Water tank and electric appliance

Abstract

The embodiment of the present application relates to the technical field of cleaning equipment, and particularly relates to a water tank and an electrical equipment. The water tank comprises a tank body and a negative pressure valve. The tank body is provided with at least one air permeation hole, and the air permeation hole is located above a preset uppermost water level of the tank body. The negative pressure valve is arranged in the interior of the tank body, the air permeation holes are arranged around the center of the negative pressure valve at intervals, and the projection of the negative pressure valve on the end surface of the air permeation hole covers each air permeation hole. The negative pressure valve is used for closing the air permeation hole when the negative pressure in the interior of the tank body does not reach a preset value, and opening the air permeation hole when the negative pressure in the interior of the tank body reaches the preset value, so as to form an air inlet channel with the inner wall of the tank body, and allow external air to enter the interior of the tank body through the air permeation hole. The embodiment of the present application automatically supplements air when needed, effectively prevents the accumulation of negative pressure in the water tank, and timely supplements air in the interior of the tank body through the air permeation hole along with the reduction of liquid, so as to avoid the formation of a large negative pressure or a siphon phenomenon to affect the water pump, and ensure the uniformity and stability of water outlet of the water pump.

Description

Technical Field

[0001] This application relates to the field of cleaning equipment technology, and more particularly to a water tank and electrical equipment. Background Technology

[0002] Electrical appliances (such as cleaning robots) are typically equipped with water tanks to supply water to the mop during the cleaning process. To prevent accidental leaks, these water tanks are usually designed as sealed containers. However, when the device is operating, the water pump continuously draws liquid from the sealed tank. As the liquid level decreases, the inability to replenish the gas in time leads to an imbalance in the internal pressure of the tank, creating negative pressure or a siphon effect that affects the normal operation of the water pump, resulting in a situation where water cannot be drawn (dispensed). Utility Model Content

[0003] One objective of this application is to provide a water tank and electrical equipment to solve the technical problem in the related art where, as the liquid in the water tank decreases, the inability to replenish gas in time leads to an imbalance of gas pressure inside the water tank, resulting in negative pressure or siphon phenomenon that affects the normal operation of the water pump and causes the inability to pump (discharge) water.

[0004] In a first aspect, embodiments of this application provide a water tank, comprising:

[0005] The tank body is provided with at least one vent hole, which is located above the preset maximum water level limit of the tank body;

[0006] A negative pressure valve is disposed inside the housing. The vent holes are spaced apart around the center of the negative pressure valve. The projection of the negative pressure valve on the end face of the vent holes covers each of the vent holes. The negative pressure valve is used to close the vent holes when the negative pressure inside the housing does not reach a preset value, and to open the vent holes when the negative pressure inside the housing reaches the preset value, forming an air intake channel with the inner wall of the housing, allowing external air to enter the housing through the vent holes.

[0007] Optionally, the negative pressure valve is a soft rubber component or an elastic component.

[0008] Optionally, the housing is provided with mounting holes, and the vent holes are spaced around the mounting holes with the mounting holes as the center. The negative pressure valve includes:

[0009] The valve stem passes through the mounting hole and is mounted on the housing;

[0010] A sealing cap is located inside the housing and aligned with the mounting hole; the sealing cap is connected to one end of the valve stem.

[0011] Wherein, at least one of the valve stem and the sealing cap can deform when the negative pressure inside the box reaches the preset value, or the valve stem can move a preset distance relative to the box into the box when the negative pressure inside the box reaches the preset value, so that the sealing cap opens the vent hole.

[0012] Optionally, the mounting hole is a through hole, and the valve stem is provided with a flexible flange in the circumferential direction. The flexible flange can be squeezed through the mounting hole by the inner wall of the mounting hole and abut against the edge or end face of the mounting hole from the outside of the housing.

[0013] Optionally, the other end of the valve stem is provided with a tailing material, which is used to drive the flexible flange through the mounting hole from inside the housing and is cut off after the valve stem is installed in the housing.

