JPS60129539A - Air cleaner - Google Patents

Abstract

PURPOSE:To prevent the degree of cleaness in a cleaning space by a method wherein third space, facing to an opening and closing door, is formed in a part of a cleaning chamber while a pressure regulating means is provided in the device. CONSTITUTION:The space 29, provided independently between the opening and closing door 7 and main body peripheral wall 11 so as to be neighbored to the outside 50 of the machine and the cleaning chamber 1, is constituted so as to hold a pressure different from either the pressures in the cleaning chamber 1 or the outside 50 by a filter 33, a fan 34 and an air feeding chamber 35. A part of air, sent out of the fan 4, is pressurized by the fan 34 and it sent into the space 29 from the air feeding chamber 35 as clean air after filtrated by the filter 33 whereby the pressure of the space 29 becomes higher than either one of the same in the cleaning chamber 1 or the same in the outside 50. According to this constitution, when the flow of clean air from the space 29 to the outside 50 and the flow of clean air from the space 29 to the cleaning chamber 1 are generated as shown by arrow signs in the diagram and the corner 1a of the cleaning chamber 1 becomes negative pressure lower than the outside 50, atmosphere will never flow into the corner 1a and the degree of the cleaning chamber 1 will never be deteriorated by the stagnation of air, containing dust.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an air cleaning device such as a clean bench, a clean room, or an air shower device, which has an opening/closing door between a clean room and the outside world.

[Background of the invention]

Conventionally, in this type of air purifier, contaminated air from outside, including dust and germs, entered the clean room through the gap between the door and the main body wall to which it was attached, and the door was replaced with an automatic door. In such cases, there is a risk that dust generated in the door drive section when the door is opened/closed may enter the clean room through the gap between the drive section case and the opening/closing door, reducing the cleanliness of the room.

Specific example J will be explained below.

Figure 1 shows a conventional example of a circulating air clean bench for handling harmful substances and dangerous pathogens.

This clean bench includes a clean room 1 having an opening 2 in the front, an air supply filter 3, a blower 4, an air supply tact 5, and an exhaust filter 6 for supplying clean air to the clean room l. 1 and the outside world 50 is provided with a sliding door 7 having translucency. Clean room 1 during work
In order to prevent harmful substances and pathogens inside from flowing out to the outside world, some of the air inside the clean room 1 is pumped together with outside air through an air intake port 8 provided on the workbench as shown by the arrow in Figure 1 (a). A part of the air sucked into the space 9 under the workbench and sent out from the blower 4 is discharged to the outside through the exhaust filter 6, and the remaining air is passed through the air supply filter 3 to the ceiling air outlet 1.
0 to the clean room 1, and the opening 2 is closed by the opening/closing door 7 to keep the internal pressure of the clean room 1 lower than the outside world 50.

The opening/closing door 7 is movable in the vertical direction so that experimental equipment can be easily carried in and out of the clean room 1, and there is a space between the opening/closing door 7 and the main body peripheral wall 11 to prevent contact between the door and the main body during the opening/closing operation. To prevent this, a gap 12 is provided.
In order to prevent outside air from flowing into the clean room 1 through the opening 2, a backing 13 that slides into contact with the opening/closing door 7 is attached to a part of the periphery (upper side) of the opening 2 by means of a holding plate 14.

However, with this structure, if the contact pressure of the para and king 13 against the opening/closing door 7 is increased, the opening/closing door 7 will be damaged due to frictional force.
It is impossible to eliminate the gap between the opening/closing door 7 and the backing 13 because the operation cannot be performed smoothly, and as mentioned above, the pressure in the clean room 1 is lower than that in the outside world 50, so this pressure difference This is indicated by the arrow in Figure 1(b). Outside air flows into the clean room 1 through the gaps between the opening/closing door 7, the main body peripheral wall 11, and the backing 13, or the gap between the seal 13 and the mounting surface of the main body peripheral wall 11, reducing the cleanliness of the room. Inconveniences may occur, such as contamination of the sample being handled with bacteria from the outside air.

