Generally used pumps, the rated flow when the equipment is selected, usually exceeds the actual flow required, and because the process needs to change the flow during operation, and the current use of baffles to regulate the flow of the adjustment method is more common, although the method is simple, but In fact, the purpose of regulation is to increase the resistance by artificially increasing the resistance. This kind of throttling regulation method wastes a large amount of electric energy, and recycling of this part of electric energy loss will receive a large energy saving effect.
It is known from the principles of fluid mechanics that there are the following relationships between pump flow rate, motor speed, and motor power:
Q1/Q2 = n1/n2 H1/H2 = (n1/n2)2 P1/P2 = (n1/n2)3
Where Q -- flow rate H -- head P -- motor shaft power n -- motor speed When a small flow rate is required, the frequency conversion pump is used to reduce the pump speed and the input power of the motor is reduced accordingly. If the flow rate is reduced to 80%, the rotation speed (n) will also drop to 80%, and the shaft power will drop to 51% of the rated power; if the flow rate drops to 50%, the shaft power will drop to 13% of the rated power, and its energy saving potential It is very large. Therefore, for pumps with larger flow adjustment range, the use of variable-frequency speed-adjusting energy-saving control devices instead of damper adjustment is a relatively good way to achieve energy conservation.
Drive pumps, most of the three-phase AC asynchronous motor, and some three-phase AC synchronous motor. The rotation speed of the motor is proportional to the frequency f of the power supply. Changing the power supply frequency of the motor stator changes the rotation speed of the motor. The frequency conversion speed control and energy saving control device converts the 50 Hz AC frequency of the power grid into an adjustable frequency and adjustable voltage. AC power to drive the motor to achieve the water pump to regulate the flow.
The frequency conversion speed-adjusting energy-saving control device is characterized by high efficiency, no additional slip loss caused by the speed regulation, large speed range, high precision can achieve stepless speed regulation, and easy to implement coordinated control and closed-loop control. Because the original squirrel-cage motor can be used, it is particularly suitable for the technical transformation of the old equipment, it not only maintains the original motor structure is simple, reliable and durable, easy maintenance advantages, but also to achieve the remarkable effect of saving electricity, is the pump AC speed The ideal way to save energy. Inverter Application in Bearing Machinery (Yangshan Bearing Factory) Bearing Processing Machinery Motor Spindle Features:
1) The speed is fast (it can be in 18000 to 24000r/min), the voltage is low (below 220V), the acceleration/deceleration time is short, and the current is not large.
2) The external environment is poor. Metal powder and coolant are everywhere. The inverter can easily be damaged due to an internal short circuit. In consideration of various factors, it is recommended to use the bearing inverter used by Jiaxin Co., Ltd. products. Bearing Machine Frequency Inverter (JX-G) Features:
3) The frequency range of speed regulation is wide, and the maximum frequency can be adjusted to 400Hz. For a 2-pole spindle, the maximum speed is 24000 r/min, which meets the requirements of users;
4) The maximum output voltage can be adjusted in the range of 40-100%: If the value of function code F04 is set to 50, the maximum output voltage is 190V (50% of the input voltage);
5) The basic frequency is adjustable: According to the frequency requirement of the spindle motor, it can be arbitrarily adjustable between 50-400Hz, and it can be adjusted and used together with the maximum output voltage to obtain a suitable V/F curve;
6) The acceleration and deceleration time can be adjusted: According to the equipment needs, the acceleration time can be adjusted to less than 2 seconds, and the deceleration time can be adjusted to less than 2 seconds. For faster deceleration, an external braking resistor can be provided, and the braking unit inverter is built-in.
7) The enclosure is enclosed, the wiring part is filled with rubber rings, and the cooling air duct is separated from the internal components of the inverter, which can effectively reduce and prevent the metal powder and water vapor in the environment from entering the inverter and prolong the service life of the inverter. Cooling Tower Fan Converter Retrofitting Cooling Tower Fans for Central Air Conditioning Generally do not adjust the speed so that the fan motors run at full speed under any weather conditions and temperatures. In the high temperature period, they play a very good cooling effect, but in the morning and evening In rainy weather, the fan motor running at full speed brings about a large temperature drop. People have to turn off the cold air valve, causing great waste at this time. Moreover, during the entire working season of central air-conditioning, the real need for full-time operation is only a small part. Therefore, in order to save energy, it is necessary to transform the cooling tower fan. Requirement: Target reconstruction plan: Installation temperature change time at the outlet. Modification target: A company in Puyang, Henan Province ordered two cooling tower motor frequency conversion automatic control systems from our company. Each control system includes one each of 3KW and 4KW inverters. The system is required to automatically adjust the operating frequency of the motor based on the temperature of the cooling tower outlet measured by the temperature sensor so that the outlet temperature remains constant at 33°C. Implementation plan: Use the JX-P series inverter and temperature transmitter produced by Schwab to form the control system. Install a temperature transmitter at the outlet of the cooling tower and adjust the transmitter's range 0-50 degrees to correspond to 0-20mA current output. The temperature signal is transmitted to the PID feedback terminal of the inverter, and the corresponding range value at 33°C is converted into a percentage value of 66. Set the function code F40 of the inverter to 66 and F34 to 3 (4-20mA current feedback PID control).
