JPS6228375B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a general ventilation system for factories and the like that require ventilation.

Conventional ventilation methods in factories can be roughly divided into natural ventilation and mechanical ventilation (hereinafter referred to as mechanical ventilation), but in recent years mechanical ventilation has been increasingly used for the purpose of preventing pollution and improving the environment. . Mechanical ventilation is a method of using a blower or the like to exchange the air inside the factory with outside air at the required ventilation rate. As mentioned above, mechanical ventilation requires power (electricity) to use a blower and the like, and also requires power to operate heating and cooling devices in winter and summer. The energy used for these is proportional to the amount of ventilation in the factory.

On the other hand, inside a single factory, there are various sources of heat generation and pollution sources that generate dust. That is, when looking at the inside of a factory macroscopically, there are places where dust sources or heat sources are concentrated and places where they are not. Taking an automobile engine assembly factory as a specific example, this assembly factory includes a rough machining process for the engine body, a finishing process, and an engine assembly process. The presence of a heat source and the generation of contaminants are greatest in the rough machining process, and decrease in the finishing process and assembly process. In this way, even though heat sources and sources of pollutants are not evenly distributed within the factory, uniform ventilation has conventionally been achieved within the factory.

Next, to explain a conventional factory ventilation system with reference to Fig. 2, inside the factory building 1 where outside air can be shut off, there is a work area A that does not generate much dust, and a work area A that generates a large amount of dust. There is a region B. An air supply duct 2 is attached to the ceiling of the building 1 over its entire length. Work area A of building 1
An air conditioner 3 is installed on the ceiling of the building 1 adjacent to the side wall 1a.
One end of the air supply duct 2 is connected to. In addition,
The other end of the air supply duct 2 is closed. A suction duct 4 having a built-in blower 5 is connected to the air conditioner 3, and the other end of the suction duct 4 protrudes to the outside of the building 1 and serves as an intake port 6. The air supply duct 2 has air outlets 7 at the top of both working areas A and B.
A large number of branch pipes 7 having pipes a and 7b are attached in a hanging manner. The air outlet 7a is oriented diagonally downward to the left in the figure, and the air outlet 7b is oriented diagonally downward to the right. Each vertical portion 8a of the sawtooth roof 8 of the building 1 is equipped with an exhaust fan 9, which is a device for discharging air from the building 1, regardless of the working areas A and B. A and B in each work area A and B conceptually represent equipment such as machines and devices within the work area.

Then, when the air conditioner 3, the blower 5, and each exhaust fan 9 are driven, fresh outdoor air is sucked in from the intake port 6. This air passes through the air conditioner 3, where it becomes cold air or warm air, and is sent to the intake duct 2. In this way, the cold air (warm air) sent to the intake duct 2 is uniformly blown out to both the work areas A and B from both the discharge ports 7a and 7b of each branch pipe 7. The air conditioned in each work area A and B contains dust generated in work area B, and after being diffused to work area A as shown by arrow C in this figure, the air is air conditioned at each vertical part of each roof 8. 8
The air is discharged outdoors by an exhaust fan 9 attached to a. That is, in conventional ventilation systems, equipment is arranged without regard to the source of dust, etc., so that dust, etc. is likely to spread as described above, and therefore it was necessary to increase the ventilation air volume.

In view of the above, this invention makes it possible to reduce the amount of ventilation air to the entire working area compared to conventional methods, when there is a working area where little dust is generated and a working area where there is a lot of redness due to dust etc. inside a factory. The object of the present invention is to provide a ventilation system that can prevent dust from spreading to the entire work area.

Next, the present invention will be explained based on the embodiment shown in FIG.

