CN218921339U - Combined type fish tank filter tank - Google Patents

Abstract

The utility model relates to a combined type fish tank filter tank, which comprises a water inlet tank and a water outlet tank, wherein the bottom wall of the water inlet tank is provided with a water inlet A, the water outlet tank is provided with a water outlet A, the left side wall of the water inlet tank is provided with a convex connecting part A, the middle part of the connecting part A is provided with a water guide port, the outer side surface of the connecting part A is provided with a sleeve and a surface, and the right side wall of the water outlet tank is provided with a connecting hole D; the device also comprises an extension groove B, wherein the extension groove B comprises a connecting part B arranged on the left side wall and a connecting hole B arranged on the right side wall; still include the fastener, thereby fastener cover is established fastening connection portion B and connecting hole D's connection on connecting portion B realizes that intake channel, extension tank B and play basin from right to left fastening connection in proper order, intake channel and play basin set up water inlet A and delivery port A respectively, need not to immerse the filter vat in the water body, and can place the filter media of multiple different materials, and the filter media can directly take out from the inslot in the filter vat, promotes space utilization, practices thrift production and sale cost, stable in quality.

Description

Combined type fish tank filter tank

Technical Field

The utility model relates to the field of fish tanks, in particular to a combined type fish tank filter tank.

Background

Along with the continuous improvement of living standard, aquatic organisms such as aquarium fish are raised in families and working environments by adopting a fish tank to become a recreational and recreational mode for adjusting living and improving living quality, in order to reduce the number of times of water replacement in the fish tank and improve the quality of water so that the aquatic organisms can survive better, the fish tank adopts a filter tank to filter the water, and filter materials such as filter cotton, sand and stone are placed in the filter tank to filter out harmful substances so as to improve the water quality. At present, for further promoting the filter effect, the filter vat is provided with a plurality of grooves for placing different filter media in order to further promote the filter effect more, but these filter vats are all integrative setting, because the fish bowl of matching is different, the model size of corresponding filter vat that needs is also different correspondingly, and this just needs different production flows and packing transportation requirement, greatly increased manufacturing cost, lack product competitiveness.

The utility model of China patent No. 217936945U provides a multi-layer filtering fish tank filter, which comprises a main body, a first filtering shell and a second filtering shell, wherein the first filtering shell is detachably connected to the bottom of the main body, the second filtering shell is detachably connected to the bottom of the first filtering shell and is communicated with the first filtering shell, the bottom of the main body is provided with a water inlet communicated with the first filtering shell, the side surface or the top surface of the main body is provided with a water outlet, a pump body connected with the water inlet and the water outlet respectively is arranged in the main body, sponge filtering bodies are arranged in the first filtering shell and the second filtering shell, and water inlet structures are arranged on the side surfaces of the first filtering shell and the second filtering shell. This filter adopts the lock joint structure to realize dismantling and connects, and its first filtration shell and second filtration shell must submergence water back just can work, and this has not only restricted the filter media and can only use the sponge filter body, and it is inconvenient to use to change inside filter cotton moreover and need take out the back operation in aqueous, soaks moreover and often open and shut and can cause fastener and clasp easily to damage, and product quality stability is relatively poor.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide a combined fish tank filter tank which can be separated from water body to work and is convenient to operate. The technical aim of the utility model is realized by the following technical scheme:

the combined fish tank filter tank comprises a water inlet tank and a water outlet tank, wherein a water inlet A is arranged on the bottom wall of the water inlet tank, a water outlet A is arranged on the water outlet tank, a convex connecting part A is arranged on the left side wall of the water inlet tank, a flow guide port is arranged in the middle of the connecting part A, a sleeve and a surface are arranged on the outer side surface of the connecting part A, and a connecting hole D is formed in the right side wall of the water outlet tank; the device comprises a shell, a connecting hole B, a sleeve and a connecting surface, and also comprises an extension groove B, wherein the extension groove B comprises a connecting part B arranged on the left side wall and a connecting hole B arranged on the right side wall, after the connecting part A passes through the connecting hole B, the sleeve and the surface are attached to the inner side surface of the connecting hole B, the connecting part B has the same structure as the connecting part A, and the connecting hole D has the same structure as the connecting hole B; the water inlet tank, the extension tank B and the water outlet tank are sequentially fastened and connected from right to left.

