CN210430897U - Anti-interference electricity duplex fan switch - Google Patents

Abstract

A power-interference-prevention duplex fan switch comprises a main loop, a control loop and a protection loop, wherein a secondary winding of a transformer of the control loop is connected in series with a power-off delay relay through a starting intermediate relay contact K1-2, and a delay disconnection contact SJ2-1 of the power-off delay relay is connected in series with a normally-closed point QA1-2 of a starting button and then connected in parallel with the starting loop. The utility model relates to a simply ingenious, can effectively avoid high pressure to shake the electricity and arouse the problem that can't start by oneself after electromagnetic starter decompression separating brake to the continuous reliability of power supply has been ensured. If the voltage of the power grid disappears momentarily, the switch can be quickly restored, so that the local ventilator on the excavation working face keeps continuous operation. When the voltage of the power grid is interrupted for a long time due to non-interference electricity, the starter cannot be automatically restarted after the upper-level power supply recovers to supply power normally, so that the safe production of a working face is ensured.

Description

Anti-interference electricity duplex fan switch

Technical Field

The utility model relates to a dual supply double fan flame-proof type fan special switch.

Background

The mine local ventilator is a key device for coal mine production, and mainly has the main functions of feeding fresh air flow to a driving face, desalting the concentration of harmful gas and ensuring the most effective measure for operation safety, and the operation reliability of the mine local ventilator is important for coal roadways and the like in high gas mines, coal and gas outburst mines and high gas areas in low gas mines. In order to improve the operation reliability of the local ventilator, the requirements of equipment management, power supply modes and the like are particularly strict.

The one hundred twenty-eight item of the coal mine safety regulation specifies that local ventilators must be managed by institutional personnel; the local ventilator which normally works must be assembled and installed with spare local ventilators with the same capacity, and can be automatically switched; the local ventilator which normally works must adopt 'three special' (special switch, special cable and special transformer) to supply power; the power supplies of the local ventilator and the standby fan which work normally must be provided with mutually independent power supplies of different bus sections at the same time, and other safe and reliable measures. Therefore, the safety of underground ventilation is improved, and accidents caused by gas overrun due to air supply interruption caused by power failure of power supply lines and equipment or other reasons are avoided.

In the actual production process, the influence of severe weather such as thunderstorm, strong wind and the like is received, and when the power supply system is subjected to power interference, the ground high-voltage power supply line switch has an automatic reclosing function, namely, the power interference is realized. After the electricity is shaken, the high-voltage line can keep the continuity of power supply through the automatic reclosing lock. However, because the local ventilator used in the underground coal mine is controlled by the explosion-proof dual-power vacuum electromagnetic starter, the electromagnetic starter is designed to release without pressure, when the power supply of the fan is interrupted in the moment of high-voltage power shaking, the electromagnetic starter trips and self-locks when power is lost, the fan carried by the electromagnetic starter stops running, even if the power supply of a superior power supply is recovered in the moment (power shaking), the dual-power of the electromagnetic starter has no self-starting function due to the power shaking interruption, and the fan needs to be started by manual operation. From the electricity dazzling, to artifical manual recovery power transmission to fan normal operating, often need very long period of time, like this, to high gas or gas outburst mine, probably cause the gas transfinite and then cause the gas accident, bring serious potential safety hazard for the mine production.

Disclosure of Invention

The utility model aims at designing an anti-interference electricity double fan switch, this kind of technical scheme is after the electricity of shaking takes place, and electromagnetic starter can resume the combined floodgate fast, solves the high voltage electric network problem that causes the auxiliary ventilating fan can not the automatic recovery operation in the twinkling of an eye the outage, effectively prevents because of the potential safety hazard that the electricity of shaking shut down and bring.

Realize the utility model discloses the technical scheme that the purpose was taken is: the secondary winding of the transformer of the control loop is connected with a power-off delay relay in series through a starting intermediate relay contact K1-2, and a delay disconnection contact SJ2-1 of the power-off delay relay is connected with a starting button normally-closed point QA1-2 in series and then connected with the starting loop in parallel.

