A burner flame holder

Abstract

The application discloses a combustor stable cover. The device is coaxially provided with an outer cylinder and an inner cylinder, rotatable blades are arranged between the outer cylinder and the inner cylinder, fixed shafts with rollers are assembled on the upper and lower ends of the blades, L-shaped sliding grooves are arranged on the outer cylinder to limit the rollers, the upper end fixed shafts of the blades are connected with a connecting frame in the cylinder through a second sliding groove matched with the sliding grooves, the connecting frame is driven to ascend and descend by a lead screw assembly, and a protective shell is arranged outside the lead screw to resist high-temperature flue gas erosion. When the device is adjusted, the lead screw drives the connecting frame to move vertically, the rollers constrain the blades to rotate synchronously along the L-shaped sliding groove track, the opening degree of the blades is steplessly changed, the swirling intensity of the airflow in the annular channel is flexibly adjusted and controlled, and the device is suitable for various fuel and load working conditions. The device can adjust the airflow disturbance as required, i.e., a large opening degree is used to strengthen air-fuel mixing and improve combustion efficiency, and a small opening degree is used to adapt to low load stable combustion; uniform premixing can reduce local high temperature and inhibit the generation of nitrogen oxides; the protective shell guarantees long-term reliable work of the adjusting mechanism, and the problems of poor working condition adaptation, low combustion efficiency and high nitrogen oxide emission of traditional stable covers are solved.

Description

Technical Field

[0001] This invention belongs to the field of burner technology and relates to a burner flame stabilization cover. Background Technology

[0002] As the core heat energy conversion device in a boiler system, the burner's core function is to mix air and fuel in a specific ratio through a precise premixing mechanism, achieving efficient conversion of chemical energy into thermal energy through combustion. In the field of industrial combustion, the burner's performance directly determines the boiler's thermal efficiency and emission standards. Especially against the backdrop of current global energy structure transformation and increasingly stringent environmental policies, developing efficient, low-NOx, and highly adaptable combustion technologies has become an industry consensus. With the widespread adoption of clean energy sources such as natural gas, burners not only need to meet stable operation under high heat loads but also maintain flame stability under low load conditions, while strictly controlling the generation of nitrogen oxides (NOx). This places extremely high demands on the burner's aerodynamic structure design and mixing control capabilities.

[0003] To address the aforementioned needs, various low-NOx combustion technologies have emerged in the existing technology field. Among them, swirl-based stabilization combustion technology is widely used because it can enhance turbulent mixing and expand the stable combustion range by utilizing centrifugal force fields. For example, Chinese patent CN107191932A discloses a typical low-NOx burner structure. This device mainly consists of a cylinder, an air regulator, and combustion components. Its core design lies in fixing the swirl blades inside the stabilization hood by welding. This rigid connection structure aims to create a fixed swirl field, guiding the airflow to rotate to enhance fuel-air mixing, thereby reducing the formation of local high-temperature zones to a certain extent and suppressing the generation of thermal NOx. This technical solution represents a relatively mature mechanical stabilization combustion design concept in current industrial burners, that is, shaping the flow field structure through a preset geometric flow channel shape.

[0004] However, while the aforementioned existing technologies can achieve basic combustion functions under specific operating conditions, their inherent structural defects limit their further application effectiveness. Because the swirl blades are fixedly connected to the combustion hood using a welding process, the blade angle becomes a fixed, non-adjustable value after manufacturing. This rigid structure lacks dynamic adaptability to varying operating conditions. In actual industrial operation, boiler loads often fluctuate with production demands, and the calorific value and pressure of the fuel may also change. A fixed blade angle means that the airflow swirl intensity and mixing path cannot be optimized and adjusted according to real-time operating conditions. When operating conditions deviate from the design point, the fixed mixing mode often leads to uneven mixing of air and natural gas, making it difficult to maintain optimal combustion efficiency and potentially causing incomplete combustion due to localized oxygen deficiency or mixing lag, thereby increasing pollutant emissions. Furthermore, the lack of adjustment methods prevents operators from compensating for fluctuations in fuel characteristics through physical structural adjustments, significantly reducing the burner's operational flexibility and fuel adaptability, making it difficult to meet the dual stringent standards of modern industry for wide load adjustment and ultra-low emissions in combustion equipment. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a burner stabilizing cover, thereby solving the technical problem that the angle of the burner swirl blades cannot be adjusted due to welding fixation, making it difficult to adapt to changes in operating conditions, resulting in poor mixing effect, reduced combustion efficiency and increased nitrogen oxide emissions.

