A foam generating apparatus and a foam generating method

Abstract

This invention relates to the field of foaming machine technology, and in particular to a foam generating device and method, comprising a foam liquid container and a foaming nozzle, and further including an air supply component, a mixing tank suitable for water storage, a liquid delivery channel, and an air delivery channel. The foam liquid container is connected in series with the mixing tank and the foaming nozzle through the liquid delivery channel, and the air supply component is connected to the foam liquid container and the foaming nozzle respectively through the air delivery channel. This invention provides a foam generating device and method that effectively reduces equipment failure rates, simplifies equipment structure, lowers manufacturing costs, and eliminates the cumbersome step of pre-mixing and diluting water and liquid, making it more convenient to use.

Description

Technical Field

[0001] This invention relates to the field of foaming machine technology, and in particular to a foam generating device and a foam generating method. Background Technology

[0002] A foam generating device, also known as a foam generator, is a device that uses a foaming agent aqueous solution to produce foam. There are two essential factors for foam formation: a foaming agent solution and air. Both are indispensable. Without a foaming agent solution, the liquid film surrounding the gas will not form, and there will be no bubbles. However, even with a foaming agent solution, bubbles cannot form without gas.

[0003] Currently, foam generating devices on the market can be broadly divided into two categories: The first type uses a liquid pump to extract the liquid, and then combines it with a water and air pump to generate foam. The drawbacks of this method are its complex structure, high manufacturing cost, and the fact that after the liquid pump has been extracting foam liquid for a long time, the diaphragm inside the pump can easily become stuck due to the viscosity of the foam liquid itself, causing the pump to stop working properly and resulting in a high failure rate. The second type involves diluting the foam liquid with water in a certain ratio and then directly extracting it with a liquid-air mixing pump to generate foam. The drawback of this method is that the water and foam liquid need to be mixed and diluted in advance, which results in a low number of uses under the same container conditions, requiring frequent addition of the mixture for remixing, making the operation cumbersome and extremely inconvenient to use. Summary of the Invention

[0004] This invention provides a foam generating device that can effectively reduce the failure rate of the equipment. It has a simple structure, low manufacturing cost, and eliminates the tedious step of mixing and diluting water and liquid in advance, making it more convenient to use.

[0005] The present invention provides a foam generating device, including a foam liquid container and a foaming nozzle, and further including an air supply component, a mixing tank suitable for water storage, a liquid delivery channel and an air delivery channel. The foam liquid container is connected in series with the mixing tank and the foaming nozzle through the liquid delivery channel, and the air supply component is connected to the foam liquid container and the foaming nozzle through the air delivery channel.

[0006] According to a foam generating device provided by the present invention, the infusion channel includes a suction pipe, one end of which is connected to the mixing tank, and the other end is connected to the foam liquid container and extends to the bottom of the foam liquid container.

[0007] According to a foam generating device provided by the present invention, the liquid extraction pipe is connected to a one-way valve, and the output end of the one-way valve is connected to the mixing tank through the liquid extraction pipe. The one-way valve can prevent water in the mixing tank from flowing back into the foam liquid container after foaming is completed.

[0008] According to a foam generating device provided by the present invention, the infusion channel further includes an outlet pipe, one end of which is connected to the mixing tank and the other end of which is connected to the foaming nozzle.

[0009] According to a foam generating device provided by the present invention, the gas supply channel is provided with a first three-way valve, and the gas supply component is connected to the foam liquid container and the liquid outlet pipe respectively through the first three-way valve.

[0010] According to a foam generating device provided by the present invention, a filter screen is provided inside the foaming nozzle.

[0011] According to a foam generating device provided by the present invention, the mixing tank is provided with an inlet for connecting an external water source.

[0012] According to a foam generating device provided by the present invention, the opening of the foam liquid container is provided with a sealing cap, and the liquid delivery channel and the gas delivery channel are respectively connected to the interior of the foam liquid container through the sealing cap.

