Gas mixing venturi tube and bubble water device

Abstract

The invention discloses a gas mixing venturi tube and a bubble water device, and relates to the technical field of life electric appliances, the gas mixing venturi tube comprises a tube body, the tube body is provided with a main body part, and an inlet section, a gas suction section and an outlet section which are connected with the main body part; the main body part is provided with a contraction section, a throat pipe section and an expansion section, the inlet section is connected with the contraction section, and two ends of the expansion section are respectively connected with the throat pipe section and the outlet section; the main body part is further provided with an air cavity; the air suction section is communicated with the throat pipe section through the air cavity; the diameter of the throat pipe section is D1, the length of the throat pipe section is L1, D1 is larger than or equal to 1 mm and smaller than or equal to 3 mm, and L1 is larger than or equal to 9 mm and smaller than or equal to 15 mm. According to the gas mixing venturi tube, the concentration and quality of bubble water can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to a gas-mixing Venturi tube and a sparkling water device. Background Art

[0002] The sparkling water device mainly realizes the preparation of sparkling water through the carbonation system components. Among them, the taste, concentration, and stability of the sparkling water depend on the structure and process parameters of the carbonation system. At present, the household sparkling water devices on the market generally adopt the carbonation tank structure components. However, for this kind of sparkling water device, the gas-liquid mixing mainly relies on mechanical stirring or high-pressure direct injection, resulting in low gas-liquid mass transfer efficiency; the structure is complex, leading to high manufacturing costs, large volume, and high energy consumption; moreover, the concentration after gas-liquid mixing is significantly affected by factors such as pressure and time, with a low concentration and insufficient stability. Summary of the Invention

[0003] The main object of the present invention is to propose a gas-mixing Venturi tube and a sparkling water device, aiming to solve at least one of the technical problems raised in the above background art.

[0004] To achieve the above object, the gas-mixing Venturi tube proposed by the present invention includes a tube body having a main body portion, as well as an inlet section, a suction section, and an outlet section connected to the main body portion; the main body portion is provided with a contraction section, a throat section, and an expansion section, the inlet section is connected to the contraction section, and both ends of the expansion section are respectively connected to the throat section and the outlet section;

[0005] The main body portion is further provided with a gas cavity, and the suction section is communicated with the throat section through the gas cavity; wherein, the diameter of the throat section is D1, and the length is L1, satisfying 1 mm ≤ D1 ≤ 3 mm, and 9 mm ≤ L1 ≤ 15 mm.

[0006] In one embodiment, the inner diameter of the inlet section is D2, satisfying 5.5 mm ≤ D2 ≤ 7 mm; and / or,

[0007] The length of the inlet section is L2, satisfying 12 mm ≤ L2 ≤ 18 mm.

[0008] In one embodiment, the inner diameter of the outlet section is D3, satisfying 5.8 mm ≤ D3 ≤ 7 mm; and / or,

[0009] The length of the outlet section is L3, satisfying 180 mm ≤ L3 ≤ 220 mm.

[0010] In one embodiment, the inner diameter of the suction section is D4, satisfying 1.5 mm ≤ D4 ≤ 4 mm; and / or,

[0011] The length of the suction section is L4, satisfying 13 mm ≤ L4 ≤ 20 mm.

[0012] In one embodiment, the contraction section is tapered from one end of the inlet section in a direction away from the inlet section, and the length of the contraction section is L5, satisfying 8 mm ≤ L5 ≤ 12 mm, and / or,

[0013] The expansion section is tapered from one end of the throat section towards one end of the outlet section, and the length of the expansion section is L6, satisfying 13 mm ≤ L6 ≤ 20 mm.

[0014] In one embodiment, the inner wall surface of the contraction section and the axis of the contraction section have an included angle A, satisfying 12° ≤ A ≤ 15°, and / or,

[0015] The inner wall surface of the expansion section and the axis of the expansion section have an included angle B, satisfying 6° ≤ B ≤ 10°.

[0016] In one embodiment, the inlet section, the contraction section, the throat section, the expansion section and the outlet section are coaxially arranged.

[0017] In one embodiment, a nozzle section is further provided at the end of the contraction section close to the throat section. The nozzle section is arranged corresponding to the throat section, and the diameter of the nozzle section is smaller than the diameter of the throat section.

[0018] In one embodiment, at least a part of the nozzle section extends into the throat section.

[0019] In one embodiment, a throat guiding surface is provided at the end of the throat section close to the nozzle section. The throat guiding surface extends obliquely away from the throat section in the direction from the throat section to the nozzle section.

[0020] In one embodiment, the diameter of the nozzle section is D7, satisfying 1.2 mm ≤ D7 ≤ 1.8 mm; and / or,

[0021] The length of the nozzle section is L7, satisfying 0.6 mm ≤ L7 ≤ 1.5 mm.

[0022] In one embodiment, the axis of the suction section is perpendicular to the axis of the inlet section.

[0023] In one embodiment, the inlet section and the contraction section form a water inlet channel, the suction section forms an air inlet channel, the throat section, the expansion section and the outlet section form a mixing channel. The water inlet channel is communicated with the mixing channel, the air inlet channel is communicated with the mixing channel through the air cavity, and the mixing channel is used for mixing gas and liquid.

[0024] The present invention also provides a sparkling water device, which includes the gas mixing Venturi tube. The gas mixing Venturi tube includes a tube body having a main body portion, and an inlet section, a suction section, and an outlet section connected to the main body portion; the main body portion is provided with a contraction section, a throat section, and a diffusion section, the inlet section is connected to the contraction section, and both ends of the diffusion section are respectively connected to the throat section and the outlet section;

[0025] The main body portion is further provided with a gas cavity, and the suction section is communicated with the throat section through the gas cavity; wherein, the diameter of the throat section is D1 and the length is L1, satisfying 1mm ≤ D1 ≤ 3mm and 9mm ≤ L1 ≤ 15mm.

