A structural frame for supporting pulse current-assisted brazing heat exchanger tubes

Abstract

This invention proposes a structural frame for receiving pulsed current-assisted brazed heat exchanger tubes, comprising a truss top plate, an inner cylinder, connecting strips, circular connecting blocks, a truss bottom plate, and screws. Two circular connecting blocks are installed at the upper and lower ends of the inner cylinder and connected and fixed by welding. The truss bottom plate is fixed to the circular connecting block at the lower end of the inner cylinder by screws. Then, six heat exchanger tubes are installed sequentially, and six small blocks of the truss top plate are fixed to the circular connecting blocks at the upper end of the inner cylinder by screws. Finally, six connecting strips are installed and fixed directly below the edge of the truss top plate by screws, fixing the six small blocks of the truss top plate into a circular ring. The connecting strips are installed between adjacent small blocks of the truss top plate. This device can be adjusted according to the number of heat exchanger tubes to accommodate any number of heat exchanger tubes. The circular connecting blocks fix the spatial position of the heat exchanger tubes, increasing the stability of the pre-cooling heat exchanger. The hollow design reduces weight and improves the stability of the device.

Description

Technical Field

[0001] This invention provides a structural frame for receiving pulse current-assisted brazing heat exchanger tubes, suitable for the fixed assembly of high-temperature alloy capillary array microstructures, providing a stable fixed structure for strong pre-cooling heat exchangers, and belongs to the field of aerospace science and technology. Background Technology

[0002] The key technology enabling hypersonic vehicles to maintain high Mach numbers lies in the highly efficient precooler, which provides a favorable operating environment for the engine. A crucial component of the precooler in a highly precooled hypersonic flight propulsion system is a heat exchange tube array composed of thin-walled capillary tubes. Due to the large number of thin-walled capillary tubes and their susceptibility to deformation, ensuring the spatial fixation of the thin-walled capillary tube array units within the precooler according to a specific profile is a key focus in the development of this highly precooled hypersonic flight propulsion technology.

[0003] Based on the structural characteristics of the thin-walled capillary tubes in the precooler of a hypersonic flight propulsion system with strong precooling, a structural framework needs to be designed to support the pulsed current-assisted brazed heat exchanger array to ensure the spatial positioning of the thin-walled capillary array unit within the strong precooler. This device should also possess high stability and precise positioning. Currently, no structural device meets these requirements. This invention provides a structural framework for supporting pulsed current-assisted brazed heat exchanger arrays to solve the existing problems. Summary of the Invention

[0004] (1) Purpose

[0005] To ensure precise positioning of the thin-walled capillary array unit in the high-intensity precooler and to fix the workpiece to increase structural stability, a structural frame for supporting the pulsed current-assisted brazing heat exchanger tubes needs to be designed. This invention provides a structural frame for supporting the pulsed current-assisted brazing heat exchanger tubes and a fixture for fixing the heat exchanger tubes in the high-intensity precooler.

[0006] (2) Technical solution

[0007] The present invention provides a structural frame for supporting pulse current-assisted brazing heat exchanger tubes, the technical solution of which is as follows:

[0008] Figure 1This is an assembly drawing of a structural frame for receiving pulsed current-assisted brazed heat exchanger tubes. It mainly consists of a truss top plate 1, an inner cylinder 2, connecting strips 3, circular connecting blocks 4, a truss bottom plate 5, and screws 6, all made of GH4169 steel. The relationships between them are as follows: two circular connecting blocks 4 are installed at the upper and lower ends of the inner cylinder 2 and fixed by welding; the truss bottom plate 5 is fixed to the circular connecting blocks 4 at the lower end of the inner cylinder 2 by screws 6; then, six heat exchanger tubes are installed sequentially, and six small pieces of the truss top plate 1 are fixed to the circular connecting blocks 4 at the upper end of the inner cylinder 2 by screws 6; finally, six connecting strips 3 are installed and fixed directly below the edge of the truss top plate 1 by screws 6, fixing the six small pieces of the truss top plate 1 into a circular ring. The connecting strips 3 are installed between adjacent small pieces of the truss top plate 1. The number of small pieces of the truss top plate 1 is determined according to the number of heat exchanger tubes, and the number of circular connecting blocks 4 is determined according to the height of the heat exchanger tubes. The more heat exchanger tubes there are, the more parts there are in the truss top plate 1, the greater the height of the heat exchanger tubes, and the more circular connecting blocks 4 there are. Figure 2 This is the final assembly drawing after the heat exchanger tubes are installed.

