CN212337699U - Automatic control device of industrial fan - Google Patents
Automatic control device of industrial fan Download PDFInfo
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- CN212337699U CN212337699U CN201922433410.6U CN201922433410U CN212337699U CN 212337699 U CN212337699 U CN 212337699U CN 201922433410 U CN201922433410 U CN 201922433410U CN 212337699 U CN212337699 U CN 212337699U
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- contactor
- frequency converter
- industrial fan
- thermal overload
- overload relay
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Abstract
The utility model discloses an automatic control device of industrial fan, it is including converter, contactor, thermal overload relay, industrial fan, audible-visual annunciator, selection switch, contactor coil, thermal overload relay auxiliary contact, power, temperature sensor and humidity transducer. The industrial fan adopts a variable frequency motor; the frequency converter is provided with an analog input port, a switching value input port and a switching value output port; the power supply is connected to the input end of the frequency converter and is simultaneously connected to the selection switch and the contactor coil; the selection switch is provided with a plurality of position gears which are respectively connected into a single or a plurality of contactor coils; the power output end of the frequency converter is connected to the input end of the contactor; the temperature sensor and the humidity sensor are connected to an analog input port of the frequency converter; the output end of the contactor is connected with the input end of the thermal overload relay, and the output end of the thermal overload relay is connected to the variable frequency motor of the industrial fan. The device has the characteristics of simple structure, good cooling and dehumidifying effects and the like.
Description
Technical Field
The utility model relates to a controlling means of industrial fan, especially an automatic control device of industrial fan.
Background
Industrial fans are increasingly used in large spaces such as logistics, storage and workshops due to their advantages of large coverage area, low energy consumption and capability of forming natural breeze. The conventional industrial fan mostly adopts a fixed-frequency motor and is directly powered by a power supply of a power grid, and the mode has the defects that the fan always runs at a uniform speed, energy is not saved, the rotating speed can not be adjusted according to actual working conditions, and the use is not humanized. With the development of the variable frequency speed regulation technology, more and more industrial fans adopt variable frequency motors, more frequency converters are applied to the control of the industrial fans, a potentiometer is externally connected to each frequency converter, the output frequency of each frequency converter is changed by manually adjusting the potentiometer, and therefore the rotating speed of the motor is adjusted to achieve the purpose of adjusting the rotating speed of the fans. This approach solves the problem of non-adjustable rotation speed, but also has the disadvantages: the potentiometer needs to be manually adjusted according to actual conditions, manual participation is needed, time and labor are wasted, and the humidity of the sealed storage occasion is difficult to be manually controlled, so that the ventilation effect is not ideal if the adjustment is not reasonable. At present, a mode that one frequency converter is provided with one industrial fan is generally adopted, and for some occasions that the industrial fan is low in use frequency or the industrial fan is used with main and standby functions, if each fan is provided with one frequency converter, the early investment is increased and the resource waste is caused.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an effectual automatic control device of industrial fan.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: the device comprises a frequency converter, a contactor, a thermal overload relay, an industrial fan, an audible and visual alarm, a selection switch, a contactor coil, an auxiliary contact of the thermal overload relay, a power supply, a temperature sensor and a humidity sensor; the industrial fan adopts a variable frequency motor; the frequency converter is provided with an analog input port, a switching value input port and a switching value output port and can receive signals of 0-20 mA or 0-10V and binary switching value signals; the temperature sensor can measure the temperature and output a signal of 0-20 mA or 0-10V; the humidity sensor can measure humidity and output a signal of 0-20 mA or 0-10V; the power supply is connected to the input end of the frequency converter and is simultaneously connected to the selection switch and the contactor coil; the selection switch is provided with a plurality of position gears which are respectively connected with at least one contactor coil; the power output end of the frequency converter is connected to the input end of the contactor; the temperature sensor and the humidity sensor are connected to an analog input port of the frequency converter; the output end of the contactor is connected with the input end of the thermal overload relay, and the output end of the thermal overload relay is connected to the variable frequency motor of the industrial fan.
