A water drain

Abstract

The present invention provides a drain, belonging to the technical field of sanitary ware. It solves the problem that the inner liner of the existing drain is not smoothly plugged in and out and has poor sealing stability after being connected to the washbasin. The drain comprises an outer cylinder and an inner liner pluggably connected to one end of the outer cylinder, the outer cylinder is also sleeved with an upper sealing gasket, a lower sealing gasket and a handwheel in sequence, the handwheel is threadedly connected to the outer cylinder, an annular positioning groove is provided on the outer side of the inner liner, a sealing sleeve is sleeved in the positioning groove, the thickness of the sealing sleeve is slightly smaller than the depth of the positioning groove, a sealing portion protruding out of the positioning groove is provided on the sealing sleeve along the circumferential direction, the sealing portion is inclined and the sealing portion abuts against the inner side surface of the outer cylinder to form a seal, a plurality of evenly distributed latches are provided on the top surface of the handwheel, and when the handwheel moves upward, the lower sealing gasket can be pushed and the latches are embedded in the lower sealing gasket, and a clamping portion for tool clamping is also provided on the outer side of the handwheel. The drain has the advantage of making the inner liner smoother during the pulling and drawing process.

Description

Technical Field

[0001] The invention belongs to the technical field of sanitary ware and relates to a drain. Background Art

[0002] A drain is a drainage device placed in a bathtub, basin, sink, sewer, etc. It can be divided into a bouncing drain, a flip drain, and a pull-up drain by type, and can be divided into a full copper drain, a stainless steel drain, a plastic drain, etc. by material. A drain usually has a drain body, and the upper and lower ends of the drain body are respectively provided with a water inlet and a water outlet. The water inlet is provided with an inner tank, i.e., a water sealing component. The outer wall of the drain body is provided with an external thread, and the outer wall is provided with two symmetrical seals and a handwheel that can be turned to press the seal through the thread. During assembly, the upper end of the drain body is sleeved on the installation port of a drainage device such as a basin, sealed with the installation port by a seal, and locked by a locking nut.

[0003] The main body of the traditional drain is a straight pipe with a fixed length. However, in actual installation, due to the difference in the environment of the drainage device, such as the bathroom basin drainage device, the bathroom basin is usually connected to a bathroom cabinet, and the height of the bathroom cabinet is set differently. The length of the drain body is often too long or too short, which brings great inconvenience to the installation and affects the practical performance. In addition, since the thickness values ​​of the installation ports of different drainage devices are different, in order to facilitate the installation of different installation ports, the seal has two groups, the lower group is an adjustable structure, and the external thread of the drain body is also extended in length, which is conducive to the corresponding adjustable locking of the hand wheel. Since the hand wheel and the drain body are connected by threads and pressed on the seal, it is easy to loosen the thread with the continuous use of the hand wheel, resulting in the weakening of the locking force acting on the two seals, and the sealing between the seal and the basin will be affected. In addition, the existing drain is pluggable between the inner liner and the drain body, and a sealing ring for sealing is set between the two. Generally, a ring groove is opened on the outer surface of the inner liner, and then an O-ring is set in the ring groove. In this way, when the inner liner is inserted into the drain body, the O-ring will be squeezed by the drain body and the inner liner to seal the two. However, since the gap between the drain body and the inner liner is too small, the friction between the O-ring and the inner side of the drain body is large, which makes it difficult to remove the inner liner after insertion or it is not pulled out smoothly, affecting the use of our users. Therefore, solving the above problems is an urgent matter to be dealt with. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and propose a drainer, which solves the technical problems that the inner tank of the prior drainer is not smoothly plugged in and out and the sealing stability is poor after being connected to the washbasin.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A water drainer comprises an outer cylinder and an inner shell which is pluggable and connected to one end of the outer cylinder, wherein an upper sealing gasket, a lower sealing gasket and a hand wheel are sequentially sleeved on the outer cylinder, the hand wheel is threadedly connected to the outer cylinder, an annular positioning groove is provided on the outer side of the inner shell, and the characteristic is that a sealing sleeve is sleeved in the positioning groove, the thickness of the sealing sleeve is slightly smaller than the depth of the positioning groove, a sealing portion protruding out of the positioning groove is provided on the sealing sleeve along the circumferential direction, the sealing portion is inclined and abuts against the inner side surface of the outer cylinder to form a seal, a plurality of evenly distributed latch teeth are provided on the top surface of the hand wheel, and when the hand wheel moves upward, the lower sealing gasket can be pushed and the latch teeth are embedded in the lower sealing gasket, and a clamping portion for clamping a tool is also provided on the outer side of the hand wheel.

