Water-air mixing spray head

Abstract

The utility model 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 spray nozzle can be directly connected with a pipeline, unnecessary connecting pieces are reduced, the spray efficiency is improved, and the connecting mode is optimized.

Description

Technical Field

[0001] This utility model belongs to the field of air-water mixing devices, specifically relating to a water-air mixing spray head. Background Technology

[0002] Coal mine underground operations, anchor spraying operations, and fully mechanized mining faces generate large amounts of dust and harmful gases. These large amounts of dust and harmful gases prevent workers from working normally and endanger their health. Failure to promptly reduce dust will affect safe production. Using water mist nozzles can effectively reduce dust and harmful gases during underground coal mine operations.

[0003] However, deep well operations involve extremely harsh environments and operating conditions, including high pressure, limited space, and complex operating environments, making ordinary water mist nozzles unsuitable for deep well operations.

[0004] Existing water-air mixing spray heads have internally threaded water and air inlets. During installation and replacement, a quick-connect plug with external threads is required to connect to the spray pipeline. This threaded connection method has poor pressure resistance and requires additional connectors, increasing the number of connection points and potential sources of failure, thus reducing system reliability. Furthermore, the installation and disassembly steps are complex, making it unsuitable for deep well operations with very limited space. The added connectors also increase resistance to water and air flow, reducing spray efficiency. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and propose a water-air mixing spray head that can be directly connected to pipelines, reducing unnecessary connecting parts, reducing resistance to water and air flow, improving spray efficiency, optimizing connection methods, improving pressure resistance, enhancing system reliability, and simplifying installation and disassembly steps. It is suitable for deep well operations and optimizes spray effect.

[0006] To achieve the above objectives, the present invention proposes the following technical solution:

[0007] A water-air mixing spray head includes a body, a transition body, and a nozzle.

[0008] The main body includes an integrally formed connector, a first quick plug and a second quick plug, which are located on opposite sides of the connector. The connector has a connecting cavity. The first quick plug communicates with the interior of the connecting cavity for water inlet, and the second quick plug has an air inlet.

[0009] The transition body is provided with a through hole, with a water outlet and a water inlet at both ends, and the diameter of the water outlet is smaller than that of the water inlet; the transition body is provided with an air passage hole, which communicates with the air inlet hole; the water inlet end of the transition body is connected to the connecting cavity, and the transition body is sealed to the main body.

[0010] The nozzle is provided with a ball head, and the ball head is provided with spray holes. The nozzle is provided with a water-air mixing hole, which communicates with the spray holes. The nozzle is detachably connected to the transition body.

[0011] The water outlet extends into and communicates with the water-air mixing hole. The extension height of the water outlet in the water-air mixing hole is 0.1 to 0.3 times the height of the water-air mixing hole. There is a gap between the outer wall of the water outlet and the inner wall of the water-air mixing hole. The air passage hole communicates with the water-air mixing hole through the gap. Water and air are mixed in the water-air mixing hole and then sprayed out through the spray hole.

[0012] 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, i.e., the water-air mixing ratio; the cross-sectional area of ​​the outlet hole is 0.04~0.06 of the water inlet cross-sectional area of ​​the first quick plug, i.e., the water outlet-inlet ratio; and 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, i.e., the air outlet-inlet ratio.

[0013] Preferably, the water pressure at the first quick plug is 2~7 MPa, and the air pressure at the second quick plug is 0.4~0.8 MPa.

[0014] Preferably, the water-air mixing ratio in the water-air mixing hole is 6.7:3.3 to further optimize the spray effect; the cross-sectional area of ​​the water outlet is 0.05 times 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 times the air inlet cross-sectional area of ​​the second quick plug to further optimize the spray effect.

[0015] Preferably, a fourth annular groove is provided on the outer wall of the main 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 KJ standard straight or three-way connectors.

[0016] Preferably, the first quick plug, the second quick plug, and the body are formed by welding or integral processing.

[0017] Preferably, the first quick plug has a water inlet stepped hole, the diameter of which decreases from the outside to the inside, the inner end of which communicates with the connecting cavity, and the inner end diameter of which is 0.5 to 0.8 times the outer end diameter; the diameter of the water inlet end of the transition body is not greater than the inner end diameter of the water inlet stepped hole, and the diameter of the water outlet end is 0.05 to 0.15 times the diameter of the water inlet end; the water inlet end and the water outlet end of the transition body are connected by a stepped hole, and the diameter gradually decreases from the water inlet end to the water outlet end.

