Fermentation bin cover

Abstract

The utility model relates to the technical field of human excrement treatment equipment, in particular to a fermentation bin cover, which comprises a bin cover body arranged above a fermentation bin, the bin cover body comprises: an outer cover, the lower end of which is provided with a water collecting channel; the inner cover is arranged on the inner wall side of the outer cover, and the inner cover is obliquely arranged in the direction from the upper end to the lower end of the outer cover; wherein a drainage channel is formed between the inner cover and the outer cover, and the drainage channel is communicated with the water collecting channel, so that the technical effect of avoiding the defect that the fermentation speed is influenced due to the fact that condensed water drops into the fermentation bin is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of human excrement treatment equipment, in particular to a fermentation bin cover. BACKGROUND

[0002] As an environmentally friendly sanitary facility, the design and use of green toilets fully reflect the requirements of the green development concept. Green toilets have been widely promoted in more and more areas, especially in some scenic areas and rural areas. Green toilets usually use water-saving or water-free flushing methods and treat excreta through microbial fermentation degradation technology. The process of decomposing organic matter into stable substances such as humus by microorganisms not only reduces the volume and odor of excreta, but also converts them into valuable organic fertilizers. Excreta after microbial fermentation are rich in nutrients and organic matter needed by plants, and are high-quality organic fertilizers. Biogas produced by anaerobic fermentation is a clean energy source that can be used for power generation, lighting, and fuel. During the fermentation process, stirring is usually required to mix microorganisms and excreta uniformly and improve the efficiency of microbial degradation. Therefore, green treatment of excreta is considered from the aspects of environmental protection, resource recycling, public health, social and economic benefits, and sustainable development, aiming to contribute to the sustainable development of mankind.

[0003] Prior art (for example, the utility model name is a dry toilet with fermentation tank body protection structure, and the announcement number is CN221635631U) discloses a dry toilet, which comprises a squatting pit plate, a squatting pit platform is arranged outside the squatting pit plate, a base is arranged below the squatting pit plate, a fermentation tank body is arranged at the lower end of the base, a sliding seat is arranged on the upper surface of the base, the inside of the sliding seat is communicated with the fermentation tank body, and a sliding cover plate moves along the sliding seat.

[0004] When the sliding cover plate is opened, the high-temperature gas generated in the fermentation process in the fermentation tank body will sequentially contact with the low-temperature environment outside through the opening of the fermentation tank body, the squatting pit plate and the outside. When the high-temperature gas meets the low-temperature environment, it will condense into condensed water. The condensed water produced will flow to the inner side wall of the top cover of the fermentation tank body from the opening of the fermentation tank body. Since the inner side wall of the top cover is a plane, if the condensed water on the inner side wall of the fermentation tank body cannot be removed in time, it will enter the fermentation tank body under the action of gravity, which will affect the humidity of the materials in the fermentation tank body and cannot provide an ideal humidity environment for the bacterial strain, thereby affecting the fermentation speed. CONTENT OF THE UTILITY MODEL

[0005] Therefore, the purpose of the present application is to provide a fermentation bin cover to avoid the problem of condensed water dropping into the fermentation bin and affecting the fermentation speed.

[0006] The first aspect of the embodiment discloses a fermentation bin cover, which comprises a cover body arranged above a fermentation bin, wherein the cover body comprises:

[0007] an outer cover, a water collecting channel being arranged at a lower end of the outer cover;

[0008] an inner cover, the inner cover being arranged at an inner wall side of the outer cover and being arranged in a slanting manner along a direction from an upper end to a lower end of the outer cover;

[0009] wherein a drainage channel is formed between the inner cover and the outer cover, and the drainage channel is communicated with the water collecting channel.

[0010] Preferably, the cover body further comprises a water collecting tank, the water collecting tank being arranged outside the fermentation bin, and the water collecting tank being communicated with the water collecting channel through a water collecting pipe.

