JPS6230000Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a dust suction device for nuclear power equipment.

In general, most of the dust generated in the reactor building of a nuclear power plant, for example, is radioactive, and such dust is configured to be sucked and collected by a dust suction device. This dust suction device is connected to suction piping installed throughout the working area of the reactor building, sucks air through the suction piping, and collects dust contained in the suctioned air. It is equipped with a separate suction mechanism, and connectors are provided at various locations on the suction piping. Then, a cleaning hose is connected to these connectors, and the dust inside the building is sucked together with air by the cleaning hose.The suctioned dust is carried along with the air through the suction piping, where it is collected and processed by the suction mechanism. It is configured so that only air from which dust has been removed is exhausted to the outside. By the way, as these devices are used, radioactive dust accumulates on the inner surface of the suction piping, resulting in an increased radiation dose for workers working near the suction piping. but,
In conventional pipes, no consideration was taken to remove such accumulated dust, making it difficult to clean the inside of the piping. For this purpose, a cleaning body having a diameter larger than the diameter of the suction pipe and having elasticity is sucked into the suction pipe, and this cleaning body is moved inside the suction pipe by negative suction pressure to remove the dust accumulated on the inner surface of the suction pipe. It is possible to remove it mechanically. However, the suction pipe is divided into many branch pipes, and the branch pipes at the end are collectively connected to pipes with larger diameters. Therefore, even if the cleaning body is sucked from the branch pipe at the end, if the cleaning body passes through the branch pipe at the end and enters the pipe with a larger diameter, the cleaning body will not come into sliding contact with the inner surface of the pipe, and the pipe will It becomes impossible to remove dust that has accumulated on the inner surface of the Therefore, such a cleaning body can only clean the terminal branch pipe of the suction piping, and cannot clean the entire suction piping. Further, when dust is sucked, large foreign objects may be sucked in addition to fine dust, and these foreign objects may get caught in the middle of the suction piping. In order to remove foreign objects caught in the middle of the suction piping, with conventional methods, it is necessary to disconnect the suction piping, which makes it troublesome and difficult to remove the foreign objects. There was a problem where workers were exposed to a large amount of radiation.

The present invention was developed based on the above circumstances, and its purpose is to provide a dust suction device for nuclear power equipment that can easily clean the entire suction pipe and easily remove trapped foreign objects. .

The present invention will be described below with reference to an embodiment shown in the drawings.

One example of this is a dust suction device for a reactor building 1 of a nuclear power plant. A reactor containment vessel 2 is housed within a reactor building 1 . Further, a suction pipe 3 is arranged within the reactor building 1. The suction pipe 3 is composed of a large diameter collecting pipe 4 and a large number of small diameter branch pipes 5 which are branched and connected to the collecting pipe 4 and arranged on each work floor in the reactor building 1. Note that the actual suction piping 3 has a more complex configuration than in Figure 1, consisting of many pipes with different diameters, but the piping system is simplified in Figure 1 for ease of understanding. It is something. A large number of connectors 6 are provided at the tip and intermediate portions of each branch pipe 5, respectively. Further, the collecting pipe 4 is connected to a suction mechanism 7 via a flange 22, and is configured to suck air through the suction pipe 3. A safety valve 21 is provided at the upper end of the collecting pipe 4 to keep the intake negative pressure below a certain level. The connector 6 is screwed onto the branch pipe 5 as shown in FIG.
It consists of a lid 9 that can be opened and closed and is pivotally connected to a connection port 8a provided in the main body 8.Open the lid 9 and connect a cleaning hose (not shown) to the main body 8 to perform the cleaning. It is configured to suck dust accumulated on the floor and other surfaces inside the reactor building 1 together with air from a suction nozzle attached to the tip of the hose. The connecting portions 6 are automatically closed when the cleaning hose is removed, so that air is not sucked. The suction mechanism 7 includes a blower 10 that sucks air, and a cyclone dust collector 1 provided upstream of the blower 10.
1, a back filter 12, and a filter 13. Dust contained in the air sucked through the suction pipe 3 is separated and collected by a cyclone dust collector 11 and a back filter 12, and the air from which this dust has been removed is passed through a filter 13 to protect the blower 10, etc. The remaining particles are removed and discharged to the outside. Note that 23 is a damper. Furthermore, dirt cans 14, 14 are attached to the lower portions of the cyclone dust collector 11 and back filter 12, respectively, and the collected dust is configured to accumulate in these dirt cans 14, 14. When a predetermined amount of dust accumulates in these dirt cans 14, 14, these dirt cans 14, 14 are removed and the dust can be collected. In addition, the above dirt can 1
At the bottom of 4 and 14 are wheels 2 for transporting it.
4... is installed. A cleaning port 15 is provided in the middle of the collecting pipe 4 of the suction pipe 3,
Also, similar cleaning ports 16 are provided in the intermediate portions of the branch pipes 5, respectively. As shown in FIG. 3, the cleaning port 15 is branched from a connecting pipe portion 4a connected to the intermediate portion of the collecting pipe 4 so as to be oriented downstream. A flange portion 17 is protruded from the opening end of the cleaning port 15 via a stopper 27, and the flange portion 17 is provided with a lid 1.
8 is detachably attached with bolts 25, etc. Note that 26 is packing. A cleaning port closing body 19 is integrally protruded from the inner surface of the lid body 18 by welding or the like, and this cleaning port closing body 19 fits tightly into the cleaning port 15 and its front end surface is connected to the collecting pipe 4. It is formed in an arc shape so as to be located on the same plane as the inner surface. Further, the diameter of the cleaning port 15 is formed to be slightly larger than the inner diameter of the collecting pipe 4, so that a compressible cleaning body (not shown) having a larger diameter than the inner diameter of the collecting pipe 4 and having elasticity can be easily attached. Configured for insertion. Note that the configuration of the cleaning ports 16 provided in the branch pipes 5 differs only in the diameter of the cleaning ports 1 of the collecting pipes 4.
It has the same configuration as No. 5.

