Negative pressure identification structure, vacuum valve and sealing cover

Abstract

This invention discloses a negative pressure marking structure, a vacuum valve, and a sealing cap. The negative pressure marking structure includes: a substrate with a first surface; a deformable diaphragm disposed on the substrate, capable of elastic deformation; and a follower block connected to the deformable diaphragm, having a second and a third surface of different colors. The first and second surfaces together form a first color tone; or, the first, second, and third surfaces together form the first color tone. When the substrate facing the deformable diaphragm is under normal pressure, both the deformable diaphragm and the follower block are in their reset positions, displaying the first color tone; the first and third surfaces together form the second color tone. When the substrate facing the deformable diaphragm is under negative pressure, the deformable diaphragm moves the follower block, causing the second surface to be concealed within the substrate, thus displaying the second color tone. The color change visually indicates the negative pressure status of the container, allowing users to quickly determine it visually without manual lifting or complex operations, effectively improving ease of use and reliability of vacuum status monitoring.

Description

Technical Field

[0001] This invention relates to the field of vacuum sealing technology, and in particular to a negative pressure marking structure, a vacuum valve having a negative pressure marking structure, and a sealing cap. Background Technology

[0002] In the storage and transportation of food, pharmaceuticals, and precision instruments, vacuum sealing technology is often used to create a negative pressure environment by removing gas from the container during storage and transportation to extend shelf life and prevent oxidation or moisture absorption. Traditional vacuum containers such as vacuum packaging bags and vacuum food storage boxes typically use an external vacuum pump or a built-in air extraction device to remove internal air, making the internal pressure lower than the external atmospheric pressure, thus achieving airtight preservation. For example, a vacuum food storage box is an everyday product that extends the shelf life of food by creating and maintaining a negative pressure environment inside the box to inhibit microbial growth and slow down food oxidation and spoilage. It is widely used in households, catering, and the food storage industry.

[0003] However, in actual use, users often find it difficult to visually determine whether the container is still under effective negative pressure. In some applications, users typically judge indirectly by manually lifting the lid. If the lid is difficult to lift due to atmospheric pressure, it indicates that the container may still be under negative pressure; conversely, if the lid can be easily lifted, it may be leaking or the required negative pressure standard may not have been met.

[0004] However, this process is cumbersome, requiring users to repeatedly try lifting the lid, which can be especially difficult when the container is tightly sealed, impacting the user experience. Secondly, the judgment relies on subjective feelings; different users have varying sensitivities to the lid's tightness, and factors such as container material and aging of the sealing ring can lead to misjudgments of lifting resistance. More importantly, this method is destructive, requiring external force to disrupt the seal. It cannot monitor the internal negative pressure in real time without opening the container or disrupting the vacuum environment, preventing users from promptly detecting leaks and compromising the safety of stored items. Summary of the Invention

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a negative pressure indicator structure that intuitively displays the negative pressure status of a container through color changes. Users can quickly determine this visually without the need for manual lifting or complex operations. The structure is simple, reliable, and low-cost, effectively improving ease of use and the reliability of vacuum status monitoring, and is widely applicable to everyday scenarios such as vacuum food storage containers.

[0006] The present invention also proposes a vacuum valve having the above-mentioned negative pressure marking structure and a sealing cap.

[0007] The negative pressure marking structure according to the present invention includes: The substrate has a first surface; A deformable diaphragm is disposed on the substrate, and the deformable diaphragm is capable of elastic deformation; A follower block is connected to the deformable diaphragm, and the follower block is provided with a second side and a third side of different colors; Wherein, the first surface and the second surface together form a first hue; or, the first surface, the second surface and the third surface together form a first hue; when the side of the substrate facing the deformable diaphragm is under normal pressure, the deformable diaphragm and the follower block are both in the reset position and display the first hue; The first surface and the third surface together form a second hue; when the substrate is under negative pressure on the side facing the deformable diaphragm, the deformable diaphragm moves the follower block and causes the second surface to be hidden in the substrate, thereby displaying the second hue.

