CN212078196U

CN212078196U - Sewer well cover capable of automatically controlling opening and closing of water outlet

Info

Publication number: CN212078196U
Application number: CN202020652304.7U
Authority: CN
Inventors: 郑伟; 金晓雯
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2020-12-04
Anticipated expiration: 2030-04-26

Abstract

The utility model provides a sewer well lid capable of automatically controlling the opening and closing of a water outlet, which relates to the technical field of municipal drainage devices and aims to solve the problem that the water outlet on the sewer well lid is normally kept in an open state no matter in sunny days or rainy days, so that surrounding sundries easily block the water inlet, the sewer inlet is blocked, rainwater cannot be discharged in time in rainy days, the problem of road ponding is caused, and the municipal drainage paralysis is caused, and comprises a well lid main body; the middle part of the top plane of the well lid main body is vertically and fixedly provided with a rainfall induction mechanism downwards. The utility model discloses in because the position that the warning pipe is connected the department with a self-adaptation adjusting section of thick bamboo is but all in the below that keeps off the ring, remaining water will be through lower water hole B evacuation in the self-adaptation adjusting section of thick bamboo, and can open relative self-adaptation outlet in proper order according to the size of rainfall when raining, when the rain has stopped the back, but self-adaptation outlet self-closing.

Description

Sewer well cover capable of automatically controlling opening and closing of water outlet

Technical Field

The utility model relates to a municipal drainage technical field, more specifically say, in particular to automatic control outlet switch's sewer well lid.

Background

The well lid is used for covering a road or a deep well at home and preventing people or objects from falling. The material can be divided into a metal well cover, a high-strength fiber cement concrete well cover, a resin well cover and the like. A circular shape is generally used. Can be used for green belts, sidewalks, motor vehicle lanes, wharfs, alleys and the like.

A road sewer well lid as in patent application CN201822034795.4, including the lid, the lid includes vertical portion, first portion of bending and the second portion of bending, and the one end of first portion of bending and the second portion of bending sets up respectively on the top and the bottom of vertical portion, and the other end of first portion of bending and the second portion of bending extends to the different both sides level of vertical portion respectively, all is equipped with down the basin in vertical portion, first portion of bending and the second portion of bending. To sum up, such road sewer well lid, drainage space increases by a wide margin, and drainage efficiency can effectively promote, can effectively promote the drainage ability of road after using, alleviates road ponding problem.

Generally, a drainage port on a sewer well cover is normally kept in an open state in both sunny days and rainy days, so that surrounding impurities easily block a water inlet, a sewer port is blocked, rainwater cannot be discharged in time in the rainy days, and the problem of road ponding is caused, so that municipal drainage is paralyzed.

In view of the above, the present invention provides a manhole cover capable of automatically controlling the opening and closing of a drainage outlet, so as to achieve the purpose of higher practical value.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an automatic sewer well lid of control outlet switch to solve the outlet that sewer well lid was gone up, no matter be fine day or rainy day all normally keep the state of opening, cause debris on every side to easily plug up the water inlet, cause the sewer mouth to be blockked up, and the rainwater can not in time be arranged outward when rainy day, arouse the road ponding problem, cause the paralysed problem of municipal drainage.

The utility model discloses the purpose and the efficiency of the well lid of launching of automatic control outlet switch are reached by following specific technological means:

a sewer well cover capable of automatically controlling the opening and closing of a water outlet comprises a well cover main body; the middle part of the top plane of the well lid main body is vertically and downwards fixedly provided with a rainfall sensing mechanism; four self-adaptive adjusting cylinders with different lengths are annularly and fixedly installed on the bottom plane of the well lid main body by taking the rainfall sensing mechanism as a center;

the upper ends of the inner cavities of the self-adaptive adjusting cylinders are internally provided with communicating mechanisms in a sliding manner, and the upper ends of the communicating mechanisms penetrate through the well lid main body; the rainfall induction mechanism is fixedly communicated with the self-adaptive adjusting barrel through an overflow pipe.

