CN220609487U - Sand filter - Google Patents

Abstract

The utility model relates to the field of farmland drip irrigation, and provides a sand filter, which comprises a vertical cylinder, wherein an upper seal head is fixedly arranged at the top of the cylinder, and a lower seal head is fixedly arranged at the bottom of the cylinder; a water inlet for raw water to enter is arranged above the upper seal head; an annular cover plate is arranged at the upper part of the cylinder body, an outer ring of the cover plate is fixed on the inner wall of the cylinder body, and an upper end ring of the inner net is annularly fixed on the edge of an inner ring of the cover plate; the upper end of the outer net is annularly fixed on the inner side of the outer ring of the cover plate, the lower ends of the inner net and the outer net are both annularly fixedly connected to the lower sealing head, the outer net is at a certain distance from the cylinder body, a filler for filtering raw water is filled between the inner net and the outer net, and the inner net, the outer net and the filler form an annular sand bed; the lower side of the cylinder is provided with a water outlet for conveying the filtered water passing through the sand bed to the outside. The utility model comprises a vertical cylinder body, the appearance is compact, and the cost is lower; the sand bed with a larger filtering area has higher filtering water outlet efficiency; the automatic cleaning device can reduce the amount of manual labor.

Description

Sand filter

Technical Field

The utility model relates to the field of farmland drip irrigation filtration, in particular to a sand filter.

Background

With the gradual development of modern agriculture in China, high and new technology agriculture is more and more, a plurality of kinds of irrigation water filters appear in agricultural irrigation, and the irrigation water filters play an important role in the development of agricultural irrigation science.

The existing sand filter is structurally characterized in that a horizontal tank body is adopted, an upper partition plate and a lower partition plate are used in the tank body, an upright partition plate is arranged in the middle of the tank body and welded on a cylinder body, a bin is divided into a left bin and a right bin, the lower partition plate is also a porous plate, a filter cap is arranged on the porous plate, quartz sand is arranged on the filter cap for filtering by using the filter cap as a sand bed, a clear water bin is arranged below the lower partition plate, and water in working is filtered by the sand bed and the filter cap; and the clean water is discharged from the water outlet of the sewer sump.

The defects are as follows:

1) The filter cap has smaller filtering area, so that the filtering water outlet efficiency is low;

2) The middle is provided with a compartment plate, dirt, impurities and anvil type are attached to the sand bed during automatic back flushing, and the flushing force is slowed down after the porous upper filter cap is blocked during secondary flushing and repeated flushing;

3) After one filtering period, the filtering cap is blocked, impurities and other auxiliary materials are attached to the sand bed, manual back flushing is needed, the bin valves of the bin bodies are closed and the water is drained and cleaned one by one, and repeated back flushing is needed, so that the labor is wasted, and the attached impurities are not easy to clean by manpower.

Disclosure of Invention

In order to overcome the technical problems, the utility model aims to provide the sand filter which is reasonable in structure, utilizes the inner wedge type net and the outer wedge type net, adopts a sand bed as a middle filter medium, achieves the expected filtering and purifying effect through three-stage filtering water, and simultaneously increases a self-cleaning device, avoids blocking a buried pipeline and a capillary tube of a water outlet pipe, and greatly reduces the labor amount of manual flushing.

The utility model provides the following technical scheme:

the sand filter comprises a vertical cylinder body (7), wherein an upper sealing head (10) is fixedly arranged at the top of the cylinder body (7), and a lower sealing head (3) is fixedly arranged at the bottom of the cylinder body; a water inlet for raw water to enter is arranged above the upper seal head (10); an annular cover plate (8) is arranged at the upper part of the cylinder body (7), the outer ring of the cover plate (8) is fixed on the inner wall of the cylinder body (7), and the upper ring of the inner net (6) is annularly fixed on the inner ring edge of the cover plate (8); the upper end of the outer net (5) is annularly fixed on the inner side of an outer ring of the cover plate (8), the lower ends of the inner net and the outer net are all annularly fixedly connected to the lower seal head (3), the outer net (5) is at a certain distance from the cylinder body (7), a filler (4) for filtering raw water is filled between the inner net and the outer net, and the inner net (6), the outer net (5) and the filler (4) form an annular sand bed; a sand discharge port capable of discharging sand outwards is arranged between the inner net and the outer net and at the bottom of the lower seal head (3); a water outlet for conveying the filtered water passing through the sand bed to the outside is arranged on the side surface of the lower part of the cylinder body (7).

