Low-noise slow-closing check valve

Abstract

The utility model relates to the technical field of check valves, in particular to a low-noise slow-closing check valve, which comprises a valve body, a plugging mechanism, a water inlet pipe, a water outlet pipe and a buffer mechanism, the valve body is provided with a water inlet and a water outlet, the water inlet pipe is communicated with the valve body through the water inlet, and the water outlet pipe is communicated with the valve body through the water outlet. The blocking mechanism is arranged in the valve body and used for blocking the water inlet pipe, the buffer mechanism comprises a shell, a piston rod, a piston piece and a communicating pipe, a first connecting port is formed in the shell, a second connecting port is formed in the water inlet pipe, one end of the communicating pipe communicates with the shell through the first connecting port, and the other end of the communicating pipe communicates with the water inlet pipe through the second connecting port; the piston piece is slidably connected into the shell, the piston rod penetrates through the shell to be connected with the piston piece, and the end, away from the piston piece, of the piston rod abuts against the plugging mechanism. According to the check valve, the buffering mechanism is arranged, the buffering effect can be achieved on the plugging mechanism when the check valve is closed, and the service life of the check valve is prolonged.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of air conditioners, and in particular to a low-noise slow-closing check valve. BACKGROUND

[0002] A check valve is also called a non-return valve, which functions to prevent the backflow of medium in a pipeline. The opening and closing element is opened or closed by the medium flow and force to prevent the backflow of the medium. The check valve belongs to the automatic valve type and is mainly used in the pipeline for unidirectional flow of the medium, allowing the medium to flow in only one direction to prevent accidents. The valve of this type should be installed horizontally in the pipeline. At present, the Chinese utility model patent application with the publication date of September 22, 2023 and the publication number of CN219734316U proposes a check valve, which comprises a first valve body and a second valve body connected together, the first valve body and the second valve body are internally hollow, and a first channel, a check valve cavity and a second channel are sequentially arranged along an axis to form a fluid channel, and a mounting seat is arranged in the hollow structure of the first valve body; a valve disc is hingedly arranged with the mounting seat; the valve disc comprises a valve disc and a connecting arm arranged on one side of the valve disc and hingedly connected with the mounting seat, the side wall of the first channel extends out of the valve seat towards the check valve cavity, the valve disc is provided with a convex ring embedded in the through hole of the valve seat, the rear surface of the valve disc is convex to form a spherical arc surface along the flow direction, and a plurality of rib plates are arranged on the rear surface of the connecting arm connected with the valve disc, thereby reducing the vibration and resonance risk caused by the arm length, the outer edges of the plurality of rib plates are in an arc structure and are tangent to the spherical arc surface of the valve disc, thereby reducing the stress at the node, increasing the rigidity and stability of the valve disc, and increasing the swing stability.

[0003] In the related art, the valve disc of the check valve will quickly close when suddenly subjected to a larger reverse pressure from the liquid, which will generate a larger impact force on the valve body and produce noise, and long-term use will accelerate the damage speed of the valve disc and the valve body, thereby reducing the service life of the check valve. CONTENT OF THE UTILITY MODEL

[0004] The low-noise slow-closing check valve provided by the application embodiment can improve the technical problem of a larger impact force generated between the valve disc and the valve body when the valve disc quickly closes in the related art.

[0005] The embodiment of the present application provides a low-noise slow-closing check valve, which comprises a valve body, a plugging mechanism, a water inlet pipe, a water outlet pipe and a buffer mechanism, the valve body is provided with a water inlet and a water outlet, the water inlet pipe is communicated with the valve body through the water inlet, the water outlet pipe is communicated with the valve body through the water outlet, the plugging mechanism is arranged in the valve body and used for plugging the water inlet pipe, the buffer mechanism comprises a shell, a piston rod, a piston sheet and a communication pipe, the shell is provided with a first connecting port, the water inlet pipe is provided with a second connecting port, one end of the communication pipe is communicated with the shell through the first connecting port, the other end of the communication pipe is communicated with the water inlet pipe through the second connecting port, the piston sheet is slidably connected in the shell, the piston rod passes through the shell and is connected with the piston sheet, and one end of the piston rod, away from the piston sheet, is abutted with the plugging mechanism.

