TWI789250B - Double-layer container lid - Google Patents

Abstract

Present invention discloses a double-layer container lid, including: a top cover having a cover top plate and a top cover side wall; a middle bolt having a cylindrical outer wall, a cylindrical inner wall, and an end connect potion connected to the lower end of the cylindrical outer wall and the cylindrical inner wall, and a top plate of the middle bolt connected to the top end of the cylindrical inner wall; the top cover and the middle bolt made by metal plate, and a thermal insulation space formed between the top cover and the middle bolt, and an outer thread formed on the cylindrical outer wall; and the cylindrical inner wall and the top plate of the middle bolt defined a water contain space recessed upward from the bottom of the middle plug, so that the double-layer container lid can be used as a water cup.

Description

Double container lid

The invention relates to a double-layer container cover, in particular to a double-layer container cover used for containers containing drinking water or beverages.

In recent years, due to modern people's pursuit of environmental protection and reducing the use of disposable plastic containers, it has become a trend in modern society to carry thermal insulation, cold insulation bottles or portable cups to hold drinking water or beverages.

In order to achieve heat preservation or cold preservation and light weight, the existing thermos bottle or cup will be made of double-layer metal, so that the container body of the thermos bottle or cup has a heat-insulating interlayer to reduce the temperature of the thermos bottle or cup. the heat conduction velocity. Moreover, during the manufacture of the existing thermos cup or thermos bottle, the heat-insulating interlayer of the main body can be further vacuumed by means of vacuuming, so as to further improve the heat-insulation capability.

However, the lids used in existing thermos cups or thermos bottles do not adopt a double-layer metal heat-insulating structure, so they do not have heat-insulating capabilities. In addition, in order to improve the thermal insulation capacity of some container lids, polyvinyl or other heat insulating materials will be stuffed in the middle plug of the lid, but this will increase the volume of the container lid and make it heavy.

Due to the above factors, the lids used in conjunction with existing containers have considerable inconvenience. Therefore, how to overcome the above-mentioned problems through structural improvement has become an important issue in this business.

The technical problem to be solved by the present invention is to provide a double-layer container cover by improving the defect of inconvenient use of the existing container cover.

In order to solve the above-mentioned technical problems, an embodiment of the present invention provides a double-layer container cover, which is used to be arranged on the opening of a container. The inner side of the opening has an internal thread, and the double-layer container cover can define Out of an upper end and a lower end, the double-layer container cover includes: a top cover, the top cover has a cover body top plate, and a top cover side wall extending downward from the outer peripheral edge of the cover body top plate, so The diameter of the top plate of the cover body and the side wall of the top cover is greater than the diameter of the opening of the container; a middle plug, the upper end of the middle plug is connected to the lower end of the top cover, and the middle plug has a round shape A cylindrical outer wall of the middle bolt, a crimping ring extending outward from the upper end of the outer wall of the middle bolt, an inner wall of the middle bolt arranged at intervals on the inner side of the outer wall of the middle bolt, connected to the outer wall of the middle bolt and the outer wall of the middle bolt A closed end between the lower ends of the inner wall of the middle bolt, and a middle bolt top plate formed on the upper end of the inner wall of the middle bolt; wherein, the diameter of the outer wall of the middle bolt is smaller than the diameter of the opening, and the outer wall of the middle bolt An external threaded portion is formed to fit the internal threaded portion, so that the middle bolt can be locked inside the opening; the outer peripheral edge of the crimping ring is connected to the lower end of the side wall of the top cover, and when the When the container cover is set on the opening, the crimping ring abuts against the upper end of the opening; and a sealing gasket, the sealing washer is sleeved on the lower side of the crimping ring, so that When the crimping ring is in contact with the upper end of the opening, it forms an airtight seal; wherein, the top plate of the top cover, the side wall of the top cover, the outer wall of the middle plug of the middle plug, the press The connecting ring, the inner wall of the middle bolt, the closed end, and the top plate of the middle bolt are formed by a metal plate, and the top plate of the cover is maintained between the crimping ring and the top plate of the middle bolt. distance to form a gap between the top plate of the cover body, the crimping ring, and the top plate of the middle bolt, and maintain a distance between the outer wall of the middle bolt and the inner wall of the middle bolt to form a gap between Another gap between the outer wall of the middle bolt and the inner wall of the middle bolt, and the gap between the outer wall of the middle bolt and the inner wall of the middle bolt is between the top plate of the cover body and the inner wall of the middle bolt. The gap between the top plate of the middle bolt and the crimping ring communicates with each other, thus forming a thermal insulation space between the top cover and the middle bolt; and the inner wall of the middle bolt and the middle bolt The bolt top plate jointly defines and forms a water holding space sunken from the lower end of the middle bolt toward the direction of the top cover, the diameter of the water holding space is not less than 60% of the inner diameter of the opening of the container, and the The height of the water holding space is not less than 50% of the diameter of the water holding space; the height of the crimping ring is configured to be lower than the height of the top plate of the middle bolt, so that the double-layer container cover is arranged on the container The lower end of the water holding space protrudes below the opening of the container, and the upper end of the water holding space protrudes above the opening, forming a straw for accommodating space.

