CN219954265U - Valve assembly and electronic expansion valve - Google Patents

Abstract

The utility model provides a valve assembly and an electronic expansion valve, wherein the valve assembly comprises a valve seat assembly, a valve needle assembly and a sealing structure; in the scheme, the sealing structure comprises the sealing ring and the sealing ring, the bulge part of the sealing ring is in guiding sealing fit with the outer wall of the valve needle assembly or the inner wall of the valve seat assembly, and the sealing ring applies elastic pretightening force to the sealing ring, compared with the single O-shaped ring, the interaction force between the sealing ring and the valve needle assembly or the interaction force between the sealing ring and the valve seat assembly are large, the sealing effect is good, and leakage of a sealing position in a high-temperature environment or after long-term use can be avoided through the elastic pretightening force, so that the reliability of long-term use is ensured; moreover, the cylindrical matching surface on the protruding part is in sealing fit with the valve needle assembly or the valve seat assembly in the scheme, so that the valve needle assembly can be guided. In addition, the scheme also avoids overlarge switching valve resistance caused by overlarge contact area between the sealing ring and the valve needle assembly or the valve seat assembly, and ensures smooth switching valve of the valve assembly.

Description

Valve assembly and electronic expansion valve

Technical Field

The utility model relates to the technical field of valve assemblies, in particular to a valve assembly and an electronic expansion valve.

Background

In valve assemblies, the valve needle assembly is movably disposed within the valve seat assembly to open and close the valve orifice, and a single O-ring or a single sealing ring is typically provided to seal the mating locations of the valve needle assembly and the valve seat assembly for sealing purposes. However, for the use environment of high-pressure fluid such as carbon dioxide, a single O-ring is easily damaged, so that the tightness and reliability of the valve assembly are poor; the single sealing ring is made of PTFE, interference with the valve seat assembly is reduced after high-temperature deformation, and leakage is easy to occur.

Disclosure of Invention

The utility model provides a valve assembly and an electronic expansion valve, which are used for improving the sealing effect and reliability of the valve assembly.

To achieve the above object, according to one aspect of the present utility model, there is provided a valve assembly comprising: a valve seat assembly having a valve port; a valve needle assembly movably disposed within the valve seat assembly to open and close the valve port; the sealing structure comprises a sealing ring and a sealing ring, wherein the sealing ring is provided with a protruding part, and the protruding part is provided with a cylindrical matching surface; the valve needle assembly penetrates through the sealing ring, and the matching surface is in guiding sealing fit with the outer wall of the valve needle assembly; or the sealing structure is limited in the valve needle assembly, the sealing ring is arranged around the sealing ring, and the matching surface is in guiding sealing fit with the inner wall of the valve seat assembly.

Further, the protruding part is provided with a first conical surface, and one end of the first conical surface with a small diameter is connected with one end of the matching surface; or the protruding part is provided with a first annular cambered surface, and one end of the first cambered surface with a small diameter is connected with one end of the matching surface.

Further, the protruding part is provided with a second conical surface, and one end of the second conical surface with a small diameter is connected with the other end of the matching surface; or the protruding part is provided with a ring-shaped second cambered surface, and one end of the second cambered surface with a small diameter is connected with the other end of the matching surface.

Further, the sealing ring is made of polytetrafluoroethylene, and the sealing ring is an O-shaped ring.

Further, the valve seat assembly has an annular groove, and the sealing structure is located in the annular groove.

Further, the valve seat assembly includes a first portion and a second portion fixedly connected, the annular recess being located between the first portion and the second portion, the second portion having the valve port.

Further, the first portion includes valve gap and annular baffle, the valve gap has first interior annular step, annular baffle is fixed in the annular step in the first, annular groove is located annular baffle with between the second portion, annular baffle with seal structure spacing cooperation, the valve needle subassembly passes annular baffle, valve gap with second portion fixed connection.

Further, the second portion includes lag and valve core seat, the lag has the second inner ring shape step, the annular groove is located the second inner ring shape step with between the first portion, the lag with first portion fixed connection, the valve core seat with lag fixed connection, the valve core seat has the valve port, the lateral wall of valve core seat has the circulation hole, under the condition that the valve port is opened with the circulation hole intercommunication.

Or the first part is provided with a third annular step and a fourth annular step which are arranged in a stepped manner, the third annular step is close to the valve port relative to the fourth annular step, the second part stretches into the third annular step and is fixedly connected with the third annular step, and the annular groove is positioned between the end face of the second part and the fourth annular step.

