Magnetic coupling soot cleaning device for a burner

Abstract

This invention relates to the field of burner technology for flame-driven weeding agricultural machinery, and discloses a magnetically coupled carbon deposit removal device for burners. The device includes a combustion chamber with a hollow annular cavity. A scraper for scraping carbon deposits from the side walls is rotatably mounted within the annular cavity. An inner coupler is located at the top of the scraper, and an outer coupler is rotatably mounted on the outer circumferential side wall of the combustion chamber. The inner and outer couplers are magnetically coupled and rotate synchronously. This invention utilizes the waste heat of the combustion chamber itself to preheat liquid fuel, resulting in energy efficiency. Employing a magnetically coupled non-contact drive, it continuously scrapes away carbon deposits generated during fuel preheating while ensuring the airtightness of the annular cavity, preventing carbon deposits from clogging fuel lines and effectively improving combustion stability and energy efficiency. It is suitable for use with burners in flame-driven weeding equipment.

Description

Technical Field

[0001] This invention relates to the field of agricultural weeding machinery technology, particularly to the field of flame weeding agricultural machinery technology, especially to the field of burner technology for flame weeding machinery, and specifically to a magnetically coupled carbon deposit removal device for burners. Background Technology

[0002] Flame weeding is a physical weeding method that uses high-temperature flames to burn weeds, thereby achieving weed control, sterilization, and pest control. It can effectively replace chemical pest control methods such as herbicides and insecticides, reducing environmental and agricultural product safety issues caused by pesticide residues, and is widely used in agricultural production.

[0003] Existing flame weed cutters mostly use liquid fuels such as methanol and pure hydrocarbons. Due to the limitations of the open combustion chamber structure, the liquid fuel is difficult to burn completely after being directly injected into the combustion chamber. Some unburned fuel is carried out of the combustion chamber by the high-speed airflow, resulting in high energy consumption and low combustion efficiency. To improve combustion efficiency, the industry has gradually adopted fuel preheating solutions. Among them, the most energy-efficient method is to use the heat of the combustion chamber itself for heat exchange preheating. However, in this solution, the fuel must flow through a preheating channel adjacent to the high-temperature combustion chamber. The high temperature of hundreds to thousands of degrees Celsius can easily cause carbon deposition or cracking of the fuel, and carbon deposits will continuously adhere to the inner wall of the preheating channel.

[0004] As usage time increases, the carbon deposits will thicken, causing the preheating channel to narrow and fuel supply to be insufficient. In severe cases, it may even cause pipeline blockage, resulting in the burner failing to work properly. Summary of the Invention

[0005] Existing flame weed killers use a burner mounted on the machine to spray high-temperature flames that burn weeds, achieving weed control, sterilization, and pest control. This replaces existing chemical pest control methods such as herbicides and pesticides, reducing the harm caused by chemical pesticide residues. Current flame weed killers typically use liquid fuels, such as methanol, ethanol, or other pure hydrocarbon fuels. Different fuels have different burner designs, but regardless of the fuel used, the burner's physical structure is non-sealed. This design is primarily for the directness of the flame spray and the safety of the low-pressure combustion chamber. However, this open combustion chamber design also has drawbacks, namely high energy consumption. Liquid fuel injected directly into the combustion chamber is difficult to burn completely, causing some fuel to be carried out of the combustion chamber with the high-speed flame jet before it has a chance to burn fully, thus increasing energy consumption. To address this issue, a fuel preheating device is typically designed. Various preheating device options exist, including standalone electric preheating, preheating via a circulating condensation structure, and preheating through heat exchange within the combustion chamber itself. The latter is arguably the most energy-efficient. However, this most efficient and energy-saving method, relying on combustion chamber heat exchange, inevitably leads to carbon deposition on the inner wall of the preheating channel due to the high temperature within the combustion chamber. Over time, this accumulation results in insufficient fuel supply, blockages, and other problems, and this approach is rarely used in existing technologies. To achieve higher energy efficiency and better energy-saving performance, and to address the carbon deposition problem during fuel preheating, this application provides a magnetically coupled carbon deposit removal device for burners. This device removes carbon deposits generated during fuel preheating, preventing insufficient fuel supply or even fuel line blockages that hinder normal combustion caused by excessive carbon buildup.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: A magnetically coupled carbon deposit removal device for burners includes a combustion chamber with a hollow annular cavity. A scraper for scraping carbon deposits adhering to the side walls of the annular cavity is rotatably mounted within the cavity. An inner coupler is mounted on the top of the scraper, and an outer coupler is rotatably mounted on the outer circumferential side wall of the combustion chamber. The inner and outer couplers are magnetically coupled and rotate synchronously with the outer coupler. This invention utilizes the heat dissipated during combustion to preheat room-temperature liquid fuel. The annular cavity for fuel preheating is directly positioned on the outer wall of the high-temperature combustion zone of the combustion chamber. The high temperature generated during combustion eliminates the need for an additional energy-consuming preheating device, resulting in greater energy efficiency and a simpler structure. Because a large amount of heat is transferred to the room-temperature liquid fuel during combustion, the liquid fuel has a higher initial temperature before entering the combustion chamber, or even becomes gaseous. This significantly increases the combustion efficiency compared to directly injecting room-temperature liquid fuel into the combustion chamber. The high-temperature environment of the combustion chamber, while beneficial for fuel preheating, also makes liquid fuel prone to carbon buildup due to temperatures reaching hundreds or even thousands of degrees Celsius. Different fuels have different carbon buildup rates, and fuels that are less prone to carbon buildup and have higher safety, such as methanol, are preferred. Methanol molecules contain an oxygen atom, essentially acting as an "internal oxidant." Under ideal pyrolysis conditions, it tends to decompose directly into carbon monoxide and hydrogen, rather than elemental carbon. However, even when methanol is used as fuel, actual experiments have shown that carbon buildup still occurs, especially when the combustion chamber is made of carbon steel or stainless steel. To address this issue, this invention uses a rotatable scraper installed within the annular cavity to continuously scrape away the newly formed carbon layer, maintaining the cleanliness of the annular cavity's inner sidewalls. Since the cutter is installed inside the annular space, which is a cavity for fuel preheating, the internal pressure continuously increases as preheating progresses. Therefore, conventional drive structures cannot simultaneously meet the airtightness requirements of the annular cavity. To overcome this technical problem, this invention employs a magnetic coupling structure to drive the cutter inside the annular cavity. An external drive source, such as a motor, drives the external coupler to rotate around the circumference outside the combustion chamber. The magnetic coupling of the external coupler drives the internal coupler to rotate synchronously, thereby enabling the cutter to continuously scrape away the carbon deposits generated on both sides of the annular cavity, achieving the technical effect of removing carbon deposits. It is worth noting that the annular cavity structure of the combustion chamber described in this invention is both the main structure of the combustion chamber and the annular cavity constituting fuel preheating. The central region is the combustion space. How combustion occurs in this space and its internal structure are irrelevant to the carbon removal structure of this invention; therefore, other structures of the combustion chamber will not be described in detail here.The key point worth noting is that it provides a carbon deposit removal device in which the auger rotates during operation. However, the auger drive source is not necessary for this invention; it can be driven by existing mechanisms such as motors mounted on this invention.

