Patent Description:
The present disclosure relates to a micro-bubble generation device, and specifically relate to a micro-bubble spray head and a washing apparatus having the micro-bubble spray head.

Micro-bubbles usually refer to tiny bubbles with a diameter below <NUM> micrometers (µm) during bubbles generation. Micro-bubbles may also be called micro-/nano-bubbles, micron-bubbles or nano-bubbles depending on their ranges of diameter. Due to their low buoyancy in a liquid, micro-bubbles stay for a longer time in the liquid. Furthermore, the micro-bubbles will shrink in the liquid until they finally break up, generating smaller nano-bubbles. In this process, a rising speed of the bubbles becomes slow since the bubbles become smaller, thus resulting in a high melting efficiency. When the micro-bubbles break up, high-pressure and high-temperature heat is locally generated, thereby destroying foreign objects such as organic matters floating in the liquid or adhering to objects. In addition, the shrinkage process of micro-bubbles is also accompanied by an increase in negative charges. A peak state of negative charges usually occurs when the diameter of the micro-bubbles is <NUM>-<NUM> microns, so it is easy for them to adsorb positively charged foreign matters floating in the liquid. The result is that the foreign matters are adsorbed by the micro-bubbles after they are destroyed due to the breaking up of the micro-bubbles, and then slowly float to a surface of the liquid. These properties enable the micro-bubbles to have extremely strong cleaning and purifying abilities. At present, micro-bubbles have been widely used in washing apparatuses such as clothing washing machines.

In order to produce micro-bubbles, micro-bubble generation devices of different structures have been developed. For example, Chinese patent application for invention (<CIT>) discloses a micro-bubble generator. The micro-bubble generator includes a shell with two open ends; a water inflow pipe is connected to a first end of the shell, and a vortex column, a vortex column shell, a gas-liquid mixing pipe and a hole mesh positioned at a second end of the shell are arranged in sequence inside the shell in a water flow direction. The gas-liquid mixing pipe is sequentially formed with an accommodation cavity, an air flow part, an acceleration part and a circulation part that communicate with each other from head to tail. The vortex column shell and the vortex column located in the vortex column shell are positioned in the accommodation cavity; an air inlet is provided on a pipe wall of the air flow part; an inner wall of the air flow part protrudes toward the direction of the accommodation cavity, forming a funnel-shaped protruding part; a slit is formed between a large mouth end of the funnel-shaped protruding part and the conical vortex column shell so that the air entering from the air inlet can enter the air flow part; an inner diameter of the acceleration part gradually increases toward the direction of the tail. A water flow flows through the vortex column to form a high-speed rotating water flow inside the vortex column shell, and the high-speed rotating water flow flows out from an outlet of the vortex column shell and then enters a funnel-shaped space enclosed by the protruding part. Air is sucked in from the air inlet by a negative pressure formed around the water flow and mixed with the water flow before entering the acceleration part. Because of a conical surface of the vortex column shell and a pressure difference formed due to the inner diameter of the acceleration part gradually increasing toward the direction of the tail, the water flow mixed with a large amount of air (forming bubble water) flows in an accelerated state, and the bubble water flows to the hole mesh through the circulation part. The bubble water is cut and mixed by fine holes in the hole mesh to produce micro-bubble water containing a large number of micro-bubbles. US patent application <CIT> provides a water purification apparatus with a similar micro-bubble spray head, which achieves reduction in the air bubble size and increases the amount of oxygen dissolution.

