Power system of water pump for long-distance water supply trucks and long-distance water supply truck provided with system

Abstract

The invention relates to the field of long-distance water supply trucks. Aiming at the problems that in the prior art, a power system of a water pump is complex in structure, huge in volume and large in energy loss, and the pump is easy to damage, the invention provides a power system which comprises an engine, a proportional displacement variable pump, a security / unloading valve, a switching valve, a hydraulic motor, a filter, an oil tank and a hydraulic oil pipeline, wherein the proportional displacement variable pump is driven by the engine, the security / unloading valve and the switching valve are connected with an oil outlet of the proportional displacement variable pump and connected in parallel to each other, and the hydraulic motor is connected with an outlet of the switching valve and drives a water pump; when the switching valve is closed and the security / unloading valve plays a role of an unloading valve, an oil feeding pipeline of the hydraulic motor is closed; and when the switching valve is opened and the security / unloading valve plays a role of a security valve, the rotating speed of the hydraulic motor finally controls the rotating speed of the water pump through adjusting the displacement of the proportional displacement variable pump, and then the working condition of the water pump is adjusted. Through the adoption of the proportional displacement variable pump, the displacement of the proportional displacement variable pump can be automatically adjusted according to a preset program based on the changes of the working condition, thus the technical problems in the prior art are solved.

Description

technical field [0001] The invention relates to the field of remote water supply vehicles, in particular to a power system for a water pump of a remote water supply vehicle. Background technique [0002] Remote water supply vehicles will play an important role in the fight against various major disasters such as fire fighting, emergency water supply and urban drainage. Therefore, remote water supply vehicles are highly valued by various countries and governments at all levels, and have a broad market. In the remote water supply vehicle, the power system of the water pump is one of the key components. There are two main power systems for the water pumps of existing remote water supply vehicles. One is the electric power system composed of diesel engine-generator-motor, that is, the diesel engine drives the generator to generate electricity, and then supplies the electric motor to drive the water pump to absorb water. The power system of this kind The main disadvantages are ...

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Problems solved by technology

[0003] In order to solve the problems caused by the power system of the water pump in the prior art, that is, the structure is complex, the volume is large, the layout is not flexible, or the energy loss is large, and the hydraulic pump is easily damaged. The proportional displacement variable pump driven by the engine, the safety unloading valve and the on-off valve connected to the oil outlet of the proportional displacement variable pump in parallel, the hydraulic motor connected to the outlet of the on-off valve and driving the water pump, the filter device, oil tank and hydraulic oil pipeline; when the on-off valve is closed and the safety unloading valve acts as an unloading valve, the oil inlet pipeline of the hydraulic motor is closed; when the on-off valve is opened and the safety unloading valve acts as a safety valve When functioning, the rotational speed of the hydraulic motor finally controls the rotational speed of the water pump by adjusting the displacement of the proportional displacement variable pump, thereby adjusting the working condition of the water pump.

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