[0014] Optionally, the number of the ventilation holes is multiple, and the multiple ventilation holes are arranged in a ring around the center of the mounting hole.

[0015] Optionally, the sealing cap has an umbrella-shaped structure, and the center of the sealing cap is connected to one end of the valve stem;

[0016] When the negative pressure inside the box does not reach the preset value, the center of the sealing cap is recessed in a direction away from the vent hole, and the edge of the sealing cap abuts against the inner wall of the box to form a cavity inside the sealing cap that connects to the vent hole and is isolated from the inside of the box.

[0017] Optionally, the sealing cap has a thumbtack-shaped structure, and the surface of the sealing cap facing the vent hole is a flat end face;

[0018] When the negative pressure inside the box does not reach the preset value, the surface of the sealing cap facing the vent hole contacts the end face of the vent hole.

[0019] In a second aspect, embodiments of this application provide an electrical device, comprising:

[0020] Water tanks as described in any of the above items;

[0021] A water pump, connected to the water tank, is used to pump liquid from the water tank.

[0022] Optionally, the total instantaneous air intake of all the vent holes in the open state is greater than the single pumping capacity of the water pump.

[0023] The embodiments of this application achieve the following technical effects: When there is no negative pressure or positive pressure in the water tank, the negative pressure valve tightly seals the vent hole using its own structure or pressure difference. When the water pump draws water, causing the air pressure inside the water tank to be lower than the external atmospheric pressure, i.e., generating negative pressure, this pressure difference creates a suction force that pulls the negative pressure valve open, forming a temporary air intake channel between it and the inner wall of the tank. External air can then enter the water tank through the vent hole, balancing the internal and external air pressures. This embodiment of the application effectively prevents the accumulation of negative pressure in the water tank by automatically replenishing air when needed. As the liquid decreases, the tank interior replenishes gas in a timely manner through the vent hole, avoiding the formation of large negative pressures or siphon phenomena that could affect the water pump. This ensures that the water pump can operate stably and under low load, extending its lifespan and ensuring uniform and stable water output. In non-working states, such as when the user moves, inverts, or adds water, the negative pressure valve remains closed, reliably blocking the vent hole, thereby eliminating the risk of leakage and improving product safety and user experience. Attached Figure Description

[0024] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a limitation on scale.

[0025] Figure 1 A cross-sectional structural diagram of a water tank provided in an embodiment of this application;

[0026] Figure 2 for Figure 1 The first enlarged view of detail A shows the sealing and ventilation holes of the negative pressure valve.

[0027] Figure 3 for Figure 1 The second enlarged view of detail A shows the negative pressure valve opening the vent hole;

[0028] Figure 4 This is a schematic diagram of the structure of a negative pressure valve for a water tank provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the structure of a water tank provided in an embodiment of this application;

[0030] Figure 6 for Figure 5 A magnified view of detail section B.

[0031] Label Explanation:

[0032] 100. Water tank; 10. Tank body; 11. Vent hole; 111. First hole section; 112. Second hole section; 12. Mounting hole; 20. Negative pressure valve; 21. Valve stem; 211. Flexible flange; 212. Tail end material; 22. Sealing cap. Detailed Implementation

[0033] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on the other element, or one or more intermediate elements can exist between them. The terms "upper," "lower," "left," "right," "upper end," "lower end," "top," and "bottom," etc., used in this specification 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 utility model 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 utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0035] Cleaning robots and other cleaning equipment typically have water tanks to supply water to the mop during the cleaning process. To prevent accidental leaks, these tanks are usually designed as sealed containers. However, when the equipment is operating, the water pump continuously draws liquid from the sealed tank. As the liquid level decreases, the inability to replenish the gas in time leads to an imbalance in the internal pressure of the tank, creating negative pressure or a siphon effect that affects the normal operation of the pump, causing it to fail to pump water.

