CN1307369C - Compressor frequency-converting control device - Google Patents
Compressor frequency-converting control device Download PDFInfo
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- CN1307369C CN1307369C CNB021247676A CN02124767A CN1307369C CN 1307369 C CN1307369 C CN 1307369C CN B021247676 A CNB021247676 A CN B021247676A CN 02124767 A CN02124767 A CN 02124767A CN 1307369 C CN1307369 C CN 1307369C
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Abstract
The present invention relates to a compressor frequency-converting control device, the present invention has an alternate current compressor which is connected with a frequency converter, and the rotation speed of a motor is controlled by an output frequency of the frequency converter. Particularly, the compressor frequency-converting control device is combined with an arithmetic device and a logic controller for controlling the frequency converter and the compressor, and the motor rotation speed of the compressor is changed appropriately according to feedback signals of the compressor to control the output frequency of the frequency converter to convert the frequency relatively.
Description
[technical field]
The present invention relates to a kind of compressor frequency-converting control device, particularly relate to a kind of can be by the control frequency variator output frequency, reach the motor rotary speed of accurate control compressor and effectively save the compressor frequency-converting control device of the energy.
[background technique]
Compressor not only kind is a lot, and it is general to have many uses too, and various air compressors, gas compressor or refrigeration compressor etc. all are the application area of compressor.And the refrigeration compressor (hereinafter to be referred as compressor) that uses with regard to general small-sized air conditioner, it typically uses a direct current motor and drives compressor, just can remove drive motor after therefore must converting alternating voltage (civil power) to a direct current voltage earlier.But because the traditional cold mechanism of qi in the running; the mode of its control room temperature is to be lower than a predefined value when room temperature drops to; when for example spending than predefined value low 3, compressor promptly can shut down, and is elevated to above predefined value up to room temperature; when for example spending than predefined value high 3; compressor is entry into service again, yet this kind control mode makes us not only feeling that difference variation is too big and feel ill; and compressor not only damages but also power consumption more under shutting down repeatedly, starting easily.Therefore, a kind of what is called " inverter compressor " is arisen at the historic moment.But this inverter compressor is owing to be to use a direct current motor, so in fact be not genuine frequency conversion, but the mode of utilizing the operation cycle (DutyCycle) that changes the VDC of delivering to d.c. motor changes the rotating speed of d.c. motor in good time, make when the relative preset temperature of room temperature is low the rotating speed of motor is slack-off, and room temperature relatively the rotating speed of the high seasonal motor of this preset temperature accelerate, whereby, control room temperature one more among a small circle in the variation, make the motor can continuous running and the effect of power saving in good time and reach, so above-mentioned compressor can only be said so a kind of " pressure swing type compressor ".And, because above-mentioned compressor is to use the d.c. motor that has only fraction horsepower, and can't on industrial large-scale machine, use.Therefore, also can't on industrial large-scale machine, use logical on the large-scale machine.Therefore, on large-scale machine, use the bigger AC compressor of horsepower usually.But present AC compressor does not but have the function of frequency conversion, thus can produce above-mentioned traditional compressor can't be when system requirements change, the problem that effectively descends of electric energy that motor is consumed.
In addition, in present compressor control method, no matter be frequency conversion or non-frequency compressor, when unusual condition takes place, except send warning signal or the jumping machine, other contingency approach does not make that the user must be under the machine of jumping situation, promptly reconnoitre maintenance, so that compressor recovers running at short notice as early as possible.
[summary of the invention]
The motor rotary speed that the object of the present invention is to provide a kind of frequency output, reaches accurate control AC compressor and equal proportion is saved the compressor frequency-converting control device of the energy by the control frequency variator.
The invention provides a kind of compressor frequency-converting control device, wherein this compressor is an AC compressor, and it is connected with a frequency variator, and is subjected to the output frequency of this frequency variator to control its motor rotary speed.Particularly, this compressor frequency-converting control device is in conjunction with an arithmetic mean unit and a logic controller, in order to control this frequency variator and compressor, it changes the motor rotary speed of compressor in good time according to the relative frequency conversion of output frequency of feedback signal of compressor control frequency variator, thus, reach the motor rotary speed of accurate control compressor and the purpose that equal proportion is saved the energy.
