Dust removal fan control cabinet

Abstract

The utility model discloses a dust removal fan control cabinet which comprises a cabinet body and a cabinet door connected with the cabinet body, a circuit breaker QF is installed in the cabinet body, and a start button SB1 and a stop button SB2 are installed on the cabinet door. A relay KA1, a relay KA2, a relay KA3, a bypass contactor KM, a time relay KT1, a time relay KT2, a soft starter SS, a first temperature control switch and a second temperature control switch are further installed in the cabinet body. A main cooling fan is installed at the top of the cabinet body, and an auxiliary cooling fan is installed at the position, corresponding to the soft starter SS, of the side face of the cabinet body. According to the utility model, the soft starter is added, and when the fan is started, the soft starter enables the motor to accelerate smoothly by gradually increasing the power supply voltage, so that the starting current is reduced. And meanwhile, the fan is automatically controlled through the temperature control switch and the relay, so that the temperature in the cabinet is effectively reduced, and the problem of long-time operation of the fan under unnecessary conditions is solved.

Description

Technical Field

[0001] The utility model relates to a control cabinet. Background Art

[0002] The dust removal fan is an important device in the mine concentrator. The fan control cabinet of this device is generally installed in the crushing workshop. The current dust removal fan control cabinet has the following defects: 1. The starting current of the fan is large, which affects the normal operation of other devices in the workshop. 2. The cooling fan in the cabinet starts and stops automatically following the start and stop of the fan, and does not turn on at other times. However, the heat of the electrical control devices in the cabinet cannot be dissipated in time after the fan is turned off. Especially, other devices in the workshop will also emit a large amount of heat, and the accumulated heat in the control cabinet will affect the service life of the devices. If the manual control method is adopted, special personnel need to be on duty, otherwise the situation of forgetting to turn off will occur, resulting in the fan running for a long time under unnecessary circumstances and wasting electric energy resources. Content of the Utility Model

[0003] The utility model provides a dust removal fan control cabinet, and its purposes are: 1. To solve the problem of large starting current of the fan; 2. To solve the problem that the cooling fan cannot start and stop automatically according to the temperature in the cabinet.

[0004] The technical solution of the utility model is as follows:

[0005] A dust removal fan control cabinet includes a cabinet body and a cabinet door connected to the cabinet body. A circuit breaker QF is installed in the cabinet body, a start button SB1 and a stop button SB2 are installed on the cabinet door. A relay KA1, a relay KA2, a relay KA3, a bypass contactor KM, a time relay KT1, a time relay KT2, a soft starter SS, a first temperature control switch and a second temperature control switch are also installed in the cabinet body; a main cooling fan is installed at the top of the cabinet body, and an auxiliary cooling fan is installed at the position corresponding to the soft starter SS on the side of the cabinet body;

[0006] The circuit breaker QF and the soft starter SS are connected in series in the main circuit for supplying power to the dust removal fan, and the bypass contactor KM is connected in parallel with the soft starter SS;

[0007] A control circuit is provided between the positive pole and the negative pole of the power supply. In the control circuit:

[0008] The normally open contact of the start button SB1, the normally closed contact of the stop button SB2 and the coil part of the relay KA1 are connected in series between the positive pole and the negative pole of the power supply, and the first normally open contact of the relay KA1 is connected in parallel with the normally open contact of the start button SB1;

[0009] The bypass control contact of the soft starter SS and the coil part of the bypass contactor KM are connected in series between the positive pole and the negative pole of the power supply;

[0010] The first temperature control switch is multiple, which are connected in series and then in parallel with the first normally open contact of the relay KA2, and then in series with the normally closed contact of the time relay KT1 and the coil part of the time relay KT1 between the positive and negative poles of the power supply; the coil part of the relay KA2 is in parallel with the coil part of the time relay KT1;

[0011] The second temperature control switch is in parallel with the first normally open contact of the relay KA3, and then in series with the normally closed contact of the time relay KT2 and the coil part of the time relay KT2 between the positive and negative poles of the power supply; the coil part of the relay KA3 is in parallel with the coil part of the time relay KT2;

[0012] The second normally open contact of the relay KA2 is in parallel with the second normally open contact of the relay KA1, and then in series with multiple parallel main cooling fans between the positive and negative poles of the power supply;

[0013] The second normally open contact of the relay KA3 is in series with the auxiliary cooling fan between the positive and negative poles of the power supply;

[0014] The third normally open contact of the relay KA1 is connected to the start control port of the soft starter SS.