Further, the fastening piece is an elastic ring, a groove is further formed in the outer side face of the connecting portion A on the left side of the sleeve and the face, the distance from the wall of the right side of the groove to the outer surface of the left side wall of the water inlet groove is smaller than the thickness of the right side wall of the extended groove B, and after the elastic ring is fixed to the groove, the maximum distance between the outer side faces of the elastic ring is larger than the maximum distance between the inner side faces of the connecting holes B.

Furthermore, the center points of the connecting part A, the connecting hole B, the connecting part B and the connecting hole D are on the same horizontal straight line, and the water inlet tank and the water outlet tank, the water inlet tank and the water outlet tank and one or more of the extending tanks B can be freely combined to form fastening connection.

Further, the device also comprises an extension groove C, a connecting part C is arranged on the left side wall of the extension groove C, a connecting hole C is arranged on the right side wall of the extension groove C, the connecting part C and the connecting part B are identical in structure and different in position of respective center points, the connecting hole C and the connecting hole B are identical in structure and different in position of respective center points, the connecting part A, the connecting hole B, the connecting part C and the connecting hole D are in the same horizontal straight line, and the connecting part B and the connecting hole C are in the same horizontal straight line.

Further, the device also comprises an extension groove C, a connecting part C is arranged on the left side wall of the extension groove C, a connecting hole C is arranged on the right side wall of the extension groove C, the connecting part C is identical to the connecting part B in structure, the connecting hole C is identical to the connecting hole B in structure but different in positions of respective center points, the respective center points of the connecting part A and the connecting hole B are on the same horizontal straight line, and the respective center points of the connecting part B, the connecting hole C and the connecting hole D are on the same horizontal straight line.

Further, the device also comprises an extension groove C, wherein a connecting part C is arranged on the left side wall of the extension groove C, a connecting hole C is arranged on the right side wall of the extension groove C, the connecting part C and the connecting part B are identical in structure and different in positions of respective center points, the connecting hole C and the connecting hole B are identical in structure, the respective center points of the connecting part A, the connecting hole B and the connecting part B are in the same horizontal straight line, and the respective center points of the connecting part C and the connecting hole D are in the same horizontal straight line.

Further, the filter further comprises a clamping groove, wherein the clamping groove is arranged on the rear side wall of the filter groove to form a square groove with an opening at the lower end, and the upper side surface of the clamping groove is provided with an inserting hole; the plug-in pin is inserted into the jack to adjust the slot width of the clamping slot.

Further, the elastic ring is further provided with an auxiliary piece, the right side face of the auxiliary piece is provided with a cover groove, the cover groove is covered with the shape of the head on the left side of the connecting portion A, the auxiliary piece is further provided with a placing face for placing the elastic ring, and the elastic ring falls off from the placing face and then enters the groove.

Further, still include the roof groove, roof groove below is provided with the base, the base is fixed on the cell wall of intake groove top, the roof groove diapire is provided with water inlet B, water inlet B with water inlet A shape is the same and on same vertical straight line, roof groove diapire still is provided with a plurality of holes that leak.

Further, the water outlet B is arranged at the upper end of the front side wall of the water outlet tank, the water outlet B is arranged at the bottom wall of the water outlet tank, and the highest point of the water outlet B is lower than the horizontal position of the water outlet A.

Further, the outer surfaces of the side walls of the two adjacent filter tanks are respectively provided with a limit column and a corresponding limit hole, the limit columns are inserted into the corresponding limit holes to form limit, overflow ports are formed in the upper edges of the left side wall and the right side wall of the filter tank and the upper edge of the front side wall of the filter tank, and the overflow ports are lower than the top surface of the side wall of the filter tank.

In summary, compared with the prior art, the utility model has the following beneficial effects: the water inlet tank and the water outlet tank are respectively provided with the water inlet A and the water outlet A, the filter tank is not required to be immersed in water body to work, filtering materials of various different materials can be placed, the optimal filtering effect is achieved, meanwhile, the water inlet tank, the extension tank B and the water outlet tank are directly connected in a combined mode through the connecting parts and the connecting holes which are fastened and protruded through fasteners, the filtering materials in the filter tank can be directly taken out from the tank, the whole structure of the filter tank is not required to be operated, namely, after the first assembly is completed, the fasteners (5) and the connecting parts are not required to be disassembled and assembled later, and therefore, the combined structure can improve the space utilization efficiency, save production and sales cost, and is stable in quality, good in filtering effect and capable of improving the competitiveness of products.

