Fine vacuum diaphragm pump

Abstract

The invention relates to a high-vacuum diaphragm pump, stabilizing vacuum environment when the diaphragm pump is sucking hydraulic fluid and supplying pressure requirement when discharging hydraulic fluid, which comprises a cylinder body and a oil pool cylinder. The cylinder body is provided with a pressure-fluid inlet valve and an outlet valve, the diaphragm and a support bracket are provided between them, the said piston presents a echelonment shape, the oil pool cylinder communicates with a cavum between the piston and the piston cavity via a compensator valve, the cavum between the piston and the piston cavity communicates with the diaphragm oil pressure cavity via a pressure control valve. The invention can ensure reliability service of the pump while state of stable fine vacuum suction ability is maintained.

Description

technical field [0001] The invention relates to a high self-priming diaphragm metering pump, which is suitable for diaphragm metering pumps and large hydraulic diaphragm pumps. technical background [0002] In the prior art, the hydraulic end of the hydraulically driven diaphragm pump uses a diaphragm to separate the process fluid from the hydraulic fluid, and there is no leakage, so it has a wide range of applications. However, due to the large deformation stress of the diaphragm itself, the diaphragm material can be made of PTFE, synthetic Made of materials such as rubber and stainless steel, the fluid dynamic pressure energy that needs to be consumed is more. Compared with the plunger type liquid end, the inlet resistance of the hydraulically driven diaphragm metering pump becomes larger, and for the working conditions of poor suction conditions, high liquid viscosity and high temperature, because part of the energy of the hydraulic chamber sucked into the vacuum state is...

AI Technical Summary

Problems solved by technology

Because the pumping medium contains solid particles, the diameter of the delivery pipe is relatively small or the NPSH of the device is reduced due to the increase of the medium temperature; in addition, the high-temperature medium is easy to vaporize, so that the pressure in the pump chamber is lower than the vaporization pressure of the medium, making the pump steam The corrosion performance is greatly reduced, and the possibility of pump cavitation will also be greatly increased.

[0004] Diaphragm metering pumps used in petrochemical plants have problems such as unstable discharge pressure and flow rate, easy cavitation of pumps, easy blockage of inlet and outlet valve groups and channels, and cavitation problems that may occur when inlet pressure is too low under specific working conditions. It is a technical problem that enterprises and scientific research departments must solve

[0005] In the existing diaphragm metering pump, the diaphragm is fixed in the cavity between the liquid inlet and the liquid outlet in the pump body by a bracket. A vacuum liquid inlet and pressure discharge environment are formed between the ports. Since the liquid inlet end of the compensation valve communicates with the immersion chamber of the piston, the liquid outlet end communicates with the cavity between the diaphragm and the piston, so that when the piston moves outward A proper vacuum is formed between the diaphragm and the piston, and the hydraulic fluid to be metered enters the pump cavity. At this time, the process fluid in the immersion cavity enters the cavity between the diaphragm and the piston through the compensation valve and destroys the vacuum environment formed therebetween. Seriously affect the efficiency, stability and metering reliability of the diaphragm metering pump

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