JPH0783476A - Room pressure controller - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a room pressure control device for controlling a differential pressure between inside and outside of a plurality of spaces which are arranged adjacent to each other and communicated with each other by a door. The purpose is to significantly reduce pressure fluctuations compared to the conventional method. [Structure] A plurality of differential pressure gauges for measuring the differential pressure between a plurality of spaces arranged adjacent to each other and communicated by a door and each of the spaces adjacent to these spaces, and a differential pressure value from the differential pressure gauge is input. The fuzzy inference means for obtaining the opening correction amount of a plurality of pressure adjusting dampers for adjusting the pressure in each space by fuzzy inference, and inputting the opening correction amount, and based on the opening correction amount Output signal processing means for calculating and outputting the opening degree of the pressure adjusting damper, and inputting the differential pressure values of the plurality of differential pressure gauges, and when at least one of the plurality of differential pressure values is 0 or near 0, all of the above And a damper opening holding means for holding the opening of the pressure adjusting damper as it is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a room pressure control device for controlling a differential pressure between inside and outside of a plurality of spaces which are arranged adjacent to each other and communicated with each other by a predetermined value.

[0002]

2. Description of the Related Art Generally, in a facility such as a bio-clean room for manufacturing pharmaceuticals, or an animal breeding room where experiments and studies are carried out using aseptic animals, keep the room clean and keep bacteria from outside. ， It is necessary to surely prevent the invasion of pathogens, and in such air conditioning of facilities, the pressure inside the room is made higher than the pressure outside the room to form a barrier to the outside.

FIG. 16 shows a facility provided with such an air conditioner. In this facility, room A 11 and room B 13 which are clean rooms are arranged adjacent to each other, and room A 11 and room B are provided. The room 13 faces the corridor 17 via the front room 15.

Corridor 17 and front room 15, front room 15 and room A 1
1. The front chamber 15 and the B chamber 13 have doors 15a and 1a, respectively.
It is connected by 1a and 13a. Front chamber 15, A chamber 1
An air supply conduit 21 for guiding the air from the air supply fan 19 into the front chamber 15, the A chamber 11 and the B chamber 13 is opened in the 1 and B chambers 13.

In the air supply conduit 21, a constant air volume device 23 and an air supply side highly airtight damper 25 are arranged in this order from the upstream side. In the front chamber 15, the A chamber 11 and the B chamber 13, an exhaust pipe line 29 for guiding the air from the front chamber 15, the A chamber 11 and the B chamber 13 to the exhaust fan 27 is opened.

In this exhaust pipe 29, an exhaust side highly airtight damper 31 and a pressure adjusting exhaust damper 33 are arranged in this order from the upstream side.
Are arranged. Reference numerals 35a, 35b, and 35c represent differential pressure gauges, and the differential pressure gauges 35a include the corridor 17 and the antechamber 1.
The differential pressure gauge 35b is configured to measure the differential pressure between the front chamber 15 and the A chamber 11, and the differential pressure gauge 35c is configured to measure the differential pressure between the front chamber 15 and the B chamber 13.

The differential pressure values from the differential pressure gauges 35a, 35b and 35c are input to the programmable controller 37. In the above-mentioned air conditioner, in the steady state,
The air supply fan 19 and the exhaust fan 27 are operated at a constant rotation speed, and the air supply side highly airtight damper 25 and the exhaust side highly airtight damper 31 are fully opened.

Further, the controller 37 operates the constant air volume device 23 with its opening adjusted so as to maintain the set air volume. Further, the pressures in the front chamber 15, the A chamber 11, and the B chamber 13 are controlled by the programmable controller 3
7, the corridor 17 and the front chamber 15, the front chamber 15 and the A chamber 11, and the front chamber 15 and the B chamber 13 have a predetermined differential pressure by automatically adjusting the opening degree of the pressure adjusting exhaust damper 33. Is maintained as.

[0009]

However, in such a conventional air conditioner, since the control of each pressure adjusting exhaust damper 33 is individually performed by the controller 37 by the PID control, the front chamber 15 , Room A 11
When opening and closing the doors 15a, 11a, 13a of the B chamber 13, there is a problem that the pressures in the front chamber 15, the A chamber 11 and the B chamber 13 greatly fluctuate as shown in FIGS.