[0006] This invention is achieved through the following technical solution: A burner flame stabilizer includes an outer cylinder and an inner cylinder arranged coaxially, with a plurality of rotatable blades provided between the outer cylinder and the inner cylinder; The upper and lower ends of the blade are respectively fixed with fixed shafts, and each fixed shaft end is rotatably equipped with a roller; the outer cylinder side wall is provided with an L-shaped sliding groove, and the roller is in rolling cooperation with the L-shaped sliding groove; The outer cylinder is provided with a connecting frame, and the upper fixed shaft passes through the second slide groove on the L-shaped slide groove and is fixedly connected to the connecting frame. A lead screw assembly for driving the vertical movement of the connecting frame is installed below the connecting frame; a protective shell is provided on the outside of the lead screw assembly, and the upper and lower ends of the protective shell are respectively fixedly connected to the side wall of the outer cylinder.

[0007] Optionally, four blades are evenly arranged around the inner cylinder axis along the circumference, with the inner side of the blades fitting against the outer wall of the inner cylinder.

[0008] Optionally, the fixed shaft is divided into an upper fixed shaft and a lower fixed shaft, with the upper fixed shaft fixed at the upper end of the blade and the lower fixed shaft fixed at the lower end of the blade.

[0009] Optionally, a first roller is rotatably mounted at the middle of the upper fixed shaft, and a second roller is rotatably mounted at the end of the lower fixed shaft; the first roller rolls in contact with the vertical section of the L-shaped groove, and the second roller rolls in contact with the lower section of the L-shaped groove.

[0010] Optionally, the L-shaped groove includes a vertical portion and an inclined portion extending from the lower end of the vertical portion.

[0011] Optionally, the second slide groove is formed through the rear side of the vertical section of the L-shaped slide groove, and the upper fixed shaft is slidably adapted to the second slide groove.

[0012] Optionally, two sets of the lead screw assembly are arranged symmetrically with the axis of the inner cylinder as the center.

[0013] Optionally, the lead screw assembly includes a movable seat, which is fixedly connected to the lower side of the connecting frame.

[0014] Optionally, the lead screw assembly has a self-locking structure that can lock the vertical displacement position of the connecting frame.

[0015] Optionally, the outer cylinder and the inner cylinder form an annular airflow channel, and the rotation of the blades adjusts the swirling intensity of the airflow within the annular airflow channel.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: This invention discloses a burner stabilizing cover, which solves the defects of traditional welded swirl blades with fixed angles through an adjustable blade mechanism. Rotatable blades are assembled between the coaxially arranged outer and inner cylinders, eliminating the structure of blades being welded and fixed to the cylinder body. Fixed shafts with rollers are fixed at the upper and lower ends of the blades. An L-shaped groove is formed on the side wall of the outer cylinder for the rollers to roll and limit their movement. The fixed shaft at the upper end of the blade passes through a second groove matching the L-shaped groove and is fixed to the inner connecting frame. The connecting frame is driven vertically by a lower screw assembly, and a protective shell is provided on the outside of the screw assembly to prevent high-temperature corrosion failure. During actual adjustment, the screw assembly drives the connecting frame to move up and down, simultaneously pulling the fixed shafts at the upper ends of all blades along the groove trajectory. The rollers, constrained by the L-shaped groove contour, drive the blades to rotate synchronously, continuously changing the blade opening and closing angle, flexibly adjusting the airflow swirl intensity within the annular channel, and adapting to different fuel and load combustion conditions. Compared to existing welded fixed blades that cannot be adjusted in angle and have a single air-fuel mixture state, this device can optimize the degree of airflow disturbance in real time according to the operating conditions. When the blade opening is increased, the air-fuel mixing path is extended and the mixing uniformity is enhanced. When the opening is reduced, it adapts to the low-load stable combustion requirements, ensuring complete combustion of fuel throughout the process and improving combustion thermal efficiency. At the same time, the uniform and stable premixing effect can reduce local high-temperature zones and significantly suppress the generation of thermal nitrogen oxides. The shell can protect the screw adjustment mechanism from the corrosion of flue gas dust, maintain the blade angle adjustable function for a long time, and avoid the loss of adaptability due to the failure of the adjustment mechanism. It solves the technical pain points of poor adaptability, low combustion efficiency, and high nitrogen oxide emissions caused by the non-adjustable blades of traditional stable combustion hoods from the root of the structure.

