Anti-blocking filter device for water tank, water tank and evaporative cooling unit

Abstract

The utility model provides a kind of for water tank's anti-blocking filter device, water tank and evaporative cooling unit, wherein anti-blocking filter device includes filter screen main body and impurity cleaning assembly, filter screen main body is located inside water tank, and is connected with the water outlet of water tank by connecting pipe and intercommunication;Impurity cleaning assembly includes the cleaning component in filter screen main body inside, the driving component located outside water tank, and the transmission component connecting cleaning component and driving component, cleaning component rotates under the drive of driving component, to remove the impurity attached on filter screen main body;The anti-blocking filter device proposed in the utility model contains impurity cleaning assembly, can automatically remove the impurity attached on filter screen main body, prevent jam, ensure the reliability of inlet water, avoid shutdown, and reduce the frequency of periodic maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration equipment technology, and more specifically, it relates to an anti-clogging filter device for a water tank, a water tank, and an evaporative cooling unit. Background Technology

[0002] In recent years, my country's rail transit industry has experienced rapid development. In the rail transit environment, evaporative chillers, as a type of HVAC equipment, are highly compatible with the subway environment due to their advantages such as high energy efficiency, integrated hydraulic modules, convenient installation, no need for cooling towers, and small footprint. The evaporative heat exchanger is the core component of this unit, achieving evaporative cooling through a combination of air and water cooling. However, because evaporative chillers typically use open water tank systems, the influence of water quality and the operating environment can lead to long-term accumulation of impurities on the outside of the filter box inside the tank, causing scaling and clogging problems. This not only frequently triggers automatic or manual drainage operations, wasting water resources and increasing maintenance manpower, but may also cause more serious problems, such as sprinkler system failure and water pump damage, ultimately leading to the shutdown of the entire unit and affecting normal production. Utility Model Content

[0003] The purpose of this invention is to provide an anti-clogging filter device for water tanks, a water tank, and an evaporative cooling unit, so as to solve the problem that the filter structure inside the water tank is prone to clogging and requires frequent maintenance in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] This utility model proposes an anti-clogging filter device for water tanks, comprising:

[0006] The filter screen body is located inside the water tank and is connected to the water outlet of the water tank via a connecting pipe;

[0007] An impurity cleaning assembly includes a cleaning component located inside the filter body, a driving component located outside the water tank, and a transmission component connecting the cleaning component and the driving component. The cleaning component rotates under the drive of the driving component to remove impurities attached to the filter body.

[0008] Furthermore, the filter body includes an outer cylindrical filter, an end cap filter, and a rotating cover that together form a filter chamber. The end cap filter is installed on the connecting pipe, and the rotating cover is installed on the transmission component, with a rotation gap between it and the outer cylindrical filter.

[0009] Furthermore, the filter body also includes an inner cylinder filter screen, which is installed on the end cap filter screen. A first sub-filter chamber is formed inside the inner cylinder filter screen and communicates with the connecting pipe. A second sub-filter chamber is formed between the inner cylinder filter screen and the outer cylinder filter screen. The cleaning component is rotatably disposed in the second sub-filter chamber.

[0010] Furthermore, the cleaning component includes an impurity collection filter and a brush, the impurity collection filter being mounted on the transmission component, and the brush being disposed on a portion of the filter wall of the impurity collection filter.

[0011] Furthermore, the impurity collection filter is a spiral filter.

[0012] Furthermore, the filter hole diameters of the outer cylinder filter and the end cap filter are both set to 5 mm, the filter hole diameter of the impurity collection filter is set to 3-4 mm, and the filter hole diameter of the inner cylinder filter is set to 1-2 mm.

[0013] Furthermore, the transmission component includes a coupling and a connecting rod, the connecting rod being connected to the impurity collection filter, and the coupling connecting the connecting rod to the drive shaft of the drive component.

[0014] Furthermore, the drive shaft of the drive component is sealed to the sealing cover plate, which is installed on the tank body of the water tank.

