JP2015121347A - Method of replacing hepa filter in isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an isolator enabling replacement of a HEPA filter collecting hazardous particulate matter, in which replacement work of the HEPA filter is not performed with a bag such as in a bag-in and bag-out system, and a three-dimensional type HEPA filter is used, which prevents scattering of the hazardous particulate matter, has high resistance to breakage and is usable as a waste container, to make workability easy and perform the replacement work more safely.SOLUTION: In an isolator, a three dimensional type cylindrical bottomed exhaust HEPA filter is installed facing a workroom side opening for discharging dust provided in a workroom and has a HEPA filter opening for taking in dust in the top. A two-ply lid of an upper lid and a lower lid for closing the workroom side opening and the HEPA filter opening is provided on the HEPA filter opening. A knob is provided on the two-ply lid for enabling the two lids to be fixed and integrated with each other or to be separated from each other. When taking out the HEPA filter, the HEPA filter opening is closed by the lower lid and the workroom side opening is closed by the upper lid.

Description

  In the present invention, a sealed work device for handling dangerous materials (hereinafter referred to as an isolator) can be replaced with a hepa filter for removing dangerous materials scattered in the work chamber without causing harm to workers and the environment. The present invention relates to a method of replacing a hepa filter characterized by things.

  Conventionally, isolators, which are small isolation devices that handle active chemical substances such as drugs for cancer treatment, hormones, and radioactive substances, have a working room with an air supply hepar filter and an exhaust hepa filter, and an external working room. Work gloves are arranged to enable this work. Regularly sterilize and clean the air supply hepa filter and exhaust hepa filter and replace them.

A schematic cross section of the isolator is shown in FIG.
The isolator 1 has a front door 3 in front of the negative pressure working chamber 2, and a work glove 5 is provided in a state in which a hand can be inserted from outside into a glove port 4 provided in the front door 3. The back surface of the negative pressure working chamber 2 forms an air flow channel 6 across the wall surface 7, and the negative pressure working chamber 2 and the air flow channel 6 are connected to each other at the lower portion of the air flow channel 6 by communication paths 6 a and 6 b. Between the communication passages 6a and 6b, the exhaust filter 8 is fixed by a filter fixing stud bolt 9a and a nut 9b.

A back plate 10 facing the exhaust hepa filter 8 of the isolator 1 is provided with a bag-in bag-out port 11a. The bag-in bag-out port 11a has a bag mouth of a plastic bag (hereinafter referred to as a bag) 12. And the bag mouth portion is fastened by the rubber rings 18a and 18b, and the bag 12 is tightly supported by the bag-in / bag-out port 11a.
The bag-in bag-out port 11a supporting the bag 12 is covered with the bag 12 by a bag-in bag-out port cover 11b (shown in FIGS. 1 and 2A) attached to the back plate 10.
As described above, the bag 12 is stored in the bag-in / bag-out port cover 11b by being supported by the back plate 10 and being folded. The bag is provided with a pair of working gloves 13. 14 is a circulation fan, 15 is an outdoor exhaust port, 16 is an air supply hepa filter, and the rotation of the circulation fan 14 sucks the air in the work chamber 2 from the air passage 6a through the hepa filter 8 and allows the work chamber 2 to be drawn. Maintains negative pressure.

