Water tank structure and cooling fan

Abstract

The utility model relates to a water tank structure and a cooling fan. The main body water tank is arranged on the auxiliary box body, and the water supply assembly is communicated with the main body water tank; the water conveying assembly is configured to convey liquid in the auxiliary box body to the main body water tank. Thus, the water tank structure is divided into the main water tank and the auxiliary tank body, the auxiliary tank body is small in size, a user can conveniently clean all areas in the auxiliary water tank and clean the auxiliary water tank, and therefore the cleanliness of water in the auxiliary water tank can be improved, the cleanliness of water in the main water tank and the cleanliness of outlet air can be improved, and the service life of the water tank is prolonged. And the influence on the user health is prevented. Meanwhile, as the liquid in the main body water tank is fed from the auxiliary water tank, a user mainly cleans the auxiliary water tank located at the source of the liquid, the air outlet cleanliness of the cooling fan can be guaranteed without cleaning the main body with a large size, and cleaning is more convenient.

Description

Technical Field

[0001] This application relates to the field of air cooler technology, and in particular to water tank structure and air cooler. Background Technology

[0002] As a new type of cooling method between fans and air conditioners, air coolers are becoming increasingly popular among consumers. Their working principle is that a water pump draws water into the evaporation component to evaporate it, and then the water mist formed by evaporation is mixed with air and sent out through the air outlet, blowing out cold air at the air outlet.

[0003] Generally, the water tank in a fan evaporator is quite deep, which makes it difficult for users to disassemble and clean it thoroughly. This can affect the water quality and the cleanliness of the airflow. Long-term use of a water tank that has not been properly cleaned may lead to bacterial growth and poor airflow, posing a potential threat to the user's health. Utility Model Content

[0004] Therefore, it is necessary to provide a water tank structure and a cooling fan to address the problem of poor air cleanliness in traditional air coolers.

[0005] A water tank structure, characterized in that it comprises:

[0006] Main water tank;

[0007] An auxiliary tank and a water delivery assembly, wherein the main water tank is mounted on the auxiliary tank and the water delivery assembly is connected to the main water tank;

[0008] The water delivery assembly is configured to transport the liquid in the auxiliary tank to the main water tank.

[0009] In the aforementioned water tank structure, water in the auxiliary tank is transported to the main water tank via a water delivery assembly. The water in the main tank evaporates to form cool air, enabling the evaporator to blow cool air. Furthermore, by dividing the water tank structure into the main tank and the auxiliary tank, and with the auxiliary tank being smaller, users can easily clean all areas within it. This improved water cleanliness in the auxiliary tank, consequently enhancing the cleanliness of the water in the main tank and the cleanliness of the exhaust air, preventing any adverse health effects on the user. Simultaneously, since the liquid in the main tank is supplied by the auxiliary tank, users only need to clean the auxiliary tank, located at the liquid source, without needing to clean the larger main tank, thus ensuring the cleanliness of the evaporator's exhaust air and making cleaning more convenient.

[0010] In some embodiments, the water delivery assembly is located within the auxiliary tank and is configured to filter the liquid within the auxiliary tank and then deliver it to the main water tank.

[0011] In some embodiments, the water delivery assembly includes a filter and a water pump. The filter is disposed in the auxiliary housing and divides the internal space of the auxiliary housing into a first cavity and a second cavity. The first cavity can be selectively closed and opened, and the water pump is disposed in the second cavity. The water pump is used to deliver the liquid filtered by the filter to the main water tank.

[0012] In some embodiments, the filter element is annular and self-encloses to form the second cavity, and along the radial direction of the filter element, the filter element and the auxiliary housing enclose to form a first cavity surrounding the second cavity.

[0013] In some embodiments, the filter element includes a housing and a filter section. The housing is annularly disposed within the auxiliary housing and encloses to form a second cavity. The housing and the auxiliary housing enclose to form a first cavity along the radial direction of the housing. The filter section is disposed on the housing and located between the first cavity and the second cavity to perform liquid filtration.