[0036] To address the technical problems in related technologies, in a first aspect, embodiments of this application provide a water tank for use in electrical equipment, such as a cleaning robot. The water tank is capable of storing liquids, which can be clean water or a mixture of cleaning solutions, etc.

[0037] Please refer to the following: Figures 1 to 3In some embodiments, the water tank 100 includes a tank body 10 and a negative pressure valve 20. The tank body 10 is provided with at least one vent hole 11, which is located above the preset maximum water level of the tank body 10. The negative pressure valve 20 is disposed inside the tank body 10, and the vent holes 11 are spaced apart around the center of the negative pressure valve 20. The projection of the negative pressure valve 20 on the end face of the vent holes 11 covers each vent hole 11. The negative pressure valve 20 is used to close the vent holes 11 when the negative pressure inside the tank body 10 does not reach a preset value, and to open the vent holes 11 when the negative pressure inside the tank body 10 reaches the preset value, forming an air intake channel with the inner wall of the tank body 10, allowing external air to enter the interior of the tank body 10 through the vent holes 11.

[0038] The structural principle of the water tank 100 in this embodiment is as follows: a vent hole 11 is provided above the preset maximum water level of the water tank 100, and a negative pressure valve 20 is installed at the corresponding position inside. When there is no negative pressure or there is positive pressure inside the water tank 100, the negative pressure valve 20 tightly seals the vent hole 11 by its own structure or pressure difference. When the water pump draws water, causing the air pressure inside the water tank 100 to be lower than the external atmospheric pressure, i.e., generating negative pressure, this pressure difference will form a suction force, which will pull the negative pressure valve 20 open, forming a temporary air intake channel G between it and the inner wall of the tank body 10. External air can then enter the water tank 100 through the vent hole 11 to balance the internal and external air pressure. In addition, when the water tank 100 is inverted or tilted, the negative pressure valve 20 is kept sealed to the vent hole 11 by the liquid pressure inside the tank body 10, thereby ensuring the airtightness of the entire tank body 10.

[0039] Understandably, this embodiment of the application effectively prevents the accumulation of negative pressure inside the water tank 100 by automatically replenishing air when needed. As the liquid decreases, gas is replenished in a timely manner through the vent hole 11 inside the tank 10, avoiding the formation of large negative pressure or siphon phenomenon that could affect the water pump. This ensures that the water pump can operate stably and under low load, extends the pump's lifespan, and ensures uniform and stable water output. In non-working states, such as when the user moves, inverts, or adds water, the negative pressure valve 20 remains closed, reliably blocking the vent hole 11, thereby eliminating the risk of leakage and improving product safety and user experience.

[0040] In some embodiments, the negative pressure valve 20 is a soft rubber part or an elastic part.

[0041] Understandably, the elastic material ensures that the negative pressure valve 20 fits tightly against the inner wall of the housing 10 under normal conditions, forming an excellent waterproof seal. Simultaneously, its softness allows it to deform and be drawn open even under small negative pressure, exhibiting a sensitive response. When the negative pressure disappears, it can quickly rebound and reset due to its elasticity, resealing the through-hole. If the negative pressure valve 20 uses a soft rubber component, there is no need for complex springs or mechanical structures, resulting in a simple valve body structure, low manufacturing cost, and good durability. For example, the negative pressure valve 20 is a one-piece molded soft rubber component.

[0042] In some embodiments, the vent hole 11 and the negative pressure valve 20 can be disposed on the side wall of the housing 10 or on the top of the housing 10. Exemplarily, in this embodiment, the vent hole 11 and the negative pressure valve 20 are disposed on the top of the housing 10, near the edge of the housing 10.

[0043] Please refer to the following: Figures 2 to 4 In some embodiments, the housing 10 is provided with mounting holes 12, and vent holes 11 are spaced around the mounting holes 12 with the mounting holes 12 as the center. The negative pressure valve 20 includes a valve stem 21 and a sealing cap 22. The valve stem 21 passes through the mounting holes 12 and is mounted on the housing 10. The sealing cap 22 is located inside the housing 10 and is aligned with the mounting holes 12. The sealing cap 22 is connected to one end of the valve stem 21.

