Limiting noise reduction piston check valve

Abstract

The utility model relates to the technical field of piston check valve, and disclose a limit noise reduction piston check valve, including check valve body, check valve body includes valve body, valve cover, valve core subassembly and limit mechanism, the inside fixedly connected with valve seat of valve body, and the water inlet chamber and the water outlet chamber are separated out through the valve seat, the water inlet chamber and the water outlet chamber are connected with water inlet pipe and water outlet pipe respectively, the inner wall fixedly connected with buffer pad of water inlet chamber, the valve cover is connected with the mounting hole of valve body top through the installation part, the connecting place of valve body and valve cover is provided with sealing groove, is equipped with sealing washer in sealing groove, adopts manual adjustable limit rod, scale line and indicator plate, simple structure, low in cost, need not external power, support visual adjustment, be convenient for on -the -spot accurate control flow, add buffer pad, sealing plug, impact -resistant board, form multiple buffering and soft seal, the valve seat is equipped with flow guide groove and communication hole, balance pressure, reduce turbulent noise.

Description

Technical Field

[0001] This utility model relates to the field of piston check valve technology, specifically a limit-positioning and noise-reducing piston check valve. Background Technology

[0002] Piston check valves are key components in industrial fluid pipelines to prevent backflow of media.

[0003] Currently, common piston-type check valves suffer from limitations in applicable scenarios and a lack of diverse noise reduction measures. For example, CN220727129U discloses a piston-type check valve with limit noise reduction, which includes a valve body. The top of the valve body is threadedly connected to a top cover. A rotary cylinder is provided at the top of the top cover. A rotary rod is fixedly connected to the output end of the rotary cylinder. A gear is fixedly connected to the side wall of the rotary rod. A rack that penetrates the interior of the top cover is meshed with the side wall of the gear. A connecting rod is fixedly connected to the side wall of the rack.

[0004] As can be seen from the above-mentioned publicly available solutions, the limit control of the piston-type check valve relies on pneumatic components, which is costly and requires external power, thus limiting its applicable scenarios. The noise reduction measures are limited to reducing friction with materials alone. When the valve plate closes, it collides rigidly with the valve seat, which can easily generate water hammer and impact noise. At the same time, it can easily generate fluid vortices, further increasing the operating noise. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a limit-positioning and noise-reducing piston check valve, which solves the problems of limited application scenarios and single noise reduction measures of existing piston check valves.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a limit-positioning and noise-reducing piston-type check valve, comprising a check valve body, the check valve body including a valve body, a valve cover, a valve core assembly, and a limiting mechanism. A valve seat is fixedly connected inside the valve body, and the valve seat separates an inlet chamber and an outlet chamber. The inlet chamber and the outlet chamber are respectively connected to an inlet pipe and an outlet pipe. A buffer pad is fixedly connected to the inner wall of the inlet chamber. The valve cover is connected to the mounting hole on the top of the valve body through a mounting part. A sealing groove is provided at the connection between the valve body and the valve cover. A sealing pad is provided in the sealing groove. A manually adjustable limit rod, scale line, and indicator plate are used to support visual adjustment, which is convenient for precise flow control on site. The addition of a buffer pad, sealing plug, and impact-resistant plate forms multiple buffers and soft seals. The valve seat is provided with a guide groove and a connecting hole to balance pressure and reduce turbulence noise.

[0007] Preferably, the limiting mechanism includes an adjusting tube, a limiting rod, a fixing ring, an indicator plate, and a locking nut. The adjusting tube is fixedly connected to the center of the valve cover and has scale lines on its outer wall. The limiting rod is threadedly connected to the adjusting tube and has a knob at its upper end. The extension length of the limiting rod can be precisely controlled by manually turning the knob.

[0008] Preferably, the valve core assembly is disposed in the valve body and includes a piston cylinder, a piston body, a spring, a piston rod, a valve plate, and a sealing plug. The piston cylinder is fixed below the valve cover, and the piston body is slidably disposed inside the piston cylinder. The valve plate is automatically closed by the spring force, requiring no external power, and has a simple structure and low cost.

[0009] Preferably, the bottom of the valve seat is provided with an annular guide groove, the top of the guide groove is connected to a connecting hole, one end of the connecting hole is connected to a limiting groove for accommodating the sealing plug at the bottom of the valve plate, the sealing plug is T-shaped, and the bottom of the sealing plug is fixed with an impact-resistant plate, the sealing plug is used to absorb the impact energy when the valve plate is closed.

[0010] Preferably, the fixing ring is fixedly connected to the outside of the limiting rod, and the indicator plate is fixed to the fixing ring and moves with it to indicate the scale line. The indicator plate and scale line make it easy for people to see the extension position of the limiting rod intuitively and support visual adjustment.

[0011] Preferably, one end of the piston rod is connected to the piston body, and the other end is connected to the valve plate. The spring is sleeved on the outside of the piston rod and provides a preload force to make the valve plate tend to close.

