CN113106699B - Microbubble shower nozzle and have washing equipment of this microbubble shower nozzle - Google Patents

Abstract

The invention relates to a micro-bubble spray head and washing equipment with the same. The microbubble spray head comprises an integrated spray pipe and a microbubble bubbler fixed on the outlet end of the spray pipe, wherein a tapered channel part with a smaller diameter is arranged in the spray pipe, at least one level of tapered channel with a smaller diameter is formed in the tapered channel part with a smaller diameter along the water flow direction, a spray hole is formed on the downstream end of the tapered channel part with a smaller diameter, and the spray hole is configured to generate negative pressure in the integrated spray pipe after water flow pressurized by the tapered channel with a smaller diameter is sprayed out of the spray hole; an air suction port is arranged on the integrated spray pipe and is positioned close to the spray hole so that air is sucked into the integrated spray pipe through the air suction port by means of negative pressure and is mixed with water flow to generate bubble water; and the microbubble bubbler includes at least two stages of screens spaced apart from each other by a predetermined distance in a water flow direction to change the bubble water into the microbubble water. The microbubble nozzle has excellent microbubble generation performance, although it has a simple structure.

Description

Micro bubble nozzle and washing equipment having the same

Technical Field

The invention relates to a micro-bubble generating device, in particular to a micro-bubble nozzle and a washing device having the micro-bubble nozzle.

Background technique

Microbubbles usually refer to tiny bubbles with a diameter of less than 50 microns (μm) when bubbles occur. Microbubbles can also be called micro/nano-bubbles, micron bubbles or nano-bubbles according to their diameter range. Microbubbles have low buoyancy in liquids, so they stay in liquids for a long time. In addition, microbubbles shrink in liquids until they finally break, generating smaller nanobubbles. In this process, the bubbles become smaller, so their rising speed becomes slow, resulting in high melting efficiency. When microbubbles break, high pressure and high temperature heat are generated locally, which can destroy foreign matter such as organic matter floating in the liquid or attached to objects. In addition, the contraction process of microbubbles is also accompanied by an increase in negative charge. The peak state of negative charge is usually when the diameter of the microbubble is 1-30 microns, so it is easy to absorb positively charged foreign matter floating in the liquid. The result is that the foreign matter will be absorbed by the microbubbles after it is destroyed by the breaking of the microbubbles, and then slowly float to the surface of the liquid. These characteristics make microbubbles have strong cleaning and purification capabilities. At present, microbubbles have been widely used in washing machines and other washing equipment.

In order to produce microbubbles, microbubble generating devices of different structures have been developed. For example, a Chinese invention patent application (CN107321204A) discloses a microbubble generator. The microbubble generator includes a shell with two ends being open, a water inlet pipe is connected to the first end of the shell, and a vortex column, a vortex column shell, a gas-liquid mixing tube and a mesh positioned at the second end of the shell are sequentially arranged along the water flow direction in the shell. The gas-liquid mixing tube is sequentially formed with a connected accommodating cavity, an airflow portion, an acceleration portion and a circulation portion from the head to the tail. The vortex column shell and the vortex column located therein are positioned in the accommodating cavity; an air inlet is provided on the tube wall of the airflow portion; the inner wall of the airflow portion protrudes toward the direction of the accommodating cavity 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 column shell for the air entering from the air inlet to enter the airflow portion; the inner diameter of the acceleration portion gradually increases toward the tail. Water flows through the vortex to form a high-speed rotating water flow inside the vortex shell. 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. The negative pressure formed around the water flow draws air in from the air inlet and mixes with the water flow before entering the acceleration part. Since the conical surface of the vortex shell and the inner diameter of the acceleration part gradually increase toward the tail direction, a pressure difference is formed, which accelerates the flow of water mixed with a large amount of air (forming bubble water), and the bubble water flows to the hole mesh through the circulation part, and the bubble water is cut and mixed by the fine holes in the hole mesh to produce microbubble water containing a large number of microbubbles.