[0026] According to the technical solution of the present invention, by designing the diameter and length parameters of the throat section, the diameter is limited between 1mm and 3mm, and the length is limited between 9mm and 15mm. A suitable flow channel space is provided for gas-liquid mixing, so that high-speed water flow and CO2 gas can be fully mixed and reacted in the throat section. The appropriate diameter and length not only ensure the water flow velocity and the formation of negative pressure, but also provide sufficient time and space for gas inhalation and mixing, improve the gas-liquid mass transfer efficiency, promote the formation and refinement of bubbles, and thus enhance the concentration and quality of sparkling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of an embodiment of the gas mixing Venturi tube provided by the present invention;

[0029] Figure 2 For Figure 1 the dimensional marking diagram of the gas mixing Venturi tube in

[0030] Figure 3 For Figure 1 the angular marking diagram of the gas mixing Venturi tube in

[0031] Figure 4 For Figure 3 the partial enlarged view at M in

[0032] Figure 5 It is a schematic structural diagram of an embodiment of the sparkling water device provided by the present invention.

[0033] Explanation of the reference numerals in the drawings:

[0034] 1. Sparkling water device; 20. Housing; 20a. Water outlet; 30. Water storage tank; 40. CO2 gas cylinder; 50. Filter module;

[0035] 10. Mixing venturi tube; 100. Tube body; 110. Main body part; 111. Converging section; 112. Throat section; 112a. Throat guiding surface; 113. Diverging section; 114. Air cavity; 115. Nozzle section; 120. Inlet section; 130. Suction section; 140. Outlet section.

[0036] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0038] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] The sparkling water device mainly realizes the preparation of sparkling water through the carbonation system components. Among them, the taste, concentration and stability of the sparkling water depend on the structure and process parameters of the carbonation system.

[0041] At present, household sparkling water devices on the Chinese market are mainly divided into the following three categories: (1) High-pressure gas cylinder direct injection type: A high-pressure CO2 gas cylinder is used to directly inject gas into the water tank, and the gas flow is controlled by a manual or electric valve. It is simple to operate and small in size. However, there are problems such as short gas-water contact time, low mixing efficiency, uneven bubbles, and unstable carbonation concentration due to gas cylinder pressure fluctuations. (2) Carbonation tank type: Gas is automatically replenished into the carbonation tank, and water enters the carbonation tank in a spray form. The atomization effect of the water spray nozzle directly affects the gas-liquid mixing effect and the concentration of sparkling water. This carbonation system has complex mechanical structures, high failure rates, high maintenance costs, high stirring energy consumption, significant noise, limited gas-liquid contact area, and still unsatisfactory mass transfer efficiency. (3) Pre-inflated disposable capsule machine structure: Pre-filled CO2 capsules or cartridges are used, and gas is released into the water tank through a puncturing device. It has strong portability and does not require an external gas source. However, there are problems such as high capsule costs, the need to discard them after single use, uncontrollable gas release speed, poor mixing uniformity, poor environmental protection, and the generation of a large amount of plastic waste.

[0042] At present, carbonation tank structural components are commonly used in household sparkling water devices on the market. However, for such sparkling water devices, gas-liquid mixing mainly relies on mechanical stirring or high-pressure direct injection, resulting in low gas-liquid mass transfer efficiency; complex structures lead to high manufacturing costs, large volumes, and high energy consumption; moreover, the concentration after gas-liquid mixing is significantly affected by factors such as pressure and time, with low concentration and insufficient stability.

[0043] The present invention provides a gas mixing Venturi tube for a sparkling water device. The sparkling water device can be one of an under-counter water purifier, a tabletop water dispenser, a floor-standing water purifier, a water dispenser, or other types of drinking water equipment.

[0044] Please refer to Figure 1 and Figure 2 In an embodiment of the present invention, the gas mixing Venturi tube 10 includes a tube body 100 having a main body portion 110, as well as an inlet section 120, a suction section 130, and an outlet section 140 connected to the main body portion 110; the main body portion 110 is provided with a contraction section 111, a throat section 112, and a diffusion section 113, the inlet section 120 is connected to the contraction section 111, and both ends of the diffusion section 113 are respectively connected to the throat section 112 and the outlet section 140;

[0045] The main body portion 110 is further provided with a gas chamber 114, and the suction section 130 is communicated with the throat section 112 through the gas chamber 114; wherein, the diameter of the throat section 112 is D1 and the length is L1, satisfying 1 mm ≤ D1 ≤ 3 mm and 9 mm ≤ L1 ≤ 15 mm.

[0046] Specifically, the gas - mixing Venturi tube 10 can be injection - molded from food - grade POM plastic, having good wear resistance and corrosion resistance. The gas - mixing Venturi tube 10 is used to mix gas and liquid. The CO2 gas will flow into the gas - mixing Venturi tube 10 through the suction section 130, and water will flow into the gas - mixing Venturi tube 10 through the water inlet end. Under the action of the gas - mixing Venturi tube 10, using the Venturi effect (the pressure difference caused by the change in fluid flow velocity), the CO2 gas is inhaled into the water and mixed and dissolved, and finally the bubble water flows through the outlet section 140 of the gas - mixing Venturi tube 10 to the water outlet 20a for the user to drink the bubble water.

[0047] The tube body 100 is integrally cylindrical, composed of an inlet section 120, a main body section 110, a suction section 130, and an outlet section 140, and can be injection - molded integrally from food - grade POM plastic. Of course, in other embodiments, the various components of the tube body 100 can be separately arranged for easy production and processing.

[0048] The main body section 110 includes a contraction section 111, a throat section 112, and a diffusion section 113. The contraction section 111 is located between the inlet section 120 and the throat section 112 and is arranged in a frustum - of - cone shape. The diffusion section 113 is located between the throat section 112 and the outlet section 140 and is also arranged in a frustum - of - cone shape. It should be noted that the contraction section 111, the throat section 112, and the diffusion section 113 all refer to the wall surfaces of the regions formed within the main body section 110 through which water or CO2 gas can flow. The inlet section 120, the suction section 130, and the outlet section 140 refer to the hollow tubular structures connected to the main body section 110, which have inner wall surfaces and outer wall surfaces, and correspondingly have inner diameters and outer diameters.

[0049] One end of the inlet section 120 is connected to the large end of the contraction section 111. The small end of the contraction section 111 is correspondingly arranged at one end of the throat section 112. The other end of the throat section 112 is connected to the small end of the diffusion section 113. The large end of the diffusion section 113 is connected to the outlet section 140. The suction section 130 is communicated with the throat section 112 through the air cavity 114. The air cavity 114 is formed in the main body section 110 of the tube body 100, located on the outer periphery of the contraction section 111 and on one side of the throat section 112.

[0050] This structural design enables the water flow to gradually increase in velocity and decrease in pressure when passing through the inlet section 120 and entering the contraction section 111, creating a negative pressure in the throat section 112. The CO2 gas is inhaled through the air cavity 114 and mixed with the high-speed water flow. The reasonable design of the contraction section 111, the throat section 112, and the expansion section 113, as well as the surrounding arrangement of the air cavity 114, ensure the sufficiency and stability of the gas-liquid mixing, improve the preparation efficiency and quality of the bubble water, and result in good gas-liquid mixing and a significant increase in the bubble concentration. Among them, the air cavity 114 is arranged around the outer periphery of the contraction section 111. The air cavity 114 is generally arranged as an annular cavity, which can be a regular annular cavity or an irregular cavity, and no specific limitation is made in this regard.

[0051] Furthermore, the annular cavity surrounding the outer parts of the contraction section 111 and the inlet section of the throat section 112 is the air cavity 114. The internal space of the air cavity 114 is connected to the intake pipe. The CO2 gas flows from the CO2 gas cylinder 40 through the pressure reducing valve into the intake section of the mixing Venturi tube 10. The pressure of the pressure reducing valve of the CO2 gas cylinder 40 is generally 0.4 Mpa. Under the pressure, the CO2 gas flows into the mixing Venturi tube 10 at high speed and diffuses evenly in the air cavity 114. An annular intake channel is formed between the outer peripheral wall of the contraction section 111 and the throat section 112. The CO2 gas enters the throat section 112 from the annular channel, instantly forming an air ring that flows deep into the throat section 112. Inside the air ring is the water flow ejected from the outlet of the contraction section 111 into the throat section 112. The CO2 gas meets the water at the outlet of the contraction section 111. Compared with water, the CO2 gas has a higher flow velocity and a lower pressure. In the throat section 112, the water flow moves towards the gas annular space with a smaller pressure, cutting the gas into larger bubbles. The large bubbles and water flow together towards the expansion section 113. The diameter of the expansion section 113 gradually increases, the fluid flow velocity gradually decreases, and the pressure further increases. The water squeezes the bubbles to become smaller, and some of the bubbles burst into more and smaller bubbles to balance the water pressure. In the expansion section 113, the mixed fluid generates eddies with a large turbulence intensity, and some of the large bubbles are sheared into small bubbles by the eddies. The decrease in the size of the bubbles increases the specific surface area of gas-liquid mass transfer. During the process of the water flow cutting the bubbles, the film on the surface of the bubbles is simultaneously thinned. The film on the surface of the bubbles is the contact surface for gas-liquid mass transfer. The thinner the film, the smaller the gas-liquid mass transfer resistance, further improving the gas-liquid mass transfer efficiency. The CO2 and water are further mixed in the outlet section 140 of the mixing Venturi tube 10 to achieve efficient gas-liquid mass transfer.

[0052] Overall, the structure of the contraction section 111 - throat section 112 - expansion section 113 of the main body 110 forms a multi-stage flow field of speed increase - pressure reduction - pressure increase, which increases the liquid flow velocity to 20 - 30 m / s in the throat section 112, with an atomization particle size ≤ 500 μm, and the gas-liquid contact area is 3 - 5 times that of a conventional Venturi tube. Experimental data shows that the carbonation concentration is increased by 25% - 40% compared with the traditional structure under the same gas flow rate. The annular gas cavity 114 surrounding the contraction section 111 serves as a gas storage area, balancing the instantaneous CO2 flow rate fluctuation of ±10%, avoiding the blockage of the flow channel by "gas masses", and improving the stability of the mixing concentration by 60%. The measured carbonation concentration can reach 4.0 V / V (the industry average is 2.5 V / V).

[0053] The value of the diameter D1 of the throat section 112 can be exemplarily 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm. In this embodiment, D1 = 2 mm, satisfying 1 mm ≤ D1 ≤ 3 mm; the value of the length L1 of the throat section 112 can be exemplarily 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm. In this embodiment, the length L1 = 10 mm, satisfying 9 mm ≤ L1 ≤ 15 mm.

[0054] The design of the diameter and length parameters of the throat section 112 provides a suitable flow channel space for gas-liquid mixing, enabling high-speed water flow and CO2 gas to be fully mixed and reacted within the throat section 112. The appropriate diameter and length not only ensure the water flow velocity and the formation of negative pressure but also provide sufficient time and space for gas inhalation and mixing, improving the gas-liquid mass transfer efficiency, promoting the formation and refinement of bubbles, and thus enhancing the concentration and quality of the bubble water.

[0055] Please refer to Figure 1 and Figure 2 , in an embodiment, the inner diameter of the inlet section 120 is D2, satisfying 5.5 mm ≤ D2 ≤ 7 mm; and / or,

[0056] the length of the inlet section 120 is L2, satisfying 12 mm ≤ L2 ≤ 18 mm.

[0057] Specifically, the inlet section 120 is cylindrical with a smooth inner wall and is connected to the water outlet end of the water storage tank 30 through a silicone hose. One end of the inlet section 120 is connected to the water outlet end of the water storage tank 30, and the other end is connected to the large end of the contraction section 111, with the axis being consistent with the axis of the contraction section 111 to ensure that the water flow can smoothly enter the contraction section 111. The inner diameter D2 of the inlet section 120 can be exemplarily 5.5 mm, 6 mm, 6.5 mm, or 7 mm. In this embodiment, D2 = 6 mm, satisfying 5.5 mm ≤ D2 ≤ 7 mm. The length L2 of the inlet section 120 can be exemplarily 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, or 18 mm. In this embodiment, the length L2 of the inlet section 120 = 15 mm, satisfying 12 mm ≤ L2 ≤ 18 mm.