[0007] The outer tube and the inner liner are pluggably connected to one end of the outer tube, and there is a certain gap between the outer tube and the inner liner. An annular positioning groove is also provided on the outer peripheral surface of the inner liner, and a flat sealing sleeve is provided in the positioning groove. The thickness of the sealing sleeve is slightly smaller than the depth of the positioning groove. The sealing sleeve is provided with a sealing portion protruding outside the positioning groove. The sealing portion is inclined and the sealing portion abuts against the inner side surface of the outer tube to form a seal. The sealing sleeve is flat and its maximum diameter is smaller than the diameter at the notch of the annular groove, that is, the sealing sleeve is completely located in the annular groove without contacting the inner side surface of the outer tube. The groove walls on both sides of the positioning groove can well limit the sealing sleeve to prevent it from sliding out of the positioning groove driven by the sealing portion during the plugging and unplugging of the inner liner. The wider sealing sleeve is also relatively stable when set in the positioning groove.

[0008] The sealing part is inclined and abuts against the inner side of the outer tube to form a seal. When the sealing part is squeezed by the outer tube, it can bend toward the sealing sleeve. The part with the maximum outer diameter of the sealing part contacts the inner side of the outer tube. This arrangement can effectively reduce the contact area between the sealing part and the inner side of the outer tube, thereby reducing the friction resistance between the two and making the inner liner smoother during the pulling and pulling process. In addition, since the gap between the inner liner and the outer tube is small, when the inner liner is inserted into the outer tube, the sealing part can reduce the friction between the outer tube by bending close to the sealing sleeve, making the inner liner smoother during the plugging and unplugging process. In addition, the inclination direction of the sealing part is consistent with the insertion direction of the inner liner, which has a certain guiding effect, further improving the smoothness of plugging and unplugging the inner liner.

[0009] The top surface of the hand wheel is provided with a plurality of evenly distributed latch teeth, and the latch teeth can be rotated by the hand wheel to press the lower sealing gasket and embed therein. The hand wheel is threadedly connected to the outer cylinder, and the latch teeth are located on the top surface of the hand wheel, so when the hand wheel is screwed, the latch teeth will contact with the lower sealing gasket and press against the lower end of the lower sealing gasket. In addition, since the lower sealing gasket is made of rubber or other elastic materials, when the latch teeth press against the lower sealing gasket, continuing to screw the hand wheel will cause the latch teeth to embed into the lower sealing gasket to form a limit, thereby preventing the hand wheel from loosening during use of the drain and causing the force of pressing the lower sealing gasket to weaken, thereby improving the stability of the seal between the drain and the washbasin. The outside of the handwheel is also provided with a clamping portion for clamping tools. In order to press the teeth against and embed them into the lower sealing gasket, the handwheel needs to be turned with great force, which is often impossible to achieve by directly twisting it with the hands. Therefore, by providing a clamping portion and using a wrench or other tool to clamp the clamping portion to twist the handwheel, the teeth can be better embedded in the lower sealing gasket for locking, thereby further improving the stability of the drainer after being connected to the washbasin.

[0010] In the above-mentioned drainer, the thickness of the sealing portion gradually decreases from one end close to the sealing sleeve to the other end.

[0011] Because the outer edge of the sealing part contacts the inner side surface of the outer tube, the thickness of the sealing part gradually decreases from one end close to the sealing sleeve to the other end. The advantage of this arrangement is that the wall thickness of the outer edge of the sealing part is reduced, making it easier to deform and bend, thereby reducing the friction between the outer tube and further facilitating the insertion and removal of the inner liner.

[0012] In the above-mentioned water drainer, the hand wheel includes a pressure head, a locking section and a hand holding head in sequence, the locking teeth are located on the top surface of the pressure head, the clamping part is located on the outer peripheral surface of the locking section, and the inner side of the locking section is also provided with an internal thread for connecting with the outer cylinder thread.

