CN218582331U - Switching valve - Google Patents

Abstract

The application relates to the technical field of refrigeration, in particular to a switching valve. The switching valve includes: the valve body is provided with a first end cover and a valve cavity; the valve seat assembly is positioned in the valve cavity and connected with the valve body; the sliding block assembly is positioned in the valve cavity, and two ends of the sliding block assembly are respectively abutted against two opposite inner walls of the valve seat assembly and can slide on the valve seat assembly along the axial direction of the valve body; the switching valve also comprises a low-pressure pipe, a first connecting pipe, a second connecting pipe and a high-pressure pipe, wherein the low-pressure pipe, the first connecting pipe and the second connecting pipe are all arranged on the valve seat assembly in a penetrating mode, and the first connecting pipe, the second connecting pipe and the low-pressure pipe are located in the opposite direction of the valve body; the high-pressure pipe is arranged on the first end cover. The application has the advantages that: the distance between the connecting pipes can be greatly reduced, so that the length and the weight of the valve body are reduced.

Description

Switching valve

Technical Field

The application relates to the technical field of refrigeration, in particular to a switching valve.

Background

The switching valve is arranged in the air conditioning unit and used for controlling the communication or the separation of the pipelines, thereby realizing the diversion circulation of the refrigerant.

The existing switching valve comprises a four-way valve, and the four-way valve comprises a valve body, a valve seat and a sliding block. The valve body is provided with a valve cavity; the valve seat is positioned in the valve cavity and connected with the valve body. The slider is abutted against the valve seat and can slide along the surface of the valve seat. The four-way valve further comprises a first connecting pipe, a low-pressure pipe and a second connecting pipe, wherein the first connecting pipe, the low-pressure pipe and the second connecting pipe are located on the same side of the valve body and are sequentially arranged. Because a gap needs to be reserved between the adjacent connecting pipes for welding the connecting pipes and the valve body, the whole length of the valve body is long, and the weight of the valve body is heavy.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a switching valve that can be reduced in weight.

A switching valve, comprising: the valve body is provided with a first end cover and a valve cavity; the valve seat assembly is positioned in the valve cavity and is connected with the valve body; the sliding block assembly is positioned in the valve cavity, two ends of the sliding block assembly are respectively abutted against two opposite inner walls of the valve seat assembly, and the sliding block assembly can slide on the valve seat assembly along the axial direction of the valve body; the switching valve further comprises a low-pressure pipe, a first connecting pipe, a second connecting pipe and a high-pressure pipe, wherein the low-pressure pipe, the first connecting pipe and the second connecting pipe are all arranged on the valve seat assembly in a penetrating mode, and the first connecting pipe, the second connecting pipe and the low-pressure pipe are located in the opposite direction of the valve body; the high-pressure pipe is arranged on the first end cover; along with the sliding of the sliding block assembly, the first connecting pipe and the low-pressure pipe can be communicated through the sliding block assembly, and the high-pressure pipe and the second connecting pipe are communicated through the valve cavity; or the second connecting pipe is communicated with the low-pressure pipe through the sliding block assembly, and the high-pressure pipe is communicated with the first connecting pipe through the valve cavity.

It can be understood that, the low-pressure pipe in the middle is arranged on the other side of the first connecting pipe and the second connecting pipe, so that the influence of a welding gap does not need to be considered, the distance between the first connecting pipe and the low-pressure pipe and the distance between the low-pressure pipe and the second connecting pipe can be greatly reduced, and the length and the weight of the valve body can be reduced.

In one embodiment, the first end cap is welded to the high pressure tube.

So set up, can improve the joint strength of high-pressure pipe and first end cover.

In one embodiment, the first end cap is formed with a flange, and the high pressure tube portion extends into and is connected to the flange.

So set up, can further improve the joint strength of high-pressure pipe and first end cover.

In one embodiment, the first end cap is integrally formed with the high pressure tube.

So set up, can further improve the joint strength of high-pressure pipe and first end cover.

In one embodiment, the valve body further has a second end cap disposed at an end of the valve body remote from the first end cap.

By the arrangement, medium leakage can be avoided, and the influence on the use of the switching valve is avoided.

In one embodiment, the switching valve further includes: the pushing assembly is sleeved on the sliding block assembly and is connected with the sliding block assembly; and the elastic piece is positioned between the pushing assembly and the second end cover and is respectively connected with the pushing assembly and the second end cover.

