A comprehensive slow closing check valve

Abstract

The application discloses a comprehensive slow-closing check valve, which comprises a valve body, a slow-closing valve piece and a first annular baffle are arranged on the liquid outlet end of the valve body, and a closed valve piece and a second annular baffle are arranged on the liquid inlet end of the valve body; the slow-closing valve piece comprises a first support and a pressure-reducing valve disc, the pressure-reducing valve disc is arranged on the side of the liquid inlet end; the pressure-reducing valve disc is arranged on the first support and can slide along the first support; a slow-closing structure is arranged on the periphery of the pressure-reducing valve disc, and a flow channel for liquid flow is formed between the slow-closing structure and the first annular baffle when the pressure-reducing valve disc is attached to the first annular baffle; the closed valve piece comprises a second support and a closed valve disc, the closed valve disc is arranged on the side of the liquid inlet end; the closed valve disc is arranged on the second support and can slide along the second support; the pressure-reducing valve disc and the closed valve disc are away from or attached to the second annular baffle along with the liquid flow. The two-stage valve piece cooperation of the check valve can realize slow-closing and check sealing closing functions, eliminate water hammer effect and effectively reduce the harm to equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of check valve, in particular to a comprehensive slow-closing check valve. BACKGROUND

[0002] The existing check valve is used for controlling the one-way flow of pipeline medium to prevent the medium from flowing backward. When the medium flows backward, the valve disc closes quickly under the action of the medium pressure, which impacts the valve seat and easily causes water hammer, thereby damaging the equipment. The existing check valve has a single function. For example, the thin plate butterfly check valve has poor sealing performance, and the slow-closing check valve is prone to water hammer effect. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art and provide a comprehensive slow-closing check valve.

[0004] The present application is achieved by the following technical scheme: a comprehensive slow-closing check valve, comprising a valve body; a slow-closing valve and a first annular baffle are installed at the liquid outlet end of the valve body, and a sealing valve and a second annular baffle are installed at the liquid inlet end of the valve body; the slow-closing valve comprises a pressure reducing valve disc and a first support, the pressure reducing valve disc is towards the liquid inlet end side, and the first support is towards the liquid outlet end side; a first positioning column is installed at the bottom side of the pressure reducing valve disc, the first positioning column is arranged on the first support and can slide along the first support, the pressure reducing valve disc is away from the first annular baffle with the forward flow of liquid, and the pressure reducing valve disc is attached to the first annular baffle with the backward flow of liquid; a gap is formed between the outer peripheral edge of the pressure reducing valve disc and the inner wall of the valve body, a slow-closing structure is arranged on the peripheral edge of the pressure reducing valve disc, and a flow channel for liquid flow is formed between the slow-closing structure and the first annular baffle when the pressure reducing valve disc is attached to the first annular baffle; the sealing valve comprises a sealing valve disc and a second support, the sealing valve disc is towards the liquid inlet end side, and the second support is towards the liquid outlet end side; a second positioning column is installed at the bottom side of the sealing valve disc, the second positioning column is arranged on the second support and can slide along the second support, the sealing valve disc is away from the second annular baffle with the forward flow of liquid, and the sealing valve disc is attached to the second annular baffle with the backward flow of liquid, and a gap is formed between the outer peripheral edge of the sealing valve disc and the inner wall of the valve body.

[0005] The flow channel is formed between the slow-closing valve and the first annular baffle, and has a gap to achieve incomplete sealing and closing, which can prevent water hammer effect caused by fast closing of the valve disc and achieve slow-closing function. The gap between the valve disc and the inner wall of the valve body forms a liquid flow channel. The cooperation of the support and the positioning column enables the valve disc to move along the support.

[0006] The second annular baffle is provided with a sealing gasket, and the sealing gasket is clamped between the sealing valve disc and the second annular baffle when the sealing valve disc is attached to the second annular baffle. The sealing gasket enables the sealing valve disc to be attached to the second annular baffle to stop the backflow of liquid.

[0007] The slow-closing structure is a wave-shaped plate, and the groove formed by the wave-shaped plate connects the space below the pressure-reducing valve disc with the space outside the pressure-reducing valve disc.

