JPS61243280A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent formation of dead water area in the wake flow side of a refrigerant flow path and increase the performance of the heat exchanger by splitting or the like of fins by a method wherein the flat plate type refrigerant flow paths, constituted by laminating a plurality of flat plate members, are arranged in parallel to the direction of air stream and a plurality of fin members, parallel to the direction of air stream, is attached to the outer walls of the refrigerant flow paths. CONSTITUTION:The flat plate type refrigerant flow path 5 is constituted of a flow path member 12, a header member 14, communicating a plurality of slits 11 mutually and provided with headers 13 to which the inlet pipe 7 and the outlet pipe 8 of refrigerant are attached, and outer wall members 15, which are laminated and integrated. A plurality of L-shaped fin members 6 are attached to the outer walls of the refrigerant flow path 5 so as to be in parallel to the direction of air stream 9 substantially while the pitch P of the fin members 6 is designed so as to be larger at the upstream side of the airflow under considering the frosting phenomenon. Air flows smoothly between the fin members 6 along the refrigerant flow path 5 and exchanges the heat thereof with the heat of the refrigerant, flowing in the refrigerant flow path 5, without being adversely affected by the dead water area of the refrigerant flow path and, therefore, the fins may be utilized effectively and the heat transfer performance of the heat exchanger may be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an evaporator heat exchanger used primarily in refrigerators.

2. Description of the Related Art A conventional heat exchanger of this type is disclosed in, for example, Utility Model Application No. 57-120.
As shown in Japanese Patent No. 889, it had a structure as shown in FIG. 1.

In other words, a large number of parallel fins/1 and these fins 1
The refrigerant pipe 2 is constructed of a refrigerant pipe 2 that passes through the refrigerant pipe perpendicularly to the refrigerant pipe 2, and heat exchange is performed between the air blown in the direction of the arrow 3 and the refrigerant flowing inside 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 in 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 function effectively, and therefore has low heat transfer performance. Also, when used in high humidity streams such as refrigerator evaporators,
A frosting phenomenon 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 difference in the amount of frost between the part corresponding to the dead area 4 of the fin 1 and the other parts becomes large. Therefore, compared to the case where frost forms uniformly, the air is absorbed in areas where a large amount of frost forms in a short period of time. There were cases where the passage was blocked and it was necessary to stop the operation and defrost it.
With a structure that fixes the refrigerant, it was not possible to divide the fins in the airflow direction beyond the number of stages of refrigerant pipes in the airflow direction, change the fin spacing, improve performance, or improve performance during frost formation. .

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

Means for Solving the Problems In order to solve the above problems, the present invention constructs a refrigerant flow path by stacking a plurality of flat plate-like members at appropriate intervals, and the flat refrigerant flow path is arranged in the air flow direction. Along with parallel placement,
A large number of fin members parallel to the airflow direction are attached to the outer wall of the flat refrigerant flow path.

Effects The present invention has the above-described configuration, and since the refrigerant flow path is flat and arranged parallel to the air flow direction, the fins are not affected by dead areas and can be used effectively. Heat exchange takes place.

Embodiment Hereinafter, one 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. Reference numeral 6 denotes an L-shaped fin member, 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 pipes are set to become thicker toward the top, and 7.8 is an inlet pipe and an outlet pipe connected to the flat refrigerant flow path 6.

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 communicated with each other. In addition, the refrigerant inlet pipe7. By stacking the header member 14 provided with the header 13 to which the outlet pipe 8 is attached, and further stacking and integrating the outer wall members 16 that serve as the outer wall of the refrigerant flow path on both upper and lower surfaces, the flat refrigerant flow path 5 is formed. It consists of

In the heat exchanger configured in this way, the airflow flows smoothly along the flat refrigerant flow path 5 and between the fin members 6, and the refrigerant and heat flowing inside the flat refrigerant flow path 5 are combined. Make an exchange. 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 when frost forms, a frost layer can be formed relatively uniformly over the entire surface of the fins, so that it is possible to prevent the airflow passages from being blocked due to a portion of the fins.

Further, in the above embodiment, the L-shaped fin member 6 is attached to the outer wall of the flat refrigerant flow path 5, but the present invention is not limited to this, and as shown in FIG. also has a similar effect, and in this case, manufacturing becomes easier.

Further, in order to configure the flat refrigerant flow path 5, the flow path member 12
and the header member 14 to form a plurality of parallel refrigerant flow paths, the flow path member 12 and the header member 14
Even if you make the thickness very thin.

Since the flow resistance of the refrigerant can be reduced and 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 6 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. Alternatively, there will be no constraint on improving performance, such as preventing blockage of airflow passages during frost formation.

FIG. 4 shows disassembly of different embodiments of the flat refrigerant flow path 5. 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 a refrigerant inlet pipe 7 and an outlet pipe 8, and further, outer wall members 16 which become outer walls of the refrigerant flow path are stacked and integrated on both upper and lower surfaces thereof. In particular, it constitutes a flat refrigerant flow path.

In this case, since the header members 20 are laminated on both sides of the flow path member 18, the flow path area in a part of the header can be increased, and the pressure loss of the refrigerant can be extremely reduced. Since these flow in opposite directions, 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 overall thickness of the device 6 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 stacking a plurality of flat plate-like members at appropriate intervals, and arranges the flat refrigerant flow path in parallel to the air flow direction. Since it is constructed by attaching a large number of fin members parallel to the air flow direction to the outer wall of the channel, the dead area of the coolant flow channel does not affect the fins, and the fins can be used effectively to improve heat transfer performance. can be made higher. 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 drawings]

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 the flat plate member constituting the flat refrigerant flow path of the heat exchanger, and FIG. 6 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. 6... Flat refrigerant channel, 6... Fin member, 12... Channel member, 14... Header member, 16...・Exterior wall components. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 Figure 5

Claims (4)

[Claims] (1) A refrigerant flow path is constructed by stacking a plurality of flat plate-like members at appropriate intervals, and the flat refrigerant flow path is arranged parallel to the air flow direction, and the flat refrigerant flow path is arranged on the outer wall of the flat refrigerant flow path. A heat exchanger configured by attaching multiple fin members parallel to the airflow direction. (2) Planar flow path members each having a plurality of slits serving as refrigerant flow paths are stacked in such a way that they are sandwiched between header members provided with headers that communicate the slits with each other, and refrigerant flow paths are formed 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 that become the outer wall, and the flat refrigerant flow path is arranged parallel to the air flow direction, and the outer wall of the flat refrigerant flow path is arranged parallel to the air flow direction. The heat exchanger according to claim 1, wherein the heat exchanger is constructed by attaching a large number of fin members parallel to each other. (3) The heat exchanger according to claim 1, wherein the flow direction of the refrigerant in the flat refrigerant flow path is configured to face the direction of air flow. (4) 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. The heat exchanger according to item 3.