Pure physical negative pressure water control device with controllable liquid level

Abstract

The invention discloses a pure physical negative pressure water control device with a controllable liquid level and an accessory and a water drinking appliance applying the device, and belongs to the technical field of negative pressure water delivery and liquid level control. The device core comprises a water delivery main body with a water delivery inner cavity and a water cut-off mechanism, the water cut-off mechanism can enable the water delivery inner cavity not to form negative pressure sufficient for continuous water delivery when the liquid level drops to the preset warning liquid level. A pure physical structure is completely adopted, no electronic element or sensor is arranged, and based on the atmospheric pressure principle and buoyancy trigger control, the core functions that when the liquid level is higher than the warning liquid level, normal airtight water delivery is achieved, when the liquid level is lower than the warning liquid level, water delivery is automatically stopped, and after the liquid level rises, automatic reset is achieved are achieved. Low-temperature water at the bottom of the container is forcibly reserved, the water layering principle is utilized, the function that boiled water can be instantly drunk without waiting for cooling after being added into the container is achieved, and the industrial pain point that the boiled water cannot be instantly drunk is thoroughly solved. The device is extremely simple in structure, accurate in starting and stopping, extremely high in reliability and extremely high in adaptability, and can be widely applied to various scenes such as civil drinking water, small fluid conveying and liquid level control.

Description

Technical Field

[0001] This invention relates to the field of negative pressure water supply and liquid level control technology, and in particular to a liquid level controllable negative pressure water control device with a purely physical structure, as well as water control accessories and drinking appliances using the device. Background Technology

[0002] In everyday drinking water scenarios, people often encounter situations where they can only obtain boiling water at 100℃. The boiling water is too hot to drink directly and requires a long time to cool down naturally, making drinking water extremely inconvenient. This problem is even more pronounced in outdoor, office, and travel scenarios where there is no dedicated cooling equipment.

[0003] Existing solutions for hot drinking water have significant drawbacks: First, using heat-insulating materials for straws only slows down the temperature rise of the straw itself, but cannot prevent boiling water from being directly inhaled into the mouth, still posing a high risk of burns. Second, electronically controlled drinking water systems with water temperature control require electronic components such as temperature sensors, electronic valves, and power supply modules, which are not only complex in structure and costly to produce, requiring regular maintenance, but also suffer from reliability issues such as leaks, short circuits, and power supply failures, making them completely unsuitable for everyday portable civilian drinking water scenarios. Third, using cold water as a substitute requires that cold water be readily available, which is very inconvenient.

[0004] There is a common misconception among those skilled in the art: to drink water from the bottom of the cup, the straw must be inserted to the bottom. Therefore, when it is necessary to stop drinking at a certain liquid level, people's first reaction is to cut the straw to that level. However, the fatal flaw of this method is that it can never drink water below that level, and thus cannot achieve the function of "reserving cold water at the bottom of the cup".

[0005] In addition, existing liquid level control structures for negative pressure water supply also have many shortcomings: most structures cannot achieve the core requirement that "the inlet is always at the bottom of the container and the stop liquid level is at a preset height above the bottom"; some structures can achieve liquid level shutdown, but cannot achieve automatic reset after water replenishment, requiring manual operation and adjustment, resulting in a very poor user experience; and some structures have high requirements for the installation environment and cannot be adapted to common drinking containers such as regular water cups and water bottles, resulting in serious lack of versatility.

[0006] Meanwhile, existing buoyancy-based liquid level control structures are mostly used for container inlet valve control (such as toilet tank float valves). Their core function is to control the start and stop of water inlet into the container, rather than for negative pressure breakage control in negative pressure water delivery scenarios. The working principles, application scenarios, and structural designs of the two are fundamentally different and cannot be directly applied to solve the core pain points of the aforementioned drinking water scenarios.

[0007] Therefore, developing a negative pressure water control device with a purely physical structure, no electronic components, precise liquid level control, automatic reset capability, strong adaptability, and the ability to perfectly solve the problem of boiling water not being drinkable immediately has become an urgent issue for the industry. Summary of the Invention

[0008] To overcome the shortcomings of the prior art, the core objective of this invention is to provide a purely physical negative pressure water control device with controllable liquid level. This device requires no sensors, electronic components, or power supply modules, and achieves the core functions of "bottom water intake, stopping water delivery at a preset warning level, and automatic reset when the liquid level rises" precisely through a purely mechanical physical structure. By forcibly reserving a preset height of water at the bottom of the container and utilizing the principle of water stratification, this invention enables the immediate consumption of boiling water without waiting for it to cool down, completely solving the industry pain point that boiling water cannot be consumed immediately.

