Electronic expansion valve

Abstract

An electronic expansion valve comprises a rotor assembly (100), a lead screw (200), a valve element assembly (300) and a valve seat assembly (400), the rotor assembly (100) is connected with the lead screw (200), the lead screw (200) is connected with the valve element assembly (300), and the valve element assembly (300) can move in the axial direction of the lead screw (200) relative to the valve seat assembly (400); the valve element assembly (300) comprises a sliding fit piece (310) and a valve needle assembly (320). The sliding matching part (310) comprises a main body part (314) and a connecting part (315), the main body part (314) is an injection molding part, the connecting part (315) is a metal part, one end of the connecting part (315) is fixedly connected to the main body part (314), and the other end of the connecting part (315) is connected with the valve needle assembly (320).

Description

Electronic expansion valve

[0001] Related applications

[0002] This application claims priority to Chinese patent applications filed on November 30, 2023, with application number 202323281194.0, titled “Electronic Expansion Valve”; filed on June 19, 2023, with application number 202321595997.0, titled “Electronic Expansion Valve”; filed on November 30, 2023, with application number 202311636878.X, titled “Electronic Expansion Valve”; filed on November 30, 2023, with application number 202323267306.7, titled “Electronic Expansion Valve”; and filed on November 30, 2023, with application number 202323281205.5, titled “Electronic Expansion Valve”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of valve body technology, and in particular to an electronic expansion valve. Background Art

[0004] Existing electronic expansion valves generally achieve up and down movement of the valve core through the relative spiral operation of a nut and a screw, and generally use a screw to fix the valve core. One screw can only fix a valve core of one specification, that is, one screw cannot be used for valve cores of multiple different specifications.

[0005] Summary of the Invention

[0006] Based on this, it is necessary to provide an electronic expansion valve to solve the problem of low connection strength between the screw rod and the valve core.

[0007] The present application provides an electronic expansion valve, which includes a rotor assembly, a screw rod, a valve core assembly and a valve seat assembly, wherein the valve core assembly can move relative to the valve seat assembly along the axial direction of the screw rod, the rotor assembly is connected to the screw rod, and the screw rod is connected to the valve core assembly, and the valve core assembly can move relative to the valve seat assembly along the axial direction of the screw rod; the valve core assembly includes a sliding fitting and a valve needle assembly; the sliding fitting includes a main body and a connecting part, the main body is an injection-molded part, and the connecting part is a metal part, one end of the connecting part is fixedly connected to the main body, and the other end is connected to the valve needle assembly.

[0008] Compared with the prior art, the same sliding fitting can be matched with valve needle assemblies of different specifications, that is, only one sliding fitting needs to be manufactured to adapt to valve needle assemblies of different specifications;

[0009] Furthermore, the main body is an injection-molded part, significantly reducing the weight of the sliding element and simplifying its processing. The metal connection facilitates welding the sliding element to the valve needle assembly, thereby increasing the strength of the connection between the sliding element and the valve needle assembly.

[0010] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to better describe and illustrate the embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the accompanying drawings should not be considered to limit the scope of the disclosed inventions, the presently described embodiments and / or examples, and any of the best modes currently understood for these inventions.

[0012] FIG1 is a schematic diagram of a partial structure of an electronic expansion valve according to an embodiment of the present application.

[0013] FIG2 is a cross-sectional view of an electronic expansion valve according to an embodiment of the present application.

[0014] FIG3 is a cross-sectional view of an electronic expansion valve according to another embodiment of the present application.

[0015] FIG4 is a schematic structural diagram of a sliding fitting according to another embodiment of the present application.

[0016] FIG5 is a schematic diagram of a partial structure of an electronic expansion valve according to an embodiment of the present application.

[0017] FIG6 is a cross-sectional view of an electronic expansion valve according to another embodiment of the present application.

[0018] Reference numerals: 100, rotor assembly; 200, screw rod; 300, valve core assembly; 310, sliding fitting; 311, anti-rotation protrusion; 314, main body; 3141, clamping groove; 3142, first clamping groove; 3143, limiting protrusion; 3144, second clamping groove; 315, connecting portion; 3151, cylinder; 3152, flange; 3153, limiting clamping groove; 320, valve needle assembly; 321, First valve needle; 3221, regulating valve port; 322, second valve needle; 3222, movable cavity; 3223, first core; 3224, second core; 3225, first channel; 3226, connecting groove; 3227, connecting hole; 323, buffer gasket; 3231, through hole; 324, annular assembly groove; 3241, elastic sealing ring; 400, valve seat assembly; 410, valve port; 420, valve cavity; 510, stop seat; 5101, outer Guide rail portion; 511, outer guide rail portion; 512, stop body; 513, first connecting insert; 514, second connecting insert; 515, guide groove; 520, stop ring; 521, moving ring body; 522, stop head; 523, first head portion; 524, second head portion; 530, guide rod; 540, first stop portion; 541, annular fixing ring; 542, stop ridge; 550, second stop portion; 600, driving mechanism; 800, housing. DETAILED DESCRIPTION

[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0021] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0022] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Please refer to Figures 1 to 4. The electronic expansion valve includes a rotor assembly 100, a screw rod 200, a valve core assembly 300 and a valve seat assembly 400. The valve seat assembly 400 is provided with a valve mouth portion 410. The valve core assembly 300 can move axially relative to the valve seat assembly 400 along the screw rod 200. One end of the screw rod 200 is fixedly connected to the rotor assembly 100, and the other end is connected to the valve core assembly 300. The rotor assembly 100 can drive the valve core assembly 300 to move toward or away from the valve mouth portion 410 through the screw rod 200.

