Cyclone Grit Chamber

Abstract

This invention relates to the field of wastewater treatment technology and provides a vortex grit chamber. The vortex grit chamber includes a sedimentation tank, a guide tube, and an inclined inlet structure. The guide tube is suspended in the sedimentation tank, and the inclined inlet structure is tangentially connected to the guide tube, with the flow directed from high to low into the guide tube. Through this structural arrangement, high-speed water flows tangentially into the guide tube via the inclined inlet structure. The kinetic energy of the high-speed water flow is converted into potential energy by the gentle flow slope, reducing direct impact on internal components. Simultaneously, the vortex direction of the inclined water flow and the guide tube works in tandem to form a stable spiral downward flow pattern, avoiding short-circuiting and effectively reducing local turbulent kinetic energy at the inlet position, thus minimizing head loss.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a vortex grit chamber. Background Technology

[0002] In the field of municipal and industrial wastewater treatment, vortex grit chambers are key pretreatment equipment that utilizes centrifugal force to achieve solid-liquid separation. Their flow field stability and hydraulic efficiency directly affect the grit removal effect and system operating energy consumption. Traditional vortex grit chambers generally adopt a top-inlet design. In this structural design, on the one hand, the high-level inlet shortens the effective flow path of the water in the tank, making it difficult to form a complete spiral progressive flow pattern and easily causing short-circuiting phenomena, resulting in some grit particles being discharged with the water flow before completing centrifugal settling; on the other hand, there is a large potential energy difference between the inlet and the central area of ​​the tank. The high-speed inflow fluid directly impacts the internal components such as the guide plate and grit collection hopper, inducing a sudden increase in local turbulence intensity and significantly increasing the system head loss. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a vortex grit chamber.

[0004] The present invention provides a vortex grit chamber, comprising: a sedimentation tank; a guide tube suspended in the sedimentation tank; and an inclined water inlet structure tangentially connected to the guide tube, wherein the inclined water inlet structure guides the water to the guide tube in a direction from high to low.

[0005] According to the present invention, a vortex grit chamber is provided, wherein the inclined water inlet structure includes: a direct flow section, which is horizontally arranged; and an inclined flow section, one end of which is connected to the direct flow section and the other end of which extends obliquely downward and communicates with the guide tube.

[0006] According to the present invention, a vortex grit chamber is provided, wherein the inclined inlet structure further includes a variable cross-section tangential section, one end of which is connected to the inclined flow section, and the other end of which is tangentially connected to the guide tube, and the flow cross-section of the variable cross-section tangential section gradually decreases along the sewage diversion direction.

[0007] According to the present invention, a vortex grit chamber is provided, wherein the guide tube includes: a basic guide section, the basic guide section being suspended above the sedimentation tank; and an extended guide section, the extended guide section having the same diameter as the basic guide section and being coaxially connected to the lower end of the basic guide section.

[0008] According to the present invention, a vortex sedimentation tank further includes: a central cylinder, which is spaced and sleeved inside the guide cylinder; a reflecting frustum, which is located below the guide cylinder and connected to the lower end of the central cylinder; and an outlet channel, which is circumferentially arranged around the top of the central cylinder.

[0009] According to the present invention, in a vortex sedimentation tank, the reflecting frustum is coaxially arranged with the central cylinder, and the small end of the reflecting frustum is connected to the lower end of the central cylinder.

[0010] According to the present invention, a vortex sedimentation tank is provided, wherein the central cylinder comprises: a cylinder body, the cylinder body being spaced out and sleeved inside the guide cylinder, the lower end of the cylinder body being connected to the small end of the reflecting frustum; a connecting hole, the connecting hole being opened to the side wall of the cylinder body; and a guide vane, the guide vane being disposed at the edge of the connecting hole, and the guide vane being inclined toward the inner side of the cylinder body.

[0011] According to the present invention, a vortex sedimentation tank is provided, wherein there are multiple connecting holes, and the multiple connecting holes are evenly arranged on the side wall of the cylinder with the center of the cylinder as the array center; each connecting hole is provided with a flow guide wing on its edge.

