Graduated pressure relief cover

Abstract

The present invention discloses a stepped pressure relief cover, which comprises a cover body screwed to the upper port of a container. A buffer cavity is formed by the side wall and the bottom of the upper cover and the cover body. A pressure relief assembly is arranged in the middle of the buffer cavity. The pressure relief assembly includes: a pressure relief valve, an exhaust key and a pressure relief spring. The pressure relief valve is made of an elastic material. The skirt at the lower port thereof covers the exhaust hole at the bottom of the cover. The upper end surface thereof is supported on the central column at the bottom of the cover and the support columns surrounding the central column. A circular sealing ring made of an elastic material is arranged between the outer circular edge at the upper part of the exhaust key and the edge of the air outlet hole. A through groove is arranged on the upper surface of the circular sealing ring. A pressure relief spring is arranged between the upper end surface and the exhaust key. The lower end of the rib around the exhaust key abuts against the upper end surface between the central column and the support columns. The stepped pressure relief cover of the present invention can not only ensure the sealing performance of the container and improve the heating efficiency of cups and pots, but also avoid the scalding risk caused by the gushing out of the mixture of steam and water, thus increasing the safety.

Description

Technical Field

[0001] The present invention relates to the lids of cups and pots, and particularly to a stepped pressure relief lid for cups and pots. Background Art

[0002] For cup and pot products on the market, especially those with heat preservation requirements such as thermos cups, vacuum flasks, electric kettles, and electric heating cups, they generally have a sealed structure; and some may also have an exhaust function, that is, when exhaust is needed, after pressing the corresponding button, the space inside the container is connected to the outside space, and the pressure inside the container is released. However, the current exhaust structures of these products are generally straight-through type, and the exhaust does not occur in stages. If the pressure inside the container is relatively high during exhaust, steam will gush out from the channel mixed with hot water, easily scalding the exposed parts such as the hands and faces of consumers. Summary of the Invention

[0003] The purpose of the present invention is to provide a stepped pressure relief lid, which can not only ensure the sealing performance of the container, improve the heating efficiency of cups and pots, but also avoid the scalding risk caused by the gushing out of the mixture of steam and water, increasing safety.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A stepped pressure relief lid includes a lid body screwed to the upper port of the container. An upper lid is provided at the upper port of the lid body. The upper lid, the side wall and the bottom of the lid body enclose a buffer cavity for pressure relief. A pressure relief assembly is provided in the middle of the buffer cavity. The pressure relief assembly includes: a pressure relief valve, an exhaust key and a pressure relief spring. The pressure relief valve is made of an elastic material. The skirt at the lower port thereof covers the exhaust hole at the bottom of the lid. Its upper end face is supported on the central column at the bottom of the lid and the support columns surrounding the central column. There is a circular ring-shaped seal made of an elastic material between the outer edge of the upper part of the exhaust key and the edge of the air outlet. There is a through groove on the upper surface of the circular ring-shaped seal, and a pressure relief spring is provided between the upper end face and the exhaust key. The lower end of the surrounding bone of the exhaust key abuts on the upper end face between the central column and the support columns.

[0006] Both the circular ring-shaped seal and the pressure relief valve are made of food-grade silicone rubber material.

[0007] A seal ring for sealing the upper port of the container is provided at the lower end of the lid body.

[0008] There are multiple exhaust holes, evenly distributed along the circumference.

[0009] Spring positioning columns for positioning the pressure relief spring are provided on the upper surface of the upper end face; exhaust key spring positioning columns for positioning the pressure relief spring are provided on the inner side of the upper end face of the exhaust key.

