Electronic expansion valve and manufacturing method

Abstract

An electronic expansion valve is provided with a first valve chamber and a second valve chamber, the two valve chambers are respectively located on both sides of the valve port, the first valve chamber and the second valve chamber can be connected through the valve port, and the electronic expansion valve is also provided with a flow baffle, the flow baffle includes a convex portion, the convex portion is arranged opposite to the valve core, at least part of the valve core is located in the first valve chamber, and at least part of the convex portion is located in the second valve chamber, so that after the refrigerant passes through the valve port in the direction of throttling from the first valve chamber to the second valve chamber, the convex portion will change the flow mode of the refrigerant, which can change the flow of the refrigerant fluid and improve the flow noise of the refrigerant to meet the requirements of some systems for improving noise.

Description

[Technical field]

[0001] The present application relates to the field of refrigeration control technology, and in particular to an electronic expansion valve. [Background technology]

[0002] The refrigeration system includes a compressor, a throttling element, two heat exchangers and other parts. The throttling element can be an electronic expansion valve for throttling adjustment of the refrigerant. The use of an electronic expansion valve can achieve relatively precise control and improve the energy efficiency of the system. When the refrigerant passes through the electronic expansion valve, it may generate a certain amount of noise. Improving the noise of the refrigerant passing through the electronic expansion valve has been a technical topic that technicians related to electronic expansion valves and refrigeration systems have been studying for a long time. [Summary of the invention]

[0003] The object of the present invention is to provide an electronic expansion valve for improving the noise problem caused by refrigerant flowing through the electronic expansion valve.

[0004] In order to achieve the above purpose, the following technical solutions are adopted:

[0005] An electronic expansion valve comprises a valve seat, a valve body component, and a valve core, wherein the valve body component comprises a valve body, and the valve body is fixedly connected to the valve seat; the valve seat comprises a valve mouth portion, and the electronic expansion valve comprises a first valve cavity and a second valve cavity, wherein the first valve cavity is located on a side relatively above the valve mouth portion, and the second valve cavity is located on a side relatively below the valve mouth portion; the electronic expansion valve is provided with a valve mouth on the valve mouth portion, and the valve mouth can communicate with the first valve cavity and the second valve cavity; the electronic expansion valve has a first interface and a second interface, wherein the first interface is communicated with the first valve cavity, and the second interface is communicated with the second valve cavity; the The valve core is at least partially located in the first valve cavity, and the valve core cooperates with the valve port to adjust the flow rate 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 electronic expansion valve includes a flow baffle, and the flow baffle is fixedly connected or limit-connected to the side wall of the valve body, and the flow baffle includes a convex portion, and the flow baffle is located relatively below the valve port, and the convex portion is arranged opposite to the valve core or the convex portion is arranged toward the valve port, and the convex portion is smaller at a position close to the valve port than at a position relatively far from the valve port.

[0006] On this basis, the present invention also provides a method for manufacturing an electronic expansion valve.

[0007] By arranging a first valve chamber and a second valve chamber on both sides of the valve mouth of the electronic expansion valve, at least part of the valve core is in the first valve chamber, and a convex portion opposite to the valve core is arranged below the valve mouth or in the second valve chamber. When the refrigerant passes through the valve mouth from the first valve chamber to enter the second valve chamber, the convex portion is arranged so that when the refrigerant passes through the valve mouth in this direction, the flow pattern after throttling is improved, the pressure of the refrigerant fluid in the middle is improved, and the noise of the refrigerant electronic expansion valve is improved.

Brief Description of the Drawings

[0008] Figure 1 A structural schematic diagram of an electronic expansion valve according to a first embodiment of the present invention is provided;

[0009] Figure 2 for Figure 1 A partial enlarged schematic diagram of the electronic expansion valve shown;

[0010] Figure 3 for Figure 1 The electronic expansion valve shown includes a partial cross-sectional schematic diagram of a valve seat and a valve body component;

[0011] Figure 4-Figure 6 for Figure 1 The schematic diagram of the baffle shown in FIG. Figure 4 is a cross-sectional schematic diagram, Figure 5 A top view diagram is shown. Figure 6 It is a three-dimensional schematic diagram;

[0012] Figure 7-Figure 9 It is a partial cross-sectional schematic diagram of the electronic expansion valve, mainly focusing on the valve port structure;

[0013] Fig.10 A schematic diagram of a manufacturing method for an electronic expansion valve seat assembly;

[0014] Fig.11 The present invention is a schematic diagram of a manufacturing method for an electronic expansion valve seat assembly, a guide part and a connector. [Specific implementation method]

[0015] In order to enable those skilled in the art to better understand the technical solution provided by the present application, the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Please refer to Figure 1-Figure 6 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the electronic expansion valve. Figure 2 This is a partial enlarged schematic diagram. Figure 3 yes Figure 1 The partial cross-sectional diagram of the electronic expansion valve mainly includes the valve seat and the valve body, so that the structure of the valve mouth can be clearly seen; Figure 4-Figure 6 for Figure 1 Schematic diagram of the baffle in the electronic expansion valve, where Figure 4 is a cross-sectional schematic diagram, Figure 5 A top view diagram is shown. Figure 6 It is a three-dimensional schematic diagram.

