A toilet tank refill structure with backflow prevention

Abstract

This utility model discloses a toilet tank water replenishment structure with anti-backflow, including a tank shell and a flushing assembly. The flushing assembly includes a water replenishment valve assembly, which has a valve chamber. The lower part of the valve chamber is connected to one end of the water pump inlet channel, one side of the valve chamber is connected to a water replenishment inlet channel, and the upper side of the valve chamber is connected to a down-flush channel. A first one-way valve and a second one-way valve are provided in the valve chamber. When the toilet is flushed, water flows into the valve chamber from the water pump inlet channel and the water replenishment inlet channel. The water flow can push upwards against the first one-way valve and the second one-way valve and enter the down-flush channel. When flushing stops and water is replenished, the water pump stops working, and water flows only into the valve chamber from the water replenishment inlet channel. The water flow can push upwards against the first one-way valve and enter the down-flush channel. At this time, the second one-way valve blocks the water pump inlet channel, preventing water from flowing back into the water pump inlet channel during the replenishment process.

Description

Technical Field

[0001] This utility model relates to the field of toilet technology, and in particular to a toilet tank water replenishment structure with anti-backflow. Background Technology

[0002] The flushing process of a toilet typically includes a flushing step and a refilling step. When flushing, clean water in the tank is released by a water pump to flush away the waste in the toilet bowl and discharge it into the sewage pipe. When refilling, a thin stream of water is added to the toilet bowl to re-establish the "water seal" (i.e., the water trapped in the trap) and prevent odors from the sewage pipe from flowing back into the room.

[0003] In existing technologies, a valve chamber is typically provided. The inlet of the valve chamber is connected to the water inlet channel driven by the water pump, and the water replenishment channel is also connected to the valve chamber. The outlet of the valve chamber is connected to the overflow pipe above the toilet bowl or a dedicated water replenishment port through a pipe. This design, which merges the water pump inlet channel and the water replenishment channel in the valve chamber, usually causes the water in the valve chamber to flow back to the lower-pressure water pump inlet channel under the action of the water source pressure when the flushing step ends, the water pump stops working, and the system enters a single water replenishment step. Instead of all flowing to the preset water replenishment outlet leading to the toilet bowl, the water in the valve chamber will flow back to the lower-pressure water pump inlet channel under the action of the water source pressure.

[0004] This backflow phenomenon has many adverse consequences: it directly reduces the amount of water added to the toilet, resulting in insufficient water seal height and potential hygiene hazards; the backflowing water may enter the water pump, reducing efficiency or even causing damage; and the water replenishment is wasted, which is not energy-efficient or environmentally friendly. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a toilet tank water replenishment structure with anti-backflow function, which has good anti-backflow function and is relatively simple and reliable in structure.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0007] A toilet tank water replenishment structure with anti-backflow feature is characterized by comprising a water tank shell and a flushing assembly disposed within the water tank shell; the flushing assembly includes a water replenishment valve assembly, wherein a valve cavity is formed within the water replenishment valve assembly, the lower end of the valve cavity is connected to one end of a water pump inlet channel, one side of the valve cavity is connected to a water replenishment inlet channel, and the upper side of the valve cavity is connected to a lower flushing channel.

[0008] The valve chamber is provided with a first check valve that can move up and down along the valve chamber, and a second check valve that can move up and down between the valve chamber and the water pump inlet channel. The water supply inlet channel is located above the second check valve at the horizontal position of the outlet of the water supply inlet channel in the valve chamber. The valve chamber, the first check valve and the second check valve are all arranged vertically.

[0009] The water flow in the valve chamber can push upwards against the first one-way valve and flow into the lower flushing channel, while the water flow in the water pump inlet channel can push upwards against the second one-way valve and flow into the valve chamber.

[0010] The water tank shell is also equipped with a water inlet valve assembly, and the water inlet valve assembly is equipped with a water supply pipe that is connected to the water supply channel.

[0011] The first one-way valve includes a plugging disc and a sealing ring located at the upper part that can fit against the inner wall of the valve cavity; the lower part of the first one-way valve is configured as a cylinder, a hollow installation channel is formed in the middle of the first one-way valve, and an installation post that can cooperate with the installation channel is provided at the top of the inner side of the valve cavity.