[0009] The truss top plate 1, the specific structural form of which is described in [reference needed] Figure 3 It is made from a 0.5mm thick sheet material. The sheet material is first machined into a ring shape with an outer diameter of 274mm and an inner diameter of 145mm to meet installation requirements. Then, according to the position of the diodes on the heat exchanger tubes and the tube diameter, 10mm diameter holes are machined at equal intervals on the inner and outer rings of the ring (inner and outer ring diameters are 172mm and 251mm respectively). The outer ring holes are racetrack-shaped. The innermost and outermost edges of the inner and outer rings are... Figure 2 As shown in the diagram, drill 12 small holes, each 2.5mm in diameter, at equal intervals. Then, arrange the annular plate with the drilled holes according to... Figure 2 The structure is processed into six identical small blocks, each with the same size and openings. The purpose of dividing it into six equal blocks is to facilitate the installation of the heat exchanger pipes. The number of small blocks in the truss top plate 1 can be adjusted according to the number of heat exchanger pipes.

[0010] The inner cylinder 2 has a specific structural form, see [details omitted]. Figure 4 It is made from 0.5mm thick sheet metal. The sheet metal is pre-processed into the shape of an unfolded inner cylinder 2. Then, the pre-processed sheet metal is hollowed out according to the hollowed-out shape of the inner cylinder 2. The hollowed-out structure does not affect the structural load-bearing capacity, nor does it affect the airflow. Finally, according to the dimensions of the inner cylinder 2, the hollowed-out sheet metal is rolled into a cylindrical shape with an outer diameter of 146mm and a wall thickness of 0.5mm and connected by welding. The height of the inner cylinder 2 can be adjusted according to the height of the heat exchanger tubes.

[0011] The connecting strip 3 has the following specific structural form: Figure 5It is made from 2mm thick sheet metal. First, the sheet metal is processed into six narrow-sided fan-shaped strips according to the outer diameter of the truss top plate 1. The outer diameter of the fan-shaped strips is 274mm, the inner diameter is 261mm, and the fan angle is 60°. Then, according to... Figure 4 Two screw holes are machined as shown in the diagram, their size and position matching the screw holes on the outer ring of the truss top plate. A chamfer is machined below the outer side of the fan-shaped strip. Their main function is to connect and fix the two small sections of the truss top plate 1 via a connecting strip 3. The number of connecting strips 3 is the same as the number of small sections of the truss top plate 1.

[0012] The circular connecting block 4 has the following specific structural form: Figure 6 It is manufactured from a 1mm thick sheet material. First, the sheet material is machined into a ring shape according to the drawing requirements, with an inner diameter of 146mm. Then, raised features are machined according to the diode positions of the heat exchanger tubes. The main function is to fix the diode positions of the heat exchanger tubes and prevent them from shifting horizontally. Finally, screw holes are machined to mate with the truss top plate 1 and truss bottom plate 5, respectively. The number of circular connecting blocks is adjusted according to the height of the heat exchanger tubes.

[0013] The truss base plate 5, the specific structural form of which is described in [reference needed] Figure 7 It is made from a 1mm thick sheet material. The sheet material is first machined into a ring shape with an outer diameter of 274mm and an inner diameter of 145mm to meet installation requirements. Then, according to the position of the diodes on the heat exchanger tubes and the tube diameter, 10mm diameter holes are machined at equal intervals on the inner and outer rings of the ring (inner and outer ring diameters are 172mm and 251mm respectively). The outer ring hole is racetrack-shaped, and the innermost part of the inner ring is... Figure 6 As shown in the diagram, 12 small holes with a diameter of 2.5mm are machined at equal intervals for connecting the circular connecting block 4. The screw 6 is a standard M2.5x0.45 screw.

