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

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[0001] This application claims the priority of a patent application filed with the China National Intellectual Property Administration on December 12, 2022, with an application number of 202211591648. Let the name of the invention be "Electronic Expansion Valve and Assembly Method", and the priority of a patent application filed with the China National Intellectual Property Administration on March 21, 2023, with an application number of 202320622753.0 and the name of the invention being "Electronic Expansion Valve".

[0002] The present invention relates to the technical field of electronic expansion valves, and specifically relates to electronic expansion valves and assembly methods.

Background Art

[0003] When the valve port of an electronic expansion valve is closed, the sealing performance is very important. In some aspects, in order to ensure the sealing effect, a soft seal member fitted on the spindle is adopted to engage with the valve port, and the valve port is closed by the soft seal member. However, the conventional soft seal member has an outer diameter dimension that does not exceed the outer diameter of the spindle. For example, when the soft seal member is fitted into the concave groove on the spindle, the outer diameter dimension of the soft seal member is relatively small. Therefore, especially in a working environment where the temperature is relatively high or relatively low, it is easy to deform after long-term use. The deformed soft seal member has a low sealing effect on the valve port, which in turn causes product failure. Therefore, the soft seal member in the conventional electronic expansion valve has the problem of being easy to deform and has low reliability for long-term use.

Summary of the Invention

[0004] [[ID=三]]The present invention solves the problem that the soft seal member of the electronic expansion valve in the prior art is easy to deform and has low sealing performance, and provides an electronic expansion valve and an assembly method that improve the reliability of long-term use of the electronic expansion valve.

[0005] To solve the above problems, the present invention provides an electronic expansion valve comprising: a valve seat portion having a valve chamber and a valve port; a spindle portion provided within the valve chamber, comprising a large spindle and a soft seal member connected to the large spindle, the soft seal 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 seal member and the inner surface of the valve port come into contact, and at least a portion of the soft seal member being located outside the area surrounded by the annular sealing ring.

[0006] Furthermore, the electronic expansion valve further includes a guide sleeve, which is located within the valve chamber, and a large spindle penetrates the guide sleeve, which reciprocates along the guide sleeve and is sealed with the guide sleeve, the dimensions of which are equal to the inner diameter of the guide sleeve, where the outer diameter of the soft seal member is greater than the outer diameter of the structure in which the large spindle is located within the guide sleeve.

[0007] Furthermore, the large spindle includes a position limiting segment and a guide segment connected to each other, where the guide segment penetrates the guide sleeve, the position limiting segment is located on one side of the guide sleeve away from the valve opening, and the radial dimension of the position limiting segment is greater than the inner diameter of the guide sleeve. The spindle section further includes an inner sealing ring, which is 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, and the inner sealing ring is attached to the inner sealing groove, with the outer surface of the inner sealing ring in contact with the inner wall of the guide sleeve.

[0008] Furthermore, the spindle section includes a smaller spindle, the maximum radial dimension of the soft seal member is larger than the maximum radial dimension of the smaller spindle, the larger spindle is fixedly connected to the smaller spindle, and the soft seal member is interposed between the larger and smaller spindles.

[0009] Furthermore, the small spindle includes an adjustment segment and an assembly segment connected to each other, the radial dimension of the assembly segment being smaller than the radial dimension of the adjustment segment, the adjustment segment being used for insertion into the valve opening, a soft seal member fitted into the assembly segment, a portion of the assembly segment penetrating into the large spindle, the outer wall of the assembly segment and the inner wall of the large spindle being interference-fitted, one end of the soft seal member abutting against the end face of the adjustment segment, and the other end of the soft seal member abutting against the end face of the assembly segment. The adjustment segment has a pressure mounting groove, the opening of which faces the valve opening, and the pressure mounting groove is used for inserting a pressure mounting tool. The outer wall of one end of the assembly segment away from the valve opening has a chamfer. Before assembly, the inner diameter of the inner 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. The inner circumferential surface of the soft seal member has an assembly chamfer at one end facing the adjustment segment. The soft seal component is made of rubber or plastic, while the small and large spindles are made of metal. Alternatively, the large spindle includes guide segments and mounting segments connected to each other, the radial dimension of the mounting segments being smaller than the radial dimension of the guide segments, and the soft seal member is fitted into the mounting segments; the small spindle is annular, the small spindle is fitted into the mounting segments, the maximum radial dimension of the soft seal member is larger than the radial dimension of the guide segments, and the soft seal member is sandwiched between the end face of the small spindle and the end face of the guide segments.

[0010] Furthermore, the small spindle includes an adjustment segment and an assembly segment connected to each other, the radial dimension of the assembly segment being smaller than the radial dimension of the adjustment segment, the adjustment segment being used for insertion into the valve opening, and the soft seal member being fitted into the assembly segment. The maximum diameter of the outer circumferential surface of the soft seal member is greater than the maximum inner diameter of the valve opening, and one end of the outer circumferential surface of the soft seal member facing the valve opening has a sealing chamfered surface, the outer diameter of the end face of the soft seal member facing the valve opening is smaller than the inner diameter of the valve opening, and one end of the valve opening facing the valve chamber has a sealing arc-shaped surface, where the sealing chamfered surface and the sealing arc-shaped surface are sealed and engaged. The inner surface of the valve opening is cylindrical, and the adjustment segment includes a cylindrical segment and a first tapered segment, the cylindrical segment abutting against a soft seal member, and the larger diameter end of the first tapered segment is connected to the cylindrical segment, with a gap between the cylindrical segment and the inner surface of the valve opening. 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 taper segment is greater than the taper angle of the first taper segment.

[0011] Furthermore, the electronic expansion valve further includes a nut assembly and a screw assembly, the nut assembly being fixedly connected to the valve seat, the screw assembly being screwed into the nut assembly, and the screw assembly being engaged with the large spindle to drive the spindle portion to reciprocate. The spindle portion further includes a highly 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 opening to the spindle portion. The highly elastic member is a spring, and the highly elastic member is fitted into the screw assembly. The valve seat portion has a valve seat ring, the screw assembly passes through the valve seat ring, and one end of the highly 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 is in contact with the annular member. The valve seat portion has multiple flow holes distributed in the circumferential direction, the flow holes extending along the radial direction of the valve seat portion and toward the spindle portion, or a first connecting pipe is provided at the valve opening and the first connecting pipe is in communication with the valve opening, and a second connecting pipe is provided on the side wall of the valve seat portion and the second connecting pipe is in communication with the valve chamber of the valve seat portion.

