CN213367680U - Coal preparation plant inverter motor temperature monitoring device - Google Patents
Coal preparation plant inverter motor temperature monitoring device Download PDFInfo
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- CN213367680U CN213367680U CN202022533882.1U CN202022533882U CN213367680U CN 213367680 U CN213367680 U CN 213367680U CN 202022533882 U CN202022533882 U CN 202022533882U CN 213367680 U CN213367680 U CN 213367680U
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- control switch
- temperature control
- temperature
- relay
- variable frequency
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Abstract
The invention discloses a temperature monitoring device for a variable frequency motor of a coal preparation plant, wherein a first temperature control circuit comprises a first temperature control switch, and the first temperature control switch is connected with an alternating current power supply after being connected with a first relay and an alarm lamp in series; the first temperature control switch is also connected with a first power supply in series; the first temperature control switch is connected with a first temperature sensor; the second temperature control circuit comprises a second temperature control switch, and the second temperature control switch is connected with the variable frequency motor control switch after being connected with a second relay in series; the second temperature control switch is also connected with a second power supply in series; the second temperature control switch is connected with a second temperature sensor; the first temperature sensor and the second temperature sensor are both arranged at the part to be measured of the variable frequency motor; according to the invention, the temperature sensor is arranged at the part to be measured of the variable frequency motor, when the temperature is detected to reach the threshold value, the temperature control switch is triggered to be closed, and then the alarm lamp is triggered to emit warning light or the variable frequency motor control switch is triggered to turn off the power supply of the variable frequency motor, so that the variable frequency motor is protected from being cooled.
Description
Technical Field
The invention belongs to a variable frequency motor monitoring device, and particularly relates to a variable frequency motor temperature monitoring device for a coal preparation plant.
Background
In the coal preparation plant production process, generally there is a large amount of inverter motor, and ordinary inverter motor cooling fan is driven by the motor spindle, unable independent operation, and the cooling air volume of motor depends on the height of motor speed, can't effectually dispel the heat for the motor when the motor low-speed operation, causes the long-time overheat operation of motor easily, and then ages in advance and influence life, has increased the fault rate of motor.
Therefore, if the normal operation of the variable frequency motor is required to be ensured, the motor needs to be replaced or an on-duty electrician needs to patrol the motor in time. The replacement of a new motor requires a large amount of capital, which puts increased cost pressure on the coal preparation plant. Because the number of the motors is large, an on-duty electrician is difficult to patrol and repair a plurality of motors at the same time.
Disclosure of Invention
The invention aims to provide a temperature monitoring device for variable frequency motors of a coal preparation plant, which can be used for monitoring the temperatures of important parts of a plurality of motors in real time simultaneously and avoiding the problem of motor burnout caused by high temperature.
The invention adopts the following technical scheme: a temperature monitoring device for a variable frequency motor of a coal preparation plant comprises a first temperature control circuit and a second temperature control circuit;
the first temperature control circuit comprises a first temperature control switch, and the first temperature control switch is connected with the alternating current power supply after being connected with the first relay and the alarm lamp in series; the first temperature control switch is also connected in series with a first power supply, and the first temperature control switch, the first relay and the first power supply form a first control loop;
the first temperature control switch is connected with a first temperature sensor;
the second temperature control circuit comprises a second temperature control switch, and the second temperature control switch is connected with the variable frequency motor control switch after being connected with a second relay in series; the second temperature control switch is also connected with a second power supply in series, and the second temperature control switch, the second relay and the second power supply form a second control loop;
the second temperature control switch is connected with a second temperature sensor;
the first temperature sensor and the second temperature sensor are both arranged at the part to be measured of the variable frequency motor;
the first temperature control switch is closed when the measured temperature of the first temperature sensor reaches a first threshold value, and then a circuit is switched on through a first relay to enable the alarm lamp to emit warning light;
and the second temperature control switch is closed when the measured temperature of the second temperature sensor reaches a second threshold value, and then the second relay is used for switching on the circuit to enable the variable frequency motor control switch to switch off the power supply of the variable frequency motor.
Further, the first relay includes a first relay switch and a first relay coil.
Further, the second relay includes a second relay switch and a second relay coil.
Further, the second threshold is greater than the first threshold.
Furthermore, the first temperature control switch is also connected with a loudspeaker in series.
Further, the first power supply and the second power supply are the same direct current power supply.
The invention has the beneficial effects that: according to the invention, the temperature sensor is arranged at the part to be measured of the variable frequency motor, when the temperature is detected to reach the threshold value, the temperature control switch is triggered to be closed, so that a control loop is formed with the relay and the direct current power supply, and the alarm lamp is triggered to emit warning light or the variable frequency motor control switch is triggered to close the power supply of the variable frequency motor, so that the variable frequency motor is protected from being cooled.
Drawings
Fig. 1 is a schematic circuit diagram of a temperature monitoring device of a variable frequency motor of a coal preparation plant.
Wherein: 1. an alarm lamp; 2. an alternating current power supply; 3. a first temperature control switch; 4. a first relay; 5. a direct current power supply; 6, a second temperature control switch; 7. a second relay; 8. a variable frequency motor control switch;
41. a first relay switch; 42. a first relay coil;
71. a second relay switch; 72. a second relay coil.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention discloses a temperature monitoring device for a variable frequency motor of a coal preparation plant, which comprises a first temperature control circuit and a second temperature control circuit, wherein the first temperature control circuit is connected with the first temperature control circuit; the first temperature control circuit comprises a first temperature control switch 3, and the first temperature control switch 3 is connected with an alternating current power supply 2 after being connected with a first relay 4 and an alarm lamp 1 in series; the first temperature control switch 3 is also connected in series with a first power supply, and the first temperature control switch 3, the first relay 4 and the first power supply form a first control loop; the first temperature control switch 3 is connected with a first temperature sensor; the second temperature control circuit comprises a second temperature control switch 6, and the second temperature control switch 6 is connected with a second relay 7 in series and then is connected with a variable frequency motor control switch 8; the second temperature control switch 6 is also connected in series with a second power supply, and the second temperature control switch 6, the second relay 7 and the second power supply form a second control loop; the second temperature control switch 6 is connected with a second temperature sensor; the first temperature sensor and the second temperature sensor are both arranged at the part to be measured of the variable frequency motor.
