CN103527461A - Operational control system of air compressor and operational control method of air compressor - Google Patents
Operational control system of air compressor and operational control method of air compressor Download PDFInfo
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- CN103527461A CN103527461A CN201210233069.XA CN201210233069A CN103527461A CN 103527461 A CN103527461 A CN 103527461A CN 201210233069 A CN201210233069 A CN 201210233069A CN 103527461 A CN103527461 A CN 103527461A
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Abstract
The invention provides an operational control system of an air compressor. The operational control system comprises a motor, a pressure sensor, an air inlet valve and a frequency converter, wherein the motor is used for supplying power to the air compressor; the pressure sensor is used for detecting the air supply pressure of the air compressor; the air inlet valve is used for controlling loading and unloading of the air compressor by controlling an air inlet of the air compressor; the frequency converter is provided with a first control port, a second control port and a feedback pressure input port, wherein the first control port is connected with the motor and used for controlling the motor to operate, the second control port is connected with the air inlet valve and used for controlling the air inlet valve, and the feedback pressure input port is connected with the pressure sensor and used for acquiring the air supply pressure. The invention further provides a corresponding operational control method of the air compressor based on the operational control system. The system and method are stable, reliable, simple and capable of increasing the energy saving rate.
Description
Technical field
The present invention relates to a kind of operation control system of air compressor, and relate to a kind of method of utilizing described operation control system to control air compressor operation.
Background technique
Air compressor is widely used in all conglomeraties such as industry, agricultural, building industry, is the main body in compressed air source unit, and it is the device that a kind of mechanical energy by prime mover (normally motor) converts gas pressure energy to.
Traditional air compressor method of operation, generally adopts star triangle decompression starting, total head or (power frequency) operation at full speed after starting.This mode inrush current is large, line voltage is impacted large, and at gas consumption, during few or no-load running, waste of energy is serious.
By adopting the motor of Frequency Converter Control air compressor to move, can effectively address the above problem.Particularly adopt the system of air compressor nonshared control unit and frequency variator simultaneously, to the control of loading and unloading time point, more flexibly with accurate, make the operation stability of air compressor and reliability higher.But, the air compressor of existing employing converter technology, at least more than one shortcoming below also existing:
1. adopt independent external PID regulator, increased equipment cost;
2. frequency variator is jumped protection at power supply grid when under-voltage or load overcurrent or load overload, causes air compressor hang-up;
3. air compressor nonshared control unit must be housed, this has limited the best applications of frequency variator on conventional air compressor;
4. air compressor nonshared control unit has the absolute control to air compressor, cannot bring into play the advantage of the various failure protection functions that frequency variator has.
Summary of the invention
The object of this invention is to provide a kind of a kind of operation control system and method for utilizing described operation control system to control air compressor operation that can overcome the air compressor of above-mentioned at least one shortcoming.
According to an aspect of the present invention, provide a kind of operation control system of air compressor, having comprised: motor, it is used to air compressor that power is provided; Pressure transducer, it is for detection of the supply gas pressure of air compressor; Suction valve, it is for controlling loading and the unloading of air compressor by controlling the suction port of air compressor; And frequency variator, its have be connected with motor for control motor operation the first control port, be connected with suction valve for control the second control port of suction valve and be connected with pressure transducer for obtaining the feedback pressure input port of supply gas pressure.
Preferably, described frequency variator has built-in PID regulator, and described PID regulator is controlled motor operation according to the supply gas pressure detecting, so that supply gas pressure reaches setting value.By built-in PID regulator, can to supply gas pressure, carry out constant voltage control easily.
Preferably, described operation control system also comprises for starting or stoping the start stop apparatus of the operation of frequency variator.By this start stop apparatus, can and stop controlling to the startup of frequency variator.
Preferably, described suction valve is arranged on the air inlet pipeline of the suction port that leads to air compressor.Like this, the control mode that provides a kind of air compressor to load and unload.
According to a further aspect in the invention, a kind of method of utilizing above-mentioned operation control system to control air compressor operation is provided, said method comprising the steps of: under suction valve cuts out state, when control the frequency variator of motor operation detect supply gas pressure lower than set threshold pression time, frequency variator is opened suction valve, and air compressor is loaded; And/or under INO state, when control the frequency variator of motor operation detect supply gas pressure higher than set upper limits pressure time, frequency variator cuts out suction valve, makes air compressor unloading.