[0012] Furthermore, the electronic expansion valve further includes a screw assembly, which is engaged with the spindle portion to drive the spindle portion to reciprocate. The valve seat portion has a valve seat ring, the screw assembly penetrates the valve seat ring, and there is a flow gap between the outer wall of the screw assembly and the inner wall of the valve seat ring. The spindle section has a flow passage, one end of which communicates with a valve opening, and the other end of which communicates with a chamber in the screw assembly. The side wall of the screw assembly has a first communication hole, and the chamber in the screw assembly communicates with the flow gap through the first communication hole. The electronic expansion valve further includes a nut assembly and a valve pipe, the nut assembly being fixedly connected to the valve seat, the screw assembly being screwed onto the nut assembly, the valve pipe being fixedly connected to the valve seat, the nut assembly being located within the chamber of the valve pipe, the flow gap communicating with the chamber within the valve pipe, the side wall of the nut assembly having a second communication hole, the second communication hole communicating with the chamber inside the nut assembly and the region outside the nut assembly, the flow gap communicating with the chamber inside the nut assembly, The spindle section further includes a small spindle, the large spindle is fixedly connected to the small spindle, a soft seal member is interposed between the large spindle and the small spindle, the small spindle has a first passage provided in the axial direction, the large spindle has a second passage provided in the axial direction, the first passage communicates with the second passage, the first passage communicates with a valve port, and the second passage communicates with a chamber in the screw assembly.

[0013] Furthermore, the electronic expansion valve further includes a screw assembly, which is engaged with the spindle portion to drive the spindle portion to reciprocate, and the screw assembly includes a screw, an assembly sleeve, a bearing, a bush and a small elastic member, the screw is connected to the inner ring of the bearing, the outer ring of the bearing is located within the assembly sleeve and is limitedly engaged with the assembly sleeve, the bush abuts against one side of the outer ring of the bearing facing the valve opening, the small elastic member is fitted into the bush, one end of the small elastic member away from the bearing abuts against the spindle portion, and the assembly sleeve is fixedly connected to the spindle portion. The bush has a through hole, and the through hole of the bush avoids the inner ring of the bearing and the end of the screw, or the bush has a groove, the opening of the groove of the bush faces the screw, the groove of the bush avoids the inner ring of the bearing and the end of the screw, and one end of the bush facing the valve opening is a solid structure. The small elastic component is a spring, and both the bush and the small elastic component are located within the assembly sleeve. The assembly sleeve includes an assembly cylinder and an annular retaining wall, the annular retaining wall being located at one end of the assembly cylinder away from the valve opening, a portion of the spindle portion penetrating into the assembly cylinder and fixedly connected to the assembly cylinder, and the outer ring of the bearing abutting against the annular retaining wall. The screw has a limiting ring, with one end away from the valve opening of the inner ring of the bearing in contact with the limiting ring, and the other end of the screw crimped to the end facing the valve opening of the inner ring of the bearing.

[0014] Furthermore, the valve seat section includes a large valve seat, the large valve seat has a limiting step, the end face of the guide sleeve abuts against the limiting step, and the outer wall of the guide sleeve and the inner wall of the large valve seat are interference-fitted. The valve seat portion further includes a smaller valve seat, the smaller valve seat is fixedly connected to the larger valve seat, and the smaller valve seat has a valve opening. An annular assembly groove is provided between the guide sleeve and the large valve seat, a portion of the small valve seat is inserted into the annular assembly groove, the inner wall of the large valve seat and the outer wall of the small valve seat are interference-fitted, and the outer wall of the guide sleeve and the 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 being larger than the outer diameter of the second sleeve segment, the first sleeve segment being restrictedly engaged with the inner wall of the large valve seat, an annular assembly groove between the second sleeve segment and the inner wall of the large valve seat, and the end face of the small valve seat being in contact with the end face of the first sleeve segment. The outer wall of one end of the guide sleeve facing the valve opening has a chamfer, and the outer and inner walls of the end of the small valve seat away from the valve opening both have chamfers. The outer surface of the large valve seat has threads, the outer surface of the large valve seat has a first outer sealing groove, and a first outer sealing ring is provided within the first outer sealing groove. The outer surface of the small valve seat has a second outer sealing groove, and a second outer sealing ring is provided within the second outer sealing groove. The smaller valve seat and the larger valve seat are welded together, and the smaller valve seat has multiple flow holes distributed circumferentially, with the flow holes facing the spindle.

