External radial plunger pump of sealing mechanism

Abstract

The invention discloses a cut-water external radial plunger pump of a sealing mechanism. The external radial plunger pump comprises a pump body, an annular stator, a rotor, a plunger, a roller, a return ring, a pump chamber, a rotor sleeve, a floating isolation tongue, a central flow passage, a shaft seal device, a suction and exhaust one-way valve, an adjusting screw and the like. The rotor and a distribution shaft are combined into a whole and supported on bearings at two ends; the rotor is provided with the central flow passage, the rotor sleeve is fixedly arranged on the external circle of one end of the rotor, and a radial flow passage is formed on the rotor sleeve; the sealing mechanism is externally placed in the pump chamber through the traditional radial plunger pump, the isolation tongue is floating, and the radial clearance between the junction surfaces of the floating isolation tongue and the rotor sleeve can be randomly adjusted; and the isolation tongue is wider than the radial flow passage on the rotor sleeve and is instantaneously dredged by the suction and exhaust one-way valve. The plunger pump thoroughly solves the problem of 'shaft holding', greatly enlarges the sealing area between a high pressure cavity and a low pressure cavity, and improves the sealing effect and the volume efficiency; and the service life of the pump is prolonged. The pump can convey oil, and also can convey water.

Description

technical field [0001] The invention relates to a displacement pump, a radial plunger pump with an external sealing mechanism. Background technique [0002] The known radial plunger pump has a long history. It is widely used as a power source in hydraulic systems due to its compact structure, high-speed motor direct connection, high discharge pressure, stable liquid flow, and low noise. However, there are structural defects. First, the rotor loop is on the distribution shaft. Due to friction, it is easy to overheat, and the phenomena of shaft holding, occlusion, strain and jamming occur. It is considered to be an insurmountable congenital defect of the radial piston pump. The second is that the sealing mechanism for isolating the high-pressure chamber and the low-pressure chamber exists on the distribution shaft. Because of the narrow space, it is difficult to take effective measures to improve the sealing performance, which affects the improvement of the sealing performance...

AI Technical Summary

Problems solved by technology

It is proposed to add a floating bushing made of shape memory alloy at the joint surface of the rotor and the distribution shaft, and to reduce the gap by displacing the bushing and changing the shape through pressure and heat, so as to solve the problem of "holding the shaft". The fundamental problem on the shaft still exists. During high-speed operation, the wear and heat of the joint surface of the rotor and the distribution shaft have not been resolved.

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