[0012] A spring is provided between the top of the valve chamber and the top of the first one-way valve. The spring is sleeved on the outside of the mounting post, and the lower end of the spring abuts against the upper end of the blocking disc.

[0013] The inner wall of the valve cavity is provided with a guide groove, and the cylinder of the first one-way valve is provided with guide fins around it that can cooperate with the guide groove.

[0014] The flushing assembly also includes a water pump, a main flushing channel connected to the water pump, and an upper flushing channel connected to the main flushing channel; the other end of the water pump inlet channel can also be connected to the main flushing channel.

[0015] The main flushing channel is equipped with a flushing switching chamber, and the other end of the upper flushing channel and the water pump inlet channel can be connected to the flushing switching chamber.

[0016] A switching block is provided inside the flushing switching chamber, and one side of the switching block is hinged to the inner wall of the flushing switching chamber; when the switching block rotates, it can block the water flow between the main flushing channel and the upper flushing channel or block the water flow between the main flushing channel and the water pump inlet channel.

[0017] A float is provided on the outside of the flushing switching chamber. One end of the float is rigidly connected to one side of the switching block, so that one end of the float is hinged to the flushing switching chamber. When the water level in the water tank changes, the float can drive the switching block to rotate.

[0018] The water tank shell also includes a top cover, the water inlet valve assembly also includes a water inlet interface, and the flushing assembly also includes an upper flushing channel; the top cover is provided with a water inlet interface, a lower flushing channel, and an upper flushing channel outlet.

[0019] The beneficial effects of this utility model are:

[0020] 1. During the flushing process, water flows into the valve chamber from the pump inlet and the replenishment inlet. This water flows upwards, pushing against the first and second check valves and entering the flushing channel. When the flushing stops and the toilet is refilled, the pump stops working, and water flows only into the valve chamber from the replenishment inlet. This water flows upwards, pushing against the first check valve and entering the flushing channel. At this time, the second check valve falls downwards due to gravity, blocking the pump inlet and preventing backflow of water from the replenishment process. During the flushing process, water flows in from both the pump inlet and the replenishment inlet, increasing the flushing pressure and ensuring a strong flush. Furthermore, the first check valve is also arranged vertically. When there is no water in the valve chamber, the first check valve moves downwards under gravity, blocking the valve chamber and, together with the second check valve, preventing backflow of water from the flushing channel.

[0021] 2. During the flushing process, two water sources converge simultaneously. One flow comes from the replenishment inlet channel, while the other comes from the operating water pump. The pump's inlet water flows upwards through the pump's inlet channel, opening the second one-way valve before entering the valve chamber. The two flows merge within the valve chamber, together pushing upwards to open the first one-way valve, allowing them to enter the flushing channel with greater flow and pressure. This significantly increases the initial kinetic energy and flushing power of the flush, improving the overall flushing performance of the toilet.

[0022] 3. The first and second check valves are arranged vertically, which cleverly utilizes the longitudinal space of the valve cavity, making the entire water supply valve assembly very compact and easy to install and arrange inside the water tank, saving space.

[0023] 4. The anti-backflow function and dual-flow merging function are integrated into a compact water replenishment valve assembly. Combined with the linkage mechanism consisting of the float and the switching block, the flushing mode (such as top flushing / bottom flushing) can be automatically switched according to the water level in the tank, and the anti-backflow function is automatically implemented throughout the water replenishment process. No manual intervention is required from the user. It has a high degree of intelligence and a good user experience. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the exploded structure of the toilet tank;

[0025] Figure 2 This is a structural diagram of the flushing assembly and the inlet valve assembly;

[0026] Figure 3 This is a schematic diagram of the flushing assembly in the top flushing state;

[0027] Figure 4 This is a cross-sectional schematic diagram of the flushing assembly in the top flushing state;

[0028] Figure 5This is a schematic diagram of the flushing assembly in the down-flush mode;

[0029] Figure 6 This is a cross-sectional schematic diagram of the flushing assembly in the down-flush state;

[0030] Figure 7 This is a cross-sectional schematic diagram of the flushing assembly in the water replenishment state;

[0031] Figure 8 This is a schematic diagram of the structure inside the valve cavity;

