An automatic water changing device for an aquarium

Abstract

The utility model discloses an automatic water changing equipment for fish tank belongs to fish tank technical field, including fish tank, clean water bucket, waste water bucket, U -shaped tube, three -way pipe, water pump and solenoid valve, U -shaped tube one end is used for with fish tank inside intercommunication, and U -shaped tube other end is connected with three -way pipe one interface, this application, when changing water, water pump operation injects clean water into fish tank and drives water flow to cross over U -shaped tube highest point, closes water pump, and the siphon is formed after opening solenoid valve, and the siphon continues and arranges fish tank surface layer water to waste water bucket, when fish tank water level falls to siphon water inlet, air enters pipeline, and the siphon is automatically interrupted, the utility model gives priority to to discharge surface layer water containing oil film, reduces residual chlorine harm and water quality fluctuation, and the siphon stop is controlled by physical mechanism, does not need sensor, and the reliability is high, and liquid level sensor is only used for overflow protection, does not participate in siphon flow process.

Description

Technical Field

[0001] This utility model specifically relates to an automatic water changing device for aquariums, belonging to the field of aquarium technology. Background Technology

[0002] As containers that artificially simulate aquatic environments, aquariums are widely used in ornamental fish breeding, home decoration, and scientific research experiments. Through the synergistic effect of water, substrate, aquatic plants, and filtration systems, aquariums provide fish with the dissolved oxygen, temperature, and water quality necessary for survival. With the development of the ornamental fish industry, aquarium volumes range from small desktop tanks to large landscape tanks, and materials include glass and acrylic. They are also equipped with auxiliary equipment such as lighting, temperature control, and filtration to maintain the ecological balance of the water body and meet the growth needs of different species of fish.

[0003] In the daily maintenance of aquariums, water changes are a key step in ensuring stable water quality. The metabolic products of fish, uneaten food, and dead leaves and branches of aquatic plants will gradually accumulate, leading to an increase in the concentration of harmful substances such as ammonia nitrogen and nitrite in the water, which will disrupt the ecological balance of the aquatic body. Regular water changes can dilute the concentration of harmful substances, replenish trace elements, maintain a stable pH value, and prevent algae blooms.

[0004] Modern ornamental fish keepers have a deep understanding of the core knowledge of nitrification systems. They cultivate beneficial bacteria through high-efficiency filtration equipment to decompose ammonia and nitrite, and commonly use heaters for precise temperature control. Although filtration and temperature control are highly automated, water changes still rely on manual operation. The fast pace of life makes it difficult to consistently perform scientific water changes. Traditional automatic water changers usually require the installation of a submersible pump inside the aquarium when draining water, which takes up space inside the aquarium, or rely on a self-priming pump to pump water. This is not only costly, but the wastewater from the aquarium also accelerates the aging and failure of the pump. Therefore, this application provides an automatic water change device for aquariums. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an automatic water changing device for aquariums, enabling rapid and automatic water changes.

[0006] To further achieve the above objectives, the following technical solution is adopted:

[0007] An automatic water changing device for aquariums includes a fresh water tank, a waste water tank, a U-shaped pipe, a T-connector, a water pump, and a solenoid valve. One end of the U-shaped pipe is connected to the inside of the aquarium, and the other end of the U-shaped pipe is connected to an interface of the T-connector. A water inlet pipe is fixedly connected to the interface of the T-connector away from the U-shaped pipe. The water inlet of the water pump is submerged in the water inside the fresh water tank. The end of the water inlet pipe away from the T-connector is fixedly connected to the output end of the water pump. A drain pipe is fixedly connected to the interface of the T-connector away from the U-shaped pipe and the water inlet pipe. The end of the drain pipe away from the T-connector is located inside the waste water tank. The U-shaped pipe is height-adjustable. A check valve is installed on the section of the water inlet pipe between the water pump and the T-connector to prevent backflow of water. The solenoid valve is installed on the drain pipe to control the opening and closing of the drain pipe.

[0008] Preferably, the water pump is a centrifugal submersible pump, and a small vent hole is provided at the outlet of the water pump body on one side.

