Gas-liquid mixing tube structure and washing equipment having the same

Abstract

The present invention relates to the field of gas-liquid mixing technology, and specifically provides a gas-liquid mixing tube structure and a washing device having the gas-liquid mixing tube structure, aiming to solve the problem of uneven mixing of air and water flow in existing microbubble generators. The gas-liquid mixing tube structure includes a first contraction tube section, a first expansion tube section, a second contraction tube section and a second expansion tube section which are connected in sequence, the inlet of the first contraction tube section is connected to a liquid inlet pipe, and at least one air inlet pipe is connected to the tube wall of the first expansion tube section. Through such a tube structure, the gas and liquid are mixed more evenly, which promotes the generation of microbubbles, and the structure is simple and easy to manufacture. The washing device includes a gas-liquid mixing structure, and under the action of the gas-liquid mixing tube structure, the washing device can use microbubble water with a large number of microbubbles to wash items, thereby improving the washing effect on the items and optimizing the user experience.

Description

Technical Field

[0001] The invention relates to the technical field of gas-liquid mixing, and in particular provides a gas-liquid mixing tube structure and a washing device having the gas-liquid mixing tube structure. Background Art

[0002] Microbubble water contains a large number of microbubbles at the micron and nanometer levels, which have good bactericidal and decontamination properties and are widely used in washing machines and other washing equipment. Microbubbles refer to bubbles with a diameter below the micron level.

[0003] In order to facilitate the formation of microbubbles, the patent (CN107321204A) discloses a microbubble generator, which includes an outer shell with openings at both ends, a water inlet pipe connected to the first end of the outer shell, a gas-liquid mixing tube and a hole network near the second end are arranged in the outer shell, and the gas-liquid mixing tube is formed with a connected accommodating chamber, an airflow portion, an acceleration portion and a circulation portion from the head to the tail, a conical vortex shell is arranged in the accommodating chamber, a vortex is arranged in the vortex shell, an air inlet is arranged on the tube wall of the airflow portion, and the inner wall of the airflow portion protrudes toward the direction of the accommodating chamber to form a funnel-shaped protrusion, and a gap is formed between the large mouth end of the funnel-shaped protrusion and the conical vortex shell for air entering through the air inlet to enter the airflow portion, and the inner diameter of the acceleration portion gradually increases toward the tail. The water flows through the vortex shell and forms a high-speed rotating water flow inside it. The high-speed rotating water flow flows out from the outlet of the vortex shell and enters the funnel-shaped space surrounded by the protrusion. Negative pressure is formed around the water flow, so that air is sucked in from the air inlet and mixed with the water flow and then enters the acceleration part. Due to the tapered surface of the vortex shell and the gradual increase in the inner diameter of the acceleration part toward the tail, a pressure difference is formed, which accelerates the flow of water mixed with air. The water with bubbles flows to the hole mesh through the circulation part, and the bubbles are cut to produce microbubbles.

[0004] The patent (CN107583480A) discloses a microbubble generator, which includes a shell with two ends being open, a water inlet pipe being connected to the first end of the shell, a bubble generating tube and a mesh near the second end being arranged in the shell, the bubble generating tube is sequentially formed with a receiving chamber, a gas-liquid mixing part, and an expansion guide part from the first end to the second end, a conical gas-liquid mixing space whose size gradually decreases from the first end to the second end is formed in the gas-liquid mixing part, and an expansion guide space whose size increases from the first end to the second end is formed in the expansion guide part. A conical boosting tube whose size decreases in the direction away from the first end is arranged in the receiving chamber, an air inlet channel is arranged on the tube wall of the bubble generating tube, a gap is formed between the inner wall of the gas-liquid mixing part and the outer wall of the boosting tube so as to communicate with the air inlet channel on the outer wall of the bubble generating tube, and the water outlet of the boosting tube is placed in the water inlet of the gas-liquid mixing part. The water flows through the booster pipe and is pressurized to form a high-speed water flow. After the high-speed water flow flows out from the water outlet of the booster pipe, it enters the gas-liquid mixing chamber to form a negative pressure. The gas is sucked into the water flow through the air inlet channel to form bubbles. The water flow mixed with air flows from the expansion guide part to the hole network, and the bubbles in the water flow are cut by the hole network to form microbubbles.

