Water-air mixing spray head

Abstract

The invention discloses a water-air mixing spray head. The method comprises the steps that a first quick plug, a second quick plug and a connecting body are integrally arranged, and a connecting cavity is formed in the connecting body; the aperture of the water outlet end in the transition body is smaller than that of the water inlet end; an air passing hole is formed in the transition body and is communicated with the air inlet hole; the water inlet end is communicated with the connecting cavity; the transition body is hermetically connected with the body; the nozzle is provided with a ball head provided with spraying holes. The nozzle is detachably connected with the transition body; a water-air mixing hole is formed in the nozzle, the water outlet end extends into the water-air mixing hole, a gap exists between the outer wall of the water outlet end and the inner wall of the water-air mixing hole, and the air passing hole is communicated with the water-air mixing hole through the gap. The spraying device can be directly connected with a pipeline, unnecessary connecting pieces are reduced, the spraying efficiency is improved, and the connecting mode is optimized.

Description

Technical Field

[0001] The invention belongs to the field of air-water mixing devices, and in particular relates to a water-air mixing spray head. Background Art

[0002] Coal mine underground operations, bolting and spraying operations, and fully mechanized mining face operations generate a lot of dust and harmful gases, which make it impossible for workers to work normally and endanger their health. Failure to reduce dust in time will affect production safety. Using water mist nozzles can effectively reduce dust and harmful gases during underground coal mine operations.

[0003] However, in deep well operations, the environment and operating conditions are very harsh, including high pressure, limited space and complex operating environment. Ordinary water mist nozzles are not suitable for deep well operations.

[0004] The water inlet and air inlet interfaces of the existing water-air mixing spray heads are both internally threaded ports. During installation and replacement, they need to be connected to a quick plug with an external thread in order to be connected to the spray pipe. This threaded connection method has poor pressure resistance and has additional connectors. The increase in connection points also increases potential sources of failure, reducing system reliability. At the same time, the installation and disassembly steps are complicated and are not suitable for deep well operations with very limited space. The addition of connectors will also increase resistance to water and air flow, reducing spray efficiency. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and propose a water-air mixing spray head that can be directly connected to a pipeline, reduce unnecessary connectors, reduce resistance to water flow and air flow, improve spray efficiency, optimize the connection method, improve pressure resistance, enhance system reliability, and simplify the installation and disassembly steps. It is suitable for deep well operations and optimizes the spray effect.

[0006] To achieve the above objectives, the present invention proposes the following technical solutions: A water-air mixing spray head comprises a main body, a transition body and a nozzle.

[0007] The main body includes an integrally arranged connector, a first quick plug and a second quick plug. The first quick plug and the second quick plug are arranged on both sides of the connector. A connecting cavity is arranged on the connector. The first quick plug is communicated with the inside of the connecting cavity for water intake, and an air inlet hole is arranged in the second quick plug.

[0008] The transition body is provided with a through hole, and the two ends of the through hole are respectively a water outlet end and a water inlet end, and the aperture of the water outlet end is smaller than the aperture of the water inlet end; the transition body is provided with an air hole, and the air hole is communicated with the air inlet hole; the water inlet end of the transition body is communicated with the connecting cavity, and the transition body is sealed and connected to the main body.

[0009] The nozzle is provided with a ball head, the ball head is provided with spray holes, the nozzle is provided with a water-air mixing hole, the water-air mixing hole is communicated with the spray hole; the nozzle is detachably connected to the transition body.

[0010] The water outlet end extends into the water-air mixing hole and is connected thereto, and the extending height of the water outlet end in the water-air mixing hole is 0.1 to 0.3 of the height of the water-air mixing hole; there is a gap between the outer wall of the water outlet end and the inner wall of the water-air mixing hole, and the air hole is connected to the water-air mixing hole via the gap, and water and air are mixed in the water-air mixing hole and sprayed out via the spray hole after mixing.