17 and 18, the room pressures of the front chamber 15, the A chamber 11 and the B chamber 13 are all the corridor 17
The pressure difference between the room and the room is the corridor 17 and the antechamber 15
Is 2 mmAq, Room A 11 and front room 15 are 3 mmAq, Room B 13
And the front chamber 15 are set to 3 mmAq.

FIG. 17 shows a door 15a between the corridor 17 and the antechamber 15 when, for example, a person goes in and out or equipment is carried in.
It shows the change in the differential pressure between the rooms when the room is opened and closed.
The door 15a between the front chamber 7 and the front chamber 15 opens, and the chamber pressure of the front chamber 15 becomes 0 mmAq, and the chamber pressure of the A chamber 11 and the B chamber 13 approaches 3 mmAq. When the door 15a is closed, each chamber pressure causes an overshoot. In this case, the A chamber 11,
The chamber pressure of the B chamber 13 and the chamber pressure of the front chamber 15 reverse for a moment, and after that, each of them returns to the set value.

FIG. 18 shows the door 1 between the front chamber 15 and the A chamber 11.
This shows a change in the pressure difference between the chambers when the door 1a is opened and closed. The chamber pressures of the front chamber 15 and the A chamber 11 become equal at the same time when the door 11a is opened, and the chamber pressures of both chambers gradually increase. At this time, the pressure adjusting exhaust damper 33 of the front chamber 15 is opened toward the A chamber 1
The pressure adjusting exhaust damper 33 of No. 1 is controlled to be closed. The chamber pressure of the B chamber 13 increases as the chamber pressure of the front chamber 15 increases so that the pressure difference between the B chamber 13 and the front chamber 15 is maintained at a set value of 3 mmAq. When the door 11a is closed, the pressure adjusting exhaust damper 33 of the front chamber 15 is opened too much, and the pressure adjusting exhaust damper 33 of the A chamber 11 and the B chamber 13 is closed too much. The result takes more than a second.

An object of the present invention is to solve the above problems and to provide a room pressure control device capable of greatly reducing the fluctuation of the room pressure when the door is opened and closed.

[0014]

According to another aspect of the present invention, there is provided a room pressure control device for controlling a differential pressure between a plurality of spaces which are arranged adjacent to each other and communicated with each other by a door and each of the spaces adjacent to these spaces. A plurality of differential pressure gauges to be measured and a plurality of pressures that adjust the pressure in each of the spaces by inputting differential pressure values from the differential pressure gauges and by fuzzy reasoning using a predetermined fuzzy rule and membership function. Fuzzy inference means for obtaining the opening correction amount of the adjustment damper, and the output signal processing for inputting the opening correction amount and calculating and outputting the opening of each of the pressure adjustment dampers based on the opening correction amount. Means and differential pressure values of the plurality of differential pressure gauges are input, and when at least one of the plurality of differential pressure values is 0 or near 0, the opening of all the pressure adjusting dampers is maintained as it is. Open damper In which a holding means.

According to a second aspect of the present invention, there is provided the chamber pressure control device according to the first aspect, wherein when the damper opening maintaining means has a space in which the operation is stopped, the differential pressure of the stopped space is increased. Even when the value becomes 0 or near 0, the opening degree of the pressure adjusting damper in the other space is not maintained as it is.

[0016]

In the room pressure control device according to the first aspect, any one of the doors is opened, and the differential pressure value of any one of the differential pressure gauges becomes
At 0 and in the vicinity of 0, the openings of all the pressure adjusting dampers are maintained as they are.

In the room pressure control device according to the second aspect, even if the differential pressure value of the space in the stopped state becomes 0 or close to 0, this does not affect the control of other spaces, and the pressure in the stopped state is kept. Control is performed by separating the space.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a facility such as a bioclean room provided with an embodiment of the fuzzy control apparatus of the present invention. In this facility, a room A 41 which is a clean room is shown.
And B room 43 are arranged adjacent to each other, and A room 41 and B room
The room 43 faces the corridor 47 via the front room 45.