[0014] In some embodiments, the housing includes a circumferentially closed annular portion and a bottom disposed at one axial end of the annular portion, the bottom and the annular portion enclosing each other to form the second cavity, and the filter portion is disposed on the bottom;

[0015] Along the axial direction of the housing, a liquid passage gap is defined between the bottom and the auxiliary housing, and the liquid passage gap connects the first cavity and the filter section.

[0016] In some embodiments, the filter element further includes a plurality of support portions, which are spaced apart from each other on the side of the bottom facing away from the second cavity, and the plurality of support portions are supported on the bottom wall of the auxiliary housing, and the liquid passage gap is formed between the bottom and the bottom wall of the auxiliary housing supported by the plurality of support portions.

[0017] In some embodiments, the housing includes a circumferentially closed annular portion on which the filter portion is disposed; the filter portion is located between the first cavity and the second cavity along the radial direction of the housing.

[0018] In some embodiments, the auxiliary housing includes a housing body and a cover, the filter element is disposed in the housing body, and the filter element and the housing body enclose each other to form the first cavity along the radial direction of the filter element. An opening is opened on the housing body corresponding to the first cavity, and the cover is closably disposed at the opening.

[0019] In some embodiments, along the radial direction of the filter element, both opposite ends of the cover are detachably fastened to the housing body; or

[0020] The opening extends to the main water tank. Along the radial direction of the filter element, one end of the cover is detachably fastened to the tank body, and the other end of the cover is detachably fastened to the main water tank.

[0021] A cooling fan, comprising the aforementioned water tank structure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the cooling fan in some embodiments of this application;

[0023] Figure 2 The following are schematic diagrams of the water tank structure in some embodiments of this application;

[0024] Figure 3 This is a partially enlarged schematic diagram of the water tank structure in some embodiments of this application;

[0025] Figure 4 This is a schematic diagram of the structure of the filter element in some embodiments of this application.

[0026] Explanation of reference numerals in the attached drawings: 100, water tank structure; 10, main water tank; 30, auxiliary water tank; 32, auxiliary tank body; 321, tank body; 323, cover; 324, buckle; 325, fastener; 33, first cavity; 34, water delivery assembly; 35, filter element; 351, shell; 353, filter section; 355, annular section; 357, bottom; 36, second cavity; 37, support section; 38, water pump; 50, liquid passage gap; 200, cooling fan; 210, cooling fan head; 230, cooling fan body. Detailed Implementation

[0027] 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.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0029] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] 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 according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through 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. "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.

[0032] It should be noted that when 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. When 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] See Figure 1 According to some embodiments of this application, this application provides a cooling fan 200, including a cooling fan head 200 and a cooling fan body 230. The cooling fan head 200 is disposed on the cooling fan body 230 and is used to blow air to the outside. Specifically, the cooling fan head 200 includes an evaporator and an air outlet assembly. The cooling fan body 230 includes a water tank structure 100, which is used to supply water to the evaporator. The evaporator evaporates and atomizes the introduced water to form mist. The air outlet assembly mixes the evaporated water mist with air and sends it out to provide cool air to the user.

[0034] See Figures 2-4 According to some embodiments of this application, the water tank structure 100 includes a main water tank 10, an auxiliary tank 32, and a water delivery assembly 34. The main water tank 10 is disposed on the auxiliary tank 32, and the water delivery assembly 34 is connected to the main water tank 10. The water delivery assembly 34 is used to transport the liquid in the auxiliary tank 32 to the main water tank 10. That is, the water in the auxiliary tank 32 is transported to the main water tank 10 through the water delivery assembly 34, and the water in the main water tank 10 is used to evaporate and form cold air, thereby achieving the function of the evaporative cooling fan blowing cold air.

[0035] Furthermore, the water tank structure 100 is divided into a main water tank 10 and an auxiliary tank 32. The auxiliary tank 32 is smaller, allowing users to easily clean all areas within it. This improves the cleanliness of the water in the auxiliary tank 30, which in turn improves the cleanliness of the water in the main water tank 10 and the cleanliness of the exhaust air, preventing any impact on user health. Simultaneously, since the liquid in the main water tank 10 is supplied by the auxiliary water tank 32, users only need to clean the auxiliary water tank 32, located at the liquid source, without needing to clean the larger main water tank 10. This ensures the cleanliness of the exhaust air from the air cooler 200, making cleaning more convenient.

