JPS6356451B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an air supply/exhaust control method for maintaining each of a plurality of rooms within the same air system at a specific room pressure. Supply and exhaust for multiple rooms such as processing rooms, microbial laboratories, pressurization and decompression rooms, etc. to maintain the air pressure difference between indoors and outdoors necessary for maintaining cleanliness, preventing contamination diffusion, and testing, etc. It is related to the control method.

As is already known, in order to maintain indoor cleanliness, in addition to cleaning the supply air, the indoor pressure is maintained at a pressure higher than the outdoor pressure, that is, positive pressure, and the inflow of contaminated air from the outdoors is prevented. Normally, the pressure difference required for this is on the order of several mm of water column. On the other hand, if there is a pollution source that generates heat, dust, harmful gas, moisture, odor, etc. indoors, it is necessary to maintain the indoor pressure at a negative pressure to prevent the spread of pollution. In addition, the room must be kept clean, and when contamination occurs, the pressure in the room must be maintained at a positive pressure, and the area near the source of the pollution must be kept at a negative pressure compared to the indoor pressure. Thus, in a single system with one chamber in the same air system, it is easy to maintain the one chamber at a specific indoor pressure and change the specific indoor pressure as necessary. However _, in the conventional air _supply /exhaust control system for multiple rooms in the same air system, as shown in the system diagram of _FIG . They are connected by a common air system consisting of the branch air supply pipes 111, 112, the branch return air pipes 131, 132, and the main return air pipe 130 with the intake pipe ₁₄₀ , and are in _the same system. machine v ₂ , v ₃ and
v ₄ is provided, and the speed regulator v ₀ of the air supply device v ₁ is controlled by the differential pressure detector p ₀ provided in one room x ₂ , so (a) one If there is a fluctuation in the exhaust volume in a room, it will affect the supply/exhaust system in all rooms, causing the room pressure to fluctuate, and in some cases, even though it is intended to maintain a positive pressure, the fluctuation in the room may occur. This may result in negative pressure. (b) All rooms can only have the same pressure. (c) In order to prevent fluctuations in the chamber pressure in each chamber and maintain each chamber at a specific chamber pressure, there is a drawback that energy is wasted because the amount of intake air must always match the maximum exhaust amount.

The present invention has been made to solve the above-mentioned drawbacks, and provides energy-saving air supply/exhaust control that can maintain each of a plurality of rooms in the same air system at a specific room pressure and requires an intake volume equal to the exhaust volume. The purpose is to provide a method.

The present invention has the following features: (A) multiple rooms are connected through a common air system so that they are in the same system, (B) the amount of air supplied from the air supply device to each room is a specific constant amount, and (C) each room is When the exhaust volume is set at any time for each room depending on the work content, operation, load level, etc., the required exhaust volume for that room is gradually reached with a predetermined delay, and then after the exhaust from each room is combined. (D) Detects the static pressure in each room to control the exhaust machine to maintain the required exhaust volume in each room, and (D) detects the pressure in each room to determine the amount of return air returned from each room to the air supply machine via the air chamber. and gradually control it with a predetermined delay, and detect the pressure in the air chamber so that the amount of intake air to be drawn into the air supply machine through the air chamber becomes equal to the displacement amount of the exhaust machine. (E) maintain a specific indoor pressure for each chamber at all times without being affected by changes in exhaust volume made by multiple chambers in the same system from time to time; (F) and for each of said chambers. This is an air supply/exhaust control method that maintains a specific indoor pressure in each of a plurality of rooms in the same air system when the specific indoor pressure is changed and specified as necessary.

Hereinafter, the present invention will be explained in detail with reference to the system diagram of the present invention shown in FIG.

