A compressed air heat exchanger with split baffle

Abstract

The utility model discloses a kind of compressed air heat exchangers with split baffle, it is related to heat exchanger structure technical field, including outer cylinder and built-in heat exchange tube. Heat exchange tube is equipped with inlet and outlet, it is through the surface of outer cylinder, its surface is rolled with multiple fins. Outer cylinder is opened inlet and outlet, its inner chamber and heat exchange tube inner chamber are mutually isolated. Multiple baffle plates are evenly distributed in the cylinder along the axial direction, baffle plate is spliced by long strip-shaped baffle, corresponding matching half opening is equipped in adjacent baffle near edge, form the aperture for heat exchange tube to pass through after splicing, and the gap between adjacent baffle plate is staggered arrangement. The structure makes aperture size more conform to heat exchange tube, effectively reduce gap, prevent fluid from streaming, improve heat exchange efficiency, and assembly is more simple and safe. At the same time, heat exchange tube can use thicker pipe material, can withstand high temperature and high pressure gas, avoid using a series of problems brought by pipe expansion process.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger structure technology, specifically to a compressed air heat exchanger with a split-type baffle plate. Background Technology

[0002] Compressed air heat exchangers rapidly regulate compressed air temperature through heat exchange structures (such as plate, shell-and-tube, or heat pipe designs). Temperature control ensures stable system operation or enables energy recovery and improved energy efficiency. They are widely used in industrial, energy, and aerospace fields.

[0003] In existing shell-and-tube heat exchangers, multiple heat exchange fins are typically added to the air side of the pipe to improve heat exchange efficiency. The assembly of the fins and pipe usually employs a tube expansion process. Specifically, several fins are fitted onto the pipe, and then a tube expansion device is used to expand the pipe, causing the fins to tightly adhere to the base pipe. For example, patent document CN220387684U discloses a pre-lubricated tube expansion device, which relates to the tube expansion process. Pipes using this process have the following characteristics: thin-walled pipes, less than 1.5 mm thick; welded or seamless pipes, but mostly welded pipes; and stainless steel pipes. However, in the context of compressed air heat exchangers, this type of pipe has the following drawbacks: high-pressure steam, such as 1.0 MPa, flows through the pipe during compressed air heat exchange; the thin pipe wall (less than 1.5 mm thick) cannot withstand the high-pressure impact, leading to pipe rupture or cracking of welded pipes, causing high-pressure steam / liquid leakage.

[0004] On the other hand, to improve heat exchange efficiency, baffles are also installed inside the heat exchanger to extend the heat exchange flow path. Specifically, the heat exchange tubes formed by assembling the pipes and fins need to pass through the assembly openings on the baffles. The problem is that the radial dimension of the fins is larger than that of the pipes, and the radial dimension of the assembly openings is also larger than or equal to that of the fins, and there are also gaps between adjacent fins; therefore, a large gap will be formed between the baffles and the pipes in the final assembled heat exchanger; when air flows, some air will flow through the gaps, forming crossflow and affecting heat exchange efficiency. Moreover, multiple heat exchange tubes need to pass through each baffle, the size of the assembly openings is not large, and the edges of the fins are very sharp, making the assembly of the baffles and heat exchange tubes extremely difficult. Even if the pipes are expanded after passing through the baffles, it is easy to cause worker injury during assembly.

[0005] Therefore, there is an urgent need to provide a compressed air heat exchanger with a split baffle plate to solve the above technical problems. Summary of the Invention

[0006] To address the problems in related technologies, this utility model proposes a compressed air heat exchanger with a split baffle plate, which can reduce the assembly difficulty of the baffle plate and heat exchange tube, and reduce or eliminate the gap between the baffle plate and heat exchange tube to prevent air crossflow; the heat exchange tube can withstand the passage of high temperature and high pressure gas.