[0008] The negative pressure marking structure according to the present invention has at least the following beneficial effects: Through a unique mechanical linkage design and color combination mechanism, it achieves intuitive, reliable, and low-cost visual judgment of the negative pressure state inside a container or cavity. Compared with the indirect methods of judging vacuum state by manually lifting the lid in the prior art, this structure associates the elastic deformation of the deformable diaphragm with the movement of the follower block, and uses the color difference between the first surface of the substrate and the second and third surfaces of the follower block to construct a visual signal system. For example, when the side of the substrate facing the deformable diaphragm is under normal pressure, the deformable diaphragm maintains its natural reset shape, and the follower block is also in its initial position. At this time, the first surface of the substrate and the second surface of the follower block, or together with the third surface, present a preset first hue. If different colors are presented, the user can directly observe the specific color combination. When the side of the substrate facing the deformable diaphragm enters a negative pressure state, the external atmospheric pressure acts on the deformable diaphragm, causing it to deform in a specific direction. The deformation force of the deformable diaphragm is transmitted to the follower block, causing it to move and hide the originally exposed second surface within the substrate. This reveals a third surface that matches the color of the first surface of the substrate, ultimately presenting a second hue distinct from the first, or even the same color. This process requires no electronic components or complex sensors; it relies solely on the elastic deformation and linkage of the mechanical structure. This fundamentally simplifies structural design, reduces manufacturing costs and failure risks, and utilizes the intuitiveness of color changes. Users can quickly and accurately identify whether the current state is under effective negative pressure simply through everyday visual observation, without needing to learn professional judgment methods or rely on subjective feelings. This completely solves the problems of cumbersome operation, ambiguous results, and potential seal damage associated with traditional lid-lifting judgment methods. It can be stably integrated into the sealing systems of vacuum food containers, vacuum valves, and other devices, adapting to diverse application scenarios and significantly improving the convenience and trust users have in managing vacuum conditions.

[0009] According to some embodiments of the present invention, the negative pressure marking structure has a first side and a second side with different colors, and a first side and a third side with the same color.

[0010] According to some embodiments of the negative pressure marking structure of the present invention, a mounting hole is provided in the middle of the base, and the follower block can move up and down in the mounting hole.

[0011] According to some embodiments of the negative pressure marking structure of the present invention, the inner diameter of the mounting hole is larger than the outer diameter of the follower block.

[0012] According to some embodiments of the negative pressure marking structure of the present invention, the deformable diaphragm is disposed on the lower side of the mounting hole, and the periphery of the deformable diaphragm is integrally connected to the peripheral wall of the mounting hole.

[0013] According to some embodiments of the negative pressure marking structure of the present invention, the peripheral surface of the follower block is the second surface, the entire outer surface of the top of the follower block is the third surface, and the upper surface of the substrate is the first surface.

[0014] According to some embodiments of the present invention, in the negative pressure marking structure, a fixing block is fixedly disposed on the side of the deformable diaphragm facing the follower block, and a fixing hole is disposed on the side of the follower block away from the third surface. The fixing block is inserted into the fixing hole and is interference-fitted with the fixing hole.

[0015] According to some embodiments of the present invention, the deformable diaphragm is arc-shaped. When the substrate is under negative pressure on the side facing the deformable diaphragm, the deformable diaphragm can be concave and deformed on the side away from the follower block.

[0016] The vacuum valve according to the present invention includes the negative pressure marking structure of the present invention; the base can be floated and installed on the cavity wall of the cavity, and there is a gas extraction channel between the base and the cavity; when the vacuum pump is running, the base moves toward one side of the vacuum pump to open the gas extraction channel and extract gas from the cavity outward.

[0017] The vacuum valve according to the present invention has at least the following beneficial effects: through the floating installation of the base and the linkage design of the evacuation channel, the vacuum extraction function and negative pressure status monitoring are integrated; when the vacuum pump is running, the base moves towards the vacuum pump side under the action of the gas pressure difference, which not only opens the evacuation channel to discharge the gas in the cavity, but also triggers the deformation of the deformable diaphragm after evacuation, thereby intuitively displaying the current negative pressure status through a significant color change. There is no need to add an additional independent monitoring component. Users can directly judge whether the cavity has successfully formed and maintained negative pressure by observing the color, avoiding the problem of traditional vacuum valves relying on pressure gauges or complex sensors, improving the convenience and reliability of vacuum operation, and is especially suitable for industrial or household scenarios that require quick confirmation of the evacuation effect.

[0018] The sealing cap according to the present invention includes the negative pressure marking structure of the present invention; a cap body for sealing with a container, the cap body being provided with an air extraction hole; a base body being provided with an upper pressure ring portion and a lower pressure ring portion, the upper pressure ring portion and the lower pressure ring portion being respectively disposed on both sides of the cap body, the base body being floatingly mounted on the air extraction hole through the upper pressure ring portion and the lower pressure ring portion, and an air extraction channel being provided between the base body and the cap body; when the vacuum pump is running, the base body moves toward one side of the vacuum pump to open the air extraction channel and extract gas from the container outward.

