CN204984900U - Screw compressor frequency conversion control system - Google Patents
Screw compressor frequency conversion control system Download PDFInfo
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- CN204984900U CN204984900U CN201520550628.9U CN201520550628U CN204984900U CN 204984900 U CN204984900 U CN 204984900U CN 201520550628 U CN201520550628 U CN 201520550628U CN 204984900 U CN204984900 U CN 204984900U
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- air compressor
- pressure
- screw air
- frequency
- gas holder
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
The utility model relates to a screw compressor frequency conversion control system, including screw compressor, the gas holder, pressure transmitter, a frequency converter, a motor, a crankshaft position sensor, a switching power supply and a digital frequency meter, the PID regulator, screw compressor passes through the pipe connection gas holder, the installation pressure transmitter of gas holder jar mouth department, pressure transmitter detects the pressure of gas holder and conveys the regulator to PID with the pressure value, the PID regulator is according to predetermined pressure value and the pressure value output control volume that detects, the rotational speed of screw compressor motor is controlled to the converter according to the electric current of the corresponding frequency of controlled quantity output of PID regulator output, thereby control screw compressor's delivery pressure. The screw compressor delivery pressure is controlled to rotational speed according to the pressure automatically regulated screw compressor motor of gas holder, and the fluctuation of pipe network atmospheric pressure is within 0.01Mpa, the impact that the pipe network was not stressed and suddenlys change can also be ensured to the PID regulatory function, has prolonged the life of pipe network, has reduced cost of maintenance.
Description
Technical field
The utility model relates to a kind of frequency-changing control system, especially a kind of screw air compressor frequency-changing control system.
Background technique
Screw air compressor is very general in the application of enterprise, is mainly enterprise and provides production gas.Production due to enterprise is continuously continual, therefore requires that screw air compressor runs throughout the year continuously.If out of service, gently then affect production, heavy then cause device damage even casualties.When selecting the motor capacity of screw air compressor at the beginning of designing, normally according to equipment at full capacity long-play select, therefore design capacity is general all bigger than normal.In actual motion, the load factor of motor is on the low side, and ratio shared by the time of light running is very large.Screw air compressor generally adjusts mouth pressure by adjustment outlet portal aperture.When outlet portal aperture reduces, the operate power of motor reduces and seldom, screw air compressor operates in inefficient state, causes a large amount of waste of energy.
Model utility content
The technical problems to be solved in the utility model is to provide a kind of screw air compressor frequency-changing control system, greatly can improve the operational efficiency of screw air compressor motor, play energy-conservation effect, and reduces the wearing and tearing of machinery, the life-span of extension device.
In order to solve the problems of the technologies described above, the technical solution of the utility model is:
A kind of screw air compressor frequency-changing control system, comprises screw air compressor, gas holder, pressure transmitter and frequency variator, also comprises PID regulator.Screw air compressor connects gas holder by pipeline, gas holder tank mouth place setting pressure transmitter, pressure transmitter detects reservoir pressure and force value is sent to PID regulator, PID regulator exports controlled quentity controlled variable according to the force value preset and the force value detected, the electric current of the controlled quentity controlled variable output corresponding frequencies that frequency variator exports according to PID regulator controls the rotating speed of screw air compressor motor, thus controls the delivery pressure of screw air compressor.
Preferably, gas holder tank mouth installs valve air relief, and when air pressure is too high, valve air relief is opened with the safety ensureing screw air compressor.
Preferably, described pressure transmitter is amperometric sensor, exports 4-20mA standard industrial process signals, and antijamming capability is strong, to ensure the reliability of air supply system.
Preferably, frequency variator is equipped with auto by pass cabinet, and when frequency converter failure, screw air compressor can automatically switch to power frequency bypass and run.
Preferably, described preset pressure value can be set by user according to practical condition on PID regulator panel, easy and simple to handle.
In addition, usual frequency variator all possesses clockwise and anticlockwise function, answers turning to of rigorous concentration motor in the debugging of screw air compressor, should verify motor steering when frequency variator starts in advance, forbids motor antiport, avoids the heavy losses causing main process equipment.
