A hot air heating device

Abstract

The application discloses a hot air heating device, and relates to the technical field of grain drying, which comprises a shell, a combustion cylinder, a burner, a wind volume adjusting mechanism and an air induction mechanism. One end of the shell is provided with a mixing cavity. The combustion cylinder is axially arranged in the shell, and a second annular gap and a first annular gap are sequentially arranged between the outer periphery of the combustion cylinder and the inner periphery of the shell. One end of the first annular gap is communicated with the atmosphere, the other end of the first annular gap is communicated with one end of the second annular gap, the other end of the second annular gap and the outlet of the combustion cylinder are both communicated with the air inlet one of the mixing cavity. The burner is connected with the combustion cylinder and is used for generating high-temperature gas. The wind volume adjusting mechanism is communicated with the air inlet two of the mixing cavity. The air inlet of the air induction mechanism is communicated with the air outlet of the mixing cavity, and the air induction mechanism drives external air to flow through the first annular gap, the second annular gap and then enter the mixing cavity, and the air induction mechanism introduces the high-temperature gas generated by the combustion cylinder into the mixing cavity. The application can effectively reduce heat loss, guarantee sufficient combustion of fuel and realize precise temperature control.

Description

Technical Field

[0001] This invention relates to the field of grain drying technology, and in particular to a hot air heating device. Background Technology

[0002] Grain drying is a crucial step in reducing post-harvest losses and ensuring grain quality. Oil-fired, gas-fired, and synthetic oil heating systems are commonly used heat sources for grain drying systems due to their advantages such as rapid start-up, stable combustion, fast temperature control response, and strong site adaptability. They often employ direct combustion or indirect heat exchange methods, quickly providing clean hot air to meet the needs of continuous drying operations. However, traditional heating systems still have the following shortcomings in practical applications:

[0003] The thermal efficiency is low and the heat loss is large. The device shell is mostly made of conventional insulation materials or simple structure. Heat is easily lost to the environment through radiation and convection of the outer wall surface, resulting in a decrease in effective heat utilization rate, high operating energy consumption, and easy dust accumulation on the heat exchange surface, requiring frequent maintenance.

[0004] Incomplete combustion and low fuel utilization; the combustion control and air distribution structure design of some equipment are not optimized enough, and the oxygen supply in the combustion chamber is uneven or insufficient, resulting in incomplete combustion of fuel, which wastes energy and affects the quality of hot air output. Under varying operating conditions, temperature fluctuations are large and temperature control accuracy is insufficient. When the drying load, environmental conditions, or fuel supply change, traditional equipment lacks a flexible and precise airflow regulation mechanism, resulting in significant temperature fluctuations in the mixed hot air, which affects the uniformity and stability of grain drying.

[0005] It is difficult to simultaneously meet the requirements of high efficiency, energy saving, low carbon emissions, and economy, and there is a gap between these and the development needs of modern grain drying, which require precise temperature control, low consumption and environmental protection, and intelligent and stable operation.

[0006] Therefore, developing a heating device that can effectively reduce heat loss, ensure complete fuel combustion, and achieve precise temperature control is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the present invention proposes a hot air heating device, which aims to solve at least one of the above-mentioned technical problems.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a hot air heating device, comprising: A housing, one end of which is provided with a mixing chamber; A combustion chamber is axially disposed inside the housing. A second annular gap and a first annular gap are arranged radially from the inside to the outside between the outer periphery of the combustion chamber and the inner periphery of the housing, and the second annular gap and the first annular gap are radially isolated. One end of the first annular gap is connected to the external atmosphere, and the other end of the first annular gap is connected to one end of the second annular gap. The other end of the second annular gap and the outlet of the combustion chamber are both connected to the air inlet of the mixing chamber. A burner, connected to the combustion chamber, is used to supply fuel into the combustion chamber to generate high-temperature combustion gases; An air volume regulating mechanism is connected to and communicates with the second air inlet of the mixing chamber, and is used to regulate and control the amount of outside air entering the mixing chamber; The air intake of the air intake mechanism is connected to the air outlet of the mixing chamber. It is used to create a negative pressure inside the mixing chamber and the housing to drive the outside air to flow through the first annular gap and the second annular gap in sequence and enter the mixing chamber. It also introduces the high-temperature combustion gas generated by the combustion cylinder into the mixing chamber, so that the high-temperature combustion gas mixes with the outside air in the mixing chamber.

[0009] This invention proposes a novel hot air generation process. Driven by the negative pressure generated by the induced draft mechanism, outside air flows sequentially through the first and second annular gaps. Simultaneously, the burner generates high-temperature combustion gas within the combustion chamber. The two airflows are then uniformly mixed within the mixing chamber. By setting radially isolated and sequentially connected first and second annular gaps, the flowing outside air forms two dynamic heat insulation layers with opposite flow directions: the airflow within the second annular gap provides primary insulation for the high-temperature combustion chamber and rapidly and dynamically transfers the radially dissipated heat from the combustion chamber to the mixing chamber; the airflow within the first annular gap provides secondary insulation for the high-temperature combustion chamber, further preventing heat loss. Compared to traditional solid insulation materials, the flowing air layer offers superior insulation performance, significantly reducing heat loss and improving thermal efficiency. Furthermore, the airflow regulation mechanism precisely controls the amount of cold air entering the mixing chamber, thereby accurately regulating the temperature of the mixed hot air, achieving high efficiency, energy saving, and precise temperature control.

