Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve body and a valve assembly. The valve body is provided with a valve cavity which is provided with a valve port. The guide assembly is arranged in the valve cavity and comprises a guide sleeve and a guide column. The guide sleeve is arranged in the valve cavity and provided with a guide sleeve cavity, one part of the guide column is arranged in the guide sleeve cavity, the other part of the guide column is opposite to the valve port and extends out of the guide sleeve cavity, and the guide column is provided with a guide column cavity. An assembling step is arranged on the periphery of the guide column, an assembling groove is formed in the cavity wall of the end, away from the valve port, of the guide sleeve cavity, the assembling step is contained in the assembling groove and welded to the assembling groove, and a groove is formed in the surface of the side, back to the valve port, of the assembling step. The valve assembly is partially arranged in the guide column cavity, the two ends of the valve assembly extend out of the guide assembly and the valve head assembly respectively, and the valve assembly is used for opening and closing the valve port.

Description

Technical Field

[0001] The present disclosure relates to the technical field of valves, and particularly to an electronic expansion valve. Background Art

[0002] As a throttling element, an electronic expansion valve is used to regulate the on-off and flow rate of a fluid. The guiding assembly of the electronic expansion valve may include a guiding sleeve and a guiding column. The guiding sleeve is arranged in the valve cavity, a part of the guiding column is arranged in the guiding sleeve, another part of the guiding column extends out of the guiding sleeve in the direction away from the valve port, and the valve assembly part of the electronic expansion valve is arranged in the cavity of the guiding column. However, in the existing solutions, the guiding sleeve and the guiding column are connected by welding, and the heat generated during the welding process will be transferred to the mating position between the guiding column and the valve assembly, resulting in deformation of the guiding surface of the guiding column for mating with the valve assembly, and affecting the guiding effect of the guiding column on the valve assembly. Summary of the Utility Model

[0003] A main object of the present disclosure is to overcome at least one defect of the above-mentioned prior art, and to provide an electronic expansion valve that can avoid deformation of the guiding surface of the guiding column for mating with the nut assembly due to heat transfer during the welding process.

[0004] To achieve the above object, the present disclosure adopts the following technical solutions:

[0005] According to one aspect of the present disclosure, there is provided an electronic expansion valve, which includes: a valve body, a guiding assembly, and a valve assembly; the valve body is provided with a valve cavity, and the valve cavity is provided with a valve port; the guiding assembly is arranged in the valve cavity, and the guiding assembly includes a guiding sleeve and a guiding column; the guiding sleeve is arranged in the valve cavity and is provided with a guiding sleeve cavity, a part of the guiding column is arranged in the guiding sleeve cavity, another part of the guiding column extends out of the guiding sleeve cavity in the direction away from the valve port, and the guiding column is provided with a guiding column cavity; an assembly step is arranged on the outer periphery of the guiding column, an assembly groove is arranged on the cavity wall of the guiding sleeve cavity at the end away from the valve port, the assembly step is received in the assembly groove and is connected by welding, and a groove is arranged on the surface of the assembly step on the side away from the valve port; part of the valve assembly is arranged in the guiding column cavity, and both ends of the valve assembly extend out of the guiding assembly respectively, and the valve assembly is used to open and close the valve port.

[0006] According to one embodiment of the present disclosure, the welding position between the assembly step and the assembly groove is located between the end of the outer peripheral surface of the assembly step away from the valve port and the end of the inner peripheral groove wall of the assembly groove away from the valve port.

[0007] According to one embodiment of the present disclosure, a part of the guiding column and the inner wall of the guiding sleeve cavity are in interference fit; wherein, there is a clearance fit between the outer peripheral surface of the assembly step and the inner peripheral groove wall of the assembly groove.

[0008] According to one embodiment of the present disclosure, one of the following is provided: a groove is circumferentially provided on the assembly step, and the groove is annular; alternatively, at least two grooves are circumferentially provided on the assembly step, the grooves are annular, and the at least two grooves are radially spaced apart; alternatively, at least two grooves are circumferentially provided on the assembly step, the grooves are arc-shaped, and the at least two grooves are spaced apart along the same circular path.

[0009] According to one embodiment of the present disclosure, one or more of the following is provided: in the radial direction, the ratio of the groove width of the groove to the width of the assembly step is 1 / 4 to 3 / 4; and / or, in the radial direction, the ratio of the distance between the outer edge of the groove and the outer edge of the assembly step to the width of the assembly step is greater than or equal to 1 / 4; and / or, in the axial direction, the ratio of the groove depth of the groove to the thickness of the assembly step is 1 / 3 to 1 / 2.

