Switching valve

Abstract

The utility model discloses a switching valve which comprises a valve seat, a piston assembly and an elastic assembly. The valve seat is provided with a valve cavity, and the valve cavity comprises a first valve cavity and a second valve cavity which are communicated; at least part of the piston assembly is movably arranged in the valve cavity, and the piston assembly comprises a piston rod, a first piston and a second piston; the first piston is connected to the piston rod and moves in the first valve cavity; the second piston is connected to the piston rod and moves in the second valve cavity; the elastic assembly is connected to the piston assembly, is located in the first valve cavity and is not located in the second valve cavity, and is used for enabling the piston assembly to be in a balanced state; wherein the balance state means that the piston assembly keeps still relative to the valve seat under the condition of no fluid impact.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a switching valve. BACKGROUND

[0002] The switching valve comprises a valve seat, a piston assembly and two springs. The piston assembly comprises a piston rod and two pistons. The valve seat has a valve cavity, which comprises a first chamber for mounting one of the pistons and a second chamber for mounting the other piston. One spring is located in the first chamber and the other spring is located in the second chamber. The piston assembly is movable in the valve cavity of the valve seat under the drive of fluid pressure, thereby realizing switching of a flow path. The two springs are used to provide elastic force to the piston assembly, so that the switching valve can quickly return to an equilibrium state after being impacted by fluid and switch to different working conditions.

[0003] In the related art, the installation process of a mechanical switching valve is as follows: first, the piston rod and one of the pistons are assembled together, then the two springs are assembled, and finally the other piston is connected to the piston rod. However, when the other piston is assembled to the piston rod, the piston will be subjected to the force of the two springs, which makes the assembly of the piston inconvenient and affects the assembly efficiency. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide a switching valve to solve the problem of inconvenient assembly of the switching valve in the related art.

[0005] The switching valve of the embodiments of the present application comprises:

[0006] The valve seat has a valve cavity, which comprises a first valve cavity and a second valve cavity connected in communication.

[0007] The piston assembly is movably arranged in the valve cavity. The piston assembly comprises a piston rod, a first piston and a second piston. The first piston is connected to the piston rod and movable in the first valve cavity. The second piston is connected to the piston rod and movable in the second valve cavity.

[0008] The elastic assembly is connected to the piston assembly. The elastic assembly is located in the first valve cavity and not located in the second valve cavity, and is used to make the piston assembly in an equilibrium state. The equilibrium state refers to that the piston assembly remains stationary relative to the valve seat under no fluid impact.

[0009] According to some embodiments of the present application, the elastic assembly comprises two elastic members. Both of the elastic members are connected to the piston assembly and located in the first valve cavity.

[0010] According to some embodiments of the present application, when the piston assembly is in the balanced state, each of the elastic members is limited between the piston assembly and the valve seat; each of the elastic members is in an original length state or a compressed state, and the two elastic members in the compressed state provide elastic force to the piston assembly in opposite directions.

[0011] According to some embodiments of the present application, one of the two elastic members is defined as a first elastic member.

[0012] The piston assembly has a first limiting groove, and at least a part of the first elastic member is located in the first limiting groove.

[0013] According to some embodiments of the present application, a groove wall of the first limiting groove has a first interference fit part, and the first elastic member is interference fit with the first interference fit part.

[0014] According to some embodiments of the present application, an inner wall surface of the valve cavity has a second valve port, and the second piston is used to open or block the second valve port; when the second valve port is in an open state, a gap is formed between a top of the first elastic member and the valve seat.

[0015] According to some embodiments of the present application, the plug rod has a guide section, the first limiting groove is arranged at an end of the guide section, and two ends of the first elastic member are respectively in abutment with a bottom wall of the first limiting groove and the valve seat.

[0016] According to some embodiments of the present application, the other of the two elastic members is defined as a second elastic member.

[0017] The piston assembly has a second limiting groove, and at least a part of the second elastic member is located in the second limiting groove.

[0018] According to some embodiments of the present application, an inner wall surface of the valve cavity is provided with a partition part, and two sides of the partition part are respectively the first valve cavity and the second valve cavity.

