Blocking type constant-temperature water-change-free mini fish tank

Abstract

The utility model belongs to the technical field of fish tank filtration, and particularly relates to a blocking type constant-temperature water-change-free mini fish tank, which comprises a tank body, wherein a base is fixed at the lower end in the tank body; a connecting bin is arranged in the middle of the top end of the base. The connecting bin is connected with the base through the two connecting assemblies. A biochemical filtering bin is arranged on the inner side of the connecting bin; cover plates are arranged at the top ends of the connecting bins; and the cover plate is connected with the connecting bin through an inserting assembly. Through the structural design of the multi-surface spiral filter screen, substances such as fish manure and residual feed can be slowly decomposed into ultra-small fragments under the impact of water flow, and the ultra-small fragments are used for providing nutrients for nitrifying bacteria; and the sheet structure with the width of more than 1mm greatly increases the attachment area of nitrifying bacteria, and more nitrifying bacteria can be cultivated to achieve the effect of avoiding water change, so that the tedious step of water change is reduced, and the practicability of the device is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fish tank filtration technical field, specifically is the blocking type constant temperature water change free mini fish tank. BACKGROUND

[0002] Fish tank is also called aquarium or water tank, is a container for observation and special breeding of aquatic plants and animals, is an animal feeding area, usually at least one side is transparent glass and high strength plastic.

[0003] The existing fish tank mostly adopts three pump bodies of circulating water pump, oxygenation pump and flushing pump to work cooperatively and cooperate with filter layer to guarantee the water quality of circulating water, and the circulating water pump pumps the filtered circulating water into the main cylinder during work, the oxygenation pump continuously works to inject oxygen into the circulating water in the main cylinder, and since the circulating water in the filter tank lacks oxygen content, the corresponding bacteria needs to be continuously added into the filter tank.

[0004] The inside of the small water circulation ecological fish tank needs a certain amount of nitrifying bacteria to digest and absorb the fish feces in the fish tank to achieve the effect of purifying water quality, but the filter device in the current fish tank does not have the condition for nitrifying bacteria to survive and reproduce, so that the user still needs to replace the water regularly, which increases the complexity, therefore, the blocking type constant temperature water change free mini fish tank is proposed for the above problems. UTILITY MODEL CONTENTS

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art, the utility model provides a blocking type constant temperature water change free mini fish tank.

[0006] The utility model discloses a blocking type constant temperature water change free mini fish tank, which comprises a cylinder body, a base is fixed to the lower end of the cylinder body, a connecting bin is arranged at the middle position of the top end of the base, the connecting bin is connected with the base through two groups of connecting assemblies, a biochemical filter bin is arranged on the inner side of the connecting bin, a cover plate is arranged at the top end of the connecting bin, the cover plate is connected with the connecting bin through a plug-in assembly, a multi-surface spiral filter screen is fixed to the inner side of the biochemical filter bin, the multi-surface spiral filter screen is a multi-surface 3D spiral woven, and a water outlet hole is formed in one end of the connecting bin.

[0007] Preferably, the connecting assembly comprises two connecting blocks; the two connecting blocks are symmetrically arranged at positions corresponding to the ends of the connecting bin inside the base; the connecting bin is provided with connecting grooves at positions corresponding to the connecting blocks; the connecting blocks are connected with the connecting bin through the connecting grooves; the connecting blocks are slidingly connected with the base; one end of each connecting block away from the connecting bin is fixed with a moving rod; the moving rods are slidingly connected with the base; the top end of one end of each moving rod away from the connecting block is fixed with a transmission rack; a transmission rod is rotatably connected with the base at a position above the transmission racks; one end of the transmission rod corresponding to the transmission rack is fixed with a drive gear; the drive gear is meshingly connected with the transmission rack; the base is provided with a drive assembly at a position corresponding to the transmission rod.

[0008] Preferably, the drive assembly comprises a connecting plate; the connecting plate is arranged at a position between the two drive gears inside the base; the connecting plate is slidingly connected with the base; the lower end of each end of the connecting plate is fixed with a moving frame; one end of each moving frame close to the transmission rod is fixed with a drive gear; one end of the transmission rod corresponding to the drive gear is fixed with a transmission gear; the transmission gear is meshingly connected with the drive gear; the moving frame is slidingly connected with the base.

