CN214743648U

CN214743648U - Reversing valve

Info

Publication number: CN214743648U
Application number: CN202120979239.3U
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Climate and Appliance Controls Group Co Ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2021-01-04
Filing date: 2021-05-10
Publication date: 2021-11-16
Anticipated expiration: 2031-05-10

Abstract

The utility model discloses a reversing valve, including valve body, case subassembly, first end cover, the valve body is the tube-shape and still includes the locating part, the locating part with valve body welded fastening, and/or the locating part with first end cover welded fastening, the locating part includes spacing portion, the case subassembly includes first piston body, the case subassembly can follow in the valve body the axial displacement of valve body, first piston body can with spacing portion butt, first piston body with during spacing portion butt, first piston body with first end cover contactless can avoid first piston body and first end cover to take place to interfere.

Description

Reversing valve

Technical Field

The utility model relates to a fluid control technical field, concretely relates to reversing valve.

Background

The reversing valve is used as an important component in an air conditioner and a heat pump system and is used for realizing the conversion between a refrigeration mode and a heating mode.

Fig. 1 is a schematic structural diagram of a reversing valve in the background art, and as shown in fig. 1, the reversing valve includes a pilot valve 01 and a main valve 02, and the main valve 02 includes a slider 03, a connecting rod 04, a piston 05, and an end cap 06. Piston body 05 includes screw 07, and screw 07 is connected with connecting rod 04 and piston body 05 fixed.

When the reversing valve works, the piston body 05 moves back and forth between the two end covers 06, and the end covers 06 limit the piston 05.

As shown in fig. 1, the screw 07 on the piston body 05 should not contact the end cap 06 to avoid interference. Particularly, as the overall size of the main valve of the direction valve is smaller, the possibility that the screw 07 interferes with the end cap 06 is higher, thereby affecting the operational reliability of the direction valve.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a reversing valve, including valve body, case subassembly, first end cover, the valve body is the tube-shape, still includes the locating part, the locating part with valve body welded fastening, and/or the locating part with first end cover welded fastening, the locating part includes spacing portion, the case subassembly includes first piston body, the case subassembly can follow in the valve body the axial displacement of valve body, first piston body can with spacing portion butt, first piston body with during spacing portion butt, first piston body with first end cover contactless.

According to the reversing valve, the limiting piece is arranged to limit the movement of the first piston body in the valve body towards the first end cover, and the first piston body can be prevented from interfering with the first end cover.

Drawings

FIG. 1 is a schematic structural diagram of a reversing valve in the prior art;

FIG. 2 is a schematic structural view of an embodiment of a diverter valve of the present application;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 3a is an enlarged view of a portion of FIG. 3 at I;

FIG. 4 is a perspective view of the limiting member of FIG. 2;

FIG. 5 is a perspective view of the first end cap of FIG. 2;

FIG. 6 is a perspective view of a first end cap of yet another embodiment.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Fig. 2 is a schematic structural diagram of an embodiment of the applied reversing valve. It should be noted that fig. 2 illustrates a four-way reversing valve as an example, but the drawings are not intended to limit the technical solution of the present application, and the technical solution of the present application may also be applied to a reversing valve with three-way or more than five-way.

As shown in fig. 2 and 3, the reversing valve includes a cylindrical valve body 1, a second end cap 21 and a stopper 22 are fixed to one end of the valve body 1, and a first end cap 23 and a stopper 24 are fixed to the other end of the valve body 1. The valve body 1, the second end cover 21 and the first end cover 23 are fixed to form a valve cavity of the reversing valve.

The spool assembly 3 is disposed in the valve cavity, and the spool assembly 3 includes a sliding block 31, a connecting rod 32, a second piston body 33 and a first piston body 34.

The sliding block 31 is fixedly connected with the connecting rod 32, the second piston body 33 and the first piston body 34 are respectively located at two ends of the connecting rod 32, the sliding block 31 is located between the second piston body 33 and the first piston body 34, and the spool assembly 3 can move towards the first end cover 21 in the axial direction of the valve body 1 relative to the valve body 1 under the action of pressure difference at two sides of the spool assembly 3. The operating position of the reversing valve when the first piston body 34 abuts against the limiting member 24 for limiting in fig. 2 is defined as a first operating position, and the operating position of the reversing valve when the second piston body 33 abuts against the limiting member 22 for limiting is defined as a second operating position.

The valve seat 4 of the reversing valve comprises E, S, C openings arranged at intervals, when the reversing valve is in a first working position, the S opening and the C opening are communicated with the slide block cavity of the slide block 31, and when the reversing valve is in a second working position, the S opening and the E opening are communicated with the slide block cavity of the slide block 31.

