Air exhaust type one-way suction cup

Abstract

The suction type one-way suction cup comprises a cup body, a cup opening is formed in the bottom of the cup body and is in a concave shape, an installation part and a differential pressure pipe are arranged at the top of the cup body, and a differential pressure channel communicated with an inner cavity of the cup opening is formed in the differential pressure pipe. The differential pressure pipe extends outwards at the joint of the disc body, so that a compression section is formed at the pipe wall position of the differential pressure pipe, and a closed seam connected with the differential pressure channel is formed in one end, back on to the bottom of the disc body, of the differential pressure pipe; the air chamber and the disc cover are located at the top of the disc body, one end of the air chamber is communicated with the differential pressure pipe, a one-way piston is arranged in the air chamber, and the end, opposite to the differential pressure pipe, of the one-way piston is connected with a pressing piece extending out of the disc cover. A pressure maintaining spring used for pushing the one-way piston to move towards the top of the disc cover to enable the pressing piece to protrude outwards is further arranged in the air chamber. The utility model has the advantages of being suitable for adsorbing and fixing various commodity shelves, reliable in structure, and capable of being directly and integrally formed during injection molding or glue injection so as to have a one-way cut-off function.

Description

Technical Field

[0001] The utility model relates to the field of suction cups, and particularly relates to an air extraction type one-way suction cup. Background Art

[0002] The suction cup realizes fixation on the surface of an object to be adsorbed through adsorption, and is widely used as a core fixing component for fixing various articles; the traditional suction cup adopts extrusion of the suction cup to discharge the air in the cup opening to generate negative pressure so as to realize fixation on the surface of the object to be adsorbed during fixation. However, this fixation method has poor stability, especially when the suction cup is extruded, problems such as incomplete discharge of the air in the cup opening are likely to occur, resulting in the vacuum degree in the cup opening not reaching the fixation requirement; in view of this problem, suction cups with an air extraction function have been designed on the market, and the air in the cup opening is discharged by means of air extraction so as to improve the vacuum degree in the cup opening. Such suction cups often only have one air extraction port, and the maintenance of its vacuum degree requires the assistance of other structures (such as a diaphragm is arranged outside the air extraction port) to achieve, resulting in a large number of parts of the entire suction cup device, troublesome assembly, and the need to specifically mold to produce the diaphragm, with a low degree of integration. Content of the Utility Model

[0003] Based on the above problems, the purpose of the utility model is to provide an air extraction type one-way suction cup that is suitable for adsorption and fixation of various storage racks, has a reliable structure, and can be directly integrally formed during injection molding or injection to have a self-contained one-way cut-off function.

[0004] In view of the above problems, the following technical solution is provided: an air extraction type one-way suction cup, including a disk body, a cup opening is arranged at the bottom of the disk body, the cup opening is concave in a bowl shape and the wall thickness near the outer edge gradually decreases, an installation part and a differential pressure pipe are arranged at the top of the disk body, a differential pressure channel communicated with the inner cavity of the cup opening is arranged in the differential pressure pipe, the differential pressure pipe is arranged to extend out based on the connection with the disk body so as to form a compression section at the pipe wall position, and a closing seam connected with the differential pressure channel is arranged at one end of the differential pressure pipe facing away from the bottom of the disk body; an air chamber and a disk cover are further arranged at the top of the disk body, one end of the air chamber is communicated with the differential pressure pipe, a one-way piston is arranged in the air chamber, a pressing part extending out of the disk cover is connected to one end of the one-way piston facing away from the differential pressure pipe, and a pressure maintaining spring for pushing the one-way piston to move towards the top of the disk cover to make the pressing part protrude is further arranged in the air chamber; when the pressure maintaining spring pushes the one-way piston to move towards the top of the disk cover, a negative pressure is formed between the one-way piston and the differential pressure pipe, and the internal pressure in the differential pressure channel pushes the compression section to expand to separate the closing seam wall so as to extract the air in the cup opening; when the pressing part is pressed, the one-way piston approaches the differential pressure pipe and compresses the pressure maintaining spring, and at the same time, the pressure between the differential pressure pipe and the one-way piston increases to compress the compression section to close the closing seam, and the air between the one-way piston and the differential pressure pipe is discharged through the gap between the one-way piston and the air chamber.