The first temperature control switch 3 is used for being closed when the measured temperature of the first temperature sensor reaches a first threshold value, and then a circuit is switched on through the first relay 4 to enable the alarm lamp 1 to emit alarm light; and the second temperature control switch 6 is used for being closed when the measured temperature of the second temperature sensor reaches a second threshold value, and further the circuit is switched on through the second relay 7 to enable the variable frequency motor control switch 8 to cut off the power supply of the variable frequency motor.
According to the invention, the temperature sensor is arranged at the part to be measured of the variable frequency motor, when the temperature is detected to reach the threshold value, the temperature control switch is turned off, so that a control loop is formed with the relay and the direct current power supply, and the alarm lamp is triggered to emit warning light or the variable frequency motor control switch is triggered to turn off the power supply of the variable frequency motor, so that the variable frequency motor is protected by cooling.
In the present embodiment, the first relay 4 includes a first relay switch 41 and a first relay coil 42. The second relay 7 includes a second relay switch 71 and a second relay coil 72. When the first temperature-controlled switch 3 and the second temperature-controlled switch 6 are closed, the first relay coil 42 and the second relay coil 72 generate heat, and then the first relay switch 41 and the second current collector switch 42 are turned on, which means that the warning lamp 1 is on and/or the power supply of the inverter motor is cut off by the inverter motor control switch. The first relay 4 and the second relay 7 can adopt 24V adjustable temperature controllers.
Since the second threshold is for cutting off the power supply of the inverter motor, the second threshold is greater than the first threshold because the second threshold is brighter than the warning lamp 1 and the subsequent effect is more serious. In general, the first threshold may be set to 55 °, and the second threshold may be set to 70 °.
In the embodiment of the invention, the first temperature control switch 3 is also connected in series with a loudspeaker. Through setting up the speaker, can be so that the electrician on duty can learn the high temperature that has inverter motor when not observing warning light 1, and then go to look over or maintain.
In order to simplify the circuit and save the supporting plate, the first power supply and the second power supply are the same direct current power supply 5, and the first temperature control circuit and the second temperature control circuit are simultaneously powered by the direct current power supply.
Claims (6)
1. A temperature monitoring device for a variable frequency motor of a coal preparation plant is characterized by comprising a first temperature control circuit and a second temperature control circuit;
the first temperature control circuit comprises a first temperature control switch (3), and the first temperature control switch (3) is connected with an alternating current power supply (2) after being connected with a first relay (4) and an alarm lamp (1) in series; the first temperature control switch (3) is also connected with a first power supply in series, and the first temperature control switch (3), the first relay (4) and the first power supply form a first control loop;
the first temperature control switch (3) is connected with a first temperature sensor;
the second temperature control circuit comprises a second temperature control switch (6), and the second temperature control switch (6) is connected with a second relay (7) in series and then is connected with a variable frequency motor control switch (8); the second temperature control switch (6) is also connected in series with a second power supply, and the second temperature control switch (6), a second relay (7) and the second power supply form a second control loop;
the second temperature control switch (6) is connected with a second temperature sensor;
the first temperature sensor and the second temperature sensor are both arranged at the part to be measured of the variable frequency motor;
the first temperature control switch (3) is used for being closed when the measured temperature of the first temperature sensor reaches a first threshold value, and then a circuit is connected through the first relay (4) to enable the alarm lamp (1) to emit alarm light;
and the second temperature control switch (6) is used for being closed when the measured temperature of the second temperature sensor reaches a second threshold value, and then the second relay (7) is used for switching on a circuit to enable the variable frequency motor control switch (8) to switch off the power supply of the variable frequency motor.
2. A coal preparation plant inverter motor temperature monitoring device according to claim 1, characterized in that the first relay (4) comprises a first relay switch (41) and a first relay coil (42).
3. The device for monitoring the temperature of the variable frequency motor of the coal preparation plant according to claim 1,
the second relay (7) includes a second relay switch (71) and a second relay coil (72).
4. The device for monitoring the temperature of the variable frequency motor of the coal preparation plant as claimed in claim 2 or 3, wherein the second threshold value is greater than the first threshold value.
5. The coal preparation plant inverter motor temperature monitoring device of claim 4, characterized in that the first temperature control switch (3) is also connected in series with a loudspeaker.
6. The device for monitoring the temperature of the variable frequency motor of the coal preparation plant according to claim 5, characterized in that the first power supply and the second power supply are the same direct current power supply (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022533882.1U CN213367680U (en) | 2020-11-05 | 2020-11-05 | Coal preparation plant inverter motor temperature monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022533882.1U CN213367680U (en) | 2020-11-05 | 2020-11-05 | Coal preparation plant inverter motor temperature monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213367680U true CN213367680U (en) | 2021-06-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022533882.1U Active CN213367680U (en) | 2020-11-05 | 2020-11-05 | Coal preparation plant inverter motor temperature monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213367680U (en) |
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2020
- 2020-11-05 CN CN202022533882.1U patent/CN213367680U/en active Active
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