[0010] As a further improvement to the above technical solution, the shell includes an outer cylinder, an annular vent flange, a sealing plate, and an inner cylinder; The annular vent flange is coaxial and adapted to be connected to one end of the outer cylinder, and the sealing plate is adapted to cover the other end of the outer cylinder; the inner cylinder is coaxially disposed inside the outer cylinder, and one end of the inner cylinder is adapted to pass through the annular hole of the annular vent flange and extend to the outside of the outer cylinder to form a mixing cavity; the inner cylinder and the sealing plate are spaced apart along the axial direction; a first annular gap is formed between the inner peripheral wall of the outer cylinder and the corresponding outer peripheral wall of the inner cylinder; the annular vent flange is provided with an air inlet mesh that connects the first annular gap with the outside air; The combustion cylinder is coaxially disposed inside the outer cylinder and the inner cylinder; a second annular gap is formed between the outer peripheral wall of the combustion cylinder and the corresponding inner peripheral wall of the inner cylinder; a sealing body is adapted to seal the end of the combustion cylinder away from the mixing chamber. The burner is located outside the housing, and its gas pipe passes through the sealing plate and the enclosure in sequence and extends into the combustion chamber.

[0011] The beneficial effects of the above technical solution are as follows: By coaxially arranging the outer cylinder, inner cylinder, and combustion cylinder, two independent airflow channels—the first annular gap and the second annular gap—are precisely constructed. The air inlet mesh on the annular vent flange effectively prevents foreign objects from being drawn into the device, ensuring operational safety. One end of the inner cylinder passes through the annular vent flange and extends to the outside of the outer cylinder, naturally forming a mixing chamber with a compact structure and optimized hot air mixing area. The burner's gas pipe passes sequentially through the sealing plate and the enclosure before entering the combustion cylinder, ensuring the sealing and stability of the fuel supply while facilitating disassembly and maintenance.

[0012] As a further improvement to the above technical solution, the enclosure is a heat-insulating enclosure; the outer peripheral wall of the combustion cylinder is provided with oxygen-enriching through holes.

[0013] The beneficial effects of the above technical solution are as follows: The use of a heat-insulating enclosure effectively blocks the radiative heat transfer from the high temperature inside the combustion chamber towards the burner, thus protecting the burner and extending its service life. Oxygen-enriching holes are provided on the outer peripheral wall of the combustion chamber, allowing some outside air from the second annular gap to enter the combustion chamber, providing sufficient oxygen for fuel combustion, thereby promoting complete combustion, reducing the emission of incomplete combustion products and harmful gases, and achieving the goal of green environmental protection.

[0014] As a further improvement to the above technical solution, it also includes an inner and outer cylinder connecting angle plate, one end of which is detachably connected to the other end of the inner cylinder, and the other end of which is detachably connected to the inner wall of the outer cylinder. The outer circumferential side of the annular vent flange is detachably connected to one end of the outer cylinder, and the inner circumferential side of the annular vent flange is detachably connected to the outer circumferential wall of the inner cylinder.

[0015] The beneficial effects of the above technical solution are as follows: by using the detachable connection method of the inner and outer cylinder connecting angle plate and the annular vent flange, the outer cylinder, inner cylinder, and annular vent flange are firmly connected into one unit, ensuring coaxiality and structural strength. The detachable connection structure greatly facilitates the installation, disassembly, and regular maintenance of the internal components, effectively reducing maintenance difficulty and cost.

[0016] As a further improvement to the above technical solution, a heat-resistant support assembly is also included. The heat-resistant support assembly is disposed between the outer peripheral wall of the combustion cylinder and the corresponding inner peripheral wall of the inner cylinder to support the combustion cylinder. The heat-resistant support assembly is provided with an air passage along a direction parallel to the axial direction of the combustion cylinder.

[0017] The beneficial effects of the above technical solution are as follows: the heat-resistant support assembly firmly supports the combustion cylinder inside the inner cylinder, ensuring that the two remain coaxial, thereby forming a second annular gap of uniform width. The air passages arranged axially on the support assembly ensure that the airflow in the second annular gap can pass smoothly, avoiding airflow blockage caused by the support structure, and ensuring the uniformity of the heat preservation effect and the stability of the airflow.

[0018] As a further improvement to the above technical solution, the heat-resistant support assembly includes a heat-resistant arc-shaped beam and a beam bracket; the beam bracket is disposed at the bottom of the inner cylinder's inner peripheral wall, the heat-resistant arc-shaped beam is disposed at the top of the beam bracket, and the top of the heat-resistant arc-shaped beam is supported on the lower part of the outer peripheral wall of the combustion cylinder. The lower part of the beam bracket is provided with multiple air passages along a direction parallel to the axial direction of the combustion cylinder; the multiple air passages are arranged at intervals along the circumference of the combustion cylinder.

[0019] The beneficial effects of the above technical solution are as follows: the heat-resistant arc-shaped beam can be constructed using refractory materials in a contour-following manner, possessing excellent heat insulation performance and resistance to thermal deformation, enabling it to stably support the combustion chamber at high temperatures for extended periods. The beam support adopts a bridge-like structural design, with multiple air passages at its lower part not only ensuring uniform and smooth airflow but also further enhancing the heat insulation effect, effectively preventing localized overheating, and significantly extending the service life of the support components and the entire device.