[0019] The first piston sleeve is sleeved on an outer peripheral side surface of the piston rod, and the first piston and the piston rod surround the second limiting groove, an opening of the second limiting groove faces the partition part, and the second elastic member is sleeved on an outer periphery of a part of the piston rod surrounded by the second limiting groove; two ends of the second elastic member are respectively in abutment with a bottom wall of the second limiting groove and the valve seat.

[0020] According to some embodiments of the present application, a groove wall of the second limiting groove has a second interference fit part, and the second elastic member is interference fit with the second interference fit part.

[0021] According to some embodiments of the present application, the inner wall surface of the valve cavity is provided with a partition, and the first valve cavity and the second valve cavity are located on two sides of the partition, respectively.

[0022] The inner wall surface of the valve cavity is provided with a first valve port, and the first piston is configured to open or block the first valve port.

[0023] According to some embodiments of the present application, the valve seat is provided with a guide groove, and the piston assembly is provided with a guide segment, which is arranged in the guide groove and guided by the outer peripheral side surface of the guide segment and the groove side wall of the guide groove.

[0024] According to some embodiments of the present application, the elastic assembly includes two elastic members, and both of the elastic members are connected to the piston assembly.

[0025] The guide groove side wall and the outer peripheral side surface of the guide segment are provided with at least one air guide groove, which is in communication with the first limiting groove and the first valve cavity, respectively.

[0026] According to some embodiments of the present application, the inner wall surface of the first valve cavity is provided with a first valve port, the inner wall surface of the second valve cavity is provided with a second valve port, the first piston is provided with a first sealing member configured to open or block the first valve port, and the second piston is provided with a second sealing member configured to open or block the second valve port.

[0027] The inner wall surface of the valve cavity is provided with a partition, and the first valve cavity and the second valve cavity are located on two sides of the partition, respectively.

[0028] When the first sealing member of the first piston blocks the first valve port, the first piston is in contact with the first stop surface, and when the second sealing member of the second piston blocks the second valve port, the second piston is in contact with the second stop surface.

[0029] According to some embodiments of the present application, the partition is provided with a guide hole, and the piston rod is movably arranged in the guide hole and guided by the hole wall of the guide hole.

[0030] According to some embodiments of the present application, when the piston assembly is in a balanced state, the lengths of the two elastic members along the valve axial direction are equal.

[0031] The above-mentioned embodiment has at least the following advantages or beneficial effects:

[0032] In the switching valve of this embodiment, the first piston and the second piston are located in the first valve chamber and the second valve chamber, respectively, and the elastic component is located in the first valve chamber but not in the second valve chamber. This ensures that during valve assembly, the later-assembled piston is not directly subjected to the reaction force provided by the elastic component, facilitating its placement on the piston rod. Furthermore, since the later-assembled piston is not directly subjected to the reaction force of the elastic component, its position relative to the piston rod is easier to determine, eliminating the need for additional guide fixtures and reducing assembly difficulty. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0034] Figure 1 The diagram shown is a perspective view of the switching valve according to the first embodiment of this application.

[0035] Figure 2 The diagram shows along Figure 1 A schematic diagram obtained after cutting along the AA section line.

[0036] Figure 3 What is shown is Figure 2 A schematic diagram of the piston assembly in a balanced state.

[0037] Figure 4 The diagram shown is a perspective view of the switching valve according to the second embodiment of this application.

[0038] Figure 5 The diagram shows along Figure 4 A schematic diagram obtained after cutting along the BB section line.

[0039] Figure 6 What is shown is Figure 4 A three-dimensional schematic diagram of the piston rod and the first piston connected together.

