Electronic expansion valve

Abstract

An electronic expansion valve comprises a valve seat, a valve body component, and a valve core, the valve body component comprises a valve body, the valve body is fixedly connected with the valve seat; the valve seat comprises a valve port part, the electronic expansion valve comprises a first valve cavity and a second valve cavity, the first valve cavity is located on the side opposite to the upper side of the valve port part, and the second valve cavity is located on the side opposite to the lower side of the valve port part; the electronic expansion valve has a first interface and a second interface, the pass diameter of the valve port is smaller than the pass diameter of the second interface, and the pass diameter of the second interface is smaller than the pass diameter of the second valve cavity; the valve port part comprises a fitting part and a flared part, the fitting part is closer to the first valve cavity than the flared part, the flared part is closer to the second valve cavity than the fitting part, the height h1 of the fitting part is smaller than the height h2 of the flared part, the value of h1 satisfies 0.15 mm≤h1≤0.45 mm, and the inner diameter of the flared part on the side close to the first valve cavity is smaller than the inner diameter of the flared part on the side close to the second valve cavity.

Description

[Technical Field]

[0001] This application relates to the field of refrigeration control technology, and in particular to electronic expansion valves. [Background Technology]

[0002] A refrigeration system includes a compressor, a throttling element, two heat exchangers, and other components. The throttling element can be an electronic expansion valve, used for regulating the flow of refrigerant. Using an electronic expansion valve allows for relatively precise control, thus improving system energy efficiency. An electronic expansion valve generally includes a first port and a second port. Refrigerant can flow in from the first port and out from the second port, or vice versa. When refrigerant passes through the electronic expansion valve, some noise may be generated. Improving the noise level of refrigerant passing through the electronic expansion valve has been a long-standing research topic for those skilled in the art of electronic expansion valves and refrigeration systems. Those in the know have continuously made various attempts to improve the noise problem of electronic expansion valves. [Summary of the Invention]

[0003] The purpose of this invention is to provide an electronic expansion valve to improve the noise problem of refrigerant flowing through the electronic expansion valve.

[0004] To achieve the above objectives, one embodiment of the present invention adopts the following technical solution:

[0005] An electronic expansion valve includes a valve seat, a valve body component, and a valve core. The valve body component includes a valve body, which is fixedly connected to the valve seat. The valve seat includes a valve port. The electronic expansion valve includes a first valve chamber and a second valve chamber. The first valve chamber is located on a side opposite to the valve port, and the second valve chamber is located on a side opposite to the valve port. The electronic expansion valve has a valve port on the valve port, which connects the first valve chamber and the second valve chamber. The electronic expansion valve has a first interface and a second interface, where the first interface communicates with the first valve chamber, and the second interface communicates with the second valve chamber. The valve core is at least partially located in the first valve chamber, and the valve core cooperates with the valve port to adjust the flow area of ​​the electronic expansion valve. The diameter of the valve port is smaller than the diameter of the second interface, and the diameter of the second interface is smaller than the diameter of the second valve chamber. The valve port includes a mating part and a flared part. The mating part is closer to the first valve cavity than the flared part, and the flared part is closer to the second valve cavity than the mating part. The height h1 of the mating part is less than the height h2 of the flared part, and the value of h1 satisfies: 0.15mm ≤ h1 ≤ 0.45mm. The inner diameter of the end of the flared part closer to the first valve cavity is less than the inner diameter of the end of the flared part closer to the second valve cavity.

[0006] The above technical solution provides two valve chambers in the electronic expansion valve, located on both sides of the valve port. The first valve chamber and the second valve chamber can be connected through the valve port. When the refrigerant is throttled in the first flow direction, the throttled refrigerant flows out into the second valve chamber. The second valve chamber has a relatively large space, and the valve port includes a mating part and a flared part to change the flow space of the refrigerant, thereby improving the flow noise of the refrigerant. [Attached Image Description]

[0007] Figure 1 This application provides a schematic diagram of the structure of an electronic expansion valve according to a first embodiment;

[0008] Figure 2 for Figure 1 An enlarged schematic diagram of part I of the electronic expansion valve shown;

[0009] Figure 3 for Figure 1 The diagram shows a partial cross-sectional view of the electronic expansion valve, including the valve seat and valve body components.

[0010] Figure 4 This is a cross-sectional view of the valve seat;

[0011] Figure 5 for Figure 4 Enlarged schematic diagram of Part II;

[0012] Figure 6 This is a schematic diagram of another embodiment of the valve seat structure of this application;

[0013] Figure 7 This application provides a schematic diagram of the electronic expansion valve structure according to a second embodiment;

[0014] Figure 8 This is a cross-sectional schematic diagram of the valve seat component according to the second embodiment;

[0015] Figure 9 for Figure 8 Enlarged schematic diagram of Part III;

[0016] Figure 10 This is a schematic diagram of another embodiment of the valve seat structure of this application.

[0017] Figure 11 This application provides a schematic diagram of the electronic expansion valve structure according to a third embodiment;

[0018] Figure 12 for Figure 11 Enlarged schematic diagram of Part IV;

[0019] Figure 13 This is a schematic diagram of the electronic expansion valve seat structure in the fourth embodiment;

[0020] Figure 14This is a partial cross-sectional view of another embodiment of the valve seat structure of this application.

[0021] Figure 15 This is a partial cross-sectional view of another embodiment of the valve seat structure of this application.

Detailed Implementation Methods

[0022] To enable those skilled in the art to better understand the technical solutions provided in this application, the technical solutions of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] First Implementation Method

[0024] Please refer to Figures 1-4 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the electronic expansion valve. Figure 2 This is a magnified view of a portion of the image. Figure 3 yes Figure 1 A partial cross-sectional view of the electronic expansion valve, mainly including the valve seat and valve body components, which clearly shows the structure of the valve port. Figure 4 This is a cross-sectional view of the valve seat component.

[0025] It should be noted that the following technical solutions describe a specific electronic expansion valve structure. This application mainly improves refrigerant flow noise by modifying the flow channel structure, specifically by improving the structure of the valve chamber and valve port. Other components of the electronic expansion valve, such as the magnetic rotor assembly, nut assembly, and stop device, are not limited here. The technical solutions of this application do not particularly limit the structure of these components. Those skilled in the art can apply the technical solutions disclosed herein to all similar electronic expansion valve structures. The descriptions of the aforementioned magnetic rotor assembly, lead screw valve core assembly, and other components are only for understanding the basic working principle of the electronic expansion valve and are not intended to impose structural limitations.