So set up, the pushing assembly can make the pushing assembly remove the switching-over under the elastic component cooperation to the refrigeration or the mode of heating of switching-over valve are switched over.

In one embodiment, the pushing assembly comprises: the guide frame is sleeved on the sliding block assembly and is connected with the sliding block assembly; the piston is positioned at one end of the guide frame close to the second end cover and is connected with the guide frame; the elastic piece is positioned between the piston and the second end cover and is respectively connected with the piston and the second end cover.

So set up, can rely on the elastic force cooperation of differential pressure power and elastic component to reduce the figure of piston.

In one embodiment, the guide frame comprises: the body part is sleeved on the sliding block assembly and connected with the sliding block assembly, and one end of the body part, which is close to the second end cover, is connected with the piston; the limiting part is positioned at one end of the body part, which is far away from the piston, and is connected with the body part; when the sliding block assembly slides towards the first end cover along the axial direction of the valve body, the limiting part can be abutted against the first end cover so as to limit the sliding block assembly.

By the arrangement, the material consumption of the guide frame can be reduced, and the cost of the switching valve is reduced.

In one embodiment, the valve seat assembly comprises a first valve seat and a second valve seat which are arranged oppositely, the slider assembly is located between the first valve seat and the second valve seat, and two ends of the slider assembly respectively abut against the first valve seat and the second valve seat.

So set up, can avoid taking place to squint in the sliding block set spare motion process, improve the stability of diverter valve structure.

In one embodiment, a piston cavity is formed between the piston and the second end cover, and the switching valve further comprises a pilot valve; the first capillary tube is respectively connected with the pilot valve and the low-pressure tube; the second capillary tube is respectively connected with the pilot valve and the piston cavity; the third capillary tube is respectively connected with the pilot valve and the high-pressure tube; when the piston cavity is communicated with high pressure, the pushing assembly drives the sliding block assembly to move towards the first end cover under the action of the elastic piece, the first connecting pipe is communicated with the low-pressure pipe through the sliding block assembly, and the high-pressure pipe is communicated with the second connecting pipe through the valve cavity; when the piston cavity is communicated with low pressure, the pushing assembly drives the sliding block assembly to move towards the second end cover under the action of pressure difference, the second connecting pipe is communicated with the low-pressure pipe through the sliding block assembly, and the high-pressure pipe is communicated with the first connecting pipe through the valve cavity.

With this arrangement, the weight of the entire selector valve can be further reduced.

Compared with the prior art, the utility model provides a switching valve sets up in the opposite side that first takeover was taken over with the second through the low-pressure pipe that will be in the intermediate position, so need not to consider weld gap's influence, and the interval between first takeover and low-pressure pipe, low-pressure pipe and second takeover can reduce by a wide margin to can reduce the length and the weight of valve body.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a switching valve provided in the present application.

Fig. 2 is a cross-sectional view of a switching valve provided herein.

Fig. 3 is a cross-sectional view of a switching valve provided herein.

FIG. 4 is a cross-sectional view of a first endcap in an example embodiment of the present application.

FIG. 5 is a cross-sectional view of a first end cap in another embodiment of the present application.

Fig. 6 is a schematic structural diagram of a guide frame provided in the present application.

Fig. 7 is a schematic structural diagram of a slider assembly provided in the present application.

Fig. 8 is an exploded view of the slider assembly provided in the present application.

FIG. 9 is a front view of a slider assembly provided herein.

The symbols in the drawings represent the following meanings:

100. a switching valve; 10. a valve body; 11. a valve cavity; 111. a piston cavity; 12. a first end cap; 121. flanging; 13. a second end cap; 131. a main body portion; 132. a boss portion; 1321. accommodating grooves; 20. a valve seat assembly; 21. a first valve seat; 211. a first communication hole; 22. a second valve seat; 221. a second communication hole; 222. a third communication hole; 30. a slider assembly; 31. a plate spring; 32. a first slider; 33. a second slider; 34. a channel; 341. a first opening; 342. a second opening; 40. a pushing assembly; 41. a guide frame; 411. a body portion; 412. a limiting part; 42. a piston; 43. an elastic member; 50. a low pressure pipe; 60. a first connection pipe; 70. a second adapter tube; 80. a high pressure pipe; 90. a pilot valve; 91. a first capillary tube; 92. a second capillary tube; 93. a third capillary.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiment in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and therefore the application is not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used in the description of the present application are for illustrative purposes only and do not represent the only embodiments.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, the present application provides a switching valve 100, and the switching valve 100 is applied to an air conditioning system.

