Patent Description:
The present disclosure relates to a washing apparatus, and specifically to a micro-bubble spray head, a micro-bubble treatment agent box assembly and a washing apparatus having the micro-bubble treatment agent box assembly.

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 is usually 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 make the micro-bubbles have extremely strong cleaning and purifying abilities. At present, micro-bubbles have been widely used in washing apparatuses such as clothing washing machines.

For example, Chinese patent publication <CIT> discloses a washing machine. The washing machine has a water supply mechanism part (equivalent to a detergent box assembly), and the water supply mechanism part is provided therein with a detergent/treatment agent box (which is configured to accommodate powder, liquid detergent and softener) and a micro-bubble generator for providing micro-bubble water to the detergent/treatment agent box to dissolve the detergent/treatment agent. Specifically, <CIT> discloses that the micro-bubble generator has a cylindrical spray pipe, and a one-stage diameter-decreased conical passage part, a protruding part (which forms a throttling hole) and a mixing cavity (having a diameter which is larger than that of the throttling hole and which keeps constant) are formed in the spray pipe in a water flow direction. After an electromagnetic water supply valve is opened, a water flow from a main water pipe is rapidly depressurized when it flows through this micro-bubble generator, so that air in the water flow is separated out to generate micro-bubbles in the water; then the micro-bubble water flows into the detergent/treatment agent box, mixes with the detergent or softener and the like in the detergent/treatment agent box, and then enters a washing cylinder for clothing washing. However, such a micro-bubble generator can only rely on the very limited air carried inside the liquid flowing therethrough to generate micro-bubbles; therefore, this micro-bubble generator cannot provide micro-bubble water containing enough micro-bubbles for the detergent/treatment agent box, thereby affecting the dissolution of detergent and/or softener and further resulting in poor cleaning effect. The residual detergent may cause hidden dangers to the health of user.

Furthermore, US patent publication <CIT> discloses a spray head according to the preamble of claim <NUM>. It discloses a device for producing a stream of liquid containing air bubbles, wherein it includes a body member defining a chamber, an inlet for the admission of air into the chamber, a perforated disc and a plurality of fine-mesh screens positioned within the chamber, and a perforated shell engaging the peripheries of the disc and the screens for spacing the same.

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 an efficiency of micro-bubble generation of existing micro-bubble spray heads is not high, the present disclosure provides a micro-bubble spray head as defined 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 spray pipe and a micro-bubble bubbler fixed at the outlet end of the spray pipe. A diameter-decreased conical passage part and a mixing cavity are provided in the spray pipe. There is an at-least-one-stage diameter-decreased conical passage in the diameter-decreased conical passage part in the water flow direction, and a throttling hole is arranged at the downstream end of the diameter-decreased conical passage part. The at-least-one-stage diameter-decreased conical passage can pressurize the water flow flowing therethrough. The diameter of the throttling hole is much smaller than the diameter of the mixing cavity, so the pressurized water flow can be rapidly expanded and sprayed into the mixing cavity through the throttling hole and generate a negative pressure in the mixing cavity. The outlet end of the spray pipe and the micro-bubble bubbler are respectively provided with suction ports communicating with each other. These suction ports are configured such that the outside air can be sucked into the mixing cavity in a large amount through these suction ports by means of the negative pressure and mix with the water flow in the mixing cavity to form bubble water. The generated bubble water is then cut and mixed by the micro-bubble bubbler to form micro-bubble water containing a large number of micro-bubbles. Therefore, the micro-bubble spray head of the present disclosure significantly improves the efficiency of micro-bubble generation.

Preferably, the diameter of the mixing cavity keeps constant after a sudden increase relative to the diameter of the throttling hole, or continues to increase gradually, thereby helping increase a mixing degree of the air and the water flow.

Preferably, the flow disturbing part provided on the inner wall of the diameter-decreased conical passage part can help the water flow mix with the sucked-in air more effectively at a downstream position by increasing the turbulence of water.

Preferably, the suction ports can also act as the overflow openings of the micro-bubble spray head when needed. When the water pressure in the spray pipe is insufficient and therefore the water flow cannot quickly penetrate the filter screen in the micro-bubble bubbler, the water flow can flow out from these overflow openings, avoiding the problem that the air cannot be sucked in due to blockage of the suction ports caused by the accumulation of water flow in the mixing cavity, and thus ensuring the high reliability of the micro-bubble spray head to continuously produce micro-bubble water.

