Waterway switching mechanism and closestool

Abstract

The utility model provides a waterway switching mechanism and a closestool, the waterway switching mechanism comprises: a body having a water inlet channel, a first water outlet channel, a second water outlet channel, a first valve port communicated with the water inlet channel and the first water outlet channel, and a second valve port communicated with the water inlet channel and the second water outlet channel; the first back pressure valve is provided with a first water stop rubber mat and a first back pressure cavity, and the first water stop rubber mat closes the first valve port under the pressure action of the first back pressure cavity; the second backpressure valve is provided with a second water stop rubber mat and a second backpressure cavity, the second backpressure cavity is communicated with the first water outlet channel, and when water flows out of the first water outlet channel, the second valve port is closed by the second water stop rubber mat under the pressure action of the second backpressure cavity. The waterway switching mechanism is simple and compact in structure, low in cost and reliable in switching function.

Description

Technical Field

[0001] The utility model relates to a waterway switching mechanism and a toilet with the waterway switching mechanism. Background Art

[0002] Existing toilets generally are provided with a water tank, a waterway switching mechanism, an upper flushing waterway and a lower flushing waterway. The water in the water tank flows to the upper flushing waterway and the lower flushing waterway alternately through the waterway switching mechanism, so as to flush the inner wall surface of the toilet bowl through the upper flushing waterway and flush the bottom of the toilet bowl through the lower flushing waterway.

[0003] However, some of the waterway switching mechanisms in the prior art use solenoid valves for switching control, and the cost of solenoid valves is relatively high; some use two independently arranged back pressure valves for switching control, with a relatively complex structure, not compact, and occupying a large volume. Summary of the Utility Model

[0004] To solve the above technical problems, one of the purposes of the utility model is to provide a waterway switching mechanism which can realize reliable switching of the waterway, has a simple and compact structure and low cost.

[0005] Another purpose of the utility model is to provide a toilet with a waterway switching mechanism.

[0006] To achieve the above purposes, the technical solution adopted by the utility model is as follows:

[0007] A waterway switching mechanism includes:

[0008] A main body having a water inlet passage, a first water outlet passage, a second water outlet passage, a first valve port connecting the water inlet passage and the first water outlet passage, and a second valve port connecting the water inlet passage and the second water outlet passage;

[0009] A first back pressure valve having a first water stop rubber pad and a first back pressure chamber, the first water stop rubber pad being in opening and closing cooperation with the first valve port, and the first water stop rubber pad closing the first valve port under the pressure action of the first back pressure chamber;

[0010] A second back pressure valve having a second water stop rubber pad and a second back pressure chamber, the second water stop rubber pad being in opening and closing cooperation with the second valve port, the second back pressure chamber being connected to the first water outlet passage, and when the first water outlet passage discharges water, the second water stop rubber pad closing the second valve port under the pressure action of the second back pressure chamber.

[0011] In a preferred embodiment, the stress area of the first water stop rubber pad on one side of the first back pressure chamber is larger than the stress area of the first water stop rubber pad on the side facing away from the first back pressure chamber; the stress area of the second water stop rubber pad on one side of the second back pressure chamber is larger than the stress area of the second water stop rubber pad on the side facing away from the second back pressure chamber.

[0012] In a preferred embodiment, the moving direction of the first water stop rubber pad is perpendicular to the moving direction of the second water stop rubber pad.

[0013] In a preferred embodiment, the water inlet channel is connected to the outlet of a water pump for pumping water from a water tank.

[0014] In a preferred embodiment, a pressure relief hole is provided on the first back pressure chamber, and the water path switching mechanism further includes a driving member for opening and closing the pressure relief hole, and the driving member is an automatic driving member or a manual driving member.

[0015] In a preferred embodiment, the automatic driving member is a motor; or,

[0016] The automatic driving member is a buoyancy assembly, the buoyancy assembly is arranged in a water tank, and the buoyancy assembly includes a floating cylinder that rises and falls with the water level in the water tank.

[0017] In a preferred embodiment, the buoyancy assembly further includes a screw rod and a lifting rod, the lifting rod is rotatably arranged on the body, the screw rod is in threaded cooperation with the floating cylinder, the top end of the screw rod is movably connected to the first end of the lifting rod, and a back pressure pad for cooperating with the pressure relief hole is provided at the second end of the lifting rod.

