JPH04881Y2 - - 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.

Conventional technology The sand pumping equipment in conventional sewage treatment facilities is
As shown in the figure, a coarse screen 2 is provided upstream of a settling basin 1 for settling sand to remove bulky debris that cannot be sucked up by a jet pump 3. The sand passing through the coarse screen 2 and staying in the settling basin 1 is conveyed to a settling pit 5 by a scraping device 4 such as a screw conveyor, and is pumped up by a jet pump 3. 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.

This invention solves the above-mentioned problems, and aims to reduce the production cost of the sand pumping device as a whole by simplifying the device, and improves the work efficiency of collecting removed garbage. The purpose is to provide equipment.

Means for Solving the Problems In order to solve the above problems, the present invention includes a settling pit formed at the most downstream position of the settling basin, a jet pump disposed in this settling pit, and a jet pump located at the downstream side of the settling basin. In a sand lifting device having a fine screen and a dust remover arranged adjacent to each other, a discharge pipe having one end opened at the bottom of the sand settling pit and the other end located outside the sand settling pit and opening toward the fine screen is provided. It is formed to have an inner diameter that allows bulky waste to flow therethrough, and a pressure water pipe for high-pressure water is opened toward the opening at one end of the discharge pipe.

Function In the above configuration, the normal sand that settles in the sand pit is pumped up by the jet pump.
At this time, since it is impossible for the jet pump to suck up the bulky debris that settles in the sand pit together with the sand, it remains in the sand pit and accumulates. After sand pumping by the jet pump is completed, high pressure water is injected from the pressure water pipe toward the opening at one end of the discharge pipe. The injected high-pressure water is injected into the discharge pipe, and a suction flow generated by the jet draws large debris into the discharge pipe. Then, the sucked bulky debris is conveyed through the discharge pipe by high-pressure water and discharged toward the fine screen through the opening at the other end. Then, the discharged bulky garbage is pulled up by a dust remover and discharged together with other garbage that is removed by the fine screen without settling in the sand settling pit.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. In FIG. 1, a settling basin 12 is formed at the bottom of the sewage treatment channel 11, and a settling pit 14 is located at the most downstream position of the settling basin 12 in the flow direction 13 of the sewage, one step lower than the settling basin 12. It is formed. A screw conveyor 15 is arranged in the sand settling basin 12, a jet pump 16 is arranged in the sand settling pit 14, and a fine screen 1 is arranged adjacent to the downstream side of the sand settling pit 14.
7 and a dust remover 18 are provided. and,
The discharge pipe 19 is a large-diameter pipe having one end opened at the bottom of the sand settling pit 14 and the other end located outside the sand settling pit 14 and opened toward the fine screen 17, and having an inner diameter through which bulky waste can flow. formed and provided. Then, the pressure water pipe 21 that injects the high pressure water 20 opens its opening into the discharge pipe 19.
It is provided toward the opening at one end of the. This pressure water pipe 21 communicates with a high pressure water supply source (not shown) that drives the jet pump 16.

Hereinafter, the effects of the above configuration will be explained. Sediment and bulky garbage that flowed into the sewage treatment channel 11 together with sewage and settled in the settling basin 12 are sent to the settling pit 14 by the screw conveyor 15. The sediment settled in the settling pit 14 is pumped up by the jet pump 16 and discharged to the outside of the sewage treatment channel 11. At this time, bulky debris that cannot be sucked up by the jet pump 16 remains in the settling pit 14 and accumulates therein. After the sand pumping by the jet pump 16 is completed,
High-pressure water 20 is injected from the pressure water pipe 21 toward the opening at one end of the discharge pipe 19, and the injected high-pressure water 20 is injected into the discharge pipe 19, causing a suction flow to remove large debris from the discharge pipe 19. suction inside. Then, the sucked bulky debris is conveyed through the discharge pipe 19 by the high-pressure water 20 and discharged toward the fine screen 17 from the opening at the other end. At this time, since the lift height from the opening at one end of the discharge pipe 19 to the opening at the other end is small, corresponding to the depth of the sand settling pit 14, even if the discharge pipe 19 is a large diameter pipe, the jet pump 16 It is possible to push up bulky debris using high pressure water 20 with the same pressure as the high pressure water that drives the. Then, the bulky garbage discharged from the discharge pipe 19 reaches the fine screen 17 without settling in the settling pit 14, and is pulled up by the dust remover 18 and removed from the sewage treatment channel 11 together with other garbage that is blocked from passing through. is discharged. Therefore, according to this embodiment, the efficiency of the collection work can be improved by pulling up the bulky debris that has settled in the sand settling pit 14 together with other debris that is removed by the fine screen 17 at one location. Furthermore, since it is not necessary to provide a coarse screen and a dust remover on the upstream side of the sand settling basin 12 as in the prior art, the apparatus can be simplified and the manufacturing cost of the sand pumping apparatus as a whole can be reduced.

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 pumping device as a whole, and to improve the efficiency of the work of collecting the removed garbage.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a diagram showing a conventional sand lifting device. 11...Sewage treatment channel, 12...Sand settling basin, 14
...Sand pit, 16...Jet pump, 17
...Fine screen, 18...Dust remover, 19...
Discharge pipe, 20...high pressure water, 21...pressure water pipe.

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, one end is connected to the sand settling pit. A discharge pipe is opened at the bottom and the other end is located outside the sand settling pit and opens towards the fine screen.The discharge pipe is formed to have an inner diameter that allows passage of bulky waste, and high-pressure water is supplied to the opening at one end of the discharge pipe. A sand pumping device characterized by having a pressure water pipe opened and installed.