Gas one-way valve with high sealing performance

Abstract

The gas one-way valve comprises an upper valve body, a lower valve body and a blocking piece, the bottom face of the upper valve body is provided with a concave cavity, the periphery of the lower valve body is provided with an embedding part, the embedding part is embedded with a lower opening of the concave cavity so that a sealing cavity can be formed between the concave cavity and the lower valve body, the blocking piece is arranged on the lower valve body, and the blocking piece is arranged on the lower valve body. A cavity is formed in the upper valve body, a pressing mechanism is arranged in the position, on the cavity, of the interior of the upper valve body, an air outlet valve opening communicated with the cavity is formed in the top face of the upper valve body, an exhaust valve opening communicated with the cavity is formed in the lower valve body, and the pressing mechanism makes partial contact with the blocking piece. The outer edge of the blocking piece is pushed by air in the packaging bag to bend upwards, so that the exhaust valve port is opened, the air in the packaging bag is exhausted into the sealed cavity, and when the internal pressure of the packaging bag is smaller than the external air pressure, the blocking piece resets to close the exhaust valve port. The utility model has the advantages of simple structure, high sealing performance, no need of any mechanical fixation and more convenience in assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of one-way valves, in particular to a gas one-way valve with high sealing performance. Background Art

[0002] Packages made of flexible materials are often used to store products to isolate them from the ambient air. Such stored products may be agricultural products, food, chemicals, etc. It is common practice for flexible packaging to include various valves to allow air that may be trapped in the bag or gases generated by the bag's contents to escape from the bag through the valve. For example, a one-way exhaust valve for aluminum-plastic composite bags is disclosed in China Utility Model Patent Publication No. CN205298684U. The structure includes a valve seat, a valve plate and a valve cover, wherein an inwardly extending seat ring is formed in the middle of the valve seat, and the valve cover is embedded in the valve seat from the rear of the valve seat and is sealed and fixedly connected to the seat ring, so that the valve cover and the valve seat are combined to form a cavity, and exhaust holes are provided on the valve cover and the seat ring, and the exhaust holes are connected to the cavity, the valve plate is placed in the cavity, and a sealing oil layer is coated on one side of the valve plate. In this structure, the valve plate is not constrained in the cavity. When the valve body is inverted, the valve plate in the cavity cannot fit with the seat ring under the action of its own weight, and the air entering from the outside cannot push the valve plate to fit with the seat ring, which easily causes external air to enter the packaging bag from the gap between the valve plate and the inner wall of the cavity, greatly reducing the sealing inside the packaging bag.

[0003] In addition, regarding the one-way exhaust valve with Chinese utility model patent publication number CN202733066U, the structure discloses an exhaust valve composed of a valve seat, a self-sealing valve plate and a valve cover. The self-sealing valve plate is a plate-shaped structure with a cross-shaped opening in the center of the self-sealing valve plate. The self-sealing valve plate is arranged between the valve seat air inlet hole of the valve seat and the positioning ring of the valve cover. The valve seat and the central positioning ring at the bottom of the valve cover are snap-fitted to fix the self-sealing valve plate. Most of the area of ​​the cross-shaped opening of the self-sealing valve plate in this structure is blocked by the valve seat, resulting in only a small part of the cross-shaped opening being connected to the valve seat air inlet. This method greatly reduces the exhaust efficiency of the one-way exhaust valve. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the utility model is to provide a highly sealed gas one-way valve with a simple structure and high sealing performance, without any mechanical fixation, and more convenient assembly.

[0005] In order to achieve the above-mentioned purpose, the utility model discloses a highly sealed gas one-way valve, comprising an upper valve body, a lower valve body, and a barrier sheet, wherein the bottom surface of the upper valve body has a concave cavity, the peripheral edge of the lower valve body is provided with a fitting portion, the fitting portion is fitted with the lower opening of the concave cavity, so that a sealed cavity is formed between the concave cavity and the lower valve body, the barrier sheet is placed on the lower valve body, and the interior of the upper valve body is provided with a pressing mechanism on the concave cavity, the top surface of the upper valve body is provided with an outlet valve port communicating with the sealed cavity, and the lower valve body is provided with a There is an exhaust valve port connected to the sealed cavity, the clamping mechanism is in partial contact with the barrier sheet to close it on the exhaust valve port, and the bottom surface of the lower valve body has a concave position, and a filter breathable membrane is arranged in the concave position. When the internal pressure of the packaging bag is greater than the external air pressure, the outer edge of the barrier sheet is pushed upward by the air in the packaging bag to open the exhaust valve port, so that the internal air of the packaging bag is discharged into the sealed cavity. When the internal pressure of the packaging bag is less than the external air pressure, the barrier sheet is reset to close the exhaust valve port.