[0026] The electronic expansion valve includes a valve seat 11, a valve body component 14, and also includes a connector 15, a sleeve 16, a magnetic rotor assembly 17, a lead screw valve core assembly 18, and a nut assembly 19. The valve body component 14 includes a valve body 141. The valve seat 11 and the valve body 141 are fixedly connected by welding. Simultaneously, the valve seat 11 is fixedly connected to a first connecting pipe 121, and the valve body component 14 is fixedly connected to a second connecting pipe 122. Figure 1As shown, a connector 15 is provided on one side above the valve seat 11. The connector 15 is roughly cup-shaped with an open bottom. The connector 15 is fixedly connected to the valve seat 11 and also fixedly connected to the sleeve 16. That is, the valve seat is connected to the sleeve through the connector. Specifically, a step can be provided on the upper side of the valve seat 11, and the bottom opening of the connector 15 can be matched with the step and the two can be welded together for fixation. Alternatively, other methods can be used to fix the two relative to each other first, such as snap-fitting and then welding.

[0027] On the upper side of the connector 15, a sleeve 16 is also provided. The sleeve 16 and the connector 15 can be fixed by welding. In this way, the sleeve 16, the connector 15, and the valve seat 11 are fixedly connected. The space within the three is provided with the magnetic rotor assembly 17, the lead screw valve core assembly 18, and the nut assembly 19. It is worth noting that in the above structure, the connector 15 is not necessary. When the connector 15 is not present, the sleeve 16 can be directly fixed to the valve seat 11, or other components can be used for fixing, such as extending the outer edge of the valve seat 11 upward and welding it to the sleeve 16.

[0028] The magnetic rotor assembly 17 rotates in response to the electromagnetic force of the electromagnetic coil. The magnetic rotor assembly 17 includes a magnetic rotor 171 and a connecting plate 172 fixedly connected to or integrally formed with the magnetic rotor 171. Specifically, the connecting plate 172 can be used as an insert, and the magnetic rotor 171 can be injection molded. The lead screw valve core assembly 18 includes a lead screw 181, which is fixedly connected to the connecting plate 172. Thus, the lead screw 181 is connected to the magnetic rotor assembly 17 as a whole through the connecting plate 172. Specifically, the lead screw 181 and the connecting plate 172 can be fixedly connected by welding or by other fixed or limiting connection methods such as snap-fit ​​or crimping. The stop rod 173 is fixedly connected to the magnetic rotor assembly 17 and is generally located within the area roughly enclosed by the magnetic rotor 171.

[0029] The lead screw valve needle assembly 18 includes a lead screw 181, a valve core 182, a valve core sleeve 183, a spring 184, a washer portion 185, a retaining ring portion 186, and a bushing component 187. The lead screw 181 and the valve core 182 are floatingly connected via the valve core sleeve 183. The valve core sleeve 183 and the valve core 182 can be fixedly connected by welding. The bottom end of the lead screw 181 is fixedly connected to the bushing component 187, and the two can be fixedly connected by welding. At least a portion of the valve core 182 is located in the first valve chamber A (see below). When the electronic expansion valve is operating, the valve core 182 can move a certain stroke relative to the valve port under actuation, thereby cooperating with the valve port 1121 to regulate the flow rate. That is, during the operation of the electronic expansion valve, the valve core 182 can move up and down relative to the valve port 112 within a certain stroke to adjust the opening degree of the valve port 1121. A retaining ring portion 186 and a washer portion 185 are provided on the upper end face of the valve core sleeve 183. In this embodiment, the retaining ring portion 186 is not limited to the C-shaped open retaining ring shown in the figure, and other open retaining rings of other shapes can also be used instead. Similarly, the washer portion 185 in this embodiment is not limited to the annular washer shown in the figure, and other retaining rings that can play the same role can also be used instead, such as open retaining rings. The spring 184 is sleeved on the lead screw 181. Specifically, one end of the spring 184 abuts against the upper flange portion 1811 of the lead screw, and the other end of the spring 184 abuts against the washer portion 185. Under the action of the spring 184, the washer portion 13 abuts against the lower flange portion 1812. It is worth noting that one end of spring 14 abuts against the upper flange 1811, including one end of spring 184 directly abutting against the upper flange 1551, and also including one end of spring 184 indirectly abutting against the upper flange 1551, for example, by providing a retaining ring or other components between spring 184 and the upper flange 1551. The maximum outer diameter of the bushing component 187 is larger than the minimum inner diameter of the central through hole of the valve core sleeve 183. Thus, after assembly, the valve core 182 and the lead screw 181 cannot be disengaged. Due to the action of spring 184, when the valve core 182 abuts against the valve port, the valve core 182 and the lead screw 181 can perform a certain stroke of relative movement. The disengagement mentioned in this article refers to the separation of the sleeve portion 183 and the lead screw 181 into two separate components without any restriction between them, and not merely to the absence of physical contact between them.

[0030] The nut assembly 19 includes a nut 191 and a connecting piece 192. The nut 191 and the connecting piece 192 are fixedly connected. The connecting piece 192 can be formed by stamping a metal sheet. The nut 191 is fixedly installed to the sleeve 16 and / or the connector 15 through the metal connecting piece 192. The nut 191 can be made of non-metallic material and injection molded with the connecting piece 192 as an insert. The connecting piece 192 and the connector 15 can be fixedly connected by welding. When the connector is not provided, the connecting piece 192 can be fixedly connected to the valve seat 11 or the sleeve by welding.

[0031] Nut 191 has a through hole extending along its axial direction. The nut has an internal thread on the inner side wall where the through hole is located. Correspondingly, the outer circumferential surface of the lead screw 181 has a corresponding external thread. When the magnetic rotor assembly 17 rotates, the lead screw 181 rotates and moves up and down relative to the nut assembly 19 under the action of the thread pair, thereby driving the valve core 182 to move up and down within a certain range.

[0032] A spring guide rail 1911 is provided on the outer edge of a portion of the nut 191. The spring guide rail 1911 is fixedly connected to or limited to the nut 191, so that the spring guide rail 1911 and the nut 191 are relatively positioned in both the axial and circumferential directions. The stop rod 173 rotates with the magnetic rotor assembly and drives the slip ring 1912 to slide helically along the spring guide rail 1911. The nut assembly is provided with an upper stop part and a lower stop part. The slip ring 1912 can stop rotating by abutting against the upper stop part, and at the same time, the slip ring 1912 can stop rotating by abutting against the lower stop part.