The multi-layer filter screen included in the micro-bubble bubbler can significantly reduce the diameter of the micro-bubbles and increase the mixing degree of the micro-bubbles with water. The multi-layer filter screen is fixed by the screen bracket, which can avoid the problem of the filter screen falling off the spray pipe under the impact of high water pressure.

Preferably, the mutual cooperation of the plurality of claws on the outlet end of the spray pipe and the plurality of snap-fit openings on the screen bracket enables the spray pipe and the micro-bubble bubbler to be fixed together by a snap-fit connection structure.

The pressure ring located between the outlet end of the spray pipe and the screen bracket abuts the multi-layer filter screen against the screen bracket to further firmly fix the filter screen. Grooves are respectively formed between the plurality of bosses on the two axial end faces of the pressure ring, and these grooves help suck in air from the outside, so as to further ensure the reliability of air suction.

In order to solve the technical problem that the efficiency of dissolving the detergent/treatment agent in existing micro-bubble treatment agent boxes is not high, the present disclosure further provides a micro-bubble treatment agent box assembly. In a first embodiment, the micro-bubble treatment agent box assembly includes a detergent/treatment agent box, and any one of the micro-bubble spray heads as described above, which is arranged on the detergent/treatment agent box; the micro-bubble spray head is configured to provide micro-bubble water to the detergent/treatment agent box to dissolve a detergent/treatment agent. By spraying the micro-bubble water generated by the micro-bubble spray head into the detergent/treatment agent box of the washing apparatus, the detergent/treatment agent contained in the detergent/treatment agent box can be quickly and efficiently dissolved.

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

List of reference signs:
<NUM>: pulsator washing machine; <NUM>: cabinet; <NUM>: tray; <NUM>: upper cover; <NUM>: foot of pulsator washing machine; <NUM>: outer tub; <NUM>: inner tub; <NUM>: spin-drying hole; <NUM>: pulsator; <NUM>: transmission shaft of pulsator washing machine; <NUM>: motor of pulsator washing machine; <NUM>: balance ring; <NUM>: drain valve; <NUM>: drain pipe; <NUM>: water inflow valve; <NUM>: micro-bubble spray head; <NUM>: spray pipe; <NUM>: inlet end; <NUM>: positioning part; <NUM>: claw; <NUM>: outlet end; 214a: outlet end face; <NUM>: suction port on spray pipe; <NUM>: diameter-decreased conical passage part; 216a: first-stage diameter-decreased conical passage; 216b: second-stage diameter-decreased conical passage; <NUM>: flow disturbing rib; <NUM>: throttling hole; <NUM>: mixing cavity; <NUM>: annular cavity; <NUM>: micro-bubble bubbler; <NUM>: screen bracket; 221a: first axial end; 221b: second axial end; 221c: step; <NUM>: suction port on micro-bubble bubbler; <NUM>: snap-fit opening; <NUM>: filter screen; <NUM>: pressure ring; 225a: first axial end face; 225b: second axial end face; <NUM>: boss; <NUM>: groove; <NUM>: drum washing machine; <NUM>: shell; <NUM>: outer cylinder; <NUM>: inner cylinder; <NUM>: motor of drum washing machine; <NUM>: transmission shaft of drum washing machine; <NUM>: bearing; <NUM>: top panel; <NUM>: control panel; <NUM>: observation window; <NUM>: sealing window gasket; <NUM>: door; <NUM>: foot of drum washing machine; <NUM>: micro-bubble treatment agent box assembly; <NUM>: detergent/treatment agent box; <NUM>: water outlet.

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 of the present disclosure.

