Arc-shaped airtight zipper

Abstract

The utility model discloses an arc airtight zipper which comprises an outer zipper strip, an inner zipper strip and a zipper head, the outer zipper strip comprises a first sealing belt, a first lip-shaped sealing piece and outer zipper teeth, and the inner zipper strip comprises a second sealing belt, a second lip-shaped sealing piece and inner zipper teeth. The distance between every two adjacent outer zipper teeth is larger than the distance between every two adjacent inner zipper teeth. The outer zipper teeth and the inner zipper teeth are meshed with each other or separated from each other when the zipper head is closed; and during pulling and meshing, the lip part of the first lip-shaped sealing piece and the lip part of the second lip-shaped sealing piece are mutually attached and sealed. According to the arc-shaped airtight zipper, the lip-shaped sealing pieces connected with the zipper teeth are arranged, when the zipper head is closed, the zipper teeth drive the lip-shaped sealing pieces to be attached and sealed, the air tightness of the zipper is guaranteed while arc-shaped closing of the zipper is achieved, and the pressure-bearing airtight requirement of special clothes is met.

Description

Technical Field

[0001] The utility model relates to a clothing zipper, in particular to an arc-shaped airtight zipper. Background Art

[0002] At present, straight zippers are usually used on special clothing with pressure-bearing and airtight functions, such as diving suits, medical positive pressure protective clothing, and pilot clothing. Due to the limitation of the shape of the clothing, the opening of the straight zipper is small, which is not convenient for putting on and taking off. In related technologies, arc zippers are usually used to increase the size of the clothing opening and improve the wearing and taking off. However, this type of zipper has poor airtightness and cannot meet the pressure-bearing and airtightness function of special clothing. Utility Model Content

[0003] The utility model aims to solve the problem that the air tightness of the arc-shaped zipper in the prior art is poor and cannot meet the pressure-bearing airtightness function of special clothing.

[0004] The purpose of this utility model is to adopt the following technical solutions to achieve:

[0005] The utility model provides an arc-shaped airtight zipper, comprising:

[0006] The outer chain comprises a first sealing belt, a first lip seal fixed to one side of the first sealing belt, and a plurality of outer chain teeth arranged side by side and having sealing ends and fixed ends;

[0007] An inner chain, comprising a second sealing belt, a second lip seal fixed to one side of the second sealing belt, and a plurality of inner chain teeth arranged side by side and having sealing ends and fixed ends;

[0008] A zipper head having a slide groove inside, one end of the slide groove having two separate chain entrances which merge inside to form a chain bite outlet at the other end, the fixed ends of the outer chain teeth and the inner chain teeth can enter the slide groove by pulling the zipper head, and slide relative to the zipper head between one of the chain entrances and the chain bite outlet to engage with or separate from each other;

[0009] When pulled together and bitten, the lip of the first lip seal and the lip of the second lip seal are in close contact and sealed with each other;

[0010] The outer chain and the inner chain respectively have an arc section, and in the arc section, the distance between two adjacent outer chain teeth is greater than the distance between two adjacent inner chain teeth.

[0011] Preferably, the outer chain teeth and the inner chain teeth are respectively U-shaped structures;

[0012] The two opposite ends of the U-shaped structure are the sealing end and the fixed end respectively; the sealing end of the outer chain tooth is embedded in the first lip seal, and the sealing end of the inner chain tooth is embedded in the second lip seal.

[0013] Preferably, the outer chain teeth and the inner chain teeth are respectively W-shaped structures formed by connecting two U-shaped structures;

[0014] The two ends of the two U-shaped structures that are opposite to each other are fixed ends, and the two connected ends are sealing ends; the two sealing ends of the outer chain teeth are embedded in the first lip seal, and the two sealing ends of the inner chain teeth are embedded in the second lip seal.

[0015] Preferably, the outer chain and the inner chain respectively further have at least one straight section connected to the arc section, and in the straight section, the spacing between two adjacent outer chain teeth and the spacing between two adjacent inner chain teeth are equal.

