JPH0711332Y2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a parallel flow type heat exchanger.

(Prior Art) In a heat exchanger of parel flow type, a plurality of flat tubes are arranged in parallel with each other, an inlet side header pipe is connected to one end side of these tubes, and an outlet side is connected to the other end side of the tubes. Side header pipe is connected. The refrigerant is configured to flow in parallel between the inlet header pipe and the outlet header pipe through the passages in the plurality of tubes.

Further, as a connection structure between each header pipe and the tube, as shown in FIG. 9, the end portion of the tube 21 is formed flat as viewed in the axial direction of the header pipe 22, and the end portion of the tube is inserted into the insertion hole 23. It is known that they are inserted into the header pipe 22 from the above and are connected to each other by integrally brazing by projecting into the pipe 22 of a predetermined length in order to secure a brazing allowance (for example, JP-A-61-235698). , JP 63-112065). In these cases, the header pipe 22 with a diameter larger than the width of the tube 21
To reduce the amount of protrusion of the tube 21
The structure is made to reduce the refrigerant flow resistance in 22.

(Problems to be solved by the invention) However, in the above conventional heat exchanger, since the projection amount of the tube end portion in the header pipe is small, the refrigerant flow resistance can be reduced, but a large diameter header pipe can be used. Since it is used, there is a problem that the amount of refrigerant in the header pipe increases. By the way, since the amount of refrigerant in the header pipe occupies about 50% of the refrigeration cycle, it is desirable that the header pipe has a small diameter in order to save refrigerant.

Therefore, as shown in FIG. 10 and FIG. 11, by using a header pipe 24 having a small diameter, it can be considered to reduce the refrigerant capacity, but in this case, the tube end portion in the header pipe 24 Inevitably the amount of protrusion becomes large,
As indicated by the solid line arrow in the figure, the refrigerant flows in a wave shape around the tube end portion, increasing the flow resistance and increasing the pressure loss.

Therefore, an object of the present invention is to provide a heat exchanger capable of saving the refrigerant in the header pipe and reducing the flow resistance.

(Means for Solving the Problems) The present invention relates to a parallel flow type heat exchanger in which each end portion of a plurality of tubes arranged in parallel with each other is inserted into one and the other header pipes and connected. It is a heat exchanger in which an end portion of each tube inserted into each header pipe is cut out in a direction along the inner peripheral surface of the header pipe on the side where the tube is inserted.

(Operation) Since the tube end inserted into the header pipe is cut out in the direction along the inner peripheral surface of the pipe, the amount of protrusion of the tube end in the header pipe becomes small, so the header pipe The flow resistance of the refrigerant flowing in the inside in the axial direction is reduced, and the flow area of the refrigerant is increased. Therefore, in order to secure the same refrigerant flow rate, it is possible to use a small-diameter header pipe, the amount of refrigerant in the header pipe is reduced, and it is possible to save the refrigerant in the entire refrigeration cycle.

(Example) Below, the 1st Example of this invention is described based on drawing.

In the heat exchanger 1 of this embodiment, as shown in FIG. 1, an end portion of a plurality of flat tubes 4 arranged in parallel to each other is connected to an inlet header pipe 2 and an outlet header pipe 3. The corrugated fins 5 are interposed between the flat tubes 4. In the figure, 6 and 7 indicate side plates. And
An inlet joint 8 is attached to the inlet header pipe 2, and an outlet joint 5 is attached to the outlet header pipe 3.
A partition plate 10 is provided at 3 so that the refrigerant may meander between the joints 8 and 9 a plurality of times.

As shown in FIGS. 2 and 3, each of the header pipes 2 and 3 is formed in a tubular shape in transverse cross section, and each of the tubes 4 is
Ends of the header pipes 2 and 3 are inserted into the header pipes 2 and 3 by a predetermined length so as to secure a brazing allowance, and are connected by integral brazing. . Further, in the present embodiment, as shown in both figures, the tube ends inserted in the header pipes have inner circumferences of the header pipes 2 and 3, respectively, when viewed from the axial direction of the header pipes 2, 3, that is, the refrigerant flow direction. It is formed in a shape that curves along the surface.