[0040] The reference numerals in the attached figures are explained as follows:

[0041] 100. Valve seat

[0042] 101. Valve cavity

[0043] 101a, First valve chamber

[0044] 101b, Second valve chamber

[0045] 102. First valve port

[0046] 103, second valve port

[0047] 110, partition

[0048] 111, first stop surface

[0049] 112, second stop surface

[0050] 113, guide hole

[0051] 120, guide groove

[0052] 130, first valve body

[0053] 140, second valve body

[0054] 151, first opening

[0055] 152, second opening

[0056] 153, third opening

[0057] 200, piston assembly

[0058] 210, piston rod

[0059] 220, first piston

[0060] 221, first sealing member

[0061] 222, first inclined surface

[0062] 230, second piston

[0063] 231, second sealing member

[0064] 232, second inclined surface

[0065] 240, first limiting groove

[0066] 241, first interference fit portion

[0067] 250, second limiting groove

[0068] 251, second interference fit portion

[0069] 260, guide section

[0070] 261, air guide groove

[0071] 300, elastic assembly

[0072] 310, elastic member

[0073] 310a, first elastic member

[0074] 310b, second elastic member DETAILED DESCRIPTION

[0075] Example implementations are now described in greater detail with reference to the figures. Like reference numerals can be used to denote like elements throughout the figures. The example implementations can be implemented in numerous ways, and are not limited to the implementations described herein; instead, the implementations described herein provide one or more example implementations for the example implementations to provide a thorough and enabling disclosure and fully convey the scope of the example implementations to those skilled in the art. Numerous specific details are described in order to provide a thorough and enabling disclosure. However, the example implementations can be practiced without the specific details. In other instances, well known methods, procedures, components, and networks have not been described in detail since it would be

[0076] It is to be understood that the terminology "including", "containing", "having" and "including" and any variations thereof used herein are intended to be open-ended and do not pertain to a limitation on the example implementations. For example, a process, method, system, product, or apparatus that comprises a list of steps or elements is not necessarily limited to those listed steps or elements but can include additional steps or elements not expressly listed or inherent to such process, method, system, product, or apparatus.

[0077]

First embodiment

[0078] As shown in FIGS. 1 and 2, the switching valve of the present embodiment includes a valve seat 100, a piston assembly 200, and an elastic assembly 300. The valve seat 100 includes a valve cavity 101 having a valve port. At least a portion of the piston assembly 200 is movably arranged in the valve cavity 101 for blocking or opening the valve port. The elastic assembly 300 is connected to the piston assembly 200 for keeping the piston assembly 200 in a balanced state; wherein the balanced state means that the piston assembly 200 remains stationary relative to the valve seat 100 without fluid impact. Figure 1 Figure 2 The valve port includes a first valve port 102 and a second valve port 103. The valve seat 100 further has a first opening 151, a second opening 152, and a third opening 153, all of which are in communication with the valve cavity 101. The first opening 151, the second opening 152, and the third opening 153 are arranged in sequence along the axial direction of the switching valve (i.e. the movement direction of the piston assembly 200), and the first valve port 102 is located between the first opening 151 and the second opening 152, and the second valve port 103 is located between the second opening 152 and the third opening 153.

[0079] When the piston assembly 200 blocks the first valve port 102, the second valve port 103 is in an open state, and at this time the second opening 152 is in communication with the third opening 153 through the second valve port 103; when the piston assembly 200 blocks the second valve port 103, the first valve port 102 is in an open state, and at this time the first opening 151 is in communication with the second opening 152 through the first valve port 102.

[0080] When the piston assembly 200 blocks the first valve port 102, the second valve port 103 is in an open state, and at this time the second opening 152 is in communication with the third opening 153 through the second valve port 103; when the piston assembly 200 blocks the second valve port 103, the first valve port 102 is in an open state, and at this time the first opening 151 is in communication with the second opening 152 through the first valve port 102.

[0081] ​In one embodiment, the valve seat 100 includes a first valve body 130 and a second valve body 140. The first valve body 130 is connected to the second valve body 140 and forms a valve cavity 101. In this embodiment, the first valve body 130 is a cylindrical structure with openings at both ends. A first valve port 102 and a second valve port 103 are formed on the first valve body 130. A second opening 152 and a third opening 153 are formed on the first valve body 130. For example, the second opening 152 is formed on the side wall of the cylindrical structure, one end of the cylindrical structure is the third opening 153, and the second valve body 140 covers the other end opening of the cylindrical structure. A first opening 151 is formed on the second valve body 140.