[0018] Preferably, the second quick plug is provided with an air inlet expansion hole, which is connected to the air outlet hole. The diameter of the air inlet expansion hole is larger than that of the air inlet hole, and the diameter of the air inlet expansion hole is 1.5 to 2.5 times that of the air inlet hole. The air outlet hole is arranged circumferentially around the water outlet end. The air outlet hole is an oblique hole with an inclination angle of 3 to 10°, and gradually tapers inward from bottom to top.

[0019] Preferably, the water inlet end of the transition body is threadedly connected to the inner wall of the connecting cavity.

[0020] Preferably, the connecting body has a first annular groove around the connecting cavity, and the first annular groove communicates with the air inlet expansion hole; the bottom end of the transition body has a second annular groove, and the second annular groove communicates with the air passage hole, and the second annular groove is aligned and communicates with the first annular groove.

[0021] 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, and the air passage hole communicates with the air inlet expansion hole through the second annular groove, the third annular groove and the first annular groove.

[0022] Preferably, the water outlet is coaxially arranged with the water-air mixing hole, so that the gap between the water outlet and the inner wall of the water-air mixing hole is uniform, and the air in the air passage hole enters the water-air mixing hole evenly, thereby optimizing the water-air mixing effect and the atomization effect.

[0023] Preferably, the nozzle has a cavity at its bottom, which is connected to the water-air mixing hole, and the minimum diameter of the cavity is the same as the diameter of the water-air mixing hole; the air passage of the transition body is connected to the cavity, and the gas in the air passage enters the cavity and concentrates, and then enters the water-air mixing hole to mix with water to form water mist.

[0024] Preferably, the cavity at the bottom of the nozzle is a conical cavity with an inner diameter that gradually decreases from bottom to top; the top of the transition body is provided with a conical expansion platform, the height of which is 0.3 to 0.5 times the height of the conical cavity; the outlet of the air passage is located on the conical expansion platform, which extends into the cavity and the inner wall of the conical cavity is in clearance fit with the outer wall of the conical expansion platform, thereby optimizing the connection between the transition body and the nozzle.

[0025] Preferably, the transition body is provided with a third expansion platform, the outer diameter of the third expansion platform is smaller than the outer diameter of the first expansion platform, the outlet of the air passage is provided on the third expansion platform, and the third expansion platform is positioned above the first expansion platform; the height of the third expansion platform is 0.5 to 0.6 times 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 is clearance-fitted with the circular inner wall.

[0026] Preferably, the system further includes a pressure screw, wherein the nozzle is connected to the transition body via the pressure 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, the outer diameter of the second expansion platform being the same as the outer diameter of the first expansion platform; the pressure screw is provided with an internal thread, the internal thread of the pressure screw being threadedly connected to the first external thread, and the upper end of the pressure screw is provided with an inner pressure platform, the inner diameter of the inner pressure platform being smaller than the minor diameter of the internal thread, the inner pressure platform being tightly fitted onto the nozzle and placed on the second expansion platform, thereby realizing the connection between the nozzle and the transition body.

[0027] Preferably, the second expansion plate is provided with a second external thread, which is threadedly connected to the internal thread.

[0028] Preferably, the spray holes are oblique holes, tilting outwards from bottom to top; the spray holes are evenly distributed circumferentially around the axis of the ball head; the spray holes are arranged in two or more rings on the ball head, and the tilt angle of the spray holes in the inner ring is smaller than the tilt angle of the spray holes in the outer ring.

[0029] 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 and the water outlet of the transition body, while compressed air enters the water-air mixing hole through the second quick plug, the air passage, and the gap between the water outlet and the water-air mixing hole. After the pressurized water and compressed air are mixed, they are sprayed out through the spray hole on the ball head to form a high-pressure water mist, which reduces and removes dust.

[0030] The water-air mixing ratio, water inlet / outlet ratio, and air inlet / outlet ratio play a crucial role in the operation of the spray head.