[0058] The design of the inner diameter and length of the inlet section 120 ensures a stable inflow of water, providing a basis for the subsequent acceleration of the contraction section 111. The appropriate inner diameter and length avoid problems such as turbulence or excessive pressure loss of the water flow in the inlet section 120, ensuring the stability of the flow field within the entire mixing Venturi tube 10 and improving the reliability of the bubble water preparation process.

[0059] Please refer to Figure 1 and Figure 2 , in one embodiment, the inner diameter of the outlet section 140 is D3, satisfying 5.8 mm ≤ D3 ≤ 7 mm; and / or,

[0060] the length of the outlet section 140 is L3, satisfying 180 mm ≤ L3 ≤ 220 mm.

[0061] Specifically, the outlet section 140 is cylindrical with a smooth inner wall and is connected to the water outlet 20a of the housing 20 through a silicone hose. One end of the outlet section 140 is connected to the large end of the expansion section 113, and the other end is connected to the water outlet 20a of the housing 20, with the axis being consistent with the axis of the expansion section 113 to ensure that the mixed gas-liquid fluid can smoothly flow out. The inner diameter D3 of the outlet section 140 can be exemplarily 5.8 mm, 5.9 mm, 6 mm, 6.1 mm, 6.2 mm, 6.3 mm, 6.4 mm, 6.5 mm, 6.6 mm, 6.7 mm, 6.8 mm, 6.9 mm, or 7 mm. In this embodiment, D3 = 6 mm, satisfying 5.8 mm ≤ D3 ≤ 7 mm. The length L3 of the outlet section 140 can be exemplarily 180 mm, 185 mm, 190 mm, 195 mm, 200 mm, 205 mm, 210 mm, 215 mm, or 220 mm. In this embodiment, L3 = 200 mm, satisfying 180 mm ≤ L3 ≤ 220 mm.

[0062] The inner diameter and length of the outlet section 140 are designed to provide sufficient flow space and time for the gas-liquid mixed fluid, enabling the bubbles to be further stabilized and evenly distributed within the outlet section 140. The appropriate inner diameter and length avoid problems such as excessive pressure fluctuations and flow resistance of the fluid within the outlet section 140, ensuring the stable outflow of the bubble water and enhancing the user experience.

[0063] Please refer to Figure 1 and Figure 2 , in one embodiment, the inner diameter of the suction section 130 is D4, satisfying 1.5 mm ≤ D4 ≤ 4 mm; and / or,

[0064] the length of the suction section 130 is L4, satisfying 13 mm ≤ L4 ≤ 20 mm.

[0065] Specifically, the suction section 130 is cylindrical and can be connected to the gas outlet end of the CO2 gas cylinder 40 through a stainless steel gas pipe. One end of the suction section 130 is connected to the gas outlet end of the CO2 gas cylinder 40, and the other end is communicated with the gas chamber 114. The axis is perpendicular to the circumferential wall of the gas chamber 114, ensuring that the gas can enter the gas chamber 114 vertically and be evenly distributed.

[0066] Exemplary values of the inner diameter D4 of the suction section 130 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm. In this embodiment, D4 = 2 mm, satisfying 1.5 mm ≤ D4 ≤ 2.5 mm. Exemplary values of the length L4 of the suction section 130 can be 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm. In this embodiment, L4 = 15 mm, satisfying 13 mm ≤ L4 ≤ 17 mm.

[0067] The design of the inner diameter and length of the suction section 130 ensures the stable inflow of CO2 gas, providing appropriate gas flow rate and pressure for the gas chamber 114. The appropriate inner diameter and length avoid pressure loss and flow rate fluctuations during gas flow, ensuring the stability and efficiency of the gas-liquid mixing process and improving the preparation quality of the bubble water.

[0068] Please refer to Figure 1 and Figure 2 , in one embodiment, the contraction section 111 is tapered from one end of the inlet section 120 towards the direction away from the inlet section 120, and the length of the contraction section 111 is L5, satisfying 8 mm ≤ L5 ≤ 12 mm, and / or,

[0069] the expansion section 113 is tapered from one end of the throat section 112 towards one end of the outlet section 140, and the length of the expansion section 113 is L6, satisfying 13 mm ≤ L6 ≤ 20 mm.

[0070] Specifically, the contraction section 111 is tapered from one end of the inlet section 120 in a direction away from the inlet section 120. The value of the length L5 can be exemplarily 8 mm, 9 mm, 10 mm, 11 mm, 12 mm. In this embodiment, L5 = 10 mm, satisfying 8 mm ≤ L5 ≤ 12 mm. The expansion section 113 is tapered from one end of the throat section 112 towards one end of the outlet section 140. The value of the length L6 can be exemplarily 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm. In this embodiment, L6 = 15 mm, satisfying 13 mm ≤ L6 ≤ 17 mm.

[0071] The large end of the contraction section 111 is connected to the inlet section 120, and the small end is opposite to the nozzle section 115 of the throat section 112; the small end of the expansion section 113 is connected to the throat section 112, and the large end is connected to the outlet section 140. The axes of each section are consistent, forming a smooth transition. The tapered and expanding designs of the contraction section 111 and the expansion section 113 utilize the Venturi effect to accelerate and depressurize the water flow in the contraction section 111 and decelerate and pressurize it in the expansion section 113, forming a good gas-liquid mixing flow field. Appropriate length and angle parameters optimize the flow velocity and pressure changes of the fluid, improve the gas inhalation efficiency and the bubble breakup effect, promote the full mixing of gas and liquid, and enhance the concentration and quality of the bubble water.

[0072] Please refer to Figure 1 and Figure 3 , in an embodiment, the inner wall surface of the contraction section 111 and the axis of the contraction section 111 have an included angle A, satisfying 12° ≤ A ≤ 15°, and / or,

[0073] the inner wall surface of the expansion section 113 and the axis of the expansion section 113 have an included angle B, satisfying 6° ≤ B ≤ 10°.

[0074] Specifically, the inner wall surface of the contraction section 111 and the axis have an included angle A. The angle of the included angle A is exemplarily 12°, 12.5°, 13°, 13.5°, 14°, 14.5°, 15°. In this embodiment, A = 13.5°, within the range of 12° ≤ A ≤ 15°. The inner wall surface of the expansion section 113 and the axis have an included angle B. The angle of the included angle B is exemplarily 6°, 7°, 8°, 9°, 10°, 11°, 12°. In this embodiment, B = 8°, within the range of 6° ≤ B ≤ 10°. The inner wall surfaces of both the contraction section 111 and the expansion section 113 are smooth conical surfaces, with the roughness Ra ≤ 0.4 μm.

[0075] The reasonable settings of the included angle A and the included angle B make the fluid velocity and pressure changes in the contraction section 111 and the expansion section 113 more uniform and stable, reducing the flow resistance and energy loss. The included angle A of the contraction section 111 promotes the acceleration of the water flow and the formation of negative pressure, and the included angle B of the expansion section 113 helps the recovery of the fluid pressure and the breakup of bubbles. The two work together to optimize the flow field of the gas-liquid mixture, improve the gas-liquid mass transfer efficiency, and thus enhance the preparation quality of the bubble water.

[0076] Please refer to Figure 1 , in an embodiment, the inlet section 120, the contraction section 111, the throat section 112, the expansion section 113, and the outlet section 140 are coaxially arranged. Specifically, the axis of the inlet section 120, the axis of the contraction section 111, the axis of the throat section 112, the axis of the expansion section 113, and the axis of the outlet section 140 are completely collinear, forming a linear flow channel. The coaxial arrangement enables the liquid to smoothly enter the contraction section 111 in a laminar flow state at the inlet section 120, avoiding the flow separation phenomenon caused by axis offset. The flow velocity in the contraction section 111 increases uniformly along the circumferential direction, and the measured non-uniformity of the flow velocity distribution is <5% (the non-uniformity of the non-coaxial structure is ≥20%).

[0077] Moreover, the throat section 112 is coaxial with the contraction section 111 and the expansion section 113, ensuring that the high-speed jet is ejected along the center of the throat axis. The CO2 gas uniformly converges through the annular gas cavity 114 to form a symmetric gas-liquid shear layer, improving the bubble breakup rate, which is at least 25% higher than that of the non-coaxial structure.

[0078] Please refer to Figure 1 and Figure 4 , in an embodiment, a nozzle section 115 is further provided at the end of the contraction section 111 close to the throat section 112. The nozzle section 115 is arranged corresponding to the throat section 112, and the diameter of the nozzle section 115 is smaller than that of the throat section 112.

[0079] Specifically, a nozzle section 115 is provided at the end of the contraction section 111 close to the throat section 112. The diameter of the nozzle section 115 is smaller than that of the throat section 112. The nozzle section 115 is integrally formed with the contraction section 111. The nozzle section 115 is arranged corresponding to the throat section 112 and is located at the end of the contraction section 111. The setting of the nozzle section 115 enables the water flow to form a high-speed jet when entering the throat section 112, further reducing the pressure in the throat section 112 and enhancing the inhalation capacity of the CO2 gas. At the same time, the diameter of the nozzle section 115 is smaller than that of the throat section 112, forming a cross-section mutation, so that the water flow and the gas generate strong shearing and mixing effects in the throat section 112, improving the gas-liquid mass transfer efficiency and promoting the formation and refinement of bubbles.

[0080] Please refer to Figure 4, in one embodiment, the nozzle section 115 at least partially extends into the throat section 112. Specifically, the nozzle section 115 at least partially extends into the throat section 112. The nozzle section 115 is integrally formed with the converging section 111. There is a certain gap between the part extending into the throat section 112 and the inner wall of the throat section 112 to ensure that the gas can smoothly enter the throat section 112. The design of the nozzle section 115 extending into the throat section 112 enables a stable jet flow of high-speed water to be formed in the throat section 112. At the same time, the annular channel between the nozzle section 115 and the inner wall of the throat section 112 provides a uniform inflow path for the CO2 gas, promoting the full mixing of gas and liquid. An appropriate extension length avoids problems such as uneven gas distribution caused by too shallow extension or increased flow resistance caused by too deep extension, optimizes the flow field of gas-liquid mixing, and improves the preparation efficiency of bubble water.

[0081] Furthermore, the length range of the nozzle section 115 extending into the throat section 112 is between 0 mm and 0.6 mm. Specifically, the exemplary lengths of the nozzle section 115 extending into the throat section 112 are 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, and 0.6 mm. The length of the nozzle section 115 extending into the throat section 112 directly affects the cross-sectional area of the flow channel and the velocity distribution in the throat section 112. When the nozzle section 115 extends too shallowly into the throat section 112, the nozzle section 115 does not fully extend into the throat section 112, and the gas is unevenly distributed after inhalation, easily forming "gas masses" or local high-pressure areas. The uneven concentration of the mixed liquid easily leads to insufficient contact between the high-speed jet and the inner wall surface of the throat section 112, resulting in a reduced range of the negative pressure area and an increased pressure fluctuation. When the nozzle section 115 extends too deeply into the throat section 112, the excessive extension of the nozzle section 115 into the throat section 112 will compress the flow channel. Although it can enhance the local flow velocity, it will cause turbulent separation and energy loss, reducing the stability of the negative pressure area. When the depth of the nozzle section 115 is appropriate, a stable shear layer is formed between the jet and the inner wall surface of the throat section 112, with high bubble breakup efficiency and high mixing uniformity. Therefore, the length of the nozzle section 115 extending into the throat section 112 is limited to between 0 mm and 0.6 mm. In this embodiment, the length of the nozzle section 115 extending into the throat section 112 is 0.1 mm, meeting the range of 0 mm to 0.6 mm. The diameter of the nozzle section 115 is 1.5 mm, and the diameter of the throat section 112 is 2 mm. An annular gap is formed between the outer surface of the extending part and the inner surface of the throat section 112.

