Waterproof hammer wafer type check valve

Abstract

The utility model relates to the field of check valves, in particular to a waterproof hammer wafer type check valve. The technical problem to be solved by the utility model is to provide a waterproof hammer wafer type check valve which integrates soft sealing closing and bidirectional buffering energy absorption, ensures reliable cut-off of reverse flow, and absorbs and dissipates shock wave energy of a water hammer at the same time. The utility model relates to a waterproof hammer wafer type check valve, which comprises a valve body, a sliding sleeve is arranged in the valve body water through hole in a sliding mode. A first clamping ring fixedly connected with the valve body is arranged at one end of the sliding sleeve; a second clamping ring fixedly connected with the valve body is arranged at the other end of the sliding sleeve; a first spring is arranged between the convex ring arranged on the sliding sleeve and the first clamping ring; and a second spring is arranged between the convex ring arranged on the sliding sleeve and the second clamping ring. The water hammer shock wave energy absorption device achieves the effects that soft sealing closing and two-way buffering energy absorption are achieved, it is ensured that reverse flow is reliably cut off, meanwhile, water hammer shock wave energy is absorbed and dissipated, and impact energy is restrained from being transmitted to a pipeline system.

Description

Technical Field

[0001] This utility model relates to the field of check valves, and in particular to a waterproof hammer-resistant clamp-type check valve. Background Technology

[0002] In fluid transport pipeline systems, water hammer is one of the key factors threatening system safety. When the fluid flow direction changes abruptly or pumps and valves suddenly start or stop, the kinetic energy of the fluid in the pipeline is rapidly converted into pressure energy, forming a high-pressure shock wave that causes repeated impacts and even structural damage to valves, fittings, and connecting equipment. Although traditional check valves can prevent backflow, their valve discs usually rely on their own weight or medium pressure to instantly impact the valve seat when the fluid reverses direction. This not only generates a strong initial closing water hammer but also lacks the ability to buffer the subsequent water hammer shock wave. Although some improved check valves, such as slow-closing and damping types, can alleviate the valve disc closing impact, their complex structure or ability to buffer only in one direction makes it difficult to effectively cope with bidirectional water hammer impacts, such as the complex working conditions of upstream pump station power failure and downstream valve rapid closure. Therefore, there is an urgent need to develop a water hammer-proof wafer check valve that combines gentle sealing and bidirectional buffering and energy absorption, ensuring reliable interception of backflow while absorbing and dissipating the energy of the water hammer shock wave. Utility Model Content

[0003] In order to overcome the shortcomings of traditional check valves in effectively dealing with bidirectional water hammer impact, the present invention aims to provide a water hammer-resistant wafer check valve that combines gentle sealing and bidirectional buffering and energy absorption, ensuring reliable backflow interruption while absorbing and dissipating the energy of water hammer shock waves.

[0004] This utility model is achieved by the following specific technical means:

[0005] A water hammer-resistant clamp-type check valve includes a valve body with a through-hole at its center extending to both ends. A sliding sleeve is slidably disposed within the through-hole of the valve body. The sliding sleeve has a through hole at its center and a protruding ring protruding from the middle section of its outer diameter surface. A first retaining ring is fixedly connected to the valve body at one end of the sliding sleeve, and a second retaining ring is fixedly connected to the valve body at the other end of the sliding sleeve. A first spring is disposed between the protruding ring and the first retaining ring of the sliding sleeve, and a second spring is disposed between the protruding ring and the second retaining ring of the sliding sleeve. A sealing seat is fixedly disposed within the through hole at the center of the sliding sleeve. A mounting plate is fixedly connected to the sliding sleeve on one side of the sealing seat. A sliding rod is slidably disposed on the mounting plate. A sealing valve plate is fixedly connected to one end of the sliding rod on the side of the sealing seat away from the mounting plate. A limit block is fixedly connected to the end of the sliding rod away from the sealing valve plate. A third spring is also disposed between the limit block and the mounting plate, and the third spring is sleeved on the outer surface of the sliding rod.

[0006] Furthermore, a conical sealing surface is provided on the end face of the sealing seat near the sealing valve plate, and a corresponding sealing surface that mates with the conical sealing surface is provided on the end face of the sealing valve plate near the sealing seat.

