JPH07119644A - Compressor equipment and method and system for controlling number of combination of compressors - Google Patents

Abstract

PURPOSE:To save the labor of the whole of a device, and to control pressure at a constant value without interfering the control of a different type compressor with each other in the control of the number of combination of turbo compressor and screw compressor. CONSTITUTION:Turbo compressors 10, 20 to be controlled at a constant wind pressure, screw/reciprocating compressors 30, 40 to be controlled by switching load/unload, a receiver tank 2 for storing the compressed air, and a pressure sensor 3 for detecting the internal pressure of the tank are combined. The turbo compressors 10, 20 and the screw/reciprocating compressors 30, 40 are switched for control by a number control board 1 so that they are not interfered with each other to enable the selection of a minimum number of compressor. A compressor equipment to be controlled at a constant pressure value, in which labor is saved in the whole thereof, is thereby realized. Simultaneously, the capacity of a receiver tank 2 is reduced to downsize the whole of a device by controlling the turbo compressors at a constant wind pressure for starting and stop, and the efficient operation without generating a loss due to the blow- off is enabled by restricting the switching of load/unload.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor facility used for general industry as an air source for factories, etc. Further, it is equipped with a plurality of compressors of different systems to efficiently respond to various load fluctuations. The present invention relates to a method for controlling the number of combined compressors and a system for controlling the number of combined compressors that operate to perform constant pressure control.

[0002]

2. Description of the Related Art Compressors are widely used, for example, in compressor equipment used for general industry as an air source for factories and the like, and a plurality of compressors are operated in accordance with various load fluctuations to maintain a constant pressure. We are in control. As a conventional technology of such a compressor number control system, for example, "Hitachi Review Vol. 70 No. 2 (February 1988, Nos. 41 to 4)
The technology described in "Page 6)" is already known.

The above-mentioned prior art relates to a system for controlling the number of a plurality of screw type or reciprocating type positive displacement compressors, and the compressors are loaded in accordance with the increase or decrease of the pumping pressure of the receiver tank for storing compressed air.・ Unload (load-no load) switching operation is performed, and the load condition of the compressor is calculated from the load operation time to start the compressor.
It is a system to stop. In such a prior art system, there is also an example in which a turbo compressor with load / unload switching control is used in place of the screw or reciprocating compressor described above. The load / unload switching operation is an operation in which the capacity adjuster is controlled during the operation of the compressor to control the discharge air volume, and the discharge air volume is zero in the unload state, for example.

As another conventional system described above, a system for controlling the number of turbo compressors is already known. In such a conventional system for controlling the number of turbo compressors, a plurality of constant air pressure controlled turbo compressors are installed, and the load / unload switching operation of the compressors is performed in accordance with the increase / decrease in the pressure flow rate while detecting the pressure flow rate. Alternatively, it starts and stops the compressor. Further, as a conventional technique, a system for starting / stopping a constant wind pressure control turbo compressor and a screw or reciprocating compressor is already known.

Further, as a system for controlling the number of compressors in which a constant air pressure control turbo compressor and a screw or reciprocating compressor are combined, the control of the turbo compressor and the reciprocating or screw compressor does not interfere. Thus, a control system of the number of compressors in which the control pressure of the turbo compressor is made higher than the control pressure of the screw or reciprocating compressor is already known.

[0006]

However, in the above-mentioned prior art, particularly in a unit control system in which a constant wind pressure control turbo compressor and a screw or reciprocating type compressor are combined, these different compressors are used. In the present situation, no specific proposal has been made on how to achieve the labor saving of the entire compression equipment by controlling the above, and no specific control method or system therefor is proposed. is there.

Further, in the above-mentioned conventional technique, in the system for performing the load / unload switching operation of the compressor according to the increase / decrease in the pressure of the receiver tank,
Since load fluctuations due to unload switching are repeated,
The load is repeatedly applied to the gears of the driving force transmission mechanism,
This may cause fatigue failure, and the sliding parts of the valve may wear due to repeated opening and closing of the intake valve and the blowoff valve, resulting in malfunction. In order to solve such a problem, it is necessary to suppress the number of load / unload repetitions, and for that purpose the capacity of the receiver tank must be increased according to the capacity of the compressor. The whole becomes large.

