WO2021218845A1

WO2021218845A1 - Electronic expansion valve

Info

Publication number: WO2021218845A1
Application number: PCT/CN2021/089572
Authority: WO
Inventors: 魏先让; 沈自成
Original assignee: 浙江三花智能控制股份有限公司
Priority date: 2020-04-26
Filing date: 2021-04-25
Publication date: 2021-11-04
Also published as: CN113566459A

Abstract

An electronic expansion valve, comprising a valve base, a valve body component, a valve element, a porous component and a guide component, wherein the valve body component comprises a valve body, and the valve body is fixedly connected to the valve base; the valve base comprises a valve port part; a first valve cavity and a second valve cavity are further comprised, with the first valve cavity being located on the side opposite the upper portion of the valve port part, and the second valve cavity being located on the side opposite the lower portion of the valve port part; the valve port part is provided with a valve port which is in communication with the first valve cavity and the second valve cavity; the electronic expansion valve is provided with a first connector and a second connector, with the first connector being in communication with the first valve cavity, and the second connector being in communication with the second valve cavity; the valve element is at least partially located in the first valve cavity, and the valve element cooperates with the valve port to adjust the flow of the electronic expansion valve; the diameter of the valve port is smaller than that of the second connector, and the diameter of the second connector is smaller than that of the second valve cavity; and the guide component is fixedly connected to the valve base, at least most of the porous component is located in the first valve cavity, one end of a cylindrical portion directly or indirectly abuts against the guide component, and the other end of the porous component oppositely abuts against or is fixedly connected to the valve base.

Description

Electronic expansion valve

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office with the application number 2020103409326 and the invention title "Electronic Expansion Valve" on April 26, 2020, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the technical field of refrigeration control, and in particular to electronic expansion valves.

Background technique

The refrigeration system includes a compressor, a throttling element, two heat exchangers, and other parts. The throttling element can use an electronic expansion valve to adjust the throttling of the refrigerant. The use of an electronic expansion valve can achieve relatively precise control and improve system energy efficiency. . The electronic expansion valve generally includes a first port and a second port. The refrigerant can flow in from the first port and flow out from the second port, or flow in from the second port and flow out from the first port. When the refrigerant passes through the electronic expansion valve, a certain amount of noise may be generated. Improving the noise of the refrigerant passing through the electronic expansion valve is a technical topic that has been studied by related technicians of electronic expansion valves and refrigeration systems for a long time. Those skilled in the art are constantly making various attempts to improve the noise of the electronic expansion valve, but the product has been tested and found that some electronic expansion valve structures have relatively good noise when the refrigerant flows from the first interface of the electronic expansion valve to the second interface. , And the noise performance in the reverse flow is poor, and even high-frequency squealing sounds; some electronic expansion valve structures have relatively good noise when the refrigerant flows from the second interface of the electronic expansion valve to the first interface, and the reverse The noise performance is poor, and sometimes there will be high-frequency squeaking noises.

Summary of the invention

The object of the present invention is to provide an electronic expansion valve for improving the noise problem of refrigerant flowing through the electronic expansion valve.

In order to achieve the above objective, an embodiment of the present invention adopts the following technical solutions:

An electronic expansion valve includes a valve seat, a valve body part, a valve core, a porous part, and a guide part. The valve body part includes a valve body, and the valve body is fixedly connected to the valve seat; the valve seat includes a valve. At the mouth, the electronic expansion valve includes a first valve cavity and a second valve cavity, the first valve cavity is located on the relatively upper side of the valve mouth, and the second valve cavity is located on the relatively lower side of the valve mouth; The electronic expansion valve is provided with a valve port at the valve port, and the valve port can communicate with the first valve cavity and the second valve cavity; the electronic expansion valve has a first interface and a second interface, the first An interface is in communication with the first valve cavity, and the second interface is in communication with the second valve cavity; the valve core is at least partially located in the first valve cavity, and the valve core is used in conjunction 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 cavity; The guide member is fixedly connected to the valve seat, the porous member is at least mostly located in the first valve cavity, and one end of the cylindrical portion directly or indirectly abuts the guide member, and the other end of the porous member is in contact with the guide member. The valve seat is relatively abutted or fixedly connected.

In the above technical solution, two valve chambers are provided in the electronic expansion valve, which are respectively located on both sides of the valve port. The first valve chamber and the second valve chamber can communicate through the valve port, so that when the refrigerant is throttled in the first flow direction, the refrigerant section After the flow, it flows out to the second valve cavity, which has a relatively large space, and a porous part is arranged above the valve port, which can relatively improve the flow noise of the refrigerant.

Description of the drawings

FIG. 1 is a schematic structural diagram of an electronic expansion valve according to a first embodiment provided by this application;

Fig. 2 is an enlarged schematic diagram of part I of the electronic expansion valve shown in Fig. 1;

3 is a schematic partial cross-sectional view of the electronic expansion valve shown in FIG. 1 including a valve seat and valve body parts;

Figure 4 is a schematic cross-sectional view of the valve seat;

Fig. 5 is an enlarged schematic diagram of part II of Fig. 4;

FIG. 6 is a schematic diagram of an embodiment of another valve seat structure of this application;

FIG. 7 is a schematic structural diagram of an electronic expansion valve according to a second embodiment of this application;

8 is a schematic cross-sectional view of the valve seat component of the second embodiment;

Fig. 9 is an enlarged schematic diagram of part III of Fig. 7;

Figure 10 is a schematic diagram of another embodiment of the valve seat structure of this application

11 is a schematic structural diagram of an electronic expansion valve according to a third embodiment of this application;

Fig. 12 is an enlarged schematic diagram of part IV of Fig. 11;

13 is a schematic diagram of the valve seat structure of the electronic expansion valve of the fourth embodiment;

Figure 14 is a partial cross-sectional view of another embodiment of the valve seat structure of this application

FIG. 15 is a partial cross-sectional view of another embodiment of the valve seat structure of this application.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions provided by the present application, the technical solutions of the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

The first embodiment

Please refer to Figures 1 to 4, Figure 1 is a schematic structural view of the first embodiment of the electronic expansion valve, Figure 2 is a partial enlarged schematic view, and Figure 3 is a partial cross-sectional schematic view of the electronic expansion valve of Figure 1, mainly including a valve seat and Part of the valve body part, so that the structure of the valve port can be clear; Figure 4 is a schematic cross-sectional view of the valve seat part.

