CN215567203U - Suction cup - Google Patents

Abstract

The utility model discloses a suction cup, comprising: the suction cup comprises a suction cup main body, a suction cup fixing part and a suction cup fixing part, wherein the suction cup main body is provided with an adsorption surface contacted with a surface to be installed; the air pumping channel is arranged in the sucker main body, and an inlet of the air pumping channel is positioned on the adsorption surface; the piston piece is movably arranged in the air exhaust channel, and a sealing ring matched with the inner wall of the air exhaust channel is arranged on the piston piece; and the clinging mechanism is arranged on the piston piece and can enable the sealing ring to be clung to the piston piece so as to seal the gap between the sealing ring and the piston piece. Above-mentioned sucking disc is when the evacuation, orders about the space in the piston spare compression pumping channel, and gas can be discharged between the inner wall of sealing washer and pumping channel to be in the vacuum or be close vacuum state in making pumping channel, and hug closely the mechanism and can make the sealing washer paste tightly on the piston spare, avoid outside gas to let in pumping channel from the fit clearance between sealing washer and the piston spare, guarantee pumping channel's leakproofness, make the adsorption work of sucking disc more reliable and more stable.

Description

Suction cup

Technical Field

The utility model relates to the technical field of articles for daily use, in particular to a sucker.

Background

The traditional sucker is provided with a concave cavity, the sucker is fixed on a surface to be installed by exhausting air between the concave cavity and the surface to be installed, if the roughness of the surface to be installed is high, a tiny gap is easy to exist between the sucker and the surface to be installed, and air can slowly enter the concave cavity through the gap, so that the sucker is finally dropped; or the to-be-installed surface is provided with micro air holes which are easy to conduct the concave cavity with the outside, so that the sucking disc cannot be installed on the to-be-installed surface.

Therefore, the sucking disc of the prior art is provided with the air exhaust channel on the sucking disc main body, the inlet of the air exhaust channel is arranged on the adsorption surface of the sucking disc, the air exhaust component is arranged in the air exhaust channel and comprises a piston rod and a sealing ring which is sleeved on the piston rod and matched with the inner wall of the air exhaust channel, and the sealing ring plays a role of a one-way valve when moving downwards in the air exhaust channel to exhaust gas.

After the sucker is fixed on a surface to be installed, the air pressure in the air exhaust channel is far lower than the atmospheric pressure, so that external air easily enters the air exhaust channel from a gap between the sealing ring and the piston rod, and the air in the air exhaust channel slowly enters the adsorption surface along with the lapse of time to cause the sucker to fall off.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides the sucker with good air tightness and stable and reliable adsorption, and the sucker can prevent external air from being introduced into the air exhaust channel from a gap between the sealing ring and the piston piece.

A suction cup according to an embodiment of the present invention includes: the suction cup comprises a suction cup main body, a suction cup body and a suction cup, wherein the suction cup main body is provided with a suction surface which is in contact with a surface to be mounted; the air suction channel is arranged in the sucker main body, and an inlet of the air suction channel is positioned on the adsorption surface; the piston piece is movably arranged in the air exhaust channel, and a sealing ring matched with the inner wall of the air exhaust channel is arranged on the piston piece; and the clinging mechanism is arranged on the piston piece and can enable the sealing ring to be clung to the piston piece so as to seal the gap between the sealing ring and the piston piece.

The sucker provided by the embodiment of the utility model has at least the following beneficial effects:

constitute the structure of check valve between the sealing washer of above-mentioned sucking disc and bleed passage's the inner wall, when evacuation operation, order about the space in the piston spare compression bleed passage, the gas that is located bleed passage this moment flushes the sealing washer and discharges from the clearance between the inner wall of sealing washer and bleed passage, thereby make and be in the vacuum in the bleed passage or be close vacuum state, and hugging closely the mechanism can make the sealing washer paste tightly on the piston spare, avoid outside gas to let in bleed passage from the fit clearance between sealing washer and the piston spare, guarantee bleed passage's leakproofness, make the adsorption work of sucking disc more reliable and more stable.

In some embodiments of the present invention, the piston member includes a piston portion located in the air exhaust passage and an operating rod connected to the piston portion and extending out of the air exhaust passage, and the abutting mechanism includes an abutting member interposed between the operating rod and the seal ring.