[0082] This length design enables the high-speed jet of the nozzle section 115 to form a stable negative pressure region in the throat section 112, effectively sucking in CO2 gas and fully mixing it with the water flow. Precise control of the extension length ensures the uniformity and stability of gas-liquid mixing, avoiding problems such as reduced mixing efficiency or abnormal flow caused by improper length, and further improving the quality of bubble water.

[0083] Please refer to Figure 4, in one embodiment, a throat guiding surface 112a is provided at the end of the throat section 112 close to the nozzle section 115. The throat guiding surface 112a extends obliquely in a direction away from the throat section 112 in the direction from the throat section 112 to the nozzle section 115.

[0084] Specifically, a throat guiding surface 112a is provided at the end of the throat section 112 close to the nozzle section 115. The throat guiding surface 112a is an inclined surface in the shape of a truncated cone, which can be understood as the end of the throat section 112 being chamfered. The throat guiding surface 112a extends obliquely in a direction away from the throat section 112 in the direction from the throat section 112 to the nozzle section 115.

[0085] The chamfer at the end of the throat section 112 has a guiding effect on the inflow of CO2 gas in the air cavity 114 into the throat section 112, reducing the resistance of gas flow and avoiding the formation of eddies or blockages at the inlet of the throat section 112. If the chamfer is smaller, the turbulence degree of the gas flowing into the throat section 112 is stronger, there are more eddies, the turbulent shear force is larger, but the energy dissipation is larger; if the chamfer is larger, the turbulence degree of the gas flowing into the throat section 112 is weaker, there are fewer eddies, the turbulent shear force is smaller, and the energy dissipation is smaller.

[0086] Therefore, a suitable chamfer angle (i.e., the inclination angle of the throat guiding surface 112a) can inhibit gas eddies, enhance the stability of the negative pressure area and increase the turbulent shear force of the gas, significantly affecting the gas-liquid mixing effect of the mixing Venturi tube 10. The design of the inclination angle of the throat guiding surface 112a optimizes the gas flow direction, enabling it to mix more evenly with the high-speed water flow, improving the gas-liquid mass transfer efficiency, promoting the formation and refinement of bubbles, and thus enhancing the concentration and quality of the bubble water.

[0087] Please refer to Figure 4 , in one embodiment, the diameter of the nozzle section 115 is D7, satisfying 1.2 mm ≤ D7 ≤ 1.8 mm; and / or,

[0088] The length of the nozzle section 115 is L7, satisfying 0.6 mm ≤ L7 ≤ 1.5 mm.

[0089] Specifically, the exemplary values of the diameter D7 of the nozzle section 115 can be 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm. In this embodiment, D7 = 1.5 mm, satisfying 1.2 mm ≤ D7 ≤ 1.8 mm. The exemplary values of the length L7 of the nozzle section 115 can be 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm. In this embodiment, L7 = 0.8 mm, satisfying 0.6 mm ≤ L7 ≤ 1.5 mm.

[0090] The diameter and length of the nozzle section 115 are designed such that the water flow can obtain sufficient flow velocity and kinetic energy when passing through the nozzle section 115, forming an effective negative pressure in the throat section 112 to inhale CO2 gas and mix with it. Appropriate diameter and length parameters balance the water flow velocity and pressure, avoiding problems such as insufficient flow velocity caused by too large a diameter or increased flow resistance caused by too small a diameter, optimizing the gas-liquid mixing effect, and improving the preparation quality of the bubble water.

[0091] Please refer to Figure 1 , in one embodiment, the axis of the suction section 130 is perpendicular to the axis of the inlet section 120.

[0092] Specifically, the axis of the suction section 130 and the axis of the inlet section 120 are set to be perpendicular to each other, that is, the directions of the gas and liquid entering the main body 110 are perpendicular to each other.

[0093] The vertical air intake structure enables the gas to cut into the liquid flow with transverse momentum, forming an orthogonal shear effect. Through actual measurement, the turbulence intensity is increased by at least 50% compared with the co-directional air intake, the bubble breakup frequency is increased by at least 30%, and the initial atomization particle size is refined from 200μm to less than 100μm.

[0094] Moreover, the vertical air intake path shortens the gas flow distance, further reducing the pressure loss of the gas flowing into the throat section 112. Under the same gas cylinder pressure, the gas flow stability is improved by at least 20% (fluctuation ±5%).

[0095] At the same time, using the three-dimensional space orthogonal layout, the suction section 130 does not need to extend along the liquid flow direction, reducing the horizontal projection area of the gas-liquid mixing Venturi tube 10 to adapt to the compact space of the small bubble water device 1. And the vertical insertion design simplifies the gas path layout, reduces the number of bends of the gas pipe, avoids the problem of pipeline stress concentration caused by traditional oblique air intake, and improves the reliability of the long-term operation of the equipment.

[0096] In one embodiment, the inlet section 120 and the contraction section 111 form a water inlet channel, the suction section 130 forms an air inlet channel, the throat section 112, the expansion section 113 and the outlet section 140 form a mixing channel, the water inlet channel and the mixing channel are connected, the air inlet channel is connected to the mixing channel through the air cavity 114, and the mixing channel is used to mix the gas and the liquid.

[0097] Specifically, the water inlet channel is composed of the inlet section 120 and the contraction section 111. The inner diameter of the inlet section 120 can be set to 6mm, the large end inner diameter of the contraction section 111 can be set to 6mm, and the small end inner diameter can be set to 1.5mm, thus forming a gradually shrinking water flow channel. The air inlet channel is composed of the suction section 130 and the air cavity 114. The inner diameter of the suction section 130 can be set to 2mm, and the air cavity 114 is an annular cavity surrounding the contraction section 111, with a volume of 760mm3 The mixing channel consists of a throat section 112, a diffuser section 113, and an outlet section 140. The inner diameter of the throat section 112 can be set to 2 mm, the inner diameter of the small end of the diffuser section 113 can be set to 2 mm, the inner diameter of the large end can be set to 6 mm, and the inner diameter of the outlet section 140 can be set to 6 mm, and the length can be set to 200 mm.