[0018] In a preferred embodiment, an outer pipe and an inner pipe sleeved in the outer pipe at intervals are formed on the first water outlet channel, a bent U-shaped water path is formed between the outer pipe and the inner pipe, and the U-shaped water path forms the second back pressure chamber; the second water stop rubber pad includes a sealing portion, a deformation portion and a guiding portion, the sealing portion cooperates with the second valve port, the deformation portion is clamped between the end of the outer pipe and a gland, and the guiding portion extends into the gap between the outer pipe and the inner pipe and is in guiding cooperation with the inner wall of the outer pipe.

[0019] In addition, the present invention further provides a toilet, which includes an upper flushing water path and a lower flushing water path, and further includes the water path switching mechanism according to any one of the above, the first water outlet channel is communicated with the lower flushing water path, and the second water outlet channel is communicated with the upper flushing water path.

[0020] In a preferred embodiment, a water tank is further included, the water path switching mechanism is installed in the water tank, a water pump is arranged in the water tank, and the water pump is communicated with the water inlet channel.

[0021] Compared with the prior art, the utility model has at least the following beneficial effects:

[0022] The utility model can controllably switch to connect the water inlet channel with the first water outlet channel or the second water outlet channel by setting mechanical first back-pressure valve and second back-pressure valve, so that it is not necessary to use a solenoid valve for control switching, and the cost is lower.

[0023] The utility model arranges the second back-pressure cavity of the second back-pressure valve at the rear end of the first back-pressure valve and in parallel with the second water outlet channel. That is, the second back-pressure cavity is connected with the first water outlet channel and not connected with the second water outlet channel. Therefore, the second back-pressure cavity of the second back-pressure valve controls the back-pressure through the first water outlet channel, and the back-pressure of the second back-pressure cavity increases and decreases with the increase and decrease of the water pressure in the first water outlet channel. Specifically, when the first water outlet channel does not discharge water, the back-pressure of the second back-pressure cavity drops, so that the second water-stop rubber pad opens the second valve port. That is, when the first back-pressure valve is closed, the second back-pressure valve is opened; when the first water outlet channel discharges water, the back-pressure of the second back-pressure cavity rises, so that the second water-stop rubber pad closes the second valve port. That is, when the first back-pressure valve is opened, the second back-pressure valve is closed. With such a design, the back-pressure of the second back-pressure valve can be controlled through the first back-pressure valve, so that it is not necessary to additionally arrange components (such as a motor, a buoyancy assembly or a manual switch, etc.) for controlling the back-pressure of the second back-pressure valve. Compared with the prior art, the structure in which the two back-pressure valves are independently controlled respectively is simpler, and the volume occupied inside the water tank is small. Moreover, when the first back-pressure valve of the utility model is opened, it can ensure that the second back-pressure valve will be closed simultaneously, and the switching function is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the utility model, and constitute a part of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model, and do not constitute an improper limitation to the utility model.

[0025] Wherein:

[0026] Figure 1 is a three-dimensional schematic view of the water path switching mechanism and the water pump assembled together in an embodiment of the utility model;

[0027] Figure 2 is a three-dimensional exploded view of the water path switching mechanism and the water pump in an embodiment of the utility model;

[0028] Figure 3 is one of the sectional views of the water path switching mechanism and the water pump assembled together in an embodiment of the utility model (at this time, the second back-pressure valve is in a closed state);

[0029] Figure 4 is Figure 3 the sectional view at A-A of;

[0030] Figure 5 It is the second cross-sectional view of the waterway switching mechanism and the water pump assembled together in an embodiment of the present utility model (at this time, the first backpressure valve is in the closed state);

[0031] Figure 6 It is Figure 5 the cross-sectional view at B-B of

[0032] Figure 7 It is the schematic diagram of the water flow of the waterway switching mechanism of the present utility model in the state where the first backpressure valve is closed and the second backpressure valve is opened;

[0033] Figure 8 It is Figure 7 the cross-sectional view at A-A of Figure 7 in the

[0034] Figure 9 It is the schematic diagram of the water flow of the waterway switching mechanism of the present utility model in the state where the first backpressure valve is opened and the second backpressure valve is closed;

[0035] Figure 10 It is Figure 9 the cross-sectional view at B-B of Figure 9 in the

[0036] In the figure, the reference numerals are:

[0037] 10 - body; 11 - water inlet channel; 12 - first water outlet channel; 121 - outer tube; 122 - inner tube; 123 - U-shaped waterway; 13 - second water outlet channel; 14 - first valve port; 15 - second valve port; 16 - gland;

