CN210823536U - A spring external lotion pump - Google Patents

Abstract

The utility model discloses an external spring lotion pump, which comprises a pressure head, a connecting pipe, a piston and a cylindrical pump body, wherein the piston is arranged in the inner cavity of the pump body, the pressure head is connected with the piston through the connecting pipe, a first discharging channel communicated with the connecting pipe and the inner cavity is arranged in the piston, and a second discharging channel communicated with the connecting pipe is arranged in the pressure head; a return spring is arranged between the pressure head and the pump body, and the lower part of the inner cavity is connected with a suction pipe; the inner side of the upper part of the connecting pipe and the lower part of the inner cavity are both provided with an isolation mechanism, and the isolation mechanism comprises a plug and an elastic supporting piece of which one end is connected with the plug; a first isolation plate is arranged on the inner side of the upper part of the connecting pipe, a fourth through hole is formed in the middle of the first isolation plate, and the fourth through hole is sealed by a plug from the upper side under the action of the elastic supporting piece so as to isolate the upper cavity and the lower cavity of the connecting pipe; first through-hole has been seted up to the bottom of the junction of inner chamber and straw, and under elastic support's effect, the end cap seals first through-hole in order to keep apart inner chamber and straw from the upside.

Description

A spring external lotion pump

technical field

The utility model relates to the technical field of lotion pumps, in particular to an external spring lotion pump.

Background technique

The spring external lotion pump is often used to pump out shampoo, hand sanitizer, detergent and other lotion-like daily chemicals. It is very convenient to use. The lotion pump mainly includes pressure head, connecting pipe, piston, pump body, etc., connecting pipe, piston It is placed in the pump body, the upper end of the connecting pipe is connected with the pressure head, and the lower end is connected with the piston. Both the pressure head and the piston are provided with a discharge channel that communicates with the inner cavity of the connecting pipe, and a return spring is arranged between the pressure head and the pump body. The upper part of the body is provided with a screw cap connected to the bottle body, and the lower part of the pump body is connected with a suction pipe, which is connected to the inner cavity of the connecting pipe. Tube and discharge channel flow out. The connection between the pump body cavity and the suction pipe of the existing spring external lotion pump is provided with steel balls or glass beads. When not in use, the self-gravity of the steel balls or glass beads is used to realize the sealing isolation between the pump body cavity and the suction pipe. Once the bottle body is tilted or inverted, the steel or glass beads are easily dislocated, so that the suction tube is connected to the inner cavity of the pump body, and the emulsion will automatically flow out from the pressure head, causing waste. Therefore, it is necessary to improve and optimize the existing spring external lotion pump.

Utility model content

Aiming at the problems existing in the prior art, the utility model provides a spring external lotion pump. When the bottle body is tilted or inverted, it is difficult for the lotion to automatically flow out from the pressure head.

The technical scheme adopted by the utility model is:

A spring external lotion pump, comprising a pressure head, a connecting pipe, a piston and a cylindrical pump body, the piston is placed in the inner cavity of the pump body, the pressure head and the piston are connected through the connecting pipe, so the The piston is provided with a first discharge channel that communicates with the connecting pipe and the inner cavity, and the pressure head is provided with a second discharge channel that communicates with the connecting pipe; the pressure head is slidably connected to the The pump body, a return spring is arranged between the pressure head and the pump body, the lower part of the inner cavity is connected with a suction pipe; the upper inner side of the connecting pipe and the lower part of the inner cavity are provided with an isolation mechanism, The isolation mechanism includes a plug and an elastic support, one end of the elastic support is connected to the plug, and the other end is connected to the connecting pipe and the inner cavity; the upper inner side of the connecting pipe is provided with a first isolation A fourth through hole is opened in the middle of the first isolation plate. Under the action of the elastic support, the plug seals the fourth through hole from the upper side to isolate the upper and lower parts of the connecting pipe. A cavity; a first through hole is opened at the bottom end of the connection between the inner cavity and the suction tube, and under the action of the elastic support, the plug seals the first through hole from the upper side to isolate the inner cavity cavity and pipette.

Further, the isolation mechanism further includes a cylindrical isolation block, one end of the elastic support member is connected to the plug, and the other end is connected to the cylindrical isolation block.

