Combustion chamber structure

Abstract

The invention discloses a combustion chamber structure which comprises a box body, an output assembly and a heat exchanger, the output assembly and the heat exchanger are arranged in the box body, specifically, a combustion space, a heating space and a heat exchange space are formed in the box body, the combustion space is used for fuel combustion, and high-temperature airflow heated through combustion sequentially passes through the heating space and the heat exchange space; the output assembly is arranged in the heating space and used for outputting heat of the high-temperature airflow; the heat exchanger is arranged in the heat exchange space and comprises a shell and a heat pipe connected with the shell, a heat channel allowing high-temperature gas to pass through is formed in the shell, and the outer wall of the shell is fixedly connected with the inner wall of the box body. The combustion chamber and the heat exchanger are stably connected, and structural damage is not prone to occurring in the high-temperature working environment.

Description

Technical Field

[0001] The present invention relates to the field of heat exchangers, and in particular to a combustion chamber structure. Background Art

[0002] A heat exchanger is a component that recovers waste heat from equipment. It is usually located downstream of the combustion chamber or even at the very end of the entire equipment. A heat exchanger usually consists of two structures: a heat channel and a heat pipe. The high-temperature exhaust gas generated by the equipment flows through the hot channel and liquid is passed into the heat pipe. The liquid absorbs the heat in the high-temperature exhaust gas and heats up, thereby recovering the waste heat from the equipment.

[0003] However, due to the high operating temperature of the heat exchanger, the equipment it is equipped with has a certain amount of thermal expansion. As the number of equipment components and connection points increases, the risk of equipment deformation or even damage due to thermal expansion also increases accordingly. This is especially true at the connection between the hot duct and its upstream air duct, which often becomes a high-incidence area for equipment failure. Summary of the Invention

[0004] One object of the present invention is to provide a combustion chamber structure, which aims to solve the technical problem that the connection between the heat exchanger and its upstream air duct is easily damaged due to high temperature.

[0005] To achieve the above-mentioned purpose, the present invention provides a solution: a combustion chamber structure, which includes a box body and an output component and a heat exchanger arranged in the box body. Specifically, a combustion space, a heating space and a heat exchange space are formed in the box body. The combustion space is used for fuel combustion, and the high-temperature airflow heated by the combustion passes through the heating space and the heat exchange space in sequence; the output component is arranged in the heating space, and the output component is used to output the heat of the high-temperature airflow; the heat exchanger is arranged in the heat exchange space, and the heat exchanger includes a shell and a heat pipe connected to the shell. A heat channel for the high-temperature gas to pass through is formed in the shell, and the outer wall of the shell is fixedly connected to the inner wall of the box body.

[0006] In some embodiments of the present application, the box body includes a box shell and a weldment, the combustion space, heating space and heat exchange space are formed in the box shell, a fixing hole is opened on the box shell, the weldment is passed through the fixing hole and is physically connected to the box shell, the shell and the weldment are welded together, the box shell is made of aluminum alloy or stainless steel, and the weldment and the shell are both made of copper.

[0007] In some embodiments of the present application, a welding hole is formed on the weldment, and an opening direction of the welding hole is toward a side of the weldment away from the heat exchanger.

[0008] In some embodiments of the present application, the weldment is clamped with the box shell, and the weldment includes a first base and a through rod that are connected to each other. The first base abuts against the side of the box shell away from the heat exchanger. The through rod is provided with a fixing hole, and the end of the through rod away from the first base is welded to the shell.

[0009] In some embodiments of the present application, the diameter of the fixing hole is D1, the diameter of the welding hole is D2, 60%≤D2 / D1≤90%, and / or, the depth of the welding hole is L1, the length of the weldment in the thickness direction of the box shell is L2, 35%≤L1 / L2≤70%.

[0010] In some embodiments of the present application, the diameter of the fixing hole is D1, the outer diameter of the first base is D3, and 150%≤D3 / D1≤260%.

[0011] In some embodiments of the present application, the weldment is riveted to the box shell, and the weldment includes a bolt rod and a second base and a nail head connected to both ends of the bolt rod. The bolt rod is provided with a fixing hole, the second base abuts against the side of the box shell close to the heat exchanger, and the nail head is rolled and engaged with the side of the box shell away from the heat exchanger.

