A cold fogging machine spray device

Abstract

The application discloses a cold fog machine spraying device and belongs to the technical field of atomization spraying. The cold fog machine spraying device comprises a heating pipe which is arranged in a shell and is communicated with a spraying head. The heating pipe comprises a wide-diameter pipe and a coil pipe. The inner diameter of the coil pipe is 5-8 mm. The wide-diameter pipe is in a straight pipe structure and the inner diameter of the wide-diameter pipe is not less than 2 times of the inner diameter of the coil pipe. The wide-diameter pipe is sleeved in the coil pipe, the tail end of the wide-diameter pipe is close to a combustion mechanism, the liquid inlet of the tail end of the wide-diameter pipe is communicated with the liquid outlet of the coil pipe, and at least the coil pipe is closely arranged between pipelines on the first end side and used for guiding the flame to the flame channel. The scheme combines the coil pipe with a small pipe diameter and the straight pipe with a large pipe diameter, delays the pipeline scale and blockage on the basis of realizing atomization, and has better use effect.

Description

Technical Field

[0001] This invention relates to the field of steam atomizer technology, and more specifically, to a cold fogging device for heating liquid to form steam, which then atomizes the liquid upon spraying. Background Technology

[0002] A cold fogger, also known as a steam sprayer, is a small atomizing spray device that uses the heat energy generated by fuel combustion to heat the liquid inside the coil, turning the liquid into a high-temperature, high-pressure gas, which is then atomized when sprayed from the nozzle. It can be used for spraying pesticides and steam cleaning.

[0003] When using steam sprayers, the liquid used is mostly water, or water with added volatile agents to form an additive; its main component is still water. The water used in steam sprayers is mostly obtained from ordinary water sources such as tap water, well water, and river water, which contain a large number of impurities. After being heated to high temperatures, these chemical substances precipitate out and adhere to the pipe surface, forming scale and clogging the pipes.

[0004] As disclosed in patent ZL2023231766242, a steam sprayer has the following structure: Figure 1 As shown, its combustion chamber has a coil. The first end of the coil is connected to an external additive pipe. After passing through the coil, the second end passes through the inside of the coil to form a straight pipe section, which is connected to the nozzle at the outlet. In the field of sprayers, the diameter of the coil is generally around 3mm. If it is too large, it will affect its heat absorption effect, but such pipes are easy to clog.

[0005] In other fields, such as steam generators and boilers, large-diameter coils can be used; partial blockages do not affect overall operation, and cleaning frequency is low. However, for steam sprayers, increasing the pipe diameter increases the overall size, making handheld operation difficult. More importantly, to ensure atomization, the flame intensity must be increased. This leads to higher fuel consumption and higher surface temperatures on the sprayer's casing, posing significant safety hazards in agricultural use and making handheld operation impossible.

[0006] Given the current situation, in order to extend the service life of steam sprayers, it is necessary to regularly clean the pipes with chemical reagents to remove scale buildup inside. Therefore, how to prevent steam sprayer pipe blockage remains a challenge. Summary of the Invention

[0007] 1. The technical problem that the invention aims to solve

[0008] The purpose of this invention is to overcome the problem of easy clogging of coils in existing technologies and to provide a cold mist spraying device. This solution combines a smaller diameter coil with a larger diameter straight pipe, which, while achieving atomization, delays pipe scaling and clogging, resulting in better performance.

[0009] 2. Technical Solution

[0010] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0011] A cold fog spraying device of the present invention includes a combustion mechanism, a fan and a housing located at both ends of the combustion mechanism, a heating pipe installed inside the housing, the heating pipe communicating with the nozzle, and the heating pipe including a wide-diameter pipe and a coil.

[0012] The coil has a spiral structure, extending spirally along the axial direction of the shell, and the inner diameter of the coil is less than 6.8 mm.

[0013] The wide-diameter tube is a straight tube with an outer diameter of 16-28 mm and an inner diameter not less than twice the inner diameter of the coil. The wide-diameter tube is installed inside the coil, with its tail end close to the combustion mechanism. The liquid inlet at the tail end of the wide-diameter tube is connected to the liquid outlet of the coil.

