CN212801816U

CN212801816U - Bathtub drainer

Info

Publication number: CN212801816U
Application number: CN202021462390.1U
Authority: CN
Inventors: 章瑾
Original assignee: Zhejiang Runshang Kitchen Technology Co ltd
Current assignee: Zhejiang Runshang Kitchen Technology Co ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-03-26
Anticipated expiration: 2030-07-22

Abstract

The utility model provides a bathtub drainer belongs to articles for daily use field. It has solved current bathtub hydrophone down and has installed the operation and waste time and energy the scheduling problem when the on-the-spot construction of bathtub. This hydrophone under bathtub, including offal body and overflow body, fixedly connected with connecting pipe one on the offal body, fixedly connected with connecting pipe two on the overflow body, connecting pipe one and connecting pipe two are made by the copper product material, connecting pipe one includes back straight tube section, ripple pipeline section and preceding straight tube section, be provided with on the medial surface of preceding straight tube section front end and be annular fixed slot, the fixed slot internal fixation has the sealing washer of being made by rubber materials, the rear end of connecting pipe two inserts in the preceding straight tube section and the medial surface elasticity of sealing washer is hugged closely on the lateral surface of connecting pipe two, be provided with convex shoulder on the lateral surface of connecting pipe two front ends, the convex shoulder can lean on the preceding terminal surface in connecting pipe one. The bathtub drainer is time-saving and labor-saving in installation and operation and convenient to operate when in site construction of the bathtub.

Description

Bathtub drainer

Technical Field

The utility model belongs to articles for daily use field relates to a bathtub hydrophone down.

Background

In daily life, methods of bathing include showering and bathing in a tub. The bathtub needs to be provided with a bathtub in a bathroom, and the bathtub is provided with a water outlet and an overflow port. The water outlet is arranged at the bottom of the bathtub and used for draining bath water in the bathtub; the overflow port is arranged on the side wall of the upper end of the bathtub and is used for discharging redundant water and preventing the water from overflowing out of the bathtub and flowing to the floor of a bathroom. A drainer is installed at the drain port and the overflow port, and water is guided into the drain pipe through the drainer, thereby draining the water.

Chinese patent literature document discloses a bathtub drainer [ application number: CN 01239200; publication No.: 1257756A ] composed of a downpipe, a corrugated pipe, a straight pipe, an overflow bent pipe and a trapezoidal rubber ring, wherein the downpipe and the overflow bent pipe are communicated through the corrugated pipe and the straight pipe, the trapezoidal rubber ring is arranged at the joint of the corrugated pipe and the straight pipe, the trapezoidal rubber ring is pressed to tightly hoop the straight pipe through a male screw and a nut on the mouth of the corrugated pipe, and the length of the straight pipe is randomly adjusted according to construction requirements, so that the bathtub drainer is convenient to install, and is air-tight and water-tight.

When the bathtub drainer is installed, the length of the overlapped part of the flat pipe and the corrugated pipe is calculated, then the upper end of the corrugated pipe is sleeved on the flat pipe, the length of the flat pipe inserted into the corrugated pipe is the calculated length, then the screw cap is screwed down, the trapezoidal sealing ring hoops the corrugated pipe by screwing the screw cap, so that the flat pipe and the corrugated pipe are kept in a fixed state, the flat pipe is prevented from falling into the corrugated pipe as a whole because the flat pipe is not fixed with the corrugated pipe, then the downpipe is fixed at a drainage port of the bathtub, the overflow bent pipe is fixed at an overflow port of the bathtub, the corrugated pipe is bent to a required angle, then the lower end of the corrugated pipe is fixed with the downpipe, and then the upper end of the flat pipe is fixed with the overflow bent pipe. If the butt joint height or the butt joint angle between the flat straight pipe and the overflow bent pipe cannot be completed, the nut between the corrugated pipe and the flat straight pipe needs to be unscrewed, the height and the bending angle of the corrugated pipe are readjusted, then the upper end of the flat straight pipe is connected with the overflow bent pipe, and then the nut between the corrugated pipe and the flat straight pipe is screwed down. Make straight pipe and bellows keep fixed through screwing up the nut in the installation, make straight pipe and bellows remove fixedly through unscrewing the nut, often need screw up and unscrew the operation to the nut and accomplish the fixed and the adjustment of length between the two between bellows and the straight pipe in the in-process of installing the hydrophone down on the bathtub like this, and need exert oneself during the operation nut and just can realize screwing up and unscrewing to lead to hydrophone installation operation time wasting time and energy when the on-the-spot construction of bathtub down.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, provide a bathtub hydrophone down, solved current bathtub hydrophone down and installed the technical problem that the operation is wasted time and energy when the construction of bathtub scene.