[0016] Preferably, the zipper further comprises: a head;

[0017] The outer chain and the inner chain have a starting end and a terminal end respectively. The starting end of the outer chain is fixedly sealed with the starting end of the inner chain, and the terminal end of the outer chain is sealed with the terminal end of the inner chain through the head.

[0018] Preferably, the sealing head comprises: two ends arranged opposite to each other, and a connecting portion elastically connecting the two ends;

[0019] The two end portions are respectively connected to the first lip seal and the second lip seal; the two end portions can be inserted into the slide groove and slide relative to the zipper head when pulled and closed, and the outlets are respectively inserted into one of the chain entrances after the chain is engaged and sealed with the chain entrance.

[0020] Preferably, the connection points between the connecting portion and the two end portions respectively have external protrusions, and the sliding groove has convex grooves correspondingly engaged with the external protrusions.

[0021] Preferably, the first lip seal and the second lip seal are elastomers, and the lips of the two are bending structures that can be spliced ​​and sealed with each other.

[0022] Preferably, the zipper head includes a slider body, a pull handle, and a movable connecting piece connecting the slider body and the pull handle.

[0023] Preferably, the movable connecting member comprises a pull ring and a pull belt connecting the pull ring and the pull handle; the slider body is provided with a connecting ring, and the pull ring is sleeved with the connecting ring.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The utility model provides an arc-shaped airtight zipper, which forms a zipper with an arc-shaped section by arranging a plurality of inner chain teeth and outer chain teeth with different tooth spacings that mesh with each other on inner and outer chains side by side, wherein the tooth spacing of the outer chain teeth is greater than the tooth spacing of the inner chain teeth, and can increase the size of the clothing opening and improve the wearing and taking off properties. At the same time, by arranging a second lip seal connected to the plurality of inner chain teeth and a first lip seal connected to the plurality of outer chain teeth, when the zipper head closes the inner and outer chain teeth, the outer chain teeth and the inner chain teeth respectively drive the first lip seal and the second lip seal to fit and seal with each other, thereby achieving a zipper sealing effect, achieving the arc-shaped closing of the zipper while ensuring the airtightness of the zipper, and meeting the pressure-bearing airtightness requirements of special clothing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a curved airtight zipper of the utility model;

[0027] Figure 2 It is a partial schematic diagram of the front view structure of a curved airtight zipper with U-shaped inner and outer chain teeth of the utility model;

[0028] Figure 3 It is a partial schematic diagram of a top view of a curved airtight zipper with U-shaped inner and outer chain teeth according to the utility model;

[0029] Figure 4 It is a partial schematic diagram of the front view structure of an arc-shaped airtight zipper with W-shaped internal and external chain teeth of the utility model;

[0030] Figure 5 It is a partial schematic diagram of the front view structure of a zipper head of a curved airtight zipper of the utility model;

[0031] Figure 6 It is a partial schematic diagram of the top view of the zipper head of a curved airtight zipper of the utility model;

[0032] Figure 7 It is a schematic diagram of the overall structure of a zipper head of a curved airtight zipper of the utility model;

[0033] Figure 8 It is a front view structural schematic diagram of a sealing head of an arc-shaped airtight zipper of the utility model;

[0034] Fig. 9 It is a schematic diagram of the top view of the sealing head of a curved airtight zipper of the utility model;

[0035] Among them, the zipper 100, the outer chain 1, the starting end 1a of the outer chain, the terminal 1b of the outer chain, the outer chain teeth 11, the fixed end 11a of the outer chain teeth, the sealed end 11b of the outer chain teeth, the first lip seal 12, the first sealing tape 13, the inner chain 2, the starting end 2a of the inner chain, the terminal 2b of the inner chain, the inner chain teeth 21, the fixed end 21a of the inner chain teeth, the sealed end 21b of the inner chain teeth, the second lip seal 22, the second sealing tape 23, the zipper head 3, the slider body 31, the slide groove 311, the chain entrance 311a, the chain outlet 311b after engagement, the separator 312, the connecting ring 313, the movable connecting part 32, the pull ring 321, the pull belt 322, the pull handle 33, the head 4, the end 41, the connecting part 42, and the outer protrusion 421. DETAILED DESCRIPTION