The Chinese invention patent application (CN107583480A) also discloses a microbubble generator. The microbubble generator includes a shell with two ends being open, a water inlet pipe is connected to the first end of the shell, and a boosting pipe, a bubble generating pipe and a mesh positioned at the second end of the shell are sequentially arranged in the shell along the direction of water flow. The bubble generating pipe 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. The boosting pipe is received in the receiving chamber, and the boosting pipe has a tapered end facing the receiving chamber; a tapered gas-liquid mixing space with a size gradually decreasing along the direction from the first end to the second end is formed in the gas-liquid mixing part; and an expansion guide space with a size increasing along the direction from the first end to the second end is formed in the expansion guide part. An air inlet channel is provided on the tube wall of the bubble generating tube, and a gap is formed between the inner wall of the gas-liquid mixing part and the outer wall of the boosting pipe so as to communicate with the air inlet channel on the tube wall of the bubble generating tube, and the water outlet of the boosting pipe is placed in the water inlet of the gas-liquid mixing part. The water flows through the boosting pipe and is pressurized to form a high-speed water flow. After the high-speed water flows out from the water outlet of the boosting pipe, it enters the gas-liquid mixing chamber and forms a negative pressure in the gas-liquid mixing chamber. The negative pressure draws a large amount of air into the water flow through the air inlet channel and mixes the air and water to form bubble water. The bubble water flows from the expansion guide part to the hole network, and the bubble water is mixed and cut by the fine pores of the hole network to form micro bubble water.

Both of the above-mentioned microbubble generators have at least five independent components: a housing, a water inlet pipe, a vortex column and a volute or a booster pipe, a gas-liquid mixing pipe or a bubble generating pipe, and a mesh. These components all require a specific matching or connecting structure to be designed so that all the components can be assembled together and the assembled microbubble generator can work reliably. Therefore, the components and structures of such a microbubble generator are relatively complex, and the manufacturing cost is also high.

Accordingly, the art needs a new technical solution to solve the above problems.

Summary of the invention

In order to solve the above-mentioned problems in the prior art, that is, to solve the technical problems of the complex structure and high manufacturing cost of the existing microbubble generator, the present invention provides a microbubble nozzle, the microbubble nozzle includes an integrated nozzle and a microbubble generator fixed on the outlet end of the integrated nozzle, a tapered channel portion with a reduced diameter is provided in the integrated nozzle, at least one level of tapered channel with a reduced diameter is formed in the tapered channel portion along the water flow direction, and a spray hole is formed on the downstream end of the tapered channel portion with a reduced diameter, the spray hole is configured to generate a negative pressure in the integrated nozzle after the water flow pressurized by the at least one level of tapered channel with a reduced diameter is sprayed out from the spray hole; an air intake port is provided on the integrated nozzle, the air intake port is positioned close to the spray hole so that air is sucked into the integrated nozzle through the air intake port by means of the negative pressure and mixed with the water flow to generate bubble water; and the microbubble generator includes at least two levels of filters spaced a predetermined distance from each other along the water flow direction to convert the bubble water into microbubble water.

In the preferred technical solution of the above-mentioned micro-bubble nozzle, the at least one-stage diameter-decreasing tapered channel includes a first-stage diameter-decreasing tapered channel and a second-stage diameter-decreasing tapered channel.

In the preferred technical solution of the above-mentioned micro-bubble nozzle, a flow-turbulating portion is formed on the inner wall of the tapered channel portion with a decreasing diameter.

In the preferred technical solution of the above-mentioned micro-bubble nozzle, the diameter of the nozzle hole is in the range of 0-6 mm.

In the preferred technical solution of the above-mentioned microbubble nozzle, the at least two-stage filter screen includes a first-stage filter screen and a second-stage filter screen, the first-stage filter screen includes at least one layer of filter screen, and the number of layers of the first-stage filter screen is less than the number of layers of the second-stage filter screen.

In the preferred technical solution of the above-mentioned micro-bubble nozzle, the micro-bubble bubbler includes a grid frame to fix the at least two stages of filter screens together.

In the preferred technical solution of the above-mentioned micro-bubble nozzle, the grid is directly fixed on the outlet end of the integrated nozzle.

In the preferred technical solution of the above-mentioned micro-bubble nozzle, the micro-bubble bubbler further includes a fixing member and the grid is fixed to the outlet end of the integrated nozzle through the fixing member.

In the preferred technical solution of the above-mentioned micro-bubble nozzle, at least one of the grid and the fixing member is provided with an overflow port.