[0011] Preferably, the outer cover comprises a first outer cover, a second outer cover, a third outer cover and a fourth outer cover, wherein the first outer cover is arranged with a first water collecting channel at a lower end thereof, the second outer cover is arranged with a second water collecting channel at a lower end thereof, the third outer cover is arranged with a third water collecting channel at a lower end thereof, and the fourth outer cover is arranged with a fourth water collecting channel at a lower end thereof, and the first outer cover, the second outer cover, the third outer cover and the fourth outer cover are connected in sequence.

[0012] Preferably, one end of the first water collecting channel is arranged with a second water outlet a, the first water collecting channel is arranged in a slanting manner along an end portion of the first water collecting channel close to the second water outlet a to an end portion of the first water collecting channel away from the second water outlet a, one end of the second water collecting channel is arranged with a second water outlet b, the second water collecting channel is arranged in a slanting manner along an end portion of the second water collecting channel close to the second water outlet b to an end portion of the second water collecting channel away from the second water outlet b, one end of the third water collecting channel is arranged with a second water outlet c, the third water collecting channel is arranged in a slanting manner along an end portion of the third water collecting channel close to the second water outlet c to an end portion of the third water collecting channel away from the second water outlet c, one end of the fourth water collecting channel is arranged with a second water outlet d, the fourth water collecting channel is arranged in a slanting manner along an end portion of the fourth water collecting channel close to the second water outlet d to an end portion of the fourth water collecting channel away from the second water outlet d, and the water collecting tank is communicated with the second water outlet a, the second water outlet b, the second water outlet c and the second water outlet d through a water collecting pipe.

[0013] Preferably, the first outer cover, the second outer cover, the third outer cover and the fourth outer cover are connected in sequence by being integrally formed.

[0014] Preferably, the cover body further comprises: a receiving port, the receiving port is located at the upper end of the cover body, and the receiving port is connected with the first outer cover, the second outer cover, the third outer cover and the fourth outer cover respectively.

[0015] Preferably, one of the first outer cover, the second outer cover, the third outer cover and the fourth outer cover is movably connected with the fermentation tank through a hinge.

[0016] Preferably, one of the first outer cover, the second outer cover, the third outer cover and the fourth outer cover is provided with a handle.

[0017] Preferably, the inner cover comprises: a first inner cover, a first drainage channel is formed between the first inner cover and the first outer cover; a second inner cover, a second drainage channel is formed between the second inner cover and the second outer cover; a third inner cover, a third drainage channel is formed between the third inner cover and the third outer cover; and a fourth inner cover, a fourth drainage channel is formed between the fourth inner cover and the fourth outer cover; wherein the first inner cover, the second inner cover, the third inner cover and the fourth inner cover are sequentially connected.

[0018] Preferably, a lower end of the first drainage channel is provided with a first water outlet a, and a first water collecting channel is communicated with the first water outlet a through a connecting pipe; a lower end of the second drainage channel is provided with a first water outlet b, and a second water collecting channel is communicated with the first water outlet b through a connecting pipe; a lower end of the third drainage channel is provided with a first water outlet c, and a third water collecting channel is communicated with the first water outlet c through a connecting pipe; and a lower end of the fourth drainage channel is provided with a first water outlet d, and a fourth water collecting channel is communicated with the first water outlet d through a connecting pipe.

[0019] The present application can avoid the problem that the condensate water drops into the fermentation tank and affects the fermentation speed by the cooperation of the cover body composed of the inner cover and the outer cover, the drainage channel and the water collecting channel, and finally discharging the condensate water on the inner surface of the cover body through the water collecting channel. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0021] FIG. 1 is a structural schematic view of a fermentation tank cover from a first perspective according to a first embodiment of the present application;

[0022] Fig. 2 is a structural schematic view of a second perspective of a cover of a fermentation bin according to the first embodiment of the present application;

[0023] Fig. 3 is a sectional view of Fig. 1 along a first direction;

[0024] Reference signs:

[0025] 1 - fermentation bin;