[0015] This utility model also proposes a water tank, including a tank body and an anti-clogging filter device for the water tank as described above, installed on the tank body.

[0016] This utility model also proposes an evaporative cooling unit, including the water tank as described above.

[0017] Compared with the prior art, the advantages of the anti-clogging filter device for water tank, water tank and evaporative cooling unit provided by this utility model are as follows: The anti-clogging filter device proposed by this utility model includes an impurity cleaning component, which can automatically remove impurities attached to the filter screen body, prevent clogging, ensure the reliability of water intake, avoid downtime, and reduce the frequency of regular maintenance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1A three-dimensional schematic diagram of a water tank equipped with an anti-clogging filter device, provided for a preferred embodiment of this utility model. Figure 1 ;

[0020] Figure 2 A three-dimensional schematic diagram of a water tank equipped with an anti-clogging filter device, provided for a preferred embodiment of this utility model. Figure 2 ;

[0021] Figure 3 A top view of a water tank equipped with an anti-clogging filter device, provided for a preferred embodiment of this utility model;

[0022] Figure 4 A perspective view of the anti-clogging filter device provided in a preferred embodiment of this utility model;

[0023] Figure 5 A cross-sectional view of the anti-clogging filter device provided in a preferred embodiment of this utility model;

[0024] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0025] Figure 7 A partial perspective view of the anti-clogging filter device provided in a preferred embodiment of this utility model;

[0026] Figure 8 A partial top view of the anti-clogging filter device provided in a preferred embodiment of this utility model;

[0027] The main markings in the attached figures are as follows:

[0028] 1. Water tank;

[0029] 2. Anti-clogging filter device; 21. Filter screen body; 22. Impurity cleaning assembly; 23. Connecting pipe; 24. Flange;

[0030] 211. Outer cylinder filter screen; 212. End cap filter screen; 213. Rotating cap; 214. Inner cylinder filter screen;

[0031] 221. Cleaning component; 222. Drive component; 223. Transmission component; 224. Sealing cover;

[0032] 2211, Impurity collection filter screen; 2212, Brush; 2231, Coupling; 2232, Connecting rod; 2241, Cover plate; 2242, Sealing gasket. Detailed Implementation

[0033] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] In recent years, my country's rail transit has developed rapidly. Evaporative chillers, with their high energy efficiency, integrated hydraulic modules for easy installation, and small footprint (no cooling tower required), are highly suitable for the HVAC environment of subway tracks. The evaporative heat exchanger is the core component of this unit, achieving evaporative cooling through a combination of air and water cooling. However, because evaporative chillers typically use open-tank systems, water quality and the operating environment can cause impurities to accumulate on the outside of the filter boxes within the tank, leading to scaling and clogging. This not only frequently triggers automatic or manual drainage operations, wasting water resources and increasing maintenance manpower, but can also cause more serious problems such as sprinkler system failure and water pump damage, ultimately leading to unit shutdown and disrupting normal production.

[0035] Specifically, the water tanks used in existing evaporative chiller units have the following main problems: Due to the small pore size of the filter screen in the tank, clogging is easy to occur. Therefore, in situations with poor water quality or environment, the water tank of the evaporative chiller unit needs frequent manual or automatic cleaning. Otherwise, clogging can easily lead to frequent equipment shutdowns, thus affecting production efficiency.

[0036] To address the aforementioned problems, this utility model proposes an anti-clogging filter device for water tanks, a water tank, and an evaporative chiller unit. This anti-clogging filter device is specifically designed for open water tanks and features an automatic cleaning function for the tank's filter screen. Even under conditions of poor water quality and untimely maintenance, this device ensures continuous and stable operation of the unit, effectively preventing downtime accidents. This design not only expands the operating boundary conditions of the equipment but also reduces the frequency of regular maintenance. By reducing equipment energy consumption and the workload of maintenance personnel, it helps enterprises improve production efficiency.

