Stacked filtering mechanism and fish tank

Abstract

The utility model discloses a laminated filtering mechanism which comprises at least two filtering boxes, each filtering box is internally provided with a water conveying pipe and a water outlet, the water conveying pipes in the adjacent filtering boxes are connected, the side edge of the filtering box located at the bottom is provided with a water outlet, and the water outlet is communicated with the water outlet. The water conveying pipe of the filtering box located at the top is sequentially communicated with the water discharging opening and the water outlet of each filtering box, filtering materials are arranged in the filtering boxes, and the water outlet pipe of the first water pump assembly is connected with the water conveying pipe of the filtering box located at the bottom. According to the laminated filtering mechanism, the filtering capacity and the cruising ability can be improved through a simple structural design.

Description

Technical Field

[0001] The utility model relates to the technical field of fish tanks, in particular to a stacked filtering mechanism and a fish tank. Background Art

[0002] As users' requirements for indoor ambiance and scenes increase, home fish tanks are becoming more and more popular among consumers. However, as the number of fish in the tank increases or the water is not changed for a long time, fish health problems caused by the water quality of the tank will gradually appear. If the water quality is too turbid for a long time, it may cause the fish in the tank to die.

[0003] A typical fish tank water filter uses a water pump to pump water to a high point in the fish tank and allows the water to fall into the filter cotton to filter out impurities. However, this filter structure can only accommodate a small amount of filter cotton and needs to be replaced frequently. This can cause great trouble for users who need to travel far or do not have time to frequently replace the filter material. Utility Model Content

[0004] In order to solve the above technical problems, the present invention proposes a stacked filtering mechanism and a fish tank. Through the continuously stacked and accumulated filtering structure, the user can customize the filtering capacity and endurance of the fish tank.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The present application discloses a stacked filtering mechanism, comprising a first water pump assembly and at least two filter boxes stacked in sequence from top to bottom and detachable, each of the filter boxes being provided with a water pipe and a water outlet, the water pipes in adjacent filter boxes being connected, a water outlet being provided on the side of the filter box at the bottom, the water pipe of the filter box at the top being connected with the water outlet and the water outlet of each of the filter boxes in sequence, a filter material being provided in the filter box, and the water outlet pipe of the first water pump assembly being connected to the water pipe of the filter box at the bottom.

[0007] In the stacked filtration mechanism of the present application, the filter cartridges are stacked and detachably arranged. A water pump, through the water pipe in the bottom filter cartridge, sequentially pumps water from bottom to top through the water pipes of each filter cartridge, lifting the water to the top filter cartridge. The water then begins to be discharged from the top filter cartridge and falls downward into each filter cartridge in sequence, ultimately being discharged from the water outlet of the bottom filter cartridge to complete purification. The number of filter cartridges can be increased or decreased as needed by the user. Increasing the number of stacked filter cartridges increases the amount of filter material that the water passes through during its fall, thereby improving the ultimate filtration capacity and the filter life of the stacked filtration mechanism, and reducing the frequency of replacement.

[0008] In one embodiment, the filter box includes a first filter box, a second filter box and a third filter box, and the first filter box, the second filter box and the third filter box are all provided with the water pipe, the water pipes in the first filter box, the second filter box and the third filter box are connected in sequence, and the outlet pipe of the first water pump assembly is connected to the water pipe of the third filter box; the first filter box is provided with a first water outlet, the second filter box is provided with a second water outlet, and the side of the third filter box is provided with the water outlet, and the water pipe of the first filter box is connected with the first water outlet, the second water outlet and the water outlet in sequence.

[0009] The first, second, and third filter cartridges are stacked and removable. A water pump pumps water through the water pipes of each filter cartridge to the first filter cartridge. Water then flows from the first filter cartridge into the second and third filter cartridges, and finally exits the water outlet of the third filter cartridge to complete purification. The second filter cartridge can be added or removed as needed. Increasing the number of stacked second filter cartridges increases the amount of filter material the water passes through during its descent, thereby improving the final filtration capacity and the filter life of the stacked filter mechanism, reducing the frequency of replacement.