[0009] Preferably, the top end of each end of the connecting plate is fixed with a connecting rod; the top end of each connecting rod extends to the outside of the top end of the base; the top end of each connecting rod is fixed with a pull handle; a contraction spring is sleeved with the outside of one end of each connecting rod close to the connecting plate; one end of the contraction spring is fixedly connected with the connecting plate; the other end of the contraction spring is fixedly connected with the base.

[0010] Preferably, the plug-in assembly comprises two plug-in rods; the two plug-in rods are arranged at positions inside both ends of the cover plate; the plug-in rods are slidingly connected with the cover plate; one end of each plug-in rod close to the connecting bin is fixed with a plug-in block; the plug-in block is slidingly connected with the cover plate; the connecting bin is provided with plug-in grooves at positions corresponding to the plug-in blocks; the plug-in blocks are plug-in connected with the connecting bin through the plug-in grooves; a telescopic spring is sleeved with the outside of one end of each plug-in rod close to the plug-in block; one end of the telescopic spring is fixedly connected with the plug-in block; the other end of the telescopic spring is fixedly connected with the cover plate.

[0011] Preferably, one end of each plug-in rod away from the plug-in block extends to the inside of the cover plate; the one end of each plug-in rod away from the plug-in block is fixed with a pull ball.

[0012] Preferably, the inside of the base is provided with an intelligent adjustable temperature controller; one end of the cylinder body inside is fixed with a constant temperature heating wire; the constant temperature heating wire is electrically connected with the intelligent adjustable temperature controller.

[0013] The utility model discloses a beneficial effect:

[0014] The utility model provides a block type constant temperature water change free mini fish tank, through the structural design of multi -sided spiral filter screen, fish feces and these materials such as remnant bait can be slowly broken down under the impact of water flow and form super small fragments to provide nitrobacteria with nourishment, and the sheet structure of more than 1 millimeter wide greatly improves the adhesion area of nitrobacteria and can cultivate more nitrobacteria to achieve the effect of water change free, thereby reducing the cumbersome steps of water change required, and improving the practicality of the device.

[0015] The utility model provides a block type constant temperature water change free mini fish tank, through the cooperation structural design of plug -in block, plug -in rod and telescopic spring, can separate the cover plate and the connecting storehouse conveniently and quickly, thereby conveniently taking out the biochemical filter storehouse and multi -sided spiral filter screen from the inside of connecting storehouse, and conveniently clean multi -sided spiral filter screen. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and serve to explain the utility model, and do not constitute an improper limitation on the utility model. In the drawings:

[0017] Figure 1 It is the perspective view of the utility model;

[0018] Figure 2 It is the perspective view of biochemical filter storehouse and multi -sided spiral filter screen in the utility model;

[0019] Figure 3 It is the connecting structure perspective view of connecting storehouse and base in the utility model;

[0020] Figure 4 It is the perspective view of connecting block and moving rod in the utility model;

[0021] Figure 5 It is the perspective view of connecting assembly in the utility model;

[0022] Figure 6 It is the perspective view of plug -in assembly in the utility model.

[0023] Legend:

[0024] 1, cylinder; 2, base; 3, constant temperature heating wire; 4, connecting bin; 5, cover plate; 6, biochemical filter bin; 7, multi-surface spiral filter screen; 8, connecting groove; 9, water outlet hole; 10, connecting block; 11, moving rod; 12, transmission rack; 13, drive gear; 14, pull handle; 15, transmission rod; 16, transmission gear; 17, moving frame; 18, drive rack; 19, connecting plate; 20, connecting rod; 21, retracting spring; 22, plug-in block; 23, plug-in rod; 24, telescopic spring; 25, pull ball; 26, plug-in groove. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] Specific embodiments are given below.

