Humidifying tank

Abstract

The utility model relates to a humidifying tank which comprises a shell provided with a liquid inlet hole and a liquid storage cavity. At least part of the first floater is contained in the liquid storage cavity, a buffering cavity is defined by the first floater, a liquid guide hole is formed in the first floater, and the liquid storage cavity and the buffering cavity are communicated through the liquid guide hole; at least part of the second floater is contained in the buffering cavity; the sealing piece can abut against the second floater; when the first floater is normal and liquid in the liquid storage cavity reaches a first liquid level, the first floater pushes the second floater under the action of buoyancy to enable the sealing piece to block the liquid inlet hole; when the first floater loses efficacy, liquid in the liquid storage cavity enters the buffer storage cavity through the liquid guide hole and the liquid in the buffer storage cavity reaches the second liquid level, the second floater enables the sealing piece to block the liquid inlet hole under the action of buoyancy. Therefore, the first floater and the second floater can jointly form double insurance for preventing excessive liquid in the liquid storage cavity, and the use safety of the humidifying tank is further improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a humidifier. Background Technology

[0002] Humidifiers are an essential component of ventilators or respiratory systems. They warm and humidify inhaled air, thus preventing and reducing secondary respiratory infections in mechanically ventilated patients, as well as irritation to the cardiopulmonary system, and keeping the alveoli moist. They also reduce heat and respiratory moisture loss, making it less prone to sputum buildup and decreasing the viscosity of secretions, promoting expectoration. During use, it's common to add an appropriate amount of water to the humidifier. However, with traditional humidifiers, adding too much water can cause the control valve to fail to close automatically, potentially leading to medical accidents and ultimately compromising the safety of humidifier use. Utility Model Content

[0003] One of the technical problems addressed by this application is how to improve the safety of using humidification tanks.

[0004] A humidification tank, comprising:

[0005] The shell has a liquid inlet and a liquid storage cavity;

[0006] A first float is at least partially housed within the liquid storage cavity. The first float forms a buffer cavity and has a liquid guiding hole, which connects the liquid storage cavity and the buffer cavity.

[0007] The second float is at least partially housed within the buffer cavity; and

[0008] The seal is capable of abutting against the second float;

[0009] When the first float is functioning normally and the liquid in the storage chamber reaches the first liquid level, the first float pushes the second float under the action of buoyancy to block the inlet hole with the seal; when the first float fails and the liquid in the storage chamber enters the buffer chamber through the guide hole and the liquid in the buffer chamber reaches the second liquid level, the second float blocks the inlet hole with the action of buoyancy.

[0010] In one embodiment, the first float is further provided with a sliding hole communicating with the buffer cavity. The diameter of the sliding hole is smaller than the diameter of the buffer cavity, and the sliding hole is closer to the liquid inlet hole than the buffer cavity. The second float slides in cooperation with the sliding hole.

[0011] In one embodiment, the first float includes a first floating part and a guide part, the guide part protruding from the first floating part, the first floating part surrounding the buffer cavity, the liquid guiding hole being disposed in the first floating part, and the sliding hole being located in the guide part; the second float includes a second floating part, a sliding part, and a limiting part, the sealing member being disposed in the limiting part, the sliding part being connected between the second floating part and the limiting part and slidingly engaging with the sliding hole, the second floating part being located in the buffer cavity, and the limiting part having a limiting surface surrounding the sliding part and capable of abutting against the guide part.

[0012] In one embodiment, the first float further includes a shielding portion connected to the first floating portion or the guide portion. The connection point between the shielding portion and the first floating portion or the guide portion is closer to the liquid inlet relative to the liquid guide hole, and the orthogonal projection of the shielding portion along the axis of the sliding hole can cover the liquid guide hole.

[0013] In one embodiment, the first floating part includes a floating section and a covering section, the covering section being connected between the guide part and the floating section, the liquid guiding hole being formed in the floating section, and the orthogonal projection of the covering section along the axial direction of the sliding hole being able to cover the liquid guiding hole.

[0014] In one embodiment, the housing includes a protrusion surrounding the liquid inlet, the protrusion forming a positioning cavity communicating with the liquid inlet and the liquid storage cavity, and the guide portion extending into the positioning cavity.

