Combustion chamber head structure and combustion chamber

Abstract

The application discloses a combustion chamber head structure and a combustion chamber, and belongs to the technical field of gas turbine engines.The guide plate is divided into a guide part and a mounting part.The mounting part is connected to the pneumatic atomization device after penetrating through the mounting hole of the head of the flame tube, thereby avoiding high temperature in the welding process from causing deformation or defects of the flame tube, ensuring the air intake uniformity of the mounting holes at different positions on the flame tube, improving the uniformity of the temperature field in the flame tube, improving the temperature uniformity of the outlet end of the flame tube, and reducing the direct contact area between the guide plate and the flame tube, thereby reducing the heat conduction efficiency between the guide plate and the flame tube, and guiding cold air into the gap between the mounting part and the mounting hole, so as to cool the head of the mounting part and the flame tube.

Description

Technical Field

[0001] This invention relates to the field of gas turbine engine technology, specifically to a combustion chamber head structure and a combustion chamber. Background Technology

[0002] A gas turbine combustor assembly typically consists of a flame tube, a vortex generator assembly, and a guide plate. Usually, the vortex generator assembly and the guide plate are welded separately to the flame tube body, with their central axes collinear. The guide plate is first welded into the mounting hole in the flame tube body, and the vortex generator assembly is inserted into the guide plate and welded to the flame tube body. However, the existing technology has the following drawbacks:

[0003] The guide plate is directly welded into the mounting hole in the flame tube head. Due to the large heat-affected zone caused by welding, on the one hand, the guide plate will develop microcracks due to the large temperature gradient during welding, which reduces the thermal fatigue life of the guide plate; on the other hand, the large temperature gradient in the welded heat-affected zone causes deformation of the flame tube head. Since the deformation location and amount cannot be precisely controlled, the fitting clearance between the flame tube and the fuel nozzles at different positions will vary, which will affect the temperature field difference between different heads. As a result, the circumferential temperature distribution of the flame tube at the outlet position will be uneven, which will be detrimental to the life of the vortex guide.

[0004] When the flame tube is working, the guide plate is close to the combustion zone, resulting in a maximum wall temperature of up to 900°C. Due to the mounting holes welded to the guide plate at the flame tube head, the heat from the guide plate is transferred to the flame tube head through heat conduction. The temperature in the flame tube head area is higher closer to the guide plate. At the same time, the cooling air introduced into the flame tube through the cooling air holes at the flame tube head immediately moves downstream, resulting in weak cooling at the mounting holes at the flame tube head. This causes the temperature gradient in the flame tube head area to increase to 400°C (the wall temperature of the flame tube head is on the order of 500°C), leading to increased thermal stress at the flame tube head and reducing the thermal fatigue life of the flame tube head.

[0005] Based on this, the present invention designs a combustion chamber head structure and a combustion chamber to solve the above problems. Summary of the Invention

[0006] This invention provides a combustion chamber head structure and a combustion chamber to solve the technical problem in the prior art where welding the guide plate to the head of the flame tube causes defects or overheating in the flame tube head.

[0007] According to one aspect of the present invention, a combustion chamber head structure is provided, comprising a combustion chamber, a flame tube, a pneumatic atomizing device, and a guide plate; the flame tube is disposed within the combustion chamber, and a mounting hole is provided at the head of the flame tube; the pneumatic atomizing device is disposed at the head of the combustion chamber and extends to the head of the flame tube, the pneumatic atomizing device being used to mix fuel and air and then deliver the mixture into the flame tube through the mounting hole; the head of the flame tube is provided with a plurality of cold air holes, the cold air holes being used to introduce cold air between the combustion chamber and the flame tube into the flame tube; the guide plate includes a coaxially arranged mounting portion and a guide portion; the mounting portion is a cylindrical structure and is used to pass through the mounting hole; the first axially upward end of the mounting portion extends out of the flame tube and is connected to the pneumatic atomizing device. The second end of the mounting part extends into the flame tube and connects to the guide part. The shape of the guide part matches the head of the flame tube and is used to guide the flow of cold air entering the flame tube from the cold air hole. The outer diameter of the mounting part is smaller than the inner diameter of the mounting hole, and the mounting part and the mounting hole are coaxially arranged to form a gap between the mounting part and the mounting hole. A convex ring is provided on the side of the flame tube facing the pneumatic atomizing device. The convex ring surrounds the mounting hole and is used to abut against the pneumatic atomizing device. A first air intake hole is opened on the convex ring and penetrates the convex ring radially. The first air intake hole is used to introduce cold air between the flame tube and the combustion chamber into the gap between the mounting part and the mounting hole. The gap between the mounting part and the mounting hole is used to introduce cold air into the flame tube.

