Electronic Expansion Valve

Abstract

The present application provides an electronic expansion valve including a valve seat 10, a nut seat 20, a guide sleeve 30, and a valve core assembly 40. The valve seat 10 has a valve chamber 101 and an attachment port 102 that are connected to each other, and further has a valve port 103 that is connected to the valve chamber 101, and the valve seat 10 is provided with a first position restricting structure. The nut seat 20 has first and second ends that are opposite to each other, the first end of the nut seat 20 being located at the attachment port 102, and the first end of the nut seat 20 being provided with a second position restricting structure. The guide sleeve (30) is disposed within the valve chamber (101) and has a first end and a second end opposite each other. The outer peripheral surface of the first end of the guide sleeve (30) is restrained and engaged with a first position restricting structure, and the outer peripheral surface of the second end of the guide sleeve (30) is restrained and engaged with a second position restricting structure, thereby restricting the position of the guide sleeve (30). The valve core assembly (40) is inserted into the guide sleeve (30) and is used to adjust the flow rate at the valve orifice (103). The electronic expansion valve improves the accuracy of the flow rate adjustment at the valve orifice by the valve core assembly.

Description

[Technical Field]

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on October 31, 2022, bearing application number 202222918868.2 and entitled "Electronic Expansion Valve."

[0002] This application claims priority to a patent application filed with the State Intellectual Property Office of China on October 31, 2022, bearing application number 202222928383.1 and entitled "Electronic Expansion Valve."

[0003] TECHNICAL FIELD This application relates to the field of valves, and more particularly to electronic expansion valves. [Background technology]

[0004] The valve seat of the electronic expansion valve is provided with a valve port, the nut seat and the valve seat are connected to each other, and the guide sleeve of the electronic expansion valve is provided between the nut seat and the valve seat to guide the movement of the valve core assembly, and the valve core assembly adjusts the flow rate of the valve port. However, in the prior art, the coaxiality between the guide sleeve and the valve seat is low, and therefore the coaxiality between the valve core assembly and the valve seat is also low, resulting in low accuracy in adjusting the flow rate of the valve port by the valve core assembly. Summary of the Invention [Problem to be solved by the invention]

[0005] [Means for solving the problem]

[0006] The present application provides an electronic expansion valve to solve the problem in the prior art that the valve core assembly has low accuracy in adjusting the flow rate at the valve port.

[0007] The present application provides an electronic expansion valve, including: a valve seat having a valve chamber and an access port which are connected to each other, and further having a valve port, the valve port being connected to the valve chamber and having a first position restricting structure on the valve seat; a nut seat having first and second opposite ends, the first end of the nut seat being located at the access port and having a second position restricting structure on the first end of the nut seat; a guide sleeve located in the valve chamber, the guide sleeve having first and second opposite ends, the outer peripheral surface of the first end of the guide sleeve being restrictively engaged with the first position restricting structure and the outer peripheral surface of the second end of the guide sleeve being restrictively engaged with the second position restricting structure, thereby restricting the position of the guide sleeve; and a valve core assembly inserted into the guide sleeve and used to adjust the flow rate at the valve port.

[0008] Furthermore, a position restriction groove is provided at the bottom of the valve chamber, and the position restriction groove is located on the outer periphery of the valve port. The first end of the guide sleeve is inserted into the position restriction groove and is restrictedly engaged with the inner wall of the position restriction groove.

[0009] Furthermore, the position restricting groove has a circular cross section, and the first end of the guide sleeve is engaged with the position restricting groove in a tight fit state.

[0010] Furthermore, the depth of the position regulating groove is 1.5 mm or more.

[0011] Furthermore, the valve port is provided at the bottom of the position restriction groove and is coaxial with the position restriction groove.

[0012] Furthermore, the valve seat includes a main body portion and a protrusion portion that are integrally connected along the axial direction, and one end of the valve seat that is remote from the position restriction groove of the valve port extends to an end face of the protrusion portion.

[0013] Furthermore, a position control hole is provided at the first end of the nut seat, and a stepped surface exists within the position control hole. The second end of the guide sleeve is inserted into the position control hole and engaged with the position control hole in a tight fit state, and the end face of the second end of the guide sleeve abuts against the stepped surface.

[0014] Furthermore, a first communication hole is provided on a side wall of the valve seat, and the electronic expansion valve further includes a first communication pipe and a second communication pipe, the first communication pipe being connected to the first communication hole, and the second communication pipe being fitted onto the outer periphery of the protrusion and welded to the valve seat.

[0015] Furthermore, an avoidance groove is provided on the end face of one end connected to the protrusion of the main body, the avoidance groove is provided in a ring shape on the outer periphery of the protrusion, the diameter of the avoidance groove is larger than the outer diameter of the second communicating pipe, and the end of the second communicating pipe is located within the avoidance groove.

[0016] Furthermore, a gap is provided along the axial direction of the valve seat between the first communication hole and an inner end face of the valve seat at one end remote from the mounting opening.

[0017]

[0013] When the technical solution of the present application is applied, the first and second position restricting structures restrict the positions of the outer peripheral surfaces of the first and second ends of the guide sleeve, respectively, thereby improving the coaxiality of the guide sleeve, the nut seat, and the valve seat. Specifically, the first and second position restricting structures restrict the positions of the outer peripheral surfaces of the first and second ends of the guide sleeve, respectively. This arrangement ensures the machining accuracy of the outer peripheral surface of the guide sleeve, thereby ensuring the coaxiality of the outer peripheral surface of the guide sleeve with the valve seat and the nut seat, improving the installation accuracy between the valve seat and the guide sleeve and between the guide sleeve and the nut seat, ensuring the stability of the guide sleeve, reducing the occurrence of tilt of the guide sleeve, ensuring the coaxiality of the valve core assembly with the valve seat, and ensuring the accuracy of the valve opening / closing process and the flow rate adjustment process.

