CN104564633B - The control system of a kind of air compressor and control method thereof - Google Patents
The control system of a kind of air compressor and control method thereof Download PDFInfo
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Abstract
The present invention is control system and the control method thereof of a kind of air compressor, and this control system includes air compressor, air cushioning tank, pressure transducer, data processing unit and control unit；Pressure transducer is arranged on inside air cushioning tank, the signal output part of pressure transducer is connected with the signal input part of data processing unit, the signal output part of data processing unit is connected with the signal input part of control unit, and the signal output part of control unit is connected with air compressor；This control method is to utilize pressure transducer detection air cushioning pressure tank, is obtained variation tendency and the size of air pressure value by data processing means, controls air compressor start and stop during according to the fructufy of data process；The present invention is no longer necessary to judge that air pressure is in ascent stage or decline stage, only need to compare with default value；Except realizing that the automatic steady of pressure is controlled, more greatly simplify control program, decrease the workload of program maintenance.
Description
Technical field
The present invention relates to a kind of automatic control system in chemical field, particularly relate to control system and the control method thereof of a kind of air compressor.
Background technology
In in chemical field, it is often necessary to use air compressor to manufacture the air producing certain pressure, purge as instrument wind, pipeline, lower the temperature, participate in the occasions such as chemical reaction needs.
Air compressor is typically utilized to manufacture the flow process producing certain pressure air as it is shown in figure 1, Fig. 1 is one；In most cases, factory all can choose two same air compressors, adopt the mode of the using and the reserved, i.e. general unlatching air compressor 1, when system detects that air compressor 1 breaks down, automatically start air compressor 2, to guarantee the normal operation of air supply system.
In the production process of pressure air, it is different for air cushioning pressure tank uphill process and pressure decline process to the control of air compressor.Conventional control method is to adopt sequential control, but adopts sequential control to have a maximum difficult point is how to judge that the pressure of air cushioning tank is in ascent stage or decline stage.Assume the force value acquiring now an air cushioning tank, the current pressure values of air cushioning tank is again gathered after the time of certain intervals, before and after relatively, the force value size of twice collection may determine that air pressure is in ascent stage or decline stage, but the shortcoming of this method is apparent from:
1) this comparison program section needs ceaselessly to circulate, and significantly increases the load of controller；
2) once pressure transmitter breaks down, it is possible to the judgement controlling system mistake can be caused, thus performing the action of mistake.
Summary of the invention
The present invention solves that existing air compressor automatic control system cannot accurately identify the variation tendency of air pressure and the defect that cost performance is relatively low, it is provided that the control system of a kind of air compressor and control method thereof.
Technical scheme is as follows:
First protection theme of the present invention is: the control system of a kind of air compressor.
Described control system includes air compressor 1, air cushioning tank 2, pressure transducer 3, data processing unit, control unit and signal output unit；
Described pressure transducer 3 is arranged on described air cushioning tank 2 top, described data processing unit, control unit and signal output unit are sequentially connected with, and the described signal input part of data processing unit is connected with the signal output part of described pressure transducer 3, the outfan of described signal output unit controls end with the signal of described air compressor 1 and is connected；
Described data processing unit include be more than or equal to logic function block, first less than or equal to logic function block and second less than or equal to logic function block；Described electrically connect with the signal output part of described pressure transducer 3 and pressure ceiling value signal respectively be more than or equal to the first input end of logic function block and the second input, described first electrically connects with the signal output part of described pressure transducer 3 and pressure low limit value signal respectively less than or equal to the first input end of logic function block and the second input, and described second electrically connects with the low restriction signal of the signal output part of described pressure transducer 3 and pressure respectively less than or equal to the first input end of logic function block and the second input；
Described control unit includes rest-set flip-flop and or logic function block；The R input of described rest-set flip-flop and S input electrically connect less than or equal to the outfan of logic function block be more than or equal to the outfan of logic function block and described first with described respectively, described or logic function block two inputs are connected less than or equal to the outfan of logic function block with the Q output of described rest-set flip-flop and described second respectively, and described or logic function block outfan is connected with described signal output unit；
Air pressure signal in described air cushioning tank 2 is transmitted to described data processing unit by described pressure transducer 3, the size of described air pressure signal is judged by described data processing unit, and by data processed result transmission to described control unit, the control signal that current air pressure signal is corresponding is obtained by described control unit, and send on off control signal by described signal output unit to described air compressor 1, it is achieved the automation control system of described air compressor 1 start and stop is controlled in real time by air pressure signal.
