Novel constant pressure reversing S-tube valve

Abstract

The invention provides a novel constant pressure reversing S-tube valve. The novel constant pressure reversing S-tube valve comprises an S-shaped tube body, a valve box matched with the tube body and two delivery cylinder ports in the valve box, an inlet is located in the front end of the tube body and corresponds to the two delivery cylinder ports in the valve box, and an outlet connected with a delivery pipe is located in the rear end of the tube body. The novel constant pressure reversing S-tube valve is characterized in that the distance between the corresponding edges of the two delivery cylinder ports is larger than the inner diameter of the inlet of the tube body, an arc-shaped wing plate is arranged at the inlet of the tube body, the distances between two side edges of the arc-shaped wing plate and the corresponding edges of the inlet of the tube body are larger than the inner diameters of the delivery cylinder ports, the delivery cylinder ports on the two sides are completely shielded by the two sides of the arc-shaped wing plate at the middle position of an S-tube swing path, and the inlet of the tube body is not communicated with the two delivery cylinder ports at the middle position of the S-tube swing path. In the reversing process of the S-tube valve, an S-tube inner cavity is not communicated with the valve box, pressure in the delivery pipe can be kept stable and is not released, and conditions are created for continuous and stable conveying of materials in the pipe. The novel constant pressure reversing S-tube valve is simple and novel in structure, low in material cost and high in working efficiency and fundamentally changes performance features of an original delivery pump.

Description

technical field [0001] The invention relates to a novel constant-pressure reversing S-pipe valve, which is mainly used in pipeline conveying equipment for concrete used in engineering construction. Background technique [0002] At present, the pumping system of the concrete pump generally uses the S-pipe reversing valve. During the reversing process of the traditional S-pipe valve, when the S-pipe moves from the position of the conveying cylinder on one side to the position of the conveying cylinder on the other side, because the two conveying The distance between the cylinder interfaces is relatively short. In the transition state, the S pipe will be connected with the two conveying cylinders for a short time at the same time. At this time, the inner cavity of the S pipe, the inner cavity of the two conveying cylinders and the material cavity in the valve box are connected. , the material will flow backward from the S-pipe back to the valve box due to the action of pressur...

AI Technical Summary

Problems solved by technology

[0002] The current pumping system of the concrete pump generally uses the S-pipe reversing valve. During the reversing process of the traditional S-pipe valve, when the S pipe moves from the position of the delivery cylinder on one side to the position of the delivery cylinder on the other side, because the two delivery The distance between the cylinder interfaces is relatively short. In the transition state, the S tube will be connected to the two delivery cylinders at the same time for a short time. At this time, the inner cavity of the S tube, the inner cavity of the two delivery cylinders and the material cavity in the valve box are connected. Yes, the material will reversely flow back into the valve box from the S tube due to the effect of pressure, that is, the pressure in the inner cavity of the S tube and the delivery pipeline will be leaked, and the pressure will drop, causing the flow rate of the material in the delivery pipeline to stop or flow back into the valve box. It causes discontinuous discharge at the discharge port and large pipeline pulse, and reduces the effective displacement of the delivery pump. When it is used for spraying, it will also cause uneven and discontinuous spraying on the wall, which will affect the construction quality and construction quality. efficiency

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