Negative-pressure constant-pressure valve for preservation box
By designing a T-shaped valve body and spring structure for the negative pressure constant pressure valve, the problem of the lid being difficult to open due to negative pressure after hot food in the food storage container cools down is solved. This achieves a balance between automatic pressure relief and preservation effect under appropriate negative pressure, ensuring the convenience and durability of the food storage container.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-06
- Publication Date
- 2026-04-03
AI Technical Summary
Existing food storage containers generate negative pressure after hot food cools down, making the lid difficult to open, and the existing pressure relief structure is difficult to use while maintaining the preservation effect.
Design a negative pressure constant pressure valve, including a T-shaped valve body and a spring structure. Through the cooperation of the limiting part and the pressing part of the valve body, the air pressure in the food storage box is automatically adjusted to ensure that the pressure is automatically released when the negative pressure is too high, so as to facilitate opening the lid and maintain the preservation effect under the appropriate negative pressure.
It automatically releases pressure when the negative pressure inside the food storage container becomes too high, making it easy to open the lid. At the same time, it maintains the freshness of the food and the durability of the lid under appropriate negative pressure, avoiding damage to the lid caused by excessive negative pressure.
Smart Images
Figure CN224079662U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of constant pressure technology for food storage containers, specifically relating to a negative pressure constant pressure valve for food storage containers. Background Technology
[0002] Food storage containers are becoming increasingly common in people's lives, especially among working professionals who often carry them to store their lunches. However, when hot food is placed in a food storage container and the lid is closed, the air inside the container will compress due to thermal expansion and contraction as the food cools, creating negative pressure. Once negative pressure is created, it becomes very difficult to manually open the lid. Lids with pressure relief structures are not uncommon. Correspondingly, the negative pressure inside the food storage container can effectively prevent outside air from entering, resulting in better preservation. However, there needs to be a limit to the negative pressure, and it also needs to be convenient for people to use. Currently available pressure relief structures actually fail to meet these requirements. Utility Model Content
[0003] To solve the above-mentioned technical problems, this utility model provides a negative pressure constant pressure valve for food storage containers. The valve body is T-shaped and its upper pressing part is abutted against the air inlet chamber by a spring. The lower end of the valve body is sealed on the through hole by a limiting part. When a negative pressure is generated in the container and exceeds the supporting force provided by the spring, the valve body sinks and air enters through the through hole until the pressure in the container is balanced. Then the limiting part is resealed to maintain a seal. The pressure can also be manually released by manual means, which is convenient to use.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A negative pressure constant pressure valve for a food storage container includes a cover, a valve body, and a spring. The cover has a valve cavity that extends vertically through the container. A horizontally placed annular plate is provided inside the valve cavity. The annular plate has a through hole extending vertically through the container. The valve body is a rotating structure with a T-shaped cross-section. The valve body fits into the through hole. The upper end of the valve body is an outwardly extending pressing part. The pressing part abuts against the upper surface of the annular plate through a spring sleeved on the valve body. The lower end of the valve body has an outwardly protruding limiting part. The limiting part can abut against the lower surface of the annular plate.
[0006] The annular plate divides the valve chamber into an air intake chamber and a pressure relief chamber. The pressing part and the spring are located in the air intake chamber, and the limiting part is located in the pressure relief chamber. When the limiting part abuts against the annular plate, the upper end face of the pressing part is flush with the upper end face of the cover. The cross-section of the limiting part is a triangular structure extending outward, and the upper inclined surface of the limiting part is connected to the edge of the through hole.
[0007] This type of negative pressure constant pressure valve for food storage containers uses a valve chamber on the lid for gas entry and exit. To achieve a gas sealing effect, a horizontally placed annular plate is used inside the valve chamber, dividing it into an air inlet chamber and a pressure relief chamber. A through hole is located in the middle of the annular plate, and a T-shaped rotating valve body fits into this hole. In the air inlet chamber, the upper pressing part of the valve body is spring-loaded against the upper end of the annular plate. Therefore, when the pressing part is pushed down, the valve body is propelled into the pressure relief chamber, allowing air to enter through the through hole from the air inlet chamber. If the lower end of the valve body does not have a limiting mechanism... If the valve body cannot maintain constant pressure, a limiting part is provided at the lower end of the valve body. When the limiting part abuts against the edge of the through hole, the upper end face of the pressing part is flush with the upper end face of the cover, ensuring that there is no protruding valve body on the upper end face of the cover. This prevents the limiting part from losing its sealing function when it abuts against the valve body under the action of external force. The limiting part has a triangular structure. After the upper inclined surface of the limiting part completely abuts against the edge of the through hole, when the pressure inside the box at the lower end of the cover increases suddenly due to external force pulling upward, the upper inclined surface of the limiting part can remain abutting against the edge of the through hole and maintain the sealing function.