[0038] 20 - first backpressure valve; 21 - first water stop rubber pad; 22 - first backpressure chamber; 221 - pressure relief hole;

[0039] 30 - second backpressure valve; 31 - second water stop rubber pad; 311 - sealing part; 312 - deforming part; 313 - guiding part; 32 - second backpressure chamber;

[0040] 40 - water pump. Detailed implementation manners

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0042] In the following discussion, details are given to provide a more thorough understanding of the present utility model. However, those skilled in the art can understand that the present utility model can be implemented without one or more of these details. In specific examples, in order to avoid confusion with the present utility model, some well-known technical features in the art are not described in detail. It should be noted that the terms "upper", "lower", "front", "rear", "left", "right" and similar expressions used herein are for illustrative purposes only and are not restrictive.

[0043] The ordinal numbers such as "first" and "second" cited in the present utility model are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component".

[0044] Please refer to Figures 1 to 10 , a waterway switching mechanism according to a preferred embodiment provided by the present utility model includes a body 10, a first backpressure valve 20, and a second backpressure valve 30. Among them, both the first backpressure valve 20 and the second backpressure valve 30 are backpressure control valves, and the working principle of the backpressure control valve is known in the art, that is, both use a pressure difference to achieve opening and closing control.

[0045] The body 10 has a water inlet passage 11, a first water outlet passage 12, a second water outlet passage 13, a first valve port 14 connecting the water inlet passage 11 and the first water outlet passage 12, and a second valve port 15 connecting the water inlet passage 11 and the second water outlet passage 13.

[0046] The first backpressure valve 20 has a first water stop rubber pad 21 and a first backpressure chamber 22. The first water stop rubber pad 21 is opened and closed in cooperation with the first valve port 14. The first water stop rubber pad 21 closes the first valve port 14 under the pressure of the first backpressure chamber 22, and opens the first valve port 14 under the water pressure of the water inlet passage 11 when the first backpressure chamber 22 is depressurized.

[0047] The second backpressure valve 30 has a second water stop rubber pad 31 and a second backpressure chamber 32. The second water stop rubber pad 31 is opened and closed in cooperation with the second valve port 15. The second backpressure chamber 32 is connected to the first water outlet passage 12. When water flows out of the first water outlet passage 12, the second water stop rubber pad 31 closes the second valve port 15 under the pressure of the second backpressure chamber 32. It can be understood that since the second backpressure chamber 32 is connected to the first water outlet passage 12, the pressure in the second backpressure chamber 32 is the water flow pressure in the first water outlet passage 12. The second water stop rubber pad 31 will open the second valve port 15 under the water pressure of the water inlet passage 11 when the second backpressure chamber 32 is depressurized (that is, when there is no water flow and no water pressure in the first water outlet passage 12).

[0048] The main improvement of the present utility model is that the second back pressure chamber 32 of the second back pressure valve 30 is arranged at the rear end of the first back pressure valve 20 and is in parallel with the second water outlet channel 13. That is, the second back pressure chamber 32 is communicated with the first water outlet channel 12 and not communicated with the second water outlet channel 13. Therefore, the back pressure of the second back pressure chamber 32 of the second back pressure valve 30 is controlled through the first water outlet channel 12, and the back pressure of the second back pressure chamber 32 increases and decreases with the increase and decrease of the water pressure in the first water outlet channel 12. Specifically, when the first water outlet channel 12 does not discharge water (i.e., when the first back pressure valve 20 is closed), the back pressure of the second back pressure chamber 32 drops, so that the second water stop rubber pad 31 opens the second valve port 15 (i.e., the second back pressure valve 30 opens); when the first water outlet channel 12 discharges water (i.e., when the first back pressure valve 20 is open), the back pressure of the second back pressure chamber 32 rises, so that the second water stop rubber pad 31 closes the second valve port 15 (i.e., the second back pressure valve 30 closes). With such a design, the back pressure of the second back pressure valve 30 can be controlled through the first back pressure valve 20, so that there is no need to additionally provide components (such as a motor, a buoyancy component or a manual switch, etc.) for controlling the back pressure of the second back pressure valve 30. Compared with the prior art, the structure in which the two back pressure valves are independently controlled respectively is simpler and occupies less volume inside the water tank. Moreover, when the first back pressure valve 20 of the present utility model is open, it can ensure that the second back pressure valve 30 will be closed simultaneously, and the switching function is reliable.

