Multifunctional exhaust valve for negative pressure preservation box

Abstract

This invention provides a multi-functional exhaust valve for negative pressure food storage containers. It features a sealing cap adapted to the container, with a pressure relief channel consisting of an upper cavity (larger at the top) and a lower cavity (smaller at the bottom). A constant pressure exhaust valve is installed within the pressure relief channel. A spring is positioned between the upper cavity and the constant pressure exhaust valve. The lower part of the constant pressure exhaust valve protrudes radially, forming an interference fit between the valve head and the wall of the lower cavity. The lower cavity wall radially widens, forming a conical pressure relief chamber. After the valve head enters the pressure relief chamber, a gap is created between it and the chamber wall. This invention cleverly utilizes a simple piston structure and the principle of air pressure to create a constant pressure exhaust valve. When the container is evacuated, the constant pressure exhaust valve descends to indicate the vacuum status. When excessive pressure is applied, the constant pressure exhaust valve excessively descends, creating an air passage for air intake, thus maintaining the container at a certain negative pressure value and ensuring stable use.

Description

Technical fields:

[0001] This utility model belongs to the field of vacuum preservation container technology, and in particular refers to a multi-functional exhaust valve for negative pressure preservation boxes. Background technology:

[0002] Vacuum-sealed containers are containers where food is placed inside, sealed with a lid, and the air inside is removed to create a negative pressure environment, allowing the food to stay fresh for longer. Currently, however, existing vacuum-sealed containers, whether vacuumed manually or electrically, are prone to over-vacuuming, which can easily deform, crack, or even explode, posing a safety hazard. Summary of the Invention:

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a multi-functional exhaust valve for negative pressure food storage containers, which has a vacuum negative pressure status indication and constant pressure protection function, so that the food storage container can be used stably and safely.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model is a multifunctional exhaust valve for a negative pressure food storage container. It has a sealing cap adapted to the container. The sealing cap is provided with a pressure relief channel, which is composed of an upper cavity (larger at the top and smaller at the bottom) and a lower cavity. A constant pressure exhaust valve is installed in the pressure relief channel. A spring is installed between the upper cavity and the constant pressure exhaust valve. The lower part of the constant pressure exhaust valve protrudes radially to form an interference fit between the valve head and the cavity wall of the lower cavity. The lower cavity wall of the lower part increases radially to form a conical pressure relief chamber. After the valve head enters the pressure relief chamber, a gap is created between it and the cavity wall of the pressure relief chamber.

[0006] The upper diameter of the lower cavity of this invention is radially reduced compared to the middle diameter, that is, the diameters of the upper, middle and lower parts of the lower cavity gradually increase in sequence, and the valve head moves in the pressure relief chambers in the middle and lower parts of the lower cavity.

[0007] The constant pressure exhaust valve of this utility model has an end cap at the top and a column in the middle that passes through the inner ring of the spring and is connected to the valve head. The end cap and the cavity wall of the upper cavity are in clearance fit.

[0008] In this invention, under normal conditions, the upper surface of the end cap is higher than the upper cavity.

[0009] The sealing cap of this utility model is also equipped with an air extraction valve.

[0010] The beneficial effects of this invention are as follows: After the sealing cap is fitted to the corresponding container, the air is evacuated from the container using the vacuum valve. When the vacuum reaches a negative pressure of 15-25 kPa, the constant pressure exhaust valve can be seen to sink downwards. That is, the constant pressure exhaust valve, initially higher than the surface of the sealing cap, gradually descends until it is flush with the surface of the sealing cap or even sinks in, allowing the user to know that the container is in a suitable vacuum state. Even if the electric vacuum equipment is used and excessive air is accidentally evacuated, the constant pressure exhaust valve will continue to sink and enter the pressure relief chamber, creating a gap with the chamber wall, thus forming an exhaust channel. This allows outside air to enter, maintaining the negative pressure value inside the container at 15-25 kPa, preventing the container from deforming, cracking, or even bursting. It requires no energy and is simple to operate, suitable for everyday food preservation containers, and has high economic value and market prospects. Attached image description:

[0011] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Appendix Figure 2 This is a cross-sectional view of the normal structure of this utility model;

[0013] Appendix Figure 3 This is a cross-sectional view of the optimal negative pressure state in this utility model;

[0014] Appendix Figure 4 This is a cross-sectional view of the depressurized state in this utility model. Detailed implementation method:

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] See Figures 1 to 4 As shown, this utility model is a multi-functional exhaust valve for a negative pressure food storage container. It has a sealing cap 1 adapted to the container, and the sealing cap 1 is provided with a pressure relief channel. A constant pressure exhaust valve 4 is installed in the pressure relief channel. The sealing cap 1 is also equipped with an air extraction valve 6. The air extraction valve 6 is a type of one-way valve commonly used in the prior art. After the sealing cap 1 is assembled on the corresponding container, a manual or electric air extraction device is connected to the air extraction valve 6 to extract the gas inside the container and create a vacuum negative pressure state inside. The negative pressure range in the container needs to be maintained by the constant pressure exhaust valve 4.