The purpose of the utility model can be realized by the following technical proposal:

a bathtub drainer comprises a drainer body and an overflow body, wherein the drainer body is fixedly connected with a first connecting pipe, the overflow body is fixedly connected with a second connecting pipe, it is characterized in that the first connecting pipe and the second connecting pipe are both made of copper materials, the first connecting pipe comprises a rear straight pipe section connected with the lower water body, a front straight pipe section connected with the second connecting pipe and a corrugated pipe section positioned between the rear straight pipe section and the front straight pipe section, an annular fixing groove is arranged on the inner side surface of the front end of the front straight pipe section, a sealing ring made of rubber material is fixed in the fixing groove, the rear end of the second connecting pipe is inserted into the front straight pipe section, the inner side surface of the sealing ring is elastically attached to the outer side surface of the second connecting pipe, and a convex shoulder is arranged on the outer side surface of the front end of the second connecting pipe and can be abutted against the front end surface of the first connecting pipe.

When assembling, the drainage body and the overflow body are fixedly connected to the bathtub; the first connecting pipe and the second connecting pipe are connected, namely the sealing ring is fixed in the fixing groove, the rear end of the second connecting pipe is inserted into the front straight pipe section of the first connecting pipe, the inner side surface of the sealing ring is elastically attached to the outer side surface of the second connecting pipe, so that sealing is formed between the sealing ring and the second connecting pipe, the rubber sealing ring is elastically deformed to form friction force between the sealing ring and the second connecting pipe, and the first connecting pipe and the second connecting pipe are kept fixed under the condition of no external force; then bending the corrugated pipe section to enable the front straight pipe section and the rear straight pipe section to form a certain included angle; then erecting the first connecting pipe to enable the front straight pipe section to face upwards; then connecting the rear straight pipe section with the lower water body; and then, drawing out a part of the second connecting pipe from the front straight pipe section to connect the front end of the second connecting pipe with the overflow body.

The first connecting pipe is made of a copper material, so that the first connecting pipe has certain structural strength, the first connecting pipe can keep a bending deformation state after the corrugated pipe section is bent and deformed, the front straight pipe section cannot collapse downwards after being erected, meanwhile, the second connecting pipe is also made of the copper material, and the second connecting pipe also has certain structural strength, so that the connecting part of the first connecting pipe and the second connecting pipe keeps structural stability after being installed, the sealing ring keeps a sealing state, and the drainer has good sealing performance and use stability.

The sealing ring is fixed in the fixing groove, the inner side surface of the sealing ring is directly attached to the connecting pipe two in an elastic mode, a convex shoulder is arranged on the outer side surface of the connecting pipe two, in the field construction and installation process, only the connecting pipe two needs to be inserted into the connecting pipe one, on one hand, the connecting pipe one and the connecting pipe two are kept fixed under the action of no external force through friction force formed between the sealing ring and the connecting pipe two, on the other hand, the connecting pipe two can be prevented from falling into the connecting pipe two under the action of the external force through the limiting effect of the convex shoulder, and the connecting pipe two can be rapidly and smoothly pulled out from the connecting pipe one. Therefore compare with current bathtub hydrophone down, this bathtub hydrophone down does not need to make the sealing washer cramp the fixed of second assurance connecting pipe of connecting pipe through screwing up the nut when the on-the-spot construction of bathtub, also need not unscrew the nut and make and can adjust length between connecting pipe one and the connecting pipe two to make this bathtub hydrophone down install operation labour saving and time saving, convenient operation when the on-the-spot construction of bathtub.