[0082] like Figure 2 As shown, the piston assembly 200 includes a piston rod 210, a first piston 220, and a second piston 230. Both the first piston 220 and the second piston 230 are connected to the piston rod 210. The first piston 220 is used to block or open the first valve port 102, and the second piston 230 is used to block or open the second valve port 103. In the embodiments of this application, when the first piston 220 blocks the first valve port 102, the second piston 230 opens the second valve port 103; when the second piston 230 blocks the second valve port 103, the first piston 220 opens the first valve port 102.

[0083] The inner wall of valve chamber 101 is provided with a partition 110, which divides valve chamber 101 into a first valve chamber 101a and a second valve chamber 101b. The inner wall of the first valve chamber 101a has a first valve port 102, and the inner wall of the second valve chamber 101b has a second valve port 103. In this embodiment, the partition 110 is formed on the inner wall of the first valve body 130. The piston rod 210 is guided and engaged with the partition 110. The first piston 220 is located on one side of the partition 110 along the axial direction of the piston rod 210, that is, the first piston 220 moves in the first valve chamber 101a. The second piston 230 is located on the other side of the partition 110 along the axial direction of the piston rod 210, that is, the second piston 230 moves in the second valve chamber 101b. The elastic component 300 is located on one side of the partition 110 along the axial direction of the piston rod 210, that is, the elastic component 300 and the first piston 220 are located on the same side of the partition 110, or the elastic component 300 and the second piston 230 are located on the same side of the partition 110. In the embodiment of this application, the elastic component 300 and the first piston 220 are located in the first valve chamber 101a, while the elastic component 300 is not located in the second valve chamber 101b.

[0084] In the assembly of the switching valve, the first piston 220 and the piston rod 210 are assembled first, then the elastic assembly 300 is assembled, then the valve seat 100 is assembled, at this time the elastic assembly 300 and the first piston 220 are located on the same side of the partition 110, and finally the second piston 230 is assembled. Since the second piston 230 and the elastic assembly 300 are located on the opposite sides of the partition 110, when the second piston 230 is assembled on the piston rod 210, the second piston 230 is not directly subjected to the reaction force provided by the elastic assembly 300, so that the second piston 230 is assembled on the piston rod 210. In addition, since the second piston 230 is not subjected to the reaction force of the elastic assembly 300, the position of the second piston 230 relative to the piston rod 210 is more easily controlled when the second piston 230 is installed, and additional guiding tools are saved, and the assembly difficulty is reduced.

[0085] Therefore, in the switching valve of the embodiment of the application, the first piston 220 and the second piston 230 are located in the first valve cavity 101a and the second valve cavity 101b respectively, and the elastic assembly 300 is located in the first valve cavity 101a and not located in the second valve cavity 101b. Therefore, when the switching valve is assembled, the piston assembled later is not directly subjected to the reaction force provided by the elastic assembly 300, so that the piston assembled later is assembled on the piston rod 210. In addition, since the piston assembled later is not subjected to the reaction force of the elastic assembly 300, the position of the piston assembled later relative to the piston rod 210 is more easily controlled, additional guiding tools are saved, and the assembly difficulty is reduced.

[0086] The elastic assembly 300 includes two elastic members, both of which are connected to the piston assembly 200 and located on the same side of the partition 110 along the axial direction of the piston rod 210. For the convenience of description, the two elastic members are defined as a first elastic member 310a and a second elastic member 310b.

[0087] In the assembly of the switching valve, the first piston 220 and the piston rod 210 are assembled first, then the first elastic member 310a and the second elastic member 310b are assembled, then the aforementioned assembled components are assembled into the valve seat 100, and the piston rod 210 is guided and matched with the partition 110, and finally the second piston 230 is assembled. In the process of assembling the second piston 230 and the piston rod 210, the second piston 230 is not directly subjected to the elastic force provided by the second elastic member 310b, so that the installation process of the second piston 230 is more convenient.