Preferably, when under suction valve cuts out state, detect supply gas pressure lower than set threshold pression time, first make motor move to the loading frequency of setting, then lingeringly open suction valve, so that air compressor loads under described loading frequency.Described delay can guarantee that the rotating speed of motor reaches stable when opening suction valve.This loads frequency variator and motor under optimal operational condition, has both been beneficial to improve to load success rate, is beneficial to again raising fractional energy savings.
Preferably, frequency variator is controlled the motion speed of motor according to the supply gas pressure detecting by its built-in PID regulator, so that supply gas pressure reaches predetermined supply gas pressure.By built-in PID regulator, can to supply gas pressure, carry out constant voltage control easily.
Preferably, make motor carry at the band of INO the lower limit band carrier frequency rate that operation frequency under state is not less than setting.This can prevent that motor from damaging because of slow-speed of revolution run with load.
Preferably, when motor surpasses the scheduled time with described lower limit band carrier frequency rate operation, close suction valve, prevent motor long-time run with load under lower limit band carrier frequency rate.
Preferably, when following at least one fault detected under INO state: power supply grid is under-voltage, when frequency variator and/or over current of motor, frequency variator and/or motor overload, frequency variator cuts out suction valve, to motor, unloads.Like this, both reached motor and frequency variator had been implemented to the object of protecting, can reduce again the probability of air compressor hang-up.
Preferably, while frequency variator and/or motor overload fault being detected under INO state, first frequency reducing operation of frequency variator, reduces the motion speed of motor, if continue to transship, closes suction valve.This provides the mode of another reply frequency variator and/or motor overload fault, and this mode has reduced the frequency of air compressor unloading, has further improved fractional energy savings.
Preferably, after suction valve cuts out, move to motor time delay the sleep frequency (when sleep frequency equals zero, being equivalent to shutdown) of setting.Allow motor keep certain rotating speed to be conducive to when loading lifting motor rotating speed rapidly, reasonably sleep frequency can reach equinoctial point between fractional energy savings and loading velocity.Described time delay is used for guaranteeing that unloading completes smoothly.
Preferably, at the upper limits pressure of supply gas pressure and setting or threshold pression relatively time, by taking anti-erroneous judgement measure to prevent that the condition of instant error fluctuation of feedback pressure from causing erroneous judgement.This can prevent from loading continually and unloading because erroneous judgement makes air compressor.
Preferably, described anti-erroneous judgement measure is: at two or more isolated time points, detect supply gas pressure and average, then upper limits pressure or the threshold pression of this mean value and setting being compared to judgement; Or detect supply gas pressure at two or more isolated time points, only have the supply gas pressure that ought allly detect all higher than the upper limits pressure of setting or lower than the threshold pression of setting, just to make corresponding judgement.This provides a kind of anti-erroneous judgement measure simple, easy to implement.
According to the operation control system of air compressor of the present invention and method, by frequency variator, directly control compressor suction valve, realize the intelligent control of compressor suction valve and motor speed, can save air compressor nonshared control unit and independent external PID regulator, both improved the stability of a system, improved again fractional energy savings, also can reduce costs or system complexity.
Accompanying drawing explanation
Below, will the present invention be described in more detail referring to accompanying drawing, by this detailed description, those skilled in the art's feature and advantage that the present invention may be better understood.Accompanying drawing comprises:
Fig. 1 shows according to the operation control system of air compressor of the present invention exemplary embodiment; And
Fig. 2 shows according to the flow chart of the progress control method of air compressor of the present invention exemplary embodiment.
Embodiment
Below, will referring to Fig. 1, describe in detail according to the operation control system of air compressor of the present invention exemplary embodiment.
Air compressor 8 comprises motor 5, compressor 6, supply air line 9 and the gas holder 7 being connected with described supply air line 9, and compressed air is deposited in gas holder 7 through supply air line 9, and gas holder 7 is connected to gas equipment 11 by another supply air line 10 again.
As shown in Figure 1, according to the operation control system of the air compressor of an exemplary embodiment, comprise: frequency variator 1, start stop apparatus 2, pressure transducer 3, suction valve 4 and motor 5.Start stop apparatus 2 can be arranged on any correct position place of air compressor 8, and for starting or stoping the operation of frequency variator 1, its form of expression can be start-stop button, can be also frequency variator panel, or air compressor nonshared control unit panel.Pressure transducer 3 can be arranged on another supply air line 10 of air compressor 8 or be connected to as illustrated in fig. 1 gas holder 7, for the feedback pressure input port by frequency variator 1, to frequency variator 1, feed back in real time air feed air pressure, to provide foundation for control subsequently.For a person skilled in the art, as long as pressure transducer 3 can detect air compressor 8 to the supply gas pressure of gas equipment 11 air feed.Suction valve 4 is arranged on the suction port of compressor 6 conventionally, for controlling loading and the unloading of air compressor 8.Certainly, suction valve 4 also can be arranged in the air inlet pipeline of compressor 6.Motor 5 is used for controlling the aerogenesis speed of air compressor 8 as power source.According to the present invention, suction valve 4 and motor 5 are controlled by frequency variator 1 all.
