CN116474460A - Spiral sand-water separator for municipal engineering - Google Patents

Spiral sand-water separator for municipal engineering Download PDF

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Publication number
CN116474460A
CN116474460A CN202310298059.2A CN202310298059A CN116474460A CN 116474460 A CN116474460 A CN 116474460A CN 202310298059 A CN202310298059 A CN 202310298059A CN 116474460 A CN116474460 A CN 116474460A
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CN
China
Prior art keywords
sand
water
separation
spiral
cylinder
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Withdrawn
Application number
CN202310298059.2A
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Chinese (zh)
Inventor
宋伟
朱超云
李冰峰
胡虹
王瑞
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Nanjing Polytechnic Institute
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Nanjing Polytechnic Institute
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Priority to CN202310298059.2A priority Critical patent/CN116474460A/en
Publication of CN116474460A publication Critical patent/CN116474460A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/04—Combinations of filters with settling tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/31—Self-supporting filtering elements
    • B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

The invention provides a spiral sand-water separator for municipal engineering, which comprises a water tank, a first sand-water separation component and a spiral sand-water separation component, wherein the water tank is obliquely arranged at the bottom of the water tank; the inlet of the first sand-water separation component is communicated with the inlet of the water tank, and the outlet of the first sand-water separation component is communicated with the spiral sand-water separation component; the first sand-water separation assembly comprises an outer separation cylinder and an inner separation cylinder which are coaxially and vertically arranged, a separation cavity is formed between the outer separation cylinder and the inner separation cylinder, and an annular sealing plate is arranged at the top end of the outer separation cylinder; the bottom openings of the outer separating cylinder and the inner separating cylinder are communicated with the top opening of the sand outlet pipe; the lower parts of the cylinder walls of the outer separating cylinder and the inner separating cylinder are of filter screen structures, and the lower part of the sand outlet pipe is provided with a valve. The spiral sand-water separator provided by the invention has the advantages that the sedimentation speed of sand particles in the water tank is increased, the interference to sand sediment at the bottom of the water tank is reduced, and the sand-water separation efficiency is effectively improved.

Description

Spiral sand-water separator for municipal engineering
Technical Field
The invention belongs to the technical field of municipal engineering, and particularly relates to a spiral sand-water separator for municipal engineering.
Background
The water supply and drainage process in the municipal engineering field contains a small amount of sand grains with different specifications, and the sand grains can influence the normal operation of the subsequent process and the service life of the subsequent process equipment, so that a sand-water separator is used for separating sand from water. The sand-water mixed liquid enters a water tank of the sand-water separator from the upper end, sand grains with high density freely settle at the bottom of the inclined U-shaped groove under the action of gravity, a spiral in the U-shaped groove drives the sand grains at the bottom of the groove to move upwards along the direction of the inclined spiral axis, after leaving the liquid level, the sand grains continue to move upwards for a certain distance, water in the sand grains gradually flows back into the water tank, and when the sand grains separated from the water run to a discharge hole, the sand grains fall into a sand container under the action of gravity. The supernatant liquid after precipitation is discharged from the water outlet. The separation efficiency of the spiral sand-water separator in the prior art is relatively low, and the separation efficiency is generally shown in the following steps:
1. the separation efficiency of the spiral sand-water separator is related to the height of the water tank, and the larger the water tank, the more the sand grains have sufficient free sedimentation time, and the more the sand grains are settled at the bottom. The height of the water tank is usually designed to be equal to or greater than 0.2mm, and if sand grains with a separation grain size smaller than 0.2mm are required to be separated, a large water tank height is required to meet the corresponding sedimentation time.
2. The water inlet of the device directly enters from the upper part, the fluid is concentrated, the impact force on the floating liquid is larger, and the separation efficiency is reduced. Meanwhile, the sinking sand grains are disturbed, the sedimentation effect is directly affected, and part of sand grains float upwards and flow out of the water outlet along with the supernatant liquid, so that the separation effect is reduced.
3. Due to the limitations of the structure and fluid flow, only sand particles with a particle size of 0.2mm or more can be separated, but sand particles with a particle size of less than 0.2mm have no separation function basically, so that the efficient operation of the subsequent process is affected.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the spiral sand-water separator for municipal engineering is provided, the sedimentation speed of sand particles in a water tank is accelerated, the interference to sand sediment at the bottom of the water tank is reduced, and the sand-water separation efficiency is effectively improved.
In order to solve the technical problems, the embodiment of the invention provides a spiral sand-water separator for municipal engineering, which comprises a water tank, a first sand-water separation component and a spiral sand-water separation component, wherein the water tank is obliquely arranged at the bottom of the water tank, and the first sand-water separation component is arranged in the water tank; the inlet of the first sand-water separation component is communicated with the inlet of the water tank, the outlet of the first sand-water separation component is communicated with the spiral sand-water separation component, and the spiral sand-water separation component is used for collecting sand particles separated by the first sand-water separation component and sand particles freely precipitated in the water tank and discharging the sand particles out of the water tank; the first sand-water separation assembly comprises an outer separation cylinder and an inner separation cylinder which are coaxially and vertically arranged, a separation cavity is formed between the outer separation cylinder and the inner separation cylinder, and an annular sealing plate for sealing the top end of the separation cavity is arranged at the top end of the outer separation cylinder; the top end opening of the inner separating cylinder is an inlet of the first sand-water separation component, the bottom end openings of the outer separating cylinder and the inner separating cylinder are communicated with the top end opening of the sand outlet pipe, and the bottom end opening of the sand outlet pipe is an outlet of the first sand-water separation component; the wall of the outer separating cylinder and the wall of the inner separating cylinder forming the separating cavity are both of filter screen structures, and a valve is arranged at the lower part of the sand outlet pipe.