The switching valve 100 may be a three-way valve, a four-way valve, a five-way valve, a six-way valve, or the like. In the present application, a four-way valve is mainly taken as an example for detailed explanation.

The existing switching valve comprises a four-way valve, and the four-way valve comprises a valve body, a valve seat and a sliding block. The valve body is provided with a valve cavity; the valve seat is located in the valve cavity and connected with the valve body. The slider is abutted against the valve seat and can slide along the surface of the valve seat. The four-way valve further comprises a first connecting pipe, a low-pressure pipe and a second connecting pipe, wherein the first connecting pipe, the low-pressure pipe and the second connecting pipe are located on the same side of the valve body and are sequentially arranged. Because a gap needs to be reserved between the adjacent connecting pipes for welding the connecting pipes and the valve body, the whole length of the valve body is long, and the weight of the valve body is heavy.

In order to solve the above problem, please refer to fig. 2 and fig. 3, the present application provides a switching valve 100, which includes a valve body 10, a valve seat assembly 20 and a slider assembly 30, wherein the valve body 10 has a first end cap 12 and a valve cavity 11; the valve seat assembly 20 is located within the valve chamber 11 and is connected to the valve body 10. The sliding block assembly 30 is located in the valve cavity 11, and two ends of the sliding block assembly 30 respectively abut against two opposite inner walls of the valve seat assembly 20, and can slide on the valve seat assembly 20 along the axial direction of the valve body 10. The switching valve 100 further includes a low pressure pipe 50, a first connection pipe 60, a second connection pipe 70 and a high pressure pipe 80, the low pressure pipe 50, the first connection pipe 60 and the second connection pipe 70 are all disposed through the valve seat assembly 20, and the first connection pipe 60, the second connection pipe 70 and the low pressure pipe 50 are located in a relative direction of the valve body 10; a high pressure tube 80 is provided on the first end cap 12.

Along with the sliding of the sliding block assembly 30, the first connecting pipe 60 and the low-pressure pipe 50 can be communicated through the sliding block assembly 30, and the high-pressure pipe 80 and the second connecting pipe 70 are communicated through the valve cavity 11; alternatively, the second connection pipe 70 is communicated with the low pressure pipe 50 through the slider assembly 30, and the high pressure pipe 80 is communicated with the first connection pipe 60 through the valve chamber 11.

In the present application, since the low pressure pipe 50 located at the middle position is located at the other side of the first connection pipe 60 and the second connection pipe 70, the influence of the welding gap does not need to be considered, and the distances between the first connection pipe 60 and the low pressure pipe 50 and between the low pressure pipe 50 and the second connection pipe 70 can be greatly reduced, so that the length and the weight of the valve body 10 can be reduced, and the cost of the switching valve 100 can be further reduced.

Specifically, the conventional switching valve has a long overall length because the distance between adjacent pipes is generally 8 to 10 mm. In the present application, since the low pressure pipe 50 at the middle position is located at the other side of the first connection pipe 60 and the second connection pipe 70, the influence of the welding gap does not need to be considered, and the distance between the first connection pipe 60 and the low pressure pipe 50 and the distance between the low pressure pipe 50 and the second connection pipe 70 may be less than 7mm. The minimum distance between the first adapter 60 and the low pressure pipe 50 and between the low pressure pipe 50 and the second adapter 70 can be reduced to 2mm. For example, the distance between the first adapter 60 and the low pressure pipe 50 and the distance between the low pressure pipe 50 and the second adapter 70 may be 3mm, 4mm, or 5mm. Therefore, the distance between the connecting pipes can be significantly reduced, and the length of the valve body 10 can be reduced, thereby reducing the cost of the switching valve 100. Meanwhile, as the distance between the connection pipes is reduced, the distance that the slider assembly 30 needs to move is reduced, and therefore, the reversing speed of the slider assembly 30 is faster, thereby improving the working efficiency of the switching valve 100. It should be noted that the pitch here refers to the shortest distance between the pipe outer walls of the connection pipes.

