CN111434935B

CN111434935B - Suction cup

Info

Publication number: CN111434935B
Application number: CN201910035476.1A
Authority: CN
Inventors: 张宗智; 张元柏
Original assignee: Ten Sheng Assorted Houseware Co ltd
Current assignee: Ten Sheng Assorted Houseware Co ltd
Priority date: 2019-01-15
Filing date: 2019-01-15
Publication date: 2021-11-30
Anticipated expiration: 2039-01-15
Also published as: CN111434935A

Abstract

The invention relates to a suction cup, comprising: a sucking disc part, which comprises a seat body, a control part movably arranged on the seat body, a first flow passage and a second flow passage, wherein the seat body comprises a seat part and a disc part which can be elastically and deformably arranged on the seat part, the disc part can contact a base surface, the seat body is provided with a first air chamber, a second air chamber is formed between the control part and the seat body, the first flow passage is communicated with the first air chamber and the second air chamber, and the control part is provided with the second flow passage; a first check valve disposed in the first flow passage for openably closing the first flow passage and allowing fluid to flow from the first air chamber to the second air chamber; and the second one-way valve is arranged in the second flow passage, can openably close the second flow passage and allows the fluid to flow from the second air chamber to the outside.

Description

Suction cup

Technical Field

The invention relates to a suction cup.

Background

Please refer to taiwan patent No. I604134, a suction cup device, which comprises a suction cup, a check valve installed on the suction cup, an outer cover unit connected to the suction cup, and a manual exhaust valve installed on the outer cover unit, wherein the suction cup comprises a boss and an air storage chamber, the check valve is installed in a valve hole of the boss to allow air to be released from the air storage chamber to the outside of the boss, the outer cover unit comprises an air storage space communicated with the air storage chamber and an exhaust channel communicated from the air storage space to the outside, and the manual exhaust valve can change the exhaust channel from a closed state to an open state. The floating part of the manual exhaust valve is sleeved with an airtight ring and provided with an identification section, the airtight ring can move relative to the floating part or the airtight ring can deform, the airtight ring is separated from or sealed against the exhaust flow channel by operating the floating part, and the identification section can be positioned in the sucker under the negative pressure state and gradually exposes out of the sucker when the negative pressure is reduced so as to allow a user to identify the vacuum degree. The sucking disc device also comprises a spring which is propped between the floating piece and the outer cover unit.

However, the airtight ring of the prior art needs to be deformable to achieve the exhaust function, so the airtight ring of the prior art cannot be too thick and too hard, but needs to bear the thrust of the spring, so that the airtight ring and the spring are mutually contradictory, and often, when the negative pressure is, for example, 0.533 bar (which still maintains a considerable suction force), the airtight ring moves under the thrust of the spring, so that even if the negative pressure is continuously maintained in a state of, for example, 0.533 bar (bar), the manual exhaust valve is prone to expose the identification section arranged thereon due to the thrust of the spring, which results in misjudgment of the user, and the identification part cannot achieve the effect of providing the user with the negative pressure state, so the inventor finds that the problem needs to be improved through multiple tests and developments.

Therefore, there is a need for a new and improved suction cup to solve the above problems.

Disclosure of Invention

The main objective of the present invention is to provide a suction cup, which has a first one-way valve and a second one-way valve to increase the suction force, and a control member is not easily moved away from a cup portion by an external force in a negative pressure state.

To achieve the above object, the present invention provides a suction cup, comprising: a sucking disc part, which comprises a seat body, a control part movably arranged on the seat body, a first flow passage and a second flow passage, wherein the seat body comprises a seat part and a disc part which can be elastically and deformably arranged on the seat part, the disc part can contact a base surface, the seat body is provided with a first air chamber, a second air chamber is formed between the control part and the seat body, the first flow passage is communicated with the first air chamber and the second air chamber, and the control part is provided with the second flow passage; a first check valve disposed in the first flow passage for openably closing the first flow passage and allowing fluid to flow from the first air chamber to the second air chamber; and the second one-way valve is arranged in the second flow passage, can openably close the second flow passage and allows the fluid to flow from the second air chamber to the outside.

The control member further includes a ring plug portion, which is disposed around the seat portion.

The control piece is provided with a ring groove, the ring plug part is arranged in the ring groove, the ring plug part is annularly abutted between the ring groove and the seat part, the ring plug part is provided with an outer annular surface, the outer annular surface is provided with at least one convex ring, and the at least one convex ring is abutted against the inner wall of the seat part.