One of the beneficial effects of the present invention is that it can provide a double-layer container cover made of metal plates and having a thermal insulation space, which has a double-layer container cover with light weight, good strength, and good thermal insulation effect, and The double-layer container cover also has the function of a drinking cup.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings related to the present invention. However, the provided drawings are only for reference and description, and are not intended to limit the present invention.

The implementation of the "double-layer container lid" disclosed in the present invention is described below through specific specific examples. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only for simple illustration, and are not drawn according to the actual size, which is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention. In addition, the term "or" used herein may include any one or a combination of more of the associated listed items depending on the actual situation.

[first embodiment]

Referring to Fig. 1 to Fig. 4, the first embodiment of the present invention provides a double-layer container cover 2, which can be arranged on a container 1, and is used to seal the opening of the container 1 .

The container 1 has a container body 100, the container body 100 is a cylindrical container, and has an opening 110 at the upper end of the container body 100, the upper end of the opening 110 forms a ring-shaped flange, and An internal thread portion 111 is formed inside the opening portion 110 . In this embodiment, the container body 100 may be a double-layered container made of sheet metal, which has the function of keeping heat or cold. However, the container body 100 of the present invention is not limited thereto. The container body 100 can also be a container made of other materials. For example, the container body 100 can also be made of plastic, ceramics, or glass. Insulated container.

For ease of description, the double-layer container cover 2 can define opposite upper and lower ends, and the double-layer container cover 2 includes a top cover 200 located at the upper end, and a middle cover connected to the lower end of the top cover 200. The plug 300 and the sealing washer 500 arranged on the middle plug 300 . Wherein, the top cover 200 and the middle plug 300 are made of metal plates. And preferably, the top cover 200 and the middle plug 300 are made of titanium metal plate. There is a gap between the top cover 200 and the middle plug 300, and the edges where the top cover 200 and the middle plug 300 join each other are connected by means of welding, so that the edges where the top cover 200 and the middle plug 300 join each other are sealed, Therefore, the gap between the top cover 200 and the middle plug 300 forms an airtight heat-insulating space 400 .

The top cover 200 has a cover top plate 210 and a top cover sidewall 220 extending downward from an outer periphery of the cover top plate 210 . The cover top plate 210 is substantially circular, and the diameters of the cover top plate 210 and the top cover sidewall 220 are larger than the diameter of the opening 110 of the container 1 . The middle plug 300 is connected to the lower end of the top cover 200 . The middle plug 300 roughly has a diameter slightly smaller than that of the opening 110 and can be accommodated inside the opening 110 .

As shown in Figures 2 and 3, in this embodiment, the middle plug 300 has a cylindrical middle plug outer wall 310, and a crimping ring 320 extending outward from the upper end of the middle plug outer wall 310, and a middle plug inner wall 330 disposed on the inner side of the middle plug outer wall 310 at intervals. And a closed end portion 350 connected between the outer wall 310 of the middle plug and the lower end of the inner wall 330 of the middle plug, and a top plate 340 of the middle plug formed at the upper end of the inner wall 330 of the middle plug. Wherein, the diameter of the outer wall 310 of the middle plug is smaller than the diameter of the opening 110, and an outer threaded portion 311 is formed on the outer wall 310 of the middle plug to fit the inner threaded portion 111, so that the middle plug 300 The internal thread portion 111 and the external thread portion 311 can be locked inside the opening portion 110 . In this embodiment, the crimping ring 320 is integrally connected to the upper end of the outer wall 310 of the middle plug, and the cross-sectional shape of the crimping ring 320 roughly forms an arc with the concave surface facing downward.