As shown in fig. 3 and 4, the valve body 1, the first end cap, and the position limiting member are made of stainless steel, and the three components may be welded and fixed at one time or may be welded and fixed two by two. The stopper 24 and the stopper 22 have a circular cylindrical shape, and the stopper 24 will be described in detail as an example. The fixing portion 241 of the limiting member 24 is located between the inner wall of the valve body 1 and the outer wall of the first end cover 23, and the limiting member 24 is welded and fixed to the valve body 1 and the first end cover 23, specifically, the limiting member 24 may be welded and fixed to the valve body 1 or the first end cover 23 by laser welding, and then welded and fixed to the other of the valve body 1 and the first end cover 23 by laser welding, or the limiting member 24 may be welded and fixed to the valve body 1 and the first end cover 23 by laser welding once.

The stopper portion 242 of the stopper 24 is adjacent to the first piston body 34. Specifically, during the movement of the spool assembly 4 relative to the valve body 1, the first piston body 34 can abut against and limit the position of the position-limiting portion 242 of the position-limiting member 24. Especially when the diameter of the valve body 1 is smaller, the action of the limiting piece 24 is more obvious, and when the diameter size of the valve body is miniaturized, the reversing valve has better reliability than that of the reversing valve in the background technology.

As shown in fig. 3, the first piston body 34 includes a sliding bowl 341 made of a non-metallic material, a stopper 342 made of a metallic material, and two or more screws 343, and the screws 343 fixedly connect the sliding bowl 341, the stopper 342, and the connecting rod 32. The stopper 32 can abut against the stopper portion 242 of the stopper 24 to restrict further axial displacement of the first piston body 34 toward the first end cover 23.

As shown in fig. 3, in the reversing valve of the above-mentioned embodiment, by providing the stopper 24, the stopper portion 242 of the stopper 24 is located between the first end cap 23 and the first piston body 34, and the first piston body 34 can abut against the stopper portion 242 of the stopper 24, so that the displacement of the first piston body 34 is restricted, and it is effectively ensured that the first piston body 34 and the first end cap 23 do not contact with each other and do not interfere with each other.

As shown in fig. 3 and 3a, the limiting member 24 is cylindrical and is located between the first end cap 23 and the first piston body 34, please refer to fig. 1 and 2, the reversing valve of the present application is connected to a pilot valve (as shown by reference numeral 01 in fig. 1) of the reversing valve through the first capillary 7 and/or the second capillary 8, for this purpose, the valve body 1 further includes a first capillary interface a and a second capillary interface b, the first capillary 7 is connected to the first capillary interface a, and the second capillary 8 is connected to the second capillary interface b. The first capillary 7 and the second capillary 8 are welded and fixed with the valve body 1. The first capillary interface a is located between the first piston body 34 and the first end cap 23 and the second capillary interface b is located between the second piston body 33 and the second end cap 21.

A first pressure chamber P1 is comprised between the first piston body 34 and the first end cap 23, and a second pressure chamber P2 is comprised between the second piston body 33 and the second end cap 21. The first pressure chamber P1 communicates with the first capillary 7 through a first capillary interface a, and the second pressure chamber P2 communicates with the second capillary 8 through a second capillary interface b. In order not to interfere the communication between the first pressure chamber P1 and the first capillary tube 7, a communication passage 243 is opened in the side wall of the stopper 24, and the communication passage 243 communicates the first pressure chamber P1 with the port 71 of the first capillary tube 7. Further, on a plane passing through the end surface of the slider 31 (in the drawing, the end surface of the slider 31 is the lower end surface of the slider 31), the projection of the communication passage 243 covers the projection of the first capillary 7. That is, when the communication passage 243 is a through hole, the hole wall of the through hole cannot block the fluid injected from the first capillary 7 into the first pressure chamber P1, so that the flow performance of the fluid is not affected.

It should also be noted that the communication channel 243 may be a circular hole as shown in fig. 4, or may be a rectangular or other irregular hole.

Further, the first end cap 23 and the second end cap 21 may be the structures shown in fig. 3 and 6. Taking one of the end caps as an example, the first end cap 23 includes an annular engaging portion 231 engaged with the limiting member 24, and the engaging portion 231 is located in the limiting member 24 and is welded and fixed after being in interference fit with the limiting member 24. The retaining member 24 further includes a circular cap portion 232 located within the retaining member 24, the cap portion 232 having a diameter smaller than the diameter of the mating portion 231. In the axial direction of the stopper 24, the top cover portion 232 is closer to the first piston body 34 than the fitting portion 231, so that when the first piston body 34 abuts against the stopper portion 242, a predetermined distance is provided between the screw 343 and the top cover portion 232 in the axial direction of the valve body 1; or when the first piston body abuts against the stopper 242, the screw 343 is at least partially positioned in the circumferential direction of the top cover 232.

