Sewer line sealing joint

Abstract

The invention discloses a sewer pipe sealing joint, which belongs to the technical field of pipe fittings, and is characterized in that the sewer pipe sealing joint comprises a first interface, a second interface, a pre-tightening piece and a sealing piece, the first interface is provided with a sewer pipe connecting slot, the second interface is arranged outside the first interface in a sliding manner, and the second interface is used for connecting a drain pipe; a central pipe is arranged in the second connector, the lower end of the central pipe penetrates through the interior of the first connector and can stretch into the sewer pipe, the sealing piece is arranged outside the central pipe, and a limiting cap for limiting the sealing piece is further arranged at the lower end of the central pipe; the second connector and / or the central pipe are / is provided with a step face, the pre-tightening piece is arranged between the step face and the first connector, the pre-tightening piece applies upward acting force to the step face, the limiting cap moves upwards and is matched with the first connector to extrude the sealing piece, and the sealing piece deforms and seals the pipe opening of the sewer pipe. The connector serves as a connecting piece of a sewer pipe and a drain pipe of a water tank and is more convenient to assemble and disassemble.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline accessories, and in particular relates to a sealing joint for a sewer pipe. Background Art

[0002] Washbasins, bathtubs and other kitchen and bathroom sanitary ware as well as vegetable washing basins are all provided with drains, and drains are usually installed in the drains. The main function of the drain is to achieve drainage and water storage of sanitary ware. For example, a kind of anti-foam overflow sink drain pipe disclosed in the Chinese patent with publication number CN218374221U is connected to the drainage pipe at the bottom by setting a water seal body and a water seal cover, forming a water passage while achieving water sealing, and can prevent odor. The drainage pipe needs to be inserted into the sewer pipe to achieve drainage of the sink, but there is a gap between the drainage pipe and the sewer pipe, resulting in poor air tightness of the sewer pipe, and the gap is prone to odor overflow, foam overflow or hiding of insects and ants.

[0003] Therefore, an applicant has designed an odor-proof sealed connection joint for a sewer pipe (publication number CN109723109A), comprising an upper connecting pipe and a lower connecting pipe, the upper connecting pipe consisting of a main pipe body, a threaded pipe, a gasket, a rubber pad and a tightening cover, the main pipe body consisting of a thick pipe upper end connected to a thin pipe, the threaded pipe is connected to the upper part of the thick pipe part of the main pipe, the gasket is sleeved on the thin pipe part of the main pipe body, the tightening cover is connected to the threaded pipe by threads, the rubber pad is C-shaped, the rubber pad is sleeved on the thin pipe part of the main pipe body, and is located above the gasket, and the rubber pad is in contact with the tightening cover, the lower connecting pipe consists of a thick pipe upper end connected to a thin pipe, and the thin pipe part of the lower connecting pipe is inserted into the thick pipe of the main pipe of the upper connecting pipe. The thin tube part of the main pipe is inserted into the basin drain pipe, the thick tube part of the lower connecting pipe is sleeved on the downpipe, and is sealed with sealant. The rubber pad is squeezed by tightening the tightening cover. The extruded rubber pad tightly connects the end of the basin drain pipe to the upper connecting pipe, thereby realizing a sealed connection between the basin drain pipe and the downpipe.

[0004] The above-mentioned joint is connected to the sewer pipe through the lower connecting pipe, and the two need to be bonded together with sealant, which makes it inconvenient for users to disassemble, replace or repair them later. Moreover, the current sealant has a short service life and is prone to aging and falling off after one year, and the sealing effect is not stable. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a sewer pipe sealing joint. The technical problem to be solved by the present invention is: how to improve the convenience of disassembly and assembly of the joint.

