JPS61140790A - Refrigerant vaporizer - Google Patents

Abstract

PURPOSE:To improve the heat exchanging performance of heat conducting fins of a refrigerant vaporizer by disposing louvers of the refrigerant vaporizer parallelly to the airflow through the space between flat tubes and heat conducting fins, the end of the louvers pointing downward when the refrigerant vaporizer is set in place. CONSTITUTION:A heat conducting fin 2 has multiple folded-up louvers 20 which are pointing downward in regard to the direction of gravity and are disposed parallelly to the airflow direction A entering into a refrigerant vaporizer. Therefore, the codensate attached to the louvers 20 drops downward by its gravity, and, since they are parallel to the airflow A, the water is easily drained and the louvers 20 have more surface area that is exposed to the ambient air. Further, because of the parallel arrangement with the airflow A, dead water spots are eliminated, and the drafting air is effectively cooled by all of the louvers 20 and heat conducting fins 2. In addition, since the louvers 20 not become the drafting resistance, the airflow rate can be increased, and so, the cooling effect can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a refrigerant evaporator of a refrigeration cycle device that performs cooling and freezing.

[Conventional technology]

FIG. 5 shows the appearance of a conventionally known refrigerant evaporator, and this type of refrigerant evaporator is often used in automobile cooling systems that cool the surrounding air and cool the interior of a vehicle.

In Fig. 5, reference numeral 1 denotes a flat tube made of aluminum formed into a meandering shape, and a large number of refrigerant passages 1a are formed inside the tube as shown in Fig. 6, and the refrigerant passes through the refrigerant passages 1a. When doing so, it performs an evaporation action. An inlet vibrator 3 for introducing the refrigerant is connected to one end of the flat tube l, and an outlet vibrator 4 for leading out the refrigerant is connected to the other end by brazing.

In addition, between the flat tubes 1 formed in a meandering shape, corrugated aluminum heat transfer fins 2 are fixedly brazed to the flat tubes 1 in order to promote heat exchange with the surrounding air. ing.

In order to further promote heat exchange, the heat transfer fins 2 are provided with a large number of louvers 2a by cutting and bending, as shown in FIG.

In the refrigerant explosion device configured as described above, FIG.
When air flows in from this direction, when the air passes between the flat tube 1 and the heat transfer fins 2, heat is removed by evaporation of the refrigerant and the air is cooled. Moreover, since the heat transfer fins 2 are provided with a large number of louvers 2a, the heat transfer fins 2
heat exchange on the surface is promoted, resulting in greater cooling capacity.

[Problem that the invention seeks to solve]

1. Conventional refrigerant evaporators can achieve a large cooling capacity in part by promoting heat exchange, but the present invention has revealed that they have the following problems.

First, as is well known, when the refrigerant evaporates within the flat tube 1, the latent heat of evaporation is taken away and the surfaces of the flat tube 1 and the heat transfer fins 2 are cooled. Therefore, when ambient air comes into contact with this cooled surface, the air is cooled and moisture in the air condenses on the surfaces of the flat tube 1 and the heat transfer fins 2, becoming condensed water. Therefore, in the conventional evaporator described above, since the heat transfer fins 2 are provided with the louvers 2a,
As shown in FIG. 7 which is a schematic sectional view of FIG. 6 vr-v+,
Water droplets condensed on the surface of the heat transfer fins 2 flow along the inclination of the louver 2a in the direction indicated by the arrow. Therefore, some of the water droplets 5 accumulate in the horizontal movement louvers 2b with respect to the direction of gravity, which causes a decrease in heat transfer coefficient and an increase in conduction resistance to prevent flow between the louvers 2a.

In addition, the hatched area (■@○) in FIG. 7 becomes a dead area where no wind flows, and the area where heat exchange is actually performed is reduced.

Therefore, the technical problem to be solved by the present invention is to improve the heat exchange performance in the heat transfer fins of the refrigerant evaporator by improving the looper portion of the refrigerant evaporator.

[Means for solving problems]

In order to achieve the technical goal, the louver of the refrigerant evaporator is installed parallel to the wind flow between the flat tube and the heat transfer fins, and the tip of the louver is installed in the refrigerant evaporator. A technical measure will be adopted in which a louver will be provided so that it protrudes downward in a closed state.