Described pressure ceiling value signal is higher than described pressure low limit value signal, and described pressure low limit value signal is higher than the low restriction signal of described pressure.
The quantity of described air compressor 1 is a pair, and it is the first air compressor and the second air compressor respectively, and described first compressor and the second compressor are arranged on the outfan of described signal output unit, the using and the reserved parallel；
Described signal output unit includes two-way, and it respectively enables the signal output unit of the first air compressor and enables the signal output unit of the second air compressor, and described in two-way, signal output unit is arranged parallel；
Signal output unit described in every road include respectively first with logic function block, second with logic function block, NOT logic functional device, enable the first air compressor select switch and enable the second air compressor selection switch；Described first is connected with described or logic function block outfan and one of them described selection switch respectively with a pair input of logic function block, the input of described NOT logic functional device is connected with selection switch another described, described second is connected with the outfan of logic function block and the outfan of NOT logic functional device with described first respectively with a pair input of logic function block, and described second controls end with the outfan of logic function block with the signal of air compressor one of them described 1 is connected；
Switch is selected to control the start and stop of air compressor 1 described in a pair respectively by described.
Be more than or equal to logic module, i.e. GE logic module, including two inputs and an outfan, input is IN1 and IN2 respectively, and outfan is OUT；When IN1 is be more than or equal to IN2, output OUT value is 1, is otherwise 0.
Less than or equal to logic module, i.e. LE logic module, it includes two inputs and an outfan, and input is IN1 and IN2 respectively, and outfan is OUT；When IN1 is less than or equal to IN2, output OUT value is 1, is otherwise 0.
Or logic module, i.e. OR logic module, it includes two inputs and an outfan, and input is IN1 and IN2 respectively, and outfan is OUT；When IN1 or IN2 is 1, output OUT value is 1, is otherwise 0.
With logic module, i.e. AND logic module, it includes two inputs and an outfan, and input is IN1 and IN2 respectively, and outfan is OUT；When IN1 and IN2 is 1, output OUT value is 1, is otherwise 0.
In being embodied as, data processing unit and control unit adopt DCS control module.
Second protection theme of the present invention is: utilize the method that this control system controls air compressor start and stop.
Described method is the air pressure utilizing described pressure transducer 3 to detect in real time in described air cushioning tank 2, the magnitude relationship of air pressure value and node pressure value is obtained again through data processing means, and the start and stop controlling described air compressor 1 are adjusted in real time according to this magnitude relationship, it is achieved the automatic control process to described air compressor 1；
Concretely comprising the following steps of described control method:
Step 1, builds described control system, itself particularly as follows:
Described pressure transducer 3 is arranged on described air cushioning tank 2 top, described data processing unit, control unit and signal output unit are sequentially connected with, and the described signal input part of data processing unit is connected with the signal output part of described pressure transducer 3, the outfan of described signal output unit controls end with the signal of described air compressor 1 and is connected；
Step 2, preset parameter value；
Described data processing unit arranges parameter value, including the low limit value of the initial pressure value in described air cushioning tank 2, pressure ceiling value, pressure low limit value and pressure；Initial pressure value in described air cushioning tank 2 is 0 or normal pressure, and the low limit value of described pressure ceiling value, pressure low limit value, pressure is above the initial pressure value in described air cushioning tank 2；
Step 3, data detecting step；
Open described air compressor 1, described air cushioning pipe 2 is pressurizeed, utilize described pressure transducer 3 to obtain the air pressure signal in described air cushioning tank 2 in real time simultaneously, and by described air pressure signal transmission to described data processing unit；Judge scope residing for air pressure signal by described data processing unit, and determine the duty of described air compressor 1 according to data processed result；
Step 4, described air compressor 1 is in data processing step during opening, and its detailed process is:
Step 4-1, contrasts the size of described air pressure signal and the low limit value of described pressure；
If described air pressure signal is lower than the low limit value of described pressure, then described rest-set flip-flop output high level, described or logic function block exports high level, makes described air compressor 1 be held open state by described control unit, and repeats the operation of described step 4-1；
If described air pressure signal is higher than the low limit value of described pressure, then order performs the operation of step 4-2；