[0033] The electronic expansion valve includes a guide portion 20, which is generally cylindrical. In this embodiment, a first outer edge portion 201 and a second outer edge portion 202 are provided on its outer periphery. The outer diameter of the first outer edge portion 201 is smaller than the outer diameter of the second outer edge portion 202. Furthermore, the outer diameter of the first outer edge portion 201 is adapted to the inner hole of the lower end of the nut 191. Thus, during assembly, the nut 191 is fitted onto the upper end of the guide portion 20, and the first outer edge portion 201 can guide the assembly of the nut. The outer diameter of the second outer edge portion 202 is adapted to the inner diameter of a portion of the inner wall of the valve seat 11, and can guide the assembly. Specifically, the guide portion 20 can be fixedly connected to the valve seat 11 by means of interference fit or welding. Of course, those skilled in the art will understand that the outer diameter of the first outer edge portion 201 shown in this embodiment is smaller than the outer diameter of the second outer edge portion 202, which is determined based on the design that the inner diameter of the valve seat inner hole is smaller than the inner diameter of the inner hole at the lower end of the nut. As an equivalent alternative, the inner diameter of the valve seat inner hole can also be set to be larger than the inner diameter of the inner hole at the lower end of the nut, or the inner diameters of the two can be set to be the same or approximately the same. The guide portion 20 is also provided with a valve core guide portion 203. The valve core guide portion 203 matches the outer diameter of the valve core 182, so that the outer edge surface of the valve core 182 can move along the valve core guide portion 203. In this way, when the valve core moves, the valve core guide portion 203 can provide good guidance and radial support for the valve core, which can relatively reduce abnormal wear at the valve port caused by the swing of the valve core. It should be noted that the first outer edge portion 201, the second outer edge portion 202, and the valve core guide portion 203 mentioned above are all disposed in a certain area or part on the surface of the guide portion 20. This area or part can realize the corresponding guiding function and is not a limitation on the shape of the guide portion 20. In fact, the guide portion 20 can be adapted to various sizes of nuts, valve seats, and shapes. As long as it includes the first outer edge portion 201 that can guide the nut, the second outer edge portion 202 that can guide the valve seat, and the valve core guide portion 203 that can guide the valve core, it belongs to the guide portion described in the embodiments of the present invention.

[0034] At least a portion of the guide portion 20 is located in the first valve chamber A. In addition to guiding the valve core, the guide portion changes the shape of the first valve chamber A at its lower end, which can have a certain influence on the fluid flowing into the first valve chamber A and help to further reduce the noise of fluid flow.

[0035] The electronic expansion valve includes a valve seat 11, a valve body component 14, a first connecting pipe 121, and a second connecting pipe 122. The valve seat 11, valve body component 14, first connecting pipe 121, and second connecting pipe 122 are fixedly connected by welding. Specifically, the valve seat 11 is fixedly connected to the valve body 141 by welding, the valve seat 11 is fixedly connected to the first connecting pipe 121 by welding, and the valve body 141 is fixedly connected to the second connecting pipe 122 by welding. The valve seat 11 has a valve port portion 112, and a valve port 1121 is provided in the valve port portion 112. The electronic expansion valve has a first valve chamber A and a second valve chamber B. In this application, the valve chamber above the valve port portion 112 and connected to the first interface 1211 of the first connecting pipe 121 is the first valve chamber A, and the valve chamber below the valve seat and connected to the second interface 1221 of the second connecting pipe 122 is the second valve chamber B. The first valve chamber A and the second valve chamber B can be connected through the valve port 1121. The first valve chamber A is located on the upper side of the valve port portion 112, and the second valve chamber B is located on the lower side of the valve port portion 112. The through diameter D of the valve port 1121 is smaller than the through diameter H2 of the second interface 1221, the through diameter H2 of the second interface 1221 is smaller than the through diameter H1 of the second valve chamber B, and the through diameter H3 of the first interface 1211 is smaller than the through diameter H1 of the second valve chamber B. In this embodiment, the second valve chamber B is not limited to having the same diameter. If the diameters are different, the diameter H1 of the second valve chamber B refers to the diameter at the relatively largest point. In this embodiment, the diameter H1 of the second valve chamber B, the diameter H3 of the first interface 1211, and the diameter H2 of the second interface 1221 satisfy the following conditions: H1 ≥ 1.3H3, H1 ≥ 1.3H2.

[0036] In addition, the valve body 141 is provided with an inwardly flanged portion 1412 on its side wall 1411 to facilitate connection with the second connecting pipe 122. The valve body 141 can be made of stainless steel, such as stainless steel sheet or pipe formed by stretching, stamping or extrusion.

[0037] Some systems may require electronic expansion valves that allow bidirectional flow. In this paper, the flow of refrigerant from the first interface to the second interface is defined as the first flow direction, and the flow of refrigerant from the second interface to the first interface is defined as the second flow direction. Alternatively, the flow of refrigerant from the first pipe through the first valve chamber, valve port, and second valve chamber to the second pipe is defined as the first flow direction, and the flow of refrigerant from the second pipe through the second valve chamber, valve port, and first valve chamber to the first pipe is defined as the second flow direction.

[0038] In this embodiment, the valve port 112 includes a mating portion 1123 and a flared portion 1124. The mating portion 1123 can mate with the valve needle and change the flow area of ​​the electronic expansion valve as the valve needle moves up and down. The mating portion 1123 can be a straight section, meaning that the inner diameter of the mating portion 1123 remains constant along the central axis, which facilitates processing. Of course, it is also permissible for the mating portion 1123 to be a frustum-shaped section with the inner diameter gradually increasing or decreasing from top to bottom, but generally the cone angle does not exceed 5°, meaning the mating portion 1123 is closer to a straight section. The mating portion 1123 is closer to the first valve cavity A than the flared portion 1124, and the flared portion 1124 is located below the mating portion 1123. The mating portion 1123 and the flared portion 1124 are continuously arranged. Figure 5 , Figure 5 This is a cross-sectional view of the valve port portion 112 according to this embodiment. Extending from top to bottom along the central axis, with the top of the valve port portion remaining flat, the thickness of the valve port portion 112 gradually increases radially outward from the bottom of the mating portion 1123. That is, the wall thickness of the valve port portion 112 is relatively thinnest at the mating portion 1123, and gradually increases along the downward extending direction of the flared portion 1124. Thus, the inner diameter of the flared portion 1124 near the end closest to the first valve chamber A is smaller than the inner diameter of the flared portion 1124 near the end closest to the second valve chamber B.

