JPH01217195A - Heat exchanger - Google Patents

Abstract

PURPOSE:To enable the simplification of an assembling process and the small- sized cylindrical part to adopt, plan the miniaturization of a heat exchanger and make it lightweight by notching both ends of a tube which has a heat medium passage inside and is equipp-with corrugated fins and inserting an inserting an part in the opening of a cylindrical member to joint. CONSTITUTION:Both side edge parts of a tube 10 are removed through the length L3 and a step part 15 is formed so that width dimension is L2. Since the dimension of an opening part 21 at the side of an cylindrical member 20 corresponds to the width dimension of L2 and the height dimension of S, the small-sized and lightweight cylindrical member 20 can be adopted. A corrugated fin 30 is mounted between neighboring tubes 10. A passage 11 of heat medium only in the center is formed by making the tube 10 extrusion molding.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a room air conditioner used as an air conditioner;
The present invention relates to a heat exchanger that exchanges heat between 1 m of a refrigerant and a fluid such as air in a car cooler or the like, and is particularly suitable for use in a vehicle.

[Prior art] A heat exchanger that receives heat between a refrigerant and a fluid such as air is
Generally, a heat exchange section is created by arranging multiple tubular members in parallel that form refrigerant passages, and joining corrugated fins made by bending metal plates with good thermal conductivity between the tubular members. In addition, it has a basic structure in which both ends of the tubular member are connected to a cylindrical member that also serves as a tank for storing a heat medium, and a refrigerant passage formed inside the tubular member is connected to the inner cavity of the cylindrical member. There is.

FIG. 7 shows a conventional heat exchanger, in which a tube 1 is a plate-shaped tube with a substantially rectangular cross-section, and a passage through which a heat medium flows is formed inside. The tube 1 can be manufactured, for example, by extrusion molding an aluminum alloy material, or by joining a pair of molded plates each having a heat medium passage formed inside. A fin 3 is attached to one side of the tube 1. The fin 3 is formed by bending an aluminum alloy material or the like into a corrugated shape, and has a fin shape that makes the contact area of fluid such as air as large as possible.

In FIG. 7, only a part of the fin 3 is shown and the remaining part is omitted, but it is naturally attached to the entire length of the tube 1. Both ends of the tube 1 are joined to a cylindrical member 2 called a header. The cylindrical member 2 is a hollow metal tube that constitutes an inlet and an outlet for the heat medium, and also serves as a tank for accommodating the heat medium. Therefore, the cylindrical member 2 is equipped with pipes 4 and 6 for introducing and discharging the heat medium, and is connected to other pipes and equipment (not shown) via joints 5.7.

Both ends of the tube 1 are joined by being inserted into an opening formed in a cylindrical member 2.

[Problems to be Solved by the Invention] In the heat exchanger having the conventional structure as described above, in order to insert the tube l into the 6n round part of the cylindrical member 2 and join it, the width dimension L1 of the tube 1 is cannot exceed the diameter of the cylindrical member 2, and the diameter of the cylindrical member 2 inevitably has to be large. Further, when assembling the tube and the cylindrical member, an assembly jig is required to define the distance between the two. Further, since the inside of the cylindrical member 2 is filled with a heat medium under pressure, it is necessary to provide pressure-resistant strength. The pressure resistance of the cylindrical member 2 can be obtained by increasing the wall thickness of the cylindrical member 2, which is a metal tube, but when the diameter of the cylindrical member 2 is increased, the wall thickness is also increased accordingly. As a result, a large and heavy cylindrical member must be used.

For this reason, the dead space occupied by the cylindrical member also increases, which is disadvantageous in terms of effective use of the limited vehicle space when used as a heat exchanger for a vehicle.

The present invention makes it possible to use a small cylindrical member as a header without reducing the width of the tube, making it easy to assemble, and the overall size is small.
The purpose is to provide a lightweight heat exchanger.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the present invention provides a heat exchanger having the general structure described as a conventional example, in which a tube is provided at both ends of the tube in the longitudinal direction. A stepped portion is formed by providing a notch over a predetermined length, and an insertion portion that is smaller than the remaining portion of the tube by tJ% of the width is formed on the end side of the tube from the stepped portion. The member is formed so that its inner diameter is between the maximum width of the tube and the width of the insertion portion, and one cylindrical member is formed with a slit-like opening having a size corresponding to the insertion portion. and is inserted into the opening until the step part of the insertion part formed at the end of the tube comes into contact with the outer peripheral surface of the cylindrical member, and the cylindrical member and the tube are connected in a liquid-tight manner. is the basic method.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 shows the main parts of a heat exchanger according to an embodiment of the present invention, and a tube 10 has a rectangular cross-sectional shape with a width L and a height S, similar to the tube shown as a conventional example. It is equipped with This tube 10 is provided with a passage 11 passing therethrough in the longitudinal direction through which a heat medium flows.