Further, a second through hole is formed in the middle of the cylindrical spacer block, the elastic support is a plurality of supporting elastic sheets staggered and staggered from the second through hole, and one end of the supporting elastic sheet is connected to the plug. , and the other end is connected to the cylindrical isolation block.

Further, a first outer buckle convex ring is arranged on the outer side of the lower part of the connecting pipe, the outer side of the middle part of the piston extends upward into an annular first outer extension part, and the inner wall of the first outer extension part is provided with a first outer buckle. The first inner snap-fit concave ring matched with the convex ring.

Preferably, the top end of the first extension portion is turned outward to form an annular fifth extension portion, and the outer wall of the fifth extension portion is provided with a first sealing ring matching the inner diameter of the middle portion of the inner cavity.

Further, the first discharge channel is arranged in the middle part along the axial direction of the piston, and the lower part of the piston is provided with a third through hole along the radial side of the piston, and the third through hole communicates with each other. the inner cavity and the first discharge channel.

Further, the pressure head is provided with an inserting part that can be inserted into the connecting pipe, the outer side of the inserting part is provided with a second outer snap ring, and the upper cavity of the connecting pipe is provided with the second outer ring. The outer snap ring is matched with the second inner snap ring.

Further, the second discharging channel is arranged in the inserting part and extends out of the discharging port to one side.

Further, the top of the connecting pipe is turned outward to form an annular second extension, the top of the screw cap is provided with a groove, and the bottom of the groove extends upward to form a first inner cylinder with an opening at the upper end. The connecting pipe passes through the first inner cylinder, the return spring is sleeved on the outside of the connecting pipe, one end of the return spring abuts the second extension portion, and the other end abuts the groove.

Further, a third outer buckling convex ring is provided on the outer side of the upper part of the pump body, an annular third extension part is turned outwards on the upper part of the screw cover, and the inner wall of the third extension part is provided with the third outer extension part. The three outer snap rings match the third inner snap ring.

The beneficial effects of the above technical solutions are: using the spring external lotion pump in the above technical solutions, the plug mainly relies on the supporting force of the elastic support to block the first through hole and the fourth through hole, instead of relying on its own gravity, Once the bottle body is tilted or inverted, the plug will not easily dislocate under the support force of the elastic support, the discharge channel is still blocked, and it is difficult for the emulsion to flow out of the pressure head automatically.

Description of drawings

1 is a cross-sectional view of the overall structure of the indenter in the embodiment of the present invention when it is at the lowest position;

2 is a cross-sectional view of the overall structure of the indenter at the highest position in the embodiment of the present utility model;

3 is a cross-sectional view of the isolation mechanism in the embodiment of the present invention;

4 is a cross-sectional view of an indenter in an embodiment of the present invention;

5 is a cross-sectional view of a connecting pipe in an embodiment of the present invention;

6 is a cross-sectional view of a screw cap in an embodiment of the present invention;

7 is a cross-sectional view of the pump body in the embodiment of the present invention;

8 is a cross-sectional view of the piston in the embodiment of the present invention.

Detailed ways

This part will describe the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. Understand each technical feature and overall technical solution of the present invention, but it should not be construed as a limitation on the protection scope of the present invention.

In the description of the present utility model, it should be understood that the orientation descriptions related to orientations, such as up, down, front, rear, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings, only It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution .

The structure of a ball-rolling bottle preform and a mold for manufacturing the preform of the present invention will be described in detail below with reference to the preferred examples and the accompanying drawings.

1 and 2, a spring external lotion pump is provided in the embodiment of the present invention, and the overall structure is as follows:

Including the pressure head 100, the connecting pipe 200, the piston 500 and the cylindrical pump body 400, the piston 500 is placed in the inner cavity 406 of the pump body 400, the pressure head 100 and the piston 500 are connected through the connecting pipe 200, and the piston 500 is provided with a communication connection The first discharge channel 502 of the tube 200 and the inner cavity 406, the pressure head 100 is provided with a second discharge channel 104 that communicates with the connecting pipe 200; the pressure head 100 is slidably connected to the pump body 400, the pressure head 100 and the pump body 400 A return spring 800 for resetting the pressure head 100 is arranged between, the upper part of the pump body 400 is provided with a screw cap 300 connected with the bottle body, and the lower part of the inner cavity 406 is connected with a suction pipe 700, which is used for inhaling the emulsion in the bottle body; the inner cavity The lower part of 406 is provided with an isolation mechanism 600, the isolation mechanism 600 includes a plug 602 and an elastic support 603, one end of the elastic support 603 is connected to the plug 602, and the other end is connected to the inner cavity 406; the lower end of the inner cavity 406 is connected to the suction tube 700 There is an inverted conical first through hole 4032 , and under the action of the elastic support 603 , the plug 602 seals the first through hole 4032 from the upper side to isolate the inner cavity 406 and the suction tube 700 . The upper inner side of the connecting pipe 200 is also provided with an isolation mechanism 600, one end of the elastic support 603 is connected to the plug 602, and the other end is connected to the connecting pipe 200; the upper inner side of the connecting pipe 200 is provided with a first isolation plate 204, which is A fourth through hole 2041 is opened in the middle. Under the action of the elastic support member 603 , the plug 602 seals the fourth through hole 2041 from the upper side to isolate the upper and lower cavities of the connecting pipe 200 .

The specific structure is as follows:

Referring to FIG. 3 , the isolation mechanism 600 includes a cylindrical isolation block 604 , an elastic support 603 and a plug 602 . A second through hole 605 is opened in the middle of the cylindrical isolation block 604 , and a first limit is provided outside the cylindrical isolation block 604 . Position convex ring 601 ; in this embodiment, the elastic support member 603 is a plurality of supporting elastic sheets staggered and staggered from the second through hole 605 , one end of the supporting elastic sheet is connected to the plug 602 , and the other end is connected to the cylindrical spacer 604 .

Referring to FIG. 4 , the indenter 100 is provided with an inserting portion 105 that can be inserted into the connecting pipe 200 , and two second outer snap rings 102 are juxtaposed on the outside of the inserting portion 105 ; the second discharging channel 104 It is arranged in the insertion part 105 and extends out of the discharge port 106 to one side; two vertical plates are also arranged in the indenter 100, and the vertical plates are placed on one side of the insertion part 105, and the space between the two vertical plates is The slot forms a slot 103 ; the inner wall of the lower part of the indenter 100 is provided with an inner screw thread 101 connected with the screw cap 300 .

Referring to FIG. 5 , the upper part of the inner cavity of the connection pipe 200 is provided with a first isolation plate 204 , and the middle of the first isolation plate 204 is provided with a fourth through hole 2041 connecting the upper and lower cavities of the connection pipe 200 , and the connection pipe 200 The inner wall of the upper cavity is provided with a second concave concave ring 203 . The first limiting convex ring 601 is embedded in the second limiting concave ring 203 to achieve edge sealing between the cylindrical spacer block 604 and the upper cavity of the connecting pipe 200; at the same time, the plug 602 contacts the fourth through hole 2041 for sealing to The upper and lower cavities of the connecting pipe 200 are isolated. The upper cavity of the connecting pipe 200 is provided with a second inner buckling concave ring 202 matching the second outer buckling convex ring 102 , the second inner buckling concave ring 202 is located on the upper part of the second limiting concave ring 203 , and the second outer buckling concave ring 202 The snap-fit convex ring 102 is embedded in the second inner snap-fit concave ring 202 to achieve a sealed connection between the inserting portion 105 and the connecting pipe 200 and prevent the emulsion from leaking from the connection between the two. The top of the connecting pipe 200 is also turned outward to form a second annular second extension portion 201 . The outer side of the lower part of the connecting pipe 200 is also provided with a first outer snap ring 205 connected with the piston 500 .

