Nut assembly and electronic expansion valve

Abstract

The nut assembly includes a nut (10) including a nut body (11) and a limiting plate (12) connected to each other, the limiting plate (12) having a radial dimension larger than that of the nut body (11), and a connecting plate (20) removably fitted to the nut body (11) and abutting against the limiting plate (12). The nut body and the connecting plate of the nut assembly are provided separately, which improves production efficiency and allows for better secondary use of the nut body, thereby improving the structural strength of the nut assembly. An electronic expansion valve including the nut assembly is further disclosed.

Description

[Technical Field]

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on March 4, 2022, bearing application number 202220483057.1 and titled "Nut assembly and electronic expansion valve." This application claims priority to a patent application filed with the State Intellectual Property Office of China on March 4, 2022, bearing application number 202220475997.6 and titled "Nut assembly and electronic expansion valve." This application claims priority to a patent application filed with the State Intellectual Property Office of China on March 4, 2022, bearing application number 202210212550.4 and titled "Electronic Expansion Valve." This application claims priority to a patent application filed with the State Intellectual Property Office of China on March 4, 2022, bearing application number 202220481995.8 and titled "Nut structure and electric valve." This application claims priority to a patent application filed with the State Intellectual Property Office of China on March 4, 2022, bearing application number 202220483043.X and titled "Nut assembly and electronic expansion valve." This application claims priority to a patent application filed with the State Intellectual Property Office of China on March 4, 2022, bearing application number 202220482293.1 and titled "Electronic Expansion Valve." This application claims priority to a patent application filed with the State Intellectual Property Office of China on March 4, 2022, bearing application number 202220476651.8 and titled "Nut structure and electric valve." This application claims priority to a patent application filed with the State Intellectual Property Office of China on March 4, 2022, bearing application number 202210213276.2 and titled "Nut assembly and electronic expansion valve."

[0002] The present application relates to the technical field of electronic expansion valves, and more particularly to nut assemblies and electronic expansion valves. [Background technology]

[0003] Currently, in the nut assembly of the conventional electronic expansion valve, the connecting plate and the nut body are generally connected by engagement, and the connecting plate must be inserted when the nut assembly is manufactured by insert injection molding, which results in low production efficiency and makes the nut body with the connecting plate non-reusable. Furthermore, due to process reasons, there are many burrs at the connection position between the nut body and the connecting plate, which affects the structural reliability and stability of the nut assembly. Summary of the Invention

[0004] The present application provides a nut assembly and an electronic expansion valve for improving the production efficiency and structural strength of the nut assembly in the prior art.

[0005] According to one aspect of the present application, in order to achieve the above object, the present application provides a nut assembly including a nut including a nut body and a limiting plate connected to each other, wherein the radial dimension of the limiting plate is larger than the radial dimension of the nut body, and a connecting plate that is removably fitted to the nut body and abuts against the limiting plate.

[0006] Furthermore, the limiting plate or the nut body has a first limiting structure, and the connecting plate has a second limiting structure, and the first limiting structure is limitingly engaged with the second limiting structure so as to limit the relative positions of the connecting plate and the nut in the circumferential direction.

[0007] Furthermore, the first limiting structure includes a limiting protrusion provided on the outer wall of the nut body, and the second limiting structure includes a limiting groove provided on the inner wall of the connecting plate, and the limiting protrusion is located in the limiting groove.

[0008] Furthermore, there are a plurality of limiting protrusions, and the plurality of limiting protrusions are provided surrounding the nut body, and there are a plurality of limiting grooves, and the plurality of limiting grooves are provided in one-to-one correspondence with the plurality of limiting protrusions.

[0009] Further, the nut body includes a nut segment, a transition segment, and a connection segment connected in order, the radial dimension of the connection segment being larger than the radial dimension of the nut segment, the nut segment having an internal thread, the connection segment being connected to a limiting plate, and the connection plate being removably fitted to the connection segment.

[0010] According to another aspect of the present application, there is provided an electronic expansion valve including a valve body assembly and the above-described nut assembly located within the valve body assembly.

[0011] The valve body assembly further includes a valve cover and a valve seat connected to each other, at least a portion of the nut body being positioned within a chamber of the valve cover, the limiting plate being positioned within a chamber of the valve seat, and the outer wall of the connecting plate being welded to the inner wall of the valve seat.

[0012] Furthermore, the valve seat has an opening, and a connecting plate is provided in the opening, and when the distance between the side of the connecting plate away from the valve seat from the chamber and the plane on which the opening is located is L, L≧0.02 mm, and when the thickness of the connecting plate is t, L<0.4t.

[0013] Furthermore, the connecting plate has a balancing hole or a balancing groove, and the chamber of the valve seat communicates with the chamber of the valve cover through the balancing hole or the balancing groove.

[0014] Furthermore, the electronic expansion valve further includes a guide sleeve and a spindle assembly, the nut has a positioning hole, a stop surface is located within the positioning hole, one end of the guide sleeve penetrates the positioning hole, and the end face of the guide sleeve abuts against the stop surface, and the spindle assembly is threaded onto the nut body and passes through the guide sleeve.

[0015] Furthermore, the inner wall of the valve seat has a positioning protrusion, the positioning protrusion has a valve port, the positioning protrusion penetrates into one end of the guide sleeve remote from the nut, and the positioning protrusion, guide sleeve, positioning hole and spindle assembly are arranged coaxially.

[0016] A technical aspect of the present application provides a nut assembly including a nut including a nut body and a limiting plate connected to each other, the limiting plate having a radial dimension greater than the radial dimension of the nut body, and a connecting plate removably fitted to the nut body and abutting the limiting plate. By using this aspect, the nut body and connecting plate of the nut assembly are provided separately, so that the connecting plate is removably fitted to the outer circumferential surface of the nut body and abuts the limiting plate. This avoids the need to insert the connecting plate when insert-injecting the nut assembly, as in the prior art. This allows the nut body and connecting plate to be processed and molded separately and then assembled, improving production efficiency and avoiding the nut body with the connecting plate becoming irreusable, thereby allowing for better reuse of the nut body. Furthermore, this avoids the problem of burrs being present at the connection position between the connecting plate and the nut body due to process reasons when insert-injecting the nut assembly, as in the prior art, which can damage the nut assembly, thereby improving the reliability and stability of the nut assembly. [Brief explanation of the drawings]

[0017] 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.

[0018] [Figure 1] 1 shows a schematic diagram of the structure of a nut assembly provided by an embodiment of the present application. [Figure 2] 2 shows a schematic diagram of the configuration of a nut and a limiting protrusion in the nut assembly of FIG. 1; [Figure 3] 2 shows a schematic diagram of the configuration of a connecting plate and a limiting groove of the nut assembly of FIG. 1; [Figure 4] 1 shows a schematic diagram of an electronic expansion valve provided by another embodiment of the present application. [Figure 5] 5 shows a cross-sectional view of the electronic expansion valve of FIG. [Figure 6] A magnified view of the selected location is shown in Figure 5. [Figure 7] 1 shows a schematic diagram of another nut assembly provided by an embodiment of the present application. [Figure 8] 1 shows a schematic diagram of another nut assembly provided by an embodiment of the present application. [Figure 9] A schematic diagram of a part of the structure in FIG. 8 is shown. [Figure 10] A schematic diagram of the rotor assembly in FIG. 4 is shown. [Figure 11] A schematic diagram of a part of the structure in FIG. 10 is shown. [Figure 12] A schematic diagram of the guide sheet in FIG. 10 is shown. [Figure 13] 1 shows a schematic diagram of another nut assembly provided by an embodiment of the present application. [Figure 14] A schematic diagram of the nut in FIG. 13 is shown. [Figure 15] 1 shows a schematic diagram of another nut assembly provided by an embodiment of the present application. [Figure 16] 15 shows another view of FIG. 14. [Figure 17] 17 shows a bottom view of FIG. 16. [Figure 18] A schematic diagram of the connection plate in FIG. 13 is shown. [Figure 19] 1 shows a schematic diagram of another nut assembly provided by an embodiment of the present application. [Figure 20] FIG. 20 shows a top view of the nut assembly of FIG. 19. [Figure 21] 21 shows an annotated schematic diagram of the included angles of the nut of FIG. 20. [Figure 22] 1 shows a schematic diagram of an electronic expansion valve provided by another embodiment of the present application. [Figure 23] 23 shows a cross-sectional view of the nut in FIG. 22. [Figure 24] A partial enlarged view 1 of FIG. 22 is shown. [Figure 25] A partially enlarged view 2 of FIG. 22 is shown. [Figure 26] A schematic diagram of the rotor assembly in FIG. 22 is shown.

[0019] Here, the above drawings include the following reference numerals: 10 Nut, 11 Nut body, 111 Nut segment, 112 Transition segment, 113 Connection segment, 114 Release plane, 115 Guide inclined surface, 12 Limiting plate, 13 Spiral guide groove, 15 Engagement groove, 151 First slot, 152 Second slot, 013 Cutting surface, 0131 First plane, 0132 Second plane, 0133 Third plane, 0134 Fourth plane, 1101 Positioning hole, 1102 Stopping surface, 030 balancing passage, 031 first groove, 032 second groove, 20 connecting plate, 21 balancing groove, 021 connecting ring, 201 burr surface, 31 limiting protrusion, 311 first limiting surface, 312 first engagement surface, 32 limiting groove, 321 second limiting surface, 322 second engagement surface, 40 valve body assembly, 41 valve cover, 42 valve seat, 421 positioning protrusion, 422 valve port, 040 valve port member, 042 body, 0421 first shaft segment, 0422 second shaft segment, 0423 third shaft segment, 4221 first step surface, 4222 second step surface, 411 first limiting block, 412 limiting ring, 4121 arc-shaped member, 4122 first hook, 4123 second hook, 4124 first stop surface, 43 second limiting block, 431 second stop surface, 50 guide sleeves, 60 spindle assembly, 70 retaining ring, 71 spiral member, 72 third hook, 73 fourth hook, 831 first limiting portion, 832 second limiting portion, 833 third limiting portion, 834 fourth limiting portion, 35 fifth limiting portion, 36 sixth limiting portion, 90 rotor assembly, 91 rotor connection plate, 92 guide sheet, 921 press-fit segment, 922 limiting segment, 93 magnetic rotor, 94 press-fit groove, 95 limiting member. DETAILED DESCRIPTION OF THE INVENTION

[0020] 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.

