Micro bubble nozzle and washing equipment having the same

Abstract

The present invention relates to a micro-bubble nozzle and a washing device having the micro-bubble nozzle. The micro-bubble nozzle comprises a water inlet pipe component and a water outlet pipe component, wherein the water inlet pipe component has a water inlet end and a first connecting end having a first joint; the water outlet pipe component has a first connecting end having a second joint and a water outlet end including a bubbler, and in an assembled state, the first joint and the second joint are engaged with each other and form a first axial gap therebetween, a second radial gap is formed between the surfaces where the first connecting end and the second connecting end abut against each other, the first axial gap is connected to the second radial gap to form an air inlet channel, the outlet of the air inlet channel is close to the minimum diameter opening, the water flow accelerated by the at least one first diameter reducing conical portion forms a negative pressure near the outlet of the air inlet channel through the minimum diameter opening to suck air into the water outlet pipe component and mix with water to generate bubble water, and micro-bubble water is formed when the bubble water flows through the bubbler.

Description

Technical Field

[0001] 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 Art

[0002] Microbubbles usually refer to tiny bubbles with a diameter of less than fifty 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. 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, microbubbles carry negative charges and easily absorb positively charged foreign matter floating in the liquid. Therefore, after the foreign matter is destroyed due to the breaking of microbubbles, it will be absorbed by 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 equipment such as washing machines.

[0003] 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 an outer shell with two ends being open, a water inlet pipe is connected to the first end of the outer shell, and a vortex column, a vortex column shell, a gas-liquid mixing tube and a mesh positioned at the second end of the outer shell are sequentially arranged along the water flow direction in the outer 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 flow into 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 the air and water flow mix and then enter 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 network through the circulation part, and the bubble water is cut and mixed by the fine holes in the hole network to produce microbubble water containing a large number of microbubbles.

[0004] 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 being 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 being 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 portion, and an expansion guide portion 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 whose size gradually decreases along the direction from the first end to the second end is formed in the gas-liquid mixing portion; and an expansion guide space whose size increases along the direction from the first end to the second end is formed in the expansion guide portion. An air inlet channel is provided on the tube wall of the bubble generating pipe, and a gap is formed between the inner wall of the gas-liquid mixing portion and the outer wall of the boosting pipe so as to communicate with the air inlet channel on the outer wall of the bubble generating pipe, and the water outlet of the boosting pipe is placed in the water inlet of the gas-liquid mixing portion. The water flows through the boosting 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 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.

[0005] 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 supercharging 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 be guaranteed to work reliably. In addition, in order to allow air to be sucked into the microbubble generator from the outside, an air channel needs to be provided on the housing and the gas-liquid mixing pipe or the bubble generating pipe. Therefore, the components and structures of such a microbubble generator are relatively complicated, and the manufacturing cost is also very high.

[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 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 comprising: a water inlet pipe component, the water inlet pipe component having a water inlet end and a first connecting end for allowing water to flow in, the first connecting end having a first joint portion, and at least one first-stage diameter-reducing tapered portion is provided in the first connecting end along the water flow direction, and a minimum diameter opening is formed at the top of the at least one first-stage diameter-reducing tapered portion; a water outlet pipe component, the water outlet pipe component having a second connecting end and a water outlet end, the second connecting end being provided with a second joint portion, and in a state where the water inlet pipe component and the water outlet pipe component are assembled, the first joint portion The first connection part and the second connection part are engaged with each other, a first axial gap is formed between the first connection part and the second connection part, and a second radial gap is formed between the surfaces abutting against each other of the first connection end and the second connection end, the first axial gap and the second radial gap are connected to each other to form an air inlet channel, the outlet of the air inlet channel is close to the minimum diameter opening so that when water flows through the minimum diameter opening, negative pressure is formed near the outlet of the air inlet channel and thus the outside air is sucked into the water outlet pipe part to mix with the water to produce bubble water; and a bubbler, the bubbler is fixed to the water outlet end of the water outlet pipe part and has a mesh structure, and the mesh structure is configured to form micro bubble water when the bubble water flows through it.

