JPH0446357B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a heat exchanger used, for example, in an air conditioner, and particularly relates to improving the heat dissipation characteristics of a heat exchanger plate that forms the main body of a heat transfer fin device. .

[Conventional technology]

7, 8 and 9 are sectional views showing the main parts of the heat exchanger of Japanese Patent Application No. 59-264087 (see Japanese Patent Application Laid-open No. 61-143697), which forms the basis of this invention, and its transmission. 1 is a perspective view and a sectional view showing a heat fin device. In the figures, 1a, 1b, and 1c are heat transfer plates each having a large number of through holes 2, and these are arranged in a stacked state at predetermined intervals as shown in the figure. As shown in FIG. 9, branch channels A1 and A2 for cooling fluid A, such as outside air, are formed between each other as shown in FIG. Reference numeral 3 denotes a bent wall portion repeatedly formed at the same pitch on each of the heat exchanger plates 1a, 1b, and 1c. Enlarged channels 4 and narrow channels 5, whose cross-sectional areas are periodically different, are alternately formed back to back. Further, 6 in FIG. 7 indicates a distribution pipe for refrigerant, etc.

Since the heat transfer fin device in the conventional heat exchanger is configured as described above, the parallel heat transfer plates 1a,
When fluid A is passed between 1b and 1c, a pressure difference is created between the enlarged channel 4 and the narrow channel 5, which are arranged back to back, and the flow direction of the fluid passing through the branch channels A1 and A2 remains unchanged. Part of the fluid flows through the large number of through holes 2 at the back-to-back locations, thereby making it possible to thin the so-called temperature boundary layer that develops and forms along the surfaces of each heat exchanger plate 1a, 1b, 1c. As a result, a heat transfer fin device with an extremely high heat transfer coefficient can be obtained.

[Problem that the invention seeks to solve]

As mentioned above, although it is expected that the heat transfer coefficient will improve with the conventional type, each heat exchanger plate has a large number of through holes, so the heat exchange area naturally decreases by the number of through holes. I will do it. This invention focuses on this point, and aims to increase the amount of heat exchange while avoiding a decrease in the heat exchange area, and to improve workability.

[Means for solving problems]

In the case of this invention, when the fluid is flowing into each branch channel, the exit side of the through hole of the heat transfer fluid flowing from the enlarged channel to the narrow channel is extruded by punching and forming the through hole. Each piece is raised to be located within each narrow channel. Further, in another embodiment of the present invention, the tips of the extruded pieces formed in each narrow passage between the heat exchanger plates are bent outward along each heat exchanger plate.

[Effect]

In the case of this invention, an extruded piece is formed on the exit side of the through hole of each heat transfer plate, so the heat exchange area increases by the area of this extruded piece, and each extruded piece is Since it is formed on the exit side of the through hole through which the heat transfer fluid passes, and promotes its flow, the heat transfer coefficient by this heat transfer fluid can be improved more effectively. Furthermore, in another embodiment of the present invention, the tip of the extruded piece is bent outward along the heat transfer plate, thereby eliminating the reduction in heat transfer area and reducing wind pressure loss, thereby improving the performance of the heat exchanger. In addition to being easy to measure, punching from one direction can be used to form each through hole, which improves processing efficiency.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of the heat exchanger of the present invention, and the same parts as in the conventional one are indicated by the same symbols. It is characterized in that it has a large number of through holes 2 having extruded pieces 2a on the exit side thereof, and is composed of a laminate of a plurality of heat exchanger plates 1a, 1b, 1c bent in a trapezoidal wave shape. Reference numeral 6 in the figure is, for example, a refrigerant distribution pipe arranged so as not to prevent the cooling fluid A such as outside air from flowing between the laminated heat transfer plates 1a, 1b, and 1c. FIG. 2 shows each heat exchanger plate 1 of the present invention described above.
It is a front view of a heat transfer fin device consisting of a laminated body of a, 1b, and 1c, and 7 is a through hole of the above-mentioned refrigerant distribution pipe 6. FIG. 3 is a cross-sectional view of FIG.
This figure shows the arrangement of the through holes 2 with the extruded pieces 2a formed by the above-mentioned punch-through molding in the branch channels A1 and A2 formed by b and 1c. It is arranged so that it is on the inside when viewed from the flow path 5 and on the outside when viewed from the enlarged flow path 4. FIG. 4 is a partially enlarged sectional view showing the through hole 2 formed by punching and the extruded piece 2a on the exit side thereof.