[0010] In one embodiment, a first accommodating groove is provided on the top of the first filter box, and a first water outlet is provided at the bottom of the first accommodating groove; a second accommodating groove is provided on the top of the second filter box, and the second water outlet is provided at the bottom of the second accommodating groove; a third accommodating groove is provided on the top of the third filter box; the first accommodating groove and the second accommodating groove are connected through the first water outlet, and the third accommodating groove and the second accommodating groove are connected through the second water outlet; the first accommodating groove, the second accommodating groove, and the third accommodating groove are used to place filter materials; the water supply pipe of the first filter box is provided at the bottom of the first accommodating groove, the water supply pipe of the second filter box is provided at the bottom of the second accommodating groove, and the water supply pipe of the third filter box is provided at the bottom of the third accommodating groove. The first accommodating groove, the second accommodating groove, and the third accommodating groove can all be used as space for placing filter materials, thereby maximizing the amount of filter materials in the stacked filter mechanism and improving the filtering capacity.

[0011] In one embodiment, the number of the second filter cartridges is at least two, and each second filter cartridge is stacked between the first filter cartridge and the third filter cartridge. As described above, multiple second filter cartridges can increase the amount of filter media that water flows through, thereby improving filtering capacity.

[0012] In one embodiment, a first receiving groove is defined at the top of the first filter cartridge, the first drain outlet is defined at the bottom of the first receiving groove, an overflow outlet is defined on the sidewall of the first receiving groove, and an overflow plate is provided in the first receiving groove to separate the overflow outlet from the first drain outlet, wherein the height of the overflow plate is lower than the height of the first receiving groove. When water in the first filter cartridge cannot be promptly drained from the first drain outlet to the second filter cartridge, the accumulated water therein, when exceeding the height of the overflow plate, will fall into the space between the overflow plate and the overflow outlet and be discharged from the overflow outlet, thereby preventing the increasing accumulated water from overflowing from various parts of the first filter cartridge.

[0013] In one embodiment, the outer sides of the first filter box and the second filter box are both concave to form a guide groove, the guide grooves of the first filter box and the second filter box are vertically connected, and the overflow port is located at the bottom of the guide groove on the first filter box. Due to the concave guide groove structure, overflowing water can flow downward along the guide groove, preventing it from flying too far from the overflow port and splashing outside the fish tank.

[0014] In one embodiment, a water pump is provided in the first water pump assembly, and the direction of the water inlet of the water pump is opposite to the direction of the water outlet of the third filter box.

[0015] In one embodiment, a spray head is provided on the top of the first filter box, and the spray head is connected to the water pipe of the first filter box and is located above the first drain port.

[0016] The present application also discloses a fish tank, comprising a tank body, a casing, and the stacked filter mechanism described in any one of the above items. The casing is fixed in the tank body and has a first mounting groove, and the stacked filter mechanism is arranged in the first mounting groove.

[0017] In one embodiment, the fish tank further includes a second water pump assembly. The housing further defines a second mounting slot communicating with the first mounting slot, and the second water pump assembly is disposed in the second mounting slot. When in operation, the second water pump assembly can draw residual water from the vicinity of the second mounting slot, thereby driving water flow in the first mounting slot, ultimately providing suction to the water outlet in the first mounting slot, thereby sucking out filtered water reaching the third filter cartridge and promoting water flow in the stacked filtration mechanism.

[0018] In one embodiment, the fish tank further includes a top cover mounted on the top of the tank body, the top cover defining a clearance opening above the stacked filter mechanism. The clearance opening is sized to accommodate the stacked filter mechanism to allow passage of the stacked filter mechanism, and a removable shield is provided on the clearance opening. When a plurality of second filter cartridges are not required, the entire stacked filter mechanism can be stored beneath the clearance opening, with the clearance opening then covered by the shield. When a plurality of second filter cartridges are required, the shield is removed, and the required number of second filter cartridges are stacked between the first and third filter cartridges. The overall height of the stacked filter mechanism is increased, and the upper portion of the stacked filter mechanism can be extended from the clearance opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an exploded view of a fish tank equipped with a stacked filter mechanism disclosed in one embodiment of the present application;

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure of the fish tank after removing the top cover and the shield;

[0021] Figure 3 yes Figure 2 A schematic diagram of the stacked filter mechanism and the second water pump assembly being removed from the fish tank;

[0022] Figure 4 This is a schematic structural diagram of a stacked filtering mechanism disclosed in one embodiment of the present application;

[0023] Figure 5 is a cross-sectional schematic diagram of a stacked filter mechanism disclosed in one embodiment of the present application;

[0024] Figure 6 This is an exploded view of a stacked filter mechanism disclosed in one embodiment of the present application;