[0017] Furthermore, four blades are evenly arranged around the inner cylinder axis along the circumference, with the inner side of the blades adhering to the outer wall of the inner cylinder. The four blades, evenly arranged at equal angles, can form a symmetrical and balanced swirling field within the annular airflow channel, avoiding the problems of airflow deviation and uneven mixing caused by a single number of blades or unequal spacing. The inner side of the blades adhering to the outer wall of the inner cylinder can seal the gap between the blades and the inner cylinder, preventing the combustion air from escaping through a short circuit from the inner side of the blades. This ensures that all the airflow completes swirling mixing through the gap between the blades. At the same time, the force is uniform when the four blades are adjusted synchronously, and there is no interference or jamming during the rotation process, further improving the uniformity of air-fuel mixing and the operational stability of the device.

[0018] Furthermore, the fixed shaft is divided into an upper fixed shaft and a lower fixed shaft. The upper fixed shaft is fixed to the upper end of the blade, and the lower fixed shaft is fixed to the lower end of the blade. The structure of simultaneously constraining both ends of the blade with the upper and lower fixed shafts is different from the defects of single-axis fixed blades, such as unilateral force, plate surface skewing, and rotational offset. The dual-axis structure can simultaneously limit and support the upper and lower ends of the blade, so that the blade is subjected to balanced force. During the rotation, the plate surface always remains flat and will not warp or deflect. At the same time, the upper and lower split shafts can respectively cooperate with the two sets of rollers in the slide groove to form a dual-point guide, providing a reliable structural basis for stepless adjustment of the blade angle.

[0019] Furthermore, a first roller is rotatably mounted at the middle of the upper fixed shaft, and a second roller is rotatably mounted at the end of the lower fixed shaft. The first roller rolls in cooperation with the vertical section of the L-shaped groove, and the second roller rolls in cooperation with the lower section of the L-shaped groove. The two sets of rollers roll in cooperation with the vertical section and the lower section of the L-shaped groove, respectively. Through the synchronous limiting and guiding of the upper and lower rollers at two points, the movement trajectory of the upper and lower ends of the blade can be constrained, avoiding blade offset and jamming faults caused by single roller guidance. The linkage between the lifting and lowering of the first roller along the vertical section and the synchronous sliding of the second roller along the lower section can accurately transmit the displacement difference brought by the groove contour, smoothly drive the blade to rotate synchronously, ensure that the adjustment angle of all blades is uniform, and the airflow disturbance effect is consistent.

[0020] Furthermore, the L-shaped chute includes a vertical section and an inclined section extending from the lower end of the vertical section. The L-shaped chute is composed of the vertical section and the inclined section extending from the lower end. The vertical section constrains the first roller to only perform vertical lifting and lowering, while the inclined section changes the horizontal and vertical combined displacement of the second roller. The two sets of rollers generate a positional difference as the connecting frame rises and falls, and the blade opening and closing angle is continuously changed by relying on the contour of the inclined track. This integrated chute structure can complete the conversion of linear displacement into blade rotation without additional transmission components. It has a simple structure, good adjustment linearity, and can accurately control the intensity of airflow swirl, making it suitable for a wide range of combustion conditions.

[0021] Furthermore, the second slide groove is opened through the rear side of the vertical section of the L-shaped slide groove. The upper fixed shaft is slidably adapted to the second slide groove. The second slide groove is opened through the rear side of the vertical section of the L-shaped slide groove and is slidably adapted to the upper fixed shaft. The second slide groove provides an avoidance channel for the upper fixed shaft to pass through the outer cylinder side wall, and at the same time forms a horizontal limit on the shaft body to prevent horizontal deviation during the lifting and lowering of the upper fixed shaft, ensuring that the upper fixed shaft of all blades moves synchronously and with equal amplitude, and that the adjustment angle of each blade is without deviation. The slide groove is integrally opened on the outer cylinder side wall, eliminating the need for additional openings and welding of adapters, simplifying the processing and assembly process, and avoiding the assembly misalignment and shaft jamming problems that are prone to occur in split slide grooves.

[0022] Furthermore, two sets of lead screw assemblies are symmetrically arranged around the axis of the inner cylinder. The two sets of lead screw assemblies are symmetrically arranged around the axis of the inner cylinder. The symmetrical double lead screws can apply uniform vertical driving force synchronously from both sides of the bottom of the connecting frame, which solves the problem of unbalanced force on the connecting frame and tilting and jamming caused by the single lead screw applying force on one side. This keeps the connecting frame in a horizontal lifting state throughout the entire process, and synchronously drives the fixed shafts on all blades to move synchronously, ensuring that the opening and closing angle of each blade is completely consistent. The airflow distribution in the annular channel is symmetrical and uniform, and there will be no situation where the vortex on one side is too strong and the mixing on the other side is insufficient, which greatly improves the stability of the device adjustment.

