Dry fog spraying device with external mixing spraying function

Abstract

The utility model provides a dry fog spraying device capable of externally mixing and spraying, which comprises a gas-guide tube, at least one spray head component and at least one spray head, the spray head assembly comprises a tail cover arranged at the top of the air guide pipe, an air guide connecting body is arranged at the position, corresponding to the tail cover, of the bottom of the air guide pipe, a water guide rod penetrating through the air guide pipe and inserted into the air guide connecting body is arranged in the tail cover, and a nozzle is arranged on the lower side of the annular side face of the air guide connecting body. An air outlet hole is formed in the joint of the lower side of the inner wall of the air guide pipe and the water guide rod, air guide holes which are communicated with the air outlet hole and formed in the two sides of the water guide rod are symmetrically formed in the air guide connecting body in a penetrating mode, and a water guide hole communicated with the inner wall of the water guide rod is formed between the top and the bottom of the air guide connecting body; the spray nozzle has the advantages that the spray nozzle is reasonable in structure, fine and uniform in fog drop, water-saving in spraying, high in fog production, rapid in fog diffusion and convenient to disassemble and maintain, and fog drops are fine and uniform.

Description

Technical Field

[0001] The utility model relates to a dry fog spray device, in particular to a dry fog spray device with external mixed spray. Background Art

[0002] A dry fog spray device is needed to reduce dust in the air, such as dust. Currently, there are many spray devices used in various scenarios. Generally speaking, nozzles are used to mix air and water.

[0003] In the prior art, the existing dry fog spray device generally uses internal mixing spray for air and water when in use, which will result in large and uneven droplets, large water consumption, small fog production, and full fog diffusion. Moreover, the spray position is generally fixed, which is not convenient for adjusting the spray angle. In addition, due to water quality problems, it needs to be disassembled for maintenance after working for a period of time, which brings a lot of workload to the on-site staff. The nozzle part of the internal mixing spray is not convenient to disassemble and is not convenient for maintenance operations. Now there is an urgent need for a dry fog spray device with external mixing spray to solve the above problems. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a dry fog spray device with external mixed spray to solve the problems raised in the above-mentioned background technology. The utility model has a reasonable structure, small and uniform droplets, water-saving spray, large fog production, rapid fog diffusion, and convenient disassembly and maintenance.

[0005] In order to achieve the above object, the utility model is realized through the following technical scheme: a dry fog spray device for external mixed spray, comprising:

[0006] An air guide tube, wherein at least one nozzle assembly is arranged inside the air guide tube;

[0007] The nozzle assembly includes a tail cover arranged on the top of the air guide pipe, an air guide connector is arranged at a position of the bottom of the air guide pipe corresponding to the tail cover, a water guide rod penetrating the air guide pipe and inserted into the air guide connector is arranged inside the tail cover, a nozzle is arranged on the lower side of the annular side of the air guide connector, a pressure cap connected to the side wall of the air guide connector is arranged on the side wall of the nozzle, an air outlet hole is arranged at the connection between the lower side of the inner wall of the air guide pipe and the water guide rod, air guide holes connected to the air outlet holes and arranged on both sides of the water guide rod are symmetrically opened inside the air guide connector, a water guide hole connected to the inner wall of the water guide rod is opened between the top and bottom of the air guide connector, a second guide hole connected to the water guide hole is opened at a position of the bottom of the nozzle corresponding to the water guide hole, and a first guide hole connected to the air guide hole and used for blowing and atomizing liquid flowing out of the second guide hole is opened at a position inside the nozzle corresponding to the air guide hole.

[0008] Furthermore, a limiting groove matching the lower side of the annular side of the water guide rod and connected to the water guide hole is provided on the top of the air guide connector, and the side wall of the water guide rod is tightly fitted with the inner wall of the limiting groove;

[0009] A sealing groove is provided on the top of the air guide tube, and the lower side of the annular side of the tail cover fits tightly with the sealing groove.

