CN213448718U

CN213448718U - Water draining device

Info

Publication number: CN213448718U
Application number: CN202022362670.1U
Authority: CN
Inventors: 吴小平
Original assignee: Yuhuan Anfina Sanitary Ware Factory
Current assignee: Yuhuan Anfina Sanitary Ware Factory
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-06-15
Anticipated expiration: 2030-10-22

Abstract

The utility model provides a drainer, belonging to the technical field of sanitary ware. The problem that the inner container of an existing drainer is not smoothly plugged and pulled out and is not good in sealing stability after being connected with a washbasin is solved. This drainer includes the urceolus and but plug connects in the inner bag of urceolus one end, still overlap in proper order on the urceolus and be equipped with sealed pad down, sealed pad and hand wheel, hand wheel and urceolus threaded connection, the inner bag outside is seted up and is annular constant head tank, the constant head tank endotheca is equipped with the seal cover, the thickness of seal cover slightly is less than the degree of depth of constant head tank, be equipped with the outer sealing of protrusion constant head tank along circumference on the seal cover, the sealing slope sets up and the sealing supports with the urceolus medial surface and leans on to form sealedly, the hand wheel top surface is equipped with a plurality of evenly distributed's latch, and can push away sealed pad down and make latch embedding sealed pad. The drainer has the advantage of ensuring the inner container to be smoother in the drawing process.

Description

Water draining device

Technical Field

The utility model belongs to the technical field of sanitary wares, a drainer is related to.

Background

The drainer is a drainage device arranged at a bathtub, a basin, a water tank, a sewer and the like, and can be divided into bounce drainage, flip drainage, lifting drainage and the like according to types, and can be divided into full-copper drainage, stainless steel drainage, plastic drainage and the like according to materials. The drainer generally comprises a drainer body, wherein the upper end and the lower end of the drainer body are respectively provided with a water inlet and a water outlet, the water inlet is provided with an inner container, namely a water sealing assembly, the outer side wall of the drainer body is provided with external threads, and the outer side wall is sleeved with two symmetrical sealing elements and a hand wheel capable of rotating through the threads to press the sealing elements. When the water drainer is assembled, the upper end of the water drainer main body is sleeved on a mounting opening of a water draining device such as a basin and the like, is sealed with the mounting opening through a sealing piece and is locked by a locking nut.

Its hydrophone main part of tradition hydrophone is a fixed straight pipe fitting of length, however in the actual installation because the difference of drainage device environment, for example bathroom basin drainage device, even be equipped with the bathroom cabinet under the end of bathroom basin usually, the height setting of bathroom cabinet differs, can appear the length overlength of hydrophone main part or short often, brings very big inconvenience for the installation, also influences practicality. Furthermore, because the thickness values of the mounting ports of different drainage devices are different, in order to be beneficial to being suitable for mounting of different mounting ports, the sealing element is provided with an upper group and a lower group, the lower group is of an up-down adjustable structure, and the external thread of the drainer main body is also arranged in a length extending mode, so that the hand wheel can be correspondingly locked in an up-down adjustable mode. Because the hand wheel is in threaded connection with the drainer main body and is pressed against the sealing element, the locking force acting on the two sealing elements is weakened due to the fact that the hand wheel is frequently used, and the tightness between the sealing element and the washbasin is affected. And the inner container of the existing drainer can be plugged into and pulled out of the drainer main body, and a sealing ring for sealing is arranged between the inner container and the drainer main body. Generally, an annular groove is formed in the outer peripheral surface of the inner container, and then the annular groove is sleeved with an O-shaped ring, so that when the inner container is inserted into the drainer main body, the O-shaped ring is extruded by the drainer main body and the inner container to seal the drainer main body and the inner container. However, as the gap between the drainer main body and the liner is too small, the friction force between the O-shaped ring and the inner side surface of the drainer main body is large, so that the liner is difficult to take out or not smooth to pull out after being inserted, and the use of users is affected. Therefore, the problem of solving the above existing problem is that the matters to be handled are not buffered at present.

Disclosure of Invention

The utility model aims at solving the problems in the prior art and providing a drainer. The water drainer solves the technical problems that the inner container of the existing water drainer is not smoothly plugged and pulled out and the sealing stability is poor after the inner container is connected with a washbasin.

