Check valve

Abstract

According to the technical scheme, the check valve is characterized by comprising a valve body, a water outlet and a water inlet which are communicated with each other are formed in the valve body, a valve seat is arranged on the water inlet, a valve clack is arranged on the valve seat, a telescopic connecting arm is erected on the water outlet and connected with the valve clack, and a damping device is arranged on the telescopic connecting arm. Therefore, the valve clack achieves the slow closing effect, the impact force of the sealing face of the valve clack to the sealing face of the valve seat is reduced, the water hammer phenomenon is reduced, a device for reducing impact is arranged on the valve clack and used for reducing the water hammer effect on the valve and the influence of the water hammer effect on the valve, and the service life of the valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and more specifically to a check valve. Background Art

[0002] In a water pipeline, a check valve and a gate valve are generally installed in sequence at the outlet of a water pump. The function of the check valve is to prevent the medium from flowing back into the water pump and causing the pump to reverse when the water pump stops working. Existing check valves mainly include a valve body, a valve seat, and a check valve flap. The valve seat is provided with a valve seat sealing surface and is fixed in the flow channel of the valve body. The check valve flap is provided with a flap sealing surface. The gate valve is installed behind the check valve to block the medium. Under normal working conditions, when the medium enters the inner cavity of the valve from the valve inlet side, the medium pushes the check valve flap to open. When there is no medium entering the valve inlet side, the check valve flap closes under the action of a spring.

[0003] The water pump usually operates in a periodic state. Stopping and starting the pump will cause changes in pressure and flow rate, generating a water hammer effect that will impact the pipeline and valves. The check valve flap installed behind the water pump is more likely to be damaged. During the process of the check valve flap resetting and closing, it is easy to have too fast a closing speed, resulting in too large an impact force of the flap sealing surface on the valve seat sealing surface and reducing the service life. Summary of the Utility Model

[0004] To achieve the above object, the utility model provides the following technical solution: a check valve, including a valve body, the valve body is provided with a water inlet and a water outlet that are interconnected, the water inlet is provided with a valve seat, the valve seat is provided with a valve flap, the water outlet is provided with a telescopic connecting arm connecting the valve flap, the valve flap is provided with a magnetic force shock reduction box on one side of the water outlet, sliders are arranged around the valve flap, and the inner wall of the water outlet is provided with slider grooves adapted to the sliders. The telescopic connecting arm is provided with a damping device.

[0005] The magnetic force shock reduction box includes a box body cavity, small steel balls, a magnetic force device, and a shock reduction pad; the shock reduction pad, small steel balls, and magnetic force device are arranged in sequence from the water inlet to the water outlet direction.

[0006] The small steel balls are placed in the box body cavity, and the space occupied by the small steel balls is smaller than the box body cavity.

[0007] The magnetic force device is a strong magnet, and the shock reduction pad is a shock-absorbing material.

[0008] The damping device includes a hydraulic sleeve, a hydraulic chamber A, a hydraulic chamber B, a cavity C, a hydraulic rod, a DC overflow valve A, a DC overflow valve B, and a return spring; the hydraulic rod is arranged in the hydraulic sleeve, and the return spring is arranged in the cavity C.

[0009] The DC overflow valve A is used to control the flow of liquid in hydraulic chamber A into hydraulic chamber B, and the DC overflow valve B allows the liquid in hydraulic chamber B to flow into hydraulic chamber A.

[0010] The number of the DC overflow valves A is more than that of the DC overflow valves B.

[0011] The DC overflow valves A and the DC overflow valves B are evenly arranged around the hydraulic rod.

[0012] The telescopic connecting arm is movably connected to the water outlet.

[0013] A pair of symmetrically arranged telescopic connecting arms are located at the water outlet.

[0014] In summary, the present utility model has the following beneficial effects: Through the damping device, the extension and contraction speeds of the telescopic connecting rod are effectively controlled, realizing two states of fast opening and slow closing, reducing the impact on the valve flap during closing, and reducing the generation of water hammer. The provided magnetic shock-absorbing box absorbs and dissipates the impact of water hammer on the valve flap, reduces the impact on the valve flap, and reduces the influence of the water hammer effect. The service life of the check valve is increased. Description of the Drawings

[0015] Figure 1 is the overall schematic diagram of the present utility model;

[0016] Figure 2 is the magnetic shock-absorbing box of the present utility model;

[0017] Figure 3 is the schematic diagram of the damping device of the present utility model;

[0018] Reference numerals: 1, valve body; 11, water inlet; 12, water outlet; 13, valve seat; 2, valve flap; 3, telescopic connecting arm; 4, magnetic shock-absorbing box; 41, box cavity; 42, magnetic device; 43, small steel ball; 44, shock-absorbing pad; 5, damping device; 51, hydraulic sleeve; 511, hydraulic chamber A; 512, hydraulic chamber B; 513, cavity C; 52, hydraulic rod; 521, DC overflow valve A; 522, DC overflow valve B; 53, return spring; 6, slider; 61, slider groove. Detailed Description of the Invention

[0019] The present utility model will be further described in detail below with reference to the drawings.