[0010] Furthermore, an atomizing groove is provided at the bottom of the nozzle, the atomizing groove includes a circular hole provided at the bottom of the nozzle and connected to the second flow guide hole, and a conical hole is provided at the bottom of the nozzle and is placed below the circular hole and connected to the circular hole;

[0011] The first guide hole includes a cylindrical hole and an inclined hole placed below the cylindrical hole. The cylindrical hole is opened inside the nozzle and communicated with the air guide hole. The inclined hole is opened inside the nozzle and communicated with the cylindrical hole and the conical hole respectively.

[0012] Furthermore, a three-way valve is arranged on the top of the water guide rod, and water connecting pipes are arranged at both ends of the three-way valve.

[0013] Furthermore, sealing plates are respectively provided at both ends of the air guide tube, an L-shaped extension plate is provided on the top of a pair of sealing plates, a pair of side walls of the sealing plates are provided with joint seats inserted into the air guide tube, a pair of side walls of the joint seats are provided with air joints, and a pair of side walls of the air joints are provided with ear plates, which are fitted with the side walls of the L-shaped extension plates, and the ends of the water connecting pipes at both ends of the three-way valve are provided with water joints that respectively penetrate the L-shaped extension plates and the ear plates.

[0014] Furthermore, a fastener is provided between the L-shaped extension plate and the hanging ear plate.

[0015] Furthermore, the fastener includes a bolt which is arranged on the side wall of the ear plate and passes through the L-shaped extension plate, and a locking nut for pressing the L-shaped extension plate is arranged on the side wall of the threaded column of the bolt.

[0016] Furthermore, a through hole is provided on the side wall of the ear plate, and the ear plate is mounted on a side wall of the air joint close to the joint seat through the through hole. A rotating avoidance groove is provided on the side wall of the ear plate for avoiding the water joint. A plurality of adjustment holes matching the fasteners are provided on the side wall of the ear plate. A hanging hole is provided on the side wall of the ear plate and is placed above the adjusting hole. The side walls of the air joint and the water joint are provided with clamping nuts for pressing the ear plate and the L-shaped extension plate respectively.

[0017] Furthermore, when multiple nozzle assemblies are provided, three-way valves are provided on the water guide rods of the multiple nozzle assemblies, and adjacent three-way valves are connected by water connecting pipes.

[0018] Furthermore, an annular clamping groove is opened on the lower side of the annular side of the nozzle, the pressure cover is sleeved inside the annular clamping groove, the inner wall of the pressure cover is provided with an internal thread, the side wall of the air guide connector is provided with an external thread, and the pressure cover and the air guide connector are connected by threads.

[0019] According to the dry fog spray device of the external mixing spray of the utility model, by making the high-speed gas flowing out of the first guide hole meet the liquid flowing out of the second guide hole, a fluid collision is instantly generated, and the water is dispersed into fine droplets by the high-speed airflow and diffused out rapidly. In this way, the gas and liquid are mixed outside the nozzle to realize the external mixing spray, so that the droplets are small and uniform, avoiding the phenomenon of large droplets and wasting water. Compared with the internal mixing spray, the water-saving effect is better, the mist production is large, and the mist diffuses rapidly;

[0020] By using the hanging hole, it is convenient to hang the ear plate, for example, on the top of the tunnel. By using the through hole, it is convenient to rotate the air joint, the joint seat, the air guide pipe, the sealing plate, the L-shaped extension plate, the water connecting pipe, the three-way valve and the nozzle assembly as a whole along the through hole, so as to adjust the spray angle of the nozzle assembly. When it is rotated to the position of the adjustment hole with a suitable adjustment angle, the adjusted position can be fixed by fasteners, which plays a role in facilitating the adjustment of the spray angle.