[0098] With this channel structure design, water flow and gas enter the mixing channel through the water inlet channel and the gas inlet channel respectively. Inside the mixing channel, using the Venturi effect and fluid dynamics principles, efficient gas-liquid mixing is achieved. The tapered design of the water inlet channel accelerates the water flow, forming a negative pressure to suck in gas; the gas cavity 114 design of the gas inlet channel evenly distributes the gas; the designs of the throat section 112, diffuser section 113, and outlet section 140 of the mixing channel promote the formation, breakup, and stabilization of bubbles, thus improving the preparation efficiency and quality of the bubble water. The gas-liquid mixing effect is good, and the bubble concentration increases significantly.

[0099] In the technical solution of the present invention, by designing the diameter and length parameters of the throat section 112, its diameter is limited between 1 mm and 3 mm, and its length is limited between 9 mm and 15 mm. It provides a suitable flow channel space for gas-liquid mixing, enabling high-speed water flow and CO2 gas to be fully mixed and react within the throat section 112. The appropriate diameter and length not only ensure the water flow speed and the formation of negative pressure but also provide sufficient time and space for gas inhalation and mixing, improving the gas-liquid mass transfer efficiency, promoting the formation and refinement of bubbles, and thus enhancing the concentration and quality of the bubble water.

[0100] Please refer to Figure 1 and Figure 5 , the present invention also proposes a bubble water device 1. The bubble water device 1 includes the aforementioned gas-mixing Venturi tube 10. The specific structure of the gas-mixing Venturi tube 10 refers to the above embodiments. Since the bubble water device 1 adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here. Among them, the bubble water device 1 can be one of an under-counter water purifier, a tabletop water dispenser, a floor-standing water purifier, a direct drinking machine, or other types of drinking water equipment.

[0101] Please refer to Figure 5, in one embodiment, the sparkling water device 1 includes a housing 20, a water storage tank 30, a CO2 gas cylinder 40, and the aforementioned mixing Venturi tube 10; the housing 20 is provided with a water outlet 20a; the water storage tank 30 is arranged inside the housing 20; the CO2 gas cylinder 40 is detachably arranged inside the housing 20; the mixing Venturi tube 10 is arranged inside the housing 20, the inlet section 120 of the mixing Venturi tube 10 is communicated with the water outlet end of the water storage tank 30, the suction section 130 of the mixing Venturi tube 10 is communicated with the gas outlet end of the CO2 gas cylinder 40, the outlet section 140 of the mixing Venturi tube 10 is communicated with the water outlet 20a, and the mixing Venturi tube 10 is used for mixing gas and liquid.

[0102] Specifically, the housing 20 is arranged in a cuboid shape and can be made of ABS engineering plastic, which has the characteristics of light weight, durability and easy processing. The front surface of the housing 20 is provided with a water outlet 20a, and the water outlet 20a is a circular through hole. The water storage tank 30 is arranged inside the housing 20 and can be made of food-grade PP plastic. The bottom of the water storage tank 30 is provided with a water outlet end, and the water outlet end is connected to the inlet section 120 of the mixing Venturi tube 10 through a food-grade silicone hose. The water storage tank 30 is used for storing pure water or filtered water, and the water storage tank 30 can be configured to be detachably connected to the housing 20, or fixedly installed inside the housing 20 through a bracket or the like. The water in the water storage tank 30 can be that the user directly fills pure water into the water storage tank 30, or it can also be directly connected to the municipal tap water and flows into the water storage tank 30 after being filtered by the filtration module 50.

[0103] The CO2 gas cylinder 40 is detachably arranged inside the housing 20 and can be made of aluminum alloy material, meeting the food-grade safety standard. The CO2 gas cylinder 40 is filled with high-pressure CO2 gas, and its gas outlet end is provided with a standard thread interface, which is communicated with the suction section 130 of the mixing Venturi tube 10 through a stainless steel gas pipe. A quick-release joint connected to the CO2 gas cylinder 40 is provided on the gas pipe, which is convenient for the replacement of the CO2 gas cylinder 40.

[0104] The mixing Venturi tube 10 is arranged in the middle area inside the housing 20 and can be injection-molded with food-grade POM plastic, having good wear resistance and corrosion resistance. The inlet section 120 of the mixing Venturi tube 10 is communicated with the water outlet end of the water storage tank 30 through the aforementioned silicone hose, the suction section 130 is communicated with the gas outlet end of the CO2 gas cylinder 40 through a stainless steel gas pipe, and the outlet section 140 is communicated with the water outlet 20a through another silicone hose.

[0105] The gas-liquid mixing Venturi tube 10 is used to mix gas and liquid. The CO2 gas in the CO2 gas cylinder 40 will flow into the gas-liquid mixing Venturi tube 10 through the suction section 130, and the water in the water storage tank 30 will flow into the gas-liquid mixing Venturi tube 10 through the inlet section 120. Under the action of the gas-liquid mixing Venturi tube 10, using the Venturi effect (the pressure difference caused by the change in fluid flow rate), the CO2 gas is inhaled into the water and mixed and dissolved, and finally the bubble water flows through the outlet section 140 of the gas-liquid mixing Venturi tube 10 to the water outlet 20a for the user to drink the bubble water.

[0106] The water storage tank 30, the CO2 gas cylinder 40 and the gas-liquid mixing Venturi tube 10 can all be fixed on the bracket inside the housing 20 by bolts. The bracket can be made of metal or ABS engineering plastic to ensure the stable installation of each component. The connections of the inlet section 120, the suction section 130 and the outlet section 140 all adopt sealed threaded connections to ensure that the fluid will not leak. Or, it can also be directly injection-molded integrally with the main body part 110.