[0008] As a further embodiment of the present invention, the mounting part is slidably disposed on the pneumatic atomizing device along its axial direction, and the mounting part is provided with a limiting unit for limiting the position of the mounting part.

[0009] As a further embodiment of the present invention, the limiting unit includes a limiting ring, which is disposed at the first end of the mounting part in the axial direction. The outer diameter of the limiting ring is larger than the inner diameter of the mounting hole and is used to abut against the outer surface of the flame tube head to limit the maximum stroke of the mounting part sliding towards the inside of the flame tube.

[0010] As a further embodiment of the present invention, a limiting block is provided on the side wall of the limiting ring, and a limiting groove is formed on the convex ring. The limiting block is used to be inserted into the limiting groove to limit the angular orientation of the mounting part.

[0011] As a further embodiment of the present invention, a second air duct is provided on the limiting ring, the first end of the second air duct is disposed toward the first air duct, and the second end of the second air duct is disposed toward the gap between the mounting part and the mounting hole.

[0012] As a further embodiment of the present invention, an abutment ring is fixedly provided on the end face of the limiting ring facing the flame tube. The abutment ring is used to contact the flame tube, and the abutment ring has a second air duct extending from the outer surface of the abutment ring to the inner surface of the abutment ring along its own radial direction. The second air duct is used to introduce the cold air discharged from the first air duct into the gap formed between the mounting part and the mounting hole. The inner diameter of the abutment ring is larger than the diameter of the mounting hole, and the outer diameter of the abutment ring is not larger than the outer diameter of the limiting ring.

[0013] As a further aspect of the present invention, the difference between the outer diameter of the mounting part and the diameter of the mounting hole is not less than 4 mm.

[0014] As a further embodiment of the present invention, multiple first air inlets are provided on the convex ring, and the multiple first air inlets are arranged at equal intervals along the circumference of the convex ring.

[0015] As a further embodiment of the present invention, multiple second air inlets are provided, and the multiple second air inlets are arranged at equal intervals along the circumference of the mounting hole.

[0016] A combustion chamber, including the combustion chamber head structure described above.

[0017] The present invention has the following beneficial effects:

[0018] This invention divides the guide plate into a guide section and a mounting section. The mounting section passes through the mounting hole opened at the head of the flame tube and is connected to the pneumatic atomizing device. The guide section is used to guide the cold air entering the flame tube from the cold air hole. This eliminates the welding and fixing process between the guide plate and the flame tube, avoids deformation or defects of the flame tube caused by high temperature during the welding process, ensures the uniformity of air intake at different mounting holes on the flame tube, thereby improving the uniformity of the temperature field inside the flame tube and improving the temperature uniformity at the outlet end of the flame tube.

[0019] The outer diameter of the guide plate mounting part is smaller than the diameter of the mounting hole opened at the head of the flame tube, so that when the mounting part is inserted into the mounting hole, a gap will be formed between it and the mounting hole. This reduces the direct contact area between the guide plate and the flame tube, thereby reducing the heat transfer efficiency between the guide plate and the flame tube, reducing the heat transferred from the guide plate to the flame tube during operation, reducing the temperature at the head of the flame tube, reducing the temperature gradient between the mounting hole position and the cooling air hole position at the head of the flame tube, and thus increasing the thermal fatigue life of the flame tube.

[0020] The head of the flame tube is also equipped with a convex ring for abutting the pneumatic atomizing device. After the convex ring abuts the pneumatic atomizing device, a space is created between the pneumatic atomizing device and the end face of the flame tube facing the pneumatic atomizing device. The convex ring is also provided with a first air inlet hole that penetrates the convex ring radially. The first air inlet hole can guide cold air into the gap formed between the mounting part and the mounting hole, and enter the flame tube through the gap formed between the mounting part and the mounting hole. This stream of cold air cools the mounting part and the head of the flame tube, further reducing the temperature of the flame tube head and the mounting part on the guide plate, reducing the temperature gradient at the flame tube head, and further improving the thermal fatigue life of the flame tube and the guide plate. At the same time, the cold air passing through the mounting part and the mounting hole will eventually merge with the cold air entering from the cold air hole under the guidance of the guide part, and be used for the subsequent cooling of the inner surface of the flame tube, without wasting cold air.

[0021] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is an axial schematic diagram of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the flame tube and the guide plate in this invention;

[0026] Figure 4 This is a schematic diagram of the first example of the second air vent in this invention;

[0027] Figure 5 This is a second example schematic diagram of the second air vent in this invention;

[0028] Figure 6 This is a radial and axial schematic diagram of the abutment ring in this invention.

[0029] Legend:

[0030] 1. Combustion chamber; 2. Flame tube; 3. Pneumatic atomizing device; 4. Mounting hole; 5. Cooling air hole; 6. Mounting part; 7. Flow guide part; 8. Protruding ring; 9. First air intake hole; 10. Limiting ring; 11. Limiting block; 12. Limiting groove; 13. Second air intake hole; 14. Abutment ring. Detailed Implementation

[0031] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0032] Please see Figure 1-6 The present invention provides a technical solution: a combustion chamber head structure, including a combustion chamber 1, a flame tube 2, a pneumatic atomizing device 3, and a guide plate;

[0033] The flame tube 2 is located inside the combustion chamber 1, and the head of the flame tube 2 is provided with an installation hole 4. The pneumatic atomizing device 3 is located at the head of the combustion chamber 1 and extends to the head of the flame tube 2. The pneumatic atomizing device 3 is used to mix fuel and air and then send the mixture into the flame tube 2 through the installation hole 4. During operation, the atomizing device mixes air and fuel to generate a mixed gas, and then sends the mixed gas into the flame tube 2 for combustion.

[0034] The head of the flame tube 2 is provided with several cold air holes 5. The cold air holes 5 are used to introduce cold air between the combustion chamber 1 and the flame tube 2 into the flame tube 2. During the operation of the combustion chamber 1, there will be a pressure difference between the inside and outside of the flame tube 2. This pressure difference will drive the cold air outside the flame tube 2 to enter the flame tube 2 through the cold air holes 5, cool down the inner surface of the flame tube 2, thereby avoiding ablation of the inner surface of the flame tube 2 and increasing the thermal fatigue life of the flame tube 2.

[0035] The guide plate includes a coaxially arranged mounting part 6 and a guide part 7. The mounting part 6 is a cylindrical structure and is used to pass through the mounting hole 4. The first axial end of the mounting part 6 extends out of the flame tube 2 and connects to the pneumatic atomizing device 3. The second axial end of the mounting part 6 extends into the flame tube 2 and connects to the guide part 7. The shape of the guide part 7 matches the head of the flame tube and is used to guide the flow of cold air entering the flame tube 2 from the cold air hole 5. Figure 1 As shown, the shape of the guide section 7 matches the shape of the head of the flame tube 2, and is used to guide the flow of cold air entering the flame tube 2 from the cold air hole 5 at the head of the flame tube 2, so that the cold air moves close to the inner surface of the flame tube 2 and moves downstream of the flame tube 2, thereby cooling the inner surface of the flame tube 2 and improving the cooling effect of the cold air on the flame tube 2.

[0036] The guide plate is directly installed on the pneumatic atomizing device 3 through the mounting part 6. The connection body of the guide plate has changed. First, the guide plate does not need to be welded to the flame tube 2, which reduces the processing cost. At the same time, it can avoid the deformation and defects of the flame tube 2 caused by welding, and ensure that the multiple mounting holes 4 on the flame tube 2 have the same shape, thereby ensuring the uniformity of air intake of the flame tube 2, improving the uniformity of the temperature field, and improving the thermal fatigue life of the flame tube 2.

[0037] The outer diameter of the mounting part 6 is smaller than the inner diameter of the mounting hole 4, and the mounting part 6 is coaxially arranged with the mounting hole 4 to form a gap between the mounting part 6 and the mounting hole 4. This reduces the contact area between the guide plate and the flame tube 2, reduces the heat conduction efficiency between the guide plate and the flame tube 2, avoids the guide plate from conducting heat to the flame tube 2 in a large amount, reduces the temperature of the flame tube 2 head during operation, and further improves the thermal fatigue life of the flame tube 2.