[0005] In the above structure, the wall thickness at the outer edge of the suction port gradually decreases, which can improve the fitting effect at the outer edge. At the same time, the support strength can be gradually increased at positions far from the outer edge to ensure the stability of the suction cup. Both the disk body and the differential pressure tube are made of rubber material and are directly integrally formed in the mold during production, and a closed seam is constructed or generated by cutting in the later stage. When evacuating air, the pressing member is reciprocally pressed. When pressing down, the pressure maintaining spring is compressed, and the one-way piston approaches the differential pressure tube. The pressure at the rear end of the air chamber (that is, the pressure between the one-way piston and the differential pressure tube is greater than the pressure inside the suction port). At this time, the outer wall of the compressed section of the differential pressure tube is pressed to produce a close effect, which prompts the closed seam to remain closed, and the excess air is discharged from the gap between the one-way piston and the air chamber. When releasing the hand, the pressure maintaining spring pushes the one-way piston away from the differential pressure tube. At this time, the pressure at the rear end of the air chamber (that is, the pressure between the one-way piston and the differential pressure tube is less than the pressure inside the suction port). At this time, the compressed section of the differential pressure tube is separated from each other under the positive pressure effect of the differential pressure channel, which prompts the closed seam to open, and the air inside the suction port enters the air chamber to prepare for exhausting air in the next pressing. In this way, the air evacuation action is realized reciprocally. The sealing lip of the one-way piston is in a horn shape, and its lip opening faces away from the differential pressure tube, so the purpose of one-way air extraction is achieved. When the air inside the suction port is gradually exhausted, affected by the negative pressure, the one-way piston will resist the elastic force of the pressure maintaining spring to limit the ejection of the pressing member, so as to achieve the negative pressure holding effect.

[0006] The present utility model is further arranged such that a plurality of radial air guiding grooves are provided on the inner wall of the suction port, which are radially opened from the center of the suction port towards the position close to the outer edge of the suction port; a circumferential air guiding groove is further provided on the inner wall of the suction port, which is concentrically arranged with the center of the suction port, is opened along its circumferential direction and is connected to each radial air guiding groove. When there are multiple circumferential air guiding grooves, they are offset from each other; the differential pressure tube is located at the center position of the disk body.

[0007] In the above structure, the radial air guiding grooves and the circumferential air guiding grooves can guide the air on the inner wall of the suction port and discharge it from the differential pressure channel inside the differential pressure tube, avoiding the formation of local air cavities between the inner wall of the suction port and the surface of the adsorbed object to cause air entrapment and improving the exhausting effect.

[0008] The present utility model is further arranged such that the aspect ratio of the length to the width of the cross section of the differential pressure tube is 2 to 20:1, and the opening direction of the closed seam is the same as the long direction of the cross section of the differential pressure tube; the cross section of the differential pressure channel is offset from the cross section of the differential pressure tube.

[0009] In the above structure, the aspect ratio of the length to the width of the cross section of the differential pressure tube is preferably 4:1. Due to the difference in the aspect ratio, the deformation of the compressed section in the width direction of the differential pressure tube is smoother under the differential pressure action.

[0010] The present utility model is further arranged such that a sealing ring is provided on the surface of the outer edge of the suction port facing away from the top of the disk body. When there are multiple sealing rings, they are offset from each other.

[0011] In the above structure, the airtightness with the surface of the adsorbed object is improved.

[0012] The utility model is further configured such that a lug is provided at the position of the side wall of the outer edge of the socket opening.

[0013] In the above structure, after adsorption, the outer edge of the socket opening can be lifted through the lug to allow air to enter the socket opening, thereby removing the suction cup.

[0014] The utility model is further configured such that the disc body is further provided with a pressure relief hole located inside the socket opening and penetrating through its bottom and top; or a plug hole with an inner diameter larger than that of the pressure relief hole is provided at one end of the pressure relief hole facing the socket opening; one end of the pressure relief hole facing the inside of the socket opening is opened through a radial air guide groove and / or a circumferential air guide groove.