According to some embodiments, the water inlet comprises a water inlet pipe (12) and a first electrically operated valve (11) for controlling the inlet water; the water outlet comprises a water outlet pipe (16) and a third electric valve (15) for controlling water outlet; a self-cleaning filter (14) and a second electric valve (13) are connected between the first electric valve (11) and the third electric valve (15) in sequence through pipelines.

In the above embodiments, the self-cleaning filter is a small self-cleaning filter commonly used in the market, and will not be described here.

According to some embodiments, the cover plate (8) comprises an annular sealing plate (19) fixed on the upper part of the inner wall of the cylinder (7), the inner net (6) and the upper end of the outer net (5) are fixedly connected to the sealing plate (19), the compartment plate (20) is attached between the bottom surface of the sealing plate (19) and the inner wall of the outer net (5) and the cylinder (7), and the compartment plate (20) is fixedly connected with the sealing plate (19).

According to some embodiments, the inner mesh (6) and the outer mesh (5) are selected from wedge meshes.

According to some embodiments, the filler (4) is selected from quartz sand.

According to some embodiments, a drain outlet for outward drain is arranged between the inner net (6) and the outer net (5) and at the bottom of the lower seal head (3).

According to some embodiments, the drain comprises a drain pipe (18) and a fourth electrically operated valve (17) for controlling the drain.

Compared with the prior art, the utility model has the following beneficial effects:

1) The vertical filter has compact appearance structure, a sand bed with larger filtering area, higher filtering water outlet efficiency, compact overall layout and space saving.

2) The utility model overcomes the defects that the prior sand filter has complex internal structure, the upper and lower partition plates, the left and right partition plates in the cylinder body are required to be welded, and the cost is high.

3) The controllable automatic back flushing and the back flushing controlled by the electric valve are adopted, so that residues on the inner wall of the wedge-shaped net and impurities in water can be automatically cleaned at one time, and the defect of complicated cleaning of each bin in the past is overcome.

Drawings

Fig. 1 is a schematic diagram of a first embodiment provided in the present utility model.

Fig. 2 is an enlarged view of a cover plate according to a first embodiment of the present utility model.

The reference numerals in the drawings are:

a support leg 1; a sand discharge pipe 2; a lower end socket 3; a filler 4; an outer net 5; an intranet 6; a cylinder 7; a cover plate 8; a flange 9; an upper head 10; a first electrically operated valve 11; a water inlet pipe 12; a second electrically operated valve 13; a self-cleaning filter 14; a third electrically operated valve 15; a water outlet pipe 16; a fourth electrically operated valve 17; a drain pipe 18; a closing plate 19; a compartment plate 20; self-cleaning tube 21.

Detailed Description

The present utility model will be described in detail with reference to the following examples and drawings, but it should be understood that the examples and drawings are only for illustrative purposes and are not intended to limit the scope of the present utility model in any way. All reasonable variations and combinations that are included within the scope of the inventive concept fall within the scope of the present utility model.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc., are based on those shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model; the terms "first," "second," "third," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and further, unless otherwise expressly specified and defined, the terms "disposed," "mounted," "connected," "coupled," and the like are to be construed broadly, and may be either fixedly coupled, detachably coupled, or integrally coupled, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The utility model is further described below with reference to the accompanying drawings.

