CN215427482U

CN215427482U - High efficiency whirl grit chamber cell body structure

Info

Publication number: CN215427482U
Application number: CN202121778709.6U
Authority: CN
Inventors: 张长虹; 蔡安蓉; 吴畏; 刘三鹏; 李小军; 黄科艾
Original assignee: Chongqing Yuxi Water Co ltd Yongchuan Branch
Current assignee: Chongqing Yuxi Water Co ltd Yongchuan Branch
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-01-07
Anticipated expiration: 2031-08-02

Abstract

The utility model discloses a cell body structure of a high-efficiency rotational flow grit chamber, wherein the lower half part of the cell body is provided with a sand hopper with an inverted conical frustum-shaped inner cavity, the upper half part of the cell 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 cell body; the sand hopper is characterized in that an inclined settling plate is further arranged at the bottom of the sand hopper, the inclined direction of the inclined settling plate is consistent with the inclined direction of the side wall of the sand hopper, and a gap is reserved between the lower end of the inclined settling plate and the bottom surface of the sand hopper. The utility model has the advantages of better improving the sand setting efficiency and better avoiding disturbing the sediment at the bottom of the tank body in the air stripping process.

Description

High efficiency whirl grit chamber cell body structure

Technical Field

The utility model relates to a rotational flow grit chamber, in particular to a chamber body structure of a rotational flow 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.

In order to better improve the above-mentioned drawbacks, the applicant filed a cyclone grit chamber of patent application No. 2020230205976 again. In the grit chamber, the mode that the pulse type air stripping device is arranged at the sand hopper part is adopted, sand discharge can be realized in the mode of pulse type air stripping, and the sand discharge efficiency is improved. However, in the pulse air stripping mode, the air pressure of the air pipe needs to press the air in the air chamber into the sand stripping pipe, and the required air pressure is large. When the air pressure of the supplied air is small, the operation cannot be effectively carried out, and meanwhile, the mode is inconvenient to use under the condition that the sand discharge amount is small. In addition, in the grit chamber, the bottom sand hopper part also has the defects of low sediment settling efficiency and easy disturbance of rising of sediment at the bottom during air stripping.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the technical problems to be solved by the utility model are as follows: how to provide one kind can improve sand setting efficiency better, can avoid the air stripping process disturbance cell body bottom silt's high efficiency whirl grit chamber cell body structure better.

In order to solve the technical problems, the utility model adopts the following technical scheme:

a high-efficiency rotational flow grit chamber body structure comprises a sand hopper with an inverted conical frustum-shaped inner cavity at the lower half part of the body, a grit zone with a diameter larger than that of the cylindrical inner cavity of the sand hopper part at the upper half part of the body, and an inflow port and an outflow port above the body; the sand hopper is characterized in that an inclined settling plate is further arranged at the bottom of the sand hopper, the inclined direction of the inclined settling plate is consistent with the inclined direction of the side wall of the sand hopper, and a gap is reserved between the lower end of the inclined settling plate and the bottom surface of the sand hopper.

Like this, the setting of slant sedimentation plate can utilize the inclined plate to deposit the silt settling effect that the principle improved the sand hopper bottom, and on the other hand also reduces the reynolds number that compressed gas arouses the torrent during air stripping simultaneously, creates good hydraulic conditions, avoids the vortex that arouses in the air stripping device course to drive silt and pops up.

Further, the slant sedimentation plates are arranged at intervals along the height direction and are arranged in groups, the upper end of each group of slant sedimentation plates is positioned on the same horizontal plane and fixed on a transverse fixing rod, and the fixing rods are fixed relative to the tank body.

Thus, the sedimentation efficiency of the inclined sedimentation plate can be better improved.

Further, the inclined settling plates are symmetrically arranged in two groups from left to right.

In this way, the settling of the inclined settling plate can be better facilitated.

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.

In conclusion, the utility model has the advantages of better improving the sand settling efficiency and better avoiding disturbance of the sediment at the bottom of the tank body in the air stripping process.

Drawings

Fig. 1 is a schematic structural view of a high-efficiency cyclone grit chamber employing the structure 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 a specific embodiment of a high-efficiency cyclone grit chamber using the structure of the present invention.

In the specific implementation: referring to fig. 1-3, a high efficiency cyclone grit chamber comprises a chamber body, the lower half part of the chamber body is a sand hopper 1 with an inverted cone frustum shaped inner cavity, the upper half part of the chamber body is a grit zone 2 with a diameter larger than 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 in the sand extraction pipe 5 and the air-under-pressure pipe 6 at cell body middle part, wherein, sand extraction pipe 5 and the air-under-pressure pipe 6 lower part are located sand hopper 1 and are provided with the economic benefits and social benefits and carry the sand device, the economic benefits and social benefits is carried the sand device and can be realized the switching control of pulsed air stripping and continuous type air stripping.

Like this, rely on the economic benefits and social benefits to carry sand device can realize the switching control of pulsed air stripping and continuous type air stripping, when the sand setting volume is great in the grit chamber, can control to open pulsed air stripping mode, improve and carry sand efficiency, when the sand setting volume is less in the grit chamber, can control to open continuous type air stripping mode, reduce energy loss. Therefore, the sand extraction mode can be enriched, and the sand extraction device can better adapt to various sand setting quantities.