[0015] As a further improvement of the dust removal fan control cabinet: the cabinet body is divided into a first partition, a second partition, a third partition and a fourth partition, and the adjacent partitions are separated by a wire trough;

[0016] The circuit breaker QF is installed in the first partition, the relays KA1, KA2, KA3, the time relays KT1 and KT2 are installed in the second partition, the soft starter SS is installed in the third partition, and the bypass contactor KM is installed in the fourth partition.

[0017] As a further improvement of the dust removal fan control cabinet: the first temperature control switch includes a temperature control switch S1 installed in the first partition, a temperature control switch S2 installed in the second partition and a temperature control switch S3 installed in the fourth partition, and the second temperature control switch is the temperature control switch S4 installed in the third partition.

[0018] As a further improvement of the dust removal fan control cabinet: it further includes a voltmeter connected to the main circuit and a current transformer for detecting the current of the main circuit, and the current transformer is connected with an ammeter.

[0019] As a further improvement of the dust removal fan control cabinet: the ammeter and the voltmeter are installed on the cabinet door.

[0020] Compared with the prior art, the utility model has the following positive effects:

[0021] 1. In this utility model, a soft starter is added. When the fan is turned on, the soft starter gradually increases the supply voltage to smoothly accelerate the motor, thereby reducing the starting current.

[0022] 2. This utility model is also provided with a bypass contactor. When the motor reaches its rated speed, the bypass control contact of the soft starter automatically closes. At this time, the contact of the bypass contactor KM closes to short - circuit the soft starter, so that the current does not pass through the soft starter, avoiding the overheating of the soft starter during long - term operation.

[0023] 3. This utility model also detects the temperature inside the cabinet through a temperature control switch. When the temperature inside the cabinet is relatively high, the cooling fan is automatically started and delayed to turn off, which not only improves the heat dissipation effect but also avoids wasting electric energy by keeping the fan on for a long time.

[0024] 4. This utility model also specially equips an auxiliary cooling fan for the soft starter, which is controlled separately according to the temperature around the soft starter to deal with the problem that the soft starter is prone to overheat when the fan starts and stops frequently. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the layout inside the control cabinet;

[0026] Figure 2 It is a schematic diagram of the layout of the control cabinet door;

[0027] Figure 3 It is the electrical schematic diagram of the main circuit;

[0028] Figure 4 It is the electrical schematic diagram of the control circuit. Detailed Implementation Manner

[0029] The technical solution of this utility model will be described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all of the embodiments.

[0030] A dust removal fan control cabinet includes a cabinet body and a cabinet door connected to the cabinet body.

[0031] As Figure 1 , a circuit breaker QF, a relay KA1, a relay KA2, a relay KA3, a bypass contactor KM, a time relay KT1, a time relay KT2, a soft starter SS, a first temperature control switch, and a second temperature control switch are installed in the cabinet body.

[0032] The interior of the cabinet is divided into a first partition 3, a second partition 8, a third partition 6, and a fourth partition 7. The adjacent partitions are separated by wire troughs. The circuit breaker QF is installed in the first partition 3, the relays KA1, KA2, KA3, the time relay KT1, and the time relay KT2 are installed in the second partition 8, the soft starter SS is installed in the third partition 6, and the bypass contactor KM is installed in the fourth partition 7.