Therefore, in view of the above-mentioned conventional technique, the first object of the present invention is to reduce the labor of the entire equipment in compressor equipment using a plurality of compressors of different systems. At the same time, there is no control interference between compressors of different systems, and compressor equipment that enables stable and reliable constant output pressure control for various loads, as well as a compressor combination number control method and combination number To provide a control system.

Another object of the present invention is to provide a compressor facility using a plurality of types of compressors, in which the entire facility can be downsized without increasing the capacity of the receiver tank. It is in.

Another object of the present invention is to provide a control system for the number of combined compressors in a compressor facility using a plurality of compressors, which can reduce the number of load / unload switching operations. A control method and a combined number control system are provided.

[0011]

According to the present invention, firstly, a plurality of compressors having different systems are combined,
A compressor facility for selectively driving and controlling the plurality of compressors to pump a gas whose pressure is controlled to be constant to a load, wherein at least one compressor of a constant wind pressure control system is used.
Compressor of constant tank pressure system, receiver tank for storing gas pumped from the plurality of compressors, means for detecting gas pressure in the receiver tank, and operation of the plurality of compressors And a compressor control device for controlling the compressor, wherein the compressor control device selectively drives and controls the plurality of compressors based on the detection output from the gas pressure detection means, and the constant wind pressure. This is achieved by compressor equipment having a function of changing the set pressure of the constant air pressure control type compressor so as to prevent interference between the control type compressor and the control of the constant tank pressure type compressor.

In order to achieve the above-mentioned object of the present invention, a plurality of compressors having different systems are combined, the plurality of compressors are selectively driven and controlled, and a gas whose pressure is controlled to be constant is pumped to a load. Compressor equipment, at least one constant air pressure control type compressor, at least one constant tank pressure type compressor, and a receiver tank for storing gas pumped from the plurality of compressors , A means for detecting the gas pressure in the receiver tank, and a compressor control device for controlling the operation of the plurality of compressors, the capacity of the receiver tank of the compressor of the constant tank pressure system Compressor equipment determined based on capacity has been proposed.

Further, in order to achieve the above-mentioned object of the present invention, a plurality of compressors of different systems are combined, the plurality of compressors are selectively driven and controlled, and a gas whose pressure is controlled to be constant is pumped to the load. A compressor facility for controlling at least one constant air pressure control type compressor, at least one constant tank pressure type compressor, and a receiver tank for storing gas pressure-fed from the plurality of compressors. In a compressor facility including, the constant wind pressure control type compressor is a start / stop control, the tank pressure constant control type compressor is a start / stop and load / unload switching control, and,
During the load / unload switching control of the constant tank pressure type compressor, the control pressure of the constant wind pressure control type compressor is changed to
The present invention also proposes a method for controlling the number of combined compressors that sets a set value higher than the set pressure in the constant tank pressure control method.

Further, as a system for achieving the above-mentioned object of the present invention, a plurality of compressors of different methods are combined, the plurality of compressors are selectively driven and controlled, and a constant pressure is controlled for a load. Compressor equipment for pumping the gas, wherein at least one constant air pressure control type compressor, at least one tank pressure constant type compressor, and the gas sent from the plurality of compressors are compressed. In a compressor facility equipped with a receiver tank for storing and means for detecting the gas pressure in the receiver tank, in order to control by combining a plurality of compressors of different systems corresponding to the load of the compressor facility. The control system for controlling the number of combined compressors of (1), the control means for controlling the start / stop of the compressor of each of the constant wind pressure control methods, and the load / unload switching of the compressor of each of the constant tank pressure methods. And control means for controlling start and stop, and, based on the detection output from the gas pressure detection means, the control means of the constant air pressure control type compressor and the constant tank pressure type compressor There is also proposed a combined compressor number control system characterized by comprising a compressor control device for selectively driving and controlling the plurality of compressors by the control means.