[0006] The above technical objectives of the present invention can be achieved through the following technical solutions: A sewer pipe sealing joint comprises an interface 1, an interface 2, a preload and a sealing member, wherein the interface 1 is provided with a slot for connecting the sewer pipe, the interface 2 is slidably arranged outside the interface 1, and the interface 2 is used to connect the drainage pipe; a central tube is arranged inside the interface 2, and the lower end of the central tube passes through the interior of the interface 1 and can extend into the sewer pipe, the sealing member is arranged outside the central tube, and a limiting cap for limiting the seal is also arranged at the lower end of the central tube; a step surface is arranged on the interface 2 and / or the central tube, the preload is arranged between the step surface and the interface 1, and the preload applies an upward force to the step surface, so that the limiting cap moves upward and cooperates with the interface 1 to squeeze the sealing member, and the sealing member deforms and seals the pipe mouth of the sewer pipe.

[0007] Through the above technical scheme, interface two is connected to the drain pipe of the sink, and then the limiting cap is inserted into the port of the sewer pipe. After the slot is plugged into the port of the sewer pipe, interface one remains stationary, and the preloaded part will push interface two and the center pipe upward as a whole, and the limiting cap will also drive the seal to move upward at the same time. After the seal and interface one are abutted, the limiting cap and interface one can squeeze the seal, and the seal deforms and seals the gap between the center pipe and the sewer pipe. In other words, the pipe mouth of the sewer pipe is sealed; interface two is pressed down to make the center pipe and the limiting cap move downward, and the seal automatically rebounds after losing the limit of interface one, so interface one can be easily pulled out from the sewer pipe mouth. The disassembly and assembly of this joint is more convenient, and the sealing method of the seal is faster.

[0008] In the above-mentioned sewer pipe sealing joint, the sealing member includes at least one annular sealing ring, and the sealing ring is elastically deformable. By using the elastic sealing ring as the sealing member, the air tightness between the central pipe and the sewer pipe can be effectively improved.

[0009] In the above-mentioned sewer pipe sealing joint, at least two sealing rings are provided, and a separator ring is provided between adjacent sealing rings, and the separator ring is slidably provided on the outer wall of the central pipe. More than two sealing rings are separated by the separator ring to ensure that each sealing ring can be balanced in force when squeezed, so as to improve the sealing effect.

[0010] In the above-mentioned sewer pipe sealing joint, the limiting cap is provided with a floor drain core, which can connect the central pipe with the sewer pipe. The provision of the floor drain core can improve the deodorization performance of the central pipe and prevent the odor in the sewer pipe from overflowing upward from the central pipe.

[0011] In the above-mentioned sewer pipe sealing joint, the limit cap is detachably connected to the central pipe. Through this arrangement, the difficulty of assembling the limit cap and the sealing member can be reduced.

[0012] In the above-mentioned sewer pipe sealing joint, the limit cap is slidably matched with the inner wall of the sewer pipe. After the interface 1 is plugged into the sewer pipe, the limit cap can abut against the inner wall of the sewer pipe, thereby preventing the joint from shaking in the sewer pipe and further improving the sealing stability of the sewer pipe.

[0013] In the above-mentioned sewer pipe sealing joint, a positioning groove is provided on the outer wall of the interface one, and a locking mechanism is provided on the interface two. The locking mechanism includes a slide plate and a locking spring. The slide plate is slidably arranged in the guide groove at the lower end of the interface two. The slide plate has a clearance hole for the upper end of the interface one to pass through. A vertical plate is provided on the slide plate. The locking spring is arranged between the vertical plate and the interface two. The locking spring applies a pre-tightening force to the vertical plate so that the hole wall of the clearance hole is pressed against the outer wall of the interface one. As the interface two moves, the slide plate can be stuck in the positioning groove. The locking spring always applies a pre-tightening force to the vertical plate, so that the hole wall of the yield hole abuts against the outer wall of interface one. After interface two drives the slide plate to be pressed down, the slide plate can automatically slide into the positioning groove, and the positioning groove limits the slide plate. Interface one and interface two are locked, and the two cannot continue to slide, that is, the distance between the limit cap and interface one remains fixed, the seal will not be compressed, and the lower end of the center tube can be easily inserted into the sewer pipe; the user presses the vertical plate, the locking spring is compressed, and after the slide plate is separated from the positioning groove, interface one and interface two are unlocked, and the two can slide relative to each other.

