Sewer line sealing joint

Abstract

The utility model discloses a sewer pipe sealing joint, which belongs to the technical field of pipe fittings, and is characterized by comprising a connector I, a connector II, a pre-tightening piece and a sealing piece, the connector I is provided with a sewer pipe connecting slot, the connector II is arranged outside the connector I in a sliding manner, and the connector II 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 utility model belongs to the technical field of pipeline accessories, in particular to a sealing joint for a sewer pipe. Background Art

[0002] Washbasins, bathtubs, and other kitchen and bathroom fixtures, as well as vegetable sinks, all have drains, and drains are usually fitted with drains. The main function of a drain is to drain and store water from the fixtures. For example, Chinese patent publication number CN218374221U discloses a water pipe for a sink that prevents foam overflow. This pipe is connected to the drain pipe at the bottom by providing a water seal body and a water seal cover. This seal creates a water passageway and prevents odor. The drain pipe needs to be inserted into the sewer pipe to drain the sink, but a gap often exists between the drain pipe and the sewer pipe, resulting in poor airtightness. This gap is prone to odor overflow, foam backflow, or the harboring of insects and ants.

[0003] Therefore, an applicant designed an odor-proof sealed connection joint for a sewer pipe (publication number CN109723109A), which includes an upper connecting pipe and a lower connecting pipe. The upper connecting pipe is composed of a main body, a threaded pipe, a gasket, a rubber pad and a tightening cover. The main body is composed of a thick pipe with a thin pipe connected to the upper end. The threaded pipe is connected to the upper part of the thick pipe part of the main body. The gasket is sleeved on the thin pipe part of the main body. The tightening cover is connected to the threaded pipe through a thread. The rubber pad is C-shaped, and the rubber pad is sleeved on the thin pipe part of the main body. It is located above the gasket, and the rubber pad is in contact with the tightening cover. The lower connecting pipe is composed of a thick pipe with a thin pipe connected to the upper end of the thick pipe. The thin pipe part of the lower connecting pipe is inserted into the thick pipe of the main body of the upper connecting pipe. The thin tube part of the main pipe is inserted into the basin drain pipe, and the thick tube part of the lower connecting pipe is sleeved on the sewer pipe and 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 sewer pipe.

[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. Utility Model Content

[0005] The purpose of the present invention is to solve the above-mentioned problems 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:

[0007] A sewer pipe sealing joint, comprising interface one, interface two, a pre-tightening member and a sealing member, wherein the interface one is provided with a slot for connecting the sewer pipe, the interface two is slidably arranged outside the interface one, and the interface two is used to connect the drainage pipe; a central tube is arranged in the interface two, the lower end of the central tube passes through the interior of the interface one and can extend into the sewer pipe, the sealing member is arranged outside the central tube, and the lower end of the central tube is also provided with a limiting cap for limiting the seal; a step surface is provided on the interface two and / or the central tube, the pre-tightening member is arranged between the step surface and the interface one, the pre-tightening member applies an upward force to the step surface, so that the limiting cap moves upward and cooperates with the interface one to squeeze the sealing member, the sealing member deforms and seals the pipe mouth of the sewer pipe.

[0008] Through the above technical solution, interface 2 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 connected to the port of the sewer pipe, interface 1 remains stationary, and the preloaded part will push interface 2 and the center pipe upward as a whole. The limiting cap also drives the seal to move upward at the same time. After the seal and interface 1 are abutted, the limiting cap and interface 1 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 2 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 1, so that interface 1 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.

[0009] In the above-mentioned sewer pipe sealing joint, the sealing member includes at least one annular sealing ring that is elastically deformable. By using the elastic sealing ring as the sealing member, the airtightness between the central pipe and the sewer pipe can be effectively improved.

[0010] In the aforementioned sewer pipe sealing joint, at least two sealing rings are provided, with a spacer ring disposed between adjacent sealing rings. The spacer ring is slidably mounted on the outer wall of the central pipe. The two or more sealing rings are separated by the spacer ring to ensure that the sealing rings are evenly stressed when squeezed, thereby improving the sealing effect.

[0011] In the aforementioned sewer pipe sealing joint, a floor drain core is provided on the limit cap, which connects the central pipe with the sewer pipe. The provision of the floor drain core can improve the odor-proof performance of the central pipe and prevent odor in the sewer pipe from escaping upward from the central pipe.

[0012] In the above-mentioned sewer pipe sealing joint, the limiting cap is detachably connected to the central pipe. Through this arrangement, the difficulty of assembling the limiting cap and the sealing member can be reduced.

[0013] In the aforementioned sewer pipe sealing joint, the stop cap is in sliding engagement with the inner wall of the sewer pipe. After the first interface is plugged into the sewer pipe, the stop 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.

[0014] 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 out of the positioning groove, interface one and interface two are unlocked, and the two can slide relative to each other.