[0015]

According to the compressor equipment of the present invention described above, the compressor control device selectively drives and controls the plurality of compressors based on the detection output from the gas pressure detection means, and also controls the constant wind pressure. By changing the set pressure of the constant air pressure control type compressor while preventing the control type compressor and the control of the constant tank pressure type compressor from interfering with each other, it is possible to save labor for the entire facility at the same time. It enables stable and reliable constant output pressure control for various loads without control interference between compressors of different systems.

Further, according to the compressor equipment of the present invention, a plurality of compressors of different systems are combined to selectively drive and control the compressors so as to pump the gas whose pressure is controlled to a constant load. By using at least one type of compressor as a constant air pressure control type compressor, the capacity of the receiver tank for storing the gas fed under pressure is determined based on the capacity of only the tank pressure constant type compressor. By doing so, the receiver tank can be downsized.

Further, according to the method for controlling the number of combined compressors according to the present invention, during the load / unload switching control of the constant tank pressure type compressor, the constant wind pressure control type compressor control pressure is used as the control pressure. By setting the pressure higher than the set pressure, it prevents the control interference between the compressors of different systems to save the labor of the entire equipment, and at the same time, the output pressure is stable and reliable even under various loads. Is possible.

Further, in the above-described system for controlling the number of combined compressors according to the present invention, one of the plurality of compressors constituting the compressor equipment is a compressor capable of only starting / stopping by each constant wind pressure control method, and the other one. Loaded with a constant tank pressure compressor
The above-mentioned control method is realized as a system by enabling unload switching and starting / stopping, and selectively controlling drive of these by the compressor control means.

Further, in the compressor equipment, the combined number-of-compressors control method and the combined-number control system of the present invention, a constant wind pressure control method capable of only starting / stopping as one of the compressors having a plurality of methods is used. By using the turbo compressor, which is a compressor, it is possible to suppress the number of load / unload switching in the compressor combination number control system as much as possible.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing the embodiments of the present invention, the technical recognition matters considered by the inventors who form the basis of the present invention will be described for understanding of the present invention.

First, a plurality of constant air pressure control type turbo compressors are installed, and the load / unload of the turbo compressor is switched according to the increase / decrease of the pressure feed flow rate while detecting the pressure feed flow rate, or the compressors are changed. In a system that starts and stops, especially when a screw or reciprocating compressor is combined, a receiver tank is provided so as not to be affected by the flow rate fluctuation due to loading and unloading of this screw or reciprocating compressor. It is necessary to detect the flow rate in the wake of the tank. In addition, it has been found that the control pressure of the turbo compressor needs to be higher than the control pressure of the screw or reciprocating compressor so that the control of the screw or reciprocating compressor and the control of the turbo compressor do not interfere with each other. Here, the control interference means a phenomenon in which a valve (suction valve, blow-off valve, etc.) of the turbo compressor causes hunting due to repeated loading and unloading of the screw or the reciprocating compressor.

On the other hand, there is a system in which a constant wind pressure control turbo compressor is combined with a load / unload switching control screw or a reciprocating compressor to start and stop the compressor in accordance with the pressure fed pressure. Similarly, the control pressure of the turbo compressor needs to be higher than the control pressure of the reciprocating or screw compressor. For this reason, when all the reciprocating machines or the screw compressors are in the unloading state or stopped, the pumping pressure rises to the control pressure of the turbo compressor. Further, in these techniques, since the turbo compressor is controlled by a constant wind pressure, when the load is reduced, a blow-off operation is performed and a loss occurs.

In view of the load fluctuation of the turbo compressor, therefore, a suction throttle valve for adjusting the gas supply amount on the suction side of the compressor and a surging for discharging the compressed gas to the outside are provided. When the blow-off valve is being pumped, the suction throttle valve is fully opened and the blow-off valve is fully closed at the same time. Is not the load / unload switching control that controls the pressure inside the receiver tank by changing the discharge pressure, but the discharge pressure is detected by detecting the discharge pressure of the compressor and changing the opening of the suction throttle valve and blowoff valve. Attention was paid to the constant wind pressure control to control the constant, that is, it was recognized that the purpose can be achieved by using the turbo compressor as a constant pressure control type compressor. It was. At this time, it has been noted that the control pressure of the turbo compressor can be made higher than that of the screw compressor or reciprocating compressor to prevent interference between the turbo compressor control and the screw or reciprocating compressor control. , Has been adopted.

