A device for automatic delay stop and manual start-stop of downhole fan

Abstract

The utility model discloses a device for underground fan delay automatic stop and manual start -stop, including first circuit breaker, second circuit breaker, AC contactor, selection switch, first switch, second switch, third switch and time relay, and the first circuit breaker is connected with underground fan through the first normally open contact of AC contactor, and the first output of second circuit breaker is connected with selection switch through first switch, and selection switch is connected with the second output of second circuit breaker through second switch and the coil of AC contactor, and selection switch is connected between second switch and the coil of AC contactor through third switch and delay disconnect normally closed contact, and first switch is also connected between third switch and delay disconnect normally closed contact, and selection switch is connected with the second output of second circuit breaker through the third normally open contact of AC contactor and the coil of time relay. The utility model eliminates the problem of electric energy waste caused by long time invalid ventilation after underground blasting operation.

Description

Technical Field

[0001] This utility model belongs to the field of ventilation control technology, and in particular relates to a device for automatic delayed stop and manual start / stop of downhole ventilation fans. Background Technology

[0002] Currently, non-coal mining enterprises generally use blasting in the mining process. After blasting, in order to ensure operational safety, ventilation is required through fans to remove residual toxic and harmful gases (such as carbon monoxide and nitrogen oxides) from the working face, ensuring that sand extraction operations are carried out in a safe environment.

[0003] Traditional ventilation methods typically involve workers turning on the fans after loading explosives and running them continuously until the next shift arrives, at which point they are manually shut off. In practice, ventilation time often lasts for around 15 hours. However, according to on-site measurement data, only about 4 hours are needed to effectively remove toxic and harmful gases from the work area and meet safety requirements. The remaining 11 hours of ventilation are ineffective, not only failing to improve air quality at the work area but also resulting in significant energy waste. Furthermore, prolonged ineffective ventilation leads to the unreasonable occupation of fresh airflow underground, affecting the ventilation needs of other work areas and reducing overall ventilation efficiency.

[0004] The control of existing underground ventilation fans mainly relies on manual operation and lacks intelligent timer or automatic shutdown functions. Although some non-coal mining enterprises have tried to use simple timers to control ventilation time, due to the complex underground environment, the equipment must have explosion-proof, waterproof, and anti-interference characteristics, and ordinary timer devices are difficult to meet the safety and reliability requirements. Utility Model Content

[0005] The purpose of this invention is to provide a device for automatic delayed stop and manual start / stop of underground ventilation fans, in order to solve the problem of ineffective ventilation caused by the inability to accurately control ventilation time, which in turn leads to power waste.

[0006] This utility model solves the above-mentioned technical problems through the following technical solution: a device for automatic delayed stop and manual start / stop of a downhole fan, comprising a first circuit breaker, a second circuit breaker, an AC contactor, a selector switch, a first switch, a second switch, a third switch, and a time relay;

[0007] The input terminal of the first circuit breaker is connected to an external power source, and the output terminal of the first circuit breaker is connected to a downhole fan via the first normally open contact of an AC contactor. The input terminal of the second circuit breaker is connected to an external power source, and the first output terminal of the second circuit breaker is connected to the first terminal of the selector switch via a first switch. The second terminal of the selector switch is connected to the second output terminal of the second circuit breaker via a second switch and the coil of the AC contactor. The third terminal of the selector switch is connected between the second switch and the coil of the AC contactor via a third switch and the time-delayed normally closed contact of a time relay. The first switch is also connected between the third switch and the time-delayed normally closed contact of the time relay via the second normally open contact of the AC contactor. The third terminal of the selector switch is also connected to the second output terminal of the second circuit breaker via the third normally open contact of the AC contactor and the coil of the time relay.

[0008] Furthermore, the device also includes a thermal relay having a first normally closed contact and a second normally closed contact; the first normally closed contact of the thermal relay is located between the first normally open contact of the AC contactor and the fan, and the second normally closed contact of the thermal relay is located between the first output terminal of the second circuit breaker and the first switch.

[0009] Furthermore, the device also includes a first indicator light, and the thermal relay has a normally open contact. The first output terminal of the second circuit breaker is connected to the second output terminal of the second circuit breaker through the normally open contact of the thermal relay and the first indicator light.

[0010] Furthermore, the device also includes a second indicator light and a third indicator light, and the AC contactor also has a fourth normally open contact and a normally closed contact. The first output terminal of the second circuit breaker is connected to the second output terminal of the second circuit breaker through the fourth normally open contact of the AC contactor and the second indicator light. The first output terminal of the second circuit breaker is connected to the second output terminal of the second circuit breaker through the normally closed contact of the AC contactor and the third indicator light.