[0038] A convex ring 8 is provided on the side of the flame tube 2 facing the pneumatic atomizing device 3. The convex ring 8 is arranged around the mounting hole 4 and is used to abut against the pneumatic atomizing device 3. A first air inlet 9 is provided on the convex ring 8, which is radially penetrating the convex ring 8. The first air inlet 9 is used to introduce cold air between the flame tube 2 and the combustion chamber 1 into the gap between the mounting part 6 and the mounting hole 4. The gap between the mounting part 6 and the mounting hole 4 is used to introduce cold air into the flame tube 2.

[0039] like Figure 1 As shown, a protruding ring 8 is provided on the side of the flame tube 2 facing the pneumatic atomizing device 3. The protruding ring 8 abuts against the output end of the pneumatic atomizing device 3, which avoids the pneumatic atomizing device 3 directly abutting against the head of the flame tube 2. A space is formed between the pneumatic atomizing device 3 and the head of the flame tube 2. This space connects the gap formed between the mounting part 6 and the mounting hole 4. At this time, a first air inlet 9 is opened on the protruding ring 8. The first air inlet 9 penetrates the protruding ring 8 in the radial direction. Through the first air inlet 9, cold air from outside the flame tube 2 can be introduced into the space formed between the pneumatic atomizing device 3 and the head of the flame tube 2. Then, it enters the mounting part 6 and the mounting hole 4 from this space. In the gap formed between the holes 4, the cold air that finally passes through the gap between the mounting part 6 and the mounting hole 4 and enters from the cold air hole 5 converges. The cold air outside the flame tube 2 is introduced into the space between the mounting part 6 and the mounting hole 4 through the first air duct 9, which cools the mounting part 6 and the head of the flame tube 2, further reducing the temperature of the head of the flame tube 2 and the mounting part 6 on the guide plate, and further improving the thermal fatigue life of the flame tube 2 and the guide plate. At the same time, the cold air that passes through the space between the mounting part 6 and the mounting hole 4 will eventually merge with the cold air entering from the cold air hole 5 under the guidance of the guide part 7, and be used for the subsequent cooling of the inner surface of the flame tube 2, without wasting the cold air.

[0040] This invention divides the guide plate into a guide section 7 and a mounting section 6. The mounting section 6 passes through the mounting hole 4 at the head of the flame tube 2 and is connected to the pneumatic atomizing device 3. The guide section 7 guides the cold air entering the flame tube 2 from the cold air hole 5. This eliminates the need for welding between the guide plate and the flame tube 2, avoiding deformation or defects in the flame tube 2 caused by high temperatures during welding. It also ensures the uniformity of air intake at different positions of the mounting hole 4 on the flame tube 2, thereby improving the uniformity of the temperature field inside the flame tube 2 and the temperature uniformity at the outlet end of the flame tube 2. At the same time, the outer diameter of the guide plate mounting section 6 is smaller than the diameter of the mounting hole 4 at the head of the flame tube 2, so that a gap is formed between the mounting section 6 and the mounting hole 4 when the mounting section 6 passes through the mounting hole 4. This reduces the direct contact area between the guide plate and the flame tube 2, thereby reducing the heat transfer efficiency between the guide plate and the flame tube 2, reducing the heat transferred from the guide plate to the flame tube 2 during operation, lowering the temperature at the head of the flame tube 2, and thus increasing the thermal fatigue life of the flame tube 2. The flame tube 2 is also equipped with a convex ring 8 for abutting against the pneumatic atomizing device 3. After the convex ring 8 abuts against the pneumatic atomizing device 3, a space is created between the pneumatic atomizing device 3 and the end face of the flame tube 2 facing the pneumatic atomizing device 3. The convex ring 8 is also provided with a first air inlet 9 that penetrates the convex ring 8 radially. The first air inlet 9 can guide cold air into the gap formed between the mounting part 6 and the mounting hole 4, and enter the flame tube 2 through the gap formed between the mounting part 6 and the mounting hole 4. This cold air cools the mounting part 6 and the head of the flame tube 2, further reducing the temperature of the head of the flame tube 2 and the mounting part 6 on the guide plate, reducing the temperature gradient at the head of the flame tube 2, and further improving the thermal fatigue life of the flame tube 2 and the guide plate. At the same time, the cold air passing through the mounting part 6 and the mounting hole 4 will eventually merge with the cold air entering from the cold air hole 5 under the guidance of the guide part 7, and be used for the subsequent cooling of the inner surface of the flame tube 2, without wasting cold air.

