A double-filter strong suction filter

Abstract

The application discloses a double-filter strong-filtering type filter which comprises a shell and a plurality of filter materials, a plurality of filter material bins are arranged in the shell in an up-down distribution, adjacent filter material bins are communicated with each other, and the filter materials are arranged in the corresponding filter material bins; a strong-filtering bin is arranged at the lower part of the shell and is communicated with the lowermost filter material bin, and the first filter cotton is arranged in the strong-filtering bin; a double-head pump is fixed in the shell, the double-head pump is provided with a vertical first channel and a second channel, the lower end of the first channel is a first water inlet, the first water inlet is communicated with the outside, the upper end of the first channel is a first water outlet, the lower end of the second channel is a second water inlet, the second water inlet is arranged in the strong-filtering bin, and the upper end of the second channel is a second water outlet; a first water outlet element is fixed in the shell, the water inlet of the first water outlet element is communicated with the first water outlet, and the water outlet of the first water outlet element is arranged above the uppermost filter material bin; and the filter has the advantages of good filtering effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water filtration, in particular to a double-filter strong suction type filter. BACKGROUND

[0002] In recent years, with the continuous improvement of the quality of life, people's requirements for living environment are gradually increasing, and placing an ornamental fish tank in the room has become a new consumer demand of people. Because fish is secreting and excreting dirt every moment, harmful substances in the water are increasing at any time, and the quality of water directly affects the survival of fish, so it is necessary to rely on a filter to maintain the stability of the water quality.

[0003] The filter is a device for keeping the water in the fish tank clear and stable. The impurities in the water, fish excrement, fish secretions, leftover food, rotten leaves of aquatic plants and organic matter in the water are filtered out through the filter material in the filter, so as to adjust various indicators of the water and maintain the stability of the water quality in the aquarium, thereby creating a clean and beneficial water environment for the digestion of bacteria in the fish tank.

[0004] However, the existing common filter generally only has filter cotton or filter plate. When working, the water mixed with impurities is sucked into the shell from the water inlet under the suction of the fish tank submersible pump. After the filter plate or filter cotton filters once, the water flows back to the fish tank from the water outlet pipe, and the impurities are left at the bottom of the filter. This filtering method can only play a certain filtering role, and the filtering effect needs to be improved. SUMMARY

[0005] In order to solve the above problems in the prior art, the present application provides a double-filter strong suction type filter with good filtering effect,

[0006] The technical scheme adopted by the present application to solve the above technical problems is as follows: a double-filter strong suction type filter, comprising a shell, further comprising

[0007] A plurality of filter materials are arranged in a plurality of filter material bins distributed vertically in the shell, and the adjacent filter material bins are communicated with each other, and the filter materials are arranged in the corresponding filter material bins;

[0008] A strong filter bin is located in the lower part of the shell and is in communication with the lowermost filter material bin, and a first filter cotton is placed in the strong filter bin;

[0009] A double-head pump is fixed in the shell, the double-head pump has a first channel and a second channel vertically distributed, the lower end of the first channel is a first water inlet, the first water inlet is in communication with the outside, the upper end of the first channel is a first water outlet, the lower end of the second channel is a second water inlet, the second water inlet extends into the strong filter bin, and the upper end of the second channel is a second water outlet;

[0010] A first water outlet is fixed in the shell, and a water inlet of the first water outlet is communicated with the first water outlet, and a water outlet of the first water outlet is located above the uppermost filter material bin;

[0011] A second water outlet is arranged on the side wall of the upper part of the shell, and a water inlet of the second water outlet is communicated with the second water outlet.

[0012] Preferably, the shell is composed of a plurality of single modules and a cover, and the adjacent single modules are fixed by a connecting mechanism, and the cover is fixed on the uppermost single module.

[0013] Preferably, a horizontally distributed filter plate is connected in the cover, the second filter cotton is placed on the filter plate, a vertically distributed water outlet channel is further arranged in the cover, the water outlet channel is communicated with the first water outlet, the first water outlet is connected to the water outlet channel, the first water outlet is in a flat duckbill structure, and the water outlet of the first water outlet is located above the second filter cotton.

[0014] Preferably, a containing space for containing an electric heating rod is arranged on the shell, the containing space is arranged through up and down, and a overflow area communicated with the containing space is arranged on the side wall of the cover.