Further, the well lid main part is including filtering the ring, normally opening outlet and self-adaptation outlet, be close to edge fixed mounting on the well lid main part top plane and filter the ring, the outlet has been opened normally to the middle part of well lid main part, and the self-adaptation outlet has been seted up again to the position department that the ring limit department of well lid main part corresponds the self-adaptation regulation section of thick bamboo of below.

Further, rainfall response mechanism includes down water hole A, the lower extreme of rainfall response mechanism sets up the lower water hole A who is linked together with the inner chamber, and its lower water hole A's diameter is half of the diameter of the normally open outlet in the well lid main part.

Furthermore, the self-adaptive adjusting cylinder comprises an anti-blocking support bottom, a lower water hole B, a water blocking body, fixing columns and a blocking ring, wherein the lower end of the self-adaptive adjusting cylinder is fixedly provided with the bowl-shaped anti-blocking support bottom, the inclined arc surface of the anti-blocking support bottom is provided with the lower water hole B with the diameter smaller than the diameter of the overflow pipe, the upper end of the self-adaptive adjusting cylinder is a tapered water blocking body, the communicating mechanism is vertically arranged in the water blocking body in a sliding manner, the wall of the self-adaptive adjusting cylinder ring is vertically welded with the four fixing columns fixedly connected with the well lid main body, and the blocking ring is fixedly arranged at the position, located at the lower end of the communicating mechanism, in the inner cavity.

Further, the communicating mechanism comprises a water drainage groove, a floating body and a bottom pad, the lower end of the communicating mechanism is fixedly bonded with the floating body, the lower end of the floating body is fixedly provided with the bottom pad corresponding to the baffle ring, when the bottom pad on the communicating mechanism is contacted with the baffle ring, the communicating mechanism is annularly provided with four vertical water drainage grooves in the part above the water baffle body, the upper end and the lower end of each water drainage groove are subjected to chamfering treatment, and the communicating mechanisms in four self-adaptive adjusting cylinders are consistent in structure, but the length of each communicating mechanism is changed along with the length of the corresponding self-adaptive adjusting cylinder.

Furthermore, the positions of the connecting parts of the overflow pipes and the self-adaptive adjusting cylinders are all located below the retaining rings, the length of the self-adaptive adjusting cylinder above the corresponding retaining ring changes along with the height change of the corresponding overflow pipe, the length of the self-adaptive adjusting cylinder connected with the lowest overflow pipe is longest and is changed in a step shape along with the length of the self-adaptive adjusting cylinder, the length of the self-adaptive adjusting cylinder is shorter upwards, and the self-adaptive adjusting cylinder corresponding to the length of the lower end of the communicating mechanism ensures that the lower end of a drainage groove in the communicating mechanism is always located above the water retaining body.

