JPS63126536A - Clean air supplying device - Google Patents

Abstract

PURPOSE:To surely kill the germs in a filter by providing plural branch passages between an air conditioning apparatus and a blow-out opening to a room and by optionally closing one of the branch passages by passage closing means. CONSTITUTION:When the air conditioning apparatus is put into operation, valves 7, 10 connect a duct 6 with one of the branch ducts 8, and the air is passed through the selected branch duct and the filter unit 9 connected to the selected branch duct, and is blown out as clean air from the blowout opening 3 into the clean room, while germs are stuck to a filter 11 where the games propagate. After a specified lapse of time, air is flowed through another unused branch passage 3 by operating the valves 7, 10, and the air is cleaned by filter unit 9 connected to the unused branch passage.

Description

[Detailed Description of the Invention] [Object of the Invention] L1 Part 2 and Next 1 The present invention is applicable to so-called clean rooms from which dust and airborne bacteria are removed in hospitals, drug manufacturing factories, food processing factories, etc., and air-conditioned rooms that require sterilization. It relates to hospital rooms and sterilization rooms, and relates to devices that supply clean air to those rooms.

When supplying clean air to clean rooms, etc., H is usually used.
It is well known that an EPA filter (hereinafter referred to as a filter) is used. Air is circulated using air conditioning equipment, and before entering a clean room, etc., it is passed through the above filter to collect dust and purify the air.

As is already known, the above filter itself is 0
．． 3g of particles were collected up to 99.99X, and some of them were 0.
Some devices collect up to 99.99% of 1g of particles.

As mentioned above, the performance of the filter itself improves, and most of the bacteria are captured. However, the bacteria captured by this filter are merely captured, and continue to survive and proliferate while being captured. This is so-called membrane proliferation.

The growth of this bacteria causes hygiene problems, so conventionally, especially in hospitals, drug manufacturing factories, food manufacturing factories, etc., the filters had to be replaced every 3 to 6 months even if the filters were not clogged. had to be replaced. Also, the removed filter had to be incinerated. Furthermore, in hospitals and the like, various bacteria are present, and these bacteria are accumulated in filters and multiply, so there is also the problem that the task of replacing the filters is also accompanied by danger.

The present invention has been made to solve such problems, and an object of the present invention is to provide a clean air supply device that can reliably sterilize filters.

[Structure of the invention] +1. Therefore, the present invention provides a plurality of branch channels, at least one of which can be freely closed by a channel blocking means, in the channel from the air conditioner to the clean room or sterilization room, and each of the branch channels The present invention is characterized in that filters are installed independently, and a heating means for heating the filters is installed in parallel with the filters.

It is preferable that the heating means is installed as an electrically heated heater on the intake side of the filter, and it is preferable that the flow path blocking means is provided both at the location where the branch channels diverge and at the location where they merge. As a filter, it is desirable to use a heat-resistant filter made of glass wool sandwiched between wire meshes.Furthermore, the flow path blocking means, branch flow paths, etc. do not need to be completely separated from the air conditioner, but may be integrated in whole or in part. You can let me.

As described above, if branch channels are provided in the air flow path to a clean room, etc., and these branch channels can be closed by a channel blocking means, at least the branch channels can be closed by the operation of the channel blocking means. One of the can be selectively closed. When the heating device provided on the filter of the closed branch channel is operated, the filter is heated.

This heating kills bacteria trapped in the filter. After that, the flow path blocking means is operated to close the other branch flow paths, and the branch flow paths that were previously closed and sterilized are opened and air is allowed to flow there, and the other newly closed branch flow paths are opened. A similar operation sterilizes the filter connected to the duct.

The same procedure is performed for other branch channels in order to sterilize each filter.

Since sterilization is performed by closing one of the multiple branch channels as shown in the above, even during sterilization, air is flowing into the clean room through other branch channels, so it can be used as a clean room or sterilization room without any problems. can do. That is, according to the present invention, the filter can be sterilized without stopping its use as a clean room or sterilization room.

The clean room shown in Figure 4 of L1 Town is a clean room using the present invention, and the configuration of this room itself is not particularly different from the conventional one. Clean air is supplied from the air conditioner and sent to an air conditioner (not shown) through an inlet 5 formed below the floor 4 of the wall 1. This embodiment is characterized by the flow path leading from the air conditioner to the Suita outlet 3, and as shown in the figure, it is connected to a branch duct 8 via a duct 6 connected to the air conditioner and by a valve 7 as a flow path cutoff means. The ducts are branched, pass through a filter unit 9 provided in each branch duct, and are further merged at a valve 10 to be connected to the air outlet 3.

As shown in FIG. 1, in this embodiment, there are two branch ducts 8 serving as branch flow paths, and the valve 7 is a two-way switching type that connects one of the branch ducts 8 to the duct 6. It is a solenoid valve that operates.

The valves 10 are also identical and are arranged to operate in unison and to allow air to flow through the same branch duct. It is also possible to branch into more branch ducts and connect the filter unit 9 to each branch duct. In that case, the flow path blocking means is structured to be able to close at least one of the branch ducts.

