CN210600285U - Reversing valve and refrigeration system using same - Google Patents

Abstract

The utility model discloses a reversing valve, its case part includes the link, first seal part, second seal part, the case, first seal part includes first sealing member, first base, set up the first support piece between first sealing member and first base, first base is made by metal material, first support piece is made by non-metallic material, first sealing member includes first bottom and first cyclic annular portion, first bottom and the laminating of first support piece, the periphery wall of first cyclic annular portion and the laminating of the inner wall of valve body, the circumference outer fringe of first base roughly isThe first support member has a substantially circular peripheral edge defining a diameter d of the first base₁A diameter d defining a circumferential outer edge of the first support member₁' when the diameter of the inner wall of the valve body is defined as D, D₁<d₁’<D, this scheme can improve the sealing reliability between the inner wall of first seal part and valve body, the utility model also discloses an use refrigerating system of this switching-over valve.

Description

Reversing valve and refrigeration system using same

Technical Field

The utility model relates to a fluid control technical field, concretely relates to switching-over valve and use refrigerating system of this switching-over valve.

Background

The reversing valve is widely used as a common control part in a flow path system, and is used in a refrigeration system such as an air conditioner and the like to switch the flowing direction of a refrigeration medium, so that the heat pump type air conditioner is switched between two working states of refrigeration and heating, and the purpose of dual purposes of refrigeration in summer and heating in winter is realized.

Fig. 1 is a schematic cross-sectional view of a reversing valve in the prior art, and fig. 2 is a schematic cross-sectional view of a sealing member of the reversing valve in fig. 1.

Referring to fig. 1 and 2, the reversing valve in the background art includes a valve body 107, a valve seat 101 is welded inside the valve body 107, and the valve seat 101 has three ports: an S port communicating with the compressor suction port, an E port communicating with the indoor heat exchanger, and a C port communicating with the outdoor heat exchanger. Two piston parts 105 and connecting rod 106 fixed connection in the valve body 107, and two piston parts 105 divide into three chambeies about the inner chamber of valve body 107, and valve body 107 is provided with the D mouth that communicates lumen and compressor exhaust port end intercommunication, and slider 102 sets up in the lumen and is connected with connecting rod 106, and under the drive of connecting rod 106, slider 102 can slide for the surface of valve seat 101.

As shown in fig. 2, the piston member 105 of the reversing valve of fig. 1 includes a stainless steel spacer 105A, a piston bowl 105B made of plastic, a spring plate 105C and a pressing plate 105D, and the spacer 105A, the piston bowl 105B, the spring plate 105C and the pressing plate 105D are integrally fixed. The piston bowl 105B includes an engaging portion 1051B engaging with the gasket 105A, and a ring portion 1052B extending in the axial direction of the valve body substantially along the engaging portion 1051B.

In the above background art, since the gasket 105A and the valve body 107 are made of metal, a large design gap must be ensured between the two to avoid or reduce friction between the two, but since the piston bowl 105B made of plastic material may be softened due to the temperature during use, the strength of the piston bowl 105B may be sharply reduced along with the increase of temperature, and under the action of fluid pressure differential force, the ring portion 1052B of the piston bowl 105B, which is engaged with the valve body, may extrude and creep to the large gap between the piston gasket 105A and the valve body, thereby possibly affecting the sealing performance between the piston bowl 105B and the valve body 107 of the reversing valve.