[0012] According to the present invention, a vortex sedimentation tank is provided, wherein the connecting hole is a rectangular hole, and the guide vanes are provided on all four edges of the rectangular hole.

[0013] According to the present invention, the cone angle of the reflecting frustum is 60°; the included angle between the guide vane and the side wall of the cylinder is 15°.

[0014] The vortex grit chamber provided by this invention includes a sedimentation tank, a guide cylinder, and an inclined inlet structure. The guide cylinder is suspended in the sedimentation tank, and the inclined inlet structure is tangentially connected to the guide cylinder, with the inclined inlet structure guiding the flow to the guide cylinder in a downward direction. Through this structural arrangement, high-speed water flows tangentially into the guide cylinder via the inclined inlet structure. The kinetic energy of the high-speed water flow is converted into potential energy by the gentle flow slope, reducing direct impact on internal components. Simultaneously, the vortex direction of the inclined water flow and the guide cylinder works in tandem to form a stable spiral downward flow pattern, avoiding short-circuiting and effectively reducing local turbulent kinetic energy at the inlet position, thus minimizing head loss. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a simplified three-dimensional structural diagram of the vortex grit chamber provided by the present invention.

[0017] Figure 2 This is a schematic top view of the vortex grit chamber provided by the present invention.

[0018] Reference numerals: 100, guide tube; 110, basic guide section; 120, extended guide section; 200, oblique water inlet structure; 210, direct flow section; 220, oblique flow section; 230, variable cross-section tangential section; 300, central tube; 400, reflective frustum; 500, water outlet channel; 600, connecting hole. Detailed Implementation

[0019] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0020] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0022] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate different embodiments or examples and features of different embodiments or examples described in this specification to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The following is combined Figure 1 and Figure 2 This invention describes a vortex grit chamber provided in an embodiment of the invention. It should be understood that the following description is merely an illustrative embodiment of the invention and does not constitute any particular limitation on the invention.

[0025] An embodiment of the present invention provides a vortex grit chamber, such as... Figure 1 and Figure 2 As shown, the vortex grit chamber includes: a sedimentation tank; a guide cylinder 100 suspended in the sedimentation tank; and an inclined water inlet structure 200 tangentially connected to the guide cylinder 100, with the inclined water inlet structure 200 guiding the water to the guide cylinder 100 in a direction from high to low.

[0026] The vortex grit chamber provided by the present invention includes a sedimentation tank, a guide cylinder 100, and an inclined water inlet structure 200. The guide cylinder 100 is suspended in the sedimentation tank, and the inclined water inlet structure 200 is tangentially connected to the guide cylinder 100, and the inclined water inlet structure 200 guides the water to the guide cylinder 100 in a direction from high to low.

[0027] With this structural design, firstly, as the high-speed incoming flow descends along the gentle slope of the inclined inlet structure 200, part of the kinetic energy of the water flow is dissipated in a stepwise manner through the frictional resistance of the inclined surface and the accumulation of gravitational potential energy. This effectively reduces the instantaneous impact momentum of the incoming fluid on the inner wall of the guide tube 100, thereby suppressing component vibration and turbulent kinetic energy accumulation caused by high-speed impact. Secondly, the inclined inlet direction and the swirling direction of the guide tube 100 form a hydrodynamic match, significantly enhancing the centrifugal flow field dominated by the circumferential velocity component, forming a stable three-dimensional flow spiraling down along the tube wall. This design avoids the vertical circulation interference caused by traditional top-entry systems, reducing the incidence of short-circuiting. Furthermore, by guiding the water flow to a smooth transition to a swirling state through a potential energy gradient, the peak turbulent kinetic energy in the inlet area decreases, the local vortex size shrinks, and energy dissipation caused by turbulent pulsations is reduced, thereby reducing the overall head loss of the system. In addition, the stable spiral flow extends the effective settling path of sand particles in the centrifugal force field, increasing the retention rate of sand particles with a diameter of 200 μm or larger, while reducing hydraulic shear strength and suppressing the secondary suspension of already settled sand particles.

