm, d11=d12, and R2=R1 mm. By configuring as above, the difference between the first and second force receiving areas is within 1.3 mm, which further reduces the difference in pressure received by both ends of the valve head 30 and ensures the reliability of the operation of the electronic expansion valve.

[0032] 1 and 5, the electronic expansion valve of the embodiment of the present application includes a valve element 10, a valve head 30, a screw 40, and a valve sleeve 50. Here, the valve element 10 has a valve port 102, the valve head 30 is movably installed within the valve element 10 and can close or open the valve port 102, and has a first communication hole 31, a second communication hole 32, and a third communication hole 33 that are sequentially connected along the axial direction, the first communication hole 31 is located adjacent to the valve port 102, and the diameter of the second communication hole 32 is smaller than the diameters of the first communication hole 31 and the third communication hole 33, the screw 40 is inserted into the valve head 30, and has a first rod segment 41 and a second rod segment 42 that are sequentially arranged along the axial direction, and the screw 40 The side wall of the screw 40 has a cross-sectional structure 44 extending from the middle of the first rod segment 41 to the end of the second rod segment 42, and there is a balancing passage between the cross-sectional structure 44 and the valve head 30. The valve sleeve 50 is located in the first communicating hole 31 and has a first connecting hole 51. The second rod segment 42 is connected to the first connecting hole 51. There is a first gap between the cross-sectional structure 44 and the first connecting hole 51, where the diameter of the first connecting hole 51 is D3, the maximum value of the first gap is L1, and 0.5*D3>L1>0.1*D3.

[0033] If L1 > 0.5D3, the maximum value of the first gap is too large, thereby reducing the weld strength between the valve sleeve 50 and the screw 40, potentially causing the connection between the valve sleeve 50 and the screw 40 to fail and affecting the structural strength of the welded valve sleeve 50 and the screw 40. If L1 < 0.1D3, the maximum value of the first gap is too small, which also reduces the flow rate of the medium passing through the first gap, thereby reducing the balancing speed of the balancing passage. Therefore, in this application, the maximum value of the first gap L1 is set to 0.5*D3 > L1 > 0.1*D3 to ensure the balancing speed of the balancing passage and improve the operating efficiency of the device. Specifically, L1 may be 0.2D3, 0.3D3, or 0.4D3.

[0034] The above structure allows the valve head 30 to be movably mounted within the valve disc 10, and the screw 40 to be inserted into the valve head 30, allowing the valve head 30 to easily close or open the valve port 102 in the valve disc 10. At the same time, the screw 40 is inserted and connected to the first connecting hole 51 in the valve sleeve 50. A cross-sectional structure 44 is formed on the side wall of the screw 40, and a balancing passage is formed between the screw 40 and the valve head 30 using the cross-sectional structure 44. This simplifies the machining of the balancing passage and simplifies its dimensions. A first gap is formed between the cross-sectional structure 44 and the first connecting hole 51. The diameter of the first connecting hole 51 is D3, and the maximum value of the first gap is L1, with the relationship 0.5*D3>L1>0.1*D3. This not only simplifies the machining of the balancing passage and simplifies its dimensions, but also ensures the balancing speed of the balancing passage and improves the operating efficiency of the device.

[0035] As shown in FIGS. 6 and 7, the cross-sectional area of ​​the first gap is S, and S≧0.8 mm 2 By providing it as described above, an effective balancing area can be provided, and the balancing speed of the balancing passage can be further ensured. Specifically, S is 0.8 mm 2 , 0.9mm 2 or 1.0 mm 2 may be.

[0036] Specifically, the cross-sectional structure 44 has an axial length L2, a second gap is formed between the cross-sectional structure 44 and the second communicating hole 32, and the sum of the axial lengths of the first gap and the second gap is L3, where L2≧1.3*L3. This configuration increases the axial length of the balancing passage, allowing the medium to pass through the first gap and reach the upper end of the valve head 30 more quickly, further improving the balancing speed of the balancing passage. Here, the value of L2 may be 1.3*L3, 1.4*L3, or 1.5*L3.

[0037] Furthermore, the second gap is larger than the first gap, which provides a larger flow space for the medium, which is advantageous for the medium to pass through the first gap and then through the second gap more quickly, improving the flow efficiency of the device.

[0038] Specifically, the distance L4 between the end of the cross-sectional structure 44 away from the valve sleeve 50 and the upper surface of the valve head 30 is 3 mm or less. This configuration further ensures that the medium continues to flow through the gap between the first segment and the first communication hole after passing through the balancing passage, shortening the time it takes for the medium to reach the upper end of the valve head 30 and further improving the balancing speed of the device. Here, the value of L4 may be 3 mm, 2 mm, or 1 mm.

[0039] The screw 40 further includes a third rod segment 43, which is connected to one end of the first rod segment 41 remote from the valve orifice 102. The third rod segment 43 has a diameter greater than that of the first rod segment 41. The distance between the end of the cross-sectional structure 44 remote from the valve sleeve 50 and the end of the third rod segment 43 close to the valve orifice 102 is L5, where L5≧2*D3. This arrangement is advantageous for guiding the screw 40 during operation of the device. At the same time, the diameter of the third rod segment 43 being greater than that of the first rod segment 41 ensures stability during operation of the device. Here, the value of L5 may be 2*D3, 3*D3, or 4*D3.

[0040] Specifically, the diameter of the first rod segment 41 is larger than the diameter of the second rod segment 42. This arrangement is advantageous for increasing the structural strength of the lower segment of the screw 40, ensuring the working performance of the device during operation.

[0041] Furthermore, the electronic expansion valve further includes a spring 60 fitted to the screw 40, one end of which abuts against the stepped surface between the third communicating hole 33 and the second communicating hole 32, and the other end of which abuts against the stepped surface between the first rod segment 41 and the third rod segment 43. This structure allows the valve head 30 to close the valve port 102 without being affected by any external force.

[0042] According to the technical aspects provided by the present application, the valve head 30 is movably mounted within the valve disc 10, and the screw 40 is inserted into the valve head 30 to facilitate the valve head 30 closing or opening the valve port 102 in the valve disc 10. At the same time, the screw 40 is inserted and connected to the first connecting hole 51 in the valve sleeve 50. A cross-sectional structure 44 is formed on the side wall of the screw 40, and a balancing passage is formed between the screw 40 and the valve head 30 using the cross-sectional structure 44, thereby reducing the difficulty of machining the balancing passage and simplifying its dimensions. A first gap is formed between the cross-sectional structure 44 and the first connecting hole 51. The diameter of the first connecting hole 51 is D3, and the maximum value of the first gap is L1, with the relationship 0.5*D3>L1>0.1*D3. This not only reduces the difficulty of machining the balancing passage and simplifies its dimensions, but also ensures the balancing speed of the balancing passage and improves the working efficiency of the device. At the same time, a spring 60 is fitted to the screw 40, and this structure allows the valve head 30 to close the valve port 102 without being affected by any external force.

[0043] As shown in Figures 1, 8 to 10, the electronic expansion valve provided in the embodiment of the present application includes a valve element 10, a guide sleeve 20, a valve head 30, and a sealing ring 70. The valve element 10 has a receiving chamber 101, and is provided with a valve port 102 that communicates with the receiving chamber 101 and is used for fluid flow. The guide sleeve 20 is provided in the receiving chamber 101 and fixedly connected to the valve element 10, and is provided with a first guide hole 201. The valve head 30 is movably inserted into the first guide hole 201 and is used for closing the valve port 102. The first guide hole 201 is used to guide the valve head 30 so that the valve head 30 accurately closes the valve port 102. An annular groove 52 is provided on the outer wall of the valve head 30, and the annular groove 52 and the valve head 30 are arranged coaxially. A sealing ring 70 is provided between the first guide hole 201 and the annular groove 52. The sealing ring 70 is used to seal the gap between the first guide hole 201 and the valve head 30, which not only prevents fluid from entering above the guide sleeve 20 and damaging or corroding the components of the electronic expansion valve, but also prevents the valve head 30 from moving.

[0044] Here, the outer diameter of the sealing ring 70 is D32, the diameter of the first guide hole 201 is D31, D32 is larger than D31, and the difference between D32 and D31 is in the range of 0.1 mm to 0.5 mm. If the outer diameter D32 of the sealing ring 70 is smaller than the diameter D31 of the first guide hole 201, the sealing ring 70 will not be able to completely seal the gap between the first guide hole 201 and the valve head 30. Therefore, by making the outer diameter D32 of the sealing ring 70 larger than the diameter D31 of the first guide hole 201, it is possible to completely seal the gap between the first guide hole 201 and the valve head 30. If the difference between D32 and D31 is less than 0.1 mm, the sealing effect between the guide sleeve and the valve sleeve will not be good. If the difference between D32 and D31 is more than 0.5 mm, the pressing force between the sealing ring and the guide sleeve will be relatively large, the friction force between the sealing ring and the guide sleeve will be relatively large, and the sealing ring will be more susceptible to wear. Therefore, by setting the difference between D32 and D31 in the range of 0.1 mm to 0.5 mm, not only can the sealing effect between the guide sleeve and the valve sleeve be relatively good, but the sealing ring will also be less susceptible to wear and the service life of the sealing ring can be extended.

[0045] When the technical aspects of the present application are applied, an annular groove 52 is formed on the outer wall of the valve head 30, and a sealing ring 70 is disposed between the first guide hole 201 and the annular groove 52, thereby firmly holding the sealing ring 70 between the first guide hole 201 and the valve head 30. By setting the difference between D32 and D31 to be in the range of 0.1 mm to 0.5 mm, the sealing effect between the guide sleeve 20 and the valve head 30 can be relatively good, the sealing ring 70 can be made less susceptible to wear, and the service life of the sealing ring 70 can be extended. Furthermore, frictional forces are generated between the sealing ring 70 and the guide sleeve 20 and between the sealing ring 70 and the valve head 30, which prevents the valve head 30 from moving relative to the guide sleeve 20.