[0013] According to the foam generating device provided by the present invention, a second three-way valve is further included, with both ends of the second three-way valve connected to the liquid outlet pipe and the other end of the second three-way valve connected to the gas delivery channel, so that the gas delivery channel and the liquid outlet pipe are interconnected.

[0014] This invention also provides a foam generation method based on a foam generation device of this invention. Air generated by an air supply component is delivered to a foam liquid container and an outlet pipe through an air delivery channel. The air entering the foam liquid container from the air supply component pressurizes the inside of the foam liquid container, causing the foam liquid in the foam liquid container to sequentially enter the extraction pipe and the mixing tank. The foam liquid entering the mixing tank mixes with water and fills the interior of the mixing tank. Then, it is output from the top outlet of the mixing tank and sequentially delivered to the outlet pipe and the foaming nozzle. The air entering the outlet pipe from the air supply component mixes with the foam liquid and water in the outlet pipe and then enters the foaming nozzle together, through which foam is output to the outside.

[0015] This invention provides a foam generating device, comprising an air supply component, a mixing tank suitable for water storage, a liquid delivery channel, and an air delivery channel. Since the foam liquid container is connected in series with the mixing tank and the foaming nozzle via the liquid delivery channel, the foam liquid stored in the container can first enter the mixing tank through the liquid delivery channel and mix with the water in the mixing tank to form a mixture, which then continues to flow along the liquid delivery channel to the foaming nozzle. Simultaneously, since the air supply component is connected to both the foam liquid container and the foaming nozzle via the air delivery channel, air can be output in two separate paths. Therefore, on the one hand, the air supply component can input air pressure into the foam liquid container through the air delivery channel, pressurizing the inside of the foam liquid container and using the high air pressure to promote foam generation. The foam liquid in the foam liquid container automatically enters the delivery channel and flows to the mixing tank and foaming nozzle. Meanwhile, the air supply component delivers air to the foaming nozzle through the air delivery channel to aerate the mixture, achieving a thorough mixing of foam liquid, water, and air. Finally, foam is sprayed out from the foaming nozzle. The entire foam generation process uses only one air supply component, which uses air pressure to extract the foam liquid from the container and mix it with water. Therefore, a liquid pump is unnecessary, completely eliminating the problem of pump failure and effectively reducing the equipment failure rate. Furthermore, the structure is simple, the manufacturing cost is low, and there is no need to pre-mix and dilute the foam liquid and water, saving cumbersome pre-treatment steps and making it more convenient to use. Therefore, this foam generating device effectively reduces the equipment failure rate, has a simple structure, low manufacturing cost, and eliminates the cumbersome steps of pre-mixing and diluting water and liquid, making it more convenient to use.

[0016] Furthermore, in the foam generating device provided by this invention, the infusion channel includes a suction pipe, one end of which is connected to a mixing tank, and the other end is connected to a foam liquid container and extends to the bottom of the foam liquid container. The suction pipe connects the foam liquid container and the mixing tank, enabling the transfer of foam liquid from the foam liquid container into the mixing tank. Simultaneously, since the other end of the suction pipe extends to the bottom of the foam liquid container, it facilitates the complete extraction of foam liquid from the container, making it convenient to use.

[0017] Furthermore, in the foam generating device provided by this invention, the extraction pipe is connected to a one-way valve, and the output end of the one-way valve is connected to the mixing tank through the extraction pipe. Under the guiding action of the one-way valve, it helps the foam liquid to flow in one direction, ensuring that the foam liquid can only be transported from the foam liquid container to the mixing tank, and can effectively prevent the mixed liquid in the mixing tank from flowing back into the foam liquid container, affecting normal operation.

[0018] Furthermore, in the foam generating device provided by the present invention, the mixing tank is provided with an inlet for connecting an external water source. In use, the inlet can be connected to an external water pipe to allow external water to enter the mixing tank and mix with the foam liquid. It is also convenient to replenish water in the mixing tank in real time, making it easy to use.