Corridor 47 and front room 45, front room 45 and room A 4
1. The front chamber 45 and the B chamber 43 have doors 45a, 4 respectively.
It is connected by 1a and 43a. Front chamber 45, A chamber 4
The 1 and B chambers 43 are provided with air supply conduits 51a, 51b, 51c for guiding the air from the air supply fan 49 into the front chamber 45, the A chamber 41 and the B chamber 43.

The air supply pipes 51a, 51b, 51c are provided with constant air flow rate devices 53a, 53b, 53c in order from the upstream side.
And the air-supply side high airtight dampers 55a, 55b, 55c are arranged.

The front chamber 45, the A chamber 41 and the B chamber 43 include:
Exhaust pipe lines 59a, 59b, 59c for guiding the air from the front chamber 45, the A chamber 41, and the B chamber 43 to the exhaust fan 57.
Is opened.

In the exhaust pipe lines 59a, 59b, 59c, exhaust side high airtight dampers 61a, 61 are sequentially provided from the upstream side.
b, 61c and pressure adjusting exhaust dampers 63a, 63
b and 63c are arranged.

The constant air volume devices 53a, 53b, 53c can set the air volume by an external signal, and have a function of automatically adjusting the opening so as to maintain the air volume. Also, it is possible to forcibly fully close by an external signal.

Exhaust dampers 63a, 63b, 6 for adjusting pressure
3c has a function of proportionally changing the opening degree by an analog signal from the outside. Reference numerals 65a, 65b, 6
5c shows a differential pressure gauge, and the differential pressure gauge 65a is shown in the corridor 47.
The differential pressure gauge 65b is configured to measure the differential pressure between the front chamber 45 and the A chamber 41, and the differential pressure gauge 65c is configured to measure the differential pressure between the front chamber 45 and the B chamber 43. There is.

The differential pressure value ΔP from these differential pressure gauges 65a, 65b, 65c is input to the programmable controller 67. The programmable controller 67 has an input / output interface with connected devices and also has an interface with the fuzzy inference unit 69.

FIG. 2 shows a programmable controller 67.
The details of the room pressure control device having the fuzzy inference unit 69 are shown. Reference numeral 71 denotes an input signal processing unit arranged in the programmable controller 61, and the input signal processing unit 71 includes differential pressure gauges 65a, 65b, 6
The differential pressure value ΔP from 5c is input.

Reference numeral 73 indicates a damper opening holding unit, and this damper opening holding unit 73 is an input signal processing unit 71.
The differential pressure value ΔP is input, and when at least one of the differential pressure values ΔP is in the vicinity of 0 and 0, the differential pressure value ΔP = 0 is output to the output signal processing unit 75, which will be described later, and all pressure adjustments are performed. The opening degrees of the exhaust dampers 63a, 63b, 63c are maintained as they are.

On the other hand, when the differential pressure value ΔP is not all 0 or near 0, the differential pressure value ΔP from the input signal processing unit 71 is obtained.
Is output to the fuzzy inference unit 69. In addition, the damper opening holding portion 73 is provided with high airtight dampers 55a, 55a on the air supply side.
b, 55c and the exhaust side high airtight dampers 61a, 61b,
When 61c is closed and any of the front chamber 45, the A chamber 41, and the B chamber 43 is sealed, that is, when the operation is stopped, a sealing signal is input and the sealing is released when the sealing is released. A signal is input.

Reference numeral 69 indicates a fuzzy inference unit, which receives the differential pressure value ΔP from the input signal processing unit 71 and uses a predetermined fuzzy rule and membership function. The opening correction amount ΔM of the pressure adjusting exhaust dampers 63a, 63b, 63c for adjusting the pressures in the front chamber 45, the A chamber 41, and the B chamber 43 is obtained by fuzzy reasoning.

Reference numeral 75 indicates an output signal processing unit arranged in the programmable controller 67. The output signal processing unit 75 inputs the opening correction amount ΔM from the fuzzy inference unit 69 and corrects the opening correction amount. Based on the amount ΔM, the pressure adjustment exhaust dampers 63a, 63b, 63c are calculated by the following equation.
The opening M of the valve is calculated, and the pressure adjusting exhaust dampers 63a, 63
b, 63c to the control unit.