[0046] 8 to 10 , specifically, the inner diameter of the annular groove 52 is D34, the inner diameter of the sealing ring 70 is D35, and the difference between D34 and D35 is in the range of −0.5 mm to 0.5 mm. If the difference between D34 and D35 is less than −0.5 mm, the gap between the annular groove 52 and the sealing ring 70 becomes relatively large, the sealing ring 70 is easily pressed and deformed by the inner wall of the first guide hole 201, the sealing ring 70 is not tightly attached to the guide sleeve 20 or the annular groove 52, and the sealing ability of the sealing ring 70 is relatively poor. If the difference between D34 and D35 is greater than 0.5 mm, the sealing ring 70 and the annular groove 52 are pressed against each other, causing the sealing ring 70 to be constantly tensioned, which makes the sealing ring 70 more susceptible to fatigue and shortens its lifespan. Therefore, by setting the difference between D34 and D35 in the range of -0.5 mm to 0.5 mm, not only can the sealing performance of the sealing ring 70 be made relatively good, but also the life of the sealing ring 70 can be ensured to be relatively long.

[0047] In this embodiment, the width of the annular groove 52 is L31, and the cross-sectional diameter of the sealing ring 70 is D33, with L31 being 1.1 to 1.4 times D33. If L31 is less than 1.1 times D33, there will not be enough space within the annular groove 52 to accommodate the sealing ring 70 when the sealing ring 70 and the guide sleeve 20 are pressed against each other, and the sealing ring 70 will be more likely to come off the annular groove 52 as the valve head 30 moves along the guide sleeve 20. If L31 is more than 1.4 times D33, the space within the annular groove 52 will be too large, and the sealing ring 70 will be displaced relative to the annular groove 52 as the valve head 30 moves along the guide sleeve 20. This will result in friction between the sealing ring 70 and the annular groove 52 and the guide sleeve 20, and will make the sealing ring 70 more likely to wear. Therefore, by setting L31 to 1.1 to 1.4 times D33, not only can the sealing ring 70 be stably installed in the annular groove 52, but also the sealing ring 70 can be prevented from being excessively worn.

[0048] Specifically, the outer diameter D32 of the sealing ring 70 is in the range of 6.5 mm to 8.5 mm. Because the difference between D32 and D31 is in the range of 0.1 mm to 0.5 mm, the diameter D31 of the first guide hole 201 is in the range of 6 mm to 8.4 mm. If D31 is smaller than 6 mm, the processing of the first guide hole 201 becomes relatively complicated. If D31 is larger than 8.4 mm, the structural dimensions of the guide sleeve 20 become relatively large, reducing the space of the accommodation chamber 101 and further reducing the fluid flow rate. Therefore, by setting D31 in the range of 6 mm to 8.4 mm, not only can the processing of the first guide hole 201 be made easier, but the structural dimensions of the guide sleeve 20 can also be made relatively small. Specifically, D32 may be 6.5 mm, 7.5 mm, or 8.5 mm, and D31 may be 6 mm, 7 mm, or 8.4 mm.

[0049] Specifically, the cross-sectional diameter D33 of the sealing ring 70 is in the range of 0.5 mm to 1 mm. If the cross-sectional diameter D of the sealing ring 70 is smaller than 0.5 mm, the dimensions of the sealing ring 70 become relatively small, making processing difficult and reducing wear resistance. If the cross-sectional diameter D of the sealing ring 70 is larger than 1 mm, a relatively large amount of raw material is required to process the sealing ring 70, resulting in high costs. Therefore, setting the cross-sectional diameter D33 of the sealing ring 70 in the range of 0.5 mm to 1 mm not only facilitates processing of the sealing ring 70 but also saves raw material. Specifically, D33 may be 0.5 mm, 0.75 mm, or 1 mm.

[0050] In this embodiment, the annular groove 52 is located in the middle of the valve head 30. By providing the annular groove 52 in the middle of the valve head 30, the structural strength of the valve head 30 and the annular groove 52 can be ensured. Furthermore, by providing the annular groove 52 in the middle of the valve head 30, the possibility of the sealing ring 70 being pulled out of the annular groove 52 can be reduced.

[0051] Here, the distance from the center line perpendicular to the axis of the annular groove 52 to the end of the valve head 30 is L32, and L32 is 35% to 65% of the length L33 of the valve head 30. If L32 is less than 35% of L33 or greater than 65% of L33, the annular groove 52 will tend to reduce the structural strength of the valve head 30 as it approaches the edge of the valve head 30. Therefore, by setting L32 to 35% to 65% of L33, the structural strength of the valve head 30 can be increased. Specifically, L32 may be 50% of L33.

[0052] Assuming the above ratio is satisfied, the distance L32 from the center line perpendicular to the axis of the annular groove 52 to the end of the valve head 30 is in the range of 6.5 mm to 8 mm. If L32 is less than 6.5 mm, the overall length of the valve head 30 will be relatively short, which will be disadvantageous to the processing and flow rate control of the product. If L32 is greater than 8 mm, the overall length of the valve head 30 will be relatively long, which will increase the structural dimensions of the valve disc 10 and increase the cost of the product. Therefore, by setting L32 in the range of 6.5 mm to 8 mm, the structural strength of the valve head 30 can be ensured and flow rate control will be facilitated. Specifically, L32 may be 6.5 mm, 7.5 mm, or 8 mm.

[0053] When the technical aspects of the present application are applied, an annular groove 52 is formed on the outer wall of the valve head 30, and a sealing ring 70 is disposed between the first guide hole 201 and the annular groove 52, thereby firmly holding the sealing ring 70 between the first guide hole 201 and the valve head 30. By setting the difference between D32 and D31 to a range of 0.1 mm to 0.5 mm, the sealing effect between the guide sleeve 20 and the valve head 30 can be relatively good and the sealing ring 70 can be made less susceptible to wear. The inner diameter of the annular groove 52 is D34, and the inner diameter of the sealing ring 70 is D35. The difference between D34 and D35 is set to a range of -0.5 mm to 0.5 mm, which not only improves the sealing performance of the sealing ring 70 but also ensures a relatively long lifespan of the sealing ring 70. The width of the annular groove 52 along the axial direction is L31, and the cross-sectional diameter of the sealing ring 70 is D33. By making L31 1.1 to 1.4 times D33, the sealing ring 70 can be stably installed within the annular groove 52, and excessive wear of the sealing ring 70 can also be prevented.

[0054] 11 and 12, the present application provides an electronic expansion valve including a valve body 10 including a valve seat 11, and further including a valve head 30. Here, the valve seat 11 has a valve chamber 1101 and a valve port 102, and the valve port 102 has a first tapered hole segment 1021, a straight hole segment 1022, and a second tapered hole segment 1023 connected in order, the diameter of the first tapered hole segment 1021 at an end remote from the straight hole segment 1022 is larger than the diameter of the end connected to the straight hole segment 1022 of the first tapered hole segment 1021, and the diameter of the second tapered hole segment 1023 at an end remote from the straight hole segment 1022 is larger than the diameter of the end connected to the second tapered hole segment 1023. The length L41 of the straight hole segment 1022 is 0.5 mm to 1.5 mm, and the taper angle A4 of the second tapered hole segment 1023 is 20° to 60°. The valve head 30 is movably disposed within the valve chamber 1101, and the valve head 30 has a closing position for closing the valve port 102 and an opening position for opening the valve port 102.

[0055] Here, if the length L41 of the straight hole segment 1022 is greater than 1.5 mm and the taper angle A4 of the second tapered hole segment 1023 is less than 20°, the flow rate of the fluid flowing through the valve orifice 102 increases. If the length L41 of the straight hole segment 1022 is less than 0.5 mm and the taper angle A4 of the second tapered hole segment 1023 is greater than 60°, the flow rate of the fluid flowing through the valve orifice 102 decreases. Both of these settings reduce the flow coefficient of the valve orifice 102, increasing the pressure loss when the fluid flows through the valve orifice 102 and correspondingly reducing the internal leakage prevention performance of the device. Therefore, in the present application, by setting the length L41 of the straight hole segment 1022 between 0.5 mm and 1.5 mm, setting the taper angle A4 of the second tapered hole segment 1023 between 20° and 60°, and providing the second tapered hole segment 1023, the length L41 of the straight hole segment 1022 can be shortened, and by replacing the lower end of the straight hole segment 1022 with a tapered surface, the flow resistance between the straight hole segment 1022 and the inner wall of the valve orifice 102 when the fluid flows through the valve orifice 102 can be reduced, the pressure loss when the fluid flows through the valve orifice 102 can be reduced, and the flow coefficient of the valve orifice 102 can be effectively improved. Specifically, the length L41 of the straight hole segment 1022 can be 0.5 mm, 1 mm, or 1.5 mm, and the taper angle A4 of the second tapered hole segment 1023 can be 20°, 50°, or 60°.

[0056] By providing the above structure, the valve port 102 is configured as a three-stage structure consisting of a first tapered hole segment 1021, a straight hole segment 1022, and a second tapered hole segment 1023 connected in sequence, and at the same time, the length L41 of the straight hole segment 1022 is set to between 0.5 mm and 1.5 mm, and the taper angle A4 of the second tapered hole segment 1023 is set to between 20° and 60°. This effectively improves the flow coefficient of the valve port 102 and reduces the pressure loss when the fluid flows through the valve port 102. At the same time, it also improves the internal leakage prevention performance of the device and ensures the stability of the device during operation.

[0057] Furthermore, the valve head 30 has a first outer wall, which engages with the inner wall of the first tapered bore segment 1021 to close the valve port 102. The first outer wall has a diameter D41, where D41 is 5 mm to 8 mm. This simplifies the structure of the valve head 30, facilitating processing and reducing manufacturing costs. Furthermore, the diameter D41 of the first outer wall can be set between 5 mm and 8 mm to accommodate electronic expansion valves of different sizes, thereby improving the applicability of the valve head 30. Specifically, the diameter D of the first outer wall may be 5 mm, 6 mm, or 8 mm.

[0058] 13, the diameter of the straight hole segment 1022 is D42, where D41-D42≧0.2 mm. In this way, when the valve head 30 and the valve orifice 102 are sealed, the entire valve head 30 can be covered by the outer periphery of the straight hole segment 1022, and the sealing of the device can be more reliable. Here, the value of D41-D42 can be 0.2 mm, 0.5 mm, or 0.7 mm.

[0059] Furthermore, the taper angle of the first tapered hole segment 1021 is greater than the taper angle of the second tapered hole segment 1023. By providing the straight hole segment 1022 as described above, it becomes possible for the straight hole segment 1022 to be adapted to valve heads 30 of different specifications, and in this way, when the straight hole segment 1022 and the valve head 30 are engaged and connected, the straight hole segment 1022 can easily adjust the flow rate of the fluid flowing out from the valve seat 11, thereby making it easier to control the flow rate of the fluid in the device.