[0012] In some embodiments of the present application, the diameter of the fixing hole is D1, the outer diameter of the nail head is D4, and 150%≤D4 / D1≤260%.

[0013] In some embodiments of the present application, the shell includes an inner shell and a thin-walled shell, the edge of the thin-walled shell is connected to the inner shell, the heat channel is formed in the inner shell, and the box body is connected to the middle area of ​​the thin-walled shell.

[0014] In some embodiments of the present application, the thickness of the thin-walled shell is L3, the thickness of the inner shell is L4, the thickness of the box body is L5, L3 / L4≤30%, L3 / L5≤30%, L3≤1mm.

[0015] The beneficial effects of the present invention are: The casing contains a combustion space, a heating space, and a heat exchange space. The combustion space is used for fuel combustion, and the high-temperature airflow heated by the combustion passes through the heating space and the heat exchange space in sequence. The output component is located in the heating space and is used to output the heat of the high-temperature airflow. The heat exchanger is located in the heat exchange space and includes a shell and a heat pipe connected to the shell. The shell forms a heat channel for the high-temperature gas to pass through. The outer wall of the shell is fixedly connected to the inner wall of the casing. The heat exchanger and output component are directly located in the casing, that is, the output and recovery of heat energy are completed in one step within the combustion chamber structure, reducing the disadvantages of multiple components and air duct connections.

[0016] Compared with the prior art, the connection points of the present application are greatly reduced, reducing the structural weakness caused by high-temperature deformation and cracking. Moreover, compared with the technical solution of the prior art in which the components are connected through air ducts, the various structures of this embodiment are arranged in the box. Under the scenario of the same thermal expansion amount, because the various components of the present application can expand synchronously, the risk of dislocation is reduced, that is, the probability of structural cracking is reduced.

[0017] In addition, the output assembly and heat exchanger of the present application are directly arranged in the box body, which reduces heat loss and improves the utilization rate of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 1 is a schematic diagram of the overall structure of a combustion chamber structure provided by an embodiment of the present invention; Figure 2 It is along Figure 1 Schematic diagram of the cross section along line AA; Figure 3 Schematic diagram of the cooperation between the weldment and the box shell provided by an embodiment of the present invention; Figure 4 Schematic diagram of the cooperation between the weldment and the box shell provided by another embodiment of the present invention; Figure 5 This is a schematic diagram of the cooperation between the shell and the box provided by an embodiment of the present invention; Figure 6 yes Figure 5 A partial enlarged view of area B in the middle.

[0020] Description of Figure Numbers: 10. Box body; 11. Box shell; 111. Combustion space; 112. Heating space; 113. Heat exchange space; 114. Fixing hole; 12. Weldment; 121. Welding hole; 122. First base; 123. Through rod; 124. Bolt rod; 125. Second base; 126. Nail head; 20. Output assembly; 30. Heat exchanger; 31. Shell; 311. Inner shell; 312. Thin-walled shell; 32. Heat pipe; 33. Heat channel. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] Existing heat exchangers need to be connected to the downstream air outlet of the equipment through an air duct during assembly and use. At higher operating temperatures, the connections between the air duct and the equipment, and between the heat exchanger and the air duct, are easily damaged due to thermal expansion of the structure.

[0023] See also Figures 1 to 2 As shown, Figure 1 1 is a schematic diagram of the overall structure of a combustion chamber structure provided by an embodiment of the present invention; Figure 2 It is along Figure 1 Schematic diagram of the cross section along line AA.

[0024] In order to solve the technical problem that structural damage is prone to occur at the connection between the heat exchanger 30 and the equipment, an embodiment of the present invention discloses a combustion chamber structure, which includes a box body 10 and an output component 20 and a heat exchanger 30 arranged in the box body 10. Specifically: a combustion space 111, a heating space 112 and a heat exchange space 113 are formed in the box body 10, the combustion space 111 is used for fuel combustion, and the high-temperature airflow heated by combustion passes through the heating space 112 and the heat exchange space 113 in sequence; the output component 20 is arranged in the heating space 112, and the output component 20 is used to output the heat of the high-temperature airflow; the heat exchanger 30 is arranged in the heat exchange space 113, and the heat exchanger 30 includes a shell 31 and a heat pipe 32 connected to the shell 31, a heat channel 33 for high-temperature gas to pass through is formed in the shell 31, and the outer wall of the shell 31 is fixedly connected to the inner wall of the box body 10.

