CN114470892A - A kind of hydrocyclone backwash filter device and method - Google Patents

Abstract

The invention provides a hydraulic spiral-flow type backwashing filter device and a method, which comprise a filter main body and a backwashing component, wherein the filter main body is of a cylindrical barrel structure, a filter material is filled in the filter main body, the top opening is a sewage inlet, the top side wall is connected with a backwashing sewage pipe, the bottom of the filter main body is connected with a water collecting pipe, the bottom of the water collecting pipe is connected with a filtering clean water pipe, a water filtering plate is arranged at the joint of the filter main body and the water collecting pipe, water filtering holes are distributed on the water filtering plate, and a filter cap is correspondingly arranged on the water filtering plate; the back washing component comprises a plurality of rotational flow back washing water pipes and a vertical back washing water pipe, wherein the rotational flow back washing water pipes are uniformly arranged at intervals along the circumferential surface of the lower part of the filtering main body, the rotational flow back washing water pipes are tangent to the outer edge of the filtering main body in the radial direction, and the vertical back washing water pipe is arranged on the side wall of the water collecting pipe.

Description

A kind of hydraulic cyclone backwash filter device and method

technical field

The invention belongs to the technical field of sewage filtration and purification, and in particular relates to a hydrocyclone backwashing filtration device and method.

Background technique

The filter device used by the waterworks to filter the river sewage mainly uses quartz sand as the filter material. With the filtering of sewage for a period of time, a large amount of impurities are generated between the voids of the quartz sand to block the voids, and the filtering effect is greatly reduced, so that the filter device needs to be backwashed after working for a period of time, that is, the bottom-up water flow is used to remove the The filter material is expanded and washed to flush out the impurities retained by the filter material, so that the filter material can restore the filtering effect.

However, although this bottom-up water flow can separate the impurity particles, the large impurities can still float on the upper surface of the filter material and cannot be washed out with the water flow, which will affect the filtration effect of the subsequent filter material, and this kind of backwashing The water consumption of the filter media is high, and the filter media cannot be completely cleaned effectively.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a hydraulic cyclone backwashing filtering device and method in view of the above-mentioned problems. The cyclone principle adopted can greatly improve the backwashing efficiency.

The technical solution adopted by the present invention to solve the above technical problems is: a hydraulic cyclone backwash filter device, which is characterized in that it includes a filter body and a backwash assembly, the filter body is a cylindrical structure, and the interior is filled with filter materials , the top opening is the sewage inlet, the top side wall is connected to the backwash sewage pipe, the bottom is connected to the water collection pipe, the bottom of the water collection pipe is connected to the filtered clean water pipe, and the connection between the filter main body and the water collection pipe is provided with a water filter plate, the water filter plate A water filter hole is arranged on the upper part, and a filter cap is correspondingly installed in the water filter hole; The surfaces are evenly spaced, a plurality of swirling backwashing water pipes are radially tangent to the outer edge of the filter body, and the vertical backwashing water pipes are arranged on the sidewall of the water collecting pipe.

According to the above scheme, the upper part of the filter body is provided with a water collecting tank, and the water collecting tank is a cylindrical groove structure with an opening at the top and a connecting hole in the center of the bottom plate. The water tank is sleeved on the filter main body, and is connected and fastened with the outer wall of the filter main body, and the backwash sewage pipe is communicated with the outer wall of the water collecting tank.

According to the above scheme, the cyclone backwash water pipe, the vertical backwash water pipe and the filtered clean water pipe are all provided with one-way valves.

According to the above solution, the water collecting pipe is of a conical cylinder structure, the diameter of the large opening is the same as the diameter of the filter main body, and the diameter of the small opening is the same as the diameter of the filtering water pipe.

According to the above solution, the height of the top opening of the water collection tank is greater than the top opening of the filter body, and the nozzle of the backwash sewage pipe is flush with the bottom plate of the water collection tank.

