CN220000462U - Pollution discharge filter device for prawn culture - Google Patents

Abstract

The utility model discloses a sewage draining and filtering device for shrimp culture, which comprises a culture pond and a net cage, wherein the lower end of the culture pond is fixedly connected with a lower sewage bin, the lower end of the lower sewage bin is vertically and fixedly connected with a lower sewage pipe which is communicated with the lower sewage bin, a first switch valve is arranged on the lower sewage pipe, the lower end of the lower sewage pipe is fixedly connected with a sewage storage bin, the inner bottom end of the sewage storage bin is provided with a sewage drain, the sewage drain is fixedly connected with a communicated sewage drain pipe, the lower end of the sewage drain pipe is connected with a second switch valve, the inside of the sewage storage bin is fixedly connected with a vertical baffle, the upper part of the vertical baffle is provided with a filtering hole, one side of the sewage storage bin is fixedly connected with a water pump, the input end of the water pump is fixedly connected with a water inlet pipe, the output end of the water pump is fixedly connected with a water outlet pipe, the filter screen of the prior device is horizontally arranged, the filter screen is easy to block, when the sewage is crushed, the sewage and the sewage is mixed to form sewage, the sewage cannot be discharged in time, and the effect on the survival of shrimps in the culture pond is easy.

Description

Pollution discharge filter device for prawn culture

Technical Field

The utility model belongs to the technical field of aquaculture, and particularly relates to a sewage filtering device for prawn culture.

Background

In recent years, the demands of people on prawns are increasing, but along with the increasing and decreasing ecology in field environment, the supply of wild prawns is not required, the prawns are artificially cultured by a raiser, the prawns are cultured in a mode of rough culture, fine culture, high-density fine culture and the like, the young prawns are put in middle and small natural water areas, aquatic products are cultured by completely relying on natural baits, such as fish culture in a lake reservoir, shellfish culture and the like, the fine culture is carried out in a smaller water body by a bait casting and fertilizing method, such as fish culture in a pond, fish culture in a net cage, rail culture and the like, the high-density fine culture adopts a method of running water, temperature control, oxygenation, high-quality bait feeding and the like, and the high-density culture is carried out in a small water body, such as running water high-density fish culture, shrimp and the like, filtering pollution discharge is needed in the culture process, and the culture environment is ensured.

According to the sewage disposal device for the shrimp culture pond disclosed in the Chinese patent document with the publication number of CN213427817U, the sewage disposal device comprises a culture pond, a sewage disposal pipe and a sewage disposal box symmetrically arranged on two sides in the culture pond, wherein a baffle is arranged on the inner wall of the culture pond close to the bottom of the pond, a second motor is arranged at the bottom end of the culture pond, a mounting hole is formed in the baffle, a second filter screen is arranged on the baffle, the second motor is connected with a saw-tooth stirring blade through a motor shaft, the saw-tooth stirring blade is arranged in the mounting hole formed in the baffle, the sewage disposal box is of a rectangular box structure, a sewage disposal bin is arranged in the sewage disposal box, a first filter screen is symmetrically arranged in the sewage disposal bin, an adsorption box is arranged in the sewage disposal bin, an active carbon plate is arranged in the adsorption box, the adsorption box is arranged between the first filter screens, a connecting ring is arranged at the center of the upper end face of the sewage disposal box, the sewage disposal device for the shrimp culture is reasonable in structure, and the arrangement of the active carbon is convenient for removing fine sewage, and the sewage is high in practicality.

Based on the retrieval of above-mentioned patent to and combining the equipment discovery among the prior art, above-mentioned equipment filter screen level sets up when using, and the filth that saw tooth stirring leaf was smashed is piled up and is made the filter screen easily to be plugged up, and saw tooth stirring leaf smashes partial filth, makes filth and rivers mix and forms sewage, and sewage can't in time discharge, and the shrimp survives in the easy to the breed pond and leads to the fact the influence.

