CN201467065U - Variable frequency control system of air compressor motor - Google Patents
Variable frequency control system of air compressor motor Download PDFInfo
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- CN201467065U CN201467065U CN2009200923904U CN200920092390U CN201467065U CN 201467065 U CN201467065 U CN 201467065U CN 2009200923904 U CN2009200923904 U CN 2009200923904U CN 200920092390 U CN200920092390 U CN 200920092390U CN 201467065 U CN201467065 U CN 201467065U
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- air compressor
- control system
- frequency converter
- compressor motor
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Abstract
The utility model discloses a variable frequency control system of an air compressor motor, which comprises a pressure transmitter, an intelligent controller and an inverter, wherein the input end of the pressure transmitter is used for connecting with the output end of the gas distribution package of an air compressor, and the output end of the pressure transmitter is connected with the input end of the intelligent controller; the output end of the intelligent controller is connected with the input end of the inverter, and the output end of the inverter is used for connecting with the motor. The utility model adopts the inverter to control the speed regulation of the motor, so that the system achieves the constant pressure air supply control and continuous gas supply amount regulation, and always maintains the pipe network pressure above the working pressure capable of meeting gas supply; the air compressor motor can achieve the static work to the rotary work by starting the inverter, so the soft start is achieved, and the mechanical impact on the air compressor caused by the start of impact current can be prevented; and two contactors are arranged in the system to achieve the switching function of work frequency and variable frequency, and the control system has low control and regulation noise, energy saving and stable work.
Description
Technical field
The utility model relates to a kind of control system of air compressor machine, especially a kind of frequency-changing control system of longevity power air compressor motor.
Background technology
The kind of air compressor machine has many, and great majority all are to adopt the air feed control mode that adds, unloads, and for example the fixed screw air compressor of U.S.'s longevity power also is to have adopted this control mode.Institute's air demand of air compressor machine is lower than specified air displacement, exhaust pressure rises, when surpassing the minimum pressure values Pmin (being also referred to as on-load pressure) that sets, the pressure regulator action, to control gas and be transported to intake valve, by the piston in the intake valve, part is closed intake valve, reduce air inflow, make air feed and tend to balance with gas.When line pressure continues the maximum pressure value Pmax (being also referred to as unloading pressure) of rising overpressure by-pass cock setting, pressure regulating switch tripping, electromagnetically operated valve power down.Like this, control gas directly enters intake valve, and air inlet is closed fully; Simultaneously, atmospheric valve is opened under the effect of control gas, and the knockout drum compressed air is bled off.When being reduced to Pmin under the line pressure, pressure regulating switch resets (closure), the electromagnetically operated valve energized, and the control gas that at this moment leads to intake valve and atmospheric valve all is cut off, and intake valve is all opened again like this, and atmospheric valve cuts out, the operation of unit full load.This control mode is regulated intake valve by mechanical system, and air demand can't be regulated continuously, and when gas consumption constantly changed, supply gas pressure produced fluctuation by a relatively large margin inevitably, did not reach technological requirement with the gas precision.Add frequent adjusting intake valve, the wearing and tearing of meeting accelerating charge valve increase maintenance capacity and maintenance cost.And frequent the employing opens and closes vent valve, and the durability of vent valve can not get ensureing.
The air compressor machine for example Starting mode of the fixed screw air compressor of U.S.'s longevity power is star-triangle start mode, the energy consumption height, and noise is big.The pressure that add, the Unloading Control mode makes Compressed Gas changes between Pmin～Pmax back and forth.Pmin is the minimum pressure value, promptly can guarantee the minimum pressure of user's operate as normal.Generally speaking, relation can be represented with following formula between Pmax, the Pmin: Pmax=(1+ δ) Pmin.δ is a percentage, and its numerical value is roughly between 10%～25%.Generally, when pressure reached Pmax, air compressor machine came the step-down unloading by the following method.Close intake valve and make motor be in idling conditions, simultaneously compressed air unnecessary in the knockout drum is passed through atmospheric valve emptying, but motor at this moment moves with rated speed still.According to measuring and calculating, 10%～15% the when energy consumption during the air compressor machine unloading accounts for air compressor machine full-load run clearly loading, unloading under the air feed control mode, and this control method will cause very big energy dissipation and noise.Hence one can see that, the energy of wasting at the air compressor machine that adds, unloads under the air feed control mode mainly is: compressed air pressure surpasses energy that Pmin consumed after pressure reaches Pmin, this control mode determines its pressure can continue rise (up to Pmax), will discharge more heat to the external world in this process, thereby cause energy loss.
The utility model content
The purpose of this utility model provides a kind of frequency-changing control system of air compressor motor, and air compressor machine is carried out constant pressure air feeding control, and energy consumption is low, the precision height.