[0015] In the above structure, the connection between the pressure relief hole and the radial air guide groove and / or the circumferential air guide groove is conducive to quickly distributing air to the entire socket opening, avoiding the difficulty of removing the suction cup due to the existence of local negative pressure parts between the inner wall of the socket opening and the surface of the adsorbed object.

[0016] The utility model is further configured such that when a plug hole is provided at one end of the pressure relief hole facing the socket opening, a pressure relief rod is provided in the pressure relief hole, a sealing head adapted to the plug hole is provided at one end of the pressure relief rod facing the socket opening, a pressure relief button is provided at the other end of the pressure relief rod and passes through and exposes outside the disc cover, and a pressure relief spring for pushing the pressure relief rod to expose the pressure relief button and at the same time making the sealing head abut against the end face at the junction of the pressure relief hole and the plug hole to achieve sealing is sleeved on the pressure relief rod.

[0017] In the above structure, one end of the pressure relief spring abuts against the pressure relief button, and the other end abuts against the supporting part outside the air chamber (the pressure maintaining spring abuts against the end face of the necking at the end of the air chamber), the sealing head abuts against the end face at the junction of the pressure relief hole and the plug hole under the elastic force of the pressure relief spring to achieve sealing. When it is necessary to remove the suction cup, just press the pressure relief button to make the sealing head release and allow air to enter the socket opening.

[0018] The utility model is further configured such that the installation part is an installation bracket located at the top of the disc body and embedded in the disc body, and installation holes are provided on the installation bracket; the air chamber and the disc cover are connected to the installation bracket by screws.

[0019] In the above structure, the installation bracket is made of plastic or metal, and the installation bracket is integrally embedded directly when the disc body is injected with glue or molded; embedded nuts are provided in the installation holes, the screws are connected to the embedded nuts, and the disc cover presses the air chamber onto the disc body when fixed; the screws can also pass through other parts to be fixed and fix them on the suction cup.

[0020] The utility model is further configured such that a warning ring is provided on the outer side wall of the pressing member.

[0021] In the above structure, the warning ring is located at the middle position of the pressing stroke of the pressing member, and is used to indicate the negative pressure state inside the socket opening. If the warning ring is exposed, it means that the socket opening needs to be evacuated again.

[0022] The utility model is further configured such that a support cover is provided at one end of the disk cover facing the disk opening, and when the disk opening is adsorbed, the end face of the support cover abuts against the outer edge of the back end of the disk body facing away from the disk opening or is located outside the disk opening and abuts against the surface of the adsorbed object.

[0023] In the above structure, when the disk opening adsorbs to the surface of the adsorbed object, its outer diameter will expand, and at the same time, the height of the disk body decreases, prompting the support cover to abut against the outer edge of the disk opening to enhance the adsorption force and stability; or directly abut against the surface of the adsorbed object. When the support cover directly abuts against the surface of the adsorbed object, an ear groove for the pull tab to pass through is provided on the end face of the support cover.

