WO2014079123A1 - Heat exchange fins of heat exchanger - Google Patents

Abstract

A heat exchange fin of a heat exchanger comprises a base plate (1). The surface of the base plate (1) is wave-shaped. Several through holes (11) matched to the cooling medium pipeline are arranged on the base plate (1). Several louver structures (12) are arranged around the through holes (11) on the base plate (1). By arranging the louver structures (12) on the wave-shaped base plate (1), air can flow toward another side of the base plate (1) by the interspaces between the adjacent louvers (121, 122, 123) of the louver structures (12) when the air flows through the valley of the base plate (1), which prevents an air current vortex from forming. In addition, the air current flow is under conditions of turbulent flow for the change of air flow direction, which benefits heat transfer between the cooling medium pipeline and the air current and improves the heat exchange efficiency of the heat exchanger.

Description

 Heat exchanger for heat exchanger

 Technical field

 The invention relates to the technical field of air conditioners in electrical equipment Specifically, it relates to a heat exchange sheet for a heat exchanger for an air conditioner, and an improved technique of the heat exchange sheet of the heat exchanger.

 Background technique

Tube-fin heat exchangers are used in a wide range of applications in household air conditioners. Among them, three kinds of heat exchange sheets, such as slit sheet, louver and corrugated sheet, are the most common. As shown in Fig. 1 to Fig. 6, the arrows in the figure are the direction of airflow, but various forms of heat exchange sheets have their own advantages and disadvantages.

As shown in the slit sheets shown in Figs. 1 and 2, since a plurality of slits are formed in the heat exchange sheet, each slit acts to suppress the generation of the boundary layer of the air flow. It is known from heat transfer that the presence of a boundary layer of the gas flow will increase the thermal resistance and reduce the transfer of heat. The existence of the seam, the generation of the destructive airflow boundary layer, reduces the thermal resistance, and causes the heat exchanger to enhance heat transfer. However, due to the cutting action of each slit on the airflow, the flow resistance is increased. Especially in the evaporation condition, the surface of the fin has the condensed water, which further increases the flow resistance of the airflow, which is not conducive to the operation of the low-temperature evaporation condition.

As shown in Figures 3 and 4, the presence of louvers and louvers can change the flow direction of the airflow, so that the flow of the airflow is in a turbulent state. It is known from fluid mechanics that turbulent flow is beneficial to the heat transfer of the fluid. Good heat transfer performance under rated conditions. However, due to the certain angle between the louver and the airflow, usually around 25°, the flow of the blocked airflow increases the flow resistance, which is also unfavorable for the operation of the low-temperature evaporation condition.

As shown in Figures 5 and 6, the corrugated sheet has a certain angle of change with respect to the direction of the airflow due to the angle of the corrugated hemming, but has little change, but the flow resistance to the airflow is relatively opposite to that of Fig. 3. The reduction is beneficial to the operation of the low-temperature evaporation condition, but under the rated working condition, the efficiency of the heat exchange sheet is lowered due to the easy formation of the airflow vortex (B) on the corrugated hemming.

 Summary of the invention

 The object of the present invention is to provide a heat exchange sheet for a heat exchanger having a small air flow resistance and a good heat exchange effect in view of the above problems.

In order to achieve the above object, the present invention adopts a technical solution: a heat exchange sheet of a heat exchanger, comprising a substrate, the surface of the substrate is wavy, and a plurality of through holes are formed on the substrate, and the substrate is matched with the refrigerant pipe. in There are several louver structures around the through hole.

 The louver structure is symmetrically distributed on the substrate along the geometric center of the through hole.

 The above louver structures are symmetrically distributed on both sides of the line connecting the geometric centers of adjacent through holes.

 Another solution, the above The louver structure is distributed on both sides of the line connecting the geometric centers of adjacent through holes, and the louvers of the louver structure are parallel to the line connecting the geometric centers of the adjacent through holes.

 The substrate has a wavy cross section, and all of the through holes are longitudinally arranged on the substrate.

 The through holes are evenly arranged on the substrate, and the geometric centers of all the through holes are on the same straight line.

 The substrate is provided with a mounting through hole at a position where the louver structure is mounted, and the louver structure is fixed to the mounting through hole.

