Two-control multi-constant-pressure water supply equipment control system and control method thereof

Abstract

The invention discloses a water supply equipment control system. The system comprises a plurality of water pumps, two frequency converters, a control unit, a switching group and a water pressure sensor; the control ends of the two frequency converters are connected to the control unit, and the output ends of the two frequency converters are connected to a node A; the input end of each water pump is connected with the switching group, and the switching group is respectively connected with the control unit and the node A; the control unit controls the operation of the switching group; the switching group controls conduction or cut-off of the input ends of the water pumps and the node A; and the water pressure sensor is connected with the control unit and used for detecting the water outlet pressure of a water using point. The invention also discloses a control method of the water supply equipment control system. The system has the advantages of realizing soft start and soft stop of the water pumps, eliminating the impact current when the water pumps are started, avoiding water hammer effect, stabilizing the water supply pressure, prolonging the service life and the reliability of the equipment and better ensuring the water using safety of a user.

Description

technical field [0001] The invention relates to a water supply equipment control system and a control method thereof, in particular to a two-control multi-constant-pressure water supply equipment control system and a control method thereof. Background technique [0002] Among the existing constant-pressure water supply equipment, there is a technology that uses a frequency converter to control multi-pump circulating constant-pressure water supply. The electrical design of the system is very mature, and its control methods are one control two, one control three, ..., one control n ( n is the number of water pumps), referred to as "one control many". Its notable feature is that the control system only includes one frequency converter, and the number of water pumps controlled by it depends on the water supply scale and capacity of the water supply equipment. Usually there are two, three or more water pumps. [0003] One-control-multiple-control mode usually adopts the followin...

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Problems solved by technology

[0008] 2. The impact on the water outlet pressure: when increasing or decreasing the power frequency pump, the water supply pressure of the equipment cannot achieve a smooth transition. When increasing the power frequency pump, it will inevitably cause an impact on the water supply pressure

[0009] 3. Impact on water safety: Because the system has only one frequency converter, if the frequency converter fails for some reason, if the site needs to restore normal water supply, it will take at least two or three days, and at most four or five days, which will affect water safety.

[0010] 4. Impact on energy consumption: When the flow rate increases and two pumps are used at the same time, the operation mode of one work and one change will reduce the operating efficiency of the pump set and increase energy consumption

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