Further, by providing the high-pressure pipe 80 at the first end cap 12, the refrigerant flow path can be improved. Specifically, if the high-pressure pipe 80 is provided on the peripheral side of the valve body 10, the refrigerant that has entered the valve chamber 11 from the high-pressure pipe 80 has two flow paths. One of the refrigerant flow paths is short, and the other refrigerant flows around the peripheral side of the slider assembly 30 nearly one circle and then enters the first connecting pipe 60 or the second connecting pipe 70, so that the overall flow path is long and is tortuous, and partial pressure loss exists in the refrigerant. When the high pressure pipe 80 is located at the first end cap 12, the refrigerants in the two flow paths have equal flow lengths and can directly enter the first adapter 60 or, respectively, flow through both sides of the slider assembly 30 for approximately half a cycle and enter the second adapter 70. Thus, the flow path of the refrigerant can be improved well, and the flow loss of the refrigerant can be reduced.

In one embodiment, referring to fig. 4, the first end cap 12 is welded to the high pressure tube 80. In this way, the strength of connection between the high-pressure pipe 80 and the first end cap 12 can be increased.

Further, the first end cap 12 is formed with a flange 121, and the high pressure pipe 80 partially extends into the flange 121 and is connected to the flange 121. The contact area between the first end cap 12 and the high-pressure pipe 80 is increased by providing the flange 121, so that the connection strength between the high-pressure pipe 80 and the first end cap 12 is further increased.

In another embodiment, referring to fig. 5, the first end cap 12 is integrally formed with the high pressure tube 80. Therefore, the processing is convenient, the connection strength of the high-pressure pipe 80 and the first end cover 12 is further improved, and the integral structural strength is improved. Meanwhile, the assembly time can be reduced, and the material consumption is reduced, so that the cost is reduced.

Referring to fig. 2, the valve body 10 further has a second end cap 13, and the second end cap 13 is disposed at an end of the valve body 10 away from the first end cap 12. The second end cap 13 is used to close the valve body 10, so that leakage of medium is avoided, which has an effect on the use of the switching valve 100.

The second end cap 13 includes a main body portion 131 and a protrusion portion 132. The main body 131 is at least partially located in the valve chamber 11 and connected to the inner wall of the valve chamber 11. The protrusion 132 has one end connected to the body 131 and the other end extending in a direction away from the valve body 10 along the axis of the valve body 10. The protruding portion 132 defines a receiving slot 1321 communicating with the valve chamber 11.

Further, the main body portion 131 is integrally formed with the protrusion portion 132. In this way, the processing is facilitated, the connection strength between the main body portion 131 and the boss portion 132 is further improved, and the structural strength of the entire second end cap 13 is improved. Meanwhile, the material consumption and the assembly time can be reduced, so that the cost can be reduced. In other embodiments, the main body 131 and the protrusion 132 may be provided separately and fixedly connected, as long as the same effect can be achieved.

Referring to fig. 2, the switching valve 100 further includes a pushing assembly 40 and an elastic member 43, the pushing assembly 40 is sleeved on the slider assembly 30 and connected to the slider assembly 30; the elastic member 43 is located between the pushing assembly 40 and the second end cap 13, and is connected to the pushing assembly 40 and the second end cap 13, respectively.

Specifically, an end of the elastic member 43 away from the pushing member 40 extends into the receiving slot 1321 and is connected to the protrusion 132. Through the cooperation of the differential pressure force and the elastic force of the elastic member 43, the pushing assembly 40 can drive the sliding block assembly 30 to slide on the valve seat assembly 20, so that the pushing assembly 40 is moved and reversed, thereby switching the cooling or heating mode of the switching valve 100.

Further, the pushing assembly 40 includes a guide frame 41 and a piston 42, the guide frame 41 is sleeved on the slider assembly 30 and connected with the slider assembly 30; the piston 42 is positioned at one end of the guide frame 41 close to the second end cover 13 and is connected with the guide frame 41; the elastic member 43 is located between the piston 42 and the second end cap 13, and is connected to the piston 42 and the second end cap 13, respectively.