[accompanying drawing summary]
Be elaborated below by most preferred embodiment and accompanying drawing compressor frequency-converting control device to the present invention, in the accompanying drawing:
Fig. 1 is an embodiment the frequency-converting control device of compressor variable frequency controlling method of the present invention and device thereof and the circuit block diagram of compressor and frequency variator;
Fig. 2 is the frequency-converting control device and the wiring diagram thereof of present embodiment;
Fig. 3 is the control panel schematic representation of the frequency-converting control device of present embodiment;
Fig. 4 is the control flow of the frequency-converting control device of present embodiment.
[embodiment]
Consult shown in Figure 1, it is an embodiment's of compressor frequency-converting control device of the present invention circuit block diagram, wherein this compressor 1 is an AC compressor, it is mainly used on the large-scale machine and has an alternating current motor that can produce high-power (figure does not show), in the present embodiment, this compressor 1 is connected with a frequency variator 2, and this frequency variator 2 can change its output frequency according to the control signal of an input, and changes rotating speed relatively with the motor of this output frequency control compressor 1.And because the working principle of general AC compressor and frequency variator should be conventionally known to one of skill in the art, so do not add explanation at this.And compressor frequency-converting control device 3 of the present invention (hereinafter to be referred as frequency-converting control device 3), promptly be in order to control frequency variator 2, make frequency variator 2 change its output frequency relatively, and then the motor of control compressor 1 change rotating speed relatively according to the control signal of frequency-converting control device 3 outputs.
Consult shown in Figure 2ly, frequency-converting control device 3 of the present invention can be described as a kind of FUZZY (bluring) controller, and wherein main have an arithmetic mean unit and a logic controller in conjunction with (integrating in other words).This arithmetic mean unit is actually by combined type PID (proportional-integral-differential) controller and is constituted, general PID controller is normally by one to two ratio unit, integral unit and differentiation element etc. three partly formed, and drive by the feedback signal of system command and controlled device institute is common, and remove to control controlled device by the output signal that separately output stack forms system, but because overshoot (toning) phenomenon takes place in general PID controller easily, system is vibrated near desired value, cause system's instability, and cause the controlled motor rotary speed unstabilization, and effectively power saving.Therefore, what the combined type PID controller that the present invention uses was different with above-mentioned general PID controller is, it is made up of a plurality of proportional controllers, a plurality of integral controller and a plurality of derivative controller, and the characteristic of this combined type PID controller is after the feedback signal process multiple arithmetic of these ratios, integration and derivative controller of input, to make system finally can accurately reach desired value and tend towards stability, and can not produce overshoot (toning) phenomenon.Therefore, when combined type PID controller compares computing to one by the feedback signal of controlled plant output and an expected value, the control signal that it produced can accurately be controlled this controlled plant and reach an expected value.
This logic controller then includes the required control logic function of various compressors, in order to detect and to weigh the various states of compressor, with the work of in good time control compressor.And as shown in Figure 2, in the present embodiment, frequency-converting control device 3 is to be made in the single-chip, and implant in the circuit board (figure do not show) and become a VFC module, and this combined type PID controller and logic controller can be realized and be built in this single-chip that is the frequency-converting control device 3 with software program or hardware logic mode respectively.Moreover as shown in Figure 2, this frequency-converting control device 3 is provided with some external connector when practical application, and the purposes of each contact is as follows:
JP1：
R:AC, 1ph, 220V, input terminal.
T: form the loop with R.
FG: ground wire.
JP2：
ALM:COMMON TRIP output contact, a contact.
CM1: concurrent.
OIL_SV: oily stop valve, cooling water solenoid valve action connection point, a contact.
CM2: concurrent.
NULL: reserve contact.
CM3: reserve contact.
FAN_RUN: fan running contact, a contact.
CM4: concurrent.
INV_RUN: frequency variator running contact, a contact.
CM5: concurrent.
SV1: empty and load solenoid valve, bleeder valve, reflux valve contact, a contact.
CM6: concurrent.
The input connecting end:
1. reserve.
2. reserve.
3. reserve.1,2,3 for frozen water machine or heat pump PT100 Ω temperature back coupling use.