[0028] In one embodiment of the present invention, the oblique water inlet structure 200 includes: a direct flow section 210, which is horizontally arranged; and an oblique flow section 220, one end of which is connected to the direct flow section 210, and the other end of which extends obliquely downward and communicates with the guide tube 100.

[0029] Furthermore, in one embodiment of the present invention, the inclined water inlet structure 200 further includes: a variable cross-section tangent section 230, one end of which is connected to the inclined flow section 220, and the other end of which is tangentially connected to the guide tube 100. Along the sewage diversion direction, the flow cross section of the variable cross-section tangent section 230 gradually decreases.

[0030] like Figure 1 As shown, the DC section 210, the diagonal flow section 220 and the variable cross-section tangential section 230 are connected in sequence. The DC section 210 is set horizontally, the diagonal flow section 220 is set diagonally from high to low, and the variable cross-section tangential section 230 is tangentially connected to the guide tube 100.

[0031] Among them, the DC section 210 serves as the initial rectification section of the inlet channel. It eliminates the lateral disturbance caused by the deflection of the incoming fluid direction through the horizontal straight flow channel, maintains the momentum conservation of the water flow in the horizontal direction, forms a uniform velocity distribution, avoids the generation of local turbulence caused by the bending of the flow channel, and ensures that the initial high-speed water flow has a stable flow state when it enters the inclined inlet structure 200. This provides the flow field basis for the subsequent kinetic energy to potential energy conversion and reduces the interference of the preceding turbulence on the overall stability of the system.

[0032] The oblique flow section 220 is inclined downwards, for example, the angle between the oblique flow section 220 and the horizontal plane is 23°. When the water flows down the slope, it is affected by the accumulation of gravitational potential energy, and part of the kinetic energy is converted into potential energy. The frictional resistance of the slope generates a laminar boundary layer effect, the flow velocity decreases along the path, and the inflow impact momentum is reduced; the peak shear stress on the wall of the guide tube 100 decreases, which significantly inhibits the wear of the components.

[0033] The cross-section of the variable cross-section tangential section 230 gradually narrows and is tangentially connected to the guide tube 100. Through the linear reduction of the flow channel cross-sectional area from the outlet of the oblique flow section 220 to the inlet of the guide tube 100, fluid acceleration and tangential momentum enhancement are achieved. The tangential connection angle is consistent with the swirling direction of the guide tube 100, reducing momentum exchange losses between the incoming fluid and the swirling flow. The tangential entry of the water flow into the guide tube 100 reduces the turbulent kinetic energy in the impact zone; the circumferential velocity component of the swirling field is increased, forming a more stable forced vortex core and improving the centrifugal sedimentation efficiency of sand particles.

[0034] In other words, the above three-section structure forms a progressive flow control of "rectification-deceleration-directional acceleration". The direct flow section 210 eliminates the initial disturbance, the oblique flow section 220 dissipates kinetic energy, and the variable cross-section section enhances tangential momentum. Ultimately, the high-speed water flow enters the guide tube 100 with a low impact and high tangential ratio, thereby reducing the inflow impact energy, improving the stability index of the swirling flow field, and enhancing the flow's anti-interference ability.

[0035] In one embodiment of the present invention, the guide tube 100 includes: a basic guide section 110, which is suspended above the sedimentation tank; and an extended guide section 120, which has the same diameter as the basic guide section 110 and is coaxially connected to the lower end of the basic guide section 110.

[0036] For example, as shown in the figure, the basic guide section 110 and the extended guide section 120 are both cylindrical structures with equal diameters, and the basic guide section 110 and the extended guide section 120 are coaxially connected. By axially extending the total height of the guide cylinder 100, a continuous and uniform columnar swirling channel is constructed, extending the effective action time of sand particles in the centrifugal force field, thereby improving the removal rate of sand particles with a diameter greater than or equal to 200 μm.