Fig. 2 shows according to the flow chart of the progress control method of the operation control system based on shown in Fig. 1 of the present invention exemplary embodiment.
Conventionally, according to the application of air compressor 8, can be air compressor 8 and set a range of working pressure, air compressor 8 is moved in this range of working pressure.This range of working pressure is limited by upper and lower limit pressure.This upper and lower limit pressure can be set by frequency variator 1 by user.Under major applications occasion, need constant voltage to control air compressor 8, like this, just also need to set a predetermined pressure for air compressor 8, make the supply gas pressure of air compressor 8 under this predetermined pressure.In this case, also often need to set a certain range of working pressure that comprises this predetermined pressure for air compressor 8, when the supply gas pressure of air compressor 8 exceeds this range of working pressure, by described operation control system, intervene the operation of air compressor 8, to reach energy-conservation and to prevent the object that air compressor 8 damages.Concrete range of working pressure and predetermined pressure can be by user as the case may be such as the performance of air compressor itself, the settings such as demand of gas equipment.
As shown in Figure 2, under suction valve 4 closed conditions, when feedback pressure is less than given threshold pression, frequency variator 1 starting electrical machinery 5, make motor move to loading frequency (F2), then lingeringly open suction valve 4, to reach a certain rotating speed at motor 5, just make while reaching a certain loading frequency compressor 6 load, ensure that frequency variator 1 starts in underloading situation.Under loading frequency, load, object is to make frequency variator 1 and motor 5 bear load under good condition.Under suction valve 4 open modes, when feedback pressure is greater than given upper limits pressure, first by frequency variator 1, close suction valve 4,, first give compressor 6 unloadings, then after time delay after a while (T1), frequency variator 1 moves to sleep frequency (F1), makes motor 5 under light condition, keep slowly running or stopping operating.Under suction valve 4 open modes, when feedback pressure is not more than given upper limits pressure, be that air compressor 8 is when normal gas producing state, can based on feedback pressure, by frequency variator 1, control by pre-defined algorithm the motion speed of motor 5, and then supply gas pressure is carried out to regulation and control, for example according to the predetermined pressure between upper and lower limit pressure of setting, carry out constant pressure adjust, be about to supply gas pressure and regulate towards this predetermined pressure.
In engineering reality, the regulator control law being most widely used is ratio, integration, differential control, is called for short PID and controls, and claims again PID to regulate.PID controller is simple in structure with it, good stability, reliable operation, easy to adjust and become one of major technique of industrial control.When the structure and parameter of controlled device can not be grasped completely, or while can not get accurate mathematical model, when other technology of control theory is difficult to adopt, the structure and parameter of SC system controller must rely on experience and field adjustable to determine, at this moment thereof using PID control technique is the most convenient.
Therefore, for a person skilled in the art, when air compressor 8 is during in normal gas producing state, can adopt PID controlling method, based on predetermined pressure, supply gas pressure is carried out to constant pressure adjust and control.Conventional frequency variator inside is built-in with PID regulatory function conventionally at present, therefore, in the situation that needs carry out constant pressure adjust, can utilize the PID regulatory function of frequency variator inside to carry out constant pressure adjust.Like this, frequency variator 1 has been realized the intelligent control of the switch of suction valve 4 being controlled to (loading and Unloading Control) and motor 5 rotating speeds simultaneously, has both improved the stability of a system, has improved again energy-saving efficiency.
Certainly, within the scope of the invention, also can adopt other any suitable algorithms and controlling device to implement to control by 1 pair of motor of frequency variator 5, and then supply gas pressure is controlled.
When motor 5 bands carry (under suction valve 4 open modes) operation, in order to prevent that motor 5 from making load torque and motor radiating can not meet requirement crossing operation under low frequency, frequency variator 1 can be set a lower limit band carrier frequency rate, make motor 5 minimum under this lower limit band carrier frequency rate run with load, thereby prevent that motor from damaging during long-play under crossing low frequency.If desired, can also be when frequency variator surpasses the scheduled time with the operation of lower limit band carrier frequency rate, close suction valve, guarantee that motor run with load under lower limit band carrier frequency rate is no more than this scheduled time, further prevent motor 5 under lower limit band carrier frequency rate because long-play damages.
