Disposable meal box cover with exhaust leakage-proof structure

Abstract

The utility model discloses a disposable lunch box cover with an exhaust leakage-proof structure, which belongs to the technical field of disposable lunch boxes and comprises a cover body, a buckling edge is arranged on the edge of the cover body, a clamping seat is arranged on the cover body, a clamping block is arranged in the clamping seat, a positioning hole is further formed in the clamping seat, an exhaust pipe is communicated with the clamping block, and the exhaust pipe is communicated with the cover body. A lateral channel communicated with the exhaust pipe is arranged in the clamping block, a micro-gap channel exists between the clamping block and the clamping seat after installation, the liquid leakage amount is smaller than or equal to 0.1 mL / min through the cooperation of the micro-gap channel and the lateral channel under the synergistic effect of a gap of 0.3 mm and the channel radius of 1.5 mm, and through the arranged threaded flow guide groove, the liquid leakage amount is smaller than or equal to 0.1 mL / min. And the liquid backflow speed can be greatly increased.

Description

Technical Field

[0001] This utility model relates to the field of disposable lunch box technology, specifically a disposable lunch box lid with an exhaust and leak-proof structure. Background Technology

[0002] Disposable food containers are designed to meet the needs of convenient catering. They are mainly used in scenarios such as takeout, fast food, and food packaging. They are made of various materials, with plastic food containers being the most common. They are lightweight, leak-proof, and inexpensive, but they are difficult to degrade and can easily cause environmental pollution.

[0003] Regarding the above technical conditions, there is a contradiction between the existing disposable lunch box lids in terms of preventing leakage and venting: traditional sealing structures are prone to leakage when inverted, while fully enclosed designs are prone to deformation of the lunch box due to internal steam pressure in high-temperature environments. Some products use a one-way venting valve structure, but it has problems such as complex structure, high cost, and poor liquid seepage prevention effect. When liquid comes into contact with the valve body, it is easy to leak.

[0004] Based on this, the present invention designs a disposable lunch box lid with an exhaust and leak-proof structure to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a disposable lunch box lid with an exhaust and leak-proof structure to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a disposable lunch box lid with an exhaust and leak-proof structure, comprising a lid body, the edge of which is provided with a snap-on edge, a card seat on the lid body, a card block inside the card seat, a positioning hole on the card seat, an exhaust pipe connected to the card block, a lateral channel connected to the exhaust pipe inside the card block, and a micro-gap channel between the card block and the card seat after installation.

[0007] By adopting the above technical solution, it is possible to effectively prevent the internal liquid from leaking out when the lunch box is inverted, thereby improving the usability of disposable lunch boxes.

[0008] Preferably, a locking ring is fixedly connected to the top outer side of the exhaust pipe.

[0009] By adopting the above technical solution, the installation and connection of the card block and the card holder can be convenient.

[0010] Preferably, the inner wall of the lateral channel is provided with a threaded guide groove, which can increase the effect of liquid reflux. The helix angle of the threaded guide groove is α = 15-30° and the groove depth is δ = 0.1-0.2 mm.

[0011] By adopting the above technical solution, the reflux rate of the liquid is improved.

[0012] Preferably, the top of the exhaust pipe is also provided with a hydrophobic filter membrane with a pore size of 5-10 μm.

[0013] By adopting the above technical solutions, the leak-proof effect of liquids can be further improved.

[0014] Preferably, the radius R of the lateral channel is ≤1.5mm, and the width of the micro-gap channel is 0.1-0.3mm.

[0015] By adopting the above technical solutions, a better leak-proof effect can be achieved.

[0016] In summary, this application has the following beneficial technical effects:

[0017] 1. By combining micro-gap channels with lateral channels, and with the synergistic effect of a 0.3mm gap and a 1.5mm channel radius, liquid leakage can be reduced to ≤0.1mL / min.