[0023] Furthermore, the lead screw assembly includes a movable seat, which is fixedly connected to the lower side of the connecting frame. The movable seat, which is fixedly connected to the lower side of the connecting frame, serves as a force transmission transition component between the lead screw and the connecting frame, increasing the contact area between the two, dispersing concentrated loads during the lifting and adjusting process, and preventing local stress concentration deformation and damage to the connecting frame. The vertical power output by the lead screw is completely and evenly transmitted to the entire connecting frame through the movable seat without power loss, ensuring precise matching between the lifting stroke of the connecting frame and the feed amount of the lead screw, resulting in higher blade angle adjustment accuracy and a stable and reliable force transmission structure.

[0024] Furthermore, the lead screw assembly has a built-in self-locking structure that can lock the vertical displacement position of the connecting frame. The lead screw assembly integrates a self-locking structure, which can lock the rotation of the lead screw and fix the vertical position of the connecting frame after the blades are adjusted to the target operating angle. When the burner operates at high temperatures for a long time and the airflow continuously impacts the blades, the self-locking structure can resist the displacement trend caused by the airflow impact, prevent the blade angle from shifting on its own, stably maintain the preset swirling intensity, and continuously ensure sufficient air-fuel mixing and low-NOx combustion effect. There is no need to add external locking parts such as locking pins and buckles, simplifying the overall structure and avoiding the risk of corrosion failure of external locking parts under high temperature.

[0025] Furthermore, an annular airflow channel is formed between the outer and inner cylinders. The rotation of the blades adjusts the swirling intensity of the airflow within the annular airflow channel. This structure confines the combustion air within the annular channel and changes the degree of airflow disturbance by rotating the blades. Under high load conditions, the larger blade opening enhances the swirling flow, extends the mixing path between air and fuel, strengthens the mixing uniformity, and improves combustion efficiency. Under low load conditions, the smaller opening weakens the swirling flow, stabilizes the flame, and prevents flameout. This structure can adapt to different fuels and boiler load conditions, fundamentally improving the shortcomings of traditional fixed blades in terms of single mixing effect and poor adaptability to operating conditions, reducing local high-temperature zones, and lowering the amount of nitrogen oxides generated. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of a burner flame stabilizer cover according to the present invention (viewpoint 1). Figure 2 This is a three-dimensional structural schematic diagram (view 2) of an embodiment of a burner stabilizing cover according to the present invention. Figure 3 for Figure 2 Sectional view of AA; Figure 4 This is a three-dimensional structural schematic diagram (view 3) of an embodiment of a burner stabilizing cover according to the present invention. Among them, 1. Outer cylinder; 2. Inner cylinder; 3. Blade; 4. Fixed shaft; 6. L-shaped slide groove; 7. Connecting frame; 8. Screw assembly; 9. Protective shell; 401. Upper fixed shaft; 402. Lower fixed shaft; 601. Second slide groove; 801. Moving seat. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] 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.

[0031] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present 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, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "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 of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings: Example 1 like Figure 1-4 As shown, the present invention discloses a burner stabilizing cover, comprising an outer cylinder 1 and an inner cylinder 2 arranged coaxially, wherein a plurality of rotatable blades 3 are provided between the outer cylinder 1 and the inner cylinder 2; the upper and lower ends of the blades 3 are respectively fixed with fixed shafts 4, and each fixed shaft 4 is rotatably equipped with a roller at its end; an L-shaped groove 6 is provided on the side wall of the outer cylinder 1, and the rollers are in rolling cooperation with the L-shaped groove 6; The outer cylinder 1 is provided with a connecting frame 7, and the upper fixed shaft 4 passes through the second slide groove 601 on the L-shaped slide groove 6 and is fixedly connected to the connecting frame 7. Below the connecting frame 7, a lead screw assembly 8 is installed for driving the connecting frame 7 to move vertically; a protective shell 9 is provided on the outside of the lead screw assembly 8, and the upper and lower ends of the protective shell 9 are respectively fixedly connected to the side wall of the outer cylinder 1.