It should be pointed out that the following technical solutions are described for the specific electronic expansion valve structure. This application mainly improves the flow channel structure of the refrigerant flow to improve the flow noise of the refrigerant, specifically the structure of the valve cavity and the valve port. . Other components of the electronic expansion valve, such as magnetic rotor assembly, nut assembly, stop device, etc., are not limited here. The technical solution of the present application does not specifically limit the structure of the above-mentioned components. Those skilled in the art will use the technical solutions disclosed herein. , It can be applied to all similar electronic expansion valve structures. The description of the above-mentioned magnetic rotor assembly, screw valve core assembly and other components in this article is only to facilitate the understanding of the basic working principle of the electronic expansion valve, rather than to limit the structure.

The electronic expansion valve includes a valve seat 11, a valve body part 14, a connecting piece 15, a sleeve 16, a magnetic rotor assembly 17, a screw stem assembly 18, and a nut assembly 19. The valve body part 14 includes a valve body 141, The seat 11 and the valve body 141 are fixedly connected by welding. At the same time, the valve seat 11 is fixedly connected with a first connecting pipe 121, and the valve body component 14 is fixedly connected with a second connecting pipe 122. In the direction shown in Figure 1, on the upper side of the valve seat 11, a connecting piece 15 is provided. The connecting piece 15 is roughly in the shape of a cup with an open bottom and has an opening at the bottom. The connecting piece 15 is fixedly connected to the valve seat 11. It is fixedly connected with the sleeve 16, that is, the valve seat is connected with the sleeve through a connecting piece. Specifically, a step can be provided on the upper side of the valve seat 11, and the bottom opening of the connecting piece 15 can be matched with the step, and the two can be welded to fix them, or the two can be fixed relative to each other first, such as clamping and then welding. Fixed and so on.

On the upper side of the connecting piece 15, a sleeve 16 is also provided. The sleeve 16 and the connecting piece 15 can be fixed by welding. In this way, the sleeve 16, the connecting piece 15, and the valve seat 11 are fixedly connected. The inner space is provided with a magnetic rotor assembly 17, a screw valve core assembly 18, and a nut assembly 19. It is worth noting that in the above structure, the connecting piece 15 is not necessary. When the connecting piece 15 is not present, the sleeve 16 can also be directly fixedly connected to the valve seat 11, or other parts can be fixed. For example, the outer edge of the valve seat 11 is directly extended upwards and then welded to the sleeve 16 to be fixed.

The magnetic rotor assembly 17 can be rotated by inducing the electromagnetic force of the electromagnetic coil. The magnetic rotor assembly 17 includes a magnetic rotor 171 and a connecting plate 172 fixedly connected or integrally provided with the magnetic rotor 171. Specifically, the connecting plate 172 can be used as an insert to form a magnetic轮171。 Rotor 171. The screw valve core assembly 18 includes a screw rod 181, which is fixedly connected to the connecting plate 172. In this way, the screw rod 181 is connected to the magnetic rotor assembly 17 through the connecting plate 172 as a whole. Specifically, the screw rod 181 and the connecting plate 172 It can be fixedly connected by welding or connected by other fixed connection or limit connection methods such as clip connection and crimp connection. The stop rod 173 is fixedly connected to the magnetic rotor assembly 17 and is generally located in an area substantially enclosed by the magnetic rotor 171.

The screw valve core assembly 18 includes a screw rod 181, a valve core 182, a valve core sleeve 183, a spring 184, a washer part 185, a retaining ring part 186, and a sleeve part 187. The screw rod 181 and the valve core 182 realize a floating connection through 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 screw rod 181 is fixedly connected with a shaft sleeve member 187. The connection can be fixed by welding. At least part of the valve core 182 is located in the first valve cavity A (see below). When the electronic expansion valve is working, the valve core 182 can move a certain stroke relative to the valve port under the drive to cooperate with the valve port 1121 to adjust the flow rate. That is, during the operation of the electronic expansion valve, the valve core 182 can move up and down within a certain stroke relative to the valve port 112 to adjust the opening degree of the valve port 1121. A retaining ring portion 186 and a gasket portion 185 are provided on the upper end surface of the valve core sleeve 183. The retaining ring portion 186 in this embodiment is not limited to the C-shaped opening retaining ring shown in the figure, and opening retaining rings of other shapes can also be used. Substitution; in the same way, the washer portion 185 in this embodiment is not limited to the circular ring-shaped washer in the figure, and can also be replaced by other retaining rings that can play the same role, for example, an open retaining ring can also be used instead. The spring 184 is sheathed on the screw rod 181. Specifically, one end of the spring 184 abuts against the upper flange part 1811 of the screw rod, and the other end of the spring 184 abuts against the washer part 185. Under the action of the spring 184, the washer part 13 and the lower flange Part 1812 offset. It is worth noting that one end of the spring 14 abuts the upper flange portion 1811, including one end of the spring 184 directly abuts the upper flange portion 1551, and also includes one end of the spring 184 indirectly abuts the upper flange portion 1551, for example, the spring 184 and A retaining ring or other components are separately provided between the upper flange portions 1551. The maximum outer diameter of the sleeve part 187 is greater than the minimum inner diameter of the central through hole of the valve core sleeve 183, so that after the assembly is completed, the valve core 182 cannot be separated from the screw rod 181. Due to the action of the spring 184, the valve core 182 When abutting against the valve port, the valve core 182 and the screw rod 181 can make a certain stroke of relative movement. The detachment mentioned herein means that the sleeve part 183 and the screw rod 181 are separated into two separate parts without any restriction to each other, and not only that the two have no physical contact.

The nut assembly 19 includes a nut 191 and a connecting piece 192. The nut 191 is fixedly connected to the connecting piece 192. The connecting piece 192 can be stamped and formed from a metal plate. The nut 191 is fixed to the sleeve 16 and/or the connecting piece 15 through a metal connecting piece 192. If provided, the nut 191 may be formed by injection molding using a non-metallic material with the connecting piece 192 as an insert, and the connecting piece 192 and the connecting piece 15 may be fixedly connected by welding. When the connecting piece is not provided, the connecting piece 192 and the valve seat 11 or the sleeve can be fixedly connected by welding.

The nut 191 has a through hole penetrating along its axial direction. The nut is provided with internal threads on the inner side wall where the through hole is provided. Correspondingly, the outer peripheral surface of the screw rod 181 is provided with corresponding external threads. When 17 rotates, under the action of the thread pair, while rotating, the screw rod 181 also moves up and down relative to the nut assembly 19, thereby driving the valve core 182 to move up and down within a certain range.

A spring guide rail 1911 is provided on a part of the outer edge of the nut 191, and the spring guide rail 1911 is fixedly connected or connected with the nut 191 in a fixed position, so that the spring guide rail 1911 and the nut 191 realize relative positioning in both the axial direction and the circumferential direction, and the stop rod 173 rotates with the magnetic rotor assembly, and drives the slip ring 1912 to spirally slide along the spring guide 1911. The nut assembly is provided with an upper stop part and a lower stop part, and the slip ring 1912 can abut against the upper stop part to stop rotating At the same time, the slip ring 1912 can abut against the lower stop and stop rotating.