[0010] According to one embodiment of the present disclosure, a third chamfer structure is provided on the wall of the guide sleeve cavity, and the third chamfer structure is adjacent to one end of the assembly groove close to the valve port.

[0011] According to one embodiment of the present disclosure, the part of the wall of the guide sleeve cavity without the assembly groove and the third chamfer structure has a first region and a second region, the first region and the second region are axially distributed, and the first region is located between the third chamfer structure and the second region; wherein, the first region of the guide sleeve cavity is in clearance fit with the guide post, and the second region of the guide sleeve cavity is in interference fit with the guide post.

[0012] According to one embodiment of the present disclosure, the valve assembly includes a valve head assembly and a nut assembly; the nut assembly is arranged on the part of the guide post extending out of the guide sleeve cavity, and is in guiding cooperation with the guide post; part of the valve head assembly is arranged in the guide post cavity, one end of which is in screw connection with the nut assembly so that the valve head assembly can move axially when rotating, and the other end is used to open and close the valve port.

[0013] According to one embodiment of the present disclosure, the electronic expansion valve further includes a sealing assembly, and the sealing assembly is arranged between the guiding assembly and the valve assembly; wherein, the sealing assembly includes a sealing ring and an O-ring, and the sealing ring is located between the inner circumference of the O-ring and the valve assembly.

[0014] According to one embodiment of the present disclosure, the guiding column has a first guiding section and a second guiding section axially distributed. The first guiding section is disposed in the guiding sleeve cavity, the second guiding section extends out of the guiding sleeve cavity away from the valve port, and the assembly step is located at the connection between the first guiding section and the second guiding section; wherein, a sealing groove is formed between the end surface of the first guiding section near the valve port and the cavity wall of the guiding sleeve cavity, and the sealing assembly is received in the sealing groove.

[0015] According to one embodiment of the present disclosure, axially, the length of the first guiding section is greater than that of the second guiding section.

[0016] As can be seen from the above technical solutions, the advantages and positive effects of the electronic expansion valve proposed by the present disclosure are as follows:

[0017] The electronic expansion valve proposed by the present disclosure includes a valve body, a guiding assembly, and a valve assembly; the valve body is provided with a valve cavity, and the valve cavity is provided with a valve port; the guiding assembly includes a guiding sleeve and a guiding column; the guiding sleeve is disposed in the valve cavity and is provided with a guiding sleeve cavity, a part of the guiding column is disposed in the guiding sleeve cavity, and the other part extends out of the guiding sleeve cavity away from the valve port; an assembly step is provided on the outer periphery of the guiding column, and an assembly groove is provided on the cavity wall of the guiding sleeve cavity at the end away from the valve port. The assembly step is received in the assembly groove and is connected by welding, and a groove is provided on the surface of the assembly step facing away from the valve port. Through the above design, when the assembly step and the assembly groove are welded and connected in the present disclosure, the groove can be used to block the heat conduction of the welding, avoiding deformation of the guiding surface of the guiding column for cooperating with the valve assembly, and ensuring the guiding effect of the guiding column on the valve assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By considering the following detailed description of the preferred embodiments of the present disclosure in conjunction with the drawings, various objectives, features, and advantages of the present disclosure will become more apparent. The drawings are only exemplary illustrations of the present disclosure and are not necessarily drawn to scale. In the drawings, the same reference numerals always represent the same or similar components. Among them:

[0019] Figure 1 is a cross-sectional schematic view of an electronic expansion valve shown according to an exemplary embodiment;

[0020] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0021] Figure 3 is Figure 2 an enlarged schematic view of part B in

[0022] Figure 4 is Figure 2 an enlarged schematic view of part C in

[0023] Figure 5 Yes Figure 4 It is an enlarged schematic view of part D in

[0024] The description of the reference numerals in the drawings is as follows:

[0025] 100. Valve body; 311. Balance channel;

[0026] 110. Valve cavity; 320. Axial core screw;

[0027] 111. Valve port; 330. Elastic member;

[0028] 210. Guide sleeve; 400. Nut assembly;

[0029] 211. Guide sleeve cavity; 510. Sealing ring;

[0030] 212. Assembly groove; 511. Third region;

[0031] 213. Third chamfer structure; 512. Fourth region;

[0032] 214. First region; 513. First chamfer structure;

[0033] 215. Second region; 514. Second chamfer structure;

[0034] 220. Guide post; 520. O-ring;

[0035] 221. First guide section; 600. Driving mechanism;

[0036] 2211. Assembly step; d. Cross-sectional diameter;

[0037] 2212. Groove; h1. Groove depth;

[0038] 222. Second guide section; h2. Thickness;

[0039] 223. Guide post cavity; w1. Cross-sectional width;

[0040] 230. Sealing groove; w2. Groove width;

[0041] 310. Valve needle; w3. Distance;

[0042] w4. Width. Specific embodiments

[0043] Typical embodiments embodying the features and advantages of the present disclosure will be described in detail in the following description. It should be understood that the present disclosure can have various changes in different embodiments, all of which do not depart from the scope of the present disclosure, and the descriptions and drawings therein are for illustrative purposes in nature and not for limiting the present disclosure.