[0036] Furthermore, the water delivery component 34 is located inside the auxiliary housing 32. The water delivery component 34 is configured to filter the liquid in the auxiliary housing 32 and then deliver it to the main water tank 10. In this way, by first filtering and cleaning the liquid in the auxiliary housing 32 through the water delivery component 34, and then delivering it to the main water tank 10, the water in the main water tank 10 can be kept in a clean state. Then, the water in the main water tank 10 evaporates to form cold air, further ensuring the cleanliness of the air output of the air cooler 200 and preventing any impact on the user's health.

[0037] According to some embodiments of this application, the water delivery assembly 34 includes a filter element 35 and a water pump 38. The filter element 35 is disposed inside the auxiliary housing 32, dividing the internal space of the auxiliary housing 32 into a first cavity 33 and a second cavity 36. The first cavity 33 can be optionally closed and opened. The water pump 38 is disposed inside the second cavity 36. The water pump 38 is used to deliver the liquid filtered by the filter element 35 to the main water tank 10. In this way, during use, the first cavity 33 can be opened to add water to the auxiliary housing 32, and when the water pump 38 is working, it can deliver the water filtered by the filter element 35 in the second cavity 36 to the main water tank 10, injecting clean water into the main water tank 10 and ensuring the cleanliness of the water in the main water tank 10.

[0038] According to some embodiments of this application, the filter element 35 is annular and self-encloses to form a second cavity 36. Along the radial direction of the filter element 35, the filter element 35 and the auxiliary housing 32 enclose to form a first cavity 33 surrounding the second cavity 36. That is, the filter element 35 is configured as a circumferentially closed structure, so that the filter element 35 self-encloses to form the second cavity 36. In addition, after the filter element 35 is placed inside the auxiliary housing 32, the filter element 35 and the auxiliary housing 32 have a distance in the radial direction of the filter element 35, which defines the first cavity 33. Thus, the first cavity 33 surrounds the outer periphery of the second cavity 36, and the first cavity 33 can be easily opened and closed, facilitating the addition of water to the auxiliary housing 32 and the cleaning of the auxiliary water tank 30. At the same time, a water pump 38 is placed in the central second cavity 36, which can transport the filtered water to the main water tank 10.

[0039] Furthermore, after the first chamber 33 is opened and water is added, the added water flows from the first chamber 33 through the filter element 35 to the second chamber 36 located in the center. Thus, the filter element 35 is positioned in the water flow path within the auxiliary chamber 32 to filter impurities. Additionally, when the water pump 38 operates, while the water in the second chamber 36 is pumped away, the water in the first chamber 33, after passing through the filter element 35, is replenished into the second chamber 36, thereby also filtering impurities from the liquid through the filter element 35.

[0040] Optionally, the filter element 35 is in the shape of a circular ring or a polygonal ring, and the filter element 35 is capable of filtering impurities in the water.

[0041] Furthermore, the filter element 35 includes a housing 351 and a filter section 353. The housing 351 is annularly disposed within the auxiliary housing 32, and the housing 351 encloses to form a second cavity 36. A first cavity 33 is formed between the housing 351 and the auxiliary housing 32 along the radial direction of the housing 351. The filter section 353 is disposed on the housing 351 and is located between the first cavity 33 and the second cavity 36 for liquid filtration. The filter section 353 has a filtration function and can filter liquids. The housing 351 is provided with the filter section 353, serving as the mounting base or forming base for the filter section 353, and is constructed as a circumferentially closed filter element 35 to facilitate the division of the first cavity 33 and the second cavity 36.

[0042] Optionally, the filter section 353 is configured to include a first filter section 353, which consists of multiple filter holes formed on the housing 351. The liquid entering the second chamber 36 from the first chamber 33 is filtered through these multiple filter holes to improve cleanliness. Alternatively, the filter section 353 is configured to include a second filter section 353, which is a filter membrane or filter cotton. The liquid is then finely filtered through the filter membrane or filter cotton. Alternatively, the filter section 353 is configured to include both a first filter section 353 and a second filter section 353. Specifically, multiple filter holes are formed on the housing 351 to form the first filter section 353, and a second filter section 353 is disposed on at least one side of the multiple filter holes along the axial direction. In this way, the liquid undergoes multiple filtrations through the filter holes and the filter membrane or filter cotton in the second filter section 353, resulting in a better filtration effect.

