Micro-channel heat exchanger

Abstract

The utility model relates to the technical field of heat exchange, in particular to a micro-channel heat exchanger which comprises a heat exchange shell, snakelike material pipes, a feeding port and a discharging port, a micro-channel heat exchange plate is arranged in the heat exchange shell, the snakelike material pipes are arranged on the left side and the right side in the heat exchange shell, a rear arc-shaped shell is arranged at the top end of the rear side of the heat exchange shell, and a micro-channel heat exchange plate is arranged on the rear arc-shaped shell. A front arc-shaped shell is arranged at the bottom end of the front side of the heat exchange shell, a feeding port is formed in the top of the S-shaped material pipe, and a discharging port is formed in the bottom of the S-shaped material pipe. The detention time of a medium on a heat exchange interface is remarkably prolonged by prolonging a vertical flow path of fluid through the circuitous structure of the snakelike flow channel, a heat conduction time window and energy transfer strength generate a synergistic strengthening effect through the design of the expanded flow channel, and controllable optimization of medium contact time and stable improvement of heat exchange efficiency are achieved. And finally, the time and strength two-dimensional enhancement of the heat energy exchange process is achieved through geometric configuration innovation.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, and in particular to microchannel heat exchangers. Background Technology

[0002] The design and application of heat exchangers have always been a core component in the chemical, pharmaceutical, and offshore petrochemical industries. Their technological development is closely linked to industry needs. With the acceleration of global industrialization, the heat exchanger market continues to expand, and the industry is evolving towards high efficiency, intelligence, and green practices.

[0003] Common microchannel heat exchangers only include the function of heat exchange, which can exchange heat with the medium, but lack the function of increasing the heat exchange time. They cannot guarantee the heat exchange rate and are prone to the medium passing through the heat exchanger for too long. When the medium flow rate exceeds the design threshold, it will significantly reduce the effective contact time between the medium and the surface of the heat exchange plate. This short thermal interaction process will directly weaken the overall heat transfer efficiency of the device, resulting in insufficient heat exchange and affecting the heat exchange rate.

[0004] Therefore, given that the aforementioned microchannel heat exchangers lack the function of increasing heat exchange time, and that when the medium flow rate exceeds the limit, the effective contact time with the heat exchange plate is shortened due to excessive flow velocity, resulting in a brief thermal interaction process, which directly reduces heat transfer efficiency and causes insufficient heat exchange, there is an urgent need to design a new type of microchannel heat exchanger. Utility Model Content

[0005] To overcome the common problem that microchannel heat exchangers lack the function of increasing heat exchange time, when the medium flow rate exceeds the limit, the effective contact time with the heat exchange plate will be shortened due to the excessive flow velocity, forming a brief heat interaction process, which directly reduces the heat transfer efficiency and causes insufficient heat exchange.

[0006] The technical solution of this utility model is as follows: a microchannel heat exchanger, including a heat exchange shell, a serpentine tube, a feed inlet and a discharge outlet. A microchannel heat exchange plate is provided inside the heat exchange shell. Serpentine tubes are provided on the left and right sides inside the heat exchange shell. A rear arc-shaped shell is provided at the top of the rear side of the heat exchange shell. A front arc-shaped shell is provided at the bottom of the front side of the heat exchange shell. A feed inlet is provided at the top of the serpentine tube, and a discharge outlet is provided at the bottom of the serpentine tube.

[0007] Preferably, by opening the valve of the medium inlet flange, the medium enters the interior of the heat exchange shell through the rear arc-shaped shell. Subsequently, the medium enters the interior of the serpentine feed tube through the feed port. The medium inside the serpentine feed tube flows downward and contacts the outer wall of the microchannel heat exchange plate during the flow. The serpentine feed tube increases the downward flow path of the medium, thereby increasing the contact time between the medium and the outer wall of the microchannel heat exchange plate. This allows the medium sufficient time for heat exchange, thus achieving the function of increasing the heat exchange duration.

[0008] Preferably, a medium inlet flange is provided on the rear side of the rear arc-shaped shell, and a medium outlet flange is provided on the front side of the front arc-shaped shell.

