Fuel burner with a needle and oil return

Abstract

This invention provides a fuel burner with a push pin and a return oil system, comprising an inlet pipe, a return oil pipe, an atomizing air pipe, a nozzle unit, and a central push pin unit. The return oil pipe, inlet pipe, and atomizing air pipe are coaxially mounted sequentially from the inside out. The nozzle unit includes a return oil device, a mixer, and a cap. The central push pin unit includes a push pin and a push pin drive mechanism. This invention achieves alternating closure of the sealable oil outlet and the sealable oil return through the reciprocating movement of the push pin, thereby automating the switching between combustion fuel supply and combustion shutdown fuel return. This eliminates the need for complex valve structures, simplifying the control logic. During combustion shutdown, the fuel inlet pipe is promptly returned via the return oil channel, completely solving the problem of residual fuel carbon buildup clogging the nozzle at high temperatures, ensuring the stability and reliability of the burner during subsequent operation.

Description

Technical Field

[0001] This invention relates to the field of fuel burner technology, specifically a fuel burner with a top pin and a return oil system. Background Technology

[0002] Existing fuel oil burners generally do not have a fuel oil return structure. If the burner does not disconnect the oil circuit in time and adjust the burner's state, the oil remaining at the burner nozzle will quickly generate carbon at high temperatures, clogging the nozzle and inevitably affecting the burner's normal operation next time. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a fuel burner with a top pin and a return oil.

[0004] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is: a fuel burner with a push pin and a return oil pipe, comprising an oil inlet pipe, an oil return pipe, an atomizing air pipe, a nozzle unit, and a central push pin unit. The return oil pipe, inlet oil pipe, and atomizing air pipe are coaxially sleeved together from the inside to the outside. The space between the inner wall of the atomizing air pipe and the outer wall of the inlet oil pipe is the atomizing air channel, the space between the inner wall of the inlet oil pipe and the outer wall of the return oil pipe is the inlet oil channel, and the inner cavity of the return oil pipe is the return oil channel. The nozzle unit includes an oil return device, a mixer, and a cap. The oil return device is installed at the head end of the oil inlet pipe and the oil return pipe. The oil return device has multiple first holes communicating with the oil inlet channel. The oil return device also has a sealable oil return hole communicating with the oil return channel. The mixer is located at the front end of the oil return device. The mixer has an air inlet communicating with the atomizing air channel. The bottom surface of the mixer has a sealable oil outlet hole in the middle. The mixer has an atomization space. Compressed air entering from the air inlet and fuel oil entering from the sealable oil outlet hole are atomized and mixed in the atomization space. The cap is placed on the mixer and connected to the head end of the atomizing air pipe. The cap has multiple atomized oil spray holes communicating with the atomization space. The central ejector pin unit includes an ejector pin and an ejector pin drive mechanism. The head of the ejector pin is provided with a first sealing part that matches the sealable oil outlet and a second sealing part that matches the sealable oil return. The ejector pin drive mechanism is used to drive the ejector pin to move axially back and forth. After the ejector pin moves forward, the first sealing part closes the sealable oil outlet, and the fuel oil in the oil inlet pipe flows back from the sealable oil return to the oil return pipe. After the ejector pin moves backward, the second sealing part closes the sealable oil return, and the fuel oil in the oil inlet pipe enters the atomization space of the mixer from the sealable oil outlet.

[0005] By adopting the technical solution of this invention, the reciprocating movement of the ejector pin achieves the alternating closure of the oil outlet and the oil return, thereby completing the automatic switching between combustion fuel supply and combustion shutdown oil return. This eliminates the need for additional complex valve structures and simplifies the control logic. When combustion stops, the fuel in the inlet pipe is promptly returned through the oil return channel, completely solving the problem of residual fuel carbon deposits clogging the nozzle at high temperatures in the prior art, ensuring the stability and reliability of the burner in the next operation.

[0006] Furthermore, the mixer includes a mixer base and an atomizing plate. The atomizing plate is located at the front end of the mixer base. The mixer base has an oil outlet buffer groove in the middle and an annular transition groove around the oil outlet buffer groove. The openings of the oil outlet buffer groove and the annular transition groove face the atomizing plate. The sealable oil outlet hole is located at the bottom center of the oil outlet buffer groove. The air inlet hole penetrates the outer wall of the annular transition groove. The atomizing plate has an annular groove, a swirling groove, and the atomizing space arranged radially from the outside to the inside. The bottom surface of the annular groove has multiple second holes communicating with the annular transition groove. Multiple swirling grooves extend tangentially from the annular groove to the atomizing space. The bottom center of the atomizing space has an oil outlet hole communicating with the oil outlet buffer groove.

[0007] Using the above-mentioned preferred scheme, the fuel outlet buffer groove of the mixer chassis can temporarily buffer the fuel flowing out of the sealable fuel outlet, preventing the fuel from directly impacting the atomization space and causing uneven mixing. At the same time, it plays a role in stabilizing pressure and ensuring the stability of fuel supply. The annular transition groove can circumferentially split the incoming compressed air, and together with the second hole of the annular groove on the atomizing plate, it can make the compressed air enter the annular groove evenly. The tangentially set swirl groove can make the compressed air form a rotating airflow, which forms a strong swirling mixture with the fuel in the atomization space, greatly improving the atomization mixing effect, making the fuel droplets finer and more uniform, further improving the combustion completeness and reducing pollutant emissions.