[0025] Figure 7 This is a schematic structural diagram of the third filter box in the stacked filter mechanism disclosed in one embodiment of the present application;

[0026] Description of Figure Numbers:

[0027] Fish tank 10; tank body 110; top cover 120; avoidance opening 121 shield 130;

[0028] Housing 20; first mounting groove 201; second mounting groove 202; water hole 203;

[0029] Stacked filter mechanism 30; water pipe 301; buckle 302; guide groove 303; first filter box 310; first water outlet 311; first receiving groove 312; overflow plate 313; overflow outlet 314; second filter box 320; second water outlet 321; second receiving groove 322; third filter box 330; third water outlet 331; third receiving groove 332; water outlet 335; first water pump assembly 340; water pump 341; water outlet pipe 342; water inlet grille 343; sprinkler head 350; water baffle 360;

[0030] Second water pump assembly 40 . DETAILED DESCRIPTION

[0031] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is merely illustrative and is not intended to limit the scope and application of the present invention.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit / signal communication.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0035] The water quality of the fish tank 10 will greatly affect the survival rate of the fish. When the number of fish in the fish tank 10 increases or the water is not changed for a long time, the water quality of the fish tank 10 will become turbid, and the health problems of the fish will gradually appear. If the water quality is too turbid for a long time, it may cause the death of the fish in the fish tank 10. The water quality filter of the general fish tank 10 uses a water pump to pump water to a high point in the fish tank 10 and let the water flow into the filter cotton to filter out impurities. However, this filter structure can accommodate less filter cotton and needs to be replaced frequently. It will cause great trouble for users who need to travel far or do not have time to frequently replace the filter material. In order to improve the filtering capacity of the fish tank 10 and the service life of the filtering mechanism, the present application provides a stacked filtering mechanism 30 and a fish tank 10. The stacked filtering mechanism 30 is installed in the fish tank 10 to efficiently filter the water therein.

[0036] refer to Figures 1 to 3 The fish tank 10 includes a tank body 110 and a top cover 120. The tank body 110 is used to fill with water to provide space for fish to move around. The top cover 120 is installed on the top of the tank body 110 to prevent dust and splashing of water in the tank. A casing 20 is provided in the tank body 110 for storing various accessories. The casing 20 can be fastened to the top edge of the tank body 110 by means of a snap 302. A first mounting groove 201 is provided downwardly at the top of the casing 20. The first mounting groove 201 is used to place the stacked filter mechanism 30. The water in the tank body 110 can flow into the first mounting groove 201 through the water hole 203 on the side of the casing 20, and then be extracted by the stacked filter mechanism 30.

[0037] refer to Figure 4 and Figure 5 The stacked filtration mechanism in the embodiment of the present application includes a first water pump assembly and at least two filter boxes stacked and detachably arranged from top to bottom. Each filter box is provided with a water pipe and a drain outlet. The water pipes in adjacent filter boxes are connected. A water outlet is provided on the side of the filter box at the bottom. The water pipe of the filter box at the top is sequentially connected with the drain outlet and the water outlet of each filter box arranged from top to bottom. The filter box is provided with filter material. The outlet pipe of the first water pump assembly is connected to the water pipe of the filter box at the bottom. In the stacked filtration mechanism of the present application, the filter boxes are stacked and detachably arranged. The water pump lifts the water from the bottom to the top through the water pipes of each filter box through the water pipe in the bottom filter box, and starts to discharge from the top filter box to fall downward into each filter box in sequence, and finally discharges from the outlet of the bottom filter box to complete purification. The number of filter cartridges can be increased or decreased according to user needs. Increasing the number of stacked filter cartridges can increase the amount of filter material that water passes through during the falling process, thereby improving the final filtering capacity and the filtering life of the stacked filter mechanism and reducing the frequency of replacement.