[0039] Let the height of the mating part 1123 be h1, and the height of the flared part 1124 be h2. The wall thickness of the valve port 112 in the mating part mentioned above can also be understood as the height of the mating part 1123, and the wall thickness of the valve port 112 in the flared part can also be understood as the height of the flared part 1124. Thus, h1 < h2. It should be noted that the "flaring" mentioned in this specification refers to the diameter of the valve port. Along the central axis of the valve port, the diameter of the valve port gradually increases. It should be noted that the gradually increasing trend mentioned here means that, in terms of the overall inner diameter of the valve port, the inner diameter near the second valve cavity B is generally larger than the inner diameter near the first valve cavity A. However, along the top-to-bottom direction, it is permissible for the inner diameter to decrease in a certain section, such as by providing a groove facing the inner wall of the valve port. The value of h1 can be between 0.15mm and 0.45mm, or even between 0.25mm and 0.35mm; the value of h2 can be between 2.5mm and 4.5mm, or even between 3.0mm and 4mm. The flared part 1124 is... Figure 5As shown in the longitudinal section, it is roughly trumpet-shaped. Along the longitudinal section passing through the central axis, the inner wall of the flared portion 1124 has two contour lines. These two contour lines are straight lines. The highest point of one inner wall contour line is defined as X2, and the lowest point as X3. The highest point of the other inner wall contour line is defined as Y2, and the lowest point as Y3. The lines connecting X2 and X3, and Y2 and Y3, have an angle α between them, with α ranging from 40° to 80°. Thus, when the refrigerant flows in the first flow direction, it passes through the mating part 1123 and the trumpet-shaped flared portion 1124, which facilitates the diffusion of the refrigerant to the surrounding area, thereby reducing the noise of the refrigerant flowing in the first flow direction. That is, the channel space of the electronic expansion valve in the valve port 112 includes the space formed by the mating part 1123 and the valve core, and the space formed by the flared portion 1124 and the valve core. When the refrigerant flows in the first flow direction, it first flows through the valve port 1121, then through the flared portion 1124, and then enters the second valve chamber B.

[0040] In this embodiment, the valve port 112 also includes a protrusion 1128 located below the flared portion 1124 and a tail portion 1129 located at the bottom of the entire valve port 112. Based on the frustoconical inner wall of the flared portion 1124, the protrusion 1128 protrudes towards the central axis. The tail portion 1129 can be configured to extend substantially in the same direction as the flared portion 1124; in other words, it can be understood that the tail portion 1129 is an extension of the flared portion 1124, while the protrusion 1128 is located on the inner wall of the extended flared portion and protrudes towards the central axis. Of course, in Figure 2 On the cross section shown, the tail portion 1129 is not necessarily set to have the same included angle value as the flared portion 1124. According to the applicant's test, the angle of the extension line of the tail portion 1129 on the cross section is between 40° and 80°, which can still ensure a good noise control effect.

[0041] It should be noted that when the value of h2 is between 2.5mm and 4.5mm, and the value of α is between 40° and 80°, there will inevitably be requirements on the diameter of the valve port 112 (or it can be roughly understood as the through diameter of the second valve chamber B). However, commercially available electronic expansion valves do not have a second valve chamber; they only have a common connecting pipe (the inner diameter of which usually does not exceed 8mm) connected to the valve port. Therefore, due to the inner diameter of the connecting pipe, it is impossible to simultaneously meet the above-mentioned values ​​of h2 and α. In this embodiment, the through diameter of the second valve chamber H1, which is roughly defined by the valve body, is between 9mm and 30mm, or even between 11mm and 14mm. Based on this, the above-mentioned values ​​of h2 and α can be easily achieved.

[0042] The valve port structure provided in this embodiment can reduce noise to a certain extent, especially the noise test results in the first flow direction are relatively good, and even better than the noise test results in the second flow direction.

[0043] As a partial structural change to the first embodiment described above, the outline shape of the flared portion 1124 can be altered. Please refer to [reference needed]. Figure 6 , Figure 6 This is a schematic diagram of another valve seat structure in this application. In this extended embodiment, the flared portion 1124 is no longer a standard conical shape, and its shape in the longitudinal section is not straight. Figure 12 As shown, limited by the height of the flared portion 1124, in the longitudinal section passing through the central axis of the valve seat, the flared portion 1124 has two inner wall contour lines, and the two contour lines are curved. Figure 6 This is an example of one type of curve; in practice, various different curve shapes, combinations of multiple curve shapes, combinations of curves and straight lines, etc., can be used. Let X2 be the intersection point of one inner wall contour line and the mating part 1123, and X3 be the lowest point. Let Y2 be the intersection point of another inner wall contour line and the mating part 1123, and Y3 be the lowest point. Then, there exists at least one cross-section Q1. This cross-section Q1 intersects the two inner wall contour lines of the flared part 1124 at points X1 and Y1 respectively. Connecting X1 and X2 yields a straight line, and connecting Y1 and Y2 yields another straight line. The two straight lines have an angle θ, which satisfies the condition: 40°≤θ1≤80°. The vertical height h4 from X1 to X2 satisfies: h4≥2.5mm. This valve seat structure, when applied to the first embodiment, can also meet the noise requirements of the electronic expansion valve.

[0044] Second Implementation Method

[0045] The following is the conclusion Figures 7-10 The second embodiment of the present invention will be described below.

[0046] Please refer to Figures 7-10 ,in, Figure 7 This application provides a schematic diagram of the electronic expansion valve structure according to a second embodiment; Figure 8 This is a cross-sectional schematic diagram of the valve seat component according to the second embodiment; Figure 9 for Figure 8 Enlarged schematic diagram of Part III, Figure 10 This is a partial cross-sectional schematic diagram of another type of valve seat component.

[0047] To facilitate the description of this embodiment, and especially to highlight the differences between this embodiment and the first embodiment, components that have the same structure and function as those in the first embodiment are referred to by the same reference numerals and are described briefly, with emphasis on a detailed description of the differences between the two.

[0048] Similar to the first embodiment, the technical solution of this embodiment improves the structure of the valve chamber and valve port to reduce noise. Other components of the electronic expansion valve, such as the magnetic rotor assembly, nut assembly, and stop device, are not limited here. The technical solution of this application does not particularly limit the structure of the above components. Those skilled in the art can apply the technical solution disclosed herein to all similar electronic expansion valve structures.

[0049] In this embodiment, the magnetic rotor assembly 17, the lead screw valve needle assembly 18, the connector 15, the sleeve 16, the valve body component 14, the nut assembly 19, and the guide part 20 can all adopt the same structure as in the first embodiment, and will not be described again here.

[0050] The electronic expansion valve includes a valve seat 11a, a valve body component 14, a first connecting pipe 121, and a second connecting pipe 122. The valve seat 11a, the valve body component 14, the first connecting pipe 121, and the second connecting pipe 122 are fixedly connected by welding. Specifically, the valve seat 11a is fixedly connected to the valve body 141 by welding, the valve seat 11a is fixedly connected to the first connecting pipe 121 by welding, and the valve body 141 is fixedly connected to the second connecting pipe 122 by welding. The valve seat 11a has a valve port portion 112a, and a valve port 1121a is provided in the valve port portion 112a. The electronic expansion valve has a first valve chamber A and a second valve chamber B. In this application, the valve chamber above the valve port portion 112a and connected to the first interface 1211 of the first connecting pipe 121 is the first valve chamber A, and the valve chamber below the valve seat and connected to the second interface 1221 of the second connecting pipe 122 is the second valve chamber B. The first valve chamber A and the second valve chamber B can communicate through the valve port 1121a. The first valve chamber A is located on the upper side of the valve port portion 112a, and the second valve chamber B is located on the lower side of the valve port portion 112a. The through diameter D of the valve port 1121a is smaller than the through diameter H2 of the second interface 1221, the through diameter H2 of the second interface 1221 is smaller than the through diameter H1 of the second valve chamber B, and the through diameter H3 of the first interface 1211 is smaller than the through diameter H1 of the second valve chamber B. In this embodiment, the second valve chamber B is not limited to having the same diameter. If the diameters are different, the diameter H1 of the second valve chamber B refers to the diameter at the relatively largest point.