[0014] An annular flame channel is formed between the inner wall of the coil and the wide-diameter pipe, and the radial dimension of the flame channel is not less than 4 mm; at least the pipes on the first end side of the coil are closely arranged to guide the flame into the flame channel.

[0015] The nozzle is connected to the head end of the wide-diameter pipe and is used to spray out high-temperature and high-pressure media to form atomized particles.

[0016] Furthermore, the nozzle is detachably mounted at the head end of the wide-diameter pipe.

[0017] When the nozzle and the wide-diameter pipe are separated, the end face cavity of the wide-diameter pipe is completely open; or the wide-diameter pipe has a small outlet that can be connected to the nozzle.

[0018] Furthermore, the nozzle includes a connector and a nozzle, the connector being threaded to a wide-diameter pipe.

[0019] Furthermore, a cover plate is connected to the first end of the housing, and the ends of the wide-diameter pipe and the coil pass through the cover plate, which is connected to the housing.

[0020] Furthermore, the length of the section where the coils are closely arranged is L, and this length L is not less than 1 / 3 of the length of the coil.

[0021] Furthermore, the liquid outlet of the coil is connected to the side wall of the tail end of the wide-diameter pipe, and the distance between the tail end of the wide-diameter pipe and the end face of the combustion mechanism is not less than 20mm, forming a fuel injection zone to guide the flame.

[0022] Furthermore, each spiral ring that makes up the coil has a uniform diameter structure, and a gap is formed between the pipes on one side of the coil to allow the flame to pass through.

[0023] A cold fog spraying device of the present invention includes a fan, a combustion mechanism, a housing and a nozzle arranged in sequence. A heating tube is installed inside the housing and is connected to the nozzle. The heating tube is characterized in that: the heating tube includes a wide-diameter tube and a coil, the tail end of the wide-diameter tube is close to the combustion mechanism, and the liquid inlet of the tail end of the wide-diameter tube is connected to the liquid outlet of the coil.

[0024] The wide-diameter pipe has a straight pipe structure, and the coil is wrapped around the outer circumference of the wide-diameter pipe. At least the pipes with the coil on the first end are closely arranged, forming an annular flame channel between the inner wall of the coil and the wide-diameter pipe. The inner diameter of the coil is 4.0 to 6.5 mm, and the inner diameter of the wide-diameter pipe is 2.2 to 5.0 times the inner diameter of the coil, so that the wide-diameter pipe forms an expansion and pressure reduction space relative to the coil.

[0025] The nozzle is detachably connected to the head of the wide-diameter pipe and is used to spray out high-temperature and high-pressure media to form atomized particles.

[0026] Furthermore, the pipes on the first side of the coil are closely arranged to guide the flame into the flame channel; gaps are formed between the pipes on the second side of the coil to allow the flame to pass through; or,

[0027] The pipes between the coils are arranged at equal intervals, and adjacent pipes are arranged closely together, which is used to guide the flame to the flame channel.

[0028] Furthermore, the outer diameter of the wide-diameter tube is 16-28 mm, the distance between the inner wall of the coil and the wide-diameter tube is not less than 4 mm, and the distance between the coil and the inner wall of the shell is not greater than 5 mm.

[0029] Furthermore, the combustion mechanism is coaxially arranged with the housing, and the end face of the combustion mechanism facing the housing is provided with an oil injection port. In the cross-sectional projection, the oil injection port is located inside the spiral ring of the coil.

[0030] Furthermore, a heat-resistant cover is provided on the outside of the housing.

