Burner lance, burner and asphalt mixing plant

Abstract

The present application belongs to the technical field of burners, and particularly relates to a burner lance, a burner and an asphalt mixing station. The burner lance comprises: a lance body provided with a mixing chamber, an air chamber and a spray hole; an atomization structure arranged at one end of the air chamber close to the mixing chamber, the atomization structure being provided with an atomization channel communicating the mixing chamber and the air chamber; and a fuel pipe assembly arranged in the lance body, one end of the fuel pipe assembly close to the atomization structure being in communication with the atomization channel, and an air gap being formed between the end of the fuel pipe assembly and the atomization structure; wherein at least part of the fuel pipe assembly is adapted to move relative to the lance body under the action of fuel pressure to adjust the size of the air gap. Through the technical scheme of the present application, the flow of compressed air can be adjusted by fuel pressure, the flow of compressed air is adaptively adjusted according to the size of the fuel flow, and the pressure of compressed air is kept constant, thereby reducing the influence on the atomization effect; meanwhile, the reliability of the overall structure is improved, which is conducive to reducing the cost.

Description

Technical Field

[0001] This invention belongs to the field of burner technology, specifically relating to burner spray guns, burners, and asphalt mixing plants. Background Technology

[0002] Currently, some burner nozzles used in asphalt mixing plants ignite and burn fuel by injecting an atomized mixture of fuel and compressed air. During operation, the fuel and air supply needs to be adjusted according to different operational requirements. To address this, some burner nozzles have improved their internal structure by using electric valves, controllers, and signal acquisition and output devices to regulate the atomization pressure, thereby adjusting the fuel flow rate based on changes in atomization pressure. However, in this approach, a smaller fuel injection volume results in a smaller atomization pressure, affecting the atomization effect. Furthermore, it requires additional electrical control equipment, increasing costs, and the system structure and connections become more complex, leading to poor reliability. Damage or malfunction of any component can render the burner nozzle unusable. Summary of the Invention

[0003] In view of this, in order to improve at least one of the above-mentioned problems existing in the prior art, the present invention provides a burner spray gun, a burner, and an asphalt mixing plant.

[0004] A first aspect of the present invention provides a burner nozzle, comprising: a nozzle body having a mixing chamber, an air chamber, and a nozzle orifice communicating with the outside; an atomizing structure disposed at one end of the air chamber near the mixing chamber, the atomizing structure having an atomizing channel communicating with the mixing chamber and the air chamber; and a fuel pipe assembly disposed in the nozzle body, the end of the fuel pipe assembly near the atomizing structure communicating with the atomizing channel, and an air gap forming between one end of the fuel pipe assembly and the atomizing structure, the air chamber communicating with the atomizing channel through the air gap; wherein at least a portion of the fuel pipe assembly is adapted to move relative to the nozzle body under fuel pressure to adjust the size of the air gap.

[0005] In one feasible implementation, a compression chamber is also provided at the end of the spray gun body away from the mixing chamber; the fuel pipe assembly includes: a guide pipe, one end of which is located in the compression chamber and connected to the spray gun body, and the other end of which extends into the air chamber; a movable pipe, which is movably sleeved on the guide pipe and adapted to move axially along the spray gun body, one end of which is disposed opposite to the atomizing structure, and the other end of which is provided with a first flange structure, which is located in the compression chamber and divides the compression chamber into a first sub-compression chamber and a second sub-compression chamber that are independent of each other; an elastic element, which is disposed in the second sub-compression chamber and abuts against the end face of the first flange structure; wherein, a first oil hole communicating with the first sub-compression chamber is provided on the side wall of the guide pipe.

[0006] In one feasible implementation, a second flange structure is provided at the end of the guide tube away from the mixing chamber. The second flange structure is detachably connected to the spray gun body. The second sub-compression chamber is located between the second flange structure and the first flange structure. A first partition structure is provided between the first sub-compression chamber and the air chamber, and the movable tube passes through the first partition structure.

[0007] In one feasible implementation, the end face where the nozzle is located is a conical surface, the nozzle includes multiple spray holes, and the multiple spray holes are spaced apart along the circumferential direction of the conical surface; wherein, the flow guiding structure is a conical tube structure adapted to the conical surface.

[0008] In one feasible implementation, the second flange structure is provided with a vent hole, and an air inlet / outlet cap is provided in the vent hole. The air inlet / outlet cap is adapted to exhaust air to the outside or to enter air into the second sub-compression chamber under the action of pressure difference. The two ends of the elastic element abut against the second flange structure and the first flange structure respectively. The side wall of the movable pipe is provided with a second oil hole that connects the first oil hole and the first sub-compression chamber.

[0009] In one feasible implementation, a first limiting boss is provided on the inner sidewall of the spray gun body. The first limiting boss is located in the first sub-compression chamber and is adapted to abut against the end of the first flange structure facing the first sub-compression chamber. A second limiting boss is provided on the outer sidewall of the guide tube. The second limiting boss is located in the second sub-compression chamber and is adapted to abut against the end of the first flange structure facing the second sub-compression chamber. In the axial direction of the spray gun body, the distance between the first limiting boss and the second limiting boss is a first dimension, and the axial dimension of the second oil hole is a second dimension, and the second dimension is greater than or equal to the first dimension.

[0010] In one feasible implementation, a first sealing ring is fitted onto the outer side of the first flange structure; a second sealing ring is fitted onto the outer side of the movable tube opposite to the first partition structure; and a third sealing ring is fitted onto the inner wall of the movable tube opposite to the guide tube. In another feasible implementation, the elastic element is a compression spring, fitted onto the guide tube; when the movable tube is in its initial position, the compression spring is in a partially compressed state.