[0031] If the air ratio in the water-air mixture is too high, the atomization will be too fine and the atomization effect will be poor. If the water ratio is too high, the atomization degree may be low, the spray distance may be insufficient, and the atomization effect will also be poor.

[0032] If the water inlet / outlet ratio is too small, the spray volume will be reduced. If the water inlet / outlet ratio is too small, the internal pressure of the spray head will be too large, which will affect the normal use of the spray head and also cause a certain amount of energy consumption.

[0033] The ratio of air intake to exhaust air affects the spray distance and coverage area. A ratio that is too small will reduce the spray distance, while a ratio that is too large will cause excessive pressure inside the spray head, which will affect the normal use of the spray head and also cause some energy consumption.

[0034] Therefore, choosing the appropriate water-air mixing ratio, water inlet / outlet ratio, and air inlet / outlet ratio is crucial for the spray effect of the spray head.

[0035] The beneficial effects of this utility model are as follows:

[0036] This utility model optimizes the connection method by integrating the connector with the first quick plug and the second quick plug to form an integrated body. It reduces unnecessary intermediate transition connectors, saves raw materials and processing and assembly time of connectors, simplifies installation and disassembly steps, standardizes assembly, and facilitates promotion and management. At the same time, it reduces resistance to water and air flow, improves spray efficiency, enhances pressure resistance, and improves system reliability, making it suitable for deep well operations.

[0037] This utility model consists of a main body, a transition body, and a nozzle to form a complete spray head. The first quick plug of the main 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 a high-pressure water mist, which plays a role in dust suppression and dust removal.

[0038] This invention optimizes the dust suppression effect of the spray head by adjusting the water-air mixing ratio, the water inlet ratio, and the air inlet ratio.

[0039] By adopting the above solution, this utility model reduces unnecessary connecting parts, reduces resistance to water and air flow, improves spray efficiency, optimizes the connection method, improves pressure resistance, enhances system reliability, simplifies installation and disassembly steps, is suitable for deep well operations, and optimizes spray effect. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model.

[0042] Figure 2 This is a cross-sectional view of the main body of this utility model.

[0043] Figure 3 This is a top view of the main body of this utility model.

[0044] Figure 4 This is a side view of the main body of this utility model.

[0045] In the diagram, 1-O-ring seal; 2-body; 3-sealing gasket; 4-nozzle; 5-press screw; 6-transition body; 21-first quick plug; 22-second quick plug; 23-first annular groove; 24-connector; 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 passage hole; 64-second annular groove; 65-first expansion. Detailed Implementation

[0046] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0047] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0048] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] First embodiment:

[0051] like Figures 1-4 As shown, a water-air mixing spray head includes a body 2, a transition body 3, and a nozzle 4.

[0052] The main body 2 includes an integrally formed connector 24, a first quick plug 21 and a second quick plug 22. The first quick plug 21 and the second quick plug 22 are respectively located on both sides of the connector 24. The connector 24 is provided with a connecting cavity. The first quick plug 21 communicates with the inside of the connecting cavity and is used for water inlet. The second quick plug 22 is provided with an air inlet 221.

[0053] The transition body 6 has a through hole with a water outlet 61 and a water inlet 62 at its two ends. The diameter of the water outlet 61 is smaller than that of the water inlet 62. The transition body 6 has an air passage 63 that communicates with the air inlet 221. The water inlet 62 of the transition body 6 is connected to the connecting cavity, and the transition body 6 is sealed to the main body 2.

[0054] The nozzle 4 is provided with a ball head 41, and the ball head 41 is provided with spray holes 43. The nozzle 4 is provided with a water-air mixing hole 44, which communicates with the spray holes 43. The nozzle 4 is detachably connected to the transition body 6.

[0055] The water outlet 61 extends into and communicates with the water-air mixing hole 44. The extension height of the water outlet 61 into the water-air mixing hole 44 is 0.1 to 0.3 times the height of the water-air mixing hole 44. There is a gap between the outer wall of the water outlet 61 and the inner wall of the water-air mixing hole 44. The air passage 63 communicates with the water-air mixing hole 44 through the gap. Water and air are mixed in the water-air mixing hole 44 and then sprayed out through the spray hole 43.

[0056] 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, which is the water-air mixing ratio.