[0021] As shown in FIGS. 1 to 3 , an embodiment of the present application provides a nut assembly including a nut 10 including a nut body 11 and a limiting plate 12 connected to each other, where the radial dimension of the limiting plate 12 is larger than the radial dimension of the nut body 11, and a connecting plate 20 removably fitted to the nut body 11 and abutting against the limiting plate 12.

[0022] In this embodiment, the nut body 11 and connecting plate 20 of the nut assembly are provided separately, so that the connecting plate 20 is removably fitted to the outer peripheral surface of the nut body 11 and abuts against the limiting plate 12. This avoids the need to insert a connecting plate when insert-injecting the nut assembly, as in the prior art. This allows the nut body 11 and connecting plate 20 to be processed and molded separately and then assembled, improving production efficiency and preventing the nut body with the connecting plate from becoming irreusable, thereby allowing for better reuse of the nut. Furthermore, this avoids the damage to the nut assembly that occurs when insert-injecting the nut assembly, which is caused by the presence of many burrs at the connection position between the connecting plate and the nut body due to process reasons, as in the prior art, improving the reliability and stability of the nut assembly.

[0023] 2 and 3, the limiting plate 12 or the nut body 11 has a first limiting structure, and the connecting plate 20 has a second limiting structure, and the first limiting structure is limitingly engaged with the second limiting structure so as to limit the relative positions of the connecting plate 20 and the nut 10 in the circumferential direction. In this way, the limiting engagement between the first limiting structure and the second limiting structure limits the relative positions of the connecting plate 20 and the nut in the circumferential direction, preventing the connecting plate 20 and the nut from rotating relative to each other after installation is complete, ensuring the reliability of the nut assembly.

[0024] Specifically, the first limiting structure includes a limiting protrusion 31 provided on the outer wall of the nut body 11, and the second limiting structure includes a limiting groove 32 provided on the inner wall of the connecting plate 20, with the limiting protrusion 31 located within the limiting groove 32. In this way, the limiting protrusion 31 on the outer wall of the nut body 11 is inserted into the limiting groove 32 on the inner wall of the connecting plate 20 to limit the relative positions of the connecting plate 20 and the nut in the circumferential direction, thereby preventing relative rotation between the connecting plate 20 and the nut after installation is complete, ensuring the reliability of the nut assembly. At the same time, because a limiting method is used in which the limiting protrusion 31 and the limiting groove 32 engage with each other, the limiting protrusion 31 and the limiting groove 32 can be easily machined and provide a good limiting effect.

[0025] Specifically, there are a plurality of limiting protrusions 31, and the plurality of limiting protrusions 31 are provided surrounding the nut body 11, and there are a plurality of limiting grooves 32, and the plurality of limiting grooves 32 are provided in one-to-one correspondence with the plurality of limiting protrusions 31. In this way, the structural strength after the limiting engagement between the first limiting structure and the second limiting structure is improved by the limiting engagement between the plurality of sets of limiting protrusions 31 and limiting grooves 32, and at the same time, the one-to-one correspondence between the plurality of limiting grooves 32 and the plurality of limiting protrusions 31 makes it possible to more accurately identify the relative position between the connecting plate 20 and the nut body 11, thereby preventing the connecting plate 20 and the nut body 11 from being provided eccentrically.

[0026] Furthermore, the nut body 11 includes a nut segment 111, a transition segment 112, and a connection segment 113 connected in order, the radial dimension of the connection segment 113 is larger than the radial dimension of the nut segment 111, the nut segment 111 has an internal thread, the connection segment 113 is connected to the limiting plate 12, and the connection plate 20 is removably fitted to the connection segment 113.

[0027] In this embodiment, the connecting plate 20 is fitted to the connecting segment 113 and abuts against the limiting plate 12, the limiting protrusion 31 is provided on the limiting plate 12 and the connecting segment 113, and the limiting groove 32 is provided on the inner ring of the connecting plate 20. In this way, it is easy to make the nut assembly compact, and at the same time, it is easy to achieve limiting engagement between the limiting protrusion 31 and the limiting groove 32.

[0028] As shown in FIGS. 4 to 6, another embodiment of the present application provides an electronic expansion valve including a valve body assembly 40 and the above-described nut assembly located within the valve body assembly 40.

[0029] As shown in FIG. 4, the valve body assembly 40 includes a valve cover 41 and a valve seat 42 connected to each other, at least a portion of the nut body 11 is located within a chamber of the valve cover 41, the limiting plate 12 is located within a chamber of the valve seat 42, and the outer wall of the connecting plate 20 is welded to the inner wall of the valve seat 42.

[0030] In this embodiment, the nut segment 111 and the transition segment 112 of the nut body 11 are both located in the chamber of the valve cover 41, a portion of the connecting segment 113 of the nut body 11 is located in the chamber of the valve cover 41 and another portion is located in the chamber of the valve seat 42, and the limiting plate 12 is located in the chamber of the valve seat 42. The outer diameter of the connecting plate 20 is larger than the maximum outer diameter of the nut body 11, and the outer wall of the connecting plate 20 is welded to the inner wall of the valve seat 42, which prevents the nut assembly from moving within the chamber of the valve disc assembly 40 and ensures the reliability and stability of the electronic expansion valve.

[0031] 5 and 6, the valve seat 42 has an opening, and the connecting plate 20 is installed in the opening. Let L be the distance between the side of the connecting plate 20 away from the chamber of the valve seat 42 and the plane on which the opening is located, and L≧0.02 mm. Let t be the thickness of the connecting plate 20, and L<0.4t. In this way, part of the connecting plate 20 is located in the chamber of the valve seat 42 through the opening, and another part is located in the chamber of the valve cover 41. The limited ranges of L and t ensure that an annular step can be formed after the connecting plate 20 and the valve seat 42 are connected, and that a weld is formed at the annular location where the connecting plate 20 and the valve seat 42 are connected. This prevents the height of the step formed between the connecting plate 20 and the valve seat 42 from being too low, which would result in insufficient welding, and ensures the reliability of the welded connection between the connecting plate 20 and the valve seat 42.

[0032] Specifically, the connecting plate 20 has a balancing hole or groove 21 , and the chamber of the valve seat 42 is connected to the chamber of the valve lid 41 by the balancing hole or groove 21 .

[0033] In this embodiment, the opening of the valve seat 42 communicates with the chamber of the valve cover 41. However, after the nut assembly is installed, the chamber of the valve seat 42 is isolated from the chamber of the valve cover 41 by the nut assembly. Therefore, by providing a balancing hole or balancing groove 21 in the connecting plate 20, the chamber of the valve cover 41 and the chamber of the valve seat 42 communicate with each other, thereby achieving pressure balance within the valve body assembly 40 and ensuring the reliability of the electronic expansion valve.

[0034] Specifically, the electronic expansion valve further includes a guide sleeve 50 and a spindle assembly 60, the nut 10 has a positioning hole with a stop surface within the positioning hole, one end of the guide sleeve 50 penetrates the positioning hole, and the end face of the guide sleeve 50 abuts against the stop surface, and the spindle assembly 60 is threaded into the nut body 11 and passes through the guide sleeve 50.

[0035] In this embodiment, the spindle assembly 60 is movably inserted into the guide sleeve 50, the screw of the spindle assembly 60 is threaded into the female thread of the nut body 11, the nut has a positioning hole extending through the entire nut, a stop surface is located within the positioning hole, one end of the guide sleeve 50 abuts against the stop surface, and the outer wall of the guide sleeve 50 is restrictively engaged with the inner wall of the positioning hole. In this way, the stop surface engages with the guide sleeve 50 to position the nut, and the guide sleeve 50 provides positioning and axial restriction for the entire nut assembly, which better ensures the concentricity of the valve seat 42 and the nut assembly and improves the internal leakage prevention performance of the electronic expansion valve.

[0036] Furthermore, the inner wall of the valve seat 42 has a positioning protrusion 421, which has a valve port 422, and the positioning protrusion 421 penetrates into one end of the guide sleeve 50 remote from the nut 10, and the positioning protrusion 421, guide sleeve 50, positioning hole and spindle assembly 60 are arranged coaxially. In this way, the concentricity of the valve cover 41 and the valve seat 42 can be ensured, thereby ensuring the reliability of the electronic expansion valve.

[0037] Alternatively, the positioning projection 421 and the valve seat 42 may be an integral structure, or the positioning projection 421 and the valve seat 42 may be separate structures.

[0038] Specifically, the electronic expansion valve further includes a rotor assembly, which is disposed in the chamber of the valve cover 41, connected to the spindle assembly, and lockingly engaged with the nut assembly. The installation process of the electronic expansion valve is as follows: After the connected spindle assembly 60 and nut assembly are attached to the valve seat 42, i.e., the inner wall of the locating hole of the nut is lockingly engaged with the outer wall of the guide sleeve 50, the connecting plate 20 is fitted into the connecting segment 113, and a force is applied to the connecting plate 20 toward the limiting plate 12, causing the connecting plate 20 to abut against the limiting plate 12. The entire nut assembly is then moved toward the chamber of the valve seat 42 until the locking surface abuts against one end of the guide sleeve 50, forming a step between the connecting plate 20 and the side wall of the valve seat 42. The connecting position between the connecting plate 20 and the valve seat 42 is welded, and then the rotor assembly and the spindle assembly are fixedly connected. Finally, the valve cover 41 and the valve seat 42 are fixedly connected to complete the installation of the electronic expansion valve.

[0039] 7 to 9, the nut 10 has an internal thread, and the outer circumferential surface of the nut 10 has a spiral guide groove 13. The nut assembly further includes a retaining ring 70, which is fitted into the spiral guide groove 13 and can rotate along the spiral guide groove 13. The provision of the spiral guide groove 13 avoids the problem of complicated assembly of the nut, retaining ring, and limiting spring in the prior art, and eliminates the need for an additional limiting spring, simplifying the installation process and facilitating automation of the installation of the retaining ring 70 and the nut 10, further improving the production efficiency of the nut assembly.