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

the utility model provides a drainer, includes the urceolus and can connect in the inner bag of urceolus one end by plug, still overlap in proper order on the urceolus and be equipped with sealed pad, lower sealing pad and hand wheel, hand wheel and urceolus threaded connection, the annular constant head tank has been seted up in the inner bag outside, a serial communication port, the constant head tank endotheca is equipped with the seal cover, the thickness of seal cover slightly is less than the degree of depth of constant head tank, be equipped with the outer sealing of protrusion constant head tank along circumference on the seal cover, the sealing slope sets up and the sealing leans on with the urceolus medial surface to form sealedly, the hand wheel top surface is equipped with a plurality of evenly distributed's latch, and can push away when hand wheel rebound lower sealing pad and make latch embedding lower sealing pad.

The outer barrel and the inner container which can be inserted and pulled to be connected to one end of the outer barrel, and a certain gap is formed between the outer barrel and the inner container. Still be equipped with on the outer peripheral face of inner bag and be annular constant head tank, the constant head tank endotheca is equipped with the seal cover that is the platykurtic, and the thickness of seal cover slightly is less than the degree of depth of constant head tank, is equipped with the outside sealing of protrusion constant head tank on the seal cover, and the slope of sealing sets up and the sealing leans on with the urceolus medial surface to form sealedly. The seal cover is the platykurtic and its maximum diameter is less than the diameter of the notch department of annular promptly the seal cover is located the annular completely and does not contact with the urceolus medial surface, and outside the spacing seal cover that the both sides cell wall of constant head tank can be fine prevented to receive the drive roll-off constant head tank of sealing at the in-process of inner bag plug, the stability of the seal cover of broad in the constant head tank is also relatively better.

The sealing part is obliquely arranged and abuts against the inner side surface of the outer barrel to form sealing, and when the sealing part is extruded by the outer barrel, the sealing part can bend towards the direction of the sealing sleeve. The contact of the inner side surface of the outer barrel is the maximum outer diameter position of the sealing part, so that the contact area between the sealing part and the inner side surface of the outer barrel can be effectively reduced, the friction resistance between the sealing part and the inner side surface of the outer barrel is reduced, and the inner container is smooth in the drawing process. And because the clearance between inner bag and the urceolus is less, when the inner bag inserted in the urceolus, the sealing can be through the crooked seal cover of pressing close to realize reducing and the urceolus between frictional force for the inner bag is more smooth and easy at the plug in-process. And the inclination direction of the sealing part is consistent with the insertion direction of the liner, so that a certain guiding effect is achieved, and the smoothness of the insertion and the extraction of the liner is further improved.

The top surface of the hand wheel is provided with a plurality of clamping teeth which are uniformly distributed, and the clamping teeth can rotate through the hand wheel to jack the lower sealing gasket and be embedded into the lower sealing gasket. The hand wheel is in threaded connection with the outer barrel, and the latch is located on the top surface of the hand wheel, so that the latch of the hand wheel is screwed through threads to be in contact with the lower sealing gasket and is pressed against the lower end of the lower sealing gasket. And because the lower sealing gasket is made of rubber or other elastic materials, the latch is pressed against the lower sealing gasket, the hand wheel is continuously screwed when the latch is pressed against the lower sealing gasket, so that the latch is embedded into the lower sealing gasket to form spacing, the force weakening of pressing the lower sealing gasket due to looseness of the hand wheel in the use process of the drainer is prevented, and the sealing stability between the drainer and the washbasin is improved. The outside of hand wheel still is equipped with the clamping part that can supply the instrument centre gripping, and it is great that it needs to twist the hand wheel in wanting latch roof pressure and embedding lower seal pad, and it often can't realize directly twisting through the hand, so use tools such as spanner to grasp the clamping part through setting up the clamping part and twist the hand wheel and can make the better embedding of latch seal pad in lock, further improved this hydrophone and the stability after washbasin is connected.

In the drainer of the above kind, the thickness of the sealing portion gradually decreases from one end close to the sealing sleeve to the other end.

Because the outer edge of sealing part when contacting with the urceolus medial surface, the thickness of sealing part reduces from being close to seal cover one end to the other end gradually, and the benefit that sets up like this reduces the wall thickness on the outer edge of sealing part for it produces deformation bending more easily, thereby reduce and the urceolus between frictional force, further made things convenient for the plug of inner bag.

In foretell hydrophone down, the hand wheel includes in proper order and pushes up pressure head, locking section and handheld head, the latch is located the top surface of pushing up the pressure head, the clamping part is located the outer peripheral face of locking section, the inboard of locking section still be equipped with be used for with urceolus threaded connection's internal thread.

