Waterway system and toilet

By employing a variable speed drive and mechanical water system in the toilet, the low-pressure and high-pressure water flow paths are automatically switched, solving the problems of large pressure loss and manual control of solenoid valve switching in existing technologies, and achieving automated, water-saving and efficient flushing effects.

CN116770946BActive Publication Date: 2026-02-03ZHEJIANG RIJING PUMP IND CO LTD
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Patent Information

Application Number
CN202310929251.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2022-07-26
Filing Date
2023-07-26
Publication Date
2026-02-03
Estimated Expiration
2043-07-26

AI Technical Summary

Technical Problem

Existing toilet flushing systems suffer from problems such as high pressure loss, incomplete flushing, and the need for manual control of solenoid valve switching.

Method used

The water system employs a variable speed drive and mechanical structure to automatically switch between low-pressure and high-pressure water flow paths. It achieves automatic water flow distribution through a water supply mechanism, a diversion mechanism, and a pipeline mechanism, including low-pressure conduction components and high-pressure conduction components, and automatically adjusts the water flow direction by utilizing water pressure differences.

Benefits of technology

It achieves automatic switching of water flow path under different water pressures, saving water resources. The structure is durable and reliable, and the flushing volume is reasonably distributed, improving the flushing effect and water-saving performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a waterway system and a closestool, and relates to the technical field of pipeline fluid control, which comprises a closestool body, a water pump for driving water flow, a shunt mechanism in communication with the water pump at one end and used for controlling the flow direction of the water flow, and a pipeline mechanism for connecting each component of the waterway system with each other, wherein the pipeline mechanism comprises an uplink flow channel in communication with the shunt mechanism at one end and with the upper end of the closestool body at the other end and used for water passing, and a downlink flow channel in communication with the shunt mechanism at one end and with the lower end of the closestool body at the other end and used for water passing. The application adopts a mechanical mechanism, so that the structural reliability is higher and execution is more convenient.
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Description

Technical Field

[0001] This invention belongs to the field of pipeline fluid control technology, specifically referring to a water system and a toilet. Background Technology

[0002] In existing technologies, pipe switching typically involves two solenoid valves, which control the flow or disconnection between different pipes. For example, a toilet's flushing system might have water flowing from a nozzle at the bottom of the toilet bowl and from nozzles around the top, extending to an opening at the bottom of the basin. A siphon bend at the rear of the basin creates a siphon effect, drawing out waste. However, this type of toilet suffers from significant pressure loss along the flushing path, resulting in inadequate cleaning and insufficient waste removal. Furthermore, programming is required to control the on / off state of the solenoid valves, allowing for either upper or lower water flow.

[0003] For example, application number 201210590244.0 discloses a water path adjustment and switching mechanism and a shower head; this shower head is internally configured with two different water paths, which can be manually switched. Generally speaking, for shower head products, when the internal water pressure is high, a slightly larger diameter water outlet is selected, and when the internal water pressure is low, a slightly smaller diameter water outlet is selected; thus maintaining a good spray intensity and achieving a better shower comfort; this switching is performed manually by the user.

[0004] Therefore, there is a need to develop a better and more convenient pipeline water flow switching system. Summary of the Invention

[0005] The purpose of this invention is to provide a water system and toilet that can automatically switch between different pressure conditions.

[0006] The objective of this invention is achieved as follows:

[0007] A waterway system, comprising:

[0008] Water supply system, which is used to drive the flow of water;

[0009] A diversion mechanism is used to control the direction of water flow, with one end connected to the water supply mechanism;

[0010] Piping mechanisms are used to connect the various components of a water system to each other.

[0011] The pipeline system includes:

[0012] The water supply mechanism is at least partially located within the diversion pre-channel;

[0013] The upward flow channel has one end connected to the diversion mechanism and the other end connected to the upper part of the toilet body to supply water; the upward flow channel has a first installation pipe section;

[0014] as well as

[0015] The downflow channel connects to the diversion mechanism at one end and leads to the lower end of the toilet body at the other end for water supply. The downflow channel has a second installation pipe section.