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 diameter is smaller than the outer diameter of the second outer edge portion 202, and the outer diameter of the first outer edge portion 201 is adapted to the inner hole of the lower end of the nut 191. In this way, the nut 191 is sleeved on the upper end of the guide portion 20 during assembly. The first outer edge 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 part of the inner wall of the valve seat 11, and can be guided during assembly. Specifically, interference press fitting or welding can be used to make the guide portion 20 and the valve seat 11 Fixed connection. Of course, those skilled in the art can 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, based on the fact that the inner diameter of the inner hole of the valve seat is smaller than the inner hole of the lower end of the nut. As an equivalent alternative, the inner diameter of the inner hole of the valve seat may be set larger than the inner diameter of the lower end of the nut, or the inner diameters of the two may be set to be the same or approximately the same. The guide portion 20 is also provided with a valve core guide portion 203, which 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 to the valve core, which can relatively reduce the abnormal wear of the valve port caused by the swing of the valve core. It should be noted that the above-mentioned first outer edge portion 201, second outer edge portion 202, and valve core guide portion 203 are all provided in a certain area or a certain part of the surface of the guide part 20, and this area or part can achieve corresponding The guiding function is not a restriction on the shape of the guiding portion 20. In fact, the guide portion 20 can be adapted to the size of the nut, the size and shape of the valve seat, as long as it includes the first outer edge portion 201 that can guide the nut and the first outer edge portion 201 that can guide the valve seat. The two outer edge portions 202 and the valve core guide portion 203 that guides the valve core belong to the guide portion described in the embodiment of the present invention.

At least part of the guide part 20 is located in the first valve chamber A. In addition to guiding the valve core, the lower end of the guide part changes the shape of the first valve chamber A, and can produce a certain amount of fluid flowing into the first valve chamber A. Influence, help to further reduce the noise of fluid flow.

The electronic expansion valve includes a valve seat 11, a valve body part 14, a first connecting tube 121, and a second connecting tube 122. The valve seat 11, the valve body part 14, the first connecting tube 121 and the second connecting tube 122 are fixedly connected by welding. Specifically, the valve The seat 11 and the valve body 141 are fixedly connected by welding, the valve seat 11 and the first connecting pipe 121 are fixedly connected by welding, and the valve body 141 and the second connecting pipe 122 are fixedly connected by welding. The valve seat 11 has a valve port 112, and the valve port 112 is provided with a valve port 1121. The electronic expansion valve has a first valve chamber A and a second valve chamber B. In the present application, a valve chamber above the valve port 112, and The part communicating with the first port 1211 of the first connecting pipe 121 is the first valve chamber A, and the valve chamber below the valve seat and communicating with the second port 1221 of the second connecting pipe 122 is the second valve chamber B. A valve chamber A and a second valve chamber B can communicate through the valve port 1121. The first valve chamber A is located on the upper side of the valve port 112, and the second valve chamber B is located on the lower side of the valve port 112. The valve port 1121 The diameter D is smaller than the diameter H2 of the second port 1221, the diameter H2 of the second port 1221 is smaller than the diameter H1 of the second valve chamber B, and the diameter H3 of the first port 1211 is smaller than the diameter of the second valve chamber B. H1. In this embodiment, the second valve chamber B is not limited to the same diameter. If the diameter is different, the diameter H1 of the second valve chamber B refers to the maximum diameter. In this embodiment, the diameter H1 of the second valve chamber B, the diameter H3 of the first port 1211, and the diameter H2 of the second port 1221 satisfy the conditions: H1≥1.3H3, H1≥1.3H2.

In addition, the valve body 141 is also provided with an inwardly flanged portion 1412 on the side wall portion 1411 of the valve body 141 to facilitate the mating connection with the second connecting pipe 122. The material of the valve body 141 can be stainless steel. For example, the valve body is formed by drawing, punching or extrusion processing of a stainless steel plate or pipe.

Some systems may require electronic expansion valves to flow in both directions. In this article, the flow of refrigerant from the first port to the second port is defined as the first flow direction, and the direction of refrigerant flowing from the second port to the first port is defined as the second flow direction. In other words, the flow of refrigerant from the first connecting pipe to the second connecting pipe through the first valve cavity, valve port, and second valve cavity is defined as the first flow direction. The refrigerant flows from the second connecting pipe through the second valve cavity, valve port, and first valve. The flow of the cavity toward the first nozzle is defined as the second flow direction.

The valve port 112 of this embodiment includes a mating part 1123 and a flaring part 1124. The mating part 1123 can be used to cooperate with the valve core and change the flow area of the electronic expansion valve as the valve core rises and falls. The mating portion 1123 may be a straight section, that is, along the central axis, the inner diameter of the mating portion 1123 remains unchanged, which is convenient for processing. Of course, it is also allowed to set the inner diameter of the mating portion 1123 to gradually increase or decrease from top to bottom. Small frustum shape, but generally the cone angle does not exceed 5°, that is, the mating portion 1123 is closer to a straight section. Wherein, the matching portion 1123 is closer to the first valve cavity A than the flaring portion 1124, the flaring portion 1124 is located below the matching portion 1123, and the matching portion 1123 and the flaring portion 1124 are continuously arranged, please refer to FIG. 5, which is A cross-sectional view of the valve port 112 of this embodiment. Along the extending direction of the central axis from top to bottom, the thickness of the valve port 112 gradually increases radially outward from the bottom of the mating portion 1123 when the top of the valve port remains flat, that is, the valve port The wall thickness of the portion 112 at the part of the mating portion 1123 is relatively thinnest, and gradually increases along the downward extending direction of the flaring portion 1124. In this way, the inner diameter of the end of the flaring portion 1124 close to the first valve cavity A is smaller than the inner diameter of the end of the flaring portion 1124 close to the second valve cavity B.