[0007] This utility model is implemented as follows:

[0008] A compressed air heat exchanger with a split-type baffle plate includes an outer cylinder and heat exchange tubes; the heat exchange tubes have a steam inlet and a steam outlet, the heat exchange tubes extend from the steam inlet into the interior of the outer cylinder, and exit through the steam outlet onto the surface of the outer cylinder; multiple fins are rolled along the surface of the heat exchange tubes inside the outer cylinder; the surface of the outer cylinder has an air inlet and an air outlet; the inner cavity of the outer cylinder and the inner cavity of the heat exchange tubes are isolated from each other;

[0009] A plurality of baffles are provided between the air inlet and the air outlet; the plurality of baffles are evenly distributed along the axial direction of the inner cavity of the outer cylinder and perpendicular to the axial direction; each baffle forms a notch between itself and the outer cylinder; adjacent notches are staggered.

[0010] The baffle is formed by splicing and fixing multiple long strip-shaped baffles; each baffle has several evenly distributed semi-openings near the edge of the adjacent baffles; after splicing, the semi-openings of two adjacent baffles correspond one-to-one to form a through-hole for the heat exchange tube to pass through.

[0011] The above refers to any number.

[0012] When air is compressed, its temperature rises dramatically (reaching 120°C or even higher). Air at such high temperatures cannot be used directly and must be cooled.

[0013] The heat exchange tubes are used to circulate high-temperature, high-pressure steam. The steam enters through the steam inlet, condenses, and exits through the steam outlet. The outer cylinder forms a heat exchange channel for filling with flowing ambient air or other refrigerants. The ambient air enters through the air inlet, exchanges heat with the heat exchange tubes and their fins, and then exits through the air outlet.

[0014] By using notches in the baffles, the heat exchange channels form a zigzag pattern with back-and-forth direction, resulting in more complete heat exchange and better heat exchange efficiency. With staggered placement, adjacent notches can be positioned as far apart as possible. Specifically, the baffles in this design are single-arched baffles.

[0015] During assembly, first place one layer of baffles, then place multiple heat exchange tubes on the semi-opening, and then place another layer of baffles; splice the upper and lower layers of baffles together and weld them together to complete the fixation; repeat this process to complete the splicing of all baffles.

[0016] With the above solution, thicker pipes can be used for heat exchangers, and the fins can be fixed to the heat exchangers using a rolling process, eliminating the need for tube expansion. Furthermore, by assembling baffles and heat exchangers, the radial dimensions of the perforation can be made to better fit the heat exchangers while forming baffles, significantly reducing gaps and preventing fluid cross-flow during heat exchange. The overall equipment is also easier to assemble, and the assembly process is safer.

[0017] As a further optimization of the above scheme, between two adjacent baffles, the heat exchange tube is provided with a number of evenly distributed fins; there is a minimum interval between the baffles and the fins.

[0018] Setting multiple minimum interval areas on the heat exchange tube, that is, areas without fins, can prevent the fins from getting stuck at the half-opening during installation. On the other hand, it also creates space for the welding torch to extend into, ultimately improving the convenience of assembling parts.

[0019] As a further optimization of the above scheme, the minimum interval is 10mm-40mm.

[0020] As a further optimization of the above scheme, the outer cylinder is provided with two sealing plates, which are perpendicular to the axial direction and are sealed to the inner wall of the outer cylinder on its periphery; the air inlet, the air outlet and the baffle are all located between the two sealing plates; between the sealing plates and the baffle, the heat exchange tube is provided with a number of evenly distributed fins.

[0021] The sealing plate is formed by splicing and fixing multiple baffles.

[0022] A heat exchange channel for ambient temperature airflow is formed between the sealing plate, baffle plate, and outer cylinder.

[0023] As a further optimization of the above scheme, the radial dimension of the heat exchange tube is smaller than the radial dimension of the through-hole, and the difference in radial dimensions is 0.5mm-1.5mm.

[0024] After high-temperature steam enters the heat exchange tubes, the tubes will expand under thermal stress. By setting a radial dimension difference, the thermal expansion gap is ensured to avoid tube and plate compression deformation, while suppressing airflow leakage, preventing crossflow, and maintaining heat exchange efficiency.