The hand wheel is composed of a top pressure head, a locking section and a handheld head, and the three are integrally formed. The effect of top pressure head is exactly used for supporting with the contact of lower sealing gasket and leans on, and the latch of its top surface can imbed in the lower sealing gasket and the claw is lived can effectually prevent not hard up, has improved this hydrophone's under sealing stability. The locking section has the specific effects that the whole hand wheel with the internal thread is connected outside the outer cylinder through the internal thread of the locking section, the clamping part is also positioned on the outer peripheral surface of the locking section, the locking section is adjacent to the jacking head, and therefore a tool is used for screwing the locking section to enable the clamping teeth on the jacking head to be well embedded into the lower sealing gasket. The handheld head is used for the bare-handed hand of us to rotate the hand wheel and uses, does not have the instrument when we or has not rotated the hand wheel to the top and presses on lower sealing gasket, can rotate handheld head through the bare-handed hand and realize this hydrophone of installation down, and it is comparatively convenient to use.

In the above-mentioned drainer, the outer contour of the clamping part is in a shape of an outer hexagon or an outer octagon.

The shape of clamping part is outer hexagonal or outer octagon shape like the outline of nut, has the tangent plane of two liang of parallels of multiunit, and two parallel tangent planes can supply clamping tool centre gripping such as spanner, set up simple structure convenient and practical like this.

In the drainer, the latch comprises a clockwise tooth surface and an anticlockwise tooth surface, the anticlockwise tooth surface is perpendicular to the bottom surface of the lower sealing gasket, the clockwise tooth surface is intersected with the bottom surface of the lower sealing gasket at an acute angle, and the inclination direction of the clockwise tooth surface is opposite to the screwing direction when the locking section rotates to be close to the lower sealing gasket.

The screwing directions of the threads are opposite along the tooth surfaces, so that the clamping teeth can be easily embedded into the lower sealing gasket due to the existence of the tooth surfaces, reverse thread looseness is not easy to occur on the hand wheel due to the existence of the reverse tooth surfaces which are vertical to the bottom surface of the sealing gasket after the clamping teeth are embedded into the lower sealing gasket, particularly, when the clamping teeth are embedded into the lower sealing gasket, the lower sealing gasket can be better clamped by the existence of the reverse tooth surfaces, so that thread looseness cannot occur on the hand wheel, and the sealing stability between the drainer and the washbasin is further improved.

In the drainer, the outer side of the handheld head is also provided with a plurality of uniformly distributed long-strip-shaped ribs.

When a user holds and rotates the hand-held head, the ribs can effectively increase friction force between the user and the hand, and the user can easily rotate the hand wheel to facilitate force application.

In the drainer, a ring groove is arranged on one side of the inner container in the outer cylinder, and the outer edge of the sealing part is abutted against the groove bottom of the ring groove.

The setting of annular has further increaseed and the inner bag between the clearance, and further reduction to its extrusion force that produces when contacting with sealing, make the inner bag comparatively smooth and easy at the plug in-process.

In the above drainer, the lower end of the upper sealing gasket is provided with a convex rib which is in an annular bulge.

The arrangement of the convex ribs plays a role in improving the sealing effect between the upper sealing gasket and the washbasin.

Compared with the prior art, the product has the advantages that:

1. the contact of the inner side surface of the outer barrel is the maximum outer diameter position of the sealing part, so that the contact area between the sealing part and the inner side surface of the outer barrel can be effectively reduced, the friction resistance between the sealing part and the inner side surface of the outer barrel is reduced, and the inner container is smooth in the drawing process.

2. When the inner bag inserted in the urceolus, the sealing can press close to the seal cover through the bending and realize reducing and the urceolus between frictional force for the inner bag is more smooth and easy at the plug in-process, and the sealing incline direction and the inner bag insert the unanimous certain guide effect that has of direction in addition, further promotes the smooth and easy degree of inner bag plug.