[0051] In this embodiment, the valve port 112a includes a mating portion 1123a and a flared portion 1124a. The mating portion 1123a can mate with the valve needle and change the flow area of ​​the electronic expansion valve as the valve needle moves up and down. The mating portion 1123a can be a straight section, meaning that the inner diameter of the mating portion 1123a remains constant along the central axis, which facilitates processing. Of course, it is also permissible for the mating portion 1123a to be a frustum-shaped section with the inner diameter gradually increasing or decreasing from top to bottom, but generally the cone angle does not exceed 5°, meaning the mating portion 1123 is closer to a straight section. The following description assumes that the mating portion 1123a is a straight section. Unlike the first embodiment, a transition portion 1122a is also provided above the mating portion 1123a. That is, the transition portion 1122a is located at the opposite top of the valve port 112a, and the mating portion 1123a and the flared portion 1124a are located below the transition portion 1122a in sequence. The valve seat 11a is made of a single piece of material. like Figure 8 As shown, along the downward extension direction of the central axis, the thickness of the valve port 112a gradually decreases in the transition portion 1122a, remains essentially unchanged in the mating portion 1123a, and gradually increases in the flared portion 1124a. The gradual increase in thickness here refers to the thickness of the valve port 112a increasing radially outward from the bottom of the mating portion 1123a. Let the height of the mating portion 1123a be h1, the height of the flared portion 1124a be h2, and the height of the transition portion 1122a be h3. The thickness of the valve port 112a in the transition portion 1122a can also be understood as the height of the transition portion 1122a, the thickness of the valve port 112a in the mating portion 1123a can also be understood as the height of the mating portion 1123a, and the thickness of the valve port 112a in the flared portion 1124a can also be understood as the height of the flared portion 1124a. And the condition: h3 < h1 < h2 is satisfied. The term "flare" as used in this specification refers to the diameter of the valve port. Along the central axis of the valve port, starting from the bottom of the mating part 1123a, the diameter of the valve port gradually increases. This gradual increase means that, generally speaking, the inner diameter of the valve port is larger near the second valve chamber B than near the first valve chamber A. However, along the top-to-bottom direction, it is permissible for the inner diameter to decrease in a certain section, for example, by providing a groove facing the inner wall of the valve port.

[0052] The value of h1 can be between 0.15mm and 0.45mm, or even between 0.25mm and 0.35mm; the value of h2 can be between 2.5mm and 4.5mm, or even between 3.0mm and 4mm; the value of h3 can be between 0.05mm and 0.2mm, or even between 0.05mm and 0.15mm.

[0053] 1124a of the flared part Figure 9 As shown in the longitudinal section, it is roughly trumpet-shaped, and the inner wall of the flared portion 1124a forms an angle of approximately α along the extension line of this section, where α is an acute angle between 40° and 80°. The transition portion 1122a is formed by chamfering the valve port towards the first valve cavity A, and is adjacent to the first valve cavity A. Because the height of the transition portion 1122a is relatively small, its cross-sectional shape, as seen in the enlarged view, can be either straight or curved. Figure 8 Taking the longitudinal section shown as an example, the transition portion is a straight trumpet shape, and the extension line of the transition portion 1122a is approximately at an angle γ, where γ is an acute angle between 40° and 80°. Thus, when the refrigerant flows in the first flow direction, it passes sequentially through the transition portion 1122a, the mating portion 1123a, and the trumpet-shaped flared portion 1124a, which facilitates the diffusion of the refrigerant to the peripheral area, thereby reducing the noise of the refrigerant flowing in the first flow direction. Specifically, the channel space of the electronic expansion valve in the valve port 112 includes the space formed by the transition portion 1122a, the mating portion 1123a, and the valve core, as well as the space formed by the flared portion 1124 and the valve core. When the refrigerant flows in the first flow direction, it sequentially flows through the transition portion 1122a, the mating portion 1123a, and the flared portion 1124 before entering the second valve chamber B.

[0054] As a partial change from the second embodiment, the transition portion is not limited to a frustum shape; that is, the longitudinal section of the transition portion is not limited to a straight line. Please refer to... Figure 10 , Figure 10 This is a partial cross-sectional view of another valve seat structure in this embodiment. The outline of the transition part 1122a1 in the longitudinal section is curved. Since the height h5 of the transition part is only between 0.05mm and 0.2mm, changing the straight line of its longitudinal section to an arc or curved section will not affect the technical effect of this embodiment.

[0055] Similar to the first embodiment, when the value of h2 is between 2.5mm and 4.5mm and the value of α is between 40° and 80°, there will inevitably be requirements on the diameter of the valve port 112a (or roughly understood as the through diameter of the second valve chamber B). However, commercially available electronic expansion valves do not have a second valve chamber; they only connect a common connecting pipe (with an inner diameter usually not exceeding 8mm) to the valve port. Therefore, due to the limitation of the inner diameter of the connecting pipe, it is impossible to simultaneously satisfy the values ​​of h2 and α. In this embodiment, the through diameter of the second valve chamber H1, which is roughly defined by the valve body, is between 9mm and 30mm, or even between 11mm and 14mm. Based on this, the values ​​of h2 and α can be easily achieved.

[0056] The valve port structure provided in this embodiment can reduce noise to a certain extent, especially the noise test results in the second flow direction are relatively better and better than the noise test results in the first flow direction.

[0057] Third Implementation Method

[0058] The following is the conclusion Figures 11-12 The third embodiment of the present invention will be described below.

[0059] Please refer to Figure 11 , Figure 12 ,in, Figure 11 This application provides a schematic diagram of the electronic expansion valve structure according to a third embodiment; Figure 12 for Figure 11 Enlarged schematic diagram of part IV.

[0060] To facilitate the description of this embodiment, and especially to highlight the differences between this embodiment and the first embodiment, components that have the same structure and function as those in the first embodiment are referred to by the same reference numerals and are described briefly, with emphasis on a detailed description of the differences between the two.

[0061] Similar to the first embodiment, the technical solution of this embodiment improves the structure of the valve chamber and valve port to reduce noise. Other components of the electronic expansion valve, such as the magnetic rotor assembly, nut assembly, and stop device, are not limited here. The technical solution of this application does not particularly limit the structure of the above components. Those skilled in the art can apply the technical solution disclosed herein to all similar electronic expansion valve structures.

