JPH0415710Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a storage tank for vacuum suction transportation, and particularly to a storage tank that enables the discharge operation of stored material while continuously performing the suction transportation operation.

[Prior art] In recent years, industrial waste such as sludge and factory sludge, and household waste such as sewage and sludge have increased, and these wastes are accumulating in solid or liquid form in wastewater treatment facilities, rivers, sewage channels, etc. However, the removal of such waste has become a problem.
On the other hand, at nuclear power plants, etc., during tank inspection work, waste liquid containing a large amount of remaining sludge is removed.
Radioactive waste such as waste resin slurry must be removed in advance. There is a risk of radiation exposure to workers during this removal work, so special care must be taken during this work. Further, storage tanks for sludge and waste resin are equipped with pumps for transporting the sludge, but the pumps have problems such as accumulation of radioactivity and troubles during operation associated with transporting the slurry. As a means of transportation for efficiently and safely removing and processing these wastes, a device has been proposed that uses suction tubes that utilize vacuum power to transport waste by suction from places with height differences or from long distances. .

In this device, a storage tank, a suction transport pipe, and a suction pipe with one end open as an open port are sequentially connected to a vacuum suction device, and the collected material is vacuum-suctioned from the open port of the suction pipe. At this time, if outside air such as the air around the opening of the suction tube is also sucked and transported at the same time,
If the recovered material is liquid or slurry waste, the liquid waste will be sucked in droplets by the very fast air flow in the suction tube and suction transport piping, so It becomes possible to transport it to a certain place or a long distance place. Also,
This also applies when the collected material is solid, and can be easily understood by considering the example of a vacuum cleaner.

In addition, this device is not only used for transporting waste and other materials for treatment as described above, but can also be used to treat residual water in tanks within food factories.
Furthermore, for fish and agricultural products such as radish and cucumber, fluid transport, which transports them together with liquid, is very suitable as a clean and efficient transport means, and has been widely used in recent years.

By the way, the storage tank interposed between the suction transport piping and the vacuum suction device separates the recovered material collected and transported by the vacuum force and air flow from the air flow.
This is a temporary storage tank until it is discharged.

In this case, conventionally, in order to process the accumulated material collected in the storage tank, the vacuum suction device is stopped,
The suction transport work had to be temporarily interrupted before it was started, making the operation complicated and reducing work efficiency. Furthermore, there were other problems such as reduced applicability to processing systems, high cost, and increased risk of exposure when processing radioactive materials.

The storage tank shown in Japanese Patent Publication No. 1247/1983 was developed to overcome these drawbacks. This is because when the liquid level in the receiver tank (storage tank) exceeds a certain level, a valve communicating with the outside air opens.
The internal pressure of the tank is brought to the same level as atmospheric pressure, the suction transport operation is interrupted, the accumulated material in the tank is discharged, and after the discharge is completed, the valve is closed again and the suction transport operation is resumed. In this case, the vacuum suction device continues to operate during the evacuation operation, but the suction and transportation operation has to be interrupted because it is only sucking in and exhausting outside air obtained through the valve. Although this eliminated the complexity of having to stop the vacuum suction device every time a discharge operation was performed, interruption of the suction transport operation could not be avoided, and the work efficiency was still unsatisfactory. Another problem was that the structure was complex, making it difficult to decontaminate areas contaminated with radioactive materials.

[Problems to be solved by the invention] In view of the above-mentioned problems of the conventional example, the purpose of the present invention is to create a system that can discharge collected collected materials while continuously carrying out suction transportation work, and has a simple structure. The purpose is to provide a storage tank.

[Means for solving the problem] The present invention provides an exhaust port and a suction port in the upper part,
a first storage chamber provided at the bottom with a storage material transfer mechanism for transferring stored materials; and a first storage chamber disposed below the first storage chamber and connected to the first storage chamber via the storage material transfer mechanism. a second storage chamber, a stored material discharge mechanism provided at a lower part of the second storage chamber to discharge stored material, a communication pipe that communicates the first and second storage chambers, and the communication pipe. installed in the first and second
A storage tank having a first valve that opens and closes communication between the storage chamber and a second valve that opens and closes communication between the second storage chamber and the outside air, having a hatch that is sealed when the pressure inside the first storage chamber is lower than the pressure inside the second storage chamber, and is opened by the weight of the stored material in the first storage chamber when the pressure inside the first storage chamber is the same; and the stored material transfer mechanism closes the hatch when the pressure inside the second storage chamber is lower than the pressure of the outside air, and when the pressure is the same, the hatch is opened by the weight of the stored material in the second storage chamber. The storage tank is characterized by having:

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The storage tank of the present invention is applied to the vacuum suction device shown in FIG. To briefly explain the apparatus shown in FIG. 3, 1 is a suction tube, and 2 is a collected object. Examples of the recovered material 2 include radioactive waste, used resin, filter sludge, etc., as well as fish, agricultural products, and the like. 3 is a suction transport pipe, 4 is a storage tank, 5
Reference numeral numeral 4 indicates a stored material recovered and stored in a storage tank 4, 6 a vacuum suction device, 7 a discharge valve, and 8 an exhaust pipe.