[0060] Specifically, the taper angle of the first tapered hole segment 1021 is B4, and the value of B4 is 25° to 65°. This provides more selectable angles for the taper angle of the first tapered hole segment 1021, increasing the adjustment range for the flow rate of the first tapered hole segment 1021 and making it easier to control the flow rate of the device. Specifically, the taper angle B4 of the first tapered hole segment 1021 may be 25°, 30°, or 65°.

[0061] Furthermore, the maximum diameter of the first tapered bore segment 1021 is greater than the maximum diameter of the second tapered bore segment 1023. This advantageously increases the fluid flow space at the valve orifice 102 adjacent the valve chamber 1101, thereby increasing the maximum flow area of ​​the device.

[0062] Specifically, the first tapered hole segment 1021 has a maximum diameter D43, which is 6 mm to 9.5 mm, and the second tapered hole segment 1023 has a maximum diameter D44, which is 7 mm to 8.5 mm. By providing the above, the flow rate of the fluid can be adjusted while reducing the flow resistance when the fluid flows through the valve port 102, thereby improving the operating efficiency of the device. Here, the maximum diameter D of the straight hole segment 1022 can be 6 mm, 7 mm, or 9.5 mm.

[0063] The electronic expansion valve further includes a guide sleeve 20 that is fixed to the valve seat 11, a portion of which is located within the valve chamber 1101, and within which the valve head 30 is movably mounted. This arrangement allows the guide sleeve 20 to be fixedly connected to the valve seat 11, and the guide sleeve 20 can guide the valve head 30 to ensure stable axial movement of the valve head 30.

[0064] The valve seat 11 further includes a first hole segment 111 and a second hole segment 112, which are stepped along the axis, one end of the second hole segment 112 connected to the first hole segment 111 and the other end of the second hole segment 112 connected to the valve chamber 1101, the diameter of the first hole segment 111 being larger than the diameter of the second hole segment 112, and a transition fit between the guide sleeve 20 and the second hole segment 112. The above structure allows the guide sleeve 20 to be fixedly connected to the valve seat 11, preventing the guide sleeve 20 from being displaced during operation of the device and ensuring the stability of the device during operation.

[0065] According to the technical aspects provided by the present application, the valve port 102 is configured as a three-stage structure consisting of a straight hole segment 1022, a straight hole segment 1022, and a second tapered hole segment 1023 connected in sequence. At the same time, the length L41 of the straight hole segment 1022 is set between 0.5 mm and 1.5 mm, and the taper angle A4 of the second tapered hole segment 1023 is set between 20° and 60°. This effectively improves the flow coefficient of the valve port 102 and reduces the pressure loss when the fluid flows through the valve port 102. At the same time, this improves the internal leakage prevention performance of the device and ensures the stability of the device during operation. At the same time, the guide sleeve 20 and the valve seat 11 are fixedly connected, which prevents the guide sleeve 20 from displacing during operation of the device and ensures the stability of the device during operation.

[0066] As shown in FIGS. 14 to 18, the electronic expansion valve provided in the present application includes a valve body 10, and the valve body 10 includes a valve seat 11. The valve seat 11 has a first hole segment 111, a second hole segment 112, and a valve chamber 1101, which are connected sequentially along an axis. The valve seat 11 has a valve port 102, which is connected to one end of the valve chamber 1101 away from the second hole segment 112. The diameter of the second hole segment 112 is smaller than that of the first hole segment 111. The guide sleeve 20 is fixedly mounted on the valve seat 11. The guide sleeve 20 has a connecting segment 21 and a guide segment 22, which are connected to each other along an axis. The connecting segment 21 is arranged corresponding to the first hole segment 111 and the second hole segment 112. The guide segment 22 is located in the valve chamber 1101. The connecting segment 21 has an annular weld ring groove 23 on its outer wall. The diameter of the first hole segment 111 is D51, and the diameter of the connecting segment 21 is D53, where 0.1 mm≧D51-D53≧0.02 mm.

[0067] If D51-D53 is less than or equal to 0.02, the gap between the first hole segment 111 and the connecting segment 21 is reduced, reducing the area through which the weld ring penetrates the gap and further degrading the welding quality. If D51-D53 is greater than or equal to 0.1 mm, the gap between the first hole segment 111 and the connecting segment 21 is increased, which is unfavorable for assembling and welding the guide sleeve 20 and the valve seat 11. Furthermore, to ensure welding quality, an increased weld ring is required, increasing manufacturing costs. Therefore, in this application, welding quality can be ensured by setting the value of D51-D53 between 0.02 mm and 0.1 mm. Specifically, the value of D51-D53 may be 0.02 mm, 0.05 mm, or 0.1 mm.

[0068] With the above structure, the diameter of the first hole segment 111 is made larger than the diameter of the connection segment 21, thereby creating a gap between the first hole segment 111 and the connection segment 21, and the gap between the two is set to between 0.02 mm and 0.1 mm, which allows a weld bead to be formed between the connection segment 21 and the first hole segment 111.Furthermore, when welding, the weld ring in the weld ring groove 23 can easily melt and penetrate into the weld bead.In this way, the reliability of the welding between the guide sleeve 20 and the valve seat 11 can be improved, and the engagement between the guide sleeve 20 and the valve seat 11 after welding can be made tighter and stronger.

[0069] Furthermore, the connection segment 21 and the second hole segment 112 are interference-fitted. In this manner, the second hole segment 112 can be used to limit the position of the connection segment 21 on the valve seat 11, making it easier to position the guide sleeve 20 during installation and improving the stability of the device after assembly.

[0070] Specifically, the diameter of the second hole segment 112 is D52, where 0.05 mm ≧ D53 - D52 ≧ 0 mm. By setting the gap between them between 0 and 0.05 mm, the positioning action between the valve seat 11 and the guide sleeve 20 can be further improved, and at the same time, it is also possible to easily position the guide sleeve 20 within the second hole segment 112 when installing it. By limiting the above range, the stability of the device assembly is improved. Here, the value of D53 - D52 may be 0 mm, 0.02 mm, or 0.05 mm.

[0071] Furthermore, the diameter of the second hole segment 112 is D52, where D51-D52≧0.02 mm. By making the diameter of the first hole segment 111 larger than the diameter of the second hole segment 112, the first hole segment 111 and the second hole segment 112 are arranged in a stepped shape, which is advantageous for the valve seat 11 to guide the guide sleeve 20 during the installation process, making the installation of the guide sleeve 20 easier and improving assembly efficiency. Specifically, the value of D51-D52 may be 0.02 mm, 0.04 mm, or 0.06 mm.

[0072] The connection segment 21 further includes a first connection segment 211 and a second connection segment 212, the weld ring groove 23 is located between the first connection segment 211 and the second connection segment 212, and the second connection segment 212 is located within the second hole segment 112. The second connection segment 212 has a height L51, a height L52, and a distance L53 between one end of the first connection segment 211 adjacent to the valve port 102 and one end of the connection segment 21 adjacent to the valve port 102, where L53 > L52 > L51. This configuration allows for a non-closed weld bead structure to be constructed, making it easier to fill the weld ring. Furthermore, the weld ring is located between the first hole segment 111, the second hole segment 112, the first connection segment 211, and the second connection segment 212, thereby improving the welding quality between the valve seat 11 and the guide sleeve 20.

[0073] Specifically, L51≧1 mm. In this way, the guide sleeve can be stably fixed in the valve body, and an effective connection between the guide sleeve and the valve body can be ensured, which is advantageous for further improving the welding quality between the valve seat 11 and the guide sleeve 20. Here, the value of L51 may be 1 mm, 2 mm, or 3 mm.

[0074] 17, the height of the first connecting segment 211 is L54, where L54 is greater than or equal to 0.5 mm. This ensures an effective welding length between the valve body and the guide sleeve 20, further improving the quality of the weld between the valve body and the guide sleeve 20 and the structural strength of the device after welding. Specifically, the value of L54 may be 0.5 mm, 0.8 mm, or 0.9 mm.

[0075] 18 , the electronic expansion valve further includes a housing 12, a nut sleeve 80, and a screw 40. The housing 12 is connected to the valve seat 11, and a mounting chamber 121 is formed between the housing 12 and the valve seat 11. The nut sleeve 80 is disposed within the mounting chamber 121, and the screw 40 is movably disposed within the mounting chamber 121. The screw 40 is inserted into and threadedly engaged with the nut sleeve 80. The valve head 30 is movably disposed within the guide sleeve 20, and the valve head 30 is drivingly connected to the screw 40, which is used to drive the valve head 30 to open or close the valve port 102. The valve head 30 moves between an open position and a closed position, thereby connecting the mounting chamber 121 and the valve chamber 1101, ensuring stable operation of the device.

[0076] According to the technical aspect provided by the present application, the diameter of the first hole segment 111 is made larger than the diameter of the connecting segment 21, thereby providing a gap between the first hole segment 111 and the connecting segment 21, and the gap is set to be between 0.02 mm and 0.1 mm. This gap allows a weld bead to be formed between the connecting segment 21 and the first hole segment 111, and further, during welding, the weld ring in the weld ring groove 23 can easily melt and penetrate into the weld bead, thereby improving the reliability of the welding between the guide sleeve 20 and the valve seat 11 and making the engagement between the guide sleeve 20 and the valve seat 11 tighter and stronger after welding. At the same time, the valve head 30 can move between the open position and the closed position to communicate between the mounting chamber 121 and the valve chamber 1101, ensuring the stability of the device during operation.

[0077] 19, the electronic expansion valve provided in the embodiment of the present application includes a valve body 10 and a guide sleeve 20. The valve body 10 has an accommodating chamber 101, a first opening 103 on the side wall of the valve body 10, a second opening 104 at the bottom end of the valve body 10, a valve port 102 on the valve body 10, the valve port 102 and the second opening 104 are coaxial, and the second opening 104 is connected to the accommodating chamber 101 through the valve port 102, a guide sleeve 20 is installed in the accommodating chamber 101, the guide sleeve 20 is fixedly connected to the valve body 10, the guide sleeve 20 and the valve port 102 are coaxial, and the guide sleeve 20 is fixedly connected to the valve body 10. The sleeve 20 includes a connecting segment 21, a first cylindrical segment 24, a buffering segment 25, and a second cylindrical segment 26, which are connected in sequence. The connecting segment 21 is used for fixed connection to the valve disc 10. The second cylindrical segment 26 is located close to the valve orifice 102. The diameter of the second cylindrical segment 26 is smaller than that of the first cylindrical segment 24. The diameter of the buffering segment 25 gradually decreases from the first cylindrical segment 24 to the second cylindrical segment 26. The gradually decreasing diameter of the buffering segment 25 can reduce the impact force of the fluid when it flows toward the side wall of the guide sleeve 20 and can also be used to guide the fluid. Here, the buffering segment 25 may have a tapered structure with an outer wall having an inclined surface, or may have a tapered structure with an outer wall having an arcuate surface, or may be formed by sequentially connecting multiple step segments of decreasing size.