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

because the connecting positions of the overflow pipes and the self-adaptive adjusting cylinders are all positioned below the baffle rings, the length of the self-adaptive adjusting cylinder above the corresponding baffle ring also changes along with the height change of the corresponding overflow pipe, the length of the self-adaptive adjusting cylinder connected with the lowest overflow pipe is longest and is shorter upwards and is changed in a step shape, the self-adaptive adjusting cylinder with the length corresponding to the lower end of the communication mechanism ensures that the lower end of a drainage groove in the communication mechanism is always positioned above a water blocking body so as to be self-adaptively adjusted according to the magnitude of rainfall, the lower end of the rainfall sensing mechanism is provided with a lower water hole A communicated with an inner cavity, the diameter of the lower water hole A is half of that of a normally open drainage outlet on a well cover main body, when the normally open drainage outlet is filled when the rainfall is increased, the lower water hole A is difficult to drain in time, so that the rainfall sensing mechanism stores water, when the water storage height reaches the position of the overflow pipe at the lowest end, water enters the corresponding self-adaptive adjusting cylinder along the overflow pipe, the pipe diameter of the overflow pipe is larger than the pipe diameter of the lower water hole B, the self-adaptive adjusting cylinder is communicated, the maximum amount of passing rainwater is the sum of the passing amount of the lower water hole B and the passing amount of the lower water hole A, water is stored again after the value is broken through, the communication mechanism floats upwards through the floating body after the self-adaptive adjusting cylinder is filled with water until the bottom pad is clamped with the upper end of the inner cavity of the self-adaptive adjusting cylinder, the upper end of the drainage groove is simultaneously exposed above the well cover main body, the well cover main body is communicated up and down, drainage and drainage is directly carried out through the drainage groove, so that the drainage speed is increased, when the rainfall continues to rise the water level in the rainfall sensing mechanism, and reaches the second overflow pipe, the rainwater at the second stage, the second self-adaptive water outlet is developed, the analogy is carried out in sequence, a switch of the self-adaptive water outlet can be selected according to rainfall, a buffer space is reserved between intervals of the switch, so that the maximum water drainage can be kept, excessive water accumulation is avoided, meanwhile, after the rain stops, or no water needs to be discharged, the residual water in the self-adaptive adjusting barrel is emptied through the water drainage hole B, each structure is reset and returns to the normal state, the self-adaptive water outlet is used for waiting for the next time, the four self-adaptive water outlets are kept in a closed state in fine days, therefore, the water inlet can be prevented from being blocked by sundries, the situation that the rainwater cannot be discharged during the rain is avoided, the opposite self-adaptive water outlets can be opened in sequence according to the rainfall during the rain, and after the rain stops, the self-adaptive water outlets can be automatically closed.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic diagram of the right front upper axial view structure of the present invention.

Fig. 2 is a schematic diagram of the right front lower axial view structure of the present invention.

Fig. 3 is a schematic diagram of the right-side view structure of the present invention.

Fig. 4 is a schematic axial view of the communication mechanism of the present invention in the upward movement state.

Fig. 5 is a schematic view of the adaptive adjustment cylinder in a half-section state.

In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:

1. a well lid main body; 101. a filter ring; 102. a normally open water outlet; 103. a self-adaptive water outlet; 2. a rainfall sensing mechanism; 201. a drain hole A; 3. an overflow pipe; 4. a self-adaptive adjustment barrel; 401. anti-blocking bottom supporting; 402. a water drainage hole B; 403. a water retaining body; 404. fixing a column; 405. a baffle ring; 5. a communicating mechanism; 501. a water discharge tank; 502. a float; 503. a bottom cushion.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in figures 1 to 5:

the utility model provides a sewer manhole cover which can automatically control the opening and closing of a water outlet, comprising a manhole cover main body 1; the middle part of the top plane of the well lid main body 1 is vertically and downwards fixedly provided with a rainfall induction mechanism 2; four adaptive adjusting cylinders 4 with different lengths are annularly and fixedly arranged on the bottom plane of the well lid main body 1 by taking the rainfall sensing mechanism 2 as a center; the manhole cover main body 1 comprises a filter ring 101, a normally open water outlet 102 and a self-adaptive water outlet 103, the filter ring 101 is fixedly installed on the plane of the top of the manhole cover main body 1 close to the edge, the normally open water outlet 102 is formed in the middle of the manhole cover main body 1, the self-adaptive water outlet 103 is formed in the position, corresponding to the self-adaptive adjusting barrel 4 below the ring edge of the manhole cover main body 1, of the ring edge, drainage under the conditions of daily drainage and small rainfall can be met through the normally open water outlet 102, and the self-adaptive water outlet 103 needs to be opened according to the rainfall size of;

the upper ends of the inner cavities of the self-adaptive adjusting cylinders 4 are internally provided with communicating mechanisms 5 in a sliding manner, and the upper ends of the communicating mechanisms 5 penetrate through the well lid main body 1; the rainfall induction mechanism 2 is fixedly communicated with the self-adaptive adjusting barrel 4 through the overflow pipe 3.