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 technical problem that a micro-bubble production yield of existing micro-bubble generators is not high, the present disclosure provides a micro-bubble spray head <NUM>. The micro-bubble spray head <NUM> includes a spray pipe <NUM> and a micro-bubble bubbler <NUM> fixed at an outlet end <NUM> of the spray pipe <NUM>. A diameter-decreased conical passage part <NUM> and a mixing cavity <NUM> are provided in the spray pipe <NUM>. There is an at-least-one-stage diameter-decreased conical passage in the diameter-decreased conical passage part <NUM> in a water flow direction C. A throttling hole <NUM> is arranged at a downstream end of the diameter-decreased conical passage part <NUM>, and a diameter of the throttling hole <NUM> is smaller than that of the mixing cavity <NUM>, so that a water flow is sprayed into the mixing cavity <NUM> through the throttling hole <NUM> and generates a negative pressure in the mixing cavity <NUM>. The outlet end <NUM> of the spray pipe <NUM> and the micro-bubble bubbler <NUM> are respectively provided with suction ports <NUM>, <NUM> communicating with each other so that air can be sucked into the mixing cavity <NUM> through the suction ports <NUM>, <NUM> by means of the negative pressure and mix with the water flow to form bubble water. The bubble water is cut and mixed by the micro-bubble bubbler <NUM> to form micro-bubble water.

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

<FIG> is a top view of an example of the micro-bubble spray head of the present disclosure, <FIG> is a front view of the example of the micro-bubble spray head of the present disclosure shown in <FIG>, and <FIG> is an exploded perspective view of the example of the micro-bubble spray head of the present disclosure shown in <FIG>. As shown in <FIG>, in one or more examples, the spray pipe <NUM> is a one-piece spray pipe and is substantially cylindrical. The spray pipe <NUM> has an inlet end <NUM> and an outlet end <NUM>. The inlet end <NUM> is configured to connect to an external water source, such as tap water, and the micro-bubble bubbler <NUM> is fixed at the outlet end <NUM>. Therefore, the water flow can flow into the spray pipe <NUM> from the inlet end <NUM>, and then flow out of the spray pipe <NUM> from the outlet end <NUM> through the micro-bubble bubbler <NUM>.

A positioning part <NUM> may be provided on an outer wall of the spray pipe <NUM> for positioning the micro-bubble spray head <NUM> at a suitable position. Referring to <FIG> and <FIG>, in one or more examples, the positioning part <NUM> may be a longitudinal rib extending or partially extending between the inlet end <NUM> and the outlet end <NUM> in an axial direction of the spray pipe <NUM>. Alternatively, the positioning part <NUM> may also take other suitable forms, such as a cylindrical protrusion or groove.

Referring to <FIG> and <FIG>, in one or more examples, a plurality of claws <NUM>, such as two, three or more claws <NUM>, are provided on the outer wall of the outlet end <NUM> of the spray pipe <NUM>, which are configured to fix the micro-bubble bubbler <NUM> and the spray pipe <NUM> together. Optionally, the claws <NUM> are distributed circumferentially along the outer wall of the outlet end <NUM> and extend radially outwardly, being spaced apart from each other by the same distance or different distances. With continued reference to <FIG>, the outlet end <NUM> of the spray pipe <NUM> is further provided with a plurality of suction ports <NUM>, such as two, three or more suction ports <NUM>. These suction ports <NUM> are distributed along the circumferential direction of the outlet end <NUM> and are spaced apart from each other by the same distance or different distances. As shown in <FIG>, in one or more examples, each suction port <NUM> is a substantially rectangular notch recessed from an outlet end face 214a of the outlet end <NUM> toward the inlet end <NUM> in an axial direction of the spray pipe <NUM>. Alternatively, the suction ports <NUM> may also be through holes, such as circular holes, provided on the pipe wall of the outlet end <NUM>.

As shown in <FIG> and <FIG>, in one or more examples, the micro-bubble bubbler <NUM> includes a filter screen <NUM> and a screen bracket <NUM> that fixes the filter screen <NUM> at the outlet end <NUM> of the spray pipe <NUM>. As shown in <FIG>, in one or more examples, the screen bracket <NUM> is open at both ends and is substantially cylindrical. The screen bracket <NUM> has a first axial end 221a and a second axial end 221b. The first axial end 221a is configured to be capable of abutting against the filter screen <NUM>, and the second axial end 221b is configured to be capable of being sleeved over the outer wall of the outlet end <NUM> of the spray pipe <NUM>, so that in a state where the micro-bubble bubbler <NUM> and the spray pipe <NUM> are assembled, the filter screen <NUM> is firmly sandwiched between the first axial end 221a of the screen bracket <NUM> and the outlet end face 214a of the spray pipe <NUM>.