[0026] Specifically, the electronic expansion valve further includes a stopper seat 510, a stop ring 520, and a guide rod 530. The stopper seat 510 is fixedly connected to the end of the valve seat assembly 400 away from the valve port 410 and is disposed on the outer periphery of the screw rod 200. An outer guide rail portion 511 is provided on the outer periphery of the stopper seat 510 facing away from the screw rod 200. The stop ring 520 is sleeved on the outer periphery of the stopper seat 510 and is movably threadedly engaged with the outer guide rail portion 511. The guide rod 530 is fixedly connected to the rotor assembly 100 or the screw rod 200, so that the rotor assembly 100 can drive the guide rod 530 to push the stop ring 520 to spirally move along the outer guide rail portion 511. Furthermore, the screw rod 200 and the valve core assembly 300 are movably threadedly engaged.

[0027] The valve core assembly 300 includes a sliding fitting 310 and a valve needle assembly 320 . One end of the screw rod 200 away from the rotor assembly 100 is threadedly fitted with the sliding fitting 310 .

[0028] Specifically, the sliding fitting 310 and the stop seat 510 are slidably fitted along the axial direction of the screw rod 200 , so that the screw rod 200 can drive the sliding fitting 310 to drive the valve core assembly 300 to open or close the valve port 410 .

[0029] The sliding fitting 310 includes a main body 314 and a connecting part 315. The main body 314 is an injection molded part, and the connecting part 315 is a metal part. The sliding fitting 310 is threadedly connected to the screw rod 200 through the main body 314. One end of the connecting part 315 is fixedly connected to the main body 314, and the other end is welded to the valve needle assembly 320.

[0030] The main body 314 is an injection-molded part, significantly reducing the weight of the sliding member 310 and simplifying its processing. The connecting portion 315 is a metal component, facilitating welding of the sliding member 310 to the valve needle assembly 320 via the connecting portion 315, thereby enhancing the connection strength between the sliding member 310 and the valve needle assembly 320. Furthermore, this arrangement allows the same sliding member 310 to be compatible with valve needle assemblies 320 of varying specifications. In other words, only one sliding member 310 needs to be manufactured to accommodate valve needle assemblies 320 of varying specifications.

[0031] It should be noted that the electronic expansion valve further includes a housing 800 , which covers the outside of the rotor assembly 100 , a portion of the lead screw 200 , and a portion of the valve core assembly 300 and is welded to the valve seat.

[0032] Specifically, the connecting portion 315 can be made of copper, stainless steel, aluminum or other alloy materials, which are not listed here one by one.

[0033] In one embodiment, the connecting portion 315 is embedded in the main body 314 .

[0034] Specifically, in one embodiment, the connecting portion (315) and the main body (314) are integrally injection molded to form the sliding fitting (310). The connecting portion 315 is embedded in the main body 314 through an integral injection molding process, thereby further reducing the difficulty of assembling the connecting portion 315 and the main body 314 and improving the connection strength between the connecting portion 315 and the main body 314.

[0035] However, the present invention is not limited thereto. In other embodiments, the connection portion 315 may be connected to the main body 314 by snapping, bonding, welding or threading.

[0036] In one embodiment, the main body 314 defines a clamping groove 3141 , one end of the connecting portion 315 is embedded in the clamping groove 3141 , and the other end extends toward the direction close to the valve needle assembly 320 and is welded to the valve needle assembly 320 .

[0037] Furthermore, in one embodiment, the connecting portion 315 includes a cylinder 3151 and a flange 3152, the cylinder 3151 and the screw rod 200 are coaxially arranged, the flange 3152 is fixed to one end of the cylinder 3151 away from the valve needle assembly 320, and one end of the flange 3152 is connected to the inner wall of the cylinder 3151, and the other end extends along the radial direction of the cylinder 3151 toward the direction close to the axis of the cylinder 3151.

[0038] The snap-in groove 3141 includes a first snap-in groove 3142 and a second snap-in groove 3144. One end of the cylinder 3151 is arranged in the first snap-in groove 3142, and the other end extends out of the first snap-in groove 3142 and is welded to the valve needle assembly 320. The second snap-in groove 3144 is arranged at one end of the first snap-in groove 3142 away from the valve needle assembly 320, and one end of the second snap-in groove 3144 is connected to the first snap-in groove 3142, and the other end extends along the radial direction of the cylinder 3151 toward the direction close to the axis of the cylinder 3151, and the flange 3152 is clamped in the second snap-in groove 3144.

[0039] In this way, the flange 3152 can be inserted into the second slot 3144 by integral injection molding. Specifically, the connecting portion 315 is placed in a mold, and then liquid plastic is injected into the mold. After the plastic solidifies and forms, the main body 314 covering the outside of the connecting portion 315 can be obtained.

[0040] With this arrangement, the flange 3152 cannot move axially along the cylinder 3151 due to the engagement of the second engaging groove 3144. Furthermore, because the flange 3152 and the cylinder 3151 are fixedly connected, the entire connecting portion 315 cannot detach from the main body 314 along the axial direction of the cylinder 3151. Furthermore, the cylinder 3151 cannot move radially due to the engagement of the first engaging groove 3142. Therefore, it can be seen from the above that the connecting portion 315 is securely connected to the main body 314.

[0041] Specifically, the cylinder 3151 and the flange 3152 are stamped parts, turned parts or welded parts.

[0042] Furthermore, in one embodiment, the cross section of the first slot 3142 is annular, and correspondingly, the cross section of the cylinder 3151 is also annular.

[0043] In this way, the shape adaptability of the connecting portion 315 and the valve needle assembly 320 is improved, which is beneficial to the welding of the sliding fitting 310 and the valve needle assembly 320 .