[0017] It should be pointed out that the following technical solution is described for a specific electronic expansion valve structure. The present application mainly improves the refrigerant flow noise by improving the flow channel structure of the refrigerant flow, specifically by providing a convex portion at the relative position of the valve port. Other components of the electronic expansion valve, such as the magnetic rotor assembly, the screw valve core assembly, the nut assembly, the stop device and the like are not limited here. The technical solution of the present application does not specifically limit the structure of the above components. Those skilled in the art can apply it to all similar electronic expansion valve structures based on the technical solution disclosed in this article. The description of other components such as the above-mentioned magnetic rotor assembly, the screw valve core assembly and the like in this article is only for the purpose of facilitating the understanding of the basic working principle of the electronic expansion valve, and does not impose any structural limitation.

[0018] 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 screw valve core assembly 18, and a nut assembly 19. The valve body component 14 includes a valve body 141. The valve seat 11 and the valve body 141 are fixedly connected by welding, and are also fixedly connected with a first connecting pipe 121 and a second connecting pipe 122. Figure 1 In the direction shown, a connector 15 is provided on one side above the valve seat 11. The connector is generally cup-shaped with an opening at the bottom. The connector is fixedly connected to the valve seat 11 and is also fixedly connected to the sleeve 16, that is, the valve seat is connected to the sleeve through the connector. Specifically, a step can be provided on the upper side of the valve seat 11, and the bottom opening of the connector 15 is matched with the step, and the two are fixed by welding, or the two are relatively fixed first by other means, such as clamping and then welding.

[0019] On the upper side of the connector 15, a sleeve 16 is also provided, and the sleeve 16 and the connector 15 can be fixed by welding, so that the sleeve 16, the connector 15, and the valve seat 11 are fixedly connected, and the space between the three 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 connector 15 is not necessarily present. When the connector 15 does not exist, the sleeve 16 can be directly fixedly connected to the valve seat 11, or other components can be used for fixing, for example, the outer edge of the valve seat 11 is directly extended upward and then fixed to the sleeve 16 by welding.

[0020] The magnetic rotor assembly 17 can rotate 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 to or integrally arranged with the magnetic rotor 171. The screw valve core assembly 18 includes a screw 181, and the screw 181 is fixedly connected to the connecting plate 172. In this way, the screw 181 is connected to the magnetic rotor assembly 17 through the connecting plate 172 to form a whole. Specifically, the screw 181 and the connecting plate 172 can be fixedly connected by welding or connected by other fixed connections or limit connections such as clamping and crimping.

[0021] The 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 supporting member 187. The screw 181 and the valve core 182 are floatingly connected via a sleeve. The sleeve includes a sleeve portion 183 and a sleeve cover 184. The sleeve portion 183 is generally cup-shaped with an opening at the bottom, and has an opening at the bottom. The valve core 182 passes through the opening and is limited by the sleeve portion 183. At least a portion 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 be driven to move a certain stroke relative to the valve port, thereby cooperating with the valve port 1121 to adjust the throttling. 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 mouth portion 112 to adjust the opening of the valve port 1121. When the valve core abuts against the valve mouth portion 112, the valve core 182 can overcome the spring force and move relative to the sleeve portion 183 within a certain range, but will not detach from the sleeve. A sleeve cover 184 is arranged at the top of the sleeve part 183. The sleeve part 183 and the sleeve cover 184 are relatively fixed or limited. The sleeve cover 184 is provided with an abutting portion. The lower end of the screw rod 181 is fixedly connected with a fixing member 185. A wing is arranged on the fixing member 185. A spring 186 is arranged on the side of the wing facing the valve core and 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 screw rod 181 passes through the sleeve cover 184, and the fixing member 185 is fixedly connected to the screw rod 181, and then assembled with the sleeve part 183, and the sleeve cover 184 is assembled with the sleeve part 183. In this way, the abutting portion of the sleeve cover 184 is arranged opposite to the wing of the fixing member 185, forming a limiting structure, and at the same time, the sleeve and the screw rod 181 form a floating connection structure similar to a suspension. The sleeve 183 and the screw 181 cannot be separated, and due to the action of the spring, they can make a certain relative movement when the valve core abuts against the valve port 112. The separation mentioned in this article refers to the separation of the sleeve 183 and the screw 181 into two separate parts without any restriction on each other, rather than just the lack of physical contact between the two.