[0044] Among them, at least one of the valve stem 21 and the sealing cap 22 can deform when the negative pressure inside the housing 10 reaches a preset value, or the valve stem 21 can move a preset distance relative to the housing 10 into the housing 10 when the negative pressure inside the housing 10 reaches a preset value, so that the sealing cap 22 opens the vent hole 11.

[0045] Understandably, in this embodiment, the cooperation between the valve stem 21 and the mounting hole 12 ensures that the negative pressure valve 20 is securely installed in the designated position and will not move or fall off inside the water tank 100. When negative pressure is generated, there is a negative pressure suction inside the tank 10, which causes the valve stem 21 or the sealing cap 22 to undergo elastic deformation, or the valve stem 21 to move inward as a whole, causing the sealing cap 22 to open the through hole.

[0046] In some embodiments, the mounting hole 12 is a through hole, and the valve stem 21 is provided with a flexible flange 211 in the circumferential direction. The flexible flange 211 can be squeezed through the mounting hole 12 by the inner wall of the mounting hole 12 and abut against the edge or end face of the mounting hole 12 from the outside of the housing 10.

[0047] Understandably, the valve stem 21 is provided with a flexible flange 211. During installation, this flange can be squeezed and deformed to pass through the mounting hole 12, and then return to its original shape, thereby locking the edge of the mounting hole 12 from the outside of the water tank 100, achieving a snap-fit ​​installation. With the above structure, the valve body can be installed simply by pushing or pulling, greatly improving assembly efficiency and reducing manufacturing costs. The snap-fit ​​structure effectively prevents the valve body from falling out of the water tank 100, ensuring its long-term operational reliability.

[0048] In some embodiments, the mounting hole 12 is a stepped hole, with the diameter of the hole near the outer side of the housing 10 being larger than the diameter of the hole near the inner side of the housing 10. For example, the portion of the mounting hole 12 near the outer side of the housing 10 can accommodate the flexible flange 211 and abut against the edge or end face of the portion of the mounting hole 12 near the inner side of the housing 10.

[0049] In some embodiments, the other end of the valve stem 21 is provided with a tail material 212, which is used to drive the flexible flange 211 through the mounting hole 12 from the inside of the housing 10 and is cut off after the valve stem 21 is installed in the housing 10.

[0050] Understandably, in this embodiment, a tail section 212 is added to the other end of the valve stem 21 to serve as a handle. During assembly, this tail section 212 can be pinched or clamped with a tool to easily pull the valve stem 21 with the flexible flange 211 through the mounting hole 12 from inside the water tank 100. After installation, this excess tail section is then cut off.

[0051] For example, the outer contour of the tail material 212 gradually narrows in the direction of its extension to the end, so as to facilitate alignment with the mounting hole 12 when it is inserted into the mounting hole 12.

[0052] In other embodiments, the mounting hole 12 is a countersunk hole, the valve stem 21 is a flexible member, the valve stem 21 passes through and is housed in the mounting hole 12, and is bonded to the inner wall or bottom surface of the mounting hole 12 by adhesive.

[0053] Understandably, the valve stem 21 is a flexible component, such as a silicone component, which can be stretched and deformed. The valve stem 21 can be bonded to the inner wall or bottom surface of the mounting hole 12 with adhesive. When the negative pressure reaches a preset value, the sealing cap 22 moves under the negative pressure inside the housing 10, and the valve stem 21 is stretched, thereby allowing gas from outside the housing 10 to enter the interior.

[0054] Please refer to the following: Figure 5 and Figure 6 In some embodiments, there are multiple vent holes 11, which are arranged in a ring around the center of the mounting hole 12.