[0040] Here, the nut assembly further includes a third limiting structure, which is provided on the outer peripheral surface of the nut body 11, is located on the side of the spiral guide groove 13 away from the connecting plate 20, and is engaged with the retaining ring 70. In this way, the movement of the retaining ring 70 within the spiral guide groove 13 can be limited, and when the retaining ring 70 moves within the spiral guide groove 13 toward the side away from the connecting plate 20, it is prevented from coming off the spiral guide groove 13, ensuring reliable movement of the retaining ring 70.

[0041] Specifically, the third limiting structure is a first limiting block 411, which is arranged to protrude from the outer peripheral surface of the nut body 11 and is engaged with the retaining ring 70, and the first limiting block 411 and the nut body 11 have an integral structure.

[0042] In this way, the nut assembly can be easily processed, and by using the first limiting block 411 to limit the movement of the retaining ring 70 within the spiral guide groove 13, it is possible to prevent the retaining ring 70 from coming off the spiral guide groove 13 when it moves within the spiral guide groove 13 away from the connecting plate 20, while at the same time avoiding the problem of the upper stop becoming ineffective due to a malfunction of the limiting spring within the nut assembly, which ensures the reliability of the connection between the nut body 11 and the first limiting block 411 and also ensures the reliability of the movement of the retaining ring 70.

[0043] Alternatively, the third limiting structure is a limiting ring 412, which includes an arc-shaped member 4121 and a first hook 4122 and a second hook 4123 provided on both ends of the arc-shaped member 4121, wherein the first hook 4122 is located on the side of the arc-shaped member 4121 away from the retaining ring 70, and the second hook 4123 is located on the side of the arc-shaped member 4121 facing the retaining ring 70, and the arc-shaped member 4121 and the first hook 4122 are both connected to the nut body 11, and the second hook 4123 is retainingly engaged with the retaining ring 70.

[0044] In this embodiment, by providing the limiting ring 412, the limiting ring 412 can be attached after the retaining ring 70 is assembled to the nut body 11. This facilitates automation of the attachment of the retaining ring 70 and the nut body 11, further improving the production efficiency of nut assemblies. This prevents the retaining ring 70 from being directly fastened to the arc-shaped member 4121 of the limiting ring 412, preventing damage to the arc-shaped member 4121 due to burrs or the like on one end of the retaining ring 70, and ensuring the reliability of the limiting ring 412.

[0045] Specifically, there is an engagement groove 15 on the outer peripheral surface of the nut body 11, and the arc-shaped member 4121 and / or the first hook 4122 are limitedly engaged with the engagement groove 15, and the engagement groove 15 includes a first slot 151 and a second slot 152, the first slot 151 is an arc-shaped groove and is arranged to extend along the circumferential direction of the nut body 11, the second slot 152 extends along the axial direction of the nut body 11, the arc-shaped member 4121 engages with the first slot 151, and the first hook 4122 engages with the second slot 152.

[0046] In this way, the engagement between the arc-shaped member 4121 and the first slot 151 limits the movement of the limiting wheel 412 in the axial direction of the nut body 11, and the engagement between the first hook 4122 and the second slot 152 limits the rotation of the limiting wheel 412 in the circumferential direction of the nut body 11, ensuring the reliability of the connection of the limiting wheel 412.

[0047] Furthermore, the third limiting structure has a first locking surface 4124 protruding from the outer peripheral surface of the nut body 11, and the retaining ring 70 is lockingly engaged with the first locking surface 4124, the fourth limiting structure is provided on the nut body 11 and has a second locking surface 431 protruding from the outer peripheral surface of the nut body 11, and the retaining ring 70 is lockingly engaged with the second locking surface 431, and the spiral guide groove 13 is located between the third limiting structure and the fourth limiting structure.

[0048] In this embodiment, a first locking surface 4124 and a second locking surface 431 are provided that protrude from the outer peripheral surface of the nut body 11, and the retaining ring 70 is locked and engaged with the first locking surface 4124 and the second locking surface 431, respectively, so that the locking positions between the retaining ring 70 and the first locking surface 4124 and the locking positions between the retaining ring 70 and the second locking surface 431 are arranged to protrude from the spiral guide groove 13. This prevents the locking positions between the retaining ring 70 and the first locking surface and the locking positions between the retaining ring 70 and the second locking surface from being located within the spiral guide groove 13 or on an extension of the spiral guide groove 13, as was the case with conventional technology. This prevents powder and the like that is generated after the retaining ring 70 hits the spiral guide groove 13 and prevents the retaining ring 70 from getting stuck, and ensures the reliability of the movement of the retaining ring 70.

[0049] Specifically, the third and fourth limiting structures respectively limit the movement of the retaining ring 70 in two directions along the axis of the nut body 11. The first and second locking surfaces 4124 and 431 are both provided to avoid the spiral guide groove 13 or the extension line of the spiral guide groove 13. This ensures that the locking positions between the retaining ring 70 and the first locking surface and between the retaining ring 70 and the second locking surface are not located within the spiral guide groove 13 or on the extension line of the spiral guide groove 13, preventing powder and the like generated after the retaining ring 70 hits the spiral guide groove 13 from entering and causing the retaining ring 70 to become stuck, and ensuring reliable movement of the retaining ring 70.

[0050] Here, the retaining ring 70 includes a helical member 71 and a third hook 72 and a fourth hook 73 respectively provided at both ends of the helical member 71, the helical member 71 being positioned within the spiral guide groove 13, the third hook 72 being retainingly engaged with the third limiting structure, and the fourth hook 73 being retainingly engaged with the fourth limiting structure.

[0051] In this embodiment, the third hook 72 and the fourth hook 73 are provided, and the retaining ring of the prior art is changed to a retaining ring with hooks on both ends, which increases the retaining area and ensures that no or only a small amount of powder is generated during the retaining collision process, thereby ensuring the performance of the nut assembly.

[0052] Specifically, the third hook 72 extends in a direction away from the outer peripheral surface of the nut body 11, and the fourth hook 73 is located on the side of the helical member 71 facing the fourth limiting structure and extends along the axial direction of the nut body 11. In this embodiment, the third hook 72 is provided perpendicular to the axis of the nut body 11, and the fourth hook 73 is provided at an angle. This makes it easy to set the retaining position of the retaining ring 70 to protrude from the spiral guide groove 13.

[0053] Here, the fourth limiting structure is the second limiting block 43 , the second stop surface 431 is located on the outer wall of the second limiting block 43 , and the retaining ring 70 is stop-engaged with the outer wall of the second limiting block 43 .

[0054] Furthermore, one end of the nut body 11 has an inclined guide surface 115, which is used to guide the limiting ring 412 when it is assembled. In this way, it becomes easy to guide the attachment of the retaining ring 70 and the limiting ring 412 to the nut body 11, and it becomes easy to realize automation of the attachment of the nut assembly.

[0055] Furthermore, the nut assembly further includes a second limiting block 43, which is arranged to protrude from the outer peripheral surface of the nut body 11, is located on the side of the spiral guide groove 13 facing the connecting plate 20, and is engaged with the retaining ring 70, and the second limiting block 43 and the nut body 11 are of an integral structure.

[0056] In this way, the processing of the nut assembly is simplified, and by using the second limiting block 43 to limit the movement of the retaining ring 70 within the spiral guide groove 13, it is possible to prevent the retaining ring 70 from coming off the spiral guide groove 13 when it moves within the spiral guide groove 13 toward the side facing the connecting plate 20, while also avoiding the problem of the prior art in which the bottom stop becomes ineffective due to a malfunction of the limiting spring within the nut assembly, ensuring the reliability of the connection between the nut body 11 and the second limiting block 43 and the reliability of the movement of the retaining ring 70. Specifically, the first limiting block 411 and the second limiting block 43 respectively limit the axial movement of the retaining ring 70 in two directions, thereby ensuring the reliability of the nut assembly.

[0057] Furthermore, the nut body 11 includes a nut segment 111, and the nut segment 111 has two opposing release planes 114 on its outer peripheral surface, the release planes 114 being arranged along the axial direction of the nut segment 111, and the spiral guide groove 13 being arranged on the outer peripheral surface of the nut segment 111, located between the two release planes 114. Providing the release planes 114 makes it easier to process and release the nut body 11, realizes automation of production of the nut body 11, and improves production efficiency of nut assemblies.

[0058] 4, 10 to 12, the electronic expansion valve further includes a rotor assembly 90, which includes a rotor connecting plate 91, a guide seat 92, and a cylindrical magnetic rotor 93. The rotor connecting plate 91 is located in the chamber of the magnetic rotor 93 and is fixedly connected to the magnetic rotor 93. The guide seat 92 is located in the chamber of the magnetic rotor 93 and is fixedly connected to the rotor connecting plate 91, and the guide seat 92 is restrictively engaged with the retaining ring 70. In this embodiment, the rotor connecting plate 91 and the magnetic rotor 93 are driven by an external coil to rotate synchronously, causing the guide seat 92, which is fixedly connected to the rotor connecting plate 91, to rotate synchronously and move along the axial direction of the nut body 11. During the movement of the guide seat 92, the guide seat 92 abuts against the retaining ring 70, which then moves the retaining ring 70 to move spirally on the nut body 11. Specifically, there is a gap between the guide sheet 92 and the inner wall of the chamber of the magnetic rotor 93, or there is no gap between the guide sheet 92 and the inner wall of the chamber of the magnetic rotor 93. Alternatively, there may be no gap between the guide sheet 92 and the magnetic rotor 93, in which case the material of the guide sheet is different from the material of the guide sheet described above. This avoids the prior art need to laser weld the powder metallurgical rotor connecting plate and the guide sheet, which is prone to defects such as blackening and cracks after welding, and ensures the reliability of the rotor assembly 90.