[For production]

By employing the above technical means, the condensed water generated at the heat transfer fin portions does not accumulate in the louver and falls downward.

Additionally, since the louvers are parallel to the wind flow, there are no dead zones and all heat transfer fins and louvers provide a cooling effect to the air that is passed around them.

〔Effect of the invention〕

Therefore, according to the present invention, the louver has good draining properties for condensed water and no condensed water accumulates on the louver, and the louver portion is exposed to the surrounding air.
Effective heat exchange can be performed in the louver portion.

Furthermore, since the louvers are parallel to the flow of air flowing into the refrigerant evaporator, ventilation resistance can be reduced. In addition, since there is no dead area, all the heat transfer fins and louvers perform a cooling effect on the surrounding ventilation air, and the cooling ability of the surrounding air as a whole of the refrigerant evaporator is improved compared to the conventional method.

〔Example〕

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

Since the overall configuration of the refrigerant evaporator is the same as that of the conventional example shown in FIG. 5, the explanation will be omitted, and only the louver portion will be explained in detail in this embodiment.

1 and 2 show a first embodiment of the present invention, in which a plurality of louvers 20 are provided on a heat transfer fin 2 by cutting and bending. As can be seen from FIG. 1, the tip of the louver 20 projects directly downward with the refrigerant evaporator installed, that is, vertically downward in the direction of gravity.

Moreover, as can be clearly seen from FIG. 2, the louver 20 is provided parallel to the inflow direction A of the wind flowing into the refrigerant evaporator.

Therefore, the condensed water adhering to the louver 20 falls downward due to gravity, and since it is parallel to the wind flow A, the water draining property is good, and the surface of the louver 20 is more susceptible to the surrounding air than in the past. The exposed area increases. Moreover, since it is parallel to the wind flow A, there is no dead area, and all the louvers 20 and heat transfer fins 2 effectively cool the ventilation air. Further, since the louver 20 does not act as a ventilation resistance as in the conventional case, the amount of air is increased, and the cooling effect is also improved.

Next, a second embodiment of the present invention will be described.

In the second embodiment, as shown in FIG. 3, the shape of the louver 21 provided by cutting and bending is triangular, so that water droplets can easily fall from the tip 01iii of the louver 21.

Next, a third embodiment of the present invention will be described.

In the second embodiment, as shown in FIG.
In this example, the louver 22 is provided by cutting and raising the louver 22.
The cut-and-raise angle θ is not necessarily 90° downward with respect to the horizontal direction, but if it is tilted at a certain angle, condensed water will flow down to the lower blade through the louver 22.

In addition, in the third embodiment, the surface area of the louver 22 can be increased compared to the first and second embodiments.
The tip effect of 2 can be increased and the heat transfer efficiency can be improved.

In addition, according to the embodiment mentioned above, the louvers 20, 21° 22
are set up by cutting and raising, but in addition to this,
It goes without saying that a louver separate from the fins 2 may be joined by brazing, etc. to enable heat conduction.

[Brief explanation of drawings]

FIG. 1 is an enlarged perspective view of essential parts of a refrigerant evaporator showing a first embodiment of the present invention, FIG. 2 is a schematic sectional view of FIG. 1, and FIG. 3 is a refrigerant evaporator showing a second embodiment of the present invention. 4 is an enlarged perspective view of a main part of a refrigerant evaporator showing a third embodiment of the present invention; FIG. 5 is a perspective view of a conventional refrigerant evaporator and a refrigerant evaporator according to the present invention; FIG. The figure is an enlarged view of essential parts of a conventional refrigerant evaporator, and FIG. 7 is a schematic sectional view taken along the line Vl--Vl in FIG. 6. ■...Flat tube, 2...Heat transfer fin, 20,2
1.22...Luba.

Claims (1)

[Claims] A refrigerant comprising a flat tube having a plurality of refrigerant passages, a heat transfer fin connected to the flat tube in a heat conductive manner, and a louver provided on the heat transfer fin in a heat conductive manner. In the evaporator, the louver is provided parallel to the flow of air flowing between the flat tube and the heat transfer fin, and a tip of the louver projects downward when the refrigerant evaporator is installed. A refrigerant evaporator characterized in that it is provided to do so.