[0007] To improve the effectiveness and stability of carbon deposit scraping, preferably, the auger comprises an inner coupler and an auger cage fixedly connected from top to bottom. The inner and outer circumferential sidewalls of the auger cage are equipped with helical scrapers. The helical structure serves two purposes: first, it extends the length of the scrapers per unit axial length on both sides of the annular cavity, improving scraping efficiency; second, it provides a helical channel for fuel preheating flow, resulting in a longer flow path and more thorough preheating of the fuel within the annular cavity. Simultaneously, to further reduce the resistance of the magnetic coupling drive, at least three mounting holes are arranged in a circumferential array on the top end face of the inner coupler and / or the circumferential sidewalls of the auger cage. A ball bearing mechanism for reducing friction is detachably installed within these mounting holes. The essential purpose of the ball bearing mechanism is to change the original sliding friction into rolling friction between mechanical structures, and with a smaller contact area, thus significantly reducing frictional resistance. The ball bearing mechanism can use existing high-temperature resistant elastic plunger balls, which not only meet the requirements of rolling friction but also achieve adjustable contact pressure and reset, perfectly compatible with the working conditions of this invention. At the same time, it is particularly important to emphasize that, due to the innovative use of a spiral structure scraper in this invention, as the fuel flows from the top to the bottom of the cutter during preheating, the pressure increases. This causes the scraper protruding from the auger to be subjected to an axial upward force, so the bottom of the cutter does not physically contact or rub against the bottom of the annular cavity. Therefore, the inner coupler located at the top is mainly subjected to the greatest force. By installing multiple ball bearing mechanisms on the top end face of the inner coupler, the magnetic coupling resistance can be significantly reduced, making it easier for the cutter to rotate with the outer coupler.

[0008] To balance the pressure on both sides of the auger, the combustion chamber preferably includes an inner cylinder and an outer cylinder arranged coaxially. The bottoms of the inner and outer cylinders are fixedly connected to form a pressure equalization chamber for fuel flow. The pressure equalization chamber is connected to an injection pipe for supplying preheated fuel to the combustion chamber within the combustion chamber. The annular cavity formed by the inner and outer cylinders is physically divided by the auger into an outer preheating chamber and an inner preheating chamber. Since the inner preheating chamber is closer to the combustion chamber, its temperature is significantly higher than that of the outer preheating chamber. Therefore, the preheating temperature and degree of vaporization of fuel located at different positions are not consistent when it reaches the pressure equalization chamber after passing through the annular cavity, which may cause instability in the injection rate at the fuel supply terminal. To solve this problem, the fuel from both the inner and outer paths is mixed in the pressure equalization chamber and then uniformly fed into the injection pipe, and finally injected into the combustion chamber through a nozzle connected to the injection pipe, achieving the technical effect of high-efficiency combustion. The annular opening formed at the top of the annular cavity of the combustion chamber is sealed by a fixedly installed distribution ring, and the distribution ring is connected to a fuel pipe for the flow of fuel at room temperature. Fuel at room temperature enters the distribution ring through the fuel pipe. The distribution ring supplies fuel along the circumference of the distribution ring. The fuel continuously enters the outer preheating chamber and the inner preheating chamber through the inner coupler, and preheating is completed through heat exchange.

[0009] To further improve the carbon deposit removal effect, preferably, the lower end of the inner coupler is also coaxially fixedly connected to a auger. The auger is integrally provided with a spiral scraper. The scraper extends towards the inner cylinder and the outer cylinder respectively to form an inner convex ridge and an outer convex ridge for scraping off the carbon deposits attached to the inner cylinder and the outer cylinder. The gap K1 between the inner convex ridge and the inner cylinder and the gap K2 between the outer convex ridge and the outer cylinder satisfy: 1.5mm > K1 + K2 > 0.1mm. Because the entire auger is rotatably mounted within the annular cavity without being secured by a bearing structure, it reciprocates within a small radial range, such as 1.5mm. Therefore, during carbon removal, the contact points between the scraper and the inner and / or outer cylinders are random. Essentially, the auger as a whole is floating and rotating within the annular cavity, rather than being strictly coaxially mounted with the combustion chamber. This floating mounting technique reduces assembly difficulty and avoids uncontrollable gaps between the scraper and the inner and outer cylinders. If the auger cannot float, excessive gaps will lead to increased unremovable carbon buildup, while insufficient gaps may cause the auger to jam, resulting in rotational difficulties. The floating rotation method perfectly solves this problem, and testing has shown it to be highly effective.