[0031] 3. Beneficial effects

[0032] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0033] The cold fog spraying device of this invention utilizes a wide-diameter tube with a larger cavity to provide space for liquid vaporization, effectively releasing the high pressure generated within a confined space. This allows for a greater pressure difference across the coil, accelerating the liquid flow rate within the coil. Crystals precipitated within the coil are continuously flushed into the cavity of the wide-diameter tube, with many being ejected from the nozzle. Therefore, it effectively alleviates clogging within the coil. Furthermore, due to the large diameter of the wide-diameter tube, the presence of some scale buildup does not affect the device's operation. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the existing coil structure;

[0035] Figure 2 This is a schematic diagram of one embodiment of a cold fog spraying device;

[0036] Figure 3 This is a schematic diagram of one embodiment of the heating element;

[0037] Figure 4 for Figure 3 A cross-sectional view of the central heating element;

[0038] Figure 5 A schematic diagram showing a tightly arranged pipeline of equal diameter for the coil;

[0039] Figure 6 This is a schematic diagram of one connection method between the nozzle and the wide-diameter pipe.

[0040] Explanation of the labels in the diagram:

[0041] 11. Combustion mechanism; 12. Fan;

[0042] 2. Shell;

[0043] 3. Heating tube; 31. Wide-diameter tube; 311. Cavity; 32. Coil; 321. Additive tube;

[0044] 4. Nozzle; 41. Connector; 42. Nozzle;

[0045] 5. Handle. Detailed Implementation

[0046] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0047] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0048] Combination Figure 2 This embodiment provides a cold fog spraying device, including a combustion mechanism 11, a fan 12 located at both ends of the combustion mechanism 11, and a housing 2. A heating pipe 3 is installed inside the housing 2, and the heating pipe 3 is connected to a nozzle 4. The combustion mechanism 11 is generally a fuel-fired mechanism. Air is supplied to the combustion mechanism 11 by the fan 12, and the ignited flame burns inside the housing 2. This part of the structure can be implemented with reference to existing structures.

[0049] Combination Figure 3 The heating tube 3 used in this embodiment includes a wide-diameter tube 31 and a coil 32. The coil 32 is a spiral structure formed by the tube coiling around itself, extending spirally along the axial direction of the shell 2. The inner diameter of the coil 32 used in this embodiment is 3.8–6.8 mm, preferably 4–6.5 mm, for example 5 mm or 6 mm. Under the same flame intensity, compared to an inner diameter tube of about 3 mm, using an inner diameter tube of 4–6.5 mm will inevitably reduce its heating efficiency, thus delaying its vaporization time, thereby enabling it to cooperate with the wide-diameter tube 31.

[0050] Combination Figure 3 , Figure 4 As shown in the illustrated embodiment, the wide-diameter pipe 31 is a straight pipe structure, which is fitted inside the coil 32. Its tail end is close to the combustion mechanism 11, and the liquid inlet at the tail end of the wide-diameter pipe 31 is connected to the liquid outlet of the coil 32. The head end of the wide-diameter pipe 31 can extend from the cover plate for connecting to the nozzle 4. It is used to spray out high-temperature and high-pressure media to form atomized particles. The additive is initially heated in the coil 32, and after entering the wide-diameter pipe 31, it is further heated and a large amount of liquid vaporizes, and then it is sprayed to the outside through the nozzle 4 to form an atomization effect.

[0051] In one embodiment, the outer diameter of the wide-diameter tube 31 is 16–28 mm, and the inner diameter is not less than twice the inner diameter of the coil 32, for example, 16 mm or 22 mm, which can be controlled within three times the inner diameter of the coil 32, and the size is within 25 mm. The thickness of the wide-diameter tube 31 is generally within 1.2–2 mm, and unless otherwise specified, it can be considered to be within this range.

[0052] An annular flame channel is formed between the inner wall of the coil 32 and the wide-diameter pipe 31. The radial dimension of the flame channel is not less than 4 mm, generally within 18 mm, and preferably can be controlled within 8 to 12 mm.

[0053] For this flame channel, at least the pipes of the coil 32 are closely arranged on one side of the head end to guide the flame into the flame channel. At the head end, a large amount of flame is guided into the flame channel, and due to the closely arranged pipes in the coil 32, the flame will be ejected and burned within the flame channel, thereby increasing the heating intensity of the wide-diameter pipe 31 and causing the liquid inside it to vaporize.