In the embodiment of the present invention configured as described above, when cleaning the suction pipe 3, first open the cleaning port 16 provided in each branch pipe 5, and then clean the suction pipe 3 through the cleaning port 16. A branch pipe cleaning body is pushed into each branch pipe 5. Therefore, this cleaning body moves within the branch pipe 5 while slidingly contacting the inner surface of the branch pipe 5 due to the suction negative pressure, and mechanically removes the dust accumulated and attached to the inner surface of the branch pipe 5. Then, the branch pipes 5 are cleaned. The cleaning body that has passed through the branch pipes 5 reaches the cyclone dust collector 11 via the collecting pipe 4 and is collected by the cyclone dust collector 11. Incidentally, since the collecting pipe 4 has a larger diameter than the branch pipes 5, even if the branch pipe cleaning body passes through the collecting pipe 4, it does not come into sliding contact with the inner surface of the collecting pipe 4, and the collecting pipe 4 is not cleaned. When cleaning of each branch pipe 5 is completed, the lid 18 of the cleaning port 15 of the collecting pipe 4 is opened, and the cleaning body for the collecting pipe is pushed into the collecting pipe 4 through the cleaning port 15. Therefore, this cleaning body moves inside the collecting pipe 4 while slidingly contacting the inner surface of the collecting pipe 4 due to suction negative pressure, and mechanically removes the dust deposited on the inner surface of the collecting pipe 4. It is collected in the cyclone dust collector 11. Therefore, in this way, the suction pipe 3...
It is possible to clean the entire area. Also, branch pipe 5...
If a foreign object or the like is caught in the collecting pipe 4, open the cleaning ports 15, 16, etc.
The foreign matter can be easily removed by inserting a cleaning tool or the like from..., and there is no need to disconnect the branch pipes 5... or the collecting pipe 4 to remove the foreign matter. In addition, in this embodiment, a cleaning port closing body 19 is attached to the lid body 18, and the distal end surface of this cleaning port closing body 19 is configured to be located on the same plane as the inner surface of the pipe, so that foreign particles can be removed. etc., from getting caught on the edges of the cleaning ports 15, 16, . . . .

Note that the present invention is not limited to the above embodiment.

For example, if there are three or more types of suction pipes with different diameters, it is of course necessary to provide a cleaning port for each pipe with a different diameter, or if the pipes have the same diameter but are long or have a complicated shape. It goes without saying that a plurality of cleaning ports may be provided in piping of the same diameter.

Furthermore, the present invention is applicable not only to dust suction devices in nuclear reactor buildings, but also to dust suction devices in general in other nuclear facilities where radioactive dust may be generated.

As mentioned above, the present invention provides a cleaning port into which a cleaning body can be inserted into each pipe of a different diameter in the middle of a suction pipe for dust suction, and a lid body to close the cleaning port, and a lid body that closes the cleaning port. A cleaning palate body protrudingly formed in an arc shape so that its tip end surface is located on the same plane as the inner surface of the suction pipe. Therefore, when cleaning, open these cleaning ports, insert the cleaning body corresponding to the diameter of each pipe, move this cleaning body inside the pipe of each diameter by suction negative pressure, and clean it. Dust accumulated on the inner surface can be removed mechanically, and the entire suction pipe can be reliably cleaned. In addition, if a foreign object gets caught in the middle of the suction pipe, the foreign object can be easily removed by opening the cleaning port and inserting a cleaning tool, etc., without removing the pipe. Radiation exposure also decreases,
Furthermore, the cleaning palate body can prevent foreign matter from getting caught in the cleaning opening. In particular, since the distal end surface of the cleaning port closing body is formed in an arc shape so as to be located on the same plane as the inner surface of the suction pipe, it is possible to effectively prevent the foreign matter from being caught.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being an overall system diagram, FIG. 2 being a side view of the connector, and FIG. 3 being a longitudinal sectional view of the cleaning port. 1... Reactor building, 3... Suction piping, 4... Collection pipe, 5... Branch pipe, 7... Suction mechanism, 10... Blower, 11... Cyclone dust collector, 12... Back filter, 15 , 16... Cleaning port, 18... Lid body, 19... Cleaning port closing body.

Claims (1)

[Scope of utility model registration request] A plurality of branch pipes of different diameters for dust suction installed in a nuclear facility building, a collecting pipe connected to the branch pipes and having a larger diameter than the branch pipes, and a suction mechanism connected to the collecting pipes. and a connector installed in the middle of the branch pipe, and a connector installed in the middle of the branch pipe and collecting pipe so as to be inclined toward the downstream side of the branch pipe, and an elastic member having a larger diameter than the diameter of the branch pipe. a cleaning port having a diameter into which a cleaning body can be inserted; a lid provided on the cleaning port that can be opened and closed; A dust suction device for a nuclear power facility, comprising a cleaning port closing body having a tip portion formed to be flush with a wall surface.