[0044] In one embodiment, a limiting protrusion 3143 is provided at one end of the first slot 3142 away from the valve needle assembly 320, and a limiting slot 3153 is provided on the flange 3152 corresponding to the limiting protrusion 3143, and the limiting protrusion 3143 is stopped on two opposite sides of the limiting slot 3153 along the circumference of the flange 3152.

[0045] Thus, under the stopping action of the limiting protrusion 3143, the flange 3152 cannot rotate about the axis of the cylinder 3151. In other words, the entire connecting portion 315 cannot rotate relative to the main body 314, thereby preventing wear between the connecting portion 315 and the main body 314. Furthermore, since the connecting portion 315 cannot separate from the main body 314 along the axial direction of the cylinder 3151, and the cylinder 3151 cannot move along its own radial direction, it can be seen that the connecting portion 315 and the main body 314 are completely fixedly connected.

[0046] Specifically, in one embodiment, there are multiple limiting protrusions 3143 , and the multiple limiting protrusions 3143 are evenly distributed along the circumference of the first slot 3142 .

[0047] More specifically, the number of the limiting protrusions 3143 can be two, three or four, which are not listed here one by one.

[0048] This is beneficial to the overall force balance of the sliding fitting 310 .

[0049] However, the present invention is not limited thereto. In other embodiments, the number of the limiting protrusion 3143 may also be one.

[0050] In another embodiment, the limiting slot 3153 may also pass through the flange 3152 and the cylinder 3151 in sequence.

[0051] In one embodiment, please refer to Figure 5, one end of the limiting protrusion 3143 is connected to the outer wall of the first slot 3142 away from the axis of the cylinder 3151, and the other end extends into the second slot 3144 in the direction close to the axis of the cylinder 3151, and the end of the limiting protrusion 3143 extending into the second slot 3144 respectively abuts against the side wall of the second slot 3144 close to the valve needle assembly 320 and the side wall of the second slot 3144 away from the valve needle assembly 320.

[0052] In this way, the portion of the limiting protrusion 3143 extending into the second slot 3144 can support the second slot 3144 along the axial direction of the cylinder 3151 , thereby improving the compressive strength of the main body 314 .

[0053] In one embodiment, one end of the barrel 3151 away from the flange 3152 extends out of the first slot 3142 .

[0054] In this way, it is possible to prevent the welding heat from being transferred to the main body 314 during the welding of the cylinder 3151 and the valve needle assembly 320 and affecting the structural strength of the main body 314 .

[0055] Furthermore, in one embodiment, the length of the barrel 3151 extending out of the first slot 3142 is greater than or equal to 1 mm.

[0056] Please refer to Figures 1 to 5. In one embodiment, the electronic expansion valve includes a stop seat 510, a rotor assembly 100, a screw rod 200, a valve core assembly 300 and a valve seat assembly 400. The stop seat 510 is fixedly connected to the valve seat assembly 400, and the stop seat 510 is arranged on the outer periphery of the screw rod 200. The valve seat assembly 400 is provided with a valve mouth portion 410. The valve core assembly 300 can move axially relative to the valve seat assembly 400 along the screw rod 200. One end of the screw rod 200 is fixedly connected to the rotor assembly 100, and the other end is connected to the valve core assembly 300. The rotor assembly 100 can drive the valve core assembly 300 to move toward or away from the valve mouth portion 410 through the screw rod 200.

[0057] Specifically, the electronic expansion valve also includes a stop ring 520 and a guide rod 530. The outer peripheral side of the stop seat 510 facing away from the screw 200 is further provided with an outer guide rail portion. The stop ring 520 is sleeved on the outer periphery of the stop seat 510 and movably engages with the outer guide rail portion. Specifically, the outer guide rail portion can be an outer guide rail portion 511 provided on the outer peripheral side of the stop seat 510 facing away from the screw 200. The stop ring 520 sleeves on the outer periphery of the stop seat 510 and movably engages with the outer guide rail portion 511 through a threaded connection. The outer guide rail portion can also be a coil spring (not shown) helically wound around the outer side of the stop seat 510. The stop ring 520 spirally moves along the extension direction of the coil spring. The guide rod 530 is fixedly connected to the rotor assembly 100 or the screw 200 so that the rotor assembly 100 can drive the guide rod 530 to push the stop ring 520 to spirally move along the outer guide rail portion. In addition, the screw 200 and the valve core assembly 300 are movably threadedly connected.

[0058] The valve core assembly 300 includes a sliding fitting 310 and a valve needle assembly 320. The end of the screw rod 200 away from the rotor assembly 100 is threadedly engaged with the sliding fitting 310. The sliding fitting 310 and the stop seat 510 are matched through a limiting structure, so that the screw rod 200 can drive the sliding fitting 310 to drive the valve core assembly 300 to move axially relative to the stop seat 510 along the screw rod 200 to open or close the valve mouth 410, and the limiting structure can prevent the sliding fitting 310 from rotating around the axis of the screw rod 200 relative to the stop seat 510.

[0059] Specifically, it should be noted that the upper portion (the portion close to the rotor assembly 100) and the lower portion (the portion for cooperating with the sliding fitting 310) of the stop seat 510 can be integrally formed or designed as a split part. However, in either form, the stop seat 510 is fixedly connected to the valve seat assembly (400). By providing a limiting structure, the sliding fitting 310 can be prevented from rotating relative to the stop seat 510 around the axis of the screw rod 200. At this time, the sliding fitting 310 can move relative to the screw rod 200 along the axial direction of the screw rod 200, so that the screw rod 200 drives the sliding fitting 310 to drive the valve core assembly 300 to open or close the valve port 410. This prevents the relative rotation between the sliding fitting 310 and the stop seat 510 from causing wear of the sliding fitting 310 and the stop seat 510.