The sealing gasket 500 is sleeved on the outer wall 310 of the middle plug at the position below the crimping ring 320 , and when the double-layer container lid 2 is set on the opening 110 , the crimping ring 320 The sealing gasket 500 can be in contact with the upper edge of the opening 110 , and the sealing gasket 500 can be tightly connected to the upper edge of the opening 110 to prevent water leakage.

The middle bolt top plate 340 is integrally formed and connected to the upper end of the middle bolt inner wall 330, so that the middle bolt inner wall 330 and the middle bolt top plate 340 form a blind hole concave upward from the lower end of the middle bolt 300, And jointly define and form a water holding space 360 that is recessed from the lower end of the middle plug 300 toward the direction of the top cover 200 . As shown in FIG. 4 , the water holding space 360 is used to hold beverages or drinking water, so that the double-layer container cover 2 of the present invention also has the function of a drinking cup. Furthermore, in order to make the water holding space 360 have a sufficient volume, the diameter of the water holding space 360 is configured to be not less than 60% of the inner diameter of the opening 110 of the container body 100, and the The height of the water holding space 360 is configured to be not less than 50% of the diameter of the water holding space 360 in principle. More specifically, the diameter of the water holding space 360 is not less than 30 mm, the height of the water holding space 360 is not less than 15 mm, and the volume of the water holding space 360 is not less than 10 cubic centimeters (cm ³ ).

As shown in FIG. 4 , the double-layer container cover 2 of the present invention can be used to hold water because the water holding space 360 is formed inside the middle plug 300 and the water holding space 360 has sufficient volume. Drinking water or beverages, so when the user removes the double-layer container cover 2 from the opening, the user can turn the double-layer container cover 2 upside down and put the beverage or beverage contained in the container body 100 Drinking water is poured into the water holding space 360, and the double-layer container cover 2 can be used as a water cup.

The closed end 350 is connected between the outer wall 310 of the middle plug and the lower end of the inner wall 330 of the middle plug, so that the lower end of the outer wall 310 of the middle plug, the closed end 350, and the lower end of the middle plug The lower end of the inner wall 330 forms a closure.

As shown in Fig. 1 and Fig. 2, the cover top plate 210, the top cover side wall 220 of the top cover 200 of the present invention, the middle plug outer wall 310 of the middle plug 300, the crimping ring 320, the inner wall 330 of the middle bolt, the closed end 350, and the top plate 340 of the middle bolt are all formed of a metal plate, and the top plate 210 of the cover body, the crimping ring 320, the middle bolt A distance is kept between the bolt top plates 340 to form a gap, and a distance is also kept between the middle bolt outer wall 310 and the middle bolt inner wall 330 to form another gap, and the cover top plate 210 and the The gap between the crimping ring 320 and the top plate 340 of the middle plug, and the gap between the outer wall 310 of the middle plug and the inner wall 330 of the middle plug communicate with each other, thus forming a gap between the top cover 200 and the middle plug. A heat-insulating space 400 between the middle plugs 300, and the heat-insulating space 400 is a closed space, and will not convect the air outside the double-layer container cover 2, thereby reducing heat conduction and heat convection effect, so that the double-layer container cover 2 has the function of heat insulation and heat preservation.

It is worth noting that, in order to make the double-layer container cover 2 have a sufficient thermal insulation effect, the distance between the cover top plate 210 and the middle plug top plate 340 is preferably configured to be greater than 3mm, and the middle plug The distance between the outer wall 310 and the middle bolt inner wall 330 is also configured to be greater than 3mm, so that the cover top plate 210 and the middle bolt top plate 340 and the middle bolt outer wall 310 and the middle bolt inner wall 330 have sufficient spacing to reduce heat convection conduction or radiation conduction between the cover top plate 210 and the middle plug top plate 340, and between the middle plug outer wall 310 and the middle plug inner wall 330 . In addition, in order to further improve the thermal insulation effect of the double-layer container cover 2, the thermal insulation space 400 can form a vacuum to further reduce heat conduction.