[0062] In this embodiment, the magnetic rotor assembly 17, the lead screw valve needle assembly 18, the connector 15, the sleeve 16, the valve body component 14, the nut assembly 19, and the guide part 20 can all adopt the same structure as in the first embodiment, and will not be described again here.

[0063] The valve seat 11 in this embodiment also adopts the same structure as in the first embodiment, including a valve port 112, which includes a mating portion 1123 and a flared portion 1124. The difference from the first embodiment is that this embodiment also includes a porous component 21. The porous component 21 is at least mostly located in the first valve cavity A and is in contact with or fixedly connected to the valve seat. This contact includes both direct and indirect contact; for example, adding a gasket between the porous component and the valve seat can be considered as indirect contact. The porous component 21 is open at both ends and can be formed by sintering metal spheres, such as copper spheres. This structure can withstand a certain pressure without falling off, breaking, or dispersing. Specifically, during installation, an annular mounting groove 1125 can be provided on the top of the valve port 112 of the valve seat 11, located on the outer side of the valve port. During installation, first align the annular bottom of the porous component 21 with the mounting groove 1125, and then insert the guide component 20. By setting a predetermined dimensional tolerance, the guide component 20 abuts against the porous component 21, and a certain pressure is applied to the porous component 21, thereby fixing the porous component 21 onto the valve seat 11. Of course, the abutment mentioned here also includes direct abutment or indirect abutment. For example, adding a gasket between the porous component and the guide component can be regarded as indirect abutment between the porous component and the guide component. Due to the presence of the mounting groove 1125, the porous component 21 is less likely to shift relative to the valve seat, thereby making the structure more stable. After the refrigerant flows into the first valve chamber A from the first connecting pipe, it first passes through the porous component 21, and then enters the valve port, flowing into the second valve chamber B.

[0064] As a partial alternative in this embodiment, the annular mounting groove 1125 can be omitted from the outer side of the valve port. Instead, the porous component 21 can be placed directly on top of the valve port, with the annular bottom of the cylindrical component 21 directly abutting against the top plane of the valve port. By applying a certain pressure to the porous component 21 during installation, it can be deformed to ensure that it does not loosen axially after installation. The porous component 21 can be sintered from copper spheres, which have relatively strong bonding forces and can prevent dispersion or detachment even under certain deformation. Alternatively, the porous component 21 can also be sintered from stainless steel wire, as long as it forms porous gaps that allow refrigerant to pass through.

[0065] In both of the above installation methods, after installation, the first valve chamber A is separated by the height of the porous component 21 in the axial direction. The space inside the porous component of the first valve chamber A is connected to the second valve chamber A through the valve port 1121. The space outside the porous component of the first valve chamber A is directly connected to the first interface 1211. The first interface 1211 and the second interface are connected through the porous component 21, the valve port 1121, and the second valve chamber B.

[0066] The porous component 21 is formed by winding copper balls. The refrigerant can pass through the gaps formed between the copper balls of the porous component. In order to reduce the phenomenon of the porous component being blocked when there are too many impurities, a through part 211 can be further opened on the porous component 21 to penetrate its cylindrical wall. The through part 211 connects the inner cavity space and the outer cavity space of the porous component, which can reduce the risk of the porous component being blocked by impurities. Figure 10 The diagram shown is of the through section 211, which consists of several notches at the top of the porous component. The advantage of this structure is that it can be directly formed during sintering. Those skilled in the art should understand that the specific structure of the through section is not limited to... Figure 11 As shown, it is possible to penetrate the wall of the porous component. For example, the penetration part 211 can be set at the bottom of the porous component, or a notch can be used, or even a hole can be drilled in the side wall of the porous component, etc.

[0067] The valve port structure provided in this embodiment can reduce noise to a certain extent, and the noise control effect in both the first flow direction and the second flow direction is relatively good.

[0068] The electronic expansion valve described in the above three embodiments has two valve chambers, located on both sides of the valve port. The first valve chamber and the second valve chamber can be connected through the valve port, so that when the refrigerant is throttled in the first flow direction, the refrigerant flows out into the second valve chamber after throttling. The second valve chamber has a relatively large space. Combined with the valve port or the valve port combined with the porous component, the flow mode and flow space of the refrigerant are changed, thereby improving the flow noise of the refrigerant.

[0069] The valve bodies described in the above embodiments can be formed from stainless steel through stretching or extrusion, or from sheet metal or tubing, which makes processing relatively convenient and allows the valve body wall thickness to be less than 1 mm. The "bore diameter" mentioned herein refers to a cross-section that is not limited to circular. For example, the cross-section of the valve port is not limited to circular and can include other shapes, such as the bore diameter of the second valve cavity, whose cross-section is not limited to circular. The bore diameter H2 of the second interface is greater than the bore diameter D of the valve port 1121, the bore diameter H1 of the second valve cavity B is greater than the bore diameter H2 of the second interface connected to the second connecting pipe, the bore diameter H1 of the second valve cavity B is greater than the bore diameter H3 of the first interface connected to the first connecting pipe, and the bore diameter H2 of the second interface connected to the second connecting pipe is greater than the bore diameter D of the valve port 1121. Here, the bore diameter is equivalent to the equivalent inner diameter, that is, the inner diameter value when the cross-sectional area at that location is transformed into a circle with the same cross-sectional area, or in other words, both have the same cross-sectional area, thus having the same flow area. The valve body has a bottom wall portion 1413. The distance L from the bottom wall portion 1413 to the valve port portion is more than twice the diameter H2 of the second connecting pipe 122. That is, the second valve chamber B has sufficient height to play a certain role in reducing fluid noise.

[0070] In another specific embodiment, the valve core 182 includes an adjusting portion 1821 and a pointed portion 1822, which are generally located at the bottom end of the valve core 182, with the pointed portion 1822 located below the adjusting portion 1821. The cross-sectional profile of the adjusting portion 1821 is generally a smoothly transitioning curve. When the valve core 182 is in the closed state, abutting against the valve port 112, the outer edge of the adjusting portion 1821 contacts the valve port 112. When the electronic expansion valve opens, the lead screw drives the valve core 182 upward. At this time, an annular gap is formed between the outer edge of the adjusting portion 1821 and the valve port 112 to allow refrigerant to pass through. Furthermore, as the valve core 182 gradually moves upward, the annular gap changes size due to the smoothly transitioning curve of the cross-sectional profile of the adjusting portion 1821, and the flow rate is adjusted approximately proportionally, which is different from the linear adjustment state of the frustum-shaped valve core commonly used in the art. It should be noted that the cross-sectional profile of the adjusting part can be composed of multiple curves. An integrally formed pointed portion 1822 is provided at the bottom of the adjusting part 1821, protruding downwards from the bottom of the adjusting part 1821. The pointed portion 1822 alters the shape of the annular gap formed between the valve core 182 and the valve port 112. Compared to a valve core without the pointed portion, it can fill part of the refrigerant flow path, reducing the possibility of refrigerant eddies at the bottom of the valve core and helping to reduce refrigerant flow noise. It should be noted that the valve core structure can be applied to any of the above embodiments; that is, the valve core structure including the adjusting part and the pointed portion can be applied to the valve port structure of any embodiment to achieve better noise control.