Disclosure of Invention

Aiming at the problems existing in the prior art, the utility model provides a sewage draining and filtering device for prawn culture, and the vertically arranged vertical baffle plate has the advantages of separating sewage from sewage, rapidly discharging the sewage and being convenient for collecting the sewage, solves the problems that the filter screen of the existing equipment is horizontally arranged, the filter screen is easy to block, when the sewage is crushed, the sewage and water flow are mixed to form the sewage, the sewage cannot be discharged in time, and the survival of prawns in a culture pond is easy to be influenced.

The utility model discloses a sewage filtering device for prawn culture, which comprises a culture pond and a net cage, wherein the lower end of the culture pond is fixedly connected with a lower sewage bin, the lower end of the lower sewage bin is vertically and fixedly connected with a communicated lower sewage pipe, a first switch valve is arranged on the lower sewage pipe, the lower end of the lower sewage pipe is fixedly connected with a sewage storage bin, and a stirring mechanism for stirring crushed sewage to facilitate the discharge of the sewage and an inclined mechanism for facilitating the falling of the sewage are arranged in the sewage storage bin;

the sewage draining device is characterized in that a sewage draining outlet is formed in the inner bottom end of the sewage storing bin, a sewage draining pipe which is communicated with the sewage draining outlet is fixedly connected with the sewage draining outlet, a second switching valve is connected to the lower end of the sewage draining pipe, a vertical baffle is fixedly connected to the inside of the sewage storing bin and arranged on the right side of the sewage draining pipe, a filtering hole is formed in the upper portion of the vertical baffle, a water outlet is formed in the lower end of one side of the sewage storing bin, a filter screen is fixedly connected to the left side of the water outlet, a water pump is fixedly connected to one side of the sewage storing bin, a water inlet pipe is fixedly connected to the input end of the water pump, the other end of the water inlet pipe is communicated with the water outlet, and a water outlet pipe is fixedly connected to the output end of the water pump.

As preferable in the utility model, the tilting mechanism comprises a first triangular block, a second triangular block, a plurality of springs, a tilting plate and a vibration mechanism, wherein the first triangular block and the second triangular block are fixedly connected to the bottom end of the sewage storage bin, the springs are respectively fixedly connected to the inclined surfaces of the first triangular block and the second triangular block, the tilting plate is commonly connected with the other ends of the springs, and the vibration mechanism is used for vibrating the tilting plate, and the outer sides of the tilting plate are respectively connected with the inner wall of the sewage storage bin and one side of the vertical baffle in a sliding manner.

As the preferable stirring mechanism of the utility model, the stirring mechanism comprises a motor fixedly connected with the upper end of the sewage storage bin, a screw fixedly connected with the output end of the motor and a spiral tooth fixedly connected with the outer surface of the screw, and the screw and the spiral tooth are both positioned above the sewage draining outlet.

As the preferable mode of the utility model, the vibration mechanism comprises a vibrator fixedly connected to the lower end of the sewage storage bin and a short rod fixedly connected to the output end of the vibrator, the lower end of the inclined plate is provided with a groove, and the short rod is matched with the groove.

As the preferable mode of the utility model, the middle positions around the culture pond are provided with the sliding grooves, the four vertical plates are in sliding connection with the sliding grooves through the sliding blocks, one side of each vertical plate is fixedly connected with the side wall of the net cage, the upper ends of the four vertical plates are fixedly connected with hanging holes, the lower ends of the four vertical plates are commonly connected with the cross support, and the upper surface of the cross support is fixedly connected with the bottom end of the net cage.

As preferable in the utility model, the lower end of the dirt storage bin is fixedly connected with a sealing gasket, and the short rod penetrates through the sealing gasket and is in sliding connection with the sealing gasket.

Preferably, the cross section of the filtering hole on the vertical baffle plate is trapezoid, and the water inlet end diameter of the filtering hole is smaller than the water outlet end diameter of the filtering hole.

The utility model has at least the following beneficial effects:

1. according to the utility model, the cultivation pond, the net cage, the lower sewage bin, the lower sewage pipe, the first switch valve, the sewage storage bin, the sewage drain, the second switch valve, the vertical baffle, the filtering hole, the water outlet, the filter screen, the water pump, the water inlet pipe and the water outlet pipe are cooperatively used, the first switch valve is opened, sewage and sewage enter the sewage storage bin through the lower sewage pipe communicated with the lower sewage bin, sewage enters the right side of the sewage storage bin through the filtering hole on the vertical baffle, the water pump is started, the water pump extracts sewage on the right side of the sewage storage bin through the water inlet pipe, and the sewage is discharged through the water outlet pipe, so that the effects of quickly discharging the sewage and collecting the sewage through the vertical baffle arranged are achieved.

