Deep-well casting diesel engine standby power failure automatic switching device

Abstract

The utility model discloses a kind of deep well casting diesel engine standby power power failure automatic switching device, including system power QF1, generator power QF2, main power contactor KM1, generator contactor KM2, system start button SB1, casting machine stop button SB2 and generator start button SB3;When system failure power off, generator start signal is connected into main power contactor KM1 normally closed contact, main power contactor KM1 normally closed contact is connected under system power-off condition, start generator works, after two seconds of generator start, start signal is disconnected by being connected into generator contactor KM2 delay disconnecting contact and disconnecting start signal, generator enters power generation state and supplies power to load, realize total power power failure after automatically starting diesel generator power supply, shorten the time of starting generator to supply power to equipment after power failure, reduce the probability of accident occurrence, guarantee equipment stable production, avoid the occurrence of safety accident caused by system power failure.

Description

Technical Field

[0001] This utility model relates to the field of power distribution switching equipment, specifically to an automatic switching device for backup power supply failure of a deep well casting diesel engine. Background Technology

[0002] In deep-well casting workshops, to strengthen safety management and reduce the risk of accidents in aluminum processing and deep-well casting enterprises, the state has formulated the "Seven Regulations on Aluminum Management." One of these regulations requires that hoisting systems be equipped with emergency power supplies. Currently, the emergency power supply is a diesel generator backup power supply. In the event of a power failure, operators must travel to the diesel generator location on-site to manually start it, which carries a significant risk of aluminum molten metal explosion. Therefore, there is an urgent need for an automatic power switchover device to automatically start the diesel generator after a power failure, thereby reducing the accident rate and alleviating the workload of operators traveling to and from the site to start the generator. Utility Model Content

[0003] This utility model provides an automatic power switching device for backup power supply of a deep well casting diesel engine. The purpose is to automatically start the generator to supply power after the main power supply fails, so as to ensure the smooth shutdown of the equipment and avoid the occurrence of safety accidents.

[0004] To achieve its purpose, this utility model adopts the following technical solution:

[0005] An automatic power switching device for a backup power supply of a diesel engine in deep well casting includes a system power supply QF1, a generator power supply QF2, a main power contactor KM1, a generator contactor KM2, a system start button SB1, a casting machine stop button SB2, and a generator start button SB3.

[0006] The input terminal of the system power switch QF1 is connected to the system power supply, and the output terminal is connected to the input terminal of the main power contactor KM1. The output terminal of the main power contactor KM1 is connected to the casting machine power supply. Phase B of the system power supply QF1 is connected to the normally closed contact of the generator contactor KM2. The normally closed contact of the generator contactor KM2 is connected to the casting machine stop button SB2. The casting machine stop button SB2 is connected to the normally open contact of the main power contactor KM1. The normally open contact of the main power contactor KM1 is connected to the coil of the main power contactor KM1 and then connected to phase A of the system power supply QF1, and then connected in parallel with the system start button SB1.

[0007] The input terminal of generator power supply QF2 is connected to the generator, and the output terminal is connected to the input terminal of generator contactor KM2. The output terminal of generator contactor KM2 is connected to the casting machine power supply. Phase C of generator power supply QF2 is connected to the normally closed contact of main power contactor KM1. The normally closed contact of main power contactor KM1 is connected to the normally open contact of generator power supply QF2. The output terminal of generator power supply QF2 is connected to the coil of generator contactor KM2 and then connected to phase B of generator power supply QF2. The generator starting line is connected to the normally open contact of generator power supply QF2 through the delayed normally closed contact of generator contactor KM2. The output terminal of generator power supply QF2 is connected to the normally closed contact of main power contactor KM1. The output terminal of main power contactor KM1 is connected to the generator start button SB3 and then connected in parallel to generator power supply QF2.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] The automatic power switching device for backup power supply of diesel engine in deep well casting provided by this utility model, when the system fails and loses power, the generator start signal is connected in series with the normally closed contact of the main power contactor KM1. When the system is powered off, the normally closed contact of the main power contactor KM1 is closed, and the generator starts working. Two seconds after the generator starts, the start signal is disconnected through the delayed disconnect contact of the generator contactor KM2, and the generator enters the generating state to supply power to the load. This realizes the automatic start of the diesel generator to supply power after the main power supply fails, shortens the time for the generator to start and supply power to the equipment after a power failure, reduces the probability of accidents, ensures stable equipment shutdown, and avoids safety accidents caused by system power failure. The structure is simple and the manufacturing cost is low. Attached Figure Description

[0010] Figure 1 This is a circuit connection diagram of the present invention;

[0011] In the diagram: QF1 - System power supply; QF2 - Generator power supply; KM1 - Main power contactor; KM2 - Generator contactor; SB1 - System start button; SB2 - Casting machine stop button; SB3 - Generator start button. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings:

[0013] like Figure 1 As shown, this utility model is an automatic power switching device for backup power supply of a deep well casting diesel engine, including system power supply QF1, generator power supply QF2, main power contactor KM1, generator contactor KM2, system start button SB1, casting machine stop button SB2 and generator start button SB3.