[0008] Furthermore, multiple atomizing oil spray holes are evenly distributed around the circumference of the cap, and the atomizing oil spray holes are oblique holes that gradually converge towards the center in the oil outlet direction.

[0009] Furthermore, the inner side of the cap is provided with an overflow groove above the atomization space. The inner wall of the overflow groove is tangent to the lower half of the atomizing oil spray hole. In the circumferential direction, the portion of the atomizing oil spray hole that is tangent to the overflow groove is less than half the circumference of the atomizing oil spray hole. The root of the atomizing oil spray hole extends to the opening of the annular groove. In the circumferential direction, the portion of the root of the atomizing oil spray hole at the opening of the annular groove is less than half the circumference of the atomizing oil spray hole.

[0010] By adopting the above-mentioned preferred scheme, a portion of the compressed air can be directly ejected through the oblique orifice, while the other portion participates in the atomization of fuel oil. This ensures precise guidance and convergence of the fuel mist ejected from each orifice, allowing the dispersed fuel mist to concentrate in the core combustion area. This significantly improves the aggregation of the fuel mist, increases its kinetic energy, and enables it to diffuse more accurately into the combustion zone. The center-converging structure also reduces the reverse scouring of the orifice outlet by high-temperature flue gas, reducing high-temperature losses in the orifice and extending the service life of the orifice and cap.

[0011] Furthermore, the head of the cap is a tapered structure that gradually tapers forward along the axial direction around the atomizing oil spray hole.

[0012] By adopting the above-mentioned preferred scheme, the conical structure can guide and converge the sprayed oil mist, concentrating it in the core combustion area and improving combustion efficiency. At the same time, the conical surface can reduce the retention of high-temperature flue gas at the head of the cap, reduce the high-temperature loss of the cap, and extend its service life. In addition, the conical structure can also optimize the airflow distribution at the front end of the burner and reduce the impact of airflow turbulence on combustion stability.

[0013] Furthermore, it also includes a burner body, wherein the oil return pipe, oil inlet pipe and atomizing air pipe are fixedly installed on the front end face of the burner body, and the burner body is provided with an atomizing air inlet communicating with the atomizing air channel, an oil inlet communicating with the oil inlet channel and an oil return port communicating with the oil return channel.

[0014] By adopting the above-mentioned preferred scheme, the burner body provides a stable installation carrier for each pipeline, ensuring the coaxiality and stability of the pipeline installation and avoiding leakage or loosening of connections caused by pipeline vibration during operation; the centralized atomizing air inlet, oil inlet and oil return inlet facilitate connection with external supply and recovery equipment, simplify the overall installation and pipeline layout of the burner, and improve the integration and practicality of the equipment.

[0015] Furthermore, the burner body is also provided with a compressed air inlet for controlling the action of the ejector pin and a pressure relief hole for venting and exhausting air. The burner body is also provided with a through hole that runs from front to back. The through hole is coaxially opposite to the oil return pipe. The burner body is provided with an installation chamber and a piston chamber at the rear end of the through hole. The ejector pin drive mechanism includes a central rod, a compression spring, a base plate, a front isolation plate, a venting plate, a rear isolation plate, and a piston; the ejector pin is connected to the front end of the central rod; the base plate, the front isolation plate, the venting plate, and the rear isolation plate are fixedly installed in the mounting chamber from front to back; the venting plate has a venting channel communicating from the inner hole side to the outer diameter side, and the pressure relief hole on the burner body communicates with the outer diameter side of the venting plate; a compression spring front stop is provided on the central rod at the front side of the burner body, and the compression spring is sleeved on the central rod, with the front of the compression spring... The end of the spring abuts against the front stop block of the compression spring, and the rear end of the compression spring abuts against the chassis; the piston is fixedly installed at the rear end of the center rod, the piston is installed in the piston chamber, and the compressed air inlet on the burner body is connected to the front part of the piston chamber; the rear part of the center rod, located in front of the piston, is provided with a front radial hole, a rear radial hole, and an intermediate axial hole connected between the front radial hole and the rear radial hole, which are spaced apart front and rear. When the piston is pushed to the rearmost axial position, the front radial hole is located behind the vent plate; After compressed air is introduced into the compressed air inlet, the compressed air enters the front part of the piston chamber, pushes the piston backward, and the piston drives the center rod to overcome the elastic force of the compression spring, thereby driving the second sealing part of the ejector pin to seal the oil return pipe. The front radial hole at the rear of the center rod is located behind the rear isolation plate. At this time, the sum of the elastic force of the compression spring and the counter-thrust force of the oil return device is balanced with the force of the compressed air, and the burner injects oil. When the burner needs to stop working, the compressed air is disconnected, the balance is broken, and under the elastic force of the compression spring, the compressed air in the piston chamber is compressed. The piston and the center rod move forward, and the front radial hole of the center rod moves forward to reach the circumference of the vent plate. The compressed air in the piston chamber passes through the rear radial hole, the intermediate axial hole, the front radial hole, and the vent plate of the center rod, and then is discharged through the pressure relief hole on the burner body. Finally, the ejector pin moves forward quickly until the first sealing part completely presses against the mixer, and the fuel oil flows back along the return oil pipe to maintain circulation.

