A pulse continuous sand filtering device

Abstract

The invention relates to a sewage deep treatment device, specifically a pulse continuous sand filtering device, which solves the technical problems in the background technology, and comprises a filter tower and a pulse gas-water separator, wherein the filter tower comprises a cylinder and a lower end cap, a water distributor and a de-resting cone disk are arranged in the cylinder, a sand outlet is opened on the cylinder, a sand outlet is connected to a sand outlet pipe, and a sand washer is supported in the cylinder; a clean water tank is arranged on the top of the cylinder, a sand washing tank is arranged above the sand washer, and a backwash water outlet is arranged on the sand washing tank; the filter tower comprises a sand lifting pipe, one end of the sand lifting pipe is placed in the sand washing tank, a sand blasting jet is arranged on the sand lifting pipe body, and the sand outlet pipe is connected to the sand lifting pipe through the sand blasting jet; the pulse gas-water separator is provided with a gas phase outlet and a liquid phase outlet, the gas phase outlet is connected to the other end of the sand lifting pipe, the liquid phase outlet is connected to the water distributor of the filter tower, and a one-way valve is arranged on both the gas phase pipe and the liquid phase pipe. It realizes the continuous water filtering function and the sand filtering backwashing function without external air power supply.

Description

Technical Field

[0001] The invention relates to a sewage deep treatment device, in particular to a pulse continuous sand filtering device. Background Art

[0002] In the deep treatment of sewage, various types of rapid filters that use the surface area provided by the granular material in the filter layer to intercept the suspended solids in the water have been widely used. Most rapid filters operate in a cycle of filtration-backwashing. Filtration is the process of producing clean water. The sewage to be treated passes through the filter layer from top to bottom or from bottom to top in the pool. After the filter layer adsorbs and intercepts the dirt, the clean water is collected and flows out of the filter. During operation, the filter is in a fully immersed state. After a period of filtration, the filter layer is blocked by suspended matter, and the water flow resistance continues to increase. When the pressure head loss of the filter layer increases to the maximum allowable value or when the water quality of the filtered water is close to exceeding the standard, the filter should stop running and backwash. Backwashing water is generally supplied by a flushing water tank or a flushing water pump, and the water inlet pipe and the clean water branch pipe are closed, and the drain valve and the backwashing water pipe are opened. The backwashing water passes through the filter layer from bottom to top or from top to bottom in the opposite direction of the normal filtration process, and is collected and discharged by the backwashing drain tank. After backwashing, the filter tank can resume its filtering and interception capabilities and resume operation. The filtering cycle between two backwashings is generally 8-12 hours, and the backwashing usually takes about 12 minutes.

[0003] However, in the actual operation process, there are two main restrictive factors: one is the maintenance of the operation and backwash switching valve group, and the other is the human factor of process operation. These two factors will affect the operation cycle or the effluent water quality. Under the increasingly severe environmental protection situation, the contradiction is becoming increasingly prominent.

[0004] Although the technology of environmental protection industry is developing rapidly, some standards on filter materials have been formulated, and multi-layer filter tanks have been selected, etc., and even continuous sand filters from abroad were introduced in the 1980s, there are still disadvantages such as high cost, high energy consumption, large maintenance, and large human factors in process operation. Therefore, the continuous sand filtration technology introduced from abroad is not popular. The main reason is that the structure is complex, the cost is high, and a large air compressor must be installed, which consumes a lot of energy.

[0005] Therefore, in view of the shortcomings of the above-mentioned existing sand filter devices, it is very necessary to design a sand filter device with high efficiency, low energy consumption, reduced maintenance workload, and avoid human operation factors. Summary of the invention

[0006] The present invention aims to solve the technical problems of the existing sewage deep treatment devices having high cost, high energy consumption, high maintenance cost or large process operation factors, and provides a pulse continuous sand filtering device.