[0033] Further, the first temperature control switch includes a temperature control switch S1 installed in the first partition 3, a temperature control switch S2 installed in the second partition 8, and a temperature control switch S3 installed in the fourth partition 7, and the triggering temperature of the three is 40 degrees. The second temperature control switch is a temperature control switch S4 installed in the third partition 6, and the triggering temperature is 45 degrees.

[0034] Further, a main cooling fan is installed on the top of the cabinet, including a first fan 1 and a second fan 2 arranged left and right. An auxiliary cooling fan, i.e., the third fan 5 in the figure, is installed at the position corresponding to the soft starter SS on the side of the cabinet.

[0035] As Figure 2 , the cabinet door adopts a stainless steel double-layer door design, which is more corrosion-resistant and more suitable for the harsh environment of dust and moisture in mines. A start button SB1, a stop button SB2, an ammeter 9, a voltmeter 10, and an operation indicator light are installed on the cabinet door.

[0036] Further, as Figure 3 , the circuit breaker QF and the soft starter SS are connected in series in the main circuit for supplying power to the dust removal fan, and the bypass contactor KM is connected in parallel with the soft starter SS. The third normally open contact of the relay KA1 is connected to the start control port of the soft starter SS.

[0037] Further, the voltmeter 10 is connected to the main circuit to detect and display the voltage. A current transformer 4 for detecting current is also provided on the main circuit. The ammeter 9 is electrically connected to the current transformer 4 for real-time display of current.

[0038] A control circuit as shown in Figure 4 is provided between the positive and negative poles of the power supply. In the control circuit:

[0039] The normally open contact of the start button SB1, the normally closed contact of the stop button SB2, and the coil part of the relay KA1 are connected in series between the positive and negative poles of the power supply, and the first normally open contact of the relay KA1 is connected in parallel with the normally open contact of the start button SB1.

[0040] The bypass control contact of the soft starter SS and the coil part of the bypass contactor KM are connected in series between the positive and negative poles of the power supply.

[0041] The temperature control switches S1, S2, and S3 are connected in series and then in parallel with the first normally open contact of the relay KA2. Then, they are connected in series with the normally closed contact of the time relay KT1 and the coil part of the time relay KT1 between the positive and negative poles of the power supply. The coil part of the relay KA2 is connected in parallel with the coil part of the time relay KT1.

[0042] The temperature control switch S4 is connected in parallel with the first normally open contact of the relay KA3. Then, it is connected in series with the normally closed contact of the time relay KT2 and the coil part of the time relay KT2 between the positive and negative poles of the power supply. The coil part of the relay KA3 is connected in parallel with the coil part of the time relay KT2.

[0043] The second normally open contact of the relay KA2 is connected in parallel with the second normally open contact of the relay KA1, and then connected in series with multiple parallel main cooling fans between the positive and negative poles of the power supply.

[0044] The second normally open contact of the relay KA3 is connected in series with the auxiliary cooling fan between the positive and negative poles of the power supply.

[0045] After pressing the start button SB1, the relay KA1 is energized and self-locked through the first normally open contact. The third normally open contact of the relay KA1 closes, and the soft starter SS starts. During the start-up process, the voltage gradually increases to avoid excessive starting current. After the fan starts, the bypass control contact of the soft starter SS closes, causing the bypass contactor KM to be energized and closed, and the current no longer flows through the soft starter SS. After pressing the stop button SB2, the relay KA1 loses power. The soft starter SS shuts down and disconnects the bypass control contact at the same time, causing the bypass contactor KM to lose power and disconnect, and the fan stops working.

[0046] When the relay KA1 is energized, that is, when the fan is starting, the first fan 1 and the second fan 2 always work for heat dissipation.

[0047] When the fan is not working, if the temperatures of the temperature control switches S1, S2, and S3 all exceed the preset value (the heat has not dissipated or due to other external reasons), the relay KA2 is energized, and the first fan 1 and the second fan 2 start to work. After the time relay KT1 finishes timing, the first fan 1 and the second fan 2 stop working (if the fan has not started).