[0035] The burner stabilizing cover of this invention consists of an outer cylinder 1 and an inner cylinder 2 arranged coaxially. Several rotatable blades 3 are distributed within the annular space formed by the two. Fixed shafts 4 are fixed to the upper and lower ends of each blade 3, and rollers are rotatably mounted at the ends of each fixed shaft 4. An L-shaped groove 6 is formed on the side wall of the outer cylinder 1, and the rollers on the blades 3 roll in cooperation with the L-shaped groove 6, thereby limiting the movement trajectory of the blades. The device also includes a connecting frame 7 located inside the outer cylinder 1. The fixed shaft 4 at the upper end of the blade 3 passes through a second groove 601 on the L-shaped groove 6 and is fixedly connected to the connecting frame 7. A lead screw assembly 8 is mounted below the connecting frame 7 to drive the connecting frame 7 to move vertically, thereby rotating the blades 3 through the cooperation of the fixed shafts 4 and the L-shaped groove 6 to adjust the opening and closing angle. Furthermore, a protective shell 9 is fitted around the lead screw assembly 8, with its upper and lower ends fixedly connected to the side wall of the outer cylinder 1 to protect the internal driving components.

[0036] Furthermore, four blades 3 are evenly arranged around the axis of the inner cylinder 2 along the circumference, and the inner side of the blades 3 is attached to the outer wall of the inner cylinder 2.

[0037] Specifically, in this invention, multiple blades 3 are arranged in a ring along the central axis of the inner cylinder 2. The total number of blades 3 is set to four. The four blades 3 are distributed at equal angles within the annular airflow cavity formed by the inner cylinder 2 and the outer cylinder 1. The inner vertical edge of each blade 3 is always fitted against the outer cylindrical wall of the inner cylinder 2. This not only provides limiting support for the inner side of the blades 3 by relying on the outer wall of the inner cylinder 2, ensuring that there is no obvious airflow gap on the inner side of the blades 3 during rotation and preventing airflow from short-circuiting and losing from the inner side of the blades 3, but also allows the four equally spaced blades 3 to form a symmetrical and uniform swirling airflow field within the annular channel. This causes the combustion air flowing through the gaps between the blades 3 to generate uniform and stable swirling disturbances, ensuring that the air and fuel are fully mixed.

[0038] Furthermore, the fixed shaft 4 is divided into an upper fixed shaft 401 and a lower fixed shaft 402. The upper fixed shaft 401 is fixed to the upper end of the blade 3, and the lower fixed shaft 402 is fixed to the lower end of the blade 3.

[0039] In this embodiment, each blade 3 is equipped with two independent fixed shafts 4 along its vertical height. The two fixed shafts 4 are divided into an upper fixed shaft 401 and a lower fixed shaft 402. The upper fixed shaft 401 is horizontally fixedly installed on the upper side of the blade 3, and the lower fixed shaft 402 is horizontally fixedly installed on the lower side of the blade 3. The upper fixed shaft 401, the lower fixed shaft 402 and the blade 3 are rigidly connected. The upper and lower shafts synchronously constrain the upper and lower ends of the blade 3, which can avoid the problem of unilateral force and deflection caused by the blade 3 having only one side of the shaft. It ensures that the plate surface of the blade 3 remains flat and the force is uniform and stable during the overall rotation of the blade 3. At the same time, the upper and lower split fixed shaft 4 structure can cooperate with rollers at different positions in the L-shaped slide 6. With the help of the synchronous guide trajectory of the upper and lower rollers, the blade 3 is driven to complete the angle flipping adjustment.

[0040] In addition, a first roller is rotatably mounted in the middle of the upper fixed shaft 401, and a second roller is rotatably mounted at the end of the lower fixed shaft 402; the first roller is in rolling engagement with the vertical section of the L-shaped slide groove 6, and the second roller is in rolling engagement with the lower section of the L-shaped slide groove 6.

[0041] In this preferred embodiment, a first roller is rotatably mounted at the middle position of the upper fixed shaft 401, and a second roller is rotatably mounted at the end of the lower fixed shaft 402 away from the blade 3. Both the first and second rollers can roll freely inside the L-shaped groove 6. The first roller is adapted to abut against the inner wall of the vertical section of the L-shaped groove 6 and rolls and slides up and down along the vertical section. The second roller is adapted to abut against the inner wall of the lower section of the L-shaped groove 6 and slides synchronously along the lower section. Through the rolling cooperation of the upper and lower rollers with different sections of the L-shaped groove 6, a dual-point synchronous limiting guide can be formed at the upper and lower ends of the blade 3, so that the movement trajectory of the upper fixed shaft 401 and the lower fixed shaft 402 is completely constrained by the contour of the L-shaped groove 6. This avoids the blade offset and jamming problems that are easy to occur with single roller guidance, and ensures that the blade 3 can smoothly and synchronously complete the angle flipping under the adjustment action.