[0016] Preferably, the water supply mechanism includes at least a variable speed drive and a water conveying component, wherein the variable speed drive is used to drive the water conveying component to rotate;

[0017] The diversion mechanism includes:

[0018] A low-pressure conductive component, one end of which is connected to the upward flow channel, is used to allow water to flow from the low-pressure conductive component to the upward flow channel when the flow velocity in the pre-flow channel of water delivery is lower than a set value.

[0019] A high-pressure conductive component, one end of which is connected to the downstream flow channel, is used to allow water to flow from the high-pressure conductive component to the downstream flow channel when the flow velocity in the pre-diversion channel is higher than a set value.

[0020] Preferably, the low-voltage conduction component includes:

[0021] The first flow interruption part is located within the first installation pipe section. The first flow interruption part has a first water passage hole, the diameter of which is smaller than the diameter of the first installation pipe section.

[0022] The first blocking section is movably disposed within the first installation pipe section, adjacent to the diversion pre-channel.

[0023] The first blocking part has a first blocking member, the movement trajectory of which at least partially overlaps with the first flow interruption part, so that the first blocking member can achieve the opening and cutting off of the first water passage by abutting against or disengaging from the first flow interruption part.

[0024] It also includes a third flow interruption section, which closes the upstream flow channel when the water pressure is below a critical value; the first blocking member is driven by the first reset member and moves downward toward the third flow interruption section.

[0025] Preferably, the high-voltage conduction assembly includes:

[0026] The second flow interruption part is located within the second installation pipe section. The second flow interruption part has a second water passage hole, the diameter of which is smaller than the diameter of the second installation pipe section.

[0027] The second blocking section is movably disposed within the second installation pipe section, adjacent to the diversion pre-channel.

[0028] The second blocking part has a second blocking member, the movement trajectory of which at least partially overlaps with the second flow interruption part, so that the second blocking member can achieve the opening and cutting off of the second water passage by abutting against or disengaging from the second flow interruption part.

[0029] Preferably, the diversion mechanism has:

[0030] A support rod, with a first blocking component and a second blocking component connected to its two ends respectively;

[0031] The fixed end is located at the junction of the second installation pipe section and the first installation pipe section, and is rotatably connected to the support rod.

[0032] The support rod has:

[0033] The low-pressure support section has its two ends connected to the fixed end and the first blocking member, respectively.

[0034] The high-pressure support section has its two ends connected to the fixed end and the second blocking component, respectively.

[0035] Preferably, the low-pressure conducting component and the high-pressure conducting component are solenoid valves, used to electromagnetically control the opening or closing of the low-pressure conducting component and the high-pressure conducting component.

[0036] Preferably, the diversion mechanism further comprises:

[0037] A one-way channel, with its two ends respectively connecting to the downstream flow channel and the inlet section of the water supply mechanism, is used to unidirectionally guide excess water from the downstream flow channel into the inlet section.

[0038] A toilet, including the above-mentioned water system, also includes:

[0039] Toilet body; and

[0040] The water tank has two ends that connect the inlet section and the pre-diversion channel, respectively, and is used to control the pressure of pressurized water entering the water system.

[0041] The outstanding and beneficial technical effects of this invention compared to the prior art are:

[0042] 1. This invention changes the water pressure within the pipes, allowing water to flow through one pipe under low pressure and through the other under high pressure. The water pressure can be adjusted by changing the motor speed to change the flush volume. Switching between pipes is convenient and requires no additional components such as solenoid valves, making installation easy. The purely mechanical structure is also more durable. When applied to toilets, it makes the flush volume distribution more reasonable, effectively saving water resources and promoting water conservation and environmental protection.

[0043] 2. This invention uses a two-way channel, which allows water to be distributed according to the water pressure, thus saving more water.

[0044] 3. The present invention uses a mechanical mechanism in the bidirectional channel to realize the automatic distribution of water flow, which makes the structure more reliable and the execution more convenient. Attached Figure Description

[0045] Figure 1 This is a simplified structural diagram of the waterway system;

[0046] Figure 2 This is a simplified structural diagram of the toilet water system in Example 2;

[0047] Figure 3 This is a simplified structural diagram of the diversion mechanism;

[0048] Figure 4 This is a simplified structural diagram of the three-way flow mechanism in the embodiment;

[0049] Figure 5 This is a simplified structural diagram of the diversion mechanism in Embodiment 4.

