A sewerage device

Abstract

The utility model discloses a kind of sewerage devices, set between sink and sewerage main body, comprising: integrally-formed sewer and sewer pipe, the axis direction of sewer pipe and the axis direction of sewer are crossed arrangement;Sewer is equipped with mounting portion and for hanging in the annular support portion of the bottom of the washing sink, mounting portion is worn in washing sink mounting hole and with mounting hole detachably connected;Sewer drum, its top opening forms with for accommodating slag collection filter basket's slag collection groove, and the drain through-hole of several communication sewer pipe is equipped in slag collection groove tank bottom;Sewer drum includes the annular support portion on the upside of annular support portion, annular support portion is folded down and tightly annular support portion outer circumferential surface and / or underside surface folding portion to make sewer drum fixed on sewer.The utility model provides a kind of sewerage device, by integrated design, solve traditional structure leakage, blockage and installation complex and the like problems.

Description

Technical Field

[0001] This utility model relates to the field of drainage system technology, specifically to a drainage device. Background Technology

[0002] Traditional drainage systems in existing sink drainage systems present numerous problems. Firstly, most systems employ a separate design for the drain assembly and drain pipe, requiring assembly using multiple components such as threads, clips, or rubber rings. Over long-term use, this structure is prone to loosening at connections and seal failure due to vibration, thermal expansion and contraction, or aging. Furthermore, the need for assembly of multiple components during installation is not only cumbersome and time-consuming, but also prone to loosening and leaks at connections, affecting drainage reliability. Additionally, while some systems include a sludge collection basket, the lack of effective protection and positioning means that large particles of debris can still be flushed directly into the drain assembly when the basket is removed, posing a risk of pipe blockage. Regarding the fixing structure, existing drain pipes and drain assemblies often use locking mechanisms, such as threaded connections or intermediate screws, increasing manufacturing difficulty and cost. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background technology and provide a drainage device that solves the problems of leakage, blockage and complicated installation of traditional structures through integrated design.

[0004] To achieve the above objectives, the various embodiments of this utility model adopt the following technical solutions, but are not limited to the following solutions:

[0005] The first technical solution relates to a drainage device, disposed between a water tank and a drainage body, comprising: an integrally formed drain assembly and a drain pipe, wherein the axial direction of the drain pipe intersects the axial direction of the drain assembly; the drain assembly has a mounting part and an annular support part for hanging on the bottom of the washing water tank, the mounting part passing through a mounting hole in the washing water tank and detachably connected to the mounting hole; a drain cylinder, the top opening of which forms a sludge collection trough for accommodating a sludge collection filter basket, the bottom of the sludge collection trough having a plurality of drainage holes communicating with the drain pipe; the drain cylinder includes an annular support part hanging on the upper side of the annular support part, the annular support part being folded downward and pressed against the folded part on the outer peripheral surface and / or lower side of the annular support part to fix the drain cylinder on the drain assembly.

[0006] The second technical solution is based on the first technical solution, wherein the cylinder body and the annular support part of the drain tube are embedded on the drain device through a molding process, and the outer wall of the drain tube and the inner wall of the cavity are formed into an integrated covering structure through molding.

[0007] The third technical solution is based on the first technical solution, wherein the bottom of the washing sink is provided with a sunken drainage trough, and the washing sink mounting hole is located at the bottom of the drainage trough; the outer wall of the drainer is provided with a radially extending annular support, and the support abuts against the bottom of the drainage trough to form an axial limit.

[0008] The fourth technical solution is based on the second technical solution, wherein the drain cylinder is a stainless steel cylinder, and its top edge extends to form an annular support part, which covers and is embedded in the support part.

[0009] The fifth technical solution is based on the first technical solution, wherein the mounting part is provided with a first external thread, and the drainer is axially locked to the washing tank mounting hole by the first locking nut engaging with the first external thread.

[0010] The sixth technical solution is based on the first technical solution, wherein the end of the drain pipe is provided with an axially adjustable sealing structure, which is detachably connected to the drain body, including: at least two annular sealing grooves are arranged axially at intervals on the outer wall of the end of the drain pipe, and one of the sealing grooves is suitable for embedding a sealing ring; the inner wall of the drain body interface is formed with a sealing mating surface that is interference fit with the sealing ring.

