JPH0631713B2 - Heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchanger used in, for example, a refrigerator.

2. Description of the Related Art A conventional heat exchanger of this type has a structure as shown in FIG.

That is, 1 is a flat plate-like flow path portion, which is arranged parallel to the air flow direction 2. Reference numeral 3 is a fin member, and a large number of fin members are attached to the outer wall of the flat plate-like channel portion 1 substantially in parallel to the air flow direction 2.
Reference numeral 4 denotes a refrigerant inlet / outlet pipe connected to the flat plate-shaped flow path section 1. The refrigerant flowing in through the one inlet / outlet pipe 4 flows in the flat plate-shaped flow path portion 1. At this time, heat is received from the air flow side through the fin member 3, evaporated, and flows out from the other inlet / outlet pipe 4.

FIG. 4 is an exploded perspective view of a flat plate-shaped member forming the flat plate-shaped flow path section 1. The flow path member 5 is provided with a plurality of slits 6 serving as a coolant flow path in parallel. On both sides of the flow path member 5, outer wall members 7 that serve as outer walls of the refrigerant flow path when stacked are located. In the outer wall member 7, a plurality of slits 6 provided in the flow path member 5 are communicated with each other, and the refrigerant inlet / outlet pipe 4 is provided.
A ridge 9 is provided which constitutes a header 8 leading to the. The flat plate-shaped flow path portion 1 is configured by stacking and integrating the above three members.

Problems to be Solved by the Invention However, with such a structure, there is a problem that there is a large variation in the branching of the refrigerant into the slits 6 serving as the refrigerant channels.

The reason will be described below with reference to FIG. Fifth
The figure is a cross-sectional view showing the flow state of the refrigerant in the header 8. The refrigerant flowing in from the inlet / outlet pipe 4 flows in the header 8 while the refrigerant gas and the liquid are separated by the influence of gravity. In the header 8, it flows while branching to the slit 6, but due to the inertial force of the liquid, the liquid surface shows a high distribution on the side opposite to the inlet / outlet pipe. Therefore, the refrigerant having a high dryness flows into the slit 6 near the inlet / outlet pipe, and the refrigerant having a low dryness flows into the slit 6 on the side opposite to the inlet / outlet pipe.

Therefore, the present invention provides a heat exchanger having excellent heat transfer characteristics by improving the branching characteristics of the refrigerant.

Means for Solving the Problems And technical means of the present invention for solving the above problems,
On both sides of a flat plate-like flow path member provided with a plurality of slits serving as a refrigerant flow path, the plurality of slits are communicated with each other, communicated with a refrigerant inlet / outlet pipe, and the refrigerant inlet portion becomes lower in the vertical direction. An outer wall member provided with an inclined ridge is laminated and integrated to form a header.

Action The action of this technical means is as follows.

Due to the inclination of the header, the refrigerant is affected not only by the gravity perpendicular to the flow direction but also by the gravity in the flow direction.
In particular, since the inlet of the refrigerant is made low, the inertial force of the liquid and the flow direction component of the power are canceled.

As a result, the liquid level can be kept horizontal, and the branching characteristic of the refrigerant to the slit can be improved.

Example FIG. 1 is an exploded perspective view of a flat plate-shaped member that constitutes a flat plate-shaped flow path portion 11 using a heat exchanger according to an embodiment of the present invention in a refrigerator evaporator.

The flow path member 12 is provided with a plurality of slits 13 that are refrigerant flow paths in parallel. On both sides of the flow path member 12, outer wall members 14 that serve as a refrigerant flow path outer wall at the time of stacking are positioned. The outer wall member 14 has the same outer dimensions as the flow path member 12.
The outer wall member 14 is provided with a ridge 17 that connects the plurality of slits 13 provided in the flow path member 12 to each other and that further forms a header 16 that communicates with the refrigerant inlet / outlet pipe 15. The ridge 17 is inclined so as to be convex downward on the inlet / outlet tube 15 side and convex upward on the opposite side with respect to the flat plate-like channel portion 11. The flat plate-shaped flow path portion 11 is configured by stacking and integrating the above three members.

FIG. 2 is a sectional view showing the flow state of the refrigerant in the header 16. The refrigerant flowing from the inlet / outlet pipe 15 is separated into gas and liquid and enters the header 16. Header 16
Within, liquids are subject to inertial forces and gravity. Gravity can be considered by separating the component A of the refrigerant in the traveling direction and the component B perpendicular thereto. The component A cancels out because it is in the opposite direction to the inertial force, and the liquid surface shows a substantially horizontal distribution due to the influence of the component B alone. Therefore, the refrigerant having the same dryness and the same flow rate flows into the slit 13, which serves as the refrigerant flow path.

Although not shown in FIG. 1, when actually configured as an evaporator, fins are installed on both sides of the outer wall member 14 of the flat plate-like flow path portion 11 to perform heat exchange with air.

In the embodiment of FIG. 1, the shape of the ridge 17 is rectangular, but the same effect can be obtained even if the shape is elliptical or another shape.

EFFECTS OF THE INVENTION The present invention, on both sides of a flat plate-like flow path member provided with a plurality of slits serving as a refrigerant flow path, communicates the plurality of slits with each other, communicates with a refrigerant inlet / outlet pipe, and with respect to the vertical direction. By forming the header by stacking and integrating the outer wall members provided with the inclined ridges at which the refrigerant inlet portion becomes low, the branching characteristics of the refrigerant can be improved and a heat exchanger having excellent heat transfer characteristics can be realized.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a flat plate-shaped member constituting a flat plate-shaped flow path portion used in a heat exchanger according to an embodiment of the present invention, and FIG.
Sectional drawing which shows the flow of the refrigerant | coolant in the header of a figure, FIG. 3 is the whole perspective view of the conventional evaporator, FIG. FIG. 5 is a sectional view showing the flow of the refrigerant in the header of the evaporator shown in FIG. 1, 11 ... Plate-shaped flow path portion, 3 ... Fin member, 5, 1
2 ... flow path member, 8, 14 ... outer wall member, 10, 17 ...
… Raised.

Claims (1)

[Claims] 1. A plurality of slits serving as a coolant channel are provided on both sides of a plate-shaped flow channel member, the plurality of slits are communicated with each other, communicate with an inlet / outlet pipe of the coolant, and, in the vertical direction, A heat exchanger in which outer wall members provided with inclined ridges having a low entrance are laminated and integrated, and fins are installed on both sides of the outer wall members.