[0014] In the above-mentioned sewer pipe sealing joint, the outer wall of the second interface is provided with an assembly groove and / or a positioning block, and the assembly groove and / or the positioning block limit one end of the locking spring, and the other end of the locking spring is pressed against the vertical plate; or, the assembly groove and / or the positioning block are provided on the vertical plate. The assembly groove and the positioning block can limit the end of the locking spring, and no matter the assembly groove and the positioning block are provided on the second interface or the vertical plate, as long as they can limit the end of the locking spring, it is sufficient to ensure that the locking spring exerts a stable force on the vertical plate.

[0015] In the above-mentioned sewer pipe sealing joint, the outer wall of the second interface is provided with an arc-shaped guard plate, and the vertical plate is located inside the arc-shaped guard plate. The arc-shaped guard plate provides protection for the vertical plate and the locking spring to prevent the vertical plate from interfering with external debris.

[0016] In the above-mentioned sewer pipe sealing joint, the slide plate is provided with a connected pin hole 1 and a pin hole 2, the pin hole 1 and the vertical plate are symmetrically distributed on both sides of the slide plate, and the pin hole 1 is connected to the give way hole, and the pin hole 2 is close to the outer end of the slide plate; the interface 2 is provided with a mounting groove connected to the pin hole 1, and the mounting groove is provided with an ejection spring and a latch, the ejection spring pushes the latch toward the slide plate, so that the lower end of the latch extends into the pin hole 1, and the inclined surface provided at the lower end of the latch abuts against the opening of the pin hole 1; after the slide plate is inserted into the positioning groove, the inclined surface abuts against the opening of the pin hole 2. During the sliding of the slide plate, the pin slides with the opening of the pin hole one through the inclined surface, further guiding the sliding direction of the slide plate; after the slide plate enters the positioning groove, the inclined surface enters the pin hole two from the pin hole one, and the inclined surface abuts against the hole opening of the pin hole two, so that the hole wall of the yield hole does not have to directly abut against the bottom of the positioning groove, thereby realizing the limitation of the sliding stroke of the slide plate, and the locking spring can still maintain the preload force.

[0017] In summary, the beneficial effects of the present invention compared with the prior art are as follows: This joint is used as a connector between the downpipe and the drain pipe of the sink. First, the locking mechanism is used to lock the interface 1 and the interface 2, so that the seal is in a rebound state. The interface 1 is connected to the downpipe opening through the slot, and the interface 2 is connected to the drain pipe of the sink, so that the connection between the drain pipe of the sink and the downpipe can be achieved. After the locking mechanism releases the lock between the interface 1 and the interface 2, the preloaded part will move the interface 1 and the center pipe upward through the step surface, the limit cap will move upward and press the seal onto the interface 1, the seal will deform and seal the gap between the downpipe and the center pipe, so as to achieve the seal between the joint and the downpipe, and the sealing effect is better. Pressing down the interface 2 can release the squeeze of the limit cap on the seal. After the seal is reset, the joint can be easily pulled out from the downpipe, and loading and unloading are more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the external structure of the first embodiment; Figure 2 for Figure 1 A cross-sectional schematic diagram of Figure 3 for Figure 1 Schematic diagram of the explosion structure; Figure 4 It is a partial cross-sectional schematic diagram of Embodiment 1; Figure 5 This is a schematic diagram of the connection between the first embodiment and the sewer pipe, mainly used to show the state of the locking mechanism after locking; Figure 6 for Figure 5 A schematic diagram of the changing state of the locking mechanism, mainly used to show the state after the locking mechanism is unlocked; Figure 7 is a cross-sectional schematic diagram of embodiment 2; Figure 8 This is a schematic diagram of the external structure of the third embodiment; Fig. 9 for Figure 8 A cross-sectional schematic diagram of Fig.10 It is a structural schematic diagram of a slide plate in Embodiment 3; Fig.11 It is a partial explosion diagram of Example 3; Fig.12 It is a partial cross-sectional schematic diagram of Embodiment 3; Fig.13 This is a schematic diagram of the connection of the third embodiment with a sewer pipe; Fig.14 for Fig.13 Schematic diagram of the changing state.