[0032] Figure 9 This is a schematic diagram of the structure of the first check valve and the second check valve. Detailed Implementation

[0033] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0034] Reference Figures 1-3 This utility model proposes a toilet tank water replenishment structure with anti-backflow, including a water tank shell 1 and a flushing assembly 3 disposed in the water tank shell 1; the flushing assembly 3 includes a water replenishment valve assembly 30, a valve cavity 301 is formed in the water replenishment valve assembly 30, the lower end of the valve cavity 301 is connected to one end of the water pump inlet channel 33, one side of the valve cavity 301 is connected to a water replenishment inlet channel 200, and the upper side of the valve cavity 301 is connected to a lower flushing channel 300;

[0035] Reference Figure 4 The valve chamber 301 is provided with a first check valve 302 that can move up and down along the valve chamber 301, and a second check valve 304 that can move up and down between the valve chamber 301 and the water pump inlet channel 33. The water supply inlet channel 200 is located above the second check valve 304 at the horizontal position of the outlet 201 of the water supply inlet channel 200 in the valve chamber 301.

[0036] The water flow in valve chamber 301 can push upwards against the first check valve 302 and flow into the lower flushing channel 300, while the water flow in pump inlet channel 33 can push upwards against the second check valve 304 and flow into valve chamber 301.

[0037] Furthermore, one end of the water pump inlet channel 33 is a vertically arranged vertical inlet channel 330, and the valve chamber 301 is connected to the vertical inlet channel 330 below. The second one-way valve 304 is located between the vertical inlet channel 330 and the valve chamber 301.

[0038] Specifically, when the toilet is flushing, water flows into the valve chamber 301 from the water pump inlet channel 33 and the water replenishment inlet channel 200. The water flow can push upwards against the first one-way valve 302 and the second one-way valve 304 and enter the flushing channel 300. When the flushing stops and the toilet is replenished, the water pump 4 stops working, and the water flow only enters the valve chamber 301 from the water replenishment inlet channel 200. Since the outlet 201 of the water replenishment inlet channel 200 in the valve chamber 301 is located above the second one-way valve 304, the water flow can push upwards against the first one-way valve 302 and enter the flushing channel 300. At this time, the second one-way valve 304 falls downwards due to gravity, blocking the water pump inlet channel 33 and preventing the water flow during the replenishment process from flowing back into the water pump inlet channel 33. During the down-flush step, water flows in from both the water pump inlet channel 33 and the makeup water inlet channel 200, increasing the flushing pressure and ensuring flushing force. Furthermore, the first check valve 302 is also arranged vertically. When there is no water flow in the valve chamber, the first check valve 302 can also move downward under the action of gravity, blocking the valve chamber. Together with the second check valve 304, this ensures that water cannot flow back from the down-flush channel 300.

[0039] Reference Figure 2 The water tank housing 1 is also equipped with an inlet valve assembly 2, and the inlet valve assembly 2 is equipped with a water supply pipe 20 that is connected to the water supply channel 200.

[0040] Furthermore, the water supply to the replenishment inlet channel 200 comes from the inlet valve assembly 2. During the flushing process, two water sources converge simultaneously. One water flow comes from the replenishment inlet channel 200, and the other comes from the operating water pump 4. This water flow passes through the water pump inlet channel 33, which pushes upward to open the second one-way valve 304 before entering the valve chamber 301. The two water flows merge within the valve chamber 301, together pushing upward to open the first one-way valve 302, and then enter the flushing channel 300 with greater flow rate and pressure. This significantly increases the initial kinetic energy and flushing force of the flush, improving the overall flushing performance of the toilet.

[0041] Refer to Figure 4 , Figure 9 The first one-way valve 302 includes a plugging disc 3020 and a sealing ring 3021 located at the upper part that can fit against the inner wall of the valve cavity 301; the lower part of the first one-way valve 302 is configured as a cylinder 3022, and a hollow mounting channel 3024 is formed in the middle of the first one-way valve 302. A mounting post 3010 that can cooperate with the mounting channel 3024 is provided on the top of the inner side of the valve cavity 301.

[0042] Preferably, a spring 303 is provided between the top of the valve cavity 301 and the top of the first one-way valve 302. The spring 303 is sleeved on the outside of the mounting post 3010, and the lower end of the spring 303 abuts against the upper end of the blocking disc 3020.