[0060] It should be noted that the electronic expansion valve further includes a housing 800 , which covers the outside of the rotor assembly 100 , a portion of the lead screw 200 and a portion of the valve core assembly 300 and is welded to the valve seat assembly 400 .

[0061] In this embodiment, a radially extending anti-rotation protrusion 311 is provided on the circumference of the sliding member 310. The stop seat 510 is provided with an axially extending guide groove 515 corresponding to the anti-rotation protrusion 311. The end of the anti-rotation protrusion 311, which is distal to the sliding member 310, extends into the guide groove 515 and can slideably engage with the guide groove 515 along the axial direction of the stop seat 510, thereby ensuring that the sliding member 310 and the stop seat 510 slide in axial engagement with each other. Furthermore, the anti-rotation protrusion 311 and the guide groove 515 constitute a limiting structure.

[0062] Specifically, in one embodiment, there are multiple anti-rotation protrusions 311, and the multiple anti-rotation protrusions 311 are evenly distributed along the circumference of the sliding fitting 310. Correspondingly, there are also multiple guide grooves 515, and the multiple guide grooves 515 are evenly distributed along the circumference of the stop seat 510, and the guide grooves 515 and the anti-rotation protrusions 311 are arranged in a one-to-one correspondence.

[0063] In this way, when the side wall of the guide groove 515 restricts the rotation of the anti-rotation protrusion 311, the circumferential force of the sliding fitting 310 can be uniform, preventing the sliding fitting 310 from being deflected due to uneven force at different locations and affecting the axial displacement of the sliding fitting 310.

[0064] More specifically, the number of the anti-rotation protrusions 311 and the guide grooves 515 can be two, three, or four, etc., which are not listed here one by one.

[0065] However, the present invention is not limited thereto. In other embodiments, the number of the anti-rotation protrusion 311 may also be one, thereby greatly simplifying the structure of the electronic expansion valve.

[0066] In one embodiment, the gap between the anti-rotation protrusion 311 and the side wall of the guide groove 515 is less than or equal to 0.1 mm.

[0067] It should be noted that each guide groove 515 has two side walls arranged opposite to each other, and the gap between the anti-rotation protrusion 311 and any side wall is less than or equal to 0.1 mm.

[0068] With this arrangement, when the anti-rotation protrusion 311 changes its rotation direction, the amplitude of the collision with the side wall of the guide groove 515 is reduced, thereby reducing the wear of the anti-rotation protrusion 311 and the side wall of the guide groove 515, thereby increasing the service life of the electronic expansion valve.

[0069] In one embodiment, the stop seat 510 is provided with a first stop portion 540 . When the stop ring 520 is stopped at the first stop portion 540 , the valve core assembly 300 and the valve port portion 410 are spaced apart and stop moving.

[0070] In one embodiment, the stop seat 510 is further provided with a second stop portion 550 . When the stop ring 520 stops at the second stop portion 550 , the valve core assembly 300 abuts against the valve port 410 and closes the valve port 410 .

[0071] The provision of the first stopper 540 and the second stopper 550 effectively limits the travel of the stop ring 520 on the outer guide rail 511, thereby limiting the angular range of rotation of the guide rod 530 relative to the stop seat 510. Since the guide rod 530 is fixedly connected to the rotor assembly 100 or the screw rod 200, this arrangement effectively limits the angular range of rotation of the rotor assembly 100, thereby controlling the travel of the valve core assembly 300 relative to the valve port 410 and preventing wear on the valve core assembly 300 and the valve port 410. Furthermore, this arrangement prevents the stop ring 520 from moving outside the outer guide rail 511, thereby affecting the threaded fit between the stop ring 520 and the stop seat 510.

[0072] In one embodiment, the sliding fitting 310 includes a main body 314 and a connecting portion 315, the main body 314 is an injection molded part, and the connecting portion 315 is a metal part. The sliding fitting 310 is threadedly connected to the screw rod 200 through the main body 314, and one end of the connecting portion 315 is fixedly connected to the main body 314, and the other end is welded to the valve needle assembly 320.

[0073] The main body 314 is an injection-molded part, significantly reducing the weight of the sliding member 310 and simplifying its processing. The connecting portion 315 is a metal component, facilitating welding of the sliding member 310 to the valve needle assembly 320 via the connecting portion 315, thereby enhancing the connection strength between the sliding member 310 and the valve needle assembly 320. Furthermore, this arrangement allows the same sliding member 310 to be compatible with valve needle assemblies 320 of varying specifications. In other words, only one sliding member 310 needs to be manufactured to accommodate valve needle assemblies 320 of varying specifications.

[0074] Specifically, the connecting portion 315 can be made of copper, stainless steel, aluminum or other alloy materials, which are not listed here one by one.

[0075] In one embodiment, the connecting portion 315 is embedded in the main body 314 .

[0076] Specifically, the connection portion 315 is embedded in the main body portion 314 through an integral injection molding process, thereby further reducing the difficulty of assembling the connection portion 315 and the main body portion 314 and improving the connection strength between the connection portion 315 and the main body portion 314 .

[0077] However, the present invention is not limited thereto. In other embodiments, the connection portion 315 may be connected to the main body 314 by snapping, bonding, welding or threading.

[0078] Please refer to Figures 1 to 6. The present application provides an electronic expansion valve, which includes a rotor assembly 100, a screw rod 200, a valve core assembly 300 and a valve seat assembly 400. The valve seat assembly 400 is provided with a valve mouth portion 410. The valve core assembly 300 can move axially relative to the valve seat assembly 400 along the screw rod 200. One end of the screw rod 200 is fixedly connected to the rotor assembly 100, and the other end is threadedly connected to the valve core assembly 300. The rotor assembly 100 can drive the valve core assembly 300 to move toward or away from the valve mouth portion 410 through the screw rod 200.