[0054] The term "tightly arranged" does not require that there be no gaps between pipes; adjacent pipes can fit together. Due to factors such as deformation during processing, there may be some gaps between pipes. For example, gaps within 3mm are still considered within the scope of "tightly arranged".

[0055] In traditional solutions, such as patent 202322476199.2, a tightly arranged coil is used instead of a shell to preheat the liquid in order to increase waste heat utilization. In reality, this structure only serves to cool the external environment and does not improve thermal efficiency.

[0056] Because of the limited combustion space due to the outer casing of this type of steam atomizer, the air supplied by the fan is mainly injected outwards from the middle of the coil. Conventional thinking assumes that the outer flame has a higher temperature because it is in contact with air, resulting in the most complete combustion. However, inside the casing, since the fan supplies air from the middle, the inner flame actually has the highest temperature. Therefore, the straight pipe section experiences a higher temperature, allowing the internal liquid to vaporize. This also creates higher pressure, making it prone to scale buildup and blockage.

[0057] When using the improved wide-diameter tube 31, it is necessary to ensure that the liquid is primarily heated within the coil 32, while a large amount of liquid vaporizes within the wide-diameter tube 31. To achieve this, firstly, the coil 32 uses a pipe with an inner diameter of 3.8–6.8 mm, which reduces heating efficiency compared to a 3–3.5 mm pipe. Secondly, because the pipes in the coil 32 are closely arranged on one side of the tail end, the flame is concentrated within the flame channel, focusing on heating the wide-diameter tube 31. More heat can be absorbed and utilized, and a large amount of liquid can vaporize within the cavity 311 of the wide-diameter tube 31.

[0058] This design utilizes the larger cavity of the wide-diameter pipe 31 to provide space for liquid vaporization, effectively releasing the high pressure generated within the confined space. This, in turn, creates a greater pressure difference across the two ends of the coil 32, accelerating the liquid flow rate within the coil 32. Crystals precipitated within the coil 32 are continuously flushed into the cavity 311 of the wide-diameter pipe 31, with many being ejected from the nozzle 4. Therefore, it effectively alleviates blockage within the coil 32. Furthermore, due to the larger diameter of the wide-diameter pipe 31, the presence of some scale does not affect the device's operation, effectively reducing the frequency of cleaning.

[0059] In other words, this solution changes the existing method of scale removal. Existing technology uses chemical reagents for cleaning when the steam sprayer is not in operation; while this solution reduces the possibility of scale deposition when the steam sprayer is in operation, thereby achieving self-dissolution of scale; at the same time, it provides a larger volume space and reduces the frequency of cleaning.

[0060] In some embodiments, the end of the housing 2 has a flame cover plate, through which a wide-diameter tube 31 passes, allowing the nozzle 4 to be connected to the wide-diameter tube 31 from the outside of the flame cover plate, for example, by welding. Alternatively, the wide-diameter tube 31 is welded to one side of the flame cover plate, and the nozzle 4 is welded to the other side of the flame cover plate, with a connecting hole provided in the flame cover plate. Or, the nozzle 4 is connected to the wide-diameter tube 31 through the flame cover plate.

[0061] In one embodiment, the nozzle 4 is detachably mounted at the head end of the wide-diameter pipe 31. For better sealing, the wide-diameter pipe 31 can form an interface pipe with a small inner diameter, which can be in the range of 6-10 mm, facilitating the cleaning of accumulated dirt. A thread is formed at the interface pipe to connect it to the nozzle 4. The interface pipe can form a certain extension section, for example, penetrating the flame cover plate; or it can be directly welded to the flame cover plate and communicate with the cavity 311.

[0062] In another embodiment, the nozzle 4 is detachably mounted on the head end of the wide-diameter pipe 31, for example, in the form of a thread or pipe fitting; when the nozzle 4 is separated from the wide-diameter pipe 31, the end face cavity of the wide-diameter pipe 31 is completely open. This allows for direct cleaning of the deposits inside the cavity 311 using external tools.