[0020] As a further improvement to the above technical solution, the sealing plate includes an adjusting ring plate and an inspection plate; the adjusting ring plate is adapted to be fixed at the other end of the outer cylinder; the inspection plate is adapted to block the annular hole of the adjusting ring plate; the adjusting ring plate is provided with multiple sets of adjusting air holes corresponding to the second annular gap and the first annular gap; the multiple sets of adjusting air holes are evenly distributed along the circumference of the sealing plate; the inspection plate is provided with a through hole corresponding to the center line of the combustion cylinder; the gas pipe of the burner can be adapted to pass through the through hole.

[0021] The beneficial effects of the above technical solution are as follows: The split design of the sealing plate clearly defines the functions of the adjusting ring plate and the inspection panel. Multiple sets of adjusting air holes on the adjusting ring plate can fine-tune the airflow entering the first and second annular gaps, ensuring uniform airflow distribution in both layers and optimizing the insulation effect. The inspection panel is detachable, and the through holes on it provide an interface for burner installation, while also facilitating direct inspection of the combustion chamber interior after disassembly, thus improving maintainability.

[0022] As a further improvement to the above technical solution, the inspection panel is provided with observation and cooling holes corresponding to the combustion cylinder cavity.

[0023] The beneficial effects of the above technical solution are as follows: the observation and cooling holes have dual functions. On the one hand, operators can directly observe the combustion state inside the combustion chamber through the observation and cooling holes, facilitating timely adjustment of combustion parameters; on the other hand, the observation and cooling holes allow some ambient air to flow in, which cools and dissipates heat from the burner end and the inspection panel itself, preventing overheating damage and heat loss, and improving the safety, operability, and operational reliability of the equipment. Under negative pressure, the outside cold air entering through the observation and cooling holes is warmed up and can enter the mixing chamber through the second annular gap, further improving the energy-saving effect.

[0024] As a further improvement to the above technical solution, the mixing chamber is cylindrical and coaxially arranged with the combustion cylinder; the opening of the mixing chamber near the combustion cylinder is an air inlet one, and the opening of the mixing chamber away from the combustion cylinder is an air outlet; multiple air inlets are arranged on the outer peripheral wall of the mixing chamber, and the multiple air inlets are spaced apart and evenly arranged along the circumference of the mixing chamber. The air volume adjustment mechanism includes a drive motor and an adjustment cylinder; the adjustment cylinder is coaxially rotatably sleeved on the outer peripheral wall of the mixing chamber, and the outer peripheral wall of the adjustment cylinder is provided with a plurality of air inlet holes, which are spaced apart and evenly arranged along the circumference of the adjustment cylinder; the shaft of the drive motor is connected to the adjustment cylinder for driving the adjustment cylinder to rotate, thereby making the plurality of air inlet holes correspondingly connected or misaligned with the plurality of air inlets, thereby adjusting the opening degree of the air inlets.

[0025] The beneficial effects of the above technical solution are: precise control of the mixing temperature can be achieved by utilizing the air volume adjustment mechanism. The drive motor rotates the adjustment cylinder, which precisely controls the overlap area between the air inlet and the second air inlet on the mixing chamber, thereby linearly adjusting the amount of outside cold air entering. Based on the target temperature required for production, the mixing ratio of hot and cold air can be adjusted in real time and precisely, effectively solving the pain points of large temperature fluctuations and inaccurate control in traditional equipment, and ensuring the stability of the drying process.

[0026] As a further improvement to the above technical solution, a controller is also included, which is electrically connected to the drive motor to control its rotation.

[0027] The beneficial effects of the above technical solution are: the introduction of a controller to automate the drive motor eliminates the need for manual intervention in the entire airflow adjustment process. The controller can automatically send commands to the drive motor based on preset temperature parameters or real-time temperature feedback from sensors, driving the regulating cylinder to move precisely, achieving rapid response and closed-loop accurate temperature control. This significantly improves the intelligence level and temperature control efficiency of the device, meeting the development needs of modern grain drying for intelligent and stable control.

[0028] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a hot air heating device, which has the following advantages and beneficial effects.

[0029] 1. This invention establishes a dynamic air insulation layer by setting up a first annular gap and a second annular gap that are radially isolated and sequentially connected. An air-drawing mechanism drives outside air to flow sequentially through the two annular gaps. The air flowing through the second annular gap provides primary insulation for the radial heat dissipation of the high-temperature combustion chamber, while the air flowing through the first annular gap provides secondary insulation. Compared to traditional solid insulation materials, the flowing air layer offers superior insulation, significantly reducing heat loss and greatly improving thermal efficiency, thus achieving the goal of energy saving and consumption reduction.

[0030] 2. The present invention provides oxygen-enriching through holes on the outer peripheral wall of the combustion cylinder, allowing some air in the second annular gap to enter the combustion cylinder, providing sufficient oxygen for fuel combustion, ensuring complete combustion of fuel, effectively reducing the emission of incomplete combustion products and harmful gases such as nitrogen oxides, and using green heat sources such as natural gas, diesel, and synthetic oil as fuel, which meets the requirements of green environmental protection.

[0031] 3. This invention employs an airflow regulation mechanism consisting of a drive motor and an regulating cylinder. The drive motor rotates the regulating cylinder, precisely controlling the overlap area between the air inlet orifice and the second air inlet on the mixing chamber, thereby linearly regulating the amount of external cold air entering. Based on the target temperature required for production, the mixing ratio of hot and cold air can be adjusted in real time and precisely, solving the problems of large temperature fluctuations and inaccurate control in traditional equipment, achieving precise temperature control, and ensuring the stability of the grain drying process.

