Pneumatically-controlled variable reciprocating pump

Abstract

The invention relates to a pneumatically-controlled variable reciprocating pump which is pneumatically controlled, multi-outlet and flow-adjustable and applied to work conditions of oil field injection. The pump comprises a pump body, a plunger, an intake valve group, a discharge valve group and a pneumatically-controlled adjustment plunger component, wherein the component comprises a sealing boxbody, an adjustment plunger, an air spring and an adjustment device; the sealing box body is arranged on the pump body; the air spring is used for making the adjustment plunger move in axial direction; the adjustment device is used for adjusting a distance between a valve face of the adjustment plunger and a valve seat on the sealing box body; the air spring comprises an air piston hole which is formed on the adjustment plunger; an air piston is arranged in the air piston hole hermetically; a size-adjustable air chamber is formed in the air piston hole; and external compressed air is led intothe air chamber through a through hole of the air piston. The pump has the advantages of large adjustment range of the output flow of the pump, high adjustment accuracy, convenient adjustment, wide range of an adaptive discharge pressure, low vibration and noise, small volume of the adjustment device, and the like; and the flow of a plurality of outlets of a multi-cylinder reciprocating pump is adjustable.

Description

technical field [0001] The invention relates to a variable-variable plunger reciprocating pump, in particular to an air-controlled plunger reciprocating pump with multiple output ports and adjustable flow, which is suitable for working conditions such as oil field injection. Background technique [0002] The plunger reciprocating pump is a positive displacement pump. The output flow of the pump is related to the diameter of the plunger, the stroke of the pump and the speed of the pump (reciprocations per minute). The method of adjusting the output flow of the pump by replacing the plunger with different diameters is rarely used due to the inconvenience of operation. The output flow of the pump is adjusted by changing the stroke of the plunger, which has high adjustment accuracy, but the structure of the power end is complicated, and it is usually only used in metering pumps. Energy is wasted if reflux is used to adjust flow. At present, most of the existing plunger recipro...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an air-controlled variable reciprocating pump using compressed air as the restoring force of the plunger to overcome the impact and noise caused by the spring and the volume of the adjusting device. , can not be used in low discharge pressure occasions and other shortcomings, so that the plunger reciprocating pump has a large adjustment range of pump output flow, high adjustment accuracy, convenient adjustment, wide range of discharge pressure, and is suitable for multiple cylinder reciprocating pumps. While the flow rate of the discharge port can be adjusted, it can also reduce vibration and noise, and reduce the volume of the adjustment device

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