Step 4-2, contrasts the size of described air pressure signal and described pressure low limit value；
If described air pressure signal is lower than described pressure low limit value, then described rest-set flip-flop output high level, described or logic function block exports high level, makes described air compressor (1) be held open state by described control unit, and repeats the operation of described step 4-2；
If described air pressure signal is higher than described pressure low limit value, then order performs the operation of step 4-3；
Step 4-3, contrasts the size of described air pressure signal and described pressure ceiling value；
If described air pressure signal is lower than described pressure ceiling value, the high level that then output of described rest-set flip-flop is identical with described step 4-2, described or logic function block exports high level, make described air compressor 1 be held open state by described control unit, and repeat the operation of described step 4-3；
If described air pressure signal is higher than described pressure ceiling value, then described rest-set flip-flop output low level, described or logic function block output low level, make described air compressor 1 out of service by described control unit；
Step 5, described air compressor 1 is in data processing step during halted state, itself particularly as follows:
Step 5-1, contrasts the size of described air pressure signal and described pressure ceiling value；
If described air pressure signal is higher than described pressure ceiling value, then described rest-set flip-flop output low level, described or logic function block output low level, makes described air compressor 1 keep halted state by described control unit, and repeats the operation of described step 5-1；
If described air pressure signal is lower than described pressure ceiling value, then order performs the operating procedure of step 5-2；
Step 5-2, contrasts the size of described air pressure signal and described pressure low limit value；
If described air pressure signal is higher than described pressure low limit value, the low level that then output of described rest-set flip-flop is identical with described step 5-1, described or logic function block output low level, make described air compressor 1 keep halted state by described control unit, and repeat the operation of described step 5-2；
If described air pressure signal is lower than described pressure low limit value, then order performs the operation of step 5-3；
Step 5-3, contrasts the size of described air pressure signal and the low limit value of described pressure；
If described air pressure signal is higher than the low limit value of described pressure, then described rest-set flip-flop output high level, described or logic function block output high level, open described air compressor 1 by described control unit, and repeat the operation of described step 5-3；
If described air pressure signal is lower than the low limit value of described pressure, then described rest-set flip-flop output high level, described or logic function block exports high level, makes described air compressor 1 be held open state by described control unit, and repeats the operation of described step 5-3；
Step 6, repeats the operation to step 5 of the described step 4, adjusts the duty of described air compressor 1 in real time according to the change of air pressure signal.
The control program of this method is the same with the actual startup procedure of chemical production device, being namely 0 or normal pressure from the pressure of air cushioning tank 1, because generally before device is driven, not having pressure in air cushioning tank 1.This method is from the control program described in this patent that comes into operation driving, rather than in use comes into operation, and is so consistent with practical operation situation.
In step 4, air pressure signal is in ascent stage all the time, and in step 5, air pressure signal is in the decline stage all the time, and the processing method of the two is different, particularly as follows:
In step 4:
1., when air pressure signal is less than or equal to the pressure low limit value set, air compressor 1 is started；
2. air pressure signal more than low limit value less than or equal to low limit value time, continue start air compressor 1；
3., when air pressure signal is more than low limit value and less than ceiling value, continue to start air compressor 1；
4., when air pressure signal is more than or equal to ceiling value, air compressor 1 quits work；
In step 5:
5. along with the consumption of air capacity, when air pressure signal is more than low limit value and less than ceiling value, air compressor 1 continues to quit work；
6., along with the continuation consumption of air capacity, when air pressure signal is less than or equal to low limit value and more than low limit value, air compressor 1 is started；
If after 7. air compressor 1 starts, when making air pressure signal less than low limit value due to the continuation consumption of air capacity, then continue to start air compressor 1；
The method have the characteristics that and have employed rest-set flip-flop, rest-set flip-flop includes the input of two NAND gate and outfan interconnection forms, it includes two inputs and an outfan, respectively R input, S input and Q output, and the two input is called again triggering signal end.