[0012] Preferably, the locking nut is threaded onto the surface of the limiting rod to lock the position of the limiting rod.

[0013] Compared with the prior art, this utility model provides a limit-positioning and noise-reducing piston-type check valve, which has the following beneficial effects: By setting a precisely adjustable limit mechanism, the maximum opening height of the valve plate can be controlled, avoiding violent slapping and impact caused by excessive valve plate opening under excessive flow, which significantly improves the stability and service life of valve operation. The setting of scale lines and indicator plates makes the adjustment process intuitive and precise. By integrating multiple noise reduction and buffering structures such as flow guide grooves, connecting holes, buffer pads, sealing plugs and impact-resistant plates, the turbulence noise when the fluid passes through and the impact noise and water hammer effect when the valve plate is closed are effectively reduced, achieving low-noise and impact-free stable operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the installation structure of the limiting mechanism of this utility model; Figure 3 yes Figure 2 A cross-sectional view of the piston rod and piston cylinder mounting structure; Figure 4 This is a cross-sectional view of the valve seat structure of this utility model; Figure 5 This is a schematic diagram of the valve body structure of this utility model.

[0015] In the diagram: 1. Check valve body; 2. Valve body; 21. Valve seat; 211. Guide groove; 212. Connecting hole; 213. Limiting groove; 22. Inlet chamber; 23. Outlet chamber; 24. Inlet pipe; 25. Outlet pipe; 26. Mounting hole; 27. Sealing groove; 28. Buffer pad; 3. Valve cover; 31. Mounting part; 32. Sealing pad; 33. Piston cylinder; 34. Piston body; 35. Spring; 36. Piston rod; 37. Valve plate; 38. Sealing plug; 39. Impact resistant plate; 4. Limiting mechanism; 41. Adjusting pipe; 42. Scale line; 43. Limiting rod; 44. Fixing ring; 45. Indicator plate; 46. Locking nut; 47. Knob. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides a technical solution: a limit-positioning and noise-reducing piston-type check valve, including a check valve body 1. The check valve body 1 includes a valve body 2, a valve cover 3, a valve core assembly, and a limiting mechanism 4. The outer side of the valve cover 3 is polygonal, facilitating rotational assembly and disassembly using a wrench. A valve seat 21 is fixedly connected inside the valve body 2, and the valve seat 21 divides the valve body 2 into an inlet chamber 22 and an outlet chamber 23. The inlet chamber 22 and the outlet chamber 23 are respectively connected to an inlet pipe 24 and an outlet pipe 25. Both the inlet pipe 24 and the outlet pipe 25 are provided with a connecting flange at one end for easy connection to a piping system. A buffer pad 28 is fixedly connected to the inner wall of the water inlet chamber 22 by bolts. The buffer pad 28 is made of rubber and can buffer the water flow and reduce noise. The valve cover 3 is connected to the mounting hole 26 on the top of the valve body 2 through the mounting part 31. The outer side of the mounting part 31 is provided with external threads, and the inner wall of the mounting hole 26 is provided with internal threads, which facilitates threaded installation and removal and facilitates the maintenance of the check valve later. A sealing groove 27 is provided at the connection between the valve body 2 and the valve cover 3. A sealing gasket 32 ​​is provided in the sealing groove 27. The sealing gasket 32 ​​is squeezed by the valve cover 3 to ensure the sealing of the connection.

[0018] The limiting mechanism 4 includes an adjusting tube 41, a limiting rod 43, a fixing ring 44, an indicator plate 45, and a locking nut 46. The adjusting tube 41 is fixedly connected to the center of the valve cover 3, and its outer wall is provided with a scale line 42. The limiting rod 43 is threadedly connected to the adjusting tube 41, and its upper end is provided with a knob 47. The extension length of the limiting rod 43 can be precisely controlled by manually turning the knob 47. The fixing ring 44 is fixedly connected to the outside of the limiting rod 43. The indicator plate 45 is fixed on the fixing ring 44 and moves with it to indicate the scale line 42. The indicator plate 45 and the scale line 42 make it easy for people to see the extension position of the limiting rod 43 intuitively, supporting visual adjustment. The locking nut 46 is threadedly connected to the surface of the limiting rod 43 to lock the position of the limiting rod 43.

[0019] The valve core assembly is located inside the valve body 2 and includes a piston cylinder 33, a piston body 34, a spring 35, a piston rod 36, a valve plate 37, and a sealing plug 38. The piston cylinder 33 is made of polytetrafluoroethylene or composite material to reduce friction. At the same time, a damping device is provided at the outlet end to buffer the extension and retraction of the piston rod 36. The piston cylinder 33 is fixed below the valve cover 3. The piston body 34 is slidably disposed inside the piston cylinder 33. The valve plate 37 is automatically closed by the elastic force, without the need for external power. The structure is simple and the cost is low. One end of the piston rod 36 is connected to the piston body 34, and the other end is connected to the valve plate 37. The spring 35 is sleeved on the outside of the piston rod 36 and provides a preload force to make the valve plate 37 tend to close.

