Pet water fountain

Abstract

This utility model discloses a pet water fountain, belonging to the field of pet supplies technology. It includes: a water tank and a main unit integrated on a base; a drinking tray positioned above the water tank and connected to it via a drain outlet. The main unit houses a first water pump and a second water pump. The first water pump's inlet is connected to the water tank, and its outlet is connected to a detachable filter head. The filter head's outlet is located on top of the drinking tray, forming an internal circulation purification loop between the water tank, the first water pump, the filter head, and the drinking tray, achieving continuous filtration and flowing water supply. The second water pump's inlet is connected to an external water source, and its outlet is connected to the filter head, forming an external water supply loop between the external water source, the second water pump, the filter head, the drinking tray, and the water tank. Both loops share a filter head, ensuring that all water entering the system is purified. This structure achieves fully automatic operation with "drinking and filtering simultaneously, replenishing water as needed," improving the device's intelligence level and making it suitable for long-term unattended scenarios, avoiding water outages and water pollution problems.

Description

Technical Field

[0001] This utility model belongs to the field of pet supplies technology, specifically relating to a pet water dispenser. Background Technology

[0002] With the improvement of people's living standards and the popularization of pet ownership, pet health is receiving increasing attention. As an indispensable drinking water device in pets' daily lives, pet water fountains have gradually evolved from simple static water bowls into intelligent products with circulating filtration functions.

[0003] Most pet water fountains on the market use a water pump to pump water from the tank to the drinking dish, creating a flowing water body to attract pets to drink. They also use built-in filters to perform preliminary filtration of the water, achieving a certain degree of water purification.

[0004] However, existing pet water fountains generally have a significant drawback: most products only have an internal circulation filtration function and lack automatic water replenishment capabilities. They require manual opening of the water tank to add water, and the frequent manual water replenishment operation causes inconvenience to users and reduces the intelligent experience of the product. Utility Model Content

[0005] This invention addresses the aforementioned problems in the existing technology by proposing a pet water dispenser that integrates an internal circulation purification system and an external automatic water replenishment system.

[0006] This utility model can be achieved through the following technical solutions:

[0007] A pet water fountain includes:

[0008] The water tank and the main unit are integrated on the base;

[0009] A drinking tray is provided on the water tank, and the drinking tray has a drain outlet that communicates with the water tank;

[0010] The filter head has its inlet end detachably connected to the main unit, and its outlet end located on top of the drinking tray;

[0011] The first water pump is installed inside the main unit box. Its inlet end is connected to the water in the water tank, and its outlet end is connected to the filter head through a pipeline. An internal circulation purification loop is formed between the water tank, the first water pump, the filter head, and the drinking tray.

[0012] The second water pump is installed inside the main unit. Its inlet is connected to an external water source through a pipe, and its outlet is connected to the filter head through a pipe. An external water supply circuit is formed between the external water source, the second water pump, the filter head, the drinking tray, and the water tank.

[0013] As a further improvement of this utility model, a drain outlet is provided on the bottom surface of the water tank, and the drain outlet is used to connect the inner cavity of the water tank with the inner cavity of the base.

[0014] As a further improvement of this utility model, the base is provided with a water outlet connector, the water outlet connector covers the drain and is equipped with a one-way valve, the water inlet of the first water pump is connected to the water outlet connector through a pipeline, and a sterilization pipe is connected in series on the pipeline between the first water pump and the water outlet connector.

[0015] As a further improvement of this utility model, the side wall of the main unit is provided with a quick connector for connecting to an external water source, and the water inlet end of the second water pump is connected to the quick connector.

[0016] As a further improvement of this utility model, a filter element connector is installed on the side wall of the top of the main unit box. The first water pump and the second water pump are respectively connected to the filter element connector through pipelines. The water inlet end of the filter element head is detachably connected to the filter element connector.

[0017] As a further improvement of this utility model, the inner wall of the connection port of the filter element connector for connecting the filter element head is provided with a protruding snap-fit ​​block, and the tube opening of the filter element head for connecting the filter element connector is provided with a protruding snap-fit ​​rib. The snap-fit ​​rib and the snap-fit ​​block form a rotation locking structure.

[0018] As a further improvement of this utility model, the drinking tray is composed of two stacked trays, a first tray and a second tray, with a space between the first tray and the second tray.

[0019] The first disc has a residue filter hole, and the interlayer space is used to receive the residue that settles through the residue filter hole, so as to physically isolate the water in the first disc from the residue.