In the above apparatus, replacement of the hepa filter 8 is performed as follows.
Note that FIG. 2 showing the process of replacement shows only the peripheral portion of the hepa filter 8 to be replaced of the isolator 1 in an enlarged manner.
This will be explained in the order of the replacement work.
1. Inside the bag-in-bag-out port cover 11b of the isolator 1, a plastic bag 12 with working gloves 13 is set in a folded state (FIG. 2 (A)).
2. Since the bag 12 with the work gloves 13 is folded and stored inside the bag-in-bag-out port cover 11b, the cover 11b is removed and the bag 12 is pulled out (FIG. 2B).
3. Hands are put into the working gloves 13 in the bag 12 and the hepa filter fixing nut 9b and the filter fixing metal fitting 9c are removed, and the used contaminated hepa filter 8a is removed from the filter fixing stud bolt 9a and put in the bag 12 ( FIG. 2 (C)).
4). The used contaminated hepa filter 8a is accommodated in the innermost part of the bag 12, and two middle portions of the bag 12 are bound or heat-sealed 17 and sealed (FIG. 2D).
This means is also described in Patent Document 1.
5. Cut between the two places that have been bound or heat-sealed 17 and remove the used contaminated hepa filter 8a in the bag 12 and discard it. The discarded hepa filter is appropriately incinerated (FIG. 2E).
6). One of the rubber rings 18a and 18b fixing the bag 12 to the bag-in / bag-out port 11a at two locations is removed while shifting (FIG. 2 (F)).
7). A new bag 12a (with work gloves) containing a new hepa filter 8b is put on the bag-in / bag-out port 11a. At that time, the cut old bag 12 remaining in the bag-in / bag-out port 11a is overlapped so as to cover the new bag 12a (FIG. 2G).
8). The rubber ring 18b used for the old bag 12 is removed from the port 11a using the working gloves 13a provided in the new bag 12a. At the same time, the old bag 12 is removed from the bag-in / bag-out port 11a (FIG. 2 (H)).
9. The removed rubber ring 18b and the old bag 12 are stored in the new bag 12a. The new bag 12a is fixed to the port 11a with a rubber ring 18c (FIG. 2 (I)).
Ten. The newly used hepa filter 8b in the new bag 12a is attached to the fixing glove 9c with the work gloves 12 of the new bag 12a using the filter fixing stat bolt 9a and the filter filter fixing nut 9b (FIG. 2 (J )).
11． The new bag 12a is folded, the bag-in-bag port cover 11b is attached, and the replacement is completed (FIG. 2 (K)).
The hepar filter replacement method according to the conventional method has been described above. However, the work is very complicated, and there is a point that only a specialized worker can work, and there is a risk that dangerous materials may leak due to breakage of the bag.

Japanese Patent Publication No.56-20514

  In view of the above, the present invention provides an isolator capable of replacing a hepa filter that collects dust and the like safely and easily. Rather than replacing the hepa filter with a bag of vinyl or the like as in the conventional bug-in-bug-out method, it is used as a waste container that prevents scattering of dangerous particulate matter to the surroundings and has high damage resistance. The object is to use a three-dimensional hepa filter that can be made easier and easier to work with.

  The first aspect of the present invention is a cylindrical bottom having a dust-collecting hepa filter opening 66 at the top, which is installed facing the dust-discharging work chamber surface opening 64 provided in the work chamber 52. The hepa filter opening 66 of the three-dimensional exhaust hepa filter 65 comprises a two-layered cover of an upper cover 68a and a lower cover 68b for closing the working chamber side opening 64 and the hepa filter opening 66, and The lid is provided with a locking member 71 composed of a knob A 71a and a knob B 71b for fixing and integrating the two lids with each other or separating them from each other. When taking out from 51, the hepa filter opening 66 can be closed by the lower lid 68b, and the work surface opening 64 can be closed by the upper lid 68a.

The three-dimensional exhaust hepa filter 65 of the present invention is installed in the lower part of the work chamber 52 of the isolator through an opening 64 on the work chamber side, and the opening 64 is provided with a two-layered upper cover 68a and a lower cover 68b. Therefore, the opening 66 of the three-dimensional exhaust hepa filter 65 is kept airtight by the lower lid 68b, and the isolator 51 is accommodated in the three-dimensional exhaust hepa filter 65 without leaking contaminated air in the hepa filter to the outside. The object to be processed can be taken out.
Further, in order to prevent leakage due to breakage during transportation, if the three-dimensional exhaust hepa filter 65 is placed in a sealed bag (plastic bag) and further sealed by heat sealing or the like, the sealing performance can be further maintained. .