As a further improvement of the embodiment of the invention, the diameter of the holes of the filter screen structure of the inner separating cylinder is less than or equal to 0.5mm; the diameter of the holes of the filter screen structure of the outer separating cylinder is less than or equal to 0.25mm.
As a further improvement of the embodiment of the invention, a central cylinder is coaxially arranged in the inner separation cylinder, a second spiral sheet is arranged between the central cylinder and the inner separation cylinder, the outer diameter of the second spiral sheet is matched with the inner diameter of the inner separation cylinder, and the inner diameter of the second spiral sheet is matched with the outer diameter of the central cylinder; the helix angle of the second spiral sheet is 50-75 degrees.
As a further improvement of the embodiment of the invention, the second spiral sheet is made of a filter screen, and the diameter of the holes of the second spiral sheet is 2-5 mm.
As a further improvement of the embodiment of the invention, a third spiral sheet is arranged in the separation cavity, the outer diameter of the third spiral sheet is matched with the inner diameter of the outer separation cylinder, and the inner diameter of the third spiral sheet is matched with the outer diameter of the inner separation cylinder; the helix angle of the third spiral sheet is 50-75 degrees.
As a further improvement of the embodiment of the invention, the third spiral sheet is made of a filter screen, and the diameter of the holes of the third spiral sheet is 2-5 mm.
As a further improvement of the embodiment of the invention, an outlet is formed in the upper part of the side wall of the water tank, a sedimentation pipe is obliquely arranged in the water tank, the sedimentation pipe is positioned at the upper part in the water tank, and the upper end of the sedimentation pipe is lower than the lower end of the outlet.
As a further improvement of the embodiment of the invention, the second sand-water separation component comprises a sand collecting tank, a first spiral piece and a driving piece, wherein the sand collecting tank is obliquely paved along the bottom of the water tank, and the higher end of the sand collecting tank extends out of the water tank; the first spiral sheet is arranged in the sand collecting groove, and one end of the first spiral sheet is in transmission connection with the driving piece; the sand collecting tank is of a U-shaped structure, and a cover plate is arranged on a notch of the sand collecting tank positioned at the middle upper part of the water tank; the outlet of the first sand-water separation component is communicated with the sand collecting groove.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects: according to the spiral sand-water separator for municipal engineering, the first sand-water separation component is arranged in the water tank, the sand-water mixed solution is subjected to primary sand-water separation, sand grains with more than fine grain size and part of finer sand grains are trapped in the first sand-water separation component, the rest sand grains with the finer grain size enter the water tank along with the mixed solution, and the mixed solution is subjected to secondary sand-water separation through the spiral sand-water separation component. The primary sand-water separation of the first sand-water separation component reduces the sand grain quantity entering the water tank, is beneficial to the secondary sand-water separation in the water tank, and improves the integral sand-water separation effect. And moreover, the fluid separated by the first sand-water separation component enters the water tank from the filter screen holes of the outer separation cylinder, and fine high-speed fluid which is uniformly sprayed to the periphery is formed at different depths of the water tank, so that downward water flows at all heights and directions move smoothly, the disturbance to mixed liquid in the water tank is small, the disturbance to sand sediment at the bottom of the water tank is reduced, and the separation and sedimentation effects are good. The first sand-water separation assembly can generate fine water flows with different depths and different directions in the water tank, and the full range and the full depth can prevent upward flowing liquid in the water tank from flowing when the fine water flows down due to wide coverage range, so that the upward floating of finer sand grains can be continuously prevented, more finer sand grains can change the direction and move downwards, and meanwhile, the sedimentation speed of sand grains in the water tank can be increased, so that the separation efficiency can be improved. Only the mixed liquid separated by the first sand-water separation component can enter the water tank, namely, the water entering the water tank adopts a multi-level and multi-directional distribution mode, downward flow in each height and each direction is effectively distributed, the water body in the water tank is acted at different depths, the falling water body increases the sedimentation velocity of finer sand grains in the fine water flow, the floating of the finer sand grains is continuously prevented, and the separation efficiency is improved again.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a spiral sand-water separator according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a first sand-water separation assembly according to an embodiment of the present invention.
The drawings are as follows: the device comprises a driving piece 1, a first spiral sheet 2, a sand collecting groove 3, a cover plate 31, a water tank 4, a sedimentation pipe 5, a spiral separation assembly 6, a first sand-water separation assembly 7, an inlet 71, a sealing plate 72, an outer separation cylinder 73, a second spiral sheet 74, a central cylinder 75, an inner separation cylinder 76, a sand outlet pipe 77, a third spiral sheet 78, an outlet 8, a valve 9 and a discharge hole 10.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings.
For convenience of description, the particle size of the separated sand particles in the present invention is defined as follows: the grain size of the larger sand grains is more than 0.5mm, the grain size of the fine sand grains is 0.25-0.5 mm, and the grain size of the finer sand grains is less than 0.25mm.