The filter units 9 each have a filter 11 in a mutually independent box, and a heater 12 that heats the filter. Although a general filter 11 can be used, it is preferable to use a heat-resistant type filter made by sandwiching glass wool between stainless steel wire meshes.The heater 12 has the filter 11 on the intake side as shown in the figure.
Although it is preferable to install the filter unit 9 close to the filter unit 9, it is also possible to install a heater outside the filter unit 9 to heat the entire inside of the unit.
It can be heated up to ℃. Heating to this temperature ensures that all bacteria are killed.

In this embodiment, the valves 7.10 are installed at both the branching point and the merging point of the branch duct as shown, but they may also be installed only on the intake side, and in that case, as shown in FIG. The filter unit 13 has a structure in which the filter 11 is exposed at the end of the box.
It may be installed so that it becomes a direct air outlet.

When the air conditioner (not shown) of the embodiment installed as shown is operated, the valve 7.10 connects the duct 6 to one of the branch ducts 8, so that the air flows through the selected branch duct 8. The air is cleaned from the outlet 3 through the branch duct and the filter unit 9 connected thereto.
It is blown out into the room. During this time, bacteria adhere to this filter 11 and multiply. After a certain period of time, the valve 7.10 is actuated to allow the air flow to flow into the previously unused branch duct 8 and to be cleaned by the filter unit 9 connected thereto.

After switching the air flow path, electricity is applied to the heater 12 of the filter unit 9 of the newly closed branch flow path to heat the filter 11. This heating sterilizes the filter 11. When heating to 350°C, a heating time of about 5 minutes is sufficient. As mentioned above, heating at this high temperature can kill all bacteria, but heating at 300°C or higher will almost achieve the objective.

The frequency of this flow path switching and sterilization varies depending on the location and usage conditions, and in most cases it may be done about twice a day, and in as little as once a week.Electrically operated valve 7.1
It is desirable that the heater 12 be automatically operated for a certain period of time when the heater 12 is operated.

As mentioned above, the filter is sterilized almost regularly, so there is no need to replace it due to requests from bacteria, and it is only necessary to replace it purely when it becomes clogged.Therefore, the filter should be replaced once every two years or so. It is sufficient to exchange the degree. Also, since the filter is sterilized when replacing it, the work can be done without any danger.

FIG. 3 relates to yet another embodiment, and is an example in which it is integrated with an air survey device. A part of the inside of the casing 20 is divided into two parts, and one of the branch ducts 8 is divided by the damper 17.
The heat exchanger 14 connected to the heat pump unit 15 is also arranged inside the casing 20.

That is, the wave path blocking means in this embodiment is the damper 17. Note that the other heat exchanger 16 of the cono heat pump unit 15 is placed outdoors as shown. This casing 2° has a valve 18 for introducing circulating air from a clean room, etc. and/or outside air inlet 1.
Air from 3 is sent in by fan F. Therefore, air is sent into the casing 20 by the fan F, cooled or heated by the heat exchanger 14, and then passed through any branch duct 8 by the damper 17, purified by the filter 11, and sent into the room. There is no particular difference from the above example in that the filter 11 of the branch duct 8 blocked by the damper 17 is heated with the heater 12 to sterilize it.

[Effects of the Invention] As described above, according to the present invention, since the filter for purifying the air is provided with a heating means for heating the filter, the filter can be sterilized by heating. Therefore, any interference caused by bacteria trapped in the filter can be eliminated. That is, the filter can be used for a long period of time without being replaced, the replacement work is not dangerous, and there is no need to incinerate the removed filter.

Moreover, since the filter has a structure in which the flow passages are individually provided in the branch passages that are branched through the passage blocking means, any of the branch passages can be closed by the passage blocking means, and the closed branch passages can be closed. The filter can be sterilized. Therefore, even during the above-mentioned sterilization work, clean air can be sent through other branch channels, and the clean room and sterilization room can be used continuously. Furthermore, since heating is performed in closed branch channels, there is no risk of heated air entering the room.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is a sectional view of another embodiment, FIG. 3 is a horizontal sectional view of another different embodiment, and FIG. 4 is an embodiment of the embodiment shown in FIG. 1. A cross-sectional view of a clean room using 6: Duct, 7.10: Valve, 8: Branch duct. 9: filter unit, 11: filter, 12: heater, 17: damper.

Claims (5)

[Claims] (1) In a clean air supply device that supplies air from an air conditioner to a room through a filter, at least one of a plurality of branch channels is provided in the air flow path from the air conditioner to the outlet into the room. The branch flow passages are formed one by one through a flow passage blocking means that can be freely closed, and each branch flow passage is provided with a mutually independent filter for purifying air and a heating means for heating the filter. Clean air supply equipment. (2) The heating means is an electrically heated heater,
The clean air supply device according to claim 1, which is arranged on the intake side of the filter. (3) The clean air supply device according to claim 1 or 2, wherein the filter is a heat-resistant filter in which both sides of glass wool are sandwiched between wire meshes. (4) Claim 1, wherein the flow path blocking means is provided at both a branch point from the flow path and a confluence point from a branch flow path.
The clean air supply device according to item 1, 2 or 3. (5) The clean air supply device according to claim 1, which is a registered utility model, wherein the downstream side of the heat exchanger in a casing housing the heat exchanger is divided into two to form a branch flow path.