Waterproof hammer check valve

Abstract

The utility model relates to the technical field of check valves, and provides a waterproof hammer check valve which comprises a valve body and a valve clack, a medium channel is arranged in the valve body, the waterproof hammer check valve further comprises a piston cylinder, the piston cylinder is arranged in the valve body and fixedly connected with the inner wall of the valve body, a guide cavity and a piston cavity which extend inwards are formed on the front end face and the rear end face of the piston cylinder respectively, and the valve clack is arranged in the guide cavity. A relief hole and a damping hole which are communicated with the outside are formed in the inner wall of the front side of the piston cavity, and the damping hole is located in front of the relief hole; the piston is arranged in the piston cavity and is in sliding connection with the inner wall of the piston cavity, and the piston and the inner wall of the piston cavity are kept sealed; the piston rod is arranged in the guide cavity and is in sliding connection with the inner wall of the guide cavity, the first end of the piston rod is fixedly connected with the piston, the second end of the piston rod is fixedly connected with the valve clack, and when the valve clack closes the medium channel, the damping hole is located in front of the piston and is in an unblocked state, and the release hole is blocked by the piston or located behind the piston.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, specifically to a check valve for preventing water hammer. Background Technology

[0002] A check valve is a valve that automatically opens and closes its disc based on the flow of the medium itself, used to prevent backflow of the medium. Check valves are a type of automatic valve, often used in conjunction with water pumps, and their main function is to prevent backflow of the medium.

[0003] Existing check valves have the following problems during use: During the closing process, the valve disc may close too quickly, causing water hammer, which poses a significant safety hazard to the entire pipeline. Some patents incorporate a buffer structure within the check valve to allow the valve disc to close slowly. While this avoids water hammer, if the valve disc closes slowly throughout its entire stroke, it can lead to significant backflow of the medium due to delayed closure. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a water hammer check valve that enables the valve disc to open slowly when opening, move rapidly when closing, and then close slowly as it approaches closure.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a water hammer check valve, comprising a valve body and a valve disc, wherein the valve body has a media channel inside, and further comprising:

[0006] A piston cylinder is disposed in the valve body and fixedly connected to the inner wall of the valve body. An inwardly extending guide cavity and a piston cavity are formed on the front end face and the rear end face of the piston cylinder, respectively. A vent hole and a damping hole communicating with the outside are opened on the front inner wall of the piston cavity. The damping hole is located in front of the vent hole.

[0007] A piston is disposed within the piston chamber and is slidably connected to the inner wall of the piston chamber, and the piston remains sealed to the inner wall of the piston chamber.

[0008] A piston rod is disposed within the guide cavity and slidably connected to the inner wall of the guide cavity. The first end of the piston rod is fixedly connected to the piston, and the second end of the piston rod is fixedly connected to the valve disc. When the valve disc closes the medium channel, the damping orifice is located in front of the piston and is in a unobstructed state, and the venting orifice is blocked by the piston or located behind the piston.

[0009] Furthermore, a cylinder head is fixedly installed on the rear end face of the piston cylinder, and a plurality of one-way valves are fixedly installed on the cylinder head, wherein at least two of the one-way valves are installed in opposite directions.

[0010] Furthermore, an annular blocking portion is formed on the inner wall of the piston chamber, and an annular groove adapted to the annular blocking portion is opened on the piston. When the annular groove cooperates with the annular blocking portion, the valve disc closes the medium channel.

[0011] Furthermore, there are multiple vent holes, which are arranged at equal intervals along the circumference of the piston rod.

[0012] Furthermore, the number of damping orifices is one.

[0013] Furthermore, the piston rod remains sealed to the inner wall of the guide cavity.