[0020] As a further improvement of this utility model, a filter box is provided at the bottom of the second disc, and the filter box is located inside the water tank.

[0021] The drain outlet is located on the first plate, and the second plate has an upwardly extending baffle portion, which is adapted to the shape of the drain outlet and embedded in the drain outlet.

[0022] The baffle section forms a drainage channel after being closed, and the water in the first disc flows into the filter box through the drainage channel.

[0023] As a further improvement of this utility model, a sealing ring is provided at the connection between the filter element connector and the filter element head.

[0024] As a further improvement of this utility model, the bottom surface of the water tank is provided with a groove, and the base is provided with an upwardly protruding heating plate. The heating plate is embedded in the groove. The heating plate can be directly attached to the bottom surface of the water tank, or a metal heat-conducting sheet is provided between the contact surface of the heating plate and the bottom surface of the water tank.

[0025] As a further improvement of this utility model, a water level sensor is provided in the water tank to detect the water level in the water tank. When the water level in the water tank is lower than the threshold, the control system starts the second water pump.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Achieve fully automatic circulating purification and intelligent water replenishment, eliminating the need for manual intervention.

[0028] By setting up a first water pump to form an internal circulation purification loop, the water is continuously filtered and kept flowing. At the same time, a second water pump is configured to connect to an external water source. Combined with the water level sensor, water replenishment is automatically started, forming an external water replenishment loop. The dual loops work together to achieve fully automated operation of "drinking while filtering, and replenishing water when it is low". This significantly improves the intelligence level of the equipment and is suitable for scenarios where no one is available for a long time.

[0029] 2. Ensure water quality safety

[0030] Both the internal circulating water and the external water supply are filtered through the same filter head, ensuring that both the water returning from the water tank and the newly added water are effectively purified. This avoids the secondary pollution problem caused by "direct injection of raw water" in traditional water supply methods, truly achieving "purification + supply integration" and comprehensively improving drinking water hygiene standards.

[0031] 3. The water tank features a quick-release, self-closing connection structure, preventing leaks and facilitating maintenance.

[0032] The bottom of the water tank connects to the drain outlet with a top-mounted outlet and a one-way valve structure, enabling automatic connection during installation and automatic sealing during disassembly. Combined with a ring-shaped filter cotton for primary filtration, this prevents the water pump from sucking in impurities and eliminates leakage during disassembly and cleaning, greatly improving the convenience and safety of user operation.

[0033] 4. Constructs a multi-stage purification system combining physical filtration and UV sterilization for deep antibacterial effects.

[0034] A UV sterilization tube is installed at the front end of the water pump to irradiate the circulating water with high-intensity ultraviolet light, effectively killing bacteria, viruses, algae and other microorganisms. Combined with filter head filtration, residue isolation and UV sterilization, a multi-level water quality safety guarantee is formed, eliminating the risk of biological pollution caused by long-term water circulation and making it more beneficial to pet health.

[0035] 5. The separate drinking tray design enables automatic separation and centralized collection of water residue.

[0036] The drinking tray adopts an upper and lower layered structure. The first tray has a residue filter hole, which uses the principle of gravity sedimentation to guide food residue into the interlayer space. With the help of the inclined flow guide structure and the water drop channel, the purified water is guided into the filter box and flows back to the water tank. This design achieves physical isolation between water and residue, keeps the drinking area clean, and facilitates regular cleaning, improving hygiene and maintenance efficiency. Attached Figure Description

[0037] Figure 1 This is a structural schematic diagram of the pet water dispenser of this utility model;

[0038] Figure 2 This is a schematic diagram of the internal structure of the pet water dispenser of this utility model;

[0039] Figure 3 This is a schematic diagram of the structure of the groove at the bottom of the water tank of this utility model;

[0040] Figure 4 This is a schematic diagram of the filter head of this utility model;

[0041] Figure 5 This is a schematic diagram of the filter element connector of this utility model;

[0042] Figure 6 This is a cross-sectional view of the pet water dispenser of this utility model;

[0043] Figure 7 This is the utility model Figure 6 A magnified view of a section at point A in the middle;

[0044] Figure 8 This is a schematic diagram of the structure of the drinking tray of this utility model;

[0045] Figure 9 This is a cross-sectional view of the drinking tray of this utility model.

[0046] In the diagram, 100 is the water tank; 110 is the drain outlet; 120 is the check valve; 121 is the valve body; 122 is the valve body spring; 130 is the annular filter cotton; 140 is the drain cover; and 150 is the groove.

