JPH0252200B2 - - 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 5.

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 having a large number of stages of refrigerant pipes in the airflow direction, there is a problem that the fins cannot be used effectively because of the dead area formed on the downstream side of the refrigerant pipes. .

That is, as shown in FIG. 6, 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.

SUMMARY OF THE INVENTION 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.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention constructs a refrigerant flow path by laminating a plurality of flat plate members at appropriate intervals, and the flat refrigerant flow path A large number of fin members parallel to the airflow direction are attached to the outer wall of the flat refrigerant flow path.

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 the fins are not affected by dead areas and can be used effectively. Heat exchange takes place.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In FIG. 1, reference numeral 5 denotes a flat refrigerant flow path, which is arranged parallel to the air flow direction. 6 is L
These are letter-shaped fin members, and a large number of them are attached to the outer wall of the flat refrigerant flow path 5 so as to be almost parallel to the air flow direction.The pitch P of the fin members 6 is set as the windward side becomes larger, considering the frost formation phenomenon. It is set to be large. Further, 7 and 8 are an inlet pipe and an outlet pipe connected to the flat refrigerant flow path 5.
Note that arrow 9 indicates the airflow direction, and arrow 10 indicates the flow direction of the refrigerant.

FIG. 2 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 a refrigerant inlet pipe 7 and an outlet pipe 8 is laminated, and outer wall members 15 serving as outer walls of the refrigerant flow path are laminated and integrated on both upper and lower surfaces thereof. By doing so, a flat refrigerant flow path 5 is configured.

In the heat exchanger configured in this manner, the airflow smoothly flows along the flat refrigerant flow path 5 and between the fin members 6, and exchanges heat with the refrigerant flowing within the flat refrigerant flow path 5. I do. 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. Further, even during frost formation, a frost layer can be formed relatively uniformly over the entire surface of the fins 6, so that it is possible to prevent the airflow passage from being blocked due to a portion of the fins.

Further, in the above embodiment, the L-shaped fin member 6 was attached to the outer wall of the flat refrigerant flow path 5;
The present invention is not limited to this, and even if a corrugated fin member 16 is used as shown in FIG. 3, the same effect can be obtained.
In this case, manufacturing becomes easier.

In addition, since a plurality of parallel refrigerant flow paths are configured using the flow path member 12 and the header member 14 to configure the flat refrigerant flow path 5, the thickness of the flow path member 12 and the header member 14 is Even if it is made very thin, the flow resistance of the refrigerant can be reduced, and since the thickness of the entire flat refrigerant flow path 5 can be reduced, the ventilation resistance on the airflow side can also be reduced.

Furthermore, since the flat refrigerant flow path 5 is adopted as described above, the fin members can be installed in finely divided stages in the airflow direction, thereby improving heat transfer performance such as the leading edge effect of the boundary layer. Or, for improving performance such as preventing blockage of airflow passages during frost formation.
This eliminates the constraining conditions.

FIG. 4 is an exploded view of a different embodiment of the flat refrigerant flow path 5, in which a flow path member 18 is provided with a plurality of slits 17 serving as refrigerant flow paths, and the plurality of slits 17 are made to communicate with each other. , are stacked so as to be sandwiched by a header member 20 provided with a header 19 for attaching the refrigerant inlet pipe 7 and outlet pipe 8, and further, outer wall members 15 serving as outer walls of the refrigerant flow path are stacked and integrated on both upper and lower surfaces thereof. By doing so, a flat refrigerant flow path is constructed.

In this case, since the header members 20 are laminated on both sides of the flow path member 18, the flow path area in the header portion can be increased, and the pressure loss of the refrigerant can be extremely reduced. Since the flow is counter-current, the temperature difference can be utilized as effectively as possible. Moreover, since a plurality of parallel refrigerant flow paths are configured, even if the thickness of the flow path member 18 and the header member 20 is made very thin, the flow resistance of the refrigerant is extremely small. Since the thickness of the entire structure 5 can be reduced, the ventilation resistance on the airflow side can also be reduced.

Effects of the Invention The present invention configures a refrigerant flow path by laminating a plurality of flat plate members at appropriate intervals, arranges the flat refrigerant flow path parallel to the airflow direction, and Since it is constructed by attaching a large number of fin members parallel to the airflow direction to the outer wall of the refrigerant flow path, the dead area of the refrigerant flow path does not have any negative effects on the fins, and the fins can be used effectively to improve transmission. Thermal performance can be improved. In addition, since the refrigerant flow path is made into a thin flat plate, the ventilation resistance on the airflow side is reduced, and there are no restrictions on the fin member configuration, which improves the heat transfer performance of the fins and improves the airflow path during frost formation. This has great practical effects, such as being able to sufficiently improve performance such as preventing blockages.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a heat exchanger according to an embodiment of the present invention, Fig. 2 is an exploded perspective view of a flat plate-shaped member constituting a plate-shaped refrigerant flow path, which is a component of the heat exchanger, and Fig. 3 is a perspective view of a fin member according to another embodiment of the present invention, FIG. 4 is an exploded perspective view of a different embodiment of a flat plate member constituting the flat refrigerant flow path of the heat exchanger, and FIG. 5 is a perspective view of a conventional fin member. FIG. 6 is a block diagram showing a heat exchanger, and FIG. 6 is a partial diagram of the heat exchanger. 5... Flat refrigerant channel, 6... Fin member, 1
2... Channel member, 14... Header member, 15...
...Outer wall components.

Claims (1)

[Scope of Claims] 1. A plurality of plate-shaped members are stacked at appropriate intervals to form a refrigerant flow path in a direction perpendicular to the stacking direction, and the flat refrigerant flow path is arranged parallel to the air flow direction. In addition, a heat exchanger configured by attaching a plurality of fin members parallel to the air flow direction to the outer wall of the flat refrigerant flow path. 2 A flat flow path member provided with a plurality of slits serving as a refrigerant flow path is stacked so as to be sandwiched between header members provided with a header that communicates the slits with each other, and furthermore, an outer wall of the refrigerant flow path and an outer wall of the refrigerant flow path are provided on both upper and lower surfaces of these flow path members. The flat refrigerant flow path is formed by laminating and integrating outer wall members, and the flat refrigerant flow path is formed by:
2. The heat exchanger according to claim 1, wherein a large number of fin members are arranged parallel to the airflow direction and attached to an outer wall of the flat refrigerant flow path in parallel to the airflow direction. 3. Claim 1, in which the flow direction of the refrigerant in the flat refrigerant flow path is configured to be opposite to the air flow direction.
Heat exchanger as described in section. 4. A third aspect of the present invention, characterized in that a plurality of fins are formed in the airflow direction on the flat refrigerant flow path forming member, and the number of fins in the fin row on the upstream side of the airflow is smaller than that on the downstream side. Heat exchanger as described in section.