CN215310423U - Air-washing type sand filter backwashing device - Google Patents
Air-washing type sand filter backwashing device Download PDFInfo
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- CN215310423U CN215310423U CN202120662741.1U CN202120662741U CN215310423U CN 215310423 U CN215310423 U CN 215310423U CN 202120662741 U CN202120662741 U CN 202120662741U CN 215310423 U CN215310423 U CN 215310423U
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Abstract
The utility model discloses a backwashing device of a gas washing type sand filter, which comprises a filter tank body, wherein a sand filtering layer is arranged in the filter tank body, a sewage inlet pipeline is arranged in the filter tank body, a water outlet at the bottom of the sewage inlet pipeline is connected with a water distributor, the water outlet end of the water distributor is positioned below the sand filtering layer and is communicated with the bottom space, and the sewage inlet pipeline is connected to a sewage water storage tank; a clear water overflow port is arranged on the side wall of the upper space of the filter tank body, the clear water overflow port is connected with a clear water storage tank through a pipeline, and a backwash water supply port at the bottom of the clear water storage tank is communicated to the bottom space of the filter tank body through a return pipeline; the aeration disc is arranged on the inner wall of the filter pool body, and when backwashing is needed, the aeration disc is aerated, so that sand grains in the sand filtering layer are enabled to move, the sand grains rub against each other during movement, flocculent dirt attached to the sand grains is peeled off, and the dirt is brought to the upper space of the filter pool body along with the upward flowing of backwashing water and is discharged from the backwashing water outlet.
Description
Technical Field
The utility model belongs to the technical field of sand filter devices, and particularly relates to an air-washing type sand filter backwashing device.
Background
The sand filter tank filtering process is a filtering device based on the countercurrent principle, has the advantages of small occupied area, low cost and the like, is widely applied to water purification treatment, and simultaneously has an open type and a closed type due to factors such as fields, water purification facilities and the like, wherein raw water in the closed type sand filter tank enters the filter from top to bottom through a water inlet pipe, is uniformly distributed by a water distributor and then flows upwards, the filtering is completed through a filter material layer, and the water is gathered at the upper part of the filter tank and is discharged to a clean water tank through an overflow weir. In the process, water is filtered by the sand filter material, the content of pollutants in the water is reduced, the content of pollutants in the sand filter material is increased, and the content of pollutants in the lower filter material layer is higher than that of the upper filter material layer.
After long-time operation, part of pollutants such as floc or precipitated particles are accumulated in each stage of filter material, sand filter material hardening is formed after excessive accumulation, interference is generated on the normal filtering process, and the quality of effluent water of the sand filter tank body is further influenced. Therefore, after the closed sand filter tank is operated for 6-12 hours, the sand filter tank is required to be cleaned from floc or precipitated particles accumulated in the sand filter tank, and the traditional method is a siphon method which is required to use the outlet water of the filter tank to backwash the sand filter material in the tank body by using the siphon principle. This backwash process influences the filtering pond and goes out the water yield, and the backwash is thorough inadequately simultaneously when quality of water is relatively poor, especially when the production task is heavier, and abluent time and number of times can not obtain abundant assurance, changes the husky filter plate that takes place to lead to by the backwash inadequately and ties the condition.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a backwashing device of an air-washing sand filter.
The utility model is realized by the following technical scheme:
a backwashing device of a gas washing type sand filter comprises a filter pool body, wherein the filter pool body adopts a closed filter pool body, a sand filtering layer is arranged in the filter pool body, the bottom of the sand filtering layer is supported by a permeable supporting plate, so that a bottom space is formed in the filter pool body at the bottom of the sand filtering layer, and a sewage discharge port is arranged at the bottom of the filter pool body and used for discharging sewage in the bottom space; the interior of the filter tank body at the upper part of the sand filtering layer forms an upper space;
a sewage inlet pipeline is arranged in the filter tank body, a water outlet at the bottom of the sewage inlet pipeline is connected with a water distributor, a water outlet end of the water distributor is positioned below the sand filtering layer and is communicated with the bottom space, and a sewage inlet at the top of the sewage inlet pipeline is led out of the filter tank body through a flange interface and is connected to a sewage water storage tank through a pipeline;
a clear water overflow port is arranged on the side wall of the upper space of the filter tank body, the clear water overflow port is connected with a clear water storage tank through a pipeline, a backwash water supply port is arranged at the bottom of the clear water storage tank, and the backwash water supply port is communicated to the bottom space of the filter tank body through a return pipeline;
a backwashing water outlet is also arranged on the side wall of the upper space of the filter tank body and is used for discharging sewage and water mixed liquid after backwashing;
the inner wall of the filter tank body is provided with a plurality of aeration disks, the number of the aeration disks is multiple, a plurality of layers are arranged along the height direction of the filter tank body, and the aeration disks of each layer are distributed at equal intervals along the circumferential direction of the inner wall of the filter tank body; the aeration disc is connected with a high-pressure air source device outside the filter tank body through an air supply pipeline.