[0018] The drawings in the specification that form a part of this application are intended to provide further understanding of the application, and the schematic examples and their descriptions are intended to interpret the application and are not intended to unduly limit the application. [Brief explanation of the drawings]

[0019] [Figure 1]1 shows a schematic diagram of the structure of an electronic expansion valve provided in Example 1 of the present application. [Figure 2] 1 shows a schematic diagram of the engagement between the valve seat and the guide sleeve of the electronic expansion valve provided in Example 1 of the present application. [Figure 3] 1 shows a schematic diagram of the structure of a valve seat of an electronic expansion valve provided in Example 1 of the present application. [Figure 4] 1 shows a schematic diagram of the configuration of an electronic expansion valve provided in Example 2 of the present application. [Figure 5] 1 shows a schematic diagram of a part of the configuration of an electronic expansion valve provided by Example 2 of the present application. [Figure 6] 1 shows a schematic diagram of the configuration of a guide piece provided by Example 2 of the present application. [Figure 7] FIG. 10 shows a schematic diagram of the configuration of another guide piece provided by Example 2 of the present application. [Figure 8] 1 shows a schematic diagram of a part of the configuration of an electronic expansion valve provided by Example 2 of the present application. [Figure 9] FIG. 10 shows a schematic diagram of the inter-engagement configuration of the nut seat, the spiral guide rail and the locking ring provided by Example 2 of the present application. [Figure 10] 1 shows a schematic diagram of the structure of a locking ring provided by Example 2 of the present application. [Figure 11] FIG. 10 shows a front view of a locking ring provided by Example 2 of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0020] The technical solutions in the embodiments of the present application will be described below clearly and completely in conjunction with 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 not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and does not constitute any limitation on the present application and its application or use. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0021] As shown in FIGS. 1 to 3 , a first embodiment of the present application provides an electronic expansion valve including a valve seat 10, a nut seat 20, a guide sleeve 30, and a valve core assembly 40. The valve seat 10 has a valve chamber 101 and an attachment port 102 that are connected to each other, and further has a valve port 103 that is connected to the valve chamber 101. The valve seat 10 is provided with a first position restricting structure. The nut seat 20 has a first end and a second end that are opposite to each other, the first end of the nut seat 20 is provided at the attachment port 102, and the first end of the nut seat 20 is provided with a second position restricting structure. The guide sleeve 30 is provided in the valve chamber 101, and has a first end and a second end that are opposite to each other, with the outer circumferential surface of the first end of the guide sleeve 30 engaging with the first position restricting structure and the outer circumferential surface of the second end of the guide sleeve 30 engaging with the second position restricting structure, thereby restricting the position of the guide sleeve 30. The valve core assembly 40 is inserted into the guide sleeve 30 and is used to adjust the flow rate at the valve port 103 .

[0022] When the technical solution of the present application is applied, the first and second position restricting structures restrict the position of the outer peripheral surface of the first end of the guide sleeve 30 and the outer peripheral surface of the second end of the guide sleeve 30, respectively, thereby improving the coaxiality of the guide sleeve 30, the nut seat 20, and the valve seat 10. Specifically, the first and second position restricting structures restrict the position of the outer peripheral surface of the first end of the guide sleeve 30 and the outer peripheral surface of the second end of the guide sleeve 30, respectively. This arrangement ensures the machining accuracy of the outer peripheral surface of the guide sleeve 30, thereby ensuring the coaxiality of the outer peripheral surface of the guide sleeve 30 with the valve seat 10 and the nut seat 20, improving the installation accuracy between the valve seat 10 and the guide sleeve 30 and between the guide sleeve 30 and the nut seat 20, ensuring the stability of the guide sleeve 30, reducing the occurrence of tilt of the guide sleeve 30, and ensuring the coaxiality of the valve core assembly 40 and the valve seat 10, thereby ensuring the accuracy of the valve opening / closing process and the flow rate adjustment process. In the conventional technical solution, the inner peripheral surface of the first end of the guide sleeve 30 is constrained to engage with the valve seat 10, and the outer peripheral surface of the guide sleeve 30 is constrained to engage with the nut seat 20. This type of installation makes it difficult to ensure the coaxiality between the inner and outer peripheral surfaces of the guide sleeve 30, making it difficult to ensure the coaxiality between the guide sleeve 30 and the nut seat 20, and between the guide sleeve 30 and the valve seat 10. This affects the coaxiality between the valve core assembly 40 and the valve seat 10, and affects the accuracy of the flow rate regulation of the valve orifice 103 by the valve core assembly 40. Furthermore, compared with the conventional technology, the installation of this solution relaxes the requirement for the coaxiality between the outer and inner peripheral surfaces of the guide sleeve 30, and further reduces the processing costs of the guide sleeve 30 to a certain extent.

[0023] In this solution, the nut seat 20 includes a nut body 23 and a connection plate 24. The connection plate 24 and the nut body 23 are provided separately, and the connection plate 24 is fitted in a ring shape onto the outer periphery of the first end of the nut body 23. The connection plate 24 and the nut body 23 are engaged with each other in an axially restricted manner, in a circumferentially tight-fitted manner, and in a radially loose-fitted manner. The first ends of the connection plate 24 and the nut body 23 are both inserted into the mounting port 102, and the connection plate 24 is welded to the valve seat 10.