[0019] Reference numerals: 1, sewer pipe; 100, interface 1; 110, slot; 120, positioning slot; 200, interface 2; 210, center tube; 211, step surface; 220, limit cap; 221, air groove; 222, limit boss; 223, floor drain core; 230, guide groove; 240, assembly groove; 250, positioning block; 260, arc guard plate; 270, installation groove; 271, ejector spring; 272, latch; 2721, inclined surface; 2722, convex block; 300, preloaded parts; 400, sealing member; 410, sealing ring; 420, separating ring; 430, pressing ring; 500, locking mechanism; 510, slide plate; 511, clearance hole; 512, vertical plate; 513, pin hole 1; 514, pin hole 2; 520, locking spring. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Embodiment 1:

[0021] A sewer pipe sealing joint, such as Figure 1-Figure 6As shown, it includes an interface 100, an interface 200, a preload 300 and a sealing member 400. The interface 100 has a connection slot 110 for the sewer pipe 1. The interface 200 is slidably arranged on the outside of the interface 100. The interface 200 is used to connect the drain pipe. A central tube 210 is arranged in the interface 200. The lower end of the central tube 210 passes through the interior of the interface 100 and can extend into the sewer pipe 1. The sealing member 400 can be elastically deformed and sleeved on the outside of the central tube 210. The lower end of the central tube 210 can also be A limiting cap 220 is provided for limiting the seal 400; a step surface 211 is provided on the interface 200 and / or the central tube 210, and the preload member 300 is provided between the step surface 211 and the interface 1 100. The preload member 300 applies an upward force to the step surface 211, so that the limiting cap 220 moves upward and cooperates with the interface 1 100 to squeeze the seal 400. The seal 400 is deformed and seals the gap between the central tube 210 and the sewer pipe 1, that is, the pipe mouth of the sewer pipe 1 is sealed by the seal 400.

[0022] Specifically, the upper end of the second interface 200 is provided with a thread, and the drain pipe of the sink can be connected to the second interface 200 through the thread; as another solution, the drain pipe of the sink is directly inserted into the second interface 200 or the central tube 210, so that the drain pipe of the sink is interference-fitted with the second interface 200 or the central tube 210. The step surface 211 can be provided inside the second interface 200 or outside the central tube 210, or a step surface 211 can be provided on both the second interface 200 and the central tube 210, as long as the pre-tightening member 300 can apply a pre-tightening force to the second interface 200 in a direction away from the first interface 100. The pre-tightening member 300 is a spring or two magnetic blocks. When two magnetic blocks are used, the magnetic force between the two magnetic blocks is a repulsive force.

[0023] The outer wall of the limiting cap 220 has a limiting boss 222 , and the limiting cap 220 limits the sealing member 400 via the limiting boss 222 to prevent the sealing member 400 from falling off the limiting cap 220 .

[0024] The seal 400 includes at least one annular sealing ring 410, the cross-section of the sealing ring 410 is arc-shaped, and the sealing ring 410 can be deformed laterally; in some embodiments, the seal 400 is an O-ring, and the seal 400 only needs to have elastic deformation performance.

[0025] like Figure 1 As shown, the limiting cap 220 is connected to the central tube 210 by snap-fitting or threading, and the outer wall of the limiting cap 220 is slidably matched with the inner wall of the sewer pipe 1; a plurality of air grooves 221 are provided on the side wall of the limiting cap 220 to prevent the side wall of the limiting cap 220 from adhering to the inner wall of the sewer pipe 1.

[0026] like Figure 6As shown, the limiting cap 220 is clamped or threaded with a floor drain core 223, which connects the sewer pipe 1 with the central pipe 210, and the sewage in the central pipe 210 can be discharged into the sewer pipe 1 through the floor drain core 223. The floor drain core 223 is an anti-odor floor drain core, and the provision of the floor drain core 223 can further enhance the anti-odor effect of the joint.