[0011] In one feasible implementation, the end of the active tube near the atomizing structure is provided with an inclined tube section, the outer diameter of which gradually decreases in the direction of approaching the atomizing structure; the end of the atomizing structure facing the active tube is provided with a groove structure, the inner wall of which is set as an inclined surface structure adapted to the inclined tube section; wherein, an air gap is formed between the inclined surface structure and the outer surface of the inclined tube section.

[0012] In one feasible implementation, the end of the guide tube away from the mixing chamber is provided with an oil inlet, which is suitable for connecting to an oil supply line; the side wall of the spray gun body is provided with an air inlet at a position corresponding to the air chamber, which is suitable for connecting to an air supply line.

[0013] In one feasible implementation, the spray gun body includes: a first tube body, a mixing chamber located inside the first tube body, a spray hole provided on the end face of one end of the first tube body, and a first threaded interface provided at the other end of the first tube body; a second tube body, a second threaded interface provided at the end near the first tube body, and the second threaded interface and the first threaded interface forming a threaded connection.

[0014] In one feasible implementation, a second partition structure extending radially is provided inside the first tube, and a first threaded hole communicating with the mixing chamber is provided on the second partition structure. An atomizing structure is provided at one end of the second partition structure facing the air chamber, and a third threaded interface is provided on the outer wall of the end of the atomizing structure facing the mixing chamber. The atomizing structure forms a threaded connection with the first threaded hole through the third threaded interface.

[0015] A second aspect of the invention also provides a burner comprising: a burner nozzle as described in any of the preceding claims, for injecting a mixture of fuel oil and compressed air.

[0016] A third aspect of the present invention also provides an asphalt mixing plant, comprising: the burner described in any of the preceding claims.

[0017] The beneficial effects of this invention are reflected in:

[0018] By improving and optimizing the burner nozzle structure, the flow rate of compressed air can be adjusted by the fuel pressure, so that the flow rate of compressed air can be adaptively adjusted according to the fuel flow rate, and the pressure of compressed air can always remain constant, thereby reducing the impact on atomization effect. At the same time, there is no need to set up additional electronic control equipment to adjust the flow rate of compressed air, the overall reliability of the burner nozzle is higher, and it is also conducive to reducing costs. Attached Figure Description

[0019] Figure 1 The image shown is a cross-sectional view of a burner nozzle according to an embodiment of the present invention.

[0020] Figure 2 The image shown is a cross-sectional view of a burner nozzle according to an embodiment of the present invention.

[0021] Figure 3 The image shown is a cross-sectional view of a burner nozzle according to an embodiment of the present invention.

[0022] Figure 4 The image shown is a cross-sectional view of a burner nozzle according to an embodiment of the present invention.

[0023] Figure 5 The figure shown is a schematic block diagram of a burner provided in one embodiment of the present invention.

[0024] Figure 6The diagram shown is a schematic block diagram of an asphalt mixing plant according to an embodiment of the present invention.

[0025] Among them, Figures 2 to 4 In the diagram, solid arrows indicate the direction of fuel flow, while hollow arrows indicate the direction of compressed air flow. Detailed Implementation

[0026] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, top, bottom, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0027] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] 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. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Application Overview

[0030] A burner is a device that mixes fuel and air in a specific way and sprays the mixture through a nozzle for combustion. It is commonly used in various scenarios, such as asphalt mixing plants. Currently, some burner nozzles used in asphalt mixing plants require adjustments to the fuel and air supply during operation, depending on the specific operational needs. The burner nozzles utilize electric valves, controllers, and signal acquisition and output devices to regulate the atomization pressure, thereby adjusting the fuel flow rate by changing the atomization pressure.

[0031] Since the atomization pressure directly affects the fuel atomization effect, the aforementioned burner nozzle requires adjustments to the compressed air atomization pressure during operation. When the fuel injection volume is low, the corresponding atomization pressure is also low, inevitably affecting the atomization effect and leading to insufficient mixing of fuel and compressed air, thus impacting combustion. Furthermore, the burner nozzle requires additional electrical control equipment to manage the atomization pressure, increasing equipment costs and complicating the system structure and connections, resulting in lower reliability. Damage or malfunction of any component can render the burner nozzle unusable.

[0032] The following are some embodiments of the burner spray gun, burner, and asphalt mixing plant in the technical solution of the present invention.

[0033] In an embodiment of the first aspect of the invention, a burner nozzle 1 is provided, such as... Figure 1 As shown, the burner nozzle 1 includes a nozzle body 11, an atomizing structure 12, and a fuel line assembly 13. The nozzle body 11 serves as the main structure of the burner nozzle 1. The nozzle body 11 contains a mixing chamber 113 and an air chamber 114. The air chamber 114 supplies compressed air to the mixing chamber 113, which provides space for mixing fuel and compressed air. One end of the nozzle body 11 has a nozzle 1111 communicating with the mixing chamber 113 for injecting the fuel and compressed air mixture outwards. The atomizing structure 12 and the fuel line assembly 13 are located within the nozzle body 11. The atomizing structure 12 is located within the air chamber 114 near the mixing chamber 113. The atomizing structure 12 has an atomizing channel 121 that connects the mixing chamber 113 and the air chamber 114. One end of the fuel line assembly 13 near the atomizing structure 12 is connected to the atomizing channel 121 to supply fuel to the mixing chamber 113. An air gap 1141 is formed between the end of the fuel line assembly 13 facing the atomizing structure 12 and the atomizing structure 12. The air gap 1141 connects the air chamber 114 and the atomizing channel 121 so that the compressed air in the air chamber 114 can enter the atomizing channel 121 through the air gap 1141 to atomize the fuel and then enter the mixing chamber 113 through the atomizing channel 121 to further mix with the fuel.