[0014] (3) Advantages and benefits

[0015] Based on the structural characteristics of the thin-walled capillary tube in the precooler of a high-intensity precooling hypersonic flight propulsion system, this invention provides a structural framework for receiving pulsed current-assisted brazing heat exchanger tubes. The main advantages are: 1. The device can be adjusted according to the number of heat exchanger tubes, accommodating any number of tubes; 2. The circular connecting block 4 of the device can fix the spatial position of the heat exchanger tubes, increasing the stability of the high-intensity precooling heat exchanger; 3. The inner cylinder 2 of the device adopts a hollow design, which reduces weight and improves the stability of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2This is the final assembly drawing after the heat exchanger tubes are installed.

[0018] Figure 3 This is a schematic diagram of the truss top plate structure.

[0019] Figure 4 This is a schematic diagram of the inner cylinder structure.

[0020] Figure 5 This is a schematic diagram of the connecting strip structure.

[0021] Figure 6 This is a schematic diagram of a circular connecting block structure.

[0022] Figure 7 This is a schematic diagram of the truss base plate structure.

[0023] The numbers and symbols in the diagram are explained as follows:

[0024] 1. Truss top plate; 2. Inner cylinder; 3. Connecting strip; 4. Circular connecting block; 5. Truss bottom plate; 6. Screws. Detailed Implementation

[0025] Please see Figures 1 to 7 As shown in the diagram, this invention relates to an assembly of a structural frame for receiving pulse current-assisted brazed heat exchanger tubes. It mainly consists of a truss top plate 1, an inner cylinder 2, connecting strips 3, circular connecting blocks 4, a truss bottom plate 5, and screws 6, all made of GH4169 steel. The relationships between them are as follows: two circular connecting blocks 4 are installed at the upper and lower ends of the inner cylinder 2 and fixed by welding; the truss bottom plate 5 is fixed to the circular connecting blocks 4 at the lower end of the inner cylinder 2 by screws 6; then, six heat exchanger tubes are installed sequentially, and six small pieces of the truss top plate 1 are fixed to the circular connecting blocks 4 at the upper end of the inner cylinder 2 by screws 6; finally, six connecting strips 3 are installed and fixed directly below the edge of the truss top plate 1 by screws 6, fixing the six small pieces of the truss top plate 1 into a circular ring. The connecting strips 3 are installed between adjacent small pieces of the truss top plate. The number of small pieces of the truss top plate 1 is determined according to the number of heat exchanger tubes, and the number of circular connecting blocks 4 is determined according to the height of the heat exchanger tubes. The more heat exchanger tubes there are, the more parts there are in the truss top plate 1, the greater the height of the heat exchanger tubes, and the more circular connecting blocks 4 there are. Figure 2 This is the final assembly drawing after the heat exchanger tubes are installed.

[0026] The truss top plate 1, the specific structural form of which is described in [reference needed] Figure 3It is made from a 0.5mm thick sheet material. The sheet material is first machined into a ring shape with an outer diameter of 274mm and an inner diameter of 145mm to meet installation requirements. Then, according to the position of the diodes on the heat exchanger tubes and the tube diameter, 10mm diameter holes are machined at equal intervals on the inner and outer rings of the ring (inner and outer ring diameters are 172mm and 251mm respectively). The outer ring holes are racetrack-shaped. The innermost and outermost edges of the inner and outer rings are... Figure 2 As shown in the diagram, drill 12 small holes, each 2.5mm in diameter, at equal intervals. Then, arrange the annular plate with the drilled holes according to... Figure 2 The structure is processed into six identical small blocks, each with the same size and openings. The purpose of dividing it into six equal blocks is to facilitate the installation of the heat exchanger pipes. The number of small blocks in the truss top plate 1 can be adjusted according to the number of heat exchanger pipes.