[0079] The electronic expansion valve further includes a stopper seat 510, a stop ring 520, and a guide rod 530. The stopper seat 510 is fixedly connected to the valve seat assembly 400 and disposed on the outer periphery of the lead screw 200. The stopper seat 510 is provided with a first stopper portion 540. The stop ring 520 is sleeved on the outer periphery of the stopper seat 510. The guide rod 530 is fixedly connected to the rotor assembly 100 or the lead screw 200, so that the rotor assembly 100 can drive the guide rod 530 to push the stop ring 520 to spirally move along the stopper seat 510. Furthermore, when the stop ring 520 stops at the first stopper portion 540, the valve core assembly 300 and the valve port portion 410 are spaced apart and stop moving.

[0080] Specifically, the screw rod 200 and the valve core assembly 300 are movably threaded.

[0081] In one embodiment, an outer guide rail portion is further provided on the outer circumference side of the stop seat 510 away from the screw rod 200 , and the stop ring 520 is sleeved on the outer circumference of the stop seat 510 and movably cooperates with the outer guide rail portion.

[0082] Specifically, in one embodiment, the outer guide rail portion includes an outer guide rail portion 511 disposed on the outside of the stop seat 510, and the stop ring 520 is sleeved on the outer periphery of the stop seat 510 and engaged with the movable thread of the outer guide rail portion 511. The outer diameter of the stop seat 510 at one end of the outer guide rail portion 511 away from the valve mouth portion 410 is smaller than the inner diameter of the outer guide rail portion 511.

[0083] Specifically, a first stop portion 540 is provided on the side of the outer guide rail portion 511 away from the valve mouth portion 410, and a second stop portion 550 is provided on the side of the outer guide rail portion 511 close to the valve mouth portion 410. The rotor assembly 100 can drive the guide rod 530 to push the stop ring 520 to move spirally along the outer guide rail portion 511.

[0084] In this way, the stop ring 520 is advantageously sleeved on the stop seat 510 and located at the end of the outer guide rail portion 511 away from the valve mouth portion 410 , and is threadedly connected to the outer guide rail portion 511 .

[0085] But not limited to this, in other embodiments, the outer guide rail portion further includes a spiral guide rail (not shown) sleeved on the outside of the stop seat 510, the spiral guide rail extends in a spiral shape, and the stop ring 520 moves spirally along the extension direction of the spiral guide rail.

[0086] Furthermore, in one embodiment, the stop seat 510 is further provided with a second stop portion 550 . When the stop ring 520 stops at the second stop portion 550 , the valve core assembly 300 abuts against the valve port 410 and closes the valve port 410 .

[0087] The provision of the first stopper 540 and the second stopper 550 effectively limits the travel of the stop ring 520 on the outer guide rail 511, thereby limiting the angular range of rotation of the guide rod 530 relative to the stop seat 510. Since the guide rod 530 is fixedly connected to the rotor assembly 100 or the screw rod 200, this arrangement effectively limits the angular range of rotation of the rotor assembly 100, thereby controlling the travel of the valve core assembly 300 relative to the valve port 410 and preventing wear on the valve core assembly 300 and the valve port 410. Furthermore, this arrangement prevents the stop ring 520 from moving outside the outer guide rail 511, thereby affecting the threaded fit between the stop ring 520 and the stop seat 510.

[0088] It should be noted that the electronic expansion valve further includes a housing 800 , which covers the outside of the rotor assembly 100 , a portion of the lead screw 200 and a portion of the valve core assembly 300 and is welded to the valve seat assembly 400 .

[0089] In one embodiment, the first stopping portion 540 and the stopping seat 510 are designed to be separate, and the first stopping portion 540 and the stopping seat 510 are fixedly connected.

[0090] Furthermore, in one embodiment, one end of the first stop portion 540 is connected to the stop seat 510, and the other end protrudes from the outer side surface of the stop seat 510 along the radial direction of the stop seat 510, and the stop ring 520 can abut against the end of the first stop portion 540 protruding from the outer side surface of the stop seat 510.

[0091] Such a configuration reduces the difficulty of assembling the first stopper 540 and improves the assembly firmness of the first stopper 540 and the stopping seat 510 .

[0092] Furthermore, in one embodiment, the first stop portion 540 includes an annular fixing ring 541 and a stop ridge 542. The inner side of the annular fixing ring 541 is arranged around the circumference of the screw rod 200, and the outer ring of the annular fixing ring 541 is fixedly connected to the inner wall of the stop seat 510. The stop seat 510 is provided with a notch corresponding to the stop ridge 542. One end of the stop ridge 542 is connected to the outer ring of the annular fixing ring 541, and the other end passes through the notch along the radial direction of the stop seat 510 and protrudes from the outer side surface of the stop seat 510.

[0093] The stop ring 520 includes a moving ring body 521 and a stop head 522. The moving ring body 521 is sleeved on the outside of the stop seat 510 and is threadedly connected to the stop seat 510. One end of the stop head 522 is connected to the moving ring body 521, and the other end extends along the axial direction of the stop seat 510 and in a direction away from the valve mouth 410 to form a first head 523, so that the first head 523 can stop and cooperate with one end of the stop protrusion 542 protruding from the outer side surface of the stop seat 510.