[0049] Specifically, in this embodiment, a pressure relief hole 221 is provided on the first back pressure chamber 22, and the water path switching mechanism further includes a driving member for opening and closing the pressure relief hole 221. The driving member can be an automatic driving member or a manual driving member. When an automatic driving member is adopted, the automatic driving member can adopt a motor to control the opening and closing of the pressure relief hole 221; or the automatic driving member can also adopt a buoyancy component, and the buoyancy component is arranged in a water tank. The buoyancy component includes a floating cylinder that rises and falls with the water level in the water tank. Of course, the driving member can also adopt other driving forms as long as it can open and close the pressure relief hole 221.

[0050] Preferably, the driving member in this embodiment adopts a buoyancy component. The buoyancy component closes the pressure relief hole 221 to prevent the water in the first back pressure chamber 22 from draining away, so that the first back pressure chamber 22 has a back pressure, and thus the first water stop rubber pad 21 can close the first valve port 14. The buoyancy component opens the pressure relief hole 221 to allow the water in the first back pressure chamber 22 to drain away, so that the first back pressure chamber 22 no longer provides back pressure to the first water stop rubber pad 21, and thus the first water stop rubber pad 21 can open the first valve port 14.

[0051] In this embodiment, the force-bearing area of the first water-stop rubber pad 21 on one side of the first back-pressure chamber 22 is larger than the force-bearing area of the first water-stop rubber pad 21 on the side facing away from the first back-pressure chamber 22. In this way, when the water pressure of the incoming water flow in the water inlet passage 11 is the same, when there is water pressure in the first back-pressure chamber 22, the water pressure F1 received by the first water-stop rubber pad 21 on the side of the first back-pressure chamber 22 will be greater than the water pressure F2 received by the first water-stop rubber pad 21 on the side facing away from the first back-pressure chamber 22. Thus, under the action of the pressure difference between F1 and F2, the first water-stop rubber pad 21 moves in the direction of closing the first valve port 14 until the first valve port 14 is closed.

[0052] In this embodiment, the force-bearing area of the second water-stop rubber pad 31 on one side of the second back-pressure chamber 32 is larger than the force-bearing area of the second water-stop rubber pad 31 on the side facing away from the second back-pressure chamber 32. In this way, when the water pressure of the incoming water flow in the water inlet passage 11 is the same, when there is water pressure in the second back-pressure chamber 32, the water pressure F3 received by the second water-stop rubber pad 31 on the side of the second back-pressure chamber 32 will be greater than the water pressure F4 received by the second water-stop rubber pad 31 on the side facing away from the second back-pressure chamber 32. Thus, under the action of the pressure difference between F3 and F4, the second water-stop rubber pad 31 moves in the direction of closing the second valve port 15 until the second valve port 15 is closed.

[0053] In order to make the structure inside the body 10 more compact, in this embodiment, an outer tube 121 is formed on the first water outlet passage 12, and an inner tube 122 is sleeved inside the outer tube 121 at intervals. A bent U-shaped water passage 123 is formed between the outer tube 121 and the inner tube 122, and the U-shaped water passage 123 forms the second back-pressure chamber 32.

[0054] In order to reliably control the movement of the second water-stop rubber pad 31, in this embodiment, the second water-stop rubber pad 31 is designed to include a sealing portion 311, a deformation portion 312, and a guiding portion 313. The sealing portion 311 cooperates with the second valve port 15. The deformation portion 312 is clamped between the end of the outer tube 121 and a gland 16. The guiding portion 313 extends into the gap between the outer tube 121 and the inner tube 122 and is in guiding cooperation with the inner wall of the outer tube 121. By providing the guiding portion 313, it can be ensured that the second water-stop rubber pad 31 reliably moves between opening the second valve port 15 and closing the second valve port 15.

[0055] In this embodiment, the movement direction of the first water-stop rubber pad 21 is perpendicular to the movement direction of the second water-stop rubber pad 31. With this setting, the structure of the body 10 is more compact and the layout is more reasonable.

[0056] In this embodiment, the water inlet passage 11 is connected to the outlet of a water pump 40 for pumping water from a water tank. That is, the water pump 40 pumps the water in the water tank to the water inlet passage 11 to provide a water flow with a certain water pressure to the body 10.

[0057] In this embodiment, the buoyancy assembly can adopt an existing known structure, and its schematic diagram is omitted here. In addition to the buoyancy cylinders described above, the existing known buoyancy assembly usually further includes a screw rod and a lifting rod. The lifting rod is rotatably arranged on the main body 10. The screw rod is in threaded fit with the buoyancy cylinder. The top end of the screw rod is movably connected to the first end of the lifting rod. A back pressure pad cooperating with the pressure relief hole 221 is provided at the second end of the lifting rod. The back pressure pad is made of soft rubber and can seal the pressure relief hole 221 when the pressure relief hole 221 is closed.

