Vertical self-priming pump valve-free self-antisiphoning device

Abstract

The invention relates to a vertical self-priming pump valve-free self-antisiphoning device, which is characterized in that a motor is arranged on a motor cabinet and is connected with a shaft coupling chamber; a bearing is arranged on a bearing pedestal; a machine is sealed on a rotating shaft; an impeller is positioned at the lowest part of a pump pressure discharge chamber; a liquid inlet is positioned at the uppermost part of the discharge chamber; a liquid outlet is positioned in the middle of the impeller and a liquid inlet pipe orifice; and an air inlet is formed on the part wall for separating the water inlet chamber of a pump from a water outlet chamber, namely in the position adjacent to a basic liquid level horizontal plane. The invention has the advantages that the invention can ensure that the traditional antisiphoning valve (including water outlet inverted valve, air valve and water inlet bottom valve) is eliminated, so that the use of the valve is thoroughly eliminated; and no sealing surface and additional parts are required, so that the structure of the product is simplified and the problem of liquid discharge after stoppage is solved. The invention has high reliability, reduces the production cost, and reduces the use and the maintenance expenses of a user. The requirements on conveying media are reduced greatly; and the effect of external environment can be not generated as long as liquid in the pump can flow. The blocked problem does not exist.

Description

technical field [0001] The invention relates to a valveless self-siphon prevention device for a vertical self-priming pump, which belongs to the technical field of self-priming pumps. Background technique [0002] At present, in order to prevent the liquid in the pump body from flowing backward due to siphon after the shutdown, all kinds of self-priming pumps mainly adopt valve structure, and use the following methods to solve the problem. 1. Use the suction pipeline with a bottom valve (as shown in Figure 1). 2. Use a liquid outlet pipeline with a check valve (as shown in Figure 2). 3. Use U-shaped suction pipeline with self-control air valve (as shown in Figure 3). Figure 1 and Figure 2 show the anti-siphon method adopted earlier. The method used is that after the shutdown, the valve is closed under the pressure of the return liquid, so that the siphon is interrupted. The valve structure of these two methods is simple, and the production cost is relatively low. Howeve...

AI Technical Summary

Problems solved by technology

Second, the opening and closing of the valve, and under the scouring of the liquid, after a certain period of time, the sealing surface will have problems such as deformation, scaling, and wear

Third, the air valve used on most vertical self-priming pumps, due to its special structure, after the shutdown, there will always be liquid leaking from the gap where it opens the air intake. If the position of the liquid outlet pipe Higher, it is necessary to add other devices to prevent a large amount of liquid from leaking out

It is also not suitable for occasions with explosion-proof requirements

Fourth, the liquid leaked from the intake hole of the air valve will affect the life of the air valve and cause the electromagnetic coil of the air valve to burn out

Fifth, in cold regions, the valve still has the problem of being frozen

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