[0037] Please refer to the following: Figures 1 to 5 This utility model proposes an anti-clogging filter device 2 for a water tank 1, comprising:

[0038] The filter body 21 is located inside the water tank 1 and is connected to the water outlet of the water tank 1 through the connecting pipe 23.

[0039] The impurity cleaning assembly 22 includes a cleaning component 221 located inside the filter body 21, a drive component 222 located outside the water tank 1, and a transmission component 223 connecting the cleaning component 221 and the drive component 222. The cleaning component 221 rotates under the drive of the drive component 222 to remove impurities attached to the filter body 21.

[0040] In practical applications, water in water tank 1 continuously flows through filter screen body 21, and impurities in the water gradually accumulate on filter screen body 21. When impurities accumulate to a certain extent, they may obstruct the flow of water, thus affecting the normal operation of the evaporative chiller. At this time, the impurity cleaning component 22 starts working. The drive component 222 starts, driving the cleaning component 221 to rotate inside the filter screen body 21 through the transmission component 223. During the rotation, the cleaning component 221 can effectively remove the impurities attached to the filter screen, ensuring that the filter screen body 21 is unobstructed. In this way, water can continuously and stably flow through the filter screen body 21 and be discharged from the outlet of water tank 1 through the connecting pipe 23, thereby ensuring the continuous and stable operation of the unit. Therefore, the anti-clogging filter device 2 proposed in this utility model can automatically remove impurities attached to the filter screen body 21, prevent clogging, ensure the reliability of water intake, avoid downtime, and reduce the frequency of regular maintenance.

[0041] In a further preferred embodiment of this utility model, such as Figures 4 to 6 As shown, the filter body 21 includes an outer cylindrical filter 211, an end cap filter 212, and a rotating cover 213 that together form a filter chamber. The end cap filter 212 is installed on the connecting pipe 23, and the rotating cover 213 is installed on the transmission component 223, with a rotation gap between it and the outer cylindrical filter 211.

[0042] This design uses the outer cylinder filter screen 211 and the end cap filter screen 212 as the main filtration structure. Their surfaces are covered with densely packed filter pores to intercept impurities in the water, ensuring that the water undergoes sufficient filtration before entering the connecting pipe 23. The rotating cover 213 rotates synchronously with the transmission component 223, and the rotational gap between it and the outer cylinder filter screen 211 ensures that the cleaning component 221 and the rotating cover 213 are not obstructed during rotation. This design ensures that the cleaning component 221 rotates within the filtration chamber, effectively removing impurities adhering to the filter screen body 21 without damaging it.

[0043] In practical applications, the end cap filter 212 can be welded to the outer cylinder filter 211 and installed on the connecting pipe 23. The rotating cover 213 adopts a circular design, with a small rotation gap reserved between it and the outer cylinder filter 211 to ensure that the rotating cover 213 rotates synchronously with the connecting parts. This design not only realizes the relative rotational movement of the rotating cover 213 relative to the outer cylinder filter 211, but also effectively blocks external impurities from entering the filtration chamber. In addition, both the outer cylinder filter 211 and the end cap filter 212 are coarse filters, and their filter hole diameters can be designed to be relatively large. The specific dimensions can be set according to the impurity filtration requirements during water pump operation. For example, when the water pump in the evaporative chiller is a clean water pump, the filter hole diameter of the outer cylinder filter 211 and the end cap filter 212 can be set to 5 mm.

[0044] In a further preferred embodiment of this utility model, such as Figure 7 As shown, the filter body 21 also includes an inner cylinder filter 214, which is installed on the end cap filter 212. The inner cylinder filter 214 forms a first sub-filter chamber that communicates with the connecting pipe 23. A second sub-filter chamber is formed between the inner cylinder filter 214 and the outer cylinder filter 211. The cleaning component 221 is rotatably disposed in the second sub-filter chamber.