According to another aspect of the present utility model, there is provided an electronic expansion valve comprising a mounting seat and the valve assembly described above, a portion of the valve seat assembly of the valve assembly extending into and fixedly connected to the mounting seat.

By applying the technical scheme of the utility model, the valve assembly comprises a valve seat assembly, a valve needle assembly and a sealing structure, wherein the valve seat assembly is provided with a valve port; the valve needle assembly is movably arranged in the valve seat assembly to open and close the valve opening; the sealing structure comprises a sealing ring and a sealing ring, wherein the sealing ring is provided with a bulge part, and the bulge part is provided with a cylindrical matching surface; the valve needle assembly penetrates through the sealing ring, and the matching surface is in guiding sealing fit with the outer wall of the valve needle assembly; or the sealing structure is limited in the valve needle assembly, the sealing ring is arranged around the sealing ring, and the matching surface is in guiding sealing fit with the inner wall of the valve seat assembly. In the scheme, the sealing structure comprises the sealing ring and the sealing ring, the bulge part of the sealing ring is in guiding sealing fit with the outer wall of the valve needle assembly or the inner wall of the valve seat assembly, and the sealing ring applies elastic pretightening force to the sealing ring, compared with the single O-shaped ring and the single sealing ring, the interaction force between the sealing ring and the valve needle assembly or the valve seat assembly is larger, the sealing effect is good, the leakage of the sealing position in a high-temperature environment or after long-term use can be avoided through the elastic pretightening force, and the reliability of long-term use is ensured; moreover, the cylindrical matching surface on the protruding part is in sealing fit with the valve needle assembly or the valve seat assembly in the scheme, so that the valve needle assembly can be guided. In addition, in this scheme the axial dimension of mating surface is less than the whole axial dimension of sealing ring, has also avoided the sealing ring too big and the ooff valve resistance that leads to of needle subassembly or disk seat subassembly area of contact too much, has guaranteed the smooth and easy ooff valve of valve subassembly.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 shows a schematic structural view of a valve assembly provided in accordance with a first embodiment of the present utility model;

FIG. 2 shows a partial enlarged view of FIG. 1;

FIG. 3 is a schematic view showing a structure of a valve assembly according to a second embodiment of the present utility model;

fig. 4 shows a schematic structural view of a valve assembly according to a third embodiment of the present utility model.

Wherein the above figures include the following reference numerals:

100. a valve seat assembly; 101. a valve port; 102. a flow hole; 103. an annular groove; 104. a guide sleeve; 110. a valve core seat; 120. a protective sleeve; 127. a second inner annular step; 130. a valve cover; 131. a third annular step; 132. a first inner annular step; 133. a fourth annular step; 140. an annular baffle;

200. a valve needle assembly;

300. a sealing structure; 310. a seal ring; 320. a seal ring; 321. a boss; 322. a mating surface; 323. a first conical surface; 324. a second conical surface;

400. a screw assembly; 420. a screw; 430. a bearing; 440. assembling a set; 450. a bushing; 460. a spring;

710. and (5) a mounting seat.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 4, an embodiment of the present utility model provides a valve assembly including: a valve seat assembly 100, the valve seat assembly 100 having a valve port 101; a needle assembly 200 movably disposed within the valve seat assembly 100 to open and close the valve port 101; a seal structure 300, the seal structure 300 comprising a seal ring 310 and a seal ring 320, the seal ring 320 having a boss 321, the boss 321 having a cylindrical mating surface 322; wherein, the sealing structure 300 is limited in the valve seat assembly 100, the sealing ring 310 is arranged around the sealing ring 320, the valve needle assembly 200 passes through the sealing ring 320, and the matching surface 322 is in guiding sealing fit with the outer wall of the valve needle assembly 200; or seal structure 300 is retained within valve needle assembly 200, and sealing ring 320 is disposed around sealing ring 310 with mating surface 322 in guided sealing engagement with the inner wall of valve seat assembly 100.

In the scheme, the sealing structure 300 comprises the sealing ring 310 and the sealing ring 320, the protruding part 321 of the sealing ring 320 is in guiding sealing fit with the outer wall of the valve needle assembly 200 or the inner wall of the valve seat assembly 100, and the sealing ring 310 applies elastic pre-tightening force to the sealing ring 320, compared with the single O-shaped ring, the interaction force between the sealing ring 320 and the valve needle assembly 200 or the valve seat assembly 100 is larger, the sealing effect is good, leakage of a sealing position in a high-temperature environment or after long-term use can be avoided through the elastic pre-tightening force, and the reliability of long-term use is ensured; moreover, the cylindrical mating surface 322 on the boss 321 in this embodiment is in sealing engagement with the valve needle assembly 200 or the valve seat assembly 100, which also serves as a guide for the valve needle assembly 200. In addition, in this embodiment, the axial dimension of the mating surface 322 is smaller than the overall axial dimension of the sealing ring 320, so that excessive valve opening and closing resistance caused by excessive contact area between the sealing ring 320 and the valve needle assembly 200 or the valve seat assembly 100 is avoided, and smooth valve opening and closing of the valve assembly is ensured.