The control piece comprises an identification section, and the control piece can movably enable the identification section to move in the seat body and out of the seat body.

The identification segment itself has a color.

The sucker further comprises a cap which is arranged on the control piece and shields the second one-way valve.

At least one exhaust channel is formed between the cap and the control piece, and each exhaust channel is communicated with the second channel and the outside.

The cap is provided with at least one first combination structure, and the control piece is provided with at least one second combination structure mutually connected with the at least one first combination structure.

The seat body further comprises a cover part which is covered on the seat part, the cover part is provided with at least one first buckling part, the seat part is provided with at least one second buckling part which is mutually buckled with the at least one first buckling part, the cover part is provided with a through hole, and the control part movably penetrates through the through hole.

The control piece comprises an identification section, and the control piece can movably enable the identification section to move in the seat body and out of the seat body; the identification segment itself has a color; the sucking disc also comprises a cap which is arranged on the control piece and shields the second one-way valve; at least one exhaust channel is formed between the cap and the control piece, and each exhaust channel is communicated with the second channel and the outside; the cap is provided with at least one first combination structure, and the control piece is provided with at least one second combination structure mutually connected with the at least one combination structure; the number of the at least one first combination structure is plural, the number of the at least one second combination structure is plural, and each first combination structure is mutually buckled and combined with one second combination structure; the seat body also comprises a cover part which is covered on the seat part and is provided with at least one first buckling part, the seat part is provided with at least one second buckling part which is mutually buckled with the at least one first buckling part, the cover part is provided with a through hole, and the control part can movably pass through the through hole; the number of the at least one first buckling part is plural, the number of the at least one second buckling part is plural, the through hole and the control piece coaxially define a central axis, and the plural first buckling parts and the plural second buckling parts are respectively arranged around the central axis; at least one of the first buckling part and the second buckling part is provided with a guide inclined plane, and the guide inclined plane is gradually far away from the central axis in the radial direction towards the central axis; the seat body is additionally provided with an air inlet channel which circulates the first air chamber and the outside, the disk part is additionally provided with a pressure relief valve part, the pressure relief valve part is provided with a through hole communicated with the air inlet channel, and the through hole can openably close the air inlet channel; the number of the at least one exhaust flow channel is plural, the control piece is provided with the plural exhaust flow channels, and each exhaust flow channel is provided with a first exhaust section and a second exhaust section which is transverse to the first exhaust section; the control member has a color, the cap covers part of the control member and the identification section is exposed out of the cap; an elastic part which is elastically propped against the control part and the seat part is arranged between the control part and the seat part; the number of the at least one convex ring is plural, the ring plug part is provided with an inner ring surface relative to the outer ring surface, the ring groove is provided with a plurality of ring flanges, and the plurality of ring flanges radially abut against the inner ring surface; the first one-way valve and the second one-way valve are the same, the second one-way valve comprises a top section, a neck section and a bottom section, the neck section penetrates through the second flow passage, the top section is sealed and supported on a first port of the second flow passage, and the bottom section is sealed and supported on a second port of the second flow passage opposite to the first port; the bottom section is in a cross shape and is provided with a plurality of sealing and abutting pieces which are mutually transversely arranged; the sucking disc also comprises a hook, one of the seat body and the hook is provided with a first clamping structure, the other one is provided with a second clamping structure, the first clamping structure comprises a clamping hole and a lug forming the clamping hole, the clamping hole is open towards two opposite sides, the second clamping structure is provided with a clamping groove, the shape of the second clamping structure corresponds to the shape of the clamping hole, and the second clamping structure can penetrate through the clamping hole and clamp the lug by the clamping groove.

The invention has the beneficial effects that: the invention improves the airtight effect through the first one-way valve and the second one-way valve; in addition, the control piece is not easy to be exposed under the action of the elastic thrust of the elastic piece in a negative pressure state, so that the effect of the identification section is effectively exerted.

Drawings

Fig. 1 is a perspective view of a preferred embodiment of the present invention.

Fig. 2 is an exploded view of a preferred embodiment of the present invention.

Fig. 2A is a perspective view of a second check valve in accordance with a preferred embodiment of the present invention.

FIG. 2B is a perspective view of a cap according to a preferred embodiment of the present invention.

FIG. 3 is a cross-sectional view of a preferred embodiment of the present invention.

Fig. 3A is a partially enlarged view of fig. 3.

FIG. 4 is a state diagram of the present invention.

FIG. 5 is another usage state diagram of the preferred embodiment of the present invention.