Referring to <FIG>, in one or more examples, a plurality of suction ports <NUM> and a plurality of snap-fit openings <NUM> are provided on the second axial end 221b of the screen bracket <NUM>. Both the suction ports <NUM> and the snap-fit openings <NUM> are arranged along the circumferential direction of the second axial end 221b. The distances between the suction ports <NUM> are the same or different, the distances between the snap-fit openings <NUM> are the same or different, and the distances between the suction ports <NUM> and the snap-fit openings <NUM> are the same or different. After the micro-bubble bubbler <NUM> and the spray pipe <NUM> are assembled, each suction port <NUM> on the screen bracket <NUM> corresponds to one suction port <NUM> at the outlet end <NUM> of the spray pipe <NUM> respectively, so that the corresponding suction ports <NUM> and <NUM> not only communicate with each other, but also communicate with the mixing cavity <NUM>, thereby allowing the outside air to be sucked into the mixing cavity <NUM> of the spray pipe <NUM> through these suction ports <NUM>, <NUM>. It should also be pointed out that these suction ports <NUM>, <NUM> can also act as overflow openings at the same time. If the water pressure in the spray pipe <NUM> is insufficient, the water flow may not be able to quickly penetrate the filter screen in the micro-bubble bubbler <NUM>, and thus will accumulate in the mixing cavity <NUM> of the spray pipe <NUM>. These overflow openings allow the water flow to flow out therethrough, thereby avoiding a situation in which the air cannot be sucked in due to blockage of the suction ports caused by the accumulation of water flow in the mixing cavity, and thus ensuring the high reliability of the micro-bubble spray head to continuously produce micro-bubble water. Further, after the micro-bubble bubbler <NUM> and the spray pipe <NUM> are assembled, each snap-fit opening <NUM> on the screen bracket <NUM> receives a corresponding one of the claws <NUM> at the outlet end <NUM> of the spray pipe <NUM>, so that the micro-bubble bubbler <NUM> and the spray pipe <NUM> are fixed together. Alternatively, the micro-bubble bubbler <NUM> and the spray pipe <NUM> can also be fixed together by using other connection methods, such as welding, screwing and the like.

As shown in <FIG>, according to the invention, the filter screen <NUM> includes a multi-layer filter screen, e.g., two, three or more layers. The filter screen is a hole mesh structure, and the hole mesh structure has at least one mesh hole having a diameter reaching a micron scale. Preferably, the diameter of the mesh hole is between <NUM> and <NUM> microns; more preferably, the diameter of the mesh hole is between <NUM> microns and <NUM> microns. The filter screen can be a plastic fence, a metal mesh, a macromolecular material mesh, or other suitable hole mesh structures. The plastic fence usually refers to a macromolecular fence, which is integrally injection-molded by using a macromolecular material; or a macromolecular material is first made into a plate, and then a microporous structure is formed on the plate by machining to form the plastic fence. The macromolecular material mesh usually refers to a mesh with a microporous structure made by first making a macromolecular material into wires, and then weaving the wires. The macromolecular material mesh may include nylon mesh, cotton mesh, polyester mesh, polypropylene mesh, and the like. Alternatively, the filter screen may be other hole mesh structures capable of generating micro-bubbles, such as a hole mesh structure composed of two non-micron-scale honeycomb structures. When the bubble water flows through the hole mesh structure, the hole mesh structure mixes and cuts the bubble water, thereby generating a large amount of micro-bubble water.

