A pressure-compensated end-face oil-distribution double-row radial piston variable pump with annular piston

Abstract

A pressure-compensated end-face oil-distribution double-row radial piston variable pump with annular pistons, including a transmission shaft on which two cylinders are installed side by side, one cylinder has an annular groove and is equipped with a pressure-compensated annular piston , a row of radial plunger holes are opened in parallel on the outer surface of the cylinder body, and a plunger is installed on each plunger hole, and a return spring is installed between the plunger hole and the bottom of the plunger, and the plunger Sliding shoes are installed on the top, and the top of the sliding shoe is pressed against the inner ring of the needle roller bearing fixed on the inner ring of the stator. The upper and lower sides of the stator are pressed by variable pistons, and the left and right sides are pressed by friction blocks, which pass through the pump. The end cover is pressed and positioned, and the variable piston is symmetrically installed in the round hole of the intermediate housing, and the boss outside the round hole of the intermediate housing is equipped with a variable end cover, and the variable end cover and the variable piston are respectively compressed. With a variable spring, the invention works stably and has strong continuous working ability, and has the advantages of no axial force and 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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