[0058] In addition, the present utility model further provides a toilet (not shown), including a water tank (not shown), an upper flushing waterway (not shown), a lower flushing waterway (not shown), and the waterway switching mechanism according to any one of the above. The waterway switching mechanism is installed in the water tank. A water pump 40 is provided in the water tank. The water pump 40 is communicated with the water inlet passage 11. The first water outlet passage 12 is communicated with the lower flushing waterway. The second water outlet passage 13 is communicated with the upper flushing waterway. The lower flushing waterway is used for spraying water at the bottom of the toilet bowl. The upper flushing waterway is used for flushing the inner peripheral wall of the toilet bowl.

[0059] The flushing process of the toilet in this embodiment is generally as follows:

[0060] (1) The upper flushing process of the toilet: Refer to Figure 7 and Figure 8 . At this time, the water tank is in a full water state. The water pump 40 is turned on, and the water pump 40 pumps the water in the water tank to the water inlet passage 11. At this time, for the first back pressure valve 20, since the buoyancy assembly is in a floating state and seals the pressure relief hole 221, the water in the first back pressure chamber 22 cannot leak out through the pressure relief hole 221. Therefore, there is water pressure (i.e., back pressure) in the first back pressure chamber 22. The water pressure F1 received by the first water stop rubber pad 21 on one side of the first back pressure chamber 22 is greater than the water pressure F2 received by the first water stop rubber pad 21 on the side facing away from the first back pressure chamber 22. Further, under the action of the pressure difference between F1 and F2, the first water stop rubber pad 21 is in a state of closing the first valve port 14, and the first water outlet passage 12 does not discharge water. At the same time, for the second back pressure valve 30, since there is no water pressure because the first water outlet passage 12 does not discharge water, that is, there is no back pressure in the second back pressure chamber 32. The second water stop rubber pad 31 is opened by the water pressure of the water inlet passage 11 to open the second valve port 15, thereby connecting the water inlet passage 11 and the second water outlet passage 13. The water flow in the water inlet passage 11 passes through the second water outlet passage 13 to the upper flushing waterway to flush the inner peripheral wall of the toilet bowl, thus realizing the upper flushing process of the toilet. Figure 7 and Figure 8 The arrows in

[0061] (2) Downward flushing process of the toilet: The water pump 40 continuously pumps water. As the water level in the water tank drops, when the water level drops to the point where the buoyancy assembly also drops, the buoyancy assembly then opens the pressure relief hole 221, allowing the water in the first back pressure chamber 22 to drain through the pressure relief hole 221. Without back pressure in the first back pressure chamber 22, the first water stop rubber pad 21 is opened by the water pressure in the water inlet channel 11 to open the first valve port 14, thus connecting the water inlet channel 11 and the first water outlet channel 12. The water flow in the water inlet channel 11 passes through the first water outlet channel 12 to the downward flushing water path to spray water on the bottom of the toilet bowl, thereby realizing the downward flushing process of the toilet. At this time, refer to Figure 9 and Figure 10 as shown, Figure 9 and Figure 10 The arrows in indicate the water flow direction. At the same time, for the second back pressure valve 30, since water flows out of the first water outlet channel 12, that is, back pressure is generated in the second back pressure chamber 32. The water pressure F3 received by the second water stop rubber pad 31 on one side of the second back pressure chamber 32 will be greater than the water pressure F4 received by the second water stop rubber pad 31 on the side away from the second back pressure chamber 32. Thus, under the pressure difference between F3 and F4, the second water stop rubber pad 31 closes the second valve port 15, and no water flows out of the second water outlet channel 13, that is, the second back pressure valve 30 is in the closed state.

[0062] In the above process, Figure 7 and Figure 8 the water path switching mechanism is that the first back pressure valve 20 is closed and the second back pressure valve 30 is open. As the buoyancy assembly drops, the water path switching mechanism switches the first back pressure valve 20 to open and the second back pressure valve 30 to close, thereby realizing the switching of the water path and further realizing the switching between the upward flushing and downward flushing of the toilet.

[0063] After the flushing is completed, the water pump 40 is turned off, and the water tank is refilled through the water inlet valve (not shown) of the water tank, so that the water level in the water tank returns to the full water level state, the buoyancy assembly returns to the floating state, and the water path switching mechanism also returns to Figure 7 and Figure 8 the state of to prepare for the next flushing.