SUMMERY OF THE UTILITY MODEL

To solve the above technical problems, the utility model discloses aThe reversing valve comprises a valve body component, a valve core component and a valve seat component, wherein the valve body component comprises a valve body, the valve body is roughly cylindrical, the valve seat component comprises a valve seat, the valve seat is fixedly connected with the valve body, the valve seat at least comprises a first valve port and a second valve port, the valve core component comprises a connecting frame, a first sealing component, a second sealing component and a valve core, the first sealing component is fixedly connected with the connecting frame, the second sealing component is fixedly connected with the connecting frame, the valve core is arranged between the first sealing component and the second sealing component, the valve core is in limit connection with the connecting frame, the connecting frame can drive the valve core to slide relative to the valve seat, the valve body comprises a fluid inlet, and when the valve core is located at a first position, the fluid inlet is communicated with the first valve port, when the valve core is located at the second position, the fluid inlet is communicated with the second valve port, the first sealing part comprises a first sealing element, a first base and a first supporting piece arranged between the first sealing element and the first base, the first base is made of a metal material, the first supporting piece is made of a non-metal material, the first base, the first sealing element and the first supporting piece are fixedly connected, the first sealing element comprises a first bottom and a first annular part, the first bottom is attached to the first supporting piece, the outer peripheral wall of the first annular part is attached to the inner wall of the valve body, the outer peripheral edge of the first base is approximately circular, the outer peripheral edge of the first supporting piece is approximately circular, and the diameter of the outer peripheral edge of the first base is defined as d₁Defining a diameter d of a circumferential outer edge of the first support member₁', the diameter of the inner wall of the valve body is defined as D, then D₁<d₁’<D。

The utility model provides a reversing valve, first support piece are made by non-metallic material, and first sealing member includes first bottom and first cyclic annular portion, and first bottom and the laminating of first support piece, the periphery wall of first cyclic annular portion and the inner wall laminating of valve body, the circumference outer fringe of first base roughly are circularly, and the circumference outer fringe of first support piece roughly is circularly, and first support piece's circumference outer fringe roughly is circularlyThe diameter of the circumferential outer edge of the base is d₁The diameter of the peripheral outer edge of the first support is d₁' if the diameter of the inner wall of the valve body is D, D is satisfied₁<d₁’<D, the sealing reliability between the first seal member and the inner wall of the valve body can thus be improved.

Furthermore, the utility model also discloses an use the utility model discloses the refrigerating system of switching-over valve, including compressor, first heat exchanger, second heat exchanger, the switching-over valve the disk seat still includes the third valve port, fluid inlet with the exit end intercommunication of compressor, first valve port with first heat exchanger's import intercommunication, the second valve port with second heat exchanger's export intercommunication, the third valve port with the entrance point intercommunication of compressor. As the reversing valve with the technical effect is used in the refrigerating system, the refrigerating medium of the refrigerating system can adopt CO₂Or R32 and the like which have higher requirements on the high temperature resistance and the pressure resistance of the reversing valve and are beneficial to environmental protection.

Drawings

FIG. 1: the cross-sectional structure schematic diagram of a specific structure of a reversing valve in the background art;

FIG. 2: FIG. 1 is a schematic diagram of a transverse cross-sectional structure of a piston body of the reversing valve;

FIG. 3: the utility model provides a section schematic diagram of a specific embodiment of a reversing valve;

FIG. 4: FIG. 3 is a schematic view of the first seal member in engagement with the valve body;

FIG. 5: FIG. 3 is a schematic view of a second seal member engaged with a valve body;

FIG. 6: the utility model provides a refrigerating system's schematic diagram.

Detailed Description

The core of the present invention is to provide a direction-changing valve and a refrigeration system using the direction-changing valve, wherein the upper, lower, left, right and other directional terms used herein are defined based on the position shown in the drawings, and it should be understood that the directional terms used herein are intended to help illustrate the technical solutions herein, and should not limit the protection scope of the patent.

In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.

Fig. 3 is a schematic cross-sectional view of a specific embodiment of the reversing valve according to the present invention, fig. 4 is a schematic view of the first sealing member and the valve body in fig. 3, and fig. 5 is a schematic view of the second sealing member and the valve body in fig. 3.

Please refer to fig. 3. The direction valve of this embodiment includes a valve body member 10, a valve core member 20, and a valve seat member 30, the valve body member 10 includes a valve body 11, and the valve body 11 is substantially cylindrical. The valve seat member 30 includes a valve seat 31, and the valve seat 31 is disposed in the inner cavity of the valve body 11 and welded and fixed to the inner wall of the valve body 11. The valve seat 31 includes a first port 32, a second port 33, and a third port 34. The first port 32 communicates with a first connection pipe 35 welded to the valve seat 31, the second port 33 communicates with a second connection pipe 36 welded to the valve seat 31, and the third port 34 communicates with a third connection pipe 37 welded to the valve seat 31.

