Motor self-starting device after electric power flash stop

Abstract

The utility model discloses a motor self-starting device after electric power flash stop, and relates to the technical field of glass substrate production equipment, an electric pump M is connected with three-phase power lines L1, L2 and L3, the power lines L1, L2 and L3 are sequentially connected with a thermal relay FR, an alternating current contactor KM1 and a first circuit breaker QF1, one end of a second circuit breaker QF2 is connected with the circuit breaker QF1 on the power line L2, and the other end of the second circuit breaker QF2 is connected with the alternating current contactor KM1. The other end of the second circuit breaker QF2 is connected with a normally closed stop button SA, one end of a normally open start button SB is connected with the normally closed stop button SA, one end of a normally open start button SB is connected with an alternating current contactor KM, one end of a thermal relay I FR1 is connected with the alternating current contactor KM, and the other end of the thermal relay I FR1 is connected with a circuit breaker QF1 on a power line L3 through a third circuit breaker QF3; according to the utility model, the motor is automatically electrified to recover operation, thereby ensuring the normal operation of the circulating pump and the cooling pump.

Description

Technical Field

[0001] The utility model relates to the technical field of glass substrate production equipment, in particular to a motor self-starting device after power failure. Background Art

[0002] The circulation pump and cooling pump are used in the flue gas treatment step to cool the exhaust gas at the spraying point. After the hot gas is cooled, it is convenient for subsequent treatment and utilization;

[0003] During the glass substrate production process, the exhaust gas treatment step requires cooling the hot gases to facilitate subsequent mixing with urea liquid to treat nitrogen oxides and other waste gases. In actual production, due to cost constraints, the circulation pumps and cooling pumps are not powered by a UPS. Consequently, in the event of a power outage, the circulation pumps and cooling pumps cannot be restarted in a timely manner, resulting in substandard exhaust gas emissions. Therefore, adding this self-starting device to both pumps can prevent this from happening. Utility Model Content

[0004] The purpose of the utility model is to provide a motor self-starting device after power outage, so as to solve the technical problem that a circulation pump and a cooling pump cannot be started in time after power outage.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A motor self-starting device after a power outage, comprising an electric pump M, a second circuit breaker QF2, a normally closed stop button SA, a normally open start button SB, an AC contactor KM, a power-off delay time relay KT, a thermal relay FR, and a contactor normally open contact NO. The electric pump M is connected to three-phase power lines L1, L2, and L3, respectively. The power lines L1, L2, and L3 are sequentially connected to the thermal relay FR, the AC contactor KM1, and the first circuit breaker QF1. The FR is located on the side close to the electric pump M. One end of the second circuit breaker QF2 is connected to the Interface 1 is connected to the circuit breaker QF1 on the power line L2, interface 2 at one end of the second circuit breaker QF2 is connected to the circuit breaker QF1 on the power line L3, interface 1 at the other end of the second circuit breaker QF2 is connected to the normally closed stop button SA, one end of the normally open start button SB is connected to the normally closed stop button SA, one end of the normally open start button SB is connected to the AC contactor KM, one end of the thermal relay FR1 is connected to the AC contactor KM, and the other end of the thermal relay FR1 is connected to the circuit breaker QF1 on the power line L3 through the second circuit breaker QF2;

[0007] The normally open start button SB is connected in parallel with a non-delayed normally open contact KT1;

[0008] One end of the power-off delay time relay KT is connected to the normally closed stop button SA through the normally open contact NO of the contactor, and the other end of the power-off delay time relay KT is connected to the circuit breaker QF1 on the power line L3 through the second circuit breaker QF2;

[0009] The contactor normally open contact NO is connected in parallel with a power-off delay normally open contact KT2.

[0010] As a further solution of the present invention: the electric pump M is a cooling pump or a circulation pump.

[0011] As a further solution of the present invention: the power-off delay time relay KT is set to a delay of Ts. When the power is restored within Ts, the circuit remains energized to maintain the operation of the motor.

[0012] As a further solution of the present invention: when the circuit needs to be disconnected, the button switch SA needs to be pressed for a time longer than Ts, otherwise an automatic restart will occur.