2. According to the utility model, through the matched use of the first triangular block, the second triangular block, the spring and the inclined plate, the dirt falling into the dirt storage bin can be quickly collected to the sewage outlet, so that the dirt can be conveniently discharged from the sewage pipe.

3. According to the utility model, the motor, the screw and the spiral teeth are matched for use, and the motor is started to drive the spiral teeth to rotate through the screw, so that large-scale dirt can be crushed, and the dirt can be conveniently discharged from the sewage discharge pipe.

4. According to the utility model, the vibrator, the short rod and the groove are matched for use, and the vibrator is started to drive the short rod to shake up and down, so that the short rod is matched with the groove, and the inclined plate can be jacked up back and forth.

5. According to the utility model, the sliding groove, the vertical plate, the sliding block, the hanging hole and the cross bracket are matched, the sliding block is matched with the sliding groove, the sliding block is fixedly connected with the vertical plate, the hanging hole is fixedly connected with the upper end of the vertical plate, and the net cage can be lifted from the culture pond through the hanging hole, so that the prawns in the net cage can be conveniently captured.

6. According to the utility model, the sealing gasket is arranged, so that sewage in the sewage storage bin can be prevented from flowing out through the gap between the short rod and the front part of the sewage storage bin.

7. According to the utility model, the cross section of the filtering hole is trapezoidal, the water inlet end diameter of the filtering hole is smaller than the water outlet end diameter of the filtering hole, dirt in the end diameter of the filtering hole can be discharged through the water outlet end diameter of the filtering hole through filtering Kong Jinshui, and the filtering hole can be prevented from being blocked by the dirt.

Drawings

FIG. 1 is a schematic diagram of a left and right isometric view provided by an embodiment of the present utility model;

FIG. 2 is a right side view provided by an embodiment of the present utility model;

FIG. 3 is a perspective cross-sectional view at B-B in FIG. 2 provided by an embodiment of the present utility model;

FIG. 4 is an enlarged view of FIG. 3A provided by an embodiment of the present utility model;

FIG. 5 is an enlarged view of FIG. 3B provided by an embodiment of the present utility model;

fig. 6 is an enlarged view of fig. 3 at C provided by an embodiment of the present utility model.

In the figure: 1. a culture pond; 11. a cage; 12. a sewage bin is arranged; 13. a sewage discharging pipe; 14. a first switching valve; 15. a dirt storage bin; 16. a sewage outlet; 17. a blow-down pipe; 18. a second switching valve; 19. a vertical baffle; 20. a filter hole; 21. a water outlet; 22. a filter screen; 23. a water pump; 24. a water inlet pipe; 25. a water outlet pipe; 2. a tilting mechanism; 201. a first triangular block; 202. a second triangular block; 203. a spring; 204. an inclined plate; 3. a stirring mechanism; 301. a motor; 302. a screw; 303. spiral teeth; 4. a vibration mechanism; 401. a vibrator; 402. a short bar; 403. a groove; 5. a sliding groove; 51. a riser; 52. a sliding block; 53. a hanging hole; 54. a cross bracket; 6. and a sealing gasket.

Detailed Description

For a further understanding of the utility model, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings.