[0016] The preferred design employs compressed air drive combined with spring reset to achieve the reciprocating movement of the ejector pin. This drive method is simple, reliable, and has a fast response, enabling rapid switching between oil supply and return. The front isolation plate, venting plate, and rear isolation plate ensure the sealing and separation of the installation chamber, preventing compressed air leakage and ensuring stable drive pressure. The venting plate's design, along with the radial and axial holes on the center rod, allows for the rapid discharge of compressed air from the piston chamber when combustion is stopped, ensuring smooth spring reset of the ejector pin and rapid opening of the oil return channel. The entire drive mechanism is integrated within the burner body, resulting in a compact structure that eliminates the need for additional large drive components, reducing equipment size and manufacturing costs.

[0017] Furthermore, both the front and rear isolation discs are provided with an inner sealing ring and an outer sealing ring. The inner ring of the inner sealing ring is in contact with the outer circumference of the center rod, and the outer ring of the outer sealing ring is in contact with the inner wall of the mounting chamber.

[0018] Furthermore, the rear port of the mounting chamber is provided with a stop hole with an inner diameter larger than that of the mounting chamber, and the rear end of the rear isolation plate is provided with a radially extending flange portion, which presses against the stepped surface between the stop hole and the mounting chamber.

[0019] By adopting the above-mentioned preferred scheme, the fit between the stop hole and the flange enables precise positioning and stable installation of the rear isolation plate. The supporting effect of the stepped surface can effectively withstand the axial force on the rear isolation plate, prevent the rear isolation plate from axial displacement during operation, ensure sealing performance and stability of the drive mechanism, and facilitate the assembly and disassembly of the rear isolation plate, thus improving maintenance convenience.

[0020] Furthermore, the burner body has an inner liner and a rear cover at the rear end. The front end of the inner liner is installed in the stop hole. The piston is located in the inner cavity of the inner liner. The rear cover presses against the inner liner and is fixedly connected to the burner body by screws.

[0021] With the above-mentioned preferred solution, the inner liner provides a dedicated movement cavity for the piston, avoiding direct contact and friction between the piston and the burner body, reducing wear, and facilitating separate maintenance of the piston movement area; the rear cover is fixed by screws to press and fix the inner liner, which is convenient for assembly and disassembly, and can ensure the stability of the inner liner installation, preventing the inner liner from shaking when the piston moves, and ensuring the stable operation of the drive mechanism.

[0022] Furthermore, the front end face of the inner liner presses against the rear end face of the flange of the rear isolation disc. The front end face of the inner liner is provided with a plurality of radially extending concave air inlet grooves. The outer periphery of the flange of the rear isolation disc and the outer periphery of the front part of the inner liner are provided with an annular air inlet space. The annular air inlet space is connected to the compressed air inlet of the burner body. The two ends of the air inlet groove are respectively connected to the annular air inlet space and the inner cavity of the front part of the inner liner.

[0023] By adopting the above-mentioned preferred scheme, the design of the annular air intake space and the radial air intake groove ensures that the compressed air entering from the compressed air inlet can be evenly distributed in the annular area, and then smoothly enter the inner cavity of the inner liner through the air intake groove to push the piston. This ensures that the piston is subjected to uniform driving force, avoids uneven wear or jamming of the piston due to uneven force, and improves the operational stability and service life of the drive mechanism.

[0024] Furthermore, a sealing element is provided between the inner wall of the rear cover and the outer peripheral wall of the inner liner, and an exhaust hole is provided on the rear cover that communicates with the rear cavity of the inner liner.

[0025] By adopting the above-mentioned preferred solution, the sealing performance between the rear cover and the inner liner is improved, preventing compressed air from leaking from the joint; the exhaust port of the rear cover can timely discharge the air in the rear cavity of the inner liner, preventing the internal air from forming back pressure that hinders the piston movement when the piston retracts, ensuring that the piston can smoothly retract to the designated position, and ensuring that the ejector pin can stably achieve the switching of oil supply status. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of one embodiment of the fuel burner of the present invention.

[0028] Figure 2 yes Figure 1 Enlarged view of a portion of point A in the middle.

[0029] Figure 3 This is a cross-sectional view of one embodiment of the fuel burner of the present invention.

[0030] Figure 4 yes Figure 3 Enlarged view of section B in the middle.

[0031] Figure 5 yes Figure 3 Enlarged view of a section at point C.

[0032] Figure 6 yes Figure 3 Enlarged view of a section at point D.

[0033] Figure 7 This is a three-dimensional schematic diagram of one embodiment of the central pin unit.

[0034] Figure 8 This is a schematic diagram of the front face of one embodiment of the cap.

[0035] Figure 9 This is a schematic diagram of the inside of one embodiment of the cap.