[0007] Furthermore, the inner diameter surfaces of the first and second retaining rings are clearance-fitted with the outer diameter surface of the sliding sleeve, and rubber sealing rings are fixedly provided on the inner diameter surfaces of the first and second retaining rings; the rubber sealing rings are in close contact with the outer diameter surface of the sliding sleeve to form a seal.

[0008] Furthermore, the outer diameter surface of the convex ring of the sliding sleeve is clearance-fitted with the inner diameter surface of the water passage hole of the valve body; and a rubber sealing ring is fixedly provided on the outer diameter surface of the convex ring; the rubber sealing ring is in close contact with the inner diameter surface of the water passage hole of the valve body to form a seal.

[0009] Furthermore, the sealing surface of the sealing valve plate is inlaid or covered with elastic sealing material to improve the sealing effect of the sealing valve plate.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] This invention achieves the combined effect of gentle sealing and bidirectional buffering and energy absorption, ensuring reliable cutoff of backflow while absorbing and dissipating water hammer shock wave energy and suppressing the transmission of impact energy to the pipeline system. Attached Figure Description

[0012] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0013] The markings in the attached diagram are as follows: 1-valve body, 2-sliding sleeve, 3-convex ring, 4-first retaining ring, 5-second retaining ring, 6-first spring, 7-second spring, 8-sealing seat, 9-mounting plate, 10-slide rod, 11-sealing valve plate, 12-limiting block, 13-third spring. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings: Example

[0015] A type of waterproof hammer-resistant wafer check valve, such as Figure 1As shown, the device includes a valve body 1 with a water passage hole extending through both ends at its center. A sliding sleeve 2 is slidably mounted within the water passage hole of the valve body 1. The sliding sleeve 2 has a through hole at its center and a protruding ring 3 protruding from the middle section of its outer diameter surface. One end of the sliding sleeve 2 is provided with a first retaining ring 4 fixedly connected to the valve body 1, and the other end of the sliding sleeve 2 is provided with a second retaining ring 5 fixedly connected to the valve body 1. A first spring 6 is provided between the protruding ring 3 and the first retaining ring 4 of the sliding sleeve 2, and a spring 6 is provided between the protruding ring 3 and the second retaining ring 5 of the sliding sleeve 2. A second spring 7 is provided; a sealing seat 8 is fixedly installed in the central through hole of the sliding sleeve 2; a mounting plate 9 is fixedly connected to the sliding sleeve 2 on one side of the sealing seat 8; a slide rod 10 is slidably installed on the mounting plate 9; a sealing valve plate 11 is fixedly connected to one end of the slide rod 10 on the side of the sealing seat 8 away from the mounting plate 9; a limit block 12 is fixedly connected to the end of the slide rod 10 away from the sealing valve plate 11; a third spring 13 is also provided between the limit block 12 and the mounting plate 9, and the third spring 13 is sleeved on the outer surface of the slide rod 10.

[0016] Working principle:

[0017] In the operation of this utility model check valve, when fluid flows into the valve body 1 from a specified direction, the fluid pressure acts on the sealing valve plate 11. This pressure overcomes the preload of the third spring 13 and pushes the sealing valve plate 11 to slide along the slide rod 10 away from the sealing seat 8. The sealing valve plate 11 leaves the conical sealing surface of the sealing seat 8, opening the valve passage. The fluid can then smoothly pass through the gap between the sealing valve plate 11 and the sealing seat 8, and then flow through the valve via the central through hole of the sliding sleeve 2.

[0018] When the fluid flow stops or attempts to reverse, the positive pressure acting on the sealing valve plate 11 disappears or becomes a reverse pressure. The restoring force of the third spring 13 immediately pushes the sealing valve plate 11 to slide along the slide rod 10 toward the sealing seat 8. The sealing surface on the sealing valve plate 11 is tightly fitted onto the conical sealing surface of the sealing seat 8, forming a reliable seal and preventing the fluid from flowing backward. This closing process is controlled by the third spring 13 and is relatively smooth, reducing the initial water hammer impact caused by the sudden impact of the valve disc on the valve seat in a normal check valve.