[0078] According to the technical aspects of the present application, the guide sleeve 20 includes a connecting segment 21, a first cylindrical segment 24, a buffer segment 25, and a second cylindrical segment 26, which are arranged in sequence. The second cylindrical segment 26 is located adjacent to the valve port 102. The diameter of the buffer segment 25 gradually decreases from the first cylindrical segment 24 to the second cylindrical segment 26. The provision of the buffer segment 25 reduces the impact force experienced by the fluid when it flows from the first opening 103 to the outer wall of the guide sleeve 20, and the buffer segment 25 guides the fluid to flow along the side wall of the guide sleeve 20 toward the second opening 104, thereby increasing the fluid flow rate per unit time. Furthermore, by making the diameter of the second cylindrical segment 26 smaller than that of the first cylindrical segment 24, the flow space within the accommodating chamber 101 can be increased, thereby further increasing the fluid flow rate per unit time of the electronic expansion valve.

[0079] As shown in FIG. 21 , the diameter of the first cylindrical segment 24 is D61, and the diameter of the second cylindrical segment 26 is D62, where D61-D62 ≥ 1 mm. If D61-D62 < 1 mm, the diameter of the second cylindrical segment 26 is relatively large, reducing the space of the accommodating chamber, i.e., the fluid flow space is relatively small, which may further reduce the fluid flow rate of the electronic expansion valve per unit time. Therefore, if D61-D62 ≥ 1 mm, the flow space within the electronic expansion valve can be increased, thereby increasing the fluid flow rate of the electronic expansion valve per unit time. Specifically, D61-D62 may be 1 mm or 2 mm.

[0080] As shown in FIG. 20 , specifically, the buffer segment 25 is a cone segment, and the taper angle of the buffer segment 25 is δ, which ranges from 30° to 90°. If δ is less than 30°, the inclination angle of the side surface of the buffer segment 25 becomes small, thereby weakening the guiding function of the buffer segment 25. If δ is greater than 90°, the inclination angle of the buffer segment 25 becomes relatively large, the length of the buffer segment 25 becomes relatively short, and the buffering function of the buffer segment 25 becomes weak. Therefore, by setting δ in the range of 30° to 90°, the buffer segment 25 can have good buffering and guiding functions. Specifically, δ may be 20°, 50°, or 90°.

[0081] In this embodiment, the diameter of one end of the conical segment close to the valve orifice 102 is equal to the diameter of the second cylindrical segment 26, and the diameter of one end of the conical segment away from the valve orifice 102 is equal to the diameter of the first cylindrical segment 24. In this configuration, the outer surface of the guide sleeve 20 is continuous and smooth, which reduces the impact force experienced by the fluid as it flows into the guide sleeve 20 and also increases the fluid flow rate.

[0082] 20 , in this embodiment, the electronic expansion valve further includes a connecting pipe 1031 connected to the first opening 103. The bottom of the guide sleeve 20 is higher than the bottom of the inner wall of the connecting pipe 1031. The distance between the bottom of the inner wall of the connecting pipe 1031 and the bottom of the guide sleeve 20 is L61, which is 1 mm or more. If L61 is less than 1 mm, the guide sleeve 20 will significantly block the opening of the connecting pipe 1031, reducing the flow rate of fluid from the connecting pipe 1031 to the second opening 104. Therefore, if L61 is 1 mm or more, the flow rate of fluid through the electronic expansion valve can be increased. Specifically, L61 may be 1 mm, 2 mm, or 3 mm.

[0083] Specifically, in the radial direction of the connecting pipe 1031, the end face of the bottom end of the guide sleeve 20 is disposed close to the axis of the connecting pipe 1031. This not only ensures that the length requirement of the guide sleeve 20 is met, but also makes it possible to make the blocked portion of the opening of the connecting pipe 1031 relatively small, thereby increasing the flow rate of fluid through the electronic expansion valve.

[0084] Specifically, one end of the buffer segment 25 remote from the valve port 102 is higher than the tip of the inner wall of the connecting pipe 1031. By providing it in this manner, the diameter of the portion of the guide sleeve 20 facing the connecting pipe 1031 becomes relatively small, and further, the range of the opening of the connecting pipe 1031 that is blocked by the guide sleeve 20 can be reduced, and the flow rate of the fluid becomes relatively large.

[0085] 20 , in this embodiment, the distance between the end of the buffer segment 25 remote from the valve port 102 and the tip of the inner wall of the connecting pipe 1031 is L62, which is 1 mm or greater. If L62 were less than 1 mm, the diameter of the portion of the buffer segment 25 facing the connecting pipe 1031 would be relatively large, blocking a larger portion of the opening of the connecting pipe 1031. Therefore, by making L62 1 mm or greater, the blocked area of ​​the opening of the connecting pipe 1031 can be relatively small, and the fluid flow rate of the electronic expansion valve per unit time can be relatively large. Specifically, L62 may be 1 mm, 2 mm, or 2.5 mm.

[0086] As shown in FIG. 21 , in this embodiment, the diameter D61 of the first cylindrical segment 24 ranges from 8.5 mm to 13 mm. The valve head 30 is movably mounted within the guide sleeve 20 and is used to close or open the valve port 102. If the diameter D61 of the first cylindrical segment 24 is smaller than 8.5 mm, the inner diameter of the guide sleeve 20 will be too small, the diameter of the valve head 30 will be too small, and the valve head 30 will not be able to meet the requirements for closing the valve port 102. If the diameter of the first cylindrical segment 24 is larger than 13 mm, the structural dimensions of the guide sleeve 20 will be too large, which will in turn result in the structural dimensions of the valve disc 10 being too large. Therefore, by setting the diameter D61 of the first cylindrical segment 24 to be in the range of 8.5 mm to 13 mm, not only can the valve disc 30 meet the requirements, but the structure of the valve disc 10 can also be made compact, thereby saving the space occupied by the electronic expansion valve. Specifically, D61 may be 8.5 mm, 11 mm, or 13 mm.

[0087] As shown in FIG. 20, specifically, the diameter of the inner wall of the connecting pipe 1031 is D63, and D63 ranges from 8 mm to 14 mm. If D63 is smaller than 8 mm, the inner diameter of the connecting pipe 1031 becomes relatively small, resulting in a relatively small fluid flow rate in the electronic expansion valve. If D63 is larger than 14 mm, the inner diameter of the connecting pipe 1031 becomes relatively large, resulting in a relatively large volume of the electronic expansion valve. Therefore, by setting D63 in the range of 8 mm to 14 mm, not only can the fluid flow rate in the electronic expansion valve be relatively large, but also the structure of the electronic expansion valve can be ensured to be compact. Specifically, D63 may be 8 mm, 12 mm, or 14 mm.

[0088] When the technical aspects of the present application are applied, the second cylindrical segment 26 is disposed close to the valve port 102, and the diameter of the buffer segment 25 gradually decreases from the first cylindrical segment 24 to the second cylindrical segment 26. By providing the buffer segment 25, the impact force experienced by the fluid flowing from the first opening 103 to the guide sleeve 20 is relatively small, and the buffer segment 25 guides the fluid to flow along the guide sleeve 20 toward the second opening 104, thereby increasing the fluid flow rate of the electronic expansion valve per unit time. The diameter of the second cylindrical segment 26 is smaller than that of the first cylindrical segment 24, and the relatively small diameter of the second cylindrical segment 26 increases the space within the accommodating chamber 101, making the fluid flow space relatively large and thereby increasing the fluid flow rate of the electronic expansion valve per unit time. The first cylindrical segment 24 has a diameter D61, the second cylindrical segment 26 has a diameter D62, and D61-D62 is greater than or equal to 1 mm, so that the fluid flow space within the electronic expansion valve can be made relatively large, and the fluid flow rate per unit time of the electronic expansion valve can be made relatively large.

[0089] 22 to 24, an embodiment of the present application provides an electronic expansion valve including a valve element 10 and a nut sleeve 80. The valve element 10 has a valve chamber 1101 and a valve port 102, the valve chamber 1101 and the valve port 102 are connected to each other, and the valve chamber 1101 includes a first mounting segment 11011 and a second mounting segment 11012 that are stepped, and the inner diameter of the first mounting segment 11011 is larger than the inner diameter of the second mounting segment 11012. The first mounting segment 11011 and the second mounting segment 11012 are mounted on the inner wall of the valve chamber 1101, and the first mounting segment 11011 and the second mounting segment 11012 are integral with the valve element 10. An annular mounting plate 81 is provided on the outer periphery of the nut sleeve 80. The annular mounting plate 81 is located within the first mounting segment 11011. The annular mounting plate 81 is welded to the inner wall of the first mounting segment 11011, and the annular mounting plate 81 is clearance-fitted to the side surface of the first mounting segment 11011. The nut sleeve 80 has a second guide hole 801 at one end adjacent to the valve port 102. The electronic expansion valve further includes a guide sleeve 20, a portion of which is located within the valve chamber 1101 and is located at one end of the nut sleeve 80 adjacent to the valve port 102, with one end remote from the valve port 102 inserted into the second guide hole 801, coaxial with the nut sleeve 80, and interference-fitted with the second guide hole 801. This structure allows good concentricity to be maintained between the guide sleeve 20 and the nut sleeve 80. By providing a fixed connection between the nut sleeve 80 and the guide sleeve 20, when welding the annular mounting plate 81, the nut sleeve 80 and the valve body 10 are guided and positioned by the engagement between the guide sleeve 20 and the second guide hole 801, further improving the coaxiality of the two, and by using the above structure for positioning, it is possible to reduce the influence on the coaxiality when welding the annular mounting plate 81 and the first mounting segment 11011. Alternatively, the annular mounting plate 81 and the nut sleeve 80 may be separate structures or may be provided as an integrated structure.The annular mounting plate 81 is overlapped on the step surface between the first mounting segment 11011 and the second mounting segment 11012 to enhance the stability of the annular mounting plate 81 .