The embodiment of the invention provides a spiral sand-water separator, which is shown in fig. 1 and comprises a water tank 4, a first sand-water separation component 7 and a spiral sand-water separation component 6, wherein the water tank is obliquely arranged at the bottom. A first grit-water separation assembly 7 is disposed within the water tank 4. The upper part of the water tank is not completely sealed and is communicated with the atmosphere. The inlet of the first sand-water separation component 7 is communicated with the inlet of the water tank 4, and specifically, the top end of the first sand-water separation component 7 is directly arranged in the inlet at the top of the water tank 4 in a penetrating way. The outlet of the first sand-water separation assembly 7 is communicated with the inlet of the spiral sand-water separation assembly 6. In this embodiment, the sand-water mixed liquid does not directly enter the water tank from the inlet of the water tank, but enters the first sand-water separation component 7 from the inlet of the first sand-water separation component 7, the first sand-water separation component 7 filters the sand-water mixed liquid, the filtered liquid flows into the water tank 4, the separated sand grains are sent into the spiral sand-water separation component 6, and the spiral sand-water separation component 6 collects the sand grains separated by the first sand-water separation component 7 and the sand grains freely precipitated in the water tank and discharges the sand grains out of the water tank 4.
Wherein the spiral sand-water separation assembly 6 can adopt the existing structure. The spiral sand-water separation assembly 6 in this embodiment comprises a sand collection trough 3, a first screw flight 2 and a drive member 1. The sand collecting tank 3 is obliquely paved along the bottom of the water tank 4, and the higher end of the sand collecting tank 3 extends out of the water tank. The inclination angle of the inner bottom of the water tank is 20-30 degrees, and the inclination angle of the sand collecting groove 3 is consistent with the inner bottom of the water tank. The sand collecting tank 3 is of a U-shaped structure, and the notch of the sand collecting tank 3 is the inlet of the spiral sand-water separation component. The bottom of the higher end of the sand collecting tank is provided with a discharge hole 10, the discharge hole 10 is used for discharging sand grains, and the height of the discharge hole 10 is higher than that of the top end of the water tank, so that the sand grains are dehydrated. The first spiral sheet 2 is arranged in the sand collecting groove 3, is coaxial with the sand collecting groove and is matched with the sand collecting groove. One end of the first spiral sheet 2 is in transmission connection with the driving piece 1, the driving piece drives the first spiral sheet 2 to rotate, the first spiral sheet drives sand grains in the sand collecting groove to move upwards from below, and when the sand grains run to the discharge hole 10, the sand grains fall into the sand containing container under the action of gravity. Preferably, a cover plate 31 is arranged on the notch of the sand collecting groove 3 positioned at the middle upper part of the water tank 4, so that on one hand, the interference of fluid in the water tank on sand grains in the sand collecting groove 3 is reduced, and on the other hand, the sand grains which are freely precipitated in the water tank slide down into the lower half section of the sand collecting groove. The outlet of the first sand-water separation assembly 7 is communicated with an uncovered notch at the lower part of the sand collecting groove 3.
As shown in fig. 2, the first sand-water separation assembly 7 in this embodiment includes an outer separation cylinder 73 and an inner separation cylinder 76 that are coaxially and vertically disposed, and a separation chamber is formed between the outer separation cylinder 73 and the inner separation cylinder 76. The height of the top end of the outer separating cylinder is lower than that of the top end of the inner separating cylinder, and the distance between the top end of the inner separating cylinder and the top end of the outer separating cylinder is 1/5-1/4 of the length of the inner separating cylinder. The top end of the outer separation cylinder 73 is provided with an annular sealing plate 72 for closing the top end of the separation chamber so that fluid entering between the inner separation cylinder 76 and the outer separation cylinder 73 does not flow out from the top end of the outer separation cylinder. The top end opening 71 of the inner separating cylinder 76 is the inlet of the first sand-water separation component, the bottom end openings of the outer separating cylinder 73 and the inner separating cylinder 76 are both communicated with the top end opening of the sand outlet pipe 77, and the bottom end opening of the sand outlet pipe 77 is the outlet of the first sand-water separation component. Specifically, the bottom end of the sand outlet pipe 77 is inserted into the notch of the lower part of the sand collecting tank. The outer separating cylinder 73 and the inner separating cylinder 76 are thin-walled cylinders, the walls of the outer separating cylinder are of a filter screen structure, the walls of the inner separating cylinder 76 below the sealing plate 72 are of a filter screen structure, namely, the walls of the outer separating cylinder 73 and the inner separating cylinder 76 forming a separating cavity are of a filter screen structure. The lower part of the sand outlet pipe 77 of the inner separating cylinder is provided with a valve 9.
The spiral sand-water separator of the embodiment also comprises a water pump and a valve of an inlet and outlet pipeline, the water pump enables the sand-water mixed solution to generate certain flow and lift (pressure), the sand-water mixed solution enters the separating cylinder 76 from the top end inlet 71 of the first sand-water separation component, and certain pressure is formed in the first sand-water separation component 7. The valve on the inlet and outlet pipeline is used for controlling the liquid level in the water tank.
