A spiral sand-water separator

Abstract

A spiral sand-water separator includes a sedimentation tank for sedimentation and separation of sand and water, and a spiral conveyor device inclined in the sedimentation tank. It also includes a liquid inlet device for conveying sand-water to the sedimentation tank and a cyclone grit chamber for secondary separation of the supernatant discharged from the sedimentation tank. The liquid inlet device includes a liquid inlet pipe for conveying sand-water and a liquid inlet tank disposed in the sedimentation tank and connected to the liquid inlet pipe. A sewage discharge port connected to the liquid inlet tank is provided at the bottom of the cyclone grit chamber. Through the cooperation of the sedimentation tank and the cyclone grit chamber, the sand-water is separated multiple times to ensure the separation quality.

Description

Technical Field

[0001] The present invention relates to the technical field of sand-water separation, and particularly to a transition liquid inlet box of a spiral sand-water separator. Background Art

[0002] A spiral sand-water separator is a special sewage treatment equipment for separating sand and water in the sewage treatment process. The function of the spiral sand-water separator is to separate sand from the sand-water mixture. At present, the sand-water mixture is generally pumped by a water pump and sent into the spiral sand-water separator through a pipeline pump. The incoming liquid will collide with the surface of the sewage retained in the sedimentation area of the spiral sand-water separator. Since the incoming liquid pressure is relatively large and it directly enters the spiral sand-water separator, it often generates a large splash, causing secondary pollution at the site. The pumped sand-water mixture directly enters the sand sedimentation area of the spiral sand-water separator. Due to the relatively large incoming liquid pressure, the flow of the sand and water body in the sedimentation area is violent, which is not conducive to the settlement of sand grains. Even the sand grains that have already settled will be washed up by the water flow and suspended in the water, greatly affecting the separation quality and efficiency. During the pumping process of the sand-water mixture, the wear of the pipeline elbow by the sand is relatively severe, greatly reducing the effective service life of the pipeline, and there is a need for improvement. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a spiral sand-water separator.

[0004] The present invention adopts the following technical solutions:

[0005] A spiral sand-water separator includes a sedimentation tank for sand-water precipitation separation and a spiral conveying device inclined in the sedimentation tank. It also includes a liquid inlet device for conveying sand-water to the sedimentation tank and a cyclone sand settler for secondary separation of the supernatant discharged from the sedimentation tank. The liquid inlet device includes a liquid inlet pipe for conveying sand-water and a liquid inlet box disposed in the sedimentation tank and connected to the liquid inlet pipe. A sewage discharge port connected to the liquid inlet box is provided at the bottom of the cyclone sand settler. The liquid inlet box includes a vertical section and an inclined section. The upper end of the vertical section is connected to the top of the sedimentation tank, and the lower end extends downward into the sedimentation tank; the inclined section is inclinedly connected to the lower end of the vertical section, and a water outlet is provided on the side of the inclined section facing away from the sedimentation area of the sedimentation tank. The highest point of the water outlet is higher than the highest liquid level of the sand-water retained in the sedimentation tank, and the lowest point of the water outlet is lower than the lowest liquid level of the sand-water retained in the sedimentation tank.

[0006] Preferably, the liquid inlet device further includes a flow dividing member disposed in the liquid inlet box and connected to the liquid inlet pipe, and the flow dividing member is located in the vertical section.

[0007] Preferably, the flow splitter includes a liquid inlet interface and an arc-shaped pipe. The liquid inlet interface is arranged at the top of the liquid inlet tank and connected to the liquid inlet pipe. The arc-shaped pipe is arranged at the lower end of the liquid inlet interface and includes a pipe body, a water inlet arranged at the top of the pipe body and connected to the liquid inlet interface, and two drain outlets symmetrically arranged at both ends of the pipe body and opposite to the inclined section.

[0008] Preferably, the diameter of the liquid inlet pipe is smaller than the diameter of the liquid inlet interface.

[0009] Preferably, the liquid inlet interface is directly opposite to the central axis of the liquid inlet tank.

[0010] Preferably, it further includes a transition tank, a drainage pipe, and a supernatant liquid conveying assembly. The transition tank is used to store the supernatant liquid discharged from the sedimentation tank. The drainage pipe is arranged between the transition tank and the sedimentation tank. The supernatant liquid conveying assembly is arranged between the transition tank and the hydrocyclone to send the supernatant liquid into the hydrocyclone for secondary separation.