[0024] The beneficial effects of the utility model are as follows: The wall thickness near the outer edge of the disk opening gradually thins, which can improve the fitting effect at the outer edge, and at the same time, the support strength can be gradually increased at positions away from the outer edge to ensure the stability of the suction cup; both the disk body and the differential pressure tube are made of rubber material, and are directly integrally formed in the mold during production, and at the same time, a closed seam is constructed or generated by cutting in the later stage; when pumping air, the pressing member is reciprocally pressed. When pressing down, the pressure maintaining spring is compressed, the one-way piston approaches the differential pressure tube, and the pressure at the rear end of the air chamber (that is, the pressure between the one-way piston and the differential pressure tube is greater than the pressure inside the disk opening). At this time, the outer wall of the compressed section of the differential pressure tube is pressed to produce a close effect, prompting the closed seam to remain closed, and the excess air is discharged from the gap between the one-way piston and the air chamber; when releasing the hand, the pressure maintaining spring pushes the one-way piston away from the differential pressure tube. At this time, the pressure at the rear end of the air chamber (that is, the pressure between the one-way piston and the differential pressure tube is less than the pressure inside the disk opening). At this time, the compressed section of the differential pressure tube is separated from each other under the positive pressure effect of the differential pressure channel, prompting the closed seam to open, and the air inside the disk opening enters the air chamber to prepare for exhausting air for the next pressing. In this way, the air pumping action is realized reciprocally; the sealing lip of the one-way piston is in a horn shape, and its lip opening faces away from the differential pressure tube, so the purpose of one-way air pumping is achieved; when the air inside the disk opening is gradually exhausted, affected by the negative pressure, the one-way piston will resist the elastic force of the pressure maintaining spring to limit the ejection of the pressing member, thereby realizing the negative pressure pressure maintaining effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic perspective view of the overall structure of the utility model.

[0026] Figure 2 It is a schematic perspective view of the first full-section structure of the utility model.

[0027] Figure 3 It is a schematic perspective view of the second full-section structure of the utility model.

[0028] Figure 4 It is an exploded structure schematic diagram of the utility model.

[0029] Figure 5 It is a schematic perspective view of the overall structure of the disk body of the utility model.

[0030] Figure 6 This is the first fully-sectioned three-dimensional structure schematic diagram of the disk body of the present utility model.

[0031] Figure 7 This is the second fully-sectioned three-dimensional structure schematic diagram of the disk body of the present utility model.

[0032] Figure 8 This is the first exploded three-dimensional structure schematic diagram of the disk body of the present utility model.

[0033] Figure 9 This is the second exploded three-dimensional structure schematic diagram of the disk body of the present utility model.

[0034] The meanings of the reference numerals in the figure: 10 - disk body; 11 - disk opening; 111 - radial air guide groove; 112 - circumferential air guide groove; 113 - sealing ring; 114 - pull tab; 12 - mounting part; 13 - differential pressure pipe; 131 - differential pressure channel; 132 - closing seam; 133 - compression section; 14 - pressure relief hole; 141 - plug hole; 15 - mounting bracket; 151 - mounting hole; 152 - embedded nut; 16 - screw; 20 - air chamber; 201 - support part; 202 - necking; 21 - one-way piston; 211 - sealing lip; 22 - pressing part; 221 - warning ring; 23 - pressure maintaining spring; 30 - disk cover; 31 - support cover; 311 - ear groove; 40 - pressure relief rod; 401 - plugging head; 41 - pressure relief button; 42 - pressure relief spring. Specific embodiments

[0035] The following will further describe in detail the specific embodiments of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0036] Reference Figures 1 to 9 As Figures 1 to 9An air extraction type one-way suction cup shown in the figure includes a disk body 10. A disk opening 11 is provided at the bottom of the disk body 10. The disk opening 11 is concave and bowl-shaped, and the wall thickness near the outer edge gradually thins. An installation part 12 and a differential pressure pipe 13 are provided at the top of the disk body 10. A differential pressure passage 131 communicating with the inner cavity of the disk opening 11 is provided in the differential pressure pipe 13. The differential pressure pipe 13 is arranged to extend outward at the connection with the disk body 10, so that a compression section 133 is formed at the pipe wall position. A closing seam 132 connected to the differential pressure passage 131 is provided at one end of the differential pressure pipe 13 facing away from the bottom of the disk body 10. It also includes an air chamber 20 and a disk cover 30 located at the top of the disk body 10. One end of the air chamber 20 is communicated with the differential pressure pipe 13. A one-way piston 21 is provided in the air chamber 20. A pressing member 22 extending out of the disk cover 30 is connected to one end of the one-way piston 21 facing away from the differential pressure pipe 13. A pressure maintaining spring 23 for pushing the one-way piston 21 to move towards the top of the disk cover 30 to make the pressing member 22 protrude is also provided in the air chamber 20. When the pressure maintaining spring 23 pushes the one-way piston 21 to move towards the top of the disk cover 30, a negative pressure is formed between the one-way piston 21 and the differential pressure pipe 13, so that the internal pressure in the differential pressure passage 131 pushes the compression section 133 to expand, and the closing seam 132 is separated from the wall to extract the air in the disk opening 11. When the pressing member 22 is pressed, the one-way piston 21 approaches the differential pressure pipe 13 and compresses the pressure maintaining spring 23. At the same time, the pressure between the differential pressure pipe 13 and the one-way piston 21 increases, so that the compression section 133 is compressed and the closing seam 132 is closed. The air between the one-way piston 21 and the differential pressure pipe 13 is discharged through the gap between the one-way piston 21 and the air chamber 20.