Multiple chambers X ₁ between air supply machine V ₁ and exhaust machine V ₂ ,
_{X 2 , X 3} , _. Trachea 11, 12, 1
3, and the exhaust ports 24, 25, 26 of each chamber X ₁ , X ₂ , X ₃ and the main exhaust pipe ₂ of the exhaust machine V 2
0 with branch exhaust pipes 21, 22, 23,
Return air ports 3 for each room X ₁ , X ₂ , X ₃
A _{plurality of chambers} , X ₂ , and X ₃ are in the same system and communicate through the same air system. Reference numeral 1 denotes a motor damper with a delay circuit installed in the main air supply pipe ₁₀ , which prevents the indoor pressure of each chamber X ₁ , X _{2 , and 1} and a predetermined delay (delay in this specification does not mean delaying the start of operation, but rather extending the operation time to prevent sudden changes and suppress changes as flat as possible, i.e., soft start). ), which gradually opens up. In order to control the room pressure in each room, the branch air supply pipes 11, 12, and 13 are provided with constant air supply valves 51, 52, and 53, respectively, and the branch exhaust pipes 21, 22, and 23 are provided with delay valves, respectively. Variable air volume valve for exhaust with circuit 61, 62,
63 is provided, and branch return air pipes 31, 32, 33
Each has a variable return air volume valve 7 with a delay circuit.
1, 72, 73 are provided, air chamber V ₃
The intake pipe 40 is provided with an intake variable air volume valve 41. S ₁ , S ₂ , and S ₃ are air volume setting devices for setting the exhaust volume at any time for each room X ₁ , X ₂ , and X ₃ according to the respective work content, operation, load level, etc. . The air volume setting devices S ₁ , S ₂ , and S ₃ may be placed in the respective rooms X ₁ , X ₂ , and X ₃ as shown in the figure, or may be placed at appropriate locations outside the room. Air volume setting device S ₁ ,
When S ₂ and S ₃ are operated separately, depending on the signal,
In addition, the opening degree of each exhaust variable air volume valve 61, 62, 63 is gradually adjusted with a predetermined delay. The rapid opening and closing of the valves 61, 62, and 63 greatly fluctuates the pressure in the chamber, and also affects the branch exhaust pipe, the main exhaust pipe, and the pressure inside each chamber, so the opening and closing of the valves has a certain delay. It is done gradually. _p5 is a pressure regulator that detects the differential pressure between the static pressure in the main exhaust duct 20 and the set pressure, and the detection signal of the pressure regulator _p5 is used to control the regulator _c2 and the rotation speed controller _V4. The rotational speed of the exhaust machine V ₂ is controlled through the main exhaust pipe 20 to keep the static pressure in the main exhaust pipe 20 almost constant at all times so as not to affect the exhaust volume of each chamber. p ₂ , p ₃ , p ₄ are each room X ₁ ,
_A pressure regulator that detects _the differential pressure _between the pressure in X _{2 and} The opening degree of each of the return air variable air volume valves 71, 72, and 73 is gradually adjusted to prevent the room from becoming unstable due to sudden changes in the valve opening degree. p ₁ is a pressure regulator that detects the differential pressure between the pressure inside the air chamber V ₃ and the set pressure, and the variable air volume for intake is controlled via the regulator c ₁ based on the differential pressure detection signal of the pressure regulator p ₁ . valve 4
The pressure inside the air chamber V3 is kept almost constant by adjusting the opening degree of the air chamber _V3 , so as not to affect the amount of return air in each chamber. The pressure regulators p ₁ and p ₅ allow the intake air amount Q ₁ of the air supply device V ₁ to change by the same amount as the displacement amount Q ₂ of the exhaust device V ₂ changes.
In addition, if thermal treatment is required for the air in each room, the main air supply pipe 10 or the branch air supply pipe 1
Air conditioners can be inserted at 1, 12, and 13.