[0063] Specifically, the nozzle 4 includes a connector 41 and a nozzle 42, the connector 41 being threadedly connected to the wide-diameter pipe 31. In one embodiment, such as Figure 6 As shown, connector 41 has an external thread structure, and an internal thread is provided at the end of the wide-diameter pipe 31 to achieve the connection between the two. In another embodiment, connector 41 can be a larger pipe opening with an internal thread, and an external thread is provided at the end of the wide-diameter pipe 31 to achieve the connection between the two.

[0064] Figure 6 The nozzle 4 shown is merely an example and does not imply that it only has a connector 41 and a nozzle 42. In actual implementation, the nozzle 4 may be formed by combining different components, the connector 41 may consist of multiple parts, and the form of the nozzle 42 may also vary without specific limitations.

[0065] In conjunction with the above embodiments, to prevent the flame from shooting forward, a cover plate is connected to the first end of the housing 2, and the end of the wide-diameter pipe 31 passes through the cover plate, with the cover plate connected to the housing 2. The coil 32 can be led out from the end notch of the housing 2 and connected to the external additive box through the additive pipe 321. In a preferred embodiment, for ease of fixing, the ends of both the wide-diameter pipe 31 and the coil 32 pass through the cover plate.

[0066] In one embodiment, the length of the section where the coils 32 are closely arranged is L, which is one-third of the length of the coil 32. Within the remaining length, a gap of 3-5 mm, or even larger, can be formed between adjacent pipes in the coil 32. For example, within this length range, the closely arranged coils 32 can maintain the flame surrounding the outer periphery of the wide-diameter pipe 31, providing stronger heating conditions for the wide-diameter pipe 31. This compensates for the problem of low heat absorption efficiency caused by the increased inner diameter.

[0067] In another feasible approach, the length L is 2 / 3 of the length of the coil 32, and the remaining pipe sections form a large gap to allow the flame to pass through.

[0068] Furthermore, it allows for a tighter arrangement of pipes throughout the entire coil 32, such as... Figure 5 As shown. In this embodiment, the coil 32 has a certain distance between its first end and the cover plate, thus providing a channel for flame outflow. Since the flame needs to exhaust gas to the outside of the housing 2, the gaps or reserved distances between the pipes allow the flame smoke at the first end to be quickly discharged to the outside of the housing, preventing the formation of high pressure inside the housing 2.

[0069] At the tail end, the liquid outlet of the coil 11 can be connected to the end face of the wide-diameter pipe 31. More preferably, the liquid outlet of the coil 11 is connected to the tail end side wall of the wide-diameter pipe 31, and the distance between the tail end of the wide-diameter pipe 31 and the end face of the combustion mechanism 11 is not less than 20mm, forming a fuel injection zone to guide the flame. This distance can be controlled within the range of 20-45mm.

[0070] In existing coil structures, the small pipe diameter does not affect flame combustion. However, in this application, the large diameter of the wide-diameter pipe 31 obstructs the fuel injected by the combustion mechanism 11. If the distance to the end face of the combustion mechanism 11 is too close, a large amount of injected fuel will directly hit the end face of the wide-diameter pipe 31, forming oil droplets concentrated at the tail end, reducing the completeness of combustion. By creating a certain spacing, the impact on fuel injection is reduced, allowing the flame to burn within the flame channel and improving the heat intensity.

[0071] In combination with the above embodiments, each spiral ring that makes up the coil 32 has a constant diameter structure, and a gap is formed between the pipes on one side of the coil 32 to allow the flame to pass through.

[0072] In one specific embodiment, the provided cold fog spraying device includes a fan 12, a combustion mechanism 11, a housing 2, and a nozzle 4 arranged sequentially. A heating tube 3 is installed inside the housing 2 and is connected to the nozzle 4. The heating tube 3 includes a wide-diameter tube 31 and a coil 32. The tail end of the wide-diameter tube 31 is close to the combustion mechanism 11, and the liquid inlet at the tail end of the wide-diameter tube 31 is connected to the liquid outlet of the coil 32. The wide-diameter tube 31 has a straight tube structure, and the coil 32 is wrapped around the outer circumference of the wide-diameter tube 31. At least the pipes on the first end of the coil 32 are closely arranged, forming an annular flame channel between the inner wall of the coil 32 and the wide-diameter tube 31.

