Electronic expansion valve

Abstract

An electronic expansion valve includes a first valve chamber and a second valve chamber, located above and below the valve port, respectively. At least part of the valve core is located in the first valve chamber, and a filter element is provided in the second valve chamber. When the refrigerant in the electronic expansion valve flows in the first flow direction, the refrigerant flows through the filter element after passing through the valve port, which can improve the refrigerant flow after passing through the valve port and reduce the refrigerant flow noise, thereby meeting the noise reduction requirements of some systems.

Description

[Technical Field]

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

[0002] The 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. However, some noise may be generated when the refrigerant passes through the electronic expansion valve. Improving the noise level of the refrigerant passing through the electronic expansion valve has been a long-standing research topic for engineers working with electronic expansion valves and refrigeration systems. [Summary of the Invention]

[0003] The purpose of this application 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, the following technical solution is adopted:

[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 A and a second valve chamber B. The first valve chamber A is located on a side opposite to the valve port, and the second valve chamber B is located on a side opposite to the valve port. The electronic expansion valve has a valve port at the valve port, through which the first valve chamber A can communicate with the second valve chamber B. 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 regulate the flow rate of the electronic expansion valve. The diameter D 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 electronic expansion valve also has a filter element below the valve port, which is relatively close to the valve port.

[0006] By setting a first valve chamber and a second valve chamber on both sides of the valve port of the electronic expansion valve, and setting a filter element in the flow channel between the valve port and the second interface, with the filter element relatively close to the valve port, the refrigerant throttled through the valve port will pass through the filter element when the electronic expansion valve is in the first flow direction. This can improve the flow state of the refrigerant after throttling in the first flow direction, thereby improving the noise of the refrigerant passing through the electronic expansion valve in this direction. [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 A partially enlarged schematic diagram of the electronic expansion valve shown;

[0009] Figure 3 for Figure 1 A partial cross-sectional schematic diagram of another embodiment of the electronic expansion valve shown.

[0010] Figure 4 A partial cross-sectional schematic diagram of an electronic expansion valve according to another embodiment;

[0011] Figure 5 A cross-sectional schematic diagram of an electronic expansion valve according to another embodiment;

[0012] Figure 6 A partial cross-sectional schematic diagram of an electronic expansion valve according to another embodiment;

[0013] Figures 7-9 for Figure 1 The schematic diagram of the flow deflector shown is as follows. Figure 7 This is a sectional view. Figure 8 This is a top-down view. Figure 9 This is a three-dimensional schematic diagram;

[0014] Figure 10 This is a cross-sectional view of the electronic expansion valve according to the second embodiment;

[0015] Figure 11 This is a cross-sectional schematic diagram of another structure in the second embodiment;

[0016] Figure 12 This is a partial structural diagram of an electronic expansion valve, including the valve body and valve seat, according to another embodiment.

[0017] Figures 13-15 This is a partial structural diagram of an electronic expansion valve.

[0018] In the diagram: 11, 11a, 11b, 11c, 11' valve seats; 1110 gradually expanding zone; 112, 112', 112a, 112b, 112c valve ports; 1121 valve port; 1122 lower wall; 112c1, 11221 first part; 112c2, 11222 second part.

[0019] 121 First takeover, 122 Second takeover.

[0020] 130 flow baffle, 1301 mating part, 1302 protrusion, 1303 connecting part, 1304 through hole.

[0021] 131 filter assembly, 1311 filter layer,

[0022] 135, 135' porous sintered parts, 1351 protrusion,

[0023] 14, 14' Valve body component, 140 Limiting protrusion, 141 Valve body, 1411 Side wall portion, 1412 Flanged portion, 1413 Bottom wall portion,

[0024] 15 connectors, 16 sleeves

[0025] 17 Magnetic rotor assembly, 171 Magnetic rotor, 172 Connecting plate

[0026] 18. Lead screw valve core assembly, 181 lead screw, 182 valve core, 183 sleeve section, 184 sleeve cover, 185 fixing component, 186 spring, 187 support component.

[0027] 19 Nut Assembly, 191 Nut, 192 Connector

Detailed Implementation Methods

[0028] 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.

[0029] It should be noted that the following technical solutions describe a specific electronic expansion valve structure. This application mainly focuses on improving the flow channel structure of the refrigerant to reduce refrigerant flow noise, specifically through improvements to the structure of the valve seat and valve body components. Descriptions of other components of the electronic expansion valve, such as the magnetic rotor assembly, lead screw valve core assembly, nut assembly, and stop device, are merely for understanding the basic working principle of the electronic expansion valve and are not intended to impose structural limitations. This application does not specifically 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.

[0030] Please refer to Figures 1-3 , 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 an electronic expansion valve, mainly including the valve seat and valve body components.