[0009] Preferably, a liquid level sensor is fixedly connected to one side of the inside of the fish tank. The liquid level sensor is set at a height that the water level inside the fish tank cannot reach under normal working conditions. The solenoid valve, water pump and liquid level sensor are all electrically connected to an external controller.

[0010] Preferably, when the liquid level sensor detects an abnormal rise in the water level inside the fish tank, it can trigger an alarm to control the external environment and stop the equipment from operating.

[0011] Preferably, an adjustment block is fixedly connected to the outer wall of the U-shaped tube, and a suction cup is symmetrically fixedly connected to one side of the adjustment block, the suction cup being able to adhere to the outer wall of the fish tank.

[0012] Preferably, both the water inlet pipe and the drain pipe are flexible hoses made of PE material.

[0013] Preferably, the height of the U-shaped tube extending into the fish tank is configured as the sole physical reference point for water level control. When the water level in the fish tank rises above the height of the tube opening, a siphon effect is triggered inside the U-shaped tube to start drainage. When the water level in the fish tank drops to the height of the tube opening, gas enters the inner cavity of the U-shaped tube through the tube opening, directly cutting off the siphon path to terminate drainage.

[0014] Preferably, the length of the U-shaped tube from the end that extends into the fish tank to the apex of the U-shaped tube is less than the length of the tube from the tee connection end to the apex of the U-shaped tube.

[0015] Preferably, the U-shaped tube is made of transparent acrylic material and has an inner diameter of 4-8 mm.

[0016] Beneficial effects:

[0017] 1. This application includes a clean water tank, a waste water tank, a U-shaped pipe, a T-shaped pipe, a water pump, and a solenoid valve. During water changes, the water pump injects clean water into the fish tank and drives the water flow over the highest point of the U-shaped pipe. After the solenoid valve is opened, a siphon is formed. When the water pump is turned off, the siphon continuously discharges the surface water of the fish tank to the waste water tank. When the water level in the fish tank drops to the siphon inlet, air enters the pipe, and the siphon is automatically interrupted. By prioritizing the discharge of surface water containing an oil film, the harmful effects of residual chlorine and water quality fluctuations are reduced. The siphon cessation is controlled by a physical mechanism, requiring no sensors and ensuring high reliability.

[0018] 2. This application is equipped with a check valve and a small vent hole. By opening a small vent hole on one side of the pump body, when the pump chamber is initially running with air in it, the gas will preferentially overflow from the small vent hole without having to overcome the resistance inside the water inlet pipe. As the pump runs, a small amount of water will overflow from the small vent hole, while the main water flow will push the gas trapped inside the water inlet pipe to one end. During this process, the pump will quickly rebuild the outlet pressure and restore a stable water flow, significantly improving the ability to resist air blockage and greatly improving convenience. At the same time, the check valve can be used to prevent backflow of water into the clean water tank when the solenoid valve is opened. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the liquid level sensor installation structure in this utility model;

[0021] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 4 This is a schematic diagram of the internal structure of the clean water tank in this utility model;

[0023] Figure 5 This is a three-dimensional structural diagram of the water pump in this utility model;

[0024] Figure 6 This is a three-dimensional structural diagram of the height adjustment mechanism in this utility model.

[0025] In the diagram: 2. Clean water tank; 3. Waste water tank; 4. U-shaped pipe; 5. T-shaped pipe; 6. Water inlet pipe; 7. Drain pipe; 8. Water pump; 9. Solenoid valve; 10. Check valve; 11. Vent hole; 12. Liquid level sensor; 13. Adjusting block; 14. Suction cup. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-6 As shown, an automatic water changing device for a fish tank includes a clean water tank 2, a waste water tank 3, a U-shaped pipe 4, a T-shaped pipe 5, a water pump 8, and a solenoid valve 9. One end of the U-shaped pipe 4 is connected to the inside of the fish tank, and the other end of the U-shaped pipe 4 is connected to one interface of the T-shaped pipe 5. A water inlet pipe 6 is fixedly connected to the interface of the T-shaped pipe 5 away from the U-shaped pipe 4. The water inlet of the water pump 8 is submerged in the water inside the clean water tank 2. The end of the water inlet pipe 6 away from the T-shaped pipe 5 is fixedly connected to the output end of the water pump 8. The T-shaped pipe 5 is located away from the U-shaped pipe 4. The interface between pipe 4 and water inlet pipe 6 is fixedly connected to drain pipe 7. The end of drain pipe 7 away from tee pipe 5 is located inside wastewater tank 3. U-shaped pipe 4 is installed with adjustable height. Water inlet pipe 6 is equipped with check valve 10 on the section between water pump 8 and tee pipe 5 to prevent backflow of water. Solenoid valve 9 is installed on drain pipe 7 to control the opening and closing of drain pipe 7. Water inlet pipe 6 and drain pipe 7 are both flexible hoses made of PE material. U-shaped pipe 4 is made of transparent acrylic material with an inner diameter of 4-8mm.