[0043] Reference Figure 9 The inner wall of the valve cavity 301 is provided with a guide groove 3011, and the cylinder 3022 of the first one-way valve 302 is provided with guide fins 3023 that can cooperate with the guide groove 3011.

[0044] Specifically, a spring 303 provides a stable reset force for the first check valve 302, and the cooperation between the guide fin 3023 and the guide groove 3011 ensures that the first check valve 302 can only move vertically up and down, avoiding lateral deviation or jamming, making its opening and closing actions more precise and reliable. The opening and closing of the second check valve 304 is entirely controlled by water flow pressure and gravity, requiring no additional power, resulting in a simple structure and low failure rate. This effectively prevents water backflow into the water pump, avoiding potential efficiency reduction and damage to the pump, and extending the service life of the pump and related components.

[0045] Furthermore, the first check valve 302 and the second check valve 304 are arranged vertically, which cleverly utilizes the longitudinal space of the valve cavity 301, making the structure of the entire water supply valve assembly 30 very compact, which is convenient for installation and layout inside the water tank and saves space.

[0046] In one implementation, when there is no water flow, the valve body 302 can move downwards by gravity to achieve the blocking effect. The spring 303 and the mounting post 3010 do not need to be set on the top of the valve body 302, which makes the structure simpler and less prone to jamming.

[0047] Reference Figure 8 Furthermore, a vent 305 communicating with the outside is provided inside the valve chamber 301. The vent 305 ensures that the pressure inside the valve chamber 301 remains balanced with atmospheric pressure, effectively disrupting the sealed environment and pressure difference conditions created by the siphon effect. This fundamentally prevents wastewater in the toilet bowl from being drawn back into the clean water tank through the flushing channel 300 when water replenishment is complete or when system pressure is abnormal, completely avoiding the risk of cross-contamination and greatly improving the product's hygiene, safety, and reliability. This design is simple in structure, requires no additional anti-siphon valve, is low in cost, and yields significant results.

[0048] Reference Figure 2 The flushing assembly 3 also includes a water pump 4, a main flushing channel 32 connected to the water pump 4, and an upper flushing channel 310 connected to the main flushing channel 32; the other end of the water pump inlet channel 33 can also be connected to the main flushing channel 32.

[0049] Reference Figure 2-4 The main flushing channel 32 is provided with a flushing switching chamber 31, and the other end of the upper flushing channel 310 and the water pump inlet channel 33 can be connected to the flushing switching chamber 31.

[0050] Reference Figure 4-6A switching block 50 is provided inside the flushing switching chamber 31. One side of the switching block 50 is hinged to the inner wall of the flushing switching chamber 31. When the switching block 50 rotates, it can block the water flow between the main flushing channel 32 and the upper flushing channel 310 or block the water flow between the main flushing channel 32 and the water pump inlet channel 33.

[0051] A float 5 is provided on the outside of the flushing switching chamber 31. One end of the float 5 is rigidly connected to one side of the switching block 50 so that one end of the float 5 is hinged to the flushing switching chamber 31. When the water level in the water tank shell 1 changes, the float 5 can drive the switching block 50 to rotate.

[0052] Specifically, the linkage mechanism consisting of the float 5 and the switching block 50 can automatically switch the flushing mode, such as top flushing or bottom flushing, according to changes in the water level in the tank. It also automatically prevents backflow throughout the entire water replenishment process, requiring no manual intervention from the user. This highly intelligent system provides a superior user experience. By eliminating backflow during water replenishment, unnecessary waste of water resources is avoided, ensuring that all replenishment water is effectively utilized, aligning with energy-saving and environmentally friendly design principles.

[0053] Reference Figure 1 The water tank shell 1 also includes a top cover 10, the water inlet valve assembly 2 includes a water inlet interface 21, and the flushing assembly 3 includes an upper flushing channel 310; the top cover 10 is provided with a water inlet interface 21, a lower flushing channel 300, and an outlet 100 for the upper flushing channel 310. Specifically, the water tank has a compact overall structure, and the various components are arranged in a reasonable and compact manner, making it suitable for placement and installation in various environments.