[0006] The technical scheme has at least the following technical effects: when liquid enters the valve body through the water inlet pipe, part of the liquid flows into the buffer mechanism through the communication pipe, the piston sheet pushes the piston rod to move towards the valve body under the action of liquid pressure, the plugging mechanism is opened under the joint action of water pressure of the water inlet pipe and the pushing force of the piston rod, the check valve is in an open state, liquid flows into the check valve and flows out through the water outlet pipe; when the liquid pressure decreases or backflows, the plugging mechanism is closed under the action of liquid reverse pressure and gravity, the plugging mechanism first contacts the piston rod extending from the buffer mechanism, and the liquid in the buffer mechanism is extruded out of the buffer mechanism through the communication pipe by the work of the piston sheet on the liquid in the buffer mechanism, in this process, the buffer mechanism slows down the closing speed of the plugging mechanism, plays a role of slow closing of the plugging mechanism, and can protect the plugging mechanism and the valve body.

[0007] The low-noise slow-closing check valve provided by the embodiment of the present application can slow down the closing speed of the plugging mechanism through the buffer mechanism, so as to protect the plugging mechanism and the valve body and reduce the noise generated when the check valve is used.

[0008] In some embodiments, the buffer mechanism further comprises a pull rod, a sealing ring and a handle, one end of the shell, away from the plugging mechanism, is provided with a through hole, the sealing ring is clamped on the through hole, the pull rod passes through the sealing ring and is connected with the piston sheet, and the handle is arranged on one end of the pull rod, away from the piston sheet.

[0009] In some embodiments, the buffer mechanism further comprises a limiting ring, and the limiting ring is arranged in the shell.

[0010] In some embodiments, the blocking mechanism comprises a blocking plate, a connecting rod, a rotating shaft and a rotating ring, the rotating ring is arranged inside the valve body and connected with the inner wall of the valve body, one end of the connecting rod is connected with the rotating shaft, the other end of the connecting rod is connected with the blocking plate, the blocking plate blocks one end of the water inlet pipe inside the valve body, and the rotating shaft is rotationally connected with the rotating ring.

[0011] In some embodiments, the blocking plate is provided with a buffer gasket on one side close to the water inlet pipe.

[0012] In some embodiments, the valve body top is further movably connected with an observation cover.

[0013] In some embodiments, the water inlet pipe is provided with a flange plate at the end away from the valve body, and the water outlet pipe is also provided with a flange plate at the end away from the valve body. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0015] Figure 1 A general structure schematic diagram of a low-noise slow-closing check valve is provided for the embodiments of the present application.

[0016] Figure 2 A general sectional view of a low-noise slow-closing check valve is provided for the embodiments of the present application.

[0017] Figure 3 A general structure schematic diagram of a low-noise slow-closing check valve is provided for the embodiments of the present application. Figure 2 An enlarged schematic diagram of part A.

[0018] Figure 4 A buffer mechanism sectional view of a low-noise slow-closing check valve is provided for the embodiments of the present application.

[0019] In the drawings, various reference signs represent:

[0020] 1, valve body; 11, observation cover; 21, blocking plate; 211, buffer gasket; 22, connecting rod; 23, rotating shaft; 24, rotating ring; 3, water inlet pipe; 4, water outlet pipe; 51, outer shell; 52, piston rod; 53, piston sheet; 54, communication pipe; 55, pull rod; 56, sealing ring; 57, handle; 58, limiting ring; 6, flange plate. DETAILED DESCRIPTION

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0022] Unless otherwise defined, 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 herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0027] It should be noted that the terms "in some embodiments," "exemplary," "for example," and the like are used herein not to limit the scope of what can be claimed after the application is filed, but to delineate various embodiments and features of the application, and that some embodiments can be quite distinct from other embodiments. Terms such as "in some embodiments," "exemplary," "for example," and the like, where they occur at the beginning of a sentence, are to be construed as applying to the sentence even when it refers to alternative embodiments as a whole. Where such terms occur in the middle or latter parts of a sentence, they should not be construed as applying to only one alternative, the entire list of alternatives or the list as a whole, but should be construed as applying to that member of the alternative that has already been introduced in the same sentence where the

[0028] Check valve, also known as back check valve, its function is to prevent the medium in the pipeline backflow. The opening and closing member is opened or closed by the medium flow and force to prevent the medium backflow. Check valve belongs to automatic valve, mainly used in the pipeline of the medium unidirectional flow, only allows the medium to flow in one direction, to prevent accidents. This kind of valve should be installed horizontally in the pipeline.