[0010] To further optimize the magnetic coupling structure, preferably, the inner coupler includes a magnetic ring support, on which through holes for fuel passage and blind holes for mounting inner permanent magnets are arranged in a circumferential array at intervals; the outer coupler includes a magnetically conductive shield, on which multiple outer permanent magnets are fixedly mounted in a circumferential array, wherein any one of the inner permanent magnets and the outer permanent magnets are mounted facing each other and their magnetic poles on opposite sides are opposite.

[0011] To further reduce the rotational resistance of the external coupler, the mechanical structure is simplified. Preferably, the external coupler includes a gear ring, a magnetic shielding component coaxially fixed on the gear ring, a plurality of external permanent magnets arranged in a circumferential array on the inner sidewall of the magnetic shielding component, and a plurality of threaded holes arranged in a circumferential array on the magnetic shielding component. Each threaded hole is located between two adjacent external permanent magnets, and a ball bearing mechanism for reducing the frictional resistance between the external coupler and the outer sidewall of the combustion chamber is installed in the threaded hole.

[0012] To better achieve magnetic coupling drive, preferably, the present invention also includes a drive mechanism for driving the external coupler. The drive mechanism includes a mounting bracket, a motor mounted on the mounting bracket, and a pinion gear mounted on the output shaft of the motor. The pinion gear meshes with a gear ring coaxially arranged with the external coupler to drive the external coupler to rotate along the combustion chamber axis.

[0013] As another structural scheme for rotatably connecting the external coupler, preferably, the external coupler extends downward from the circumferential sidewall near the combustion chamber to form a bearing seat, and a bearing fixedly sleeved on the outer circumferential sidewall of the combustion chamber is installed in the bearing seat, so that the external coupler can rotate relative to the combustion chamber.

[0014] To further reduce frictional resistance, preferably, the annular opening formed at the top of the annular cavity of the combustion chamber is sealed by a fixedly installed distribution ring, and the distribution ring is provided with an annular end face near the auger for abutting against the ball bearing mechanism to reduce friction.

[0015] To enhance the carbon deposit removal effect, preferably, the scraper is a single spiral or a multi-spiral structure arranged in parallel. The multi-spiral structure is a multi-head spiral structure with equal lead. Beneficial effects

[0016] 1. This invention employs an integrated structure that uses the waste heat of the combustion chamber itself to preheat liquid fuel. Combined with a magnetically coupled non-contact driven auger, it achieves online scraping of carbon deposits without the need for an additional independent preheating device, significantly improving energy utilization efficiency. At the same time, the magnetic coupling drive eliminates the need for a dynamic sealing structure in the preheating chamber, ensuring the airtightness of the annular cavity. This fundamentally solves the problems of carbon accumulation and pipeline blockage during the high-temperature fuel preheating process, improving the stability and reliability of burner operation.

[0017] 2. This invention employs a auger structure with a spiral scraper. The spiral scraper extends the carbon removal path per unit axial length, improving the scraping coverage and removal efficiency, and can promptly remove newly formed thin layers of carbon deposits, preventing carbon deposits from thickening and hardening. On the other hand, it can guide the fuel to form a spiral flow path within the annular cavity, extending the residence time of the fuel in the preheating chamber, enhancing the heat exchange effect, improving the uniformity of fuel preheating and the degree of gasification, and further improving combustion efficiency.

[0018] 3. This invention adopts a floating rotating installation scheme for the auger. The auger does not need to be strictly coaxially fixed by bearings or other structures. It can float radially within a small range, which reduces the precision requirements for parts processing and assembly, controls production costs, and allows the scraper to adaptively fit the two side walls of the annular cavity, ensuring the thorough removal of carbon deposits. At the same time, it can avoid the scraper jamming problem caused by coaxiality error, and improve the adaptability and stability of the device operation.

[0019] 4. The inner and outer permanent magnets of this invention are arranged with alternating N and S magnetic poles, and each pair of inner and outer permanent magnets adopts a magnetic coupling transmission structure with one-to-one facing arrangement. The transmission torque is large, the synchronization is good, the non-contact transmission has no mechanical wear, and the service life of the device is long. At the same time, a ball bearing mechanism is set at both the auger and the outer coupler to convert sliding friction into rolling friction, which significantly reduces rotational resistance and drive load, improves power transmission efficiency, and the ball bearing mechanism adopts a detachable installation method, which is convenient for later maintenance and replacement.

[0020] 5. The present invention adopts a combination structure of uniform feeding by the distribution ring and mixing and stabilizing by the pressure equalization chamber. The distribution ring can achieve sealing of the top of the annular cavity and uniform feeding of fuel around the circumference, ensuring that the fuel flow rate is consistent throughout the preheating chamber. The pressure equalization chamber can mix and stabilize the preheated fuel on both the inner and outer sides, balancing the temperature and pressure differences of fuel in different areas, so that the fuel state entering the injection pipe is stable, ensuring the consistency and stability of burner injection and combustion. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an isometric view of the structure of the present invention.

[0023] Figure 2 This is the front view of the present invention.

[0024] Figure 3 It is along Figure 2 A sectional view of the section symbol AA.

[0025] Figure 4 yes Figure 3 Enlarged view of a portion of area D in the middle.

[0026] Figure 5 It is along Figure 2 A sectional view of the section symbol BB.

[0027] Figure 6 It is along Figure 2 A sectional view of the section symbol CC.

[0028] Figure 7 This is an isometric view of the auger's structure.

[0029] Figure 8 yes Figure 7 Another visual structural axonometric drawing.