[0059] Here, the rotor connecting plate 91 has a press-fit groove 94, and the guide seat 92 includes a press-fit segment 921 and a limiting segment 922 connected to each other, the press-fit segment 921 and the limiting segment 922 being perpendicular to each other. The press-fit segment 921 is located within the press-fit groove 94, and the limiting segment 922 extends along the axial direction of the nut 10 and is limitingly engaged with the retaining ring 70. The electronic expansion valve further includes a spindle assembly 60, which is threaded into the nut body 11 and fixedly connected to the rotor assembly 90. The limiting engagement between the press-fit segment 921 and the press-fit groove 94 achieves a fixed connection between the rotor connecting plate 91 and the guide seat 92, eliminating the need for welding and reducing processing costs. Optionally, the press-fit segment 921 is interference-fitted into the press-fit groove 94, which is a rectangular groove.

[0060] 13 to 15, there is a balancing passage 030 between the connecting plate 20 and the nut 10, and the balancing passage 030 connects the regions on both sides of the connecting plate 20. In this embodiment, the balancing passage 030 connects the regions on both sides of the connecting plate 20, and further achieves pressure balance between the regions on both sides of the connecting plate 20. This avoids the pressure imbalance that occurs in the chamber regions on both sides of the engaging plate, which occurs in the prior art when the engaging plate and the nut separate the chamber regions on both sides of the engaging plate after the nut assembly is assembled to the valve body assembly, and ensures the reliability and stability of the operation after the nut assembly is assembled to the valve body assembly.

[0061] Specifically, the first limiting structure is located on the nut body 11 and has a first groove 031, and the limiting plate 12 has a second groove 032, and the first groove 031 and the second groove 032 form a balancing passage 030. In this embodiment, the first groove 031 is provided on the first limiting structure and the second groove 032 is provided on the limiting plate 12, which facilitates the processing of the first limiting structure and the limiting plate 12 and reduces the overall dimensions of the first limiting structure and the limiting plate 12, ensuring the miniaturization of the nut assembly and improving the production efficiency of the nut assembly.

[0062] Alternatively, the first limiting structure has a first groove 031, and the second limiting structure has a third groove, with the first groove 031 and the third groove forming a balancing passage 030. The first groove 031 is provided in the first limiting structure, and the third groove is provided in the second limiting structure, which facilitates the processing of the first and second limiting structures and reduces the overall dimensions of the first and second limiting structures, ensuring a compact nut assembly and improving production efficiency of the nut assembly. Specifically, the third groove must be provided to avoid the limiting plate 12, which ensures that the first groove 031 and the third groove, after communication, can communicate with both regions of the connecting plate 20 and ensure the reliability of the balancing passage 030.

[0063] In another embodiment, the outer wall of the nut body 11 has a cutting surface 013, and the balancing passage 030 is located between the cutting surface 013 and the inner wall of the connecting plate 20. This facilitates processing and cutting of the nut body 11, improving the production efficiency of the nut 10. Specifically, the cutting surface 013 may be located at the position where the clamping wire is located when the nut body 11 is clamped and molded. To process the balancing passage 030, the outer periphery of the nut body 11 is cut and the clamping wire on the outer periphery of the nut body 11 is removed at the same time. This prevents the clamping wire from affecting the rotation of the retaining ring around the circumferential direction of the nut body 11 and ensures the reliability of the nut assembly.

[0064] Specifically, the nut body 11 includes a nut segment 111, a transition segment 112, and a connection segment 113 connected in order, and the maximum radial dimension of the limiting plate 12 is greater than the maximum radial dimension of the connection segment 113. The cutting surface 013 includes a first plane 0131, a second plane 0132, a third plane 0133, and a fourth plane 0134 connected in order, wherein the first plane 0131 is located on the nut segment 111, the second plane 0132 is located on the transition segment 112, the third plane 0133 is located on the connection segment 113, and the fourth plane 0134 is located on the limiting plate 12. The third plane 0133 and the fourth plane 0134 are located on the same plane, and the balancing passage 030 is located between the third plane 0133 and the inner wall of the connection plate 20.

[0065] In this embodiment, the first plane 0131, the second plane 0132, the third plane 0133, and the fourth plane 0134 are connected in order, so that the first plane 0131, the second plane 0132, the third plane 0133, and the fourth plane 0134 can be cut and shaped at the same time, facilitating the cutting process of the nut body 11 and improving the processing and production efficiency of the nut body 11. Specifically, the third plane 0133 and the fourth plane 0134 are provided on the same plane, so that the balancing passage 030 located between the third plane 0133 and the connecting plate 20 is prevented from being blocked by the fourth plane 0134, ensuring reliable communication of the balancing passage 030.

[0066] As shown in FIGS. 13 and 16 to 18, the connecting plate 20 and the nut 10 are interference-fitted in the circumferential direction and clearance-fitted in the radial direction.

[0067] In this embodiment, the connecting plate 20 on the nut 10 can move radially of the nut 10 but cannot rotate circumferentially of the nut 10. This avoids the problem in the related art where, during the process of assembling the nut assembly to the valve body assembly, the connecting plate 20 and the valve body assembly are tightly engaged, causing the nut 10 to exceed a predetermined position in the radial direction and making it impossible to ensure coaxiality between the nut assembly and the valve body assembly. This improves the coaxiality between the nut assembly and the valve body assembly, reduces the processing accuracy and processing costs of the nut assembly, reduces the difficulty of assembling the nut assembly, and improves the production efficiency of the nut assembly.

[0068] The nut body 11 is provided with a first limiting structure, the connecting plate 20 includes a connecting ring 021 and a second limiting structure provided on the connecting ring 021, the connecting ring 021 is fitted into the nut body 11 and clearance-fitted to the nut body 11, the first limiting structure and the second limiting structure are clearance-fitted in the radial direction of the connecting ring 021, and the first limiting structure and the second limiting structure are interference-fitted in the circumferential direction of the connecting ring 021. In this way, the limiting engagement between the connecting plate 20 and the nut 10 is achieved by the limiting engagement between the first limiting structure and the second limiting structure, and since the first limiting structure is provided directly on the nut 10 and the second limiting structure is provided directly on the connecting plate 20, processing is facilitated and the overall dimensions of the first limiting structure and the second limiting structure are reduced, ensuring a compact nut assembly.

[0069] Specifically, the first limiting structure includes a limiting protrusion 31 provided on the outer wall of the nut body 11, and the second limiting structure includes a limiting groove 32 provided on the inner wall of the connecting plate 20, with the limiting protrusion 31 located within the limiting groove 32. In this embodiment, the limiting engagement between the first limiting structure and the second limiting structure is designed mainly as the limiting engagement between the limiting block and the limiting groove, resulting in a simple structure, easy processing, and reliable engagement.

[0070] The limiting protrusion 31 has two first limiting surfaces 311 and a first engagement surface 312 located between the two first limiting surfaces 311, and the limiting groove 32 has two second limiting surfaces 321 and a second engagement surface 322 located between the two second limiting surfaces 321, the first engagement surface 312 is clearance-fitted into the second engagement surface 322, and the two first limiting surfaces 311 are limitingly engaged with the two second limiting surfaces 321 in a one-to-one correspondence.

[0071] In this embodiment, the clearance fit between the first engagement surface 312 and the second engagement surface 322 allows the connecting plate 20 to move slightly in the radial direction of the nut body 11, and the two first limiting surfaces 311 are limitedly engaged with the two second limiting surfaces 321 in a one-to-one correspondence, thereby restricting the rotation of the connecting plate 20 in the circumferential direction of the nut body 11. This prevents the connecting plate 20 from exceeding a predetermined position, facilitates the processing and molding of the limiting protrusions and limiting grooves, and provides a simple structure and reliable engagement. Specifically, the two first limiting surfaces 311 are interference-fit with the two second limiting surfaces 321 in a one-to-one correspondence.

[0072] Specifically, the two first limiting surfaces 311 and the two second limiting surfaces 321 are both arranged parallel to one another, and the distance between the two first limiting surfaces 311 is L1, and the distance between the two second limiting surfaces 321 is L2, so that L1-L2≧0.03 mm. In this way, the width of the limiting groove that fits into the outer peripheral surface of the nut body 11 is smaller than the width of the limiting block on the nut body 11, thereby ensuring reliable interference fit between the first limiting surfaces 311 and the second limiting surfaces 321. Specifically, when L1-L2<0.03 mm, the amount of interference between the limiting block and the limiting groove is prevented from being insufficient to limit rotation of the connecting plate 20 along the circumferential direction of the nut body 11, ensuring reliable interference fit between the limiting block and the limiting groove.

[0073] Furthermore, the first engagement surface 312 and the second engagement surface 322 are arcuate surfaces arranged coaxially, and where d3 is the diameter of the first engagement surface 312 and d4 is the diameter of the second engagement surface 322, d4-d3≧0.1 mm. This ensures that the depth of the limiting groove that fits into the outer peripheral surface of the nut body 11 is greater than the length of the limiting block on the nut body 11, thereby ensuring a reliable clearance fit between the first engagement surface 312 and the second engagement surface 322. Specifically, when d4-d3<0.1 mm, this avoids a situation where the gap between the limiting block and the limiting groove is insufficient to move the connecting plate 20 along the radial direction of the nut body 11, ensuring a reliable clearance fit between the limiting block and the limiting groove.

[0074] If the maximum diameter of the nut body 11 is d1 and the inner diameter of the connecting ring 021 is d2, then d2 - d1 ≥ 0.1 mm. In this way, the maximum radial dimension of the nut body 11 is greater than the inner diameter of the connecting ring 021, ensuring reliable movement of the connecting ring 021 along the radial direction of the nut body 11. Specifically, if d2 - d1 < 0.1 mm, the inner wall of the connecting ring 021 will not come into close contact with the outer wall of the nut body 11, preventing the connecting plate 20 from moving along the radial direction of the nut body 11, thereby ensuring reliable clearance fit between the connecting plate 20 and the nut 10.

[0075] In the axial direction of the nut 10, the dimension of the limiting protrusion 31 is greater than the thickness of the connecting plate 20. In this way, the limiting effect of the limiting protrusion on the connecting plate 20 can be ensured.

[0076] As shown in Figures 19 to 21, in another embodiment, a mistake-proofing structure is provided between the nut 10 and the connecting plate 20, and the mistake-proofing structure is used to limit the mounting position of the connecting plate 20 on the nut 10.