Drawings

FIG. 1 is one of the combined schematic diagrams of the embodiment;

FIG. 2 is a second schematic diagram of an embodiment;

FIG. 3 is an exploded schematic view of an embodiment;

FIG. 4 is a schematic view of the structure of the water inlet tank;

FIG. 5 is a schematic view of the structure of the extension groove B;

FIG. 6 is a schematic structural view of the extension groove C;

FIG. 7 is a schematic view of the structure of the water outlet tank;

FIG. 8 is a schematic view of the structure of the top groove;

FIG. 9 is a schematic view of the structure of the auxiliary element and fastener;

FIG. 10 is a schematic view of the structure of the inlet pipe and the insert sheet;

FIG. 11 is one of the schematic diagrams of the water flow direction;

FIG. 12 is a second schematic view of the direction of water flow;

FIG. 13 is a third schematic view of the direction of water flow;

FIG. 14 is a fourth schematic view of the direction of water flow;

fig. 15 is an enlarged partial schematic view of a cross-sectional view of an embodiment.

Reference numerals:

1. a water inlet tank; 11. a water inlet A; 12. a connection part A; 121. a diversion port; 122. sleeving and kneading; 123. a groove;

2. an elongated slot B; 21. a connecting part B; 22. a connecting hole B;

3. an elongated slot C; 31. a connection part C; 32. a connection hole C;

4. a water outlet tank; 41. a water outlet A; 42. a water outlet B; 43. a connection hole D;

5. a fastener; 51. an elastic ring;

6. a clamping groove; 61. a jack;

7. inserting sheets; 71. pins;

8. a top groove; 81. a base; 82. a water leakage hole; 83. a water inlet B;

011. a limit column; 012. a limiting hole; 020. an overflow port; 030. an auxiliary member; 0301. covering the groove; 0302. placing a surface; 040. a water inlet pipe.

Detailed Description

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The utility model is described in further detail below with reference to the accompanying drawings:

the combined fish tank filter tank is shown in fig. 1-15, and comprises a water inlet tank 1 and a water outlet tank 4, wherein a water inlet A11 is formed in the bottom wall of the water inlet tank 1, the water inlet A11 can be inserted into a water inlet pipe 040 shown in fig. 10, water is sucked from a fish tank through a connecting water pump, the water outlet tank 4 is provided with a water outlet A41, a convex connecting part A12 is arranged on the left side wall of the water inlet tank 1, a water guide opening 121 is formed in the middle of the connecting part A12, the water guide opening 121 is used for flowing out water in the water inlet tank 1, a sleeve and surface 122 is arranged on the outer side surface of the connecting part A12, and a connecting hole D43 is formed in the right side wall of the water outlet tank 4; the device further comprises an extension groove B2, wherein the extension groove B2 comprises a connecting part B21 arranged on the left side wall and a connecting hole B22 arranged on the right side wall, after the connecting part A12 passes through the connecting hole B, the sleeve and the surface 122 are attached to the inner side surface of the connecting hole B22, the connecting part B21 and the connecting part A12 are identical in structure, and the connecting hole D43 and the connecting hole B22 are identical in structure; the water inlet tank 1, the extension tank B2 and the water outlet tank 4 are sequentially and fixedly connected from right to left by the fastener 5, and the fastener 5 is sleeved on the connecting part B21 to fasten the connection of the connecting part B21 and the connecting hole D43. In this embodiment, the fastener 5 may be fastened to the connecting portion B21 by using glue, and the fastener 5 and the connecting portion B21 may be fastened by using nuts and bolts.