[0028] When using the U-shaped tube 4, first hang it on the fish tank, with one end above the water surface inside the tank. Connect the other end to the inlet pipe 6 and outlet pipe 7 via the T-connector 5. Place the ends of the inlet pipe 6 and outlet pipe 7 away from the T-connector 5 in the clean water tank 2 and waste water tank 3, respectively. When changing the water, first close the solenoid valve 9, then start the water pump 8. The water pump 8 will draw clean water from the clean water tank 2, gradually channeling it through the inlet pipe 6 into the U-shaped tube 4, filling it with water and creating conditions for siphoning during drainage. After the water pump 8 has run for a fixed time, such as 30 seconds, the water level inside the fish tank will be higher than the opening of the U-shaped tube 4. At this point, the pump can be stopped. When the water pump 8 starts, the solenoid valve 9 can be opened. At this time, according to the siphon principle, the water in the fish tank that is higher than the opening of the U-shaped tube 4 will be drawn into the wastewater tank 3 through the guidance of the U-shaped tube 4 and the drain pipe 7 until the water level in the fish tank is level with the opening of one end of the U-shaped tube 4. At this time, air will enter the U-shaped tube 4, which will physically destroy the siphon effect and automatically terminate it. At this time, the water level is accurately and stably at the level of the opening, with the error controlled within ≤5mm, so as to achieve one automatic water change. At the same time, when the water pump 8 is turned off, the check valve 10 can also be used to prevent backflow of water into the clean water tank 2 when the solenoid valve 9 is opened.

[0029] Additionally, when the equipment is first installed or when the user manually removes a large amount of water from the aquarium, the water level inside the aquarium is usually lower than the opening of the U-shaped pipe 4. If the water pump 8 is started and run for a fixed period of time, such as 30 seconds, the water level in the aquarium will still be lower than the opening of the U-shaped pipe 4 inside the aquarium. At this time, opening the solenoid valve 9 will prevent the siphon from starting. Only after multiple runs, when the amount of water added is much greater than the daily consumption, can the water level in the aquarium be gradually raised until the water change can be carried out normally.

[0030] By repeating the above method, high-frequency, micro-volume water changes are performed, with each water change strictly controlled to within 10% of the total aquarium volume. This ensures water quality renewal while maximizing water quality stability within the aquarium. With the injection of a small amount of new water, the residual chlorine is rapidly diluted by the large amount of water in the aquarium. Even if the water source in the clean water tank is newly connected tap water containing residual chlorine, the concentration can be significantly reduced, effectively avoiding chronic toxicity to fish. At the same time, due to the extremely small water change volume, the introduction of new water causes minimal disturbance to water temperature and pH. In addition, by prioritizing the discharge of surface water, oil film contaminants on the water surface can be removed simultaneously, improving the aquatic environment. By utilizing the difference between the water change volume and the evaporation rate, the water level in the aquarium can automatically return to the height of the U-shaped pipe opening, achieving constant water level in an unattended state, reducing human intervention. Furthermore, the interruption of the siphon effect is achieved by air entering the pipe. Using the height of the U-shaped pipe opening as a reference point, electronic sensors are eliminated, reducing the risk of equipment failure due to sensor malfunction.

