JP2014074395A - Compressor operation control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor operation control device capable of reducing power consumption while dispensing with setting of a control pressure width and a reserve pressure width.SOLUTION: A compressor operation control device 10 controls starts and stops of a plurality of compressors 210, 211, 220, 230, 310, 320, 330, 331 on the basis of virtual capacities, by determining a prescribed one of invertor compressors 210, 211, 220, 230 as a reference compressor, and applying a ratio of a discharge air volume of each of the other compressors to a discharge air volume of the reference compressor, as the virtual capacity of the compressor, in controlling operations of the plurality of compressors 210, 211, 220, 230, 310, 320, 330, 331 in parallel operations of the plurality of invertor compressors 210, 211, 220, 230 and constant speed compressors 310, 320, 330, 331, which generate compressed air.

Description

  The present invention includes a plurality of inverter-type compressors that generate compressed air by changing the rotation speed by an inverter and a constant-speed compressor that generates compressed air at a constant rotation speed, and the plurality of compressors are arranged in parallel. The present invention relates to a compressor operation control device that controls the operation of the plurality of compressors of a compressed air supply device that supplies and supplies compressed air that is generated by operation.

  The conventional compressed air supply system is operated efficiently in parallel by combining an inverter type compressor that can change the discharge air volume by changing the rotation speed with an inverter and a constant speed compressor with a constant discharge air volume. There are things that try to save energy.

  That is, the constant speed compressor is responsible for the base air volume, and the inverter type compressor is responsible for the fluctuating air volume portion so as to achieve energy-saving operation without waste. For example, a compressor number control system as disclosed in Patent Document 1 is known.

  In this Patent Document 1, as shown in FIG. 4, the control pressure range is downward from the target pressure to the negative side LLL (0.52 MPa).

JP 2005-48755 A

  However, when detecting the pressure of the piping that sends the combined compressed air to the compressed air demand device and controlling it by this detected pressure, when any control operation is performed after detecting the lower limit value LLL of the control pressure range There has been a problem that operation delay in control may occur.

  In order to eliminate this problem and ensure the minimum supply pressure, it is necessary to provide a margin pressure width on the minus side with respect to the lower limit value LLL. Here, if the target pressure is estimated to be an intermediate value between H and L, it is 0.57 MPa.

  Generally, 8% power consumption can be reduced by reducing the supply pressure by 0.1 MPa. Therefore, if the target pressure can be lowered by 0.04 MPa from 0.57 MPa to 0.53 MPa, for example, power consumption of 3.2% can be reduced.

  The present invention has been made paying attention to such problems of the conventional technology, and it is unnecessary to set the control pressure width and the marginal pressure width so that the power consumption can be reduced. The object is to provide a control device.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] Inverter compressors (210, 211, 220, 230) for generating compressed air by changing the rotational speed by an inverter, and constant speed compressors (310, 320, 330, for generating compressed air at a constant rotational speed) 331) A plurality of units are provided, and compressed air generated by operating the plurality of compressors (210, 211, 220, 230, 310, 320, 330, 331) in parallel is joined to keep the supply pressure constant. In the compressor operation control device (10) for controlling the operation of the plurality of compressors (210, 211, 220, 230, 310, 320, 330, 331) of the compressed air supply device (1) to be supplied to the supply destination ,
A predetermined one of the inverter compressors (210, 211, 220, 230) is set as a reference compressor, and the ratio of the discharge air amount of each of the other compressors to the discharge air amount of the reference compressor is set for each compressor. A compressor operation control device characterized by having a virtual capacity and controlling the start and stop of the plurality of compressors (210, 211, 220, 230, 310, 320, 330, 331) using the virtual capacity (10).

[2] Inverter compressors (210, 211, 220, 230) for generating compressed air by changing the rotational speed by an inverter, and constant speed compressors (310, 320, 330, for generating compressed air at a constant rotational speed) 331) A plurality of units are provided, and compressed air generated by operating the plurality of compressors (210, 211, 220, 230, 310, 320, 330, 331) in parallel is joined to keep the supply pressure constant. In the compressor operation control device (10) for controlling the operation of the plurality of compressors (210, 211, 220, 230, 310, 320, 330, 331) of the compressed air supply device (1) to be supplied to the supply destination ,
A predetermined one of the inverter compressors (210, 211, 220, 230) is set as a reference compressor, and the load factor when the reference compressor is operated at the maximum air volume is the maximum load factor of the reference compressor. Virtual capacity,
The inverter compressor other than the reference compressor has a load factor of the reference compressor when the reference compressor is operated at a substantially maximum air flow as a first load factor, and one of the other inverter compressors is maximized. The load factor of the reference compressor when operated with the air flow is the second load factor, and the load factor of the reference compressor when one of the other inverter compressors is operated with the minimum air flow is the third load factor. ,
The value obtained by subtracting the second load factor from the first load factor is set as the maximum load factor virtual capacity of the other inverter compressor,
A value obtained by subtracting the third load factor from the first load factor is set as the minimum load factor virtual capacity of the other inverter compressor,
When the reference compressor is operated at a substantially maximum air flow, and the constant speed compressor to be compared is operated, the load factor of the reference compressor is the fourth load factor,
The value obtained by subtracting the fourth load factor from the first load factor is the maximum load factor virtual capacity of the compared constant speed compressor,
From the sum of the maximum load factor virtual capacity of the inverter compressor in operation, the subtraction value of the total of the actual load factor virtual capacity, which is the actual load factor virtual capacity of the inverter compressor in operation, is defined as the total no-load virtual capacity,
When the amount of compressed air used at the supply destination increases and the total no-load virtual capacity becomes equal to or less than a preset startup virtual capacity setting value, a startup signal is acquired,
The amount of compressed air used at the supply destination is reduced, and the total no-load virtual capacity is determined by the start virtual capacity set value, the preset stop virtual capacity set value, and the inverter compressor (210, 211, 220, 230). And the total no-load virtual capacity is equal to or greater than the sum of the actual load virtual capacity of the scheduled machine to be stopped and the constant virtual compressor (310). , 320, 330, 331), a stop signal is acquired when the total of the actual load virtual capacity of the scheduled stop machine is exceeded,
Compressor operation control device (3), wherein start and stop of the plurality of compressors (210, 211, 220, 230, 310, 320, 330, 331) are controlled by the acquired start signal and stop signal. 10).

[3] Inverter compressors (210, 211, 220, 230) for generating compressed air by changing the rotational speed by an inverter and constant speed compressors (310, 320, 330, for generating compressed air at a constant rotational speed) 331) A plurality of units are provided, and compressed air generated by operating the plurality of compressors (210, 211, 220, 230, 310, 320, 330, 331) in parallel is joined to keep the supply pressure constant. In the compressor operation control device (10) for controlling the operation of the plurality of compressors (210, 211, 220, 230, 310, 320, 330, 331) of the compressed air supply device (1) to be supplied to the supply destination ,
A predetermined one of the inverter compressors (210, 211, 220, 230) is set as a reference compressor, and the load factor when the reference compressor is operated at the maximum air volume is the maximum load factor of the reference compressor. Virtual capacity,
The inverter compressor other than the reference compressor has a load factor of the reference compressor when the reference compressor is operated at a substantially maximum air flow as a first load factor, and one of the other inverter compressors is maximized. The load factor of the reference compressor when operated with the air flow is the second load factor, and the load factor of the reference compressor when one of the other inverter compressors is operated with the minimum air flow is the third load factor. ,
The value obtained by subtracting the second load factor from the first load factor is set as the maximum load factor virtual capacity of the other inverter compressor,
A value obtained by subtracting the third load factor from the first load factor is set as the minimum load factor virtual capacity of the other inverter compressor,
When the reference compressor is operated at a substantially maximum air flow, and the constant speed compressor to be compared is operated, the load factor of the reference compressor is the fourth load factor,
The value obtained by subtracting the fourth load factor from the first load factor is the maximum load factor virtual capacity of the compared constant speed compressor,
The sum of the maximum operating virtual capacity that is the maximum virtual capacity of the constant-speed compressor during operation and the total of the actual load virtual capacity that is the actual virtual capacity of the inverter compressor that is actually operating under load. Is the total operating virtual capacity, and if the scheduled stop machine is a constant speed compressor (310, 320, 330, 331), the maximum virtual capacity of the scheduled stop machine is the virtual capacity of the scheduled stop machine, and the scheduled stop machine is inverter-compressed. For the machines (210, 211, 220, 230), the actual load virtual capacity of the machine scheduled to be stopped is set as the virtual capacity of the machine scheduled to be stopped,
From the sum of the maximum load factor virtual capacity of the inverter compressor in operation, the subtraction value of the total of the actual load factor virtual capacity, which is the actual load factor virtual capacity of the inverter compressor in operation, is defined as the total no-load virtual capacity,
Set the start rate setting value and the stop rate setting value in percentage display for the total operating virtual capacity,
Multiplying the total operating virtual capacity by the value obtained by multiplying the activation rate setting value by 1/100 to calculate the virtual capacity for activation,
Comparing the virtual capacity for activation and the total no-load virtual capacity, an activation signal is acquired when the virtual capacity for activation is larger,
A value obtained by adding the start rate set value and the stop rate set value and multiplying by 1/100 is calculated, and the calculated value is obtained by subtracting the virtual capacity of the scheduled machine from the total operating virtual capacity. To calculate the virtual capacity for stopping by adding the virtual capacity of the scheduled stop machine to the multiplied value,
Comparing the virtual capacity for the stop and the total no-load virtual capacity, a stop signal is obtained when the virtual capacity for the stop is smaller than the total no-load virtual capacity,
Compressor operation control device (3), wherein start and stop of the plurality of compressors (210, 211, 220, 230, 310, 320, 330, 331) are controlled by the acquired start signal and stop signal. 10).

[4] An acquisition function for acquiring a start signal and a stop signal in the compressor operation control device (10) described in [2], and an operation in the compressor operation control device (10) described in [3]. Signal and stop signal acquisition function,
When at least one of the two start signal and stop signal acquisition functions is determined to acquire the start signal, the start signal is acquired,
A stop signal is acquired when stop signal acquisition is determined by both of the two start signal and stop signal acquisition functions,
Compressor operation control device (3), wherein start and stop of the plurality of compressors (210, 211, 220, 230, 310, 320, 330, 331) are controlled by the acquired start signal and stop signal. 10).

