JP2000257566A - Compressed air supply controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize pressure of compressed air to be supplied to each load facility by optimizing operation change cycle of a compressor in accordance with changes of use amount of compressed air used in each load facility. SOLUTION: In a pressure value judging part 9 of a compressed air supply controller 8, pressure of compressed air stored in a buffer tank 5 is measured. An operation/stop control part 10 adjusts the number of units to be operated of a first to nth compressors 2a to 2n and a degree of opening of an electromagnetic valve 4 by optimizing operation change cycles tD, tU of the compressors and adjusts a degree of opening of a first to mth electromagnetic valves 6a to 6m in accordance with demands from a first to mth load facilities 7a to 7m while keeping pressure of compressed air stored in the buffer tank 5 within a fixed scope to supply compressed air by the amount demanded for the first to mth load facilities 7a to 7m based on the results of the measurement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed air supply control device for controlling the operation of a plurality of compressors and supplying compressed air having a specified pressure to load equipment.

[0002]

2. Description of the Related Art A system shown in FIG. 6 has been known as one of systems to which a compressed air supply control device for supplying and controlling compressed air to various load facilities provided in a factory or the like is applied.

[0003] A compressed air supply system 101 shown in FIG.
Are first to n-th compressors 102a to 102c that generate compressed air by compressing air based on the input operation instruction.
2n, and the first to n-th compressors 102a to 102n.
2n, and a solenoid valve for adjusting the flow rate of the compressed air output from the compressed air supply header device 103 in accordance with the input supply pressure instruction. 104
And a buffer tank 105 for temporarily storing the compressed air passing through the electromagnetic valve 104, and passing the compressed air stored in the buffer tank 105 based on requests from the first to m-th load facilities 107a to 107m. First
The first to m-th solenoid valves 10 that supply compressed air to load equipment that requires compressed air in the m-th load equipment 107a to 107m
6a to 106m and the pressure of the compressed air stored in the buffer tank 105, and based on the measurement result,
The first to n-th compressors 102a to 102n are operated, the opening degree of the electromagnetic valve 104 and the like are adjusted to maintain the pressure of the compressed air stored in the buffer tank 105 within a certain range. m solenoid valve 106a-
The opening degree of 106 m is adjusted, and the first to m-th load facilities 107 are adjusted.
a compressed air supply control device 108 for supplying the compressed air to the load equipment which requires compressed air within the range from a to 107 m.

In the compressed air supply system 101, a buffer tank 105 is controlled by a compressed air supply control device 108.
Is measured, and based on the measurement result, a predetermined operation change period T
The number of the first to n-th compressors 102a to 102n, the opening of the electromagnetic valve 104, and the like are adjusted to maintain the pressure of the compressed air stored in the buffer tank 105 within a certain range. m load equipment 107a-10
7 m to 1 m-th solenoid valve 106 a
The opening degree of the first to m-th load facilities 107
A required amount of compressed air is supplied to a to 107 m.

[0005]

By the way, in such a compressed air supply system 101, the first to n-th compressors 102a to 102n are compressors for discharging compressed air of a predetermined constant pressure from discharge ends. Are often used, the first to m-th load facilities 1
07a-107m increase the amount of compressed air used,
When the pressure drop of the compressed air stored in the buffer tank 105 is large, the compressed air supply control device 108 detects this and detects the first to n-th compressors 102a to 102a.
When the number of operating units 102n is increased, and the amount of compressed air used in the first to m-th load facilities 107a to 107m decreases and the pressure drop of the compressed air stored in the buffer tank 105 is small, Nth compressor 1
The number of operating vehicles 02a to 102n must be reduced.