[0031] Secondly, the purpose of this device is to dilute nitrates, stabilize the pH value, and draw water from the water surface. Since most fish waste sinks to the bottom of the aquarium or is sucked away by the aquarium filter, there are fewer large particles, but it is easy for bacteria and algae to grow. Therefore, after each water change, a specific time can be specified, such as daily or after each water change, for automatic cleaning. At this time, the solenoid valve 9 can be closed first, and then the water pump 8 can be started for 5 to 10 seconds to fill the U-shaped tube 4 with clean water. Then the water pump 8 can be turned off, and then the solenoid valve 9 can be opened to flush the drain pipe 7 with clean water. After repeating this several times, the purpose of cleaning the drain pipe 7 can be achieved, effectively inhibiting the production of bacteria and algae and greatly extending the maintenance cycle.

[0032] Additionally, during drainage, as the aquarium water level drops until it approaches the opening of the U-shaped pipe 4, both gas and liquid will be drawn in simultaneously. Therefore, to accommodate different users' requirements for the layout of the drain pipe 7, it can be arranged according to specific circumstances. For example, if the user places the wastewater bucket 3 not far from the aquarium, the drain pipe 7 will not experience much vertical movement, so a single 8mm PE hose can be used. A thicker hose will prevent clogging. However, if the user needs to connect a longer hose, such as passing it through a wall to a distant wastewater bucket 3 or bathroom drain, a double 4mm hose can be used. Under the same siphon conditions, a 4mm hose will provide better suction. The smaller diameter of the flexible hose allows for a faster water flow, generating a stronger impact force. This makes it less susceptible to gas contamination when using a 4mm hose, reducing the retention of gas and impurities and thus lowering the risk of clogging and ensuring more stable drainage. U-shaped hoses, preferably made of transparent acrylic, allow users to directly observe the water flow and air bubble status inside the hose. Setting its inner diameter to 4-8mm balances siphon efficiency with anti-clogging requirements.

[0033] Reference Figure 1 , Figure 4 and Figure 5 The water pump 8 is a centrifugal submersible pump, and a small vent hole 11 is provided at the outlet of the water pump body on one side.

[0034] To improve ease of installation, a two-meter-long water inlet pipe 6 is typically used to connect to the water pump 8. This flexible hose allows users to freely arrange the pipe routing according to available space, without strictly adhering to specific angles or paths. However, due to the length of the inlet pipe 6, it is prone to U-shaped or W-shaped bends during use. This can lead to a certain amount of air entering the inlet pipe 6 when the water level in the clean water tank 2 is low or when refilling. Furthermore, the check valve 10 on the inlet pipe 6 prevents the liquid and gas from flowing back to the water pump 8, even if the user is instructed to keep the inlet pipe 6 on an upward slope. This air accumulation inside the water pump 8 causes the impeller to spin dry, resulting in a complete loss of water pressure and forcing the user to... The system can only be restarted by shaking the water pump 8 or by drawing water from one end of the water inlet pipe 6. Therefore, by opening a small vent hole 11 on one side of the pump body of the water pump 8, when the pump chamber is initially running with air trapped inside, the gas can preferentially overflow from the vent hole 11 without overcoming the resistance inside the water inlet pipe 6. As the water pump 8 runs, a small amount of water will overflow from the vent hole 11, while the main water flow will push the gas trapped inside the water inlet pipe 6 to one end. During this process, the water pump 8 can quickly rebuild the outlet pressure, restore a stable water flow, significantly improve the ability to resist air blockage, and greatly improve convenience, allowing users to place the water inlet pipe 6 at will. At the same time, the closer the vent hole 11 is to the pump body of the water pump 8, the lower its resistance will be, and the easier it will be to fill with water and expel the air inside.

[0035] Reference Figure 1 and Figure 2 A liquid level sensor 12 is fixedly connected to one side of the fish tank. The liquid level sensor 12 is set to a height that the water level inside the fish tank cannot reach under normal working conditions. The solenoid valve 9, water pump 8 and liquid level sensor 12 are all electrically connected to an external controller. When the liquid level sensor 12 detects an abnormal rise in the water level inside the fish tank, it can trigger an alarm to control the external system and stop the equipment from operating.

[0036] During use, the liquid level sensor 12 will be positioned at a height that the water level inside the aquarium cannot reach under normal conditions. However, during daily drainage, if the drain pipe 7 becomes blocked or the solenoid valve 9 malfunctions and cannot be opened, causing the aquarium to only be able to add water but not drain it, the water level will gradually rise and come into contact with the liquid level sensor 12. At this time, after detecting the abnormal water level, the liquid level sensor 12 will immediately alert the external controller and issue an alarm to stop the equipment from operating, preventing the water level from continuing to rise and overflowing the aquarium.