It is worth noting that, in this embodiment, the height of the crimping ring 320 of the middle plug 300 of the double-layer container cover 2 is configured to be lower than the height of the middle plug top plate 340, so that the The height of the upper end of the water holding space 360 is higher than the height of the crimping ring 320 . Therefore, when the double-layer container cover 2 is arranged on the opening 110 of the container body 100, the lower end of the water holding space 360 protrudes below the opening 110 of the container 1, and the The upper end of the water holding space 360 can protrude from the upper end of the opening 110 . The part of the water holding space 360 protruding from the upper end of the opening 110 can form a straw accommodating space for accommodating a straw, so when the container 1 is used with a straw 120 whose length is greater than the height of the container body 100 , The part where the upper end of the straw 120 protrudes outside the opening 110 can be accommodated in the straw accommodating space at the upper end of the water holding space 360 , so that when the straw 120 is placed in the container body 100 Next, when the double-layer container cover 2 is closed on the opening 110 , it will not interfere with the straw 120 , and there is no need to take the straw 120 out of the container body 100 to prevent the straw 120 from being polluted.

More specifically, in this embodiment, the height difference between the middle pin top plate 340 and the crimping ring 320 is configured to be between 5 mm and 50 mm. Through the above configuration, the difference between the length of the straw 120 and the height of the container body 100 can be between 5 mm and 50 mm. In other words, after the straw 120 is inserted into the container body 100 , the length of the upper end of the straw 120 protruding from the upper end of the opening 110 can also be between 5mm and 50mm, so that after the user opens the double-layer container cover 2, he does not need to use his fingers to hold the straw 120 is extracted from the container body 100, and the upper end of the straw 120 can be sucked directly with the lips.

As shown in Fig. 2 and Fig. 3, it is a more detailed structure of the double-layer container cover 2 of the present invention. The double-layer container cover 2 of the present invention is generally made of a first plate P1 to form the top cover 200, and a second plate P2 and a third plate P3 to form the middle plug 300, The first plate P1, the second plate P2 and the third plate P3 can use titanium metal plates or stainless steel plates with a thickness between 0.3mm and 1.5mm, and can be manufactured by means of stamping, rolling, etc. Furthermore, the first plate P1 , the second plate P2 and the third plate P3 are connected as a whole by means of welding to form the double-layer container cover 2 .

In more detail, as shown in FIG. 3 , in this embodiment, the cover top plate 210 and the top cover side wall 220 of the top cover 200 are integrally formed by the first plate P1; The crimping ring 320 of the middle bolt 300 and the outer wall 310 of the middle bolt are integrally formed by the second plate P2; the inner wall 330 of the middle bolt and the top plate 340 of the middle bolt are formed by the The third plate P3 is integrally formed. Moreover, the closed end portion 350 is also formed by the second plate P2, so that the closed end portion 350 is integrally connected to the lower end of the middle plug outer wall 310 .

And as shown in FIG. 2 , the outer peripheral edge of the crimping ring 320 is welded to the lower end of the inside of the top cover side wall 220 through welding means, so that the outer peripheral edge of the crimping ring 320 and the lower end of the top cover side wall 220 The junction forms a first welding portion W1. And the end of the closed end 350 relative to the middle plug outer wall 310 is connected to the lower end of the middle plug inner wall 330 through welding means, thus making the closed end 350 and the lower end of the middle plug inner wall 330 The joints form the second welding part.

Although the present embodiment discloses that the closed end portion 350 is formed by the second plate P2 and integrally formed on the lower end of the outer wall 310 of the middle plug, and the second welding portion W2 is formed on the closed end The junction of the part 350 and the lower end of the inner wall 330 of the middle plug, however, the present invention is not limited thereto. For example, in an embodiment not shown in the figure of the present invention, the closed end 350 can also be formed by the third plate P3, and the closed end 350 is integrally connected to the inner wall of the middle bolt 330 , and the second welding portion W2 is formed at the connection between the closed end portion 350 and the lower end of the middle plug outer wall 310 .