In this embodiment, the fastening member 5 is an elastic ring 51, as shown in fig. 15, a groove 123 is further provided on the outer side surface of the connecting portion a12 on the left side of the sleeve and the surface 122, and the distance from the wall of the right side of the groove to the outer surface of the left side wall of the water inlet tank 1 is smaller than the thickness of the right side wall of the elongated slot B2, that is, after the connecting portion a12 passes through the connecting hole B22, the right side wall of the groove 123 is on the right side of the inner surface of the right side wall of the elongated slot B2, and the formed space can be filled with the elastic ring 51, so that the gap between the sleeve and the surface 122 and the inner side surface of the connecting hole B22 is further sealed to prevent water leakage; after the elastic ring 51 is fixed in the groove 123, the maximum distance between the outer side surfaces of the elastic ring 51 is greater than the maximum distance between the inner side surfaces of the connecting holes B22, so that the connecting portion a12 cannot be separated from the connecting holes B22, and the fastening connection between the water inlet tank 1 and the extension tank B2 is realized.

The connecting hole B22 can be in a shape similar to a circle, a polygonal shape or a combination of the two, preferably, the connecting hole B22 is in an oval shape, and compared with a common circle, the oval shape can realize the functions of attractive appearance and water flow passage and simultaneously enable two adjacent filter tanks to be incapable of generating relative rotation after connection, so that the aim of stable connection is fulfilled.

In this embodiment, the center points of the connection portion a12, the connection hole B22, the connection portion B21, and the connection hole D43 are on the same horizontal straight line, and the water inlet tank 1 and the water outlet tank 4 and one or more of the extension tanks B2 may be freely combined to form a fastening connection. The water flow diagram of fig. 11 shows three cases of this embodiment, that is, the horizontal straight lines where the center points of the connecting portion a12, the connecting hole B22, the connecting portion B21 and the connecting hole D43 are located are respectively located at the upper, middle and lower positions, and because the connecting parts of the filter tanks are identical in structure and position, the filter tanks can be freely combined according to the form of connection and the number of connections required, and the number of extension tanks B2 can be one or even more under the condition that the two end water inlet tanks 1 and the two end water outlet tanks 4 are unchanged, even without setting, only the water inlet tanks 1 and the water outlet tanks 4 can be directly connected, therefore, after the positions of the center points of the respective straight lines are determined, only one water inlet tank 1, one water outlet tank 4 and one extension tank B2 are required to be used in three dies or other production processes, so that a plurality of different requirements of fish tanks from short to long with different sizes can be met, namely, cost is saved, and convenience in combination is achieved. Preferably, the positions of the respective center points of the connection portion a12, the connection hole B22, the connection portion B21, and the connection hole D43 are located at the center of the filter sidewall.

As shown in fig. 12, in the second embodiment, the device further includes an extension groove C3, a connecting portion C31 is disposed on a left side wall of the extension groove C3, a connecting hole C32 is disposed on a right side wall of the extension groove C3, the connecting portion C31 and the connecting portion B21 have the same structure but different positions of their respective center points, the connecting hole C32 and the connecting hole B22 have the same structure but different positions of their respective center points, the respective center points of the connecting portion a12, the connecting hole B22, the connecting portion C31 and the connecting hole D43 are on the same horizontal straight line, and the respective center points of the connecting portion B21 and the connecting hole C32 are on the same horizontal straight line. The water flow which is staggered in height and is generated between the adjacent filters can be the diagonal line of the water flow passing through the filter tank, so that the effect of maximum travel of the flow is realized, and the maximum utilization of filter materials in the filter tank is ensured. In this embodiment, after the position of the water flow is determined, only four kinds of molds or other production processes are needed, including one water inlet tank 1, one water outlet tank 4, one extension tank B2 and one extension tank C3, so that several different requirements of the fish tank from short to long can be met.

As shown in fig. 13, in the third embodiment, the device further includes an extension groove C3, a connecting portion C31 is disposed on a left side wall of the extension groove C3, a connecting hole C32 is disposed on a right side wall of the extension groove C3, the connecting portion C31 has the same structure as the connecting portion B21, the connecting hole C32 has the same structure as the connecting hole B22 but different positions of respective center points, the respective center points of the connecting portion a12 and the connecting hole B22 are on the same horizontal line, and the respective center points of the connecting portion B21, the connecting hole C32, the connecting portion C31 and the connecting hole D43 are on the same horizontal line.