[0077] In this embodiment, the connecting plate 20 and the nut 10 are provided separately, which avoids the need to insert a connecting plate when insert-molding the nut assembly, as in the prior art, improving production efficiency and avoiding the problem of the nut with the connecting plate being rendered unusable, thereby enabling better reuse of the nut. Furthermore, this avoids the risk of burrs being present at the connection between the connecting plate and the nut due to process reasons when insert-molding the nut assembly, as in the prior art, which could damage the nut assembly, thereby improving the structural strength of the nut assembly. The provision of a poka-yoke structure ensures that the connecting plate 20 and the nut 10 have a unique correct assembly position. If the position is incorrect, the assembly cannot be completed. This prevents the connecting plate 20 from being installed backwards during the process of mating with the nut 10, thereby ensuring the assembly quality of the nut assembly.

[0078] Specifically, the poka-yoke structure includes a first limiting portion 831 and a second limiting portion 832 provided on the nut body 11, and a third limiting portion 833 and a fourth limiting portion 834 provided on the connecting plate 20, the first limiting portion 831 is limitingly engaged with the third limiting portion 833, the second limiting portion 832 is limitingly engaged with the fourth limiting portion 834, the connecting plate 20 has a burr surface 201, and the poka-yoke structure restricts the burr surface 201 so that it moves away from the limiting plate 12.

[0079] In this embodiment, the connecting plate 20 is removably fitted into the nut body 11 and abuts against the limiting plate 12, and the burr surface 201 of the connecting plate 20 is moved away from the limiting plate 12 due to the limiting engagement between the first limiting portion 831 and the third limiting portion 833 and the limiting engagement between the second limiting portion 832 and the fourth limiting portion 834. Therefore, in the prior art, the worker cannot determine on which side the burr surface of the connecting plate should be positioned during the process of installing the connecting plate, and after the installation of the connecting plate is completed, the burr surface is prevented from abutting against the limiting plate, thereby ensuring the assembly quality of the nut assembly.

[0080] Here, the first limiting portion 831 includes a first limiting block, the second limiting portion 832 includes a second limiting block, the third limiting portion 833 includes a first limiting groove, and the fourth limiting portion 834 includes a second limiting groove, the first limiting block is inserted into the first limiting groove, and the second limiting block is inserted into the second limiting groove, the first limiting block and the second limiting block have different dimensions, and the dimension of the first limiting block is larger than the dimension of the second limiting block in the circumferential direction of the nut 10, and the first limiting groove and the second limiting groove have an included angle A in the circumferential direction of the connecting plate 20, which is 0° <A<180°である。

[0081] In this way, the dimensions and positional relationship of the first limiting block and the second limiting block are further limited. Therefore, when the included angle A between the first limiting groove and the second limiting groove is 180°, even after the connecting plate 20 is turned around in the radial direction, the first limiting block and the first limiting groove, and the second limiting block and the second limiting groove can still be in limiting engagement, but the burr surface 201 is prevented from facing the limiting plate 12, thereby ensuring the reliability of the assembly of the connecting plate 20 and the assembly quality of the nut assembly.

[0082] Alternatively, the poka-yoke structure may further include a fifth limiting portion 35 provided on the nut 10 and a sixth limiting portion 36 provided on the connecting plate 20, wherein the second limiting portion 832 is located between the first limiting portion 831 and the fifth limiting portion 35, the fourth limiting portion 834 is located between the third limiting portion 833 and the sixth limiting portion 36, and the fifth limiting portion 35 is engaged with the sixth limiting portion 36.

[0083] In this embodiment, the nut assembly ensures the reliability of the assembly of the connecting plate 20 and the nut 10 by the limiting engagement at different positions between the three sets of limiting portions, and ensures the assembly quality of the nut assembly. Specifically, the first limiting portion 831, the second limiting portion 832, and the fifth limiting portion 35 are provided at intervals along the circumferential direction of the nut 10, and the third limiting portion 833, the fourth limiting portion 834, and the sixth limiting portion 36 are provided at intervals along the axial direction of the connecting plate 20.

[0084] Specifically, the fifth limiting portion 35 includes a third limiting block, the sixth limiting portion 36 includes a third limiting groove, the third limiting block is inserted into the third limiting groove, and the dimensions of the first limiting portion 831 and the fifth limiting portion 35 are both larger than the dimensions of the second limiting portion 832.

[0085] In this embodiment, the limiting engagement between the two limiting portions is mainly designed as the limiting engagement between the limiting block and the limiting groove, which makes the structure simple, easy to process, and ensures reliable engagement. The dimensions of the first limiting portion 831 and the fifth limiting portion 35 are both larger than the dimension of the second limiting portion 832, and correspondingly, the dimensions of the third limiting portion 833 and the sixth limiting portion 36 are both larger than the dimension of the fourth limiting portion 834. In this way, when the dimensions of the first limiting block or the third limiting block are equal to those of the second limiting block, after the connecting plate 20 is turned around in the radial direction, the burr surface 201 faces the limiting plate 12, but the first limiting block and the first limiting groove, and the second limiting block and the second limiting groove, or the third limiting block and the third limiting groove, and the second limiting block and the second limiting groove, are still able to engage in restrictive engagement. Alternatively, when the dimensions of the first limiting block, the second limiting block, and the third limiting block are all equal, after the connecting plate 20 is turned around in the radial direction, the burr surface 201 faces the limiting plate 12, but the first limiting block and the first limiting groove, the second limiting block and the second limiting groove, and the third limiting block and the third limiting groove, are still able to engage in restrictive engagement. This ensures the reliability of the assembly of the connecting plate 20 and the quality of the assembly of the nut assembly.

[0086] In the circumferential direction of the nut 10, the radial dimension of the first limiting portion 831 is smaller than the dimension of the fifth limiting portion 35, the second limiting portion 832 and the first limiting portion 831 form an included angle B in the circumferential direction of the connecting plate 20, and the second limiting portion 832 and the fifth limiting portion 35 form an included angle C in the circumferential direction of the connecting plate 20, where B = C = 90°. In this way, the dimensions and positional relationships of the first limiting block, the second limiting block, and the third limiting block are further limited, thereby ensuring the reliability of the assembly of the connecting plate 20 and the assembly quality of the nut assembly.

[0087] The second limiting part 832 and the first limiting part 831 have an included angle B in the circumferential direction of the connection plate 20, and the second limiting part 832 and the fifth limiting part 35 have an included angle C in the circumferential direction of the connection plate 20, where 0° < B < 90° and B + C = 180°.

[0088] In this embodiment, the dimensions of the first limiting part 831 and the fifth limiting part 35 are both larger than the dimension of the second limiting part 832, and the dimensions of the first limiting part 831 and the fifth limiting part 35 are the same. Since 0° < B < 90° and B + C = 180°, the included angle between the first limiting part 831 and the fifth limiting part 35 is 180°, and when the included angles between the second limiting part 832 and the first limiting part 831 and the fifth limiting part 35 are both 90°, after inverting the connection plate 20 so that the burr surface 201 faces downward and then rotating the connection plate 20 along the axial direction by a certain angle, the first limiting part 831 is restrictively engaged with the sixth limiting part 36, the second limiting part 832 is restrictively engaged with the fourth limiting part 834, and the third limiting part 833 is restrictively engaged with the fifth limiting part 35, thereby avoiding the situation that the connection plate 20 can still be mounted, ensuring the reliability of the assembly of the connection plate 20, and ensuring the assembly quality of the nut assembly.

[0089] As shown in FIGS. 22 to 26, in another embodiment, the connection plate 20 and the nut 10 in the electronic expansion valve are clearance-fitted in the radial direction. The valve body assembly 40 includes a valve seat 42. The outer wall of the connection plate 20 is fixedly connected to the valve seat 42. The connection plate 20 and the valve seat 42 are clearance-fitted in the axial direction of the nut 10. The electronic expansion valve further includes a guide sleeve 50. The guide sleeve 50 is fixedly provided in the chamber of the valve seat 42. The guide sleeve 50 is inserted into the nut 10. The guide sleeve 50 and the nut 10 are in contact in the axial direction and are interference-fitted in the radial direction.

[0090] In this embodiment, the coaxiality of the guide sleeve 50 and the nut 10 is ensured by restricting the relative movement between the guide sleeve 50 and the nut 10 in the axial and radial directions. Furthermore, when the coaxiality of the nut 10 and the guide sleeve 50 is ensured, sufficient adjustment gaps are provided between the connecting plate 20 and the nut 10, and between the connecting plate 20 and the valve seat 42, which prevents the connecting plate 20 from exceeding a predetermined position during the installation process, thereby preventing the coaxiality of the nut 10 and the guide sleeve 50 from being affected, and improves the coaxiality of the nut assembly. Specifically, the connecting plate 20 and the nut 10 are clearance-fitted in the radial direction, and when the guide sleeve 50 abuts against the nut 10 during the process of installing the nut assembly, there is a gap between the connecting plate 20 and the valve seat 42 in the axial direction of the nut 10. Therefore, in the related art, when the guide sleeve abuts against the nut, the connecting plate and the valve seat also abut against each other in the axial direction of the nut, preventing the nut from exceeding its predetermined position. At the same time, the connecting plate and the valve seat abut against each other in the axial direction of the nut, and the guide sleeve does not abut against the nut, preventing the nut assembly from being positioned inaccurately. This improves the installation accuracy of the nut assembly in the electronic expansion valve and ensures the performance of the electronic expansion valve.

[0091] Here, the nut 10 has a positioning hole 1101, within which is a stop surface 1102. One end of the guide sleeve 50 penetrates the positioning hole 1101, the end face of the guide sleeve 50 abuts against the stop surface 1102, and the outer wall of the guide sleeve 50 is interference-fitted against the inner wall of the positioning hole 1101. Alternatively, the guide sleeve 50 has a positioning hole 1101, within which is a stop surface 1102. One end of the nut 10 penetrates the positioning hole 1101, the end face of the nut 10 abuts against the stop surface 1102, and the outer wall of the nut 10 is interference-fitted against the inner wall of the positioning hole 1101. This facilitates the processing of the nut 10 and the guide sleeve 50, improving the production efficiency of electronic expansion valves. Specifically, in this embodiment, the nut 10 has a positioning hole 1101, and one end of the guide sleeve 50 penetrates into the positioning hole 1101.