The existing pushing assembly has two pistons, which are located at two ends of the guide frame respectively. The switching valve is respectively communicated with high pressure or low pressure at two ends of the pushing assembly through four capillary tubes, and the pushing assembly is moved by the aid of differential pressure, so that the sliding block assembly is driven to move in the valve cavity. In the present application, by providing the elastic member 43 between the piston 42 and the second end cap 13, the number of pistons 42 can be reduced by the pressure difference force in cooperation with the elastic force of the elastic member 43.

Specifically, in the switching valve 100 of the present application, the chamber on the left side of the piston 42 is always high-pressure. When high pressure is applied to the right side of the piston 42, the pressures at the two ends of the piston 42 are balanced, and the restoring force of the elastic member 43 is greater than the friction force of the piston 42 and the friction force of the slider assembly 30, so as to push the piston 42 to move leftward, thereby driving the guide frame 41 and the slider assembly 30 to move leftward. When the low pressure is applied to the right side of the piston 42, the piston 42 moves rightward under the action of the pressure difference, overcoming the elastic force of the elastic member 43 and the frictional resistance of the piston 42 and the slider assembly 30, thereby driving the guide frame 41 and the slider assembly 30 to move rightward. The number of pistons 42, i.e., one piston 42 in the present application, can be reduced since there is no need to rely on a differential pressure across the pushing assembly 40. The number of pistons 42 is reduced, and the lengths of the guide frame 41 and the valve body 10 can be significantly reduced, thereby reducing the amount of material used and further reducing the cost of the switching valve 100. On the other hand, the weight of the entire switching valve 100 can be reduced.

It should be noted that, for clarity, the upper, lower, left, and right sides of the switching valve 100 are defined in fig. 2.

In the present application, the protrusion 132 is provided with a certain length, but the length of the second end cap 13 can be increased less than the length of the valve body 10 reduced by one piston 42 by optimizing the parameters of the elastic member 43, so as to further reduce the overall length of the switching valve 100. And the body portion 131 limits the movement of the piston 42 in a direction toward the second end cap 13. When the pushing assembly 40 moves to the limit in the direction of approaching the second end cap 13, the piston 42 can abut against the main body portion 131. At this time, the elastic members 43 are all located in the accommodating grooves 1321 of the protrusions 132.

Referring to fig. 6, the guiding frame 41 includes a main body 411 and a limiting portion 412. The body part 411 is sleeved on the slider assembly 30 and connected with the slider assembly 30, and one end of the body part 411 close to the second end cover 13 is connected with the piston 42; the limiting portion 412 is located at an end of the main body 411 away from the piston 42 and connected to the main body 411. When the slider assembly 30 slides towards the first end cover 12 along the axial direction of the valve body 10, the limiting portion 412 can abut against the first end cover 12 to limit the slider assembly 30.

The guide frame 41 is sleeved on the slider assembly 30 through the body 411, so as to drive the slider assembly 30 to slide on the valve seat assembly 20. The limiting portion 412 can limit the movement of the slider assembly 30 toward the first end cover 12, and meanwhile, along the radial direction of the valve body 10, the width of the limiting portion 412 is smaller than that of the body portion 411, so that the material usage amount of the guide frame 41 can be reduced, and the weight and the cost of the switching valve 100 can be reduced.

Referring to fig. 2, the valve seat assembly 20 includes a first valve seat 21 and a second valve seat 22 disposed opposite to each other, the slider assembly 30 is located between the first valve seat 21 and the second valve seat 22, and two ends of the slider assembly 30 respectively abut against the first valve seat 21 and the second valve seat 22. One side of the first valve seat 21 and one side of the second valve seat 22 are cambered surfaces, so that the first valve seat and the second valve seat can be matched with the valve body 10 to facilitate connection with the valve body 10. The other sides of the first valve seat 21 and the second valve seat 22 are planes which are parallel to each other and are respectively abutted against the end surfaces of the sliding blocks, so that the sliding blocks can move in the valve cavity 11 conveniently, the radial deviation of the sliding blocks towards the valve body 10 in the moving process is avoided, and the structural stability of the switching valve 100 is improved.

Further, the first valve seat 21 is provided with a first communicating hole 211, and one end of the low-pressure pipe 50 is inserted into the first communicating hole 211; the second valve seat 22 is opened with a second communication hole 221 and a third communication hole 222, one end of the first adapter tube 60 is inserted into the second communication hole 221, and one end of the second adapter tube 70 is inserted into the third communication hole 222. By opening the first, second, and third communication holes 211, 221, and 222, connection with the adapter pipe is facilitated, and the flow of the refrigerant in the switching valve 100 can be realized.