The utility model is in conjunction with PID regulator and frequency variator, and the rotating speed according to the automatic adjusting screw rod air compressor motor of the pressure of gas holder controls screw air compressor delivery pressure, and pipe network air pressure fluctuation is within 0.01Mpa; PID regulatory function can also guarantee pipe network be not stressed sudden change impact, extend the working life of pipe network, reduce maintenance cost; Frequency variator is equipped with auto by pass cabinet, and when frequency converter failure, screw air compressor can automatically switch to power frequency bypass and run, and ensures the reliability of air supply system.
Accompanying drawing explanation
Fig. 1 is that the utility model embodiment 1 forms schematic diagram.
Fig. 2 is that the utility model embodiment 2 forms schematic diagram.
Fig. 3 is that the utility model embodiment 3 forms schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Embodiment 1:
A kind of screw air compressor frequency-changing control system, as shown in Figure 1, comprises screw air compressor, gas holder, pressure transmitter and frequency variator, also comprises PID regulator.Screw air compressor connects gas holder by pipeline, gas holder tank mouth place setting pressure transmitter, pressure transmitter detects reservoir pressure and force value is sent to PID regulator, PID regulator exports controlled quentity controlled variable according to the force value preset and the force value detected, the electric current of the controlled quentity controlled variable output corresponding frequencies that frequency variator exports according to PID regulator controls the rotating speed of screw air compressor motor, thus controls the delivery pressure of screw air compressor.
Preferably, gas holder tank mouth installs valve air relief, and when air pressure is too high, valve air relief is opened with the safety ensureing screw air compressor.
Preferably, described pressure transmitter is amperometric sensor, exports 4-20mA standard industrial process signals, and antijamming capability is strong, to ensure the reliability of air supply system.
Preferably, frequency variator is equipped with auto by pass cabinet, and when frequency converter failure, screw air compressor can automatically switch to power frequency bypass and run.
Preferably, described preset pressure value can be set by user according to practical condition on PID regulator panel, easy and simple to handle.
PID regulator be by regulate Proportional coefficient K p, intergration time Ti and derivative time Td, make input quantity c (t) be substantially equal to predetermined amount c (∞), with limit overshoot, reduce the number of oscillation and burr.When setting PID regulator parameter, with the parameter of PID regulator and the qualitative relationships between dynamic performance and steady-state behaviour for foundation, suitable parameter should be determined by test of many times.
Embodiment 2:
Current a lot of frequency variator all internal PID regulatory functions on the market, therefore also can select the frequency variator of internal PID regulatory function.
A kind of screw air compressor frequency-changing control system, as shown in Figure 2, comprise screw air compressor, gas holder, pressure transmitter and frequency variator, wherein frequency variator has PID regulatory function.Screw air compressor connects gas holder by pipeline, gas holder tank mouth place setting pressure transmitter, pressure transmitter detects reservoir pressure and force value is sent to frequency variator, the PID adjustment module of frequency variator controls the rotating speed of screw air compressor motor according to the force value preset and the electric current of the force value output corresponding frequencies detected, thus controls the delivery pressure of screw air compressor.
Described preset pressure value can be set by user according to practical condition on frequency variator operating platform, easy and simple to handle.
Embodiment 3:
The utility model is applicable equally for screw air compressing unit, below for three screw air compressing units.
A kind of screw air compressor frequency-changing control system, as shown in Figure 3, comprise three screw air compressors (being numbered No. 1, No. 2, No. 3 respectively), gas holder, pressure transmitter and frequency variator, wherein frequency variator has PID regulatory function.No. 1, No. 2 screw air compressors are by 50Hz ac power supply, and No. 3 screw air compressors are powered by frequency variator out-put supply.Three screw air compressors all connect gas holder by pipeline, gas holder tank mouth place setting pressure transmitter, pressure transmitter detects reservoir pressure and force value is sent to frequency variator, the PID adjustment module of frequency variator controls the rotating speed of wherein No. 3 screw air compressor motors according to the force value preset and the electric current of the force value output corresponding frequencies detected, thus controls its delivery pressure.