Chinese patent application for invention (<CIT>) also discloses a micro-bubble generator. The micro-bubble generator includes a shell with two open ends; a water inflow pipe is connected to a first end of the shell, and a pressurizing pipe, a bubble generation pipe and a hole mesh positioned at a second end of the shell are arranged in sequence inside the shell in a water flow direction. From a first end to a second end, the bubble generation pipe is sequentially formed with an accommodation cavity, a gas-liquid mixing part, and an expansion and guide part. The pressurizing pipe is received in the accommodation cavity, and the pressurizing pipe has a conical end facing the accommodation cavity; in the gas-liquid mixing part, a conical gas-liquid mixing space whose size gradually decreases in a direction from the first end to the second end is formed; and an expansion and guide space whose size increases in the direction from the first end to the second end is formed in the expansion and guide part. An air inflow passage is formed on a pipe wall of the bubble generation pipe, a gap is formed between an inner wall of the gas-liquid mixing part and an outer wall of the pressurizing pipe so as to communicate with the air inflow passage on the pipe wall of the bubble generation pipe, and a water outlet of the pressurizing pipe is arranged in a water inlet of the gas-liquid mixing part. The water flow flows through the pressurizing pipe and is pressurized to form a high-speed water flow. The high-speed water flow flows out from the water outlet of the pressurizing pipe and then enters the gas-liquid mixing cavity to form a negative pressure in the gas-liquid mixing cavity. The negative pressure sucks a large amount of air into the water flow through the air inflow passage and enables the air and water to mix with each other to form bubble water. The bubble water flows from the expansion and guide part to the hole mesh, and the bubble water is mixed and cut by the fine holes of the hole mesh to form micro-bubble water.

The above two kinds of micro-bubble generators each have at least five independent components: a shell, a water inflow pipe, a vortex column and a vortex column shell or a pressurizing pipe, a gas-liquid mixing pipe or a bubble generation pipe, and a hole mesh. These components all need to be designed with specific mating or connection structures so that all these components can be assembled together and the assembled micro-bubble generator can work reliably. Therefore, the components and structures of such micro-bubble generators are relatively complicated, and the manufacturing cost is also high.

<CIT> discloses a spray head according to the preamble of claim <NUM>.

Accordingly, there is a need in the art for a new technical solution to solve the above problem.

In order to solve the above problem in the prior art, that is, to solve the technical problem that existing micro-bubble generators have a complicated structure and the manufacturing cost is high, the present disclosure is set out in the appended set of claims.

It can be understood by those skilled in the art that in the technical solutions of the present disclosure, the micro-bubble spray head includes a one-piece spray pipe and a micro-bubble filter screen bag fixed inside an outlet end of the one-piece spray pipe. A Venturi tube structure is formed in the one-piece spray pipe, and a suction port is provided on the one-piece spray pipe, so that a large amount of outside air can be sucked into the one-piece spray pipe through the suction port by means of a negative pressure produced by the Venturi tube structure and mixes with a water flow in the one-piece spray pipe to produce bubble water. The micro-bubble filter screen bag includes an opening, a bottom and a side wall between the opening and the bottom. The opening faces the Venturi tube structure, and a water outflow space is formed between the side wall and an inner wall of the outlet end so as to allow the bubble water in the one-piece spray pipe to pass through the side wall and bottom of the micro-bubble filter screen bag to form micro-bubble water. Not only the bottom of the micro-bubble filter screen bag participates in mixing and cutting the bubble water, but also the side wall with a larger area participates in mixing and cutting the bubble water, so the yield of the micro-bubble water will be significantly increased. In the technical solutions of the micro-bubble spray head of the present disclosure, the function of generating a large amount of micro-bubble water containing a large number of micro-bubbles is realized by the Venturi tube structure designed in the one-piece spray pipe and the micro-bubble filter screen bag fixed inside the outlet end of the one-piece spray pipe. Therefore, as compared with the micro-bubble generators having many components in the prior art, the micro-bubble spray head of the present disclosure not only has very good performance of micro-bubble water generation, but also has the number of components thereof greatly reduced, thus also eliminating the need for designing and manufacturing connection structures between the components and significantly reducing the manufacturing cost of the entire micro-bubble spray head.

Preferably, the micro-bubble filter screen bag is formed by at least two layers of filter screens to ensure the generation of micro-bubbles with a smaller diameter.

Preferred embodiments of the present disclosure will be described below with reference to the accompanying drawings, in which:.

Preferred embodiments of the present disclosure will be 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 principle of the present disclosure, and are not intended to limit the scope of protection as defined by the appended claims.