[0013] The handwheel is composed of three parts: a top pressure head, a locking section and a handheld head, and the three parts are formed in one piece. The function of the top pressure head is to contact and abut against the lower sealing gasket. The latch teeth on its top surface can be embedded in the lower sealing gasket and clamped to effectively prevent loosening, thereby improving the sealing stability of the water drainer. The specific function of the locking section is that it has an internal thread. The entire handwheel is connected to the outside of the outer cylinder through the internal thread of the locking section. The clamping part is also located on the outer circumferential surface of the locking section. The locking section is adjacent to the top pressure head. In this way, using a tool to twist the locking section can better embed the latch teeth on the top pressure head into the lower sealing gasket. The handheld head is used for us to turn the handwheel by hand. When we do not have tools or have not turned the handwheel to press on the lower sealing gasket, we can install the water drainer by turning the handheld head by hand, which is more convenient to use.

[0014] In the above-mentioned drain, the outer contour of the clamping portion is in the shape of an outer hexagon or an outer octagon.

[0015] The shape of the clamping part is similar to the outer contour of the nut, which is an external hexagonal or octagonal shape, and has multiple sets of parallel sections. The two parallel sections can be clamped by clamping tools such as wrenches. This structure is simple, convenient and practical.

[0016] In the above-mentioned water drainer, the latch tooth includes a forward tooth surface and a reverse tooth surface, the reverse tooth surface is perpendicular to the bottom surface of the lower sealing gasket, the forward tooth surface intersects with the bottom surface of the lower sealing gasket at an acute angle, and the inclination direction of the forward tooth surface is opposite to the twisting direction when the locking section rotates close to the lower sealing gasket.

[0017] The direction of our thread twisting is opposite to the direction of the forward tooth surface. In this way, due to the existence of the forward tooth surface, we can easily embed the latch tooth into the lower sealing gasket. After embedding, since the reverse tooth surface is perpendicular to the bottom surface of the sealing gasket, the existence of the reverse tooth surface makes it difficult for the handwheel to have reverse thread loosening. Especially when the latch tooth is embedded in the lower sealing gasket, the existence of the reverse tooth surface can better grip the lower sealing gasket so that the handwheel will not have thread loosening, further improving the stability of the seal between the drainer and the washbasin.

[0018] In the above-mentioned drainer, a plurality of evenly distributed and long ribs are also provided on the outer side of the handheld head.

[0019] When we hold and turn the handheld head, the ribs can effectively increase the friction between our hands, making it easier for us to turn the handwheel and apply force.

[0020] In the above-mentioned drainer, an annular groove is provided in the outer cylinder at one side of the inner tank, and the outer edge of the sealing portion abuts against the bottom of the annular groove.

[0021] The setting of the annular groove further increases the gap between the inner liner and the inner liner, further reducing the squeezing force exerted on the inner liner when in contact with the sealing part, making the inner liner smoother during the insertion and removal process.

[0022] In the above-mentioned drain, a convex rib with an annular protrusion is provided at the lower end of the upper sealing gasket.

[0023] The convex ribs are provided to improve the sealing effect between the upper sealing gasket and the washbasin.

[0024] Compared with the existing technology, the advantages of this product are:

[0025] 1. The part with the maximum outer diameter of the sealing part in contact with the inner side of the outer tube is such a setting that the contact area between the sealing part and the inner side of the outer tube can be effectively reduced, thereby reducing the friction resistance between the two and making the inner liner smoother during the pulling process.

[0026] 2. When the inner liner is inserted into the outer tube, the sealing part can reduce the friction between the outer tube by bending close to the sealing sleeve, making the inner liner smoother during the insertion and removal process. In addition, the inclination direction of the sealing part is consistent with the insertion direction of the inner liner, which has a certain guiding effect, further improving the smoothness of the insertion and removal of the inner liner.

[0027] 3. The handwheel is threadedly connected to the outer cylinder, and the latch teeth are located on the top surface of the handwheel, so the latch teeth will contact with the lower sealing gasket and press on the lower end of the lower sealing gasket by twisting the handwheel through the thread. Continuing to twist the handwheel will cause the latch teeth to embed into the lower sealing gasket to form a limit, preventing the handwheel from loosening during use of the drain and causing the force of pressing the lower sealing gasket to weaken, thereby improving the stability of the seal between the drain and the washbasin. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a half-section schematic diagram of a part of the structure of the present invention;

[0030] Figure 3 It is a partial enlarged schematic diagram of A of the present invention;

[0031] Figure 4 It is a parts diagram of the hand wheel of the present invention;

[0032] Figure 5 It is a parts diagram of the sealing sleeve of the present invention;

[0033] Figure 6 is a half-section schematic diagram of the sealing sleeve of the present invention;

[0034] Figure 7 1 is a side view of an upper gasket of the present invention.