[0007] The technical means adopted by the present invention to solve the technical problem are:

[0008] A pulse continuous sand filtering device comprises a filter tower and a pulse gas-water separator. The filter tower comprises a cylinder and a lower head connected to the lower end of the cylinder. A water distributor is horizontally arranged in the lower part of the cylinder. A de-resting angle cone disk is supported between the cylinder walls of the cylinder below the water distributor. A sand outlet is opened on the cylinder wall of the cylinder below the de-resting angle cone disk. A sand outlet is sealed and connected to the sand outlet. The sand suction port of the sand outlet extends to the vicinity of the bottom of the lower head. A sand washer is supported by a bracket in the upper part of the cylinder. The cylinder and the lower head below the sand washer are filled with filter sand. The sand washer is composed of several layers of lantern-shaped cylinders of equal height, which are concentrically nested. Sand falling gaps are spaced between the cylinder walls of adjacent lantern-shaped cylinders. The top and bottom of the lantern-shaped cylinder are respectively fixedly connected with stop rods for connecting all the lantern-shaped cylinders. The outer side of the top of the cylinder A clean water trough is expanded in the circumferential direction, a sand washing trough connected to the sand washing device is arranged above the sand washing device, the top of the sand washing trough is higher than the top of the cylinder body and the clean water trough, a backwash water outlet is arranged on the sand washing trough, the filter tower also includes a sand lifting pipe, one end of the sand lifting pipe is placed in the sand washing trough, a sand blasting ejector is arranged on the sand lifting pipe body, and the outer end of the sand outlet pipe is connected with the sand lifting pipe through the sand blasting ejector; a sewage inlet pipeline is connected to the pulse gas-water separator, and an air ejector for inhaling air is arranged on the sewage inlet pipeline, a gas phase outlet and a liquid phase outlet are respectively arranged on the top and bottom of the pulse gas-water separator, the gas phase outlet is connected with the other end of the sand lifting pipe through the gas phase pipe, and the liquid phase outlet is connected with the water distributor of the filter tower through the liquid phase pipe, and both the gas phase pipe and the liquid phase pipe are provided with a one-way valve with a certain starting pressure.

[0009] The water distributor can ensure uniform distribution of incoming water. The purpose of setting the repose angle removal cone disk is to remove the natural stacking repose angle of filter sand. The repose angle removal cone disk can ensure uniform passage of filtered water while the sand outlet pipe at the bottom of the tower will not be crushed by the filter sand, thereby ensuring the normal operation of the sand shooting process. The sand washing device is a lantern-shaped cylinder with several layers of equal height. Adjacent lantern-shaped cylinders maintain a certain interval to form a sand falling gap. Water can pass through the sand washing device from bottom to top, and filter sand can also pass through the sand washing device from top to bottom through the interval. Water and filter sand are in tumbling contact between adjacent lantern-shaped cylinders to further clean the filter sand and ensure the flushing effect of the filter sand. The air ejector inhales air through a pressurized sewage jet, which is a mature technology. The use of air ejector air inhalation technology can save the configuration of a large air compressor in the sand lifting process, save cost and energy consumption, and save the maintenance steps of large air compressors, saving manpower and cost; the power source of the sand blasting ejector is the gas from the pulse gas-water separator. The pulsation frequency of the pulse gas-water separator is determined by the starting pressure of the one-way valve on the gas phase pipe and the liquid phase pipe. The sewage flowing out of the pulse gas-water separator is connected to the filter tower through the liquid phase pipeline and filtered by the filter sand. The gas discharged from the pulse gas-water separator drives the filter sand to be transported from the sand lifting pipe to the sand washing tank and sand washer for sand washing. The reciprocating cycle of water filtration and sand washing keeps the whole equipment running, saving maintenance costs. The fully automatic continuous pulse operation greatly improves the sand filtration efficiency of sewage deep treatment.