[0032] 4. This invention uses detachable connection structures such as inner and outer cylinder connecting angle plates and annular vent flanges to firmly connect the outer cylinder, inner cylinder and combustion cylinder into one unit. At the same time, the sealing plate adopts a separate design of adjustment ring plate and inspection plate. The inspection plate is provided with observation and cooling holes, which not only facilitates installation, disassembly and internal maintenance, but also allows direct observation of the combustion status and cooling of the burner end, significantly improving the maintainability, safety and operation convenience of the device.

[0033] 5. This invention further configures a controller, which is electrically connected to the drive motor, to achieve automated closed-loop control of airflow regulation. The controller can automatically drive the motor according to preset parameters or real-time temperature feedback, quickly responding and accurately maintaining the target temperature, significantly improving the intelligence level and temperature control efficiency of the device, and meeting the development needs of modern grain drying for intelligent, stable, and efficient heating devices. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0035] Figure 1 This is an axial sectional view of the overall structure of a hot air heating device according to the present invention.

[0036] Figure 2 This is a schematic diagram of the annular vent flange structure of a hot air heating device according to the present invention.

[0037] Figure 3 This is a schematic diagram of the regulating ring plate structure of a hot air heating device according to the present invention.

[0038] Figure 4 This is a schematic diagram of the combustion cylinder structure of a hot air heating device according to the present invention.

[0039] Figure 5 This is a schematic diagram of the assembly structure of the outer cylinder, inner cylinder, and connecting angle plate of the inner and outer cylinders of a hot air heating device according to the present invention.

[0040] Figure 6 This is a schematic diagram of the heat-resistant support component structure of a hot air heating device according to the present invention.

[0041] Figure 7 This is a schematic diagram of the inspection panel structure of a hot air heating device according to the present invention.

[0042] In the diagram: 1. Shell; 11. Outer cylinder; 111. First annular gap; 112. Inner flange of outer cylinder; 113. Outer cylinder support; 12. Annular vent flange; 121. Outer ring; 122. Inner ring; 123. Steel mesh; 124. Connecting strip; 13. Sealing plate; 131. Adjusting ring plate; 1311. Adjusting air hole group; 132. Inspection panel; 1321. Through hole; 1322. Observation and cooling hole; 133. Welding nut; 14. Inner cylinder; 141. Mixing chamber; 1411. Air inlet. 1. Inlet 1; 1412. Inlet 2; 1413. Outlet; 1414. Annular groove; 142. Second annular gap; 143. Outer flange of inner cylinder; 144. Inner flange of inner cylinder; 2. Combustion cylinder; 21. Sealing body; 22. Oxygen-enriching through hole; 3. Burner; 31. Gas pipe; 4. Inner and outer cylinder connecting angle plate; 5. Heat-resistant support assembly; 51. Heat-resistant arc beam; 52. Beam bracket; 521. Air passage; 6. Air volume adjustment mechanism; 61. Drive motor; 62. Adjusting cylinder; 621. Inlet through hole. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0044] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 invention 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 invention.

[0045] 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 invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] According to embodiments of the present invention, such as Figures 1 to 7 As shown, a hot air heating device includes: a shell 1, a combustion cylinder 2, a burner 3, an air volume regulating mechanism 6, and an induced draft mechanism.

[0048] A mixing chamber 141 is provided at one end of the housing 1.

[0049] The combustion cylinder 2 is axially disposed inside the housing 1. A second annular gap 142 and a first annular gap 111 are arranged radially from the inside to the outside between the outer periphery of the combustion cylinder 2 and the inner periphery of the housing 1, and the second annular gap 142 and the first annular gap 111 are radially isolated from each other. One end of the first annular gap 111 is connected to the external atmosphere, and the other end of the first annular gap 111 is connected to one end of the second annular gap 142. The other end of the second annular gap 142 and the outlet of the combustion cylinder 2 are both connected to the air inlet 1411 of the mixing chamber 141.

[0050] The burner 3 is connected to the combustion chamber 2 and is used to supply fuel into the combustion chamber 2 to generate high-temperature combustion gases.

[0051] The air volume regulating mechanism 6 is connected to and communicates with the air inlet 1412 of the mixing chamber 141, and is used to regulate and control the amount of outside air entering the mixing chamber 141.

[0052] The air inlet of the induced draft mechanism is connected to the air outlet 1413 of the mixing chamber 141, which is used to create a negative pressure inside the mixing chamber 141 and the shell 1, so as to drive the outside air to flow through the first annular gap 111 and the second annular gap 142 in sequence and enter the mixing chamber 141, and introduce the high-temperature combustion gas generated by the combustion cylinder 2 into the mixing chamber 141, so that the high-temperature combustion gas and the outside air are mixed in the mixing chamber 141.

[0053] The outside air flowing through the second annular gap 142 is used to provide primary insulation for the combustion cylinder 2, and the outside air flowing through the first annular gap 111 is used to provide secondary insulation for the shell 1.