[0011] Preferably, the ratio of the water inlet cross-sectional area to the air inlet cross-sectional area in the water-air mixing hole is 6~7:3~4, that is, the water-air mixing ratio, and the hole cross-sectional area of ​​the water outlet end is 0.04~0.06 of the water inlet cross-sectional area of ​​the first quick plug, that is, the water-inlet ratio; the air inlet cross-sectional area of ​​the water-air mixing hole is 0.05~0.07 of the air inlet cross-sectional area of ​​the second quick plug, that is, the air-outlet ratio.

[0012] Preferably, the water pressure of the water entering the first quick plug is 2-7 MPa, and the wind pressure of the air entering the second quick plug is 0.4-0.8 MPa.

[0013] Preferably, the water-air mixing ratio in the water-air mixing hole is 6.7:3.3, which further optimizes the spray effect; the hole cross-sectional area of ​​the water outlet end is 0.05 of the water inlet cross-sectional area of ​​the first quick plug; the air inlet cross-sectional area of ​​the water-air mixing hole is 0.06 of the air inlet cross-sectional area of ​​the second quick plug, which further optimizes the spray effect.

[0014] Preferably, a fourth annular groove is provided on the outer wall of the body near the two ports, and an O-ring is provided in the fourth annular groove, so that a multi-nozzle spray group can be directly assembled using a KJ standard straight or three-way connection.

[0015] Preferably, the first quick plug, the second quick plug and the body are formed by welding or integral processing. Preferably, a water inlet step hole is provided inside the first quick plug, and the aperture of the water inlet step hole decreases from large to small from the outside to the inside, and the inner end of the water inlet step hole is connected to the connecting cavity, and the inner end aperture of the water inlet step hole is 0.5-0.8 of the outer end aperture; the aperture of the water inlet end of the transition body is not larger than the inner end aperture of the water inlet step hole, and the aperture of the water outlet end is 0.05-0.15 of the aperture of the water inlet end; the water inlet end and the water outlet end in the transition body are transitioned by a stepped hole, and the aperture gradually decreases from the water inlet end to the water outlet end.

[0016] Preferably, an air inlet expansion hole is provided in the second quick plug, and the air inlet hole is connected with the air passage hole via the air inlet expansion hole. The aperture of the air inlet expansion hole is larger than the air inlet hole, and the aperture of the air inlet expansion hole is 1.5~2.5 of the air inlet hole; the air passage hole is circumferentially arranged around the water outlet end, and the air passage hole is an inclined hole with an inclination angle of 3~10°, which gradually retracts inward from bottom to top.

[0017] Preferably, the water inlet end of the transition body is threadedly connected to the inner wall of the connecting cavity.

[0018] Preferably, the connector is provided with a circle of first annular grooves on the periphery of the connecting cavity, and the first annular groove is communicated with the air inlet expansion hole; the bottom end of the transition body is provided with a circle of second annular grooves, and the second annular grooves are communicated with the air holes, and the second annular grooves are aligned and communicated with the first annular grooves.

[0019] Preferably, a sealing gasket is provided at the connection between the transition body and the main body, and a through third annular groove is opened on the sealing gasket. The third annular groove of the sealing gasket is placed between the first annular groove and the second annular groove. The air hole is connected to the air inlet expansion hole via the second annular groove, the third annular groove and the first annular groove.

[0020] Preferably, the water outlet end is coaxially arranged with the water-air mixing hole, so that the gap between the water outlet end and the inner wall of the water-air mixing hole is uniform, and the wind passing through the air hole enters the water-air mixing hole uniformly, thereby optimizing the water-gas mixing effect and optimizing the atomization effect.

[0021] Preferably, a cavity is opened at the bottom of the nozzle, the cavity is connected with the water-air mixing hole, and the minimum diameter of the cavity is consistent with the aperture of the water-air mixing hole; the air hole of the transition body is connected with the cavity, and the gas in the air hole enters the cavity for concentration, and then enters the water-air mixing hole to mix with water to form water mist.

[0022] Preferably, the cavity at the bottom of the nozzle is a conical cavity, and the inner diameter gradually decreases from bottom to top; a conical expansion platform is provided at the top of the transition body, and the height of the conical expansion platform is 0.3~0.5 of the height of the conical cavity; the outlet of the air hole is provided on the conical expansion platform, and the conical expansion platform extends into the cavity and the inner wall of the conical cavity and the outer wall of the conical expansion platform are gap-matched, thereby optimizing the connection between the transition body and the nozzle.