[0010] The working principle of the pulse continuous sand filter device described in the present invention is: the pressurized sewage enters the pulse gas-water separator from the sewage inlet pipeline, the gas enters the pulse gas-water separator together with the air ejector, and then the gas and liquid are separated in the pulse gas-water separator, the gas is discharged from the gas phase outlet through the gas phase pipe, and the sewage is discharged evenly from the water distributor in the filter tower through the liquid phase outlet through the liquid phase pipe. The sewage first flows downward, and after the cylinder body and the lower head under the water distributor are full, the sewage gradually flows upward, passes through the filter sand, and overflows from the space outside the sand washer and inside the cylinder body from the top of the cylinder body to the clean water tank, and is discharged from the clean water tank, such as by extracting and discharging through a pipeline. The gas of the pulse gas-water separator is connected to the sand lifting pipe through the gas phase pipe. Under the action of the sandblasting ejector, the sand near the sand suction port in the lower head The filter sand is sucked out and lifted to the sand washing tank from the sand lifting pipe. The clean water after passing through the filter sand rises from the bottom of the sand washing device. The filter sand falls by its own weight and comes into contact with the clean filter water rising in the reverse pulsation, which further cleans the filter sand and ensures the flushing effect of the filter sand. After cleaning, the filter sand falls in the cylinder by its own weight and continues to be filtered. The sewage used to clean the filter sand continues to rise and is discharged from the backwash water outlet of the sand washing tank. The whole cleaning process is repeated, and the filter tank does not need to stop running. Backwashing and filtering are carried out at the same time, avoiding complex piping structure and operation of switching valves, thereby avoiding maintenance of switching valves. The process is simple, avoiding the influence of human operation factors on the water filtration system, ensuring the operation cycle and effluent water quality, and does not need to rely on the introduction of high-cost equipment, reducing unnecessary energy consumption.

[0011] Preferably, the liquid phase pipe outside the liquid phase outlet is configured as a U-shaped pipe section to form a water seal at the bottom of the pulse gas-water separator. The water seal of appropriate height is retained to ensure that the gas phase inside the pulsating gas-water separator does not enter the liquid phase pipe, thereby ensuring the stability of sandblasting.

[0012] Preferably, a drain pipe port is provided at the lowest point of the liquid phase pipe, and a stop valve is provided on the drain pipe port. This arrangement is to discharge the liquid phase pipe after a certain period of time, to ensure the smoothness of the liquid phase pipe, and then to ensure the smooth filtration of the filter tower. Such a structure is more reasonable and convenient and simple to maintain.

[0013] Preferably, the sand lifting pipe extends vertically downward from the sand washing tank to the bottom of the filter tower, the sand blasting ejector is arranged horizontally opposite to the sand outlet, and the sand lifting pipe is connected to the gas phase pipe and further extends downward to form a terminal pipe, on which a stop valve is arranged. This is to regularly clean and conduct the sand lifting pipe for easy maintenance and overhaul.

[0014] Preferably, the cone disk with the angle of repose removed is a cone disk with the tip facing upward, and the angle of the cone disk is equal to the angle of repose of the filter sand naturally stacked, so as to ensure that the filter sand filtering section has a dynamic equal thickness.

[0015] Preferably, the levers at the top and bottom of the lantern-shaped cylinder are arranged in a cross shape, so that the connection between the lantern-shaped cylinders is more firm, making the sand washing device structure more stable.

[0016] Preferably, a reinforcing support structure is provided between the bottom of the clean water tank and the outer wall of the cylinder, so as to make the structure more stable and reasonable.

[0017] Preferably, the outer portion of the lower head is provided with supporting legs for supporting the filter tower, so as to make the structure more stable and reasonable.

[0018] The beneficial effects of the present invention are: reasonable structure, easy operation, and truly realizes the water filtering function and the filter sand backwashing function without external air power, without additional energy consumption, and because a pulse air-water separator is provided, the pulse sand filter has a more ideal filtering effect, and the operation or backwashing switching valve assembly is reduced to the greatest extent. There is no need to specially set up a backwashing pump, and the maintenance amount is small, and operational factors are avoided. Backwashing and filtration are carried out at the same time, and the cycle of stopping filtration for backwashing is avoided. The whole system operates in a continuous cycle, which greatly improves the efficiency of sewage deep treatment, saves costs, saves energy consumption, saves labor costs, has high economic benefits, is highly practical, and is worthy of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic structural diagram of a pulse continuous sand filtering device according to the present invention.

