JPH02130391A - Heat exchanger for vehicle - Google Patents

Abstract

PURPOSE:To reduce the number of paths, shorten a vertical size shorter than the title heat exchanger so far and contrive the improvement of the efficiency of heat exchange by a method wherein refrigerant is made to flow symmetrically about a central header pipe interposed between two sets of header pipes. CONSTITUTION:The central header pipe 16 of a heat exchanger 11 is provided with a partitioning plate 19, dividing the inside of the header pipe 16 into upper half and lower half substantially, at the central part of the same. Accordingly, refrigerant flows symmetrically about the pipe 16 from the central header 16 to both sides header pipes 12, 13 and from both sides header pipes 12, 13 to the central header pipe 16 again whereby the flow rate of the refrigerant in respective paths becomes half substantially. Accordingly, about one half of the length of flow passage is necessitated in order to obtain the same capacity as the heat exchanger so far and the number of paths may be reduced. According to this method, the vertical size of the heat exchanger or the lengthwise size of respective header pipes may be shortened remarkably as compared with the heat exchanger so far and efficiency upon using the heat exchanger on a vehicle can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a parallel flow type vehicle heat exchanger used in vehicle air conditioners and the like.

(Conventional technology) Conventionally, as a parallel flow type vehicle heat exchanger,
For example, there is one described in Japanese Patent Publication No. 63-16139.

As shown in FIG. 7, this type of heat exchanger 1 has a plurality of parallel flat tubes 4 connected between an inlet header pipe 2 and an outlet header pipe 3, and a ladder vibrator connected to the inlet. An inlet union 5 for taking in the refrigerant is provided at the upper end of the outlet header pipe 2, while an outlet union 6 for discharging the refrigerant is provided at the lower end of the outlet header pipe 3. In addition, a multiple pass structure (3 passes in Fig. 7) where the refrigerant flows in a meandering manner multiple times between the inlet union 5 and the outlet union 6.
In order to do this, partition plates 7 are provided inside the inlet header pipe 2 and the outlet header pipe 3, respectively. Note that 8 in the figure indicates a wavy fin.

When such a parallel flow type heat exchanger 1 is mounted on a vehicle, each of the header pipes 2 and 3 is installed substantially vertically behind a grille that takes in air from the vehicle. By adopting a multiple bus structure, the path length of the refrigerant is increased, thereby improving heat exchange performance.

(Problems to be Solved by the Invention) However, there are the following problems when mounting the above conventional parallel flow type heat exchanger on a vehicle, particularly a passenger car.

In recent years, the noses of passenger cars have become lower, and the vertical dimensions of the air intake grilles have become narrower, which has hindered the ability of mounted heat exchangers to take full advantage of their efficiency.

In other words, the conventional parallel flow type heat exchanger
A structure that increases the number of passes improves efficiency, but when installed in a vehicle, increasing the number of passes increases the vertical dimension of the heat exchanger, and as mentioned above, the vertical dimension of the grill becomes narrower, so the running wind This caused a problem in that the heat exchanger was no longer able to flow through the entire heat exchanger, making it unable to fully demonstrate its capacity and resulting in a decrease in efficiency.

Therefore, an object of the present invention is to reduce the vertical dimension when mounted on a vehicle by reducing the number of header pipes to three, thereby solving the above-mentioned problems.

(Means for Solving the Problems) The vehicle heat exchanger of the present invention is a parallel flow type vehicle heat exchanger in which a plurality of tubes are arranged parallel to each other between two header pipes. A central header pipe is interposed between both header pipes, and the refrigerant is allowed to flow symmetrically within the heat exchanger around the central header pipe.

(Function) According to the heat exchanger of the present invention, the refrigerant flows symmetrically through the other two header pipes around the central header pipe. Therefore, the amount of refrigerant flowing between the central header pipe and each header pipe is halved compared to the conventional method, and the refrigerant path length can be shortened accordingly.
The number of passes can be reduced. As a result, it is possible to reduce the vertical dimension, that is, the longitudinal dimension of the header pipe, while maintaining the same performance, and it is possible to prevent a decrease in efficiency when mounted on a vehicle.

(Example) A first embodiment of the present invention will be described below based on the drawings.

1 and 2 show the heat exchanger 11 of this embodiment,
In the figure, a plurality of tubes 14 are provided parallel to each other between the left and right header pipes 12 and 13, and wavy radiation fins 15 are interposed between these tubes 14. There is. Further, a central header pipe 16 is interposed between the header vibes 12 and 13 on both sides, and this header pipe 16 is communicated with each tube 14.

