Water pump

Abstract

The invention belongs to the technical field of water pumps, and discloses a water pump. The water pump comprises a pump body, an eccentric shaft, a driving wheel, plungers and pistons. A water inlet,a water outlet, an opening P and an opening T are formed in the pump body, a plurality of piston cavities are formed in the pump body, the pistons are located in the piston cavities and can slide back and forth, the interiors of the piston cavities are divided into oil cavities and water cavities; the oil cavities alternately communicates with the opening P and the opening T, the water cavities alternately communicates with the water inlet and the water outlet, the outer surface of the driving wheel is a regular polygon, the driving wheel sleeves the eccentric section of the eccentric shaft and can perform relative sliding in the circumferential direction, one ends of the plungers are connected with the pistons, the other ends of the plungers are in sliding contact with the outer surfaceof the driving wheel, during the rotation of the eccentric shaft, and the communication relationship between the opening P and the opening T and different oil cavities and the communication relationship between the water inlet and the water outlet and the different water cavities are switched. The water pump can perform continuous compression acting of water mediums under hydraulic pressure, is simple in structure and low in cost, the use of a motor and an impeller is saved, the working temperature is reduced, and long-term continuous work is achieved.

Description

Technical field [0001] The invention belongs to the technical field of water pumps, and particularly relates to a circulating water pump. Background technique [0002] At present, in the fire rescue of high-rise buildings, the height of the water supply depends on the higher pressure generated by the water pump. Among them, in the prior art, for example, the Chinese invention patent with the application number 201110273482.4 and the name "plunger type high pressure water pump system and its high and low pressure mode switching method", the disclosed high pressure water pump is a column driven by a double piston cylinder The plug high-pressure water pump system can produce a pressure of more than 10MPa, and the theoretical water supply height can reach 900 meters or even higher, so as to meet the supply of fire-fighting water sources for super high-rise buildings. [0003] However, the water pump in the prior art is usually composed of an oil cylinder and a water cylinder, and uses...

AI Technical Summary

Problems solved by technology

The water pump with this structure is not only bulky and the pipeline connection is complicated, but also the sensor is controlled by the proximity switch for the reversing of the oil cylinder, which makes the reversing unstable and unreliable.

At the same time, since the control circuit part of the reversing device is controlled by a circuit board, and most of the circuit boards are non-standard parts, it is not only difficult to manufacture and process, but also very difficult to repair after damage

In addition, in the process of using the existing electromagnetic commutation device, if it is continuously energized for a long time, it is easy to damage small devices, so that it cannot meet the requirements of long-term energization, affecting the continuity and efficiency of work

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