[0008] In the preferred technical solution of the above-mentioned microbubble nozzle, the at least one first-level diameter decreasing cone portion includes a first-level diameter decreasing cone portion and a second-level diameter decreasing cone portion, the minimum diameter of the first-level diameter decreasing cone portion is equal to the maximum diameter of the second-level diameter decreasing cone portion, and the minimum diameter opening is formed at the top of the second-level diameter decreasing cone portion.

[0009] In a preferred technical solution of the above-mentioned micro-bubble nozzle, the micro-bubble nozzle has an insertion portion extending from the top into the water outlet pipe component around the minimum diameter opening.

[0010] In the preferred technical solution of the above-mentioned microbubble nozzle, the first joint portion is an internal threaded hole wall arranged in the first connecting end, and the second joint portion is an external threaded cylinder arranged on the second connecting end; or, the first joint portion is an external threaded cylinder arranged on the first connecting end, and the second joint portion is an internal threaded hole wall arranged in the second connecting end; the first axial gap is formed between the internal threaded hole wall and the external threaded cylinder.

[0011] In the preferred technical solution of the above-mentioned microbubble nozzle, the first joint portion is a smooth hole wall arranged in the first connecting end, the second joint portion is a non-smooth cylindrical surface arranged on the second connecting end, a plurality of ridges or grooves are arranged on the non-smooth cylindrical surface, and the first axial gap is formed between the smooth hole wall and the non-smooth cylindrical surface.

[0012] In the preferred technical solution of the above-mentioned microbubble nozzle, the first joint portion is a non-smooth hole wall arranged in the first connecting end, and a plurality of ridges or grooves are arranged on the non-smooth hole wall; the second joint portion is a smooth cylindrical surface arranged on the second connecting end; and the first axial gap is formed between the non-smooth hole wall and the smooth cylindrical surface.

[0013] In the preferred technical solution of the above-mentioned microbubble nozzle, the first joint portion is a non-smooth hole wall arranged in the first connecting end, and a plurality of ridges and / or grooves are arranged on the non-smooth hole wall; the second joint portion is a non-smooth cylinder arranged on the second connecting end, and a plurality of ridges and / or grooves are arranged on the non-smooth cylinder; the first axial gap is formed between the non-smooth hole wall and the non-smooth cylinder.

[0014] In the preferred technical solution of the above-mentioned micro-bubble nozzle, the mesh structure includes a plastic fence, a metal mesh, or a polymer material mesh.

[0015] In the preferred technical solution of the above-mentioned micro-bubble nozzle, the hole diameter of the hole network structure ranges from 0 to 1000 microns.

[0016] Those skilled in the art can understand that, in the technical solution of the present invention, the microbubble nozzle includes a water inlet pipe component having at least one tapered portion with a reduced diameter inside and a water outlet pipe component having a bubbler at the water outlet end, a minimum diameter opening is provided at the top of the at least one tapered portion with a reduced diameter to connect the water inlet pipe component with the water outlet pipe component, and the air inlet channel is composed of a first axial gap and a second radial gap that are connected to each other: the first axial gap is formed between a first joint portion of the first connecting end of the water inlet pipe component and a second joint portion of the second connecting end of the water outlet pipe component; the second radial gap is formed between the surfaces against which the first connecting end and the second connecting end are abutted. Water flows into the water inlet pipe component from the water inlet end of the water inlet pipe component; the water flow is accelerated in at least one first-level tapered portion where the diameter decreases; the accelerated water flow is expanded and sprayed into the water outlet pipe component from the minimum diameter opening, generating negative pressure in the second connecting end, under the action of the negative pressure, a large amount of air is sucked into the water outlet pipe component from the outside through the first axial gap and the second radial gap and mixed with water to generate bubble water containing a large number of bubbles; the bubble water finally flows through the bubbler located at the water outlet end of the water outlet pipe component to generate micro bubble water containing a large number of micro bubbles. In the technical solution of the present invention, it is only necessary to combine the first connecting end of the water inlet pipe component and the second connecting end of the water outlet pipe component to form a micro bubble nozzle, so the micro bubble nozzle can be regarded as a two-component micro bubble nozzle. Furthermore, the air inlet channel is combined between the joint of the water inlet pipe component and the water outlet pipe component, so there is no need to separately set an air inlet channel at other parts of the micro bubble nozzle. Compared with the prior art, the micro-bubble nozzle of the present invention not only has good performance in generating micro-bubbles, but also has greatly simplified components and structures, so that its manufacturing cost is also significantly reduced.