Suppose that a specified delivery pressure of screw air compressor is 1Mpa, so the total specified delivery pressure of three screw air compressors be incorporated into the power networks is 3Mpa.If desired system delivery pressure is 2.5Mpa, then ensure No. 1, No. 2 oeprations at full load, makes No. 3 screw air compressor delivery pressures be stabilized in 0.5Mpa by setting preset pressure value; If desired system delivery pressure is 1.5Mpa, then manually can disconnect or be exported the power supply controlling disconnection No. 1 or No. 2 screw air compressor by frequency variator IO, then makes No. 3 screw air compressor delivery pressures be stabilized in 0.5Mpa by setting preset pressure value; If desired system delivery pressure is 0.5Mpa, then manually can disconnect or be exported the power supply controlling disconnection No. 1 and No. 2 screw air compressor by frequency variator IO, then makes No. 3 screw air compressor delivery pressures be stabilized in 0.5Mpa by setting preset pressure value.Above-mentioned numerical value is ideal situation, and actual conditions should be as the criterion with field practice.
The above, be only specific embodiment of the utility model, but protection domain of the present utility model is not limited thereto, and any change of expecting without creative work or replacement, all should be encompassed within protection domain of the present utility model.Therefore, the protection domain that protection domain of the present utility model should limit with claims is as the criterion.
Claims (5)
1. a screw air compressor frequency-changing control system, comprise screw air compressor, gas holder, pressure transmitter and frequency variator, it is characterized in that: also comprise PID regulator, screw air compressor connects gas holder by pipeline, gas holder tank mouth place setting pressure transmitter, pressure transmitter detects the pressure of gas holder and force value is sent to PID regulator, PID regulator exports controlled quentity controlled variable according to the force value preset and the force value detected, the electric current of the controlled quentity controlled variable output corresponding frequencies that frequency variator exports according to PID regulator controls the rotating speed of screw air compressor motor, thus control the delivery pressure of screw air compressor.
2. screw air compressor frequency-changing control system according to claim 1, is characterized in that: gas holder tank mouth installs valve air relief, and when air pressure is too high, valve air relief is opened with the safety ensureing screw air compressor.
3. screw air compressor frequency-changing control system according to claim 1, is characterized in that: described pressure transmitter is amperometric sensor, exports 4-20mA standard industrial process signals.
4. screw air compressor frequency-changing control system according to claim 1, is characterized in that: frequency variator is equipped with auto by pass cabinet, and when frequency converter failure, screw air compressor can automatically switch to power frequency bypass and run.
5. screw air compressor frequency-changing control system according to claim 1, is characterized in that: described preset pressure value can be set by user according to practical condition on PID regulator panel, easy and simple to handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520550628.9U CN204984900U (en) | 2015-07-24 | 2015-07-24 | Screw compressor frequency conversion control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520550628.9U CN204984900U (en) | 2015-07-24 | 2015-07-24 | Screw compressor frequency conversion control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204984900U true CN204984900U (en) | 2016-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520550628.9U Expired - Fee Related CN204984900U (en) | 2015-07-24 | 2015-07-24 | Screw compressor frequency conversion control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204984900U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106609754A (en) * | 2015-07-24 | 2017-05-03 | 池州汉诺威机电设备科技有限公司 | Screw rod air compressor frequency conversion control system |
| CN109751243A (en) * | 2019-03-21 | 2019-05-14 | 丰电科技集团股份有限公司 | A kind of energy-saving spray whelk rod-type air compressor control system |
-
2015
- 2015-07-24 CN CN201520550628.9U patent/CN204984900U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106609754A (en) * | 2015-07-24 | 2017-05-03 | 池州汉诺威机电设备科技有限公司 | Screw rod air compressor frequency conversion control system |
| CN109751243A (en) * | 2019-03-21 | 2019-05-14 | 丰电科技集团股份有限公司 | A kind of energy-saving spray whelk rod-type air compressor control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20160724 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |