A waterway switching drain device for a toilet and a toilet

Abstract

The utility model provides a kind of waterway switching's drain device and closestool for closestool, including water tank, water inlet part, drainage part and drive part, using water inlet valve, upper flush drain valve and lower flush drain valve are back pressure cavity type control structure, the opening and closure of corresponding valve body are controlled by pneumatic or the lifting of float, to good realization waterway switching;Upper flush drain valve opens, and water in water inlet pipe is used as driving force, cooperate with the venturi pipe section that extends into water tank, water in water tank is pumped out, realizes upper flush water outlet;And the opening of lower flush drain valve is directly used in water inlet pipe water and is sprayed to wash, in this way, the water consumption in water tank is reduced, so that the volume of water tank can be reduced;No electric component contacts water in whole process, to avoid the occurrence of electrical safety hazard.

Description

Technical Field

[0001] This utility model relates to the field of toilets, specifically to a drainage device for switching water flow in a toilet and a toilet. Background Technology

[0002] Toilets are a common bathroom fixture. Through years of development and improvement, they have acquired many user-friendly functions, greatly facilitating the needs of daily life. Existing technologies include water circuit switching structures, such as using a water pump to draw water from the tank and an electric switching valve to switch the water flow. However, these water circuit switching structures have the following drawbacks: 1. All flushing water comes from the tank, resulting in a large tank volume; 2. Electric components (such as the water pump and electric switching valve) are in direct contact with water. Although waterproof designs can be implemented, prolonged contact and use can easily create electrical safety hazards. Utility Model Content

[0003] Therefore, this utility model provides a drainage device and toilet for switching water paths, which achieves water path switching without using electric components that directly contact the water, and can effectively reduce the volume of the water tank.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows: A toilet water circuit switching drainage device includes a water tank, a water inlet section, a drainage section, and a drive section. The water tank contains a first water storage tank and a second water storage tank. A switching float is installed in the first water storage tank, and a water inlet float is installed in the second water storage tank. The switching float descends to the switching position before the water inlet float and rises to a higher position before the water inlet float. The water inlet section includes a water inlet pipe and a water inlet valve connected to the water inlet pipe. The drainage section includes an upper flush drain valve and a lower flush drain valve connected to the water inlet pipe. All three valves—the water inlet valve, the upper flush drain valve, and the lower flush drain valve—are back pressure chamber type control structures. The pressure relief hole of the back pressure chamber of the upward flushing drain valve is normally closed by a pneumatic plug; the outlet of the upward flushing drain valve is connected to an upward flushing drain pipe, which extends into the water tank and is equipped with a Venturi tube section; the drive part includes a three-way air pipe and a vent valve, the air inlet of the three-way air pipe is used to connect to an external air supply device, its first outlet is connected to the pneumatic plug of the upward flushing drain valve, and its second outlet is connected to the vent valve; the switching float synchronously controls the opening and closing of the vent hole of the vent valve and the pressure relief hole of the back pressure chamber of the downward flushing drain valve; the water inlet float controls the opening and closing of the pressure relief hole of the back pressure chamber of the water inlet valve.

[0005] Furthermore, the first and second water storage tanks are arranged horizontally side by side and both are provided with drainage holes for drainage. The water level in the first water storage tank drops at a faster rate than that in the second water storage tank, so that the switching float in the first water storage tank descends to the switching position before the inlet float in the second water storage tank.

[0006] Furthermore, the outlet end of the inlet valve is connected to the first water storage tank via a water supply pipe, so that the switching float in the first water storage tank rises to a higher position before the inlet float in the second water storage tank.

[0007] Furthermore, it also includes a switching lever, the first end of which is connected to the switching float, and the second end of which corresponds to the vent hole of the vent valve and the pressure relief hole of the back pressure chamber of the downdraft drain valve; when the switching float is in a high position, the vent hole of the vent valve and the pressure relief hole of the back pressure chamber of the downdraft drain valve are blocked by the switching lever; when the switching float descends to the switching position, the vent hole of the vent valve and the pressure relief hole of the back pressure chamber of the downdraft drain valve are opened.

[0008] Furthermore, the vent valve is installed on the down-draft drain valve, and the pressure relief hole of the back pressure chamber of the down-draft drain valve is arranged adjacent to the vent hole of the vent valve.

