Electronic expansion valve

Abstract

The electronic expansion valve comprises a valve seat assembly, a sleeve, a stator assembly, a fixing assembly and a sealing piece, a supporting face is arranged on the top of the valve seat assembly, and the sleeve is fixedly connected with the valve seat assembly; the stator assembly is sleeved on the sleeve; the fixing assembly is simultaneously connected with the stator assembly and the valve seat assembly; the fixing assembly comprises a connecting ring arranged in the axial direction of the valve, the sleeve is sleeved with the connecting ring, the two ends of the connecting ring are provided with a connecting piece and an abutting piece respectively, and the connecting piece is fixedly connected with the stator assembly. The sealing piece is located between the abutting piece and the supporting face and is pressed to deform. And the deformed sealing element blocks the gap between the pressing sheet and the supporting surface. In this way, humid air in the external environment can be prevented from entering the stator assembly through the gap between the fixing assembly and the valve seat assembly to corrode the stator assembly, and meanwhile humid air in the external environment can be prevented from entering the weld joint through the gap between the fixing assembly and the valve seat assembly. Meanwhile, the arrangement height of the sealing piece can be reduced, and therefore the overall cost of the valve seat assembly can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field related to control valves, and particularly relates to an electronic expansion valve. Background Art

[0002] The electronic expansion valve in the prior art includes a valve seat assembly, a sleeve, a coil assembly, a fixing member and a sealing member. The valve seat assembly is welded to the sleeve, and the welding part has a weld. The coil assembly is sleeved outside the sleeve. The fixing member is used to fix the coil assembly to the valve seat assembly, so the fixing member is connected to the bottom of the coil assembly and the valve seat assembly at the same time. The coil assembly made of plastic material is fixed to the fixing member by hot melting. In order to prevent humid air from entering the interior of the coil assembly and the weld, a sealing member is arranged between the fixing member and the valve seat assembly, and the sealing member blocks the gap between the fixing member and the valve seat assembly. A sealed closed loop is formed between the coil assembly, the fixing member, the sealing member, the valve seat assembly and the sleeve. External humid air cannot enter the interior of the coil through the gap between the fixing member and the valve seat assembly, and external humid air cannot enter the internal weld through the gap between the fixing member and the valve seat assembly. In addition, the sealing member can also prevent air from entering the coil assembly. When the electronic expansion valve is used in the cooling mode, there will be no or as little condensed water as possible inside the coil assembly, because condensed water will cause corrosion of the coil assembly or corrosion of the weld.

[0003] However, in the existing structure, the fixing member is a sheet-like structure, wherein the planar fixing plate is heat-melted and welded to the coil assembly, and the sealing member is sandwiched between the fixing plate and the valve seat assembly. One end of the valve seat assembly supporting the sealing member is a supporting surface, and in order to support the sealing member, the supporting surface is often set at a relatively high height, which increases the cost of the valve seat assembly.

[0004] How to set up a fixing frame structure that can reduce the cost of the valve seat assembly is a technical problem that all of the present application aims to solve. Utility Model Content

[0005] In view of this, it is necessary to provide an electronic expansion valve for solving the above technical problems.

[0006] An electronic expansion valve, the electronic expansion valve comprising:

[0007] A valve seat assembly having a support surface on the top;

[0008] A sleeve fixedly connected to the valve seat assembly;

[0009] A stator assembly is sleeved on the casing;

[0010] A fixed assembly is connected to the stator assembly and the valve seat assembly at the same time; the fixed assembly includes a connecting ring arranged along the valve axial direction, the connecting ring is sleeved on the sleeve, and the two ends of the connecting ring are respectively a connecting piece and a pressing piece, and the connecting piece is fixedly connected to the stator assembly;

[0011] A sealing member is located between the pressing piece and the supporting surface and deformed under pressure; the deformed sealing member blocks the gap between the pressing piece and the supporting surface.

[0012] It can be understood that the deformed seal is used to seal the gap between the pressure plate and the support surface, which can prevent the humid air in the external environment from entering the stator assembly through the gap between the fixed component and the valve seat assembly and causing corrosion to the stator assembly. At the same time, it can prevent the humid air in the external environment from entering the weld through the gap between the fixed component and the valve seat assembly, which has the effect of increasing the life of the electronic expansion valve; at the same time, the setting of the connecting ring can make the seal do not need to be in direct contact with the connecting plate, so the setting height of the seal can be reduced, and the valve seat assembly can reduce the height of the support surface accordingly, thereby reducing the overall cost of the valve seat assembly.