[0071] As another specific implementation, the structure of the valve seat component can be further modified based on the above three embodiments, particularly the shape of the valve port. Please refer to... Figure 13 , Figure 13 This is a schematic diagram of the electronic expansion valve seat structure according to the fourth embodiment of the present invention. It should be noted that this embodiment is an improvement upon the first embodiment. As a complete embodiment, it only requires... Figure 11 The valve seat component shown replaces that of the first embodiment. Figure 1 The valve seat component shown can then be formed. To avoid making the description too lengthy, other electronic expansion valve components besides the valve seat component will not be described in this embodiment. It should also be noted that the valve seat component of this embodiment can be applied to the second or third embodiment. Those skilled in the art will understand that it is only necessary to replace the valve seat component in the technical solutions of the second or third embodiment with the valve seat component described in this embodiment. Therefore, the new technical solutions formed by these simple permutations and combinations should obviously also fall within the protection scope of this invention.

[0072] like Figure 13 As shown, the valve seat 11b of this embodiment includes a valve port portion 112b, which includes a mating portion 1121b and a flared portion 1122b. Unlike the first embodiment, the flared portion 1122b extends all the way to the bottom end of the valve port portion 112b. Figure 13 As shown, along the downward extension direction of the central axis, the thickness of the valve port 112b gradually increases in the flared portion 1122b. This gradual increase in thickness refers to the fact that the thickness of the valve port 112b gradually increases radially outward from the bottom of the mating portion 1121b. Let the height of the mating portion 1121b be h1, and the height of the flared portion 1122b be h2. The thickness of the valve port 112b in the mating portion 1121b can also be understood as the height of the mating portion 1121b, and the thickness of the valve port 112b in the flared portion 1122b can also be understood as the height of the flared portion 1122b. And the condition is satisfied: h1 < h2. The "flaring" mentioned in this specification refers to the diameter of the valve port; along the central axis direction of the valve port, starting from the bottom of the mating portion 1122b, the diameter of the valve port gradually increases.

[0073] The value of h1 can be between 0.15mm and 0.45mm, or even between 0.25mm and 0.35mm; the value of h2 can be between 4.5mm and 6.5mm, or even between 5.0mm and 6mm. The flared part 1122b is... Figure 13As shown in the longitudinal section, it is roughly trumpet-shaped. Along the longitudinal section of the valve port 112b passing through the central axis, the inner wall of the flared portion 1122b has two outlines. The two outlines are straight lines. The intersection point of one inner wall outline with the mating part is defined as X2 and the lowest point is X3. The intersection point of the other inner wall outline with the mating part is defined as Y2 and the lowest point is Y3. Then, the line connecting X2 and X3 and the line connecting Y2 and Y3 have an angle α. The value of the angle α satisfies: 40°≤α≤80°. It should be noted that when the value of h2 is between 4.5mm and 6.5mm, and the value of α is between 40° and 80°, there will inevitably be requirements on the diameter of the valve port 112b (or roughly understood as the through diameter of the second valve chamber B). However, commercially available electronic expansion valves do not have a second valve chamber; they only have a common connecting pipe (with an inner diameter usually not exceeding 8mm) connected to the valve port. Therefore, due to the inner diameter of the connecting pipe, it is impossible to simultaneously satisfy the aforementioned values ​​of h2 and α. In this embodiment, the through diameter of the second valve chamber H1, which is roughly defined by the valve body, is between 9mm and 30mm, or even between 11mm and 14mm. Based on this, the values ​​of h2 and α can be easily determined.

[0074] In this way, when the refrigerant flows in the first flow direction, it passes sequentially through the mating part 1121b and the flared part 1122b, which facilitates the diffusion of the refrigerant to the peripheral area, thereby reducing the noise of the refrigerant flowing in the first flow direction. That is, the channel space of the electronic expansion valve in the valve port 112 includes the space formed by the mating part 1121b and the valve core, and the space formed by the flared part 1122b and the valve core. When the refrigerant flows in the first flow direction, it flows sequentially through the mating part 1121b and the flared part 1122b, and then enters the second valve chamber B.

[0075] Compared to the flared portion 1122b of this embodiment, the mating portions described in the first, second, and third embodiments can be understood as the mating portions of this embodiment, and the flared portions described in the first, second, and third embodiments can be understood as a part of the flared portion 1122b of this embodiment. When the valve seat component of this embodiment is applied to an electronic expansion valve without a protrusion in the valve port portion 112b, testing has verified that it does not lead to a decrease in noise levels.

[0076] As a partial structural change to the fourth embodiment, the outline shape of the flared portion 1122b can be altered; please refer to... Figure 14 , Figure 14 This is a schematic diagram of another valve seat structure in this application. In this extended embodiment, the flared portion 1122b is no longer a standard conical shape, and its shape in the longitudinal section is not straight. Figure 14As shown, on the longitudinal and transverse planes passing through the central axis of the valve seat, the inner wall contour of the flared portion 1122b is an irregular curve. In this longitudinal section, the flared portion 1122b has two inner wall contour lines. One contour line is defined as intersecting the mating part at point X2, and its lowest point is defined as X3. The other contour line is defined as intersecting the mating part at point Y2, and its lowest point is defined as Y3. Limited by the height of the flared portion 1122b, there exists at least one cross-section Q1. This cross-section Q1 intersects the inner wall contour lines of the flared portion 1122b at points X1 and Y2. Connecting X1 and X2 yields a straight line, and connecting Y1 and Y2 yields another straight line. The two straight lines have an angle θ, which satisfies the condition: 40° ≤ θ ≤ 80°. The vertical height h4 from X1 to X2 satisfies: h4 ≥ 2.5 mm. This valve seat structure, when applied to either the first or second embodiment, can meet the noise requirements of the electronic expansion valve. Due to space limitations, the application of the valve seat in the second embodiment will not be described in detail; it is equivalent to adding a transition portion to the valve seat in this embodiment. It should be noted that the diameter of the valve port gradually increases along the central axis of the valve port. This gradual increase means that, in terms of the overall inner diameter of the valve port, the inner diameter near the second valve chamber B is generally larger than the inner diameter near the first valve chamber A. However, along the top-to-bottom direction, it is permissible for the inner diameter to decrease in a certain section, such as by providing a groove facing the inner wall of the valve port.