[0044] In the following description of different exemplary embodiments of the present disclosure, reference is made to the accompanying drawings, which form a part of the present disclosure, and in which different exemplary structures, systems, and steps for implementing various aspects of the present disclosure are shown by way of example. It should be understood that other specific solutions of components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of the present disclosure. Moreover, although terms such as "above", "between", "within", etc. may be used in this specification to describe different exemplary features and elements of the present disclosure, these terms are used herein only for convenience, for example, according to the directions of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present disclosure.

[0045] Refer to Figure 1 , which representatively shows a cross-sectional schematic diagram of the electronic expansion valve proposed by the present disclosure. In this exemplary embodiment, the electronic expansion valve proposed by the present disclosure is described by taking its application in a high-pressure refrigerant system or an ultra-high-pressure refrigerant system as an example. It is easy for those skilled in the art to understand that, in order to apply the relevant designs of the present disclosure to other types of refrigerant systems or other devices, various modifications, additions, substitutions, deletions, or other changes are made to the following specific embodiments, and these changes are still within the scope of the principle of the electronic expansion valve proposed by the present disclosure.

[0046] As Figure 1 shown, in an embodiment of the present disclosure, the electronic expansion valve proposed by the present disclosure includes a valve body 100, a guiding assembly, and a valve assembly. Referring in conjunction with Figures 2 to 5 , Figure 2 represents an enlarged schematic diagram of part A in Figure 1 ; Figure 3 represents an enlarged schematic diagram of part B in Figure 2 ; Figure 4 represents an enlarged schematic diagram of part C in Figure 2 ; Figure 5 represents an enlarged schematic diagram of part D in Figure 4 .

[0047] As Figures 1 to 3As shown, in an embodiment of the present disclosure, the valve body 100 is provided with a valve cavity 110, and the valve cavity 110 is provided with a valve port 111. The guiding assembly is disposed in the valve cavity 110, and the guiding assembly includes a guiding sleeve 210 and a guiding column 220. The guiding sleeve 210 is disposed in the valve cavity 110, the guiding sleeve 210 is provided with a guiding sleeve cavity 211, a part of the guiding column 220 is disposed in the guiding sleeve cavity 211, another part of the guiding column 220 extends out of the guiding sleeve cavity 211 away from the valve port 111, and the guiding column 220 is provided with a guiding column cavity 223. On this basis, an assembly step 2211 is provided on the outer periphery of the guiding column 220, and an assembly groove 212 is provided on the cavity wall of the guiding sleeve cavity 211 at the end away from the valve port 111. The assembly step 2211 is received in the assembly groove 212 and is connected by welding. Among them, a groove 2212 is provided on the surface of the assembly step 2211 facing away from the valve port 111. The valve assembly part is disposed in the guiding column cavity 223 of the guiding column 220, and both ends of the valve assembly extend out of the guiding assembly respectively. The valve assembly is used to open or close the valve port 111. Through the above design, when the assembly step 2211 and the assembly groove 212 are welded and connected in the present disclosure, the groove 2212 can be used to block the heat conduction of the welding, avoiding the deformation of the guiding surface of the guiding column 220 for cooperating with the valve assembly (such as the nut assembly 400 of the valve assembly), and ensuring the guiding effect of the guiding column 220 on the valve assembly.

[0048] Specifically, on the one hand, the welding connection method can realize the connection between the guiding column 220 and the guiding sleeve 210, and on the other hand, it can realize the sealing of the connection part through an annular welding path, further enhancing the sealing effect between the guiding column 220 and the guiding sleeve 210. On this basis, when the guiding sleeve 210 and the guiding column 220 are connected by welding, it will cause poor coaxiality of the guiding column 220, and the welding process will heat the guiding column 220, causing the outer side wall of the guiding column 220 to deform under the influence of heat, affecting the guiding function of the guiding column 220 on the nut assembly 400. Further, since the nut assembly 400 is press-fitted between the outer side wall of the guiding column 220 (such as the second guiding section 222), the deformation of the guiding column 220 under the influence of heat will cause difficulty in press-fitting the nut assembly 400, and the positioning of the nut assembly 400 is inaccurate. After the nut assembly 400 is installed, the position is skewed, resulting in unsmooth movement of the mandrel screw and jamming. In addition, when the inner surface of the guiding column 220 (i.e., the cavity wall of the guiding column cavity 223) is deformed greatly under the influence of heat, it will also cause unsmooth movement and jamming of the elastic member 330 inside the guiding column cavity 223. Therefore, by providing the groove 2212 on the guiding column 220 in the present disclosure, on the one hand, it can block heat conduction and reduce the influence of welding on the coaxiality of the guiding column 220, and on the other hand, it can provide a deformation space for the deformation occurring outside the groove 2212, avoiding the deformation outside the groove 2212 from being transmitted into the groove 2212 and affecting the coaxiality of the guiding column 220.