[0018] 2. The threaded guide grooves can significantly improve the liquid backflow speed. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0021] Figure 2 This is a schematic diagram of the rear structure of this embodiment;

[0022] Figure 3 This is a schematic diagram of the disassembled structure of the card block and card holder in this embodiment;

[0023] Figure 4 This is a schematic diagram of the card block structure in this embodiment.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Cover; 2. Fastening edge; 3. Card seat; 4. Card block; 5. Positioning hole; 6. Exhaust pipe; 7. Locking ring; 8. Side channel; 9. Threaded guide groove; 10. Hydrophobic filter membrane. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0028] A disposable lunch box lid with an exhaust and leak-proof structure includes a lid body 1, which can be square or round in shape, depending on the actual use. A snap-on edge 2 is provided on the edge of the lid body 1, which can securely fasten the lid body 1 to the disposable lunch box. A card seat 3 is provided on the lid body 1, and a card block 4 is provided inside the card seat 3. A positioning hole 5 is also provided on the card seat 3. The card block 4 is detachably snapped into the inside of the card seat 3. An exhaust pipe 6 is connected to the card block 4. A lateral channel 8 communicating with the exhaust pipe 6 is provided inside the card block 4. After installation, there is a micro-gap channel between the card block 4 and the card seat 3.

[0029] Furthermore, a locking ring 7 is fixedly connected to the top outer side of the exhaust pipe 6. During installation, the locking ring 7 passes through the positioning hole 5 and then snaps into the top of the positioning hole 5, thereby enabling the locking block 4 to be snapped into the locking seat 3.

[0030] Furthermore, a threaded guide groove 9 is provided on the inner wall of the lateral channel 8, which can increase the effect of liquid reflux. The helix angle α of the threaded guide groove 9 is 15-30° and the groove depth δ is 0.1-0.2mm.

[0031] Furthermore, a hydrophobic filter membrane 10, such as a PTFE membrane, with a pore size of 5-10 μm is also provided at the top of the exhaust pipe 6.

[0032] Furthermore, the radius R of the lateral channel 8 is ≤ 1.5 mm.

[0033] Furthermore, the width of the micro-gap channel is 0.1-0.3 mm.

[0034] The implementation principle of this embodiment is as follows: When the lunch box is inverted, the liquid enters the side channel 8 through the micro-gap channel. Under the condition that the channel radius R≤1.5mm, the liquid forms a meniscus due to surface tension. When the liquid column height h satisfies h>2σ / (ρgR) (σ is the liquid surface tension coefficient, ρ is the liquid density), the gas-liquid interface forms a sealing barrier. At this time, the bottom gas pressure P0 and the liquid column static pressure ρgh reach equilibrium. When the condition P0≥ρgh is satisfied, the liquid self-locking is achieved.

[0035] When in the upright position, steam is discharged through the top exhaust pipe 6. The ratio of the cross-sectional area S of the exhaust pipe 6 to the area of ​​the cover satisfies S / S0≥0.3% (S0 is the projected area of ​​the cover), ensuring that the internal pressure increment ΔP≤200Pa under 100℃ conditions, thus avoiding deformation of the lunch box.

[0036] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A disposable meal box cover with exhaust leakage prevention structure, comprising a cover body (1), characterized in that: The edge portion of the cover (1) is provided with a buckle (2), a clamping seat (3) is arranged on the cover (1), a clamping block (4) is arranged in the clamping seat (3), a positioning hole (5) is further formed on the clamping seat (3), an exhaust pipe (6) is communicated on the clamping block (4), a lateral channel (8) communicated with the exhaust pipe (6) is arranged in the clamping block (4), and a micro-gap channel exists between the clamping block (4) and the clamping seat (3) after installation.

2. The disposable lunch box cover with exhaust leak-proof structure according to claim 1, characterized in that: The top outer side of the exhaust pipe (6) is fixedly connected with a locking ring (7).

3. The disposable lunch box lid with exhaust leak-proof structure according to claim 1, characterized in that: The inner wall of the lateral channel (8) is provided with a threaded flow guide groove (9), which can increase the effect of liquid backflow, the spiral angle of the threaded flow guide groove (9) is alpha = 15-30°, and the groove depth is delta = 0.1-0.2mm.

4. The disposable lunch box lid with exhaust leak-proof structure according to claim 1, characterized in that: The top end of the exhaust pipe (6) is further provided with a hydrophobic filter membrane (10) with a pore size of 5-10um.

5. The disposable lunch box lid with exhaust leak-proof structure according to claim 1, characterized in that: The radius of the lateral channel (8) is R≤1.5mm, and the width of the micro-gap channel is 0.1-0.3mm.

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