A longitudinal conceptual view of an isolator with a conventional bug-in / bug-out installation. In a schematic longitudinal sectional view of a hepa filter device portion in an isolator for performing a conventional hepa filter exchange method, A to K sequentially show exchange processes. The longitudinal section conceptual diagram of the isolator which installed this invention hepa filter. Sectional drawing of the state which attached the three-dimensional type | mold exhaust hepa filter to the working chamber side opening part under the working chamber of an isolator. FIG. 3 is a cross-sectional view of a three-dimensional exhaust hepa filter in a state where both an upper lid and a lower lid are to be attached to a work opening and a hepa filter opening. Sectional drawing of the three-dimensional type | mold exhaust hepa filter of the state which is trying to remove both an upper cover and a lower cover from a work opening part and a hepa filter opening part. Sectional drawing of the state which attached the upper cover to the isolator and the lower cover to the hepa filter, respectively.

Next, the structure of the three-dimensional exhaust hepa filter 65 in the isolator 51 provided with the three-dimensional exhaust hepa filter 65 and its replacement means will be described with reference to the drawings.
The isolator 51 shown in FIG. 3 has an exhaust chamber bar 53 disposed below a work chamber 52 made of a box that occupies the upper half of the apparatus, and sucks outside air into the upper portion of the work chamber 52 via a prefilter 55. An air supply blower 56 and an air supply hepa filter 57 are provided to supply air to the work chamber 52 through these. The air containing the dangerous particle material scattered in the work chamber 52 passes through the punching plate 81 between the work chamber 52 and the three-dimensional exhaust hepa filter 65 and enters the work surface opening 64 and the three-dimensional exhaust hepa filter opening 66. Only clean air is blown into the exhaust chamber 53 through a three-dimensional exhaust hepa filter 65 provided in the exhaust chamber 53, and is discharged outside the apparatus by an exhaust blower 54.
A front door 58 having work gloves 59 is provided in front of the work chamber 52, a pass box 60 is provided on the side of the work chamber 52, and a disposal box 61 is provided on the work surface 63. A maintenance door 62 is provided in the exhaust chamber 53 so that a hepa filter to be discarded can be taken out.

The structure of the three-dimensional exhaust hepa filter 65 will be described.
As shown in FIGS. 3 to 7, the three-dimensional exhaust hepa filter 65 includes a filter main body 67 formed of a bottomed cylindrical body having an opening 66 at the top and a peripheral wall as a filter medium, an upper lid 68a for closing the opening 66, and A socket 73 that has a three-dimensional shape including the lower lid 68b and is screwed into the lower lid 68b is disposed in the opening 66 at the top of the filter body 67 that sucks air.
In addition, clean air is blown from the entire circumference of the three-dimensional exhaust hepa filter 65, and the three-dimensional exhaust hepa filter 65 is fixed to the lower surface of the work surface 63 of the isolator 51 by a catch 79 with a lock as shown in FIG. Yes. If the three-dimensional exhaust hepa filter 65 is a three-dimensional (quadrangular cylinder type), clean air is blown out from four surfaces, and pressure loss can be suppressed.

An initial state before replacement of the three-dimensional exhaust hepa filter 65 will be described.
3 to 7, the normal use state of the three-dimensional hepa filter 65 is fixed to a work surface opening 64 at the lower part of the work surface 63 of the isolator 51 by a catch 79 with a lock and is kept airtight by a hepar packing 78. Yes.
The dangerous particulate matter scattered in the work chamber 52 of the isolator 51 passes through the punching plate 81 on the work room floor, the work surface opening 64, and the three-dimensional hepa filter opening 66, and is collected by the three-dimensional exhaust filter 65. Clean air blows around the hepa filter. The replacement time of the three-dimensional hepa filter 65 is clogged by dangerous particulate matter, or when the periodic replacement time is reached, the upper lid 68a and the lower lid 68b are fixed to the filter body 67 and sealed, and the isolator 51 is sealed from the maintenance door 62. Take it out.