[0019] The sealing cap according to the present invention has at least the following beneficial effects: through the floating installation of the base and the cap and the coordinated design of the evacuation channel, the functions of container sealing and negative pressure monitoring are integrated. After the cap and the container are closed, the base is floatingly installed on the evacuation hole through the upper and lower pressure rings. When the vacuum pump is used, the base moves towards the vacuum pump side to open the evacuation channel and discharge the gas in the container. At the same time, the deformable diaphragm drives the follower block to move according to the internal pressure state of the container. The color change intuitively indicates whether the effective negative pressure is maintained. This design seamlessly combines the conventional evacuation function and the status monitoring function of the sealing cap. Users do not need to disassemble the container or perform manual lifting operations. They only need to observe the color of the marking on the cap to quickly determine the internal vacuum state. This solves the problem of traditional sealing caps relying on destructive inspection and significantly improves the user experience and safety of daily necessities such as vacuum food containers.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic cross-sectional view of the negative pressure indicator structure in a negative pressure detection state according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of the negative pressure indicator structure in the state of detecting negative pressure, according to an embodiment of the present invention. Figure 3 This is an exploded structural diagram of the negative pressure marking structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the negative pressure marking structure applied to the sealing cap and the container being under negative pressure, according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the overall structure of the negative pressure marking structure in the reset state according to an embodiment of the present invention; Figure 6 This is a schematic cross-sectional view of the negative pressure marking structure in the reset state according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the negative pressure marking structure applied to the sealing cap in an embodiment of the present invention when the container is under normal pressure.

[0022] Explanation of icon numbers: 100; 101; 102; 103; 110; 120; Deformable diaphragm 200; Follower block 300; second surface 301; third surface 302; fixing hole 310; Fixed block 400; Cover 500; Air extraction port 510; Container 600. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0025] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0027] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] In the storage and transportation of food, pharmaceuticals, and precision instruments, vacuum sealing technology is often used to create a negative pressure environment by removing gas from the container during storage and transportation to extend shelf life and prevent oxidation or moisture absorption. Traditional vacuum containers such as vacuum packaging bags and vacuum food storage boxes typically use an external vacuum pump or a built-in air extraction device to remove internal air, making the internal pressure lower than the external atmospheric pressure, thus achieving airtight preservation. For example, a vacuum food storage box is an everyday product that extends the shelf life of food by creating and maintaining a negative pressure environment inside the box to inhibit microbial growth and slow down food oxidation and spoilage. It is widely used in households, catering, and the food storage industry.

[0029] However, in actual use, users often find it difficult to visually determine whether the container is still under effective negative pressure. In some applications, users typically judge indirectly by manually lifting the lid. If the lid is difficult to lift due to atmospheric pressure, it indicates that the container may still be under negative pressure; conversely, if the lid can be easily lifted, it may be leaking or the required negative pressure standard may not have been met.

[0030] However, this process is cumbersome, requiring users to repeatedly try lifting the lid, which can be especially difficult when the container is tightly sealed, impacting the user experience. Secondly, the judgment relies on subjective feelings; different users have varying sensitivities to the lid's tightness, and factors such as container material and aging of the sealing ring can lead to misjudgments of lifting resistance. More importantly, this method is destructive, requiring external force to disrupt the seal. It cannot monitor the internal negative pressure in real time without opening the container or disrupting the vacuum environment, preventing users from promptly detecting leaks and compromising the safety of stored items.