[0049] As Figure 4 shown, in an embodiment of the present disclosure, the valve assembly may include a valve head assembly and a nut assembly 400. Specifically, the nut assembly 400 is disposed on a portion of the guide post 220 that extends out of the guide sleeve cavity 211 away from the valve port 111, and the nut assembly 400 is in guiding cooperation with the guide post 220. A part of the valve head assembly is disposed in the guide post cavity 223. Both ends of the valve head assembly may extend out of the guiding assembly respectively. One end of the valve head assembly is in screwed cooperation with the nut assembly 400 so that the valve head assembly can move axially when rotating. The other end of the valve head assembly is used to open and close the valve port 111. Accordingly, since the valve head assembly is in screwed cooperation with the nut assembly 400, and since the nut assembly 400 is fixed relative to the valve body 100 and the guiding assembly, when the valve head assembly rotates, the valve head assembly can move axially. It should be noted that different from the driving mode in this embodiment where the nut assembly 400 is fixed and the core screw 320 drives the valve head assembly to move, when the valve assembly includes a valve head assembly and a nut assembly 400, other driving modes can also be adopted for the electronic expansion valve proposed in the present disclosure. For example, the core screw 320 can rotate circumferentially but is axially fixed relative to the valve body, and the valve head assembly and the nut assembly 400 can move axially but are circumferentially fixed relative to the valve body.

[0050] As Figure 2 shown, in an embodiment of the present disclosure, the valve head assembly includes a valve needle 310 and a core screw 320. The first end of the valve needle 310 (for example, the end facing the valve port 111) extends out of the guiding assembly. One end of the core screw 320 is connected to the second end of the valve needle 310 (for example, the end facing away from the valve port 111). The core screw 320 is driven by a driving mechanism 600 to rotate around the axial direction, and the core screw 320 is in screwed cooperation with the nut assembly 400. Accordingly, since the core screw 320 is in screwed cooperation with the nut assembly 400, and since the nut assembly 400 is fixed relative to the valve body 100 and the guiding assembly, when the core screw 320 rotates, the core screw 320 can move axially, thereby driving the valve needle 310 to move axially. Accordingly, the first end of the valve needle 310 can open or close the valve port 111.

[0051] As Figure 5 shown, in an embodiment of the present disclosure, the welding position of the assembly step 2211 and the assembly groove 212 may be between one end of the outer peripheral surface of the assembly step 2211 away from the valve port and one end of the inner peripheral groove wall of the assembly groove 212 away from the valve port. Among them, the welding method of the assembly step 2211 and the assembly groove 212 may be laser welding.

[0052] As Figure 5As shown, in an embodiment of the present disclosure, a part of the guide post 220 and the inner wall of the guide sleeve cavity 211 may be in interference fit. On this basis, there may be a clearance fit between the outer peripheral surface of the assembly step 2211 and the inner peripheral groove wall of the assembly groove 212. Through the above design, the present disclosure adopts an interference fit between a part of the guide post 220 and the inner wall of the guide sleeve cavity 211, which can strengthen the assembly effect of the guide post 220 and the guide sleeve cavity 211. On this basis, the present disclosure adopts a clearance fit between the outer peripheral surface of the assembly step 2211 and the inner peripheral groove wall of the assembly groove 212, which can avoid the coaxiality problem caused by both of the above two mating parts being in interference fit, resulting in difficult installation.

[0053] It should be noted that the above clearance fit refers to the mating state when the guide sleeve 210 and the guide post 220 are assembled (that is, the guide post 220 is partially inserted into the guide sleeve cavity 211 and the assembly step 2211 is received in the assembly groove 212) and before welding. It should be understood that when the outer peripheral surface of the assembly step 2211 and the inner peripheral groove wall of the assembly groove 212 are welded, the structural form of the above-mentioned mating part observed from the cross-section of the electronic expansion valve may not exactly match the above description, but it does not limit the application of the present disclosure in related embodiments.