[0031] 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 is fixedly connected to the valve body 141 by welding, and is also fixedly connected to the first connecting pipe 121 and the second connecting pipe 122. Figure 1As shown, a connector 15 is provided on one side above the valve seat 11. The connector is roughly cup-shaped with an open bottom. The connector is fixedly connected to the valve seat 11 and also 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.

[0032] 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.

[0033] The magnetic rotor assembly 17 can rotate 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 that is fixedly connected to or integrally formed with the magnetic rotor 171. 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.

[0034] The lead screw valve core assembly also includes a valve core 182, a sleeve portion 183, a sleeve cover 184, a fixing member 185, a spring 186, and a support member 187. The lead screw 181 and the valve core 182 are floatingly connected through a sleeve. The sleeve includes a sleeve portion 183 and a sleeve cover 184. The sleeve portion 183 is generally cup-shaped with an open bottom. The valve core 182 passes through the opening and is limited by the sleeve portion 183. At least part of the valve core 182 is located in the first valve chamber A. When the electronic expansion valve is working, the valve core 182 can move a certain stroke relative to the valve port under the drive, thereby cooperating with the valve port 1121 for regulating throttling. 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 of the valve port 1121. When the valve core abuts against the valve port 112, the valve core 182 can move relative to the sleeve 183 within a certain range to overcome the spring force, but will not disengage from the sleeve. A sleeve cover 184 is provided on the top of the sleeve portion 183. The sleeve portion 183 and the sleeve cover 184 are fixed or limited relative to each other. The sleeve cover 184 is provided with an abutment portion. A fixing member 185 is fixedly connected to the lower end of the lead screw 181. A wing is provided on the fixing member 185. A spring 186 is also provided on the side of the wing facing the valve core and is supported by a support member 187. One end of the spring 186 abuts against the side of the wing facing the valve core, and the other end abuts against the support member 187. During assembly, the lead screw 181 passes through the sleeve cover 184. The fixing member 185 is fixedly connected to the lead screw 181 and then assembled with the sleeve portion 183. The sleeve cover 184 is then assembled with the sleeve portion 183. In this way, the abutment portion of the sleeve cover 184 and the wing of the fixing member 185 are arranged opposite each other to form a limiting structure, and at the same time, the sleeve and the lead screw 181 form a floating connection structure similar to suspension. The sleeve portion 183 and the lead screw 181 cannot be disengaged. Due to the action of the spring, they can make a certain stroke of relative movement when the valve core and the valve port portion 112 abut. The disengagement mentioned in this article refers to the separation of the sleeve portion 183 and the lead screw 181 into two separate parts that are not restricted to each other, and not merely to the absence of physical contact between the two.

[0035] The nut assembly 19 includes a nut 191 and a connector 192. The nut 191 is fixedly connected to the connector 192. The connector 192 can be formed by stamping a metal sheet. The nut 191 is fixedly mounted to the sleeve 16 and / or the connector 15 via the metal connector 192. The nut 191 can be made of non-metallic material and injection molded with the connector 192 as an insert. The connector 192 and the connector 15 can be fixedly connected by welding. When the connector is not provided, the connector 192 can be fixedly connected to the valve seat 11 or the sleeve by welding.

[0036] 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.

[0037] 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 space above the valve port portion 112 and the part that communicates with the first interface 1211 of the first connecting pipe 121 is the first valve chamber A, and the valve chamber space below the valve port portion and the part that communicates with 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 1121. The first valve chamber A is located on the side opposite to the upper part of the valve port portion 112, and the second valve chamber B is located on the side opposite to the lower part 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 document, 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 in this specification refers to the diameter at the relatively largest point.

[0038] 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.

[0039] In this embodiment, the thickness of the valve port portion 112 gradually increases radially outward from the valve port portion 1121. That is, the wall thickness h of the valve port portion 112 at the valve port is relatively thinnest. The wall thickness h of the valve port portion 112 at the valve port is the relatively smallest wall thickness of the valve port portion. In other words, h is the height of the valve port. The wall thickness of the valve port 112 gradually increases radially outwards. The wall thickness h of the valve port 112 at the valve port is less than the wall thickness H of the valve port 112 further away from the valve port. This allows for a corresponding reduction in the wall thickness h of the valve port 112 at the valve port, making it suitable for a range of 0.25mm-0.45mm, or even 0.25mm-0.4mm. The wall thickness of the valve port increases from the inside out. In other words, the lower wall 1122 of the valve port is roughly trumpet-shaped. For example, when viewed from a cross-section formed through the center, the extension line of the lower wall 1122 forms an angle approximately α. Figure 2 α is between 100° and 140° or between 110° and 130°. Thus, when the refrigerant flows in the first flow direction, it passes through valve port 1121 and then through the flared diffuser zone 1110, allowing the refrigerant to diffuse to both sides, reducing interference in the middle and improving noise during the first flow direction. Specifically, the channel space of the electronic expansion valve in valve port 112 includes the space formed by valve port 1121 and valve core, and the space formed by diffuser zone 1110 and valve core. When the refrigerant flows in the first flow direction, it first flows through valve port 1121, then through diffuser zone 1110, and finally into the second valve chamber B.