[0009] Preferably, the heat exchange shell is provided with an upper cover at the top and a lower cover at the bottom.

[0010] Preferably, a partition plate is provided at the bottom of the upper cover and the top of the lower cover, and a heat exchange hole is provided in the center of the partition plate.

[0011] Preferably, the top of the upper cover is provided with a heat exchange inlet flange pipe, and the bottom of the lower cover is provided with a heat exchange outlet flange pipe.

[0012] Preferably, fixed vertical plates are provided on the left and right sides of the heat exchange shell, and a fixed horizontal plate is provided at the bottom of the fixed vertical plates on the side away from the heat exchange shell.

[0013] Preferably, fixed side plates are provided on the front and rear sides of the top of the fixed horizontal plate, and the side plates closest to the heat exchange shell are welded to the fixed vertical plate.

[0014] The beneficial effects of this utility model are:

[0015] 1. The meandering spatial layout of the serpentine tube significantly extends the length of the fluid's vertical trajectory. The resulting extended flow trajectory effect directly translates into a stepwise increase in the contact time between the medium and the outer wall of the microchannel heat exchange plate, allowing the medium to obtain a sufficient heat conduction time window at the heat exchange interface. Based on the flow channel expansion characteristics formed by this structural innovation, the device exhibits the dual advantages of improved controllability of medium residence time and enhanced stability of heat exchange efficiency during operation. Through geometric optimization, the time dimension of the heat exchange process is extended and the energy transfer intensity is directionally enhanced. Attached Figure Description

[0016] Figure 1 The diagram shown is a schematic representation of the overall structure of the microchannel heat exchanger of this utility model.

[0017] Figure 2 The diagram shown is a schematic cross-sectional view of the microchannel heat exchanger of this utility model.

[0018] Figure 3 The diagram shown is a schematic representation of the heat exchange shell structure of the microchannel heat exchanger of this utility model.

[0019] Figure 4 The diagram shown is a schematic representation of the structure of the microchannel heat exchange plate in the microchannel heat exchanger of this utility model.

[0020] Figure 5 The diagram shown is a schematic representation of the heat exchange inlet and outlet components of the microchannel heat exchanger of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Heat exchange shell; 2. Partition plate; 3. Heat exchange hole; 4. Microchannel heat exchange plate; 5. Serpentine feed tube; 6. Feed inlet; 7. Discharge outlet; 8. Upper cover; 9. Heat exchange inlet flange; 10. Lower cover; 11. Heat exchange outlet flange; 12. Rear arc-shaped shell; 13. Medium inlet flange; 14. Front arc-shaped shell; 15. Medium outlet flange; 16. Fixed vertical plate; 17. Fixed horizontal plate; 18. Fixed side plate. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please see Figures 1-5 This utility model provides an embodiment of a microchannel heat exchanger, including a heat exchange shell 1, a serpentine tube 5, an inlet 6, and an outlet 7. A microchannel heat exchange plate 4 is disposed inside the heat exchange shell 1. Serpentine tubes 5 are disposed on the left and right sides inside the heat exchange shell 1. A rear arc-shaped shell 12 is disposed at the top rear side of the heat exchange shell 1, and a front arc-shaped shell 14 is disposed at the bottom front side of the heat exchange shell 1. The inlet 6 is opened at the top of the serpentine tube 5, and the outlet 7 is opened at the bottom of the serpentine tube 5. During operation, by opening the valve of the medium inlet flange 13, the medium enters the internal cavity of the heat exchange shell 1 along the guide structure of the rear arc-shaped shell 12. Subsequently, under pressure, it is injected into the channel of the serpentine tube 5 through the inlet 6. Under the combined action of gravity and flow potential energy, the medium flows down along the serpentine path. Its flow trajectory is influenced by the multiple continuous bends of the tube body. The flow rate is significantly extended during this process. The medium flow gradually transitions from the initial turbulent flow to the wall-attached laminar flow, forming a continuous contact surface with the outer wall of the microchannel heat exchange plate 4. Energy exchange is achieved through the mechanism of heat conduction. As the medium gradually moves within the serpentine tube 5, its flow velocity fluctuates periodically due to the increased path complexity. This dynamic change causes the medium temperature gradient to form an unsteady heat transfer field on the surface of the microchannel heat exchange plate 4. Combined with the unique retention effect of the serpentine tube, the heat exchange time per unit volume of medium is increased compared to the straight tube structure. During operation, the medium flow rate can be controlled by adjusting the opening of the inlet valve. When the flow rate increases, the system automatically compensates for the velocity increment through the damping effect of the serpentine path, maintaining stable heat transfer conditions in the boundary layer of the outer wall of the heat exchange plate. Ultimately, this achieves efficient temperature evolution of the medium inside the shell, completing the phase change or sensible heat exchange process.