[0009] Another objective of this invention is to provide negative pressure water control accessories and drinking appliances that utilize this water control device, covering all product forms across various scenarios, and further expanding the scope of protection and application boundaries.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A purely physical negative pressure water control device with controllable liquid level includes a water conveying body (1) and a water shut-off mechanism; The water conveying body (1) has a water conveying inner cavity (2) that runs from end to end. One end of the cavity is a bottom immersion end (3) for immersing into the liquid to be conveyed, and the other end is a top negative pressure end (4) for connecting to a negative pressure source. The water cut-off mechanism can switch the water delivery cavity (2) to a state where the liquid level in the environment where the bottom immersion end (3) is located drops to a preset warning level (13) when the liquid level drops to a preset warning level (13). This state prevents the top negative pressure end (4) from forming a negative pressure sufficient to continuously deliver liquid from the bottom immersion end (3) to the top negative pressure end (4).

[0011] Furthermore, the water-cutting mechanism prevents the water-transporting cavity (2) from forming an effective negative pressure by blocking the liquid flow channel of the water-transporting cavity (2) or by connecting the water-transporting cavity (2) to the outside atmosphere.

[0012] Furthermore, the water cut-off mechanism includes an air intake switch mechanism; the air intake switch mechanism includes an air intake hole (5), a buoyancy sealing component (6), and a limiting part (7); The air inlet (5) connects the water delivery cavity (2) with the outside atmosphere, and its opening position corresponds to the preset warning liquid level (13); The density of the buoyancy sealing component (6) is less than that of the liquid to be transported, and it can move with the change of liquid level. The limiting part (7) is used to limit the movement of the buoyancy sealing member (6), so that the buoyancy sealing member (6) can only switch between the blocking state of blocking the air inlet (5) and the opening state of avoiding the air inlet (5).

[0013] Furthermore, the air inlet (5) is opened on the wall of the water conveying body (1); the buoyancy sealing member (6) is a C-shaped, U-shaped, annular, spherical or sheet-like structure, and is sleeved on or adjacent to the water conveying body (1).

[0014] Furthermore, the limiting part (7) includes a limiting sleeve coaxially sleeved around the outer periphery of the water conveying body (1), and an annular chamber for the buoyancy sealing member (6) to move is formed between the limiting sleeve and the water conveying body (1); the two ends of the limiting sleeve are provided with limiting stops, and the limiting stops are provided with a conductive structure for free flow of liquid; the limiting part (7) may also be a protrusion structure, a baffle structure or a limiting frame structure.

[0015] Furthermore, the inner side of the buoyancy sealing member (6) is provided with a sealing protrusion (6a), the position of which corresponds to the position of the air inlet (5). When the buoyancy sealing member (6) is in a blocking state, the sealing protrusion (6a) is embedded in or fits the air inlet (5) to block the air inlet (5).

[0016] Furthermore, the number of air inlets (5) is at least one, and the ratio of the total ventilation area of ​​all air inlets (5) to the cross-sectional area of ​​the water conveying cavity (2) is 0.1 to 0.3.

[0017] This numerical range is derived from the basic principles of fluid mechanics: the viscosity of air is approximately 1 / 800 that of water, and under the same pressure difference, the flow velocity of air is much greater than that of water. When the ratio of the total ventilation area of ​​the air inlet to the cross-sectional area of ​​the water conveying cavity reaches 0.1, the negative pressure generated by suction through the human mouth will preferentially draw air in through the air inlet, failing to create a negative pressure sufficient to continuously transport water to the top; when this ratio is greater than 0.3, even if the air inlet is mostly blocked, excessive air leakage will occur, affecting normal water delivery.

[0018] Based on the maximum negative pressure that the human oral cavity can generate (approximately 40 kPa), this invention limits the ratio to 0.1~0.3, preferably 0.15. At this value, both reliable water shut-off function and smooth water delivery during normal operation can be guaranteed.

[0019] Furthermore, the negative pressure source is the human oral cavity.