[0020] As shown in the atta Figure 1As shown, this embodiment: a check valve comprises a valve body 1, on which an inlet 11 and an outlet 12 are connected to each other, a valve seat 13 is provided in the inlet 11, a valve disc 2 is provided on the valve seat 13, a slider 6 is provided around the valve disc 2, and a slider groove 61 is provided on the valve wall of the outlet 12 accordingly. When the valve block is actuated, the slider 6 will slide along the corresponding slider groove 61, so that the valve disc 2 can be opened and closed in a relatively controllable manner. A retractable connecting arm 3 is provided on the outlet 12, and the connection method is a hinge connection. The retractable connecting arm 3 is movably connected to the valve disc 2, and the connection method is a hinge connection. A pair of retractable connecting arms 3 are symmetrically arranged and located at the outlet 12. This makes the valve disc 2 move smoothly when opening and closing, and prolongs its service life. A magnetic shock-reducing box 4 is provided near one side of the valve disc outlet, and a damping device 5 is provided on the retractable connecting arm.

[0021] As attached Figure 2 The magnetic shock-reducing box 4 of the utility model shown in the figure includes a box body cavity 41, a shock-reducing pad 44, a small steel ball 43, and a magnetic device 42. The shock-reducing pad 44, the small steel ball 43, and the magnetic device 42 are arranged in sequence from the water inlet 11 to the water outlet 12, and the small steel ball 43 is placed in the box body cavity 41. The space occupied by the small steel ball 43 is much smaller than the box body cavity 41, so that the small steel ball 43 can have a certain activity space in the box body cavity 41. The magnetic device 42 is tightly connected to the shell to reduce the generation of additional impact. The magnetic device 42 is a strong magnet, such as a neodymium magnet, so that the small steel ball 43 used to absorb the impact stays on the impacted side to absorb the impact, because the presence of the magnetic field can further reduce the momentum contained in the steel ball 43 when the small steel ball 43 absorbs the impact and is knocked away, reducing the impact of the knocked away small steel ball 43 on the magnetic shock-reducing box 4, and when the small steel ball 43 completes one absorption and release, it returns to the impacted side to absorb another impact. There is a shock absorbing pad 44 on the side where the small steel ball 43 is hit. The shock absorbing pad 44 is a shock absorbing material, such as EVA shock absorbing cotton, which is used to absorb the impact force of the end of the small steel ball 43, reduce the impact of the small steel ball 43 on the magnetic shock absorbing box 4, and improve the service life of the magnetic shock absorbing box 4.

[0022] As attached Figure 3As shown, the damping device 5 of the present utility model includes a hydraulic sleeve 51, a hydraulic chamber A 511, a hydraulic chamber B 512, a cavity C 513, a hydraulic rod 52, a DC overflow valve A 521, a DC overflow valve B 522, and a return spring 53. The hydraulic rod 52 is arranged in the hydraulic sleeve 51. The DC overflow valve A 521 is used to control the liquid in the hydraulic chamber A 511 to flow into the hydraulic chamber B 512, and the DC overflow valve B 522 allows the liquid in the hydraulic chamber B 512 to flow into the hydraulic chamber A 511. The number of the DC overflow valves A 521 arranged is more than that of the DC overflow valves B 522 arranged, so that the hydraulic rod 52 has different shortening and stretching speeds. The DC overflow valves A 521 and the DC overflow valves B 522 are evenly distributed around the hydraulic rod 52, so that the hydraulic rod 52 is evenly stressed during the moving process, and the service life of the hydraulic rod is prolonged. The return spring 53 is arranged in the cavity III and is used for resetting the hydraulic rod 52. Through the elastic force of the return spring 53, the hydraulic device is in the stretched state when not in use.

[0023] Working principle of the present utility model

[0024] Install the check valve into the pipeline. The liquid medium flows in from the water inlet 11 and flows out from the water outlet 12. When the pressure difference between one end of the water inlet 11 and the water outlet 12 is greater than a certain threshold value, the valve flap 2 overcomes the elastic force of the return spring 53, and the telescopic connecting arm 3 contracts, so that the valve flap 2 opens. When the pressure difference between one end of the water inlet 11 and the water outlet 12 is less than a certain threshold value, the valve flap 2 is under the action of the elastic force of the return spring 53, and the telescopic connecting arm 3 elongates, so that the valve flap 2 closes.