[0030] In the diagram: 1-Motor; 2-Pinary gear; 3-Burner; 4-External coupler; 41-Gear ring; 42-Magnetic shield; 43-External permanent magnet; 44-Threaded hole; 5-Combustion chamber; 51-Inner cylinder; 52-Outer cylinder; 53-Pressure equalization chamber; 54-External preheating chamber; 55-Inner preheating chamber; 6-Auger; 61-Inner coupler; 611-Mounting hole; 612-Through hole; 613-Inner permanent magnet; 62-Auger cage; 63-Scraper; 64-Notch; 7-Distribution ring; 8-Fuel pipe; 9-Injection pipe; 10-Nozzle. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for 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 application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0036] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] Example 1: As Figures 1-3 As shown, this embodiment provides a magnetically coupled carbon deposit removal device for a burner, including a combustion chamber 5. The combustion chamber 5 has a hollow annular cavity. A scraper 6 for scraping carbon deposits adhering to the two side walls of the annular cavity is rotatably installed inside the annular cavity. An inner coupler 61 is installed on the top of the scraper 6. An outer coupler 4 is rotatably installed on the outer circumferential side wall of the combustion chamber 5. The inner coupler 61 is magnetically coupled to the outer coupler 4 and rotates synchronously with the outer coupler 4.

[0038] Working principle: Room temperature liquid fuel is transported from fuel pipe 8 to the annular cavity of combustion chamber 5. The high temperature heat generated by combustion inside combustion chamber 5 is transferred to the annular cavity through the wall. During the flow of fuel in the annular cavity, heat exchange occurs with the cavity wall, achieving preheating and temperature rise. Some fuel can be vaporized into a gaseous state. The preheated fuel is finally transported into the combustion chamber 5 through injection pipe 9 and sprayed out through nozzle 10 to participate in combustion. When the fuel flows in the high temperature annular cavity, carbon deposition or cracking reactions occur due to the high temperature environment. The generated elemental carbon will continuously adhere to the inner walls on both sides of the annular cavity, forming a carbon deposit layer.

[0039] An external power unit drives the external coupler 4 to rotate circumferentially around the axis of the combustion chamber 5. The external coupler 4 and the internal coupler 61 are coupled and transmitted non-contactly via magnetic force, causing the internal coupler 61 to rotate synchronously with the external coupler 4, thereby driving the cutter 6 to rotate continuously within the annular cavity. During the rotation of the cutter 6, its outer edge structure continuously contacts the two side walls of the annular cavity, scraping off newly formed carbon deposits on the walls. The scraped-off carbon deposits are carried away with the fuel flow, preventing the continuous accumulation and thickening of carbon deposits.

[0040] This embodiment utilizes the residual heat from combustion in the combustion chamber 5 to preheat the fuel, eliminating the need for an additional independent preheating device. It features a compact structure and high energy efficiency. The magnetic coupling non-contact transmission scheme eliminates the need for power input to penetrate the wall of the annular cavity and eliminates the need for dynamic sealing structures to drive the auger 6 within the cavity. This ensures the airtightness of the annular cavity and enables continuous online removal of carbon deposits, thus solving the carbon buildup and blockage problem during fuel preheating at its source.

[0041] Example 2: As Figures 1-4 , Figures 7-8 As shown, this embodiment further optimizes the structure of the auger 6 based on embodiment 1. The auger 6 includes an inner coupler 61 and an auger cage 62 that are fixedly connected from top to bottom. The inner and outer circumferential sidewalls of the auger cage 62 are provided with spiral scrapers 63. At least three mounting holes 611 are distributed in a circumferential array on the top end face of the inner coupler 61 and / or the circumferential sidewall of the auger cage 62. A ball bearing mechanism for reducing friction can be detachably installed in the mounting holes 611.

[0042] Working principle: When the cutter 6 rotates, the scraper 63 on the inner side of the auger 62 corresponds to the inner wall of the annular cavity, and the scraper 63 on the outer side corresponds to the outer wall of the annular cavity. Of course, this is just a description for ease of understanding; for details, please refer to [link to relevant documentation]. Figures 3-4 As shown, the inner and outer scrapers 63 are actually a single-piece structure. As the auger 62 rotates, the spiral scraper 63 gradually scrapes away the carbon deposits on the wall surface along the axial direction. The spiral scraper 63 extends the scraping path per unit axial length, increasing the coverage and frequency of carbon deposit removal. It can promptly remove newly formed thin layers of carbon deposits, preventing them from hardening and becoming difficult to scrape off. At the same time, the spiral scraper 63 forms a spiral flow channel within the annular cavity, guiding the fuel to flow downwards along the spiral path, extending the residence time of the fuel within the annular cavity, allowing for sufficient heat exchange between the fuel and the cavity wall, and improving the preheating effect and fuel gasification rate.

[0043] The ball bearing mechanism within the mounting hole 611 protrudes from the end face of the mounting hole 611 and abuts against the adjacent fixed component. This converts the sliding friction between the cutter 6 and the fixed component into rolling friction of the balls, significantly reducing the frictional resistance during the rotation of the cutter 6, decreasing the load on the magnetic coupling drive, and improving the smoothness of the cutter 6's rotation. The ball bearing mechanism is detachably mounted within the mounting hole 611; when the balls wear out, they can be individually removed and replaced without replacing the entire cutter 6, thus reducing maintenance costs.

[0044] In this embodiment, the spiral scraper 63 has the dual functions of carbon scraping and fuel diversion, which improves the efficiency of carbon removal and enhances the fuel preheating effect; the ball bearing mechanism effectively reduces rotational friction resistance, improves transmission efficiency and running stability, and the detachable structure facilitates later maintenance and reduces operation and maintenance costs.