Contactor, industrial fan, thermal overload relay, contactor coil and thermal overload relay auxiliary contact all at least one and quantity equal.
The input signal of the temperature sensor in the frequency converter is a main frequency source, and the input signal of the humidity sensor is an auxiliary frequency source; and the larger value of the main frequency source and the auxiliary frequency source is the output frequency of the frequency converter.
The frequency converter is also connected with an audible and visual alarm.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the utility model can automatically adjust the output frequency according to the temperature and humidity value frequency converter to adjust the rotating speed of the fan; meanwhile, one frequency converter can be switched to drive one or more fans to work in a combined mode through an external selection switch, and the problems that the rotating speed of an industrial fan is constant, the rotating speed needs to be adjusted manually or is inaccurate in adjustment and the resource allocation is unreasonable are effectively solved. The utility model discloses reach industrial fan rotational speed automatically regulated, need not artificial intervention, automatic alarm and remind, reduce the purpose that the converter used quantity under certain occasion. The utility model discloses can control the rotational speed of industrial fan as required effectively, have simple structure, characteristics such as cooling dehumidification is effectual.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram of the system structure of the present invention.
In the figure: AI1, AI 2-analog input ports; BO1 — switching volume output; BI1, BI2, BI3 — switching value input ports.
Detailed Description
As shown in fig. 1, the automatic control device of the industrial fan comprises a frequency converter, a contactor, a thermal overload relay, an industrial fan, an audible and visual alarm, a selection switch, a contactor coil, an auxiliary contact of the thermal overload relay, a power supply, a temperature sensor and a humidity sensor. The contactor, the industrial fan, the thermal overload relay, the contactor coil and the auxiliary contact of the thermal overload relay are at least one to adapt to different spaces; for example, as shown in fig. 1, the contactor, the industrial fan, the thermal overload relay, the contactor coil, and the thermal overload relay normally closed auxiliary contact are three, and are respectively a first contactor, a second contactor, a third contactor, a first industrial fan, a second industrial fan, a third industrial fan, a first thermal overload relay, a second thermal overload relay, a third thermal overload relay, a first contactor coil, a second contactor coil, a third contactor coil, a first thermal overload relay auxiliary contact, a second thermal overload relay auxiliary contact, and a third thermal overload relay auxiliary contact. The industrial fan adopts a variable frequency motor, and the output rotating speed can be changed according to the frequency of an input power supply. The input end of the frequency converter comprises a power supply input port, an analog input port AI1, an analog input port AI2, a switching value input port BI1, a switching value input port BI2, a switching value output port BI3, a switching value output port BO1 and a power supply output port; the frequency converter can receive signals of 0-20 mA or 0-10V and binary switching value signals. As shown in fig. 1, the power supply is connected to the power input port of the frequency converter to supply power to the frequency converter; and the power supply is connected to the selection switch, the first contactor coil, the second contactor coil and the third contactor coil to supply power to the selection switch, the first contactor coil, the second contactor coil and the third contactor coil. The temperature sensor is connected to the analog input port AI1 of the frequency converter, and the humidity sensor is connected to the analog input port AI2 of the frequency converter. The first thermal overload relay auxiliary contact, the second thermal overload relay auxiliary contact and the third thermal overload relay auxiliary contact are respectively connected to switching value input ports BI1, BI2 and BI3 of the frequency converter. And a binary output port BO1 of the frequency converter is connected with an audible and visual alarm. And a power output port of the frequency converter is connected to input ends of the first contactor, the second contactor and the third contactor. And the output ends of the first contactor, the second contactor and the third contactor are respectively connected to the input ends of the first thermal overload relay, the second thermal overload relay and the third thermal overload relay. And the output ends of the first thermal overload relay, the second thermal overload relay and the third thermal overload relay are connected to the first industrial fan, the second industrial fan and the third industrial fan. The contactor is a main contact corresponding to a contactor coil; the auxiliary contact of the thermal overload relay is a normally closed auxiliary contact of the corresponding thermal overload relay. The gear of the selector switch can be set according to the number and requirements of the industrial fans, so that the selector switch can control one or more motors of the industrial fans; as shown in fig. 1, the selection switch is provided with 7 gears, and can