[0019] When water hammer occurs in the pipeline system, regardless of whether the shock wave comes from upstream or downstream, the violent pressure fluctuations will act on the entire valve core assembly. At this time, the design of the sliding sleeve 2 plays a key role. As a whole, the sliding sleeve 2 can slide axially within the water passage of the valve body 1. The first retaining ring 4 and the second retaining ring 5 at both ends limit the sliding range, and the first spring 6 and the second spring 7 elastically support it in the middle position. The impact force of the water hammer will push the entire sliding sleeve 2 and the valve core assembly fixed on it to move in the opposite direction of the impact force. The first spring 6 or the second spring 7 is compressed in this process, absorbing and buffering most of the impact energy generated by the water hammer. This makes the valve core assembly like a buffer unit "suspended" in the valve body 1, which can make axial displacement with the pressure fluctuations, greatly reducing the rigid impact of the shock wave on the valve itself and the transmission to the pipeline system. After the impact, the compressed spring releases energy, pushing the sliding sleeve 2 and the valve core assembly to smoothly return to the middle position, ready for the next action.

[0020] The check valve achieves gentle closure of the valve plate through the third spring 13, reducing water hammer during initial closure; through the dual buffer system consisting of the axially sliding sleeve 2 and the first spring 6 and the second spring 7 at both ends, it absorbs and dissipates the energy of the water hammer shock wave, allowing the entire valve core to "float" with pressure fluctuations, thereby significantly suppressing water hammer and protecting the pipeline system.

[0021] Although this disclosure has been described in detail with reference to exemplary embodiments, it is not limited thereto, and it will be apparent to those skilled in the art that various modifications and changes may be made thereto without departing from the scope of this disclosure.

Claims

1. A waterproof hammer-resistant wafer-type check valve, characterized in that, The device includes a valve body (1), with a water passage hole extending through both ends at the center of the valve body (1); a sliding sleeve (2) is slidably disposed within the water passage hole of the valve body (1), with a through hole at the center of the sliding sleeve (2) and a protruding ring (3) protruding from the middle section of its outer diameter surface; a first retaining ring (4) is provided at one end of the sliding sleeve (2) and is fixedly connected to the valve body (1); a second retaining ring (5) is provided at the other end of the sliding sleeve (2) and is fixedly connected to the valve body (1); a first spring (6) is provided between the protruding ring (3) of the sliding sleeve (2) and the first retaining ring (4); a second spring (6) is provided between the protruding ring (3) of the sliding sleeve (2) and the second retaining ring (5). Two springs (7); a sealing seat (8) is fixedly installed in the central through hole of the sliding sleeve (2); a mounting plate (9) is fixedly connected to the sliding sleeve (2) on one side of the sealing seat (8); a slide rod (10) is slidably installed on the mounting plate (9); a sealing valve plate (11) is fixedly connected to one end of the slide rod (10) on the side of the sealing seat (8) away from the mounting plate (9); a limit block (12) is fixedly connected to the end of the slide rod (10) away from the sealing valve plate (11); a third spring (13) is also provided between the limit block (12) and the mounting plate (9), and the third spring (13) is sleeved on the outer surface of the slide rod (10).

2. The anti-hammer type check valve according to claim 1, characterized in that, The sealing seat (8) has a conical sealing surface on the end face near the sealing valve plate (11), and the corresponding sealing valve plate (11) has a sealing surface that matches the conical sealing surface on the end face near the sealing seat (8).

3. The anti-hammer type check valve according to claim 1, characterized in that, The inner diameter surfaces of the first retaining ring (4) and the second retaining ring (5) are in clearance fit with the outer diameter surface of the sliding sleeve (2), and rubber sealing rings are fixedly provided on the inner diameter surfaces of the first retaining ring (4) and the second retaining ring (5).

4. A waterproof hammer-resistant clamp-type check valve according to claim 1, characterized in that, The outer diameter surface of the convex ring (3) of the sliding sleeve (2) and the inner diameter surface of the water passage hole of the valve body (1) are in clearance fit; and a rubber sealing ring is fixedly provided on the outer diameter surface of the convex ring (3).

5. A waterproof hammer-resistant clamp-type check valve according to claim 2, characterized in that, The sealing surface of the sealing valve plate (11) is inlaid or covered with elastic sealing material.

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