[0015] The present invention further provides an assembly method which includes first passing the large spindle through the guide sleeve, and then connecting the large spindle to the soft seal member. The electronic expansion valve further includes a small spindle, and the assembly method includes passing the large spindle through the guide sleeve, fitting a soft seal member onto the small spindle, and pressing one end of the small spindle with the soft seal member fitted into the large spindle passing through the guide sleeve, wherein, before passing the large spindle through the guide sleeve, an inner sealing ring is fitted into the inner sealing groove of the large spindle, Alternatively, the electronic expansion valve further includes a small spindle, and the assembly method includes passing the large spindle through a guide sleeve, fitting a soft sealing member onto the mounting segment of the large spindle, and fitting the small spindle onto the mounting segment of the large spindle, wherein, before passing the large spindle through the guide sleeve, an inner sealing ring is fitted 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 part and the guide sleeve constitute an assembly for assembly, and the assembling method further includes mounting the assembly for assembly into the valve seat part. The electronic expansion valve further includes a large elastic member, and the assembling method further includes fitting the large elastic member onto the screw assembly and abutting one end of the large elastic member against the large spindle. Here, the assembly for assembly includes the large elastic member. The valve seat part includes a large valve seat and a small valve seat. The small valve seat has a valve port. Mounting the assembly for assembly into the valve seat part includes inserting the small spindle in the assembly for assembly into the small valve seat and pre-inserting one end of the guide sleeve facing the valve port into the small valve seat, aligning the assembly composed of the assembly for assembly and the small valve seat with the opening of the chamber of the large valve seat, applying pressure towards the large valve seat to the small valve seat, and pressing and mounting the small valve seat and the guide sleeve into the chamber of the large valve seat. Here, the end face of the guide sleeve abuts against the limiting step in the large valve seat, the outer wall of the guide sleeve and the inner wall of the large valve seat are in interference fit, an annular assembling groove is formed between the guide sleeve and the large valve seat, a part of the small valve seat penetrates into the annular assembling groove, the inner wall of the large valve seat and the outer wall of the small valve seat are in interference fit, and the outer wall of the guide sleeve and the inner wall of the small valve seat are in interference fit. The screw assembly includes a screw, an assembling sleeve, a bearing, a bush and a small elastic member. The assembling method further includes pushing one end of the screw into the inner ring of the bearing, forming a flange structure at the end of the screw and caulking it to the inner ring of the bearing, pressing and mounting the bearing into the assembling sleeve, putting the bush into the assembling sleeve and abutting it against the outer ring of the bearing, and fitting the small elastic member onto the bush. The electronic expansion valve further includes a nut assembly and a valve pipe. The assembly method further includes screwing the nut assembly onto the screw assembly and fixedly connecting the nut assembly to the valve seat portion, and fitting the valve pipe onto the nut assembly and fixedly connecting the valve pipe to the valve seat portion. 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] When the technical aspect of the present invention is applied, there is provided 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 seal member connected to the large spindle. The soft seal member is used to open and close the valve port. An annular sealing ring is formed at a position where the outer surface of the soft seal member contacts the inner surface of the valve port. The soft seal member is located outside a region at least partially surrounded by the annular sealing ring. In this aspect, since the soft seal member is located outside a region at least partially surrounded by the annular sealing ring, that is, the size of the soft seal member is relatively increased, the force-receiving capacity, deformation resistance, and temperature change resistance of the soft seal member are all increased, ensuring the sealing effect on the valve port. Compared with the prior art, it can be ensured that even if a certain deformation occurs in the soft seal member, there is still a sufficient sealing contact area when contacting the valve port, and the sealing effect can still be ensured. Therefore, this aspect improves the reliability of the long-term use of the electronic expansion valve.

[0017] Also, when the assembly method provided in this application is adopted to assemble multiple components in the electronic expansion valve, the operation efficiency is high, the assembly accuracy is high, the process is easily realized, and the manufacturing cost is low.

Brief Description of the Drawings

[0018] The drawings herein constitute part of this application and are used for a further understanding of the invention. Exemplary embodiments and descriptions of the invention are used to illustrate the invention and do not constitute an unreasonable limitation to the invention.

[0019] [Figure 1] A schematic diagram of the structure of an electronic expansion valve provided by an embodiment of the present invention is shown. [Figure 2] Figure 1 shows a magnified view of the electronic expansion valve. [Figure 3] Figure 2 shows a magnified view of the electronic expansion valve in Figure 1. [Figure 4] Figure 1 shows a schematic diagram of a part of the structure of the electronic expansion valve. [Figure 5] Another schematic diagram of the spindle section in an electronic expansion valve is shown. [Figure 6] A schematic diagram of another electronic expansion valve provided by an embodiment of the present invention is shown.

[0020] The above drawing includes the following reference numerals: 100 Valve seat, 101 Valve opening, 102 Sealing arc surface, 103 Valve seat ring, 104 Flow hole, 105 Flow clearance, 110 Large valve seat, 111 Restricting step, 120 Small valve seat, 130 First outer sealing ring, 140 Second outer sealing ring, 200 Spindle section, 210 Small spindle, 211 Adjustment segment, 212 Assembly segment, 213 Press mounting groove, 214 Cylindrical segment, 215 First tapered segment, 216 Second tapered segment, 217 First passage, 220 Soft seal member, 221 Sealing chamfered 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 communication hole, 500 Screw assembly, 501 First through 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. [Modes for carrying out the invention]

[0021] With reference to the drawings of embodiments of the present invention, the technical aspects of embodiments of the present invention are described below clearly and completely, although it is clear that the embodiments described are merely some embodiments of the present invention and not all embodiments. All other embodiments that a person skilled in the art could obtain without creative effort based on the embodiments of the present invention are all within the scope of the protection of the present invention.

[0022] As shown in Figures 1 to 6, an embodiment of the present invention provides an electronic expansion valve comprising: a valve seat portion 100 having a valve chamber and a valve port 101; and a spindle portion 200 provided within the valve chamber, which includes 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 the position where the outer surface of the soft seal member 220 and the inner surface of the valve port 101 come into contact, and the soft seal member 220 being located outside the region surrounded by the annular sealing ring, at least a portion of which is located outside the region surrounded by the annular sealing ring.

[0023] In this application, the soft seal member 220 is located outside the region surrounded by the annular sealing ring, that is, the dimensions of the soft seal member 220 are made relatively large. As a result, the force-bearing capacity, deformation resistance, and temperature change resistance of the soft seal member 220 are all increased, ensuring a sealing effect with respect to the valve opening 101. Compared to the conventional technology, even if a certain deformation occurs in the soft seal member 220, it is possible to ensure that there is still a sufficient sealing contact area when it comes into contact with the valve opening 101, thus ensuring a sealing effect. Therefore, this embodiment improves the reliability of long-term use of the electronic expansion valve.

[0024] As shown in Figure 1, the electronic expansion valve further includes a guide sleeve 300, which is located within the valve chamber, and the large spindle 230 passes through the guide sleeve 300. The large spindle 230 reciprocates along the guide sleeve 300 and is sealed with the guide sleeve 300, and the dimensions of the annular sealing ring are equal to the inner diameter of the guide sleeve 300. Here, 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 located within the guide sleeve 300, i.e., the outer diameter of the soft seal member 220 is greater than the inner diameter of the guide sleeve 300. The guide sleeve 300 can perform guiding and restricting functions for the large spindle 230. Here, the axis of the guide sleeve 300, the axis of the large spindle 230, the axis of the small spindle 210, the axis of the soft seal member 220, and the axis of the valve port 101 are common lines in the 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 penetrates the guide sleeve 300 and is connected to the small spindle 210, and the position limiting segment 231 is located at one end of the guide sleeve 300 away from the valve opening 101, with the radial dimension of the position limiting segment 231 being greater than the inner diameter of the guide sleeve 300. There is a gap between the guide segment 232 and the inner wall of the guide sleeve 300 to allow the guide segment 232 to 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, the inner sealing ring 240 is attached to the inner sealing groove, the guide segment 232 penetrates the guide sleeve 300 and is movably sealed and 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, the diameter of the annular sealing ring is equal to the outer diameter of the inner sealing ring 240, in this way the assembly of the inner sealing ring 240 is made easier and the sealing effect is ensured. Alternatively, the inner wall of the guide sleeve 300 has an inner sealing groove, the inner sealing ring 240 is attached to 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, by providing an inner sealing ring 240 between the inner wall of the guide sleeve 300 and the outer wall of the large spindle 230, the gap between the inner wall of the guide sleeve 300 and the outer wall of the large spindle 230 is sealed, preventing internal leakage of the electronic expansion valve. This embodiment improves the reliability of the electronic expansion valve by improving the sealing effect at the position of the large spindle 230 of the electronic expansion valve. Furthermore, the inner sealing ring 240 can be provided in the inner sealing groove of the outer wall of the large spindle 230 or in the inner sealing groove of the inner wall of the guide sleeve 300. In this embodiment, it is preferable to provide the inner sealing ring 240 in the inner sealing groove of the outer wall of the large spindle 230, as it is easy to install and operate, avoids deformation of the inner sealing ring 240 during the installation process, and ensures the sealing effect between the large spindle 230 and the guide sleeve 300.