[0107] In this embodiment, the gas-liquid mixing Venturi tube 10 structure is adopted to inhale the CO2 gas into the water and mix and dissolve it, and finally form bubble water, without complex high-pressure equipment, reducing the cost and energy consumption, while ensuring the preparation efficiency and quality of the bubble water. Compared with the traditional carbonation tank structure, it has a smaller volume and occupies less space, and can make the components of the bubble water device 1 be compactly arranged in the housing 20, thereby reducing the overall volume of the bubble water device 1. Specifically, compared with the traditional high-pressure carbonation tank solution, the volume is reduced by at least 50%, and the weight is reduced by at least 40%, significantly improving the portability and space adaptability. And, the food-grade material and the sealed connection design ensure the water quality safety. The detachable CO2 gas cylinder 40 supports quick replacement, extending the single-use time, and the comprehensive cost is reduced by 50% compared with similar products.

[0108] Please refer to Figure 5 , further, the bubble water device 1 further includes a filtration module 50. The filtration module 50 is arranged upstream of the water storage tank 30. The water inlet side of the filtration module 50 is communicated with an external water source, and the water outlet side of the filtration module 50 is communicated with the water inlet end of the water storage tank 30.

[0109] Specifically, the filtration module 50 is arranged upstream of the water storage tank 30. The filtration module 50 may include a PP cotton filter element and an ultrafiltration filter element. The filtration accuracy of the PP cotton filter element can be configured to 5μm to remove large particulate impurities in the water; the filtration accuracy of the ultrafiltration filter element can be configured to 0.01μm to remove bacteria, colloids and organic matters in the water, etc. The water inlet side of the filtration module 50 is connected to the water pipe of the external water source by screwing or clamping, and the water outlet end is communicated with the water inlet end of the water storage tank 30 through a silica gel hose, also adopting the form of screwing or clamping.

[0110] The settings of the filtration module 50 ensure that the water entering the water storage tank 30 is fully filtered to meet the drinking water standard, improving the hygienic quality of the bubble water. The combined filtration of the PP cotton filter element and the ultrafiltration filter element effectively removes impurities and harmful substances in the water, providing a clean water source for subsequent gas-liquid mixing and bubble water preparation, and ensuring the health of users.

[0111] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A gas mixing venturi tube for a bubble water device, characterized in that: include: The pipe body comprises a main body, and an inlet section, an air intake section and an outlet section connected to the main body; the main body is provided with a contraction section, a throat section and an expansion section, the inlet section is connected to the contraction section, and the two ends of the expansion section are respectively connected to the throat section and the outlet section; The main body is also provided with an air cavity, and the air intake section is connected with the throat section through the air cavity; wherein the throat section has a diameter of D1 and a length of L1, satisfying 1mm≤D1≤3mm, and 9mm≤L1≤15mm.

2. The gas mixing venturi tube according to claim 1, characterized in that: The inner diameter of the inlet section is D2, satisfying 5.5 mm ≤ D2 ≤ 7 mm; and / or, The length of the inlet section is L2, satisfying 12mm≤L2≤18mm.

3. The gas mixing venturi tube according to claim 2, characterized in that: The inner diameter of the outlet section is D3, satisfying 5.8 mm ≤ D3 ≤ 7 mm; and / or, The length of the outlet section is L3, satisfying 180mm≤L3≤220mm.

4. The gas mixing venturi tube according to claim 3, characterized in that: The inner diameter of the air intake section is D4, satisfying 1.5 mm ≤ D4 ≤ 4 mm; and / or, The length of the air intake section is L4, satisfying 13 mm ≤ L4 ≤ 20 mm.

5. The gas mixing venturi tube according to claim 4, characterized in that: The contraction section is gradually contracted from one end of the inlet section toward a direction away from the inlet section, and the length of the contraction section is L5, which satisfies 8mm≤L5≤12mm, and / or, The expansion section is gradually expanded from one end of the throat section toward one end of the outlet section, and the length of the expansion section is L6, satisfying 13mm≤L6≤20mm.

6. The gas mixing venturi tube according to claim 5, characterized in that: The inner wall surface of the contraction section and the axis of the contraction section have an angle A that satisfies 12°≤A≤15°, and / or, An included angle B is formed between the inner wall surface of the expansion section and the axis of the expansion section, satisfying 6°≤B≤10°.

7. The gas mixing venturi tube according to claim 1, characterized in that: The inlet section, the contraction section, the throat section, the expansion section and the outlet section are coaxially arranged.

8. The gas mixing venturi tube according to any one of claims 1 to 7, characterized in that: The end of the contraction section close to the throat section is also provided with a nozzle section, the nozzle section is arranged corresponding to the throat section, and the diameter of the nozzle section is smaller than the diameter of the throat section.

9. The gas mixing venturi tube according to claim 8, characterized in that: The nozzle section at least partially extends into the throat section.

10. The gas mixing venturi tube according to claim 9, characterized in that: A throat guide surface is provided at the end of the throat section close to the nozzle section. The throat guide surface extends obliquely from the throat section to the nozzle section in a direction away from the throat section.

11. The gas mixing venturi tube according to claim 8, characterized in that: The diameter of the nozzle segment is D7, satisfying 1.2 mm ≤ D7 ≤ 1.8 mm; and / or, The length of the nozzle section is L7, satisfying 0.6 mm ≤ L7 ≤ 1.5 mm.

12. The gas mixing venturi tube according to any one of claims 1 to 7, characterized in that: The axis of the air intake section and the axis of the inlet section are perpendicular to each other.

13. The gas mixing venturi tube according to any one of claims 1 to 7, characterized in that: The inlet section and the contraction section form a water inlet channel, the air suction section forms an air inlet channel, the throat section, the expansion section and the outlet section form a mixing channel, the water inlet channel is connected to the mixing channel, the air inlet channel is connected to the mixing channel through the air cavity, and the mixing channel is used to mix gas and liquid.

14. A bubble water device, characterized in that: It comprises the gas mixing venturi tube as claimed in any one of claims 1 to 13.

Images