[0027] Please refer to Figures 1-6The utility model provides a block type constant temperature water change free mini fish tank, including jar body 1: the lower extreme fixed with base 2 in jar body 1 inside, the intermediate position of base 2 top is provided with connecting storehouse 4, connecting storehouse 4 is connected with base 2 through two groups of connecting components, the inboard of connecting storehouse 4 is provided with biochemical filter storehouse 6, the top of connecting storehouse 4 is provided with cover 5, cover 5 is connected with connecting storehouse 4 through the plug -in component, the inboard fixed with the polyhedral spiral filter screen 7 of biochemical filter storehouse 6, the polyhedral spiral filter screen 7 is polyhedral 3D spiral shape weaving, one end of connecting storehouse 4 is provided with water outlet 9. When working, the polyhedral spiral filter screen 7 is polyhedral spiral 3D body structure, can form the cultivation bed of nitrobacteria by the automatic blockage broken of fish feces and the like through the self -suction water suction into the polyhedral spiral filter screen 7 inside, the width of every layer of polyhedron is 4 millimeters and is used as the adhesion of nitrobacteria, utilizes the mode of self -suction or submersible pump, because the polyhedron hole is every hole and is cyclically staggered, and the water pump water suction will suck fish feces and the like into the polyhedral spiral filter screen 7, and will not be sucked away, and the broken is formed by the cyclic impact in every hole, and the decomposable material such as fish feces and the like is forcibly sucked into the polyhedral spiral filter screen 7, and the structure of polyhedron is 1 millimeter wave -like sheet material in every layer and is accumulated from multiple directions to cross -over, and the water flow can pass well, but the material more than 1 millimeter can be isolated in the storehouse, these materials are slowly decomposed to form super -small fragments under the impact of water flow to provide the nutrient for nitrobacteria, and the sheet structure more than 1 millimeter wide greatly improves the adhesion area of nitrobacteria to cultivate more nitrobacteria to achieve the effect of water change free, this step passes through the structural design of polyhedral spiral filter screen 7, so that the material such as fish feces and the like can be slowly decomposed to form super -small fragments under the impact of water flow to provide the nutrient for nitrobacteria, and the sheet structure more than 1 millimeter wide greatly improves the adhesion area of nitrobacteria to cultivate more nitrobacteria to achieve the effect of water change free, thereby reduce the cumbersome step of water change, improve the practicability of device,

[0028] Further, as Figures 3-5As shown, the connecting assembly comprises two connecting blocks 10; the two connecting blocks 10 are symmetrically arranged at the positions corresponding to the ends of the connecting bin 4 on the inner side of the base 2; the connecting bin 4 is provided with a connecting groove 8 at the position corresponding to the connecting block 10; the connecting block 10 is connected with the connecting bin 4 through the connecting groove 8; the connecting block 10 is slidingly connected with the base 2; one end of the connecting block 10 away from the connecting bin 4 is fixed with a moving rod 11; the moving rod 11 is slidingly connected with the base 2; the top end of the other end of the moving rod 11 away from the connecting block 10 is fixed with a transmission rack 12; the inner side of the base 2 and above the transmission rack 12 is rotatably connected with a transmission rod 15; one end of the transmission rod 15 corresponding to the transmission rack 12 is fixed with a driving gear 13; the driving gear 13 is meshingly connected with the transmission rack 12; the inner side of the base 2 and corresponding to the transmission rod 15 is provided with a driving assembly. When the connecting bin 4 is installed on the inner side of the base 2, the connecting bin 4 moves downward, and when the connecting bin 4 moves to contact the connecting block 10, the connecting bin 4 extrudes the connecting block 10, so that the connecting block 10 moves away from the connecting bin 4, and when the connecting bin 4 moves to the position corresponding to the connecting groove 8 and the connecting block 10, the transmission rod 15 rotates under the action of the driving assembly, and when the transmission rod 15 rotates, the driving gear 13 rotates, and the driving gear 13 drives the moving rod 11 fixed with the transmission rack 12 to move, so that the moving rod 11 drives the connecting block 10 to move towards the connecting groove 8, and when the connecting groove 8 moves to the inner side of the connecting block 10, the connecting groove 8 limits the connecting bin 4, and the installation of the connecting bin 4 is completed. This step facilitates the operator to conveniently and quickly install the connecting bin 4, saves the installation time, and improves the working efficiency of the installation of the connecting bin 4.