[0040] The electronic expansion valve includes a valve seat 11 and a valve body component 14. The valve body component 14 includes a valve body 141 and a filter element. In this embodiment, the filter element includes a filter screen assembly 131. The filter screen assembly 131 is fitted with the valve body 141 through a transition fit, an interference fit, or a small clearance fit. Thus, the upper and lower parts of the filter screen assembly 131 are separated by the filter screen assembly, and the refrigerant passes through the filter screen assembly 131 to the space between the upper and lower parts of the filter screen assembly 131. The filter screen assembly 131 can be limited by the limiting protrusion 140 of the valve body. The filter screen assembly 131 is located in the second valve chamber B and is relatively close to the valve port 112. Specifically, the distance L1 between the filter screen assembly 131 and the bottom wall 1413 of the valve body is greater than the distance L2 between the filter screen assembly 131 and the valve port 112, and the distance L2 between the filter screen assembly and the valve port is not greater than one-third of the distance L between the valve port 112 and the bottom wall 1413 of the valve body. The filter assembly 131 includes a filter layer 1311, which is composed of multiple layers of filter mesh. These layers can be formed by welding or by pressing and then partially welding, such as consisting of 3 or more layers of stainless steel filter mesh, 5 or 7 layers. The filter mesh can be a specific type of filter mesh. The filter assembly 131 can include 1 to 5 filter layers, such as 2 or 3 layers. The filter assembly 131 has a transition fit, interference fit, or small clearance fit with the valve body 141. The valve body 141 also has a limiting protrusion 140 on its side wall 1411. The limiting protrusion can be a dotted or grooved inward-facing groove structure to limit or fix the filter assembly; that is, the filter assembly is limited or fixed to the side wall 1411 of the valve body. The protrusion and concave are relative terms; the protrusion is convex to the filter assembly but concave from the outside. The filter assembly 131 is located below the valve port 112. This allows the refrigerant to flow from the first valve chamber A to the second valve chamber B, passing through the valve port 1121 and the diffuser zone 1110 before passing through the filter assembly 131. The filter assembly 131 alters the refrigerant flow pattern. Combined with the second valve chamber, the filter assembly reduces refrigerant flow noise in the electronic expansion valve. Furthermore, the diffuser zone further enhances the noise reduction. Additionally, the valve port structure can be varied in several ways, such as... Figure 3As shown, the lower wall of the valve port 112', viewed in cross-section, comprises a first part 11221 and a second part 11222. The two parts have different inclination angles; that is, the inclination angle of the first part 11221 in the cross-section is different from that of the second part 11222 in the cross-section. The lower wall of the valve port is also roughly funnel-shaped. The thickness of the valve port 112' gradually increases radially outward from the part closest to the valve port 1121. The wall thickness h of the valve port 112' is relatively thinnest near the valve port, while the thickness gradually increases radially outward. The wall thickness h of the valve port 112' near the valve port is less than the wall thickness H of the valve port 112' farther from the valve port. In other words, the electronic expansion valve also has a gradually expanding region 1110 at the valve port. After passing through the valve port 1121, the refrigerant diffuses in the gradually expanding region 1110, which helps to improve refrigerant noise. 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 112', and the second valve chamber B is located on the lower side of the valve port 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. The through diameter H3 of the first interface 1211 is smaller than the through diameter H1 of the second valve chamber B. The filter assembly 131 is located in the second valve chamber B and is relatively close to the valve port 112. Specifically, the distance L1 between the filter assembly 131 and the bottom wall 1413 of the valve body is greater than the distance L2 between the filter assembly 131 and the valve port 112.

[0041] The filter components can also be modified, such as... Figure 4As shown, the filter assembly 131 is located in the second valve chamber B and is relatively close to the valve port 112. The filter assembly 131 includes a filter layer 1311 and a shaped filter layer 1312. The filter layer 1311 is composed of multiple layers of filter mesh, which can be formed by welding or by pressing and then partially welding, such as 3 or more layers, 5 or 7 layers of stainless steel filter mesh. The shaped filter layer 1312 is also composed of multiple layers of stainless steel filter mesh, which can be formed by pressing and then welding. The shaped filter layer 1312 has 3 or more layers of filter mesh, such as 5 or 6 layers. The shaped filter layer 1312 has a protrusion 1310 protruding towards the valve port. The protrusion 1310 serves to block or guide the flow and is arranged protruding towards the valve port 1121 or opposite to the valve core. The filter assembly 131 is fitted with the valve body with a transition fit, interference fit, or small clearance fit, and is limited by the protrusion or protrusion point, so that it can be installed without the need for other parts. Alternatively, an outer cap can be fitted onto the protrusion 1310 of the shaped filter layer 1312, with the outer cap facing the valve core. The shape of the outer cap can match the protrusion 1310, and the outer cap can be fixed to the filter assembly, such as by welding. The outer cap also serves as part of the protrusion, acting as a flow deflector or guide. Alternatively, a matching inner cap can be placed between the shaped filter layer 1312 and the filter layer 1311, with the inner cap matching the protrusion to act as a flow deflector. This can relatively reduce the proportion of refrigerant passing through the middle of the filter assembly, and, combined with the second valve chamber, improve refrigerant flow noise. It also relatively reduces interference in the middle. The filter assembly can also include two shaped filter layers, or it can be composed entirely of shaped filter layers.