[0029] Specifically, this electronic expansion valve is an internal balancing valve, meaning that the spindle portion 200 of the electronic expansion valve has a balancing passage, one end of which communicates with the valve port 101, and the other end of which communicates with the region where the end of the spindle portion 200 away from the valve port 101 is located, and in this way the fluid at both ends of the spindle portion 200 in the axial direction is communicated. The end of the spindle portion 200 close to the valve port 101 and the end far from the valve port 101 receive the same pressure intensity. When the diameter of the annular sealing ring is equal to the outer diameter of the inner sealing ring 240 provided 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 provided on the inner wall of the guide sleeve 300, the end of the spindle portion 200 that is close to the valve port 101 and the end that is farther from the valve port 101 will have the same magnitude of pressure from the fluid from the valve port, but the direction of the pressure will be opposite, that is, the equilibrium of the pressure that the fluid from the valve port applies to the large spindle 230 is ensured. A flow hole 104 is provided in the side wall of the valve seat portion 100. When the diameter of the annular sealing ring is equal to the outer diameter of the inner sealing ring 240 provided 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 provided on the inner wall of the guide sleeve 300, the valve spindle portion 200 receives the same magnitude of pressure from the fluid from the flow hole 104, but in opposite directions. In other words, the pressure applied by the fluid from the flow hole 104 to the large spindle 230 is balanced.

[0030] In the above embodiment, by making the diameter of the annular sealing ring equal to the outer diameter of the inner sealing ring 240 provided on the large spindle 230, or by making the diameter of the annular sealing ring equal to the inner diameter of the inner sealing ring 240 provided on the inner wall of the guide sleeve 300, after the valve is closed, the total fluid pressure applied to the spindle portion 200 by the fluids on both sides of the annular sealing ring is zero, that is, internal equilibrium of the electronic expansion valve is achieved, and the influence of fluid pressure on valve opening and closing can be reduced.

[0031] In this application, 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 fixedly connected to the small spindle 210, and the soft seal member 220 is interposed between the large spindle 230 and the small spindle 210. Because the dimensions of the soft seal member 220 are relatively large, it is difficult to fit and fix it into the integrated spindle structure when assembling. By providing the spindle structure as a segmented structure, when assembling, the soft seal member 220 is first fitted into 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 achieving restrictions on the soft seal member 220 in both the radial and axial directions, i.e., enabling the attachment and fixing of the soft seal member 220.

[0032] Because the dimensions of the soft seal member 220 are relatively large, it is difficult to fit and fix it into the integrated spindle structure during assembly. By providing the spindle structure as a separate structure, the soft seal member 220 is first fitted into the small spindle 210, which has a relatively small diameter, and then the large spindle 230 is fixedly connected to the small spindle 210. This provides constraints on the soft seal member 220 in both the radial and axial directions, thus enabling the attachment and fixing of the soft seal member 220.

[0033] In this 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 being smaller than the radial dimension of the adjustment segment 211, the adjustment segment 211 being used for insertion into the valve opening 101, the soft seal member 220 being fitted into the assembly segment 212, a portion of the assembly segment 212 penetrating into the large spindle 230, one end of the soft seal member 220 being in contact with the end face of the adjustment segment 211, and the other end of the soft seal member 220 being in contact with the end face of the assembly segment 212, and by providing the above, a reliable connection between the small spindle 210 and the large spindle 230 is achieved, and the connection can be achieved simply by adopting a press-fit method, making it easy to operate. Here, the outer wall of the assembly segment 212 and the inner wall of the large spindle 230 are interference-fitted. Furthermore, by providing the above, both ends of the soft seal member 220 can be restricted, and the soft seal member 220 can be fixed in two axial directions.

[0034] As shown in Figure 1, the adjustment segment 211 has a pressure mounting groove 213, the opening of which faces the valve port 101. The pressure mounting groove 213 is used to insert a pressure mounting tool, which is used to press and mount the small spindle 210 and the large spindle 230. The adjustment segment 211 in this application engages with the valve port 101 and has the function of adjusting the flow rate. The adjustment segment 211 requires relatively high machining precision, and if the pressure mounting tool applies pressure directly to the end face of the adjustment segment 211, the adjustment segment 211 is prone to deformation, which affects the normal use of the product. Therefore, by providing the pressure mounting groove 213, a protective effect is achieved to prevent deformation of the end of the adjustment segment 211.

[0035] Here, the outer wall of one end of the assembly segment 212 away from the valve opening 101 has a chamfer, which in this way can act as a guide, making 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 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-fitted with both the small spindle 210 and the large spindle 230, improving the fixing effect on the soft seal member 220 and making it less likely to deform during use.

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

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

[0039] Alternatively, as shown in Figure 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 being smaller than the radial dimension of the guide segment 232, and the soft seal member 220 being fitted into the mounting segment 235; the small spindle 210 is annular, the small spindle 210 is fitted into the mounting segment 235, the maximum radial dimension of the soft seal member 220 is larger than the radial dimension 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. In this configuration as well, secure fixing of the soft seal member 220 can be achieved. Specifically, the small spindle 210 and the large spindle 230 can be connected by interference fit or welding.