[0011] Preferably, an overflow port is arranged on one side of the sedimentation tank facing away from the water outlet. The drainage pipe is connected to the overflow port. The lowest part of the overflow port is flush with the lowest liquid level of the sand and water retained in the sedimentation tank, and the highest part of the overflow port is higher than the highest liquid level of the sand and water retained in the sedimentation tank.

[0012] Preferably, the supernatant liquid conveying assembly includes a conveying pump arranged at the bottom of the transition tank and a conveying pipe with one end connected to the conveying pump and the other end connected to the hydrocyclone.

[0013] Preferably, the screw conveyor includes screw blades arranged in the sedimentation tank, and the lowest part of the water outlet is slightly higher than the upper end surface of the opposite screw blade.

[0014] Preferably, the screw blades are inclined upward to the right and arranged in the sedimentation tank, and the inclined section is inclined downward to the right at the lower end of the vertical section.

[0015] As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are as follows: During operation, the sand and water flow into the sedimentation tank through the liquid inlet device for sedimentation. The sedimented sand and gravel are transported out of the device through the screw conveyor. The supernatant liquid enters the hydrocyclone for secondary separation. The sand and gravel obtained from the secondary separation re-enter the sedimentation tank through the liquid inlet tank for sedimentation. Through the cooperation of the sedimentation tank and the hydrocyclone, the sand and water are separated multiple times to ensure the separation quality;

[0016] The liquid inlet device includes a liquid inlet tank. An outlet is provided on one side of the liquid inlet tank facing away from the sedimentation area. When the sand and water enter the sedimentation tank from the liquid inlet tank, they flow into the sedimentation tank from the outlet after being buffered by the inclined section, slowing down the water flow and preventing the liquid from directly impacting the sedimentation area, ensuring the sedimentation effect. The lowest point of the outlet is always lower than the lowest point of the liquid level in the sedimentation tank, ensuring that the sand and water can enter the spiral sand-water separator without a drop, eliminating the impact of the drop. And the highest point of the outlet is always higher than the highest point of the liquid level in the sedimentation tank during the working process, enabling the gas in the pipeline to be quickly released and replenished at any time during the pumping process and after the pump stops, which is beneficial to the transportation of the sand-water mixture and the emptying of the pipeline.

[0017] The sand and water flow into the liquid inlet box after flowing into the shunt part from the liquid inlet pipe. The flow rate of the sand and water is shunted by the shunt part, achieving the effect of slowing down the impact force of the water flow.

[0018] Drain outlets are respectively provided at both ends of the arc-shaped pipe. The sand and water enter from the water inlet of the arc-shaped pipe and flow out from the drain outlets at both ends after being blocked by the bottom of the arc-shaped pipe, achieving the effect of shunting and reducing pressure while reducing the impact force of the water flow on the inclined section.

[0019] The diameter of the liquid inlet pipe is smaller than the diameter of the liquid inlet interface, facilitating the free change of direction of the inclined liquid inlet pipe and the vertical liquid inlet interface for docking. And when the water flow enters from the small pipe and flows out from the large pipe, the water flow in the central part still maintains a relatively high speed and low pressure, while the water flow at the edge is under higher water pressure due to being in a relatively static state and will flow towards the middle to form a backflow, greatly weakening the impact force of the water flow in the water inlet pipe.

[0020] The liquid inlet interface is directly opposite to the central axis of the liquid inlet box, that is, the arc-shaped pipe is symmetrically arranged along the central axis of the liquid inlet box, so that the impacts generated during liquid inlet cancel each other out, reducing the shaking and vibration of the spiral sand-water separator, making it easier to ensure the balance and stable operation of the spiral sand-water separator.

[0021] The overflow port is arranged at a position opposite to the position of the outlet of the liquid inlet tank, which can effectively prevent the sand and water from flowing out directly from the overflow port without sedimentation after flowing out from the outlet. The lowest point of the overflow port is flush with the lowest liquid level of the sand and water retained in the sedimentation tank, and the highest point of the overflow port is higher than the highest liquid level of the sand and water retained in the sedimentation tank. When the liquid level in the sedimentation tank is higher than the overflow port, the supernatant liquid after sedimentation can flow out from the overflow port to start secondary separation, ensuring the smooth operation of the device.

