Method for determing cam outline shape of nonimpact constant flow double-plunger pump

A cam profile, double plunger pump technology, applied in the mechanical field, can solve the problems of discontinuous piston acceleration and unfavorable high-speed operation of the plunger pump.

Inactive Publication Date: 2006-11-29
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] According to the literature search, Yan Guojun and others published the article "Study on the Movement Law of Reciprocating Pump Valve" in "China Mechanical Engineering" 2004 (9): 1617-1618. This article gives a constant flow plunger pump cam design , to achieve flow without pulsation, but with this c

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  • Method for determing cam outline shape of nonimpact constant flow double-plunger pump
  • Method for determing cam outline shape of nonimpact constant flow double-plunger pump
  • Method for determing cam outline shape of nonimpact constant flow double-plunger pump

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Embodiment Construction

[0039] Embodiments are provided below in conjunction with the method of the present invention:

[0040] For a hydraulically driven cam, select h according to the flow rate and cam size requirements 1 =20,C 1 =50, when the speed change transition parameter is a=π / 6, the cam profile shape is obtained by applying the 5-stage cam profile expansion function provided by the present invention. Its plunger speed is as figure 1 As shown, the cam shape is as figure 2 As shown, when the cam speed is 1500r / min, the plunger area is 100πmm 2 , the plunger pump can output a constant flow of 59.2 liters / min. The plunger pump has no pulsation in flow rate and continuous plunger acceleration, which can realize stable high-speed operation.

[0041] In practical application, the plunger pump has the following points:

[0042] 1) It is beneficial to improve the operating efficiency of the plunger pump. Because the acceleration of the plunger is continuous, there is an example of high-speed...

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Abstract

The invention relates a method to determine the non-impact constant flow double plunger pump cam outline shape that separates the cam into five sections: plunger accelerating section, stable output section, plunger deceleration section, plunger backhaul acceleration section, plunger backhaul deceleration section. It adopts Hermite interpolating function to determine plunger speed curve. After taking integration, using the continuing condition between the sections, determining the integration constant, the five sections resolution expression would be gained. Giving the parameter in the function according to actual situation, the non-impact constant flow double plunger pump cam outline shape would be gained. The invention ensures the high speed and stable running of the plunger and is benefit to decrease the impact from the liquid to pipeline.

Description

technical field [0001] The invention relates to a method in the field of mechanical technology, in particular to a method for determining the cam profile shape of a non-impact constant-flow double-piston pump. Background technique [0002] Reciprocating plunger pumps can provide high pressure, and are mainly used in small flow, high pressure occasions, such as oil field exploitation, hydraulic drive and control and many other fields. However, many occasions often require stable flow or require as little flow pulsation as possible. In order to make the flow without pulsation, in some occasions people adjust the flow by changing the speed of the motor driving the pump, which increases the requirements for the performance of the motor, and a corresponding control system must be added, and it is difficult to achieve high-precision and stable flow in practice; Some technicians have designed new mechanisms (such as variable eccentric mechanism, inclined plate shaft structure, etc...

Claims

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Application Information

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IPC IPC(8): F04B9/04
Inventor 田中旭崔毅
Owner SHANGHAI JIAO TONG UNIV
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