[0017] Preferably, the first joint of the first connection end of the water inlet pipe component is an internal threaded hole wall, and the second joint of the second connection end of the water outlet pipe component is an external threaded cylinder meshing with the internal threaded hole wall, or the first joint of the first connection end is an external threaded cylinder, and the second joint of the second connection end is an internal threaded hole wall meshing with the external threaded cylinder. In this way, the first axial gap is formed by the gap reserved between the meshing threads, forming a part of the air inlet passage. Alternatively, the first joint is a smooth hole wall, and the second joint is a non-smooth cylinder with multiple ridges or grooves arranged thereon that matches the smooth hole wall; or the first joint is a non-smooth hole wall with multiple ridges or grooves arranged thereon, and the second joint is a smooth cylinder matching the non-smooth hole wall; or the first joint is a non-smooth hole wall with multiple ridges or grooves arranged thereon, and the second joint is a non-smooth cylinder matching the smooth hole wall with multiple ridges or grooves arranged thereon. The matching structure between the joints is not limited to the above structure, and can be any matching structure of "ridge + groove", "ridge + ridge", or "groove + groove", as long as these matching joint structures can achieve the purpose of forming a first axial gap between the first joint and the second joint.

[0018] 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

[0019] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0020] Figure 1 It is a structural schematic diagram of an embodiment of a washing device with a micro-bubble nozzle of the present invention;

[0021] Figure 2 It is a three-dimensional schematic diagram of an embodiment of the micro-bubble nozzle of the present invention;

[0022] Figure 3 yes Figure 2 A front view of an embodiment of a micro-bubble nozzle of the present invention is shown;

[0023] Figure 4 yes Figure 2 A top view of an embodiment of a micro bubble nozzle of the present invention is shown;

[0024] Figure 5 It is along Figure 4A cross-sectional view of an embodiment of the micro-bubble nozzle of the present invention taken along the cross-sectional line EE;

[0025] Figure 6 It is along Figure 4 A cross-sectional view of another embodiment of the microbubble nozzle of the present invention taken along section line EE.

[0026] List of reference numerals:

[0027] 11. Box body; 12. Plate base; 13. Upper cover; 14. Foot; 21. Outer barrel; 31. Inner barrel; 311. Dehydration hole; 32. Impeller; 33. Transmission shaft; 34. Motor; 35. Balance ring; 41. Drain valve; 42. Drain pipe; 51. Inlet valve; 52. Micro bubble nozzle; 521. Inlet pipe component; 522. Outlet pipe component; 523. Bubble generator; 524A. First fixed installation part; 524B. Second fixed installation part Mounting portion; 525, first axial gap; 526, second radial gap; 211, water inlet end; 212, first connecting end; 213, first joint portion; 214, first cylindrical portion; 215, second cylindrical portion; 216, first-stage diameter-reducing tapered portion; 217, second-stage diameter-reducing tapered portion; 218, minimum diameter opening; 219, insertion portion; 221, second connecting end; 222, second joint portion; 223, water outlet end. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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 inlet pipe component and an outlet pipe component. The inlet pipe component has an inlet end and a first connection end for allowing water to flow in, and the first connection end is provided with a first joint. At least one first-stage diameter-reducing tapered portion arranged along the water flow direction is also provided in the first connection end of the inlet pipe component, and a minimum diameter opening is formed at the top of the at least one first-stage diameter-reducing tapered portion. The outlet pipe component has a second connection end and a water outlet end, and the second connection end is provided with a second joint, and a bubbler is fixed at the water outlet end. The bubbler has a mesh structure, and the mesh structure is configured to form microbubble water when bubble water flows through it. When the inlet pipe component and the outlet pipe component are assembled, the first joint and the second joint are engaged with each other, a first axial gap is formed between the first joint and the second joint, and a second radial gap is formed between the surfaces where the first connection end and the second connection end abut against each other, and the first axial gap and the second radial gap are connected to each other to form an air inlet channel. The outlet of the air inlet channel is close to the minimum diameter opening so that when water is sprayed out from the minimum diameter opening, a negative pressure is formed near the outlet of the air inlet channel and the outside air is sucked into the water outlet pipe component so that the air and water are mixed to produce bubble water. The bubble water is cut and mixed when it flows through the bubbler, thereby producing microbubble water containing a large number of microbubbles. The air inlet channel is directly formed between the first joint of the first connecting end and the second joint of the second connecting end and between the abutting surfaces of the first connecting end and the second connecting end, and a microbubble nozzle can be formed by combining the first connecting end of the water inlet pipe component and the second connecting end of the water outlet pipe component. Therefore, compared with the microbubble generator of the prior art, the number of components and the structure of the microbubble nozzle of the present invention are greatly simplified, and the manufacturing cost of the microbubble nozzle is also greatly reduced, while the microbubble nozzle still maintains a good performance of generating microbubbles.