[0029] Further, as shown in the figure, Figure 5 The driving assembly comprises a connecting plate 19; the connecting plate 19 is arranged on the inner side of the base 2 and between the two driving gears 13; the connecting plate 19 is slidingly connected with the base 2; the lower ends of the two ends of the connecting plate 19 are fixed with moving frames 17; one end of the moving frame 17 close to the transmission rod 15 is fixed with a driving rack 18; one end of the transmission rod 15 corresponding to the driving rack 18 is fixed with a transmission gear 16; the transmission gear 16 is meshingly connected with the driving rack 18; the moving frame 17 is slidingly connected with the base 2. When the connecting plate 19 moves downward, the moving frame 17 moves, and when the moving frame 17 rotates, the transmission gear 16 meshingly connected with the driving rack 18 rotates, and when the transmission gear 16 rotates, the transmission rod 15 fixed with the transmission gear 16 rotates. This step facilitates the transmission rod 15 to rotate through the driving rack 18 and the transmission gear 16.

[0030] As shown in the figure, Figure 5As shown, the two ends of the top end of the connecting plate 19 are fixed with connecting rods 20; the top ends of the two connecting rods 20 extend to the outside of the top end of the base 2; the top ends of the two connecting rods 20 are fixed with pull handles 14; the outside of the end of the connecting rod 20 close to the connecting plate 19 is sleeved with a contraction spring 21; one end of the contraction spring 21 is fixedly connected with the connecting plate 19; the other end of the contraction spring 21 is fixedly connected with the base 2. When the connecting bin 4 needs to be taken out, first pull the pull handle 14 upwards, the pull handle 14 drives the connecting plate 19 to move upwards through the connecting rod 20 fixedly connected therewith, when the connecting plate 19 moves, the driving rack 18 is also moved, this step facilitates the movement of the connecting plate 19 by pulling the pull handle 14, and then the connecting block 10 can be conveniently moved to be separated from the connecting groove 8, so that the connecting bin 4 can be conveniently taken out from the inside of the top end of the base 2, and the disassembly efficiency of the connecting bin 4 is improved.

[0031] As shown, Figure 6 The plug-in assembly comprises two plug-in rods 23; the two plug-in rods 23 are arranged at the inside positions of the two ends of the cover plate 5 respectively; the plug-in rod 23 is in sliding connection with the cover plate 5; the end of the plug-in rod 23 close to the connecting bin 4 is fixed with a plug-in block 22; the plug-in block 22 is in sliding connection with the cover plate 5; the connecting bin 4 is provided with a plug-in groove 26 at a position corresponding to the plug-in block 22; the plug-in block 22 is in plug-in connection with the connecting bin 4 through the plug-in groove 26; the outside of the end of the plug-in rod 23 close to the plug-in block 22 is sleeved with a telescopic spring 24; one end of the telescopic spring 24 is fixedly connected with the plug-in block 22; the other end of the telescopic spring 24 is fixedly connected with the cover plate 5. When the plug-in rod 23 moves, the plug-in block 22 fixedly connected therewith also moves, when the plug-in block 22 moves to be separated from the plug-in groove 26, the plug-in block 22 cancels the limiting of the cover plate 5, so that the cover plate 5 can be separated from the connecting bin 4, and then the biochemical filter bin 6 and the multi-surface spiral filter screen 7 can be conveniently taken out from the inside of the connecting bin 4, during installation, the cover plate 5 can be directly moved to the inside top end of the connecting bin 4, when the cover plate 5 moves to the position where the plug-in block 22 contacts with the connecting bin 4, the connecting bin 4 will press the plug-in block 22, so that the plug-in block 22 moves to the direction close to the plug-in rod 23, when the cover plate 5 moves to the position where the plug-in block 22 corresponds to the plug-in groove 26, the plug-in block 22 is pushed to the inside of the plug-in groove 26 under the elastic action of the telescopic spring 24, so that the installation of the cover plate 5 is completed, through the cooperation of the plug-in block 22, the plug-in rod 23 and the telescopic spring 24, the cover plate 5 and the connecting bin 4 can be conveniently and quickly separated, so that the biochemical filter bin 6 and the multi-surface spiral filter screen 7 can be conveniently taken out from the inside of the connecting bin 4, and the multi-surface spiral filter screen 7 can be conveniently cleaned.