[0035] In the figure, 1, outer cylinder; 11, ring groove; 2, inner liner; 21, positioning groove; 3, upper sealing gasket; 31, convex rib; 4, lower sealing gasket; 5, hand wheel; 51, top pressure head; 52, locking section; 53, hand holding head; 54, latching teeth; 541, forward tooth surface; 542, reverse tooth surface; 55, clamping part; 551, cut surface; 56, internal thread; 57, rib; 6, sealing sleeve; 61, sealing part. DETAILED DESCRIPTION

[0036] 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.

[0037] Embodiment 1

[0038] like Figure 1-Figure 2The water drainer shown comprises an outer tube 1 and an inner liner 2 which is pluggable and connected to one end of the outer tube 1. The outer tube 1 is annular and has a convex edge at the upper end. The middle part of the outer tube 1 has a long external thread section. The inner liner 2 comprises a cylindrical shell and a sealing core which is clamped in the upper port of the shell. The upper end of the shell is also provided with a retaining edge which abuts against the convex edge. The lower end of the shell is inserted from one end of the retaining edge of the outer tube 1 and the retaining edge on the shell abuts against the convex edge. The outer tube 1 is sequentially sleeved with an upper sealing gasket 3, a lower sealing gasket 4 and a hand wheel 5 from one end of the convex edge toward the other end. When the water drainer is used, the upper sealing gasket 3 is first sleeved on the outer tube 1 and one end of the upper sealing gasket 3 is limited by the convex edge. Then the outer tube 1 is inserted from the drain outlet of the washbasin and then the lower sealing gasket 4 and the hand wheel 5 are sleeved from the bottom of the washbasin. The upper sealing gasket 3 can seal the upper port of the drain outlet of the washbasin, and the lower sealing gasket 4 can seal the lower sealing port of the drain outlet of the washbasin. The lower end of the upper sealing gasket 3 is provided with a convex rib 31 in the form of an annular protrusion. The setting of the convex rib 31 can improve the sealing effect between the upper sealing gasket 3 and the washbasin. The handwheel 5 is threadedly connected to the outer cylinder 1 and presses the lower sealing gasket 4 toward the upper sealing gasket 3 by rotating the thread. The top surface of the handwheel 5 is provided with a circle of evenly distributed latch teeth 54, and the latch teeth 54 can press the lower sealing gasket 4 and embed into it by rotating the handwheel 5. The handwheel 5 is threadedly connected to the outer cylinder 1, and the latch teeth 54 are located on the top surface of the handwheel 5, so the latch teeth 54 will contact the lower sealing gasket 4 and press on the lower end of the lower sealing gasket 4 by screwing the handwheel 5. Since the lower sealing gasket 4 is made of rubber, when the latch teeth 54 press on the lower sealing gasket 4, continuing to turn the hand wheel 5 will cause the latch teeth 54 to embed into the lower sealing gasket 4 to form a limit, preventing the hand wheel 5 from loosening during use of the drain and causing the force pressing on the lower sealing gasket 4 to weaken, thereby improving the stability of the seal between the drain and the washbasin.

