Sealing structure of multi-track airtight zipper

Abstract

A sealing structure of a multi-track airtight zipper comprises a first zipper belt and a second zipper belt, the first zipper belt is provided with a first sealing part, the second zipper belt is provided with a second sealing part, and the first sealing part is provided with two limiting hooks and at least one first hook and forms at least two first tracks; the second sealing part is provided with at least two second hooks and forms a second track, barbs are arranged on the inner side of the limiting hook, the two sides of the first hook in the thickness direction and the two sides of the second hooks in the thickness direction, and the two barbs of the first hook are connected with the barbs of the two second hooks respectively; and the barb of the limiting hook is jointed with the barb on the outer side of the second hook. When the sealing structure is closed, as the first hook and the second rail as well as the second hook and the first rail are fixed in a barb joint mode, Z-shaped sealing lines can be formed at a plurality of joints, so that the sealing effect is greatly improved, and the high air tightness requirement is met.

Description

Technical Field

[0001] The invention relates to a zipper, in particular to a sealing structure of a multi-track airtight zipper. Background Art

[0002] An airtight zipper can be waterproof and isolate air. In order to solve the problem that the two chain belts of a traditional airtight zipper are easily subjected to external forces and slide and misalign with each other, Chinese utility model CN212545911U discloses a waterproof and airtight zipper. The zipper is provided with a first sealing protrusion and a second sealing protrusion of different shapes. The first sealing protrusion and the second sealing protrusion cooperate with the first sealing groove and the second sealing groove respectively, thereby forming two sealing structures, which have a stronger anti-sliding and misalignment function.

[0003] However, the inner surfaces of the first sealing groove and the second sealing groove of the waterproof and airtight zipper are relatively smooth, and the resistance to gas is insufficient, and thus the airtightness requirement cannot be met. Summary of the invention

[0004] The technical solution of the present invention is aimed at the above situation. In order to solve the above problem, a sealing structure of a multi-track airtight zipper is provided. The sealing structure includes: a first chain belt and a second chain belt, the first chain belt has a first belt portion and a first sealing portion, the first belt portion is connected to the first sealing portion, the second chain belt has a second belt portion and a second sealing portion, the second belt portion is connected to the second sealing portion, the first sealing portion has two limiting hooks and at least one first hook, the first hook is located between the two limiting hooks along a thickness direction to form at least two first tracks, the second sealing portion has at least two second hooks, and a second track is formed between two adjacent second hooks, the inner side of the limiting hook, both sides of the first hook along the thickness direction, and both sides of the second hook along the thickness direction are all provided with barbs, a single first hook is inserted into a single second track, a single second hook is inserted into a single first track, the two barbs of the first hook are respectively engaged with the barbs of the two second hooks, and the barb of the limiting hook is engaged with the barb on the outer side of the second hook.

[0005] Furthermore, the second sealing portion also has two baffles, which are respectively located on the outsides of the two second hooks, and the two limiting hooks are respectively in contact with the two baffles.

[0006] Further, the outer side depth of the first track adjacent to the limiting hook is smaller than the inner side depth, and the outer side barb of the second hook engaged with the limiting hook is farther away from the second belt portion than the inner side barb.

[0007] Furthermore, two inner angles of the first track are 60-65°, and two inner angles of the second track are 65-70°.

[0008] Further, the first hook forms an interference fit with the second track, and the second hook forms an interference fit with the first track.

[0009] Furthermore, the extrusion depth of the first track is 1.13-1.19 mm, the extrusion depth of the second track is 1.12-1.18 mm, the extrusion width of the first hook is 1.19-1.25 mm, and the extrusion width of the second hook is 1.22-1.28 mm.

[0010] Furthermore, the extruded thickness of the first rail is 1.69-1.75 mm, the extruded thickness of the second rail is 1.67-1.73 mm, the extruded thickness of the first hook is 1.73-1.79 mm, and the extruded thickness of the second hook is 1.72-1.78 mm.