[0050] In the picture:

[0051] 1-Water supply mechanism; 2-Diverting mechanism; 3-Pipeline mechanism; 4-Water tank; 5-Toilet body; 6-Control switch;

[0052] 11-Variable speed drive; 12-Water conveyance component; 21-Low pressure conduction assembly; 22-High pressure conduction assembly; 23-One-way channel; 25-Support rod; 26-Fixed end; 31-Upward flow channel; 32-Downward flow channel; 33-Inlet section; 34-Pre-diversion channel; 51-Receiving cavity; 52-Drain outlet;

[0053] 211 - First installation pipe section; 213 - First blocking section; 221 - Second installation pipe section; 222 - Second flow interruption section; 223 - Second blocking section;

[0054] 2121-First water passage hole; 2122-First flow interruption part; 2123-Third flow interruption part; 2131-First blocking element; 2221-Second water passage hole; 2231-Second blocking element.

[0055] 2032a - First elastic part; 2032b - Second elastic part. Detailed Implementation

[0056] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0057] Example 1

[0058] like Figure 1-2As shown, a water system and a toilet using the water system include a toilet body, a water supply mechanism 1, a diversion mechanism 2, a pipeline mechanism 3, a toilet body 5, a control switch 6, and a water tank 4; the pipeline mechanism includes an inlet section 33, a diversion pre-channel 34, an upward flow channel 31, and a downward flow channel 32; wherein, the inlet section 33 is used to supply external water into the water system, and the control switch 6 is used to control the opening and closing of the water inlet.

[0059] In this embodiment, the toilet flushing sequence is as follows: First, water enters the toilet's flushing pipe from the upward flow channel 31 at a low flow rate, flushing the inner wall of the toilet from top to bottom. At this time, waste will accumulate in the toilet's downward flushing pipe, which is directly connected to the sewage pipe. Then, water enters the toilet's downward flushing pipe from the downward flow channel 32 at a higher flow rate, allowing the waste to be discharged through the sewage pipe. Finally, water enters the toilet's flushing pipe from the upward flow channel 31 at a lower flow rate, thereby pre-accumulating some water in the toilet for odor and insect prevention.

[0060] Therefore, in this embodiment, water will sequentially pass through the inlet section 33, water tank 4, pre-diversion channel 34, water supply mechanism 1, and diversion mechanism 2, and then flow from the diversion mechanism 2 into the upward flow channel 31 and the downward flow channel 32. The upward flow channel 31 is connected to the upper end of the receiving cavity 51 of the toilet body 5, which can flush water from top to bottom into the drain outlet 52 of the toilet body 5. The downward flow channel 32 is connected to the lower end of the toilet body 5, which can flush the lower end of the receiving cavity 51 again through the lower end of the receiving cavity 51.

[0061] In order to control the water flow into the downflow channel 32 or the upflow channel 31, a diversion mechanism 2 is added in this embodiment. One end of the diversion mechanism 2 is connected to the water supply mechanism 1, and the other end is connected to the upflow channel 31 and the downflow channel 32 respectively. The diversion mechanism 2 includes a low-pressure conduction component 21 and a high-pressure conduction component 22. In this embodiment, the water supply mechanism 1 includes at least a variable speed driver 11 and a water conveying component 12. The variable speed driver 11 is used to drive the water conveying component 12 to rotate, and the high and low pressure of the water can be adjusted according to the needs of flushing the toilet. In this embodiment, the water conveying component 12 is a turbine and a fan blade, which can accelerate the water flow rate by high-speed rotation.

[0062] One end of the low-pressure conductive component 21 is connected to the upward flow channel 31, so that when the flow velocity in the diversion pre-channel 34 is lower than the set value, the water flows from the low-pressure conductive component 21 to the upward flow channel 31; one end of the high-pressure conductive component 22 is connected to the downward flow channel 32, so that when the flow velocity in the diversion pre-channel 34 is higher than the set value, the water flows from the high-pressure conductive component 22 to the downward flow channel 32.

[0063] like Figure 3As shown, in actual use, the low-pressure conduction component 21 is installed on the first installation pipe section 211. The low-pressure conduction component 21 includes a first flow interruption part 2122 and a first blocking part 213.