[5] calculating a first total value obtained by summing up the maximum virtual capacity, the start virtual capacity setting value, and the stop virtual capacity setting value of the scheduled start machines of the constant speed compressor group (310, 320, 330, 331);
Calculate the total pressure adjustment virtual capacity value that is the sum of the pressure adjustment virtual capacity of each inverter compressor that is operating,
When the first total value is smaller than the value of the total pressure adjustment virtual capacity, the scheduled start machine of the constant speed compressor is set as the activation designated machine,
When the first total value is equal to or greater than the value of the total pressure adjustment virtual capacity, the starter machine of the inverter compressor is set as the starter specified machine,
The pressure adjustment virtual capacity is obtained by subtracting the minimum load ratio virtual capacity from the maximum load ratio virtual capacity of the inverter compressor, and each pressure adjustment virtual capacity of the inverter compressor in operation is excluded from the inverter compressor scheduled to be stopped. The total capacity is calculated as a total pressure-adjusted virtual capacity, and the maximum virtual capacity of the largest constant virtual compressor among the operating constant speed compressors, the start virtual capacity set value, and the stop virtual capacity set value Calculate the second total value, which is the sum,
When the second total value is smaller than the total pressure adjustment virtual capacity, the stop scheduled machine of the inverter compressor is set as the stop designated machine,
When the second total value is equal to or greater than the total pressure adjustment virtual capacity, the compressor operation control device (10) according to [2], wherein the stop scheduled machine of the constant speed compressor is set as a stop designated machine.

[6] The pressure adjustment virtual capacity is obtained by subtracting the minimum load ratio virtual capacity from the maximum load ratio virtual capacity of the inverter compressor, and each pressure of the inverter compressor in operation, excluding the inverter compressor scheduled to be stopped. Calculate the total adjusted virtual capacity as the total pressure adjusted virtual capacity,
A value obtained by dividing the added value of the starting rate setting value and the stopping rate setting value by 100 is multiplied by the total operating virtual capacity to calculate the multiplied value, and the multiplied value is calculated for the constant speed compressor of the scheduled starter Calculate the added value by adding the maximum virtual capacity, and compare the added value with the total pressure adjustment virtual capacity of the inverter compressor currently in operation,
When the added value obtained by adding the maximum virtual capacity is smaller than the total pressure adjustment virtual capacity, the start-up machine of the constant speed compressor is set as the start designated machine, and the added value obtained by adding the maximum virtual capacity is the total pressure adjustment virtual capacity. When the capacity exceeds the capacity, the starter machine of the inverter compressor is designated as the start designated machine,
Calculate the division value by dividing the sum of the starting rate setting value and the stopping rate setting value by 100, and calculate the total value of the maximum virtual capacity excluding the maximum virtual capacity of the compressor with the largest maximum virtual capacity in the operating constant speed compressor A multiplication value is calculated by multiplying the third total value obtained by adding the value and the total actual load virtual capacity of the operating inverter compressor with the division value, and the maximum virtual capacity is calculated by the multiplication value and the constant speed compressor during operation. The maximum virtual capacity addition value α of the largest compressor is calculated, and the addition value α is compared with the total pressure adjustment virtual capacity value β of the inverter compressor other than the inverter compressor that is scheduled to be stopped during operation.
When α is smaller than β, the inverter compressor's scheduled stop machine is the stop designated machine,
The compressor operation control device (10) according to [3], wherein when α is β or more, the scheduled stop machine of the constant speed compressor is set as the stop designated machine.

[7] A designated machine selection function for selecting a start designated machine and a stop designated machine in the compressor operation control apparatus (10) described in [5], and a compressor operation control apparatus ( A designated machine selection function for selecting a start designated machine and a stop designated machine in 10),
For the designation of the scheduled machine, if the selection obtained by both of the designated machine selection functions is the same, the scheduled machine is designated as selected, and at least one of the designated machine selection functions activates the inverter compressor. When the planned machine is selected, the inverter compressor is designated as the start-up machine,
Regarding the designation of the scheduled stop machine, if the selection obtained by both of the designated machine selection functions is the same, the scheduled stop machine is designated as selected, and when at least one of the selected inverter compressors is selected, the inverter compressor Compressor operation control apparatus for controlling start and stop of the plurality of compressors (210, 211, 220, 230, 310, 320, 330, 331) using a scheduled stop machine as a stop designation machine (10).

The present invention operates as follows.
According to the compressor operation control device (10) according to the above [1], one inverter compressor is set as a reference compressor, and the ratio of the discharge air amount of each of the other compressors to the discharge air amount of the reference compressor. Is used as the virtual capacity of each compressor, and the start and stop of the plurality of compressors are controlled using the virtual capacity, so that it is possible to control the operation of the compressor without measuring the pressure change of the supplied compressed air. It is.

  According to the compressor operation control device (10) according to the above [2] and [3], the setting value for the virtual capacity is set for the start and stop of the compressor, and the start signal and the stop signal are acquired. By appropriately selecting the set value, it is possible to optimally adjust the operation control of the compressor.

  According to the compressor operation control device (10) according to the above [4], the set value for the virtual capacity can be set with different types, so that the start signal and the stop signal are acquired in the operation control of the compressor. It is possible to broaden the manner of determination.

  According to the compressor operation control device (10) according to the above [5] and [6], the pressure of the supplied compressed air is increased from the acquisition of the start signal and the stop signal to the specification of the start scheduled machine and the stop scheduled machine. Since the measurement is performed with various virtual capacities and set values that can be appropriately set in advance without measurement, the operation control of the compressor can be further optimally adjusted.

  According to the compressor operation control device (10) according to the above [7], from the acquisition of the start signal and the stop signal to the designation of the scheduled start machine and the designation of the scheduled stop machine, various measures are taken without measuring the pressure of the supplied compressed air. Since the setting value for the virtual capacity can be set with different types, the judgment for obtaining the start signal and the stop signal in the compressor operation control can be performed. This aspect can be further expanded.

  According to the compressor operation control device according to the present invention, since the measurement of the change in pressure of the compressed air to be supplied is not used for the operation control of the compressor, the control is performed with a constant pressure. The pressure drop due to air delay can be prevented by the no-load capacity of the inverter compressor in operation, which can be used as the supply pressure can be sent as close as possible to the pressure required by the supply destination. Power consumption can be reduced by eliminating power consumption.

  In addition, the excessive discharge capacity at the time of additional start-up of the compressor selects the order of starting and stopping the inverter compressor and constant speed compressor so that it can be absorbed by the inverter compressor. Can be prevented.

  Also, by defining a reference compressor, virtualizing it, operating the reference compressor and other individual compressors in parallel, and determining the discharge capacity ratio of the reference compressor and other compressors, the reference compression Since the virtual capacity expression of the machine and the capacity expression of other compressors are unified, it is possible to add up each of the maximum operating virtual capacity and the operating virtual capacity, enabling control using the total no-load virtual capacity. Yes. Furthermore, it is possible to easily perform control in which a plurality of inverter compressors having different capacities and a plurality of constant speed compressors having different capacities are operated in parallel.

It is a control flow which shows the outline of the whole control of the compressor operation control apparatus which concerns on one embodiment of this invention. It is a schematic block diagram which shows the outline of a structure of the compressed air supply apparatus controlled by the compressor operation control apparatus which concerns on one embodiment of this invention. It is a flow which shows selection of the starting plan machine by control of the compressor operation control apparatus which concerns on one embodiment of this invention. It is a flow which shows selection of the scheduled stop machine by control of the compressor operation control apparatus which concerns on one embodiment of this invention. It is a block diagram which shows an Example schematically. It is a screen figure which shows the system control unit selection screen displayed on the compressor operation control apparatus in an Example. It is a screen figure which shows the model of a compressor displayed on the compressor operation control apparatus in an Example, and the selection screen of a reference | standard machine. It is a screen figure which shows the setting screen of the virtual capacity by selection of the measuring method of No. 1 compressor displayed on the compressor operation control apparatus in an Example, and driving | operation. It is a screen figure which shows the setting screen of the virtual capacity by selection of the measuring method of No. 2 compressor displayed on the compressor operation control apparatus in an Example, and driving | operation. It is a screen figure which shows the setting screen of the selection of the measuring method of No. 3 compressor displayed on the compressor operation control apparatus in an Example, and the virtual capacity setting by driving | operation. It is a screen figure which shows the setting screen of the virtual capacity by selection of the measuring method of No. 4 compressor displayed on the compressor operation control apparatus in an Example, and driving | operation. It is a screen figure which shows the setting screen of the virtual capacity by selection of the measuring method of No. 5 compressor displayed on the compressor operation control apparatus in an Example, and driving | operation. It is a screen figure which shows the screen of the setting of the compressor large / medium / small capacity setting and switching control displayed on the compressor operation control apparatus in an Example. It is a screen figure which shows description of the method of the setting displayed on the compressor operation control apparatus in an Example. It is a graph which shows transition of the driving | operation maximum electric virtual capacity | capacitance and driving | operation electric virtual capacity | capacitance in an Example. It is a graph which shows transition of the driving | operation maximum electric virtual capacity | capacitance and driving | operation electric virtual capacity | capacitance in an Example. It is a graph which shows transition of the driving | operation maximum electric virtual capacity | capacitance and driving | operation electric virtual capacity | capacitance in an Example.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
Each figure shows an embodiment of the present invention.
FIG. 1 is a control flow showing an outline of the overall control of the compressor operation control apparatus 10 according to the present embodiment. FIG. 2 is a schematic configuration diagram showing an outline of the compressed air supply device 1 controlled by the compressor operation control device 10.

  The compressed air supply device 1 includes a plurality of inverter compressors 20 and a plurality of constant speed compressors 30 in a compressor, and the plurality of compressors 20 and 30 are operated in parallel to generate compressed air. . The compressed air generated by the compressor being driven merges through the compressed air pipe 40 and is stored in the air tank 50 before being sent out to the supply destination.

  The inverter compressor 20 is capable of adjusting the discharge air volume while keeping the discharge pressure constant by changing the rotation speed with the inverter. In FIG. 2, two large-capacity inverter compressors 210 and 211, one medium-capacity inverter compressor 220, and one small-capacity inverter compressor 230 are a plurality of inverter compressors 20. As an example.

  These are so-called package type compressors in which pressure detection means, discharge pressure setting means, an inverter, a motor, an air compressor and the like are integrated, and are a screw type in which the rotation speed of the air compressor is constant. The compressor has a slide valve structure in the screw part, and the discharge air volume is variable while the discharge pressure remains constant. The inverter is PID controlled.

  The constant speed compressor 30 generates compressed air with a constant discharge speed and a constant discharge air volume. In FIG. 2, one large-capacity constant-speed compressor 310, one medium-capacity constant-speed compressor 320, and two small-capacity constant-speed compressors 330 and 331 are a plurality of constant-speed compressors. Illustrated as a fast compressor 30.