[0015] In the aforementioned sewer pipe sealing joint, the outer wall of the second interface is provided with an assembly groove and / or a positioning block, which limits one end of the locking spring, while the other end of the locking spring abuts against the vertical plate; alternatively, the assembly groove and / or positioning block are provided on the vertical plate. Both the assembly groove and the positioning block can limit the end of the locking spring. Regardless of whether the assembly groove or positioning block is provided on the second interface or the vertical plate, as long as they can limit the end of the locking spring, they can ensure that the locking spring exerts a stable force on the vertical plate.

[0016] 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.

[0017] 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, the pin slides with the opening of the pin hole one through the inclined surface, further guiding the sliding direction of the slide; after the slide 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 give way 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, and the locking spring can still maintain the preload force.

[0018] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0019] This connector is used as a connector for the downpipe and the drainpipe of the sink. First, the locking mechanism locks interface 1 and interface 2, so that the seal is in a resilient state. Interface 1 is connected to the downpipe opening through a slot, and interface 2 is connected to the drainpipe of the sink, thereby achieving the connection between the drainpipe of the sink and the downpipe. After the locking mechanism releases the lock between interface 1 and interface 2, the pre-tightening member moves interface 1 and the center pipe upwards via the stepped surface, and the limiting cap moves upwards and presses the seal against interface 1. The seal deforms and seals the gap between the downpipe and the center pipe, thereby achieving a seal between the connector and the downpipe, achieving a better sealing effect. Pressing down interface 2 releases the pressure of the limiting cap on the seal. After the seal is reset, the connector can be easily pulled out of the downpipe, making assembly and disassembly more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the external structure of embodiment 1;

[0021] Figure 2 for Figure 1 A cross-sectional schematic diagram;

[0022] Figure 3 for Figure 1 Schematic diagram of the explosion structure;

[0023] Figure 4 It is a partial cross-sectional schematic diagram of embodiment 1;

[0024] 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;

[0025] Figure 6 for Figure 5 The schematic diagram of the change of is mainly used to show the state of the locking mechanism after it is unlocked;

[0026] Figure 7 is a cross-sectional schematic diagram of embodiment 2;

[0027] Figure 8 This is a schematic diagram of the external structure of Example 3;

[0028] Figure 9 for Figure 8 A cross-sectional schematic diagram;

[0029] Figure 10 This is a schematic structural diagram of the slide plate in Example 3;

[0030] Figure 11 This is a partial explosion diagram of Example 3;

[0031] Figure 12 It is a partial cross-sectional schematic diagram of embodiment 3;

[0032] Figure 13 This is a schematic diagram of embodiment 3 connected to a sewer pipe;

[0033] Figure 14 for Figure 13 Schematic diagram of the changes.

[0034] Reference numerals: 1, sewer pipe; 100, interface 1; 110, slot; 120, positioning slot;

[0035] 200, interface 2; 210, center tube; 211, stepped surface; 220, limiting cap; 221, air groove; 222, limiting boss; 223, floor drain core; 230, guide groove; 240, assembly groove; 250, positioning block; 260, curved guard plate; 270, mounting groove; 271, ejector spring; 272, latch; 2721, inclined surface; 2722, boss;

[0036] 300, preloaded parts;

[0037] 400, sealing element; 410, sealing ring; 420, separating ring; 430, pressure ring;

[0038] 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

[0039] 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. Example 1:

[0040] A sewer pipe sealing joint, such as Figures 1-6 As shown, it includes an interface 100, an interface 200, a pre-tightening member 300 and a sealing member 400. The interface 100 has a connection slot 110 for the sewer pipe 1, and 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, and 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 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 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.

[0041] Specifically, the upper end of the second interface 200 is provided with threads, and the sink drain pipe and the second interface 200 can be connected by threads. As another solution, the sink drain pipe can be directly inserted into the second interface 200 or the center tube 210, so that the sink drain pipe and the second interface 200 or the center tube 210 have an interference fit. The stepped surface 211 can be provided inside the second interface 200 or outside the center tube 210, or both the second interface 200 and the center tube 210 can be provided with a stepped surface 211, as long as the preload member 300 can apply a preload force to the second interface 200 in a direction away from the first interface 100. The preload member 300 is a spring or two magnets. When two magnets are used, the magnetic force between the two magnets is a repulsive force.

[0042] 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 .

[0043] 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 it is sufficient to ensure that the seal 400 has elastic deformation performance.

[0044] 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 slides 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.

[0045] like Figure 6 As shown, a floor drain core 223 is clipped or threaded onto the limiting cap 220. The floor drain core 223 connects the sewer pipe 1 with the central pipe 210, and 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 odor-proof floor drain core, and the provision of the floor drain core 223 can further enhance the odor-proof effect of the joint.