It should be noted that in the description of the present disclosure, terms indicating directional or positional relationships, such as "upper", "lower", "left", "right", "inner", "outer" and the like, are based on the directional or positional relationships shown in the accompanying drawings. They are only used for ease of description, and do not indicate or imply that the device or element must have a specific orientation, or be constructed or operated in a specific orientation, and therefore they should not be considered as limitations to the present disclosure. In addition, terms "first" and "second" are only used for descriptive purposes, and should not be interpreted as indicating or implying relative importance.

In addition, it should also be noted that in the description of the present disclosure, unless otherwise clearly specified and defined, terms "install", "arrange" and "connect" should be understood in a broad sense; for example, the connection may be a fixed connection, or may also be a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection implemented through an intermediate medium, or it may be internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be interpreted according to specific situations.

In order to solve the problem that existing micro-bubble generators have a complicated structure and the manufacturing cost is high, the present disclosure provides a micro-bubble spray head. In the first embodiment, the micro-bubble spray head includes a one-piece spray pipe <NUM> and a micro-bubble filter screen bag <NUM> fixed inside an outlet end <NUM> of the one-piece spray pipe <NUM> (see <FIG>). A Venturi tube structure is provided in the one-piece spray pipe <NUM>, and a suction port <NUM> is provided on the one-piece spray pipe, so that air can be sucked into the one-piece spray pipe <NUM> through the suction port <NUM> by means of a negative pressure produced by the Venturi tube structure and mixes with a water flow in the one-piece spray pipe <NUM> to produce bubble water. The micro-bubble filter screen bag <NUM> includes an opening <NUM>, a bottom <NUM> and a side wall <NUM> located between the opening <NUM> and the bottom <NUM>. The opening <NUM> faces the Venturi tube structure, and a water outflow space <NUM> is formed between the side wall <NUM> and an inner wall 212a of the outlet end <NUM> so that the bubble water can pass through the side wall <NUM> and the bottom <NUM> to form micro-bubble water. Therefore, as compared with the micro-bubble generators in the prior art, both the number of components and the structure of the micro-bubble spray head of the present disclosure are greatly simplified, and the manufacturing cost of the micro-bubble spray head is also greatly reduced. At the same time, the micro-bubble spray head has very good performance of micro-bubble water generation.

In one or more examples, the Venturi tube structure can take many different forms, such as a diameter-decreased conical passage part <NUM> (shown in <FIG>). Alternatively, the Venturi tube structure includes, but is not limited to: a structure having a plurality of diameter-decreased conical passages parallel to each other in a water flow direction C; a structure having a single throttling hole in the water flow direction C; a structure having a plurality of throttling holes parallel to each other in the water flow direction C; a structure having a single passage whose diameter is first decreased and then increased in the water flow direction C; or a structure having a plurality of passages parallel to each other in the water flow direction C, whose diameter is first decreased and then increased (not shown in the figure).

The micro-bubble spray head of the present disclosure can be applied in the field of washing, the field of sterilization, or other fields that require micro-bubbles. For example, the micro-bubble spray head of the present disclosure can be applied not only to a washing apparatus, but also to devices such as bathroom faucets or showers.

Therefore, the present disclosure also provides a washing apparatus, which includes the micro-bubble spray head <NUM> of the present disclosure. The micro-bubble spray head <NUM> is configured to generate micro-bubble water in the washing apparatus. The micro-bubble water containing a large number of micro-bubbles is generated in the washing apparatus by the micro-bubble spray head <NUM>. The micro-bubble water can not only improve the washing ability of the washing apparatus, but also can reduce the amount of detergent used and a residual amount of detergent such as in the clothing, which is not only advantageous for the user's health, but also can improve the user experience.

Reference is made to <FIG>, which is a schematic structural view of an example of a washing apparatus including a micro-bubble spray head according to the present disclosure. In this example, the washing apparatus is a pulsator washing machine <NUM>. Alternatively, in other examples, the washing apparatus may be a drum washing machine or a washing-drying integrated machine, etc..

