Air suction shower head

Abstract

The air suction shower head comprises a body, a water distribution seat and a plug, the water distribution seat is installed in the body, a water-air mixing cavity and a water inlet hole communicated with the water-air mixing cavity are formed in the water distribution seat, the water inlet hole sequentially comprises a water inlet section and an air suction section in the water inlet direction, an air suction hole is formed in the inner wall of the air suction section, and the plug comprises a film capable of elastically deforming. When not deformed, the thin film can be tightly attached to the inner wall of the air suction section to seal the air suction hole, water flow can form a water column after passing through the water inlet section, a distance exists between the water column and the thin film which is not deformed, and the thin film can retract inwards to open the air suction hole in the water passing state. When water flow is input from the water inlet section and then passes through the thin film, a negative pressure area can be generated on the inner side of the thin film, the thin film contracts and deforms inwards under the influence of external atmospheric pressure, the air suction hole is opened, air is sucked from the outside, air and water are mixed to generate bubble water, the thin film is reset after water is closed, non-return is achieved, and air hole water leakage is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of shower heads, and particularly to a suction shower head. Background Art

[0002] Bubble water, also known as oxygenated water, is formed when the shower head inhales air during the water outlet process, causing the water and air to mix and shoot out from the nozzle. Since the water contains a certain amount of gas, the water flow feels soft when acting on the human body, and it can make people feel sufficient and full of moisture. At the same time, bubble water can also improve the water flow utilization rate, achieving a certain water-saving effect, and improving the deficiencies of the traditional direct water with large impact force and water waste. Therefore, it is a water outlet mode widely favored by the industry and users.

[0003] Most of the existing suction shower heads for shower use are provided with a single suction hole beside the water path, and the residual water in the shower head cavity will flow back out from the suction hole after the water is turned off. Summary of the Invention

[0004] The present invention aims to at least solve one of the above technical problems in the related art to some extent. For this purpose, the present invention provides a suction shower head.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] The suction shower head according to an embodiment of the present invention includes a body, a water distribution seat and a plug. The water distribution seat is installed in the body. The water distribution seat is provided with a water-gas mixing cavity and a water inlet hole communicating with the water-gas mixing cavity. The water inlet hole sequentially includes a water inlet section and a suction section along the water inlet direction. The inner wall of the suction section is provided with a suction hole. The plug includes an elastically deformable film. The film is arranged in the suction section. The film is adapted to the inner wall of the suction section. When the film is not deformed, it can closely adhere to the inner wall of the suction section to close the suction hole. When water flows through the water inlet section, a water column can be formed. There is a distance between the water column and the film when the film is not deformed. In the water passing state, the film can contract inward to open the suction hole.

[0007] The suction shower head according to an embodiment of the present invention has at least the following beneficial effects:

[0008] When water flows from the water inlet section and then passes through the film, the water flow is sprayed into the water-gas mixing cavity in a water column shape. At this time, a negative pressure area will be generated inside the film. Since there is a distance between the film and the water column for the film to contract inward, the film can be affected by the external atmospheric pressure and contract and deform inward. The suction hole is opened, and air is inhaled from the outside to realize the mixing of gas and water to generate bubble water. After the water is turned off, the film resets to realize anti-backflow and prevent water leakage from the air hole.

[0009] According to some embodiments of the present invention, the thin film is composed of two or more film flaps, and the film flaps are arranged at intervals along the circumferential direction of the water inlet hole.

[0010] According to some embodiments of the present invention, the plug further includes a fixing seat. The fixing seat is annular and is embedded in the water inlet section. The inner diameter of the fixing seat is smaller than the inner diameter of the air suction section. The two axial ends of the fixing seat are respectively a water inlet end and a water outlet end, and the thin film is fixedly connected to the water outlet end of the fixing seat.

[0011] According to some embodiments of the present invention, a guiding conical surface is formed on the inner wall of the water inlet end of the fixing seat, and the diameter of the guiding conical surface gradually decreases along the water inlet direction.

[0012] According to some embodiments of the present invention, spiral ribs are provided on the inner wall of the fixing seat so as to form a spiral jet channel inside the fixing seat.

