Integrally-welded three-medium heat exchanger

Abstract

The invention discloses an integrally-welded three-medium heat exchanger which comprises a heat exchange core, collecting pipes, flat pipes and fins are arranged on the heat exchange core, the flat pipes are longitudinally arranged, the fins are arranged on at least one side of each flat pipe, and all the fins are tightly attached to the flat pipes; the collecting pipe is provided with a connecting pipe or a filler flange which is communicated with an external medium inlet / outlet; a plate bundle unit is arranged on the outer side of the heat exchange core, and the plate bundle unit is formed by sequentially overlapping a plurality of heat exchange plates and fins and sealing the heat exchange plates and the fins through all-welding of the peripheral edges; a first flow channel and a second flow channel are formed in the plate bundle unit, and the first flow channel and the second flow channel are not completely isolated from each other. According to the integrally-welded three-medium heat exchanger, the influence on the refrigerant side in a whole vehicle integrated system can be reduced, and the leakage risk is greatly reduced; meanwhile, the structure is compact, sealing performance is excellent, and heat efficiency is high.

Description

Technical Field

[0001] This invention relates to a vehicle-mounted refrigerator heat exchanger, and more particularly to a three-medium heat exchanger integrally welded. Background Technology

[0002] With the increasing popularity of automobiles, in-car refrigerators have become standard or optional equipment in more and more vehicles. Meanwhile, cold storage technology, an important means of addressing energy supply and demand imbalances and achieving peak shaving and valley filling, is also being used in in-car refrigerators. When cold storage is added, traditional two-medium heat exchangers are no longer adequately suited. Traditional three-medium heat exchange solutions typically use two independent heat exchangers connected in series via external piping, or a combination of shell-and-tube heat exchangers and plate heat exchangers. This approach has the following drawbacks: 1. Complex structure and large space occupation: It requires multiple independent refrigeration units and connecting pipes, resulting in low system integration and inconvenient installation and maintenance.

[0003] 2. Numerous sealing points and high risk of leakage: There are many connection points such as flanges and joints between components, and the welding requirements are high, which increases the possibility of media leakage. In particular, the continuous vibration and impact during vehicle operation place extremely high demands on the mechanical strength, sealing and reliability of the internal components of the refrigerator. The traditional welded structure of the cold accumulator is prone to fatigue cracks at the weld due to vibration, which leads to media leakage and poses a great safety hazard.

[0004] 3. High heat loss: External connecting pipes will dissipate some heat, reducing the overall thermal efficiency of the system.

[0005] 4. High manufacturing costs: The procurement, assembly, and testing costs of multiple independent refrigeration units and accessories are relatively high.

[0006] Therefore, there is an urgent need in the field for a heat exchanger that can integrate the heat exchange of three media into a compact unit, while possessing excellent sealing and high thermal efficiency. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an integrally welded three-medium heat exchanger that can reduce the impact on the refrigerant side in the vehicle integrated system and greatly reduce the risk of leakage; at the same time, it has a compact structure, excellent sealing performance and high thermal efficiency.

[0008] To solve the above-mentioned technical problems, the present invention provides an integrally welded three-medium heat exchanger, including a heat exchange core, wherein the heat exchange core is provided with a manifold, a flat tube, and fins, the flat tube is arranged longitudinally, and the fins are arranged on at least one side of the flat tube, all the fins being tightly fitted to the flat tube; the manifold is provided with a connecting pipe or a filling port flange communicating with the external medium inlet and outlet; a plate bundle unit is provided on the outside of the heat exchange core, the plate bundle unit being formed by multiple heat exchange plates and fins stacked sequentially and sealed by full welding around the perimeter; a first flow channel and a second flow channel are formed inside the plate bundle unit, the first flow channel and the second flow channel being not completely isolated from each other.

[0009] Furthermore, the fins provided on one or both sides of the flat tube are first-type fins, and the first-type fins are connected to the flat tube and the manifold by brazing.

[0010] Furthermore, the first type of fin has a windowed structure.

[0011] Furthermore, the plate bundle unit includes: a first type of plate that is attached to the outermost side of the internal heat exchange core; a second type of fin, which is a high-density corrugated fin without windows, located between the first type of plate and the second type of plate, and between the second type of plate and the third type of plate; a second type of plate that is a perforated plate to allow flow between the first flow channel and the second flow channel; and a third type of plate with a corrugated structure on its surface to enhance heat exchange; the first type of plate, the second type of fin, and the second type of plate are alternately stacked to form the first flow channel between two adjacent plates; and the second type of plate, the second type of fin, and the third type of plate are alternately stacked to form the third flow channel between two adjacent plates.