[0045] This design also includes an additional inner cylinder filter screen 214 to further enhance the filtration effect. Its first sub-filtration chamber is connected to the connecting pipe 23, ensuring that water undergoes at least two filtration stages before entering the connecting pipe 23 for transport. The second sub-filtration chamber serves as the working area for the cleaning component 221, which rotates here to effectively remove impurities adhering to the inner cylinder filter screen 214 and the outer cylinder filter screen 211. The coordinated design between the inner cylinder filter screen 214, the end cap filter screen 212, and the outer cylinder filter screen 211 not only achieves multi-stage filtration but also ensures that the cleaning component 221 does not damage the filter body 21 during rotation. This design allows the entire filtration device to maintain high-efficiency filtration performance while also possessing good durability and stability.

[0046] In practical applications, the inner cylinder filter screen 214 can be welded to the end cap filter screen 212 as a single unit, or it can be detachably connected to the end cap filter screen 212 using fasteners. Furthermore, the inner cylinder filter screen 214 is cantilevered and fixed to the end cap filter screen 212. The filter hole diameter of the inner cylinder filter screen 214 can be set according to the spray hole diameter of the spray water system in the evaporative chiller. Generally, the smaller the filter hole diameter of the inner cylinder filter screen 214, the better the filtration effect; a range of 1-2 mm is recommended.

[0047] In a further preferred embodiment of this utility model, such as Figure 7 , Figure 8 As shown, the cleaning component 221 includes an impurity collection filter 2211 and a brush 2212. The impurity collection filter 2211 is mounted on the transmission component 223, and the brush 2212 is disposed on a portion of the filter wall of the impurity collection filter 2211.

[0048] This design utilizes the rotating motion of the brush 2212 to penetrate the filter holes of the outer cylinder filter screen 211 and the inner cylinder filter screen 214, thereby breaking up or repelling impurities attached to the filter screens and effectively preventing the filter holes from becoming clogged. Simultaneously, the impurity collection filter screen 2211 collects impurities during rotation, further ensuring the filtration effect of the device.

[0049] In practical applications, it is recommended that the brush 2212 possess high hardness to ensure effective dispersing or repelling of impurities, while also having a certain degree of rigid deformation to accommodate rotational motion. Understandably, the brush 2212 can disperse heavy impurities, breaking them down into smaller particles; for lighter impurities such as plastic bags and leaves, it can directly repel them, thus preventing these impurities from covering and clogging the filter pores. Furthermore, the impurity collection filter 2211 can be welded integrally with the connecting rod 2232 in the transmission component 223. Through the cooperative design between the impurity collection filter 2211, the inner cylinder filter 214, and the outer cylinder filter 211, a triple filtration structure can be formed, further enhancing the filtration effect.

[0050] In a further preferred embodiment of this utility model, such as Figure 8 As shown, the impurity collection filter 2211 is a spiral filter.

[0051] The impurity collection filter 2211 employs a spiral design, which not only effectively expands the collection area and improves collection efficiency, but also guides impurities to gradually move towards the inner end during the filter's rotation, thereby reducing the possibility of impurities being thrown out. Furthermore, the spiral filter generates centrifugal force during rotation, which helps to dislodge impurities adhering to the filter surface, further reducing the risk of filter clogging.

[0052] In practical applications, if the impurity collection filter 2211 is a spiral filter, it is recommended that the brush 2212 cover 3 / 4 of the filter wall while avoiding the filter holes. The remaining 1 / 4 of the filter wall should not be equipped with the brush 2212 to leave a collection port for impurity collection.

[0053] In a further preferred embodiment of this utility model, the filter hole diameters of the outer cylinder filter screen 211 and the end cap filter screen 212 are both set to 5 mm, the filter hole diameter of the impurity collection filter screen 2211 is set to 3-4 mm, and the filter hole diameter of the inner cylinder filter screen 214 is set to 1-2 mm.

