CN201461501U - A fan energy saving control device - Google Patents

Abstract

The utility model relates to a fan energy-saving control device, which includes a box body, a panel, and a control panel. Displays and direction control buttons are arranged on the panel. The control panel is arranged inside the box body. The components arranged and connected on the control panel mainly include: Inverter, current sensor, pressure sensor, temperature sensor, power supply, voltage sensor, alarm and controller, among them, the temperature sensor is used to measure the water temperature, the pressure sensor is used to measure the pressure of compressed air, and forms a closed-loop control with the controller, According to the pressure signal measured by the pressure sensor, the controller automatically adjusts the motor speed and the air pressure through the frequency converter. The positive effects of the utility model are: the air compressor system can be monitored in real time, the air pressure can be automatically adjusted, and it has the advantages of energy saving, convenient use, flexible control and high reliability, which can improve the automation level of the whole set of equipment and extend the length of the equipment. service life.

Description

A fan energy saving control device

【Technical field】

The utility model relates to the technical field of electronic instruments and instruments, in particular to an energy-saving control device for fans, which can be used in energy-saving control systems for fans of large-scale enterprises such as power plants, mines, and steel mills.

【Background technique】

In order to save energy and make full use of natural resources, wind turbines are used in many places. But at present, most of the existing air compressor control systems adopt traditional control methods, and the adjustment of air volume adopts mechanical methods, which not only causes waste of energy, but also is inconvenient to control. The frequency conversion control can be used to adjust the motor speed according to the actual production demand, so as to realize the adjustment of the compressed air supply, so that the air compressor can be in the best energy-saving operation state under the premise of meeting the process requirements, and the air pressure can be greatly reduced. The highest working pressure of the machine, so as to achieve the purpose of saving electricity and energy.

【Content of utility model】

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a fan energy-saving control device with the characteristics of flexible control and energy saving.

In order to achieve the above object, the technical scheme that the utility model takes is:

An energy-saving control device for a fan, comprising a box body, a panel, and a control panel. Displays and direction control buttons are arranged on the panel, speakers, start buttons and stop buttons are arranged on the box body, and the control panel is arranged inside the box body. It is characterized in that the components set and connected on the control board mainly include frequency converter, current sensor, pressure sensor, temperature sensor, power supply, voltage sensor, alarm and controller, among which the temperature sensor is used to measure the water temperature, and the pressure sensor It is used to measure the pressure of compressed air and forms a closed-loop control with the controller. According to the pressure signal measured by the pressure sensor, the controller automatically adjusts the motor speed through the frequency converter to adjust the air pressure.

The frequency converter has functions such as phase loss, short circuit, overload and overcurrent protection.

The box body is a box body with a rectangular structure.

The working principle of the utility model is:

The frequency conversion speed regulation system of fan compressor usually takes the output pressure as the control object. The feedback signal obtained by the pressure sensor is connected to the PID regulator of the frequency converter, and compared with the preset pressure signal. After PID adjustment, the sum signal is connected to To the given end of the inverter, so as to determine the working frequency and speed of the motor: when the air volume is small, let the motor rotate slowly; when the air volume is large, let the motor rotate faster, so as to adjust the air pressure and realize The purpose of energy saving. The control scheme of the utility model is a closed-loop control system. The system samples the pressure of the pipe network or the gas storage tank in real time, compares it with the set value, and then controls the speed of the air compressor according to the deviation between the two to realize Automatic constant pressure control mode.

The positive effect of the utility model is:

(1) Using the new monitoring device, the monitoring of the fan system can be realized; the closed-loop control composed of the pressure sensor, frequency converter and controller can realize the automatic adjustment of the air pressure and achieve the purpose of energy saving.

(2) Due to different working conditions, the energy-saving effect is different, but as long as there is no-load situation, energy-saving must be realized.

(3) Realize constant pressure gas supply, improve the quality of gas supply, prevent the occurrence of undervoltage, and help improve product quality.

(4) Reduce the speed of the motor, reduce mechanical impact and wear, prolong the life of the equipment, and reduce the workload and maintenance expenses of equipment maintenance.

(5) The start and stop of the motor frequency conversion has no impact on the equipment and the power grid, and has the advantages of energy saving, convenient use, flexible control and high reliability, which can improve the automation level of the whole set of equipment and prolong the service life of the equipment.

【Description of drawings】

Accompanying drawing 1 is a schematic diagram of the external structure of a fan energy-saving control device of the present invention;

Accompanying drawing 2 is the structural representation of control panel;

Accompanying drawing 3 is the working principle block diagram of a kind of fan energy-saving control device of the present invention;

Accompanying drawing 4 is the wiring diagram of frequency converter main circuit and control circuit;

Accompanying drawing 5 is the circuit wiring diagram of control panel;

The labels in the figure are:

1. Cabinet, 2. Panel, 3. Display, 4. Direction control button,

5. Control board, 6. Inverter, 7. Current sensor, 8. Pressure sensor,

9. Temperature sensor, 10. Power supply, 11. Voltage sensor, 12. Alarm,

13. Controller.

【Detailed ways】

A specific embodiment of a fan energy-saving control device according to the present invention will be given below in conjunction with the accompanying drawings.