As shown in <FIG>, the pulsator washing machine <NUM> (hereinafter referred to as the washing machine) includes a cabinet <NUM>. Feet <NUM> are provided at a bottom of the cabinet <NUM>. An upper part of the cabinet <NUM> is provided with a tray <NUM>, and the tray <NUM> is pivotally connected with an upper cover <NUM>. An outer tub <NUM> serving as a water containing tub is provided inside the cabinet <NUM>. An inner tub <NUM> is arranged in the outer tub <NUM>, a pulsator <NUM> is arranged at a bottom of the inner tub <NUM>, and a motor <NUM> is fixed at a lower part of the outer tub <NUM>. The motor <NUM> is drivingly connected with the pulsator <NUM> through a transmission shaft <NUM>. A spin-drying hole <NUM> is provided on a side wall of the inner tub <NUM>. A drain valve <NUM> is provided on a drain pipe <NUM>, and an upstream end of the drain pipe <NUM> communicates with a bottom of the outer tub <NUM>. The washing machine further includes a water inflow valve <NUM> and a micro-bubble spray head <NUM> communicating with the water inflow valve <NUM>, and the micro-bubble spray head <NUM> is installed at a top of the outer tub <NUM>. Water enters the micro-bubble spray head <NUM> through the water inflow valve <NUM> to generate micro-bubble water containing a large number of micro-bubbles. The micro-bubble spray head <NUM> first sprays the micro-bubble water into a detergent box to mix with a detergent, and then the micro-bubble water enters the inner tub <NUM> through the detergent box for clothing washing. The micro-bubbles in the water impact the detergent during the breaking up process, and negative charges carried by the micro-bubbles can also adsorb the detergent, so the micro-bubbles can increase a mixing degree of the detergent and the water, thereby reducing the amount of detergent used and a residual amount of detergent in the clothing. In addition, the micro-bubbles in the inner tub <NUM> will also impact stains on the clothing, and will adsorb foreign matters that generate the stains. Therefore, the micro-bubbles also enhance a stain removal performance of the washing machine. Optionally, the micro-bubble spray head can also directly spray the micro-bubble water carrying a large number of micro-bubbles into the outer tub <NUM> or the inner tub <NUM> of the washing machine to further reduce the amount of detergent used and enhance the cleaning ability of the washing machine.

Reference is made to <FIG>, which is a schematic structural view of another example of the washing apparatus including the micro-bubble spray head according to the present disclosure. In this example, the washing apparatus is a drum washing machine <NUM>.

As shown in <FIG>, the drum washing machine <NUM> includes a shell <NUM> and feet <NUM> located at a bottom of the shell. A top panel <NUM> is provided at a top of the shell <NUM>. A front side of the shell <NUM> (an operation side facing the user) is provided with a door <NUM> that allows the user to put clothing and the like into the drum washing machine, and the door <NUM> is also provided with an observation window <NUM> for viewing an interior of the washing machine. A sealing window gasket <NUM> is also provided between the observation window <NUM> and the shell <NUM>, and the sealing window gasket <NUM> is fixed on the shell <NUM>. A control panel <NUM> of the drum washing machine <NUM> is arranged on an upper part of the front side of the shell <NUM> to facilitate the user's operation. An outer cylinder <NUM> and an inner cylinder <NUM> are arranged inside the shell <NUM>. The inner cylinder <NUM> is positioned inside the outer cylinder <NUM>. The inner cylinder <NUM> is connected to a motor <NUM> (e.g., a direct drive motor) through a transmission shaft <NUM> and a bearing <NUM>. A water inflow valve <NUM> is provided on an upper part of a rear side of the shell <NUM>, and the water inflow valve <NUM> is connected to a micro-bubble spray head <NUM> through a water pipe. As shown in <FIG>, the micro-bubble spray head <NUM> is positioned close to the upper part of the front side of the shell <NUM> and located below the control panel <NUM>. Similar to the above example, water enters the micro-bubble spray head <NUM> through the water pipe from the water inflow valve <NUM> to generate micro-bubble water containing a large number of micro-bubbles. The micro-bubble spray head <NUM> first sprays the micro-bubble water into a detergent box to mix with a detergent, and then the micro-bubble water enters the inner cylinder <NUM> through the detergent box for clothing washing. Optionally, the micro-bubble spray head <NUM> can also directly spray the micro-bubble water carrying a large number of micro-bubbles into the outer cylinder <NUM> or the inner cylinder <NUM> of the washing machine to further reduce the amount of detergent used and enhance the cleaning ability of the washing machine.