[0015] Preferably, a vertically distributed drainage channel is further arranged in the cover, a water inlet of the drainage channel is communicated with the second water outlet, a first drainage port and a second drainage port distributed in up and down are arranged on the side wall of the cover, the first drainage port and the second drainage port are respectively communicated with the drainage channel, the second water outlet has a rain shower cavity and an oxygen increasing cavity which are independent of each other, the rain shower cavity is communicated with the first drainage port, a plurality of rain shower holes communicated with the rain shower cavity are horizontally arranged on the second water outlet, the oxygen increasing cavity is communicated with the second drainage port, an oxygen increasing pipe communicated with the oxygen increasing cavity is vertically arranged on the second water outlet, and an adjusting member for adjusting water outlet quantity of the rain shower cavity and the oxygen increasing cavity is further arranged in the drainage channel.

[0016] Preferably, the adjusting member comprises an adjusting knob and an adjusting shaft, the adjusting knob is fixed on the upper end of the adjusting shaft, the adjusting shaft is arranged in the drainage channel, the adjusting shaft has a water supply cavity with an open lower end, a first opening and a second opening distributed in up and down are further arranged on the side wall of the adjusting shaft, the first opening and the second opening are arranged staggered with each other, the first opening corresponds to the first drainage port, the second opening corresponds to the second drainage port, when the first opening completely faces the first drainage port, the adjusting shaft closes the second drainage port, and when the second opening completely faces the second drainage port, the adjusting shaft closes the first drainage port.

[0017] Preferably, a filter element is further included, which comprises a filter head and a telescopic tube, the lower end of the telescopic tube being connected with the filter head, the upper end of the telescopic tube being inserted into the first water inlet, and the telescopic tube being in interference fit with the first water inlet.

[0018] Preferably, a fixing mechanism for cooperating with the angle position of the fish tank is further arranged on the shell, the fixing mechanism comprising two fixing units arranged on the side wall of the shell, the upper surface of the second filter cotton being higher than the liquid surface when the fixing units are connected with the fish tank.

[0019] Preferably, each of the fixing units comprises a clamping plate and a locking plate, the locking plate being horizontally fixed on the outer side wall of the shell, the second filter cotton being arranged higher than the locking plate, a plurality of sawteeth being arranged on the locking plate at intervals, a locking space being formed between adjacent sawteeth, a horizontal through extending cavity being arranged in the clamping plate, an elastic buckle being arranged on the upper end of the clamping plate, a vertical plate being fixed on the lower end of the clamping plate and extending downward, the lower end of the clamping plate being tightly attached to the upper edge of the fish tank, the vertical plate being tightly attached to the outer side wall of the fish tank, the locking plate being inserted into the extending cavity, and the elastic buckle cooperating with the locking space.

[0020] Preferably, a rubber damping element for contacting the inner wall of the fish tank is arranged on the outer side wall of the shell.

[0021] Compared with the prior art, the advantages of the present application are that: the plurality of filter material bins are arranged for accommodating a plurality of filter materials, thereby greatly improving the filtering effect of the filter, the filter materials are biochemical filter materials, and biochemical filtration can be performed, so that the water flowing to the strong filter bin is purified; the first filter cotton with large density is placed in the strong filter bin, and the water is not easy to pass through. Therefore, a certain vacuum environment is formed under water at this position, the double-head pump is used to forcibly extract water flow through the first filter cotton, the purpose of forced filtration is achieved, and the water quality is obviously improved, and finally the water filtered for multiple times flows to the second water outlet element through the second channel, and is supplied to the fish tank. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of the present application Figure One ;

[0023] Figure 2 is a schematic diagram of the three-dimensional structure of the present application Figure Two ;

[0024] Figure 3 is a schematic diagram of the three-dimensional structure of the present application in use

[0025] Figure 4 is a sectional view of the present application

[0026] Figure 5 It is a perspective view of the internal structure of the application;

[0027] Figure 6 It is a perspective view of the cover of the application;

[0028] Figure 7 It is a perspective view of the second water outlet of the application;

[0029] Figure 8 It is a perspective view of the adjusting member of the application;

[0030] Figure 9 It is a perspective view of the cover plate of the application. Embodiment

[0031] The application will be further described in detail below in combination with the drawings and embodiments, but not as a limitation to the application.