See attached drawing 1.

A fan energy-saving control device, comprising a box body 1, a panel 2, a display 3, and a control panel 5. The method for making the box body 1 can be carried out in accordance with existing methods, for example, the box body 1 can be made into a rectangular structure or a rectangular structure : the front is a panel 2, and the other surfaces are housings, and a display 3 and a direction control button 4 are arranged on the panel 2. The present embodiment adopts two displays to display different information separately, and a touch screen display can also be used to directly carry out Control operation; the direction control button 4 is composed of a left direction button and a right direction button, so that the entire panel 2 has a simple structure and centralized information; a loudspeaker opening, a start button and a stop button are arranged on the housing.

The box body 1, the display 3 and the direction control button 4 can be selected from existing parts and/or standard accessories of corresponding models, without special production.

See attached drawing 2.

The control board 5 is arranged inside the box body 2, and the components arranged and connected on the (rectangular) control board 5 mainly include a frequency converter 6, a current sensor 7, a pressure sensor 8, a temperature sensor 9, a power supply 10, a voltage sensor 11, Alarm 12 and controller 13; various sensors transmit signals to the controller, wherein the temperature sensor 9 is used to measure the water temperature, and the pressure sensor 8 is used to measure the pressure of the compressed air, and the controller 13 analyzes and judges according to the obtained signal, To make a state prediction, the frequency converter 6 controls the speed of the motor outside the box 1; the power supply 10 provides power for the frequency converter 6, alarm 12, controller 13 and sensors.

Described frequency converter 6, alarm device 12, controller 13 and various sensors can select the corresponding model that has supply on the existing market for use, only under the situation that can't meet the requirement, just carry out special customization.

See attached drawing 3.

The fan compressor frequency conversion speed regulation system usually takes the output pressure as the control object. The feedback signal obtained by the pressure sensor 8 is connected to the PID regulator of the frequency converter 6, and compared with the preset pressure signal. After PID adjustment, the sum The signal is connected to the given end of the inverter 6 to determine the working frequency and speed of the motor: when the air volume is small, the motor rotates slowly; when the air volume is large, the motor rotates faster, so as to achieve air conditioning Pressure, to achieve the purpose of energy saving.

The utility model is specially designed for the air supply system for stabilizing the pressure of the compressed air pipe network. After the equipment is put into operation, the controller 13 detects the pipe network pressure through the pressure sensor 8, and the air compressor operates with frequency conversion, and controls the speed of the frequency conversion pump through PID to make the pipe network pressure equal to the set pressure value; When the pressure is high, the PID output control signal will increase the output frequency of the inverter, and the pressure of the gas supply pipe network will be equal to the set pressure value by controlling the frequency conversion air compressor; when the pressure of the pipe network is higher than the set pressure, the PID output control signal will be reduced The output frequency of the frequency converter is used to control the frequency conversion air compressor so that the pressure of the gas supply pipe network is equal to the set pressure value.

In order to ensure the heat dissipation of the air compressor motor body, the lower limit of the speed is set in the system. The frequency converter 6 has protection functions such as phase loss, short circuit, overload, and overcurrent. The fan compressor frequency conversion speed regulation system automatically performs PID adjustment to maintain a constant supply air pressure.

See Figure 4 for the wiring of the main circuit and control circuit of the frequency converter.

The power supply voltage is taken from the bus voltage composed of L1, L2, and L3. The main circuit of the frequency converter is mainly composed of fuses, contactors, line reactors, filters, frequency converters 6, and fans. The control circuit is composed of temperature sensors 9 and pressure sensors. 8. The PLC controller 13 and display 3 are composed; the fuse is mainly used for protection in the event of a short circuit or overload fault, the contactor is a master switch for controlling the main circuit and debugging and maintenance, and the line reactor is used to prevent The loop current fluctuates too much and acts as a buffer. The filter is used to filter out high-order harmonics. The inverter 6 obtains the input voltage from L1, L2, and L3, and controls the operation of the fan through U, V, and W frequency conversion outputs. The pressure sensor 8 will The measured actual pressure is converted into a signal of 0-10V and sent to the PLC controller 13, and the PLC controls the power frequency output by the frequency converter 6 as required, thereby controlling the speed of the fan and achieving the purpose of energy saving. At the same time, the temperature and pressure signals are sent to the display 3 for display after being processed by the PLC.

