CN213965315U

CN213965315U - Rotational flow grit chamber

Info

Publication number: CN213965315U
Application number: CN202023020597.6U
Authority: CN
Inventors: 蔡安蓉; 张斌锋; 吴畏; 王孝君; 刘三鹏; 杜君丽; 邱有均
Original assignee: Chongqing Yuxi Water Co ltd Yongchuan Branch
Current assignee: Chongqing Yuxi Water Co ltd Yongchuan Branch
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-08-17
Anticipated expiration: 2030-12-15

Abstract

The utility model discloses a cyclone sand basin, which comprises a basin body, wherein the lower half part of the basin body is a sand hopper part with a conical inner cavity, the upper half part of the basin body is a sand settling area with a diameter larger than the cylindrical inner cavity of the sand hopper part, and a flow inlet and a flow outlet are arranged above the basin body; still including vertical setting up in sand lifting pipe and the air hose under pressure at cell body middle part, its characterized in that, sand hopper bottom surface middle part still is provided with the first holding body of an inversion, and the sealed setting in first holding body upper end leaves the clearance that supplies to advance sand between lower extreme and the sand hopper bottom surface in circumference, and sand lifting pipe lower extreme passes first holding body and extends to and be close to sand hopper bottom surface position, and the air inlet has been seted up on the part that sand lifting pipe is located first holding body, the air hose lower extreme passes first holding body and is located the air inlet top position. The utility model has the advantages of better sand discharging effect of air stripping and better sand sedimentation effect.

Description

Rotational flow grit chamber

Technical Field

The utility model relates to a sand setting system, concretely relates to whirl grit chamber.

Background

The sand setting system is equipment used for separating and extracting sand from sewage in a sewage treatment plant, and is also called a sand setting tank. A rotational flow grit chamber with a circular reinforced concrete structure is arranged in a sand setting facility of the Yongchuan sewage treatment plant. The cyclone grit chamber is structurally characterized by comprising a chamber body, wherein the lower half part of the chamber body is a sand hopper part with a conical inner cavity, the upper half part of the chamber body is a grit zone with a diameter larger than that of the cylindrical inner cavity of the sand hopper part, and a flow inlet and a flow outlet are arranged above the chamber body; the sand extraction device is characterized by further comprising a sand extraction pipeline vertically arranged in the middle of the tank body, the lower end of the sand extraction pipeline extends to the position close to the bottom of the sand hopper part, the upper end of the sand extraction pipeline is connected with the sand-water separator, a pressure air pipeline is sleeved outside the sand extraction pipeline to form a double-layer structure, the lower end of the pressure air pipeline is hermetically connected with the lower end of the sand extraction pipeline, a circle of air holes are distributed in the inner wall of the sand extraction pipeline above the sealed connection part to enable the sand extraction pipeline to be communicated with the pressure air pipeline to form an air distribution structure, the upper end of the pressure air pipeline is connected with a sand extraction air source, and the sand extraction air source adopts a roots blower; and a vertical stirring device is also arranged in the tank body.

When the existing rotational flow grit chamber works, a vertical stirring device is firstly adopted for stirring to form rotational flow, the flow state of water is changed, inorganic sand grains in sewage are thrown to the chamber wall under the action of centrifugal force, and are synchronously separated from organic matters and then rapidly precipitated. The sand grains accumulated around the pool wall and getting thicker and thicker are converged into the central sand hopper under the action of centripetal force and gravity, and then the compressed air provided by the Roots blower is utilized to lift the sand in the sand hopper and a small amount of sewage into the sand-water separator together from the sand lifting pipeline for separation, so that the purposes of removing inorganic sand grains with the specific gravity of more than 2.65t/m3 and the grain size of more than 0.2mm in the sewage are achieved.

The spiral-flow type sand setting system has the defects that the cost of the stirring device is higher, the spiral-flow sand setting effect is poor by providing power through stirring, the sand extracting efficiency is poor, and the like.