The valve core component 20 comprises a connecting frame 21, a valve core 22, a first sealing component 23 fixedly connected with one end of the connecting frame 21 and a second sealing component 24 fixedly connected with the other end of the connecting frame 21, the valve core 22 is arranged on the connecting frame 21 and positioned between the first sealing component 23 and the second sealing component 24, and the valve core 22 is in limit connection with the connecting frame 21, wherein the limit connection is used for enabling the connecting frame 21 to drive the valve core 22 to slide relative to the valve seat 21, so that as long as the function can be realized, the valve core 22 and the connecting frame 21 can be fixedly connected into a whole or in a non-fixed connection. The valve body 11 includes a fluid inlet 111 between the first and second seal members 23, 24, the fluid inlet 111 being operable to communicate with the outlet end of a compressor in a refrigeration system to allow high pressure fluid to enter the valve chamber of the reversing valve. The first sealing member 23 includes a first sealing member 231, a first base 232, and a first supporting member 233 disposed between the first sealing member 231 and the first base 232, the first base 232 is made of a metal material, the first supporting member 233 is made of a non-metal material, and the first sealing member 231, the first base 232, and the first supporting member 233 are fixedly connected. First, theThe sealing member 231 includes a first bottom portion 2311 and a first side wall portion 2312, the first side wall portion 2312 includes a first annular portion 2313 and a first transition portion 2310 connecting the first annular portion 2313 and the first bottom portion 2311, the first transition portion 2310 is substantially radial, and a diameter of a circumferential outer edge of the first support 233 is larger than a diameter of a circumferential outer edge of the first bottom portion 2311. The first bottom 2311 is attached to the first support member 233, the outer peripheral wall of the first annular portion 2313 is attached to the inner wall of the valve body 11, the circumferential outer edge of the first base 232 is substantially circular, the circumferential outer edge of the first support member 233 is substantially circular, and the diameter d of the circumferential outer edge of the first base 232 is defined₁A diameter d defining a circumferential outer edge of the first support member 233₁' when the diameter of the inner wall of the valve body 11 is defined as D, D₁<d₁’<D。

When the spool 22 slides to a first position (the position shown in fig. 3) relative to the valve seat 31 with the action of the carrier 21, the fluid inlet 111 communicates with the first port 32, the second port 33 communicates with the third port 34, and the second port 33 and the third port 34 do not communicate with the fluid inlet 111. When the spool 22 slides to a second position (not shown) relative to the valve seat 31, the fluid inlet 111 communicates with the second port 33, the first port 32 communicates with the third port 34, and the first port 32 and the third port 34 do not communicate with the fluid inlet 111.

The reversing valve of the scheme is characterized in that a first supporting piece 233 made of a non-metal material is arranged between a first sealing piece 231 and a first base 232, and the circumferential outer edge diameter d of the first base 232₁Diameter d of the circumferential outer edge of the first support 233₁' and the inner wall diameter D of the valve body 11 satisfies D₁<d₁’<D. Thus, by disposing the first supporter 233 made of a non-metallic material between the first sealing member 231 and the first base 232, d₁<d₁’<D, the gap between the outer edge of the first supporter 233 made of a non-metallic material and the inner wall of the valve body 11 is smaller than the gap between the outer edge of the first base 232 and the inner wall of the valve body 11, and the first supporter 233 is disposed to limit friction between the first base 232 made of a metallic material and the valve body 11 during operation of the reversing valve, because the first supporter 232 is disposed to limit friction between the first base 232 and the valve body 11233 are made of a non-metal material, for example, a polymer material such as teflon or polyphenylene sulfide, and a single-side gap between the circumferential outer edge of the first support member 233 and the inner wall of the valve body 11 can be set to be small. In the operation process of the reversing valve, even if friction occurs between the first support member 233 and the inner wall of the valve body 11, the quality of the inner wall of the valve body 11 is not significantly affected, and the sealing performance between the first sealing member 231 and the inner wall of the valve body 11 is facilitated.

