Automatic partial pressure double gear pump

Abstract

The invention discloses a pressure distribution control dual gear pump, which belongs to a dual gear pump and aims to provide a dual gear pump which can balance loads at different stages. The pressure distribution control dual gear pump comprises two-stage gear pumps and a differential pressure adjusting device (7), wherein the two-stage gear pumps are connected in series; the differential pressure adjusting device (7) is formed by a piston (7-10) and a spring (7-1) which are positioned in a shell (7-2); a first oil port (7-3), a second oil port (7-5), a third oil port (7-7) and a fourth oil port (7-8) are formed in the shell (7-2), and two ring grooves are formed in the piston (7-10); the first oil port (7-3) and the second oil port (7-5) are respectively connected to the inlet end of the first-stage gear pump (2), a high-pressure cavity (7-6) and a fourth oil port (7-8) are respectively connected to the outlet end of the second-stage gear pump (5), and a low-pressure cavity (7-11) and the third oil port (7-7) are respectively connected to an oil way between the first-stage gear pump (2) and the second-stage gear pump (5). The dual gear pump has the advantages of stability in operation, long service life, high speed, high pressure and large flow.

Description

technical field [0001] The invention relates to a duplex gear pump, in particular to an automatic pressure dividing type duplex gear pump. Background technique [0002] As we all know, the duplex gear pump is composed of two-stage gear pumps in series; it has the characteristics of high speed, high pressure, and large flow. However, due to the incomplete matching between the two-stage gear pumps, the flow difference between the two-stage pumps leads to unbalanced loads of the two-stage pumps, which easily causes instantaneous pressure pulses to increase and cause damage to the one-stage pump with a large load. , resulting in a reduction in the life of the entire cascade pump. In addition, at the initial stage of starting, the two-stage gear pumps rotate at the same time; at this time, the oil pressure relationship between the two-stage gear pumps has not been established, so the gears of the second-stage pump are dry friction and easy to be damaged. Contents of the invent...

AI Technical Summary

Problems solved by technology

However, due to the incomplete matching between the two-stage gear pumps, the flow difference between the two-stage pumps leads to unbalanced loads of the two-stage pumps, which easily causes instantaneous pressure pulses to increase and cause damage to the one-stage pump with a large load. , resulting in reduced lifetime of the entire cascade pump

In addition, at the initial stage of starting, the two-stage gear pumps rotate at the same time; at this time, the oil pressure relationship between the two-stage gear pumps has not been established, so the gears of the second-stage pump are dry friction and easy to damage

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