[0019] Furthermore, in the foam generating device provided by this invention, a first three-way valve is provided on the air supply channel. The air supply component is connected to the foam liquid container and the outlet pipe through the first three-way valve. Under the action of the first three-way valve, the air supply channel can be divided into multiple pipelines, so that the air output from the air pump can be divided into two paths, which are respectively delivered to the foam liquid container and the foaming nozzle in different directions. This allows the air output from the air pump to not only input air pressure into the foam liquid container through the air supply channel, pressurizing the inside of the foam liquid container, and using the high air pressure to cause the foam liquid in the foam liquid container to automatically enter the supply channel and flow to the mixing tank and the foaming nozzle, but also to deliver air to the foaming nozzle through the air supply channel to aerate the mixture, realizing the mixing of foam liquid, water, and air. Finally, foam can be sprayed out from the foaming nozzle. This simplifies the entire foam generation process by using only one air supply component.

[0020] This invention provides a foam generation method in which air generated by an air supply component can be output in two separate paths during operation. On one hand, the air supply component can input air pressure into the foam liquid container through the air delivery channel, pressurizing the inside of the container. This high air pressure forces the foam liquid in the container to automatically enter the delivery channel and flow to the mixing tank and foaming nozzle. On the other hand, the air supply component can also deliver air to the foaming nozzle through the air delivery channel to aerate the mixture, achieving the mixing of foam liquid, water, and air. Finally, foam can be sprayed out from the foaming nozzle. The entire foam generation process can be completed using only one air supply component, which uses air pressure to extract the foam liquid from the container and mix it with water. Therefore, there is no need for a liquid pump, completely eliminating the problem of liquid pump failure and effectively reducing the equipment failure rate. Furthermore, the structure is simple, the manufacturing cost is low, and there is no need to pre-mix and dilute the foam liquid and water, saving cumbersome pretreatment steps and making it more convenient to use. Therefore, the foam generation method of the present invention can effectively reduce the failure rate of equipment, help simplify the equipment structure and reduce the manufacturing cost of equipment, and eliminate the tedious steps of pre-mixing and diluting water and liquid, making it more convenient to use. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a partial structural cross-sectional view of the present invention;

[0024] Figure 3 This is a simplified schematic diagram of a further embodiment of the present invention;

[0025] Figure 4 This is a simplified schematic diagram of a further embodiment of the present invention.

[0026] Attached image captions:

[0027] 1: Foam liquid container, 2: Foaming nozzle, 3: Mixing tank, 4: Liquid extraction pipe, 5: One-way valve, 6: Liquid outlet pipe, 7: First three-way valve, 8: Water inlet, 9: Sealing cap, 10: Air pump, 11: Second three-way valve, 12: First air pipe, 13: Second air pipe, 14: Third air pipe, 15: Anti-slip strip, 16: Positioning buckle, 17: Y-shaped three-way pipe. Detailed Implementation

[0028] It should be noted that, to make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0029] like Figure 1As shown, a foam generating device includes a foam liquid container 1 and a foaming nozzle 2, as well as an air supply component, a mixing tank 3 suitable for water storage, a liquid delivery channel, and an air delivery channel. The foam liquid container 1 is connected to both the liquid delivery channel and the air delivery channel. The foam liquid container 1 is connected in series with the mixing tank 3 and the foaming nozzle 2 through the liquid delivery channel. That is, with the liquid delivery channel connected in series, the foam liquid container 1 is connected to the input end of the mixing tank 3, and then the output end of the mixing tank 3 is connected to the input end of the foaming nozzle 2. Therefore, the foam liquid container 1, the mixing tank 3, and the foaming nozzle 2 can be connected in series in the liquid delivery channel. In addition, the air supply component is connected to the foam liquid container 1 and the foaming nozzle 2 through the air delivery channel. That is, the air supply component outputs air in two ways through the air delivery channel, one way of air is input into the foam liquid container 1, and the other way of air is delivered to the foaming nozzle 2.