[0006] Furthermore, the engaging portion includes an annular circumferential wall, which is arranged on the circumferential edge of the lower valve body, and the annular circumferential wall is gradually inclined outward from bottom to top.

[0007] Furthermore, the lower inner wall of the cavity has an annular groove matching the shape of the annular circumferential wall, so that the annular circumferential wall is engaged with the annular groove.

[0008] Through the above arrangement, the lower valve body is not easy to separate after being embedded in the upper valve body, and no mechanical fixing method is required, which greatly reduces the production cost and facilitates assembly.

[0009] Furthermore, the clamping mechanism includes a plurality of pressing plates, which are located between any adjacent exhaust valve ports and are equidistantly arranged in the concave cavity along the circumferential direction.

[0010] Furthermore, the outer diameter of the barrier sheet is smaller than the inner diameter of the annular circumferential wall, so that an exhaust gap is formed between the outer wall of the barrier sheet and the inner wall of the annular circumferential wall, so that when the outer edge of the barrier sheet is lifted up and bent upward by the internal pressure of the packaging bag, the air inside the packaging bag can flow into the sealed cavity through the exhaust gap.

[0011] Furthermore, a plurality of air holes are provided on the surface of the filter breathable membrane corresponding to the exhaust valve port, which can not only allow the air in the packaging bag to be discharged normally, but also filter the debris in the packaging bag to prevent the debris from entering the sealed cavity or being retained in the gap between the barrier piece 22 and the lower valve body 2.

[0012] Furthermore, a boss is provided at the center of the lower valve body, and a center hole matching the boss is provided at the center of the barrier sheet, so that the boss is used to position the barrier sheet to ensure that the barrier sheet can cover several exhaust valve openings, thereby blocking the interior of the packaging bag from contacting the outside air.

[0013] Furthermore, the plurality of air outlet valve ports and the plurality of exhaust valve ports are equidistantly arranged along the circumferential direction, thereby accelerating the flow of air.

[0014] Furthermore, the barrier sheet is made of silicone.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] (1) In the utility model, the upper valve body and the lower valve body cooperate with each other by using inclined surfaces, without any mechanical fixing method, which not only makes the structure simpler, reduces production costs, but also makes assembly more convenient. (2) A pressing piece that partially contacts the barrier piece is provided on the upper valve body, which can prevent the barrier piece from shifting, and the barrier piece is in close contact with the surface of the lower valve body, which greatly improves the sealing effect of the one-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an exploded view of the overall structure of the first embodiment;

[0018] Figure 2 It is a schematic diagram of the overall structure of the first embodiment;

[0019] Figure 3 It is the overall structural state diagram I of the first embodiment;

[0020] Figure 4 It is the overall structural state diagram II of the embodiment 1;

[0021] Figure 5 It is a schematic diagram of the overall structure in the second embodiment;

[0022] Figure 6 It is a half-section view of the overall structure in the second embodiment. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0024] Embodiment 1:

[0025] Reference Figure 1-Figure 3As shown, a highly sealed gas one-way valve comprises an upper valve body 1, a lower valve body 2 and a barrier sheet 3. The bottom surface of the upper valve body 1 has a concave cavity 11, and the circumference of the lower valve body 2 is provided with a fitting portion 21, which fits with the lower opening of the concave cavity 11 to form a sealed cavity 4 between the concave cavity 11 and the lower valve body 2. The top surface of the upper valve body 1 is provided with a plurality of air outlet valve ports 12 communicating with the concave cavity 11, and the lower valve body 2 is provided with a plurality of exhaust valve ports 22 communicating with the concave cavity 11. In this embodiment, the plurality of air outlet valve ports 12 and the exhaust valve ports 22 are equidistantly arranged in the circumferential direction, and a flange is provided on the circumferential wall of the upper valve body 1, which is heat-sealed to the surface of the packaging bag, and an air vent communicating with the exhaust valve port 22 is provided on the surface to allow air in the packaging bag to pass through the packaging bag. The air can be discharged into the sealed cavity 4 through the exhaust valve port 22, and in order to prevent the outside air from entering the packaging bag, a convex column 23 is arranged at the center of the lower valve body 2, and the barrier sheet 3 is placed on the lower valve body 2. The center of the barrier sheet 3 has a central hole 31 matching the convex column 23, so that the central hole 31 of the barrier sheet 3 is placed on the convex column 23, and the convex column 23 is used to position the barrier sheet 3 to ensure that the barrier sheet 3 can cover a number of exhaust valve ports 22, thereby blocking the inside of the packaging bag from contacting the outside air. In this embodiment, the barrier sheet 3 is preferably made of silicone, and a clamping mechanism 5 is arranged on the concave cavity 11 inside the upper valve body 1, and the clamping mechanism 5 is in partial contact with the barrier sheet 3, so that the barrier sheet 3 is closed on the exhaust valve port 22 of the lower valve body 2.