[Advantageous Effects of Embodiments]

One of the beneficial effects of the embodiment of the present invention is that the double-layer container lid is configured to have a top cover through "configuring the double-layer container lid, and the top cover has the top plate of the cover body, and from the cover A top cover side wall extending downward from the outer peripheral edge of the top plate of the body", and "a middle bolt, the middle bolt has the outer wall of the middle bolt, the crimping ring, the inner wall of the middle bolt, and is connected to the a closed end between the outer wall of the middle bolt and the lower end of the inner wall of the middle bolt, and a middle bolt top plate formed on the upper end of the inner wall of the middle bolt”; and “the top cover and the middle bolt are made of metal plates Made, and the distance between the crimping ring, the top plate of the middle bolt and the top plate of the cover body, and the outer wall of the middle bolt and the inner wall of the middle bolt are all kept apart, and they are jointly defined to form a a heat-insulating space between the top cover and the middle plug”; and “the side wall of the middle plug and the top plate of the middle plug jointly define a water tank that is sunken from the lower end of the middle plug toward the top cover. The technical solution of "space" makes the double-layer container cover form a double-layer metal structure with a heat-insulating space, and has the characteristics of good strength, light weight, and good heat-insulation effect, and makes the double-layer container cover Can double as a drinking cup.

Furthermore, in the double-layer container lid of the present invention, the height of the crimping ring is configured to be lower than the height of the middle bolt top plate, so that the double-layer container lid is arranged on the container The upper end of the water holding space protrudes above the opening to form a straw accommodating space. Therefore, when the straw is inserted into the container, the length of the straw can be greater than the height of the container, and the part of the upper end of the straw protruding from the opening of the container can be accommodated in the straw accommodating space at the upper end of the water holding space. Therefore, when the double-layer container cover is closed on the container opening, it is not necessary to draw out the straw. And when the lid of the double-layer container is opened, the upper end of the straw is directly exposed outside the opening of the container, without pulling the straw out with fingers.

Furthermore, the top cover and middle plug of the double-layer container lid of the present invention can be made of titanium metal plate or stainless steel plate, and through the means of forming an airtight heat-insulating space between the top cover and the middle plug , so that the double-layer container cover does not need to use plastic or polymer insulation materials to have heat insulation function, so that drinking water or beverages will not come into contact with plastics, and prevent polymer insulation materials from being released when they contact high-heat drinking water or beverages Risk of Toxic Substances.

The content disclosed above is only a preferred feasible embodiment of the present invention, and does not therefore limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

1: container 2: Double-layer container cover 100: container body 110: opening 111: internal thread part 120: Straw 200: top cover 210: cover top plate 220: top cover side wall 300: middle bolt 310: Outer wall of middle bolt 311: external thread part 320: Crimp ring 330: Inner wall of middle bolt 340: middle bolt top plate 350: closed end 360: water storage space 400: Insulation space 500: Gasket P1: first board P2: Second board P3: The third board W1: The first welding part W2: Second welding part

Fig. 1 is a combined cross-sectional schematic diagram of an embodiment of a double-layer container cover of the present invention.

FIG. 2 is a partially enlarged schematic cross-sectional view taken from part II of FIG. 1 .

Fig. 3 is an exploded schematic view of the first embodiment of the double-layer container lid of the present invention.

Fig. 4 is a schematic diagram of the use state of the double-layer container cover of the present invention used as a water cup.

Fig. 5 is a schematic cross-sectional view of a double-layer container cover of the present invention installed on a container.

1: container 2: Double-layer container cover 100: container body 110: opening 111: internal thread part 200: top cover 210: cover top plate 220: top cover side wall 300: middle bolt 310: Outer wall of middle bolt 311: external thread part 320: Crimp ring 330: Inner wall of middle bolt 340: middle bolt top plate 350: closed end 360: water storage space 400: Insulation space 500: Gasket

Claims (10)