[0036] Figure 10 This is a structural schematic diagram of one embodiment of the atomizing plate.

[0037] Figure 11 This is a structural schematic diagram of one embodiment of the mixer chassis.

[0038] Figure 12 This is a structural diagram of one embodiment of the oil return device.

[0039] Figure 13 This is a structural diagram of one implementation of a thimble.

[0040] Figure 14 This is a schematic diagram showing the flow direction of atomized air and fuel oil when the burner's working pin retracts.

[0041] Figure 15 This is a schematic diagram showing the flow direction of atomized air and fuel oil when the burner shut-off pin is pushed forward.

[0042] The numbers and letters in the diagram represent the names of the corresponding components: 11-Oil inlet pipe; 12-Oil return pipe; 13-Atomizing air pipe; 14-Atomizing air channel; 15-Oil inlet channel; 16-Oil return channel; 30-Oil return device; 31-First orifice; 32-Sealable oil return hole; 40-Mixer; 41-Mixer base; 411-Air inlet; 412-Sealable oil outlet; 413-Oil outlet buffer groove; 414-Annular transition groove; 42-Atomizing plate; 421-Atomizing space; 422-Annular groove; 423-Swirl groove; 424-Second orifice; 425-Oil outlet small hole; 50-Cap; 51-Atomizing oil spray hole; 52-Overflow groove; 53-Conical structure; 61-Pin; 611-First sealing part; 612-Second sealing part; 62-Center rod; 621-Pressure spring front stop; 622-Front radial hole; 623-Rear radial hole; 624-Intermediate axial hole; 63-Compression spring; 64-Chassis; 65-Front isolation plate; 66-Vent plate; 661-Vent passage; 67-Rear isolation plate; 671-Flange; 68-Piston; 80-Burner body; 81-Atomizing air inlet; 82-Oil inlet; 83-Oil return port; 84-Compressed air inlet; 85-Pressure relief hole; 86-Through hole; 87-Mounting chamber; 88-Piston chamber; 89-Stove hole; 91-Inner liner; 911-Inlet groove; 912-Annular intake space; 92-Rear cover; 93-Screw; 94-Seal; 95-Exhaust port. Detailed Implementation

[0043] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] For ease of description of technical features, the directional descriptions of "front" and "rear" in this invention refer to the direction in which the burner flame is ejected.

[0045] like Figures 1-15As shown, one embodiment of the present invention is: a fuel burner with a nozzle and a return oil pipe, comprising an inlet pipe 11, a return oil pipe 12, an atomizing air pipe 13, a nozzle unit, and a central nozzle unit. The return oil pipe 12, the inlet oil pipe 11, and the atomizing air pipe 13 are coaxially installed from the inside to the outside. The space between the inner wall of the atomizing air pipe 13 and the outer wall of the inlet oil pipe 11 is the atomizing air channel 14. The space between the inner wall of the inlet oil pipe 11 and the outer wall of the return oil pipe 12 is the inlet oil channel 15. The inner cavity of the return oil pipe 12 is the return oil channel 16. The nozzle unit includes an oil return device 30, a mixer 40, and a cap 50. The oil return device 30 is installed at the head end of the oil inlet pipe 11 and the oil return pipe 12. The oil return device 12 is provided with a plurality of first holes 31 communicating with the oil inlet channel 15. The oil return device 12 is provided with a sealable oil return hole 32 communicating with the oil return channel 16. The mixer 40 is located at the front end of the oil return device 30. The mixer 40 is provided with an air inlet hole 411 communicating with the atomizing air channel 14. The bottom surface of the mixer 40 is provided with a sealable oil outlet hole 412. The mixer 40 is provided with an atomizing space 421. Compressed air entering from the air inlet hole 411 and fuel oil entering from the sealable oil outlet hole 412 are atomized and mixed in the atomizing space 421. The cap 50 is placed on the mixer 40 and connected to the head end of the atomizing air pipe 13. The cap 50 is provided with a plurality of atomizing oil spray holes 51 communicating with the atomizing space 421. The central ejector unit includes an ejector pin 61 and an ejector pin drive mechanism. The head of the ejector pin 61 is provided with a first sealing part 611 that matches the sealable oil outlet 412 and a second sealing part 612 that matches the sealable oil return hole 32. The ejector pin drive mechanism is used to drive the ejector pin 61 to move axially back and forth. Figure 14 , Figure 15 In the diagram, the red line indicates the flow direction of compressed air used for atomization, and the blue line indicates the flow direction of fuel oil. For example... Figure 15 In the indicated state, after the ejector pin 61 advances forward, the first sealing part 611 seals the sealable oil outlet 412, and the fuel oil in the oil inlet channel 15 flows back from the sealable oil return hole 32 to the oil return channel 16. Figure 14 As shown, after the ejector pin 61 retracts backward, the second sealing part 612 seals the sealable oil return hole 32, and the fuel oil in the oil inlet channel 15 enters the atomization space 421 of the mixer from the sealable oil outlet hole 412.