  The constant-speed compressor 30 has a constant rotation speed, and the adjustment of the discharge air volume is accompanied by pressure fluctuation or the rotation speed is constant, and the discharge air volume is turned on and off by a pressure switch for adjusting the discharge air volume. Alternatively, the electric motor is turned on and off by a pressure switch.

  In FIG. 2, predetermined wiring is provided between the compressor operation control device 10 and the compressors 20 and 30. Further, in FIG. 2, practical arrows indicate a start signal and a stop signal, which will be described later, and a fine broken line arrow indicates a signal for notifying the state of a load sent from each compressor, and is indicated by another broken line. An arrow indicates a signal notifying that the vehicle is in operation.

  The compressor operation control device 10 includes a programmable controller. In addition, an operation unit for performing various settings performed by the operator is provided. The control condition setting and the operation state display are performed by, for example, a touch panel.

  The programmable controller incorporates a unit control program for unit control and a control condition setting program for setting control conditions. The number control program includes a start program for starting the compressor, a stop program for stopping the compressor in operation, an optimization program for controlling the operation number of the inverter compressor and the constant speed compressor, an inverter compressor, A group program of constant speed compressors and a compressor capacity grouping program within the group, a selection program for selecting a scheduled start machine and a scheduled stop machine from a small capacity machine or a small capacity machine group, and the initial stage of the compressed air supply device 1 This is an initial operation program for operation.

  Control condition setting programs include virtual capacity unit selection, compressor model and reference machine selection, measurement method selection and virtual capacity setting for each compressor, setting for start signal, setting for stop signal, stop Signal acquisition time setting, compressor large / medium / small capacity specification, inching time setting, initial operation time setting, compressor operation selection (continuous, automatic, off selection), compressor operation control device operation switch (ON, This is a program for urging the operator to make settings such as (OFF), etc., and for making various settings in response to the operation of the operator.

Next, control by the compressor operation control device 10 will be described.
In the present embodiment, one reference compressor is determined from a plurality of inverter compressors 20 and virtual capacity is defined (definition will be described later), and the selected reference compressor and other individual compressors are arranged in parallel. By operating and obtaining the discharge capacity ratio of the reference compressor and other individual compressors, the virtual capacity expression of the reference compressor and the capacity expression of the other compressors are unified, and as a result, the maximum operating Each of the virtual capacity and the operating virtual capacity can be summed, and control using the total no-load virtual capacity is enabled.

  Here, in the selection of the reference compressor, a model in which the ratio of the discharge air volume is indicated by the load factor in the large capacity inverter compressors 210 and 211 is designated. When using an inverter compressor that does not indicate a load factor, the load factor may be obtained in advance by measuring operating current, power consumption, air volume, and the like. The relationship between the discharge air volume and the load factor, the operating current value, or the power consumption value is almost proportional.

  Accordingly, the measurement values at the time of the upper limit air volume of the fine pressure adjustment unit (hereinafter referred to as “maximum air volume”) and the measurement value of the lower limit air volume of the fine pressure adjustment unit (hereinafter referred to as “minimum air volume”) are recorded in advance. By doing so, the actual discharge air volume can be calculated as the load factor from the measured current value and the measured power value during operation from the two measured values.

[Virtualization of standard compressor]
In order to increase the virtual capacity of the standard compressor, the discharge pressure of the standard compressor is changed to the supply pressure of the compressed air supply destination when the compressed air load at the compressed air supply destination is constant, such as before the start of work at the office. Set and run the reference compressor. Next, the load of the compressed air load is adjusted and the load factor when operating at the maximum air volume is recorded. The load factor at the maximum air volume is defined as the maximum load factor virtual capacity of the reference compressor. Next, the load factor when the compressed air load is adjusted and the engine is operated at the minimum air volume is recorded. The load factor at the time of this minimum air volume is defined as the minimum load factor virtual capacity of the reference compressor.

[Virtual capacity of other inverter compressors]
In order to make the inverter compressor other than the reference compressor into a virtual capacity, the discharge pressure of the reference compressor is set to the supply pressure of the compressed air supply destination, and the reference compressor is operated at a substantially maximum air volume. The first load factor of the reference compressor at this time is recorded, and then one of the other inverter compressors to be compared is operated with the maximum air flow and the minimum air flow. At this time, the second load factor of the reference compressor when operating at the maximum air volume and the third load factor of the reference compressor when operating at the minimum air volume are recorded.

Here, the first load factor−the second load factor = the maximum load factor virtual capacity of the compared inverter compressor is defined.
Moreover, it defines as 1st load factor-3rd load factor = the minimum load factor virtual capacity of the compared inverter compressor.

[Virtual capacity of constant speed compressor]
Similarly to the above, the first load factor of the reference compressor is recorded when the reference compressor is operated at substantially the maximum air flow, and then the reference compressor No. when the constant speed compressor to be compared is operated is recorded. 4 Record the load factor.
Here, the first load factor−the fourth load factor = the maximum load factor virtual capacity of the compared constant speed compressor is defined.

  The load factor virtual capacity as described above is obtained when the maximum discharge air volume of the reference compressor is 100% or 103%, for example, and the discharge capacity ratio of the compressor to be compared is 80% or 50% or the like. Hereinafter, the virtual capacity expressed with such a load factor is referred to as “rate (%) virtual capacity”.

  Although control is possible even with this rate (%) virtual capacity, the two concepts of electric virtual capacity and air volume virtual capacity can be used as conceptual expressions that are easy to understand for the operator of the compressor operation control device 10. .

“Electrical virtual capacity” is obtained by multiplying the numerical value of the load factor virtual capacity expressed in% to the decimal point, and multiplying the shaft power value (catalog value) of the reference compressor, and the unit is kW.
“Air volume virtual capacity” is the value obtained by changing the numerical value of the load factor virtual capacity displayed in% to the decimal point and multiplying it by the discharge air volume value (catalog value) of the standard compressor. The unit is m ³ / min. is there.
The catalog value is a value displayed for the compressor by the manufacturer of the compressor.

[Acquisition of start signal and stop signal by virtual capacity]
Next, the case where the start signal for starting the compressor and the stop signal for stopping the compressor are acquired using the virtual capacity will be described.

Here, the total operating virtual capacity and the total no-load virtual capacity are defined.
“Total operating virtual capacity” refers to the total of the maximum operating virtual capacity that is the maximum virtual capacity of the constant-speed compressor during operation and the actual load virtual capacity that is the virtual capacity of the inverter compressor that is actually operating under load. This is an added value with the total capacity.

The “total no-load virtual capacity” refers to a subtracted value of the total actual virtual capacity of the operating inverter compressor from the total maximum virtual capacity of the operating inverter compressor.
Set the "Start virtual capacity setting value" and "Stop virtual capacity setting value" for this total no-load virtual capacity, compare the start virtual capacity setting value with the total no-load virtual capacity, Then, the sum of the starting virtual capacity setting value, the stopping virtual capacity setting value and the virtual capacity of the compressor is compared with the total no-load virtual capacity to obtain a stop signal. For acquisition of a stop signal, a stop signal acquisition standby time is also set. The “stop signal acquisition standby time setting value” for this purpose is to set a predetermined time from when the stop is determined until the stop signal is obtained and the stop is executed.

  Here, the “starting virtual capacity setting value” is set to a value that allows the compressor to be started with a sufficient margin while keeping the total no-load virtual capacity at or above the starting virtual capacity setting value. Further, the “stop virtual capacity setting value” is set to a value at which the total no-load virtual capacity can be obtained after the stop until the start signal is detected so that the start signal is not obtained immediately after the compressor is stopped. This starting virtual capacity setting value is determined by the use fluctuation of the compressed air at the supply destination and the capacity of the compressor.

  FIG. 3 is a flowchart for selecting a scheduled start machine. When the amount of compressed air used at the supply destination increases and the total no-load virtual capacity becomes smaller than the startup virtual capacity set value (step S11), an activation signal is acquired (step S12).

  In addition, two large and small setting values are provided for the startup virtual capacity setting value, the startup interval time when a startup signal is obtained with a large startup virtual capacity setting value is set long (about 3 minutes), and a small startup virtual capacity setting is set By setting the activation interval time when the activation signal is obtained with a short value (about 30 seconds), a normal activation signal corresponding to a gradual decrease in the total no-load virtual capacity and a sudden total no-load virtual capacity The activation signal can be acquired separately from the emergency activation signal corresponding to the decrease.

  FIG. 4 is a flowchart of selecting a scheduled machine to be stopped. Permission to stop when the amount of compressed air used at the supply destination decreases and the total no-load virtual capacity becomes larger than the sum of the virtual capacity of the start virtual capacity setting value, stop virtual capacity setting value, and scheduled stop machine capacity A signal is acquired. The virtual capacity of the scheduled machine to stop is the maximum virtual capacity of the scheduled machine for a constant speed compressor, and the actual load virtual capacity of the scheduled machine for an inverter compressor. When the stop is determined, the stop scheduled machine is stopped after the stop signal acquisition waiting time has elapsed. When the stop is determined, a stop permission signal is issued, and after the stop signal acquisition waiting time has elapsed, the stop signal is acquired and executed.

[Acquisition of start signal and stop signal by rate setting value]
Next, a case where the start signal and the stop signal are acquired using the rate setting value will be described. In this case, a set value of the rate (%) with respect to the total operating virtual capacity is set. This rate setting value is expressed in%. Here, the “total operating virtual capacity” is an added value of the total of the maximum virtual capacity of the operating constant speed compressor and the total of the actual load virtual capacity of the operating inverter compressor. For this reason, the virtual capacity for the start signal and the virtual capacity for the stop permission signal fluctuate in proportion to the total operating virtual capacity.

A stop rate setting value or a stop rate setting value is set for this total operating virtual capacity, and a stop signal acquisition waiting time is set for the stop signal.
A virtual capacity for activation is calculated by multiplying the total operating virtual capacity by a value obtained by multiplying the set value of the percentage display stop by 1/100. The virtual capacity for activation and the total no-load virtual capacity are compared, and an activation signal is acquired when the virtual capacity for activation is larger.

  A value obtained by adding the stop rate setting value of the percentage display and the stop rate setting value and multiplying by 1/100 is calculated. This calculated value is multiplied by the virtual capacity obtained by subtracting the virtual capacity of the machine scheduled to be stopped from the total operating virtual capacity, and the virtual capacity of the machine scheduled to be stopped is added to this multiplied value to calculate the virtual capacity for stopping.