For this reason, in such a compressed air supply system 101, as shown in FIGS. 7 (a) to 7 (d), every fixed operation change period T preset by the compressed air supply control device 108. The pressure value PV of the compressed air stored in the buffer tank 105 is compared with a preset set pressure value SV, and the pressure of the compressed air stored in the buffer tank 105 is determined based on the set pressure value SV. , When it is higher than the upper limit α of the specified pressure range,
When the number of operating compressors is reduced by one, and when the pressure value PV of the compressed air stored in the buffer tank 105 is lower than the lower limit value β of the specified pressure range, the number of operating compressors is reduced by one. The pressure of the compressed air stored in the buffer tank 105 is kept within a certain range by increasing the number of units.

At this time, the first to m-th load facilities 107a to 107a-1
When the supply amount of the compressed air with respect to 07 m is substantially constant, the pressure of the compressed air stored in the buffer tank 105 is substantially constant.
To the n-th compressors 102a to 102n by increasing the operation change period T, and the first to n-th compressors 102a to 102n
It is desirable to minimize the 2n operation change. Further, when the supply amount of the compressed air to the first to m-th load facilities 107a to 107m is suddenly changed,
Since the pressure of the compressed air stored in the buffer tank 105 fluctuates rapidly, it is desirable to shorten the operation change period T and change the operation of the first to nth compressors 102a to 102n as quickly as possible. Therefore, the operation change period T of the compressor is set to the first to m-th load facilities 10.
The operation change period T of the compressor required when the supply amount of the compressed air to 7a to 107m is substantially constant, and the supply amount of the compressed air to the first to mth load facilities 107a to 107m are suddenly changed. Sometimes, it is determined to be an intermediate value with the necessary operation change period T of the compressor.

For this reason, the conventional compressed air supply system 1
01, the operation of the first to n-th compressors 102a to 102n can be performed even when the supply amount of the compressed air to the first to m-th load facilities 107a to 107m is substantially constant and the number of operating compressors need not be changed. In some cases, the number was changed, and the pressure of the compressed air stored in the buffer tank 105 was out of a certain range. When the supply amount of the compressed air to the first to m-th load facilities 107a to 107m is suddenly changed, the operation change of the compressor cannot catch up and the buffer tank 105
In some cases, the pressure of the compressed air stored in the vehicle may not return to the original value for a long time while the pressure is out of a certain range.

In view of the above circumstances, the present invention provides a compressed air supply control which can optimize a compressor operation change cycle in accordance with a change in the amount of compressed air used in each load facility. It is intended to provide a device.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the first aspect of the present invention, the operation of a plurality of compressors is controlled so that the load equipment is provided with a compressed air having a specified pressure. In the compressed air supply control device for supplying
A pressure value determining unit that measures the pressure of the compressed air obtained by each of the compressors and determines a degree of the pressure of the compressed air deviating from a predetermined range based on the measurement result; and a determination by the pressure value determining unit. On the basis of the result, the operation / stop change cycle of each compressor is modified by modifying the operation / stop change cycle of the compressor according to the ratio of the pressure of the compressed air obtained by each compressor outside the predetermined range. And a stop control unit.

According to a second aspect of the present invention, in the compressed air supply control device according to the first aspect, the operation / stop control unit includes a determination result of the pressure value determination unit, a measured pressure value of the compressed air, and a set pressure value. Is determined from a preset graph showing the relationship between the deviation of the compressor and the next operation change cycle.

In the first aspect of the present invention, the pressure value judging section measures the pressure of the compressed air obtained by each compressor, and based on the measurement result, the degree to which the pressure of the compressed air is out of a predetermined range. Is determined. Based on the determination result of the pressure value determination unit, the operation / stop control unit
The operation start / stop change cycle of the compressor is corrected according to the ratio outside the predetermined range. For example, when the pressure of the compressed air obtained by each compressor is outside the first range, which is slightly out of the predetermined range, the operation / stop of each compressor is changed by extending the operation / stop change cycle of the compressor. And the pressure of the compressed air obtained by each of the compressors largely deviates from a predetermined range.
, The compressor operation / stop change cycle is shortened to change the operation / stop of each compressor. This optimizes the operation change cycle of the compressor in accordance with the change in the amount of compressed air used in each load facility, and operates the compressor when the supply of compressed air to each load facility is almost constant. Reduce the change to prevent overreaction and reduce the pressure fluctuation of the compressed air supplied to each load equipment.Also, when the supply of compressed air to each load equipment is changing suddenly, change the compressor operation quickly. The pressure of the compressed air supplied to each load equipment does not fall out of a certain range.