[0037] Reference Figure 1 and Figure 6 An adjustment block 13 is fixedly connected to the outer wall of the U-shaped tube 4. A suction cup 14 is symmetrically fixedly connected to one side of the adjustment block 13. The suction cup 14 can be attached to the outer wall of the fish tank.

[0038] When in use, the suction cup 14 can be attached to the outer wall of the aquarium to restrict the position of the U-shaped tube 4. Secondly, by adjusting the suction height of the suction cup 14, the height of the U-shaped tube 4, the three-way tube 5, or the solenoid valve 9 can be adjusted. Furthermore, the U-shaped tube 4 can be set to slide and connect with the adjusting block 13, so that the U-shaped tube 4 can move up and down directly within the adjusting block 13.

[0039] Reference Figure 1 The height of the opening of the U-shaped pipe 4 at the end that extends into the fish tank is configured as the sole physical reference point for water level control. When the water level in the fish tank rises above this opening height, a siphon effect is triggered within the U-shaped pipe 4 to initiate drainage. When the water level in the fish tank drops to this opening height, gas enters the inner cavity of the U-shaped pipe 4 through this opening, directly cutting off the siphon path to terminate drainage. The length of the pipe section from the end of the U-shaped pipe 4 that extends into the fish tank to the apex of the U-shaped pipe 4 is less than the length of the pipe section from the T-junction end to the apex of the U-shaped pipe 4.

[0040] In actual use, when the solenoid valve 9 is opened to start the siphon, the drain pipe 7 often contains residual gas-liquid mixture from the last water change, which includes air and wastewater. At the same time, the outlet end of the drain pipe 7 is submerged in the external wastewater tank 3, which creates liquid column resistance. Both of these factors together make it difficult to start the water flow, and air bubbles are easily trapped at the top of the U-shaped pipe 4, causing the siphon to fail. Therefore, the section of the U-shaped pipe 4 connecting to the T-connector 5 is lengthened. As the water flows from the fish tank to the T-connector 5, the additional gravity created by the lengthened section can more effectively push the residual gas-liquid mixture, ensuring that the siphon can still be stably established even when the resistance of the drain pipe 7 is high.

[0041] As a technical optimization of this utility model: First, hang the U-shaped pipe 4 on the fish tank, with one end above the water surface inside the tank, and the other end connected to the water inlet pipe 6 and the drain pipe 7 via a T-connector 5. Place the ends of the water inlet pipe 6 and the drain pipe 7 away from the T-connector 5 in the clean water tank 2 and the waste water tank 3, respectively. When water needs to be changed, first close the solenoid valve 9, then start the water pump 8. The water pump 8 draws clean water from the clean water tank 2, causing the clean water to gradually flow into the U-shaped pipe 4 through the water inlet pipe 6, filling the U-shaped pipe 4 with clean water. This creates conditions for siphoning during drainage. When the water pump 8 operates... After a fixed time, such as 30 seconds, the water level inside the fish tank will rise above the opening of one end of the U-shaped tube 4. At this point, the water pump 8 can be stopped, and the solenoid valve 9 can be opened. Based on the siphon principle, the water in the fish tank that is higher than the opening of the U-shaped tube 4 will be drawn into the wastewater tank 3 through the U-shaped tube 4 and the drain pipe 7 until the water level inside the fish tank is level with the opening of one end of the U-shaped tube 4. At this point, air will enter the U-shaped tube 4, physically disrupting the siphon effect and automatically stopping it. The water level will then be precisely and stably at the level of the tube opening, with an error controlled within ≤5mm, thus achieving an automatic water change. Simultaneously, when the water pump 8 is turned off, the check valve 10 can also prevent backflow into the water pipe 6, thus preventing some dirty water from flowing back into the clean water tank 2 when the solenoid valve 9 is opened. Therefore, by repeating the above method to perform high-frequency, micro-volume water changes, where the volume of each water change is strictly controlled within 10% of the total volume of the aquarium, the water quality can be maintained to the maximum extent while ensuring water quality renewal. With the injection of a small amount of new water, the residual chlorine it contains is quickly diluted by the large amount of water in the aquarium. Even if the water source in the clean water tank is newly connected tap water containing residual chlorine, the concentration can still be reduced. It significantly reduces and effectively avoids chronic toxicity to fish. At the same time, due to the extremely small water exchange volume, the introduction of new water causes minimal disturbance to water temperature and pH. In addition, by prioritizing the discharge of water from the surface layer, oil film pollutants on the water surface can be removed simultaneously, improving the aquatic environment. By utilizing the difference between water exchange volume and evaporation, the water level in the aquarium can automatically return to the height of the U-shaped tube opening, achieving constant water level in an unattended state, reducing human intervention. Furthermore, the interruption of the siphon effect is achieved by air entering the pipe. Using the height of the U-shaped tube opening as a reference point, electronic sensors are eliminated, reducing the risk of equipment failure due to sensor malfunction.