Here, the configuration of the lower lid 68b that closes the opening 66 of the hepa filter body 67 will be described.
The lower lid 68b closes the hepa filter opening 66 when a predetermined amount of waste or the like is accommodated in the cavity 84 of the hepa filter main body 67 and is transported as waste together with the hepa filter main body 67, and the contents are dissipated. It is for not to do. The lower lid 68b hangs and fixes a cylindrical body 70 having a screw threaded on its peripheral surface to the lower surface of a disk having a diameter that can block the hepa filter opening 66, and the cylindrical body 70 is attached to the top of the filter body 67. The socket 73a supported by the end cover plate 73b with the opening 66 closed is screwed, and the socket 73a and the cylindrical body 70 can be screwed together to be integrated.
When the lower lid packing 69b is arranged along the peripheral lower surface of the lower lid 68b, and the lower edge of the cylindrical body 70 is screwed into the socket 73a, the packing 69b comes into pressure contact with the end cover plate 73b of the hepa filter body 67, The cavity 84 of the filter body 67 can be sealed.

The upper lid 68a is configured as follows.
The upper lid 68a is used to close the opening 64 when the hepa filter body 67 installed below the work surface opening 64 following the work surface 63 of the work chamber 52 of the isolator 51 is taken out.

  As shown in FIG. 6, a knob A 71 a and a knob B 71 b are provided on the inner periphery of the disk constituting the upper lid 68 a, and a screw portion of the head is screwed to a nut portion 77 that is fixed to the main body case 83. By combining, the working chamber side opening 64 is closed by the disk of the upper lid 68a. 69a is an upper lid packing, 69b lower lid packing, and 80 is a handle for lifting the lids 68a and 68b when the upper lid is removed.

A procedure for replacing the three-dimensional exhaust hepa filter 65 will be described.
As shown in FIGS. 3, 5, and 6, the upper lid 68a and the lower lid 68b are attached to the three-dimensional exhaust hepa filter 65 as follows. The three-dimensional hepa filter 65 is removed from the isolator 51 and discarded. At this time, in order to prevent re-scattering of the dangerous particulate matter from the three-dimensional hepa filter 65, the working chamber side opening 64 and the three-dimensional hepa filter opening 66 are closed in a state where the upper cover 68a and the lower cover 68b are integrated. Prevent and disperse particulate matter.
The upper lid 68a, the lower lid 68b, the knob A 71a and the knob B 71b integrated outside the isolator 51 are put into the work chamber 52 from the pass box 60.
The replacement work in the work chamber 52 is performed by fitting work gloves 59 attached to the front door 58 of the isolator 51. When the integrated upper lid 68a and lower lid 68b are attached, the punching plate 81 is removed. (Fig. 5)
The integrated upper lid 68a and lower lid 68b are sealed by holding the handle 80 and screwing the cylindrical body 70 of the lower lid 68b into the screw portion of the socket 73a. At this time, the knob A 71a is moved to the nut 77 provided in the vicinity of the work surface opening 64, and the screwing position is fixed. At this time, the packing 69a of the upper lid 68a is in contact with the periphery of the work surface opening 64, and the lower lid packing 69b is in contact with the end cover plate 73b of the three-dimensional exhaust hepa filter main body 67, thereby maintaining a sealed state. (Fig. 6)
In order to discard both the three-dimensional exhaust hepa filter 65 and the lower lid 68b screwed together, the integrated upper lid 68a and lower lid 68b are divided. The connecting knob A 71 a is removed, and the knob A 71 a is inserted into the upper lid fixing hole 74 and screwed into the nut 77.
The knob B71b is screwed into the upper lid connecting hole 75 of the upper lid 68a from which the knob A71a has been removed to close the hole at the time of division, and the airtightness is maintained. (Fig. 6)
When removing the three-dimensional exhaust hepa filter 65, the maintenance cover 62 of the isolator 51 is opened, and the lock catch 79 that fixes the three-dimensional exhaust hepa filter 65 is unlocked from the bottom of the work surface 63. The three-dimensional exhaust hepa filter 65 is removed, taken out of the isolator 51 and discarded. (Fig. 7)
The three-dimensional exhaust hepar filter for replacement can be easily fixed and sealed by hooking the lock catch 79 to the lower part of the work surface 63 and lowering the lever of the lock catch 79, and the maintenance lid 62 is closed. After the installation of the three-dimensional exhaust hepa filter 65 is completed, the knob A71a for fixing the upper lid 68a that has sealed the opening 64 of the work surface 63 is removed, and the upper lid 68a and screws are put into the disposal box 61 and discarded. Replacement of the exhaust hepa filter 65 is completed.

