Automatic switching control circuit for standby water supply pump of circulating water supply system

Abstract

The utility model relates to a standby water supply pump automatic input control circuit of a circulating water supply system. The standby water supply pump automatic input control circuit comprises a power supply, a main water supply pump, a main water supply pump loop, a main water supply pump manual start-stop loop, a standby water supply pump, a standby water supply pump loop and a standby water supply pump automatic input loop. The power supply is electrically connected with corresponding phase lines of the main water supply pump loop and the standby water supply pump loop respectively, the main water supply pump loop and the standby water supply pump loop are connected with a main water supply pump M1 and a standby water supply pump M2 respectively, and the main water supply pump M1 is further connected with the main water supply pump manual start-stop loop; and the standby water supply pump M2 is connected with the standby water supply pump automatic input loop. The standby water supply pump can be automatically put into use when the main water supply pump of the circulating water supply system breaks down, and the problem that pipes cannot be continuously produced due to water pressure reduction of a water supply pipeline caused by instantaneous faults of the main water supply pump is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of control, and particularly relates to an automatic input control circuit for a standby water supply pump in a circulating water supply system. Background Art

[0002] The statements herein only provide background art related to the utility model and do not necessarily constitute prior art.

[0003] As an important chemical building material, plastic pipes have advantages such as excellent performance, hygiene, environmental protection, and low consumption, and are widely accepted by users. In the production process of plastic pipes, a reservoir circulating water supply system is often required to provide constant-pressure and low-temperature cooling water to realize the cooling and forming of plastic pipes.

[0004] As the power source of the reservoir circulating water supply system, the stable operation of the water supply pump can ensure the constant pipeline water pressure of the water supply system. The stable water pressure can guarantee the requirements of various quality data indicators of the produced pipes, and is one of the important links for the production line to produce qualified products. However, the operation of the water supply pump is easily affected by the operating environment and operating time, and it is prone to failures of the motor (such as bearing damage, stator winding aging, etc.) and the pump head (such as impeller wear, blockage, etc.), which in turn leads to the shutdown of the water supply pump, the decrease of the water pressure in the water supply pipeline, the inability to continuously produce pipes, and the increase of the rejection rate of the produced pipes. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an automatic input control circuit for a standby water supply pump in a circulating water supply system, which includes a power supply, a main water supply pump M1, a main water supply pump circuit, a main water supply pump manual start-stop circuit, a standby water supply pump M2, a standby water supply pump circuit, and a standby water supply pump automatic input circuit;

[0006] The power supply is electrically connected to the corresponding phase wire of the main water supply pump circuit, the main water supply pump circuit is connected to the main water supply pump, and the main water supply pump M1 is connected to the main water supply pump manual start-stop circuit;

[0007] The power supply is electrically connected to the corresponding phase wire of the standby water supply pump circuit, the standby water supply pump circuit is connected to the standby water supply pump; the standby water supply pump M2 is connected to the standby water supply pump automatic input circuit;

[0008] The main water supply pump manual start-stop circuit is connected in parallel with the standby water supply pump automatic input circuit, and an electric contact pressure gauge is arranged in the standby water supply pump automatic input circuit.

[0009] As a further technical solution, in the main water supply pump circuit, the power supply is electrically connected to the first air circuit breaker QF1, the first air circuit breaker QF1 is electrically connected to the main contacts KM1-3 of the first AC contactor, the main contacts KM1-3 of the first AC contactor are electrically connected to the main contacts FR1-1 of the first thermal relay, and the main contacts FR1-1 of the first thermal relay are electrically connected to the main water supply pump M1.

[0010] As a further technical solution, in the manual start / stop circuit of the main water supply pump, the power supply is electrically connected to the normally closed contact of the first stop button SB11. The normally closed contact of the first stop button SB11, the normally open contact of the start button SB1, the normally closed contact FR1-2 of the first thermal relay, and the coil KM1-1 of the first AC contactor are connected in series in sequence. The normally open contact KM1-2 of the first AC contactor is also connected in parallel with the start button SB1. The coil KM1-1 of the first AC contactor KM1-1 is electrically connected to the power supply.