[0022] 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 formed by stamping a metal plate. The nut 191 is fixedly arranged with the sleeve 16 and / or the connecting piece 15 through the metal connecting piece 192. The nut 191 can be made of a non-metallic material and is injection molded with the connecting piece 192 as an insert. The connecting piece 192 and the connecting piece 15 can be fixedly connected by welding. When no connecting piece is provided, the connecting piece 192 can be fixedly connected to the valve seat 11 or the sleeve by welding.

[0023] The nut 191 has a through hole extending axially therethrough, and an internal thread is provided on the inner side wall of the nut where the through hole is provided. Correspondingly, a corresponding external thread is provided on the outer peripheral surface of the screw rod 181. Thus, when the magnetic rotor assembly 17 rotates, the screw rod 181, under the action of the thread pair, not only rotates but also makes a lifting motion relative to the nut assembly 19, thereby driving the valve core 182 to make a lifting motion within a certain range.

[0024] 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 arranged on its periphery, wherein the outer diameter of the first outer edge portion 201 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, so that when assembling, the nut 191 is sleeved on the upper end of the guide portion 20, and the first outer edge portion 201 can guide the assembly of the nut. The outer diameter of the second outer edge portion 202 is adapted to the inner diameter of a part of the inner wall of the valve seat 11, and can guide during assembly. Specifically, the guide portion 20 can be fixedly connected to the valve seat 11 by interference fit or welding. 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, which is determined based on the design that the inner diameter of the inner hole of the valve seat is smaller than the inner diameter of the inner hole of the lower end of the nut. As an equivalent replacement, the inner diameter of the inner hole of the valve seat can also be set to be larger than the inner diameter of the inner hole of the lower end of the nut, or the inner diameters of the two can be set to be the same or approximately the same. A valve core guide portion 203 is also provided inside the guide portion 20. The inner diameter of the valve core guide portion 203 matches the outer diameter of the valve core 182, so that the outer edge surface of the valve core 182 can move along the valve core guide portion 203. In this way, when the valve core moves, the valve core guide portion 203 can provide good guidance and radial support for the valve core, which can relatively reduce the abnormal wear of the valve port caused by the swing of the valve core.

[0025] 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, the valve body component 14, the first connecting pipe 121, and the second connecting pipe 122 are fixedly connected by welding. Specifically, the valve seat 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 mouth portion 112, and a valve mouth 1121 is provided at the valve mouth portion 112. The electronic expansion valve has a first valve chamber A and a second valve chamber B. In the present application, the valve chamber above the valve mouth portion 112 and the part connected to the first interface 1211 of the first connecting pipe 121 is the first valve chamber A, and the valve chamber below the valve seat and the part connected to the second interface 1221 of the second connecting pipe 122 is the second valve chamber B. The first valve chamber A and the second valve chamber B can be connected through the valve mouth 1121. The first valve chamber A is located on the relatively upper side of the valve mouth portion 112, and the second valve chamber B is located on the relatively lower side of the valve mouth portion 112. The diameter D of the valve mouth 1121 is smaller than the diameter H2 of the second interface 1221, the diameter H2 of the second interface 1221 is smaller than the diameter H1 of the second valve chamber B, and the diameter H3 of the first interface 1211 is smaller than the diameter H1 of the second valve chamber B. Herein, the second valve chamber B is not limited to having the same diameter. If the diameters are different, the diameter H1 of the second valve chamber B refers to the diameter at the relatively largest point.

[0026] Some systems may require the electronic expansion valve to be able to flow in both directions. In this article, 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. In other words, the flow of refrigerant from the first connecting pipe through the first valve cavity, the valve port, and the second valve cavity to the second connecting pipe is defined as the first flow direction, and the flow of refrigerant from the second connecting pipe through the second valve cavity, the valve port, and the first valve cavity to the first connecting pipe is defined as the second flow direction.

[0027] The thickness of the valve mouth portion 112 of the present embodiment gradually increases radially outward from the valve mouth 1121, that is, the wall thickness h of the valve mouth portion 112 at the valve mouth is relatively the thinnest, and the wall thickness h of the valve mouth portion 112 at the valve mouth is the relatively smallest wall thickness of the valve mouth portion. In other words, h is the height of the valve mouth. The wall thickness of the valve mouth portion 112 gradually increases radially outward, and the wall thickness h of the valve mouth portion 112 at the valve mouth is less than the wall thickness H of the valve mouth portion 112 away from the valve mouth. In this way, the wall thickness h of the valve mouth portion 112 at the valve mouth can be reduced accordingly, so that the wall thickness h of the valve mouth portion 112 at the valve mouth can be between 0.25mm-0.45mm, or even between 0.25mm-0.4mm. The wall thickness of the valve mouth portion increases from the inside to the outside, or the lower wall 1122 of the valve mouth portion is roughly trumpet-shaped, for example, the lower wall 1122 of the valve mouth portion 112, from the cross section formed through the center, the extension line of the lower wall 1122 at the cross section is roughly at an angle α, such as Figure 2, α can be between 100°-140°, or α can be between 110°-130°. In this way, when the refrigerant flows in the first flow direction, the refrigerant passes through the valve port 1121 and the trumpet-shaped gradually expanding area 1110, which is conducive to the diffusion of the refrigerant to the surrounding area, thereby improving the noise of the refrigerant flowing in the first flow direction. That is, the channel space of the electronic expansion valve at the valve port 112 includes the space formed by the valve port 1121 and the valve core and the space formed by the gradually expanding area 1110 and the valve core. When the refrigerant flows in the first flow direction, it first flows through the valve port 1121, passes through the gradually expanding area 1110, and then enters the second valve chamber B.