According to a second aspect of the present invention, in the operation / stop control unit, a preset value indicating a relationship between a judgment result of the pressure value judgment unit, a deviation between the measured value of the compressed air pressure and the set pressure value, and a next operation change cycle. The change cycle of the operation / stop of the compressor is obtained based on the graphs. With this, the operation change cycle of the compressor is optimized according to the change in the amount of compressed air used in each load facility with a simple algorithm, whereby the supply amount of compressed air to each load facility is substantially constant. In such a case, when the operation change of the compressor is reduced to prevent an excessive reaction, the pressure fluctuation of the compressed air supplied to each load equipment is reduced, and when the supply amount of the compressed air to each load equipment is suddenly changed, The operation of the compressor is quickly changed so that the pressure of the compressed air supplied to each load facility does not fall out of a certain range.

[0014]

FIG. 1 is a block diagram showing a system configuration to which an embodiment of a compressed air supply control device according to the present invention is applied.

The compressed air supply system 1 shown in FIG.
The first to n-th compressors 2a to 2n for compressing air to generate compressed air based on the input operation instruction, and the compressed air generated by the first to n-th compressors 2a to 2n is converted into one compressed air. A compressed air supply header device 3, an electromagnetic valve 4 for adjusting a flow rate of compressed air output from the compressed air supply header device 3 in accordance with an input supply pressure instruction, and a compressed air passing through the electromagnetic valve 4. Tank temporarily stores the compressed air stored in the buffer tank 5 based on requests from the first to m-th load facilities 7a to 7m. First to m-th electromagnetic valves 6a to 6m for supplying compressed air to load equipment that requires compressed air,
The pressure of the compressed air stored in the buffer tank 5 is measured, and based on the measurement results, the number of operating first to n-th compressors 2a to 2n, the opening of the electromagnetic valve 4, and the like are adjusted, and the buffer tank 5 The opening degree of the first to m-th solenoid valves 6a to 6m is adjusted while maintaining the pressure of the compressed air stored in the first embodiment within a certain range, and the first to m-th load equipment 7a is adjusted.
And a compressed air supply control device 8 for supplying compressed air to load equipment requiring compressed air within a range of 7 m.

In this case, the compressed air supply control device 8 measures the pressure of the compressed air obtained by the first to nth compressors 2a to 2n due to its function, and based on the measurement result, the pressure of the compressed air is reduced. A pressure value judging section 9 for judging the degree of departure from the predetermined range; and, based on the judgment result of the pressure value judging section 9, the pressure of the compressed air obtained by the first to n-th compressors 2a to 2n is within the predetermined range. Are outside the first range, which is slightly out of the range, the first to n-th
The second range in which the operation / stop of each compressor is changed by extending the operation / stop change cycle of the compressors 2a to 2n, and the pressure of the compressed air obtained by each compressor greatly deviates from the predetermined range. When it is outside, the operation / stop change cycle of the first to n-th compressors 2a to 2n is shortened, and the first to n-th compressors 2a to 2n
And a run / stop control unit 10 for changing the run / stop of the system.

The compressed air supply control device 8 measures the pressure of the compressed air stored in the buffer tank 5 and optimizes the operation change periods t _D and t _U of the compressor based on the measurement result. The number of operating first to n-th compressors 2a to 2n, the degree of opening of the electromagnetic valve 4, and the like are adjusted to maintain the pressure of the compressed air stored in the buffer tank 5 within a certain range. m load equipment 7a
The first to m-th solenoid valves 6a
The opening degree of ~ 6m is adjusted and the 1st ~ mth load equipment 7a ~ 7m
To supply the required amount of compressed air.

Next, the operation of this embodiment will be described in detail with reference to the flowchart shown in FIG.