[0045] Example 3: As Figures 1-3 , Figures 5-6 As shown, this embodiment refines the structure of the combustion chamber 5 based on embodiment 1. The combustion chamber 5 includes an inner cylinder 51 and an outer cylinder 52 arranged coaxially. The bottoms of the inner cylinder 51 and the outer cylinder 52 are fixedly connected to form a pressure equalization chamber 53 for fuel flow. The pressure equalization chamber 53 is connected to an injection pipe 9 for supplying preheated fuel to the combustion chamber of the combustion chamber 5. The annular opening formed at the top of the annular cavity of the combustion chamber 5 is sealed by a fixedly installed distribution ring 7, and the distribution ring 7 is connected to a fuel pipe 8 for the flow of room temperature fuel.

[0046] Working principle: The inner cylinder 51 and outer cylinder 52 are coaxially nested, and the annular space between them forms an annular cavity for fuel preheating. The inner side of the inner cylinder 51 is the combustion zone of the combustion chamber 5. The high temperature generated by combustion is transferred to the fuel in the annular cavity through the walls of the inner cylinder 51 and outer cylinder 52, achieving heat exchange preheating. Room temperature liquid fuel is transported to the distribution ring 7 through the fuel pipe 8. The distribution ring 7 evenly distributes the fuel into the top of the annular cavity along the circumferential direction, ensuring that the fuel flow rate is consistent throughout the annular cavity and avoiding insufficient preheating due to excessively high local fuel flow rates. Of course, since the cutter 6 rotates, even if the distribution ring 7 cannot distribute the fuel to all parts of the circumference in time, the rotation of the cutter 6 can still evenly guide the fuel into the annular cavity.

[0047] After being preheated, the fuel flows downwards along the annular cavity and then into the pressure equalization chamber 53 at the bottom. Fuel from different areas of the annular cavity mixes thoroughly in the pressure equalization chamber 53, balancing the temperature and pressure differences between different locations and ensuring a uniform and stable fuel state. The mixed and pressure-stabilized fuel is then delivered to the nozzle 10 through the injection pipe 9 and finally injected into the combustion chamber 5 for combustion. Simultaneously, the distribution ring 7 seals the top opening of the annular cavity, working in conjunction with the bottom sealing structure to form a completely sealed fuel channel, preventing fuel leakage and ensuring stable internal pressure.

[0048] In this embodiment, an annular preheating cavity is formed by a coaxially nested inner cylinder 51 and an outer cylinder 52, which has a high degree of fit with the combustion area of ​​the combustion chamber 5 and good heat transfer efficiency. The distribution ring 7 has both sealing and dispersing functions to ensure uniformity of fuel feeding and cavity sealing. The pressure equalization cavity 53 can balance the temperature and pressure of the fuel, so that the output fuel state is stable and effectively improves the stability of burner injection and combustion.

[0049] Example 4: Figures 1-8 As shown, this embodiment further optimizes the scraper 63 and the installation structure based on embodiments 1-3. The lower end of the inner coupler 61 is also coaxially fixedly connected to the auger 62. The auger 62 is integrally provided with a spiral scraper 63. The scraper 63 extends towards the inner cylinder 51 and the outer cylinder 52 respectively to form inner and outer protrusions for scraping off the carbon deposits attached to the inner cylinder 51 and the outer cylinder 52. The gap K1 between the inner protrusion and the inner cylinder 51 and the gap K2 between the outer protrusion and the outer cylinder 52 satisfy: 1.5mm > K1 + K2 > 0.1mm.

[0050] Working principle: The auger 6 is floated and installed within the annular cavity formed by the inner cylinder 51 and the outer cylinder 52. It is not radially positioned by rigid structures such as bearings, allowing the auger 6 to float and shift within a small radial range. During rotation, the inner convex edge of the scraper 63 faces the outer wall of the inner cylinder 51, and the outer convex edge faces the inner wall of the outer cylinder 52. As the auger 6 floats and rotates, the inner and outer convex edges adaptively conform to the corresponding wall surfaces, scraping away the carbon deposits layer by layer.

[0051] By controlling the sum of the gap K1 between the inner convex rib and the inner cylinder 51 and the gap K2 between the outer convex rib and the outer cylinder 52 within the range of 0-1.5mm, the auger 6 can rotate smoothly within the annular cavity without jamming due to machining tolerances or thermal expansion and contraction. This also limits the maximum thickness of carbon residue, ensuring thorough carbon removal and preventing thick layers of carbon residue caused by excessively large gaps. The floating installation method eliminates the need for high-precision coaxial machining of the auger 6 and the combustion chamber 5, allowing for a certain range of machining tolerances. This significantly reduces the machining difficulty and assembly requirements of parts, improves production efficiency, and lowers manufacturing costs.

[0052] This embodiment adopts a floating auger 6 installation scheme, which takes into account both smooth rotation and thorough removal of carbon deposits, effectively reduces the requirements for machining and assembly precision, improves the process adaptability and operational reliability of the device, can adaptively compensate for machining tolerances and thermal deformation, and avoids the scraper 63 from jamming.

[0053] Example 5: Figures 1-5As shown, this embodiment refines the specific structure of the magnetic coupling based on Embodiment 1. The inner coupler 61 includes a magnetic ring support, on which through holes 612 for fuel passage and blind holes for mounting inner permanent magnets 613 are arranged in a circumferential array. The outer coupler 4 includes a magnetically conductive shield 42, on which multiple outer permanent magnets 43 are fixedly mounted in a circumferential array. Any inner permanent magnet 613 and an outer permanent magnet 43 are mounted facing each other with opposite magnetic poles on opposite sides. The purpose of the magnetically conductive shield 42 is to better constrain the magnetic field lines and prevent excessive dispersion of the magnetic field lines, which would reduce the torque of the magnetic coupling. In this embodiment, the magnetically conductive shield 42 is made of 45# carbon steel. Of course, those skilled in the art can use other magnetically conductive materials to pursue better technical effects. Those skilled in the art have an incentive to seek any magnetically conductive material that can effectively constrain the magnetic field lines in order to enhance the magnetic coupling effect by constraining the magnetic field lines and thus enhance the torque. Furthermore, the external coupler 4 includes a gear ring 41, a magnetic shield 42 coaxially fixed on the gear ring 41, a plurality of external permanent magnets 43 arranged in a circumferential array on the inner sidewall of the magnetic shield 42, and a plurality of threaded holes 44 arranged in a circumferential array on the magnetic shield 42. Each threaded hole is located between two adjacent external permanent magnets 43, and a ball bearing mechanism for reducing the frictional resistance between the external coupler 4 and the outer sidewall of the combustion chamber 5 is installed in the threaded hole 44.