[0028] The electronic expansion valve of the present embodiment also includes a baffle 133. The valve body component 14 includes a valve body 141 and the baffle 133. The baffle 133 includes a matching portion 1331, a convex portion 1332, and a connecting portion 1333. In the present embodiment, the baffle 133 can be formed in one step by stamping or other methods, and a notch 1334 is formed at the same time. The notch 1334 separates a number of matching portions 1331. Moreover, when the baffle 133 is fixedly connected or position-limitedly connected to the valve body component 14, the notch 1334 can connect the valve cavity spaces on the upper and lower sides of the baffle 133. The matching portion 1331 is used for fixing or position-limiting installation with the inner wall of the valve body, and the connecting portion 1333 connects the convex portion 1332 and the matching portion 1331. In the present embodiment, the number of matching portions 1331 is 3, and accordingly, the number of notches 1334 is also three. The convex portion 1332 is roughly cap-shaped, and the convex portion is a protruding structure, so as to attach Figure 1 As shown in the figure, the convex part 1332 is convex toward the valve port 1121, or the convex part 1332 is protruding toward the valve core. When the valve core is located at the valve port, the convex part faces the valve core, and when the valve core is not located at the valve port, the convex part faces the valve port. The convex part can make most of the refrigerant flow to the surrounding area of ​​the convex part when the refrigerant flows from the valve port to the second valve cavity B, so that the refrigerant in the middle is relatively reduced, thereby improving the noise of the refrigerant flow; that is, the electronic expansion valve is provided with a convex part in the second valve cavity B, or the electronic expansion valve has a convex part, at least part of the convex part is below the valve port, and the convex part 1332 is protruding toward the valve port, or the convex part 1332 has a protruding part facing the valve core. In this embodiment, the protrusion 1332 is relatively small at position 0 close to the valve port 1121, and is relatively large at position M relatively far away from the valve port 1121. The maximum position M of the protrusion 1302 may be larger than the diameter D of the valve port, or the protrusion 1332 gradually increases from position 0 relatively close to the valve port 1121 to position M far away from the valve port 1121.

[0029] The baffle 133 of this embodiment is formed by stamping metal materials such as stainless steel plates, which requires less material and is simpler to process. In addition, the matching parts 1331 of the baffle are distributed in the circumferential direction and have a certain elasticity. During assembly, the matching parts 1331 can apply a certain pre-tightening force to the inner wall of the valve body, which is conducive to the pre-positioning of the baffle and the valve body. As an alternative solution, the inner wall or outer wall of the valve body may not be provided with a positioning structure for the baffle, but the baffle is directly pressed into the inner wall of the valve body, and the pre-tightening force of the matching part 1331 is used to fix the relative position of the valve body. Then, when the valve body and the valve seat are assembled, the lower end of the valve seat is abutted against the top of the matching part and the baffle is pushed to continue to move a distance toward the inner wall of the valve body. Since a positioning structure is provided between the valve seat and the valve body, after the valve seat and the valve body are positioned, the baffle is also positioned accordingly, and the top of the baffle is kept in abutment with the bottom of the valve seat. When this structure is used for furnace welding, the solder can easily flow into the gap between the valve seat and the valve body, and into the gap between the matching portion of the baffle and the inner wall of the valve body, thereby facilitating improved welding quality.

[0030] As an alternative, the entire convex portion 1332 or a portion of the top of the convex portion (i.e., Figure 1 As a reference, the portion relatively close to the top is processed as a separate part, and then combined with other parts of the baffle 133 by welding or riveting to form a component as a complete baffle 133.

[0031] The valve body 141 also has a recess 140 at its side wall 1411. The recess 140 can be a groove structure formed by dotting or notching to limit or fix the flow blocking member, that is, the flow blocking member is limited or fixed to the side wall 1411 of the valve body. Of course, in addition to using the recess 140 for limiting or fixing, other methods can also be used to limit or fix the flow blocking member, such as pressing the flow blocking member from the upper end of the valve body 141 by interference fit, and then fixing the flow blocking member to the side wall 1411 of the valve body by spot welding, which can also achieve the purpose of fixing.

[0032] As another alternative, the baffle may be made of injection-molded plastic material. The baffle made of plastic material is not suitable for furnace welding after being assembled with the inner wall of the valve body. The baffle may be limited and fixed by an inward recess 140 formed by dotting or grooving, while the valve seat and the valve body may be sealed and fixed by laser welding or other methods.