The truth table of rest-set flip-flop is as shown in table 1:
Table 1
| S input | R input | Q output |
| 0 | 0 | NO CHANGE |
| 0 | 1 | 0 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
After using rest-set flip-flop, it is no longer necessary to judge that air pressure is in ascent stage or decline stage, only need to by the comparison with default value；Well achieve the control to air compressor, avoid the hidden danger using complicated sequential control and bring simultaneously；Compared with traditional control mode, except realizing that the automatic steady of pressure is controlled, more greatly simplify control program, decrease the workload of program maintenance.
Accompanying drawing explanation
Fig. 1 is the workflow diagram utilizing air compressor；
Fig. 2 is the Control system architecture schematic diagram of a kind of air compressor of the present invention；
Fig. 3 is the circuit flow chart of the data processing unit of the present invention and control unit；
Fig. 4 is the process chart of the control method of the present invention；
Drawing reference numeral illustrates:
1-air compressor；2-air cushioning tank；3-pressure transducer；
Below in conjunction with the drawings and specific embodiments, the present invention being described in more detail, protection scope of the present invention is not limited to following detailed description of the invention.
Detailed description of the invention
As shown in Figure 2 and Figure 3, the control system of a kind of air compressor, including air compressor 1, air cushioning tank 2, pressure transducer 3, data processing unit, control unit and signal output unit；
Described pressure transducer 3 is arranged on described air cushioning tank 2 top, described data processing unit, control unit and signal output unit are sequentially connected with, and the described signal input part of data processing unit is connected with the signal output part of described pressure transducer 3, the outfan of described signal output unit controls end with the signal of described air compressor 1 and is connected；
Described data processing unit include be more than or equal to logic function block, first less than or equal to logic function block and second less than or equal to logic function block；Described electrically connect with the signal output part of described pressure transducer 3 and pressure ceiling value signal respectively be more than or equal to the first input end of logic function block and the second input, described first electrically connects with the signal output part of described pressure transducer 3 and pressure low limit value signal respectively less than or equal to the first input end of logic function block and the second input, and described second electrically connects with the low restriction signal of the signal output part of described pressure transducer 3 and pressure respectively less than or equal to the first input end of logic function block and the second input；
Described control unit includes rest-set flip-flop and or logic function block；The R input of described rest-set flip-flop and S input electrically connect less than or equal to the outfan of logic function block be more than or equal to the outfan of logic function block and described first with described respectively, described or logic function block two inputs are connected less than or equal to the outfan of logic function block with the Q output of described rest-set flip-flop and described second respectively, and described or logic function block outfan is connected with described signal output unit；
Air pressure signal in described air cushioning tank 2 is transmitted to described data processing unit by described pressure transducer 3, the size of described air pressure signal is judged by described data processing unit, and by data processed result transmission to described control unit, the control signal that current air pressure signal is corresponding is obtained by described control unit, and send on off control signal by described signal output unit to described air compressor 1, it is achieved the automation control system of described air compressor 1 start and stop is controlled in real time by air pressure signal.
Described pressure ceiling value signal is 4Mpa, and described pressure low limit value signal is 1.5Mpa, and the low limit value of described pressure is 1.2Mpa.
The quantity of described air compressor 1 is a pair, and it is the first air compressor and the second air compressor respectively, and described first compressor and the second compressor are arranged on the outfan of described signal output unit, the using and the reserved parallel；
Described signal output unit includes two-way, and it respectively enables the signal output unit of the first air compressor and enables the signal output unit of the second air compressor, and described in two-way, signal output unit is arranged parallel；
Signal output unit described in every road include respectively first with logic function block, second with logic function block, NOT logic functional device, enable the first air compressor select switch and enable the second air compressor selection switch；Described first is connected with described or logic function block outfan and one of them described selection switch respectively with a pair input of logic function block, the input of described NOT logic functional device is connected with selection switch another described, described second is connected with the outfan of logic function block and the outfan of NOT logic functional device with described first respectively with a pair input of logic function block, and described second controls end with the outfan of logic function block with the signal of air compressor one of them described 1 is connected；
Switch is selected to control the start and stop of air compressor 1 described in a pair respectively by described.
