Rotational flow grit chamber

Abstract

The utility model discloses a rotational flow grit chamber which comprises an annular chamber body, a sand hopper is downwards arranged in the middle of the bottom of the chamber body, a vortex stirring device is further arranged in the middle of the chamber body, an inflow port is formed in one side of the lower portion of the chamber body, and an outflow port is formed in one side of the upper portion of the chamber body. The guide baffle is vertically arranged, and the horizontal section of the guide baffle is in an arc shape coaxial with the tank body. The utility model has the advantages of higher sedimentation efficiency, good desilting smoothness, lower structure cost and maintenance cost and the like.

Description

Technical Field

[0001] This utility model relates to the field of sewage treatment equipment systems, specifically to a vortex grit chamber. Background Technology

[0002] A vortex grit chamber is a grit settling device that uses mechanical force to control the flow pattern and velocity of water, accelerates the sedimentation of sand particles, and carries away organic matter with the water flow.

[0003] As a primary treatment unit in wastewater treatment plants, grit chambers primarily remove heavier solid particles such as sand from wastewater. A traditional grit chamber structure consists of an inlet, an outlet, a ring-shaped sedimentation zone, a sand hopper in the center of the sedimentation zone, a vortex mixer, and a sand discharge pipe. Wastewater enters through the inlet and is agitated by the vortex mixer, creating a swirling flow that promotes the separation of organic matter and sand. Due to the difference in centrifugal force, the denser sand particles are thrown against the chamber wall and settle into the sand hopper under gravity; while the lighter organic matter separates from the sand in the central part of the grit chamber and is carried out of the chamber by the swirling flow of the effluent, achieving initial sand-water separation.

[0004] Traditional grit chamber structures suffer from drawbacks such as low settling efficiency, susceptibility to sand clogging, and high maintenance costs. Therefore, it is necessary to improve the structure of grit chambers to enhance their treatment performance. Utility Model Content

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is: how to provide a vortex grit chamber with higher settling efficiency, better sand discharge, and lower maintenance cost.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A vortex sedimentation tank includes an annular tank body, a sand hopper disposed downward at the center of the bottom of the tank body, a vortex stirring device disposed at the center of the tank body, an inlet disposed on one side of the lower part of the tank body, and an outlet disposed on one side of the upper part of the tank body. The tank body is characterized in that a guide baffle is disposed at the bottom of the tank body, the guide baffle is disposed vertically and the horizontal cross section is an arc shape coaxial with the tank body.

[0008] In this way, the guide baffle is an arc shape coaxial with the pool body, so it will not affect the circular movement of the water flow. However, the baffle increases the contact area with the sand particles. Some sand particles will settle down first after colliding with the baffle during their outward rotation, thus better guiding the sand particles to settle and improving the settling efficiency. It is particularly suitable for use in wastewater treatment with high silt content.

[0009] Furthermore, the horizontal cross-section of the guide baffle is of a minor arc shape and is arranged symmetrically along the axis of the pool body, and the openings of the opposing guide baffles are arranged obliquely opposite to the flow inlet.

[0010] This allows the silt in the incoming water to better enter the area inside the guide baffle and settle after impact.

[0011] Furthermore, the guide baffles on the same side have two pieces arranged at intervals in the diametrical direction.

[0012] In this way, the area between the two guide baffles can better facilitate the settling of sediment.

[0013] Furthermore, multiple sand-passing holes are provided between the lower end of the guide baffle and the bottom of the pool.

[0014] This allows the sediment to settle downwards along the guide baffle and then flow through the sand passage holes into the sand hopper in the middle.

[0015] Furthermore, the bottom outer side of the pool is sloped upwards. This facilitates the flow of sediment settling at the bottom of the pool towards the sand hopper in the center.