It can be understood by those skilled in the art that in the technical solution of the present invention, the microbubble nozzle includes an integrated nozzle and a microbubble bubbler installed on the outlet end of the integrated nozzle. A tapered channel portion with a reduced diameter is provided in the integrated nozzle, and at least one tapered channel with a reduced diameter is formed along the direction of the water flow in the tapered channel portion with a reduced diameter. When the water flows through the at least one tapered channel with a reduced diameter, the water flow is pressurized and accelerated. A spray hole is formed on the downstream end of the tapered channel portion with a reduced diameter. The pressurized water flow will be ejected from the spray hole in a rapidly expanding manner, thereby causing negative pressure in the downstream channel of the integrated nozzle. An air intake port is provided on the integrated nozzle, and the air intake port is positioned close to the spray hole. As a result, a large amount of air is sucked into the integrated nozzle through the air intake port under the action of negative pressure from the outside and mixed with the water flow to produce bubble water containing a large number of bubbles. The microbubble bubbler includes at least two levels of filter screens spaced a predetermined distance apart from each other along the direction of the water flow, so that the bubble water can be cut and mixed by passing through each level of filter screen in turn, thereby more effectively generating microbubble water containing a large number of microbubbles. In the technical solution of the microbubble nozzle of the present invention, the function of generating microbubbles is achieved by a tapered channel portion with a reduced diameter designed in an integrated nozzle and a microbubble bubbler fixed at the outlet end of the integrated nozzle. Therefore, compared with the microbubble generator with many parts in the prior art, the microbubble nozzle of the present invention has a simple structure and thus a significantly reduced manufacturing cost, but has excellent microbubble generation performance.

Preferably, more than one level of tapered passages with decreasing diameters can provide a higher degree of pressurization and acceleration to the water flow.

Preferably, the spoiler can help the water flow to mix the sucked air more effectively downstream by increasing the turbulence of the water.

Preferably, the overflow port is designed to prevent excess water from flooding the air intake port, thereby preventing the air intake port from being blocked and preventing air from being sucked into the integrated nozzle, thereby preventing microbubble water from being produced.

The present invention also provides a washing device, comprising any one of the microbubble nozzles as described above, wherein the microbubble nozzle is configured to generate microbubble water in the washing device. The microbubble nozzle generates microbubble water containing a large number of microbubbles in the washing device, thereby not only improving the cleaning ability of the washing device, but also reducing the amount of detergent used and reducing the amount of detergent remaining in, for example, clothing.

BRIEF DESCRIPTION OF THE DRAWINGS

The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

FIG1 is a schematic structural diagram of an embodiment of a washing device including a micro-bubble nozzle according to the present invention;

FIG2 is a schematic structural diagram of another embodiment of a washing device including a micro-bubble nozzle according to the present invention;

FIG3 is a perspective schematic diagram of an embodiment of a micro-bubble nozzle of the present invention;

FIG4 is a top view of the embodiment of the micro-bubble nozzle of the present invention shown in FIG3;

FIG. 5 is a left side view of the embodiment of the micro bubble nozzle of the present invention shown in FIG. 3

FIG6 is a front view of the embodiment of the micro-bubble nozzle of the present invention shown in FIG3;

FIG7 is a cross-sectional view of an embodiment of a micro-bubble nozzle of the present invention taken along the section line A-A of FIG6 ;

FIG8 is a cross-sectional view of an embodiment of a micro-bubble nozzle of the present invention taken along the section line B-B of FIG6 ;

FIG9 is an exploded perspective view of a first embodiment of a micro-bubble nozzle of the present invention;

FIG. 10 is an exploded perspective view of a second embodiment of a micro-bubble nozzle according to the present invention.

List of reference numerals:

1. Pulsator washing machine; 11. Box; 12. Plate seat; 13. Upper cover; 14. Foot of pulsator washing machine; 21. Outer barrel; 31. Inner barrel; 311. Dehydration hole; 32. Pulsator; 33. Drive shaft of pulsator washing machine; 34. Motor of pulsator washing machine; 35. Balance ring; 41. Drain valve; 42. Drain pipe; 51. Inlet valve; 52. Micro bubble nozzle; 521. Integrated nozzle; 522. Micro bubble aerator; 211. Inlet end; 212. Outlet end; 212a. External thread; 212b. Slot; 213. Stopper; 214A. First fixed installation part; 214B. Second fixed installation part; 215. Positioning part; 216. Air inlet; 217. Spray hole; 218. Disturbance Flow portion; 219, diameter-decreasing tapered channel portion; 219a, first-stage diameter-decreasing tapered channel; 219b, second-stage diameter-decreasing tapered channel; 221, filter; 221a, first-stage filter; 221b, second-stage filter; 222; fixing member; 223, overflow port of fixing member; 224; connecting portion of second-stage filter; 225, grid; 226, overflow port of grid; 300, annular gap; 9, drum washing machine; 91, outer shell; 92, outer drum; 93, inner drum; 931, motor of drum washing machine; 932, transmission shaft of drum washing machine; 933, bearing; 94, upper panel; 95, control panel; 96, observation window; 97, door body; 98, foot of drum washing machine.