[0024] Please see Figures 2-5In this embodiment, a medium inlet flange pipe 13 is provided on the rear side of the rear arc-shaped shell 12, and a medium outlet flange pipe 15 is provided on the front side of the front arc-shaped shell 14. By opening the valve of the medium inlet flange pipe 13, the medium enters the interior of the heat exchange shell 1 through the rear arc-shaped shell 12. After opening the valve of the medium outlet flange pipe 15, the medium flowing downward from the serpentine pipe 5 is discharged from the medium outlet flange pipe 15. An upper cover 8 is provided on the top of the heat exchange shell 1, and a lower cover 10 is provided on the bottom of the heat exchange shell 1. The upper cover 8 and the lower cover 10 increase the space inside the entire heat exchanger. A partition plate 2 is provided at the bottom of the upper cover 8 and the top of the lower cover 10. A heat exchange hole 3 is opened in the center of the partition plate 2. Cold water or hot water entering the interior of the upper cover 8 flows into the interior of the microchannel heat exchange plate 4 through the heat exchange hole 3 on the upper partition plate 2. After flowing out of the interior of the microchannel heat exchange plate 4, cold water or hot water flows into the interior of the lower cover 10 through the heat exchange hole 3 on the lower partition plate 2.

[0025] Please see Figures 1-5 In this embodiment, a heat exchange inlet flange pipe 9 is provided at the top of the upper cover 8, and a heat exchange outlet flange pipe 11 is provided at the bottom of the lower cover 10. Hot or cold water enters the interior of the upper cover 8 through the heat exchange inlet flange pipe 9, and hot or cold water flowing down from the microchannel heat exchange plate 4 is discharged from the heat exchange outlet flange pipe 11. Fixed vertical plates 16 are provided on the left and right sides of the heat exchange shell 1, and a fixed horizontal plate 17 is provided at the bottom of the side of the fixed vertical plate 16 away from the heat exchange shell 1. The fixed vertical plate 16 is welded to the heat exchange shell 1, and the fixed horizontal plate 17 is welded to the fixed vertical plate 16. The fixed horizontal plate 17 and the fixed vertical plate 16 are assembled in an L-shape. Fixed side plates 18 are provided on the front and rear sides of the top of the fixed horizontal plate 17. The side of the fixed side plate 18 close to the heat exchange shell 1 is welded to the fixed vertical plate 16. An external device is inserted into the middle of the two fixed side plates 18, and the position of the external device is limited by the two fixed side plates 18.

[0026] During operation, when hot or cold water is injected into the sealed space of the upper cover 8 through the heat exchange inlet flange pipe 9, the fluid forms a directional flow channel through the heat exchange holes 3 in the upper partition plate 2 and enters the inner cavity of the microchannel heat exchange plate 4. The fluid, having completed heat transfer within the plate, continues downwards and is guided through the heat exchange holes 3 in the lower partition plate 2 into the collecting chamber of the lower cover 10. Finally, the heat carrier is directionally output through the heat exchange outlet flange pipe 11. Simultaneously, the valve of the medium inlet flange pipe 13 is opened, allowing the medium to flow through the curved transition structure of the rear arc-shaped shell 12 and enter the main working chamber of the heat exchange shell 1. The medium is then injected into the continuous serpentine bending structure of the serpentine tube 5 through the inlet 6. Under the combined effect of gravity and the tube shape, it continues to flow downward along the vertical axis. During this process, the medium flow continuously contacts the outer surface of the microchannel heat exchange plate 4. The spatial topology of the serpentine tube 5 significantly increases the effective flow length of the medium through the geometric extension effect. The resulting contact time multiplication mechanism allows the medium to obtain a sufficient energy exchange cycle. The medium that has completed heat transfer is finally discharged in a controlled manner through the medium outlet flange pipe 15. The entire device achieves simultaneous optimization of heat exchange time and efficiency through the spatiotemporal synergy of the dual fluid paths.

