A pressurized water supply device

Abstract

This utility model discloses a pressurized water supply device, relating to the field of water supply equipment technology. Addressing the problems of poor filtration, easy clogging, and low automation in existing devices, the following solution is proposed: A water tank is included, with a filtration mechanism fixed to one inner wall of the tank. The filtration mechanism includes a drive assembly and a filter assembly. The drive assembly includes a mounting plate, a fixing plate welded to the bottom of one outer wall of the mounting plate, a connecting plate welded to the top of one outer wall of the mounting plate, and an impeller disposed between the connecting plate and the fixing plate. The filter assembly includes a circular groove and an octagonal frame welded to the bottom of the circular groove. This utility model offers excellent filtration and strong anti-clogging capability: through multi-stage filtration and water flow disturbance design, it solves the problems of poor filtration and easy clogging in traditional devices. In the eight independent filter chambers of the filter assembly, the filter ring achieves outer layer filtration, and the filter frame achieves anti-clogging filtration, forming a two-stage filtration system.

Description

Technical Field

[0001] This utility model relates to the field of water supply equipment technology, and in particular to a pressure boosting and water replenishment device. Background Technology

[0002] The booster pump water supply system is an integrated device that combines water filtration, storage, pressurization, and replenishment functions. It is widely used in residential secondary water supply systems, industrial circulating water systems, HVAC water supply, and fire-fighting water supply. Its core function is to store water in a tank, remove impurities (such as sediment, rust, and suspended solids) through a filtration system, and then pressurize and deliver the treated water to the user's end or system loop using a booster pump. Simultaneously, a level sensor monitors the water level in the tank in real time, enabling automatic water replenishment to ensure stable water pressure and sufficient water volume. This device can replace the traditional decentralized water supply solution of "water tank + booster pump," reducing equipment footprint and improving water supply efficiency and water quality safety. It is one of the key pieces of equipment in modern water supply systems.

[0003] However, existing booster water supply devices have significant shortcomings in practical use.

[0004] On the one hand, the filtration effect is poor and it is easy to clog. After long-term use, the filter screen is easily clogged due to the accumulation of impurities, requiring frequent shutdowns for disassembly and cleaning, which not only affects the continuity of water supply but also increases maintenance costs. Furthermore, some devices lack water flow disturbance structures, making it easy for impurities to adhere to the filter screen surface, further aggravating the clogging problem.

[0005] On the other hand, the automation level is low. Traditional devices often use independent control for water replenishment and pressurization. When the level sensor detects a low water level, it only activates the water replenishment solenoid valve and cannot coordinate the adjustment of the filtration and pressurization links. This can easily lead to water pressure fluctuations caused by "replenishing water and pressurizing at the same time". Utility Model Content

[0006] In view of the shortcomings of the prior art, this utility model provides a pressurized water supply device, which overcomes the shortcomings of the prior art and effectively solves the problems of poor filtration effect, easy clogging and low degree of automation in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A pressurized water supply device includes a water tank. A filter mechanism is fixed to one inner wall of the water tank. The filter mechanism includes a drive assembly and a filter assembly. The drive assembly includes a mounting plate, a fixing plate welded to the bottom of one outer wall of the mounting plate, a connecting plate welded to the top of one outer wall of the mounting plate, and an impeller disposed between the connecting plate and the fixing plate. The filter assembly includes a circular groove, an octagonal frame welded to the bottom of the circular groove, and partitions welded at equal intervals along a ring between the outer wall of the octagonal frame and the annular inner wall of the circular groove. The water tank consists of filter rings inserted at equal intervals along the ring at the bottom of the circular groove, filter frames inserted at equal intervals along the ring at the inner wall of the octagonal frame, a conical bucket welded and fixed to the bottom of the octagonal frame, and a connecting pipe welded and fixed to the bottom of the conical bucket. A booster pump is installed and fixed at the bottom of the water tank, and one end of the booster pump's outlet is connected to one end of a water outlet pipe inserted and fixed to the bottom of the outer wall of one side of the water tank. A liquid level sensor is installed and fixed on one side of the top of the water tank, and a cover plate is hinged to the other side of the top of the water tank. A water inlet pipe is inserted and fixed to the top of the cover plate.