[0073] The inner diameter of the coil 32 is 3.8 to 6.8 mm, and the inner diameter of the wide-diameter pipe 31 is 2.2 to 5.0 times that of the inner diameter of the coil 32, so that the wide-diameter pipe 31 forms an expansion and pressure reduction space relative to the coil 32; the nozzle 4 is detachably connected to the head end of the wide-diameter pipe 31 and is used to spray out the high-temperature and high-pressure medium to form atomized particles.

[0074] In implementation, the blower 12 can be connected to the tail end or side of the combustion mechanism 11 to supply air to the combustion mechanism 11. Fuel and air are mixed and blown out, injected into the housing 2, and burned within the housing 2. The liquid inlet of the coil 32 is connected to an external additive tank via an additive pipe 321, supplying additives to the coil 32. The additives are heated inside the coil 32, with a small amount vaporizing. A large amount of liquid is heated to a high temperature as it flows towards the liquid outlet of the coil 32, enters the wide-diameter pipe 31 for further heating and vaporization, and is then sprayed out from the nozzle 42 to achieve an atomization effect.

[0075] In one embodiment, the pipes of the coil 32 are closely arranged on the first end side to guide the flame into the flame channel; gaps are formed between the pipes of the coil 32 near the tail end side to allow the flame to pass through, and the length L of the closely arranged section is 4 / 5 of the length of the coil 32. In another embodiment, the coil 32 has a uniform diameter structure, the pipes of the coil 32 are arranged at equal intervals, and adjacent pipes are closely arranged to guide the flame into the flame channel.

[0076] The outer diameter of the wide-diameter tube 31 is 15-25 mm, the distance between the inner wall of the coil 32 and the wide-diameter tube 31 is 6-15 mm, and the distance between the coil 32 and the inner wall of the shell 2 is 1-5 mm.

[0077] Furthermore, preferably, the combustion mechanism 11 is coaxially arranged with the housing 2, and the end face of the combustion mechanism 11 facing the housing 2 is provided with an oil injection port. In the cross-sectional projection, the oil injection port is located inside the spiral ring of the coil 32. This allows the flame to be better guided into the flame channel.

[0078] Compared to existing technologies, this embodiment allows for a more compact arrangement of pipes in some coils 32, with coils 32 primarily receiving heat on one side. Furthermore, by increasing the diameter of the coils 32, the heat absorption efficiency of the liquid within the coils 32 is reduced, enabling the liquid to rapidly vaporize in the wide-diameter pipe 31. Simultaneously, the amount of heat transferred to the housing 2 is reduced, also providing a scalding-proof effect. When operating the handle 5 on the outside of the housing 2, burns are less likely.

[0079] Furthermore, as a protective measure, a heat shield can be installed on the outside of the housing 2. The heat shield can have a large number of ventilation holes to facilitate heat dissipation and reduce the surface temperature of the housing 2.

[0080] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A cold fogging machine spraying device, comprising a combustion mechanism (11), and a fan (12) and a shell (2) located at both ends of the combustion mechanism (11) respectively, a heating pipe (3) is installed in the shell (2), and the heating pipe (3) is communicated with a spray head (4); characterized in that, The heating tube (3) includes a wide-diameter tube (31) and a coil (32); The coil (32) has a spiral structure and extends spirally along the axial direction of the shell (2). The inner diameter of the coil (32) is 3.8 to 6.8 mm. The wide-diameter pipe (31) is a straight pipe structure with an outer diameter of 16-28 mm and an inner diameter not less than twice the inner diameter of the coil (32). The wide-diameter pipe (31) is fitted inside the coil (32), and its tail end is close to the combustion mechanism (11). The liquid inlet at the tail end of the wide-diameter pipe (31) is connected to the liquid outlet of the coil (32). An annular flame channel is formed between the inner wall of the coil (32) and the wide-diameter pipe (31), and the radial dimension of the flame channel is not less than 4 mm; at least the pipes on the first end side of the coil (32) are closely arranged to guide the flame into the flame channel. The nozzle (4) is connected to the head end of the wide-diameter pipe (31) and is used to spray out the high-temperature and high-pressure medium to form atomized particles.