In the bathtub drainer, a rounding or chamfer is arranged between the rear end surface and the outer side surface of the second connecting pipe. The rounding or the chamfering has a guiding function, so that the second connecting pipe can be quickly and smoothly inserted into the first connecting pipe, and the installation and the operation of the bathtub drainer on site construction of the bathtub are time-saving and labor-saving.

In the bathtub drainer, a gap is formed between the outer side surface of the rear end of the connecting pipe and the inner side surface of the front straight pipe section. The sliding friction between the first connecting pipe and the second connecting pipe is avoided through the arrangement of the gap, friction exists between the second connecting pipe and the sealing ring, the second connecting pipe can be quickly and easily inserted into the front straight pipe section of the first connecting pipe and can be quickly and easily drawn out from the front straight pipe section, and time and labor are saved during installation and operation of the bathtub drainer during field construction of the bathtub.

In the bathtub drainer, the drainer body comprises an upper water inlet end, a side water inlet end and a lower water outlet end, the side water inlet end is fixedly connected with a rear straight pipe section of the first connecting pipe, the lower water outlet end is fixedly connected with a tail pipe, a loose joint nut is sleeved on the tail pipe, a convex ring is arranged on the inner side surface of the lower end of the loose joint nut, a baffle protrusion is arranged on the outer side surface of the upper end of the tail pipe, the upper end of the loose joint nut is sleeved on the lower water outlet end and forms threaded connection, and the convex ring is positioned below the baffle protrusion and is abutted against the baffle protrusion.

The lower water outlet end of the sewer body is connected with the drainage pipeline through the tail pipe, the lower end of the tail pipe is inserted into the drainage pipeline during assembly, then the position of the bathtub is adjusted, the upper end of the tail pipe is opposite to the lower water outlet end of the sewer body, the upper end of the loose joint screw cap is sleeved on the lower water outlet end and screwed down, the convex ring abuts against the blocking protrusion, and then a sealing object is filled between the tail pipe and the drainage pipeline, so that the tail pipe is installed. The tail pipe is stably fixed at the lower water outlet end of the launching body through the loose joint nut, and the loose joint function is realized through the loose joint nut, so that the bathtub launching device is time-saving and labor-saving in installation and operation when in site construction of a bathtub.

In the bathtub drainer, the upper end of the tail pipe is inserted with a sealing sleeve ring made of plastic, the edge of the upper end of the sealing sleeve ring is turned outwards to form a blocking edge, the blocking edge abuts against the upper end face of the blocking protrusion, and a sealing gasket made of rubber material is clamped and fixed between the blocking edge and the end face of the lower water outlet end. The sealing performance between the tail pipe and the lower water outlet end is improved by arranging the sealing lantern ring and the sealing gasket.

In the bathtub drainer, the tail pipe is sleeved with a decorative cover which can slide on the tail pipe. The decorating cover can cover the connection between the tail pipe and the drainage pipeline, so that the connection between the tail pipe and the drainage pipeline is attractive.

Compared with the prior art, the utility model has the advantages of it is following:

the first connecting pipe and the second connecting pipe are made of copper materials, a fixing groove is formed in the front straight pipe section of the first connecting pipe, a sealing ring is fixed in the fixing groove, the second connecting pipe is inserted into the first connecting pipe, the sealing ring is elastically attached to the outer side face of the second connecting pipe, a convex shoulder capable of being abutted to the front end face of the first connecting pipe is arranged on the outer side face of the second connecting pipe, time and labor are saved during fixing and length adjusting operation between the first connecting pipe and the second connecting pipe, and time and labor are saved during installation and operation of the bathtub drainer during field. The tail pipe is fixed through the loose joint nut, so that the tail pipe is convenient to mount.