[0020] The bottom of the valve seat 21 is provided with an annular guide groove 211, and the top of the guide groove 211 is connected to a connecting hole 212. The inner wall of the connecting hole 212 is slidably connected to the sealing plug 38. The T-shaped sealing plug 38 can contact and squeeze with the limiting groove 213 for buffering. One end of the connecting hole 212 is connected to the limiting groove 213 to accommodate the sealing plug 38 at the bottom of the valve plate 37. The bottom of the sealing plug 38 is fixed with an impact-resistant plate 39, which is made of polytetrafluoroethylene. The sealing plug 38 is used to absorb the impact energy when the valve plate 37 is closed.

[0021] The working principle of this device is as follows: During installation, the inlet pipe 24 and outlet pipe 25 are connected to the pipeline system. When the medium flows from the inlet pipe 24 into the inlet chamber 22, the buffer pad 28 buffers the impact force of the medium. The pressure acts on the valve plate 37, overcoming the preload of the spring 35, and pushes the valve plate 37, piston rod 36, and piston body 34 upward, opening the valve. The medium flows into the outlet chamber 23 through the valve seat 21 and out of the outlet pipe 25. The downward extension length of the limit rod 43 is adjusted by the knob 47. When the valve plate 37 moves upward and contacts the lower end of the limit rod 43, its movement is restricted, thereby precisely controlling the maximum opening of the valve plate 37. When the medium pressure decreases or backflow occurs, the valve plate 37 closes quickly under the action of elastic force and the reverse pressure of the medium. During the closing process, the sealing plug 38 is embedded in the limit groove 213 and the connecting hole 212 of the valve seat 21 to form a soft seal, which effectively reduces collision noise. The guide groove 211 and the connecting hole 212 on the valve seat 21 effectively guide the medium and reduce eddy currents and vibration noise.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A limit-positioning and noise-reducing piston-type check valve, comprising a check valve body (1), characterized in that: The check valve body (1) includes a valve body (2), a valve cover (3), a valve core assembly, and a limiting mechanism (4). A valve seat (21) is fixedly connected inside the valve body (2), and the valve seat (21) separates the inlet chamber (22) and the outlet chamber (23). The inlet chamber (22) and the outlet chamber (23) are respectively connected to an inlet pipe (24) and an outlet pipe (25). A buffer pad (28) is fixedly connected to the inner wall of the inlet chamber (22). The valve cover (3) is connected to the mounting hole (26) on the top of the valve body (2) through the mounting part (31). A sealing groove (27) is provided at the connection between the valve body (2) and the valve cover (3). A sealing pad (32) is provided in the sealing groove (27).

2. The limit-positioning and noise-reducing piston check valve according to claim 1, characterized in that: The limiting mechanism (4) includes an adjusting tube (41), a limiting rod (43), a fixing ring (44), an indicator plate (45), and a locking nut (46). The adjusting tube (41) is fixedly connected to the center of the valve cover (3), and its outer wall is provided with scale lines (42). The limiting rod (43) is threadedly connected to the adjusting tube (41), and its upper end is provided with a knob (47).

3. The limit-positioning and noise-reducing piston check valve according to claim 1, characterized in that: The valve core assembly is located inside the valve body (2) and includes a piston cylinder (33), a piston body (34), a spring (35), a piston rod (36), a valve plate (37), and a sealing plug (38). The piston cylinder (33) is fixed below the valve cover (3), and the piston body (34) is slidably disposed inside the piston cylinder (33).

4. The limit-positioning and noise-reducing piston check valve according to claim 3, characterized in that: The valve seat (21) has an annular guide groove (211) at the bottom, and a connecting hole (212) is connected to the top of the guide groove (211). One end of the connecting hole (212) is connected to a limiting groove (213). The sealing plug (38) is T-shaped, and an impact-resistant plate (39) is fixed to the bottom of the sealing plug (38).

5. A limit-positioning and noise-reducing piston-type check valve according to claim 2, characterized in that: The fixing ring (44) is fixedly connected to the outside of the limiting rod (43), and the indicator plate (45) is fixed on the fixing ring (44) and moves with it to indicate the scale line (42).

6. A limit-positioning and noise-reducing piston-type check valve according to claim 3, characterized in that: The piston rod (36) is connected to the piston body (34) at one end and to the valve plate (37) at the other end. The spring (35) is sleeved on the outside of the piston rod (36) and provides a preload force to make the valve plate (37) tend to close.

7. A limit-positioning and noise-reducing piston-type check valve according to claim 2, characterized in that: The locking nut (46) is threaded onto the surface of the limiting rod (43) to lock the position of the limiting rod (43).

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