[0030] This embodiment provides a foam generating device, including an air supply component, a mixing tank 3, a liquid delivery channel, and an air delivery channel. Since the foam liquid container 1 is connected in series with the mixing tank 3 and the foaming nozzle 2 via the liquid delivery channel, the foam liquid stored in the foam liquid container 1 can first enter the mixing tank 3 through the liquid delivery channel and mix with the water in the mixing tank 3 to form a mixture. Then, the mixture continues to flow along the liquid delivery channel to the foaming nozzle 2. Simultaneously, since the air supply component is connected to both the foam liquid container 1 and the foaming nozzle 2 via the air delivery channel, air can be output in two separate paths. Therefore, on the one hand, the air supply component can input air pressure into the foam liquid container 1 through the air delivery channel, pressurizing the inside of the foam liquid container 1 and using the high air pressure to promote the foaming process within the foam liquid container 1. The foam liquid automatically enters the infusion channel and flows to the mixing tank 3 and the foaming nozzle 2. Meanwhile, the air supply component delivers air to the foaming nozzle 2 through the air supply channel to aerate the mixture, achieving a thorough mixing of the foam liquid, water, and air. Finally, foam is sprayed out from the foaming nozzle 2. The entire foam generation process uses only one air supply component, which uses air pressure to extract the foam liquid from the foam liquid container 1 and mix it with water. Therefore, there is no need for a liquid pump, completely eliminating the problem of liquid pump failure and effectively reducing the equipment failure rate. Furthermore, the structure is simple, the manufacturing cost is low, and there is no need to pre-mix and dilute the foam liquid and water, saving tedious pretreatment steps and making it more convenient to use. Therefore, the foam generating device of this invention can effectively reduce the equipment failure rate, has a simple structure, low manufacturing cost, and eliminates the tedious steps of pre-mixing and diluting water and liquid, making it more convenient to use.

[0031] As an optional further supplement or improvement to this embodiment, the air supply component is an air pump 10. The air pump 10 can be an electric air pump or a manual air pump. The selection of both types of air pumps is within the protection scope of this invention. When in use, the air pump 10 is started to output air to the air delivery channel, which is not only simple in structure but also convenient to operate.

[0032] Furthermore, the air supply component can also be configured as a jet device or jet mechanism, and such simple variations are all within the scope of protection of this invention.

[0033] As an optional further supplement or improvement to this embodiment, the mixing tank 3 is provided with a water inlet 8 for connecting to an external water source. In use, the water inlet 8 can be used to connect to an external water pipe, allowing external water to enter the mixing tank 3 and mix with the foam liquid. This also facilitates real-time replenishment of water to the mixing tank 3, making it convenient to use. Alternatively, the mixing tank 3 may be a water storage tank, without the water inlet 8 for connecting to an external water source, but only equipped with a flip-top. Water is injected into the mixing tank 3 by opening the flip-top, allowing the mixing tank 3 to pre-store a sufficient amount of water for subsequent mixing with the foam liquid from the foam liquid container 1.

[0034] As an optional further supplement or improvement to this embodiment, the infusion channel includes a suction tube 4, one end of which is connected to the mixing tank 3, and the other end is connected to the foam liquid container 1 and extends to the bottom of the foam liquid container 1 (e.g., Figure 2 (As shown). The foam liquid container 1 and the mixing tank 3 can be connected by the extraction pipe 4 to transfer the foam liquid in the foam liquid container 1 into the mixing tank 3. At the same time, since the other end of the extraction pipe 4 extends to the bottom of the foam liquid container 1, it helps to extract all the foam liquid in the foam liquid container 1, which is convenient to use.

