JPH0244816Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a unit type air filter that collects radioactive substances, pathogenic viruses, bacteria, etc. In particular, when replacing the air filter, it is inconvenient for humans to handle it with bare hands, so this relates to a so-called "bag-in-bag-out" type replacement device that is carried out in a bag such as a plastic bag.

(Prior Art) A conventional "bag-in-bag-out" type filter device, as shown in FIGS.
It is attached with a ring c, and gaskets e are provided on both sides of the external lid d. When the lid is tightened with a fastener f, the gasket e applies pressure to the bag a, but the seam g of the bag has a pressure equal to the thickness of the bag. Because of the steps, it was not possible to maintain a high degree of airtightness.

Recently, this has been improved, and as shown in Figure 9, a flange h is provided on the outer periphery of the bag port b, and the lid d does not cover the vinyl bag a, but the flange h on the outer periphery
There are some types that maintain high airtightness by tightening them with bolts i, but the structure is complicated and the dimensions are large.
Manufacturing costs become high. Furthermore, the airtightness inside and outside the bag in this system is insufficient because it has the same structure as the conventional type, and airtightness from the outside is maintained only by the independent lid d.

(Problems to be solved by the invention) It maintains the high airtightness required during operation, maintains a good balance between workability and airtightness maintenance during replacement, and is inexpensive due to its simple structure and minimum dimensions. The present invention aims to provide a unit type air filter replacement device that can be manufactured.

(Solution by invention) A filter replacement bag is composed of a bag port internal storage part, a bag port external mounting part, and a seamless flange packing in the middle, and the flange packing is brought into contact with the edge of the bag port that is integrated with the filter storage casing. Then, the lid was tightened and fixed using a fastener.

(Example) An explanation will be given based on FIGS. 1 to 6. 1 is a unit type air filter, which is housed in a filter housing casing 2. 3 is a bag port integrated with the filter storage casing 2, and a filter replacement bag 4 (FIG. 4) is attached to this bag port 3.

The filter replacement bag 4 has a bag port internal storage part 4a and a bag port external mounting part 4c,
A flange packing 4b is provided between these, which comes into contact with the edge of the bag port 3 during installation. Reference numeral 5 denotes a bag attachment O-ring, which is fitted into an annular recess provided on the side of the bag port 3. Reference numeral 6 denotes a filter inspection lid, which is provided with a pair of parallel lid tightening fittings 6a. Reference numeral 7 denotes a fastener such as a bolt/nut, one end of which is pivotally supported by a bracket 7a provided on the filter storage casing 2, and the other end of which is screwed into a nut 7b.

(Filter replacement method) This will be explained with reference to FIG.

1. During operation of this filter device, the lid 6 is closed as shown in FIG. 7a, ie, FIG. 3.

2. When replacing the filter, loosen the tightening nut on the lid 6, remove the lid 6, and pull out the filter replacement bag 4. And a glove 8 attached to the filter replacement bag 4 (optional)
The used and contaminated unit type air filter 1 is taken into the filter replacement bag 4 (FIG. 7c).

3. Flatten the filter replacement bag 4 and apply heat and pressure using an electric heat crimping machine to heat seal 2 to 3 times.
After finishing, cut with scissors 9 (FIG. 7d), and separate the used air filter while storing it in the replacement bag 4.

4. Attach the replacement bag 4 containing the new unit type air filter 1 on top of the part that remains at the bag port 3 due to the shortened dimensions.
Then, insert the old replacement bag 4 and bag attachment band 5 inside the new replacement bag 4,
Fix a new replacement bag 4 to the bag port 3 with a new bag attachment band 5 (Fig. 7e).

5. Store the unit type air filter 1 in the filter storage casing 2, fold up the tip of the replacement bag 4, and store it in the bag port 3 (Fig. 7g).

...Replacement completed.

(Effects) A seamless flange packing is provided in the middle of the vinyl bag for filter replacement, and the gap between the lid and the filter storage casing can be firmly tightened with fasteners such as bolts and nuts. Therefore, it is unavoidable that the bag itself has seams due to processing reasons, but this seamless flange functions as a gasket when the lid is tightened, thereby improving the airtightness of class safety cabinets for preventing biohazards. Pressurize to the required +75mmH ₂ O,
It has become possible to sufficiently maintain the permissible Freon gas leakage amount of 1×10 ^-7 cc/sec. Also, the volume percentage per unit time is 0.1vol%/h
You can also hold the following:

[Brief explanation of the drawing]

Figure 1 is a unit type air filter replacement device, Figure 2 is a right side view of Figure 1, Figure 3 is an enlarged cross-sectional view of the section taken in the direction of the arrow in Figure 1, and Figure 4 is an enlarged perspective view of a filter replacement bag. Figure 5 is the − of Figure 4.
6 is a cross-sectional view, and FIG. 7 is an explanatory diagram of how to replace a unit type air filter.
FIG. 8 is a conventional exchange device, FIG. 9 is a perspective view of a replacement bag used in the conventional exchange device, and FIG. 10 is a sectional view of a second example of the conventional exchange device. In the figure, 1...unit type air filter;
2... Filter storage casing, 3... Bag port, 4... Bag for filter replacement, 4a... Bag port internal storage area, 4b... Flange packing, 4c...
Bag port external mounting part, 5... Bag mounting band,
6...Lid (for filter inspection), 6a...Lid tightening fittings,
7... Fastener, 7a... Bracket, 7b... Bolt nut, 8... Glove, 9... Scissors.

Claims (1)

[Scope of utility model registration request] A bag for filter replacement is composed of a bag port internal storage part 4a, a bag port external mounting part 4c, and an intermediate seamless flange packing 4b, and the bag port 3 is integrated with the filter storage casing 2.
A unit type air filter replacement device characterized in that the bag intermediate flange 4b is brought into contact with the edge of the bag, and the lid 6 is tightened and fixed with a fastener 7.