3. Hand wheel and urceolus threaded connection, the latch is located the top surface of hand wheel, so twist through the screw thread and move the hand wheel latch can with the lower seal pad contact and roof pressure at the lower seal pad lower extreme, continue to twist and move the hand wheel and can make the latch embedding lower seal pad form spacing, prevent that this hydrophone is not hard up in the use hand wheel and lead to the dynamics of roof pressure lower seal pad to weaken, thereby improved sealed stability between this hydrophone and the washbasin down.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of a half-section of the structure of the present invention;

fig. 3 is a partially enlarged schematic view of the utility model at a;

fig. 4 is a part view of the hand wheel of the present invention;

figure 5 is a detail view of the sealing sleeve of the present invention;

figure 6 is a schematic half-section of the sealing sleeve of the present invention;

fig. 7 is a side view of the upper seal gasket of the present invention.

In the figure, 1, an outer cylinder; 11. a ring groove; 2. an inner container; 21. positioning a groove; 3. an upper seal gasket; 31. a rib; 4. a lower seal gasket; 5. a hand wheel; 51. a pressing head is pressed; 52. a locking section; 53. holding the head by hand; 54. clamping teeth; 541. smoothing the tooth surface; 542. a reverse tooth flank; 55. a clamping portion; 551. cutting into noodles; 56. an internal thread; 57. a rib; 6. sealing sleeves; 61. and a sealing part.

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

The drainer shown in fig. 1-2 comprises an outer cylinder 1 and an inner container 2 which can be inserted into and pulled out of one end of the outer cylinder 1, wherein the outer cylinder 1 is in a ring pipe shape, the upper end of the outer cylinder is provided with a convex edge, and the middle part of the outer cylinder 1 is provided with a longer external thread section. The inner container 2 comprises a cylindrical shell and a sealing core clamped in an upper port of the shell. The upper end of the shell is also provided with a blocking edge abutted against the convex edge, the lower end of the shell is inserted from one end of the blocking edge of the outer barrel 1, and the blocking edge on the shell is abutted against the convex edge. The outer cylinder 1 is sequentially sleeved with an upper sealing gasket 3, a lower sealing gasket 4 and a hand wheel 5 from one end of a convex edge to the other end. When the water drainer is used, the upper sealing gasket 3 is sleeved on the outer barrel 1, one end of the upper sealing gasket 3 is limited by the convex edge, then the outer barrel 1 is inserted from a water outlet of a washbasin, and then the lower sealing gasket 4 and the hand wheel 5 are sleeved under the washbasin, the upper sealing gasket 3 can seal the upper port of the water outlet of the washbasin, and the lower sealing gasket 4 can seal the lower sealing port of the water outlet of the washbasin. The lower end of the upper sealing gasket 3 is provided with a convex rib 31 which is in an annular bulge. The arrangement of the convex rib 31 plays a role in enabling the sealing effect between the upper sealing gasket 3 and the washbasin to be achieved, namely, the lifting hand wheel 5 is in threaded connection with the outer barrel 1, and the pressing sealing gasket 4 is pushed to move towards the upper sealing gasket 3 through the rotation of threads. The top surface of the hand wheel 5 is provided with a circle of clamping teeth 54 which are uniformly distributed, and the clamping teeth 54 can push down the sealing gasket 4 and be embedded into the sealing gasket by rotating the hand wheel 5. The hand wheel 5 is in threaded connection with the outer cylinder 1, and the latch 54 is positioned on the top surface of the hand wheel 5, so that the latch 54 can be contacted with the lower sealing gasket 4 and pressed against the lower end of the lower sealing gasket 4 by screwing the hand wheel 5 through threads. And because the lower sealing gasket 4 is made of rubber, the latch 54 is pressed against the lower sealing gasket 4, the hand wheel 5 is continuously screwed to enable the latch 54 to be embedded into the lower sealing gasket 4 to form limit, and the force weakening of the pressing-down sealing gasket 4 caused by the looseness of the hand wheel 5 in the use process of the drainer is prevented, so that the sealing stability between the drainer and the washbasin is improved.

