Electronic expansion valve and assembly method

Abstract

The present invention provides an electronic expansion valve and an assembly method thereof, including: a valve seat having a valve chamber and a valve port; and a spindle disposed within the valve chamber, the spindle including a large spindle and a soft seal connected to the large spindle, the soft seal being used to open and close the valve port, an annular sealing ring formed at the contact point between the outer surface of the soft seal and the inner surface of the valve port, and at least a portion of the soft seal being located outside the area surrounded by the annular sealing ring. In this embodiment, the soft seal is located outside the area surrounded by the annular sealing ring, i.e., the soft seal is relatively large in size, thereby increasing its force-bearing capacity, deformation resistance, and temperature change resistance, thereby ensuring a good sealing effect for the valve port; and even if the soft seal is deformed to a certain extent, it can still have a sufficient sealing contact area when it comes into contact with the valve port, thereby ensuring a good sealing effect. This embodiment improves the reliability of the electronic expansion valve during long-term use.

Description

[Technical Field]

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of the People's Republic of China on December 12, 2022, bearing application number 202211591648.1, for the invention "Electronic expansion valve and assembly method," and to a patent application filed with the State Intellectual Property Office of the People's Republic of China on March 21, 2023, bearing application number 202320622753.0, for the invention "Electronic expansion valve."

[0002] The present invention relates to the technical field of electronic expansion valves, and more particularly to an electronic expansion valve and an assembly method thereof. [Background technology]

[0003] In electronic expansion valves, sealing performance when the valve port is closed is very important. In some embodiments, to ensure sealing performance, a soft seal fitted to the spindle is used to engage with the valve port and close the valve port. However, the outer diameter of a conventional soft seal does not exceed the outer diameter of the spindle. For example, when the soft seal is fitted into a groove in the spindle, the soft seal's relatively small outer diameter makes it prone to deformation after prolonged use, especially in operating environments with relatively high or low temperatures. The deformed soft seal reduces the sealing effect of the valve port, ultimately leading to product failure. Therefore, the soft seal in conventional electronic expansion valves is prone to deformation, resulting in low reliability for long-term use. Summary of the Invention

[0004] The present invention provides an electronic expansion valve and an assembly method that solves the problem of the soft sealing members of the electronic expansion valves of the prior art being easily deformed and resulting in poor sealing performance, and improves the reliability of the electronic expansion valve for long-term use.

[0005] To solve the above problems, the present invention provides an electronic expansion valve including: a valve seat portion having a valve chamber and a valve port; and a spindle portion provided in the valve chamber, the spindle portion including a large spindle and a soft sealing member connected to the large spindle, the soft sealing member being used to open and close the valve port, an annular sealing ring being formed at the position where the outer surface of the soft sealing member contacts the inner surface of the valve port, and at least a portion of the soft sealing member being located outside the area surrounded by the annular sealing ring.

[0006] Furthermore, the electronic expansion valve further includes a guide sleeve, the guide sleeve is located in the valve chamber, the large spindle passes through the guide sleeve, the large spindle reciprocates along the guide sleeve and is sealingly engaged with the guide sleeve, the size of the annular sealing ring is equal to the inner diameter of the guide sleeve, and the outer diameter of the soft sealing member is greater than the outer diameter of the structure where the large spindle is located in the guide sleeve.

[0007] Further, the large spindle includes a position limiting segment and a guide segment connected to each other, wherein the guide segment penetrates the guide sleeve, the position limiting segment is located on one side of the guide sleeve away from the valve orifice, and a radial dimension of the position limiting segment is larger than an inner diameter of the guide sleeve; the spindle portion further includes an inner sealing ring, the inner sealing ring being located between the inner wall of the guide sleeve and the outer wall of the large spindle; The outer wall of the large spindle has an inner sealing groove, an inner sealing ring is mounted in the inner sealing groove, and the outer surface of the inner sealing ring abuts against the inner wall of the guide sleeve.

[0008] The spindle portion further includes a small spindle, the maximum radial dimension of the soft seal member is larger than the maximum radial dimension of the small spindle, the large spindle is fixedly connected to the small spindle, and the soft seal member is interposed between the large spindle and the small spindle.

[0009] Furthermore, the small spindle includes an adjustment segment and an assembly segment connected to each other, the radial dimension of the assembly segment is smaller than the radial dimension of the adjustment segment, the adjustment segment is used to be inserted into the valve orifice, the soft seal member is fitted into the assembly segment, a portion of the assembly segment is inserted into the large spindle, an outer wall of the assembly segment and an inner wall of the large spindle are interference-fitted, one end of the soft seal member is abutted against an end face of the adjustment segment, and the other end of the soft seal member is abutted against the end face of the assembly segment, The adjusting segment has a press-fit groove, the opening of the press-fit groove faces the valve port, and the press-fit groove is used to insert a press-fit tool; The assembly segment has a chamfer on an outer wall at one end away from the valve port; Before assembly, the inner diameter of the inner peripheral surface of the soft seal member is smaller than the outer diameter of the assembly segment, and the axial length of the soft seal member is greater than the distance between the adjustment segment and the large spindle; an inner circumferential surface of the soft seal member has an assembly chamfer at one end thereof facing the adjustment segment; The soft seal member is made of rubber or plastic, and the small spindle and the large spindle are made of metal. Alternatively, the large spindle includes a guide segment and an attachment segment connected to each other, the radial dimension of the attachment segment is smaller than the radial dimension of the guide segment, the soft seal member is fitted to the attachment segment, the small spindle is annular, the small spindle is fitted to the attachment segment, the maximum radial dimension of the soft seal member is larger than the radial dimension of the guide segment, and the soft seal member is sandwiched between the end face of the small spindle and the end face of the guide segment.

[0010] Furthermore, the small spindle includes an adjustment segment and an assembly segment connected to each other, the radial dimension of the assembly segment is smaller than the radial dimension of the adjustment segment, the adjustment segment is used to insert into the valve orifice, and the soft seal member is fitted to the assembly segment; the maximum diameter of the outer peripheral surface of the soft seal element is larger than the maximum inner diameter of the valve orifice, the outer peripheral surface of the soft seal element has a sealing chamfered surface at one end facing the valve orifice, the outer diameter of the end surface of the soft seal element facing the valve orifice is smaller than the inner diameter of the valve orifice, and the end of the valve orifice has a sealing arc-shaped surface at one end facing the valve chamber, wherein the sealing chamfered surface and the sealing arc-shaped surface are sealingly engaged; an inner peripheral surface of the valve orifice is a cylindrical surface; the adjustment segment includes a cylindrical segment and a first tapered segment, the cylindrical segment abuts against the soft sealing member, and one end of the first tapered segment having a larger diameter is connected to the cylindrical segment, wherein there is a gap between the cylindrical segment and the inner peripheral surface of the valve orifice; The adjustment segment further includes a second tapered segment, the larger diameter end of the second tapered segment being connected to the smaller diameter end of the first tapered segment; The taper angle of the second tapered segment is greater than the taper angle of the first tapered segment.

[0011] The electronic expansion valve further includes a nut assembly and a screw assembly, the nut assembly is fixedly connected to the valve seat portion, the screw assembly is threadedly engaged with the nut assembly, and the screw assembly is engaged with the large spindle to drive the spindle portion to reciprocate; The spindle portion further includes a large elastic member, one end of which is in contact with the inner wall of the valve seat portion and the other end of which is in contact with the large spindle, thereby applying a force toward the valve port to the spindle portion; The large elastic member is a spring, and the large elastic member is fitted to the screw assembly; The valve seat portion has a valve seat ring, the screw assembly penetrates the valve seat ring, and one end of the large elastic member abuts against one end of the valve seat ring; The large spindle has an annular member, and the other end of the large elastic member abuts against the annular member; The valve seat has a plurality of through holes distributed in the circumferential direction, and the through holes extend radially of the valve seat and toward the spindle portion; alternatively, a first connecting pipe is provided at the valve port and communicates with the valve port, and a second connecting pipe is provided at the side wall of the valve seat and communicates with the valve chamber of the valve seat.