4.TC1_C: exhaust high temperature escape contact PT100 Ω.
5.TC1_B: exhaust high temperature escape contact PT100 Ω.
6.TC1_A: exhaust high temperature escape contact PT100 Ω.
7.0V1:0V power supply.
8. reserve.
9. reserve.8,9 use for RS485.
10.OUT: output voltage.With 7 be connected to altogether and become device analogy frequently input contact.
11.IN2: back coupling 4～20mA.
12. reserve.
13.+24V: back coupling 4～20Ma input supply voltage.
14.COM: concurrent.
15.S_LOW: air inlet pressure drop pressure switch hypotony contact.
16.MOTOR_HT: motor coil temperature excessive temperature make and break contact.
17.NO_WATER: the dehydration make and break contact.
18.RESET: cresset involution contact.
19.A/O_SEP: deaerator differential pressure switch contact.
20.OIL_FILTER: oil strainer differential pressure switch contact.
21.S_FILTER: air intake filter differential pressure switch contact.
22.INV: frequency variator is unusual, the signal input.
23.FAN: fan is unusual, the signal input.
24.OFF: remote control stop signal contact.
25.ON: remote control CRANK PULSES contact.15～No. 25 contact is a concurrent with No. 14 contacts all.
And for example shown in Figure 3, frequency-converting control device 3, that is VFC module, be typically provided with an external control panel for user's operating and setting, which is provided with a plurality of control buttons that are electrically connected with frequency-converting control device 3 internal circuits, and the function title of these control buttons can be done change according to application demand, and with the example that is applied as of control compressor, the function of each control button on this control panel is following listed:
Tutorial light:
(1.RUN running): the running indication, to press after the running key, the running tutorial light is bright, and the expression unit enters operating condition.
(2.STOP stopping): stop indication, system has powered but in halted state.
3.ELECTRIC FAIL (electrical failure): when frequency variator or motor hinder and when jumping machine, by the indication of electrical failure lamp, simultaneity factor is shut down for some reason.
4.AUTO STOP (autostop): under full-automatic operation mode, unit is shut down then bright this tutorial light for a long time as crossing because of empty wagons.
5.FAN FAIL (fan failure): when radiation fan was jumped machine, this tutorial light was bright, and simultaneity factor is shut down.
6.AIR HIGH TEMPERATURE (exhaust high temperature): if compressor exhaust temperature is too high, tutorial light is bright.
7.AIR FILTER (air inlet filter core): because of obstruction pressure reduction when excessive, this tutorial light promptly begins flicker at the air inlet filter core, and so that warning function to be provided, but system still can turn round, and do not jump machine.
8.COOLING WATER FAIL (dehydration indication): if chilled(cooling) water supply (CWS) is interrupted, then tutorial light is bright, and simultaneity factor is shut down.
9.OIL FILTER (oil strainer): when oil strainer because of obstruction pressure reduction when excessive, this tutorial light promptly begins flicker, so that warning function to be provided, but system still can turn round, and do not jump machine.
10.MOTOR HIGH TEMPERATURE (motor high temperature): when the motor coil temperature surpassed setting value, tutorial light lighted, and unit is jumped machine simultaneously.
11.AIR/OIL SEPARATOR (oil gas filter core): deaerator is because of obstruction pressure reduction when excessive, and this tutorial light promptly begins flicker, and so that warning function to be provided, but system still can turn round, and do not jump machine.
12.SUCTION PRESSURE ABNORMAL (air inlet pressure drop): when gas compressor suction pressures such as refrigeration compressor or pressure-increasing machine were unusual, this lamp promptly glimmered, simultaneity factor is shut down.
(13.SPARE standby tutorial light): use when other control logics are provided.
14.DECREASE LOADING (load shedding): when machine was jumped because of reaching the load shedding limit by system, this tutorial light promptly lighted.
Button:
(1.RUN running): by this key, system's entry into service.
(2.STOP stopping): by this key, then system-down.
3.SET, rise ▲, decline and＜P key can be used for revising setting pressure, timer time and operating parameters.
The LED digital display board:
1.PV: system's real-world operation force value.
2.SP: the force value of default.