[0021] By using a threaded connection, the pressure cover is driven to move upward, and the upward movement of the pressure cover drives the nozzle to move upward and fit closely with the air guide connector under the action of the annular clamping groove, thereby completing the installation and sealing operation. When disassembly is required, the nozzle and the air guide connector are conveniently separated under the action of the threaded connection, thereby facilitating disassembly and assembly, and facilitating cleaning and maintenance of the nozzle and the air guide connector, avoiding the problem of inconvenient disassembly of the nozzle part of the internal mixed spray. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0023] Figure 1 It is a three-dimensional diagram of a dry fog spray device for external mixing spray according to an embodiment of the utility model;

[0024] Figure 2 According to an embodiment of the present utility model Figure 1 A magnified view of middle;

[0025] Figure 3 It is a three-dimensional diagram of the connection between the air guide pipe, the water connection pipe and the ear plate in a dry fog spray device for external mixing spray according to one embodiment of the utility model;

[0026] Figure 4It is a front view of a dry fog spray device for external mixing spray according to one embodiment of the utility model;

[0027] Figure 5 It is a bottom cross-sectional view of a dry fog spray device for external mixing spray according to one embodiment of the utility model;

[0028] Figure 6 According to an embodiment of the present utility model Figure 5 Enlarged view of middle B;

[0029] Figure 7 It is a three-dimensional diagram of the connection between the air guide pipe and the nozzle assembly in a dry fog spray device for external mixing spray according to one embodiment of the utility model;

[0030] Figure 8 According to an embodiment of the present utility model Figure 7 A right side cross-sectional view of the connection between the air guide pipe and the nozzle assembly;

[0031] Fig. 9 It is a three-dimensional diagram of a nozzle assembly in a dry mist spray device for external mixing spray according to an embodiment of the utility model;

[0032] In the figure: 1. water connecting pipe; 2. three-way valve; 3. nozzle assembly; 31. water guide rod; 32. tail cover; 33. air guide connector; 331. air guide hole; 332. water guide hole; 333. limit groove; 34. pressure cover; 35. nozzle; 351. first guide hole; 352. second guide hole; 353. atomizing groove; 3531. circular hole; 3532. conical hole; 354. annular clamping groove; 4. air guide pipe; 41. air outlet; 5. sealing plate; 51. L-shaped extension plate; 6. joint seat; 7. ear plate; 71. rotation avoidance groove; 72. adjustment hole; 73. through hole; 74. hanging hole; 8. air joint; 81. clamping nut; 9. water joint; 10. fastener; 101. bolt; 102. locking nut. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0034] like Figure 1 , Figure 7 and Figure 8 As shown, the utility model provides a technical solution: a dry fog spray device for external mixed spray, comprising:

[0035] An air guide tube 4, wherein at least one nozzle assembly 3 is arranged inside the air guide tube 4;

[0036] The nozzle assembly 3 includes a tail cover 32 arranged on the top of the air guide pipe 4, an air guide connector 33 is arranged at the bottom of the air guide pipe 4 at a position corresponding to the tail cover 32, a water guide rod 31 penetrating the air guide pipe 4 and inserted into the air guide connector 33 is arranged inside the tail cover 32, a nozzle 35 is arranged on the lower side of the annular side of the air guide connector 33, a pressure cap 34 connected to the side wall of the air guide connector 33 is arranged on the side wall of the nozzle 35, an air outlet 41 is arranged at the connection between the lower side of the inner wall of the air guide pipe 4 and the water guide rod 31, and the air outlet 41 is symmetrically opened inside the air guide connector 33 The air guide holes 331 are connected and arranged on both sides of the water guide rod 31, a water guide hole 332 connected to the inner wall of the water guide rod 31 is opened between the top and the bottom of the air guide connector 33, a second guide hole 352 connected to the water guide hole 332 is opened at a position corresponding to the water guide hole 332 at the bottom of the nozzle 35, and a first guide hole 351 connected to the air guide hole 331 and used to blow and atomize the liquid flowing out of the second guide hole 352 is opened at a position corresponding to the air guide hole 331 inside the nozzle 35. This design is achieved by using a water guide pipe to connect the air guide connector 3 3 is used for water supply, and the water enters the nozzle 35 along the water guide hole 332 and flows out from the second guide hole 352. At the same time, the air guide pipe 4 supplies air to the air guide connector 33 under the action of the air outlet hole 41, and the gas enters the nozzle 35 along the air guide hole 331 and flows out from the first guide hole 351. Since the gas enters the air guide hole 331 from the air guide pipe 4 along the air outlet hole 41, the cross-sectional area of ​​the gas flow is reduced, so that the gas flow rate is increased, so that the high-speed gas flowing out of the first guide hole 351 meets the liquid flowing out of the second guide hole 352. As a result, fluid collision occurs instantly, and water will be dispersed into fine droplets by high-speed airflow and diffuse out rapidly. In this way, gas and liquid are mixed outside the nozzle 35 to achieve external mixed spray, so that the droplets are small and uniform, avoiding the phenomenon of large droplets and wasting water. It is better than internal mixed spray in water saving effect, large mist production and rapid mist diffusion. Among them, under the action of the inner wall of the water guide rod 31 being connected with the water guide hole 332, the gas flowing into the inside of the air guide connector 33 from the air outlet 41 is prevented from entering the inside of the water guide hole 332, which is particularly suitable for spray dust reduction in high dust environment.