[0037] In the above structure, the wall thickness of the mouth 11 gradually decreases near the outer edge, which can improve the fitting effect at the outer edge, and at the same time gradually increase the support strength at positions far from the outer edge to ensure the stability of the suction cup; both the disk body 10 and the differential pressure tube 13 are made of rubber and are directly integrally formed in the mold during production, and the closed seam 132 is constructed or generated by cutting in the later stage; when the pressing member 22 is reciprocally pressed during air extraction, when pressing down, the pressure maintaining spring 23 is compressed, the one-way piston 21 approaches the differential pressure tube 13, and the pressure at the rear end of the air chamber 20 (that is, the pressure between the one-way piston 21 and the differential pressure tube 13 is greater than the pressure inside the mouth 11). At this time, the outer wall of the compression section 133 of the differential pressure tube 13 is pressed to produce an approaching effect, which prompts the closed seam 132 to remain closed, and the excess air is discharged from the gap between the one-way piston 21 and the air chamber 20; when releasing the hand, the pressure maintaining spring 23 pushes the one-way piston 21 away from the differential pressure tube 13. At this time, the pressure at the rear end of the air chamber 20 (that is, the pressure between the one-way piston 21 and the differential pressure tube 13 is less than the pressure inside the mouth 11). At this time, the compression section 133 of the differential pressure tube 13 is pushed away from each other by the positive pressure effect of the differential pressure channel 131, which prompts the closed seam 132 to open, and the air inside the mouth 11 enters the air chamber 20 to prepare for exhausting in the next pressing. In this way, the air extraction action is realized reciprocally; the sealing lip 211 of the one-way piston 21 is in a trumpet shape, and its lip opening faces away from the differential pressure tube 13, so the purpose of one-way air extraction is realized; when the air inside the mouth 11 is gradually exhausted, affected by the negative pressure, the one-way piston 21 will resist the elastic force of the pressure maintaining spring 23 to limit the ejection of the pressing member 22, so as to realize the negative pressure pressure maintaining effect.

[0038] In this embodiment, a plurality of radial air guiding grooves 111 are provided on the inner wall of the mouth 11, which are radially opened from the center of the mouth 11 towards the position near the outer edge of the mouth 11; a circumferential air guiding groove 112 is also provided on the inner wall of the mouth 11, which is concentric with the center of the mouth 11, is opened along its circumferential direction and is connected to each radial air guiding groove 111. When there are multiple circumferential air guiding grooves 112, they are offset from each other; the differential pressure tube 13 is located at the center of the disk body 10.

[0039] In the above structure, the radial air guiding grooves 111 and the circumferential air guiding grooves 112 can guide the air on the inner wall of the mouth 11 and discharge it from the differential pressure channel 131 inside the differential pressure tube 13, avoiding the formation of local air cavities between the inner wall of the mouth 11 and the surface of the adsorbed object to cause air entrapment and improving the exhausting effect.

[0040] In this embodiment, the aspect ratio of the length to the width of the cross section of the differential pressure tube 13 is 2 - 20:1, the opening direction of the closed seam 132 is the same as the long side direction of the cross section of the differential pressure tube 13; the cross section of the differential pressure channel 131 is offset from the cross section of the differential pressure tube 13.

[0041] In the above structure, the aspect ratio of the length to the width of the cross section of the differential pressure tube 13 is preferably 4:1. Due to the difference in the aspect ratio, the deformation of the compression section 133 in the width direction of the differential pressure tube 13 is smoother under the differential pressure action.