In order to solve the above-mentioned defects, the applicant has designed a new structure of cyclone sand basin and applied for a patent, CN102430271B discloses a tilted plate type cyclone sand settling system. The system comprises a tank body, wherein the lower half part of the tank body is a sand hopper part, the upper half part of the tank body is a sand settling area, and a flow inlet and a flow outlet are arranged above the tank body; the sand-extracting and gas-distributing structure is characterized in that an inclined plate sedimentation structure is arranged on the bottom surface of the sand settling area part; the tank body is also provided with an inner wall jet structure; the lower end of the sand extracting pipeline is provided with a sand extracting pipe inlet structure; the sand lifting and gas distributing structure comprises a pressure air pipeline which is vertically arranged in parallel with the sand lifting pipeline, the lower port of the pressure air pipeline is transversely communicated to the middle of the horn body, and the position of the lower port of the pressure air pipeline is higher than the position of the inlet at the lower end of the sand lifting pipeline. The system has the advantages of low implementation and maintenance cost, good system operation continuity and convenient maintenance and repair.

However, in the grit chamber with the structure of the patent, after the applicant runs and uses for a period of time, the following defects are found again: 1 the grit zone of the upper half part of the tank body is provided with 8 sloping plates, and the sedimentation effect is strengthened by the collision of sand grains and the sloping plates under the water inlet rotational flow state, so that the sedimentation is feasible theoretically from the sloping plates. However, in actual operation, part of the inclined plates far away from the water inlet direction cannot play a role, and meanwhile, the inclined plates are vertically arranged, so that the damping coefficient is increased, the water cyclone effect is influenced, and on the other hand, the turbulence effect of a transition region between the inclined plates is enhanced, the water inlet cyclone effect is also damaged, and the sand sedimentation effect is reduced. 2 the improved gas stripping device still belongs to the principle of continuous gas stripping device, and utilizes the density difference produced by gas-liquid-solid three-phase flow and liquid-solid two-phase flow to make the low-density liquid level in the lifting pipe be pressed and lifted by high-density liquid level outside the lifting pipe. However, in actual operation, the density of the gas-liquid-solid three-phase flow is generally only 50% of that of the liquid-solid two-phase flow, so that the sand content in the fluid in the pool body is low, and the efficiency of the continuous gas stripping device for improving the flow rate in actual operation is not high.

Therefore, how to improve the defects, improve the sedimentation effect of the water inlet sand grains and improve the sand discharge effect of the air stripping device becomes a problem to be further considered and solved by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

To the not enough of above-mentioned prior art, the utility model aims to solve the technical problem that: how to provide a rotational flow grit chamber capable of improving air stripping sand discharging effect and further improving inflow sand sedimentation effect.

In order to solve the technical problem, the utility model discloses a following technical scheme:

a rotational flow grit chamber comprises a chamber body, the lower half part of the chamber body is a sand hopper part with a conical inner cavity, the upper half part of the chamber body is a grit zone with a diameter larger than the cylindrical inner cavity of the sand hopper part, and a flow inlet and a flow outlet are arranged above the chamber body; still including vertical setting up in sand lifting pipe and the air hose under pressure at cell body middle part, its characterized in that, sand hopper bottom surface middle part still is provided with the first holding body of an inversion, and the sealed setting in first holding body upper end leaves the clearance that supplies to advance sand between lower extreme and the sand hopper bottom surface in circumference, and sand lifting pipe lower extreme passes first holding body and extends to and be close to sand hopper bottom surface position, and the air inlet has been seted up on the part that sand lifting pipe is located first holding body, the air hose lower extreme passes first holding body and is located the air inlet top position.

Like this, during the use, let in pressure air through pressure air pipe in toward first holding body inner chamber and form the air chamber, lean on pressure air constantly to compress the liquid level in the first holding downwards, pressure air forms the bubble and upward movement in entering into the sand lifting pipe from the inlet port position when reaching the inlet port position, drives the sand lifting pipe lower extreme and inhales sand. When partial air enters the sand lifting pipe through the air inlet hole, the air pressure in the air chamber is reduced, the liquid level rises to seal the air inlet hole until the air in the air chamber is continuously lifted to the liquid level and then is reduced below the air inlet hole, and the pressure air enters the sand lifting pipe again. By the circulation, continuous bubbles enter the sand lifting pipe, and discontinuous continuous sand lifting is realized. Because the highly compressed gas in the sand lifting pipe enters the air inlet and then moves upwards to drive the lower end of the sand lifting pipe to suck sand grains to realize sand lifting, the amount of sucked sand grains can be increased. Greatly improving the sand extracting and discharging effect.