Drawings

FIG. 1 is a front elevational view of the present bathtub drain;

FIG. 2 is an exploded view of the present bathtub drain;

FIG. 3 is a schematic cross-sectional view of the connection between the first and second connecting pipes in the drain of the bathtub;

FIG. 4 is a schematic cross-sectional view of the union nut of the present bathtub drain.

In the figure, 1, a water body; 1a, an upper water inlet end; 1b, a side water inlet end; 1c, discharging a water outlet end; 2. an overflow body; 3. a first connecting pipe; 3a, a rear straight pipe section; 3b, a front straight pipe section; 3b1, fixing groove; 3c, corrugated pipe sections; 4. a second connecting pipe; 4a, rounding; 4b, a shoulder; 5. a long screw; 6. a launching flange; 7. a plug cover; 8. a drain gasket; 9. a back nut; 10. a rear seal ring; 11. a tail pipe; 11a, a blocking protrusion; 12. a loose joint screw cap; 12a, a convex ring; 13. a sealing collar; 13a, a blocking edge; 14. a gasket; 15. a decorative cover; 16. an overflow flange; 17. a foam gasket; 18. an overflow gasket; 19. a front nut; 20. a front seal ring; 21. a seal ring; 22. a gap.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 to 4, a bathtub drainer includes a drainer body 1 and an overflow body 2, wherein a first connecting pipe 3 is fixedly connected to the drainer body 1, a second connecting pipe 4 is fixedly connected to the overflow body 2, and the rear end of the second connecting pipe 4 is inserted into the front end of the first connecting pipe 3 to form a seal. The first connecting pipe 3 and the second connecting pipe 4 are both made of copper materials, and can be made of red copper or brass. The first connecting pipe 3 comprises a rear straight pipe section 3a connected with the lower water body 1, a front straight pipe section 3b connected with the second connecting pipe 4 and a corrugated pipe section 3c positioned between the rear straight pipe section 3a and the front straight pipe section 3 b.