[0041] Specifically, the pneumatic atomizing device 3 is a conventional technical means in this field, and this application does not limit it, as long as it can form a gas mixture and send the gas mixture into the flame tube 2.

[0042] Furthermore, the mounting part 6 is slidably disposed on the pneumatic atomizing device 3 along its axial direction, and the mounting part 6 is provided with a limiting unit for limiting the position of the mounting part 6;

[0043] like Figure 1As shown, the end of the mounting part 6 extending out of the flame tube 2 is slidably mounted on the pneumatic atomizing device 3 along the axial direction of the mounting part 6, and the position of the mounting part 6 is limited by the limiting unit to ensure the position of the guide plate during operation. The mounting part 6 and the pneumatic atomizing device 3 do not need to be connected by welding, which can avoid the high temperature during welding causing deformation or defects in the pneumatic atomizing device 3. While connecting the guide ring through the pneumatic atomizing device 3, the impact on the pneumatic atomizing device 3 is reduced.

[0044] Specifically, the limiting unit includes a limiting ring 10, which is located at the first end of the mounting part 6 in the axial direction. The outer diameter of the limiting ring 10 is larger than the inner diameter of the mounting hole 4 and is used to abut against the outer surface of the head of the flame tube 2 to limit the maximum stroke of the mounting part 6 sliding towards the inside of the flame tube 2.

[0045] After the mounting part 6 is slidably mounted on the pneumatic atomizing device 3, the radial position of the mounting part 6 can be limited by the pneumatic atomizing device 3, thereby ensuring the radial position of the guide plate during use. The limiting unit includes a limiting ring 10, which is mounted on the first axial end of the mounting part 6. The first axial end of the mounting part 6 extends out of the flame tube 2 and is connected to the pneumatic atomizing device 3. After the limiting ring 10 is mounted on the first axial end of the mounting part 6, since the outer diameter of the limiting ring 10 is larger than the diameter of the mounting hole 4, the limiting ring 10 can abut against the outer surface of the head of the flame tube 2. The second axial end of the mounting part 6 is connected to the guide part 7, which is located inside the flame tube 2. The position of the mounting part 6 in its axial direction can be limited by the guide part 7 and the limiting ring 10, thus limiting the guide plate within a set range and increasing the stability of the guide plate during use.

[0046] At the same time, during the work process, such as Figure 1-2 As shown, the cold air entering the flame tube 2 from the cold air hole 5 will exert a leftward pressure on the guide section 7. This pressure will keep the guide plate at the leftmost position of its axial stroke, which can ensure that the gap between the guide section 7 and the inner surface of the flame tube 2 does not change, and ensure that the guide section 7 can stably guide the cold air entering the flame tube 2 from the cold air hole 5.

[0047] Furthermore, a limiting block 11 is provided on the side wall of the limiting ring 10, and a limiting groove 12 is provided on the convex ring 8. The limiting block 11 is used to be inserted into the limiting groove 12 to limit the angular orientation of the mounting part 6.

[0048] like Figure 2As shown, a limiting groove 12 is opened on the convex ring 8, and a limiting block 11 is fixedly set on the outer circumferential surface of the limiting ring 10. When installing the guide plate, the limiting block 11 on the limiting ring 10 is inserted into the limiting groove 12 opened on the soil block. The circumferential selection of the guide plate can be restricted by the cooperation between the limiting groove 12 and the limiting block 11, thereby positioning the angular position of the guide plate and preventing the guide plate from rotating during operation.

[0049] Furthermore, a second air duct 13 is provided on the limiting ring 10. The first end of the second air duct 13 is disposed toward the first air duct 9, and the second end of the second air duct 13 is disposed toward the gap between the mounting part 6 and the mounting hole 4.