[0020] Figure 2 For the present invention Figure 1 A schematic diagram of the top view of the structure at the clean water tank.

[0021] Figure 3 It is a cross-sectional view of the sand washing device of the present invention.

[0022] Figure 4 for Figure 3 Top view of the .

[0023] In the figure: 1-filter tower; 2-pulse gas-water separator; 3-cylinder; 4-lower head; 5-water distributor; 6-resting cone disk; 7-sand outlet; 8-sand outlet pipe; 9-sand suction port; 10-bracket; 11-sand washer; 12-lantern-shaped cylinder; 13-gear lever; 14-sand washing trough; 16-sand lifting pipe; 17-clean water trough; 18-clean water outlet; 19-backwash water outlet; 20-sewage inlet pipeline; 21-air ejector; 22-gas phase outlet; 23-liquid phase outlet; 24-gas phase pipe; 25-sandblasting ejector; 26-liquid phase pipe; 27-one-way valve; 28-stop valve; 29-manhole; 30-discharging hole; 31-support leg. DETAILED DESCRIPTION

[0024] Reference Figure 1-Figure 4 As shown, a pulse continuous sand filtering device according to the present invention is described in detail.

[0025] A pulse continuous sand filter device, such as Figure 1 As shown, it includes a filter tower 1 and a pulse gas-water separator 2. The filter tower 1 includes a cylinder 3 and a lower head 4 connected to the lower end of the cylinder 3. A water distributor 5 is horizontally arranged in the lower part of the cylinder 3. A de-resting angle cone disk 6 is supported between the cylinder walls of the cylinder 3 below the water distributor 5. A sand outlet 7 is opened on the cylinder wall of the cylinder 3 below the de-resting angle cone disk 6. A sand outlet 7 is sealed and connected to the sand outlet 7. A sand outlet pipe 8 is sealed and connected. The sand suction port 9 of the sand outlet pipe 8 extends to the vicinity of the bottom of the lower head 4. A sand washer 11 is supported by a bracket 10 in the upper part of the cylinder 3. The cylinder 3 and the lower head 4 below the sand washer 11 are filled with filter sand. The sand washer 11 is composed of several layers of lantern-shaped cylinders 12 of the same height that are concentrically nested. Figure 3 and Figure 4 As shown, there is a sand-falling gap between the walls of adjacent lantern-shaped cylinders 12, and the top and bottom of the lantern-shaped cylinder 12 are respectively fixedly connected with a lever 13 for connecting all the lantern-shaped cylinders 12; a clean water groove 17 is expanded along the circumferential direction on the outer side of the top of the cylinder 3, and a clean water outlet 18 is provided on the clean water groove 17, as shown in detail Figure 2 A sand washing tank 14 connected to the sand washing device 11 is arranged above the sand washing device 11, the top of the sand washing tank 14 is higher than the top of the cylinder 3 and the clean water tank 17, and a backwash water outlet 19 is arranged on the sand washing tank 14. The filter tower 1 also includes a sand lifting pipe 16, one end of the sand lifting pipe 16 is placed in the sand washing tank 14, and a sand blasting ejector 25 is arranged on the sand lifting pipe 16. The end of the sand outlet pipe 8 is connected to the sand lifting pipe 16 through the sand blasting ejector 25; the pulse gas-water separator 2 is connected to the It is connected to a sewage inlet pipeline 20, and an air ejector 21 for sucking air is arranged on the sewage inlet pipeline 20. The top and bottom of the pulse gas-water separator 2 are respectively provided with a gas phase outlet 22 and a liquid phase outlet 23. The gas phase outlet 22 is connected to the other end of the sand lifting pipe 16 through a gas phase pipe 24, and the liquid phase outlet 23 is connected to the water distributor 5 of the filter tower 1 through a liquid phase pipe 26. Both the gas phase pipe 24 and the liquid phase pipe 26 are provided with a one-way valve 27 with a certain starting pressure. In a specific implementation, the number of layers of the lantern-shaped cylinder 12 of equal height in the sand washer 11 is determined by the inner diameter of the cylinder, such as Figure 4 As shown, it can be set to 5 layers.