[0042] Another embodiment is described below, see reference. Figure 5 , Figure 5 This is a cross-sectional schematic diagram of another structure of the electronic expansion valve. (Compared to...) Figure 1The main difference in the illustrated embodiment is that the electronic expansion valve also has a flow-blocking member 130 in the second valve chamber B. 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 body component 14 includes a valve body 141, a flow-blocking member 130, and a filter assembly 131. The flow-blocking member 130 includes a mating part 1301, a protrusion 1302, and a connecting part 1303. In addition, the flow-blocking member 130 has a through hole 1304 for refrigerant to flow through. The flow-blocking member 130 and the filter assembly 131 are located in the second valve chamber B. The flow-blocking part 1302 is arranged facing the valve port or opposite to the valve core. The maximum size of the protrusion 1302 is larger than the diameter D of the valve port 1121. The valve body 141 can be made of stainless steel. For example, if the valve body is formed from stainless steel sheet or pipe through stretching, stamping, or extrusion, the wall thickness of the valve body can be less than 1 mm. The distance L from the bottom wall 1413 of the valve body to the valve port 121 is more than twice the diameter H2 of the second connecting pipe 122. The diameter H2 of the second port is greater than the diameter D of the valve port, the diameter H1 of the second valve cavity B is greater than the diameter H2 of the second port connected to the second connecting pipe, the diameter H1 of the second valve cavity B is greater than the diameter H3 of the first port connected to the first connecting pipe, and the diameter H2 of the second port connected to the second connecting pipe is greater than the diameter D of the valve port 121. In this embodiment, the filter assembly 131 is located below the flow-blocking member 130. The flow-blocking member 130 is fitted with the valve body via a transition fit or interference fit, while the filter assembly 131 is fitted with the valve body via a transition fit, interference fit, or small clearance fit. It is limited by a limiting protrusion 140 on the side wall of the valve body. Thus, when the refrigerant flows into the throttling device from the first connecting pipe 121, it first passes through the valve port 1121, the expanding port 1110, through the through hole of the flow-blocking member 130, and then through the filter assembly 131. Alternatively, the filter assembly and the flow-blocking member can be combined and then assembled into the valve body. For example, the filter assembly can have a central hole, allowing it to be fitted onto the protrusion of the flow-blocking member through the central hole, and positioned above the through hole of the flow-blocking member. Figure 6 As shown.

[0043] The baffle 130 can have various specific structures. The following example illustrates one such structure. Figures 7-9The flow-blocking component 130 includes a mating portion 1301, a protrusion 1302, and a connecting portion 1303. Additionally, the flow-blocking component 130 has a through-hole 1304 for refrigerant flow. The mating portion 1301 is used to fix or limit the refrigerant flow to the inner wall of the valve body. The connecting portion 1303 connects the protrusion 1302 and the mating portion. There can be one or more through-holes 1304; in this embodiment, there are three through-holes 1304 for refrigerant flow. Correspondingly, there are three connecting portions 1303. The protrusion 1302 is generally cap-shaped, protruding towards the valve port or valve core. The protrusion allows the refrigerant to flow laterally more when flowing from the valve port to the second valve chamber B, reducing the flow in the middle section and improving the refrigerant flow pattern in this middle section. This reduces confluence and interference, and, combined with the second valve chamber, improves refrigerant noise. The electronic expansion valve has a protrusion in the second valve chamber B, or the electronic expansion valve has a protrusion, at least part of which is below the valve port. The protrusion 1302 protrudes towards the valve port, or the protrusion 1302 has a protrusion facing the valve core. In this embodiment, the portion O of the protrusion 1302 near the valve port 1121 is relatively small, while the portion M of the protrusion 1302 relatively far from the valve port 1121 is relatively large. The maximum portion M of the protrusion 1302 can be larger than the valve port diameter D, or the protrusion 1302 gradually increases in size from the portion O relatively near the valve port 1121 to the portion M relatively far from the valve port 1121. The valve body 141 also has a limiting protrusion 140 on its side wall portion 1411. The limiting protrusion can be a dotted or grooved inward groove structure to limit or fix the flow-blocking member, that is, the flow-blocking member is limited or fixed to the side wall portion 1411 of the valve body. Additionally, the valve body 141 has an inwardly flanged portion 1412 on its side wall 1411 to facilitate connection with the second connecting pipe 122. The protrusion is positioned opposite the valve core or facing the valve port, specifically at a directly opposite location, to improve the flow of refrigerant fluid in the middle and reduce refrigerant noise. When the valve core is at the valve port, the protrusion faces the valve core; when the valve core is not at the valve port, the protrusion faces the valve port. Furthermore, the protrusion can be generally streamlined to reduce refrigerant flow resistance. When the valve core abuts against the valve port, the position of the protrusion ensures that it does not contact the valve core but is relatively close to it. The structure of the protrusion is not limited to the top-smaller-bottom-larger structure of this embodiment; it can also be a structure with approximately the same size at the top and bottom. The flow-blocking component can be formed by stamping from a metal material such as stainless steel, or by injection molding from a plastic material. Alternatively, the flow-blocking component can be a tubular structure, such as a tubular component formed by stretching, fixed or limited to the bottom or side wall of the valve body by other components.