[0012] Furthermore, the electronic expansion valve further includes a screw assembly, the screw assembly being engaged with the spindle portion to drive the spindle portion to reciprocate; the valve seat portion has a valve seat ring, the screw assembly passes through the valve seat ring, and there is a flow gap between an outer wall of the screw assembly and an inner wall of the valve seat ring; a communication passage is provided within the spindle portion, one end of the communication passage is connected to the valve port and the other end of the communication passage is connected to a chamber within the screw assembly, a first communication hole is provided in a side wall of the screw assembly, and the chamber within the screw assembly is connected to the communication gap via the first communication hole; The electronic expansion valve further includes a nut assembly and a valve pipe, wherein the nut assembly is fixedly connected to the valve seat, the screw assembly is threadedly engaged with the nut assembly, the valve pipe is fixedly connected to the valve seat, the nut assembly is located within a chamber of the valve pipe, and the flow gap is communicated with the chamber within the valve pipe, wherein the side wall of the nut assembly has a second communication hole, the second communication hole communicates between the chamber within the nut assembly and an area outside the nut assembly, and the flow gap is communicated with the chamber within the nut assembly; The spindle portion further includes a small spindle, the large spindle is fixedly connected to the small spindle, the soft seal member is interposed between the large spindle and the small spindle, a first passage is provided in the axial direction within the small spindle, and a second passage is provided in the axial direction within the large spindle, the first passage communicates with the second passage, and the first passage communicates with the valve port, and the second passage communicates with a chamber within the screw assembly.

[0013] The electronic expansion valve further includes a screw assembly, the screw assembly being engaged with the spindle portion to drive the spindle portion to reciprocate, the screw assembly including a screw, an assembly sleeve, a bearing, a bushing and a small elastic member, the screw being connected to the inner ring of the bearing, the outer ring of the bearing being located in the assembly sleeve and being limitedly engaged with the assembly sleeve, the bushing being abutted against one side of the outer ring of the bearing toward the valve port, the small elastic member being fitted into the bushing, one end of the small elastic member away from the bearing abutting against the spindle portion, and the assembly sleeve being fixedly connected to the spindle portion; the bushing has a through hole, and the through hole of the bushing avoids the inner ring of the bearing and the end of the screw; or the bushing has a groove, and the opening of the groove of the bushing faces the screw, and the groove of the bushing avoids the inner ring of the bearing and the end of the screw, and one end of the bushing facing the valve port is a solid structure; the small elastic member is a spring, and both the bushing and the small elastic member are located within the assembly sleeve; the assembly sleeve includes an assembly tube and an annular stop wall, the annular stop wall is located at one end of the assembly tube away from the valve port, a portion of the spindle portion penetrates into the assembly tube and is fixedly connected to the assembly tube, and the outer ring of the bearing abuts against the annular stop wall; The screw has a limiting ring, and one end thereof remote from the valve port of the inner ring of the bearing is abutted against the limiting ring, and the end of the screw is crimped onto one end of the inner ring of the bearing toward the valve port.

[0014] Furthermore, the valve seat portion includes a large valve seat, the large valve seat has a limiting step, an end face of the guide sleeve abuts against the limiting step, and an outer wall of the guide sleeve and an inner wall of the large valve seat are interference-fitted, the valve seat portion further includes a small valve seat, the small valve seat being fixedly connected to the large valve seat, the small valve seat having a valve port; an annular assembly groove is formed between the guide sleeve and the large valve seat, a portion of the small valve seat is inserted into the annular assembly groove, an inner wall of the large valve seat and an outer wall of the small valve seat are interference-fitted, and an outer wall of the guide sleeve and an inner wall of the small valve seat are interference-fitted; the guide sleeve includes a first sleeve segment and a second sleeve segment connected to each other, the outer diameter of the first sleeve segment is larger than the outer diameter of the second sleeve segment, the first sleeve segment and the inner wall of the large valve seat are in restrictive engagement with each other, an annular assembly groove is formed between the second sleeve segment and the inner wall of the large valve seat, and an end face of the small valve seat abuts against an end face of the first sleeve segment; The outer wall of the guide sleeve at one end facing the valve orifice is chamfered, and the outer wall and inner wall of the small valve seat at one end facing away from the valve orifice are both chamfered. The large valve seat has a thread on its outer peripheral surface, a first outer sealing groove on its outer peripheral surface, and a first outer sealing ring is provided in the first outer sealing groove; The small valve seat has a second outer sealing groove on its outer circumferential surface, and a second outer sealing ring is provided in the second outer sealing groove; The small valve seat and the large valve seat are welded together, and the small valve seat has a plurality of through holes distributed in the circumferential direction, which are directed toward the spindle portion.

[0015] The present invention further provides an assembly method, which includes first passing a large spindle through a guide sleeve, and then connecting the large spindle and a soft seal member; The electronic expansion valve further includes a small spindle, and the assembling method includes: passing the large spindle through the guide sleeve; fitting a soft seal member onto the small spindle; and press-fitting one end of the small spindle onto which the soft seal member is fitted into the large spindle passing through the guide sleeve; wherein, before passing the large spindle through the guide sleeve, fitting an inner sealing ring into the inner sealing groove of the large spindle; Alternatively, the electronic expansion valve further includes a small spindle, and the assembling method includes: passing the large spindle through the guide sleeve; fitting the soft seal member to the mounting segment of the large spindle; and fitting the small spindle to the mounting segment of the large spindle, wherein before passing the large spindle through the guide sleeve, fitting an inner sealing ring into the inner sealing groove of the large spindle; The electronic expansion valve further includes a screw assembly, and the assembling method further includes fixedly connecting one end of the large spindle away from the valve port to the screw assembly; the screw assembly, the spindle portion, and the guide sleeve constitute an assembly, and the assembling method further includes installing the assembly into the valve seat portion; The electronic expansion valve further includes a large elastic member, and the assembling method further includes fitting the large elastic member to the screw assembly and abutting one end of the large elastic member against the large spindle, where the assembled assembly includes the large elastic member; the valve seat portion includes a large valve seat and a small valve seat, the small valve seat having a valve orifice; fitting the assembled assembly into the valve seat portion includes inserting a small spindle of the assembled assembly into the small valve seat and pre-penetrating one end of the guide sleeve facing the valve orifice into the small valve seat; aligning an assembly consisting of the assembled assembly and the small valve seat with an opening of a chamber of the large valve seat; applying pressure toward the large valve seat to the small valve seat to press-fit the small valve seat and guide sleeve into the chamber of the large valve seat, wherein an end face of the guide sleeve abuts against a limiting step in the large valve seat, and an outer wall of the guide sleeve and an inner wall of the large valve seat are interference-fitted; an annular assembly groove is formed between the guide sleeve and the large valve seat, and a portion of the small valve seat penetrates into the annular assembly groove, and an inner wall of the large valve seat and an outer wall of the small valve seat are interference-fitted, and an outer wall of the guide sleeve and an inner wall of the small valve seat are interference-fitted; The screw assembly includes a screw, an assembly sleeve, a bearing, a bushing, and a small elastic member, and the assembly method further includes: forcing one end of the screw into the inner ring of the bearing, forming a flange structure on the end of the screw and crimping it to the inner ring of the bearing; press-fitting the bearing into the assembly sleeve; inserting the bushing into the assembly sleeve and abutting it against the outer ring of the bearing; and fitting the small elastic member into the bushing; The electronic expansion valve further includes a nut assembly and a valve pipe, and the assembling method further includes: threading the nut assembly onto the screw assembly and fixedly connecting the nut assembly to the valve seat; and fitting the valve pipe into the nut assembly and fixedly connecting the valve pipe to the valve seat; The assembly method further includes welding the assembly sleeve and the large spindle, welding the small valve seat and the large valve seat, welding the nut assembly and the large valve seat, and welding the valve pipe and the large valve seat.