[0011] Furthermore, the device also includes a first fuse and a second fuse, wherein the first fuse is disposed at the first output terminal of the second circuit breaker and the second fuse is disposed at the second output terminal of the second circuit breaker.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] The device provided by this utility model can realize manual start-up and shutdown of the fan and automatic shutdown after a delay. These two fan start-up and shutdown methods are applicable to sand extraction and blasting operations in mines, respectively. It eliminates the problem of energy waste caused by long-term ineffective ventilation after underground blasting operations. It not only has excellent energy-saving effect, but also allows the fresh air flow underground to serve other locations with demand. At the same time, it reduces the operating time of the fan, extends the service life of the fan, and reduces the failure rate of the fan, which has excellent promotion benefits. Attached Figure Description

[0014] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the device used for automatic delayed stop and manual start / stop of the downhole fan in this embodiment of the utility model. Detailed Implementation

[0016] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0018] like Figure 1As shown in the embodiment of this utility model, the device for automatic delayed stop and manual start / stop of a downhole fan includes a first circuit breaker QF, a second circuit breaker Q1, an AC contactor, a selector switch SA, a first switch SB1, a second switch SB2, a third switch SB3, and a time relay. The input terminals L1 / L2 / L3 of the first circuit breaker QF are connected to an external power supply, and the output terminal of the first circuit breaker QF is connected to the downhole fan via the first normally open contact KM11 of the AC contactor. The input terminals L1 / L2 of the second circuit breaker Q1 are connected to an external power supply, and the first output terminal of the second circuit breaker Q1 is connected to the first terminal of the selector switch SA via the first switch SB1. The second terminal of the selector switch SA is connected to the second output terminal of the second circuit breaker Q1 via the second switch SB2 and the coil KM of the AC contactor. The third terminal of the selector switch SA is connected between the second switch SB2 and the coil KM of the AC contactor via the third switch SB3 and the time-delayed normally closed contact SJ11 of the time relay. The first switch SB1 is also connected between the third switch SB3 and the time-delayed normally closed contact SJ11 of the time relay via the second normally open contact KM12 of the AC contactor. The third terminal of the selector switch SA is also connected to the second output terminal of the second circuit breaker Q1 via the third normally open contact KM13 of the AC contactor and the coil SJ of the time relay.

[0019] When manually starting and stopping (sand removal operation), first close the first circuit breaker QF and the second circuit breaker Q1. Then operate the selector switch SA to connect the first and second terminals of the selector switch SA, which in turn closes the second switch SB2. This energizes the coil KM of the AC contactor, closing the first normally open contact KM11, the second normally open contact KM12, and the third normally open contact KM13 of the AC contactor, allowing the fan to start normally. The second switch SB2 can be used to manually control the start and stop of the fan, ensuring that the oxygen level in the work area meets the standards and that the temperature is lowered.

[0020] After loading the explosives, when the workers evacuate the work area (explosion operation), the first switch SB1 is opened, the coil KM of the AC contactor is de-energized, and the first normally open contact KM11, the second normally open contact KM12, and the third normally open contact KM13 of the AC contactor are opened, stopping the fan. The selector switch SA is then operated to connect its first and third terminals, and the first switch SB1 and the third switch SB3 are then closed. The coil KM of the AC contactor is energized, and the first normally open contact KM11, the second normally open contact, and the third normally open contact of the AC contactor are closed, starting the fan normally and energizing the coil SJ of the time relay. After the set time of the time relay is reached, the time-delayed normally closed contact SJ11 of the time relay automatically opens, de-energizing the coil KM of the AC contactor. The first normally open contact KM11, the second normally open contact KM12, and the third normally open contact KM13 of the AC contactor are opened, and the fan automatically stops.

[0021] For example, if the time relay is set to 4 hours, the normally closed contact SJ11 of the time relay will automatically disconnect after the fan has been running for 4 hours, and the fan will automatically stop, waiting for the sand discharge personnel to enter the work area to discharge sand.

[0022] In this embodiment, the time relay is model DH48S-2Z, the AC contactor is model NXC-1831, the first switch SB1, the second switch SB2 and the third switch SB3 are all push buttons and model LAY39-11, and the selector switch SA is model LAY39-11X.