Reference is made to <FIG>, which are schematic views of an example of the micro-bubble spray head according to the present disclosure, in which <FIG> is a top view of the example of the micro-bubble spray head of the present disclosure, and <FIG> is a front view of the example of the micro-bubble spray head of the present disclosure. As shown in <FIG>, in one or more examples, the micro-bubble spray head <NUM> of the present disclosure includes a one-piece spray pipe <NUM>. A micro-bubble filter screen bag <NUM> is installed inside an outlet end <NUM> of the one-piece spray pipe <NUM>, and the micro-bubble filter screen bag <NUM> is configured to be capable of cutting and mixing the bubble water when the bubble water flows through the micro-bubble filter screen bag <NUM> to produce a large amount of micro-bubble water containing a large number of micro-bubbles.

Referring to <FIG>, in one or more examples, the one-piece spray pipe <NUM> has an inlet end <NUM> and the outlet end <NUM>. The micro-bubble filter screen bag <NUM> is fixed inside the outlet end <NUM>, and the inlet end <NUM> is configured to be connected to an external water source. Optionally, an anti-disengagement part <NUM> may be provided on the inlet end <NUM>, such as an anti-disengagement rib protruding radially outward around an outer wall of the inlet end <NUM> or an annular groove structure recessed inward from the outer wall of the inlet end <NUM>. The anti-disengagement part can prevent the one-piece spray pipe <NUM> from falling off a connected pipeline which provides water supply.

With continued reference to <FIG>, in one or more examples, the outer wall of the one-piece spray pipe <NUM> is provided with a first fixed installation part 214A, a second fixed installation part 214B, and a positioning part <NUM>, which are used to position and fix the micro-bubble spray head <NUM> to a predetermined position.

With continued reference to <FIG>, the first fixed installation part 214A and the second fixed installation part 214B are symmetrically positioned on the outer wall of the one-piece spray pipe <NUM>, and are located in the middle of the one-piece spray pipe <NUM>. The positioning part <NUM> is a long-strip-shaped rib, which protrudes radially outward from the outer wall of the one-piece spray pipe <NUM> and extends in a longitudinal direction of the one-piece spray pipe <NUM>. The first fixed installation part 214A and the second fixed installation part 214B are distributed on both sides of the positioning part <NUM>. Optionally, only one fixed installation part is provided on the one-piece spray pipe <NUM>, and the positioning part <NUM> may also be in other suitable forms.

In one or more examples, the first and second fixed installation parts 214A, 214B are screw hole structures so that the spray head <NUM> can be fixed to a target position by screws. However, the fixed installation parts may be any suitable connection structure, such as a snap-fit connection structure, a welded connection structure, and the like.

<FIG> is a cross-sectional view of a first example of the micro-bubble spray head of the present disclosure, taken along section line A-A in <FIG>. In one or more examples, a diameter-decreased conical passage part <NUM> is provided inside the one-piece spray pipe <NUM>. A first-stage diameter-decreased conical passage 217a and a second-stage diameter-decreased conical passage 217b are formed in the diameter-decreased conical passage part <NUM> in a water flow direction C, and a spray hole <NUM> is arranged at a downstream end of the diameter-decreased conical passage part <NUM>. The spray hole <NUM> is positioned close to the outlet end <NUM> of the one-piece spray pipe <NUM>. The spray hole <NUM> is in direct communication with the upstream second-stage diameter-decreased conical passage 217b and a downstream passage inside the one-piece spray pipe <NUM>. The first-stage diameter-decreased conical passage 217a extends downstream from the inlet end <NUM> of the one-piece spray pipe <NUM> to the second-stage diameter-decreased conical passage 217b, and a smallest diameter of the first-stage diameter-decreased conical passage 217a at its downstream end is larger than a largest diameter of the second-stage diameter-decreased conical passage 217b. In one or more alternative examples, in the diameter-decreased conical passage part <NUM>, either one stage of diameter-decreased conical passage may be formed in the water flow direction C, or more than two stages of diameter-decreased conical passages may be formed, such as three or more stages of diameter-decreased conical passages.