[0055] Understandably, the multiple small holes arranged in a ring ensure that even if the sealing cap 22 tilts slightly when it is sucked open, some of the through holes will still be able to open, guaranteeing smooth air intake in various postures. The multi-hole design allows for more even airflow distribution while maintaining the total air intake volume. Simultaneously, the sealing cap 22 can more stably cover this ring of through holes, resulting in a better seal. Compared to a single large hole, the design of multiple small holes is more effective in preventing larger dust or debris from accidentally entering the water tank 100.

[0056] Please refer to the following: Figure 2 and Figure 6 In some embodiments, the vent hole 11 includes a first hole segment 111 and a second hole segment 112 extending sequentially in the depth direction. The first hole segment 111 is closer to the inner side of the housing 10 than the second hole segment 112, and the diameter of the first hole segment 111 is smaller than the diameter of the second hole segment 112.

[0057] Understandably, the sealing cap 22 seals the vent hole 11 inside the housing 10. Since the sealing cap 22 is in direct contact with the smaller-diameter first orifice segment 111, the required contact area for sealing is smaller and more concentrated. For the flexible sealing cap 22, forming a reliable seal on a smaller orifice is easier and more reliable than on a larger one. For example, when the water tank 100 is used in a cleaning robot, water in the tank 10 may slosh to the vent hole 11 when the robot is moved, tilted, or inverted. Because the inner first orifice segment 111 has a very small diameter, the surface tension of the water makes it easier to form a water film at the small orifice, preventing water from flowing out. Compared to a larger diameter orifice, this small-diameter design more effectively prevents leakage caused by accidental shaking. When negative pressure is generated internally and the sealing cap 22 is sucked open, external air needs to enter. The wider second orifice 112 can serve as an intake guide zone, ensuring that air can flow smoothly to the narrower first orifice 111, reducing the total resistance along the entire intake path and facilitating rapid air replenishment.

[0058] Please review Figure 6 In some embodiments, the first hole segment 111 and the second hole segment 112 are two hole segments with different axes, and the axis of the first hole segment 111 is closer to the mounting hole 12 than that of the second hole segment 112.

[0059] Understandably, because the inner first hole segment 111 is designed to be closer to the central mounting hole 12, this means that the edge of the umbrella-shaped sealing cap 22 can more stably and completely cover all the air inlet openings. Even if the sealing cap 22 is slightly misaligned during installation or operation, incomplete sealing is less likely to occur due to the inward convergence of the openings.

[0060] In some embodiments, the outer side of the housing 10 is provided with a groove connecting each ventilation hole 11 at the ventilation hole 11, and a protrusion is provided on the inner side of the corresponding housing 10 to ensure the installability of the valve stem 21.

[0061] Please review Figure 4 In some embodiments, the sealing cap 22 has an umbrella-shaped structure, and the center of the sealing cap 22 is connected to one end of the valve stem 21. When the negative pressure inside the housing 10 does not reach a preset value, the center of the sealing cap 22 is recessed in a direction away from the vent hole 11, and the edge of the sealing cap 22 abuts against the inner wall of the housing 10 to form a cavity inside the sealing cap 22 that communicates with the vent hole 11 and is isolated from the inside of the housing 10.

[0062] Understandably, the sealing cap 22 is umbrella-shaped. Its center is connected to the valve stem 21, and its wide, elastic umbrella-shaped edge normally conforms to the inner wall of the housing 10, covering the annular through-hole. When negative pressure is generated, this thin, elastic umbrella surface is easily drawn up and deformed, opening the air intake passage with a very sensitive response. When the negative pressure inside the housing 10 returns to the preset value, it recovers its deformation and re-abuts against the inner wall of the housing 10 to seal the vent hole 11.

[0063] In some embodiments, the sealing cap 22 has a thumbtack-shaped structure, and the surface of the sealing cap 22 facing the vent hole 11 is a flat end face. When the negative pressure inside the housing 10 does not reach the preset value, the surface of the sealing cap 22 facing the vent hole 11 is in contact with the end face of the vent hole 11.