[0008] As the hot food inside the container gradually cools, a negative pressure is generated inside the container. At this time, since the lid is completely sealed by fastening it to the container, the only way for gas to enter or exit is through the valve chamber. However, because the valve body is pushed upward by the spring, the limiting part at the lower end of the valve body keeps the through hole sealed. As long as the negative pressure does not exceed the upward resisting force of the limiting part held by the spring, the negative pressure will be maintained inside the container. When it is necessary to open the food storage container, press down on the pressing part, causing the limiting part to move downward. Therefore, air will enter from the air inlet chamber into the pressure relief chamber, relieving the negative pressure inside the container and making it easier to open the lid.
[0009] To keep food fresh inside the food storage container, a vacuum can be created inside the container after closing the lid, generating negative pressure. Since completely removing all air is unnecessary and artificially increasing external pressure on the lid will only accelerate its damage, a suitable negative pressure is necessary to maintain food freshness and the lid's durability. Therefore, the container should automatically release pressure once the vacuum reaches a suitable level. When the negative pressure inside the container exceeds the spring's resistance, the limiting part will be pulled down, causing the pressing part to also press down, resulting in spring compression. Air will then enter the container through the gap between the limiting part and the through-hole, filling the container with air and maintaining the negative pressure until the pressure inside the container reaches equilibrium. Once this is achieved, the limiting part will then reseal the through-hole, thus achieving a constant negative pressure. The negative pressure can be adjusted by replacing the spring to suit different usage scenarios.
[0010] The valve body has a vertically penetrating display cavity along its axis, and a display diaphragm is horizontally placed inside the display cavity. The display diaphragm has an upwardly convex arc structure, and the upper end face of the display diaphragm is flush with the upper end face of the pressing part. The ratio of the diameter of the valve body to the diameter of the display cavity is not less than 5:3.
[0011] Furthermore, the limiting part is composed of a transition part and a closing part from top to bottom. The transition part fits into the through hole, and the upper end face of the closing part is in contact with the lower end face of the annular plate. The transition part is interference-fitted with the through hole. The outer side wall of the upper end of the transition part is provided with axially distributed exhaust grooves.
[0012] Compared with the prior art, the advantages of this utility model are as follows: the sealing force of the limiting part to the through hole is maintained by the abutting force of the pressing part being pushed up by the spring. Therefore, when the lid is closed on the box, hot food can be placed inside. After the food cools down naturally, the negative pressure generated can be used to press the pressing part to allow air to enter the box, thus facilitating the opening of the lid. In addition, when the box is vacuumed to keep the food fresh, the limiting part can be pulled down and the spring can be compressed when the negative pressure exceeds the limit. This allows air to enter the box from the gap between the limiting part and the through hole, changing the negative pressure inside the box, thus achieving the effect of constant negative pressure. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.
[0014] Figure 1 This is a perspective view of the present utility model;
[0015] Figure 2 This is an exploded view of the present invention;
[0016] Figure 3 This is a top view of Embodiment 1 of the present invention;
[0017] Figure 4 For the present utility model Figure 3 AA section view;
[0018] Figure 5 For the present utility model Figure 4 A magnified view of section B;
[0019] Figure 6 This is a top view of Embodiment 2 of the present invention;
[0020] Figure 7 For the present utility model Figure 6 CC section view;
[0021] Figure 8 For the present utility model Figure 7 A magnified view of a portion of point D.
[0022] The components are: 1. Cover; 11. Valve cavity; 12. Annular plate; 13. Through hole; 14. Air inlet cavity; 15. Pressure relief cavity; 2. Valve body; 21. Pressing part; 22. Limiting part; 221. Transition part; 222. Closing part; 223. Exhaust groove; 23. Display cavity; 24. Display diaphragm; 3. Spring. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0024] The specific embodiments of this utility model will now be described with reference to the accompanying drawings:
[0025] Example 1:
[0026] like Figure 1-5 As shown, a negative pressure constant pressure valve for a food storage container includes a cover 1, a valve body 2, and a spring 3. The cover 1 has a valve cavity 11 that extends vertically through the container. The valve cavity 11 has a horizontally placed annular plate 12. The annular plate 12 has a through hole 13 extending vertically through the container. The valve body 2 is a rotating structure with a T-shaped cross-section. The valve body 2 fits into the through hole 13. The upper end of the valve body 2 has an outwardly extending pressing part 21. The pressing part 21 abuts against the upper end face of the annular plate 12 through the spring 3 sleeved on the valve body 2. The lower end of the valve body 2 has an outwardly protruding limiting part 22. The limiting part 22 can abut against and connect to the lower end face of the annular plate 12.
