A non-electric driving toilet foam generating system using venturi effect

Abstract

The application discloses a Venturi effect based electricity-free driving toilet foam generating system, and belongs to the technical field of sanitary wares. The system comprises a foaming device, a switch, an active agent container and a connecting pipeline. The foaming device is internally provided with a liquid inlet, an active agent liquid inlet, an air inlet and a first jetting port and a second jetting port connected in sequence. The first jetting port is arranged in a decreasing manner along the fluid flow direction, and the diameter ratio of the first jetting port and the second jetting port is 1:1-8:1, so as to realize water flow pressure boosting and Venturi negative pressure formation. The switch is internally provided with an active agent pipe clamp, which can be used for linkage control of active agent supply according to water flow opening and closing. The foaming device is further provided with a runner and a duckbill structure. The application utilizes the principle of fluid dynamics, realizes water flow self-pressurization through a specially designed jetting port structure, automatically sucks in air and active agent for mixing without electricity, generates fine and uniformly covered foam through runner disturbance, and has the advantages of compact structure, convenient installation, water saving and splash prevention, and adaptation to toilets and squatting toilets.

Description

Technical Field

[0001] This invention relates to the field of bathroom equipment technology, and more specifically to an electric-free toilet foam generation system utilizing the Venturi effect. Background Technology

[0002] With increasing public health awareness, toilet foam covering technology has been widely adopted due to its effectiveness in preventing odors, splashes, and lubricating the toilet bowl's inner walls. Existing toilet foam generation systems are mainly divided into two categories: One type is the electric pumping system. This type of system relies on a miniature motor and a water pump to forcibly mix the surfactant and water. However, it has a complex structure, high manufacturing cost, and drawbacks such as easy motor burnout, high noise, and high energy consumption, making it particularly unsuitable for older residential areas or environments without electricity.

[0003] Second is the Venturi jet type. This type of device uses negative pressure of water flow to draw in the surfactant. Although it achieves electric-free operation, the existing technology still has significant shortcomings: (1) Low mixing efficiency. The traditional Venturi tube has a simple structure. The surfactant drawn in by negative pressure is not mixed with the air sufficiently, resulting in large, few, and easily broken foams with uneven coverage; (2) Poor structural adaptability. Most existing devices are fixed structures, which cannot meet the installation requirements of both toilets and squat toilets at the same time. Moreover, they lack a reliable switch linkage mechanism, which often leads to surfactant leakage after water is turned off.

[0004] Therefore, there is an urgent need for a toilet foam generation system that is simple in structure, requires no electricity, and can achieve high-pressure mixing and fine foaming through fluid dynamics optimization. Summary of the Invention

[0005] In view of the problems pointed out in the background art, the present invention aims to overcome the shortcomings of the prior art and provide an electric-free toilet foam generation system utilizing the Venturi effect. This device is simple to install and utilizes fluid dynamics principles. Through a specially designed jet nozzle structure, it achieves self-pressurization of water flow, automatically drawing in air and mixing it with surfactants without electricity. The mixture is then agitated by a rotating wheel to generate fine and evenly distributed foam. It has the advantages of compact structure, convenient installation, water saving and splash prevention, and compatibility with both seated and squat toilets.

[0006] Furthermore, a non-electrically driven toilet foam generation system utilizing the Venturi effect includes: a foaming device, a switch, and an active agent container.

[0007] Specifically, the foaming device includes a liquid inlet, an active agent inlet, a first spray port, a second spray port, an air inlet, a fixing point, and a rotating wheel. The cross-sectional area of ​​the first spray port gradually decreases along the fluid flow direction, thereby increasing the liquid pressure. The diameter ratio of the second spray port to the first spray port is 1:1 to 8:1, with the diameter of the second spray port being larger than that of the first spray port.

[0008] Furthermore, the first spray nozzle and the surfactant inlet are arranged side by side or nested. After the water flows in through the inlet, it is sprayed out at high speed through the first spray nozzle, forming a Venturi negative pressure, automatically drawing in air, which is initially mixed with the surfactant and then sprayed out through the second spray nozzle. After being agitated and mixed by the rotating wheel, foam is output.

[0009] Furthermore, the surfactant container is connected to the foaming device via an surfactant tube and a switch. The inlet pipe connects the water source to the switch, and the outlet pipe connects the switch to the foaming device.

[0010] Further preferably, the switch includes a handle, an inlet, an outlet, and an surfactant clamp, used for manually controlling the water flow and coordinating the surfactant supply. Specifically, the switch also includes a first pipe and a second pipe. When the handle is open, the surfactant clamp is released, the first pipe is open, and the surfactant flows into the foaming device. When the handle is closed, the second clamp clamps the first pipe, the first pipe is cut off, and the liquid supply stops. The second pipe serves to fix the surfactant tube, and the clamping part of the second clamp is provided with a protrusion that presses against the first pipe.

[0011] Furthermore, the foaming device also includes a duckbill, which comprises a distributing plate and a fixing column for guiding and stabilizing the flow. The duckbill is fixed by clips, screws, or adhesive.

[0012] It should be noted that the duckbill is not an essential part; the foaming device can produce satisfactory foam even without it. However, with the duckbill, the foam produced by the rotating wheel is more even and does not splash, resulting in a better user experience.

[0013] Furthermore, the impeller includes a shaft, a shaft hole, and impeller blades. The impeller blades are propeller-shaped or blade-shaped, and there are 2 to 7 blades. The radial gap between the edge of the impeller blade and the inner wall of the foaming device is 5% to 40% of the impeller diameter. The impeller rotates due to the impact of water flow on the impeller blades, which drives the mixed liquid to mix and produce abundant foam.

[0014] More preferably, the first and second jet nozzles are coaxial and positioned on one side of the rotor. This arrangement allows the water flow from the nozzles to be sprayed onto the rotor more effectively, causing the rotor to rotate and creating a dynamic mixing effect.

[0015] More preferably, the foaming device can adopt a "tube-outside-tube" structure, wherein the surfactant inlet surrounds the outside of the first spray port, and the surfactant tube is outside the water outlet tube.

[0016] More preferably, the foaming device can adopt a "tube-in-tube" structure, wherein the surfactant inlet is embedded inside the inlet, the outer diameter of the surfactant tube is smaller than the inner diameter of the outlet tube, and the surfactant tube is inside the outlet tube, forming a tube-in-tube form. The outlet tube and the surfactant tube are connected by a T-junction, and the surfactant tube is sealed at one end of the T-junction by a rubber tube or sealant.

[0017] Furthermore, the foaming device is installed on the inner wall of the toilet bowl via a fixing point, or installed above the edge of the toilet bowl, with the outlet facing the inner cavity of the toilet bowl; the foaming device is fixed by adhesive.

[0018] Furthermore, a method for installing and using an electric-free toilet foam generation system utilizing the Venturi effect includes the following steps: ① Installation Preparation: Secure the foaming device to the inner wall of the toilet bowl or above the edge of the squat toilet using the fixing points, ensuring the outlet faces the inner cavity of the toilet bowl. Connect the inlet pipe to the water source and the inlet of the switch, and connect the outlet pipe to the outlet of the switch and the inlet of the foaming device. Connect the surfactant container to the surfactant inlet via the surfactant tube and the surfactant tube clamp of the switch.

[0019] ② System Debugging: Turn on the water source and operate the switch handle to the open position. Observe whether the water flows into the foaming device through the inlet and is sprayed out at high speed through the first spray nozzle, forming a Venturi negative pressure. This automatically draws in air, and the surfactant flows out of the surfactant container through siphon into the space of the first spray nozzle for mixing. After mixing, it is sprayed onto the rotating wheel through the second spray nozzle for thorough dynamic mixing and foam generation. Confirm that the foam shape is uniform, the coverage area meets the standard, and there is no obvious splashing or flow interruption.

[0020] ③ Operation: Before each use of the toilet, manually turn on the water flow by pulling the handle. The system will automatically generate and spray foam. After use, return the handle to the neutral position to turn off the water flow. This will cut off the surfactant supply and stop the system from working.

[0021] ④ Maintenance and Replacement: Regularly check whether the surfactant tube is clogged or aged, whether the duckbill is blocked by dirt, and whether the rotor rotates freely. If the surfactant needs to be replaced, simply unscrew the surfactant container or pull out the surfactant tube to replenish or replace it; there is no need to disassemble the foaming device.

[0022] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. Achieve precise linkage between "electricity-free operation" and "on-demand liquid supply." Unlike traditional electric pumps or simple gravity dripping, this invention achieves self-synchronization of the water path and surfactant path through a purely mechanical structure. When the handle is opened, the water path is opened and the tube clamp is automatically released to supply liquid; when closed, the tube clamp tightens and cuts off the surfactant. This design completely eliminates the problem of surfactant leakage in standby mode, avoiding waste and pollution, while requiring no electricity, making it energy-saving and environmentally friendly.

[0023] 2. Modular structure design, strong compatibility, and convenient installation. This invention breaks through the limitations of complex installation of traditional foam generators. By providing two modular options, "pipe-in-pipe" (space-saving and aesthetically pleasing) and "pipe-outside-pipe" (easy installation and maintenance), it can flexibly adapt to the structures of different brands and models of toilets (3) or squat toilets (4). This "one machine, two uses" compatible design greatly reduces the installation threshold and after-sales costs.

[0024] 3. Optimized fluid dynamics for high and stable foaming efficiency. Utilizing a Laval nozzle design with a "contraction-expansion" mechanism, a strong negative pressure is first created at the first injection port to efficiently draw in air and surfactant for initial mixing. Subsequently, diffusion and refinement occur at the second injection port. Combined with the shear disturbance of the rotating wheel, this results in fine, uniformly distributed foam, effectively solving the problems of coarse foam and easy collapse inherent in traditional Venturi devices. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of the "outer tube" of the foaming device (1) of the present invention.

[0027] Figure 2 This is a cross-sectional structural diagram of the "outer tube" of the foaming device (1) of the present invention.

[0028] Figure 3 This is a perspective three-dimensional structural diagram of the "outer tube" of the foaming device (1) of the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of the "inner tube" of the foaming device (1) of the present invention.

[0030] Figure 5 This is a cross-sectional structural diagram of the "inner tube" of the foaming device (1) of the present invention.

[0031] Figure 6 This is a perspective three-dimensional structural diagram of the "inner tube" of the foaming device (1) of the present invention.

[0032] Figure 7 This is a three-dimensional structural diagram of the switch (2) of the present invention in the closed state.

[0033] Figure 8This is a three-dimensional structural diagram of the switch (2) of the present invention in the open state.

[0034] Figure 9 This is a perspective three-dimensional structural diagram of the switch (2) of the present invention in the closed state.

[0035] Figure 10 This is a three-dimensional structural diagram of the rotating wheel (17) of the present invention.

[0036] Figure 11 This is a three-dimensional structural diagram of the toilet (3) of the present invention in a usage scenario.

[0037] Figure 12 This is a three-dimensional structural diagram of the squat toilet (4) of the present invention in a usage scenario.

[0038] Figure 13 This is a cross-sectional structural diagram of Embodiment 2 of the foaming device (1) of the present invention.

[0039] Figure 14 This is a perspective three-dimensional structural diagram of the foaming device (1) of the present invention (Comparative Example 1).

[0040] The following are the labels in the attached diagram: 1, foaming device; 11, liquid inlet; 12, surfactant inlet; 13, first spray nozzle; 14, second spray nozzle; 15, air inlet; 16, fixing point; 17, rotating wheel; 171, rotating shaft; 172, shaft hole; 173, rotating wheel blade; 18, duckbill; 181, distributing plate; 182, fixing column; 2, switch; 211, handle; 212, water inlet; 213, water outlet; 22, surfactant tube clamp; 221, tube clamp one; 222, tube clamp two; 223, pipe one; 224, pipe two; 3, toilet; 4, squat toilet; 5, surfactant container; 51, surfactant tube; 52, water inlet pipe; 53, water outlet pipe; 54, tee. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Reference Figures 1 to 12As shown, this invention provides a non-electrically driven toilet foam generating system utilizing the Venturi effect, comprising: a foaming device 1, a switch 2, and an surfactant container 5. The foaming device 1 includes a liquid inlet 11, a surfactant inlet 12, a first spray nozzle 13, a second spray nozzle 14, an air inlet 15, a fixing point 16, and a rotating wheel 17. The flow cross-sectional area of ​​the first spray nozzle 13 gradually decreases along the fluid flow direction. The diameter ratio of the second spray nozzle 14 to the first spray nozzle 13 is 1:1 to 8:1. The diameter of the second spray nozzle 14 is larger than the diameter of the first spray nozzle 13; this arrangement facilitates the mixing of gas, water, and surfactant, and prevents backflow and splashing when sprayed from the second spray nozzle 14.

[0043] More specifically, the first spray nozzle 13 and the surfactant inlet 12 are arranged side-by-side or nested. After water enters through the inlet 11, it is sprayed out at high speed through the first spray nozzle 13, creating a Venturi negative pressure that automatically draws in air. After initial mixing with the surfactant, the air is sprayed out through the second spray nozzle 14, and then agitated and mixed by the rotating wheel 17 before being output as foam. The diffusion design of the second spray nozzle 14 can reduce the flow rate and increase the mixing space. Combined with the shear disturbance of the rotating wheel 17, this further improves the uniformity and stability of the foam. The first spray nozzle 13 and the second spray nozzle 14 are coaxial and located on one side of the rotating wheel 17. This arrangement allows the water flow from the spray nozzles to be sprayed onto the rotating wheel 17 more effectively, causing the rotating wheel 17 to rotate and produce a dynamic mixing effect.

[0044] The surfactant container 5 is connected to the foaming device 1 via the surfactant tube 51 and the switch 2. The water inlet pipe 52 is connected to the water source and the switch 2, and the water outlet pipe 53 is connected to the switch 2 and the foaming device 1.

[0045] Reference Figures 7-9 As shown, switch 2 includes a handle 211, an inlet 212, an outlet 213, and an surfactant clamp 22, used to manually control the water flow and control the surfactant supply. Switch 2 also includes a first pipe 223 and a second pipe 224. When the handle 211 is open, the surfactant clamp 22 is released, and the first pipe 223 is open, allowing the surfactant to flow into the foaming device 1. When the handle 211 is closed, the surfactant clamp 22 clamps, the first pipe 223 is cut off, and the liquid supply stops. The second pipe 224 serves to fix the surfactant tube 51. The clamping part of the second pipe clamp 222 has a protrusion that presses against the first pipe 223. Due to the height difference between the surfactant container 5 and the foaming device 1, the surfactant flows slowly due to gravity. When switch 2 is opened again, the surfactant slowly flows into the foaming device 1 through gravity and siphon action.

[0046] It should be noted that this switch 2 is a linkage method. It can also be used as a separate unit to control the water inlet and surfactant pipelines separately, which can also achieve the existing functions, but it will increase the complexity of operation and reduce the user experience.

[0047] Reference Figures 1 to 6 As shown, the foaming device 1 also includes a duckbill 18, which comprises a distributing plate 181 and a fixing column 182 for guiding and stabilizing the flow. The duckbill 18 is fixed by clips, screws, or adhesive. It should be noted that the duckbill 18 is not an essential part; the foaming device 1 can still foam without it, and the effect will meet the requirements. However, with the duckbill 18, the flow is guided, resulting in more uniform foam after passing through the rotating wheel 17, and preventing splashing, thus providing a better user experience.

[0048] Reference Figure 10 As shown, the rotor 17 includes a shaft 171, a shaft hole 172, and rotor blades 173. The rotor blades 173 are propeller-shaped or blade-shaped, and there are 2 to 7 blades. The radial gap between the edge of the rotor blades 173 and the inner wall of the foaming device 1 is 5% to 40% of the diameter of the rotor 17. The rotor 17 rotates due to the impact of water flow on the rotor blades 173, which drives the mixed liquid to mix and produce abundant foam. The gap between the rotor blades 173 and the inner wall should be kept appropriate. If the gap is too small, the rotor 17 will easily rub against the inner wall, affecting the mixing effect. After many experiments, it was found that if the gap is too small, the foam generation rate will decrease. If the gap is too large, the water flow cannot effectively impact the rotor 17, resulting in poor dynamic mixing and a decrease in foaming rate and foam stability.

[0049] Reference Figures 1-3 and Figure 11 As shown, the foaming device 1 adopts a "pipe-outside-pipe" structure, wherein the surfactant inlet 12 surrounds the outside of the first spray port 13, and the surfactant pipe 51 is outside the water outlet pipe 53. This method is simple to install, and the two sets of pipelines do not interfere with each other.

[0050] Reference Figure 4-6 and Figure 12 As shown, the foaming device 1 adopts a "tube-in-tube" structure, in which the surfactant inlet 12 is embedded inside the inlet 11, the outer diameter of the surfactant tube 51 is smaller than the inner diameter of the outlet tube 53, and the surfactant tube 51 is inside the outlet tube 53, forming a tube-in-tube configuration. They are connected by a tee 54, and one end of the surfactant tube 51 is sealed with a rubber tube or sealant. This method is slightly more complex to install, but the tube-in-tube design is more aesthetically pleasing.

[0051] Reference Figure 11-12 As shown, the foaming device 1 is installed on the inner wall of the toilet bowl 3 via the fixing point 16, or installed above the edge of the toilet bowl 4, with the outlet facing the inner cavity of the toilet bowl. The foaming device 1 is fixed by adhesive.

[0052] Reference Figure 11-12 As shown, the installation and use method of the electric-free toilet foam generation system utilizing the Venturi effect includes the following steps: ① Installation Preparation: Fix the foaming device 1 to the inner wall of the toilet bowl 3 or above the edge of the squat toilet 4 using the fixing point 16, ensuring that the outlet faces the inner cavity of the toilet bowl. Connect the water inlet pipe 52 to the water source and the water inlet 212 of the switch 2, and connect the water outlet pipe 53 to the water outlet 213 of the switch 2 and the liquid inlet 11 of the foaming device 1. Connect the surfactant container 5 to the surfactant inlet 12 via the surfactant tube 51 and the surfactant tube clamp 22 of the switch 2.

[0053] ② System Debugging: Turn on the water source and operate the handle 211 of switch 2 to the open position. Observe whether the water flows into the foaming device 1 through the inlet 11 and is sprayed out at high speed through the first spray nozzle 13, forming a Venturi negative pressure, automatically drawing in air. The surfactant flows out from the surfactant container 5 through siphon into the space in the first spray nozzle 13 for initial mixing. After mixing, it is sprayed out through the second spray nozzle 14 onto the rotor 17 for full dynamic mixing, generating foam. Confirm that the foam shape is uniform, the coverage area meets the standard, and there is no obvious splashing or flow interruption.

[0054] ③ Operation: Before each use of the toilet, manually turn on the water flow by pulling handle 211. The system will automatically generate and spray foam. After use, return handle 211 to the starting position to turn off the water flow, which will also cut off the surfactant supply and stop the system from working.

[0055] ④ Maintenance and Replacement: Regularly check whether the surfactant tube 51 is clogged or aged, whether the duckbill 18 is blocked by dirt, and whether the rotor 17 rotates freely. If the surfactant needs to be replaced, the surfactant container 5 can be unscrewed or the surfactant tube 51 can be pulled out for replenishment or replacement without disassembling the foaming device 1.

[0056] The working principle and beneficial effects of the present invention will be specifically illustrated below through examples. The following examples and comparative examples were conducted under the same conditions: the same pipeline, the same concentration of surfactant, the surfactant tube 51 with an outer diameter of 2.3 mm, and the same water pressure. All examples utilize… Figures 1-3 Test products of the same size. Example 1

[0057] Reference Figures 1-3 As shown, the first injection port 13 has a diameter of 2 mm, and the second injection port 14 has a diameter of 12 mm; the distance between the rotor blade 173 and the inner wall is 25% of the diameter of the rotor 17. The duckbill 18 uses... Figure 2-3 As shown, the surfactant tube 51 adopts an outer tube design. Example 2

[0058] Reference Figure 13 As shown, the first injection port 13 has a diameter of 2 mm, and the second injection port 14 has a diameter of 5 mm; the distance between the rotor blade 173 and the inner wall is 25% of the diameter of the rotor 17. The duckbill 18 uses... Figure 2-3 As shown, the surfactant tube 51 adopts an outer tube design. Example 3

[0059] Reference Figures 1-3 As shown, the first injection port 13 has a diameter of 2 mm, and the second injection port 14 has a diameter of 12 mm; the distance between the rotor blade 173 and the inner wall is 8% of the diameter of the rotor 17. The duckbill 18 uses... Figure 2-3 As shown, the surfactant tube 51 adopts an outer tube design. Example 4