FIG. 2 shows a conventional example of an open clean bench that releases the entire amount of clean air supplied to the clean room to the outside world. This clean bench includes a clean room 1 having an opening 2 in the front, and an air supply filter 3 for supplying clean air to the clean room 1.
, a blower 4, an air supply duct 5, a pre-filter 15,
A sliding door 7 having translucency is provided between the clean room 1 and the outside world. To prevent outside air from flowing into the clean room J during work, outside air is taken in through the pre-filter 15 as shown by the arrow in FIG. The air is supplied to the clean room 1 from the ceiling air outlet 10 through the air outlet, and the air that has passed through the clean room 1 is made to flow out from the opening 2 on the lower side of the opening/closing door 7 to the outside world. The opening/closing door 7 is movable in the vertical direction with a gap 12 provided between it and the main body peripheral wall 11. Normally, the opening/closing door 7 is used to reduce the area of the air outlet of the clean room 1 as much as possible to reduce the internal pressure of the clean room 1 to the outside world. Although it is used in a higher position, there may be cases where the area of the air outlet of the clean room 1 must be greatly expanded due to work circumstances. In this case, the internal pressure of the clean room 1 drops to near atmospheric pressure, and especially the main body peripheral wall 1 around the air outlet 1O
A clean room l surrounded by the bent lower surface of the door 7 and the back surface 1 of the opening/closing door 7
The corner 1a has a negative pressure compared to the outside world due to the suction effect of the blown air current, and outside air may flow into this negative pressure area through the gap 12, reducing the cleanliness of the room. As a countermeasure against this, in the past, a backing 13 that made sliding contact with the opening/closing door 7 was attached to the bent part of the main body peripheral wall 11 using a presser plate 14, but as in the example shown in FIG. Since it is impossible to eliminate the gap between the opening and closing door 7, the main body peripheral wall 11 and the backing 13, or the gap between the mounting surface of the backing 13 and the main body peripheral wall 11, as shown by the arrow in FIG. Therefore, it was not possible to sufficiently prevent outside air from flowing into the negative pressure portion 1a of the clean room 1 and reducing the cleanliness of the room.

FIG. 3 shows a conventional example of an air shower device with an automatic door. In the same figure (a), one side of the opening/closing door 18 configured as an automatic door faces the clean room (clean room) 16, and the other side faces the shower room 17 inside the air shower device.
The clean room 16 faces the shower room 17 and allows people and equipment to pass between the clean room 16 and the outside world 50. The automatic door drive unit case 20 is attached to the end of the air shower device main body case 19 corresponding to the area around the opening of the clean room 16, and the drive motor 2 is installed inside the automatic door drive unit case 20.
1. Drive pulley 22a, idle boo! 122b, drive belt 23, drive bracket 24, guide roller 25
, guide rails 26 and other driving parts are housed therein.

The door drive mechanism is driven by a drive boo! as shown in FIG. 3(b).
The drive belt 23 and the opening/closing door 18 are connected via the bracket 24, and the drive belt 23, which is passed between the J22a and the idle booby J22b, is attached to the shaft of the drive motor 21. J
By the rotation of 22a, the opening/closing door 18 suspended from the guide rail 26 via the kite roller 25 is moved from side to side along with the drive belt 23 and the drive bracket 24.

A gap 27 for sliding the opening/closing door 18 is provided between the groove peripheral wall opened on the lower surface of the door drive unit case 2o and the opening/closing door 18. It communicates with the clean room 16 through, and is always at the same pressure as the inside of the clean room.

In such a conventional air shower device with an automatic door, there is a drive boom when the door is opened or closed. The dust generated from the drive belt 23 due to the friction with the belt 22a passes through the gap 27 and enters the clean room 1 as shown by the arrow in Fig. 3 fa).
There was a risk that the water would spread into the room and reduce the cleanliness of the room.

According to actual measurements, there is a boom when opening and closing the door! The amount of local dust generated due to the friction between j 22a and the belt 23 is about 6000 particles with a size of 0.5 μm or more, and about 30 particles with a size of 0.3 μm or more.
In some cases, there can be as many as 1,000 pieces, and in a clean room with many comings and goings, it becomes a source of contamination that cannot be ignored. Moreover, in this case, since the opening/closing door 18 slides within the groove of the door drive unit case 20, the gap 27 cannot be closed with a dustproof backing.