[0088] It should be noted that when the second piston 230 is assembled with the piston rod 210, although the piston rod 210 will be subjected to the reaction force of the first elastic member 310a, since the piston rod 210 is guided by the partition 110, when the second piston 230 is assembled, the movement direction of the piston rod 210 is also limited to the axial direction of the piston rod 210, and no deflection occurs, which does not affect the installation position of the second piston 230 relative to the piston rod 210.

[0089] In an embodiment, the first elastic member 310a and the second elastic member 310b are springs, or other components capable of providing elastic force under pressure, such as rubber components.

[0090] In an embodiment, when the piston assembly 200 is in a balanced state, the length of the first elastic member 310a in the valve axial direction is equal to the length of the second elastic member 310b in the valve axial direction.

[0091] In the embodiment of the present application, the first elastic member 310a is connected to the second valve body 140 and the piston rod 210, and is used to provide the first elastic force to the piston assembly 200 in the direction of blocking the first valve port 102. The second elastic member 310b is connected to the piston assembly 200 and the partition 110, and is used to provide the second elastic force to the piston assembly 200 in the direction of blocking the second valve port 103. The direction of the first elastic force provided by the first elastic member 310a to the piston assembly 200 is opposite to the direction of the second elastic force provided by the second elastic member 310b to the piston assembly 200.

[0092] In an embodiment, the partition 110 has a guide hole 113 which penetrates the partition 110 in the axial direction of the piston rod 210. The piston rod 210 is movably arranged in the guide hole 113 and guided by the hole wall of the guide hole 113.

[0093] As shown in FIG. 1, one end of the first elastic member 310a and one end of the second elastic member 310b are fixedly connected to the piston assembly 200. Figure 2

[0094] In the embodiment of the present application, one end of the first elastic member 310a is fixedly connected to the piston assembly 200, which can avoid noise caused by the first elastic member 310a when the piston assembly 200 blocks the first valve port 102 and opens the second valve port 103. One end of the second elastic member 310b is fixedly connected to the piston assembly 200, which can avoid noise caused by the second elastic member 310b when the piston assembly 200 blocks the second valve port 103 and opens the first valve port 102.

[0095] ​In one embodiment, the piston assembly 200 has a first limiting groove 240 and a second limiting groove 250, at least a portion of the first elastic member 310a is limited within the first limiting groove 240, and at least a portion of the second elastic member 310b is limited within the second limiting groove 250.

[0096] In the embodiments of this application, since at least a portion of the first elastic member 310a is confined within the first limiting groove 240 and at least a portion of the second elastic member 310b is confined within the second limiting groove 250, the axial dimension of the switching valve is reduced, which is beneficial for product miniaturization design.

[0097] In one embodiment, the piston rod 210 has a first limiting groove 240, the groove wall of the first limiting groove 240 has a first interference fit portion 241, and the first elastic member 310a is interference-fitted with the first interference fit portion 241. Of course, in other embodiments, the first elastic member 310a can also be fixedly connected to the piston rod 210 by means of snap-fit, riveting, welding, etc., and this application does not make any particular limitation in this regard.

[0098] In one embodiment, a first piston 220 is sleeved on the outer peripheral side of a piston rod 210, and the first piston 220 and the piston rod 210 form a second limiting groove 250, the opening of which faces the partition portion 110. A second elastic member 310b is sleeved on the outer periphery of the portion of the piston rod 210 surrounded by the second limiting groove 250 and is fixedly connected to the piston rod 210. Both ends of the second elastic member 310b abut against the bottom wall of the second limiting groove 250 and the partition portion 110, respectively.

[0099] In one embodiment, the groove wall of the second limiting groove 250 has a second interference fit portion 251, and the second elastic member 310b is interference fitted with the second interference fit portion 251.

[0100] Of course, in other embodiments, the second limiting groove 250 may also be formed on the piston rod 210, or the second limiting groove 250 may be formed on the first piston 220.

[0101] In one embodiment, when the second valve port 103 is in the open state, there is a gap between the top of the first elastic member 310a and the second valve body 140.

[0102] In one embodiment, when the first valve port 102 is in the open state, there is a gap between the bottom of the second elastic member 310b and the partition portion 110.