Furthermore, the double-effect sand extracting device comprises an inverted first accommodating body 7 arranged in the middle of the bottom surface of the sand hopper, the upper end of the first accommodating body 7 is sealed, a gap for sand feeding is reserved between the lower end of the first accommodating body and the bottom surface of the sand hopper in the circumferential direction, the lower end of a sand extracting pipe 5 penetrates through the first accommodating body 7 and extends to a position close to the bottom surface of the sand hopper, an air inlet hole 8 is formed in the part, located in the first accommodating body 7, of the sand extracting pipe 5, and the lower end of a pressure air pipe 6 penetrates through the first accommodating body and is located above the air inlet hole 8; the double-effect sand extracting device further comprises a three-way control valve 15 arranged on the pressure air pipe 6 located at the position adjacent to the upper portion of the first accommodating body 7, the three-way control valve 15 is provided with an air inlet end connected with the upper portion of the pressure air pipe upwards, a first air outlet end connected with the lower end portion of the pressure air pipe downwards, a second air outlet end connected with an inclined pipe 16 arranged obliquely upwards, and the upper end portion of the inclined pipe 16 is communicated and fixed on the sand extracting pipe 5.

Like this, during the use, when sediment sand volume is big in the sand fill bottom, let in pressure air through the tee bend control valve control on the pressure air pipe toward first holding internal chamber and form the air chamber, lean on the liquid level in the first holding of pressure air continuous compression downwards, pressure air forms the bubble and upward movement in entering into the sand lifting pipe from the inlet port position when arriving the inlet port position, drives the sand lifting pipe lower extreme and inhales the 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. The pulse type air stripping mode can greatly improve sand extracting and discharging effects. When the sediment amount of the bottom of the sand hopper is small, the air of the pressure air pipe can be controlled by the three-way control valve to be directly upwards connected into the sand lifting pipe through the inclined pipe and upwards flow along the sand lifting pipe, so that the lower end of the sand lifting pipe is driven to suck and discharge silt, and a continuous air lifting mode is realized. Therefore, the sand lifting device can conveniently and quickly control the switching of two sand lifting modes according to the requirement, and has the advantages of simple structure, and convenient, reliable and quick control.

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.

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.

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.

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.

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.

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

The bottom of the sand hopper 1 is also provided with an inclined precipitation plate 17, the inclined direction of the inclined precipitation plate 17 is consistent with the inclined direction of the side wall of the sand hopper, and a gap is reserved between the lower end of the inclined precipitation plate 17 and the bottom surface of the sand hopper.

Wherein, slant sedimentation plate 17 is arranged along direction of height interval and is set up in groups, and every group slant sedimentation plate upper end is located same horizontal plane and fixes on horizontal dead lever 18, and dead lever 18 is fixed for the cell body.

Wherein, the inclined settling plates 17 are arranged in two groups in bilateral symmetry.

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 high-efficiency rotational flow grit chamber body structure comprises a sand hopper with an inverted conical frustum-shaped inner cavity at the lower half part of the body, a grit zone with a diameter larger than that of the cylindrical inner cavity of the sand hopper part at the upper half part of the body, and an inflow port and an outflow port above the body; the sand hopper is characterized in that an inclined settling plate is further arranged at the bottom of the sand hopper, the inclined direction of the inclined settling plate is consistent with the inclined direction of the side wall of the sand hopper, and a gap is reserved between the lower end of the inclined settling plate and the bottom surface of the sand hopper.

2. The structure of a high efficiency rotational flow sand basin body as claimed in claim 1, wherein the inclined settling plates are arranged in groups at intervals along the height direction, the upper end of each group of inclined settling plates is positioned at the same horizontal plane and fixed on a transverse fixing rod, and the fixing rod is fixed relative to the body.

3. The structure of a high efficiency cyclone sand basin body as claimed in claim 2, wherein the inclined settling plates are symmetrically arranged in two groups from left to right.

4. The structure of a high efficiency rotational flow grit chamber as in claim 1, wherein a plurality of curved plates are circumferentially arranged on the bottom surface of said grit region portion, and the curved plates are curved inward and downward and are curved integrally in the direction of the rotational flow of the influent water.

5. The structure of a high efficiency rotational flow sand basin body as claimed in claim 4, wherein the curved plate is a triangle-like shape with an upward tip as a whole, and has a longer side and a shorter side along the water flow direction, and the longer side and the shorter side are arc-shaped structures respectively.

6. The structure of claim 5, wherein the curved plates are 4 pieces evenly distributed along the circumferential direction.

7. A cell body structure of a high efficiency rotational flow grit chamber as in claim 5 wherein the inflow and outflow ports above the cell body are tangentially disposed in the sidewall of the grit zone.

8. The structure of the high-efficiency rotational flow grit chamber as claimed in claim 5, wherein the chamber body is further provided with an inner wall jet structure, said inner wall jet structure comprises an inner wall jet pipeline, the water outlet direction of said inner wall jet pipeline is arranged along the circumferential tangential direction of the inner wall of the grit zone, and the water inlet end of said inner wall jet pipeline is connected with the reclaimed water system through a reclaimed water pipeline.

9. The basin body structure of the high efficiency rotational flow grit chamber of claim 8, wherein the bottom of the sand hopper is provided with an emptying system, the emptying system comprises an emptying pipe, one end of the emptying pipe is connected with the bottom of the sand hopper, a switch valve is arranged in the emptying pipe, a back washing pipe is arranged between the switch valve on the emptying pipe and the bottom of the sand hopper, and a switch valve is arranged on the back washing pipe and connected with the reclaimed water pipe.