With continued reference to <FIG>, according to the invention, the micro-bubble bubbler <NUM> further includes a pressure ring <NUM>. The pressure ring <NUM> has a substantially circular ring shape. The pressure ring <NUM> has a first axial end face 225a and a second axial end face 225b. According to the invention, a plurality of bosses <NUM> are provided on each of the first axial end face 225a and the second axial end face 225b in the circumferential direction. These bosses <NUM> are spaced apart from each other by a predetermined distance and extend axially outwardly from their respective corresponding end faces, so that a groove <NUM> is formed between every two bosses <NUM> on each of the axial end faces 225a, 225b. In the assembled state, the first axial end face 225a faces the filter screen <NUM> and the screen bracket <NUM>, and the bosses <NUM> on the first axial end face 225a firmly abut the filter screen <NUM> against a step 221c extending radially inwardly and located inside the first axial end 221a of the screen bracket <NUM> (see <FIG>); the second axial end face 225b faces the outlet end face 214a of the spray pipe <NUM>, and the bosses <NUM> on the second axial end face 225b abut against the outlet end face 214a of the spray pipe <NUM>. The grooves <NUM> located between the bosses <NUM> communicate with the mixing cavity <NUM>, and thus can also act as suction ports. By allowing the outside air to be sucked in from these grooves <NUM>, the reliability of the air introduction into the spray pipe is further improved.

<FIG> is a cross-sectional view of an example of the micro-bubble spray head of the present disclosure taken along section line A-A in <FIG>. As shown in <FIG>, in one or more examples, a first-stage diameter-decreased conical passage 216a and a second-stage diameter-decreased conical passage 216b are formed inside the diameter-decreased conical passage part <NUM> of the spray pipe <NUM> in the water flow direction C. Alternatively, one or more than two stages of diameter-decreased conical passages may be formed inside the diameter-decreased conical passage part <NUM> in the water flow direction. The first-stage diameter-decreased conical passage 216a extends from the inlet end <NUM> of the spray pipe <NUM> to the second-stage diameter-decreased conical passage 216b. A smallest diameter of the first-stage diameter-decreased conical passage 216a may be larger than a largest diameter of the second-stage diameter-decreased conical passage 216b. The second-stage diameter-decreased conical passage 216b continues to extend downstream in the water flow direction C to a throttling hole <NUM> located at a downstream end of the diameter-decreased conical passage part <NUM>. A diameter of the throttling hole <NUM> is smaller than or equal to a smallest diameter of the second-stage diameter-decreased conical passage 216b. A diameter of the mixing cavity <NUM> located downstream of the throttling hole <NUM> is much larger than the diameter of the throttling hole <NUM>. Optionally, the diameter of the mixing cavity <NUM> may keep constant in the water flow direction C, or the diameter of the mixing cavity <NUM> may gradually increase in the water flow direction C to increase a mixing degree of air and water.

The water flow flows into the spray pipe <NUM> from the inlet end <NUM>, and then first flows through the first-stage diameter-decreased conical passage 216a and the second-stage diameter-decreased conical passage 216b to be pressurized therein. The pressurized water flow is rapidly expanded and sprayed into the downstream mixing cavity <NUM> through the throttling hole <NUM> and generates a negative pressure in the mixing cavity <NUM>. Therefore, under the action of the negative pressure, the outside air is sucked into the mixing cavity <NUM> through the suction ports <NUM>, <NUM> and/or <NUM> and mixes with the water flow in the mixing cavity <NUM> to generate bubble water. The bubble water then flows through the filter screen <NUM> of the micro-bubble bubbler <NUM> to be cut and mixed, thereby generating micro-bubble water containing a large number of micro-bubbles.

As shown in <FIG>, in one or more examples, a plurality of flow disturbing ribs <NUM> extending in the longitudinal direction are provided on the inner wall of the second-stage diameter-decreased conical passage 216b. These ribs <NUM> are spaced apart from each other to increase the turbulence of the water flow, which can help the water flow mix with the sucked-in air more effectively at a downstream position. Alternatively, the flow disturbing ribs may be replaced by at least one radial protrusion provided on the inner wall of this stage of diameter-decreased conical passage, such as one or more cylindrical protrusions. Alternatively, the flow disturbing ribs or other forms of flow disturbing parts may be formed on the inner wall of each stage of diameter-decreased conical passage.

With continued reference to <FIG>, in one or more examples, the part of the diameter-decreased conical passage part <NUM> that corresponds to the second-stage diameter-decreased conical passage 216b is separate from the inner wall of the spray pipe <NUM>, so that an annular cavity <NUM> is formed between this part and the corresponding inner wall of the spray pipe <NUM>. The annular cavity <NUM> communicates with the mixing cavity <NUM> to form an entirety, thereby helping further enhance the mixing of air and water.