[0011] The seventh technical solution is based on the sixth technical solution. In this solution, the outer wall of the main drainage interface is provided with a second external thread, and the axially adjustable sealing structure is engaged with the second external thread through the second locking nut, so that the sealing mating surface compresses the sealing ring and locks the seal.

[0012] The eighth technical solution is based on the first technical solution, and further includes a slag collection and filter basket. The slag collection and filter basket is suitable for being detachably installed in the slag collection tank by pulling a handle. The slag collection and filter basket has a number of filter holes to filter slag.

[0013] The ninth technical solution is based on the eighth technical solution, wherein the inner wall of the slag collection tank is provided with an inwardly protruding first step surface, and the slag collection filter basket is axially positioned by overlapping the edge with the first step surface.

[0014] The tenth technical solution is based on the first technical solution, and further includes a sealing cover plate. The sealing cover plate covers the top opening of the slag collection tank, and its edge is provided with a downwardly extending annular sealing skirt. A sealing strip is embedded on the inner side of the sealing skirt.

[0015] The eleventh technical solution is based on the tenth technical solution, wherein the top opening of the drain cylinder is provided with an inwardly protruding second step surface, and the sealing cover plate achieves a tight seal by cooperating with the second step surface through the sealing skirt.

[0016] As can be seen from the above description of the various embodiments of the present utility model, compared with the prior art, the various embodiments of the present utility model have the following beneficial effects:

[0017] In the first technical solution and related embodiments, the drain assembly and drain pipe adopt an integrated molding design. This structure effectively avoids potential problems such as leakage and loosening that are prone to occur at the connection points in a split structure, enhancing the integrity and sealing of the entire drain device and improving drainage reliability. The slag collection trough design of the drain cylinder provides convenient installation space for the slag collection and filter basket, effectively preventing large particles of garbage from being directly flushed into the drain assembly when the slag collection and filter basket is removed, while ensuring that the normal drainage function of the drain hole is not affected. The drain cylinder is firmly fixed to the drain assembly through a ring support and folding structure. Compared with the existing locking structure, this not only reduces the use of threaded structures and lowers the difficulty of manufacturing, but also reduces the number of accessories and lowers costs compared to the central screw locking method. In addition, the axial direction of the drain pipe intersects with the axial direction of the drain assembly, which can accommodate various pipe routes such as right angles or oblique angles, and adapt to unconventional under-sink spaces such as U-shaped and L-shaped ones. This allows the drain device to better adapt to the layout of sinks and drain bodies of different shapes and structures, effectively improving space utilization and installation flexibility. The drain assembly is designed to fit into the bottom hole of the sink, and uses a detachable connection method, which greatly facilitates users to install and remove the drain device themselves, making daily maintenance and cleaning easier and bringing great convenience to users.

[0018] In the second technical solution and related embodiments, the molding process makes the connection between the drain cylinder and the drain assembly tighter and more stable, structurally preventing the drain cylinder and the drain assembly from separating, thus enhancing the stability and reliability of the entire drainage device.

[0019] In the third technical solution and related embodiments, a sunken drainage trough is provided at the bottom of the water tank, and the radially extended support part around the installation part abuts against the bottom of the drainage trough to form an axial limit, so that the drainage device can be more stably fixed on the water tank after installation.

[0020] In the fourth technical solution and related embodiments, the stainless steel cylinder not only protects the engineering plastic drainer, but also the annular support formed at the top edge enhances the wear resistance and compressive strength of the annular support, providing additional protection and support for the support.

[0021] In the fifth technical solution and related embodiments, the threaded connection method is simple to operate and has a firm connection. Users can easily install and disassemble the drain device by rotating the first locking nut without special tools or complicated technical requirements, thus improving the convenience of installation and maintenance.