[0009] Furthermore, the top of one side of the outer wall of the mounting plate is provided with symmetrically distributed mounting holes, and the mounting plate is fixed to one side of the inner wall of the water tank by bolts.

[0010] The mounting holes are fitted with bolts to ensure a secure connection between the mounting plate and the inner wall of the water tank, providing strong resistance to water flow impact and preventing the filter mechanism from shifting under the action of water flow.

[0011] Furthermore, a rotating shaft is fixed to the bottom of the impeller, and a connecting rod is fixed to the top of the impeller. The bottom end of the rotating shaft is rotatably connected to the fixed plate, and the top end of the connecting rod is rotatably connected to the connecting plate.

[0012] The rotating shaft and the fixed plate, as well as the connecting rod and the connecting plate, are all rotatably connected by deep groove ball bearings, which reduces rotational friction and ensures that the impeller rotates flexibly under the action of water flow, thereby realizing water flow disturbance.

[0013] Furthermore, the connecting pipe is rotatably connected to the connecting plate, and the outer wall of the connecting pipe and the outer wall of the connecting rod are both fitted with meshing gears.

[0014] Gear transmission ensures that the impeller rotates synchronously, driving the connecting pipe and filter assembly to rotate, enhancing the contact effect between the water flow and the filter medium, and improving filtration efficiency.

[0015] Furthermore, the number of partitions is eight, and the end of the partition away from the inner wall of the circular groove is welded and fixed to the corner of the octagonal frame. There is a socket at the bottom of the circular groove between two adjacent partitions. The socket and the bottom of the outer wall of the filter ring are connected. The outer wall of the octagonal frame is provided with a socket along the circumference to connect with the octagonal frame.

[0016] Eight partitions divide the circular groove into eight independent filtration chambers. The filter ring and filter frame respectively achieve outer and inner layer filtration, forming a multi-stage filtration structure and improving the impurity removal rate.

[0017] Furthermore, an overflow hole is provided at the bottom of the circular groove, and the inner wall of the overflow hole is welded and fixed to the top of the annular outer wall of the conical bucket. The outer diameter of the overflow hole is smaller than the inner diameter of the octagonal frame.

[0018] The overflow hole ensures that the filtered water flows quickly into the conical hopper, avoiding stagnation in the circular trough, and at the same time preventing unfiltered water from entering the water tank directly, thus ensuring the filtration effect.

[0019] Furthermore, the water inlet pipe is equipped with a solenoid valve, and the bottom of the water inlet pipe is located directly above one of the filter rings.

[0020] The solenoid valve is electrically connected to the liquid level sensor to achieve automatic water replenishment; the water inlet pipe is aligned with the filter ring to ensure that the water flow directly into the filter assembly when replenishing water, avoiding unfiltered water from mixing into the water tank.

[0021] The beneficial effects of this utility model are as follows:

[0022] 1. Excellent filtration effect and strong anti-clogging ability: Through multi-stage filtration and water flow disturbance design, it solves the problems of poor filtration and easy clogging of traditional devices. In the eight independent filter chambers of the filter component, the filter ring achieves outer layer filtration and the filter frame achieves anti-clogging filtration, forming a two-stage filtration. The impeller of the drive component rotates under the action of water flow, and drives the filter component to rotate synchronously through gear transmission. After one of the filter rings is clogged, it is rotated and replaced, reducing the adhesion of impurities and clogging. The clogging cycle is greatly extended, the maintenance frequency is reduced, and the continuity of water supply is guaranteed.

[0023] 2. High degree of automation: Relying on liquid level sensors and linkage control, it improves the situation of low automation and high energy consumption of traditional devices. The liquid level sensor monitors the water level in real time. When the water level is low, the inlet pipe solenoid valve and filter components are activated simultaneously. When the water level is high, the water supply is automatically shut off. The entire water supply-filtration-pressurization process does not require manual intervention, and the degree of automation is significantly improved. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the internal structure of the water tank of the pressurization and water replenishment device proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the filter mechanism structure of a pressurized water supply device proposed in this utility model;

[0026] Figure 3 This is a schematic diagram of the drive component structure of a pressurized water supply device proposed in this utility model;

[0027] Figure 4This is a schematic diagram of the filter assembly structure of a pressurized water supply device proposed in this utility model.