First, prior to the operation of the compressed air supply system 1, first to m-th processing is performed based on simulation processing or system characteristic data obtained so far.
From the relationship between the amount of compressed air used by the load equipment 7a to 7m and the operation of the first to nth compressors 2a to 2n, the amount of change in the pressure value PV of the compressed air stored in the buffer tank 5 and the first Correlation with the number of operating nth compressors 2a to 2n is calculated, and as shown in FIG. 3, the pressure value PV of the compressed air stored in the buffer tank 5 and the preset set pressure value SV A line graph 11 showing the relationship between the deviation e from the above and the next operation change period t _D, and the pressure value PV of the compressed air stored in the buffer tank 5 as shown in FIG. Set pressure value S
A line graph 12 showing the relationship between the deviation e from V and the next operation change period t _D is obtained, and these line graphs 11 and 12 are registered in the compressed air supply control device 8.

Thereafter, when an operation start is instructed to the compressed air supply system 1, the pressure value judging section 9 of the compressed air supply control device 8 measures the pressure of the compressed air stored in the buffer tank 5. After the start, as shown in FIG. 3, the pressure value PV obtained by this pressure measuring operation is compared with a preset pressure set value SV, and a deviation e thereof (where e = SV−PV) is obtained. Is checked whether it is equal to or less than a preset lower limit value β and whether it is equal to or greater than a preset upper limit value α (steps ST1 and ST2).

Then, as shown in FIG.
Is greater than or equal to a preset upper limit α (step ST2), the operation / stop control unit 10 of the compressed air supply control device 8 sets the current operation state of the first to n-th compressors 2a to 2n. As shown in FIGS. 5B to 5D, if the first to third compressors 2a to 2c are currently in operation, the first to third compressors 2a to 2c are set. 2c, for example, the first compressor 2a is selected.
a is stopped (step ST3). Thereafter, it is again checked whether or not the deviation e is equal to or greater than a preset upper limit value α. If the deviation e is equal to or greater than the preset upper limit value α (step ST4), the operation change for the next compressor is performed. The timer necessary to obtain the period t _D is counted up (step ST5),
The current deviation e (where e = SV−PV) is calculated (step ST6), and as shown in FIG. 3, the next operation change period t _D is obtained based on the set line graph 11 (FIG. 3). Step ST7).

Thereafter, until the count value of the counter exceeds the next operation change period t _D , the above-described judgment process of the deviation e, the count-up process of the counter, and the present deviation e are calculated by the compressed air supply control device 8. The process of obtaining the next operation change period t _D based on the current deviation e obtained in this process is repeated (step ST4).
To ST8).

[0023] Then, when the count value of the counter exceeds the following operation modification period t _D (step ST8), the operation / stop control unit 10 of the compressed air supply control device 8, the first to n compressors 2a~2n , One compressor currently in operation, for example, FIG.
As shown in (d), the second and third compressors 2b, 2b
If c is currently in operation, one of the second and third compressors 2b and 2c, for example, the second compressor 2b is selected, and the second compressor 2b is stopped (step ST9). , The counter is reset to zero (step ST10).

As a result, as shown in FIG. 5A, the first range in which the pressure of the compressed air stored in the buffer tank 5 slightly deviates from the upper limit value α based on the set pressure value SV. When the pressure is outside, the operation change period t _D of the compressor is set relatively long so that the pressure of the compressed air stored in the buffer tank 5 does not change suddenly, and the pressure of the compressed air gradually decreases. When the pressure of the compressed air stored in the buffer tank 5 is outside the second range, which is greatly deviated from the upper limit α based on the set pressure value SV, the operation change cycle t _D of the compressor is short. As a result, the pressure of the compressed air stored in the buffer tank 5 is quickly reduced.

Hereinafter, the compressed air supply control device 8 operates until the pressure of the compressed air stored in the buffer tank 5 decreases and the deviation e becomes lower than the upper limit value α based on the pressure set value SV. determination process of the above-mentioned deviation e, the count up processing of the counter, calculating the deviation e of the current based on the deviation e between the present time obtained in this processing, the processing for determining the next operating modification period t _D repeats that (Steps ST4 to ST8).

