Pressure compensation type end face oil distribution double-row radial plunger variable pump with annular piston

Abstract

The invention discloses a pressure compensation type end face oil distribution double-row radial plunger variable pump with an annular piston. The plunger variable pump comprises a transmission shaft. The transmission shaft is provided with two cylinder bodies in parallel. One cylinder body is provided with an annular groove and the pressure compensation annular piston. A row of radial plunger holes are formed in the outer circular surface of each cylinder body in parallel. Each plunger hole is provided with a plunger. A return spring is installed between the bottom of each plunger hole and the bottom of the corresponding plunger. Each plunger is provided with a piston shoe. The tops of the piston shoes are pressed on the inner circles of needle bearings fixed to the inner circles of stators. The upper side and lower side of one stator are compressed by variable pistons, and the left side and right side of the stator are compressed by friction blocks. The friction blocks are compressed and positioned through pump end covers. The variable pistons are symmetrically installed in a circular hole of a middle shell. Variable end covers are correspondingly installed on a boss located outside the circular hole of the middle shell. Variable springs are compressed between the variable end covers and the variable pistons. The pressure compensation type end face oil distribution double-row radial plunger variable pump with the annular piston has the advantages of being stable to work, high in continuous operational capability, free of axial force and capable of achieving automatic hydraulic compensation.

Description

technical field [0001] The invention belongs to the technical field of radial plunger pumps, and in particular relates to a pressure-compensating end face oil distribution double-row radial plunger variable pump with annular pistons. Background technique [0002] Radial piston pumps are widely used in practice. At present, there are mainly two flow distribution methods of radial piston pumps, including axial flow distribution and check valve flow distribution. For shaft distribution pumps, it is necessary to process multiple axial holes and radial grooves on the distribution shaft, which reduces the strength of the shaft and increases the processing complexity. The distribution shaft and the support shaft are separated into two parts, and the supporting method is complicated. At present, the common distribution shafts are all cantilever structures, which will vibrate and bend during operation, which is not conducive to the long-term continuous operation of the pump. In addi...

AI Technical Summary

Problems solved by technology

For shaft distribution pumps, it is necessary to process multiple axial holes and radial grooves on the distribution shaft, which reduces the strength of the shaft and increases the processing complexity. The distribution shaft and the support shaft are separated into two parts, and the supporting method is complicated. At present, the common distribution shafts are all cantilever structures, which will vibrate and bend during operation, which is not conducive to the long-term continuous operation of the pump. In addition, the existing methods of oil distribution through fixed positions, such as shaft distribution, do not compensate for wear The method, when the long-term wear and tear will increase the leakage

For the flow distribution of the one-way valve, the pressure or vacuum of the inner cavity of the pump acts on the one-way valve to open or close the valve. The spring element is also more difficult to design, and prone to fatigue damage

[0003] In view of the above-mentioned deficiencies in the axial flow distribution and one-way valve flow distribution methods of the radial piston pump, it is proposed in the patent No. CN104358664A "A double-row radial piston pump with no axial force and oil distribution on the end face" The end face flow distribution method similar to the axial plunger pump is proposed, but the patent still has the following shortcomings: the structure of eliminating the axial force through the symmetrical arrangement of two flow distribution plates is relatively complicated; the installation groove of the plunger return retaining ring The processing is difficult; the wear between the stator and the sliding shoe is relatively large, which is not conducive to the continuous operation of the pump for a long time

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