M = ΔM · G + Mb (1) where G is the control gain and Mb is the previous opening. The fuzzy inference unit 69 is preset with fuzzy rules (1) to (5) described below.

(1) When the differential pressure value ΔP is "low", the pressure adjusting exhaust dampers 63a, 63b, 63c are "closed". (2) When the differential pressure value ΔP is “slightly low”, the pressure adjusting exhaust dampers 63a, 63b, 63c are “slightly closed”.

(3) When the differential pressure value ΔP is "just right", the pressure adjusting exhaust dampers 63a, 63b, 63c are "not moved". (4) When the differential pressure value ΔP is “slightly high”, the pressure adjusting exhaust dampers 63a, 63b, 63c are “slightly opened”.

(5) When the differential pressure value ΔP is "high", the pressure adjusting exhaust dampers 63a, 63b, 63c are "opened". 3 and 4 show a membership function preset in the fuzzy inference unit 69. FIG. 3 shows a membership function of the differential pressure value ΔP which is an input, and the horizontal axis represents
The differential pressure value ΔP is plotted on the vertical axis, and the fitness is plotted on the vertical axis.

FIG. 4 shows the membership function of the opening correction amount ΔM which is the output, and the horizontal axis shows the opening correction amount ΔM.
The vertical axis represents the goodness of fit. In the fuzzy inference section described above, for example, when the differential pressure value ΔP is 2 mmAq, as shown in FIG.
(A), the degree of conformity is obtained, the area is obtained based on the degree of conformity, and as shown in (c), the opening correction amount ΔM is -0.1% using the center of gravity method. Is required as.

The opening correction amount ΔM thus obtained
Is output to the output signal processing unit 75, and the above equation (1)
Based on the pressure control exhaust dampers 63a, 63b, 63
The opening degree of c is obtained.

FIG. 6 is a flow chart showing the operation of the damper opening holding section 73 described above.
It is determined whether or not the sealing signal for 1 is input (step S1), and when it is input, the differential pressure value ΔP
The value of (A) is set to ΔP (A) ≠ 0 (step S2).

Next, it is judged whether or not the sealing signal for the B chamber 43 is inputted (step S3), and when it is inputted, the value of the differential pressure value ΔP (B) is ΔP (B) ≠.
It is set to 0 (step S4).

Thereafter, the differential pressure value ΔP (previous), the differential pressure value ΔP
(A), it is determined whether or not the value of the differential pressure value ΔP (B) is 0 or in the vicinity thereof (steps S5, 6, 7), and at least one of the differential pressure value ΔP is in the vicinity of 0 and 0. At some time, the differential pressure value ΔP (previous) = 0, the differential pressure value ΔP (A) = 0, and the differential pressure value ΔP (B) = 0 are output to the output signal processing unit 75, and all the pressure adjusting exhaust dampers are output. 63a, 63b, 63
The opening degree of c is maintained as it is (step S
8).

On the other hand, when the differential pressure values ΔP are not all 0 and in the vicinity of 0, the differential pressure value ΔP from the input signal processing section 71 is obtained.
Is output to the fuzzy inference unit 69 (step S
9). Therefore, in the above-described room pressure control device, any one of the doors 45a, 41a, 43a is opened, and the differential pressure value ΔP of any one of the differential pressure gauges 65a, 65b, 65c.
However, since the opening degree of all the pressure adjusting exhaust dampers 63a, 63b, 63c is maintained as it is at 0 and in the vicinity of 0, the doors 45a, 41 are closed as in the conventional case.
While opening a and 43a, exhaust damper 6 for pressure adjustment
3a, 63b, 63c do not move to the fully closed side in order to keep the chamber pressure, and the front chamber 45, the A chamber 41 and the B chamber 43
When opening and closing the doors 45a, 41a, 43a of the vehicle, as shown in FIGS. 7 and 8, the front chamber 45, the A chamber 41 and the B chamber 43
The internal pressure does not fluctuate significantly.

In FIGS. 7 and 8, the front chamber 4
5. The room pressures of the A room 41 and the B room 43 are all the pressure difference between the corridor 47 and the corridor 47, and the room pressure is 2 mmAq between the corridor 47 and the front room 45, and between the A room 41 and the front room 45. Is set to 3 mmAq, and the B chamber 43 and the front chamber 45 are set to 3 mmAq.