[0057] The cross-sectional area of ​​the outlet 61 is 0.04 to 0.06 of the water inlet cross-sectional area of ​​the first quick plug 21, i.e., the water inlet ratio; the air inlet cross-sectional area of ​​the water-air mixing hole 44 is 0.05 to 0.07 of the air inlet cross-sectional area of ​​the second quick plug 22, i.e., the air inlet ratio.

[0058] Second embodiment:

[0059] 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.

[0060] Third embodiment:

[0061] 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.

[0062] Fourth embodiment:

[0063] The difference from the first embodiment is that the cross-sectional area of ​​the outlet end 61 is 0.04 of the water inlet cross-sectional area of ​​the first quick plug 21, that is, the water inlet-outlet ratio.

[0064] Fifth embodiment:

[0065] The difference from the first embodiment is that the cross-sectional area of ​​the outlet end 61 is 0.06 of the water inlet cross-sectional area of ​​the first quick plug 21, that is, the water inlet-outlet ratio.

[0066] Sixth embodiment:

[0067] 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.

[0068] Seventh embodiment:

[0069] 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.

[0070] According to the first to seventh embodiments, the following comparative examples were provided:

[0071] First comparison example:

[0072] 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.

[0073] Second comparison:

[0074] 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.

[0075] Third comparison:

[0076] 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.

[0077] Fourth example:

[0078] 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.

[0079] Fifth comparison:

[0080] The difference from the first embodiment is that the cross-sectional area of ​​the outlet end 61 is 0.02 of the water inlet cross-sectional area of ​​the first quick plug 21, that is, the water inlet-outlet ratio.

[0081] Sixth pair of proportions:

[0082] The difference from the first embodiment is that the cross-sectional area of ​​the outlet end 61 is 0.03 of the water inlet cross-sectional area of ​​the first quick plug 21, that is, the water inlet-outlet ratio.

[0083] Seventh parallel example:

[0084] The difference from the first embodiment is that the cross-sectional area of ​​the outlet end 61 is 0.07 of the water inlet cross-sectional area of ​​the first quick plug 21, that is, the water inlet-outlet ratio.

[0085] Eighth parallel example:

[0086] The difference from the first embodiment is that the cross-sectional area of ​​the outlet end 61 is 0.08 of the cross-sectional area of ​​the inlet of the first quick plug 21, that is, the inlet-outlet ratio.

[0087] Ninth Parallel Proportion:

[0088] 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.

[0089] Tenth Comparative Example:

[0090] 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.

[0091] Eleventh proportion:

[0092] 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.

[0093] Twelfth Parallel Example:

[0094] 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.

[0095] Based on the first to seventh embodiments and the solutions of the first to twelfth comparative examples, the following experiments were conducted:

[0096] With the spray coverage area of ​​the spray head set to a circular surface, the water pressure at 5 MPa, the wind pressure at 0.6 MPa, the flow rate constant, and all other conditions consistent, the spray effect of the spray head in the first to seventh embodiments and the first to twelfth comparative embodiments was tested, including the spray distance and coverage radius.

[0097] Table 1 Test data for the first to seventh embodiments

[0098]

[0099] Table 2 Test data for the first to twelfth pairs

[0100]

[0101] Comparing Tables 1 and 2, and comparing the first to third embodiments with the first to fourth comparative embodiments, it can be seen that 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. Under the condition that 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.

[0102] Comparing the first, fourth, and fifth embodiments with the fifth to eighth comparative examples, it can be seen that: when the inlet-outlet water ratio is 0.04 to 0.06, the spray distance of the spray head is stable at 5.4 to 5.6 m and the coverage radius is stable at 0.61 to 0.65 m; when the inlet-outlet water ratio is lower than 0.04 and higher than 0.06, the spray distance is lower than 5 m and the coverage radius is lower than 0.53 m.

[0103] Comparing the first, sixth, and seventh embodiments with the eighth to twelfth comparative embodiments, it can be seen that: when other conditions remain unchanged, when the air intake-to-exhaust ratio is 0.05 to 0.07, the spray distance of the spray head is stable at 5.4 to 5.6 m, and the coverage radius is stable at 0.63 to 0.65 m; when the air intake-to-exhaust ratio is lower than 0.05 and higher than 0.07, the spray distance is lower than 4.6 m, and the coverage radius is lower than 0.5 m.