A hydraulic cyclone backwash filtration method, characterized in that, comprising the following steps:

S1) Sewage filtration: The sewage to be filtered enters the filter body from the sewage inlet, and the impurity particles and suspended solids in the sewage are trapped in the filter material layer through the interception effect of the filter material, and finally filtered clean water is discharged from the filter clean water pipe to obtain filtered water. of clean water;

S2) Backwashing: Close the one-way valve of the filtered clean water pipe, open the one-way valve of the swirl backwashing water pipe and the vertical backwashing water pipe, and flow the tap water from the swirl backwashing water pipe and the vertical backwashing water pipe into the filter body, The filter material is swirled and expanded, and the impurity particles attached to the surface of the filter material and the gap between the filter materials are washed down by the collision between the filter materials. Flush the sewer to drain.

The beneficial effects of the present invention are: to provide a hydraulic cyclone backwashing filtering device and method, adding a plurality of backwashing water pipes in the tangential direction on the peripheral surface of the filter body, and converting the vertical upward backwashing water flow direction into the following The direction of the water flow tangentially around the cylindrical swirling flow can make the interaction between the filter materials more intense, enhance the friction between the filter materials, and can more effectively clean the impurity particles between the filter materials. The cleaning efficiency is improved; at the same time, the intermediate impurity particles can be better discharged out of the filter device by the swirling effect, so as to achieve a better cleaning effect.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

FIG. 2 is an effect diagram of water turbidity after backwashing under different backwashing water flow directions according to an embodiment of the present invention.

Detailed ways

For a better understanding of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in Figure 1, a hydrocyclone backwash filter device includes a filter body 1 and a backwash assembly. The filter body is a cylindrical structure, filled with filter material, the top opening is a sewage inlet 2, and the top side wall is connected The backwash sewage pipe 3 is connected to the water collection pipe 4 at the bottom, and the filtered clean water pipe 5 is connected to the bottom of the water collection pipe. The connection between the filter main body and the water collection pipe is provided with a water filter plate 6. A filter cap is installed; the backwashing assembly includes a swirl backwashing water pipe 8 and a vertical backwashing water pipe 9. There are multiple swirl backwashing water pipes, which are evenly spaced along the lower peripheral surface of the filter body. Both upwards are tangent to the outer edge of the filter body, and the vertical backwash water pipe is arranged on the side wall of the water collecting pipe.

The upper part of the filter body is provided with a water collecting tank 10. The water collecting tank is a cylindrical groove structure with an opening at the top and a connecting hole in the center of the bottom plate. The diameter of the connecting hole is the same as the outer diameter of the filtering body. Fasten, the backwash sewage pipe is communicated with the outer wall of the sump.

There are one-way valves on the swirl backwash water pipe, vertical backwash water pipe and filtered clean water pipe, and the opening and closing of the one-way valve controls the on-off of the pipeline.

The water collecting pipe is a conical cylinder structure, the diameter of the large mouth is the same as the diameter of the filter body, and the diameter of the small mouth is the same as the diameter of the filter water pipe. By setting the water collection pipe, a filter plate with a larger area can be installed, so that a plurality of filter caps can be arranged on it to increase the filtering efficiency.

According to the above solution, the height of the top opening of the water collection tank is greater than the top opening of the filter body, and the nozzle of the backwash sewage pipe is flush with the bottom plate of the water collection tank.

The method for filtering sewage by using the above-mentioned hydrocyclone backwashing filter device comprises the following steps:

(1) Sewage filtration: The sewage to be filtered enters the filter body from the sewage inlet, and the impurity particles and suspended solids in the sewage are trapped in the filter material layer by the interception effect of the filter material, and finally the filtered clean water is discharged from the filtered clean water pipe to obtain Filtered water.

(2) Backwashing: Close the one-way valve of the filtered clean water pipe, open the one-way valve of the swirl backwashing water pipe and the vertical backwashing water pipe, and flow the tap water from the swirl backwashing water pipe and the vertical backwashing water pipe into the filter body , the filter material is swirled and expanded, and the impurity particles attached to the surface of the filter material and the gap between the filter materials are washed down by the collision between the filter materials, and the impurity particles floating on the upper layer of the filter material are removed from Backwash the sewage pipe to discharge.