[0014] The input terminal of the system power switch QF1 is connected to the system power supply, and the output terminal is connected to the input terminal of the main power contactor KM1. The output terminal of the main power contactor KM1 is connected to the casting machine power supply. Phase B of the system power supply QF1 is connected to the normally closed contact of the generator contactor KM2. The normally closed contact of the generator contactor KM2 is connected to the casting machine stop button SB2. The casting machine stop button SB2 is connected to the normally open contact of the main power contactor KM1. The normally open contact of the main power contactor KM1 is connected to the coil of the main power contactor KM1 and then connected to phase A of the system power supply QF1, and then connected in parallel with the system start button SB1.

[0015] The input terminal of generator power supply QF2 is connected to the generator, and the output terminal is connected to the input terminal of generator contactor KM2. The output terminal of generator contactor KM2 is connected to the casting machine power supply. Phase C of generator power supply QF2 is connected to the normally closed contact of main power contactor KM1. The normally closed contact of main power contactor KM1 is connected to the normally open contact of generator power supply QF2. The output terminal of generator power supply QF2 is connected to the coil of generator contactor KM2 and then connected to phase B of generator power supply QF2. The generator starting line is connected to the normally open contact of generator power supply QF2 through the delayed normally closed contact of generator contactor KM2. The output terminal of generator power supply QF2 is connected to the normally closed contact of main power contactor KM1. The output terminal of main power contactor KM1 is connected to the generator start button SB3 and then connected in parallel to generator power supply QF2.

[0016] Under normal operating conditions, when the system power supply QF1 is closed and the system start button SB1 is pressed, the main power contactor KM1 is energized and engaged (the long closed contact of the series generator contactor KM2 is used for interlocking protection). The main power contactor KM1 closes to complete the power supply of the foundry machine.

[0017] After the casting machine is powered on and started, the generator power supply QF2 is switched on. The generator power supply QF2 contacts close, and the generator is in emergency standby mode.

[0018] The generator start signal is fed into the normally closed contact of the main power contactor KM1. When the system is powered off, the normally closed contact of the main power contactor KM1 is closed, and the generator starts working. Two seconds after the generator starts, the start signal is disconnected through the delayed disconnect contact of the generator contactor KM2.

[0019] In the control circuit, KM1① and KM2① are both interlocked, and the generator start button SB3 is used to check the generator status when starting the experiment.

Claims

1. An automatic power switching device for a backup power supply of a deep well casting diesel engine, characterized in that: It includes system power supply (QF1), generator power supply (QF2), main power contactor (KM1), generator contactor (KM2), system start button (SB1), casting machine stop button (SB2) and generator start button (SB3). The input terminal of the system power switch (QF1) is connected to the system power supply, and the output terminal is connected to the input terminal of the main power contactor (KM1). The output terminal of the main power contactor (KM1) is connected to the casting machine power supply. Phase B of the system power supply (QF1) is connected to the normally closed contact of the generator contactor (KM2). The normally closed contact of the generator contactor (KM2) is connected to the casting machine stop button (SB2). The casting machine stop button (SB2) is connected to the normally open contact of the main power contactor (KM1). The normally open contact of the main power contactor (KM1) is connected to the coil of the main power contactor (KM1) and then connected to phase A of the system power supply (QF1), and then connected in parallel with the system start button (SB1). The input terminal of the generator power supply (QF2) is connected to the generator, and the output terminal is connected to the input terminal of the generator contactor (KM2). The output terminal of the generator contactor (KM2) is connected to the casting machine power supply. Phase C of the generator power supply (QF2) is connected to the normally closed contact of the main power contactor (KM1), and the normally closed contact of the main power contactor (KM1) is connected to the normally open contact of the generator power supply (QF2). The output terminal of the generator power supply (QF2) is connected to the coil of the generator contactor (KM2) and then connected to the B phase of the generator power supply (QF2). The generator starting line is connected to the normally open contact of the generator power supply (QF2) through the delayed normally closed contact of the generator contactor (KM2). The output terminal of the generator power supply (QF2) is connected to the normally closed contact of the main power contactor (KM1), and the output terminal of the main power contactor (KM1) is connected to the generator start button (SB3) and then connected in parallel to the generator power supply (QF2).

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