In the technical scheme, a first electric control valve is arranged on a pipeline between the sewage water storage tank and a sewage water inlet of a sewage water inlet pipe of the filter tank body.
In the technical scheme, a second electric control valve is arranged on a backwashing water supply pipeline of the clear water storage tank.
In the technical scheme, a third electric control valve is arranged at the backwashing water outlet.
In the above technical scheme, a fourth electric control valve is arranged at a sewage discharge outlet at the bottom of the filter tank body.
In the technical scheme, the liquid level meter is arranged on the sewage storage tank, when the liquid level meter detects that the liquid level in the sewage storage tank rises and reaches a set critical value, the amount of flocs or precipitated particles accumulated in the filter material of the filter tank body of the feedback filter tank is increased, and the flocs or the precipitated particles accumulated in the filter material in the sand filter tank body need to be cleaned.
In the technical scheme, the backwashing water outlet of the filter tank body is connected with the siphon water outlet pipe group, and the backwashing effect is enhanced by utilizing the siphon principle.
In the technical scheme, the outer wall of the vertical section of the sewage inlet pipeline is provided with the aeration disc, the top surface of the water distributor is provided with the aeration disc, the sewage inlet pipeline is parallelly provided with the air supply pipeline for the aeration disc and the aeration disc, and the air supply end of the air supply pipeline leads out of the filter body of the filter from the side wall of the filter body.
In the technical scheme, the vertical section of the sewage inlet pipeline is coaxially arranged with the filter tank body, the number of the aeration disks on the sewage inlet pipeline is multiple, and the sewage inlet pipeline is preferably arranged at equal intervals along the circumferential direction of the vertical section.
In the above technical scheme, the number of the aeration disks on the top surface of the water distributor is multiple, and the aeration disks are preferably arranged at equal intervals in the circumferential direction of the top surface of the water distributor.
The utility model has the advantages and beneficial effects that:
compared with the mode of cleaning up the accumulated flocs or the precipitated particles on the filter tank by the prior sand filter tank, the backwashing device of the air-washing sand filter tank has the advantages that the backwashing device of the air-washing sand filter tank is compared with the original single siphon backwashing, the filter material and the accumulated flocs are impacted by compressed air through the aeration disc due to the active intervention of aeration, the blowing-off effect is achieved, the hardened filter material is separated from the flocs or the precipitated particles, the follow-up backwashing is matched with the siphon, the air-water double-washing effect is achieved, the backwashing efficiency is greatly improved, and the backwashing duration is shortened. Simultaneously under the hardened condition of filter material, only need through long, the atmospheric pressure of increase air purge, simultaneously increase according to the circumstances that the air water backwash is long can, need not to wash the filtering pond evacuation again, use high-pressure squirt by the manual work again and wash or directly change the filter material, extension filter material life. The air-water double washing of floc or precipitated particles accumulated in the filter material can be finished by operating the opening and closing of the corresponding valves, the cleaning intensity of the filter material is enhanced, the cleaning time is shortened, the labor intensity of personnel is reduced, and great convenience is brought to the water purification treatment work.
Drawings
Fig. 1 is a schematic structural diagram of a backwashing device for an air-washing sand filter according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a backwashing device of an air-washing sand filter in a third embodiment of the utility model.
Fig. 3 is a schematic structural diagram of a backwashing device of an air-washing sand filter according to a fourth embodiment of the utility model.
Wherein:
1: filter tank body, 2: sand filtration layer, 3: water permeable supporting plate, 4: drain, 5: sewage inlet line, 6: water distributor, 7: sewage inlet, 8: sewage water storage tank, 9: clear water overflow port, 10: clear water storage tank, 11: backwash water supply port, 12: backwash drain port, 13: aeration disc, 14: siphon drain group, 15: a gas supply line.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Example one
Referring to the attached figure 1, the air-washing type sand filter backwashing device comprises a filter tank body 1, wherein the filter tank body is a closed filter tank body, a sand filtering layer 2 is arranged in the filter tank body, the bottom of the sand filtering layer is supported by a permeable supporting plate 3, so that a bottom space is formed in the filter tank body at the bottom of the sand filtering layer, and a sewage outlet 4 is formed in the bottom of the filter tank body and used for discharging sewage in the bottom space; the interior of the filter tank body at the upper part of the sand filtering layer forms an upper space.
