CN217202453U - MBBR integration sewage treatment device - Google Patents

Abstract

The utility model relates to the technical field of sewage treatment, in particular to an MBBR integrated sewage treatment device which improves the effect of dirt cleaning, improves the cleaning efficiency and reduces the labor intensity of manual cleaning; including the rose box, closing device, the inlet tube, the drain pipe, the filter screen, first straw, the second straw, the delivery box, first motor, the sludge pump, the rose box bottom is provided with the opening, the inlet tube intercommunication sets up on rose box upper portion, the drain pipe intercommunication sets up in the rose box lower part, the filter screen sets up at the rose box middle part, closing device sets up at the rose box opening part, and closing device supports fixedly to the filter screen bottom, first straw bottom is provided with logical groove, first straw top is connected with second straw bottom, the delivery box is installed on the rose box top, second straw top stretches into inside the delivery box, and second straw top and delivery box inside wall swivelling joint, second straw upper portion is provided with the through-hole, the second straw communicates with each other through-hole and delivery box in.

Description

MBBR integration sewage treatment device

Technical Field

The utility model relates to a sewage treatment's technical field especially relates to a MBBR integration sewage treatment device.

Background

MBBR is a novel biofilm reactor, which is an improved novel composite biofilm reactor developed on the basis of a fixed bed reactor, a fluidized bed reactor and a biological filter, overcomes the defects that the fixed bed reactor needs regular back flushing, the fluidized bed reactor needs to fluidize a carrier, a submerged biological filter needs to be cleaned of filter materials and complex operation of aerator replacement, and also keeps the characteristics of impact load resistance, low sludge yield and long sludge age of the traditional biofilm method, because most of sewage contains large-particle dirt, the sewage needs to be pre-filtered before being treated by the MBBR, the prior MBBR integrated sewage treatment equipment finds that the equipment is not convenient for automatic cleaning of the filtered dirt of the sewage, and the manual cleaning of the dirt wastes time and labor, thereby providing a novel composite biofilm reactor convenient for automatic cleaning of the dirt, reduce the sewage treatment device of the artifical clearance degree of difficulty.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an improve the effect of dirt clearance, improve cleaning efficiency, reduce the MBBR integration sewage treatment device of the intensity of labour of artifical clearance.

The utility model discloses an MBBR integrated sewage treatment device, which comprises a filter box, a sealing device, a water inlet pipe, a drain pipe, a filter screen, a first suction pipe, a second suction pipe, a conveying box, a first motor and a sludge pump, wherein the bottom end of the filter box is provided with an opening, the water inlet pipe is communicated with the upper part of the filter box, the drain pipe is communicated with the lower part of the filter box, the filter screen is arranged in the middle part of the filter box, the sealing device is arranged at the opening part of the filter box, the sealing device supports and fixes the bottom end of the filter screen, the bottom end of the first suction pipe is provided with a through groove, the top end of the first suction pipe is connected with the bottom end of the second suction pipe, the conveying box is arranged at the top end of the filter box, the top end of the second suction pipe extends into the conveying box, the top end of the second suction pipe is rotationally connected with the inner side wall of the conveying box, the upper part of the second suction pipe is provided with a through hole, the first motor is arranged at the top end of the conveying box, the output end of the first motor is concentrically connected with the top end of the second suction pipe, the sludge pump is installed at the top end of the filter box, the input end of the sludge pump is communicated with the conveying box, and the output end of the sludge pump is communicated with external dirt treatment equipment; the sewage to be treated is discharged into the filter box through the water inlet pipe, the sewage entering the filter box passes through the filter screen and flows downwards, the sewage is discharged outwards through the drain pipe, the sewage is filtered through the filter screen in the flowing process, so that the massive dirt in the sewage is reduced, the convenience of sewage treatment by the MBBR in the later period is improved, the load of sewage treatment in the later period is reduced, the filtered dirt is deposited at the top end of the filter screen, when the dirt needs to be cleaned, the water inlet pipe is firstly closed, then the sludge pump is opened to pump the conveying box, the conveying box pumps the first suction pipe through the second suction pipe, so that the dirt deposited at the top end of the filter screen is sucked by the first suction pipe, the sucked dirt enters the conveying box through the second suction pipe, then the dirt in the conveying box is conveyed and discharged to the external dirt treatment equipment through the sludge pump, and the second suction pipe is driven to rotate by opening the first motor, the rotatory back of second straw drives first straw and rotates to make first straw rotate the in-process and absorb the dirt on filter screen top, improve the effect of dirt clearance, improve cleaning efficiency, reduce the intensity of labour of artifical clearance.