[0026] The water distributor 5 can ensure uniform distribution of incoming water. The purpose of setting the repose angle removal cone disk 6 is to remove the natural stacking repose angle of the filter sand. The repose angle removal cone disk 6 can ensure that the filtered water passes evenly while the sand outlet pipe 8 at the bottom of the tower will not be crushed by the filter sand, thereby ensuring the normal operation of the sand shooting process. The sand washer 11 is a lantern-shaped cylinder 12 of several layers with the same height. Adjacent lantern-shaped cylinders 12 maintain a certain interval. Water can pass through the sand washer 11 from bottom to top, and filter sand can also pass through the sand washer 11 from top to bottom through the interval. Water and filter sand are in tumbling contact between adjacent lantern-shaped cylinders 12 to further clean the filter sand and ensure the flushing effect of the filter sand. The air ejector 21 inhales air through a pressurized sewage jet, which is a mature technology. The use of the air ejector 21 to inhale air technology can save the configuration of a large air compressor in the sand lifting process, save cost and energy consumption, and save the maintenance steps of the large air compressor, saving manpower and cost; the power source of the sand blasting ejector 25 is the gas from the pulse gas-water separator 2. The pulsation frequency of the pulse gas-water separator 2 is determined by the starting pressure of the one-way valve 27 on the gas phase pipe 24 and the liquid phase pipe 26. The sewage flowing out of the pulse gas-water separator 2 is connected to the filter tower 1 through the liquid phase pipe 26 for filtration through the filter sand. The gas discharged from the pulse gas-water separator 2 then drives the filter sand to be transported from the sand lifting pipe 16 to the sand washing tank 14 and the sand washer 11 for sand washing. The reciprocating cycle of filtering water and washing sand keeps the entire equipment running, saving maintenance costs. The fully automatic continuous pulse operation greatly improves the sand filtration efficiency of sewage deep treatment. During specific operation, the position of the de-resting angle cone disk 6 must be adjusted to a suitable position to ensure that the filter sand leaking from the de-resting angle cone disk 6 does not block the sand suction port 9 on the bottom sand outlet pipe 8 for sucking dirty sand; the sewage jet pipe section of the air ejector 21 should be designed to be a vertical section length with a certain height to ensure the strength of the jet suction air. The lantern-shaped cylinder 12 can be set as follows Figure 3 The bent cylinder shown in the figure further forms a multi-layered annular gap between the lantern-shaped cylinders 12 .

[0027] The working principle of the pulse continuous sand filtering device described in the present invention is: the pressurized sewage enters the pulse gas-water separator 2 from the sewage inlet pipeline 20, the gas enters the pulse gas-water separator 2 together with the air ejector 21, and then the gas and liquid are separated in the pulse gas-water separator 2, the gas is discharged from the gas phase outlet 22 through the gas phase pipe 24, and the sewage is discharged evenly from the water distributor 5 in the filter tower 1 through the liquid phase pipe 26 from the liquid phase outlet 23, the sewage first flows downward, and after the cylinder 3 and the lower head 4 under the water distributor 5 are full, the sewage gradually flows upward, passes through the filter sand, and overflows from the top of the cylinder 3 to the clean water tank 17 from the space outside the sand washer 11 and inside the cylinder 3, and is discharged from the clean water tank 17, the gas of the pulse gas-water separator 2 is connected to the sand lifting pipe 16 through the gas phase pipe 24, and under the action of the sandblasting ejector 25, the sewage in the lower head 4 The filter sand near the sand suction port 9 is sucked out and lifted from the sand lifting pipe 16 to the sand washing tank 14. The clean water after passing through the filter sand rises from the bottom of the sand washing device 11. The filter sand falls by its own weight and contacts with the clean filter water rising in the reverse pulsation, which further cleans the filter sand and ensures the flushing effect of the filter sand. After being cleaned, the filter sand falls in the cylinder 3 by its own weight and continues to be filtered. The sewage used to clean the filter sand continues to rise and is discharged from the backwash water outlet 19 of the sand washing tank 14. The whole cleaning process is repeated, and the filter tank does not need to stop running. Backwashing and filtering are carried out at the same time, avoiding complex piping structures and the operation of switching valves, thereby avoiding the maintenance of switching valves. The process is simple, avoiding the influence of human operation factors on the water filtration system, ensuring the operation cycle and effluent water quality, and does not need to rely on the introduction of high-cost equipment, reducing unnecessary energy consumption.