The louver structure comprises a half turn down half louver and a turn up half louver, the lower turn half louver and the upper turn half louver are respectively fixed on the side wall of the installation through hole, the lower half louver and the upper turn half louver are parallel to each other, and the half louver is turned down and The angle between the upper half of the louver and the geometric centerline of the through hole is between 0° and 90°, and there is a gap between the lower half louver and the upper half louver.

 The angle between the lower half louver and the upper half louver and the geometric center line of the through hole is 75 ° to 80 ° , At least one full louver is disposed between the lower half louver and the upper half louver, and both ends of the louver are fixed on the side wall of the installation through hole, and the whole louver is parallel with the lower half louver and the upper half louver respectively. Between the half louver and the whole louver, between the upper half of the louver and the whole louver, and between the adjacent two velocities Gap.

The invention maintains the good heat transfer performance of the corrugated sheet by providing a louver structure on the wavy substrate, and the air flows through the trough of the substrate, and can flow to the other side of the substrate through the gap between the adjacent louvers of the louver structure. Avoid the formation of airflow vortices, and at the same time, due to changes in the direction of the airflow, The turbulent flow of the airflow is beneficial to the heat transfer between the refrigerant pipe and the airflow. The heat exchange efficiency of the heat exchanger is improved; and the angle between the louver and the flow direction of the airflow is 10-15°, which is significantly smaller than the angle of about 25° of the existing louver, and the gap between the louvers is The flow of airflow increases the passage and reduces the flow resistance, which is conducive to the operation of low temperature evaporation conditions.

 DRAWINGS

 Figure 1 is a front view of a conventional slit sheet;

 Figure 2 is a cross-sectional view of a conventional slit sheet;

 Figure 3 is a front view of the existing louver;

 Figure 4 shows the existing louver and sectional view;

 Figure 5 is a front view of the existing corrugated sheet;

 Figure 6 shows the existing corrugated sheet and sectional view;

 Figure 7 is a front elevational view of a heat exchange sheet according to Embodiment 1 of the present invention;

 Figure 8 is an enlarged view of Part C in Figure 7;

 Figure 9 is a front elevational view of a heat exchange sheet according to Embodiment 2 of the present invention;

 Figure 10 is a cross-sectional view of the A-A section of Figures 7 and 9;

 Figure 11 is a cross-sectional view showing the A-A section of the louver structure of the present invention.

 detailed description

 The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

The heat exchange sheet of the heat exchanger of the present invention has a structure as shown in FIGS. 7 to 11, and includes a substrate 1. The cross-sectional shape of the substrate 1 is wavy, and the substrate 1 is provided with a plurality of through holes 11 for cooperating with the refrigerant pipe. , all through holes 11 The longitudinal direction is evenly arranged, and the geometric centers of the through holes 11 are on the same straight line. The substrate 1 is provided with a mounting through hole 120 for mounting the louver structure 12 around the through hole 11, and the louver structure 12 Installed in the hole wall of the through hole 120.

 The above louver structure 12 includes a half turn down half louver 121, an upturned half louver 122 and one or more pieces of full louvers 123 The lower half louver 121 and the upper half louver 122 are respectively fixed to the side wall of the mounting through hole 120, and the whole louver 123 is placed between the lower half louver 121 and the upper half louver 122, the whole louver The two ends of 123 are fixed on the side wall of the mounting through hole 120, and the lower half louver 121, the upper half louver 122 and the full louver 123 are parallel to each other, and the half louver is turned down 121, and the half louver is turned up. The angle between the 122 and the full louvers and 123 and the geometric centerline of the through hole 11 is between 0 ° and 90 °, and between the half louver 121 and the full louver 123, and the half louver 122 There is a gap between the two louvers 123 and the adjacent two louvers 123.

 Example 1

 In this embodiment, the cross-sectional shape of the substrate 1 is wavy, and the air guiding opening 124 of the louver structure 12 is directed to the through hole 11 The louver structure 12 is symmetrically distributed on the substrate 1 along the geometric center of the through hole 11, and the louver structure 12 is symmetrically distributed on both sides of the line connecting the geometric centers of the adjacent through holes 11, this embodiment is a full louver 123 For one piece, turn the half louver 121, the upper half louver 122 and the full louver 123 to the geometric center line of the through hole 11 at an angle of 75 ° to 80 °, turn down the half louver 121, turn up the half louver The angle between the 122 and the louvers and 123 and the geometric center of the adjacent through hole 11 is 15 ° to 33 °, between the half louver 121 and the whole louver 123, and the half louver The gap distance W between 122 and all louvers 123 and between two adjacent louvers 123 is 0.4 to 1.2 mm, and the height H of the substrate 1 is 0.5 to 0.7 mm. The α3 between the cross-section of the substrate 1 and the direction of air flow is 7 to 15 °.