[0011] As a further technical solution, in the standby water supply pump circuit, the power supply is electrically connected to the second air circuit breaker QF2, the second air circuit breaker QF2 is electrically connected to the main contacts KM2-3 of the second AC contactor, the main contacts KM2-3 of the second AC contactor are electrically connected to the main contacts FR2-1 of the second thermal relay, and the main contacts FR2-1 of the second thermal relay are electrically connected to the standby water supply pump M2.

[0012] As a further technical solution, in the automatic switch-on circuit of the standby water supply pump, the power supply is electrically connected to the normally closed contact of the second stop button SB2. The normally closed contact of the second stop button SB2, the lower limit contact of the electric contact pressure gauge, the normally closed contact FR2-2 of the second thermal relay, and the coil KM2-1 of the second AC contactor are connected in series in sequence. The normally open contact KM2-2 of the second AC contactor is connected in parallel with the electric contact pressure gauge. The coil KM2-1 of the second AC contactor is electrically connected to the power supply.

[0013] As a further technical solution, the main water supply pump circuit and the standby water supply pump circuit are connected in parallel.

[0014] As a further technical solution, the manual start / stop circuit of the main water supply pump and the automatic switch-on circuit of the standby water supply pump are also electrically connected to the power supply through the third circuit breaker QF3.

[0015] As a further technical solution, the power supply includes a three-phase power supply, the neutral zero line N of the transformer, and the ground wire PE.

[0016] Advantages of the above one or more technical solutions:

[0017] When the main water supply pump fails, the standby water supply pump can be automatically put into operation, improving the efficiency of emergency handling of equipment failures and reducing excessive manual intervention; avoiding the problem of production line shutdown caused by insufficient water supply pressure in the circulating water supply system when the main water supply pump fails, reducing the production of defective products caused by the failure of the main water supply pump, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The schematic diagram of the accompanying drawings forming a part of this application is used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation to this application.

[0019] Figure 1 It is a schematic diagram of the circuit principle of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following combines the attached Figure 1 to illustrate the specific implementation manners of this embodiment.

[0021] The embodiment of this application provides a control circuit for automatically putting into operation a standby water supply pump in a circulating water supply system. Referring to Figure 1 a control circuit for automatically putting into operation a standby water supply pump in a circulating water supply system, which includes a power supply, a main water supply pump M1, a main water supply pump circuit, a manual start-stop circuit of the main water supply pump, a standby water supply pump M2, a standby water supply pump circuit, and a circuit for automatically putting into operation the standby water supply pump; wherein, the power supply includes a three-phase power supply, the neutral line N of the transformer, and the ground wire PE. The three-phase power supply includes an L1 terminal, an L2 terminal, and an L3 terminal. The power supply is electrically connected to the corresponding phase wires of the main water supply pump circuit and the standby water supply pump circuit respectively. The main water supply pump circuit and the standby water supply pump circuit are respectively connected to the main water supply pump M1 and the standby water supply pump M2, wherein the main water supply pump M1 is also connected to the manual start-stop circuit of the main water supply pump; the standby water supply pump M2 is connected to the circuit for automatically putting into operation the standby water supply pump. And the main water supply pump circuit and the standby water supply pump circuit are in parallel, and the manual start-stop circuit of the main water supply pump and the circuit for automatically putting into operation the standby water supply pump are in parallel.

[0022] In this embodiment, the AC contactors KM used all include three contacts, namely the AC contactor coil KM-1, the normally open contact KM-2, and the main contact KM-3; the thermal relay FR includes the main contact FR-1 and the normally closed contact FR-2.

[0023] Further, in the main water supply pump circuit, the L1 terminal, L2 terminal, and L3 terminal of the three-phase power supply are electrically connected to the first air circuit breaker QF1 according to the corresponding phase wires. The first air circuit breaker QF1 is electrically connected to the main contacts KM1-3 of the first AC contactor. The main contacts KM1-3 of the first AC contactor are electrically connected to the main contacts FR1-1 of the first thermal relay. The main contacts FR1-1 of the first thermal relay are electrically connected to the main water supply pump M1. The main water supply pump M1 is also electrically connected to the grounding wire PE of the power supply.