In operation, the spiral sand-water separator of the above embodiment firstly closes the valve 9 and simultaneously opens the water pump to input the sand-water mixture into the first sand-water separation component 7 from the inlet 71 of the first sand-water separation component, so that a certain pressure is formed in the first sand-water separation component 7. The sand-water mixture reaching the filter screen structure of the inner separator bowl 76 flows outwardly under pressure, and the sand particles having a particle size greater than the diameter of the perforations of the inner separator bowl are retained by the inner separator bowl in the inner separator bowl, and a majority of the sand particles having a particle size less than the diameter of the perforations of the inner separator bowl enter the separation chamber with the fluid passing through the perforations of the inner separator bowl. After the fluid reaches the separating cavity, the fluid continues to flow outwards under a certain pressure, sand grains with the particle size larger than the diameter of the holes of the outer separating cylinder are trapped by the outer separating cylinder and are positioned in the separating cavity, and most of the sand grains with the particle size smaller than the diameter of the holes of the outer separating cylinder pass through the holes of the outer separating cylinder and enter the water tank together with the fluid. The sand particles in the inner separation cartridge and the sand particles in the separation chamber both fall down into the sand outlet pipe 77. Fluid entering the tank from the first separation assembly at different heights and in different directions continues to prevent sand particles in the tank from floating up, while fluid flowing into the tank from the upper portion of the first separation assembly also prevents sand particles in fluid flowing into the tank from the lower portion of the first separation assembly from floating up. The fluid falls to drive sand grains to settle downwards, so that the settling speed is increased. Part of sand grains are directly settled in the notch of the lower section of the sand collecting tank, and part of sand grains are settled on the cover plate 31 of the upper section of the sand collecting tank and then slide down along the cover plate into the notch of the lower half section of the sand collecting tank. The driving piece 1 drives the first spiral piece 2 to rotate, the first spiral piece 2 drives sand grains in the sand collecting groove to move upwards from bottom to top, and when the sand grains run to the discharge hole 10, the sand grains fall into the sand containing container under the action of gravity. In the first scheme, after a first preset period of time, the water pump is turned off, the valve 9 is opened, and sand grains in the sand outlet pipe 77 fall into the sand collecting tank under the combined action of atmospheric pressure and gravity. The driving piece 1 drives the first spiral piece 2 to rotate, the first spiral piece 2 drives sand grains in the sand collecting groove to move upwards from bottom to top, and when the sand grains run to the discharge hole 10, the sand grains fall into the sand containing container under the action of gravity. After a second preset period of time, the valve 9 is closed again, and the water pump is started at the same time, and the above procedure is repeated. In the second scheme, after a first preset time period, the valve 9 is opened, most of the sand-water mixed liquid flows downwards to enter the sand outlet pipe with larger section size under the combined action of the pressure of the water pump and the gravity, and sand grains in the sand outlet pipe 77 are flushed into the sand collecting tank. The second driving piece 1 drives the first spiral piece 2 to rotate, the first spiral piece 2 drives sand grains in the sand collecting groove to move from bottom to top, and when the sand grains run to the discharge hole 10, the sand grains fall into the sand containing container under the action of gravity. After a second preset period of time, the valve 9 is closed again and the above procedure is repeated.
Preferably, the first preset time period and the second preset time period are comprehensively considered according to the content of sand grains in the mixed liquor, the volumes of the first sand-water separation assembly 7 and the sand outlet pipe 77, and the like. Preferably, the first preset time period is greater than or equal to 20min, and the second preset time period is 0.5-2 min.
According to the spiral sand-water separator for municipal engineering, the first sand-water separation component is arranged in the water tank, the sand-water mixed liquid is subjected to primary sand-water separation, sand grains with more than fine grain size and part of finer sand grains are trapped in the first sand-water separation component, the rest sand grains with the finer grain size enter the water tank along with the mixed liquid, and the mixed liquid is subjected to secondary sand-water separation through the spiral sand-water separation component. The primary sand-water separation of the first sand-water separation component reduces the quantity of sand grains entering the water tank, is beneficial to the secondary sand-water separation in the water tank, and improves the integral sand-water separation effect. And moreover, the fluid separated by the first sand-water separation component enters the water tank from the filter screen holes of the outer separation cylinder, and fine high-speed fluid which is uniformly sprayed to the periphery is formed at different depths of the water tank, so that downward water flows at all heights and directions move smoothly, the disturbance to the mixed liquid in the water tank is small, and the separation and precipitation effects are good. The first sand-water separation assembly is used for generating fine water flows with different depths and different directions in the water tank, and the water flows upwards in the water tank are blocked in multiple directions and multiple heights when falling due to wide coverage range, so that the upward floating of finer sand grains is continuously prevented, more finer sand grains are driven to change directions and move downwards, and the sedimentation speed of the sand grains is increased, so that the separation efficiency is improved. Only the mixed liquid separated by the first sand-water separation component can enter the water tank, namely, the water entering the water tank adopts a multi-level and multi-directional distribution mode, downward flow of each height and each direction is effectively distributed, the water in the water tank is acted on at different depths, and after the sand grains descend the hole pitch of a filter screen, the sand grains are acted by downward force generated by fine high-speed fluid sprayed by holes at the lower part, the downward force is continuously generated on the sand grains, the sedimentation rate of finer sand grains in the fine water flow is continuously increased by the fallen water body, the upward floating of the finer sand grains is continuously prevented, and the separation efficiency is further improved. The spiral sand-water separator for municipal engineering can effectively improve the distribution state and sedimentation mode of sand-water mixed liquid, reduce the interference to sand sediment at the bottom of a water tank, accelerate the sedimentation speed of sand and effectively improve the sand-water separation efficiency.