[0042] The L-shaped groove 6 includes a vertical portion and an inclined portion extending from the lower end of the vertical portion.

[0043] Furthermore, the L-shaped chute 6, located on the side wall of the outer cylinder 1, is composed of two sections: a vertical section extending vertically and an inclined section extending integrally from the lower end of the vertical section and arranged at an angle downwards. The vertical and inclined sections are smoothly connected to form a complete L-shaped guide track. The vertical section is used to constrain the first roller to only move vertically, while the inclined section is used to limit the movement trajectory of the second roller. Based on the inclined profile of the inclined section, when the first roller slides up and down along the vertical section, the second roller will simultaneously move obliquely along the inclined section, thereby creating a positional difference between the upper and lower rollers. This drives the blade 3 to rotate around its inner contact point, achieving continuous stepless adjustment of the opening and closing angle of the blade 3. The integrally formed two-section chute structure can precisely control the rotation amplitude of the blade 3, ensuring linear and controllable adjustment of the airflow swirl intensity.

[0044] The second slide groove 601 is opened through the rear side of the vertical section of the L-shaped slide groove 6, and the upper fixed shaft 401 is slidably adapted to the second slide groove 601.

[0045] Specifically, a second slide groove 601 is formed through the vertical section of the L-shaped slide groove 6 facing the rear wall of the cylinder. The second slide groove 601 is connected to the vertical section of the L-shaped slide groove 6 and the two extend in the same direction. The upper fixed shaft 401 passes through the second slide groove 601 and forms a sliding fit with it. The second slide groove 601 provides a passage for the upper fixed shaft 401 to pass through the side wall of the outer cylinder 1. At the same time, it plays a role in horizontal limiting and vertical guiding of the upper fixed shaft 401, so that the upper fixed shaft 401 can only follow the first roller to move up and down in a straight line along the vertical section of the L-shaped slide groove 6, and will not deviate in the horizontal direction. This ensures that the upper fixed shaft 401 can stably drive the connecting frame 7 to rise and fall synchronously, and avoids the problem of the upper fixed shaft 401 getting stuck or deviating during the adjustment process, which would cause the adjustment angle of each blade 3 to be inconsistent.

[0046] Furthermore, the lead screw assembly 8 is arranged symmetrically in two sets with the axis of the inner cylinder 2 as the center.

[0047] Specifically, two sets of lead screw assemblies 8 are provided to drive the vertical movement of the connecting frame 7. The two sets of lead screw assemblies 8 are arranged symmetrically on both sides of the bottom of the connecting frame 7 with the central axis of the inner cylinder 2, which is coaxial with the inner and outer cylinders, as the symmetry reference. The symmetrical double lead screw arrangement structure can apply uniform lifting driving force from both ends of the connecting frame 7 simultaneously, avoiding the defects of force imbalance and lifting tilt jamming caused by the single set of lead screws applying force on one side. This ensures that the connecting frame 7 remains horizontal throughout the vertical lifting process, thereby synchronously driving the upper fixed shaft 401 of all blades 3 to move synchronously and with equal amplitude, so that the opening and closing adjustment angle of all blades 3 is consistent, forming a uniform and symmetrical swirling airflow field in the annular channel, improving the overall adjustment stability and airflow uniformity of the device.

[0048] In a more preferred embodiment, the lead screw assembly 8 includes a movable seat 801, which is fixedly connected to the lower side of the connecting frame 7.

[0049] More specifically, each set of lead screw assembly 8 is equipped with a movable seat 801. The movable seat 801 serves as an intermediate force transmission component between the lead screw assembly 8 and the connecting frame 7. Its top surface is rigidly fixed to the bottom surface of the connecting frame 7. When the lead screw assembly 8 is in operation, the linear lifting power of the lead screw is directly transmitted to the movable seat 801. The movable seat 801 then evenly transmits the vertical driving force to the entire connecting frame 7. The movable seat 801 can increase the contact area between the lead screw assembly 8 and the connecting frame 7, disperse the stress load during the adjustment process, and prevent the connecting frame 7 from deforming due to local stress concentration. At the same time, it can ensure that the lifting stroke of the lead screw assembly 8 is transmitted to the connecting frame 7 completely and without loss, ensuring that the connecting frame 7 completes the vertical displacement action synchronously and smoothly with the lead screw.

[0050] In a more preferred embodiment, the lead screw assembly 8 has a self-locking structure that can lock the vertical displacement position of the connecting frame 7.