[0024] In the manual start-stop circuit of the main water supply pump, the L1 terminal of the three-phase power supply is also electrically connected to the normally closed contact of the first stop button SB11. The normally closed contact of the first stop button SB11, the normally open contact of the start button SB1, the normally closed contact FR1-2 of the first thermal relay, and the coil KM1-1 of the first AC contactor are connected in series in sequence. The normally open contact KM1-2 of the first AC contactor is also connected in parallel with the start button SB1. The coil KM1-1 of the first AC contactor is electrically connected to the neutral zero line N of the transformer of the power supply.

[0025] Further, in the standby water supply pump circuit, the L1 terminal, L2 terminal, and L3 of the three-phase power supply are electrically connected to the second air circuit breaker QF2 according to the corresponding phase wires. The second air circuit breaker QF2 is electrically connected to the main contacts KM2-3 of the second AC contactor. The main contacts KM2-3 of the second AC contactor are electrically connected to the main contacts FR2-1 of the second thermal relay. The main contacts FR2-1 of the second thermal relay are electrically connected to the standby water supply pump M2. The standby water supply pump M2 is electrically connected to the grounding wire PE of the power supply.

[0026] In the automatic input circuit of the standby water supply pump, the L1 terminal of the three-phase power supply is electrically connected to the normally closed contact of the second stop button SB2. The normally closed contact of the second stop button SB2, the lower limit contact of the electric contact pressure gauge, the normally closed contact FR2-2 of the second thermal relay, and the coil KM2-1 of the second AC contactor are connected in series in sequence. The normally open contact KM2-2 of the second AC contactor is also connected in parallel with the electric contact pressure gauge. The coil KM2-1 of the second AC contactor is electrically connected to the neutral zero line N of the transformer of the power supply.

[0027] Further, between the manual start-stop circuit of the main water supply pump and the automatic input circuit of the standby water supply pump, it is also electrically connected to the L1 terminal of the three-phase power supply through the third circuit breaker QF3.

[0028] The working principle of the circuit provided in this embodiment is as follows:

[0029] When the pipe is in normal production, press the start button SB1 in the manual start-stop circuit of the main water supply pump, so that the normally open contact KM1-2 of the first AC contactor is self-locked and closed. Then, the coil KM1-1 of the first AC contactor is energized, causing the main contact KM1-3 of the first AC contactor to be attracted and closed, and the main water supply pump M1 starts to run.

[0030] When the main water supply pump fails, the first thermal relay FR1 operates to disconnect the normally closed contact FR1-2 of the first thermal relay. The coil KM1-1 of the first AC contactor loses power, and then the main contact KM1-3 of the first AC contactor is disconnected, causing the main water supply pump M1 to stop running, which can prevent the motor of the main water supply pump M1 from burning out. After the main water supply pump M1 stops running, due to the decrease in the water pressure in the water supply pipeline, the check valve at the outlet of the main water supply pump M1 closes immediately to avoid continuous loss of the water pressure in the water supply pipeline. At the same time, due to the decrease in the water pressure in the water supply pipeline, the lower limit contact of the electric contact pressure gauge in the automatic input circuit of the standby water pump closes, which in turn causes the normally open contact KM2-2 of the second AC contactor to be self-locked and closed. The coil KM2-1 of the second AC contactor in the automatic input circuit of the standby water pump is energized, causing the main contact KM2-3 of the second AC contactor to be attracted and closed, and the standby water supply pump M2 starts to run. Since there will also be a water pressure difference inside the main water supply pipeline and the standby water supply pump M2, the check valve in the pipeline at the outlet of the standby water supply pump M2 opens immediately to maintain the pressure of the main water supply pipeline during normal water supply.

[0031] Utilizing the low latency of the first thermal relay in the main water supply pump circuit and the manual start-stop circuit of the main water supply pump, as well as the second thermal relay in the standby water supply pump circuit and the automatic input circuit of the standby water supply pump during the operation process, seamless connection between the main water supply pump and the standby water supply pump can be achieved, ensuring the stable water pressure in the main water supply pipeline. When the main water supply pump fails, the standby water supply pump can be automatically put into operation, improving the emergency handling efficiency of equipment failures, avoiding the production line shutdown problem caused by insufficient water supply pressure in the circulating water supply system when the main water supply pump fails, reducing the production of defective products caused by the failure of the main water supply pump, and lowering the production cost.

