KR100629283B1 - Heat Exchange Fin - Google Patents

Abstract

The present invention forms a plurality of slits formed in the fin of the heat exchanger used in the air conditioner and the refrigerator to have an inclination angle, thereby maximizing the thermal boundary layer tip effect and the turbulent mixing effect, and minimizing the drop in the heat exchange air pressure to maximize the heat transfer performance. Relates to a heat exchanger fin.

In the prior art structure, since the loop of the slit is formed on a flat horizontal plane, since the air moves horizontally and induces, there is a problem in that the flow of air cannot be induced and mixed in the wake region.

The present invention is a conventional heat exchanger composed of a plurality of fins and a refrigerant pipe,

A plurality of slits are formed in the fins, and the loops are formed as inclined surfaces having a predetermined elevation angle α with respect to the inflow air flow at the inlet side of the heat exchanger.

The inclination angle α of the slit loop is formed in a range of 5 to 20 ° based on a horizontal plane, and the ratio of the width w and the height h of the slit is formed to be 1.5 or more.

Description

Heat Exchanger Fins {Heat Exchange Fin}             

1 is a block diagram of a heat exchanger according to the prior art,

a is a partial perspective view,

b is an enlarged view of a portion of section A-A in FIG.

Figure 2 is an operational state diagram showing the flow of air in the prior art.

3 is a partial perspective view of a heat exchanger fin according to a preferred embodiment of the present invention.

4 is a perspective view of FIG. 3;

a degree is the front view,

b is a plan view,

Figure c is a cross-sectional view taken along the line A-A in Figure a.

5 is an operational state diagram showing a flow state of air according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: heat exchanger 2: inlet air flow

3: heat boundary layer 4: horseshoe vortex

5; Liquid Peeler 10: Prior Art Fin

11: slit 12: pin base

13: Wake zone 20: Refrigerant pipe

100: pin 110 of the present invention: pin base

120: slit 121: loop of the slit

The present invention relates to a heat exchanger fin (Fin) structure used in air conditioners, refrigerators, in particular by forming a plurality of slits formed in the fin having an inclination angle,

The present invention relates to a heat exchanger fin that maximizes thermal boundary layer tip effect and turbulent mixing effect, and minimizes a drop in heat exchange air pressure to maximize heat transfer performance.

An air conditioner or a refrigerator is provided with a heat exchanger which consists of a refrigerant pipe through which fluid for heat exchange flows, and a plurality of heat exchange fins through which the refrigerant pipe is inserted.

1 is a configuration diagram of such a heat exchanger, in which a is a perspective view, and b is an enlarged view of a portion of the cross section along the line A-A in FIG.

As shown in FIG. 1, a general heat exchanger 1 has a plurality of fins 10 arranged at regular intervals in parallel to each other and arranged in two rows of zigzag perpendicular to the fin base 12. The refrigerant pipe 20 through which the refrigerant flows is expanded,

On each fin 10 there are provided a number of flat slits 11 of constant height from the pin base 12,

The slit 11 is a slit 1 (11a) positioned perpendicular to the flow direction in the lateral symmetry of the refrigerant pipe 20, and a horseshoe-shaped vortex generated near the coolant tube near the flow stagnation point in front of the refrigerant pipe 20. Slit 2 (11b) for crushing and slit 3 (11c) for evenly distributing the flow between the refrigerant pipe (20).

The constant temperature air flow to the heat exchanger inlet heat transfers between the fins and the fins and the thermal boundary layer gradually develops from the fin front.

The thermal boundary layer increases with increasing distance from the fin front, and the heat transfer coefficient also decreases with half the distance.

The prior art structure consists of an array of flat slits that breaks the thermal boundary layer by making the slits in place, and utilizes the thermal boundary layer tip effect.

2 is an operational state diagram showing an air flow state in the prior art.

As shown in FIG. 2, the conventional technology is that the loop of the slit is formed on a flat horizontal plane, so that the horseshoe vortex whose flow form is generated around the refrigerant pipe from the flow stagnation point in front of the refrigerant pipe is the air flowing around the refrigerant pipe. The flow is separated from the surface of the coolant tube, and this flow separation causes a rapid decrease in the heat transfer coefficient in the downstream region of the coolant tube.

The problem is that a plurality of slits formed horizontally at a certain height symmetrically on the left and right sides of the refrigerant pipe are arranged perpendicular to the flow direction, and the loops are formed horizontally, so that the flow of air cannot be guided and mixed into the wake region. Because of

Therefore, there was a problem that the heat exchange efficiency is lowered and the heat transfer performance is lowered.

The present invention has been made to solve the above problems, an object of the present invention, to maximize the thermal boundary layer tip effect and turbulent mixing effect on the slit formed in a plurality of heat exchanger fin (Fin) used in air conditioners, refrigerators and the like. By giving the inclination angle,

It is to provide a heat exchanger fin to smooth the flow of air passed between the fins to minimize the heat exchange air pressure drop due to the flow loss, and to maximize the heat transfer performance.