[0013] The beneficial effects of the present invention are as follows: when a power outage occurs during the normal operation of the circulation pump and the cooling pump, the AC contactor KM and the power-off delay time relay KT are de-energized at the moment the power outage occurs, and the power-off delay normally open contact KT2 starts timing. Because the power outage process is short, shorter than the set value of the power-off delay time relay KT, the power-off delay normally open contact KT2 is not disconnected. After power is restored, the AC contactor KM and the power-off delay time relay KT are re-energized and attracted, so that the motor is automatically energized and resumes operation, thereby ensuring the normal operation of the circulation pump and the cooling pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 It is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0016] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] See also Figure 1As shown, the utility model is a motor self-starting device after power failure, including an electric pump M, a second circuit breaker QF2, a normally closed stop button SA, a normally open start button SB, an AC contactor KM, a power-off delay time relay KT, a thermal relay FR and a contactor normally open contact NO. The electric pump M is connected to three-phase power lines L1, L2 and L3 respectively. The power lines L1, L2 and L3 are connected in sequence with a thermal relay FR, an AC contactor KM1 and a first circuit breaker QF1. The FR is located on the side close to the electric pump M. The second circuit breaker QF2 One end interface 1 is connected to the circuit breaker QF1 on the power line L2, one end interface 2 of the second circuit breaker QF2 is connected to the circuit breaker QF1 on the power line L3, the other end interface 1 of the second circuit breaker QF2 is connected to the normally closed stop button SA, one end of the normally open start button SB is connected to the normally closed stop button SA, one end of the normally open start button SB is connected to the AC contactor KM, one end of the thermal relay FR1 is connected to the AC contactor KM, and the other end of the thermal relay FR1 is connected to the circuit breaker QF1 on the power line L3 through the second circuit breaker QF2;

[0018] The normally open start button SB is connected in parallel with a non-delayed normally open contact KT1;

[0019] One end of the power-off delay time relay KT is connected to the normally closed stop button SA through the normally open contact NO of the contactor, and the other end of the power-off delay time relay KT is connected to the circuit breaker QF1 on the power line L3 through the second circuit breaker QF2;

[0020] The contactor normally open contact NO is connected in parallel with a power-off delay normally open contact KT2.

[0021] The electric pump M is a cooling pump or a circulation pump.

[0022] The power-off delay time relay KT is set to delay Ts. When the power is restored within Ts, the circuit remains energized to maintain the motor operation.

[0023] When the circuit needs to be disconnected, the button switch SA needs to be pressed for more than Ts, otherwise it will automatically restart.

[0024] The working principle of the utility model is: under normal circumstances, press the normally open start button SB, the AC contactor KM and the power-off delay time relay KT are energized and attracted, the non-delayed normally open contact KT1 is closed, and the motor runs normally.

[0025] When a short shutdown occurs, the AC contactor KM and the power-off delay time relay KT are de-energized at the moment the power outage occurs, and the power-off delay normally open contact KT2 starts timing. Because the power outage time is short, the power outage time is shorter than the set value of the power-off delay time relay KT. At this time, the power-off delay normally open contact KT2 is not disconnected. After power is restored, the AC contactor KM and the power-off delay time relay KT will be re-energized and attracted, so that the motor will be energized and resume operation by itself.

[0026] When the motor needs to be stopped, the time when the normally closed stop button SA is pressed should be greater than the set time of the power-off delay time relay KT.

[0027] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A motor self-starting device after power failure, characterized in that: It includes an electric pump M, a second circuit breaker QF2, a normally closed stop button SA, a normally open start button SB, an AC contactor KM, a power-off delay time relay KT, a thermal relay FR and a contactor normally open contact NO. The electric pump M is connected to three-phase power lines L1, L2 and L3 respectively. The power lines L1, L2 and L3 are connected in sequence with the thermal relay FR, the AC contactor KM1 and the first circuit breaker QF1. The FR is located on the side close to the electric pump M. One end interface of the second circuit breaker QF2 is connected to the power line L2. The circuit breaker QF1 on the power line L3 is connected to the second circuit breaker QF2, the second end interface 2 is connected to the circuit breaker QF1 on the power line L3, the other end interface 1 of the second circuit breaker QF2 is connected to the normally closed stop button SA, one end of the normally open start button SB is connected to the normally closed stop button SA, one end of the normally open start button SB is connected to the AC contactor KM, one end of the thermal relay FR1 is connected to the AC contactor KM, and the other end of the thermal relay FR1 is connected to the circuit breaker QF1 on the power line L3 through the second circuit breaker QF2; The normally open start button SB is connected in parallel with a non-delayed normally open contact KT1; One end of the power-off delay time relay KT is connected to the normally closed stop button SA through the normally open contact NO of the contactor, and the other end of the power-off delay time relay KT is connected to the circuit breaker QF1 on the power line L3 through the second circuit breaker QF2; The contactor normally open contact NO is connected in parallel with a power-off delay normally open contact KT2.

2. The motor self-starting device after power failure according to claim 1, characterized in that: The electric pump M is a cooling pump or a circulation pump.

3. The motor self-starting device after power failure according to claim 1, characterized in that: The power-off delay time relay KT is set to delay Ts. When the power is restored within Ts, the circuit remains energized to maintain the motor operation.

4. The motor self-starting device after power failure according to claim 3, characterized in that: When the circuit needs to be disconnected, the button switch SA needs to be pressed for more than Ts, otherwise it will automatically restart.

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