[0054] This design maximizes the pore size of the outer cylinder filter screen 211 and the end cap filter screen 212, centrally positions the pores of the impurity collection filter screen 2211, and maximizes the pore size of the inner cylinder filter screen 214. Through this triple filtration structure, water undergoes progressively finer filtration before entering the connecting pipe 23 for transport.

[0055] In a further preferred embodiment of this utility model, such as Figure 4 , Figure 5 As shown, the drive component 222 uses an electric motor as the drive power source, and the transmission component 223 includes a coupling 2231 and a connecting rod 2232. The connecting rod 2232 is connected to the impurity collection filter screen 2211, and the coupling 2231 connects the connecting rod 2232 to the drive shaft of the drive component 222.

[0056] This design achieves a physical connection between the drive shaft of the drive component 222 and the connecting rod 2232 of the transmission component 223 through the coupling 2231, thus facilitating drive rotation. After the drive component 222 starts, it transmits power to the connecting rod 2232 through the coupling 2231, and the connecting rod 2232 then drives the impurity collection filter screen 2211 and its brushes 2212 to rotate. This design ensures that the entire filtration device has a compact structure, stable operation, and improves filtration efficiency and reliability.

[0057] In a further preferred embodiment of this utility model, such as Figure 2 , Figure 4 As shown, the drive shaft of the drive component 222 is sealed to the sealing cover plate 224, and the sealing cover plate 224 is installed on the tank body of the water tank 1.

[0058] This design allows the drive component 222 to be mounted on the housing via a sealing cover 224. At the same time, the design of the sealing cover 224 also enhances the sealing performance of the device, reduces water leakage, and improves overall safety and energy efficiency.

[0059] In practical applications, the sealing cover 224 mainly consists of a cover plate 2241 and a sealing gasket 2242. The sealing gasket 2242 fits tightly with the cover plate 2241 and is fixed to the side plate of the water tank 1 by fasteners, thereby achieving a seal. In addition, the cover plate 2241 is also mounted on the drive shaft of the drive component 222 by a mechanical seal assembly. Specifically, a rotary seal is formed by the cooperation of a rotating ring and a stationary ring to prevent water in the water tank 1 from seeping out through the gap around the drive shaft and causing leakage.

[0060] This utility model also proposes a water tank 1, which includes a tank body and the aforementioned anti-clogging filter device 2 installed on the tank body. The anti-clogging filter device 2 is equipped with an impurity cleaning component 22, which can automatically remove impurities attached to the filter screen body 21, effectively preventing clogging, ensuring the reliability of water intake, avoiding downtime, and reducing the frequency of regular maintenance.

[0061] This utility model also proposes an evaporative cooling unit, including the aforementioned water tank 1. This evaporative cooling unit not only possesses the cooling function of a traditional evaporative cooling unit, but also achieves more stable operation by integrating the aforementioned water tank 1 design. The anti-clogging filter device 2 inside the water tank 1 effectively prevents impurities from clogging the unit, ensuring smooth flow of cooling water and thus improving the cooling efficiency of the evaporative cooling unit.

[0062] To provide a clearer understanding, the water tank 1 equipped with the anti-clogging filter device 2 will be described in detail below with reference to the accompanying drawings.

[0063] like Figures 1 to 8As shown, the water tank 1 mainly consists of a tank body and an anti-clogging filter device 2. The tank body is formed by a bottom plate and multiple side plates, which together enclose a water storage chamber. One of the side plates has a water outlet. The specific location of the water inlet is not specified here. The anti-clogging filter device 2 mainly consists of a filter screen body 21 and an impurity cleaning assembly 22. The filter screen body 21 includes an inner cylinder filter screen 214, an outer cylinder filter screen 211, an end cap filter screen 212, and a rotating cover 213. The filter screen body 21 is connected to a flange 24 installed at the water outlet via a connecting pipe 23, thereby allowing the filtered water to be transported out. The impurity cleaning assembly 22 includes a cleaning component 221 consisting of a brush 2212 and an impurity collection filter screen 2211, a transmission component 223 consisting of a connecting rod 2232 and a coupling 2231, and a drive component 222. The drive component 222 uses a motor as the driving power source, and the motor drive shaft is installed on the side plate of the tank body via a sealing cover plate 224.