Referring to fig. 2 and 7, the slider assembly 30 has passages 34 formed therein through both ends of the slider assembly 30. The slider assembly 30 can realize the circulation of both sides about the diverter valve 100, and slider assembly 30 receives the pressure differential direction for by slider assembly 30 week side towards the direction of slider assembly 30 axis, and the passageway 34 both ends of slider assembly 30 are in pressure balance's state, and the pressure differential power that the upper and lower direction received is nearly zero, therefore the frictional resistance that slider assembly 30 received at the switching-over in-process is little, and the switching-over is nimble, and slider assembly 30 blocks the dead risk and hangs down. Meanwhile, the degree of damage of the sliding block assembly 30 due to friction is small, the service life of the sliding block assembly 30 is longer, and therefore the cost of the switching valve 100 is reduced. Moreover, because the sliding resistance of the slider assembly 30 is small, the elastic member 43 is arranged at one end of the pushing assembly 40, and the slider assembly 30 can be reversed by means of the cooperation of the pressure difference force and the elastic force of the elastic member 43. In this manner, the length of the push assembly 40 can be reduced, enabling a further reduction in the overall length of the switching valve 100.

Referring to fig. 2, 7 and 8, the sliding block assembly 30 includes a plate spring 31, and a first sliding block 32 and a second sliding block 33 disposed opposite to each other, one end of the second sliding block 33 extends into the first sliding block 32, and the plate spring 31 is located between the first sliding block 32 and the second sliding block 33.

By dividing the slider assembly 30 into the first slider 32, the second slider 33, and the plate spring 31, it is possible to better apply to assembly needs. If the integral slide block has machining errors, the slide block is difficult to be matched with the valve seat assembly, and the slide block can only be scrapped, so that the production cost of the switching valve is improved. Slider assembly 30 in this application is through setting up leaf spring 31, rely on leaf spring 31's elastic deformation, can stretch into the distance in the first slider 32 according to clearance adjustment second slider 33 between first valve seat 21 and second valve seat 22 automatically, thereby make slider assembly 30 and valve seat assembly 20 closely laminate, offset the clearance between slider assembly 30 and the valve seat assembly 20 that machining error arouses, the assembly is simpler, and the sealed more reliable between slider assembly 30 and valve seat assembly 20. Meanwhile, the elastic force provided by the deformation of the plate spring 31 is much smaller than the pressure difference force of the conventional structure, so that the abrasion of the slider assembly 30 is also small, and the slider assembly 30 has a longer service life.

In an embodiment, referring to fig. 2, 7 and 9, the guiding frame 41 is sleeved around the second sliding block 33, and one end of the guiding frame abuts against the first sliding block 32, and the other end of the guiding frame abuts against the plate spring 31. The second slider 33 abuts on the side of the plate spring 31 remote from the guide frame 41. The first slider 32 is located between the guide frame 41 and the first valve seat 21, and is attached to the first valve seat 21 and the guide frame 41, respectively. In this way, the second slider 33 can be brought into close contact with the second valve seat 22 by the leaf spring 31, and the influence of the machining error can be partially cancelled out.

In another embodiment, the guiding frame 41 is sleeved on the periphery of the first sliding block 32, and two sides of the plate spring 31 respectively abut against the first sliding block 32 and the second sliding block 33. In this way, the first slider 32 and the second slider 33 can be brought into contact with the first valve seat 21 and the second valve seat 22, respectively, by the plate spring 31 and can be brought into close contact with each other, and the influence of machining errors can be cancelled.

Further, referring to fig. 8, a first opening 341 is formed at one end of the first slider 32 close to the first valve seat 21, and the area of the first opening 341 is S1; one end of the second slider 33 close to the second valve seat 22 is provided with a second opening 342, the area of the second opening 342 is S2, and S1/S2 is more than 1 and less than or equal to 1.1.