A connection structure of the upper lid 68a and the lower lid 68b will be described.
The upper lid 68a and the lower lid 68b are connected and integrated outside the isolator 51 in advance. This is performed in order not to contaminate the mating surfaces of the upper lid 68a and the lower lid 68b with the dangerous particulate matter, and the dangerous particulate matter is scattered outside the isolator 51 when the upper lid 68a and the lower lid 68b are divided. It is for suppressing. For the integration, the upper lid 68a and the lower lid 68b are overlapped, and the knob A 71a is inserted into the upper lid connecting hole 75 from the upper lid side and screwed with the lower lid connecting screw hole 76 of the lower lid 68b to be integrated.

A divided structure of the upper lid 68a and the lower lid 68b will be described.
The upper lid connecting screw hole 75 and the lower lid connecting screw hole 76 that have connected the upper lid 68a and the lower lid 68b are screwed together by a lower lid connecting screw hole 76 that is screwed into the knob A 71a and processed into the lower lid 68b. Yes. The upper lid 68a and the lower lid 68b are divided into a festival where the three-dimensional exhaust hepa filter 65 is sealed with the lower lid 68b and then discarded together with the hepa filter 65. At this time, if the knob A71a that connects the upper lid 68a and the lower lid 68b is removed, the airflow flow sealability cannot be maintained by the upper lid coupling screw hole 75 of the upper lid 68a. The upper lid connecting screw hole 75 has a screw hole having a larger size than that of the lower lid connecting screw hole 76. When the three-dimensional exhaust hepa filter 65 is separated, the upper lid connecting screw 75 is adjusted by a knob B71b that fits the upper lid connecting screw hole 75. A seal washer 82 is sandwiched and tightened to be screwed into the hole to further improve the sealing performance, and an O-ring for maintaining the sealing performance is attached to the sealing washer 82. The length of the screw portion of the knob B 71b that closes the hole is such that it does not reach the lower lid 68b, and the lower lid connecting screw hole 76 is shorter than the thickness of the lower lid 68b, so air flows even when the knob A 71a is removed. Even if the upper lid 68a and the lower lid 68b are separated, the airtightness can be maintained (FIGS. 4 and 5).

Next, blockage of the opening 66 of the three-dimensional exhaust hepa filter 65 by the integrated upper lid 68a and lower lid 68b will be described.
The integrated lower lid 68b closes the three-dimensional exhaust hepa filter main body 65 when the three-dimensional exhaust hepa filter main body 65 is clogged or discarded during regular maintenance, and the collected dangerous substance does not scatter. It is used to make it. The lower lid 68b has a diameter capable of closing the three-dimensional exhaust hepa filter opening 66, and a cylindrical body 70 is disposed on the lower surface. The periphery of the cylindrical body 70 has a male screw structure that matches the socket 73, and the cylindrical body 70 and the socket 73a are screwed together. The cylindrical body 70 can be screwed into the socket 73a provided in the three-dimensional exhaust hepa filter opening 66 by screwing it with the handle 80 of the integrated upper lid 68a and lower lid 68b. Yes. When the packing 69b is arranged along the lower surface of the lower edge of the lower lid 68b and the lower lid 68b is screwed into the socket 73a, the packing 69b is brought into pressure contact with the three-dimensional exhaust hepa filter 65 so as to be sealed.
The integrated upper lid 68a is used to close the work surface opening 64 of the isolator 51.