[0011] After adopting the above technical solution, the beneficial effect of the present invention is: when the above sealing structure is closed, since the first hook and the second rail as well as the second hook and the first rail are fixed by means of barb joints, Z-shaped sealing lines can be formed at multiple joints, thereby greatly improving the sealing effect to meet higher airtightness requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of a multi-track airtight zipper according to the present invention;

[0013] Figure 2 A schematic diagram of the sealing structure of the present invention in a closed state;

[0014] Figure 3 It is a schematic diagram of the sealing structure involved in the present invention in an open state. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is further described below by way of embodiments:

[0016] The present invention provides a sealing structure of a multi-track airtight zipper, combined with Figures 1 to 3As shown, the sealing structure includes: a first chain belt 1 and a second chain belt 2, the first chain belt 1 has a first belt portion 11 and a first sealing portion 12, the first belt portion 11 is connected to the first sealing portion 12, the second chain belt 2 has a second belt portion 21 and a second sealing portion 22, the second belt portion 21 is connected to the second sealing portion 22, the first sealing portion 12 has two limiting hooks 121 and at least one first hook 122, the first hook 122 is located between the two limiting hooks 121 along a thickness direction 100 to form at least two first tracks 120, the second sealing portion 22 has at least two second hooks 221, and the second track 220 is formed between two adjacent second hooks 221, the inner side of the limiting hook 121 (i.e., the side close to the horizontal midline L of the first chain belt 1, the same below), the two sides of the first hook 122 along the thickness direction 100 (i.e., Figure 2 The upper and lower sides of the first hook 122 and the second hook 221 have barbs on both sides along the thickness direction 100, a single first hook 122 is inserted into a single second rail 220, a single second hook 221 is inserted into a single first rail 120, the two barbs of the first hook 122 are respectively engaged with the barbs of the two second hooks 221, and the barb of the limiting hook 121 is engaged with the barb on the outside of the second hook 221.

[0017] In addition to the above sealing structure, the multi-track airtight zipper also includes a zipper head, and the sealing structure can be closed or opened by pulling the zipper head. When the above sealing structure is closed, since the first hook 122 and the second track 220 and the second hook 221 and the first track 120 are fixed by barb joint, Z-shaped sealing lines can be formed at multiple joints, thereby greatly improving the sealing effect to meet higher airtightness requirements.

[0018] In this embodiment, there are one first hook 122 and one second track 220, and two second hooks 221 and two first tracks 120. In other embodiments, there may be more than two first hooks 122 and more than two second tracks 220, and three or more second hooks 221 and more than three first tracks 120.

[0019] As a preferred solution, please continue to refer to Figure 2 As shown, the second sealing portion 22 also has two baffles 222, which are respectively located outside the two second hooks 221, and the two limiting hooks 121 are respectively abutted against the two baffles 222. A sealing line is also formed at the abutment between the limiting hooks 121 and the baffles 222, thereby further improving the sealing effect.

[0020] As a preferred solution, the outer depth of the first rail 120 adjacent to the limit hook 121 is less than the inner depth, and the outer barb of the second hook 221 engaged with the limit hook 121 is farther away from the second belt portion 21 than the inner barb. That is, the two first rails 120 located on the outermost side are narrow on the outside and wide on the inside, and correspondingly, the two second hooks 221 located on the outermost side are also narrow on the outside and wide on the inside. Of course, in this embodiment, since there are two first rails 120 and two second hooks 221, the two first rails 120 and the two second hooks 221 both meet the above structure. Among them, when the first belt portion 11 and the second belt portion 21 are pulled by two pulling forces F in opposite directions, since the outer depth of the first track 120 adjacent to the limiting hook 121 is smaller than the inner depth, and the outer hook of the second hook 221 engaged with the limiting hook 121 is farther away from the second belt portion 21 than the inner hook, the force arm of the limiting hook 121 (i.e., the distance between the tip of the hook and the center line M of the track end surface, the same below) is smaller than the force arm of the first hook 122. Under the action of the two pulling forces F, the second hook 221 engaged with the limiting hook 121 will be squeezed inwardly along the direction of the arrow S, thereby making the first hook 122 and the second track 220 fit more closely, which can prevent the sealing structure from being opened on the one hand, and continue to maintain the airtight effect on the other hand.