A double-layer container cover is used to be arranged on the opening of a container, the inner side of the opening has an internal thread, the double-layer container cover can define an upper end and a lower end, the double-layer container Cover includes: A top cover, the top cover has a cover body top plate and a top cover side wall extending downward from the outer periphery of the cover body top plate, the diameter of the cover body top plate and the top cover side wall is larger than that of the container The diameter of the opening; A middle bolt, the upper end of the middle bolt is connected to the lower end of the top cover, the middle bolt has a cylindrical outer wall of the middle bolt, a crimping ring extending outward from the upper end of the outer wall of the middle bolt, a middle bolt inner wall arranged at intervals on the inner side of the middle bolt outer wall, a closed end connected between the middle bolt outer wall and the lower end of the middle bolt inner wall, and a closed end formed on the inner side of the upper end of the middle bolt inner wall The top plate of the middle bolt; wherein, the diameter of the outer wall of the middle bolt is smaller than the diameter of the opening, and an outer thread part is formed on the outer wall of the middle bolt to fit the inner thread part, so that the middle bolt can be locked Inside the opening; the outer peripheral edge of the crimping ring is connected to the lower end of the side wall of the top cover, and when the container cover is set on the opening, the crimping ring abuts against the opening the upper end of the part; and A sealing gasket, the sealing gasket is sleeved on the lower side of the crimping ring, so that when the crimping ring contacts the upper end of the opening part, it forms an airtight seal; Wherein, the top cover of the top cover, the side wall of the top cover, the outer wall of the middle plug of the middle plug, the crimping ring, the inner wall of the middle plug, the closed end, The top plate of the middle bolt is formed of a metal plate, and the distance between the top plate of the cover body and the crimping ring and the top plate of the middle bolt is kept to form a gap between the top plate of the cover body and the crimping ring. , a gap between the top plate of the middle bolt, and keep a distance between the outer wall of the middle bolt and the inner wall of the middle bolt, so as to form a gap between the outer wall of the middle bolt and the inner wall of the middle bolt Another gap, and the gap between the outer wall of the middle bolt and the inner wall of the middle bolt and the gap between the top plate of the cover body, the top plate of the middle bolt, and the crimping ring are mutually communicating, thereby forming an insulating space between said top cover and said middle plug; and The inner wall of the middle plug and the top plate of the middle plug jointly define a water holding space that is recessed from the lower end of the middle plug toward the top cover, and the diameter of the water holding space is not smaller than the opening of the container 60% of the inner diameter of the inner part, and the height of the water holding space is not less than 50% of the diameter of the water holding space; the height of the crimping ring is configured to be lower than the height of the middle bolt top plate, so that the When the double-layer container cover is installed on the opening of the container, the lower end of the water holding space protrudes below the opening of the container, and the upper end of the water holding space protrudes beyond the opening of the container. Above the opening, a straw accommodating space is formed. The double-layer container lid as claimed in claim 1, wherein, the top plate of the top cover and the side wall of the top cover are integrally formed by a first plate; The crimping ring and the outer wall of the middle bolt are integrally formed by a second plate; the inner wall of the middle bolt and the top plate of the middle bolt are integrally formed by a third plate; the closed end It is integrally formed and connected to the lower end of the outer wall of the middle plug or the lower end of the inner wall of the middle plug. The double-layer container lid as claimed in claim 2, wherein the first plate, the second plate, and the third plate are connected together by means of welding technology, and make the thermal insulation space form a sealed state. The double-layer container lid as claimed in item 3, wherein the first welding part is formed at the connection between the outer peripheral edge of the crimping ring and the lower end of the side wall of the top cover; the sealing end and the inner wall of the middle plug The junction of the lower end, or the junction of the lower end of the closed end and the outer wall of the middle plug forms a second welding portion. The double-layer container lid according to any one of claims 1 to 4, wherein, the top cover and the middle plug are made of titanium metal plate or stainless steel plate. The double-layer container lid as claimed in claim 3, wherein the first plate, the second plate, and the third plate are titanium metal plates or stainless steel plates, and the first plate, the second plate, and the third plate are titanium metal plates or stainless steel plates, The thickness of the second board and the third board is between 0.3 mm and 1.5 mm. The double-layer container cover as claimed in item 5, wherein the volume of the water holding space is not less than 10 cubic centimeters (cm ³ ). The double-layer container lid according to claim 7, wherein the diameter of the water holding space is not less than 30mm, and the height of the water holding space is not less than 15mm. The double-layer container lid as claimed in item 5, wherein, the height difference between the middle bolt top plate and the crimping ring is between 5mm and 50mm. The double-layer container lid according to claim 5, wherein the distance between the top plate of the lid body and the top plate of the middle plug, and the distance between the outer wall of the middle plug and the inner wall of the middle plug are configured to be greater than 3 mm.

Images