As shown in fig. 2 to 4, the hand wheel 5 includes a pushing head 51, a locking section 52 and a hand-held head 53, the latch 54 is located on the top surface of the pushing head 51, the holding portion 55 is located on the outer peripheral surface of the locking section 52, and the inner side of the locking section 52 is further provided with an internal thread 56 for screw-connecting with the outer cylinder 1. The hand wheel 5 is composed of a top pressure head 51, a locking section 52 and a handheld head 53, and the three are integrally formed. The function of top pressure head 51 is just used for supporting with the contact of lower sealing gasket 4, and the latch 54 of its top surface can imbed in lower sealing gasket 4 and the claw can effectually prevent to become flexible, has improved this hydrophone's sealed stability down. The locking section 52 has the specific function that the whole hand wheel 5 with the internal thread 56 therein is in threaded connection with the outer cylinder 1 through the internal thread 56 of the locking section 52, the clamping part 55 is also positioned on the outer peripheral surface of the locking section 52, and the locking section 52 is adjacent to the top press head 51, so that the clamping teeth 54 on the top press head 51 can be better embedded into the lower sealing gasket 4 by screwing the locking section 52 with a tool. The handheld head 53 is used for rotating the hand wheel 5 by free hand, when no tool is used or the hand wheel 5 is not rotated to be pressed on the lower sealing gasket 4, the handheld head 53 can be rotated by free hand to install the drainer, and the drainer is convenient to use. The latch 54 includes a clockwise tooth surface 541 and an anticlockwise tooth surface 542, the anticlockwise tooth surface 542 is perpendicular to the bottom surface of the lower gasket 4, the clockwise tooth surface 541 intersects the bottom surface of the lower gasket 4 at an acute angle, and the inclination direction of the clockwise tooth surface 541 is opposite to the screwing direction when the locking section 52 rotates to approach the lower gasket 4. The screwing direction of the screw thread is the same with the direction of the tooth following surface 541, so that the latch 54 can be easily embedded into the lower sealing gasket 4 due to the existence of the tooth following surface 541, and after the latch 54 is embedded into the lower sealing gasket 4, the reverse tooth surface 542 is vertical to the bottom surface of the lower sealing gasket 4, the hand wheel 5 is not easy to generate reverse screw thread loosening due to the existence of the reverse tooth surface 542, particularly when the latch 54 is embedded into the lower sealing gasket 4, the lower sealing gasket 4 can be better clamped by the existence of the reverse tooth surface 542, the hand wheel 5 cannot generate screw thread loosening, and the sealing stability between the drainer and the washbasin is further improved. The outer side of the handheld head 53 is also provided with a plurality of evenly distributed long ribs 57. When a user holds and rotates the hand-holding head 53, the ribs 57 can effectively increase friction force between the hand-holding head and the hand of the user, and the hand wheel 5 is rotated to be easy and convenient to apply force.

As shown in fig. 1-7, a ring groove 11 is provided in the outer cylinder 1 at one side of the inner container 2, and the outer edge of the sealing part 61 abuts against the bottom of the ring groove 11. The arrangement of the ring groove 11 further enlarges the gap between the ring groove and the inner container 2. Still be equipped with on the outer peripheral face of inner bag 2 and be annular constant head tank 21, constant head tank 21 endotheca is equipped with the seal cover 6 that is the platykurtic, and the thickness of seal cover 6 slightly is less than the degree of depth of constant head tank 21, is equipped with the outside sealing 61 of protrusion constant head tank 21 on the seal cover 6, and the slope of sealing 61 sets up and sealing 61 supports with 1 medial surface of urceolus and leans on to form sealedly. The sealing sleeve 6 is flat and the diameter of the sealing sleeve 6 at the groove opening of the annular groove 11 is smaller than the maximum diameter, namely the sealing sleeve 6 is completely positioned in the annular groove 11 and is not contacted with the inner side surface of the outer barrel 1, the groove walls at the two sides of the positioning groove 21 can be well limited, the sealing sleeve 6 is prevented from sliding out of the positioning groove 21 under the driving of the sealing part 61 in the process of inserting and pulling the inner container 2, and the stability of the wide sealing sleeve 6 in the positioning groove 21 is relatively good. The thickness of the sealing portion 61 gradually decreases from one end close to the sealing sleeve 6 to the other end. Because the outer edge of sealing 61 when contacting with urceolus 1 medial surface, the thickness of sealing 61 reduces from being close to seal cover 6 one end to the other end gradually, and the benefit of setting up like this reduces the wall thickness on the outer edge of sealing 61 for it produces deformation bending more easily, thereby reduce and urceolus 1 between frictional force, further made things convenient for the plug of inner bag 2.