[0046] The beneficial effects of adopting the above technical solution are as follows: the reciprocating movement of the ejector pin enables the alternating closure of the oil outlet and the oil return, thereby completing the automatic switching between combustion fuel supply and combustion shutdown oil return, without the need for additional complex valve structures, simplifying the control logic; when combustion stops, the fuel in the inlet pipe is returned in time through the oil return channel, completely solving the problem of residual fuel carbon deposits clogging the nozzle at high temperatures in the existing technology, ensuring the stability and reliability of the burner in the next operation.

[0047] like Figure 4 , Figure 10 , Figure 11 As shown, in some other embodiments of the present invention, the mixer 40 includes a mixer base 41 and an atomizing plate 42. The atomizing plate 42 is located at the front end of the mixer base 41. The mixer base 41 is provided with an oil outlet buffer groove 413 located in the middle and an annular transition groove 414 located around the oil outlet buffer groove. The openings of the oil outlet buffer groove 413 and the annular transition groove 414 face the atomizing plate 42, and the oil outlet hole 412 can be closed. The oil outlet hole 412 is located at the center bottom of the oil outlet buffer groove 413. The air inlet 411 penetrates the outer wall of the annular transition groove 414; the atomizing plate 42 is radially arranged from the outside to the inside with an annular groove 422, a swirling groove 423 and an atomizing space 421. The bottom surface of the annular groove 422 is provided with a plurality of second holes 424 communicating with the annular transition groove 414. The plurality of swirling grooves 423 extend tangentially from the annular groove 422 to the atomizing space 421. The bottom center of the atomizing space 421 is provided with an oil outlet hole 425 communicating with the oil outlet buffer groove 413. The beneficial effects of adopting the above technical solution are as follows: The oil outlet buffer groove of the mixer chassis can temporarily buffer the fuel flowing out of the sealable oil outlet, preventing the fuel from directly impacting the atomization space and causing uneven mixing, while also playing a stabilizing role to ensure the stability of fuel supply; the annular transition groove can circumferentially split the incoming compressed air, and together with the second hole of the annular groove on the atomizing plate, it can make the compressed air enter the annular groove evenly; the tangentially set swirl groove can make the compressed air form a rotating airflow, forming a strong swirling mixture with the fuel in the atomization space, which greatly improves the atomization mixing effect, makes the fuel droplets finer and more uniform, further improves the completeness of combustion, and reduces pollutant emissions. When the burner needs to be shut down, after the pin cuts off the oil outlet, under the action of the swirling compressed air, the small amount of residual oil remaining in the nozzle unit can also be completely sucked out and burned off, preventing the nozzle unit from clogging.

[0048] like Figure 4 , Figure 8 , Figure 9 , Figure 14As shown, in some other embodiments of the present invention, a plurality of atomizing oil spray holes 51 are evenly distributed circumferentially on the cap 50. The atomizing oil spray holes 51 are oblique holes that gradually converge toward the center in the oil outlet direction. An overflow groove 52 is also provided on the inner side of the cap 50 above the atomizing space 421. The inner wall of the overflow groove 52 is tangent to the lower half of the atomizing oil spray hole 51. In the circumferential direction, the portion of the atomizing oil spray hole 51 that is tangent to the overflow groove 52 is less than half the circumference of the atomizing oil spray hole 51. The root of the atomizing oil spray hole 51 extends to the opening of the annular groove 422. In the circumferential direction, the portion of the root of the atomizing oil spray hole 51 located at the opening of the annular groove 422 is less than half the circumference of the atomizing oil spray hole 51. The beneficial effects of adopting the above technical solution are as follows: A portion of the compressed air can be directly ejected through the oblique orifice, while the other portion participates in the atomization of fuel oil. This ensures precise guidance and convergence of the fuel mist ejected from each orifice, allowing the dispersed fuel mist to concentrate in the core combustion area, significantly improving the agglomeration of the fuel mist, increasing the kinetic energy of the ejected fuel mist, and enabling the fuel mist to diffuse more accurately into the combustion zone. The center-converging structure also reduces the reverse scouring of the orifice outlet by high-temperature flue gas, reducing high-temperature loss in the orifice and extending the service life of the orifice and cap.

[0049] In other embodiments of the present invention, the head of the cap 50 is a conical structure 53 that gradually tapers forward along the axial direction around the atomizing oil spray hole 51. The beneficial effects of adopting the above technical solution are: the conical structure can guide and converge the sprayed oil mist, concentrating it in the core combustion area and improving combustion efficiency; simultaneously, the conical surface can reduce the retention of high-temperature flue gas at the head of the cap, reducing high-temperature loss of the cap and extending its service life; furthermore, the conical structure can optimize the airflow distribution at the front end of the burner, reducing the impact of airflow turbulence on combustion stability.