Preferably, the sealing device comprises a sealing cover, support rods, connecting rods, a bottom plate, support seats, slide blocks, support plates and multi-stage hydraulic cylinders, the sealing cover is arranged at an opening at the bottom end of the filter box and seals the opening of the filter box, the bottoms of the support rods are all connected with the top end of the sealing cover, a filter screen is arranged at the top end of the support rods, the connecting rods are circumferentially arranged on the outer side wall of the lower part of the filter box, the sealing cover is connected with the connecting rods through bolts, the top end of the bottom plate is connected with the bottoms of the two groups of support seats, slide grooves are respectively arranged in the two groups of support seats, the two groups of slide blocks are respectively arranged on the slide grooves of the two groups of support seats in a vertical sliding manner, the rear ends of the two groups of support plates are respectively connected with the outer side walls of the two groups of slide blocks, the front ends of the two groups of support the support plates respectively at the bottom ends of the sealing cover, the two groups of multi-stage hydraulic cylinders are respectively arranged on the inner side walls of the two groups of the slide grooves, the moving ends of the two groups of multi-stage hydraulic cylinders are respectively connected with the bottom ends of the two groups of sliding blocks; support the filter screen bottom through setting up the multiunit bracing piece, improve the fixed effect in filter screen position, remove when sealed lid dismantles the back downwards, make the multiunit bracing piece drive the filter screen and remove downwards, improve the convenience that the filter screen took out the outside change of rose box, remove the flexible length of end through controlling two sets of multistage pneumatic cylinders, make two sets of multistage pneumatic cylinders drive two sets of sliders and upwards or move downwards, make two sets of sliders drive sealed lid through two sets of layer boards and reciprocate, improve the operation convenience when sealed lid is dismantled or is installed, reduce the intensity of labour that personnel removed sealed lid transport, improve equipment maintenance efficiency, improve the practicality.

Preferably, the device also comprises an annular water pipe, spray heads, a connecting pipe, a first water pump, a water tank, a second water pump and a dosing device, wherein the annular water pipe is arranged on the upper part of the inner side wall of the filter tank, a plurality of groups of spray heads are circumferentially communicated and arranged on the lower part of the annular water pipe, the output ends of the plurality of groups of spray heads are communicated with the inside of the filter tank, the output end of the connecting pipe is communicated with the inside of the annular water pipe, the input end of the connecting pipe is communicated with the output end of the first water pump, the first water pump is arranged on the outer side wall of the water tank, the input end of the first water pump is communicated with the inside of the water tank, the input end of the second water pump is communicated with an external water source, the output end of the second water pump is communicated with the inside of the water tank, the dosing device is arranged on the outer side wall of the water tank, and the output end of the dosing device is communicated with the inside of the water tank; inside the second water pump will outdoor water source extraction and carry to the water tank, will clear up the medicament through charge device and add inside the water tank, make water and washing medicament mix, later through opening the water extraction of first water pump in with the water tank, make the water of extraction carry to the annular water pipe inside through the connecting pipe, later spray the top surface to the filter screen through the multiunit shower nozzle with water, thereby wash when making first straw clear up the filter screen dirt, improve equipment's clean effect of dirt clearance.

Preferably, the water tank further comprises a second motor and a stirring paddle, the second motor is mounted on the outer side wall of the water tank, the stirring paddle is arranged inside the water tank, the right end of the stirring paddle is concentrically connected with the output end of the second motor, and sealing filler is arranged at the joint of the right end of the stirring paddle and the inner side wall of the water tank; the second motor is opened to drive the stirring paddle to rotate, so that water in the water tank is mixed and stirred by the stirring paddle, the mixing uniformity of the water and the washing agent is improved, and the washing effect of the filter screen is improved.