[0042] Secondly, since the purpose of this device is to dilute nitrates, stabilize pH, and draw water from the water surface, while fish waste mostly sinks to the bottom of the aquarium or is sucked away by the aquarium filter, there are fewer large particles, but it is easy for bacteria and algae to grow. Therefore, after each water change, a specific time can be specified, such as daily or after each water change, for automatic cleaning. At this time, the solenoid valve 9 can be closed first, and then the water pump 8 can be started for 5 to 10 seconds to fill the U-shaped tube 4 with clean water. Then the water pump 8 can be turned off, and then the solenoid valve 9 can be opened to flush the drain pipe 7 with clean water. After repeating this several times, the purpose of cleaning the drain pipe 7 can be achieved, effectively inhibiting the production of bacteria and algae and greatly extending the maintenance cycle.

[0043] Additionally, during drainage, as the aquarium water level drops until it approaches the opening of the U-shaped pipe 4, both gas and liquid are simultaneously drawn in. Therefore, to accommodate different users' requirements for the layout of the drain pipe 7, it can be arranged according to specific circumstances. For example, if the user places the wastewater bucket 3 not far from the aquarium, the drain pipe 7 will not experience much vertical movement, so a single 8mm PE hose can be used. A thicker hose will prevent clogging. However, if the user needs to connect a longer hose, such as passing it through a wall to a distant wastewater bucket 3 or bathroom drain, a double 4mm hose can be used. Under the same siphon conditions, a 4mm hose... The smaller diameter of the flexible hose allows for a faster water flow, generating a stronger impact force. This makes it less susceptible to gas interference when using a 4mm hose, reducing the retention of gas and impurities and thus lowering the risk of clogging and making drainage more stable. U-shaped hoses preferably use transparent acrylic tubes, allowing users to directly observe the water flow and air bubble status inside the tube. At the same time, setting its inner diameter to 4-8mm can balance the needs of siphon efficiency and anti-clogging.

[0044] To improve ease of installation, a two-meter-long water inlet pipe 6 is typically used to connect to the water pump 8. This flexible hose allows users to freely arrange the pipe routing according to available space, without strictly adhering to a specific angle or path. However, due to the length of the inlet pipe 6, it is prone to U-shaped or W-shaped bends during use. This can lead to a certain amount of air entering the inlet pipe 6 when the water level in the clean water tank 2 is low or when refilling. Furthermore, the check valve 10 on the inlet pipe 6 prevents the liquid and gas from flowing back to the water pump 8, even if the user is instructed to keep the inlet pipe 6 on an upward slope. This air accumulation inside the water pump 8 causes the impeller to spin dry, resulting in a complete loss of water pressure and forcing the user to shake the pump. The system can only be restarted by pump 8 or by drawing water from one end of the water inlet pipe 6. Therefore, by opening a small vent hole 11 on one side of the pump body of the water pump 8, when the pump chamber is initially running with air in it, the gas can first overflow from the small vent hole 11 without having to overcome the resistance inside the water inlet pipe 6. As the water pump 8 runs, a small amount of water will overflow from the small vent hole 11, while the main water flow will push the gas trapped inside the water inlet pipe 6 to one end. During this process, the water pump 8 will quickly rebuild the outlet pressure, restore a stable water flow, significantly improve the ability to resist air blockage, and greatly improve convenience, allowing users to place the water inlet pipe 6 at will. At the same time, the closer the small vent hole 11 is to the pump body of the water pump 8, the lower its resistance will be, and the easier it will be to fill with water and expel the air inside.