[0026] 2 - cover body, 21 - outer cover, 211 - first outer cover, 212 - second outer cover, 213 - third outer cover, 214 - fourth outer cover, 22 - inner cover, 221 - first inner cover, 222 - second inner cover, 223 - third inner cover, 224 - fourth inner cover, 23 - drainage passage, 231 - first drainage passage, 232 - second drainage passage, 233 - third drainage passage, 234 - fourth drainage passage, 24 - first water outlet d, 25 - water collection passage, 251 - first water collection passage, 252 - second water collection passage, 253 - third water collection passage, 254 - fourth water collection passage, 26 - second water outlet d, 27 - water collection pipe, 28 - water collection tank, 29 - handle, 30 - receiving port, 31 - hinge. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0028] In the present application, the orientation or positional relationship indicated by "up", "down", "outer" and the like is based on the orientation or positional relationship shown in the drawings. These terms are mainly used for better describing the present application and its embodiments, and are not used for limiting the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0029] In addition, the above-mentioned terms can be used to represent other meanings in addition to the orientation or positional relationship, for example, the term "up" can also be used to represent an attachment relationship or a connection relationship in some cases. A person of ordinary skill in the art can understand the specific meaning of these terms in the present application according to the specific situation.

[0030] Furthermore, the terms "installation," "setup," "equipped with," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0031] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0032] Example 1

[0033] like Figures 1-4 The fermentation chamber cover shown includes a cover body 2 disposed above the fermentation chamber 1. Specifically, the upper end of the cover body 2 is the end connected to the squat toilet, and the lower end of the cover body 2 is the end connected to the fermentation chamber 1.

[0034] The cover body 2 includes: an outer cover 21, with a water collection channel 25 provided at the lower end of the outer cover 21; and an inner cover 22, which is disposed on the inner wall side of the outer cover 21 and is inclined along the direction from the upper end to the lower end of the outer cover 21; wherein, a drainage channel 23 is formed between the inner cover 22 and the outer cover 21 and the drainage channel 23 is connected to the water collection channel 25.

[0035] The fermentation bin cover provided in the present example first passes through the cover body 2 composed of the outer cover 21 and the inner cover 22, the inner cover 22 is arranged on the inner wall side of the outer cover 21 and a drainage channel 23 is formed between the inner cover 22 and the outer cover 21, and the inner cover 22 is arranged obliquely, so that the water receiving surface of the drainage channel 23 (i.e. the outer side wall surface of the inner cover 22) is also arranged obliquely along the direction from the upper end to the lower end of the outer cover 21, so that the condensed water flowing from the opening of the fermentation bin cover (i.e. the material receiving port 30) to the inner wall side of the outer cover 21 is more easily guided to the lower end of the drainage channel 23 under the action of gravity. Since the water collecting channel 25 is arranged at the lower end of the outer cover 21 and is in communication with the drainage channel 23, the condensed water guided to the lower end of the drainage channel 23 can flow into the water collecting channel 25 through the water collecting channel 25 and be discharged through the water collecting channel 25, so that the condensed water can be effectively prevented from dripping from the inner wall side of the outer cover 21 into the fermentation bin 1 to affect the fermentation speed.

[0036] In order to collect the condensed water discharged from the water collecting channel, the cover body 2 further comprises a water collecting tank 28, which is arranged outside the fermentation bin 1 and is in communication with the water collecting channel 25 through the water collecting pipe 27.

[0037] In the present embodiment, the water collecting tank 28 is arranged and is in communication with the water collecting channel 25 through the water collecting pipe 27, so that the condensed water in the water collecting channel 25 can be introduced into the water collecting tank 28 through the water collecting pipe 27, and the collection of the condensed water discharged from the water collecting channel 25 can be completed through the water collecting tank 28.

[0038] In order to discharge the condensed water from the inner wall surface of the cover body, the outer cover 21 preferably comprises a first outer cover 211, a second outer cover 212, a third outer cover 213 and a fourth outer cover 214, wherein the first outer cover 211 is arranged at the lower end of the second outer cover 212, the second outer cover 212 is arranged at the lower end of the third outer cover 213, and the third outer cover 213 is arranged at the lower end of the fourth outer cover 214.