Preferably, the filter box further comprises two groups of scraping plates, wherein the two groups of scraping plates are respectively arranged at the left part and the right part of the top end of the first suction pipe, and the two groups of scraping plates are respectively attached to the inner side wall of the filter box; the rotatory back of first suction pipe drives two sets of scrapers and rotates, makes two sets of scrapers rotate the in-process and clears up the rose box inside wall, improves the adnexed dirt clearance convenience of rose box inside wall.

Preferably, the filter box further comprises an observation window, the observation window is arranged on the outer side wall of the filter box, and the observation window is communicated with the inside of the filter box; through setting up the observation window, improve the inside convenience of observing of rose box to be convenient for in time clear up the filter screen, improve the convenience that equipment was in time maintained.

Compared with the prior art, the beneficial effects of the utility model are that: the sewage to be treated is discharged into the filter box through the water inlet pipe, the sewage entering the filter box passes through the filter screen and flows downwards, the sewage is discharged outwards through the drain pipe, the sewage is filtered through the filter screen in the flowing process, so that the massive dirt in the sewage is reduced, the convenience of sewage treatment by the MBBR in the later period is improved, the load of sewage treatment in the later period is reduced, the filtered dirt is deposited at the top end of the filter screen, when the dirt needs to be cleaned, the water inlet pipe is firstly closed, then the sludge pump is opened to pump the conveying box, the conveying box pumps the first suction pipe through the second suction pipe, so that the dirt deposited at the top end of the filter screen is sucked by the first suction pipe, the sucked dirt enters the conveying box through the second suction pipe, then the dirt in the conveying box is conveyed and discharged to the external dirt treatment equipment through the sludge pump, and the second suction pipe is driven to rotate by opening the first motor, the rotatory back of second straw drives first straw and rotates to make first straw rotate the in-process and absorb the dirt on filter screen top, improve the effect of dirt clearance, improve cleaning efficiency, reduce the intensity of labour of artifical clearance.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a partial schematic view showing the connection of a filter box to a sealing lid or the like;

FIG. 3 is a schematic view of a portion of the axial structure of the connection of a first suction pipe with a second suction pipe;

FIG. 4 is a partial schematic view of the second motor connected to a paddle or the like;