[0013] In one of the embodiments, a through hole is provided in the middle of the connecting ring, and the sleeve passes through the through hole; the connecting piece and the pressing piece are both circular ring structures extending from the connecting ring in a direction away from the valve axial direction.

[0014] It can be understood that the connecting piece and the pressing piece are arranged as a circular ring structure, which can facilitate the assembly connection between the connecting piece and the stator assembly and also facilitate the pressing of the pressing piece against the sealing member.

[0015] In one embodiment, the area of ​​the circle formed by the pressing sheet is smaller than the area of ​​the circle formed by the connecting sheet.

[0016] It can be understood that the above-mentioned structural arrangement can reduce the manufacturing cost of the fixing assembly while satisfying the requirements that the pressing plate presses against the sealing member and the connecting plate is connected to the stator assembly.

[0017] In one embodiment, the connecting piece, the pressing piece and the connecting ring are an integral structure.

[0018] In one embodiment, the pressing piece and the connecting ring are formed on the connecting piece by stamping.

[0019] It can be understood that the pressing piece and the connecting ring are formed on the connecting piece by stamping, so that the fixing component can be manufactured by stamping process, which has the effect of reducing costs.

[0020] In one of the embodiments, a chamfered section is provided at the connection between the connecting ring and the pressure plate, and the sealing member is subjected to an inclined force F under the extrusion of the chamfered section. The force F can be decomposed into F1 along the valve axial direction and away from the fixing component and F2 along the valve radial direction and pointing to the valve axis.

[0021] In one of the embodiments, the seal after extrusion and deformation is at least partially located between the fixing component and the sleeve; the seal blocks the gap between the fixing component and the sleeve.

[0022] It can be understood that, through the above-mentioned structural arrangement, the sealing performance of the sealing member during assembly can be further increased.

[0023] In one of the embodiments, the connection between the sleeve and the valve seat assembly is a weld; the seal after extrusion and deformation covers the weld, and the seal is sealed and matched with the position of the weld.

[0024] In one embodiment, a step is provided on the top of the valve seat assembly, and the step includes a first surface parallel to the valve radial direction and a second surface parallel to the valve axial direction; after extrusion and deformation, the seal blocks the gap between the pressure plate and the first surface; after extrusion and deformation, the seal is at least partially located between the second surface and the fixed assembly; and the seal simultaneously blocks the gap between the second surface and the fixed assembly.

[0025] In one embodiment, the valve seat assembly includes a mounting body and a valve core seat, the mounting body has a mounting cavity, and at least a portion of the valve core seat is located in the mounting cavity;

[0026] The fixing assembly further comprises a connecting plate connected to the connecting piece or the pressing piece, and the connecting plate is fixedly connected to the mounting body.

[0027] It can be understood that, through the above-mentioned structural setting, the assembly connection between the fixing component and the valve seat component is specifically realized.

[0028] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0029] The electronic expansion valve for which protection is sought in the present application uses a deformed seal to block the gap between the pressure plate and the support surface, thereby isolating humid air in the external environment from entering the stator assembly through the gap between the fixed assembly and the valve seat assembly and causing corrosion to the stator assembly, isolating air in the external environment from entering the stator assembly and generating condensed water, and isolating humid air in the external environment from entering the weld through the gap between the fixed assembly and the valve seat assembly, thereby increasing the service life of the electronic expansion valve; at the same time, the provision of the connecting ring allows the seal to be free of direct contact with the connecting plate, thereby reducing the setting height of the seal, and the valve seat assembly can reduce the height of the support surface accordingly, thereby reducing the overall cost of the valve seat assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the structure of an electronic expansion valve provided in one embodiment of the present application;

[0032] Figure 2 A schematic structural diagram of an electronic expansion valve provided in an embodiment of the present application from another perspective;

[0033] Figure 3 A cross-sectional view of an electronic expansion valve provided in one embodiment of the present application, wherein the sealing member is configured as a sealing ring;

[0034] Figure 4 for Figure 3 Enlarged view of the middle P part;

[0035] Figure 5 A cross-sectional view of an electronic expansion valve provided in one embodiment of the present application, wherein the sealing member is configured as a sealing gasket;

[0036] Figure 6 A schematic diagram of the structure of a fixed card provided in an embodiment of the present application;

[0037] Figure 7 A cross-sectional view of a fixed card provided in accordance with an embodiment of the present application.

