JPH0217000B2 - - Google Patents

Description

[Detailed description of the invention]

[Object of the Invention] (Industrial Application Field) The present invention relates to an underwater vacuum cleaner for underwater cleaning the bottom of a fuel pool, site bunker pool, reactor well tier, bulkhead bottom, and other pit bottoms of nuclear power facilities. (Prior art) Nuclear facilities are generally equipped with a fuel pool for storing spent fuel, a site bunker pool for storing waste generated within the nuclear power plant, and various other pits. Water is stored in the pit. By the way, fallen objects such as radioactive crud, bolts, nuts, and vinyl wires accumulate at the bottom of such pools and pits.
During periodic inspection work, etc., there was a problem in that the radioactive deposits that had accumulated increased the radiation dose of workers. For this reason, in the past, in order to clean the bottom of a pool or pit underwater,
Two types of underwater vacuum cleaners were used, as shown in the figure. The specifications and drawbacks of these two types of underwater vacuum cleaners will be explained below. (Problems to be Solved by the Invention) The underwater vacuum cleaner of the type shown in FIG.
A strainer (not shown) attached to the suction port 2 prevents the intrusion of vinyl wires, wires, bolts, nuts, paint, etc., and prevents small debris (such as sand,
etc.) is a two-stage processing type in which the filter 3 collects the waste. However, since pump 1 and filter 3 are integrated, once pump 1 is used, it is not possible to lift only pump 1 into the air, and even if pump 1 breaks down, maintenance and inspection in air is impossible. 3 required a large amount of space for storage and disposal. In the type of underwater vacuum cleaner shown in FIG. 2, a pump 5 is installed in the air, that is, on an operating floor 10, and the pump 5 is operated by a control panel 11 to utilize the suction force of the pump 5. This type sucks clean water from a pool or pit 6 through an ejector 7, and uses the differential pressure generated by the flow of water in the ejector 7 to suck in dirt. This is a two-stage treatment type using a filter 3 provided in a tank 4. This filter 3 is also of the cartridge type. However, with this type of underwater vacuum cleaner, although it is possible to perform maintenance and inspection of the pump 5 in the air, the suction hose 8 that sucks clean water from the pool or pit 6, the suction port 2 that sucks in dirt, the suction pipe 9, Furthermore, since the ejector 7 is required, the device becomes large and has the disadvantage of poor operability. As mentioned above, the two conventional types of underwater vacuum cleaners have a two-stage process of a strainer at the suction port 2 and a filter 3, and their dust collection capacity is small, so they use a cartridge-type filter 3. For,
Storage space for the large filter 3 is required,
Other types have the disadvantage that maintenance and inspection of the pump 1 in air is not possible, and other types have poor operability. The present invention has been made in view of these points, and by using a cyclone separator, the dust collection capacity is increased, and by using a baggage filter, the volume of the filter can be reduced.
In addition, by making it possible to remove the pump underwater, maintenance and inspection of the pump can be carried out in the air, and the main body of the device has been made smaller, improving operability, and the submersible vacuum cleaner can be stored under air except for the filter. The purpose is to provide. [Structure of the Invention] (Means for Solving the Problems) The present invention provides a suction port for sucking in dirt, a suction pipe connected to the suction port, and a suction pipe connected to the suction pipe to remove the sucked dirt. A cyclone separator that separates items with high specific gravity from those with low specific gravity, a collection tank that collects garbage with high specific gravity, a submersible pump equipped with a bag filter that collects garbage with low specific gravity, and a rod-shaped fixing frame. and a pressing device provided at the upper end of the pedestal,
A submersible pump to which a collection tank, a cyclone separator, and a bag filter are attached are formed so as to be separable from each other, and are arranged in this order from bottom to top along the pedestal, and the collection tank is attached to the lower end of the pedestal. A submersible pump for a nuclear power plant, characterized in that a submersible pump to which a collection tank, a cyclone separator, and a bug filter are attached are crimped and fixed to each other by mounting and fixing the submersible pump and pressing the submersible pump downward with the pressing device. It's a vacuum cleaner. (Example) Hereinafter, the present invention will be explained using examples shown in FIGS. 3 and 4. In the figure, garbage 12, which is fallen objects such as radioactive metal, bolts, nuts, and vinyl wire, is accumulated at the bottom. The configuration of the present invention includes a suction port 13 that sucks dust 12, and a suction pipe 1 connected to the suction port 13.
4 and a suction hose 15, a cyclone separator 16 connected to the suction hose 15 to separate the dust 12 sucked in into those with high specific gravity and those with low specific gravity, and a cyclone separator 16 connected to the lower side of this cyclone separator 16 to separate the dust 12 with high specific gravity. Collection tank 17 to collect
, a submersible pump 18 that is connected to the upper part of the cyclone separator 16 and can be driven underwater, and a bag filter 19 that is connected to the tip of the submersible pump 18 and collects dirt with low specific gravity. A submersible pump 18 to which a collection tank 17, a cyclone separator 16, and a bag filter 19 are attached is connected and fixed to a single pedestal 20, and a rope 21 is attached to the tip of this pedestal 20. The frame 20 is fixed to a handrail (not shown) of the fuel exchanger and is moved by operating the fuel exchanger. Further, the suction pipe 14 is attached to an auxiliary hoist 22 of the fuel exchanger, and by operating the auxiliary hoist 22, the suction pipe 14 and the suction port 13 are moved. Small movements of the suction port 13 are performed by an operator on the refueling machine by moving the handle 23. The suction port 13 is of a replaceable structure, with several types available depending on the shape of the place to be decontaminated. A strainer (not shown) is attached to the suction port 13 to prevent large particles from entering. The collection tank 17 can be separated from the pedestal 20 underwater, and has a structure that allows the lid 24 to be attached underwater. In addition, the submersible pump 18 to which the bug filter 19 is attached and the cyclone separator 16 are also screwed (pressing device) 2.
The structure is such that it can be separated from the pedestal 20 by rotating 5. Furthermore, since the bag filter 19 is made of a bag-type flexible material, its volume can be reduced and requires almost no storage space. Next, the effect will be explained. The motor of the submersible pump 18 is rotated by pressing a switch on a control panel installed in the air, and the suction force generated by the rotation of the motor sucks the dirt 12 together with water from the suction port 13. At this time, remove bulky waste such as vinyl wire and bean sen from the suction port 1.
3 strainers. The dust 12 sucked in from the suction port 13 passes through the suction pipe 14 and the suction hose 15 to the cyclone separator 16.
flows to Therefore, the swirling flow of the cyclone separator 16 is used to remove bulky debris with a high specific gravity, such as
Bolts, nuts, screws, coarse paint, coarse vinyl, coarse sand, coarse clay, etc.) are collected in the collection tank 17.
Fine dust with low specific gravity (for example, fine paint, fine vinyl, fine sand, fine clay, etc.) is collected by a bag filter 19 via a submersible pump 18. Also, by loosening the screw 25 and pulling the wire 26 upward, the submersible pump 18 and bag filter 1 can be connected.
9 is separated from the cyclone separator 16 and lifted into the air, the bag filter 19 can be replaced and the submersible pump 18 can be maintained and inspected. Further, the collection tank 17 can be separated by separating the connection mechanism (not shown) from the pedestal 20, then put on the lid 24, lifted into the air, and moved to a storage location. In this way, the submersible pump 18 to which the bag filter 19 is attached and the cyclone separator 16 can be separated by simply loosening the screws 25, so that the working time can be shortened. Conversely, these devices can be assembled in a short time by simply connecting the devices and tightening the screws 25. Since the working time is thus short, the radiation exposure dose of the workers can be reduced. Next, the underwater vacuum cleaner of the present invention and the above-mentioned types will be compared and explained with reference to Tables 1 to 4. As can be seen from the objects to be collected in Tables 1 to 3, the apparatus of the present invention handles the garbage 12 in three stages: pre-treatment, intermediate treatment, and final treatment.
Depending on the process, the dust 12 can be collected depending on its size, increasing the collection capacity of the dust 12. In addition, as shown in Table 4, actual experiments have shown that the underwater vacuum cleaner of the present invention is superior to the above-mentioned types and types in terms of the collection of dust 12, the lifespan of the filter, and the possibility of reducing the volume of the filter. From the vacuum cleaner of
Turns out it's much better. (Effects of the Invention) As described above, the underwater vacuum cleaner of the present invention has a large garbage collection capacity because it is processed in three stages: the strainer at the suction port, the cyclone separator, and the baggage filter. can be reduced in volume, and does not require a large space for filter storage or disposal. Furthermore, since the submersible pump with the bug filter attached, the cyclone separator, and the collection tank can be separated underwater, maintenance and inspection in the air is easy, and the small size makes it easy to operate. Furthermore, the submersible pump to which the collection tank, cyclone separator, and bag filter are attached can be easily crimped and fixed and divided using a pressing device, so that it can be removed and assembled in a short time. In particular, the dust and debris handled by this device are highly radioactive materials, and by shortening the work time, it is possible to reduce the radiation exposure dose of the operator. It can also be used to remove radioactive deposits.

