CN201253505Y - Gas-stripping type continuous sand filtering device - Google Patents

Abstract

The utility model provides an air-lift continuous sand filter device, which comprises a shell, a sand bed is filled from the upper half of the shell to the bottom, a water supply pipe is arranged in the middle of the sand bed, and a water supply pipe is arranged outside the top of the shell. The water outlet pipe is characterized in that one end of the water supply pipe extends out of the sand bed and is connected to the sand washer, one end of the sand washing water discharge pipe is fixed on the sand washer, and the other end of the sand washing water discharge pipe is arranged outside the shell, One end of the water inlet pipe is connected to the outer side of the water supply pipe, and the other end of the water inlet pipe is arranged outside the shell. The other end of the water supply pipe is equipped with a high-density polyethylene water distribution and sand distribution device. There is an airlift pipe in the middle of the sand distribution device, and the end of the airlift pipe is located outside the high-density polyethylene water distribution and sand distribution device. The top of the airlift pipe is connected to the sand washer. The airlift pipe is a double-layer interlayer pipe. The outer wall and the inner wall at the end are sealed, and at least one opening is arranged on the inner wall. The utility model has the advantages of continuous use, high operating efficiency, small occupied area and suitable for low pH water quality conditions.

Description

An air-lift continuous sand filter device

technical field

The utility model relates to an air-lift continuous sand filter device, which is used to realize the recycling of filter sand while filtering waste water, and belongs to the technical field of filter devices.

Background technique

The sand filter device is a device that filters and removes suspended particles and flocs in a liquid. Conventional sand filter equipment must carry out filter sand cleaning after intercepting a certain amount of suspended solids, which is the so-called filter sand backwashing. Since this flushing is carried out under the condition of stopping the filtration, it will affect the continuity of the filtration operation and reduce the operating efficiency. At the same time, backwashing will increase the flushing equipment, increase energy consumption, and affect the efficiency of operation.

Contents of the invention

The purpose of this utility model is to provide a sand filter device which can be used continuously, has high operating efficiency, occupies a small area, and is suitable for water quality conditions with low pH value.

In order to achieve the above purpose, the technical solution of the present invention is to provide an air-lift continuous sand filter device, which includes a shell, a sand bed is filled from the upper half of the shell to the bottom, and a water supply is provided in the middle of the sand bed. There is a water outlet pipe on the outer side of the top of the shell. It is characterized in that one end of the water supply pipe extends to the outside of the sand bed and is connected to the sand washer. One end of the sand washing water discharge pipe is fixed on the sand washer, and the sand washing water is discharged. The other end of the pipe is set outside the casing, and one end of the water inlet pipe is connected to the outside of the water supply pipe. There is an air lift pipe between the water supply pipe and the high-density polyethylene water distribution and sand distribution device, the end of the air lift pipe is located outside the high-density polyethylene water distribution and sand distribution device, and the top of the air lift pipe is connected to the sand washer, wherein, The airlift tube is a double-layer interlayer tube, the outer wall and the inner wall at the end are sealed, and at least one opening is arranged on the inner wall.

Further, an aeration distributor is provided above the high-density polyethylene water distribution and sand distribution device and outside the water supply pipe.

The suspended solids or flocs in the wastewater flowing in through the water inlet pipe enter the interception of the filter sand in the sand bed, so that the water quality becomes clear, and are discharged through the outlet pipe up to the standard. The airlift tube lifts the continuously flowing filter sand from the bottom to the sand washer at the upper part of the equipment, and washes it in the "labyrinth" of the sand washer through the adjustable backwash water level, and the washed filter sand is continuously flowed by gravity Flows naturally into the sand bed for repeated use.

The utility model has the following advantages: 1. It can provide continuous filtration treatment; 2. Equipped with an aeration distributor, it can be used for digestion treatment; 3. The high-density polyethylene water distribution and sand distribution device can be applied to occasions with low pH water quality conditions; 4. The high-density polyethylene water distribution and sand distribution device is used to integrate the water distribution device and the sand distribution cover, which is convenient for production and transportation, and solves the support problem of the water distribution device.

Description of drawings

Fig. 1 is the structural representation of a kind of air lifting type continuous sand filter device provided by the utility model;

Fig. 2 is a top view structural diagram of the high-density polyethylene water distribution and sand distribution device;

Figure 3 is a partial enlarged view of the end of the stripping tube.

Detailed ways

The utility model is described in detail below in conjunction with embodiment.

Example

As shown in Figure 1 and Figure 3, it is a structural schematic diagram of an air-lift continuous sand filter device provided by the utility model, including a water inlet pipe 1, a water supply pipe 2, a sand bed 4, an outlet pipe 5, an air-lift pipe 8, a washing Sand water discharge pipe 9, sand washer 10, aeration distributor 13, housing 15, and high-density polyethylene water distribution and sand distribution device 16.

Wherein, a sand bed 4 is filled from the upper half to the bottom in the housing 15, a water supply pipe 2 is provided in the middle of the sand bed 4, and a water outlet pipe 5 is provided outside the top end of the housing 15. It is characterized in that the water supply pipe 2 One end of one end extends to the outside of the sand bed 4 and connects to the sand washer 10, one end of the sand washing water discharge pipe 9 is fixed on the sand washer 10, and the other end of the sand washing water discharge pipe 9 is arranged outside the shell 15, and is connected to the water supply The outside of the pipe 2 communicates with one end of the water inlet pipe 1, the other end of the water inlet pipe 1 is arranged outside the casing 15, and the other end of the water supply pipe 2 is provided with a high-density polyethylene water distribution and sand distribution device 16. An air lift pipe 8 is arranged in the middle of the high-density polyethylene water distribution and sand distribution device 16, and the end of the air lift pipe 8 is arranged outside the high-density polyethylene water distribution and sand distribution device 16, and the top of the air lift pipe 8 is connected to the sand washer 10 ,

Wherein, the stripping tube 8 is a double-layer interlayer tube, the outer wall 20 and the inner wall 19 at the end thereof are sealed, and the inner wall 19 is provided with four openings 18 .