[0032] As shown, Figure 6As shown, the end of the connecting rod 23 away from the connecting block 22 extends to the inner side of the cover plate 5; a lifting ball 25 is fixed to the end of the connecting rod 23 away from the connecting block 22. During operation, when the cover plate 5 needs to be opened to replace or clean the multi-faceted spiral filter 7, the lifting ball 25 is first pulled, causing the lifting ball 25 to move the connecting rod 23. When the connecting rod 23 moves, the connecting block 22 moves at the same time. This step facilitates the movement of the connecting rod 23 by pulling the lifting ball 25.

[0033] like Figure 1 As shown, the base 2 is equipped with an intelligent adjustable temperature controller. A constant temperature heating wire 3 is fixed to one end of the inner side of the tank body 1. The constant temperature heating wire 3 is electrically connected to the intelligent adjustable temperature controller. The fish tank is powered by a 12V DC transmission rack. The intelligent adjustable temperature controller and the constant temperature heating wire 3 maintain a balanced water temperature within the fish tank.

[0034] Working principle: When working, the multi-surface spiral filter screen 7 is a multi-surface spiral 3D structure, which can automatically block and break the fish feces and leftover bait to form a cultivation bed for nitrifying bacteria after the fish feces and leftover bait are sucked into the multi-surface spiral filter screen 7 by self-suction water. Each layer of the polyhedron has a width of 4 mm for the attachment of nitrifying bacteria. The self-suction or submersible pump is used, and because the polyhedron holes are cyclically staggered, the water pump will suck the fish feces and other substances into the multi-surface spiral filter screen 7 and will not be sucked away. The cyclic impact in each hole forms a broken fish feces and leftover bait, which is forcibly sucked into the multi-surface spiral filter screen 7. The structure of the polyhedron is that each layer of 1 mm wave-shaped sheet is overlapped and accumulated from multiple directions, which allows the water flow to pass through well, but can isolate substances larger than 1 mm in the cabin. These substances are slowly decomposed under the impact of water flow to form ultra-small fragments to provide nutrients for nitrifying bacteria. The 1 mm wide sheet structure greatly improves the attachment area of nitrifying bacteria, which can cultivate more nitrifying bacteria to achieve the effect of water change-free. When the connecting bin 4 needs to be taken out, first pull the lifting handle 14 upward, the lifting handle 14 drives the connecting plate 19 to move upward through the connecting rod 20 fixed thereto. When the connecting plate 19 moves, the driving rack 18 moves simultaneously. When the driving rack 18 moves, the transmission gear 16 connected with the driving rack 18 rotates. When the transmission gear 16 rotates, the transmission rod 15 rotates simultaneously. When the transmission rod 15 rotates, the driving gear 13 rotates simultaneously. When the driving gear 13 rotates, the moving rod 11 moves simultaneously through the transmission rack 12 engaged with the driving gear 13. Thus, the moving rod 11 drives the connecting block 10 to move. When the connecting groove 8 moves away from the connecting block 10, the connecting groove 8 cancels the limiting of the connecting bin 4, and the connecting bin 4 can be taken out from the inside of the base 2. When the cover plate 5 needs to be opened to replace or clean the multi-surface spiral filter screen 7, first pull the lifting ball 25, which drives the insertion rod 23 to move. When the insertion rod 23 moves, the insertion block 22 moves simultaneously. When the insertion rod 23 moves, the insertion block 22 moves simultaneously. When the insertion block 22 moves away from the insertion slot 26, the insertion block 22 cancels the limiting of the cover plate 5, so that the cover plate 5 can be separated from the connecting bin 4, and the biochemical filter bin 6 and the multi-surface spiral filter screen 7 can be taken out from the inside of the connecting bin 4. When installing, the cover plate 5 can be directly moved to the inside top end of the connecting bin 4. When the cover plate 5 moves to the position where the insertion block 22 contacts the connecting bin 4, the insertion block 22 is pushed to the inside of the insertion slot 26 under the elastic action of the extension spring 24, thereby completing the installation of the cover plate 5.