[0027] The annular plate 12 divides the valve chamber 11 into an air intake chamber 14 and a pressure relief chamber 15. The pressing part 21 and the spring 3 are located in the air intake chamber 14, and the limiting part 22 is located in the pressure relief chamber 15. When the limiting part 22 abuts against the annular plate 12, the upper end face of the pressing part 21 is flush with the upper end face of the cover 1. The cross-section of the limiting part 22 is an outwardly extending triangular structure, and the upper inclined surface of the limiting part 22 is in contact with the edge of the through hole 13.
[0028] The valve body 2 has a vertically penetrating display cavity 23 along its axis, and a display diaphragm 24 is horizontally placed inside the display cavity 23. The display diaphragm 24 has an upwardly convex arc structure, and the upper end face of the display diaphragm 24 is flush with the upper end face of the pressing part 21. The ratio of the diameter of the valve body 2 to the diameter of the display cavity 23 is not less than 5:3.
[0029] Description of the working principle of this utility model:
[0030] The negative pressure constant pressure valve for food storage containers using this structure has a valve chamber 11 on the lid 1 for gas entry and exit. To achieve a gas sealing effect, an annular plate 12 is horizontally placed inside the valve chamber 11. The annular plate 12 divides the valve chamber 11 into an air inlet chamber 14 and a pressure relief chamber 15. A through hole 13 is provided in the middle of the annular plate 12. The valve body 2, which has a T-shaped rotating structure, fits into the through hole 13. In the air inlet chamber 14, the pressing part 21 at the upper end of the valve body 2 abuts against the upper end of the annular plate 12 by a spring 3. Therefore, when the pressing part 21 is pushed down, the valve body 2 will be pushed into the pressure relief chamber 15. Thus, air can enter the pressure relief chamber 15 through the through hole 13 along the air inlet chamber 14. If the valve body... If there is no limit at the lower end, the valve body 2 cannot achieve constant pressure. Therefore, a limit part 22 is provided at the lower end of the valve body 2. When the limit part 22 abuts against the edge of the through hole 13, the upper end face of the pressing part 21 is flush with the upper end face of the cover 1, ensuring that there is no protruding valve body 2 on the upper end face of the cover 1. This prevents the limit part 22 from losing its sealing function when it abuts against the valve body 2 under the action of external force. The limit part 22, which is triangular in structure, has its upper inclined surface completely abutting against the edge of the through hole 13. When the pressure inside the box at the lower end of the cover 1 increases suddenly due to external force pulling the valve body 2 upward, the inclined surface at the upper end of the limit part 22 can remain abutting against the edge of the through hole 13 and maintain the sealing function.
[0031] As the hot food inside the container gradually cools down, a negative pressure is generated inside the container. At this time, since the perimeter of the lid 1 is completely sealed with the container, the only way for gas to enter and exit is through the valve chamber 11. However, under the action of the spring 3, the valve body 2 pushes the pressing part 21 upward, so that the limiting part 22 at the lower end of the valve body 2 keeps the through hole 13 sealed. As long as the negative pressure does not exceed the upward resisting force of the limiting part 22 held by the spring 3, the negative pressure will be maintained inside the container. When it is necessary to open the food storage container, press down on the pressing part 21, so that the limiting part 22 is pushed down. Therefore, air will enter the pressure relief chamber 15 from the air inlet chamber 14, releasing the negative pressure inside the container and making it easier to open the lid 1.
[0032] To keep the food inside the food storage container fresh, a vacuum can be created inside the container after the lid 1 is closed, generating negative pressure. Since it is unnecessary to completely vacuum out all air, adding external pressure to the lid 1 will only accelerate its damage. Therefore, under a suitable negative pressure state, the food can remain fresh and the lid 1 can be kept durable. Thus, it is necessary to automatically release pressure when the vacuum reaches a suitable state. When the negative pressure inside the container exceeds the resistance force provided by the spring 3, the limiting part 22 will be pulled down, causing the pressing part 21 to also be pressed down, resulting in the compression deformation of the spring 3. Air will enter the container through the gap between the limiting part 22 and the through hole 13, filling the container with air and maintaining the negative pressure state inside the container. After the pressure inside the container is balanced, the limiting part 22 will seal the through hole 13 again to achieve a seal, thus achieving the function of constant negative pressure. When different usage conditions are required, the negative pressure can be changed by replacing the spring 3.
[0033] A vertically penetrating display cavity 23 is provided along the axis of the valve body 2. The display diaphragm 24 inside is an upwardly convex arc structure, and the upper end face of the arc structure is flush with the upper end face of the pressing part 21. Therefore, when a negative pressure is generated inside the box, the display diaphragm 24 will be concave downward under the action of the negative pressure. Thus, when viewed from the outside of the cover 1, it can be determined whether a negative pressure state is maintained inside the box by whether the display diaphragm 24 is concave. In addition, the ratio of the diameter of the valve body 2 to the diameter of the display cavity 23 is not less than 5:3. When it is lower than this value, the side wall between the valve body 2 and the display cavity 23 will greatly weaken its pressure-bearing capacity, making the valve body 2 easily damaged when facing negative pressure.