[0103] like Figure 2 As shown, the second valve body 140 of the valve seat 100 has a guide groove 120, and the piston rod 210 has a guide section 260. The guide section 260 is disposed in the guide groove 120, and the outer peripheral side of the guide section 260 is guided and engaged with the groove side wall of the guide groove 120.

[0104] In this embodiment of the application, the guide section 260 and the guide groove 120 are guided and cooperated to ensure the accuracy of the movement trajectory of the piston assembly 200, avoid the piston assembly 200 from deflecting, and ensure the sealing of the first piston 220 blocking the first valve port 102 and the second piston 230 blocking the second valve port 103.

[0105] In one embodiment, a first limiting groove 240 is formed in the guide section 260 of the piston rod 210, and the first limiting groove 240 is disposed at the end of the guide section 260. The two ends of the first elastic member 310a abut against the bottom wall of the first limiting groove 240 and the bottom wall of the guide groove 120, respectively.

[0106] There is a small gap between the outer peripheral side of the guide section 260 and the side wall of the guide groove 120. When the piston assembly 200 reciprocates, the fluid cannot quickly pass through the gap to generate a certain pressure difference. Thus, the gap can buffer the piston assembly 200 and prevent excessive impact noise from being generated when the piston assembly 200 switches.

[0107] like Figure 2 As shown, the partition 110 has a first stop surface 111 and a second stop surface 112 on both sides along the axial direction of the piston rod 210; the first piston 220 has a first sealing element 221 for sealing the first valve port 102, and the second piston 230 has a second sealing element 231 for sealing the second valve port 103. When the first piston 220 blocks the first valve port 102, the first piston 220 contacts the first stop surface 111; when the second piston 230 blocks the second valve port 103, the second piston 230 contacts the second stop surface 112.

[0108] In this embodiment, when the first piston 220 blocks the first valve port 102, the first stop surface 111 can stop the first piston 220, preventing the first piston 220 from excessively compressing the first seal 221 and causing the first seal 221 to be damaged or fail. Similarly, when the second piston 230 blocks the second valve port 103, the second stop surface 112 can stop the second piston 230, preventing the second piston 230 from excessively compressing the second seal 231 and causing the second seal 231 to be damaged or fail.

[0109] like Figure 3 As shown, when the piston assembly 200 is in a balanced state, each elastic element is limited to the position between the piston assembly 200 and the valve seat 100. In this embodiment of the application, when the piston assembly 200 is in a balanced state, the first elastic element 310a is limited to the position between the second valve body 140 and the piston rod 210, and the second elastic element 310b is limited to the position between the piston rod 210 and the partition 110.

[0110] In the embodiment, the two elastic members are located between the piston assembly 200 and the valve seat 100, that is, the two elastic members simultaneously axially position the piston assembly 200, so that the piston assembly 200 is prevented from moving due to loosening of at least one of the two elastic members, and noise caused by the piston assembly 200 is avoided. In addition, the two elastic members can ensure that the piston assembly 200 is kept in a balanced state, and the piston assembly 200 is prevented from moving to other positions due to movement of the switch valve as a whole.

[0111] As shown in Figure 3 the embodiment, one end of the first elastic member 310a is in contact with the bottom surface of the guide groove 120, and the other end is in interference fit with the first interference fit part 241 of the first limiting groove 240. One end of the second elastic member 310b is in contact with the partition 110, and the other end is located in the second limiting groove 250.

[0112] In an embodiment, when the piston assembly 200 is in a balanced state, each elastic member is in an original length state or a compressed state.

[0113] When the elastic member is in a compressed state, the compression amount of the elastic member is C, and C≤5mm, for example, C is 1mm, 2mm, 3mm, 4mm or 5mm.

[0114] In the embodiment, when the piston assembly 200 is in a balanced state, each elastic member is in a compressed state, and the compression amount C of the elastic member is ≤5mm, that is, the elastic member is in a micro-compressed state at this time. That is, when the piston assembly 200 is in a balanced state, each elastic member is in a micro-compressed state, so that the service life of the elastic member is not affected due to excessive compression of the elastic member.