[0090] When the technical aspects of the present application are applied, the annular mounting plate 81 and the first mounting segment 11011 are clearance-fitted, and the guide sleeve 20 and the nut sleeve 80 are coaxially arranged and interference-fitted. Therefore, when the annular mounting plate 81 is welded, the nut sleeve 80 and the valve body 10 are guided and positioned by the engagement between the guide sleeve 20 and the second guide hole 801, ensuring concentricity between the two. Furthermore, when the first mounting segment 11011 and the annular mounting plate 81 are welded together, the annular mounting plate 81 has some deformation margin due to heat, reducing the possibility of the annular mounting plate 81 warping up from the first mounting segment 11011 and ensuring relatively good concentricity between the nut sleeve 80 and the valve body 10.

[0091] In this embodiment, the inner diameter of the first mounting segment 11011 is D71, the outer diameter of the annular mounting plate 81 is D72, and the range of D71-D72 is 0.02 mm to 0.08 mm. If D71-D72 is less than 0.02 mm, the gap between the annular mounting plate 81 and the first mounting segment 11011 will be too small, which will cause the annular mounting plate 81 to deform and warp during welding. If D71-D72 is more than 0.08 mm, the gap between the annular mounting plate 81 and the first mounting segment 11011 will be too large, which will make welding the annular mounting plate 81 and the first mounting segment 11011 difficult and result in relatively low concentricity. Therefore, by setting the range of D71-D72 to 0.02 mm to 0.08 mm, the difficulty of welding the annular mounting plate 81 and the first mounting segment 11011 can be reduced, and the annular mounting plate 81 is less likely to deform and warp during welding, allowing the two to maintain good coaxiality.

[0092] 25, specifically, the inner diameter of the second guide hole 801 is D73, and the outer diameter of the end of the guide sleeve 20 away from the valve orifice 102 is D74, where 0≦D74−D73≦0.1 mm. If D74−D73 is smaller than 0, the guide sleeve 20 and the second guide hole 801 will be clearance-fitted, and when the annular mounting plate 81 is welded, the engagement between the guide sleeve 20 and the second guide hole 801 will not be able to guide and position the nut sleeve 80 and the valve disc 10. If D74-D73 is greater than 0.1 mm, it is difficult or impossible to install the guide sleeve 20 in the second guide hole 801. Therefore, by setting D74-D73 between 0 and 0.1 mm, the guide sleeve 20 and the second guide hole 801 can be interference-fit. Furthermore, when the annular mounting plate 81 is welded, the engagement between the guide sleeve 20 and the second guide hole 801 guides and positions the guide sleeve 20. This not only improves the coaxiality between the valve body 10 and the nut sleeve 80, but also makes it relatively easy to install the guide sleeve 20 in the second guide hole 801. Specifically, D74-D73 may be 0, 0.03 mm, 0.06 mm, or 0.1 mm.

[0093] Specifically, 6.5 mm≦D74≦8 mm. From the above, it can be understood that 6.44 mm≦D73≦8 mm. In this embodiment, D74 may be 6.5 mm, 7 mm, or 8 mm, and D73 may be 6.44 mm, 6.95 mm, or 8 mm.

[0094] In this embodiment, the thickness of the annular mounting plate 81 is L71, and the height of the first mounting segment 11011 is L72, where L71 is greater than L72. The nut sleeve 80 is typically made of a plastic material. By making L71 greater than L72, the first mounting segment 11011 can reflect the laser away from the nut sleeve 80 during welding, preventing the nut sleeve 80 from being heated and deformed when the laser is irradiated on it.

[0095] Specifically, the thickness L71 of the annular mounting plate 81 is in the range of 0.3 mm to 1.2 mm. If L71 is less than 0.3 mm, the structural strength of the annular mounting plate 81 becomes relatively small, and the annular mounting plate 81 cannot stably support the nut sleeve 80. If L71 is greater than 1.2 mm, the space occupied by the annular mounting plate 81 becomes relatively large, and the volume of the valve body 10 becomes relatively large. Therefore, by setting L71 in the range of 0.3 mm to 1.2 mm, not only can the structural strength of the nut sleeve 80 be relatively high, but the space occupied by the annular mounting plate 81 can also be relatively small. Specifically, L71 may be 0.3 mm, 0.6 mm, 1 mm, or 1.2 mm.

[0096] Specifically, the range of the inner diameter D71 of the first mounting segment 11011 is 13 mm to 15 mm. Here, D71 may be 13 mm, 14 mm, or 15 mm.

[0097] In this embodiment, the valve element 10 includes a valve seat 11 and a housing 12. The valve seat 11 is provided with a valve chamber 1101 and a valve port 102. The valve chamber 1101 is located at one end of the valve seat 11, and the valve port 102 is located at the other end of the valve seat 11. The housing 12 is connected to the end of the valve seat 11 where the valve chamber 1101 is located, and the housing 12 is covered on the outside of the nut sleeve 80. The first mounting segment 11011 and the second mounting segment 11012 are located at one end of the valve chamber 1101 remote from the valve port 102. The second mounting segment 11012 and the inner wall of the valve chamber 1101 are flush with each other. The inner wall of the valve chamber 1101 is provided at one end remote from the valve port 102 with a groove having an L7 cross section, which forms the first mounting segment 11011 and the second mounting segment 11012.

[0098] In this embodiment, the nut sleeve 80 is further provided with a second connecting hole 802 communicating with the second guide hole 801, the second connecting hole 802 being located at one end of the second guide hole 801 away from the valve port 102, the second connecting hole 802 and the second guide hole 801 being coaxial, and the electronic expansion valve further includes a screw 40 inserted into the nut sleeve 80 and screwed into the second connecting hole 802. The second connecting hole 802 is a threaded hole, and the screw 40 is screwed into the second connecting hole 802, so that the screw 40 moves linearly along the second connecting hole 802 when rotating.

[0099] In this embodiment, the electronic expansion valve further includes a valve head 30 that is movably installed within the guide sleeve 20, fixedly connected to one end of the screw 40 adjacent to the valve port 102, and moved by the driving of the screw 40 to close or open the valve port 102. The screw 40, the valve head 30, and the valve port 102 are arranged coaxially. When the screw 40 rotates, it makes a linear movement along the second connecting hole 802, and the screw 40 drives the valve head 30 to make a linear movement, so that the valve head 30 closes or opens the valve port 102.

[0100] When the technical aspects of the present application are applied, the annular mounting plate 81 and the first mounting segment 11011 are clearance-fitted, so that when the first mounting segment 11011 and the annular mounting plate 81 are welded together, the annular mounting plate 81 has a margin for deformation due to heat, reducing the possibility of the annular mounting plate 81 warping up from the first mounting segment 11011 and achieving relatively good coaxiality between the nut sleeve 80 and the valve body 10. By setting the range of D71-D72 to 0.02 mm to 0.08 mm, the difficulty of welding the annular mounting plate 81 and the first mounting segment 11011 can be reduced, and the annular mounting plate 81 is less likely to deform and warp up during welding, allowing them to maintain good coaxiality. The guide sleeve 20 and the second guide hole 801 are interference-fitted, i.e., the nut sleeve 80 and the guide sleeve 20 are fixedly connected. When the annular mounting plate 81 is welded, the nut sleeve 80 and the valve body 10 are guided and positioned by the engagement between the guide sleeve 20 and the second guide hole 801, further improving the coaxiality between them. Furthermore, by using the above structure for positioning, the influence on coaxiality during welding between the annular mounting plate 81 and the first mounting segment 11011 is reduced, further ensuring the coaxiality between the nut sleeve 80 and the valve body 10. The thickness of the annular mounting plate 81 is L71, and the height of the first mounting segment 11011 is L72. By making L71 greater than L72, the first mounting segment 11011 can reflect the laser outward during welding, preventing the nut sleeve 80 from being heated and deformed by the laser irradiation.

[0101] As shown in FIGS. 26 and 28, an embodiment of the present application provides an electronic expansion valve including a valve body 10, a nut sleeve 80 and a guide sleeve 20. The valve body 10 has a chamber 101 and a valve port 102 inside, and the valve port 102 is connected to the chamber 101. The nut sleeve 80 is provided in the chamber 101 and is fixedly connected to the valve body 10. One end of the nut sleeve 80 close to the valve port 102 is provided with a second guide hole 801. The guide sleeve 20 is provided in the chamber 101 and is fixedly connected to the valve body 10. The top of the guide sleeve 20 fits into the second guide hole 801, and the second guide hole 801 and the guide sleeve 20 are interference-fitted. The length of the guide sleeve 20 that fits into the second guide hole 801 is L81, and the diameter of the part of the guide sleeve 20 that fits into the second guide hole 801 is D81, where L81≧D81 / 3. L81≧D81 / 3, that is, by making the major axis ratio of the portion of the guide sleeve 20 that enters the second guide hole 801 greater than 1 / 3, it is possible to strengthen the connection stability between the guide sleeve 20 and the nut sleeve 80. Specifically, L81 may be 5*D81 / 12 or D81 / 3.

[0102] Applying the technical aspects of the present application, an interference fit between the guide sleeve 20 and the second guide hole 801 can be achieved, thereby relatively increasing the reliability of the positioning between the guide sleeve 20 and the nut sleeve 80. The nut sleeve 80 is provided with the second guide hole 801, and the length of the guide sleeve 20 that enters the second guide hole 801 is L81, and the diameter of the portion of the guide sleeve 20 that enters the second guide hole 801 is D81, where L81 ≧ D81 / 3, i.e., the ratio of the length to the diameter of the portion where the guide sleeve 20 and the fixing hole 1 engage with each other is 1 / 3 or more. The relatively large ratio of the major axis to the major axis of the portion where the guide sleeve 20 engages with the second guide hole 801 can further improve the reliability of the positioning between the guide sleeve 20 and the nut sleeve 80, and can further enhance the coaxiality between the screw assembly, the valve core assembly, and the valve port 102, thereby reducing internal leakage of the electronic expansion valve.