[0013] According to some embodiments of the present invention, it further includes a cover plate. The cover plate covers above the water-air mixing cavity. An air suction cavity is provided on the upper surface of the cover plate. At least one air inlet hole is opened on the cavity wall of the air suction cavity. One end of the air suction cavity is provided with an air suction channel. The air suction channel is located above the air suction section. The air suction channel communicates the air suction cavity and the air inlet hole, and the air inlet hole is far from the air suction channel.

[0014] According to some embodiments of the present invention, it further includes an upper cover. A surrounding rib is provided on the upper surface of the cover plate. The upper cover covers the area surrounded by the surrounding rib to form the air suction cavity, and the air inlet hole is opened on the upper cover.

[0015] According to some embodiments of the present invention, the width of the air suction cavity in the up-down direction gradually becomes larger along the air flow direction.

[0016] According to some embodiments of the present invention, the inner wall surfaces of the air suction cavity and the air suction channel are coated with a hydrophobic coating.

[0017] According to some embodiments of the present invention, it further includes a water outlet switching valve for switching the water outlet mode of the shower head. The water outlet switching valve is installed inside the handle of the main body. The water outlet switching valve includes a valve body and a button assembly. A water outlet hole column is provided on the valve body. The water outlet hole column is embedded in the water inlet hole, and the water outlet hole column is butted against the water inlet end of the fixing seat. The ratio relationship between the cross-sectional area A1 of the water outlet hole column and the minimum projected area A2 of the spiral jet channel satisfies A1≥4*A2.

[0018] According to some embodiments of the present invention, it further includes a sealing seat and a water outlet net. The sealing seat is connected below the water distribution seat. A plurality of water discharge grooves are provided on the water-gas mixing cavity. A water distribution cavity is provided on the sealing seat. The water distribution cavity is communicated with the water discharge grooves. A plurality of water distribution holes are provided at the bottom of the water distribution cavity. The water outlet net is arranged below the sealing seat. Water outlet holes are provided on the water outlet net. A water distribution space for the flow of bubble water is formed between the sealing seat and the water outlet net. The water distribution holes are communicated with the water outlet holes through the water distribution space. A water retaining rib is provided along the circumference of the water outlet end of the water inlet hole. The water passing area of the water retaining rib is A3. The total water passing area of all the water discharge grooves is A4. The total water passing area of all the water distribution holes is A5. The total water passing area of all the water outlet holes is A6. Let A4 > A5 > A6 > A3 > A2.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is an exploded view of the air-inlet shower head of the present invention;

[0022] Figure 2 is a schematic structural view of the plug of the present invention;

[0023] Figure 3 is a schematic structural view of the water distribution seat of the present invention;

[0024] Figure 4 is a first partial cross-sectional view of the air-inlet shower head of the present invention;

[0025] Figure 5 is Figure 4 a partial enlarged view at A in (water shut-off state);

[0026] Figure 6 is Figure 4 a partial enlarged view at A in (water flowing state);

[0027] Figure 7 is a schematic structural view of the cover plate of the present invention;

[0028] Figure 8 is a second partial cross-sectional view of the air-inlet shower head of the present invention;

[0029] Figure 9 is a schematic structural view of the sealing seat of the present invention.

[0030] Reference numerals: body 100, water distribution base 200, water-gas mixing chamber 210, water inlet hole 220, air suction hole 221, water blocking rib 222, water inlet section 223, air suction section 224, water drainage trough 230, plug 300, fixing base 310, guiding conical surface 311, spiral rib 312, thin film 320, membrane flap 321, cover plate 400, air suction chamber 410, air suction channel 420, surrounding rib 430, upper cover 500, air inlet hole 510, water outlet switching valve 600, water outlet hole column 610, sealing seat 700, water distribution chamber 710, water distribution hole 711, water outlet net 800, water outlet hole 810. Detailed implementation manners