[0016]

[0010] According to a technical aspect of the present invention, there is provided an electronic expansion valve including: a valve seat having a valve chamber and a valve port; and a spindle provided within the valve chamber, the spindle including a large spindle and a soft seal connected to the large spindle, the soft seal being used to open and close the valve port, an annular sealing ring being formed at the position where the outer surface of the soft seal contacts the inner surface of the valve port, and at least a portion of the soft seal being located outside the area surrounded by the annular sealing ring. In this aspect, the soft seal is located partially outside the area surrounded by the annular sealing ring, i.e., the soft seal is relatively large in size, thereby increasing its force-bearing capacity, deformation resistance, and temperature change resistance, thereby ensuring a sealing effect for the valve port. Compared to the prior art, even if the soft seal undergoes a certain deformation, it can still ensure a sufficient sealing contact area when it contacts the valve port, thereby ensuring a sealing effect. This aspect improves the reliability of the electronic expansion valve during long-term use.

[0017] Furthermore, when the assembly method provided in the present application is used to assemble multiple components in an electronic expansion valve, the operation efficiency is high, the assembly precision is high, the process is easy to implement, and the manufacturing cost is low. [Brief explanation of the drawings]

[0018] The drawings in this specification constitute a part of this application and are used for further understanding of the present invention. The exemplary embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute undue limitations on the present invention.

[0019] [Figure 1] 1 is a structural schematic diagram of an electronic expansion valve provided in an embodiment of the present invention; [Figure 2] FIG. 2 shows a partially enlarged view of the electronic expansion valve shown in FIG. [Figure 3] FIG. 2 shows an enlarged view of a portion of the electronic expansion valve in FIG. [Figure 4] 2 is a schematic diagram showing a partial structure of the electronic expansion valve shown in FIG. 1. [Figure 5] 1 is a schematic diagram showing another structure of a spindle part of an electronic expansion valve. [Figure 6] 1 is a structural schematic diagram of another electronic expansion valve provided in accordance with an embodiment of the present invention;

[0020] Here, the above drawings include the following reference numerals: 100 valve seat portion, 101 valve port, 102 sealing arc surface, 103 valve seat ring, 104 flow hole, 105 flow gap, 110 large valve seat, 111 limiting step, 120 small valve seat, 130 first outer sealing ring, 140 second outer sealing ring, 200 spindle portion, 210 small spindle, 211 adjustment segment, 212 assembly segment, 213 press-fit groove, 214 cylindrical segment, 215 first tapered segment, 216 second tapered segment, 217 first passage, 220 soft seal member, 221 sealing chamfer surface, 222 assembly chamfer, 230 large spindle, 231 position limiting segment, 232 guide segment, 233 annular member, 234 second passage, 235 mounting segment, 240 inner sealing ring, 250 large elastic member, 300 guide sleeve, 310 first sleeve segment, 320 second sleeve segment, 400 nut assembly, 401 second communicating hole, 500 screw assembly, 501 first communicating hole, 510 screw, 520 assembly sleeve, 530 bearing, 540 bushing, 550 small elastic member, 600 valve pipe, 710 first connecting pipe, 720 second connecting pipe. DETAILED DESCRIPTION OF THE INVENTION

[0021] The technical aspects of the embodiments of the present invention will be described clearly and completely below with reference to the drawings in the embodiments of the present invention, but it is clear that the described embodiments are only some of the embodiments of the present invention, and are not all of the embodiments. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present invention.

[0022] As shown in FIGS. 1 to 6 , an embodiment of the present invention provides an electronic expansion valve including: a valve seat member 100 having a valve chamber and a valve port 101; and a spindle member 200 disposed within the valve chamber, the spindle member 200 including a large spindle 230 and a soft sealing member 220 connected to the large spindle 230, the soft sealing member 220 being used to open and close the valve port 101, an annular sealing ring being formed at the position where the outer surface of the soft sealing member 220 contacts the inner surface of the valve port 101, and at least a portion of the soft sealing member 220 being located outside the area surrounded by the annular sealing ring.

[0023] In the present application, a portion of the soft seal 220 is located outside the area surrounded by the annular sealing ring, i.e., the dimensions of the soft seal 220 are relatively large, which increases the force-bearing capacity, deformation resistance, and temperature change resistance of the soft seal 220, thereby ensuring a sealing effect for the valve port 101. Compared with the prior art, even if the soft seal 220 undergoes a certain deformation, it can still ensure a sufficient sealing contact area when it comes into contact with the valve port 101, and can still ensure a sealing effect. This embodiment improves the reliability of the electronic expansion valve for long-term use.

[0024] As shown in FIG. 1 , the electronic expansion valve further includes a guide sleeve 300, which is located within the valve chamber. The large spindle 230 passes through the guide sleeve 300. The large spindle 230 reciprocates along the guide sleeve 300 and is sealingly engaged with the guide sleeve 300. The annular sealing ring has a size equal to the inner diameter of the guide sleeve 300. The outer diameter of the soft seal member 220 is larger than the outer diameter of the structure in which the large spindle 230 is located within the guide sleeve 300, i.e., the outer diameter of the soft seal member 220 is larger than the inner diameter of the guide sleeve 300. The guide sleeve 300 can guide and restrict the large spindle 230. The axes of the guide sleeve 300, the large spindle 230, the small spindle 210, the soft seal member 220, and the valve port 101 are all common in design.

[0025] Specifically, the large spindle 230 includes a position limiting segment 231 and a guide segment 232 connected to each other, where the guide segment 232 passes through the guide sleeve 300 and is connected to the small spindle 210, the position limiting segment 231 is located at one end of the guide sleeve 300 away from the valve orifice 101, and the radial dimension of the position limiting segment 231 is larger than the inner diameter of the guide sleeve 300. A gap is provided between the guide segment 232 and the inner wall of the guide sleeve 300 so that the guide segment 232 can slide smoothly.

[0026] Here, the spindle portion 200 further includes an inner sealing ring 240, which is located between the inner wall of the guide sleeve 300 and the outer wall of the large spindle 230. By providing the inner sealing ring 240, the gap between the guide segment 232 and the inner wall of the guide sleeve 300 can be sealed.

[0027] Specifically, the outer wall of the large spindle 230 has an inner sealing groove, an inner sealing ring 240 is fitted in the inner sealing groove, the guide segments 232 pass through the guide sleeve 300 and are movably and sealingly engaged with the guide sleeve 300 via the inner sealing ring 240, the outer surface of the inner sealing ring 240 abuts against the inner wall of the guide sleeve 300, and the diameter of the annular sealing ring is equal to the outer diameter of the inner sealing ring 240, thereby facilitating assembly of the inner sealing ring 240 and ensuring sealing effectiveness. Alternatively, the inner wall of the guide sleeve 300 has an inner sealing groove, and the inner sealing ring 240 is fitted in the inner sealing groove, and the diameter of the annular sealing ring is equal to the inner diameter of the inner sealing ring 240.

