JPS6145200B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical filter with an annular cross section, which is supplied with a gas flow from the inside and which can be pressed at the end side into a communication opening in an intermediate bed in a casing, which is opened for filter replacement. and a device for compressing the filter in a gas-tight manner into the communication opening, the intermediate bed forming a partition between the inflow chamber and the outflow chamber of the casing, in order to remove radioactive harmful substances from the gas stream. Concerning filter casing for separation.

When replacing the filter remotely in a casing of the type described above, it is necessary to prevent radioactive particles from reaching the clean air side of the filter casing from the unpurified air side and impairing the separation efficiency of the filter. Furthermore, it is necessary to prevent free radioactive particles from being transported from contaminated parts of the filter into the surrounding environment, for example into the filter chamber, or from reaching the inside of the filter casing and contaminating it. This problem has been attempted to be addressed by hydraulically driven dual closure devices. However, this requires a special drive with auxiliary energy attached to the filter housing. If that drive fails, closure is no longer guaranteed. Repair or disassembly of the drive is problematic due to the high radioactivity of the filter. Additionally, unpurified air may be routed to the clean air side of the filter through the communication points of the double closure device, impairing the separation efficiency of the filter.

The object of the present invention is to satisfy the above-mentioned conditions and to close the opening between the unpurified air side and the clean air side of the filter casing and the suction opening of the filter by a reliable device before disassembly. . Moreover, during operation of the filter, this device tends to open the above-mentioned openings to the gas flow.

According to the invention, this object is achieved by providing, in the filter casing mentioned at the outset, a closing valve that can be separated into two parts, the upper part of which is located at the suction opening of the filter, and the lower part of which is located in the middle. They are each attached to a communication opening in the floor, in which case the upper and lower parts are pressed against each other by a gasket, and the double lid technology forms a contamination-free intermediate chamber between the two end faces, and the inside of the casing is This is achieved by providing a device for lifting the upper and lower parts together by the closing movement of the casing lid in order to open the communication opening in the intermediate floor between the two casing interior chambers when they are pressed together. The invention further provides that the two valve plate parts of the closing valve can be completely separated from each other, the upper valve plate part forming an element of a replaceable filter and the lower valve plate part forming an element of a casing or an intermediate bed. It is proposed that by means of these two valve plate parts each of the respective opposite halves of the valve seat can be closed in the open or disassembled or separated state. For this purpose, the present invention further includes:
A swinging lever is provided on the underside of the intermediate floor, and on one side of the swinging lever a retaining pin is attached via a joint point, which is supported in a vertically movable manner relative to the lower valve plate part of the closing valve. , it is proposed that on the opposite side of the rocking lever a drive rod is engaged which can be driven by the lid.

The double-closed valve is thereby constructed in such a way that the filter as well as the opening in the intermediate bed can be opened and closed optimally and reliably. No auxiliary drive is required for its drive. When closing the filter casing lid, the double closing valve is forced open. Due to the drive mechanism, no airtight areas are created between the unpurified air side and the clean air side of the filter casing. By marking the pressure rod, it can be indicated whether the opening of the filter casing is closed or not. Particular advantages of the filter housing according to the invention are its particularly reliable operation, the elimination of auxiliary drives, and the fact that the tightness of the filter is not compromised due to the double closing mechanism.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In the drawing, a filter casing 1 consisting of a cylindrical chamber is divided into two chambers 3 and 4 by an intermediate bed 2, which has a communication opening 5.
A cylindrical filter 6 of annular cross section is arranged in the upper chamber 3 and is supplied with the gas stream to be purified. This gas flow flows through the bottom 37 of the filter 6.
It enters the filter 6 in the axial direction through the opening 41 located at (see FIG. 2). The filter 6 is driven by a special mechanism in the lid 7 of the casing 1 and is pressed airtight against the intermediate bed 2 in such a way that the filter internal chamber is located with its axial opening above the communication opening 5 in the intermediate bed 2. . The upper chamber 3 has a short gas outlet pipe 9 for clean air, and the lower chamber 4 has a short gas inlet pipe 8 for unpurified air, so that the gas flow to be purified is routed from the lower chamber 4 to the communicating opening. 5 and the upper chamber 3 or from the short gas inlet pipe 8 through the filter 6 to the short gas outlet pipe 9. Internal chambers 3, 4 of casing 1
can be loaded through the opening 10 after opening the lid 7, and the annular or cylindrical filter 6 can be loaded as described above.
is accommodated, the gas flow of the filter 6 takes place from the outer periphery, and the gas supply takes place through the communication opening 5 at its lower end face.