  After comparing the virtual capacity for this stop with the total no-load virtual capacity, when the virtual capacity for the stop is smaller than the total no-load virtual capacity, the stop permission signal is obtained, and after the stop signal acquisition waiting time has elapsed A stop signal is acquired.

  When the number of compressors operated is small and the rate (%) setting value is small, the total no-load virtual capacity is small, and a case where the start signal to the compressor is delayed is assumed. Further, when the number of compressors operated is large and the rate (%) set value is large, the total no-load virtual capacity becomes too large, and it is assumed that useless operation increases and contradicts energy-saving operation.

  Therefore, assuming the maximum value of the total operating virtual capacity, the ratio (%) is set for the total operating virtual capacity, and when the total operating virtual capacity is small, starting with the startup virtual capacity setting value that is not displayed as a percentage Better control can be realized by using a combination of determination of acquisition of the signal and stop signal and determination of acquisition of the start signal and stop signal based on the stop virtual capacity setting value.

  In this case, in the case of the start signal, if it is determined to acquire the start signal by either one, the start signal is acquired, and in the case of the stop signal, both are determined to acquire the stop permission signal Only when the stop signal acquisition time has elapsed, the stop signal is acquired.

  In the compressor operation control apparatus according to the present embodiment, the grouping of the inverter compressor and the constant speed compressor is set in advance. Within each group, the machine that is scheduled to start and the machine that is scheduled to stop are rotated. The number of rotations is set in advance by the operator.

  In addition, when there are compressors with different capacities, if necessary, the large-capacity machine group, medium-capacity machine group, and small-capacity machine group can be divided into multiple large and small capacity groups within the group. It is good to turn the machine and the machine scheduled to stop. When starting the standby compressor, the small capacity compressor is preferentially started. When stopping the compressor in operation, the small capacity compressor is preferentially stopped. Thereby, energy saving can be achieved.

  Next, in the compressor operation control device 10, when the total no-load virtual capacity decreases and the start signal is acquired, when there are start-up machines in both the inverter compressor group and the constant speed compressor group, A description will be given of which group's next scheduled startup machine is selected as the startup designation machine.

Immediately after the start signal is generated, the inverter compressor and the constant speed compressor are almost fully loaded, leaving the total no-load virtual capacity of the start virtual capacity set value.
Assuming that the next scheduled startup machine is the startup compressor of the inverter compressor group, and considering the effect on the supply pressure when starting the compressor, many of the maximum virtual capacities of the inverter compressor are considered. 70 to 90% of the portion is a pressure adjusting function portion of the compressor and does not affect the supply pressure.

  When operating the constant speed compressor with the discharge pressure of the inverter compressor set below the standard maintenance pressure of the constant speed compressor and operating the inverter compressor, the constant speed compressor operates at full load. become. Here, the “standard maintenance pressure” of the constant speed compressor is the discharge pressure specified by the manufacturer adjusted so that the motor load becomes the rated value.

The remaining fixed virtual capacity (virtual capacity equal to or lower than the lower limit air volume) 30 to 10% is the virtual capacity that causes the excessive air volume. This excess air volume is absorbed by reducing the load operation of the inverter compressor that is operating at a virtual capacity close to the full load.
Here, the case of starting the inverter compressor having a large fixed virtual capacity and the constant speed compressor having the maximum virtual capacity smaller than the fixed virtual capacity of the inverter compressor are not considered because they are rare cases.

  Since the compressor operation control apparatus 10 according to the present embodiment targets an inverter compressor and a constant speed compressor in a common-sense equipment state, any inverter compressor can be started at any time.

  On the other hand, in the constant speed compressor group, when the constant speed compressor group is designated as the next scheduled start machine and the constant speed compressor of the scheduled start machine starts, the maximum virtual capacity of the constant speed compressor Consider the presence or absence of pressure increase due to excessive air flow and the total pressure adjustment virtual capacity required when the constant speed compressor stops. Here, “total pressure adjustment virtual capacity” is “maximum virtual capacity of inverter type compressor (maximum load factor virtual capacity) −minimum virtual capacity (minimum load factor virtual capacity) = pressure adjustment virtual capacity”. The sum of the individual pressure adjustment virtual capacities when a plurality of inverter type compressors are operating.

  Immediately after the start signal is generated, the inverter compressor and the constant speed compressor are almost fully loaded with a total no-load virtual capacity corresponding to the start virtual capacity set value. This condition is the same as when the inverter compressor is started.

  At this time, if the constant speed compressor scheduled to start is started, almost the entire amount of the maximum virtual capacity of the constant speed compressor temporarily becomes the surplus air volume. This surplus air volume must be absorbed by the total pressure adjustment virtual capacity of the operating inverter compressor (s).

At this time, the required total pressure adjustment virtual capacity of the operating inverter compressor is the sum of the starting virtual capacity setting value and the maximum virtual capacity of the started constant speed compressor.
After that, when the constant speed compressor is stopped, the required total pressure adjustment virtual capacity of the inverter compressor required for the stop calculation is the sum of the maximum virtual capacity, start virtual capacity, and stop virtual capacity of the constant speed compressor. It is.

  As described above, if the required total pressure adjustment virtual capacity for starting signal acquisition and stop signal acquisition is compared, the total pressure adjustment virtual capacity having a larger value at the stop virtual capacity set value than at the start time is required.

  Therefore, in the present invention, before the constant-speed compressor is started, a temporary stop calculation is performed when the constant-speed compressor of the scheduled start-up machine is started by the total pressure adjustment virtual capacity of the currently operating inverter compressor. To determine whether the constant speed compressor can be stopped. When the result of the determination is that the stop is possible, the constant speed compressor is set as the activation designated machine. On the other hand, when the total pressure adjustment virtual capacity is insufficient and the judgment result is “stop”, the start-up machine of the inverter compressor group is set as the start-up designated machine.

[Select a startup group when the start and stop settings are virtual capacity]
As shown in step S13 of FIG. 3, the total value of the maximum virtual capacity, the start virtual capacity setting value, and the stop virtual capacity setting value of the scheduled start machine of the constant speed compressor group is calculated. On the other hand, the total of the total pressure adjustment virtual capacity of the operating inverter compressor is calculated.

  Here, the sum of the maximum virtual capacity, start virtual capacity setting value, and stop virtual capacity setting value of the scheduled start machine of the constant speed compressor group (hereinafter referred to as the first total value) of the inverter compressor that is operating When the total pressure adjustment virtual capacity, which is the total of the individual pressure adjustment virtual capacity, is smaller than the value, the scheduled start machine of the constant speed compressor is set as the activation designated machine (step S14).

  When the first total value is equal to or greater than the total pressure adjustment virtual capacity, the start-up machine for the inverter compressor is set as the start designated machine (step S15). When the first total value is equal to the value of the total pressure adjustment virtual capacity, either the constant speed compressor or the inverter compressor may be specified to start, but in this embodiment, it is possible to confirm the stop reliably. Inverter compressor was selected.

[Selecting a stop group when the start and stop settings are virtual capacity]
As shown in steps S21 to S26 in FIG. 4, when the total no-load virtual capacity increases and a stop permission signal is obtained, and there are scheduled stop machines in both the inverter compressor group and the constant speed compressor group. Then, which group's scheduled stop machine will be the next scheduled stop machine will be explained.

Under conditions where a stop permission signal is generated, the inverter compressor is operating at a light load, and the constant speed compressor is operating at a rated or lower rated discharge pressure. It is assumed that
At this time, the inverter compressor has a light load and a small operating virtual capacity (actual load virtual capacity), and can be easily stopped as compared with a constant speed compressor operating at full load.

  However, it is necessary to consider the case where the inverter compressor scheduled to stop with a large fixed virtual capacity and the constant speed compressor with the maximum virtual capacity smaller than the fixed virtual capacity of the inverter compressor are scheduled to stop. It is rare and not considered here.

  In the present embodiment, it can be said that any inverter compressor can be stopped at any time for inverter compressors and constant speed compressors in common-sense equipment states. In the present embodiment, the scheduled stop machine is selected by determining whether or not the constant speed compressor that requires more total pressure adjustment virtual capacity for stopping is determined.

For the determination, first, the compressor having the largest virtual capacity among the constant speed compressors in operation using the total pressure adjustment virtual capacity of the inverter compressor in operation excluding the inverter compressor scheduled to be stopped is used. Determine whether or not to stop.
When the constant speed compressor can be stopped, the scheduled stop machine of the inverter compressor is set as the next stop designated machine. In addition, when the constant speed compressor is not to be stopped, the scheduled stop machine of the constant speed compressor is set as the next stop designated machine.

[Selecting a stop group when the start and stop settings depend on virtual capacity]
Calculate the total pressure-adjusted virtual capacity of the operating inverter compressor, excluding the inverter compressor scheduled to stop, and calculate the maximum virtual capacity of the compressor with the largest maximum virtual capacity among the operating constant speed compressors. The total value of the start virtual capacity setting value and the stop virtual capacity setting value (hereinafter referred to as the second total value) is calculated.

  When the second total value is smaller than the total pressure adjustment virtual capacity, it is possible to stop the compressor having the largest maximum virtual capacity, and therefore, the scheduled stop machine of the inverter compressor is set as the stop designation machine and stops (step). S28). When the second total value is equal to or larger than the total pressure adjustment virtual capacity, the compressor with the largest maximum virtual capacity is not stopped, so the scheduled stop machine of the constant speed compressor is set as the stop designated machine and stops (step) S29).

[Select startup group when start and stop settings are based on percentage]
Next, the case where the activation group is selected in the case where the rate (%) setting value is used as the setting value for starting and stopping will be described.

  A value obtained by dividing the sum of the start rate setting value and the stop rate set value by 100 is multiplied by the total operating virtual capacity to calculate a multiplied value, and the maximum value of the constant speed compressor of the scheduled starter is calculated by the multiplied value. An added value obtained by adding the virtual capacity is calculated, and the added value is compared with the total pressure adjustment virtual capacity of the inverter compressor currently in operation.

  When the added value is smaller than the total pressure adjustment virtual capacity, the start-up machine of the constant speed compressor is set as the start specification machine, and when the addition value is greater than the total pressure adjustment virtual capacity, the start-up machine of the inverter compressor is specified as the start specification machine. A machine.

  When the added value and the total pressure adjustment virtual capacity are equal, either the constant speed compressor or the inverter compressor may be designated as the activation designation machine, but in the present embodiment, the stop can be surely confirmed. The inverter compressor was designated as the starter.

[Selecting a stop group when the start and stop settings are based on percentages]
Next, a case where a stop group is selected when a rate (%) set value is used as a set value for starting and stopping will be described.