[0023] Preferably, a third expansion platform is provided on the transition body, the outer diameter of the third expansion platform is smaller than the outer diameter of the first expansion platform, the outlet of the air hole is provided on the third expansion platform, and the third expansion platform is placed above the first expansion platform; the height of the third expansion platform is 0.5~0.6 of the height of the circular inner wall; a section of circular inner wall is provided at the bottom of the cavity; the inner diameter of the circular inner wall matches the outer diameter of the third expansion platform, the third expansion platform extends into the circular inner wall, and the outer wall of the third expansion platform matches the gap between the circular inner wall.

[0024] Preferably, it also includes a pressing screw, and the nozzle is connected to the transition body through the pressing screw. The transition body is provided with a first expansion platform, and the first expansion platform is provided with a first external thread; the bottom end of the nozzle is provided with a second expansion platform, and the outer diameter of the second expansion platform is consistent with the outer diameter of the first expansion platform; the pressing screw is provided with an internal thread, and the internal thread of the pressing screw is threadedly connected with the first external thread, and the upper end of the pressing screw is provided with an internal pressing platform, and the inner diameter of the internal pressing platform is smaller than the minor diameter of the internal thread. The internal pressing platform is tightly sleeved on the nozzle and placed on the second expansion platform, thereby realizing the connection between the nozzle and the transition body.

[0025] Preferably, the second expansion platform is provided with a second external thread, and the second external thread is threadably connected to the internal thread.

[0026] Preferably, the spray holes are inclined holes, tilted outward from bottom to top; the spray holes are evenly distributed circumferentially around the axis of the ball head; the spray holes are arranged in more than two circles on the ball head, and the inclination angle of the spray holes in the inner circle is smaller than the inclination angle of the spray holes in the outer circle.

[0027] Specifically, during spraying, pressurized water enters the water-air mixing hole through the first quick plug, the connecting cavity of the main body, the water inlet end and the water outlet end of the transition body, and at the same time, compressed air enters the water-air mixing hole through the second quick plug, the air hole, and the gap between the water outlet end and the water-air mixing hole. After the pressurized water and compressed air are mixed, they are sprayed out from the spray hole on the ball head to form high-pressure water mist to reduce and remove dust.

[0028] Among them, the water-air mixing ratio, the water inlet and outlet ratio, and the air inlet and outlet ratio play a key role in the operation of the spray head.

[0029] Among them, if the proportion of air in the water-air mixture is too high, the atomization will be too fine and the atomization effect will be poor. If the water proportion is too high, the atomization degree may not be high, the spray distance of the spray will not be enough, and the atomization effect will also be poor.

[0030] Among them, if the ratio of water inlet to outlet is too small, the spray volume will be reduced. If the ratio of water inlet to outlet is too small, the internal pressure of the spray head will be too high, which will affect the normal use of the spray head and cause certain energy consumption.

[0031] Among them, the size of the air inlet and outlet ratio will affect the spray distance and coverage area of ​​the spray. If the air inlet and outlet ratio is too small, the spray distance of the spray will be reduced. If the air inlet and outlet ratio is too large, the internal pressure of the spray head will be too high, which will affect the normal use of the spray head and cause certain energy consumption.

[0032] Therefore, choosing the appropriate water-air mixing ratio, water inlet and outlet ratio, and air inlet and outlet ratio is crucial to the spray effect of the spray head.

[0033] The beneficial effects of the present invention are: The present invention forms an integrated main body by integrating the connector with the first quick plug and the second quick plug, thereby optimizing the connection method, reducing unnecessary intermediate transition connectors, saving raw materials and processing and assembly time of connectors, simplifying the installation and disassembly steps, and standardizing the assembly for easy promotion and management; at the same time, it reduces the resistance to water flow and air flow, improves the spray efficiency, improves the pressure resistance performance, and enhances the system reliability, and can be suitable for deep well operations.