[0031] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0033] Referring to Figures 1-9 , an air suction shower head includes a body 100, a water distribution base 200 and a plug 300. The water distribution base 200 is installed inside the body 100. The water distribution base 200 is provided with a water-gas mixing chamber 210 and a water inlet hole 220 communicating with the water-gas mixing chamber 210. The water inlet hole 220 sequentially includes a water inlet section 223 and an air suction section 224 along the water inlet direction. An air suction hole 221 is formed in the inner wall of the air suction section 224. The plug 300 includes an elastically deformable thin film 320. The thin film 320 is disposed in the air suction section 224, and the shape of the thin film 320 is adapted to the inner wall of the air suction section 224. For example, if the water inlet hole 220 is a circular hole, the shape of the thin film 320 is arc-shaped; if the water inlet hole 220 is a square hole, the shape of the thin film 320 is straight sheet-shaped. When the thin film 320 is not deformed, it can closely adhere to the inner wall of the air suction section 224 to close the air suction hole 221. After the water flow passes through the water inlet section 223, a water column can be formed, and there is a distance between the water column and the thin film when it is not deformed. In the water passing state, the thin film 320 can contract inward to open the air suction hole 221. The thin film 320 is made of silica gel material. The number of air suction holes 221 ≥ 2, and they can be arranged on both sides of the water inlet hole 220, or evenly distributed in an annular array around the axis of the water inlet hole 220.

[0034] Working principle: As Figures 5-6As shown (the dotted arrows in the figure indicate the air flow direction, and the solid arrows indicate the water flow direction), when water flows in from the water inlet section 223 and then passes through the thin film 320, the water flow is ejected in a water column shape into the air-water mixing chamber 210. At this time, a negative pressure area will be generated inside the thin film 320. Since there is a distance for the thin film to shrink inward between the thin film and the water column, the thin film 320 can be affected by the external atmospheric pressure and shrink and deform inward, opening the air intake hole 221, sucking in air from the outside, realizing the mixing of air and water to produce bubble water. After the water is turned off, the thin film 320 resets to realize backflow prevention and prevent water leakage from the air hole.

[0035] In some embodiments of the present invention, the plug 300 further includes a fixing seat 310. The fixing seat 310 is annular and is embedded in the water inlet section 223. The inner diameter of the fixing seat is smaller than the inner diameter of the air intake section 224. The two axial ends of the fixing seat 310 are respectively a water inlet end and a water outlet end. The thin film 320 is fixedly connected to the water outlet end of the fixing seat 310. The fixing seat 310 provides a stable installation foundation for the thin film 320. This structure ensures that the thin film 320 can be accurately positioned at a specific position (air intake section 224) inside the water inlet hole 220, enabling it to elastically deform inward under the action of water flow. The thin film 320 and the fixing seat 310 are an integral whole. When installing, the entire plug can be embedded in the water inlet hole 220, which is convenient for disassembly and assembly.

[0036] In some embodiments of the present invention, the thin film 320 is composed of two or more film flaps 321. The film flaps 321 are arranged at intervals along the circumference of the water inlet hole 220. The film flaps 321 can be arc-shaped or straight sheet-shaped. In some embodiments, the film flaps 321 are arc-shaped. Two or more film flaps 321 are arranged in a circular array centered on the axis of the water inlet hole 220 to enclose a non-closed circular area. The inner diameter d1 of this circular area is larger than the inner diameter d2 of the fixing seat 310 (as Figure 5 shown), ensuring that when the water flows through the fixing seat 310 and reaches the air intake section 224, it will not contact the thin film 320, leaving space for the thin film 320 to shrink and deform inward. The design of the film flaps 321 is beneficial to improving the air intake efficiency. If the thin film 320 is in a complete circular ring shape, its stiffness is relatively high, and when deforming, due to its integrity, the bending resistance is large, especially difficult to effectively shrink inward in a small flow or low-pressure environment. The segmented film flaps 321 are narrower and independently movable in structure. The elastic deformation threshold of each film flap 321 is lower, and it can respond more sensitively to the negative pressure generated by the water flow, ensuring that the air intake hole 221 can be opened in time under different water pressures and improving the air intake efficiency. The film flaps 321 arranged at intervals along the circumference can shrink inward evenly, avoiding uneven deformation or jamming of the entire thin film 320 due to local stress concentration.

[0037] In some embodiments of the present invention, a guiding conical surface 311 is formed on the inner wall of the water inlet end of the fixing base 310, and the diameter of the guiding conical surface 311 gradually decreases along the water inlet direction. The tapered structure (diameter reduction) of the conical surface conforms to the hydrodynamic principle, causing the cross-sectional area of the water flow to gradually narrow when entering the water inlet hole 220, and the flow rate to increase. The increase in flow rate will cause the pressure inside the thin film 320 to further decrease, forming a stronger negative pressure area, making it easier for the thin film 320 to contract inward due to the internal and external pressure difference during water flow, ensuring that the air intake holes 221 are opened in a timely and sufficient manner, and improving the air intake efficiency.