[0038] : Illustration numerals: 100, electronic expansion valve; 10, valve seat assembly; 101, first surface; 102, second surface; 110, support surface; 11, valve port; 12, mounting body; 121, mounting cavity; 13, valve core seat; 21, rotor assembly; 22, sleeve; 23, stator assembly; 30, fixing assembly; 31, connecting plate; 310, chamfered section; 311, pressure plate; 312, connecting ring; 3121, through hole; 32, connecting plate; 321, connecting piece; 40, sealing piece; 410, sealing ring; 420, sealing gasket; 50, valve core assembly. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] It should be noted that when an element is referred to as being "provided on" another element, it may be directly provided on the other element or there may be a central element. When an element is considered to be "provided on" another element, it may be directly provided on the other element or there may be a central element at the same time. When an element is considered to be "fixed to" another element, it may be directly fixed to the other element or there may be a central element at the same time.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] like Figures 1 to 4 As shown, an electronic expansion valve 100 provided in an embodiment of the present application includes a valve seat assembly 10, a sleeve 22, a stator assembly 23, a fixing assembly 30 and a sealing member 40. A supporting surface 110 is provided on the top of the valve seat assembly 10, and the sleeve 22 is fixedly connected to the valve seat assembly 10; the stator assembly 23 is sleeved on the sleeve 22; the fixing assembly 30 is connected to the stator assembly 23 and the valve seat assembly 10 at the same time; the fixing assembly 30 includes a connecting ring 312 arranged along the valve axial direction, the connecting ring 312 is cylindrical, and the connecting ring 312 is sleeved on the sleeve 22, and the two ends of the connecting ring 312 are respectively fixedly connected to the connecting piece 31 and the pressing piece 311, and the connecting piece 31 is fixedly connected to the stator assembly 23; the sealing member 40 is located between the pressing piece 311 and the supporting surface 110 and is deformed under pressure; the deformed sealing member 40 blocks the gap between the pressing piece 311 and the supporting surface 110. Here, a valve port 11 is formed on the valve seat assembly 10, a sleeve 22 is arranged between the rotor assembly 21 and the stator assembly 23 of the electronic expansion valve 100 and welded to the valve seat assembly 10, the connection between the sleeve 22 and the valve seat assembly 10 is a weld, the stator assembly 23 is an injection molded part that encapsulates the enameled wire inside, and has a socket connected to an external power supply, and the connecting piece 31 and the bottom of the stator assembly 23 are fixed by hot melt. In addition, after the stator assembly 23 is powered on, the rotor assembly 21 can control the lifting and lowering of the valve core assembly 50 under the drive of the stator assembly 23, so as to control the on / off of the valve port 11 and control the opening / closing of the electronic expansion valve 100. The stator assembly 23 is connected to the fixing assembly 30, and the fixing assembly 30 is connected to the valve seat assembly 10.

[0043] It can be understood that the deformed sealing member 40 is used to seal the gap between the pressure plate 311 and the support surface 110, so that the humid air in the external environment can be prevented from entering the stator assembly 23 through the gap between the fixed assembly 30 and the valve seat assembly 10 to cause corrosion to the stator assembly 23, and the air in the external environment can be prevented from entering the stator assembly to produce condensed water. At the same time, the humid air in the external environment is prevented from entering the weld through the gap between the fixed assembly 30 and the valve seat assembly 10, which has the effect of increasing the life of the electronic expansion valve; at the same time, the setting of the connecting ring 312 can make the sealing member 40 do not need to be in direct contact with the connecting plate 31, so that the setting height of the sealing member 40 can be reduced, and the valve seat assembly 10 can reduce the height of the support surface 110 accordingly, thereby reducing the overall cost of the valve seat assembly 10.