[0037] Reference Figure 7 and Figure 8 A limiting groove 333 matching the lower side of the annular side of the water guide rod 31 and connected to the water guide hole 332 is provided on the top of the air guide connector 33. The side wall of the water guide rod 31 is tightly fitted with the inner wall of the limiting groove 333. This design improves the sealing performance of the connection between the water guide rod 31 and the air guide connector 33, and prevents the gas flowing into the air guide connector 33 from the air outlet 41 and entering the water guide hole 332.

[0038] A sealing groove is provided on the top of the air duct 4, and the lower side of the annular side of the tail cover 32 fits tightly with the sealing groove. This design improves the sealing performance of the connection between the air duct 4 and the tail cover 32 to avoid air leakage.

[0039] Reference Figure 8 and Fig. 9 The bottom of the nozzle 35 is provided with an atomizing groove 353, the atomizing groove 353 includes a circular hole 3531 provided at the bottom of the nozzle 35 and connected to the second flow guide hole 352, and the bottom of the nozzle 35 is provided with a conical hole 3532 disposed below the circular hole 3531 and connected to the circular hole 3531;

[0040] The first guide hole 351 includes a cylindrical hole and an inclined hole placed below the cylindrical hole. The cylindrical hole is opened inside the nozzle 35 and is connected to the air guide hole 331. The inclined hole is opened inside the nozzle 35 and is respectively connected to the cylindrical hole and the conical hole 3532. This design allows the high-speed gas of the air guide hole 331 to flow through the cylindrical hole and the inclined hole into the conical hole 3532 and meet the liquid flowing out of the circular hole 3531, thereby instantly generating a fluid collision. The water will be dispersed into fine droplets by the high-speed airflow and diffuse out rapidly, thereby enhancing the effect of fine and uniform droplets. In this way, the gas and liquid are mixed outside the nozzle 35 to realize external mixed spray, so that the droplets are small and uniform and can reach 10-20μm, which saves about 50% water compared with internal mixed spray, has a large amount of fog production, and diffuses rapidly. It is particularly suitable for spray dust reduction in high dust environments.

[0041] Reference Figure 1 , Figure 4 and Figure 5 A three-way valve 2 is provided on the top of the water guide rod 31, and water connecting pipes 1 are provided at both ends of the three-way valve 2. This design facilitates the water supply operation of the water guide rod 31 by using the three-way valve 2 and the water connecting pipe 1.