in the drawings, the reference numbers: 1. a filter box; 2. a water inlet pipe; 3. a drain pipe; 4. a filter screen; 5. a first straw; 6. a second straw; 7. a delivery box; 8. a first motor; 9. a sludge pump; 10. a sealing cover; 11. a support bar; 12. a connecting member; 13. a base plate; 14. a supporting seat; 15. a slider; 16. a support plate; 17. a multi-stage hydraulic cylinder; 18. an annular water pipe; 19. a connecting pipe; 20. a first water pump; 21. a water tank; 22. a second water pump; 23. a dosing device; 24. a second motor; 25. a stirring paddle; 26. a squeegee; 27. an observation window; 28. and (4) a spray head.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The bottom end of the filter box 1 is provided with an opening, the water inlet pipe 2 is communicated and arranged at the upper part of the filter box 1, the drain pipe 3 is communicated and arranged at the lower part of the filter box 1, the filter screen 4 is arranged at the middle part of the filter box 1, the bottom end of the first suction pipe 5 is provided with a through groove, the top end of the first suction pipe 5 is connected with the bottom end of the second suction pipe 6, the conveying box 7 is arranged at the top end of the filter box 1, the top end of the second suction pipe 6 extends into the conveying box 7, the top end of the second suction pipe 6 is rotationally connected with the inner side wall of the conveying box 7, the upper part of the second suction pipe 6 is provided with a through hole, the second suction pipe 6 is communicated with the conveying box 7 through the through hole, the first motor 8 is arranged at the top end of the conveying box 7, the output end of the first motor 8 is concentrically connected with the top end of the second suction pipe 6, the sludge pump 9 is arranged at the top end of the filter box 1, the input end of the sludge pump 9 is communicated with the conveying box 7, the output end of the sludge pump 9 is communicated with external dirt treatment equipment, the sealing cover 10 is arranged at the bottom opening of the filter box 1, the sealing cover 10 seals the opening of the filter box 1, the bottoms of a plurality of groups of support rods 11 are connected with the top end of the sealing cover 10, the filter screen 4 is arranged at the top end of the plurality of groups of support rods 11, a plurality of groups of connecting rods 12 are circumferentially arranged on the outer side wall of the lower part of the filter box 1, the sealing cover 10 is connected with the plurality of groups of connecting rods 12 through a plurality of groups of bolts, the top end of the bottom plate 13 is connected with the bottoms of two groups of supporting seats 14, sliding grooves are respectively arranged in the two groups of supporting seats 14, two groups of sliders 15 are respectively arranged on the sliding grooves of the two groups of supporting seats 14 in a vertical sliding manner, the rear ends of two groups of supporting plates 16 are respectively connected with the outer side walls of two groups of sliders 15, the front ends of two groups of supporting plates 16 are respectively supported at the bottom end of the sealing cover 10, the fixed ends of two groups of multistage hydraulic cylinders 17 are respectively arranged on the inner side walls of the two groups of sliding grooves, and the movable ends of two groups of multistage hydraulic cylinders 17 are respectively connected with the bottoms of the sliders 15, the annular water pipe 18 is arranged on the upper part of the inner side wall of the filter box 1, a plurality of groups of spray heads 28 are circumferentially communicated and arranged on the lower part of the annular water pipe 18, the output ends of the plurality of groups of spray heads 28 are communicated with the inside of the filter box 1, the output end of a connecting pipe 19 is communicated with the inside of the annular water pipe 18, the input end of the connecting pipe 19 is communicated with the output end of a first water pump 20, the first water pump 20 is arranged on the outer side wall of a water tank 21, the input end of the first water pump 20 is communicated with the inside of the water tank 21, the input end of a second water pump 22 is communicated with an external water source, the output end of the second water pump 22 is communicated with the inside of the water tank 21, a medicine adding device 23 is arranged on the outer side wall of the water tank 21, an output end of the medicine adding device 23 is communicated with the inside of the water tank 21, a second motor 24 is arranged on the outer side wall of the water tank 21, a stirring paddle 25 is arranged inside the water tank 21, the right end of the stirring paddle 25 is concentrically connected with the output end of the second motor 24, and sealing filler is arranged on the inner side wall of the stirring paddle 25, two groups of scraping plates 26 are respectively arranged at the left part and the right part of the top end of the first suction pipe 5, the two groups of scraping plates 26 are respectively attached to the inner side wall of the filter box 1, the observation window 27 is arranged on the outer side wall of the filter box 1, and the observation window 27 is communicated with the inside of the filter box 1; the sewage to be treated is discharged into the filter box 1 through the water inlet pipe 2, the sewage entering the filter box 1 passes through the filter screen 4 and flows downwards, the sewage is discharged outwards through the drain pipe 3, the sewage is filtered through the filter screen 4 in the flowing process, so that the massive dirt in the sewage is reduced, the convenience of sewage treatment by the MBBR in the later period is improved, the load of sewage treatment in the later period is reduced, the filtered dirt is deposited at the top end of the filter screen 4, when the dirt needs to be cleaned, the water inlet pipe 2 is firstly closed, then the sludge pump 9 is opened to pump the conveying box 7, the conveying box 7 pumps the first suction pipe 5 through the second suction pipe 6, the dirt deposited at the top end of the filter screen 4 is sucked by the first suction pipe 5, the sucked dirt enters the conveying box 7 through the second suction pipe 6, and then the dirt in the conveying box 7 is conveyed to the external dirt treatment equipment through the sludge pump 9 and discharged, simultaneously, the first motor 8 is opened to drive the second suction pipe 6 to rotate, and the second suction pipe 6 rotates to drive the first suction pipe 5 to rotate, so that the first suction pipe 5 absorbs the dirt on the top end of the filter screen 4 in the rotating process, the dirt cleaning effect is improved, the cleaning efficiency is improved, and the labor intensity of manual cleaning is reduced.