Therefore, in this embodiment, since the protruding amount of the tube end portion in the header pipes 2 and 3 is small, the flow resistance of the refrigerant flowing in the header pipes 2 and 3 is significantly reduced and the pressure loss is reduced. In addition, the refrigerant flow area increases, and it becomes possible to use a header pipe with a smaller diameter accordingly.
The capacity of the header pipe can be reduced, and the refrigerant can be saved.

Next, a second embodiment of the present invention will be described.

In this embodiment, as shown in FIG. 4, the lateral width of the tube end portion is formed in a tapered shape as viewed from the refrigerant flow direction, and the tube end portion is curved like the above embodiment. Is formed in. Further, as shown in FIG. 5, the tube end portion which is tapered so that the refrigerant passages have the same cross-sectional area is formed to have a large thickness.

Therefore, in this embodiment, as shown in FIG. 4, it is possible to use a header pipe having a diameter t smaller than the tube width T, and it is possible to further reduce the refrigerant.

Further, a third embodiment of the present invention will be described.

In this embodiment, as shown in FIG. 6, each header pipe 2, 3
As a tank 12 and end plate that are radially divided
It is constructed by using header pipes 2 and 3 consisting of 13 and the tube tip is formed in a curved shape as in the previous embodiment.

In the present embodiment, the tank 12 and the end plate 13 are formed into circular curved surfaces that are curved with substantially the same radius of curvature, and by joining these, the header pipes 2 and 3 are formed so that the cross-sectional shape thereof is substantially elliptical. Has been done. Furthermore, the end plate
The joint portion 13a of 13 is joined inside the joint portion 12a of the tank 12, and the tube 4 is inserted into the insertion hole 11 provided in the end plate 13.

Therefore, in this embodiment, since the cross-sectional shape of the header pipe can be formed into a substantially elliptical shape, it is possible to reduce the volume in the header pipe and further reduce the refrigerant.

Further, by combining the header pipe of this divided structure with the tapered tube shown in FIG. 4, it is possible to further reduce the refrigerant.

Incidentally, the shape of the tank and the end plate of the header pipe of the divided structure may have different radii of curvature,
Further, it may be formed on any curved surface such as an elliptic curved surface instead of the circular curved surface.

FIGS. 7 and 8 show a fourth embodiment of the present invention, which is constructed by using header pipes 2 and 3 composed of a tank 12 and an end plate 13 which are divided in a radial direction, as in the previous example. In the case of FIG. 7, the tip of the tube 4 is formed in a triangular notch with respect to the original shape of the tube end, and in FIG. 8, it is formed in a trapezoidal notch. As described above, according to the present invention, the ends of the tubes inserted into the header pipes are cut out toward the inner peripheral surface of the header pipe on the side where the tubes are inserted. Therefore, in addition to the above-mentioned curved surface shape, an arbitrary aspect such as the corner shape of this embodiment can be adopted.

(Effects of the Invention) As described above, according to the present invention, the tube end portion inserted into each header pipe is cut out in the direction along the inner peripheral surface of the pipe, so that the tube inside the header tube is formed. Since the amount of protrusion of the end portion is small, the flow resistance of the refrigerant in the header pipe is significantly reduced, the pressure loss can be reduced, and the diameter of the header pipe can be reduced, so that the refrigerant can be saved.

[Brief description of drawings]

1 to 3 relate to a first embodiment of the present invention.
The figure is a front view of the heat exchanger, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 showing the cross section of the header pipe, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 4 and 5 relate to a second embodiment of the present invention, and FIG. 4 is a cross-sectional view of a header pipe,
5 is an end view of the tube, FIG. 6 is a cross-sectional view of a header pipe showing a third embodiment of the present invention, and FIGS. 7 and 8 are cross-sections of a header pipe showing a fourth embodiment of the present invention. Floor plan,
9 to 11 relate to a conventional example, FIGS. 9 and 10 are cross-sectional views of a header pipe, and FIG. 11 is a cross-sectional view of FIG.
FIG. 9 is a sectional view taken along the line IX-IX. 1 …… Heat exchanger 2,3 …… Header pipe on inlet and outlet 4 …… Tube

Claims (1)

[Scope of utility model registration request] 1. A parallel flow type heat exchanger in which ends of a plurality of tubes arranged in parallel with each other are inserted into one and the other header pipes to be connected, and the heat exchangers are inserted into the header pipes. A heat exchanger characterized in that an end portion of each tube is formed with a notch in a direction along the inner peripheral surface of the header pipe on the side where the tube is inserted.