[0039] In this embodiment, the outer cover 21 is first formed by sequentially connecting the first outer cover 211, the second outer cover 212, the third outer cover 213 and the fourth outer cover 214, and the first outer cover 211 is provided with a first water collecting channel 251 at the lower end, the second outer cover 212 is provided with a second water collecting channel 252 at the lower end, the third outer cover 213 is provided with a third water collecting channel 253 at the lower end, and the fourth outer cover 214 is provided with a fourth water collecting channel 254 at the lower end. The condensate on the inner wall surface of the outer cover 21 around the lid body can be discharged through the first water collecting channel 251, the second water collecting channel 252, the third water collecting channel 253 and the fourth water collecting channel 254.

[0040] In order to completely drain the condensate in the water collecting channel, in this embodiment, one end of the first water collecting channel 251 is provided with a second water outlet a, and the first water collecting channel 251 is inclined from the end of the first water collecting channel 251 close to the second water outlet a to the end of the first water collecting channel 251 away from the second water outlet a; one end of the second water collecting channel 252 is provided with a second water outlet b, and the second water collecting channel 252 is inclined from the end of the second water collecting channel 252 close to the second water outlet b to the end of the second water collecting channel 252 away from the second water outlet b; one end of the third water collecting channel 253 is provided with a second water outlet c, and the third water collecting channel 253 is inclined from the end of the third water collecting channel 253 close to the second water outlet c to the end of the third water collecting channel 253 away from the second water outlet c; one end of the fourth water collecting channel 254 is provided with a second water outlet d26, and the fourth water collecting channel 254 is inclined from the end of the fourth water collecting channel 254 close to the second water outlet d26 to the end of the fourth water collecting channel 254 away from the second water outlet d26; wherein the water collecting tank 28 is in communication with each second water outlet through the water collecting pipe 27. In this embodiment, the first water collecting channel 251, the second water collecting channel 252, the third water collecting channel 253 and the fourth water collecting channel 254 are all inclined from the end close to the respective second water outlet to the end away from the second water outlet, so that all the water collecting channels 25 are inclined towards the respective second water outlet, which can make the condensate flowing into the water collecting channel 25 flow towards the second water outlet. At the same time, the water collecting tank 28 is in communication with each second water outlet, so that the condensate flowing out of each second water outlet can be collected by the water collecting tank 28, thereby completely draining the condensate in the water collecting channel.

[0041] In order to further guide the condensate water to flow on the inner surface of the cover body, preferably, the first outer cover 211, the second outer cover 212, the third outer cover 213 and the fourth outer cover 214 are sequentially connected by one-piece forming.

[0042] In the embodiment, the first outer cover 211, the second outer cover 212, the third outer cover 213 and the fourth outer cover 214 are sequentially connected by one-piece forming, so that the inner surface of the cover body 2 formed is smoother (for example, the inner surface of the cover body 2 does not have a weld seam), and the smoother surface is more conducive to guiding the condensate water to flow on the inner surface of the cover body 2.

[0043] In order to realize the connection of the cover body and the squatting toilet, the cover body 2 further comprises a material receiving port 30 in the upper end of the cover body 2, and the material receiving port 30 is connected with the first outer cover 211, the second outer cover 212, the third outer cover 213 and the fourth outer cover 214 respectively.

[0044] In the embodiment, the material receiving port 30 connected with the first outer cover 211, the second outer cover 212, the third outer cover 213 and the fourth outer cover 214 respectively is arranged in the upper end of the cover body, and by arranging the material receiving port 26, the discharge port of the squatting toilet can be directly connected with the material receiving port 30 when the squatting toilet is installed, so that the connection of the cover body 2 and the squatting toilet can be realized.

[0045] In order to facilitate opening of the cover of the fermentation bin, preferably, one of the first outer cover 211, the second outer cover 212, the third outer cover 213 and the fourth outer cover 214 is movably connected with the fermentation bin 1 through a hinge.

[0046] In order to further facilitate opening of the cover of the fermentation bin, preferably, one of the first outer cover 211, the second outer cover 212, the third outer cover 213 and the fourth outer cover 214 is provided with a handle 29.