Fig. 5A is a partially enlarged view of fig. 5.

Fig. 5B is another partial enlarged view of fig. 5.

1: suction cup 192: card ditch

2: base surface 193: wide diameter section

10: the suction disc 194: narrow diameter section

11: seat body 20: annular plug part

111: seat portion 21: outer annular surface

112: disk portion 22: convex ring

113: cover portion 23: inner ring surface

114: first engaging portion 30: first check valve

115: second locking portion 40: second check valve

116: perforation 41: tip section

12: the control member 42: neck segment

121: top surface 43: bottom section

122: peripheral surface 44: sealing sheet

123: identification section 50: elastic piece

124: second bonding structure 60: cap cover

13: first air chamber 61: first combination structure

14: second air chamber 70: exhaust runner

15: first flow path 71: first exhaust section

16: second flow passage 72: second exhaust section

161: first port 73: third exhaust stage

162: second port 80, 81: lead inclined plane

17: the ring groove 90: air inlet flow channel

171: the ring flange 91: pressure relief valve part

18: first catch structure 92: through hole

181: detent hole 93: base part

182: tab 94: oval press ring

19: hook 95: rib part

191: second catch structure L1: central axis

Detailed Description

The following description is given by way of example only, and is not intended to limit the scope of the invention.

Referring to fig. 1 to 5, which show a preferred embodiment of the present invention, the suction cup 1 of the present invention includes a suction cup 10, a first check valve 30 and a second check valve 40.

The suction cup member 10 includes a base body 11, a control member 12 movably disposed on the base body 11, a first flow channel 15 and a second flow channel 16, the base body 11 includes a base portion 111 and a disc portion 112 elastically deformable disposed on the base portion 111, the disc portion 112 can contact a base surface 2, the base body 11 is provided with a first air chamber 13, a second air chamber 14 is formed between the control member 12 and the base body 11, the first flow channel 15 communicates the first air chamber 13 and the second air chamber 14, the control member 12 is provided with the second flow channel 16; the first check valve 30 is disposed in the first flow passage 15, and openably closes the first flow passage 15, while allowing fluid to flow from the first air chamber 13 to the second air chamber 14; the second check valve 40 is disposed in the second flow passage 16, and openably closes the second flow passage 16, while allowing the fluid to flow from the second air chamber 14 to the outside; therefore, the fluid in the first air chamber 13 and the fluid in the second air chamber 14 can be discharged only in one direction through a first one-way valve 30 and a second one-way valve 40 to increase the adsorption force, and the control member 12 is not easily moved away from the tray portion 112 by an external force in a negative pressure state (e.g., a negative pressure of 0.533 bar). In this embodiment, an elastic member 50 is disposed between the control member 12 and the seat 111 to provide an elastic force to the control member 12; in detail, in the negative pressure state (for example, the negative pressure is 0.533 bar), the control member 12 is not easily moved toward the pushing direction of the elastic member 50. The fluid may be a gas or a liquid. In the present embodiment, the tray portion 112 is a silicone chuck, and is elastically deformable.

In the present embodiment, the first check valve 30 and the second check valve 40 are the same, but may be different in other embodiments, so that only the detailed features of the second check valve 40 will be described in detail below, and the first check valve 30 will not be described in detail. The second check valve 40 includes a top section 41, a neck section 42 and a bottom section 43, the neck section 42 penetrates the second flow channel 16, the top section 41 seals a first port 161 of the second flow channel 16, the bottom section 43 seals a second port 162 of the second flow channel 16 opposite to the first port 161; the bottom section 43 is cross-shaped, and the bottom section 43 is provided with a plurality of sealing sheets 44 arranged transversely to each other for facilitating deformation and providing better sealing effect. It should be noted that the first check valve 30 and the second check valve 40 are respectively made of deformable materials, so that the bottom section 43 can be deformed to seal and open the second port 162, and the fluid can enter only one way.