Further, in the present invention, the control pressure of the turbo compressor is set higher than the control pressure of the screw or reciprocating compressor while the load fluctuation can be followed by the load / unload switching control of the screw or reciprocating compressor. On the other hand, if all the screws or reciprocating compressors are unloaded and the sending pressure rises, it is recognized that the problem can be solved by lowering the control pressure of the turbo compressor. ing. In addition, when the load decreases and the suction throttle valve of the turbo compressor is throttled to reach the lower limit opening that does not enter surging,
It has also been recognized that for efficiency reasons it is desirable to stop the turbo compressor without unloading it.

That is, in a unit control system in which a turbo compressor and a screw or a reciprocating compressor, which are different types of compressors, are combined, a constant wind pressure control is used for the turbo, and the gears are repeatedly loaded and unloaded. Eliminates the risk of malfunction due to wear of sliding parts due to repeated fatigue opening and closing of the suction throttle valve and blow-off valve, and the capacity of the receiver tank can be set to the frequency of loading and unloading of screws and reciprocating compressors. It has been confirmed that the receiver tank capacity can be made smaller because it is not necessary to consider the repetition frequency of loading and unloading of the turbo compressor, as it can be determined in accordance with only.

Since the control pressure of the turbo compressor is increased during the control of the screw or the reciprocating compressor, the control of the turbo compressor does not interfere with the control of the screw or the reciprocating compressor. When all the reciprocating compressors are unloaded and the pumping pressure rises, the turbo control pressure can be lowered to maintain the pumping pressure at a constant pressure without increasing it. Furthermore, when the load decreases and the turbo suction throttle valve is throttled to reach the lower limit opening that does not enter surging, by stopping the turbo compressor, the loss due to the blast of the turbo compressor in the unload state also occurs. Disappear.

That is, the present invention has been made on the basis of the above-mentioned technical recognition by the inventors, and based on these, realizes a compressor facility to which a unit control system described below is applied. Is.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings. First, FIG. 1 is a system configuration diagram of an embodiment of compressor equipment to which the number control system of the present invention is applied. The compressor equipment of the embodiment of FIG. 1 includes a plurality of compressors of different types, that is, two turbo compressors 10 and 20 and two screw compressors 30 and 40 in this embodiment. According to the pressure of the receiver tank 2 that stores the gas that is pressure-fed by a plurality of compressors of different types, and the pressure that is sent from the receiver tank 2 to the equipment of the factory production line or the utility equipment as a power source, for example. And a unit number control panel 1 for controlling the number of the plurality of compressors.

In such a compressor facility, first, the turbo compressors 10 and 20, which are one type of compressors, pump the sucked air by the compressor bodies 14 and 24, and the pumping pressure is adjusted by the pressure regulator 16. , 26, and when the load on the compressor is reduced, the openings of the suction throttle valves 13, 23 are throttled to reduce the pumping flow rate. Further, the load is reduced and the openings of the suction throttle valves 13, 23 are reduced. Is the lower limit opening set by the LLR (low limit relay) 12, 22, the suction throttle valve 1
Blow-off valve 1 while maintaining the opening of 3, 23 at the lower limit opening
A constant air pressure control system is provided in which the pumping pressure is controlled to be constant while avoiding the surging of the compressor by releasing a larger amount of air into the atmosphere by 5 and 25.

