Axisymmetric curved surface rotary variable displacement pump

Abstract

The invention provides an axisymmetric curved surface rotary variable displacement pump. The pump is characterized in that wear-resistant linings with good lubricating properties and low friction coefficients wrap stressed faces on negative pressure area sides of slide dampers and / or a plurality of axial through grooves are arranged on stressed face sides of the slide dampers and sliding chutes of a separation disc. The pump has the beneficial effects that under the condition that single sides of the slide dampers are stressed, the lubricating properties are improved, sliding friction is reduced, not only is the reciprocating motion resistance low, the load low and the invalid axle power consumption low, but also wear of the stressed faces of the slide dampers is reduced and the service lives are prolonged; besides, the conveying pressure of the pump can be also increased and some high pressure rotary variable displacement pumps can be developed; and as the sliding lubricating properties of the slide dampers are increased, basically frictional heating can not be generated and the plastics with good wear resistance can be adopted as damper components.

Description

technical field [0001] The invention is an improvement to an axisymmetric curved surface rotary displacement pump, in particular to an axisymmetric curved surface rotary variable displacement pump which not only has a wide material selection range for a sliding baffle plate, but also has a wide application range and can withstand relatively high fluid pressure. Background technique [0002] The axisymmetric surface rotary variable displacement pump is a new type of rotary volumetric pump. Its working efficiency is very high, the pumping efficiency is as high as 70~80%, which is about 30~40% higher than that of ordinary centrifugal pumps, especially in small flow, When used under high pressure conditions, the efficiency will be about 40% higher than that of centrifugal pumps. For example, the flow rate is 20~30m 3 / h, a centrifugal pump with a head of 0.8MPa generally has an efficiency of only 35-40%, while an axisymmetric curved surface rotary variable displacement pump tha...

AI Technical Summary

Problems solved by technology

However, the pressure difference between the two sides of the sliding baffle is relatively large, usually as high as 1 MPa and above. The unilateral support of the sliding baffle protruding from the partition is stressed, and the requirements for the flexural strength of the sliding baffle material are very high, so only the flexural strength of the sliding baffle can be used. High-strength metals, thus limiting some non-metallic materials with good corrosion resistance and low friction coefficient, such as modified ultra-high molecular weight polyethylene, modified polytetrafluoroethylene, polyphenylene sulfide and other plastics as sliding baffles (because Low flexural strength, unilateral force is easy to bend and deform, especially when transporting temperature media (60°C and above), deformation will occur at 0.8MPa, which will affect normal sliding), and it also limits the use of rotary variable displacement pumps for transport Corrosive medium, and the metal sliding baffle can only withstand the working pressure of no more than 1.2MPa

Secondly, the sliding baffle is unilaterally stressed, and the force point of the baffle and the end surface of the chute of the partition plate is concentrated on a vertical line, which causes the local resistance to increase when the baffle slides reciprocally, which may easily cause the baffle to be stuck or damaged, and Also increases useless axis power consumption

Furthermore, the main function of the sliding baffle is to separate the high and low pressure areas. From this function, the thinner the thickness, the greater the effective volume of the pump under the guaranteed strength. However, in order to resist the high pressure on one side without bending, the thickness of the baffle must be increased to reduce Effective volume of the pump

In addition, the protruding lines or rollers at the end of the metal sliding baffle continue to rub against the curved surface of the metal curved turntable, both of which are hard materials and suffer severe wear and tear, resulting in shortened service life of the sliding baffle and curved turntable

The function of the partition plate is only to divide the cylindrical pump chamber into left and right chambers. In order to reduce the volume and weight of the pump as much as possible, the partition plate only needs to reach the minimum thickness of the strength in theory. However, this will cause the sliding baffle to move axially. Short, and too short axial chute will affect the reliable sliding of the baffle. In order to ensure the reliable reciprocating movement of the sliding baffle, the thickness of the partition must be thickened. Usually the thickness of the partition is 50~120mm, which increases the volume of the pump. and weight

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