Certainly, above-mentioned the required operating parameters of various compressors also can be imported in the frequency-converting control device 3 by button except starting and hold function, to reach the running effect of Cui.
Then, with reference to shown in Figure 4, it is the control flow chart of frequency-converting control device 3 controls one AC compressor, as shown in the figure, its control program is as follows: " unusually " situation that when compressor starts at the beginning, meets then makes compressor jump machine, otherwise first open drive, up to there being " unusually " that just jumping machine takes place, not so, promptly do the level pressure running according to PID controller setting value.
Simultaneously, compressor can output one feedback signal be given frequency-converting control device 3 in operation process, and in the present embodiment, this feedback signal is a pressure signal, this pressure signal is admitted to and compares in this PID controller (being arithmetic mean unit) and the computing action, and produce a control signal to frequency variator, do the level pressure running with the control compressor according to PID controller setting value.And when compressor is following time of situation at empty wagons; make the compressor open drive at minimum speed; whether is the pressure when judging this minimum speed then " lower than PID controller setting value "? if; then do the level pressure running according to PID controller setting value; do you otherwise whether judge compressor " surpassing the empty wagons set time "? be, then make the compressor autostop, and when pressure " is lower than PID controller setting value "; make compressor start automatically, and get back to the open drive state.In addition, when doing level pressure when running according to PID controller setting value, when compressor receives " increase in demand " signal, and when needing to improve its motor rotary speed, the PID controller can send the control signal of a rising rotating speed and give frequency variator, improves rotating speed with the motor that changes output frequency and control compressor.Otherwise, receive " demand minimizing " signal and when need reducing its motor rotary speed, the PID controller promptly sends a control signal that reduces rotating speed and gives frequency variator when compressor, reduce output frequency and reduce rotating speed with the motor of control compressor.In addition, under the situation of doing the level pressure running according to PID controller setting value, when meeting " unusually " situation, jump machine, otherwise make compressor shut down again by empty wagons after the stop key.In addition, when system takes place unusual and this is not that fault by compressor is caused unusually, but the motor that makes compressor is fully loaded with at maximum speed, 3000rpm for example, make that the load current of motor is too high, and meet frequency-converting control device 3 when presetting the condition of " speed setting value falls in arrival ", frequency-converting control device 3 promptly sends a control signal and sets the maximum speed of motor for one than the slow-speed of revolution, so that the maximum speed of motor reduces, so, the rotating speed of motor promptly can " be got back to setting value " (promptly than the slow-speed of revolution) is following and its load current is decreased.At this moment, unless when the system exception value " reaches the capping value " (promptly reaching the CLV ceiling limit value that set to reduce maximum speed), just can make compressor jump machine.For this load shedding function, below more detailed description will be arranged.
So, when traditional AC compressor of not having frequency conversion function arrange in pairs or groups a frequency variator and install frequency-converting control device 3 of the present invention after, promptly become one and can change its motor rotary speed according to system's feedback signal in good time and can accurately control the inverter compressor of its delivery pressure or temperature.
Therefore, by the control flow of above-mentioned frequency-converting control device 3 as can be known, frequency-converting control device 3 is by receiving a feedback signal (may be pressure signal or temperature signal etc.) of compressor output, and this signal comes the pressure transducer of comfortable compressor air-discharging end or the frozen water temperature transducer of frozen water machine, and passes to frequency-converting control device 3 after converting this pressure (or temperature) to a feedback signal.Frequency-converting control device 3 promptly utilizes combined type PID controller that this feedback signal and an expected value are compared computing, and this expected value person of typically using expects that compressor reaches expected value and compares computing, and this expected value person of typically using expects the setting value that compressor reaches.Therefore, working principle according to combined type PID, after feedback signal can be subtracted each other generation one error signal with expected value earlier, via proportional controller this error signal and a constant are multiplied each other again, and after the computing through multiple derivative controller and integral controller, produce one and control signal to frequency variator, changing its output frequency relatively, and make the motor rotary speed of compressor change to the requirement that meets this expected value according to this control signal.Thereby can accurately control the output of AC compressor, make compressor under the condition of keeping accurate pressure or temperature, the energy that its system consumed also can change over the almost increase and decrease of equal proportion with motor rotary speed, and reaches the purpose of energy saving.