[0033] In addition, the valve body 141 is also provided with an inward flange portion 1412 on its side wall portion 1411 to facilitate the connection with the second connecting pipe 122. The convex portion is arranged opposite to the valve core, specifically at the opposite position, to improve the flow mode of the refrigerant fluid in the middle to reduce the refrigerant noise. In addition, the convex portion can be roughly streamlined in design to reduce the refrigerant flow resistance. When the valve core abuts against the valve mouth, the position of the convex portion is set so that the convex portion and the valve core will not contact, but can be relatively close to the valve core. The structure of the convex portion is not limited to the structure of the upper small and the lower large in the present embodiment, and can also be a structure of approximately the same size in the upper and lower parts. The baffle can be formed by stamping a metal material such as a stainless steel material.

[0034] The material of the valve body 141 can be stainless steel, for example, the valve body is formed by stretching, stamping or extrusion of a stainless steel plate or pipe; the wall thickness of the valve body is less than 1 mm; the distance L from the bottom wall portion 1413 of the valve body to the valve mouth portion 121 is more than twice the diameter H2 of the second interface 1221.

[0035] The above-mentioned electronic expansion valve is provided with two valve chambers, which are respectively located on both sides of the valve mouth. The first valve chamber and the second valve chamber can be connected through the valve mouth, and a convex portion is provided under the second valve chamber or the valve mouth. The convex portion is arranged to protrude in the direction of the valve mouth or the convex portion is arranged opposite to the valve core, so that when the refrigerant is throttled in the first flow direction, the refrigerant flows out to the second valve chamber after throttling. The second valve chamber has a relatively large space. Combined with the setting of the convex portion, the flow mode of the middle part of the refrigerant is changed. The convex portion is arranged relative to the valve core or arranged toward the valve mouth, which can block the convergence of the refrigerant fluid in the middle and improve the flow noise of the refrigerant. In addition, the maximum part of the convex portion can be made larger than the diameter of the valve mouth to improve the flow noise of the refrigerant. In the second flow direction, the flow noise of the refrigerant can also be effectively improved.

[0036] The following introduces a method for manufacturing the electronic expansion valve described in this embodiment, and in particular, a method for manufacturing a valve seat assembly of the electronic expansion valve.

[0037] Please refer to Fig.10 , Fig.10 The present invention is a schematic diagram of a manufacturing method of an electronic expansion valve seat assembly.

[0038] The valve seat assembly described in this specification includes a valve seat 11, a valve body 141, a flow blocking member 133, a first connecting pipe 121, and a second connecting pipe 122. Fig.10 , Fig.10 The figure is a schematic diagram of the manufacturing method of the valve seat assembly. Fig.10As shown, the valve body 141, the second connecting pipe 122, the first connecting pipe 121, and the flow blocking member 133 can be prepared in advance. Among them, the valve body 141 can be made of a thin-walled stainless steel part by spinning, and when manufacturing the valve body 141, the side wall 1411 thereof is processed to form an inward flange portion 1412, and then the second connecting pipe 122 is inserted into the valve body 141, and the insertion depth of the second connecting pipe is ensured by tooling, for example, the end of the second connecting pipe 122 is made flush with or approximately equal to the end of the flange portion 1412. Since the valve body 141 is a thin-walled part, the connection strength between the valve body 141 and the second connecting pipe 122 can be ensured in this way. After the valve body 141 and the second connecting pipe 122 are assembled, the first welding ring 1a is placed at the joint between the two.

[0039] The baffle 133 is formed by stamping a stainless steel plate. Specifically, three notches 1334 can be stamped out on the circular plate, and the matching portion 1331 can be formed at the same time. Alternatively, the baffle 133 can be placed in a special mold. While the notches 1334 are being stamped out, the edge of the baffle relative to the middle portion is folded upward, and the middle portion of the baffle is arched upward to form a convex portion 1332. In this way, the baffle 133 can be formed by a single stamping operation.

[0040] Then, the baffle 133 is assembled to the valve body 141. Specifically, the baffle 133 can be pressed into the valve body 141 from the opening above the valve body 141, so that the matching portion 1331 of the baffle fits with the inner wall of the valve body, and the baffle 133 and the valve body 141 are relatively fixed. Specifically, in a specific embodiment, the baffle 133 can be fixed directly by interference fit, and then fixed by welding after matching with the valve seat 11. As an alternative, as described in the first embodiment, a recess 140 can also be provided on the side wall 1411 of the valve body 141, such as by forming a dotted or grooved inward groove structure, so that after the baffle 133 is installed in the valve body 141, it is limited by the recess 140. Even if there is a certain gap between the baffle 133 and the valve body 141, due to the presence of the recess 140, the baffle 133 will not slide to the bottom of the valve body 141 during the processing. Alternatively, another positioning method may be used, such as first pressing the baffle 133 into the valve body 141 and then fixing the baffle 133 to the valve body 141 by spot welding. In this way, there is no need to set a recess on the side wall 1411 and the purpose of fixed connection can also be achieved.