[0047] In order to guide the condensate on each inner wall surface around the outer cover body into the water collecting channel, the inner cover 22 comprises: a first inner cover 221, a first drainage channel 231 is formed between the first inner cover 221 and the first outer cover 211; a second inner cover 222, a second drainage channel 232 is formed between the second inner cover 222 and the second outer cover 212; a third inner cover 223, a third drainage channel 233 is formed between the third inner cover 223 and the third outer cover 213; a fourth inner cover 224, a fourth drainage channel 234 is formed between the fourth inner cover 224 and the fourth outer cover 214; wherein the first inner cover 221, the second inner cover 222, the third inner cover 223 and the fourth inner cover 224 are connected in sequence.

[0048] In the embodiment, the inner cover 22 is composed of the first inner cover 221, the second inner cover 222, the third inner cover 223 and the fourth inner cover 224 connected in sequence, and the first drainage channel 231 is formed between the first inner cover 221 and the first outer cover 211, the second drainage channel 232 is formed between the second inner cover 222 and the second outer cover 212, the third drainage channel 233 is formed between the third inner cover 223 and the third outer cover 213, and the fourth drainage channel 234 is formed between the fourth inner cover 224 and the fourth outer cover 214, so that the condensate on each inner wall surface around the outer cover body can be guided through the first drainage channel 231, the second drainage channel 232, the third drainage channel 233 and the fourth drainage channel 234 respectively.

[0049] Specifically, in order to facilitate the flow of condensate, the first inner cover 221, the second inner cover 222, the third inner cover 223 and the fourth inner cover 224 are respectively inclined at an angle of 30°-50°, and specifically, the inclination angle between the first inner cover 221 and the horizontal plane is 30°, the inclination angle between the second inner cover 222 and the horizontal plane is 30°, the inclination angle between the third inner cover 223 and the horizontal plane is 30°, and the inclination angle between the fourth inner cover 224 and the horizontal plane is 30°.

[0050] In order to further guide the condensate on the inner wall surface of the periphery of the bin cover body into the water collecting channel, the lower end of the first drainage channel 231 is provided with a first water outlet a, and the first water collecting channel 251 is communicated with the first water outlet a through a connecting pipe; the lower end of the second drainage channel 232 is provided with a first water outlet b, and the second water collecting channel 252 is communicated with the first water outlet b through a connecting pipe; the lower end of the third drainage channel 233 is provided with a first water outlet c, and the third water collecting channel 253 is communicated with the first water outlet c through a connecting pipe; and the lower end of the fourth drainage channel 234 is provided with a first water outlet d24, and the fourth water collecting channel 254 is communicated with the first water outlet d24 through a connecting pipe.

[0051] In the embodiment, the first water outlet arranged at the lower end of the drainage channel 23 is communicated with the corresponding water collecting channel through a connecting pipe, thereby forming four condensate flowing channels, which is more conducive to guiding the condensate on the inner wall surface of the periphery of the bin cover body into the water collecting channel.

[0052] Each of the embodiments in the specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other. Each embodiment mainly describes the difference from other embodiments. The above is only the embodiment of the application, and is not used to limit the application. The application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application should be included in the right of the application.

Claims

1. A silo cover comprising a cover body (2) arranged above a silo (1), characterized in that The cover body (2) comprises: an outer cover (21) provided with a water collecting channel (25) at a lower end thereof; an inner cover (22) provided on an inner wall side of the outer cover (21), the inner cover (22) being obliquely arranged along a direction from an upper end to a lower end of the outer cover (21); wherein the inner cover (22) and the outer cover (21) form a drainage channel (23) and the drainage channel (23) is in communication with the water collecting channel (25).

2. The fermenting bin lid of claim 1, wherein, The cover body (2) further comprises: a water collecting tank (28) provided outside the fermentation bin (1), the water collecting tank (28) being in communication with the water collecting channel (25) through a water collecting pipe (27).