[0034] At least a portion of the fuel line assembly 13 is adapted to move relative to the nozzle body 11 under fuel pressure, thereby changing the distance between the fuel line assembly 13 and the atomizing structure 12, and thus adjusting the size of the air gap 1141. When the fuel flow rate increases, the fuel pressure increases accordingly, causing the air gap 1141 between the fuel line assembly 13 and the atomizing structure 12 to increase accordingly, thereby increasing the compressed air flow rate; conversely, when the fuel flow rate decreases, the fuel pressure decreases accordingly, causing the air gap 1141 between the fuel line assembly 13 and the atomizing structure 12 to decrease accordingly, thereby decreasing the compressed air flow rate.

[0035] In this embodiment, the burner nozzle 1, through structural improvements and optimizations, can use fuel pressure to drive at least part of the fuel pipe assembly 13 to move, thereby adjusting the compressed air flow rate by changing the fuel flow rate. This achieves adaptive adjustment of the compressed air flow rate, and the atomization pressure of the compressed air remains unchanged during the adjustment process, effectively preventing the adjustment operation from affecting the atomization effect. At the same time, no additional electrical control equipment is required, resulting in stronger overall reliability of the burner nozzle 1. Furthermore, the overall structure and connection relationship are relatively simple, which is beneficial for controlling equipment costs.

[0036] In a further embodiment of the present invention, such as Figure 2 and Figure 3 As shown, the burner nozzle 1 also has a compression chamber 115 inside the nozzle body 11, and the compression chamber 115 is located at the end of the nozzle body 11 away from the mixing chamber 113. Correspondingly, the fuel pipe assembly 13 includes a nested guide pipe 131, a movable pipe 132, and an elastic element 133; one end of the guide pipe 131 is located in the compression chamber 115, and the other end is located in the air chamber 114, wherein the end of the guide pipe 131 located in the compression chamber 115 is connected to the nozzle body 11 to fix the guide pipe 131; the movable pipe 132 is movably sleeved on the guide pipe 131, and the movable pipe 132 can move relative to the guide pipe 131 along the axial direction of the nozzle body 11. One end is positioned opposite to the atomizing structure 12, allowing the guide tube 131 and the movable tube 132 to communicate with the atomizing channel 121 of the atomizing structure 12, thereby supplying fuel to the mixing chamber 113 through the guide tube 131 and the movable tube 132. The other end of the movable tube 132, away from the atomizing structure 12, is provided with a first flange structure 1321. The first flange structure 1321 abuts against the inner wall of the compression chamber 115, dividing the compression chamber 115 into two independent sub-compression chambers 1151 and 1152. The guide tube 131 has a first oil hole 1311 on its side wall, connecting to the first sub-compression chamber 1151. An elastic element 133 is located within the second sub-compression chamber 1152 and abuts against the end face of the first flange structure 1321.

[0037] During use, fuel in the guide pipe 131 can flow into the first sub-compression chamber 1151 through the first oil hole 1311. For example... Figure 2 As shown, in the initial state, the movable pipe 132 is located close to the atomizing structure 12, and the air gap 1141 is small; when the fuel flow rate increases, the fuel pressure in the first sub-compression chamber 1151 increases accordingly, pushing the first flange structure 1321 and the movable pipe 132 towards the second sub-compression chamber 1152, as shown. Figure 3As shown, this increases the air gap 1141 between the movable tube 132 and the atomizing structure 12, thereby increasing the flow rate of compressed air into the atomizing channel 121 and the mixing chamber 113. When the fuel flow rate decreases, the fuel pressure in the first sub-compression chamber 1151 decreases accordingly. Under the elastic force of the elastic element 133, the first flange structure 1321 moves towards the first sub-compression chamber 1151 and drives the movable tube 132 to move closer to the atomizing structure 12, thereby reducing the air gap 1141. Correspondingly, the flow rate of compressed air flowing from the air chamber 114 into the atomizing channel 121 and the mixing chamber 113 also decreases.

[0038] It should be noted that the number of first oil holes 1311 can be one or more. When multiple first oil holes 1311 are provided, the multiple first oil holes 1311 can be arranged at intervals along the circumference of the guide tube 131.

[0039] In this embodiment, the movable tube 132 acts as a piston, and the flow rate of compressed air can be adaptively changed according to the change of fuel flow rate by the movement of the movable tube 132. No additional electronic control equipment is required, which helps to simplify the structure and improve the reliability of the system.

[0040] In a further embodiment of the present invention, such as Figures 2 to 3 As shown, in the fuel pipe assembly 13, a second flange structure 1312 is provided at the end of the guide pipe 131 away from the mixing chamber 113. The second flange structure 1312 is detachably connected to the end of the spray gun body 11 (e.g., Figure 2 The guide tube 131 is connected to the spray gun body 11 as a whole by bolts (as shown in the diagram) to fix the guide tube 131. In the spray gun body 11, the space between the first flange structure 1321 and the second flange structure 1312 forms a second sub-compression chamber 1152, and correspondingly, the side of the first flange structure 1321 facing the air chamber 114 forms a first sub-compression chamber 1151. A first partition structure 1161 is provided between the first sub-compression chamber 1151 and the air chamber 114 to isolate the first sub-compression chamber 1151 and the air chamber 114 from each other; the movable tube 132 passes through the first partition structure 1161, and the first partition structure 1161 can support the movable tube 132. The first partition structure 1161 can be integrally formed with the inner wall of the spray gun body 11, or it can be a separate structure.