[0042] In this embodiment, a sealing ring 113 is provided on the side of the outer edge of the socket 11 facing away from the top of the disk body 10, and when there are multiple sealing rings 113, they are offset from each other.

[0043] In the above structure, the airtightness with the surface of the adsorbed object is improved.

[0044] In this embodiment, a lug 114 is provided at the side wall position of the outer edge of the socket 11.

[0045] In the above structure, after adsorption, the outer edge of the socket 11 can be lifted through the lug 114 to allow air to enter the socket 11, so as to remove the suction cup.

[0046] In this embodiment, the disk body 10 is further provided with a pressure relief hole 14 located inside the socket 11 and penetrating through its bottom and top; or a plug hole 141 with an inner diameter larger than that of the pressure relief hole 14 is provided at one end of the pressure relief hole 14 facing the socket 11; one end of the pressure relief hole 14 facing the inside of the socket 11 is opened through a radial air guide groove 111 and / or a circumferential air guide groove 112.

[0047] In the above structure, the connection between the pressure relief hole 14 and the radial air guide groove 111 and / or the circumferential air guide groove 112 is beneficial to quickly distribute air to the entire socket 11, avoiding the difficulty of removing the suction cup due to the existence of local negative pressure parts between the inner wall of the socket 11 and the surface of the adsorbed object.

[0048] In this embodiment, when a plug hole 141 is provided at one end of the pressure relief hole 14 facing the socket 11, a pressure relief rod 40 is provided in the pressure relief hole 14. A plug head 401 adapted to the plug hole 141 is provided at one end of the pressure relief rod 40 facing the socket 11. A pressure relief button 41 is provided at the other end of the pressure relief rod 40 and passes through the disk cover 30 and is exposed outside the disk cover 30. A pressure relief spring 42 for pushing the pressure relief rod 40 to expose the pressure relief button 41 while making the plug head 401 abut against the end face at the junction of the pressure relief hole 14 and the plug hole 141 to achieve sealing is sleeved on the pressure relief rod 40.

[0049] In the above structure, one end of the pressure relief spring 42 abuts against the pressure relief button 41, and the other end abuts against the supporting part 201 outside the air chamber 20 (the pressure maintaining spring 23 abuts against the end face of the necking 202 at the end of the air chamber 20). The plug head 401 abuts against the end face at the junction of the pressure relief hole 14 and the plug hole 141 under the elastic force of the pressure relief spring 42 to achieve sealing. When it is necessary to remove the suction cup, just press the pressure relief button 41 to make the plug head 401 disengage and allow air to enter the socket 11.

[0050] In this embodiment, the mounting part 12 is a mounting bracket 15 located at the top of the disk body 10 and embedded in the disk body 10. Mounting holes 151 are provided on the mounting bracket 15; the air chamber 20 and the disk cover 30 are connected to the mounting bracket 15 through screws 16.

[0051] In the above structure, the mounting bracket 15 is made of plastic or metal. During glue injection or injection molding of the disk body 10, the mounting bracket 15 is integrally embedded therein directly. A buried nut 152 is provided in the mounting hole 151, and the screw 16 is connected to the buried nut 152. When the disk cover 30 is fixed, the air chamber 20 is pressed onto the disk body 10. The screw 16 can also pass through other parts to be fixed and fix them on the suction cup.

[0052] In this embodiment, a warning ring 221 is provided on the outer side wall of the pressing member 22.

[0053] In the above structure, the warning ring 221 is located at the middle position of the pressing stroke of the pressing member 22 and is used to indicate the negative pressure state in the disk opening 11. If the warning ring 221 is exposed, it means that the disk opening 11 needs to be evacuated again.

[0054] In this embodiment, a support cover 31 is provided at one end of the disk cover 30 facing the disk opening 11. When the disk opening 11 adsorbs, the end face of the support cover 31 abuts against the outer edge of the end of the disk body 10 facing away from the disk opening 11 or is located outside the disk opening 11 and abuts against the surface of the object to be adsorbed.