The piston part is driven to move downwards in the air exhaust channel by controlling the operating rod, air in the air exhaust channel is exhausted, a user can conveniently perform vacuum pumping operation, the jacking piece is clamped between the operating rod and the sealing ring and jacks the sealing ring on the piston part, a gap between the sealing ring and the piston part is eliminated, and external air is prevented from entering the air exhaust channel.

In some embodiments of the utility model, in order to simplify the production and assembly process, it is ensured that the top member can be tightly connected to the operating rod, the top member being integrally injection-molded with the operating rod.

In some embodiments of the utility model, in order to further improve the sealing performance of the top member against the sealing ring, the contact area of the top member and the sealing ring is annular to form an annular sealing area, and the annular sealing area can prevent gas from entering between the top member and the sealing ring.

In some embodiments of the present invention, the piston member includes a piston portion located in the air exhaust passage and an operating rod connected to the piston portion and extending out of the air exhaust passage, and the abutting mechanism is an adhesive fixed between the sealing ring and the piston portion. The adhesive bonds the seal ring and the piston portion to further seal the gap between the seal ring and the piston member.

In some embodiments of the present invention, in order to further improve the air tightness between the end surface of the sealing ring and the piston portion, the sealing ring or the piston portion is provided with a plurality of annular sealing portions between the end surface of the sealing ring and the piston portion. If the top tight piece still has the air gap with the terminal surface top tight in piston portion of sealing washer, annular seal portion can further obstruct the gas entering in the air bleed passageway.

As a further preferred feature of the above aspect, the annular seal portion is located within a range of a vertical projection area of the urging member. When the pushing piece applies force to the sealing ring downwards, the annular sealing part is located in the range of the vertical projection area of the pushing piece, so that the annular sealing part is directly stressed and deformed, and the air tightness between the sealing ring and the piston part is ensured.

In some embodiments of the present invention, a first annular protrusion is disposed on an inner side wall of the air exhaust channel, a connecting portion is disposed on the piston portion and passes through the sealing ring and the first annular protrusion in sequence to be detachably connected to the operating rod, an end cap is disposed at an end of the operating rod away from the piston portion, and a return elastic member is disposed between the end cap and the first annular protrusion.

The piston piece is convenient to assemble in the mode that connecting portion and action bars can dismantle and be connected, and the elastic component that resets helps the motion that resets of piston piece. When the piston part is close to the inlet of the air exhaust channel, air can pass through the inner side wall of the sealing ring and the air exhaust channel, otherwise, air cannot pass through the inner side wall of the sealing ring and the air exhaust channel, so that the air between the sucker body and the mounting surface to be mounted is exhausted, the vacuum degree in the air exhaust channel can be improved by repeatedly exhausting, and the adsorption surface is adsorbed on the mounting surface to be mounted to the maximum degree.

In some embodiments of the present invention, the connecting portion includes a threaded post, and the operating rod is provided with an internal threaded hole matched with the threaded post; or the connecting part comprises an internal thread hole, and the operating rod is provided with a threaded column matched with the internal thread hole.

When screwing up the action bars on connecting portion, can press from both sides tight the piece of top and fix between action bars and sealing washer to utilize the piece of top to push up the terminal surface top of sealing washer tightly on piston portion, this piston spare structure is ingenious, and manufacturing, equipment are all comparatively convenient.

In some embodiments of the present invention, the connecting portion is an elastic buckle, and a slot matched with the elastic buckle is disposed on the operating rod. The elastic buckle is inserted into the clamping groove, and the jacking piece is clamped and fixed between the operating rod and the sealing ring, so that the piston piece of the structure is convenient to assemble.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a suction cup according to an embodiment of the present invention;

FIG. 2 is an internal cross-sectional schematic view of the embodiment of FIG. 1;

FIG. 3 is an enlarged partial view of portion A of FIG. 2;

FIG. 4 is an exploded view of the embodiment of FIG. 2;

fig. 5 is an internal cross-sectional view of another embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the positional or orientational descriptions referred to, for example, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are based on the positional or orientational relationships shown in the drawings and are for convenience of description and simplicity of description only, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, 2 and 4, a suction cup according to an embodiment of the present invention includes: a suction cup main body 100, the suction cup main body 100 having a suction surface 101 which is in contact with a surface to be mounted; the air exhaust channel 200, the air exhaust channel 200 is arranged in the sucker main body 100, and the inlet of the air exhaust channel 200 is positioned on the adsorption surface 101; the piston piece 300 is movably arranged in the air exhaust channel 200, and a sealing ring 400 matched with the inner wall of the air exhaust channel 200 is arranged on the piston piece 300; the abutting mechanism 500 is disposed on the piston member 300, and can make the sealing ring 400 abut on the piston member 300 to seal the air exhaust passage 200.