[0005] The above two microbubble generators can form microbubbles in the water flow after the water flows through. The main principle is to increase the flow rate of the water flow first, and the high-speed water flow enters the space where the space suddenly becomes larger to form a negative pressure, and sucks air through the air inlet channel to form a water flow mixed with bubbles. In the process of the water flow passing through the hole network, the bubbles in it are cut to form microbubbles. However, in the above two microbubble generators, the water flow is accelerated in a conical acceleration chamber whose diameter changes from large to small, and then enters a conical mixing chamber whose diameter changes from large to small, and the cross-sectional area at the inlet of the mixing chamber is larger than the cross-sectional area at the outlet of the acceleration chamber. In the process of the water flow entering the mixing chamber from the acceleration chamber, the circulation space suddenly increases, and negative pressure is generated around the water flow to suck air into the mixing chamber. In other words, after the circulation space increases, the circulation cross-sectional area gradually decreases, and the mixing space gradually decreases, which squeezes the water flow, making the mixing of air and water not uniform, thereby affecting the formation of microbubbles.

[0006] Accordingly, the art needs a new technical solution to solve the above problems. Summary of the invention

[0007] In order to solve the above-mentioned problems in the prior art, that is, to solve the problem of uneven mixing of air and water flow in the existing microbubble generator, the present invention provides a gas-liquid mixing tube structure, which includes a first contraction tube section, a first expansion tube section, a second contraction tube section and a second expansion tube section which are connected in sequence, the inlet of the first contraction tube section is connected to the liquid inlet pipe, and at least one air inlet pipe is connected to the tube wall of the first expansion tube section.

[0008] In a preferred technical solution of the above-mentioned gas-liquid mixing tube structure, the shrinkage rate of the second shrinkage tube section is greater than the shrinkage rate of the first shrinkage tube section.

[0009] In a preferred technical solution of the above-mentioned gas-liquid mixing tube structure, the expansion rate of the second expansion tube section is smaller than the expansion rate of the first expansion tube section.

[0010] In a preferred technical solution of the above-mentioned gas-liquid mixing tube structure, the first contraction tube section and the first expansion tube section are connected via a first equal-diameter tube section, and / or the second contraction tube section and the second expansion tube section are connected via a second equal-diameter tube section.

[0011] In a preferred technical solution of the above-mentioned gas-liquid mixing tube structure, the cross-sectional area at the outlet of the second contraction tube section is larger than the cross-sectional area at the outlet of the first contraction tube section.

[0012] In the preferred technical solution of the above-mentioned gas-liquid mixing tube structure, the first contracting tube section includes multiple cone sections connected in sequence; and / or the first expanding tube section includes multiple cone sections connected in sequence; and / or the second contracting tube section includes multiple cone sections connected in sequence; and / or the second expanding tube section includes multiple cone sections connected in sequence.

[0013] It can be understood by those skilled in the art that in the technical solution of the present invention, the gas-liquid mixing tube structure includes a first contraction tube section, a first expansion tube section, a second contraction tube section and a second expansion tube section which are connected in sequence, the inlet of the first contraction tube section is connected to the liquid inlet tube, and at least one air inlet tube is connected to the tube wall of the first expansion tube section. The liquid in the liquid inlet tube increases in velocity after flowing through the first contraction tube section, and then the liquid flows into the first expansion tube section at a high speed, the flow area in the first expansion tube section gradually increases, negative pressure is generated around the high-speed liquid flow, and the external gas is sucked into the first expansion tube section through the air inlet tube and mixed with the liquid to form bubbles in the liquid. The flow area of ​​the liquid flow in the first expansion tube section gradually increases, turbulence is formed in the first expansion tube section, and uniform mixing of gas and liquid is promoted. The liquid mixed with gas enters the second contraction tube section from the first expansion tube section, the flow velocity of the liquid in the second contraction tube section gradually increases, and the bubbles in the liquid are squeezed and broken into multiple small bubbles. After that, the accelerated liquid flows into the second expansion pipe section. As the cross-sectional area gradually increases, the liquid in the second expansion pipe section forms turbulence when flowing, and the bubbles in the liquid are cut into smaller bubbles, thereby forming a large number of microbubbles in the liquid. The liquid mixing tube structure of the present invention promotes the generation of microbubbles, ensures the number and uniformity of microbubbles, and has a simple structure and is easy to manufacture.

