JPH0222319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an evaporator heat exchanger mainly used in refrigerators.

Conventional technology A conventional heat exchanger of this type is, for example,
As shown in Publication No. 120889, it had a structure as shown in Figure 4.

That is, it is composed of a large number of fins 1 arranged in parallel, and refrigerant pipes 2 that pass through the fins 1 perpendicularly, and the air is blown in the direction of the arrow 3.
Heat exchange is performed with the refrigerant flowing in the refrigerant pipe 2.

Problems to be Solved by the Invention However, in a heat exchanger with such a large number of stages of refrigerant pipes in the airflow direction, there was a problem in that the fins were not used effectively because of the dead area formed on the downstream side of the refrigerant pipes. .

That is, as shown in FIG. 5, a dead area 4 is formed on the downstream side of each refrigerant pipe 2. Therefore, the portion of the fin 1 corresponding to this portion has very poor heat transfer and does not work effectively, and therefore has low heat transfer performance. Furthermore, when used in a high humidity stream, such as in a refrigerator evaporator, frost formation occurs. In this frosting phenomenon, the amount of frost is large in areas with good heat transfer, and the amount of frost is small in areas with poor heat transfer.
Therefore, the part corresponding to the dead area 4 of the fin 1,
Differences in the amount of frost in other parts become larger. Therefore, compared to the case where frost forms uniformly, the air passage becomes blocked in areas where a large amount of frost forms in a short period of time, making it necessary to stop operation and defrost.

In addition, with the conventional structure in which the fins 1 are fixed to the refrigerant pipes 2, it is possible to divide the fins in the airflow direction more than the number of stages of the refrigerant pipes in the airflow direction, change the fin spacing, improve performance, or It was not possible to improve performance during frost.

Therefore, the present invention provides a heat exchanger structure that prevents the formation of a dead area on the downstream side of a refrigerant flow path and that can improve performance by dividing the fins or the like.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention includes a plurality of flat refrigerant flow channels laminated at appropriate intervals, and a plurality of flat refrigerant flow channels. are arranged parallel to the airflow direction, and a plurality of fin members are attached to the outer wall of the flat refrigerant flow path in parallel to the airflow direction, the spacing being narrower toward the downstream side of the airflow, and the dimension in the airflow direction being longer. It is.

Effects According to the present invention, the refrigerant flow path has a flat plate shape and is arranged parallel to the air flow direction, so that there is no negative effect of dead areas on the fins, and the frosting phenomenon is taken into account. Adopting a fin arrangement that prevents air passages from becoming clogged, it is possible to continue operation for long periods of time.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

FIG. 1 is a plan view showing the structure of the heat exchanger of the present invention, and FIG. 2 is a front view. On both sides, reference numeral 5 denotes a flat refrigerant flow path, which is arranged parallel to the airflow direction. Reference numeral 6 denotes a fin member, which includes a plurality of fin members 6a, 6b, 6c, which are divided such that the distance is narrower toward the downstream side of the airflow, and the dimension in the airflow direction becomes longer.
6d, and is attached to the outer wall of the flat refrigerant flow path 5 so as to be substantially parallel to the airflow direction. Further, 7 and 8 are an inlet pipe and an outlet pipe connected to the flat refrigerant flow path 5. In addition, arrow 9
indicates the airflow direction, and arrow 10 indicates the flow direction of the refrigerant.

FIG. 3 is an exploded perspective view of a flat member constituting the flat refrigerant flow path 5, in which a flow path member 12 is provided with a plurality of slits 11 serving as refrigerant flow paths, and the plurality of slits 11 are connected to each other. In addition, a header member 14 provided with a header 13 for attaching the refrigerant inlet pipe 7 and outlet pipe 8 is laminated, and furthermore, outer wall members 15 serving as outer walls of the refrigerant flow path are laminated and integrated on both upper and lower surfaces thereof. This constitutes a flat refrigerant flow path 5.

In the heat exchanger configured in this manner, the airflow enters from the refrigerant inlet pipe 7 along the flat refrigerant flow path 5 and smoothly flows between the fin members 6, and is divided by the header 13. Heat exchange is performed with the refrigerant flowing in the slit 11 opposite to the airflow direction. Therefore, the fins are not adversely affected by the dead area of the refrigerant flow path, and the fins can be effectively utilized to improve heat transfer performance.

In addition, in areas with wide fin spacing that can be regarded as flow on a single plane, the dimension in the flow direction is shortened to improve the average heat transfer coefficient, and in narrow areas between fins that are similar to flow between parallel plates, Since the size in the flow direction is increased to increase the heat transfer area, the airflow passage is prevented from being blocked by frost formation, and high performance is achieved.

Effects of the Invention The present invention comprises a plurality of plate-shaped refrigerant flow paths stacked at appropriate intervals, and the flat refrigerant flow paths are arranged parallel to the airflow direction, and Since a plurality of fin members are attached to the outer wall of the flat refrigerant flow path in parallel to the air flow direction, the spacing is narrower toward the downstream side of the air flow, and the dimensions in the air flow direction are longer. By improving the average heat transfer coefficient of the fins and expanding the heat transfer area without any adverse effects on the fins, it is possible to simultaneously prevent airflow passages from being blocked due to frost formation and improve heat transfer performance. Furthermore, since the refrigerant flow path is formed into a thin flat plate, the ventilation resistance on the airflow side is also reduced, which provides great practical effects.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the configuration of a heat exchanger according to an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is an exploded perspective view of a flat refrigerant flow path, and Fig. 4 is a conventional heat exchanger. A block diagram showing the exchanger, and FIG. 5 is a partial view of the same. 5... Flat refrigerant channel, 6, 6a, 6b, 6
c, 6d...Fin member, 11...Slit, 1
2... Channel member, 13... Header, 14... Header member, 15... Outer wall member.

Claims (1)

[Claims] 1. A plurality of plate-shaped refrigerant flow paths are stacked at appropriate intervals to form a flat refrigerant flow path, and the flat refrigerant flow path is arranged parallel to the airflow direction, and the flat refrigerant flow path is arranged parallel to the air flow direction. A heat exchanger in which a plurality of fin members are attached to an outer wall in parallel to the airflow direction, and the spacing is narrower toward the downstream side of the airflow, and the dimensions are longer in the airflow direction.