JPH04883Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a sand pumping device in a sewage treatment facility.

BACKGROUND TECHNOLOGY As shown in Fig. 3, a conventional sand pumping device for a sewage treatment facility is equipped with a coarse screen 2 on the upstream side of a settling basin 1 in which settled sand is retained to remove bulky debris that would clog a jet pump 3. Ta. Then, the sediment passing through the coarse screen 2 and staying in the settling basin 1 is collected by a scraping device 4 such as a screw conveyor.
The sand was transported to a sand settling pit 5, and the jet pump 3 was used to lift the sand. In addition, garbage that did not settle in the sand settling basin 1 was removed by a fine screen 6.

Problems to be Solved by the Invention However, according to the above-mentioned conventional configuration, it is necessary to provide a dust removal device for the coarse screen 2 and the fine screen 6 to pull up the dust removed by each screen, In addition to increasing the production cost of the entire device, the removed trash must be collected at multiple locations.
This was considered a problem when trying to improve the efficiency of collection work.

The present invention solves the above-mentioned problems by simplifying the device and reducing the production cost of the sand pumping device as a whole, as well as improving the work efficiency of collecting removed garbage. The purpose is to provide

Means for Solving the Problems In order to solve the above problems, the present invention includes a settling pit formed in a settling basin, a jet pump placed in the settling pit, and a jet pump placed adjacent to the downstream side of the settling basin. In a sand pumping device having a fine screen and a dust remover, a coarse screen capable of removing bulky debris that can block the jet pump is placed over the opening of the sand settling pit, and the downstream end is adjacent to the fine screen. A high-pressure water injection nozzle is installed at the upstream end of the coarse screen to spray high-pressure water along the surface of the coarse screen toward the fine screen. The structure includes an ultra-large dust screen with a coarser mesh.

Function In the above configuration, normal sediment and bulky garbage that settles in the sedimentation basin pass through the extra-large garbage screen. When the bulky debris that clogs the jet pump flows into the sand settling pit, it is blocked by the coarse screen and accumulates on the coarse screen, while the settled sand passes through the coarse screen and settles in the sand settling pit. and stay there. The sand accumulated in the settling pit is pumped up by a jet pump, and the bulky waste accumulated on the coarse screen is removed from the top of the coarse screen to the downstream side of the fine screen by high pressure water jetted from the high pressure water injection nozzle. The fine screen dust remover pulls it up and discharges it together with other waste removed by the fine screen. When some of the bulky garbage accumulates on the coarse screen, and the ultra-large garbage that cannot be pushed out to the fine screen with high-pressure water settles in the settling basin, the ultra-coarse garbage screen Since the passage of such dirt is blocked, ultra-large dirt does not accumulate on the coarse screen. Furthermore, since these super-large debris are rare and do not need to be pulled up frequently, there is no need to permanently install means for pulling them up as part of the sand lifting device.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. In Figures 1 and 2, sewage treatment channel 1
A settling basin 12 is formed at the bottom of the basin 1 for settling and retaining sand. A settling basin 1 is located at the most downstream position of the settling basin 12 in the direction 13 of the flow of sewage.
A sand settling pit 14 is formed which is one step lower than 2. Further, a fine screen 15 is provided adjacent to the downstream side of the sand settling basin 12, that is, adjacent to the sand settling pit 14.
A dust remover 16 is provided for pulling up the dust removed by the fine screen 15.
A coarse screen 18 is provided at the opening 17 of the sand settling pit 14 so as to cover the opening 17 and have its downstream end adjacent to the fine screen 15. In the middle of this coarse screen 18, an insertion hole 20 is formed for inserting an air-mixing jet pump 19, which is arranged vertically in the sand settling pit 14 and lifts sand with high pressure water. Cover 2 surrounding 20
1 is provided. And coarse screen 1
8 is formed so as to allow sediment to settle into the settling pit 14 and to prevent passage of bulky debris that would clog the jet pump 19. Furthermore, a plurality of high-pressure water injection nozzles 23 are provided at the upstream end of the coarse screen 18 and on the downstream side of the cover 12 for jetting high-pressure water 22 along the surface of the coarse screen 18 and toward the fine screen 15. It is provided. The high-pressure water injection nozzle 23 also communicates with a supply source (not shown) that supplies high-pressure water to the jet pump 19. A plurality of air injection nozzles 25 are installed at appropriate locations on the coarse screen 18 to blow air 24 upward.
is provided. The air injection nozzle 25 also communicates with a source (not shown) that supplies air to the jet pump 19. That is, the high-pressure water 22 supplied to the high-pressure water injection nozzle 23 and the air 24 supplied to the air injection nozzle 25 are supplied using equipment provided for driving the jet pump 19. In the sand settling basin 12, on the upstream side of the sand settling pit 14, a very coarse dust screen 26 is provided. This super coarse garbage screen 26
The screen 18 is made coarser than the coarse screen 18 so as to be able to remove extremely large debris such as bicycles and wood from among the bulky debris that clogs the jet pump 19. A bucket crane 27 is disposed upstream of this ultra-large dust screen 26.