[0032] Embodiment one: as shown in the figure, a double-filter strong pumping filter, comprising a shell 1, further comprising

[0033] A plurality of filter materials 21, a plurality of filter material bins 2 distributed vertically are arranged in the shell 1, the adjacent filter material bins 2 are communicated with each other, and the filter material 21 is arranged in the corresponding filter material bin 2;

[0034] A strong filter bin 3 is located in the lower part of the shell 1 and is communicated with the lowermost filter material bin 2, and the first filter cotton 31 is placed in the strong filter bin 3;

[0035] A double-head pump 4 is fixed in the shell 1, the double-head pump 4 has a vertical first channel 41 and a second channel 42, the lower end of the first channel 41 is a first water inlet 43, the first water inlet 43 is communicated with the outside, the upper end of the first channel 41 is a first water outlet 44, the lower end of the second channel 42 is a second water inlet 45, the second water inlet 45 extends into the strong filter bin 3, and the upper end of the second channel 42 is a second water outlet 46;

[0036] A first water outlet 5 is fixed in the shell 1, the water inlet of the first water outlet 5 is communicated with the first water outlet 44, and the water outlet of the first water outlet 5 is located above the uppermost filter material bin 2;

[0037] A second water outlet 6 is arranged on the side wall of the upper part of the shell 1, and the water inlet of the second water outlet 6 is communicated with the second water outlet 46.

[0038] In the above structure, the multiple filter material bins 2 are arranged to accommodate multiple filter materials 21, thereby greatly improving the filtering effect of the filter, the filter materials 21 are biochemical filter materials 21, and biochemical filtration can be performed, so that the water flowing to the strong filter bin 3 is purified; the first filter cotton 31 with large density is placed in the strong filter bin 3, and water is not easy to pass through. Therefore, a certain vacuum environment is formed under water at this position, and the double-head pump 4 forcibly extracts water flow through the first filter cotton 31, so as to achieve the purpose of forced filtration, so that the water quality is obviously improved, and finally the water filtered for multiple times flows to the second water outlet 6 through the second channel 42, and is supplied to the fish tank.

[0039] The water path process of the filter is that when the double-head pump 4 is started, the water in the fish tank is extracted by the first water inlet 43, flows out from the first water outlet 5 after passing through the second channel 42 from bottom to top, and then flows to the strong filter bin 3 after passing through the multiple filter material bins 2 from top to bottom. The second channel 42 forcibly extracts water through the first filter cotton 31 by the double-head pump 4, so as to achieve the purpose of forced filtration, and finally flows to the second water outlet 6 from bottom to top, and returns to the fish tank.

[0040] In the embodiment, the shell 1 is composed of multiple single modules 11 and a cover 12, and the upper and lower adjacent single modules 11 are fixed by a connecting mechanism, and the cover 12 is fixed on the uppermost single module 11.

[0041] In the above structure, the shell 1 is modularly arranged, and the main body is composed of multiple single modules 11 which are connected from top to bottom, so that the shell 1 can be freely assembled to adapt to different water depths, the cover 12 is fixed on the uppermost single module 11, thereby forming a complete main body, and the main body of the double-head pump 4 is located in the cover 12.

[0042] In order to realize quick disassembly and assembly, a connecting mechanism is arranged, which includes an elastic lock buckle fixed on the lower part of the single module 11 and matched with a clamping groove on the next single module 11, so as to realize quick disassembly and assembly, and the connection between the upper and lower adjacent single modules 11 is relatively reliable and not easy to separate without external force.

[0043] In the embodiment, the cover 12 is connected with a horizontally distributed filter plate 121, the second filter cotton 122 is placed on the filter plate 121, the cover 12 is further provided with a vertically distributed water outlet channel 123, the water outlet channel 123 is connected with the first water inlet 44, the first water outlet 5 is connected with the water outlet channel 123, and the first water outlet 5 is in the form of a flat duckbill structure, and the water outlet of the first water outlet 5 is located above the second filter cotton 122.

[0044] In the above structure, the second filter cotton 122 placed on the filter plate 121 is used for preliminary filtering of water quality, and when the water sucked by the first channel 41 of the double-head pump 4 is drawn upward from bottom to top, it is discharged by the first water outlet 5 and then falls on the second filter cotton 122 and flows to the strong filter bin 3 from top to bottom. The flat duckbill structure of the first water outlet 5 can expand the water flow area, avoid too concentrated water flow, and facilitate uniform filtering of water.