The launching body 1 comprises an upper water inlet end 1a, a side water inlet end 1b and a lower water outlet end 1c, an upper water inlet channel is arranged in the upper water inlet end 1a, a side water inlet channel is arranged in the side water inlet end 1b, a lower water outlet channel is arranged in the lower water outlet end 1c, and the upper water inlet channel, the side water inlet channel and the lower water outlet channel are communicated with each other. A lower water installation seat is arranged in an upper water inlet channel of the upper water inlet end 1a, a lower water flange 6 is connected to the upper water inlet end 1a through a long screw 5, and a plug cover 7 capable of being taken out upwards is installed in the lower water flange 6. The long screw 5 penetrates through the lower water flange 6 and then is in threaded connection with the lower water installation seat, and a lower water sealing gasket 8 is arranged between the lower water flange 6 and the end face of the upper water inlet end 1 a. During the equipment, the diapire of bathtub is located between lower water flange 6 and the end 1a of intaking, sets up the diapire thickness of adaptation bathtub that long screw 5 can be better. The side water inlet end 1b is fixedly connected with the rear straight pipe section 3a of the first connecting pipe 3 through a rear nut 9, the rear nut 9 is sleeved on and in threaded connection with the side water inlet end 1b, a convex front convex ring is arranged on the inner side face of the front end of the rear nut 9, a rear sealing ring 10 is fixed between the front convex ring and the end face of the side water inlet end 1b, and the outer side of the rear sealing ring 10 is conical. During assembly, the rear straight pipe section 3a is inserted from the front end of the rear nut 9, passes through the rear sealing ring 10 and is inserted into the side water inlet channel of the side water inlet end 1b, then the rear nut 9 is screwed to enable the front convex ring to be pressed on the rear sealing ring 10, the rear sealing ring 10 is deformed under pressure, and the rear straight pipe section 3a is hooped by the rear sealing ring 10, so that the first connecting pipe 3 is fixedly connected to the sewer body 1. The lower water outlet end 1c is fixedly connected with a tail pipe 11, the tail pipe 11 is sleeved with a loose joint nut 12, the inner side surface of the lower end of the loose joint nut 12 is provided with a convex ring 12a, the outer side surface of the upper end of the tail pipe 11 is provided with a baffle protrusion 11a, the upper end of the loose joint nut 12 is sleeved on the lower water outlet end 1c and forms threaded connection, and the convex ring 12a is positioned below the baffle protrusion 11a and abuts against the baffle protrusion 11 a. A sealing collar 13 made of plastic, such as PP or PE, is inserted in the upper end of the tail tube 11. The upper end edge of the sealing ring 13 is turned outwards to form a blocking edge 13a, the blocking edge 13a abuts against the upper end face of the blocking protrusion 11a, and a sealing gasket 14 made of rubber materials is clamped and fixed between the blocking edge 13a and the end face of the lower water outlet end 1 c. During assembly, the loose joint screw cap 12 is sleeved into the tail pipe 11 from the lower end of the tail pipe 11, the convex ring 12a is positioned below the blocking protrusion 11a, then the sealing ring 13 is inserted into the upper end of the tail pipe 11, the blocking edge 13a of the sealing ring 13 is abutted against the upper end surface of the blocking protrusion 11a, the sealing pad 14 is placed on the upper end surface of the blocking edge 13a, the upper end of the tail pipe 11 is abutted with the lower water outlet end 1c of the lower water body, the upper end of the loose joint screw cap 12 is sleeved on the lower water outlet end 1c to form threaded connection, after the loose joint screw cap 12 is screwed down, the tail pipe 11 is fixedly connected to the lower water body 1, and the sealing pad 14 is positioned between the end surface of the lower water outlet end 1c and the blocking edge 13a of the sealing ring 13 to form sealing. The sealing property between the tail pipe 11 and the lower water outlet end 1c is improved by arranging a sealing collar 13 and a sealing gasket 14. The tail pipe 11 is externally fitted with a decorative cover 15 capable of sliding on the tail pipe 11.

An overflow flange 16 is connected to the front end of the overflow body 2 through a long screw 5, an overflow mounting seat is arranged in the overflow body 2, the long screw 5 penetrates through the overflow flange 16 and then is in threaded connection with the overflow mounting seat, and a foam gasket 17 and an overflow gasket 18 are arranged between the overflow flange 16 and the overflow mounting seat. When the bathtub is assembled, the side wall of the bathtub is positioned between the overflow flange 16 and the overflow body 2, and the long screws 5 are arranged to better adapt to the thickness of the side wall of the bathtub. The rear end of the overflow body 2 is fixedly connected with the front end of the second connecting pipe 4 through a front nut 19, the front nut 19 is sleeved and in threaded connection with the rear end of the overflow body 2, a convex rear convex ring is arranged on the inner side face of the rear end of the front nut 19, a front sealing ring 20 is fixed between the rear convex ring and the rear end face of the overflow body 2, and the outer side face of the front sealing ring 20 is conical. When the water overflow device is assembled, the front end of the second connecting pipe 4 is inserted from the rear end of the front screw cap 19, passes through the front sealing ring 20 and is inserted into the rear end of the water overflow body 2, then the front screw cap 19 is screwed down to press the rear convex ring in the front sealing ring 20, the front sealing ring 20 is deformed under pressure, and the front sealing ring 20 hoops the front end of the second connecting pipe 4, so that the second connecting pipe 4 is fixedly connected to the water overflow body 2.