For achieving the above object, the utility model adopts following technical scheme: a kind of frequency-changing control system of air compressor motor, it is characterized in that: comprise pressure transmitter, intelligent controller, frequency converter, the output of pressure transmitter connects the input of intelligent controller, the output of intelligent controller connects the input of frequency converter, and the output of frequency converter is used for connecting motor.
The power input of described frequency converter is connected with three phase mains by starting contactor.
Also be connected with first contactor between the power input of described frequency converter and the starting contactor.
Also be connected with second contactor between described motor power input and the starting contactor.
Described frequency-changing control system also connects frequency conversion/power frequency switching device shifter.
The switching device shifter of described frequency conversion and power frequency comprises unit switch, and the contact of unit switch is used for being connected with the coil of first contactor or the coil of second contactor.
The output of described frequency converter also is connected with output alarm circuit.
Described output alarm circuit comprises the power transfer relay and the auxiliary relay of frequency converter, insert dc power cathode behind the coil of a normally open contact series connection auxiliary relay of power transfer relay, the other end inserts dc power anode, and the normally closed interlock of auxiliary relay is connected with the coil control circuit of starting contactor.
The input of described frequency converter also is connected with reactor.
The frequency-changing control system of a kind of air compressor motor of the utility model adopts the Frequency Converter Control electric machine speed regulation, makes system realize constant pressure air feeding control, regulates air demand continuously, and ductwork pressure is maintained on the operating pressure that can satisfy air feed all the time.And air compressor motor can be started by frequency converter to rotary work from static, has realized soft start, has avoided starting impulse current and starting the mechanical shock that brings to air compressor machine; Also, two contactors make system have the function of power frequency and frequency conversion switching in the system by being set in frequency converter place in circuit and motor place in circuit; The regulating and controlling noise of this control system is little, conserve energy, working stability.
Description of drawings
Fig. 1 is a circuit theory schematic diagram of the present utility model;
Fig. 2 is a control flow chart of the present utility model;
Embodiment
Being example with longevity power air compressor machine is described in detail the frequency-changing control system of a kind of air compressor motor of the utility model.
As shown in Figure 1, the frequency-changing control system of a kind of air compressor motor of the utility model comprises pressure transmitter 1, intelligent controller 2, frequency converter 3, and the frequency converter 3 in the present embodiment adopts the FRN280P11S-4CX of Fuji type frequency converter; Intelligent controller 2 adopts AL808E type intelligent controller, single channel input, output, be output as 4～20mA analog signal, certainty of measurement 0.2%, intelligent controller is used for the control of conversion device, according in the application system that does not allow the output signal frequent variations, selecting PI regulative mode principle, therefore can only adopt the PI regulative mode, reduce impact to frequency converter; Pressure transmitter 1 adopts DG1300-BZ-A-2-2 type pressure transmitter, range: 0～10Mpa, the analog signal of output 4～20mA, accuracy 0.5%FS.
As shown in Figure 1: the input of pressure transmitter 1 is used for being connected the output that air compressor machine divides gas bag, the output of pressure transmitter 1 connects the input of intelligent controller 2, the output of intelligent controller 2 connects the current input terminal C1 of frequency converter 3, and output load end U, V, the W of frequency converter 3 connect motor M. and main contact 1KM2 (this starting contactor is the starting contactor of the former air compressor machine control unit) back that three phase mains L1, L2, L3 connect starting contactor is connected with power input L1/R, L2/S, the L3/T of frequency converter 3; Also be connected with the contact 1KM4 of first contactor (the frequency conversion conversion is used) between the main contact 1KM2 of starting contactor and power input L1/R, the L2/S of frequency converter, the L3/T; Also be connected with the coil KM4 of contact 1KM5. first contactor of second contactor (power frequency conversion with) and the coil KM5 of second contactor between the main contact 1KM2 of starting contactor and the power input of motor M and be connected access 220AC power supply afterwards with unit switch SA. the auxiliary contact 1KM2-1 of starting contactor and the startup of frequency converter 3/stop to hold FWD, REV, CM connects. also be connected with reactor DK between the reactor input P1 of frequency converter 3 and the P+, suppress harmonic current, improving low frequency conduction anti-interference. the fault alarm output of frequency converter 3 also is connected with the fault alarm output circuit, the internal fault relay and the outside auxiliary relay that comprise frequency converter, the normally open contact 30A of internal fault relay connects the coil KA of auxiliary relay, coil KA other end access-24VDC power supply, power transfer relay 30C access+24VDC power supply. the normally closed interlock KA1 of auxiliary relay and the former startup of motor, stopping the control loop series connection. power supply changeover device 4 (ACT-240020P) is converted to the DC24V DC power supply with AC220V and provides working power for intelligent controller 2 and pressure transmitter 1.
