JPH03156297A - Heat exchanger - Google Patents

Abstract

PURPOSE:To reduce a cost and to decrease a weight by providing a boxlike tank body and a header plate for blocking the opening of the body in a heater tank, forming the bottom wall of the body in a double structure, and evacuating the structure. CONSTITUTION:A header tank 2 has a boxlike tank body 6 formed of a peripheral wall 6a and a bottom wall 6b, and a header plate 7 for blocking the opening of the body 6. The body 6 is pressed from a metal plate in a box state. The peripheral edge of the opening is formed of both inner and outer shell members 8, 9 brazed to the plate 7, the entire peripheries 6a, 6b are formed in a double structure, and an interior between the members 8 and 9 is evacuated in vacuum. Since the bottom wall of the body is formed im the double structure and the structure is evacuated to have vacuum, noise can be prevented. Since the wall thickness of the member for forming the body can be reduced, the entire weight of the tank and heat exchanger can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a heat exchanger used as an intercooler for a turbocharger, for example.

In this specification, the term "front" refers to the lower side of FIG. 2, and the term "rear" refers to the upper side of the same figure. Furthermore, left refers to the lower side of Figure 3, and rear refers to the upper side of the same figure.

BACKGROUND ART Conventionally, intercoolers have been used in which a header tank includes a box-shaped tank body and a header plate that closes an opening of the tank body. by the way,
In recent years, header tanks with thinner walls have been used to reduce weight. However, the intercooler tends to vibrate due to the high-speed flow of supercharged air inside the intercooler and pulsations caused by engine vibrations, and the header tank in particular is susceptible to vibration. If the wall thickness is thin, there is a problem in that a large amount of noise is generated. Therefore, in order to prevent this noise, it has been considered to provide ribs on the wall of the header tank to increase rigidity, or to provide a baffle plate inside the header tank. However, in this case, there are problems in that manufacturing becomes troublesome, costs increase, and weight cannot be reduced.

An object of the present invention is to provide a heat exchanger that solves the above problems.

Means for Solving the Problems In the heat exchanger according to the present invention, the header tank includes a box-shaped tank body and a header plate that closes an opening of the tank body, and the bottom wall of the tank body is double-walled. In addition to the double structure, the inside of the double structure is vacuumed.

Example Embodiments of the invention will be described below with reference to the drawings.

The same parts and parts are denoted by the same reference numerals throughout the drawings, and their explanation will be omitted.

As shown in Figures 1 to 3, the heat exchanger (1) is arranged vertically in parallel between a pair of left and right header tanks (2) and both header tanks (2), and both ends are connected to the header tank (2). tank(
2), a plurality of flat tubes (3) extending in the left-right direction connected to It comprises corrugated fins (5) interposed between the mating tubes (3) and between both side plates (4) and the tubes (3) just inside thereof.

The header tank (2) has a peripheral wall (6a) and a bottom wall (
6b), a box-shaped tank body (6) consisting of a tank body (
6) and a header plate (7) closing the opening of the header plate (7). The tank body (6) is press-molded into a box shape from a metal plate, and is made up of both inner and outer shell members (Ii) (9), each of which has an opening peripheral edge brazed to a header plate (7), and a peripheral wall (6a). ) and the bottom wall (6b) as a whole have a double shell structure, and the interior between the membrane members (8) and (9) is vacuumed. Although not shown, a plurality of spacers are interposed between the two membrane members (8) and (9). The spacer consists of a convex portion integrally formed on the inner surface of one of the shell members (8) and (9). Header plate (
A rising wall (7a) is integrally provided on the peripheral edge of the outer shell member (9), and the outer surface of the peripheral wall portion of the outer shell member (9) is brazed to this rising wall (7a). Inside the rising wall (7a), elongated holes (10) are formed along the length thereof into which the ends of the tubes (3) are inserted. Further, although not shown in the drawings, reinforcing beads having a 0-shaped cross section are provided between adjacent elongated holes (10) and on the outside of the elongated holes (10) at both ends in an outwardly protruding manner.

The heat exchanger (1) is manufactured by brazing all the members together due to vacuum brazing properties, and at this time, the interior between the two membrane members (8) and (9) is made vacuum.

FIG. 4 shows a modification of the tank body. In the same figure,
In the tank body (20), the opening peripheries of both the internal and external members (8) and (9) are temporarily secured by winding them together in advance, and this seaming part (21) is brazed to the header plate (7). It is something that Then, the peripheral wall portion of the tank body (20) (
20a) and the bottom wall portion (20b) have a double shell structure, and the interior between the membrane members (8) and (9) is vacuumed. The degree of seaming of the seaming part (21) is such that a vacuum can be drawn between the two membrane members (8) and (9) during vacuum brazing.

Further, the tank body may be formed of a plate-like extruded material having a hollow portion with both ends open.

FIG. 5 shows another modification of the tank body.

In FIG. 5, the tank body (25) has a double structure tank body component (26) having an arc-shaped cross section and both side edges brazed to the header plate (7), and openings at both left and right ends. Tank body components (
26) and a metal end plate (27) brazed to the header plate (7).

The tank body component (26) consists of inner and outer shell members (28) and (29) which are press-formed from a metal plate to have an arcuate cross section and are brazed to the header plate (7).

A vacuum is created between both membrane members (H) (29). Therefore, the front and rear walls (25a) of the tank body (25)
) and the entire bottom wall portion (25b) have a double structure. In this modification, the end plate (27) may have a double structure and the inside of the double structure may be evacuated.

In the above embodiment, the tank body has a double structure other than the bottom wall, and the inside of the double structure is vacuumed.
The present invention is not limited to this, and it is sufficient that only the bottom wall portion has a double structure and the inside of the double structure portion is vacuumed.

Effects of the Invention According to the present invention, the bottom wall of the tank body of the header tank has a double structure, and the inside of the double structure is evacuated, so it is possible to prevent the generation of noise. Moreover,
Since the wall thickness of the members constituting the tank body can be reduced, there is no problem with reducing the weight of the header tank and, by extension, the entire heat exchanger.

[Brief explanation of the drawing]

Fig. 1 is a partially exploded perspective view showing an embodiment of the present invention;
The figure is an enlarged cross-sectional view along the ■-■ line in Figure 1, and Figure 3 is an enlarged cross-sectional view of
Enlarged sectional view taken along the line ■-■ in the figure with the middle part omitted, No. 4
The figure is a view corresponding to FIG. 2 showing a modification of the tank body, and FIG. 5 is a partially exploded perspective view showing another modification of the tank body. (2)...Header tank, (8) (20) (25
)...Tank body, (6b) (20b) (25b
)...Bottom wall part. that's all

Claims (1)

[Claims] The header tank includes a box-shaped tank body and a header plate that closes the opening of the tank body, and the bottom wall of the tank body has a double structure, and the inside of the double structure is a vacuum. Heat exchanger.