As a preferred example, the outlet 8 is formed in the upper portion of the side wall of the water tank 4, the sedimentation pipe 5 is obliquely arranged in the water tank, the sedimentation pipe 5 is positioned in the upper portion of the water tank 4, and the upper end of the sedimentation pipe is lower than the lower end of the outlet 8. The settling tube 5 is inclined to increase settling time of the supernatant, further purifying the supernatant water quality. Supernatant fluid precipitated by the precipitation pipe 5 is discharged from the outlet 8, and the outlet at a higher position is beneficial to improving the sand-water separation effect and the quality of the supernatant fluid. The sedimentation pipe 5 is arranged around the first sand-water separation component 7, so that the fine fluid sprayed from the first sand-water separation component 7 covers the plane below the sedimentation pipe 5, thereby improving the free sedimentation effect of particles in the water tank. After sedimentation through the sedimentation pipe 5, finer sand grains are gathered and then sink, and fine water flow sprayed out of the outer separation cylinder accelerates the sinking of the fine water flow in different depths and directions, so that the separation efficiency is improved.
As a preferred example, a central cylinder 75 is coaxially arranged in the inner separating cylinder 76, a second spiral piece 74 is arranged between the central cylinder 75 and the inner separating cylinder 76, the top end of the second spiral piece 74 is identical to the top end of the outer separating cylinder in height, and the bottom end of the second spiral piece 74 is flush with the bottom end of the inner separating cylinder. The outer diameter of the second spiral piece 74 is adapted to the inner diameter of the inner separation barrel 76, and the inner diameter of the second spiral piece 74 is adapted to the outer diameter of the central barrel 75. The larger sand grains entering the inner separating cylinder are guaranteed to move downwards along with the fluid along the surface of the second spiral piece, spiral movement is generated, the fluid containing the larger sand grains can not move directly from top to bottom, accordingly, the larger sand grains have sufficient sinking time, and meanwhile, the downward fluid is prevented from impacting the sand grains at the bottom of the inner separating cylinder, so that the separating effect is guaranteed. The second flight 74 has a pitch angle of 50-75, and a larger pitch angle is selected to facilitate downward sliding of sand on the spiral surface until it is submerged in the bottom of the inner separator bowl.
Preferably, the second flight 74 is made of a screen, and the diameter of the holes of the second flight is 2-5 mm. When the mixed liquor enters the separation drum 76 from the inlet 71 and reaches the second screw, under a certain pressure, most of the fluid passes through the holes of the inner separation drum into the separation chamber with the sand particles with a particle size smaller than the hole diameter of the separation drum, the sand particles with a particle size larger than the hole diameter of the separation drum are trapped between the second screw by the separation drum, and a small part of the fluid slides down the screw surface of the second screw with the sand particles with a particle size larger than the hole diameter of the separation drum and the sand particles with a particle size smaller than the hole diameter of the separation drum, and a small part of the fluid flows down the filter mesh holes of the second screw with the sand particles with a particle size larger than the hole diameter of the separation drum. The downward flowing fluid also continuously flows outwardly under pressure. Finally, the fluid flows into the separation chamber, and all sand grains with the grain diameter larger than the hole diameter of the separation cylinder and small sand grains with the grain diameter smaller than the hole diameter of the separation cylinder fall into the sand outlet pipe.
The second spiral piece made of the filter screen has the following functions: firstly, sand grains sinking between each spiral surface or at the bottom of the cylinder are prevented from floating upwards, namely, the sand grains below each spiral surface cannot float upwards through the spiral surface, so that the sand grains cannot flow reversely and cannot be influenced by flushing of inlet fluid, and the separation efficiency of the sand grains is improved; secondly, part of the mixed liquor sinks along the spiral body, part of the mixed liquor fluid flows downwards from the holes of the filter screen, and the mixed liquor cannot directly fall to the lower part from the upper part of the separation cylinder and impact sand grains at the bottom of the cylinder, so that the sedimentation and separation effects are improved; thirdly, part of the mixed liquid sinks along the spiral body, so that the moving path of sand grains is increased, the longer the moving path is, the better the sand grain sedimentation effect is, so that sand grains with the grain diameter smaller than the pore diameter of the separation barrel can be precipitated at the bottom of the separation barrel, and the quantity of the sand grains entering the separation cavity is reduced; fourth, since the second flight is a screen structure, fluid flowing downward through the screen holes impinges on the sand between the flights, thereby increasing the sedimentation rate of the sand. The second spiral sheet made of the filter screen is arranged in the inner separating cylinder, and the filter screen structure of the inner separating cylinder is combined, so that all larger sand grains, a part of fine sand grains and finer sand grains in the sand-water mixed liquid sink into the bottom of the inner separating cylinder, the quantity of the fine sand grains and the finer sand grains entering into the separating cavity is reduced, the separating efficiency is improved, and meanwhile, the sand grains which have sunk into the bottom of the inner separating cylinder cannot be floated again, and the separating efficiency is improved again.
As a preferred example, a third screw 78 is provided in the separation chamber, the outer diameter of the third screw 78 being adapted to the inner diameter of the outer separation cylinder 73, the inner diameter of the third screw 78 being adapted to the outer diameter of the inner separation cylinder 76. The fluid entering the separation cavity moves downwards along the surface of the third spiral sheet to generate spiral movement, and the fluid continuously flows outwards under the action of pressure in the downwards moving process, so that the fluid does not directly move from top to bottom, thereby enabling sand grains to have sufficient sinking time, and simultaneously preventing the downward fluid from impacting the sand grains at the bottom of the separation cavity so as to ensure the separation effect. The third flight 78 has a pitch angle of 50 to 75. The selection of a larger helix angle facilitates the sand in the separation chamber to slide down the helicoid until it sinks to the bottom of the separation chamber.
