check valve

Abstract

The application provides a check valve, belonging to the technical field of valves. The check valve comprises a valve body and an on-off assembly. The valve body is internally provided with a first channel and a second channel in communication. The second channel comprises at least two sub-channels arranged in separation. Each sub-channel is in communication with the first channel. At least one of the sub-channels is internally provided with a buffer. The buffer is configured to buffer the pressure of the fluid flowing therethrough. The on-off assembly comprises a valve core and an elastic member. The elastic member is configured to drive the valve core to slide from an open state to a closed state. In the check valve, part of the fluid flows through the sub-channel provided with the buffer, and is buffered by the buffer. Another part of the fluid flows through the sub-channel without the buffer. The pressure of the fluid flowing out of all the sub-channels is reduced. The impact force of the fluid acting on the valve core is reduced. The speed of the valve core sliding from the open state to the closed state is slowed down. The deformation of the elastic member is more gradual. Therefore, the service life of the check valve is prolonged.

Description

Technical Field

[0001] This application relates to the field of valve technology, and more particularly to a check valve. Background Technology

[0002] Valves are control components in fluid transport systems. There are many types of valves. Check valves, also known as non-return valves, one-way valves, backflow valves, or isolation valves, are among the most widely used valves. They are characterized by fast response, efficient backflow prevention, and high reliability.

[0003] A check valve consists of a valve body, a valve core, and an elastic element (such as a spring) housed within the valve body. The check valve opens by the valve core, driven by fluid pressure, overcoming the force of the elastic element, allowing fluid to flow smoothly through the valve. Conversely, when the fluid flow rate decreases or stops, or when the fluid flows in reverse, the valve core closes the valve body under the action of the elastic element.

[0004] However, when the fluid pressure fluctuates greatly during the use of a check valve, the valve core moves rapidly between the open and closed states, which can easily lead to fatigue failure of the valve core and elastic components, resulting in a shorter service life for the check valve. Utility Model Content

[0005] A check valve is provided to solve the problem of short service life caused by fatigue failure of the valve core and elastic components.

[0006] This application provides a check valve, comprising:

[0007] The valve body has a first channel and a second channel that are connected to each other. The second channel includes at least two separate sub-channels. Each sub-channel is connected to the first channel. At least one of the sub-channels is provided with a buffer element, which is configured to buffer the pressure of the fluid flowing through it.

[0008] An on / off assembly includes a valve core and an elastic element. The valve core is slidably disposed within the first channel and has an open state that connects to the first channel and a closed state that disconnects from the first channel. One end of the elastic element is connected to the valve core, and the other end of the elastic element is connected to the valve body. The elastic element is configured to drive the valve core to slide from the open state to the closed state.

[0009] In some possible embodiments, the valve body includes an inlet pipe, in which at least two branch channels are formed, and at least one of the branch channels on the inlet pipe is provided with at least one protrusion, and the protrusion is provided with a groove communicating with the branch channel;

[0010] The buffer includes at least one buffer plate, which is disposed in the sub-channel and divides the sub-channel into a first sub-channel and a second sub-channel. The groove connects the first sub-channel and the second sub-channel.

[0011] In some possible implementations, the buffer plate extends into the groove to divide the groove into at least two communicating slots.

[0012] In some possible implementations, the buffer plate is connected to the bottom of the groove, and the buffer plate has a plurality of through holes corresponding to the groove and connecting two adjacent grooves.

[0013] In some possible implementations, the valve body includes at least one partition plate, the inlet pipe surrounds the second channel, and the partition plate is disposed axially within the inlet pipe to divide the second channel into at least two sub-channels.

[0014] In some possible implementations, a guide element is also included;

[0015] The guide is connected to the valve core and is used to guide the valve core to slide axially along the first channel.

[0016] In some possible implementations, the guide includes a connector and a guide body;

[0017] The connector is connected to the valve core, and at least two guides are disposed opposite to each other on the connector. The two guides are used to connect with the inner wall of the first channel and guide the valve core to slide.