[0025] The outer wall of the shell 31 and the inner wall of the box body 10 can be connected in various ways, such as welding, bolt connection, and clamping.

[0026] In this embodiment, the heat exchanger 30 and the output component 20 are directly arranged in the box body 10, that is, the output and recovery of heat energy of the entire device are completed in the combustion chamber structure, reducing the disadvantages brought about by multiple components and air duct connections in the existing application of the heat exchanger 30.

[0027] Compared with the technical solution of the prior art in which the components are connected through air ducts, on the one hand, the connection points of the present application are greatly reduced, reducing the structural weaknesses caused by high-temperature deformation and cracking, and each structure is connected to the box body 10, and the structural strength of the connection points is also improved; on the other hand, the various structures of this embodiment are arranged in the box body 10, and the temperature conditions of each structure are similar, rather than the situation of upstream and downstream temperature decrease in the prior art. Under the scenario of the same thermal expansion amount, the various components of this embodiment can expand synchronously, and the risk of dislocation is reduced, that is, the probability of structural cracking is reduced.

[0028] In addition, the output assembly 20 and the heat exchanger 30 of the present application are directly disposed in the housing 10 , which reduces heat loss and improves heat utilization.

[0029] Please also refer to Figure 3 As shown, Figure 3 It is a schematic diagram of the cooperation between the weldment 12 and the box shell 11 provided in an embodiment of the present invention.

[0030] In some embodiments of the present application, the box body 10 includes a box shell 11 and a weldment 12, a combustion space 111, a heating space 112 and a heat exchange space 113 are formed in the box shell 11, a fixing hole 114 is opened on the box shell 11, the weldment 12 is physically connected to the box shell 11 through the fixing hole 114, the shell 31 is welded to the weldment 12, the box shell 11 is made of aluminum alloy or stainless steel, and the weldment 12 and the shell 31 are both made of copper.

[0031] For reasons of structural strength and thermal conductivity, the shell 31 of the heat exchanger 30 is typically constructed of a copper tube, or at least copper-plated, while the casing 11 is typically constructed of aluminum alloy or stainless steel. This results in different melting points and fluidity between the heat exchanger 30 and the casing 11, leading to poor weldability. Specifically, when the parent metal molten pool on one side of the heat exchanger 30 forms normally, the casing 11 is already overburned, whereas when the casing 11 is in normal melting condition, no molten pool has formed on the heat exchanger 30. Furthermore, when the heat exchanger 30 is relocated from the downstream side of the equipment to within the casing 10, its operating temperature rises. This causes the actual temperature of the weld between the heat exchanger 30 and the casing 10 to approach the melting point of the casing 11, posing a risk of connection failure between the heat exchanger 30 and the casing 10.

[0032] In this embodiment, the housing 10 includes a housing shell 11 and a weldment 12. The housing 10 and weldment 12 are physically connected. For example, the housing 10 and weldment 12 are snap-fitted, welded, sleeved, plugged, or bolted. This connection between the housing 10 and weldment 12 does not fail with increasing temperature. The heat exchanger 30 is connected to the housing 10 by welding the weldment 12 to the housing shell 31. Both are made of copper. Homogeneous welding provides excellent weldability and high weld strength. Furthermore, the melting point of copper is much higher than that of aluminum alloy. Therefore, there is little concern about weld failure due to temperature increases until the housing 10 is completely destroyed. In this embodiment, the housing 10 and heat exchanger 30 are stably connected.

[0033] Furthermore, a welding hole 121 is formed on the weldment 12 , and the opening direction of the welding hole 121 is toward the side of the weldment 12 away from the heat exchanger 30 .