Preferably, the third flight 78 is made of a screen, and the third flight has an aperture diameter of 2 to 5mm. After the mixed liquor flows into the separation chamber from the different heights of the separation cylinder 76, under a certain pressure, most of the fluid passes through the holes of the outer separation cylinder with sand particles with a particle size smaller than the hole diameter of the outer separation cylinder into the water tank, sand particles with a particle size larger than the hole diameter of the outer separation cylinder are trapped between the third spiral pieces by the outer separation cylinder, and a small part of the fluid slides downwards along the spiral surface of the third spiral pieces with sand particles with a particle size larger than the hole diameter of the outer separation cylinder and sand particles with a particle size smaller than the hole diameter of the outer separation cylinder, and a small part of the fluid flows downwards from the filter mesh holes of the third spiral pieces with sand particles with a particle size larger than the hole diameter of the outer separation cylinder and sand particles with a particle size smaller than the hole diameter of the outer separation cylinder. The downward flowing fluid also continuously flows outwardly under pressure. Finally, the fluid flows into the water tank, and all sand grains with the grain diameter larger than the hole diameter of the outer separating cylinder and a small part of sand grains with the grain diameter smaller than the hole diameter of the outer separating cylinder fall into the sand outlet pipe.
The third spiral sheet made of the filter screen has the following functions: firstly, sand grains sinking between each spiral surface or at the bottom of the cylinder are prevented from floating upwards, namely, the sand grains below each spiral surface cannot float upwards through the spiral surface, so that the sand grains cannot flow reversely, and the separation efficiency of the sand grains is improved; secondly, part of the mixed liquid sinks along the spiral body, part of the mixed liquid fluid flows downwards from the holes of the filter screen, and the mixed liquid cannot directly fall to the lower part from the upper part of the separation cavity and impact sand grains at the bottom of the separation cavity, so that the sedimentation and separation effects are improved; thirdly, part of the mixed liquid sinks along the spiral body, so that the moving path of sand grains is increased, the longer the moving path is, the better the sand grain sedimentation effect is, the sand grains with the grain diameter smaller than the hole diameter of the outer separation cylinder can also be precipitated at the bottom of the outer separation cylinder, and the quantity of the sand grains entering the water tank is reduced; fourth, since the third spiral sheet has a filter screen structure, fluid flowing downward from the holes of the filter screen impacts the sand between the spiral surfaces, thereby increasing the settling velocity of the sand.
As a preferable example, the diameter of the holes of the mesh structure of the inner separation cylinder 76 is 0.5mm or less, and the diameter of the holes of the mesh structure of the outer separation cylinder 73 is 0.25mm or less.
The inner separating cylinder is made of stainless steel, and the diameter of the hole is smaller than or equal to 0.5mm. The filter screen structure has the following functions: firstly, sand with the grain diameter larger than 0.5mm can be trapped in the inner separating cylinder, and the sand is sunk to the bottom of the cylinder body of the inner separating cylinder 76 under the action of gravity, so that the sand falls into a sand outlet pipe; second, because the screen holes are small, the fluid containing fine sand having a certain pressure in the separation cylinder 76 is sprayed from the holes into the separation chamber at a high speed, and the sand on the third screw 78 in the separation chamber is washed, so that the sedimentation of the fine sand in the separation chamber is accelerated.
The upper end of the screen structure of the outer separation cylinder 73 is lower than the lower end plane of the sedimentation tube 5, so that the high-speed fine fluid ejected from the screen holes is entirely acted on the liquid below the sedimentation tube. The filter screen structure of outer separating tube adopts stainless steel material, and aperture diameter less than or equal to 0.25mm, this filter screen structure has following effect: firstly, fine sand with the grain diameter larger than 0.25mm can be trapped in the separation cavity, and the fine sand is sunk into the bottom between the inner separation cylinder 76 and the outer separation cylinder 73 (namely the separation cavity) under the action of gravity, so that the fine sand falls into the sand outlet pipe; secondly, because the diameter of the holes of the filter screen is very small and very tight, high-pressure water flows are sprayed out from holes at different depth positions to the periphery at high speed to form circumferential fine water flows, the circumferential fine water flows enter the water tank, the sedimentation speed is increased simultaneously from different depths and different directions, the sedimentation effect is improved, and the fine water flows at different depths have small disturbance on mixed liquid in the water tank; thirdly, the falling fine water flow blocks the upward flowing liquid in the water tank from flowing, part of finer sand grains are contained in the upward floating liquid, the fine water flow continuously prevents the upward floating of the finer sand grains in the whole range, the fine water flow has wide coverage range, and more finer sand grains change the moving direction, so that the finer sand grains are continuously brought into the sand collecting tank 3, and the separation efficiency is improved; and fourthly, as the water in the water tank is distributed in multiple heights and multiple directions, downward flow in each height and each direction is effectively distributed, the water in the water tank is acted on at different depths, and after each sand descends the pitch of a filter screen, the sand is acted by downward force generated by fine high-speed fluid sprayed by the hole holes at the lower part, so that downward force is continuously generated on the sand, the acting force on the water is continuously improved at different depths, the impact of single concentrated water inlet on the water in the prior art is overcome, and the sedimentation speed of finer sand in fine water flow is increased. For sand grains which do accelerated falling and uniform falling, the sand grains are subjected to continuous downward force and accelerated falling; for sand grains in a suspended state, the sand grains move downwards after being subjected to continuous downward force; for sand grains in a floating state, after the sand grains are subjected to continuous downward force, the falling probability is increased; finally, the separation efficiency is improved; fifthly, after sedimentation through the sedimentation pipe 5, finer sand grains are gathered and then sink, and fine water sprayed from the separation cylinder is wrapped by the fine water so as to accelerate the sedimentation, thereby improving the separation efficiency.