[0104] In summary, the spray effect of the spray head is better when the water-air mixing ratio is 6~7:3~4, the water inlet-outlet ratio is 0.04~0.06, and the air inlet-outlet ratio is 0.05~0.07. Among these, the spray effect of the spray head is optimal when the water-air mixing ratio is 6.7:3.3, the water inlet-outlet ratio is 0.05, and the air inlet-outlet ratio is 0.06.

[0105] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A water-air mixing spray head, characterized in that: The device includes a main body, a transition body, and a nozzle. The main body comprises an integrally formed connecting body, a first quick plug, and a second quick plug, which are located on opposite sides of the connecting body. The connecting body has a connecting cavity; the first quick plug communicates with the interior of the connecting cavity, and the second quick plug has an air inlet. The transition body has a through hole, with a water outlet and a water inlet at its two ends, the diameter of the water outlet being smaller than the diameter of the water inlet. The transition body has an air passage hole that communicates with the air inlet. The water inlet of the transition body is connected to the connecting cavity, and the transition body is sealed to the main body; the nozzle is detachably connected to the transition body; the nozzle is provided with a ball head, and the ball head is provided with spray holes; the nozzle is provided with a water-air mixing hole, which is connected to the spray holes; the water outlet extends into the water-air mixing hole, and the extension height of the water outlet 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 and the inner wall of the water-air mixing hole, and the air passage hole is connected to the water-air mixing hole through the gap.

2. The water-air mixing 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 cross-sectional area of ​​the outlet hole 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 at the first quick plug is 2~7 MPa, and the air pressure at the second quick plug is 0.4~0.8 MPa.

3. The water-air mixing spray head according to claim 1, characterized in that: The first quick plug has a water inlet stepped hole, the diameter of which decreases from the outside to the inside. The inner end of the water inlet stepped hole communicates with the connecting cavity, and the inner end diameter of the water inlet stepped hole is 0.5 to 0.8 times the outer end diameter. The diameter of the water inlet end of the transition body is not greater than the inner end diameter of the water inlet stepped hole, and the diameter of the water outlet end is 0.05 to 0.15 times the diameter of the water inlet end. The water inlet end and the water outlet end of the transition body are connected by a stepped hole, and the diameter gradually decreases from the water inlet end to the water outlet end.

4. The water-air mixing spray head according to claim 1, characterized in that: The second quick plug is provided with an air inlet expansion hole, which is connected to the air outlet hole. The diameter of the air inlet expansion hole is larger than that of the air inlet hole, and the diameter of the air inlet expansion hole is 1.5 to 2.5 times that of the air inlet hole. The air outlet hole is arranged circumferentially around the water outlet end. The air outlet hole is an oblique hole with an inclination angle of 3 to 10°, and gradually tapers inward from bottom to top.

5. A water-air mixing spray head according to claim 1, characterized in that: The connector has a first annular groove around the connecting cavity, which communicates with the air inlet expansion hole; the transition body has a second annular groove at its bottom, which communicates with the air passage hole and is aligned with the first annular groove; 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, which is positioned between the first and second annular grooves.

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

7. A water-air mixing spray head according to claim 1, characterized in that: The nozzle has a cavity at its bottom, which is connected to the water-air mixing hole. The minimum diameter of the cavity is the same as the diameter of the water-air mixing hole. The air passage of the transition body is connected to the cavity.

8. A water-air mixing 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 cross-sectional area of ​​the water outlet is 0.05 times the water inlet cross-sectional area of ​​the first quick plug; and the air inlet cross-sectional area of ​​the water-air mixing hole is 0.06 times the air inlet cross-sectional area of ​​the second quick plug.

9. A water-air mixing spray head according to claim 7, characterized in that: The cavity at the bottom of the nozzle is a conical cavity with an inner diameter that gradually decreases from bottom to top; the top of the transition body is provided with a conical expansion platform, the height of which is 0.3 to 0.5 times the height of the conical cavity; the outlet of the air passage is located on the conical expansion platform, which extends into the cavity and the inner wall of the conical cavity is in clearance fit with the outer wall of the conical expansion platform.

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