[0038] The filter box includes a first filter box 310 , a second filter box 320 and a third filter box 330 . Correspondingly, the stacked filtering mechanism 30 includes a first water pump assembly 340 and a first filter box 310, a second filter box 320 and a third filter box 330 that are stacked and detachable from top to bottom. The first filter box 310, the second filter box 320 and the third filter box 330 are all provided with a water pipe 301, and the water pipes 301 in the first filter box 310, the second filter box 320 and the third filter box 330 are connected in sequence. The water outlet pipe 342 of the first water pump assembly 340 is connected to the water pipe 301 of the third filter box 330; a first water outlet 311 is provided in the first filter box 310, a second water outlet 321 is provided in the second filter box 320, and a water outlet 335 is opened on the side of the third filter box 330. The water pipe 301 of the first filter box 310 is connected to the first water outlet 311, the second water outlet 321 and the water outlet 335 in sequence, and the second filter box 320 is provided with filter material. It should be noted that filter materials, such as filter cotton, energy balls, etc., can be provided in the first filter box 310 , the second filter box 320 , and the third filter box 330 .

[0039] In the stacked filter mechanism 30 of the present application, the first filter box 310, the second filter box 320, and the third filter box 330 are stacked and detachably arranged. The first water pump assembly 340 lifts the water flow to the first filter box 310 through the water supply pipes 301 of each filter box. The water then flows from the first filter box 310 into the second filter box 320 and the third filter box 330, and is finally discharged from the water outlet 335 of the third filter box 330 to complete the purification. The second filter box 320 can be increased or decreased as needed by the user. Increasing the number of stacked second filter boxes 320 can increase the amount of filter material that the water passes through during the falling process, thereby improving the final filtering capacity and the filtration life of the stacked filter mechanism 30, and reducing the replacement frequency. The first water pump assembly 340 and the third filter cartridge 330 are both located at the bottom of the first filter cartridge 310 and the second filter cartridge 320. This means that both pumping and draining water can occur below the surface of the fish tank 10, effectively reducing water flow noise during filtration. Furthermore, the outlet 335 of the third filter cartridge 330 is located on the sidewall, making drainage less likely to be obstructed, thereby increasing filtration efficiency. This stacked filter mechanism 30 improves filtration capacity and battery life through a simple structural design.

[0040] The first water pump assembly 340 is located at the bottom of the third filter cartridge 330 and includes a water pump 341. The outlet pipe 342 of the water pump 341 is connected to the water supply pipe 301 of the third filter cartridge 330. Similarly, the water supply pipes 301 of the first filter cartridge 310, the second filter cartridge 320, and the third filter cartridge 330 can also be sealed and connected to each other. A water inlet grille 343 is provided on the outer surface of the first water pump assembly 340. The water inlet of the water pump 341 is located near the water inlet grille 343, and a filter is installed at the water inlet of the water pump. The water inlet of the water pump 341 is oriented opposite to the water outlet 335 of the third filter cartridge 330, effectively preventing the purified water discharged from the water outlet 335 from being immediately drawn back into the first water pump assembly 340. The housing 20 has a water hole 203 on the side near the bottom. The water inlet grille 343 on the outer surface of the first water pump assembly 340 is aligned with the water hole 203. The housing 20 is connected to the water in the cylinder 110 through the water hole 203. Figure 5 As shown in the arrow direction, the water pump 341 sucks the water flow from the bottom of the cylinder body 110, pumps the water upward to the first filter box 310 through each water pipe 301, and is discharged from the water pipe 301 in the first filter box 310. After that, the water is filtered through the filter materials in the first filter box 310, the second filter box 320 and the third filter box 330 in sequence, and then discharged from the water outlet 335 on the side of the third filter box 330 into the first installation groove 201.

[0041] exist Figure 5 In the embodiment shown in , a spray head 350 is further provided at the top of the first filter cartridge 310. The spray head 350 is connected to the water pipe 301 of the first filter cartridge 310 and is located above the first drain port 311. The spray head 350 can evenly disperse the water flow so that it drips onto the filter material of the first filter cartridge 310, fully and evenly utilizing all parts of the filter material. The spray head 350 can be fixed to the first filter cartridge 310 by a snap-fit connection. In other embodiments, the water pipe in the first filter cartridge 310 can be bent and extended above the first drain port 311. In this case, the water discharged from the water pipe of the first filter cartridge 310 can directly fall onto the filter material on the first drain port 311.

[0042] To promote filtration circulation, the housing 20 further defines a second mounting slot 202, which communicates with the first mounting slot 201. A second water pump assembly 40 is located within the second mounting slot 202. When in operation, the second water pump assembly 40 draws residual water from the vicinity of the second mounting slot 202, thereby driving water flow in the first mounting slot 201. Ultimately, it provides suction to the water outlet 335 located within the first mounting slot 201, drawing out the filtered water that reaches the third filter cartridge 330. This encourages water flow within the stacked filter mechanism 30 and accelerates the filtration cycle. The second water pump assembly 40 draws water from the second mounting slot 202, then lifts it to the surface of the water in the cylinder 110 and drains it back into the cylinder 110 through the housing 20. In embodiments employing the second water pump assembly 40, the water outlet 335 of the stacked filter mechanism 30 faces the second water pump assembly 40.