[0038] In some embodiments of the present invention, spiral ribs 312 are provided on the inner wall of the fixing base 310 to form a spiral jet channel inside the fixing base 310. The spiral jet channel and the guiding conical surface 311 play a role in increasing the speed and pressure of the fluid, and at the same time can also make the fluid flow orderly, reducing turbulence, noise and energy loss.

[0039] In some embodiments of the present invention, it further includes a cover plate 400. The cover plate 400 covers the upper part of the water-air mixing cavity 210. An air intake cavity 410 is provided on the upper surface of the cover plate 400. At least one air intake hole 510 is opened on the cavity wall of the air intake cavity 410. One end of the air intake cavity 410 is provided with an air intake channel 420. The air intake channel 420 is located above the air intake section 224. The air intake channel 420 communicates with the air intake cavity 410 and the air intake holes 221, and the air intake holes 510 are far away from the air intake channel 420. The cover plate 400 is welded to the cavity wall of the water-air mixing cavity 210. The air intake holes 510 communicate with the internal environment of the shower head. The air intake cavity 410 is a long and narrow structure. The air intake channel 420 is located at one end in the length direction of the air intake cavity 410, and at least one air intake hole 510 is located at the other end in the length direction of the air intake cavity 410. Existing air intake shower heads, especially handheld shower heads, have problems such as weak jet force and high noise. The present invention adopts a water-air channel separation structure. Through physical isolation, an air intake cavity 410 is set up between the air inside the shower head and the air intake holes 221 as a buffer zone, which can effectively reduce the noise problem generated by the shower head during air intake. In addition, in the case of the non-return failure of the thin film 320, the air intake cavity 410 is also a protective barrier against water leakage from the air intake holes 221. Since the air intake cavity 410 is a long and narrow structure, the air intake holes 221 are far away from the air intake holes 510. The air intake cavity 410 can allow a small amount of backflow residual water to stay at the bottom of the air intake cavity 410, and the residual water will be sucked into the water-air mixing cavity 210 by negative pressure during the next water flow, as Figure 8 shown (the dotted arrows in the figure are the air flow directions, and the solid arrows are the water flow directions).

[0040] In some embodiments of the present invention, it further includes an upper cover 500. A surrounding rib 430 is provided on the upper surface of the cover plate 400. The upper cover 500 covers the area surrounded by the surrounding rib 430 to form a suction cavity 410. An air inlet hole 510 is opened on the upper cover 500. The cover plate 400 and the surrounding rib 430 are welded together to form a closed suction cavity 410. The shower head is horizontally downward or vertically used in 80% of cases, and the inverted situation rarely occurs. The air inlet hole 510 is provided on the upper cover 500, making the air inlet hole 510 face upward, opposite to the direction of the water outlet hole 810 of the shower head, reducing the water leakage of the air inlet hole 510.

[0041] In some embodiments of the present invention, the width of the suction cavity 410 in the up and down direction gradually increases along the air flow direction. Relative to the straight wall, the suction cavity 410 is conical, and the cavity wall gradually expands outward along the air flow direction, which can significantly reduce the frictional resistance between the air flow and the cavity wall, reduce the pressure loss, and thus reduce the noise. Moreover, the conical design can store more water leaked from the suction holes 221 to prevent the water from flowing back through the air inlet hole 510.

[0042] In some embodiments of the present invention, the inner wall surfaces of the suction cavity 410 and the suction channel 420 are coated with a hydrophobic coating. The superhydrophobic coating (contact angle > 150°) makes the inhaled trace water mist roll down in a spherical shape, avoiding the formation of a water film or the accumulation of liquid droplets. The continuous hydrophobic surface can reduce the viscous effect between the air flow and the cavity wall, making the air flow velocity distribution more uniform. The hydrophobic coating can increase the proportion of the air flow core area from 65% to 85%, reducing the whistling caused by the boundary layer separation. Further, the suction holes 221 and the air inlet hole 510 are mirror polished. The polished smooth surface can improve the stability of the air flow boundary layer and avoid the wall vibration of the suction holes 221 caused by the air flow separation.