[0015] In one embodiment, the second float includes a floating body and a blocking ring. The sealing element is disposed on the floating body, the floating body is slidably engaged with the sliding hole, and the blocking ring protrudes from the floating body. The first float can abut against the blocking ring to push the second float closer to the liquid inlet. The sliding hole is located in the gap between the first float and the floating body to form the liquid guide hole, or the liquid guide hole is spaced apart from the sliding hole. The orthogonal projection of the blocking ring along the axial direction of the sliding hole can cover the liquid guide hole.

[0016] In one embodiment, the second float has a recessed groove on its surface facing the liquid inlet, and the seal engages with the groove.

[0017] In one embodiment, the seal has a sealing surface, the housing has an abutting surface, the liquid inlet hole penetrates the abutting surface, and the sealing surface abuts against the abutting surface to block the liquid inlet hole; both the sealing surface and the abutting surface are planar, or one of the sealing surface and the abutting surface is an outwardly convex surface and the other is an inwardly concave surface.

[0018] In one embodiment, at least one of the following schemes is also included:

[0019] The housing includes an outer shell and a heating base connected to each other. The liquid inlet is disposed in the outer shell. The first float and the second float are able to move away from the heating base under the action of buoyancy.

[0020] The liquid guide hole is closer to the liquid inlet hole than the first liquid level. When the liquid level in the storage chamber reaches the position of the liquid guide hole, the liquid in the storage chamber enters the buffer chamber through the liquid guide hole.

[0021] The first float or the second float includes a shielding unit, the shielding unit covering the liquid guide hole by its orthogonal projection along the axial direction of the liquid inlet hole, the shielding unit being closer to the liquid inlet hole than the liquid guide hole.

[0022] One technical effect of one embodiment of this application is that, when the first float is functioning normally, when the liquid level reaches the first liquid level, the first float will drive the second float to move synchronously and cause the seal to block the liquid inlet, thereby preventing the addition of liquid into the storage chamber through the liquid inlet, thus avoiding medical accidents caused by excessive liquid in the storage chamber and improving the safety of the humidification tank. However, if the first float fails, when the liquid level in the storage chamber exceeds the first liquid level and continues to rise to a specific position, the liquid in the storage chamber enters the buffer chamber through the liquid guide hole. As the liquid level in the buffer chamber rises, the second float and the seal move closer to the liquid inlet under the action of buoyancy. When the liquid in the buffer chamber reaches the second liquid level, the seal will block the liquid inlet, thereby preventing the addition of liquid into the storage chamber through the liquid inlet, thus avoiding medical accidents caused by excessive liquid and improving the safety of the humidification tank. Therefore, by setting up a second float, even if the first float fails, the second float can still prevent excessive liquid in the storage chamber. Thus, the first float and the second float together form a double insurance against excessive liquid in the storage chamber, thereby further improving the safety of the humidification tank. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of a humidification tank provided in one embodiment.

[0024] Figure 2 for Figure 1 The diagram shows the exploded structure of the humidification tank.

[0025] Figure 3 for Figure 1 The diagram shows a three-dimensional cross-sectional view of the humidification tank.

[0026] Figure 4 for Figure 1The diagram shows a planar cross-sectional view of the humidification tank when the liquid in the storage chamber is at the first liquid level.

[0027] Figure 5 for Figure 1 The diagram shows a planar cross-sectional view of the humidification tank when the liquid in the buffer chamber is at the second liquid level.

[0028] Figure 6 for Figure 1 A partial planar cross-sectional view of the humidification tank is shown.

[0029] Figure 7 A partial planar cross-sectional view of the humidification tank provided for another embodiment.

[0030] Figure 8 This is a partial planar cross-sectional view of the humidification tank provided in another embodiment.