[0027] like Figure 2-Figure 4 As shown, a positioning groove 120 is provided on the outer wall of the interface 100; a locking mechanism 500 is provided on the interface 200, and the locking mechanism 500 includes a slide plate 510 and a locking spring 520. The slide plate 510 is slidably arranged in the guide groove 230 provided at the lower end of the interface 200, and the center of the slide plate 510 has a clearance hole 511 for the upper end of the interface 100 to pass through. A vertical plate 512 is provided on the side of the slide plate 510, and the locking spring 520 is arranged between the vertical plate 512 and the interface 200. The locking spring 520 applies a pre-tightening force to the vertical plate 512, so that the hole wall of the clearance hole 511 away from the vertical plate 512 is pressed against the outer wall of the interface 100, and as the interface 200 moves, the slide plate 510 can be inserted into the positioning groove 120.

[0028] The thickness of the slide plate 510 is smaller than the height of the positioning groove 120 , or only the thickness of the portion of the slide plate 510 that enters the positioning groove 120 is smaller than the height of the positioning groove 120 , as long as the slide plate 510 can slide smoothly in the positioning groove 120 .

[0029] like Figure 4 As shown, the outer wall of the second interface 200 is provided with a mounting groove 240 and / or a positioning block 250, and the mounting groove 240 and / or the positioning block 250 limit one end of the locking spring 520, and the other end of the locking spring 520 is pressed against the vertical plate 512; or, the mounting groove 240 and / or the positioning block 250 are provided on the vertical plate 512. In other words, the mounting groove 240 is used to clamp the outer ring of the locking spring 520, and the positioning block 250 is used to clamp the inner ring of the locking spring 520. Both the mounting groove 240 and the positioning block 250 are used to limit the locking spring 520, and the two can be set selectively or simultaneously; correspondingly, the mounting groove 240 and the positioning block 250 can also be set on the vertical plate 512 or the second interface 200, and the purpose is to avoid abnormal displacement of the locking spring 520.

[0030] The outer wall of the interface 200 is provided with an arc-shaped guard plate 260, and the vertical plate 512 is located on the inner side of the arc-shaped guard plate 260. The arc-shaped guard plate 260 is used to provide protection for the vertical plate 512 to prevent the vertical plate 512 or the locking spring 520 from interfering with external debris.

[0031] The working principle of the present invention is as follows: like Figure 2 , Figure 5As shown, before the connector connects the sewer pipe 1 to the drain pipe of the sink, the first interface 100 and the second interface 200 are locked by the locking mechanism 500, so that the sealing member 400 is in a relaxed state.

[0032] After that, the second interface 200 is connected to the drain pipe of the sink. The user holds the joint and inserts the limit cap 220 into the pipe opening of the downpipe 1. After the slot 110 is plugged into the pipe opening of the downpipe 1, the first interface 100 remains stationary. The user presses the vertical plate 512 to compress the locking spring 520, and the slide plate 510 slides along the guide groove 230. After the hole wall of the positioning hole 511 is separated from the positioning groove 120, the first interface 100 and the second interface 200 are in the unlocking group state. Figure 6 As shown, at this time, the preload member 300 will push the interface 200 and the slide plate 510 upwards. At the same time, the center tube 210 will drive the limit cap 220 and the seal 400 to move upwards as a whole. The limit cap 220 and the interface 100 can squeeze the seal 400. The height of the seal 400 is reduced and radially deformed, thereby sealing the gap between the center tube 210 and the sewer pipe 1, and the friction between the center tube 210 and the sewer pipe 1 increases accordingly, and the joint is difficult to be directly pulled out from the sewer pipe 1.

[0033] After the vertical plate 512 is released, the locking spring 520 is reset and pushes the vertical plate 512 to move, so that the hole wall of the accommodating hole 511 abuts against the outer wall of the upper end of the second interface 200 .