[0029] In the related art, the valve disc of the check valve will quickly close when suddenly subjected to a larger reverse pressure from the liquid, which will generate a larger impact force on the valve body and produce noise. Long-term use will accelerate the damage speed of the valve disc and the valve body, reducing the service life of the check valve.

[0030] Based on this, to improve the problems in the related art, the embodiments of the present application provide the following solutions.

[0031] Please refer to Figures 1 to 4 The embodiments of the present application provide a low-noise slow-closing check valve, which comprises a valve body 1, a plugging mechanism, a water inlet pipe 3, a water outlet pipe 4 and a buffer mechanism. The valve body 1 is provided with a water inlet and a water outlet. The water inlet pipe 3 communicates with the valve body 1 through the water inlet, and the water outlet pipe 4 communicates with the valve body 1 through the water outlet. The plugging mechanism is arranged in the valve body 1 and is used for plugging the water inlet pipe 3. The buffer mechanism comprises an outer shell 51, a piston rod 52, a piston sheet 53 and a communication pipe 54. The outer shell 51 is provided with a first connecting port, and the water inlet pipe 3 is provided with a second connecting port. One end of the communication pipe 54 communicates with the outer shell 51 through the first connecting port, and the other end of the communication pipe 54 communicates with the water inlet pipe 3 through the second connecting port. The piston sheet 53 is slidably connected in the outer shell 51, the piston rod 52 is connected with the piston sheet 53 through the outer shell 51, and the end of the piston rod 52 away from the piston sheet 53 abuts against the plugging mechanism.

[0032] From the above, the low-noise slow-closing check valve provided by the embodiment of the application is provided with a buffer mechanism, when liquid enters the valve body 1 through the water inlet pipe 3, part of the liquid flows into the buffer mechanism through the connecting pipe 54, the piston rod 52 is pushed to move into the valve body 1 under the action of the liquid pressure, the blocking mechanism is opened under the joint action of the water pressure of the water inlet pipe 3 and the pushing force of the piston rod 52, the check valve is in an open state, the liquid flows into the check valve and flows out through the water outlet pipe 4; when the liquid pressure decreases or backflows, the blocking mechanism is closed under the action of the reverse liquid pressure and its own gravity, the blocking mechanism will first contact the piston rod 52 extending from the buffer mechanism, and the liquid in the buffer mechanism is extruded out of the buffer mechanism through the connecting pipe 54 by the working of the piston sheet 53 on the liquid in the buffer mechanism, in this process, the buffer mechanism slows down the closing speed of the blocking mechanism, plays a role of slow closing of the blocking mechanism, and can protect the blocking mechanism and the valve body 1.

[0033] In some embodiments, referring to Figures 1 to 4 , the buffer mechanism further comprises a pull rod 55, a sealing ring 56 and a handle 57, a through hole is formed in the end of the shell 51 away from the blocking mechanism, the sealing ring 56 is clamped on the through hole, the pull rod 55 passes through the sealing ring 56 and is connected with the piston sheet 53, and the handle 57 is arranged on the end of the pull rod 55 away from the piston sheet 53.

[0034] In this way, when the blocking mechanism is closed, if the blocking mechanism cannot be normally closed due to insufficient reverse liquid pressure or blockage of foreign matters in the buffer mechanism, the piston rod 52 can be manually pulled back by the pull rod 55 with the help of human force to make the blocking mechanism closed, the sealing ring 56 is used to prevent liquid from leaking from the gap between the pull rod 55 and the shell 51, and the handle 57 is used to more conveniently pull the pull rod 55.

[0035] Optionally, in some embodiments, referring to 4, the buffer mechanism further comprises a limiting ring 58, and the limiting ring 58 is arranged in the shell 51.

[0036] In this way, the probability that the piston sheet 53 moves to abut against the sealing ring 56 to make the piston sheet 53 block the first connecting port can be reduced.

[0037] Optionally, referring to Figure 2 and Figure 3 , the blocking mechanism comprises a blocking plate 21, a connecting rod 22, a rotating shaft 23 and a rotating ring 24, the rotating ring 24 is arranged in the valve body 1 and connected with the inner wall of the valve body 1, one end of the connecting rod 22 is connected with the rotating shaft 23, the other end of the connecting rod 22 is connected with the blocking plate 21, the blocking plate 21 blocks the end of the water inlet pipe 3 in the valve body 1, and the rotating shaft 23 is rotationally connected with the rotating ring 24.