The control member 12 further includes a ring plug portion 20, the ring plug portion 20 is annularly abutted against the seat portion 111, the control member 12 is provided with a ring groove 17, the ring plug portion 20 is arranged in the ring groove 17, the ring plug portion 20 is annularly abutted between the ring groove 17 and the seat portion 111 to prevent the ring plug portion 20 from sliding relative to the control member 12, so that a better air-tight effect is provided between the control member 12 and the seat portion 111; in the present embodiment, the annular plug 20 is a ring detachably sleeved on the control member 12, and the ring is made of an elastically deformable material; in other embodiments, the ring plug portion may be integrally disposed on the control member; in detail, the ring plug 20 has an outer ring surface 21, the outer ring surface 21 has at least one protruding ring 22, and the at least one protruding ring 22 is abutted against the inner wall of the seat 111, so that the control member 12 can be tightly pressed against the inner wall of the seat 111 to achieve an airtight effect, and an airtight state is maintained between the control member 12 and the seat 111. In this embodiment, the number of the at least one protruding ring 22 is plural, and the plural protruding rings 22 are spaced apart from each other, so as to achieve the effect of smoothly moving and tightly pressing to achieve the airtight effect. The ring plug 20 has an inner annular surface 23 opposite to the outer annular surface 21, the ring groove 17 has a plurality of ring flanges 171, the ring flanges 171 radially abut against the inner annular surface 23, so that the outer convex rings 22 of the outer annular surface 21 can be pressed against the inner wall of the seat 111 to improve the airtight effect.

The suction cup 1 further includes a cap 60, the cap 60 is disposed on the control member 12 and covers the second check valve 40 to protect the second check valve 40 therein, so as to prevent the second check valve 40 from being separated from the second flow channel 16 by external force. Preferably, at least one exhaust flow channel 70 is formed between the cap 60 and the control member 12, each exhaust flow channel 70 is communicated with the second flow channel 16 and the outside, the second check valve 40 openably closes the second flow channel 16 to allow fluid to flow from the second flow channel 16 to the at least one exhaust flow channel 70; in this embodiment, the number of the at least one exhaust channel 70 is plural, the control member 12 is provided with the plural exhaust channels 70, each exhaust channel 70 is provided with a first exhaust section 71 and a second exhaust section 72 transverse to the first exhaust section 71, the first exhaust section 71 is transversely communicated with the second channel 16, and the second exhaust section 72 is communicated with the first exhaust section 71 for facilitating fluid exhaust. In detail, the axial section of the control member 12 is n-shaped, the outer side of the control member 12 is provided with a top surface 121 and a peripheral surface 122, each exhaust channel 70 is further provided with a third exhaust section 73 transverse to the second exhaust section 72, the top surface 121 is provided with the first exhaust section 71, the peripheral surface 122 is provided with the second exhaust section 72, and the control member 12 and the cap 60 together form the third exhaust section 73 to smoothly guide the fluid to be exhausted. In other embodiments, each exhaust channel does not limit the number of exhaust segments, and can be varied according to requirements.

The control member 12 includes an identification section 123, and the control member 12 can move the identification section 123 in the seat 11 and outside the seat 11, so as to identify a vacuum degree by exposing the identification section 123 in or out of the seat 11, for example, the identification section 123 gradually exposes out of the seat 11 to show a decrease in the vacuum degree. In the present embodiment, the identification section 123 has a color, and more specifically, the control element 12 has a color, the cap 60 covers a portion of the control element 12, the identification section 123 exposes the cap 60, the identification section 123 is a portion of the control element 12, and the control element 12 and the identification section 123 are formed in a color when they are integrally formed, so as to facilitate manufacturing and simplify the manufacturing process without the problem that the identification section 123 is separated from the control element 12; in this embodiment, the identification segment 123 may also be a ring bump. In other embodiments, the identification section may be a color code machined into the control member. It should be noted that the identification section 123 is not exposed outside the seat body 11 in the negative pressure state, so as to improve the accuracy of determining the negative pressure state.

In addition, the cap 60 is provided with at least one first coupling structure 61, and the control member 12 is provided with at least one second coupling structure 124 connected with the at least one first coupling structure 61. In this embodiment, the number of the at least one first combining structure 61 is plural, the number of the at least one second combining structure 124 is plural, and each first combining structure 61 and one of the second combining structures 124 are mutually fastened and combined, so that the two can be mutually fastened and combined. In other embodiments, each of the first coupling structures and each of the second coupling structures may be an internal thread and an external thread screwed with each other.

