JPS61210405A - Pressurized fluid feeding device - Google Patents

Abstract

PURPOSE:To supply and send the pressurized fluid of two systems with use of devices as one set by branching to a main supplying sending system, provid ing a sub-supplying sending system, controlling an inlet vane of a main com pressing machine in accordance with the flow detecting value, and making constant the fluid flow of a main supplying sending system. CONSTITUTION:A main supplying sending system 1 provides a sub-supplying sending system 9 at the discharge side of an air turbo compressing machine 3 thereof, from which air is supplied as a branch to a power air system. Between a branching part 10 of the system 9 and the inlet side of a booster 11, a flow detecting means 17 to detect the flow of the system and obtain the flow change of the system 9 based upon the change of the necessary flow of the power air system is provided. The means 17 converts and outputs the flow change detected at an orifice 18 to an electric signal S7. The signal S7 is a flow correcting signal from a power air system side, in which the necessary flow is suitably changed, for the air separating device side where the securing of the constant flow is required, the signal is taken into consideration as a preceding element, an inlet vane 4 of a compressor 3 is controlled in accordance with the detected value, thereby the flow of the system 1 is constantly secured.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a pressure fluid feeding device, and in particular, to a pressure fluid feeding device for feeding pressure fluid to two feeding systems with different flow m1 pressures based on a single compressor. Pressure fluid feeding allows pressure fluid to be fed at different pressures and flow rates by equipping the other feeding system with a separate compressor without causing fluctuations in the pressure fluid in one feeding system. Regarding equipment.

[Prior Art] A device for supplying pressure fluid such as compressed air has a required flow rate,
Generally, they are installed individually depending on the required pressure.

For example, in steelworks equipment that consumes a large amount of air as shown in Figure 2, compressed air can be used in two ways. A first feeding system a and a second feeding system connected to the power air system for operating the packing equipment are installed separately, and each feeding system a and b has a corresponding one. An air turbo compressor 111c, d with a capacity of This is because the first feeding system a is required to ensure a constant flow rate of compressed air with extremely high precision for steel manufacturing, whereas the feeding system in box 2 is required to operate the various machines a. This corresponds to the fact that a higher pressure than that of the first feeding system a is required.

[Problems to be Solved by the Invention] As mentioned above, when pressure fluid supply systems are installed separately depending on the use of pressure fluid on the side to be supplied, it is possible that they are not operated sufficiently. In some cases, the vehicle is being operated inefficiently. For example, in the above-mentioned steelworks equipment, the iron production volume may be reduced and the air turbo compression 111c of the first feed system a that supplies compressed air to the air separation device 1m1 may be operated in a throttled state.

In such a case, compressed air is fed from the air turbo compressor 11c of the first feeding system a, which has excess capacity, to the power air system to fully operate it, and the second
It is conceivable to remove the air turbo compressor d from the feed system in order to improve equipment efficiency, save energy, and save manpower. Furthermore, similar effects can be obtained even in new equipment by adopting a similar configuration.

However, while the first feed system a requires a constant flow rate, the second feed system requires high pressure and the compressed air needed to start and stop various devices. Because the flow rate changes, if you simply connect the second feed system in parallel to the first feed system a, the change in flow rate in the second feed system will directly affect the first feed system a. This was a problem as it caused significant fluctuations.

In other words, when a single compressor is used to feed pressure fluid to two feeding systems with different flow rates and pressures,
It has been desired to devise an installation #lI configuration in which fluctuations in one feeding system do not affect the other feeding system.

[Object of the Invention] The present invention was devised in view of the above-mentioned problems, and its purpose is to supply pressurized fluid to two systems with different flow rates and pressures using a single compressor. When feeding, it is possible to feed pressure fluid at different pressures and flow rates by installing a separate compressor in the other feeding system without changing the overall flow rate of pressure fluid in one feeding system. A pressurized fluid delivery device is provided.

[Summary of the Invention] The present invention provides a main feeding system equipped with a main compressor with a sub-feeding system branched from this, and the pressurized fluid fed to the sub-feeding system is transferred to the sub-compressor. At the same time, a flow rate detection means is provided between the auxiliary compressor and the branch part to detect a change in the flow rate of the 1itJ feeding system, and the main compression is increased by the suction vane control means according to the detected value of the flow rate detection means. Controls the machine's suction vanes,
The pressure fluid flow rate of the main feeding system is made constant.

[Example] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows pneumatic feeding equipment in a steel mill or the like as an example of equipment for a pressurized fluid feeding device according to the present invention. In this equipment, it is necessary to feed air to two systems: the air separation device and the power air system, and a main feeding system and a sub-feeding system are provided. On the other hand, the power air system requires a higher pressure than the main feed system, and the required flow rate fluctuates due to equipment startup and shutdown, etc.