[0047] 200. Main unit casing; 210. Filter cartridge head; 211. Snap-fit ​​rib; 220. First water pump; 221. Sterilization tube; 230. Second water pump; 240. Quick connector; 250. Filter cartridge connector; 251. Snap-fit ​​block; 252. Sealing ring; 260. Battery; 270. Control panel; 280. Charging port;

[0048] 300. Base; 310. Water outlet connector; 311. Top; 320. Heating plate;

[0049] 400. Drinking tray; 410. First tray body; 411. Drain outlet; 411. Residue filter hole; 420. Second tray body; 421. Interlayer space; 422. Drain channel; 430. Filter box. Detailed Implementation

[0050] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0051] like Figures 1-9 As shown, this utility model provides a pet water fountain, comprising:

[0052] The water tank 100 and the main unit 200 are integrated on the base 300;

[0053] A drinking tray 400 is installed on a water tank 100, and the drinking tray 400 has a drain outlet 411 that communicates with the water tank 100;

[0054] The filter head 210 has its inlet end detachably connected to the main unit 200, and its outlet end located on top of the drinking tray 400;

[0055] The first water pump 220 is installed inside the main unit box 200. Its inlet end is connected to the water tank 100, and its outlet end is connected to the filter head 210 through a pipeline. An internal circulation purification loop is formed between the water tank 100, the first water pump 220, the filter head 210, and the drinking tray 400.

[0056] The second water pump 230 is installed inside the main unit box 200. Its inlet end is connected to an external water source through a pipeline, and its outlet end is connected to the filter head 210 through a pipeline. An external water supply loop is formed between the external water source, the second water pump 230, the filter head 210, the drinking tray 400, and the water tank 100.

[0057] Furthermore, the working principles of the internal circulation purification circuit and the external water supply circuit are explained in detail below:

[0058] Internal circulation purification loop: During daily operation, the first water pump 220 starts, draws water from the water tank 100, and transports it through the pipeline to the filter head 210 for filtration and purification. The purified water flows to the top of the drinking tray 400 and flows out, forming a flowing water body for pets to drink. The water used is returned to the water tank 100 through the drain 411 on the drinking tray 400, thus forming a continuous internal circulation purification loop.

[0059] This process effectively prevents water stagnation, reduces bacterial growth, keeps water quality fresh, and increases pets' willingness to drink.

[0060] External water supply loop: When the water level in the water tank 100 decreases to below the preset level due to drinking or evaporation, the water level sensor in the water tank 100 detects the low water level signal and transmits the information to the control system, which then automatically starts the second water pump 230. The second water pump 230 draws water from an external water source, and its outlet water is also transported to the same filter head 210 for filtration through the pipeline. The filtered clean water enters the drinking basin 400 and is replenished to the water tank 100 through the drain outlet 411, forming an external water supply loop.

[0061] The water replenishment process is carried out under the monitoring of the control system and will automatically stop when the water level returns to a safe range.

[0062] It is worth mentioning that the pet water fountain provided in this embodiment has at least the following advantages compared to existing products:

[0063] 1. Solves the problem of frequent manual water replenishment required for existing pet water fountains.

[0064] The water supply circuit is set up to connect the second water pump 230 to an external water source, realizing the automatic water supply function, which significantly improves the continuous operation capability and intelligence level of the equipment, and is especially suitable for home scenarios where no one is watching for a long time.

[0065] 2. Purify water quality and ensure pet drinking water safety.

[0066] The external water source shares the same filter head 210 as the internal circulation system. All water entering the drinking system (whether it is circulating water or replenished water) must be purified by the filter head to ensure the cleanliness of the replenished water. This truly achieves the integration of "purification + replenishment" and ensures the safety of pet drinking water.

[0067] 3. High structural integration, efficient and reliable operation.

[0068] By using two water pumps to perform the "circulation" and "replenishment" functions respectively, and sharing the same filter head 210, the design of redundant filtration modules is avoided, saving space and reducing costs, while improving the overall coordination and maintenance convenience of the system.

[0069] 4. Improve equipment lifespan and operational safety

[0070] The automatic water replenishment mechanism can effectively prevent problems such as the first water pump 220 running dry or burning due to low water level, protect core components, and extend the service life of the whole machine.