 The working principle of the embodiment: in use, the refrigerant pipe passes through the through hole 11, and the airflow is blown from the outside of the heat exchange sheet, and the arrow in the drawing is the airflow direction. The airflow passes through the trough of the substrate 1 on which the louver structure 12 is mounted, and the airflow passes from the slit of the louver structure 12 through the other side of the substrate 1, avoiding the formation of the airflow vortex, and at the same time, due to the change of the airflow direction, The turbulent flow of the airflow is beneficial to the heat transfer between the refrigerant pipe and the airflow, thereby improving the heat exchange efficiency of the heat exchanger.

 Example 2:

 The structure of the heat exchange sheet of the heat exchanger of this embodiment is similar to that of Embodiment 1, except that the louver structure 12 is arranged differently on the substrate 1. . Specifically: the louver structure 12 is distributed on both sides of the line connecting the geometric centers of the adjacent through holes 11, the louver structure 12 is turned down by the half louver 121, the upper half louver 122 and the whole louver and 123 The lines parallel to the geometric centers of the adjacent through holes 11, respectively, that is, the angle between the lower half louver 121, the upper half louver 122, and the line connecting the full louver and 123 to the geometric center of the adjacent through hole 11 a1 It is 0 °.

 The working principle of the heat exchange sheet of this embodiment is the same as that of the first embodiment.

Claims (9)

1. A heat exchange sheet for a heat exchanger, comprising a substrate (1), wherein the surface of the substrate (1) is wavy, and the substrate (1) is provided with a plurality of The through hole (11) of the refrigerant pipe is matched, and the substrate (1) is provided with a plurality of louver structures (12) around the through hole (11).
2. A heat exchange sheet for a heat exchanger according to claim 1, wherein said louver structure (12) is symmetrically distributed along a geometric center of the through hole (11) On the substrate (1).
3. A heat exchange sheet for a heat exchanger according to claim 2, wherein said louver structure (12) is symmetrically distributed in adjacent through holes (11) ) The sides of the geometric center of the line.
4. A heat exchange sheet for a heat exchanger according to claim 1, wherein said louver structure (12) is distributed in adjacent through holes (11) The sides of the geometric center of the line, the louvers of the louver structure (12) are parallel to the line connecting the geometric centers of the adjacent through holes (11).
5. A heat exchange sheet for a heat exchanger according to any one of claims 1 to 4, characterized in that the substrate (1) has a wavy cross section, and all the through holes (11) are longitudinally arranged. On the substrate (1).
6. A heat exchange sheet for a heat exchanger according to claim 5, wherein said through holes (11) are evenly arranged on the substrate (1), and all the through holes (11) The geometric centers of ) are on the same line.
7. A heat exchange sheet for a heat exchanger according to claim 6, wherein said substrate (1) is provided with a through hole (120) at a position where the louver structure (12) is mounted. The louver structure (12) is fixed to the mounting through hole (120).
8. A heat exchange sheet for a heat exchanger according to claim 7, wherein said louver structure (12) comprises a half turn down half louver (121) and a turn up half louver ( 122), the lower half louver (121) and the upper half louver (122) are respectively fixed on the side wall of the mounting through hole (120), and the half louver (121) and the upper half louver are turned down (122). Parallel to each other, the angle between the lower half of the louver (121) and the upper half of the louver (122) and the geometric centerline of the through hole (11) is between 0 ° and 90 °, and the half louver is turned down. There is a gap between the upper half and the louver (122).
9. A heat exchange sheet for a heat exchanger according to claim 8, wherein said lower half louver (121) and upturned half louver (122) and through hole (11) The geometric center line has an angle of 75 ° to 80 °, and at least one full louver (123) is provided between the lower half louver (121) and the upper half louver (122), and the whole louver (123) The two ends are fixed on the side wall of the mounting through hole (120), and the whole louver (123) is parallel with the lower half louver (121) and the upper half louver (122), and the half louver is turned down (121). There is a gap between the whole venetian (123), the upper half of the louver (122) and the whole louver (123), and between the adjacent two louvers (123).

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