[0032] 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.

[0033] Therefore, the present invention also provides a washing device, which includes the microbubble nozzle of the present invention. 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, 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 benefiting the health of users.

[0034] Reference Figure 1 , Figure 11 is a schematic diagram of the structure 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. Alternatively, in other embodiments, the washing device may be a drum washing machine or a drying machine.

[0035] like 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 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, 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, the motor 34 is connected to the pulsator 32 through a transmission shaft 33, and 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.

[0036] Reference Figure 2-Figure 4 , Figure 2 is a three-dimensional schematic diagram of an embodiment of the micro-bubble nozzle of the present invention, Figure 3 yes Figure 2 A front view of an embodiment of the micro bubble nozzle of the present invention is shown. Figure 4 yes Figure 2 A top view of an embodiment of the micro bubble nozzle of the present invention is shown. Figure 2-4 As shown, as an embodiment, the micro-bubble nozzle 52 of the present invention includes a water inlet pipe component 521 and a water outlet pipe component 522. A bubbler 523 is installed at one end of the water outlet pipe component 522. The bubbler 523 is a mesh structure and is configured to form micro-bubble water when bubble water flows through.

[0037] Optionally, the mesh structure of the bubbler 523 has 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 mesh structure of the bubbler 523 can be a plastic fence, a metal mesh, a polymer mesh, or other suitable mesh structures. The plastic fence generally refers to a polymer fence, which is integrally injection molded by a polymer material, or a polymer material is first made into a plate, and then a microporous structure is produced on the plate by machining to form a plastic fence. The polymer mesh generally refers to a mesh with a microporous structure that is made by first making a polymer material into a wire and then weaving the wire. The polymer mesh can include a nylon mesh, a cotton mesh, a polyester mesh, a polypropylene mesh, etc. Alternatively, the bubbler 523 can be other mesh structures that can generate microbubbles, such as a mesh structure composed of two non-micrometer-level honeycomb structures.

[0038] Optionally, a first fixed installation portion 524A and a second fixed installation portion 524B are provided on the water inlet pipe component 521 .

[0039] Reference Figure 3 and Figure 4 The first fixed installation part 524A and the second fixed installation part 524B are symmetrically positioned on both sides of the outer wall of the water inlet pipe component 521 and are located in the middle of the micro-bubble nozzle 52, and are used to fix the micro-bubble nozzle 52 to a predetermined installation position. Optionally, the first and second fixed installation parts 524A, 524B can be arranged on the water outlet pipe component 522, or only one fixed installation part is arranged on the micro-bubble nozzle 52.

