A dual-pump alternate start-stop control circuit

A technology of start-stop control and dual water pumps, which is applied in pump control, liquid variable capacity machinery, machine/engine, etc., can solve the problems of high cost, high PLC price, and high PLC application threshold, and achieve low cost and low failure rate , maintenance simple effect

CN110145460BActive Publication Date: 2020-08-07STATE GRID CORP OF CHINA +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-08-07

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Abstract

The invention provides a control loop for alternatively starting and stopping double water pumps. The control loop for alternatively starting and stopping the double water pumps is formed by an alternating current power supply, an air switch, an alternating current contactor, a thermal relay, the water pumps, an alternating current relay, a rotary switch, a thermal relay contact, a water level switch and the like according to a specific connecting manner. The control loop for alternatively starting and stopping the double water pumps comprises a main loop and a load control loop, wherein the load control loop at least comprises a manual start and stop loop, an automatic start and stop loop, a fault switching loop, an automatic switching signal loop and a starting and stopping signal loop;by utilizing a logical relationship between the relays and auxiliary contacts, the operation of the two water pumps at a manual mode and an automatic mode can be controlled, so that the two water pumps can be alternatively and automatically started and stopped according to a water level; and the control loop is ingenious in design, simple, practical, low in cost, and convenient to maintain.
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Description

technical field

[0001] The invention relates to a dual-water pump rotation start-stop control circuit, and the technology is applicable to various dual-water pump automatic control occasions.

[0002] technical background

[0003] The automatic start and stop device of the water pump is used in various production industries. Using the automatic control circuit, according to the water level, the water pump is automatically started to replenish water and drain water. In practical applications, two water pumps are generally designed, which can be started and stopped manually, and automatically.

[0004] At present, PLC control is generally used for the control circuit of double water pump rotation start and stop. Through PLC programming, it is very easy to realize the functions of automatic rotation start and stop of two water pumps according to the water level, and fault switching. The following problems exist in the PLC-based dual pump rotation start-stop control loop: 1. The...

Examples

Embodiment Construction

[0019] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings

[0020] A dual-pump alternation start-stop control loop includes a main loop and a load control loop, wherein the load control loop includes a manual start-stop loop, an automatic start-stop loop, a fault switching loop, an automatic switching signal loop, and a start-stop signal loop.

[0021] Such as figure 1 As shown, the main circuit includes 380V AC. 1 The power supply is connected to the No. 1 pump motor through QF1 power air switch No. 2, KM1 contactor No. 1 pump. 4, FR1 thermal relay No. 1 pump. 380V AC power supply. 1. No. 2 pump through QF2 power air switch. 3. No. 2 pump of KM2 contactor. 5. FR2 thermal relay No. 2 pump. 7. Connected to No. 2 pump motor. QF1 power supply switch No.1 pump.2 closes, KM1 contactor No.1 pump.4 closes, No.1 pump motor.8 runs, if there is a motor failure, FR1 thermal relay No.1 pump.6 action disconnects, N...