As shown in fig. 14, in the fourth embodiment, the device further includes an extension groove C3, a connecting portion C31 is disposed on a left side wall of the extension groove C3, a connecting hole C32 is disposed on a right side wall of the extension groove C3, the connecting portion C31 and the connecting portion B21 have the same structure but different positions of respective center points, the connecting hole C32 and the connecting hole B22 have the same structure, the center points of the connecting portion a12, the connecting hole B22, the connecting portion B21 and the connecting hole C32 are on the same horizontal line, and the center points of the connecting portion C31 and the connecting hole D43 are on the same horizontal line.

The four embodiments can be seen that the utility model can realize the change of the length and the water flow after combination by using three or four filter tank structures, and is flexible, efficient, convenient and quick. Of course, the structures of the four embodiments can be designed together, and the combination mode of geometric multiples can be generated after the four embodiments are summarized by adopting limited die quantity or production technology. For example, the water inlet tank 1 is provided with three types of connecting parts a (12) including high, medium and low, the water outlet tank 4 is provided with three types of connecting holes D43 including high, medium and low, the connecting part B21 and the connecting hole B22 of the long groove B2 are arranged on the same straight line and are provided with three types of connecting parts including high, medium and low, the long groove C3 is arranged with two types, namely, the connecting part C31 is at a high position, the connecting hole C32 is at a low position, and the connecting part C31 is at a low position, and the arrangement and combination or the change and the adjustment of the arrangement can be carried out according to actual needs, so that the requirements of various water flow modes and long and short arrangement can be sufficiently realized.

It should be noted that, since the above embodiments mainly change only in the positions of the connection portions and the connection holes, if the mold design processing or other production processes can keep the main structure unchanged and only adjust the positions thereof, the production cost can be greatly saved and the production efficiency can be improved.

In the embodiment, the filter further comprises a clamping groove 6, wherein the clamping groove 6 is arranged on the rear side wall of the filter groove to form a square groove with an opening at the lower end, and an inserting hole 61 is formed in the upper side surface of the clamping groove 6; still include inserted sheet 7, inserted sheet 7 downwardly extending forms and takes in 71, take in 71 inserts jack 61 adjusts the groove width of draw-in groove 6, namely, when the filter tank string is put and is being put at the fish bowl lateral wall, if produce the gap and can lead to the fact the position of filter tank to place to be incorrect or place unstable between draw-in groove 6 and the fish bowl lateral wall, be unfavorable for pleasing to the eye and realize the function of filter tank, take in 71 and can fill the gap between the two after inserting jack 61 to guarantee that the filter tank level is firm to place promptly, inserted sheet 7 can set up multiple model, namely, its take in 71 can be provided with a plurality of different thicknesses, in order to satisfy the not demand of equidimension of gap between draw-in groove 6 and the fish bowl lateral wall.

Preferably, the insert 7 extends downward to form two pins 71 that are symmetrical left and right, the width of each pin 71 is the same as the width of each slot 6, and each pin 71 is inserted into the insertion holes 61 of two adjacent filter slots to form a fastening connection. On the one hand, after the pins 71 are inserted into the insertion holes 61, the stability between the clamping groove 6 and the side wall of the fish tank can be adjusted, and on the other hand, the stability of the connection between the two pins 71 and the insertion holes 61 of the adjacent filter tanks can be enhanced.

In this embodiment, the device further includes an auxiliary member 030, a covering groove 0301 is disposed on a right side surface of the auxiliary member 030, the covering groove 0301 is covered with a head shape on a left side of the connecting portion a12, the auxiliary member 030 is further provided with a placement surface 0302 for placing the elastic ring 51, the elastic ring 51 falls off from the placement surface 0302 and enters the groove 123, and due to limitation of a size of the filter tank and a position of the connecting portion, it is difficult to fix the elastic ring 51 in the groove on the connecting portion by hand, and the auxiliary member 030 can provide convenience for fixing the elastic ring 51.

In this embodiment, still include roof groove 8, roof groove 8 below is provided with base 81, base 81 is fixed on the cell wall of intake groove 1 top, roof groove 8 diapire is provided with water inlet B83, water inlet B83 with water inlet A11 shape is the same and can supply inlet tube 040 to pass on same vertical straight line, roof groove 8 diapire still is provided with a plurality of holes of leaking 82, the hole of leaking 82 flows the water after filtering into intake groove 1. Because the roof tank 8 is arranged above the water inlet tank 1, the filter material in the roof tank is higher than the water level of the water body in the filter, so the roof tank is not soaked in the water body for a long time, and the roof tank is used as the filter material through which the polluted water body of the fish tank flows for the first time, and has the highest impurity content, so the probability of deterioration of impurities in the filter material and generation of harmful substances can be greatly reduced.