Examples

As shown in the embodiment of fig. 1, the filter comprises a vertical cylindrical barrel 7, the bottom of the barrel 7 is supported by a supporting leg 1, the top of the barrel 7 is connected with an upper seal head 10 through a flange 9, and the bottom is fixedly connected with a lower seal head 3; the upper end enclosure 10 is connected with a water inlet pipe 12 and a first electric valve 11 for raw water to enter upwards, a sand discharge pipe 2 capable of discharging sand outwards is arranged at the bottom of the lower end enclosure 3, between the inner net 6 and the outer net 5, an annular inner net 6 is arranged in the barrel 7, the outer net 5 is arranged outside the inner net 6, a filler 4 for filtering sand in raw water is filled between the inner net and the outer net, and quartz sand can be selected as the filler 4. The upper ends of the inner net 6 and the outer net 5 extend to the upper part of the cylinder 7, the inner net 6 and the outer net 5 are fixedly connected by a cover plate 8 fixed on the upper part of the inner wall of the cylinder 7, the cover plate 8 is annular, the upper end of the inner net 6 is fixedly connected to the inner ring edge of the cover plate 8, the upper end of the outer net 5 is fixedly connected to the inner side of the outer ring of the cover plate 8, and the outer net 5 is at a certain distance from the inner wall of the cylinder 7; the lower ends of the inner net 6 and the outer net 5 are fixedly connected to the lower seal head 3 at the bottom of the cylinder 7, so that a raw water cavity is formed inside the annular inner net 6, and a filtered water cavity is formed between the outer net 5 and the inner wall of the cylinder 7; the inner net 6, the outer net 5 and the quartz sand form an annular sand bed. A water outlet pipe 16 for delivering the filtered water in the filtered water cavity to the outside and a third electric valve 15 for controlling the water outlet amount are provided at the lower side of the cylinder 7. At the bottom of the raw water cavity, a drain structure for outward drain is arranged on the lower seal head 3, and the drain structure is a drain pipe 18 and a fourth electric valve 17.

The inner net 6 and the outer net 5 are selected from wedge-shaped nets, and the wedge-shaped nets are mostly formed by winding and welding stainless steel triangular wires and stainless steel trapezoidal wires and are commonly used as filter screens of various water treatment equipment.

As shown in fig. 2, the cover plate 8 comprises a circular sealing plate 19 fixed on the upper inner wall of the cylinder 7, the upper ends of the inner net 6 and the outer net 5 are fixedly connected to the sealing plate 19, and in order to separate the outer net 7 from the inner wall of the cylinder 7, a compartment plate 20 is arranged between the bottom surface of the sealing plate 19, the outer net 5 and the inner wall of the cylinder 7, and quartz sand between the inner net and the outer net is compressed by bolts.

In order to realize the self-cleaning function of the present embodiment, a self-cleaning filter 14 and a second electric valve 13 connected by a self-cleaning pipe 21, which is a commonly used small-sized stone filter for filtering backwash water, are provided between the water inlet and the water outlet outside the cylinder 7 of the present embodiment, that is, between the water outlet pipe 16 at the front end of the water inlet of the first electric valve 11 and the third electric valve 15. The third electric valve 15 and the first electric valve 11 are closed, the second electric valve 13 is opened, water at the water inlet is filtered by the self-cleaning filter 14, the outer net 5, the filler 4 and the inner net 6 are reversely flushed, and the blocking objects of the inner net 6 and the outer net 5 are reversely flushed, so that blocking of meshes is avoided.

The annular sand bed formed by the inner net 6, the filler 4 and the outer net 5 of the embodiment is used for filtering sand in raw water, the filtering area of the annular sand bed is larger than that of a porous plate which is commonly used in the prior art and is provided with a filter cap, and the filtering water yield is larger.

In the prior art of 500m ³ The sand filter with the flow rate/h is used as a comparison example, and the cylinder 7 of the sand filter is generally horizontalThe filter cap with phi 100 is assembled by using a phi 1200mm end socket, and holes with phi 32mm are drilled on the porous plate, wherein each filter cap is 2.5m ³ And (3) filtering and calculating, wherein 200 filter caps are needed to meet the requirement. According to this requirement, a sheet of 1050mm by 3020mm is required to be aligned, and the total length of the cylinder is 3030mm.

If the vertical scheme provided by the utility model is adopted, the sealing head of phi 1200 is adopted, the diameter of the inner net 6 is 750mm, and the diameter of the outer net 5 is 1050mm, the cylinder 7 can be 1000mm long, and compared with the prior art, the vertical type filter has the advantages of smaller cylinder volume, higher filtering efficiency and more saving of cleaning labor.