[0044] The seal 40 is configured as Figure 4 The sealing ring 410 shown or Figure 5 Gasket 420 is shown.

[0045] like Figure 6 , Figure 7 As shown, in order to facilitate the processing of the fixed component 30, the connecting ring 312, the connecting piece 31 and the pressing piece 311 are an integrated structure, which can be formed by a stamping process. The unstamped fixed component is a circular flat plate without a hole, which is formed into the connecting ring 312, the connecting piece 31 and the pressing piece 311 at one time after stamping. After stamping, the middle of the connecting ring 312 is a through hole 3121 for the sleeve to pass through, and the through hole 3121 is an inner flange hole formed by stamping. The connecting piece 31 and the pressing piece 311 are both circular ring structures extending from the connecting ring 312 away from the axial direction of the valve, and the connecting piece 31 of the circular ring structure is convenient for hot-melt fixing with the bottom of the stator assembly 23. The pressing piece 311 of the circular ring structure is convenient for extruding the sealing member 40. In the prior art, the middle hole of the fixed member is also made by a stamping process, and the material dropped by the stamping is discarded. In this embodiment, the discarded material is stamped into the connecting ring 312 and the pressing piece 311. Therefore, the cost of the fixing components does not increase compared to the prior art.

[0046] The annular pressing piece 311 is only used for pressing the seal 40, and has a small use area. The annular connecting piece 31 is used for connecting with the bottom of the stator assembly 23, and has a large use area. During manufacturing, in order to save costs, the annular surface of the pressing piece 311 is smaller than the annular area of ​​the connecting piece 31.

[0047] The top of the valve seat assembly 10 is provided with a step, which includes a first surface 101 parallel to the valve radial direction and a second surface 102 parallel to the valve axial direction. The seal 40 after extrusion and deformation blocks the gap between the pressing plate 311 and the first surface 101. The welding joint between the sleeve 22 and the second surface 102 forms a weld. The connection between the connecting ring 312 and the pressing plate 311 has a chamfered section 310, which squeezes the seal 40, so that the seal 40 is subjected to a force F in an inclined direction, and F can be decomposed into F1 along the valve axial direction and away from the fixing assembly 30 and F2 along the valve radial direction and pointing to the valve axis.

[0048] In one embodiment, F1 squeezes the seal 40, and the seal 40 blocks the gap between the pressing piece 311 and the first surface 101. F2 squeezes the seal 40, and the squeezed and deformed seal 40 is at least partially located between the second surface 102 and the fixed assembly 30, and the seal 40 simultaneously blocks the gap between the second surface 102 and the fixed assembly 30. On the basis of the sealing between the pressing piece 311 and the first surface 101, the sealing of the internal space of the stator assembly 23 is further increased.

[0049] In another embodiment, F1 extrude the seal 40, and the seal 40 blocks the gap between the pressing piece 311 and the first surface 101. F2 extrude the seal 40, and the seal 40 after extrusion and deformation is at least partially located between the fixed assembly 30 and the sleeve 22, and the seal 40 blocks the gap between the fixed assembly 30 and the sleeve 22. The sealing of the internal space of the stator assembly 23 is further increased on the basis of the sealing between the pressing piece 311 and the first surface 101. In addition, the weld is isolated from the external humid air by the seal to prevent the weld from being corroded by the humid air.

[0050] In other embodiments, F1 squeezes the seal 40, and the seal 40 blocks the gap between the pressing piece 311 and the first surface 101. A portion of the projection of the seal 40 along the axial direction of the valve is located within the height range of the axis where the sleeve 22 is located, and another portion is located within the height range of the axis where the second surface 102 is located. F2 squeezes the seal 40, and the squeezed and deformed seal 40 covers the weld, and the seal 40 is sealed with the weld. On the basis of sealing between the pressing piece 311 and the first surface 101, the weld is further prevented from being corroded by humid air.

[0051] like Figure 2 , Figure 6 , Figure 7As shown, in one embodiment, in order to facilitate the connection of the fixing assembly 30 with the valve seat assembly 10, the fixing assembly 30 further includes a connecting plate 32 connected to the connecting sheet 31 or to the pressing sheet 311. The valve seat assembly 10 includes a mounting body 12 and a valve core seat 13, the mounting body 12 has a mounting cavity 121 inside, at least part of the valve core seat 13 is fixed in the mounting cavity 121, and the connecting plate 32 is abutted against the outer wall of the mounting body 12 and connected to the mounting body 12. Here, the connecting plate 32 is fixed to the mounting body 12 by a connecting piece 321 that penetrates the connecting plate 32 and is threadedly connected to the mounting body 12.