In addition, as described above, frequency-converting control device 1 is except the function with the frequency conversion of control AC compressor, the function of load shedding also is provided for its unit, this function can make unit when running into non-fault unusual, mode by reducing unit performance and sounding a warning allows the user under the situation of not jumping machine, can and keep in repair than calm strain.Below especially exemplified by example it is described.
Example one: when frequency-converting control device 3 is applied to the compressor air-discharging level pressure
One of great advantage of inverter compressor is that exhaust pressure is under the condition of level pressure, can adjust the motor rotary speed of compressor according to the variation of outlet air quantity, suppose that its speed range is decided to be 1000rpm～3000rpm, then 3000rpm is fully loaded rotating speed, this promptly represents, under normal condition, frequency-changeable compressor can be done speed change according to the outlet air quantity between 1000rpm～3000rpm.Yet, when the suction pressure of compressor is fully loaded with when 3000rpm makes its load current too high because of the undesired reason of system makes compressor, general present existing compressor all with the jumping machine as in response to, just often can start shooting once more up to system recovery.But because the system suction pressure changes not is that the fault of compressor itself causes; do not need hard stop; therefore; frequency-converting control device 3 of the present invention more designs a load shedding function; it can be according to the variation of compressor inlet end pressure; utilize an air inlet pressure sensor pressure sensor and return a feedback signal and give frequency-converting control device 3; the PID controller is according to the difference of preset parameters and feedback signal; and produce the maximum speed that a control signal removes to reduce compressor; for example make its speed range adjust to 1000rpm～2800rpm, and definite value or mobility adjustment are done in the visual suction pressure variation of this maximum speed that is lowered from 1000rpm～3000rpm.Therefore, because after motor rotary speed is lowered, load current also will decrease, thereby can avoid that to change the electric current that is caused too high because of suction pressure.Unless after reducing rotating speed, system's suction pressure value changes all too greatly, then make compressor when changing maximum value (be suction pressure and reference value differ reach maximum set value), just jump machine, during less than this maximum value, still can do mobility control between than the slow-speed of revolution and standard maximum speed one, and when reducing maximum speed, send warning signal and remind the user.
Example two: when frequency-converting control device 3 is used in frozen water machine outlet constant temperature
The frozen water machine is to use the refrigeration compressor compressed refrigerant, and through condenser with after the refrigerant cools liquefaction, pass through expansion valve again to vaporizer, and in vaporizer, allow refrigeration agent and water or other media do heat exchange, and then this cooled frozen water is delivered to the occasion that need carry out air-conditioning or cooling.No matter and be frequency conversion frozen water machine or inverter air conditioner, all be to adopt fixing a certain running value, the fixing mode of frozen water outlet temperature or gas outlet temperature for example, and then be worth according to this running and do frequency conversion.With aforementioned, the rotating speed of supposing frequency-changeable compressor is 1000rpm～3000rpm, and then the rotating speed of refrigeration compressor can be looked the frozen water variation of temperature and do automatic increase and decrease between 1000rpm～3000rpm.Yet; because condensation need use extraneous cooling water or air to do cooling; when condenser incrustation raises the cooling water air temperature; condensing temperature also can and then improve; condensing temperature improves will make pressure raise, and the refrigeration compressor outlet temperature is raise, after temperature is increased to certain certain value; be the protection compressor, the present practice all is to make compressor jump machine.But condenser incrustation but is not the fault of compressor own to be caused, does not need to shut down therefore and immediately.So, by frequency-converting control device 3 of the present invention, can be according to the delivery temperature of compressor outlet, frequency-converting control device 3 is given in passback after utilizing a temperature transducer that the temperature that senses is changed into a feedback signal, after making its parameter of contrasting input in advance, produce a control signal and remove to reduce the maximum speed of compressor, and its rotating speed is adjusted to 1000rpm～2800rpm, and the visual delivery temperature of this maximum speed or pressure are done the adjustment of definite value or mobility.Because reduce after the rotating speed, the load current of motor also decreases, and the volume of the cooling medium of outlet can reduce, so condensing pressure or condensing temperature can reduce.Unless condensing pressure or condensing temperature still constantly are increased to a certain higher value, just make system jump machine.