[0115] In an embodiment, the first piston 220 and the piston rod 210 can be connected by welding, and the second piston 230 and the piston rod 210 can be connected by interference fit, but are not limited thereto.

[0116] As shown in Figure 3 , the outer periphery of the first piston 220 has a first inclined surface 222 for cooperating with the first valve port 102, and the first inclined surface 222 extends away from the piston rod 210 and the partition 110. The outer periphery of the second piston 230 has a second inclined surface 232 for cooperating with the second valve port 103, and the second inclined surface 232 extends away from the piston rod 210 and the partition 110. The first inclined surface 222 and the second inclined surface 232 can reduce the resistance of fluid flow.

[0117] In an embodiment, the first inclined surface 222 and the second inclined surface 232 are both outer conical surfaces, but are not limited thereto.

[0118]

Second Embodiment

[0119] As Figures 4 to 6 shown, the switching valve of the second embodiment of the present application has the same parts as the switching valve of the first embodiment, and the different parts are as follows:

[0120] The guiding groove 120 has a gas guiding groove 261 on at least one of the groove side wall and the outer peripheral side surface of the guiding section 260, and the gas guiding groove 261 is in communication with the first limiting groove 240 and the valve cavity 101, respectively.

[0121] In the embodiment of the present application, the guiding section 260 and the second valve body 140 are provided with the gas guiding groove 261, and the gas guiding groove 261 is in communication with the first limiting groove 240 and the first valve cavity 101a, respectively. When the piston assembly 200 is switched, the fluid can quickly flow into and out of the first limiting groove 240, thereby reducing the fluid resistance when the piston assembly 200 is switched.

[0122] In an embodiment, the first piston 220 and the piston rod 210 can be connected by injection molding. For example, the first piston 220 is made of plastic material, and the piston rod 210 is made of metal material. The piston rod 210 is a metal insert, and the first piston 220 is integrally injection molded on one end of the piston rod 210. The first piston 220 has a guiding section 260, and the first limiting groove 240 is formed on the guiding section 260.

[0123] In an embodiment, the first opening 151, the second opening 152 and the third opening 153 are all formed on the first valve body 130.

[0124] In the embodiment of the present application, the first valve body 130 can be made of plastic material and formed by injection molding, but is not limited thereto.

[0125] In summary, the switching valve of the embodiment of the present application has at least the following advantages and beneficial effects:

[0126] In the switching valve of the embodiment of the present application, the first piston 220 and the second piston 230 are respectively located on both sides of the partition portion 110 along the axial direction of the piston rod 210, and the elastic assembly 300 is located on one side of the partition portion 110 along the axial direction of the piston rod 210, i.e., the elastic assembly 300 and one of the first piston 220 and the second piston 230 are located on the same side of the partition portion 110. Therefore, when the switching valve is assembled, the piston assembled later is not directly subjected to the reaction force provided by the elastic assembly 300, and the piston assembled later is facilitated to be arranged on the piston rod 210. In addition, since the piston assembled later is not subjected to the reaction force of the elastic assembly 300, the position of the piston assembled later relative to the piston rod 210 is easier to control, and an additional guiding tool is saved, and the assembly difficulty is reduced.

[0127] It can be understood that each embodiment / implementation provided in the present application can be combined with each other without contradiction, which will not be repeated here.

[0128] In the embodiments of the present application, the terms "first", "second", "third" are only used for descriptive purpose and should not be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be interpreted broadly, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0129] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and therefore, cannot be understood as indicating or implying that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, and therefore, cannot be understood as limiting the embodiments of the present application.

[0130] In the description of the present application, the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0131] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A switching valve characterized by comprising: The utility model relates to a valve seat, a piston assembly and a resilient assembly, and relates to a valve. The valve seat has a valve cavity, which comprises a first valve cavity and a second valve cavity connected in communication. The piston assembly is movably arranged in the valve cavity, and comprises a piston rod, a first piston and a second piston. The first piston is connected to the piston rod and moves in the first valve cavity. The second piston is connected to the piston rod and moves in the second valve cavity.

2. The switching valve according to claim 1, characterized by The resilient assembly is connected to the piston assembly, and is arranged in the first valve cavity and not arranged in the second valve cavity.