3. The fermenting bin lid of claim 2, wherein: The outer cover (21) comprises: a first outer cover (211) provided with a first water collecting channel (251) at a lower end thereof; a second outer cover (212) provided with a second water collecting channel (252) at a lower end thereof; a third outer cover (213) provided with a third water collecting channel (253) at a lower end thereof; a fourth outer cover (214) provided with a fourth water collecting channel (254) at a lower end thereof; wherein the first outer cover (211), the second outer cover (212), the third outer cover (213) and the fourth outer cover (214) are sequentially connected.

4. The fermentation bin cover according to claim 3, wherein one end of the first water collecting channel (251) is provided with a second water outlet a, the first water collecting channel (251) is obliquely arranged along an end portion of the first water collecting channel (251) close to the second water outlet a to an end portion of the first water collecting channel (251) away from the second water outlet a; one end of the second water collecting channel (252) is provided with a second water outlet b, the second water collecting channel (252) is obliquely arranged along an end portion of the second water collecting channel (252) close to the second water outlet b to an end portion of the second water collecting channel (252) away from the second water outlet b; one end of the third water collecting channel (253) is provided with a second water outlet c, the third water collecting channel (253) is obliquely arranged along an end portion of the third water collecting channel (253) close to the second water outlet c to an end portion of the third water collecting channel (253) away from the second water outlet c; one end of the fourth water collecting channel (254) is provided with a second water outlet d (26), the fourth water collecting channel (254) is obliquely arranged along an end portion of the fourth water collecting channel (254) close to the second water outlet d (26) to an end portion of the fourth water collecting channel (254) away from the second water outlet d (26); wherein the water collecting tank (28) is in communication with the second water outlet a, the second water outlet b, the second water outlet c and the second water outlet d (26) through the water collecting pipe (27) respectively. ​ ​ ​ 5. A fermenting bin lid as claimed in claim 3 or 4, characterised in that, The first outer cover (211), the second outer cover (212), the third outer cover (213) and the fourth outer cover (214) are sequentially connected by one-piece forming.

6. A fermenting bin lid as claimed in claim 3 or 4, characterised in that, The bin cover body (2) further comprises: A material receiving port (30) is arranged at the upper end of the bin cover body (2), and the material receiving port (30) is connected with the first outer cover (211), the second outer cover (212), the third outer cover (213) and the fourth outer cover (214) respectively.

7. A fermenting bin lid as claimed in claim 3 or 4, characterised in that, One of the first outer cover (211), the second outer cover (212), the third outer cover (213) and the fourth outer cover (214) is movably connected with the fermentation bin (1) through a hinge.

8. A fermenting bin lid as claimed in claim 3 or 4, characterised in that, One of the first outer cover (211), the second outer cover (212), the third outer cover (213) and the fourth outer cover (214) is provided with a handle (29).

9. The fermenting bin lid of claim 3, wherein, The inner cover (22) comprises: A first inner cover (221) is arranged between the first outer cover (211) and the first inner cover (221) to form a first drainage channel (231); A second inner cover (222) is arranged between the second outer cover (212) and the second inner cover (222) to form a second drainage channel (232); A third inner cover (223) is arranged between the third outer cover (213) and the third inner cover (223) to form a third drainage channel (233); A fourth inner cover (224) is arranged between the fourth outer cover (214) and the fourth inner cover (224) to form a fourth drainage channel (234); The first inner cover (221), the second inner cover (222), the third inner cover (223) and the fourth inner cover (224) are sequentially connected.

10. The fermentation bin cover according to claim 9, wherein: The lower end of the first drainage channel (231) is provided with a first water outlet a, and the first water collecting channel (251) is communicated with the first water outlet a through a connecting pipe; The lower end of the second drainage channel (232) is provided with a first water outlet b, and the second water collecting channel (252) is communicated with the first water outlet b through a connecting pipe; The lower end of the third drainage channel (233) is provided with a first water outlet c, and the third water collecting channel (253) is communicated with the first water outlet c through a connecting pipe; The lower end of the fourth drainage channel (234) is provided with a first water outlet d, and the fourth water collecting channel (254) is communicated with the first water outlet d through a connecting pipe. ​ ​

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