[0041] Furthermore, such as Figure 3As shown, the elastic element 133 abuts against the second flange structure 1312 and the first flange structure 1321 at both ends, respectively, so that when the first flange structure 1321 approaches the second flange structure 1312, the elastic element 133 is compressed, so that the elastic element 133 generates an elastic force to reset the first flange structure 1321 and the movable tube 132. A second oil hole 1322 is provided on the side wall of the movable tube 132 at a position opposite to the first oil hole 1311. The first oil hole 1311 communicates with the first sub-compression chamber 1151 through the second oil hole 1322. During the movement of the movable tube 132 relative to the guide tube 131, the second oil hole 1322 remains in communication with the first oil hole 1311 to ensure that fuel can smoothly enter and exit the first sub-compression chamber 1151 without obstruction. Correspondingly, the second flange structure 1312 is provided with a vent hole 1313, and an inlet / outlet cap 1314 is provided in the vent hole 1313. When the first flange structure 1321 moves closer to the second flange structure 1312, the volume of the second sub-compression chamber 1152 decreases, the air pressure increases, and the internal air is discharged outward through the inlet / outlet cap 1314. When the first flange structure 1321 moves away from the second flange structure 1312, the volume of the second sub-compression chamber 1152 increases, the air pressure decreases, and external air enters the second sub-compression chamber 1152 through the inlet / outlet cap 1314. By balancing the pressure difference between the inside and outside of the second sub-compression chamber 1152 through the inlet / outlet cap 1314, it can be ensured that the movable pipe 132 and the first flange structure 1321 are not affected by the air pressure changes in the second sub-compression chamber 1152 during movement, thus maintaining smooth movement.

[0042] It should be noted that the number of second oil holes 1322 is adapted to the number of first oil holes 1311, and there can be one or more of each. When multiple first oil holes 1311 and second oil holes 1322 are provided, the multiple first oil holes 1311 can be arranged at intervals along the circumference of the guide tube 131, and the multiple second oil holes 1322 can be arranged at intervals along the circumference of the movable tube 132, and correspond to the first oil holes 1311.

[0043] Furthermore, the burner nozzle 1 also has a limiting structure that matches the movable tube 132. For example... Figure 2 and Figure 3 As shown, the limiting structure includes a first limiting boss 1162 and a second limiting boss 1315; the first limiting boss 1162 is disposed on the inner side wall of the spray gun body 11 and located within the first sub-compression chamber 1151; the second limiting boss 1315 is disposed on the outer side wall of the guide tube 131 and located within the second sub-compression chamber 1152; the first limiting boss 1162 and the second limiting boss 1315 can respectively abut against both ends of the first flange structure 1321 to axially limit the movable tube 132. Figure 3In the example, the first flange structure 1321 is in abutting against the second limiting boss 1315. At this time, the movable tube 132 is located at the rightmost end of its travel, and the air gap 1141 between the movable tube 132 and the atomizing structure 12 is at its maximum. In the axial direction of the spray gun body 11, the distance between the first limiting boss 1162 and the second limiting boss 1315 is a first dimension L1, and the dimension of the second oil hole 1322 in this axial direction is a second dimension L2, which is greater than or equal to the first dimension L1, to adapt to the travel of the movable tube 132. This ensures that the first oil hole 1311 can maintain communication with the first sub-compression chamber 1151 through the second oil hole 1322, regardless of the position of the movable tube 132.

[0044] Furthermore, such as Figure 2 and Figure 3 As shown, in the burner nozzle 1, the guide tube 131 is provided with an oil inlet 1316. The oil inlet 1316 is located at the end of the guide tube 131 away from the mixing chamber 113. It can be connected to an external oil supply line through the oil inlet 1316 to supply fuel oil to the guide tube 131. Similarly, the nozzle body 11 is also provided with an air inlet 1142. The air inlet 1142 is located on the side wall of the nozzle body 11 at a position corresponding to the air chamber 114. It can be connected to an external air supply line through the air inlet 1142 to supply compressed air to the air chamber 114.

[0045] In a further embodiment of the present invention, a sealing ring may also be provided in the burner nozzle 1 for sealing the contact surface. For example... Figure 2 and Figure 4 As shown, a first sealing ring 1323 is provided on the outer surface of the first flange structure 1321. Specifically, an annular groove for fixing the first sealing ring 1323 can be provided on the outer surface of the first flange structure 1321. When the movable tube 132 moves relative to the guide tube 131, the first sealing ring 1323 seals the first flange structure 1321 and the spray gun body 11, thus isolating the first sub-compression chamber 1151 and the second sub-compression chamber 1152 from each other. Similarly, a second sealing ring 1324 is provided on the outer surface of the movable tube 132 at a position opposite to the first partition structure 1161. An annular groove for installing the second sealing ring 1324 can also be provided on the outer surface of the movable tube 132. When the movable tube 132 moves, the second sealing ring 1324 seals the air chamber 114 from each other, thus isolating the air chamber 114 from the first sub-compression chamber 1151. Similarly, a third sealing ring 1325 can also be provided on the inner wall of the movable tube 132, for example... Figure 4 In the example, a third sealing ring 1325 is provided on the front and rear sides of the second oil hole 1322 to prevent oil leakage between the first oil hole 1311 and the second oil hole 1322.

[0046] In a further embodiment of the present invention, such as Figure 2 and Figure 3 As shown, the elastic element 133 of the fuel pipe assembly 13 can specifically be a compression spring, which is sleeved on the guide pipe 131. One end of the compression spring abuts against the first flange structure 1321, and the other end abuts against the second flange structure 1312. When the movable pipe 132 is in its initial position, the compression spring is in a partially compressed state, meaning it has a certain compression deformation and generates a certain elastic force on the first flange structure 1321. This elastic force helps the movable pipe 132 to be at the leftmost end of its travel, minimizing the air gap 1141 between the movable pipe 132 and the atomizing structure 12. When the fuel pressure in the first sub-compression chamber 1151 exceeds the elastic force of the compression spring, a pressure difference is generated on both sides of the first flange structure 1321, causing the first flange structure 1321 to move the movable pipe 132 closer to the second flange structure 1312, thereby increasing the air gap 1141.