[0022] In the sixth technical solution and related embodiments, by arranging at least two sealing grooves along the axial direction on the outer circumference of the drain pipe end, the sealing ring can be embedded in different sealing grooves according to actual needs. If a shorter drain pipe is required, the sealing ring can be embedded in a sealing groove further away from the drain pipe end, and then the drain pipe can be inserted deeper into the drain body to mate with the sealing mating surface of the drain body interface inner wall, achieving flexible adjustment of the drain pipe length to meet the requirements of different drainage environments. The drain pipe is equipped with an adjustable sealing structure, which can flexibly adapt to the interface position of the drain body, enhancing the versatility and adaptability of the drainage device, enabling it to be installed quickly and accurately in a variety of different drainage environments without the need for additional adapter parts, thus reducing usage costs.

[0023] In the seventh technical solution and related embodiments, the threaded connection method is simple to operate and has a firm connection, ensuring the connection stability between the drainage device and the drainage body and preventing the connection from loosening due to water flow impact or external force.

[0024] In the eighth technical solution and related embodiments, the slag collection filter basket can be lifted and installed in the slag collection tank. Its distributed filter holes can effectively filter debris in the water, such as food scraps and hair, preventing these impurities from entering the drainage pipe and causing blockage. At the same time, the integrated design of the drain pipe and the drain device ensures the normal drainage function of the drain device when the slag collection filter basket is removed.

[0025] In the ninth technical solution and related embodiments, the inner wall of the slag collection tank is provided with an inwardly protruding first step surface. The slag collection filter basket is axially positioned by overlapping the edge with the first step surface. This positioning method is simple and reliable, and can ensure that the slag collection filter basket maintains a stable position in the accommodating cavity and will not be displaced due to water flow impact or shaking, thus ensuring the effectiveness of the filtration effect.

[0026] In the tenth technical solution and related embodiments, the edge of the sealing cover is provided with a sealing skirt that matches the shape of the slag collection tank opening. When the sealing cover is tightened, the sealing skirt can fit tightly with the slag collection tank opening to form a good sealing effect.

[0027] In the eleventh technical solution and related embodiments, the second step surface provides stable support for the sealing cover plate. The sealing cover plate achieves axial compression sealing by pressing against the second step surface. Compared with simple cover sealing, this compression sealing method can provide a more reliable sealing effect and ensure that the sealing cover plate and the support part fit tightly together. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is an exploded view of the drainage device in an embodiment;

[0030] Figure 2 This is an overall assembly drawing of the drainage device in the embodiment;

[0031] Figure 3 This is a schematic diagram of the drainage device structure in an embodiment;

[0032] Figure 4 for Figure 3 Enlarged view of point A;

[0033] Figure 5 for Figure 4 Enlarged view of point B;

[0034] Figure 6 for Figure 5 Enlarged view of point C.

[0035] Explanation of key figure labels:

[0036] Drainage device 1; washing tank 2; drainage body 3; drainage cylinder 10; drainer 11; drainage pipe 12; slag collection and filter basket 13; sealing cover 14; sealing ring 15; first sealing gasket 16; first locking nut 17; second locking nut 18; second sealing gasket 19; drainage groove 21; second external thread 31; sealing mating surface 32; slag collection groove 101; support part 102; first stepped surface 103; second stepped surface 104; folding part 105; support part 115; first external thread 116; sealing groove 121; sealing skirt 141; handle 142. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0038] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0039] Unless otherwise expressly defined, in the claims, description and accompanying drawings of this utility model, the use of directional terms such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise" to indicate orientation or positional relationship is based on the orientation and positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0040] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0041] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0042] See Figures 1 to 6 ,like Figure 1 As shown, a drainage device 1 is disposed between a water tank 2 and a drainage body 3, including an integrally formed drainage device 11, a drainage pipe 12 and a drainage cylinder 10, as well as a slag collection and filter basket 13 and a sealing cover plate 14.

[0043] Drain 11, such as Figures 1 to 3 As shown, it is integrally molded with the drain pipe 12, eliminating the risk of leakage at the separate connection. One end of the drain 11 is detachably connected to the washing sink 2, and the top opening of the drain 11 is connected to the mounting hole of the washing sink 2 to collect the water discharged from the washing sink 2 and guide the water into the drain pipe 12. One end of the drain pipe 12 is detachably connected to the drain body 3, and the water flows into the sewage pipe through the drain body 3.