The structure of the check valve is formed between the sealing ring 400 of the sucking disc and the inner wall of the air exhaust channel 200, when the sucking disc is vacuumized, the piston 300 is driven to compress the space in the air exhaust channel 200, at the moment, the air in the air exhaust channel 200 rushes the sealing ring 400 to be exhausted from the gap between the sealing ring 400 and the inner wall of the air exhaust channel 200, the piston 300 moves downwards to enable the air exhaust channel 200 to be in a vacuum state or a state close to the vacuum state, the adsorption surface 101 can be adsorbed and fixed on the surface to be installed, the clinging mechanism 500 can enable the sealing ring 400 to be clung to the piston 300, external air is prevented from being introduced into the air exhaust channel 200 from the matching gap between the sealing ring 400 and the piston 300, the sealing performance of the air exhaust channel 200 is guaranteed, and the adsorption work of the sucking disc is more stable and reliable.

Referring to FIG. 2, in some embodiments of the present invention, the piston member 300 includes a piston portion 310 located in the pumping channel 200 and a lever 320 connected to the piston portion 310 and extending out of the pumping channel 200, and the tightening mechanism 500 includes a tightening member interposed between the lever 320 and the sealing ring 400.

The operating rod 320 is controlled to drive the piston part 310 to move downwards in the air exhaust channel 200, so that air in the air exhaust channel 200 is exhausted, a user can conveniently perform vacuum pumping operation, the jacking piece is clamped between the operating rod 320 and the sealing ring 400 to jack the sealing ring 400 on the piston part 310, a gap between the sealing ring 400 and the piston part 310 is eliminated, and external air is prevented from flowing into the air exhaust channel 200 from a position between the sealing ring 400 and the piston part 310.

Referring to fig. 4, preferably, in order to prolong the service life of the piston part 310, the piston part 310 is made of hard plastic, and in order to ensure the air tightness between the sealing ring 400 and the inner wall of the pumping channel 200, the sealing ring 400 is a leather cup made of soft plastic, in this embodiment, the top tightening member is used for pressing the sealing ring 400 on the piston part 310, and in order to ensure the working reliability of the top tightening member, the top tightening member is also made of hard plastic.

In some embodiments of the present invention, in order to simplify the manufacturing and assembly process, it is ensured that the top member can be tightly coupled to the operating rod 320, and the top member is integrally injection-molded with the operating rod 320.

In some embodiments of the utility model, to further improve the sealing of the top member against the sealing ring 400, the area of the top member in contact with the sealing ring 400 is annular to form an annular sealing area that prevents gas from entering between the top member and the sealing ring 400.

Referring to fig. 2, in some embodiments of the present invention, the piston member 300 includes a piston portion 310 located in the pumping channel 200 and an operating rod 320 connected to the piston portion 310 and extending out of the pumping channel 200, and the close fitting mechanism 500 is an adhesive glue adhesively fixed between the sealing ring 400 and the piston portion 310. The adhesive bonds the seal ring 400 and the piston portion 310, thereby further sealing the gap between the seal ring 400 and the piston member 300.

Of course, in other embodiments, the abutting mechanism 500 is not limited to the manner of the abutting member, and any structure that can make the contact surfaces of the sealing ring 400 and the piston portion 310 fit or fit tightly can be understood as the embodiment of the abutting mechanism 500, for example, the abutting mechanism 500 may be a clamping component that clamps the sealing ring 400 and the piston portion 310, or the abutting mechanism 500 may be a plastic connector that is inserted into the sealing ring 400 and the piston portion 310, and is connected to the sealing ring 400 and the piston portion 310 in a sealing manner, and the plastic connector also plays a role in clamping the sealing ring 400 and the piston portion 310.