The utility model has the advantages that: the design is simple and ingenious, the problem that the electromagnetic starter cannot be automatically started after being subjected to voltage loss and brake opening due to high-voltage electricity interference can be effectively avoided, and the continuous reliability of power supply is ensured; if the voltage of the power grid disappears momentarily, the switch-on can be quickly recovered, so that the local ventilator on the excavation working face keeps continuous operation; when the voltage of the power grid is interrupted for a long time due to non-interference electricity, the starter cannot be automatically restarted after the upper-level power supply recovers to supply power normally, so that the safe production of a working face is ensured.

Drawings

Fig. 1 is an electrical schematic diagram of the control part of the present invention.

Detailed Description

Fig. 1 is an electrical schematic diagram of a control part of a dual-power double-fan explosion-proof type fan special switch, the overall working principle of the switch is not described, and only the working principle of a control loop improvement part is described. A secondary output end of a control loop transformer is connected in series with a power-off delay relay SJ2 through a starting intermediate relay contact K1-2, and a power-off delay contact SJ2-1 of the control loop transformer is connected in series with a starting button QA1-2 and then connected in parallel with two ends of a switching-on signal PIR.

The working principle is as follows:

the relay power-off delay function is mainly utilized, the purpose of restarting after power interference is achieved, the purpose of rapidly closing the switch in the twinkling of an eye by power interference is achieved, air supply of a working face is recovered, and safety production is guaranteed.

When the protector normally works, a starting button QA-1 is pressed, 1 pin and 2 pin pilot output closing signals of the protector PIR, a 36V power supply passes through the 1 pin and 2 pin of the PIR and a normally closed contact KM2 through TA, a coil of a relay K1 (51 pin and 52 pin of the protector PIR are closed without faults) forms a closed loop to the other end of the power supply, a relay K1 is powered on and closed to attract (a normally open contact K1-1 of the relay is closed to be powered on and a delay relay SJ1 power supply, SJ1 acts, a main contactor KM1 power supply fan is switched on to operate), the other contact K1-2 of the relay is closed and a delay relay SJ2 power supply, at the moment, a power-off delay relay SJ2 is powered on and attracts, and a delay-off contact SJ2-1 of the relay is instantly.

Self-starting principle after electricity interference. It is based on the above-mentioned process to let the electromagnetic starter start again. Before power interference, as a delay disconnection contact SJ2-1 is closed instantly to bypass a switching-on signal PIR contact 1 and 2 feet, the switching-on circuit is already switched on, after an upper-level power supply disappears instantly, a power-off delay relay SJ2 is also powered off, but the contact SJ2-1 is used for delaying the switching-off of the switching-on circuit, when the contact is not switched off (the time of delaying the switching-off is set to be larger than the power interference time and the upper-level automatic reclosing time), the power supply of a power grid is restored again, a starter is automatically switched on to start a fan which is just stopped, the power interference prevention function is realized, and normal ventilation is recovered.

Non-power-dazzling does not carry out the principle of self-starting. If the local ventilator on the excavation working face is stopped for a long time due to non-electricity interference, and when the power supply is recovered, in order to ensure the safe starting and operation of the local ventilator, the electromagnetic starter of the local ventilator is not allowed to be started automatically at the moment according to the regulation of coal mine safety regulations, and the local ventilator can be manually started only when the gas content is checked to be within the allowable range. Based on the above-mentioned operational requirement, the utility model discloses the realization principle is: after the power supply loses power for a long time, the bypass is disconnected in a delayed mode (about 2 seconds) at a contact SJ2-1 of PIR contact 1 and a contact 2 of foot starting signals, and after a starting loop is disconnected, the fan does not have the function of self-starting again.

The utility model discloses a it is as double fan dual supply fan special switch, and vice fan is applied to equally to this design, is exactly at this device of starter installation of vice fan, realizes the function equal with main fan, no longer explains here.

Claims (1)

1. The utility model provides an anti-interference electricity duplex fan switch, comprises three major part in major loop, control circuit and protection circuit, its characterized in that: a power-off delay relay is connected in series to a secondary winding of a control loop transformer through a starting intermediate relay contact K1-2, and a delay disconnection contact SJ2-1 of the power-off delay relay is connected in series with a starting button normally-closed point QA1-2 and then connected in parallel to a starting loop.

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