[0018] In some possible implementations, a fairing is also included;

[0019] The flow guide is disposed in the first channel and is located on the side of the valve core facing the second channel. The outer periphery of the flow guide has a flow guiding surface, which is used to guide the fluid flowing out of each of the sub-channels to flow to the outer periphery of the valve core.

[0020] In some possible implementations, at least two connectors are also included;

[0021] The connectors are spaced apart on the circumference of the flow guide, and the flow guide is connected to the inner wall of the first channel through the connectors.

[0022] In some possible implementations, the flow guide is provided with a mounting portion on the side facing the valve core, the mounting portion being used to connect to one end of the elastic member.

[0023] The check valve provided in this application, by setting at least two branch channels within the second channel, and at least one of the branch channels containing a buffer, ensures that when fluid flows from the second channel to the first channel, a portion of the fluid flows through the branch channel with the buffer, where it is pressure-reduced and buffered, while the other portion flows through the branch channel without the buffer. The pressure of the fluid flowing out of all branch channels after converging in the first channel is reduced. The impact force of the buffered and pressure-reduced fluid on the valve core is reduced, and the speed at which the valve core slides from the open to the closed state slows down until it reaches the closed position, preventing fluid from flowing back out of the first channel. The slower sliding speed of the valve core makes the deformation process of the elastic element smoother, which helps avoid fatigue failure of the valve core and elastic element when the fluid pressure is too high or fluctuates frequently, thus extending the service life of the check valve. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the internal structure of the check valve described in the embodiments of this application;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure inside the inlet pipe.

[0027] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments.

[0028] Explanation of reference numerals in the attached figures

[0029] 100: Valve body; 110: First channel; 120: Second channel; 130: Sub-channel; 131: First sub-channel; 132: Second sub-channel; 140: Buffer; 141: Through hole; 150: Inlet pipe; 160: Protrusion; 161: Groove; 1611: Dividing groove; 1611A: First dividing groove; 1611B: Second dividing groove; 170: Dividing plate; 180: First pipe; 181: First section; 190: Second pipe; 191: Second section;

[0030] 200: On / off assembly; 210: Valve core; 220: Elastic element;

[0031] 300: Guide component; 310: Connector; 320: Guide body;

[0032] 400: Shield; 410: Surface guide; 420: Connector; 430: Mounting part.

[0033] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] The terms "first," "second," "third," "fourth," etc., used in this application's specification and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0038] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0039] Check valves in the prior art are also called non-return valves, one-way valves, reflux valves, or isolation valves. The main structure of a check valve includes a valve body 100, a valve core 210, and a resilient element 220. The valve body 100 has an internal fluid passage (connecting the inlet and outlet sides), which serves as the carrier for fluid flow and the mounting base for components such as the valve core 210 and the resilient element 220. The valve core 210 can slide or rotate within the valve body 100 in both open and closed states, and is a key component for controlling the flow. One end of the resilient element 220 is connected to the valve core 210, and the other end is connected to the valve body 100. Its own elasticity provides the driving force for closing the passage to the valve core 210.

[0040] The opening and closing of the check valve is entirely controlled by the balance between fluid pressure and the elastic force of the elastic element 220, requiring no external power. When fluid flows from the inlet side (high-pressure side) to the outlet side (low-pressure side) of the check valve, the check valve is in the open state. The fluid pressure acts on the valve core 210, forming a force that pushes the valve core 210 towards the outlet side. When this pressure is greater than the elastic force of the elastic element 220, the valve core 210 is pushed open, and the passage inside the valve body 100 is opened. The fluid can flow smoothly from the inlet side to the outlet side through the gap (or preset flow channel) between the valve core 210 and the valve body 100. At this time, the elastic element 220 is compressed (or stretched), storing elastic potential energy.

[0041] When the fluid flow state changes (e.g., the forward flow velocity decreases, stops, or a reverse flow trend appears): the fluid pressure on the inlet side decreases, and the thrust acting on the valve core 210 decreases. The elastic force of the elastic element 220 gradually becomes dominant, pushing the valve core 210 to move towards the inlet side; finally, the valve core 210 and the sealing surface of the valve body 100 are tightly fitted, completely blocking the passage and preventing fluid from flowing back from the outlet side to the inlet side. At this time, the check valve is in the closed state.