[0022] The lowest point of the outlet is slightly higher than the upper end surface of the relative spiral blade, preventing the spiral conveying device from touching the outlet during operation and causing damage to the device.

[0023] The inclined section is inclined downward to the right, while the spiral blade is inclined upward to the right, with opposite directions, greatly reducing the impact of the water flow on the sand and water retained in the sand sedimentation area on the left, facilitating the sedimentation and separation of the sand and gravel. Description of the Drawings

[0024] Figure 1 is the structural schematic diagram of the present invention;

[0025] Figure 2 is Figure 1 the partial schematic diagram at position A in

[0026] Figure 3 is the structural schematic diagram of the flow splitter of the present invention;

[0027] In the figure: 1 - sedimentation tank, 11 - sedimentation area, 2 - screw conveyor, 21 - screw blade, 3 - liquid inlet device, 31 - liquid inlet pipe, 311 - transition liquid storage bag, 32 - liquid inlet tank, 321 - vertical section, 322 - inclined section, 323 - water outlet, 33 - flow splitter, 331 - liquid inlet interface, 332 - arc-shaped pipe, 3321 - pipe body, 3322 - water inlet, 3323 - drain port, 4 - cyclone sand separator, 41 - water outlet pipe, 42 - sewage discharge port, 5 - transition tank, 6 - diversion pipe, 61 - overflow port, 7 - supernatant liquid conveying assembly, 71 - conveying pump, 72 - conveying pipe, 8 - highest liquid level, 9 - lowest liquid level. Specific embodiments

[0028] The present invention will be further described below through specific embodiments.

[0029] Referring to Figures 1 to 3 as shown, a spiral sand-water separator includes a sedimentation tank 1, a screw conveyor 2, a liquid inlet device 3, a cyclone sand separator 4, a transition tank 5, a diversion pipe 6 and a supernatant liquid conveying assembly 7.

[0030] The sedimentation tank 1 allows the incoming sand and water to settle statically. The sedimentation tank 1 is inclined, and its lowest part forms a sand and water sedimentation area 11. Specifically, the cross-section of the sedimentation tank 1 is U-shaped.

[0031] The screw conveyor 2 is inclined upward to the right in the sedimentation tank 1. The sand and water enter the sedimentation tank 1 for sedimentation, and the precipitated sand and gravel are transported out of the device through the screw conveyor 2. Specifically, the screw conveyor 2 includes screw blades 21 arranged in the sedimentation tank 1. The screw conveyor 2 is a commonly used transmission component in the spiral separator, and its specific structure will not be further elaborated here.

[0032] The liquid inlet device 3 is connected to the sedimentation tank 1 and includes a liquid inlet pipe 31 for transporting sand and water, a liquid inlet tank 32 arranged in the sedimentation tank 1 and connected to the liquid inlet pipe 31, and a flow splitter 33 arranged in the liquid inlet tank 32 and connected to the liquid inlet pipe 31.

[0033] The liquid inlet tank 32 includes a vertical section 321 and an inclined section 322. The upper end of the vertical section 321 is connected to the top of the sedimentation tank 1, and the lower end extends downward into the sedimentation tank 1. The inclined section 322 is inclinedly connected to the lower end of the vertical section 321. Specifically, the inclined section 322 is inclined downward to the right and is arranged at the lower end of the vertical section 321. An outlet 323 is provided on the side of the inclined section 322 facing away from the sedimentation area 11 of the sedimentation tank 1. The sand and water flow into the inlet tank and then flow into the sedimentation tank 1 from the outlet 323 after being buffered by the inclined section 322, greatly reducing the impact of the water flow on the sand and water remaining in the sand sedimentation area on the left side, which is beneficial to the sedimentation and separation of the sand and gravel. The inclined direction of the inclined section 322 is opposite to the inclined direction of the screw conveyor 2, greatly reducing the impact of the water flow on the sand and water remaining in the sand sedimentation area on the left side, which is beneficial to the sedimentation and separation of the sand and gravel. Further, the highest point of the outlet 323 is higher than the highest liquid level 8 of the sand and water remaining in the sedimentation tank 1, so that the gas in the pipeline can be quickly released and replenished in time during the pumping process and after the pump stops, which is beneficial to the transportation of the sand and water mixture and the emptying of the pipeline; the lowest point of the outlet 323 is lower than the lowest liquid level 9 of the sand and water remaining in the sedimentation tank 1, ensuring that the sand and water can enter the spiral sand water separator without a drop, eliminating the impact of the drop; the lowest part of the outlet 323 is slightly higher than the upper end face of the relative spiral blade 21, preventing the screw conveyor 2 from touching the outlet 323 during operation and causing damage to the device.