[0043] Re-reference Figure 1 and Figure 4 In some embodiments, there are at least two second filter cartridges 320, each of which is stacked between the first filter cartridge 310 and the third filter cartridge 330. Since multiple second filter cartridges 320 can be stacked, the height of the stacked filter mechanism 30 may be higher than the fish tank 10. Therefore, in one embodiment, the top cover 120 is provided with an escape opening 121 above the stacked filter mechanism 30. The size of the escape opening 121 matches the stacked filter mechanism 30 to allow the stacked filter mechanism 30 to pass through. A detachable shield 130 is provided on the escape opening 121. When there is no need to stack too many second filter boxes 320, the entire stacked filter mechanism 30 can be stored under the avoidance opening 121, and the avoidance opening 121 is covered by the shield 130; when more second filter boxes 320 are to be stacked, the shield 130 is removed, and the required number of second filter boxes 320 are stacked between the first filter box 310 and the third filter box 330. At this time, the overall height of the stacked filter mechanism 30 is increased, and its upper part can be extended from the avoidance opening 121.

[0044] refer to Figures 5 to 7 The first filter box 310 has a first receiving groove 312 at its top, and a first drain port 311 at its bottom. The second filter box 320 has a second receiving groove 322 at its top, and a second drain port 321 at its bottom. The third filter box 330 has a third receiving groove 332 at its top. The first receiving groove 312 and the second receiving groove 322 are connected via the first drain port 311, and the third receiving groove 332 and the second receiving groove 322 are connected via the second drain port 321. The first, second, and third receiving grooves 312, 322, and 332 are used to accommodate filter materials. The spray head 350 in the above embodiment is located above the first receiving groove 312.

[0045] Correspondingly, the water supply pipe 301 of the first filter cartridge 310 is installed at the bottom of the first receiving groove 312, the water supply pipe 301 of the second filter cartridge 320 is installed at the bottom of the second receiving groove 322, and the water supply pipe 301 of the third filter cartridge 330 is installed at the bottom of the third receiving groove 332. One end of the water supply pipe 301 extends upward from the bottom of each receiving groove until it is nearly flush with the top surface of the receiving groove; the other end of the water supply pipe 301 passes through the bottom of the receiving groove and is nearly flush with the bottom end surface of the filter cartridge. Each adjacent filter cartridge, namely the first filter cartridge 310, the second filter cartridge 320, and the third filter cartridge 330, can be fixed together by means of a snap 302, or by providing a retaining groove for mutual interlocking and fixing.

[0046] When the filter material in the first filter box 310 contains too much impurities and cannot promptly transmit the water to the second filter box 320, water will accumulate inside the first filter box 310 and overflow will occur. Figure 6 In some embodiments, an overflow port 314 may be provided on the sidewall of the first receiving tank 312. An overflow plate 313 may be provided in the first receiving tank 312 to separate the overflow port 314 from the first drain port 311. The overflow plate 313 is lower than the height of the first receiving tank 312. When water in the first filter cartridge 310 cannot be promptly drained from the first drain port 311 to the second filter cartridge 320, the accumulated water therein, when exceeding the height of the overflow plate 313, will fall into the space between the overflow plate 313 and the overflow port 314 and be discharged from the overflow port 314. This prevents the increasing accumulated water from overflowing from various locations in the first filter cartridge 310.

[0047] Further, refer to Figure 6 In one embodiment, the outer sides of the first filter box 310 and the second filter box 320 are both concave to form a guide groove 303. The guide groove 303 extends in the height direction and is vertically connected to the guide grooves 303 of the first filter box 310 and the second filter box 320. The overflow port 314 is located at the bottom of the guide groove 303 on the first filter box 310. Due to the concave guide groove 303 structure, overflowing water can flow downward along the guide groove 303, preventing it from flying too far from the overflow port 314 and splashing outside the fish tank 10.