DESCRIPTION OF SYMBOLS 1 Isolator 2 Working room 3 Front door 4 Glove port 5 Working glove 6 Gas flow path 6a Communication path 6b Communication path 7 Wall surface 8 Exhaust hepa filter 8a Used contaminated hepa filter 8b New hepa filter 9a For filter fixing Stud bolt 9b Filter fixing nut 9c Filter fixing bracket 10 Back plate 11a Bag-in bag-out port 11b Bag-in bag-out cover 12 Bag 12a New bag 13 Working gloves 14 Circulating fan 15 Outdoor exhaust port 16 Air supply hepa filter 17 Heat seal 18a Rubber ring 18b Rubber ring 18c Rubber ring 51 Isolator 52 Work room 53 Exhaust chamber 54 Exhaust blower 55 Prefilter 56 Supply air blower 57 Supply air hepar filter 58 Front door 59 Working hand Bag 60 Pass box 61 Disposal box 62 Maintenance door 63 Work surface 64 Work chamber side opening 65 Three-dimensional exhaust hepa filter 66 Hepa filter opening 67 Filter body 68a Upper lid 68b Lower lid 69a Upper lid packing 69b Lower lid packing 70 Cylindrical body 71 Locking member 71a Knob A
71b Knob B
73a Socket 73b End cover plate 74 Upper lid coupling fixing hole 75 Upper lid coupling screw hole 76 Lower lid coupling screw hole 77 Nut 78 Hepa packing 79 Catch with lock 80 Handle 81 Punching plate 82 Seal washer 83 Body case 84 Cavity

A schematic cross section of the isolator is shown in FIG.
The isolator 1 has a front door 3 in front of the negative pressure working chamber 2, and a work glove 5 is provided in a state in which a hand can be inserted from outside into a glove port 4 provided in the front door 3. The back surface of the negative pressure working chamber 2 forms an air flow channel 6 across the wall surface 7, and the negative pressure working chamber 2 and the air flow channel 6 are connected to each other at the lower portion of the air flow channel 6 by communication paths 6 a and 6 b. communication path 6a, the inter-6b, Pas filter 8 is fixed by the filter fixing stud bolt 9a and a nut 9b to exhaust.

The first aspect of the present invention is a cylindrical bottom having a dust-capturing hepa filter opening 66 at the top, which is installed facing the work chamber side opening 64 for discharging dust provided in the work chamber 52. The hepa filter opening 66 of the three-dimensional exhaust hepa filter 65 comprises a two-layered cover of an upper cover 68a and a lower cover 68b for closing the working chamber side opening 64 and the hepa filter opening 66, and The lid is provided with a locking member 71 composed of a knob A 71a and a knob B 71b for fixing and integrating the two lids with each other or separating them from each other. When taking out from 51, it is possible to close the hepa filter opening 66 with the lower lid 68b and the working chamber side opening 64 with the upper lid 68a.

Three-dimensional exhaust HEPA filter 65 of the present invention is installed through the working chamber side opening mouth portion 64 at the bottom of the working chamber 52 of the isolator, the sealing lid overlaid two upper cover 68a and the lower cover 68b in the opening 64 Therefore, the opening 66 of the three-dimensional exhaust hepa filter 65 is kept airtight by the lower lid 68b, and the isolator 51 is accommodated in the three-dimensional exhaust hepa filter 65 without leaking contaminated air in the hepa filter to the outside. The object to be processed can be taken out.
Further, in order to prevent leakage due to breakage during transportation, if the three-dimensional exhaust hepa filter 65 is placed in a sealed bag (plastic bag) and further sealed by heat sealing or the like, the sealing performance can be further maintained. .