[0043] In some embodiments of the present invention, it further includes a water outlet switching valve 600 for switching the water outlet mode of the shower head. The water outlet switching valve 600 is installed inside the handle of the main body 100. The water outlet switching valve 600 includes a valve body and a button assembly. A water outlet hole column 610 is provided on the valve body. The water outlet hole column 610 is embedded in the water inlet hole 220, and the water outlet hole column 610 is docked with the water inlet end of the fixed seat 310. The proportional relationship between the cross-sectional area A1 of the water outlet hole column 610 and the minimum projected area A2 of the spiral injection channel satisfies A1 ≥ 4 * A2. Taking the flow velocity at the water outlet hole column 610 as V1 and the flow velocity at the spiral injection channel as V2, according to the principle of flow conservation and Bernoulli equation, and given that A1 ≥ 4 * A2, it is deduced that V2 ≥ 4 * V1. When the water flow is input from the water outlet hole column 610 and passes through the spiral injection channel, the water flow is sprayed into the water-air mixing cavity 210 at a multiple speed, generating a large negative pressure inside the inner side of the film 320. According to theoretical and practical verification, when A1 ≥ 4 * A2, the suction holes 221 do not leak water and the suction efficiency is good. The structure of the water outlet switching valve 600 can refer to the patent CN219317693U.

[0044] In some embodiments of the present invention, it further includes a sealing seat 700 and a water outlet net 800. The sealing seat 700 is connected to the lower part of the water distribution seat 200. There are several water discharge grooves 230 provided on the water-gas mixing cavity 210. A water distribution cavity 710 is provided on the sealing seat 700. The water distribution cavity 710 is communicated with the water discharge grooves 230. There are several water distribution holes 711 provided at the bottom of the water distribution cavity 710. The water outlet net 800 is arranged below the sealing seat 700. Water outlet holes 810 are provided on the water outlet net 800. A water distribution space for the bubble water to flow is formed between the sealing seat 700 and the water outlet net 800. The water distribution holes 711 are communicated with the water outlet holes 810 through the water distribution space. A water retaining rib 222 is provided along the circumferential direction of the water outlet end of the water inlet hole 220. The water passing area of the water retaining rib 222 is A3. The total water passing area of all the water discharge grooves 230 is A4. The total water passing area of all the water distribution holes 711 is A5. The total water passing area of all the water outlet holes 810 is A6. Let A4 > A5 > A6 > A3 > A2. The water inlet hole 220, the water-gas mixing cavity 210, the water discharge grooves 230, the water distribution cavity 710, the water distribution holes 711 and the water outlet holes 810 form a closed water path chain. The relationship between the nodes in the chain satisfies A4 > A5 > A6 > A3 > A2, which can make the pressure loss smaller when the water flows through each node, ensure that the terminal water outlet of the shower head has a strong jet force, and can meet the shower experience of consumers. The function of the water retaining rib 222 is to prevent the fluid from flowing back to the negative pressure area along the side wall of the water-gas mixing cavity 210, so as not to affect the air suction efficiency. Specifically, there are 10 water discharge grooves 230, which are distributed in a circular array on the edge of the water-gas mixing cavity 210. The water distribution cavity 710 is a non-closed ring, and its position is opposite to the water discharge grooves 230. There are 12 water distribution holes 711, which are evenly arranged at the bottom of the water distribution cavity 710. There are 40 water outlet holes 810, which are evenly arranged on the water outlet net 800.

[0045] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air suction shower head, characterized in that, It includes a main body (100), a water distribution base (200) and a plug (300). The water distribution base (200) is installed inside the main body (100). A water-gas mixing cavity (210) and a water inlet hole (220) communicating with the water-gas mixing cavity (210) are provided on the water distribution base (200). The water inlet hole (220) sequentially includes a water inlet section (223) and an air suction section (224) along the water inlet direction. An air suction hole (221) is formed on the inner wall of the air suction section (224). The plug (300) includes an elastically deformable film (320). The film (320) is arranged in the air suction section (224). The film (320) is adapted to the inner wall of the air suction section (224). When the film (320) is not deformed, it can closely adhere to the inner wall of the air suction section (224) to close the air suction hole (221). After water flows through the water inlet section (223), a water column can be formed, and there is a distance between the water column and the film when it is not deformed. Under the water passing state, the film (320) can shrink inward to open the air suction hole (221).