[0040] In this 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 being smaller than the radial dimension of the adjustment segment 211, the adjustment segment 211 being used for insertion into the valve opening 101, the soft seal member 220 being fitted into the assembly segment 212, the diameter of the outer circumferential surface of the soft seal member 220 being larger than the maximum inner diameter of the valve opening 101, and one end of the outer circumferential surface of the soft seal member 220 facing the valve opening 101 The soft seal member 220 has a sealing chamfered surface 221, and the outer diameter of the end face of the soft seal member 220 facing the valve port 101 is smaller than the inner diameter of the valve port 101. The end of the valve port 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 sealed and engaged. By adopting the above structure, the contact area between the soft seal member 220 and the valve port 101 is large, and after the soft seal member 220 elastically deforms, the soft seal member 220 and the valve port 101 come into surface contact, ensuring a reliable seal to the valve port 101.

[0041] Furthermore, the inner surface of the valve port 101 is cylindrical, and the adjustment segment 211 includes a cylindrical segment 214 and a first tapered segment 215. The cylindrical segment 214 abuts against the soft seal member 220, and the larger diameter end of the first tapered segment 215 is connected to the cylindrical segment 214. There is a gap between the cylindrical segment 214 and the inner surface of the valve port 101. By providing the cylindrical segment 214, not only is it easier to remove burrs during the manufacturing process, but at the same time, it is ensured that the largest diameter segment of the small spindle valve 210 is not shortened due to the effects of burr removal, so that the small spindle 210 is not affected by the flow rate adjustment curve due to burr removal. The engagement of the first tapered segment 215 with the inner surface of the valve port 101 allows the electronic expansion valve to have an appropriate flow rate adjustment curve during the valve opening and closing process, thereby meeting the requirements of the working conditions.

[0042] Furthermore, if necessary, the adjustment 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 variations in the flow rate adjustment curve can be enriched, meeting customer usage requirements. Naturally, the tapered segments may be three or more stages, if necessary. Here, the taper angle of the second tapered segment 216 is either larger than the taper angle of the first tapered segment 215, or smaller than the taper angle of the first tapered segment 215. Alternatively, if necessary, the adjustment segment 211 may not include the second tapered segment 216, but instead have one segment with a cylindrical or arcuate surface connected to the first tapered segment 215 to meet the flow rate adjustment requirements.

[0043] In this application, the electronic expansion valve further includes a nut assembly 400 and a screw assembly 500, the nut assembly 400 being fixedly connected to the valve seat portion 100, the screw assembly 500 being screwed onto the nut assembly 400, and the screw assembly 500 being engaged with the large spindle 230 to drive the spindle portion 200 to reciprocate, wherein the screw assembly 500 has a driving and guiding function with respect to 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, thereby applying a force toward the valve opening 101 to the spindle portion 200. The large elastic member 250 can counteract the force exerted by the fluid on the spindle portion 200 that causes it to move away from the valve opening 101. In this way, when closing the valve opening 101, the large elastic member 250 ensures reliable contact between the soft seal member 220 and the valve opening 101, thereby ensuring a sealing effect. Furthermore, the presence of the large elastic member 250 makes the spindle portion 200 less prone to shaking even when subjected to radial fluid impact forces (for example, the force exerted on the small spindle 210 by fluid flowing in from the flow hole 104), improving the reliability of valve closing. On the other hand, the engagement threads between the nut assembly 400 and the screw assembly 500 have a thread gap, and the highly elastic member 250 maintains that the engagement threads between the nut assembly 400 and the screw assembly 500 are in contact in the same direction, thereby eliminating the thread gap. As a result, the spindle portion 200 is not affected by the thread gap during its reciprocating movement, and furthermore, the accuracy of the flow control of the electronic expansion valve is ensured to be relatively high.

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

[0046] In this 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 high elasticity member 250 abuts against one end of the valve seat ring 103, thereby allowing the high elasticity member 250 to be restricted in the axial direction.

[0047] In this 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, thereby allowing the large elastic member 250 to be restricted in the axial direction.

[0048] In this application, the valve seat portion 100 has a plurality of flow holes 104 distributed in the circumferential direction, and the flow holes 104 extend along the radial direction of the valve seat portion 100 and toward the spindle portion 200, so that the valve chamber of the valve seat portion 100 can communicate with other pipeline structures via the flow holes 104. Here, when the valve opening 101 is opened, the valve opening 101 communicates with the flow holes 104 via the valve chamber.

[0049] As shown in Figure 6, in other embodiments, for example, communication with other pipelines may be achieved by a connecting pipe system in which a first connecting pipe 710 is provided at the valve port 101 to connect the first connecting pipe 710 and the valve port 101, and a second connecting pipe 720 is provided on the side wall of the valve seat portion 100 to connect the second connecting pipe 720 and the valve chamber. Here, when the valve port 101 is open, the second connecting pipe 720 and the first connecting pipe 710 are in communication, and when the valve port 101 is closed, the second connecting pipe 720 and the first connecting pipe 710 are blocked.

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

[0051] Furthermore, the spindle portion 200 has a flow passage, one end of which communicates with the valve port 101, and the other end of which communicates with the 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 communicates with the flow gap 105 via the first communication hole 501. In this way, it is advantageous to achieve pressure equalization on both sides of the valve seat portion 100 in the axial direction, and it is more reliable when closing the valve port 101.

[0052] In this application, the electronic expansion valve further includes a nut assembly 400 and a valve pipe 600, the nut assembly 400 being fixedly connected to the valve seat portion 100, the screw assembly 500 being screwed onto the nut assembly 400, the valve pipe 600 being fixedly connected to the valve seat portion 100, the nut assembly 400 being located within the chamber of the valve pipe 600, the flow gap 105 communicating with the chamber of the valve pipe 600, the nut assembly 400 having a second communication hole 401 in its side wall, the second communication hole 401 communicating the chamber inside the nut assembly 400 with the region outside the nut assembly 400, the flow gap 105 communicating with the chamber inside the nut assembly 400, and by providing the second communication hole 401, pressure equalization between the internal and external chambers of the nut assembly 400 can be achieved.

[0053] Specifically, the spindle section 200 further includes a small spindle 210, the large spindle 230 is fixedly connected to the small spindle 210, and the soft seal member 220 is interposed between the large spindle 230 and the small spindle 210. The small spindle 210 has a first passage 217 provided in the axial direction, and the large spindle 230 has a second passage 234 provided in the axial direction. The first passage 217 communicates with the second passage 234, and the first passage 217 communicates with the valve port 101, and the second passage 234 communicates with the chamber in the screw assembly 500. In this way, the engagement of the first passage 217 and the second passage 234 enables communication with the flow gap 105, and the engagement of multiple passages, holes, and gaps forms an equilibrium passage. In this way, fluid can enter both sides of the spindle section 200 in the axial direction, which is advantageous for achieving pressure equilibrium.