[0034] Welding is a process in which a metal is melted and then solidified to achieve a fixed connection by heating, pressurizing, or both, with or without the addition of brazing filler metal. In this technical field, a common welding process involves applying an electric current to the parent metal at both ends of the weld. Because the resistance at the parent metal joint is high, the contacting surfaces of the parent metal are melted to form a molten pool, which then solidifies to form a weld. In the technical solution of this embodiment, an electric current is passed through the weldment 12 and the shell 31. The thickness of the weldment 12 and the shell 31 is positively correlated with the partial pressure between the two. That is, the thicker the weldment 12 and the shell 31, the worse the melting effect at the connection. Therefore, in this embodiment, a welding hole 121 is opened on the surface of the weldment 12 to allow the welder to penetrate. This reduces the thickness of the parent metal between the two welding electrodes, increases the partial pressure in the weld area, increases energy utilization, and optimizes weld performance, ensuring a sufficiently stable connection between the heat exchanger 30 and the housing 10 in the final combustion chamber structure.

[0035] Specifically, the diameter of the fixing hole 114 is D1, the diameter of the welding hole 121 is D2, 60%≤D2 / D1≤90%, and / or the depth of the welding hole 121 is L1, the length of the weldment 12 in the thickness direction of the box shell 11 is L2, 35%≤L1 / L2≤70%.

[0036] Optionally, the weldment 12 is clamped with the box shell 11, and the weldment 12 includes a first base 122 and a through rod 123 that are connected to each other. The first base 122 abuts against the side of the box shell 11 away from the heat exchanger 30, and the through rod 123 is penetrated by a fixing hole 114. The end of the through rod 123 away from the first base 122 is welded to the shell 31.

[0037] The weld 12 is snap-fitted to the casing 11. Specifically, the weld 12 is inserted into the fixing hole 114 from the side of the casing 11 away from the heat exchanger 30. The weld 12 may have an enlarged section at the end close to the heat exchanger 30 to abut against the surface of the casing 11 close to the heat exchanger 30, or the through rod 123 may be interference fit with the fixing hole 114, and the fixing hole 114 clamps the through rod 123 to fix the casing 11 and the weld 12.

[0038] Because the end of the through rod 123 away from the first base 122 is welded to the shell 31, when the heat exchanger 30 and the box body 10 tend to separate, the first base 122 of the weldment 12 is pulled by the through rod 123 and abuts against the side surface of the box body 11 away from the heat exchanger 30, thereby limiting the separation of the heat exchanger 30 and the box body 10.

[0039] Furthermore, the diameter of the fixing hole 114 is D1, the outer diameter of the first base 122 is D3, and 150%≤D3 / D1≤260%.

[0040] The size of the first base 122 is related to the connection strength between the weldment 12 and the box shell 11. The larger the first base 122 is, the more stable the connection between the weldment 12 and the box shell 11 is. When the weldment 12 and the box shell 11 tend to move, the pressure between the first base 122 and the box shell 11 is smaller, making it less likely for the box shell 11 or the weldment 12 to be torn.

[0041] Please also refer to Figure 4 As shown, Figure 4 It is a schematic diagram of the cooperation between the weldment 12 and the box shell 11 provided in another embodiment of the present invention.

[0042] In some embodiments of the present application, the weldment 12 is riveted to the box shell 11. The weldment 12 includes a bolt rod 124 and a second base 125 and a nail head 126 connected to both ends of the bolt rod 124. The bolt rod 124 is penetrated by a fixing hole 114. The second base 125 abuts against the side of the box shell 11 close to the heat exchanger 30, and the nail head 126 is rolled up and engaged with the side of the box shell 11 away from the heat exchanger 30.

[0043] Specifically, the diameter of the fixing hole 114 is D1, the outer diameter of the nail head 126 is D4, and 150%≤D4 / D1≤260%.

[0044] The riveted weldment 12 is simple to manufacture. The nail head 126 is formed by riveting and rolling it with a riveting machine after the bolt 124 passes through the fixing hole 114. Both ends of the weldment 12 can abut against the box shell 11 over a large area, resulting in a good connection effect and high production efficiency. The size of the nail head 126 is related to the connection strength of the weldment 12 and the box shell 11. The larger the nail head 126, the more stable the connection between the weldment 12 and the box shell 11. When the weldment 12 and the box shell 11 tend to move, the pressure between the nail head 126 and the box shell 11 is reduced, making the box shell 11 or the weldment 12 less likely to be torn.

[0045] Please also refer to Figures 5 and 6 As shown, Figure 5 Schematic diagram of the cooperation between the housing 31 and the box 10 provided in an embodiment of the present invention; Figure 6 yes Figure 5 A partial enlarged view of area B in the middle.