According to the above, the progress control method of air compressor of the present invention specifically comprises the following steps: for air compressor, set range of working pressure, described range of working pressure is limited by threshold pression and upper limits pressure; Frequency variator 1 is controlled motor 5 operations, under suction valve 4 closed conditions, when frequency variator 1 detects supply gas pressure lower than threshold pression, opens suction valve 4, and compressor 6 is loaded.Under suction valve 4 open modes, when supply gas pressure being detected higher than upper limits pressure, frequency variator 1 cuts out suction valve 4, makes compressor 6 unloadings.
As mentioned above, for air compressor, set loading frequency, when supply gas pressure being detected lower than threshold pression under suction valve 4 closed conditions, first make motor 5 move to described loading frequency, then lingeringly open suction valve 4, so that compressor 6 loads under described loading frequency.Described delay can guarantee that the rotating speed of motor 5 when opening suction valve 4 reaches stable, and this loads frequency variator and motor under optimal operational condition, has both been beneficial to improve to load success rate, is beneficial to again raising fractional energy savings.
Under suction valve 4 open modes when frequency variator detects following at least one fault: power supply grid is under-voltage, when frequency variator 1 and/or motor 5 overcurrents, frequency variator 1 and/or motor 5 overload, and frequency variator 1 cuts out suction valve 4, gives motor 5 and frequency variator 1 unloading.So both reached motor 5 and frequency variator 1 had been implemented to the object of protecting, can reduce again the probability of air compressor hang-up.
Preferably, under suction valve 4 open modes, when frequency variator detects frequency variator and/or motor overload fault, frequency variator 1 can also move in frequency reducing, reduces the running speed of motor 5, if continue overload, just closes suction valve 4.This provides the mode of another reply frequency variator 1 and/or motor 5 overload fault, and this mode has reduced the frequency of air compressor unloading, has further improved fractional energy savings.
For air compressor is set a sleep frequency, after suction valve 4 cuts out, move to motor 5 time delays this sleep frequency (when sleep frequency equals zero, being equivalent to shutdown).Allow motor keep certain rotating speed to be conducive to when loading the rotating speed of lifting motor 5 rapidly, reasonably sleep frequency can reach equinoctial point between fractional energy savings and loading velocity.Described time delay is used for guaranteeing that unloading completes smoothly.
In order further to improve the ride quality of air compressor, the condition of instant error fluctuation that prevents feedback pressure causes erroneous judgement and frequency variator is controlled suction valve continually, can adopt the method repeatedly comparing, the method for example comparing for twice, , when judging feedback pressure lower than threshold pression or higher than upper limits pressure, first not according to entering like that immediately loading procedure or uninstall process shown in Fig. 2, but after after a while, judgement once again, if judged result does not change, enter immediately loading procedure or uninstall process, if judged result changes, then certain interval of time judges next time again, the like.Certainly, also can adopt other any suitable determination methods, for example, the mean value of the feedback pressure in certain a period of time and upper limits pressure and threshold pression can be compared.
For a person skilled in the art, frequency variator of the present invention, general reference adopts the motor control assembly of converter technique.
According to the operation control system of air compressor of the present invention and progress control method, frequency variator is simultaneously as motor speed controlling component and suction valve controlling component, thereby can make frequency variator work in the best condition, greatly reduce the rate of breakdown such as overcurrent or overload.That is to say, according to the operation control system of air compressor of the present invention and progress control method, by frequency variator, directly control compressor suction valve, realized the intelligent control of compressor suction valve and motor speed, can save air compressor nonshared control unit and independent external PID regulator, both improve the stability of a system, improve again energy-saving efficiency, also can reduce costs or system complexity, guarantee that motor moves in normal frequency range simultaneously.
Claims (11)
1. an operation control system for air compressor, comprising:
Motor, it is used to air compressor that power is provided;
Pressure transducer, it is for detection of the supply gas pressure of air compressor;
Suction valve, it is for controlling loading and the unloading of air compressor by controlling the suction port of air compressor; And
Frequency variator, its have be connected with motor for control motor operation the first control port, be connected with suction valve for control the second control port of suction valve and be connected with pressure transducer for obtaining the feedback pressure input port of supply gas pressure.
2. operation control system as claimed in claim 1, is characterized in that,
Described frequency variator has built-in PID regulator, and described PID regulator is controlled motor operation according to the supply gas pressure detecting, so that supply gas pressure reaches setting value; And/or
Described operation control system also comprises for starting or stoping the start stop apparatus of the operation of frequency variator.