As shown in fig. 1 to 4, in the utility model, when in operation, sewage to be treated is discharged into the filter box 1 through the water inlet pipe 2, the sewage entering the filter box 1 flows downwards through the filter screen 4, so that the sewage is discharged outwards through the water discharge pipe 3, the sewage is filtered through the filter screen 4 in the flowing process, when dirt needs to be cleaned, the water inlet pipe 2 is firstly closed, then the sludge pump 9 is opened to pump the conveying box 7, the conveying box 7 pumps the first suction pipe 5 through the second suction pipe 6, so that the dirt deposited at the top end of the filter screen 4 is sucked by the first suction pipe 5, the sucked dirt enters the conveying box 7 through the second suction pipe 6, then the dirt in the conveying box 7 is conveyed outwards through the sludge pump 9 to be discharged, and simultaneously the first suction pipe 6 is driven to rotate by opening the first motor 8, the second suction pipe 6 rotates to drive the first suction pipe 5 to rotate, so that the first suction pipe 5 sucks dirt on the top end of the filter screen 4 in the rotating process, then the seal cover 10 moves downwards after being disassembled, a plurality of groups of support rods 11 drive the filter screen 4 to move downwards, the two groups of multi-stage hydraulic cylinders 17 drive two groups of sliders 15 to move upwards or downwards by controlling the telescopic length of the moving ends of the two groups of multi-stage hydraulic cylinders 17, so that the two groups of sliders 15 drive the seal cover 10 to move upwards and downwards through two groups of support plates 16, then the second water pump 22 extracts an outdoor water source and conveys the water source to the inside of the water tank 21, cleaning agents are added into the water tank 21 through the chemical adding device 23 to mix water with the cleaning agents, then the first water pump 20 is opened to extract water in the water tank 21, the extracted water is conveyed to the inside of the annular water pipe 18 through the connecting pipe 19, and then the water is sprayed to the top surface of the filter screen 4 through a plurality of spray nozzles 28, so that the first suction pipe 5 can wash the filter screen 4 when cleaning dirt.

The utility model discloses the main function who realizes does: when needs are cleared up the dirt, at first close inlet tube 2, later open sludge pump 9 and bleed in to delivery box 7, make delivery box 7 bleed through second straw 6 to first straw 5, thereby make first straw 5 absorb the sedimentary dirt in filter screen 4 top, the dirt of absorption passes through inside second straw 6 gets into delivery box 7, later the dirt in delivery box 7 passes through sludge pump 9 and carries the emission to outside dirt treatment facility, it is rotatory to drive second straw 6 simultaneously through opening first motor 8, drive first straw 5 rotation after second straw 6 is rotatory, thereby make first straw 5 rotate the dirt absorption of in-process to filter screen 4 top, the effect of dirt clearance is improved, the cleaning efficiency is improved, the intensity of labour of manual cleaning is reduced.

The utility model discloses an MBBR integrated sewage treatment device, the installation mode, the connection mode or the setting mode of which are common mechanical modes, and the MBBR integrated sewage treatment device can be implemented as long as the beneficial effects can be achieved; the utility model discloses a MBBR integration sewage treatment device's first motor 8, sludge pump 9, multistage pneumatic cylinder 17, first water pump 20, second water pump 22, charge device 23 and second motor 24 are purchase on the market, and this industry technical staff only need install and operate according to its subsidiary instructions, and need not the technical staff in this field and pay out creative work.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (6)

1. An MBBR integrated sewage treatment device is characterized by comprising a filter box (1), a sealing device, a water inlet pipe (2), a drain pipe (3), a filter screen (4), a first suction pipe (5), a second suction pipe (6), a conveying box (7), a first motor (8) and a sludge pump (9), wherein the bottom end of the filter box (1) is provided with an opening, the water inlet pipe (2) is communicated and arranged at the upper part of the filter box (1), the drain pipe (3) is communicated and arranged at the lower part of the filter box (1), the filter screen (4) is arranged at the middle part of the filter box (1), the sealing device is arranged at the opening of the filter box (1), the sealing device supports and fixes the bottom end of the filter screen (4), the bottom end of the first suction pipe (5) is provided with a through groove, the top end of the first suction pipe (5) is connected with the bottom end of the second suction pipe (6), the conveying box (7) is arranged at the top end of the filter box (1), inside second straw (6) top stretched into delivery box (7), and second straw (6) top and delivery box (7) inside wall swivelling joint, second straw (6) upper portion is provided with the through-hole, second straw (6) communicate with each other in through-hole and delivery box (7), install on delivery box (7) top first motor (8), first motor (8) output and second straw (6) top are connected with one heart, install on rose box (1) top sludge pump (9), intercommunication in sludge pump (9) input and the delivery box (7), sludge pump (9) output and outside dirt treatment facility intercommunication.