[0034] The flow dividing member 33 is located in the vertical section 321 and includes a liquid inlet interface 331 and an arc-shaped pipe 332 opposite to the bottom surface of the inclined section 322. The liquid inlet interface 331 is arranged at the top of the liquid inlet tank 32 and is connected to the liquid inlet pipe 31; the arc-shaped pipe 332 is arranged at the lower end of the liquid inlet interface 331 and includes a pipe body 3321, a water inlet 3322 arranged at the top of the pipe body 3321 and connected to the liquid inlet interface 331, and two drain ports 3323 symmetrically arranged at both ends of the pipe body 3321 and opposite to the inclined section 322. The sand and water enter the arc-shaped pipe 332 from the liquid inlet interface 331 and flow out from the drain ports 3323 at both ends of the arc-shaped pipe 332 after being blocked by the top of the pipe body 3321, achieving the effects of flow division and pressure reduction while reducing the impact force of the water flow. Specifically, the liquid inlet interface 331 is directly opposite to the central axis of the liquid inlet tank 32, and the arc-shaped pipe 332 is symmetrically arranged along the central axis of the liquid inlet tank 32, so that the impacts generated during liquid inlet cancel each other out, reducing the shaking and vibration of the spiral sand water separator and making it easier to ensure the balance and stable operation of the spiral sand water separator.

[0035] One end of the liquid inlet pipe 31 is connected to an external sand water source, and the other end is connected to the liquid inlet interface 331, sending the external sand water source into the sedimentation tank 1 for sedimentation. Specifically, the diameter of the liquid inlet pipe 31 is smaller than that of the liquid inlet interface 331, facilitating the free change of direction for the inclined liquid inlet pipe 31 and the vertical liquid inlet interface 331 to be docked. And when the water flows from the small pipe into the large pipe and outflows, the water pressure in the central part is relatively small, and the water flow at the edge is in a relatively static state, so the water pressure is relatively high and will flow towards the middle to form a backflow, greatly weakening the water flow impact force of the water inlet pipe. Further, the liquid inlet pipe 31 is composed of multiple sections of pipes. When the connection between pipes is non-linear, transition liquid storage bags 311 are provided at the turning points of the pipes. Using the coagulation layer formed in the transition liquid storage bags 311, the sand in the sand water does not directly scour the pipe wall at the turning point, playing an isolation and protection role for the pipe wall at the turning point and ensuring the effective service life of the pipeline.

[0036] The cyclone sand separator 4 is arranged on the liquid inlet tank 32, with a water outlet pipe 41 connected to the top and a sewage outlet 42 connected to the liquid inlet tank 32 at the bottom. The supernatant is transported to the cyclone sand separator 4 for secondary separation. The water after secondary separation is transported out of the device through the water outlet pipe 41, and the sand and gravel are transported back into the sedimentation tank 1 through the sewage outlet 42 to achieve a better sand water separation effect.

[0037] The transition tank 5 is used to store the supernatant discharged from the sedimentation tank 1.

[0038] The diversion pipe 6 is arranged between the transition tank 5 and the sedimentation tank 1, diverting the supernatant after sedimentation in the sedimentation tank 1 to the transition tank 5 for temporary storage. Specifically, an overflow port 61 is arranged on one side of the sedimentation tank 1 facing away from the water outlet 323. The overflow port 61 can effectively prevent the sand water from flowing out directly from the overflow port 61 without sedimentation after flowing out from the water outlet 323. The diversion pipe 6 is connected to the overflow port 61. The lowest point of the overflow port 61 is at the same level as the lowest liquid level 9 of the sand water retained in the sedimentation tank 1, and the highest point of the overflow port 61 is higher than the highest liquid level 8 of the sand water retained in the sedimentation tank 1. When the liquid level in the sedimentation tank 1 is higher than the overflow port 61, the supernatant can flow out from the overflow port 61 to start secondary separation, ensuring the smooth operation of the device.