[0027] Through the above steps, by opening the valve body of the medium inlet flange 13, the medium flows through the curved guide channel of the arc-shaped shell 12 and enters the main working area of ​​the heat exchange shell 1. Subsequently, the medium enters the continuous bending channel of the serpentine tube 5 through the directional distribution structure of the feed inlet 6. Under the drive of gravity, the medium forms a slow downward flow mode along the spiral descent path of the serpentine tube 5. During the flow, the continuous phase of the medium contacts the outer surface of the microchannel heat exchange plate 4. Based on the extension characteristics of the geometric path of the serpentine tube 5, the total flow path of the medium is structurally extended, thereby allowing the medium to flow through the microchannel heat exchange plate 4. The adhesion contact on the outer wall generates a time accumulation effect. This spatiotemporal extension mechanism effectively extends the physical cycle of energy exchange during heat transfer. Ultimately, the redesign of the flow channel morphology achieves a systematic improvement in the medium heat exchange duration parameter. This addresses the common problem of microchannel heat exchangers, which only have the function of heat exchange and can exchange heat with the medium, but lack the function of increasing the heat exchange duration. As a result, they cannot guarantee the heat exchange rate and are prone to technical defects such as insufficient fluid residence time if the medium flow rate exceeds the preset design threshold during heat exchanger operation, leading to a stepwise decline in overall heat transfer efficiency.

Claims

1. A microchannel heat exchanger, comprising a heat exchange shell (1); characterized in that: It also includes a serpentine tube (5), a feed inlet (6) and a discharge outlet (7). The heat exchange shell (1) is equipped with a microchannel heat exchange plate (4). The serpentine tube (5) is provided on the left and right sides inside the heat exchange shell (1). The rear arc shell (12) is provided at the top of the rear side of the heat exchange shell (1). The front arc shell (14) is provided at the bottom of the front side of the heat exchange shell (1). The feed inlet (6) is provided at the top of the serpentine tube (5). The discharge outlet (7) is provided at the bottom of the serpentine tube (5).

2. The microchannel heat exchanger according to claim 1, characterized in that: A medium inlet flange (13) is provided on the rear side of the rear arc-shaped shell (12), and a medium outlet flange (15) is provided on the front side of the front arc-shaped shell (14).

3. The microchannel heat exchanger according to claim 1, characterized in that: The heat exchange shell (1) is provided with an upper cover (8) at the top and a lower cover (10) at the bottom.

4. The microchannel heat exchanger according to claim 3, characterized in that: A partition plate (2) is provided at the bottom of the upper cover (8) and the top of the lower cover (10), and a heat exchange hole (3) is provided in the center of the partition plate (2).

5. The microchannel heat exchanger according to claim 4, characterized in that: The top of the upper cover (8) is provided with a heat exchange inlet flange pipe (9), and the bottom of the lower cover (10) is provided with a heat exchange outlet flange pipe (11).

6. The microchannel heat exchanger according to claim 1, characterized in that: Fixed vertical plates (16) are provided on the left and right sides of the heat exchange shell (1), and fixed horizontal plates (17) are provided at the bottom of the fixed vertical plates (16) on the side away from the heat exchange shell (1).

7. The microchannel heat exchanger according to claim 6, characterized in that: Fixed side plates (18) are provided on the front and rear sides of the top of the fixed horizontal plate (17). The side plate (18) is welded to the fixed vertical plate (16) on the side of the fixed side plate (1) close to the heat exchange shell (1).

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