JPS6049512B2 - Clean room filter sterilizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clean room filter sterilizer that sterilizes air blown into a clean room.

Clean rooms are indispensable in medical and bacterial research facilities. The down flow method, side flow method and conventional method are well known for this purpose.

To explain the downflow method of this clean room as shown in Fig. 1, air from a blower 2 is sent through a duct 3 and flows into the clean room 1 after sterilization through a high-performance sterilization filter 4 (usually called a Hepa filter). The clean air becomes a laminar flow, flows out from the perforated plate 5 on the floor, and is sent to the blower 2 again.

This clean room 1 is required to maintain a high degree of cleanliness and at the same time to be in a sterile state, so the Hepa filter is 0.
A filter having a dust collection efficiency of 99.97% for 3μ particles is used, and the filter member is coated with an inhibitor.

However, although such a preventive agent has a great preventive effect at the beginning of operation, if it is used for a long time, the preventive effect gradually decreases and eventually the preventive effect is completely lost. begins to accumulate.

The effective period of this protective effect is usually one year after use. On the other hand, the dust removal effect lasts semi-permanently when used at a processing air volume within the standard, but as the air volume gradually decreases, it is necessary to replace it when the pressure loss reaches twice the initial value. Generally, the period is 3 years or more. In this way, it is uneconomical to replace the Hepafilter every time the preventive effect is lost, considering the effective period of the dust removal effect, but on the other hand, from the standpoint of safety and reliability, it is not recommended to use the Hepafilter for a long time. Undesirable.

In view of the above, an object of the present invention is to provide a clean room filter sterilizer that can extend the life of a Hepa filter while keeping a clean room clean.

The clean room filter sterilizer according to the first aspect of the present invention includes a sterilizing filter through which air from an air blower passes and is sent to the clean room, and a sterilizing filter that is provided on the air flower side of the sterilizing filter to remove bacteria attached to the filter. a sterilizing lamp for sterilizing a sterilizing filter, the sterilizing lamp is configured to move along the inflow side of the sterilizing filter, and the sterilizing lamp is moved. As a result, uniform sterilizing light is projected all over the sterilizing filter, increasing the sterilizing effect.

In addition, the clean room filter sterilizing device according to the second aspect of the present invention includes a sterilizing filter through which the air from the blower passes and is sent to the clean room, and a sterilizing filter provided on the air blower side of the sterilizing filter so that the air does not adhere to the filter. It is characterized by having a sterilizing lamp that sterilizes fungi, and a reflector that reflects the sterilizing light of the sterilizing lamp and projects it onto the filter. Since it is projected, the sterilization effect increases accordingly. Embodiments of the clean room filter sterilizer 3 apparatus according to the present invention will be described below with reference to the drawings.

Figures 2 and 3 show a first embodiment applied to a downflow clean room, in which the ceiling and floor of the clean room 10 are formed by perforated plates 11 and 12, respectively.
Three Hepa filters 13 are provided above the porous plate 11.

A blowing fan 14 of a blowing device is provided outside the clean room 10, and is configured to suck air inside the clean room 10 through a perforated plate 12 and blow it to each Hepa filter 13 through a duct 15.

Above each of the Hepa filters 13 is a bracket 1.
Germicidal lamps 17 covered by reference numerals 6 and 6 are respectively attached, and are configured to be turned on and off at the same time as the blower fan 14 by means of an operation panel 18.

Reference numeral 19 in the figure is a bolt for attaching each HEPA filter 13 to the instrument stand 20.

With this configuration, the blower fan 14 is driven by operation of the operation panel 18, and the sterilization lamp 17 is turned on, and the air in the clean room 10 flows out through the perforated plate 12, passes through the duct 15, and enters the Hepa filter 1, The water passes through the perforated plate 11 and flows into the clean room 10 .

Here, the air blower side 13A of the Hepafilter 13 is the germicidal lamp 1.
7, the blown air is also sterilized in the same way, and after being removed by the Hepa filter 1, it flows into the clean room 10.

Here, the sterilizing light beam of the sterilizing lamp 17 is blocked by the HEPA filter 13 and the perforated plate 11, so that the light is not projected onto the people inside the clean room 10, thereby maintaining safety.

Moreover, since the bracket 16 is provided above the germicidal lamp 17, the pressure loss of the air blown from the duct 15 is minimized.