[0042] Reference Figure 2 and Figure 3 , sealing plates 5 are respectively provided at both ends of the air guide pipe 4, a pair of sealing plates 5 are respectively provided with L-shaped extension plates 51 on the top, a pair of sealing plates 5 are respectively provided with joint seats 6 inserted into the air guide pipe 4 on the side walls, a pair of joint seats 6 are respectively provided with gas joints 8 on the side walls, a pair of gas joints 8 are respectively provided with ear plates 7 on the side walls, and the ear plates 7 are fitted with the side walls of the L-shaped extension plates 51, and the ends of the water connecting pipes 1 at both ends of the three-way valve 2 are respectively provided with water joints 9 that penetrate the L-shaped extension plates 51 and the ear plates 7. This design improves the stability of conveying gas and liquid by facilitating the connection between the air joint 8 and the water joint 9, wherein the air joint 8 is connected with the joint seat 6, the joint seat 6 is connected with the air guide pipe 4, and the water joint 9 is connected with the water connecting pipe 1, wherein the water joint 9 is connected to an external water source, and the air joint 8 is connected to an external air source, and welding is adopted between the sealing plate 5 and the air guide pipe 4, and between the joint seat 6 and the sealing plate 5 to ensure sealing and pressure resistance.

[0043] Reference Figure 3A fastener 10 is provided between the L-shaped extension plate 51 and the ear plate 7. This design improves the stability of the connection between the L-shaped extension plate 51 and the ear plate 7 by using the fastener 10, and further improves the stability of the connection between the L-shaped extension plate 51 and the ear plate 7. The fastener 10 includes a bolt 101 which is arranged on the side wall of the ear plate 7 and passes through the L-shaped extension plate 51. The side wall of the threaded column of the bolt 101 is provided with a locking nut 102 for pressing the L-shaped extension plate 51. This design facilitates the connection and fixing operation between the L-shaped extension plate 51 and the ear plate 7 and improves the stability of the connection by using the locking nut 102 and the bolt 101.

[0044] Reference Figure 3 , Figure 5 and Figure 6 The side wall of the ear plate 7 is provided with a through hole 73, and the ear plate 7 is sleeved on a side wall of the gas joint 8 near the joint seat 6 through the through hole 73. The side wall of the ear plate 7 is provided with a rotation avoidance groove 71 for avoiding the water joint 9. The side wall of the ear plate 7 is provided with a plurality of adjustment holes 72 matching the fastener 10, and the side wall of the ear plate 7 is provided with a hanging hole 74 arranged above the adjusting hole 72. The side walls of the gas joint 8 and the water joint 9 are provided with a compression nut 81 for pressing the ear plate 7 and the L-shaped extension plate 51 respectively. This design facilitates the hanging of the ear plate 7 by using the hanging hole 74, for example, it can be suspended Hanging on the top of the tunnel, by using the through hole 73, it is convenient to rotate the air joint 8, the joint seat 6, the air guide pipe 4, the sealing plate 5, the L-shaped extension plate 51, the water connecting pipe 1, the three-way valve 2 and the nozzle assembly 3 as a whole along the through hole 73, so as to adjust the spray angle of the nozzle assembly 3. When it is rotated to the position of the adjustment hole 72 for the appropriate adjustment angle, the adjusted position can be fixed by the fastener 10, which plays a role in facilitating the adjustment of the spray angle. The clamping nut 81 is used to press the ear plate 7 and the L-shaped extension plate 51 to improve the stability of the connection.

[0045] Reference Figure 1 and Figure 4 When multiple nozzle assemblies 3 are provided, three-way valves 2 are provided on the water guide rods 31 of the multiple nozzle assemblies 3, and adjacent three-way valves 2 are connected by a water connecting pipe 1. This design facilitates the splicing and installation of multiple nozzle assemblies 3 by using three-way valves 2. The nozzle assemblies 3 can be flexibly combined according to user requirements, and can be connected in series or in parallel.

[0046] Reference Figure 8The annular side surface of the nozzle 35 is provided with an annular clamping groove 354, and the pressure cover 34 is sleeved inside the annular clamping groove 354. The inner wall of the pressure cover 34 is provided with an internal thread, and the side wall of the air guide connector 33 is provided with an external thread. The pressure cover 34 and the air guide connector 33 are connected by a thread. This design uses a threaded connection to drive the pressure cover 34 to move upward. The pressure cover 34 moves upward and drives the nozzle 35 to move upward and fit closely with the air guide connector 33 under the action of the annular clamping groove 354, thereby completing the installation and sealing operation. When disassembly is required, the nozzle 35 and the air guide connector 33 are separated conveniently under the action of the threaded connection, thereby facilitating disassembly and assembly, and facilitating cleaning and maintenance of the nozzle 35 and the air guide connector 33, thereby avoiding the problem of inconvenient disassembly of the nozzle part of the internal mixed spray.