[0042] When the fluid pressure fluctuates greatly during the use of the check valve, the valve core 210 moves rapidly between the open and closed states, which can easily lead to fatigue failure of the valve core 210 and the elastic element 220, resulting in a short service life of the check valve.

[0043] Based on the above-mentioned technical problems, this application provides a check valve. The structure of the cable is described below with reference to the accompanying drawings.

[0044] Reference Figure 1As shown in the figure, an embodiment of this application provides a check valve, including a valve body 100, an on / off assembly 200, and an elastic element 220.

[0045] The valve body 100 is provided with a first channel 110 and a second channel 120 connected in a manner. The second channel 120 includes at least two separate sub-channels 130, each of which is connected to the first channel 110. At least one of the sub-channels 130 is provided with a buffer 140, which is configured to buffer the pressure of the fluid flowing through it.

[0046] The valve includes a valve core 210 and an elastic element 220. The valve core 210 is slidably disposed in the first channel 110. The valve core 210 has an open state that connects to the first channel 110 and a closed state that disconnects from the first channel 110. One end of the elastic element 220 is connected to the valve core 210, and the other end of the elastic element 220 is connected to the valve body 100. The elastic element 220 is configured to drive the valve core 210 to slide from the open state to the closed state.

[0047] The check valve provided in this application, by providing at least two branch channels 130 within the second channel 120, and at least one of the branch channels 130 containing a buffer element 140, allows fluid to flow from the second channel 120 to the first channel 110. A portion of the fluid flows through the branch channel with the buffer element 140, where it is pressure-reduced and buffered. The other portion flows through the branch channel without the buffer element 140. The pressure of the fluid flowing out of all branch channels 130 after converging in the first channel 110 is reduced. This reduces the impact force of the buffered and pressure-reduced fluid on the valve core 210, slowing the sliding speed of the valve core 210 from the open to the closed state until it reaches the closed position, preventing fluid from flowing back out of the first channel 110. The slower sliding speed of the valve core 210 also makes the deformation process of the elastic element 220 smoother, helping to avoid fatigue failure of the valve core 210 and elastic element 220 when the fluid pressure is too high or fluctuates frequently, thus extending the service life of the check valve.

[0048] In some possible implementations, such as Figure 1 As shown, the valve body 100 includes an inlet pipe 150, within which at least two branch channels 130 are formed. At least one protrusion 160 is provided in at least one branch channel 130 of the inlet pipe 150, and a groove 161 communicating with the branch channel 130 is provided on the protrusion 160. The buffer member 140 includes at least one buffer plate, which is correspondingly disposed within the branch channel 130 and divides the branch channel 130 into a first sub-channel 131 and a second sub-channel 132. The groove 161 connects the first sub-channel 131 and the second sub-channel 132.

[0049] Here, by providing at least one protrusion 160 within at least one of the sub-channels 130, and by providing a groove 161 on the protrusion 160, the structure of the groove 161 facilitates the buffering effect on the fluid pressure within the sub-channel 130. Furthermore, a buffer plate is disposed within the sub-channel 130 with the groove 161. The buffer plate divides the sub-channel 130 into a first sub-channel 131 and a second sub-channel 132, ensuring that the fluid flowing through the sub-channel 130 must pass through the buffer plate and is further buffered and depressurized by the buffer plate.

[0050] In this embodiment, the sub-channel 130 with groove 161 and buffer plate reduces fluid pressure, while the sub-channel 130 without groove 161 and buffer plate ensures fluid flow. The combination of multiple sub-channels 130 helps to balance fluid delivery efficiency and pressure stability.

[0051] It should be noted that the number of grooves 161 and buffer plates is, in addition to being, Figure 1 In addition to the one shown, there may be multiple grooves 161 and buffer plates spaced axially along the channel 130. The number of grooves 161 and buffer plates can be adjusted adaptively according to the usage requirements.

[0052] like Figure 1 and Figure 2 As shown, the buffer plate extends into the groove 161 to divide the groove 161 into at least two communicating sub-grooves 1611. This arrangement helps to further improve the pressure reduction and buffering effect of the buffer plate on the fluid.