[0054] As Figure 5 shown, in an embodiment of the present disclosure, the assembly step 2211 may be provided with a groove 2212 along the circumferential direction, and the groove 2212 may be circular. In some embodiments, the assembly step 2211 may also be provided with at least two grooves 2212 along the circumferential direction, the grooves 2212 may also be circular, and at least two grooves 2212 may be distributed at intervals in the radial direction, for example, at least two circular grooves 2212 with different diameters are sleeved at intervals. Alternatively, the assembly step 2211 may also be provided with at least two grooves 2212 at circumferential intervals, and at this time the grooves 2212 may be arc-shaped, and at least two grooves 2212 may be arranged at intervals along the same circular path.

[0055] As Figure 5As shown, in an embodiment of the present disclosure, along the radial direction, the proportion of the groove width w2 of the groove 2212 in the width w4 of the assembly step 2211 can be 1 / 4 to 3 / 4, such as 1 / 4, 1 / 2, 5 / 8, 3 / 4, etc. Herein, the width w4 of the assembly step 2211 can be understood as the radial distance between the outer periphery of the assembly step 2211 and the outer periphery of the second guiding section 222. Through the above design, the present disclosure can avoid the groove width w2 of the groove 2212 being too small, resulting in insufficient heat resistance or deformation transfer blocking ability. At the same time, the present disclosure can avoid the groove width w2 of the groove 2212 being too large, which may affect the structural strength of the assembly step 2211, ensuring the assembly strength between the guiding sleeve 210 and the guiding column 220. In some embodiments, the proportion of the groove width w2 of the groove 2212 in the width w4 of the assembly step 2211 can also be less than 1 / 4, or greater than 3 / 4, such as 1 / 5, 4 / 5, etc., and is not limited to this embodiment.

[0056] As Figure 5 shown, in an embodiment of the present disclosure, along the radial direction, the distance w3 between the outer edge of the groove 2212 and the outer edge of the assembly step 2211, in the width of the assembly step 2211, can be greater than or equal to 1 / 4, such as 1 / 4, 1 / 3, 1 / 2, 5 / 8, etc. Through the above design, the present disclosure can avoid the proportion of the distance w3 in the width of the assembly step 2211 being too small, resulting in the groove 2212 being too close to the outer edge of the assembly step 2211, ensuring the structural strength of the assembly step 2211. At the same time, the present disclosure can avoid the proportion of the distance w3 in the width of the assembly step 2211 being too large, resulting in a small space for arranging the groove 2212 on the assembly step 2211. In some embodiments, the proportion of the distance w3 between the outer edge of the groove 2212 and the outer edge of the assembly step 2211 in the width of the assembly step 2211 can also be less than 1 / 4, such as 1 / 5 mm, etc., and is not limited to this embodiment.

[0057] As Figure 5 shown, based on the design of the groove 2212 provided on the assembly step 2211, in an embodiment of the present disclosure, along the axial direction, the proportion of the groove depth h1 of the groove 2212 in the thickness h2 of the assembly step 2211 can be 1 / 3 to 1 / 2, such as 1 / 3, 3 / 8, 2 / 5, 1 / 2, etc. Through the above design, the present disclosure can avoid the groove depth h1 of the groove 2212 being too small, resulting in insufficient heat resistance or deformation transfer blocking ability. At the same time, the present disclosure can avoid the groove depth h1 of the groove 2212 being too large, which may affect the structural strength of the assembly step 2211, ensuring the assembly strength between the guiding sleeve 210 and the guiding column 220. In some embodiments, the proportion of the groove depth h1 of the groove 2212 in the thickness h2 of the assembly step 2211 can also be less than 1 / 3, or greater than 1 / 2, such as 3 / 10, 11 / 20, etc., and is not limited to this embodiment.

[0058] As Figure 5 shown, based on the mating design of the assembly step 2211 and the assembly groove 212, in an embodiment of the present disclosure, a third chamfer structure 213 may be provided on the cavity wall of the guide sleeve cavity 211, and the third chamfer structure 213 is adjacent to one end of the assembly groove 212 close to the valve port 111. For example, the third chamfer structure 213 may be the chamfered structure shown in the figure, or may also be a rounded chamfer structure. Through the above design, during the assembly process of the guide post 220 and the guide sleeve 210 (for example, during the process of inserting the guide post 220 into the guide sleeve cavity 211), the present disclosure can use the third chamfer structure 213 to guide the guide post 220, further reducing the assembly difficulty.