[0045] In the embodiment, the housing 1 is provided with a containing space 125 for containing an electric heating rod, the containing space 125 is throughly arranged from top to bottom, and the overflow area 124 communicated with the containing space 125 is arranged on the side wall of the cover 12.

[0046] In the structure, the containing space 125 is arranged for containing the electric heating rod, so that the overall structure is relatively compact. The containing space 125 is throughly arranged from top to bottom, and the overflow area 124 arranged on the cover 12 is used for overflow when there is too much water in the cover 12. The water directly flows from the overflow area 124 to the containing space 125 and then flows back to the fish tank.

[0047] In the embodiment, the cover 12 is further provided with a vertical drainage channel 126, the water inlet of the drainage channel 126 is communicated with the second water outlet 46, the side wall of the cover 12 is provided with a first drainage port 127 and a second drainage port 128 arranged vertically, the first drainage port 127 and the second drainage port 128 are respectively communicated with the drainage channel 126, the second water outlet 6 has a rain shower cavity 61 and an oxygenation cavity 62 which are independent of each other, the rain shower cavity 61 is communicated with the first drainage port 127, the second water outlet 6 is horizontally arranged with a plurality of rain shower holes 63 communicated with the rain shower cavity 61, the oxygenation cavity is communicated with the second drainage port 128, the second water outlet 6 is vertically provided with an oxygenation pipe 64 communicated with the oxygenation cavity, and the drainage channel 126 is further provided with an adjusting member 7 for adjusting the water discharge of the rain shower cavity 61 and the oxygenation cavity 62.

[0048] In the above structure, the drainage channel 126 is communicated with the second water outlet 46, when the filtered water flows out of the drainage channel 126, enters the first drainage port 127 or the second drainage port 128, and then flows out of the rain shower holes 63 through the rain shower cavity 61, the overall water flow is in a scattered state, thereby slowing down the impact of the water flow on the fish or landscape in the tank; when the water enters the second drainage port 128, then flows out of the water outlet of the second water outlet 6 through the oxygenation cavity 62, the oxygenation pipe 64 can quickly achieve the purpose of oxygenation in water.

[0049] The adjusting member 7 is arranged for adjusting the water discharge of the rain shower cavity 61 and the oxygenation cavity 62. The device has three modes, i.e. completely in the rain shower mode, completely in the oxygenation mode, or partially in the rain shower mode and partially in the oxygenation mode, thereby meeting different use requirements.

[0050] In the embodiment, the adjusting member 7 comprises an adjusting knob 71 and an adjusting shaft 72, the adjusting knob 71 is fixed on the upper end of the adjusting shaft 72, the adjusting shaft 72 extends into the drainage channel 126, and the adjusting shaft 72 has a water cavity 73 with an open lower end, and the first opening 74 and the second opening 75 are arranged on the side wall of the adjusting shaft 72 in an up-down interval, the first opening 74 and the second opening 75 are arranged staggered with each other, the first opening 74 corresponds to the first drainage port 127, and the second opening 75 corresponds to the second drainage port 128, when the first opening 74 is completely opposite to the first drainage port 127, the adjusting shaft 72 closes the second drainage port 128; when the second opening 75 is completely opposite to the second drainage port 128, the adjusting shaft 72 closes the first drainage port 127.

[0051] In the embodiment, the adjusting member 7 extends into the drainage channel 126, and the adjusting shaft 72 is rotated by rotating the adjusting knob 71, the water cavity 73 of the adjusting shaft 72 is communicated with the drainage channel 126, the first opening 74 and the second opening 75 are arranged on the side wall of the adjusting shaft 72, and the first opening 74 and the second opening 75 are arranged staggered with each other, when the first opening 74 is completely opposite to the first drainage port 127, the second opening 75 is completely staggered with the second drainage port 128, the adjusting shaft 72 closes the second drainage port 128, and the water from the second channel 42 flows to the rain shower cavity 61; when the second opening 75 is completely opposite to the second drainage port 128, the first opening 74 is completely staggered with the first drainage port 127, the adjusting shaft 72 closes the first drainage port 127, and the water from the second channel 42 flows to the oxygenation cavity 62; when the first opening 74 is partially opposite to the first drainage port 127, the second opening 75 is also partially opposite to the second drainage port 128, so that part of the water flows out of the rain shower cavity 61, and part of the water flows out of the oxygenation cavity 62, which meets different use requirements.