[0024] With the above-mentioned installation, the connecting plate 24 can move radially around the nut body 23 but cannot rotate circumferentially around the nut body 23. This avoids the situation in the prior art where the connecting plate 24 tightly engages with the valve seat 10 and the nut body 23, respectively, resulting in excessive radial positioning of the nut body 23 during the process of assembling the nut seat 20 to the valve seat 10. This reduces the difficulty of assembling the nut seat 20 and improves the concentricity between the nut seat 20 and the valve seat 10.

[0025] Specifically, a boss structure is provided on the outer wall of the first end of the nut body 23, and the connection plate 24 is located on the end face side of the boss structure away from the first end of the nut body 23, and the connection plate 24 abuts and engages with the boss structure.

[0026] A position control boss is provided on the outer wall of the first end of the nut body 23, and a position control groove is provided on the inner wall of the connecting plate 24, with the position control boss and the position control groove engaging in a tight fit in the circumferential direction, and the position control boss and the position control groove engaging in a loose fit in the radial direction.

[0027] Specifically, a first position restriction groove 104 is provided at the bottom of the valve chamber 101, and is located on the outer periphery of the valve port 103. The first position restriction groove 104 and the valve port 103 are coaxial. The first end of the guide sleeve 30 is inserted into the first position restriction groove 104 and is engaged with the inner wall of the first position restriction groove 104. The provision of the first position restriction groove 104 simplifies the structure and facilitates the processing and molding of the valve seat 10. A plurality of communication holes 301 are provided in the side wall of the guide sleeve 30, and the inside and outside of the guide sleeve 30 are connected to each other through the communication holes 301. This solution does not limit the number of communication holes 301. In this embodiment, four communication holes 301 are provided in a ring shape at intervals around the circumferential direction of the guide sleeve.

[0028] Specifically, the cross section of the first position restriction groove 104 is circular, and the first end of the guide sleeve 30 is engaged in the first position restriction groove 104 in an interference-fit manner. Making the cross section of the first position restriction groove 104 circular facilitates the processing and molding of the valve seat 10. Also, engaging the first end of the guide sleeve 30 in an interference-fit manner with the first position restriction groove 104 ensures convenience and stability in attaching the first end of the guide sleeve 30 to the valve seat 10. Here, the diameter of the outer circumferential surface of the guide sleeve 30 can be made uniform along the axial direction of the guide sleeve 30.

[0029] Furthermore, the depth of the first position restriction groove 104 is 1.5 mm or more. If the depth of the first position restriction groove 104 is less than 1.5 mm, the guide sleeve 30 may tilt, which may affect the concentricity between the guide sleeve 30 and the valve seat 10. Furthermore, if the depth of the first position restriction groove 104 is less than 1.5 mm, the stability of the connection between the guide sleeve 30 and the valve seat 10 will be reduced. In this solution, the depth of the first position restriction groove 104 is 1.5 mm or more, which not only ensures the concentricity between the guide sleeve 30 and the valve seat 10, but also ensures the stability of the connection between the guide sleeve 30 and the valve seat 10.

[0030] The depth of the first position restriction groove 104 can be 1.5 mm, 1.7 mm, or 1.9 mm, but in this embodiment, the depth of the first position restriction groove 104 is 1.5 mm.

[0031] Furthermore, the valve port 103 is located at the bottom of the first position restriction groove 104 and is coaxial with the first position restriction groove 104. This arrangement ensures the precision of engagement between the valve core assembly 40 and the valve port 103, and further ensures the precision of the flow rate regulation at the valve port 103 by the valve core assembly 40.

[0032] 1 and 2, the valve seat 10 includes a main body 11 and a protrusion 12 that are integrally connected along the axial direction, and one end thereof remote from the first position restriction groove 104 of the valve port 103 extends to the end face of the protrusion 12. The valve seat 10 may be integrally formed by cold heading, or may be formed by precision lathe machining.

[0033] In this solution, the valve orifice 103 includes a cylindrical hole and a conical hole that are sequentially connected along the axial direction of the valve seat 10, with one end of the cylindrical hole remote from the conical hole communicating with the first position restriction groove 104, and one end of the conical hole connected to the cylindrical hole being located in the main body 11, with the diameter of the conical hole gradually increasing in the direction away from the cylindrical hole, and the one end of the conical hole remote from the cylindrical hole extending to the end face of the protrusion 12. This arrangement ensures ease of processing the valve orifice 103 and ensures accurate flow rate regulation at the valve core assembly 40 and the valve orifice 103.

[0034] As shown in Figure 1, a position control hole 201 is provided at the first end of the nut seat 20, and a step surface is present within the position control hole 201. The second end of the guide sleeve 30 is inserted into the position control hole 201 and engages with the position control hole 201 in a tight fit, with the end face of the second end of the guide sleeve 30 abutting against the step surface.

[0035] In this solution, the position restriction hole includes a first hole portion and a second hole portion that are sequentially connected along the axial direction of the nut seat 20, the first hole portion is provided close to the valve port 103, the diameter of the first hole portion is larger than the diameter of the second hole portion, a stepped surface is formed between the first hole portion and the second hole portion, and the second end of the guide sleeve 30 is inserted into the first hole portion and engaged with the first hole portion in a tight fit. The installation of the position restriction hole 201 has a simple structure and ensures convenience in attaching the nut seat 20 and the guide sleeve 30.