[0014] The beneficial effects of this utility model are as follows: This utility model provides a water hammer check valve. When the valve disc opens, due to the action of the damping orifice and the vent, the valve disc moves to the right and gradually opens slowly. When the valve disc closes, due to the action of the damping orifice and the vent, the valve disc first moves rapidly to the left at a normal speed. Then, as it approaches closure, the piston blocks the vent, leaving only the damping orifice unobstructed, causing the valve disc to gradually close slowly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal cross-sectional structure of this utility model;

[0016] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0017] Reference numerals: 10-valve body, 11-medium passage, 12-bracket, 20-valve disc, 30-spring, 40-piston rod, 41-guide cavity, 42-piston cavity, 43-vent hole, 44-damping hole, 45-cylinder head, 46-check valve, 47-annular blocking part, 50-piston, 51-annular groove, 52-first sealing ring, 60-piston rod, 61-second sealing ring. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] In this application, unless otherwise expressly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to 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 utility model according to the specific circumstances.

[0020] In the description of this application, it should be understood that the terms "longitudinal", "horizontal", "level", "top", "bottom", "upper", "lower", "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first," "second," etc., 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. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0022] like Figures 1-2 As shown, this utility model provides a water hammer check valve, including a valve body 10, a valve disc 20, and a spring 30. The valve body 10 has a medium channel 11 inside. The spring 30 causes the valve disc 20 to move to the left and close the medium channel 11. The above are all prior art, and the specific structure will not be described in detail here. This utility model also includes a piston rod 40, a piston 50, and a piston stem 60.

[0023] The piston 50 cylinder is disposed inside the valve body 10 and is fixedly connected to the inner wall of the valve body 10 by a bracket 12. The front end face and the rear end face of the piston 50 cylinder respectively form a guide cavity 41 and a piston cavity 42 extending laterally inward. The front inner wall of the piston cavity 42 has a vent hole 43 and a damping hole 44 communicating with the outside, and the damping hole 44 is located in front of the vent hole 43.

[0024] The piston 50 is disposed in the piston chamber 42 and is slidably connected to the inner wall of the piston chamber 42. The piston 50 and the inner wall of the piston chamber 42 are sealed by the first sealing ring 52.

[0025] The piston rod 60 is laterally disposed within the guide cavity 41 and slidably connected to the inner wall of the guide cavity 41. The first end of the piston rod 60 is fixedly connected to the piston 50, and the second end of the piston rod 60 is fixedly connected to the valve disc 20. When the valve disc 20 closes the medium passage 11, the damping orifice 44 is located in front of the piston 50 and is in a unobstructed state, while the venting orifice 43 is blocked by the piston 50 or located behind the piston 50.

[0026] The specific working process of this utility model is as follows:

[0027] Valve disc 20 opening stage: The water pump starts, causing the medium to flow to the right. After the medium comes into contact with the valve disc 20, it pushes the valve disc 20 to move to the right. At this time, due to the action of the spring 30, the damping hole 44 and the vent hole 43, the valve disc 20 will move to the right and gradually open slowly.

[0028] During the valve 20 closing phase: After the water pump is turned off, the valve 20 moves to the left due to the action of the spring 30. At this time, due to the action of the damping orifice 44 and the venting orifice 43, the medium between the valve 20 and the piston rod 40 will be discharged through the damping orifice 44 and the venting orifice 43. Under the push of the spring 30, the valve 20 first moves to the left quickly at a normal speed. Then, as it approaches closure, the piston 50 blocks the venting orifice 43. At this time, only the damping orifice 44 is open, and the medium between the valve 20 and the piston rod 40 can only be discharged through the damping orifice 44. The discharge speed is slowed down, so the valve 20 will gradually close slowly, avoiding water hammer.

[0029] Therefore, this invention enables the valve disc 20 to open slowly when opening, move quickly when closing, and then close slowly when approaching closure.

[0030] In one embodiment, a cylinder head 45 is fixedly mounted on the rear end face of the piston 50. A plurality of one-way valves 46 are fixedly mounted on the cylinder head 45, wherein at least two of the one-way valves 46 are installed in opposite directions.

