High-property high-pressure three-screw pump

Abstract

The invention relates to a high-property high-pressure three-screw pump. The high-property high-pressure three-screw pump comprises a pump body, a liner, a driving screw and two driven screws, wherein the liner is formed by connecting three sections of split liners in sequence; three matching holes matched with the driving screw and the driven screws are respectively formed in the both axial ends of each section of the split liner; the three sections of the split liners respectively comprise a front liner, a middle liner and a rear liner; each driven screw consists of a front section screw, a middle section screw and a rear section screw; the outer ends of the front section screws of the two driven screws are respectively arranged on the pump body and are in the shape of a cantilever; the outer ends of the rear section screws of the two driven screws are respectively arranged in the three matching holes in the outer end of the rear liner through axle sleeves in the cantilever shape; the both ends of the middle section screw of each driven screw respectively are in contact with the corresponding front section screw and rear section screw, so that the middle section screws are in a shape of a float rod. According to the high-property high-pressure three-screw pump provided by the invention, the highest working pressure is 20.0MPa, the machining difficulty is reduced, and the matching precision among parts is improved, so that the reliability and the volume efficiency of the pump can be improved.

Description

technical field [0001] The invention belongs to the technical field of displacement screw pumps, in particular to a high-pressure three-screw pump. Background technique [0002] Compared with traditional centrifugal pumps, gear pumps, and reciprocating pumps, three-screw pumps, which belong to the category of industrial pumps, have outstanding advantages such as stable flow, small pressure fluctuations, high efficiency, and long service life. They have been widely used in metallurgy, machinery, electric power, and ships. be applied in other industries. However, the traditional high-pressure three-screw pump generally has low pressure, which makes it unable to meet the use requirements in some fields such as the transportation of liquid fuel from low pressure to high pressure in power plants. In addition, under high pressure conditions, the effective screw section of the three-screw pump must be lengthened, which makes it very difficult to process the integrated bush and dri...

AI Technical Summary

Problems solved by technology

The above structure has the following problems: ①In general, the higher the delivery pressure of the screw pump, the longer the effective length of the screw is required. Since the bushing 18 and the driven screw 19 are both integral structures, with the bushing 18 and the driven screw The longer the length of 19, the more difficult it is to process and the more difficult it is to ensure the machining accuracy, especially the processing of the screw holes at both ends of the bushing is extremely difficult; Deflection deformation will inevitably occur during processing and operation, which affects the meshing gap between it and the helical surface of the driving screw 1, and also affects the gap between the outer circle of the helical surface of the driven screw 19 and the inner hole of the bushing 18

If the gap is too small, it is easy to cause the product to "hold the shaft" or even get stuck during operation; if the gap is too large, the volumetric efficiency of the pump will decrease

It is precisely because of the above two problems that the traditional high-pressure three-screw pump can only be applied to working conditions below 8.0MPa (individual pumps can reach up to 10.0MPa)

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