[0020] This invention also discloses a negative pressure water control accessory, comprising a purely physical negative pressure water control device with controllable liquid level as described in any of the above claims; the bottom immersion end (3) and / or the top negative pressure end (4) of the water supply body (1) are provided with a connection structure for connecting to an external pipeline. The connection structure can adopt any detachable or fixed connection form such as threaded connection, plug connection, or snap-fit ​​connection, and can be adapted to external water supply pipelines of different specifications, realizing modular assembly and adaptation.

[0021] This invention also discloses a drinking device comprising a purely physical negative pressure water control device with controllable liquid level as described in any of the above claims. The drinking device includes, but is not limited to, water cups with straws, thermos cups, kettles, portable water dispensers, etc., and the water control device can be integrated into the straw and water outlet channel of the drinking device to achieve a scalding-proof drinking function with controllable liquid level.

[0022] The core principle of this invention is the atmospheric pressure negative pressure breaking principle + buoyancy trigger control, combined with the water stratification principle to achieve the function of instant boiling water drinking. The specific working logic is as follows: The core essence of negative pressure water conveyance is to draw air out at the top outlet to create negative pressure in the water conveyance cavity of the main body. At this time, the external atmospheric pressure is much greater than the pressure inside the pipe, which can force the water in the container into the water conveyance cavity from the bottom inlet and finally send it out from the top outlet to complete the water conveyance process.

[0023] Because hot water is less dense than room temperature water, when boiling water is added to a container, the boiling water floats on top of the room temperature water. Without vigorous shaking of the container, heat exchange between the upper and lower layers of water occurs primarily through conduction, with very little convection. Therefore, the room temperature water at the bottom can maintain a suitable inlet temperature for a considerable period.

[0024] This device automatically stops drawing water at a preset warning level, forcibly reserving low-temperature water at the bottom of the container. Each time the user inhales, they only draw in the low-temperature water from the bottom of the container; even if the upper layer contains boiling water at 100°C, it will not be inhaled into the mouth, thus enabling immediate drinking of boiling water.

[0025] Normal water supply status (external liquid level ≥ warning level) When the liquid level in the container is higher than the preset warning level, the water shut-off mechanism is in the conductive state, and the water delivery cavity of the main water delivery body forms a completely sealed chamber, no different from an ordinary sealed water delivery pipe. At this time, water is drawn in / air is drawn out through the top outlet, and a stable negative pressure can be formed inside the pipe. The external atmospheric pressure continuously forces the water at the bottom of the container into the water delivery cavity from the bottom inlet, achieving normal water delivery.

[0026] Automatic water supply stop status (external liquid level < warning level) When the liquid level in the container continues to drop below the warning level, the water cut-off mechanism switches to the cut-off state, preventing the water delivery cavity from forming a negative pressure sufficient to continuously transport liquid from the bottom inlet to the top outlet. Even if the bottom inlet is still submerged in water below the warning level, water cannot be forced into the water delivery cavity, making continuous water delivery impossible and accurately achieving the function of "automatically stopping water delivery when the warning level is reached".

[0027] Automatic reset status (external liquid level ≥ warning level after water replenishment) When water is replenished into the container and the liquid level rises above the warning level, the water shut-off mechanism automatically switches back to the conducting state, the water conveying body's inner cavity returns to a sealed state, and it automatically returns to a state where it can convey water normally. It can be reused without any manual operation.