If we consider the fluid flowing through the branch channels A1 and A2 in the above configuration, for example, in a cross section where the narrow channel 5 and the enlarged channel 4 are adjacent back to back, the cross-sectional area of the enlarged channel 4 is the cross-sectional area of the narrow channel 5. , the flow velocity of the fluid flowing through the enlarged channel 4 at that part becomes smaller than the flow velocity in the narrow channel 5, and a static pressure difference occurs between the narrow channel 5 and the enlarged channel 4. Result expansion channel 4
A part of the fluid flows from the extrusion piece 2a into the narrow flow path 5.
It flows through the through hole 2 with the arrow in the figure as shown by the arrow. Further, since the direction in which the extruded pieces 2a are generated is located on the exit side of the heat transfer fluid, the flow of the heat transfer fluid is thereby smoothly induced. This is useful for thinning the temperature boundary layer and increasing heat transfer efficiency by suctioning and inflowing the heat transfer fluid. Since the surface area of each other extruded piece is added to the surface area of the heat exchanger,
This makes it possible to prevent a reduction in the heat exchange area of the heat exchanger due to a simple through hole.

Furthermore, FIG. 5 is a sectional view corresponding to FIG. 3 showing a heat exchanger plate according to another embodiment of the present invention, and in this case, each extruded piece 2a has its tip end particularly as shown in FIG. It is bent outward along the heat transfer plate to form a flange shape, which is unique in that it suppresses the height of the extruded pieces that protrude into each narrow flow path and reduces wind pressure loss. have.

〔Effect of the invention〕

As described above, in the heat exchanger of the present invention, the extruded pieces generated by the punch-through forming are actively retained in the through holes provided in each heat exchanger plate.
Not only does the heat exchange area increase by the amount of these extruded pieces, but each extruded piece is provided on the outlet side through which the heat transfer fluid flows, so a further heat transfer promotion effect is expected by promoting the generation action. This has the effect of improving the heat transfer coefficient. In addition, in another embodiment of the present invention, the tip of each extruded piece is bent outward along the heat transfer plate to suppress the length of the extruded piece protruding into the narrow flow path, which has the effect of reducing the wind pressure loss accordingly. It has the following.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the heat exchanger of the present invention, FIG. 2 is a front view of the heat transfer fin device in FIG. 1, and FIG. 3 is an enlarged sectional view of FIG.
FIG. 4 is a partially enlarged sectional view showing the through hole of the present invention formed by punching and the extruded piece on the exit side thereof;
The figure is a sectional view corresponding to FIG. 3 showing a heat exchanger plate according to another embodiment of the present invention, and FIG. 6 is a partially enlarged sectional view showing the through hole and the extruded piece on the exit side of the one in FIG. Fig. 7 is a partially enlarged cross-sectional view showing an example of a conventional heat exchanger, Fig. 8 is a perspective view showing the combined state of the heat exchanger plates in Fig. 7, and Fig. 9 is a cross-sectional view of the heat exchanger shown in Fig. 8. FIG. 2 is an explanatory diagram of the main parts shown in In the figure, A is the fluid, A1 and A2 are the branch channels, 1
a, 1b, and 1c are heat exchanger plates, 2 is a through hole, 2a is a pushing piece, 4 is an enlarged channel, and 5 is a narrow channel. In other figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. The branch channels are installed opposite to each other so that the cross-sectional areas thereof differ periodically along the flow direction of the fluid flowing therebetween, and each branch channel has a large number of through holes. Consisting of a plurality of heat transfer plates, the pressure difference between an enlarged flow path and a narrow flow path formed back to back in each branch flow path generates a heat transfer fluid passing through the through holes between them. , on the outlet side of the through hole of the heat transfer fluid flowing from the enlarged flow path toward the narrow flow path in the state where the fluid is flowing into each of the branch flow paths, extruded pieces formed by punching through each through hole are respectively attached. A heat exchanger characterized in that the heat exchanger is positioned within each narrow flow path. 2. The heat exchanger according to claim 1, wherein the tips of the extruded pieces formed in each narrow flow path between the heat exchanger plates are bent outward along each heat exchanger plate.