[0092] In this embodiment, the electronic expansion valve further includes a positioning protrusion 421 provided in the valve seat 42, which is inserted into one end of the guide sleeve 50 remote from the nut 10, so that the positioning protrusion 421 and the guide sleeve 50 abut in the axial direction and are interference-fitted in the radial direction. In this way, the limited engagement between the positioning protrusion 421 and the guide sleeve 50 ensures the coaxiality of the positioning protrusion 421 and the guide sleeve 50, and further ensures the coaxiality of the valve seat 42, the guide sleeve 50 and the nut assembly, thereby ensuring the performance of the electronic expansion valve.

[0093] Specifically, the positioning protrusion 421 and the valve seat 42 are an integral structure, or the electronic expansion valve includes a valve orifice member 040, which includes a positioning protrusion 421 and a body 042 connected to the positioning protrusion 421, and further includes a valve orifice passing through the body 042 and the positioning protrusion 421, the body 042 being fixedly connected to the valve seat 42, the positioning protrusion 421 penetrating one end of the guide sleeve 50 away from the nut 10, the positioning protrusion 421 being interference-fitted into the guide sleeve 50, and the guide sleeve 50 abutting against the body 042.

[0094] In this embodiment, the positioning protrusion 421 and the valve seat 42 are separate structures, and the valve orifice member 040 is used to position and install the guide sleeve 50, thereby ensuring concentricity between the guide sleeve 50 and the valve seat 42. Specifically, the axis of the valve seat 42 passes through the center of the valve orifice, thereby ensuring concentricity between the nut assembly and the valve orifice and ensuring the reliability of the electronic expansion valve.

[0095] The main body 042 further includes a first shaft segment 0421, a second shaft segment 0422, and a third shaft segment 0423 connected in order, the outer diameters of the first shaft segment 0421, the second shaft segment 0422, and the third shaft segment 0423 decreasing in order, the first shaft segment 0421 connected to the positioning protrusion 421, the valve seat 42 having first and second engaging holes communicating with each other, the diameter of the first engaging hole being larger than the diameter of the second engaging hole, the first shaft segment 0421 extending through the first engaging hole, the second shaft segment 0422 extending through the second engaging hole, and the third shaft segment 0423 positioned outside the valve seat 42. This ensures the reliability of the connection between the main body 042 and the valve seat 42, as well as the coaxiality between the main body 042 and the valve seat 42.

[0096] The inner wall of the valve seat 42 has a first step surface 4221 parallel to the axis of the nut 10 and a second step surface 4222 perpendicular to the axis of the nut 10, and the first step surface 4221 and the second step surface 4222 form a step structure, and the outer wall of the connecting plate 20 is connected to the first step surface 4221, and the connecting plate 20 is clearance-fitted into the second step surface 4222.

[0097] In this way, when the guide sleeve 50 abuts against the stop surface 1102 during the process of installing the nut assembly, a gap is formed between the connecting plate 20 and the valve seat 42 in the axial direction of the nut, which avoids the problem in the related art where, when the guide sleeve abuts against the stop surface, the connecting plate and the valve disc also abut in the axial direction of the nut, causing the nut assembly to exceed its predetermined position. At the same time, this also avoids the problem in the related art where the connecting plate and the valve disc abut in the axial direction of the nut and the guide sleeve does not abut against the stop surface, resulting in inaccurate positioning of the nut assembly. This improves the installation accuracy of the nut assembly in the electronic expansion valve, ensures reliable abutment between the guide sleeve 50 and the stop surface 1102 when positioning the nut assembly, and further improves the reliability of the electronic expansion valve. Furthermore, since the connecting plate 20 is positioned and installed using the stepped structure, processing and positioning for assembly are easier.

[0098] A portion of the connecting plate 20 is located within the stepped structure, and another portion of the connecting plate 20 is located outside the stepped structure, and the connecting plate 20 is welded to the valve seat 42. In this embodiment, the first stepped surface 4221 is connected to the end face of the valve seat 42, and the welding position between the connecting plate 20 and the valve seat 42 is the position of the adhesion line formed between a flat surface of the connecting plate 20 that does not abut the first stepped surface 4221 (i.e., the outer wall of the portion of the connecting plate 20 that is not located within the stepped structure) and the end face of the valve seat 42 that is connected to the first stepped surface 4221. In this manner, a welding allowance is left in advance for welding the connecting plate 20 to the valve seat 42, ensuring the reliability of the welding between the connecting plate 20 and the valve seat 42. Furthermore, since the connecting plate 20 is welded to the valve seat 42, the connection is stable and reliable.

[0099] The valve body assembly 40 further includes a valve cover 41, and the electronic expansion valve further includes a rotor assembly 90, the valve cover 41 is connected to the valve seat 42, the rotor assembly 90 is provided in the valve cover 41 and includes a magnetic rotor 93 and a rotary connecting member provided in the magnetic rotor 93, the rotary connecting member includes a rotor connecting plate 91 and a guide seat 92 connected to each other, the rotor connecting plate 91 is fixedly connected to the magnetic rotor 93, the guide seat 92 extends along the axial direction of the nut 10, and the nut assembly further includes a retaining ring 70 rotatably provided on the nut 10, and the side wall of the guide seat 92 is restrictively engaged with the retaining ring 70.

[0100] In this embodiment, the rotor connecting plate 91 and the magnetic rotor 93 rotate synchronously under the drive of an external coil, and as the guide seat 92 moves, the guide seat 92 abuts against a retaining ring, which then moves and spirals on the nut 10. This avoids the prior art technique of laser welding the powder metallurgical rotor connecting plate and the guide seat, which tends to cause defects such as blackening and cracks after welding, and ensures the reliability of the rotor assembly 90.

[0101] The rotary connecting member may be an integral structure, or the rotor connecting plate 91 and the guide sheet 92 may be two separate structures, with the guide sheet 92 either clearance-fitting the inner wall of the magnetic rotor 93 or tightly contacting the inner wall of the magnetic rotor 93. Because the rotary connecting member in this embodiment has an integral structure, it is easy to process, improving the production efficiency of rotor assemblies. At the same time, in this embodiment, there is no gap between the guide sheet 92 and the magnetic rotor 93, and the material of the guide sheet 92 in this case is different from the material of the guide sheet 92 when there is a gap between them.

[0102] Specifically, the rotor assembly 90 further includes a restrictor 95, the rotor connecting plate 91 has a press-fit groove 94, the restrictor 95 is fitted in the press-fit groove 94, a portion of the nut 10 is fitted in the magnetic rotor 93, and the electronic expansion valve further includes a spindle assembly 60, the screw of which is welded to the restrictor 95 and threaded onto the nut 10. In this manner, the restrictor 95 securely connects the spindle assembly 60 and the rotor connecting plate 91, thereby reducing processing costs. At the same time, because the various components of the rotor assembly 90 are provided separately and the rotary connecting member is provided as an integral structure, this avoids the problems that occur when welding an insert-mounted powder metallurgy rotor assembly to spindle components, which are prone to cracking, demagnetization, and other defects due to heat, as occurs in the prior art, and further ensures the reliability of the rotor assembly 90.

[0103] Alternatively, the restricting member 95 may be interference-fitted into the press-fit groove 94, or the restricting member 95 may be injection-molded integrally with the press-fit groove 94, which may be a rectangular groove, and the restricting member 95 may be welded to the screw of the spindle assembly 60.

[0104] Alternatively, the rotor connecting plate 91 is made of PPS, which has better heat insulating properties, preventing the magnetic rotor 93 from cracking when welding the restricting member 95 to the screw of the spindle assembly 60.

[0105] 25, there is a gap t1 between the connecting plate 20 and the second step surface 4222, and t1 is equal to or greater than 0.2 mm. This prevents the gap t1 from being covered by the stop surface 1102 pressing against the guide sleeve 50, causing the abutting plane to move slightly toward the guide sleeve 50, which would otherwise cause the nut assembly to abut against the connecting plate 20 and the valve disc assembly and exceed a predetermined position, ensuring the reliability of the abutment between the guide sleeve 50 and the stop surface 1102 and the positioning of the nut assembly.

[0106] Furthermore, if the thickness of the connecting plate 20 is t2, then t1≦0.3t2 is satisfied. This avoids the situation where the outer wall of the connecting plate 20 cannot be connected to the valve disc assembly when t1 is too large, ensuring the reliability of the positioning of the nut assembly and the reliability of the connection between the nut assembly and the valve disc assembly.

[0107] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and 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.

Claims

1. A nut (10) including a nut body (11) and a limiting plate (12) connected to each other, the limiting plate (12) having a radial dimension greater than the radial dimension of the nut body (11); a connecting plate (20) that is detachably fitted to the nut body (11) and abuts against the limiting plate (12); Including, The nut (10) has an internal thread, and a spiral guide groove (13) is formed on the outer circumferential surface of the nut (10). The nut assembly further includes a retaining ring (70), which is fitted into the spiral guide groove (13) and can rotate along the spiral guide groove (13). The nut assembly further includes a third limiting structure, the third limiting structure being provided on the outer peripheral surface of the nut body (11), positioned on a side of the spiral guide groove (13) away from the connecting plate (20), and engaged with the retaining ring (70); The third limiting structure is a limiting ring (412), the limiting ring (412) includes an arc-shaped member (4121) and a first hook (4122) and a second hook (4123) provided at both ends of the arc-shaped member (4121), the first hook (4122) is located on the side of the arc-shaped member (4121) away from the retaining ring (70), the second hook (4123) is located on the side of the arc-shaped member (4121) facing the retaining ring (70), the arc-shaped member (4121) and the first hook (4122) are both connected to the nut body (11), and the second hook (4123) is engaged with the retaining ring (70), a nut assembly.

2. 2. The nut assembly according to claim 1, wherein the limiting plate (12) or the nut body (11) has a first limiting structure, and the connecting plate (20) has a second limiting structure, and the first limiting structure is limitingly engaged with the second limiting structure so as to limit the relative positions of the connecting plate (20) and the nut (10) in the circumferential direction.