[0064] The first blocking part 213 has a first blocking member 2131 and a first elastic part 2032a. The first blocking member 2131 and the first elastic part 2032a are connected. One end of the first elastic part 2032a is disposed on the inner wall of the first installation pipe section 211. When the water flow pressure is low (the pressure of the water flow on the first blocking member 2131 is less than the elastic force of the first elastic part 2032a), the first blocking member 2131 is located in front of the first flow interruption part 2122. Through the gap between the first blocking member 2131 and the first flow interruption part 2122, water enters the pipe of the upward flow channel 31 from the first water passage 2121, so that water can be discharged from the top of the toilet, so that the water flushes the inside of the toilet from top to bottom.

[0065] When the water supply mechanism 1 increases its rotation speed, thereby increasing the water pressure, the first blocking member 2131 is subjected to a water flow pressure greater than the elastic force of the first elastic part 2032a. The first blocking member 2131 moves toward the first flow-blocking part 2122 and eventually abuts against the first flow-blocking part 2122. Since the area of ​​the first blocking member 2131 is larger than the diameter of the first water passage 2121, when the upper end face of the first blocking member 2131 abuts against the lower end face of the first flow-blocking part 2122, the first blocking member 2131 covers the diameter of the first water passage 2121, preventing water from entering the pipe of the upward flow channel 31 through the first water passage 2121.

[0066] The high-pressure conduction assembly 22 includes a second flow interruption section 222 and a second blocking section 223; the second flow interruption section 222 is located inside the second installation pipe section 221, and the second flow interruption section 222 has a second water passage hole 2221, the diameter of which is smaller than the diameter of the second installation pipe section 221; in this embodiment,

[0067] One end of the second blocking part 223 is fixed to the inner wall of the second installation pipe section 221, and the second blocking part 223 can move along the path of the second installation pipe section 221.

[0068] The second blocking part 223 has a second blocking member 2231, which is located at the rear of the second flow interruption part 222. When the water supply mechanism 1 drives water into the second installation pipe section 221 and the water pressure is lower than the thrust of the second elastic part 2032b, the second elastic part 2032b abuts the second blocking member 2231 against the rear of the second flow interruption part 222, so that the second water passage hole 2221 in the second flow interruption part 222 is covered, and the water cannot flow out through the second water passage hole 2221 and enter the toilet for drainage.

[0069] When the water pressure is higher than the thrust of the second elastic part 2032b, the second blocking member 2231 retracts, and water can flow out through the second water passage 2221, so that the water enters the downward flow channel 32 through the lower part of the toilet, and the lower end of the toilet can be flushed again.

[0070] [Example 2] This embodiment is basically the same as Example 1, except that the low-pressure conduction component 21 and the high-pressure conduction component 22 are solenoid valves. The water flow pressure is judged by the sensor, thereby controlling the opening or closing of the solenoid valve in the upward flow channel 31 and the downward flow channel 32.

[0071] like Figure 2 As shown, the water tank 4 is located between the water inlet section 33 and the diversion pre-channel 34, so that the water input from the water inlet section 33 can be stored in the water tank 4.

[0072] There is also a one-way channel 23 before the water inlet section 33 and the downstream flow channel 32; in the event of a water outage in the external environment, the water pressure in the water inlet section 33 is insufficient, and during the flushing process, some water can enter the water inlet section 33 from the one-way channel 23 and return to the water tank 4 through the water inlet section 33; by reducing the amount of water discharged at one time, water resources are saved, and the next flushing is realized (that is, in the event of a water outage, the amount of water in one flush is split into two flushes); in this embodiment, the one-way channel 23 is equipped with a one-way guide valve in the channel to guide excess liquid back into the water inlet section 33.

[0073] It should be noted that when the external water supply is sufficient, the water pressure in the inlet section 33 is adequate, and the water flow in the downstream channel 32 is not easy to pass through the one-way channel 23. Although some water will flow from the one-way channel 23 into the inlet section 33 during the flushing process, the aforementioned loss of water pressure does not affect the overall flushing effect.