Next, the structure of the three-dimensional exhaust hepa filter 65 in the isolator 51 provided with the three-dimensional exhaust hepa filter 65 and its replacement means will be described with reference to the drawings.
The isolator 51 shown in FIG. 3 has an exhaust chamber bar 53 disposed below a work chamber 52 made of a box that occupies the upper half of the apparatus, and sucks outside air into the upper portion of the work chamber 52 via a prefilter 55. An air supply blower 56 and an air supply hepa filter 57 are provided to supply air to the work chamber 52 through these. The air containing the dangerous particulate matter scattered in the work chamber 52 passes through the punching plate 81 between the work chamber 52 and the three-dimensional exhaust hepa filter 65 and enters the work chamber side opening 64 and the three-dimensional exhaust hepa filter opening 66. Only clean air is blown into the exhaust chamber 53 through a three-dimensional exhaust hepa filter 65 provided in the exhaust chamber 53, and is discharged outside the apparatus by the exhaust blower 54.
A front door 58 having work gloves 59 is provided in front of the work chamber 52, a pass box 60 is provided on the side of the work chamber 52, and a disposal box 61 is provided on the work surface 63. A maintenance door 62 is provided in the exhaust chamber 53 so that a hepa filter to be discarded can be taken out.

The structure of the three-dimensional exhaust hepa filter 65 will be described.
As shown in FIGS. 3 to 7, the three-dimensional exhaust hepa filter 65 includes a filter main body 67 formed of a bottomed cylindrical body having an opening 66 at the top and a peripheral wall as a filter medium, an upper lid 68a for closing the opening 66, and A socket 73a that has a three-dimensional shape including the lower lid 68b and is screwed into the lower lid 68b is disposed in the opening 66 at the top of the filter body 67 that sucks air.
The three-dimensional exhaust hepa filter 65 is fixed to the lower surface of the work surface 63 of the isolator 51 by a catch 79 with a lock as shown in FIG. If the three-dimensional exhaust hepa filter 65 is a three-dimensional (quadrangular cylinder type), clean air is blown out from four surfaces, and pressure loss can be suppressed.

An initial state before replacement of the three-dimensional exhaust hepa filter 65 will be described.
3 to 7, the normal use state of the three-dimensional hepa filter 65 is fixed by a catch 79 with a lock to a work chamber side opening 64 below the work surface 63 of the isolator 51 and is kept airtight by a hepar packing 78. ing.
The dangerous particulate matter scattered in the working chamber 52 of the isolator 51 passes through the punching plate 81 on the floor of the working chamber , the working chamber side opening 64, and the three-dimensional hepa filter opening 66 and is collected by the three-dimensional exhaust filter 65. Clean air blows around the hepa filter. The replacement time of the three-dimensional hepa filter 65 is clogged by dangerous particulate matter, or when the periodic replacement time is reached, the upper lid 68a and the lower lid 68b are fixed to the filter body 67 and sealed, and the isolator 51 is sealed from the maintenance door 62. Take it out.

The upper lid 68a is configured as follows.
The upper lid 68a is used to close the opening 64 when the hepa filter main body 67 installed below the work chamber side opening 64 following the work surface 63 of the work chamber 52 of the isolator 51 is taken out.