[Purpose of the invention]

The object of the present invention is that even if there is a gap between the opening/closing door and the wall surface to which it is attached, contaminants such as dust and germs can enter the clean space through this gap, thereby reducing the cleanliness of the clean space. The object of the present invention is to provide an air purifying device that does not cause deterioration.

[Summary of the invention]

The present invention is provided with a shutter provided to be openable and closable to partition a first space and a second space kept clean, wherein the shutter is provided between the first space and the second space. This air cleaning device is characterized in that it forms a third space that opens along the shutter, and is provided with a pressure adjustment means that adjusts the pressure in the third space.

[Embodiments of the invention]

4 and 5 show a first embodiment of the present invention applied to a circulating air type clean bench for handling harmful substances and dangerous pathogens.

This embodiment is different from the conventional example shown in FIG. , 13
A third space 2 facing the opening/closing door 7 which is a shutter by b
9, and is provided with a pressure adjusting means for maintaining the two spaces at a pressure different from that of both the clean room 1 and the outside world 5o, which is the first space. Other than that, the basic configuration and functions are the same as the conventional example shown in Figure 1.
Corresponding parts will only be shown with the same reference numerals and their explanation will be omitted.

Regarding the part surrounded by solid line C in Fig. 4(a), fi
To explain, as shown in an enlarged view in FIG. 4 fb), the backings 13a and 13b are attached to the two opposing sides of the Uj-shaped curved portion 1a of the main body peripheral wall 11 by presser plates 14a and 14b, respectively. A third space 29 is formed between the backings 13a and 13b. The space 29 is adjacent to the gap 12 between the opening/closing door 7 and the main body peripheral wall 11 via the backing 13a, and is adjacent to the clean room l via the backing 13b. As shown in FIG. 5, a space 29 formed along the upper side of the opening 2
Both ends in the longitudinal direction communicate with air passages 30 on both left and right sides of the clean room 1, and the lower part of the air passage 30 is connected to the space 9 below the workbench where the blower 4 is housed, so that the space 29 is connected to the clean room 1. It constitutes a pressure adjusting means that maintains a pressure different from both the pressure of the pressure l and the outside world. That is, in this example, the blower 4
During operation, the air in the space 29 is sucked by the blower 4 through the air passage 30 and the space 9 below the workbench, so the pressure in the space 29 is lower than both in the clean room 1 and the outside world.

Therefore, as shown by the arrow in FIG. A flow of clean air flows into the space 29 from J through the gap between the opening/closing door 7 and the backing 13b, and all the outside air that flows into the space 29 is extracted by the blower 4, so it passes through the gap 12 and flows into the clean room 1. There is no possibility that outside air will flow into the clean room 1, and there is also no possibility that harmful substances or dangerous pathogens in the clean room 1 will flow out through the gap 12 to the outside world.

In this case, as long as the pressure difference between the space 29, the clean room 1, and the outside world is maintained, there is no problem even if there is some gap between the backings 13a, 13b and the opening/closing door 7.
The frictional force caused by the backing can be reduced, and the opening/closing door 7 can be opened and closed with a small force.

It becomes.

Reference numeral 31 in FIG. 5 denotes guide parts provided on both sides of the opening 2 to move the opening/closing door 7 up and down.

In a clean bench having such a sliding door, it is the inflow of outside air from the gap 12 that greatly affects the indoor cleanliness. Therefore, in order to prevent the indoor cleanliness from deteriorating due to the inflow of outside air, it is practically sufficient to provide the space 29 along the upper side of the opening 2, but if necessary, the guide 31 can be A third space 29 communicating with the air passage 30 can also be provided on both sides of the provided opening 2 to prevent outside air from flowing in through the gap between the opening and closing door 7 and the door 31.

In the above embodiment, the third space 29 is provided at the bottom of the gap 12 along the upper side of the opening 2, but an independent space 29 may be provided at the top of the gap 12 or in the middle of the gap 12. . Alternatively, backings 13a and 13b may be attached to the upper and lower ends of the gap 12 to form the gap 12 itself as the third space 29.