[0036] Specifically, when assembling the electronic expansion valve, first, the first end of the guide sleeve 30 is inserted into the first position restricting groove 104, and then the first end of the nut seat 20 is fitted onto the second end of the guide sleeve 30 so that the first and second ends of the guide sleeve 30 are connected to the valve seat 10 and the nut seat 20, respectively.

[0037] 1 and 3, a first communication hole 105 is provided on the side wall of the valve seat 10, and the electronic expansion valve further includes a first communication pipe 01 and a second communication pipe 02, where the first communication pipe 01 is connected to the first communication hole 105 and the second communication pipe 02 is fitted onto the outer periphery of the protrusion 12 and welded to the valve seat 10. In this embodiment, the first communication pipe 01 is inserted into the first communication hole 105 and welded to the valve seat 10. The second communication pipe 02 is fitted onto the outer periphery of the protrusion 12, and this arrangement ensures convenient connection and tight sealing between the second communication pipe 02 and the valve seat 10.

[0038] Furthermore, an avoidance groove 111 is provided on the end face of one end of the main body 11 connected to the protrusion 12, and the avoidance groove 111 is provided in a ring shape on the outer periphery of the protrusion 12, with the diameter of the avoidance groove 111 being larger than the outer diameter of the second communicating pipe 02, and the end of the second communicating pipe 02 being located within the avoidance groove 111. The avoidance groove 111 is provided coaxially with the protrusion 12, and the interior of the avoidance groove 111 is used to install a weld ring, which is provided in a ring shape on the outer periphery of the protrusion 12 and engaged with the avoidance groove 111 in a press-fit state. Installing the weld ring in this manner positions it, ensuring the stability of the weld ring and ensuring the welding effect of the second communicating pipe 02.

[0039] Furthermore, a gap is provided along the axial direction of the valve seat 10 between the first communication hole 105 and the inner end face of the valve seat 10 at one end remote from the mounting opening 102. This arrangement makes it easy to process the first communication hole 105 and also makes it easy to mount the first communication pipe 01.

[0040] Example 2 of the present application provides an electronic expansion valve including a valve seat 10, a casing 100, a nut seat 20, a guide sleeve 30, a valve core assembly 40, a screw rod 50, a guide piece 60, a spiral guide rail 70, a locking ring 80, and a rotor assembly 90. The valve seat 10 has an attachment port 102, a valve chamber 101, and a valve port 103, which are sequentially connected along the axial direction. The valve port 103 is located at one end of the valve seat 10. The valve core assembly 40 is movably mounted within the valve chamber 101 and is used to adjust the flow rate at the valve port 103. The guide sleeve 30 is mounted within the valve chamber 101, with one end of the guide sleeve 30 engaging with the valve seat 10. The valve core assembly 40 is movably inserted within the guide sleeve 30 and guide-engaged with the guide sleeve 30. The rotor assembly 90 is rotatably mounted within the casing 100. The nut seat 20 has a first end and a second end arranged opposite to each other, the outer diameter of the second end is smaller than the outer diameter of the first end, the first end includes a conical segment and a cylindrical segment connected to each other, the conical segment is arranged close to the second end, the outer diameter of the conical segment gradually increases in the direction from the second end to the first end, the first end is arranged at the mounting port 102 of the valve seat 10, the other end of the guide sleeve 30 is inserted into the first end of the nut seat 20 and is restrictedly engaged with the nut seat 20, and the second end of the nut seat 20 is inserted into the rotor assembly 90. The screw rod 50 is inserted into the nut seat 20 and screwed into the nut seat 20. The screw rod 50 has a third end and a fourth end opposite each other. The third end of the screw rod 50 is connected to the rotor assembly 90. The fourth end of the screw rod 50 is inserted into the guide sleeve 30 and is drivingly connected to the valve core assembly 40, so that the valve core assembly 40 adjusts the flow rate at the valve port 103.The guide piece 60 has a connecting segment 61 and an extending segment 62 connected to each other. The connecting segment 61 is used for connecting with the rotor assembly 90 and / or the screw rod 50. The extending segment 62 is located outside the nut seat 20. The extending segment 62 has opposite connecting and free ends. The free end faces the nut seat 20 and is connected to the connecting segment 61. The distance between the connecting end and the axis of the screw rod 50 is smaller than the distance between the free end and the axis of the screw rod 50. The spiral guide rail 70 is ring-shaped and arranged on the outer periphery of the nut seat 20. The locking ring 80 is slidably arranged within the spiral guide rail 70. The locking ring 80 has first and second limit positions oppositely arranged along the axial direction of the nut seat 20. The guide piece 60 is drivingly connected to the locking ring 80 so that the locking ring 80 can move between the first and second limit positions. The valve seat 10, the nut seat 20, the guide sleeve 30, the valve port 103, the valve core assembly 40, the rotor assembly 90, the screw rod 50, the spiral guide rail 70 and the locking ring 80 are all arranged coaxially.

[0041] The technical solution of the present application reduces the centrifugal force of the guide piece 60 during rotation, ensuring the smoothness of the guide piece 60 during rotation and ensuring the smooth operation of the electronic expansion valve. Specifically, the distance between the free end of the extension segment 62 and the nut seat 20 is greater than the distance between the connecting end and the nut seat 20. This arrangement prevents the free end from avoiding the nut seat 20 during rotation and movement, i.e., preventing mutual interference between the guide piece 60 and the nut seat 20. The distance between the connecting end and the screw rod 50 is smaller than that of the free end. This arrangement relatively reduces the centrifugal force of the connecting end, reducing the centrifugal force of the guide piece 60 during rotation, reducing rattle of the guide piece 60 during rotation, reducing rattle during the operation of the rotor assembly, ensuring the smooth operation of the screw rod 50, ensuring the accuracy of the flow rate regulation at the valve port 103 by the valve core assembly 40, and ensuring the smooth operation of the electronic expansion valve.