A procedure for replacing the three-dimensional exhaust hepa filter 65 will be described.
As shown in FIGS. 3, 5, and 6, the upper lid 68a and the lower lid 68b are attached to the three-dimensional exhaust hepa filter 65 as follows. The three-dimensional hepa filter 65 is removed from the isolator 51 and discarded. At this time, in order to prevent re-scattering of the dangerous particulate matter from the three-dimensional hepa filter 65, the working chamber side opening 64 and the three-dimensional hepa filter opening 66 are closed in a state where the upper cover 68a and the lower cover 68b are integrated. Prevent and disperse particulate matter.
The upper lid 68a, the lower lid 68b, the knob A 71a and the knob B 71b integrated outside the isolator 51 are put into the work chamber 52 from the pass box 60.
The replacement work in the work chamber 52 is performed by fitting work gloves 59 attached to the front door 58 of the isolator 51. When the integrated upper lid 68a and lower lid 68b are attached, the punching plate 81 is removed. (Fig. 5)
The integrated upper lid 68a and lower lid 68b are sealed by holding the handle 80 and screwing the cylindrical body 70 of the lower lid 68b into the screw portion of the socket 73a. At this time, the knob A 71a is moved to a nut 77 provided in the vicinity of the working chamber side opening 64 so that the screwing position is fixed. At this time, the packing 69a of the upper lid 68a is in contact with the periphery of the working chamber side opening 64, and the lower lid packing 69b is in contact with the end cover plate 73b of the three-dimensional exhaust hepa filter main body 67, thereby maintaining a sealed state. (Fig. 6)
In order to discard both the three-dimensional exhaust hepa filter 65 and the lower lid 68b screwed together, the integrated upper lid 68a and lower lid 68b are divided. The connecting knob A 71 a is removed, and the knob A 71 a is inserted into the upper lid fixing hole 74 and screwed into the nut 77.
The knob B71b is screwed into the upper lid connecting hole 75 of the upper lid 68a from which the knob A71a has been removed to close the hole at the time of division, and the airtightness is maintained. (Fig. 6)
When removing the three-dimensional exhaust hepa filter 65, the maintenance cover 62 of the isolator 51 is opened, and the lock catch 79 that fixes the three-dimensional exhaust hepa filter 65 is unlocked from the bottom of the work surface 63. The three-dimensional exhaust hepa filter 65 is removed, taken out of the isolator 51 and discarded. (Fig. 7)
The three-dimensional exhaust hepar filter for replacement can be easily fixed and sealed by hooking the lock catch 79 to the lower part of the work surface 63 and lowering the lever of the lock catch 79, and the maintenance lid 62 is closed. After the installation of the three-dimensional exhaust hepa filter 65 is completed, the knob A71a for fixing the upper lid 68a that has sealed the opening 64 of the work surface 63 is removed, and the upper lid 68a and screws are put into the disposal box 61 and discarded. Replacement of the exhaust hepa filter 65 is completed.

Next, blockage of the opening 66 of the three-dimensional exhaust hepa filter 65 by the integrated upper lid 68a and lower lid 68b will be described.
The integrated lower lid 68b closes the three-dimensional exhaust hepa filter main body 65 when the three-dimensional exhaust hepa filter main body 65 is clogged or discarded during regular maintenance, and the collected dangerous substance does not scatter. It is used to make it. The lower lid 68b has a diameter capable of closing the three-dimensional exhaust hepa filter opening 66, and a cylindrical body 70 is disposed on the lower surface. The periphery of the cylindrical body 70 has a male screw structure that matches the socket 73, and the cylindrical body 70 and the socket 73a are screwed together. The cylindrical body 70 can be screwed into the socket 73a provided in the three-dimensional exhaust hepa filter opening 66 by screwing it with the handle 80 of the integrated upper lid 68a and lower lid 68b. Yes. When the packing 69b is arranged along the lower surface of the lower edge of the lower lid 68b and the lower lid 68b is screwed into the socket 73a, the packing 69b is brought into pressure contact with the three-dimensional exhaust hepa filter 65 so as to be sealed.
The integrated upper lid 68a is used to close the working chamber side opening 64 of the isolator 51.

Claims (1)

  A cylindrical bottomed three-dimensional shape installed facing the work chamber side opening (64) for discharging dust provided in the work chamber (52) and having a hepa filter opening (66) for taking in dust at the top. An upper lid (68a) and a lower lid (68b) for closing the working chamber side opening (64) and the hepa filter opening (66) in the hepa filter opening (66) of the exhaust hepa filter (65). And the lid is provided with a knob (71a) that allows the two lids to be fixed and integrated with each other or separated from each other. The hepa filter opening (66) can be closed with the lower lid (68b) and the work surface opening (64) can be closed with the upper lid (68a). Filter (65) How to replace.

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