As shown, a main feed system 1 for feeding air as pressure fluid is connected to an air separation device. The main feed system 1 is also connected to an air turbo compressor tg13 that is a main compressor that takes in air from an absorption tower 2 that collects atmospheric air and discharges it.

The flow rate of this air turbo compressor 3 is controlled by suction vanes 4 provided therein. The operation of the suction vane 4 is controlled by a control signal @S1 output from an air flow controller 5 serving as suction vane control means.

Here, on the air separation equipment side, switching of the culm r5f and equipment (lipex switching) is performed several times a day, and the required flow rate that should be kept constant changes during this switching.

Further, in the main feeding system 1, the flow rate always fluctuates slightly. The air flow rate controller 5 controls the opening degree of the suction vane 4 in response to large flow rate changes mainly related to lipex switching, and maintains the flow rate constant after the change. Furthermore, air flow rate FJJ
The meter 5 receives the flow rate fluctuation signal @S2 detected by the orifice 6 interposed in the main feed system 1 and output from the flow rate transmitter 7, and calculates the elements to be added to it based on a predetermined required flow rate signal S. The flow rate change signal S2 is processed as follows, and the suction vane 4 is controlled to eliminate even the slightest fluctuation. The electric signal 8 output from the air flow rate controller 5 is converted into hydraulic pressure by the electro-hydraulic operating device 8, and the suction vane 4 is driven by this hydraulic pressure.

On the other hand, the main feed system 1 is provided with a DI feed system 9 that branches off from the discharge side of the air turbo compressor 3 and feeds air to the power air system. This so-called feeding system 9 includes a reciprocating pressure booster 1111 as a sub compressor for boosting the pressure of the air fed from the main feeding system 1 via the branch section 10.
The booster 11 generates air at a higher pressure than that of the main feed system 1 and supplies it to the power air system. By the way, in a power pneumatic system, equipment is started and stopped relatively frequently, and the required flow rate fluctuates.

Against this fluctuation in required flow rate! 1lff is booster 11
This capacity adjustment is controlled by the R pressure machine capacity: JJ adjustment signal S4 output from the air pressure regulator 12. In detail, the variation in the required flow rate of the power air system is D
It is detected by the pressure transmitter 13 as a fluctuation in the discharge side pressure of the booster 11 of the I feed system 9, and the detection signal @S5 is input to the air pressure regulator 12. The air pressure alli1 meter 12 performs known processing on the detection signal S5 and outputs it as an electrical signal as the air pressure capacity adjustment signal s4, and then this signal S4 is passed through the sequence 14 to the known '' of the τ booster 11. This is input to the capacity adjustment means 16, and the booster 11 is configured to operate at a capacity commensurate with the required flow rate.

By the way, the branch part 10 of the sub-feeding system 9 configured in this way
and the suction side of the booster 11, there is a sub-feed system 9 which detects the flow rate of the sub-feed system 9 and based on fluctuations in the required flow rate of the power air system.
A flow rate detection means 17 is provided to detect a change in the flow rate. In this embodiment, the flow rate detection means 17 converts the change in flow rate detected by the orifice 18 into an electrical fi number 87 and outputs it. This drifting change faith @s7
is a flow rate correction signal from the power air system side, where the required flow rate fluctuates as appropriate, to the air separation equipment side, which is required to secure a constant flow rate.This signal is taken into account as a preceding element, and the air turbo is adjusted according to the detected value. By controlling the suction vane 4 of the compression 1II3, a constant flow rate of the main feed system 1 is ensured. Specifically, the flow rate change signal S7 is input to the air flow ffi surface meter 5 of the main feed system 1. In the air flow ff1W total 5, the predetermined required flow rate signal S8 of the air separation device polishing is the control base, and the flow rate change signal S7 is treated as a preceding element for the correction to be added to the required flow rate of the power air side. be done. The processed invasion signal S1 is supplied to the suction vane 4 via the heavy oil operating device 8.

In addition, 20 is a blow-off valve for low flow control of the air turbo compressor 3, and 1 is a flow meter.

Next, we will discuss the effect.