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

[0055] In this application, the bush 540 has a through hole, and the through hole of the bush 540 avoids the inner ring of the bearing 530 and the end of the screw 510. Alternatively, the bush 540 has a groove, the opening of which faces the screw 510, and the groove of the bush 540 avoids the inner ring of the bearing 530 and the end of the screw 510, and one end of the bush 540 facing the valve port 101 is solid. In this way, the sealing effect on the bearing can be improved, impurities can be prevented from entering the bearing, and the service life of the bearing can be extended.

[0056] Specifically, the assembly sleeve 520 includes an assembly cylinder and an annular retaining wall, the annular retaining wall being located at one end of the assembly cylinder away from the valve opening 101, a portion of the spindle 200 penetrating into the assembly cylinder and fixedly connected to it, and the outer ring of the bearing 530 abutting against the annular retaining wall, thereby achieving radial and axial restrictions on the bearing 530 and the assembly sleeve 520. The screw 510 has a limiting ring, one end of the inner ring of the bearing 530 away from the valve opening 101 abutting against the limiting ring, and the end of the screw 510 is crimped to the end of the inner ring of the bearing 530 facing the valve opening 101. The crimping method ensures a secure connection and high assembly efficiency.

[0057] In this application, the valve seat portion 100 includes a large valve seat 110, the large valve seat 110 has a limiting step 111, the end face of the guide sleeve 300 abuts against the limiting step 111, and the outer wall of the guide sleeve 300 and the inner wall of the large valve seat 110 are interference-fitted, thus achieving 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, the small valve seat 120 is fixedly connected to the large valve seat 110, and the small valve seat 120 has a valve opening 101.

[0058] Here, an annular assembly groove is provided between the guide sleeve 300 and the large valve seat 110, a portion of the small valve seat 120 is inserted into the annular assembly groove, the inner wall of the large valve seat 110 and the outer wall of the small valve seat 120 are interference-fitted, and the outer wall of the guide sleeve 300 and the inner wall of the small valve seat 120 are interference-fitted, thereby ensuring a secure connection between the three components of 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 being 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 being restrictedly engaged, and an annular assembly groove being provided between the second sleeve segment 320 and the inner wall of the large valve seat 110. This arrangement not only ensures the connection between the guide sleeve 300 and the large valve seat 110, but also creates a space for accommodating the small valve seat 120, making it easy to install the small valve seat 120. Here, the end face of the small valve seat 120 abuts against the end face of the first sleeve segment 310, thus limiting the penetration depth of the small valve seat 120 into the large valve seat 110.

[0060] The outer wall of one end of the guide sleeve 300 facing the valve opening 101 has a chamfer, and the outer and inner walls of the end of the small valve seat 120 away from the valve opening 101 both have chamfers. In this way, the alignment and pressing operation of the parts is made easier, that is, the guide sleeve 300 and the small valve seat 120 can be easily installed inside the large valve seat 110 by the pressing method. In this embodiment, the small valve seat 120 and the guide sleeve 300 may be pre-butted or fitted together, and then pushed together into the large valve seat 110. In this way, it is not necessary to press them separately, the assembly can be completed in one pressing operation, and it is not necessary to press them twice, improving operational efficiency.

[0061] Here, the outer circumferential surface of the large valve seat 110 has threads, the outer circumferential surface of the large valve seat 110 has a first outer sealing groove, and a first outer sealing ring 130 is provided in the first outer sealing groove. In this way, the electronic expansion valve can be attached to other seat bodies by a screw-fitting method, and by providing an outer sealing ring, the airtightness between the electronic expansion valve and the seat body is ensured, preventing leakage. The outer circumferential surface of the small valve seat 120 has a second outer sealing groove, and a second outer sealing ring 140 is provided in the second outer sealing groove. In this way, the sealing effect can be further improved.

[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 flow holes 104 distributed in the circumferential direction, and the flow holes 104 face the spindle portion 200. The flow holes 104 enable communication between the external chamber of the electronic expansion valve and the valve chamber of the valve seat portion 100, thereby transporting fluid.

[0063] The present invention further provides an assembly method used for the above-mentioned electronic expansion valve, the 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, and by adopting such an assembly sequence, the problem of not being able to connect the large spindle 230, the guide sleeve 300 and the soft seal member 220 is avoided.

[0064] The electronic expansion valve further includes a small spindle 210, and the assembly method includes passing the large spindle 230 through the guide sleeve 300, fitting the soft seal member 220 onto the small spindle 210, and pressing one end of the small spindle 210 with the soft seal member 220 fitted onto it into the large spindle 230 that passes through the guide sleeve 300. Because the dimensions of the soft seal member 220 in this application are relatively large, it is difficult to directly fit and fix it onto a spindle with an integrated structure, but this assembly method enables the attachment and fixing of the large soft seal member 220, and the guide sleeve 300 can perform a guiding and restricting action on the large spindle 230. Hereinafter, before passing the large spindle 230 through the guide sleeve 300, the inner sealing ring 240 is fitted into the inner sealing groove of the large spindle 230.

[0065] Alternatively, the electronic expansion valve further includes a small spindle 210, and the assembly method includes passing the large spindle 230 through the guide sleeve 300, fitting the soft seal member 220 onto the mounting segment 235 of the large spindle 230, and fitting the small spindle 210 onto the mounting segment 235 of the large spindle 230, in this way a secure restraint on the soft seal member 220 is achieved, and the mounting of a large soft seal member 220 is achieved. Here, before passing the large spindle 230 through the guide sleeve 300, the inner seal ring 240 is fitted into the inner seal groove of the large spindle 230.

[0066] The electronic expansion valve further includes a screw assembly 500, and the assembly method further includes fixing one end of the large spindle 230 away from the small spindle 210 to the screw assembly 500, so that the screw assembly 500 can move the spindle portion 200 when it is in motion.

[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, thereby achieving the 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 into the screw assembly 500 and bringing one end of the large elastic member 250 into contact with the large spindle 230, where the assembly includes the large elastic member 250, in this way the large elastic member 250 is attached before the assembly is mounted on the valve seat portion 100, thus avoiding the inability to mount the large elastic member 250 inside the valve seat portion 100.