[0051] Specifically, the lead screw assembly 8 integrates a self-locking structure. This self-locking structure relies on the self-locking characteristics of the lead screw's own thread pair to achieve a positioning function without additional locking components. When the lead screw assembly 8 drives the moving seat 801 to complete the vertical lifting and lowering of the connecting frame 7 and adjust the blade 3 to the target opening and closing angle, the drive operation on the lead screw is stopped. The self-locking structure can lock the rotation state of the lead screw by relying on the thread engagement friction, thereby fixing the current vertical displacement position of the moving seat 801 and the connecting frame 7 fixed to it. Under the conditions of long-term high-temperature operation of the burner and continuous airflow impact on the blade 3, it can effectively prevent the connecting frame 7 from sliding due to airflow disturbance, stably maintain the adjustment angle of the blade 3, ensure a constant air-fuel mixing swirl intensity, and continuously and stably achieve a low-NOx combustion effect. There is no need to add additional external locking accessories such as buckles and locking pins, simplifying the overall structure and reducing the risk of locking component failure under high-temperature conditions.

[0052] Furthermore, the outer cylinder 1 and the inner cylinder 2 form an annular airflow channel, and the blade 3 rotates to adjust the swirling intensity of the airflow within the annular airflow channel.

[0053] The outer cylinder 1 and the inner cylinder 2, which are coaxially assembled, form a complete and continuous annular airflow channel between their side walls. Combustion air can flow downward from the top of the device along this annular airflow channel. The blades 3 distributed inside the annular airflow channel can rotate synchronously with the adjustment mechanism. By changing the tilting angle of the blades 3 relative to the airflow direction, the magnitude of the guiding turbulence effect on the airflow when it passes through the blades 3 can be adjusted. The larger the opening angle of the blades 3, the stronger the swirling turbulence generated by the airflow guided by the blades. The mixing path between the air and the fuel sprayed from the inner cylinder 2 is longer and the mixing is more thorough. The smaller the opening angle of the blades 3, the weaker the swirling intensity of the airflow. This allows for continuous adjustment of the swirling intensity of the airflow inside the annular airflow channel, adapting to various combustion conditions such as different fuel calorific values ​​and boiler loads, flexibly optimizing the air-fuel mixing effect, and reducing the amount of nitrogen oxides generated during the combustion process.

[0054] Example 2 To further explain the solution of the present invention, this embodiment will be used for explanation: like Figure 1-4 As shown, this invention provides an embodiment of a burner stabilizing hood. Specifically, the invention includes an outer cylinder 1 and an inner cylinder 2, which are coaxially arranged to form an annular airflow channel, providing space for the mixing of air and natural gas. Four blades 3 are evenly arranged circumferentially between the outer cylinder 1 and the inner cylinder 2, with the other side of the blades 3 fitting against the outer wall of the inner cylinder 2. These blades can rotate around the axis of the inner cylinder 2 during adjustment, changing the intensity of the airflow swirl and the mixing path.

[0055] The blade 3 is fixedly connected to an upper fixed shaft 401 and a lower fixed shaft 402 at its upper and lower ends respectively. The upper fixed shaft 401 is hinged to a first roller in the middle and passes through a second slide groove 601 at its end, which is fixedly connected to the connecting frame 7. The second slide groove 601 is provided through the rear side of the vertical part of the slide groove 6 to guide the movement of the upper fixed shaft 401. The lower fixed shaft 402 is hinged to a second roller at its end. The slide groove 6 has an L-shaped structure. Its vertical part is rolledly connected to the first roller, and its lower part is inclined downward and rolledly connected to the second roller. This design allows the blade 3 to achieve synchronous changes in opening and closing angles through the movement of the roller in different track slide grooves when it moves with the fixed shaft.

[0056] The lower side of the connecting frame 7 is fixedly connected to the movable seat 801 of the lead screw assembly 8. The lead screw assembly 8 is symmetrically arranged in two places on the inner cylinder 2 to ensure that the connecting frame 7 is evenly stressed and the adjustment process is smooth and without jamming. The lead screw assembly 8 is fixedly connected to the protective shell 9. The upper and lower ends of the protective shell 9 are connected to the side wall of the outer cylinder 1, which can protect the lead screw assembly from high temperature airflow and dust corrosion and extend the service life of the components.

[0057] The operating principle of this device is as follows: before the burner is run, the screw assembly 8 is started according to the fuel type, calorific value and combustion conditions. This drives the moving seat 801 to move up and down in the vertical direction. The moving seat 801 drives the connecting frame 7 to move synchronously, which in turn pulls the upper fixed shaft 401 of all blades 3 to move synchronously.