Next, when you start air supply machine V ₁ and exhaust machine V ₂ ,
The motor damper 1 with a delay circuit is linked to the air supply machine V ₁ and gradually opens with a predetermined delay, and the air in the air chamber V ₃ is branched into the main return air pipe 30, the air supply machine V ₁ , and the main air supply pipe 10. The air is circulated through the air supply pipes 11, 12, 13, the respective chambers _X1 , _X2 , _X3, and the branch return air pipes 31, 32, 33 to the air chamber _V3 . Each room X ₁ , X ₂ ,
The amount of air supplied _to
2 and 53 are respectively specified constant amounts. When the air supply unit V ₁ is started, the motor damper with a delay circuit gradually opens with a predetermined delay.
The pressure in each chamber does not rise rapidly and fluctuate significantly. Pressure regulators p ₂ , p ₃ for each chamber X ₁ , X ₂ , X ₃ ,
The opening degrees of the return air variable air volume valves 71, 72, and 73 with delay circuits are gradually adjusted with a predetermined delay based on the differential pressure detection signal of _p4 , so that the pressure in each chamber is Does not wobble too much. In addition, each room
Air chamber where return air from X ₁ , X ₂ , and X ₃ joins
The pressure difference between the pressure in V ₃ and the set pressure of pressure regulator p ₁ is detected by pressure regulator p ₁ , and the differential pressure is detected via regulator c ₁ by the differential pressure detection signal of pressure regulator p ₁ . Since the opening degree of the intake variable air volume valve 41 is adjusted, the pressure inside the air chamber _V3 is always kept almost constant by the pressure regulator _p1 , so it does not affect the return air volume of each chamber. . In this manner, the pressure in each chamber X ₁ , X ₂ , X ₃ is maintained at the chamber pressure specified for each chamber by the pressure regulators p ₂ , p ₃ , p ₄ . The room pressure specified for each room is adjusted using a pressure regulator p ₂ , as necessary.
By changing the set pressures of p ₃ and p ₄ , the specific room pressure after the change can be maintained in the same manner as described above.

Next, the air volume is set at any time for each room X ₁ , X ₂ , and X ₃ according to the work content, operation, load level, etc., and the air volume setting devices S ₁ , S ₂ , and S ₃ are used. When operated separately, variable air volume valve for exhaust with delay circuit 6
1, 62, and 63 are gradually adjusted with a predetermined delay, the pressure in the corresponding chamber does not fluctuate greatly, and the pressure in each branch exhaust pipe, main exhaust pipe, and other chambers is adjusted. It has no impact. Furthermore _, the static pressure after the combined exhaust _gas from each chamber X ₁ , X _{2 ,} and Therefore, the exhaust machine V 2 is detected by the differential pressure detection signal of the pressure regulator P ₅ via the regulator C ₂ and the rotation speed controller V _{4 .}
Since the rotational speed of the main exhaust pipe 20 is controlled, the static pressure in the main exhaust pipe 20 is always kept almost constant by the pressure regulator _p5 , so that it does not affect the exhaust volume of each chamber. As described above, the exhaust volume of each room set for each room by the air volume setting devices S ₁ , S ₂ , and S ₃ is discharged to the outside of the system as the exhaust volume Q ₂ by the exhaust machine V ₂ . . Q ₂ to outside the system
As the amount of exhaust gas is discharged, each chamber X ₁ , X ₂ ,
Although the indoor pressure of X ₃ each decreases, the pressure regulator p ₂ ,
The opening degrees of the return air variable air volume valves 71, 72, 73 are gradually reduced with a predetermined delay by the differential pressure detection signals of p ₃ and p ₄ , and the return air returns from each chamber to the air chamber V ₃ . The amount decreases by an amount commensurate with the displacement Q ₂ ,
Although the indoor pressure inside the air chamber _V3 decreases, the opening degree of the intake variable air volume valve 41 is adjusted via the regulator _c1 in response to the differential pressure detection signal of the pressure regulator _p1 , and the above-mentioned displacement _{Q2 is} increased. By taking in an equal amount of air and supplying a specific fixed amount of air to each room, the indoor pressures of each room X ₁ , X ₂ , and X ₃ can be specified without being influenced by each other. The room pressure is maintained at . Even if there is a change in the displacement amount, that is, there is a disturbance due to the opening and closing of a door instead of an internal disturbance,
Similarly to the above, the return air volume and intake air volume are automatically controlled by the pressure regulators p ₂ , p ₃ , p ₄ and p ₁ , and the indoor pressure of each chamber is maintained at a specific level without being influenced by each other. The room pressure is maintained at a constant level.