[0052] Embodiment three: as shown in the figure, different from embodiment two, it further comprises a filter member 8, the filter member 8 comprises a filter head 81 and an elastic tube 82, the lower end of the elastic tube 82 is communicated with the filter head 81, the upper end of the elastic tube 82 is inserted into the first water inlet 43, and the elastic tube 82 is in interference fit with the first water inlet 43.

[0053] In the above structure, the filter member 8 can filter large impurities in the fish tank, and avoid that the water grass and the like enter the first channel 41, the upper end of the elastic tube 82 is inserted into the first water inlet 43, and the elastic tube 82 is in interference fit with the first water inlet 43, so that the extension length of the elastic tube 82 in the first channel 41 can be adjusted, and the water depth position of the filter head 81 is adjusted, which is simple in structure and practical.

[0054] In the embodiment, the shell 1 is further provided with a fixing mechanism for cooperating with the corner position of the fish tank. The fixing mechanism comprises two fixing units 9 arranged on the side wall of the shell 1. When the fixing units 9 are connected with the fish tank, the upper surface of the second filter cotton 122 is higher than the liquid level.

[0055] In the above structure, the two fixing units 9 are arranged on the outer side wall of the shell 1, which is used for cooperating with the corner position of the fish tank, so as to achieve the purpose of being connected with the fish tank. When the fixing units 9 are connected with the fish tank, the second filter cotton 122 is higher than the liquid level, thereby achieving the purpose of dry and wet separation, and bacteria can be avoided due to long-term soaking of residual excrement in the fish tank in water.

[0056] In the above structure, the two fixing units 9 are arranged on the outer side wall of the shell 1, which is used for cooperating with the corner position of the fish tank, so as to achieve the purpose of being connected with the fish tank. When the fixing units 9 are connected with the fish tank, the second filter cotton 122 is higher than the liquid level, thereby achieving the purpose of dry and wet separation, and bacteria can be avoided due to long-term soaking of residual excrement in the fish tank in water.

[0057] In the above structure, the two fixing units 9 are arranged on the outer side wall of the shell 1, which is used for cooperating with the corner position of the fish tank, so as to achieve the purpose of being connected with the fish tank. When the fixing units 9 are connected with the fish tank, the second filter cotton 122 is higher than the liquid level, thereby achieving the purpose of dry and wet separation, and bacteria can be avoided due to long-term soaking of residual excrement in the fish tank in water.

[0058] In the above structure, the two fixing units 9 are arranged on the outer side wall of the shell 1, which is used for cooperating with the corner position of the fish tank, so as to achieve the purpose of being connected with the fish tank. When the fixing units 9 are connected with the fish tank, the second filter cotton 122 is higher than the liquid level, thereby achieving the purpose of dry and wet separation, and bacteria can be avoided due to long-term soaking of residual excrement in the fish tank in water.

[0059] In the above structure, the two fixing units 9 are arranged on the outer side wall of the shell 1, which is used for cooperating with the corner position of the fish tank, so as to achieve the purpose of being connected with the fish tank. When the fixing units 9 are connected with the fish tank, the second filter cotton 122 is higher than the liquid level, thereby achieving the purpose of dry and wet separation, and bacteria can be avoided due to long-term soaking of residual excrement in the fish tank in water.