[0014] Preferably, the shrinkage rate of the second contraction tube section is greater than the shrinkage rate of the first contraction tube section. It should be noted that the shrinkage rate refers to the ratio of the difference between the cross-sectional area of ​​the large-size end and the cross-sectional area of ​​the small-size end of the contraction tube section to the contraction tube section. Since the air enters the first expansion tube section from the air inlet pipe, it will inevitably cause pressure loss in the first expansion tube section. Setting the shrinkage rate of the second contraction tube section to be greater than the shrinkage rate of the first contraction tube section ensures that the liquid mixed with gas can reach a higher flow rate after passing through the second contraction tube section, and then the liquid mixed with gas can form violent turbulence after entering the second expansion tube section, so as to cut the bubbles and form a large number of microbubbles.

[0015] Preferably, the expansion rate of the second expansion tube section is less than the expansion rate of the first expansion tube section. It should be noted that the expansion rate refers to the ratio of the difference between the cross-sectional area of ​​the large-sized end and the cross-sectional area of ​​the small-sized end of the expansion tube section to the expansion tube section. Through such an arrangement, the liquid mixed with gas can form a strong turbulence during the flow in the second expansion tube section, and the bubbles break and disperse into more tiny bubbles in the turbulence and mix with the liquid, further promoting the formation of microbubbles.

[0016] In addition, the present invention also provides a washing device, which includes the gas-liquid mixing tube structure described in any one of the technical solutions of the above-mentioned gas-liquid mixing tube structure. It should be noted that the washing device has all the technical effects of the above-mentioned gas-liquid mixing tube structure, which will not be repeated here. In addition, during the washing operation of the washing device, under the action of the gas-liquid mixing tube structure, the washing device can use microbubble water with a large number of microbubbles to wash the items, thereby improving the washing effect on the items and optimizing the user experience.

[0017] In a preferred technical solution of the above-mentioned washing device, the washing device includes a box body and a water tub arranged in the box body, the water tub is equipped with a water circulation pipeline, and the gas-liquid mixing tube structure is arranged on the water circulation pipeline.

[0018] In a preferred technical solution of the above washing device, a spray component is provided in the box above the water tub, a first end of the water circulation pipeline is connected to the bottom of the water tub, and a second end of the water circulation pipeline is connected to the spray component.

[0019] In the preferred technical solution of the above-mentioned washing device, a valve or an air pump is provided on the air inlet pipe. The provision of the valve can facilitate the user to supply washing water with microbubbles into the water tub as needed. The provision of the air pump can further increase the air intake amount in the air inlet pipe of the gas-liquid mixing tube structure, so that more microbubbles are generated after the washing water flows through the gas-liquid mixing tube structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings and in combination with a pulsator washing machine, wherein:

[0021] Figure 1 is a schematic structural diagram of a pulsator washing machine according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A magnified view of the part A in the middle;

[0023] Figure 3 It is a structural schematic diagram of a gas-liquid mixing tube structure in a pulsator washing machine according to another embodiment of the present invention.