[0032] Although the specific implementation manners of the present invention are described above in conjunction with the drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made without creative labor by those skilled in the art are still within the protection scope of the present invention.

Claims

1. A circulating water supply system standby water supply pump automatic input control circuit, characterized in that: Including power supply, main water supply pump, main water supply pump circuit, main water supply pump manual start and stop circuit, standby water supply pump, standby water supply pump circuit and standby water supply pump automatic start circuit; The power supply is electrically connected to the corresponding phase line of the main water supply pump circuit, the main water supply pump circuit is connected to the main water supply pump, and the main water supply pump is connected to the manual start and stop circuit of the main water supply pump; The power supply is electrically connected to the corresponding phase line of the backup water supply pump circuit, the backup water supply pump circuit is connected to the backup water supply pump; the backup water supply pump is connected to the backup water supply pump automatic input circuit; The manual start-stop circuit of the main water supply pump is connected in parallel with the automatic start-up circuit of the backup water supply pump, and an electric contact pressure gauge is arranged in the automatic start-up circuit of the backup water supply pump.

2. The automatic start-up control circuit of the backup water supply pump of the circulating water supply system according to claim 1, characterized in that: In the main water supply pump circuit, the power supply is electrically connected to the first air circuit breaker QF1, the first air circuit breaker QF1 is electrically connected to the main contact KM1-3 of the first AC contactor, the main contact KM1-3 of the first AC contactor is electrically connected to the main contact FR1-1 of the first thermal relay, and the main contact FR1-1 of the first thermal relay is electrically connected to the main water supply pump M1.

3. The automatic start-up control circuit of the backup water supply pump of the circulating water supply system according to claim 1 is characterized in that: In the manual start-stop circuit of the main water supply pump, the power supply is electrically connected to the normally closed contact of the first stop button SB11, the normally closed contact of the first stop button SB11, the normally open contact of the start button SB1, the normally closed contact FR1-2 of the first thermal relay and the coil KM1-1 of the first AC contactor are connected in series in sequence, the normally open contact KM1-2 of the first AC contactor is also connected in parallel with the start button SB1, and the coil of the first AC contactor KM1-1 is electrically connected to the power supply.

4. The automatic start-up control circuit of the backup water supply pump of the circulating water supply system according to claim 1 is characterized in that: In the backup water supply pump circuit, the power supply is electrically connected to the second air circuit breaker QF2, the second air circuit breaker QF2 is electrically connected to the main contact KM2-3 of the second AC contactor, the main contact KM2-3 of the second AC contactor is electrically connected to the main contact FR2-1 of the second thermal relay, and the main contact FR2-1 of the second thermal relay is electrically connected to the backup water supply pump M2.

5. The automatic start-up control circuit of the backup water supply pump of the circulating water supply system according to claim 1, characterized in that: The standby water supply pump is automatically put into the circuit, and the power supply is electrically connected to the normally closed contact of the second stop button SB2. The normally closed contact of the second stop button SB2, the lower limit contact of the electric contact pressure gauge, the normally closed contact FR2-2 of the second thermal relay and the coil KM2-1 of the second AC contactor are connected in series in sequence, the normally open contact KM2-2 of the second AC contactor is connected in parallel with the electric contact pressure gauge, and the coil KM2-1 of the second AC contactor is electrically connected to the power supply.

6. The automatic start-up control circuit for the backup water supply pump of a circulating water supply system according to claim 1, characterized in that: The main water supply pump circuit and the standby water supply pump circuit are connected in parallel.

7. The automatic start-up control circuit for the backup water supply pump of a circulating water supply system as claimed in claim 1, characterized in that: The manual start-stop circuit of the main water supply pump and the automatic start-up circuit of the standby water supply pump are also electrically connected to the power supply through the third circuit breaker QF3.

8. The automatic start-up control circuit for the backup water supply pump of a circulating water supply system as claimed in claim 1, characterized in that: The power supply includes a three-phase power supply, a transformer neutral point zero line N and a grounding line PE.

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