The structure of the present utility model will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 6, the sewage filtering device for shrimp culture provided by the embodiment of the utility model comprises a culture pond 1 and a net cage 11, wherein the lower end of the culture pond is fixedly connected with a lower sewage bin 12, the lower end of the lower sewage bin 12 is vertically and fixedly connected with a lower sewage pipe 13 which is communicated with the lower sewage bin 12, a first switch valve 14 is arranged on the lower sewage pipe 13, the lower end of the lower sewage pipe 13 is fixedly connected with a sewage storage bin 15, and a stirring mechanism 3 for stirring crushed sewage and facilitating the discharge of the sewage and an inclined mechanism 2 for facilitating the falling of the sewage are arranged in the sewage storage bin 15;

the drain 16 has been seted up to the interior bottom of holding dirty storehouse 15, fixedly connected with drain 17 that is linked together on the drain 16, drain 17 lower extreme is connected with second ooff valve 18, hold dirty storehouse 15 inside fixedly connected with vertical baffle 19, vertical baffle 19 sets up on dirty pipe 13 right side down, filter hole 20 has been seted up to vertical baffle 19 upper portion, the delivery port 21 has been seted up to the lower extreme of holding dirty storehouse 15 one side, delivery port 21 left side fixedly connected with filter screen 22, the one side fixedly connected with water pump 23 of holding dirty storehouse 15, water pump 23 input fixedly connected with inlet tube 24, the inlet tube 24 other end is linked together with delivery port 21, water pump 23 output fixedly connected with outlet pipe 25.

Referring to fig. 6, the tilting mechanism 2 includes a first triangular block 201 and a second triangular block 202 fixedly connected to the bottom end of the dirt storage bin 15, a plurality of springs 203 fixedly connected to inclined surfaces of the first triangular block 201 and the second triangular block 202, a tilting plate 204 commonly connected to the other ends of the plurality of springs 203, and a vibrating mechanism 4 for vibrating the tilting plate 204, wherein the outer sides of the tilting plate 204 are slidably connected to the inner wall of the dirt storage bin 15 and one side of the vertical baffle 19, respectively.

The scheme is adopted: through setting up the cooperation of first triangular block 201, second triangular block 202, spring 203 and hang plate 204 and use, can make the filth that falls down in holding dirty storehouse 15 collect drain 16 fast, the filth of being convenient for is discharged from blow off pipe 17 in.

Referring to fig. 3, the stirring mechanism 3 includes a motor 301 fixedly connected to the upper end of the sewage storage bin 15, a screw 302 fixedly connected to the output end of the motor 301, and a screw tooth 303 fixedly connected to the outer surface of the screw 302, wherein one end of the screw 302, which is close to the motor 301, penetrates through the sewage storage bin 15 and is rotatably connected to the sewage storage bin 15, and both the screw 302 and the screw tooth 303 are located above the sewage drain 16.

The scheme is adopted: through setting up the cooperation of motor 301, screw rod 302 and helical tooth 303 and using, start motor 301 passes through screw rod 302 and drives helical tooth 303 rotation, can smash large-scale filth, makes things convenient for the filth to discharge from blow off pipe 17.

Referring to fig. 4, the vibration mechanism 4 includes a vibrator 401 fixedly connected to the lower end of the dirt storage bin 15, and a short rod 402 fixedly connected to the output end of the vibrator 401, and a groove 403 is formed in the lower end of the inclined plate 204, where the short rod 402 is engaged with the groove 403.

The scheme is adopted: through setting up the cooperation of electromagnetic shaker 401, quarter butt 402 and recess 403 and using, start electromagnetic shaker 401, drive quarter butt 402 and shake from top to bottom, quarter butt 402 and recess 403 looks adaptation can make inclined plate 204 by jack-up, inclined plate 204 reset under the effect of spring 203, can make the filth on the inclined plate 204 tremble off, falls drain 16 fast, inclined plate 204 inclination is 5 degrees to 30 degrees, the preferred angle is 25 degrees.

Referring to fig. 6, sliding grooves 5 are formed in the middle positions around the culture pond 1, four vertical plates 51 are in sliding connection with the sliding grooves 5 through sliding blocks 52, one sides of the four vertical plates 51 are fixedly connected with the side wall of the net cage 11, hanging holes 53 are fixedly connected to the upper ends of the four vertical plates 51, cross supports 54 are connected to the lower ends of the four vertical plates 51 together, and the upper surfaces of the cross supports 54 are fixedly connected with the bottom end of the net cage 11.