[0031] Reference numerals: humidification tank 10, first liquid level 11, second liquid level 12, shell 300, liquid inlet 310, liquid storage chamber 320, outer shell 330, protrusion 331, positioning cavity 332, heating seat 340, contact surface 350; first float 100, first floating part 110, buffer cavity 111, liquid guide hole 112, floating section 113, covering section 114, guide part 120, sliding hole 121, shielding part 130, second float 200, second floating part 210, sliding part 220, limiting part 230, limiting surface 231, floating body 240, blocking ring 250, groove 260, seal 400, sealing surface 410. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0034] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0038] See Figure 1 , Figure 2 and Figure 3 A humidifier 10 provided in one embodiment of this application can be applied to a ventilator or respiratory system, i.e., the ventilator includes the humidifier 10. The humidifier 10 includes a first float 100, a second float 200, a housing 300, and a sealing element 400. The housing 300 has a liquid inlet 310 and a liquid storage chamber 320. The liquid storage chamber 320 is used to store liquid. External liquid can enter the liquid storage chamber 320 through the liquid inlet 310, i.e., liquid can be replenished into the liquid storage chamber 320 through the liquid inlet 310. The first float 100 is at least partially housed in the liquid storage chamber 320. The first float 100 can float under the buoyancy of the liquid in the liquid storage chamber 320. As the liquid level in the liquid storage chamber 320 rises, the first float 100 will move closer to the liquid inlet 310. The second float 200 is at least partially housed within the buffer cavity 111. The second float 200 can float under the buoyancy of the liquid in the buffer cavity 111. As the liquid level in the buffer cavity 111 rises, the second float 200 will move closer to the liquid inlet 310.

[0039] See Figure 3 , Figure 4 and Figure 5In some embodiments, the first float 100 forms a buffer cavity 111, and the first float 100 is provided with a liquid guiding hole 112, which communicates with both the buffer cavity 111 and the storage cavity 320. When liquid is added through the liquid inlet 310, the liquid enters the storage cavity 320, thus replenishing the liquid in the storage cavity 320. As the liquid level in the storage cavity 320 gradually rises, the liquid in the storage cavity 320 enters the buffer cavity 111 through the liquid guiding hole 112. The sealing member 400 can abut against the second float 200, and when there is liquid in the buffer cavity 111, the second float 200 can push the sealing member 400 to move. For example, when the liquid level in the storage cavity 320 gradually rises and reaches the position of the liquid guiding hole 112, the liquid in the storage cavity 320 will enter the buffer cavity 111 through the liquid guiding hole 112. For example, a valve can be installed at the liquid guide hole 112. When the liquid level in the liquid storage chamber 320 rises to a certain position, the valve opens under the action of the liquid pressure in the liquid storage chamber 320, thus opening the liquid guide hole 112, so that the liquid in the liquid storage chamber 320 will enter the buffer chamber 111 through the liquid guide hole 112.

[0040] It is understandable that, for example, the seal 400 can be directly fixed to the second float 200, so that the seal 400 always moves synchronously with the second float 200. Alternatively, the seal 400 may not be fixedly connected to the second float 200, and the two can remain relatively independent. The seal 400 can be connected to the housing 300. In the initial stage of the second float 200 moving closer to the liquid inlet 310, the seal 400 can remain stationary, and the second float 200 floats upward relative to the seal 400. When the second float 200 and the seal 400 come into contact and generate an upward force towards the liquid inlet 310, that is, when the second float 200 and the seal 400 come into contact, the seal 400 can undergo elastic deformation to move closer to the liquid inlet 310, or the second float 200 can push the entire seal 400 closer to the liquid inlet 310.

[0041] See Figure 3 , Figure 4 and Figure 5When the first float 100 is functioning normally, during the continuous addition of liquid to the storage chamber 320 through the inlet port 310, the liquid will temporarily be unable to enter the buffer chamber 111 through the guide port 112. Therefore, the storage chamber 320 contains liquid while the buffer chamber 111 does not. When the liquid level in the storage chamber 320 reaches a certain height, the first float 100 floats, while the second float 200 cannot float because there is no liquid in the buffer chamber 111. As the liquid level in the storage chamber 320 rises, the first float 100, under the action of buoyancy, drives the second float 200 and the sealing element 400 to move closer to the inlet port 310. When the liquid level in the storage chamber 320 reaches the first liquid level 11, the sealing element 400 blocks the inlet port 310. This prevents further addition of liquid to the storage chamber 320 through the inlet port 310, avoiding excessive liquid and potential medical accidents, and improving the safety of the humidification tank 10. Of course, during the process of the liquid reaching the first liquid level 11, the liquid in the storage chamber 320 still cannot enter the buffer chamber 111 through the liquid guide hole 112, and the second float 200 cannot float because there is no liquid in the buffer chamber 111.