[0028] In this embodiment, an inner sealing ring 240 is provided between the inner wall of guide sleeve 300 and the outer wall of large spindle 230 to seal the gap between the inner wall of guide sleeve 300 and the outer wall of large spindle 230 and prevent internal leakage of the electronic expansion valve. This embodiment improves the sealing effect of the electronic expansion valve at the position of large spindle 230, thereby improving the reliability of the electronic expansion valve. Furthermore, the inner sealing ring 240 can be provided in the inner sealing groove on the outer wall of large spindle 230, or in the inner sealing groove on the inner wall of guide sleeve 300. In this embodiment, the inner sealing ring 240 is preferably provided in the inner sealing groove on the outer wall of large spindle 230, which is easy to install and operate, prevents deformation of the inner sealing ring 240 during the installation process, and ensures a good sealing effect between the large spindle 230 and guide sleeve 300.

[0029] Specifically, this electronic expansion valve is an internal equalizing valve, that is, the spindle part 200 of the electronic expansion valve has an equalizing passage therein, one end of which communicates with the valve port 101 and the other end of which communicates with the region of the spindle part 200 where the end remote from the valve port 101 is located, thereby communicating the fluid at both axial ends of the spindle part 200. The end of the spindle part 200 close to the valve port 101 and the end remote from the valve port 101 are subjected to the same pressure intensity. When the diameter of the annular sealing ring is equal to the outer diameter of the inner sealing ring 240 on the large spindle 230, or when the diameter of the annular sealing ring is equal to the inner diameter of the inner sealing ring 240 on the inner wall of the guide sleeve 300, the end of the spindle part 200 close to the valve orifice 101 and the end remote from the valve orifice 101 are subjected to equal pressure but opposite pressure directions by the fluid from the valve orifice, thereby ensuring the balance of the pressures exerted on the large spindle 230 by the fluid from the valve orifice. The side wall of the valve seat 100 is provided with a through hole 104. When the diameter of the annular sealing ring is equal to the outer diameter of the inner sealing ring 240 on the large spindle 230, or when the diameter of the annular sealing ring is equal to the inner diameter of the inner sealing ring 240 on the inner wall of the guide sleeve 300, the pressure exerted on the valve spindle 200 by the fluid from the through hole 104 is equal in magnitude but opposite in direction, thereby ensuring the balance of the pressure exerted on the large spindle 230 by the fluid from the through hole 104.

[0030] In the above embodiment, the diameter of the annular sealing ring is equal to the outer diameter of the inner sealing ring 240 on the large spindle 230, or the diameter of the annular sealing ring is equal to the inner diameter of the inner sealing ring 240 on the inner wall of the guide sleeve 300. Therefore, after the valve is closed, the total fluid pressure applied to the spindle part 200 by the fluids on both sides of the annular sealing ring is zero, which achieves internal balancing of the electronic expansion valve and reduces the impact of fluid pressure on the valve opening and closing.

[0031] In the present application, the spindle assembly 200 further includes a small spindle 210, a soft seal member 220 having a maximum radial dimension larger than that of the small spindle 210, a large spindle 230 fixedly connected to the small spindle 210, and the soft seal member 220 interposed between the large spindle 230 and the small spindle 210. Because the soft seal member 220 is relatively large, it is difficult to fit and fix it to a one-piece spindle structure during assembly. By providing the spindle structure as a separate structure, the soft seal member 220 is first fitted to the small spindle 210 having a relatively small diameter during assembly, and then the large spindle 230 is fixedly connected to the small spindle 210, thereby realizing both radial and axial restriction for the soft seal member 220, i.e., realizing installation and fixing of the soft seal member 220.

[0032] Because the soft seal member 220 is relatively large, it is difficult to fit and fix it to the integrated spindle structure during assembly. By providing the spindle structure as a separate structure, during assembly, the soft seal member 220 is first fitted onto the small spindle 210, which has a relatively small diameter, and then the large spindle 230 is fixedly connected to the small spindle 210, thereby realizing both radial and axial restrictions for the soft seal member 220, i.e., realizing the installation and fixation of the soft seal member 220.

[0033] In this application, the small spindle 210 includes an adjusting segment 211 and an assembly segment 212 connected to each other. The radial dimension of the assembly segment 212 is smaller than that of the adjusting segment 211. The adjusting segment 211 is used to insert into the valve orifice 101. The soft seal 220 is fitted into the assembly segment 212, with a portion of the assembly segment 212 inserted into the large spindle 230. One end of the soft seal 220 abuts against the end face of the adjusting segment 211, and the other end of the soft seal 220 abuts against the end face of the assembly segment 212. This arrangement ensures a secure connection between the small spindle 210 and the large spindle 230, and the connection can be achieved simply by press-fitting, making the operation easy. Here, there is an interference fit between the outer wall of the assembly segment 212 and the inner wall of the large spindle 230. This arrangement also limits both ends of the soft seal 220, allowing the soft seal 220 to be fixed in two axial directions.

[0034] 1 , the adjusting segment 211 has a press-fit groove 213, the opening of which faces the valve port 101. The press-fit groove 213 is used to insert a press-fit tool, which presses the small spindle 210 and the large spindle 230 into the adjusting segment 211. The adjusting segment 211 in this application is engaged with the valve port 101 to adjust the flow rate. The adjusting segment 211 requires relatively high machining precision. If the press-fit tool applies direct pressure to the end face of the adjusting segment 211, the adjusting segment 211 will be easily deformed, which will affect the normal use of the product. Therefore, the press-fit groove 213 provides a protective function to prevent deformation of the end face of the adjusting segment 211.

[0035] Here, the outer wall of one end of the assembly segment 212 away from the valve orifice 101 has a chamfer, which serves as a guide and makes it easier to insert the assembly segment 212 into the chamber of the large spindle 230.

[0036] Before assembly, the inner diameter of the inner peripheral surface of the soft seal member 220 is smaller than the outer diameter of the assembly segment 212, and the axial length of the soft seal member 220 is greater than the distance between the adjustment segment 211 and the large spindle 230. In this way, the soft seal member 220 is interference-fit with both the small spindle 210 and the large spindle 230, improving the fixing effect on the soft seal member 220 and making the soft seal member 220 less likely to deform during use.

[0037] Here, the inner surface of the soft seal member 220 has an assembly chamfer 222 at one end facing the adjustment segment 211, which makes it easier to insert the assembly segment 212 into the soft seal member 220 and simplifies assembly.

[0038] The soft seal member 220 is made of rubber, plastic or other elastic material, and the small spindle 210 and the large spindle 230 are made of metal, such as stainless steel or copper alloy.

[0039] 5, in another embodiment, the large spindle 230 includes a guide segment 232 and a mounting segment 235 connected to each other, the radial dimension of the mounting segment 235 is smaller than that of the guide segment 232, the soft seal member 220 is fitted to the mounting segment 235, the small spindle 210 is annular, the small spindle 210 is fitted to the mounting segment 235, the maximum radial dimension of the soft seal member 220 is larger than that of the guide segment 232, and the soft seal member 220 is sandwiched between the end face of the small spindle 210 and the end face of the guide segment 232. This method also ensures secure fixation of the soft seal member 220. Specifically, the small spindle 210 and the large spindle 230 can be connected by interference fit or welding.

[0040] In the present application, the small spindle 210 includes an adjustment segment 211 and an assembly segment 212 connected to each other, the radial dimension of the assembly segment 212 is smaller than the radial dimension of the adjustment segment 211, the adjustment segment 211 is used to insert into the valve orifice 101, the soft seal member 220 is fitted into the assembly segment 212, the diameter of the outer circumferential surface of the soft seal member 220 is larger than the maximum inner diameter of the valve orifice 101, and one end of the outer circumferential surface of the soft seal member 220 facing the valve orifice 101 is The soft sealing element 220 has a sealing chamfered surface 221, and the outer diameter of the end surface facing the valve orifice 101 is smaller than the inner diameter of the valve orifice 101. The end of the valve orifice 101 facing the valve chamber has a sealing arc-shaped surface 102, where the sealing chamfered surface 221 and the sealing arc-shaped surface 102 are sealingly engaged. With this structure, the contact area between the soft sealing element 220 and the valve orifice 101 is large, and after the soft sealing element 220 elastically deforms, the soft sealing element 220 and the valve orifice 101 come into surface contact, ensuring a reliable seal with the valve orifice 101.