[0024] List of reference numerals:

[0025] 11. Box body; 12. Plate base; 13. Upper cover; 21. Outer barrel; 22. Outer barrel cover; 31. Inner barrel; 32. Impeller; 33. Drive shaft; 34. Motor; 35. Balance ring; 36. Lint filter; 41. Drain pump; 42. Drain pipe; 51. Circulation pipe; 52. Circulation pump; 53. Nozzle; 61. First contraction pipe section; 611. First cone section; 612. Second cone section; 613. Third cone section; 62. First expansion pipe section; 63. Second contraction pipe section; 64. Second expansion pipe section; 65. First equal-diameter pipe section; 66. Inlet pipe; 67. Air pump. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although the present invention introduces and illustrates the washing device of the present invention in conjunction with a pulsator washing machine, those skilled in the art can make adjustments as needed to adapt to specific application scenarios, such as the washing device of the present invention can also be a drum washing machine, a washer-dryer, a shoe washing machine or a dishwasher. Obviously, the adjusted technical solution will still fall within the scope of protection of the present invention.

[0027] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In order to solve the problem of uneven mixing of air and water flow in the existing microbubble generator, the present invention provides a gas-liquid mixing tube structure, which includes a first contraction tube section, a first expansion tube section, a second contraction tube section and a second expansion tube section which are connected in sequence, the inlet of the first contraction tube section is connected to the liquid inlet pipe, and at least one air inlet pipe is connected to the tube wall of the first expansion tube section. In addition, the present invention also provides a washing device, which includes a box body and a water tub arranged in the box body, the water tub is equipped with a water circulation pipeline, and the water circulation pipeline is provided with the gas-liquid mixing tube structure. With the help of the gas-liquid mixing tube structure, the washing device can form microbubble water containing a large number of microbubbles in the water tub, thereby improving the washing effect.

[0030] Reference Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of a pulsator washing machine according to an embodiment of the present invention; Figure 2 yes Figure 1 The enlarged view of the part A in the figure. Figure 1 As shown, a pulsator washing machine (hereinafter referred to as washing machine) includes a housing 11, a pan seat 12 is provided on the upper part of the housing 11, and a top cover 13 is pivotally connected to the pan seat 12. An outer barrel 21 as a water storage tub is provided in the housing 11, and an outer barrel cover 22 is pivotally connected to the upper part of the outer barrel 21. An inner barrel 31 is provided in the outer barrel 21, and a pulsator 32 is provided at the bottom of the inner barrel 31. A motor 34 is fixed to the lower part of the outer barrel 21, and the motor 34 is connected to the pulsator 32 through a transmission shaft 33. A lint filter 36 is provided on the side wall of the inner barrel 31. A drain pump 41 is provided on a drain pipe 42, and the upstream end of the drain pipe 42 is connected to the bottom of the outer barrel 21. The washing machine also includes a water circulation pipeline, which includes a circulation pipe 51, a circulation pump 52 and a spray component, such as a nozzle 53. The lower end of the circulation pipe 51 is connected to the bottom of the outer barrel 21, and the upstream end of the circulation pipe 51 is connected to the nozzle 53. The nozzle 53 is fixed on the top of the outer barrel 21 and faces the inner barrel 31. The circulation pump 52 is connected in series on the circulation pipe 51 at a position lower than the bottom of the outer barrel 21, and a gas-liquid mixing pipe structure is arranged on the circulation pipe 51 between the circulation pump 52 and the nozzle.

[0031] like Figure 2As shown, the gas-liquid mixing pipe structure includes a first contraction pipe section 61, a first expansion pipe section 62, a second contraction pipe section 63 and a second expansion pipe section 64 which are connected in sequence. The inlet of the first contraction pipe section 61 is connected to the circulation pipe 51, and an air inlet pipe 66 is connected to the pipe wall of the first expansion pipe section 52. The cross-sectional area at the outlet of the second contraction pipe section 63 is larger than the cross-sectional area at the outlet of the first contraction pipe section 61.