[0094] In this way, when the stop ring 520 rotates along the stop seat 510, when the first head 523 abuts against one end of the stop protrusion 542 protruding from the outer side surface of the stop seat 510, the stop head 522 will be unable to continue to rotate under the stopping action of the stop protrusion 542. At this time, the rotor assembly 100 will also stop rotating.

[0095] It should be noted that, in one embodiment, the annular fixing ring 541 and the stop ridge 542 are integrally formed by injection molding.

[0096] However, the present invention is not limited thereto. In other embodiments, the first stopper 540 may be directly connected to the outer wall of the stopper seat 510. This helps simplify the structure of the first stopper 540 and reduce the processing cost of the electronic expansion valve.

[0097] It should be noted that, in one embodiment, the first stop portion 540 and the stop seat 510 are provided separately. Specifically, the first stop portion 540 can be connected to the stop seat 510 by snapping, welding, bonding or threading.

[0098] In another embodiment, the first stopping portion 540 and the stopping seat 510 are integrally formed by injection molding.

[0099] In one embodiment, the stopper 510 includes a stopper body 512 and a first connecting insert 513. The stopper body 512 is an injection-molded part, and the first connecting insert 513 is a metal part, and the first connecting insert 513 is embedded in the stopper body 512. Specifically, the first stopper 540 is a metal part and is welded to the first connecting insert 513.

[0100] When the stop seat 510 is processed, the first connecting insert 513 is first set at a specified position of the injection mold, and then liquid plastic is injected into the injection mold. After the liquid plastic cools and forms into the stop body 512, the first connecting insert 513 will also be firmly embedded in the stop body 512.

[0101] More specifically, the first connecting insert 513 and the first stopping portion 540 are made of the same metal, which is conducive to welding therebetween. For example, they can be made of copper, aluminum, iron or alloy materials, which are not listed here one by one.

[0102] In this way, the first stop part 540 is a metal part, which improves the structural strength of the first stop part 540 and prevents the first stop part 540 from breaking, and the stop body 512 is an injection-molded part, which reduces the weight of the entire stop seat 510. In addition, the first connecting insert 513 is a metal part and is embedded in the stop body 512, which is conducive to the first stop part 540 being connected to the stop body 512 through the first connecting insert 513.

[0103] However, the present invention is not limited thereto. In other embodiments, the first stop portion 540 may be snap-fitted, bonded, or threadedly connected to the first connecting insert 513 .

[0104] In another embodiment, the stopping seat 510 and the first stopping portion 540 are both metal parts, and the first stopping portion 540 is welded to the stopping seat 510 .

[0105] In another embodiment, the stopping seat 510 and the first stopping portion 540 are both injection molded parts.

[0106] In one embodiment, the stop seat 510 further includes a second connecting insert 514 , which is a metal component and is embedded in the stop body 512 . The valve seat assembly 400 is a metal component and is welded to the valve seat assembly 400 .

[0107] In this way, the connection strength between the stopper seat 510 and the valve seat assembly 400 is improved.

[0108] In one embodiment, one end of the second stopper 550 is connected to the stopper seat 510, and the other end protrudes radially from the outer surface of the stopper seat 510. One end of the stopper head 522 is connected to the movable ring body 521, and the other end extends axially along the stopper seat 510 toward the valve port 410 to form a second head portion 524. The second head portion 524 is adapted to engage with the end of the second stopper 550 protruding from the outer surface of the stopper seat 510.

[0109] In this way, when the stop ring 520 rotates along the stop seat 510, when the second head 524 abuts against one end of the second stop portion 550 protruding from the outer surface of the stop seat 510, the stop head 522 will be unable to continue to rotate under the stopping action of the second stop portion 550. At this time, the rotor assembly 100 will also stop rotating.

[0110] Specifically, in one embodiment, the stopper head 522 , the first head portion 523 , and the second head portion 524 are integrally formed, and the stopper head 522 , the first head portion 523 , and the second head portion 524 are injection-molded to form a block-shaped structure.

[0111] Furthermore, the dynamic ring body 521 , the stop head 522 , the first head 523 and the second head 524 are an integral injection-molded part.

[0112] In one embodiment, the first stopper 540 and the stopper seat 510 are integrally formed by injection molding. Specifically, the first stopper 540 is a protruding structure provided at one end of the stopper seat 510 .

[0113] In another embodiment, referring to FIG6 , the valve core assembly 300 further includes a first valve needle 321 and a second valve needle 322. The end of the screw rod 200 away from the rotor assembly 100 is threadedly engaged with the sliding fitting 310. The sliding fitting 310 and the stopper 510 are slidably engaged along the axial direction of the screw rod 200, so that the screw rod 200 can drive the sliding fitting 310 to drive the second valve needle 322 via the first valve needle 321 to open or close the valve port 410. The second valve needle 322 is provided with a regulating valve port 3221 that can communicate with the valve port 410. The flow area of ​​the regulating valve port 3221 is smaller than the flow area of ​​the valve port 410. The screw rod 200 can drive the sliding fitting 310 to drive the first valve needle 321 to flexibly engage with the regulating valve port 3221 to control the amount of liquid entering the regulating valve port 3221.

[0114] In this way, the screw rod 200 can be rotated along the preset direction first to drive the sliding fitting 310 to drive the first valve needle 321 and the second valve needle 322 to close the valve mouth 410. Then, the screw rod 200 can be rotated in the direction opposite to the preset direction to drive the sliding fitting 310 to drive the first valve needle 321 to move away from the regulating valve mouth 3221, thereby achieving fine-tuning of the liquid inlet amount at the regulating valve mouth 3221.

[0115] Furthermore, the electronic expansion valve further includes an elastic sealing ring 3241 , which is sleeved on the outside of the first valve needle 321 and sandwiched between the outer wall of the first valve needle 321 and the inner wall of the second valve needle 322 .