[0010] An assembly hole for accommodating the central column is provided on the upper surface of the upper end face.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: By adopting the above technical solution, the skirt of the pressure relief valve is elastic. When the pressure in the container is relatively large, the pressure can push open the skirt to block the exhaust hole. The steam pressure in the container is first discharged from the exhaust hole to the buffer cavity to reduce the pressure in the container. This is the first-stage pressure relief. Under the elastic force of the pressure relief spring, the through groove on the upper surface of the annular sealing ring is squeezed and in a closed state. The annular sealing ring can also play a sealing role, and the buffer cavity is not connected to the atmosphere. Even if there is water in the buffer cavity, there is no need to worry about water leakage problems. When gently pressing the exhaust button or in the initial stage of pressing the exhaust button, the annular sealing ring gets rid of the extrusion, and the through groove is in an open path state. The buffer space is connected to the atmosphere through the through groove and the air outlet. This is the second-stage pressure relief. The second-stage pressure relief is a slow pressure relief through the through groove, avoiding the risk of scalding caused by the excessive opening of the exhaust passage and the gushing out of steam and water mixed together, increasing safety. Furthermore, when pressing the exhaust button further down, the rib of the exhaust button presses down the upper end surface between the central column and the support column (i.e., presses down the shoulder of the upper end surface). Under the action of the central column and the support column, the upper end surface is concave, the skirt turns up, the exhaust hole is completely opened, and the annular sealing ring is completely separated from the upper cover, making the pressure relief passage completely opened. This is the third-stage pressure relief. The pressure in the container has been reduced, and the pressure in the buffer cavity has been emptied. Finally, the phenomenon of steam and water spraying out can be avoided. The three-stage buffer pressure relief enables steam and water not to gush out from the air outlet, avoiding the risk of scalding; it can not only ensure the sealing performance of the container, improve the heating efficiency of cups and kettles, but also avoid hot water leakage. Furthermore, it can ensure the portability of the structural product of the present invention.

[0012] A further beneficial effect is that the annular sealing ring and the pressure relief valve are both made of food-grade silicone rubber material, which can ensure the food safety of the water and food in contact with them; meet the elastic and sealing requirements of the pressure relief valve and the annular sealing ring; and can also make the service life of the pressure relief valve and the annular sealing ring longer.

[0013] The stepped pressure relief cover of the present invention has a wide range of applicability and can be applied to cup and kettle products such as thermos cups, thermos flasks, electric kettles, and electric cups. Description of the Drawings

[0014] Figure 1 is the structural schematic diagram of the present invention;

[0015] Figure 2 is Figure 1 the split structural schematic diagram of

[0016] Figure 3 is Figure 1 the structural schematic diagram of the pressure relief valve in

[0017] Figure 4 is Figure 1Structural schematic diagram of the pressure relief sealing ring;

[0018] Figure 5 It is a structural schematic diagram of the stepped pressure relief cover of the present invention installed on the upper port of the container;

[0019] Figure 6 It is a structural schematic diagram of the first-stage pressure relief state of the stepped pressure relief cover;

[0020] Figure 7 It is a structural schematic diagram of the second-stage pressure relief state of the stepped pressure relief cover;

[0021] Figure 8 It is a structural schematic diagram of the third-stage pressure relief state of the stepped pressure relief cover. Detailed implementation manners

[0022] In order to make the technical solution of the present invention clearer, the following combines the attached Figures 1 to 8 , and the present invention will be described in detail. It should be understood that the specific implementation manners described in this specification are only for explaining the present invention and not for limiting the protection scope of the present invention.

[0023] The present invention is a stepped pressure relief cover, including a cover body 6 screwed to the upper port of a container 9. An upper cover 1 is provided at the upper port of the cover body 6. The upper cover 1, the side wall and the bottom 6-4 of the cover body 6 enclose a buffer cavity 8 for pressure relief. A pressure relief assembly is provided in the middle of the buffer cavity 8. The pressure relief assembly includes: a pressure relief valve 5, an exhaust key 3 and a pressure relief spring 4; the pressure relief valve 5 is made of an elastic material, and the skirt 5-1 at its lower port covers the exhaust hole 6-3 of the bottom 6-4, and its upper end surface 5-4 is supported on the central column 6-2 of the bottom 6-4 and the support column 6-1 surrounding the central column 6-2; between the annular outer edge 3-1 at the upper part of the exhaust key 3 and the edge of the air outlet 1-1, there is a circular sealing ring 2 made of an elastic material. A plurality of through grooves 2-1 are provided on the upper surface of the circular sealing ring 2. Under the elastic force of the pressure relief spring 4, the through grooves 2-1 are squeezed and closed; a pressure relief spring 4 is provided between the upper end surface 5-4 and the exhaust key 3, and the lower end of the surrounding bone 3-2 of the exhaust key 3 abuts on the upper end surface 5-4 between the central column 6-2 and the support column 6-1.