[0032] During the operation of the washing machine, the circulation pump 52 is turned on, and part of the washing water in the outer barrel 21 is sucked into the circulation pipe 51 and flows through the gas-liquid mixing pipe structure and the nozzle 53 in sequence, and then enters the outer barrel 21 from the top of the outer barrel 21. The washing water flowing into the gas-liquid mixing pipe structure from the circulation pipe 51 first flows through the first contraction pipe section 61, and the flow rate increases under the action of the first contraction pipe section 61. Then, the washing water flows into the first expansion pipe section 62 at a higher speed, and the flow area in the first expansion pipe section 62 gradually increases. The washing water flows at a high speed, thereby generating negative pressure around the water column. The outside air is sucked into the first expansion pipe section 62 through the air inlet pipe 66 and mixed with the washing water to form bubbles in the washing water. The flow area of ​​the water flow in the first expansion pipe section 62 gradually increases, and turbulence is formed in the first expansion pipe section 62, which promotes the uniform mixing of air and washing water. The washing water mixed with air enters the second contraction pipe section 63 from the first expansion pipe section 62, and the flow rate of the washing water in the second contraction pipe section 63 gradually increases, and the bubbles in the washing water are squeezed and broken into multiple small bubbles. After that, the accelerated washing water flows into the second expansion pipe section 64. As the cross-sectional area gradually increases, the washing water in the second expansion pipe section 64 forms turbulence when flowing, and the bubbles in the washing water are cut into smaller bubbles, thereby forming a large number of microbubbles in the washing water. The washing water with a large number of microbubbles is sprayed into the inner tub 31 through the nozzle 53. The cross-sectional area at the outlet of the second contraction pipe section 63 is larger than the cross-sectional area at the outlet of the first contraction pipe section 61, ensuring that the washing water flows out of the second expansion pipe section 64 after being accelerated in the second contraction pipe section 63.

[0033] Through such continuous circulation, a large number of microbubbles are formed in the washing water in the inner barrel 31 and the outer barrel 21. During the washing process of the clothes in the inner barrel 31, a large number of microbubbles rub and collide with the stains on the clothes, and the microbubbles burst to release a large amount of energy, thereby separating the stubborn stains on the clothes from the clothing fibers, thereby improving the washing effect. The large number of microbubbles in the washing water can also promote the dissolution of detergents, improve the efficiency of detergent use, and there is no need to add excessive detergents to the washing water to form a set detergent concentration. In addition, the liquid mixing tube structure of the present invention can effectively promote the generation of microbubbles, ensure the number and uniformity of microbubbles, and has a simple structure and is easy to manufacture.

[0034] It can be understood by those skilled in the art that the washing device being a pulsator washing machine is only a specific embodiment, and those skilled in the art can adjust it as needed to adapt to specific applications, such as the washing device can also be a drum washing machine, a washer-dryer, a shoe washing machine or a dishwasher, etc. In addition, the number of the air inlet pipe 66 is only one, which is only a specific embodiment, and those skilled in the art can adjust it as needed to adapt to specific applications, such as multiple air inlet pipes can be set on the pipe wall of the first expansion pipe section 62, and the number of air inlet pipes can be 2, 3, 4, etc., and the multiple air inlet pipes can be evenly or unevenly distributed around the axis of the first expansion pipe section 62, or evenly or unevenly distributed along the axis of the first expansion pipe section 62. In addition, the nozzle 53 as a spray component is only a specific embodiment, and those skilled in the art can adjust it as needed to adapt to specific applications, such as the spray component can also be a spray rod, etc. The arrangement of the gas-liquid mixing tube structure on the water circulation pipeline is only a specific implementation method, and those skilled in the art can make adjustments to it as needed. For example, the gas-liquid mixing tube structure can be arranged on the water inlet pipeline of the washing machine. When the water inlet pipeline feeds water into the outer barrel 21 of the washing machine, a large number of microbubbles are formed in the water flow under the action of the gas-liquid mixing tube structure, and the washing water containing a large number of microbubbles enters the outer barrel 21 for washing clothes; the gas-liquid mixing tube structure can also be arranged on the water inlet pipeline of the detergent delivery box, and the formed bubble water first enters the detergent delivery box and carries the detergent into the outer barrel of the washing machine.