[0035] As an optional further supplement or improvement to this embodiment, the extraction pipe 4 is connected to a one-way valve 5, and the output end of the one-way valve 5 is connected to the mixing tank 3 through the extraction pipe 4. Under the guiding action of the one-way valve 5, it helps the foam liquid to flow in one direction, ensuring that the foam liquid can only be transported from the foam liquid container 1 to the mixing tank 3, and can effectively prevent the mixed liquid in the mixing tank 3 from flowing back into the foam liquid container 1, affecting normal operation. That is, the one-way valve 5 can prevent the water in the mixing tank 3 from flowing back into the foam liquid container 1 after foaming is completed.

[0036] As an optional further supplement or improvement to this embodiment, the infusion channel also includes an outlet pipe 6, one end of which is connected to the mixing tank 3 and the other end is connected to the foaming nozzle 2.

[0037] The mixing tank 3 and the foaming nozzle 2 can be connected through the liquid outlet pipe 6 so that the mixed liquid in the mixing tank 3 can flow into the foaming nozzle 2.

[0038] As an optional further supplement or improvement to this embodiment, the air supply channel is provided with a first three-way valve 7, and the air supply component is connected to the foam liquid container 1 and the outlet pipe 6 respectively through the first three-way valve 7. Under the action of the first three-way valve 7, the air supply channel can be divided into multiple pipelines, so that the air output from the air pump 10 can be divided into two paths, which are respectively delivered to the foam liquid container 1 and the foaming nozzle 2 in different directions. This allows the air output from the air pump 10 to not only input air pressure into the foam liquid container 1 through the air supply channel, pressurizing the inside of the foam liquid container 1, and using the high air pressure to cause the foam liquid in the foam liquid container 1 to automatically enter the supply channel and flow to the mixing tank 3 and the foaming nozzle 2, but also to deliver air to the foaming nozzle 2 through the air supply channel to aerate the mixture, realizing the mixing of foam liquid, water and air. Finally, foam can be sprayed out from the foaming nozzle 2, realizing that the entire foam generation process can use only one air supply component, making the structure more simplified.

[0039] As an optional further supplement or improvement to this embodiment, a filter screen is provided inside the foaming nozzle 2. After the mixture and air pass through the filter screen inside the foaming nozzle 2, foam can be formed and output outward.

[0040] As an optional further supplement or improvement to this embodiment, the opening of the foam liquid container 1 is provided with a sealing cap 9, and the liquid delivery channel and the gas delivery channel are respectively connected to the interior of the foam liquid container 1 through the sealing cap 9.

[0041] As an optional further supplement or improvement to this embodiment, a plurality of anti-slip strips 15 are formed on the surface of the sealing cover 9. The extension direction of each anti-slip strip 15 is perpendicular to the rotation direction of the sealing cover 9. Each anti-slip strip 15 is axially wrapped around the outer wall of the sealing cover 9. The friction between the hand and the sealing cover 9 can be increased by each anti-slip strip 15, thereby reducing the difficulty of disassembling the sealing cover 9 and avoiding the difficulty of removing the sealing cover 9 by rotation due to the foam liquid adhering to the surface of the sealing cover 9.

[0042] As an optional further supplement or improvement to this embodiment, positioning buckles 16 are respectively provided on opposite sides of the outer wall of the foaming nozzle 2. The positioning buckles 16 on both sides are symmetrical to each other, so as to facilitate the stable installation of the foaming nozzle 2 in the equipment.

[0043] As an optional further supplement or improvement to this embodiment, a second three-way valve 11 is also included. Both ends of the second three-way valve 11 are connected to the liquid outlet pipe 6, and the remaining end of the second three-way valve 11 is connected to the gas delivery channel, so that the gas delivery channel and the liquid outlet pipe 6 intersect and connect with each other.