As shown in Figure 4, utilize the method that this control system controls air compressor start and stop, this method is the air pressure utilizing described pressure transducer 3 to detect in real time in described air cushioning tank 2, the magnitude relationship of air pressure value and node pressure value is obtained again through data processing means, and the start and stop controlling described air compressor 1 are adjusted in real time according to this magnitude relationship, it is achieved the automatic control process to described air compressor 1；
Concretely comprising the following steps of described control method:
Step 1, builds described control system, itself particularly as follows:
Described pressure transducer 3 is arranged on described air cushioning tank 2 top, described data processing unit, control unit and signal output unit are sequentially connected with, and the described signal input part of data processing unit is connected with the signal output part of described pressure transducer 3, the outfan of described signal output unit controls end with the signal of described air compressor 1 and is connected；
Step 2, preset parameter value；
Described data processing unit arranges parameter value, including the low limit value of the initial pressure value in described air cushioning tank 2, pressure ceiling value, pressure low limit value and pressure；Wherein, pressure ceiling value to be 4MPa, pressure low limit value be 1.5MPa, the low limit value of pressure are 1.2MPa.
Initial pressure value in described air cushioning tank 2 is 0 or normal pressure, and the low limit value of described pressure ceiling value, pressure low limit value, pressure is above the initial pressure value in described air cushioning tank 2；
Defined variable:
PI01_PV is the air pressure signal value of detection in real time, PI01_LL is the low limit value of air pressure, PI01_L is the low limit value of air pressure, PI01_H is the ceiling value of air pressure, AIR1_S is the switch of the first air compressor, AIR1_SEL is the Path selection switch enabling the first air compressor, and AIR2_S is the switch of the second air compressor, and AIR2_SEL is the Path selection switch enabling the second air compressor；
Step 3, data detecting step；
Open described air compressor 1, described air cushioning pipe 2 is pressurizeed, utilize described pressure transducer 3 to obtain the air pressure signal PI01_PV in described air cushioning tank 2 in real time simultaneously, and by described air pressure signal PI01_PV transmission to described data processing unit；Judge scope residing for air pressure signal PI01_PV by described data processing unit, and determine the duty of described air compressor 1 according to data processed result；
Step 4, described air compressor 1 is in data processing step during opening, and its detailed process is:
Step 4-1, contrasts the size of described air pressure signal PI01_PV and the low limit value PI01_LL of described pressure；
If described air pressure signal PI01_PV is lower than the low limit value PI01_LL of described pressure, then described rest-set flip-flop output high level, described or logic function block exports high level, described air compressor 1 is made to be held open state by described control unit, i.e. AIR1_S=1, and repeat the operation of described step 4-1；
If described air pressure signal PI01_PV is higher than the low limit value PI01_LL of described pressure, then order performs the operation of step 4-2；
Step 4-2, contrasts the size of described air pressure signal PI01_PV and described pressure low limit value PI01_L；
If described air pressure signal PI01_PV is lower than described pressure low limit value PI01_L, then described rest-set flip-flop output high level, described or logic function block exports high level, described air compressor (1) is made to be held open state by described control unit, i.e. AIR1_S=1, and repeat the operation of described step 4-2；
If described air pressure signal PI01_PV is higher than described pressure low limit value PI01_L, then order performs the operation of step 4-3；