[0034] Example 2:
[0035] like Figure 6-8 The limiting part 22 is composed of a transition part 221 and a closing part 222 from top to bottom. The transition part 221 fits into the through hole 13, and the upper end face of the closing part 222 is in contact with the lower end face of the annular plate 12. The transition part 221 is interference-fitted with the through hole 13. The outer side wall of the upper end of the transition part 221 is provided with axially distributed exhaust grooves 223.
[0036] Because the elastic force of the spring 3 assembled during the production process has deviations, the constant pressure in the box body will be inconsistent. To solve this problem, the limiting part 22 is set as a transition part 221 and a closing part 222, which are two parts. The transition part 221 fits into the through hole 13, and the closing part 222 has a flat upper end face, so that it can fit more closely to the lower end face of the annular plate 12. In order to match the sealing position and improve the sealing effect, the transition part 221 is interference-fitted with the through hole 13, so that the transition part 221 can have a better sealing effect than the upward sealing in Embodiment 1, generating negative pressure in the box body and requiring To maintain constant pressure during venting, an axially distributed venting groove 223 is provided on the outer wall of the upper end of the transition section 221. When the valve body 2 gradually sinks and causes the venting groove 223 to communicate with the inside of the box, air enters from the venting groove 223 and changes the negative pressure state inside the box. After the upward resisting force of the limiting part 22 held by the spring 3 exceeds the negative pressure, the valve body 2, which rises again, will close the venting groove 223, thereby maintaining the constant pressure state inside the box. The venting groove 223 can be set into two symmetrical sets to make the venting effect better. When it is necessary to open the box, press the pressing part 21 to allow air to enter the box and release the negative pressure, thus completing the opening of the lid.
[0037] The beneficial effects of this utility model are as follows: the sealing force of the limiting part 22 on the through hole 13 is maintained by the abutting force of the pressing part 21 being pushed up by the spring 3. Therefore, when the lid 1 is closed on the box, hot food can be placed in it. After the food cools down naturally, the negative pressure generated can be used to press the pressing part 21 to allow air to enter the box, thus facilitating the opening of the lid 1. In addition, when the box is vacuumed to keep the food fresh, the limiting part 22 can be pulled down and the spring 3 can be compressed when the negative pressure exceeds the limit. This allows air to enter the box from the gap between the limiting part 22 and the through hole 13, changing the negative pressure in the box and thus achieving the effect of constant negative pressure.
[0038] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A negative constant pressure valve for a crisper drawer, characterized by: The utility model provides a valve structure, including cover, valve body and spring, be equipped with up and down through valve cavity on the cover, be equipped with the annular plate of transverse in the valve cavity, be equipped with up and down through the through -hole of annular plate middle, the valve body is the rotating body structure of section T letter type, the valve body is fitted in the through -hole, the valve body upper end is the compression part that extends outward, the compression part is through the spring of setting on the valve body and annular plate upper end face and abuts, the valve body lower end is equipped with the limiting portion that projects outward, the limiting portion can abut and connect in annular plate lower end face.
2. The negative constant pressure valve for a crisper according to claim 1, wherein: The annular plate divides the valve cavity into the air inlet cavity and the pressure relief cavity, the compression part and the spring are located in the air inlet cavity, the limiting portion is located in the pressure relief cavity, when the limiting portion abuts on the annular plate, the upper end surface of the compression part is flush with the upper end surface of the cover.
3. The negative constant pressure valve for a crisper according to claim 2, wherein: The limiting portion is triangular in cross section, the upper end of the limiting portion is inclined to the edge of the through-hole.
4. The negative constant pressure valve for a crisper according to claim 2, wherein: The limiting portion is composed of an upper transition portion and a closed portion, the transition portion is fitted in the through-hole, and the upper end surface of the closed portion is abuttable with the lower end surface of the annular plate.
5. The negative constant pressure valve for a crisper according to claim 4, wherein: The transition portion is in interference fit with the through-hole.
6. The negative constant pressure valve for a crisper according to claim 5, wherein: An exhaust groove is arranged on the outer wall of the upper end of the transition portion.
7. The negative constant pressure valve for a crisper according to claim 3 or 6, characterized in that: An exhibition cavity is arranged on the axis of the valve body, and an exhibition diaphragm is arranged in the exhibition cavity.
8. The negative constant pressure valve for a crisper drawer of claim 7, wherein: The exhibition diaphragm is arc-shaped and protrudes upward, and the upper end surface of the exhibition diaphragm is flush with the upper end surface of the compression part.
9. The negative constant pressure valve for a crisper drawer of claim 8, wherein: The diameter of the valve body is not less than 5:3 of the diameter of the exhibition cavity.