The scheme is adopted: through setting up the cooperation of sliding tray 5, riser 51, sliding block 52, hanging hole 53 and cross support 54 and using, the cooperation of sliding block 52 and sliding tray 5, sliding block 52 and riser 51 fixed connection, riser 51 upper end fixedly connected with hanging hole 53, through hanging hole 53, can make net cage 11 rise from in the breed pond 1, be convenient for observe and catch the shrimp in the net cage 11.

Referring to fig. 4, a sealing gasket 6 is fixedly connected to the lower end of the dirt storage bin 15, and a short rod 402 penetrates the sealing gasket 6 and is slidably connected with the sealing gasket 6.

The scheme is adopted: by providing the gasket 6, the sewage in the sewage storage chamber 15 can be prevented from flowing out through the gap between the short bar 402 and the sewage storage chamber 15.

Referring to fig. 4, the cross-sectional shape of the filter hole 20 on the vertical baffle 19 is trapezoidal, and the water inlet end diameter of the filter hole 20 is smaller than the water outlet end diameter of the filter hole 20.

The scheme is adopted: by setting the cross-sectional shape of the filter hole 20 to be trapezoid, the water inlet end diameter of the filter hole 20 is smaller than the water outlet end diameter of the filter hole 20, dirt in the water inlet end diameter of the filter hole 20 can be discharged through the water outlet end diameter of the filter hole 20, and the filter hole 20 can be prevented from being blocked by dirt.

The working principle of the utility model is as follows:

when in use, the first switch valve 14 is opened, the sewage doped with sewage collected in the lower sewage bin 12 falls into the sewage storage bin 15 through the lower sewage pipe 13, the vertical baffle 19 is fixedly connected in the sewage storage bin 15, the upper half part of the vertical baffle 19 is provided with the filter hole 20, when the sewage in the sewage storage bin 15 is higher than the filter hole 20 of the vertical baffle 19, the sewage flows into the right side of the sewage storage bin 15 through the filter hole 20, flows out through the water outlet on the right side of the sewage storage bin 15, the water outlet is communicated with the water inlet pipe 24, the water pump 23 is started to extract the sewage on the right side of the sewage storage bin 15 through the water inlet pipe 24, the sewage is discharged through the water outlet pipe 25, the first switch valve 14 is closed, the second switch valve 18 is opened, the motor 301 and the vibrator 401 are started simultaneously, the motor 301 rotates to drive the spiral teeth 303 to rotate through the screw 302, the large sewage in the sewage storage bin 15 is smashed, the vibrator 401 continuously pushes up the inclined plate 204 through the short rod 402, the inclined plate 204 is continuously reset under the action of the spring 203, the sewage on the inclined plate 204 falls into the sewage drain port 16, the sewage drain pipe 17 is used for collecting and the sewage through the soil for fertilization and the like,

to sum up: this shrimp is bred and uses blowdown filter equipment, through setting up breed pond 1, the box with a net 11, lower dirty storehouse 12, lower dirty pipe 13, first switch valve 14, hold dirty storehouse 15, drain 16, drain 17, second switch valve 18, vertical baffle 19, filtration pore 20, delivery port 21, filter screen 22, water pump 23, the cooperation of inlet tube 24 and outlet pipe 25 is used, open first switch valve 14, the dirt enters into in the dirty storehouse 15 through lower dirty pipe 13 that dirty storehouse 12 is linked together down, the sewage enters into the dirty storehouse 15 right side through filtration pore 20 on the vertical baffle 19, start water pump 23, water pump 23 draws the sewage on the dirty storehouse 15 right side through inlet tube 24, discharge through the drain pipe, the current equipment filter screen 22 level setting has been solved, the dirty accumulation that the sawtooth stirring leaf can not be smashed easily makes filter screen 22, the sawtooth stirring leaf smashes partial filth, make filth and rivers mix and form the sewage, the sewage can't in time discharge, the problem that easily cause the survival to shrimp in the pond 1.

Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, substantially achieving the technical effect.

It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude that an additional identical element is present in a commodity or system comprising the element.