[0012] Furthermore, the thickness of the second type of plate is less than that of the first type of plate and the third type of plate; the first type of plate or the third type of plate is formed with a partition plate by stamping or welding, and the partition plate forms an independent, closed cavity after the plates are stacked.

[0013] Furthermore, the first and second flow channels are connected to the medium inlet outside the housing via connecting pipes or filling holes provided on the end plate or housing sidewall.

[0014] Furthermore, the plate bundle unit is arranged on one or both sides of the heat exchange core.

[0015] Compared with the prior art, the present invention has the following advantages: The integrated welded three-medium heat exchanger provided by the present invention integrates three independent flow channels into a heat exchange module through a unique plate bundle structure and full welding process, solving the problems of loose structure, easy leakage and low efficiency of traditional solutions; at the same time, the three-medium heat exchanger separates the cold storage side from the refrigerant side, which greatly reduces the impact on the refrigerant side in the vehicle integrated system, and greatly reduces the risk of leakage and the severity of the problem; at the same time, it has a compact structure and has excellent sealing performance and high thermal efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the integrally welded three-medium heat exchanger structure of the present invention; Figure 2 This is a schematic diagram of the internal heat exchange core, manifold, and flat tube assembly of the three-medium heat exchanger of the present invention. Figure 3 This is a schematic diagram of the internal heat exchange core of the integrally welded three-medium heat exchanger of the present invention; Figure 4 This is a top view of the internal structure of the integrally welded three-medium heat exchanger of the present invention.

[0017] The diagram is marked as follows: 1. Connecting pipe; 2. Type I fins; 3. Manifold; 4. Filling port flange; 5. Type III plates; 6. Flat pipe; 7. Type I plates; 8. Type II plates; 9. Type II fins. Detailed Implementation

[0018] The present invention will now be further described with reference to the accompanying drawings and embodiments.

[0019] Please see Figures 1-4 The three-medium heat exchanger with integral welding provided by the present invention includes an internal heat exchange core, on which a manifold 3, a flat tube 6, and a first type of fin 2 are provided. The flat tube 6 is arranged longitudinally, and the fins are arranged on one or both sides of the flat tube 6. All fins are tightly fitted with the flat tube 6. The flat tube 6, the first type of fin 2, and the manifold 3 are all made of high thermal conductivity metallic materials. The tightly fitting components are welded together by brazing, which greatly reduces the thermal resistance. The manifold 3 is equipped with a connecting pipe 1 or a filling port flange 4 to connect with the external medium inlet and medium outlet (refrigerant side).

[0020] Preferably, the first type of fin 2 may have a window structure to enhance the heat exchange intensity with the wind; A plate bundle unit is located on the outside of the internal heat exchange core. The plate bundle unit is formed by stacking multiple heat exchange plates and fins in sequence and sealing them by full welding around the edges. The plate bundle unit is internally constructed as two fluid channels that are not completely isolated from each other, namely a first flow channel and a second flow channel. Specifically, the plate bundle unit includes: The first type of plate 7 is made of a high thermal conductivity metal material and is closely fitted to the outermost side of the internal heat exchange core; The second type of fin 9 is made of a high thermal conductivity metal material. In particular, the fin is a high-density corrugated fin without windows and is located between the first type of plate 7 and the second type of plate 8, and between the second type of plate 8 and the third type of plate 5. The second type of plate 8 is made of a high thermal conductivity metal material, is relatively thin, and is a porous plate, which allows flow between the first flow channel and the second flow channel; The third type of plate 5 is made of a high thermal conductivity metal material. Preferably, the plate surface may have a corrugated structure to enhance heat exchange.

[0021] The first type of plate 7, the second type of fin 9, and the second type of plate 8 are alternately stacked to form the first flow channel between two adjacent plates; The second type of plate 8, the second type of fin 9, and the third type of plate 7 are alternately stacked to form a third flow channel between two adjacent plates; On the first type of plate 7 or the third type of plate 5, partition plates are formed by stamping or welding. After the plates are stacked, these partition plates form an independent, closed cavity inside the plate pair. This cavity is the sum of the first flow channel and the second flow channel. The tightly fitting parts are welded together by brazing, which greatly reduces the thermal resistance.