[0054] Working principle: The inner permanent magnet 613 is embedded in the blind hole of the magnetic ring bracket of the inner coupler 61, and the outer permanent magnet 43 is fixed on the inner wall of the magnetic shield 42. The inner permanent magnet 613 and the outer permanent magnet 43 are arranged radially opposite each other, and the torque is transmitted between them through the attraction or repulsion of the magnetic poles. When the outer coupler 4 rotates, the outer permanent magnet 43 rotates synchronously, and the inner permanent magnet 613 is pulled by the magnetic force to drive the inner coupler 61 to rotate synchronously, realizing the contactless transmission of power from the outside of the combustion chamber 5 to the inner annular cavity. There is no need to set a drive shaft through the wall, and the leakage risk caused by dynamic seals is completely avoided. The through holes 612 spaced on the magnetic ring bracket allow fuel to pass through smoothly, ensuring that the channel for fuel to flow downward from the top of the annular cavity is unobstructed, without affecting the normal delivery and preheating of fuel.

[0055] The external coupler 4 receives external driving power through the gear ring 41. The gear ring 41 is coaxially and fixedly connected to the magnetic shield 42 to ensure transmission synchronization. The threaded hole 44 on the magnetic shield 42 is located between adjacent external permanent magnets 43 to avoid interference with the magnetic field of the permanent magnets. The inner side of the ball bearing mechanism installed in the threaded hole 44 abuts against the outer wall of the combustion chamber 5, converting the sliding friction between the external coupler 4 and the combustion chamber 5 into rolling friction, which greatly reduces the rotational resistance of the external coupler 4, reduces driving power consumption, and at the same time reduces component wear and extends the service life of the device.

[0056] This embodiment adopts a magnetic coupling structure with permanent magnets arranged in a one-to-one configuration, which has a large transmission torque, high synchronization accuracy, non-contact transmission with no mechanical wear, and long service life. The external ball bearing mechanism effectively reduces the rotational resistance of the external coupler 4, improves transmission efficiency, and avoids the permanent magnets in its installation position, so it will not interfere with the magnetic field transmission. The structure design is reasonable.

[0057] Example 6: As Figures 1-8 As shown, this embodiment provides an optimized scheme for the drive and auxiliary structure based on embodiment 1. The device also includes a drive mechanism for driving the external coupler 4. The drive mechanism includes a mounting bracket, a motor 1 mounted on the mounting bracket, and a pinion 2 mounted on the output shaft of the motor 1. The pinion 2 meshes with a gear ring 41 coaxially arranged with the external coupler 4 to drive the external coupler 4 to rotate along the axis of the combustion chamber 5.

[0058] In this embodiment, the external coupler 4 extends downward from the circumferential sidewall of the combustion chamber 5 to form a bearing seat. A bearing fixedly sleeved on the outer circumferential sidewall of the combustion chamber 5 is installed in the bearing seat, so that the external coupler 4 can rotate relative to the combustion chamber 5.

[0059] In this embodiment, the annular opening formed at the top of the annular cavity of the combustion chamber 5 is sealed by a fixedly installed distribution ring 7. The distribution ring 7 has an annular end face near the auger 6 for contacting the ball bearing mechanism to reduce friction. In this embodiment, the scraper 63 has a single spiral or a multi-spiral structure arranged in parallel with each other.

[0060] Working principle: The motor 1 is fixedly mounted on the mounting bracket. After starting, the output shaft drives the pinion 2 to rotate. The pinion 2 meshes with the gear ring 41 to transmit power to the external coupler 4, driving the external coupler 4 to rotate circumferentially around the axis of the combustion chamber 5. The gear transmission structure has high transmission accuracy and stable operation. The speed of the external coupler 4 and the cutter 6 can be precisely adjusted by controlling the speed of the motor 1 to adapt to the carbon deposition rate of different fuels.

[0061] The external coupler 4 rotates with the outer wall of the combustion chamber 5 through the bearing in the bearing housing. The bearing can provide radial positioning and axial support for the external coupler 4, ensuring the coaxiality of the rotation of the external coupler 4, avoiding radial wobble during rotation, ensuring the alignment accuracy of the outer permanent magnet 43 and the inner permanent magnet 613, and maintaining the stability of the magnetic coupling transmission.

[0062] The inner annular end face of the distribution ring 7 is flat and smooth, and it abuts against the ball bearing mechanism at the top of the auger 6 to provide axial support for the auger 6 and restrict the axial movement of the auger 6. At the same time, the ball bearing mechanism converts the axial sliding friction into rolling friction, reduces the axial frictional resistance when the auger 6 rotates, and ensures that the auger 6 rotates smoothly.

[0063] The scraper 63 can be selected with a single spiral structure or a multi-spiral structure according to actual working conditions: the single spiral structure is simple to process and is suitable for scenarios with a low carbon buildup rate; the multi-spiral structure can increase the number of carbon buildup removals per unit time and enhance the flow guiding effect, making it suitable for scenarios with a high carbon buildup rate and higher requirements for preheating effect, thus improving the adaptability of the device to working conditions.