Referring to fig. 3, in some embodiments of the present invention, in order to further improve the air tightness between the end surface of the sealing ring 400 and the piston portion 310, the sealing ring 400 or the piston portion 310 is provided with a plurality of annular sealing portions 410 between the end surface of the sealing ring 400 and the piston portion 310. In this embodiment, the annular sealing portion 410 is disposed on the end surface of the sealing ring 400 facing the piston portion 310, and if there is still an air gap after the abutting member abuts the end surface of the sealing ring 400 against the piston portion 310, the annular sealing portion 410 can further block the gas from entering the pumping channel 200. According to the requirement of sealing performance, different numbers of the annular sealing parts 410 can be provided, and when the annular sealing parts 410 are provided in plurality, the annular sealing parts 410 are distributed at intervals along the radial direction of the piston part 310 and are sequentially sleeved.

As a further preference of the above solution, the annular sealing portion 410 is located within a range of a vertical projection area of the top member. When the tightening member applies a downward force to the sealing ring, the annular sealing portion 410 is located within the range of the vertical projection area of the tightening member, so that the annular sealing portion 410 is directly deformed by the force, and the air tightness between the sealing ring and the piston portion is ensured. Wherein the sealing ring 400 and the annular sealing portion 410 are made of an elastic material.

Referring to fig. 2 and 4, in some embodiments of the present invention, a first annular protrusion 210 is disposed on an inner sidewall of the pumping channel 200, a connecting portion 311 is disposed on the piston portion 310 and passes through the sealing ring 400 and the first annular protrusion 210 in sequence to detachably connect with the operating rod 320, an end cap 321 is disposed on an end of the operating rod 320 far from the piston portion 310, and a return elastic member 600 is disposed between the end cap 321 and the first annular protrusion 210.

The coupling portion 311 is detachably coupled to the operating rod 320 in such a manner that the piston member 300 is assembled, and the return elastic member 600 facilitates the return movement of the piston member 300. When the piston portion 310 is close to the inlet of the air exhaust channel 200, air can pass between the sealing ring 400 and the inner side wall of the air exhaust channel 200, otherwise, air cannot pass between the sealing ring 400 and the inner side wall of the air exhaust channel 200, so that air between the suction cup main body 100 and the surface to be mounted is exhausted, the vacuum degree in the air exhaust channel 200 can be improved by repeatedly exhausting, and the adsorption surface 101 is adsorbed on the surface to be mounted to the maximum extent. It will be appreciated that the tightening member follows the downward movement of the piston member 300, and thus, preferably, the tightening member can freely pass through the first annular protrusion 210.

Referring to fig. 5, in some embodiments of the present invention, the connecting portion 311 includes a threaded post, and the operating rod 320 has an internally threaded hole for engaging with the threaded post, or the connecting portion 311 includes an internally threaded hole, and the operating rod 320 has a threaded post for engaging with the internally threaded hole. Referring to fig. 5, in this embodiment, the connecting portion 311 includes a threaded column, the operating rod 320 is provided with an internal threaded hole, the internal threaded hole of the operating rod 320 is screwed on the threaded column, and the tightening member can be clamped and fixed between the operating rod 320 and the sealing ring 400, so that the end surface of the sealing ring 400 is tightened on the piston portion 310 by the tightening member, the piston member 300 has a smart structure, and the processing, manufacturing and assembling are convenient. Of course, in other embodiments, the detachable connection between the operating rod 320 and the piston portion 310 may be configured in other ways, such as a plug-in fit.

Referring to fig. 2, in some embodiments of the present invention, the connecting portion 311 is an elastic buckle, and the operating rod 320 is provided with a slot matching with the elastic buckle. The elastic buckle is inserted into the clamping groove, and the jacking piece is clamped and fixed between the operating rod 320 and the sealing ring 400, so that the piston piece 300 with the structure is convenient to assemble.

Referring to fig. 2, 3 and 4, in some embodiments of the present invention, in order to prevent the top member from being separated from the position between the operating rod 320 and the sealing ring 400, and to secure the airtightness of the pumping channel 200, the top member is fitted to the outside of the connection portion 311. The tightening member is annular, and the tightening member cannot be radially separated from the connecting portion 311 of the piston portion 310, and is also always clamped between the operating rod 320 and the seal ring 400.