An annular fixing groove 3b1 is formed in the inner side surface of the front end of the front straight pipe section 3b, and a sealing ring 21 made of a rubber material, such as silicon rubber or nitrile rubber, is fixed in the fixing groove 3b 1. The inner side part of the sealing ring 21 protrudes out of the fixing groove 3b1, the rear end of the connecting pipe II 4 is inserted into the front straight pipe section 3b, and the inner side surface of the sealing ring 21 is elastically attached to the outer side surface of the connecting pipe II 4. A rounding 4a or a chamfer is arranged between the rear end surface and the outer side surface of the second connecting pipe 4. A gap 22 is formed between the outer side face of the rear end of the second connecting pipe 4 and the inner side face of the front straight pipe section 3b, and the second connecting pipe 4 can slide in the first connecting pipe 3 under the action of external force. The outer side face of the front end of the second connecting pipe 4 is provided with a convex shoulder 4b, the convex shoulder 4b can abut against the front end face of the first connecting pipe 3, and the convex shoulder 4b has a limiting function and prevents the second connecting pipe 4 from falling into the first connecting pipe 3. When assembling, the sealing ring 21 is installed and fixed in the fixing groove 3b1, and then the rear end of the connecting pipe II 4 is inserted into the front straight pipe section 3b, so that the inner side surface of the sealing ring 21 is elastically pressed on the outer side surface of the connecting pipe II 4 to form sealing. When external force is not applied, the friction force between the sealing ring 21 and the second connecting pipe 4 can generally fix the second connecting pipe 4 in the first connecting pipe 3, and even if the friction force between the sealing ring 21 and the second connecting pipe 4 is insufficient or the second connecting pipe 4 is applied by the external force, the second connecting pipe 4 slides into the first connecting pipe 3, the second connecting pipe 4 can be prevented from falling into the first connecting pipe 3 completely through the limiting function of the shoulder 4 b.

When the bathtub drainer is assembled in a bathtub, the drainer body 1 and the drain flange 6 are fixed on the bottom wall of the bathtub, and the overflow body 2 and the overflow flange 16 are fixed on the side wall of the bathtub; then assembling a first connecting pipe 3 and a second connecting pipe 4, fixing the sealing ring 21 in the fixing groove 3b1, inserting the rear end of the second connecting pipe 4 into the front straight pipe section 3b of the first connecting pipe 3, and elastically attaching the inner side surface of the sealing ring 21 to the outer side surface of the second connecting pipe 4; then bending the corrugated pipe section 3c to enable the front straight pipe section 3b and the rear straight pipe section 3a to form a certain included angle, and erecting the first connecting pipe 3 to enable the front straight pipe section 3b to face upwards; the rear straight pipe section 3a is connected with the lower water body 1 through the rear screw cap 9, then the connecting pipe two 4 is partially drawn out from the front straight pipe section 3b so that the front end of the connecting pipe two 4 is inserted into the rear end of the overflow body 2, and the front screw cap 19 is screwed down so that the connecting pipe one 3 and the overflow body 2 are fixed.

The first connecting pipe 3 is made of a copper material, so that the first connecting pipe 3 has certain structural strength, after the corrugated pipe section 3c is bent and deformed, the first connecting pipe 3 can keep a bending deformation state, the front straight pipe section 3b cannot collapse downwards after being erected, meanwhile, the second connecting pipe 4 is also made of the copper material, and the second connecting pipe 4 also has certain structural strength, so that the first connecting pipe 3 and the second connecting pipe 4 can keep a fixed state only through splicing, the sealing ring 21 is kept in a sealing state, and the drainer has good sealing performance and use stability.