In this embodiment, the fish tank further includes a water outlet B42, the water outlet a41 is disposed at the upper end of the front sidewall of the water outlet tank 4, the water outlet B42 is disposed at the bottom wall of the water outlet tank 4, the highest point of the water outlet B42 is lower than the horizontal position of the water outlet a41, when filtered water needs to flow into the fish tank from the front end, the water outlet B42 is blocked, and correspondingly, when filtered water needs to flow into the fish tank from the bottom, the water outlet B42 is opened. Preferably, the water outlet A41 is rectangular, and an outflow platform is arranged at the outlet, so that a wider water flow can be formed when water flows out to generate a waterfall effect.

Preferably, the outer surfaces of the side walls of the two adjacent filter tanks are respectively provided with a limiting column 011 and a corresponding limiting hole 012, and the limiting columns 011 are inserted into the corresponding limiting holes 012 to form limiting, so that shaking can be prevented after limiting. The overflow port 020 is arranged at the upper edges of the left side wall, the right side wall and the front side wall of the filter tank, the overflow port 020 is lower than the top surface of the side wall of the filter tank, and the overflow port 020 is used for preventing water from flowing out of the fish tank and overflowing to the external environment when the water surface rises due to the blockage of the filter.

From the above description, it can be seen that the above embodiments achieve the following technical effects: the filter tank transversely sets up inlet channel, extension tank B, play basin, and the aquatic in the fish bowl gets into from water inlet A, filters the back through filter media in the filter tank, flows out from delivery port A, need not to immerse the aquatic, consequently can place the filter media of different materials in each filter tank, reach optimal filter effect, inlet channel, extension tank B, play basin pass through fastener fastening connection portion and connecting hole after, the combination of filter tank is accomplished, later stage no longer need to dismantle, the inslot filter media can directly take out, convenient to use, not only practiced thrift production and transportation space, also improved availability factor, promote product competitiveness.

The foregoing is merely exemplary embodiments of the present utility model and is not intended to limit the scope of the utility model, which is defined by the appended claims.

Claims (11)

1. The utility model provides a combination formula fish bowl filter vat, includes intake channel (1) and play basin (4), intake channel (1) diapire is provided with water inlet A (11), play basin (4) are provided with delivery port (A41), its characterized in that: the left side wall of the water inlet tank (1) is provided with a protruding connecting part A (12), the middle part of the connecting part A (12) is provided with a guide opening (121), the outer side surface of the connecting part A (12) is provided with a sleeve and surface (122), and the right side wall of the water outlet tank (4) is provided with a connecting hole D (43); the novel structure of the connecting device is characterized by further comprising an extension groove B (2), wherein the extension groove B (2) comprises a connecting part B (21) arranged on the left side wall and a connecting hole B (22) arranged on the right side wall, after the connecting part A (12) passes through the connecting hole B, the sleeve and the surface (122) are attached to the inner side surface of the connecting hole B (22), the connecting part B (21) and the connecting part A (12) are identical in structure, and the connecting hole D (43) and the connecting hole B (22) are identical in structure; the water inlet tank (1) and the water outlet tank (4) are sequentially fastened and connected from right to left by the fastener (5), and the fastener (5) is sleeved on the connecting part B (21) to fasten the connecting part B (21) and the connecting hole D (43).

2. A combination aquarium filter tank as defined in claim 1 wherein: the fastener (5) is an elastic ring (51), a groove (123) is further formed in the outer side face of the connecting portion A (12) on the left side of the sleeve and the face (122), the distance from the groove wall on the right side of the groove to the outer surface of the left side wall of the water inlet groove (1) is smaller than the thickness of the right side wall of the extended groove B (2), after the elastic ring (51) is fixed to the groove (123), the maximum distance between the outer side faces of the elastic ring (51) is larger than the maximum distance between the inner side faces of the connecting holes B (22).

3. A combination aquarium filter tank as defined in claim 2 wherein: the connecting part A (12), the connecting hole B (22), the connecting part B (21) and the connecting hole D (43) are respectively arranged on the same horizontal straight line, and the water inlet tank (1) and the water outlet tank (4) and one or more of the extension tanks B (2) can be freely combined to form fastening connection.