[0040] like Figure 4 As shown, in one embodiment, the first and second fixing and mounting portions 524A, 524B are screw hole structures. However, the fixing and mounting portions may adopt any suitable connection structure, such as a snap connection structure, a welding connection structure, etc.

[0041] Reference Figure 5 , Figure 5 It is along Figure 4 A cross-sectional view of an embodiment of the micro-bubble nozzle of the present invention taken along the section line EE. Figure 5 As shown, the micro bubble nozzle 52 includes a water inlet pipe component 521 and a water outlet pipe component 522 .

[0042] like Figure 5As shown, the water inlet pipe component 521 has a water inlet end 211 for allowing water to flow in and a first connection end 212 for allowing water to flow out of the water inlet pipe component 521. A first cylindrical portion 214, a second cylindrical portion 215, a first-stage diameter-reducing tapered portion 216, a second-stage diameter-reducing tapered portion 217, and a minimum diameter opening 218 are sequentially formed in the water inlet pipe component 521 along the water flow direction C. The first cylindrical portion 214 extends from the water inlet end 211 to the second cylindrical portion 215, and the inner diameter of the first cylindrical portion 214 is greater than the inner diameter of the second cylindrical portion 215. The second cylindrical portion 215 extends along the water flow direction C to the first-stage diameter-reducing tapered portion 216, and the inner diameter of the second cylindrical portion 215 is equal to the maximum inner diameter of the first-stage diameter-reducing tapered portion 216. The first-stage tapered diameter portion 216 extends to the second-stage tapered diameter portion 217 along the water flow direction C, and the minimum inner diameter of the first-stage tapered diameter portion 216 is equal to the maximum inner diameter of the second-stage tapered diameter portion 217. The minimum diameter opening 218 is formed at the top of the second-stage tapered diameter portion 217, connecting the water inlet pipe component 521 with the water outlet pipe component 522. The first-stage tapered diameter portion 216 and the second-stage tapered diameter portion 217 are positioned in the first connecting end 212. A first engaging portion 213 is also formed in the first connecting end 212, which is located downstream of the minimum diameter opening 218 and takes the form of an internal threaded hole wall.

[0043] Continue to refer to Figure 5 , the water outlet pipe component 522 has a second connection end 221 and a water outlet end 223. Along the water flow direction C, the second connection end 221 is located upstream of the water outlet end 223. A second joint portion 222 is provided on the second connection end 221, and the second joint portion 222 is an external threaded cylinder, so that the external thread can be engaged with the internal thread of the first joint portion 213. A bubbler 523 capable of generating microbubbles is fixed at the water outlet end 223. The bubbler 523 can be any mesh structure suitable for generating microbubbles, such as listed in the above embodiments.

[0044] like Figure 5 As shown, when the water inlet pipe component 521 and the water outlet pipe component 522 are assembled, the internal thread of the first joint portion 213 and the external thread of the second joint portion 222 are meshed with each other, and the end surface of the second connection end 221 abuts against the radial abutment surface formed in the first connection end 212. The radial abutment surface is flush with the top plane of the second-stage tapered portion 217 facing the water outlet pipe component 522. A first axial gap 525 (such as Figure 5 The second radial gap 526 is formed between the end surface of the second connecting end 221 and the abutting surface in the first connecting end 212 (as shown by the arrow pointing to the water inlet pipe component 521). Figure 5As shown by the radial arrow in the middle). The first axial gap 525 and the second radial gap 526 are connected to each other to form an air inlet channel, the outlet of which is close to the minimum diameter opening 218 and is located between the top of the second-stage diameter-decreasing tapered portion 217 and the second connecting end 212. After entering the water inlet pipe component 521, the water flows through the first cylindrical portion 214, the second cylindrical portion 215, the first-stage diameter-decreasing tapered portion 216 and the second-stage diameter-decreasing tapered portion 217 in sequence. The second cylindrical portion 215, the first-stage diameter-decreasing tapered portion 216 and the second-stage diameter-decreasing tapered portion 217 are respectively used to increase the speed of the water flow. The accelerated water is expanded and sprayed into the water outlet pipe component 522 through the minimum diameter opening 218, thereby forming a negative pressure near the outlet of the air inlet channel; a large amount of external air is sucked into the water outlet pipe component 522 through the first axial gap 525 and the second radial gap 526 under the action of negative pressure and mixed with water to produce bubble water. The bubble water then flows through the bubbler 523 and is cut and mixed by the bubbler 523 to produce micro-bubble water containing a large number of micro-bubbles.