[0050] like Figure 2 , Figure 6 , Figure 7As shown, in some embodiments of the present invention, a burner body 80 is also included. A return oil pipe 12, an inlet oil pipe 11, and an atomizing air pipe 13 are fixedly installed on the front end face of the burner body 80. The burner body 80 is provided with an atomizing air inlet 81 communicating with an atomizing air channel 14, an oil inlet 82 communicating with an oil inlet channel 15, and an oil return port 83 communicating with a return oil channel 16. The atomizing air inlet 81 is connected to an external compressed air source via a pipeline. The oil inlet 82 is connected to the oil outlet of an external fuel oil supply device via a pipeline. The oil return port 83 is connected to the fuel tank of an external fuel oil supply device via a pipeline. The beneficial effects of adopting the above technical solution are: the burner body provides a stable mounting carrier for each pipeline, ensuring the coaxiality and stability of the pipeline installation, and avoiding leakage or loosening of connections caused by pipeline vibration during operation; the centralized atomizing air inlet, oil inlet, and oil return port facilitate connection with external supply and recovery equipment, simplifying the overall installation and pipeline layout of the burner, and improving the integration and practicality of the equipment.

[0051] like Figure 2 , Figure 6 , Figure 7 As shown, in some other embodiments of the present invention, the burner body 80 is further provided with a compressed air inlet 84 for controlling the action of the ejector pin and a pressure relief hole 85 for venting and exhausting. The burner body 80 is also provided with a through hole 86 that runs through the front and rear. The through hole 86 is coaxially opposite to the oil return pipe 12. The burner body 80 is provided with an installation chamber 87 and a piston chamber 88 at the rear end of the through hole 86. The ejector pin drive mechanism includes a central rod 62, a compression spring 63, a base 64, a front isolation plate 65, a venting plate 66, a rear isolation plate 67, and a piston 68; the ejector pin 61 is connected to the front end of the central rod 62; the base 64, the front isolation plate 65, the venting plate 66, and the rear isolation plate 67 are fixedly installed in the mounting chamber 87 from front to back; the venting plate 66 has a venting channel 661 that connects from the inner hole side to the outer diameter side, and the pressure relief hole 85 on the burner body 80 connects to the outer diameter side of the venting plate 66; a compression spring front stop 621 is provided on the central rod 62 at the front side of the burner body, and the compression spring 63 is sleeved on the central rod 62, pressing... The front end of the spring 63 abuts against the front stop block 621 of the compression spring, and the rear end of the compression spring 63 abuts against the chassis 64; the piston 68 is fixedly installed at the rear end of the center rod 62, and the piston 68 is axially movable in the piston chamber 88. The compressed air inlet 84 on the burner body 80 is connected to the front of the piston chamber 88; the rear part of the center rod 62 and the position in front of the piston 68 are provided with a front radial hole 622, a rear radial hole 623 and an intermediate axial hole 62 connecting the front radial hole and the rear radial hole. When the piston 68 is pushed to the rearmost axial position, the front radial hole 622 is located behind the venting plate 66. After an external compressed air source is introduced into the compressed air inlet 84, the compressed air enters the front of the piston chamber 88, pushing the piston 68 backward. The piston 68 drives the center rod 62 to overcome the elastic force of the compression spring 63, and then drives the second sealing part of the ejector pin 61 to seal the oil return pipe. The front radial hole 622 at the rear of the center rod 62 is located behind the rear isolation plate 67. At this time, the sum of the elastic force of the compression spring 63 and the counter-thrust force of the oil return device 30 is balanced with the force of the compressed air, and the burner injects oil. When the burner needs to stop working, the supply of external compressed air is disconnected, the balance is broken, and under the elastic force of the compression spring 63, the compressed air in the piston chamber 88 is compressed. The piston 68 and the center rod 62 move forward, and the front radial hole 622 of the center rod 62 moves forward to reach the inner circumference of the vent plate. The compressed air in the piston chamber 88 passes through the rear radial hole 623, the intermediate axial hole 624, the front radial hole 622, and the vent plate 66 of the center rod 62, and then is discharged through the pressure relief hole 85 on the burner body. Finally, the ejector pin 61 moves forward quickly until the first sealing part completely presses against the mixer, and the fuel oil flows back along the return oil pipe to maintain circulation. The beneficial effects of adopting the above technical solution are as follows: the reciprocating movement of the ejector pin is achieved by using compressed air drive combined with spring reset, which is simple, reliable, and has a fast response speed, enabling rapid switching between oil supply and return; the front isolation plate, venting plate, and rear isolation plate achieve sealing and separation of the installation chamber, preventing compressed air leakage and ensuring stable drive pressure; the matching design of the venting plate with the radial and axial holes on the center rod can quickly discharge the compressed air in the piston chamber when combustion stops, ensuring that the spring can smoothly push the ejector pin to reset and achieve rapid conduction of the oil return channel; the entire drive mechanism is integrated inside the burner body, with a compact structure, eliminating the need for additional large drive components, thus reducing equipment size and manufacturing costs.

[0052] like Figure 2 , Figure 6 , Figure 7 As shown, in some other embodiments of the present invention, both the front isolation disc 65 and the rear isolation disc 67 are provided with an inner sealing ring and an outer sealing ring. The inner ring of the inner sealing ring is in contact with the outer periphery of the center rod 62, and the outer ring of the outer sealing ring is in contact with the inner wall of the mounting chamber 87.