[0041] Furthermore, the inner surface of the valve port 101 is cylindrical, and the regulating segment 211 includes a cylindrical segment 214 and a first tapered segment 215. The cylindrical segment 214 abuts against the soft seal 220, and the larger-diameter end of the first tapered segment 215 is connected to the cylindrical segment 214, with a gap between the cylindrical segment 214 and the inner surface of the valve port 101. The cylindrical segment 214 not only facilitates burr removal during processing, but also ensures that the largest diameter segment of the small spindle valve 210 is not shortened by burr removal, so that the flow regulating curve of the small spindle 210 is not affected by burr removal. The engagement of the first tapered segment 215 with the inner surface of the valve port 101 ensures that the electronic expansion valve has an appropriate flow regulating curve during the valve opening and closing process, thereby meeting the required operating conditions.

[0042] Furthermore, if necessary, the regulating segment 211 may further include a second tapered segment 216, with the larger-diameter end of the second tapered segment 216 connected to the smaller-diameter end of the first tapered segment 215. By providing different tapered segments, the flow rate regulating curve can be varied to meet customer requirements. Of course, the tapered segments may have three or more stages, if necessary. Here, the taper angle of the second tapered segment 216 may be larger than or smaller than that of the first tapered segment 215. Alternatively, if necessary, the regulating segment 211 may not include the second tapered segment 216, but may instead include a segment with a cylindrical or arcuate surface connected to the first tapered segment 215 to meet flow rate regulation requirements.

[0043] In the present application, the electronic expansion valve further includes a nut assembly 400 and a screw assembly 500, the nut assembly 400 is fixedly connected to the valve seat portion 100, the screw assembly 500 is threadedly engaged with the nut assembly 400, and the screw assembly 500 is engaged with the large spindle 230 to drive the spindle portion 200 to move back and forth, wherein the screw assembly 500 has a driving and guiding function for the spindle portion 200.

[0044] The spindle portion 200 further includes a large elastic member 250, one end of which abuts against the inner wall of the valve seat portion 100 and the other end of which abuts against the large spindle 230, applying a force toward the valve orifice 101 to the spindle portion 200. The large elastic member 250 can offset the force of the fluid acting on the spindle portion 200 to move away from the valve orifice 101. In this way, when the valve orifice 101 is closed, the action of the large elastic member 250 ensures reliable contact between the soft seal member 220 and the valve orifice 101, ensuring a sealing effect. In addition, the presence of the large elastic member 250 makes the spindle portion 200 less likely to shake even when it is subjected to a radial fluid impact force (for example, a force acting on the small spindle 210 by a fluid flowing through the communication hole 104), improving the reliability of valve closure. On the other hand, there is a thread gap between the engaging threads of the nut assembly 400 and the screw assembly 500, and the large elastic member 250 keeps the engaging threads of the nut assembly 400 and the screw assembly 500 abutting in the same direction, thereby eliminating the thread gap. Therefore, the spindle part 200 is not affected by the thread gap during its reciprocating movement, and furthermore, the electronic expansion valve has a relatively high level of flow control accuracy.

[0045] Specifically, the large elastic member 250 is a spring, and the large elastic member 250 is fitted to the screw assembly 500, and the large elastic member 250 is in a compressed state.

[0046] In the present application, the valve seat portion 100 has a valve seat ring 103, the screw assembly 500 penetrates the valve seat ring 103, and one end of the large elastic member 250 abuts against one end of the valve seat ring 103, thereby restricting the large elastic member 250 in the axial direction.

[0047] In the present application, the large spindle 230 has an annular member 233, and the other end of the large elastic member 250 abuts against the annular member 233, thus allowing the large elastic member 250 to be restricted in the axial direction.

[0048] In the present application, the valve seat portion 100 has a plurality of through holes 104 distributed in the circumferential direction, and the through holes 104 extend along the radial direction of the valve seat portion 100 toward the spindle portion 200, thereby realizing communication between the valve chamber of the valve seat portion 100 and other pipeline structures through the through holes 104. Here, when the valve port 101 is opened, the valve port 101 communicates with the through holes 104 via the valve chamber.

[0049] 6, in another embodiment, communication with other pipelines may be achieved by using connecting pipes, for example, a first connecting pipe 710 is provided at the valve port 101 to connect the first connecting pipe 710 to the valve port 101, and a second connecting pipe 720 is provided at the side wall of the valve seat 100 to connect the second connecting pipe 720 to the valve chamber. Here, when the valve port 101 is opened, the second connecting pipe 720 is connected to the first connecting pipe 710, and when the valve port 101 is closed, the second connecting pipe 720 is disconnected from the first connecting pipe 710.

[0050] In this application, the electronic expansion valve further includes a screw assembly 500, which is engaged with the spindle 200 and drives the spindle 200 to reciprocate; the valve seat 100 has a valve seat ring 103, the screw assembly 500 penetrates the valve seat ring 103, and a flow gap 105 is formed between the outer wall of the screw assembly 500 and the inner wall of the valve seat ring 103. The provision of the flow gap 105 is advantageous for achieving pressure equalization on both axial sides of the valve seat 100. Here, the flow gap 105 is provided between the outer wall of the screw assembly 500 and the inner wall of the valve seat ring 103. In this way, there is no need to specially machine grooves or holes in the inner wall of the valve seat 100, and the assembly gap allows fluid to pass through, thereby reducing processing costs.

[0051] Furthermore, the spindle portion 200 has a communication passage, one end of which is connected to the valve port 101 and the other end of which is connected to a chamber in the screw assembly 500. The side wall of the screw assembly 500 has a first communication hole 501, and the chamber in the screw assembly 500 is connected to the communication gap 105 through the first communication hole 501. This is advantageous in realizing pressure equalization on both axial sides of the valve seat portion 100, and more reliably closing the valve port 101.

[0052] In the present application, the electronic expansion valve further includes a nut assembly 400 and a valve pipe 600, the nut assembly 400 is fixedly connected to the valve seat 100, the screw assembly 500 is threaded onto the nut assembly 400, the valve pipe 600 is fixedly connected to the valve seat 100, the nut assembly 400 is located within a chamber of the valve pipe 600, and the flow gap 105 is connected to the chamber of the valve pipe 600, wherein the side wall of the nut assembly 400 has a second communication hole 401, which connects the internal chamber of the nut assembly 400 with the external region of the nut assembly 400, and the flow gap 105 is connected to the chamber within the nut assembly 400, and by providing the second communication hole 401, pressure equalization can be achieved between the internal and external chambers of the nut assembly 400.

[0053] Specifically, the spindle assembly 200 further includes a small spindle 210, a large spindle 230 fixedly connected to the small spindle 210, a soft seal member 220 interposed between the large spindle 230 and the small spindle 210, a first passage 217 extending axially within the small spindle 210, and a second passage 234 extending axially within the large spindle 230, the first passage 217 communicating with the second passage 234, the first passage 217 communicating with the valve port 101, and the second passage 234 communicating with a chamber within the screw assembly 500. In this way, the engagement between the first passage 217 and the second passage 234 establishes communication with the flow gap 105, and the engagement of the multiple passages, holes, and gaps forms a balancing passage, allowing fluid to enter both axial sides of the spindle assembly 200, which is advantageous for achieving pressure balancing.