[0025] As a further optimization of the above scheme, the height of the steam inlet is greater than the height of the steam outlet; the heat exchange tube is also provided with a branch drain outlet at the steam outlet; the drain outlet opening faces downward.

[0026] The steam inlet and outlet are connected to the high-temperature air generating equipment and the compressed air storage equipment, respectively, and are normally connected without interruption. When the heat exchange operation stops, condensed liquid may remain inside the heat exchange tubes, which can be drained through the drain port.

[0027] As a further optimization of the above scheme, the heat exchange tube is also provided with a branch exhaust port at the steam inlet; the exhaust port opening faces upward. When the heat exchange operation stops, high-pressure air may remain inside the heat exchange tube, which can be discharged through the exhaust port.

[0028] As a further optimization of the above solution, a drain port is also provided at the bottom of the outer cylinder; the drain port opens downwards. Condensate or other liquids may be generated inside the outer cylinder after heat exchange. The drain port can remove residual liquids.

[0029] As a further optimization of the above scheme, the heat exchange tubes are arranged in a serpentine pattern inside the outer cylinder.

[0030] As a further optimization of the above solution, the heat exchange tube is made of stainless steel or carbon steel.

[0031] The beneficial effects are as follows:

[0032] This invention provides a compressed air heat exchanger with a split-type baffle. By using a baffle formed by splicing split baffles, thicker pipes can be used for the heat exchange tubes. The fins are fixed to the heat exchange tubes using a rolling process, eliminating the need for tube expansion. This allows the heat exchange tubes to withstand the passage of high-temperature, high-pressure fluids without cracking. Furthermore, by assembling the baffles and heat exchange tubes, the radial dimensions of the through-holes can be more closely matched to the heat exchange tubes while forming the baffle, significantly reducing gaps and preventing fluid cross-flow during heat exchange. The overall equipment is also easier to assemble, and the assembly process is safer. Attached Figure Description

[0033] Figure 1 A front view of a compressed air heat exchanger with a split baffle plate provided for an embodiment of this utility model;

[0034] Figure 2 for Figure 1 A schematic diagram of the connection of the internal structure;

[0035] Figure 3 A schematic diagram illustrating the assembly of the heat exchange tube, fins, and baffles provided in an embodiment of this utility model;

[0036] Figure 4 A schematic diagram illustrating the fit between the sealing plate and the outer cylinder provided in an embodiment of this utility model;

[0037] Figure 5A schematic diagram illustrating the fit between the baffle and the outer cylinder provided in this embodiment of the utility model;

[0038] Figure 6 A schematic diagram illustrating the split effect of the baffle provided in this embodiment of the utility model;

[0039] Figure label:

[0040] 1. Outer cylinder; 11. Air inlet; 12. Air outlet; 13. Sewage outlet;

[0041] 2. Heat exchange tube; 21. Steam inlet; 22. Steam outlet; 23. Exhaust outlet; 24. Drain outlet; 25. Fins;

[0042] 3. Seal the plate;

[0043] 4. Baffles;

[0044] 5. Gap;

[0045] 6. Baffle; 61. Semi-opening;

[0046] 7. Opening;

[0047] 8. Minimum interval. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0049] like Figures 1 to 6 As shown, this embodiment provides a compressed air heat exchanger with a split baffle plate, including an outer cylinder 1 and heat exchange tubes 2.

[0050] In this embodiment, the heat exchange tube 2 is a seamless thick-walled tube made of carbon steel. The heat exchange tube 2 has a steam inlet 21 and a steam outlet 22, with the height of the steam inlet 21 being greater than the height of the steam outlet 22. The heat exchange tube 2 extends from the steam inlet 21 into the interior of the outer cylinder 1 and exits the surface of the outer cylinder 1 through the steam outlet 22; inside the outer cylinder 1, the heat exchange tube 2 is arranged in a serpentine pattern.