Detailed ways

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 protection scope of the present invention.

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" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

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.

In order to solve the problems of complex structure and high manufacturing cost of the existing microbubble generator, the present invention provides a microbubble nozzle, which includes an integrated nozzle 521 and a microbubble generator 522 fixed on the outlet end 212 of the integrated nozzle 521 (see Figure 3-10). A tapered channel portion 219 with a reduced diameter is provided in the integrated nozzle 521. At least one level of tapered channel with a reduced diameter is formed along the water flow direction C in the tapered channel portion 219. A spray hole 217 is formed on the downstream end of the tapered channel portion 219, and the spray hole 217 is configured to generate negative pressure in the integrated nozzle 521 after the water flow pressurized by at least one level of tapered channel with a reduced diameter is ejected from the spray hole 217. An air inlet 216 is provided on the integrated nozzle 521, and the air inlet 216 is positioned close to the spray hole 217 so that air is sucked into the integrated nozzle 521 through the air inlet 216 by means of negative pressure and mixed with the water flow to generate bubble water. The micro-bubble bubbler 522 includes at least two levels of filters 221 spaced a predetermined distance apart from each other along the water flow direction C to convert the bubble water into micro-bubble water. Therefore, compared with the micro-bubble generator of the prior art, the number of components and the structure of the micro-bubble nozzle of the present invention are greatly simplified, and the manufacturing cost of the micro-bubble nozzle is also greatly reduced, but the micro-bubble nozzle has a good micro-bubble generation performance.

The "conical channel portion with decreasing diameter" mentioned in this article refers to a structure in which the diameter of the channel formed inside the portion or the cross section transverse to the water flow direction gradually decreases so that the channel has a roughly conical shape.

The microbubble nozzle of the present invention can be applied in the field of washing, sterilization, or other fields requiring microbubbles. For example, the microbubble nozzle of the present invention can be applied to washing equipment, and can also be combined with bathroom faucets or showers.

Therefore, the present invention also provides a washing device, which includes the microbubble nozzle 52 of the present invention. The microbubble nozzle 52 is configured to generate microbubble water in the washing device. The microbubble nozzle generates microbubble water containing a large number of microbubbles in the washing device, which can not only improve the washing ability of the washing device, but also reduce the amount of detergent used and reduce the amount of detergent remaining in, for example, clothes, thereby not only benefiting the health of users, but also improving the user experience.

Referring to Fig. 1, Fig. 1 is a schematic structural diagram of an embodiment of a washing device with a micro-bubble nozzle of the present invention. In this embodiment, the washing device is a pulsator washing machine 1. Alternatively, in other embodiments, the washing device may be a drum washing machine or a drying machine.

As shown in FIG1 , a pulsator washing machine 1 (hereinafter referred to as a washing machine) includes a housing 11. A foot 14 is provided at the bottom of the housing 11. A pan seat 12 is provided at the upper part of the housing 11, and an upper 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. 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 dehydration hole 311 is provided on the side wall of the inner barrel 31 near the top. A drain valve 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 inlet valve 51 and a micro-bubble nozzle 52 connected to the water inlet valve 51, and the micro-bubble nozzle 52 is installed on the top of the outer barrel 21. Water enters the microbubble nozzle 52 via the water inlet valve 51 to produce microbubble water containing a large number of microbubbles. The microbubble nozzle 52 first sprays the microbubble water into the detergent box to mix with the detergent, and then enters the inner barrel 31 via the detergent box for washing clothes. The microbubbles in the water collide with the detergent during the crushing process, and the microbubbles can also adsorb the detergent through the negative charge they carry, so the microbubbles can increase the degree of mixing of the detergent and the water, thereby reducing the amount of detergent used and reducing the amount of detergent remaining on the clothes. In addition, the microbubbles will also collide with the stains on the clothes in the inner barrel 31, and will adsorb foreign matter that produces stains. Therefore, the microbubbles also enhance the decontamination performance of the washing machine. Optionally, the microbubble nozzle can also directly spray the microbubble water carrying a large number of microbubbles into the outer barrel 21 or the inner barrel 31 of the washing machine to further reduce the amount of detergent used and enhance the cleaning ability of the washing machine.