FIG. 7 shows changes in the inter-room differential pressure when the door 45a between the corridor 47 and the antechamber 45 is opened and closed, for example, when a person goes in and out, or when equipment is carried in.
Immediately after the door 45a between the front chamber 45 and the front chamber 45 is opened, the chamber pressure of the front chamber 45 becomes 0 mmAq, but at the same time, all the pressure control exhaust dampers 63a, 63 of the front chamber 45, the A chamber 41, and the B chamber 43.
Since the openings of b and 63c are maintained, the A chamber 41 and the B chamber 4
The room pressure with 3 is kept as it is. Immediately after the door 45a is closed, the chamber pressure of the front chamber 45 quickly returns to the set value, and steady control is performed without overshoot.

FIG. 8 shows the door 41 between the front chamber 45 and the A chamber 41.
This shows a change in the pressure difference between the chambers when a is opened and closed. Immediately after opening the door 41a, the chamber pressures of the front chamber 45 and the A chamber 41 become equal to each other, which is about 4 mmAq with respect to the corridor 47. However, the B chamber 43 is not affected by this, and the chamber pressure does not change. After the door 41a is closed, the front chamber 45,
Room A 41 is quickly restored to the set value, and is well controlled.

In FIG. 9, the chamber A 41 is closed by closing the air supply side high airtight damper 55b and the exhaust side high airtight damper 61b.
In this case, a sealing signal is input to the damper opening holding portion 73, the differential pressure value ΔP (A) of the A chamber 41 is set to ΔP (A) ≠ 0, Since the chamber A 41 is separated from the controls of the other chambers, the differential pressure value ΔP
Even if (A) becomes 0, the front chamber 45 and the B chamber 43 are normally controlled.

In addition, by outputting a sealing release signal, the chamber A 41
When the closed state is released, ΔP (A) ≠ 0 is released, and as shown in FIG. 10, the normal control is performed and good control is performed.

FIG. 11 shows another embodiment of the room pressure control device of the present invention. In this embodiment, the damper opening holding section 73 is not provided, and the fuzzy inference section 81 is provided with a damper. A function of operating the opening degree holding unit 73 is provided.

That is, in this embodiment, the fuzzy inference unit 81 is provided with a fuzzy rule 83 for normal control and a membership function 85, and further, a fuzzy rule 87 and membership function 8 for judging door opening / closing.
9 is provided.

In this embodiment, as the fuzzy rule 87 for judging the opening / closing of the door, when the "at least one of the doors 45a, 41a, 43a is opened", the pressure adjusting exhaust dampers 63a, 63b, 63c are "not moved". The rule is set.

FIG. 12 shows a membership function 89 for judging whether the door is open or closed. FIG. 13 is a flowchart showing the operation of the room pressure control device of this embodiment. In this embodiment, a differential pressure signal is output to the fuzzy inference unit 81 in step S5.

Further, in step S9, the opening correction amount ΔM of the pressure adjusting exhaust dampers 63a, 63b, 63c is determined. At this time, the front chamber 45, the A chamber 41,
Differential pressure value ΔP (front), ΔP (A), ΔP (B) in chamber B 43
Is not at 0 and in the vicinity thereof, and is, for example, as shown in FIG.

Further, in step S10, the opening correction amount ΔM (previous) = 0, the opening correction amount ΔM (A) = 0, and the opening correction amount ΔM (B) = 0 are output to the output signal processing unit 75. To be done.

At this time, the front chamber 45, the A chamber 41,
Differential pressure value ΔP (front), ΔP (A), ΔP (B) in chamber B 43
At least one of them, for example, as shown in FIG. 15, the differential pressure value ΔP (A) of the A chamber 41 is zero.

Also in this embodiment, it is possible to obtain substantially the same effects as the above-mentioned embodiments.

[0054]

As described above, in the room pressure control device of the first aspect, any one of the doors is opened so that the differential pressure value of any one of the differential pressure gauges becomes 0 or near 0. Then,
Since the opening degree of all the pressure adjusting dampers is maintained as it is, the fluctuation of the room pressure when opening and closing the door can be significantly reduced as compared with the conventional case.