[0038] Thus, when the check valve is opened due to water pressure, the blocking plate 21 can drive the connecting rod 22 to rotate around the rotating shaft 23, and the liquid can enter the valve body 1 through the water inlet pipe 3. When the check valve is closed, the blocking plate 21 drives the connecting rod 22 to rotate around the rotating shaft 23 under the action of the reverse pressure of the liquid and its own gravity, blocks the water inlet pipe 3, and prevents the liquid from flowing back.

[0039] In some embodiments, referring to Figure 2 and Figure 3 , the side of the blocking plate 21 close to the water inlet pipe 3 is provided with a buffer gasket 211.

[0040] Thus, when the blocking plate 21 is suddenly closed under a large reverse pressure, the buffer gasket 211 can buffer the impact force when the blocking plate 21 contacts the water inlet pipe 3, thereby protecting the blocking plate 21 and the pipe opening of the water inlet pipe 3. Meanwhile, the buffer gasket 211 can effectively reduce the noise generated when the blocking plate 21 collides with the water inlet pipe 3, thereby achieving a mute effect.

[0041] Optionally, in some embodiments, referring to Figure 1 and Figure 2 , the valve body 1 is further movably connected with an observation cover 11.

[0042] Thus, when the check valve needs to be repaired or fails after long-term use, the observation cover 11 can be opened to observe the internal condition of the check valve, and the internal maintenance work of the check valve can be performed.

[0043] Optionally, referring to Figures 1 to 2 , the end of the water inlet pipe 3 away from the valve body 1 and the end of the water outlet pipe 4 away from the valve body 1 are both provided with a flange plate 6.

[0044] Thus, the flange plate 6 facilitates the connection and disassembly of the check valve and the external pipeline.

[0045] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A low-noise slow-closing check valve, characterized in that: The system includes a valve body (1), a sealing mechanism, an inlet pipe (3), an outlet pipe (4), and a buffer mechanism. The valve body (1) has an inlet and an outlet. The inlet pipe (3) is connected to the valve body (1) through the inlet, and the outlet pipe (4) is connected to the valve body (1) through the outlet. The sealing mechanism is located inside the valve body (1) and is used to seal the inlet pipe (3). The buffer mechanism includes a housing (51), a piston rod (52), a piston plate (53), and a connecting pipe (54). (51) has a first connection port, and the water inlet pipe (3) has a second connection port. One end of the connecting pipe (54) is connected to the outer shell (51) through the first connection port, and the other end of the connecting pipe (54) is connected to the water inlet pipe (3) through the second connection port. The piston plate (53) is slidably connected in the outer shell (51). The piston rod (52) passes through the outer shell (51) and is connected to the piston plate (53). The end of the piston rod (52) away from the piston plate (53) abuts against the sealing mechanism.

2. The low-noise slow-closing check valve according to claim 1, characterized in that: The buffer mechanism also includes a pull rod (55), a sealing ring (56), and a handle (57). The outer shell (51) has a through hole at the end away from the sealing mechanism. The sealing ring (56) is engaged in the through hole. The pull rod (55) passes through the sealing ring (56) and is connected to the piston plate (53). The handle (57) is located at the end of the pull rod (55) away from the piston plate (53).

3. The low-noise slow-closing check valve according to claim 2, characterized in that: The buffer mechanism also includes a limiting ring (58), which is disposed inside the housing (51).

4. A low-noise slow-closing check valve according to any one of claims 1-3, characterized in that: The sealing mechanism includes a sealing plate (21), a connecting rod (22), a rotating shaft (23), and a rotating ring (24). The rotating ring (24) is located inside the valve body (1) and connected to the inner wall of the valve body (1). One end of the connecting rod (22) is connected to the rotating shaft (23), and the other end of the connecting rod (22) is connected to the sealing plate (21). The sealing plate (21) seals the end of the water inlet pipe (3) inside the valve body (1). The rotating shaft (23) and the rotating ring (24) are rotatably connected.

5. A low-noise slow-closing check valve according to claim 4, characterized in that: The sealing plate (21) is provided with a buffer pad (211) on the side near the water inlet pipe (3).

6. A low-noise slow-closing check valve according to claim 5, characterized in that: An observation cover (11) is also movably connected to the top of the valve body (1).

7. A low-noise slow-closing check valve according to claim 6, characterized in that: A flange (6) is provided at the end of the water inlet pipe (3) away from the valve body (1) and at the end of the water outlet pipe (4) away from the valve body (1).

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