[0071] Overall, the pet water fountain provided in this embodiment constructs an independent but collaborative internal circulation purification loop and an external water replenishment loop. Without the need for manual intervention, it achieves the dual goals of continuous water purification and automatic water replenishment, overcoming the technical defects of existing pet water fountains such as single function, reliance on manual maintenance, and unclean water replenishment. It has significant progressiveness and practical value.

[0072] Preferably, the bottom surface of the water tank 100 is provided with a drain outlet 110, which is used to connect the inner cavity of the water tank 100 with the inner cavity of the base 300. The base 300 is provided with a water outlet connector 310, which covers the drain outlet 110 and is equipped with a one-way valve 120. The water inlet of the first water pump 220 is connected to the water outlet connector 310 through a pipeline.

[0073] Specifically, the water outlet connector 310 has an upward-lifting head 311, and the one-way valve 120 consists of a valve body 121, a valve body spring 122, an annular filter cotton 130, and a drain cover 140. The valve body spring 122 is sleeved on the valve body 121, and the annular filter cotton 130 is sleeved outside the valve body 121. It can initially intercept larger particles of impurities before the water flows into the water pump, playing a primary filtration protection role. The drain cover 140 covers the top of the annular filter cotton 130.

[0074] When the water tank 100 is assembled, the top 311 of the outlet connector 310 pushes up the valve body 121 of the one-way valve 120, overcoming the elastic force of the valve body spring 122 and causing the valve port sealing ring of the valve body 121 to be pushed up, thereby opening the water flow channel and realizing the conduction between the water tank 100 and the first water pump 220; when the water tank 100 is removed, the valve body 121 is reset under the action of the spring, the valve port sealing ring is pressed tightly against the cover again, and the outlet is automatically closed to prevent the leakage of residual water in the water tank 100.

[0075] The structural design enables the quick-release self-closing connection of the water tank 100. Users do not need to manually close the valve when cleaning or replacing the water tank 100. It automatically seals when removed and automatically connects when installed. The operation is convenient and there is no risk of leakage.

[0076] Furthermore, a sterilization tube 221 is connected in series on the pipeline between the first water pump 220 and the water outlet connector 310. This sterilization tube 221 is a UV sterilization tube 221, which is equipped with a UV lamp assembly. When water flows through this pipe section, the UV light acts on the water body to achieve a highly efficient and chemical-residue-free broad-spectrum sterilization effect.

[0077] By setting up the sterilization tube 221, the water returning from the water tank 100 is exposed to high-intensity ultraviolet radiation before entering the first water pump 220, which effectively kills bacteria, algae and pathogenic microorganisms that the filter cartridge could not completely remove, and significantly improves the biological safety of the circulating water.

[0078] Combining the physical filtration of the filter head 210 with the residue isolation function of the drinking tray 400, this structure constructs a multi-stage purification system of "physical filtration - UV deep sterilization - circulating flow," eliminating the risk of secondary pollution and ensuring that pets have access to clean and hygienic water for a long time. Meanwhile, UV sterilization is a physical process, requiring no consumables and producing no byproducts, ensuring stable and reliable operation and greatly enhancing the water dispenser's intelligence and health protection capabilities.

[0079] Preferably, the side wall of the main unit 200 is provided with a quick connector 240 for connecting to an external water source, and the water inlet end of the second water pump 230 is connected to the quick connector 240 to facilitate the connection of the second water pump 230 to the external water source.

[0080] Preferably, a filter element connector 250 is installed on the side wall of the top of the main unit 200. The outlet ends of the first water pump 220 and the second water pump 230 are respectively connected to the filter element connector 250 through pipelines, so that the internal circulating water and the external replenishment water converge at the filter element connector 250 and are uniformly delivered to the filter element head 210 for filtration. The water inlet end of the filter element head 210 and the filter element connector 250 are detachably connected, which is convenient for daily maintenance and replacement.

[0081] Specifically, the inner wall of the filter element connector 250 is provided with a protruding snap-fit ​​block 251, and the inlet of the filter element head 210 is provided with a corresponding protruding snap-fit ​​rib 211. During installation, after inserting the filter element head 210 into the filter element connector 250, it is rotated at a certain angle, and the snap-fit ​​rib 211 and the snap-fit ​​block 251 are engaged with each other to form a reliable rotation locking structure.