[0036] The following is a further detailed description of the specific implementation of the present utility model in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present utility model, but are not intended to limit the scope of the present utility model.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Example 1

[0039] Figure 1 A structural schematic diagram of an arc-shaped airtight zipper of the utility model is given; Figure 2 A partial schematic diagram of the front view structure of an arc-shaped airtight zipper with U-shaped inner and outer chain teeth of the utility model is given; Figure 3 A partial schematic diagram of a top view of an arc-shaped airtight zipper with U-shaped inner and outer chain teeth of the utility model is given; Figure 4 A partial schematic diagram of the front view structure of an arc-shaped airtight zipper with inner and outer chain teeth of a W-shaped structure is given; Figure 5 A partial schematic diagram of the front view structure of a zipper head of a curved airtight zipper of the utility model is given; Figure 6 A partial schematic diagram of the top structure of a zipper head of an arc-shaped airtight zipper of the utility model is provided.

[0040] like Figures 1 to 6As shown, an arc-shaped airtight zipper provided by an embodiment of the utility model comprises: an outer chain 1, an inner chain 2 and a zipper head 3; the outer chain 1 comprises a first sealing belt 13, a first lip seal 12 fixed to one side of the first sealing belt 13, and a plurality of outer chain teeth 11 arranged side by side and having a sealing end 11b and a fixed end 11a; the inner chain 2 comprises a second sealing belt 23, a second lip seal 22 fixed to one side of the second sealing belt 23, and a plurality of inner chain teeth 21 arranged side by side and having a sealing end 21b and a fixed end 21a; the zipper head 3 has a slide groove 311 inside, and one end of the slide groove 311 has two separated chain entrances 31 1a and merge internally into a chain engagement outlet 311b at the other end, the fixed end 11a of the outer chain tooth and the fixed end 21a of the inner chain tooth can enter the slide groove 311 by pulling the zipper head 3, and respectively slide relative to the zipper head 3 between the chain entrance 311a and the chain engagement outlet 311b to engage or separate with each other; when pulling and engaging, the lip of the first lip seal and the lip of the second lip seal fit together and seal; the outer chain 1 and the inner chain 2 respectively have an arc section, and in the arc section, the distance between two adjacent outer chain teeth 11 is greater than the distance between two adjacent inner chain teeth 21.

[0041] Among them, both the inner chain 2 and the outer chain 1 have arc sections, the curvature of the arc sections of the two are matched, and the length of the arc section of the inner chain 2 is less than the length of the arc section of the outer chain 1. The inner chain 2 and the outer chain 1 are respectively provided with equal numbers of inner chain teeth 21 and outer chain teeth 11, the tooth spacing of the outer chain teeth 11 is greater than the tooth spacing of the inner chain teeth 21, and the chains form an arc shape when they are engaged with each other. The arc-shaped zipper 100 can increase the size of the clothing opening and improve the wearing and taking off. Furthermore, the inner chain 2 and the outer chain 1 can also be provided with a straight line section area, and the tooth spacing of the inner and outer chain teeth 11 in the straight line section area is equal to the tooth spacing of the inner chain teeth 21, and the two ends of the arc section can be connected to a straight line section respectively.