[0044] The axial direction of the drain assembly 11 intersects with the axial direction of the drain pipe 12, which is compatible with right-angle or oblique pipe routing and adapts to unconventional under-sink spaces such as U-shaped and L-shaped designs. This allows the drain assembly 1 to better adapt to the layout of sinks 2 and drain bodies 3 with different shapes and structures, improving space utilization and installation flexibility. In this embodiment, the drain assembly 11 and drain pipe 12 adopt a right-angle pipe routing.

[0045] like Figure 1 and Figure 4As shown, the drain assembly 11 has a mounting part that passes through and is detachably connected to the mounting hole of the washing tank 2. Specifically, the mounting part has a first external thread 116, and the drain assembly 11 is axially locked to the mounting hole of the washing tank 2 by engaging with the first external thread 116 through a first locking nut 17. In this embodiment, the first locking nut 17 is watertightly screwed to the first external thread 116 of the mounting part through a first sealing gasket 16. This connection method is simple to operate and firmly connected. Users can easily install and remove the drain assembly 1 by rotating the nut without special tools or complex technical requirements, thus improving the convenience of installation and maintenance.

[0046] The bottom of the washing sink 2 is provided with a sunken drainage trough 21, and the mounting hole of the washing sink 2 is located at the bottom of the drainage trough 21; the outer periphery of the drain device 11 is provided with a radially extending annular support part 115, which abuts against the bottom of the drainage trough 21 to form an axial limit, so that the drain device 1 can be more stably fixed on the sink 2 after installation.

[0047] like Figures 1 to 3 As shown, the drain device 11 and the drain pipe 12 are integrally injection molded from engineering plastics. Engineering plastics have the advantages of being lightweight, corrosion-resistant, high-strength, and having a long service life, which improves the overall performance of the drain device 1 and enables it to adapt to different water quality and environmental conditions.

[0048] Drain 10, such as Figure 3 As shown, the slag collection tank 101 has a slag collection basket 13 for accommodating the slag collection and filter basket 13. The bottom of the slag collection tank 101 has several drainage holes (not shown in the figure) connected to the drain pipe 12. Figure 4 As shown, the drain cylinder 10 includes an annular support portion 102 hanging on the upper side of the annular support portion 115. The annular support portion 102 is folded downward and pressed against the folded portion 105 on the outer peripheral surface and / or lower side of the annular support portion 115 to fix the drain cylinder 10 to the drain assembly 11. Specifically, the cylinder body of the drain cylinder 10 and the annular support portion 102 are embedded into the drain assembly 11 by a molding process, and the outer wall of the drain cylinder 10 and the inner wall of the cavity are formed into an integral covering structure by molding. The integral molding method makes the connection between the drain cylinder and the drain assembly tighter and more stable, and structurally prevents the drain cylinder from detaching from the drain assembly, thereby enhancing the stability and reliability of the entire drain device.

[0049] In this embodiment, the drain cylinder 10 is a stainless steel cylinder with its top edge extending horizontally to form an annular support portion 102. The annular support portion 102 completely covers and is embedded in the annular support portion 115, and is bent and embedded in the lower side of the annular support portion 115 to form a folded portion 105. The stainless steel drain cylinder 10 not only protects the engineering plastic drainer 11, but the annular support portion 102 formed at the top edge also enhances the wear resistance and compressive strength of the annular support portion 115, providing additional protection and support for the support portion 115.

[0050] like Figure 1 and Figure 5 As shown, the end of the drain pipe 12 is provided with an axially adjustable sealing structure, which is detachably connected to the drain body 3. This adjustable sealing structure can adjust the length of the drain pipe 12 passing through the drain body 3 to adapt to the interface position of the drain body 3. Specifically, the outer wall of the end of the drain pipe 12 is provided with at least two annular sealing grooves 121 spaced axially, and one of the sealing grooves 121 is suitable for embedding a sealing ring 15. Figure 6 As shown, the inner wall of the drain body 3 interface has a sealing mating surface 32 that is interference-fitted with the sealing ring 15.