Step 4-3, contrasts the size of described air pressure signal PI01_PV and described pressure ceiling value PI01_H；
If described air pressure signal PI01_PV is lower than described pressure ceiling value PI01_H, the high level that then output of described rest-set flip-flop is identical with described step 4-2, described or logic function block exports high level, described air compressor 1 is made to be held open state by described control unit, i.e. AIR1_S=1, and repeat the operation of described step 4-3；
If described air pressure signal PI01_PV is higher than described pressure ceiling value PI01_H, then described rest-set flip-flop output low level, described or logic function block output low level, make described air compressor 1 out of service by described control unit, i.e. AIR1_S=0；
In step 4, the duty of air compressor 1 is as shown in table 2:
Table 2
| When air cushioning pressure tank rises | AIR1_S | AIR2_S |
| PI01_PV≤PI01_LL | 1 | 1 |
| PI01_LL<PI01_PV≤PI01_L | 1 | 1 |
| PI01_L<PI01_PV<PI01_H | 1 | 1 |
| PI01_PV≥PI01_H | 0 | 0 |
Step 5, described air compressor 1 is in data processing step during halted state, itself particularly as follows:
Step 5-1, contrasts the size of described air pressure signal PI01_PV and described pressure ceiling value PI01_H；
If described air pressure signal PI01_PV is higher than described pressure ceiling value PI01_H, then described rest-set flip-flop output low level, described or logic function block output low level, described air compressor 1 is made to keep halted state by described control unit, i.e. AIR1_S=0, and repeat the operation of described step 5-1；
If described air pressure signal PI01_PV is lower than described pressure ceiling value PI01_H, then order performs the operating procedure of step 5-2；
Step 5-2, contrasts the size of described air pressure signal PI01_PV and described pressure low limit value PI01_L；
If described air pressure signal PI01_PV is higher than described pressure low limit value PI01_L, the low level that then output of described rest-set flip-flop is identical with described step 5-1, described or logic function block output low level, described air compressor 1 is made to keep halted state by described control unit, i.e. AIR1_S=0, and repeat the operation of described step 5-2；
If described air pressure signal PI01_PV is lower than described pressure low limit value PI01_L, then order performs the operation of step 5-3；
Step 5-3, contrasts the size of described air pressure signal PI01_PV and the low limit value PI01_LL of described pressure；
If described air pressure signal PI01_PV is higher than the low limit value PI01_LL of described pressure, then described rest-set flip-flop output high level, described or logic function block exports high level, described air compressor 1 is opened by described control unit, i.e. AIR1_S=1, and repeat the operation of described step 5-3；
If described air pressure signal PI01_PV is lower than the low limit value PI01_LL of described pressure, then described rest-set flip-flop output high level, described or logic function block exports high level, described air compressor 1 is made to be held open state by described control unit, i.e. AIR1_S=1, and repeat the operation of described step 5-3；
In step 5, the duty of air compressor 1 is as shown in table 3:
Table 3
| When gas surge tank pressure declines | AIR1_S | AIR2_S |
| PI01_PV≥PI01_H | 0 | 0 |
| PI01_L<PI01_PV<PI01_H | 0 | 0 |
| PI01_LL<PI01_PV≤PI01_L | 1 | 1 |
| PI01_PV≤PI01_LL | 1 | 1 |
Step 6, repeats the operation to step 5 of the described step 4, adjusts the duty of described air compressor 1 in real time according to the change of air pressure signal；The duty of air compressor 1 is as shown in table 2:
Technique scheme is one embodiment of the present invention, for those skilled in the art, the invention discloses on the basis of application process and principle, it is easy to make various types of improvement or deformation, it is not limited solely to the structure described by the above-mentioned detailed description of the invention of the present invention, therefore previously described mode is simply preferably, and does not have restrictive meaning.