[0041] After the baffle 133 is assembled with the valve body 141, it is assembled with the valve seat 11. Specifically, a matching portion 113 can be processed at the lower end of the valve seat 11, and the outer diameter of the matching portion 113 is adapted to the inner diameter of the upper end of the valve body 141. Then, the matching portion 113 is pressed into the opening above the valve body 141. It can be an interference fit or a clearance fit, so that the two are pressed into place. A second welding ring 1b is placed between the valve seat 11 and the valve body 141.

[0042] A mounting portion 114 is processed on the side wall of the valve seat 11, and the first connecting pipe 121 is fixedly connected to the valve seat 11 by inserting the mounting portion 114. Specifically, the first connecting pipe 121 can be inserted into a predetermined depth by using tooling positioning, and a third welding ring 1c can be placed between the first connecting pipe 121 and the valve seat 11.

[0043] The assembled components are placed in a tunnel furnace for furnace welding. After the first welding ring 1a is melted, the second connecting pipe 122 is fixedly connected to the valve body 141; after the second welding ring 1b is melted, the valve seat 11, the valve body 141, and the baffle 133 are fixedly connected; after the third welding ring 1c is melted, the first connecting pipe 121 is fixedly connected to the valve seat 11. That is, the valve seat assembly can be formed by furnace welding once.

[0044] Fig.11 The figure is a schematic diagram of a manufacturing method of the valve seat assembly, the guide part and the connecting piece of the electronic expansion valve. The manufacturing method of the valve seat assembly is described above. In addition, in order to improve efficiency, the guide part 20, the connecting piece 15 and the valve seat assembly can also be fixedly connected by a single furnace welding. Fig.11 As shown, the valve seat 11 and the guide part 20 can be assembled by interference fit or gap press fit, and then fixed by laser welding. Of course, they can be fixed by spot welding and then fixed by one-time furnace welding. Then, the connector 15 is assembled with the valve seat 11, and the fourth welding ring 1d is placed between the connector 15 and the valve seat 11. The assembly method between the valve seat 11 and the valve body 141, the first connecting pipe 121, and the second connecting pipe 122 can refer to the assembly method of the above-mentioned valve seat assembly. After the valve seat, the guide part, the connector, the baffle, the valve body, the first connecting pipe, and the second connecting pipe are assembled together, they are put into a tunnel furnace for furnace welding. In this way, the first welding ring 1a, the second welding ring 1b, the third welding ring 1c, and the fourth welding ring 1d can be melted together during the furnace welding process, thereby completing the manufacture of the assembly.

[0045] In the above embodiment, the first welding ring 1a and the second welding ring 1b are ring-shaped and can be directly mounted on the first pipe 121 and the second pipe 122 respectively. The third welding ring 1c and the fourth welding ring 1d are ring-shaped with a gap and can be placed after the corresponding components are assembled. Of course, those skilled in the art can understand that the above is only an example of a specific shape of the welding ring, and the third welding ring 1c and the fourth welding ring 1d can also be set in a ring shape, so that when assembling, it is only necessary to put on the welding ring first and then assemble the corresponding components.

[0046] The structure of the valve mouth can also be changed, such as Figure 7 In the embodiment shown, the valve seat 11a of this embodiment is different from the above-mentioned embodiment, mainly in the structure of the valve mouth portion 112a. The lower wall of the valve mouth portion 112a is in an outwardly convex arc shape when viewed from a cross section formed through the center. The lower wall of the valve mouth portion is also roughly trumpet-shaped, and the thickness of the valve mouth portion 112a also gradually increases radially outward from the valve mouth 1121, but the increase is faster as it approaches the middle. The wall thickness h of the valve mouth portion 112a near the valve mouth is relatively thinnest, and the thickness gradually increases radially outward. The wall thickness h of the valve mouth portion 112a at the valve mouth is significantly smaller than the wall thickness H of the valve mouth portion 112a away from the valve mouth. In this way, the wall thickness h of the valve mouth portion 112a at the valve mouth can be reduced accordingly. For example, the wall thickness h of the valve mouth portion 112a at the valve mouth can be between 0.25mm-0.45mm, or even between 0.25mm-0.4mm. The wall thickness of the valve mouth portion gradually increases from the inside to the outside. That is, the electronic expansion valve also has a gradual expansion zone 1110 in the valve mouth portion. The refrigerant can diffuse to the surrounding side after passing through the valve mouth 1121, which can be beneficial to improving the refrigerant noise.