As shown in fig. 2, the protruding portion 321 has a first tapered surface 323, and an end of the first tapered surface 323 having a smaller diameter is connected to an end of the mating surface 322; or the protruding portion 321 has a first arc surface in a ring shape, and an end of the first arc surface having a small diameter is connected to an end of the mating surface 322. By providing the first taper 323 or the first arc surface, a guiding function can be performed at the time of assembly, and the axial dimension of the mating surface 322 is reduced.

The protruding portion 321 further has a second conical surface 324, and one end of the second conical surface 324 with a smaller diameter is connected with the other end of the mating surface 322; or the protruding portion 321 has a second arc surface in a ring shape, and one end of the second arc surface having a small diameter is connected to the other end of the mating surface 322. By providing the second tapered surface 324 or the second cambered surface, guiding effect can be achieved at the time of assembly, and the axial dimension of the mating surface 322 can be reduced.

The sealing ring 320 is made of polytetrafluoroethylene, so that the sealing ring has relatively high bearing capacity and is suitable for a high-pressure working environment. The sealing ring 310 is an O-ring, so that the elastic force is large, and an elastic pretightening force can be applied to the sealing ring 320. Through the scheme, the interaction force between the sealing ring 320 and the valve needle assembly 200 or the valve seat assembly 100 is large, the sealing effect is good, leakage of the sealing position in a high-temperature environment or after long-term use can be avoided through elastic pretightening force, and the reliability of long-term use is ensured.

Wherein the valve seat assembly 100 has an annular groove 103, and the sealing structure 300 is positioned in the annular groove 103, so that the limit of the sealing structure 300 is realized.

Specifically, the valve seat assembly 100 includes a first portion and a second portion fixedly coupled, with an annular recess 103 located therebetween, the second portion having a valve port 101. The valve seat assembly 100 is arranged into a split structure, so that the annular groove 103 is formed conveniently, and the processing difficulty is reduced.

Specifically, the first portion includes a valve cap 130 and an annular baffle 140, the valve cap 130 has a first inner annular step 132, the annular baffle 140 is fixed in the first inner annular step 132, the annular groove 103 is located between the annular baffle 140 and the second portion, the annular baffle 140 and the sealing structure 300 are in limit fit, the valve needle assembly 200 passes through the annular baffle 140, and the valve cap 130 and the second portion are fixedly connected. The annular baffle 140 is fixed in the first inner annular step 132, so that axial limiting of the annular baffle 140 and the annular baffle is realized, the sealing structure 300 can be axially limited through the annular baffle 140, and the sealing structure 300 is prevented from being separated from the annular groove 103.

As shown in fig. 1, the second portion includes a protective sleeve 120 and a valve core seat 110, the protective sleeve 120 has a second inner annular step 127, the annular groove 103 is located between the second inner annular step 127 and the first portion, the protective sleeve 120 is fixedly connected with the first portion, the valve core seat 110 is fixedly connected with the protective sleeve 120, the valve core seat 110 has a valve port 101, a side wall of the valve core seat 110 has a flow hole 102, and the valve port 101 is communicated with the flow hole 102 when being opened. Accurate positioning and reliable connection of the protective sleeve 120 and the valve core seat 110 are achieved by the second inner annular step 127. The second part is arranged into a split structure, so that the processing difficulty can be reduced.

In another embodiment, as shown in fig. 3, the first portion has a third annular step 131 and a fourth annular step 133 in a stepped arrangement, the third annular step 131 being adjacent to the valve port 101 relative to the fourth annular step 133, the second portion extending into the third annular step 131 and being fixedly connected to the third annular step 131, and the annular recess 103 being located between an end face of the second portion and the fourth annular step 133. This arrangement also enables reliable connection of the first and second portions and limiting of the seal 300.