[0054] In this application, the electronic expansion valve further includes a screw assembly 500, which is engaged with the spindle portion 200 to drive the spindle portion 200 to reciprocate. The screw assembly 500 includes a screw 510, an assembly sleeve 520, a bearing 530, a bushing 540, and a small elastic member 550. The screw 510 is connected to the inner ring of the bearing 530, and the outer ring of the bearing 530 is located in the assembly sleeve 520. The small elastic member 550 is limitedly engaged with the valve orifice 101, the bushing 540 abuts against one side of the outer ring of the bearing 530 facing the valve orifice 101, the small elastic member 550 is fitted into the bushing 540, and one end of the small elastic member 550 away from the bearing 530 abuts against the spindle 200, the assembly sleeve 520 is fixedly connected to the spindle 200, and the small elastic member 550 provides the spindle 200 with a force toward the valve orifice 101, thereby improving the sealing effect when closing the valve orifice 101. When the valve orifice 101 is closed, the sum of the downward force of the fluid received by the valve spindle 200 and the force of the elastic member is greater than the upward force of the fluid received by the valve spindle 200, ensuring the sealing effect for the valve orifice 101. The small elastic member 550 is a spring, and both the bushing 540 and the small elastic member 550 are located within the assembly sleeve 520.

[0055] In the present application, the bushing 540 has a through hole, and the through hole of the bushing 540 avoids the inner ring of the bearing 530 and the end of the screw 510. Alternatively, the bushing 540 has a groove, the opening of the groove of the bushing 540 faces the screw 510, and the groove of the bushing 540 avoids the inner ring of the bearing 530 and the end of the screw 510, and one end of the bushing 540 facing the valve port 101 has a solid structure, which improves the sealing effect for the bearing, prevents impurities from entering the bearing, and extends the service life of the bearing.

[0056] Specifically, the assembly sleeve 520 includes an assembly tube and an annular stop wall, the annular stop wall is located at one end of the assembly tube remote from the valve port 101, a portion of the spindle part 200 penetrates into the assembly tube and is fixedly connected to the assembly tube, and the outer ring of the bearing 530 abuts against the annular stop wall, thereby realizing radial and axial restrictions for the bearing 530 and the assembly sleeve 520. The screw 510 has a limiting ring, and one end of the inner ring of the bearing 530 remote from the valve port 101 abuts against the limiting ring, and the end of the screw 510 is crimped to one end of the inner ring of the bearing 530 facing the valve port 101. The crimping method ensures a reliable connection and high assembly efficiency.

[0057] In the present application, the valve seat portion 100 includes a large valve seat 110, which has a limiting step 111, an end face of the guide sleeve 300 abuts against the limiting step 111, and an outer wall of the guide sleeve 300 and an inner wall of the large valve seat 110 are interference-fitted, thereby realizing mutual restriction and secure connection between the guide sleeve 300 and the large valve seat 110. The valve seat portion 100 further includes a small valve seat 120, which is fixedly connected to the large valve seat 110 and has a valve port 101.

[0058] Here, there is an annular assembly groove between the guide sleeve 300 and the large valve seat 110, and a portion of the small valve seat 120 penetrates into the annular assembly groove, and there is an interference fit between the inner wall of the large valve seat 110 and the outer wall of the small valve seat 120, and there is an interference fit between the outer wall of the guide sleeve 300 and the inner wall of the small valve seat 120, thereby achieving a reliable connection between the guide sleeve 300, the large valve seat 110, and the small valve seat 120 and easily ensuring coaxiality.

[0059] Specifically, the guide sleeve 300 includes a first sleeve segment 310 and a second sleeve segment 320 connected to each other. The outer diameter of the first sleeve segment 310 is larger than that of the second sleeve segment 320. The first sleeve segment 310 and the inner wall of the large valve seat 110 are engaged with each other through a limited engagement. An annular assembly groove is formed between the second sleeve segment 320 and the inner wall of the large valve seat 110. This not only ensures the connection between the guide sleeve 300 and the large valve seat 110, but also provides a space for accommodating the small valve seat 120, facilitating installation of the small valve seat 120. The end face of the small valve seat 120 abuts against the end face of the first sleeve segment 310, thereby limiting the depth of penetration of the small valve seat 120 into the large valve seat 110.

[0060] The outer wall of the guide sleeve 300 at one end facing the valve orifice 101 is chamfered, and the outer and inner walls of the small valve seat 120 at one end facing away from the valve orifice 101 are both chamfered, thereby facilitating the matching of components and the press-fitting operation, i.e., the use of press-fitting makes it easy to fit the guide sleeve 300 and small valve seat 120 into the large valve seat 110. In this embodiment, the small valve seat 120 and the guide sleeve 300 can be pre-butted or fitted together and then pressed into the large valve seat 110 together, eliminating the need for separate press-fitting and allowing assembly to be completed in a single press-fitting operation, thereby improving operational efficiency.

[0061] The outer periphery of the large valve seat 110 has a thread, a first outer sealing groove, and a first outer sealing ring 130. This allows the electronic expansion valve to be attached to another seat body by threading, and the outer sealing ring ensures the sealing between the electronic expansion valve and the seat body and prevents leakage. The outer periphery of the small valve seat 120 has a second outer sealing groove, and a second outer sealing ring 140 is installed in the second outer sealing groove, further improving the sealing effect.

[0062] To improve the connection strength, the small valve seat 120 and the large valve seat 110 may be welded together. The small valve seat 120 has a plurality of through holes 104 distributed in the circumferential direction, which face the spindle portion 200 and allow the communication between the external chamber of the electronic expansion valve and the valve chamber of the valve seat portion 100 for fluid transport.

[0063] The present invention further provides an assembly method for the above-mentioned electronic expansion valve, which includes first inserting the large spindle 230 into the guide sleeve 300, and then connecting the large spindle 230 and the soft seal member 220. This assembly sequence avoids the problem of not being able to connect the large spindle 230, the guide sleeve 300, and the soft seal member 220.

[0064] The electronic expansion valve further includes a small spindle 210, and the assembly method includes inserting a large spindle 230 into a guide sleeve 300, fitting a soft seal 220 onto the small spindle 210, and press-fitting one end of the small spindle 210 onto which the soft seal 220 is fitted into the large spindle 230 that passes through the guide sleeve 300. Because the soft seal 220 in this application is relatively large, it is difficult to directly fit and fix it to a one-piece spindle. However, this assembly method makes it possible to install and fix the large soft seal 220, and the guide sleeve 300 can guide and restrict the large spindle 230. Here, before the large spindle 230 passes through the guide sleeve 300, an inner sealing ring 240 is fitted into the inner sealing groove of the large spindle 230.

[0065] Alternatively, the electronic expansion valve may further include a small spindle 210, and the assembly method may include inserting a large spindle 230 into the guide sleeve 300, fitting the soft seal member 220 into the mounting segment 235 of the large spindle 230, and fitting the small spindle 210 into the mounting segment 235 of the large spindle 230, thereby similarly realizing a positive restriction on the soft seal member 220 and realizing the installation of the large-sized soft seal member 220. Here, before inserting the large spindle 230 into the guide sleeve 300, an inner sealing ring 240 is fitted into the inner sealing groove of the large spindle 230.

[0066] The electronic expansion valve further includes a screw assembly 500, and the assembly method further includes fixedly connecting one end of the large spindle 230 remote from the small spindle 210 to the screw assembly 500, so that the screw assembly 500 can move and displace the spindle portion 200 when it moves.

[0067] The screw assembly 500, the spindle portion 200 and the guide sleeve 300 constitute an assembly, and the assembly method further includes mounting the assembly into the valve seat portion 100, thus achieving assembly of the screw assembly 500, the spindle portion 200, the guide sleeve 300 and the valve seat portion 100.