A division value is calculated by dividing the sum of the start rate setting value and the stop rate setting value by 100.
The third total value obtained by adding the total value of the maximum virtual capacity excluding the maximum virtual capacity of the compressor having the largest maximum virtual capacity in the constant speed compressor in operation and the total actual load virtual capacity of the inverter compressor in operation Multiply the division value to calculate the multiplication value, calculate the addition value α of the multiplication value and the maximum virtual capacity of the compressor having the largest maximum virtual capacity at the constant speed compressor in operation, and operate with the addition value α The total pressure adjustment virtual capacity value β of the inverter compressors other than the inverter compressor scheduled to be stopped is compared.

  When α is smaller than β, the stop scheduled machine of the inverter compressor is set as the stop designated machine. When α is equal to or greater than β, the scheduled stop machine of the constant speed compressor is set as the stop designated machine. When α = β, either the constant speed compressor or the inverter compressor may be designated to stop, but in this embodiment, the constant speed compressor that can surely confirm the stop is selected as the stop designation machine.

[Select startup group when virtual capacity setting value and rate (%) setting value are used together for start and stop setting values]
When two types of setting values, the setting value based on the virtual capacity and the setting value based on the rate (%), are used together so that the start signal and the stop signal can be acquired, the setting value based on the virtual capacity and the rate (%) Selection of a start designated machine and a stop designated machine different from the set value may occur.

  In this case, the starter is specified as long as the results obtained by the two settings are the same. In addition, when at least one of them designates an inverter compressor start-up machine, the inverter compressor is set as the start-up machine.

  In addition, regarding the designation of the stop device, if the result obtained by the two settings is the same, it is assumed to be designated. Further, when at least one of the inverter compressors is designated to stop, the scheduled stop machine of the inverter compressor is set as the stop designated machine.

  In addition, when obtaining the virtual capacity of other compressors that exceeds the pressure adjustment virtual capacity of the reference compressor, operate multiple inverter compressors of the inverter compressor and the reference compressor that have already been measured. The pressure adjustment virtual capacity of a plurality of compressors is measured as the pressure adjustment virtual capacity of the reference compressor.

  The embodiments of the present invention have been described above with reference to the drawings. However, the specific configuration is not limited to the above-described embodiments, and the present invention can be changed or added without departing from the scope of the present invention. Included in the invention.

Hereinafter, the compressor operation control implemented using the compressor operation control apparatus which concerns on this Embodiment is described.
[100] Compressor used in the example 1.1 Unit 75 kW inverter type compressor 1 unit 2.2 Unit 75 kW constant speed type (with oil) compressor 1 unit 3.3 unit 55 kW constant speed type (with oil) compressor 1 unit 4 Unit 4 37 kW inverter type compressor 1 unit 5.5 Unit 37 kW constant speed (with oil) compressor 1 unit
All of these compressors have a rated discharge pressure of 0.69 MPa.
Wiring necessary for control is connected to the compressor operation control device.

The configuration of the embodiment is shown in FIG.
[101] An optimum operation number control device (hereinafter abbreviated as a compressor operation control device) of an inverter type compressor and a constant speed type compressor is composed of a programmable controller and a touch panel.
The following programs are built in the programmable controller.
Setting of control conditions and display of operation status are performed by a touch panel.
Predetermined wiring is provided between the compressor operation control device and each compressor.

1. Unit control program,
(1) Start-up program (2) Stop program (3) Optimization program for controlling the number of inverter-type and constant-speed compressors operated (4) Inverter-type and constant-speed compressor groups and compressor capacity within the group Separate grouping program (5) Program to select start-up scheduled machine and scheduled shutdown machine from small capacity machine or small capacity machine group (6) Initial operation program

2. Control condition setting program (1) Selection of virtual capacity unit (2) Selection of compressor model and reference machine (3) Selection of measurement method for each compressor and setting of virtual capacity (4) Setting for start signal (5) Setting for stop signal, setting of stop signal acquisition time (6) Specification of large, medium and small capacity of compressor (7) Setting of inching time (8) Setting of initial operation time (9) Selection of compressor operation (continuous, automatic, Off)
(10) Compressor operation control device operation switch (ON / OFF)
As the start signal and the stop signal, the virtual capacity set value and the rate (%) set value are used together.

[102] Setting to compressor operation control device [102-1] Selection of virtual capacity type Initial setting 1 Rate virtual capacity, electric virtual capacity, air volume virtual capacity on "system control unit selection" screen shown in FIG. The electrical virtual capacity was selected.

[102-2] Selection of Compressor Model and Standard Machine Initial Setting 2 The following was selected and set on the “Select Compressor Model and Standard Machine” screen shown in FIG.
When the reference compressor is selected, the other units display “No”.
Unit 1 75 kW inverter type compressor (inv) Standard compressor selected to be adopted Unit 2 75 kW constant speed type compressor (normal) Standard compressor indicates NO 3 Unit 55 kW constant speed type compressor (normal) Standard compressor indicates NO 4 Unit 37 kW Inverter type compressor (inv) No standard compressor is displayed No. 5 Unit 37kW constant speed type compressor (normal) No standard compressor is displayed

[102-3] Setting of Electric Virtual Capacity by Compressor Operation “Selection of Compressor Measurement Method and Setting of Virtual Capacity by Operation” in [102-3-2] to [102-3-6] This is done on a business day holiday with no fluctuations in usage.
In the embodiment, the virtual capacity of the reference compressor is made first, and the virtual capacity of another compressor with respect to the virtual capacity is obtained.

[102-3-1] Explanation of Setting Screen (1) (Initial Setting 3-1 to 5 Screen) (FIGS. 8 to 12) Explanation of “Selecting Measurement Method of Unit No. Compressor and Setting of Virtual Capacity by Operation” Screen I do.
(2) “Model selection display” displays inv (inverter type compressor) or normal (constant speed type compressor) selected on the initial setting 2 “selection of compressor type and reference machine” screen.

(3) “Selection display of reference compressor” indicates the adoption selected in the initial setting 2 “Selection of compressor type and reference machine” screen.
(4) “Selection of measurement method” for * 1 in the screen (hereinafter, the symbol marked with * indicates the symbol in the screen) selects only the inverter type compressor.
The initial setting 2 “Select compressor type and reference machine” screen displays “No” for compressors for which the constant speed compressor is selected.

(5) In “Measured value setting” in * 2, write the value displayed in * 3 when “At maximum air flow” or “At minimum air flow”.
(6) * 3 indicates the current measured value.
(7) * 4 displays the sum of multiplication values of * 7 and * 3 for the inverter type compressor in operation.
(In the embodiment, the total operating virtual capacity is abbreviated as operating virtual capacity.)

(8) When * 5 is pressed in * 4, "Total of operating virtual capacity of inverter type compressor" is displayed when * 4 is pressed.
(9) In * 6, * 5 is fixed when "Memory 2" is pressed when "Sum of virtual capacity of inverter type compressor when inverter type compressor and measured compressor are operated in parallel" in * 5 After that, when "Calculate" is pressed, the subtracted value from * 4 to * 5 is displayed in * 6.

(10) * 7 writes the virtual capacity displayed in * 6.
(11) Units in “display current value” and “set maximum virtual capacity” are kW from the electric virtual capacity selected by the initial setting 1 “system control unit selection” screen.

[102-3-2] Setting of virtual electric capacity of Unit 1 75 kW inverter type compressor (1) Calling “Selection of measuring method of Unit 1 compressor and setting of virtual capacity by operation” screen. (Initial setting 3-1 screen) (Fig. 8)
(2) Inv (inverter type compressor) is displayed in the “model selection display”.

(3) “Adoption” is displayed in “reference compressor selection display”.
(4) * 1 “Measurement method selection” selected the load factor (sent from the compressor).
(5) Since the standard compressor has selected the electric virtual capacity in the initial setting 1 in the “setting of the maximum virtual capacity” of * 7, 75 of the catalog value of 75 kW of shaft power is written.

(6) The discharge pressure of 0.57 MPa sent to the office was set in the reference compressor.
(7) The reference compressor was started, and the compressed air load was adjusted to operate at the maximum discharge air volume.
At that time, 100 was displayed in “Display of current measured value” of * 3.
100 was recorded at “maximum air volume” of * 2. At this time, 75 was displayed in * 4.
Next, the load of compressed air was adjusted and it was made to operate at the minimum load.
At that time, 10 was displayed in “Display of current measurement value” of * 3.
10 was recorded in “Minimum air flow” of * 2. At this time, 7.5 is displayed in * 4.

(8) The measurement and recording of the reference compressor ends.
(9) With this reference compressor, 75 kW when the load factor of the measured value is 100%.
(10) The pressure adjustment electric virtual capacity of the reference inverter type compressor is 67.5 kW obtained by subtracting the minimum electric virtual capacity from the maximum electric virtual capacity.

The formula is shown below.
Measurement of a measured compressor with a maximum virtual capacity of 67.5 kW can be performed using only the reference compressor.

[102-3-3] Setting of electric virtual capacity of Unit 3 55 kW constant speed type compressor Unit 2 75 kW constant speed type compressor lacks the pressure adjustment electric virtual capacity of the reference compressor. Set from electrical virtual capacity.

(1) Call the “Select the measurement method for Unit 3 compressor and set the virtual capacity by operation” screen. (Initial setting 3-3 screen) (FIG. 10)
(2) “Model selection display” displays normal (constant speed compressor).
(3) “No” is displayed in “reference compressor selection display”.

(4) “No” is selected and displayed in “Selection of measurement method” in * 1.
(5) Adjust the compressed air load to increase the virtual electric capacity of the reference compressor,
* Increase the “total operating virtual capacity of the inverter type compressor” in 4 to a capacity that can sufficiently accommodate the electric virtual capacity of 55.0 kW of the No. 3 55 kW constant speed compressor.
In the example, the “total of virtual operating capacity of the inverter type compressor” of * 4 was set to 70.0 kW.
Press Record 1 and record (fix) * 4 “Total Inverter Compressor Operation Virtual Capacity” at 70.0 kW.
By pressing record 1, "total inverter operating compressor capacity" is programmed to be displayed in * 4.

(6) The No. 3 55 kW constant speed compressor was started and operated in parallel with the reference compressor.
* 5 “Total of the virtual operating capacity of the inverter type compressor when the inverter type compressor and the compressor under test were operated in parallel” was 17.1 kW, and was recorded (fixed) by pressing Record 2.