Further, in the room pressure control device according to the second aspect, even if the differential pressure value of the space in the stopped state becomes 0 or near 0, this does not affect the control of other spaces. There is an advantage that other rooms can be controlled normally while the space in the stopped state is separated.

[Brief description of drawings]

FIG. 1 is a piping system diagram showing an example of an air conditioner equipped with an embodiment of a room pressure control device of the present invention.

FIG. 2 is a block diagram showing details of the room pressure control device of FIG.

FIG. 3 is an explanatory diagram showing a membership function of differential pressure values set in the fuzzy inference unit of FIG.

4 is an explanatory diagram showing a membership function of an opening correction amount set in the fuzzy inference unit in FIG. 1. FIG.

FIG. 5 is an explanatory diagram showing how to determine an opening correction amount when the differential pressure value is 2 mmAq.

FIG. 6 is a flow chart showing an operation of a damper opening holding portion.

FIG. 7 is an explanatory diagram showing changes in pressure in each room when the door of the air conditioner of FIG. 1 is opened and closed.

FIG. 8 is an explanatory diagram showing changes in pressure in each room when the door of the air conditioner of FIG. 1 is opened and closed.

9 is an explanatory diagram showing fluctuations in pressure in each chamber when the chamber A is closed in the air conditioner of FIG.

FIG. 10 is an explanatory diagram showing a change in pressure in each chamber when the airtightness of the chamber A is released in the air conditioner of FIG. 1.

FIG. 11 is a block diagram showing another embodiment of the room pressure control device of the present invention.

12 is an explanatory diagram showing a membership function for opening and closing the door of FIG.

13 is a flowchart showing the operation of the fuzzy inference unit shown in FIG. 11.

14 is an explanatory diagram showing differential pressure values input to the membership function of FIG.

15 is an explanatory diagram showing differential pressure values input to the membership function of FIG.

FIG. 16 is a piping system diagram showing a conventional air conditioner.

FIG. 17 is an explanatory diagram showing pressure fluctuations in each room when the door of the air conditioner of FIG. 16 is opened and closed.

FIG. 18 is an explanatory diagram showing changes in pressure in each room when the door of the air conditioner of FIG. 16 is opened and closed.

[Explanation of symbols]

 41 A room 41a, 43a, 45a Door 43 B room 45 Front room 47 Corridor 63a, 63b, 63c Pressure adjustment exhaust damper 65a, 65b, 65c Differential pressure gauge 67 Programmable controller 69, 81 Fuzzy reasoning section 71 Input signal processing section 73 Damper Opening degree holding unit 75 Output signal processing unit

[Procedure amendment]

[Submission date] May 13, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Figure 3]

[Figure 4]

[Figure 5]

[Fig. 2]

[Figure 6]

[Figure 7]

[Figure 8]

[Figure 9]

[Fig. 12]

FIG. 14

[Figure 10]

FIG. 15

FIG. 16

FIG. 17

FIG. 18

FIG. 11

[Fig. 13]

Claims (2)

[Claims] 1. A plurality of spaces arranged adjacent to each other and communicated by a door, a plurality of differential pressure gauges for measuring a differential pressure between each of the spaces adjacent to these spaces, and a difference from the differential pressure gauge. A fuzzy inference means that inputs a pressure value and obtains the opening correction amount of a plurality of pressure adjusting dampers that adjust the pressure in each space by a fuzzy inference using a predetermined fuzzy rule and a membership function. Inputting the opening correction amount, inputting an output signal processing means for calculating and outputting the opening of each of the pressure adjusting dampers based on the opening correction amount, and inputting differential pressure values of the plurality of differential pressure gauges. However, when at least one of the plurality of differential pressure values is 0 or in the vicinity of 0, a damper opening degree holding means for holding the opening degree of all the pressure adjusting dampers as they are is provided. Room Pressure control device. 2. The damper opening holding means according to claim 1, wherein when there is a space in which the operation is in a stopped state in the plurality of spaces, the differential pressure value of the space in the stopped state is 0 or near 0. The room pressure control device is characterized in that the opening of the pressure adjusting damper in the other space is not kept as it is even when the pressure becomes low.