The valve assembly further includes a screw assembly 400, the screw assembly 400 being coupled to one end of the needle assembly 200 to drive the needle assembly 200 back and forth, the valve seat assembly 100 having a guide sleeve 104, the screw assembly 400 passing through the guide sleeve 104. Wherein, screw rod subassembly 400 includes screw rod 420, bearing 430, assembly cover 440, bush 450 and spring 460, and bearing 430, bush 450 and spring 460 all are located assembly cover 440, and bush 450 and bearing 430 butt, spring 460 cover is on bush 450 and with needle subassembly 200 butt, assembly cover 440 and needle subassembly 200 fixed connection. The bushing 450 may be configured in a closed configuration that shields the bearing 430 from fluids and contaminants entering the bearing that may affect the life of the bearing 430.

As shown in fig. 4, the present embodiment further provides an electronic expansion valve, which includes a mounting seat 710 and the valve assembly described above, and a portion of the valve seat assembly 100 of the valve assembly extends into the mounting seat 710 and is fixedly connected to the mounting seat 710. The electronic expansion valve is suitable for use environments such as vehicles and the like.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

Claims (10)

1. A valve assembly, comprising:

a valve seat assembly (100), the valve seat assembly (100) having a valve port (101);

a needle assembly (200) movably disposed within the valve seat assembly (100) to open and close the valve port (101);

a sealing structure (300), the sealing structure (300) comprising a sealing ring (310) and a sealing ring (320), the sealing ring (320) having a protrusion (321), the protrusion (321) having a cylindrical mating surface (322);

wherein the sealing structure (300) is limited in the valve seat assembly (100), the sealing ring (310) is arranged around the sealing ring (320), the valve needle assembly (200) passes through the sealing ring (320), and the matching surface (322) is in guiding sealing fit with the outer wall of the valve needle assembly (200); or the sealing structure (300) is limited in the valve needle assembly (200), the sealing ring (320) is arranged around the sealing ring (310), and the matching surface (322) is in guiding sealing fit with the inner wall of the valve seat assembly (100).

2. The valve assembly according to claim 1, wherein the boss (321) has a first conical surface (323), the end of the first conical surface (323) having a smaller diameter being connected to the end of the mating surface (322); or the protruding part (321) is provided with a first annular cambered surface, and one end of the first cambered surface with a small diameter is connected with one end of the matching surface (322).

3. The valve assembly according to claim 2, wherein the boss (321) has a second tapered surface (324), the smaller diameter end of the second tapered surface (324) being connected to the other end of the mating surface (322); or the protruding part (321) is provided with a second annular cambered surface, and one end of the second cambered surface with a small diameter is connected with the other end of the matching surface (322).

4. The valve assembly of claim 1, wherein the sealing ring (320) is made of polytetrafluoroethylene, and the sealing ring (310) is an O-ring.

5. The valve assembly of claim 1, wherein the valve seat assembly (100) has an annular groove (103), the sealing structure (300) being located within the annular groove (103).

6. The valve assembly of claim 5, wherein the valve seat assembly (100) comprises a first portion and a second portion, the first portion and the second portion being fixedly connected, the annular groove (103) being located between the first portion and the second portion, the second portion having the valve port (101).

7. The valve assembly of claim 6, wherein the first portion comprises a valve cover (130) and an annular barrier (140), the valve cover (130) having a first inner annular step (132), the annular barrier (140) being secured within the first inner annular step (132), the annular groove (103) being located between the annular barrier (140) and the second portion, the annular barrier (140) and the sealing structure (300) being in a positive fit, the valve needle assembly (200) passing through the annular barrier (140), the valve cover (130) and the second portion being fixedly connected.

8. The valve assembly of claim 6, wherein the second portion includes a boot (120) and a cartridge seat (110), the boot (120) having a second inner annular step (127), the annular groove (103) being located between the second inner annular step (127) and the first portion, the boot (120) and the first portion being fixedly connected, the cartridge seat (110) and the boot (120) being fixedly connected, the cartridge seat (110) having the valve port (101), a sidewall of the cartridge seat (110) having a flow-through hole (102), the valve port (101) being in open communication with the flow-through hole (102).

9. The valve assembly of claim 6, wherein the first portion has a third annular step (131) and a fourth annular step (133) in a stepped arrangement, the third annular step (131) being adjacent the valve port (101) relative to the fourth annular step (133), the second portion extending into the third annular step (131) and being fixedly connected to the third annular step (131), the annular groove (103) being located between an end face of the second portion and the fourth annular step (133).

10. An electronic expansion valve, characterized in that it comprises a mounting seat (710) and a valve assembly according to any of claims 1 to 9, a portion of the valve seat assembly (100) of the valve assembly extending into the mounting seat (710) and being fixedly connected to the mounting seat (710).