JPS62280529A - Method of forming clean zone in large space - Google Patents

Abstract

PURPOSE:To form a clean zone in a large space, by conveying an induced atmospheric air by the operation of a purified air ejector, by controlling the direction of an induced and conveyed air-flow by controlling the direction to eject an ejection flow, and by forming a purified air zone in the small portion of a large space. CONSTITUTION:A cubic box 10 is provided with an air intake opening 11 on one side and an air ejection nozzle 12 on the opposite side, and the whole box 10 is suspended by bolts 13. A fan 14 and a HEPA filter 15 are provided in the box 10. When the fan 14 is driven, an air is sucked into the box 10 from the opening 11. It is purified while it is passing through the HEPA filter 15, and is ejected from the air ejection nozzle 12. The air in the neighborhood of an ejection flow from the air ejection nozzle 12 is induced and is conveyed to the direction of an ejection flow, forming an induced and conveyed air flow. a swirl flow is produced in the center of a floor in a large space 1, forming a purified air zone 3. If any poluted substance generates or is in existence, it is blown off by the swirl flow, or is caught by the HEPA filter 15 in a purified air ejector 2, so that a clean zone can be maintained.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a technology for configuring a large space within a building into a clean room.

[Prior Art] A conventional clean room has a ceiling height of about 3 m at most, and there are few examples of clean rooms with a ceiling height of 5 to 20 m or more. This is because work equipment is installed on the floor, so there is no need for a ceiling higher than necessary, and the higher the ceiling, the more difficult it is to control the airflow.
Also, the air conditioning load becomes more excessive than necessary. Also, regardless of the height of the ceiling, in the case of a large space, it is normal to create an enclosed small room and construct it as a clean room, and it is often the case that the entire space of a large factory is converted into a clean room. This is also not normally done for the same reason as mentioned above.

[Problem that the invention seeks to solve]

It is sometimes required to configure a large space with high ceilings into a clean room. This applies when large working machines are installed, equipment where production lines are arranged vertically and logistics move up and down the room, and even existing high ceiling rooms (non-clean rooms such as tJ's factory space). This is the case when you want to use it as is in a clean room without making any major changes.

However, constructing an entire room with such a large space into a laminar flow clean room requires extremely large equipment costs and operating costs. Furthermore, it is difficult to maintain the entire room at a high level of cleanliness even if it costs a lot of money, and if there is only a limited work area that requires a high level of cleanliness, there is a lot of waste. occurs.

The present invention has been made to solve such problems.

[Means to solve problems]

The present invention provides one or more purified air ejectors, each of which has a fan and a HEPA filter installed in a box provided with an air intake opening and an air injection nozzle, in a large space to which clean conditioned air is supplied. By operating this purified air ejector, the surrounding air is attracted and transported in the direction of the eject flow, and the direction of the induced air flow is regulated by regulating the injection direction of the eject flow, and the direction of the induced air flow is regulated. The present invention provides a method for forming a clean zone in a large space, which is characterized by forming a small area in the large space as a clean air zone according to the regulations.

The basic principle of the present invention is to supply supply air of clean conditioned air to a large space to form the entire large space into an air-conditioned purified space, and to convert the air in this space into purified air installed in the large space. It uses an ejector to create a highly clean area in a specific area within a large space, and the purified air ejector controls the conveying airflow and diffuses contaminated air into the large space. The basic feature is that only specific areas are made into highly clean areas.

The contents of the present invention will be specifically explained below with reference to the drawings.

FIG. 1 shows an example in which a clean zone 3 is formed in a central floor 2 by appropriately arranging a purified air ejector 2 according to the present invention inside a large space 1 with a high ceiling. In the large space 1, air conditioned by an air conditioner 4 is blown out after being purified by an EPA filter unit 6.
From there, the air is returned to the air conditioner 4, and the air conditioner 4 is supplied with outside air (0, A). In this way, by circulating and supplying purified conditioned air into the large space 1, the entire large space 1 is formed into a somewhat harmonized and purified atmosphere.

In the present invention, a necessary number of purified air ejectors 2 are installed at appropriate positions within such a large space 1. This purified air ejector 2 has a function of sucking in ambient air, purifying it, and then injecting it, as will be explained later in FIGS. 4 and 5, and is equipped with a fan and a HEPA filter. When the air is ejected from this purified air ejector 2, the surrounding air is attracted to this eject flow, and the surrounding air is conveyed in the eject direction at an air volume several times or several tens of times as large as the ejected air volume. Become.

In the example shown in FIG. 1, four purified air ejectors 2 are installed at the middle height of a large space 1. Figure 2 is a plan view of the arrangement of the purified air ejector 2 in Figure 1;
FIG. 3 is also an elevational view. As shown,
The purified air ejector 2 is located at four corners of the large space 1 at a medium height, with its ejection direction facing slightly downward (see Fig. 3).

Then, it should be tilted so that it is almost tangential to the clean node 3 that is to be formed in the center of the floor of the large space 1 (as shown in Figure 2, a clockwise circulation flow is formed). arranged at an angle).

FIG. 4 shows an external appearance of the purified air ejector 2 according to the present invention, and FIG. 5 shows its internal cross section. As seen in FIG. 4, a one-box type box 10 has an air intake opening 11 on one side and an air injection nozzle 12 on the opposite side, and the entire box 10 is suspended by hanging bolts 13. It has a simple shape.