[0074]

Example 3

[0075] This embodiment is basically the same as Embodiment 1, except that:

[0076] like Figure 4 As shown, it also includes a third flow interruption part 2123. The first flow interruption part 2122 and the third flow interruption part 2123 are located on both sides of the first blocking member 2131, respectively. The water supply mechanism 1 drives water into the low-pressure conduction component 21. When the water pressure is less than the set critical value, the first elastic part 2032a presses the first blocking member 2131 against the third flow interruption part 2123, so that water cannot pass through the first water passage 2121.

[0077] When the variable speed drive is not working, if the toilet tank is located at the top and above the outlet of the upward flow channel 31, the water in the tank will gradually drain out through the upward flow channel 31. This requires the first blocking member 2131 and the third flow-blocking part 2123 to work together to cut off the upward flow channel 31. In this embodiment, the critical value is the elastic force of the first elastic part 2032a when the first blocking member 2131 is pressed against the third flow-blocking part 2123. In reality, when the variable speed drive is not working, the water pressure is lower than the set critical value.

[0078] The toilet body usually has an additional solenoid valve to control the external water flow into the inlet section 33; if the inlet section 33 is directly connected to the external water flow and there is no solenoid valve, the water pressure in the pressure pipe is equal to the pressure of the external water flow, and the threshold value and the set value need to be adjusted accordingly.

[0079]

Example 4

[0080] This embodiment is basically the same as Embodiment 1, except that:

[0081] like Figure 5 As shown, the first blocking member 2131 and the second blocking member 2231 are connected by a linkage.

[0082] The second elastic portion 2032b above the second blocking member 2231 is discarded, the second blocking member 2231 is located below the second flow interruption portion 222, and the diversion mechanism 2 has a support rod 25 and a fixed end 26.

[0083] In practical use, the fixed end 26 and the middle of the support rod 25 are rotatably connected. The fixed end 26 is located at the junction of the second installation pipe section 221 and the first installation pipe section 211. The support rod 25 has a low-pressure support part 251 and a high-pressure support part 252. The two ends of the low-pressure support part 251 are respectively connected to the fixed end 26 and the first blocking member 2131, and the low-pressure support part 251 is at least partially located within the first installation pipe section 211. The two ends of the high-pressure support part 252 are respectively connected to the fixed end 26 and the second blocking member 2231, and the high-pressure support part 252 is at least partially located within the second installation pipe section 221. In practical use, due to the lever principle, when one end of the support rod 25 descends, the other end will rise.

[0084] When the flow velocity in the pre-diversion channel 34 is higher than the set value, the water pressure will push the first blocking member 2131 upward, and the second blocking member 2231 will be pushed downward due to the lever principle, so that there is a gap between the second blocking member 2231 and the second flow interruption part 222, and water can enter the toilet through the second water passage 2221.

[0085] This solution requires adjusting the area of ​​the first blocking member 2131 and the second blocking member 2231 in the low-pressure water circuit and the spring force. The area of ​​the first blocking member 2131 is larger than that of the second blocking member 2231, so that the first blocking member 2131 is subjected to greater pressure. Under low pressure, the pressure difference between the first blocking member 2131 and the second blocking member 2231 is balanced by the first elastic part 2032a, the upward flow channel 31 is open and the downward flow channel 32 is closed. When the pressure gradually rises to the set value, the first blocking member 2131 overcomes the elastic force of the first elastic part 2032a and opens the second blocking member 2231 through the lever structure, the upward flow channel 31 is closed and the downward flow channel 32 is open.

[0086] When the water supply mechanism 1 stops working, the first elastic part 2032a, due to elastic deformation, drives the first blocking member 2131 to move downward, and the second blocking member 2231, due to the lever principle, pushes upward, so that the second blocking member 2231 and the second flow interruption part 222 abut against each other, and water cannot pass through. This design allows the water in the upward flow channel 31 and the downward flow channel 32 to switch between each other.