A sewage inlet pipeline 5 is arranged inside the filter tank body, a water distributor 6 is connected with a bottom water outlet of the sewage inlet pipeline, a water outlet end of the water distributor is positioned below the sand filtering layer and communicated with the bottom space, and a sewage inlet 7 at the top of the sewage inlet pipeline is led out of the filter tank body through a flange interface and then connected to a sewage water storage tank 8 through a pipeline.
The side wall of the upper space of the filter tank body is provided with a clear water overflow port 9, the clear water overflow port is connected with a clear water storage tank 10 through a pipeline, the bottom of the clear water storage tank is provided with a backwashing water supply port 11, and the backwashing water supply port is communicated to the bottom space of the filter tank body 1 through a return pipeline.
A backwashing water outlet 12 is also arranged on the side wall of the upper space of the filter tank body and is used for discharging the sewage and water mixed liquid after backwashing. The backwash drain 12 is preferably provided 10cm above the sand screen 2.
The inner wall of the filter tank body is provided with a plurality of aeration disks 13, a plurality of layers (2 layers in the figure are taken as an example) are arranged along the height direction of the filter tank body, and the aeration disks of each layer are distributed at equal intervals along the circumferential direction of the inner wall of the filter tank body; the aeration disc is connected with a high-pressure air source device outside the filter tank body through an air supply pipeline.
Furthermore, a first electric control valve a is arranged on a pipeline between the sewage water storage tank 8 and a sewage water inlet of a sewage water inlet pipe of the filter tank body.
Further, a second electric control valve b is arranged on the back washing water supply pipeline of the clean water storage tank 10.
Further, a third electrically controlled valve c is provided at the backwash water discharge port 12.
Furthermore, a fourth electric control valve d is arranged at a sewage outlet 4 at the bottom of the filter pool body.
When the filter tank normally works, the first electric control valve a is opened, the second electric control valve b, the third electric control valve c and the fourth electric control valve d are closed, sewage enters a sewage inlet pipeline inside the filter tank body from the sewage storage tank through a sewage inlet on the filter tank body and flows out to the bottom space below the sand filtering layer from the water distributor along the sewage inlet pipeline, the sewage is uniformly distributed by the water distributor and then flows upwards, the filtering is completed through the sand filtering layer, and clear water is gathered in the upper space of the filter tank body and is discharged to the clear water tank from a clear water overflow port.
When backwashing is needed, firstly closing the first electric control valve a and opening the fourth electric control valve d to discharge sludge in the bottom space in the filter tank body from the sewage discharge outlet 4, then closing the fourth electric control valve d, and opening the second electric control valve b and the third electric control valve c to enable clean water in the clean water tank 10 to enter the bottom space in the filter tank body, backwashing is carried out, in the backwashing process, a high-pressure air source device is started to enable an aeration disc to aerate so as to enable sand grains in a sand filtering layer to move, the sand grains rub with each other during movement, flocculent dirt attached to the sand grains is peeled off and flows upwards along with backwashing water (the height of the clean water tank 10 is higher than that of the sand filtering layer, and backwashing water can penetrate through the sand filtering layer from the bottom space to flow upwards to the upper space of the filter tank body under the action of pressure difference), so that dirt is brought to the upper space of the filter tank body, and then is discharged out of the filter pool body from a backwashing water outlet 12.
Example two
On the basis of the first embodiment, further, a liquid level meter is arranged on the sewage storage tank 8, when the liquid level meter detects that the liquid level in the sewage storage tank rises and reaches a set critical value, the amount of flocs or precipitated particles accumulated in the filter material of the filter tank body of the feedback filter tank is increased, and the flocs or precipitated particles accumulated in the filter material in the sand filter tank body need to be cleaned.
EXAMPLE III
On the basis of the first embodiment, further referring to the attached figure 2, a backwashing water outlet 12 of the filter tank body 1 is connected with a siphon water outlet pipe group 14, and the backwashing effect is enhanced by utilizing the siphon principle.
Example four
On the basis of the first embodiment, further referring to fig. 3, in addition to the aeration disk 13 arranged on the inner wall of the filter tank body, the present embodiment is further provided with an aeration disk 13-2 arranged on the outer wall of the vertical section 5-1 of the sewage inlet pipeline 5 and an aeration disk 13-3 arranged on the top surface of the water distributor 6, an air supply pipeline 15 for the aeration disk 13-2 and the aeration disk 13-3 is arranged on the sewage inlet pipeline 5 in parallel, and the air supply end of the air supply pipeline 15 leads out of the filter tank body from the side wall of the filter tank body.
Further, the vertical section 5-1 of the sewage inlet pipeline 5 is coaxially arranged with the filter tank body, and a plurality of aeration discs 13-2 are arranged on the vertical section 5-1, preferably at equal intervals along the circumferential direction.