[0053] For ease of description, along the direction of fluid flow from the second channel 120 to the first channel 110, the first sub-channel 131 is located upstream of the buffer plate, and the second sub-channel 132 is located downstream of the buffer plate. The branch channel 1611 connected to the first sub-channel 131 is referred to as the first branch channel 1611A, and the branch channel 1611 connected to the second sub-channel 132 is referred to as the second branch channel 1611B. Clearly, the first branch channel 1611A is located upstream of the buffer plate, and the second branch channel 1611B is located downstream of the buffer plate.

[0054] In some possible implementations, the buffer plate is connected to the bottom of the groove 161. The buffer plate has multiple through holes 141, which correspond to the groove 161 and connect two adjacent sub-grooves 1611. This arrangement ensures that fluid in the first sub-grooves 1611A can only flow into the second sub-grooves 1611B through the multiple through holes 141. Because the flow area of ​​the through holes 141 is small, it helps to reduce the fluid velocity and pressure, thereby buffering the fluid.

[0055] In practice, the through holes 141 are located at the bottom of the groove 161 of the buffer plate, which helps to further improve the pressure reduction and buffering effect of the buffer plate on the fluid. The number and cross-sectional area of ​​the through holes 141 can be determined according to the usage requirements.

[0056] In addition, the buffer plate can be installed at an angle or vertically within the sub-channel 130. The top of the buffer plate acts as a flow barrier, while the bottom acts as a flow channel, resulting in a longer fluid flow path and better buffering effect. When two or more buffer plates are arranged, the fluid can be buffered and depressurized in stages through multiple buffer plates.

[0057] In some possible implementations, such as Figure 1 As shown, the valve body 100 includes at least one partition plate 170. The inlet pipe 150 forms a second channel 120. The partition plate 170 is disposed within the inlet pipe 150 along its axial direction to divide the second channel 120 into at least two sub-channels 130. The partition plate 170 facilitates the division of the second channel 120 into sub-channels 130, and its structure is simple and easy to form. In specific implementations, the shape and number of partition plates 170 can be adapted and adjusted according to usage requirements.

[0058] Continue to refer to Figure 1 As shown, the valve body 100 also includes a first pipe 180 and a second pipe 190 connected in a manner. The first channel 110 includes a first section 181 and a second section 191 connected in a manner. The first section 181 is located inside the first pipe 180, and the second section 191 is located inside the second pipe 190. The cross-sectional area of ​​the first section 181 is smaller than that of the second section 191, and a communication port is formed at the connection between the first section 181 and the second section 191. The second section 191 is connected to the inlet pipe 150. The valve core 210 and the elastic element 220 are both located inside the second section 191. The valve core 210 is used to open or close the communication port.

[0059] Here, the second segment 191, which has a larger cross-sectional area, is connected to the second channel 120, which can reduce the flow velocity of the fluid in the second segment 191, thereby also helping to reduce the pressure of the fluid in the second segment 191.

[0060] The check valve in this embodiment further includes a guide 300, which is connected to the valve core 210 and is used to guide the valve core 210 to slide axially along the first channel 110. By providing the guide 300, the stability of the valve core 210 during sliding is improved, and problems such as tilting, offsetting, and jamming of the valve core 210 are prevented, thereby ensuring the performance of the check valve.

[0061] As a structural example of guide member 300, such as Figure 1As shown, the guide member 300 includes a connecting body 310 and guide bodies 320. The connecting body 310 is connected to the valve core 210, and at least two guide bodies 320 are disposed opposite each other on the connecting body 310. The two guide bodies 320 are used to connect with the inner wall of the first channel 110 and guide the valve core 210 to slide. Here, the connecting body 310 facilitates the connection between the guide member 300 and the valve core 210, and the guide bodies 320 facilitate the guiding of the sliding of the valve core 210. Specifically, the guide member 300 is connected to the inner wall of the first tube 180.