It is known from the principles of fluid mechanics that there are the following relationships between pump flow rate, motor speed, and motor power:
Q1/Q2 = n1/n2 H1/H2 = (n1/n2)2 P1/P2 = (n1/n2)3
Where Q -- flow rate H -- head P -- motor shaft power n -- motor speed When a small flow rate is required, the frequency conversion pump is used to reduce the pump speed and the input power of the motor is reduced accordingly. If the flow rate is reduced to 80%, the rotation speed (n) will also drop to 80%, and the shaft power will drop to 51% of the rated power; if the flow rate drops to 50%, the shaft power will drop to 13% of the rated power, and its energy saving potential It is very large. Therefore, for pumps with larger flow adjustment range, the use of variable-frequency speed-adjusting energy-saving control devices instead of damper adjustment is a relatively good way to achieve energy conservation.
Drive pumps, most of the three-phase AC asynchronous motor, and some three-phase AC synchronous motor. The rotation speed of the motor is proportional to the frequency f of the power supply. Changing the power supply frequency of the motor stator changes the rotation speed of the motor. The frequency conversion speed control and energy saving control device converts the 50 Hz AC frequency of the power grid into an adjustable frequency and adjustable voltage. AC power to drive the motor to achieve the water pump to regulate the flow.
The frequency conversion speed-adjusting energy-saving control device is characterized by high efficiency, no additional slip loss caused by the speed regulation, large speed range, high precision can achieve stepless speed regulation, and easy to implement coordinated control and closed-loop control. Because the original squirrel-cage motor can be used, it is particularly suitable for the technical transformation of the old equipment, it not only maintains the original motor structure is simple, reliable and durable, easy maintenance advantages, but also to achieve the remarkable effect of saving electricity, is the pump AC speed The ideal way to save energy. Inverter Application in Bearing Machinery (Yangshan Bearing Factory) Bearing Processing Machinery Motor Spindle Features:
1) The speed is fast (it can be in 18000 to 24000r/min), the voltage is low (below 220V), the acceleration/deceleration time is short, and the current is not large.
2) The external environment is poor. Metal powder and coolant are everywhere. The inverter can easily be damaged due to an internal short circuit. In consideration of various factors, it is recommended to use the bearing inverter used by Jiaxin Co., Ltd. products. Bearing Machine Frequency Inverter (JX-G) Features:
3) The frequency range of speed regulation is wide, and the maximum frequency can be adjusted to 400Hz. For a 2-pole spindle, the maximum speed is 24000 r/min, which meets the requirements of users;
4) The maximum output voltage can be adjusted in the range of 40-100%: If the value of function code F04 is set to 50, the maximum output voltage is 190V (50% of the input voltage);
5) The basic frequency is adjustable: According to the frequency requirement of the spindle motor, it can be arbitrarily adjustable between 50-400Hz, and it can be adjusted and used together with the maximum output voltage to obtain a suitable V/F curve;
6) The acceleration and deceleration time can be adjusted: According to the equipment needs, the acceleration time can be adjusted to less than 2 seconds, and the deceleration time can be adjusted to less than 2 seconds. For faster deceleration, an external braking resistor can be provided, and the braking unit inverter is built-in.
7) The enclosure is enclosed, the wiring part is filled with rubber rings, and the cooling air duct is separated from the internal components of the inverter, which can effectively reduce and prevent the metal powder and water vapor in the environment from entering the inverter and prolong the service life of the inverter. Cooling Tower Fan Converter Retrofitting Cooling Tower Fans for Central Air Conditioning Generally do not adjust the speed so that the fan motors run at full speed under any weather conditions and temperatures. In the high temperature period, they play a very good cooling effect, but in the morning and evening In rainy weather, the fan motor running at full speed brings about a large temperature drop. People have to turn off the cold air valve, causing great waste at this time. Moreover, during the entire working season of central air-conditioning, the real need for full-time operation is only a small part. Therefore, in order to save energy, it is necessary to transform the cooling tower fan. Requirement: Target reconstruction plan: Installation temperature change time at the outlet. Modification target: A company in Puyang, Henan Province ordered two cooling tower motor frequency conversion automatic control systems from our company. Each control system includes one each of 3KW and 4KW inverters. The system is required to automatically adjust the operating frequency of the motor based on the temperature of the cooling tower outlet measured by the temperature sensor so that the outlet temperature remains constant at 33°C. Implementation plan: Use the JX-P series inverter and temperature transmitter produced by Schwab to form the control system. Install a temperature transmitter at the outlet of the cooling tower and adjust the transmitter's range 0-50 degrees to correspond to 0-20mA current output. The temperature signal is transmitted to the PID feedback terminal of the inverter, and the corresponding range value at 33°C is converted into a percentage value of 66. Set the function code F40 of the inverter to 66 and F34 to 3 (4-20mA current feedback PID control).