[0034] The present invention forms a complete spray head through a body, a transition body and a nozzle. The first quick plug of the body is connected to the water supply system, and the second quick plug is connected to the air supply system. After the pressurized water and compressed air are mixed in the nozzle, they are sprayed out from the spray hole on the ball head to form high-pressure water mist, which plays the role of dust reduction and dust removal.

[0035] The present invention adjusts the spray dust reduction effect of the spray head to the optimum by adjusting the water-air mixing ratio, the water-inlet and water-outlet ratio, and the air-inlet and air-outlet ratio, thereby optimizing the spray effect.

[0036] By adopting the above scheme, the present invention reduces unnecessary connecting parts, reduces the resistance to water flow and air flow, improves the spray efficiency, optimizes the connection method, improves the pressure resistance performance, and enhances the system reliability, while simplifying the installation and disassembly steps, is suitable for deep well operations, and optimizes the spray effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0039] Figure 2 It is a cross-sectional view of the main body in the present invention.

[0040] Figure 3 It is a top view of the main body in the present invention.

[0041] Figure 4 It is a side view of the main body in the present invention.

[0042] In the figure, 1-O-ring; 2-body; 3-sealing pad; 4-nozzle; 5-pressing screw; 6-transition body; 21-first quick plug; 22-second quick plug; 23-first annular groove; 24-connecting body; 211-water inlet step hole; 221-air inlet hole; 222-air inlet expansion hole; 41-ball head, 42-second expansion, 43-spray hole, 44-water-air mixing hole; 61-water outlet; 62-water inlet; 63-air hole; 64-second annular groove, 65-first expansion. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0045] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] First embodiment: like Figures 1 to 4 As shown, a water-air mixing spray head includes a main body 2, a transition body 3 and a nozzle 4.

[0048] The main body 2 includes an integrally arranged connecting body 24, a first quick plug 21 and a second quick plug 22. The first quick plug 21 and the second quick plug 22 are arranged on both sides of the connecting body 24. A connecting cavity is provided on the connecting body 24. The first quick plug 21 is communicated with the inside of the connecting cavity for water intake, and an air inlet hole 221 is provided in the second quick plug 22.

[0049] A through hole is provided in the transition body 6, and the two ends of the through hole are respectively a water outlet end 61 and a water inlet end 62, and the aperture of the water outlet end 61 is smaller than the aperture of the water inlet end 62; an air hole 63 is provided on the transition body 6, and the air hole 63 is communicated with the air inlet hole 221; the water inlet end 62 of the transition body 6 is communicated with the connecting cavity, and the transition body 6 is sealed and connected to the main body 2.

[0050] The nozzle 4 is provided with a ball head 41 , on which spray holes 43 are arranged. The nozzle 4 is provided with a water-air mixing hole 44 , which is communicated with the spray hole 43 . The nozzle 4 is detachably connected to the transition body 6 .

[0051] The water outlet end 61 extends into the water-air mixing hole 44 and is connected thereto. The extending height of the water outlet end 61 in the water-air mixing hole 44 is 0.1 to 0.3 of the height of the water-air mixing hole 44. There is a gap between the outer wall of the water outlet end 61 and the inner wall of the water-air mixing hole 44. The air hole 63 is connected to the water-air mixing hole 44 via the gap. Water and air are mixed in the water-air mixing hole 44 and are sprayed out via the spray hole 43 after mixing.

[0052] The ratio of the water inlet cross-sectional area to the air inlet cross-sectional area in the water-air mixing hole 44 is 6-7:3-4, that is, the water-air mixing ratio.

[0053] The hole cross-sectional area of ​​the water outlet end 61 is 0.04-0.06 of the water inlet cross-sectional area of ​​the first quick plug 21, that is, the water outlet to inlet ratio; the air inlet cross-sectional area of ​​the water-air mixing hole 44 is 0.05-0.07 of the air inlet cross-sectional area of ​​the second quick plug 22, that is, the air outlet to inlet ratio.

[0054] Second embodiment: The difference from the first embodiment is that the ratio of the water inlet cross-sectional area to the air inlet cross-sectional area in the water-air mixing hole 44 is 7:3, that is, the water-air mixing ratio.