[0042] In this solution, the nut seat 20 includes a nut body 23 and a connection plate 24. The connection plate 24 and the nut body 23 are provided separately, and the connection plate 24 is fitted in a ring shape onto the outer periphery of the first end of the nut body 23. The connection plate 24 and the nut body 23 are engaged with each other in an axially restricted manner, in a circumferentially tight-fitted manner, and in a radially loose-fitted manner. The first ends of the connection plate 24 and the nut body 23 are both inserted into the mounting port 102, and the connection plate 24 is welded to the valve seat 10.

[0043] With the above-mentioned installation, the connecting plate 24 can move radially around the nut body 23 but cannot rotate circumferentially around the nut body 23. This avoids the situation in the prior art where the connecting plate 24 tightly engages with the valve seat 10 and the nut body 23, respectively, during the process of assembling the nut seat 20 to the valve seat 10, resulting in the nut body 23 being over-positioned radially. This reduces the difficulty of assembling the nut seat 20 and improves the concentricity between the nut seat 20 and the valve seat 10.

[0044] Specifically, a boss structure is provided on the outer wall of the first end of the nut body 23, and the connection plate 24 is located on the end face side of the boss structure away from the first end of the nut body 23, and the connection plate 24 abuts and engages with the boss structure.

[0045] A position control boss is provided on the outer wall of the first end of the nut body 23, and a position control groove is provided on the inner wall of the connecting plate 24, with the position control boss and the position control groove engaged in a tight fit in the circumferential direction, and the position control boss and the position control groove engaged in a loose fit in the radial direction.

[0046] 4 to 7, the extension segment 62 includes a first segment 621, a bending structure portion 622, and a second segment 623, which are connected in sequence, with the first segment 621 connected to the connection segment 61 and one end of the second segment 623 remote from the first segment 621 forming a free end. By providing the bending structure portion 622, the distance between the first segment 621 and the screw rod 50 is made different from the distance between the second segment 623 and the screw rod 50. In this embodiment, the guide piece 60 has an integrally molded structure, and by installing it in this manner, the structural stability of the guide piece 60 can be ensured.

[0047] In this embodiment, the extending direction of the first segment 621 is the same as the axial direction of the screw rod 50, and the extending direction of the second segment 623 is the same as the axial direction of the screw rod 50. This arrangement ensures that the first segment 621 and the second segment 623 are parallel to each other, and further ensures that the guide piece 60 operates smoothly.

[0048] This solution does not limit the specific form of the bending structure 622. In this embodiment, the bending structure 622 includes a transition segment, which may be an inclined transition segment. An included angle exists between the extension direction of the inclined transition segment and the axial direction of the screw rod 50. The distance between the inclined transition segment and the axis of the rotor assembly 90 gradually increases from the second end to the first end of the nut seat 20. This arrangement ensures convenience in the processing of the extension segment 62 and the stability of the connection between the inclined transition segment and the first segment 621 and the second segment 623. The transition segment may also be a horizontal transition segment. When the transition segment is a horizontal transition segment, the extension direction of the horizontal transition segment is the same as the radial direction of the screw rod 50. The bending structure 622 may include a plurality of inclined and horizontal transition segments connected to each other, and may also have a stepped structure.

[0049] Furthermore, along the axial direction of the screw rod 50, the length of the bending structure 622 is shorter than the length of the first segment 621, and the length of the bending structure 622 is shorter than the length of the second segment 623. In this embodiment, the specific lengths of the first segment 621 and the second segment 623 are not limited as long as it is possible to ensure that the second segment 623 can avoid contact with the nut seat 20 during the operation of the guide piece 60. In this embodiment, the specific position of the bending structure 622 is not limited, and the bending structure 622 may be located near the connecting end or the free end.

[0050] Specifically, the rotor assembly 90 includes a rotor body 91 and a connecting member 92, the rotor body 91 being ring-shaped and disposed around the nut seat 20, the connecting member 92 being disposed on the rotor body 91 and located at one end of the nut seat 20 remote from the valve port 103, the connecting member 92 being provided with a first insertion hole 921, the connecting segment 61 of the guide piece 60 being located at one end of the connecting member 92 remote from the nut seat 20 and connected to the connecting member 92 and / or the screw rod 50, the connecting end of the extension segment 62 passing through the first insertion hole 921 to be connected to the connecting segment 61. In this embodiment, the cross section of the first insertion hole 921 is quadrilateral, and the cross section of the connecting end matches the cross section of the first insertion hole 921, and the connecting end is inserted into the first insertion hole 921, which further restricts the relative positions of the guide piece 60 and the rotor assembly 90 in the circumferential direction and further ensures the stability of the connection between the guide piece 60 and the rotor assembly 90. At the same time, the above-described installation positions the bending structure 622 on the side of the connecting member 92 that is closest to the nut seat 20, ensuring overall compactness in the axial direction.