Similarly, when frequency-converting control device 3 uses at frequency conversion heat pump, then can condenser hot water or the hot air outlet temperature be benchmark, and with other unusual conditions as the reference value of falling maximum speed.
Therefore, frequency-converting control device 3 utilizes and falls maximum speed to reduce the function of fully loaded or other characteristics, all are the units that make frequency conversion drive, be under the operating condition of benchmark with a certain output characteristics, if meet unusual condition, and this unusual condition is not from compressor itself, and be to make the frequency conversion unit obtain to alleviate by reducing maximum speed, then can be according to user's demand, according to preliminary setting parameter, select some unusual condition be target with as the function of falling maximum speed, treat the machine of just jumping when situation is more serious.
In addition, though the maximum speed function of falling of frequency-converting control device 3 has the under normal circumstances fully loaded characteristic of possibility reduction frequency conversion unit, but can provide the user the longer abnormal response processing time.With the frequency conversion main frame of air-conditioning system, when system because of causing load shedding to elevate the temperature unusually, always than the machine of jumping causes office to become good that big baking box comes because of system.
Moreover the present invention's frequency-converting control device 3 has been implemented, and can be by practical application on traditional compressor, the inner setting of being done in the time of below will enumerating frequency-converting control device 3 at the different application example.
When (one) being applied to spiral air compressor
1.SV:7.00----air compressor will be exported level pressure in 7Kg/cm
2G
14.SRC:2---LED show the force value of feedbacking
15.L-Hz:0---frequency variator lowest frequency value
16.HIP1:0.5---air compressor will be in 7.5Kg/cm
2The G empty wagons
17.SSR:16---pressure transmitter specification 0～16Kg/cm
2G
18.LOAD:0---suction pressure is a barometric pressure
19.L-HI:0---do not use load shedding
20.IDP:0---when L-HI is made as 0, do not use this setting value
21.T1:20---press stop key shut down in 20 seconds afterwards
22.T2:20---pressed after the initiate key first empty wagons 20 seconds
23.T3:300---open drive surpasses 300 seconds automatic stopping then
24.T4:0---do not detect oil pressure
25.T5:10---the dehydration switch surpasses 10 seconds machines of promptly jumping that are not excited
26.T6:300---the action of air inlet pressure drop switch surpasses 300 seconds jumping machines
27.TC:90---compressor exhaust temperature surpasses 90 ℃ of jumping machines
28.TCBA:0---not preset temperature revisal
29.AOUT:100---output voltage 100%
30.TC-R:100---temperature feedbacks 100%
31.YUNN:0---compressor application software
When (two) being applied to gas-booster
1.SV:15.00---pressure-increasing machine output level pressure is in 15Kg/cm
2G
2.～15. parameter is with (one)---
16.HIP1:1.0---pressure-increasing machine will be in 16Kg/cm
2The G empty wagons
17.SSR:16---pressure transmitter specification 0-16Kg/cm
2
18.LOAD:6.0---suction pressure is 6Kg/cm
2G
19.L-HI:2.0---load shedding is extremely than 6Kg/cm
2G hangs down 2Kg/cm
2G jumps machine
20.IDP:1---suction pressure is lower than 6Kg/cm
2G
21.～23. with (one)
24.T4:5---being lower than setting value in 5 seconds, oil pressure then jumps machine
25.26. with (one)
27.TC:140---compressor exhaust temperature surpasses 140 ℃ of jumping machines
28.～31. with (one)
When (three) being applied to the frozen water machine
1.SV:6.00 frozen water outlet constant temperature is in 6 ℃
2.～13. parameter is with (one)
14.SRC:4---LED show back coupling frozen water temperature
15. with (one)
16.HIP1:2---the frozen water machine will be in 4 ℃ of empty wagons
17.SSR:0---working pressure conveyer not
18.LOAD:4---suction pressure is 4Kg/cm
2G
19.L-HI:3---load shedding is extremely than 4Kg/cm
2G hangs down 3Kg/cm
2G jumps machine
20.IDP:1---suction pressure is lower than 4Kg/cm
2G begins load shedding
21.～23. with (one)
24.T4:5---being lower than setting value in 5 seconds, oil pressure then jumps machine
25.26. with (one)
27.TC:110---compressor exhaust temperature surpasses 110 ℃ of jumping machines
28.～30. with (one)
31.YUNN:1---frozen water machine application software
In sum, the present invention's frequency-converting control device 3 combines by the logic controller that a combined type PID controller and is had the required various control functions of compressor and is built in the single-chip, not only have precision height, the fast reliable characteristic of product that reaches of reaction, and frequency-converting control device 3 can change the motor rotary speed of the compressor of controlled system according to the output frequency that the feedback signal of controlled system is controlled frequency variator, reach purposes such as accurate pilot pressure or temperature, and its validity can adjust according to user demand.Owing to the change of motor rotary speed, under the condition of keeping accurate pressure or temperature, the energy that system consumed also can change over the almost increase and decrease of equal proportion with rotating speed, and reaches the purpose of energy saving simultaneously.In addition, utilize the load shedding function of frequency-converting control device 3, make unit when running into non-fault unusual, can reduce unit performance and rotating speed earlier and sound a warning, so that user's strain more at leisure under the situation of not jumping machine.