[0044] Specifically, the gas delivery channel includes a first air pipe 12, a second air pipe 13, and a third air pipe 14. One end of the first air pipe 12 is connected to the air outlet of the air pump 10, and the other end is connected to the first three-way valve 7. One end of the second air pipe 13 is connected to the foam liquid container 1, and the other end is connected to the first three-way valve 7. One end of the third air pipe 14 is connected to the first three-way valve 7, and the other end is connected to the second three-way valve 11. The two ports of the second three-way valve 11 are connected to the liquid outlet pipe 6, so that the gas delivery channel and the liquid outlet pipe 6 can be interconnected. The air output by the air pump 10 can first enter the first air pipe 12, then enter the first three-way valve 7, then enter the third air pipe 14 through the first three-way valve 7, and finally enter the liquid outlet pipe 6 through the second three-way valve 11 to aerate the mixture in the liquid outlet pipe 6, so as to achieve the mixing of foam liquid, water, and air.

[0045] Specifically, the outlet pipe 6 is divided into two sections, and the two opposite ports of the second three-way valve 11 are respectively connected to the two outlet pipe sections 6. The middle port of the second three-way valve 11 is connected to the third air pipe 14. The technical effect achieved by this structure is that after the air from the air pump 10 enters the middle port of the second three-way valve 11 through the third air pipe 14, it can pressurize the outlet pipe 6, causing the air and the originally unidirectionally flowing mixture in the outlet pipe 6 to collide violently with each other. This allows the air and the mixture to mix more thoroughly, fully realizing the convergence and mixing of foam liquid, water and air. Ultimately, this results in more uniform sprayed foam and further improves the foaming effect.

[0046] As an optional further supplement or improvement to this embodiment, such as Figure 3 As shown, the mixing tank 3 is equipped with a Y-shaped tee pipe 17. The first end a of the Y-shaped tee pipe 17 is connected to the interior of the mixing tank 3, and the water inlet 8 is the first end b of the Y-shaped tee pipe 17. The third end c of the Y-shaped tee pipe 17 is connected to the extraction pipe 4. Through the above-mentioned structure of the Y-shaped tee pipe, the foam liquid in the extraction pipe 4 and the external water source can converge at a certain angle from the first end b and the third end c of the Y-shaped tee pipe and enter the mixing tank 3 together. This makes the convergence of the foam liquid and the water body smoother and allows them to enter the mixing tank 3 together smoothly. This avoids the water pressure from the external water source and the air pressure from the extraction pipe 4 from entering the mixing tank 3 separately, which would weaken the normal output pressure of the mixture in the mixing tank 3 and help ensure a good foam spraying effect.

[0047] As an optional further supplement or improvement to this embodiment, such as Figure 4 As shown, the inlet 8 and the suction pipe 4 are tangentially connected to the inside of the mixing tank 3 from opposite directions. This structure allows the foam liquid and water to form a rotating flow inside the mixing tank 3, which helps to make the foam liquid and water mix more evenly.

[0048] Based on the above, this embodiment also provides a foam generation method, which is based on a foam generation device of this embodiment. The specific steps are as follows: the air generated by the air pump 10 (i.e., the air supply component) is delivered to the foam liquid container 1 and the outlet pipe 6 through the air supply channel. The air entering the foam liquid container 1 from the air pump 10 pressurizes the inside of the foam liquid container 1, so as to drive the foam liquid in the foam liquid container 1 into the extraction pipe 4 and the mixing tank 3 in sequence. The foam liquid entering the mixing tank 3 mixes with water and fills the inside of the mixing tank 3. Then it is output from the upper outlet of the mixing tank 3 and delivered to the outlet pipe 6 and the foaming nozzle 2 in sequence. The air entering the outlet pipe 6 from the air pump 10 mixes with the foam liquid and water in the outlet pipe 6 and then enters the foaming nozzle 2 together. Foam is output to the outside through the foaming nozzle 2.