[0054] This embodiment proposes a novel hot air generation process. Driven by the negative pressure generated by the induced draft mechanism, outside air flows sequentially through the first annular gap 111 and the second annular gap 142. Simultaneously, the burner 3 generates high-temperature combustion gas within the combustion cylinder 2. The two airflows are then uniformly mixed within the mixing chamber 141. By setting radially isolated and sequentially connected first and second annular gaps 111 and 142, the flowing outside air forms two dynamic insulation layers with opposite flow directions: the airflow within the second annular gap 142 provides primary insulation for the high-temperature combustion cylinder 2 and rapidly and dynamically transfers the radially dissipated heat from the combustion cylinder 2 to the mixing chamber 141; the airflow within the first annular gap 111 provides secondary insulation for the high-temperature combustion cylinder 2 and the shell 1, further preventing heat loss. Compared to traditional solid insulation materials, this dynamic air curtain insulation layer, formed by the flowing air layer and achieving tiered heat recovery, provides superior insulation, significantly reduces heat loss from the device, and improves thermal efficiency. Meanwhile, the air volume regulating mechanism 6 can precisely control the amount of cold air entering the mixing chamber 141, thereby accurately regulating the temperature of the mixed hot air and achieving the technical effects of high efficiency, energy saving and precise temperature control.

[0055] Specifically, the induced draft mechanism is also used to transport the hot air in the mixing chamber 141 to the drying chamber of the grain drying device; the induced draft mechanism can be an induced draft fan 7.

[0056] In some embodiments, the housing 1 includes an outer cylinder 11, an annular vent flange 12, a sealing plate 13, and an inner cylinder 14; An annular vent flange 12 is coaxially and adapted to be connected to one end of the outer cylinder 11, and a sealing plate 13 is adapted to cover the other end of the outer cylinder 11; an inner cylinder 14 is coaxially disposed inside the outer cylinder 11, and one end of the inner cylinder 14 is adapted to pass through the annular hole of the annular vent flange 12 and extend to the outside of the outer cylinder 11 to form a mixing chamber 141; the inner cylinder 14 and the sealing plate 13 are spaced apart along the axial direction; a first annular gap 111 is formed between the inner peripheral wall of the outer cylinder 11 and the corresponding outer peripheral wall of the inner cylinder 14; the annular vent flange 12 is provided with an air inlet mesh that connects the first annular gap 111 with the outside air; The combustion cylinder 2 is coaxially arranged inside the outer cylinder 11 and the inner cylinder 14; a second annular gap 142 is formed between the outer peripheral wall of the combustion cylinder 2 and the corresponding inner peripheral wall of the inner cylinder 14; a sealing body 21 is adapted to seal the end of the combustion cylinder 2 away from the mixing chamber 141. The burner 3 is located outside the housing 1 and its gas pipe 31 passes through the sealing plate 13 and the enclosure 21 in sequence and extends into the combustion cylinder 2 cavity.

[0057] By coaxially arranging the outer cylinder 11, inner cylinder 14, and combustion cylinder 2, two independent airflow channels, the first annular gap 111 and the second annular gap 142, are precisely constructed. The air inlet mesh on the annular vent flange 12 effectively prevents foreign objects from being drawn into the device, ensuring operational safety. One end of the inner cylinder 14 passes through the annular hole of the annular vent flange 12 and extends to the outside of the outer cylinder 11, naturally forming a mixing chamber 141. This compact structure optimizes the hot air mixing area. The combustion gas pipe 31 of the burner 3 passes sequentially through the sealing plate 13 and the sealing body 21 into the combustion cylinder 2, ensuring the sealing and stability of the fuel supply while facilitating disassembly and maintenance.

[0058] Specifically, the outer cylinder 11, the annular vent flange 12, the sealing plate 13, and the inner cylinder 14 are all circular. The sealing plate 13 is coaxially fitted to cover the other end of the outer cylinder 11; the outer peripheral wall of the sealing plate 13 is fitted and welded to the inner peripheral wall of the other end of the outer cylinder 11.

[0059] An inner flange 112 is coaxially fixed to the inner circumferential wall of one end of the outer cylinder 11. The annular vent flange 12 includes an outer ring 121, an inner ring 122, and a steel mesh 123. The inner ring 122 is coaxially nested inside the outer ring 121, and the outer ring 121 and the inner ring 122 are welded and fixed together by connecting strips 124 to form an integral hollow annular structure. The steel mesh 123 is annular and is welded and fixed to the outer ring 121 and the inner ring 122 in a contour-fitting manner, covering the hollow area between the outer ring 121 and the inner ring 122. The mesh of the steel mesh 123 is an air inlet mesh. The outer ring 121 is coaxially and fitably fixed to the inner flange 112 of the outer cylinder by bolts. One end of the inner cylinder 14 fits through the annular hole of the inner ring 122 and extends to the outside of the outer cylinder 11 to form a mixing chamber 141. The outer flange 143 of the inner cylinder is coaxially welded and fixed to the outer peripheral wall of the inner cylinder 14 at the location corresponding to the inner ring 122. The inner ring 122 is coaxially and adaptively fixed to the outer flange 143 of the inner cylinder by bolts.

[0060] In some embodiments, the enclosure 21 is a heat-insulating enclosure made of heat-insulating material; the outer peripheral wall of the combustion cylinder 2 is provided with oxygen-enriching through holes 22.

[0061] The use of a heat-insulating enclosure 21 effectively blocks the radiative heat transfer from the high temperature inside the combustion cylinder 2 to the burner 3, thus protecting the burner 3 and extending its service life. Oxygen-enriching holes 22 are provided on the outer peripheral wall of the combustion cylinder 2, allowing some outside air from the second annular gap 142 to enter the combustion cylinder 2, providing sufficient oxygen for fuel combustion, thereby promoting complete combustion, reducing the emission of incomplete combustion products and harmful gases, and achieving the goal of green environmental protection.