[0050] like Figure 3-4 As shown, during operation, the cold air entering the flame tube 2 from the cold air hole 5 will push the guide plate to the left. This will cause the limiting ring 10 on the mounting part 6 to abut against the outer surface of the head of the flame tube 2. At this time, a second air duct 13 is opened on the limiting ring 10. The second air duct 13 can introduce the cold air discharged from the first air duct 9 into the gap between the mounting part 6 and the mounting hole 4, so as to avoid the limiting ring blocking the flow of air. At the same time, since the cold air discharged from the first air duct 9 will pass through the second air duct 13, the limiting ring 10 will be cooled when the cold air passes through the second air duct 13. Since the guide plate only contacts the flame tube 2 through the limiting ring 10 at this time, cooling the limiting ring 10 can reduce the heat conducted from the guide ring to the flame tube 2, thereby reducing the operating temperature of the flame tube 2.

[0051] Furthermore, a contact ring 14 is fixedly provided on the end face of the limiting ring 10 facing the flame tube 2. The contact ring 14 is used to contact the flame tube 2, and the contact ring 14 has a second air duct 13 extending from the outer surface of the contact ring 14 to the inner surface of the contact ring 14 along its own radial direction. The second air duct 13 is used to introduce the cold air discharged from the first air duct 9 into the gap formed between the mounting part 6 and the mounting hole 4. The inner diameter of the contact ring 14 is larger than the diameter of the mounting hole 4, and the outer diameter of the contact ring 14 is not larger than the outer diameter of the limiting ring 10.

[0052] like Figure 5-6 As shown, in some other examples, the end face of the limiting ring 10 facing the flame tube 2 is fixedly provided with an abutment ring 14. The abutment ring 14 is used to contact the flame tube 2. The limiting ring 10 no longer directly contacts the flame tube 2. When the guide plate moves to the leftmost end of its axial stroke, the abutment ring 14 will abut against the outer surface of the flame tube 2, so that a gap is formed between the limiting ring 10 and the outer surface of the head of the flame tube 2. The second air vent 13 is opened on the abutment ring 14 and passes through the abutment ring 14 radially. Similarly, the cold air discharged from the first air vent 9 is introduced into the gap between the mounting part 6 and the mounting hole 4 through the second air vent 13.

[0053] The inner diameter of the abutment ring 14 is larger than the diameter of the mounting hole 4, and the outer diameter of the abutment ring 14 is not larger than the diameter of the limiting ring 10. In other words, the contact area between the abutment ring 14 and the flame tube 2 is smaller than the contact area between the limiting ring 10 and the flame tube 2, thereby further reducing the heat transfer efficiency between the guide plate and the flame tube 2, while increasing the heat transfer path from the guide plate to the flame tube 2, and further reducing the temperature of the head of the flame tube 2.

[0054] Preferably, the difference between the outer diameter of the mounting part 6 and the diameter of the mounting hole 4 is not less than 4mm, so that the gap width formed between the mounting part 6 and the mounting hole 4 is not less than 2mm, leaving space for the thermal expansion of the guide plate during operation, and preventing the mounting part 6 of the guide plate from directly contacting the mounting hole 4 after thermal expansion.

[0055] Specifically, multiple first air intake holes 9 are provided on the convex ring 8, and these multiple first air intake holes 9 are arranged at equal intervals along the circumference of the convex ring 8. Multiple second air intake holes 13 are provided, and these multiple second air intake holes 13 are arranged at equal intervals along the circumference of the mounting hole 4. When cold air outside the flame tube 2 is introduced into the convex ring 8 through the first air intake holes 9, the cold air entering the convex ring 8 can be more evenly distributed in the circumference of the convex ring 8. At the same time, when cold air is introduced into the gap formed between the mounting part 6 and the mounting hole 4 through the second air intake holes 13, the cold air can also be more evenly distributed in the circumference of the mounting hole 4. This makes the final cold air distribution more even after entering the flame tube 2, thereby reducing the temperature difference at different positions on the inner surface of the flame tube 2, making the temperature on the inner surface of the flame tube 2 more uniform, and also making the temperature field inside the flame tube 2 more uniform.

