JPS6335273Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to fins for a heat exchanger that are formed so that dew condensed on the surface of the fins can easily fall off.

A heat exchanger is a device that transfers thermal energy from a high-temperature fluid to a low-temperature fluid through a partition to perform heating or cooling. Heat exchangers are classified according to their structure into fin-and-tube heat exchangers. When gas flows on the outside of a heat transfer tube, the heat transfer coefficient between the heat transfer tube and the gas is small, so fin-and-tube heat exchangers are used, which have fins on the surface of the heat transfer tube to increase the heat flux.

The following types of finned tubular heat exchangers are available.

Figure 1 is a front view of the heat exchanger, Figure 2 is a sectional view taken along arrows A-A in Figure 1, Figure 3 is an enlarged view of section B in Figure 2, and Figure 4 is the same as in Figure 3. C-C arrow sectional view, 5th
The figure is an enlarged view of section D in FIG. 3. In this heat exchanger, a flat refrigerant pipe 1 is bent into a serpentine shape, and an expanded metal 2 formed by corrugate molding is used as a fin. 1 and joined. The expanded metal 2 has a bond part 3 and a strand part 4 as shown in FIG.
A diamond-shaped slit portion 5 is formed by this.

In addition, as shown in Figure 6, the cross-sectional shape of the strand portion 4' is made circular in order to reduce the pressure loss of the gas flowing around the expanded metal 2' and to improve the heat transfer coefficient between the gas and the expanded metal 2'. There is something I did.

However, when hot air is blown onto the expanded metal 2 or 2' while flowing the coolant in the refrigerant pipe 1, and the hot air is replaced with cold air as in an air conditioner, dew condenses on the surface of the expanded metal 2 or 2'. For example, as shown in FIG. 6, condensed water 6 adheres around the bond portion 3' and does not fall until it reaches a considerable size. Therefore, there are disadvantages in that the pressure loss of the air flowing around the expanded metal increases due to the dew condensation water, and the heat transfer coefficient between the air and the expanded metal decreases.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such drawbacks and provide a fin for a heat exchanger that is formed so that condensed water formed on the surface of an expanded metal can easily fall off due to gravity.

The structure of the present invention to achieve this purpose is as follows:
A reticulated heat exchanger fin composed of a needle-like strand part and a bond part in which both ends of the strand part are connected to each other, the shape of a slit part surrounded by the strand part and the bond part. of,
A pair of mutually opposing sides are formed into a hexagonal shape, each of which is substantially parallel to a vertical line.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

In the present invention, expanded metal is formed in a shape that allows condensed water to easily fall down due to gravity. In order for the dew condensation water to fall easily due to gravity, the strand portion of the expanded metal should be placed as close to parallel to the vertical line as possible. FIG. 7 shows an expanded metal 11 according to the present invention. If the direction of the arrow in the figure is the direction in which gravity is applied, the strand portion 12 and the strand portion 12
The shape of the slit portion 14 surrounded by the bond portions 13 which are connected to each other is a hexagonal shape elongated in the vertical direction. Of the sides of this hexagon, a pair of mutually opposing sides are each substantially parallel to the vertical line. By specifying the shape and direction of the slit portion 14 in this way, all the strand portions 12 are brought into a state as close to parallel to the vertical line as possible. If the angles formed by the strand parts 12 in FIG. 7 are θ' ₁ and θ' ₂ , and the angles formed by the strand parts 4 or 4' in FIGS. 5 and 6 are θ ₁ and θ ₂ , then θ' ₁ <θ ₁ , θ′ ₂ >θ ₂ .

If such an expanded metal 11 is used as a fin for a heat exchanger, since the strand portion 12 is provided along the substantially vertical direction, the dew condensation formed on the surface of the expanded metal 11 will have less influence due to the strand portion 12. It is not affected by the force of gravity, and falls easily due to the force of gravity. In particular, condensation water tends to accumulate in the bond part, but in the past, the bond part was X-shaped and had four branches, making it easy for condensation water to cling to it.In contrast, in this invention, the bond part is Y-shaped or inverted Y-shaped and has three branches. Therefore, it is difficult for condensed water to accumulate. Therefore, it is possible to reduce the pressure loss of the air flow due to dew condensation water, and to improve the heat transfer coefficient.

In the expanded metal 11' shown in FIG. 8, the cross-sectional shapes of the strand portions 12 and bond portions 13 shown in FIG. 7 are simply circularized to form strand portions 12' and bond portions 13', so a description thereof will be omitted. In addition,
14' is a slit portion.

As described above with reference to the embodiments and the drawings, according to the present invention, the shape of the slit portion surrounded by the strand portion and the bond portion is such that a pair of two mutually opposing sides are substantially parallel to the vertical line, and By forming the entire shape into a substantially hexagonal shape that is elongated in the vertical direction, the strand portion is made to be close to parallel to the vertical line, so that the condensed water that condenses on the surface of the expanded metal falls without accumulating on the expanded metal. Efficiency does not decrease due to increased air pressure loss or decreased heat transfer coefficient. Therefore, the energy required for heat exchange can be reduced.

[Brief explanation of the drawing]

Figures 1 to 6 relate to conventional heat exchanger fins, where Figure 1 is a front view of the heat exchanger, Figure 2 is a sectional view taken along the line A-A in Figure 1, and Figure 3 is a fin for a heat exchanger. An enlarged view of part B in the figure, Figure 4 is a sectional view taken along the line C-C in Figure 3, and Figure 5
The figure is an enlarged view of section D in figure 3, and figure 6 is an enlarged view of section D in figure 3.
FIGS. 7 and 8 are enlarged views showing other examples of the heat exchanger fins according to the present invention, FIG. 7 is a perspective view showing one embodiment thereof, and FIG. 8 is a perspective view showing another embodiment. FIG. In the drawing, 11 and 11' are expanded metal,
12 and 12' are strand parts, 13 and 13' are bond parts, and 14 and 14' are slit parts.

Claims (1)

[Scope of utility model registration request] A reticulated heat exchanger fin composed of a needle-like strand part and a bond part in which both ends of the strand part are connected to each other, the shape of a slit part surrounded by the strand part and the bond part. A fin for a heat exchanger, characterized in that the fins are formed into a hexagonal shape with two mutually opposing sides each substantially parallel to a vertical line.