(7) By pressing the calculation, a subtraction value of 52.9 kW from * 4 to * 5 was obtained as * 6.
* 52.9 is written in 7
The maximum electric virtual capacity of the No. 3 55 kW constant speed compressor is calculated as 52.9 kW.
(8) The reset value was pressed to cancel the stored value and the calculated value.
(8) There is no other measurement because it is a constant speed compressor.

[102-3-4] Setting of electric virtual capacity of Unit 5 37 kW constant speed compressor (1) Calling “Selection of measurement method of Unit 5 compressor and setting of virtual capacity by operation” screen. (Initial setting 3-5 screen) (FIG. 12)
(2) “Model selection display” displays normal (constant speed compressor).

(3) “No” is displayed in “reference compressor selection display”.
(4) “No” is selected and displayed in “Selection of measurement method” in * 1.
(5) * 4 “Total of virtual operating capacity of inverter type compressor” of the reference compressor was 70.0 kW.
Record 1 was pressed to record (fix) a total operating virtual capacity of 70.0 kW.

(6) The No. 5 37 kW constant speed compressor was started and operated in parallel with the reference compressor.
* 5 “Total of the virtual operating capacity of the inverter type compressor when the inverter type compressor and the compressor under test were operated in parallel” was 33.2 kW, and it was recorded (fixed) by pressing Record 2.
(7) By pressing the calculation, a subtraction value of 36.8 kW from * 4 to * 5 was obtained as * 6.
* 36.8 was written in 7
The maximum electric virtual capacity of Unit 5 is calculated at 36.8 kW.

(8) The reset value was pressed to cancel the stored value and the calculated value.
(9) There is no other measurement because it is a constant speed compressor.

[102-3-5] Electric virtual capacity setting of No. 4 unit 37 kW inverter type compressor (1) Call up the “Selection of measuring method of No. 4 compressor and setting virtual capacity by operation” screen. (Initial setting 3-4 screen) (FIG. 11)
(2) Inv (inverter type compressor) is displayed in the “model selection display”.

(3) “No” is displayed in “reference compressor selection display”.
(4) “Selection of measurement method” selected a load factor.
(5) * 4 “Total of virtual operating capacity of inverter type compressor” was 70.0 kW.
Record 1 was pressed to record (fix) a total operating virtual capacity of 70.0 kW.

(6) A discharge pressure of 0.57 MPa for sending the No. 4 37 kW inverter type compressor to the office was set and operated with the maximum air flow.
At that time, 105 is displayed in “Display of current measured value” of * 3.
105 was recorded at “maximum air volume” of * 2.
At that time, * 5 “Total of the virtual operating capacity of the inverter type compressor when the inverter type compressor and the compressor under measurement were operated in parallel” was 31.9 kW, and recording 2 was recorded (fixed).

(7) Pressing the calculation gave a subtraction value of 38.1 kW from * 4 to * 5.
* 7 38.1 was written in “Maximum virtual capacity setting”.
The maximum virtual capacity of the No. 4 machine 37 kW inverter type compressor is calculated as 38.1 kW.

(8) Next, the load of compressed air was adjusted and it was made to operate with the minimum air volume.
At that time, 10 was displayed in “Display of current measurement value” of * 3.
10 was recorded in “Minimum air flow” of * 2.
(9) The reset value was pressed to cancel the stored value and the calculated value.

(10) The pressure adjustment electric virtual capacity of the No. 4 inverter type compressor is 34.48 kW.
The formula is shown below.
Inverter-type compressors include a model with an increased air flow rate, and the maximum air flow exceeds 100% when the operation is reduced.

[102-3-6] Setting of electric virtual capacity of Unit 2 75 kW constant speed compressor (1) Calling “Selection of measurement method of Unit 2 compressor and setting of virtual capacity by operation” screen. (Initial setting 3-2 screen) (FIG. 9)
(2) “Model selection display” displays normal (constant speed compressor).

(3) “No” is displayed in “reference compressor selection display”.
(4) “No” is selected and displayed in “Selection of measurement method” in * 1.

(5) The maximum electric virtual capacity of Unit 2 constant speed compressor is set by operating inverters No. 1 and No. 4 and adjusting the load of compressed air. The “total capacity” was 95.0 kW.
Press Record 1 and record (fix) 95.0 kW of “Total Inverter Compressor Operational Capacity” * 4.
(6) The No. 2 75 kW constant speed compressor was started and operated in parallel with the inverter compressor.
* 5 “Total of the virtual operating capacity of the inverter type compressor when the inverter type compressor and the compressor under test were operated in parallel” was 16.6 kW, and it was recorded (fixed) by pressing Record 2.

(7) By pressing the calculation, the subtraction value from * 4 to * 5 was obtained as 73.4 kW to * 6.
* 78.4 is written in 7
The maximum electric virtual capacity of Unit 2 is calculated at 78.4 kW.
(8) The reset value was pressed to cancel the stored value and the calculated value.
(9) There is no other measurement because it is a constant speed compressor.

[102-4] Compressor large / medium / small capacity setting and large / small switching control setting The initial setting 4-1 “Compressor large / medium / small capacity setting and large / small switching control setting” screen (FIG. 13) is displayed.
The following settings are made with reference to the explanation screen (FIG. 14) of the initial setting screen 4-2.
(1) Model and characteristic display The contents set in the initial screen 2 and the initial screens 3-1 to 5 are displayed.
(2) Compressor capacity selection Unit 1 Large capacity unit Unit 2 Large capacity unit Unit 3 Medium capacity unit Unit 4 Small capacity unit Unit 5 Small capacity unit

[102-5-1] Setting of start signal The following was set in the “start signal setting” screen of initial setting 5.
(1) Virtual capacity setting 10kW
(2) Rate setting 6%

[102-6] Stop signal setting The following settings were made on the “stop signal setting” screen of the initial setting 6.
(1) Virtual capacity setting 10 kW
(2) Rate setting 6%
(3) Stop signal acquisition time setting 180 seconds

[102-7] Unit-specific control characteristics setting The following settings were made on the “Inching time setting” screen of initial setting 7.
15 min for both Units 1 to 5 The inching time is the time when the compressor is automatically started and is always operated when it is not manually stopped or the system is stopped due to the end of operation.

[102-8] Initial operation and system settings The following settings were made on the initial setting 8 "Initial operation and system settings" screen.
(1) Initial operation time 10 minutes (2) Initial operation number 2 units (3) Select “Adopt” operation from large capacity machine only for inverter type compressor

[102-9] Setting of compressor operation selection The “compressor operation selection” screen includes continuous, automatic, and off.
All automatic units 1 to 5 were selected.

[103] Pressure adjustment of the compressor [103-1] Pressure setting for the inverter type compressor The pressure setting value for the inverter type compressor is set to 0.57 MPa, and the compressed air is controlled by the compressor operation control device according to the embodiment of the present invention. The supply pressure to the office by the supply device was 0.57 MPa.
[103-2] Description of discharge pressure adjustment function of constant speed type compressor The constant speed type compressor is used with standard maintenance (discharge pressure at maximum air flow is 0.69 MPa). In addition, as described in paragraph 0064 in the description relating to the embodiment, the constant speed type compressor is operated in a state where the discharge pressure of the inverter type compressor is set below the standard maintenance pressure of the constant speed type compressor and the inverter type compressor is operated. When the compressor is operated, the constant speed compressor is operated at full load.

[104] Operation of compressor operation control apparatus Total operation maximum electric virtual capacity (total maximum electric virtual capacity of operating compressor) and total operation electric virtual capacity (electrical virtual capacity of operating compressor) of the embodiment The transition of the total) and the contents of the control are shown in FIGS.
Since the numerical value of the arithmetic expression described here is not known to a detailed numerical value in actual operation, it expresses the value calculated backward based on the contents of the embodiment.

[104-1] Initial operation 7:45 The initial operation is referred to as initial filling. In preparation for the start of operation, the tank and piping are filled with compressed air.
The initial operation of the embodiment is the above-mentioned 102-8] Initial operation and system setting (1) Initial operation time 10 minutes (2) Initial operation number 2 (3) Initial operation completion pressure 0.55 MPa
(4) Only inverter type compressors are set to operate from large capacity machines.

In the inverter type compressor group, the first scheduled start-up machine for the initial operation was the first 75 kW compressor.
The constant speed compressor group was the No. 5 37 kW compressor.
As for which start-up signal is issued to which start-up machine, the first 75 kW inverter-type compressor was selected according to the program for optimizing the number of inverter-type compressors and constant speed-type compressors.

The content of the calculation is shown in [104-1-1] below. The calculation describes only the selected expression.
At 7:45, the operation switch of the “compressor operation control device operation switch” screen was turned on.
Unit 1 75kW inverter type compressor started.
The next scheduled start-up machine was the No. 4 37 kW compressor in the inverter type compressor group.
In the constant speed compressor group, it was No. 5 Unit 37 kW compressor.
The 5th 37 kW constant speed compressor was selected by the program for optimizing the number of inverter type compressors and constant speed type compressors as the start signal to be issued.

The content of the calculation is shown in [104-1-2] below.
Following the start of Unit 1, the Unit 5 37 kW constant speed compressor was started.
Initial operation startup is complete.
The main pressure became 0.55 MPa at 7:53, and the initial operation was completed.
Ready for operation.
The total of the maximum operating electric virtual capacity during the initial filling was 111.8 kW, and the total operating electric virtual capacity after the completion of the initial filling was 75 kW.

[104-1-1] Contents of the calculation in which the No. 1 75 kW inverter type compressor is designated as the start-up machine in the initial operation (1) -1 Start-up group selection calculation when the start-up setting value is based on virtual capacity is formulated.

Substitute numerical values into the above formula.
As a result of the calculation, the planned starter of the inverter type compressor group was selected as the starter.

(1) -2 The activation group selection calculation when the activation setting value is based on the rate (%) is formulated.

Substitute numerical values into the above formula.
As a result of the calculation, the planned starter of the inverter type compressor group was selected as the starter.

[104-1-2] Calculation in which the No. 5 37 kW constant speed compressor is designated as the second activation designation machine in the initial operation (1) -1 Activation group selection calculation when the activation setting value is based on virtual capacity Formulate.

Substitute numerical values into the above formula.
As a result of the calculation, the scheduled starter of the constant speed compressor group was selected as the starter.

(1) -2 Formulating the selection calculation of the activation group when the activation setting value is based on the rate (%).

Substitute numerical values into the above formula.
As a result of the calculation, the scheduled starter of the constant speed compressor group was selected as the starter.

