JP3309931B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner used for air conditioning in a sterile animal breeding room, a bio-clean room, etc., and in particular, to reduce room pressure fluctuations during disinfection and exhaustion performed after disinfecting a room. It relates to an air conditioner.

[0002]

2. Description of the Related Art In general, in a facility such as a bioclean room for manufacturing pharmaceuticals or an animal breeding room for conducting experiments and research using sterile animals, the inside of the room is kept clean and bacteria are kept from outside. It is necessary to surely prevent the invasion of pathogens, and in the air conditioning of such a facility, the pressure inside the room is made higher than the pressure outside the room, thereby forming a barrier to the outside.

In such a facility, when the content of an experiment is changed or when a manufacturing line is changed, the inside of the room is sealed and the room is disinfected by formalin fumigation. ing.

FIG. 5 shows an air conditioner of such a facility. In the figure, reference numeral 11 denotes a plurality of rooms such as a sterile animal breeding room and a bioclean room. In these rooms 11, air supply ducts 15 for guiding the air from one air supply fan 13 into the room 11 are respectively opened.

[0005] A constant air volume device 17 and a supply-side high airtight damper 19 are arranged in the supply line 15 in this order from the upstream side. Each room 11 has an exhaust pipe 23 for guiding air from the room 11 to one exhaust fan 21.
Is open.

In these exhaust pipes 23, an exhaust-side high airtight damper 25 and a pressure adjusting exhaust damper 27 are arranged in order from the upstream side. In the air conditioner described above, the air supply fan 13 and the exhaust fan 21
Is operated at a constant rotational speed, and the supply-side high airtight damper 19 and the exhaust side high airtight damper 25 are fully opened.

[0007] The controller 29 operates the constant air volume device 17 with its opening adjusted to maintain the set air volume. Further, the pressure inside the room 11 is maintained so as to have a predetermined pressure difference from the pressure outside the room 11 by automatically adjusting the opening of the pressure adjustment exhaust damper 27 by the differential pressure regulator 31. .

On the other hand, when disinfecting a certain room 11, as shown in FIG. 6B, the supply-side high airtight damper 19 and the exhaust side high airtight damper 25 are completely closed, and the room 1 is closed.
Disinfection by formalin fumigation is performed in a state where 1 is sealed, and thereafter, the supply-side high airtight damper 19 and the exhaust side high airtight damper 25 are fully opened, and the disinfectant is exhausted from the room 11.

[0009]

However, in such a conventional air conditioner, when the disinfectant is exhausted from the room 11, the pressure in the room 11 fluctuates greatly as shown in FIG. However, there is a problem that the pressure difference between the inside of the room 11 and the outside of the room 11 becomes larger than the pressure difference set at the normal time, for example, 3 mm water column, and there is a possibility that the air in the room 11 leaks outside. Was.

That is, in the conventional air conditioner, when the air supply side high airtight damper 19 is closed at the time of disinfection, the constant air volume device 17
Are fully opened in order to secure the air volume, and when the supply-side high airtight damper 17 and the exhaust side high airtight damper 25 are opened at the time of disinfecting and exhausting, these dampers 17, 25 are opened.
When the room opens, a large amount of air flows into the room 11 and the room 1
There is a problem that the pressure in the room 1 becomes excessively positive and the pressure in the room 11 fluctuates greatly.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an air conditioner capable of greatly reducing room pressure fluctuation during disinfection and exhaustion.

[0012]

An air conditioner according to the present invention comprises a plurality of air supply pipes for guiding air from one air supply fan to a plurality of rooms, and the air supply pipes are arranged in the air supply pipes in order from the upstream side. A constant air volume device and a supply-side high airtight damper, a plurality of exhaust pipes for guiding air from the plurality of rooms to one exhaust fan, and these exhaust pipes are arranged in order from the upstream side. An exhaust-side high airtight damper and a pressure adjusting exhaust damper; a controller for setting an air volume of the constant air volume device and adjusting an opening degree of the constant air volume device so as to maintain the set air volume; and the pressure adjusting exhaust gas. A differential pressure regulator for automatically adjusting the opening degree of the damper to maintain a differential pressure between the pressure inside the room and the pressure outside the room at a predetermined value, wherein the air supply side high airtight damper and the exhaust side height are provided. Turn off the room with the airtight damper closed After that, disinfection and exhaust control means used when exhausting the inside of the room is provided, and the disinfection and exhaust control means sets the air volume setting of the constant air volume device with the constant air volume device fully closed. and small air volume setting means for setting smaller than the constant air flow, the when the constant air volume system with air amount set by the small air volume setting means is actuated simultaneously, previously
A damper fully opening means for starting an operation of fully opening the supply side high airtight damper and the exhaust side high airtight damper at a set predetermined time, and a full opening of the supply side high airtight damper and the exhaust side high airtight damper in advance. After the prescribed time elapses,
The air volume setting means comprises an air volume returning means for returning the air volume setting of the constant air volume device to the steady air volume.