[0028] Further, as a specific embodiment of the pulse continuous sand filtering device described in the present invention, Figure 1 As shown, the liquid phase pipe 26 outside the liquid phase outlet 23 is configured as a U-shaped pipe section to form a water seal at the bottom of the pulse gas-water separator 2. The water seal of appropriate height is retained to ensure that the gas phase inside the pulsating gas-water separator does not enter the liquid phase pipe 26, thereby ensuring the stability of sandblasting.

[0029] Further, as a specific embodiment of the pulse continuous sand filtering device described in the present invention, Figure 1 As shown, a drain outlet is provided at the lowest point of the liquid phase pipe 26, and a stop valve 28 is provided on the drain outlet. This arrangement is to discharge the liquid phase pipe 26 after a certain period of time, to ensure the smoothness of the liquid phase pipe 26, and then to ensure the smooth filtration of the filter tower 1. Such a structure is more reasonable and convenient and simple to maintain.

[0030] Further, as a specific embodiment of the pulse continuous sand filtering device described in the present invention, Figure 1As shown, the sand lifting pipe 16 extends vertically downward from the sand washing tank to the bottom of the filter tower 1, the sand blasting ejector 25 is arranged horizontally opposite to the sand outlet 7, and the sand lifting pipe 16 is connected to the gas phase pipe 24 and further extends downward to a terminal pipe, on which a stop valve 28 is arranged. This is to regularly clean and conduct the sand lifting pipe 16 for easy maintenance and overhaul.

[0031] Further, as a specific embodiment of the pulse continuous sand filtering device described in the present invention, Figure 1 As shown, the cone disk 6 with the angle of repose removed is a cone disk with the tip facing upward, and the angle of the cone disk is equal to the angle of repose of the filter sand naturally stacked, which ensures that the filter sand filtering section is dynamically equal in thickness.

[0032] Further, as a specific embodiment of the pulse continuous sand filtering device described in the present invention, Figure 4 As shown, the levers 13 at the top and bottom of the lantern-shaped cylinder 12 are arranged in a cross shape. This arrangement is to make the connection between the lantern-shaped cylinders 12 more secure, so that the structure of the sand washer 11 is stable.

[0033] Further, as a specific embodiment of the pulse continuous sand filtering device described in the present invention, Figure 1 As shown, a reinforcing support structure is provided between the bottom of the clean water tank 17 and the outer wall of the cylinder 3. This is to make the structure more firm, stable and reasonable.

[0034] Further, as a specific embodiment of the pulse continuous sand filtering device described in the present invention, Figure 1 As shown, the outer portion of the lower head 4 is provided with supporting legs 31 for supporting the filter tower 1. This is to make the structure more stable and reasonable.