[0047] Reference Figure 1-Figure 9 As an embodiment of the utility model: when spraying is required, the staff connects the water joint 9 to the external water source, and the air joint 8 to the external air source, so as to supply water and air to the water connection pipe 1 and the air guide pipe 4 respectively, and the water enters the nozzle 35 along the water guide hole 332 and flows out from the second guide hole 352. At the same time, the air guide pipe 4 supplies air to the air guide connector 33 under the action of the air outlet hole 41, and the gas enters the nozzle 35 along the air guide hole 331 and flows out from the first guide hole 351. Outflow, as the gas enters the inside of the air guide hole 331 from the air guide pipe 4 along the air outlet 41, the cross-sectional area of ​​the gas flow is reduced, thereby increasing the gas flow rate, so that the high-speed gas flowing out of the first guide hole 351 meets the liquid flowing out of the second guide hole 352, thereby instantly generating a fluid collision, and the water will be dispersed into fine droplets by the high-speed airflow and diffuse out rapidly, so that the droplets are small and uniform, avoiding the phenomenon of large droplets and wasting water. It has better water-saving effect than internal mixing spray, large mist production, and rapid mist diffusion.

[0048] When the spray angle needs to be adjusted, first remove the fastener 10, and then apply force to the nozzle assembly 3. Under the action of the through hole 73, the air connector 8, the connector seat 6, the air guide tube 4, the sealing plate 5, the L-shaped extension plate 51, the water connecting pipe 1, the three-way valve 2 and the nozzle assembly 3 can be rotated along the through hole 73 as a whole, so as to adjust the spray angle of the nozzle assembly 3. When it is rotated to the position of the adjustment hole 72 with a suitable adjustment angle, the adjusted position can be fixed by the fastener 10, thereby facilitating the adjustment of the spray angle.

[0049] The use of the three-way valve 2 facilitates the splicing and installation of multiple nozzle assemblies 3, and is convenient for installation and disassembly, and for subsequent maintenance, thereby improving the practicality of the utility model.

[0050] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A dry fog spray device for external mixed spray, characterized in that: include: An air guide tube (4), wherein at least one nozzle assembly (3) is arranged inside the air guide tube (4); The nozzle assembly (3) comprises a tail cover (32) arranged on the top of the air guide pipe (4); an air guide connector (33) is arranged at a position at the bottom of the air guide pipe (4) corresponding to the tail cover (32); a water guide rod (31) is arranged inside the tail cover (32) and passes through the air guide pipe (4) and is inserted into the air guide connector (33); a nozzle (35) is arranged on the lower side of the annular side of the air guide connector (33); a pressure cover (34) connected to the side wall of the air guide connector (33) is arranged on the side wall of the nozzle (35); an air outlet hole (41) is arranged at the connection between the lower side of the inner wall of the air guide pipe (4) and the water guide rod (31); and the air guide connector (33) is provided with a nozzle (35) on the lower side of the inner wall of the air guide pipe (4) and the water guide rod (31). Air guide holes (331) are symmetrically arranged through the nozzle (35) and are connected to the air outlet hole (41) and are arranged on both sides of the water guide rod (31). A water guide hole (332) is arranged between the top and the bottom of the air guide connector (33) and is connected to the inner wall of the water guide rod (31). A second flow guide hole (352) is arranged at a position corresponding to the water guide hole (332) at the bottom of the nozzle (35) and is connected to the water guide hole (332). A first flow guide hole (351) is arranged at a position corresponding to the air guide hole (331) inside the nozzle (35) and is connected to the air guide hole (331) and is used for blowing and atomizing liquid flowing out of the second flow guide hole (352).

