Water-to-air heat exchanger with perforated exhaust passage

Abstract

The utility model relates to the technical field of heat exchanger provides a water air heat exchanger with porous exhaust passage, including upper collecting tube, lower collecting tube, flat tube, fin and side plate, the flat tube is connected between upper collecting tube and lower collecting tube, the fin is set between flat tube, the side plate is located between upper collecting tube and lower collecting tube, and in the both sides of upper collecting tube and lower collecting tube, be equipped with the baffle in the upper collecting tube, divide into two independent cavities with upper collecting tube, be equipped with air flow microchannel on the baffle. Through the arrangement of multiple air flow microchannels, strengthen gas exportation process, reduce gas retention, reduce the abnormal sound caused by gas-liquid collision, air flow microchannel is located at the edge of baffle, and close to the top of upper collecting tube, be favorable to gas discharge.

Description

Technical Field

[0001] This utility model relates to the technical field of heat exchangers, and in particular to a water-air heat exchanger with a porous exhaust channel. Background Technology

[0002] Water-air heat exchangers are devices that exchange heat between coolant and air, and are widely used in air conditioning and refrigeration systems. Double-row water-air heat exchangers, in particular, are common in automotive air conditioning systems due to their large heat exchange area and high space utilization. They regulate the temperature of the air inside the vehicle through the circulation of coolant within the core cavity, combined with a flat tube and finned heat exchange structure, directly affecting passenger comfort.

[0003] The core of existing double-drain air-cooled heat exchangers typically consists of two sets of manifolds, upper and lower, double rows of flat tubes, and a closed core cavity. Coolant enters the lower manifold through the inlet and is distributed into the double rows of flat tubes, where it exchanges heat with the air between the fins during flow. Finally, it converges into the upper manifold and flows out through the outlet. However, due to the limited flow design of the double-row structure, the connection path between the core cavity and the manifolds is often a single channel. Furthermore, when the coolant flows from bottom to top or in a specific direction within the core, differences in flow resistance and local pressure fluctuations can cause dissolved gases (such as air) or bubbles formed by the vaporization of a small amount of water during heat exchange to be difficult to expel synchronously with the coolant.

[0004] These air bubbles tend to get trapped in localized areas of the coolant core cavity (such as the top of the cavity, or the dead corner where the flat tube connects to the manifold), creating a persistent gas accumulation. When the coolant flows inside the core, its flow lines collide with and compress the trapped air bubbles, resulting in noticeable flow noise. In automotive air conditioning systems, this noise is transmitted to the cabin through the vehicle structure, becoming more pronounced at low vehicle speeds or when the air conditioning is running at low load, severely compromising passenger comfort.

[0005] Currently, there is no effective solution in existing technology to address the problem of bubble retention in dual-drain air heat exchangers, which can efficiently remove gas while avoiding abnormal noise from gas-liquid collision. Therefore, there is an urgent need for a technical solution that can optimize the exhaust structure of the core and improve user comfort and heat exchange stability. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a water-air heat exchanger with a porous exhaust channel, including an upper manifold, a lower manifold, a flat tube, fins, and a side plate. The flat tube is connected between the upper manifold and the lower manifold, and the fins are disposed between the flat tubes. The side plate is located between the upper manifold and the lower manifold and is on both sides of the upper manifold and the lower manifold. A partition is provided inside the upper manifold to divide the upper manifold into two independent cavities. The partition is provided with airflow microchannels.

[0007] Furthermore, the airflow microchannels are evenly distributed on the partition plate.

[0008] Furthermore, the airflow microchannels are square, inverted triangular, or elliptical in shape.

[0009] Furthermore, the side length of the square hole does not exceed 2mm.

[0010] Furthermore, the airflow microchannel is located at the edge of the partition and near the top of the upper manifold.

[0011] Furthermore, the airflow microchannel is an inwardly recessed channel.

[0012] Furthermore, the recessed airflow microchannels and the convex airflow microchannels are randomly staggered.

[0013] Furthermore, the water-air heat exchanger also includes an inlet and an outlet, which are respectively connected to two independent cavities.

[0014] Furthermore, the inlet and outlet are located on the same side.

[0015] Furthermore, the upper manifold is provided with an exhaust port.

[0016] This utility model has the following beneficial effects:

[0017] (1) In this utility model, multiple airflow microchannels are arranged to enhance the gas export process, reduce gas retention, and reduce abnormal noise caused by gas-liquid collision;

[0018] (2) In this utility model, the airflow microchannel is located at the edge of the partition and close to the top of the upper collection tube, which is conducive to gas discharge;

[0019] (3) The side length of the airflow microchannel in this utility model does not exceed 2mm, so as to avoid excessive liquid flow and reduce the impact of internal leakage on performance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 This is a structural schematic diagram of the utility model.