Inside this box IO, as shown in FIG.
is installed. More specifically, the inside of the box from the air intake opening 11 to the air injection nozzle 12 is divided by a partition plate 16, the fan 14 is installed in the upstream space divided by the partition plate 16, and the HE is installed in the downstream space.
A PA filter 15 is installed, and the outlet of the fan 14 is opened in the partition plate 16. As a result, when the fan 14 is operated, air is sucked into the box 10 from the air intake opening 11, and the HEPA filter 15
After passing through and being purified, the air is injected from the air injection nozzle 12.

Fan 14 of purified air ejector 2 configured in this way
When driven, air near the eject flow is attracted by the eject flow from the air injection nozzle 12 and is transported in the eject direction. Therefore, if the purified air ejector 2 is arranged and driven as shown in Figures 1 to 3,
An induced conveying air flow is formed in which surrounding air is conveyed to the eject flow purified by the purified air ejector 2,
This induced conveyance airflow generates a vortex in the center of the floor of the large space 1, forming a clean zone 3. That is, this clean zone 3 is always in a vortex, and even if pollutants are generated or exist in this vortex, they are blown away by the vortex, maintaining a clean area, and the pollutants are diffused into a large space, and eventually is HEP in purified air ejector 2
It will be collected by the A filter 15. At this time, the larger the volume of the space, the more the contaminants are diluted by diffusion, so the larger the space, the smaller the concentration of contaminants in the clean zone 3 due to diffusion, and the higher the cleanliness can be maintained.

Figure 6 shows a clean zone in a hollow space away from the floor in a large space 1 with a high ceiling. An example is shown in which the purified air ejector 2 is arranged so as to form a clean air ejector 2. That is, a plurality of purified air ejectors 2 are arranged to surround a hollow space, and the next purified air ejector 2 is arranged within the reach of the induced conveyance flow by the eject flow of the purified air ejectors 2, thereby creating a large space. An annular flow is formed around the middle part of the inside of 1. 7th
The figure is a plan view of air flow due to the arrangement of the purified air ejector 2. As seen in this figure, the annular flow of the induced conveyance flow generated by each eject flow generates a unidirectional vortex flow within the eject flow, thereby forming a clean zone in the hollow area surrounded by the purified air ejector 2. can do.

FIG. 7 shows an example in which a clean zone is formed in a hollow portion having substantially the same configuration as the example shown in FIG. 6 except that the number of purified air ejectors 2 is reduced. In this example, the wall surface forming the large space 1 is used to form a circulating flow.

9 and 10 show another example of a purified air ejector according to the present invention, which is lighter and more compact than that of FIGS. 4-5. That is, an annular HEP filter was installed coaxially within a cylindrical casing 17 having an air injection nozzle 12 at one end, and a fan runner 19 of a centrifugal blower was installed coaxially within this annular HEPA filter. It is something. 20
is the blower motor.

Reference numeral 21 indicates a motor support, and reference numeral 22 indicates a pre-filter.The purified air ejector in this example has a structure similar to that of a centrifugal blower cowling itself made of a HEPA filter. All the air blown out in the centrifugal direction by the outer ring 1 (
Passes through EPA filter 18.

The air flows from the annular opening 24 of the contact plate 23 toward the air injection nozzle 12 while converging, and is blown out as a jet stream. Even when the purified air ejector of the example shown in FIGS. 9 and 10 is used, a clean air zone can be formed in exactly the same manner as described with the example of the purified air ejector of FIGS. 4 and 5.

In this way, according to the present invention, only a specific small area within the large space 1 can be formed into a clean zone with high cleanliness as desired. In particular, in the case of the present invention, the air ejector itself has an air purifying function, and even if dust is generated in the clean zone formed by the induced conveyance air flow of the eject flow, it will be spread over a large space, so The higher the degree of cleanliness, the more excellent the effect of forming a clean zone, and the above-mentioned problems are effectively solved.

[Brief explanation of the drawing]

FIG. 1 is an equipment layout diagram showing an example of forming a clean zone in a large space according to the method of the present invention; FIG. 2 is a planar view of the airflow due to the arrangement of the purified air ejector shown in FIG. 1; FIG. 3 is an elevational view of the airflow due to the arrangement of the purified air ejector shown in FIG. 1, FIG. 4 is an external view showing an example of the purified air ejector according to the present invention, and FIG. 4 is a sectional view of the purified air ejector, FIG. 6 is an equipment layout diagram showing another example of forming a clean zone in a large space according to the present invention, and FIG. 7 is an arrangement of the purified air ejector of FIG. 6. Figure 8 is a plan view of the air flow due to another arrangement of the purified air ejector.
FIG. 9 is a schematic sectional view showing another example of the purified air ejector according to the present invention, and FIG. 10 is a sectional view taken along the line X--X of the purified air ejector of FIG. 9. 1. Large space, 2. Purified air ejector 3. Clean zone, 4. Air conditioner. 6.HEP＾filter unit. lO.. Box of purified air ejector, 11. Air intake circumference 0.12.. Air injection nozzle. 14.・Fan, 15..HEPA filter 118・
・IIEPA filter, 19...Fan runner.

Claims (1)

[Claims] One or more purified air ejectors each having a fan and a HEPA filter installed in a box provided with an air intake opening and an air injection nozzle are installed in a large space to which clean conditioned air is supplied. The operation of the purified air ejector attracts and transports ambient air in the direction of the eject flow, and also regulates the direction of the induced air flow by regulating the injection direction of the eject flow, and the direction of the induced air flow. A method for forming a clean zone in a large space, characterized by: forming a small area in the large space as a clean air zone according to regulations.