Specifically, the end of the passage 34 near the first valve seat 21 is a first opening 341, and the end of the passage 34 near the second valve seat 22 is a second opening 342. By setting 1 < S1/S2 < 1.1, the sizes of the first opening 341 and the second opening 342 are approximately equal, so that the pressures at two ends of the channel 34 can be ensured to be approximately equal, and the sliding block assembly 30 can only be acted by high-pressure refrigerants around the sliding block assembly 30 when sliding on the valve seat assembly 20, thereby reducing the reversing resistance of the sliding block assembly 30 and further improving the use performance of the switching valve 100. For example, S1/S2 may be 1.02, 1.03, or 1.04. On the other hand, since the reversing resistance of the slider assembly 30 is reduced, i.e., the frictional force of the elastic member 43 required to overcome the slider assembly 30 is reduced, the slider assembly 30 can be more easily reversed using the elastic force of the elastic member 43.

In one embodiment, referring to fig. 1-3, a piston cavity 111 is formed between the piston 42 and the second end cap 13. The switching valve 100 further includes a pilot valve 90, a first capillary tube 91, a second capillary tube 92, and a third capillary tube 93. The first capillary 91 is respectively connected with the pilot valve 90 and the low-pressure pipe 50; the second capillary 92 is respectively connected with the pilot valve 90 and the piston cavity 111; the third capillary tube 93 is connected to the pilot valve 90 and the high-pressure tube 80, respectively. When the piston cavity 111 is charged with high pressure, under the action of the elastic member 43, the pushing assembly 40 drives the slider assembly 30 to move toward the first end cover 12, the first connection pipe 60 is communicated with the low-pressure pipe 50 through the slider assembly 30, and the high-pressure pipe 80 is communicated with the second connection pipe 70 through the valve cavity 11. When the piston cavity 111 is filled with low pressure, under the action of pressure difference, the pushing assembly 40 drives the sliding block assembly 30 to move towards the second end cover 13, the second connecting pipe 70 is communicated with the low pressure pipe 50 through the sliding block assembly 30, and the high pressure pipe 80 is communicated with the first connecting pipe 60 through the valve cavity 11.

The switching valve 100 controls the movement of the slider assembly 30 within the valve cavity 11 through the pilot valve 90 to change the flow path of the refrigerant.

Referring to fig. 2, when the pilot valve 90 applies high pressure to the piston chamber 111. Specifically, the high-pressure medium in the high-pressure pipe 80 sequentially enters the piston cavity 111 through the third capillary 93, the pilot valve 90, and the second capillary 92, so that a high pressure is formed in the piston cavity 111. At the same time, since the left side of the piston 42 is at high pressure, the pressure on both sides of the piston 42 is balanced. The restoring force of the elastic member 43 is larger than the friction force of the piston 42 and the friction force of the slider assembly 30, and pushes the piston 42 to move leftward, so as to drive the guide frame 41 and the slider assembly 30 to move leftward. The sliding block assembly 30 connects the first connection pipe 60 and the low pressure pipe 50, and the high pressure pipe 80 and the second connection pipe 70 are communicated through the valve chamber 11.

Referring to fig. 3, when the pilot valve 90 is venting low pressure into the piston chamber 111. Specifically, the high-pressure medium in the piston cavity 111 is discharged into the low-pressure pipe 50 through the second capillary 92, the pilot valve 90, and the first capillary 91 in sequence, and a low pressure is formed in the piston cavity 111. At this time, since the left side of the piston 42 is under high pressure, the piston 42 moves rightward under the action of the pressure difference, overcoming the elastic force of the elastic member 43 and the frictional resistance of the piston 42 and the slider assembly 30, thereby driving the guide frame 41 and the slider assembly 30 to move rightward. The slide block assembly 30 is reversed to connect the second connecting pipe 70 with the low pressure pipe 50, and the high pressure pipe 80 is communicated with the first connecting pipe 60 through the valve chamber 11.

In the present application, the switching of the switching valve 100 can be achieved by only three capillary tubes. Compared with the structure of the conventional switching valve 100, one capillary can be reduced, and the weight of the entire switching valve 100 can be further reduced.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims (10)