[0031] Therefore, such as Figures 1 to 7As shown, the negative pressure marking structure proposed in this invention includes a substrate 100, a deformable diaphragm 200 disposed on the substrate 100, and a follower block 300 connected to the deformable diaphragm 200. The substrate 100 has a first surface 101, and the follower block 300 has a second surface 301 and a third surface 302 of different colors. Correspondingly, the first surface 101 and the second surface 301 form a first color tone; or, the first surface 101, the second surface 301, and the third surface 302 together form the first color tone. The first surface 101 and the third surface 302 form the second color tone. Furthermore, the deformable diaphragm 200 can undergo elastic deformation. In application, when the side of the substrate 100 facing the deformable diaphragm 200 is under normal pressure, both the deformable diaphragm 200 and the follower block 300 are in the reset position and display the first hue. When the side of the substrate 100 facing the deformable diaphragm 200 is under negative pressure, the deformable diaphragm 200 drives the follower block 300 to move and causes the second surface 301 to be hidden inside the substrate 100 to display the second hue.It should be noted that, through a unique mechanical linkage design and color combination mechanism, a direct, reliable, and low-cost visual judgment of the negative pressure state inside the container 600 or cavity is achieved. Compared with the indirect methods of judging the vacuum state, such as manually lifting the lid 500, in existing technologies, this structure associates the elastic deformation of the deformable diaphragm 200 with the movement of the follower block 300, and uses the color differences between the first surface 101 of the substrate 100 and the second surface 301 and third surface 302 of the follower block 300 to construct a visual signal system. For example, when the side of the substrate 100 facing the deformable diaphragm 200 is under normal pressure, the deformable diaphragm 200 maintains its natural reset shape, and the follower block 300 is also in its initial position. At this time, the first surface 101 of the substrate 100 and the second surface 301 or the third surface 302 of the follower block 300 together present a preset first hue. If different colors are presented, the user can directly observe the specific color combination. When the side of the substrate 100 facing the deformable diaphragm 200 enters a negative pressure state, the external atmospheric pressure acts on the deformable diaphragm 200. The deformation of the diaphragm 200 causes it to deform in a specific direction. The deformation force of the diaphragm 200 is transmitted to the follower block 300, which moves the follower block 300. This causes the originally exposed second surface 301 to be hidden inside the substrate 100, while the third surface 302, which matches the color of the first surface 101 of the substrate 100, is exposed. Ultimately, a second hue is presented that is different from the first hue, but the effect of the same color is achieved. This process does not require any electronic components or complex sensors. It can be completed solely by the elastic deformation and linkage of the mechanical structure. This not only fundamentally simplifies the structural design and reduces manufacturing costs and failure risks, but also utilizes the intuitiveness of color change. Users do not need to learn professional judgment methods or rely on subjective feelings. They can quickly and accurately identify whether the current state is an effective negative pressure state simply by observing the color change. This completely solves the problems of the traditional lifting lid 500 judgment method, which is cumbersome, has ambiguous results, and may damage the seal. It can be stably integrated into the sealing system of vacuum food storage boxes, vacuum valves, and other equipment, adapting to diverse application scenarios and significantly improving the convenience and trust of users in vacuum status management.

[0032] It is understood that the specific forms of the first and second hues can be varied, as long as they are visually distinct. For example, the first hue may be a monochromatic or monochromatic combination, while the second hue may be a mixed color combination; or, for another example, the first hue may be a mixed color combination, while the second hue may be a monochromatic or monochromatic combination; or, the first hue may be one type of mixed color combination, while the second hue may be another type of mixed color combination. To further enhance the color contrast and recognizability during negative pressure state switching, in some embodiments of the present invention, the colors of the first surface 101 and the second surface 301 are different, while the colors of the first surface 101 and the third surface 302 are the same. Optionally, both the first surface 101 and the third surface 302 may be red, and the second surface 301 may be yellow. In response, when the container 600 is under normal pressure, the first surface 101 of the substrate 100 and the second surface 301 of the follower block 300 (or further combined with the third surface 302) form a distinct first hue combination due to their color difference, which the user can intuitively identify as the normal state. However, when negative pressure triggers the deformation diaphragm 200 to move, the follower block 300 moves, causing the second surface 301 to hide and the third surface 302 to be exposed. At this time, the first surface 101 and the third surface 302 of the substrate 100 form a unified visual effect due to their identical color, which is significantly different from the first hue. Furthermore, this targeted color design avoids misjudgment caused by chaotic color combinations, ensuring that users can quickly distinguish the negative pressure state simply by color changes, such as from "dissimilar" to "same" or vice versa, significantly improving the accuracy and efficiency of visual judgment while simplifying the user's cognitive burden of color signals.