[0069] Specifically, the valve seat section 100 includes a large valve seat 110 and a small valve seat 120, the small valve seat 120 having a valve opening 101, and mounting the assembly into the valve seat section 100 includes inserting the small spindle 210 of the assembly into the small valve seat 120 and pre-inserting one end of the guide sleeve 300 toward the valve opening 101 into the small valve seat 120, aligning the assembly composed of the assembly and the small valve seat 120 with the opening of the chamber of the large valve seat 110, applying pressure toward the large valve seat 110 to the small valve seat 120, and pressing the small valve seat 120 and the guide sleeve 300 into the chamber of the large valve seat 110, where The end face of the guide sleeve 300 abuts against the limiting step 111 inside the large valve seat 110, the outer wall of the guide sleeve 300 and the inner wall of the large valve seat 110 are interference-fitted, an annular assembly groove is formed between the guide sleeve 300 and the large valve seat 110, a part of the small valve seat 120 is inserted into the annular assembly groove, the inner wall of the large valve seat 110 and the outer wall of the small valve seat 120 are interference-fitted, and the outer wall of the guide sleeve 300 and the inner wall of the small valve seat 120 are interference-fitted. This assembly method ensures a secure connection and high coaxiality between the three components: 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 pushed together into the large valve seat 110, eliminating the need to press and install them separately. Assembly can be completed in a single press and install operation, eliminating the need for two press and install operations and improving operational efficiency.

[0070] In this application, the screw assembly 500 includes a screw 510, an assembly sleeve 520, a bearing 530, a bush 540, and a small elastic member 550, and the assembly method further includes pushing 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 to the inner ring of the bearing 530, pressing and mounting the bearing 530 into the assembly sleeve 520, placing the bush 540 into the assembly sleeve 520 and bringing it into contact with the outer ring of the bearing 530, and fitting the small elastic member 550 into the bush 540, thereby ensuring a secure connection of each component of the screw assembly 500.

[0071] Furthermore, the electronic expansion valve further includes a nut assembly 400 and a valve pipe 600, and the assembly method further includes screwing the nut assembly 400 onto the screw assembly 500 and fixing the nut assembly 400 to the valve seat portion 100, and fitting the valve pipe 600 onto the nut assembly 400 and fixing the valve pipe 600 to the valve seat portion 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. Employing a welding method to connect the fitted parts further improves reliability and ensures the long-term use of the electronic expansion valve. The welding method may be laser welding or brazing, etc.

[0072] By employing the above assembly method to assemble multiple components in an electronic expansion valve, operational efficiency is high, assembly accuracy is high, the process is easy to implement, and manufacturing costs are low.

[0073] The foregoing describes only preferred embodiments of the present invention and is not intended to limit it. Those skilled in the art will know that the present invention can be modified and altered in various ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A valve seat portion (100) having a valve chamber and a valve port (101), A spindle portion (200) provided within the valve chamber includes 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 the position where the outer surface of the soft seal member (220) and the inner surface of the valve port (101) come into contact, and the soft seal member (220) is located outside the area surrounded by the annular sealing ring, at least a portion of which is located outside the area surrounded by the annular sealing ring. An electronic expansion valve further comprising a guide sleeve (300) located within the valve chamber, the large spindle (230) passing through the guide sleeve (300), the large spindle (230) reciprocating along the guide sleeve (300) and being sealed with the guide sleeve (300), the dimensions of the annular sealing ring being equal to the inner diameter of the guide sleeve (300), wherein the outer diameter of the soft sealing member (220) is greater than the outer diameter of the structure in which the large spindle (230) is located within the guide sleeve (300).

2. 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 opening (101), and the radial dimension of the position limiting segment (231) is greater 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), The 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) penetrates the guide sleeve (300) and is movably sealed and 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), 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 1, wherein the inner wall of the guide sleeve (300) has an inner sealing groove, the inner sealing ring (240) is attached to the inner sealing groove, and the diameter of the annular sealing ring is equal to the inner diameter of the inner sealing ring (240).

3. A valve seat portion (100) having a valve chamber and a valve port (101), A spindle portion (200) provided within the valve chamber includes 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 the position where the outer surface of the soft seal member (220) and the inner surface of the valve port (101) come into contact, and the soft seal member (220) is located outside the area surrounded by the annular sealing ring, at least a portion of which is located outside the area surrounded by the annular sealing ring. An electronic expansion valve 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, the small spindle (210) being 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 the end face of the small spindle (210) and the end face of the guide segment (232).

4. A valve seat portion (100) having a valve chamber and a valve port (101), A spindle portion (200) provided within the valve chamber includes 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 the position where the outer surface of the soft seal member (220) and the inner surface of the valve port (101) come into contact, and the soft seal member (220) is located outside the area surrounded by the annular sealing ring, at least a portion of which is located outside the area surrounded by the annular sealing ring. An electronic expansion valve wherein the spindle portion (200) further includes a small spindle (210), the maximum radial dimension of the soft seal member (220) is greater 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).

5. The electronic expansion valve according to claim 4, wherein the soft seal member (220) has a sealing chamfered surface (221), the sealing chamfered surface (221) is used to open and close the valve port (101), the small spindle (210) includes an adjustment segment (211), the adjustment segment (211) is inserted into the valve port (101), and the adjustment segment (211) includes a first tapered segment (215).

6. The inner circumferential surface of the valve opening (101) is cylindrical, the adjustment segment (211) further includes a cylindrical segment (214), the cylindrical segment (214) abuts against the soft seal member (220), and the larger diameter end of the first tapered segment (215) is connected to the cylindrical segment (214), where there is a gap between the cylindrical segment (214) and the inner circumferential surface of the valve opening (101). The adjustment 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), The electronic expansion valve according to claim 5, wherein the taper angle of the second tapered segment (216) is greater than the taper angle of the first tapered segment (215).

7. The electronic expansion valve according to claim 5, wherein the small spindle (210) further includes an assembly segment (212) connected to the adjustment segment (211), the radial dimension of the assembly segment (212) is smaller than the radial dimension of the adjustment segment (211), the soft seal member (220) is fitted to the assembly segment (212), a portion of the assembly segment (212) penetrates into the large spindle (230), one end of the soft seal member (220) abuts against the end face of the adjustment segment (211), and the other end of the soft seal member (220) abuts against the end face of the large spindle (230).

