Novel combined double-plunger assembly

Abstract

The invention relates to the technical field of plunger pumps, and discloses a novel combined double-plunger assembly which comprises an outer plunger assembly and an inner plunger assembly which areinstalled in a pump cavity plunger sealing assembly, and the inner plunger assembly is installed in an inner cavity of the outer plunger assembly; and an outer plunger sealing assembly is arranged between the outer plunger assembly and the pump cavity plunger sealing assembly, an inner plunger sealing assembly is arranged between the inner cavity of the outer plunger assembly and the inner plungerassembly. According to the novel combined double-plunger assembly, by the adoption of a combined double-plunger assembly structure with an inner plunger and an outer plunger, the outer plunger assembly and the inner plunger assembly work relatively independently, so that when the outer plunger assembly works, the output displacement and pressure of a whole pump correspond to diameter parameters of an outer plunger body, the inner and outer plunger assemblies with the different diameters can be rapidly switched to be used without disassembling the pump to replace the plungers or a pump head body, and the requirements for different output displacement and pressure working conditions on site are met; and the effects are achieved through one step, the design is ingenious, time and labor are saved, and convenience and quickness are achieved.

Description

technical field [0001] The invention relates to the technical field of plunger pumps, in particular to a novel combined double plunger assembly. Background technique [0002] With the deepening of the country's development of the oil field, a large number of plunger pumps with complicated models have been put into the market, and they are playing an increasingly important role in the oil field. As the core component of the reciprocating linear motion of the plunger pump, the plunger is passed Convert the mechanical energy of the power end into the pressure energy of the liquid. At present, the domestic and foreign markets generally adopt a one-to-one corresponding structure of a diameter plunger corresponding to a pump head body. Once the output pressure and displacement of the on-site construction conditions change, it must be disassembled. Replacing the diameter plunger and pump head body of the hydraulic end of the corresponding plunger pump, on the one hand, the field op...

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Problems solved by technology

[0002] With the deepening of the country's development of the oil field, a large number of plunger pumps with complicated models have been put into the market, and they are playing an increasingly important role in the oil field. As the core component of the reciprocating linear motion of the plunger pump, the plunger is passed Convert the mechanical energy of the power end into the pressure energy of the liquid. At present, the domestic and foreign markets generally adopt a one-to-one corresponding structure of a diameter plunger corresponding to a pump head body. Once the output pressure and displacement of the on-site construction conditions change, it must be disassembled. Replacing the diameter plunger and pump head body of the hydraulic end of the corresponding plunger pump, on the one hand, the field operating conditions in the oil field are harsh, and dismantling the pump to replace accessories takes a lot of construction time, increasing the labor intensity of the operator, which is time-consuming and laborious; on the other hand, the pump head The body, plunger and seal assembly are equipped with a wide variety of accessories, which occupy a large amount of working capital

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