[0042] The first lip seal 12 and the second lip seal 22 are strip structures, which can be cloth belts, rubber belts, etc. A plurality of outer chain teeth 11 are arranged side by side on the first lip seal 12 to form an outer chain 1, and a plurality of inner chain teeth 21 are arranged side by side on the second lip seal 22 to form an inner chain 2, wherein the two ends of the outer chain teeth 11 are divided into a fixed end 11a and a sealing end 11b, and the two ends of the inner chain teeth 21 are divided into a fixed end 21a and a sealing end 21b, the sealing end 11b of the outer chain teeth is connected to the first lip seal 12, and the sealing end of the inner chain teeth 21b is connected to the second lip seal 22, and the lips of the first lip seal 12 and the second lip seal 22 are arranged opposite to each other. When pulled together, the fixed end 11a of the outer chain tooth and the fixed end 21a of the inner chain tooth bite each other, and the sealing end 11b of the outer chain tooth drives the first lip seal 12 to be squeezed inward, and the sealing end 21b of the inner chain tooth drives the second lip seal 22 to be squeezed inward, so that the lips of the first lip seal 12 and the second lip seal 22 are respectively squeezed, fitted and spliced ​​together, thereby realizing the sealing of the zipper 100.

[0043] It should be noted that, in order to facilitate the lips of the first lip seal 12 and the second lip seal 22 to fit well, the sealing end 11b of the outer chain tooth can be embedded and fixed in the first lip seal 12 by vulcanization, and the fixed end 11a is exposed on the outside of the first lip seal 12, and the sealing end 21b of the inner chain tooth can be embedded and fixed in the second lip seal 22 by vulcanization, and the fixed end 21a is exposed on the outside of the second lip seal 22. The embodiment of the utility model does not make specific restrictions on this. In the arc section of the zipper 100, the first lip seal 12 and the second lip seal 22 are also arc-shaped. In order to make the fitting connection more firm and the sealing performance more stable, the first lip seal 12 and the second lip seal 22 can be elastomers, and the lips of the two can be designed with a bending structure that is spliced ​​and sealed with each other, such as S-shaped, wavy or inclined, etc., which can increase the contact area of ​​the sealing surface and improve the air tightness.

[0044] The first lip seal 12 and the second lip seal 22 can be vulcanized and molded using natural rubber. The first sealing belt 13 and the first lip seal 12, and the second sealing belt 23 and the second lip seal 22 can be connected to each other at the edges or partially connected to each other. The connection method can be sealed and bonded together using an adhesive, which is not specifically limited in the embodiment of the utility model. The first sealing belt 13 and the second sealing belt 23 can be natural rubber coated fabric.

[0045] The zipper head 3 is used to pull the outer chain 1 and the inner chain 2 together, so that the two are engaged or separated. Specifically, the zipper head 3 has a slide groove 311 inside, and both ends of the slide groove 311 are openings, one end of which is a chain entrance 311a, and the other end is a chain engagement rear exit 311b. The two sides of the slide groove 311 have movable openings connected to the slide groove 311. The fixed end 11a of the outer chain tooth is inserted into the slide groove 311 through the movable opening on one side, and can slide from the chain entrance 311a to the chain engagement rear exit 311b in the slide groove 311. The fixed end 21a of the inner chain tooth is inserted into the slide groove 311 through the movable opening on the other side, and can slide from the chain entrance 311a to the chain engagement rear exit 311b in the slide groove 311. The width of the movable opening is smaller than the thickness of the fixed end 11a of the outer chain tooth and the fixed end 21a of the inner chain tooth, so that the outer chain tooth 11 and the inner chain tooth 21 are limited to move in the slide groove 311. A separator 312 is provided at the chain entrance 311a in the chute 311. The separator 312 is connected to the upper and lower groove walls of the chute 311. The separator 312 separates the chain entrance 311a into two entrances. The length of the separator 312 is shorter than the length of the chute 311, so that the two chain entrances 311a merge into a rear exit inside the chute 311, i.e., the chain bite rear exit 311b. The function of the separator 312 is that when the zipper head 3 is pulled forward, the outer chain teeth 11 and the inner chain teeth 21 enter from the two separated chain entrances 311a, are squeezed by the groove wall of the zipper head 3 to the chain bite rear exit 311b to bite and connect with each other, so that the zipper 100 is closed. When the zipper head 3 is pulled backward, the separator 312 separates the bite outer chain teeth 11 and the inner chain teeth 21, so that the zipper 100 is opened. The separator 312 may be a separator sheet or a separator block, which is vertically arranged in the slide groove 311 , and the embodiment of the utility model does not make any specific limitation to this.