[0060] Reference Figures 1-3 As shown, the first injection port 13 has a diameter of 3 mm, and the second injection port 14 has a diameter of 12 mm; the distance between the rotor blade 173 and the inner wall is 25% of the diameter of the rotor 17. The duckbill 18 uses... Figure 2-3 As shown, the surfactant tube 51 is a tube-in-tube design, with the surfactant tube 51 extending out of the first spray port 13, meaning that the surfactant inlet 12 is nested inside the first spray port 13. Example 5

[0061] Reference Figures 1-3 As shown, the diameter of the first injection port 13 is 2 mm, and the diameter of the second injection port 14 is 12 mm; the distance between the rotor blade 173 and the inner wall is 25% of the diameter of the rotor 17. There is no duckbill 18, and the activator tube 51 adopts an outer tube design.

[0062] Comparative Example 1: Reference Figure 14 As shown, the first injection port 13 has a diameter of 3mm, and the second injection port 14 has a diameter of 5mm; there is no rotor 17. The duckbill 18 adopts... Figure 13 As shown, a static mixing method is adopted, and the surfactant tube 51 is an outer tube.

[0063] Comparative Example 2: Reference Figures 1-3 As shown, the first injection port 13 has a diameter of 2 mm, and there is no second injection port 14; the distance between the rotor blade 173 and the inner wall is 25% of the diameter of the rotor 17. The duckbill 18 uses... Figure 2-3 As shown, the surfactant tube 51 adopts an outer tube design.

[0064] Turn on the switch and record the amount of foam produced, foaming rate (foam weight / weight of unfoamed liquid), and foaming effect after 10 seconds. From the table above, under the same time and flow rate, Example 1 is the best, with very uniform foam and the highest foaming rate. Comparing Example 1 and Example 5, the difference is the absence of the duckbill 18; the foaming rate is basically the same, but Example 1 has more large bubbles, and the uniformity is relatively worse than Example 1. Comparing Example 1 and Example 2, the foam in Example 2 is finer than that in Example 1, but the foaming rate is slightly lower. Example 3, compared to Example 1, has a different diameter for the rotor 17; the rotor is larger, the gap is smaller, and the foam is finer, but the foaming rate is lower than that in Example 1. Example 4 uses a tube-in-tube method, which results in a lower foaming rate and poorer foam uniformity than Example 1. Comparing Examples 1-5 to Comparative Example 1, the static mixing method has the worst foaming rate and uniformity. Comparing Example 1 to Comparative Example 2, Example 1 lacks the second nozzle 14, resulting in a lower foaming rate and uniformity than Example 1.

[0065] In summary, this invention has a simple and ingenious structure, is easy to install, can efficiently utilize water flow to generate foam for deodorization, and has low manufacturing cost, making it highly practical and promising for widespread application.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A non-electrically driven toilet foam generation system utilizing the Venturi effect, characterized in that, include: Foaming device (1), switch (2), surfactant container (5); The foaming device (1) includes a liquid inlet (11), an active agent liquid inlet (12), a first spray port (13), a second spray port (14), an air inlet (15), a fixing point (16), and a rotating wheel (17), wherein the flow cross-sectional area of ​​the first spray port (13) gradually decreases along the fluid flow direction, and the ratio of the diameter of the second spray port (14) to the diameter of the first spray port (13) is 1:1 to 8:1; The first spray nozzle (13) and the surfactant inlet (12) are arranged side by side or nested. After the water flows in through the inlet (11), it is sprayed out at high speed through the first spray nozzle (13) to form a Venturi negative pressure, automatically sucking in air, which is initially mixed with the surfactant and then sprayed out through the second spray nozzle (14). After being agitated and mixed by the rotating wheel (17), foam is output. The surfactant container (5) is connected to the foaming device (1) via the surfactant tube (51) and the switch (2); the water inlet pipe (52) is connected to the water source and the switch (2); the water outlet pipe (53) is connected to the switch (2) and the foaming device (1).

2. The electric-free toilet foam generation system utilizing the Venturi effect according to claim 1, characterized in that, The switch (2) includes a handle (211), an inlet (212), an outlet (213), and an surfactant clamp (22), which are used to manually control the opening and closing of the water flow and to control the supply of surfactant.

3. The non-electrically driven toilet foam generation system utilizing the Venturi effect according to claim 1, characterized in that, The foaming device (1) also includes a duckbill (18), which includes a liquid distribution plate (181) and a fixing column (182) for guiding and stabilizing the flow; the duckbill (18) is fixed by a snap fastener, screw or adhesive.