[0017] Specifically, the pressure relief channel runs through the sealing box 1 from top to bottom. The pressure relief channel consists of an upper cavity 2 (larger at the top) and a lower cavity 3 (smaller at the bottom). A spring 5 is installed between the upper cavity 2 and the constant pressure exhaust valve 4. The lower part of the constant pressure exhaust valve 4 protrudes radially to form a valve head 40 that is interference-fitted with the cavity wall of the lower cavity 3. The lower cavity wall of the lower cavity 3 radially increases to form a conical pressure relief chamber 31. After the valve head 40 enters the pressure relief chamber 31, a gap is created between it and the cavity wall of the pressure relief chamber 31. The upper part of the constant pressure exhaust valve 4 is an end cap 41, and the middle part is a column 42 that passes through the inner ring of the spring 5 and is connected to the valve head 40. The end cap 41 is clearance-fitted with the cavity wall of the upper cavity 2. Under normal conditions, the upper surface of the end cap 41 is higher than that of the upper cavity 2.

[0018] like Figure 2 As shown, under normal conditions, spring 5 supports end cap 41, and valve head 40 is interference-fitted with the cavity wall of lower cavity 3, preventing air from the upper part of upper cavity 2 of sealing box 1 from entering the container through lower cavity 3. When air is extracted from inside the container, a negative pressure is formed inside the container, causing constant pressure exhaust valve 4 to gradually compress spring 5 and sink. End cap 41 of constant pressure exhaust valve 4 sinks until its surface is flush with the surface of sealing cap 1 (e.g., Figure 3 As shown, this indicates the optimal negative pressure value inside the container. This optimal negative pressure value can be comprehensively adjusted by factors such as the distance from the lower chamber 3 to the pressure relief chamber 31, the size of the valve head 40, the thickness of the end cap 41, and the height of the spring. When the end cap 41 sinks from above the upper surface of the sealing cap 1 to be flush with it, it indicates to the user that the negative pressure value inside the container has reached the appropriate range.

[0019] If air continues to be pumped after the negative pressure value reaches a suitable range, the valve head 40 will sink into the pressure relief chamber 31, thus creating a gap between the valve head 40 and the wall of the pressure relief chamber 31 (e.g., Figure 4 As shown in the figure, since the end cap 41 and the column 42 in the constant pressure exhaust valve 4 are both clearance fit with the pressure relief channel, when the valve head 40 and the pressure relief channel are in a gap, the gas can easily enter the container from the outside, thereby completing the negative pressure correction in the container and keeping the negative pressure in the container at a negative pressure of 15-25 kPa.

[0020] In order to control the stability of the constant pressure exhaust valve 4 in the pressure relief channel and to prevent the constant pressure exhaust valve 4 from detaching from the pressure relief channel due to excessive positive pressure in the container, the structure of the lower cavity 3 is further restricted. The upper diameter of the lower cavity 3 is radially reduced compared to the middle diameter, that is, the diameter of the upper, middle and lower parts of the lower cavity 3 gradually increases in sequence. The valve head 40 moves in the pressure relief chamber 31 in the middle and lower parts of the lower cavity 3. In this way, when the valve head 41 reaches the upper end of the middle part of the lower cavity 3, it cannot continue to move upward.

[0021] It should be understood that the technical scope of this utility model is not limited to the contents of the specification. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A multifunctional exhaust valve for a negative pressure preservation box, having a sealing cover (1) adapted to a container, characterized in that: The sealing cover (1) is provided with a pressure relief channel, which is composed of an upper cavity (2) which is larger at the top and a lower cavity (3) which is smaller at the bottom. A constant pressure exhaust valve (4) is provided in the pressure relief channel. A spring (5) is provided between the upper cavity (2) and the constant pressure exhaust valve (4). The lower part of the constant pressure exhaust valve (4) protrudes radially to form a valve head (40) that is interference-fitted with the cavity wall of the lower cavity (3). The cavity wall of the lower part of the lower cavity (3) is radially enlarged to form a conical pressure relief cavity (31). After the valve head (40) enters the pressure relief cavity (31), a gap is generated between it and the cavity wall of the pressure relief cavity (31).

2. The multi-functional exhaust valve for a negative pressure preservation box according to claim 1, characterized in that: The upper diameter of the lower cavity (3) is radially reduced compared to the middle diameter, that is, the diameters of the upper, middle and lower parts of the lower cavity (3) gradually increase in sequence, and the valve head (40) moves in the pressure relief chamber (31) in the middle and lower parts of the lower cavity (3).

3. The multifunctional exhaust valve for a negative pressure preservation box according to claim 1 or 2, characterized in that: The upper part of the constant pressure exhaust valve (4) is an end cap (41), and the middle part is a column (42) that passes through the inner ring of the spring (5) and is connected to the valve head (40). The end cap (41) and the cavity wall of the upper cavity (2) are in clearance fit.

4. The multi-functional exhaust valve for a negative pressure preservation box according to claim 3, characterized in that: Under normal conditions, the upper surface of the end cap (41) is higher than the upper cavity (2).

5. The multi-functional exhaust valve for a negative pressure preservation box according to claim 1 or 2, characterized in that: The sealing cover (1) is also equipped with an air extraction valve (6).

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