Heat exchanger fin according to the present invention to achieve the above object,

A plurality of fins in which a plurality of slits are formed are arranged in parallel at predetermined intervals, inserted at right angles to each of the fins, and a plurality of refrigerant tubes through which refrigerant fluid passes through are arranged in a direction perpendicular to the passage direction of air. In

A plurality of slits formed in the fin is characterized in that the loop (Roof) is formed in the inclined surface to form a predetermined angle (Angle of Attack) with respect to the inlet air flow on the heat exchanger inlet side,

The inclination angle α of the slit loop is formed in a range of 5 to 20 ° based on the horizontal plane, and the ratio of the width w and the height h of the slit is formed to be 1.5 or more.

Hereinafter, preferred embodiments of the heat exchanger fin of the present invention will be described in more detail with reference to the accompanying drawings.

3 is a perspective view showing an extract of one portion of a plurality of slits formed in the pin according to a preferred embodiment of the present invention, Figure 4 is a perspective view of Figure 3, a is a front view, b is a plan view, c FIG. 5 is a cross-sectional view taken along line AA of FIG. A, and FIG. 5 illustrates a flow of air according to the present invention.

As shown in Figure 3 to 5, the heat exchanger fin according to a preferred embodiment of the present invention,

A plurality of fins in which a plurality of slits are formed are arranged in parallel at predetermined intervals, are inserted at right angles to each of the fins, and a plurality of coolant tubes 20 in which a refrigerant fluid passes therethrough are disposed at right angles to the passage direction of air. In one heat exchanger,

A plurality of slits 120 formed in the fin 100 form the roof 121 as an inclined surface that forms a predetermined angle of attack α with respect to the inflow air flow 2 at the inlet side of the heat exchanger. To direct the air flow toward the pin base 110.

The inclination angle α of the slit loop 121 is formed in a range of 5 to 20 ° with respect to the horizontal plane, in order to avoid the flow separation in the slit loop 120 due to the excessive inclination angle, and the width (w) of the slit 120 and The ratio of the height h is preferably formed to be w / h 1.5 or more in order to reduce the flow air pressure drop, so as to lower the overall height.

The loop 121 of the slit 10 is preferably formed of a light beam lower narrow.

Look at the working state of the present invention according to the above configuration.

The inclination angle is given to the slit 120 of the heat exchanger fin 100, but in particular, the loop 121 of the slit is configured to have an inclination angle with respect to the heat exchanger inlet-side air flow 2, so that the flow of air is fin base 110. By directing it toward), thereby smoothing the flow of air passing between the fins 100.

Therefore, the pressure drop of the air flow for heat exchange is minimized, and the heat exchange proceeds more efficiently, and at the same time, the horseshoe vortex generated around the refrigerant pipe 20 is directed to the fin base surface 110, thereby preventing the fluid peeling phenomenon. The thermal boundary layer to prevent the front end action, and thus heat exchange is effectively performed in the wake region behind the refrigerant pipe (20).

In addition, the slanted slant 120 increases the amount of heat transfer by mixing the air near the loop 121, which is relatively low temperature, with the air on the surface of the fin as the air flow passes through the fin 100,

Part of the airflow passing through the slit 120 promotes heat transfer at the bottom surface of the fin 100 through the slit, and mixes with the flow air through the upper loop 121 of the stacked fins, thereby providing air above and below the fin. By effectively mixing the flows, an even heat transfer distribution can be obtained.

On the other hand, by adjusting the inclination angle and the ratio of the width (w) to the height (h) of the slit can adjust the heat transfer amount and the pressure loss due to the slit.

 As described in detail above, the heat exchanger fin according to the present invention,

In the heat exchanger fin structure and arrangement used for air conditioners and refrigerators, by giving an inclination angle to a plurality of slits formed in the fins to maximize the thermal boundary layer tip effect and turbulent mixing effect without increasing the number of slits,

By smoothing the flow of the heat exchange air, the pressure drop of the heat exchange flow air is minimized, and the cooling action is effectively performed, thereby maximizing the heat transfer performance.

Claims (2)

delete A plurality of fins in which a plurality of slits are formed are arranged in parallel at predetermined intervals, inserted at right angles to each of the fins, and a plurality of refrigerant tubes through which refrigerant fluid passes through are arranged in a direction perpendicular to the passage direction of air. In A plurality of slits formed in the fins form a roof having an inclined surface that forms an angle of attack α in a range of 5 to 20 ° with respect to a horizontal plane with respect to the inflow air flow at the inlet side of the heat exchanger. The heat exchanger fin characterized in that the ratio (w / h) of (w) to height (h) is formed to be 1.5 or more.

Images