[0055] Third embodiment: The difference from the first embodiment is that the ratio of the water inlet cross-sectional area to the air inlet cross-sectional area in the water-air mixing hole 44 is 6:4, that is, the water-air mixing ratio.

[0056] Fourth embodiment: The difference from the first embodiment is that the hole cross-sectional area of ​​the water outlet 61 is 0.04 of the water inlet cross-sectional area of ​​the first quick plug 21 , that is, the water outlet to water inlet ratio.

[0057] Fifth embodiment: The difference from the first embodiment is that the hole cross-sectional area of ​​the water outlet 61 is 0.06 of the water inlet cross-sectional area of ​​the first quick plug 21 , that is, the water outlet to water inlet ratio.

[0058] Sixth embodiment: The difference from the first embodiment is that the ratio of the air inlet cross-sectional area of ​​the water-air mixing hole 44 to the air inlet cross-sectional area of ​​the second quick plug 22 is 0.05, that is, the air inlet-outlet ratio.

[0059] Seventh embodiment: The difference from the first embodiment is that the ratio of the air inlet cross-sectional area of ​​the water-air mixing hole 44 to the air inlet cross-sectional area of ​​the second quick plug 22 is 0.07, that is, the air inlet-outlet ratio.

[0060] According to the first to seventh embodiments, the following comparative examples are set: The first comparison: The difference from the first embodiment is that the ratio of the water inlet cross-sectional area to the air inlet cross-sectional area in the water-air mixing hole 44 is 5:5, that is, the water-air mixing ratio.

[0061] Second comparison: The difference from the first embodiment is that the ratio of the water inlet cross-sectional area to the air inlet cross-sectional area in the water-air mixing hole 44 is 5.5:4.5, that is, the water-air mixing ratio.

[0062] The third comparison ratio: The difference from the first embodiment is that the ratio of the water inlet cross-sectional area to the air inlet cross-sectional area in the water-air mixing hole 44 is 7.5:2.5, that is, the water-air mixing ratio.

[0063] The fourth comparison ratio: The difference from the first embodiment is that the ratio of the water inlet cross-sectional area to the air inlet cross-sectional area in the water-air mixing hole 44 is 8:2, that is, the water-air mixing ratio.

[0064] Fifth comparison ratio: The difference from the first embodiment is that the hole cross-sectional area of ​​the water outlet 61 is 0.02 of the water inlet cross-sectional area of ​​the first quick plug 21 , that is, the water outlet to water inlet ratio.

[0065] Sixth comparison ratio: The difference from the first embodiment is that the hole cross-sectional area of ​​the water outlet 61 is 0.03 of the water inlet cross-sectional area of ​​the first quick plug 21 , that is, the water outlet to water inlet ratio.

[0066] Seventh comparison ratio: The difference from the first embodiment is that the hole cross-sectional area of ​​the water outlet 61 is 0.07 of the water inlet cross-sectional area of ​​the first quick plug 21 , that is, the water outlet to water inlet ratio.

[0067] Eighth comparison ratio: The difference from the first embodiment is that the hole cross-sectional area of ​​the water outlet 61 is 0.08 of the water inlet cross-sectional area of ​​the first quick plug 21 , that is, the water outlet to water inlet ratio.

[0068] Ninth comparison ratio: The difference from the first embodiment is that the ratio of the air inlet cross-sectional area of ​​the water-air mixing hole 44 to the air inlet cross-sectional area of ​​the second quick plug 22 is 0.03, that is, the air inlet-outlet ratio.

[0069] Tenth comparison ratio: The difference from the first embodiment is that the ratio of the air inlet cross-sectional area of ​​the water-air mixing hole 44 to the air inlet cross-sectional area of ​​the second quick plug 22 is 0.04, that is, the air inlet-outlet ratio.

[0070] Eleventh pair of proportions: The difference from the first embodiment is that the ratio of the air inlet cross-sectional area of ​​the water-air mixing hole 44 to the air inlet cross-sectional area of ​​the second quick plug 22 is 0.08, that is, the air inlet-outlet ratio.

[0071] The twelfth comparison ratio: The difference from the first embodiment is that the ratio of the air inlet cross-sectional area of ​​the water-air mixing hole 44 to the air inlet cross-sectional area of ​​the second quick plug 22 is 0.09, that is, the air inlet-outlet ratio.