[0052] In addition, the seal 40 not only improves the sealing performance, but also has a shock absorbing function, specifically, it can reduce the vibration noise generated by the electronic expansion valve 100 during operation.

[0053] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above 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.

[0054] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection required by the present invention.

Claims

1. An electronic expansion valve, characterized in that: The electronic expansion valve (100) comprises: A valve seat assembly (10) having a support surface (110) on the top; A sleeve (22) fixedly connected to the valve seat assembly (10); A stator assembly (23) is sleeved on the sleeve (22); A fixing assembly (30) is connected to the stator assembly (23) and the valve seat assembly (10) at the same time; the fixing assembly (30) comprises a connecting ring (312) arranged along the valve axial direction, the connecting ring (312) is sleeved on the sleeve (22), two ends of the connecting ring (312) are respectively fixedly connected to a connecting piece (31) and a pressing piece (311), and the connecting piece (31) is fixedly connected to the stator assembly (23); The sealing member (40) is located between the pressing piece (311) and the supporting surface (110) and is deformed under pressure; the deformed sealing member (40) blocks the gap between the pressing piece (311) and the supporting surface (110).

2. The electronic expansion valve according to claim 1, characterized in that: A through hole (3121) is provided in the middle of the connecting ring (312), and the sleeve (22) passes through the through hole (3121); the connecting piece (31) and the pressing piece (311) are both circular ring structures extending from the connecting ring (312) in a direction away from the valve axial direction.

3. The electronic expansion valve according to claim 2, characterized in that: The area of ​​the circular ring formed by the pressing piece (311) is smaller than the area of ​​the circular ring formed by the connecting piece (31).

4. The electronic expansion valve according to claim 1, characterized in that: The connecting piece (31), the pressing piece (311) and the connecting ring (312) are an integrated structure.

5. The electronic expansion valve according to claim 1 or 4, characterized in that: The pressing piece (311) and the connecting ring (312) are formed on the connecting piece (31) by stamping.

6. The electronic expansion valve according to claim 1, characterized in that: A chamfered section (310) is provided at the connection between the connecting ring (312) and the pressing plate (311), and the sealing member (40) is subjected to a force F in an inclined direction under the compression of the chamfered section (310). The force F can be decomposed into F1 along the valve axial direction and away from the fixing component (30) and F2 along the valve radial direction and pointing to the valve axis.

7. The electronic expansion valve according to claim 1, characterized in that: After being squeezed and deformed, the sealing member (40) is at least partially located between the fixing assembly (30) and the sleeve (22); the sealing member (40) blocks the gap between the fixing assembly (30) and the sleeve (22).

8. The electronic expansion valve according to claim 1, characterized in that: The connection between the sleeve (22) and the valve seat assembly (10) is a weld; the seal (40) after extrusion deformation covers the weld, and the seal (40) is sealed and matched with the position of the weld.

9. The electronic expansion valve according to claim 1, characterized in that: The top of the valve seat assembly (10) is provided with a step, and the step includes a first surface (101) parallel to the valve radial direction and a second surface (102) parallel to the valve axial direction; after being extruded and deformed, the sealing member (40) blocks the gap between the pressing plate (311) and the first surface (101); after being extruded and deformed, the sealing member (40) is at least partially located between the second surface (102) and the fixed assembly (30); and the sealing member (40) simultaneously blocks the gap between the second surface (102) and the fixed assembly (30).

10. The electronic expansion valve according to claim 1, characterized in that: The valve seat assembly (10) comprises a mounting body (12) and a valve core seat (13); the mounting body (12) has a mounting cavity (121) therein, and at least a portion of the valve core seat (13) is located in the mounting cavity (121); The fixing assembly (30) further comprises a connecting plate (32) connected to the connecting plate (31) or connected to the pressing plate (311), and the connecting plate (32) is fixedly connected to the mounting body (12).

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