[0059] As Figure 5As shown, based on the design in which the cavity wall of the guide sleeve cavity 211 is provided with a third chamfer structure 213, in an embodiment of the present disclosure, the portion of the cavity wall of the guide sleeve cavity 211 that is not provided with the assembly groove 212 and the third chamfer structure 213 may have a first region 214 and a second region 215, and the first region 214 and the second region 215 are distributed axially, and the first region 214 is located between the third chamfer structure 213 and the second region 215. On this basis, the first region 214 of the guide sleeve cavity 211 and the guide post 220 may be in clearance fit, and moreover, the second region 215 of the guide sleeve cavity 211 and the guide post 220 may be in interference fit. Through the above design, considering the installation methods of the sealing ring 510 and the O-ring 520, the guide sleeve 210 can be first assembled with the valve body 100 (for example, by furnace welding), then the sealing ring 510 and the O-ring 520 are placed into the guide sleeve 210, and then the guide post 220 is inserted into the guide sleeve 210. After the guide post 220 and the guide sleeve 210 are assembled, a sealing groove 230 is jointly formed. The guide post 220 and the guide sleeve 210 are in clearance fit at one end away from the valve port 111 (i.e., the upper end shown in the drawing). Accordingly, although the guide sleeve 210 is provided with the third chamfer structure 213, during the installation process of the guide post 220, phenomena such as press-fitting skew and incomplete press-fitting may still occur. The present disclosure adopts the above clearance fit design, which can utilize the guide sleeve 210 to provide a self-guiding effect for the installation of the guide post 220, achieving the design purpose of good press-fitting and not requiring a guide press-fitting tooling. Furthermore, since the guide post 220 is subject to an upward pressure difference (when the valve needle 310 is provided with a balance channel as shown in the figure, the fluid pressure at the lower end of the guide post 220 is greater than the fluid pressure at its upper end, so the guide post 220 is actually subject to an upward pressure difference, that is, a pressure difference away from the valve port 111, such as a pressure difference of 10 MPa), the present disclosure adopts an interference fit between the guide post 220 and the guide sleeve 210 at one end close to the valve port 111 (i.e., the lower end shown in the drawing), which can overcome the influence of the above pressure difference on the assembly strength between the guide post 220 and the guide sleeve 210, further ensuring the assembly strength between the two, and at the same time ensuring the coaxiality between the guide post 220 and the guide sleeve 210.

[0060] As Figure 2As shown, in an embodiment of the present disclosure, the electronic expansion valve proposed by the present disclosure further includes a sealing assembly, which is disposed between the guiding assembly and the valve head assembly (such as the valve needle 310). On this basis, the sealing assembly may include a sealing ring 510 and an O-ring 520. The sealing ring 510 is located between the inner circumference of the O-ring 520 and the valve needle 310. The so-called "O-shaped" means that the cross-section of the O-ring 520 is circular (i.e., the contour of the cross-section is "O" shaped). Through the above design, the present disclosure uses the sealing ring 510 and the O-ring 520 to form a sealing assembly to achieve the sealing function between the guiding assembly and the valve needle 310, and can use the design of the sealing ring 510 to prevent the O-ring 520 from being extruded and deformed in a high-pressure environment, ensuring the stability and reliability of the sealing function of the electronic expansion valve.

[0061] As Figure 2 shown, in an embodiment of the present disclosure, the guiding column 220 has a first guiding section 221 and a second guiding section 222 distributed along the axial direction. The first guiding section 221 is disposed in the guide sleeve cavity 211, and the second guiding section 222 extends out of the guide sleeve cavity 211 in the direction away from the valve port 111, and the second guiding section 222 is used for arranging the nut assembly 400. On this basis, the assembly step 2211 may be located at the connection between the first guiding section 221 and the second guiding section 222. Accordingly, a sealing groove 230 is formed between the end face of the first guiding section 221 close to the valve port 111 and the cavity wall of the guide sleeve cavity 211, and the sealing assembly is accommodated in the sealing groove 230. Through the above design, the present disclosure uses the cooperation of the guide sleeve 210 and the guiding column 220 to form a sealing groove 230 for accommodating the sealing assembly, without additionally grooving on the guide sleeve 210 or the guiding column 220, which is beneficial to simplifying the structural complexity and reducing the processing difficulty of parts. In some embodiments, in order to arrange the sealing groove 230 for accommodating the sealing assembly, it may also be achieved by grooving on the guide sleeve 210 or the guiding column 220, and it is not limited to this embodiment.

[0062] As Figure 2 shown, based on the design of the above-mentioned sealing groove 230, in an embodiment of the present disclosure, along the axial direction, the length of the first guiding section 221 may be greater than the length of the second guiding section. Through the above design, the present disclosure can extend the distance between the sealing groove (i.e., the sealing position between the guiding assembly and the valve head assembly) and the welding joint (i.e., the welding position between the guide sleeve 210 and the guiding column 220), thereby reducing the thermal influence of welding on the sealing assembly.