[0023] In a specific embodiment of this utility model, the device further includes a thermal relay, which has a first normally closed contact FR1 and a second normally closed contact FR2. The first normally closed contact FR1 of the thermal relay is located between the first normally open contact KM11 of the AC contactor and the fan, and the second normally closed contact FR2 of the thermal relay is located between the first output terminal of the second circuit breaker Q1 and the first switch SB1.

[0024] Thermal relays can prevent damage to fans and other electrical components from overheating due to prolonged overcurrent.

[0025] In a specific embodiment of this utility model, the device further includes a first indicator light HR, and the thermal relay also has a normally open contact FR3. The first output terminal of the second circuit breaker Q1 is connected to the second output terminal of the second circuit breaker Q1 through the normally open contact FR3 of the thermal relay and the first indicator light HR.

[0026] By cooperating with the normally open contact FR3 of the thermal relay, overheat fault indication can be achieved.

[0027] In a specific embodiment of this utility model, the device further includes a second indicator light HG and a third indicator light HY. The AC contactor also has a fourth normally open contact KM14 and a normally closed contact KM15. The first output terminal of the second circuit breaker Q1 is connected to the second output terminal of the second circuit breaker Q1 through the fourth normally open contact KM14 of the AC contactor and the second indicator light HG. The first output terminal of the second circuit breaker Q1 is connected to the second output terminal of the second circuit breaker Q1 through the normally closed contact KM15 of the AC contactor and the third indicator light HY.

[0028] The second indicator light HG indicates the fan's operating status, and the third indicator light HY indicates the fan's stopped status.

[0029] In a specific embodiment of this utility model, the device further includes a first fuse FU1 and a second fuse FU2. The first fuse FU1 is disposed at the first output terminal of the second circuit breaker Q1, and the second fuse FU2 is disposed at the second output terminal of the second circuit breaker Q1.

[0030] Overcurrent protection is achieved through the first fuse FU1 and the second fuse FU2.

[0031] The above description only discloses specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or modifications that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for automatically stopping and manually starting / stopping a downhole ventilation fan after a delay, characterized in that, The device includes a first circuit breaker, a second circuit breaker, an AC contactor, a selector switch, a first switch, a second switch, a third switch, and a time relay; The input terminal of the first circuit breaker is connected to an external power source, and the output terminal of the first circuit breaker is connected to a downhole fan via the first normally open contact of an AC contactor. The input terminal of the second circuit breaker is connected to an external power source, and the first output terminal of the second circuit breaker is connected to the first terminal of the selector switch via a first switch. The second terminal of the selector switch is connected to the second output terminal of the second circuit breaker via a second switch and the coil of the AC contactor. The third terminal of the selector switch is connected between the second switch and the coil of the AC contactor via a third switch and the time-delayed normally closed contact of a time relay. The first switch is also connected between the third switch and the time-delayed normally closed contact of the time relay via the second normally open contact of the AC contactor. The third terminal of the selector switch is also connected to the second output terminal of the second circuit breaker via the third normally open contact of the AC contactor and the coil of the time relay.

2. The device for automatic delayed stop and manual start / stop of a downhole ventilation fan according to claim 1, characterized in that, The device also includes a thermal relay, which has a first normally closed contact and a second normally closed contact; the first normally closed contact of the thermal relay is located between the first normally open contact of the AC contactor and the fan, and the second normally closed contact of the thermal relay is located between the first output terminal of the second circuit breaker and the first switch.

3. The device for automatic delayed stop and manual start / stop of a downhole ventilation fan according to claim 2, characterized in that, The device also includes a first indicator light, and the thermal relay has a normally open contact. The first output terminal of the second circuit breaker is connected to the second output terminal of the second circuit breaker through the normally open contact of the thermal relay and the first indicator light.

4. The device for automatic delayed stop and manual start / stop of a downhole ventilation fan according to claim 1, characterized in that, The device also includes a second indicator light and a third indicator light. The AC contactor also has a fourth normally open contact and a normally closed contact. The first output terminal of the second circuit breaker is connected to the second output terminal of the second circuit breaker through the fourth normally open contact of the AC contactor and the second indicator light. The first output terminal of the second circuit breaker is connected to the second output terminal of the second circuit breaker through the normally closed contact of the AC contactor and the third indicator light.

5. The device for automatic delayed stop and manual start / stop of a downhole ventilation fan according to claim 1, characterized in that, The device further includes a first fuse and a second fuse, wherein the first fuse is located at the first output terminal of the second circuit breaker and the second fuse is located at the second output terminal of the second circuit breaker.

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