[0058] When the movable seat 801 moves the connecting frame 7 upward, the first roller of the upper fixed shaft 401 slides upward along the vertical part of the slide groove 6, and the second roller of the lower fixed shaft 402 slides synchronously along the inclined downward part of the slide groove 6. Due to the inclined guiding effect of the lower part of the slide groove 6, the blade 3 rotates around the axis of the inner cylinder 2, the opening and closing angle increases, the blade swirl intensity in the annular airflow channel increases, and the mixing path of air and natural gas is extended and the disturbance is enhanced when passing through the blade gap, so as to achieve full premixing. When the movable seat 801 moves the connecting frame 7 downward, the first roller slides down along the vertical part, and the second roller slides in the opposite direction along the inclined part. The opening and closing angle of the blade 3 decreases and the swirl intensity weakens, which is suitable for the working conditions of low-load combustion or low nitrogen emission.

[0059] After the blade 3 angle is adjusted to the correct position, the screw assembly 8 self-locks and fixes the position of the moving seat 801 to ensure that the blade angle remains stable. When the burner is running, natural gas is sprayed out through the inner cylinder 2, and air flows in along the annular channel between the outer cylinder 1 and the inner cylinder 2. Under the guidance and swirling action of the blade 3, the air and natural gas are evenly mixed and then enter the combustion chamber for combustion, which greatly improves the combustion efficiency and reduces the amount of nitrogen oxides generated.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A burner flame stabilizer cover, characterized in that, It includes an outer cylinder (1) and an inner cylinder (2) arranged coaxially, and a number of rotatable blades (3) are provided between the outer cylinder (1) and the inner cylinder (2). The blade (3) is fixed with a fixed shaft (4) at its upper and lower ends respectively, and each fixed shaft (4) is rotatably equipped with a roller at its end; the outer cylinder (1) has an L-shaped groove (6) on its side wall, and the roller is in rolling cooperation with the L-shaped groove (6); The outer cylinder (1) is provided with a connecting frame (7), and the upper fixed shaft (4) passes through the second slide groove (601) on the L-shaped slide groove (6) and is fixedly connected to the connecting frame (7); The connecting frame (7) is equipped with a lead screw assembly (8) for driving the connecting frame (7) to move vertically; the lead screw assembly (8) is fitted with a protective shell (9) on the outside, and the upper and lower ends of the protective shell (9) are fixedly connected to the side wall of the outer cylinder (1) respectively.

2. The burner flame stabilizer according to claim 1, characterized in that, The blades (3) are arranged evenly around the axis of the inner cylinder (2) in four pieces, and the inner side of the blades (3) is attached to the outer wall of the inner cylinder (2).

3. A burner flame stabilizer according to claim 1, characterized in that, The fixed shaft (4) is divided into an upper fixed shaft (401) and a lower fixed shaft (402). The upper fixed shaft (401) is fixed at the upper end of the blade (3), and the lower fixed shaft (402) is fixed at the lower end of the blade (3).

4. A burner flame stabilizer according to claim 1, characterized in that, The upper fixed shaft (401) is rotatably equipped with a first roller in the middle, and the lower fixed shaft (402) is rotatably equipped with a second roller at the end; the first roller is in rolling cooperation with the vertical section of the L-shaped slide groove (6), and the second roller is in rolling cooperation with the lower section of the L-shaped slide groove (6).

5. A burner flame stabilizer according to claim 1, characterized in that, The L-shaped groove (6) includes a vertical portion and an inclined portion extending from the lower end of the vertical portion.

6. A burner flame stabilizer according to claim 1, characterized in that, The second slide groove (601) is opened through the rear side of the vertical section of the L-shaped slide groove (6), and the upper fixed shaft (401) is slidably adapted to the second slide groove (601).

7. A burner flame stabilizer according to claim 1, characterized in that, The lead screw assembly (8) has two sets arranged symmetrically around the axis of the inner cylinder (2).

8. A burner flame stabilizer according to claim 1, characterized in that, The lead screw assembly (8) includes a movable seat (801), which is fixedly connected to the lower side of the connecting frame (7).

9. A burner flame stabilizer according to claim 1, characterized in that, The lead screw assembly (8) has a self-locking structure that can lock the vertical displacement position of the connecting frame (7).

10. A burner flame stabilizer according to claim 1, characterized in that, The outer cylinder (1) and the inner cylinder (2) form an annular airflow channel, and the blades (3) rotate to adjust the swirling intensity of the airflow in the annular airflow channel.

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