[0028] In the diagram: 1. Water tank; 2. Filtration mechanism; 3. Drive assembly; 4. Filtration assembly; 5. Mounting plate; 6. Fixing plate; 7. Connecting plate; 8. Impeller; 9. Shaft; 10. Connecting rod; 11. Circular groove; 12. Octagonal frame; 13. Partition plate; 14. Filter ring; 15. Filter frame; 16. Conical hopper; 17. Connecting pipe; 18. Booster pump; 19. Outlet pipe; 20. Liquid level sensor; 21. Cover plate; 22. Inlet pipe. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] Example:

[0031] Reference Figure 1-4 A pressurized water supply device includes a water tank 1. A filter mechanism 2 is fixed to one inner wall of the water tank 1. The filter mechanism 2 includes a drive assembly 3 and a filter assembly 4. The drive assembly 3 includes a mounting plate 5, a fixing plate 6 welded and fixed to the bottom of the outer wall of one side of the mounting plate 5, a connecting plate 7 welded and fixed to the top of the outer wall of one side of the mounting plate 5, and an impeller 8 disposed between the connecting plate 7 and the fixing plate 6. The filter assembly 4 includes a circular groove 11, an octagonal frame 12 welded and fixed to the bottom of the circular groove 11, and partitions 13 welded and fixed at equal intervals along the ring between the outer wall of the octagonal frame 12 and the annular inner wall of the circular groove 11. The filter rings 14 are inserted at equal intervals into the bottom of the circular groove 11; the filter frames 15 are inserted at equal intervals along the ring into the inner wall of the octagonal frame 12; the conical bucket 16 is welded and fixed to the bottom of the octagonal frame 12; the connecting pipe 17 is welded and fixed to the bottom of the conical bucket 16; a booster pump 18 is installed and fixed at the bottom of the water tank 1; one end of the water outlet of the booster pump 18 is connected to one end of the water outlet pipe 19 which is inserted and fixed to the bottom of the outer wall of one side of the water tank 1; a liquid level sensor 20 is installed and fixed on one side of the top of the water tank 1; a cover plate 21 is hinged to the other side of the top of the water tank 1; and a water inlet pipe 22 is inserted and fixed to the top of the cover plate 21.

[0032] The top of one side of the outer wall of the mounting plate 5 has symmetrically distributed mounting holes. The mounting plate 5 is fixed to the inner wall of one side of the water tank 1 by bolts. The mounting holes are 10mm in diameter round holes, which are compatible with M8×25 bolts. This ensures that the mounting plate 5 is firmly connected to the inner wall of the water tank 1, has strong resistance to water flow impact, and prevents the filter mechanism 2 from shifting under the action of water flow. The bottom of the impeller 8 is fixed with a rotating shaft 9, and the top of the impeller 8 is fixed with a connecting rod 10. The bottom end of the rotating shaft 9 is rotatably connected to the fixed plate 6, and the top end of the connecting rod 10 is rotatably connected to the connecting plate 7. The rotating shaft 9 is connected to the fixed plate 6 and the connecting rod 10. Both the connecting plate 10 and the connecting tube 10 are rotatably connected by deep groove ball bearings to reduce rotational friction and ensure that the impeller 8 rotates flexibly under the action of water flow, thereby achieving water flow disturbance. The connecting tube 17 is rotatably connected to the connecting plate 7. The outer wall of the connecting tube 17 and the outer wall of the connecting tube 10 are fitted with meshing gears with a gear transmission ratio of 1:1. This ensures that when the impeller 8 rotates, it synchronously drives the connecting tube 17 and the filter assembly 4 to rotate, enhancing the contact effect between the water flow and the filter medium and improving the filtration efficiency. There are eight baffles 13. The end of the baffle 13 away from the annular inner wall of the circular groove 11 is respectively The filter ring 14 is fixed to the corners of the octagonal frame 12 by welding. Each adjacent partition 13 has a insertion hole at the bottom of the circular groove 11. The insertion hole and the bottom of the annular outer wall of the filter ring 14 form a plug-in fit. The outer wall of the octagonal frame 12 has a circumferential opening that forms a plug-in fit with the octagonal frame 12. The eight partitions divide the circular groove 11 into eight independent filter chambers. The filter ring 14 and filter frame 15 respectively achieve outer and inner layer filtration, forming a multi-stage filtration structure to improve the impurity removal rate. An overflow hole is provided at the bottom of the circular groove 11. The inner wall of the overflow hole and the annular outer wall of the conical hopper 16 form a plug-in fit. The top of the wall is welded and fixed. The outer diameter of the overflow hole is smaller than the inner diameter of the octagonal frame 12. The overflow hole ensures that the filtered clean water flows quickly into the conical bucket 16, avoiding stagnation in the circular groove 11. At the same time, it prevents unfiltered water from directly entering the water tank 1, ensuring the filtration effect. The water inlet pipe 22 is equipped with a solenoid valve. The bottom of the water inlet pipe 22 is located directly above one of the filter rings 14. The solenoid valve is electrically connected to the liquid level sensor 20 to realize automatic water replenishment. The water inlet pipe 22 is aligned with the filter ring 14 to ensure that the water flow directly enters the filter assembly 4 when replenishing water, avoiding unfiltered water from mixing into the water tank 1.