[0051] In this embodiment, the heat exchange tube 2 is also provided with a branch drain outlet 24 at the steam outlet 22 and a branch exhaust outlet 23 at the steam inlet 21; the drain outlet 24 opens downwards and the exhaust outlet 23 opens upwards.

[0052] The heat exchange tube 2 is used to circulate high-temperature, high-pressure steam. The steam enters through the steam inlet 21, is condensed, and is output from the steam outlet 22. The steam inlet 21 and the steam outlet 22 are connected to the high-temperature air generating equipment and the compressed air storage equipment, respectively, and are normally connected without disconnection. When the heat exchange operation stops, condensed liquid and high-pressure gas may remain inside the heat exchange tube 2. The residual condensed liquid can be discharged through the drain port 24, and the high-pressure air can be discharged through the exhaust port 23.

[0053] In this embodiment, the outer cylinder 1 is provided with two sealing plates 3, which are perpendicular to the axial direction and are sealed to the inner wall of the outer cylinder 1 around its periphery. Between the two sealing plates 3, the surface of the outer cylinder 1 is provided with an air inlet 11 and an air outlet 12; between the air inlet 11 and the air outlet 12, the outer cylinder 1 is also provided with multiple single-arch baffles 4. The multiple baffles 4 are evenly distributed along the axial direction of the inner cavity of the outer cylinder 1 and are perpendicular to the axial direction; each baffle 4 forms a notch 5 with the outer cylinder 1; adjacent notches 5 are staggered. The inner cavity of the outer cylinder 1 and the inner cavity of the heat exchange tube 2 are isolated from each other.

[0054] By setting the notches 5 in the baffles 4, the heat exchange channels form a zigzag shape with back-and-forth reversals, resulting in more complete heat exchange and better heat exchange efficiency. After the staggered setting, the positions of adjacent notches 5 can be as far apart as possible.

[0055] In this embodiment, the baffle plate 4 and the sealing plate 3 are respectively formed by splicing and fixing multiple strip-shaped baffles 6. Specifically, each baffle 6 has multiple evenly distributed semi-openings 61 near the edge of the adjacent baffle 6; after splicing, the semi-openings 61 of two adjacent baffles 6 correspond one-to-one, forming a through-hole 7 for the heat exchange tube 2 to pass through.

[0056] In this embodiment, the radial dimension of the heat exchange tube 2 is 21 mm, and the diameter of the through hole 7 is 22 mm, with a difference of 1 mm.

[0057] During assembly, first place a layer of baffle 6, then place multiple heat exchange tubes 2 on the semi-opening 61, and then place another layer of baffle 6; splice the upper and lower layers of baffle 6 together and weld them together to complete the fixation, specifically by using argon arc welding; and so on, to complete the splicing of all baffle 6.

[0058] After high-temperature steam enters heat exchange tube 2, it will expand under thermal stress. The radial dimension difference is set to ensure thermal expansion gap, avoid tube and plate compression deformation, suppress airflow leakage, avoid crossflow, and maintain heat exchange efficiency.

[0059] Located inside the outer cylinder 1, multiple fins 25 are rolled along the surface of the heat exchange tube 2. Specifically, multiple evenly distributed fins 25 are provided on the heat exchange tube 2 between two adjacent baffles 4; multiple evenly distributed fins 25 are provided on the heat exchange tube 2 between the sealing plate 3 and the baffles 4. The fins 25 are made of aluminum. In this embodiment, there is a minimum spacing 8 between the baffles 4 and the fins 25, and a minimum spacing 8 between the sealing plate 3 and the fins 25, the minimum spacing 8 being 10mm.

[0060] Multiple minimum interval 8 areas are set on the heat exchange tube 2, that is, areas where no fins 25 are installed. On the one hand, this can prevent the fins 25 from getting stuck at the semi-opening 61 during installation. On the other hand, it also forms a space for the welding torch to be inserted, ultimately improving the convenience of assembling parts.

[0061] A heat exchange channel is formed inside the outer cylinder 1 for filling in flowing ambient air or other refrigerants. The ambient air is input from the air inlet 11, exchanges heat with the heat exchange tube 2 and its fins 25, and is output from the air outlet 12.