[0033] Refer to Figures 1 to 3 , Figure 5 and Figure 6 In some embodiments of the present invention, a mounting hole 110 is provided in the middle of the substrate 100, and the follower block 300 can move up and down in the mounting hole 110. By providing a mounting hole 110 in the middle of the substrate 100 and providing a lifting space for the follower block 300, the mounting hole 110 serves as a track for the vertical movement of the follower block 300, restricting the follower block 300 to only move along the axial direction. This avoids motion jamming or abnormal color display caused by tilting, offsetting, or rotating the follower block 300, thereby ensuring that the deformation force of the deformable diaphragm 200 can be efficiently and stably transmitted to the follower block 300, making its movement path controllable. This ensures that the switching process of the second surface 301 is smooth and accurate. That is, when under normal pressure, the follower block 300 is in the high position of the mounting hole 110 and the second surface 301 is exposed; when under negative pressure, the follower block 300 moves down to the low position and hides the second surface 301. Furthermore, the presence of mounting holes 110 reduces the need for additional components, and functional integration is achieved through the structural design of the base 100 itself, further reducing the complexity of the overall structure and manufacturing costs.

[0034] In other embodiments, the inner diameter of the mounting hole is equal to the outer diameter of the follower block (not shown in the figure), which can accurately limit the lifting and lowering of the follower block. However, because the deformation driving force of the deformable diaphragm cannot occur completely regularly, the follower block may become stuck against the inner wall of the mounting hole, resulting in incomplete lifting and lowering. To address this, as... Figure 1 and Figure 6As shown, in some embodiments of the present invention, the inner diameter of the mounting hole 110 is larger than the outer diameter of the follower block 300. Furthermore, while ensuring the lifting function of the follower block 300, a necessary clearance is provided. This clearance allows the follower block 300 to move flexibly under the deformation force of the deformable diaphragm 200, avoiding excessive frictional resistance due to interference fit, which would hinder the action response. Simultaneously, the appropriate clearance can compensate for manufacturing tolerances of dimensional deviations in the mounting hole 110 or the follower block 300, and allows the follower block 300 to slide freely under different working conditions such as material expansion caused by temperature changes, thereby maintaining the long-term reliability of the color switching function, especially suitable for vacuum containers 600 scenarios requiring frequent use or long-term storage. Furthermore, the deformable diaphragm 200 is disposed on the lower side of the mounting hole 110 and integrally connected to the peripheral wall of the mounting hole 110, achieving a stable integration of the deformable diaphragm 200 and the substrate 100. For example, both the substrate 100 and the deformable diaphragm 200 are made of silicone. The deformable diaphragm 200 is integrally connected to the substrate 100 through injection molding or hot pressing, ensuring no gaps or loosening between them and avoiding structural failure due to diaphragm detachment or displacement. Simultaneously, the deformable diaphragm 200 is positioned below the mounting hole 110, allowing it to directly withstand the pressure from the substrate 100 on the side facing the deformable diaphragm 200. To fully utilize the elastic properties of the material for efficient negative pressure response, in some embodiments of the present invention, the deformable diaphragm 200 has an arc-shaped structure. On one hand, the arc-shaped geometry has higher deformation sensitivity than a planar diaphragm, capable of generating significant deformation under small pressure differences, thereby improving the detection capability of weak negative pressure states. On the other hand, the arc-shaped structure has stable mechanical properties and is not prone to fatigue deformation over long-term use, ensuring the long-lasting effectiveness of the color indication function, especially suitable for vacuum sealing scenarios requiring high-precision monitoring. When the side of the substrate 100 facing the deformable diaphragm 200 is under normal pressure, the deformable diaphragm 200 maintains its natural arc shape, supporting the follower block 300 at a high position. When the side of the substrate 100 facing the deformable diaphragm 200 is under negative pressure, the deformable diaphragm 200 can deform inwards towards the side away from the follower block 300. The rigid support of the periphery of the mounting hole 110 on the deformable diaphragm 200, through the deformation of the middle of the deformable diaphragm 200, concentrates the deformation force and transmits it to the follower block 300, driving it to move precisely downwards. This layout optimizes the force transmission path and improves the sensitivity of the pressure response. Meanwhile, the assembly operation of the follower block 300 is simplified, and the stability of the overall structure is enhanced. For example, in some embodiments of the present invention, a fixing block 400 is fixedly provided on the side of the deformable diaphragm 200 facing the follower block 300, such as the deformable diaphragm 200 and the fixing block 400 being integrally formed. Correspondingly, a fixing hole 310 is provided on the side of the follower block 300 away from the third surface 302. The fixing block 400 is inserted into the fixing hole 310 and is interference-fitted with the fixing hole 310. Optionally, the fixing block 400 and the fixing hole 310 are both circular, square or polygonal.It is understandable that the interference fit between the fixing block 400 and the fixing hole 310 connects the deformable diaphragm 200 and the follower block 300, achieving reliable fixation and force transmission between them. The interference fit ensures that the fixing block 400 is tightly embedded in the fixing hole 310, preventing slippage or separation during the deformation of the diaphragm 200 and thus preventing operational failure. Furthermore, this connection method eliminates the need for additional fasteners or adhesives, simplifying the assembly process and reducing production costs. When external air pressure changes, the deformation force of the diaphragm 200 is directly transmitted to the follower block 300 through the fixing block 400, ensuring accurate response and movement of the follower block 300 and avoiding color display delays or errors due to loose connections. In other embodiments, both the fixing block 400 and the follower block 300 are made of silicone and are integrally connected via injection molding or hot pressing. To further standardize the logical relationships of color display, refer to... Figure 3 In some embodiments of the present invention, the peripheral surface of the follower block 300 is the second surface 301, the entire outer surface of the top of the follower block 300 is the third surface 302, and the upper surface of the substrate 100 is the first surface 101. Therefore, when the follower block 300 is in the reset position, i.e., when the side of the substrate 100 facing the deformable diaphragm 200 is under normal pressure, the peripheral surface of the follower block 300, i.e., the second surface 301, is exposed to the outside and combines with the first surface 101 of the substrate 100 to form a first hue; when the side of the substrate 100 facing the deformable diaphragm 200 is under negative pressure and triggers the follower block 300 to move downward, the second surface 301 of the follower block 300 is hidden within the mounting hole 110 of the substrate 100, and the top of the follower block 300, i.e., the third surface 302, is exposed and combines with the first surface 101 of the substrate 100 to form a second hue. This targeted surface allocation design ensures the intuitiveness of color changes. Users only need to observe the color change of the outermost visible surface of the follower block 300 to directly determine the negative pressure state, without having to distinguish complex structures. This conforms to users' normal visual habits and further improves the convenience and accuracy of judgment.