[0034] The interface 200 is pressed down, and the step surface 211 compresses the preload member 300 (taking the spring as an example), so that the center tube 210 and the limit cap 220 move downward as a whole, and the sealing member 400 automatically rebounds and resets after losing the limit of the limit cap 220, and the friction between the center tube 210 and the sewer pipe 1 is reduced, so that the interface 100 and the center tube 210 can be easily pulled out from the sewer pipe 1. Figure 5 As shown, until the slide plate 510 moves down to the positioning groove 120, the pre-tightening force applied by the locking spring 520 to the vertical plate 512 will cause the portion of the slide plate 510 away from the vertical plate 512 to be reinserted into the positioning groove 120, and at this time, the interface 1 100 and the interface 2 200 are locked. The disassembly and assembly of the joint is more convenient, and the sealing process of the seal 400 is easier and faster. Embodiment 2:

[0035] The difference between the second embodiment and the first embodiment is that: Figure 7 As shown, the sealing member 400 includes at least two sealing rings 410 . Two adjacent sealing rings 410 are separated by a separation ring 420 , and the separation ring 420 is slidably disposed on the outer wall of the central tube 210 . Embodiment three:

[0036] The difference between the third embodiment and the first embodiment is that: Figure 8-Figure 14As shown, the slide plate 510 is provided with a connected pin hole 1 513 and a pin hole 2 514, the pin hole 1 513 and the vertical plate 512 are symmetrically distributed on both sides of the slide plate 510, and the pin hole 1 513 is connected to the clearance hole 511, the pin hole 2 514 is close to the outer end of the slide plate 510, and the width of the pin hole 2 514 is smaller than the width of the pin hole 1 513; the lower end of the interface 200 is provided with a mounting groove 270 connected to the pin hole 1 513, and a ejection hole is provided in the mounting groove 270 Spring 271, latch 272, latch 272 is located at the notch of mounting slot 270, ejecting spring 271 pushes latch 272 toward slide plate 510, so that the lower end of latch 272 extends into pin hole 1 513, and the inclined surface 2721 set at the lower end of latch 272 abuts against the opening of pin hole 1 513; after slide plate 510 is inserted into positioning slot 120 through the hole wall of the clearance hole 511 on the side away from vertical plate 512, the inclined surface 2721 abuts against the opening of pin hole 2 514.

[0037] In some embodiments, a protrusion 2722 passing through the pin hole 1 513 is further provided at the lower end of the inclined surface 2721 , and the protrusion 2722 can prevent the lower end of the pin 272 from being separated from the pin hole 1 513 or the pin hole 2 514 .

[0038] During the unlocking process of the slide plate 510, the inclined surface 2721 at the lower end of the latch 272 slides along the pin hole 2 514 to the opening of the pin hole 1 513; when the interface 1 100 and the interface 2 200 are locked, the inclined surface 2721 at the lower end of the latch 272 slides from the pin hole 1 513 to the opening of the pin hole 2 514.

[0039] In other words, under the premise that the slide plate 510 and the guide groove 230 are slidably matched, the latch pin 272 cooperates with the pin hole 1 513 to further guide the slide plate 510, thereby achieving a double guiding effect on the slide plate 510.

[0040] In at least one embodiment, the interface 100 and the sealing ring 410 are in contact through the pressure ring 430, and the pressure ring 430 is slidably set on the outer wall of the central tube 210, so as to prevent the sealing ring 410 from sticking to the interface 100 after the sealing ring 410 is against the interface 100 for a long time.

[0041] The specific embodiments described in this article are merely illustrative of the spirit of the present invention; technicians in the technical field to which the present invention belongs may make various modifications or additions to the described specific embodiments or replace them in a similar manner, but will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A sewer pipe sealing joint, characterized in that: The invention comprises an interface 1 (100), an interface 2 (200), a pre-tightening member (300) and a sealing member (400), wherein the interface 1 (100) is provided with a slot (110) for connecting a sewer pipe (1), the interface 2 (200) is slidably arranged outside the interface 1 (100), and the interface 2 (200) is used to connect a sewer pipe; a central tube (210) is arranged inside the interface 2 (200), and the lower end of the central tube (210) passes through the interior of the interface 1 (100) and can extend into the sewer pipe (1), the sealing member (400) is arranged outside the central tube (210), and the central tube (210) is provided with a central tube (210). The lower end of the tube (210) is also provided with a limiting cap (220) for limiting the position of the sealing member (400); a step surface (211) is provided on the interface 2 (200) and / or the central tube (210); the pre-tightening member (300) is provided between the step surface (211) and the interface 1 (100); the pre-tightening member (300) applies an upward force to the step surface (211), so that the limiting cap (220) moves upward and cooperates with the interface 1 (100) to squeeze the sealing member (400); the sealing member (400) is deformed and seals the pipe mouth of the sewer pipe (1).