[0009] Furthermore, it also includes an inlet lever, the first end of which is connected to the inlet float, and the second end of which corresponds to the pressure relief hole of the back pressure chamber of the inlet valve. When the inlet float is in a high position, the pressure relief hole of the back pressure chamber of the inlet valve is blocked by the switching lever. When the inlet float descends to the switching position, the pressure relief hole of the back pressure chamber of the inlet valve is opened.

[0010] Furthermore, the flushing drain pipe has a water inlet at the outlet end connected to the inlet valve on the rear pipe of the Venturi pipe section. The flushing drain pipe has a switching plate hinged to the front end of the water inlet. The switching plate can swing and switch between blocking the water inlet and blocking the flushing drain pipe opening at the front end of the water inlet.

[0011] Furthermore, the three-way air pipe includes a first air pipe, a three-way pipe, and a second air pipe. The first air pipe is connected to the air supply device and the first interface of the three-way pipe, and the second interface of the three-way pipe is connected to a pneumatic plug. The second air pipe is connected to the third interface of the three-way pipe and a vent valve, and a one-way valve is provided on the first air pipe.

[0012] Furthermore, the pneumatic plug includes an air bladder, a plug shell, and an elastic element. The plug shell has a connecting post with a pressure relief hole smaller than the back pressure chamber of the upward flushing drain valve. The connecting post passes through the pressure relief hole of the back pressure chamber of the upward flushing drain valve. The end of the connecting post forms a plug head with a diameter larger than the pressure relief hole of the back pressure chamber of the upward flushing drain valve. The elastic element applies elastic force to the plug shell so that the plug head blocks the pressure relief hole of the back pressure chamber of the upward flushing drain valve. The air bladder is connected to the first outlet of the three-way air tube. The inflation of the air bladder drives the plug shell to move against the elastic force of the elastic element, thereby causing the plug head to disengage from the pressure relief hole of the back pressure chamber of the upward flushing drain valve.

[0013] A toilet includes at least the aforementioned water path switching drainage device for toilets, wherein the upper flush drain pipe is connected to the upper flush brush ring water channel of the toilet, and the outlet end of the lower flush drain valve is connected to the lower spray channel of the toilet.

[0014] The technical solution provided by this utility model has the following beneficial effects: The inlet valve, top flush valve, and bottom flush valve all feature a back pressure chamber control structure. The opening and closing of the corresponding valves are controlled by pneumatic or float-mounted mechanisms, effectively switching water paths. When the top flush valve opens, water from the inlet pipe acts as the driving force, working in conjunction with a Venturi tube extending into the tank to draw water out, achieving top flushing. The bottom flush valve opens by directly using water from the inlet pipe for downward spraying, thus reducing the amount of water used in the tank and allowing for a smaller tank volume. No electric components come into contact with the water throughout the process, preventing potential electrical safety hazards. Attached Figure Description

[0015] Figure 1 The diagram shown is a structural schematic of the drainage device for water path switching in the toilet, as illustrated in this embodiment. Figure 1 ; Figure 2 The diagram shown is a structural schematic of the drainage device for water path switching in the toilet, as illustrated in this embodiment. Figure 2 ; Figure 3 The diagram shown is a cross-sectional view of the drainage device for water circuit switching in the toilet, as described in the embodiment. Figure 1 ; Figure 4 The diagram shown is a cross-sectional view of the drainage device for water circuit switching in the toilet, as described in the embodiment. Figure 2 ; Figure 5 The diagram shown is a cross-sectional view of the drainage device for water circuit switching in the toilet, as described in the embodiment. Figure 3 ; Figure 6 As shown Figure 2 An enlarged schematic diagram of region A in the middle. Detailed Implementation

[0016] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0017] In the description of this utility model, terms such as "upper", "lower", "left", "right", "front", and "rear" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0019] Reference Figures 1 to 6 As shown in the figure, this embodiment provides a toilet water circuit switching drainage device, including a water tank 1, a water inlet section, a drainage section, and a drive section. The water tank 1 has a first water storage tank 2 and a second water storage tank 3. A switching float 4 is provided in the first water storage tank 2, and a water inlet float 5 is provided in the second water storage tank 3. The switching float 4 descends to the switching position before the water inlet float 5, and also rises to a high position before the water inlet float 5. That is, when the water tank 1 drains, the switching float 4 descends to the switching position before the water inlet float 5, and when the water tank 1 is replenished, the switching float 4 also rises to a high position before the water inlet float 5. In other words, the switching action of the switching float 4 is faster than that of the water inlet float 5.

[0020] The water inlet section includes a water inlet pipe 6 and a water inlet valve 30 connected to the water inlet pipe 6. The drainage section includes an upper flush drain valve 10 and a lower flush drain valve 20 connected to the water inlet pipe 6. The water inlet pipe 6 is used to connect to an external water source (such as a tap water pipe). The water inlet valve 30, the upper flush drain valve 10 and the lower flush drain valve 20 are all connected to the water inlet pipe 6 and are used to introduce water into the water inlet pipe 6.

[0021] The inlet valve 30, the upper flush drain valve 10, and the lower flush drain valve 20 are all back pressure chamber control structures. That is, the pressure in the back pressure chamber drives the water-stop component to seal the water passage in the valve body, thus achieving the purpose of closing. When the pressure in the back pressure chamber is released, the water at the inlet end can flush open the water-stop component, thereby achieving the purpose of opening. The back pressure chamber control structure is existing technology and will not be described in detail here.

[0022] The pressure relief hole of the back pressure chamber of the top-flush drain valve 10 is normally closed by a pneumatic plug 11; that is, without external force, the pressure relief hole of the back pressure chamber of the top-flush drain valve 10 is closed, and the back pressure chamber of the top-flush drain valve 10 maintains a pressure state. The outlet of the top-flush drain valve 10 is connected to a top-flush drain pipe 12, which is used to connect to the top-flush brush water channel of the toilet to provide brush water for the toilet; the top-flush drain pipe 12 extends into the water tank 1 and is provided with a Venturi section 123; as in this embodiment, the top-flush drain pipe 12 has a U-shaped structure, and the Venturi section 123 is located at the bottom end. The Venturi section 123 specifically includes a small nozzle 124 formed on the front end pipe section 121 and a nozzle located at the rear end. The flared mouth 125 on the end pipe section 122 has a small nozzle 124 corresponding to it, and the diameter of the small nozzle 124 is smaller than that of the flared mouth 125. There is a gap between the small nozzle 124 and the flared mouth 125. When the small nozzle 124 sprays water into the flared mouth 125, it generates negative pressure. Under the action of this negative pressure, the water in the water tank 1 is drawn into the upper flush drain pipe 12 and discharged. That is, the water output through the upper flush drain valve 10 is used as the driving force to drive the water in the water tank 1 to discharge.

[0023] The drive unit includes a three-way air pipe 40 and a vent valve 60. The air inlet of the three-way air pipe 40 is used to connect to an external air supply device, which can be a vacuum pump. The vacuum pump can be installed outside the water tank 1 and will not come into direct contact with the water. The first outlet of the three-way air pipe 40 is connected to the pneumatic plug 11 of the flush drain valve 10, and the second outlet of the three-way air pipe 40 is connected to the vent valve 60.

[0024] The switching float 4 synchronously controls the opening and closing of the vent hole 61 of the vent valve 60 and the pressure relief hole 22 of the back pressure chamber of the downdraft drain valve 20; specifically, when the switching float 4 descends to the switching position, it controls the simultaneous opening of the vent hole 61 of the vent valve 60 and the pressure relief hole 22 of the back pressure chamber of the downdraft drain valve 20; when the switching float 4 rises to a high position, it controls the simultaneous closing of the vent hole 61 of the vent valve 60 and the pressure relief hole 22 of the back pressure chamber of the downdraft drain valve 20.

[0025] The inlet float 5 controls the opening and closing of the pressure relief hole of the back pressure chamber of the inlet valve 30. Specifically, when the inlet float 5 descends to the switching position, it controls the opening of the pressure relief hole of the back pressure chamber of the inlet valve 30. When the inlet float 5 rises to a high position, it controls the closing of the pressure relief hole of the back pressure chamber of the inlet valve 30.

[0026] Furthermore, this embodiment also provides a toilet, which includes at least the above-described drain device for switching water flow in the toilet, wherein the upper flush drain pipe is connected to the upper flush brush ring water channel of the toilet, and the outlet 21 of the lower flush drain valve 20 is connected to the lower spray channel of the toilet.

[0027] The working principle of the water circuit switching drainage device used in this toilet is as follows: In the initial state, the water in the water tank 1 is at a high level, the switching float 4 and the water inlet float 5 are also at a high level, and the water inlet valve 30, the upper flush drain valve 10 and the lower flush drain valve 20 are in the closed state. When the external gas supply equipment outputs gas to the three-way air pipe 40, one path of gas is output from the first outlet of the three-way air pipe 40 to the pneumatic plug 11, and the other path is output from the second outlet to the vent valve 60. Since the switching float 4 is in a high position, the vent hole 61 of the vent valve 60 is closed, and the gas cannot flow out from the vent hole 61 of the vent valve 60. Therefore, the gas can only be continuously output to the pneumatic plug 11, which in turn pushes the pneumatic plug 11 to continuously open the pressure relief hole of the back pressure chamber of the upper flushing water inlet valve 10. The pressure in the back pressure chamber of the upper flushing water inlet valve 10 is released, and the water in the inlet pipe 6 pushes the water stop component of the upper flushing water inlet valve 10 to make way. The upper flushing water inlet valve 10 is opened, and the water in the inlet pipe 6 flows into the upper flushing drain pipe 12. When passing through the Venturi section 123, a negative pressure is generated, thereby drawing out the water in the water tank 1. As the water level in tank 1 drops, the water in the first water tank 2 and the second water tank 3 is also discharged. During this process, the switching float 4 descends to the switching position before the inlet float 5. When the switching float 4 descends to the switching position, the vent 61 of the vent valve 60 and the pressure relief hole 22 of the back pressure chamber of the downflush valve 20 are opened simultaneously. The gas in the pneumatic plug 11 and the three-way air pipe 40 is discharged from the vent 61 of the vent valve 60. The pneumatic plug 11 is reset and blocks the pressure relief hole of the back pressure chamber of the upflush inlet valve 10. The upflush inlet valve 10 is closed again (at this time, the water in tank 1 is also stopped being pumped). The pressure in the back pressure chamber of the downflush valve 20 is released, the downflush valve 20 is opened, and the water in the inlet pipe 6 is discharged from the downflush valve 20, realizing the downflush of the toilet. As time continues, the inlet float 5 in the second water tank 3 also descends to the switching position, opening the pressure relief hole of the back pressure chamber of the inlet valve 30. The inlet valve 30 is opened, and the water in the inlet pipe 6 is replenished from the inlet valve 30 to the water tank 1 (in this specific embodiment, it is first replenished to the first water tank 2 in the water tank 1). During the water replenishment process, the switching float 4 rises to a high position before the inlet float 5. The switching float 4 then controls the venting port 61 of the venting valve 60 and the pressure relief port 22 of the back pressure chamber of the downflushing drain valve 20 to close again, and there is no more gas input into the three-way air pipe 40. The downflushing drain valve 20 is closed; the upflushing inlet valve 10 also remains closed. As water continues to be added, the inlet float 5 rises to a high position, and the inlet float 5 re-controls the closure of the pressure relief hole of the back pressure chamber of the inlet valve 30, thus closing the inlet valve 30 and completing the water replenishment of the water tank 1.

[0028] The inlet valve 30, the top flush drain valve 10, and the bottom flush drain valve 20 of this application are all back pressure chamber control structures. The opening and closing of the corresponding valve bodies are controlled by pneumatic or float lifting, thereby effectively realizing water circuit switching. When the top flush drain valve 10 is opened, the water in the inlet pipe 6 is used as the driving force, which, together with the Venturi tube section 123 extending into the water tank 1, draws out the water in the water tank 1, realizing top flush water output. The opening of the bottom flush drain valve 20 directly uses the water in the inlet pipe 6 for bottom spray flushing. In this way, the amount of water used in the water tank 1 is reduced, thereby reducing the volume of the water tank 1. At the same time, no electric parts come into contact with water throughout the process, avoiding potential electrical safety hazards.

[0029] In this embodiment, the first water storage tank 2 and the second water storage tank 3 are arranged horizontally side by side, with basically the same capacity, and both are provided with drainage holes. The drainage hole of the first water storage tank 2 is larger than that of the second water storage tank 3. When draining, the water in the water tank 1 drops rapidly, while the water in the first water storage tank 2 and the second water storage tank 3 is discharged from their respective drainage holes. That is, the water levels of the first water storage tank 2 and the second water storage tank 3 do not drop with the water level in the water tank 1, but drop at a slower speed. Moreover, the discharge speed of the first water storage tank 2 is faster than that of the second water storage tank 3. Therefore, the water level of the first water storage tank 2 drops faster than the water level of the second water storage tank 3, so that the switching float 4 in the first water storage tank 2 drops to the switching position before the water inlet float 5 in the second water storage tank 3.

[0030] Of course, in other embodiments, when it is necessary to control the water level of the first water tank 2 to drop faster than the water level of the second water tank 3, other methods can also be used to achieve this. For example, the inner diameter of the first water tank 2 can be designed to be smaller than the inner diameter of the second water tank 3, so that the water capacity of the first water tank 2 is smaller than that of the second water tank 3. Even if the drain hole is designed to be the same size, the switching float 4 in the first water tank 2 will drop to the switching position before the water inlet float 5 in the second water tank 3.

[0031] In this embodiment, the outlet of the inlet valve 30 is connected to the first water storage tank 2 via a water supply pipe 7. When the inlet valve 30 is opened, water flows into the first water storage tank 2 through the water supply pipe 7, quickly filling the first water storage tank 2 and causing the switching float 4 to rise rapidly to a high position, thereby driving the drain valve 20 to close. Afterward, water overflows from the first water storage tank 2 and flows into the water tank 1. The liquid level in the water tank 1 gradually rises until the inlet float 5 also begins to float. Once the inlet float 5 reaches a high position, the inlet valve 30 is closed, and the water tank 1 is replenished. The above describes a preferred embodiment. Of course, in other embodiments, the method of having the switching float 4 rise to a high position before the inlet float 5 is not limited to this.

[0032] Furthermore, it also includes a switching lever 51, the fulcrum of which is rotatable and can be specifically set on the water tank bracket or other valve body. The first end of the switching lever 51 is connected to the switching float 4, and the second end corresponds to the vent hole 61 of the vent valve 60 and the pressure relief hole 22 of the back pressure chamber of the down-flushing drain valve 20. When the switching float 4 is in a high position, it blocks the vent hole 61 of the vent valve 60 and the pressure relief hole 22 of the back pressure chamber of the down-flushing drain valve 20 through the switching lever 51. When the switching float 4 descends to the switching position, it opens the vent hole 61 of the vent valve 60 and the pressure relief hole 22 of the back pressure chamber of the down-flushing drain valve 20. Specifically, the vent valve 60 is installed on the down-draft drain valve 20. The pressure relief hole 22 of the back pressure chamber of the down-draft drain valve 20 is adjacent to the vent hole 61 of the vent valve 60. In this way, the second end of the switching lever 51 can effectively control the pressure relief hole 22 of the back pressure chamber of the down-draft drain valve 20 and the vent hole 61 of the vent valve 60 at the same time.

[0033] Specifically, the vent valve 60 mentioned in this embodiment refers to a structure that can be used for venting. It is not limited to the valve body structure, but can also simply refer to a component with a vent hole. For example, a vent hole 61 can be directly opened on the valve body of the down-flush drain valve 20. The part with the vent hole 61 can be the vent valve 60; as long as it can be opened to vent.

[0034] It also includes an inlet lever 52, the first end of which is connected to the inlet float 5, and the second end of which corresponds to the pressure relief hole of the back pressure chamber of the inlet valve 30. When the inlet float 5 is in a high position, the pressure relief hole of the back pressure chamber of the inlet valve 30 is blocked by the switching lever 52. When the inlet float 5 is lowered to the switching position, the pressure relief hole of the back pressure chamber of the inlet valve 30 is opened.

[0035] The corresponding hole is controlled by levers, resulting in a simple structure and reliable operation. Of course, other control methods can also be used in other embodiments.