Assuming that the height of the mating portion 1123 is h1, and the height of the flaring portion 1124 is h2, the wall thickness of the valve port 112 at the mating portion described above can also be understood as the height of the mating portion 1123, and the valve port 112 is expanding. The wall thickness of the mouth can also be understood as the height of the flared portion 1124, so that h1<h2. It should be noted that the “flaring” mentioned in this specification refers to the diameter of the valve port, and the diameter of the valve port gradually increases along the direction of the center axis of the valve port. It should be noted that the gradual increase trend mentioned here means that in terms of the inner diameter of the valve port as a whole, 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-down direction, it is allowed to reduce the inner diameter of a certain section, such as 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 portion 1124 is roughly flared in the longitudinal section shown in FIG. 5, and along the longitudinal section passing through the central axis, the inner wall of the flared portion 1124 has two contour lines, and the two contour lines are straight lines, which define The highest point of one of the inner wall contour lines is X2 and the lowest point is X3. The highest point of the other inner wall contour line is defined as Y2 and the lowest point is Y3. Then there is a connection line between X2 and X3, and a connection line between Y2 and Y3. The angle α, the value of α is between 40°-80°. In this way, when the refrigerant flows in the first flow direction, the refrigerant passes through the matching portion 1123 and the flared portion 1124, which facilitates the diffusion of the refrigerant to the peripheral area, thereby improving the noise of the refrigerant flowing in the first flow direction. That is, the passage space of the valve port 112 of the electronic expansion valve includes the space formed by the mating portion 1123 and the valve core and the space formed by the flaring portion 1124 and the valve core. When the refrigerant flows in the first flow direction, it first flows through the valve port 1121. Pass through the flaring part 1124, and then enter the second valve chamber B.

In this embodiment, the valve port 112 further includes a protruding portion 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 frustum-shaped inner wall of the flared portion 1124, The protruding portion 1128 is in a protruding state in the direction of the central axis. The tail portion 1129 can be set to be substantially in the same extending direction as the flaring portion 1124. In other words, it can be understood that the tail portion 1129 is an extension of the flaring portion 1124, and the protruding portion 1128 is located on the inner wall of the extended flaring portion, and faces the central axis. The direction is convex. Of course, on the cross section shown in Figure 2, the tail 1129 is not necessarily set to have the same angle value as the flared portion 1124. After the applicant’s test, the angle of the tail 1129 on the extension line of the cross section is 40°- The range of 80° is sufficient, and it can still ensure a better noise control effect.

It should be noted that when the value of h2 is between 2.5mm-4.5mm and the value of α is between 40°-80°, the diameter of the valve port 112 (or roughly understood as the first The diameter of the second valve chamber B) is required, and the general electronic expansion valve on the market does not have a second valve chamber, and only connects an ordinary pipe to the valve port (the inner diameter usually does not exceed 8mm), then Limited by the inner diameter of the tube, it is impossible to meet the above values of h2 and α at the same time. In this embodiment, the diameter of the second valve cavity H1 roughly defined by the valve body is between 9mm-30mm, and even between 11mm-14mm. On this basis, the above-mentioned h2 can be easily achieved. The value and the value of α.

The valve port structure provided in this embodiment can reduce noise to a certain extent, and in particular, the noise test result in the first flow direction is relatively good, and is better than the noise test result in the second flow direction.

As a partial structural change of the above-mentioned first embodiment, the contour shape of the flaring portion 1124 can be changed. Please refer to FIG. 6, which is a schematic diagram of another valve seat structure of the present application. In this expanded embodiment, the flaring The portion 1124 is no longer in a standard cone shape, and its shape in the longitudinal section is also not linear. As shown in Figure 12, with the height of the flaring portion 1124 as a limit, it is located in a longitudinal section passing through the central axis of the valve seat. The flaring portion 1124 has two inner wall contour lines, and the two contour lines are curved. An example of a curve can actually use a variety of different curve shapes, or a combination of multiple curve shapes, a combination of curves and straight lines, and so on. Define the intersection point of one of the inner wall contour lines and the mating portion 1123 as X2, the lowest point as X3, and define the intersection point of the other inner wall contour line and the mating portion 1123 as Y2 and the lowest point as Y3, then at least one cross-section Q1 exists. Section Q1 and the contour lines of the two wheel inner walls of the flaring part 1124 intersect at two points X1 and Y1 respectively. Connect X1 and X2 to obtain a straight line, and connect Y1 and Y2 to obtain another straight line. The two straight lines have an angle of θ, θ The angle meets the condition: 40°≤θ1≤80°. The value of the height h4 from X1 to X2 in the vertical direction satisfies: h4≥2.5mm. The valve seat with this structure can also meet the noise requirements of the electronic expansion valve when applied to the first embodiment.

Second embodiment

7-10, the second embodiment of the present invention will be described.

Please refer to FIGS. 7-10, where FIG. 7 is a schematic structural diagram of an electronic expansion valve according to a second embodiment of this application; FIG. 8 is a schematic cross-sectional view of the valve seat component of the second embodiment; FIG. 9 is a diagram of FIG. 8 Part III is an enlarged schematic diagram, and FIG. 10 is a partial cross-sectional schematic diagram of another valve seat component.

In order to facilitate the description of this embodiment, especially to reflect the difference between this embodiment and the first embodiment, in the technical solution, components with the same structure and function as those in the first embodiment are given the same reference numerals, and Make a brief description, focusing on the differences between the two in detail.

Similar to the first embodiment, the technical solution of this embodiment is to improve the structure of the valve cavity and the valve port to achieve the purpose of improving noise. Other components of the electronic expansion valve, such as magnetic rotor assembly, nut assembly, stop device, etc., are not limited here. The technical solution of the present application does not specifically limit the structure of the above-mentioned components. Those skilled in the art will use the technical solutions disclosed herein. , It can be applied to all similar electronic expansion valve structures.

The magnetic rotor assembly 17, the screw valve core assembly 18, the connecting piece 15, the sleeve 16, the valve body member 14, the nut assembly 19, and the guide part 20 in this embodiment can all adopt the same structure as the first embodiment. This will not be repeated here.

The electronic expansion valve includes a valve seat 11a, a valve body part 14, a first connecting tube 121, and a second connecting tube 122. The valve seat 11a, the valve body part 14, the first connecting tube 121, and the second connecting tube 122 are fixedly connected by welding. Specifically, the valve The seat 11a and the valve body 141 are fixedly connected by welding, the valve seat 11a and the first connecting pipe 121 are fixedly connected by welding, and the valve body 141 and the second connecting pipe 122 are fixedly connected by welding. The valve seat 11a has a valve port 112a, and the valve port 112a is provided with a valve port 1121a. The electronic expansion valve has a first valve chamber A and a second valve chamber B. In this application, a valve chamber above the valve port 112a, and The part communicating with the first port 1211 of the first connecting pipe 121 is the first valve chamber A, and the valve chamber below the valve seat and communicating with the second port 1221 of the second connecting pipe 122 is the second valve chamber B. A valve chamber A and a 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 112a, and the second valve chamber B is located on the lower side of the valve port 112a. The valve port 1121a The diameter D is smaller than the diameter H2 of the second port 1221, the diameter H2 of the second port 1221 is smaller than the diameter H1 of the second valve chamber B, and the diameter H3 of the first port 1211 is smaller than the diameter of the second valve chamber B. H1. In this embodiment, the second valve cavity B is not limited to the same diameter. If the diameter is different, the diameter H1 of the second valve chamber B refers to the maximum diameter.