[0048] During the production process, in order to save mold costs, the third filter box 330 and the second filter box 320 can be produced using the same mold. At this time, the bottom of the third filter box 330 will also form a third drain port 331 with the same structure as the second drain port 321. At this time, the drain port can be blocked by fixing a water baffle 360 at the bottom of the third filter box 330, so that the water flow can only be discharged to the outlet 335 on the side wall of the third filter box 330.

[0049] The background section of the invention may contain background information about the problem or environment of the invention, rather than describing the prior art by others. Therefore, the content included in the background section is not an admission by the applicant that the prior art is available.

[0050] The above content is a further detailed description of the present invention in conjunction with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be considered to belong to the scope of protection of the present invention. In the description of this specification, the reference terms "one embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in an appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction. Although the embodiments of the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the present invention as defined by the appended claims.

Claims

1. A stacked filter mechanism, characterized in that: It includes a first water pump assembly and at least two filter boxes that are stacked and detachable from top to bottom, each of the filter boxes is provided with a water pipe and a water outlet, the water pipes in adjacent filter boxes are connected, a water outlet is provided on the side of the filter box at the bottom, the water pipe of the filter box at the top is connected with the water outlet and the water outlet of each filter box in turn, the filter box is provided with filter material, and the water outlet pipe of the first water pump assembly is connected to the water pipe of the filter box at the bottom.

2. The stacked filter mechanism according to claim 1, characterized in that: The filter box includes a first filter box, a second filter box and a third filter box. The first filter box, the second filter box and the third filter box are all provided with the water pipe. The water pipes in the first filter box, the second filter box and the third filter box are connected in sequence, and the outlet pipe of the first water pump assembly is connected to the water pipe of the third filter box; the first filter box is provided with a first water outlet, the second filter box is provided with a second water outlet, and the side of the third filter box is provided with the water outlet. The water pipe of the first filter box is connected with the first water outlet, the second water outlet and the water outlet in sequence.

3. The stacked filter mechanism according to claim 2, characterized in that: A first receiving groove is provided on the top of the first filter box, and the first water outlet is provided at the bottom of the first receiving groove; a second receiving groove is provided on the top of the second filter box, and the second water outlet is provided at the bottom of the second receiving groove; a third receiving groove is provided on the top of the third filter box; the first receiving groove and the second receiving groove are connected through the first water outlet, and the third receiving groove and the second receiving groove are connected through the second water outlet. The first receiving groove, the second receiving groove and the third receiving groove are used to place filter materials. The water supply pipe of the first filter box is passed through the bottom of the first receiving groove, the water supply pipe of the second filter box is passed through the bottom of the second receiving groove, and the water supply pipe of the third filter box is passed through the bottom of the third receiving groove.

4. The stacked filter mechanism according to claim 2, characterized in that: There are at least two second filter boxes, and each second filter box is stacked between the first filter box and the third filter box.

5. The stacked filter mechanism according to claim 2, characterized in that: A first receiving groove is provided on the top of the first filter box, the first drain is provided at the bottom of the first receiving groove, an overflow port is provided on the side wall of the first receiving groove, and an overflow plate is provided in the first receiving groove to separate the overflow port from the first drain, and the height of the overflow plate is lower than the height of the first receiving groove.

6. The stacked filter mechanism according to claim 5, characterized in that: The outer sides of the first filter box and the second filter box are both concave to form a guide groove, the guide grooves of the first filter box and the second filter box are connected in the height direction, and the overflow port is opened at the bottom of the guide groove on the first filter box.

7. The stacked filter mechanism according to claim 1, characterized in that: The first water pump assembly is provided with a water pump, and the direction of the water inlet of the water pump is opposite to the direction of the water outlet of the third filter box.

8. A fish tank, characterized in that: It comprises a cylinder body, a casing and the stacked filter mechanism according to any one of claims 1 to 7, wherein the casing is fixed in the cylinder body and is provided with a first mounting groove, and the stacked filter mechanism is arranged in the first mounting groove.

9. The fish tank according to claim 8, characterized in that It also includes a second water pump assembly. The housing is further provided with a second mounting groove connected to the first mounting groove. The second water pump assembly is arranged in the second mounting groove.

10. The fish tank according to claim 8, characterized in that It also includes a top cover arranged on the top of the cylinder body, the top cover is provided with an escape opening above the stacked filtering mechanism, the size of the escape opening matches the stacked filtering mechanism to allow the stacked filtering mechanism to pass through, and the escape opening cover is provided with a detachable shield.

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