[0042] See Figure 3 , Figure 4 and Figure 5 In the event that the first float 100 fails to float, as the liquid level in the storage chamber 320 continues to rise, when the liquid level in the storage chamber 320 reaches a specific position greater than the first liquid level 11, the liquid in the storage chamber 320 will enter the buffer chamber 111 through the liquid guide hole 112. As the liquid level in the buffer chamber 111 continues to rise, the second float 200 and the seal 400 move closer to the liquid inlet hole 310 under the action of buoyancy. When the liquid in the buffer chamber 111 reaches the second liquid level 12, the seal 400 will block the liquid inlet hole 310, thereby preventing the addition of liquid to the storage chamber 320 through the liquid inlet hole 310, avoiding excessive liquid and medical accidents, and improving the safety of the humidification tank 10.

[0043] See Figure 3 , Figure 4 and Figure 5In some embodiments, for example, the liquid guide hole 112 is normally open and its position is higher than the first liquid level 11. When the liquid level in the storage chamber 320 gradually rises and reaches the position of the liquid guide hole 112, the liquid in the storage chamber 320 will enter the buffer chamber 111 through the liquid guide hole 112. Alternatively, a valve can be installed at the liquid guide hole 112. When the valve is closed, the liquid guide hole 112 is blocked. The position of the liquid guide hole 112 can be lower than the position of the first liquid level 11. When the liquid level in the storage chamber 320 gradually rises and reaches a specific position higher than the first liquid level 11, under the action of the liquid pressure in the storage chamber 320, the valve opens, opening the liquid guide hole 112, allowing the liquid in the storage chamber 320 to enter the buffer chamber 111 through the liquid guide hole 112. Of course, the height of the first liquid level 11 can be less than the height of the second liquid level 12. In other embodiments, the height of the first liquid level 11 can also be greater than or equal to the height of the second liquid level 12.

[0044] If only the first float 100 is used, and the first float 100 fails and cannot float with the liquid, that is, as the liquid level rises, the first float 100 still cannot move close to the liquid inlet 310. Therefore, in the case of excessive liquid, the first float 100 still cannot block the liquid inlet 310, allowing the liquid to continuously replenish the liquid storage chamber 320 from the liquid inlet 310. This leads to an extreme excess of liquid in the liquid storage chamber 320, causing a medical accident and ultimately affecting the safety of the humidification tank 10.

[0045] See Figure 3 , Figure 4 and Figure 5Regarding the humidification tank 10 in the above embodiment, when the first float 100 is working properly and the liquid level reaches the first liquid level 11, the first float 100 will drive the second float 200 to move synchronously and cause the sealing member 400 to block the liquid inlet hole 310. As a result, liquid cannot be added to the liquid storage chamber 320 through the liquid inlet hole 310, thus avoiding medical accidents caused by excessive liquid in the liquid storage chamber 320 and improving the safety of using the humidification tank 10. In the event of failure of the first float 100, when the liquid level in the storage chamber 320 exceeds the first liquid level 11 and continues to rise to a specific position, the liquid in the storage chamber 320 enters the buffer chamber 111 through the liquid guide hole 112. As the liquid level in the buffer chamber 111 rises, the second float 200 and the seal 400 move closer to the liquid inlet hole 310 under the action of buoyancy. When the liquid in the buffer chamber 111 reaches the second liquid level 12, the seal 400 will block the liquid inlet hole 310, thereby preventing the addition of liquid to the storage chamber 320 through the liquid inlet hole 310, avoiding excessive liquid and causing medical accidents, and improving the safety of the humidification tank 10. Therefore, by setting the second float 200, even if the first float 100 fails, the second float 200 can still play the role of preventing excessive liquid in the liquid storage chamber 320. Thus, the first float 100 and the second float 200 can together form a double insurance against excessive liquid in the liquid storage chamber 320, thereby further improving the safety of the humidification tank 10.

[0046] See Figure 3 , Figure 4 and Figure 5 In some embodiments, the housing 300 includes an outer shell 330 and a heating base 340, which are connected to each other. A liquid inlet 310 is disposed on the outer shell 330, which forms a liquid storage cavity 320. When there is no liquid in the liquid storage cavity 320 and the buffer cavity 111, both the first float 100 and the second float 200 can contact the heating base 340. When the first float 100 and the second float 200 float, they can move away from the heating base 340. The heating base 340 can heat the liquid in the liquid storage cavity 320, thereby giving the liquid a certain temperature.