3. operation control system as claimed in claim 1 or 2, is characterized in that,
Described suction valve is arranged on the air inlet pipeline of the suction port that leads to air compressor.
4. utilize operation control system described in claim 1 to control a method for air compressor operation, said method comprising the steps of:
Under suction valve cuts out state, when control the frequency variator of motor operation detect supply gas pressure lower than set threshold pression time, frequency variator is opened suction valve, and air compressor is loaded; And/or
Under INO state, when control the frequency variator of motor operation detect supply gas pressure higher than set upper limits pressure time, frequency variator cuts out suction valve, makes air compressor unloading.
5. method as claimed in claim 4, is characterized in that, described method is further comprising the steps of:
When under suction valve cuts out state, detect supply gas pressure lower than set threshold pression time, first make motor move to the loading frequency of setting, then lingeringly open suction valve, so that air compressor loads under described loading frequency; And/or
Frequency variator is controlled the motion speed of motor according to the supply gas pressure detecting by its built-in PID regulator, so that supply gas pressure reaches predetermined supply gas pressure.
6. the method as described in claim 4 or 5, is characterized in that, described method is further comprising the steps of:
Make motor carry at the band of INO the lower limit band carrier frequency rate that operation frequency under state is not less than setting.
7. method as claimed in claim 6, is characterized in that,
When motor surpasses the scheduled time with described lower limit band carrier frequency rate operation, close suction valve, prevent motor long-time run with load under lower limit band carrier frequency rate.
8. as the method as described in arbitrary in claim 5-7, it is characterized in that, described method is further comprising the steps of:
When following at least one fault detected under INO state: power supply grid is under-voltage, when frequency variator and/or over current of motor, frequency variator and/or motor overload, frequency variator cuts out suction valve, to motor, unloads; And/or
While frequency variator and/or motor overload fault being detected under INO state, first frequency reducing operation of frequency variator, reduces the motion speed of motor, if continue to transship, closes suction valve.
9. as the method as described in arbitrary in claim 5-8, it is characterized in that, described method is further comprising the steps of:
After suction valve cuts out, move to motor time delay the sleep frequency of setting.
10. as the method as described in arbitrary in claim 5-9, it is characterized in that, described method is further comprising the steps of:
At the upper limits pressure of supply gas pressure and setting or threshold pression relatively time, by taking anti-erroneous judgement measure to prevent that the condition of instant error fluctuation of feedback pressure from causing erroneous judgement.
11. methods as claimed in claim 10, is characterized in that,
Described anti-erroneous judgement measure is:
At two or more isolated time points, detect supply gas pressure and average, then upper limits pressure or the threshold pression of this mean value and setting being compared to judgement; Or
At two or more isolated time points, detect supply gas pressure, only have the supply gas pressure that ought allly detect all higher than the upper limits pressure of setting or lower than the threshold pression of setting, just to make corresponding judgement.
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| CN104967301A (en) * | 2015-05-29 | 2015-10-07 | 广东美的制冷设备有限公司 | Apparatus and method of protecting sudden voltage rise of PFC circuit in frequency-conversion household equipment |
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| CN107013443A (en) * | 2016-01-28 | 2017-08-04 | Abb技术有限公司 | Load/unload control method and equipment for compressor assembly |
| CN110735781A (en) * | 2019-11-11 | 2020-01-31 | 宁夏实德新型建材有限公司 | Control system and method for air compressor components |
| CN111308344A (en) * | 2020-03-18 | 2020-06-19 | 珠海格力电器股份有限公司 | Electrical appliance, motor fault identification method and device thereof and storage medium |
| CN114352533A (en) * | 2022-01-24 | 2022-04-15 | 南通市红星空压机配件制造有限公司 | Control method for electric air inlet valve of movable air compressor |
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| CN110735781B (en) * | 2019-11-11 | 2021-08-31 | 宁夏实德新型建材有限公司 | Control system and method for air compressor assembly |
| CN111308344A (en) * | 2020-03-18 | 2020-06-19 | 珠海格力电器股份有限公司 | Electrical appliance, motor fault identification method and device thereof and storage medium |
| CN114352533A (en) * | 2022-01-24 | 2022-04-15 | 南通市红星空压机配件制造有限公司 | Control method for electric air inlet valve of movable air compressor |
| CN114352533B (en) * | 2022-01-24 | 2023-11-21 | 南通市红星空压机配件制造有限公司 | Control method for electric air inlet valve of mobile air compressor |
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Application publication date: 20140122 |