[0024] Preferably, both the annular sealing ring and the pressure relief valve 5 are made of food-grade silicone rubber material. A sealing ring 7 for sealing the upper port of the container is provided at the lower end of the cover body 6. There are a plurality of exhaust holes 6-3, which are evenly distributed along the circumference. A spring positioning post 5-3 for positioning the pressure relief spring 4 is provided on the upper surface of the upper end surface 5-4; an exhaust key spring positioning post 3-3 for positioning the pressure relief spring 4 is provided on the inner side of the upper end surface of the exhaust key 3. An assembly hole 5-2 for accommodating the central column 6-2 is provided on the upper surface of the upper end surface 5-4. In order to improve the sealing effect, an annular groove 5-4-1 can be provided at the contact portion between the upper end surface 5-4 and the lower end of the surrounding bone 3-2.

[0025] The container 9 described in each of the above solutions refers to cup and kettle products, especially products with heat preservation and / or heating requirements such as thermos cups, thermos flasks, electric kettles, and electric cups.

Claims

1. A stepped pressure relief cover, comprising a cover body (6) screwed to the upper port of a container, characterized in that, an upper cover (1) is provided at the upper port of the cover body (6), and a buffer cavity (8) for pressure relief is formed between the side wall and the bottom (6-4) of the cover body (6) and the upper cover (1). A pressure relief assembly is provided in the middle of the buffer cavity (8), and the pressure relief assembly includes: a pressure relief valve (5), an exhaust key (3) and a pressure relief spring (4). The pressure relief valve (5) is made of an elastic material, and the skirt (5-1) at its lower port covers the exhaust hole (6-3) of the bottom (6-4). Its upper end face (5-4) is supported on the central column (6-2) of the bottom (6-4) and the support column (6-1) surrounding the central column (6-2). There is a circular sealing ring (2) made of an elastic material between the outer edge (3-1) of the upper part of the exhaust key (3) and the edge of the air outlet hole (1-1). A through groove (2-1) is provided on the upper surface of the circular sealing ring (2), and a pressure relief spring (4) is provided between the upper end face (5-4) and the exhaust key (3). The lower end of the surrounding bone (3-2) abuts on the upper end face (5-4) between the central column (6-2) and the support column (6-1); the skirt (5-1) of the pressure relief valve (5) is elastic. When the pressure in the container is relatively high, the pressure can push open the skirt (5-1) to block the exhaust hole (6-3). When the exhaust key (3) is gently pressed or in the initial stage of pressing the exhaust key (3), the circular sealing ring (2) gets rid of extrusion. Continuing to press the exhaust key (3) downwards makes the surrounding bone (3-2) press down on the upper end face (5-4) between the central column (6-2) and the support column (6-1). Under the action of the central column (6-2) and the support column (6-1), the upper end face (5-4) sinks, the skirt (5-1) turns up, the exhaust hole (6-3) is completely opened, and the circular sealing ring (2) is completely separated from the upper cover (1), so that the pressure relief passage is completely opened.

2. The stepped pressure relief cover according to claim 1, characterized in that: both the circular sealing ring and the pressure relief valve (5) are made of food-grade silicone rubber material.

3. The stepped pressure relief cover according to claim 2, characterized in that: a sealing ring (7) for sealing the upper port of the container is provided at the lower end of the cover body (6).

4. The stepped pressure relief cover according to claim 3, characterized in that: there are a plurality of exhaust holes (6-3), which are evenly distributed along the circumference.

5. The stepped pressure relief cover according to claim 4, characterized in that: a spring positioning column (5-3) for positioning the pressure relief spring (4) is provided on the upper surface of the upper end face (5-4); an exhaust key spring positioning column (3-3) for positioning the pressure relief spring (4) is provided on the inner side of the upper end face of the exhaust key (3).

6. The stepped pressure relief cover according to claim 5, characterized in that: an assembly hole (5-2) for accommodating the central column (6-2) is provided on the upper surface of the upper end face (5-4).

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