Plate-type heat exchanger unit

Abstract

A plate-type heat exchanger unit comprises a plate-type heat exchanger, a circulation water pump and a standby circulation water pump. The plate-type heat exchanger comprises a first medium inlet, wherein a water supply pipeline and a standby water supply pipeline are connected to the first medium inlet in parallel. The circulation water pump is arranged in the water supply pipeline. An electric butterfly valve is arranged between the circulation water pump and the first medium inlet. The standby circulation water pump is arranged in the standby water supply pipeline. A standby electric butterfly valve is arranged between the standby circulation water pump and the first medium inlet. The control end of an electric actuator on the electric butterfly valve and the control end of an electric actuator on the standby electric butterfly valve are both connected with a controller. The control end of the circulation water pump and the control end of the standby circulation water pump are both connected with the controller. The electric butterfly valves are adopted to control the pipelines, starting and closing are convenient, labor is saved, fluid resistance is small, the starting and closing speed is lower than that of a check valve, the water hammer phenomenon can be avoided, and at the same time, high-pressure water at outlets of the water pumps can be well blocked off. The electric butterfly valves are the same as manual butterfly valves in fluid resistance, resistance can be reduced for a system, and operation cost is lowered.

Description

Technical field: [0001] The invention relates to the mechanical field, in particular to a heat exchange device, in particular to a plate heat exchange unit. Background technique: [0002] Plate heat exchangers are widely used in industrial fields. In the prior art, two circulation pumps are arranged in the plate heat exchange unit, and when one of the circulation pumps is working, the other circulation pump is in standby. A ball valve is set at the interface between the plate heat exchange unit and the external pipeline for shut-off control. The inlet and outlet of the water pump are equipped with manual butterfly valves. The outlet of the circulating pump in the unit is equipped with a check valve to prevent the impact of high-pressure water backflow on the impeller of the pump. During the operation of the system, due to various reasons, the circulating water pump will stop running suddenly, the pressure in the pump will disappear, and the high-pressure water connected to ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a plate heat exchange unit, which can solve the water hammer caused by using manual butterfly valve and check valve to control the water flow at the inlet and outlet of the water pump in the plate heat exchange unit in the prior art Phenomenon and technical problems with large pressure loss

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