Wherein, the rainfall sensing mechanism 2 includes the lower water hole A201, the lower end of the rainfall sensing mechanism 2 offers the lower water hole A201 communicated with cavity, the diameter of its lower water hole A201 is half of the diameter of the normal open outlet 102 on the well lid body 1, when the rainfall increases, fill the normal open outlet 102, the lower water hole A201 will be difficult to drain in time, cause to store water in the rainfall sensing mechanism 2, when the height of storing water reaches the position of the lowest overflow pipe 3, the water will enter the corresponding adaptive control cylinder 4 along the overflow pipe 3, because the pipe diameter of the overflow pipe 3 is greater than the pipe diameter of the lower water hole B402, communicate an adaptive control cylinder 4, the maximum accessible quantity of rainwater is the sum of the accessible quantity of a lower water hole B402 and lower water hole A201, store water again after breaking through this value, the adaptive control cylinder 4 stores water and will make the communicating mechanism 5 float through the floating body 502 after full, until the bottom pad 503 is clamped with the upper end of the inner cavity of the adaptive adjusting cylinder 4, the upper end of the drainage groove 501 is also exposed above the well cover main body 1, the well cover main body 1 is communicated up and down, drainage and drainage are directly carried out through the drainage groove 501, the drainage speed is accelerated, when the rainfall continues to increase, the water level in the rainfall sensing mechanism 2 continues to rise, when a second overflow pipe 3 is reached, rainwater in the second stage is discharged, the second adaptive drainage port 103 is developed, the analogy is repeated, the switch of the adaptive drainage port 103 can be selected according to the rainfall, and a buffering space is reserved between the intervals of the switch, so that the drainage at the maximum degree can be kept, excessive water accumulation is avoided, meanwhile, when the rainfall stops, or no water needs to be discharged, the residual water in the adaptive adjusting cylinder 4 is emptied through the lower drainage port B402, and each structure is reset, returning to normal state so as to wait for the next use.

Wherein, the adaptive adjusting cylinder 4 comprises an anti-blocking support bottom 401, a lower water hole B402, a water blocking body 403, a fixing column 404 and a baffle ring 405, the lower end of the adaptive adjusting cylinder 4 is fixedly provided with a bowl-shaped anti-blocking support bottom 401, the inclined arc surface of the anti-blocking support bottom 401 is provided with a lower water hole B402 with the diameter smaller than the pipe diameter of the overflow pipe 3, the upper end of the adaptive adjusting cylinder 4 is a tapered water blocking body 403, the communicating mechanism 5 is vertically and slidably arranged in the water blocking body 403, the annular wall of the adaptive adjusting cylinder 4 is vertically welded with four fixing columns 404 fixedly connected with the well lid main body 1, the baffle ring 405 is fixedly arranged at the lower end of the communicating mechanism 5 in the inner cavity of the adaptive adjusting cylinder 4, through the special structure of the water blocking body 403, the water discharged from the water discharge groove 501 can flow to the periphery along the water blocking body 403, the impact on the communicating mechanism 5 is reduced, and the chamfer structure, the impact on the communication mechanism 5 can be further reduced by the buoyancy of water.

The communicating mechanism 5 comprises a water drainage groove 501, a floating body 502 and a bottom pad 503, the floating body 502 is fixedly bonded at the lower end of the communicating mechanism 5, the bottom pad 503 corresponding to the baffle ring 405 is fixedly mounted at the lower end of the floating body 502, when the bottom pad 503 on the communicating mechanism 5 is contacted with the baffle ring 405, four vertical water drainage grooves 501 are annularly formed in the part, located above the baffle ring 403, of the communicating mechanism 5, chamfering processing is performed on the upper end and the lower end of each water drainage groove 501, and it is worth noting that the communicating mechanisms 5 in the four adaptive adjusting cylinders 4 are consistent in structure, but the length of each communicating mechanism is changed along with the length of the corresponding adaptive adjusting cylinder 4.

The positions of the connecting parts of the overflow pipes 3 and the adaptive adjusting cylinders 4 are all located below the baffle rings 405, the length of the adaptive adjusting cylinders 4 above the corresponding baffle rings 405 also changes along with the height change of the corresponding overflow pipes 3, the length of the adaptive adjusting cylinders 4 connected with the lowest overflow pipe 3 is longest and is changed in a step shape along with the length of the adaptive adjusting cylinders 4, the length of the adaptive adjusting cylinders 4 is shorter upwards, and the lower end of the communication mechanism 5 is ensured to be always located above the water blocking body 403 by the adaptive adjusting cylinders 4 corresponding to the length of the lower end of the communication mechanism 5, so that the adaptive adjusting can be conveniently carried out according to the rainfall.