Referring to Fig. 2, Fig. 2 is a schematic structural diagram of another embodiment of a washing device with a micro-bubble nozzle according to the present invention. In this embodiment, the washing device is a drum washing machine 9.

As shown in FIG. 2 , the drum washing machine 9 includes a housing 91 and a foot 98 at the bottom of the housing. An upper panel 94 is provided on the top of the housing 91. A door 97 is provided on the front side (the operation side facing the user) of the housing 91 to allow the user to load clothes into the drum washing machine, and an observation window 96 is also provided on the door 97 to see the inside of the washing machine. A sealing window gasket 961 is also provided between the observation window 96 and the housing 91, and the sealing window gasket 961 is fixed to the housing 91. The control panel 95 of the drum washing machine 9 is arranged at the upper part of the front side of the housing 91 for the convenience of user operation. An outer drum 92 and an inner drum 93 are arranged inside the housing 91. The inner drum 93 is positioned inside the outer drum 92. The inner drum 93 is connected to a motor 931 (e.g., a direct drive motor) through a transmission shaft 932 and a bearing 933. A water inlet valve 51 is provided on the upper part of the rear side of the housing 91, and the water inlet valve 51 is connected to the micro bubble nozzle 52 through a water pipe. As shown in FIG. 2 , the microbubble nozzle 52 is positioned near the upper front side of the housing 91 and below the control panel 95. Similar to the above-mentioned embodiment, water enters the microbubble nozzle 52 through the water pipe via the water inlet valve 51 to generate microbubble water containing a large number of microbubbles. The microbubble nozzle 52 first sprays the microbubble water into the detergent box to mix with the detergent, and then enters the inner drum 93 via the detergent box for washing clothes. Optionally, the microbubble nozzle 52 can also directly spray the microbubble water carrying a large number of microbubbles into the outer drum 92 or the inner drum 93 of the washing machine to further reduce the amount of detergent used and enhance the cleaning ability of the washing machine.

Referring to Fig. 3-Fig. 8, Fig. 3-Fig. 8 are schematic diagrams of embodiments of the micro-bubble nozzle of the present invention, wherein Fig. 3 is a three-dimensional schematic diagram of an embodiment of the micro-bubble nozzle of the present invention, Fig. 4 is a top view of the embodiment of the micro-bubble nozzle of the present invention shown in Fig. 3, Fig. 5 is a left view of the embodiment of the micro-bubble nozzle of the present invention shown in Fig. 3, Fig. 6 is a front view of the embodiment of the micro-bubble nozzle of the present invention shown in Fig. 3, and Fig. 7 and Fig. 8 are cross-sectional views of the embodiment of the micro-bubble nozzle of the present invention taken along the section lines A-A and B-B of Fig. 5, respectively. As shown in Fig. 3-8, in one or more embodiments, the micro-bubble nozzle 52 of the present invention includes an integrated nozzle 521. A micro-bubble bubbler 522 is installed on the outlet end 212 of the integrated nozzle 521, and the bubbler 522 is configured to cut and mix the bubble water when the bubble water flows through it to produce micro-bubble water containing a large number of micro-bubbles.

3, in one or more embodiments, the integrated nozzle 521 has an inlet end 211 and an outlet end 212. A microbubble generator 522 is fixed to the outlet end 212, and the inlet end 211 is used to connect to an external water source. Optionally, a stopper 213 may be provided on the inlet end 211, such as a stopper rib that protrudes radially outward around the outer wall of the inlet end 211 or an annular groove structure that is recessed inward on the outer wall of the inlet end 211, which can prevent the integrated nozzle from falling off from the pipe that provides the water source to which it is connected.

3 , in one or more embodiments, a first fixing portion 214A, a second fixing portion 214B, and a positioning portion 215 are provided on the outer wall of the integrated nozzle 521 for positioning and fixing the micro bubble nozzle 52 to a predetermined position.