[0116] In this way, during the process of the first valve needle 321 and the second valve needle 322 moving together, when the second valve needle 322 drives the regulating valve port 3221 to shift, the elastic sealing ring 3241 can drive the first valve needle 321 to produce a certain swing angle relative to the regulating valve port 3221 through its own elastic deformation, thereby achieving the centering of the first valve needle 321 and the regulating valve port 3221 (that is, center alignment).

[0117] In addition, the first valve needle 321 and the screw rod 200 are coaxially arranged. Therefore, by setting the first limit member 220 and the elastic sealing ring 3241, the coaxiality of the connecting body of the screw rod 200, the sliding fitting 310 and the first valve needle 321 can be improved to prevent the screw rod 200, the sliding fitting 310 and the first valve needle 321 from being eccentric.

[0118] Furthermore, in one embodiment, the elastic sealing ring 3241 is a rubber member or a silicone member.

[0119] Furthermore, in one embodiment, the cross section of the elastic sealing ring 3241 is circular (ie, an O-ring).

[0120] Furthermore, in one embodiment, an annular assembly groove 324 is provided on the inner wall of the second valve needle 322, and the annular assembly groove 324 surrounds the inner wall of the second valve needle 322 around the axis of the regulating valve port 3221. One end of the elastic sealing ring 3241 is clamped in the annular assembly groove 324, and the other end extends out of the annular assembly groove 324 and abuts against the outer wall of the first valve needle 321.

[0121] In this way, by providing the annular assembly groove 324 , the elastic sealing ring 3241 is fixed to the second valve needle 322 and does not move with the first valve needle 321 , thereby preventing the elastic sealing ring 3241 from falling off.

[0122] Further, referring to FIG6 , in one embodiment, the second valve needle 322 includes a first core 3223 and a second core 3224. The regulating valve port 3221 is disposed on the second core 3224. The first core 3223 is connected to one end of the second core 3224 near the sliding nut 310. The first core 3223 and the second core 3224 enclose a movable chamber 3222. Furthermore, the second core 3224 defines a first passage 3225 connecting the valve port 410 and the movable chamber 3222. A second passage (not shown) is also defined on the sidewall of the second core 3224, connecting the regulating valve port 3221.

[0123] In this way, when the second valve needle 322 of the valve mouth part 410 is closed and the regulating valve port 3221 is opened, the valve mouth part 410 can be connected to the external pipeline through the regulating valve port 3221 and the second channel in sequence, and the opening of the regulating valve port 3221 can be controlled by the first valve needle 321.

[0124] Furthermore, in one embodiment, the first channel 3225 includes a connecting groove 3226 and multiple connecting holes 3227. The connecting groove 3226 is annular, and the valve port 410 sequentially connects to the active chamber 3222 through the multiple connecting holes 3227 and the connecting groove 3226. A buffer gasket 323 is provided on the inner wall of the active chamber 3222 near the regulating valve port 3221. An elastic sealing ring 3241 is positioned between the buffer gasket 323 and the second core 3224, and the buffer gasket 323 is located at the open end of the connecting groove 3226. Furthermore, the buffer gasket 323 is provided with one or more through-holes 3231 connecting the connecting groove 3226 and the active chamber 3222.

[0125] The connecting groove 3226 can effectively buffer the refrigerant passing through the through hole 3231. In addition, the connecting groove 3226 facilitates the arrangement of the through hole 3231 on the buffer gasket 323, and the through hole 3231 of the buffer gasket 323 does not need to be arranged corresponding to the connecting hole 3227.

[0126] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. An electronic expansion valve, characterized in that: It comprises a rotor assembly, a screw rod, a valve core assembly and a valve seat assembly, wherein the rotor assembly is connected to the screw rod, the screw rod is connected to the valve core assembly, and the valve core assembly can move relative to the valve seat assembly along the axial direction of the screw rod; The valve core assembly includes a sliding fitting and a valve needle assembly; The sliding fitting comprises a main body and a connecting part, wherein the main body is an injection molded part, and the connecting part is a metal part. One end of the connecting part is fixedly connected to the main body, and the other end is connected to the valve needle assembly.

2. The electronic expansion valve according to claim 1, wherein: One end of the screw rod away from the rotor assembly is threadedly engaged with the sliding fitting; the sliding fitting is threadedly connected to the screw rod through the main body.

3. The electronic expansion valve according to claim 1, wherein: The connecting portion and the main body portion are integrally injection-molded to form the sliding fitting.

4. The electronic expansion valve according to claim 1, wherein: The connecting portion is embedded in the main body, the main body is provided with a clamping groove, one end of the connecting portion is embedded in the clamping groove, and the other end extends toward the direction close to the valve needle assembly and is welded or clamped to the valve needle assembly.

5. The electronic expansion valve according to claim 4, wherein: The connecting part comprises a cylinder, and the cylinder and the screw shaft are coaxially arranged; The clamping groove comprises a first clamping groove, one end of the cylinder is arranged in the first clamping groove, and the other end extends out of the first clamping groove and is welded to the valve needle assembly.

6. The electronic expansion valve according to claim 5, wherein: A limiting block is provided at one end of the first slot away from the valve needle assembly, and a limiting slot or a limiting hole is provided on the cylinder body corresponding to the limiting block, and the limiting block is located in the limiting slot or the limiting hole.