Preferably, the first accommodating body is in a frustum shape with a large diameter end at the upper part and a small diameter end at the lower part. Therefore, the negative speed gradient difference can be utilized to accelerate the water drainage speed during air stripping, reduce the rising speed of the liquid level and reduce the disturbance effect of rising flow.

Preferably, the two pressure air pipes are symmetrically arranged.

Therefore, the air pressure provided for the air chamber is more balanced, the disturbance caused by air pressure fluctuation is reduced, and the sedimentation extraction of sand grains is facilitated.

Preferably, a second accommodating body with an upward opening is fixedly arranged on the sand lifting pipe in the first accommodating body, the pressure air pipe is positioned above the second accommodating body, and the air inlet is positioned in the second accommodating body.

Like this, behind the pressurized air entering first holding body inner chamber, need to impress the liquid that is located the inlet port top of carrying the sand pipe in the second holding body back in carrying the sand pipe again, could get into the bubble, the liquid of the inlet port of impressing earlier upwards flows in carrying the sand pipe, produces certain sand lifting effect, for the bubble gets into the back and drives the quick upwards flow of carrying the sand pipe in the fluid and produce a buffering, avoids carrying the sand process too big to rivers disturbance suddenly, improves the stationarity of carrying the sand. Meanwhile, after pressure air enters the sand lifting pipe through the air inlet, the air pressure in the first accommodating body is reduced, and liquid can enter the second accommodating body through the upper port of the second accommodating body and submerge the air inlet after the liquid level outside the second accommodating body is required to be lifted to the height of the upper port of the second accommodating body; the time that the compressed air enters the sand extracting pipe through the air inlet is prolonged, and the problem that the sand extracting effect is poor due to the fact that air bubbles entering the air inlet are too small is avoided.

Preferably, the second container is in a frustum shape with a large diameter end at the upper part and a small diameter end at the lower part. This reduces the rate of rise of the liquid level, extends the time for the gas to enter the inlet and reduces the turbulence effect of the rising flow.

Preferably, the first accommodating body, the second accommodating body and the sand extracting pipe are arranged coaxially.

Therefore, the whole sand lifting stress is more balanced and stable, and the water flow disturbance is small.

Preferably, a plurality of curved plates are arranged on the bottom surface of the sand setting area part along the circumferential direction, the curved plates are bent from the inner side to the inner lower side, and the whole curved plates are bent along the water inlet swirling flow direction.

The curved plate reduces the damping coefficient of the water inflow rotational flow, reduces the disturbance effect on the rotational flow, can generate the inclined plate effect and the water drop effect above the curved plate, and utilizes the reduction of gravity and pressure gradient to guide and realize the natural sedimentation of sand grains.

Furthermore, the curved plate is integrally in a triangle shape with an upward tip, one side of the curved plate along the water flow direction is a longer side, the other side of the curved plate is a shorter side, and the longer side and the shorter side are both in arc structures.

Therefore, the disturbance effect of the upper end of the curved plate on water flow can be reduced to the maximum extent, the water inflow rotational flow is better guided, and sand sedimentation is realized. In practice, the curved plate can be obtained by cutting out (usually one eighth) the curved surface of the blade surface of the spiral turbine fan, so that the water can be better guided to realize the rotational flow.

Furthermore, the curved plate is 4 that set up along circumference equipartition. Too much causes great disturbance to the water flow, and too little causes insufficient sand sedimentation effect.

Furthermore, the inflow port and the outflow port above the tank body are tangentially arranged on the side wall of the sand settling zone. Therefore, the water flow can be better guided to enter the tank body to realize rotational flow.