It should be noted that the base 11 further includes a cover portion 113, the cover portion 113 is covered on the seat portion 111, the cover portion 113 is provided with at least one first fastening portion 114, the seat portion 111 is provided with at least one second fastening portion 115 fastened with the at least one first fastening portion 114, the cover portion 113 is provided with a through hole 116, the control member 12 movably passes through the through hole 116, and thus the cover portion 113 is not easily separated from the base 11. In this embodiment, the number of the at least one first locking portion 114 is plural, the number of the at least one second locking portion 115 is plural, the through hole 116 and the control member 12 coaxially define a central axis L1, and the plural first locking portions 114 and the plural second locking portions 115 are respectively disposed around the central axis L1 to enhance the combining effect. In addition, at least one of the first locking portion 114 and the second locking portion 115 is provided with a guiding inclined surface, and the guiding inclined surface is radially away from the central axis L1 towards the central axis L1, so as to facilitate smooth installation; in this embodiment, the guiding

inclined planes

80 and 81 are respectively disposed on each of the first locking portions 114 and each of the second locking portions 115, and the guiding inclined plane 80 of each of the first locking portions 114 gradually gets away from the central axis L1 from the cover portion 113 to the seat portion 111 from the inside to the outside in the radial direction; the guiding inclined surface 81 of each second locking portion 115 is gradually separated from the central axis L1 from the cover portion 113 to the seat portion 111 from the inside to the outside in the radial direction from the inside to the outside away from the central axis L1.

Furthermore, the base body 11 is further provided with an inlet flow channel 90, the inlet flow channel 90 circulates the first air chamber 13 and the outside, the disc portion 112 is further provided with a relief valve portion 91, the relief valve portion 91 is provided with a through hole 92 communicating with the inlet flow channel 90, and the through hole 92 openably closes the inlet flow channel 90. In detail, the pressure relief valve 91 further includes a base 93, an oval pressing ring 94 and a plurality of ribs 95 extending radially, each rib 95 is connected between the oval pressing ring 94 and the base 93, the base 93 is provided with the through hole 92, so as to press the two opposite sides of the oval pressing ring 94, thereby facilitating the deformation of the base 93 to open the through hole 92, so as to achieve the pressure relief effect, and prevent the base 93 from being excessively deformed, in other embodiments, the oval pressing ring may also be in a regular circle shape, a square shape, a polygon shape, or the like.

In addition, the suction cup 1 further includes a hook 19, one of the seat 11 and the hook 19 is provided with a first engaging structure, and the other is provided with a second engaging structure, in this embodiment, the seat 11 is provided with the first engaging structure 18, the hook 19 is provided with the second engaging structure 191, the first engaging structure 18 includes an engaging hole 181 and a protruding piece 182 forming the engaging hole 181, the engaging hole 181 is open towards two opposite sides, the second engaging structure 191 is provided with a groove 192, the shape of the second engaging structure 191 is slightly corresponding to the shape of the engaging hole 181, and the second engaging structure 191 can pass through the engaging hole 181 and engage the protruding piece 182 with the groove 192. In detail, the second latching structure 191 is in a sheet shape, the second latching structure 191 includes a wide section 193 and a narrow section 194, and the wide section 193 and the narrow section 194 can respectively abut against the protruding piece 182 to improve the coupling force.

In use, when the control member 12 is pressed to move relative to the seat 11, the air pressure of the second air chamber 14 deforms the second check valve 40 to open the second flow channel 16, so that the fluid is discharged from the second air chamber 14 to form an airtight state, and the fluid in the first air chamber 13 flows through the pressure difference with the second air chamber 14 to cause the first check valve 30 to deform (in this embodiment, the first check valve 30 is pushed) so that the fluid flows into the second air chamber 14, thereby achieving a vacuum effect, and thus having a better adsorption effect.

In summary, the present invention improves the airtight effect through the first one-way valve and the second one-way valve; in addition, the control member is not easily subjected to the elastic pushing force of the elastic member to expose the identification section in a negative pressure state (for example, the negative pressure is 0.533 bar), so as to effectively exert the effect of the identification section.

Claims

1. A suction cup, characterized in that: the method comprises the following steps:

a sucking disc part, which comprises a seat body, a control part movably arranged on the seat body, a first flow passage and a second flow passage, wherein the seat body comprises a seat part and a disc part which can be elastically and deformably arranged on the seat part, the disc part can contact a base surface, the seat body is provided with a first air chamber, a second air chamber is formed between the control part and the seat body, the first flow passage is communicated with the first air chamber and the second air chamber, and the control part is provided with the second flow passage;

a first check valve disposed in the first flow passage for openably closing the first flow passage and allowing fluid to flow from the first air chamber to the second air chamber;

a second check valve provided in the second flow passage to openably close the second flow passage and allow the fluid to flow from the second air chamber to the outside;

wherein, the sucker also comprises a cap which is arranged on the control piece and shields the second one-way valve;

wherein, at least one exhaust channel is formed between the cap and the control piece, and each exhaust channel is communicated with the second channel and the outside;

wherein the second one-way valve openably closes the second flow passage while allowing fluid to flow from the second flow passage to the at least one exhaust flow passage;

wherein, each exhaust flow passage is provided with a first exhaust section and a second exhaust section which is transverse to the first exhaust section; the outer side of the control piece is provided with a top surface and a peripheral surface, the top surface is provided with the first exhaust section, and the peripheral surface is provided with the second exhaust section;

the first exhaust section is transversely communicated with the second flow channel, and the second exhaust section is communicated with the first exhaust section.