[0016] Furthermore, the stirring device includes a stirring shaft vertically arranged along the axis of the tank body. The lower end of the stirring shaft extends to the bottom of the sand hopper and a stirring blade located in the middle of the tank body is provided. The stirring shaft is a hollow tube with a dynamic sealing structure at the upper end, and is rotatably mounted on a support frame at the upper end of the tank body. An air lift pipe is coaxially sleeved inside the stirring shaft and relatively fixed to the support frame. An air pump is installed on the support frame and communicates with the upper end of the air lift pipe. A sand discharge pipe is also installed on the support frame and communicates with the upper end of the stirring shaft through the sand discharge pump. A stirring motor is also installed on the support frame, and the stirring motor is connected to the stirring shaft in a drive connection.

[0017] In this way, the stirring motor drives the stirring shaft and stirring blades to rotate, realizing the swirling function. At the same time, the air pump pumps air to the air lift pipe, which works in conjunction with the sand discharge pump to realize the air lift function (that is, the gas pumped out by the air pump mixes with the mud and sand to form a mixture of mud, sand, air and water, which is then pumped away by the sand discharge pump), so as to remove the mud and sand at the bottom of the sand hopper in a timely manner and better ensure the smoothness of sand discharge.

[0018] Furthermore, stirring protrusions are provided on the outer periphery near the lower end of the stirring shaft. This facilitates stirring of the sand hopper.

[0019] Furthermore, the inlet is tangentially connected and located at the lower part of the pool body. This facilitates better swirling of the incoming water.

[0020] Furthermore, the outlet is tangentially connected to the upper part of the pool body, and the lower surface of the outlet has a sand-separating plate that extends horizontally into the pool body for a certain distance.

[0021] This helps to better prevent mud and sand from flowing out of the outlet.

[0022] In summary, this utility model has the advantages of higher settling efficiency, better sand discharge, and lower structural and maintenance costs. Attached Figure Description

[0023] Figure 1 This is a top-view structural diagram of the present invention. The arrows in the diagram indicate the direction of water flow.

[0024] Figure 2 This is a structural schematic diagram of the present invention from the front view. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0026] Detailed implementation method: See Figure 1 and Figure 2 A vortex sedimentation tank includes an annular tank body 1, a sand hopper 2 located downwards at the center of the bottom of the tank body 1, a vortex stirring device located at the center of the tank body 1, an inlet 3 located on one side of the lower part of the tank body, and an outlet 4 located on one side of the upper part of the tank body. The tank body is characterized by a guide baffle 5 located at the bottom of the tank body. The guide baffle 5 is vertically arranged and its horizontal cross section is an arc shape coaxial with the tank body.

[0027] In this way, the guide baffle is an arc shape coaxial with the pool body, so it will not affect the circular movement of the water flow. However, the baffle increases the contact area with the sand particles. Some sand particles will settle down first after colliding with the baffle during their outward rotation, thus better guiding the sand particles to settle and improving the settling efficiency. It is particularly suitable for use in wastewater treatment with high silt content.

[0028] The guide baffle 5 has a horizontal cross-section that is slightly curved and is arranged symmetrically along the axis of the pool. The openings of the guide baffles are arranged in opposite directions and the inlet is arranged obliquely to each other.

[0029] This allows the silt in the incoming water to better enter the area inside the guide baffle and settle after impact.

[0030] Among them, the guide baffle 5 on the same side has two pieces arranged at intervals in the diametrical direction.

[0031] In this way, the area between the two guide baffles can better facilitate the settling of sediment.

[0032] Among them, multiple sand passage holes 6 are provided between the lower end of the guide baffle 5 and the bottom of the pool.

[0033] This allows the sediment to settle downwards along the guide baffle and then flow through the sand passage holes into the sand hopper in the middle.

[0034] The bottom outer side of pool 1 is inclined upwards. This facilitates the flow of sediment settling at the bottom of the pool to the sand hopper in the middle.