[0063] As Figure 2 and Figure 4 shown, based on the design that the guiding column 220 has a first guiding section 221 and a second guiding section 222, in an embodiment of the present disclosure, the wall thickness of the first guiding section 221 may be greater than the wall thickness of the second guiding section 222.

[0064] In an embodiment of the present disclosure, at least a part of the inner circumference of the sealing ring 510 may be a conical inner ring surface, and the inner diameter of the end of the conical inner ring surface away from the valve port 111 is greater than the inner diameter of the end thereof close to the valve port 111. In other words, at least the end of the conical inner ring surface of the inner circumference of the sealing ring 510 close to the valve port 111 and the adjacent area are in contact with the outer circumference of the valve needle 310.

[0065] It should be noted that the description of the shape of the sealing ring 510 in this specification takes the structural form of the sealing ring 510 when it is not assembled as an example. It should be understood that when the sealing ring 510 is assembled, or after the electronic expansion valve has been used for a period of time, the structural form of the sealing ring 510 observed from the cross-section of the electronic expansion valve or the structural form of the disassembled sealing ring 510 may not exactly match the above description, but this does not limit the application of the present disclosure in related embodiments.

[0066] In an embodiment of the present disclosure, the material of the sealing ring 510 may be PTFE (polytetrafluoroethylene, Polytetrafluoro-Ethylene, chemical formula: (C2F4) n )

[0067] It should be noted here that the electronic expansion valves shown in the drawings and described in this specification are only a few examples of the many electronic expansion valves that can adopt the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details of the electronic expansion valves shown in the drawings or described in this specification or any components of the electronic expansion valves.

[0068] In summary, the electronic expansion valve proposed by the present disclosure includes a valve body 100, a guiding assembly, and a valve assembly; the valve body 100 is provided with a valve cavity 110, and the valve cavity 110 is provided with a valve port 111; the guiding assembly includes a guiding sleeve 210 and a guiding column 220; the guiding sleeve 210 is disposed in the valve cavity 110 and is provided with a guiding sleeve cavity 211, a part of the guiding column 220 is disposed in the guiding sleeve cavity 211, and the other part thereof extends out of the guiding sleeve cavity 211 away from the valve port 111; an assembly step 2211 is disposed on the outer circumference of the guiding column 220, an assembly groove 212 is disposed on the cavity wall of the guiding sleeve cavity 211 at the end away from the valve port 111, the assembly step 2211 is received in the assembly groove 212 and is connected by welding, and a groove 2212 is disposed on the surface of the assembly step 2211 on the side away from the valve port 111. Through the above design, when the assembly step 2211 is welded to the assembly groove 212, the present disclosure can utilize the groove 2212 to block the heat conduction of the welding, avoid deformation of the guiding surface of the guiding column 220 for cooperating with the valve assembly, and ensure the guiding effect of the guiding column 220 on the valve assembly.

[0069] Exemplary embodiments of the electronic expansion valve proposed by the present disclosure have been described and / or illustrated in detail above. However, the embodiments of the present disclosure are not limited to the specific embodiments described herein. On the contrary, the components and / or steps of each embodiment can be used independently and separately from the other components and / or steps described herein. Each component and / or each step of one embodiment can also be used in combination with the other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated herein, the terms "a", "an", and "the above" etc. are used to indicate the existence of one or more elements / components / etc. The terms "comprising", "including", and "having" are used to mean an open inclusion and refer to the existence of additional elements / components / etc. in addition to the listed elements / components / etc. Further, the terms "first" and "second" etc. in the claims and the specification are used only as labels and are not numerical limitations on their objects.

[0070] Although the electronic expansion valve proposed by the present disclosure has been described according to different specific embodiments, those skilled in the art will recognize that modifications can be made to the embodiments of the present disclosure within the spirit and scope of the claims.

Claims

1. An electronic expansion valve, characterized in that: It includes a valve body (100), a guiding component and a valve component; The valve body (100) is provided with a valve cavity (110), and the valve cavity (110) is provided with a valve port (111); The guiding component is arranged in the valve cavity (110), and the guiding component includes a guiding sleeve (210) and a guiding column (220); the guiding sleeve (210) is arranged in the valve cavity (110) and is provided with a guiding sleeve cavity (211), a part of the guiding column (220) is arranged in the guiding sleeve cavity (211), and the other part extends out of the guiding sleeve cavity (211) away from the valve port (111), and the guiding column (220) is provided with a guiding column cavity (223); An assembly step (2211) is arranged on the outer periphery of the guiding column (220), an assembly groove (212) is arranged on the cavity wall of the guiding sleeve cavity (211) at the end away from the valve port (111), the assembly step (2211) is received in the assembly groove (212) and is connected by welding, and a groove (2212) is arranged on the surface of the assembly step (2211) on the side away from the valve port (111); Part of the valve component is arranged in the guiding column cavity (223), and both ends thereof extend out of the guiding component respectively, and the valve component is used to open and close the valve port (111).