[0103] As shown in FIG. 27 , in this embodiment, the length of the second guide hole 801 is L82, where L81≦0.9*L82. During assembly of the electronic expansion valve, the guide sleeve 20 is first attached to the valve disc 10, the second guide hole 801 of the nut sleeve 80 is then interference-fitted with the guide sleeve 20, and finally, the nut sleeve 80 is welded to the valve disc 10. If the length L81 of the guide sleeve 20 extending into the second guide hole 801 is greater than 0.9*L82, the axial gap between the guide sleeve 20 and the second guide hole 801 will be too small, which could cause interference between the guide sleeve 20 and the nut sleeve 80 during assembly of the electronic expansion valve, making it impossible to attach the nut sleeve 80 to the valve disc 10. Therefore, by setting L81 to 0.9*L82 or less, interference between the guide sleeve 20 and the nut sleeve 80 can be prevented during assembly of the electronic expansion valve. Specifically, L81 may be 0.8*L82, 0.6*L82, or 0.9*L82.

[0104] Specifically, the diameter of the second guide hole 801 is D82, and 0≦D81−D82≦0.1 mm. If D81−D82 is less than 0, the second guide hole 801 and the guide sleeve 20 will be clearance-fitted, resulting in an inflexible connection between the guide sleeve 20 and the nut sleeve 80 and reduced reliability in positioning the guide sleeve 20 and the nut sleeve 80. If D81−D82 is greater than 0.1 mm, it will be relatively difficult to install the guide sleeve 20 in the second guide hole 801. Therefore, by setting the relationship 0≦D81−D82≦0.1 mm, interference fit between the second guide hole 801 and the guide sleeve 20 will be achieved, improving the reliability of positioning the guide sleeve 20 and the nut sleeve 80 and enabling quicker and easier installation of the guide sleeve 20 in the second guide hole 801. Specifically, the guide sleeve diameters D81−D82 may be 0, 0.03 mm, or 0.1 mm.

[0105] In this embodiment, the electronic expansion valve further includes a screw 40, a second connecting hole 802 is provided in the nut sleeve 80, the screw 40 and the second connecting hole 802 are threadedly engaged, a second guide hole 801 is provided at one end of the nut sleeve 80 close to the valve port 102, and the second guide hole 801 and the second connecting hole 802 are in communication with each other. The screw 40 and the second connecting hole 802 are threadedly engaged, and when the screw 40 rotates around the second connecting hole 802, the screw 40 moves linearly along the axis of the second connecting hole 802. The screw 40 and the second connecting hole 802 are engaged with each other, which allows the screw 40 to be precisely positioned when moved.

[0106] In this embodiment, the electronic expansion valve further includes a valve head 30 that is movably disposed within the guide sleeve 20, is coaxial with the valve port 102, and is used to close or open the valve port 102. The guide sleeve 20 guides the valve head 30 to prevent the valve head 30 from tilting, and allows the valve head 30 to accurately close or open the valve port 102.

[0107] In this embodiment, the screw 40 and the valve head 30 are arranged coaxially, and one end of the screw 40 adjacent to the valve port 102 is fixedly connected to the valve head 30, and the screw 40 moves the valve head 30 in conjunction with it to close or open the valve port 102. When the screw 40 moves the valve head 30 in conjunction with it, it can be accurately positioned, and the degree to which the valve head 30 opens the valve port 102 can be accurately controlled, which in turn can accurately control the flow rate of the electronic expansion valve.

[0108] Specifically, D81 satisfies the condition 6.5mm≦D81≦8mm. If D81 is less than 6.5mm, the inner diameter of the guide sleeve 20 is relatively small, and the valve head 30 is movably mounted within the guide sleeve 20. This means that the diameter of the valve head 30 is also relatively small, and the valve head 30 cannot meet the requirements for closing the valve port 102. If D81 is greater than 8mm, L81 ≧D81 / 3, and L81 is greater than 8 / 3mm. This results in the lengths of the nut sleeve 80 and the guide sleeve 20 being relatively long, which in turn increases the overall volume of the electronic expansion valve, which is detrimental to the overall miniaturization of the electronic expansion valve. Therefore, by ensuring that 6.5mm≦D81≦8mm, the diameter of the valve head 30 can meet the requirements for closing the valve port 102 and also allows for a compact structure of the electronic expansion valve. Specifically, D81 may be 6.5mm, 7mm, or 8mm.

[0109] Specifically, L82 satisfies the condition 3 mm≦L82≦5 mm. If L82 is less than 3 mm, the length of the second guide hole 801 becomes relatively short, the ratio of the length of the portion of the guide sleeve 20 that fits into the second guide hole 801 becomes relatively small, and the structural stability of the guide sleeve 20 and the nut sleeve 80 becomes relatively low. If L82 is greater than 5 mm, the length of the second guide hole 801 becomes relatively long, and the overall length of the nut sleeve 80 becomes relatively long, which is disadvantageous for the design of a compact electronic expansion valve. Therefore, by satisfying the condition 3 mm≦L82≦5 mm, not only can the ratio of the length of the portion of the guide sleeve 20 that fits into the second guide hole 801 be relatively large, but also the structure of the electronic expansion valve can be made compact. Specifically, L82 may be 3 mm, 4 mm, or 5 mm.

[0110] When the technical aspects of the present application are applied, the guide sleeve 20 and the second guide hole 801 are interference-fitted to fixedly connect the guide sleeve 20 and the nut sleeve 80, thereby improving the reliability of positioning between the guide sleeve 20 and the nut sleeve 80. The nut sleeve 80 is provided with the second guide hole 801, and the length of the guide sleeve 20 that enters the second guide hole 801 is L81, and the diameter of the portion of the guide sleeve 20 that enters the second guide hole 801 is D81, where L81≧D81 / 3, i.e., the ratio of the length to the diameter of the portion where the guide sleeve 20 and the second guide hole 801 are engaged with each other is 1 / 3 or more, and the major axis ratio of the portion where the guide sleeve 20 and the second guide hole 801 are engaged with each other is relatively large, which further improves the reliability of positioning between the guide sleeve 20 and the nut sleeve 80 and further strengthens the structural stability of the screw assembly and the valve core assembly. The length of the second guide hole 801 is L82, and L81≦0.9*L82, so that the guide sleeve 20 and the nut sleeve 80 can be prevented from interfering with each other when assembling the electronic expansion valve.

[0111] It should be noted that the terminology used herein is merely for the purpose of describing specific embodiments and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and further, when the terms "comprises" and / or "comprises" are used herein, they should also be understood to indicate the presence of features, steps, operations, devices, assemblies, and / or combinations thereof.

[0112] Unless otherwise specifically stated, the relative arrangements, formulas, and numerical values ​​of components and steps described in these embodiments do not limit the scope of this application. At the same time, it should be understood that, for convenience of description, the dimensions of each part shown in the drawings are not drawn according to actual proportional relationships. Although techniques, methods, and equipment known to those skilled in the art will not be discussed in detail, the described techniques, methods, and equipment should be considered part of the permitted specification, where appropriate. In all examples shown and discussed herein, any specific values ​​are merely illustrative and should not be construed as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like symbols and letters indicate like elements in the following drawings; therefore, once any element is defined in one drawing, it does not require further description in subsequent drawings.

[0113] In the description of this application, orientations or positional relationships indicated by directional terms such as "front," "rear," "up," "down," "left," "right," "lateral," "longitudinal," "vertical," "horizontal," "top," and "bottom" are generally orientations or positional relationships based on illustrations, and are provided merely for the convenience and simplification of the description of this application. Unless otherwise stated, these directional terms do not indicate or imply that a specified device or element has a particular orientation or must be configured and operated in a particular orientation, and therefore should not be understood as limiting the scope of protection of this application. The directional terms "inside" and "outside" should be understood to mean the inside and outside of the outline of each member itself.

[0114] For convenience of description, spatially relative terms such as "on," "above," "on top of," "on top of," etc. may be used herein to describe the spatial relationship of one illustrated device or feature to another. Spatially relative terms should be understood to encompass different orientations of the device during use or operation in addition to the orientation depicted in the drawings. For example, if a device in the drawings is inverted, a device described as "above other devices or structures" or "on other devices or structures" would thereafter be positioned as "below other devices or structures" or "under other devices or structures." Thus, the exemplary term "above" may encompass both an orientation of "above" and "below." The device may be positioned in other different ways (rotated 90 degrees or at other orientations), and the spatially relative descriptions used herein may be interpreted accordingly.

[0115] It should be further explained that the use of words such as "first" and "second" to define components is merely to easily distinguish corresponding components, and unless otherwise specified, the above words do not have any special meaning and should not be understood as limiting the scope of protection of the present application.

[0116] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included within the protection scope of the present application.

Claims

1. a valve body (10) having a storage chamber (101) and a valve port (102), the valve port (102) communicating with the storage chamber (101); a guide sleeve (20) provided in the receiving chamber (101); a valve head (30) movably provided within the guide sleeve (20), the valve head (30) being used to close or open the valve port (102), the valve head (30) having a balancing passage provided therein, the balancing passage connecting both ends of the valve head (30) to each other; The valve head (30) has a first communication hole (31), a second communication hole (32), and a third communication hole (33) that are sequentially connected along a direction from the first end (301) to the second end (302), The electronic expansion valve is a screw (40) movably provided in the storage chamber (101), one end of which passes through the third communication hole (33) and the second communication hole (32) in that order and enters the first communication hole (31); a valve sleeve (50) having a first gap between the screw (40) and the second communication hole (32), and a second gap between the screw (40) and the valve sleeve (50), the first gap and the second gap being interconnected to form the balancing passage, and the first communication hole (31) and the third communication hole (33) being interconnected by the balancing passage, The valve head (30) has a first end (301) and a second end (302) provided opposite to each other, the first end (301) is used to close the valve port (102), the refrigerant medium and the first end (301) have a first force receiving area S1, the refrigerant medium and the second end (302) have a second force receiving area S2, and the refrigerant medium and the second end (302) have a force receiving area S3. ２ ≦S1-S2≦1.3mm ２ That is, an electronic expansion valve.

2. The diameter of the first communicating hole (31) and the diameter of the third communicating hole (33) are both larger than the diameter of the second communicating hole (32); a valve sleeve (50) located in the first communication hole (31) and fixedly connected to an end of the screw (40), the valve sleeve (50) being restricted in the axial direction by a stepped surface formed by the first communication hole (31) and the second communication hole (32); 2. The electronic expansion valve according to claim 1, wherein an area of ​​an end face of the first end (301) is S11, an area of ​​a stepped surface formed by the first communication hole (31) and the second communication hole (32) is S12, S1 is the sum of S11 and S12, an area of ​​an end face of the second end (302) is S21, an area of ​​a stepped surface formed by the third communication hole (33) and the second communication hole (32) is S22, S2 is the sum of S21 and S22.