[0037] In one embodiment of the present invention, such as Figure 1 and Figure 2As shown, the vortex grit chamber also includes: a central cylinder 300, which is spaced and sleeved inside the guide cylinder 100; a reflecting frustum 400, which is located below the guide cylinder 100 and connected to the lower end of the central cylinder 300; and an outlet channel 500, which is circumferentially arranged around the top of the central cylinder 300.

[0038] Furthermore, in one embodiment of the present invention, the reflecting frustum 400 and the central cylinder 300 are coaxially arranged, and the small end of the reflecting frustum 400 is connected to the lower end of the central cylinder 300.

[0039] As described in the above embodiments, an annular flow channel is formed between the guide tube 100 (outer tube) and the central tube 300 (inner tube), enabling the independent development of primary vortex (outer side downward) and secondary vortex (inner side upward). The primary vortex spirals downward along the outer side of the guide tube 100, while the secondary vortex spirals upward along the inner side. The reflecting frustum 400 at the bottom of the guide tube 100 forces the downward flow of the primary vortex to turn, forming a secondary vortex that rises along the inner wall of the central tube 300. The upward secondary vortex spirals upward around the central tube 300, and there is a velocity difference between the upward vortex on the inner side and the downward vortex on the outer side, thus creating shear force at the interface. Smaller particles are separated from the water flow and deposited at the bottom of the tank under the action of fluid shear force, which helps to improve the sand removal efficiency. Clean water flows out from the top of the sedimentation tank through the outlet channel 500. The entire sand settling process relies solely on the force generated by the water flow, eliminating the need for aeration and stirring devices, resulting in a simple structure.

[0040] In one embodiment of the present invention, the cone angle of the reflecting frustum 400 can be set to 60°.

[0041] In one embodiment of the present invention, such as Figure 1 As shown, the central cylinder 300 includes: a cylinder body, which is spaced and sleeved inside the guide cylinder 100, and the lower end of the cylinder body is connected to the small end of the reflecting frustum 400; a connecting hole 600, which is opened to the side wall of the cylinder body; and a guide vane, which is disposed at the edge of the connecting hole 600 and is inclined towards the inner side of the cylinder body.

[0042] Furthermore, in one embodiment of the present invention, there are multiple connecting holes 600, which are evenly arrayed on the side wall of the cylinder with the center of the cylinder as the array center; each connecting hole 600 is provided with a flow guide fin on its edge.

[0043] More specifically, in one embodiment of the present invention, the connecting hole 600 is a rectangular hole, and guide vanes are provided on all four edges of the rectangular hole.

[0044] The angle between the guide vane and the side wall of the cylinder is 15°.

[0045] This structural design breaks down the central stagnation zone, guiding the water flow to be evenly distributed to the pool wall settling area. The guide vanes optimize the flow field distribution, reduce eddy current generation, and lower head loss. The addition of a 600mm connecting hole effectively optimizes the hydraulic flow pattern, enhances sand settling performance, and improves the efficiency of sand migration to the pool wall.

[0046] In the specific working process, during the water intake stage: sewage enters the lower part of the sedimentation tank through the inclined water intake structure 200. The water inlet adopts a variable cross-section tangent section 230, i.e., a gradually narrowing cross-section design. The water intake direction is tangent to the guide cylinder 100, which can ensure that the water flow avoids the orthogonal projection area of ​​the guide cylinder 100 and avoids direct impact on the inner guide cylinder 100 and other components. It can also make the water flow form a stable vortex along the inner wall of the sedimentation tank after entering the tank.

[0047] Cyclone separation stage: After the sewage enters the sedimentation tank, it slowly descends along the guide tube 100. The sand particles in the sewage form a forced vortex in the annular area between the outer wall of the guide tube 100 and the inner wall of the tank. Under the action of gravity and centrifugal force, the sand particles gradually settle in layers. Coarse sand (particle size ≥ 200 μm) moves towards the tank wall and settles in the initial stage of cyclone separation. Fine sand (particle size 100-200 μm) has a slower settling speed and needs to be further separated in the subsequent enhancement stage.