The specific use mode and function of the embodiment are as follows:

when in use, firstly, a filtering ring 101 is fixedly installed on the top plane of the well lid main body 1 close to the edge, a normally open water outlet 102 is arranged in the middle of the well lid main body 1, a self-adaptive water outlet 103 is arranged at the position of the ring edge of the well lid main body 1 corresponding to the self-adaptive adjusting barrel 4 below, the normally open water outlet 102 can meet the drainage requirement under the condition of daily drainage and small rainfall, the self-adaptive water outlet 103 needs to be opened according to the rainfall amount of the army, because the positions of the connection parts of the overflow pipes 3 and the self-adaptive adjusting barrel 4 are both below the baffle ring 405, the length of the self-adaptive adjusting barrel 4 above the corresponding baffle ring 405 also changes along with the height change of the corresponding overflow pipe 3, the length of the self-adaptive adjusting barrel 4 connected with the overflow pipe 3 at the lowest part is longest and is changed in a ladder shape as the length of the self-adaptive adjusting barrel, the lower end position of a drainage channel 501 in a communication mechanism 5 is ensured to be always positioned above a water retaining body 403 so as to be self-adaptively adjusted according to the rainfall, the lower end of a rainfall sensing mechanism 2 is provided with a lower water hole A201 communicated with an inner cavity, the diameter of the lower water hole A201 is half of that of a normally open water outlet 102 on a well cover main body 1, when the normally open water outlet 102 is filled with the lower water hole A201 when the rainfall is increased, the lower water hole A201 is difficult to drain in time, so that water is stored in the rainfall sensing mechanism 2, when the water storage height reaches the position of an overflow pipe 3 at the lowest end, water enters a corresponding adaptive adjusting cylinder 4 along the overflow pipe 3, because the pipe diameter of the overflow pipe 3 is larger than that of the lower water hole B402, an adaptive adjusting cylinder 4 is communicated, the maximum amount of the passing of rainwater is the sum of the passing amount of the lower water hole B402 and the lower water hole A201, and the water is stored, after the adaptive adjusting cylinder 4 is filled with water, the communicating mechanism 5 floats upwards through the floating body 502 until the bottom pad 503 is clamped with the upper end of the inner cavity of the adaptive adjusting cylinder 4, the upper end of the drainage groove 501 is simultaneously exposed above the well cover main body 1, the well cover main body 1 is communicated up and down, drainage and drainage are directly carried out through the drainage groove 501, the drainage speed is accelerated, when the rainfall continues to increase, the water level in the rainfall sensing mechanism 2 continues to rise, when a second overflow pipe 3 is reached, the rainwater in the second stage is drained, the second adaptive drainage port 103 is developed, and the like, the switch of the adaptive drainage port 103 can be selected according to the rainfall, a buffer space is reserved between the intervals of the switch, so that the maximum drainage can be kept, excessive water accumulation is avoided, and meanwhile, after the rainfall stops, or when no water needs to be drained, the residual water in the adaptive adjusting cylinder 4 is drained through the drainage hole B402, each structure resets, returns the normality to in waiting for next use, keeps the closed state through four self-adaptation outlet 103 in sunny day, can prevent like this that to be plugged up the water inlet by debris, avoids blockking up, and the condition that the rainwater can not be arranged appears when causing raining, and can open relative self-adaptation outlet 103 according to the size of rainfall when raining in proper order, and when the rain has stopped the back, self-adaptation outlet 103 can self-closing.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. The utility model provides an automatic control outlet switch's sewer well lid which characterized in that: comprises a well cover main body (1); the middle part of the top plane of the well lid main body (1) is vertically and downwards fixedly provided with a rainfall sensing mechanism (2); four adaptive adjusting cylinders (4) with different lengths are annularly and fixedly installed on the bottom plane of the well lid main body (1) by taking the rainfall sensing mechanism (2) as a center;

the upper ends of the inner cavities of the self-adaptive adjusting cylinders (4) are respectively provided with a communication mechanism (5) in a sliding way, and the upper ends of the communication mechanisms (5) penetrate through the well lid main body (1); the rainfall induction mechanism (2) is fixedly communicated with the self-adaptive adjusting barrel (4) through the overflow pipe (3).