3. 3. The electronic expansion valve according to claim 2, wherein the outer diameter of a portion of the valve head (30) corresponding to the first communication hole (31) is D1, the outer diameter of a portion of the valve head (30) corresponding to the third communication hole (33) is D2, D1 = D2, the hole diameter of the first communication hole (31) is d1, the hole diameter of the third communication hole (33) is d2, and −1 mm≦d1−d2≦1 mm.

4. 4. The electronic expansion valve according to claim 3, wherein the outer peripheral surface of the end of the first end (301) is chamfered with a radius R1, and R0.04 mm≦R1≦R0.8 mm.

5. 3. The electronic expansion valve according to claim 2, wherein the outer diameter of the first end (301) is larger than the outer diameter of the second end (302), the difference between the outer diameters of the first end (301) and the second end (302) is 4 mm or less, and the difference between the hole diameter of the first communication hole (31) and the hole diameter of the third communication hole (33) is −1 mm to 1 mm.

6. 6. The electronic expansion valve according to claim 5, wherein the outer peripheral surface of the end of the first end (301) is chamfered with a radius R2, and R0.04 mm≦R2≦R3 mm.

7. 6. The electronic expansion valve according to claim 5, wherein a portion of the valve head (30) corresponding to the first communication hole (31) includes a first segment (311), a transition segment (312), and a second segment (313) connected in sequence along a direction from the first end (301) to the second end (302), wherein the outer diameter of the second segment (313) is smaller than the outer diameter of the first segment (311), and the outer diameter of the transition segment (312) gradually decreases along a direction from the first segment (311) to the second segment (313).

8. the first communication hole (31) includes a first through hole (3101) and a second through hole (3102) that are connected in a stepped manner, the diameter of the first through hole (3101) is larger than the diameter of the second through hole (3102), the first through hole (3101) is provided close to the valve orifice (102), a step surface is formed between the first through hole (3101) and the second through hole (3102), the area of ​​the step surface is S10, and S1 is the sum of S10, S11 and S12; and / or 3. The electronic expansion valve according to claim 2, wherein the third communication hole (33) includes a third through hole (331) and a fourth through hole (332) that are sequentially connected to each other, the fourth through hole (332) is a tapered hole, the diameter of the fourth through hole (332) gradually increases in a direction away from the valve port (102), and the force-receiving area of ​​the fourth through hole (332) is S20, and S2 is the sum of S20, S21, and S22.

9. The electronic expansion valve according to claim 1, wherein the outer peripheral surface of the end of the second end (302) is provided with a chamfer R3.

10. The diameter of the first communicating hole (31) and the diameter of the third communicating hole (33) are both larger than the diameter of the second communicating hole (32); The screw (40) is inserted into the valve head (30) and has a first rod segment (41) and a second rod segment (42) arranged sequentially along the axial direction, and a cross-sectional structure (44) is provided on the side wall thereof, extending from the middle of the first rod segment (41) to the end of the second rod segment (42), and the balancing passage is provided between the cross-sectional structure (44) and the valve head (30). the valve sleeve (50) is located in the first communication hole (31) and has a first connecting hole (51), the second rod segment (42) is connected to the first connecting hole (51), and has the second gap forming the balancing passage between the cross-sectional structure (44) and the first connecting hole (51); 2. The electronic expansion valve according to claim 1, wherein the diameter of the first connecting hole (51) is D3, the maximum value of the second gap is L1, and 0.5*D3>L1>0.1*D3.

11. The cross-sectional area of ​​the second gap is S, and S≧0.8 mm ２ 11. The electronic expansion valve according to claim 10, wherein:

12. 11. The electronic expansion valve according to claim 10, wherein the cross-sectional structure (44) has a length L2 along the axial direction, the first gap is present between the cross-sectional structure (44) and the second communication hole (32), the sum of the lengths of the first gap and the second gap along the axial direction is L3, and L2≧1.3*L3.

13. The electronic expansion valve of claim 12 , wherein the first gap is greater than the second gap.

14. 11. The electronic expansion valve according to claim 10, wherein a distance L4 between one end of the cross-sectional structure (44) remote from the valve sleeve (50) and an upper end surface of the valve head (30) is L4, and L4≦3 mm.

15. 15. The electronic expansion valve according to claim 10, wherein the screw (40) further comprises a third rod segment (43), the third rod segment (43) being connected to one end of the first rod segment (41) remote from the valve orifice (102), the diameter of the third rod segment (43) being larger than the diameter of the first rod segment (41), and a distance L5 between one end of the cross-sectional structure (44) remote from the valve sleeve (50) and one end of the third rod segment (43) close to the valve orifice (102) is L5, and L5≧2*D3.

16. 11. The electronic expansion valve of claim 10, wherein the diameter of the first rod segment (41) is greater than the diameter of the second rod segment (42).

17. The electronic expansion valve is 16. The electronic expansion valve according to claim 15, further comprising a spring (60) fitted to the screw (40), one end of which abuts against a stepped surface between the third communication hole (33) and the second communication hole (32), and the other end of which abuts against a stepped surface between the first rod segment (41) and the third rod segment (43).

18. The guide sleeve (20) is provided with a first guide hole (201), the diameter of which is D31, the valve head (30) is movably inserted into the first guide hole (201), the outer wall of the valve head (30) is provided with an annular groove (52), and the annular groove (52) and the valve head (30) are coaxially arranged. The electronic expansion valve is 2. The electronic expansion valve as claimed in claim 1, further comprising a sealing ring (70) disposed between the first guide hole (201) and the annular groove (52), the sealing ring having an outer diameter D32 greater than D31, and a difference between D32 and D31 ranging from 0.1 mm to 0.5 mm.

19. 19. The electronic expansion valve as claimed in claim 18, wherein the inner diameter of the annular groove (52) is D34, the inner diameter of the sealing ring (70) is D35, and the difference between D34 and D35 is in the range of -0.5mm to 0.5mm.

20. 19. The electronic expansion valve as claimed in claim 18, wherein the width of the annular groove (52) is L31, the cross-sectional diameter of the sealing ring (70) is D33, and L31 is 1.1 to 1.4 times D33.

21. The electronic expansion valve of claim 18, wherein the outer diameter D32 of the sealing ring (70) is in the range of 6.5 mm to 8.5 mm.

22. The electronic expansion valve according to claim 18, wherein the cross-sectional diameter D33 of the sealing ring (70) is in the range of 0.5 mm to 1 mm.

23. 19. The electronic expansion valve as claimed in claim 18, wherein the annular groove (52) is located in the middle of the valve head (30).

24. 19. The electronic expansion valve according to claim 18, wherein a distance from a center line perpendicular to the axis of the annular groove (52) to an end of the valve head (30) is L32, and L32 is 35% to 65% of a length L33 of the valve head (30).

25. 25. The electronic expansion valve according to claim 24, wherein a distance L32 from a center line perpendicular to the axis of the annular groove (52) to an end of the valve head (30) is in the range of 6.5 mm to 8 mm.

26. The valve body (10) includes a valve seat (11), the valve seat (11) having a valve chamber (1101) and the valve orifice (102), the valve orifice (102) having a first tapered hole segment (1021), a straight hole segment (1022) and a second tapered hole segment (1023) connected in order, the diameter of the first tapered hole segment (1021) at an end remote from the straight hole segment (1022) being larger than the diameter of the end of the first tapered hole segment (1021) connected to the straight hole segment (1022), and the diameter of the second tapered hole segment (1023) being larger than the diameter of the end of the first tapered hole segment (1021) connected to the straight hole segment (1022).

2. The electronic expansion valve of claim 1, wherein a diameter of an end of the second tapered hole segment (1023) remote from the straight hole segment (1022) is greater than a diameter of an end of the second tapered hole segment (1023) connected to the straight hole segment (1022), a height of the straight hole segment (1022) is L41, a taper angle of the second tapered hole segment (1023) is A4, a length of the straight hole segment (1022) is 0.5 mm to 1.5 mm, and a taper angle A4 of the second tapered hole segment (1023) is 20° to 60°.

27. 27. The electronic expansion valve of claim 26, wherein the valve head (30) has a first outer wall, the first outer wall and the inner wall of the first tapered hole segment (1021) engage to close the valve port (102), and the first outer wall has a diameter D41, wherein the value of D41 is 5 mm to 8 mm.

28. The electronic expansion valve of claim 26, wherein the diameter of the straight hole segment (1022) is D42, where D41-D42≧0.2 mm.

29. 27. The electronic expansion valve of claim 26, wherein a taper angle of the first tapered bore segment (1021) is greater than a taper angle of the second tapered bore segment (1023).

30. 30. The electronic expansion valve of claim 29, wherein the taper angle of the first tapered hole segment (1021) is B4, and the value of B4 is between 25° and 65°.

31. 27. The electronic expansion valve of claim 26, wherein a maximum diameter of the first tapered bore segment (1021) is greater than a maximum diameter of the second tapered bore segment (1023).

32. 27. The electronic expansion valve of claim 26, wherein the first tapered hole segment (1021) has a maximum diameter D43, the value of D43 being between 6 mm and 9.5 mm, and the second tapered hole segment (1023) has a maximum diameter D44, the value of D44 being between 7 mm and 8.5 mm.

33. 27. The electronic expansion valve of claim 26, wherein the guide sleeve (20) is fixed to the valve seat (11), and a portion of the guide sleeve (20) is located within the valve chamber (1101).

34. 34. The electronic expansion valve of claim 33, wherein the valve seat (11) further comprises a first hole segment (111) and a second hole segment (112) that are stepped along an axis, one end of the second hole segment (112) is connected to the first hole segment (111) and the other end of the second hole segment (112) is connected to the valve chamber (1101), the diameter of the first hole segment (111) is larger than the diameter of the second hole segment (112), and the guide sleeve (20) and the second hole segment (112) are transition-fitted.

35. The valve body (10) includes a valve seat (11), the valve seat (11) having a first hole segment (111), a second hole segment (112), and a valve chamber (1101) connected in sequence along an axis, the valve seat (11) being provided with the valve port (102), the valve port (102) being connected to one end of the valve chamber (1101) remote from the second hole segment (112), and the diameter of the second hole segment (112) being smaller than the diameter of the first hole segment (111); The guide sleeve (20) is fixed to the valve seat (11), and the guide sleeve (20) has a connecting segment (21) and a guide segment (22) connected to each other along an axis, the connecting segment (21) is provided corresponding to the first hole segment (111) and the second hole segment (112), the guide segment (22) is located in the valve chamber (1101), and an outer wall of the connecting segment (21) is provided with an annular weld ring groove (23); 2. The electronic expansion valve according to claim 1, wherein the diameter of the first hole segment (111) is D51, and the diameter of the connecting segment (21) is D53, where 0.1 mm≧D51−D53≧0.02 mm.