[0031] The multiple one-way valves 46 on the cylinder head 45 are not installed in the same direction. The staff selects the appropriate one based on the actual situation.

[0032] Specifically, when a faster opening speed and a slower closing speed of valve disc 20 are required, the number of one-way valves 46 that can only be opened to the right is greater than the number of one-way valves 46 that can only be opened to the left. Conversely, when a slower opening speed and a slower closing speed of valve disc 20 are required, the number of one-way valves 46 that can only be opened to the right is less than the number of one-way valves 46 that can only be opened to the left. This allows for further control of the movement speed of piston 50, and consequently, the movement speed of valve disc 20, adapting to a wider range of application scenarios.

[0033] In one embodiment, an annular blocking portion 47 is formed on the inner wall of the piston chamber 42, and an annular groove 51 adapted to the annular blocking portion 47 is opened on the piston 50. When the annular groove 51 cooperates with the annular blocking portion 47, the valve disc 20 just closes the medium passage 11.

[0034] The design of the annular groove 51 and the annular blocking part 47 limits the movement of the piston 50, making the movement of the piston 50 more stable. When the annular groove 51 and the annular blocking part 47 are engaged, the valve disc 20 just closes the medium passage 11. At this time, the discharge hole 43 is blocked by the piston 50 or located behind the piston 50.

[0035] In one embodiment, there are multiple vent holes 43, which are arranged at equal intervals along the circumference of the piston rod 40. The function of the vent holes 43 is to allow the medium to quickly enter between the piston 50 and the piston rod 40, or to allow the medium to quickly exit between the piston 50 and the piston rod 40, so that the piston 50 can reach its normal moving speed.

[0036] In one embodiment, the number of damping orifices 44 is one, reducing manufacturing complexity. The function of the damping orifice 44 is to ensure that the medium inside the piston 50 and piston rod 40 can only be slowly discharged through the damping orifice 44 during the valve disc 20 closing phase, thereby causing the valve disc 20 to gradually and slowly close.

[0037] In one embodiment, the piston rod 60 is sealed to the inner wall of the guide cavity 41 by a second sealing ring 61.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A water hammer arrestor comprising a valve body and a valve disc, the interior of the valve body having a media passage, characterized in that: Also includes: A piston cylinder is disposed in the valve body and fixedly connected to the inner wall of the valve body. An inwardly extending guide cavity and a piston cavity are formed on the front end face and the rear end face of the piston cylinder, respectively. A vent hole and a damping hole communicating with the outside are opened on the front inner wall of the piston cavity. The damping hole is located in front of the vent hole. A piston is disposed within the piston chamber and is slidably connected to the inner wall of the piston chamber, and the piston remains sealed to the inner wall of the piston chamber. A piston rod is disposed within the guide cavity and slidably connected to the inner wall of the guide cavity. The first end of the piston rod is fixedly connected to the piston, and the second end of the piston rod is fixedly connected to the valve disc. When the valve disc closes the medium channel, the damping orifice is located in front of the piston and is in a unobstructed state, and the venting orifice is blocked by the piston or located behind the piston.

2. A water hammer arrestor according to claim 1, wherein: A cylinder cover is fixedly installed on the rear end face of the piston cylinder, and a plurality of one-way valves are fixedly installed on the cylinder cover, wherein at least two of the one-way valves are installed in opposite directions.

3. A water hammer arrestor according to claim 2, wherein: An annular blocking portion is formed on the inner wall of the piston chamber, and an annular groove adapted to the annular blocking portion is opened on the piston. When the annular groove cooperates with the annular blocking portion, the valve disc closes the medium channel.

4. A water hammer arrestor according to claim 1, wherein: The number of vent holes is multiple, and the multiple vent holes are arranged at equal intervals along the circumference of the piston rod.

5. A water hammer arrestor according to claim 4, wherein: The number of damping orifices is one.

6. A water hammer arrestor according to claim 1, wherein: The piston rod remains sealed to the inner wall of the guide cavity.

Images