[0027] The inner cylinder 2 has a specific structural form, see [details omitted]. Figure 4 It is made from 0.5mm thick sheet metal. The sheet metal is pre-processed into the shape of an unfolded inner cylinder 2. Then, the pre-processed sheet metal is hollowed out according to the hollowed-out shape of the inner cylinder 2. The hollowed-out structure does not affect the structural load-bearing capacity, nor does it affect the airflow. Finally, according to the dimensions of the inner cylinder 2, the hollowed-out sheet metal is rolled into a cylindrical shape with an outer diameter of 146mm and a wall thickness of 0.5mm and connected by welding. The height of the inner cylinder 2 can be adjusted according to the height of the heat exchanger tubes.

[0028] The connecting strip 3 has the following specific structural form: Figure 5 It is made from 2mm thick sheet metal. First, the sheet metal is processed into six narrow-sided fan-shaped strips according to the outer diameter of the truss top plate 1. The outer diameter of the fan-shaped strips is 274mm, the inner diameter is 261mm, and the fan angle is 60°. Then, according to... Figure 4 Two screw holes are machined as shown in the diagram, their size and position matching the screw holes on the outer ring of the truss top plate. A chamfer is machined below the outer side of the fan-shaped strip. Their main function is to connect and fix the two small sections of the truss top plate 1 via a connecting strip 3. The number of connecting strips 3 is the same as the number of small sections of the truss top plate 1.

[0029] The circular connecting block 4 has the following specific structural form: Figure 6 It is manufactured from a 1mm thick sheet material. First, the sheet material is machined into a ring shape according to the drawing requirements, with an inner diameter of 146mm. Then, raised features are machined according to the diode positions of the heat exchanger tubes. The main function is to fix the diode positions of the heat exchanger tubes and prevent them from shifting horizontally. Finally, screw holes are machined to mate with the truss top plate 1 and truss bottom plate 5, respectively. The number of circular connecting blocks is adjusted according to the height of the heat exchanger tubes.

[0030] The truss base plate 5, the specific structural form of which is described in [reference needed] Figure 7It is made from a 1mm thick sheet material. The sheet material is first machined into a ring shape with an outer diameter of 274mm and an inner diameter of 145mm to meet installation requirements. Then, according to the position of the diodes on the heat exchanger tubes and the tube diameter, 10mm diameter holes are machined at equal intervals on the inner and outer rings of the ring (inner and outer ring diameters are 172mm and 251mm respectively). The outer ring hole is racetrack-shaped, and the innermost part of the inner ring is... Figure 6 As shown in the diagram, 12 small holes with a diameter of 2.5mm are machined at equal intervals for connecting the circular connecting block 4. The screw 6 is a standard M2.5x0.45 screw.

[0031] Once the frame and heat exchanger tubes are assembled, as follows: Figure 2 As shown, depending on the placement, the combination of the truss top plate 1, inner cylinder 2, and truss bottom plate 5 can serve as the load-bearing structure for the heat exchange pipes. Figure 2 The six innermost circular tubes are inlet diodes, and the six outermost circular tubes are outlet diodes. When the precooler is working, the cooling medium enters the heat exchange tubes through the inlet diodes and then flows out through the outlet diodes. The high-temperature airflow flows from the outside to the inside of the heat exchange tubes and then enters the engine through the inner channel. During the entire heat exchange process, the circular connecting block 4 constrains the horizontal degree of freedom of the inlet diodes to prevent them from shifting. When the thin-walled capillary expands due to the high-temperature airflow, the outlet diodes shift horizontally within the racetrack-shaped holes on the outer ring of the truss top plate 1 and the truss bottom plate 5 due to the constrained degree of freedom of the inlet diodes caused by the thermal expansion of the thin-walled capillary.