In the figure, the factory building 1 has a working area A where less dust is generated and a working area B where more dust is generated, as in FIG. In addition, an air conditioner 3 is installed on the ceiling of the factory building 1, as shown in FIG. A suction duct 4 with an opening 6 is connected. The air supply duct 10 is the second
Like the air supply duct 2 shown in the figure, it is attached to the ceiling of the building 1, but its length is shorter than the length of the air supply duct 2, and its other closed end 10a is located within the work area A. positioned. An appropriate number of branch pipes 11 are attached to the air supply duct 10 in a hanging manner, and a branch pipe 11 is also attached to the other end 10a of the air supply duct 10 in a hanging manner. And branch pipe 1
A discharge port 7 at the lower end of the branch pipe 7 is provided at the lower end of the branch pipe 7.
Similar to a and 7b, a discharge port 11 is a supply air blowing part.
a and 11b are open. Further, an exhaust port 9a and an exhaust fan 9 for discharging the air inside the building 1 to the outside air are provided.
is attached only to the vertical part 8a of the roof 8 above the working area B, and not to the vertical part 8a of the roof 8 above the working area A.

Next, the operation of this embodiment will be explained.

When the air conditioner 3, the blower 5, and each exhaust fan 9 are operated, fresh air from the outdoors is taken in through the intake port 6. After the temperature and humidity of this air are moderately adjusted by the air conditioner 3, the air is blown out from the outlet 11a of each branch pipe 11 of the air supply duct 10 to the upper part of the work area A. Air condition the area. On the other hand, each exhaust fan 9 above the work area B
However, the polluted air containing dust generated in this work area B is sucked in and discharged to the outside of the building 1. In this way, air is discharged in the working area A in the building 1, and air is discharged in the working area B, so a change in air pressure occurs in the building 1, as shown by arrow a. An air current flows from the work area A toward the work area B. When this airflow flows from the blower outlet 11 to the outlet 9a, it becomes a smooth flow that is substantially parallel to the floor surface of the building without forming a stagnation part in the building 1. Therefore, the dust generated in the work area B is suppressed from dispersing in the direction of the work area A by this airflow, and flows in the direction of the roof 8 of the work area B as shown by the arrow b, and flows to the vertical part of the roof 8. The air is discharged to the outside of the building 1 by each exhaust fan 9 provided at 8a.

As described above, this invention divides the inside of a building such as a factory that requires air supply and exhaust for ventilation into a working area where less dust is generated and a working area where more dust is generated. Ventilation air outlets are provided in work areas where dust, etc. are generated infrequently, and air exhaust ports are provided in the upper part of the building in work areas where dust, etc. are frequently generated, thereby configuring a general ventilation system for factories, etc. This has the following effects:

(b) By blowing out ventilation air, the working area where there is little dust generation is at a higher pressure than the work area where there is a lot of dust generation. It flows naturally to the work area and is discharged to the outside from the outlet at the top of the building in the work area where dust is often generated.
Dust floating in the air in work areas where less dust is generated and dust floating in the air in work areas where more dust is generated are discharged outside the building along with the ventilation air flow inside the building. Since the air flow does not form a stagnant part, dust and the like will not be sucked into the stagnant part and remain inside the building. Therefore, it is possible to reduce the amount of ventilation air and improve the environment in the work area.

(b) Since the ventilation air volume can be reduced, the ventilation equipment can be simpler than before, and the equipment cost can therefore be reduced. Furthermore, energy such as electric power for operating the equipment can be reduced.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and is a diagram showing a general ventilation system for a factory, etc., and FIG. 2 is a diagram showing a conventional general ventilation system for a factory, etc. 1...Building, 3...Air conditioner, 5...Blower, 9...
Exhaust fan, 10... Air supply duct, 11... Branch pipe, 11
a, 11b...Air outlet, 9a...Discharge port, A...Working area where little dust etc. is generated, B...Working area where dust etc. is generated a lot.

Claims (1)

[Claims] 1. Divide the inside of a building such as a factory into a work area that generates little dust, etc. and a work area that generates a lot of dust, etc., and install ventilation air outlets in the work area that generates little dust, etc. In work areas where a lot of dust is generated, ventilation air outlets are installed at the top of the building to create a relatively low-pressure area, and natural airflow flowing from the high-pressure area to the low-pressure area is created in the building. A general ventilation system for factories, etc., characterized by the fact that