The valve port 112a of this embodiment includes a mating part 1123a and a flaring part 1124a. The mating part 1123a can be used to cooperate with the valve core and change the flow area of the electronic expansion valve as the valve core rises and falls. The mating portion 1123a can be a straight section, that is, along the central axis, the inner diameter of the mating portion 1123a remains unchanged, which is convenient for processing. Of course, it is also allowed to set the inner diameter of the mating portion 1123a to gradually increase or decrease from top to bottom. It has a small frustum shape, but generally the taper angle does not exceed 5°, that is, the mating part 1123 is closer to a straight section, and the mating part 1123a is described as a straight line in the following description. The difference from the first embodiment is that a transition portion 1122a is further provided above the mating portion 1123a. That is, the transition portion 1122a is located at the opposite top of the valve port portion 112a, the mating portion 1123a and the flaring portion 1124a are sequentially located below the transition portion 1122a, and the valve seat 11a is made of one-piece material. As shown in Figure 8, along the extending direction of the central axis from top to bottom, the thickness of the valve port portion 112a gradually decreases at the transition portion 1122a, remains basically unchanged at the mating portion 1123a, and gradually increases at the flaring portion 1124a . The gradual increase in thickness mentioned here means that the thickness of the valve port portion 112a gradually increases radially outward from the bottom of the mating portion 1123a. Assuming that the height of the mating portion 1123a is h1, the height of the flaring portion 1124a is h2, and the height of the transition portion 1122a is h3, the thickness of the valve port 112a at the transition portion 1122a mentioned above can also be understood as the height of the transition portion 1122a, The thickness of the valve port 112a at the mating portion 1123a can also be understood as the height of the mating portion 1123a, and the thickness of the valve port 112a at the flaring portion 1124a can also be understood as the height of the flaring portion 1124a. And meet the condition: h3<h1<h2. The "flaring" mentioned in this specification refers to the diameter of the valve port, along the center axis direction of the valve port, starting from the bottom of the mating portion 1123a, the diameter of the valve port gradually increases. The gradual increase trend mentioned here refers to 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, but along the The top-down direction allows the inner diameter of a certain section to be reduced, such as setting a groove facing the inner wall of the valve port.

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

The flared portion 1124a is roughly flared in the longitudinal section shown in FIG. 9, and the inner wall of the flared portion 1124a is as large as an angle of α at the extension line of the cross section, and the value of α is an acute angle, And between 40°-80°. The transition portion 1122a is formed by chamfering the valve port toward the first valve cavity A, and the transition portion 1122a is arranged adjacent to the first valve cavity A. Since the height of the transition portion 1122a is relatively small, from an enlarged view, the cross-sectional shape may be linear or curved. In the longitudinal section shown in Fig. 8 as an example, the transition portion is a straight horn shape, and the transition portion 1122a is located at the extension line of the section as large as an angle of γ, the value of γ is an acute angle, and is at 40°- Between 80°. In this way, when the refrigerant flows in the first flow direction, the refrigerant passes through the transition portion 1122a, the mating portion 1123a, and the flared portion 1124a, which facilitates the diffusion of the refrigerant to the peripheral area, thereby improving the noise of the refrigerant flowing in the first flow direction . That is, the passage space of the valve port 112 of the electronic expansion valve includes a transition portion 1122a, a space formed by a mating portion 1123a and the valve core, and a space formed by a flaring portion 1124 and the valve core. When the refrigerant flows in the first flow direction, it flows through in sequence. The crossing portion 1122a, the matching portion 1123a, and the flaring portion 1124 enter the second valve cavity B again.

As a partial change to the second embodiment, the transition portion described above is not limited to a truncated cone shape, that is, the longitudinal section of the transition portion is not limited to a straight line. Please refer to Figure 10, which is a partial cross-sectional view of another valve seat structure of this embodiment. The contour line of the transition portion 1122a1 in the longitudinal section is curved. Since the height h5 of the transition portion is only between 0.05mm-0.2mm, Changing the straight line of the longitudinal section to an arc-shaped or curved section will not affect the technical effect of this embodiment.

Similar to the first embodiment, when the value of h2 is between 2.5mm-4.5mm and the value of α is between 40°-80°, the diameter of the valve port 112a (or roughly understandable It is required for the diameter of the second valve chamber B), and the general electronic expansion valve on the market does not have a second valve chamber, and only connects an ordinary pipe to the valve port (the inner diameter usually does not exceed 8mm) , It is limited by the inner diameter of the tube and cannot meet the above values of h2 and α at the same time. In this embodiment, the diameter of the second valve cavity H1 roughly defined by the valve body is between 9mm-30mm, and even between 11mm-14mm. On this basis, the above-mentioned h2 can be easily achieved. The value and the value of α.

The valve port structure provided by this embodiment can reduce noise to a certain extent, especially the noise test result in the second flow direction is relatively good, and is better than the noise test result in the first flow direction.

The third embodiment

Next, referring to Figs. 11-12, the third embodiment of the present invention will be described.

Please refer to FIG. 11 and FIG. 12, where FIG. 11 is a schematic structural diagram of an electronic expansion valve according to a third embodiment of this application; FIG. 12 is an enlarged schematic diagram of part IV in FIG. 11.

The valve seat 11 of this embodiment also adopts the same structure as the first embodiment, including a valve port 112, and the valve port includes a matching portion 1123 and a flaring portion 1124. The difference from the first embodiment is that the present embodiment further includes a porous member 21, which is at least mostly located in the first valve cavity A and relatively abuts or is fixedly connected to the valve seat. The abutment mentioned here includes both direct abutment and indirect abutment. For example, adding a gasket between the porous component and the valve seat can be regarded as indirect abutment between the porous component and the valve seat. The porous component 21 is open at both ends, and can be formed by sintering metal balls, such as sintering small copper balls. This structure can withstand a certain pressure without falling off, chipping, or scattering. Specifically, during installation, a ring-shaped mounting groove 1125 can be provided on the top of the valve port 112 of the valve seat 11 outside the valve port. When installing, first align the ring-shaped bottom of the porous member 21 with the mounting groove 1125. Then, the guide member 20 is installed, the guide member 20 is abutted with the porous member 21 by setting a predetermined dimensional tolerance, and a certain pressure is applied to the porous member 21 to fix the porous member 21 on 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 member and the guiding member can be regarded as indirect abutment between the porous member and the guiding member. Due to the existence of the installation groove 1125, the porous member 21 is not easily deviated from the valve seat, thereby making the structure more stable. After the refrigerant flows into the first valve cavity A from the first connecting pipe, it first passes through the porous member 21, then enters the valve port, and flows into the second valve cavity B.