[0013]

In the air conditioner of the present invention, at the time of disinfecting exhaust, the disinfecting exhaust control means is operated. First, the air volume setting of the constant air volume device is normally performed by the small air volume setting device while the constant air volume device is fully closed. It is set smaller than the air volume.

Thereafter, at the same time when the constant air volume device is operated with the air volume set by the small air volume setting device, an operation for fully opening the supply side high airtight damper and the exhaust side high airtight damper by the damper full opening device is started. Is done.

Then, after a predetermined period of time elapses after the supply-side high airtight damper and the exhaust-side high airtight damper are fully opened, the air volume setting of the constant air volume device is returned to the steady air volume by the air volume return means. .

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 1 shows an embodiment of the air conditioner of the present invention. In the figure, reference numeral 41 indicates a plurality of rooms such as a sterile animal breeding room and a bioclean room.

In these rooms 41, an air supply line 45 for guiding air from one air supply fan 43 into the room 41 is provided.
Are respectively opened. A constant air volume device 47 and a supply-side high airtight damper 49 are arranged in the supply line 45 in this order from the upstream side.

Each room 41 has an exhaust pipe 53 for guiding air from the room 41 to one exhaust fan 51.
Is open. In these exhaust pipes 53, an exhaust-side high airtight damper 55 and a pressure adjusting exhaust damper 57 are arranged in order from the upstream side.

Reference numeral 59 denotes a controller.
The controller 59 has a function of setting the air volume of the constant air volume device 47, a function of adjusting the opening degree of the constant air volume device 47 so as to maintain the set air volume, a function of fully closing the constant air volume device 47, It has a function of opening and closing the side high airtight damper 49 and the exhaust side high airtight damper 55, and a control function for continuously controlling these functions.

Reference numeral 61 denotes a differential pressure regulator. The differential pressure regulator 61 detects a differential pressure between a pressure inside the room 41 and a pressure outside the room 41 from a differential pressure detector 62. The pressure signal is input, and the opening degree of the pressure control exhaust damper 57 is set to PID.
The automatic control by the operation has a function of maintaining a differential pressure between the pressure inside the room 41 and the pressure outside the room 41 at a predetermined value.

In this embodiment, the controller 5
9 is provided with a disinfecting and exhaust control means 63 used when disinfecting the inside of the room 41 with the supply-side high airtight damper 49 and the exhaust side high airtight damper 55 closed and then exhausting the inside of the room 41. ing.

As shown in FIG. 2, the disinfecting exhaust control means 63 includes a constant air volume device fully closing device 65 and a small air volume setting device 6.
7, a damper fully opening means 69 and an air volume returning means 71. These means are provided by the CPU 73 of the controller 59.
It is provided within.

The constant air volume device fully closing means 65 fully closes the constant air volume device 47 when a room opening command is manually input to the controller 59 during disinfection and exhaust. The small air volume setting means 67 uses the constant air volume device 4
When 7 is fully closed, the air volume setting of the constant air volume device 47 is set to a value smaller than the steady air volume, for example, to a value of about 20% of the steady air volume.

The damper fully opening means 69 is provided with the small air volume setting means 6.
At the same time when the constant air volume device 47 is operated with the air volume set by 7, the operation for fully opening the supply-side high airtight damper 49 and the exhaust-side high airtight damper 55 is started.

The damper fully opening means 69 activates the timer 75 at the same time as the full opening operation of the dampers 49 and 55 is started. The air volume returning means 71 includes a supply side high airtight damper 49.
After a predetermined period of time elapses after the exhaust-side high airtight damper 55 is fully opened, the air volume setting of the constant air volume device 47 is returned to the steady air volume.

That is, the time from when the supply-side high airtight damper 49 and the exhaust side high airtight damper 55 are fully opened to when they are completely opened is set in the timer 75 in advance. After the lapse of time, a time lapse signal is input from the timer 75 to the air volume returning means 71, and the air volume returning means 71 returns the air volume setting of the constant air volume device 47 to the steady air volume by inputting this signal.

In the above-described air conditioner, in a steady state, the air supply fan 43 and the exhaust fan 51 are operated at a constant rotation speed, and the air supply damper 49 and the air discharge damper 55 are fully opened. It has been.

Also, the controller 59 operates the constant air volume device 47 with the opening adjusted so as to maintain the set air volume. Further, the pressure inside the room 41 is maintained so as to have a predetermined pressure difference from the pressure outside the room 41 by automatically adjusting the opening degree of the exhaust damper 57 for pressure adjustment by the differential pressure regulator 61. .

On the other hand, when disinfecting the inside of the room 41, FIG.
As shown in FIG. 4 and FIG. 4, first, a room closing command is manually input to the controller 59 (Step S).
1) The supply-side high airtight damper 49 and the exhaust side high airtight damper 55 are fully closed (step S2), and disinfection by formalin fumigation is performed with the room 41 sealed (step S3).