Further, an aeration distributor 13 is provided above the high-density polyethylene water distribution and sand distribution device 16 and outside the water supply pipe 2 . The stripping tube 8 is a double-layer interlayer tube. An aeration distributor 13 is arranged on the water inlet distributor 3, which can be used in the sand filtration digestion process.

As shown in FIG. 2 , it is a structural diagram of a high-density polyethylene water distribution and sand distribution device, which is composed of a center plate 17 with a hole in the middle, a water distributor 3 and a sand distribution cover 12 .

Among them, eight water distributors 3 are evenly spaced around the center plate 17 perforated in the middle, a support plate 14 is provided on the water distributor 3 , and a cloth sand cover 12 is provided on the water distributor 3 and the support plate 14 .

Further, the number of the water distributors 3 is the same as the number of the aeration distributors 13 .

The working principle of the utility model is: waste water enters the air-lift continuous sand filter device through the water inlet 1, communicates with the central pipe 2 through a soft connection, and the water supply pipe 2 is directly connected with the water distributor 3, which is a uniformly designed central distribution After the influent water is evenly distributed, it flows into the sand bed 4 and is filtered by the filter sand in the sand bed 4 to form a sand filter water 11, which rises to the overflow weir plate on the upper part of the air-lift continuous sand filter device, and overflows through the outlet pipe 5. . The dirty filter sand 6 in the sand bed is controlled by the flow channel of the sand cloth cover 12, and quantitatively flows to the lower part of the air-lift continuous sand filter device, and is lifted to the air-lift continuous sand filter device under the action of the air-lift tube 8 The upper sand washer 10 is cleaned by backwash water (ie, sand washing water) 9, and the available filter sand 7 falls back to the sand bed 4 from the "maze" of the sand washer 10, and is continuously and repeatedly used.

The air lift principle is based on the principle of gravity difference formed by the different densities of the material in the tube of the gas lift tube 8 and the material outside the tube of the gas lift tube 8 . Compressed air is injected into the gap between the outer wall 20 and the inner wall 19 of the stripping tube 8 at the top of the stripping tube 8, and the compressed air lifts dirty filter sand, water and air to the sand washer 10 through the opening 18 for cleaning. At the same time, the gas lift volume and rising speed of the dirty filter sand can be adjusted by changing the gas volume of the injected compressed air.

The formation of backwash water 9 depends on the liquid level difference between the outlet pipe 5 at the top of the sand filter and the sand washer 10 . Since the liquid level of the sand washer 10 can be adjusted, the amount of backwash water can be adjusted.

Under the condition of low pH value water quality, the internal material is high-density polyethylene. Considering that the rigidity of plastic is not as good as that of metal, the utility model makes the water distributor 3 and the cloth sand cover 12 through the support plate 14 as a whole, which is beautiful and convenient. processing, and at the same time solve the rigidity requirements of the inner parts material.

Claims (5)

1. A kind of air-lifting type continuous sand filter device, comprises shell (15), the sand bed (4) that is filled with filter sand from the upper half in shell (15) to the bottom, in sand bed (4) A water supply pipe (2) is provided in the middle, and a water outlet pipe (5) is provided outside the top of the casing (15). It is characterized in that one end of the water supply pipe (2) is closed and extends to the outside of the sand bed (4) and is connected to the sand washing machine. device (10), one end of the sand washing water discharge pipe (9) is fixed on the sand washing device (10), and the other end of the sand washing water discharge pipe (9) is arranged outside the housing (15), and the water supply pipe ( The outer side of 2) communicates with one end of the water inlet pipe (1), the other end of the water inlet pipe (1) is arranged outside the casing (15), and the other end of the water supply pipe (2) is provided with a high-density polyethylene water distribution and cloth The sand device (16) is provided with an airlift pipe (8) between the water supply pipe (2) and the high-density polyethylene water distribution and sand distribution device (16), and the end of the airlift pipe (8) is arranged on the high-density polyethylene water distribution and the sand distribution device (16), the top of the air lift pipe (8) is connected to the sand washer (10), Wherein, the stripping tube (8) is a double-layer interlayer tube, the outer wall (20) and the inner wall (19) at the end are sealed, and at least one opening (18) is provided on the inner wall (19). 2. A kind of air-lift type continuous sand filter device as claimed in claim 1, is characterized in that, above described high-density polyethylene water distribution and sand distribution device (16) and the outside of described water supply pipe (2) is provided with There are aeration distributors (13). 3. A kind of air-lift type continuous sand filter device as claimed in claim 1, is characterized in that, described high-density polyethylene water distribution and sand distribution device (16) is made of center plate (17) of middle perforation, water distributor ( 3) and a cloth sand cover (12), wherein at least two water distributors (3) are evenly spaced around the center plate (17) perforated in the middle, and a support plate (3) is provided on the water distributor (3). 14), the cloth sand cover (12) is provided around the water distributor (3) and the support plate (14). 4. The air-lift continuous sand filter device according to claim 3, characterized in that, the number of the water distributors (3) is the same as the number of the aeration distributors (13). 5. A kind of air-lifting continuous sand filter device as claimed in claim 1, characterized in that, the air-lifting pipe (8) is a double-layer interlayer pipe.

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