[0062] Specifically, the sealing body 21 is annular, and the inner diameter of the annular hole of the sealing body 21 is adapted to the outer diameter of the gas pipe 31. After assembly, the inner peripheral wall of the annular hole of the sealing body 21 is sealed with the outer peripheral wall of the gas pipe 31.

[0063] In some embodiments, an inner and outer cylinder connecting angle plate 4 is also included. One end of the inner and outer cylinder connecting angle plate 4 is detachably connected to the other end of the inner cylinder 14, and the other end of the inner and outer cylinder connecting angle plate 4 is detachably connected to the inner wall of the outer cylinder 11. The outer circumferential side of the annular vent flange 12 is detachably connected to one end of the outer cylinder 11, and the inner circumferential side of the annular vent flange 12 is detachably connected to the outer circumferential wall of the inner cylinder 14.

[0064] The outer cylinder 11, inner cylinder 14, and annular vent flange 12 are securely connected as a whole through a detachable connection between the inner and outer cylinder connecting angle plate 4 and the annular vent flange 12, ensuring coaxiality and structural strength. The detachable connection structure (such as bolt connection) greatly facilitates the installation, disassembly, and regular maintenance of internal components, effectively reducing maintenance difficulty and cost.

[0065] Specifically, an inner flange 144 is coaxially welded to the inner circumferential wall of the other end of the inner cylinder 14. One end of the inner and outer cylinder connecting angle plate 4 is detachably connected to the inner flange 144 of the inner cylinder 14 by bolts, and the other end of the inner and outer cylinder connecting angle plate 4 is detachably connected to the inner wall of the outer cylinder 11 by bolts.

[0066] In some embodiments, a heat-resistant support assembly 5 is also included. The heat-resistant support assembly 5 is disposed between the outer peripheral wall of the combustion cylinder 2 and the inner peripheral wall of the corresponding inner cylinder 14 to support the combustion cylinder 2. The heat-resistant support assembly 5 is provided with an air passage 521 in a direction parallel to the axial direction of the combustion cylinder 2.

[0067] The heat-resistant support assembly 5 firmly supports the combustion cylinder 2 inside the inner cylinder 14, ensuring that the two remain coaxial, thereby forming a second annular gap 142 of uniform width. The air passage 521 arranged axially on the support assembly ensures that the airflow in the second annular gap 142 can pass smoothly, avoiding airflow blockage caused by the support structure, and ensuring the uniformity of the heat preservation effect and the stability of the airflow.

[0068] In some embodiments, the heat-resistant support assembly 5 includes a heat-resistant arc beam 51 and a beam bracket 52; the beam bracket 52 is disposed at the bottom of the inner peripheral wall of the inner cylinder 14, the heat-resistant arc beam 51 is disposed at the top of the beam bracket 52, and the top of the heat-resistant arc beam 51 is supported on the lower part of the outer peripheral wall of the combustion cylinder 2. The lower part of the beam bracket 52 is provided with multiple air passages 521 along the axial direction parallel to the combustion cylinder 2; the multiple air passages 521 are arranged at intervals along the circumference of the combustion cylinder 2.

[0069] The heat-resistant curved beam 51 can be constructed using refractory materials in a contour-following manner, possessing excellent heat insulation performance and resistance to thermal deformation, enabling it to stably support the combustion cylinder 2 at high temperatures for extended periods. The beam bracket 52 adopts a bridge-like structural design, with multiple air passages 521 at its lower part not only ensuring uniform and smooth airflow but also further enhancing the heat insulation effect, effectively preventing localized overheating, and significantly extending the service life of the support components and the entire device.

[0070] Specifically, the overall shape of the heat-resistant arc beam 51 and the beam bracket 52 is an arc concentric with the combustion tube 2.

[0071] In some embodiments, the sealing plate 13 includes an adjusting ring plate 131 and an inspection plate 132; the adjusting ring plate 131 is adapted to be fixed at the other end of the outer cylinder 11; the inspection plate 132 is adapted to block the annular hole of the adjusting ring plate 131; multiple sets of adjusting air holes 1311 are provided on the adjusting ring plate 131 at the second annular gap 142 and the first annular gap 111; the multiple sets of adjusting air holes 1311 are evenly distributed around the sealing plate 13; a through hole 1321 is provided on the inspection plate 132 at the axis of the combustion cylinder 2; the gas pipe 31 of the burner 3 can be adapted to pass through the through hole 1321.

[0072] The split design of the sealing plate 13 clearly defines the functions of the adjusting ring plate 131 and the inspection plate 132. Multiple sets of adjusting air holes on the adjusting ring plate 131 can fine-tune the airflow entering the first annular gap 111 and the second annular gap 142, ensuring uniform airflow distribution in both layers and optimizing the insulation effect. The inspection plate 132 is detachable, and its through-hole 1321 provides an interface for the installation of the burner 3, while also facilitating direct inspection of the interior of the combustion cylinder 2 after disassembly, improving maintainability.

[0073] Specifically, each group of regulating air vents 1311 includes multiple regulating air vents. An arc-shaped cover plate (not shown in the figure) is slidably connected to the surface of the regulating ring plate 131 at each corresponding location along the circumference of the regulating ring plate 131. The arc-shaped cover plate can slide to block the corresponding regulating air vent group 1311. By adjusting the opening of the blockage (i.e., adjusting the number of regulating air vents blocked in each group of regulating air vents 1311), the air intake of the regulating air vent group 1311 can be controlled.