[0046] An arc-shaped airtight zipper provided by an embodiment of the utility model forms a zipper 100 with an arc-shaped segment by arranging a plurality of mutually meshing teeth with different spacings side by side on the inner and outer chains, wherein the spacing of the outer teeth 11 is greater than the spacing of the inner teeth 21, thereby increasing the size of the clothing opening and improving the wearing and taking off properties. At the same time, by arranging a second lip seal 22 connected to the plurality of inner teeth 21 and a first lip seal 12 connected to the plurality of outer teeth 11, when the zipper head 3 closes the inner and outer teeth, the outer teeth 11 and the inner teeth 21 respectively drive the first lip seal 12 and the second lip seal 22 to fit and seal with each other, thereby achieving the sealing effect of the zipper 100, achieving the arc-shaped closing of the zipper 100 while ensuring the airtightness of the zipper 100, and meeting the pressure-bearing and airtight requirements of special clothing.

[0047] Example 2

[0048] Based on the same inventive concept, the arc-shaped airtight zipper provided in this embodiment is basically the same as that in Embodiment 1. For the sake of brevity, in the description of this embodiment, the same technical features as those in Embodiment 1 are no longer described, and only the differences between this embodiment and Embodiment 1 are described:

[0049] like Figure 2 and 3 As shown, the outer chain tooth 11 and the inner chain tooth 21 are respectively U-shaped structures; the opposite ends of the U-shaped structure are respectively the sealing end and the fixed end; the sealing end 11b of the outer chain tooth is embedded in the first lip seal 12, and the sealing end 21b of the inner chain tooth is embedded in the second lip seal 22.

[0050] The chain teeth have a U-shaped structure, and the sealing ends are embedded in the lip seals, so that the lip seals connecting the chain teeth can be kept parallel to the biting ends (fixed ends) of the chain teeth. The embedded connection can make the two lip seals more securely fixed, and the parallel setting can make the two lips subject to an extrusion force parallel to the lip seals, so that the fit is more firm and stable, and the sealing performance is more reliable.

[0051] Example 3

[0052] Based on the same inventive concept, the arc-shaped airtight zipper provided in this embodiment is basically the same as that in Embodiment 1. For the sake of brevity, in the description of this embodiment, the same technical features as those in Embodiment 1 are no longer described, and only the differences between this embodiment and Embodiment 1 are described:

[0053] like Figure 4 As shown, the outer chain tooth 11 and the inner chain tooth 21 are respectively W-shaped structures formed by connecting two U-shaped structures; the two ends of the two U-shaped structures arranged opposite to each other are respectively fixed ends, and the two connected ends are respectively sealing ends; the two sealing ends 11b of the outer chain tooth 11 are both embedded in the first lip seal 12, and the two sealing ends 21b of the inner chain tooth 21 are both embedded in the second lip seal 22.

[0054] The W-shaped structure is composed of two U-shaped structures connected together, and has the advantages of the U-shaped structure in Example 2. At the same time, the W-shaped structure provides two sets of chain tooth bite structures. On the one hand, it can make the two lip-shaped sealing lips and the chain teeth more firmly connected. On the other hand, the two sets of chain teeth have better bite sealing performance.

[0055] Example 4

[0056] Based on the same inventive concept, the arc-shaped airtight zipper provided in this embodiment is basically the same as that in Embodiment 1. For the sake of brevity, in the description of this embodiment, the same technical features as those in Embodiment 1 are no longer described, and only the differences between this embodiment and Embodiment 1 are described:

[0057] The arc-shaped airtight zipper of the embodiment of the utility model also includes: a head 4; the outer chain 1 and the inner chain 2 respectively have a starting end and a terminal end, the starting end 1a of the outer chain is fitted and fixedly sealed with the starting end 2a of the inner chain, and the terminal end 1b of the outer chain is sealed with the terminal end 2b of the inner chain through the head 4.