[0039] like Figure 2-Figure 4As shown, the hand wheel 5 includes a top pressure head 51, a locking section 52 and a hand-held head 53, a latch 54 is located on the top surface of the top pressure head 51, a clamping portion 55 is located on the outer peripheral surface of the locking section 52, and the inner side of the locking section 52 is also provided with an internal thread 56 for threaded connection with the outer cylinder 1. The hand wheel 5 is composed of the top pressure head 51, the locking section 52 and the hand-held head 53, and the three parts are integrally formed. The function of the top pressure head 51 is to contact and abut against the lower sealing gasket 4, and the latch 54 on the top surface can be embedded in the lower sealing gasket 4 and the claw can effectively prevent loosening, thereby improving the sealing stability of the water discharger. The specific function of the locking section 52 is that it has an internal thread 56. The entire hand wheel 5 is threadedly connected to the outside of the outer tube 1 through the internal thread 56 of the locking section 52. The clamping portion 55 is also located on the outer peripheral surface of the locking section 52. The locking section 52 is adjacent to the top pressure head 51. In this way, the locking section 52 can be twisted with a tool to better embed the latch 54 on the top pressure head 51 into the lower sealing gasket 4. The hand-held head 53 is used for us to rotate the hand wheel 5 by hand. When we do not have a tool or have not yet rotated the hand wheel 5 to press on the lower sealing gasket 4, we can install the water discharger by rotating the hand-held head 53 by hand, which is more convenient to use. The latch 54 includes a forward tooth surface 541 and a reverse tooth surface 542. The reverse tooth surface 542 is perpendicular to the bottom surface of the lower sealing gasket 4. The forward tooth surface 541 intersects with the bottom surface of the lower sealing gasket 4 at an acute angle. The inclination direction of the forward tooth surface 541 is opposite to the twisting direction when the locking section 52 rotates close to the lower sealing gasket 4. The direction of threading is the same as that of the forward tooth surface 541. Due to the presence of the forward tooth surface 541, we can easily embed the latch 54 into the lower sealing gasket 4. After embedding, the reverse tooth surface 542 is perpendicular to the bottom surface of the lower sealing gasket 4. The reverse tooth surface 542 makes it difficult for the hand wheel 5 to loosen the reverse thread. In particular, when the latch 54 is embedded in the lower sealing gasket 4, the reverse tooth surface 542 can better grip the lower sealing gasket 4 so that the hand wheel 5 will not loosen the thread, further improving the sealing stability between the drain and the wash basin. The outer side of the handheld head 53 is also provided with a number of evenly distributed and long strip-shaped ribs 57. When we hold and turn the handheld head 53, the ribs 57 can effectively increase the friction between our hands, making it easy for us to turn the hand wheel 5 and convenient for us to exert force.

[0040] like Figure 1-Figure 7As shown, an annular groove 11 is provided in the outer cylinder 1 on one side of the inner liner 2, and the outer edge of the sealing portion 61 abuts against the groove bottom of the annular groove 11. The setting of the annular groove 11 further increases the gap between the inner liner 2. An annular positioning groove 21 is also provided on the outer peripheral surface of the inner liner 2, and a flat sealing sleeve 6 is sleeved in the positioning groove 21. The thickness of the sealing sleeve 6 is slightly less than the depth of the positioning groove 21. The sealing sleeve 6 is provided with a sealing portion 61 protruding out of the positioning groove 21. The sealing portion 61 is inclined and abuts against the inner side surface of the outer cylinder 1 to form a seal. The sealing sleeve 6 is flat and its maximum diameter is smaller than the diameter of the notch of the annular groove 11, that is, the sealing sleeve 6 is completely located in the annular groove 11 without contacting the inner side surface of the outer cylinder 1. The groove walls on both sides of the positioning groove 21 can well limit the sealing sleeve 6 to prevent it from sliding out of the positioning groove 21 driven by the sealing portion 61 during the plugging and unplugging of the inner liner 2. The wider sealing sleeve 6 is also relatively stable when sleeved in the positioning groove 21. The thickness of the sealing portion 61 gradually decreases from one end close to the sealing sleeve 6 to the other end. Since the outer edge of the sealing portion 61 contacts the inner side of the outer tube 1, the thickness of the sealing portion 61 gradually decreases from one end close to the sealing sleeve 6 to the other end. The advantage of this arrangement is to reduce the wall thickness of the outer edge of the sealing portion 61, making it easier to deform and bend, thereby reducing the friction between the outer tube 1 and further facilitating the insertion and removal of the inner liner 2.

