Passive shuttle type device for preventing water hammer and thrash

Abstract

The invention discloses a passive shuttle type water hammer and concussion prevention device, which is related to a non-return and stop device of a water delivery pipe and aims at solving the problem that the existing devices are not provided with the adjusting function of the start-stop speed. An infusion pipe (2) of a pump (1) of the passive shuttle type water hammer and concussion prevention device is sequentially connected with a non-return valve (3) and a stop valve (4) in series. The device of the invention is characterized in that the non-return valve (3) is a shuttle type non-return valve; one end of a shell body (4) of the non-return valve is provided with a water inlet pipe (5) while the other end is provided with a bracket (6) fixedly connected with a shuttle cylinder (7); a piston (8) and a piston rod (9) are in movable fit with the shuttle cylinder (7); a damping hole (10) on the piston (8) is connected with an adjusting device; the piston rod (9) is fixedly connected with a valve clack (11) which is in a sealing way matched with an inner end valve seat (14) of the water inlet pipe (5).

Description

Technical field: [0001] The present invention relates to non-return and shut-off devices for liquid delivery pipes. Background technique: [0002] There are swing or lift check valves and stop valves connected in series on the discharge pipe of the pump. This set of devices has the following disadvantages: [0003] 1. Lift and swing check valves do not have the function of opening and closing speed adjustment. [0004] 2. The asymmetric structure of the lifting or swing check valve and the flow conditions in the valve are not conducive to alleviating shock and water hammer. [0005] 3. There is no ventilation valve in the discharge pipe, so the source of vibration cannot be eliminated, which affects the service life of the infusion pipe. [0006] 4. The check valve cannot be closed and opened slowly. The sudden cut-off of the fluid in the infusion tube in operation and some gas in the medium are easy to produce water hammer, which makes the infusion tube bear great pressur...

AI Technical Summary

Problems solved by technology

[0005] 3. There is no ventilation valve in the discharge pipe, so the source of vibration cannot be eliminated, which will affect the service life of the infusion pipe

[0006] 4. The check valve cannot be closed and opened slowly. The sudden cut-off of the fluid in the running infusion tube and some gas in the medium are prone to water hammer, which makes the infusion tube bear great pressure and shock

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