[0062] In this embodiment, a drain port 13 is also provided at the bottom of the outer cylinder 1; the drain port 13 opens downwards. Condensate or other liquids may be generated inside the outer cylinder 1 after heat exchange. Residual liquids can be discharged through the drain port 13.

[0063] With the above solution, the heat exchange tube 2 can be made of a thicker pipe, and the fins 25 can be fixed to the heat exchange tube 2 using a rolling process, without the need for tube expansion. Furthermore, by assembling the baffle 6 with the heat exchange tube 2, the radial dimension of the through-hole 7 can be made to fit the heat exchange tube 2 more closely while forming the baffle 4, greatly reducing the gaps and preventing fluid crossflow during heat exchange. The overall equipment is also easier to assemble, and the assembly process is safer.

[0064] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A compressed air heat exchanger with a split-type baffle plate, characterized in that: It includes an outer cylinder and heat exchange tubes; the heat exchange tubes have a steam inlet and a steam outlet, the heat exchange tubes extend from the steam inlet into the interior of the outer cylinder, and exit the surface of the outer cylinder through the steam outlet; multiple fins are rolled along the surface of the heat exchange tubes inside the outer cylinder; the surface of the outer cylinder has an air inlet and an air outlet; the inner cavity of the outer cylinder and the inner cavity of the heat exchange tubes are isolated from each other. A plurality of baffles are provided between the air inlet and the air outlet; the plurality of baffles are evenly distributed along the axial direction of the inner cavity of the outer cylinder and perpendicular to the axial direction; each baffle forms a notch between itself and the outer cylinder; adjacent notches are staggered. The baffle is formed by splicing and fixing multiple long strip-shaped baffles; each baffle has several evenly distributed semi-openings near the edge of the adjacent baffles; after splicing, the semi-openings of two adjacent baffles correspond one-to-one to form a through-hole for the heat exchange tube to pass through.

2. A compressed air heat exchanger with a split-type baffle plate according to claim 1, characterized in that: Between two adjacent baffles, the heat exchange tube is provided with a number of evenly distributed fins; there is a minimum interval between the baffles and the fins.

3. A compressed air heat exchanger with a split-type baffle plate according to claim 2, characterized in that: The minimum interval is 10mm-40mm.

4. A compressed air heat exchanger with a split-type baffle plate according to claim 1, characterized in that: The outer cylinder is provided with two sealing plates, which are perpendicular to the axial direction and are sealed to the inner wall of the outer cylinder on its periphery; the air inlet, the air outlet and the baffle are all located between the two sealing plates; between the sealing plates and the baffle, the heat exchange tube is provided with a number of evenly distributed fins. The sealing plate is formed by splicing and fixing multiple baffles.

5. A compressed air heat exchanger with a split-type baffle plate according to claim 1, characterized in that: The radial dimension of the heat exchange tube is smaller than the radial dimension of the through-hole, and the difference in radial dimensions is 0.5mm-1.5mm.

6. A compressed air heat exchanger with a split-type baffle plate according to claim 1, characterized in that: The height of the steam inlet is greater than the height of the steam outlet; the heat exchange tube is also provided with a branch drain outlet at the steam outlet; the drain outlet opening faces downward.

7. A compressed air heat exchanger with a split-type baffle plate according to claim 6, characterized in that: The heat exchange tube is also provided with a branch exhaust port at the steam inlet; the exhaust port opening faces upward.

8. A compressed air heat exchanger with a split-type baffle plate according to claim 1, characterized in that: The bottom of the outer cylinder is also provided with a drain outlet; the drain outlet faces downward.

9. A compressed air heat exchanger with a split-type baffle plate according to claim 1, characterized in that: Inside the outer cylinder, the heat exchange tubes are arranged in a serpentine pattern.

10. A compressed air heat exchanger with a split-type baffle plate according to claim 1, characterized in that: The heat exchange tube is made of stainless steel or carbon steel.

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