[0062] Specifically, the connecting body 310 is a column located on the side of the valve core 210 opposite to the elastic element 220, and the connecting body 310 and the valve core 210 are arranged collinearly. The guide body 320 is a rod, one end of which is connected to the connecting body 310, and the other end abuts against the inner wall of the first channel 110. When the valve core 210 slides, the abutment between the free end of the guide body 320 and the inner wall of the first channel 110 ensures that the valve core 210 moves along its own axial direction, thus having good stability.

[0063] Furthermore, guide grooves (not shown in the figure) corresponding to the free ends of the guide body 320 can be provided on the inner wall of the first segment 181. The extension direction of the guide grooves is consistent with the sliding direction of the valve core 210. The free ends of the guide body 320 are slidably disposed in the guide grooves, which also helps to prevent the valve core 210 from rotating in its own circumferential direction.

[0064] In some possible implementations, such as Figure 1 As shown, the check valve also includes a flow guide shroud 400, which is disposed in the first channel 110. The flow guide shroud 400 is located on the side of the valve core 210 facing the second channel 120. The outer periphery of the flow guide shroud 400 has a flow guide surface 410, which is used to guide the fluid flowing out of each sub-channel 130 to flow to the outer periphery of the valve core 210.

[0065] Here, the fluid is guided to the outer periphery of the valve core 210 by the guide surface 410 of the guide shroud 400, so that the fluid pressure is evenly applied to the circumference of the valve core 210. This helps to further reduce the impact force of the fluid acting on the valve core 210, and also helps to reduce the speed at which the valve core 210 slides from the open state to the closed state. This helps to reduce the deformation speed of the elastic element 220, and thus helps to extend the service life of the valve core 210 and the elastic element 220.

[0066] Furthermore, the guide surface 410 on the guide shield 400 helps to prevent turbulent flow of the fluid within the valve body 100, thereby reducing flow resistance. Simultaneously, the fluid velocity distribution within the first channel 110 is more uniform after guidance, preventing excessively high or low local velocities, thus reducing pressure loss and erosion wear on the valve core 210 caused by uneven flow velocity, and ultimately extending the service life of the check valve.

[0067] In this embodiment, the flow deflector 400 is disposed within the second section 191, and the flow deflector 400 can be oriented... Figure 1 As shown, the cross-sectional area of ​​the guide surface 410 gradually increases along the direction pointing to the valve core 210, so as to ensure that the guide surface 410 guides the fluid to the outer periphery of the valve core 210, thereby further reducing the impact force of the fluid on the valve core 210.

[0068] In some possible implementations, the check valve in this application embodiment further includes at least two connectors 420, which are spaced apart circumferentially on the flow guide 400. The flow guide 400 is connected to the inner wall of the first channel 110 via the connectors 420. The connectors 420 facilitate the installation of the flow guide 400 within the first channel 110.

[0069] In terms of specific structure, the connector 420 can be set on the outer periphery of the end of the flow guide 400 facing the branch channel 130, and the free end of the connector 420 is connected to the inner wall of the first channel 110 in the second pipe 190, so that the flow guide 400 can be installed in the valve body 100.

[0070] In addition, such as Figure 1 As shown, the flow guide 400 has a mounting portion 430 on the side facing the valve core 210, which is used to connect to one end of the elastic member 220. By providing the mounting portion 430, it is convenient to install the elastic member 220, which is specifically a spring, and one end of the spring is connected to the valve body 100 through the flow guide 400.

[0071] The mounting section 430 includes a mounting plate or mounting bracket disposed on the fairing 400. In this case, the mounting plate not only facilitates the installation of the elastic element 220, but also helps to improve the structural strength of the fairing 400. In specific implementations, the structural form of the mounting section 430 can be determined according to the requirements.

[0072] When the check valve switches from the closed state to the open state, the fluid pressure on the side of the valve core 210 facing the first section 181 is greater, which squeezes the valve core 210, causing the elastic element 220 to be compressed and deformed. The valve core 210 slides away from the connection port until the connection port is opened. The fluid in the first section 181 flows into the second section 191 and multiple sub-channels 130 through the connection port and then flows out.