[0064] Unless otherwise defined, the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the technical field of the present utility model. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. Terms such as "component" as used herein can represent either a single part or a combination of multiple parts. Terms such as "mounted" and "arranged" as used herein can represent either a component being directly attached to another component or a component being attached to another component through an intermediate member. Features described in one embodiment herein can be applied alone or in combination with other features to another embodiment, unless the feature is not applicable or otherwise stated in that other embodiment.

[0065] The above description shows and describes the preferred embodiments of the present utility model. As mentioned above, it should be understood that the present utility model is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept of the present utility model herein through the above teachings or the techniques or knowledge in related fields. Any changes and modifications made by those skilled in the art that do not depart from the spirit and scope of the present utility model shall fall within the protection scope of the appended claims of the present utility model.

Claims

1. A waterway switching mechanism, characterized in that: include: A body having a water inlet channel, a first water outlet channel, a second water outlet channel, a first valve port connecting the water inlet channel and the first water outlet channel, and a second valve port connecting the water inlet channel and the second water outlet channel; A first back-pressure valve, comprising a first water-stop rubber pad and a first back-pressure cavity, wherein the first water-stop rubber pad cooperates with the first valve port for opening and closing, and the first water-stop rubber pad closes the first valve port under the pressure of the first back-pressure cavity; The second back-pressure valve comprises a second water-stop rubber pad and a second back-pressure chamber. The second water-stop rubber pad cooperates with the opening and closing of the second valve port. The second back-pressure chamber is connected with the first water outlet channel. When water flows out of the first water outlet channel, the second water-stop rubber pad closes the second valve port under the pressure of the second back-pressure chamber.

2. The waterway switching mechanism according to claim 1, characterized in that: The force-bearing area of ​​the first water-stop rubber pad on the side of the first back-pressure cavity is larger than the force-bearing area of ​​the first water-stop rubber pad on the side facing away from the first back-pressure cavity; the force-bearing area of ​​the second water-stop rubber pad on the side of the second back-pressure cavity is larger than the force-bearing area of ​​the second water-stop rubber pad on the side facing away from the second back-pressure cavity.

3. The waterway switching mechanism according to claim 1, characterized in that: The moving direction of the first water-stopping rubber pad is perpendicular to the moving direction of the second water-stopping rubber pad.

4. The waterway switching mechanism according to claim 1, characterized in that: The water inlet channel is connected to the outlet of a water pump for extracting water from the water tank.

5. The waterway switching mechanism according to claim 1, characterized in that: The first back pressure chamber is provided with a pressure relief hole, and the water channel switching mechanism further comprises a driving member for opening and closing the pressure relief hole, and the driving member is an automatic driving member or a manual driving member.

6. The waterway switching mechanism according to claim 5, characterized in that: The automatic drive member adopts a motor; or, The automatic driving member adopts a buoyancy component, which is arranged in a water tank and includes a float that rises and falls with the water level of the water tank.

7. The waterway switching mechanism according to claim 6, characterized in that: The buoyancy assembly also includes a screw and a lifting rod. The lifting rod is rotatably arranged on the main body. The screw is threadedly engaged with the buoy. The top end of the screw is movably connected to the first end of the lifting rod. The second end of the lifting rod is provided with a back pressure pad that cooperates with the pressure relief hole.

8. The waterway switching mechanism according to claim 1, characterized in that: The first water outlet channel is formed with an outer tube and an inner tube which is spaced apart inside the outer tube, a bent U-shaped waterway is formed between the outer tube and the inner tube, and the U-shaped waterway forms the second back pressure chamber; the second water-stop rubber pad includes a sealing portion, a deformation portion and a guide portion, the sealing portion cooperates with the second valve port, the deformation portion is clamped between the end of the outer tube and a pressure cover, and the guide portion extends into the gap between the outer tube and the inner tube and cooperates with the inner wall guide of the outer tube.

9. A toilet, comprising an upper flushing waterway and a lower flushing waterway, characterized in that: It also includes the water channel switching mechanism according to any one of claims 1 to 8, wherein the first water outlet channel is connected to the lower flushing water channel, and the second water outlet channel is connected to the upper flushing water channel.

10. The toilet according to claim 9, characterized in that: It also includes a water tank, the water channel switching mechanism is installed in the water tank, a water pump is arranged in the water tank, and the water pump is connected with the water inlet channel.

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