[0049] In this embodiment of a foam generation method, during operation, the air generated by the air pump 10 can be split into two outputs. On one hand, the air pump 10 can input air pressure into the foam liquid container 1 through the air delivery channel, pressurizing the inside of the foam liquid container 1. The high air pressure causes the foam liquid in the foam liquid container 1 to automatically enter the delivery channel and flow to the mixing tank 3 and the foaming nozzle 2. On the other hand, the air pump 10 can also deliver air to the foaming nozzle 2 through the air delivery channel to aerate the mixture, achieving the mixing of foam liquid, water, and air. Finally, foam can be sprayed out from the foaming nozzle 2. The entire foam generation process can be completed using only one air supply component, which extracts the foam liquid from the foam liquid container 1 using air pressure and then mixes it with water. Therefore, there is no need to use a liquid pump, completely eliminating the problem of liquid pump failure, effectively reducing the equipment failure rate. Furthermore, the structure is simple, the manufacturing cost is low, and there is no need to pre-mix and dilute the foam liquid and water, saving cumbersome pretreatment steps and making it more convenient to use. Therefore, the foam generation method of the present invention can effectively reduce the failure rate of equipment, help simplify the equipment structure and reduce the manufacturing cost of equipment, and eliminate the tedious steps of pre-mixing and diluting water and liquid, making it more convenient to use.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A foam generating device, comprising a foam liquid container (1) and a foaming nozzle (2), characterized in that, It also includes an air supply component, a mixing tank (3) suitable for water storage, an infusion channel and an air supply channel. The foam liquid container (1) is connected in series with the mixing tank (3) and the foaming nozzle (2) through the infusion channel. The air supply component is connected to the foam liquid container (1) and the foaming nozzle (2) through the air supply channel. The infusion channel also includes an outlet pipe (6), one end of which is connected to the mixing tank (3) and the other end is connected to the foaming nozzle (2); The gas supply channel is equipped with a first three-way valve (7), and the gas supply component is connected to the foam liquid container (1) and the liquid outlet pipe (6) respectively through the first three-way valve (7); It also includes a second three-way valve (11), with both ends of the second three-way valve (11) connected to the liquid outlet pipe (6), and the other end of the second three-way valve (11) connected to the gas transmission channel, so that the gas transmission channel and the liquid outlet pipe (6) intersect and connect with each other.

2. The foam generating device according to claim 1, characterized in that, The infusion channel includes a suction tube (4), one end of which is connected to the mixing tank (3), and the other end is connected to the foam liquid container (1) and extends to the bottom of the foam liquid container (1).

3. A foam generating device according to claim 2, characterized in that, The liquid extraction pipe (4) is connected to a one-way valve (5), and the output end of the one-way valve (5) is connected to the mixing tank (3) through the liquid extraction pipe (4).

4. A foam generating device according to claim 1, characterized in that, The foaming nozzle (2) is equipped with a filter screen inside.

5. A foam generating device according to claim 1, characterized in that, The mixing tank (3) is provided with an inlet (8) for connecting to an external water source.

6. A foam generating device according to claim 5, characterized in that, The opening of the foam liquid container (1) is provided with a sealing cap (9), and the liquid delivery channel and the gas delivery channel are respectively connected to the interior of the foam liquid container (1) through the sealing cap (9).

7. A foam generation method based on the foam generating apparatus according to any one of claims 1 to 6, characterized in that, The air generated by the air supply component is delivered to the foam liquid container (1) and the outlet pipe (6) through the air supply channel. The air entering the foam liquid container (1) from the air supply component pressurizes the inside of the foam liquid container (1) to drive the foam liquid in the foam liquid container (1) into the extraction pipe (4) and the mixing box (3) in sequence. The foam liquid entering the mixing box (3) mixes with water and fills the inside of the mixing box (3). Then it is output from the upper outlet of the mixing box (3) and delivered to the outlet pipe (6) and the foaming nozzle (2) in sequence. The air entering the outlet pipe (6) from the air supply component mixes with the foam liquid and water in the outlet pipe (6) and then enters the foaming nozzle (2) together. Foam is output to the outside through the foaming nozzle (2).

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