Moreover, when the first side wall 2312 of the first sealing member 231 is subjected to creep deformation towards the first supporting member 233 under the action of the high-temperature and high-pressure fluid, the first supporting member 233 supports the first sealing member 231, and the creep deformation of the first side wall 2312 of the first sealing member 231 towards the gap between the first base 232 and the valve body 11 is limited, so that the technical problems in the background art are solved, the sealing performance between the first sealing member 231 and the inner wall of the valve body 11 is improved, and the reversing valve in the scheme can meet the operating requirements of working conditions with higher temperature and higher pressure compared with the reversing valve in the background art. In addition, the first support 233 limits the creep deformation of the first side wall portion 2312 of the first sealing member 231 to the gap between the first base 232 and the valve body 11, so that the hidden danger of dead locking of the reversing valve caused by the fact that the side wall portion 2312 turns outwards to enter the gap between the first base 232 and the valve body 11 can be avoided, and the action reliability of the reversing valve is improved.

With the improvement of global environmental protection consciousness, the requirement of the refrigeration system for environmental protection of the refrigerant is higher and higher, and markets such as europe and the like have started to adopt new refrigerants such as CO2, R32 and the like which are more environment-friendly. However, these new refrigerants have the characteristics of high exhaust temperature, high exhaust pressure and the like, and it is imperative that components in the system, such as the reversing valve, can adapt to the changes of the conditions of the system, such as pressure, temperature and the like. For example, the R32 refrigerant currently has market requirements for high temperature resistance of 160 ℃ or higher and a design pressure of 4.9 MPa. This places higher performance requirements on the design of the components inside the reversing valve. The reversing valve of this scheme can adapt to above-mentioned high performance requirement through above-mentioned structural design.

In a further aspect, the circumferential outer edge diameter d of the first support 233₁' and the diameter D of the inner wall of the valve body satisfies that D-D is more than or equal to 0.2mm₁' < 0.5 mm. With this arrangement, the first support 233 can restrict creep deformation of the side wall portion 2312 of the first seal 231 toward the gap between the first base 232 and the valve body 11, and at the same time, can reduce friction between the first support 233 and the inner wall of the valve body 11, thereby reducing or even avoiding the influence of the arrangement of the first support 233 on the flexibility of the valve core member 20. Moreover, the first supporting member 232 is substantially flat, and the first supporting member 232 may be made of a teflon material having the same material as the first sealing member 231, so that it is not necessary to separately search for other materials and process. At this time, the thickness t of the first support member₁≥1.5(D-d₁) The reason is that σ is D-D for convenience of explanation₁Then from a shear strength perspective, this time can be calculated

P is the pressure difference across the first sealing member 23. Since the design once determined, D/D₁The ratio of the diameters of the valve body 11 and the first base 232 is shown as a constant value; sigma/t₁Representing the aspect ratio of the sheared part of the piston, assuming σ/t₁With a stress of S for a ratio of 1, it is expected that a stress of 2/3 times or less S will be more reliable for the reinforcing gasket, and therefore t is required₁1.5 σ or more, i.e., t₁≥1.5(D-d₁). In this way, creep deformation of the circumferential outer edge of the first support 233 to the gap between the first base 232 and the inner wall of the valve body 11 can be restricted.

In addition, when the first sealing member 231 is made of PTFE and the first supporting member 233 is made of PPS, D-D is not less than 0.2mm₁' < 0.5mm, the first support member 233 has a substantially flat plate shape, and the first support member 233 has a thickness t₁Satisfy (D-D)₁)≤t₁<1.5(D-d₁). That is, when the first support 233 is made of polyphenylene sulfide, which is a material having a hardness greater than that of polytetrafluoroethylene, the thickness of the first support 233 may be madeAnd is reduced accordingly.

The fixed connection among the first sealing member 231, the first base 232 and the first support 233 can be flexibly designed. As shown in fig. 3, the first sealing member 23 further includes a pressing piece 234 made of metal and a spring piece 235. The pressing piece 234 presses the bottom 2311 of the first seal 231 and the spring piece 235. The first base 232 includes a first through hole 237, the first support 233 includes a second through hole 238, the first sealing member 231 includes a third through hole 239, and the pressing piece 234 includes a fourth through hole 240. The rivet 250 fixedly connects the first base 232, the first support 233, the first sealing member 231, and the pressing piece 234 through the respective through holes.