[0072] According to the first to seventh embodiments and the first to twelfth comparative examples, the following experiments were conducted: The spray coverage area of ​​the spray head is set to a circular surface, the water pressure is 5 MPa, the wind pressure is 0.6 MPa, the flow rate is constant, and other conditions are the same. The spray effects of the spray head in the first to seventh embodiments and the first to twelfth comparative examples are tested, including the spray distance and the coverage radius.

[0073] Table 1 Test data of the first to seventh embodiments

[0074] Table 2 Test data of the first to twelfth comparative examples

[0075] From the comparison between Table 1 and Table 2, it can be seen that when the first to third embodiments are compared with the first to fourth comparative examples, when the water-air mixing ratio is 6-7:3-4, the spray distance of the spray head is stable at 5.3-5.6m, and the coverage radius is stable at 0.62-0.65m; when other conditions remain unchanged, when the proportion of water in the water-air mixing ratio is lower than 6 and higher than 7, the spray distance of the spray head is lower than 5m, and the coverage radius is lower than 0.6m.

[0076] By comparing the first, fourth to fifth embodiments with the fifth to eighth comparison examples, it can be learned that: when other conditions remain unchanged, when the inlet and outlet water ratio is 0.04-0.06, the spray distance of the spray head is stable at 5.4-5.6m, and the coverage radius is stable at 0.61-0.65m; when the inlet and outlet water ratio is lower than 0.04 and higher than 0.06, the spray distance is lower than 5m, and the coverage radius is lower than 0.53m.

[0077] By comparing the first, sixth to seventh embodiments with the eighth to twelfth comparative examples, it can be learned that: when other conditions remain unchanged, when the air-inlet and outlet air-outlet ratio is 0.05-0.07, the spray distance of the spray head is stable at 5.4-5.6m, and the coverage radius is stable at 0.63-0.65m; when the air-inlet and outlet air-outlet ratio is lower than 0.05 and higher than 0.07, the spray distance is lower than 4.6m, and the coverage radius is lower than 0.5m.

[0078] In summary, when the water-air mixing ratio is 6~7:3~4, the inlet-outlet water ratio is 0.04~0.06, and the inlet-outlet air ratio is 0.05~0.07, the spray effect of the spray head is better. Among them, the spray effect of the spray head is optimal when the water-air mixing ratio is 6.7:3.3, the inlet-outlet water ratio is 0.05, and the inlet-outlet air ratio is 0.06.

[0079] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water-air mixed spray head, characterized in that: The invention comprises a body, a transition body and a nozzle, wherein the body comprises an integrally arranged connecting body, a first quick plug and a second quick plug, the first quick plug and the second quick plug are arranged on both sides of the connecting body, and a connecting cavity is arranged on the connecting body; the first quick plug is communicated with the inside of the connecting cavity, and an air inlet hole is arranged in the second quick plug; a through hole is arranged in the transition body, and the two ends of the through hole are respectively a water outlet end and a water inlet end, and the aperture of the water outlet end is smaller than the aperture of the water inlet end; an air through hole is arranged on the transition body, and the air through hole is communicated with the air inlet hole; the water inlet end of the transition body is communicated with the connecting cavity, and the transition body is sealed and connected with the body; the nozzle is detachably connected with the transition body; a ball head is arranged on the nozzle, and spray holes are arranged on the ball head; a water-air mixing hole is arranged in the nozzle, and the water-air mixing hole is communicated with the spray hole; the water outlet end extends into the water-air mixing hole, and the extending height of the water outlet end in the water-air mixing hole is 0.1-0.3 of the height of the water-air mixing hole; there is a gap between the outer wall of the water outlet end and the inner wall of the water-air mixing hole, and the air through hole is communicated with the water-air mixing hole through the gap.