[0026] Reference Figure 1 , Figure 3 As shown, further, the fitting portion 21 includes an annular circumferential wall 211, which is arranged on the circumferential edge of the lower valve body 2, and the annular circumferential wall 211 is gradually inclined outward from bottom to top, and the lower inner wall of the concave cavity 11 has an annular groove 111 matching the shape of the annular circumferential wall 211, and the annular circumferential wall 211 is fitted with the annular groove 111, so that the inclined surfaces between the annular circumferential wall 211 and the annular groove 111 cooperate with each other, so that the lower valve body 2 is fixed on the upper valve body 1 without any mechanical connection, so that the structure is simpler, the assembly is more convenient, and the production cost is greatly reduced.

[0027] The clamping mechanism 5 includes a plurality of pressing plates 51, which are located between the upper parts of any adjacent exhaust valve ports 22 and are equidistantly arranged in the concave cavity 11 along the circumferential direction. In this embodiment, the spacing between the pressing plates 51 and the lower valve body 2 is equivalent to the thickness of the barrier plate 3, so that after the lower valve body 2 is covered on the upper valve body 1, the plurality of pressing plates 51 are in conflict with the upper surface of the barrier plate 3, thereby blocking the exhaust valve port 22 from being connected to the sealed cavity 4, preventing the barrier plate 3 from shifting in the sealed cavity 4, causing the exhaust valve port 22 to be connected to the sealed cavity 4, and the outside air in the sealed cavity 4 will enter the interior of the packaging bag through the exhaust valve port 22, thereby greatly improving the sealing effect.

[0028] Combination Figure 3 , Figure 4 As shown, further, the outer diameter of the barrier sheet 3 is smaller than the inner diameter of the annular peripheral wall 211, so that an exhaust gap 32 is formed between the outer wall of the barrier sheet 3 and the inner wall of the annular peripheral wall 211. When the air in the packaging bag enters the exhaust valve port 22, when the internal pressure of the packaging bag is greater than the external air pressure, since the plurality of pressing sheets 51 and the plurality of exhaust valve ports 22 in this embodiment are relatively staggered, the outer edge of the barrier sheet 3 is bent upward under the push of the air in the packaging bag, thereby opening the exhaust valve port 22, and a exhaust gap 32 communicating with the exhaust gap 32 is formed between the barrier sheet 3 and the surface of the lower valve body 2. The pressure gap 33 is closed, so that the air in the packaging bag enters the exhaust gap through the pressure relief gap 33, thereby discharging the air in the packaging bag into the sealed cavity 4 and out to the outside through the air outlet valve port 12. When the internal pressure of the packaging bag is lower than the external air pressure, the periphery of the barrier sheet 3 recovers under the action of its own elasticity. At this time, the pressure relief gap 33 is closed, so that the exhaust valve port 22 is no longer connected to the sealed cavity 4, thereby closing the exhaust valve port 22, thereby blocking the inside of the packaging bag from being connected to the outside, preventing external air from entering the packaging bag, effectively preventing the food in the packaging bag from getting damp, and extending the shelf life of the food.