Referring to FIG. 6 , the top of the screw cap 300 is provided with a vertical groove 301 , and the bottom of the groove 301 extends upward to form a first inner cylinder 307 with an opening at the upper end. The height of the first inner cylinder 307 is smaller than that of the groove 301 . Height, the inner wall of the first inner cylinder 307 is provided with a second sealing ring 3071, the connecting pipe 200 passes through the first inner cylinder 307, and the second sealing ring 3071 realizes the sealing between the outer wall of the connecting pipe 200 and the first inner cylinder 307 . As shown in FIGS. 1 and 2 , the return spring 800 is sleeved on the outside of the connecting tube 200 , one end of the return spring 800 abuts the bottom of the second extension portion 201 , and the other end abuts the bottom of the groove 301 . An annular third extension portion 302 is formed on the upper portion of the screw cap 300 , and a third inner snap-fit concave ring 3021 is disposed on the inner wall of the third extension portion 302 . The upper part of the third extension part 302 is turned outward to form an annular fourth extension part 303 , the outer side of the fourth extension part 303 is provided with an external thread 3031 matching the internal thread 101 , and the screw thread is connected between the indenter 100 and the screw cap 300 . connect. A protrusion 305 is provided at the connection between the third extension portion 302 and the fourth extension portion 303 . The protrusion 305 matches the slot 103 on the indenter 100 , and the projection 305 is embedded in the slot to further ensure the indenter 100 and the screw cap 300 If the product purchased in the supermarket, the protrusion 305 on the screw cap 300 is not in the card slot 103, it means that the product has been opened. The fourth extension portion 303 extends downward to a first connecting portion 304 for connecting with the opening of the bottle body. The inner wall of the first connecting portion 304 is provided with a screw thread 3041, and the first connecting portion 304 and the bottle body are connected by threads. A plurality of connecting bars 306 are evenly distributed between the bottle bodies at the bottom end of the first connecting portion 304 , and the number of the connecting bars 306 can be adjusted according to actual use conditions to further strengthen the connection between the lotion pump and the bottle body.

Referring to FIG. 7 , the upper and middle sections of the inner cavity 406 of the pump body 400 are straight walls, and the diameter of the upper section is larger than the diameter of the middle section. The convex ring 401 is matched with the third inner buckle concave ring 3021 on the third extension part 302, the upper part of the pump body 400 is inserted into the screw cap 300, and the third outer buckle convex ring 401 is embedded in the third inner buckle concave ring 3021 to realize the pump Seal between the body 400 and the screw cap 300 . The upper outer side of the pump body 400 is circumferentially extended with a disc 402, the disc 402 extends downward out of an annular second connecting part 407, the outer diameter of the second connecting part 407 matches the outer diameter of the opening of the bottle body, and the second connection A third sealing ring 4071 is provided on the outer side of the part 407 to realize the sealing connection between the pump body 400 and the bottle body. The lower part of the inner cavity 406 of the pump body 400 is provided with a second isolation plate 405, the middle of the second isolation plate 405 extends downward to form a second inner cylinder 403, and the inner wall of the second inner cylinder 403 is provided with a first limiting concave ring 4031, the first limiting concave ring 4031 is matched with the first limiting convex ring 601 on the cylindrical isolation block 604, and the first limiting convex ring 601 is embedded in the first limiting concave ring 4031, so as to realize the cylindrical isolation block 604 and the first limiting concave ring 4031. The sealing between the second inner cylinders 403; the second inner cylinder 403 is inserted into the suction pipe 700 to realize the connection between the pump body 400 and the suction pipe 700; the middle of the bottom end of the second inner cylinder 403 is provided with an inverted conical first through hole 4032, The plug 602 closes the first through hole 4032 to isolate the second inner cylinder 403 and the suction tube 700, that is, to cut off the circulation channel of the emulsion.

Referring to FIG. 8 , the outer side of the middle portion of the piston 500 extends upward to form an annular first extension portion 503 . The inner wall of the first extension portion 503 is provided with a first inner snap-fitting concave ring 5031 , which is connected to the connecting pipe. The first outer snap ring 205 on the 200 is matched, the connecting pipe 200 is inserted into the first extension portion 503 , and the first outer snap ring 205 is embedded in the first inner snap ring 5031 to realize the connection between the connecting pipe 200 and the piston 500 sealed connection. The top of the first extension part 503 is turned outward to form an annular fifth extension part 501 , the outer wall of the fifth extension part 501 is provided with a first sealing ring 5011 , the diameter of the first sealing ring 5011 is the same as the middle of the inner cavity 406 of the pump body 400 The inner diameters are matched, and the sealing between the piston 500 and the pump body 400 is achieved through the first sealing ring 5011 . The first discharge channel 502 is arranged in the middle part along the axial direction of the piston 500, the lower part of the piston 500 is provided with a third through hole 505 along the radial side of the piston 500, and the opposite sides of the lower part of the piston 500 are provided with third through holes 505. The through hole 505 and the third through hole 505 communicate with the inner cavity 406 and the first discharge channel 502 .