[0051] By providing at least two sealing grooves 121 along the axial direction on the outer circumference of the end of the drain pipe 12, the sealing ring 15 can be embedded in different positions of the sealing grooves 121 as needed. If a shorter drain pipe 12 is required, the sealing ring 15 can be embedded in the sealing groove 121 further away from the end of the drain pipe 12, and then the drain pipe 12 can be inserted deeper into the drain body 3 to mate with the sealing mating surface 32 on the inner wall of the interface of the drain body 3, thereby achieving flexible adjustment of the length of the drain pipe 12 to meet the requirements of different drainage environments. The drain pipe 12 is equipped with an adjustable sealing structure, which can flexibly adapt to the interface position of the drain body 3, enhancing the versatility and adaptability of the drainage device 1, enabling it to be installed quickly and accurately in a variety of different drainage environments without the need for additional adapter parts, thus reducing operating costs.

[0052] like Figure 1 , Figure 3 and Figure 6 As shown, the outer wall of the drain body 3 interface is provided with a second external thread 31. The axially adjustable sealing structure engages with the second external thread 31 through a second locking nut 18, causing the sealing mating surface 32 to compress the sealing ring 15 and lock it in place. Specifically, the second locking nut 18 is watertightly screwed to the second external thread 31 of the drain body 3 through a second sealing gasket 19. This threaded connection method is simple to operate and provides a firm connection, ensuring the stability of the connection between the drain device 1 and the drain body 3 and preventing loosening of the connection due to water flow impact or external force.

[0053] Sludge collection filter basket 13, such as Figures 1 to 3As shown, it is suitable for detachable installation in the slag collection tank 101 via a lifting handle. The slag collection filter basket 13 has several filter holes to filter slag, such as food scraps and hair, to prevent these impurities from entering the drainage pipe and causing blockage. Figure 4 As shown, the inner wall of the slag collection tank 101 is provided with an inwardly protruding first step surface 103. The slag collection filter basket 13 is axially positioned by overlapping the edge with the first step surface 103. This positioning method is simple and reliable, and can ensure that the slag collection filter basket 13 maintains a stable position in the accommodating cavity and will not be displaced due to water flow impact or shaking, thus ensuring the effectiveness of the filtration effect.

[0054] Sealing cover 14, such as Figures 1 to 3 As shown, the top opening of the slag collection trough 101 is covered, and its edge is provided with a downwardly extending annular sealing skirt 141. A sealing strip is embedded on the inner side of the sealing skirt 141. The edge of the sealing cover 14 has a sealing skirt 141 that matches the shape of the opening of the slag collection trough 101. When the sealing cover 14 is tightened, the sealing skirt 141 can fit tightly with the opening of the slag collection trough 101, forming a good sealing effect. A handle 142 is provided in the center of the sealing cover 14 for easy lifting and operation by the user.

[0055] like Figure 4 As shown, the top opening of the drain cylinder 10 has an inwardly protruding second stepped surface 104, and the sealing cover 14 achieves a tight seal by cooperating with the second stepped surface 104 through the sealing skirt 141. Compared with a simple cover seal, this tight seal method can provide a more reliable sealing effect, ensuring that the sealing cover 14 and the support part 115 fit tightly together.

[0056] In this embodiment, the drain assembly 11 and the drain pipe 12 are integrally molded. This structure effectively avoids potential problems such as leakage and loosening that are prone to occur at the connection points in a split structure, enhancing the integrity and sealing of the entire drain device 1 and improving the reliability of drainage. The slag collection trough design of the drain cylinder 10 not only provides convenient installation space for the slag collection filter basket 13, but also effectively prevents large particles of garbage from being directly flushed into the drain assembly when the slag collection filter basket 13 is removed, while ensuring that the normal drainage function of the drainage hole is not affected. The drain cylinder 10 is firmly fixed to the drain assembly 11 through the annular support part 102 and the folding part 105 structure. Compared with the existing locking structure, this not only reduces the use of threaded structures and reduces the difficulty of manufacturing, but also reduces the number of accessories and lowers costs compared with the intermediate screw locking method. Furthermore, the axis of the drain pipe 12 intersects with the axis of the drain assembly 11, allowing for compatibility with various pipe layouts, including right-angle and oblique angles. This adapts to unconventional under-sink spaces such as U-shaped and L-shaped designs, enabling the drain assembly 1 to better accommodate different shapes and structures of sinks 2 and the layout of the main drain unit, effectively improving space utilization and installation flexibility. The mounting part of the drain assembly 11 engages with the bottom hole of the sink, employing a detachable connection method. This greatly facilitates user installation and removal of the drain assembly, simplifying daily maintenance and cleaning, and providing significant convenience to users.