[0041] The sealing portion 61 is inclined and abuts against the inner side of the outer tube 1 to form a seal. When the sealing portion 61 is squeezed by the outer tube 1, it can bend toward the sealing sleeve 6. The sealing portion 61 is in contact with the inner side of the outer tube 1 at its maximum outer diameter. This arrangement can effectively reduce the contact area between the sealing portion 61 and the inner side of the outer tube 1, thereby reducing the friction resistance between the two and making the inner liner 2 smoother during the pulling and pulling process. Moreover, since the gap between the inner liner 2 and the outer tube 1 is small, when the inner liner 2 is inserted into the outer tube 1, the sealing portion 61 can reduce the friction between the outer tube 1 by bending close to the sealing sleeve 6, making the inner liner 2 smoother during the plugging and unplugging process. Moreover, the inclination direction of the sealing portion 61 is consistent with the insertion direction of the inner liner 2, which has a certain guiding effect, further improving the smoothness of the plugging and unplugging of the inner liner 2.

[0042] The outside of the hand wheel 5 is also provided with a clamping portion 55 for clamping tools. The outer contour of the clamping portion 55 is an outer octagonal shape, which can be clamped by tools such as a wrench, just like the outer contour of a nut. In order to press the latching teeth 54 against and embed them into the lower sealing gasket 4, it is necessary to twist the hand wheel 5 with a large force, which is often impossible to achieve by twisting directly by hand. Therefore, by setting the clamping portion 55 and using a tool such as a wrench to clamp the clamping portion 55 to twist the hand wheel 5, the latching teeth 54 can be better embedded in the lower sealing gasket 4 for locking, further improving the stability of the drainer after being connected to the washbasin. The shape of the clamping portion 55 is similar to the outer contour of the nut, and the structure is simple, convenient and practical.

[0043] Embodiment 2

[0044] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: a plurality of evenly distributed slots are provided on the top surface of the hand wheel in this embodiment, the depth of the slots gradually decreases, and the depth of each slot decreases in the same direction. This arrangement can achieve the same technical effect as the latching teeth.

[0045] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A drain, comprising an outer cylinder (1) and an inner liner (2) pluggably connected to one end of the outer cylinder (1), wherein the outer cylinder (1) is sleeved with an upper sealing gasket (3), a lower sealing gasket (4) and a hand wheel (5) in sequence, wherein the hand wheel (5) is threadedly connected to the outer cylinder (1), and an annular positioning groove (21) is provided on the outer side of the inner liner (2), characterized in that: A sealing sleeve (6) is provided inside the positioning groove (21). The thickness of the sealing sleeve (6) is slightly smaller than the depth of the positioning groove (21). A sealing portion (61) protruding from the positioning groove (21) is provided on the sealing sleeve (6) along the circumferential direction. The sealing portion (61) is arranged obliquely and abuts against the inner side surface of the outer cylinder (1) to form a seal. A plurality of evenly distributed latching teeth (54) are provided on the top surface of the hand wheel (5). When the hand wheel (5) moves upward, the lower sealing gasket (4) can be pushed and the latching teeth (54) can be embedded in the lower sealing gasket (4). A clamping portion (55) for clamping a tool is also provided on the outer side of the hand wheel (5). The thickness of the sealing portion (61) gradually decreases from one end close to the sealing sleeve (6) to the other end. The hand wheel (5) comprises a pressing head (51), a locking head (52), and a locking head (53). The locking section (52) and the hand-held head (53) are provided with a latching tooth (54) on the top surface of the pressing head (51); the clamping portion (55) is located on the outer peripheral surface of the locking section (52); the inner side of the locking section (52) is further provided with an internal thread (56) for threaded connection with the outer cylinder (1); the latching tooth (54) comprises a forward tooth surface (541) and a reverse tooth surface (542); the reverse tooth surface (542) is perpendicular to the bottom surface of the lower sealing gasket (4); the forward tooth surface (541) and the bottom surface of the lower sealing gasket (4) intersect at an acute angle; the inclination direction of the higher end (541) of the forward tooth surface is opposite to the twisting direction when the locking section (52) is rotated to approach the lower sealing gasket (4); an annular groove (11) is provided in the outer cylinder (1) on one side of the inner liner (2); the outer edge of the sealing portion (61) abuts against the bottom of the annular groove (11).

2. A drain according to claim 1, characterized in that: The outer contour of the clamping portion (55) is in an outer hexagonal or outer octagonal shape.

3. A drain according to claim 2, characterized in that: The outer side of the hand-held head (53) is also provided with a plurality of evenly distributed and elongated ribs (57).

4. A drain according to claim 3, characterized in that: The lower end of the upper sealing gasket (3) is provided with a convex rib (31) in the form of an annular protrusion.

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