Referring to fig. 2 and 4, in some embodiments of the present invention, the suction surface 101 is substantially planar, and the suction surface 101 can be attached to a surface to be mounted and form a plurality of suction cavities.

When the air exhaust channel 200 is vacuumized, air between the adsorption surface 101 and the surface to be installed enters the air exhaust channel 200 from the inlet and is then exhausted, the adsorption surface 101 is closely attached to the surface to be installed, along with continuous air exhaust, the adsorption surface 101 generates a plurality of tiny adsorption cavities according to the surface condition of the surface to be installed, the adsorption main body 100 is firmly adsorbed on the surface to be installed by utilizing a large number of tiny adsorption cavities, the adsorption effect is better, and the durability is longer. The sucker with the structure can be suitable for the mounting surface to be mounted with high surface roughness and air holes, and has wide application range.

The suction surface 101 is preferably a plane, but it is understood by those skilled in the art that the same technical effects can be achieved if the suction surface 101 is disposed in a shape close to a plane, so the suction surface 101 may be a plane or a shape close to a plane, such as a conical surface with a cone angle close to 180 degrees or a plane with fine protrusions.

In order to further improve the connection strength and reduce the slow permeation of air, the absorption surface 101 may be made of a material with certain viscosity, such as TPE, TPR, silicone, rubber, or PVC.

Referring to fig. 4, in some embodiments of the present invention, the sucker main body 100 includes a sucker cover 110 and an absorbing layer 120, the sucker cover 110 has a mounting location therein, the absorbing layer 120 is located in the mounting location, and an end surface of the absorbing layer 120 away from the bottom of the mounting location is an absorbing surface 101. The suction cup cover 110 in the suction cup main body 100 with the structure can be used for installing the adsorption layer 120, can also be used as a decorative cover in actual use, and is simple and ingenious in structure.

In experiments, the flatness of the suction surface 101 affects the connection strength between the suction cup main body 100 and the surface to be mounted, and in order to improve the flatness of the suction surface 101 as much as possible, the bottom of the mounting position is set to be a plane, which can help to improve the flatness of the suction surface 101 after injection molding. Of course, in some embodiments, the bottom of the mounting portion may be configured to be approximately planar, and the same technical effect may be achieved, for example, the bottom of the mounting portion may be configured to be approximately conical surface, and when the cone angle is approximately 180 °, the conical surface is approximately planar, and the similar effect may be achieved.

Referring to fig. 4, in some embodiments, the adsorption layer 120 and the suction cup cover 110 are integrally formed by injection molding, the adsorption layer 120 and the suction cup cover 110 are integrally formed to ensure that the air does not leak between the two, and the air tightness is strong, and the suction cup cover 110 is made of hard plastic, so that the overall rigidity of the suction cup body 100 can be increased, and the bearing capacity can be improved.

In addition, it is understood by those skilled in the art that the absorption layer 120 can be connected to the suction cup cover 110 by other means, for example, the absorption layer 120 and the suction cup cover 110 can be separately manufactured and then assembled with each other, the absorption layer 120 and the suction cup cover 110 can be fixed by glue, and the like, so that the production division is more detailed, and the injection molding efficiency of the absorption layer 120 can be improved.

Referring to fig. 1, 2 and 4, in some embodiments of the present invention, a mounting case 700 is disposed outside the sucker cover 110, a plurality of mounting hooks 111 are disposed on the sucker cover 110, and a mounting groove 710 matched with the mounting hooks 111 is disposed on the mounting case 700. Wherein, the installation shell 700 is the holistic shell of sucking disc, according to the needs of usage, can set up corresponding suspended structure who is used for hanging article on installation shell 700, for example set up couple, peg etc. on installation shell 700. The provision of the mounting hook 111 on the suction cup cover 110, in cooperation with the provision of the mounting groove 710 on the mounting case 700, facilitates quick mounting between the suction cup cover 110 and the mounting case 700. In addition, it is conceivable to those skilled in the art that the suction cup cover 110 and the mounting case 700 may be assembled by other means, for example, by fastening with screws.