[0082] This structure enables quick assembly and disassembly, allowing for tool-free replacement of the filter head 210 while ensuring a secure and reliable connection to prevent water leakage. The sealing ring 252 at the connection further enhances the waterproof performance of the interface. This design not only improves the ease of operation for users but also enhances the overall modularity and maintainability of the equipment, making it suitable for applications requiring frequent cleaning or periodic filter replacement.

[0083] In addition, the main unit 200 also contains a main control board and a battery 260. The area on the top of the main unit 200 that extends beyond the water dispenser 400 is set as a control panel 270 for user control. At the same time, the side of the main unit 200 also has a charging port 280.

[0084] Preferably, the drinking tray 400 is composed of two stacked trays, a first tray 410 and a second tray 420, with a space 421 formed between the first tray 410 and the second tray 420.

[0085] The first disc 410 has a residue filter hole 411, and the interlayer space 421 is used to receive the residue that settles through the residue filter hole 411, so as to physically isolate the water in the first disc 410 from the residue.

[0086] Specifically, the principle of separating clean water from food residue is based on the gravity settling of food residue. Since food residue is heavier than water, when a pet drinks water from the first dish 410, food residue mixed in with the water will naturally settle into the food residue dish through the food residue filter holes 411, while the relatively clean water remains in the first dish 410.

[0087] This natural sedimentation and sieving process effectively separates water from solid impurities, keeping the drinking area that pets come into direct contact with clean and preventing pets from ingesting food residue while drinking.

[0088] It is worth mentioning that the water bowl 400 provided in this embodiment has at least the following advantages compared to existing pet water bowls 400:

[0089] 1. Solve the problem of ineffective separation of residue and water.

[0090] By setting up an upper and lower layered structure and a through-hole filter for residue 411, the residue is actively guided to sink into an independent space, achieving physical isolation between the water and the residue, and fundamentally avoiding the accumulation of residue in the drinking water area and secondary pollution.

[0091] 2. Improve water cleanliness and hygiene standards

[0092] By collecting the residue in the enclosed interlayer space 421, the contact time between the residue and the water in the first tray 410 is reduced, effectively slowing down water quality deterioration, improving drinking water safety, and being more beneficial to pet health.

[0093] 3. Simple structure and requires no energy to operate.

[0094] Utilizing the principle of natural separation by gravity, it requires no additional power support, has a simple and reliable structure, reduces failure rate and operating costs, and is more energy-efficient and environmentally friendly.

[0095] 4. Easy to clean and maintain

[0096] The residue is stored in the removable second tray 420, which users can simply remove and clean periodically, avoiding the tedious process of scrubbing the entire drinking tray 400 and greatly improving cleaning efficiency and ease of use.

[0097] Overall, the pet drinking dish 400 provided in this embodiment, through its innovative layered structure design and gravity filtration mechanism, effectively overcomes the technical defects of existing pet drinking dishes 400, such as "difficulty in separating residue, easy contamination of water quality, and inconvenience in cleaning," and provides an efficient, hygienic, and easy-to-maintain pet drinking solution.

[0098] Furthermore, the receiving surface of the first disc 410 for carrying water is set as a flow guiding structure with an inclined or curved surface. At the same time, the residue filter hole 411 is located at the lowest position of the receiving surface of the first disc 410. This design guides food residue, hair and other impurities in the water to automatically gather to the lowest point along the inclined or curved surface under the action of gravity and water flow, and precisely guides them to the residue filter hole 411 located at the lowest point, so as to achieve efficient and concentrated discharge of impurities.

[0099] This structure works in synergy to significantly improve residue settling and filtration efficiency, preventing impurities from lingering in the drinking water area or accumulating in dead corners, effectively preventing filter pore blockage, and ensuring a smooth separation process. At the same time, impurities are quickly guided away from the main water body, greatly extending the cleaning time of the purified water area, improving the drinking water hygiene level and the device's self-cleaning ability, making the product easier to maintain and more convenient and reliable to use.

[0100] Preferably, the bottom of the second disc 420 is provided with a filter box 430, which is located inside the water tank 100 and is used to output purified water to the water tank 100 for recycling.

[0101] The drain outlet 411 is provided on the first plate 410, and the second plate 420 has an upwardly extending baffle portion that is adapted to the shape of the drain outlet 411 and embedded in the drain outlet 411.

[0102] After the baffle is closed, a water discharge channel 422 is formed, and the water in the first plate 410 flows into the filter box 430 through the water discharge channel 422.