Again, the end cap may be the structure shown in fig. 6. The first end cap 23A includes an annular engaging portion 231A for engaging with the limiting member 24, the engaging portion 231A is the same as the engaging portion 231 in fig. 5, and the first end cap 23A is different from the end cap shown in fig. 5 in that the first end cap 23A includes a flat portion 234A. When the first piston body abuts against the stopper 242, a predetermined distance is provided between the screw 343 and the flat surface 234A in the axial direction of the valve body 1. This first end cap 23A is easier to machine, saves material, and is relatively lighter in weight than the first end cap 23 of fig. 5. Moreover, the end cover with the structure is beneficial to reducing the axial size of the reversing valve.

The second piston body 33 and the first piston body 34 may have the same or different structures, and similarly, the second end cap 21 and the first end cap 23 may have the same or different structures. And are not intended to be limiting herein. As a specific example, in the reversing valve shown in fig. 2, the second piston body 33 has the same structure as the first piston body 34, and the second end cap 21 has the same structure as the first end cap 23.

The foregoing is merely a description of specific embodiments of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The reversing valve is characterized by further comprising a limiting part, wherein the limiting part is fixedly welded with the valve body, and/or the limiting part is fixedly welded with the first end cover, the limiting part comprises a limiting part, the valve core component comprises a first piston body, the valve core component can axially move in the valve body along the valve body, the first piston body can be abutted against the limiting part, and when the first piston body is abutted against the limiting part, the first piston body is not in contact with the first end cover.

2. The reversing valve according to claim 1, further comprising a first capillary tube, wherein the first capillary tube is welded to the valve body, a first pressure chamber is disposed between the first piston body and the first end cap, the valve body comprises a first capillary tube interface, the first capillary tube is communicated with the first capillary tube interface, the retaining member comprises a communication channel, and the first capillary tube, the communication channel and the first pressure chamber are communicated with each other.

3. The reversing valve according to claim 2, wherein a projection of the communication passage on a plane passing through the slider end face covers a projection of the first capillary.

4. The reversing valve according to any one of claims 1 to 3, wherein the retaining member comprises a fixing portion between the inner wall of the valve body and the outer wall of the first end cap, the fixing portion is welded to the valve body, and the fixing portion is welded to the first end cap.

5. The reversing valve according to claim 4, wherein the first end cap includes a fitting portion and a top cap portion, the fitting portion is annular, the first end cap is fixed to the retainer by welding via the fitting portion, the top cap portion is circular, the top cap portion has a diameter smaller than that of the fitting portion, and the top cap portion is closer to the first piston body than the fitting portion in the axial direction of the retainer.

6. The reversing valve according to claim 5, wherein the spool assembly further comprises a connecting rod and a sliding block, the first piston body and the first end cover are located on the same side of the sliding block, the sliding block is fixedly or limitedly connected with the connecting rod, the first piston body comprises a sliding bowl, a blocking piece and more than two screws, and the sliding bowl, the blocking piece and the connecting rod are fixedly connected through the screws; when the first piston body is abutted against the limiting part, a preset distance is reserved between the screw and the top cover part in the axial direction of the valve body; or when the first piston body is abutted against the limiting part, at least part of the screw is positioned in the circumferential direction of the top cover part.

7. The reversing valve according to claim 4, wherein the first end cap includes a fitting portion and a flat portion, the fitting portion is annular, the fitting portion is located in the retaining member, and the first end cap is fixed to the retaining member by welding via the fitting portion.

8. The reversing valve according to claim 7, wherein the spool assembly further comprises a connecting rod and a sliding block, the first piston body and the first end cover are located on the same side of the sliding block, the sliding block is fixedly or limitedly connected with the connecting rod, the first piston body comprises a sliding bowl, a blocking piece and more than two screws, and the sliding bowl, the blocking piece and the connecting rod are fixedly connected through the screws; when the first piston body is abutted against the limiting part, a preset distance is reserved between the screw and the plane part in the axial direction of the valve body.

9. The reversing valve according to claim 4, wherein the valve body is made of stainless steel, the first end cap is made of stainless steel, the limiting member and the valve body are welded and fixed by laser welding, and the limiting member and the first end cap are welded and fixed by laser welding.