[0047] In a further embodiment of the present invention, such as Figure 2 and Figure 3 As shown, in the burner nozzle 1, the movable tube 132 has an inclined tube section 1327 at one end near the atomizing structure 12. The outer diameter of the inclined tube section 1327 gradually decreases in the direction near the atomizing structure 12, for example... Figure 2 The truncated cone structure is shown in the figure. Correspondingly, the atomizing structure 12 has a groove structure 122 at one end facing the movable tube 132, so that at least part of the inclined tube section 1327 can extend into the groove structure 122; wherein, the inner sidewall of the groove structure 122 is configured as an inclined surface structure adapted to the inclined tube section 1327, that is, the inner diameter of the groove structure 122 gradually increases in the direction close to the movable tube 132, so that an air gap 1141 is formed between the inner sidewall of the inclined surface structure of the groove structure 122 and the outer sidewall of the inclined tube section 1327, so that the compressed air in the air chamber 114 can enter the atomizing channel 121 along the air gap 1141 to atomize the fuel, and then enter the mixing chamber 113 to further mix with the fuel.

[0048] In a further embodiment of the present invention, such as Figure 1 and Figure 4As shown, the spray gun body 11 includes a first tube 111 and a second tube 112, which are detachably connected. A mixing chamber 113 is located within the first tube 111. A spray hole 1111 is provided on the end face of the first tube 111 away from the second tube 112. A first threaded interface 1112 is provided at the end of the first tube 111 closest to the second tube 112; correspondingly, a second threaded interface 1121 is provided at the end of the second tube 112 closest to the first tube 111, and the second threaded interface 1121 and the first threaded interface 1112 form a threaded connection, thereby achieving a detachable connection between the first tube 111 and the second tube 112. Specifically, as... Figure 4 In the example, the first threaded interface 1112 adopts an internal thread structure, and the second threaded interface 1121 adopts an external thread structure.

[0049] Furthermore, such as Figure 1 and Figure 4 As shown, a second baffle structure 1113 extending radially is also provided inside the first tube 111 to separate the mixing chamber 113 from the air chamber 114. The second baffle structure 1113 is provided with a first threaded hole 1114, and the first threaded hole 1114 is connected to the mixing chamber 113; correspondingly, a third threaded interface 123 is provided at one end of the atomizing structure 12 facing the mixing chamber 113. The third threaded interface 123 can specifically adopt the following... Figure 4 The external thread structure in the middle forms a threaded engagement with the first threaded hole 1114, so that the atomizing structure 12 and the second partition structure 1113 can be threadedly connected. The second partition structure 1113 can be, for example,... Figure 4 The structure shown is integrally formed with the first tube 111, but a split structure can also be adopted.

[0050] In addition, such as Figure 4 In the example, a third limiting boss 124 can also be provided on the outer wall of the atomizing structure 12. The third limiting boss 124 protrudes radially outward, and the end face of the third limiting boss 124 facing the second partition structure 1113 can abut against the end face of the second partition structure 1113 to axially limit the atomizing structure 12. During the assembly process, the third threaded interface 123 of the atomizing structure 12 is threadedly engaged with the first threaded hole 1114 of the second partition structure 1113. When the third threaded interface 123 is screwed in until the end face of the third limiting boss 124 abuts against the end face of the second partition structure 1113, the atomizing structure 12 reaches the target assembly position and restricts the third threaded interface 123 from continuing to screw into the first threaded hole, keeping the atomizing structure 12 in the current position and completing the assembly operation of the atomizing structure 12.

[0051] The following is a specific embodiment of the burner spray gun 1 of the present invention:

[0052] like Figures 1 to 4 As shown, the burner nozzle 1 includes a nozzle body 11, an atomizing structure 12, and a fuel line assembly 13.

[0053] like Figure 1 and Figure 4 As shown, the spray gun body 11 serves as the main structure of the burner spray gun 1, including a first tube 111 and a second tube 112. The end face of the first tube 111 away from the second tube 112 is provided with a spray hole 1111, and the end of the first tube 111 near the second tube 112 is provided with a first threaded interface 1112, which specifically adopts an internal thread structure. Correspondingly, the end of the second tube 112 near the first tube 111 is provided with a second threaded interface 1121, which specifically adopts an external thread structure. The second threaded interface 1121 and the first threaded interface 1112 form a threaded connection to achieve a detachable connection between the first tube 111 and the second tube 112.

[0054] like Figure 1 and Figure 4 As shown, a second baffle structure 1113 extending radially is provided inside the first tube 111. The second baffle structure 1113 is integrally formed with the inner wall of the first tube 111. The second baffle structure 1113 divides the internal space of the spray gun body 11 into a mixing chamber 113 and an air chamber 114. The mixing chamber 113 is located inside the first tube 111 away from the second tube 112, and the spray hole 1111 communicates with the mixing chamber 113. The second baffle structure 1113 is provided with a first threaded hole 1114, and the first threaded hole 1114 communicates with the mixing chamber 113. Correspondingly, a third threaded interface 123 is provided at one end of the atomizing structure 12 facing the mixing chamber 113. The third threaded interface 123 specifically adopts an external thread structure and forms a threaded engagement with the first threaded hole 1114, so that the atomizing structure 12 and the second baffle structure 1113 can be threadedly connected. A third limiting boss 124 is provided on the outer side wall of the atomizing structure 12. The end face of the third limiting boss 124 facing the second partition structure 1113 abuts against the end face of the second partition structure 1113 to axially limit the atomizing structure 12. The atomizing structure 12 is also provided with an atomizing channel 121 extending axially, and the atomizing channel 121 is connected to the mixing chamber 113.