[0033] For the water tank and foundation structure: Water tank 1 is made of food-grade 304 stainless steel plate (thickness 2.0-2.5mm), welded by argon arc welding, with overall dimensions (length × width × height) of 1500 × 800 × 1200mm and an effective volume of 1.2m³. 3The inner wall is polished (roughness Ra≤0.8μm) to avoid secondary water pollution. A liquid level sensor 20 (submersible liquid level transmitter, measuring range 0-1.2m, accuracy ±0.5%FS) is installed on one side of the top of the water tank 1 via a bracket. The sensor probe extends to 200mm from the bottom of the water tank 1 to monitor water level changes in real time. The cover plate 21 (3mm thick stainless steel plate) is hinged to the other side of the top and fixed to the water tank 1 by a buckle. It can be opened for internal maintenance. The water inlet pipe 22 (50mm diameter stainless steel pipe) inserted into the top of the cover plate 21 is equipped with a DN50 solenoid ball valve (working pressure 0.8-1.6MPa, response time ≤0.3 seconds). The solenoid valve and the liquid level sensor 20 are linked through a PLC controller to realize automatic water replenishment.

[0034] For the installation and drive components of the filter mechanism: The mounting plate 5 of the filter mechanism 2 is made of 5mm thick stainless steel plate (300×400mm). Two 10mm diameter mounting holes are opened on the top of one side of the outer wall. It is fixed to the inner wall of one side of the water tank 1 (300mm from the top) with M8×25 stainless steel bolts. The bolt spacing is 150mm to ensure a firm installation. The fixing plate 6 (100×80×5mm) welded to the bottom of one side of the outer wall of the mounting plate 5 is parallel to the connecting plate 7 (100×80×5mm) welded to the top, with a spacing of 200mm. Bearing holes are opened in the center of both to install deep groove ball bearings (model 6204) to support the impeller. The impeller 8 is made of stainless steel (150mm in diameter, 6 blades) with an arc-shaped blade design. When water flows through, it can generate sufficient torque to drive the impeller to rotate. The shaft 9 (12mm in diameter) and the connecting rod 10 (10mm in diameter) are welded and fixed to the bottom and top of the impeller 8, respectively. Their axes coincide to ensure that there is no eccentricity when rotating. The top of the connecting pipe 17 (40mm in diameter stainless steel pipe) is rotatably connected to the connecting plate 7 through a bearing. The outer wall of the impeller 8 and the outer wall of the connecting rod 10 are fitted with spur gears of module 2 (20 teeth). The gear meshing backlash is ≤0.1mm and the transmission efficiency is ≥96%, realizing the synchronous rotation of the impeller 8 and the connecting pipe 17.