As a partial alternative in this embodiment, the annular mounting groove 1125 may not be provided on the outside of the valve port, but the porous member 21 is directly placed on the top of the valve port, so that the ring of the cylindrical member 21 The shaped bottom directly abuts against the top plane of the valve port. By applying a certain pressure to the porous member 21 during installation, the porous member 21 is deformed to a certain extent to ensure that the porous member 21 does not loosen in the axial direction after the installation is completed. . The porous component 21 can be formed by sintering small copper balls, and there is a relatively strong bonding force between the small copper balls, and it can also be prevented from dispersing or falling off under the condition of certain deformation. Alternatively, the porous member 21 may also be formed by sintering stainless steel wire, that is, as long as a porous gap can be formed to allow the refrigerant to pass through.

In the above two installation methods, after installation, the axial direction is limited to the height of the porous member 21, the first valve cavity A is separated by the porous member 21, and the space inside the porous member of the first valve cavity A passes through the valve port 1121 Connected with the second valve cavity A, the first valve cavity A is in direct communication with the first port 1211 in the space outside the porous component, and the first port 1211 and the second port are connected through the porous component 21, the valve port 1121, and the second valve cavity B .

The porous member 21 is formed by winding copper balls. The refrigerant can pass through the gap formed between the copper balls of the porous member. In order to reduce the blocking of the porous member when there are too many impurities, the porous member 21 can be further provided The penetrating portion 211 penetrating the cylindrical wall portion of the penetrating portion 211 connects the inner cavity space of the porous member with the outer cavity space, which can reduce the risk of the porous member being blocked by impurities. Figure 10 shows a schematic diagram of the through part 211. The through part 211 is a number of notches provided 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 The specific structure is not limited to that shown in FIG. 11, as long as the wall of the porous member can be penetrated. For example, the penetration portion 211 can be provided at the bottom of the porous member, or a notch can be used, or even on the side wall of the porous member. The way of punching and so on.

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

The electronic expansion valve described in the above three embodiments is provided with two valve chambers, which are respectively located on both sides of the valve port. The first valve chamber and the second valve chamber can communicate through the valve port, so that when the refrigerant is throttled in the first flow direction , The refrigerant flows out to the second valve cavity after throttling, the second valve cavity has a relatively large space, combined with the valve port or the valve port combined with the porous part, the flow mode and flow space of the refrigerant are changed, thereby improving the refrigerant The flow noise.

The valve body described in each of the above embodiments can be formed by processing stainless steel material by stretching or extrusion, such as processing by plate or pipe, which can make processing relatively convenient and make the wall thickness of the valve body less than 1 mm. The diameter mentioned in this article means that its cross-section is not limited to a circular shape. For example, the cross-section of the valve port is not limited to a circular shape, but can also include other shapes, such as the diameter of the second valve cavity, and its cross-section is not limited to a circular shape. . The diameter H2 of the second port is greater than the diameter D of the valve port 1121, the diameter H1 of the second valve chamber B is greater than the diameter H2 of the second port connected by the second connecting pipe, and the diameter H1 of the second valve chamber B is greater than the diameter H1 of the second port. The diameter H3 of the first interface connected by a connecting pipe, and the diameter H2 of the second interface connected by the second connecting pipe is larger than the diameter D of the valve port 1121. Here, the through diameter is equivalent to the equivalent internal diameter, that is, the internal diameter value when the cross-sectional area is transformed into a circle with the same cross-sectional area, or the two have the same cross-sectional area, so that they have the same flow area. The valve body has a bottom wall portion 1413, and the distance L from the bottom wall portion 1413 to the valve port is more than twice the diameter H2 of the second connecting pipe 122, that is, the second valve cavity B has sufficient height to reduce fluid noise Has a certain effect.

In addition, as another specific embodiment, the valve core 182 includes an adjusting portion 1821 and a pointed portion 1822. The adjusting portion 1821 and the pointed portion 1822 are approximately located at the bottom end of the valve core 182, wherein the pointed portion 1822 is located at the adjusting portion. Below 1821. The cross-sectional contour line of the adjusting portion 1821 is roughly in a smoothly transitioned curve shape. When the valve core 182 is in contact with the valve port 112 and is in the closed state, the outer edge of the adjusting portion 1821 contacts the valve port 112. When the electronic expansion valve opens, the screw drives the valve core 182 to move upward. , An annular gap is formed between the outer edge of the adjusting portion 1821 and the valve port 112 for the passage of refrigerant, and as the valve core 182 gradually moves upward, the cross-sectional contour line of the adjusting portion 1821 is a smooth transition curve, The above-mentioned annular gap will also change in size accordingly, and the flow rate is roughly adjusted in a proportional state, which is different from the linear adjustment state of the frustum-shaped valve core commonly used in this field. It should be noted that the cross-sectional contour line of the adjusting portion may be a combination of multiple curves. An integrally structured pointed portion 1822 is provided at the bottom of the adjusting portion 1821, and the entire pointed portion 1822 protrudes downward from the bottom of the adjusting portion 1821. The pointed part 1822 changes the shape of the annular gap formed between the valve core 182 and the valve port 112. Compared with the valve core without the pointed part, it can fill a part of the refrigerant flow path and reduce the refrigerant at the bottom of the valve core. There is the possibility of vortex, which helps to reduce the noise of refrigerant flow. It should be noted that the structure of the valve core can be applied to any of the above embodiments, that is, the valve core structure including the adjusting portion and the pointed portion is applied to the valve port structure of any embodiment to obtain better noise control. Effect.

As yet another specific implementation manner, on the basis of the above three embodiments, the structure of the valve seat member can be further changed, especially the shape of the valve port. Please refer to FIG. 13, which is a schematic diagram of a valve seat structure of an electronic expansion valve according to a fourth embodiment of the present invention. It should be noted that this embodiment is improved on the basis of the first embodiment. As a complete embodiment, it is only necessary to replace the valve seat member shown in FIG. 11 with that shown in FIG. 1 of the first embodiment. The valve seat part can be formed. In order to make the description not excessively lengthy, in this embodiment, other electronic expansion valve components other than the valve seat component will not be described. At the same time, it should be noted that the valve seat component of this embodiment can be applied to the second embodiment or the third embodiment. Those skilled in the art will understand that only the technical solutions of the second embodiment or the third embodiment are required. The valve seat member in is replaced with the valve seat member described in this embodiment. Therefore, the new technical solutions formed by these simple permutations and combinations should obviously belong to the protection scope of the present invention.