On the other hand, the other types of compressors, the screw compressors 30 and 40, absorb the sucked air into the compressor body 34,
When the pressure in the receiver tank 2 is detected by the pressure sensor 3 and the load on the equipment is reduced and the pressure in the receiver tank 2 rises, the suction valve 3 is used.
When the air blow valves 35 and 45 are fully opened at the same time as 1, 41 are fully closed, so that the gas is not pressure-fed (unloaded), and conversely, the load increases and the pressure in the receiver tank 2 decreases. In addition, the intake valves 31 and 41 are fully opened, and at the same time, the blowoff valves 35 and 45 are fully closed so that the entire amount is pressure-fed (on-load). The tank pressure is fixed by controlling the pressure inside the receiver tank 2 by switching. In addition, the screw compressors 30 and 40 fully close the suction throttle valves 13 and 23 by inputting an unloading and offloading switching command to the machine side panels 11 and 21, and at the same time, the blowoff valve 15 and
The above unloading operation in which 25 is fully opened, and the suction valve 31,
When 41 is fully closed, the blow-off valves 35 and 45 are fully opened at the same time, which makes it possible to switch to the above-described on-road operation in which gas is not pressure-fed.

The gas pressure-fed from the turbo compressors 10 and 20 and the screw compressors 30 and 40 is temporarily stored in the receiver tank 2, the internal pressure of the receiver tank 2 is detected by the pressure sensor 3, and the detected pressure is detected. Is input to the unit control panel 1. In this unit number control panel 1, the number of compressors required for pressure feeding is selected according to the tank internal pressure detected by the pressure sensor 3, and the machine side panels 11, 2 of each compressor are selected.
The load / unload command or the start / stop command is output to 1, 31, 41. These machine side panels 11, 21, 31, 41 are so-called control panels for each compressor, and each compressor is loaded / unloaded or started / stopped in response to a command from the unit control panel 1.

Further, according to the present invention, the unit control panel 1 has the turbo compressors 10, 20 while the screw compressors 30, 40 are performing load / unload switching control.
In order not to interfere with the control of (1), the set pressure of the pressure regulators 16, 26 on the turbo compressor side is set higher than the load / unload switching control pressure of the screw compressor. On the contrary, when all the screw compressors are unloaded or stopped, the unit control panel 1 is provided with a pressure controller on the turbo compressor side so that the pumping pressure of the receiver tank 2 does not rise. It is possible to output a control pressure switching command to the turbo compressor for lowering the set pressures of 16 and 26.

As a result, as the compressor equipment, the minimum required number of compressors corresponding to the load are always selected from a plurality of compressors of different systems for pressure feeding, so that the entire equipment is labor-saving. In addition to being able to achieve the above, the control from the different types of compressors, such as the turbo compressor and the screw compressor, does not interfere with each other. It is possible to control the output pressure of the compressed air at a constant value.

Further, in the configuration of FIG. 1 described above, the capacity of the receiver tank 2 is given by the following equation. That is, in the system of the present embodiment, since the turbo compressor is under constant wind pressure control, the capacity of the receiver tank 2 only needs to take into consideration the capacity of the screw compressor.
The term of becomes small, which causes the receiver tank 2
The capacitance V can be reduced. V ≧ q · (1-q) · W · R · T · t / ΔP In this formula, V: receiver tank capacity (m ³ ) ΔP: pressure fluctuation (kg / cm ² G) q: load factor ( Ratio of usage to compressor capacity) W: Compressor capacity (kg / s) R: Gas constant (kgm / kg ° K) T: Air temperature (° K) t: Cycle per load / unload switching The time (sec).

FIG. 2 is a diagram showing the relationship between the performance of the turbo compressor and the control pressure in the unit control system of FIG. 1, and FIG. 3 is the load of the compressor equipment in the unit control system of FIG. Start and stop the compressor according to pressure fluctuations,
FIG. 7 is a control flow diagram when switching between loading and unloading. In FIG. 3, P _{1 to} P ₄ in the uppermost stage are values detected by the pressure sensor 3, and P ₂ and P ₄ regarding the turbo in the lower two stages are P ₂ .
This is the value detected by the ICs 16 and 26.