Although the number and cross-sectional shape of the passages 11 may vary depending on the need, the illustrated embodiment has three passages each having a rectangular cross-section.

Then, at both ends of the tube 10, both side edges of the tube 10 are removed over a length L3 to form a step part 15 so that the width dimension becomes L2, and an insertion part 12 is formed on the end side. .

On the other hand, an opening 21 for receiving the insertion portion 12 of the tube 10 is formed on the cylindrical member 20 side. The vertical and horizontal dimensions of this opening 21 are the width dimension Lz of the insertion portion 12.
g corresponding to the height dimension S, and the insertion part 1
Since the width L2 of the tube 10 is smaller than the width L2 of the central part of the tube 10, the width of the opening 21 can be correspondingly small. The inner diameter of the tube can be selected to be between the maximum width of the tube and the width of the insertion portion, and a small and lightweight 2° cylindrical member can be used.

On the other hand, corrugated fins 30 are attached between adjacent tubes 10. This corrugated fin 30
As with the conventional one, a thin aluminum plate or the like is bent and joined to the surface of the tube 10, and both ends of the tube 1o are inserted into the opening 21 of the cylindrical member 20, and the fins 30 are inserted into the tube 10. The end portion of the cylindrical member 20 is formed so as to be in contact with the surface of the cylindrical member 20. The tube 10 is
For example, it can be manufactured by extrusion molding an aluminum alloy material, but as shown in FIG. In order to do this, the tube 50 may have a structure in which no passage is formed on the edges on both sides to be removed by forming the stepped portions 15. As shown in FIG. When using a conventional material in which passages 51 and 56 are provided, for example, only the passage 51 within the range of the stepped lip 52 is used as a passage for the heat medium, and the remaining through-holes on both side edges of the tube are The holes 56 are not used as heat medium passages, but are used as internal holes to reduce the weight of the tube 50.
It can be used to increase the surface area of the tube 50 and contribute to improving the efficiency of heat exchange.

Next, in the tube 60 according to another embodiment shown in FIG.
The heat medium passage 61 is formed in the cross section of the tube 60, which is similar to the embodiment shown in FIGS. By forming the groove 66, protrusions 1167 and 68 extending horizontally from the upper and lower surfaces of the tube 60 are provided. To form the pair of protruding edges 67, 68, the same material as the tube material shown in FIG. 1 may be used, and the groove 66 and the protruding edges 67, 68 may be formed simultaneously during extrusion molding. When using an existing tube material having a passage 56 as shown in FIG. 2, the groove 66 is pressed into the protrusion 967 by adding roll processing or the like.
68 can be formed.

In this embodiment, grooves 66 are provided on both side edges of the tube 60.
The tube 60
It is possible to reduce the weight and increase the surface area of both side edges, thereby improving heat exchange efficiency. Also in this embodiment, since the corrugated fins 30 are attached to the upper surface of the tube 60, the effects of the fins 30 and the protruding edges 67, 68 can increase the effectiveness of heat exchange.

Next, the engagement structure between the tube and the cylindrical member will be described in detail with reference to FIGS. 4 and 5.

In the embodiment shown in FIG. 4, a simple horizontal groove is formed in the cylindrical wall of a cylindrical member 20 serving as a header in a direction perpendicular to its axis, and an opening 21 is formed therein. The width and height of this opening 21 are the same as the dimensions of the insertion portion 12 provided at the end of the tube 10. A stepped portion 15 in which the insertion portion 12 of the tube 10 is formed in the opening 21 of the cylindrical member 20
After being inserted and engaged until it contacts the outer peripheral surface of the cylindrical member 20, the engaging portions are joined liquid-tightly by appropriate bonding means such as brazing or welding to prevent leakage of the heat medium. In another embodiment shown in FIGS. 5 and 6, the cylindrical member 20
A recessed portion 26 is formed in a direction perpendicular to the axial direction, a flat surface is provided at the bottom of the recessed portion 26, and an opening 21 is formed with flat portions 25 left on both sides of this flat surface. This flat part 25
By providing this, when the insertion portion 12 of the tube 10 is inserted into the opening 21 of the cylindrical member 20, the stepped portion 15 of the tube 10 comes into contact with this flat portion 25, and the two are more securely engaged. . At this time, the engaging portions are bonded by appropriate bonding means such as soldering, and in this embodiment, since the bonding is done at the flat surface, a large bonding margin can be provided. As a result, the joint strength also increases, and the pressure resistance between the tube and the header can be improved.