【table】

【table】

[Table] ◎ Processed water amount
^12m3 /hr

[Table] ◎ Processed water amount
^18m3 /hr

【table】 [Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of a conventional underwater vacuum cleaner (type), FIG. 2 is a schematic diagram showing the configuration of a conventional underwater vacuum cleaner (type), and FIG. 3 is a schematic diagram showing the configuration of a conventional underwater vacuum cleaner (type). FIG. 4 is a schematic diagram showing an embodiment, and FIG. 4 is a perspective view showing an underwater vacuum cleaner of the present invention. 12... Garbage, 13... Suction port, 14... Suction pipe, 16... Cyclone separator, 17... Collection tank, 18... Submersible pump, 19... Buzz filter.

Claims (1)

[Claims] 1. A suction port for sucking in dust, a suction pipe connected to this suction port, a cyclone separator connected to this suction pipe to separate the sucked in dust into those with high specific gravity and those with low specific gravity, and a cyclone separator with high specific gravity. Equipped with a collection tank for collecting dust, a submersible pump equipped with a bag filter for collecting dust with low specific gravity, a rod-shaped fixing frame, and a pressing device provided at the upper end of this frame, collection tank,
A submersible pump to which a cyclone separator and a bag filter are attached is formed so as to be separable from each other, and are arranged in this order from bottom to top along the pedestal, and the collection tank is attached and fixed to the lower end of the pedestal, By pressing the submersible pump downward with the pressing device, the collection tank, cyclone separator,
A submersible vacuum cleaner for a nuclear power plant, characterized in that a submersible pump to which a filter is attached and a submersible pump are fixed to each other by crimping.