[0028] Compared with the prior art, the present invention has the following significant advantages: 1. Achieve instant drinking of boiling water without waiting for it to cool down: This device uses the principle of water stratification to force the low-temperature water at the bottom of the container to be reserved, so that even if the user adds 100℃ boiling water to the container, they can immediately drink water at the appropriate temperature at the bottom of the cup, which completely solves the industry pain point that boiling water needs to be cooled down before it can be drunk. 2. Transforming subjective self-control into objective physical limitations: Users do not need to consciously control their water intake; the device automatically stops drawing water at the warning level, ensuring that water at the appropriate temperature is always available after each addition of boiling water. Even in cases of extreme thirst, users will not accidentally drink the boiling water on top, greatly improving drinking water safety. 3. Purely physical structure, extremely reliable: This device has no electronic components, sensors, or power supply modules. It relies entirely on the principles of buoyancy and atmospheric pressure to achieve its functions. There is no risk of failure such as short circuits, power outages, or component damage. It has an extremely long service life, maximum reliability, and extremely low production costs, making it suitable for mass production and widespread civilian use. 4. Extremely broad scope of protection and great difficulty in circumvention: Through a superior structural design, the core independent claims of this invention retain only the necessary technical features to achieve the function, without limiting the application scenario, structural form, material, or specific size parameters. It covers all negative pressure water control devices based on this core principle. No matter what scenario it is applied to, such as drinking water, industrial transportation, experimental equipment, aquarium equipment, etc., no matter how the structural form, parameters, or optimization details are adjusted, it will fall within the protection scope of this invention. 5. Precise liquid level control and extremely high adaptability: The water delivery stop position can be set arbitrarily by adjusting the height of the warning liquid level, with extremely high control precision; the core structure can be adapted to containers of any size and water delivery body of any specification. Whether it is an integrated pipette or modular water control accessories, they can all be adapted, making them extremely versatile. 6. Automatic reset, easy to use: No manual operation is required. The water supply function will be automatically restored after the liquid level rises. The start and stop response is sensitive and the operation threshold is zero, making it suitable for daily high-frequency use scenarios. 7. Hygiene and Safety: The reserved water is constantly replenished with new water each time it is added, preventing long-term stagnation and eliminating hygiene issues. Regular cleaning of the container ensures safe drinking water. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the invention and form part of this invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the liquid level controllable pure physical negative pressure water control device in the shut-off state according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the liquid level controllable pure physical negative pressure water control device described in Embodiment 1 of the present invention in the conductive state; Figure 3 This is a three-dimensional structural diagram of the liquid level controllable pure physical negative pressure water control device described in Embodiment 2 of the present invention in the cut-off state; Figure 4 This is a schematic cross-sectional view of the liquid level controllable pure physical negative pressure water control device described in Embodiment 2 of the present invention in the shut-off state. Figure 5 This is a three-dimensional structural diagram of the liquid level controllable pure physical negative pressure water control device described in Embodiment 2 of the present invention in the conductive state. Figure 6 This is a cross-sectional structural diagram of the liquid level controllable pure physical negative pressure water control device described in Embodiment 2 of the present invention in the conductive state; Figure 7. Working logic flowchart of the liquid level controllable negative pressure water control device of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0031] Example 1 This embodiment is a preferred implementation of the present invention, which achieves the water cut-off function by communicating the water conveying cavity with the outside atmosphere. Figure 1 and Figure 2As shown, it includes a water conveying body (1) and an air intake switch mechanism.

[0032] Among them, the water conveying body (1) is a food-grade rigid tubular structure with a water conveying cavity (2) that runs through the end. Its lower end is provided with a bottom immersion end (3) that communicates with the water conveying cavity (2), and its upper end is provided with a top negative pressure end (4) that communicates with the water conveying cavity (2).

[0033] The air intake switch mechanism includes an air intake hole (5), a buoyancy plug (6), and a limiting part (7). The air intake hole (5) is located on the pipe wall of the water conveying body (1), connecting the water conveying cavity (2) with the outside atmosphere. The opening height of the air intake hole (5) corresponds to the preset water supply stop warning liquid level (13). In this embodiment, the diameter of the air intake hole (5) is 0.8 mm, and the ratio of the total ventilation area to the cross-sectional area of ​​the water conveying cavity (2) is 0.15.

[0034] The buoyancy plug (6) is a C-shaped hollow plastic structure with an overall density of approximately 0.4 g / cm³, which is much less than the density of water, allowing it to float easily on the liquid surface. The opening of the buoyancy plug (6) is fitted around the outer periphery of the water conveying body (1) and can slide up and down along the axial direction of the water conveying body (1). The inner side of the buoyancy plug (6) is provided with a hemispherical sealing protrusion (6a), the position of which precisely corresponds to the position of the air inlet (5).

[0035] The limiting part (7) consists of two annular baffles integrally formed with the water conveying body (1), located above and below the air inlet (5) respectively, used to limit the up and down sliding stroke of the buoyancy sealing part (6). The upper baffle is located above the warning liquid level (13), and the lower baffle is located below the warning liquid level (13).

[0036] The specific working process of this embodiment is as follows: like Figure 2 As shown, when the liquid level in the container is higher than the warning level (13), the buoyancy sealing component (6) is lifted by buoyancy and floats to the upper limit stop. At this time, the sealing protrusion (6a) on the inner side of the buoyancy sealing component (6) is aligned with and pressed tightly on the air inlet (5), completely sealing the air inlet (5) and making the water conveying cavity (2) a completely sealed chamber. At this time, water is drawn in at the top negative pressure end (4), and a stable negative pressure is formed in the pipe. The external atmospheric pressure forces the water at the bottom of the container from the bottom immersion end (3) into the water conveying cavity (2), and finally flows out from the top negative pressure end (4), realizing normal water conveyance.