[0056] A combustion chamber includes the aforementioned combustion chamber head structure. After using the aforementioned combustion chamber head structure, the temperature of the flame tube 2 head during the operation of the combustion chamber 1 can be significantly reduced, and the temperature distribution of the flame tube 2 head becomes more uniform, with the temperature gradient reduced to within 40°C per square centimeter. Its lifespan increases from 1000 hours to 3000 hours.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A combustion chamber head structure, comprising a combustion chamber (1), a flame tube (2), a pneumatic atomizing device (3), and a baffle plate; The flame tube (2) is located inside the combustion chamber (1), and the head of the flame tube (2) is provided with an installation hole (4). The pneumatic atomizing device (3) is located at the head of the combustion chamber (1) and extends to the head of the flame tube (2). The pneumatic atomizing device (3) is used to mix fuel and air and then send it into the flame tube (2) through the installation hole (4). The head of the flame tube (2) is provided with several cold air holes (5). The cold air holes (5) are used to introduce cold air between the combustion chamber (1) and the flame tube (2) into the flame tube (2). The flame tube (2) is characterized in that: The guide plate includes a mounting part (6) and a guide part (7) arranged coaxially. The mounting part (6) is a cylindrical structure and is used to pass through the mounting hole (4). The first end of the mounting part (6) extends out of the flame tube (2) and is connected to the pneumatic atomizing device (3). The second end of the mounting part (6) extends into the flame tube (2) and is connected to the guide part (7). The shape of the guide part (7) matches the head of the flame tube and is used to guide the flow of cold air entering the flame tube (2) from the cold air hole (5). The outer diameter of the mounting part (6) is smaller than the inner diameter of the mounting hole (4), and the mounting part (6) and the mounting hole (4) are coaxially arranged to form a gap between the mounting part (6) and the mounting hole (4); The flame tube (2) has a convex ring (8) on the side facing the pneumatic atomizing device (3). The convex ring (8) surrounds the mounting hole (4) and is used to abut against the pneumatic atomizing device (3). The convex ring (8) has a first air inlet (9) that passes through the convex ring (8) radially. The first air inlet (9) is used to introduce cold air between the flame tube (2) and the combustion chamber (1) into the gap between the mounting part (6) and the mounting hole (4). The gap between the mounting part (6) and the mounting hole (4) is used to introduce cold air into the flame tube (2). The mounting part (6) is slidably disposed on the pneumatic atomizing device (3) along its axial direction, and a limiting unit for limiting the position of the mounting part (6) is provided on the mounting part (6); The limiting unit includes a limiting ring (10), which is located at the first end of the mounting part (6) in the axial direction. The outer diameter of the limiting ring (10) is larger than the inner diameter of the mounting hole (4) and is used to abut against the outer surface of the head of the flame tube (2) to limit the maximum stroke of the mounting part (6) sliding towards the inside of the flame tube (2). The limiting ring (10) is provided with a second air inlet (13). The first end of the second air inlet (13) is set toward the first air inlet (9), and the second end of the second air inlet (13) is set toward the gap between the mounting part (6) and the mounting hole (4).

2. The combustion chamber head structure according to claim 1, characterized in that: A limiting block (11) is provided on the side wall of the limiting ring (10), and a limiting groove (12) is provided on the convex ring (8). The limiting block (11) is used to be inserted into the limiting groove (12) to limit the angular direction of the mounting part (6).

3. The combustion chamber head structure according to claim 1, characterized in that: The limiting ring (10) is fixedly provided with an abutment ring (14) on the end face facing the flame tube (2). The abutment ring (14) is used to contact the flame tube (2). The abutment ring (14) has a second air duct (13) that extends from the outer surface of the abutment ring (14) to the inner surface of the abutment ring (14) along its own radial direction. The second air duct (13) is used to introduce the cold air discharged from the first air duct (9) into the gap formed between the mounting part (6) and the mounting hole (4). The inner diameter of the abutment ring (14) is larger than the diameter of the mounting hole (4), and the outer diameter of the abutment ring (14) is not larger than the outer diameter of the limiting ring (10).

4. The combustion chamber head structure according to claim 1, characterized in that: The difference between the outer diameter of the mounting part (6) and the diameter of the mounting hole (4) is not less than 4 mm.

5. A combustion chamber head structure according to claim 1, characterized in that: The first air inlet (9) is provided in multiple ways on the convex ring (8), and the multiple first air inlet (9) are arranged at equal intervals along the circumference of the convex ring (8).

6. The combustion chamber head structure according to claim 1, characterized in that: The second air intake hole (13) has multiple openings, and the multiple second air intake holes (13) are arranged at equal intervals along the circumference of the mounting hole (4).

7. A combustion chamber, characterized in that: Includes the combustion chamber head structure as described in any one of claims 1-6.

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