2. The dry fog spray device of external mix spray according to claim 1, characterized in that: The top of the air guide connecting body (33) is provided with a limiting groove (333) which matches the lower side of the annular side of the water guide rod (31) and is connected to the water guide hole (332), and the side wall of the water guide rod (31) is tightly fitted with the inner wall of the limiting groove (333); A sealing groove is provided on the top of the air guide pipe (4), and the lower side of the annular side surface of the tail cover (32) is tightly fitted with the sealing groove.

3. The dry fog spray device of external mixing spray according to claim 1, characterized in that: The bottom of the nozzle (35) is provided with an atomizing groove (353), the atomizing groove (353) comprises a circular hole (3531) provided at the bottom of the nozzle (35) and connected to the second flow guide hole (352), and the bottom of the nozzle (35) is provided with a conical hole (3532) disposed below the circular hole (3531) and connected to the circular hole (3531); The first air guide hole (351) comprises a cylindrical hole and an inclined hole disposed below the cylindrical hole; the cylindrical hole is opened inside the nozzle (35) and is connected to the air guide hole (331); the inclined hole is opened inside the nozzle (35) and is respectively connected to the cylindrical hole and the conical hole (3532).

4. The dry fog spray device of external mix spray according to claim 1, characterized in that: A three-way valve (2) is provided at the top of the water guide rod (31), and water connecting pipes (1) are respectively provided at both ends of the three-way valve (2).

5. The dry fog spray device of external mix spray according to claim 4, characterized in that: The two ends of the air guide tube (4) are respectively provided with sealing plates (5), the tops of a pair of the sealing plates (5) are each provided with an L-shaped extension plate (51), the side walls of a pair of the sealing plates (5) are each provided with a joint seat (6) inserted into the interior of the air guide tube (4), the side walls of a pair of the joint seats (6) are each provided with an air joint (8), the side walls of a pair of the air joints (8) are each sleeved with a lug plate (7), the lug plate (7) is fitted with the side wall of the L-shaped extension plate (51), and the ends of the water connecting pipes (1) at both ends of the three-way valve (2) are each provided with a water joint (9) respectively penetrating the L-shaped extension plate (51) and the lug plate (7).

6. The dry fog spray device of external mixing spray according to claim 5, characterized in that: A fastener (10) is provided between the L-shaped extension plate (51) and the lug plate (7).

7. The dry fog spray device of external mix spray according to claim 6, characterized in that: The fastener (10) comprises a bolt (101) arranged on the side wall of the ear plate (7) and penetrating the L-shaped extension plate (51); a locking nut (102) for pressing the L-shaped extension plate (51) is arranged on the side wall of the threaded column of the bolt (101).

8. The dry fog spray device of external mix spray according to claim 6, characterized in that: The side wall of the ear plate (7) is provided with a through hole (73), and the ear plate (7) is sleeved on a side wall of the gas joint (8) close to the joint seat (6) through the through hole (73). The side wall of the ear plate (7) is provided with a rotation avoidance groove (71) for avoiding the water joint (9). The side wall of the ear plate (7) is provided with a plurality of adjustment holes (72) matching the fastener (10). The side wall of the ear plate (7) is provided with a hanging hole (74) arranged above the adjustment hole (72). The side walls of the gas joint (8) and the water joint (9) are both provided with compression nuts (81) for pressing the ear plate (7) and the L-shaped extension plate (51) respectively.

9. The dry fog spray device of external mix spray according to claim 5, characterized in that: When a plurality of the nozzle assemblies (3) are provided, a three-way valve (2) is provided on the water guide rods (31) of the plurality of nozzle assemblies (3), and adjacent three-way valves (2) are connected via a water connecting pipe (1).

10. The dry fog spray device of external mix spray according to claim 1, characterized in that: An annular clamping groove (354) is provided on the lower side of the annular side surface of the nozzle (35), the pressure cover (34) is sleeved inside the annular clamping groove (354), the inner wall of the pressure cover (34) is provided with an internal thread, the side wall of the air guide connector (33) is provided with an external thread, and the pressure cover (34) and the air guide connector (33) are connected via threads.

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