[0035] For the filter assembly and water flow guiding section: The circular groove 11 of the filter assembly 4 is made of stainless steel (diameter 250mm, height 150mm). The octagonal frame 12 (side length 50mm, height 120mm) welded to the bottom is fixed to the inner wall of the circular groove 11 by eight partitions 13 (thickness 3mm stainless steel plate). The partitions 13 are evenly distributed along the ring, dividing the circular groove 11 into eight independent filter chambers. Each filter chamber has an 80mm diameter insertion hole at the bottom. The inserted filter ring 14 (outer diameter 80mm, inner diameter 60mm, height 120mm) is made of stainless steel woven mesh (pore size 10-15μm), which can intercept suspended solids in the water. The octagonal frame 12... Eight insertion ports are opened in a ring along the wall. The filter frame 15 (40mm side length, 120mm height) is made of PP cotton filter element (pore size 5-8μm). Both the filter frame 15 and the filter ring 14 can be removed and replaced separately, making maintenance convenient. The bottom of the circular groove 11 has an overflow hole with a diameter of 60mm, which is welded to the top of the conical bucket 16 (made of stainless steel, 100mm high, 60mm upper diameter, 40mm lower diameter). The bottom of the conical bucket 16 is welded to the connecting pipe 17 to form a guide channel for the filtered water flow. The bottom of the connecting pipe 17 extends to 100mm from the bottom of the water tank 1 to ensure that the filtered clean water flows directly into the bottom of the water tank 1 and avoids mixing with the unfiltered water.

[0036] For the pressurization and water outlet sections: A booster pump 18 (model: horizontal multistage centrifugal pump, rated flow: 2m³ / h) is installed at the bottom of water tank 1 via a bracket. 3 The pump body is made of stainless steel to prevent rust and water pollution. A Y-type filter (1mm aperture) is installed at the inlet of the booster pump 18 to prevent impurities from entering the pump body and causing damage. The outlet is connected to the outlet pipe 19 (40mm diameter stainless steel pipe) via a flexible hose. A pressure sensor (diffuse silicon pressure transmitter, measurement range 0-1.0MPa) is installed on the outlet pipe 19. The pressure signal is fed back to the PLC controller, which controls the booster pump 18 to operate using variable frequency (1.5kW vector frequency converter). When the pressure in the outlet pipe 19 is lower than the set value (e.g., 0.4MPa), the pump speed is increased; when the pressure is higher than the set value (e.g., 0.6MPa), the speed is reduced to achieve constant pressure water supply and reduce energy waste. The outlet pipe 19 extends to the outside of the water tank 1, and a check valve and gate valve are installed at the end to prevent backflow and facilitate maintenance.

[0037] Working principle:

[0038] Automatic water replenishment and filtration start-up: When the water level in the water tank 1 is lower than the set lower limit (e.g., 300mm), the level sensor 20 transmits a low water level signal to the PLC controller. The controller immediately opens the solenoid valve of the inlet pipe 22, and external water (e.g., municipal tap water) flows into the filter assembly 4 of the filter mechanism 2 through the inlet pipe 22, landing directly above one of the filter rings 14. The water flow impacts the surface of the filter ring 14, and some water flows through the mesh of the filter ring 14 into the water tank 1. When the filter ring 14 is blocked, the water flow through the filter frame 15 rotates the impeller 8 of the drive assembly 3 below (the impeller blades generate torque due to the impact of the water flow); the impeller 8 drives the top gear to rotate through the rotating shaft 9 and the connecting rod 10. This gear drives the gear on the outer wall of the connecting pipe 17 to rotate synchronously, thereby driving the entire filter assembly 4 to rotate, so that the eight filter chambers are aligned and replaced with the inlet pipe 22 in sequence, realizing continuous filtration of the water flow.

[0039] Boosted water supply and constant pressure control: When a water terminal (such as a household or appliance) opens its valve, the pressure in the outlet pipe 19 drops. The pressure sensor transmits a signal to the controller, which then starts the booster pump 18 and adjusts the pump speed based on the pressure feedback: if the pressure drops rapidly (high water consumption), the speed is increased to the rated speed (2900 r / min) to increase the water supply; if the pressure drops slowly (low water consumption), the speed is reduced (e.g., 1000-2000 r / min) to reduce energy consumption. The booster pump 18 pressurizes the clean water in the water tank 1 and delivers it to the water terminal through the outlet pipe 19, maintaining a stable outlet pressure of 0.4-0.6 MPa. When the water level in tank 1 reaches the set upper limit (e.g., 1000mm), the level sensor 20 sends a high water level signal, the controller closes the solenoid valve of the inlet pipe 22, stops water replenishment, and the filter assembly 4 stops rotating as the water flow stops; if the water level continues to drop to the lower limit, the water replenishment process is restarted to achieve a cycle of "water replenishment-filtration-pressurization" to ensure stable water supply and water quality safety.