[0044] The valve body 141 can be made of stainless steel, such as stainless steel sheet or pipe formed by stretching, stamping or extrusion; the wall thickness of the valve body is less than 1 mm; the distance L from the bottom wall 1413 of the valve body to the valve port 121 is more than twice the diameter H2 of the second interface 1221, so that the second valve cavity has a certain space.

[0045] The second embodiment is described below, see reference. Figure 10 , Figure 11 , Figure 10 , Figure 11 This is a schematic diagram of the structure of two electronic expansion valves according to the second embodiment. The electronic expansion valve has a porous sintered element 135' provided in the second valve chamber B. As a filter element, the porous sintered element 135' is located opposite the valve port 112. The porous sintered element 135' is approximately cylindrical and mates with the inner wall of the side wall of the second valve chamber. For example, the porous sintered element 135' can be fitted with the valve body with a transition fit or a small clearance fit, and can be limited by a limiting protrusion or point provided on the side wall of the valve body. Alternatively, it can be limited by a flanged portion 1412 as shown in the figure. Thus, when the refrigerant flows in and is throttled from the first connecting pipe 121, it first flows through the valve port 1121, the gradually expanding port 1110, through the porous sintered element 135', and then out of the electronic expansion valve through the second interface 1221. Additionally, a flow-blocking element can be provided in the second valve chamber. The porous sintered part is relatively close to the valve port 112, and the distance L2 between the porous sintered part and the valve port 112 is not greater than one-third of the distance L between the valve port 112 and the bottom wall 1413 of the valve body: L2≤1 / 3*L.

[0046] Furthermore, the structure of the porous sintered part can be modified, and is not limited to the cylindrical shape mentioned above. The porous sintered part 135 has a protrusion 1351 and a base 1350, which can be integral. The protrusion 1351 is generally conical, cap-shaped, cylindrical, or frustum-shaped. If the protrusion 1351 is conical, it is relatively smaller near the valve core and relatively larger towards the base. The protrusion 1351 protrudes from the base 1350 toward the valve port. The protrusion 1351 is located below the valve port and is positioned opposite to or toward the valve core. The protrusion 1351 is a protruding structure that generally protrudes from below toward the valve port, which allows most of the refrigerant to flow laterally when it flows from the valve port to the second valve chamber B, reducing the proportion that flows through the middle.

[0047] Another implementation method is described below, see reference. Figure 12The valve seat 11' does not have a gradually expanding zone. 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 body component 14 includes a valve body 141, a flow-blocking member 130, and a filter assembly 131. The flow-blocking member 130 includes a mating part 1301, a protrusion 1302, and a connecting part 1303. Additionally, the flow-blocking member 130 has a through hole 1304 for refrigerant flow. The flow-blocking member 130 and the filter assembly 131 are located in the second valve chamber B. The protrusion 1302 is positioned towards the valve port or opposite the valve core; the maximum size of the protrusion 1302 is larger than the diameter D of the valve port 1121. The filter assembly 131 is located in the second valve chamber B and is relatively close to the valve port 112. Specifically, the distance L1 between the filter assembly 131 and the bottom wall 1413 of the valve body is greater than the distance L2 between the filter assembly 131 and the valve port 112. The valve body 141 can be made of stainless steel. For example, the valve body can be formed by stretching, stamping, or extruding stainless steel plates or pipes, so the wall thickness of the valve body can be less than 1 mm. The distance L from the bottom wall 1413 of the valve body to the valve port 121 is more than twice the diameter H2 of the second connecting pipe 122. The diameter H2 of the second port is greater than the diameter D of the valve port, the diameter H1 of the second valve cavity B is greater than the diameter H2 of the second port connected by the second connecting pipe, the diameter H1 of the second valve cavity B is greater than the diameter H3 of the first port connected by the first connecting pipe, and the diameter H2 of the second port connected by the second connecting pipe is greater than the diameter D of the valve port 1121. In this embodiment, the filter assembly 131 is located below the flow baffle 130. The flow baffle 130 is fitted with the valve body with a transition fit or an interference fit. The filter assembly 131 is fitted with the inner wall of the second valve cavity of the valve body with a transition fit, an interference fit, or a small clearance fit, and is limited by the limiting protrusion 140 provided on the side wall of the valve body. When the refrigerant flows into the throttling device from the first connecting pipe 121, it first passes through the valve port 1121, then through the through hole of the baffle 130, and then through the filter assembly 131.