[0045] Furthermore, during use, the suction cup 14 can be attached to the outer wall of the aquarium to restrict the position of the U-shaped tube 4. Secondly, by adjusting the suction height of the suction cup 14, the height of devices such as the U-shaped tube 4, the three-way tube 5, or the solenoid valve 9 can be adjusted. Additionally, the U-shaped tube 4 can be slidably connected to the adjusting block 13, allowing the U-shaped tube 4 to move up and down directly within the adjusting block 13.

[0046] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic water changing device for a fish tank, comprising a fresh water tank (2), a waste water tank (3), a U-shaped pipe (4), a T-shaped pipe (5), a water pump (8), and a solenoid valve (9), characterized in that: One end of the U-shaped pipe (4) is used to connect to the inside of the fish tank. The other end of the U-shaped pipe (4) is connected to one interface of the three-way pipe (5). The interface of the three-way pipe (5) away from the U-shaped pipe (4) is fixedly connected to a water inlet pipe (6). The water inlet of the water pump (8) is submerged in the water inside the clean water tank (2). The end of the water inlet pipe (6) away from the three-way pipe (5) is fixedly connected to the output end of the water pump (8). The interface of the three-way pipe (5) away from the U-shaped pipe (4) and the water inlet pipe (6) is fixedly connected to a drain pipe (7). The end of the drain pipe (7) away from the three-way pipe (5) is located inside the wastewater tank (3). The U-shaped pipe (4) is installed with adjustable height. The section of the water inlet pipe (6) between the water pump (8) and the three-way pipe (5) is equipped with a check valve (10) to prevent backflow of water. The solenoid valve (9) is installed on the drain pipe (7) to control the opening and closing of the drain pipe (7).

2. The automatic water changing device for aquarium as described in claim 1, characterized in that: The water pump (8) is a centrifugal submersible pump, and an exhaust hole (11) is provided at the outlet of the pump body on one side of the water pump (8).

3. The automatic water changing device for aquarium as described in claim 1, characterized in that: A liquid level sensor (12) is fixedly connected to one side of the inside of the fish tank. The liquid level sensor (12) is set at a height that the water level inside the fish tank cannot reach under normal working conditions. The solenoid valve (9), water pump (8) and liquid level sensor (12) are all electrically connected to an external controller.

4. An automatic water changing device for a fish tank as described in claim 3, characterized in that: When the liquid level sensor (12) detects an abnormal rise in the water level inside the fish tank, it can trigger an alarm to control the outside world and stop the operation of the equipment.

5. An automatic water changing device for a fish tank as described in claim 1, characterized in that: An adjustment block (13) is fixedly connected to the outer wall of the U-shaped tube (4), and a suction cup (14) is symmetrically fixedly connected to one side of the adjustment block (13). The suction cup (14) can be adsorbed onto the outer wall of the fish tank.

6. An automatic water changing device for a fish tank as described in claim 1, characterized in that: Both the water inlet pipe (6) and the drain pipe (7) are flexible hoses made of PE material.

7. An automatic water changing device for a fish tank as described in claim 1, characterized in that: The height of the opening of the U-shaped tube (4) extending into the fish tank is configured as the only physical reference point for water level control. When the water level in the fish tank rises above the height of the opening, a siphon effect is triggered inside the U-shaped tube (4) to start drainage. When the water level in the fish tank drops to the height of the opening, gas enters the inner cavity of the U-shaped tube (4) through the opening, directly cutting off the siphon path to terminate drainage.

8. An automatic water changing device for a fish tank as described in claim 1, characterized in that: The length of the U-shaped tube (4) from the end that extends into the fish tank to the apex of the U-shaped tube (4) is less than the length of the section from the tee connection end to the apex of the U-shaped tube (4).

9. An automatic water changing device for a fish tank as described in claim 1, characterized in that: The U-shaped tube (4) is made of transparent acrylic material and has an inner diameter of 4-8mm.

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