[0046] In some embodiments of the present application, the shell 31 includes an inner shell 311 and a thin-walled shell 312 , the edge of the thin-walled shell 312 is connected to the inner shell 311 , the heat channel 33 is formed in the inner shell 311 , and the box body 10 is connected to the middle area of ​​the thin-walled shell 312 .

[0047] Specifically, the thickness of the thin-walled shell 312 is L3, the thickness of the inner shell 311 is L4, the thickness of the box body 10 is L5, L3 / L4≤30%, L3 / L5≤30%, and L3≤1 mm.

[0048] Considering the significant temperature fluctuations in the combustion chamber's operating environment, relative deformation or displacement between the housing 10 and the heat exchanger 30 is possible. The inner shell 311 is connected to the housing 10 via a thin-walled shell 312. When there is significant relative movement between the heat exchanger 30 and the housing 10, the thin-walled shell 312 deforms or even breaks, preventing the inner shell 311 or the housing 10 from rupturing, thus providing a safety net. The parameter configuration of L3 / L4 ≤ 30%, L3 / L5 ≤ 30%, and L3 ≤ 1 mm helps limit deformation to the thin-walled shell 312.

[0049] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship and movement status of various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0050] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0051] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the design concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A combustion chamber structure, characterized in that: include: A box body, wherein a combustion space, a heating space and a heat exchange space are formed in the box body, wherein the combustion space is used for fuel combustion, and a high-temperature airflow heated by the combustion passes through the heating space and the heat exchange space in sequence; An output component, disposed in the heating space, and used to output the heat of the high-temperature airflow; A heat exchanger is arranged in the heat exchange space, and the heat exchanger includes a shell and a heat pipe connected to the shell. A heat channel for the high-temperature gas to pass through is formed in the shell, and the outer wall of the shell is fixedly connected to the inner wall of the box.

2. The combustion chamber structure according to claim 1, characterized in that: The box body includes a box shell and a weldment, the combustion space, the heating space and the heat exchange space are formed in the box shell, a fixing hole is provided on the box shell, the weldment passes through the fixing hole and is physically connected to the box shell, the shell and the weldment are welded together, the box shell is made of aluminum alloy or stainless steel, and the weldment and the shell are both made of copper.

3. The combustion chamber structure according to claim 2, characterized in that: A welding hole is formed on the welding piece, and an opening direction of the welding hole is toward a side of the welding piece away from the heat exchanger.

4. The combustion chamber structure according to claim 3, characterized in that: The weldment is clamped with the box shell, and the weldment includes a first base and a through rod that are connected to each other. The first base abuts against a side of the box shell away from the heat exchanger, the through rod passes through the fixing hole, and one end of the through rod away from the first base is welded to the shell.

5. The combustion chamber structure according to claim 3, characterized in that: The diameter of the fixing hole is D1, the diameter of the welding hole is D2, 60%≤D2 / D1≤90%, and / or The depth of the welding hole is L1, the length of the weldment in the thickness direction of the box shell is L2, and 35%≤L1 / L2≤70%.

6. The combustion chamber structure according to claim 4, characterized in that: The diameter of the fixing hole is D1, the outer diameter of the first base is D3, and 150%≤D3 / D1≤260%.

7. The combustion chamber structure according to claim 2, characterized in that: The weldment is riveted to the box shell, and the weldment includes a bolt rod and a second base and a nail head connected to both ends of the bolt rod. The bolt rod passes through the fixing hole, the second base abuts against a side of the box shell close to the heat exchanger, and the nail head rolls up and bites a side of the box shell away from the heat exchanger.

8. The combustion chamber structure according to claim 7, characterized in that: The diameter of the fixing hole is D1, the outer diameter of the nail head is D4, and 150%≤D4 / D1≤260%.

9. The combustion chamber structure according to any one of claims 1 to 8, characterized in that: The shell comprises an inner shell and a thin-walled shell, the edge of the thin-walled shell is connected to the inner shell, the heat channel is formed in the inner shell, and the box body is connected to the middle area of ​​the thin-walled shell.

10. The combustion chamber structure according to claim 7, characterized in that: The thickness of the thin-walled shell is L3, the thickness of the inner shell is L4, the thickness of the box body is L5, L3 / L4≤30%, L3 / L5≤30%, L3≤1mm.

Images