4 to 6, the first fixed mounting portion 214A and the second fixed mounting portion 214B are symmetrically positioned on the outer wall of the integrated nozzle 521 and are located in the middle of the integrated nozzle 521. The positioning portion 215 is a long rib that protrudes radially outward from the outer wall of the integrated nozzle 521 and extends along the longitudinal direction of the integrated nozzle 521. The first fixed mounting portion 214A and the second fixed mounting portion 214B are distributed on both sides of the positioning portion 215. Optionally, only one fixed mounting portion is provided on the integrated nozzle 521, and the positioning portion 215 may also adopt other suitable forms.

In one or more embodiments, the first and second fixed mounting portions 214A, 214B are screw hole structures to fix the spray head 52 to a target position on, for example, a washing device by screws. However, the fixed mounting portion can adopt any suitable connection structure, such as a snap connection structure, a welding connection structure, etc.

7 and 8, a reduced diameter channel portion 219 is provided in the integrated nozzle 521, and a first-stage reduced diameter tapered channel 219a and a second-stage reduced diameter tapered channel 219b are provided in the reduced diameter tapered channel portion 219 along the water flow direction C. The first-stage reduced diameter tapered channel 219a extends from the inlet end 211 of the integrated nozzle 521 to the second-stage reduced diameter tapered channel 219b. A spray hole 217 is formed on the downstream end of the reduced diameter channel portion 219. The spray hole 217 directly connects the second-stage directly reduced diameter tapered channel 219b located upstream thereof and the downstream channel in the integrated nozzle 521 located downstream thereof, thereby connecting the first-stage reduced diameter tapered channel 219a and the second-stage reduced diameter tapered channel 219b with the downstream channel of the integrated nozzle 521. Preferably, the diameter of the spray hole 217 is in the range of 0-6 mm; more preferably, the diameter of the spray hole 217 is in the range of 1.2-3.5 mm. In one or more alternative embodiments, only one level of tapered channel with reduced diameter may be formed in the tapered channel portion 219 , or more than two levels of tapered channels with reduced diameter may be formed.

Continuing to refer to Figures 7 and 8, a spoiler 218 is formed on the inner wall of the second-stage diameter-reducing tapered channel 219b. In one or more embodiments, the spoiler 218 is at least one spoiler rib extending longitudinally along the inner wall of the tapered channel of this stage of diameter reduction, such as a plurality of spoiler ribs. In an alternative embodiment, the spoiler 218 can be at least one radial protrusion on the inner wall of the tapered channel of this stage of diameter reduction, such as one or more columnar protrusions. In an alternative embodiment, the spoiler 218 can also be formed on the inner wall of the first-stage diameter-reducing tapered channel 219b, or a spoiler is formed on the inner wall of each stage of diameter-reducing tapered channel.

As shown in Figures 7 and 8, the outer wall of the portion of the reduced diameter channel portion 219 corresponding to the second-stage reduced diameter tapered channel 219b is separated from the inner wall of the integrated nozzle 521, thereby forming an annular gap 300 between the outer wall and the inner wall of the integrated nozzle 521. The annular gap 300 helps to mix the air and the water flow, thereby generating more microbubbles.

As shown in Figures 7 and 8, two rows of multiple air inlets 216 arranged in a ring are formed on the outer wall of the integrated nozzle 521. These air inlets 216 are located close to the nozzle hole 217. The water flow enters from the inlet end 211, first flows through the first and second stage diameter-reduced tapered channels 219a, 219b and is pressurized step by step, and the spoiler 218 further increases the vortex of the water flow. The accelerated water flow is rapidly expanded and sprayed into the downstream channel of the integrated nozzle 521 from the nozzle hole 217, and a negative pressure is generated therein. Under the action of the negative pressure, a large amount of external air is sucked into the integrated nozzle 521 from the air inlet 216 along the direction E and mixed with the water flow therein to produce bubble water. In an alternative embodiment, more or less air inlets can be provided as needed, and can be arranged in other ways, such as in a staggered manner. The bubble water then flows to the micro-bubble bubbler 522.