[0051] As shown in Figures 5 and 8, the present solution does not limit the specific connection manner of the guide piece 60, the connecting member 92, and the screw rod 50, as long as they can move synchronously. In this embodiment, the connecting member 92 includes a connecting plate and a protruding post connected to each other along the axial direction. The protruding post is located on one side of the connecting plate, away from the nut seat 20, and a first insertion hole 921 is provided in the connecting plate. A second position restricting groove 922 is provided on one side of the protruding post, away from the connecting plate. At least a portion of the connecting segments 61 is disposed in the second position restricting groove 922 to restrict the relative position of the connecting segments 61 and the connecting member 92 in the circumferential direction. A second insertion hole 923 is provided on an end face of the connecting member 92, close to the nut seat 20, and the second insertion hole 923 is connected to the second position restricting groove 922. The third end of the screw rod 50 passes through the second insertion hole 923 and is connected to the connecting segment 61, and the third end of the screw rod 50 is connected to the connecting member 92.

[0052] In this embodiment, the second position regulating groove 922 includes a first position regulating groove and a second position regulating groove that are connected in a stepped manner along the radial direction, the width of the first position regulating groove is smaller than the width of the second position regulating groove, one end of the first position regulating groove away from the second position regulating groove extends to the peripheral surface of the protruding post, the cross sections of the first position regulating groove and the second position regulating groove are both rectangular, the center line of the second position regulating groove overlaps with the axis of the connecting member 92, and the shape of the connecting segment 61 of the guide piece 60 is compatible with the cross-sectional shape of the second position regulating groove 922. The connecting segment 61 is provided with a third insertion hole 611, which is coaxial with the second insertion hole 923. The third end of the screw rod 50 passes through the third insertion hole 611 and protrudes from the connecting segment 61. The screw rod 50 is welded to the connecting segment 61. The screw rod 50 has a stepped surface that is in restrictive engagement with one end face of the connecting member 92 that is adjacent to the nut seat 20. The above-mentioned installation ensures a stable and convenient connection between the guide piece 60, the connecting member 92, and the screw rod 50.

[0053] 4 and 9 to 11, the locking ring 80 has a first engagement portion 81 and a second engagement portion 82, which are spaced apart along the axial direction of the locking ring 80, and both the first engagement portion 81 and the second engagement portion 82 extend along the radial direction of the locking ring 80, and both the first engagement portion 81 and the second engagement portion 82 can abut and engage with the guide piece 60. In this embodiment, the specific form of the spiral guide rail 70 is not limited, and the spiral guide rail 70 may be configured so that a coil spring is fitted onto the outer periphery of the nut seat 20, or the spiral guide rail 70 may be configured so that it is integrally molded with the nut seat 20.

[0054] In this embodiment, the spiral guide rail 70 is integrally molded with the nut seat 20. In this solution, the locking ring 80 includes a spiral body, which is fitted to the spiral guide rail 70. In this solution, the connection between the first engagement portion 81 and the spiral body and the connection between the second engagement portion 82 and the spiral body are not limited. In this embodiment, the two free ends of the spiral body are bent outward in the radial direction to form the first engagement portion 81 and the second engagement portion 82, respectively. This arrangement improves the ease of processing the locking ring 80 and ensures the structural stability of the locking ring 80.

[0055] In this solution, the extending direction of the first engaging portion 81 and the extending direction of the second engaging portion 82 are not limited. The center line of the first engaging portion 81 and the center line of the second engaging portion 82 may be positioned on the same plane as the axis of the locking ring 80, and the first engaging portion 81 and the second engaging portion 82 may both be positioned on the same side of the guide piece 60. The guide piece 60 pushes and moves the locking ring 80 via the first engaging portion 81 and the second engaging portion 82. This arrangement ensures that the guide piece 60 simultaneously contacts the first engaging portion 81 and the second engaging portion 82 during movement, ensuring uniformity of the force received by the locking ring 80, ensuring smooth movement of the locking ring 80, and reducing wear between the locking ring 80 and the spiral guide rail 70.

[0056] Alternatively, the first engaging portion 81 and the second engaging portion 82 may be offset in the axial direction of the locking ring 80, with the guide piece 60 positioned between the first engaging portion 81 and the second engaging portion 82. That is, an included angle exists between the projections of the center lines of the first engaging portion 81 and the second engaging portion 82 onto a plane perpendicular to the axis of the locking ring 80. When installed in this manner, the guide piece 60 follows the shortest possible rotation path during reverse rotation, ensuring the reversal speed of the electronic expansion valve.

[0057] The electronic expansion valve further includes a first locking portion 21 and a second locking portion 22, both of which are provided on the outer circumferential surface of the nut seat 20 and are arranged along the axial direction of the nut seat 20, with the locking ring 80 located between the first locking portion 21 and the second locking portion 22, the first locking portion 21 being engaged with the first engaging portion 81, and the second locking portion 22 being engaged with the second engaging portion 82. In this embodiment, the first locking portion 21 and the second locking portion 22 are respectively a first locking protrusion and a second locking protrusion, which are integrally formed with the nut seat 20 and are located at both ends of the spiral guide rail 70. By installing in this manner, the stability of the connection between the nut seat 20, the first locking portion 21 and the second locking portion 22 can be ensured.

[0058] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, the singular also includes the plural unless the context clearly dictates otherwise. Furthermore, when the terms "comprise" and / or "comprises" are used herein, it should also be understood that features, steps, operations, devices, assemblies, and / or combinations thereof are present.

[0059] Unless otherwise specifically stated, the relative arrangements of components and steps, formulas, and numerical values ​​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 may not be discussed in detail, where appropriate, the described techniques, methods, and equipment should be considered part of the permitted specification. 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.