If the indoor pressure fluctuates only due to internal disturbances, the intake air volume Q ₁ will be approximately equal to the exhaust volume Q ₂ , and if the indoor pressure fluctuates only due to disturbances, the intake air volume Q ₁
is the above displacement Q ₂ plus the loss amount (positive when flowing out,
(becomes negative when there is an inflow). By gradually adjusting the opening degrees of the variable air volume valves for return air and exhaust with a predetermined delay, even if there are internal disturbances or external disturbances, a balance can always be achieved smoothly, and the indoor pressure can be maintained. Because fluctuations are suppressed, the indoor pressure is always maintained with high precision.Furthermore, the static pressure after the exhaust gas from each chamber joins and the pressure inside the air chamber where the return air from each room joins are both kept constant. There is no effect on the other rooms, and a specific indoor pressure is maintained for each room.

As can be easily understood from the above explanation,
The present invention sets the amount of air supplied to each of a plurality of rooms in the same system to be a specific fixed amount, and exhausts air from each room with a predetermined delay, and influences the exhaust air from other rooms. The return air from each room is gradually brought in with a predetermined delay without affecting the return air from other rooms, and the amount of intake air changes equally as the exhaust volume changes. This air supply/exhaust control system allows (1) multiple rooms to be covered by the same air system, (2) a specific room pressure (which may be different for each room) to be maintained in each room, and ( 3) Room pressure is variable, (4) Smoothly copes with internal disturbances and external disturbances and has high accuracy without fluctuations in indoor pressure, (5) Not affected by internal disturbances and external disturbances in other rooms, (6) Displacement volume. The amount of intake air required is equal to , and the effect of energy saving with minimum energy consumption can be achieved.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a conventional air supply/exhaust control system for multiple rooms in the same air system, and FIG. 2 is a system diagram of the present invention. Q ₁ ; intake volume, Q ₂ ; exhaust volume, V ₁ ; air supply machine, V ₂ ;
Exhaust machine, V ₃ ; Air chamber, V ₄ ; Rotation speed controller,
X ₁ , X ₂ , X ₃ ; chamber, c ₁ , c ₂ ; regulator, p ₁ , p ₂ , p ₃ ,
p ₄ , p ₅ ; Pressure regulator, S ₁ , S ₂ , S ₃ ; Air volume setting device,
1: Motor damper with delay circuit, 10; Main air supply pipe, 11, 12, 13; Branch air supply pipe, 14, 1
5, 16; Air supply port, 20; Main exhaust pipe, 21, 2
2, 23; Branch exhaust pipe, 24, 25, 26; Exhaust port, 30; Main return pipe, 31, 32, 33; Branch return pipe, 34, 35, 36; Return port, 40; Intake pipe, 41; Variable air volume valve for intake, 51, 52, 5
3; Constant air volume valve for supply air; 61, 62, 63; Variable air volume valve for exhaust air with delay circuit; 71, 72, 73; Variable air volume valve for return air with delay circuit.

Claims (1)

[Scope of Claims] 1. A plurality of rooms are connected through a common air system so that they are in the same system, the amount of air supplied from the air supply device to each room is a specific constant amount, and the work content is determined separately for each room. When the exhaust volume is set at any time depending on the operating or load level, the required exhaust volume for the room is gradually reached with a predetermined delay, and the static pressure after the exhaust gas from each room is combined is detected. The system controls the exhaust machine to maintain the required exhaust volume in each room, and detects the pressure in each room to determine the amount of return air returned to the air supply machine from each room via the air chamber, and after a predetermined delay. In addition to gradually controlling the amount of intake air to be taken into the air supply machine through the air chamber, the pressure in the air chamber is detected and controlled so that it is equal to the displacement amount of the exhaust machine, so that Each room is maintained at a specific indoor pressure at all times without being affected by changes in exhaust volume from time to time in multiple rooms, and the specific indoor pressure is changed and specified for each room as necessary. An air supply/exhaust control method that maintains each of multiple chambers in the same air system at a specific indoor pressure.