[0046] 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 set in the guide groove 230 opened at the lower end of the interface 200. 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 provided 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. As the interface 200 moves, the slide plate 510 can be stuck in the positioning groove 120.

[0047] The thickness of the slide plate 510 is smaller than the height of the positioning groove 120 , or the thickness of only 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 .

[0048] like Figure 4 As shown, the outer wall of the second interface 200 is provided with an assembly groove 240 and / or a positioning block 250. 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 abuts against the vertical plate 512. Alternatively, the assembly groove 240 and / or the positioning block 250 are provided on the vertical plate 512. In other words, the assembly 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 assembly groove 240 and the positioning block 250 are used to limit the locking spring 520. Either one of them can be provided, or both can be provided. Accordingly, the assembly groove 240 and the positioning block 250 can also be provided on the vertical plate 512 or the second interface 200 to prevent abnormal displacement of the locking spring 520.

[0049] The outer wall of the interface 200 is provided with an arc-shaped guard plate 260, and the vertical plate 512 is located inside 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.

[0050] The working principle of this utility model is as follows:

[0051] like Figure 2 、 Figure 5 As 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.

[0052] Then, connect the second interface 200 to the drain pipe of the sink. The user holds the joint and inserts the limit cap 220 into the pipe opening of the sewer pipe 1. After the slot 110 is plugged into the pipe opening of the sewer pipe 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 unlocked group state. Figure 6 As shown, at this time, the preloaded part 300 will push the interface 200 and the slide plate 510 upwards. At the same time, the center tube 210 will drive the limiting cap 220 and the seal 400 to move upwards as a whole. The limiting 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.

[0053] After the vertical plate 512 is released, the locking spring 520 returns to its original position and pushes the vertical plate 512 to move, so that the hole wall of the clearance hole 511 abuts against the outer wall of the upper end of the second interface 200 .

[0054] Press the second interface 200 downward, and the step surface 211 compresses the pre-tightening member 300 (using a spring as an example), so that the central tube 210 and the limiting cap 220 move downward as a whole. The sealing member 400 automatically rebounds and resets after losing the limit of the limiting cap 220, and the friction between the central tube 210 and the sewer pipe 1 is reduced. Then, the first interface 100 and the central 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 on 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. At this time, the first interface 100 and the second interface 200 are locked. This connector is more convenient to disassemble and assemble, and the sealing process of the seal 400 is easier and faster. Example 2:

[0055] 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 separator ring 420 , and the separator ring 420 is slidably disposed on the outer wall of the central tube 210 . Example 3:

[0056] The difference between the third embodiment and the first embodiment is that: Figures 8-14 As 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. 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. A ejector is provided in the mounting groove 270. The spring 271 and the latch 272 are located in the notch of the mounting slot 270. The ejector spring 271 pushes the latch 272 toward the slide 510, so that the lower end of the latch 272 extends into the pin hole 1 513, and the inclined surface 2721 provided at the lower end of the latch 272 abuts against the opening of the pin hole 1 513; after the slide 510 is inserted into the positioning slot 120 through the wall of the clearance hole 511 on the side away from the vertical plate 512, the inclined surface 2721 abuts against the opening of the pin hole 2 514.

[0057] In some embodiments, a protrusion 2722 that passes through the first pin hole 513 is further provided at the lower end of the inclined surface 2721 . The protrusion 2722 can prevent the lower end of the pin 272 from being disengaged from the first pin hole 513 or the second pin hole 514 .

[0058] 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.

[0059] 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.

[0060] 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 center tube 210, thereby preventing the sealing ring 410 from sticking to the interface 100 after the sealing ring 410 rests on the interface 100 for a long time.

[0061] The specific embodiments described in this article are merely examples of the spirit of the present invention; technicians in the technical field of the present invention may make various modifications or additions to the described specific embodiments or replace them in a similar manner, but they 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 by: 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 connection slot (110) for 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 drainage pipe; a central tube (210) is arranged inside the interface 2 (200), 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 second interface (200) and / or the central tube (210), and the pre-tightening member (300) is provided between the step surface (211) and the first interface (100), and 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 first interface (100) to squeeze the sealing member (400), and 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: A floor drain core (223) is provided on the limiting cap (220), 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 in sliding engagement with the inner wall of the sewer 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 provided on the slide plate (510), and the locking spring (520) is provided 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 stuck in 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 provided 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 inside 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) which is connected to the pin hole 1 (513), and the mounting groove (270) is provided with a mounting groove (270) which is connected to the pin hole 1 (513). An ejection spring (271) and a latch (272) are provided. 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 pin hole 1 (513), and the inclined surface (2721) provided at the lower end of the latch (272) abuts against the opening of the pin hole 1 (513); after the slide plate (510) is inserted into the positioning groove (120), the inclined surface (2721) abuts against the opening of the pin hole 2 (514).

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