Thereafter, the pressure of the compressed air stored in the buffer tank 5 decreases, and the deviation e becomes equal to the pressure set value SV.
Is lower than the upper limit value α based on
T4), this is detected by the pressure value determination section 9 of the compressed air supply control device 8, the counter is reset to zero, and the state returns to the initial state (step ST11).

A deviation e (where e = SV-PV) obtained by comparing the pressure value PV of the compressed air stored in the buffer tank 5 with the pressure set value SV is preset. If it is equal to or less than the lower limit value β (step ST1), one of the first to n-th compressors 2a to 2n which is currently stopped is operated by the operation / stop control unit 10 of the compressed air supply control device 8. Compressor, eg FIG.
As shown in (b) to (d), if the first to third compressors 2a to 2c are currently stopped, these first to third compressors 2a to 2c
After one of the compressors 2a to 2c, for example, the first compressor 2a is selected and the first compressor 2a is operated (step ST12), is the deviation e equal to or less than a preset lower limit value β? It is checked again and if the deviation e is equal to or smaller than the preset lower limit value β (step ST13), the timer necessary to obtain the next operation change period t _U is counted up (step ST14). ), Current deviation e (where e = S
(V-PV) is calculated (step ST15), and as shown in FIG. 4, the next operation change cycle t _U is obtained based on the set line graph 12 (step ST15).
16).

Thereafter, until the count value of the counter exceeds the next operation change period t _U , the above-described judgment processing of the deviation e, the count-up processing of the counter, and the present deviation e are calculated by the compressed air supply control device 8. And a process for obtaining the next operation change period t _U based on the current deviation e obtained in this process is repeated (step ST1).
3-ST17).

Then, when the count value of the counter exceeds the next operation change period t _U (step ST17), the compressed air supply control device 8 stops the current operation in the first to n-th compressors 2a to 2n. As shown in FIG. 5 (c) and (d), one compressor
If the second and third compressors 2b and 2c are currently stopped, one of the second and third compressors 2b and 2c
For example, after the second compressor 2b is selected and the second compressor 2b is set in the operating state (step S
T18), the counter is reset to zero (step ST19).

As a result, as shown in FIG. 5A, the first range in which the pressure of the compressed air stored in the buffer tank 5 slightly deviates from the lower limit value β based on the set pressure value SV. When it is outside, the operation change period t _U of the compressor is set relatively long so that the pressure of the compressed air stored in the buffer tank 5 does not change suddenly, and the pressure of the compressed air gradually increases. When the pressure of the compressed air stored in the buffer tank 5 is outside the second range which is greatly deviated from the lower limit value β based on the set pressure value SV, the operation change cycle t _U of the compressor is short. Then, the pressure of the compressed air stored in the buffer tank 5 is rapidly increased.

Thereafter, the compressed air supply control device 8 operates as described above until the pressure of the compressed air stored in the buffer tank 5 increases and the deviation e becomes higher than a lower limit β based on the pressure set value SV. The above-described determination process of the deviation e, the count-up process of the counter, the process of calculating the current deviation e, and the process of obtaining the next operation change period t _U based on the current deviation e obtained in this process are repeated. (Steps ST13 to ST17).

Thereafter, the pressure of the compressed air stored in the buffer tank 5 increases, and the deviation e becomes equal to the pressure set value SV.
Is higher than the lower limit value β based on (step S
T13), this is detected by the compressed air supply control device 8, and the counter is reset to return to the initial state (step ST20).