[0036] Furthermore, the flushing drain pipe 12 is provided with a water inlet 126 that connects to the outlet of the inlet valve 30. With this configuration, in the later stage after the flushing drain valve 10 has finished draining, due to the opening of the inlet valve 30, a water flow from the outlet of the inlet valve 30 flows into the flushing drain pipe 12 through the water inlet 126, supplying water to the flushing brush ring water channel of the toilet, improving the flushing effect, and replenishing the toilet to the water seal state.

[0037] Specifically, the water inlet 126 is located on the rear pipe 122 of the flushing drain pipe 12, which is situated at the rear end of the Venturi pipe section 123. Since the rear pipe 122 is vertically oriented, to prevent water backflow into the water tank 1, a switching plate 127 is hinged to the front end of the flushing drain pipe 12 (specifically the rear pipe 122). This switching plate 127 can swing between blocking the flushing drain pipe 126 and blocking the flushing drain pipe opening at its front end. When the flushing drain valve 10 is opened, the water flow from the flushing drain pipe 12 pushes open the switching plate 127, causing it to cover the flushing drain pipe 126. When the inlet valve 30 is opened, the water flowing from the flushing drain pipe 126 pushes open the switching plate 127, causing it to cover the flushing drain pipe opening at its front end, preventing water backflow into the water tank 1.

[0038] In this embodiment, the three-way air pipe 40 includes a first air pipe 41, a three-way pipe 42, and a second air pipe 43. The first air pipe 41 is connected to the air supply device and the first interface of the three-way pipe 42. The second interface of the three-way pipe 42 (i.e., the first outlet of the three-way air pipe 40) is connected to the pneumatic plug 11. The second air pipe 43 is connected to the third interface of the three-way pipe 42 (i.e., the second outlet of the three-way air pipe) and the vent valve 60, thereby realizing the layout and connection of the three-way air pipe 40.

[0039] Furthermore, a one-way valve 44 is provided on the first air pipe 41. This one-way valve 44 only allows airflow from the air supply device to the three-way pipe 42, and prevents it from flowing out in the opposite direction. Therefore, the one-way valve 44 allows the air supply device to stop when the pneumatic plug 11 opens the pressure relief hole of the back pressure chamber of the upward drain valve 10, thus saving resources. Of course, if this one-way valve 44 is not provided, the air supply device needs to continuously supply air until the vent hole 61 of the vent valve 60 is opened.

[0040] Furthermore, the pneumatic plug 11 includes an air bladder, a plug shell, and an elastic element (a spring in this embodiment). The plug shell has a connecting post with a diameter smaller than the pressure relief hole of the back pressure chamber of the upper flushing drain valve 10. The connecting post passes through the pressure relief hole of the back pressure chamber of the upper flushing drain valve 10. The end of the connecting post forms a plug head with a diameter larger than the pressure relief hole of the back pressure chamber of the upper flushing drain valve. The elastic element applies a spring force to the plug shell so that the plug head seals the pressure relief hole of the back pressure chamber of the upper flushing drain valve. The air bladder is connected to the first outlet of the three-way air pipe 40. The inflation of the air bladder drives the plug shell to move against the spring force of the elastic element, thereby causing the plug head to disengage from the pressure relief hole of the back pressure chamber of the upper flushing drain valve. When the gas in the air bladder is released, the plug head re-seals the pressure relief hole of the back pressure chamber of the upper flushing drain valve 10 under the action of the elastic element.

[0041] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A drainage device for switching water flow in a toilet, comprising a water tank, a water inlet section, a drainage section, and a drive section, characterized in that: The water tank has a first water storage tank and a second water storage tank. A switching float is installed in the first water storage tank and an inlet float is installed in the second water storage tank. The switching float descends to the switching position before the inlet float and rises to the high position before the inlet float. The water inlet section includes a water inlet pipe and a water inlet valve connected to the water inlet pipe. The drainage section includes an upper flush drain valve and a lower flush drain valve connected to the water inlet pipe. The water inlet valve, the upper flush drain valve, and the lower flush drain valve are all back pressure chamber type control structures. The pressure relief hole of the back pressure chamber of the upper flush drain valve is normally closed by a pneumatic plug. The outlet of the upper flush drain valve is connected to an upper flush drain pipe, which extends into the water tank and is equipped with a Venturi tube section. The drive unit includes a three-way air pipe and a vent valve. The air inlet of the three-way air pipe is used to connect to an external air supply device, its first outlet is connected to the pneumatic plug of the upper flush drain valve, and its second outlet is connected to the vent valve. The switching float synchronously controls the opening and closing of the vent hole of the vent valve and the pressure relief hole of the back pressure chamber of the downdraft drain valve; the inlet float controls the opening and closing of the pressure relief hole of the back pressure chamber of the inlet valve.