3. The switching valve according to claim 2, characterized by The resilient assembly is used to balance the piston assembly.

4. The switching valve according to claim 2, characterized by The balance state means that the piston assembly is kept stationary relative to the valve seat under no fluid impact. The resilient assembly comprises two elastic members.

5. The switching valve according to claim 4, characterized by Both of the elastic members are connected to the piston assembly and arranged in the first valve cavity.

6. The switching valve of claim 4, wherein When the piston assembly is in the balance state, each of the elastic members is limited between the piston assembly and the valve seat.

7. The switching valve of claim 4, wherein Each of the elastic members is in an original length state or a compressed state.

8. The switching valve of claim 2, wherein When both of the elastic members are in the compressed state, the elastic force provided by the two elastic members to the piston assembly is in opposite directions. One of the two elastic members is defined as a first elastic member.

9. The switching valve of claim 8, wherein The piston assembly has a first limiting groove. At least a part of the first elastic member is arranged in the first limiting groove.

10. The switching valve of claim 8, wherein The groove wall of the first limiting groove has a first interference fit part.

11. The switching valve of claim 8, wherein The first elastic member is interference fit with the first interference fit part. The inner wall surface of the valve cavity has a second valve port. The second piston is used to open or block the second valve port. When the second valve port is in the open state, the top of the first elastic member has a gap with the valve seat. The piston rod has a guide section. The first limiting groove is arranged at the end of the guide section. The two ends of the first elastic member are respectively in abutment with the bottom wall of the first limiting groove and the valve seat. The other of the two elastic members is defined as a second elastic member. The piston assembly has a second limiting groove. At least a part of the second elastic member is arranged in the second limiting groove. The inner wall surface of the valve cavity is provided with a partition. The first piston is sleeved on the outer circumferential surface of the piston rod. The second limiting groove is formed by the first piston and the piston rod. The opening of the second limiting groove faces the partition. The second elastic member is sleeved on the outer periphery of the part of the piston rod surrounded by the second limiting groove. The two ends of the second elastic member are respectively in abutment with the bottom wall of the second limiting groove and the valve seat. The groove wall of the second limiting groove has a second interference fit part. The second elastic member is interference fit with the second interference fit part. The inner wall surface of the valve cavity is provided with a partition. The inner wall surface of the valve cavity has a first valve port. The first piston is used to open or block the first valve port. When the first valve port is in the open state, the bottom of the second elastic member has a gap with the partition.

12. The switching valve of claim 1, wherein The valve seat has a guide groove, the piston assembly has a guide section, the guide section is arranged in the guide groove, and the outer circumferential side of the guide section is in guiding cooperation with the groove side wall of the guide groove.

13. The switching valve of claim 12, wherein The elastic assembly comprises two elastic members, both of which are connected to the piston assembly, and the guide section has a first limiting groove for accommodating one of the elastic members. The groove side wall of the guide groove and the outer circumferential side of the guide section have at least one air guide groove, which respectively communicates with the first limiting groove and the first valve cavity.

14. The switching valve of claim 1, wherein The inner wall surface of the first valve cavity has a first valve port, the inner wall surface of the second valve cavity has a second valve port, the first piston has a first sealing member for opening or blocking the first valve port, and the second piston has a second sealing member for opening or blocking the second valve port. The inner wall surface of the valve cavity is provided with a partition, the first valve cavity and the second valve cavity are respectively located on both sides of the partition, and the partition has a first stop surface and a second stop surface on both sides along the axial direction of the piston rod. When the first sealing member of the first piston blocks the first valve port, the first piston is in contact with the first stop surface, and when the second sealing member of the second piston blocks the second valve port, the second piston is in contact with the second stop surface.

15. The switching valve of claim 14, wherein The partition has a guide hole, the piston rod movably penetrates the guide hole, and the piston rod is in guiding cooperation with the hole wall of the guide hole.

16. The switching valve of claim 2, wherein When the piston assembly is in a balanced state, the lengths of the two elastic members along the axial direction of the valve are equal.

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