As shown in Figures 7 and 8, the micro-bubble bubbler 522 includes a first-stage filter screen 221a and a second-stage filter screen 221b along the water flow direction C. The first-stage filter screen 221a and the second-stage filter screen 221b are arranged parallel to each other and spaced a predetermined distance apart. The number of filter screen layers of the first-stage filter screen 221a is less than the number of filter screen layers of the second-stage filter screen 221b. In one or more embodiments, the first-stage filter screen 221a has a layer of filter screen, and the second-stage filter screen 221b has two or three layers of filter screens. Alternatively, the first-stage filter screen 221a also has more than one layer of filter screen. After the bubble water is cut and mixed by the first-stage filter screen 221a, it is cut and mixed more finely by the second-stage filter screen 221b, thereby producing more and smaller diameter micro-bubbles. In an alternative embodiment, the micro-bubble bubbler may include more than two levels of filter screens to produce smaller diameter micro-bubbles.

In one or more embodiments, the first filter screen 221a and the second filter screen 221b both have at least one pore with a diameter of micrometer level. Preferably, the diameter of the pore is between 0 and 1000 micrometers; more preferably, the diameter of the pore is between 5 and 500 micrometers. The first filter screen 221a and the second filter screen 221b can be plastic fences, metal meshes, polymer meshes, or other suitable mesh structures. Plastic fences generally refer to polymer fences, which are integrally injection molded by polymer materials, or polymer materials are first made into plates, and then microporous structures are produced on the plates by machining to form plastic fences. Polymer material meshes generally refer to meshes with microporous structures that are first made into silk by polymer materials and then woven with the silk. Polymer material meshes can include nylon meshes, cotton nylon meshes, polyester meshes, polypropylene meshes, etc. Alternatively, the first filter screen 221a and the second filter screen 221b can be other mesh structures that can produce microbubbles, such as mesh structures composed of two non-micrometer honeycomb structures.

Fig. 9 is a perspective exploded view of the first embodiment of the micro-bubble nozzle of the present invention. As shown in Fig. 9, in this embodiment, the micro-bubble bubbler 522 includes a grid 225 for fixing the first-stage filter 221a and the second-stage filter 221b together and a fixing member 222 for fixing the grid 225 to the outlet end 212 of the integrated nozzle 521.

In one or more embodiments, the grid 225 is annular. As shown in Figures 7-8, the first-stage filter screen 221a and the second-stage filter screen 221b are respectively attached to the axial ends of the grid 225, and the specific attachment method includes but is not limited to secondary molding, bonding or cladding. In one or more embodiments, a plurality of overflow ports (or overflow holes) 226 are formed on the circumferential surface of the grid 225. When the flow rate of the jet water flow is relatively large, part of the water is allowed to overflow from these overflow ports 226, which can not only help clean the filter screen, but also prevent excess water from flowing back through the air intake port, resulting in the inability to inhale air through these air intake ports. When the flow rate of the jet water flow is relatively small, these overflow ports 226 can also act as auxiliary air intake ports for inhaling more air.

In one or more embodiments, the fixing member 222 is substantially cylindrical, having a first end having an inner diameter greater than the outer diameter of the outlet end 212 of the integral nozzle 521 and a second end having an opening inner diameter less than the inner diameter of the outlet end 212 of the integral nozzle 521. An internal thread (not shown) is formed on the inner wall of the first end, and the internal thread is capable of engaging with an external thread 212a formed on the outlet end 212 of the integral nozzle 521. When the fixing member 222 is fastened to the outlet end 212 of the integral nozzle 521, the mesh frame 225 together with the first-stage filter screen 221a and the second-stage filter screen 221b are pressed between the end surface of the outlet end 212 of the integral nozzle 521 and the inner end surface of the second end of the fixing member 222.

Optionally, a plurality of overflow ports (or overflow holes) 223 are provided on the periphery of the fixing member 222, and these overflow ports are positioned near the second end of the fixing member 222. When the bubble water cannot pass through the first-stage filter screen 221a and/or the second-stage filter screen 221b in time, the excess bubble water can flow out from the overflow port 223, thereby preventing the excess water from flowing back and flooding the air intake port 216. Therefore, the overflow port 223 can prevent the situation where the air cannot be sucked into the integrated nozzle due to the air intake port being blocked, and thus micro bubble water cannot be generated. In alternative embodiments, more or fewer overflow ports 223 can be provided as needed.

Optionally, a preset gap may be reserved between the meshed external thread 212a and the internal thread of the fixing member 222 to allow air to be sucked into the integrated nozzle 521 through the gap. In alternative embodiments, the fixing member 222 may be connected to the outlet end 212 of the integrated nozzle 521 by other connection methods, such as snap-fit, screw connection, or welding.