[0035] Refer to Figure 2 and 5 According to an embodiment of the present invention, a vacuum valve includes a reference Figure 1 and Figure 6The negative pressure marking structure of this invention includes a base 100 that can be floatingly mounted on the cavity wall, with an air extraction channel 120 between the base 100 and the cavity. During vacuum pump operation, the base 100 moves towards the side of the vacuum pump to open the air extraction channel 120 and extract gas from the cavity. It is understood that the cavity is a space capable of creating negative pressure, such as a closed food storage container, a closed stirring container, or a closed storage bag. Correspondingly, the base 100 can be mounted on the container body or lid 500 of the food storage container, the container body or lid of the stirring container, or the bag body of the storage bag. It should be noted that the air extraction channel 120 formed between the mounted base 100 and the cavity can be referenced from the one-way air extraction channel 120 structure of a conventional vacuum valve, which will not be elaborated upon here.

[0036] According to an embodiment of the present invention, the vacuum valve, by adopting the negative pressure marking structure of the present invention, and through the floating installation of the base 100 and the linkage design of the evacuation channel 120, integrates the vacuum extraction function and the negative pressure status monitoring. When the vacuum pump is running, the base 100 moves towards the vacuum pump side under the action of the gas pressure difference, which not only opens the evacuation channel 120 to discharge the gas in the cavity, but also triggers the deformation of the deformable diaphragm 200 after evacuation, thereby intuitively displaying the current negative pressure status through a significant color change. There is no need to add an additional independent monitoring component. Users can directly judge whether the cavity has successfully formed and maintained a negative pressure by observing the color, avoiding the problem of traditional vacuum valves relying on pressure gauges or complex sensors, improving the convenience and reliability of vacuum operation, and is especially suitable for industrial or household scenarios that require quick confirmation of the evacuation effect.

[0037] Other configurations and operations of the vacuum valve according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0038] Refer to Figure 4 and Figure 7 According to an embodiment of the present invention, the sealing cap includes a reference Figures 1 to 3 , Figure 5 and Figure 6The negative pressure marking structure of this embodiment of the invention also includes a cover 500 for sealing with the container 600. The cover 500 has a suction port 510, and the base 100 has an upper pressure ring 102 and a lower pressure ring 103, which are respectively located on both sides of the cover 500. The base 100 is floatingly mounted to the suction port 510 via the upper pressure ring 102 and the lower pressure ring 103, forming a suction channel 120 between the base 100 and the cover 500. During vacuum pump operation, the base 100 moves towards the side of the vacuum pump to open the suction channel 120 and extract gas from the container 600. Similarly, the installed base 100 and cover 500 form a suction channel 120, which can be referenced to the one-way suction channel 120 structure of a conventional vacuum valve on the cover 500, and will not be described in detail here.