The "diameter-decreased conical passage part" mentioned herein refers to a structure in which a diameter or cross-section of the passage formed inside this part is gradually decreased in the water flow direction so that the passage has a substantially conical shape.

As shown in <FIG>, in one or more examples, an outer wall of the part of the diameter-decreased conical passage part <NUM> that corresponds to the second-stage diameter-decreased conical passage 217b is separate from the inner wall of the one-piece spray pipe <NUM>, so that an annular gap <NUM> is formed between the outer wall of this part and the inner wall of the one-piece spray pipe <NUM>. The annular gap <NUM> facilitates the mixing of air and the water flow, thereby generating more micro-bubbles.

As shown in <FIG>, a suction port <NUM> is also formed on the one-piece spray pipe <NUM>. In one or more examples, the suction port <NUM> is formed on a pipe wall of the one-piece spray pipe <NUM> and is positioned close to the spray hole <NUM>; therefore, the suction port <NUM> is also located close to the outlet end <NUM>. The water flow enters from the inlet end <NUM> of the one-piece spray pipe <NUM>, first flows through the first-stage diameter-decreased conical passage 217a, and then flows into the second-stage diameter-decreased conical passage 217b, thereby being pressurized. The pressurized water flow is sprayed from the spray hole <NUM> into the downstream passage of the one-piece spray pipe <NUM> and is rapidly expanded, thereby generating a negative pressure in the downstream passage of the one-piece spray pipe <NUM>. Under the action of the negative pressure, a large amount of outside air is sucked into the one-piece spray pipe <NUM> from the suction port <NUM> and mixes with the water flow therein to generate bubble water. The bubble water is then cut and mixed by the micro-bubble filter screen bag <NUM> as it flows through the micro-bubble filter screen bag <NUM>, thereby producing micro-bubble water.

As shown in <FIG>, in one or more examples, the micro-bubble filter screen bag <NUM> includes a bottom <NUM>, an opening <NUM>, and an annular side wall <NUM> extending between the opening <NUM> and the bottom <NUM>. The opening <NUM> is oriented toward an interior of the one-piece spray pipe <NUM>, faces the spray hole <NUM> and surrounds the spray hole <NUM>. Optionally, the bottom <NUM> is exposed outside the one-piece spray pipe <NUM>. In other words, the side wall <NUM> may extend outward beyond an end face of the outlet end <NUM>. A predetermined annular gap is left between the side wall <NUM> and the inner wall 212a of the outlet end <NUM>, and the annular gap forms the water outflow space <NUM>. The water flow sprayed from the spray hole <NUM> can thus be rapidly expanded in the micro-bubble filter screen bag <NUM> and mix with a large amount of air sucked in through the suction port <NUM> to form bubble water. Due to the existence of the water outflow space <NUM>, the bubble water can not only pass through the bottom <NUM> of the micro-bubble filter screen bag <NUM>, but also can pass through the side wall <NUM> of the micro-bubble filter screen bag <NUM>, so the bubble water is mixed and cut by mesh holes of both the bottom <NUM> and the side wall <NUM> to produce a large amount of micro-bubble water.

In one or more examples, the micro-bubble filter screen bag <NUM> is fixed on the inner wall 212a of the outlet end <NUM> through a circlip <NUM>, such as a metal circlip. Alternatively. The micro-bubble filter screen bag <NUM> can also be fixed on the inner wall of the one-piece spray pipe <NUM> through other means, such as bonding or welding.

In one or more examples, the micro-bubble filter screen bag <NUM> is formed from at least two layers of filter screens. The more layers of the filter screen, the better the effect of micro-bubble generation, but the resistance to the water flow also increases. Preferably, the number of layers of the filter screen of the micro-bubble filter screen bag <NUM> is larger than or equal to <NUM> and smaller than or equal to <NUM>. Alternatively, the number of layers of the filter screens of the micro-bubble filter screen bag <NUM> is preferably larger than or equal to <NUM> and smaller than or equal to <NUM>. The multiple layers of filter screens can ensure that the bubble water is cut more finely and mixed to a greater extent, thus enabling the generation of smaller-diameter micro-bubbles.