As described above, in this embodiment, the pressure of the compressed air stored in the buffer tank 5 is measured by the pressure value judgment section 9 of the compressed air supply control device 8, and the operation / operation is performed based on the measurement result. while optimizing operation modification period t _D, t _U of the compressor by the stop control section 10, the number of driving first to n compressors 2 a to 2 n, etc. by adjusting the opening degree of the electromagnetic valve 4, stored in the buffer tank 5 In response to requests from the first to m-th load facilities 7a to 7m, the first
The opening degrees of the m-th electromagnetic valves 6a to 6m were adjusted to supply the required amount of compressed air to the first to m-th load equipments 7a to 7m.

For this reason, the first to m-th load facilities 7a to 7m
The operation change periods t _D and t _U of the compressor can be optimized in accordance with the change in the amount of compressed air used in the step (a), whereby the supply amount of the compressed air to the first to m-th load facilities 7a to 7m can be reduced. When it is almost constant, the first
The operation change of the nth compressor 2a to 2n can be reduced to prevent an excessive reaction, and the pressure fluctuation of the compressed air supplied to the first to mth load equipments 7a to 7m can be reduced. When the supply amount of the compressed air to the m load facilities 7a to 7m is suddenly changed, the operation of the first to n-th compressors 2a to 2n is quickly changed to perform the first to m-th compressor operations.
The pressure of the compressed air supplied to the load equipment 7a to 7m can be prevented from deviating from a certain range.
Effect).

Further, in this embodiment, prior to the operation of the compressed air supply system 1, simulation processing,
Alternatively, based on the relationship between the amount of compressed air used by the first to m-th load facilities 7a to 7m and the operation contents of the first to n-th compressors 2a to 2n, the buffer The correlation between the amount of change in the pressure value PV of the compressed air stored in the tank 5 and the number of operating first to n-th compressors 2a to 2n is calculated, and the pressure of the compressed air stored in the buffer tank 5 is calculated. and the deviation e between the set pressure value SV which is set in advance to a value PV, have created a line graph 11 showing the relationship to the next operation modification period t _D in the compressed air supply control device 8, the pressure measurement A deviation e (where e = SV−) obtained by comparing a pressure value PV obtained by the operation with a preset pressure set value SV.
PV) and the line graphs 11 and 12 are used to determine the next operation change periods t _D and t _U.

Therefore, the next operation change period t is calculated from the deviation e.
The algorithm for determining _D and t _U is simplified, and the processing load on the compressed air supply control device 8 is reduced, while the amount of compressed air used in the first to m-th load facilities 7a to 7m is changed. Te, driving modification period t _D of the compressor, can be optimized t _U, whereby when the first to like supply of compressed air for the first m load facility 7a~7m is substantially constant, first ~ Nth compressor 2a ~ 2n
, The excess reaction can be prevented, the pressure fluctuation of the compressed air supplied to the first to m-th load facilities 7a to 7m can be reduced, and the first to m-th load facilities 7a to 7m can be reduced.
When the supply amount of the compressed air to 7 m is suddenly changed, the operation of the first to n-th compressors 2 a to 2 n is quickly changed, and the compressed air supplied to the first to m-th load facilities 7 a to 7 m is changed. The pressure can be prevented from deviating from a certain range (the effect of claim 2).

As described above, in each of the above-described embodiments, the pressure value PV is obtained by measuring the pressure of the compressed air stored in the buffer tank 5 by the compressed air supply control device 8. , For example, each pipe portion connecting the buffer tank 5 and the first to m-th electromagnetic valves 6a to 6m, or the first to m-th electromagnetic valves 6a to 6m
The pressure value PV may be obtained by measuring the pressure of the compressed air at each of the piping sections connecting the first to m-th load facilities 7a to 7m.

Also in this case, similarly to the above-described embodiment, the operation change cycle t _{D of} the compressor is changed according to the change in the amount of compressed air used in the first to m-th load facilities 7a to 7m. t _U can be optimized, and when the supply amount of the compressed air to the first to m-th load facilities 7a to 7m is substantially constant, the operation change of the first to n-th compressors 2a to 2n is performed. , The excess reaction can be prevented, the pressure fluctuation of the compressed air supplied to the first to m-th load equipment 7a to 7m can be reduced, and the compressed air for the first to m-th load equipment 7a to 7m can be reduced. When the supply amount of the compressor 2a suddenly changes, the first to n-th compressors 2a
Ｎ2n can be quickly changed so that the pressure of the compressed air supplied to the first to m-th load facilities 7a to 7m does not deviate from a certain range.