<FIG> is a top view of an example of the micro-bubble treatment agent box assembly of the present disclosure, and <FIG> is a cross-sectional view of the example of the micro-bubble treatment agent box assembly of the present disclosure, taken along section line B-B in <FIG>. As shown in <FIG>, the present disclosure also provides a micro-bubble treatment agent box assembly <NUM>. The micro-bubble treatment agent assembly <NUM> includes a detergent/treatment agent box <NUM> and a micro-bubble spray head <NUM> arranged on the detergent/treatment agent box <NUM>. In one or more examples, the detergent/treatment agents that can be accommodated by the detergent/treatment agent box <NUM> include, but are not limited to, powder detergents, solid detergents, or liquid detergents. The detergent/treatment agent box <NUM> is provided with a water inlet and a water outlet <NUM>, and the water inlet is provided by the micro-bubble spray head <NUM>.

As shown in <FIG>, in one or more examples, the micro-bubble spray head <NUM> is positioned on an upper part of one side wall of the detergent/treatment agent box <NUM>, and the water outlet <NUM> is positioned at the bottom of another side wall of the detergent/treatment agent box <NUM>. As shown in <FIG>, the side wall where the micro-bubble spray head <NUM> is located and the side wall where the water outlet <NUM> is located are opposite to each other. Water from an external water source can be sprayed into the detergent/treatment agent box <NUM> through the micro-bubble spray head <NUM> from the inlet end <NUM> of the micro-bubble spray head <NUM> so that the micro-bubble water can be used to dissolve the detergent/treatment agent accommodated in the detergent/treatment agent box <NUM>. The micro-bubble spray head <NUM> may be any one of the micro-bubble spray heads described above. A micro-bubble water mixture in which the detergent/treatment agent is dissolved is discharged from the water outlet <NUM>; for example, it is supplied to a washing apparatus. As compared with the micro-bubble treatment agent box assembly with a micro-bubble generator in the prior art, the ability of the micro-bubble treatment agent box assembly of the present disclosure to generate micro-bubbles is greatly improved, thereby increasing a dissolving speed, a dissolution rate and a mixing degree of the detergent/treatment agent in the water, which can further save the amount of detergent/treatment agent used.

Claim 1:
A micro-bubble spray head (<NUM>), comprising a spray pipe (<NUM>) and a micro-bubble bubbler (<NUM>) fixed at an outlet end (<NUM>) of the spray pipe (<NUM>);
wherein a diameter-decreased conical passage part (<NUM>) and a mixing cavity (<NUM>) are provided in the spray pipe (<NUM>); there is an at-least-one-stage diameter-decreased conical passage in the diameter-decreased conical passage part (<NUM>) in a water flow direction; a throttling hole (<NUM>) is arranged at a downstream end of the diameter-decreased conical passage part (<NUM>), and a diameter of the throttling hole (<NUM>) is smaller than a diameter of the mixing cavity (<NUM>), so that a water flow is sprayed into the mixing cavity (<NUM>) through the throttling hole (<NUM>) and generates a negative pressure in the mixing cavity (<NUM>); and
the outlet end (<NUM>) of the spray pipe (<NUM>) and the micro-bubble bubbler (<NUM>) are respectively provided with suction ports (<NUM>, <NUM>) that can communicate with each other so that air can be sucked into the mixing cavity (<NUM>) through the suction ports (<NUM>, <NUM>) by means of the negative pressure and mix with the water flow to form bubble water; and the bubble water is cut and mixed by the micro-bubble bubbler (<NUM>) to form micro-bubble water,
wherein the micro-bubble bubbler (<NUM>) comprises a multi-layer filter screen (<NUM>) and a screen bracket (<NUM>) for fixing the multi-layer filter screen (<NUM>),
wherein the micro-bubble bubbler (<NUM>) further comprises a pressure ring (<NUM>), and the pressure ring (<NUM>) is placed between an end face (214a) of the outlet end (<NUM>) and the screen bracket (<NUM>) so as to abut the multi-layer filter screen (<NUM>) against the screen bracket (<NUM>),
characterized in that a plurality of spaced apart bosses (<NUM>) extending outward in an axial direction are respectively formed on two axial end faces (225a, 225b) of the pressure ring (<NUM>) so that a groove (<NUM>) is formed between the adjacent bosses (<NUM>).