[0040] Maintenance and Filter Replacement: After 90-120 days of equipment operation, open the cover 21 of water tank 1, remove the filter ring 14 in the circular groove 11 and the filter frame 15 in the octagonal frame 12, replace with new filter media, check the gear meshing and bearing wear, and replace any damaged parts promptly. After maintenance, the equipment can continue to operate. The entire maintenance process is simple and convenient, and can be completed by one person in 1-2 hours, significantly reducing maintenance costs.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pressurized water replenishing device comprising a water tank (1), characterized in that, A filter mechanism (2) is fixed to one inner wall of the water tank (1), and the filter mechanism (2) includes a drive assembly (3) and a filter assembly (4). The drive assembly (3) includes a mounting plate (5), a fixing plate (6) welded and fixed to the bottom of the outer wall of one side of the mounting plate (5), a connecting plate (7) welded and fixed to the top of the outer wall of one side of the mounting plate (5), and an impeller (8) disposed between the connecting plate (7) and the fixing plate (6). The filter assembly (4) includes a circular groove (11), an octagonal frame (12) welded and fixed to the bottom of the circular groove (11), a partition (13) welded and fixed at equal intervals along the ring between the outer wall of the octagonal frame (12) and the inner wall of the circular groove (11), and a circumferentially inserted at equal intervals along the ring. The filter ring (14) at the bottom of the circular groove (11), the filter frame (15) inserted at equal intervals along the ring into the inner wall of the octagonal frame (12), the conical bucket (16) welded and fixed to the bottom of the octagonal frame (12), and the connecting pipe (17) welded and fixed to the bottom of the conical bucket (16), the bottom of the water tank (1) is equipped with a booster pump (18), and one end of the water outlet of the booster pump (18) is connected to one end of the water outlet pipe (19) inserted and fixed to the bottom of the outer wall of one side of the water tank (1), a liquid level sensor (20) is installed and fixed on one side of the top of the water tank (1), and a cover plate (21) is hinged to the other side of the top of the water tank (1), and an inlet pipe (22) is inserted and fixed to the top of the cover plate (21).

2. The pressurized water replenishing device according to claim 1, wherein The top of one side of the mounting plate (5) has symmetrically distributed mounting holes, and the mounting plate (5) is fixed to one side of the inner wall of the water tank (1) by bolts.

3. The pressurized water replenishing device according to claim 1, wherein The impeller (8) has a rotating shaft (9) fixed at its bottom and a connecting rod (10) fixed at its top. The bottom end of the rotating shaft (9) is rotatably connected to the fixed plate (6), and the top end of the connecting rod (10) is rotatably connected to the connecting plate (7).

4. The pressurized water replenishing device according to claim 3, wherein The connecting pipe (17) is rotatably connected to the connecting plate (7), and the outer wall of the connecting pipe (17) and the outer wall of the connecting rod (10) are both fitted with meshing gears.

5. The pressurized water replenishing device according to claim 1, wherein The number of partitions (13) is eight, and the end of the partition (13) away from the annular inner wall of the circular groove (11) is welded and fixed to the corner of the octagonal frame (12). There are insertion holes in the bottom of the circular groove (11) between two adjacent partitions (13). The insertion holes and the bottom of the annular outer wall of the filter ring (14) are connected in a plug-in fit. The outer wall of the octagonal frame (12) is provided with a plug-in opening along the annular shape to connect with the octagonal frame (12).

6. The pressurized water replenishing device according to claim 1, wherein The bottom of the circular groove (11) is provided with an overflow hole, and the inner wall of the overflow hole is welded and fixed to the top of the annular outer wall of the conical bucket (16). The outer diameter of the overflow hole is smaller than the inner diameter of the octagonal frame (12).

7. The pressurized water replenishing device according to claim 1, wherein The water inlet pipe (22) is equipped with a solenoid valve, and the bottom of the water inlet pipe (22) is located directly above one of the filter rings (14).

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