While the foregoing description illustrates and describes the preferred embodiments of the present utility model, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims (7)

1. The utility model provides a shrimp is bred and uses blowdown filter equipment, includes breed pond (1) and box with a net (11), its characterized in that: the lower end of the cultivation is fixedly connected with a lower sewage bin (12), the lower end of the lower sewage bin (12) is vertically and fixedly connected with a lower sewage pipe (13) which is communicated with each other, a first switch valve (14) is arranged on the lower sewage pipe (13), the lower end of the lower sewage pipe (13) is fixedly connected with a sewage storage bin (15), and a stirring mechanism (3) for stirring crushed sewage and facilitating sewage discharge and an inclined mechanism (2) for facilitating sewage falling are arranged in the sewage storage bin (15);

the sewage draining device is characterized in that a sewage draining outlet (16) is formed in the inner bottom end of the sewage storing bin (15), a sewage draining pipe (17) which is communicated with the sewage draining outlet (16) is fixedly connected with the lower end of the sewage draining pipe (17), a second switching valve (18) is connected with the lower end of the sewage draining pipe (17), a vertical baffle (19) is fixedly connected to the inside of the sewage storing bin (15), the vertical baffle (19) is arranged on the right side of the lower sewage storing bin (13), a filtering hole (20) is formed in the upper portion of the vertical baffle (19), a water outlet (21) is formed in the lower end of one side of the sewage storing bin (15), a filter screen (22) is fixedly connected to the left side of the water outlet (21), a water pump (23) is fixedly connected to the input end of the water pump (23), the other end of the water inlet pipe (24) is communicated with the water outlet (21), and the output end of the water pump (23) is fixedly connected with a water outlet pipe (25).

2. A sewage filter device for prawn culture as claimed in claim 1, wherein: the tilting mechanism (2) comprises a first triangular block (201) fixedly connected to the bottom end of the sewage storage bin (15), a second triangular block (202), a plurality of springs (203) fixedly connected to the inclined surfaces of the first triangular block (201) and the second triangular block (202), a tilting plate (204) jointly connected with the other ends of the springs (203) and a vibrating mechanism (4) used for vibrating the tilting plate (204), wherein the outer sides of the tilting plate (204) are respectively connected with the inner wall of the sewage storage bin (15) and one side of the vertical baffle plate (19) in a sliding mode.

3. A sewage filter device for prawn culture as claimed in claim 1, wherein: the stirring mechanism (3) comprises a motor (301) fixedly connected with the upper end of the sewage storage bin (15), a screw rod (302) fixedly connected with the output end of the motor (301) and spiral teeth (303) fixedly connected with the outer surface of the screw rod (302), one end, close to the motor (301), of the screw rod (302) penetrates through the sewage storage bin (15) and is rotationally connected with the sewage storage bin (15), and the screw rod (302) and the spiral teeth (303) are located above the sewage drain (16).

4. A sewage filter device for prawn culture as claimed in claim 2, wherein: the vibrating mechanism (4) comprises a vibrator (401) fixedly connected to the lower end of the sewage storage bin (15) and a short rod (402) fixedly connected to the output end of the vibrator (401), a groove (403) is formed in the lower end of the inclined plate (204), and the short rod (402) is matched with the groove (403).

5. A sewage filter device for prawn culture as claimed in claim 1, wherein: the utility model discloses a cultivation pond, including cultivation pond (1), fixed connection, cross support (54) are connected with box with a net (11) bottom fixed connection, fixed connection is fixed on one side of riser (51) and box with a net (11) lateral wall, fixed connection is fixed on four riser (51) upper end all fixed connection hanging hole (53), four riser (51) lower extreme is connected with cross support (54) jointly, cross support (54) upper surface and box with a net (11) bottom fixed connection through sliding block (52) and sliding groove (5) all are offered to intermediate position all around.

6. A sewage filter device for prawn culture as claimed in claim 4, wherein: the lower end of the sewage storage bin (15) is fixedly connected with a sealing gasket (6), and the short rod (402) penetrates through the sealing gasket (6) and is in sliding connection with the sealing gasket (6).

7. A sewage filter device for prawn culture as claimed in claim 1, wherein: the cross section of the filtering hole (20) on the vertical baffle plate (19) is trapezoid, and the water inlet end diameter of the filtering hole (20) is smaller than the water outlet end diameter of the filtering hole (20).