[Operations and Effects of the Invention] As described above, the present invention provides a heat exchanger for a car air conditioner, a car cooler, etc. used as an air conditioner, which includes a tube having a heat medium passage inside and an adjacent tube. In a heat exchanger that has a basic structure in which corrugated fins are provided between the tubes and both ends of the tube are connected to a cylindrical member that is a header, a notch is provided on both edges of both ends of the tube over a predetermined length in the longitudinal direction. Since the step part and the step part are closer to the end of the tube than the remaining part of the tube, the insert part is inserted into the opening of the cylindrical member. To automatically regulate the relative position of the tube and the cylindrical member by inserting and joining the tube and the cylindrical member until the step part of the insertion part contacts the outer peripheral surface of the cylindrical member when the tube and the cylindrical member are inserted. Can be done. Therefore, when assembling the tube and the cylindrical member, no special jig or the like is required, and the assembly process can be simplified. Further, by bringing the stepped portion of the insertion portion into contact with the periphery of the opening of the cylindrical member, the joining margin is increased, and a more reliable joining can be achieved, so that the liquid-tight performance is also improved.

Furthermore, the dimensions of the opening provided in one cylindrical member can be made smaller in accordance with the dimensions of the insertion part, so the inner diameter of the cylindrical member is smaller than the maximum width of the tube, and the width of the insertion part is smaller than the maximum width of the tube. Since the size of the heat exchanger can be reduced to a size between 1 and 2, it is possible to use a smaller cylindrical portion than that of the conventional one, and the heat exchanger can be made smaller and lighter.

As the tube to be used, it is possible to make use of the both side edges of the tube that extend outward in the width direction of the insertion part, and to provide through holes in this part in parallel to the passage of the heat medium, increasing the heat exchange area. Achieve weight reduction of the scale and tube.

Further, by providing grooves on both side edges of the tube extending outward in the width direction of the insertion portion, projecting edges that protrude substantially parallel to the ends of both side edges in the width direction of the tube are formed. .

It is possible to increase the heat exchange area and improve heat exchange efficiency.

The structure of the opening provided in the cylindrical member may be a slit-shaped opening formed directly in the cylindrical wall.

A sufficiently strong connection can be achieved by abutting the stepped part of the tube insertion part, but it is also possible to form a depression in the cylindrical wall in a direction perpendicular to the axial direction of the cylindrical member, and to provide an opening in the center of this depression. In addition, the structure in which flat parts are provided on both sides has the effect of increasing the joint area with the insertion part of the tube and obtaining a more reliable liquid-tight connection.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts showing the structure of the heat exchanger of the present invention;
Fig. 2 is a perspective view showing the structure of one embodiment of the heat exchange element, Fig. 3 is a perspective view showing the structure of another embodiment of the heat exchange element, and Fig. 4 is an illustration of the joint structure of the tube and cylindrical member. 5 is a sectional view showing another embodiment of the joining and structure of the tube and the cylindrical member, FIG. 6 is a view taken along arrow A-A in FIG. 5, and FIG. 7 is a conventional It is a perspective view showing the whole structure of a heat exchanger. 10.50,60...tube, 11.51,61...passage, 15...step, 12
．． 52.62...Insert part. 2o...Cylindrical member, 21...Notch part, 25...Plane part, 30...Fin. 56...Through hole, 66...Groove, 67
．． 68...Protruding edge,

Claims (1)

[Claims] (1) A heat exchange section is formed by arranging a plurality of tubes with heat medium passages formed inside them in parallel, and attaching a corrugated fin made of corrugated plate material between the tubes. In a heat exchanger in which both ends of a tube are connected to a cylindrical member serving as a header, and a passage for a heat medium inside the tube is communicated with an inner cavity of the cylindrical member, a , a step is formed by providing a notch over a predetermined length in the length direction, and an insertion portion having a width smaller than the remaining portion of the tube is formed on the end side of the tube from the step. The cylindrical member has an inner diameter between the maximum width of the tube and the width of the insertion portion, and the cylindrical member has a slit-like shape having a size corresponding to the insertion portion. the tube is inserted into the opening until the stepped portion of the insertion portion formed at the end of the tube comes into contact with the outer peripheral surface of the cylindrical member, and the cylindrical member and the tube are A heat exchanger characterized by liquid-tightly connecting two.