[0047] See Figure 3 , Figure 4 and Figure 5The outer casing 330 includes a protrusion 331 that forms a positioning cavity 332. The positioning cavity 332 connects the liquid inlet 310 and the liquid storage cavity 320. Liquid in the liquid inlet 310 can flow into the liquid storage cavity 320 through the positioning cavity 332. A first float 100 extends into the positioning cavity 332, allowing the first float 100 to slide relative to the positioning cavity 332. Of course, the first float 100 and the positioning cavity 332 are in a clearance fit, so that the liquid inlet 310 is effectively connected to the liquid storage cavity 320 through the positioning cavity 332. Consequently, liquid in the liquid inlet 310 can enter the liquid storage cavity 320 through the gap in the positioning cavity 332 that is not filled by the first float 100. That is, liquid in the liquid inlet 310 enters the liquid storage cavity 320 through the gap between the first float 100 and the protrusion 331, thereby effectively replenishing the liquid in the liquid storage cavity 320. Meanwhile, the positioning cavity 332 can play a good guiding and limiting role in the sliding of the first float 100, preventing the first float 100 from drifting, improving the motion accuracy of the first float 100, and effectively ensuring that the first float 100 drives the second float 200 to move and that the sealing element 400 can block the liquid inlet hole 310.

[0048] See Figure 3 , Figure 4 and Figure 5 In some embodiments, the first float 100 is further provided with a sliding hole 121, which communicates with the buffer cavity 111. The diameter of the sliding hole 121 can be smaller than the diameter of the buffer cavity 111, and the sliding hole 121 is closer to the liquid inlet 310 than the buffer cavity 111. The second float 200 slides in conjunction with the sliding hole 121. The sliding hole 121 can effectively guide and limit the sliding of the second float 200, prevent the second float 200 from drifting, improve the motion accuracy of the second float 200, and enable the sealing member 400 to block the liquid inlet 310.

[0049] See Figure 3 , Figure 4 and Figure 5In some embodiments, the first float 100 includes a first floating portion 110 and a guide portion 120. The first floating portion 110 surrounds a buffer cavity 111. A liquid guiding hole 112 is disposed on the first floating portion 110, and a sliding hole 121 is disposed on the guide portion 120. The second float 200 includes a second floating portion 210, a sliding portion 220, and a limiting portion 230. A sealing member 400 is disposed on the limiting portion 230. One end of the sliding portion 220 is connected to the limiting portion 230, and the other end of the sliding portion 220 is connected to the second floating portion 210, that is, the sliding portion 220 is connected between the second floating portion 210 and the limiting portion 230. The sliding portion 220 slides in conjunction with the sliding hole 121, and the second floating portion 210 is located in the buffer cavity 111. The second floating part 210 can have the largest cross-sectional dimension, followed by the limiting part 230, and the sliding part 220 can have the smallest cross-sectional dimension. The second floating part 210, the sliding part 220, and the limiting part 230 can be coaxially arranged. The limiting part 230 has a limiting surface 231, which is annular and surrounds the sliding part 220. When the second float 200 is not floating, the guide part 120 of the first float 100 can abut against the limiting surface 231. Thus, when liquid is injected into the liquid inlet 310, since the guide part 120 abuts against the limiting surface 231, the guide part 120 and the limiting surface 231 together form a blocking effect on the sliding hole 121. Liquid in the positioning cavity 332 will not be able to flow into the buffer cavity 111 through the sliding hole 121, thus avoiding unnecessary floating of the second float 200 due to the presence of liquid in the buffer cavity 111. On the other hand, when the first float 100 floats near the liquid inlet 310, the guide portion 120 of the first float 100 will push the limiting portion 230 and the entire second float 200 near the liquid inlet 310 through the limiting surface 231, thereby causing the first float 100 to drive the second float 200 to move synchronously and ensuring that the sealing member 400 blocks the liquid inlet 310.

[0050] In some embodiments, the first float 100 or the second float 200 includes a blocking unit, the orthographic projection of which covers the liquid guide hole 112 along the axial direction of the liquid inlet 310. The axial direction of the liquid inlet 310 can also be understood as the axial direction of the sliding hole 121. The blocking unit is closer to the liquid inlet 310 than the liquid guide hole 112, meaning it blocks the liquid guide hole 112 from entering the buffer chamber 111 during the process of liquid flowing from the liquid inlet 310 into the storage chamber 320.