The workflow of the spiral grit-water separator of the preferred embodiment described above is as follows:
the valve 9 is closed, the water pump is started at the same time, the sand-water mixed solution in the sedimentation tank generates certain pressure through the water pump, and the certain pressure is input into the first sand-water separation assembly 7 from the inlet 71 of the first sand-water separation assembly, so that certain pressure is formed in the first sand-water separation assembly 7. After the sand-water mixture enters the separating cylinder 76 from the inlet 71 and flows downwards to the second spiral sheet, a part of the mixture flows outwards under the action of pressure, a part of the mixture flows downwards along the spiral surface of the second spiral sheet, and a part of the mixture flows downwards from the filter mesh holes of the second spiral sheet. The wall of the filter screen of the inner separating cylinder carries out sand-water separation on the mixed liquid flowing outwards. Larger sand particles with a particle size of more than 0.5mm are trapped between the upper and lower spirals of the second spiral sheet by the separation cylinder, and most of the sand particles with a particle size of less than 0.5mm enter the separation chamber with the fluid passing through the perforations of the inner separation cylinder. The mixture flowing down the spiral face of the second flight and down the screen holes of the second flight moves down with the larger sand particles separated by the screen walls of the separation cartridge and part of the fine sand particles, finer sand particles, while continuously flowing outwardly under pressure. Finally, all larger sand grains with the grain size larger than 0.5mm and small and finer sand grains with the grain size smaller than 0.5mm sink to the bottom of the separating cylinder, and then fall into the sand outlet pipe. Thus, all the larger sand particles, a small part of the fine sand particles and the finer sand particles in the mixed liquid are trapped and precipitated into the sand outlet pipe, so that the mixed liquid entering the separation chamber only contains the fine sand particles and the finer sand particles.
After the mixed liquid enters the separation cavity from different heights of the separation cylinder, a part of the mixed liquid flows outwards under the action of pressure, a part of the mixed liquid flows downwards along the spiral surface of the third spiral sheet, and a part of the mixed liquid flows downwards from the filter screen holes of the third spiral sheet. The wall of the filter screen of the outer separating cylinder carries out sand-water separation on the mixed liquid flowing outwards. Fine sand particles with a particle size greater than 0.25mm are trapped between the upper and lower spirals of the third spiral sheet by the outer separator tube, and a majority of the finer sand particles with a particle size less than 0.25mm enter the water tank with the fluid passing through the perforations of the outer separator tube. The mixed liquor flowing downwards along the spiral surface of the third spiral sheet and downwards from the filter mesh holes of the third spiral sheet moves downwards with the fine sand grains and finer sand grains separated by the filter screen wall of the outer separation cylinder in the downward process, and simultaneously continuously flows outwards under the action of pressure. Eventually, all fine sand particles with a particle size greater than 0.25mm and a small portion of finer sand particles with a particle size less than 0.25mm sink to the bottom of the separation chamber and then fall into the sand outlet pipe. Thus, all the larger sand particles, all the fine sand particles and a small portion of the finer sand particles in the mixed liquor are trapped and precipitated into the sand outlet pipe, so that the mixed liquor entering the water tank contains only the finer sand particles.
The mixed liquid containing the residual finer sand grains is uniformly sprayed into the water tank from different heights of the outer separating cylinder to the periphery, so that downward water flow movement at each height and in each direction is smooth. When the supernatant fluid flows to the sedimentation pipe, the sedimentation pipe carries out further sedimentation on the supernatant fluid, the supernatant fluid separated by the sedimentation pipe flows out from the outlet 8 of the water tank 4, and the sedimented finer sand grains (sludge) move into the sand collecting tank 3 under the drive of fine high-speed water flow. At the same time, sand grains in the fluid in the water tank are also free to settle downwards under the action of gravity. Part of sand grains directly fall into the notch of the lower section of the sand collecting tank, part of sand grains fall onto the cover plate 31 of the upper section of the sand collecting tank, and slide down into the notch of the lower half section of the sand collecting tank along the cover plate. The driving piece 1 drives the first spiral piece 2 to rotate, the first spiral piece 2 drives sand grains in the sand collecting groove to move upwards from bottom to top, and when the sand grains run to the discharge hole 10, the sand grains fall into the sand containing container under the action of gravity.
In the first scheme, after a first preset period of time, the water pump is turned off, the valve 9 is opened, and sand grains in the sand outlet pipe 77 fall into the sand collecting tank under the combined action of atmospheric pressure and gravity. The driving piece 1 drives the first spiral piece 2 to rotate, the first spiral piece 2 drives sand grains in the sand collecting groove to move upwards from bottom to top, and when the sand grains run to the discharge hole 10, the sand grains fall into the sand containing container under the action of gravity. After a second preset period of time, the valve 9 is closed again, and the water pump is started at the same time, and the above procedure is repeated.