[0008] The first support includes a first support frame and a first positioning ring, the first support frame is fixed on the inner wall surface of the valve body, and the first positioning ring is arranged on the first support frame; the first positioning column is sleeved in the first positioning ring and can slide up and down. The first support frame is used for supporting the pressure-reducing valve disc, and the first positioning ring can constrain the movement range of the first positioning column.

[0009] The slow-closing valve further includes a first spring, the first spring is sleeved on the outer periphery of the first positioning column, one end of the first spring abuts against the pressure-reducing valve disc, and the other end of the first spring abuts against the first support frame. The first spring enables the pressure-reducing valve disc to always have a tendency to abut against the first annular baffle, so as to achieve backflow prevention in time.

[0010] The first support frame includes three first support feet which are uniformly distributed, one end of each first support foot is fixed on the inner wall surface of the valve body, and the other end of each first support foot is fixed on the first positioning ring.

[0011] The second support includes a second support frame and a second positioning ring, the second support frame is fixed on the inner wall surface of the valve body, and the second positioning ring is arranged on the second support frame; the second positioning column is sleeved in the second positioning ring and can slide up and down.

[0012] The sealing valve further includes a second spring, the second spring is sleeved on the outer periphery of the second positioning column, one end of the second spring abuts against the sealing valve disc, and the other end of the second spring abuts against the second support frame.

[0013] The second support frame comprises three second support legs evenly distributed, one end of the second support leg is fixed on the inner wall of the valve body, and the other end of the second support leg is fixed on the second positioning ring.

[0014] The two ends of the first support leg are located at different heights.

[0015] Compared with the prior art, the advantages of the present application are that the check valve has simple structure and good slow closing effect, the slow closing and check sealing closing functions can be realized by adopting the cooperation of two-stage valve parts, water backflow is prevented, water hammer effect is eliminated, and the harm to equipment is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 1 is a structural schematic diagram of the embodiment 1 of the present application;

[0017] Figure 2 Fig. 2 is a structural schematic diagram of the pressure reducing valve disc of the embodiment of the present application;

[0018] Figure 3 Fig. 3 is a top view of the support part of the embodiment of the present application;

[0019] Figure 4 Fig. 4 is a structural schematic diagram of the embodiment 2 of the present application in the normal liquid flow state;

[0020] Figure 5 Fig. 5 is a structural schematic diagram of the embodiment 2 of the present application in the liquid backflow state.

[0021] The meaning of the reference signs in the drawing is as follows: 1, valve body; 2, first annular baffle; 3, pressure reducing valve disc; 31, first positioning column; 32, slow closing structure; 33, first spring; 4, first support part; 5, sealing valve disc; 51, second positioning column; 52, second spring; 6, second support part; 7, second annular baffle; 8, sealing gasket. DETAILED DESCRIPTION

[0022] The content of the present application will be further described in detail below in combination with the drawing and specific implementation manner.

[0023] Embodiment 1

[0024] Reference is made to Figures 1 to 3The utility model provides a kind of comprehensive slow closing check valve, including valve body 1;Slow closing valve piece and first annular baffle 2 are installed in the liquid outlet end of valve body 1, slow closing valve piece and first annular baffle 2 are installed in the liquid inlet end of valve body 1;Slow closing valve piece includes pressure reducing valve disc 3 and first support 4, pressure reducing valve disc 3 is towards the side of liquid inlet end, and first support 4 is towards the side of liquid outlet end;Pressure reducing valve disc 3 bottom side is equipped with first positioning column 31, and first positioning column 31 is arranged on first support 4 and can slide along it, pressure reducing valve disc 3 is away from first annular baffle 2 with liquid forward flow, and pressure reducing valve disc 3 is adhered to first annular baffle 2 with liquid backflow;Pressure reducing valve disc 3 outer periphery edge and the gap between the inner wall of valve body 1, pressure reducing valve disc 3 periphery is equipped with slow closing structure 32, and slow closing structure 32 and first annular baffle 2 form the flow channel of liquid flow between when pressure reducing valve disc 3 adheres to first annular baffle 2;Closed valve piece includes closed valve disc 5 and second support 6, closed valve disc 5 is towards the side of liquid inlet end, and second support 6 is towards the side of liquid outlet end;Closed valve disc 5 bottom side is equipped with second positioning column 51, and second positioning column 51 is arranged on second support 6 and can slide along it, closed valve disc 5 is away from second annular baffle 7 with liquid forward flow, and closed valve disc 5 is adhered to second annular baffle 7 with liquid backflow, and the gap between the outer periphery edge of closed valve disc 5 and the inner wall of valve body 1.