[0055] In the above structure, when the disk opening 11 adsorbs to the surface of the object to be adsorbed, its outer diameter will expand. At the same time, the height of the disk body 10 decreases, prompting the support cover 31 to abut against the outer edge of the disk opening 11 to enhance the adsorption force and stability; or directly abut against the surface of the object to be adsorbed. When the support cover 31 directly abuts against the surface of the object to be adsorbed, an ear slot 311 for the pull tab 114 to pass through is provided on the end face of the support cover 31.

[0056] Advantages of the present utility model: The wall thickness of the disk opening 11 gradually thins near the outer edge, which can improve the fitting effect at the outer edge, and at the same time, the support strength can be gradually increased at positions away from the outer edge to ensure the stability of the suction cup; both the disk body 10 and the differential pressure tube 13 are made of rubber and are directly integrally formed in the mold during production, and the closed seam 132 is constructed or generated by cutting in the later stage; when pumping air, the pressing member 22 is reciprocally pressed. When pressing down, the pressure maintaining spring 23 is compressed, and the one-way piston 21 approaches the differential pressure tube 13. The pressure at the rear end of the air chamber 20 (that is, the pressure between the one-way piston 21 and the differential pressure tube 13 is greater than the pressure inside the disk opening 11). At this time, the outer wall of the compression section 133 of the differential pressure tube 13 is pressed to produce a close effect, which causes the closed seam 132 to remain closed, and the excess air is discharged from the gap between the one-way piston 21 and the air chamber 20; when releasing the hand, the pressure maintaining spring 23 pushes the one-way piston 21 away from the differential pressure tube 13. At this time, the pressure at the rear end of the air chamber 20 (that is, the pressure between the one-way piston 21 and the differential pressure tube 13 is less than the pressure inside the disk opening 11). At this time, the compression sections 133 of the differential pressure tube 13 are separated from each other under the positive pressure effect of the differential pressure passage 131, which causes the closed seam 132 to open, and the air inside the disk opening 11 enters the air chamber 20 to prepare for exhausting air for the next pressing. In this way, the pumping action is realized reciprocally; the sealing lip 211 of the one-way piston 21 is in a horn shape, and its lip opening faces away from the differential pressure tube 13, so the purpose of one-way air pumping is achieved; when the air inside the disk opening 11 is gradually exhausted, affected by the negative pressure, the one-way piston 21 will resist the elastic force of the pressure maintaining spring 23 to limit the ejection of the pressing member 22, thereby realizing the negative pressure pressure maintaining effect.

[0057] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and modifications can still be made. These improvements and modifications made under the above assumptions should also be regarded as the protection scope of the present utility model.

Claims

1. A suction - type one - way suction cup, comprising a disc body (10), a disc opening (11) is provided at the bottom of the disc body (10), the disc opening (11) is concave, and it is characterized in that: The top of the disk body (10) is provided with an installation part (12) and a differential pressure pipe (13). A differential pressure channel (131) communicating with the inner cavity of the disk opening (11) is arranged in the differential pressure pipe (13). The differential pressure pipe (13) is arranged to protrude at the connection with the disk body (10), so that a compression section (133) is formed at the pipe wall position. One end of the differential pressure pipe (13) facing away from the bottom of the disk body (10) is provided with a closed seam (132) connected to the differential pressure channel (131). It also includes an air chamber (20) and a disk cover (30) located at the top of the disk body (10). One end of the air chamber (20) is communicated with the differential pressure pipe (13). A one-way piston (21) is arranged in the air chamber (20). One end of the one-way piston (21) facing away from the differential pressure pipe (13) is connected with a pressing part (22) protruding out of the disk cover (30). A pressure maintaining spring (23) for pushing the one-way piston (21) to move towards the top of the disk cover (30) to make the pressing part (22) protrude is also arranged in the air chamber (20). When the pressure maintaining spring (23) pushes the one-way piston (21) to move towards the top of the disk cover (30), a negative pressure is formed between the one-way piston (21) and the differential pressure pipe (13), so that the internal pressure in the differential pressure channel (131) pushes the compression section (133) to expand and the walls of the closed seam (132) are separated, thereby pumping out the air in the disk opening (11). When the pressing part (22) is pressed, the one-way piston (21) approaches the differential pressure pipe (13) and compresses the pressure maintaining spring (23). At the same time, the pressure between the differential pressure pipe (13) and the one-way piston (21) increases, so that the compression section (133) is compressed and the closed seam (132) is closed. The air between the one-way piston (21) and the differential pressure pipe (13) is discharged through the gap between the one-way piston (21) and the air chamber (20).