Since the sterilizing lamp 17 has a large sterilizing ability, it is not necessary to operate it at the same time as the blower fan 14, and it is sufficient to use a timer or the like to irradiate it for about one minute after the blower fan 14 has been used for a certain period of time. be.

Table 1 shows the experimental results regarding the presence or absence of such germicidal lamps.

The Hepa filter used was 6 in both the conventional example and this example.
Three 10 x 762 x 292 (TwL) were used, and the germicidal lamp was 15W, one for each Hepafilter, for a total of three.The germicidal lamp irradiation interval was 1 minute, and the irradiation time was 10 ctf. The measurement was performed with an air volume of 1 in the culture pond of Schare.
This method is based on counting the number of bacterial colonies generated after inhaling 50e.

In this way, it can be seen that the sterilizer of this example did not generate any fungi even after 10,000 hours had passed, which is a significant difference compared to the conventional one.Although the installation cost is higher than the conventional one, the Hepafilter Since the service life of the system is extended, running costs are reduced and reliability is improved, so the increase in installation costs is more than covered.

Next, in the second embodiment shown in FIGS. 4 and 5, the germicidal lamp 17 is
is said to be movable.

That is, the germicidal light travels over each Hepa filter 13 along a germicidal lamp traveling rail 21 installed above the Hepa filter 13, and emits germicidal light to the air blower side of the Hepa filter 13.

Further, a bracket 16A is provided above the sterilizing lamp 17 in the same way as in the previous embodiment to reduce air blowing resistance.

According to this embodiment, the number of sterilizing lamps is reduced and a uniform sterilizing light beam is applied to the HEPA filter 13, thereby increasing the sterilizing effect.

This germicidal lamp can be moved by a motor etc. for 20 c! n/Min
It is desirable to do this at a moderately low speed. Next, in the third embodiment shown in FIGS. 6 and 7, unlike the previous embodiments, a bracket 22 is provided opposite each bracket 16 of the germicidal lamp 17. A reflecting mirror 23 is provided to reflect the sterilizing light and project it to the blower side of the Hepa filter 13.

With this, the sterilizing lamp 17 can be removed simply by attaching the reflector 23.
The germicidal rays can be used effectively.

Although each of the above embodiments has been described as being applied to a down-flow type clean room, the present invention is not limited to this, and is applicable not only to built-up clean rooms as explained above, but also to movable simple clean rooms. Applicable.

As is clear from the above description, according to the first and second aspects of the present invention, the sterilization effect on fungi attached to the air flow side of the sterilization filter is excellent, so that it is possible to constantly supply sterile air to the clean room. This has excellent effects such as improving the reliability of the clean room, extending the life of the Hepa filter, and reducing running costs.

[Brief explanation of drawings]

Figure 1 is a cross-sectional side view showing a conventional clean room;
The figure is a cross-sectional side view showing the first embodiment of the clean room filter/sterilizer according to the present invention, FIG. 3 is a plan view of the same, and FIG.
The figure is a cross-sectional side view showing the second embodiment, FIG. 5 is a plan view of FIG. 4, FIG. 6 is a cross-sectional side view showing the third embodiment, and FIG.
The figure is a plan view of FIG. 6. 10...Clean room, 13...Hepa filter, 14...Blower fan, 17...
...Bactericidal lamp, 21...Traveling rail, 23...
·Reflector.

Claims (1)

[Claims] 1. A sterilization filter through which air from an air blower passes and is sent to a clean room, and a sterilization lamp provided on the air inflow side of the sterilization filter to sterilize fungi attached to the filter. 1. A clean room filter sterilizing device comprising: a sterilizing lamp that moves along an inflow side of a sterilizing filter. 2. A patent claim characterized in that the sterilizing filter is formed by a plurality of filter groups arranged in parallel on the same plane, and the sterilizing lamp is adapted to move along the filter group. The clean room filter sterilizer according to item 1. 3 A sterilization filter through which the air from the blower passes and is sent to the clean room, a sterilization lamp installed on the air inflow side of this sterilization filter to sterilize fungi attached to the filter, and a sterilization lamp that reflects the sterilization light from the sterilization lamp. A clean room filter sterilizer comprising: a reflector for projecting light onto a filter;