Further, the number of the aeration disks 13-3 on the top surface of the water distributor 6 is plural, and the aeration disks are preferably arranged at equal intervals in the circumferential direction on the top surface of the water distributor 6.
The advantages of the embodiment are: the inside of the filter tank body forms a sand filtering layer: aeration from bottom to top, by the aeration of cell body inner wall to the center and by the aeration mode of cell body center to cell body inner wall, three kinds of aeration modes combine together, can improve the motion effect that promotes the sand grain greatly, and then promote backwash efficiency and effect.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The utility model has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the utility model fall within the scope of the utility model.
Claims (10)
1. The utility model provides a back washing unit of air washing formula sand filter which characterized in that: the filter tank body adopts a closed filter tank body, a sand filtering layer is arranged in the closed filter tank body, the bottom of the sand filtering layer is supported by a permeable supporting plate, so that a bottom space is formed in the filter tank body at the bottom of the sand filtering layer, and a sewage discharge port is arranged at the bottom of the filter tank body and used for discharging sewage in the bottom space; the interior of the filter tank body at the upper part of the sand filtering layer forms an upper space;
a sewage inlet pipeline is arranged in the filter tank body, a water outlet at the bottom of the sewage inlet pipeline is connected with a water distributor, a water outlet end of the water distributor is positioned below the sand filtering layer and is communicated with the bottom space, and a sewage inlet at the top of the sewage inlet pipeline is led out of the filter tank body through a flange interface and is connected to a sewage water storage tank through a pipeline;
a clear water overflow port is arranged on the side wall of the upper space of the filter tank body, the clear water overflow port is connected with a clear water storage tank through a pipeline, a backwash water supply port is arranged at the bottom of the clear water storage tank, and the backwash water supply port is communicated to the bottom space of the filter tank body through a return pipeline;
a backwashing water outlet is also arranged on the side wall of the upper space of the filter tank body;
the inner wall of the filter tank body is provided with a plurality of aeration disks, the number of the aeration disks is multiple, a plurality of layers are arranged along the height direction of the filter tank body, and the aeration disks of each layer are distributed at equal intervals along the circumferential direction of the inner wall of the filter tank body; the aeration disc is connected with a high-pressure air source device outside the filter tank body through an air supply pipeline.
2. The air-wash sand filter backwash device according to claim 1, characterized in that: a first electric control valve is arranged on a pipeline between the sewage water storage tank and a sewage water inlet of a sewage water inlet pipe of the filter tank body.
3. The air-wash sand filter backwash device according to claim 2, characterized in that: a second electric control valve is arranged on the backwashing water supply pipeline of the clear water storage tank.
4. The air-wash sand filter backwash device according to claim 3, characterized in that: and a third electric control valve is arranged at the backwashing water outlet.
5. The air-wash sand filter backwash device according to claim 4, characterized in that: a fourth electric control valve is arranged at the sewage outlet at the bottom of the filter tank body.
6. The air-wash sand filter backwash device according to claim 5, characterized in that: a liquid level meter is arranged on the sewage storage tank.
7. The air-wash sand filter backwash device according to claim 1, characterized in that: the backwashing water outlet of the filter tank body is connected with a siphon water outlet pipe group, and the backwashing effect is enhanced by utilizing the siphon principle.
8. The air-wash sand filter backwash device according to claim 1, characterized in that: an aeration disc is arranged on the outer wall of the vertical section of the sewage inlet pipeline, an aeration disc is arranged on the top surface of the water distributor, an air supply pipeline to the aeration disc is arranged on the sewage inlet pipeline in parallel, and the air supply end of the air supply pipeline leads out of the filter body of the filter from the side wall of the filter body of the filter.
9. The air-wash sand filter backwash device according to claim 8, characterized in that: the vertical section of the sewage inlet pipeline is coaxial with the filter tank body, and the number of aeration discs on the sewage inlet pipeline is a plurality, and the aeration discs are circumferentially arranged at equal intervals along the vertical section.
10. The air-wash sand filter backwash device according to claim 8, characterized in that: the number of the aeration disks on the top surface of the water distributor is a plurality, and the aeration disks are arranged on the top surface of the water distributor at equal intervals along the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120662741.1U CN215310423U (en) | 2021-03-31 | 2021-03-31 | Air-washing type sand filter backwashing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120662741.1U CN215310423U (en) | 2021-03-31 | 2021-03-31 | Air-washing type sand filter backwashing device |
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| Publication Number | Publication Date |
|---|---|
| CN215310423U true CN215310423U (en) | 2021-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120662741.1U Active CN215310423U (en) | 2021-03-31 | 2021-03-31 | Air-washing type sand filter backwashing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215310423U (en) |
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2021
- 2021-03-31 CN CN202120662741.1U patent/CN215310423U/en active Active
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