[0057] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A drainage device, disposed between a washing tank (2) and a drainage body (3), characterized in that, include: The drain assembly (11) and drain pipe (12) are integrally formed, with the axial direction of the drain pipe (12) intersecting the axial direction of the drain assembly (11); the drain assembly (11) is provided with an installation part and an annular support part (115) for hanging on the bottom of the washing tank (2), the installation part is inserted through the installation hole of the washing tank (2) and is detachably connected to the installation hole; the drain cylinder (10) has a slag collection trough (101) for accommodating the slag collection filter basket (13), and the bottom of the slag collection trough (101) is provided with a plurality of drainage through holes communicating with the drain pipe (12); The drain tube (10) includes an annular support (102) hanging on the upper side of the annular support (115). The annular support (102) is folded down and pressed against the folded part (105) of the outer peripheral surface and / or lower side of the annular support (115) so that the drain tube (10) is fixed on the drain device.

2. The drainage device as described in claim 1, characterized in that, The body of the drain cylinder (10) and the annular support (102) are embedded on the drain device (11) by molding process, and the outer wall of the drain cylinder (10) and the inner wall of the cavity are molded to form an integral covering structure.

3. A drainage device as described in claim 1, characterized in that, The washing tank (2) has a sunken drainage trough (21) at the bottom, and the installation hole of the washing tank (2) is located at the bottom of the drainage trough (21); the outer wall of the drainer (11) has a radially extending annular support (115), and the support (115) abuts against the bottom of the drainage trough (21) to form an axial limit.

4. A drainage device as described in claim 2, characterized in that, The drain cylinder (10) is a stainless steel cylinder with its top edge extending horizontally to form the annular support part (102). The annular support part (102) covers the annular support part (115) and is bent and embedded into the lower side of the annular support part (115) to form the folded part (105).

5. A drainage device as described in claim 1, characterized in that, The mounting part is provided with a first external thread (116), and the drain (11) is axially locked to the mounting hole of the washing tank (2) by the first locking nut (17) cooperating with the first external thread (116).

6. A drainage device as described in claim 1, characterized in that, The end of the drain pipe (12) is provided with an axially adjustable sealing structure, which is detachably connected to the drain body (3), including: The outer wall of the end of the drain pipe (12) is provided with at least two annular sealing grooves (121) spaced apart along the axial direction, and one of the sealing grooves (121) is adapted to be fitted with a sealing ring (15); The inner wall of the interface of the drain body (3) has a sealing mating surface (32) that is interference fit with the sealing ring (15).

7. A drainage device as described in claim 6, characterized in that, The outer wall of the interface of the main drain body (3) is provided with a second external thread (31). The axially adjustable sealing structure cooperates with the second external thread (31) through the second locking nut (18), so that the sealing mating surface (32) compresses the sealing ring (15) to lock and seal.

8. A drainage device as described in claim 1, characterized in that, It also includes a slag collection and filter basket (13), which is adapted to be detachably installed in the slag collection trough (101) by pulling a handle. The slag collection and filter basket (13) has a number of filter holes to filter slag.

9. A drainage device as described in claim 8, characterized in that, The inner wall of the slag collection tank (101) is provided with an inwardly protruding first step surface (103), and the slag collection filter basket (13) is axially positioned by overlapping the edge with the first step surface (103).

10. A drainage device as described in claim 1, characterized in that, It also includes a sealing cover plate (14), which covers the top opening of the slag collection tank (101) and has a downwardly extending annular sealing skirt (141) on its edge. A sealing strip is embedded on the inner side of the sealing skirt (141).

11. A drainage device as described in claim 10, characterized in that, The top opening of the drain tube (10) is provided with an inwardly protruding second step surface (104), and the sealing cover plate (14) is pressed and sealed by the cooperation of the sealing skirt (141) with the second step surface (104).

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