2. The MBBR integrated sewage treatment equipment according to claim 1, wherein the sealing device comprises a sealing cover (10), support rods (11), connecting rods (12), a bottom plate (13), support seats (14), sliders (15), a supporting plate (16) and multi-stage hydraulic cylinders (17), the sealing cover (10) is installed at the opening at the bottom end of the filter box (1), the sealing cover (10) seals the opening of the filter box (1), the bottom ends of a plurality of groups of the support rods (11) are all connected with the top end of the sealing cover (10), the filter screen (4) is installed at the top end of a plurality of groups of the support rods (11), a plurality of groups of the connecting rods (12) are all circumferentially arranged on the outer side wall of the lower part of the filter box (1), the sealing cover (10) is connected with a plurality of groups of the connecting rods (12) through a plurality of bolts, the top end of the bottom plate (13) is connected with the bottom ends of two groups of the support seats (14), sliding grooves are respectively arranged in the two groups of the support seats (14), two sets of sliders (15) slide respectively from top to bottom and are arranged on the sliding grooves of two sets of supporting seats (14), the rear ends of two sets of supporting plates (16) are respectively connected with the outer side walls of the two sets of sliders (15), the front ends of the two sets of supporting plates (16) are respectively supported at the bottom ends of the sealing covers (10), the fixed ends of two sets of multistage hydraulic cylinders (17) are respectively arranged on the inner side walls of the two sets of sliding grooves, and the moving ends of the two sets of multistage hydraulic cylinders (17) are respectively connected with the bottom ends of the two sets of sliders (15).

3. The MBBR integrated sewage treatment equipment according to claim 1, further comprising an annular water pipe (18), spray heads (28), a connecting pipe (19), a first water pump (20), a water tank (21), a second water pump (22) and a dosing device (23), wherein the annular water pipe (18) is installed on the upper portion of the inner side wall of the filter tank (1), a plurality of groups of spray heads (28) are circumferentially communicated and arranged on the lower portion of the annular water pipe (18), the output ends of the plurality of groups of spray heads (28) are communicated with the inside of the filter tank (1), the output end of the connecting pipe (19) is communicated with the inside of the annular water pipe (18), the input end of the connecting pipe (19) is communicated with the output end of the first water pump (20), the first water pump (20) is installed on the outer side wall of the water tank (21), the input end of the first water pump (20) is communicated with the inside of the water tank (21), and the input end of the second water pump (22) is communicated with an external water source, the output end of the second water pump (22) is communicated with the inside of the water tank (21), the dosing device (23) is arranged on the outer side wall of the water tank (21), and the output end of the dosing device (23) is communicated with the inside of the water tank (21).

4. The MBBR integrated sewage treatment device of claim 3, further comprising a second motor (24) and a stirring paddle (25), wherein the second motor (24) is installed on the outer side wall of the water tank (21), the stirring paddle (25) is arranged inside the water tank (21), the right end of the stirring paddle (25) is concentrically connected with the output end of the second motor (24), and a sealing filler is arranged at the joint of the right end of the stirring paddle (25) and the inner side wall of the water tank (21).

5. The MBBR integrated sewage treatment equipment according to claim 1, further comprising two groups of scrapers (26), wherein the two groups of scrapers (26) are respectively installed at the left and right parts of the top end of the first suction pipe (5), and the two groups of scrapers (26) are respectively attached to the inner side wall of the filter box (1).

6. An MBBR integrated sewage treatment plant according to claim 1, further comprising a viewing window (27), wherein the viewing window (27) is arranged on the outer side wall of the filter tank (1), and the viewing window (27) is communicated with the inside of the filter tank (1).

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