[0051] See Figure 6For example, the first float 100 also includes a blocking portion 130, which forms the aforementioned blocking unit. The blocking portion 130 is connected to the first floating portion 110 or the guide portion 120. The connection point between the blocking portion 130 and the first floating portion 110 or the guide portion 120 is closer to the inlet hole 310 than the liquid guide hole 112. The orthogonal projection of the blocking portion 130 along the axial direction of the sliding hole 121 can cover the liquid guide hole 112. In simpler terms, the blocking portion 130 can provide a certain covering effect on the liquid guide hole 112 from above. For example, the blocking portion 130 can be connected to the connection point of the first floating portion 110 and the guide portion 120, so that the blocking portion 130 can be arranged around the first floating portion 110. During the process of liquid flowing from the inlet hole 310 into the storage chamber 320, due to the covering effect of the shielding part 130 on the guide hole 112, the liquid will not be able to enter the buffer chamber 111 through the guide hole 112, thus avoiding unnecessary floating of the second float 200 caused by the presence of liquid in the buffer chamber 111.

[0052] See Figure 7 For example, the first floating section 110 includes a floating section 113 and a covering section 114. The covering section 114 forms the aforementioned shielding unit. The cross-sectional dimension of the covering section 114 can be larger than that of the floating section 113. The covering section 114 is connected between the guide section 120 and the floating section 113, making the covering section 114 closer to the liquid inlet 310 relative to the floating section 113. It can be simply understood that the covering section 114 is located above the floating section 113. The liquid guide hole 112 is opened in the floating section 113, and the orthogonal projection of the covering section 114 along the axial direction of the sliding hole 121 can cover the liquid guide hole 112. Similarly, during the process of liquid flowing from the liquid inlet 310 into the liquid storage chamber 320, due to the covering effect of the covering section 114 on the liquid guide hole 112, the liquid will not be able to enter the buffer chamber 111 through the liquid guide hole 112, thus avoiding unnecessary floating of the second float 200 caused by the presence of liquid in the buffer chamber 111.

[0053] See Figure 8For example, the second float 200 includes a floating body 240 and a blocking ring 250. The blocking ring 250 forms the aforementioned shielding unit. A sealing element 400 is disposed on the floating body 240. The floating body 240 is slidably engaged with the sliding hole 121. The blocking ring 250 protrudes radially from the floating body 240, thus surrounding the floating body 240. The first float 100 can abut against the blocking ring 250. When the first float 100 moves, it pushes the second float 200 closer to the liquid inlet 310 via the blocking ring 250, thereby causing the sealing element 400 on the second float 200 to block the liquid inlet 310. The sliding hole 121 forms a liquid guide hole 112 in the gap between the first float 100 and the floating body 240. That is, the gap in the sliding hole 121 that is not filled by the floating body 240 forms the liquid guide hole 112, meaning the liquid guide hole 112 is part of the sliding hole 121. Of course, the liquid guide hole 112 is spaced apart from the sliding hole 121, allowing them to be independent of each other. The orthogonal projection of the blocking ring 250 along the axial direction of the sliding hole 121 can cover the liquid guide hole 112. Similarly, during the process of liquid flowing from the inlet hole 310 into the storage chamber 320, due to the covering effect of the blocking ring 250 on the liquid guide hole 112, the liquid will not be able to enter the buffer chamber 111 through the liquid guide hole 112, thus preventing unnecessary floating of the second float 200 due to the presence of liquid in the buffer chamber 111.

[0054] See Figure 6 In some embodiments, the second float 200 is provided with a groove 260, which is disposed on the surface of the second float 200 facing the liquid inlet 310, and the seal 400 mates with the groove 260. This allows the groove 260 to effectively limit the seal 400 and also improves the connection strength between the seal 400 and the second float 200, thereby improving the installation efficiency, accuracy, and reliability of the seal 400.