[0073] When the check valve switches from the open state to the closed state, the fluid pressure on the side of the valve core 210 facing the second section 191 is relatively high. Some of the fluid is buffered by the buffer plate and groove 161 in the branch channel 130 before flowing out, while the other part flows directly through the branch channel 130 before flowing out. The overall pressure of all the fluid flowing out of the branch channel 130 is reduced after converging. The pressure-reduced fluid is guided by the guide surface 410 on the guide cover 400 and flows to the outer periphery of the valve core 210, which helps to reduce the impact force acting on the valve core 210, so that the valve core 210 slowly slides from the open state to the closed state. During the process, the elastic element 220 slowly deforms with the valve core 210 until the valve core 210 slides to the closed state and blocks the connection port.

[0074] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only.

[0075] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A check valve, characterized in that, include: A valve body (100) is provided with a first channel (110) and a second channel (120) that are connected to each other. The second channel (120) includes at least two separate sub-channels (130), each of which is connected to the first channel (110). At least one of the sub-channels (130) is provided with a buffer (140), which is configured to buffer the pressure of the fluid flowing through it. An on / off assembly (200) includes a valve core (210) and an elastic element (220). The valve core (210) is slidably disposed within the first channel (110). The valve core (210) has an open state that connects to the first channel (110) and a closed state that disconnects from the first channel (110). One end of the elastic element (220) is connected to the valve core (210), and the other end of the elastic element (220) is connected to the valve body (100). The elastic element (220) is configured to drive the valve core (210) to slide from the open state to the closed state.

2. The check valve according to claim 1, characterized in that, The valve body (100) includes an inlet pipe (150), in which at least two branch channels (130) are formed. At least one of the branch channels (130) on the inlet pipe (150) is provided with at least one protrusion (160), and the protrusion (160) is provided with a groove (161) communicating with the branch channel (130). The buffer (140) includes at least one buffer plate, which is correspondingly disposed in the sub-channel (130) and divides the sub-channel (130) into a first sub-channel (131) and a second sub-channel (132). The groove (161) connects the first sub-channel (131) and the second sub-channel (132).

3. The check valve according to claim 2, characterized in that, The buffer plate extends into the groove (161) to divide the groove (161) into at least two communicating slots (1611).

4. The check valve according to claim 3, characterized in that, The buffer plate is connected to the bottom of the groove (161). The buffer plate has a plurality of through holes (141). The through holes (141) correspond to the groove (161) and the through holes (141) connect two adjacent grooves (1611).

5. The check valve according to claim 2, characterized in that, The valve body (100) includes at least one partition plate (170), the inlet pipe (150) surrounds the second channel (120), and the partition plate (170) is disposed within the inlet pipe (150) along the axial direction of the inlet pipe (150) to divide the second channel (120) into at least two sub-channels (130).

6. The check valve according to any one of claims 1 to 5, characterized in that, It also includes guide components (300); The guide (300) is connected to the valve core (210) and is used to guide the valve core (210) to slide axially along the first channel (110).

7. The check valve according to claim 6, characterized in that, The guide (300) includes a connector (310) and a guide (320); The connector (310) is connected to the valve core (210), and there are at least two guides (320) disposed opposite to each other on the connector (310). The two guides (320) are used to connect with the inner wall of the first channel (110) and guide the valve core (210) to slide.

8. The check valve according to any one of claims 1 to 5, characterized in that, It also includes a fairing (400); The flow guide shroud (400) is disposed in the first channel (110). The flow guide shroud (400) is located on the side of the valve core (210) facing the second channel (120). The outer periphery of the flow guide shroud (400) has a flow guide surface (410), which is used to guide the fluid flowing out of each of the sub-channels (130) to flow to the outer periphery of the valve core (210).

9. The check valve according to claim 8, characterized in that, It also includes at least two connectors (420); The connector (420) is spaced around the circumference of the flow guide (400) on the flow guide (400), and the flow guide (400) is connected to the inner wall of the first channel (110) through the connector (420).

10. The check valve according to claim 8, characterized in that, The flow guide (400) has a mounting part (430) on the side facing the valve core (210), and the mounting part (430) is used to connect to one end of the elastic member (220).

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