[0043] According to some embodiments of this application, the housing 351 includes a circumferentially closed annular portion 355 and a bottom 357 disposed at one axial end of the annular portion 355. The bottom 357 and the annular portion 355 enclose a second cavity 36. A filter portion 353 is disposed on the bottom 357. Along the axial direction of the housing 351, a liquid-passing gap 50 is defined between the bottom 357 and the auxiliary housing 32, and the liquid-passing gap 50 connects the first cavity 33 and the filter portion 353. In this way, the filter portion 353 is disposed on the bottom 357 of the housing 351, and a filter gap is formed between the bottom 357 of the housing 351 and the bottom wall of the auxiliary housing 32. Thus, the liquid in the first cavity 33 flows through the liquid-passing gap 50 and then through the filter portion 353 to the second cavity 36. In this way, the liquid can be filtered by the filter portion 353. At the same time, when the amount of water in the auxiliary housing 32 is very small, it can still flow to the filter portion 353 and the second cavity 36, thereby improving the utilization rate of water in the auxiliary housing 32.

[0044] Furthermore, the filter element 35 also includes a plurality of support portions 37, which are spaced apart from each other on the side of the bottom 357 facing away from the second cavity 36. The support portions 37 are supported on the bottom wall of the auxiliary housing 32, forming a liquid-passing gap 50 between the bottom 357 and the bottom wall of the auxiliary housing 32. Thus, to form the liquid-passing gap 50, a plurality of support portions 37 are spaced apart on the bottom 357 of the filter element 35 to support the bottom 357, defining the liquid-passing gap 50 between the bottom 357 and the bottom wall of the auxiliary housing 32. Simultaneously, the spaced-apart support portions 37 allow communication between the first cavity 33 and the liquid-passing gap 50 through the gaps between adjacent support portions 37, allowing liquid in the first cavity 33 to flow to the liquid-passing gap 50.

[0045] Optionally, the plurality of support portions 37 are spaced apart from each other along the circumference of the annular portion 355; alternatively, the plurality of support portions 37 are arranged irregularly, which is not limited.

[0046] According to some embodiments of this application, the housing 351 includes a circumferentially closed annular portion 355, on which a filter portion 353 is provided; along the radial direction of the housing 351, the filter portion 353 is located between the first cavity 33 and the second cavity 36, and the liquid in the first cavity 33 flows radially to the filter portion 353 and then enters the second cavity 36, and the filter portion 353 is used to filter the liquid flowing to the second cavity 36 to improve the cleanliness of the liquid.

[0047] According to some embodiments of this application, the housing 351 includes a circumferentially closed annular portion 355 and a bottom 357 disposed at one axial end of the annular portion 355. The bottom 357 and the annular portion 355 enclose a second cavity 36. A filter portion 353 is provided on both the annular portion 355 and the bottom 357. Along the axial direction of the housing 351, a liquid-passing gap 50 is defined between the bottom 357 and the auxiliary housing 32, and the liquid-passing gap 50 connects the first cavity 33 and the filter portion 353. In this way, the filter portion 353 is provided on the bottom 357 of the housing 351, and a filter gap is formed between the bottom 357 of the housing 351 and the bottom wall of the auxiliary housing 32. Liquid in the first cavity 33 can flow into the second cavity 36 through the filter portion 353 after passing through the liquid-passing gap 50. Furthermore, a filter section 353 is also provided on the annular portion 355. The filter section 353 on the annular portion 355 is located between the first cavity 33 and the second cavity 36. Liquid in the first cavity 33 can also flow radially to the filter section 353 and then enter the second cavity 36. In this way, both the bottom 357 and the filter section 353 on the annular portion 355 can filter the liquid flowing to the second cavity 36, improving the cleanliness of the liquid.