Further, the cell body still is provided with inner wall efflux structure, inner wall efflux structure includes inner wall efflux pipeline, the delivery port direction of inner wall efflux pipeline is for setting up along grit zone inner wall circumference tangential direction, the end of intaking of inner wall efflux pipeline passes through the reclaimed water pipeline and links to each other with the reclaimed water system.

Like this, the inner wall efflux structure kicks into the cell body with the normal water from sand setting district inner wall circumference tangential direction in, and then forms the whirl better.

Furthermore, an emptying system is arranged at the bottom of the sand hopper and comprises an emptying pipeline, one end of the emptying pipeline is connected with the bottom of the sand hopper, a switch valve is arranged in the emptying pipeline, a back washing pipeline is connected between the switch valve on the emptying pipeline and the bottom of the sand hopper, and a switch valve is arranged on the back washing pipeline and connected with the reclaimed water pipeline.

Like this, when carrying sand pipeline or forced air pipeline and need overhaul, can open the atmospheric system and empty the rivers and the unloading of silt in with the pond, then overhaul, make to overhaul the operation more convenient. In addition, when the emptying pipeline is blocked, a backflushing pipeline can be adopted for backflushing, so that the normal work of the emptying system is ensured.

To sum up, the utility model has the advantages of the sand effect is better to the air stripping row, and the sand sedimentation effect is better.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic perspective view of a portion of the single sand trap of fig. 1.

FIG. 3 is an enlarged view of the lower end portion of the sand pipe of FIG. 1.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

In the specific implementation: referring to fig. 1-3, a rotational flow grit chamber comprises a chamber body, the lower half part of the chamber body is a sand hopper 1 part with a conical inner cavity, the upper half part of the chamber body is a grit zone 2 with a diameter larger than that of the cylindrical inner cavity of the sand hopper part, and an inflow port 3 and an outflow port 4 are arranged above the chamber body; still including vertical setting up in sand lifting pipe 5 and the air-under-pressure pipe 6 at cell body middle part, wherein, sand hopper bottom surface middle part still is provided with a first holding body 7 of invering, and the sealed setting of 7 upper ends of first holding body and lower extreme and sand hopper bottom surface leave the clearance that supplies into sand between the circumference, and sand lifting pipe 5 lower extreme passes first holding body 7 and extends to being close to sand hopper bottom surface position, and sand lifting pipe 5 has seted up inlet port 8 on the part that is located first holding body 7, air-under-pressure pipe 6 lower extreme passes first holding body and is located inlet port 8 top positions.

The first container 7 is in the shape of a frustum with a large diameter end at the top and a small diameter end at the bottom. Therefore, the negative speed gradient difference can be utilized to accelerate the water drainage speed during air stripping, reduce the rising speed of the liquid level and reduce the disturbance effect of rising flow.

Wherein, the pressure air pipes 6 are two symmetrically arranged.

Wherein, still fixedly being provided with a second container 9 that the opening is ascending on the sand lifting pipe in first container 7, pressure air pipe 6 is located second container 9 top, the inlet port is located the second container.

The second container 9 is in the shape of a frustum with a large diameter end at the top and a small diameter end at the bottom. This reduces the rate of rise of the liquid level, extends the time for the gas to enter the inlet and reduces the turbulence effect of the rising flow.

Wherein the first containing body 7, the second containing body 9 and the sand extracting pipe 5 are arranged coaxially.

Wherein, be provided with polylith curved plate 10 along circumference on the bottom surface of grit zone part, the curved plate is inside downwards bending, and whole is crooked along the water inlet whirl direction simultaneously.

The curved plate 10 is a triangle with an upward tip, and has a longer side and a shorter side along the water flow direction, and the longer side and the shorter side are both arc-shaped structures.

Wherein, curved plate 10 is 4 that the circumference equipartition set up. Too much causes great disturbance to the water flow, and too little causes insufficient sand sedimentation effect.