[104-2] Start of operation 8:00: After completion of the initial operation, the start signal and stop signal programs (compressor operation number control program) operate.
After completion of the initial operation, it is designated to start or stop from the small capacity machine or the small capacity machine group.
The operation designation from the large capacity machine during the initial operation is handled as a known technique although it is not in the literature.
Even after the start of operation, the amount of air used does not increase immediately after the meeting of operations, preparation of materials, preparation of work, etc.

[104-3] Additional activation 8:10 Since the total operating electric virtual capacity exceeded 101.801 kW at 8:10, the No. 4 37 kW inverter type compressor was activated.
[104-3-1] and [104-3-2] show the calculation contents that led to the activation.

[104-3-1] Background of the start of the No. 4 machine 37 kW inverter type compressor In the compressor operation control device, the following five calculations were performed.
1. Planned start-up machine by start-up from small capacity machine In the inverter type compressor group, No. 4 37kW compressor was the start-up machine.
In the constant speed compressor group, the No. 3 55kW compressor was scheduled to start.

2. As a result of the calculation of the program for optimizing the number of inverter-type and constant-speed compressors in operation, the No. 4 37 kW inverter-type compressor was designated as the next scheduled start-up machine.
The contents of the calculation are shown in [104-3-2-1-2].
As a result of the calculation, the inverter type compressor group was selected for the calculation based on the virtual capacity setting value and the rate (%) setting value.

3. Activation by electric virtual capacity set value An activation signal was obtained with a total unloaded electric virtual capacity of 9.999 kW when the total operating electric virtual capacity was 101.801 kW.
The content of the calculation is shown in [104-3-3-1].

4). Start-up calculation by rate setting value A start-up signal was obtained with a total unloaded electric virtual capacity of 6.327 kW when the total operating electric virtual capacity was 105.473 kW.
The content of the calculation is shown in [104-3-3-3].

5. Combined start-up calculation based on electric virtual capacity and start-up calculation based on rate setting value The start-up signal obtained from the two set values of the set value based on electric virtual capacity and the set value based on rate (%) gets the start-up signal first. By adopting the signal, it was activated by the activation signal according to the set value of the electric virtual capacity.

[104-3-2] Calculation formula of program for optimizing the number of operating inverter type compressors and constant speed type compressors [104-3-2-1] Start group selection calculation when start setting value is based on virtual capacity Formulate.

Substitute numerical values into the above formula.
As a result of the calculation, the planned starter of the inverter type compressor group was selected as the starter.

[104-3-2-2] The activation group selection calculation when the activation setting value is based on the rate (%) is formulated.

Substitute numerical values into the above formula.
As a result of the calculation, the planned starter of the inverter type compressor group was selected as the starter.

[104-3-3-1] Startup setting value is startup signal calculation by virtual capacity

Substitute numerical values into the above formula.
In the electric virtual capacity setting value, the activation signal was acquired when the no-load electric virtual capacity was 9.999 kW.
The operating virtual capacity at this time was 101.801 kW.

[104-3-3-2] The activation setting value formulates the activation signal calculation based on the rate (%).

Substitute numerical values into the above formula.
In the activation rate setting value, an activation signal was obtained when the total no-load electric virtual capacity was 6.327 kW.
The total operating virtual capacity at this time was 105.473 kW.

[104-3] Additional start-up 8:22 After that, at 8:22 am, the No. 3 55 kW constant speed compressor was started.
In the calculation of the program for optimizing the number of inverter-type compressors and constant-speed compressors that were operated, there was no planned start-up of the inverter-type compressor, so the constant-speed compressor was selected.

The activation signal at this time was obtained by acquiring the activation signal with the activation setting value based on the electric virtual capacity setting.
The total operating electric virtual capacity at this time was 139.901 kW, and the total no-load electric virtual capacity was 9.999 kW.
(Calculation formula is omitted)

[104-4] Additional start-up 8:35 Start of Unit 2 75 kW constant speed type compressor At 8:35 am, Unit 2 75 kW constant speed type compressor started.
The start signal was based on the start signal acquisition calculation based on the rate (%) and the start set value.
At this time, the total operating electric virtual capacity was 191.322 kW, and the total no-load electric virtual capacity was 11.478 kW.
(Calculation formula is omitted)

[104-5] Movement of total no-load electric virtual capacity immediately after starting Unit 2 75 kW constant speed compressor Most surplus electrical virtual capacity at the start of Unit 2 75 kW constant speed compressor is mostly 75 kW constant speed compressor maximum virtual capacity It becomes surplus air volume.
At this time, the total pressure adjustment virtual capacity of the inverter type compressor was 101.98 kW, and the total actual load virtual capacity of the pressure adjustment unit was 88.161 kW.

The total actual load virtual capacity of the pressure adjustment unit decreased to 20.66 kW by starting the No. 2 75 kW constant speed compressor.
A large amount of surplus air due to the start of the No. 2 75 kW constant speed compressor was absorbed by the operating inverter compressor, and the supply pressure did not increase.

  In the start-up by optimizing the number of operating inverter-type compressors and constant-speed compressors according to the present invention, the inverter-type compressor equal to or more than the total virtual capacity of the virtual capacity of starting and stopping in advance and the maximum virtual capacity of the started constant-speed compressor Since it was activated after confirming that there was a total pressure adjustment virtual capacity, there was no increase in supply pressure due to surplus electrical virtual capacity due to additional activation.

[104-6] Stop calculation after starting Unit 2 75 kW constant speed compressor Immediately after Unit 2 75 kW constant speed compressor started at 8:35, there was a total unloaded electric virtual capacity of about 80 kW, and the following three A stop operation was performed.
1. 1. Select calculation of the scheduled machine to stop by specifying the stop from the small capacity machine. 2. Calculation of the optimization method for controlling the number of inverter-type and constant-speed compressors. Stop calculation

The result of the calculation was as follows.
(1) No. 5 37 kW constant speed compressor became the scheduled stoppage in the calculation of the stop designation from the small capacity machine and the method of optimizing the operation number control of the inverter type compressor and the constant speed type compressor.
The content of the calculation is shown in [104-6-2-1-2].
(2) It was possible to stop in the stop calculation of the scheduled stop machine in (1).
The contents of the calculation are shown in [104-6-3-1-2].

  From the above calculation result, a stop signal was obtained at 8:38, and the No. 5 37 kW constant speed compressor stopped.

[104-6-1] Inverter type compressor and constant speed type compressor scheduled to stop At this time, after the inching prevention time has passed,
(1) Unit 1 75 kW inverter type compressor (2) Unit 3 55 kW constant speed compressor (3) Unit 5 37 kW constant speed type compressor

The planned stoppage of the inverter type compressor group is No. 1 75kW compressor.
The scheduled stop machine of the constant speed compressor group is the No. 5 37kW compressor.
The constant speed compressor group was designated by the calculation of the program for optimizing the operation number control of the inverter type compressor and the constant speed type compressor, and the No. 5 37kW constant speed type compressor became the stop designation machine.
The calculation contents are shown in [104-6-2-1 to 2].

[104-6-2] Calculation of method for optimizing operation number control of inverter type compressor and constant speed type compressor [104-6-2-1] Stop group selection calculation based on virtual capacity for start set value and stop set value Is formulated.

A predetermined numerical value is substituted below the above formula.
As a result of the calculation, the scheduled stop machine of the constant speed compressor group was selected as the stop designated machine.

[104-6-2-2] The stop group selection calculation based on the rate (%) of the start set value and the stop set value is formulated.

A predetermined numerical value is substituted below the above formula.
As a result of the calculation, the scheduled stop machine for the constant speed compressor was selected to stop.

[104-6-3] Stop Calculation of Unit 5 37 kW Constant Speed Compressor [104-6-3-1] Formulation of Stop Calculation of Unit 5 37 kW Constant Speed Compressor by Virtual Capacity Setting Value.

A predetermined numerical value is substituted below the above formula.
The result of this stop calculation can be stopped.

[104-6-3-2] Stop calculation of the No. 5 37 kW constant speed compressor by the rate (%) set value is formulated.

A predetermined numerical value is substituted below the above formula.
The result of this stop calculation can be stopped.

After that, at 9:00 am, the Unit 5 37kW constant speed compressor was started.
[104-7] Rest time from 10:00 to 10:10 It was the morning break time, the demand for compressed air decreased, and a stop calculation was performed.
The stop designation machine is a No. 5 machine 37 kW constant speed type compressor.
At around 10:01, stop permission was first obtained according to the virtual capacity set value, then stop permission was obtained according to the rate set value, and the stop was reached at about 10: 4 after 3 minutes after the stop signal acquisition waiting time.

The conditions when the stop was reached were as follows.
Total operating electricity virtual capacity 217.692kW
Total no-load electric virtual capacity 58.508kW
The driving electricity virtual capacity during the break time decreased to 190 kW.
The other compressors did not decrease until they stopped.
The content of the calculation is the same as the previous [104-6].

[104-8] Start after 10:20 break time After the break time, the demand for compressed air increases, and as the next scheduled start machine, the scheduled start machine and scheduled stop machine are from small capacity machines or from small capacity groups. The No. 5 37 kW constant speed compressor was selected based on the selection method and the optimization of the control of the number of operating inverter-type and constant-speed compressors.

At around 10:20, the activation was based on the acquisition of the activation signal based on the rate setting value.
The starting conditions were as follows.
Total operating electricity virtual capacity 225.850 kW
Total no-load electric virtual capacity 13.550 kW

[104-9] After 10:20 Thereafter, the total operating electric virtual capacity increased to 253 kW.
[104-10] After that, there was a start and stop as shown in the figure, and at 15:10, the “compressor operation control device operation switch” was turned off and the operation was completed.

  The present invention includes a plurality of inverter-type compressors that generate compressed air by changing the rotation speed by an inverter and a constant-speed compressor that generates compressed air at a constant rotation speed, and the plurality of compressors are arranged in parallel. Compressor operation control device that controls and controls the plurality of compressors of the compressed air supply device that consolidates and collects the compressed air generated by operation and supplies the compressed air to a supply destination such as a factory or business office while maintaining a constant supply pressure However, it can also be used in a system for conducting experiments and tests that are smaller in scale than the supply of compressed air to factories and business establishments.