[0060] In describing the present application, it should be understood that directions or positional relationships expressed by directional words such as "front, back, up, down, left, right," "lateral, longitudinal, vertical, horizontal," and "top, bottom" are generally based on the directions or positional relationships shown in the drawings, but are merely for the purpose of facilitating and simplifying the description of the present application, and unless otherwise stated, these directional words do not necessarily indicate or imply that the devices or elements shown have a particular orientation or are constructed or operated in a particular orientation, and therefore should not be understood as limiting the scope of protection of the present application, and the directional words "inside, outside" refer to the inside and outside of the contours of each member itself.

[0061] For convenience of description, spatially relative terms such as "above," "upper," "on top of," "above," etc. may be used herein to describe the spatial location of one device or feature relative to another device or feature, as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations during use or operation other than the orientation depicted in the figures of the device. For example, if a device in the figures were turned upside down, a device described as "above other devices or structures" or "on top of other devices or structures" would then be positioned "below other devices or structures" or "below other devices or structures." Thus, the exemplary term "above" can encompass both the orientations "above" and "below." The device can also be positioned in other different ways (rotated 90 degrees or oriented in other ways) and a corresponding interpretation given to the spatially relative descriptions used herein.

[0062] Furthermore, it should be explained that the use of terms such as "first" and "second" to define parts is merely for distinguishing corresponding parts, and unless otherwise specified, the terms do not have any special meaning, and therefore should not be understood as limiting the scope of protection of the present application.

[0063] 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 shall be included in the protection scope of the present application. [Explanation of symbols]

[0064] 10 Valve seat 101 Valve chamber 102 Mounting port 103 Valve Orifice 104 First position regulation groove 105 1st communication hole 11 Main body 111 Avoidance Groove 12 Protrusion 20 Nut seat 201 Position regulation hole 21 First locking portion 22 Second locking portion 23 Nut body 24 Connecting plate 30 Guide sleeve 301 Flow hole 40 Valve core assembly 50 screw rod 60 Guide piece 61 connection segments 611 Third insertion hole 62 Extension Segments 621 First Segment 622 Bent structure 623 Second Segment 70 Spiral guide rail 80 Locking ring 81 first engagement portion 82 second engagement portion 90 rotor assembly 91 Rotor body 92 Connecting member 921 First insertion hole 922 Second position control groove 923 Second insertion hole 01 1st communication pipe 02 2nd communication pipe 100 casing

Claims

1. A valve seat (10) having a valve chamber (101) and an attachment port (102) that are connected to each other, the valve seat (10) further having a valve port (103), the valve port (103) being connected to the valve chamber (101), and the valve seat (10) being provided with a first position restriction structure; a nut seat (20) having a first end and a second end provided opposite to each other, the first end of the nut seat (20) being provided at the mounting opening (102), and a second position restriction structure being provided at the first end of the nut seat (20); a guide sleeve (30) provided in the valve chamber (101), the guide sleeve having a first end and a second end provided opposite to each other, the outer peripheral surface of the first end of the guide sleeve (30) being restrained and engaged with the first position restraining structure portion, and the outer peripheral surface of the second end of the guide sleeve (30) being restrained and engaged with the second position restraining structure portion, thereby restraining the position of the guide sleeve (30); and a valve core assembly (40) inserted into the guide sleeve (30) and used to adjust the flow rate at the valve port (103).

2. 2. The electronic expansion valve according to claim 1, wherein a first position limiting groove (104) is provided at the bottom of the valve chamber (101), the first position limiting groove (104) is located on the outer periphery of the valve port (103), and the first end of the guide sleeve (30) is inserted into the first position limiting groove (104) and is restrained and engaged with the inner wall of the first position limiting groove (104).

3. 3. The electronic expansion valve according to claim 2, wherein the first position limiting groove (104) has a circular cross section, and the first end of the guide sleeve (30) is engaged with the first position limiting groove (104) in a press-fit state.

4. 3. The electronic expansion valve according to claim 2, wherein the depth of the first position restriction groove (104) is 1.5 mm or more.

5. 4. The electronic expansion valve according to claim 3, wherein the valve port (103) is located at the bottom of the first position limiting groove (104) and is coaxial with the first position limiting groove (104).

6. 6. The electronic expansion valve according to claim 5, wherein the valve seat (10) includes a main body (11) and a protrusion (12) that are integrally connected along the axial direction, and one end of the valve port (103) remote from the first position restriction groove (104) extends to an end face of the protrusion (12).

7. 2. The electronic expansion valve according to claim 1, wherein a position restriction hole (201) is provided at a first end of the nut seat (20), a stepped surface is present within the position restriction hole (201), the second end of the guide sleeve (30) is inserted into the position restriction hole (201) and engaged with the position restriction hole (201) in a press-fit state, and an end face of the second end of the guide sleeve (30) abuts against the stepped surface.

8. 7. The electronic expansion valve according to claim 6, wherein a first communication hole (105) is provided on a side wall of the valve seat (10), and the electronic expansion valve further includes a first communication pipe (01) and a second communication pipe (02), the first communication pipe (01) being in communication with the first communication hole (105), and the second communication pipe (02) being fitted onto an outer periphery of the protrusion (12) and welded to the valve seat (10).

9. 9. The electronic expansion valve according to claim 8, wherein an avoidance groove (111) is provided on an end face of one end of the body portion (11) connected to the protrusion (12), the avoidance groove (111) is provided in a ring shape on the outer periphery of the protrusion (12), the diameter of the avoidance groove (111) is larger than the outer diameter of the second communicating pipe (02), and the end of the second communicating pipe (02) is located within the avoidance groove (111).