[0064] In this embodiment, the drive mechanism of motor 1 with gear transmission operates stably and the speed is controllable, which can accurately match the carbon deposit removal requirements; the bearing support structure improves the rotational accuracy and stability of the external coupler 4 and ensures the efficiency of magnetic coupling transmission; the annular end face of the distribution ring 7 optimizes the axial support and friction reduction effect of the auger 6; the selectable spiral scraper 63 structure improves the device's adaptability to different working conditions.

[0065] Example 7: Figures 1-8 As shown, this embodiment is the optimal implementation of the present invention, integrating all the above-mentioned optimized structures to provide a complete magnetic coupling carbon deposit removal device for burners.

[0066] This device includes a combustion chamber 5, which is composed of an inner cylinder 51 and an outer cylinder 52 arranged coaxially. The bottoms of the inner cylinder 51 and the outer cylinder 52 are fixedly connected to form a pressure equalization chamber 53. A hollow annular cavity is formed between the inner cylinder 51 and the outer cylinder 52. The annular opening at the top of the annular cavity is sealed by a distribution ring 7. The distribution ring 7 is connected to a fuel pipe 8 for the flow of fuel at room temperature. The pressure equalization chamber 53 is connected to an injection pipe 9 for supplying preheated fuel to the combustion chamber of the combustion chamber 5. A nozzle 10 is connected to the end of the injection pipe 9.

[0067] A auger 6 is floatingly installed inside the annular cavity. The auger 6 includes an inner coupler 61 and a auger cage 62, which are fixedly connected from top to bottom. The inner coupler 61 is a magnetic ring support structure with through holes 612 for fuel passage and blind holes for mounting inner permanent magnets 613 arranged in a circumferential array on its surface. The top end face of the inner coupler 61 has at least three mounting holes 611 arranged in a circumferential array. A ball bearing mechanism is detachably installed in the mounting holes 611, and the ball bearing mechanism abuts against the annular end face of the distribution ring 7. A spiral scraper 63 is integrally provided on the inner and outer circumferential sidewalls of the auger cage 62. The scraper 63 extends toward the inner cylinder 51 and the outer cylinder 52 respectively to form an inner convex ridge and an outer convex ridge. The gap K1 between the inner convex ridge and the inner cylinder 51 and the gap K2 between the outer convex ridge and the outer cylinder 52 satisfy: 1.5mm > K1 + K2 > 0.1mm. The scraper 63 adopts a multi-spiral structure with mutual parallel spirals.

[0068] An external coupler 4 is rotatably mounted on the outer circumferential sidewall of the combustion chamber 5. The external coupler 4 includes a gear ring 41 and a magnetic shield 42 coaxially fixedly connected. Multiple external permanent magnets 43 are fixedly mounted in a circumferential array on the inner sidewall of the magnetic shield 42. The external permanent magnets 43 and the inner permanent magnets 613 are installed opposite each other and their opposite side magnetic poles are engaged. Multiple threaded holes 44 are arranged in a circumferential array on the magnetic shield 42 between adjacent external permanent magnets 43. A ball bearing mechanism is installed in the threaded holes 44 and abuts against the outer sidewall of the combustion chamber 5. The lower part of the external coupler 4 extends downward to form a bearing seat. A bearing is installed in the bearing seat and fixedly sleeved on the outer circumferential sidewall of the combustion chamber 5.

[0069] The device also includes a drive mechanism, which includes a mounting bracket and a motor 1 fixed on the mounting bracket. A pinion 2 is mounted on the output shaft of the motor 1, and the pinion 2 meshes with a gear ring 41 for transmission.

[0070] Working principle: Room temperature liquid fuel is delivered to the distribution ring 7 through the fuel pipe 8. The distribution ring 7 evenly feeds the fuel into the top of the annular cavity along the circumferential direction. The fuel enters the area of ​​the auger 62 through the through hole 612 on the inner coupler 61. Under the guidance of the spiral scraper 63, it flows downward along the spiral path. During the flow, the fuel absorbs the heat generated by combustion inside the combustion chamber 5 through the walls of the inner cylinder 51 and the outer cylinder 52, gradually heating up and preheating until it vaporizes. Finally, it flows into the pressure equalization chamber 53 at the bottom for mixing and pressure stabilization, and then is delivered to the nozzle 10 through the injection pipe 9 and injected into the combustion chamber 5 for complete combustion.

[0071] During the preheating process of the fuel in the high-temperature annular cavity, carbon is released due to the high temperature and adheres to the outer wall of the inner cylinder 51 and the inner wall of the outer cylinder 52, forming carbon deposits. After the motor 1 starts, it drives the pinion 2 to rotate, which in turn drives the gear ring 41 to rotate the outer coupler 4 around the axis of the combustion chamber 5 through gear meshing. The outer permanent magnet 43 on the outer coupler 4 rotates synchronously, which drives the inner permanent magnet 613 to rotate synchronously with the inner coupler 61 through magnetic coupling, thereby driving the cutter 6 to rotate continuously in the annular cavity.

[0072] The auger 6 adopts a floating installation method. During rotation, the inner and outer convex edges of the scraper 63 adaptively conform to the two side walls, continuously scraping away newly formed carbon deposits on the walls. The scraped carbon deposits enter the pressure equalization chamber 53 with the fuel flow and are eventually burned completely in the combustion chamber 5, preventing carbon deposits from accumulating and clogging the channels. The ball bearing mechanism at the top of the auger 6 cooperates with the annular end face of the distribution ring 7, and the ball bearing mechanism of the external coupler 4 cooperates with the outer wall of the combustion chamber 5, both converting sliding friction into rolling friction, significantly reducing rotational resistance and improving transmission efficiency and operational stability. The external coupler 4 achieves radial positioning and axial support through bearings, ensuring the coaxiality and stability of the magnetic coupling transmission.