[0054] In summary, this utility model successfully solves the problem of backflow of water without sacrificing flushing performance, and has multiple advantages such as high-efficiency flushing, reliable sealing, compact structure, and energy saving and environmental protection.

Claims

1. A toilet tank refill structure with backflow prevention, characterized by, The system includes a water tank housing (1) and a flushing assembly (3) disposed within the water tank housing (1). The flushing assembly (3) includes a water supply valve assembly (30), which has a valve cavity (301) formed therein. The lower part of the valve cavity (301) is connected to one end of the water pump inlet channel (33), and the side of the valve cavity (301) is connected to a water supply inlet channel (200). The upper part of the valve cavity (301) is connected to a lower flushing channel (300). The valve chamber (301) is provided with a first check valve (302) that can move up and down along the valve chamber (301), and a second check valve (304) that can move up and down between the valve chamber (301) and the water pump inlet channel (33). The water supply inlet channel (200) is located above the second check valve (304) at the horizontal position of the outlet (201) in the valve chamber (301). The valve chamber (301), the first check valve (302) and the second check valve (304) are all arranged vertically. The water flow in the valve chamber (301) can push the first check valve (302) upward and flow to the lower flushing channel (300), and the water flow in the water pump inlet channel (33) can push the second check valve (304) and flow to the valve chamber (301).

2. The toilet tank refill structure with anti-refill according to claim 1, wherein, The water tank housing (1) is also provided with an inlet valve assembly (2), and the inlet valve assembly (2) is provided with a water supply pipe (20) that is connected to the water supply channel (200).

3. The toilet tank refill structure with anti-refill according to claim 1, wherein, The first one-way valve (302) includes a plugging disc (3020) and a sealing ring (3021) located at the upper part that can fit against the inner wall of the valve cavity (301); the lower part of the first one-way valve (302) is configured as a cylinder (3022), and a hollow installation channel (3024) is formed in the middle of the first one-way valve (302). An installation post (3010) that can cooperate with the installation channel (3024) is provided on the top of the inner side of the valve cavity (301).

4. The toilet tank refill structure with anti-refill according to claim 3, wherein, A spring (303) is provided between the top of the valve chamber (301) and the top of the first one-way valve (302). The spring (303) is sleeved on the outside of the mounting post (3010), and the lower end of the spring (303) abuts against the upper end of the blocking disc (3020).

5. The toilet tank refill structure with anti-refill according to claim 1, wherein, The valve chamber (301) is provided with a vent (305) that communicates with the outside.

6. A toilet tank water replenishment structure with anti-backflow feature according to claim 2, characterized in that, The flushing assembly (3) also includes a water pump (4), a main flushing channel (32) connected to the water pump (4), and an upper flushing channel (310) connected to the main flushing channel (32); the other end of the water pump inlet channel (33) can also be connected to the main flushing channel (32).

7. The toilet tank refill structure with anti-refill according to claim 6, wherein, The main flushing channel (32) is provided with a flushing switching chamber (31), and the other end of the upper flushing channel (310) and the water pump inlet channel (33) can be connected to the flushing switching chamber (31).

8. A toilet tank water replenishment structure with anti-backflow feature according to claim 7, characterized in that, A switching block (50) is provided inside the flushing switching chamber (31). One side of the switching block (50) is hinged to the inner wall of the flushing switching chamber (31). When the switching block (50) rotates, it can block the water flow between the main flushing channel (32) and the upper flushing channel (310) or block the water flow between the main flushing channel (32) and the water pump inlet channel (33).

9. A toilet tank water replenishment structure with anti-backflow feature according to claim 8, characterized in that, A float (5) is provided on the outside of the flushing switching chamber (31). One end of the float (5) is rigidly connected to one side of the switching block (50) so that one end of the float (5) is hinged to the flushing switching chamber (31). When the water level in the water tank shell (1) changes, the float (5) can drive the switching block (50) to rotate.

10. The toilet tank refill structure with anti-refill according to claim 2, wherein, The water tank shell (1) also includes a top cover (10), the water inlet valve assembly (2) also includes a water inlet interface (21), and the flushing assembly (3) also includes an upper flushing channel (310); the top cover (10) is provided with a water inlet interface (21), a lower flushing channel (300), and an outlet (100) for the upper flushing channel (310).

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