[0048] Enhanced separation stage: When the descending water flow reaches the reflecting frustum 400 at the bottom of the guide tube 100, some of its kinetic energy is converted into pressure energy, and the water flow direction changes from downward to upward, forming a secondary upward vortex. A velocity gradient is formed at the interface between the primary descending vortex (outer side) and the secondary upward vortex (inner side), generating shear force, which promotes the separation of fine sand particles from the water flow and accelerates their settling towards the bottom of the pool.

[0049] Sand collection stage: Multiple evenly distributed rectangular connecting holes 600 are designed on the wall of the central cylinder 300, with guide vanes at the edges of the connecting holes 600. The connecting holes 600 break the boundary of the central stagnation zone, guiding the water flow towards the pool wall; the guide vanes adjust the flow field direction, reduce eddy current generation, and prevent sand from accumulating in the central area. Through the design of the connecting holes 600 and the guide vanes, the sand migration path can be optimized, allowing the settled sand to gather at the bottom sand hopper by gravity. A submersible pump is used to remove the sand, which is periodically activated according to a preset sand removal cycle, transporting the sand to a sand-water separator for dewatering. In actual operation, the sand removal cycle can be adjusted according to changes in the sand content of the influent.

[0050] Drainage stage:

[0051] After the sediment is separated, the effluent flows out through the top annular effluent channel 500. The channel has a gradually expanding cross section, and the effluent enters the next treatment unit.

[0052] In one specific embodiment of the present invention, the designed processing capacity is 2000 m³ / h.

[0053] Traditional hydrocyclone sedimentation tanks require a tank body with a diameter of 6m, while the optimized version of this invention only requires a tank body with a diameter of 5m, and the floor area is reduced from 30m2 to 22m2.

[0054] During the water intake stage, wastewater enters the lower part of the pool at a 23° angle through the inclined inlet structure 200. The inlet adopts a tapered cross-section design, with the inlet width gradually decreasing from 800mm to 500mm and the flow velocity gradually decreasing from 1.2m / s to 0.8m / s. The water intake direction is designed as a tangential inlet close to the pool wall, which ensures that the water flow avoids the orthographic projection area of ​​the guide cylinder 100 and avoids direct impact on the guide cylinder 100 and other components. It also allows the water flow to form a stable vortex along the inner wall of the pool after entering the pool. CFD simulation shows that this design reduces the turbulent kinetic energy of the inlet by 45% and the head loss by 30%.

[0055] In the vortex separation stage, after the wastewater enters the tank, it forms a vortex along the inner wall of the tank and slowly descends along the outer wall of the guide cylinder 100. In this embodiment, by increasing the height of the guide cylinder 100 by 25%, specifically from 4m to 5m, the vortex path of the water flow is effectively extended, and the sand settling time is extended by 15%-20%. This causes the sand particles in the wastewater to form a forced vortex in the annular area between the outer wall of the cylinder and the inner wall of the tank, which can effectively improve the removal rate of fine sand. Under the action of gravity and centrifugal force, the sand particles gradually settle in layers. Coarse sand moves towards the tank wall and settles in the initial stage of vortex, while fine sand, due to its slower settling speed, needs to be further separated in the subsequent enhancement stage.

[0056] During the enhanced separation stage, when the descending water flow reaches the 60° conical reflective frustum 400 at the bottom of the guide tube 100, some of its kinetic energy is converted into pressure energy, and the water flow direction changes from downward to upward, forming a secondary upward vortex. A velocity gradient is formed at the interface between the primary descending vortex (outer side) and the secondary upward vortex (inner side), generating shear force that promotes the separation of fine sand particles from the water flow, accelerating their settling to the bottom of the pool. CFD simulations show that this design increases the removal rate of 100-200μm sand and gravel from 40% in traditional structures to 65%.