1. A switching valve, comprising:

a valve body (10) having a first end cap (12) and a valve cavity (11);

the valve seat assembly (20) is positioned in the valve cavity (11) and is connected with the valve body (10);

the sliding block assembly (30) is positioned in the valve cavity (11), two ends of the sliding block assembly (30) are respectively abutted against two opposite inner walls of the valve seat assembly (20), and the sliding block assembly can slide on the valve seat assembly (20) along the axial direction of the valve body (10);

the switching valve further comprises a low-pressure pipe (50), a first connecting pipe (60), a second connecting pipe (70) and a high-pressure pipe (80), the low-pressure pipe (50), the first connecting pipe (60) and the second connecting pipe (70) are all arranged on the valve seat assembly (20) in a penetrating mode, and the first connecting pipe (60), the second connecting pipe (70) and the low-pressure pipe (50) are located in the opposite direction of the valve body (10); the high pressure pipe (80) is arranged on the first end cover (12);

with the sliding of the sliding block assembly (30), the first connecting pipe (60) and the low-pressure pipe (50) can be communicated through the sliding block assembly (30), and the high-pressure pipe (80) and the second connecting pipe (70) are communicated through the valve cavity (11); or the second connecting pipe (70) is communicated with the low-pressure pipe (50) through the sliding block assembly (30), and the high-pressure pipe (80) is communicated with the first connecting pipe (60) through the valve cavity (11).

2. The switching valve according to claim 1, wherein the first end cap (12) is welded to the high pressure tube (80).

3. The switching valve according to claim 2, characterized in that the first end cap (12) is formed with a bead (121), the high-pressure pipe (80) extending partly into the bead (121) and being connected to the bead (121).

4. The switching valve according to claim 1, wherein the first end cap (12) is integrally formed with the high pressure tube (80).

5. The switching valve according to claim 1, characterized in that the valve body (10) further has a second end cap (13), the second end cap (13) being provided at an end of the valve body (10) remote from the first end cap (12).

6. The switching valve of claim 5, further comprising:

the pushing assembly (40) is sleeved on the sliding block assembly (30) and is connected with the sliding block assembly (30);

and the elastic piece (43) is positioned between the pushing assembly (40) and the second end cover (13) and is respectively connected with the pushing assembly (40) and the second end cover (13).

7. The switching valve according to claim 6, characterized in that the pushing assembly (40) comprises:

the guide frame (41) is sleeved on the sliding block assembly (30) and is connected with the sliding block assembly (30);

a piston (42) located at one end of the guide frame (41) close to the second end cap (13) and connected with the guide frame (41);

wherein the elastic piece (43) is positioned between the piston (42) and the second end cover (13) and is respectively connected with the piston (42) and the second end cover (13).

8. The switching valve according to claim 7, wherein the guide frame (41) comprises:

the body part (411) is sleeved on the sliding block assembly (30) and connected with the sliding block assembly (30), and one end, close to the second end cover (13), of the body part (411) is connected with the piston (42);

the limiting part (412) is positioned at one end, far away from the piston (42), of the body part (411) and is connected with the body part (411);

when the sliding block assembly (30) slides towards the first end cover (12) along the axial direction of the valve body (10), the limiting part (412) can be abutted against the first end cover (12) so as to limit the sliding block assembly (30).

9. The switching valve according to claim 7, wherein the valve seat assembly (20) comprises a first valve seat (21) and a second valve seat (22) which are oppositely arranged, the slider assembly (30) is located between the first valve seat (21) and the second valve seat (22), and two ends of the slider assembly (30) respectively abut against the first valve seat (21) and the second valve seat (22).

10. The switching valve according to claim 9, wherein a piston cavity (111) is formed between the piston (42) and the second end cap (13), the switching valve further comprising:

a pilot valve (90);

a first capillary tube (91) connected to the pilot valve (90) and the low-pressure pipe (50), respectively;

a second capillary tube (92) connected to the pilot valve (90) and the piston chamber (111), respectively;

a third capillary (93) connected to the pilot valve (90) and the high-pressure pipe (80), respectively;

when the piston cavity (111) is communicated with high pressure, under the action of the elastic piece (43), the pushing assembly (40) drives the slider assembly (30) to move towards the first end cover (12), the first connecting pipe (60) is communicated with the low-pressure pipe (50) through the slider assembly (30), and the high-pressure pipe (80) is communicated with the second connecting pipe (70) through the valve cavity (11);

when the piston cavity (111) is communicated with low pressure, under the action of differential pressure, the pushing assembly (40) drives the sliding block assembly (30) to move towards the second end cover (13), the second connecting pipe (70) is communicated with the low pressure pipe (50) through the sliding block assembly (30), and the high pressure pipe (80) is communicated with the first connecting pipe (60) through the valve cavity (11).

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