The sealing part 61 is obliquely arranged, the sealing part 61 abuts against the inner side surface of the outer cylinder 1 to form a seal, and the sealing part 61 can be bent towards the sealing sleeve 6 when being pressed by the outer cylinder 1. The sealing part 61 is in contact with the inner side surface of the outer cylinder 1 at the maximum outer diameter position, so that the contact area between the sealing part 61 and the inner side surface of the outer cylinder 1 can be effectively reduced, the friction resistance between the sealing part 61 and the inner side surface of the outer cylinder 1 is reduced, and the inner container 2 is smooth in the drawing process. And because the clearance between inner bag 2 and urceolus 1 is less, when inner bag 2 inserted in urceolus 1, sealing 61 can be through the crooked seal cover 6 of pressing close to realize reducing and the urceolus 1 between the frictional force for inner bag 2 is more smooth and easy at the plug in-process. And the inclination direction of the sealing part 61 is consistent with the insertion direction of the inner container 2, so that a certain guiding effect is achieved, and the smoothness of the insertion and extraction of the inner container 2 is further improved.

The outer side of the hand wheel 5 is further provided with a clamping portion 55 for clamping a tool, and the outer contour of the clamping portion 55 is in an outer octagonal shape and can be used for clamping a tool such as a wrench and the like the outer contour of a nut. The clamping teeth 54 are required to be pressed and embedded into the lower sealing gasket 4, the force required for screwing the hand wheel 5 is large, and the hand wheel 5 can not be screwed directly by hand, so that the clamping part 55 is arranged, the clamping part 55 is clamped by tools such as a wrench and the like to screw the hand wheel 5, the clamping teeth 54 can be well embedded into the lower sealing gasket 4 to be locked, and the stability of the water drainer connected with the washbasin is further improved. The shape of the clamping part 55 is similar to the outer contour of the nut, so that the arrangement structure is simple, convenient and practical.

Example two

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in the embodiment, the top surface of the hand wheel is provided with a plurality of clamping grooves which are uniformly distributed, the depth of each clamping groove is gradually reduced, and the depth reducing direction of each clamping groove is uniform and the same. The arrangement can achieve the same technical effect as the latch.

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 hydrophone down, includes urceolus (1) and pluggable inner bag (2) of connecting in urceolus (1) one end, still overlap in proper order on urceolus (1) and be equipped with sealed pad (3), lower sealing pad (4) and hand wheel (5), hand wheel (5) and urceolus (1) threaded connection, inner bag (2) outside is seted up and is annular constant head tank (21), a serial communication port, constant head tank (21) endotheca is equipped with seal cover (6), the thickness of seal cover (6) slightly is less than the degree of depth of constant head tank (21), be equipped with the outer sealing (61) of protrusion constant head tank (21) along circumference on seal cover (6), sealing (61) slope sets up and sealing (61) and urceolus (1) medial surface support to lean on and form sealedly, hand wheel (5) top surface is equipped with a plurality of evenly distributed's latch (54), and can push up when hand wheel (5) rebound push up lower sealing pad (4) and make under (54) embedding sealed 4) And the outer side of the hand wheel (5) is also provided with a clamping part (55) for clamping tools.

2. A downcomer according to claim 1, characterised in that the thickness of the sealing portion (61) decreases from one end to the other adjacent the sealing sleeve (6).

3. The drainer as claimed in claim 1 or 2, wherein the hand wheel (5) comprises an ejector head (51), a locking section (52) and a hand-held head (53) in sequence, the latch (54) is located on the top surface of the ejector head (51), the clamping part (55) is located on the outer circumferential surface of the locking section (52), and the inner side of the locking section (52) is further provided with an internal thread (56) for being in threaded connection with the outer cylinder (1).

4. A downcomer according to claim 3, characterised in that the outer profile of the clamping portion (55) is in the shape of an outer hexagon or an outer octagon.

5. A launch device according to claim 4, characterised in that the latch (54) comprises a clockwise (541) and an anticlockwise (542) surface, the anticlockwise surface (542) being perpendicular to the bottom surface of the lower seal (4), the clockwise surface (541) intersecting the bottom surface of the lower seal (4) at an acute angle, the higher end of the clockwise surface (541) being inclined in the opposite direction to the screwing direction when the locking section (52) is rotated closer to the lower seal (4).

6. A sewer according to claim 5, characterized in that the outside of the hand-held head (53) is provided with a plurality of evenly distributed elongated ribs (57).

7. A drainer according to claim 6, characterized in that a ring groove (11) is provided in the outer tub (1) on the side of the inner tub (2), and the outer edge of the sealing part (61) abuts against the bottom of the ring groove (11).

8. A downcomer according to claim 7, characterised in that the lower end of the upper gasket (3) is provided with a raised rib (31) in the form of an annular projection.