[0058] like Figure 1 As shown, the first lip seal 12 and the second lip seal 22 at the starting ends of the outer chain 1 and the inner chain 2 are connected as a whole, so that the starting ends form sealed ends. The first lip seal 12 and the second lip seal 22 are connected and sealed by the head 4, and the terminal 1b of the outer chain and the terminal 2b of the inner chain are sealed through the head 4, so that the two terminal seals of the zipper 100 are realized.

[0059] Example 5

[0060] Figure 8 A schematic diagram of the front view structure of a sealing head of an arc-shaped airtight zipper of the utility model is given;

[0061] Fig. 9 A schematic diagram of the top view of the sealing head of an arc-shaped airtight zipper of the utility model is given.

[0062] Based on the same inventive concept, the arc-shaped airtight zipper provided in this embodiment is basically the same as that in Embodiment 1. For the sake of brevity, in the description of this embodiment, the same technical features as those in Embodiment 1 are no longer described, and only the differences between this embodiment and Embodiment 1 are described:

[0063] The utility model embodiment provides a specific structure of a head 4, such as Figure 8 and Fig. 9 As shown, the sealing head 4 includes: two end portions 41 arranged opposite to each other, and a connecting portion 42 elastically connecting the two end portions 41; the two end portions 41 are respectively connected to the first lip seal 12 and the second lip seal 22; the two end portions 41 can be inserted into the slide groove 311 and slide relative to the zipper head 3 when being pulled together, and the outlets 311b are respectively inserted into one of the chain entrances 311a after the chain is engaged and are sealed and fitted with the chain entrances 311a.

[0064] The connecting part 42 is made of elastic material, which can make the two ends 41 close together when subjected to extrusion force, and open when the external extrusion force is released. When the zipper head 3 is pulled to the terminal, the two ends 41 are inserted into the slide groove 311 from the chain bite rear outlet 311b, and when sliding to the chain entrance 311a, the two ends 41 are respectively inserted into a chain entrance 311a, and are squeezed by the groove wall of the chain entrance 311a, and are closely attached to the chain entrance 311a, so as to realize the side sealing of the terminal 1b of the outer chain and the terminal 2b of the inner chain.

[0065] Furthermore, if Figure 8 and Fig. 9 As shown, the connection portions between the connection portion 42 and the two end portions 41 respectively have outer protrusions 421 , and the slide groove 311 has convex grooves correspondingly engaged with the outer protrusions 421 .

[0066] There are outer protrusions 421 on both sides of the connecting portion 42, which form a bottle-like structure with the two end portions 41. The slide groove 311 is designed to match the shape of the head 4. When the head 4 is inserted into the slide groove 311 as a whole, the outer protrusion 421 is squeezed and tightened by the groove wall, thereby realizing the upper and lower surface sealing of the terminal 1b of the outer chain and the terminal 2b of the inner chain.

[0067] By sealing the sides and the top and bottom surfaces of the terminal 1b of the outer chain and the terminal 2b of the inner chain, the terminal of the zipper 100 can be fully sealed.

[0068] Example 6

[0069] Figure 7 A schematic diagram of the overall structure of a zipper head of an arc-shaped airtight zipper of the utility model is given.

[0070] Based on the same inventive concept, the arc-shaped airtight zipper provided in this embodiment is basically the same as that in Embodiment 1. For the sake of brevity, in the description of this embodiment, the same technical features as those in Embodiment 1 are no longer described, and only the differences between this embodiment and Embodiment 1 are described:

[0071] The utility model embodiment provides a specific structure of a head 4, such as Figure 7 As shown, the zipper head 3 includes a slider body 31 , a pull handle 33 , and a movable connecting member 32 connecting the slider body 31 and the pull handle 33 .

[0072] Furthermore, the movable connecting member 32 includes a pull ring 321 and a pull belt 322 connecting the pull ring 321 and the pull handle 33 ; a connecting ring 313 is provided on the slider body 31 , and the pull ring 321 is sleeved with the connecting ring 313 .