[0064] Understandably, the sealing cap 22 in this embodiment is roughly tack-shaped, with a flat end face near the vent hole. When the negative pressure inside the housing 10 does not reach a preset value, the flat end face of the sealing cap 22 contacts the end face of the vent hole 11, sealing each vent hole 11 to form a sealed space inside the housing 10. When the negative pressure inside the housing 10 reaches the preset value, the sealing cap 22 deforms or moves away from the vent hole 11 to open the vent hole 11. More easily understood, the sealing cap 22 uses a flat end face to achieve surface contact with the end face of the vent hole 11, which can improve the sealing performance of the vent hole 11.

[0065] Please refer to the following: Figures 1 to 3 In a second aspect, embodiments of this application provide an electrical device including the water tank 100 and a water pump as described in the above embodiments. The water pump is connected to the water tank 100 and is used to pump liquid from the water tank 100.

[0066] For example, the electrical device can be a cleaning robot, including a robot body, a water tank 100 as described in the above embodiment, and a water pump. A mop is provided at the bottom of the robot body. The water tank 100 is provided on the robot body. The water pump is provided on the robot body and connected to the water tank 100, for pumping liquid from the water tank 100 onto the mop.

[0067] Understandably, the electrical equipment in this application embodiment uses the water tank 100 from the above embodiment. This application embodiment effectively prevents the accumulation of negative pressure within the water tank 100 by automatically replenishing air when needed, ensuring stable and low-load operation of the water pump, extending the water pump's lifespan, and ensuring uniform and stable water output. When the electrical equipment is a cleaning robot, the water pump has a good pumping effect, continuously pumping liquid from the water tank 100 to the mop to ensure effective cleaning of the floor and self-cleaning of the mop.

[0068] In some embodiments, the total instantaneous air intake of all vent holes 11 in the open state is greater than the single pumping capacity of the water pump used in conjunction with the water tank 100.

[0069] Understandably, by setting the number and / or diameter of the vent holes 11, this embodiment of the application requires that the total instantaneous air intake of all vent holes 11 in the open state must be greater than the single pumping capacity of the water pump in one working cycle. This ensures that the negative pressure caused by each pumping operation can be completely and quickly compensated within the same cycle. This prevents the gradual accumulation of negative pressure, thereby fundamentally avoiding pump overload or poor water output caused by excessive negative pressure. Even in certain special circumstances, such as when the cleaning fluid is viscous or the outlet is slightly blocked, requiring the water pump to increase its pumping frequency or force, this design ensures that the air supply is sufficiently rapid, guaranteeing the stable operation of the entire cleaning system.

[0070] In some embodiments, the negative pressure valve 20 works in conjunction with the overall cleaning robot system. For example, the water pump in the cleaning equipment typically uses pulsed water supply, generating a momentary negative pressure peak with each operation. The negative pressure valve 20 of this embodiment, due to its simple structure, light weight, and fast elastic response, can accurately follow the working rhythm of the water pump, quickly opening to replenish air after each pumping pulse and immediately rebounding to close after pressure equilibrium, effectively preventing the accumulation effect of negative pressure and ensuring that the water output remains highly stable and consistent even in intermittent water supply mode.

[0071] Considering that impurities or minerals in the water may form scale during long-term use, the negative pressure valve 20 of this invention uses a one-piece molded smooth silicone surface, which is not prone to dirt adhesion. The air intake channel formed when it is open is relatively spacious, and the airflow can play a certain self-cleaning role, reducing the risk of failure due to blockage. Furthermore, its unique snap-fit ​​installation structure makes the replacement and maintenance of the negative pressure valve 20 extremely simple. When deep cleaning or replacement is required, maintenance personnel or even users do not need complicated tools; they only need to pull the old valve out of the mounting hole 12 and then pull in the new valve body to fasten it, greatly reducing maintenance costs and difficulty.