In one or more examples, the filter screens of the micro-bubble filter screen bag <NUM> has at least one fine hole having a diameter reaching a micron scale. Preferably, the diameter of the fine hole is between <NUM> and <NUM> microns; more preferably, the diameter of the fine hole is between <NUM> and <NUM> microns. In one or more examples, the micro-bubble filter screen bag <NUM> may be made of a metal mesh or a macromolecular material mesh, or made of other suitable hole mesh structures. The metal mesh includes but is not limited to stainless steel wire, nickel wire, brass wire and other materials. The macromolecular material mesh usually refers to a mesh with a microporous structure made by first making a macromolecular material into a wire and then weaving this wire. In a woven Dutch wire mesh, wefts are densely arranged, which can be woven by the following weaving methods: plain weave, twill weave, plain Dutch weave, twill Dutch weave, or reverse Dutch weave. The macromolecular material mesh includes but is not limited to nylon (polyester) mesh, cotton mesh, polypropylene mesh, etc. For example, the filter screen may be formed of a cotton mesh.

<FIG> is a cross-sectional view of a second example of the micro-bubble spray head of the present disclosure taken along section line A-A in <FIG>. As shown in <FIG>, a diameter-decreased conical passage part <NUM> is also formed in the one-piece spray pipe <NUM>. A first-stage diameter-decreased conical passage 217a and a second-stage diameter-decreased conical passage 217b are formed inside the diameter-decreased conical passage part <NUM> in the water flow direction C, and a spray hole <NUM> is arranged at a downstream end of the diameter-decreased conical passage part <NUM>. The spray hole <NUM> is positioned close to the outlet end <NUM> of the one-piece spray pipe <NUM>, and the suction port <NUM> is positioned close to the spray hole <NUM>. In this example, a flow disturbing part <NUM> is formed on the inner wall of the diameter-decreased conical passage part <NUM> that corresponds to the second-stage diameter-decreased conical passage 217b to increase the turbulence of the water flow, thereby improving a mixing degree of water and air. In one or more examples, the flow disturbing part <NUM> is at least one flow disturbing rib extending longitudinally along the inner wall of this stage of diameter-decreased conical passage, such as a plurality of flow disturbing ribs. In an alternative example, the flow disturbing part <NUM> may be at least one radial protrusion on the inner wall of this stage of diameter-decreased conical passage, such as one or more cylindrical protrusions. Optionally, the flow disturbing part <NUM> may be formed only on the inner wall corresponding to the first-stage diameter-decreased conical passage, or formed on the inner wall corresponding to each stage of diameter-decreased conical passage, or formed on the inner wall corresponding to more than one stage of diameter-decreased conical passage. The other parts of this example that are not mentioned are the same as those of the above example.

<FIG> is a cross-sectional view of a third example of the micro-bubble spray head of the present disclosure taken along section line A-A in <FIG>. As shown in <FIG>, in this example, a diameter-decreased conical passage part <NUM> is also formed in the one-piece spray pipe <NUM>. A first-stage diameter-decreased conical passage 217a and a second-stage diameter-decreased conical passage 217b are formed inside the diameter-decreased conical passage part <NUM> in the water flow direction C, and a spray hole <NUM> is arranged at a downstream end of the diameter-decreased conical passage part <NUM>. The spray hole <NUM> is positioned close to the inlet end <NUM> of the one-piece spray pipe <NUM>, but the suction port <NUM> is positioned close to the outlet end <NUM> of the one-piece spray pipe <NUM>, and thus also close to the micro-bubble filter screen bag <NUM>. In this example, the suction port <NUM> is still within an action range of the negative pressure generated by the spray hole <NUM>, so when the water flow is sprayed from the spray hole <NUM> into the downstream passage of the one-piece spray pipe <NUM> in an expanded state, the outside air is sucked into the one-piece spray pipe <NUM> from the suction port <NUM> under the action of the negative pressure and mixes with the water flow. In this example, a flow disturbing part <NUM> is also formed on the inner wall of the diameter-decreased conical passage part <NUM> that corresponds to the second-stage diameter-decreased conical passage 217b, such as a plurality of flow disturbing ribs extending longitudinally along this inner wall. The other parts of this example that are not mentioned are the same as those of the above examples.