[0087] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A waterway system, characterized in that, Including: A water supply mechanism (1) is used to drive the water flow; The diversion mechanism (2) is used to control the direction of water flow, one end of which is connected to the water supply mechanism (1); Piping mechanism (3), which is used to make the components of the water system interconnected; The pipeline structure (3) includes: Diversion front channel (34); The upward flow channel (31) is connected at one end to the diversion mechanism (2), and at the other end, water is supplied through the upper end of the toilet body (5); and The downstream flow channel (32) is connected at one end to the diversion mechanism (2) and at the other end to the lower end of the toilet body (5) to allow water to flow through. The water supply mechanism (1) includes at least a variable speed drive (11) and a water conveying component (12). A variable speed drive (11) is used to drive the water conveying component (12) to rotate, the water conveying component (12) being at least partially located within the diversion pre-channel (34); The diversion mechanism (2) includes: A low-pressure conductive assembly (21) is disposed within the first installation pipe section (211) of the upward flow channel (31); When the water pressure in the pre-diversion channel (34) is lower than the set value, the water flows from the low-pressure conduction component (21) to the upward flow channel (31); A high-pressure conducting assembly (22) is disposed within the second installation pipe section (221) of the downflow channel (32); When the water pressure in the pre-diversion channel (34) is higher than the set value, the water flows from the high-pressure conducting component (22) to the downflow channel (32); The diversion mechanism (2) also has a one-way channel (23), which is connected to the downflow channel (32) and the inlet section (33) of the water supply mechanism (1) at both ends, respectively. It is used to unidirectionally guide excess water from the downflow channel (32) into the inlet section (33). The low-voltage conduction component (21) includes: A first flow interruption section (2122) is located within a first installation pipe section (211). The first flow interruption section (2122) has a first water passage hole (2121), the diameter of which is smaller than the diameter of the first installation pipe section (211). The first blocking part (213) is movably disposed within the first installation pipe section (211) and located on one side adjacent to the diversion pre-channel (34); the first blocking part (213) has a first blocking member (2131), the movement trajectory of the first blocking member (2131) at least partially coincides with the first flow interruption part (2122), so that the first blocking member (2131) can cut off and open the first water passage (2121) by abutting against or disengaging from the first flow interruption part (2122); It also includes a third flow interruption section (2123), which closes the upstream flow channel (31) when the water flow pressure is below the critical value; The first blocking member (2131) is driven by the first elastic part (2032a) and moves downward toward the third flow interruption part (2123); The first blocking element (2131) and the second blocking element (2231) of the high-voltage conducting assembly (22) are connected by a linkage, and the shunt mechanism (2) has: The support rod (25) has a first blocking member (2131) and a second blocking member (2231) connected to its two ends respectively; The fixed end (26) is located at the junction of the second installation pipe section (221) and the first installation pipe section (211), and is rotatably connected to the support rod (25); The support rod (25) has: The low-pressure support part (251) is connected at both ends to the fixed end (26) and the first blocking member (2131), respectively; The high-pressure support (252) is connected at both ends to the fixed end (26) and the second blocking member (2231).

2. The water system according to claim 1, characterized in that, The high-voltage conduction assembly (22) includes: The second flow interruption part (222) is located inside the second installation pipe section (221). The second flow interruption part (222) has a second water passage hole (2221), the diameter of which is smaller than the diameter of the second installation pipe section (221). The second blocking part (223) is movably disposed within the second installation pipe section (221) and located on the side away from the diversion pre-channel (34); the second blocking part (223) has a second blocking member (2231), the movement trajectory of the second blocking member (2231) at least partially coincides with the second flow interruption part (222), so that the second blocking member (2231) cuts off and opens the second water passage (2221) by abutting against or disengaging from the second flow interruption part (222).

3. The water system according to claim 2, characterized in that, The low-pressure conduction component (21) further includes: a first elastic part (2032a) that causes the first blocking part (213) to maintain its tendency to move away from the first flow interruption part (2122); when the pressure in the diversion pre-channel (34) is higher than the set value, the water flow pressure causes the first blocking part (213) to abut against the first flow interruption part (2122); The high-pressure conducting component (22) further includes: a second elastic part (2032b) that causes the second blocking part (223) to maintain its movement tendency against the second flow interruption part (222); when the pressure in the diversion pre-channel (34) is higher than the set value, the water flow pressure causes the second blocking part (223) to disengage from the second flow interruption part (222).

4. A toilet, comprising a toilet body (5), characterized in that, It also includes the water system as described in any one of claims 1-3, The water tank (4) is connected at both ends to the inlet section (33) and the diversion pre-channel (34) respectively, and is used to pressurize the water flow into the water system.

Citation Information

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