[0048] Alternatively, the filter assembly can be combined with the flow baffle and then assembled into the valve body. For example, the filter assembly can have a central through-hole, which fits over the protrusion of the flow baffle, positioning the filter assembly above the through-hole of the flow baffle. Figures 13-15 As shown.

[0049] The structure of the valve port in the above embodiment can be modified in some ways, such as... Figures 13-15 The implementation method shown. Figure 13The valve seat 11a of the illustrated embodiment differs from the above embodiment mainly in the structure of the valve port 112a. The lower wall of the valve port 112a, in the cross-section formed through the center, has an outwardly convex arc shape, roughly funnel-shaped. The thickness of the valve port 112a gradually increases radially outward from the valve port 1121, but the increase is faster closer to the center, decreasing from the center outward. The wall thickness h of the valve port 112a is relatively thinnest near the valve port, gradually increasing radially outward. The wall thickness h of the valve port 112a at the valve port is less than the wall thickness H of the valve port 112a further away from the valve port. In this way, the wall thickness h of the valve port 112a at the valve port can be reduced accordingly. For example, the wall thickness h of the valve port 112a at the valve port can be between 0.25mm and 0.45mm, or between 0.25mm and 0.4mm. The wall thickness of the valve port gradually increases from the inside to the outside. That is, the electronic expansion valve also has a gradually expanding area 1110 at the valve port. After passing through the valve port 1121, the refrigerant can diffuse to the peripheral area, which can help improve the refrigerant noise.

[0050] like Figure 14 The electronic expansion valve can also adopt the structure of another valve seat 11b. Correspondingly, the lower wall of the valve port 112b, viewed in cross-section, is a concave arc shape, or in other words, the lower wall of the valve port is roughly trumpet-shaped. The thickness of the valve port 112b gradually increases radially outward from the valve port 1121. The wall thickness h of the valve port 112b at the valve port is relatively the thinnest, while the thickness gradually increases radially outward. The wall thickness h of the valve port 112b at the valve port is significantly smaller than the wall thickness H of the valve port 112b away from the valve port.

[0051] Furthermore, the lower wall of the valve port can also be a combination of several structures, such as a combination of different slopes when viewed in cross-section, or a combination of arcs and diagonal lines, etc. For example... Figure 15 In cross-section, the lower wall of valve port 112c comprises a first part 112c1 and a second part 112c2. The first part 112c1 has an outwardly convex arc shape in cross-section, while the extension line of the second part 112c2 forms an angle, thus giving the lower wall of the valve port a roughly trumpet shape. The thickness of valve port 112c gradually increases radially outward from valve port 1121. The wall thickness h of valve port 112c is relatively thinnest at the valve port, gradually increasing radially outward. The wall thickness h of valve port 112c at the valve port is less than the wall thickness H further away from the valve port. That is, the electronic expansion valve also has a gradually expanding zone 1110 at the valve port, allowing the refrigerant to diffuse to the surrounding area after passing through valve port 1121, which helps improve refrigerant noise. The shape of the valve port is only an example and is not a limitation on the technical solution.

[0052] The electronic expansion valve provided in this application, through its two valve chambers—a first valve chamber located above the valve port and a second valve chamber located below—ensures a filter element is installed in the second valve chamber. After the refrigerant is throttled through the valve port, the throttled refrigerant passes through the filter element, altering the refrigerant's flow pattern and relatively reducing refrigerant interference. This improves refrigerant flow noise, thus reducing the noise of the refrigerant passing through the electronic expansion valve and addressing the long-standing problem of refrigerant noise. This differs significantly from conventional thinking, where even if a filter element is installed, it is usually placed relatively far from the valve port, such as in a connecting pipe. This application places the filter element relatively close to the valve port, thereby improving refrigerant flow noise. The valve body of the above embodiment can be formed from stainless steel through stretching or extrusion, or from sheet metal or tubing, making manufacturing relatively convenient.