[0048] Furthermore, when the water level in the auxiliary chamber is low, water can flow through the liquid passage 50 above the bottom wall of the auxiliary chamber 32 to the filter section 353 and the second chamber 36, thereby improving the utilization rate of water in the auxiliary chamber 32.

[0049] Furthermore, the filter element 35 also includes a plurality of support portions 37, which are spaced apart from each other on the side of the bottom 357 facing away from the second cavity 36. The support portions 37 are supported on the bottom wall of the auxiliary housing 32, forming a liquid-passing gap 50 between the bottom 357 and the bottom wall of the auxiliary housing 32. Thus, to form the liquid-passing gap 50, a plurality of support portions 37 are spaced apart on the bottom 357 of the filter element 35 to support the bottom 357, defining the liquid-passing gap 50 between the bottom 357 and the bottom wall of the auxiliary housing 32. Simultaneously, the spaced-apart support portions 37 allow communication between the first cavity 33 and the liquid-passing gap 50 through the gaps between adjacent support portions 37, allowing liquid in the first cavity 33 to flow to the liquid-passing gap 50.

[0050] Optionally, the plurality of support portions 37 are spaced apart from each other along the circumference of the annular portion 355; alternatively, the plurality of support portions 37 are arranged irregularly, which is not limited.

[0051] According to some embodiments of this application, the auxiliary tank 32 includes a tank body 321 and a cover 323. A filter element 35 is disposed inside the tank body 321, and a first cavity 33 is formed between the filter element 35 and the tank body 321 along the radial direction of the filter element 35. An opening is provided on the tank body 321 corresponding to the first cavity 33, and the cover 323 is closable and can be opened and closed to cover the opening. In this way, an opening communicating with the first cavity 33 is provided on the tank body 321, and the opening can be closed and opened by the cover 323, so that users can add water to the auxiliary water tank 30 through the opening, and also allow users to open the opening to clean the inside of the auxiliary water tank 30, thereby improving the cleanliness of the inside of the auxiliary water tank 30 and preventing the growth of bacteria inside the auxiliary water tank 30.

[0052] Specifically, the housing body 321 includes a bottom wall, a top wall, and an outer peripheral wall connecting the top wall and the bottom wall. A filter element 35 is disposed between the top wall and the bottom wall, and has a gap with the outer peripheral wall. The filter element 35 and the outer peripheral wall define a first cavity 33. Furthermore, an opening is provided on the top wall, and a cover 323 is detachably installed over the opening and connected to the top wall to open and close the opening. The opening on the top wall also facilitates user operations such as adding water and cleaning.

[0053] Optionally, along the radial direction of the filter element 35, both opposite ends of the cover 323 are detachably fastened to the tank body 321. This allows the cover 323 to close and open the opening by engaging its radially opposite ends with the tank body 321. Alternatively, the opening extends to the main water tank 10. Along the radial direction of the filter element 35, one end of the cover 323 is detachably fastened to the tank body 321, and the other end is detachably fastened to the main water tank 10. Thus, when the opening is large and extends directly to the main water tank 10, one end of the cover 323 is adjacent to the main water tank 10, and one end can be detachably fastened to the main water tank 10, while the other end is detachably fastened to the tank body 321, allowing for detachable assembly of the cover 323.

[0054] Furthermore, a buckle 324 is provided on the bottom wall of the cover 323 facing the first cavity 33, a fastener 325 is provided on the inner wall of one end of the tank body 321, and another fastener 325 is provided on the other end of the tank body 321 or on the main water tank 10. In this way, the cover 323 is installed by the cooperation of the buckle 324 and the fastener 325.

[0055] Alternatively, in other embodiments, the cover 323 may also be rotatably mounted on the tank body 321 or the water tank body.

[0056] According to some embodiments of this application, this application also provides a water tank structure 100 as described in any of the above embodiments. The water tank structure 100 includes a main water tank 10, an auxiliary tank 32, and a water delivery assembly 34. The main water tank 10 is disposed on the auxiliary tank 32, and the water delivery assembly 34 is connected to the main water tank 10. The water delivery assembly 34 is used to deliver liquid from the auxiliary tank 32 to the main water tank 10. That is, water in the auxiliary tank 32 is delivered to the main water tank 10 via the water delivery assembly 34, and the water in the main water tank 10 is used for evaporation to form cold air, thus realizing the function of the evaporative air cooler. Furthermore, by decomposing the water tank structure 100 into the main water tank 10 and the auxiliary tank 32, and considering the smaller size of the auxiliary tank 32, users can easily clean various areas within the auxiliary water tank 30, thus improving the cleanliness of the water in the auxiliary water tank 30, thereby improving the cleanliness of the water in the main water tank 10 and the cleanliness of the exhaust air, preventing any impact on user health.

