Method for serially connecting a plurality of water pumps by using hoses

Abstract

The invention relates to a method for serially connecting a plurality of water pumps by using hoses and belongs to the field of a non-positive displacement pump. An emptying valve and a pressure sensor are arranged on a water pump water inlet pipe; an electromagnetic valve is arranged on the emptying valve; a signal output end of the pressure sensor is connected with a signal input end of a control unit; a signal output end of the control unit is connected with a control input end of the electromagnetic valve; water inlet and outlet pipes of at least two water pumps are correspondingly connected by using the hoses; a water outlet pipe port of a preceding stage pump is correspondingly connected with a water inlet pipe port of a succeeding stage pump; during operation of the water pumps, the control unit monitors water inlet pressure of the succeeding stage pump through the pressure sensor; when the water inlet pressure of the succeeding stage pump is lower than a pressure set value, the control unit controls the electromagnetic valve to open the emptying valve to automatically supplement air and pressure for the water inlet pipe of the succeeding stage pump, so that negative pressure working conditions of the water inlet pipe of the succeeding stage pump can be removed, and the hoses are prevented from being sucked by the water inlet of the succeeding pump; by means of the method, an operation mode of serially connecting the multi-stage pumps by using the hoses is achieved; the method can be widely applied to the field of design and manufacture of a movable water pump.

Description

technical field [0001] The invention belongs to the field of non-variable pumps, in particular to a pumping device or system using multiple water pumps connected in series. Background technique [0002] A pump is a machine that transports or pressurizes a liquid. It transmits the mechanical energy of the prime mover or other external energy to the liquid to increase the energy of the liquid. It is mainly used to transport liquids, and can also transport liquids, gas mixtures, and liquids containing suspended solids. [0003] The head of a water pump (in meters, refers to the energy obtained by the unit weight of the fluid through the pump) has a certain limit, and the head of the pump depends on the structure of the pump (such as the diameter of the impeller, the curvature of the blade, etc.) , speed, and the pressure on the pump are generally determined by experimental methods. [0004] In actual operation, multiple pumps are usually connected in series (also known as mul...

AI Technical Summary

Problems solved by technology

[0010] However, in the actual emergency operation, more cases are encountered in the emergency operation environment where hard pipe connection between multi-stage water pumps cannot be used; Walls and flood control dams suddenly partially collapsed, and it was necessary to use water pumps to transport the accumulated water in the cofferdam to a distance of several kilometers for discharge. Due to the long transportation distance, it was only possible to adopt the form of multi-stage water pump relay transportation. However, due to the surrounding operating environment Due to restrictions (intensive buildings in residential areas, narrow roads, inconvenient transportation, etc.), it is actually difficult to transport a large number of hard pipes to the job site for laying. At this time, the easiest operation solution is to use hoses Connection between multi-stage pumps

[0011] Due to the aforementioned reasons, the water pressure difference (unbalance) between the front and back pumps will cause the suction pipe phenomenon and the phenomenon of bursting pipes or pipe joints, resulting in damage to the water pump. Therefore, under the current technical conditions, it is impossible to connect the water pumps in series with a hose.

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