Optionally, a connection portion 224 is provided on the periphery of the second-stage filter screen 221b. The grid frame 225 presses the connection portion 224 onto the inner end surface of the second end of the fixing member 222, thereby firmly fixing the second-stage filter screen 221b, so that the second-stage filter screen 221b will not fall off from the outlet end 212 of the integrated nozzle 521 when subjected to the impact of high-pressure water flow. The parts not mentioned in this embodiment are the same as those in the above embodiment.

FIG10 is a perspective exploded view of the second embodiment of the microbubble nozzle of the present invention. As shown in FIG10 , in this embodiment, a grid 225 combined with a first-stage filter 221a and a second-stage filter 221b is directly fixed to the outlet end 212 of the integrated nozzle 521. In one or more embodiments, a clamp arm 227 is provided on the axial end of the grid 225 facing the outlet end 212 of the integrated nozzle 521. Correspondingly, a clamping groove 212b is provided on the outlet end 212 of the integrated nozzle 521. By clamping the clamp arm 227 in the clamping groove 212b, the grid 225 is directly fixed to the outlet end 212, and no additional fixing parts are required. Alternatively, the grid 225 can also be fixed to the outlet end 212 of the integrated nozzle 521 by threaded connection or welding. Optionally, in this embodiment, a plurality of overflow ports (or overflow holes) 226 are formed on the circumferential surface of the grid 225. These overflow ports 226 can prevent the situation that the air cannot be sucked into the integrated nozzle due to the air inlet being blocked and thus the microbubble water cannot be produced. The parts not mentioned in this embodiment are the same as those in the above embodiment.

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 may combine the technical features from different embodiments, or 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 (9)

1. A micro-bubble nozzle, characterized in that the micro-bubble nozzle comprises an integrated nozzle and a micro-bubble bubbler fixed on the outlet end of the integrated nozzle, A tapered channel portion with a reduced diameter is provided in the integrated nozzle, at least one tapered channel with a reduced diameter is formed in the tapered channel portion along the water flow direction, and a spray hole is formed at the downstream end of the tapered channel portion with a reduced diameter, the spray hole being configured to generate a negative pressure in the integrated nozzle after the water flow pressurized by the at least one tapered channel with a reduced diameter is sprayed out from the spray hole; The integrated nozzle is provided with an air inlet, the air inlet being positioned close to the nozzle hole so that air is sucked into the integrated nozzle through the air inlet by the negative pressure and mixed with the water flow to produce bubble water; and The micro-bubble bubbler includes at least two levels of filters spaced a predetermined distance apart from each other along the water flow direction to convert the bubble water into micro-bubble water. The microbubble generator includes a grid frame to fix the at least two-stage filter screens together, and a plurality of overflow ports are formed on a circumferential surface of the grid frame. 2 . The micro-bubble nozzle according to claim 1 , wherein the at least one level of tapered channel with a decreasing diameter comprises a first level of tapered channel with a decreasing diameter and a second level of tapered channel with a decreasing diameter. 3 . The micro bubble nozzle according to claim 1 , wherein a flow disturbance portion is formed on the inner wall of the tapered channel portion with a decreasing diameter. 4. The micro-bubble nozzle according to claim 1 or 2, characterized in that the diameter of the nozzle hole is in the range of 0-6 mm. 5. The microbubble nozzle according to claim 1 or 2, characterized in that the at least two-stage filter screen comprises a first-stage filter screen and a second-stage filter screen, the first-stage filter screen comprises at least one layer of filter screen, and the number of layers of the first-stage filter screen is less than the number of layers of the second-stage filter screen. 6 . The micro-bubble nozzle according to claim 1 , wherein the grid is directly fixed on the outlet end of the integrated nozzle. 7 . The micro-bubble nozzle according to claim 1 , wherein the micro-bubble bubbler further comprises a fixing member and the grid is fixed to the outlet end of the integrated nozzle through the fixing member. 8. The micro bubble nozzle according to claim 7, characterized in that an overflow port is provided on the fixing member. 9. A washing device, characterized in that the washing device comprises the micro-bubble nozzle according to any one of claims 1 to 8, and the micro-bubble nozzle is configured to generate micro-bubble water in the washing device.