Claims (5)
1, a kind of compressor frequency-converting control device, wherein this compressor is an AC compressor, it is connected with a frequency variator, and controls its motor rotary speed by the output frequency of this frequency variator, it is characterized in that:
This compressor frequency-converting control device is in conjunction with a combined type proportional-integral derivative controller and a logic controller, wherein this combined type proportional-integral derivative controller is in order to receive the feedback signal from compressor, subtracted each other with expected value earlier and produced an error signal, via proportional controller this error signal and a constant are multiplied each other again, and, control this output frequency and change to the motor rotary speed that meets this expected value requirement through after multiple derivative controller and the integral controller computing.
2, compressor frequency-converting control device as claimed in claim 1 is characterized in that: this arithmetic mean unit and logic controller can be realized by software mode.
3, compressor frequency-converting control device as claimed in claim 1 is characterized in that: this arithmetic mean unit and logic controller can be realized by hardware mode.
4, compressor frequency-converting control device as claimed in claim 1, it is characterized in that: also can in the arithmetic mean unit of this compressor frequency-converting control device, preset one than the slow-speed of revolution, make when compressor is fully loaded with at maximum speed because of the unusual of non-fault own and makes its load current too high, make this arithmetic mean unit send a control signal maximum speed of compressor is made as this than the slow-speed of revolution, and the load current of compressor can be decreased.
5, compressor frequency-converting control device as claimed in claim 4 is characterized in that: be somebody's turn to do the adjustment of doing definite value or mobility than the delivery temperature or the pressure of the visual compressor of the slow-speed of revolution.
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| CNB021247676A CN1307369C (en) | 2002-06-24 | 2002-06-24 | Compressor frequency-converting control device |
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|---|---|---|---|
| CNB021247676A CN1307369C (en) | 2002-06-24 | 2002-06-24 | Compressor frequency-converting control device |
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| CN1307369C true CN1307369C (en) | 2007-03-28 |
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| CN103516287B (en) * | 2012-06-19 | 2017-11-17 | 博世汽车柴油系统有限公司 | Computational methods and computing device |
| CN105953488A (en) * | 2016-03-25 | 2016-09-21 | 合肥天鹅制冷科技有限公司 | Control device for high speed motor refrigerating machine of air compression refrigeration system |
| CN106196786B (en) * | 2016-07-04 | 2019-05-31 | 青岛海尔空调器有限总公司 | The method for adjusting outdoor machine of air-conditioner electronic expansion valve |
| CN106196785B (en) * | 2016-07-04 | 2019-05-31 | 青岛海尔空调器有限总公司 | A method of control air conditioner electronic expansion valve |
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| CN1055584A (en) * | 1990-04-02 | 1991-10-23 | 北京市西城新开通用试验厂 | The compressor of numerically-controlled variable working condition |
| CN1163002A (en) * | 1994-11-08 | 1997-10-22 | 西门子公司 | Process for designing a fuzzy-controller |
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| CN1464196A (en) | 2003-12-31 |
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