Valve-group reversing type gear pump

Abstract

The invention discloses a valve-group reversing type gear pump comprising a valve body (1), a pump body (2), a driving gear (3) and a driven gear (4), wherein four valves (11) are arranged in the valve body (1) and are sleeved on respective valve rods (12), and the valves (11) and the valve body (1) are in a conical surface match. In the invention, the four valves with the same structures are integrated by the valve body to complete the automatic reversing function of an internal flow passage when the gear pump rotates forwards and backwards so that an oil inlet and an oil outlet always remain unchanged. When in use, the valves are opened and closed in linear motion, the valves and the valve body in a conical surface match, and the valve-group reversing type gear pump has simple structure and good seal performance.

Description

technical field [0001] The invention belongs to the field of gear pumps, specifically a gear pump with forward and reverse rotation, but its oil inlet and oil outlet remain unchanged. Background technique [0002] The most basic form of a gear pump is that two gears of the same size mesh with each other and rotate in a tightly fitted casing. The inside of the casing is similar to an "8" shape, and the two gears are installed inside. The housing is a tight fit. Oil enters the middle of the two gears from the suction port, fills the space, moves along the housing with the rotation of the teeth, and finally discharges when the two teeth mesh. The gear pump is also called a positive displacement device, which is like a piston in a cylinder. When one tooth enters the fluid space of another tooth, the oil is mechanically squeezed out. Because liquids are incompressible, oil and teeth cannot occupy the same space at the same time. [0003] The traditional reversing gear pump is ...

AI Technical Summary

Problems solved by technology

[0004] 1. The opening and closing of the "loose-leaf" reversing valve is a rotational movement, the opening angle is limited, the sealing surface of the valve is flat, the leakage is large, and the volumetric efficiency is low

[0005] 2. The "loose-leaf" reversing valve structure requires a large spring torsion force, and the open state of the valve needs to consume a large amount of power when it is working.

[0006] 3. The "loose-leaf" reversing valve has a complex structure, high dimensional accuracy, shape and position tolerance requirements, and difficult processing

[0007] 4. The structure of the pump body is complex, and additional flow channels need to be installed outside, which is large in size, heavy in weight, difficult in casting and processing

Images