2. The chuck as set forth in claim 1, wherein: the control member further includes a ring plug portion, which is disposed around the seat portion.

3. The chuck as set forth in claim 2, wherein: the control piece is provided with a ring groove, the ring plug part is arranged in the ring groove, the ring plug part is annularly abutted between the ring groove and the seat part, the ring plug part is provided with an outer annular surface, the outer annular surface is provided with at least one convex ring, and the at least one convex ring is abutted against the inner wall of the seat part.

4. The chuck as set forth in claim 1, wherein: the control piece comprises an identification section, and the control piece can movably enable the identification section to move in the seat body and out of the seat body.

5. The chuck as set forth in claim 4, wherein: the identification segment itself has a color.

6. The chuck as set forth in claim 1, wherein: the cap is provided with at least one first combination structure, and the control piece is provided with at least one second combination structure mutually connected with the at least one first combination structure; each first combination structure is mutually buckled and combined with one second combination structure.

7. The chuck as set forth in claim 1, wherein: the seat body further comprises a cover part which is covered on the seat part, the cover part is provided with at least one first buckling part, the seat part is provided with at least one second buckling part which is mutually buckled with the at least one first buckling part, the cover part is provided with a through hole, and the control part movably penetrates through the through hole.

8. The chuck as set forth in claim 3, wherein: the control piece comprises an identification section, and the control piece can movably enable the identification section to move in the seat body and out of the seat body; the identification segment itself has a color; the cap is provided with at least one first combination structure, and the control piece is provided with at least one second combination structure mutually connected with the at least one combination structure; the number of the at least one first combination structure is plural, the number of the at least one second combination structure is plural, and each first combination structure is mutually buckled and combined with one second combination structure; the seat body also comprises a cover part which is covered on the seat part and is provided with at least one first buckling part, the seat part is provided with at least one second buckling part which is mutually buckled with the at least one first buckling part, the cover part is provided with a through hole, and the control part can movably pass through the through hole; the number of the at least one first buckling part is plural, the number of the at least one second buckling part is plural, the through hole and the control piece coaxially define a central axis, and the plural first buckling parts and the plural second buckling parts are respectively arranged around the central axis; at least one of the first buckling part and the second buckling part is provided with a guide inclined plane, and the guide inclined plane is gradually far away from the central axis in the radial direction towards the central axis; the seat body is additionally provided with an air inlet channel which circulates the first air chamber and the outside, the disk part is additionally provided with a pressure relief valve part, the pressure relief valve part is provided with a through hole communicated with the air inlet channel, and the through hole can openably close the air inlet channel; the number of the at least one exhaust flow channel is plural, and the control piece is provided with the plural exhaust flow channels; the control member has a color, the cap covers part of the control member and the identification section is exposed out of the cap; an elastic part which is elastically propped against the control part and the seat part is arranged between the control part and the seat part; the number of the at least one convex ring is plural, the ring plug part is provided with an inner ring surface relative to the outer ring surface, the ring groove is provided with a plurality of ring flanges, and the plurality of ring flanges radially abut against the inner ring surface; the first one-way valve and the second one-way valve are the same, the second one-way valve comprises a top section, a neck section and a bottom section, the neck section penetrates through the second flow passage, the top section is sealed and supported on a first port of the second flow passage, and the bottom section is sealed and supported on a second port of the second flow passage opposite to the first port; the bottom section is in a cross shape and is provided with a plurality of sealing and abutting pieces which are mutually transversely arranged; the sucking disc also comprises a hook, one of the seat body and the hook is provided with a first clamping structure, the other one is provided with a second clamping structure, the first clamping structure comprises a clamping hole and a lug forming the clamping hole, the clamping hole is open towards two opposite sides, the second clamping structure is provided with a clamping groove, the shape of the second clamping structure corresponds to the shape of the clamping hole, and the second clamping structure can penetrate through the clamping hole and clamp the lug by the clamping groove.