[0021] In the present invention, the two inner angles α of the first track 120 and the two inner angles β of the second track 220 are both greater than 0° and less than or equal to 90°, so as to form a barb shape. As a preferred solution, please continue to refer to Figure 3 As shown, the two inner angles α of the first track 120 are 60-65°, and the two inner angles β of the second track 220 are 65-70°. The inner angle α of the first track 120 is the hook angle of the limit hook 121 or the first hook 122, and the inner angle β of the second track 220 is the hook angle of the second hook 221. Setting the above angles can ensure the sealing effect while allowing the zipper head to smoothly open the sealing structure.

[0022] As a preferred solution, the first hook 122 forms an interference fit with the second track 220, and the second hook 221 forms an interference fit with the first track 120. The interference fit between the hook and the track can further improve air tightness.

[0023] Specifically, the extrusion depth D1 of the first track 120 is 1.13-1.19 mm, the extrusion depth D2 of the second track 220 is 1.12-1.18 mm, the extrusion width W1 of the first hook 122 is 1.19-1.25 mm, and the extrusion width W2 of the second hook 221 is 1.22-1.28 mm. The extrusion depth refers to the vertical distance from the center line M of the end face of the track to the inner corner farthest from the end face; the extrusion width refers to the vertical distance from the center line N of the end face of the hook to the tip of the barb farthest from the end face. After closing, the end face of the hook abuts against the end face of the track, and the tip of the barb is located at the inner corner of the track. The above-mentioned size setting can form an interference fit between the hook and the track in the width direction 200.

[0024] Specifically, the extrusion thickness of the first track 120 is 1.69-1.75 mm, the extrusion thickness of the second track 220 is 1.67-1.73 mm, the extrusion thickness of the first hook 122 is 1.73-1.79 mm, and the extrusion thickness of the second hook 221 is 1.72-1.78 mm. The extrusion thickness of the track refers to the vertical distance between the two inner corners of the track, and the extrusion thickness of the hook refers to the vertical distance between the two barb tips of the hook.

Claims

1. A sealing structure of a multi-track airtight zipper, the sealing structure comprising: A first chain belt and a second chain belt, the first chain belt has a first belt portion and a first sealing portion, the first belt portion is connected to the first sealing portion, the second chain belt has a second belt portion and a second sealing portion, the second belt portion is connected to the second sealing portion, the first sealing portion has two limiting hooks and at least one first hook, the first hook is located between the two limiting hooks along a thickness direction to form at least two first tracks, the second sealing portion has at least two second hooks, and a second track is formed between two adjacent second hooks, characterized in that: the inner side of the limiting hook, both sides of the first hook along the thickness direction, and both sides of the second hook along the thickness direction are all provided with barbs, a single first hook is inserted into a single second track, a single second hook is inserted into a single first track, the two barbs of the first hook are respectively engaged with the barbs of the two second hooks, and the barb of the limiting hook is engaged with the barb on the outer side of the second hook.

2. The sealing structure of the multi-track airtight zipper according to claim 1, characterized in that: The second sealing portion further has two baffles, which are respectively located on the outsides of the two second hooks, and the two limiting hooks are respectively in contact with the two baffles.

3. The sealing structure of the multi-track airtight zipper according to claim 1, characterized in that: The outer depth of the first track adjacent to the limiting hook is smaller than the inner depth, and the outer barb of the second hook engaged with the limiting hook is farther away from the second belt portion than the inner barb.

4. The sealing structure of the multi-track airtight zipper according to claim 1, characterized in that: The two inner angles of the first track are 60-65 degrees, and the two inner angles of the second track are 65-70 degrees.

5. The sealing structure of the multi-track airtight zipper according to claim 1, characterized in that: The first hook forms an interference fit with the second track, and the second hook forms an interference fit with the first track.

6. The sealing structure of the multi-track airtight zipper according to claim 5, characterized in that: The extrusion depth of the first track is 1.13-1.19 mm, the extrusion depth of the second track is 1.12-1.18 mm, the extrusion width of the first hook is 1.19-1.25 mm, and the extrusion width of the second hook is 1.22-1.28 mm.

7. The sealing structure of the multi-track airtight zipper according to claim 5, characterized in that: The extrusion thickness of the first track is 1.69-1.75 mm, the extrusion thickness of the second track is 1.67-1.73 mm, the extrusion thickness of the first hook is 1.73-1.79 mm, and the extrusion thickness of the second hook is 1.72-1.78 mm.

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