Claims

1. A structural frame for receiving pulse current-assisted brazing heat exchanger tubes, characterized in that: It consists of a truss top plate, an inner cylinder, connecting strips, circular connecting blocks, a truss bottom plate, and screws. Their relationship is as follows: two circular connecting blocks are installed at the upper and lower ends of the inner cylinder and fixed together by welding; the truss bottom plate is fixed to the circular connecting block at the lower end of the inner cylinder by screws; then, six heat exchange tubes are installed sequentially, and six small truss top plate pieces are fixed to the circular connecting blocks at the upper end of the inner cylinder by screws; finally, six connecting strips are installed and fixed directly below the edge of the truss top plate by screws, fixing the six small truss top plate pieces into a circular ring. The connecting strips are installed between adjacent truss top plates. The truss top plate is made of sheet metal. The sheet metal is processed into a ring shape, and circular holes are machined at equal intervals on the inner and outer rings of the ring plate according to the position of the diodes on the heat exchange tubes and the tube diameter. The circular holes on the outer ring are racetrack-shaped holes, and 12 small holes are machined at equal intervals on the innermost side of the inner ring and the outermost side of the outer ring. The ring-shaped sheet metal with the small holes is processed into six identical small blocks. The truss bottom plate is made of sheet metal. The sheet metal is processed into a ring shape, and circular holes are machined at equal intervals on the inner and outer rings of the ring plate according to the position of the diodes on the heat exchange tubes and the tube diameter.

2. The structural frame for receiving pulse current-assisted brazing heat exchanger tubes according to claim 1, characterized in that: Each small block is the same size and has the same opening. The six small blocks are divided into six blocks to facilitate the installation of heat exchanger pipes. The number of small blocks in the truss top plate is adjusted according to the number of heat exchanger pipes.

3. The structural frame for receiving pulse current-assisted brazing heat exchanger tubes according to claim 1, characterized in that: The inner cylinder is made of sheet metal. The sheet metal is pre-processed into the shape of the unfolded inner cylinder. Then, the processed sheet metal is hollowed out according to the hollowed-out shape of the inner cylinder. The hollowed-out structure does not affect the structural load-bearing capacity, nor does it affect the airflow. Finally, the hollowed-out sheet metal is rolled into a cylindrical shape according to the inner cylinder size and connected by welding. The height of the inner cylinder is adjusted according to the height of the heat exchange pipes.

4. A structural frame for receiving pulse current-assisted brazing heat exchanger tubes according to claim 1, characterized in that: The connecting strip is made of sheet material. First, the sheet material is processed into six narrow-sided fan-shaped strips with a fan angle of 60° according to the outer circle size of the truss top plate. Then, two screw holes are processed, the size and position of which match the screw holes on the outer ring of the truss top plate. A chamfer is processed on the lower outer side of the fan-shaped strips. The two small pieces of the truss top plate are connected and fixed by a connecting strip.

5. A structural frame for receiving pulse current-assisted brazing heat exchanger tubes according to claim 4, characterized in that: The number of connecting strips is the same as the number of small pieces on the truss top plate.

6. A structural frame for receiving pulse current-assisted brazing heat exchanger tubes according to claim 1, characterized in that: The circular connecting block is made of sheet material. First, the sheet material is processed into a ring shape. Then, protrusions are processed according to the diode position of the heat exchange tube to fix the diode position of the heat exchange tube so that it does not move horizontally. Finally, screw holes are processed to fit with the top plate and bottom plate of the truss, respectively. The number of circular connecting blocks is adjusted according to the height of the heat exchange tube.

7. A structural frame for receiving pulse current-assisted brazing heat exchanger tubes according to claim 1, characterized in that: The outer ring has a racetrack-shaped hole, and 12 small holes are equally spaced on the innermost side of the inner ring for connecting the circular connecting blocks.

8. A structural frame for receiving pulse current-assisted brazing heat exchanger tubes according to claim 1, characterized in that: The truss top plate, inner cylinder, connecting strip, circular connecting block, truss bottom plate and screws are all made of GH4169.

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