36. 36. The electronic expansion valve according to claim 35, wherein the connection segment (21) and the second hole segment (112) are interference-fitted.

37. The electronic expansion valve of claim 36, wherein the diameter of the second hole segment (112) is D52, where 0.05 mm >= D53 - D52 >= 0 mm.

38. The electronic expansion valve of claim 35, wherein the diameter of the second hole segment (112) is D52, where D51-D52≧0.02 mm.

39. 36. The electronic expansion valve of claim 35, wherein the connection segment (21) has a first connection segment (211) and a second connection segment (212), the weld ring groove (23) is located between the first connection segment (211) and the second connection segment (212), the second connection segment (212) is located within the second hole segment (112), the height of the second connection segment (212) is L51, the height of the second hole segment (112) is L52, a distance between one end of the first connection segment (211) adjacent to the valve port (102) and one end of the connection segment (21) adjacent to the valve port (102) is L53, and L53 > L52 > L51.

40. 40. The electronic expansion valve of claim 39, wherein L51 ≥ 1 mm.

41. 40. The electronic expansion valve of claim 39, wherein the height of the first connecting segment (211) is L54, where L54 >= 0.5 mm.

42. The electronic expansion valve is a housing (12) connected to the valve seat (11) and having an attachment chamber (121) between the housing and the valve seat (11); a nut sleeve (80) disposed within the mounting chamber (121); The screw (40) is movably provided in the mounting chamber (121), inserted into the nut sleeve (80), and threadedly engaged with the nut sleeve (80); 36. The electronic expansion valve according to claim 35, wherein the valve head (30) is movably provided within the guide sleeve (20), the valve head (30) is drivingly connected to the screw (40), and the screw (40) is used to drive the valve head (30) to open or close the valve port (102).

43. A first opening (103) is provided in the side wall of the valve body (10), and a second opening (104) is provided at the bottom end of the valve body (10), the valve port (102) and the second opening (104) are provided coaxially, and the second opening (104) is communicated with the storage chamber (101) via the valve port (102), 2. The electronic expansion valve according to claim 1, wherein the guide sleeve (20) is fixedly connected to the valve body (10), the guide sleeve (20) and the valve port (102) are coaxially arranged, the guide sleeve (20) includes a connecting segment (21), a first cylindrical segment (24), a buffer segment (25), and a second cylindrical segment (26) connected in sequence, the connecting segment (21) is used for fixedly connecting to the valve body (10), the second cylindrical segment (26) is arranged close to the valve port (102), the diameter of the second cylindrical segment (26) is smaller than the diameter of the first cylindrical segment (24), and the diameter of the buffer segment (25) gradually decreases in a direction from the first cylindrical segment (24) to the second cylindrical segment (26).

44. 44. The electronic expansion valve of claim 43, wherein the diameter of the first cylindrical segment (24) is D61 and the diameter of the second cylindrical segment (26) is D62, where D61-D62≧1 mm.

45. 44. The electronic expansion valve of claim 43, wherein the buffer segment (25) is a conical segment, and the taper angle of the buffer segment (25) is δ, and δ ranges from 30° to 90°.

46. 46. ​​The electronic expansion valve of claim 45, wherein a diameter of one end of the conical segment proximate the valve orifice (102) is equal to a diameter of the second cylindrical segment (26), and a diameter of one end of the conical segment away from the valve orifice (102) is equal to a diameter of the first cylindrical segment (24).

47. The electronic expansion valve of claim 43, further comprising a connecting pipe (1031), the connecting pipe (1031) is connected to the first opening (103), the bottom end of the guide sleeve (20) is higher than the bottom end of the inner wall of the connecting pipe (1031), and the distance from the bottom end of the inner wall of the connecting pipe (1031) to the bottom end of the guide sleeve (20) is L61, and L61 is 1 mm or more.

48. 48. The electronic expansion valve according to claim 47, wherein, in the radial direction of the connecting pipe (1031), the end face of the bottom end of the guide sleeve (20) is located close to the axis of the connecting pipe (1031).

49. 48. The electronic expansion valve according to claim 47, wherein one end of the buffer segment (25) remote from the valve port (102) is higher than the tip of the inner wall of the connecting pipe (1031).

50. 48. The electronic expansion valve according to claim 47, wherein the distance between one end of the buffer segment (25) remote from the valve port (102) and the tip of the inner wall of the connecting pipe (1031) is L62, and L62 is 1 mm or more.

51. The electronic expansion valve of claim 43, wherein the diameter D61 of the first cylindrical segment (24) is in the range of 8.5 mm to 13 mm.

52. The electronic expansion valve according to claim 47, wherein the diameter of the inner wall of the connecting pipe (1031) is D63, and the range of D63 is 8 mm to 14 mm.

53. The valve body (10) has a valve chamber (1101), the valve chamber (1101) is in communication with the valve port (102), the valve chamber (1101) includes a first mounting segment (11011) and a second mounting segment (11012) that are provided in a stepped shape, and the inner diameter of the first mounting segment (11011) is larger than the inner diameter of the second mounting segment (11012); The electronic expansion valve further includes a nut sleeve (80) having an annular mounting plate (81) on its outer periphery, the annular mounting plate (81) being located within the first mounting segment (11011), the annular mounting plate (81) being welded to the inner wall of the first mounting segment (11011), and a clearance fit between the annular mounting plate (81) and the side of the first mounting segment (11011), 2. The electronic expansion valve according to claim 1, wherein the nut sleeve (80) has a second guide hole (801) at one end thereof adjacent to the valve orifice (102), a portion of the guide sleeve (20) is located within the valve chamber (1101), and the guide sleeve (20) is located at one end of the nut sleeve (80) adjacent to the valve orifice (102), and one end of the guide sleeve (20) remote from the valve orifice (102) is inserted into the second guide hole (801), the guide sleeve (20) and the nut sleeve (80) are arranged coaxially, and the guide sleeve (20) and the second guide hole (801) are interference-fitted.

54. The electronic expansion valve of claim 53, wherein the inner diameter of the first mounting segment (11011) is D71, the outer diameter of the annular mounting plate (81) is D72, and the range of D71-D72 is 0.02 mm to 0.08 mm.

55. 55. The electronic expansion valve of claim 54, wherein the inner diameter of the second guide hole (801) is D73, and the outer diameter of the end of the guide sleeve (20) remote from the valve port (102) is D74, where 0≦D74−D73≦0.1 mm.

56. 56. The electronic expansion valve of claim 55, wherein 6.5 mm≦D74≦8 mm.

57. 54. The electronic expansion valve of claim 53, wherein the thickness of the annular mounting plate (81) is L71 and the height of the first mounting segment (11011) is L72, where L71 is greater than L72.

58. The electronic expansion valve according to claim 57, wherein the thickness L71 of the annular mounting plate (81) is in the range of 0.3 mm to 1.2 mm.

59. The electronic expansion valve of claim 53, wherein the inner diameter D71 of the first mounting segment (11011) is in the range of 13 mm to 15 mm.

60. 54. The electronic expansion valve of claim 53, wherein the valve body (10) includes a valve seat (11) and a housing (12), the valve seat (11) is provided with the valve chamber (1101) and the valve port (102), the valve chamber (1101) is located at one end of the valve seat (11) and the valve port (102) is located at the other end of the valve seat (11), the housing (12) is connected to the end of the valve seat (11) where the valve chamber (1101) is located, and the housing (12) is covered on the outside of the nut sleeve (80).

61. 55. The electronic expansion valve of claim 54, wherein the nut sleeve (80) further includes a second connecting hole (802) communicating with the second guide hole (801), the second connecting hole (802) being located at one end of the second guide hole (801) away from the valve port (102), the second connecting hole (802) and the second guide hole (801) being coaxial, and the electronic expansion valve further includes a screw (40), which is inserted into the nut sleeve (80) and threaded into the second connecting hole (802).

62. 62. The electronic expansion valve according to claim 61, wherein the valve head (30) and one end of the screw (40) adjacent to the valve port (102) are engaged with each other, and the screw (40) drives and moves the valve head (30) to close or open the valve port (102).

63. The electronic expansion valve further includes a nut sleeve (80) disposed in the accommodating chamber (101), fixedly connected to the valve body (10), and having a second guide hole (801) at one end thereof adjacent to the valve port (102); 2. The electronic expansion valve according to claim 1, wherein the guide sleeve (20) is disposed in the accommodating chamber (101), the guide sleeve (20) is fixedly connected to the valve body (10), the top of the guide sleeve (20) is inserted into the second guide hole (801), the second guide hole (801) and the guide sleeve (20) are interference-fitted, the length of the guide sleeve (20) inserted into the second guide hole (801) is L81, and the diameter of the portion of the guide sleeve (20) inserted into the second guide hole (801) is D81, and L81 ≥ D81 / 3.

64. 64. The electronic expansion valve according to claim 63, wherein the length of the second guide hole (801) is L82, and L81≦0.9*L82.

65. The electronic expansion valve of claim 63, wherein the diameter of the second guide hole (801) is D82, and 0≦D81−D82≦0.1 mm.

66. An electronic expansion valve as described in Claim 63, wherein a second connection hole (802) is provided in the nut sleeve (80), the screw (40) and the second connection hole (802) are threadedly engaged, the second guide hole (801) is provided at one end of the nut sleeve (80) close to the valve port (102), and the second guide hole (801) and the second connection hole (802) are connected to each other.

67. An electronic expansion valve as described in Claim 66, wherein the valve head (30) and the valve port (102) are arranged coaxially.

68. 68. The electronic expansion valve according to claim 67, wherein the screw (40) and the valve head (30) are arranged coaxially, one end of the screw (40) adjacent to the valve port (102) is connected to the valve head (30), and the screw (40) moves the valve head (30) in conjunction with the screw (40) to close or open the valve port (102).

69. 64. The electronic expansion valve of claim 63, wherein 6.5 mm≦D81≦8 mm.

70. 65. The electronic expansion valve of claim 64, wherein 3 mm≦L82≦5 mm.

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