be respectively connected with the first contactor coil, the second contactor coil or the third contactor coil, or any two of the contactor coils, and can also be simultaneously connected with three contactor coils; therefore, one frequency converter can be selected to control any one, any two or three motors. The contact of the selection switch is connected, the coil of the contactor is electrified, the corresponding main contact of the contactor is closed, the thermal overload relay connected with the contactor is electrified, and after the frequency converter operates, the industrial fan connected with the frequency converter is electrified and started; when the operation of other fans needs to be started and switched or the combination of a plurality of fans is operated, the frequency converter is closed firstly, then the position of the selector switch is switched, meanwhile, the corresponding contactor coil is electrified, the corresponding contactor main contact is closed, the corresponding thermal overload relay is electrified, after the frequency converter is operated, the industrial fan connected with the current power supply is started, and the switching of different fans is realized.
As shown in FIG. 1, the temperature sensor 20 of the automatic control device of the industrial fan can measure the indoor temperature and output a temperature signal of 0-20 mA or 0-10V; the humidity sensor 21 can measure indoor humidity and output a temperature signal of 0-20 mA or 0-10V; the frequency converter 1 is provided with more than 2 analog input ports AI1 and AI2 and can receive signals of 0-20 mA or 0-10V. Presetting a curve of a frequency range corresponding to 0-20 mA or 0-10V in a frequency converter; if the temperature sensor and the humidity sensor are arranged at the same time, the analog input ports AI1 and AI2 of the frequency converter 1 are respectively set as a main frequency source and an auxiliary frequency source, and the larger value of the current or the larger value of the voltage of the main frequency source and the auxiliary frequency source is taken as the frequency of the output power supply of the frequency converter. When the indoor temperature/humidity changes, the current or voltage signal input into the frequency converter changes, so that the frequency of the output power supply of the frequency converter is changed to achieve the purpose of adjusting the rotating speed of the fan. The thermal overload relay is used for detecting whether the circuit has over-current and over-heat conditions, and when the over-current and over-heat conditions occur, the thermal overload relay is switched off, and the corresponding industrial fan stops running; and meanwhile, the state of the auxiliary contact of the thermal overload relay input into the frequency converter is changed, and the current fault of the frequency converter is informed. When the frequency converter breaks down or a normally closed auxiliary contact of a certain thermal overload relay is disconnected, a binary output port BO1 of the frequency converter outputs a signal to the audible and visual alarm 6 to remind an operator of overhauling. Before the frequency converter is started, selecting an industrial fan to be put into operation through a selection switch, when the selection switch selects 1 gear, electrifying a first contactor coil, closing a first contactor, and supplying power to the first industrial fan after the frequency converter is started; when the selection switch selects the 2-gear, the coil of the second contactor is electrified, the second contactor is closed, and power is supplied to the second industrial fan after the frequency converter is started; when the selection switch selects the 3-gear, the coil of the third contactor is electrified, the third contactor is closed, and power is supplied to the third industrial fan after the frequency converter is started; when the selection switch selects 4 gears, the first contactor coil and the second contactor coil are electrified, the first contactor and the second contactor are closed, and power is supplied to the first industrial fan and the second industrial fan after the frequency converter is started; when the selection switch selects 5 grades, the first contactor coil and the third contactor coil are electrified, the first contactor and the third contactor are closed, and power is supplied to the first industrial fan and the third industrial fan after the frequency converter is started; when the selection switch selects 6 gears, the second contactor coil and the third contactor coil are electrified, the second contactor and the third contactor are closed, and power is supplied to the second industrial fan and the third industrial fan after the frequency converter is started; when the selection switch selects 7 grades, the first contactor coil, the second contactor coil and the third contactor coil are electrified, the first contactor, the second contactor and the third contactor are closed, and the first industrial fan, the second industrial fan and the third industrial fan are simultaneously powered after the frequency converter is started. After the structure is adopted, a plurality of industrial fans can be arranged at different positions of a workshop as required; and according to the requirement of actual conditions, the opening or closing of fans at different places is controlled through gear selection of the selector switch, so that the fine management of the temperature and the humidity inside the workshop is realized.