[0039] The supernatant transportation assembly 7 is arranged between the transition tank 5 and the cyclone sand separator 4, including a transportation pump 71 arranged in the transition tank 5 and a transportation pipe 72 with one end connected to the transportation pump 71 and the other end connected to the cyclone sand separator 4.

[0040] During operation, the sand water flows into the sedimentation tank 1 through the liquid inlet device 3 for sedimentation. The sedimented sand and gravel are transported out of the device through the screw conveyor. The supernatant enters the cyclone sand separator 4 through the supernatant transportation assembly 7 for secondary separation. The sand and gravel obtained from the secondary separation re-enter the sedimentation tank 1 through the liquid inlet tank 32 for sedimentation. Through the cooperation of the sedimentation tank 1 and the cyclone sand separator 4, the sand water is separated multiple times to ensure the separation quality.

[0041] As described above, it is only the preferred embodiment of the present invention, and thus the scope of implementation of the present invention cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the specification should still fall within the scope covered by the patent of the present invention.

Claims

1. A spiral sand-water separator, comprising a sedimentation tank for sedimentation and separation of sand and water, and a spiral conveying device inclined and arranged in the sedimentation tank, characterized in that: It further includes a liquid inlet device for conveying sand-water to the sedimentation tank and a hydrocyclone for secondary separation of the supernatant discharged from the sedimentation tank. The liquid inlet device includes a liquid inlet pipe for conveying sand-water and a liquid inlet box disposed in the sedimentation tank and connected to the liquid inlet pipe. A sewage discharge port connected to the liquid inlet box is provided at the bottom of the hydrocyclone. The liquid inlet box includes a vertical section and an inclined section. The upper end of the vertical section is connected to the top of the sedimentation tank, and the lower end extends downward into the sedimentation tank; the inclined section is obliquely connected to the lower end of the vertical section, and a water outlet is provided on the side of the inclined section facing away from the sedimentation area of the sedimentation tank. The highest point of the water outlet is higher than the highest liquid level of the sand-water retained in the sedimentation tank, and the lowest point of the water outlet is lower than the lowest liquid level of the sand-water retained in the sedimentation tank; the liquid inlet device further includes a flow dividing member disposed in the liquid inlet box and connected to the liquid inlet pipe, and the flow dividing member is located in the vertical section; it further includes a transition tank, a drainage pipe, and a supernatant conveying assembly. The transition tank is used for storing the supernatant discharged from the sedimentation tank; the drainage pipe is disposed between the transition tank and the sedimentation tank; the supernatant conveying assembly is disposed between the transition tank and the hydrocyclone to send the supernatant into the hydrocyclone for secondary separation; an overflow port is provided on the side of the sedimentation tank facing away from the water outlet, the drainage pipe is connected to the overflow port, the lowest part of the overflow port is flush with the lowest liquid level of the sand-water retained in the sedimentation tank, and the highest part of the overflow port is higher than the highest liquid level of the sand-water retained in the sedimentation tank.

2. The spiral sand-water separator according to claim 1, characterized in that: The flow dividing member includes a liquid inlet interface and an arc-shaped pipe. The liquid inlet interface is disposed at the top of the liquid inlet box and connected to the liquid inlet pipe; the arc-shaped pipe is disposed at the lower end of the liquid inlet interface and includes a pipe body, a water inlet disposed at the top of the pipe body and connected to the liquid inlet interface, and two drain ports symmetrically disposed at both ends of the pipe body and opposite to the inclined section.

3. A spiral sand-water separator according to claim 2, characterized in that: The diameter of the liquid inlet pipe is smaller than the diameter of the liquid inlet interface.

4. A spiral sand-water separator according to claim 1, characterized in that: The supernatant conveying assembly includes a conveying pump disposed at the bottom of the transition tank and a conveying pipe with one end connected to the conveying pump and the other end connected to the hydrocyclone.

5. A spiral sand-water separator according to claim 1, characterized in that: The screw conveying device includes screw blades disposed in the sedimentation tank, and the lowest part of the water outlet is slightly higher than the upper end surface of the opposite screw blade.

6. The spiral sand-water separator according to claim 5, wherein: The screw blades are obliquely arranged upward to the right in the sedimentation tank, and the inclined section is obliquely arranged downward to the right at the lower end of the vertical section.

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