[0103] The structural design realizes the orderly guidance and system integration of water flow path: when the water level in the first plate 410 rises above the drain outlet 411, the excess water or water that has undergone preliminary sedimentation overflows from the drain outlet 411 on the higher side and enters the drain channel 422 formed by the baffle. The drain channel 422 directly guides the water flow to the filter box 430 at the bottom for deep purification. The filtered clean water is further transported to the water tank 100, completing the closed-loop process of water purification and recycling.

[0104] Preferably, the bottom of the water tank 100 is provided with a groove 150, and the base 300 is provided with an upwardly protruding heating plate 320. The heating plate 320 is provided with a heating element, and the heating plate 320 is embedded in the groove 150. After the heating element is heated, the heat is transferred through the heating plate 320 (that is, the heating element is completely water and electricity isolated from the outside world), thereby achieving the purpose of temperature control of the water in the water tank 100, and can achieve the effects of heat preservation and cooling according to the user's needs.

[0105] The heating plate 320 can be directly attached to the bottom surface of the water tank 100 for heat conduction, or a metal heat-conducting sheet can be added between the two surfaces to further improve the heat conduction efficiency.

[0106] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

[0107] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0108] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0109] The technical solutions of the various embodiments of this utility model can be combined with each other, but only if they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0110] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A pet water fountain, characterized in that, include: The water tank and the main unit are integrated on the base; A drinking tray is provided on the water tank, and the drinking tray has a drain outlet that communicates with the water tank; The filter head has its inlet end detachably connected to the main unit, and its outlet end located on top of the drinking tray; The first water pump is installed inside the main unit box. Its inlet end is connected to the water in the water tank, and its outlet end is connected to the filter head through a pipeline. An internal circulation purification loop is formed between the water tank, the first water pump, the filter head, and the drinking tray. The second water pump is installed inside the main unit. Its inlet is connected to an external water source through a pipe, and its outlet is connected to the filter head through a pipe. An external water supply circuit is formed between the external water source, the second water pump, the filter head, the drinking tray, and the water tank.

2. The pet water fountain according to claim 1, characterized in that, The bottom surface of the water tank is provided with a drain outlet, which is used to connect the inner cavity of the water tank with the inner cavity of the base.

3. A pet water fountain according to claim 2, characterized in that, The base is equipped with a water outlet connector, which covers the drain outlet and is fitted with a one-way valve. The inlet of the first water pump is connected to the water outlet connector via a pipeline, and a sterilization pipe is connected in series on the pipeline between the first water pump and the water outlet connector.

4. A pet water fountain according to claim 1, characterized in that, The side wall of the main unit is provided with a quick connector for connecting to an external water source, and the inlet end of the second water pump is connected to the quick connector.

5. A pet water fountain according to claim 1, characterized in that, A filter element connector is installed on the side wall of the top of the main unit. The first water pump and the second water pump are respectively connected to the filter element connector through pipelines. The water inlet end of the filter element head is detachably connected to the filter element connector.

6. A pet water fountain according to claim 5, characterized in that, The inner wall of the connection port of the filter element connector for connecting the filter element head is provided with a protruding snap-fit ​​block, and the tube opening of the filter element head for connecting the filter element connector is provided with a protruding snap-fit ​​rib. The snap-fit ​​rib and the snap-fit ​​block form a rotation locking structure.

7. A pet water fountain according to claim 1, characterized in that, The drinking tray consists of two stacked trays, a first tray and a second tray, with a space between them. The first disc has a residue filter hole, and the interlayer space is used to receive the residue that settles through the residue filter hole, so as to physically isolate the water in the first disc from the residue.

8. A pet water fountain according to claim 7, characterized in that, The bottom of the second disc is equipped with a filter box, which is located inside the water tank. The drain outlet is located on the first plate, and the second plate has an upwardly extending baffle portion, which is adapted to the shape of the drain outlet and embedded in the drain outlet. The baffle section forms a drainage channel after being closed, and the water in the first disc flows into the filter box through the drainage channel.

9. A pet water fountain according to claim 1, characterized in that, The bottom surface of the water tank is provided with a groove, and the base is provided with an upwardly protruding heating plate. The heating plate is embedded in the groove. The heating plate can be directly attached to the bottom surface of the water tank, or a metal heat-conducting sheet is provided between the contact surface of the heating plate and the bottom surface of the water tank.

10. A pet water fountain according to claim 1, characterized in that, The water tank is equipped with a water level sensor, which is used to detect the water level in the water tank. When the water level in the water tank is lower than the threshold, the control system starts the second water pump.

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