JPH109786A - Finned heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a decrease in a heating capacity due to frost generated on heat exchanger fins for an outdoor unit at the time of a heating operation in a finned heat exchanger used for a air conditioner or a refrigerator to deliver and receive heat between a refrigerant and a fluid such as the air. SOLUTION: Louvered parts 7 protruding from a surface of a fin 5 are formed lower in height toward a downstream side of an air flow and are inclined so that the downstream side of the air flow of the parts 7 are formed lower than an upstream side of the air flow of the parts 7. Thus, water content condensed at the parts 7 is easily drained from the parts 7 via the air flow. Drain grooves 8 are provided on the film at lower rear parts of the parts 7 at the downstream side of the air flow so that the water content drained from the parts 7 easily flows down to suppress formation of frost on the fin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used in an air conditioner or a refrigeration apparatus for transferring heat between a refrigerant and a fluid such as air.

[0002]

2. Description of the Related Art In a heating operation of a heat pump type air conditioner using air as a heat source, an outdoor heat exchanger functions as an evaporator. Condense. The evaporation temperature of the refrigerant is 0
When the temperature falls below ℃, condensed water solidifies and frost is formed.
The frost increases the ventilation resistance of the heat exchanger and decreases the heating capacity. Therefore, the defrosting operation is performed periodically.

A conventional finned heat exchanger is disclosed in JP-A-59-26879. Hereinafter, an example of the conventional finned heat exchanger will be described with reference to the drawings.

FIG. 4 is a perspective view showing a conventional finned heat exchanger. In FIG. 4, reference numeral 1 denotes fins made of an aluminum material or the like, which are arranged in parallel at regular intervals, and 2 denotes copper tubes inserted at right angles to the fins 1 and arranged in the airflow direction. The copper tubes 2 are connected to each other at both ends of the heat exchanger,
This is a configuration in which an airflow flowing therebetween and a refrigerant flowing inside the copper tube 2 perform heat exchange.

FIG. 5 is a sectional view of a conventional finned heat exchanger, and FIG. 6 is a sectional view taken along line AA in FIG.

In FIG. 1, reference numeral 3 denotes a fin collar which joins the fin 1 and the copper tube 2, and reference numeral 4 denotes a slit-like cut-and-raised portion which is provided so as to protrude alternately on the fin surface. A refrigerant such as Freon circulates inside the copper tube 2, and the heat of the refrigerant is transmitted from the copper tube 2 to the fin collar 3, and the fin 1
It is cut and awakened and transmitted to 4.

[0007]

In this heat exchanger with fins, when the ambient air temperature decreases during the heating operation,
The evaporation temperature of the refrigerant decreases, and water condenses on the fin surface and the cut-and-raised portion. When the evaporating temperature of the refrigerant becomes 0 ° C. or less, the condensed water solidifies to form frost, and the frost increases the ventilation resistance of the heat exchanger and decreases the heating capacity. There was a problem that it could not be obtained.

According to the present invention, in order to prevent the heat capacity of the finned heat exchanger from decreasing, the water condensed in the cut and raised portion is easily discharged from the cut and raised portion, and the heating capacity is maintained by suppressing the formation of frost. The purpose is to:

[0009]

According to the present invention, in order to solve this problem, the height of the cut-and-raised portion is made lower toward the upstream side of the airflow, and the downstream side of the cut-and-raised portion is inclined so as to be lower than the upstream side of the airflow. By providing a drainage groove on the rear lower fin on the downstream side of the cut and raised airflow, the water condensed in the cut and raised portion is easily discharged by the airflow. Thereby, the effect of suppressing frost on the fin surface and maintaining the heating capacity can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to an air flow system in which fins are arranged in parallel at regular intervals and gas flows between the fins, and a fluid flows through the fins and flows inside. And copper tubes arranged in multiple rows in the direction,
A slit-shaped cut-and-raised portion is provided on the surface of the fin so as to be inclined toward the airflow direction, so that the airflow downstream side of the cut-and-raised portion is lower than the airflow upstream side, and the height of the cut-and-raised portion is lower toward the airflow downstream side. Further, a finned heat exchanger provided with a drain groove on the fin at the rear lower portion on the downstream side of the airflow of the cut-and-raised portion, so that moisture condensed in the cut-and-raised portion during heating operation is easily discharged from the cut-and-raised portion. In addition, there is an effect that the heating capacity can be maintained by suppressing the formation of frost.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is a cross-sectional view of a finned heat exchanger according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line BB of FIG. 1, and FIG. 3 is a perspective view showing the cut and raised shape of FIG. It is.

In FIG. 1, reference numeral 2 denotes a copper tube which is the same as a conventional structure. Numerals 5 are fins arranged in parallel at regular intervals. Gas flows between the fins, and the refrigerant flowing in the copper tube 2 and the airflow flowing between the fins 5 exchange heat. A fin collar 6 joins the fin 5 to the copper tube 2. Numeral 7 denotes a cut-and-raised portion, which alternately protrudes from the front of the fins 5 so that the cut-and-raised height is lower toward the downstream side of the airflow, and the downstream of the cut-and-raised portion is inclined lower than the upstream side of the airflow. Flowing air and copper tube 2
This has the effect of promoting heat exchange of the refrigerant flowing inside and easily discharging water condensed by the heat exchange. Numeral 8 denotes a drainage groove, which is provided on the lower rear fin on the downstream side of the cut-and-raise air flow, and has an effect of making it easier to flow down the water discharged from the cut-and-raise.

The operation of the finned heat exchanger configured as described above will be described below.

In FIG. 1, heat from a refrigerant circulating in the copper tube 2 is transmitted to the cut-and-raised portion 7 through the copper tube 2, the fin collar 6, and the fin 5. At this time, heat exchange is performed between the airflow flowing between the fins 5 and the cut-and-raised portion 7,
Water drops condense on the cut-and-raised 7. The condensed water droplets are cut and raised by the airflow and are pushed down the airflow downstream of the airflow 7, and the pushed waterdrops flow down on the fins 5 through the drain grooves 8.
For this reason, it is difficult for water droplets to remain on the cut-and-raised portion 7, formation of frost can be suppressed, and the heating capacity can be maintained.

[0016]

As described above, according to the present invention, the formation of frost on the fins of the outdoor-unit-side heat exchanger during the heating operation can be suppressed, and the heating capacity can be maintained. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a finned heat exchanger according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB in FIG.

FIG. 3 is a perspective view showing a cut-and-raised shape of the embodiment.

FIG. 4 is a perspective view of a conventional finned heat exchanger.

FIG. 5 is a cross-sectional view of a conventional finned heat exchanger.

6 is a sectional view taken along line AA in FIG.

[Explanation of symbols]

 2 Copper pipe 5 Fin 7 Cut and raised 8 Drain

Claims (1)

[Claims] 1. A fin comprising a plurality of fins which are arranged in parallel at regular intervals and through which gas flows, and a plurality of rows of copper tubes which penetrate the fins and through which the fluid flows, are arranged in the gas flow direction, A slit-shaped cut-and-raised portion is provided on the surface of the fin so as to be inclined toward the airflow direction, so that the airflow downstream side of the cut-and-raised portion is lower than the airflow upstream side, and the height of the cut-and-raised portion is lower toward the airflow downstream side. And a finned heat exchanger further comprising a drain groove provided on the fin at a lower rear portion on the downstream side of the cut and raised airflow.