[0047] like Figure 8 The electronic expansion valve can also adopt another valve seat 11b. Correspondingly, the lower wall of the valve mouth portion 112b is in the shape of an inwardly concave arc when viewed from the cross section; or in other words, the lower wall of the valve mouth portion is also roughly trumpet-shaped, and the thickness of the valve mouth portion 112b also presents a gradually increasing structure from the valve mouth 1121 radially outward. The wall thickness h of the valve mouth portion 112b at the valve mouth is relatively the thinnest, and the thickness gradually increases radially outward, and the wall thickness h of the valve mouth portion 112b at the valve mouth is significantly smaller than the wall thickness H of the valve mouth portion 112b away from the valve mouth.

[0048] In addition, the lower wall of the valve mouth can also be a combination of several structures, such as Fig. 9, the lower wall of the valve mouth 112c, viewed from the cross section, includes a first part 112c1 and a second part 112c2, the first part 112c1 is in the shape of an arc convex in the cross section, and the extension line of the shape of the second part 112c2 in the cross section is at an angle, so that the lower wall of the valve mouth is also roughly trumpet-shaped, and the thickness of the valve mouth 112c also presents a gradually increasing structure from the valve mouth 1121 radially outward, the wall thickness h of the valve mouth 112c at the valve mouth is relatively the thinnest, and the thickness gradually increases radially outward, the wall thickness h of the valve mouth 112c at the valve mouth is less than the wall thickness H of the valve mouth 112c away from the valve mouth, that is, the electronic expansion valve also has a gradual expansion area 1110 at the valve mouth, and the refrigerant can diffuse to the peripheral side after passing through the valve mouth 1121, which is conducive to improving the refrigerant noise. The shape of the valve mouth here is only an example, and it is not a limitation of the technical solution.

[0049] Another embodiment is described below. The difference between the electronic expansion valve and the above embodiment is the structure of the valve port. The valve port of this embodiment is not provided with a gradual expansion zone. The convex portion 1302 is directly opposite to the valve port 1121 or directly opposite to the valve core 182. When the refrigerant is throttled by the electronic expansion valve in the first flow direction, the refrigerant will be diverted to the surrounding side due to the presence of the convex portion 1302 when it comes out of the valve port 1121. If the convex portion 1302 is a physical setting, there will be basically no refrigerant flowing through the middle; this can improve the interference phenomenon of the refrigerant on the side of the valve core converging to the middle, thereby improving the refrigerant flow noise.

[0050] The valve body of the above embodiment can be formed by drawing or extruding stainless steel, such as by using plate or pipe, which can make the processing relatively convenient and make the wall thickness of the valve body less than 1mm. The diameter mentioned in this article refers to that its cross section is not limited to circular, such as the cross section of the valve port is not limited to circular, and can also include other shapes, such as the diameter of the second valve cavity, and its cross section is not limited to circular. The diameter H2 of the second interface is larger than the diameter D of the valve port 1121, the diameter H1 of the second valve cavity B is larger than the diameter H2 of the second interface connected to the second connecting pipe, the diameter H1 of the second valve cavity B is larger than the diameter H3 of the first interface used for connection by the first 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 diameter is equivalent to the equivalent inner diameter, that is, the inner diameter value when the cross-sectional area at this place is converted into a circle with the same cross-sectional area, or the two have the same cross-sectional area, so they have the same flow area.

[0051] It should be noted that the directional nouns such as up, down, left, and right mentioned in this article are all based on the drawings in the specification and are introduced for the convenience of description; and the ordinal numbers such as "first" and "second" in the component names are also introduced for the convenience of description, and do not mean any limitation on any order of the components. In addition, since the functions of some parts of the various components provided in the above embodiments are the same, this specification adopts a unified naming method for these parts. The electronic expansion valve provided by the relevant technical solution is introduced in detail above, and the specific embodiments are used in this article for elaboration. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention, and does not impose any form of limitation on the present invention.

Claims

1. An electronic expansion valve, comprising a valve seat, a valve body component, and a valve core, wherein the valve body component comprises a valve body, and the valve body is fixedly connected to the valve seat; the valve seat comprises a valve opening portion, and the electronic expansion valve comprises a first valve cavity (A) and a second valve cavity (B), wherein the first valve cavity (A) is located on a side relatively above the valve opening portion (112), and the second valve cavity (B) is located on a side relatively below the valve opening portion; the electronic expansion valve is provided with a valve opening (1121) at the valve opening portion, and the valve opening (1121) can communicate with the first valve cavity (A) and the second valve cavity (B); the electronic expansion valve has a first interface (1211) and a second interface (1221), wherein the first interface (1211) is communicated with the first valve cavity (A), and the second interface (1221) is communicated with the second valve cavity (B); the valve core is at least partially located in the first valve cavity (A), and the valve core cooperates with the valve opening (1121) to adjust the flow 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 diameter of the second valve cavity (B); the electronic expansion valve comprises a baffle and a convex portion, the baffle is located relatively below the valve port, the convex portion is arranged opposite to the valve core or the convex portion is arranged toward the valve port, the convex portion at a position close to the valve port is smaller than the convex portion at a position relatively far from the valve port, the baffle is made of an integral material, the baffle comprises a matching portion, a connecting portion, a notch portion, and a convex portion, the matching portion is fixedly connected or position-limitedly connected to the side wall portion of the valve body, the baffle comprises a convex portion, the connecting portion connects the matching portion and the convex portion, the convex portion is located in the radial middle area of ​​the baffle, the matching portion is arranged at the opposite edge of the baffle, the notch portion separates the matching portion, and the notch portion can communicate with the space on the upper and lower sides of the baffle.