[0025] For further improvement, when the valve flap 2 of the present utility model closes, the telescopic damping device 5 on the telescopic connecting arm 3 elongates, the liquid in the hydraulic chamber A 511 is squeezed, and the pressure increases. When it reaches the threshold value of the DC overflow valve B 522, multiple DC overflow valves arranged on the hydraulic rod 52 are opened, and the liquid in the hydraulic chamber A 511 is pressed into the hydraulic chamber B 512, playing a damping role, so that the valve flap 2 achieves the effect of slow closing, reducing the impact force of the sealing surface of the valve flap 2 on the sealing surface of the valve seat 13, slowing down the generation of the water hammer effect, and prolonging the service life of the valve.

[0026] For further improvement, when the valve flap 2 of the present utility model opens, the telescopic damping device 5 arranged on the telescopic connecting arm 3 contracts, the liquid in the hydraulic chamber B 512 is squeezed, and the pressure increases. When it reaches the threshold value of the DC overflow valve A 521, multiple DC overflow valves arranged on the hydraulic rod 52 are opened, and the liquid in the hydraulic chamber B 512 is pressed into the hydraulic chamber A 511. Since the number of the DC overflow valves A is more than that of the DC overflow valves B, the damping effect during contraction is less than that during elongation, so that the valve flap 2 has two working states of quick opening and slow closing.

[0027] Further improvement, the closure of the valve flap 2 described in the utility model is affected by the water hammer effect, and the impact force of the water will act on the magnetic shock reduction box 4, and the impact of the impact on the valve flap will be reduced by the small steel balls in the box absorbing the momentum of the impact, and the small steel balls 43 that absorb the impact will release the absorbed momentum by being knocked away. Under the action of the magnetic force of the magnetic device 42, the flight speed of the small steel balls 43 in the knocked-away state is reduced. Because the quality and appearance of each small steel ball are slightly different, the angle and speed of the small steel balls 43 when they are knocked away will also be different, so that the small steel balls 43 will collide with each other during the flight process, further consuming kinetic energy, reducing the impact of the valve flap 2 and the magnetic shock reduction box 4, and the small steel balls 43 hit the shock reduction pad 44 used to absorb the impact force at the end of the small steel balls 43 to complete a round of absorption and release, and return to the initial impacted side under the influence of the magnetic force, and continuously receive waves of impact. The impact of water hammer is reduced and the service life of the valve is extended.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A check valve, comprising a valve body (1), the valve body being provided with a water inlet (11) and a water outlet (12) which are interconnected, the water inlet (11) being provided with a valve seat (13), the valve seat being provided with a valve flap (2), the water outlet (12) being provided with a retractable connecting arm (3) connected to the valve flap, characterized in that: The valve flap (2) is provided with a magnetic shock-reducing box (4) on one side of the water outlet (12), a slider (6) is provided around the valve flap (2), a slider groove (61) adapted to the slider (6) is provided on the inner wall of the water outlet (12), and a damping device (5) is provided on the telescopic connecting arm.

2. A check valve according to claim 1, characterized in that: The magnetic impact reduction box (4) comprises a box body cavity (41), a small steel ball (43), a magnetic device (42) and an impact reduction pad (44); the impact reduction pad (44), the small steel ball (43) and the magnetic device (42) are arranged in sequence from the water inlet (11) to the water outlet (12).

3. A check valve according to claim 2, characterized in that: The small steel ball (43) is placed in the box body cavity (41), and the space occupied by the small steel ball (43) is smaller than that of the box body cavity (41).

4. A check valve according to claim 2, characterized in that: The magnetic device (42) is a strong magnet; the shock absorbing pad (44) is a shock absorbing material.

5. A check valve according to claim 1, characterized in that: The damping device (5) comprises a hydraulic sleeve (51), a hydraulic chamber A (511), a hydraulic chamber B (512), a chamber C (513), a hydraulic rod (52), a direct current overflow valve A (521), a direct current overflow valve B (522) and a return spring (53); the hydraulic rod (52) is arranged in the hydraulic sleeve (51), and the return spring (53) is arranged in the chamber C (513).

6. A check valve according to claim 5, characterized in that: The direct current overflow valve A (521) is used to control the liquid in the hydraulic chamber A (511) to flow into the hydraulic chamber B (512), and the direct current overflow valve B (522) allows the liquid in the hydraulic chamber B (512) to flow into the hydraulic chamber A (511).

7. A check valve according to claim 5, characterized in that: The number of the DC overflow valves A (521) is greater than the number of the DC overflow valves B (522).

8. A check valve according to claim 5, characterized in that: The DC relief valve A (521) and the DC relief valve B (522) are evenly arranged around the hydraulic rod.

9. A check valve according to claim 1, characterized in that: The retractable connecting arm (3) is movably connected to the water outlet (12).

10. A check valve according to claim 1, characterized in that: A pair of telescopic connecting arms (3) are symmetrically arranged and located at the water outlet (12).

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