As shown in Figure 13, the valve seat 11b of this embodiment includes a valve port 112b, and the valve port 112b includes a mating portion 1121b and a flaring portion 1122b. The difference from the first embodiment is that the flaring portion 1122b extends to the valve The bottom end of the mouth 112b. As shown in FIG. 13, along the extending direction of the central axis from top to bottom, the thickness of the valve port portion 112b gradually increases at the flared portion 1122b. The gradual increase in thickness mentioned here means that the thickness of the valve port portion 112b gradually increases radially outward from the bottom of the mating portion 1121b. Assuming that the height of the mating portion 1121b is h1, the height of the flaring portion 1122b is h2, the thickness of the valve port 112b at the mating portion 1121b can also be understood as the height of the mating portion 1121b, and the thickness of the valve port 112b at the flaring portion 1122b can also be It is understood as the height of the flared portion 1122b. And meet the condition: h1<h2. The "flaring" mentioned in this specification refers to the diameter of the valve port, along the center axis direction of the valve port, starting from the bottom of the mating portion 1122b, the diameter of the valve port gradually increases.

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 portion 1122b is roughly flared in the longitudinal section shown in FIG. 13, and along the longitudinal section of the valve port 112b passing through the central axis, the inner wall of the flared portion 1122b has two contour lines, two contours The line is a straight line. Define the intersection point of one of the inner wall contour lines and the mating part as X2 and the lowest point as X3, define the intersection point of the other inner wall contour line and the mating part as Y2 and the lowest point as Y3, then the connecting line of X2 and X3, There is an angle α between the connecting lines of Y2 and Y3, and the value of the angle α satisfies: 40°≤α≤80°. It should be noted that when the value of h2 is between 4.5mm-6.5mm and the value of α is between 40°-80°, the diameter of the valve port 112b (or roughly understood as the first The diameter of the second valve chamber B) is required, and the general electronic expansion valve on the market does not have a second valve chamber, and only connects an ordinary pipe to the valve port (the inner diameter usually does not exceed 8mm), then Limited by the inner diameter of the tube, it is impossible to meet the above values of h2 and α at the same time. In this embodiment, the diameter of the second valve cavity H1 roughly defined by the valve body is between 9mm-30mm, and even between 11mm-14mm. On this basis, h2 can be easily selected. Value and the value of α.

In this way, when the refrigerant flows in the first flow direction, the refrigerant sequentially passes through the matching portion 1121b and the flared portion 1122b, which facilitates the diffusion of the refrigerant to the peripheral area, thereby improving the noise in the first flow direction of the refrigerant. That is, the passage space of the valve port 112 of the electronic expansion valve includes the space formed by the fitting portion 1121b and the valve core, and the space formed by the flaring portion 1122b and the valve core. When the refrigerant flows in the first flow direction, it flows through the fitting portion 1121b, The flared portion 1122b then enters the second valve chamber B.

Compared with the flared portion 1122b of this embodiment, the mating parts described in the first, second, and third embodiments can be understood as the mating parts of this embodiment, and the first and second embodiments The flared portion described in the mode and the third embodiment is understood to be a part of the flared portion 1122b of this embodiment. In the case where the valve port 112b is not provided with a protruding portion, when the valve seat member of this embodiment is applied to an electronic expansion valve, it has been verified by experiments that the noise effect will not deteriorate.

As a partial structural change of the fourth embodiment, the contour shape of the flaring portion 1122b can be changed. Please refer to FIG. 14, which is a schematic diagram of another valve seat structure of the present application. In this expanded embodiment, the flaring portion 1122b is no longer a standard cone shape, and its shape in longitudinal section is not a straight line either. As shown in FIG. 14, the contour line of the inner wall of the flared portion 1122b is an irregular curve in the vertical and horizontal planes of the valve seat shown in the figure passing through the central axis. In this longitudinal section, the flared portion 1122b has two inner wall contours. , Define the intersection point of one of the contour lines and the mating part as X2 and the lowest point as X3, define the intersection point of the other contour line and the mating part as Y2 and the lowest point as Y3, with the height of the flaring part 1122b as the limit, at least A cross section Q1, the cross section Q1 and the contour line of the inner wall of the flaring portion 1122b intersect at two intersection points X1 and Y2, connect X1 and X2 to obtain a straight line, and connect Y1 and Y2 to obtain another straight line, and the two straight lines have θ The angle of θ satisfies the condition: 40°≤θ≤80°. The value of the height h4 from X1 to X2 in the vertical direction satisfies: h4≥2.5mm. The valve seat of this structure applied to the first embodiment or the second embodiment can also meet the noise requirements of the electronic expansion valve. Due to space limitations, the application of the valve seat of this embodiment to the second embodiment will not be described in detail, namely It is equivalent to adding a transition part to the valve seat of this embodiment. It should be noted that along the direction of the center axis of the valve port, the diameter of the valve port has a gradually increasing trend. The gradually increasing trend mentioned here refers to 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, but along the top-down direction, a certain section of the inner diameter is allowed to become smaller, such as a line facing the inner wall of the valve port The grooves and other situations.

Please refer to FIG. 15. FIG. 15 is a partial cross-sectional view of another valve seat structure of this application. In this expanded embodiment, the contour line of the inner wall of the flared portion 1122b is a continuous arc in the vertical and horizontal planes of the valve seat shown in the figure passing through the central axis. In this longitudinal section, the flared portion 1122b has two inner wall contours. Line, define the intersection of one of the contour lines and the mating part as X2 and the lowest point as X3, define the intersection of the other contour line and the mating part as Y2 and the lowest point as Y3, with the height of the flaring part 1122b as the limit, at least There is a cross section Q1, the cross section Q1 and the contour line of the inner wall of the flaring portion 1122b intersect at two intersection points X1 and Y2, connect X1 and X2 to obtain a straight line, and connect Y1 and Y2 to obtain another straight line. The two straight lines have The angle of θ, the angle of θ satisfies the condition: 40°≤θ≤80°. The value of the height h4 from X1 to X2 in the vertical direction satisfies: h4≥2.5mm. At this time, the line of the inner wall contour line X2 and X3 of the flaring part, and the line of Y2 and Y3 have an angle of α. At this time, X3 and Y3 are relatively closer to the outer side wall of the valve seat, and the angle of α will be greater than 80 °, but due to the presence of X1 and Y1 on the contour of the inner wall of the flared part, the angle of θ meets the condition: 40°≤θ≤80°, and satisfies h4≥2.5mm, which still has the effect of reducing noise.

The valve seat of this structure applied to the first embodiment or the second embodiment can also meet the noise requirements of the electronic expansion valve. Due to space limitations, the application of the valve seat of this embodiment to the second embodiment will not be described in detail, namely It is equivalent to adding a transition part to the valve seat of this embodiment. It should be noted that along the direction of the center axis of the valve port, the diameter of the valve port has a gradually increasing trend. The gradually increasing trend mentioned here refers to 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, but along the top-down direction, a certain section of the inner diameter is allowed to become smaller, such as a line facing the inner wall of the valve port The grooves and other situations.