[0074] Specifically, the regulating air vent assembly 1311 can be four sets. Welding nuts 133 are welded and fixed on both the regulating ring plate 131 and the inspection plate 132; the welding nuts 133 on the regulating ring plate 131 are used to install the inspection plate 132 by bolts; the welding nuts 133 on the inspection plate 132 are used to install the burner 3 housing by bolts.

[0075] In some embodiments, the inspection plate 132 is provided with an observation and cooling hole 1322 corresponding to the cavity of the combustion cylinder 2.

[0076] The observation and cooling port 1322 has a dual function. On the one hand, operators can directly observe the combustion state inside the combustion chamber 2 through the observation and cooling port 1322, which facilitates timely adjustment of combustion parameters. On the other hand, the observation and cooling port 1322 allows some ambient air to flow in, which cools and dissipates heat from the end of the burner 3 and the inspection plate 132 itself, preventing overheating damage and heat loss, and improving the safety, operability and operational reliability of the equipment. Under negative pressure, the cold outside air entering through the observation and cooling port 132 is heated and can enter the mixing chamber 141 through the second annular gap 142, further improving the energy-saving effect.

[0077] In some embodiments, the mixing chamber 141 is cylindrical and coaxially arranged with the combustion chamber 2; the opening of the mixing chamber 141 near the combustion chamber 2 is the first air inlet 1411, and the opening of the mixing chamber 141 away from the combustion chamber 2 is the air outlet; multiple second air inlets 1412 are provided on the outer peripheral wall of the mixing chamber 141, and the multiple second air inlets 1412 are spaced apart and uniformly arranged along the circumference of the mixing chamber 141. The air volume regulating mechanism 6 includes a drive motor 61 and an regulating cylinder 62. The regulating cylinder 62 is coaxially rotatably sleeved on the outer peripheral wall of the mixing chamber 141. The outer peripheral wall of the regulating cylinder 62 is provided with multiple air inlet holes 621, which are spaced apart and evenly arranged along the circumference of the regulating cylinder 62. The shaft of the drive motor 61 is connected to the regulating cylinder 62 for driving the regulating cylinder 62 to rotate, thereby making the multiple air inlet holes 621 correspondingly connected or misaligned with the multiple air inlets 1412, thus adjusting the opening degree of the air inlets 1412.

[0078] The airflow regulating mechanism 6 enables precise control of the mixing temperature. The drive motor 61 rotates the regulating cylinder 62, precisely controlling the overlap area between the air inlet 621 and the air inlet 1412 on the mixing chamber 141, thereby linearly regulating the amount of outside cold air entering. Based on the target temperature required for production, the mixing ratio of hot and cold air can be adjusted in real time and precisely, effectively solving the problems of large temperature fluctuations and inaccurate control in traditional equipment, and ensuring the stability of the drying process.

[0079] Specifically, the outer peripheral wall of the mixing chamber 141 is coaxially provided with an annular groove 1414; the adjusting cylinder 62 is coaxially rotatably nested in the annular groove 1414; a ring gear is coaxially provided on the outer periphery of the adjusting cylinder 62, and a fixed drive gear is fitted on the shaft of the drive motor 61, the drive gear and the ring gear being adapted to mesh and transmit power. The drive motor 61 drives and controls the rotation of the adjusting cylinder 62 through the drive gear and the ring gear. The drive motor 61 can be mounted on the outer peripheral wall of the mixing chamber 141 by a bracket.

[0080] Specifically, the outer cylinder 11 is arranged horizontally along its axis, and an outer cylinder support 113 is provided at the bottom of the outer cylinder 11; the outer cylinder 11 is set on the ground through the outer cylinder support 113.

[0081] In some embodiments, a controller is also included, which is electrically connected to the drive motor 61 to control its rotation.

[0082] The introduction of a controller automates the control of the drive motor 61, eliminating the need for manual intervention in the entire airflow adjustment process. The controller automatically sends commands to the drive motor 61 based on preset temperature parameters or real-time temperature feedback from sensors, driving the regulating cylinder 62 to move precisely, achieving rapid response and closed-loop accurate temperature control. This significantly improves the intelligence level and temperature control efficiency of the device, meeting the development needs of modern grain drying for intelligent and stable control.

[0083] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0084] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hot air heating device, characterized in that, include: The housing (1) has a mixing cavity (141) at one end. The combustion cylinder (2) is axially disposed inside the housing (1). A second annular gap (142) and a first annular gap (111) are arranged radially from the inside to the outside between the outer periphery of the combustion cylinder (2) and the inner periphery of the housing (1). The second annular gap (142) and the first annular gap (111) are radially isolated. One end of the first annular gap (111) is connected to the external atmosphere, and the other end of the first annular gap (111) is connected to one end of the second annular gap (142). The other end of the second annular gap (142) and the outlet of the combustion cylinder (2) are both connected to the air inlet (1411) of the mixing chamber (141). A burner (3) is connected to the combustion cylinder (2) and is used to supply fuel into the combustion cylinder (2) to generate high-temperature combustion gas; Air volume regulating mechanism (6), the air volume regulating mechanism (6) is connected to and communicates with the air inlet 2 (1412) of the mixing chamber (141), and is used to regulate and control the amount of outside air entering the mixing chamber (141); The air intake of the air intake is connected to the air outlet of the mixing chamber (141) to form a negative pressure inside the mixing chamber (141) and the housing (1) so as to drive the outside air to flow through the first annular gap (111) and the second annular gap (142) in sequence and enter the mixing chamber (141), and introduce the high-temperature combustion gas generated by the combustion cylinder (2) into the mixing chamber (141) so that the high-temperature combustion gas mixes with the outside air in the mixing chamber (141).