[0037] like Figure 1As shown, when the liquid level in the container drops below the warning level (13), the buoyancy sealing element (6) loses buoyancy and slides down to the lower limit stop under its own weight. At this time, the sealing protrusion (6a) leaves the air inlet (5), the air inlet (5) is fully exposed, and the water delivery cavity (2) is connected to the outside atmosphere through the air inlet (5). If water is then drawn in at the top negative pressure end (4), air will preferentially enter the pipe from the air inlet (5), and it will be impossible to form a sufficient negative pressure to continuously deliver water from the bottom immersion end to the top negative pressure end, thus completely stopping the water delivery and accurately achieving liquid level control.

[0038] When water is added to the container and the liquid level exceeds the warning level (13) again, the buoyancy sealing component (6) floats up again, and the sealing protrusion (6a) re-seals the air inlet (5). The device automatically resumes normal water supply function without any manual operation.

[0039] Example 2 This embodiment is another preferred implementation, which achieves the water shut-off function by blocking the liquid flow channel, such as... Figures 3 to 6 As shown, it includes a water conveying body (1), a buoyancy sealing component (6), and a shell (12).

[0040] The water conveying body (1) is a food-grade rigid tubular structure with a water conveying cavity (2) that runs from end to end. Its lower end has a bottom immersion end (3) that communicates with the water conveying cavity (2), and its upper end has a top negative pressure end (4) that communicates with the water conveying cavity (2). A cut-off hole (1a) is provided on the side wall of the water conveying body (1), and the opening height of the cut-off hole (1a) corresponds to the preset stop water conveying warning liquid level (13).

[0041] The buoyancy sealing component (6) includes a float (6c), a connecting rod (6d), and a sealing part (6b) connected in sequence. The float (6c) is a hollow plastic ball with an overall density of about 0.3 g / cm³, which is much less than the density of water. The sealing part (6b) is a conical structure that is adapted to the shape of the cut-off hole (1a) and can be tightly embedded in the cut-off hole (1a) to achieve a seal.

[0042] The outer shell (12) is a box-shaped structure with openings at both ends, fixedly fitted around the outer periphery of the water conveying body (1), and also serves as a limiting part (7). The interior of the outer shell (12) has a guide groove, along which the connecting rod (6d) of the buoyancy sealing member (6) can slide up and down, thereby limiting the travel of the buoyancy sealing member (6) and allowing the sealing part (6b) to switch only between the sealing state embedded in the cut-off hole (1a) and the open state removed from the cut-off hole (1a). Multiple through holes are provided on the side wall of the outer shell (12) to allow liquid to freely enter and exit, keeping the liquid level inside the outer shell synchronized with the external liquid level.

[0043] The specific working process of this embodiment is as follows: like Figure 5 and Figure 6 As shown, when the liquid level in the container is higher than the warning level (13), the float (6c) is lifted by buoyancy and slides upward along the guide groove, causing the sealing part (6b) to leave the cut-off hole (1a) on the side wall of the water conveying body (1), and the water conveying cavity (2) forms a completely open channel. At this time, water is drawn in at the top negative pressure end (4), and a stable negative pressure is formed in the pipe. The external atmospheric pressure forces the water at the bottom of the container into the water conveying cavity (2) from the bottom immersion end (3), and finally flows out from the top negative pressure end (4), realizing normal water conveyance.

[0044] like Figure 3 and Figure 4 As shown, when the liquid level in the container drops below the warning level (13), the float (6c) loses its buoyancy support and slides downward along the guide groove under its own weight, causing the sealing part (6b) to be aligned and tightly embedded in the cut-off hole (1a), completely blocking the liquid flow channel of the water delivery cavity (2). At this time, when water is drawn in at the top negative pressure end (4), since the water delivery cavity has been physically blocked, a continuous negative pressure channel cannot be formed. Therefore, water cannot be continuously transported from the bottom immersion end to the top negative pressure end, completely stopping the water delivery and accurately achieving liquid level control.

[0045] When water is added to the container and the liquid level exceeds the warning level (13) again, the float (6c) rises again, causing the sealing part (6b) to leave the cut-off hole (1a), the water delivery cavity (2) is restored to open, and the device automatically resumes normal water delivery function without any manual operation.