[0064] In practical applications, if the water quality is poor and the filter screen body 21 is in a static clogged state, the motor will start running. The connecting rod 2232 is driven by the coupling 2231, causing the impurity collection filter screen 2211 to rotate clockwise. Simultaneously, the rigid brush 2212 on the filter screen also rotates, cleaning the filter screen surface. The rigid brush 2212 extends into the filter holes of the inner and outer cylindrical filter screens, breaking down accumulated impurities into smaller particles. Furthermore, the rigid brush 2212 can also repel large debris such as plastic bags and leaves covering the inner and outer cylindrical filter screens, preventing them from clogging the filter holes. Through the continuous cycle of breaking down, repelling, and removing impurities, even in environments with high levels of impurities, the water quality entering the pump can be ensured to meet standards, thus guaranteeing the normal operation of the entire machine. At the same time, the vortex-shaped impurity collection filter screen 2211 continuously collects impurities, facilitating regular cleaning.

[0065] Therefore, a preferred embodiment of this utility model proposes an anti-clogging filter device suitable for open water tanks. Upon startup, the device physically cleans the filter pore surface with a brush, and combined with a triple-filter structure, automatically removes impurities accumulated on the filter, removes large adsorbents, and collects fine particles from within, thereby ensuring the stability and reliability of the incoming water.

[0066] In the description of this utility model, it should be understood that, unless otherwise expressly specified and limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it may be directly connected to or indirectly connected to the other element.

[0067] Furthermore, the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0068] 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 one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0069] Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0070] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A clog-resistant filter device for a water tank, characterized in that, include: The filter screen body is located inside the water tank and is connected to the water outlet of the water tank via a connecting pipe; An impurity cleaning assembly includes a cleaning component located inside the filter body, a driving component located outside the water tank, and a transmission component connecting the cleaning component and the driving component. The cleaning component rotates under the drive of the driving component to remove impurities attached to the filter body. The filter body includes an outer cylindrical filter, an end cap filter, and a rotating cover that together form a filter chamber. The end cap filter is installed on the connecting pipe, and the rotating cover is installed on the transmission component, with a rotation gap between it and the outer cylindrical filter. The cleaning component includes an impurity collection filter and a brush, with the brush disposed on a portion of the filter wall of the impurity collection filter. The transmission component includes a coupling and a connecting rod. The connecting rod is connected to the impurity collection filter screen, and the coupling connects the connecting rod to the drive shaft of the drive component.

2. The anti-clogging filter device for a water tank as described in claim 1, characterized in that, The filter body also includes an inner cylinder filter screen, which is installed on the end cap filter screen. A first sub-filter chamber is formed inside the inner cylinder filter screen and communicates with the connecting pipe. A second sub-filter chamber is formed between the inner cylinder filter screen and the outer cylinder filter screen. The cleaning component is rotatably disposed in the second sub-filter chamber.

3. The anti-clogging filter device for a water tank as described in claim 1, characterized in that, The impurity collection filter is a spiral filter.

4. The anti-clogging filter device for a water tank as described in claim 2, characterized in that, The filter pore diameters of the outer cylinder filter and the end cap filter are both set to 5 mm, the filter pore diameter of the impurity collection filter is set to 3-4 mm, and the filter pore diameter of the inner cylinder filter is set to 1-2 mm.

5. The anti-clogging filter device for a water tank as described in claim 1, characterized in that, The drive shaft of the drive component is sealed to the sealing cover plate, which is installed on the tank body of the water tank.

6. A water tank, characterized in that, It includes a tank and an anti-clogging filter device for a water tank as described in any one of claims 1-5, mounted on the tank.

7. An evaporative cooling unit, characterized in that, Includes the water tank as described in claim 6.

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