[0073] This embodiment integrates all optimized structures, possessing multiple advantages such as high preheating efficiency, thorough carbon removal, stable and reliable transmission, excellent sealing performance, long service life, and low maintenance costs; sufficient fuel preheating results in high combustion efficiency and significant energy-saving effects; continuous online carbon removal completely solves the problem of carbon buildup blockage in the preheating channel, greatly improving the burner's continuous operating time and reliability, making it an ideal carbon removal device for flame weeding burners.

[0074] Example 8: The present invention also provides a burner 3, such as Figure 1 As shown, the magnetically coupled carbon removal device provided in any of the above embodiments is provided. The inlet end of the combustion chamber 5 is equipped with a nozzle 10 for injecting preheated fuel. The injection direction of the nozzle 10 is consistent with the axial direction of the combustion chamber 5. The burner 3 also includes a flame nozzle, which is flat and installed at the outlet end of the combustion chamber 5.

[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A magnetic coupling soot cleaning device for a burner comprising a combustion chamber (5), characterized in that The combustion chamber (5) has a hollow annular cavity. A auger (6) for scraping carbon deposits adhering to the two side walls of the annular cavity is rotatably installed inside the annular cavity. The auger (6) includes an inner coupler (61) set at the top. An outer coupler (4) is rotatably installed on the outer circumferential side wall of the combustion chamber (5). The inner coupler (61) is magnetically coupled to the outer coupler (4) and rotates synchronously with the outer coupler (4).

2. A magnetic coupling carbon cleaning device for a burner as claimed in claim 1, wherein: The auger (6) includes an inner coupler (61) and a auger cage (62) that are fixedly connected from top to bottom. The inner and outer circumferential sidewalls of the auger cage (62) are provided with spiral scrapers (63). At least three mounting holes (611) are distributed in a circumferential array on the top end face of the inner coupler (61) and / or the circumferential sidewalls of the auger cage (62). A ball bearing mechanism for reducing friction can be detachably installed in the mounting holes (611).

3. A magnetic coupling carbon cleaning device for a burner as claimed in claim 1, wherein: The combustion chamber (5) includes an inner cylinder (51) and an outer cylinder (52) arranged coaxially. The bottom of the inner cylinder (51) and the outer cylinder (52) are fixedly connected to form a pressure equalization chamber (53) for fuel flow. The pressure equalization chamber (53) is connected to an injection pipe (9) for supplying preheated fuel to the combustion chamber (5). The annular opening formed at the top of the annular cavity of the combustion chamber (5) is sealed by a fixedly installed distribution ring (7), and the distribution ring (7) is connected to a fuel pipe (8) for the flow of room temperature fuel.

4. A magnetic coupling carbon removal device for a burner as claimed in claim 3, wherein: The auger (6) also includes a auger cage (62) coaxially fixedly connected to the lower end of the inner coupler (61). The auger cage (62) is integrally provided with a spiral scraper (63). The scraper (63) extends toward the inner cylinder (51) and the outer cylinder (52) respectively to form an inner convex ridge and an outer convex ridge for scraping off the carbon deposits attached to the inner cylinder (51) and the outer cylinder (52). The gap K1 between the inner convex ridge and the inner cylinder (51) and the gap K2 between the outer convex ridge and the outer cylinder (52) satisfy: 1.5mm≥K1+K2≥0.1mm.

5. A magnetically coupled carbon deposit removal device for a burner according to claim 1, characterized in that: The inner coupler (61) includes a magnetic ring support, on which through holes (612) for fuel passage and blind holes for mounting inner permanent magnets (613) are arranged in a circumferential array; the outer coupler (4) includes a magnetic shield (42), on which multiple outer permanent magnets (43) are fixedly mounted in a circumferential array, wherein any one of the inner permanent magnets (613) and the outer permanent magnets (43) are mounted facing each other and their magnetic poles are opposite on opposite sides.

6. A magnetic coupling carbon cleaning device for a burner as claimed in claim 5, wherein: The external coupler (4) includes a gear ring (41), a magnetic shield (42) coaxially fixed on the gear ring (41), a plurality of external permanent magnets (43) are mounted in a circumferential array on the inner side wall of the magnetic shield (42), and a plurality of threaded holes (44) are arranged in a circumferential array on the magnetic shield (42). Each threaded hole (44) is located between two adjacent external permanent magnets (43), and a ball bearing mechanism for reducing the frictional resistance between the external coupler (4) and the outer side wall of the combustion chamber (5) is installed in the threaded hole (44).

7. A magnetic coupling carbon removal device for a burner as claimed in any one of claims 1 to 5, characterised in that: It also includes a drive mechanism for driving the external coupler (4), the drive mechanism including a mounting bracket, a motor (1) mounted on the mounting bracket, a pinion (2) mounted on the output shaft of the motor (1), the pinion (2) meshing with a gear ring (41) coaxially arranged with the external coupler (4) to drive the external coupler (4) to rotate along the axis of the combustion chamber (5).

8. A magnetic coupling carbon removal device for a burner as claimed in any one of claims 1 to 5, characterised in that: The external coupler (4) extends downward from the circumferential sidewall of the combustion chamber (5) to form a bearing seat. A bearing is installed in the bearing seat and fixedly sleeved on the outer circumferential sidewall of the combustion chamber (5), so that the external coupler (4) can rotate relative to the combustion chamber (5).

9. A magnetic coupling carbon cleaning device for a burner as claimed in claim 2, wherein: The annular opening formed at the top of the annular cavity of the combustion chamber (5) is sealed by a fixedly installed distribution ring (7). The distribution ring (7) has an annular end face on the side near the auger (6) for contacting the ball mechanism to reduce friction.

10. A magnetic coupling carbon cleaning device for a burner as claimed in claim 2, wherein: The scraper (63) has a single spiral or a multi-spiral structure arranged in parallel with each other.

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