2. The electronic expansion valve according to claim 1, wherein The welding position of the assembly step (2211) and the assembly groove (212) is between the outer peripheral surface of the assembly step (2211) at the end away from the valve port (111) and the inner peripheral groove wall of the assembly groove (212) at the end away from the valve port (111).

3. The electronic expansion valve according to claim 1, wherein, A part of the guiding column (220) and the inner wall of the guiding sleeve cavity (211) are in interference fit; wherein, there is a clearance fit between the outer peripheral surface of the assembly step (2211) and the inner peripheral groove wall of the assembly groove (212).

4. The electronic expansion valve according to claim 1, characterized in that: One groove (2212) is arranged on the assembly step (2211) along the circumferential direction, and the groove (2212) is in a circular ring shape; or At least two grooves (2212) are arranged on the assembly step (2211) along the circumferential direction, the grooves (2212) are in a circular ring shape, and at least two grooves (2212) are distributed at intervals in the radial direction; or At least two grooves (2212) are arranged on the assembly step (2211) along the circumferential direction, the grooves (2212) are in an arc shape, and at least two grooves (2212) are arranged at intervals along the same circular path.

5. The electronic expansion valve according to claim 1, characterized in that: Along the radial direction, the groove width (w2) of the groove (2212) accounts for 1 / 4 to 3 / 4 of the width of the assembly step (2211); and / or Along the radial direction, the distance (w3) between the outer edge of the groove (2212) and the outer edge of the assembly step (2211) accounts for greater than or equal to 1 / 4 of the width of the assembly step (2211); and / or Axially, the groove depth (h1) of the groove (2212) accounts for 1 / 3 to 1 / 2 of the thickness (h2) of the assembly step (2211).

6. The electronic expansion valve according to claim 1, wherein, The cavity wall of the guide sleeve cavity (211) is provided with a third chamfer structure (213), and the third chamfer structure (213) is adjacent to one end of the assembly groove (212) close to the valve port (111).

7. The electronic expansion valve according to claim 6, characterized in that, The part of the cavity wall of the guide sleeve cavity (211) without the assembly groove (212) and the third chamfer structure (213) has a first region (214) and a second region (215). The first region (214) and the second region (215) are distributed axially, and the first region (214) is located between the third chamfer structure (213) and the second region (215). Among them, the first region (214) of the guide sleeve cavity (211) has a clearance fit with the guide post (220), and the second region (215) of the guide sleeve cavity (211) has an interference fit with the guide post (220).

8. The electronic expansion valve according to any one of claims 1 to 7, characterized in that, The valve assembly includes a valve head assembly and a nut assembly (400). The nut assembly (400) is arranged on the part of the guide post (220) extending out of the guide sleeve cavity (211), and is in guiding cooperation with the guide post (220). Part of the valve head assembly is arranged in the guide post cavity (223), and one end of it is in screw connection with the nut assembly (400) so that the valve head assembly can move axially when rotating, and the other end is used to open and close the valve port (111).

9. The electronic expansion valve according to any one of claims 1 to 7, characterized in that, The electronic expansion valve further includes a sealing assembly, and the sealing assembly is arranged between the guiding assembly and the valve assembly. Among them, the sealing assembly includes a sealing ring (510) and an O-ring (520), and the sealing ring (510) is located between the inner circumference of the O-ring (520) and the valve assembly.

10. The electronic expansion valve according to claim 9, characterized in that, The guide post (220) has a first guiding section (221) and a second guiding section (222) distributed axially. The first guiding section (221) is arranged in the guide sleeve cavity (211), and the second guiding section (222) extends out of the guide sleeve cavity (211) away from the valve port (111). The assembly step (2211) is located at the connection between the first guiding section (221) and the second guiding section (222). Among them, a sealing groove (230) is formed between the end face of the first guiding section (221) close to the valve port (111) and the cavity wall of the guide sleeve cavity (211), and the sealing assembly is accommodated in the sealing groove (230).

11. The electronic expansion valve according to claim 10, characterized in that, Axially, the length of the first guiding section (221) is greater than the length of the second guiding section (222).

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