[0068] The electronic expansion valve further includes a large elastic member 250, and the assembly method further includes fitting the large elastic member 250 to the screw assembly 500 and abutting one end of the large elastic member 250 against the large spindle 230, where the assembly includes the large elastic member 250, in this way, the large elastic member 250 is installed before the assembly is attached to the valve seat portion 100, and the large elastic member 250 cannot be installed in the valve seat portion 100.

[0069] Specifically, the valve seat portion 100 includes a large valve seat 110 and a small valve seat 120, the small valve seat 120 having a valve orifice 101, and fitting the assembled assembly into the valve seat portion 100 includes inserting the small spindle 210 of the assembled assembly into the small valve seat 120 and pre-penetrating one end of the guide sleeve 300 facing the valve orifice 101 into the small valve seat 120, aligning the assembly consisting of the assembled assembly and the small valve seat 120 with the opening of a chamber of the large valve seat 110, and applying pressure toward the large valve seat 110 to the small valve seat 120 to press-fit the small valve seat 120 and the guide sleeve 300 into the chamber of the large valve seat 110; The end face of the guide sleeve 300 abuts against the limiting step 111 in the large valve seat 110, the outer wall of the guide sleeve 300 is interference-fitted with the inner wall of the large valve seat 110, an annular assembly groove is formed between the guide sleeve 300 and the large valve seat 110, a portion of the small valve seat 120 penetrates into the annular assembly groove, the inner wall of the large valve seat 110 is interference-fitted with the outer wall of the small valve seat 120, and the outer wall of the guide sleeve 300 is interference-fitted with the inner wall of the small valve seat 120. This assembly method ensures a reliable connection and high coaxiality between the guide sleeve 300, the large valve seat 110, and the small valve seat 120. Furthermore, in this method, the small valve seat 120 and the guide sleeve 300 are pressed together into the large valve seat 110, eliminating the need for separate press-fitting and allowing for complete assembly in a single press-fitting operation, thereby improving operational efficiency.

[0070] In the present application, the screw assembly 500 includes a screw 510, an assembly sleeve 520, a bearing 530, a bushing 540, and a small elastic member 550, and the assembly method further includes: forcing one end of the screw 510 into the inner ring of the bearing 530, forming a flange structure on the end of the screw 510 and crimping it onto the inner ring of the bearing 530; press-fitting the bearing 530 into the assembly sleeve 520; inserting the bushing 540 into the assembly sleeve 520 and abutting it against the outer ring of the bearing 530; and fitting the small elastic member 550 into the bushing 540, thereby achieving a secure connection between the components of the screw assembly 500.

[0071] Furthermore, the electronic expansion valve further includes a nut assembly 400 and a valve pipe 600, and the assembling method further includes: threading the nut assembly 400 onto the screw assembly 500 and fixing the nut assembly 400 to the valve seat 100; and fitting the valve pipe 600 into the nut assembly 400 and fixing the valve pipe 600 to the valve seat 100; To improve structural strength, the assembly method further includes welding the assembly sleeve 520 to the large spindle 230, welding the small valve seat 120 to the large valve seat 110, welding the nut assembly 400 to the large valve seat 110, and welding the valve pipe 600 to the large valve seat 110. Connecting the mating components using welding further improves reliability and ensures long-term use of the electronic expansion valve. The welding method may be laser welding, brazing, or the like.

[0072] When the above assembly method is used to assemble the components of the electronic expansion valve, the operation efficiency is high, the assembly precision is high, the process is easy to implement, and the manufacturing cost is low.

[0073] The above-mentioned are only preferred embodiments of the present invention, and are not intended to limit the present invention. Those skilled in the art can make various modifications and changes to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. a valve seat (100) having a valve chamber and a valve port (101); and a spindle portion (200) provided in the valve chamber, the spindle portion (200) including a large spindle (230) and a soft seal member (220) connected to the large spindle (230), the soft seal member (220) being used to open and close the valve port (101), an annular sealing ring being formed at a position where an outer surface of the soft seal member (220) contacts an inner surface of the valve port (101), and at least a portion of the soft seal member (220) being located outside an area surrounded by the annular sealing ring.

2. 2. The electronic expansion valve of claim 1, further comprising a guide sleeve (300), the guide sleeve (300) being positioned within the valve chamber, the large spindle (230) penetrating the guide sleeve (300), the large spindle (230) reciprocating along the guide sleeve (300) and being sealingly engaged with the guide sleeve (300), the size of the annular sealing ring being equal to the inner diameter of the guide sleeve (300), and wherein the outer diameter of the soft seal member (220) is greater than the outer diameter of the structure in which the large spindle (230) is positioned within the guide sleeve (300).

3. the large spindle (230) includes a position limiting segment (231) and a guide segment (232) connected to each other, wherein the guide segment (232) penetrates the guide sleeve (300), the position limiting segment (231) is located at one end of the guide sleeve (300) away from the valve orifice (101), and the radial dimension of the position limiting segment (231) is larger than the inner diameter of the guide sleeve (300); The spindle portion (200) further includes an inner sealing ring (240), the inner sealing ring (240) being located between the inner wall of the guide sleeve (300) and the outer wall of the large spindle (230); an outer wall of the large spindle (230) has an inner sealing groove, the inner sealing ring (240) is attached to the inner sealing groove, the guide segment (232) passes through the guide sleeve (300) and is in movable sealing engagement with the guide sleeve (300) via the inner sealing ring (240), the outer surface of the inner sealing ring (240) abuts against the inner wall of the guide sleeve (300), and the diameter of the annular sealing ring is equal to the outer diameter of the inner sealing ring (240); Alternatively, the electronic expansion valve according to claim 2, wherein the inner wall of the guide sleeve (300) has an inner sealing groove, the inner sealing ring (240) is mounted in the inner sealing groove, and the diameter of the annular sealing ring is equal to the inner diameter of the inner sealing ring (240).

4. 2. The electronic expansion valve of claim 1, wherein the large spindle (230) includes a guide segment (232) and a mounting segment (235) connected to each other, the radial dimension of the mounting segment (235) being smaller than the radial dimension of the guide segment (232), the soft seal member (220) being fitted to the mounting segment (235), the spindle portion (200) further includes a small spindle (210), the small spindle (210) being annular and fitted to the mounting segment (235), the maximum radial dimension of the soft seal member (220) being larger than the radial dimension of the guide segment (232), and the soft seal member (220) being sandwiched between an end face of the small spindle (210) and an end face of the guide segment (232).

5. 2. The electronic expansion valve according to claim 1, wherein the spindle portion (200) further includes a small spindle (210), the maximum radial dimension of the soft seal member (220) is larger than the maximum radial dimension of the small spindle (210), the large spindle (230) is connected to the small spindle (210), and the soft seal member (220) is interposed between the large spindle (230) and the small spindle (210).

6. 6. The electronic expansion valve according to claim 5, wherein the soft seal member (220) has a sealing chamfered surface (221), which is used to open and close the valve port (101), the small spindle (210) includes an adjusting segment (211), which is inserted into the valve port (101), and the adjusting segment (211) includes a first tapered segment (215).

7. the inner peripheral surface of the valve orifice (101) is a cylindrical surface, the adjusting segment (211) further includes a cylindrical segment (214), the cylindrical segment (214) is abutted against the soft seal member (220), and one end of the first tapered segment (215) having a larger diameter is connected to the cylindrical segment (214), wherein there is a gap between the cylindrical segment (214) and the inner peripheral surface of the valve orifice (101); The adjusting segment (211) further includes a second tapered segment (216), the larger diameter end of the second tapered segment (216) being connected to the smaller diameter end of the first tapered segment (215); 7. The electronic expansion valve of claim 6, wherein the taper angle of the second tapered segment (216) is greater than the taper angle of the first tapered segment (215).