The filter 6 has a packing 11 provided on the filter 6 on an annular intermediate bed 2 provided in the casing 1 between a short gas inlet pipe 8 and a short gas outlet pipe 9, transversely to the casing wall. It is placed through. The filter opening for gas inflow then coincides with the communication opening 5 forming the communication between the housing interior chambers 3 and 4. Filter 6 is centered within casing 1 by ribs 12 . The gas to be purified now enters the lower chamber 4 of the housing 1 through the gas inlet tube 8, flows through the filter 6 and exits the housing 1 again through the gas outlet tube 9.

A closing mechanism for a lid 7 for closing the casing opening 10 is arranged above the intermediate floor 2 . The basic element in that case is a swing arm 13, which is supported in a support bracket 14 on the casing 1 so as to be pivotable around an axle pin 15, which simultaneously moves the lid 7 into the casing 1. At the same time, the filter 6 is pressed against the communication opening 5.

A projection 16 is provided on the underside of the lid 7, which upon pressing presses the drive rod 17 downwards in its guide bush 18. After the lid 7 is opened, the drive rod 17 is moved upward again by the spring back 19 and projects from the upper edge of the casing 1. The drive rod 17 acts with its lower end 20 on a swing lever 21 which is swingably supported on a support bracket 22. This support bracket 22 is attached to the underside of the intermediate floor 2. The guide bushing 18 is tubular and is installed in a gas-tight manner in the intermediate floor 2, with the drive rod 17 passing through the intermediate floor 2. The drive rod 17 is airtight with respect to the guide bush 18 and the upper chamber 3 so that no gas can reach the lower chamber 4 from the upper chamber 3 through the drive rod 17 .

As mentioned above, the swinging lever 21 has its rear joint 23 vertically moved up and down within the housing 1, so that the two-valve plate-shaped closing valves 25, 26 are shown enlarged in FIG. It is swingably supported so as to be raised from the valve seat 27 in the communication opening 5 to positions 25' and 26'. The airtight valve seat 27 consists of a conical surface in the communication opening 5,
divided horizontally. This gas-tight valve seat 27 consists of two halves, the upper half 35 of which is attached to the filter 6 and the lower half 36 to the intermediate bed 2. Each of the valve plates 25 and 26 of the closing valve is opposed to each of these halves 35 and 36, and the upper valve plate 25 and the lower valve plate 26 are held in airtight contact with each other by a packing 28. Since they are in contact with each other, the intermediate chamber 29 will not be contaminated in the state where it is lifted from the valve seat 27 to the positions 25', 26', 28', that is, during operation.

In FIG. 2, an annular grooved gasket 38 is fitted into the bottom 37 of the filter 6, the free end surface of which forms an upper valve seat 35. Since the grooved packing 38 is folded back over the bottom 37 from the opening, the grooved packing 38 is fixedly placed on the filter 6 and is attached to the casing 1 together with the filter 6.
It can be taken out from The annular grooved seal 38 rests on the intermediate floor 2 on its underside, and a squeeze ring 39 is provided on the intermediate floor 2 in the contact area, which increases the pressing force of the seal in a dotted manner. The valve seat 27 is divided horizontally, and its lower half 36 forms a lower closing valve plate 36.
are opposed to each other, so that in the separated state of the two closing valve plates 25 and 26 or in the state in which the filter 6 is removed, only a contaminated linear annular edge 40 is created, in which case this annular edge Rim 40
Dirt is not carried out through the

The lower valve plate 26 of the closing valve is located at the pivot lever junction 2
3 attached to the swing lever 21 and movably guided vertically in the intermediate floor 2
Since the lower valve plate 26 is placed on the lower valve plate 26, the lower valve plate 26 is moved up and down by the movement of the drive rod 17. When the lower valve plate 26 is lifted, the lower valve plate 26 is pressed against the upper valve plate 25 and lifted together with the upper valve plate 25 from the valve seat 27. The two valve plates 25, 26 are then compressed by the spring 31, so that the intermediate chamber 29 is closed and passage through the communication opening 5 is free. The lower valve plate 26 thereby forms an element of the housing 1 and always remains connected to the housing 1. However, the upper valve plate 25
is one element of the filter 6. The upper valve plate 25 has its mounting pin 34 used as a height stopper;
It slides in a guide 32 fixedly placed inside the upper cover plate 33 of the filter 6. In that case spring 3
1 on the one hand, in the operating state both valve plates 25, 26;
on the other hand, when the lid of the filter casing is opened or the filter is removed, the upper valve plate 25 is compressed by the gasket 11 of the filter 6.
Used for pressing.