[0053] like Figure 2 , Figure 6 , Figure 7As shown, in some other embodiments of the present invention, the rear port of the mounting chamber 87 is provided with a stop hole 89 with an inner diameter larger than that of the mounting chamber, and the rear end of the rear isolation plate 67 is provided with a radially extending flange 671, which presses against the stepped surface between the stop hole 89 and the mounting chamber 87. The beneficial effects of adopting the above technical solution are: the cooperation between the stop hole and the flange enables precise positioning and stable installation of the rear isolation plate; the supporting effect of the stepped surface can effectively withstand the axial force on the rear isolation plate, preventing axial displacement of the rear isolation plate during operation, ensuring sealing performance and the stability of the drive mechanism; at the same time, this structure facilitates the assembly and disassembly of the rear isolation plate, improving maintenance convenience.

[0054] like Figure 2 , Figure 6 , Figure 7 As shown, in some other embodiments of the present invention, the burner body 80 has an inner liner 91 and a rear cover 92 at its rear end. The front end of the inner liner 91 is installed in the stop hole 89, the piston 68 is located in the inner cavity of the inner liner 91, and the rear cover 92 presses against the inner liner 91 and is fixedly connected to the burner body 80 by screws 93. The beneficial effects of adopting the above technical solution are: the inner liner provides a dedicated moving cavity for the piston, avoiding direct contact and friction between the piston and the burner body, reducing wear, and facilitating separate maintenance of the piston moving area; the rear cover is fixed by screws to press and fix the inner liner, which is convenient for assembly and disassembly, and can ensure the stability of the inner liner installation, preventing the inner liner from shaking when the piston moves, and ensuring the stable operation of the drive mechanism.

[0055] like Figure 2 , Figure 6 , Figure 7 As shown, in some embodiments of the present invention, the front end face of the inner liner 91 presses against the rear end face of the flange portion 671 of the rear isolation disc 67. Multiple radially extending, concave air inlet grooves 911 are provided on the front end face of the inner liner 91. A ring-shaped air inlet space 912 is provided around the flange portion 671 of the rear isolation disc 67 and the front periphery of the inner liner 91. The ring-shaped air inlet space 912 communicates with the compressed air inlet 84 of the burner body. The two ends of the air inlet grooves 911 communicate with the ring-shaped air inlet space 912 and the front inner cavity of the inner liner 91, respectively. The beneficial effect of adopting the above technical solution is that the coordinated design of the ring-shaped air inlet space and the radial air inlet grooves ensures that the compressed air entering from the compressed air inlet is evenly distributed in the ring area, and then smoothly enters the inner cavity of the inner liner through the air inlet grooves to push the piston. This ensures that the piston receives uniform driving force, avoids uneven wear or jamming of the piston due to uneven force, and improves the operational stability and service life of the drive mechanism.

[0056] In some embodiments of the present invention, a sealing element 94 is provided between the inner wall of the rear cover 92 and the outer peripheral wall of the inner liner 91, and an exhaust hole 95 communicating with the rear cavity of the inner liner is provided on the rear cover 92. The beneficial effects of adopting the above technical solution are: the sealing element improves the sealing performance between the rear cover and the inner liner, preventing compressed air from leaking from the joint; the exhaust hole of the rear cover can timely discharge the air in the rear cavity of the inner liner, preventing the internal air from forming back pressure that hinders the piston movement when the piston retracts, ensuring that the piston can smoothly retract to the designated position, and ensuring that the ejector pin can stably achieve the switching of the oil supply state.

[0057] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A fuel burner with a push pin and a return oil system, characterized in that, This includes the oil inlet pipe, oil return pipe, atomizing air pipe, nozzle unit, and center pin unit. The return oil pipe, inlet oil pipe, and atomizing air pipe are coaxially sleeved together from the inside to the outside. The space between the inner wall of the atomizing air pipe and the outer wall of the inlet oil pipe is the atomizing air channel, the space between the inner wall of the inlet oil pipe and the outer wall of the return oil pipe is the inlet oil channel, and the inner cavity of the return oil pipe is the return oil channel. The nozzle unit includes an oil return device, a mixer, and a cap. The oil return device is installed at the head end of the oil inlet pipe and the oil return pipe. The oil return device has multiple first holes communicating with the oil inlet channel. The oil return device also has a sealable oil return hole communicating with the oil return channel. The mixer is located at the front end of the oil return device. The mixer has an air inlet communicating with the atomizing air channel. The bottom surface of the mixer has a sealable oil outlet hole in the middle. The mixer has an atomization space. Compressed air entering from the air inlet and fuel oil entering from the sealable oil outlet hole are atomized and mixed in the atomization space. The cap is placed on the mixer and connected to the head end of the atomizing air pipe. The cap has multiple atomized oil spray holes communicating with the atomization space. The central ejector pin unit includes an ejector pin and an ejector pin drive mechanism. The head of the ejector pin is provided with a first sealing part that matches the sealable oil outlet and a second sealing part that matches the sealable oil return. The ejector pin drive mechanism is used to drive the ejector pin to move axially back and forth. After the ejector pin moves forward, the first sealing part closes the sealable oil outlet, and the fuel oil in the oil inlet pipe flows back from the sealable oil return to the oil return pipe. After the ejector pin moves backward, the second sealing part closes the sealable oil return, and the fuel oil in the oil inlet pipe enters the atomization space of the mixer from the sealable oil outlet.