8. 7. The electronic expansion valve of claim 6, wherein the small spindle further includes an assembly segment connected to the adjusting segment, the assembly segment having a radial dimension smaller than that of the adjusting segment, the soft seal member being fitted to the assembly segment, a portion of the assembly segment extending into the large spindle, one end of the soft seal member being abutted against an end face of the adjusting segment, and the other end of the soft seal member being abutted against an end face of the large spindle.

9. The valve further includes a nut assembly (400) and a screw assembly (500), wherein the nut assembly (400) is fixedly connected to the valve seat portion (100), the screw assembly (500) is threadedly engaged with the nut assembly (400), and the screw assembly (500) is engaged with the large spindle (230) to drive the spindle portion (200) to reciprocate; The spindle portion (200) further includes a large elastic member (250), one end of which abuts against the inner wall of the valve seat portion (100) and the other end of which abuts against the large spindle (230), applying a force to the spindle portion (200) toward the valve orifice (101); The large elastic member (250) is a spring, and the large elastic member (250) is fitted to the screw assembly (500); The valve seat portion (100) has a valve seat ring (103), the screw assembly (500) penetrates the valve seat ring (103), and one end of the large elastic member (250) abuts against one end of the valve seat ring (103), 2. The electronic expansion valve according to claim 1, wherein the large spindle (230) has an annular member (233), and the other end of the large elastic member (250) abuts against the annular member (233).

10. The apparatus further includes a screw assembly (500), the screw assembly (500) being engaged with the spindle portion (200) and driving the spindle portion (200) to reciprocate; 2. The electronic expansion valve according to claim 1, wherein the valve seat portion (100) has a valve seat ring (103), the screw assembly (500) penetrates the valve seat ring (103), and a flow gap (105) is formed between an outer wall of the screw assembly (500) and an inner wall of the valve seat ring (103).

11. a communication passage is provided within the spindle portion (200), one end of the communication passage is connected to the valve port (101) and the other end of the communication passage is connected to a chamber within the screw assembly (500); a first communication hole (501) is provided in a side wall of the screw assembly (500), and the chamber within the screw assembly (500) is connected to the communication gap (105) via the first communication hole (501); 11. The electronic expansion valve of claim 10, further comprising a nut assembly (400) and a valve pipe (600), wherein the nut assembly (400) is fixedly connected to the valve seat (100), the screw assembly (500) is threaded onto the nut assembly (400), the valve pipe (600) is fixedly connected to the valve seat (100), the nut assembly (400) is located within a chamber of the valve pipe (600), and the flow gap (105) is in communication with a chamber within the valve pipe (600), wherein a side wall of the nut assembly (400) has a second communication hole (401), the second communication hole (401) communicates between a chamber within the nut assembly (400) and an area outside the nut assembly (400), and the flow gap (105) is in communication with a chamber within the nut assembly (400).

12. 11. The electronic expansion valve according to claim 10, wherein the spindle portion (200) further includes a small spindle (210), the large spindle (230) is fixedly connected to the small spindle (210), the soft seal member (220) is interposed between the large spindle (230) and the small spindle (210), a first passage (217) is provided in the axial direction within the small spindle (210), and a second passage (234) is provided in the axial direction within the large spindle (230), the first passage (217) is connected to the second passage (234), and the first passage (217) is connected to the valve port (101), and the second passage (234) is connected to a chamber within the screw assembly (500).

13. The screw assembly (500) is engaged with the spindle portion (200) and drives the spindle portion (200) to reciprocate, and the screw assembly (500) includes a screw (510), an assembly sleeve (520), a bearing (530), a bushing (540), and a small elastic member (550), and the screw (510) is connected to the inner ring of the bearing (530), and the outer ring of the bearing (530) is connected to the assembly. The small elastic member (550) is located in the upright sleeve (520) and is limitedly engaged with the assembly sleeve (520), the bushing (540) abuts against one side of the outer ring of the bearing (530) toward the valve port (101), the small elastic member (550) is fitted into the bushing (540), one end of the small elastic member (550) away from the bearing (530) abuts against the spindle portion (200), and the assembly sleeve (520) is fixedly connected to the spindle portion (200); 2. The electronic expansion valve according to claim 1, wherein one end of the bushing (540) facing the valve port (101) has a solid structure.

14. The valve seat portion (100) includes a large valve seat (110), the large valve seat (110) has a limiting step (111), an end face of the guide sleeve (300) abuts against the limiting step (111), and an outer wall of the guide sleeve (300) and an inner wall of the large valve seat (110) are interference-fitted. The valve seat portion (100) further includes a small valve seat (120), the small valve seat (120) is fixedly connected to the large valve seat (110), and the small valve seat (120) has the valve port (101); 3. The electronic expansion valve according to claim 2, wherein an annular assembly groove is formed between the guide sleeve and the large valve seat, a portion of the small valve seat is inserted into the annular assembly groove, an inner wall of the large valve seat and an outer wall of the small valve seat are interference-fitted, and an outer wall of the guide sleeve and an inner wall of the small valve seat are interference-fitted.

15. The guide sleeve (300) includes a first sleeve segment (310) and a second sleeve segment (320) connected to each other, the outer diameter of the first sleeve segment (310) is larger than the outer diameter of the second sleeve segment (320), the first sleeve segment (310) and the inner wall of the large valve seat (110) are in restrictive engagement with each other, the second sleeve segment (320) and the inner wall of the large valve seat (110) have the annular assembly groove therebetween, and an end face of the small valve seat (120) abuts against an end face of the first sleeve segment (310), 15. The electronic expansion valve according to claim 14, wherein the outer wall of the guide sleeve (300) at one end facing the valve port (101) is chamfered, and the outer and inner walls of the small valve seat (120) at one end facing away from the valve port (101) are both chamfered.

16. 3. An assembly method for the electronic expansion valve according to claim 2, comprising: An assembly method comprising first passing the large spindle (230) through the guide sleeve (300), and then connecting the large spindle (230) and the soft seal member (220).

17. The electronic expansion valve further includes a small spindle (210), and the assembling method includes: passing the large spindle (230) through the guide sleeve (300); fitting the soft seal member (220) onto the small spindle (210); and installing one end of the small spindle (210) fitted with the soft seal member (220) into the large spindle (230); or Alternatively, the electronic expansion valve further includes a small spindle (210), and the assembling method according to claim 16 includes passing the large spindle (230) through the guide sleeve (300), fitting the soft seal member (220) to a mounting segment (235) of the large spindle (230), and fitting the small spindle (210) to the mounting segment (235) of the large spindle (230).

18. The electronic expansion valve further includes a screw assembly (500), and the assembling method further includes fixedly connecting one end of the large spindle (230) away from the valve port (101) to the screw assembly (500); 18. The method of claim 17, wherein the screw assembly (500), the spindle portion (200), and the guide sleeve (300) form an assembly, and the method of assembling further comprises mounting the assembly into the valve seat portion (100).

19. The valve seat portion (100) includes a large valve seat (110) and a small valve seat (120), and the small valve seat (120) has a valve orifice (101). Mounting the assembly into the valve seat portion (100) includes inserting a small spindle (210) in the assembly into the small valve seat (120) and pre-inserting one end of the guide sleeve (300) facing the valve orifice (101) into the small valve seat (120), and connecting the assembly consisting of the assembly and the small valve seat (120) with the large valve seat (110). and press-fitting the small valve seat (120) and the guide sleeve (300) into the chamber of the large valve seat (110), wherein an end face of the guide sleeve (300) abuts against a limiting step (111) in the large valve seat (110), an annular assembly groove is formed between the guide sleeve (300) and the large valve seat (110), a portion of the small valve seat (120) penetrates into the annular assembly groove, and the small valve seat (120) and the large valve seat (110) are welded together.

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