In the above-described embodiment, linear functions are used as the line graphs 11 and 12. However, various functions depending on the characteristics of the compressor, such as quadratic functions and cubic functions, may be used. good.

[0040]

As described above, according to the present invention, in the compressed air supply control device of the first aspect, the operation change period of the compressor is changed according to the change in the amount of compressed air used in each load facility. When the amount of compressed air supplied to each load equipment is almost constant, optimization of the compressor operation can be reduced to prevent over-reaction and prevent the compressor from being supplied to each load equipment. When the pressure fluctuation of the air can be reduced and the supply amount of the compressed air to each load equipment changes suddenly, the operation of the compressor is changed quickly and the pressure of the compressed air supplied to each load equipment is changed. Can be kept out of a certain range.

In the compressed air supply control device according to the second aspect, the operation change cycle of the compressor can be optimized by a simple algorithm in accordance with the change in the amount of compressed air used in each load facility. When the supply of compressed air to each load facility is almost constant,
It is possible to reduce the change in compressor operation, prevent excessive reaction, reduce the pressure fluctuation of the compressed air supplied to each load equipment, and change the compressed air supply amount to each load equipment suddenly. At times, the operation of the compressor can be changed quickly so that the pressure of the compressed air supplied to each load facility does not deviate from a certain range.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration to which an embodiment of a compressed air supply control device according to the present invention is applied.

FIG. 2 is a flowchart showing an operation of the compressed air supply control device shown in FIG.

FIG. 3 is an explanatory diagram showing an example of a line graph used when the next operation change period t _{D is obtained} by the compressed air supply control device shown in FIG. 1;

FIG. 4 is an explanatory diagram showing an example of a line graph used when the next operation change period t _{U is obtained} by the compressed air supply control device shown in FIG. 1;

FIG. 5 is a timing chart showing an operation example of the compressed air supply control device shown in FIG.

FIG. 6 is a block diagram illustrating an example of a compressed air supply system to which a conventionally known compressed air control device is applied.

FIG. 7 is a timing chart showing an operation example of the compressed air supply control device shown in FIG.

[Explanation of symbols]

 1: Compressed air supply system 2a to 2n: 1st to nth compressor 3: Compressed air supply header device 4: Electromagnetic valve 5: Buffer tank 6a to 6m: 1st to mth electromagnetic valve 7a to 7m: 1st to 1st m load equipment 8: compressed air supply control unit 9: pressure value judgment unit 10: operation / stop control unit 11, 12: line graph

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadao Kikuchi 1-1-1, Shibaura, Minato-ku, Tokyo F-term in the head office of Toshiba Corporation (reference) 3H045 AA09 AA16 AA26 BA20 BA28 CA04 CA29 DA01 DA16 DA31 DA47 EA35 EA36

Claims (2)

[Claims] 1. A compressed air supply control device for controlling operation / stop of a plurality of compressors and supplying compressed air of a specified pressure to a load facility, wherein a pressure of the compressed air obtained by each of the compressors is controlled. And a pressure value determining unit that determines the degree to which the pressure of the compressed air is out of a predetermined range based on the measurement result.Based on the determination result of the pressure value determining unit, the pressure value is obtained by each of the compressors. An operation / stop control unit that changes the operation / stop change cycle of the compressor in accordance with the ratio of the pressure of the compressed air out of the predetermined range to change the operation / stop of each compressor. Compressed air supply control device. 2. The compressed air supply control device according to claim 1, wherein the operation / stop control unit determines a determination result of the pressure value determination unit and a deviation between a measured pressure value of the compressed air and a set pressure value. A compressed air supply control device, wherein a compressor operation / stop change period is obtained from a preset graph indicating a relationship with a next operation change period.