The work flow of the automatic control device of the industrial fan is as follows:
step (1): the industrial fan which is put into operation is selected through the selection switch.
Step (2): starting a power supply; and supplying power to the frequency converter through the power supply.
And (3): and starting the frequency converter.
And (4): and the frequency converter analog input port receives the temperature signal/humidity signal, and calculates the corresponding frequency of the frequency converter output power supply at the moment according to a preset curve.
And (5): and the frequency converter supplies power to the selected industrial fan according to the frequency calculated in the previous step.
And (6): the frequency converter continuously detects whether the temperature/humidity signal of the input analog quantity port changes or not; if the change occurs, turning to the step (4); if no change has occurred, the previous frequency output continues to be maintained.
And (7): whether the frequency converter receives a shutdown instruction or not; if the shutdown instruction is not received, turning to the step (6), and continuously detecting the analog input port of the frequency converter; and if a shutdown instruction is received, all the processes are ended, and the frequency converter stops supplying power to the selected industrial fan.
Claims (4)
1. An automatic control device of an industrial fan is characterized in that: the device comprises a frequency converter, a contactor, a thermal overload relay, an industrial fan, an audible and visual alarm, a selection switch, a contactor coil, an auxiliary contact of the thermal overload relay, a power supply, a temperature sensor and a humidity sensor; the industrial fan adopts a variable frequency motor; the frequency converter is provided with an analog input port, a switching value input port and a switching value output port and can receive signals of 0-20 mA or 0-10V and binary switching value signals; the temperature sensor can measure the temperature and output a signal of 0-20 mA or 0-10V; the humidity sensor can measure humidity and output a signal of 0-20 mA or 0-10V; the power supply is connected to the input end of the frequency converter and is simultaneously connected to the selection switch and the contactor coil; the selection switch is provided with a plurality of position gears which are respectively connected with at least one contactor coil; the power output end of the frequency converter is connected to the input end of the contactor; the temperature sensor and the humidity sensor are connected to an analog input port of the frequency converter; the output end of the contactor is connected with the input end of the thermal overload relay, and the output end of the thermal overload relay is connected to the variable frequency motor of the industrial fan.
2. The automatic control device of an industrial fan according to claim 1, wherein: the contactor, the industrial fan, the thermal overload relay, the contactor coil and the thermal overload relay auxiliary contact are equal in number and are at least one.
3. The automatic control device of an industrial fan according to claim 1, wherein: an input signal of a temperature sensor in the frequency converter is a main frequency source, and an input signal of the humidity sensor is an auxiliary frequency source; and the larger value of the main frequency source and the auxiliary frequency source is the output frequency of the frequency converter.
4. An automatic control device of an industrial fan according to claim 1, 2 or 3, characterized in that: the frequency converter is also connected with an audible and visual alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922433410.6U CN212337699U (en) | 2019-12-30 | 2019-12-30 | Automatic control device of industrial fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922433410.6U CN212337699U (en) | 2019-12-30 | 2019-12-30 | Automatic control device of industrial fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212337699U true CN212337699U (en) | 2021-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922433410.6U Active CN212337699U (en) | 2019-12-30 | 2019-12-30 | Automatic control device of industrial fan |
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| Country | Link |
|---|---|
| CN (1) | CN212337699U (en) |
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2019
- 2019-12-30 CN CN201922433410.6U patent/CN212337699U/en active Active
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