7. The electronic expansion valve according to claim 5, wherein: The connecting portion further comprises a flange, which is fixed to one end of the cylinder away from the valve needle assembly, and one end of the flange is connected to the inner wall of the cylinder, and the other end extends along the radial direction of the cylinder toward the direction close to the axis of the cylinder; The snap-in groove also includes a second snap-in groove, which is arranged at one end of the first snap-in groove away from the valve needle assembly, and one end of the second snap-in groove is connected to the first snap-in groove, and the other end extends along the radial direction of the cylinder toward the direction close to the axis of the cylinder, and the flange is clamped in the second snap-in groove.

8. The electronic expansion valve according to claim 7, wherein: One end of the limiting protrusion is located in the first card slot, and the other end extends into the second card slot, and the end of the limiting protrusion extending into the second card slot is respectively in contact with two opposite side walls of the second card slot.

9. The electronic expansion valve according to claim 1, wherein: It includes a stop seat, and the valve seat assembly is provided with a valve mouth; one end of the screw rod away from the rotor assembly is threadedly matched with the sliding fitting, and the sliding fitting and the stop seat are matched through a limiting structure, so that the screw rod can drive the sliding fitting to drive the valve core assembly to move along the axial direction of the screw rod relative to the stop seat to open or close the valve mouth, and the limiting structure can prevent the sliding fitting from rotating around the axis of the screw rod relative to the stop seat.

10. The electronic expansion valve according to claim 9, wherein: The circumferential side of the sliding mating part is provided with a stop protrusion extending along its own radial direction, and the stop seat is provided with a guide groove extending along its own axial direction corresponding to the stop protrusion, and the end of the stop protrusion away from the sliding mating part extends into the guide groove and can be slidably matched with the guide groove along the axial direction of the stop seat, so that the sliding mating part and the stop seat are slidably matched along the axial direction of the stop seat, and the stop protrusion and the guide groove constitute the limiting structure.

11. The electronic expansion valve according to claim 1, wherein: The valve seat assembly is provided with a valve opening, one end of the screw rod is fixedly connected to the rotor assembly, and the other end is threadedly connected to the valve core assembly, and the rotor assembly can drive the valve core assembly to move toward or away from the valve opening through the screw rod; The electronic expansion valve also includes a stop seat, a stop ring and a guide rod, the stop seat is fixedly connected to the valve seat assembly, and the stop seat is arranged on the outer periphery of the screw rod, the stop seat is provided with an outer guide rail portion, the stop ring is sleeved on the outer periphery of the stop seat, and the guide rod is fixedly connected to the rotor assembly or the screw rod, so that the rotor assembly can drive the guide rod to push the stop ring to spirally move along the outer guide rail portion of the stop seat.

12. The electronic expansion valve according to claim 11, wherein: The stop seat is provided with a first stop portion, and when the stop ring stops at the first stop portion, the valve core assembly and the valve port portion are spaced apart and stop moving.

13. The electronic expansion valve according to claim 12, wherein: One end of the first stopper is connected to the stopper seat, and the other end protrudes from the outer side surface of the stopper seat along the radial direction of the stopper seat, and the stop ring can abut against the end of the first stopper protruding from the outer side surface of the stopper seat.

14. The electronic expansion valve according to claim 12, wherein: The stop seat is also provided with a second stop portion, one end of the second stop portion is connected to the stop seat, and the other end protrudes from the outer surface of the stop seat along the radial direction of the stop seat; the stop ring and one end of the second stop portion protruding from the outer surface of the stop seat are stop-matched; when the stop ring stops at the second stop portion, the valve core assembly abuts against the valve mouth portion and closes the valve mouth portion.

15. The electronic expansion valve according to claim 14, wherein: The first stop portion, the second stop portion and the stop seat are integrally formed by injection molding.

16. The electronic expansion valve according to claim 12, wherein: The stop seat includes a stop body and a first connecting insert, the stop body is an injection molded part, the first connecting insert is a metal part, and the first connecting insert is embedded in the stop body, the first stop part is a metal part, and the first stop part is welded to the first connecting insert.

17. The electronic expansion valve according to claim 9, wherein: The valve core assembly includes a first valve needle and a second valve needle. The first valve needle is fixedly connected to the sliding fitting. The screw drives the sliding fitting to drive the second valve needle to open or close the valve port through the first valve needle. The second valve needle is provided with a regulating valve port that can be connected to the valve port. The first valve needle can seal or open the regulating valve port.

18. The electronic expansion valve according to claim 1, wherein: The electronic expansion valve further comprises an elastic sealing ring, which is sleeved on the outside of the first valve needle and sandwiched between the outer wall of the first valve needle and the inner wall of the second valve needle.

19. The electronic expansion valve according to claim 18, wherein: An annular assembly groove is provided on the inner wall of the second valve needle, which surrounds the inner wall of the second valve needle around the axis of the regulating valve port. One end of the elastic sealing ring is clamped in the annular assembly groove, and the other end extends out of the annular assembly groove and abuts against the outer wall of the first valve needle.

20. The electronic expansion valve according to claim 19, wherein: The second valve needle includes a first core body and a second core body, the second valve needle is provided with a regulating valve port that can be connected to the valve port part, the regulating valve port is located in the second core body, the first core body is connected to one end of the second core body close to the sliding fitting, and the first core body and the second core body are surrounded to form an active cavity; and the second core body is provided with a first channel connecting the valve port part and the active cavity.

21. The electronic expansion valve according to claim 20, wherein: The first channel includes a connecting groove and a plurality of connecting holes, the connecting groove is annular, and the valve mouth is connected to the active cavity in sequence through the plurality of connecting holes and the connecting groove; a buffer gasket is provided on the inner wall of the active cavity on one side close to the regulating valve port, the elastic sealing ring is located between the buffer gasket and the second core, and the buffer gasket is located at the open end of the connecting groove, and the buffer gasket is provided with one or more through holes connecting the connecting groove and the active cavity.

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