[0025] The slow closing valve piece is provided with a flow channel between the first annular baffle 2, has a gap, realizes incomplete sealing closure, can prevent water hammer effect caused by fast closing of the valve disc, and realizes slow closing function;The slow closing valve piece and the first annular baffle 2 form a first stage valve, the closed valve piece and the second annular baffle 7 form a second stage valve, the cooperation of the two stage valves can realize slow closing and check sealing closing functions, and avoid water hammer effect.The gap between the valve disc and the inner wall of the valve body 1 forms a liquid flow channel.The cooperation of the support and the positioning column enables the valve disc to move along the support.

[0026] The second annular baffle 7 is equipped with a sealing gasket 8, and the sealing gasket 8 is clamped between the closed valve disc 5 and the second annular baffle 7 when the closed valve disc 5 adheres to the second annular baffle 7.The sealing gasket 8 enables the closed valve disc 5 to adhere to the second annular baffle 7, and stops liquid backflow.

[0027] The slow closing structure 32 is a wave-shaped plate, and the recess formed by the wave-shaped plate communicates the space below the pressure reducing valve disc 3 with the space outside the pressure reducing valve disc 3.

[0028] The first support 4 includes a first support frame and a first positioning ring, the first support frame is fixed on the inner wall surface of the valve body 1, and the first positioning ring is arranged on the first support frame;The first positioning column 31 is sleeved in the first positioning ring and can slide up and down along it.The first support frame is used for supporting the pressure reducing valve disc 3, and the first positioning ring can constrain the activity range of the first positioning column 31.

[0029] The first support frame comprises three first support legs evenly distributed, one end of the first support leg is fixed on the inner wall surface of the valve body 1, and the other end of the first support leg is fixed on the first positioning ring.

[0030] The second support 6 comprises a second support frame and a second positioning ring, the second support frame is fixed on the inner wall surface of the valve body 1, and the second positioning ring is arranged on the second support frame; the second positioning column 51 is sleeved on the second positioning ring and can slide up and down.

[0031] The second support frame comprises three second support legs evenly distributed, one end of the second support leg is fixed on the inner wall surface of the valve body 1, and the other end of the second support leg is fixed on the second positioning ring.

[0032] The two ends of the first support leg are located at different heights, and the two ends of the second support leg are located at different heights. Alternatively, the two ends of the first support leg are located at the same height, and the two ends of the second support leg are located at the same height.

[0033] Embodiment 2

[0034] Referring to Figures 4 to 5 , another comprehensive type slow closing check valve, the difference between embodiment 2 and embodiment 1 is that the slow closing valve piece further comprises a first spring 33, the first spring 33 is sleeved on the outer periphery of the first positioning column 31, one end of the first spring 33 abuts against the pressure reducing valve disc 3, and the other end of the first spring 33 abuts against the first support frame. The arrangement of the first spring 33 makes the pressure reducing valve disc 3 have a tendency to abut against the first annular baffle 2 at all times, so as to timely check.

[0035] The closed valve piece further comprises a second spring 52, the second spring 52 is sleeved on the outer periphery of the second positioning column 51, one end of the second spring 52 abuts against the closed valve disc 5, and the other end of the second spring 52 abuts against the second support frame.

[0036] The sealing gasket 8 of the embodiment is made of metal material. The check valve of the embodiment is suitable for water supply, fire protection, liquid fluid, oil and other media, and is also suitable for vertical pipe engineering, horizontal pipe and horizontal pipe use.

[0037] The check valve is installed on a pipeline. In normal use, liquid flows in the forward direction, and the liquid pushes the sealing valve disc 5 away from the liquid inlet end of the valve body 1, enters the space between the two valve members, pushes the pressure relief valve disc 3 away, and then flows out from the liquid outlet end of the valve body 1. Due to the presence of the first spring 33 and the second spring 52, the valve disc opens slowly. When the liquid flows backward, under the action of the backflow liquid and the first spring 33, the pressure relief valve disc 3 returns to the initial state, the pressure relief valve disc 3 is close to the first annular baffle 2, and the wave-shaped plate block recess of the slow-closing structure 32 forms a backflow channel for the liquid, so that there is still a gap between the pressure relief valve disc 3 and the first annular baffle 2, forming an incomplete sealing closure. The liquid enters the space between the two valve members. At this time, under the action of the backflow liquid and the second spring 52, the sealing valve disc 5 is pushed against the second annular baffle 7 and tightly sealed against the gasket 8, the liquid is isolated, and the check function is realized.