Thereafter, when the disinfection in the room 41 is completely completed, a room open command is input to the controller 59 manually (step S4), and the constant air volume device 47 is completely closed by the constant air volume device full closing means 65. (Step S5).

When the constant air volume device 47 is fully closed by the constant air volume device closing means 65, the air volume setting of the constant air volume device 47 is smaller than the steady air volume by the small air volume setting device 67, for example, The value is set to about 20% (step S6).

The constant air volume device 47 is operated with the air volume set by the small air volume setting device 67 (step S7), and at the same time, the air supply side high airtight damper 49 is provided by the damper full opening device 69.
Then, an operation of fully opening the exhaust side high airtight damper 55 is started (step S8).

Simultaneously with the start of the full opening operation of the dampers 49 and 55, the timer 75 starts counting (step S9). Then, when the timer 75 is up (step S10), the air volume setting of the constant air volume device 47 is returned to the steady air volume by the air volume returning means 71 (step S10).
11).

In the air conditioner configured as described above, when disinfecting and exhausting, as shown in FIG. 4A, the air volume of the constant air volume device 47 is set to the small air volume by the small air volume setting means 67. Then, as shown in FIG. 4B, the supply-side high airtight damper 49 and the exhaust-side high airtight damper 55 are opened, so that a large amount of air flows into the room 41 when the dampers 49, 55 are opened. As a result, as shown in FIG. 4C, the room pressure fluctuation at the time of disinfecting exhaust can be significantly reduced as compared with the related art.

Further, in the above-described air conditioner, the control means 63 for disinfecting and exhausting is incorporated in the CPU 73 to automatically control a series of operations, so that control during disinfecting and exhausting can be performed reliably. Control reliability can be improved.

In the embodiment described above, an example in which various controls are performed by the CPU 73 of the controller 59 has been described. However, the present invention is not limited to this embodiment. It goes without saying that control may be performed.

[0037]

As described above, in the air conditioner of the present invention, when disinfecting and exhausting air, the air supply side high airtight damper and the exhaust air are discharged while the air volume of the constant air volume device is set to a small air volume by the small air volume setting means. Since the side high airtight damper is opened, a large amount of air is prevented from flowing into the room when the damper is opened, and as a result, room pressure fluctuations during disinfection exhaust can be significantly reduced as compared with the conventional case.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing an embodiment of an air conditioner of the present invention.

FIG. 2 is a block diagram showing control means for disinfecting and exhausting the air conditioner of FIG. 1;

FIG. 3 is a flowchart showing an operation of the air conditioner of FIG. 1 at the time of disinfection.

FIG. 4 is an explanatory diagram showing an operation of the air conditioner of FIG. 1 at the time of disinfection.

FIG. 5 is a piping diagram showing a conventional air conditioner.

6 is an explanatory diagram showing an operation of the air conditioner of FIG. 5 at the time of disinfection.

[Explanation of symbols]

 41 room 43 air supply fan 45 air supply line 47 constant air volume device 49 air supply side high airtight damper 51 exhaust fan 53 exhaust line 55 exhaust side high airtight damper 57 pressure adjustment exhaust damper 59 controller 61 differential pressure regulator 63 disinfection exhaust Control means 67 small air volume setting means 69 damper full opening means 71 air volume returning means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-256743 (JP, A) JP-A-64-33447 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 7/04-7/06

Claims (1)

(57) [Claims] 1. A plurality of air supply pipes for guiding air from one air supply fan to a plurality of rooms, a constant air volume device arranged in these air supply pipes in order from an upstream side, and a high airtightness on the air supply side. A damper; a plurality of exhaust pipes for guiding air from the plurality of chambers to a single exhaust fan; an exhaust-side high airtight damper and a pressure-regulating exhaust damper arranged in the exhaust pipes in order from the upstream side A controller for setting the air volume of the constant air volume device and adjusting the opening of the constant air volume device so as to maintain the set air volume; and automatically adjusting the opening of the pressure adjusting exhaust damper, A differential pressure regulator that maintains a differential pressure between the pressure in the room and the pressure outside the unit at a predetermined value, and the inside of the room with the supply-side high airtight damper and the exhaust side high airtight damper closed. After disinfecting, exhaust the room Control means for disinfecting exhaust used when the air flow is controlled, and the disinfecting exhaust control means sets the air flow of the constant air flow device to be smaller than the steady air flow when the constant air flow device is fully closed. Setting means, at the same time when the constant air volume device is operated with the air volume set by the small air volume setting device, at the same time as a predetermined time set in advance.
In the damper fully open means for initiating the operation of fully opening the air supply side airtight damper and the exhaust-side Airtight damper, predetermined prescribed time has elapsed from the fully open to the air supply side airtight damper and the exhaust-side airtight damper And an air volume returning means for returning the air volume setting of the constant air volume device to a normal air volume.