10. 9. The electronic expansion valve according to claim 8, wherein a gap is provided along the axial direction of the valve seat between the first communication hole and an inner end surface of the valve seat at one end remote from the mounting port.

11. a casing (100) whose open end is fixedly connected to one end of the valve seat (10) remote from the valve port (103), and which is in communication with the valve seat (10) to form a valve body together with the valve seat (10); a rotor assembly (90) rotatably provided within the casing (100), wherein the diameter of a second end of the nut seat (20) is smaller than the diameter of a first end of the nut seat (20), and the second end of the nut seat (20) is inserted into the rotor assembly (90); a screw rod (50) inserted into the nut seat (20) and threadedly engaged with the nut seat (20), the screw rod (50) having a third end and a fourth end opposite to each other, the third end of the screw rod (50) being connected to the rotor assembly (90), and the fourth end of the screw rod (50) being drivingly connected to the valve core assembly (40) so that the valve core assembly (40) adjusts the flow rate at the valve port (103); a guide piece (60) having a connecting segment (61) and an extending segment (62) connected to each other, the connecting segment (61) being used for connecting with the rotor assembly (90) and / or the screw rod (50), the extending segment (62) being located outside the nut seat (20), the extending segment (62) having a connecting end and a free end oppositely provided, the free end being provided facing the nut seat (20), the connecting end being connected with the connecting segment (61), and the distance between the connecting end and the axis of the screw rod (50) being smaller than the distance between the free end and the axis of the screw rod (50); a spiral guide rail (70) provided in a ring shape on the outer periphery of the nut seat (20); 2. The electronic expansion valve according to claim 1, further comprising: a locking ring (80) slidably mounted within the spiral guide rail (70), the locking ring (80) having a first limit position and a second limit position oppositely disposed along the axial direction of the nut seat (20), the guide piece (60) being drivingly connected to the locking ring (80) so that the locking ring (80) moves between the first limit position and the second limit position.

12. 12. The electronic expansion valve according to claim 11, wherein the extension segment (62) includes a first segment (621), a bent structure portion (622), and a second segment (623) connected in series, the first segment (621) being connected to the connecting segment (61), and one end of the second segment (623) remote from the first segment (621) forming the free end.

13. 13. The electronic expansion valve according to claim 12, wherein the extending direction of the first segment (621) is the same as the axial direction of the screw rod (50), and the extending direction of the second segment (623) is the same as the axial direction of the screw rod (50).

14. 13. The electronic expansion valve of claim 12, wherein the bent structure portion (622) includes a transition segment, an included angle exists between an extension direction of the transition segment and an axial direction of the screw rod (50), and a distance between the transition segment and an axis of the rotor assembly (90) gradually increases along a direction from the second end toward the first end of the nut seat (20).

15. The rotor assembly (90) includes a rotor body (91) and a connecting member (92), the rotor body (91) being provided in a ring shape on the outer periphery of the nut seat (20), and the connecting member (92) being provided on the rotor body (91) and located at one end of the nut seat (20) away from the valve port (103); 12. The electronic expansion valve according to claim 11, wherein the connecting member (92) is provided with a first insertion hole (921), the connecting segment (61) of the guide piece (60) is located at one end of the connecting member (92) away from the nut seat (20) and is connected to the connecting member (92) and / or the screw rod (50), and the connecting end of the extension segment (62) passes through the first insertion hole (921) and is connected to the connecting segment (61).

16. 16. The electronic expansion valve of claim 15, wherein the connecting member has a second position restricting groove on one side thereof away from the nut seat, at least a portion of the connecting segment is positioned in the second position restricting groove to restrict the relative position of the connecting segment and the connecting member in the circumferential direction, the connecting member has a second insertion hole on one end face thereof close to the nut seat, the second insertion hole being connected to the second position restricting groove, and a third end of the screw rod passes through the second insertion hole and is connected to the connecting segment, and the third end of the screw rod is connected to the connecting member.

17. 12. The electronic expansion valve according to claim 11, wherein the locking ring (80) has a first engagement portion (81) and a second engagement portion (82), the first engagement portion (81) and the second engagement portion (82) are arranged at a distance along the axial direction of the locking ring (80), the first engagement portion (81) and the second engagement portion (82) both extend along the radial direction of the locking ring (80), and the first engagement portion (81) and the second engagement portion (82) are both capable of abutting and engaging with the guide piece (60).

18. 18. The electronic expansion valve according to claim 17, wherein a center line of the first engaging portion (81) and a center line of the second engaging portion (82) are located on the same plane as an axis of the locking ring (80), and the first engaging portion (81) and the second engaging portion (82) are both located on the same side of the guide piece (60).

19. 18. The electronic expansion valve according to claim 17, wherein the first engaging portion (81) and the second engaging portion (82) are provided so as to be offset in the axial direction of the locking ring (80), and the guide piece (60) is located between the first engaging portion (81) and the second engaging portion (82).

20. The electronic expansion valve is 18. The electronic expansion valve according to claim 17, further comprising a first locking portion (21) and a second locking portion (22), the first locking portion (21) and the second locking portion (22) are both provided on the outer peripheral surface of the nut seat (20), and the first locking portion (21) and the second locking portion (22) are arranged along the axial direction of the nut seat (20), the locking ring (80) is located between the first locking portion (21) and the second locking portion (22), the first locking portion (21) is lockingly engaged with the first engaging portion (81), and the second locking portion (22) is lockingly engaged with the second engaging portion (82).

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