2. A manhole cover for automatically controlling opening and closing of a drain outlet according to claim 1, wherein: well lid main part (1) is including filtering ring (101), normally opening outlet (102) and self-adaptation outlet (103), be close to edge fixed mounting on well lid main part (1) top plane and have filtering ring (101), normally opening outlet (102) has been seted up at the middle part of well lid main part (1), and self-adaptation outlet (103) have been seted up again to the position department that the ring limit department of well lid main part (1) corresponds self-adaptation adjusting cylinder (4) of below.

3. A manhole cover for automatically controlling opening and closing of a drain outlet according to claim 1, wherein: rainfall induction mechanism (2) are including lower water hole A (201), lower water hole A (201) that are linked together with the inner chamber is seted up to the lower extreme of rainfall induction mechanism (2), and the diameter of its lower water hole A (201) is half of the diameter of normally opening outlet (102) on well lid main part (1).

4. A manhole cover for automatically controlling opening and closing of a drain outlet according to claim 1, wherein: the self-adaptive adjusting cylinder (4) comprises an anti-blocking support base (401), a lower water hole B (402), a water retaining body (403), a fixing column (404) and a retaining ring (405), wherein the anti-blocking support base (401) in a bowl shape is fixedly mounted at the lower end of the self-adaptive adjusting cylinder (4), the lower water hole B (402) with the diameter smaller than the pipe diameter of the overflow pipe (3) is formed in the inclined arc surface of the anti-blocking support base (401), the upper end of the self-adaptive adjusting cylinder (4) is the tapered water retaining body (403), the communicating mechanism (5) is vertically arranged in the water retaining body (403) in a sliding mode, four fixing columns (404) fixedly connected with the well lid main body (1) are vertically welded on the ring wall of the self-adaptive adjusting cylinder (4), and the retaining ring (405) is fixedly mounted at the position, located at the lower end of the communicating mechanism (5), in.

5. A manhole cover for automatically controlling opening and closing of a drain outlet according to claim 1, wherein: the connecting mechanism (5) comprises a water drainage groove (501), a floating body (502) and a bottom pad (503), the lower end of the connecting mechanism (5) is fixedly bonded with the floating body (502), the lower end of the floating body (502) is fixedly provided with the bottom pad (503) corresponding to the baffle ring (405), when the bottom pad (503) on the connecting mechanism (5) is in contact with the baffle ring (405), the part of the connecting mechanism (5) above the water baffle body (403) is annularly provided with four vertical water drainage grooves (501), the upper end and the lower end of each water drainage groove (501) are subjected to chamfering treatment, and the connecting mechanism (5) in four adaptive adjusting cylinders (4) is consistent in structure, but the length is changed along with the length of the corresponding adaptive adjusting cylinder (4).

6. A manhole cover for automatically controlling opening and closing of a drain outlet according to claim 1, wherein: the positions of the connecting parts of the overflow pipes (3) and the adaptive adjusting barrels (4) are all located below the baffle rings (405), the length of the adaptive adjusting barrel (4) above the corresponding baffle ring (405) also changes along with the height change of the corresponding overflow pipe (3), the length of the adaptive adjusting barrel (4) connected with the lowest overflow pipe (3) is longest, the length of the adaptive adjusting barrel is shorter upwards and changes in a step shape, and the adaptive adjusting barrel (4) corresponding to the length of the lower end of the communication mechanism (5) ensures that the lower end position of a drainage groove (501) in the communication mechanism (5) is always located above the water retaining body (403).