[0053] The "bore diameter" mentioned in this article refers to a cross-section that is not limited to circular. For example, the cross-section of a 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 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 pipe, and the bore diameter H2 of the second interface connected to the second 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 point 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.

[0054] It should be noted that the directional terms such as "up," "down," "left," and "right" mentioned in this embodiment are all introduced for ease of description based on the accompanying drawings; and 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 method 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 text for illustration. The description of the above embodiments is only for helping to understand the method and core idea of ​​the present invention and is 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, and the first valve chamber (A) can communicate with the second valve chamber (B) through the valve port (1121); the electronic expansion valve has a first interface (1211) and a second... The electronic expansion valve has an interface (1221), the first interface (1211) being connected to the first valve chamber (A), and the second interface (1221) being connected to 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 regulate the flow rate of the electronic expansion valve; the diameter (D) 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 diameter of the second valve chamber (B); the electronic expansion valve is also provided with a filter element below the valve port, and the filter element is relatively close to the valve port. The filter element includes a filter screen assembly (131), and the valve body component includes the filter element. The filter screen assembly includes a filter screen layer (1311) and a shaped filter screen layer (1312). The shaped filter screen layer is located in the second valve cavity or at least partially located in the second valve cavity. The shaped filter screen layer includes multiple layers of stainless steel filter screen. The shaped filter screen layer (1312) includes a protrusion (1310) that protrudes toward the valve port and is disposed opposite to the valve core. The shaped filter screen layer is fitted with the inner wall of the side wall portion of the valve body through a transition fit, an interference fit, or a small clearance fit. The shaped filter screen layer is fixed by pressing, welding, or pressing and welding. An outer cap is fitted onto the protrusion (1310) of the irregular filter layer (1312), so that the outer cap is positioned opposite the valve core; or, an inner cap with a matching shape is provided between the irregular filter layer (1312) and the filter layer (1311), and the inner cap fits the protrusion. The second interface (1221) is located on the peripheral sidewall of the valve body (141).

2. The electronic expansion valve according to claim 1, characterized in that, The filter element being relatively close to the valve port includes the following: the distance (L1) between the filter element and the bottom wall (1413) of the valve body is greater than the distance (L2) between the filter element and the valve port, and the distance (L2) between the filter element and the valve port is not greater than one-third of the distance (L) between the valve port and the bottom wall (1413) of the valve body.

3. The electronic expansion valve according to claim 1 or 2, characterized in that, The filter assembly is located in the second valve cavity or at least partially located in the second valve cavity; the filter assembly includes at least two filter layers (1311), the filter layers include at least three stainless steel filter layers, or the filter assembly includes at least ten stainless steel filter layers, or the filter assembly includes at least three filter layers (1311), the filter layers include at least five stainless steel filter layers; the filter assembly is fitted with the inner wall of the side wall of the valve body through a transition fit, interference fit, or small clearance fit; the filter layers are fixed by pressing or welding, or by pressing and welding.

4. The electronic expansion valve according to claim 1 or 2, characterized in that, The electronic expansion valve includes a first connecting pipe (121) and a second connecting pipe (122). The first connecting pipe is provided with the first interface (1211), and the second connecting pipe is provided with the second interface (1221). The valve seat (11) also includes a peripheral wall portion. The first connecting pipe (121) and the valve seat (11) are fixedly connected to the peripheral wall portion of the valve seat by welding. The first interface (1211) is directly connected to the first valve cavity (A). The valve body includes a flange portion (1412). The second connecting pipe (122) and the valve body are fixedly connected to the flange portion by welding. The second interface (1221) is connected to the second valve cavity (B).

5. The electronic expansion valve according to claim 1 or 2, characterized in that, The electronic expansion valve is further provided with a gradually expanding region (1110) at the valve port. The cross-sectional area of ​​the gradually expanding region near the second valve cavity is larger than the cross-sectional area of ​​the gradually expanding region near the valve port. The gradually expanding region is relatively closer to the second valve cavity than the valve port. The valve port is located between the gradually expanding region and the first valve cavity. The gradually expanding region is located between the valve port and the second valve cavity. The wall thickness (h) of the valve port near the valve port is smaller than the wall thickness (H) of the valve port relatively far from the valve port. The wall thickness (h) of the electronic expansion valve near the valve port is between 0.25mm and 0.45mm.

6. The electronic expansion valve according to claim 3, characterized in that, The electronic expansion valve is further provided with a gradually expanding region (1110) at the valve port. The cross-sectional area of ​​the gradually expanding region near the second valve cavity is larger than the cross-sectional area of ​​the gradually expanding region near the valve port. The gradually expanding region is relatively closer to the second valve cavity than the valve port. The valve port is located between the gradually expanding region and the first valve cavity. The gradually expanding region is located between the valve port and the second valve cavity. The wall thickness (h) of the valve port near the valve port is smaller than the wall thickness (H) of the valve port relatively far from the valve port. The wall thickness (h) of the electronic expansion valve near the valve port is between 0.25mm and 0.45mm.