[0022] Specifically, the first and second flow channels are connected to the medium inlet outside the housing via a connecting pipe 1 or a filling hole provided on the end plate or the side wall of the housing.

[0023] Optionally, the plate bundle unit can be arranged on one or both sides of the internal heat exchange core; the flat tube 6 can be in one row, located in the middle; or it can be in two rows, with the first type of fin 2 arranged in the middle.

[0024] The integrally welded three-medium heat exchanger provided by this invention has the following advantages: 1. High integration and compactness: The heat exchange process of the three media is integrated into a set of heat exchange units, which greatly reduces the size and footprint of the equipment, and facilitates system layout and modular design.

[0025] 2. Excellent sealing performance: The fully welded structure completely eliminates the leakage risk caused by traditional flange and gasket connections, making it particularly suitable for handling high-pressure, high-risk or expensive media, with extremely high safety and reliability.

[0026] 3. Lower risk of leakage: Compared to directly immersing the heat exchanger in the cold storage solution, this method separates the refrigerant side from the cold storage solution side, greatly reducing the risk of refrigerant leakage due to leakage on the cold storage side.

[0027] 4. High thermal efficiency: The plate heat exchanger structure itself has a high heat transfer coefficient. The three media exchange heat indirectly through thin plates. The flow channel is reasonably arranged, the thermal resistance is small, and the heat transfer efficiency is high.

[0028] 5. Low manufacturing and maintenance costs: Although the welding process is demanding, it eliminates the need for multiple independent refrigeration units, connecting pipes, and a large number of sealing gaskets, simplifying the system structure and reducing overall manufacturing and long-term maintenance costs.

[0029] 6. Strong pressure resistance: The external pressure-bearing shell and the internal fully welded plate bundles together form a robust structure that can withstand high working pressure.

[0030] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be defined by the claims.

Claims

1. An integrally welded triple medium heat exchanger comprising a heat exchange core, characterized in that, The heat exchange core is provided with a collecting pipe, a flat tube and a fin, the flat tube is arranged longitudinally, at least one side of the flat tube is arranged with the fin, and all the fins are tightly attached to the flat tube; the collecting pipe is provided with a connecting pipe or a filling opening flange, and a medium inlet and outlet outside the collecting pipe are communicated; The heat exchange core is provided with a collecting pipe, a flat tube and a fin, the flat tube is arranged longitudinally, at least one side of the flat tube is arranged with the fin, and all the fins are tightly attached to the flat tube; the collecting pipe is provided with a connecting pipe or a filling opening flange, and a medium inlet and outlet outside the collecting pipe are communicated; 2. The integrally welded triple medium heat exchanger of claim 1, wherein, The fin arranged on one side or both sides of the flat tube is a first type of fin, and the first type of fin is connected to the flat tube and the collecting pipe by brazing.

3. The integrally welded triple medium heat exchanger of claim 2, wherein, The first type of fin has a window structure.

4. The integrally welded triple medium heat exchanger of claim 1 wherein, The plate bundle unit comprises: A first type of plate is attached to the outermost side of the internal heat exchange core; A second type of fin is a high-density corrugated sheet without a window structure, and is located between the first type of plate and the second type of plate and between the second type of plate and the third type of plate; A second type of plate is a porous plate, allowing flow between the first flow channel and the second flow channel; A third type of plate has a plate surface with a corrugated structure for enhancing heat exchange; The first type of plate, the second type of fin and the second type of plate are alternately stacked, and the first flow channel is formed between two adjacent plates; The second type of plate, the second type of fin and the third type of plate are alternately stacked, and the third flow channel is formed between two adjacent plates.

5. The integrally welded triple medium heat exchanger of claim 4, wherein, The thickness of the second type of plate is less than the thickness of the first type of plate and the third type of plate; the first type of plate or the third type of plate is formed with a partition plate by stamping or welding, and the partition plate forms an independent and closed cavity after the plates are stacked.

6. The integrally welded triple medium heat exchanger of claim 1 wherein, The first flow channel and the second flow channel are communicated with the medium inlet outside the shell through the connecting pipe or the filling hole provided on the end plate or the side wall of the shell.

7. The integrally welded triple medium heat exchanger of claim 1 wherein, The plate bundle unit is arranged on one side or both sides of the heat exchange core.

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