[0038] The above detailed description is a specific description of the feasible embodiments of the present application, which is not used to limit the patent scope of the present application. Any equivalent implementation or change without departing from the present application shall be included in the patent scope of the present application.

Claims

1. A comprehensive slow-closing check valve, characterized in that: The valve body includes a valve body; a slow-closing valve and a first annular baffle are installed at the outlet end of the valve body, and a sealed valve and a second annular baffle are installed at the inlet end of the valve body; the slow-closing valve includes a pressure-reducing valve disc and a first support member, the pressure-reducing valve disc facing the inlet end and the first support member facing the outlet end; a first positioning post is installed on the bottom side of the pressure-reducing valve disc, the first positioning post passes through the first support member and can slide along it, the pressure-reducing valve disc moves away from the first annular baffle with the forward flow of liquid, and the pressure-reducing valve disc adheres to the first annular baffle with the reverse flow of liquid; there is a gap between the outer peripheral edge of the pressure-reducing valve disc and the inner wall of the valve body, and a slow-closing structure is provided around the pressure-reducing valve disc, which adheres to the first annular baffle when the pressure-reducing valve disc adheres to the first annular baffle. When the baffle is formed, a flow channel for liquid circulation is formed between the slow-closing structure and the first annular baffle; the sealed valve includes a sealed valve disc and a second support member, the sealed valve disc facing the liquid inlet side and the second support member facing the liquid outlet side; a second positioning post is installed on the bottom side of the sealed valve disc, the second positioning post passes through the second support member and can slide along it, the sealed valve disc moves away from the second annular baffle as the liquid flows forward, the sealed valve disc conforms to the second annular baffle as the liquid flows backward, and there is a gap between the outer peripheral edge of the sealed valve disc and the inner wall of the valve body; the slow-closing structure is a wave-shaped plate, and the groove formed by the wave-shaped plate connects the space below the pressure reducing valve disc with the space outside the pressure reducing valve disc.

2. The integrated slow-closing check valve according to claim 1, characterized in that: The second annular baffle is equipped with a sealing gasket. When the sealing valve disc is attached to the second annular baffle, the sealing gasket is sandwiched between the sealing valve disc and the second annular baffle.

3. The integrated slow-closing check valve according to claim 1, characterized in that: The first support member includes a first support frame and a first positioning ring. The first support frame is fixed to the inner wall of the valve body, and the first positioning ring is disposed on the first support frame. The first positioning pin is sleeved inside the first positioning ring and can slide up and down along it.

4. The integrated slow-closing check valve according to claim 3, characterized in that: The slow-closing valve also includes a first spring, which is sleeved on the outer periphery of the first positioning post, with one end abutting against the pressure reducing valve disc and the other end abutting against the first support frame.

5. The integrated slow-closing check valve according to claim 3, characterized in that: The first support frame includes three evenly distributed first support legs. One end of each first support leg is fixed to the inner wall of the valve body, and the other end of each first support leg is fixed to the first positioning ring.

6. The integrated slow-closing check valve according to claim 1, characterized in that: The second support member includes a second support frame and a second positioning ring. The second support frame is fixed to the inner wall of the valve body, and the second positioning ring is disposed on the second support frame. The second positioning pin is sleeved inside the second positioning ring and can slide up and down along it.

7. The integrated slow-closing check valve according to claim 6, characterized in that: The sealed valve also includes a second spring, which is sleeved on the outer periphery of the second positioning post, with one end abutting the sealed valve disc and the other end abutting the second support frame.

8. The integrated slow-closing check valve according to claim 6, characterized in that: The second support frame includes three evenly distributed second support legs. One end of each second support leg is fixed to the inner wall of the valve body, and the other end of each second support leg is fixed to the second positioning ring.

9. The integrated slow-closing check valve according to claim 5, characterized in that: The two ends of the first support leg are at different heights.

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