[0035] The stirring device includes a stirring shaft 7 vertically arranged along the axis of the tank body. The lower end of the stirring shaft 7 extends to the bottom of the sand hopper and the middle is provided with stirring blades 8 located in the tank body. The stirring shaft 7 is a hollow tube with a dynamic sealing structure at the upper end, and is rotatably mounted on a support frame 9 at the upper end of the tank body. An air lift pipe 10 is coaxially sleeved inside the stirring shaft and relatively fixed to the support frame. An air pump 11 is installed on the support frame and communicates with the upper end of the air lift pipe 10. A sand discharge pipe 12 is also installed on the support frame and communicates with the upper end of the stirring shaft 7 through a sand discharge pump 13. A stirring motor 16 is also installed on the support frame 9 and is connected to the stirring shaft 7 in a driving connection.

[0036] In this way, the stirring motor drives the stirring shaft and stirring blades to rotate, realizing the swirling function. At the same time, the air pump pumps air to the air lift pipe, which works in conjunction with the sand discharge pump to realize the air lift function (that is, the gas pumped out by the air pump mixes with the mud and sand to form a mixture of mud, sand, air and water, which is then pumped away by the sand discharge pump), so as to remove the mud and sand at the bottom of the sand hopper in a timely manner and better ensure the smoothness of sand discharge.

[0037] The stirring shaft 7 has stirring protrusions 14 on its outer periphery near the lower end. This facilitates stirring of the sand hopper.

[0038] The inlet 3 is tangentially connected and located at the lower part of the pool body. This facilitates better swirling of water during inflow.

[0039] The outlet 4 is tangentially connected to the upper part of the pool body, and the lower surface of the outlet has a sand-separating plate 15 that extends horizontally into the pool body for a distance.

[0040] This helps to better prevent mud and sand from flowing out of the outlet.

Claims

1. A vortex grit chamber, comprising an annular chamber body, a sand hopper disposed downwards at the center of the bottom of the chamber body, a vortex stirring device disposed at the center of the chamber body, an inlet disposed on one side of the lower part of the chamber body, and an outlet disposed on one side of the upper part of the chamber body, characterized in that, The bottom of the pool is also equipped with a guide baffle, which is set vertically and has a horizontal cross-section that is coaxial with the pool body.

2. The vortex grit chamber as described in claim 1, characterized in that, The guide baffles have a slightly curved horizontal cross section and are arranged symmetrically along the axis of the pool. The openings of the opposite guide baffles are arranged obliquely opposite to the inlet.

3. The vortex grit chamber as described in claim 2, characterized in that, The guide baffle on the same side has two pieces arranged at intervals in the diametrical direction.

4. The vortex grit chamber as described in claim 3, characterized in that, Multiple sand passage holes are provided between the lower end of the guide baffle and the bottom of the pool.

5. The vortex grit chamber as described in claim 1, characterized in that, The bottom outer side of the pool is inclined upwards.

6. The vortex grit chamber as described in claim 3, characterized in that, The mixing device includes a mixing shaft vertically arranged along the axis of the tank body. The lower end of the mixing shaft extends to the bottom of the sand hopper and the middle part is provided with mixing blades located inside the tank body. The mixing shaft is a hollow tube with a dynamic sealing structure at the upper end, and is rotatably mounted on a support frame at the upper end of the tank body. An air lift pipe is coaxially sleeved inside the mixing shaft and relatively fixed to the support frame. An air pump is installed on the support frame and communicates with the upper end of the air lift pipe. A sand discharge pipe is also installed on the support frame and communicates with the upper end of the mixing shaft through the sand discharge pump. A mixing motor is also installed on the support frame and is drivenly connected to the mixing shaft.

7. The vortex grit chamber as described in claim 6, characterized in that, The outer periphery near the lower end of the stirring shaft is also equipped with stirring protrusions.

8. The vortex grit chamber as described in claim 1, characterized in that, The inlet is tangentially connected and located at the bottom of the pool.

9. The vortex grit chamber as described in claim 1, characterized in that, The outlet is tangentially connected and located at the upper part of the pool body, and the lower surface of the outlet has a sand-separating plate that extends horizontally into the pool body for a certain distance.

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