[0073] The zipper head 3 can slide relative to the outer chain 1 and the inner chain 2 through the pull handle 33. The pull handle 33 can be designed to be long and easy to grasp when opening and closing the zipper 100.

[0074] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. An arc-shaped airtight zipper, characterized in that: The zipper comprises: The outer chain comprises a first sealing belt, a first lip seal fixed to one side of the first sealing belt, and a plurality of outer chain teeth arranged side by side and having sealing ends and fixed ends; An inner chain, comprising a second sealing belt, a second lip seal fixed to one side of the second sealing belt, and a plurality of inner chain teeth arranged side by side and having sealing ends and fixed ends; A zipper head having a slide groove inside, one end of the slide groove having two separate chain entrances which merge inside to form a chain bite outlet at the other end, the fixed ends of the outer chain teeth and the inner chain teeth can enter the slide groove by pulling the zipper head, and slide relative to the zipper head between one of the chain entrances and the chain bite outlet to engage with or separate from each other; When pulled together and bitten, the lip of the first lip seal and the lip of the second lip seal fit each other and seal; The outer chain and the inner chain respectively have an arc section, and in the arc section, the distance between two adjacent outer chain teeth is greater than the distance between two adjacent inner chain teeth.

2. The arc-shaped airtight zipper according to claim 1, characterized in that: The outer chain teeth and the inner chain teeth are respectively U-shaped structures; The two opposite ends of the U-shaped structure are the sealing end and the fixed end respectively; the sealing end of the outer chain tooth is embedded in the first lip seal, and the sealing end of the inner chain tooth is embedded in the second lip seal.

3. The arc-shaped airtight zipper according to claim 1, characterized in that: The outer chain teeth and the inner chain teeth are respectively W-shaped structures formed by connecting two U-shaped structures; The two ends of the two U-shaped structures that are opposite to each other are fixed ends, and the two connected ends are sealing ends; the two sealing ends of the outer chain teeth are embedded in the first lip seal, and the two sealing ends of the inner chain teeth are embedded in the second lip seal.

4. The arc-shaped airtight zipper according to claim 1, characterized in that: The outer chain and the inner chain each further have at least one straight section connected to the arc section, and in the straight section, the spacing between two adjacent outer chain teeth and the spacing between two adjacent inner chain teeth are equal.

5. The arc-shaped airtight zipper according to claim 1, characterized in that: The zipper also includes: a head; The outer chain and the inner chain have a starting end and a terminal end respectively. The starting end of the outer chain is fixedly sealed with the starting end of the inner chain, and the terminal end of the outer chain is sealed with the terminal end of the inner chain through the head.

6. The arc-shaped airtight zipper according to claim 5, characterized in that: The sealing head comprises: two ends arranged opposite to each other, and a connecting portion elastically connecting the two ends; The two end portions are respectively connected to the first lip seal and the second lip seal; the two end portions can be inserted into the slide groove and slide relative to the zipper head when pulled and closed, and the outlets are respectively inserted into one of the chain entrances after the chain is engaged and sealed with the chain entrance.

7. The arc-shaped airtight zipper according to claim 6, characterized in that: The connection parts between the connection part and the two end parts respectively have outer protrusions, and the slide groove has a convex groove correspondingly engaged with the outer protrusions.

8. The arc-shaped airtight zipper according to claim 1, characterized in that: The first lip seal and the second lip seal are elastic bodies, and the lips of the two are bending structures that can be spliced ​​and sealed with each other.

9. The arc-shaped airtight zipper according to claim 1, characterized in that: The zipper head comprises a slider body, a pull handle and a movable connecting piece connecting the slider body and the pull handle.

10. The arc-shaped airtight zipper according to claim 9, characterized in that: The movable connecting member comprises a pull ring and a pull belt connecting the pull ring and the pull handle; a connecting ring is arranged on the pull head body, and the pull ring is sleeved with the connecting ring.

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