4. A combination aquarium filter tank as defined in claim 2 wherein: the novel connecting device is characterized by further comprising an extension groove C (3), wherein a connecting portion C (31) is arranged on the left side wall of the extension groove C (3), a connecting hole C (32) is arranged on the right side wall of the extension groove C (3), the connecting portion C (31) and the connecting portion B (21) are identical in structure and different in position of respective center points, the connecting hole C (32) and the connecting hole B (22) are identical in structure and different in position of respective center points, the connecting portion A (12), the connecting hole B (22) and the connecting portion C (31) and the connecting hole D (43) are in the same horizontal straight line, and the connecting portion B (21) and the connecting hole C (32) are in the same horizontal straight line.

5. A combination aquarium filter tank as defined in claim 2 wherein: still include extension groove C (3), extension groove C (3) left side wall is provided with connecting portion C (31), extension groove C (3) right side wall is provided with connecting hole C (32), connecting portion C (31) with connecting portion B (21) structure is the same, connecting hole C (32) with connecting hole B (22) structure is the same but the position of respective central point is different, connecting portion A (12) with connecting hole B (22) respective central point is on same horizontal straight line, connecting portion B (21) connecting hole C (32) connecting portion C (31) with connecting hole D (43) respective central point is on same horizontal straight line.

6. A combination aquarium filter tank as defined in claim 2 wherein: still include extension groove C (3), extension groove C (3) left side wall is provided with connecting portion C (31), extension groove C (3) right side wall is provided with connecting hole C (32), connecting portion C (31) with connecting portion B (21) structure is the same but the position of respective central point is different, connecting hole C (32) with connecting hole B (22) structure is the same, connecting portion A (12 connecting hole B (22) connecting portion B (21) with connecting hole C (32) respective central point is on same horizontal straight line, connecting portion C (31) with connecting hole D (43) respective central point is on same horizontal straight line.

7. A combination aquarium filter tank as defined in any one of claims 1 to 6 wherein: the filter further comprises a clamping groove (6), wherein the clamping groove (6) is arranged on the rear side wall of the filter groove to form a square groove with an opening at the lower end, and an inserting hole (61) is formed in the upper side surface of the clamping groove (6); the card slot further comprises an inserting sheet (7), wherein the inserting sheet (7) downwards extends to form a pin (71), and the pin (71) is inserted into the inserting hole (61) to adjust the slot width of the card slot (6).

8. A combination aquarium filter tank as defined in any one of claims 2 to 6 wherein: the novel elastic ring comprises a connecting part A (12), and is characterized by further comprising an auxiliary part (030), wherein a cover groove (0301) is formed in the right side face of the auxiliary part (030), the cover groove (0301) is covered with the shape of the left head of the connecting part A (12), a placing face (0302) is further arranged on the auxiliary part (030) and used for placing the elastic ring (51), and the elastic ring (51) falls off from the placing face (0302) and then enters the groove (123).

9. A combination aquarium filter tank as defined in any one of claims 1 to 6 wherein: still include roof groove (8), roof groove (8) below is provided with base (81), base (81) are fixed on intake groove (1) top cell wall, roof groove (8) diapire is provided with water inlet B (83), water inlet B (83) with water inlet A (11) shape is the same and on same vertical straight line, roof groove (8) diapire still is provided with a plurality of holes (82) that leak.

10. A combination aquarium filter tank as defined in any one of claims 1 to 6 wherein: the water outlet B (42) is arranged at the upper end of the front side wall of the water outlet tank (4), the water outlet B (42) is arranged at the bottom wall of the water outlet tank (4), and the highest point of the water outlet B (42) is lower than the horizontal position of the water outlet A (41).

11. A combination aquarium filter tank as defined in any one of claims 1 to 6 wherein: two filter tank lateral wall surfaces that are adjacent to each other are provided with spacing post (011) and spacing hole (012) that correspond respectively, spacing post (011) insert the correspondence spacing hole (012) form spacingly, lateral wall and preceding lateral wall upper edge all are provided with overflow mouth (020) about the filter tank, overflow mouth (020) are less than filter tank lateral wall top surface.

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