Further, an inlet union 17 is attached to the upper end of the central header pipe 16, and an outlet union 18 is attached to the lower end of the header pipe 16. A partition plate 19 is provided at the center of the central header pipe 16 to divide the interior into approximately halves vertically, and as shown by the arrows in FIG. 12, 13 through four tubes 14, and then flows from the header pipes 12, 13 on both sides to the central header pipe 16 through another four tubes 14.

According to such a heat exchanger 11, as shown in FIG. 3, from the central header pipe 16 to the both side header pipes 12.
Since the refrigerant flows symmetrically around the central header pipe 16 from the header pipes 12 and 13 on both sides to the central header pipe 16 again, the refrigerant flow rate in each bus is approximately halved. Therefore, in order to maintain the same ability as before,
Only about half the length of the flow path is required, making it possible to reduce the number of passes, and as a result, compared to the conventional heat exchanger 1 shown by the two-dot chain line in FIG. 4, the heat exchanger of this example shown by the broken line Vessel 1
1, the vertical dimension, that is, the longitudinal dimension of each header pipe, can be significantly shortened, and efficiency when mounted on a vehicle can be ensured.

Next, the second embodiment of the present invention is shown in FIGS. 5(a) and (b).
The explanation will be based on.

In the heat exchanger 21 of this embodiment, the refrigerant flow path between the central header pipe 16 and the header pipes 12 and 13 on both sides has a three-bus configuration.

That is, while the entrance union 17 is provided on the upper end side of the central header pipe 16, each of the header pipes 12, 13 on both sides
Outlet unions 18 are provided at the lower ends of each tube, and partition plates 19 are provided in the central header pipe 16 and the header pipes 12 and 13 on both sides so that three tubes 14 constitute one bus.

In this case, the refrigerant in the heat exchanger will flow in three passes symmetrically around the central header pipe 16, as shown by the arrows in FIG. 5(b). As in the example, the longitudinal dimension of the heat exchanger can be shortened.

Furthermore, a third embodiment will be described based on FIGS. 6(a) and 6(b).

In the heat exchanger 22 of this embodiment, as shown in FIG. 6(a), the inlet union 17.17 is connected to the header pipes 12.17 on both sides.
13 on the upper end side, and an outlet union 18 is provided on the lower side of the central header pipe 16.
The structure has three passes on each side, centering on . Note that 19 in the figure indicates a partition plate.

Also in this embodiment, the flow direction of the refrigerant is symmetrical with respect to the central header pipe 16, so that the vertical dimension can be shortened.

In each of the above embodiments, the flow path is configured to have two or three passes, but the flow path is not limited to this, and the number of passes may be selected depending on the required amount of heat exchange.

Furthermore, even if the structure has the same number of passes, it is possible to create various flow path configurations by using a plurality of inlet unions and outlet unions to make the refrigerant flow symmetrical.

(Effects of the Invention) As described above, according to the present invention, since the third header pipe is provided and the refrigerant flows symmetrically, the left and right refrigerant flow paths are shortened, The number of passes required is small, the vertical dimension can be made shorter than before, and therefore, when mounted on a vehicle, the running wind can be passed through the entire surface, and the efficiency can be fully demonstrated. Moreover, since the flow path length is shortened and the flow rate in each tube is reduced, the flow path resistance of the refrigerant is reduced, the degree of drift is reduced, and the efficiency of heat exchange can be improved. Furthermore, since the third header pipe is provided in the middle of the tube, the middle of the tube is supported and the strength can be improved.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, FIG. 1 is a front view of the heat exchanger, FIG. 2 is a plan view of the heat exchanger,
FIG. 3 is a schematic diagram showing the flow of refrigerant in the heat exchanger, FIG. 4 is a schematic front view showing the external shapes of the heat exchanger of the present invention and the conventional heat exchanger, and FIG.
Figures (a) and (b) show the second embodiment of the present invention, and the fifth embodiment shows the fifth embodiment.
Figure (a) is a front view of the heat exchanger, Figure 5 (b) is a schematic diagram showing the flow of refrigerant in the heat exchanger, and Figures 6 (a) and (b) are the third embodiment of the present invention. 6(a) is a front view of the heat exchanger, FIG. 6(b) is a schematic diagram showing the flow of refrigerant in the heat exchanger, and FIG. 7 is a front view showing a conventional heat exchanger. be. 12.13...Header pipes on both sides 14...Tube 16...Central header pipe Patent applicant: Diesel Equipment Co., Ltd.

Claims (1)

[Claims] In a parallel flow type vehicle heat exchanger in which a plurality of tubes are arranged parallel to each other between two header pipes, a central header pipe is interposed between the two header pipes. A heat exchanger for a vehicle, characterized in that the heat exchanger is equipped with a central header pipe and allows a refrigerant to flow symmetrically around the central header pipe.