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Function technology of gear pump instead of plunger pump for truck mounted construction machinery

Update Date: 2015/12/3 comes from: jyrcpr.cn Author: clicks:


Related Xugong truck crane The engineering machinery gear pump instead of plunger pump function technology is limited by the fixed displacement structure. It is generally believed that gear pump can only be used as constant flow hydraulic source. However, the annex threaded connection combined valve scheme is effective for improving its function, reducing system cost and improving system reliability. Therefore, the performance of the gear pump can be close to the expensive and complex plunger pump.

For example, direct installation of the control valve on the pump can save the pipeline between the pump and the direction, thus controlling the cost. Less pipe fittings and connectors can reduce leakage and improve working reliability. Moreover, the pump itself installs the valve to reduce the circulation pressure of the loop and improve its performance. Below are some circuits that can improve the basic functions of gear pumps, some of which are practical and proven basic circuits, while others are innovative research.

The unloading element will be combined with the small power single pump in the large discharge pump. The liquid is discharged from the outlet of the two pumps to achieve a predetermined pressure and / or flow rate. At this time, the large flow pump circulated the flow from its outlet to the inlet, thus reducing the output flow of the pump to the system, and reducing the magnetic power to a little higher than that required by the high-pressure part. The percentage of flow reduction depends on the ratio of the undischarged displacement to the total displacement. The combined or threaded connection unloading valve reduces or even eliminates pipelines, holes and auxiliaries and other possible leakage.

The simplest unloading elements are manually controlled. The spring enables the unloading valve to be connected or closed. When the valve is operated, the valve's on-off state is well switched. Lever or other mechanical mechanism is the simplest way to operate this valve.

The pilot control (pneumatic or hydraulic) unloading valve is an improvement of the operation mode, because the valve can be remotely controlled. The biggest progress is the electromagnetic valve controlled by electrical or electronic control. It can be used not only for remote control but also for automatic control by microcomputer. It is usually considered that the simple unloading technology is the best application.

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