[0055] See Figure 3 In some embodiments, the seal 400 has a sealing surface 410, and the housing 300 has an abutment surface 350. The liquid inlet 310 penetrates the abutment surface 350, creating an opening in the abutment surface 350. When the sealing surface 410 and the abutment surface 350 come into contact, the seal 400 effectively seals the liquid inlet 310. For example, both the sealing surface 410 and the abutment surface 350 can be planar. Alternatively, one of the sealing surface 410 and the abutment surface 350 can be convex and the other concave; that is, the sealing surface 410 can be convex and the abutment surface 350 can be concave. Or, the sealing surface 410 can be concave and the abutment surface 350 can be convex.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A humidification tank, characterized in that, include: The shell has a liquid inlet and a liquid storage cavity; A first float is at least partially housed within the liquid storage cavity. The first float forms a buffer cavity and has a liquid guiding hole, which connects the liquid storage cavity and the buffer cavity. The second float is at least partially housed within the buffer cavity; and The sealing element is capable of abutting against the second float; When the first float is functioning normally and the liquid in the storage chamber reaches the first liquid level, the first float pushes the second float under the action of buoyancy to block the inlet hole with the seal; when the first float fails and the liquid in the storage chamber enters the buffer chamber through the guide hole and the liquid in the buffer chamber reaches the second liquid level, the second float blocks the inlet hole with the action of buoyancy.

2. The humidification tank according to claim 1, characterized in that, The first float also has a sliding hole communicating with the buffer cavity. The diameter of the sliding hole is smaller than the diameter of the buffer cavity, and the sliding hole is closer to the liquid inlet hole than the buffer cavity. The second float slides in conjunction with the sliding hole.

3. The humidification tank according to claim 2, characterized in that, The first float includes a first floating part and a guide part, the guide part protruding from the first floating part and the first floating part surrounding the buffer cavity, the liquid guiding hole being disposed in the first floating part, and the sliding hole being located in the guide part; the second float includes a second floating part, a sliding part and a limiting part, the sealing member being disposed in the limiting part, the sliding part being connected between the second floating part and the limiting part and slidingly engaging with the sliding hole, the second floating part being located in the buffer cavity, and the limiting part having a limiting surface surrounding the sliding part and capable of abutting against the guide part.

4. The humidification tank according to claim 3, characterized in that, The first float further includes a shielding part, which is connected to the first floating part or the guide part. The connection between the shielding part and the first floating part or the guide part is closer to the liquid inlet hole than the liquid guide hole, and the orthogonal projection of the shielding part along the axis of the sliding hole can cover the liquid guide hole.

5. The humidification tank according to claim 3, characterized in that, The first floating part includes a floating section and a covering section. The covering section is connected between the guide part and the floating section. The liquid guiding hole is opened in the floating section. The orthogonal projection of the covering section along the axis of the sliding hole can cover the liquid guiding hole.

6. The humidification tank according to claim 3, characterized in that, The housing includes a protrusion surrounding the liquid inlet, the protrusion forming a positioning cavity communicating with the liquid inlet and the liquid storage cavity, and the guide portion extending into the positioning cavity.

7. The humidification tank according to claim 2, characterized in that, The second float includes a floating body and a blocking ring. The sealing element is disposed on the floating body. The floating body is slidably engaged with the sliding hole. The blocking ring protrudes from the floating body. The first float can abut against the blocking ring to push the second float closer to the liquid inlet. The sliding hole is located in the gap between the first float and the floating body to form the liquid guide hole, or the liquid guide hole is spaced apart from the sliding hole. The orthogonal projection of the blocking ring along the axial direction of the sliding hole can cover the liquid guide hole.

8. The humidification tank according to claim 1, characterized in that, The second float has a recessed groove on its surface facing the liquid inlet, and the seal engages with the groove.

9. The humidification tank according to claim 1, characterized in that, The sealing element has a sealing surface, the housing has an abutting surface, the liquid inlet hole penetrates the abutting surface, and the sealing surface abuts against the abutting surface to block the liquid inlet hole; both the sealing surface and the abutting surface are planar, or one of the sealing surface and the abutting surface is an outwardly convex surface and the other is an inwardly concave surface.

10. The humidification tank according to claim 1, characterized in that, It also includes at least one of the following options: The housing includes an outer shell and a heating base connected to each other. The liquid inlet is disposed in the outer shell. The first float and the second float are able to move away from the heating base under the action of buoyancy. The liquid guide hole is closer to the liquid inlet hole than the first liquid level. When the liquid level in the storage chamber reaches the position of the liquid guide hole, the liquid in the storage chamber enters the buffer chamber through the liquid guide hole. The first float or the second float includes a shielding unit, the shielding unit covering the liquid guide hole by its orthogonal projection along the axial direction of the liquid inlet hole, the shielding unit being closer to the liquid inlet hole than the liquid guide hole.

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