The working flow of the sand filter in this embodiment is as follows:

raw water enters the cylinder 7 through the first electric valve 11, is subjected to primary filtration through the inner net 6, impurities and floaters larger than gaps of the inner net are intercepted by the primary net, water enters the sand bed again to be subjected to secondary filtration, impurities of slurry and fine water are filtered by the sand bed, and then the outer net filtration of the outer layer is performed for the third time, and the water purity is higher through the tertiary filtration. At this time, the third electric valve 15 is opened, and the filtered water passes through the water outlet pipe 16 and the electric valve 15 and enters the underground pipeline in the field. When the pressure difference between the water inlet pipe and the water outlet pipe is large after one period of operation, the first electric valve 11 and the third electric valve 15 are closed, the second electric valve 13 is opened, water is filtered by the self-cleaning filter 14 and then enters the cylinder 7 to be backwashed, the water flow direction is towards the inside from the outside, the impurity residues after the backwashed are attached to the inner wall of the inner net to be rinsed, and the impurity residues are discharged along with the drain pipe 18 controlled by the fourth electric valve 17 until the inside of the filter is rinsed completely, and then the normal forward filtering process is carried out. The working mode can achieve the effect of smooth and normal irrigation in the field for a long time.

The above examples are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited to the above examples. All technical schemes belonging to the concept of the utility model belong to the protection scope of the utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (7)

1. A sand filter, characterized by: the device comprises a vertical cylinder body (7), wherein an upper sealing head (10) is fixedly arranged at the top of the cylinder body (7), and a lower sealing head (3) is fixedly arranged at the bottom of the cylinder body; a water inlet for raw water to enter is arranged above the upper seal head (10); an annular cover plate (8) is arranged at the upper part of the cylinder body (7), the outer ring of the cover plate (8) is fixed on the inner wall of the cylinder body (7), and the upper ring of the inner net (6) is annularly fixed on the inner ring edge of the cover plate (8); the upper end of the outer net (5) is annularly fixed on the inner side of an outer ring of the cover plate (8), the lower ends of the inner net and the outer net are all annularly fixedly connected to the lower seal head (3), the outer net (5) is at a certain distance from the cylinder body (7), a filler (4) for filtering raw water is filled between the inner net and the outer net, and the inner net (6), the outer net (5) and the filler (4) form an annular sand bed; a sand discharge port capable of discharging sand outwards is arranged between the inner net and the outer net and at the bottom of the lower seal head (3); a water outlet for conveying the filtered water passing through the sand bed to the outside is arranged on the side surface of the lower part of the cylinder body (7).

2. The sand filter of claim 1 wherein: the water inlet comprises a water inlet pipe (12) and a first electric valve (11) for controlling water inflow; the water outlet comprises a water outlet pipe (16) and a third electric valve (15) for controlling water outlet; a self-cleaning filter (14) and a second electric valve (13) are connected between the first electric valve (11) and the third electric valve (15) in sequence through pipelines.

3. The sand filter of claim 1 wherein: the cover plate (8) comprises an annular sealing plate (19) fixed on the upper part of the inner wall of the cylinder body (7), the inner net (6) and the upper end of the outer net (5) are fixedly connected to the sealing plate (19), the partition plate (20) is attached between the bottom surface of the sealing plate (19) and the inner wall of the outer net (5) and the cylinder body (7), and the partition plate (20) is fixedly connected with the sealing plate (19).

4. The sand filter of claim 1 wherein: the inner mesh (6) and the outer mesh (5) are selected from wedge meshes.

5. The sand filter of claim 1 wherein: the filler (4) is selected from quartz sand.

6. The sand filter of any one of claims 1-5 wherein: a drain outlet for discharging sewage outwards is arranged between the inner net (6) and the outer net (5) and at the bottom of the lower seal head (3).

7. The sand filter of claim 6 wherein: the drain outlet comprises a drain pipe (18) and a fourth electric valve (17) for controlling drain.