[0077] Please refer to Figure 15 , Figure 15This is a partial cross-sectional view of another embodiment of the valve seat structure of this application. In this extended embodiment, the outline of the inner wall of the flared portion 1122b is a continuous arc shape on the longitudinal and transverse planes passing through the central axis of the illustrated valve seat. In this longitudinal section, the flared portion 1122b has two inner wall outlines. The intersection point of one outline with the mating part is defined as X2, and the lowest point is defined as X3. The intersection point of the other outline with the mating part is defined as Y2, and the lowest point is defined as Y3. Limited by the height of the flared portion 1122b, there is at least one cross-section Q1. This cross-section Q1 intersects the outline of the inner wall of the flared portion 1122b at the two intersection points X1 and Y2. Connecting X1 and X2 results in a straight line, and connecting Y1 and Y2 results in another straight line. The two straight lines have an angle θ, which satisfies the condition: 40°≤θ≤80°. The vertical height h4 from X1 to X2 satisfies: h4≥2.5mm. At this point, the line connecting X2 and X3, and the line connecting Y2 and Y3, of the inner wall contour of the flared part have an angle of α. Since X3 and Y3 are relatively closer to the outer wall of the valve seat, the angle of α will be greater than 80°. However, since X1 and Y1 exist on the inner wall contour of the flared part, the angle of θ satisfies the condition: 40°≤θ≤80°, and also satisfies h4≥2.5mm, which still has the effect of reducing noise.

[0078] This valve seat structure, when applied to either the first or second embodiment, can also meet the noise requirements of the electronic expansion valve. Due to space limitations, the application of the valve seat in the second embodiment will not be described in detail; it is equivalent to adding a transition portion to the valve seat in this embodiment. It should be noted that the diameter of the valve port gradually increases along the central axis of the valve port. This gradual increase means that, in terms of the overall inner diameter of the valve port, the inner diameter near the second valve chamber B is generally larger than the inner diameter near the first valve chamber A. However, along the top-to-bottom direction, it is permissible for the inner diameter to decrease in a certain section, such as by providing a groove facing the inner wall of the valve port.

[0079] The technical features described in the above embodiments can be arranged and combined with each other without conflict, thereby forming more embodiments. Due to space limitations, the applicant will not list all the arrangements and combinations. Those skilled in the art should understand that these simple combinations obviously fall within the protection scope of this invention without requiring creative effort.

[0080] It should be noted that the directional terms such as "up," "down," "left," and "right" mentioned in this document are all introduced for ease of description, based on the accompanying drawings. Similarly, the ordinal numbers such as "first" and "second" in the component names are also introduced for ease of description and do not imply any limitation on the order of the components. Furthermore, since some parts of the components provided in the above embodiments have the same function, this specification adopts a unified naming convention for these parts. The electronic expansion valve provided by the relevant technical solution has been described in detail above. Specific embodiments have been used in this document for illustration. The descriptions of the above embodiments are only for helping to understand the method and core ideas of the present invention and are not intended to limit the present invention in any way.

Claims

1. An electronic expansion valve, comprising a valve seat, a valve body component, and a valve core, wherein the valve body component includes a valve body fixedly connected to the valve seat; the valve seat includes a valve port portion; the electronic expansion valve includes a first valve chamber (A) and a second valve chamber (B), the first valve chamber (A) being located on a side opposite to the valve port portion (112), and the second valve chamber (B) being located on a side opposite to the valve port portion; the electronic expansion valve is provided with a valve port (1121) at the valve port portion, the valve port (1121) being capable of communicating with the first valve chamber (A) and the second valve chamber (B); the electronic... The expansion valve has a first port (1211) and a second port (1221), the first port (1211) communicating with the first valve chamber (A), and the second port (1221) communicating with the second valve chamber (B); the valve core is at least partially located in the first valve chamber (A), and the valve core cooperates with the valve port (1121) to adjust the flow area of ​​the electronic expansion valve; the diameter of the valve port (1121) is smaller than the diameter of the second port (1221), and the diameter of the second port (1221) is smaller than the diameter of the second valve chamber (B); The valve port (112) includes a mating part (1123) and a flared part (1124). The mating part (1123) is closer to the first valve cavity (A) than the flared part (1124), and the flared part (1124) is closer to the second valve cavity (B) than the mating part (1123). The height h1 of the mating part (1123) is less than the height h2 of the flared part (1124), and the value of h1 satisfies: 0.15mm≤h1≤0.45mm. The inner diameter of the end of the flared part (1124) closer to the first valve cavity (A) is less than the inner diameter of the end of the flared part (1124) closer to the second valve cavity (B). Limited by the height of the flared portion (1124), located in the longitudinal section passing through the central axis of the valve seat (11), the flared portion (1124) has two inner wall contour lines. The intersection point of one inner wall contour line and the mating part is defined as X2, and the intersection point of the other inner wall contour line and the mating part is defined as Y2. The flared portion (1124) has at least one cross section Q1. The cross section Q1 intersects the two inner wall contour lines of the flared portion (1124) at X1 and Y1 respectively. Then, the connecting line of X1 and X2 and the connecting line of Y1 and Y2 have an angle θ. The value of θ satisfies: 40°≤θ≤80°. The value of the height h4 from X1 to X2 satisfies: h4≥2.5mm. The electronic expansion valve includes a second connecting pipe, the valve body has a side wall portion and a bottom wall portion (1413), the second connecting pipe is connected to the side wall portion, and the distance L from the bottom wall portion (1413) to the valve port portion is more than twice the diameter H2 of the second connecting pipe; The flared portion extends to the bottom end of the valve port. In the longitudinal section passing through the central axis of the valve port (112), the outline of the inner wall of the flared portion (1124) is a continuous arc. The height h1 of the mating part is less than the height h2 of the flared portion, and the value of h1 satisfies: 0.25mm ≤ h1 ≤ 0.35mm. The height h2 of the flared part satisfies: 5.0mm≤h2≤6mm, and the diameter H1 of the second valve chamber (B) satisfies: 11mm≤H1≤14mm; The through diameter H1 of the second valve chamber (B) satisfies the following conditions: H1≥1.3H3, H1≥1.3H2.

2. The electronic expansion valve as described in claim 1, characterized in that, The value of h2 satisfies: 2.5mm≤h2≤6.5mm, and the diameter H1 of the second valve chamber (B) satisfies: 9mm≤H1≤30mm.

3. The electronic expansion valve as described in claim 1, characterized in that, The valve port also includes a protrusion (1128) and a tail (1129). The protrusion (1128) protrudes toward the central axis of the valve port. The protrusion (1128) and the tail (1129) are closer to the second valve cavity (B) than the mating part (1123). The value of the angle α satisfies: 50°≤α≤70°.

4. The electronic expansion valve as described in claim 1, characterized in that, The diameter H1 of the second valve chamber (B) satisfies: 9mm≤H1≤30mm.

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