See accompanying drawing 5, the circuit wiring diagram of control panel.

It mainly consists of the following parts:

1. Controller

(1) S7-200PLC host

The PLC uses the CPU224 type of S7-200, which has 24 points, of which 14 points are input and 10 points are output, and 7 expansion modules can be connected, and the maximum expansion can be up to 168 digital I/O points or 35 analog I/O points. O point. 13K bytes program and data storage space. 6 independent 30KHZ high-speed counters, 2 independent 20KZ high-speed pulse outputs, with PID controller, 1 RS-485 communication programming port, with PPI communication protocol, MPI communication protocol and free mode communication ability. The I/O terminal block can be easily disassembled as a whole. It is a controller with strong control capabilities. The powerful functions of the S7-200 enable it to realize complex control functions no matter in independent operation or connected into a network. Therefore, the S7-200 200 has a very high cost performance.

(2) Analog expansion module

The analog expansion module provides the function of input/output, and we choose an EM235 module. The advantages of the EM235 module are: it has the best adaptability and can adapt to complex control occasions; it can be directly connected to sensors and actuators, 12-bit resolution and a variety of input/output ranges can be connected to sensors and actuators without an external amplifier Direct connection, for example, the module can be directly connected with PT100 thermal resistance; flexibility, when the actual application changes, the PLC can be expanded accordingly, and the user program can be adjusted very easily.

The EM235 module has 4 channels of analog input and 1 channel of analog output, in which pressure, temperature, current, and voltage are used as inputs, and the output voltage of 0-10V is used to control the inverter.

(3) Touch screen display

The touch screen display 3 adopts the color LCD screen produced by Schneider Electric Company, the parameters are: 10.4 inches, 1MB user memory, 2MB dynamic RAM, 640×480 pixels; its characteristics are: moderate price, maintenance-free design, backlight life Up to 50,000 hours.

2. Detection parameters

(1) Speed detection

Speed test and display: The speed sensor adopts Hall element, put the magnetic steel on the spindle dial, the counting pulse is input through the I/O terminal of CPU224, and the high-speed counting function and interrupt function of S7-200 are used to calculate 1 second The number of pulses, and then multiplied by 60, is the speed; after software conversion, it is sent to the touch screen for display.

(2) Temperature control and display

Because the motor is in high temperature operation state for a long time, its life will be shortened. Therefore, it is necessary to monitor the temperature of the motor. The utility model monitors the motor temperature through a temperature detection circuit. The on-off of the alarm can be determined according to the comparison between the upper limit of the preset temperature and the measured temperature. When the temperature is higher than the set value, the fan will be started to cool down and the alarm will be given at the same time. The temperature detection circuit consists of a temperature sensor (thermistor) and a temperature/frequency (T/F) conversion circuit. The T/F circuit is used to convert the temperature signal into a frequency signal, and then send it to the PLC high-speed counter, count the frequency in an interrupt mode, and send the temperature signal to the A input terminal of the EM235 module, which can be processed by the PLC through A/D conversion. The digital quantity is sent to the touch screen monitor for display.

(3) Detection of current signal

The current sensor converts the detected current signal output by the wind power generator into a 4-20mA current signal, and sends the signal to the C input terminal of the EM235 module, converts it into a digital quantity through the A/D conversion module, and sends it to the CPU for processing , and displayed on the touch screen display.

(4) Detection of pressure signal

The pressure signal of the fan hydraulic oil detected by the pressure sensor is converted into a 4-20mA current signal, and the signal is sent to the B input terminal of the EM235 module, converted into a digital quantity by the A/D conversion module, sent to the CPU for processing, and displayed on the touch screen display.

(5) Detection of voltage signal

The voltage signal output by the detected wind power generator is converted by the voltage sensor into a 4-20mA current signal, and the signal is sent to the D input terminal of the EM235 module, converted into a digital quantity by the A/D conversion module, sent to the CPU for processing, and Displayed on the touch screen display.

In summary, the utility model can not only realize energy saving, but also help prolong the service life of the equipment.

Claims (2)

1. blower fan energy-saving control device, contain casing, panel, control panel, on panel, be provided with display device and direction control knob, on casing, be provided with loudspeaker, start button and stop button, control panel is arranged on the inside of casing, it is characterized in that, on control panel, be provided with and mainly contain frequency variator with the components and parts that are connected, current sensor, pressure transducer, temperature transducer, power supply, voltage transducer, alarm and controller, wherein, temperature transducer is used for measuring water temperature, pressure transducer is used to measure compressed-air actuated pressure, and constitute closed loop control with controller, the pressure signal that controller records according to pressure transducer by frequency variator self-regulation motor rotating speed, is regulated the pressure of air.

2. a kind of blower fan energy-saving control device according to claim 1 is characterized in that described casing is the casing of rectangular configuration.

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