3. 3. The nut assembly of claim 2, wherein the first limiting structure includes a limiting protrusion (31) provided on an outer wall of the nut body (11), the second limiting structure includes a limiting groove (32) provided on an inner wall of the connecting plate (20), and the limiting protrusion (31) is located within the limiting groove (32).

4. The nut assembly according to claim 3, wherein the limiting protrusions (31) are plural, the plural limiting protrusions (31) are arranged surrounding the nut body (11), and the limiting grooves (32) are plural, the plural limiting grooves (32) are arranged in one-to-one correspondence with the plural limiting protrusions (31).

5. 2. The nut assembly of claim 1, wherein the nut body (11) includes a nut segment (111), a transition segment (112), and a connection segment (113) connected in sequence, the radial dimension of the connection segment (113) being larger than the radial dimension of the nut segment (111), the nut segment (111) having an internal thread, the connection segment (113) being connected to the limiting plate (12), and the connection plate (20) being removably fitted to the connection segment (113).

6. 2. The nut assembly according to claim 1, wherein an engagement groove (15) is provided on the outer peripheral surface of the nut body (11), the arc-shaped member (4121) and / or the first hook (4122) are restrictively engaged with the engagement groove (15), the engagement groove (15) includes a first slot (151) and a second slot (152), the first slot (151) is an arc-shaped groove and is arranged to extend along the circumferential direction of the nut body (11), the second slot (152) extends along the axial direction of the nut body (11), the arc-shaped member (4121) engages with the first slot (151), and the first hook (4122) engages with the second slot (152).

7. 2. The nut assembly according to claim 1, further comprising a second limiting block (43), the second limiting block (43) being provided so as to protrude from the outer peripheral surface of the nut body (11), being located on the side of the spiral guide groove (13) facing the connecting plate (20), and being engaged with the retaining ring (70), the second limiting block (43) and the nut body (11) being of an integral structure.

8. The third limiting structure has a first stop surface (4124) protruding from the outer peripheral surface of the nut body (11), and the retaining ring (70) is stop-engaged with the first stop surface (4124); 2. The nut assembly of claim 1, wherein a fourth limiting structure is provided on the nut body (11) and has a second stop surface (431) protruding from the outer peripheral surface of the nut body (11), the retaining ring (70) is retainingly engaged with the second stop surface (431), and the spiral guide groove (13) is located between the third limiting structure and the fourth limiting structure.

9. A nut (10) including a nut body (11) and a limiting plate (12) connected to each other, the limiting plate (12) having a radial dimension greater than the radial dimension of the nut body (11); a connecting plate (20) that is detachably fitted to the nut body (11) and abuts against the limiting plate (12); Including, The nut (10) has an internal thread, and a spiral guide groove (13) is formed on the outer circumferential surface of the nut (10). The nut assembly further includes a retaining ring (70), which is fitted into the spiral guide groove (13) and can rotate along the spiral guide groove (13). The nut assembly further includes a third limiting structure, the third limiting structure being provided on the outer peripheral surface of the nut body (11), positioned on a side of the spiral guide groove (13) away from the connecting plate (20), and engaged with the retaining ring (70); The third limiting structure has a first stop surface (4124) protruding from the outer peripheral surface of the nut body (11), and the retaining ring (70) is stop-engaged with the first stop surface (4124); a fourth limiting structure provided on the nut body (11) and having a second stop surface (431) protruding from the outer peripheral surface of the nut body (11), the retaining ring (70) is retainingly engaged with the second stop surface (431), and the spiral guide groove (13) is located between the third limiting structure and the fourth limiting structure; The retaining ring (70) includes a helical member (71) and a third hook (72) and a fourth hook (73) respectively provided at both ends of the helical member (71), the helical member (71) is positioned within the spiral guide groove (13), the third hook (72) is engaged with the third limiting structure, and the fourth hook (73) is engaged with the fourth limiting structure, a nut assembly.

10. 10. The nut assembly of claim 9, wherein the third hook (72) extends in a direction away from the outer peripheral surface of the nut body (11), the fourth hook (73) is located on a side of the helical member (71) facing the fourth limiting structure and extends along the axial direction of the nut body (11), the fourth limiting structure is a second limiting block (43), the second stop surface (431) is located on an outer wall of the second limiting block (43), and the retaining ring (70) is stop-engaged with the outer wall of the second limiting block (43).

11. 2. The nut assembly of claim 1, wherein a balancing passage (030) is provided between the connecting plate (20) and the nut (10), the balancing passage (030) communicating regions on both sides of the connecting plate (20).

12. The first limiting structure is located on the nut body (11) and has a first groove (031); The limiting plate (12) has a second groove (032), and the first groove (031) and the second groove (032) form a balancing passage (030), or 3. The nut assembly of claim 2, wherein the first limiting structure has a first groove (031), the second limiting structure has a third groove, and the first groove (031) and the third groove form a balancing passage (030).

13. 12. The nut assembly according to claim 11, wherein the outer wall of the nut body (11) has a cutting surface (013), and the balancing passage (030) is located between the cutting surface (013) and the inner wall of the connecting plate (20).

14. A nut (10) including a nut body (11) and a limiting plate (12) connected to each other, the limiting plate (12) having a radial dimension greater than the radial dimension of the nut body (11); a connecting plate (20) that is detachably fitted to the nut body (11) and abuts against the limiting plate (12); Including, A balancing passage (030) is provided between the connecting plate (20) and the nut (10), and the balancing passage (030) communicates the regions on both sides of the connecting plate (20); The outer wall of the nut body (11) has a cutting surface (013), and the balancing passage (030) is located between the cutting surface (013) and the inner wall of the connecting plate (20); a nut body (11) including a nut segment (111), a transition segment (112), and a connection segment (113) connected in that order, the limiting plate (12) having a maximum radial dimension greater than the maximum radial dimension of the connection segment (113), the cutting surface (013) including a third flat surface (0133) and a fourth flat surface (0134) connected in that order, the third flat surface (0133) being located on the connection segment (113) and the fourth flat surface (0134) being located on the limiting plate (12), the third flat surface (0133) and the fourth flat surface (0134) being on the same plane, and the balancing passage (030) being located between the third flat surface (0133) and an inner wall of the connecting plate (20).

15. The nut assembly according to claim 1, wherein the connecting plate (20) and the nut (10) are interference-fitted in the circumferential direction and clearance-fitted in the radial direction.

16. 16. The nut assembly according to claim 15, wherein the nut body (11) is provided with a first limiting structure, the connecting plate (20) includes a connecting ring (021) and a second limiting structure provided on the connecting ring (021), the connecting ring (021) is fitted to the nut body (11) and clearance-fitted to the nut body (11), the first limiting structure and the second limiting structure are clearance-fitted in a radial direction of the connecting ring (021), and the first limiting structure and the second limiting structure are interference-fitted in a circumferential direction of the connecting ring (021).

17. 17. The nut assembly of claim 16, wherein the first limiting structure includes a limiting protrusion (31) provided on an outer wall of the nut body (11), and the second limiting structure includes a limiting groove (32) provided on an inner wall of the connecting plate (20), and the limiting protrusion (31) is located within the limiting groove (32).

18. 18. The nut assembly of claim 17, wherein the limiting protrusion (31) has two first limiting surfaces (311) and a first engagement surface (312) positioned between the two first limiting surfaces (311), the limiting groove (32) has two second limiting surfaces (321) and a second engagement surface (322) positioned between the two second limiting surfaces (321), the first engagement surface (312) is clearance-fitted into the second engagement surface (322), and the two first limiting surfaces (311) are limitingly engaged with the two second limiting surfaces (321) in a one-to-one correspondence.

19. A nut (10) including a nut body (11) and a limiting plate (12) connected to each other, the limiting plate (12) having a radial dimension greater than the radial dimension of the nut body (11); a connecting plate (20) that is detachably fitted to the nut body (11) and abuts against the limiting plate (12); Including, The connecting plate (20) and the nut (10) are interference-fitted in the circumferential direction and clearance-fitted in the radial direction, The nut body (11) is provided with a first limiting structure, the connecting plate (20) includes a connecting ring (021) and a second limiting structure provided on the connecting ring (021), the connecting ring (021) is fitted into the nut body (11) and clearance-fitted to the nut body (11), the first limiting structure and the second limiting structure are clearance-fitted in the radial direction of the connecting ring (021), and the first limiting structure and the second limiting structure are interference-fitted in the circumferential direction of the connecting ring (021), The first limiting structure includes a limiting protrusion (31) provided on an outer wall of the nut body (11), and the second limiting structure includes a limiting groove (32) provided on an inner wall of the connecting plate (20), and the limiting protrusion (31) is located within the limiting groove (32); The limiting protrusion (31) has two first limiting surfaces (311) and a first engagement surface (312) located between the two first limiting surfaces (311), the limiting groove (32) has two second limiting surfaces (321) and a second engagement surface (322) located between the two second limiting surfaces (321), the first engagement surface (312) is clearance-fitted into the second engagement surface (322), and the two first limiting surfaces (311) are limitingly engaged with the two second limiting surfaces (321) in a one-to-one correspondence; The two first limiting surfaces (311) and the two second limiting surfaces (321) are all arranged in parallel, and when the distance between the two first limiting surfaces (311) is L1 and the distance between the two second limiting surfaces (321) is L2, L1-L2≧0.03 mm; The first engagement surface (312) and the second engagement surface (322) are arcuate surfaces provided coaxially, and when the diameter of the first engagement surface (312) is d3 and the diameter of the second engagement surface (322) is d4, d4-d3≧0.1 mm; If the maximum diameter of the nut body (11) is d1 and the inner diameter of the connecting ring (021) is d2, then d2-d1≧0.1 mm; A nut assembly, wherein the size of the limiting protrusion (31) in the axial direction of the nut (10) is greater than the thickness of the connecting plate (20).

20. 2. The nut assembly according to claim 1, wherein a poka-yoke structure is provided between the nut (10) and the connecting plate (20), and the poka-yoke structure is used to limit the mounting position of the connecting plate (20) on the nut (10).