[0035] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A blocking type constant temperature water-changing-free mini fish tank, comprising a tank body (1), characterized in that: The lower end of the cylinder (1) is fixed with a base (2); the middle position of the top end of the base (2) is provided with a connecting bin (4); the connecting bin (4) is connected with the base (2) through two groups of connecting assemblies; the inner side of the connecting bin (4) is provided with a biochemical filter bin (6); the top end of the connecting bin (4) is provided with a cover plate (5); the cover plate (5) is connected with the connecting bin (4) through a plug-in assembly; the inner side of the biochemical filter bin (6) is fixed with a multi-surface spiral filter screen (7); the multi-surface spiral filter screen (7) is a multi-surface 3D spiral woven; one end of the connecting bin (4) is provided with a water outlet hole (9).

2. The block-style constant temperature water change-free mini fish tank according to claim 1, characterized in that: The connecting assembly comprises two connecting blocks (10); the two connecting blocks (10) are respectively and symmetrically arranged at the positions corresponding to the end of the connecting bin (4) on the inner side of the base (2); the connecting bin (4) is provided with a connecting groove (8) at the position corresponding to the connecting block (10); the connecting block (10) is plug-in connected with the connecting bin (4) through the connecting groove (8); the connecting block (10) is slidingly connected with the base (2); one end of the connecting block (10) away from the connecting bin (4) is fixed with a moving rod (11); the moving rod (11) is slidingly connected with the base (2); the top end of the other end of the moving rod (11) away from the connecting block (10) is fixed with a transmission rack (12); the inner side of the base (2) and above the transmission rack (12) is rotatably connected with a transmission rod (15); one end of the transmission rod (15) corresponding to the transmission rack (12) is fixed with a drive gear (13); the drive gear (13) is meshedly connected with the transmission rack (12); the inner side of the base (2) and the position corresponding to the transmission rod (15) is provided with a driving assembly.

3. A block heater constant temperature water changeless mini fish tank as claimed in claim 2, characterized in that: The driving assembly comprises a connecting plate (19); the connecting plate (19) is arranged on the inner side of the base (2) and at the position between the two drive gears (13); the connecting plate (19) is slidingly connected with the base (2); the lower end of each end of the connecting plate (19) is fixed with a moving frame (17); one end of the moving frame (17) close to the transmission rod (15) is fixed with a drive gear (18); one end of the transmission rod (15) corresponding to the drive gear (18) is fixed with a transmission gear (16); the transmission gear (16) is meshedly connected with the drive gear (18); the moving frame (17) is slidingly connected with the base (2).

4. A block heater constant temperature water changeless mini fish tank as claimed in claim 3, characterized in that: The top end of the connecting plate (19) is fixed with a connecting rod (20); the top end of each of the two connecting rods (20) extends to the outside of the top end of the base (2); the top end of each of the two connecting rods (20) is fixed with a pull handle (14); the outside of one end of the connecting rod (20) close to the connecting plate (19) is sleeved with a contraction spring (21); one end of the contraction spring (21) is fixedly connected with the connecting plate (19); the other end of the contraction spring (21) is fixedly connected with the base (2).

5. The block-style constant temperature water change-free mini fish tank according to claim 1, wherein: The plug-in assembly comprises two plug-in rods (23); the two plug-in rods (23) are respectively arranged at the inner side positions of the two ends of the cover plate (5); the plug-in rod (23) is in sliding connection with the cover plate (5); one end of the plug-in rod (23) close to the connecting bin (4) is fixed with a plug-in block (22); the plug-in block (22) is in sliding connection with the cover plate (5); the connecting bin (4) is provided with a plug-in slot (26) at a position corresponding to the plug-in block (22); the plug-in block (22) is in plug-in connection with the connecting bin (4) through the plug-in slot (26); one end of the plug-in rod (23) close to the plug-in block (22) is provided with an extension spring (24) outside; one end of the extension spring (24) is fixedly connected with the plug-in block (22); the other end of the extension spring (24) is fixedly connected with the cover plate (5).

6. A block heater mini-aquarium according to claim 5, wherein: One end of the plug-in rod (23) away from the plug-in block (22) extends to the inner side of the cover plate (5); the plug-in rod (23) is fixed with a pull ball (25) at the end away from the plug-in block (22).

7. The block-style constant temperature water change-free nano fish tank according to claim 1, characterized in that: The inner side of the base (2) is provided with a smart adjustable temperature controller; one end of the inner side of the cylinder body (1) is fixed with a constant temperature heating wire (3); the constant temperature heating wire (3) is in electrical connection with the smart adjustable temperature controller.

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