The sealing ring 21 is fixed in the fixing groove 3b1, the inner side surface of the sealing ring 21 is directly attached to the second connecting pipe 4 in an elastic manner, a convex shoulder 4b is arranged on the outer side surface of the second connecting pipe 4, in the field construction and installation process, only the second connecting pipe 4 needs to be inserted into the first connecting pipe 3, on one hand, friction force formed between the sealing ring 21 and the second connecting pipe 4 is utilized, and the first connecting pipe 3 and the second connecting pipe 4 are kept fixed by the structural strength of the first connecting pipe 3 and the second connecting pipe 4, on the other hand, the second connecting pipe 4 can be prevented from falling into the second connecting pipe 4 under the action of external force by the limiting effect of the convex shoulder 4b, and the second connecting pipe 4 can be rapidly and smoothly drawn out from the first. Therefore compare with current bathtub hydrophone down, this bathtub hydrophone down does not need to make the sealing washer 21 cramp two 4 assurance connecting pipes two 4 fixed through screwing up the nut when the field construction of bathtub, also need not to unscrew the nut and make and can adjust length between connecting pipe one 3 and the connecting pipe two 4 to make this bathtub hydrophone down installation operation labour saving and time saving, convenient operation when the field construction of bathtub.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a bathtub hydrophone down, includes water ontology (1) and overflow body (2), fixedly connected with connecting pipe (3) on water ontology (1), fixedly connected with connecting pipe two (4) on overflow body (2), its characterized in that, connecting pipe one (3) and connecting pipe two (4) are made by the copper product, connecting pipe one (3) include the back straight tube section (3a) of being connected with water ontology (1), the preceding straight tube section (3b) of being connected with connecting pipe two (4) and lie in ripple pipeline section (3c) between back straight tube section (3a) and preceding straight tube section (3b), be provided with on the medial surface of preceding straight tube section (3b) front end and be annular fixed slot (3b1), be fixed with sealing washer (21) of being made by rubber material in (3b1), the back end of connecting pipe two (4) is inserted in preceding straight tube section (3b) and the medial surface elasticity of sealing washer (21) is hugged closely and is even in even straight tube section (3b) is even And a convex shoulder (4b) is arranged on the outer side surface of the second connecting pipe (4) and the outer side surface of the front end of the second connecting pipe (4), and the convex shoulder (4b) can be abutted against the front end surface of the first connecting pipe (3).

2. A bathtub drain as defined in claim 1, characterised in that a rounding (4a) or a chamfer is provided between the rear end face and the outer side face of the second connecting tube (4).

3. A bathtub downcomer according to claim 1, characterised in that a gap (22) is provided between the outer side of the rear end of the second connecting pipe (4) and the inner side of the front straight pipe section (3 b).

4. A bathtub sewer according to any of the claims 1-3, characterized in that said sewer body (1) comprises an upper water inlet end (1a), a side water inlet end (1b) and a lower water outlet end (1c), the side water inlet end (1b) is fixedly connected with the rear straight pipe section (3a) of the connecting pipe I (3), a tail pipe (11) is fixedly connected to the lower water outlet end (1c), a loose joint nut (12) is sleeved on the tail pipe (11), a convex ring (12a) is arranged on the inner side surface of the lower end of the loose joint screw cap (12), a baffle protrusion (11a) is arranged on the outer side surface of the upper end of the tail pipe (11), the upper end of the loose joint screw cap (12) is sleeved on the lower water outlet end (1c) and forms threaded connection, the convex ring (12a) is positioned below the blocking protrusion (11a) and abuts against the blocking protrusion (11 a).

5. A bathtub sewer according to claim 4, characterized in that a sealing collar (13) made of plastic is inserted into the upper end of the tail pipe (11), the upper end edge of the sealing collar (13) is folded outwards to form a retaining edge (13a), the retaining edge (13a) abuts against the upper end surface of the retaining protrusion (11a), and a sealing gasket (14) made of rubber material is clamped and fixed between the retaining edge (13a) and the end surface of the lower water outlet end (1 c).

6. A bathtub drain as defined in claim 4, characterised in that said tailpipe (11) is sheathed with a decorative cover (15) which can slide over the tailpipe (11).