2. A water-air mixed spray head according to claim 1, characterized in that: The ratio of the water inlet cross-sectional area to the air inlet cross-sectional area in the water-air mixing hole, i.e., the water-air mixing ratio, is 6~7:3~4; the hole cross-sectional area of ​​the water outlet end is 0.04~0.06 of the water inlet cross-sectional area of ​​the first quick plug; the ratio of the air inlet cross-sectional area of ​​the water-air mixing hole to the air inlet cross-sectional area of ​​the second quick plug is 0.05~0.07; the water pressure of the water inlet at the first quick plug is 2~7Mpa, and the wind pressure of the air inlet at the second quick plug is 0.4~0.8Mpa.

3. The water-air mixed spray head according to claim 1, characterized in that: A water inlet step hole is provided in the first quick plug, and the aperture of the water inlet step hole decreases from large to small from the outside to the inside, and the inner end of the water inlet step hole is communicated with the connecting cavity, and the inner end aperture of the water inlet step hole is 0.5-0.8 of the outer end aperture; the aperture of the water inlet end of the transition body is not larger than the inner end aperture of the water inlet step hole, and the aperture of the water outlet end is 0.05-0.15 of the aperture of the water inlet end; the water inlet end and the water outlet end in the transition body are transitioned by a stepped hole, and the aperture gradually decreases from the water inlet end to the water outlet end.

4. The water-air mixed spray head according to claim 1, characterized in that: An air inlet expansion hole is provided in the second quick plug, and the air inlet hole is communicated with the air passage hole via the air inlet expansion hole. The aperture of the air inlet expansion hole is larger than that of the air inlet hole, and the aperture of the air inlet expansion hole is 1.5~2.5 of that of the air inlet hole; the air passage hole is circumferentially arranged around the water outlet end, and the air passage hole is an inclined hole with an inclination angle of 3~10°, which gradually retracts inward from bottom to top.

5. The water-air mixed spray head according to claim 1, characterized in that: The connecting body is provided with a circle of first annular grooves on the periphery of the connecting cavity, and the first annular groove is communicated with the air inlet expansion hole; the bottom end of the transition body is provided with a circle of second annular grooves, and the second annular grooves are communicated with the air through hole, and the second annular grooves are aligned and communicated with the first annular grooves; a sealing gasket is provided at the connection between the transition body and the main body, and a through third annular groove is opened on the sealing gasket, and the third annular groove of the sealing gasket is placed between the first annular groove and the second annular groove.

6. The water-air mixed spray head according to claim 1, characterized in that: It also includes a pressing screw, and the nozzle is connected to the transition body through the pressing screw. The transition body is provided with a first expansion platform, and the first expansion platform is provided with a first external thread; the bottom end of the nozzle is provided with a second expansion platform, and the outer diameter of the second expansion platform is consistent with the outer diameter of the first expansion platform; the pressing screw is provided with an internal thread, and the internal thread of the pressing screw is threadedly connected with the first external thread, and the upper end of the pressing screw is provided with an inner pressing platform, and the inner diameter of the inner pressing platform is smaller than the minor diameter of the internal thread, and the inner pressing platform is tightly sleeved on the nozzle and placed on the second expansion platform.

7. The water-air mixed spray head according to claim 1, characterized in that: A cavity is formed at the bottom of the nozzle, the cavity is communicated with the water-air mixing hole, and the minimum diameter of the cavity is consistent with the aperture of the water-air mixing hole; the air passing hole of the transition body is communicated with the cavity.

8. The water-air mixed spray head according to claim 2, characterized in that: The water-air mixing ratio in the water-air mixing hole is 6.7:3.3; the hole cross-sectional area of ​​the water outlet end is 0.05 of the water inlet cross-sectional area of ​​the first quick plug; the air inlet cross-sectional area of ​​the water-air mixing hole is 0.06 of the air inlet cross-sectional area of ​​the second quick plug.

9. The water-air mixed spray head according to claim 7, characterized in that: The cavity at the bottom of the nozzle is a conical cavity, and the inner diameter gradually decreases from bottom to top; a conical expansion platform is provided at the top of the transition body, and the height of the conical expansion platform is 0.3~0.5 of the height of the conical cavity; the outlet of the air hole is provided on the conical expansion platform, and the conical expansion platform extends into the cavity and the inner wall of the conical cavity and the outer wall of the conical expansion platform are gap-matched.

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