2. A cold fogging machine spray device according to claim 1, wherein: The nozzle (4) is detachably mounted at the head end of the wide-diameter pipe (31).

3. A cold fogging machine spray device according to claim 2, wherein: The nozzle (4) includes a connector (41) and a nozzle (42), and the connector (41) is connected to the wide-diameter pipe (31) by means of a threaded connection.

4. A cold fogging machine spray device according to claim 1, wherein: The first end of the housing (2) is connected to a flame cover plate, and the ends of the wide-diameter pipe (31) and the coil (32) pass through the flame cover plate, and the flame cover plate is connected to the housing (2).

5. A cold fogging machine spray device according to claim 1, wherein: The length of the section where the coils (32) are closely arranged is L, and the length L is not less than 1 / 3 of the length of the coils (32).

6. A cold fogging machine dispensing device according to claim 5, wherein: The liquid outlet of the coil (11) is connected to the side wall of the tail end of the wide-diameter pipe (31). The distance between the tail end of the wide-diameter pipe (31) and the end face of the combustion mechanism (11) is not less than 20mm, forming a fuel injection zone to guide the flame.

7. A cold fogging machine dispensing device according to claim 6, wherein: Each spiral ring that makes up the coil (32) has a uniform diameter structure, and a gap is formed between the pipes on one side of the coil (32) to allow the flame to pass through.

8. A cold fogging machine spray device characterized by: The device includes a fan (12), a combustion mechanism (11), a housing (2), and a nozzle (4) arranged in sequence. A heating tube (3) is installed inside the housing (2), and the heating tube (3) is connected to the nozzle (4). The heating tube (3) includes a wide-diameter tube (31) and a coil (32). The tail end of the wide-diameter tube (31) is close to the combustion mechanism (11), and the liquid inlet at the tail end of the wide-diameter tube (31) is connected to the liquid outlet of the coil (32). The wide-diameter pipe (31) has a straight pipe structure, and the coil (32) is wrapped around the outer circumference of the wide-diameter pipe (31). At least the coil (32) is closely arranged between the pipes on the first end side, forming an annular flame channel between the inner wall of the coil (32) and the wide-diameter pipe (31). The inner diameter of the coil (32) is 4.0 to 6.5 mm, and the inner diameter of the wide-diameter pipe (31) is 2.2 to 5.0 times the inner diameter of the coil (32), so that the wide-diameter pipe (31) forms an expansion and pressure reduction space relative to the coil (32). The nozzle (4) is detachably connected to the head end of the wide-diameter pipe (31) and is used to spray out high-temperature and high-pressure media to form atomized particles.

9. A cold fogging machine dispensing device according to claim 8, wherein: The coil (32) has pipes closely arranged on one side of the head end to guide the flame into the flame channel; gaps are formed between the pipes on the side of the coil (32) near the tail end for the flame to pass through; or, The pipes between the coils (32) are arranged at equal intervals and adjacent pipes are arranged closely together to guide the flame to the flame channel.

10. A cold fogging machine dispensing device according to claim 9, wherein: The outer diameter of the wide-diameter tube (31) is 16-28 mm, the distance between the inner wall of the coil (32) and the wide-diameter tube (31) is not less than 4 mm, and the distance between the coil (32) and the inner wall of the shell (2) is not greater than 5 mm.

11. A cold fogging machine dispensing apparatus as defined in claim 8 wherein: The combustion mechanism (11) is coaxially arranged with the housing (2). The end face of the combustion mechanism (11) facing the housing (2) is provided with an oil injection port. In the cross-sectional projection, the oil injection port is located inside the spiral ring of the coil (32).

12. A cold fogging machine dispensing apparatus as defined in claim 8 wherein: A heat shield is provided on the outside of the housing (2).

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