2. The drainage device for switching water flow in a toilet according to claim 1, characterized in that: The first and second water storage tanks are arranged horizontally side by side and both are provided with drainage holes for drainage. The water level in the first water storage tank drops at a faster rate than that in the second water storage tank, so that the switching float in the first water storage tank drops to the switching position before the inlet float in the second water storage tank.

3. The drainage device for switching water flow in a toilet according to claim 1 or 2, characterized in that: The outlet of the inlet valve is connected to the first water storage tank via a water supply pipe, so that the switching float in the first water storage tank rises to a higher position before the inlet float in the second water storage tank.

4. The drainage device for switching water flow in a toilet according to claim 1, characterized in that: It also includes a switching lever, the first end of which is connected to a switching float, and the second end of which corresponds to the vent hole of the vent valve and the pressure relief hole of the back pressure chamber of the downdraft drain valve. When the switching float is in a high position, the vent hole of the vent valve and the pressure relief hole of the back pressure chamber of the downdraft drain valve are blocked by the switching lever. When the switching float descends to the switching position, the vent hole of the vent valve and the pressure relief hole of the back pressure chamber of the downdraft drain valve are opened.

5. The drainage device for switching water flow in a toilet according to claim 4, characterized in that: The vent valve is installed on the down-draft drain valve, and the pressure relief hole of the back pressure chamber of the down-draft drain valve is arranged adjacent to the vent hole of the vent valve.

6. The drainage device for switching water flow in a toilet according to claim 1, characterized in that: It also includes an inlet lever, the first end of which is connected to an inlet float, and the second end of which corresponds to the pressure relief hole of the back pressure chamber of the inlet valve. When the inlet float is in a high position, the pressure relief hole of the back pressure chamber of the inlet valve is blocked by the switching lever. When the inlet float descends to the switching position, the pressure relief hole of the back pressure chamber of the inlet valve is opened.

7. The drainage device for switching water flow in a toilet according to claim 1, characterized in that: The flushing drain pipe has a water inlet at the outlet end connected to the inlet valve on the rear pipe of the Venturi pipe section. The flushing drain pipe has a switching plate hinged to the front end of the water inlet. The switching plate can swing and switch between blocking the water inlet and blocking the flushing drain pipe opening at the front end of the water inlet.

8. The drainage device for switching water flow in a toilet according to claim 1, characterized in that: The three-way air pipe includes a first air pipe, a three-way pipe, and a second air pipe. The first air pipe is connected to the air supply device and the first interface of the three-way pipe, and the second interface of the three-way pipe is connected to a pneumatic plug. The second air pipe is connected to the third interface of the three-way pipe and a vent valve. A one-way valve is provided on the first air pipe.

9. The drainage device for switching water flow in a toilet according to claim 1 or 8, characterized in that: The pneumatic plug includes an air bladder, a plug shell, and an elastic element. The plug shell has a connecting post with a pressure relief hole smaller than the back pressure chamber of the upper flushing drain valve. The connecting post passes through the pressure relief hole of the back pressure chamber of the upper flushing drain valve. The end of the connecting post forms a plug head with a diameter larger than the pressure relief hole of the back pressure chamber of the upper flushing drain valve. The elastic element applies elastic force to the plug shell so that the plug head blocks the pressure relief hole of the back pressure chamber of the upper flushing drain valve. The air bladder is connected to the first outlet of a three-way air tube. The inflation of the air bladder drives the plug shell to move against the elastic force of the elastic element, thereby causing the plug head to disengage from the pressure relief hole of the back pressure chamber of the upper flushing drain valve.

10. A toilet, characterized in that: The device includes at least the water path switching drainage device for a toilet as described in any one of claims 1 to 9, wherein the upper flush drain pipe is connected to the upper flush brush ring water channel of the toilet, and the outlet end of the lower flush drain valve is connected to the lower spray channel of the toilet.

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