[0029] Embodiment 2:

[0030] Reference Figure 5 , Figure 6 As shown, the difference between this embodiment and the first embodiment is that the bottom surface of the lower valve body 2 has a recess 24, and a filter breathable membrane 25 is arranged in the recess 24. In this embodiment, the filter breathable membrane 25 is preferably made of silicone material, and a limiting flange is arranged on the inner wall of the recess 24, so that the limiting flange cooperates with the outer peripheral limiting of the filter breathable membrane 25. When the flange of the upper valve body 1 is heat-sealed with the surface of the packaging bag, the filter breathable membrane 25 is sealed in the recess 24 of the lower valve body 2, and a filter breathable membrane 25 is arranged between the recess 24 and the packaging bag. In this embodiment, a plurality of air holes 251 are arranged on the surface of the filter breathable membrane 25 corresponding to the exhaust valve port 22, so that the filter breathable membrane 25 can not only discharge the air in the packaging bag normally, but also filter the debris in the packaging bag to prevent the debris in the packaging bag from entering the sealed cavity or being retained in the gap between the barrier sheet 3 and the lower valve body 2, thereby greatly improving the sealing performance of the one-way valve.

[0031] Of course, the above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. Any modifications made according to the spirit of the main technical scheme of the utility model should be included in the protection scope of the utility model.

Claims

1. A highly sealing gas one-way valve, characterized in that: The invention comprises an upper valve body (1), a lower valve body (2), and a barrier sheet (3), wherein the bottom surface of the upper valve body (1) has a concave cavity (11), the circumference of the lower valve body (2) is provided with a fitting portion (21), the fitting portion (21) is fitted with the lower opening of the concave cavity (11), so that a sealed cavity (4) is formed between the concave cavity (11) and the lower valve body (2), the barrier sheet (3) is placed on the lower valve body (2), and a pressing mechanism (5) is provided inside the upper valve body (1) on the concave cavity (11), the top surface of the upper valve body (1) is provided with a plurality of air outlet valve ports (12) connected to the sealed cavity (4), and the lower valve body (2) is provided with a plurality of air outlet valve ports (12) connected to the sealed cavity (4). The sealing cavity (4) is connected to a plurality of exhaust valve openings (22), the pressing mechanism (5) is in partial contact with the barrier sheet (3) so that it is closed on the exhaust valve openings (22), and the bottom surface of the lower valve body (2) has a concave position (24), and a filter air-permeable membrane (25) is arranged in the concave position (24). When the internal pressure of the packaging bag is greater than the external air pressure, the outer edge of the barrier sheet (3) is pushed upward by the air in the packaging bag to open the exhaust valve opening (22), so that the internal air of the packaging bag is discharged into the sealing cavity (4); when the internal pressure of the packaging bag is less than the external air pressure, the barrier sheet (3) is reset to close the exhaust valve opening (22).

2. A highly airtight gas one-way valve according to claim 1, characterized in that: The fitting portion (21) comprises an annular circumferential wall (211), the annular circumferential wall (211) being arranged on the circumferential edge of the lower valve body (2), and the annular circumferential wall (211) being arranged to be gradually inclined outwards from bottom to top.

3. A highly sealed gas one-way valve according to claim 2, characterized in that: The lower inner wall of the concave cavity (11) has an annular groove (111) that matches the shape of the annular peripheral wall (211), so that the annular peripheral wall (211) is embedded in the annular groove (111).

4. A highly sealed gas one-way valve according to claim 1, characterized in that: The pressing mechanism (5) comprises a plurality of pressing plates (51), wherein the pressing plates (51) are located between any adjacent exhaust valve ports (22) and are arranged in the concave cavity (11) at equal intervals along the circumferential direction.

5. A highly sealed gas one-way valve according to claim 2, characterized in that: The outer diameter of the barrier sheet (3) is smaller than the inner diameter of the annular peripheral wall (211), so that an exhaust gap (32) is formed between the outer wall of the barrier sheet (3) and the inner wall of the annular peripheral wall (211).

6. A highly airtight gas one-way valve according to claim 1, characterized in that: A plurality of air holes (251) are provided on the surface of the filter air permeable membrane (25) corresponding to the exhaust valve port (22).

7. A highly airtight gas one-way valve according to claim 1, characterized in that: A convex column (23) is provided at the center of the lower valve body (2), and a central hole (31) matching the convex column (23) is provided at the center of the barrier sheet (3).

8. A highly airtight gas one-way valve according to claim 1, characterized in that: The plurality of air outlet valve openings (12) and the plurality of exhaust valve openings (22) are arranged at equal intervals along the circumferential direction.

9. A highly airtight gas one-way valve according to claim 1, characterized in that: The barrier sheet (3) and the filter air-permeable membrane (25) are made of silica gel.

Images