Claims (4)
1. the control system of an air compressor, it is characterised in that:
Described control system includes air compressor (1), air cushioning tank (2), pressure transducer (3), data processing unit, control unit and signal output unit；
Described pressure transducer (3) is arranged on described air cushioning tank (2) top, described data processing unit, control unit and signal output unit are sequentially connected with, and the described signal input part of data processing unit is connected with the signal output part of described pressure transducer (3), the outfan of described signal output unit controls end with the signal of described air compressor (1) and is connected；
Described data processing unit include be more than or equal to logic function block, first less than or equal to logic function block and second less than or equal to logic function block；Described electrically connect with the signal output part of described pressure transducer (3) and pressure ceiling value signal respectively be more than or equal to the first input end of logic function block and the second input, described first electrically connects with the signal output part of described pressure transducer (3) and pressure low limit value signal respectively less than or equal to the first input end of logic function block and the second input, and described second electrically connects with the low restriction signal of the signal output part of described pressure transducer (3) and pressure respectively less than or equal to the first input end of logic function block and the second input；
Described control unit includes rest-set flip-flop and or logic function block；The R input of described rest-set flip-flop and S input electrically connect less than or equal to the outfan of logic function block be more than or equal to the outfan of logic function block and described first with described respectively, described or logic function block two inputs are connected less than or equal to the outfan of logic function block with the Q output of described rest-set flip-flop and described second respectively, and described or logic function block outfan is connected with described signal output unit；
Air pressure signal in described air cushioning tank (2) is by described pressure transducer (3) transmission to described data processing unit, the size of described air pressure signal is judged by described data processing unit, and by data processed result transmission to described control unit, the control signal that current air pressure signal is corresponding is obtained by described control unit, and send on off control signal by described signal output unit to described air compressor (1), realize being controlled in real time the automation control system of described air compressor (1) start and stop by air pressure signal.
2. the control system of a kind of air compressor according to claim 1, it is characterised in that:
Described pressure ceiling value signal is higher than described pressure low limit value signal, and described pressure low limit value signal is higher than the low restriction signal of described pressure.
3. the control system of a kind of air compressor according to claim 1, it is characterised in that:
The quantity of described air compressor (1) is a pair, and it is the first air compressor and the second air compressor respectively, and described first compressor and the second compressor are arranged on the outfan of described signal output unit parallel；
Described signal output unit includes two-way, and it respectively enables the signal output unit of the first air compressor and enables the signal output unit of the second air compressor, and described in two-way, signal output unit is arranged parallel；
Signal output unit described in every road include respectively first with logic function block, second with logic function block, NOT logic functional device, enable the first air compressor select switch and enable the second air compressor selection switch；Described first is connected with described or logic function block outfan and one of them described selection switch respectively with a pair input of logic function block, the input of described NOT logic functional device is connected with selection switch another described, described second is connected with the outfan of logic function block and the outfan of NOT logic functional device with described first respectively with a pair input of logic function block, and described second controls end with the outfan of logic function block with the signal of air compressor one of them described (1) is connected；
Switch is selected to control the start and stop of air compressor (1) described in a pair respectively by described.
4. utilize the method that the control system of one of claim 1～3 controls air compressor start and stop, it is characterised in that:
Described method is the air pressure utilizing described pressure transducer (3) to detect in described air cushioning tank (2), the magnitude relationship of air pressure value and node pressure value is obtained again through data processing means, and the start and stop controlling described air compressor (1) are adjusted in real time according to this magnitude relationship, it is achieved the automatic control process to described air compressor (1)；
Concretely comprising the following steps of described control method:
Step 1, builds described control system, itself particularly as follows:
Described pressure transducer (3) is arranged on described air cushioning tank (2) top, described data processing unit, control unit and signal output unit are sequentially connected with, and the described signal input part of data processing unit is connected with the signal output part of described pressure transducer (3), the outfan of described signal output unit controls end with the signal of described air compressor (1) and is connected；
Step 2, preset parameter value；
Described data processing unit arranges parameter value, including the initial pressure value in described air cushioning tank (2), pressure ceiling value, pressure low limit value and the low limit value of pressure；