[0045] Alternatively, a first-stage tapered portion with a reduced diameter is provided in the water inlet pipe component 521, and the minimum diameter opening is formed at the top of the first-stage tapered portion with a reduced diameter; or three or more stages of tapered portions with a reduced diameter are formed in the water inlet pipe component 521, and the minimum diameter opening is formed at the top of the first-stage tapered portion with a reduced diameter located at the most downstream in the water flow direction. In addition, the first cylindrical portion 214 and the second cylindrical portion 215 may be replaced by a single cylindrical portion.

[0046] Optionally, the first engaging portion 213 of the first connecting end 212 is set to an external threaded cylinder, and the second engaging portion 222 of the second connecting end 221 is set to an internal threaded hole wall (not shown in the figure) matching the external threaded cylinder. An abutment surface is formed in the second connecting end 221. When the water inlet pipe component 521 and the water outlet pipe component 522 are assembled, the external thread of the first engaging portion 213 of the first connecting end 212 meshes with the internal thread of the second engaging portion 222 of the second connecting end 221, and the end face of the first connecting end 212 abuts against the abutment surface in the second connecting end 221. The first axial gap is formed between the meshed external thread and internal thread, and the second radial gap is formed between the end face and the abutment surface abutting against each other.

[0047] Optionally, the first engaging portion 213 is a smooth hole wall disposed in the first connecting end 212, and the second engaging portion 222 is a non-smooth cylindrical surface disposed on the second connecting end 221, and the non-smooth cylindrical surface is provided with a plurality of ridges or grooves (not shown in the figure). The first axial gap is formed between the smooth hole wall and the non-smooth cylindrical surface.

[0048] Optionally, the first engaging portion 213 is a non-smooth hole wall disposed in the first connecting end 212, and a plurality of ridges or grooves are disposed on the non-smooth hole wall, and the second engaging portion 222 is a smooth cylindrical surface (not shown in the figure) disposed on the second connecting end 221. The first axial gap is formed between the non-smooth hole wall and the smooth cylindrical surface.

[0049] Optionally, the first joint portion 213 is a non-smooth hole wall provided in the first connection end 213, and a plurality of ridges and / or grooves are provided on the non-smooth hole wall, and the second joint portion 222 is a non-smooth cylinder provided on the second connection end, and a plurality of ridges and / or grooves are provided on the non-smooth cylinder (not shown in the figure). The first axial gap is formed between the non-smooth hole wall and the non-smooth cylinder.

[0050] The matching structure of the first joint portion and the second joint portion of the microbubble nozzle of the present invention is not limited to the structures specifically listed above. For example, the matching structure can be a "convex rib + convex rib" structure, a "groove + groove" structure, a "convex rib + groove" structure, or other suitable matching structures that can form a reserved gap.

[0051] Reference Figure 6 , Figure 6 It is along Figure 4 A cross-sectional view of another embodiment of the micro-bubble nozzle of the present invention taken along the cross-sectional line EE. Figure 6 As shown, an insert portion 219 is formed on the top of the second-stage tapered portion 217 where the diameter decreases. The insert portion 219 extends into the second connection end 221 downstream around the minimum diameter opening 218. The outer peripheral surface of the insert portion 219 is a tapered surface that gradually shrinks along the water flow direction C. The insert portion 219 configured in this way can not only guide the flow of water, but also prevent the water flow ejected from the minimum diameter opening 218 from entering the second radial gap 526 and the first axial gap 525 from the outlet of the air inlet channel and then flowing to the outside of the micro-bubble nozzle. The other unmentioned parts of this embodiment are the same as the aforementioned embodiment.