As shown in Figure 1, the utility model adopts variable-frequency control technique that air compressor machine is carried out constant pressure air feeding control, frequency converter 3 is when starting, the coil KM4 of the contact of unit switch SA and contactor is coupled together, even system is in the variable frequency control state, knife switch QF closes, then the coil KM4 of contactor gets, the contact 1KM4 closure of contactor, carry out the preparation before frequency converter starts, when starting air compressor machine, contactor coil KM2 gets, the main contact 1KM2 closure of starting contactor, this moment, the auxiliary contact 1KM2-1 of starting contactor was also closed simultaneously, the power access end L1/R of frequency converter 3, L2/S, the start end FWD of L3/T and frequency converter connects, frequency converter 3 beginning operate as normal, motor M is rotated, and has realized that thus air compressor motor M is started by frequency converter 3 to rotary work from static, has avoided starting impulse current and starting the mechanical shock that brings to air compressor machine.The operation of frequency converter 3 or stop to be by the connection of the auxiliary contact 1KM2-1 of starting contactor or to disconnect and realizing.The current signal that pressure transmitter 1 will divide the pressure of gas bag output to be converted to 4-20mA is transported to intelligent controller 2, through pressure setting signal conveys is given the C1 end of frequency converter 3 again by intelligent controller 2, thereby the size to the frequency of frequency converter 3 is regulated the rotating speed of the motor M of controlling air compressor machine, the motor M of air compressor machine is operated under the infinitely variable speeds state reliably, comes the precision of better controlled air compressor machine force value.When frequency converter 3 has fault output; the power transfer relay action of frequency converter 3 inside; then the normally open contact 30A of power transfer relay, 30C closure; the coil KA of auxiliary relay gets electric adhesive; then normally closed interlock KA1 disconnects; make the coil KM2 decompression outage of starting contactor, the frequency converter outage quits work, thus the safety of the protection electric equipment and the person.When frequency converter 3 breaks down can not use the time, can be connected the contact of unit switch SA with the coil KM5 of contactor, promptly be transformed on the position of power frequency, the contact 1KM5 closure of contactor then, the contact 1KM4 of the contactor that frequency converter is used disconnected and can not work this moment, revert to original star-triangle working method and continue to make motor M work, do not influence normal safety in production.
As shown in Figure 2, the constant pressure air feeding process of this control system: the compressed air that is produced by air compressor machine is introduced into the branch gas bag, enter air accumulator (effect of air accumulator is exactly to lay in compressed air) again by minute gas bag then, again by air accumulator to user (user is the workshop), also can be directly by minute gas bag to the user.The ductwork pressure of the output of the branch gas bag of air compressor machine as controlling object, power supply provides power supply to control system, when user's usefulness gas demand is big, divide the ductwork pressure of the output of gas bag to reduce, it is that the signal of telecommunication is given intelligent controller that pressure transmitter will divide the ductwork pressure signal transition of gas bag, intelligent controller and pressure set points are made comparisons, then the difference of pressure set points and value of feedback increases, intelligent controller also carries out computing according to the size of difference by set PID control model, output valve increases, the control signal that produces flows to frequency converter, and then frequency converter is by the rotating speed of output voltage and reverse frequency adjustment motor, and the output frequency of frequency converter increases, the motor speed of air compressor machine raises, then the air mass flow of air compressor machine increases, thereby pipeline air pressure is tended towards stability, and promptly actual pressure maintains setting pressure all the time.When user's usefulness gas demand hour, course of action is opposite.
Claims (9)
1. the frequency-changing control system of an air compressor motor, it is characterized in that: comprise pressure transmitter, intelligent controller, frequency converter, the output of pressure transmitter connects the input of intelligent controller, the output of intelligent controller connects the input of frequency converter, and the output of frequency converter is used for connecting motor.
2. the frequency-changing control system of a kind of air compressor motor according to claim 1, it is characterized in that: the power input of described frequency converter is connected with three phase mains by starting contactor.
3. the frequency-changing control system of a kind of air compressor motor according to claim 2 is characterized in that: also be connected with first contactor between the power input of described frequency converter and the starting contactor.
4. the frequency-changing control system of a kind of air compressor motor according to claim 3 is characterized in that: also be connected with second contactor between described motor power input and the starting contactor.
5. the frequency-changing control system of a kind of air compressor motor according to claim 4, it is characterized in that: described frequency-changing control system also connects frequency conversion/power frequency switching device shifter.
6. the frequency-changing control system of a kind of air compressor motor according to claim 5, it is characterized in that: the switching device shifter of described frequency conversion and power frequency comprises unit switch, and the contact of unit switch is used for being connected with the coil of first contactor or the coil of second contactor.