2. The electronic expansion valve according to claim 1, characterized in that: The flow baffle is formed by stamping of stainless steel material, the convex portion is located in the second valve cavity or at least partially located in the second valve cavity, the maximum point of the convex portion is larger than the diameter D of the valve port; the convex portion is relatively close to the valve port portion, the valve body includes a bottom wall portion, and the distance between the convex portion and the valve port portion is smaller than the distance between the convex portion and the bottom wall portion of the valve body.

3. The electronic expansion valve according to claim 1 or 2, characterized in that: The baffle is made of plastic material by injection molding, and the matching portion of the baffle is limitedly connected to the side wall portion of the valve body.

4. The electronic expansion valve according to claim 1 or 2, characterized in that: The flow baffle comprises more than three fitting parts, which are elastic and can apply a pre-tightening force to the inner wall of the valve body after being assembled with the valve body. The top of the fitting part abuts against the bottom of the valve seat, and the convex part comprises a part, which gradually increases from a position relatively close to the valve port to a position far away from the valve port.

5. The electronic expansion valve according to any one of claims 1-2, characterized in that: The electronic expansion valve is further provided with a gradually expanding zone (1110) at the valve mouth, the gradually expanding zone is relatively closer to the second valve cavity than the valve mouth, the wall thickness h of the valve mouth near the valve mouth is smaller than the wall thickness H of the valve mouth relatively far from the valve mouth; the wall thickness h of the valve mouth near the valve mouth is between 0.25mm and 0.45mm.

6. The electronic expansion valve according to any one of claims 1-2, characterized in that: The material of the valve body is stainless steel, and the valve body is formed by stretching, stamping or extruding a stainless steel plate or pipe; the wall thickness of the valve body is less than 1 mm; the electronic expansion valve comprises a second connecting pipe (122), and the distance L from the bottom wall portion (1413) of the valve body to the valve mouth portion is more than twice the diameter H2 of the second connecting pipe (122).

7. A method for manufacturing an electronic expansion valve according to any one of claims 1 to 6, characterized in that: At least the following steps are included: a. Prepare a flow blocking member, a valve body, a valve seat, a first connecting pipe, and a second connecting pipe. The side wall of the valve body is processed to form an inward flange portion, and the side wall of the valve seat is processed to form a mounting portion; b. inserting the second connecting pipe into the side wall of the valve body and matching it with the flange, and placing a first welding ring at the joint between the second connecting pipe and the valve body; c. Press the baffle into the upper opening of the valve body and fix them relatively, then assemble and fix the valve seat to the upper end of the valve body, and place a second welding ring at the joint between the valve seat and the valve body; d. inserting the first connecting pipe into the mounting portion, and placing a third welding ring at the joint between the first connecting pipe and the valve seat; e. Put the components obtained after the above steps b, c, and d into a tunnel furnace for furnace welding; f. Assemble and fix the assembly obtained in step e with the nut, the screw valve needle assembly, the magnetic rotor assembly, and the housing to form an electronic expansion valve; The order of steps b, c, and d above can be interchanged.

8. The method for manufacturing an electronic expansion valve according to claim 7, characterized in that: The following steps are also included: g. Prepare a guide portion and a connecting piece, wherein the guide portion has a second outer edge portion, and the connecting piece has an opening at the bottom; h. Press-fitting the guide portion through the second outer edge portion onto the inner edge of the upper end portion of the valve seat (11), and fixing them by laser welding or spot welding; i. Fitting the bottom opening of the connecting piece onto the outer edge of the upper end of the valve seat (11), and placing a fourth welding ring at the joint between the connecting piece and the valve seat; j. Place the components obtained after steps b, c, d, h, and i into a tunnel furnace for furnace welding.

9. The method for manufacturing an electronic expansion valve according to claim 7 or 8, characterized in that: The baffle is formed by punching a stainless steel plate at one time to form a notch portion, and simultaneously forming a matching portion and a convex portion.

10. The method for manufacturing an electronic expansion valve according to claim 7 or 8, characterized in that: In step c, the baffle member is fixed to the valve body by means of an interference fit; or, an inward groove is formed on the side wall of the valve body by means of dotting or grooving; or, the baffle member is first pressed into the valve body and fixed to the valve body by means of spot welding.

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