[0052] 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

1. A micro bubble nozzle, characterized in that: include: A water inlet pipe component, the water inlet pipe component having a water inlet end allowing water to flow in and a first connection end, the first connection end having a first joint portion, and at least one first-stage diameter-decreasing tapered portion is provided in the first connection end along the water flow direction, and a minimum diameter opening is formed at the top of the at least one first-stage diameter-decreasing tapered portion; a water outlet pipe component, the water outlet pipe component having a second connection end and a water outlet end, the second connection end being provided with a second joint portion, the first joint portion and the second joint portion being engaged with each other when the water inlet pipe component and the water outlet pipe component are assembled, a first axial gap is formed between the first joint portion and the second joint portion, and a second radial gap is formed between surfaces abutting against the first connection end and the second connection end, the first axial gap and the second radial gap are connected to each other to form an air inlet passage, the outlet of the air inlet passage is close to the minimum diameter opening so that when water flows through the minimum diameter opening, negative pressure is formed near the outlet of the air inlet passage and thus outside air is sucked into the water outlet pipe component to mix with water to generate bubble water; as well as The bubbler is fixed to the water outlet end of the water outlet pipe component and has a mesh structure, and the mesh structure is configured to form micro bubble water when the bubble water flows through it.

2. The micro bubble nozzle according to claim 1, characterized in that: The at least one first-stage tapered diameter portion includes a first-stage tapered diameter portion and a second-stage tapered diameter portion, the minimum diameter of the first-stage tapered diameter portion is equal to the maximum diameter of the second-stage tapered diameter portion, and the minimum diameter opening is formed at the top of the second-stage tapered diameter portion.

3. The micro bubble nozzle according to claim 1, characterized in that: The micro bubble nozzle has an insertion portion extending from the top into the water outlet pipe component around the minimum diameter opening.

4. The micro bubble nozzle according to any one of claims 1 to 3, characterized in that: The first engaging portion is an internal threaded hole wall arranged in the first connecting end, and the second engaging portion is an external threaded cylindrical surface arranged on the second connecting end; or, the first engaging portion is an external threaded cylindrical surface arranged on the first connecting end, and the second engaging portion is an internal threaded hole wall arranged in the second connecting end; the first axial gap is formed between the internal threaded hole wall and the external threaded cylindrical surface.

5. The micro bubble nozzle according to any one of claims 1 to 3, characterized in that: The first joint portion is a smooth hole wall arranged in the first connecting end, the second joint portion is a non-smooth cylindrical surface arranged on the second connecting end, a plurality of ridges or grooves are arranged on the non-smooth cylindrical surface, and the first axial gap is formed between the smooth hole wall and the non-smooth cylindrical surface.

6. The micro bubble nozzle according to any one of claims 1 to 3, characterized in that: The first joint portion is a non-smooth hole wall arranged in the first connecting end, and a plurality of ridges or grooves are arranged on the non-smooth hole wall. The second joint portion is a smooth cylindrical surface arranged on the second connecting end, and the first axial gap is formed between the non-smooth hole wall and the smooth cylindrical surface.

7. The micro bubble nozzle according to any one of claims 1 to 3, characterized in that: The first joint portion is a non-smooth hole wall arranged in the first connecting end, and a plurality of ridges and / or grooves are arranged on the non-smooth hole wall. The second joint portion is a non-smooth cylindrical surface arranged on the second connecting end, and a plurality of ridges and / or grooves are arranged on the non-smooth cylindrical surface. The first axial gap is formed between the non-smooth hole wall and the non-smooth cylindrical surface.

8. The micro bubble nozzle according to any one of claims 1 to 3, characterized in that: The mesh structure includes a plastic fence, a metal mesh, or a polymer material mesh.

9. The micro bubble nozzle according to any one of claims 1 to 3, characterized in that: The pore diameter of the pore network structure ranges from 0 to 1000 microns.

10. A washing device, characterized in that: The washing device comprises a micro-bubble nozzle according to any one of claims 1 to 9, and the micro-bubble nozzle is configured to generate micro-bubble water in the washing device.

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