[0046] It should be specifically noted that the scope of protection of this invention is not limited to the above embodiments. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this invention shall still fall within the scope of protection of this invention. For example, the limiting part can adopt a protruding structure integrally formed with the water conveying body, without the need for an additional limiting sleeve; the buoyancy sealing component can adopt a combination structure of a split float and a plug, and the sealing and avoidance of the air inlet can be achieved through lever transmission; the air inlet can be connected to the water conveying cavity through a bypass pipe, rather than being directly opened on the wall of the water conveying body. These alternative solutions all fall within the scope of protection of this invention.

Claims

1. A purely physical negative pressure water control device with controllable liquid level, characterized in that, It includes the main water supply body (1) and the water cut-off mechanism; The water conveying body (1) has a water conveying inner cavity (2) that runs from end to end. One end of the cavity is a bottom immersion end (3) for immersing into the liquid to be conveyed, and the other end is a top negative pressure end (4) for connecting to a negative pressure source. The water cut-off mechanism can switch the water delivery cavity (2) to a state where the liquid level in the environment where the bottom immersion end (3) is located drops to a preset warning level (13) when the liquid level drops to a preset warning level (13). This state prevents the top negative pressure end (4) from forming a negative pressure sufficient to continuously deliver liquid from the bottom immersion end (3) to the top negative pressure end (4).

2. The liquid level controllable purely physical negative pressure water control device according to claim 1, characterized in that, The water-cutting mechanism prevents the water-transporting cavity (2) from forming an effective negative pressure by blocking the liquid flow channel of the water-transporting cavity (2) or by connecting the water-transporting cavity (2) to the outside atmosphere.

3. The liquid level controllable purely physical negative pressure water control device according to claim 2, characterized in that, The water cut-off mechanism includes an air intake cut-off mechanism; the air intake cut-off mechanism includes an air intake hole (5), a buoyancy sealing component (6), and a limiting part (7); The air inlet (5) connects the water delivery cavity (2) with the outside atmosphere, and its opening position corresponds to the preset warning liquid level (13); The density of the buoyancy sealing component (6) is less than that of the liquid to be transported, and it can move with the change of liquid level. The limiting part (7) is used to limit the movement of the buoyancy sealing member (6), so that the buoyancy sealing member (6) can only switch between the blocking state of blocking the air inlet (5) and the opening state of avoiding the air inlet (5).

4. The liquid level controllable purely physical negative pressure water control device according to claim 3, characterized in that, The air inlet (5) is opened on the wall of the water conveying body (1); the buoyancy sealing component (6) is a C-shaped, U-shaped, ring-shaped, spherical or sheet-like structure, and is sleeved on or adjacent to the water conveying body (1).

5. The liquid level controllable purely physical negative pressure water control device according to claim 3, characterized in that, The limiting part (7) includes a limiting sleeve coaxially sleeved around the water conveying body (1), and an annular chamber for the buoyancy sealing member (6) to move is formed between the limiting sleeve and the water conveying body (1); the two ends of the limiting sleeve are provided with limiting stops, and the limiting stops are provided with a conductive structure for free flow of liquid; the limiting part (7) may also be a protrusion structure, a side guard structure or a limiting frame structure.

6. The liquid level controllable purely physical negative pressure water control device according to claim 3, characterized in that, The inner side of the buoyancy sealing component (6) is provided with a sealing protrusion (6a). The position of the sealing protrusion (6a) corresponds to the position of the air inlet (5). When the buoyancy sealing component (6) is in a blocking state, the sealing protrusion (6a) is embedded or fits the air inlet (5) to block the air inlet (5).

7. The liquid level controllable purely physical negative pressure water control device according to claim 3, characterized in that, The number of air inlets (5) is at least one, and the ratio of the total ventilation area of ​​all air inlets (5) to the cross-sectional area of ​​the water conveying cavity (2) is 0.1 to 0.

3.

8. The liquid level controllable purely physical negative pressure water control device according to claim 1, characterized in that, The negative pressure source is the human oral cavity.

9. A negative pressure water control accessory, characterized in that, The device includes a purely physical negative pressure water control device with controllable liquid level as described in any one of claims 18; the bottom immersion end (3) and / or the top negative pressure end (4) of the water conveying body (1) are provided with a connection structure for connecting to an external pipeline.

10. A drinking water appliance, characterized in that, The device comprises a purely physical negative pressure water control device with controllable liquid level as described in any one of claims 18; the water delivery body (1) is a drinking straw.

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