[0060] It is to be noted that the above merely describes preferred embodiments of the present application, and is not intended to limit the patent protection scope of the present application. The present application can also be improved in material and structure for the configuration of various components described above, or replaced by technical equivalents. Therefore, equivalent structural changes made in accordance with the content of the specification and drawings, or directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A dual filter, positive displacement filter comprising a housing, characterized by: Also include A plurality of filter materials, a plurality of filter material bins are arranged in the shell, the upper and lower adjacent filter material bins are communicated with each other, and the filter materials are arranged in the corresponding filter material bins; A strong filter bin is located in the lower part of the shell and is communicated with the lowermost filter material bin, and a first filter cotton is placed in the strong filter bin; A double-head pump is fixed in the shell, the double-head pump has a vertical first channel and a second channel, the lower end of the first channel is a first water inlet, the first water inlet is communicated with the outside, the upper end of the first channel is a first water outlet, the lower end of the second channel is a second water inlet, the second water inlet extends into the strong filter bin, and the upper end of the second channel is a second water outlet; A first water outlet is fixed in the shell, the water inlet of the first water outlet is communicated with the first water outlet, and the water outlet of the first water outlet is located above the uppermost filter material bin; A second water outlet is arranged on the side wall of the upper part of the shell, and the water inlet of the second water outlet is communicated with the second water outlet; The shell is composed of a plurality of single modules and a cover, and the upper and lower adjacent single modules are fixed by a connecting mechanism, and the cover is fixed on the uppermost single module; The cover is also provided with a vertical drainage channel, the water inlet of the drainage channel is communicated with the second water outlet, the side wall of the cover is provided with a first drainage port and a second drainage port arranged in a vertical manner, the first drainage port and the second drainage port are respectively communicated with the drainage channel, the second water outlet has a rain shower cavity and an oxygen increasing cavity which are independent of each other, the rain shower cavity is communicated with the first drainage port, a plurality of rain shower holes which are communicated with the rain shower cavity are horizontally arranged on the second water outlet, the oxygen increasing cavity is communicated with the second drainage port, an oxygen increasing pipe which is communicated with the oxygen increasing cavity is vertically arranged on the second water outlet, and an adjusting member for adjusting the water output of the rain shower cavity and the oxygen increasing cavity is arranged in the drainage channel.

2. A dual filter, positive displacement filter according to claim 1, wherein: The cover is connected with a horizontally arranged filter plate, the second filter cotton is placed on the filter plate, the cover is also provided with a vertical water outlet channel, the water outlet channel is communicated with the first water outlet, the first water outlet is connected to the water outlet channel, and the first water outlet has a flat duckbill structure, and the water outlet of the first water outlet is located above the second filter cotton.

3. A dual filter, positive displacement filter according to claim 1, wherein: The shell is provided with a containing space for containing an electric heating rod, the containing space is arranged in a vertical manner, and the side wall of the cover is provided with an overflow area which is communicated with the containing space.

4. A dual filter, positive displacement filter according to claim 1, wherein: The adjusting member comprises an adjusting knob and an adjusting shaft, the adjusting knob is fixed on the upper end of the adjusting shaft, the adjusting shaft extends into the drainage channel, the adjusting shaft has a water supply cavity with an open lower end, the side wall of the adjusting shaft is further provided with a first opening and a second opening which are spaced apart from each other, the first opening corresponds to the first drainage port, the second opening corresponds to the second drainage port, when the first opening is completely opposite to the first drainage port, the adjusting shaft closes the second drainage port, when the second opening is completely opposite to the second drainage port, the adjusting shaft closes the first drainage port.

5. A dual filter, positive displacement filter according to claim 1, wherein: The filter member comprises a filter head and an elastic tube, the lower end of the elastic tube is connected with the filter head, the upper end of the elastic tube is inserted into the first water inlet, and the elastic tube is in interference fit with the first water inlet.

6. A dual filter, positive displacement filter according to claim 2, wherein: The shell is further provided with a fixing mechanism for cooperating with the corner position of the fish tank, the fixing mechanism comprises two fixing units arranged on the side wall of the shell, when the fixing units are connected with the fish tank, the upper surface of the second filter cotton is higher than the liquid level.

7. A dual filter, positive displacement filter according to claim 6, wherein: Each fixing unit comprises a clamping plate and a locking plate, the locking plate is horizontally fixed on the outer side wall of the shell, the second filter cotton is arranged higher than the locking plate, a plurality of sawteeth are arranged on the locking plate, a locking space is formed between adjacent sawteeth, a horizontal through extending cavity is arranged in the clamping plate, an elastic buckle is arranged on the upper end of the clamping plate, a vertical plate is fixedly arranged on the lower end of the clamping plate, the lower end of the clamping plate is tightly attached to the upper edge of the fish tank, the vertical plate is tightly attached to the outer side wall of the fish tank, the locking plate is inserted into the extending cavity, and the elastic buckle cooperates with the locking space.

8. A dual filter, positive displacement filter according to claim 1, wherein: The outer side wall of the shell is provided with a rubber damping member for contacting the inner wall of the fish tank.

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