The emulsion in the inner cavity 406 of the pump body 400 enters the first discharge channel 502 through the two third through holes 505, which is beneficial to speed up the flow of the emulsion. The bottom end of the piston 500 extends downward with a third connecting portion 504, the outer wall of the third connecting portion 504 is provided with a fourth sealing ring 5041, the third connecting portion 504 is inserted into the second inner cylinder 403 of the pump body 400, and passes through the third connecting portion 504. The four sealing rings 5041 realize the sealing between the third connecting part 504 and the second inner cylinder 403 .

The working process is as follows:

The initial state of the lotion pump is shown in Figure 2. When in use, press the pressure head 100, and the connecting pipe 200 drives the piston 500 to move downward to compress the air in the inner cavity 406 of the pump body 400. After releasing the pressure head 100, the return spring 800 The pressure head 100 is bounced back to its original position, and the piston 500 moves upward, causing the air pressure in the inner cavity 406 to be lower than the air pressure in the lotion bottle, and the pressure on the bottom of the plug 602 at the connection between the suction tube 700 and the inner cavity 406 is greater than the support of the supporting shrapnel When the force is applied, the plug 602 there floats up, the first through hole 4032 opens, the supporting shrapnel compresses, and the emulsion in the bottle enters the inner cavity 406 through the straw 700 and the second through hole 605 until the plug 602 is balanced by the force; press again The pressure head 100, the piston 500 goes down, so that the emulsion in the inner cavity 406 enters the first discharge channel 502 of the piston 500 and the connecting pipe 200 through the third through hole 505; 100 springs back to its original position, the air pressure in the connecting pipe 200 is greater than the air pressure in the pressure head 100, and the pressure on the bottom of the plug 602 at the connection between the connecting pipe 200 and the pressure head 100 is greater than the supporting force of the supporting shrapnel, the plug there 602 floats up, the fourth through hole 2041 is opened, and the emulsion enters the second discharge channel 104 of the pressure head 100 from the connecting pipe 200 and flows out from the discharge port 106 . The pressure head 100 is continuously pressed, and the emulsion continuously flows out from the discharge port 106 . When stopped, the two plugs 602 are automatically reset under the action of the supporting elastic pieces, and the first through hole 4032 and the fourth through hole 2041 are re-blocked, the discharge channel is blocked, and the emulsion will no longer flow out.

Using the lotion pump in the above technical solution, the plug 602 mainly relies on the supporting force of the elastic support 603 to block the first through hole 4032 and the fourth through hole 2041, instead of relying on its own gravity, once the bottle is tilted or inverted When the plug 602 is not easily displaced under the support force of the elastic support member 603, the discharge channel is still blocked, and it is difficult for the emulsion to flow out of the pressure head 100 automatically.

The above specific structure is a specific description of the preferred embodiment of the present invention, but does not limit the implementation and protection scope of the present invention. Those skilled in the art can also Various equivalent modifications or substitutions are made, and these equivalent modifications or substitutions are all included within the scope defined by the claims of the present application.

Claims (10)