7. The electronic expansion valve according to claim 4, characterized in that, The electronic expansion valve is further provided with a gradually expanding region (1110) at the valve port. The cross-sectional area of ​​the gradually expanding region near the second valve cavity is larger than the cross-sectional area of ​​the gradually expanding region near the valve port. The gradually expanding region is relatively closer to the second valve cavity than the valve port. The valve port is located between the gradually expanding region and the first valve cavity. The gradually expanding region is located between the valve port and the second valve cavity. The wall thickness (h) of the valve port near the valve port is smaller than the wall thickness (H) of the valve port relatively far from the valve port. The wall thickness (h) of the electronic expansion valve near the valve port is between 0.25mm and 0.45mm.

8. The electronic expansion valve according to claim 1 or 2, characterized in that, The electronic expansion valve also has a gradually expanding region (1110) at the valve port. The gradually expanding region is approximately funnel-shaped, and the cross-sectional area of ​​the gradually expanding region near the second valve cavity is larger than the cross-sectional area of ​​the gradually expanding region near the valve port. The valve port is located between the gradually expanding region and the first valve cavity, and the gradually expanding region is located between the valve port and the second valve cavity. The gradually expanding region is relatively closer to the second valve cavity than the valve port, and the wall thickness (h) of the valve port near the valve port is smaller than the wall thickness (H) of the valve port relatively far from the valve port. The wall thickness (h) of the valve port near the valve port is between 0.25mm and 0.45mm; the valve port gradually increases in size from the part relatively close to the valve port (1121) to the part farther away from the valve port (1121); the valve port includes a portion whose lower wall forms an angle α on the extension line of the cross-section formed through the center, where α satisfies: 100°≤α≤140° or 110°≤α≤130°; the valve body is made of stainless steel and is formed by stretching, stamping or extruding stainless steel sheet or pipe; the wall thickness of the valve body is less than 1mm; the distance (L) from the bottom wall (1413) of the valve body to the valve port is more than twice the diameter (H2) of the second connecting pipe (122).

9. The electronic expansion valve according to claim 3, characterized in that, The electronic expansion valve also has a gradually expanding region (1110) at the valve port. The gradually expanding region is approximately funnel-shaped, and the cross-sectional area of ​​the gradually expanding region near the second valve cavity is larger than the cross-sectional area of ​​the gradually expanding region near the valve port. The valve port is located between the gradually expanding region and the first valve cavity, and the gradually expanding region is located between the valve port and the second valve cavity. The gradually expanding region is relatively closer to the second valve cavity than the valve port, and the wall thickness (h) of the valve port near the valve port is smaller than the wall thickness (H) of the valve port relatively far from the valve port. The wall thickness (h) of the valve port near the valve port is between 0.25mm and 0.45mm; the valve port gradually increases in size from the part relatively close to the valve port (1121) to the part farther away from the valve port (1121); the valve port includes a portion whose lower wall forms an angle α on the extension line of the cross-section formed through the center, where α satisfies: 100°≤α≤140° or 110°≤α≤130°; the valve body is made of stainless steel and is formed by stretching, stamping or extruding stainless steel sheet or pipe; the wall thickness of the valve body is less than 1mm; the distance (L) from the bottom wall (1413) of the valve body to the valve port is more than twice the diameter (H2) of the second connecting pipe (122).

10. The electronic expansion valve according to claim 4, characterized in that, The electronic expansion valve also has a gradually expanding region (1110) at the valve port. The gradually expanding region is approximately funnel-shaped, and the cross-sectional area of ​​the gradually expanding region near the second valve cavity is larger than the cross-sectional area of ​​the gradually expanding region near the valve port. The valve port is located between the gradually expanding region and the first valve cavity, and the gradually expanding region is located between the valve port and the second valve cavity. The gradually expanding region is relatively closer to the second valve cavity than the valve port, and the wall thickness (h) of the valve port near the valve port is smaller than the wall thickness (H) of the valve port relatively far from the valve port. The wall thickness (h) of the valve port near the valve port is between 0.25mm and 0.45mm; the valve port gradually increases in size from the part relatively close to the valve port (1121) to the part farther away from the valve port (1121); the valve port includes a portion whose lower wall forms an angle α on the extension line of the cross-section formed through the center, where α satisfies: 100°≤α≤140° or 110°≤α≤130°; the valve body is made of stainless steel and is formed by stretching, stamping or extruding stainless steel sheet or pipe; the wall thickness of the valve body is less than 1mm; the distance (L) from the bottom wall (1413) of the valve body to the valve port is more than twice the diameter (H2) of the second connecting pipe (122).

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