[0055] like Figure 2 and Figure 3 As shown, the inner wall of the second tube 112 is provided with a first baffle structure 1161 extending radially, which divides the internal space of the second tube 112 into an air chamber 114 and a compression chamber 115. The air chamber 114 is located on the side of the first baffle structure 1161 facing the atomizing structure 12, and the compression chamber 115 is located on the side of the first baffle structure 1161 away from the atomizing structure 12.

[0056] The fuel line assembly 13 includes a nested guide tube 131, a movable tube 132, and an elastic element 133. One end of the guide tube 131 is located in the compression chamber 115, and the other end is located in the air chamber 114. A second flange structure 1312 is provided at the end of the guide tube 131 away from the mixing chamber 113. In the axial direction, the second flange structure 1312 extends beyond the second tube body 112 and is bolted to the end face of the second tube body 112 away from the first tube body 111, so that the guide tube 131 is connected to the spray gun body 11 as a whole. The second flange structure 1312 is provided with a vent hole 1313, and an intake / exhaust cap 1314 is provided in the vent hole 1313.

[0057] The movable tube 132 is movably fitted onto the guide tube 131 and passes through the first partition structure 1161. The movable tube 132 can move axially relative to the guide tube 131 along the spray gun body 11, and is supported by the first partition structure 1161. A first flange structure 1321 is provided at the end of the movable tube 132 away from the atomizing structure 12. The first flange structure 1321 abuts against the inner wall of the compression chamber 115, dividing the compression chamber 115 into two independent sub-compression chambers 1151 and 1152. The first sub-compression chamber 1151 is located on the side of the first flange structure 1321 facing the air chamber 114, and the second sub-compression chamber 1152 is located on the side of the first flange structure 1321 facing the second flange structure 1312. An inclined tube section 1327 is provided at the end of the movable tube 132 facing the atomizing structure 12. The outer diameter of the inclined tube section 1327 gradually decreases in the direction approaching the atomizing structure 12, for example... Figure 2 The diagram shows a truncated cone structure. Correspondingly, the atomizing structure 12 has a groove structure 122 at one end facing the movable tube 132. The inner wall of the groove structure 122 is configured as an inclined surface structure adapted to the inclined tube section 1327, meaning the inner diameter of the groove structure 122 gradually increases in the direction approaching the movable tube 132, allowing at least a portion of the inclined tube section 1327 to extend into the groove structure 122. An air gap 1141 is formed between the inner wall of the inclined surface structure of the groove structure 122 and the outer wall of the inclined tube section 1327, allowing compressed air in the air chamber 114 to enter the atomizing channel 121 along the air gap 1141 to atomize the fuel, and then enter the mixing chamber 113 to further mix with the fuel. The elastic element 133 is specifically a compression spring, which is sleeved on the guide tube 131, with one end abutting against the first flange structure 1321 and the other end abutting against the second flange structure 1312.

[0058] Among them, such as Figure 2 and Figure 3In the example, a first oil hole 1311 is provided on the side wall of the guide tube 131 at a position opposite to the first sub-compression chamber 1151, and a second oil hole 1322 is provided on the side wall of the movable tube 132 at a position opposite to the first oil hole 1311. The first oil hole 1311 communicates with the first sub-compression chamber 1151 through the second oil hole 1322, and the first oil hole 1311 remains in communication with the second oil hole 1322 and the first sub-compression chamber 1151 during the movement of the movable tube 132 relative to the guide tube 131; specifically, as shown in the example... Figure 3 In the example shown, there are multiple first oil holes 1311 and multiple second oil holes 1322. The multiple first oil holes 1311 are spaced apart circumferentially along the guide tube 131, and the multiple second oil holes 1322 are spaced apart circumferentially along the movable tube 132, corresponding one-to-one with the first oil holes 1311. In use, fuel in the guide tube 131 can flow into the first sub-compression chamber 1151 through the first oil holes 1311. An oil inlet port 1316 is provided at the end of the guide tube 131 away from the mixing chamber 113, which can be connected to an external fuel supply line to supply fuel to the guide tube 131. Similarly, an air inlet port 1142 is provided on the side wall of the second tube body 112 at a position corresponding to the air chamber 114, which can be connected to an external air supply line to supply compressed air to the air chamber 114.

[0059] like Figure 2 As shown, in the initial state, the compression spring is in a partially compressed state. At this time, the compression spring has a certain compression deformation and generates a certain elastic force on the first flange structure 1321, so that the movable tube 132 is at the leftmost end of its travel stroke. At this time, the air gap 1141 between the movable tube 132 and the atomizing structure 12 is at its minimum. When the fuel flow rate increases, when the fuel pressure in the first sub-compression chamber 1151 is greater than the elastic force of the compression spring, a pressure difference is generated on both sides of the first flange structure 1321, causing the first flange structure 1321 to drive the movable tube 132 to move closer to the second flange structure 1312, thereby increasing the air gap 1141. Figure 3 The state shown in the figure increases the flow rate of compressed air into the atomization channel 121 and the mixing chamber 113. When the fuel flow rate decreases, the fuel pressure in the first sub-compression chamber 1151 decreases accordingly, the first flange structure 1321 generates a reverse pressure difference, and moves towards the first sub-compression chamber 1151 under the action of the pressure difference, and drives the movable pipe 132 to move towards the atomization structure 12, so that the air gap 1141 decreases, and correspondingly, the flow rate of compressed air flowing from the air chamber 114 into the atomization channel 121 and the mixing chamber 113 also decreases.

[0060] Specifically, when the first flange structure 1321 moves closer to the second flange structure 1312, the volume of the second sub-compression chamber 1152 decreases, the air pressure increases, and the internal air is discharged outward through the inlet / outlet cap 1314. When the first flange structure 1321 moves away from the second flange structure 1312, the volume of the second sub-compression chamber 1152 increases, the air pressure decreases, and external air enters the second sub-compression chamber 1152 through the inlet / outlet cap 1314. By balancing the pressure difference between the inside and outside of the second sub-compression chamber 1152 through the inlet / outlet cap 1314, it can be ensured that the movable pipe 132 and the first flange structure 1321 are not affected by the air pressure changes in the second sub-compression chamber 1152 during movement, thus maintaining smooth movement.