In the second scheme, after a first preset time period, the valve 9 is opened, most of the sand-water mixed liquid flows downwards to enter the sand outlet pipe with larger section size under the combined action of the pressure of the water pump and the gravity, and sand grains in the sand outlet pipe 77 are flushed into the sand collecting tank. The second driving piece 1 drives the first spiral piece 2 to rotate, the first spiral piece 2 drives sand grains and scum in the sand collecting groove to move upwards from below, and when the sand grains and scum run to the discharge hole 10, the sand grains and scum fall into the sand container under the action of gravity. After a second preset period of time, the valve 9 is closed again and the above procedure is repeated.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (8)

1. The spiral sand-water separator for municipal engineering is characterized by comprising a water tank (4) with an inclined inner bottom, a first sand-water separation component and a spiral sand-water separation component, wherein the first sand-water separation component is arranged in the water tank (4); the inlet of the first sand-water separation component is communicated with the inlet of the water tank, the outlet of the first sand-water separation component is communicated with the spiral sand-water separation component, and the spiral sand-water separation component is used for collecting sand particles separated by the first sand-water separation component and sand particles freely precipitated in the water tank and discharging the sand particles out of the water tank; the first sand-water separation assembly comprises an outer separation barrel (73) and an inner separation barrel (76) which are coaxially and vertically arranged, a separation cavity is formed between the outer separation barrel (73) and the inner separation barrel (76), and an annular sealing plate (72) for sealing the top end of the separation cavity is arranged at the top end of the outer separation barrel (73); the top end opening (71) of the inner separating cylinder (76) is an inlet of the first sand-water separation component, the bottom end openings of the outer separating cylinder (73) and the inner separating cylinder (76) are communicated with the top end opening of the sand outlet pipe (77), and the bottom end opening of the sand outlet pipe (77) is an outlet of the first sand-water separation component; the walls of the outer separating cylinder (73) and the inner separating cylinder (76) forming the separating cavity are both of filter screen structures, and a valve (9) is arranged at the lower part of the sand outlet pipe (77).
2. The spiral grit-water separator for municipal works according to claim 1, wherein the mesh diameter of the screen structure of said separation cylinder (76) is 0.5mm or less; the diameter of the holes of the filter screen structure of the outer separating cylinder (73) is less than or equal to 0.25mm.
3. The spiral sand-water separator for municipal works according to claim 1, wherein a central cylinder (75) is coaxially arranged in the inner separation cylinder (76), a second spiral sheet (74) is arranged between the central cylinder (75) and the inner separation cylinder (76), the outer diameter of the second spiral sheet (74) is matched with the inner diameter of the inner separation cylinder (76), and the inner diameter of the second spiral sheet (74) is matched with the outer diameter of the central cylinder (75); the second flight (74) has a helix angle of 50-75 degrees.
4. A spiral grit-water separator for municipal works according to claim 3, wherein the second spiral sheet (74) is made of a filter net and has an aperture diameter of 2 to 5mm.
5. The spiral sand-water separator for municipal works according to claim 1, wherein a third spiral sheet (78) is provided in the separation chamber, the outer diameter of the third spiral sheet (78) is adapted to the inner diameter of the outer separation cylinder (73), and the inner diameter of the third spiral sheet (78) is adapted to the outer diameter of the inner separation cylinder (76); the third flight (78) has a helix angle of 50-75 degrees.
6. The spiral grit-water separator for municipal works according to claim 5, wherein the third spiral sheet (78) is made of a filter net, and the diameter of the holes of the third spiral sheet is 2 to 5mm.
7. The spiral sand-water separator for municipal works according to claim 1, wherein the outlet (8) is provided at the upper part of the side wall of the water tank (4), the sedimentation pipe (5) is obliquely provided in the water tank, the sedimentation pipe (5) is positioned at the upper part in the water tank (4), and the upper end of the sedimentation pipe is lower than the lower end of the outlet (8).
8. The spiral sand-water separator for municipal works according to claim 1, wherein the second sand-water separation assembly comprises a sand collecting tank (3), a first spiral sheet (2) and a driving piece (1), wherein the sand collecting tank (3) is obliquely laid along the bottom of the water tank (4), and the higher end of the sand collecting tank (3) extends out of the water tank; the first spiral sheet (2) is arranged in the sand collecting groove (3), and one end of the first spiral sheet (2) is in transmission connection with the driving piece (1); the sand collecting tank (3) is of a U-shaped structure, and a cover plate (31) is arranged on a notch of the sand collecting tank (3) positioned at the upper middle part of the water tank (4); the outlet of the first sand-water separation component is communicated with the sand collecting groove (3).
CN202310298059.2A 2023-03-24 2023-03-24 Spiral sand-water separator for municipal engineering Withdrawn CN116474460A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310298059.2A CN116474460A (en) 2023-03-24 2023-03-24 Spiral sand-water separator for municipal engineering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310298059.2A CN116474460A (en) 2023-03-24 2023-03-24 Spiral sand-water separator for municipal engineering

Publications (1)

Publication Number Publication Date
CN116474460A true CN116474460A (en) 2023-07-25

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Application Number Title Priority Date Filing Date
CN202310298059.2A Withdrawn CN116474460A (en) 2023-03-24 2023-03-24 Spiral sand-water separator for municipal engineering

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Country Link
CN (1) CN116474460A (en)

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Application publication date: 20230725