DESCRIPTION OF SYMBOLS 1 ... Compressed air supply apparatus 10 ... Compressor operation control apparatus 20 ... Multiple inverter compressors 30 ... Multiple constant speed compressors 40 ... Compressed air piping 50 ... Air tank 210 ... Inverter compressor 211 ... Inverter compressor 220 ... inverter compressor 230 ... inverter compressor 310 ... constant speed compressor 320 ... constant speed compressor 330 ... constant speed compressor 331 ... constant speed compressor

Claims (7)

A plurality of inverter compressors that generate compressed air by changing the number of revolutions by an inverter and a constant speed compressor that generates compressed air at a constant number of revolutions. In the compressor operation control device for controlling the operation of the plurality of compressors of the compressed air supply device that joins the compressed air and keeps the supply pressure constant and supplies it to the supply destination.
A predetermined one of the inverter compressors is set as a reference compressor, the ratio of the discharge air amount of each of the other compressors to the discharge air amount of the reference compressor is set as the virtual capacity of each compressor, and the virtual capacity is used. And controlling the start and stop of the plurality of compressors. A plurality of inverter compressors that generate compressed air by changing the number of revolutions by an inverter and a constant speed compressor that generates compressed air at a constant number of revolutions. In the compressor operation control device for controlling the operation of the plurality of compressors of the compressed air supply device that joins the compressed air and keeps the supply pressure constant and supplies it to the supply destination.
A predetermined one of the inverter compressors is set as a reference compressor, and the load factor when the reference compressor is operated at the maximum air flow is the maximum load factor virtual capacity of the reference compressor,
The inverter compressor other than the reference compressor has a load factor of the reference compressor when the reference compressor is operated at a substantially maximum air flow as a first load factor, and one of the other inverter compressors is maximized. The load factor of the reference compressor when operated with the air flow is the second load factor, and the load factor of the reference compressor when one of the other inverter compressors is operated with the minimum air flow is the third load factor. ,
The value obtained by subtracting the second load factor from the first load factor is set as the maximum load factor virtual capacity of the other inverter compressor,
A value obtained by subtracting the third load factor from the first load factor is set as the minimum load factor virtual capacity of the other inverter compressor,
When the reference compressor is operated at a substantially maximum air flow, and the constant speed compressor to be compared is operated, the load factor of the reference compressor is the fourth load factor,
The value obtained by subtracting the fourth load factor from the first load factor is the maximum load factor virtual capacity of the compared constant speed compressor,
From the sum of the maximum load factor virtual capacity of the inverter compressor in operation, the subtraction value of the total of the actual load factor virtual capacity, which is the actual load factor virtual capacity of the inverter compressor in operation, is defined as the total no-load virtual capacity,
When the amount of compressed air used at the supply destination increases and the total no-load virtual capacity becomes equal to or less than a preset startup virtual capacity setting value, a startup signal is acquired,
The amount of compressed air used at the supply destination is reduced, and the total no-load virtual capacity is determined as the start virtual capacity setting value, the preset stop virtual capacity setting value, and the actual load virtual capacity of the inverter compressor scheduled to stop. And when the total no-load virtual capacity is equal to or greater than the total capacity, the start virtual capacity set value, the preset stop virtual capacity set value, and the actual load virtual capacity of the scheduled stop machine of the constant speed compressor A stop signal is acquired when the total is exceeded,
The compressor operation control apparatus, wherein start and stop of the plurality of compressors are controlled by the acquired start signal and stop signal. A plurality of inverter compressors that generate compressed air by changing the number of revolutions by an inverter and a constant speed compressor that generates compressed air at a constant number of revolutions. In the compressor operation control device for controlling the operation of the plurality of compressors of the compressed air supply device that joins the compressed air and keeps the supply pressure constant and supplies it to the supply destination.
A predetermined one of the inverter compressors is set as a reference compressor, and the load factor when the reference compressor is operated at the maximum air flow is the maximum load factor virtual capacity of the reference compressor,
The inverter compressor other than the reference compressor has a load factor of the reference compressor when the reference compressor is operated at a substantially maximum air flow as a first load factor, and one of the other inverter compressors is maximized. The load factor of the reference compressor when operated with the air flow is the second load factor, and the load factor of the reference compressor when one of the other inverter compressors is operated with the minimum air flow is the third load factor. ,
The value obtained by subtracting the second load factor from the first load factor is set as the maximum load factor virtual capacity of the other inverter compressor,
A value obtained by subtracting the third load factor from the first load factor is set as the minimum load factor virtual capacity of the other inverter compressor,
When the reference compressor is operated at a substantially maximum air flow, and the constant speed compressor to be compared is operated, the load factor of the reference compressor is the fourth load factor,
The value obtained by subtracting the fourth load factor from the first load factor is the maximum load factor virtual capacity of the compared constant speed compressor,
The sum of the maximum operating virtual capacity that is the maximum virtual capacity of the constant-speed compressor during operation and the total of the actual load virtual capacity that is the actual virtual capacity of the inverter compressor that is actually operating under load. Is the total operating virtual capacity, and if the scheduled stop machine is a constant speed compressor, the maximum virtual capacity of the scheduled stop machine is the virtual capacity of the scheduled stop machine, and if the stop scheduled machine is an inverter compressor, Use the actual load virtual capacity as the virtual capacity of the machine scheduled to be stopped.
From the sum of the maximum load factor virtual capacity of the inverter compressor in operation, the subtraction value of the total of the actual load factor virtual capacity, which is the actual load factor virtual capacity of the inverter compressor in operation, is defined as the total no-load virtual capacity,
Set the stop rate setting value and the stop rate setting value of the percentage display with respect to the total operating virtual capacity,
Multiply the total operating virtual capacity by the value obtained by multiplying the stop rate setting value by 1/100 to calculate the virtual capacity for activation,
Comparing the virtual capacity for activation and the total no-load virtual capacity, an activation signal is acquired when the virtual capacity for activation is larger,
A value obtained by adding the stop rate setting value and the stop rate setting value and multiplying by 1/100 is calculated, and the calculated value is obtained by subtracting the virtual capacity of the scheduled machine from the total operating virtual capacity. To calculate the virtual capacity for stopping by adding the virtual capacity of the scheduled stop machine to the multiplied value,
Comparing the virtual capacity for the stop and the total no-load virtual capacity, a stop signal is obtained when the virtual capacity for the stop is smaller than the total no-load virtual capacity,
The compressor operation control apparatus, wherein start and stop of the plurality of compressors are controlled by the acquired start signal and stop signal. An acquisition function for acquiring a start signal and a stop signal in the compressor operation control apparatus according to claim 2, and an acquisition function for the start signal and the stop signal in the compressor operation control apparatus according to claim 3. Prepared,
When at least one of the two start signal and stop signal acquisition functions is determined to acquire the start signal, the start signal is acquired,
A stop signal is acquired when stop signal acquisition is determined by both of the two start signal and stop signal acquisition functions,
The compressor operation control apparatus, wherein start and stop of the plurality of compressors are controlled by the acquired start signal and stop signal. Calculate the first total value that is the sum of the maximum virtual capacity, start virtual capacity setting value, and stop virtual capacity setting value of the scheduled start machine of the constant speed compressor group,
Calculate the total pressure adjustment virtual capacity that is the sum of the pressure adjustment virtual capacity of each inverter compressor in operation,
When the first total value is smaller than the value of the total pressure adjustment virtual capacity, the scheduled start machine of the constant speed compressor is set as the activation designated machine,
When the first total value is equal to or greater than the value of the total pressure adjustment virtual capacity, the starter machine of the inverter compressor is set as the starter specified machine,
The pressure adjustment virtual capacity is obtained by subtracting the minimum load ratio virtual capacity from the maximum load ratio virtual capacity of the inverter compressor, and each pressure adjustment virtual capacity of the inverter compressor in operation is excluded from the inverter compressor scheduled to be stopped. The total capacity is calculated as the total pressure adjustment virtual capacity, and is the sum of the maximum virtual capacity of the largest constant virtual capacity of the constant-speed compressor in operation, the start virtual capacity set value, and the stop virtual capacity. Calculate a second total,
When the second total value is smaller than the total pressure adjustment virtual capacity, the stop scheduled machine of the inverter compressor is set as the stop designated machine,
3. The compressor operation control device according to claim 2, wherein when the second total value is equal to or greater than the total pressure adjustment virtual capacity, the scheduled stop machine of the constant speed compressor is set as the stop designation machine. The pressure adjustment virtual capacity is obtained by subtracting the minimum load ratio virtual capacity from the maximum load ratio virtual capacity of the inverter compressor, and each pressure adjustment virtual capacity of the inverter compressor in operation, excluding the inverter compressor scheduled to be stopped Is calculated as the total pressure adjustment virtual capacity,
A value obtained by dividing the sum of the stop rate set value and the stop rate set value by 100 is multiplied by the total operating virtual capacity to calculate the multiplied value, and the multiplied value is calculated for the constant speed compressor of the scheduled starter Calculate the added value by adding the maximum virtual capacity, and compare the added value with the total pressure adjustment virtual capacity of the inverter compressor currently in operation,
When the added value obtained by adding the maximum virtual capacity is smaller than the total pressure adjustment virtual capacity, the start-up machine of the constant speed compressor is set as the start designated machine, and the added value obtained by adding the maximum virtual capacity is the total pressure adjustment virtual capacity. When the capacity exceeds the capacity, the starter machine of the inverter compressor is designated as the start designated machine,
Calculate the division value by dividing the sum of the starting rate setting value and the stopping rate setting value by 100, and calculate the total value of the maximum virtual capacity excluding the maximum virtual capacity of the compressor with the largest maximum virtual capacity in the operating constant speed compressor A multiplication value is calculated by multiplying the third total value obtained by adding the value and the total actual load virtual capacity of the operating inverter compressor with the division value, and the maximum virtual capacity is calculated by the multiplication value and the constant speed compressor during operation. The maximum virtual capacity addition value α of the largest compressor is calculated, and the addition value α is compared with the total pressure adjustment virtual capacity value β of the inverter compressor other than the inverter compressor that is scheduled to be stopped during operation.
When α is smaller than β, the inverter compressor's scheduled stop machine is the stop designated machine,
4. The compressor operation control device according to claim 3, wherein when α is β or more, the scheduled stop machine of the constant speed compressor is set as a stop designated machine. A designated machine selection function for selecting a start designated machine and a stop designated machine in the compressor operation control apparatus according to claim 5, and a start designated machine and a stop designation in the compressor operation control apparatus according to claim 6. With a designated machine selection function to select the machine,
Regarding the designation of the starter, if the selection obtained by both of the designated machine selection functions is the same, the starter is designated as selected, and at least one of the designated machine selection functions is the scheduled starter of the inverter compressor. Is selected, the inverter compressor will be the start designated machine,
Regarding the designation of the stop machine, if the selection obtained by both of the designated machine selection functions is the same, the stop machine is designated as selected, and when at least one of the inverter compressors is selected, the inverter compressor is stopped. A compressor operation control device that controls start and stop of the plurality of compressors using a scheduled machine as a stop designation machine.