2. The suction shower head according to claim 1, wherein, The film (320) is composed of two or more film flaps (321), and the film flaps (321) are arranged at intervals along the circumferential direction of the water inlet hole (220).

3. The suction shower head according to claim 1, characterized in that, The plug (300) further includes a fixing seat (310). The fixing seat (310) is annular and is embedded in the water inlet section (223). The inner diameter of the fixing seat is smaller than the inner diameter of the air suction section (224). The two axial ends of the fixing seat (310) are respectively a water inlet end and a water outlet end. The film (320) is fixedly connected to the water outlet end of the fixing seat (310).

4. The suction shower head according to claim 3, wherein, A guiding conical surface (311) is formed on the inner wall of the water inlet end of the fixing seat (310), and the diameter of the guiding conical surface (311) gradually decreases along the water inlet direction.

5. The suction shower head according to claim 3 or 4, characterized in that, Spiral ribs (312) are provided on the inner wall of the fixing seat (310) so as to form a spiral injection channel inside the fixing seat (310).

6. The suction shower head according to claim 1, wherein It further includes a cover plate (400). The cover plate (400) covers above the water-gas mixing cavity (210). An air suction cavity (410) is provided on the upper surface of the cover plate (400). At least one air inlet hole (510) is formed on the cavity wall of the air suction cavity (410). One end of the air suction cavity (410) is provided with an air suction channel (420). The air suction channel (420) is located above the air suction section (224). The air suction channel (420) communicates the air suction cavity (410) and the air suction hole (221), and the air inlet hole (510) is far away from the air suction channel (420).

7. The suction shower head according to claim 6, wherein It further includes an upper cover (500). A surrounding rib (430) is provided on the upper surface of the cover plate (400). The upper cover (500) covers the area surrounded by the surrounding rib (430) to form the air suction cavity (410), and the air inlet hole (510) is opened on the upper cover (500).

8. The suction shower head according to claim 6, characterized in that, The width of the air suction cavity (410) in the up-down direction gradually becomes larger along the air flow direction.

9. The suction shower head according to claim 6, characterized in that, The inner wall surfaces of the air suction cavity (410) and the air suction channel (420) are coated with a hydrophobic coating.

10. The suction showerhead according to claim 5, wherein It further includes a water outlet switching valve (600) for switching the water outlet mode of the shower head. The water outlet switching valve (600) is installed inside the handle of the body (100). The water outlet switching valve (600) includes a valve body and a button assembly. The valve body is provided with a water outlet hole column (610). The water outlet hole column (610) is embedded in the water inlet hole (220), and the water outlet hole column (610) is docked with the water inlet end of the fixed seat (310). The ratio of the water passing area A1 of the water outlet hole column (610) to the minimum projected area A2 of the spiral injection hole channel satisfies A1≥4*A2.

11. The suction shower head according to claim 10, characterized in that, It further includes a sealing seat (700) and a water outlet net (800). The sealing seat (700) is connected below the water distribution seat (200). A plurality of water discharge grooves (230) are provided on the water and gas mixing cavity (210). The sealing seat (700) is provided with a water distribution cavity (710). The water distribution cavity (710) is communicated with the water discharge grooves (230). A plurality of water distribution holes (711) are provided at the bottom of the water distribution cavity (710). The water outlet net (800) is arranged below the sealing seat (700). The water outlet net (800) is provided with water outlet holes (810). A water distribution space for the flow of bubble water is formed between the sealing seat (700) and the water outlet net (800). The water distribution holes (711) are communicated with the water outlet holes (810) through the water distribution space. A water retaining rib (222) is provided along the circumferential direction of the water inlet end of the water inlet hole (220). The water passing area of the water retaining rib (222) is A3. The total water passing area of all the water discharge grooves (230) is A4. The total water passing area of all the water distribution holes (711) is A5. The total water passing area of all the water outlet holes (810) is A6. Let A4>A5>A6>A3>A2.

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