8. A valve seat portion (100) having a valve chamber and a valve port (101), A spindle portion (200) provided within the valve chamber includes 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 the position where the outer surface of the soft seal member (220) and the inner surface of the valve port (101) come into contact, and the soft seal member (220) is located outside the area surrounded by the annular sealing ring, at least a portion of which is located outside the area surrounded by the annular sealing ring. The present invention 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 screwed into 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), thereby applying a force toward the valve opening (101) to the spindle portion (200). The aforementioned high-elasticity member (250) is a spring, and the aforementioned high-elasticity member (250) is fitted into 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). An electronic expansion valve 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).

9. A valve seat portion (100) having a valve chamber and a valve port (101), A spindle portion (200) provided within the valve chamber includes 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 the position where the outer surface of the soft seal member (220) and the inner surface of the valve port (101) come into contact, and the soft seal member (220) is located outside the area surrounded by the annular sealing ring, at least a portion of which is located outside the area surrounded by the annular sealing ring. The present invention further includes a screw assembly (500), the screw assembly (500) being engaged with the spindle portion (200) to drive the spindle portion (200) to reciprocate, An electronic expansion valve wherein the valve seat portion (100) has a valve seat ring (103), the screw assembly (500) penetrates the valve seat ring (103), and there is a flow gap (105) between the outer wall of the screw assembly (500) and the inner wall of the valve seat ring (103).

10. The spindle portion (200) has a flow passage, one end of the flow passage is in communication with the valve port (101), the other end of the flow passage is in communication with the 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 in communication with the flow gap (105) via the first communication hole (501). The electronic expansion valve according to claim 9, further comprising a nut assembly (400) and a valve pipe (600), wherein the nut assembly (400) is fixedly connected to the valve seat portion (100), the screw assembly (500) is screwed into the nut assembly (400), the valve pipe (600) is fixedly connected to the valve seat portion (100), the nut assembly (400) is located within the chamber of the valve pipe (600), the flow gap (105) communicates with the chamber within the valve pipe (600), thereof the side wall of the nut assembly (400) has a second communication hole (401), the second communication hole (401) communicates with the chamber inside the nut assembly (400) and with the region outside the nut assembly (400), and the flow gap (105) communicates with the chamber inside the nut assembly (400).

11. The electronic expansion valve according to claim 9, 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), the small spindle (210) has a first passage (217) provided in the axial direction, the large spindle (230) has a second passage (234) provided in the axial direction, the first passage (217) communicates with the second passage (234), the first passage (217) communicates with the valve port (101), and the second passage (234) communicates with the chamber in the screw assembly (500).

12. A valve seat portion (100) having a valve chamber and a valve port (101), A spindle portion (200) provided within the valve chamber includes 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 the position where the outer surface of the soft seal member (220) and the inner surface of the valve port (101) come into contact, and the soft seal member (220) is located outside the area surrounded by the annular sealing ring, at least a portion of which is located outside the area surrounded by the annular sealing ring. The assembly further includes a screw assembly (500), which is engaged with the spindle portion (200) to drive the spindle portion (200) to reciprocate, and the screw assembly (500) includes a screw (510), an assembly sleeve (520), a bearing (530), a bush (540), and a small elastic member (550), the screw (510) being connected to the inner ring of the bearing (530), and the outer ring of the bearing (530) being connected to the assembly The bush (540) is located within the vertical sleeve (520) and is restrictedly engaged with the assembly sleeve (520), the bush (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 bush (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). An electronic expansion valve, wherein one end of the bush (540) facing the valve port (101) has a solid structure.

13. The valve seat portion (100) includes a large valve seat (110), the large valve seat (110) has a limiting step (111), the end face of the guide sleeve (300) abuts against the limiting step (111), and the outer wall of the guide sleeve (300) and the 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 opening (101). The electronic expansion valve according to claim 1, wherein an annular assembly groove is provided between the guide sleeve (300) and the large valve seat (110), a portion of the small valve seat (120) is inserted into the annular assembly groove, the inner wall of the large valve seat (110) and the outer wall of the small valve seat (120) are interference-fitted, and the outer wall of the guide sleeve (300) and the inner wall of the small valve seat (120) are interference-fitted.

14. The guide sleeve (300) includes a first sleeve segment (310) and a second sleeve segment (320) connected to each other, wherein 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 restrictedly engaged, the annular assembly groove is provided between the second sleeve segment (320) and the inner wall of the large valve seat (110), and the end face of the small valve seat (120) abuts against the end face of the first sleeve segment (310). The electronic expansion valve according to claim 13, wherein the outer wall of one end of the guide sleeve (300) facing the valve port (101) has a chamfer, and the outer wall and inner wall of the end of the small valve seat (120) away from the valve port (101) both have chamfers.

15. A method for assembling an electronic expansion valve according to claim 1, 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).

16. The electronic expansion valve further includes a small spindle (210), and the assembly method includes passing the large spindle (230) through the guide sleeve (300), fitting the soft seal member (220) onto the small spindle (210), and mounting one end of the small spindle (210) with the soft seal member (220) fitted onto it into the large spindle (230), Alternatively, the assembly method according to claim 15, wherein the electronic expansion valve further includes a small spindle (210), and the assembly method includes passing the large spindle (230) through the guide sleeve (300), fitting the soft seal member (220) onto the mounting segment (235) of the large spindle (230), and fitting the small spindle (210) onto the mounting segment (235) of the large spindle (230).

17. The electronic expansion valve further includes a screw assembly (500), and the assembly method further includes fixing the end of the large spindle (230) away from the valve port (101) to the screw assembly (500). The assembly method according to claim 16, wherein 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).

18. 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 opening (101), and mounting the assembly into the valve seat portion (100) involves inserting the small spindle (210) of the assembly into the small valve seat (120) and pre-inserting one end of the guide sleeve (300) toward the valve opening (101) into the small valve seat (120), and the assembly composed of the assembly and the small valve seat (120) and the large valve seat (110) The assembly method according to claim 17, comprising: aligning the opening of the chamber with the chamber opening and pressing the small valve seat (120) and the guide sleeve (300) into the chamber of the large valve seat (110), wherein the 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 part of the small valve seat (120) is inserted into the annular assembly groove, and the small valve seat (120) and the large valve seat (110) are welded together.

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