Example 1

The diameter of the sewage inlet of the filter main body is 250mm and the length is 1500mm. The diameter of the upper horizontal backwash sewage pipe is 200mm, and the diameter of the filtered clean water pipe is 75mm. A layer of clapboard is placed under the filter body, and seven filter caps are placed in the middle of the clapboard.

After the same filtration experiment was carried out on the filtration device, under the same water flow intensity, the water turbidity effect after backwashing under different backwashing water flow directions (vertical backwashing water flow and swirling backwashing water flow) was compared (see Figure 2) , it was found that the backwashing effect of the swirl water flow was significantly better than that of the vertical water flow. The water turbidity of the swirling water flow could reach 1 NTU after five minutes of backwashing, while the water turbidity of the vertical water flow could reach 1 NTU after fifteen minutes. effect, greatly improving the efficiency of backwashing.

The accompanying drawings describe the embodiments of the present invention, but the present invention is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only schematic, not restrictive, and those of ordinary skill in the art are familiar with the present invention. Under the inspiration of the present invention, many forms can be made without departing from the scope of protection of the present invention and the claims, which all belong to the protection of the present invention.

Claims (6)

1. A hydraulic spiral-flow type backwashing filter device is characterized by comprising a filter main body and a backwashing component, wherein the filter main body is of a cylindrical barrel structure, a filter material is filled in the filter main body, the top opening is a sewage inlet, the top side wall is connected with a backwashing sewage pipe, the bottom of the filter main body is connected with a water collecting pipe, the bottom of the water collecting pipe is connected with a filtering clean water pipe, a water filtering plate is arranged at the joint of the filter main body and the water collecting pipe, water filtering holes are distributed in the water filtering plate, and a filter cap is correspondingly arranged in the water filtering holes; the back washing assembly comprises a plurality of rotational flow back washing water pipes and a plurality of vertical back washing water pipes, the rotational flow back washing water pipes are uniformly arranged along the circumferential surface of the lower part of the filtering main body at intervals, the rotational flow back washing water pipes are tangent to the outer edge of the filtering main body in the radial direction, and the vertical back washing water pipes are arranged on the side wall of the water collecting pipe.

2. The air water collecting device of claim 1, wherein the filtering body is provided with a water collecting tank at an upper portion thereof, the water collecting tank is a cylindrical tank structure having an open top and a connecting hole at a center of the bottom plate, the connecting hole has a diameter equal to an outer diameter of the filtering body, the water collecting tank is sleeved on the filtering body and is fastened to an outer wall of the filtering body, and the backwashing sewer pipe is communicated with the outer wall of the water collecting tank.

3. An air water collecting device according to claim 2, wherein the cyclone back-flushing water pipe, the vertical back-flushing water pipe and the filtered clean water pipe are provided with one-way valves.

4. An air water collecting device according to claim 1, 2 or 3, wherein said water collecting pipe is a conical cylinder structure, the diameter of the large mouth is the same as the diameter of said filtering main body, and the diameter of the small mouth is the same as the diameter of said filtering clean water pipe.

5. An air collection unit according to claim 2 or 3, wherein the height of the top opening of the water collection sump is greater than the height of the top opening of the filter body, and the mouth of the backwash sewage pipe is flush with the floor of the water collection sump.

6. A hydraulic cyclone type backwashing filtering method is characterized by comprising the following steps:

s1) sewage filtration: sewage to be filtered enters the filtering main body from the sewage inlet, impurity particles and suspended matters in the sewage are intercepted in the filtering material layer through the interception effect of the filtering material, and finally filtered clear water is discharged from the filtering clear water pipe to obtain filtered clear water;

s2) backwashing: closing the one-way valve of the filtering clean water pipe, opening the one-way valves of the rotational flow back washing water pipe and the vertical back washing water pipe, making the tap water flow into the filtering main body from the rotational flow back washing water pipe and the vertical back washing water pipe, performing rotational flow expansion on the filtering materials, washing off impurity particles attached to the surface of the filtering materials and gaps among the filtering materials by utilizing collision among the filtering materials, and discharging the impurity particles floating on the upper layer of the filtering materials from the back washing sewage pipe by utilizing the rotational flow effect.

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