The operation of the two-plate plate closure valves 25, 26 is summarized as follows.

The filter 6 is inserted into the chamber 3 when the lid 7 is opened. The lower opening of the filter 6 is connected to the spring 31
It is closed by the upper valve plate 25 of the closing valve, which is pressed against its valve seat by the valve. The lower valve plate 26, which is meanwhile separated from the upper valve plate 25, is pulled onto its valve seat from above by a spring back 19;
In that case, the communication opening 5 in the intermediate floor 2 is made airtight. When the filter 6 is placed on the intermediate floor 2, the lid 7 is closed and the drive rod 17 is moved to the swing lever mechanism 2.
1, 22, and 23, so both valve plates 2 are lifted with the gasket 28 inserted.
5 and 26 are pressed together and lifted upward from the valve seat 27 in the communication opening 5 to the stopper.
The housing 1 is thereby closed by the lid 7 and at the same time the path through the communication opening 5 is freed so that the gas flow from the lower chamber 4 to the upper chamber 3 can begin.

The double closing valve according to the invention provided in the above-mentioned communication opening is driven via a swing lever rotatably or swingably supported inside the filter casing. The swinging lever is forcibly controlled by the closing filter casing lid 7 via a drive rod and presses the double closing valves 25, 26 upwards, so that when the filter casing lid 7 is closed, there is no communication. Aperture 5 is left free. When opening the filter casing lid 7, the rocking lever is actuated by gravity and spring force, and the closing valves 25, 26 are moved downwards until the communication opening 5 is closed again.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a filter casing according to the invention, and FIG. 2 is an enlarged detailed view of the Z section in FIG. 1... Filter casing, 2... Intermediate floor, 3
...Upper side chamber, 4...Lower side chamber, 5...Communication opening, 6
... Filter, 7 ... Lid, 8 ... Gas inlet short pipe,
9... Gas outlet short pipe, 10... Casing opening,
DESCRIPTION OF SYMBOLS 11... Packing, 12... Rib, 13... Swing arm, 14... Support bracket, 15... Swing shaft pin, 16... Protrusion, 17... Drive rod, 18...
...Guide button, 19...Spring pack, 20...
Lower end, 21... Swing lever, 22... Support bracket, 23... Swing lever junction, 24... Longitudinal axis of casing, 25... Upper valve plate of closing valve, 26... Closing valve lower valve plate, 27...valve seat,
28...Packing, 29...Intermediate chamber, 30...Pin, 31...Spring, 32...Guide, 33...Filter cover plate, 34...Pin.

Claims (1)

[Scope of Claims] 1. A cylindrical filter with an annular cross section, which is supplied with a gas flow from inside and whose end face can be pressed into a communication opening in an intermediate bed in a casing, a lid that can be opened for filter replacement, and a device for pressing the filter in a gas-tight manner into the communication opening, the intermediate bed forming a partition between the inflow chamber and the outflow chamber of the casing; In the casing, it has a closing valve that can be separated into two parts, the upper part 25 of which is attached to the suction opening of the filter 6 and the lower part 26 of the closing valve to the communication opening 5 in the intermediate bed 2. At that time, both the upper and lower parts 25,
26 are made to be pressed together by a seal 28 and form a clean intermediate chamber between the two end faces in a double lid technique, with the upper and lower parts 25, 26 pressed together inside the casing 1. Separation of radioactive hazardous substances from the gas stream, characterized in that a device is provided for lifting them together by the closing movement of the casing lid 7 in order to open the communication opening 5 in the intermediate bed 2 between the two casing internal chambers 3, 4. Filter casing for. 2. The two plate parts 25, 26 of the closing valve can be completely separated from each other, the upper plate part 25 carrying an element of the replaceable filter 6 and the lower plate part 26 carrying an element of the casing 1 or the intermediate bed 2. valve seats 2 formed respectively and facing each other by these two parts;
2. A filter casing according to claim 1, wherein each half of the filter casing 7 can be closed in an open state, a disassembled state, or a separated state. 3 Swinging lever 21 that can be swung below the intermediate floor 2
is provided, on one side of the pivoting lever 21 a retaining pin 30 is mounted via a junction 23, which is supported in a vertically movable manner relative to the lower valve plate portion 26 of the closing valve, and on the opposite side of the pivoting lever 21 3. The filter casing according to claim 1, wherein a drive rod 17 is engaged which can be driven by the lid 7.