Further, although the above embodiment is an example in which the space 29 is maintained at a pressure lower than both the cool room 1 and the outside world, another pressure adjustment means for pushing clean air into the space 29 is provided, and the space 29
The same effect can be obtained even if pressure 9 is maintained at a higher pressure than either the clean room 1 or the outside world. The specific means will be explained in the second embodiment.

Figure 6 shows the second embodiment of the present invention applied to an open clean bench.
An example is shown below.

The difference between this embodiment and the conventional example shown in FIG. 2 is that the opening/closing door 7
The upper and lower ends of the gap provided between the main body peripheral wall 11 and the gap A' are closed with backings 13a and 13b to form a third space 29 facing the opening/closing door 7, and to connect the space 29 with the clean room 1 and the outside world. The reason for this is that a pressure adjusting means is provided to maintain the pressure at a pressure different from both.

Since the other basic configuration and functions are the same as those of the conventional example shown in FIG. 2, corresponding parts are simply shown with the same reference numerals and their explanation will be omitted.

Regarding the part surrounded by solid lines in Fig. 6fa,), further i
"p L < To explain, as shown in an enlarged view in FIG. 6(b), the gap provided between the opening/closing door 7 and the main body peripheral wall 11 is adjacent to the outside world via the upper backing 13a, and the gap is adjacent to the outside world via the upper backing 13b. An independent space 29 adjacent to the clean room 1 is formed through the hole 3 in the peripheral wall of the main body.
2 to an air supply chamber 35 having a second air supply filter 33 and a second air supply blower 34, and the space 29 is connected to the clean room 1 by the filter 33, the blower 34, and the air supply chamber 35. It constitutes a pressure adjusting means that maintains the pressure at a pressure different from that of the outside world. That is, a part of the air sent out from the blower 4 is further pressurized by the blower 34 and sent from the air supply chamber 35 to the space 29 as clean air by the filter 33, so that the space 29 is separated from the clean room 1 and the outside world 50. The pressure will be higher than either.

Therefore, as shown by the arrow in FIG. 6(b), the flow of clean air from the space 29 to the outside world 5O through the gap between the door 7 and the backing 13a, and the flow of clean air between the door 7 and the backing 1
A flow of clean air is generated from the space 29 toward the clean room 1 through the gap between the space 29 and the clean room 3b.
Outside air does not flow into a. Furthermore, in this example, since clean air is supplied from the space 29 to the corner 1a of the clean room J, the air containing dust stagnates in the corner 1a and the clean room]
It also does not reduce the cleanliness of the product.

In this case as well, the space 29, the clean room 1 and the outside world 15O
As long as the pressure difference between the backing 13a and
Since there may be some gap between the door 13b and the opening/closing door 7, the frictional force caused by the backing can be reduced, and the door can be opened/closed with a small force.

7 to 9 show a third embodiment of the present invention applied to an air shower apparatus equipped with an automatic 1.'a as a shutter.

FIG. 7 is a diagram showing the overall structure of the air shower device, in which only the circulating air blower 36 is normally operated;
Therefore, the air in the shower room 17 passes through the air intake port 37, the circulating air flow ducts 1-38 and 39, and then reaches the circulating air flow filter 4.
The clean air that has been passed through the filter 40 is discharged from the ceiling air outlet 41 into the shower room 17, forming a low-velocity circulating air flow a. When a person or article enters the shower room 17, the jet airflow blower 42 is activated.
A part of the air taken in from the air intake port 37 by the blower 42 passes through the jet airflow ducts 43, 44 and the jet airflow filter 45, and is blown out into the shower room 17 from the side air outlet 46 as a high-speed jet airflow. , to remove dust adhering to the human body and objects. This air shower is connected to the clean room 16 by passing through the partition wall 16' of the clean room 16.

In this air shower device, the air circulation duct 38 is constantly maintained at a lower pressure than the shower room 17, which is the first space, by the blower 36, while the clean room, which is the second space, is connected to the air shower room 17. 16 is always maintained at a higher pressure than the shower room 17, so as shown in FIG. If the internal space 28 facing the opening/closing door 18 is communicated through the hole 47 provided in the main body peripheral wall 19, the interior space 28 becomes a third space with lower pressure than both the clean room 16 and the shower room 17, and the ninth As shown by the arrows in the figure, air flows from the clean room 16 to the internal space 28 and from this space to the circulating air flow duct 38.