[0072] Please see Figure 6 For example, the number of ventilation holes 11 in the housing 10 is set to 3, and they are arranged around the mounting hole 12. The diameter of the ventilation holes 11 is set to 0.8mm~2mm. The designer can select the water pump specification and adjust the single pumping capacity of the water pump according to actual needs, which is not limited here.

[0073] In a third aspect, embodiments of this application provide a cleaning system, including a cleaning robot as described in the above embodiments.

[0074] It is understood that this application embodiment applies the cleaning robot equipped with the water tank 100 of the above embodiment to the cleaning system to ensure the working stability and service life of the entire cleaning system. In some embodiments, the cleaning system includes only a single cleaning robot, and the user can manually supply water to the cleaning robot's water tank 100. In other embodiments, the cleaning system also includes a base station, where the cleaning robot can dock for charging. Optionally, the base station can also be equipped with a base station water tank 100 or a water supply component, which can supply water to the cleaning robot's water tank 100 when the cleaning robot docks at the base station.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A water tank, characterized in that, include: The tank body is provided with at least one vent hole, which is located above the preset maximum water level limit of the tank body; A negative pressure valve is disposed inside the housing. The vent holes are spaced around the center of the negative pressure valve. The projection of the negative pressure valve on the end face of the vent holes covers each of the vent holes. The negative pressure valve is used to close the vent holes when the negative pressure inside the housing does not reach a preset value, and to open the vent holes when the negative pressure inside the housing reaches the preset value, forming an air intake channel with the inner wall of the housing, allowing external air to enter the housing through the vent holes.

2. The water tank according to claim 1, characterized in that, The negative pressure valve is a soft rubber component or an elastic component.

3. The water tank according to claim 1, characterized in that, The housing is provided with mounting holes, and the vent holes are spaced around the mounting holes with the mounting holes as the center. The negative pressure valve includes: The valve stem passes through the mounting hole and is mounted on the housing; A sealing cap is located inside the housing and aligned with the mounting hole; the sealing cap is connected to one end of the valve stem. Wherein, at least one of the valve stem and the sealing cap can deform when the negative pressure inside the box reaches the preset value, or the valve stem can move a preset distance relative to the box into the box when the negative pressure inside the box reaches the preset value, so that the sealing cap opens the vent hole.

4. The water tank according to claim 3, characterized in that, The mounting hole is a through hole, and the valve stem is provided with a flexible flange in the circumferential direction. The flexible flange can be squeezed through the mounting hole by the inner wall of the mounting hole and abut against the edge or end face of the mounting hole from the outside of the housing.

5. The water tank according to claim 4, characterized in that, The other end of the valve stem is provided with a tail material, which is used to drive the flexible flange through the mounting hole from inside the housing and is cut off after the valve stem is installed in the housing.

6. The water tank according to claim 3, characterized in that, The number of the ventilation holes is multiple, and the multiple ventilation holes are arranged in a ring around the center of the mounting hole.

7. The water tank according to claim 3, characterized in that, The sealing cap has an umbrella-shaped structure, and the center of the sealing cap is connected to one end of the valve stem; When the negative pressure inside the box does not reach the preset value, the center of the sealing cap is recessed in a direction away from the vent hole, and the edge of the sealing cap abuts against the inner wall of the box to form a cavity inside the sealing cap that connects to the vent hole and is isolated from the inside of the box.

8. The water tank according to claim 3, characterized in that, The sealing cap has a thumbtack-shaped structure, and the side of the sealing cap facing the vent hole is a flat end face; When the negative pressure inside the box does not reach the preset value, the surface of the sealing cap facing the vent hole contacts the end face of the vent hole.

9. An electrical appliance, characterized in that, include: The water tank as described in any one of claims 1-8; A water pump, connected to the water tank, is used to pump liquid from the water tank.

10. The electrical equipment according to claim 9, characterized in that, The total instantaneous air intake of all the vent holes when they are open is greater than the single pumping capacity of the water pump.

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