[0022] Figure 3 This is a schematic diagram of the partition plate of this utility model.

[0023] Figure 4 This is a schematic diagram of the internal gas-liquid flow distribution of this utility model. Detailed Implementation

[0024] The technical solution of this utility model will be further described in detail below with reference to specific embodiments. However, this embodiment is not intended to limit this utility model. Any similar structure or similar variation of this utility model should be included in the protection scope of this utility model. The commas in this utility model all indicate the relationship between and. The English letters in this utility model are case-sensitive.

[0025] like Figures 1-3 As shown, this utility model provides a water-air heat exchanger with a porous exhaust channel, including an inlet 1, an outlet 2, an upper manifold 3, a lower manifold 4, flat tubes 5, fins 6, and a side plate 7. The flat tubes 5 are connected between the upper manifold 3 and the lower manifold 4 (only a portion of the flat tubes is shown in the figure, the middle part is not shown). The fins 6 are disposed between the flat tubes 5 (only a portion of the fins are shown in the figure, fins are provided between the flat tubes but not fully shown). The side plate 7 is located between the upper manifold 3 and the lower manifold 4, and on both sides of the upper manifold 3 and the lower manifold 4. The upper manifold 3 is provided with a partition 31, which divides the upper manifold 3 into two independent cavities. The inlet 1 and the outlet 2 are respectively connected to the two independent cavities. The inlet 1 and the outlet 2 are located on the same side. The coolant is separated by baffle 31 to form a double-layer flow structure; the air exchanges heat with the coolant through the fin area, releasing or absorbing heat to obtain high-temperature or low-temperature air.

[0026] The partition plate 31 is provided with airflow microchannels 311. The upper manifold 3 is provided with exhaust holes 30 to discharge gas outside the water-air heat exchanger. At least eight airflow microchannels 311 are provided; they are evenly distributed on the partition plate 31. The airflow microchannels 311 are square, inverted triangular, or elliptical in shape. The side length of the square holes does not exceed 2mm to prevent excessive liquid flow and reduce the impact of internal leakage on performance. The airflow microchannels 311 are located at the edge of the partition plate 31 and close to the top of the upper manifold 3, which facilitates gas discharge. The airflow microchannels 311 are inwardly recessed channels.

[0027] like Figure 4As shown, when coolant mixed with gas (in the direction of the thick red arrow) flows into one of the chambers, the gas will separate and concentrate at the top of the upper manifold due to gravity. Because of the addition of gas microchannels, under the pressure of liquid, the gas (in the direction of the yellow arrow) will first rush directly to the other chamber with less resistance and be discharged to the outside of the water-air heat exchanger along with the coolant on the outlet side (in the direction of the thick blue arrow). The liquid that separates the bubbles (in the direction of the thin red arrow) flows through one side flat tube, collects in the lower manifold, and then flows into another chamber through the other side flat tube. This flow process reduces the residence time of bubbles in the chamber, weakens gas-liquid collision, and reduces abnormal noise.

[0028] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

Claims

1. A water-air heat exchanger with a porous exhaust channel, comprising an upper manifold, a lower manifold, flat tubes, fins, and side plates, wherein the flat tubes are connected between the upper and lower manifolds, and the fins are disposed between the flat tubes; the side plates are located between the upper and lower manifolds and on both sides of the upper and lower manifolds, characterized in that, The upper manifold is equipped with a baffle plate, which divides the upper manifold into two independent cavities. The baffle plate is equipped with airflow microchannels.

2. A water-air heat exchanger with a porous exhaust channel according to claim 1, characterized in that, The airflow microchannels are evenly distributed on the partition.

3. A water-air heat exchanger with a porous exhaust channel according to claim 1, characterized in that, The airflow microchannels are square, inverted triangular, or elliptical in shape.

4. A water-air heat exchanger with a porous exhaust channel according to claim 3, characterized in that, The side length of the square hole does not exceed 2mm.

5. A water-air heat exchanger with a porous exhaust channel according to claim 1, characterized in that, The airflow microchannel is located at the edge of the partition and near the top of the upper manifold.

6. A water-air heat exchanger with a porous exhaust channel according to claim 1, characterized in that, The airflow microchannel is an inwardly recessed channel.

7. A water-air heat exchanger with a porous exhaust channel according to claim 1, characterized in that, The water-air heat exchanger also includes an inlet and an outlet, which are respectively connected to two independent cavities.

8. A water-air heat exchanger with a porous exhaust channel according to claim 7, characterized in that, The inlet and outlet are located on the same side.

9. A water-air heat exchanger with a porous exhaust channel according to claim 1, characterized in that, The upper manifold is equipped with an exhaust port.

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