As a specific example, in this embodiment, the second sealing member 24 has the same structure as the first sealing member, and specifically includes a second sealing member 231A, a second base 232A, and a second support 233A disposed between the second sealing member 231A and the second base 232A, where the second base 232A is made of a metal material and the second support 233A is made of a non-metal material. The second sealing member 231A, the second base 232A and the second support 233A are fixedly coupled in a manner that can be understood with reference to the first sealing member 23 and will not be described again.

The second sealing member 231A includes a second bottom portion 2311A attached to the second support member 233A, and further includes a second side wall portion 2312A, the second side wall portion 2312A includes a second annular portion 2313A and a second transition portion 2310A connecting the second annular portion 2313A and the second bottom portion 2311A, the second transition portion 2310A is substantially radial, and a diameter of a circumferential outer edge of the second support member 233A is larger than a diameter of a circumferential outer edge of the second bottom portion 2311A. The second bottom 2311A is attached to the second support member 233A, the outer peripheral wall of the second annular portion 2313A is attached to the inner wall of the valve body 11, the circumferential outer edge of the second base 232A is substantially circular, the circumferential outer edge of the second support member 233A is substantially circular, and the diameter d of the circumferential outer edge of the second base 232A is substantially equal to the diameter d of the second base 232A₂Diameter d of the circumferential outer edge of the second support member 233A₂' and the diameter D of the inner wall of the valve body 11 satisfies D₂<d₂’<D. The second support member 233A is substantially flat and defines a thickness t of the second support member₂Then t is₂≥1.5(D-d₂). By passingThe first sealing member 23 and the second sealing member 24 are provided, so that the high temperature resistance and high pressure resistance of the reversing valve can be better improved. For example, it can be better applied to CO₂And R32, etc.

In a further embodiment, the second support member 233A is made of teflon, the second sealing member 231A is made of teflon, and the circumferential outer diameter d of the second support member 233A₂' and the diameter D of the inner wall of the valve body satisfies that D-D is more than or equal to 0.2mm₂' < 0.5 mm. The second supporting member 233A has a substantially flat plate shape, and the thickness t of the second supporting member 233A₂≥1.5(D-d₂). The reason and effect thereof will be described with reference to the description of the structure of the first seal member, and will not be repeated here.

When the second supporter 233A is made of a polyphenylene sulfide material and the second seal 231A is made of a polytetrafluoroethylene material, as with the first seal member, the diameter d of the circumferential outer edge of the second supporter 233A₂' the diameter D of the inner wall of the valve body 11 satisfies 0.2 mm. ltoreq. D-D₂' < 0.5 mm. The second supporting member 233A is substantially in the shape of a flat plate, and the thickness t of the second supporting member 233A₂Satisfy (D-D)₂)≤t₂<1.5(D-d₂). The reason and effect thereof will be described with reference to the description of the structure of the first seal member, and will not be repeated here.

Fig. 6 is a schematic diagram of a refrigeration system according to the present invention. As shown in fig. 6 and with reference to fig. 3, the refrigeration system includes the reversing valve 1 of the present application, the first heat exchanger 2, the second heat exchanger 3, the compressor 4 and the throttling element 5, the fluid inlet 111 of the reversing valve 1 is communicated with the outlet end of the compressor 4, the first valve port 32 is communicated with the inlet of the first heat exchanger 2, the second valve port 33 is communicated with the outlet of the second heat exchanger 3, and the third valve port 34 is communicated with the inlet end of the compressor 4. In the refrigeration system, the reversing valve is used, so that the refrigeration system can use CO₂Or R32, which is more environmentally friendly than conventional refrigerants.

The reversing valve and the refrigeration system using the reversing valve provided by the utility model are described in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (13)