2. The fuel burner with a push pin and oil return according to claim 1, characterized in that, The mixer includes a mixer base and an atomizing plate. The atomizing plate is located at the front end of the mixer base. The mixer base has an oil outlet buffer groove in the middle and an annular transition groove around the oil outlet buffer groove. The openings of the oil outlet buffer groove and the annular transition groove face the atomizing plate. The sealable oil outlet hole is located at the bottom center of the oil outlet buffer groove. The air inlet hole penetrates through the outer wall of the annular transition groove. The atomizing plate has an annular groove, a swirling groove, and the atomizing space arranged radially from the outside to the inside. The bottom surface of the annular groove has multiple second holes communicating with the annular transition groove. Multiple swirling grooves extend tangentially from the annular groove to the atomizing space. The bottom center of the atomizing space has an oil outlet hole communicating with the oil outlet buffer groove.

3. The fuel burner with a top pin and oil return according to claim 2, characterized in that, Multiple atomizing oil spray holes are evenly distributed around the circumference of the cap. The atomizing oil spray holes are oblique holes and gradually converge towards the center in the oil outlet direction.

4. The fuel burner with a push pin and oil return according to claim 3, characterized in that, The inner side of the cap, above the atomizing space, is also provided with an overflow groove. The inner wall of the overflow groove is tangent to the lower half of the atomizing oil spray hole. In the circumferential direction, the part of the atomizing oil spray hole that is tangent to the overflow groove is less than half the circumference of the atomizing oil spray hole. The root of the atomizing oil spray hole extends to the opening of the annular groove. In the circumferential direction, the part of the root of the atomizing oil spray hole at the opening of the annular groove is less than half the circumference of the atomizing oil spray hole.

5. The fuel burner with a push pin and oil return according to claim 1, characterized in that, It also includes a burner body, wherein the oil return pipe, oil inlet pipe and atomizing air pipe are fixedly installed on the front end face of the burner body, and the burner body is provided with an atomizing air inlet communicating with the atomizing air channel, an oil inlet communicating with the oil inlet channel and an oil return port communicating with the oil return channel.

6. The fuel burner with a push pin and oil return according to claim 5, characterized in that, The burner body is also provided with a compressed air inlet for controlling the action of the ejector pin and a pressure relief hole for venting and exhausting air. The burner body is also provided with a through hole that runs through the front and rear. The through hole is coaxial with the oil return pipe and is directly opposite to it. The burner body is provided with an installation chamber and a piston chamber at the rear end of the through hole. The ejector pin drive mechanism includes a central rod, a compression spring, a base plate, a front isolation plate, a venting plate, a rear isolation plate, and a piston; the ejector pin is connected to the front end of the central rod; the base plate, the front isolation plate, the venting plate, and the rear isolation plate are fixedly installed in the mounting chamber from front to back; the venting plate has a venting channel communicating from the inner hole side to the outer diameter side, and the pressure relief hole on the burner body communicates with the outer diameter side of the venting plate; a compression spring front stop is provided on the central rod at the front side of the burner body, and the compression spring is sleeved on the central rod, with the front of the compression spring... The end of the compression spring abuts against the front stop block, and the rear end of the compression spring abuts against the chassis; the piston is fixedly installed at the rear end of the center rod, the piston is installed in the piston chamber, and the compressed air inlet on the burner body is connected to the front part of the piston chamber; the rear part of the center rod, located in front of the piston, is provided with a front radial hole, a rear radial hole, and an intermediate axial hole connected between the front radial hole and the rear radial hole, which are spaced apart. When the piston is pushed to the rearmost axial position, the front radial hole is located behind the vent plate.

7. The fuel burner with a top pin and oil return according to claim 6, characterized in that, Both the front and rear isolation discs are equipped with inner and outer sealing rings. The inner ring of the inner sealing ring is in contact with the outer circumference of the center rod, and the outer ring of the outer sealing ring is in contact with the inner wall of the mounting chamber.

8. The fuel burner with a top pin and oil return according to claim 6, characterized in that, The rear port of the mounting chamber is provided with a stop hole with an inner diameter larger than that of the mounting chamber, and the rear end of the rear isolation plate is provided with a radially extending flange portion, which presses against the stepped surface between the stop hole and the mounting chamber.

9. The fuel burner with a top pin and oil return according to claim 8, characterized in that, The burner body has an inner liner and a rear cover at the rear end. The front end of the inner liner is installed in the stop hole. The piston is located in the inner cavity of the inner liner. The rear cover presses against the inner liner and is fixedly connected to the burner body by screws.

10. The fuel burner with a top pin and oil return according to claim 9, characterized in that, The front end face of the inner liner presses against the rear end face of the flange of the rear isolation plate. Multiple radially extending concave air inlet grooves are provided on the front end face of the inner liner. A ring-shaped air inlet space is provided around the flange of the rear isolation plate and around the front part of the inner liner. The ring-shaped air inlet space is connected to the compressed air inlet of the burner body. The two ends of the air inlet groove are connected to the ring-shaped air inlet space and the front inner cavity of the inner liner, respectively.

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