Wherein, the inflow port and the outflow port above the tank body are tangentially arranged on the side wall of the sand settling zone. Therefore, the water flow can be better guided to enter the tank body to realize rotational flow.

Wherein, the cell body still is provided with inner wall fluidic structure, inner wall fluidic structure includes inner wall jet line 11, the delivery port direction of inner wall jet line 11 is for setting up along grit zone inner wall circumference tangential direction, the end of intaking of inner wall jet line 11 passes through well water pipeline 12 and links to each other with the well water system.

The sand bucket is characterized in that an emptying system is arranged at the bottom of the sand bucket and comprises an emptying pipeline 13, one end of the emptying pipeline 13 is connected with the bottom of the sand bucket, a switch valve is arranged in the emptying pipeline, a back washing pipeline 14 is connected between the switch valve on the emptying pipeline and the bottom of the sand bucket, and a switch valve is arranged on the back washing pipeline 14 and is connected with the reclaimed water pipeline 12.

Claims

1. A rotational flow grit chamber comprises a chamber body, the lower half part of the chamber body is a sand hopper part with a conical inner cavity, the upper half part of the chamber body is a grit zone with a diameter larger than the cylindrical inner cavity of the sand hopper part, and a flow inlet and a flow outlet are arranged above the chamber body; still including vertical setting up in sand lifting pipe and the air hose under pressure at cell body middle part, its characterized in that, sand hopper bottom surface middle part still is provided with the first holding body of an inversion, and the sealed setting in first holding body upper end leaves the clearance that supplies to advance sand between lower extreme and the sand hopper bottom surface in circumference, and sand lifting pipe lower extreme passes first holding body and extends to and be close to sand hopper bottom surface position, and the air inlet has been seted up on the part that sand lifting pipe is located first holding body, the air hose lower extreme passes first holding body and is located the air inlet top position.

2. The cyclone grit chamber of claim 1 wherein said first container is frustoconical with a larger diameter end at the top and a smaller diameter end at the bottom.

3. The cyclone grit chamber of claim 1 wherein said pressure air pipe is two symmetrically disposed.

4. The rotational flow grit chamber as claimed in claim 1 wherein a second container body with an upward opening is further fixedly arranged on the sand lifting pipe in the first container body, the pressure air pipe is positioned above the second container body, and the air inlet hole is positioned in the second container body.

5. The cyclone grit chamber of claim 4 wherein said second container is frustoconical with a larger diameter end at the top and a smaller diameter end at the bottom.

6. The cyclone grit chamber of claim 5 wherein said first container, said second container and said sand extraction tube are coaxially disposed.

7. A rotational flow grit chamber as in claim 5 wherein said grit zone portion has a plurality of curved plates circumferentially disposed on the bottom surface thereof, said curved plates being curved inwardly and downwardly and being curved in the direction of the rotational flow of the influent water as a whole.

8. A rotational flow grit chamber as in claim 7 wherein the curved plate is generally in the form of an upwardly pointing triangle having a longer side and a shorter side along the direction of flow, the longer and shorter sides each being in the form of an arc.

9. A rotational flow grit chamber as in claim 8 wherein the curved plate is 4 pieces evenly distributed along the circumference.

10. A cyclonic grit chamber as claimed in claim 9 wherein the inflow and outflow ports above the chamber body are tangentially located in the side walls of the grit zone;

the pool body is also provided with an inner wall jet flow structure, the inner wall jet flow structure comprises an inner wall jet flow pipeline, the water outlet direction of the inner wall jet flow pipeline is arranged along the circumferential tangential direction of the inner wall of the sand setting area, and the water inlet end of the inner wall jet flow pipeline is connected with a reclaimed water system through a reclaimed water pipeline;

the sand hopper is characterized in that an emptying system is arranged at the bottom of the sand hopper and comprises an emptying pipeline, one end of the emptying pipeline is connected with the bottom of the sand hopper, a switch valve is arranged in the emptying pipeline, a back washing pipeline is connected between the switch valve on the emptying pipeline and the bottom of the sand hopper, and a switch valve is arranged on the back washing pipeline and connected with a reclaimed water pipeline.