As shown in FIG. 3, first, the first screw compressor of the compressor equipment is started to perform on-road operation. As a result, the compressed air is stored in the receiver tank 2 and the pumping pressure from the tank rises. Thereafter, when the amount of air used is less than or equal to the capacity of one screw compressor, unloading is performed when the pumping pressure rises to the set pressure P3, and as a result, onloading is performed when the pumping pressure drops to P1. By controlling the screw compressor in this way, the pumping pressure can be controlled to be constant near the control center pressure P2.

Next, the amount of air used depends on the screw compressor 1
When the number exceeds the number of units, the pressure does not increase even when the first screw compressor is on-loaded, so the second unit of the screw compressor is further started. Similarly to the above, when the amount of air used is less than or equal to two screw compressors, the second screw compressor is unloaded when the pumping pressure rises to P3, and when it is reduced to P1, it is on-loaded. , The pressure is controlled to be constant near the control center pressure P2.

Further, when the amount of air used exceeds the amount of two screw compressors, the pressure does not rise even when the second screw compressor is on-loaded. to start. When the amount of air used is equal to or more than this additional turbo unit and equal to or less than one turbo unit + 2 screws, when the pumping pressure rises to the set pressure P3, the screen compressor is unloaded and the pumping pressure is increased. Is P1
When it falls to 0, the control center pressure can be controlled to be constant near P2 by performing on-loading. As described above, when simultaneously operating a plurality of different compressors, if the set pressure for constant wind pressure control of the turbo compressor is equal to or less than the above set pressure P3, the turbo compressor and the screw compressor Since the control interferes, the control pressure of the turbo compressor is raised above the set pressure P3.

If the amount of air used exceeds the capacity of one turbo compressor + two screw compressors, the pumping pressure does not increase even when the screw compressor is on-loaded. Start the second unit. When the amount of air used is 2 turbo compressors or more and 2 turbo compressors + 2 screw compressors or less, the screw compressor is unloaded when the pressure feed pressure rises to the set pressure P3, and the pressure feed pressure is P1. When it falls to 0, the pressure is controlled to be constant near the control center pressure P2 by on-loading. At this time as well, the set pressure of the constant air pressure control of the turbo compressor is raised to P4 which is the set pressure P3 or more so that the control of the turbo compressor and the control of the screw compressor do not interfere with each other, as described above.

Thereafter, when the amount of air used becomes equal to or less than the capacity of two turbo compressors, the pressure rises when the two screw compressors are unloaded, so the set pressure for constant wind pressure control of the turbo compressor is increased. To P2. This allows
The pressure is controlled to be constant near P2. When the amount of air used further decreases, the pressure rises when the pumping flow rate is still too large even if the suction throttle valve of the turbo compressor reaches the lower limit opening. Therefore, either stop one turbo compressor or unload it. While the screw compressor is on-loaded. When the amount of air used is less than or equal to one turbo compressor + two screw compressors, the screw compressor is switched between on-load and unload as described above,
The pumping pressure is constantly controlled near P2. At that time, the control pressure of the turbo compressor is switched to P4 which is equal to or higher than the set pressure P3.

Finally, when the amount of air used is equal to or less than that of one turbo compressor, the pressure rises even if two screw compressors are unloaded, so the control moves to constant wind pressure control of the turbo compressor. When the amount of air used further decreases, the pressure rises when the pumping flow rate is still too large even if the suction throttle valve of the turbocompressor reaches the lower limit opening, so either the remaining turbocompressor is stopped or Unload and load screw compressor on.

As described above, according to the present system, as the compressor equipment provided with a plurality of compressors of different systems, the minimum required number of compressors of the system corresponding to the load is always selected from among them. By performing the pressure feeding, it is possible to save the labor of the entire equipment, and it is possible to control the pressure feeding pressure to be substantially constant without interfering with the control of the turbo compressor and the screw compressor of different systems. In addition, the turbo compressor is not switched between load and unload, and is stopped when the suction throttle valve is at the lower limit opening degree or less, so-called start / stop operation, so that there is no loss due to blowing of the turbo compressor. It is possible to control the number of units efficiently.