[0039] According to an embodiment of the present invention, the sealing cap, by adopting the negative pressure marking structure of the present invention, and through the floating installation of the base 100 and the cap 500 and the coordinated design of the evacuation channel 120, integrates the functions of sealing the container 600 and monitoring negative pressure. After the cap 500 and the container 600 are closed, the base 100 is floatingly installed on the evacuation hole 510 through the upper pressure ring 102 and the lower pressure ring 103. When the vacuum pump is pumping, the base 100 moves towards the vacuum pump side to open the evacuation channel 120 to discharge the gas inside the container 600. At the same time, the deformable diaphragm 200 drives the follower block 300 to move according to the internal pressure state of the container 600. The color change intuitively indicates whether the effective negative pressure is maintained. This design seamlessly combines the conventional evacuation function and the status monitoring function of the sealing cap. Users do not need to disassemble the container 600 or perform manual lifting operations. They only need to observe the marking color on the cap 500 to quickly determine the internal vacuum state. This solves the problem of traditional sealing caps relying on destructive inspection and significantly improves the user experience and safety of daily necessities such as vacuum food containers.

[0040] Other configurations and operations of the sealing cap according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A negative pressure marking structure, characterized in that, include: A substrate having a first surface and mounting holes; A deformable diaphragm is disposed on the substrate and below the mounting hole. The deformable diaphragm is capable of elastic deformation, and the periphery of the deformable diaphragm is integrally connected to the peripheral wall of the mounting hole. A follower block is connected to the deformable diaphragm and can move up and down in the mounting hole. The follower block is provided with a second side and a third side of different colors. Wherein, the first surface and the second surface together form a first hue; or, the first surface, the second surface, and the third surface together form a first hue. When the substrate is under normal pressure on the side facing the deformable diaphragm, both the deformable diaphragm and the follower block are in the reset position and display the first hue. The first surface and the third surface together form a second hue; when the substrate is under negative pressure on the side facing the deformable diaphragm, the deformable diaphragm moves the follower block and causes the second surface to be hidden in the substrate, thereby displaying the second hue.

2. The negative pressure marking structure according to claim 1, characterized in that: The first side and the second side are different colors, and the first side and the third side are the same color.

3. The negative pressure marking structure according to claim 1, characterized in that: The mounting hole is located in the middle of the base.

4. The negative pressure marking structure according to claim 3, characterized in that: The inner diameter of the mounting hole is larger than the outer diameter of the follower block.

5. The negative pressure marking structure according to claim 3, characterized in that: The peripheral surface of the follower block is the second surface, the entire outer surface of the top of the follower block is the third surface, and the upper surface of the substrate is the first surface.

6. The negative pressure marking structure according to claim 1, characterized in that: A fixing block is fixedly provided on the side of the deformable diaphragm facing the follower block, and a fixing hole is provided on the side of the follower block away from the third surface. The fixing block is inserted into the fixing hole and is interference-fitted with the fixing hole.

7. The negative pressure marking structure according to claim 1, characterized in that: The deformable diaphragm has an arc-shaped structure. When the substrate is under negative pressure on the side facing the deformable diaphragm, the deformable diaphragm can deform inwards towards the side away from the follower block.

8. A vacuum valve, characterized in that: Includes the negative pressure marking structure as described in any one of claims 1 to 7; the substrate is floatably mounted on the cavity wall of the cavity, and there is an air extraction channel between the substrate and the cavity; when the vacuum pump is running, the substrate moves toward one side of the vacuum pump to open the air extraction channel and extract gas from the cavity outward.

9. A sealing cap, characterized in that: Includes the negative pressure marking structure as described in any one of claims 1 to 7; A lid for sealing with a container, the lid being provided with an evacuation hole; The base body is provided with an upper pressure ring and a lower pressure ring, which are respectively disposed on both sides of the cover. The base body is floatingly mounted on the evacuation port through the upper and lower pressure rings. An evacuation channel is provided between the base body and the cover. When the vacuum pump is running, the base body moves toward one side of the vacuum pump to open the evacuation channel and extract gas from the container.

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