The technical features recorded in the above embodiments can be permuted and combined with each other on the basis of no conflicts, so as to form more embodiments. Due to space limitations, the applicant will not list all permutations and combinations one by one. Those skilled in the art should understand that these simple combinations obviously also belong to the protection scope of the present invention without creative work.

It should be noted that the azimuth nouns such as up, down, left, and right mentioned in this article are all introduced based on the drawings in the specification for ease of description; and the "first" and "second" in the component names "" and other ordinal numbers are also introduced for the convenience of description, and do not imply any restriction on the order of the components. In addition, because the functions of some parts of the components provided in the above embodiments are the same, so This manual uses a unified naming method for these parts. The above gives a detailed introduction to the electronic expansion valve provided by the related technical solutions, and specific embodiments are used in this article to illustrate. The description of the above embodiments is only used to help understand the method and the core idea of the present invention, and is not intended to describe the present invention. Any form of restriction.

Claims

An electronic expansion valve includes a valve seat, a valve body part, a valve core, a porous part, and a guide part. The valve body part includes a valve body, and the valve body is fixedly connected to the valve seat; the valve seat includes a valve. Port, the electronic expansion valve includes a first valve chamber (A) and a second valve chamber (B), the first valve chamber (A) is located on the opposite side of the valve port (112), The valve chamber (B) is located on the relatively lower side of the valve port; the electronic expansion valve is provided with a valve port (1121) on the valve port, and the valve port (1121) can communicate with the first valve chamber (A ) And a second valve cavity (B); the electronic expansion valve has a first interface (1211) and a second interface (1221), and the first interface (1211) is in communication with the first valve cavity (A), The second interface (1221) is in communication with the second valve chamber (B); the valve core is at least partially located in the first valve chamber (A), and the valve core is matched with the valve port (1121) Used 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 interface (1221), and the diameter of the second interface (1221) is smaller than the The diameter of the second valve chamber (B); the guide member (20) is fixedly connected to the valve seat, the porous member (21) is at least mostly located in the first valve chamber (A), and the One end of the porous member (21) directly or indirectly abuts the guide member (20), and the other end of the porous member (21) is relatively abutted or fixedly connected to the valve seat.
The electronic expansion valve according to claim 1, wherein the axial direction is limited by the height of the porous member, and the space of the first valve cavity inside the porous member (21) passes through the valve port (1121) is communicated with the second valve cavity, and the space outside the porous member (21) of the first valve cavity is directly communicated with the first interface (1211), and the first interface is in direct communication with the first interface (1211). The two ports are communicated with each other through the porous component, the valve port, and the second valve cavity.
The electronic expansion valve according to claim 1, characterized in that, the porous part (21) is sintered and molded with a spherical metal material or is sintered with stainless steel wire, and the valve seat (11) is located at the valve port ( 112) is provided with an annular mounting groove (1125) on the outside, and the bottom of the porous member (21) cooperates with the mounting groove (1125) to achieve abutment or fixed connection; or, the porous member (21) One end abuts against the top of the valve seat (11) located outside the valve port (112).
The electronic expansion valve according to any one of claims 1 to 3, wherein the porous member (21) is provided with a through portion (211), and the through portion (211) penetrates the wall of the porous member , The space of the first valve cavity (A) inside the porous member (21) and the space of the first valve cavity (A) in the outer space of the porous member (21) pass through the through portion (211) Direct connection.
The electronic expansion valve according to claim 4, wherein the porous member (21) has a cylindrical shape as a whole, and the through hole (211) is opened at the top or bottom end of the porous member (21). More than one notch is formed at the top or bottom of the porous member (21).
The electronic expansion valve according to any one of claims 1-5, wherein the valve port (112) includes a mating part (1123) and a flaring part (1124), and the mating part (1123) is opposite to The flaring portion (1124) is closer to the first valve cavity (A), and the flaring portion (1124) is closer to the second valve cavity (B) relative to the mating portion (1123), The height h1 of the mating portion (1123) is smaller than the height h2 of the flaring portion (1124), and the value of h1 satisfies: 0.15mm≤h1≤0.45mm, and the flaring portion (1124) is close to the The inner diameter of one end of the first valve cavity (A) is smaller than the inner diameter of one end of the flared portion (1124) close to the second valve cavity (B).
The electronic expansion valve according to claim 6, characterized in that, with the height of the flaring portion (1124) as a limit, it is located in a longitudinal section passing through the central axis of the valve seat (11), and the flaring portion ( 1124) There are two inner wall contour lines, the highest point of one of the inner wall contour lines is defined as X2, and the highest point of the other inner wall contour line is defined as Y2, the flaring part (1124) has at least one cross section Q1, the The cross-section Q1 and the two inner wall contour lines of the flared portion (1124) intersect at X1 and Y1 respectively, then there is an angle θ between the connecting line of X1 and X2 and the connecting line of Y1 and Y2, and the value of θ satisfies : 40°≤θ≤80°, and the value of h2 satisfies: 2.5mm≤h2≤6.5mm.
The electronic expansion valve according to any one of claims 6-7, characterized in that, along the longitudinal section of the valve port (112) passing through the central axis, the inner wall of the flared portion (1124) has Two contour lines, the two contour lines are straight lines, the lowest point of one of the inner wall contour lines is defined as X3, and the lowest point of the other inner wall contour line is defined as Y3, then the connecting line of X2 and X3, the connecting line of Y2 and Y3 There is an angle α between the connecting lines, and the value of the angle α satisfies: 40°≤α≤80°.
The electronic expansion valve of claim 8, wherein the valve port portion further comprises a protruding portion (1128) and a tail portion (1129), and the protruding portion (1128) faces the center of the valve port portion The axial direction is convex, and along the longitudinal section of the valve port, the inner wall of the tail portion (1129) is located at an angle between 50° and 70° on the extension line of the longitudinal section.
7. The electronic expansion valve of claim 6, wherein the flaring portion extends to the bottom end of the valve port, and the height h1 of the mating portion is smaller than the height h2 of the flaring portion, and the The value of h1 satisfies: 0.25mm≤h1≤0.35mm, the value of h2 satisfies: 4.5mm≤h2≤6.5mm, the diameter H1 of the second valve cavity (B) satisfies: 9mm≤H1≤30mm, so The through diameter H1 of the second valve cavity (B), the through diameter H3 of the first port 1211, and the through diameter H2 of the second port 1221 satisfy the conditions: H1≥1.3H3, H1≥1.3H2.