Instead of increasing the control pressure of the turbo compressor during the load / unload switching control of the screw compressor, the turbo compressor and the screw compressor are forcibly operated under full load. It is also possible to prevent control hunting.

Further, according to the compressor equipment, the combined compressor number control method and the combined number control system according to the embodiments of the present invention described in detail above, the following effects can be achieved. (A) New function ・ The pumping pressure is detected and the turbo control pressure is automatically switched according to the operating state of the screw, so that the pumping pressure can be controlled to be constant. (B) Economical and simplification-Since there is no loss due to the blow of turbo, the running cost of equipment can be reduced. -Since the turbo is controlled by constant air pressure, the receiver tank can be made smaller. (C) Improvement of performance and efficiency-Since the turbo is controlled by constant wind pressure, the number of load / unload switching can be suppressed, and fatigue failure of rotating bodies such as gears due to load fluctuation can be prevented.

In the above embodiments, only the turbo compressor is used as the compressor of one type and the screw compressor is used as the compressor of the other type, but the present invention is not limited to this. Alternatively, for example, a reciprocating compressor can be adopted as the other type compressor. In this case, the receiver tank is preferably installed between the discharge pipe (port) of the turbo compressor and the discharge pipe (port) of the reciprocating compressor so that the pulsation of the reciprocating compressor is not transmitted to the turbo compressor. .

[0046]

As is apparent from the above detailed description, according to the compressor equipment, the combined number control method and combined number control system of the present invention, a plurality of compressors having different methods can be used. In the compressor equipment used, there is no control interference between compressors of different systems, and stable and reliable constant output pressure control is possible even for various loads, so labor saving in the entire equipment is also possible. In addition, it is possible to reduce the size of the entire equipment without increasing the capacity of the receiver tank, and it is also possible to suppress the number of load / unload switching, which is a technically excellent effect. Demonstrate.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of compressor equipment to which a compressor number control system according to an embodiment of the present invention is applied.

FIG. 2 is a diagram showing a relationship diagram between the performance of a turbo compressor and control pressure in the compressor equipment of FIG.

FIG. 3 is an operation of each part for explaining the operation of controlling the constant pressure by starting / stopping and loading / unloading various compressors according to load pressure fluctuations in the system for controlling the number of compressors shown in FIG. 1; It is a control flow figure showing a waveform.

[Explanation of symbols]

 1 Number control panel 2 Receiver tank 3 Pressure sensor 10,20 Turbo compressor 30,40 Screw compressor 12,22 LLR 13,23,33,43 Suction throttle valve 11,21,36,41 Machine side panel 14,24, 34,44 Compressor body 15,25,35,45 Blow-off valve 16,26 Pressure control valve 17,27,37,47 ... Check valve

Claims (15)