Referring to fig. 4, in some embodiments of the present invention, when the mounting hook 111 is disposed on the sucker cover 110 and the mounting groove 710 is disposed on the mounting shell 700, in order to prevent the mounting hook 111 from moving in the mounting groove 710 and further prevent the sucker cover 110 from moving relative to the mounting shell 700 and affecting the working stability of the sucker, the positioning element 800 capable of preventing the mounting hook 111 from moving relative to the mounting groove 710 is detachably mounted on the mounting shell 700.

Referring to fig. 4, in some embodiments of the present invention, the installation hook 111 has a plurality of installation hooks 111, the installation hooks 111 are circumferentially distributed at intervals, each installation hook 111 is substantially arc-shaped, correspondingly, the installation groove 710 is substantially circular ring-shaped, and the positioning member 800 includes a circular ring portion 810 located in the installation groove 710 and used for pressing the installation hook 111 against the inner side wall of the installation groove 710, and a positioning protrusion 820 connected to the circular ring portion 810 and interposed between two adjacent installation hooks 111. The circular ring part 810 can prevent the installation hook part 111 from displacing along the radial direction of the installation groove 710, the positioning lug 820 can prevent the installation hook part 111 from displacing along the circumferential direction of the installation groove 710, and the positioning piece 800 with the circular ring part 810 and the positioning lug 820 can position and fix the sucker cover 110 on the corresponding position of the installation shell 700. The circular ring part 810 and the plurality of positioning bumps 820 thereon are integrally formed by injection molding of hard plastic, the circular ring part 810 is clamped between the mounting hook part 111 and the mounting groove 710 to form a close fit relationship, and the positioning element 800 is not required to be fixed by other fixing structures.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A suction cup, comprising:

a suction cup main body (100), the suction cup main body (100) having a suction surface (101) that contacts a surface to be mounted;

the air suction channel (200), the air suction channel (200) is arranged in the sucker main body (100), and the inlet of the air suction channel (200) is positioned on the adsorption surface (101);

the piston piece (300) is movably arranged in the air exhaust channel (200), and a sealing ring (400) matched with the inner wall of the air exhaust channel (200) is arranged on the piston piece (300);

and a fitting mechanism (500) provided on the piston member (300) and adapted to fit the seal ring (400) to the piston member (300) to seal a gap between the seal ring (400) and the piston member (300).

2. A suction cup according to claim 1, wherein:

the piston piece (300) comprises a piston part (310) positioned in the air exhaust channel (200) and an operating rod (320) connected with the piston part (310) and extending out of the air exhaust channel (200), and the clinging mechanism (500) comprises a propping piece clamped between the operating rod (320) and the sealing ring (400).

3. A suction cup according to claim 2, wherein:

the top fastening piece and the operating rod (320) are integrally formed in an injection molding mode.

4. A suction cup according to claim 2, wherein:

the area of the top tightening piece contacted with the sealing ring (400) is annular to form an annular sealing area.

5. A suction cup according to claim 1, wherein:

the piston piece (300) comprises a piston part (310) positioned in the air exhaust channel (200) and an operating rod (320) connected with the piston part (310) and extending out of the air exhaust channel (200), and the clinging mechanism (500) is fixed on the sealing ring (400) and adhesive between the piston parts (310).

6. A suction cup according to claim 2, wherein:

the sealing ring (400) or the piston part (310) is provided with a plurality of annular sealing parts (410) which are positioned between the end surface of the sealing ring (400) and the piston part (310).

7. The suction cup according to claim 6, wherein:

the annular seal (410) is located within a range of a vertical projection area of the top member.

8. A suction cup according to claim 2, wherein:

be provided with first annular arch (210) on the inside wall of bleed passage (200), be equipped with on piston portion (310) and pass in proper order sealing washer (400) with first annular arch (210) and with connecting portion (311) that connecting can be dismantled in action bars (320), keep away from action bars (320) the one end of piston portion (310) is equipped with end cover (321), end cover (321) with be equipped with between first annular arch (210) and restore to the throne elastic component (600).

9. The suction cup according to claim 8, wherein:

the connecting part (311) comprises a threaded column, and an internal threaded hole matched with the threaded column is formed in the operating rod (320); or the connecting part (311) comprises an internal thread hole, and a threaded column matched with the internal thread hole is arranged on the operating rod (320).

10. The suction cup according to claim 8, wherein:

the connecting part (311) is an elastic buckle, and a clamping groove matched with the elastic buckle is arranged on the operating rod (320).

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