4. A non-electrically driven toilet foam generation system utilizing the Venturi effect according to claim 1, characterized in that, The wheel (17) includes a shaft (171), a shaft hole (172), and a wheel blade (173). The wheel blade (173) is propeller-shaped or blade-shaped, and there are 2 to 7 blades. The radial gap between the edge of the wheel blade (173) and the inner wall of the foaming device (1) is 5% to 40% of the diameter of the wheel (17).

5. A non-electrically driven toilet foam generation system utilizing the Venturi effect according to claim 1, characterized in that, The foaming device (1) adopts a "pipe outside pipe" structure, wherein the surfactant inlet (12) surrounds the outside of the first spray port (13), and the surfactant tube (51) is outside the water outlet pipe (53).

6. A non-electrically driven toilet foam generation system utilizing the Venturi effect according to claim 1, characterized in that, The foaming device (1) adopts a "pipe-in-pipe" structure, wherein the active agent inlet (12) is embedded inside the inlet (11), the outer diameter of the active agent tube (51) is smaller than the inner diameter of the outlet tube (53), the active agent tube (51) is inside the outlet tube (53), and is in the form of a pipe-in-pipe, connected by a tee (54), and the active agent tube (51) is sealed at one end of the tee (54) by a rubber tube or sealant.

7. A non-electrically driven toilet foam generation system utilizing the Venturi effect according to claim 1, characterized in that, The first injection port (13) is coaxial with the second injection port (14) and is located on one side of the rotating wheel (17).

8. A non-electrically driven toilet foam generation system utilizing the Venturi effect according to claim 2, characterized in that, The switch (2) also includes a first pipe (223) and a second pipe (224). When the handle (211) is opened, the activator clamp (22) is released, the first pipe (223) is opened, and the activator flows into the foaming device (1). When the handle (211) is closed, the activator clamp (22) is clamped, the first pipe (223) is cut off, and the liquid supply stops.

9. A non-electrically driven toilet foam generation system utilizing the Venturi effect according to claim 1, characterized in that, The foaming device (1) is installed on the inner wall of the toilet (3) through the fixing point (16), or installed above the edge of the toilet (4), with the outlet facing the inner cavity of the toilet; the foaming device (1) is fixed by adhesive.

10. A method for installing and using a non-electrically driven toilet foam generation system utilizing the Venturi effect according to any one of claims 1-9, characterized in that, Includes the following steps: ① Installation preparation: Fix the foaming device (1) to the inner wall of the toilet (3) or above the edge of the squat toilet (4) through the fixing point (16), ensuring that the outlet faces the inner cavity of the toilet; connect the water inlet pipe (52) to the water source and the water inlet (212) of the switch (2), and connect the water outlet pipe (53) to the water outlet (213) of the switch (2) and the liquid inlet (11) of the foaming device (1); connect the surfactant container (5) to the surfactant inlet (12) through the surfactant tube (51) and the surfactant tube clamp (22) of the switch (2); ② System debugging: Turn on the water source, operate the handle (211) of the switch (2) to the open position, observe whether the water flow enters the foaming device (1) through the liquid inlet (11) and is sprayed out at high speed at the first spray port (13) to form a Venturi negative pressure, automatically sucking in air, and the surfactant flows out from the surfactant container (5) through siphon into the space in the first spray port (13) for preliminary mixing. After mixing, it is sprayed out through the second spray port (14) onto the rotating wheel (17) for full dynamic mixing to generate foam; confirm that the foam shape is uniform, the coverage area meets the standard, and there is no obvious splashing or flow interruption; ③ Operation: Before each use of the toilet, manually turn on the handle (211) to turn on the water flow. The system will automatically generate and spray foam. After use, turn off the handle (211) to turn off the water flow. The surfactant supply will be cut off and the system will stop working. ④ Maintenance and replacement: Regularly check whether the surfactant tube (51) is blocked or aged, whether the duckbill (18) is blocked by dirt, and whether the wheel (17) rotates flexibly; if the surfactant needs to be replaced, the surfactant container (5) can be unscrewed or the surfactant tube (51) can be pulled out directly for replenishment or replacement without disassembling the foaming device (1).

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