Therefore, when opening/closing the door, the boot 1J 22a and the belt 23
All the dust generated by the friction is sucked into the circulating air blower 36 shown in FIG. 7 and collected by the filter 40.
Dust does not diffuse into the clean room 16 and reduce cleanliness.

In this embodiment, the circulating air blower of the air shower device is used as the pressure adjustment means, but as shown in FIG. The same effect can be obtained by connecting to the suction port 49 and sucking the dust generated in the internal space 28 and discharging it to a place other than the clean room.

Furthermore, if the embodiments of FIGS. 9 and 10 are applied to the opening/closing door 18' provided between the shower room 17 and the outside world 50,
It is also possible to prevent the cleanliness of the shower room 17 from decreasing due to the diffusion of dust from the door drive unit.

The above embodiments are intended for an air purifying device having a sliding door, but are not limited to this, and may include a hinge type opening/closing device provided between a first space and a second space as shown in FIG. 11. It may also be applied to the door 18'' (a third space 28' may be provided around the door 18'', and this space 28' may be connected to a suction port of a blower (not shown) to form the first space and the second space. Lower pressure may be used as a means to prevent contaminants from entering the clean space through gaps around the door, and this is particularly effective for negative pressure clean rooms.

In addition, in FIG. 1j, 51 is a hinge, and 52 is a door handle. The present invention can be applied to any air cleaning device having an opening/closing door other than those exemplified above.

〔Effect of the invention〕

According to the present invention, even if there is a gap between the opening/closing door and the wall surface to which it is attached, it is possible to prevent contaminants from entering the clean room through this gap and improve the cleanliness of the room.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a first conventional example, in which (a) is a side sectional view;
(bl is an enlarged view of part A, FIG. 2 is a diagram showing the second conventional example, (a) is a side sectional view, (bl is an enlarged view of part B, and FIG. 3 is a diagram showing the third conventional example. In the diagrams, (a) is a side sectional view of the main part, (b) is a schematic diagram of the door drive mechanism, and FIGS. 4 and 5 are diagrams of the first embodiment of the present invention. is a side sectional view, (
b) is an enlarged view of part C, and Figure 5 is a partially cutaway front view.
FIG. 6 is a diagram of a second embodiment of the present invention, (a) is a side sectional view, (b) is an enlarged view of the D section, and FIGS. 7 to 9 are diagrams of a third embodiment of the present invention. Fig. 7 is a cutaway front view, and Fig. 8 is a cutaway front view.
9 is a sectional view taken along FF in FIG. 8, FIG. 10 is a side sectional view of the main part showing the fourth embodiment of the present invention, and FIG. 1J is a hinged opening/closing door. FIG. 2 is a sectional view showing an embodiment to which the present invention is applied. 1.16: Second space 7, 18.18": Shutter 28, 28', 29: Third space 4, 30.32.33, 34.35.36.38.47
．． 48.49: Pressure adjustment means 17.50: First spatial agent Junnosuke Donakamura 1 (Q) (b) 2 Figure i2 (a) (b) Figure 1F4 (a) (b) 17'5 Figure 1P6 Figures (a) (b) Spear 7 figure 1'8 figure

Claims (3)

[Claims] (1) In a device equipped with a shutter that can be opened and closed to partition a first space and a second space kept clean, the shutter is provided between the first space and the second space. An air purifying bag arrangement a0, characterized in that it forms a third space that opens along the line, and is provided with a pressure adjustment means that adjusts the pressure in the third space. (2) The pressure regulating means is configured to suck air from the third space and maintain the third space at a pressure lower than either the first space or the second space. An air cleaning device according to claim 1, characterized in that: (3) The pressure regulating means pushes clean air into the third space, and divides the third space into the first space and the second space.
2. The air cleaning device according to claim 1, wherein the air cleaning device is configured to maintain a pressure higher than that in any of the spaces.