When the air turbo compressor 3 is started, air as a pressurized fluid is sent under pressure to the air separation device via the main feed system 1, and
The air is pressure-fed from the branch part 10 to the sub-feeding system 9, and the air pressure-fed to the sub-feeding system 9 is further boosted in pressure by the booster 11 and then supplied to the power air system. At this time, the air flow rate controller 5 receives a signal S8 of a predetermined required flow rate to the air separation device side, which is the basis of control, and a flow rate change as a preceding element outputted from the outflow detection means 17 of the sub-feeding system 9. The signal @s7 and the flow rate correction signal S2 from the flow rate transmitter 7 are input, and based on these, the suction vane 4 is controlled to maintain a constant flow rate in the main feed system 1 while controlling the air molecule II device and the power air system. The required flow rate is supplied to the

Here, when the required flow rate is changed by starting or stopping various types of air conditioners in the power air system, the change is input to the capacity adjustment means 16 of the booster 11 via the air pressure regulator 12, and the change is input to the capacity adjustment means 16 of the booster 11, 11 capacity adjustments are made. This capacity adjustment causes an outflow change between the branch 1o and the booster 11, and this change is detected by the flow rate detection means 17, and the detection signal S7 is inputted to the air flow rate controller 5 as a preceding element. Ru. The air flow rate controller 5 generates a flow rate change signal S7 with respect to a base required flow rate signal S8.
is included as a correction factor, and the suction vane 4 is operated and controlled to change the flow rate. As a result, even if the required flow rate fluctuates in the sub-feeding system 9, this fluctuation can be absorbed by the air turbo compressor 13 and its influence on the main feeding system 1 can be suppressed, and the air pressure can be maintained at a substantially constant flow rate. transmission status can be maintained.

Incidentally, when the air separation device side switches the air pressure, the air flow rate controller 5 controls the suction vane 4 based on the control signal S3. When switching RIPEX, the airflow mg of the flow rate change signal S7 and the flow rate fluctuation signal S2
Since the input to the one-segment meter 5 may destabilize the control of the suction vane 4, each signal 8 is
7, S2 is kept as is.

In the present invention explained above, two systems (air separation device,
When feeding pressure fluid to feeding systems with different flow rates and pressures (power pneumatic system), disturbances in one system (sub-feeding system 9) are removed to reduce the disturbance in the other system (main feeding system 1). A substantially constant flow rate can be ensured, and pressure fluid can be supplied by separately providing compression (m<pressure increase 111) in one system. In other words, pressure fluid is basically supplied by a single compressor, with the pressure fluid supply devices that were conventionally installed corresponding to the required flow rates and pressures so that there is no influence on each other. It is possible.

Therefore, equipment simplification, energy savings, and labor savings can be achieved.

In particular, in the present invention, as in the embodiment, the power air system is 11 air flow sections can be widened. That is, for example, the air turbo compressor 3 is 70~
It is operated at 100%, and booster 11 is 0.25.50
．． ... Pressure increase va11 when operation is possible at 100%
from 70% of turbo compressor 3 when using at 50%
The desired pressure fluid supply can be achieved with up to 100% control and therefore the operation can be set at the most efficient point.

[Effects of the Invention] To summarize, according to the present invention, the following excellent effects are achieved.

(1) Separately from the main feeding system that supports the main compressor and feeds pressure fluid, a sub-feeding system is branched out, which is equipped with a sub-compressor that feeds pressurized fluid to different systems at different pressures and flow rates. When connecting, a flow rate detection means for detecting a change in the flow rate of the auxiliary feeding system is provided between the auxiliary compressor and the branch, and the main compressor suction is controlled by the suction vane fI11wJ means according to the detected value of the flow rate detection means. Since the vanes are controlled, disturbances in the side feed system can be eliminated and a constant flow rate in the main feed system can be ensured.

(2) Therefore, equipment simplification, energy savings, and labor savings can be achieved.

(3) A wide range of operational control can be performed by combining the main compressor and the sub-compressor, and operational efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing a preferred embodiment of the present invention, and FIG. 2 is a system diagram showing a conventional example. In the figure, 1 is the main feeding system, 3 is the air turbo compressor exemplified as the main compressor, 4 is the suction vane, and 5 is the suction vane 111.
111 is an air flow rate controller exemplified as means; 9 is a sub-feeding system; 1o is a branch section; 11 is a booster exemplified as a sub-compressor; and 17 is a flow rate detection means.

Claims (1)

[Claims] A main compressor that discharges pressure fluid, a main feed system that is connected to the main compressor and feeds the discharged pressure fluid, and a sub-feed system that is branched off from the main feed system. , a sub-compressor provided in the sub-feeding system for increasing the pressure of the pressure fluid to be fed, and a sub-compressor provided between the sub-compressor and the branch section,
A flow rate detection means for detecting a change in the flow rate of the auxiliary feeding system, and controlling a suction vane of the main compressor according to a detected value of the flow rate detection means to keep the flow rate of the main feeding system constant. 1. A pressure fluid feeding device comprising suction vane control means for controlling the suction vane.