2. The sewer pipe sealing joint according to claim 1, characterized in that: The sealing member (400) comprises at least one annular sealing ring (410), and the sealing ring (410) is elastically deformable.

3. The sewer pipe sealing joint according to claim 2, characterized in that: At least two sealing rings (410) are provided, and a separation ring (420) is provided between adjacent sealing rings (410). The separation ring (420) is slidably provided on the outer wall of the central tube (210).

4. The sewer pipe sealing joint according to claim 2, characterized in that: The limiting cap (220) is provided with a floor drain core (223), and the floor drain core (223) can connect the central pipe (210) with the sewer pipe (1).

5. The sewer pipe sealing joint according to claim 1, characterized in that: The limiting cap (220) is detachably connected to the central tube (210).

6. The sewer pipe sealing joint according to claim 1, characterized in that: The limiting cap (220) is slidably matched with the inner wall of the down pipe (1).

7. The sewer pipe sealing joint according to any one of claims 1 to 6, characterized in that: The outer wall of the interface 1 (100) is provided with a positioning groove (120), and the interface 2 (200) is provided with a locking mechanism (500), and the locking mechanism (500) includes a slide plate (510) and a locking spring (520). The slide plate (510) is slidably arranged in the guide groove (230) at the lower end of the interface 2 (200), and the slide plate (510) has a clearance hole (511) for the upper end of the interface 1 (100) to pass through. A vertical plate (512) is arranged on the slide plate (510), and the locking spring (520) is arranged between the vertical plate (512) and the second interface (200). The locking spring (520) applies a pre-tightening force to the vertical plate (512), so that the hole wall of the clearance hole (511) is pressed against the outer wall of the first interface (100). As the second interface (200) moves, the slide plate (510) can be inserted into the positioning groove (120).

8. The sewer pipe sealing joint according to claim 7, characterized in that: The outer wall of the interface 2 (200) is provided with an assembly groove (240) and / or a positioning block (250), and the assembly groove (240) and / or the positioning block (250) limit one end of the locking spring (520), and the other end of the locking spring (520) is pressed against the vertical plate (512); or, the assembly groove (240) and / or the positioning block (250) are arranged on the vertical plate (512).

9. The sewer pipe sealing joint according to claim 8, characterized in that: The outer wall of the second interface (200) is provided with an arc-shaped guard plate (260), and the vertical plate (512) is located on the inner side of the arc-shaped guard plate (260).

10. The sewer pipe sealing joint according to claim 7, characterized in that: The slide plate (510) is provided with a pin hole 1 (513) and a pin hole 2 (514) which are connected to each other. The pin hole 1 (513) and the vertical plate (512) are symmetrically distributed on both sides of the slide plate (510), and the pin hole 1 (513) is connected to the clearance hole (511), and the pin hole 2 (514) is close to the outer end of the slide plate (510); the interface 2 (200) is provided with a mounting groove (270) connected to the pin hole 1 (513), and the mounting groove (270) is provided with a mounting groove (270) An ejection spring (271) and a latch (272) are provided, and the ejection spring (271) pushes the latch (272) toward the slide plate (510), so that the lower end of the latch (272) extends into the first pin hole (513), and the inclined surface (2721) provided at the lower end of the latch (272) abuts against the opening of the first pin hole (513); after the slide plate (510) is inserted into the positioning groove (120), the inclined surface (2721) abuts against the opening of the second pin hole (514).

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