2. The air extraction type one-way suction cup according to claim 1, characterized in that: A plurality of radial air guiding grooves (111) radially arranged from the center of the disk opening (11) towards the outer edge of the disk opening (11) are arranged on the inner wall of the disk opening (11). The inner wall of the disk opening (11) is also provided with a circumferential air guiding groove (112) concentric with the center of the disk opening (11), which is arranged along the circumferential direction and connected to each radial air guiding groove (111). When there are multiple circumferential air guiding grooves (112), they are offset from each other. The differential pressure pipe (13) is located at the center of the disk body (10).

3. The air extraction type one-way suction cup according to claim 1 or 2, characterized in that: The aspect ratio of the length to the width of the cross-section of the differential pressure pipe (13) is 2 - 20:

1. The opening direction of the closed seam (132) is the same as the long direction of the cross-section of the differential pressure pipe (13). The cross-section of the differential pressure channel (131) is offset from the cross-section of the differential pressure pipe (13).

4. The air-extracting one-way suction cup according to claim 1, characterized in that: A sealing ring (113) is arranged on one side of the outer edge of the disk opening (11) facing away from the top of the disk body (10). When there are multiple sealing rings (113), they are offset from each other.

5. The air extraction type one-way suction cup according to claim 2, characterized in that: The disk body (10) is also provided with a pressure relief hole (14) located in the disk opening (11) and penetrating through its bottom and top; or a plug hole (141) with an inner diameter larger than that of the pressure relief hole (14) is arranged at one end of the pressure relief hole (14) facing the disk opening (11). One end of the pressure relief hole (14) facing the disk opening (11) is opened through the radial air guiding groove (111) and / or the circumferential air guiding groove (112).

6. The air extraction type one-way suction cup according to claim 5, wherein: When a plug hole (141) is provided at one end of the pressure relief hole (14) facing the plate opening (11), a pressure relief rod (40) is provided in the pressure relief hole (14). A plugging head (401) adapted to the plug hole (141) is provided at one end of the pressure relief rod (40) facing the plate opening (11). A pressure relief button (41) is provided at the other end of the pressure relief rod (40) and penetrates through and protrudes out of the plate cover (30). A pressure relief spring (42) is sleeved on the pressure relief rod (40) for pushing the pressure relief rod (40) to expose the pressure relief button (41) while making the plugging head (401) abut against the end face at the junction of the pressure relief hole (14) and the plug hole (141) to achieve sealing.

7. The air extraction type one-way suction cup according to claim 1, characterized in that: Lug ears (114) are provided at the outer edge side wall position of the plate opening (11).

8. The air extraction type one-way suction cup according to claim 1, characterized in that: The installation part (12) is an installation bracket (15) located at the top of the plate body (10) and embedded in the plate body (10). Installation holes (151) are provided on the installation bracket (15); the air chamber (20) and the plate cover (30) are connected to the installation bracket (15) by screws (16).

9. The air-extracting one-way suction cup according to claim 1, characterized in that: A warning ring (221) is provided on the outer side wall of the pressing member (22).

10. The air-extracting one-way suction cup according to claim 1, characterized in that: A support cover (31) is provided at one end of the plate cover (30) facing the plate opening (11). When the plate opening (11) is adsorbed, the end face of the support cover (31) abuts against the outer edge of the end of the plate body (10) facing away from the plate opening (11) or is located outside the plate opening (11) and abuts against the surface of the adsorbed object.

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