1. An external spring lotion pump comprises a pressure head (100), a connecting pipe (200), a piston (500) and a cylindrical pump body (400), wherein the piston (500) is arranged in an inner cavity (406) of the pump body (400), the pressure head (100) and the piston (500) are connected through the connecting pipe (200), a first discharging channel (502) communicated with the connecting pipe (200) and the inner cavity (406) is arranged in the piston (500), and a second discharging channel (104) communicated with the connecting pipe (200) is arranged in the pressure head (100); the pressure head (100) is connected to the pump body (400) in a sliding mode, a return spring (800) is arranged between the pressure head (100) and the pump body (400), and the lower portion of the inner cavity (406) is connected with a suction pipe (700); the method is characterized in that: the inner side of the upper part of the connecting pipe (200) and the lower part of the inner cavity (406) are respectively provided with an isolation mechanism (600), each isolation mechanism (600) comprises a plug (602) and an elastic support piece (603), one end of each elastic support piece (603) is connected with the corresponding plug (602), and the other end of each elastic support piece (603) is connected with the corresponding connecting pipe (200) and the inner cavity (406); a first isolation plate (204) is arranged on the inner side of the upper part of the connecting pipe (200), a fourth through hole (2041) is formed in the middle of the first isolation plate (204), and under the action of the elastic supporting piece (603), the plug (602) seals the fourth through hole (2041) from the upper side so as to isolate the upper cavity and the lower cavity of the connecting pipe (200); a first through hole (4032) is formed in the bottom end of the connecting part of the inner cavity (406) and the suction pipe (700), and under the action of the elastic support (603), the plug (602) seals the first through hole (4032) from the upper side to isolate the inner cavity (406) and the suction pipe (700).

2. The external spring lotion pump as claimed in claim 1, wherein: the isolation mechanism (600) further comprises a cylindrical isolation block (604), one end of the elastic support piece (603) is connected with the plug (602), and the other end of the elastic support piece is connected with the cylindrical isolation block (604).

3. The external spring lotion pump as claimed in claim 2, wherein: the middle part of the cylindrical isolation block (604) is provided with a second through hole (605), the elastic supporting pieces (603) are a plurality of supporting elastic pieces which are arranged in a staggered mode and staggered with the second through hole (605), one end of each supporting elastic piece is connected with the plug (602), and the other end of each supporting elastic piece is connected with the cylindrical isolation block (604).

4. The external spring lotion pump as claimed in claim 1, wherein: a first outer buckling convex ring (205) is arranged on the outer side of the lower portion of the connecting pipe (200), a first outer extension portion (503) which is annular is upwards extended from the outer side of the middle portion of the piston (500), and a first inner buckling concave ring (5031) which is matched with the first outer buckling convex ring (205) is arranged on the inner wall of the first outer extension portion (503).

5. The external spring lotion pump as claimed in claim 4, wherein: the top end of the first outer extension portion (503) is outwards turned to form a fifth outer extension portion (501) in a ring shape, and a first sealing ring (5011) matched with the inner diameter of the middle of the inner cavity (406) is arranged on the outer wall of the fifth outer extension portion (501).

6. The external spring lotion pump as claimed in claim 1, wherein: the first discharging channel (502) is arranged in the middle of the piston (500) in the axial direction, a third through hole (505) is formed in the lower portion of the piston (500) along the radial side face of the piston (500), and the third through hole (505) is communicated with the inner cavity (406) and the first discharging channel (502).

7. The external spring lotion pump as claimed in claim 1, wherein: an insertion part (105) which can be inserted into the connecting pipe (200) is arranged in the pressure head (100), a second outer buckling convex ring (102) is arranged on the outer side of the insertion part (105), and a second inner buckling concave ring (202) matched with the second outer buckling convex ring (102) is arranged on the upper cavity of the connecting pipe (200).

8. The external spring lotion pump as claimed in claim 7, wherein: the second discharging channel (104) is arranged in the inserting part (105) and extends out of a discharging hole (106) towards one side.

9. The external spring lotion pump as claimed in claim 1, wherein: the top of the connecting pipe (200) is outwards turned to form an annular second external extension part (201), the top of the spiral cover (300) is provided with a groove (301), the bottom of the groove (301) upwards extends to form a first inner cylinder (307) with an opening at the upper end, the connecting pipe (200) penetrates through the first inner cylinder (307), the reset spring (800) is sleeved on the outer side of the connecting pipe (200), one end of the reset spring (800) is abutted to the second external extension part (201), and the other end of the reset spring is abutted to the groove (301).

10. The external spring lotion pump as claimed in claim 9, wherein: the outer side of the upper portion of the pump body (400) is provided with a third outer buckling convex ring (401), the upper portion of the screw cap (300) is outwards turned to form an annular third outer extension portion (302), and the inner wall of the third outer extension portion (302) is provided with a third inner buckling concave ring (3021) matched with the third outer buckling convex ring (401).

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