FIG. 1 is a structural diagram of a storage tank according to an embodiment of the present invention. In the same figure, 9 is the upper chamber (the first
10 is a lower chamber (second storage chamber), 11 is an upper hatch (reservoir transfer mechanism), and 12 is a lower hatch (reservoir discharge mechanism). The upper chamber hatch 11 and the lower chamber hatch 12 are activated when the pressure inside the upper chamber 9 is lower than the pressure inside the lower chamber 10, and when the pressure inside the lower chamber 10 is lower than the external atmospheric pressure. Due to the pressure difference, it is sealed, while
When there is no such pressure difference, it is freely released due to the weight of the stored material 5 stored inside. 13
14 is a collection port, and 14 is an exhaust port, which are connected to the suction transport pipe 3 and the exhaust pipe 8, respectively. 15
16 is a first valve, and 17 is a second valve. The first valve 16 and the second valve 17 are opened and closed by an external timer device (not shown).

FIG. 2 shows an upper chamber hatch 11 and a lower chamber hatch 1.
FIG. 2 is a structural diagram of an example of No. 2. In the figure, 18 is a counterweight, and 19 is a hinge. When there is no pressure difference between the inside and outside of the hatches 11, 12, the hatches 11, 12 and the counterweight 18 are in a balanced state via the hinge 19, as shown in the figure.

In the above configuration, when the first valve 16 is closed by the timer device and the second valve 17 is opened, the third valve
When the vacuum suction device 6 shown in the figure is activated and suction pressure is supplied to the upper chamber 9 via the exhaust pipe 8, negative pressure is applied to the upper chamber 9 and a pressure difference with the lower chamber 10 is created. The upper chamber hatch 11, which had been in use, is sucked upward to seal the upper chamber 9, and the suction transportation operation is started. In this state, the collected material 2 sucked and transported through the suction transport pipe 3 is transported to the collection port 1.
Enter upper chamber 9 from 3. In the upper chamber 9, the collected material 2 that has been sucked is stored as a stored material 5 (not shown),
Only gas such as air is exhausted to the outside from the exhaust port 14 via the exhaust pipe 8 and the vacuum suction device 6.

After a predetermined period of time has elapsed, a timer device closes the second valve 17.
is closed, and the first valve 16 is opened. Then, communication pipe 1
Suction pressure is supplied to the lower chamber 10 through 5, and negative pressure is applied to the lower chamber 10, creating a pressure difference with the outside air, so the lower chamber hatch 12 is sealed. Since the lower chamber 10 and the upper chamber 9 communicate with each other through the communication pipe 15, there is no pressure difference, and the upper chamber hatch 11 is connected to the accumulated material 5 in the upper chamber 9.
is released due to the weight of the stored material 5, and the stored material 5 moves to the lower chamber 10.

Furthermore, when the first valve 16 is closed and the second valve 17 is opened to achieve the desired state after a predetermined period of time has elapsed, the lower chamber 1
0 communicates with the outside air through the second valve, so the internal pressure becomes the same as atmospheric pressure, but there is still negative pressure in the upper chamber 9, and as a result, a pressure difference occurs again between the upper chamber 9 and the lower chamber 10. This occurs, and the upper hatch 11 is sealed.
On the other hand, the lower chamber hatch 12 is opened by the weight of the stored material 5 in the lower chamber 10, and the stored material 5 is discharged to the outside of the storage tank 4.

Hereinafter, the first valve 16 and the second valve 1 are controlled by the timer device.
By repeatedly opening and closing 7 as described above, the stored material 5 collected in the storage tank 4 can be discharged without interrupting the suction transport operation.

[Effects of the invention] As explained above, according to the invention, it is possible to realize continuous suction processing in vacuum suction transportation,
Processing time can be shortened and processing amount per hour can be increased. Furthermore, since the structure of the storage tank itself is simple, it can be manufactured at low cost, and decontamination work when the tank is contaminated with radioactive substances is also easy.

Furthermore, operation can be simplified, and when working with radioactive materials, the amount of radiation exposure of workers can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a structural diagram of a storage tank according to an embodiment of the present invention, Fig. 2 is a structural diagram of an upper hatch and a lower hatch of the storage tank of Fig. 1, and Fig. 3 is a vacuum suction transportation It is a system diagram of a device. 1... Suction pipe, 2... Recovered material, 3... Suction transport piping, 4... Storage tank, 5... Retained material, 6...
Vacuum suction device, 7... Discharge valve, 8... Exhaust pipe, 9
...Upper chamber, 10...Lower chamber, 11...Upper chamber hatch,
12...Lower chamber hatch, 13...Collection port, 14...
Exhaust port, 15...Communication pipe, 16...First valve, 17
...Second valve, 18...Counterweight, 19
...Hinge.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A first storage chamber provided with an exhaust port and a suction port at the upper part and a stored material transfer mechanism for transferring stored material at the bottom, and a lower part of the first storage chamber. a second storage chamber disposed in the storage chamber and connected to the first storage chamber via the storage transfer mechanism; and a storage discharge mechanism provided at the bottom of the second storage chamber for discharging stored materials. , a communication pipe that communicates the first and second storage chambers, a first valve that is installed in the communication pipe and opens and closes communication between the first and second storage chambers, and the second storage chamber. and a second valve that opens and closes communication with outside air, the storage tank having: a storage tank in which the pressure inside the first storage chamber is lower than the pressure inside the second storage chamber. Sometimes it is sealed, and when it is the same, the above 1st
has a hatch that is opened by the weight of the stored material in the second storage chamber, and the stored material discharge mechanism closes when the pressure inside the second storage chamber is lower than the pressure of the outside air; A storage tank characterized by having a hatch that is opened by the weight of the stored material in the second storage chamber. 2. The storage tank according to claim 1, wherein the first and second storage chambers are an upper chamber and a lower chamber in which one storage tank has an upper and lower two-chamber structure. 3. The storage tank according to claim 1 or 2, wherein the first and second valves are opened and closed by a timer device.