Initial pressure value in described air cushioning tank (2) is 0 or normal pressure, and the low limit value of described pressure ceiling value, pressure low limit value, pressure is above the initial pressure value in described air cushioning tank (2)；
Step 3, data detecting step；
Open described air compressor (1), described air cushioning tank (2) is pressurizeed, utilize described pressure transducer (3) to obtain the air pressure signal in described air cushioning tank (2) in real time simultaneously, and by described air pressure signal transmission to described data processing unit；Judge scope residing for air pressure signal by described data processing unit, and determine the duty of described air compressor (1) according to data processed result；
Step 4, described air compressor (1) is in data processing step during opening, and its detailed process is:
Step 4-1, contrasts the size of described air pressure signal and the low limit value of described pressure；
If described air pressure signal is lower than the low limit value of described pressure, then described rest-set flip-flop output high level, described or logic function block exports high level, makes described air compressor (1) be held open state by control unit, and repeats the operation of described step 4-1；
If described air pressure signal is higher than the low limit value of described pressure, then order performs the operation of step 4-2；
Step 4-2, contrasts the size of described air pressure signal and described pressure low limit value；
If described air pressure signal is lower than described pressure low limit value, then described rest-set flip-flop output high level, described or logic function block exports high level, makes described air compressor (1) be held open state by described control unit, and repeats the operation of described step 4-2；
If described air pressure signal is higher than described pressure low limit value, then order performs the operation of step 4-3；
Step 4-3, contrasts the size of described air pressure signal and described pressure ceiling value；
If described air pressure signal is lower than described pressure ceiling value, the high level that then output of described rest-set flip-flop is identical with described step 4-2, described or logic function block exports high level, make described air compressor (1) be held open state by described control unit, and repeat the operation of described step 4-3；
If described air pressure signal is higher than described pressure ceiling value, then described rest-set flip-flop output low level, described or logic function block output low level, make described air compressor (1) out of service by described control unit；
Step 5, described air compressor (1) is in data processing step during halted state, itself particularly as follows:
Step 5-1, contrasts the size of described air pressure signal and described pressure ceiling value；
If described air pressure signal is higher than described pressure ceiling value, then described rest-set flip-flop output low level, described or logic function block output low level, makes described air compressor (1) keep halted state by described control unit, and repeats the operation of described step 5-1；
If described air pressure signal is lower than described pressure ceiling value, then order performs the operating procedure of step 5-2；
Step 5-2, contrasts the size of described air pressure signal and described pressure low limit value；
If described air pressure signal is higher than described pressure low limit value, the low level that then output of described rest-set flip-flop is identical with described step 5-1, described or logic function block output low level, make described air compressor (1) keep halted state by described control unit, and repeat the operation of described step 5-2；
If described air pressure signal is lower than described pressure low limit value, then order performs the operation of step 5-3；
Step 5-3, contrasts the size of described air pressure signal and the low limit value of described pressure；
If described air pressure signal is higher than the low limit value of described pressure, then described rest-set flip-flop output high level, described or logic function block exports high level, opens described air compressor (1) by described control unit, and repeats the operation of described step 5-3；
If described air pressure signal is lower than the low limit value of described pressure, then described rest-set flip-flop output high level, described or logic function block exports high level, makes described air compressor (1) be held open state by described control unit, and repeats the operation of described step 5-3；
Step 6, repeats the operation to step 5 of the described step 4, adjusts the duty of described air compressor (1) according to the change of air pressure signal in real time.
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| CN1594882A (en) * | 2003-09-10 | 2005-03-16 | 日立工机株式会社 | Air compressor and control method therefor |
| CN201496243U (en) * | 2009-08-07 | 2010-06-02 | 苏州鸿本机械制造有限公司 | Digit display pressure adjusting start stop apparatus for minitype air compressor |
| CN101776072A (en) * | 2009-12-09 | 2010-07-14 | 湖北兴瑞化工有限公司 | Method for automatic matching running of multiple air compressors according to working conditions |
| CN102305209A (en) * | 2011-10-10 | 2012-01-04 | 江苏金辰针纺织有限公司 | Frequency conversion control system of air compressor |
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| JP4974574B2 (en) * | 2006-04-21 | 2012-07-11 | 中国電力株式会社 | Compressor operation diagnosis assist system |
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| CN1594882A (en) * | 2003-09-10 | 2005-03-16 | 日立工机株式会社 | Air compressor and control method therefor |
| CN201496243U (en) * | 2009-08-07 | 2010-06-02 | 苏州鸿本机械制造有限公司 | Digit display pressure adjusting start stop apparatus for minitype air compressor |
| CN101776072A (en) * | 2009-12-09 | 2010-07-14 | 湖北兴瑞化工有限公司 | Method for automatic matching running of multiple air compressors according to working conditions |
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