2. The hot air heating device according to claim 1, characterized in that, The shell (1) includes an outer cylinder (11), an annular vent flange (12), a sealing plate (13), and an inner cylinder (14). The annular vent flange (12) is coaxial and adapted to be connected to one end of the outer cylinder (11), and the sealing plate (13) is adapted to cover the other end of the outer cylinder (11); the inner cylinder (14) is coaxially disposed inside the outer cylinder (11), and one end of the inner cylinder (14) is adapted to pass through the annular hole of the annular vent flange (12) and extend to the outside of the outer cylinder (11) to form a mixing cavity (141); the inner cylinder (14) and the sealing plate (13) are spaced apart along the axial direction; a first annular gap (111) is formed between the inner peripheral wall of the outer cylinder (11) and the corresponding outer peripheral wall of the inner cylinder (14); the annular vent flange (12) is provided with an air inlet mesh that connects the first annular gap (111) with the outside air; The combustion cylinder (2) is coaxially disposed inside the outer cylinder (11) and the inner cylinder (14); a second annular gap (142) is formed between the outer peripheral wall of the combustion cylinder (2) and the corresponding inner peripheral wall of the inner cylinder (14); a sealing body (21) is adapted to seal the end of the combustion cylinder (2) away from the mixing chamber (141). The burner (3) is located outside the housing (1) and its gas pipe (31) passes through the sealing plate (13) and the enclosure (21) in sequence and extends into the cavity of the combustion cylinder (2).

3. The hot air heating device according to claim 2, characterized in that, The enclosure (21) is a heat-insulating enclosure; the outer peripheral wall of the combustion cylinder (2) is provided with oxygen-enriching through holes (22).

4. The hot air heating device according to claim 2, characterized in that, It also includes an inner and outer cylinder connecting angle plate (4), one end of which is detachably connected to the other end of the inner cylinder (14), and the other end of which is detachably connected to the inner wall of the outer cylinder (11); The outer circumferential side of the annular vent flange (12) is detachably connected to one end of the outer cylinder (11), and the inner circumferential side of the annular vent flange (12) is detachably connected to the outer circumferential wall of the inner cylinder (14).

5. The hot air heating device according to claim 2, characterized in that, It also includes a heat-resistant support assembly (5), which is disposed between the outer peripheral wall of the combustion cylinder (2) and the inner peripheral wall of the corresponding inner cylinder (14) to support the combustion cylinder (2). The heat-resistant support assembly (5) is provided with an air passage (521) in a direction parallel to the axial direction of the combustion cylinder (2).

6. The hot air heating device according to claim 5, characterized in that, The heat-resistant support assembly (5) includes a heat-resistant arc beam (51) and a beam bracket (52); the beam bracket (52) is located at the bottom of the inner wall of the inner cylinder (14), the heat-resistant arc beam (51) is located at the top of the beam bracket (52), and the top of the heat-resistant arc beam (51) is supported on the lower part of the outer wall of the combustion cylinder (2); The lower part of the beam bracket (52) is provided with multiple air passages (521) in a direction parallel to the axial direction of the combustion cylinder (2); the multiple air passages (521) are arranged at intervals along the circumference of the combustion cylinder (2).

7. The hot air heating device according to claim 2, characterized in that, The sealing plate (13) includes an adjusting ring plate (131) and an inspection plate (132); the adjusting ring plate (131) is adapted to be fixed at the other end of the outer cylinder (11); the inspection plate (132) is adapted to block the annular hole of the adjusting ring plate (131); multiple sets of adjusting air holes (1311) are provided on the adjusting ring plate (131) corresponding to the second annular gap (142) and the first annular gap (111); the multiple sets of adjusting air holes (1311) are evenly distributed around the sealing plate (13); a through hole (1321) is opened on the inspection plate (132) corresponding to the axis of the combustion cylinder (2); the gas pipe (31) of the burner (3) can be adapted to pass through the through hole (1321).

8. The hot air heating device according to claim 7, characterized in that, The inspection plate (132) is provided with an observation and cooling hole (1322) corresponding to the cavity of the combustion cylinder (2).

9. A hot air heating device according to claim 1, characterized in that, The mixing chamber (141) is cylindrical and coaxially arranged with the combustion chamber (2); the opening of the mixing chamber (141) near the combustion chamber (2) is the first air inlet (1411), and the opening of the mixing chamber (141) away from the combustion chamber (2) is the air outlet; multiple second air inlets (1412) are arranged on the outer peripheral wall of the mixing chamber (141), and the multiple second air inlets (1412) are spaced apart and evenly arranged along the circumference of the mixing chamber (141); The air volume adjustment mechanism (6) includes a drive motor (61) and an adjustment cylinder (62); the adjustment cylinder (62) is coaxially rotatably sleeved on the outer peripheral wall of the mixing chamber (141), and the outer peripheral wall of the adjustment cylinder (62) is provided with a plurality of air inlet holes (621), which are spaced apart and evenly arranged along the circumference of the adjustment cylinder (62); the shaft of the drive motor (61) is connected to the adjustment cylinder (62) for driving the adjustment cylinder (62) to rotate, thereby making the plurality of air inlet holes (621) corresponding to or misaligned with the plurality of air inlets (1412), thereby adjusting the opening degree of the air inlets (1412).

10. A hot air heating device according to claim 9, characterized in that, It also includes a controller electrically connected to the drive motor (61) to control its rotation.

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