[Claims] 1. A combination of a plurality of compressors of different systems,
A compressor facility for selectively driving and controlling the plurality of compressors to pump a gas whose pressure is controlled to be constant to a load, wherein at least one compressor of a constant wind pressure control system is used.
Compressor of constant tank pressure system, receiver tank for storing gas pumped from the plurality of compressors, means for detecting gas pressure in the receiver tank, and operation of the plurality of compressors And a compressor control device for controlling the compressor, wherein the compressor control device selectively drives and controls the plurality of compressors based on the detection output from the gas pressure detection means, and the constant wind pressure. In order to prevent the control type compressor and the control of the tank pressure constant control type compressor from interfering with each other, a function of changing the set pressure of the constant air pressure control type compressor is provided. Compressor equipment. 2. The compressor facility according to claim 1, wherein a turbo type compressor is used as the constant wind pressure control type compressor. 3. The compressor facility according to claim 1, wherein a screw or reciprocating type compressor is used as the constant-pressure tank control type compressor. 4. The compressor equipment according to claim 1, wherein the constant air pressure control type compressor is controlled to start / stop. 5. The compressor facility according to claim 1, wherein the constant tank pressure control type compressor is capable of load / unload switching control as well as start / stop control. Machine equipment. 6. A combination of a plurality of compressors of different systems,
A compressor facility for selectively driving and controlling the plurality of compressors to pump a gas whose pressure is controlled to be constant to a load, wherein at least one compressor of a constant wind pressure control system is used.
Compressor of constant tank pressure system, receiver tank for storing gas pumped from the plurality of compressors, means for detecting gas pressure in the receiver tank, and operation of the plurality of compressors And a compressor control device for controlling the compressor, wherein the capacity of the receiver tank is determined based on the capacity of the constant tank pressure type compressor. 7. The compressor equipment according to claim 4, wherein the capacity V of the receiver tank is determined by the following equation: V ≧ q · (1-q) · W · R · T · t / ΔP , V: receiver tank capacity (m ³ ) ΔP: pressure fluctuation (kg / cm ² G) q: load factor (ratio of usage to compressor capacity) W: constant wind pressure control compressor capacity ( kg / s) R: Gas constant (kgm / kg ° K) T: Air temperature (° K) t: Compressor facility characterized by the cycle time (sec) per load / unload switching. 8. A combination of a plurality of compressors of different systems,
A compressor facility for selectively driving and controlling the plurality of compressors to pump a gas whose pressure is controlled to be constant to a load, wherein at least one compressor of a constant wind pressure control system is used.
In a compressor facility including a single tank pressure constant type compressor and a receiver tank for storing gas pumped from the plurality of compressors, the constant air pressure control type compressor is a start / stop control. The constant tank pressure control type compressor has start / stop and load / unload switching control, and during the load / unload switching control of the constant tank pressure type compressor, the constant wind pressure control type compression is performed. A method for controlling the number of combined compressors, wherein the control pressure of the compressor is set to a value higher than the set pressure of the constant tank pressure control method. 9. The method for controlling the number of combined compressors according to claim 8, further comprising the step of controlling the control pressure of the constant pressure control type compressor when all of the constant tank pressure type compressors are in an unload state. Is set to a lower set value than the high set value. 10. The method of controlling the number of combined compressors according to claim 8, wherein the control pressure of the compressor of the constant wind pressure control system is controlled during load / unload switching control of the constant tank pressure system compressor. The method of controlling the number of combined compressors is characterized in that the compressor of the constant air pressure control type compressor is forcibly operated at full load instead of increasing the temperature. 11. A compressor facility for combining a plurality of compressors of different systems, selectively driving and controlling the plurality of compressors, and feeding pressure-controlled gas under constant pressure to a load.
At least one constant air pressure control type compressor, at least one constant tank pressure type compressor, and a receiver tank that stores gas that is pressure-fed from the plurality of compressors;
In a compressor facility provided with a means for detecting the gas pressure in the receiver tank, a combination number of compressors for controlling by combining a plurality of compressors of different systems corresponding to the load of the compressor facility. The control system, a control means for controlling the start / stop of the compressor of each constant wind pressure control method, a control means for controlling load / unload switching and start / stop of the compressor of each constant tank pressure method, Then, based on the detection output from the gas pressure detection means,
And a compressor control device for selectively driving and controlling the plurality of compressors by the control means of the constant wind pressure control type compressor and the control means of the tank constant pressure type compressor. A system for controlling the number of combined compressors characterized by the above. 12. The combined number control system for compressors according to claim 11, wherein the constant wind pressure control type compressor is a turbo type compressor. 13. The combination number control system for a compressor according to claim 11, wherein the constant tank pressure control type compressor is a screw or reciprocating type compressor. system. 14. The combined number of compressors control system according to claim 11, wherein the compressor control device is of the constant air pressure control system during load / unload switching control of the constant tank pressure system compressor. A system for controlling the number of combined compressors, wherein the control pressure of the compressor is set to a value higher than the set pressure of the constant tank pressure control method. 15. The combined number control system for compressors according to claim 11, wherein the compressor control device compresses the constant air pressure control system when all of the constant tank pressure system compressors are in an unload state. A system for controlling the number of combined compressors, wherein the control pressure of the compressor is set to a lower set value than the high set value.