[0057] Furthermore, the water delivery component 34 is located inside the auxiliary housing 32. The water delivery component 34 is configured to filter the liquid in the auxiliary housing 32 and then deliver it to the main water tank 10. In this way, by first filtering and cleaning the liquid in the auxiliary housing 32 through the water delivery component 34, and then delivering it to the main water tank 10, the water in the main water tank 10 can be kept in a clean state. Then, the water in the main water tank 10 evaporates to form cold air, further ensuring the cleanliness of the air output of the air cooler 200 and preventing any impact on the user's health.

[0058] 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.

[0059] 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 water tank structure, characterized in that, include: Main water tank; An auxiliary tank and a water delivery assembly, wherein the main water tank is mounted on the auxiliary tank and the water delivery assembly is connected to the main water tank; The water delivery assembly is used to transport the liquid in the auxiliary tank to the main water tank.

2. The water tank structure according to claim 1, characterized in that, The water delivery assembly is located inside the auxiliary tank and is configured to filter the liquid inside the auxiliary tank and then deliver it to the main water tank.

3. The water tank structure according to claim 1, characterized in that, The water delivery assembly includes a filter element and a water pump. The filter element is located inside the auxiliary housing and divides the internal space of the auxiliary housing into a first cavity and a second cavity. The first cavity can be selectively closed and opened. The water pump is located in the second cavity and is used to deliver the liquid filtered by the filter element to the main water tank.

4. The water tank structure according to claim 3, characterized in that, The filter element is annular and encloses itself to form the second cavity. Along the radial direction of the filter element, the filter element and the auxiliary housing enclose each other to form a first cavity surrounding the second cavity.

5. The water tank structure according to claim 4, characterized in that, The filter element includes a housing and a filter section. The housing is annularly disposed within the auxiliary housing and encloses the second cavity. The housing and the auxiliary housing enclose the first cavity along the radial direction of the housing. The filter section is disposed on the housing and located between the first cavity and the second cavity to perform liquid filtration.

6. The water tank structure according to claim 5, characterized in that, The housing includes a circumferentially closed annular portion and a bottom disposed at one axial end of the annular portion. The bottom and the annular portion enclose the second cavity, and the filter portion is disposed on the bottom. Along the axial direction of the housing, a liquid passage gap is defined between the bottom and the auxiliary housing, and the liquid passage gap connects the first cavity and the filter section.

7. The water tank structure according to claim 6, characterized in that, The filter element also includes a plurality of support portions, which are spaced apart from each other on the side of the bottom facing away from the second cavity, and the plurality of support portions are supported on the bottom wall of the auxiliary housing. The liquid passage gap is formed between the bottom and the bottom wall of the auxiliary housing, supported by the plurality of support portions.

8. The water tank structure according to claim 5 or 6, characterized in that, The housing includes a circumferentially closed annular portion, on which the filter portion is disposed; the filter portion is located between the first cavity and the second cavity along the radial direction of the housing.

9. The water tank structure according to claim 4, characterized in that, The auxiliary housing includes a housing body and a cover. The filter element is disposed in the housing body. The filter element and the housing body enclose each other to form the first cavity along the radial direction of the filter element. An opening is opened on the housing body corresponding to the first cavity. The cover is closable and disposed at the opening.

10. The water tank structure according to claim 9, characterized in that, Along the radial direction of the filter element, both opposite ends of the cover are detachably fastened to the housing body; or The opening extends to the main water tank. Along the radial direction of the filter element, one end of the cover is detachably fastened to the tank body, and the other end of the cover is detachably fastened to the main water tank.

11. A cooling fan, characterized in that, The water tank structure includes any one of claims 1-10 above.

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