[0035] Continue to refer to Figure 1 Preferably, an air pump 67 is provided on the air inlet pipe 66. For example, before washing, in order to form a large number of microbubbles in the washing water, the air pump 67 can be turned on at this time, and the air pump 67 pumps a large amount of air into the first expansion pipe section 62 through the air pipe 66. A large amount of air forms a larger number of microbubbles under the action of the gas-liquid mixing tube structure, so that a large number of microbubbles are quickly formed in the washing water in the inner tub 31 and the outer tub 21, shortening the duration of the washing preparation stage.

[0036] In an alternative embodiment, a valve, such as a solenoid valve, is provided on the air inlet pipe 66. The controller on the washing machine controls the opening and closing of the air inlet pipe 66 by controlling the solenoid valve, thereby controlling whether microbubbles are formed in the circulating washing water. For example, when it is necessary to generate microbubbles in the washing water to improve the washing effect, the solenoid valve is controlled to connect the air inlet pipe 66 with the air, so that microbubbles are formed inside the washing water after the washing water flows through the gas-liquid mixing tube structure. When there are too many bubbles in the washing water in the inner barrel 31 and the outer barrel 21, in order to avoid further increase of the bubbles, the solenoid valve is controlled to disconnect the air inlet pipe 66 from the air, so as to prevent air from entering the first expansion pipe section 62 through the air inlet pipe 66, thereby preventing the generation of microbubbles from causing further increase of bubbles in the washing water.

[0037] Continue to refer to Figure 2 Preferably, the contraction rate of the second contraction tube section 63 is greater than the contraction rate of the first contraction tube section 61, and the expansion rate of the second expansion tube section 64 is less than the expansion rate of the first expansion tube section 62. Specifically, the first contraction tube section 61, the first expansion tube section 62, the second contraction tube section 63 and the second expansion tube section 64 are all a conical section, the taper of the second contraction tube section 63 is greater than the taper of the first contraction tube section 61, and the taper of the second expansion tube section 64 is less than the taper of the first expansion tube section 62. The contraction rate of the second contraction tube section 63 is greater than the contraction rate of the first contraction tube section 61, which ensures that the washing water mixed with air can reach a higher flow rate after passing through the second contraction tube section 63, and then the washing water mixed with air can form a violent turbulence after entering the second expansion tube section 64, so as to cut the bubbles and form a large number of microbubbles. The expansion rate of the second expansion tube section 64 is less than the expansion rate of the first expansion tube section 62, which can form a strong turbulence in the process of the washing water mixed with air flowing in the second expansion tube section 64, further promoting the formation of microbubbles.

[0038] Those skilled in the art will appreciate that the first contracting tube segment 61, the first expanding tube segment 62, the second contracting tube segment 63, and the second expanding tube segment 64 are all a conical segment, which is only a specific implementation method, and those skilled in the art can adjust it as needed to adapt to specific application scenarios. For example, the first contracting tube segment 61, the first expanding tube segment 62, the second contracting tube segment 63, and the second expanding tube segment 64 can all be a pyramid segment with a gradually decreasing cross-sectional area or other suitable structures.

[0039] Continue to refer to Figure 2 Preferably, the first contraction pipe section 61 and the first expansion pipe section 62 are connected through the first equal-diameter pipe section 65. With such a configuration, the washing water enters the first equal-diameter pipe section 65 after being accelerated in the first contraction pipe section 61. Since the inner diameter of the first equal-diameter pipe section 65 remains unchanged, the flow direction of the accelerated water flow in the first equal-diameter pipe section 65 is gradually adjusted, and the water flow from the first equal-diameter pipe section 65 to the first expansion pipe section 62 is more concentrated and the flow is more stable. When the water column just enters the first expansion pipe section 62, negative pressure can be better formed around the water column, promoting air to enter the first expansion pipe section 62 from the air inlet pipe 66 and mix with the washing water. It can be understood by those skilled in the art that the second contraction pipe section 63 and the second expansion pipe section 64 can also be connected through the second equal-diameter pipe section, and the washing water mixed with air enters the second equal-diameter pipe section after being accelerated in the second contraction pipe section 63 and enters the second expansion pipe section 64 after being rectified.