[0048] If the temperature of the temperature control switch S4 exceeds the preset value (the soft starter SS is overheated), the relay KA3 is energized, and the third fan 5 starts to work to cool down the soft starter SS. After the time relay KT2 finishes timing, the third fan 5 stops working.

[0049] It should be noted that for those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. The scope of the present utility model is defined by the claims rather than the above description.

Claims

1. A dust removal fan control cabinet, comprising a cabinet body and a cabinet door connected to the cabinet body, wherein a circuit breaker QF is installed in the cabinet body, and a start button SB1 and a stop button SB2 are installed on the cabinet door, characterized in that: The cabinet is also equipped with relay KA1, relay KA2, relay KA3, bypass contactor KM, time relay KT1, time relay KT2, soft starter SS, first temperature control switch and second temperature control switch; the main cooling fan is installed on the top of the cabinet, and the auxiliary cooling fan is installed on the side of the cabinet corresponding to the position of the soft starter SS; The circuit breaker QF and the soft starter SS are connected in series in the main circuit for powering the dust removal fan, and the bypass contactor KM is connected in parallel with the soft starter SS; A control circuit is provided between the positive and negative poles of the power supply, in which: The normally open contact of the start button SB1, the normally closed contact of the stop button SB2 and the coil part of the relay KA1 are connected in series between the positive and negative poles of the power supply, and the first normally open contact of the relay KA1 is connected in parallel with the normally open contact of the start button SB1; The bypass control contact of the soft starter SS and the coil part of the bypass contactor KM are connected in series between the positive and negative poles of the power supply; The first temperature control switch is multiple, connected in series with the first normally open contact of the relay KA2 in parallel, and then connected in series with the normally closed contact of the time relay KT1 and the coil part of the time relay KT1 between the positive and negative poles of the power supply; the coil part of the relay KA2 is connected in parallel with the coil part of the time relay KT1; The second temperature control switch is connected in parallel with the first normally open contact of the relay KA3, and then connected in series with the normally closed contact of the time relay KT2 and the coil part of the time relay KT2 between the positive and negative poles of the power supply; the coil part of the relay KA3 is connected in parallel with the coil part of the time relay KT2; The second normally open contact of the relay KA2 is connected in parallel with the second normally open contact of the relay KA1, and then connected in series with a plurality of parallel main cooling fans between the positive and negative electrodes of the power supply; The second normally open contact of the relay KA3 is connected in series with the auxiliary cooling fan between the positive and negative electrodes of the power supply; The third normally open contact of relay KA1 is connected to the start control port of soft starter SS.

2. The dust removal fan control cabinet according to claim 1, characterized in that: The cabinet is divided into a first partition (3), a second partition (8), a third partition (6) and a fourth partition (7), and adjacent partitions are separated by wiring troughs; The circuit breaker QF is installed in the first partition (3), the relay KA1, the relay KA2, the relay KA3, the time relay KT1 and the time relay KT2 are installed in the second partition (8), the soft starter SS is installed in the third partition (6), and the bypass contactor KM is installed in the fourth partition (7).

3. The dust removal fan control cabinet according to claim 2, characterized in that: The first temperature-controlled switch comprises a temperature-controlled switch S1 installed in the first partition (3), a temperature-controlled switch S2 installed in the second partition (8) and a temperature-controlled switch S3 installed in the fourth partition (7), and the second temperature-controlled switch is a temperature-controlled switch S4 installed in the third partition (6).

4. The dust removal fan control cabinet according to any one of claims 1 to 3, characterized in that: It also includes a voltmeter (10) connected to the main circuit and a current transformer (4) for detecting the current of the main circuit, wherein the current transformer (4) is connected to the ammeter (9).

5. The dust removal fan control cabinet according to claim 4, characterized in that: The ammeter (9) and the voltmeter (10) are mounted on the cabinet door.

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