Hereinafter, the effects of the above configuration will be explained. First, the normal sediment and bulky garbage that settles in the sedimentation basin 12 pass through the extra-large garbage screen 26. The bulky debris that clogs the jet pump 19 is blocked by the coarse screen 18 when it flows into the sand settling pit 14 and accumulates on the coarse screen 18, while the sediment passes through the coarse screen 18. Then, it settles in the settling pit 14 and stays there. The sand remaining in the sand settling pit 14 is pumped up by a jet pump 19. When the bulky debris accumulated on the coarse screen 18 reaches a predetermined amount, the high-pressure water jet nozzle 23
By jetting higher pressure water 22 and jetting air 24 from the air jet nozzle 25,
The bulky garbage is pushed out from above the coarse screen 18 to the fine screen 15 downstream by the high pressure water 22 while applying a lifting force to the bulky garbage by the air 24 jetted out. Then, the dust remover of the fine screen 15 pulls it out of the sewage treatment waterway 11 together with the other removed substances removed by the fine screen 15, that is, the bulky garbage that has reached the fine screen 15 without settling in the settling pit 14. be discharged. and,
When the bulky waste accumulates on the coarse screen 18, it is removed by the high pressure water 22 to the fine screen 15.
When ultra-large garbage that cannot be pushed out to the side settles in the settling basin, the ultra-large garbage screen 26 prevents its passage, so the ultra-large garbage accumulates on the coarse screen 18. Never.
Furthermore, since these super-large debris are rare and do not need to be pulled up frequently, there is no need to permanently install a dust removal device as part of the sand lifting device. Therefore, it is only necessary to arrange the bucket crane 27 at the appropriate time to carry out the lifting. Therefore, according to this embodiment, the jet pump 19
The coarse screen 18 removes the bulky garbage that blocks the pores, and the coarse garbage removed by the coarse screen 18 can be pulled up together with other bulky garbage removed by the fine screen 15, and cannot be pushed out with the high-pressure water 22. The ultra-large garbage screen 26 can remove large amounts of super-large garbage, and there is no need to permanently install a dust removal device on the ultra-large garbage screen 26, so the device can be simplified and the manufacturing cost of the entire sand lifting device can be reduced. This can be reduced. Also,
The work efficiency of collection work can be improved because the sand lifting device can pull up bulky trash in one place.

Effects of the Invention As described above, according to the present invention, it is possible to simplify the device and reduce the manufacturing cost of the sand lifting device as a whole, as well as to improve the work efficiency of collecting the removed bulky garbage.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a view taken along the line a-a in FIG. 1, and FIG. 3 is a diagram showing a conventional sand lifting device. 11...Sewage treatment tank, 12...Sand settling basin, 14...
...Sand pit, 15...Fine screen, 16...
... Dust remover, 18 ... Coarse screen, 19 ... Jet pump, 20 ... Insertion hole, 22 ... High pressure water, 23 ... High pressure water injection nozzle, 24 ... Air,
25...Air injection nozzle, 26...Super coarse dust screen.

Claims (1)

[Scope of utility model registration request] In a sand pumping device having a sand settling pit formed in a sand settling basin, a jet pump disposed in the sand settling pit, and a fine screen and a dust remover disposed adjacent to the downstream side of the sand settling basin, there is a coarse sand pump that blocks the jet pump. A coarse screen capable of removing dust is provided to cover the opening of the grit pit and its downstream end is adjacent to the fine screen. A high-pressure water injection nozzle is provided to eject high-pressure water toward a fine screen, and an ultra-large garbage screen with a coarser mesh than the coarse screen is provided on the upstream side of the settling pit in the settling basin. sand equipment.