[0061] like Figure 2 and Figure 3 As shown, a first limiting boss 1162 is provided on the inner wall of the second tube 112 at a position opposite to the first sub-compression chamber 1151, and a second limiting boss 1315 is provided on the outer wall of the guide tube 131 at a position corresponding to the second sub-compression chamber 1152; the first limiting boss 1162 and the second limiting boss 1315 can respectively abut against both ends of the first flange structure 1321 to axially limit the movable tube 132. Specifically, as Figure 3 In the example, the first flange structure 1321 is in abutting against the second limiting boss 1315. At this time, the movable tube 132 is located at the rightmost end of its travel, and the air gap 1141 between the movable tube 132 and the atomizing structure 12 is at its maximum. When the first flange structure 1321 is in abutting against the first limiting boss 1162, the movable tube 132 is located at the leftmost end of its travel, and the air gap 1141 is at its minimum. In the axial direction of the spray gun body 11, the distance between the first limiting boss 1162 and the second limiting boss 1315 is a first dimension L1, and the dimension of the second oil hole 1322 in this axial direction is a second dimension L2, which is greater than or equal to the first dimension L1, to adapt to the travel of the movable tube 132. This ensures that the first oil hole 1311 can maintain communication with the first sub-compression chamber 1151 through the second oil hole 1322, regardless of the position of the movable tube 132.

[0062] like Figure 2 and Figure 4As shown, an annular groove is provided on the outer surface of the first flange structure 1321, and a first sealing ring 1323 is provided in the annular groove. When the movable tube 132 moves relative to the guide tube 131, the first sealing ring 1323 seals the first flange structure 1321 and the spray gun body 11, thus isolating the first sub-compression chamber 1151 and the second sub-compression chamber 1152 from each other. Similarly, a second sealing ring 1324 is provided on the outer surface of the movable tube 132 opposite to the first partition structure 1161. An annular groove for installing the second sealing ring 1324 can also be provided on the outer surface of the movable tube 132, so that the second sealing ring 1324 seals the air chamber 114 from each other when the movable tube 132 moves. Similarly, a third sealing ring 1325 can also be provided on the inner wall of the movable tube 132, for example... Figure 4 In the example, a third sealing ring 1325 is provided on the front and rear sides of the second oil hole 1322 to prevent oil leakage between the first oil hole 1311 and the second oil hole 1322.

[0063] In this embodiment, the burner nozzle 1, through structural improvements and optimizations, can utilize fuel pressure to drive at least a portion of the fuel pipe assembly 13 to move, thereby adjusting the compressed air flow rate through changes in fuel flow rate. This achieves adaptive adjustment of the compressed air flow rate, while maintaining a constant atomization pressure during the adjustment process, effectively preventing the adjustment operation from affecting the atomization effect. Furthermore, without the need for additional electrical control equipment, the burner nozzle 1 exhibits enhanced overall reliability, and its simpler overall structure and connections facilitate cost control. Additionally, the multiple components of the burner nozzle 1 are connected via detachable connections, facilitating disassembly and assembly, as well as cleaning and maintenance of the internal structure.

[0064] A burner 2 is provided in a second aspect embodiment of the present invention, such as Figure 1 and Figure 5 As shown, the burner 2 includes the burner nozzle 1 in any of the embodiments of the first aspect described above, which atomizes and mixes fuel and compressed air, and sprays the atomized mixture of fuel and compressed air outward, thereby igniting the atomized mixture for combustion. When adjusting the fuel flow rate according to the needs of the combustion operation, the burner nozzle 1 can adaptively adjust the compressed air flow rate to match the fuel flow rate, and the compressed air always maintains the same atomization pressure to atomize and mix the fuel, thereby producing a good atomization effect.

[0065] Furthermore, depending on actual usage needs, the burner 2 may also include auxiliary devices such as a fuel supply device, a compressed air supply device, and an ignition device.

[0066] It should be noted that, depending on the application requirements, the burner 2 in this embodiment can be applied to asphalt mixing plants or other various application scenarios.

[0067] Furthermore, the burner 2 in this embodiment should also have all the beneficial effects of the burner nozzle 1 in any of the embodiments of the first aspect described above, which will not be repeated here.

[0068] An embodiment of the third aspect of the present invention provides an asphalt mixing plant 3, such as Figure 1 , Figure 5 and Figure 6 As shown, the asphalt mixing plant 3 includes the burner 2 in any of the above embodiments, so as to carry out combustion operations through the burner 2 according to the working requirements of the asphalt mixing plant 3. The asphalt mixing plant 3 in this embodiment has all the beneficial effects of the burner 2 in any of the above embodiments, which will not be repeated here.

[0069] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0070] The block diagrams of the devices, apparatuses, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it. It should also be noted that in the apparatuses and devices of this invention, the components can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the invention.

[0071] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0072] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features of the invention herein.