[0057] During the sand collection stage, eight evenly distributed rectangular connecting holes 600 are designed on the wall of the central cylinder 300. Each connecting hole 600 measures 1000mm × 200mm, and guide vanes with a 15° inclination are designed at the edge of the connecting holes 600. The connecting holes 600 can break the boundary of the central stagnation zone and guide the water flow towards the pool wall; the guide vanes can adjust the flow field direction, reduce eddy current generation, and prevent sand particles from accumulating in the central area. Through the design of the connecting holes 600 and the guide vanes, the migration path of sand particles can be optimized, allowing the settled sand particles to gather at the bottom sand hopper by gravity. A submersible sewage pump is used for sand removal, with a preset sand removal cycle of once per hour, transporting the sand particles to a sand-water separator for dewatering treatment. In actual operation, the sand removal cycle can be adjusted according to the actual sand content of the influent.

[0058] During the drainage stage, the effluent after sediment separation is discharged through the top annular effluent channel 500. The channel adopts a gradually expanding cross section. In this embodiment, the outlet width is expanded from 500mm to 800mm, and the outlet flow velocity is 0.5m / s.

[0059] Based on this, by optimizing the kinetic energy of the inclined inlet, guiding the 100-meter high-efficiency swirling flow through the guide tube, and homogenizing the central flow field, the grit removal efficiency is significantly improved and the operating cost is reduced. It is especially suitable for high-flow-rate conditions and the renovation of old tanks, providing reliable technical support for improving the quality and efficiency of sewage treatment plants.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vortex grit chamber, characterized in that include: Sedimentation tank; A flow guide tube (100) is suspended in the sedimentation tank; An inclined water inlet structure (200) is tangentially connected to the guide tube (100), and the inclined water inlet structure (200) guides the water to the guide tube (100) in a direction from high to low. The inclined water inlet structure (200) includes: DC section (210), wherein the DC section (210) is arranged horizontally; The oblique flow section (220) has one end connected to the direct flow section (210) and the other end of the oblique flow section (220) extends obliquely downward and communicates with the guide tube (100); The inclined water inlet structure (200) also includes: A variable cross-section tangential section (230) is formed, one end of which is connected to the oblique flow section (220), and the other end of which is tangentially connected to the guide tube (100). Along the sewage diversion direction, the flow cross section of the variable cross-section tangential section (230) gradually decreases. The vortex grit chamber also includes: A central cylinder (300) is spaced and sleeved inside the guide cylinder (100); A reflecting frustum (400) is located below the guide tube (100) and connected to the lower end of the central tube (300); Water outlet channel (500) is circumferentially arranged around the top of the central cylinder (300).

2. The vortex grit chamber according to claim 1, characterized in that The guide tube (100) includes: A basic guide section (110) is suspended above the sedimentation tank; An extended guide section (120) is provided, which has the same diameter as the basic guide section (110) and is coaxially connected to the lower end of the basic guide section (110).

3. The vortex grit chamber according to claim 1, characterized in that, The reflecting frustum (400) is coaxially arranged with the central cylinder (300), and the small end of the reflecting frustum (400) is connected to the lower end of the central cylinder (300).

4. The vortex grit chamber according to claim 1, characterized in that, The central cylinder (300) includes: The cylinder is spaced and sleeved inside the guide tube (100), and the lower end of the cylinder is connected to the small end of the reflecting frustum (400). A connecting hole (600) is provided, which extends to the side wall of the cylinder. A flow guide vane is disposed at the edge of the connecting hole (600) and is inclined toward the inner side of the cylinder.

5. The vortex grit chamber according to claim 4, characterized in that, The number of the connecting holes (600) is multiple, and the multiple connecting holes (600) are evenly arrayed on the side wall of the cylinder with the center of the cylinder as the array center; Each of the connecting holes (600) is provided with a flow guide vane on its edge.

6. The vortex grit chamber according to claim 5, characterized in that, The connecting hole (600) is a rectangular hole, and the guide vanes are provided on all four edges of the rectangular hole.

7. The vortex grit chamber according to claim 4, characterized in that, The cone angle of the reflecting frustum (400) is 60°; The angle between the guide vane and the side wall of the cylinder is 15°.

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