7. according to the frequency-changing control system of the arbitrary described a kind of air compressor motor of claim 1 to 6, it is characterized in that: the output of described frequency converter also is connected with output alarm circuit.
8. the frequency-changing control system of a kind of air compressor motor according to claim 7, it is characterized in that: described output alarm circuit comprises the power transfer relay and the auxiliary relay of frequency converter, insert dc power cathode behind the coil of a normally open contact series connection auxiliary relay of power transfer relay, the other end inserts dc power anode, and the normally closed interlock of auxiliary relay is connected with the coil control circuit of starting contactor.
9. the frequency-changing control system of a kind of air compressor motor according to claim 8, it is characterized in that: the input of described frequency converter also is connected with reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200923904U CN201467065U (en) | 2009-08-14 | 2009-08-14 | Variable frequency control system of air compressor motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200923904U CN201467065U (en) | 2009-08-14 | 2009-08-14 | Variable frequency control system of air compressor motor |
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| CN201467065U true CN201467065U (en) | 2010-05-12 |
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| CN2009200923904U Expired - Lifetime CN201467065U (en) | 2009-08-14 | 2009-08-14 | Variable frequency control system of air compressor motor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255602A (en) * | 2011-07-26 | 2011-11-23 | 深圳市海浦蒙特科技有限公司 | Method and system for smoothly switching alternated current motor from frequency converter power supply to power-frequency power supply |
| CN103423138A (en) * | 2012-04-17 | 2013-12-04 | 苏州徕卡节能电气技术有限公司 | Energy-saving intelligent control device of air compressor |
| CN104373330A (en) * | 2013-08-14 | 2015-02-25 | 青岛海普润机械有限公司 | Air compressor control device and method |
| CN108980022A (en) * | 2018-09-14 | 2018-12-11 | 沧州市供水排水集团有限公司 | A kind of manual apparatus for fast switching of frequency converter pump |
| CN110608160A (en) * | 2019-09-05 | 2019-12-24 | 上海泾铎科技有限公司 | Control method and device for main motor of air compressor set |
| CN113641154A (en) * | 2021-07-20 | 2021-11-12 | 浙江浙能嘉华发电有限公司 | Start-stop circuit for air compressor DCS (distributed control System) and DCS control method |
| CN113638904A (en) * | 2021-10-18 | 2021-11-12 | 亿昇(天津)科技有限公司 | Control method, device and system of centrifugal air compressor |
| WO2023202063A1 (en) * | 2022-04-20 | 2023-10-26 | 中车青岛四方机车车辆股份有限公司 | Active redundant air conditioning unit and control method |
-
2009
- 2009-08-14 CN CN2009200923904U patent/CN201467065U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255602A (en) * | 2011-07-26 | 2011-11-23 | 深圳市海浦蒙特科技有限公司 | Method and system for smoothly switching alternated current motor from frequency converter power supply to power-frequency power supply |
| CN103423138A (en) * | 2012-04-17 | 2013-12-04 | 苏州徕卡节能电气技术有限公司 | Energy-saving intelligent control device of air compressor |
| CN104373330A (en) * | 2013-08-14 | 2015-02-25 | 青岛海普润机械有限公司 | Air compressor control device and method |
| CN108980022A (en) * | 2018-09-14 | 2018-12-11 | 沧州市供水排水集团有限公司 | A kind of manual apparatus for fast switching of frequency converter pump |
| CN110608160A (en) * | 2019-09-05 | 2019-12-24 | 上海泾铎科技有限公司 | Control method and device for main motor of air compressor set |
| CN113641154A (en) * | 2021-07-20 | 2021-11-12 | 浙江浙能嘉华发电有限公司 | Start-stop circuit for air compressor DCS (distributed control System) and DCS control method |
| CN113641154B (en) * | 2021-07-20 | 2023-07-25 | 浙江浙能嘉华发电有限公司 | Start-stop circuit for DCS system of air compressor and DCS control method |
| CN113638904A (en) * | 2021-10-18 | 2021-11-12 | 亿昇(天津)科技有限公司 | Control method, device and system of centrifugal air compressor |
| WO2023202063A1 (en) * | 2022-04-20 | 2023-10-26 | 中车青岛四方机车车辆股份有限公司 | Active redundant air conditioning unit and control method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 450000 Yulin South Road, Henan, Zheng Dong, No. 16 South Road, Zhengzhou Patentee after: China Tobacco Henan Industrial Co., Ltd. Address before: 450000 Zhengzhou agricultural road, Henan, No. 29 Patentee before: China Tobacco Henan Industrial Co., Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100512 |