[0073] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A burner spray gun, characterized in that, include: The spray gun body (11) is provided with a mixing chamber (113), an air chamber (114) and a spray hole (1111) that communicates with the outside. Atomizing structure (12) is provided at one end of the air chamber (114) near the mixing chamber (113). The atomizing structure (12) is provided with an atomizing channel (121) connecting the mixing chamber (113) and the air chamber (114). A compression chamber (115) is also provided at one end of the spray gun body (11) away from the mixing chamber (113). A fuel pipe assembly (13) is disposed in the spray gun body (11). One end of the fuel pipe assembly (13) near the atomizing structure (12) is connected to the atomizing channel (121), and an air gap (1141) is formed between one end of the fuel pipe assembly (13) and the atomizing structure (12). The air chamber (114) is connected to the atomizing channel (121) through the air gap (1141). The fuel pipe assembly (13) includes: The guide tube (131) has one end located in the compression chamber (115) and connected to the spray gun body (11), and the other end of the guide tube (131) extends into the air chamber (114); The movable tube (132) is movably sleeved on the guide tube (131) and is adapted to move along the axial direction of the spray gun body (11). One end of the movable tube (132) is disposed opposite to the atomizing structure (12), and the other end of the movable tube (132) is provided with a first flange structure (1321). The first flange structure (1321) is located in the compression chamber (115) and divides the compression chamber (115) into a first sub-compression chamber (1151) and a second sub-compression chamber (1152) that are independent of each other. The side wall of the guide tube (131) is provided with a first oil hole (1311) that communicates with the first sub-compression chamber (1151). At least a portion of the fuel line assembly (13) is adapted to move relative to the nozzle body (11) under fuel pressure to adjust the size of the air gap (1141).

2. The burner nozzle according to claim 1, characterized in that, It also includes an elastic element (133) disposed in the second sub-compression chamber (1152) and abutting against the end face of the first flange structure (1321).

3. The burner nozzle according to claim 2, characterized in that, The guide tube (131) is provided with a second flange structure (1312) at one end away from the mixing chamber (113). The second flange structure (1312) is detachably connected to the spray gun body (11). The second sub-compression chamber (1152) is located between the second flange structure (1312) and the first flange structure (1321). A first partition structure (1161) is provided between the first sub-compression chamber (1151) and the air chamber (114), and the movable tube (132) passes through the first partition structure (1161).

4. The burner nozzle according to claim 3, characterized in that, The second flange structure (1312) is provided with a vent hole (1313), and an air inlet / outlet cap (1314) is provided in the vent hole (1313). The air inlet / outlet cap (1314) is adapted to exhaust air to the outside or to intake air into the second sub-compression chamber (1152) under the action of pressure difference. The two ends of the elastic element (133) abut against the second flange structure (1312) and the first flange structure (1321) respectively; The side wall of the active tube (132) is provided with a second oil hole (1322) that connects the first oil hole (1311) and the first sub-compression chamber (1151).

5. The burner nozzle according to claim 4, characterized in that, The inner wall of the spray gun body (11) is provided with a first limiting boss (1162). The first limiting boss (1162) is located in the first sub-compression chamber (1151) and is adapted to abut against the end of the first flange structure (1321) facing the first sub-compression chamber (1151). The guide tube (131) has a second limiting boss (1315) on its outer side wall. The second limiting boss (1315) is located in the second sub-compression chamber (1152) and is adapted to abut against the end of the first flange structure (1321) facing the second sub-compression chamber (1152). In the axial direction of the spray gun body (11), the distance between the first limiting boss (1162) and the second limiting boss (1315) is a first dimension, and the dimension of the second oil hole (1322) in the axial direction is a second dimension, and the second dimension is greater than or equal to the first dimension.

6. The burner nozzle according to claim 3, characterized in that, A first sealing ring (1323) is fitted on the outer side of the first flange structure (1321). A second sealing ring (1324) is fitted on the outer side of the movable tube (132) at a position opposite to the first partition structure (1161). A third sealing ring (1325) is provided on the inner wall of the movable tube (132) at a position opposite to the guide tube (131).

7. The burner nozzle according to any one of claims 2 to 6, characterized in that, The elastic element (133) is a compression spring and is sleeved on the guide tube (131); When the movable tube (132) is in the initial position, the compression spring is in a partially compressed state.

8. The burner nozzle according to any one of claims 2 to 6, characterized in that, The active tube (132) has an inclined tube section (1327) at one end near the atomizing structure (12), and the outer diameter of the inclined tube section (1327) gradually decreases in the direction near the atomizing structure (12). The atomizing structure (12) has a groove structure (122) at one end facing the movable tube (132), and the inner wall of the groove structure (122) is set as an inclined surface structure adapted to the inclined tube section (1327). The air gap (1141) is formed between the inclined structure and the outer surface of the inclined tube section (1327).

9. The burner nozzle according to any one of claims 2 to 6, characterized in that, The guide tube (131) has an oil inlet (1316) at one end away from the mixing chamber (113), which is suitable for connecting to the oil supply line; An air inlet (1142) is provided on the side wall of the spray gun body (11) at a position corresponding to the air chamber (114), which is suitable for connecting to the air supply pipeline.

10. The burner nozzle according to any one of claims 1 to 6, characterized in that, The spray gun body (11) includes: The first tube (111) has a mixing chamber (113) located inside the first tube (111). The spray hole (1111) is provided on the end face of one end of the first tube (111), and the first threaded interface (1112) is provided on the other end of the first tube (111). The second tube body (112) has a second threaded interface (1121) at one end near the first tube body (111), and the second threaded interface (1121) and the first threaded interface (1112) form a threaded connection.

11. The burner nozzle according to claim 10, characterized in that, The first tube (111) is provided with a second partition structure (1113) extending radially inside, and the second partition structure (1113) is provided with a first threaded hole (1114) communicating with the mixing chamber (113). The atomizing structure (12) is located at one end of the second partition structure (1113) facing the air chamber (114). A third threaded interface (123) is provided on the outer side wall of the end of the atomizing structure (12) facing the mixing chamber (113). The atomizing structure (12) is threadedly connected to the first threaded hole (1114) through the third threaded interface (123).

12. A burner, characterized in that, include: The burner nozzle as described in any one of claims 1 to 11 is used to inject a mixture of fuel and compressed air.

13. An asphalt mixing plant, characterized in that, include: The burner as described in claim 12.

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