[0040] Reference Figure 3 , Figure 3 FIG. 1 is a schematic diagram of the structure of the gas-liquid mixing tube in a pulsator washing machine according to another embodiment of the present invention. Figure 3 As shown, the first contraction pipe section 61 includes a first cone section 611, a second cone section 612 and a third cone section 613 connected in sequence. Through such a setting, the water flow can enter the first equal-diameter pipe section 65 after being accelerated multiple times in the first cone section 611, the second cone section 612 and the third cone section 613. It can be understood by those skilled in the art that the first contraction pipe section 61 includes the first cone section 611, the second cone section 612 and the third cone section 613 connected in sequence, which is only a specific embodiment. Those skilled in the art can adjust it as needed to adapt to specific application occasions, such as the first contraction pipe section 61 can include 2 cone sections, 4 cone sections, 5 cone sections, etc. In addition, the first expansion pipe section 62 can also include multiple cone sections connected in sequence, the second contraction pipe section 63 can also include multiple cone sections connected in sequence, and the second expansion pipe section 64 includes multiple cone sections connected in sequence.

[0041] It can be seen from the above description that in the technical solution of the present invention, the gas-liquid mixing tube structure includes a first contraction tube section, a first expansion tube section, a second contraction tube section and a second expansion tube section which are connected in sequence, the inlet of the first contraction tube section is connected to the liquid inlet pipe, and the tube wall of the first expansion tube section is connected to the air inlet pipe. Through such a tube structure, the liquid accelerated by the first contraction tube section can be better mixed with the inhaled gas as the flow area of ​​the first expansion tube section increases after entering the first expansion tube section, thereby ensuring uniform mixing of gas and liquid, and the structure is simple and easy to manufacture. The contraction rate of the second contraction tube section is greater than the contraction rate of the first contraction tube section, and the expansion rate of the second expansion tube section is less than the expansion rate of the first expansion tube section, which further promotes the formation of microbubbles and improves the uniformity of microbubbles in the liquid.

[0042] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A gas-liquid mixing tube structure, characterized in that: The gas-liquid mixing tube structure includes a first contraction tube section, a first expansion tube section, a second contraction tube section and a second expansion tube section which are connected in sequence, the inlet of the first contraction tube section is connected to the liquid inlet pipe, at least one air inlet pipe is connected to the tube wall of the first expansion tube section, the contraction rate of the second contraction tube section is greater than the contraction rate of the first contraction tube section, and the expansion rate of the second expansion tube section is less than the expansion rate of the first expansion tube section.

2. The gas-liquid mixing tube structure according to claim 1, characterized in that: The first contraction pipe section and the first expansion pipe section are connected via a first equal-diameter pipe section, and / or the second contraction pipe section and the second expansion pipe section are connected via a second equal-diameter pipe section.

3. The gas-liquid mixing tube structure according to claim 1, characterized in that: The cross-sectional area at the outlet of the second contraction tube section is larger than the cross-sectional area at the outlet of the first contraction tube section.

4. The gas-liquid mixing tube structure according to claim 1, characterized in that: The first contraction tube section comprises a plurality of conical sections connected in sequence; and / or The first expansion pipe section comprises a plurality of cone sections connected in sequence; and / or The second contraction tube section comprises a plurality of conical sections connected in sequence; and / or The second expansion tube section includes a plurality of cone sections connected in sequence.

5. A washing device, characterized in that it comprises the gas-liquid mixing tube structure according to any one of claims 1 to 4.

6. The washing device according to claim 5, characterized in that: It comprises a box body and a water tub arranged in the box body, the water tub is equipped with a water circulation pipeline, and the gas-liquid mixing pipe structure is arranged on the water circulation pipeline.

7. The washing device according to claim 6, characterized in that: A spray component is disposed in the box above the tub, a first end of the water circulation pipeline is connected to the bottom of the tub, and a second end of the water circulation pipeline is connected to the spray component.

8. The washing device according to claim 7, characterized in that: The air inlet pipe is provided with a valve or an air pump.

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