Air supply device for backflow preventer

Abstract

The invention relates to the technical field of air supply devices, and discloses an air supply device for a backflow preventer. The air supply device comprises a connecting sleeve, a sealing element, a sealing valve plate, a guide sleeve and a sealing sleeve, wherein the sealing element is arranged on the sealing valve plate, a clamping groove matching with the sealing element is formed in the side wall of the sealing sleeve, first connecting rods are fixedly arranged at the top and the bottom of the right side wall of the guide sleeve correspondingly, second connecting rods are fixedly arranged at the top and the bottom of the left side wall of the sealing sleeve correspondingly, the first connecting rods and the second connecting rods are correspondingly arranged in position, clamping mechanisms are arranged between the opposite ends of the first connecting rods and the second connecting rods, a T-shape mechanism is arranged on the right side of the sealing sleeve, the sealing mechanism is arranged between the sealing sleeve and the connecting sleeve, and fixing mechanisms are arranged between the upper side and the lower side of the sealing sleeve and the upper side and the lower side of the connecting sleeve. According to the air supply device for the backflow preventer, a wire sleeve and a sealing sleeve can be conveniently detached and taken out from the interior of the connecting sleeve, and the detaching strength of workers is reduced.

Description

technical field [0001] The invention relates to the technical field of air supply devices, in particular to an air supply device for a backflow preventer. Background technique [0002] The main function of the backflow preventer is to ensure the one-way flow of the medium in the pipeline and prevent backpressure backflow and siphon backflow. The backpressure backflow is the backflow caused by the rise of the outlet pressure and the leakage of the outlet check valve, and the siphon backflow is the drop of the inlet pressure. caused backflow. When the backflow occurs, the drain valve of the backflow preventer opens to discharge part or all of the pressure water in the middle chamber out of the valve body. After the two-stage check valve of the backflow preventer is closed, the middle cavity forms a closed cavity. When the pressure in the middle cavity drops to atmospheric pressure, the water in the cavity is difficult to discharge or the discharge is slow. It is difficult to ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides an air replenishing device for a backflow preventer, which facilitates the disassembly and removal of the wire sleeve and the sealing sleeve from the inside of the connecting sleeve, reduces the disassembly strength of the staff, and solves the current problems caused by the guide sleeve and the sealing sleeve. The sleeves are fixed inside the connecting sleeve by means of threaded connection. When the guide sleeve and the sealing sleeve need to be disassembled from the inside of the connecting sleeve, it is necessary for the staff to extend their fingers into the inside of the connecting sleeve. The operation is more complicated.

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