<FIG> is a cross-sectional view of a fourth example of the micro-bubble spray head of the present disclosure taken along section line A-A in <FIG>. As shown in <FIG>, in this example, a diameter-decreased conical passage part <NUM> is also formed in the one-piece spray pipe <NUM>. A first-stage diameter-decreased conical passage 217a and a second-stage diameter-decreased conical passage 217b are formed inside the diameter-decreased conical passage part <NUM> in the water flow direction C, and a spray hole <NUM> is arranged at a downstream end of the diameter-decreased conical passage part <NUM>. The spray hole <NUM> is positioned close to the inlet end <NUM> of the one-piece spray pipe <NUM>. According to the invention, the one-piece spray pipe <NUM> is provided with a first suction port 216a and a second suction port 216b. The first suction port 216a is positioned close to the spray hole <NUM> and thus close to the inlet end <NUM>. The second suction port 216b is positioned close to the outlet end <NUM> of the one-piece spray pipe <NUM> and thus also close to the micro-bubble filter screen bag <NUM>. Providing the first suction port and the second suction port at the same time helps suck in more outside air, thereby generating more micro-bubbles. In this example, a flow disturbing part <NUM> is also formed on the inner wall of the diameter-decreased conical passage part <NUM> that corresponds to the second-stage diameter-decreased conical passage 217b, such as a plurality of flow disturbing ribs extending longitudinally along this inner wall. The other parts of this example that are not mentioned are the same as those of the above examples.

Claim 1:
A micro-bubble spray head (<NUM>), wherein the micro-bubble spray head (<NUM>) comprises a one-piece spray pipe (<NUM>) and a micro-bubble filter screen bag (<NUM>) fixed inside an outlet end (<NUM>) of the one-piece spray pipe (<NUM>);
a Venturi tube structure is formed in the one-piece spray pipe (<NUM>), and a suction port (<NUM>) is provided on the one-piece spray pipe (<NUM>), so that air is sucked into the one-piece spray pipe (<NUM>) through the suction port (<NUM>) by means of a negative pressure produced by the Venturi tube structure and mixes with a water flow in the one-piece spray pipe (<NUM>) to produce bubble water; and
the micro-bubble filter screen bag (<NUM>) comprises an opening (<NUM>), a bottom (<NUM>) and a side wall (<NUM>) between the opening (<NUM>) and the bottom (<NUM>); the opening (<NUM>) faces the Venturi tube structure, and a water outflow space is formed between the side wall (<NUM>) and an inner wall (221a) of the outlet end (<NUM>) so that the bubble water can pass through the side wall (<NUM>) and the bottom (<NUM>) to form micro-bubble water;
wherein the Venturi tube structure is composed of a diameter-decreased conical passage part (<NUM>), an at-least-one-stage diameter-decreased conical passage is formed in the diameter-decreased conical passage part (<NUM>) in a water flow direction, and a spray hole (<NUM>) is arranged at a downstream end of the diameter-decreased conical passage part (<NUM>), so that the water flow pressurized by the at-least-one-stage diameter-decreased conical passage can be sprayed from the spray hole (<NUM>) and generate a negative pressure in the one-piece spray pipe (<NUM>), and wherein when the spray hole (<NUM>) is positioned close to an inlet end (<NUM>) of the one-piece spray pipe (<NUM>), the suction port (<NUM>) is positioned close to the spray hole (<NUM>) and/or positioned at the outlet end (<NUM>);
characterized in that a first suction port (216a) and a second suction port (216b) are provided on the one-piece spray pipe (<NUM>), the first suction port (216a) is positioned close to the spray hole (<NUM>), and the second suction port (216b) is positioned at the outlet end (<NUM>).