[0035] The above specific structure is a specific description of the preferred embodiment of the present invention, but the invention is not limited to the embodiment. Those skilled in the art can make various equivalent deformations or substitutions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A pulse continuous sand filter device, characterized in that: The invention comprises a filter tower (1) and a pulse gas-water separator (2), wherein the filter tower (1) comprises a cylinder (3) and a lower end cover (4) connected to the lower end of the cylinder (3), a water distributor (5) is horizontally arranged in the lower part of the cylinder (3), a de-resting angle cone disk (6) is supported between the cylinder wall of the cylinder (3) below the water distributor (5), a sand outlet (7) is opened on the cylinder wall of the cylinder (3) below the de-resting angle cone disk (6), a sand outlet (7) is sealed and connected to the sand outlet (7), a sand outlet pipe (8) is sealed and connected to the sand outlet (7), a sand suction port (9) of the sand outlet pipe (8) extends to the vicinity of the bottom of the lower end cover (4), a sand washer (11) is supported in the upper part of the cylinder (3) through a bracket (10), and a sand washer (11) is located in the sand washer (11) ) below the cylinder (3) and the lower head (4) are filled with filter sand, the sand washer (11) is formed by a plurality of layers of lantern-shaped cylinders (12) of equal height being concentrically nested, the cylinder walls of adjacent lantern-shaped cylinders (12) being spaced apart by sand falling gaps, the top and bottom of the lantern-shaped cylinders (12) being respectively fixedly connected with a stopper rod (13) for connecting all the lantern-shaped cylinders (12); a clean water trough (17) is circumferentially extended on the outer side of the top of the cylinder (3), a sand washing trough (14) connected to the sand washer (11) is arranged above the sand washer (11), the top of the sand washing trough (14) is higher than the tops of the cylinder (3) and the clean water trough (17), and a backwash water trough (14) is arranged on the sand washing trough (14) The filter tower (1) further comprises a sand lifting pipe (16), one end of which is placed in the sand washing tank (14), a sand blasting ejector (25) is arranged on the body of the sand lifting pipe (16), and the end of the outer end of the sand outlet pipe (8) is connected to the sand lifting pipe (16) through the sand blasting ejector (25); the pulse gas-water separator (2) is connected to a sewage inlet pipeline (20), and an air ejector (21) for inhaling air is arranged on the sewage inlet pipeline (20); the top and bottom of the pulse gas-water separator (2) are respectively provided with a gas phase outlet (22) and a liquid phase outlet (23), and the gas phase outlet (22) is connected to the sand lifting pipe (1) through a gas phase pipe (24). The other end of the filter tower (6) is connected, the liquid phase outlet (23) is connected to the water distributor (5) of the filter tower (1) through the liquid phase pipe (26), and the gas phase pipe (24) and the liquid phase pipe (26) are both provided with a one-way valve (27) with a certain starting pressure; the liquid phase pipe (26) outside the liquid phase outlet (23) is arranged to form a U-shaped pipe section so that a water seal is formed at the bottom of the pulse gas-water separator (2); the sand lifting pipe (16) extends from the sand washing tank and then extends vertically downward to the bottom of the filter tower (1), the sand blasting ejector (25) and the sand outlet (7) are arranged horizontally opposite to each other, and the sand lifting pipe (16) is connected to the gas phase pipe (24) and further extends downward to have a terminal pipe, and a stop valve (28) is provided on the terminal pipe.

2. A pulse continuous sand filter device according to claim 1, characterized in that: A sewage discharge pipe opening is also provided at the lowest point of the liquid phase pipe (26), and a stop valve (28) is provided on the sewage discharge pipe opening.

3. A pulse continuous sand filter device according to claim 1, characterized in that: The top of the cylinder (3) is lower than the top of the clean water tank (17).

4. A pulse continuous sand filter device according to any one of claims 1 to 3, characterized in that: The repose angle cone disk (6) is a cone disk with the tip facing upward, and the angle of the cone disk is equal to the repose angle of the filter sand naturally piled up.

5. A pulse continuous sand filtering device according to claim 4, characterized in that: A manhole (29) and a discharge hole (30) are provided on the cylinder (3).

6. A pulse continuous sand filtering device according to claim 5, characterized in that: The gear levers (13) at the top and bottom of the lantern-shaped cylinder (12) are arranged in a cross shape.

7. A pulse continuous sand filter device according to claim 6, characterized in that: A reinforcing support structure is provided between the bottom of the clean water tank (17) and the outer wall of the cylinder (3).

8. A pulse continuous sand filtering device according to claim 7, characterized in that: Support legs (31) for supporting the filter tower (1) are arranged outside the lower head (4).

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