1. A reversing valve comprises a valve body component, a valve core component and a valve seat component, wherein the valve body component comprises a valve body, the valve body is roughly cylindrical, the valve seat component comprises a valve seat, the valve seat is fixedly connected with the valve body, the valve seat at least comprises a first valve port and a second valve port, the valve core component comprises a connecting frame, a first sealing component, a second sealing component and a valve core, the first sealing component is fixedly connected with the connecting frame, the second sealing component is fixedly connected with the connecting frame, the valve core is arranged between the first sealing component and the second sealing component, the valve core is in limit connection with the connecting frame, the connecting frame can drive the valve core to slide relative to the valve seat, the valve body comprises a fluid inlet, and when the valve core is located at a first position, the fluid inlet is communicated with the first valve port, when the valve spool is in the second position, the fluid inlet is in communication with the second valve port,

the first sealing part comprises a first sealing element, a first base and a first supporting piece arranged between the first sealing element and the first base, the first base is made of a metal material, the first supporting piece is made of a non-metal material, the first base is fixedly connected with the first sealing element, the first sealing element comprises a first bottom and a first annular part, the first bottom is attached to the first supporting piece, the outer peripheral wall of the first annular part is attached to the inner wall of the valve body, the circumferential outer edge of the first base is approximately circular, the circumferential outer edge of the first supporting piece is approximately circular, and the first base is definedHas a diameter d of the circumferential outer edge₁Defining a diameter d of a circumferential outer edge of the first support member₁', the diameter of the inner wall of the valve body is defined as D, then D₁<d₁’<D。

2. The reversing valve of claim 1, wherein 0.2mm ≦ D-D₁' < 0.5mm, the first support member is substantially flat plate-shaped, and the thickness of the first support member is defined as t₁Then t is₁≥1.5(D-d₁)。

3. The reversing valve of claim 2, wherein the first support member is made of a polytetrafluoroethylene material and the first seal member is made of a polytetrafluoroethylene material.

4. The reversing valve of claim 1, wherein 0.2mm ≦ D-D₁' < 0.5mm, the first support member is substantially flat plate-shaped, and the thickness of the first support member is defined as t₁Then D-D₁≤t₁<1.5(D-d₁)。

5. The reversing valve of claim 4, wherein the first support is made of a polyphenylene sulfide material and the first seal is made of a polytetrafluoroethylene material.

6. The reversing valve of any of claims 1-5, wherein the first seal includes a first sidewall portion including the first annular portion and a first transition portion connecting the first annular portion and the first base portion, the first transition portion being generally radial, and a circumferential outer edge of the first support having a diameter greater than a circumferential outer edge of the first base portion.

7. The reversing valve of any of claims 1-5, wherein the second sealing member comprises a second seal, a second seatThe second sealing piece is fixedly connected with the second supporting piece, the second sealing piece comprises a second bottom and a second annular part, the second bottom is attached to the second supporting piece, the outer peripheral wall of the second annular part is attached to the inner wall of the valve body, the outer peripheral edge of the second base is approximately circular, the outer peripheral edge of the second supporting piece is approximately circular, and the diameter of the outer peripheral edge of the second base is defined as d₂A diameter defining a circumferential outer edge of the second support member as d₂', the diameter of the inner wall of the valve body is defined as D, then D₂<d₂’<D。

8. The reversing valve of claim 7, wherein 0.2mm ≦ D-D₂' ≦ 0.5mm, the second support member being substantially flat and defining a thickness t of the second support member₂Then t is₂≥1.5(D-d₂)。

9. The reversing valve of claim 8, wherein the second support is made of a polytetrafluoroethylene material and the second seal is made of a polytetrafluoroethylene material.

10. The reversing valve of claim 7, wherein 0.2mm ≦ D-D₂' ≦ 0.5mm, the second support member being substantially flat and defining a thickness t of the second support member₂Then D-D₂≤t₂<1.5(D-d₂)。

11. The reversing valve of claim 10, wherein the second support is made of a polyphenylene sulfide material and the second seal is made of a polytetrafluoroethylene material.

12. The reversing valve of claim 7, wherein the second seal includes a second sidewall portion including the second annular portion and a second transition portion connecting the second annular portion and the second base portion, the second transition portion being generally radial, a diameter of a circumferential outer edge of the second support being greater than a diameter of a circumferential outer edge of the second base portion.

13. A refrigeration system comprising a compressor, a first heat exchanger, a second heat exchanger, and a reversing valve according to any one of claims 1-12, wherein the valve seat further comprises a third port, the fluid inlet being in communication with an outlet port of the compressor, the first port being in communication with an inlet port of the first heat exchanger, the second port being in communication with an outlet port of the second heat exchanger, and the third port being in communication with an inlet port of the compressor.

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