21. 21. The nut assembly according to claim 20, wherein the poka-yoke structure includes a first limiting portion (831) and a second limiting portion (832) provided on the nut body (11), and a third limiting portion (833) and a fourth limiting portion (834) provided on the connecting plate (20), the first limiting portion (831) is limitingly engaged with the third limiting portion (833), the second limiting portion (832) is limitingly engaged with the fourth limiting portion (834), the connecting plate (20) has a burr surface (201), and the poka-yoke structure limits the burr surface (201) so as to move away from the limiting plate (12).

22. 22. The nut assembly of claim 21, wherein the first limiting portion (831) includes a first limiting block, the second limiting portion (832) includes a second limiting block, the third limiting portion (833) includes a first limiting groove, and the fourth limiting portion (834) includes a second limiting groove, the first limiting block is inserted into the first limiting groove and the second limiting block is inserted into the second limiting groove, the first limiting block and the second limiting block have different dimensions, the dimension of the first limiting block is larger than the dimension of the second limiting block in the circumferential direction of the nut (10), and the first limiting groove and the second limiting groove have an included angle A in the circumferential direction of the connecting plate (20), where 0°<A<180°.

23. 22. The nut assembly according to claim 21, wherein the poka-yoke structure further includes a fifth limiting portion (35) provided on the nut (10) and a sixth limiting portion (36) provided on the connecting plate (20), the second limiting portion (832) is located between the first limiting portion (831) and the fifth limiting portion (35), the fourth limiting portion (834) is located between the third limiting portion (833) and the sixth limiting portion (36), and the fifth limiting portion (35) is engaged with the sixth limiting portion (36).

24. the fifth limiting portion (35) includes a third limiting block, the sixth limiting portion (36) includes a third limiting groove, the third limiting block is inserted into the third limiting groove, and the dimensions of the first limiting portion (831) and the fifth limiting portion (35) are both larger than the dimensions of the second limiting portion (832); In the circumferential direction of the nut (10), the radial dimension of the first limiting portion (831) is smaller than the dimension of the fifth limiting portion (35), the second limiting portion (832) and the first limiting portion (831) have an included angle B in the circumferential direction of the connecting plate (20), and the second limiting portion (832) and the fifth limiting portion (35) have an included angle C in the circumferential direction of the connecting plate (20), where B = C = 90°, The nut assembly of claim 23, wherein the second limiting portion (832) and the first limiting portion (831) have an included angle B in the circumferential direction of the connecting plate (20), and the second limiting portion (832) and the fifth limiting portion (35) have an included angle C in the circumferential direction of the connecting plate (20), where 0°<B<90° and B+C=180°.

25. 1. An electronic expansion valve comprising: a valve body assembly (40) and the nut assembly according to claim 1, wherein the nut assembly is located within the valve body assembly (40), the valve body assembly (40) includes a valve cover (41) and a valve seat (42) connected to each other, at least a portion of the nut body (11) is located within a chamber of the valve cover (41), the limiting plate (12) is located within a chamber of the valve seat (42), and an outer wall of the connecting plate (20) is welded to an inner wall of the valve seat (42).

26. 26. The electronic expansion valve according to claim 25, wherein the valve seat (42) has an opening, the connecting plate (20) is provided in the opening, and where L is a distance between a side of the connecting plate (20) away from the chamber and a plane on which the opening is located, L≧0.02 mm, and where t is a thickness of the connecting plate (20), L<0.4t.

27. 26. The electronic expansion valve according to claim 25, wherein the connecting plate (20) has a balancing hole or a balancing groove (21), and the chamber of the valve seat (42) is connected to the chamber of the valve cover (41) by the balancing hole or the balancing groove (21).

28. 26. The electronic expansion valve of claim 25, further comprising a guide sleeve (50) and a spindle assembly (60), wherein the nut (10) has a positioning hole with a stop surface within the positioning hole, one end of the guide sleeve (50) penetrates the positioning hole, an end face of the guide sleeve (50) abuts against the stop surface, and the spindle assembly (60) is threadedly engaged with the nut body (11) and passes through the guide sleeve (50).

29. 29. The electronic expansion valve according to claim 28, wherein an inner wall of the valve seat (42) has a positioning protrusion (421), the positioning protrusion (421) has a valve port (422), the positioning protrusion (421) penetrates into one end of the guide sleeve (50) away from the nut (10), and the positioning protrusion (421), the guide sleeve (50), the positioning hole and the spindle assembly (60) are arranged coaxially.

30. 29. The electronic expansion valve of claim 28, wherein the nut (10) has a spiral guide groove (13) on its outer peripheral surface, the nut assembly further includes a retaining ring (70), the retaining ring (70) is fitted into the spiral guide groove (13), the electronic expansion valve further includes a rotor assembly (90), the rotor assembly (90) includes a rotor connecting plate (91), a guide seat (92), and a cylindrical magnetic rotor (93), the rotor connecting plate (91) is located in a chamber of the magnetic rotor (93) and fixedly connected to the magnetic rotor (93), the guide seat (92) is located in the chamber of the magnetic rotor (93) and fixedly connected to the rotor connecting plate (91), and the guide seat (92) is restrictively engaged with the retaining ring (70).

31. 31. The electronic expansion valve of claim 30, wherein the rotor connecting plate (91) has a press-fit groove (94), the guide seat (92) includes a press-fit segment (921) and a limiting segment (922) connected to each other, the press-fit segment (921) and the limiting segment (922) being perpendicular to each other, the press-fit segment (921) being located in the press-fit groove (94), the limiting segment (922) extending along the axial direction of the nut (10) and limitingly engaged with the retaining ring (70), and the electronic expansion valve further includes a spindle assembly (60), the spindle assembly (60) being threaded into the nut body (11) and fixedly connected to the rotor assembly (90).

32. 26. The electronic expansion valve according to claim 25, wherein the connecting plate (20) and the nut (10) are clearance-fitted in the radial direction, the connecting plate (20) and the valve seat (42) are clearance-fitted in the axial direction of the nut (10), the electronic expansion valve further includes a guide sleeve (50), the guide sleeve (50) is fixedly provided in a chamber of the valve seat (42), the guide sleeve (50) is inserted onto the nut (10), the guide sleeve (50) and the nut (10) abut in the axial direction and are interference-fitted in the radial direction.

33. The nut (10) has a positioning hole (1101), a stop surface (1102) is provided within the positioning hole (1101), one end of the guide sleeve (50) penetrates into the positioning hole (1101), the end face of the guide sleeve (50) abuts against the stop surface (1102), and the outer wall of the guide sleeve (50) is interference-fitted against the inner wall of the positioning hole (1101), or Alternatively, the guide sleeve (50) has a positioning hole (1101), a stop surface (1102) is provided within the positioning hole (1101), one end of the nut (10) penetrates the positioning hole (1101), the end face of the nut (10) abuts against the stop surface (1102), and the outer wall of the nut (10) is interference-fitted against the inner wall of the positioning hole (1101), an electronic expansion valve as described in claim 32.

34. 33. The electronic expansion valve of claim 32, further comprising a positioning protrusion (421) provided in the valve seat (42), the positioning protrusion (421) being inserted into one end of the guide sleeve (50) remote from the nut (10), the positioning protrusion (421) and the guide sleeve (50) abutting in the axial direction and having an interference fit in the radial direction.

35. 35. The electronic expansion valve according to claim 34, wherein the positioning protrusion (421) and the valve seat (42) are of an integral structure, or the electronic expansion valve includes a valve orifice member (040), the valve orifice member (040) includes the positioning protrusion (421) and a body (042) connected to the positioning protrusion (421), and further includes a valve orifice penetrating the body (042) and the positioning protrusion (421), the body (042) is fixedly connected to the valve seat (42), the positioning protrusion (421) penetrates into one end of the guide sleeve (50) remote from the nut (10), the positioning protrusion (421) is interference-fitted to the guide sleeve (50), and the guide sleeve (50) abuts against the body (042).

36. 36. The electronic expansion valve of claim 35, wherein the main body (042) includes a first shaft segment (0421), a second shaft segment (0422), and a third shaft segment (0423) connected in sequence, the outer diameters of the first shaft segment (0421), the second shaft segment (0422), and the third shaft segment (0423) decreasing in sequence, the first shaft segment (0421) being connected to the positioning protrusion (421), the valve seat (42) having a first engaging hole and a second engaging hole communicating with each other, the diameter of the first engaging hole being larger than the diameter of the second engaging hole, the first shaft segment (0421) extending through the first engaging hole, the second shaft segment (0422) extending through the second engaging hole, and the third shaft segment (0423) being located outside the valve seat (42).

37. 33. The electronic expansion valve of claim 32, wherein an inner wall of the valve seat has a first step surface parallel to the axis of the nut and a second step surface perpendicular to the axis of the nut, the first step surface and the second step surface form a step structure, an outer wall of the connecting plate is connected to the first step surface, the connecting plate is clearance-fitted into the second step surface, a portion of the connecting plate is located within the step structure and another portion of the connecting plate is located outside the step structure, and the connecting plate is welded to the valve seat.

38. The valve body assembly (40) further includes a valve cover (41), and the electronic expansion valve further includes a rotor assembly (90), the valve cover (41) is connected to the valve seat (42), the rotor assembly (90) is provided within the valve cover (41) and includes a magnetic rotor (93) and a rotary connecting member provided within the magnetic rotor (93), the rotary connecting member includes a rotor connecting plate (91) and a guide seat (92) connected to each other, the rotor connecting plate (91) is fixedly connected to the magnetic rotor (93), the guide seat (92) extends along the axial direction of the nut (10), the nut assembly further includes a retaining ring (70) rotatably provided on the nut (10), and a side wall of the guide seat (92) is restrictively engaged with the retaining ring (70), 38. The electronic expansion valve of claim 37, wherein the rotary connecting member is an integral structure, or the rotor connecting plate (91) and the guide seat (92) are two independent structures, and the guide seat (92) is clearance-fitted to the inner wall of the magnetic rotor (93), or the guide seat (92) is tightly attached to the inner wall of the magnetic rotor (93).

39. The electronic expansion valve of claim 37, wherein there is a gap t1 between the connecting plate (20) and the second step surface (4222), t1≧0.2 mm, and t1≦0.3t2, where t2 is the thickness of the connecting plate (20).

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