JP3937361B2 - Combined heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite heat exchanger in which a heat exchanger for cooling engine coolant of an automobile and an oil cooler are integrated.
[0002]
[Prior art]
In an engine coolant cooling heat exchanger having an oil cooler, tanks are arranged at both ends of a heat exchanger core having a large number of fins and tubes, and the respective tubes are liquid-tightly fixed to the tube plate of the tank. An oil cooler is installed inside the tank, and inlet / outlet pipes provided at both ends of the oil cooler are passed through the tank, and the penetrating portion is sealed in a liquid-tight manner.
[0003]
[Problems to be solved by the invention]
A conventional heat exchanger for cooling an engine coolant with an oil cooler is one in which each heat exchanger is manufactured independently, and then the oil cooler is installed in the tank of the heat exchanger and its penetration is sealed. . As a result, the number of parts increases as a whole, and the assembly is troublesome.
Further, there is a possibility that leakage occurs in the seal portion.
In addition, the width | variety of the heat exchanger for motor vehicles is usually formed longer than the height on the structure arrange | positioned in an engine room. In the heat exchanger in which the tanks are arranged on both sides of the heat exchanger, the tank has a low height, so the space for installing the oil cooler becomes narrow, and there is a possibility that the cooling capacity of the oil cooler cannot be fully exhibited. .
Therefore, the present invention adopts the following configuration in order to solve these problems.
[0004]
[Means for Solving the Problems]
The composite heat exchanger according to the present invention has a pair of tanks arranged at a distance from each other and having an opening 1c for a first heat exchange medium in which an opening of an elongated tank body 1a having one open end is closed by a tube plate 1b. 1 and
Both ends penetrate through each of the tube plates 1b in a liquid-tight manner, and they consist of a large number of juxtaposed first tubes 2a communicating with each other in the pair of tanks 1 and a large number of fins 2b in contact with the outer surfaces thereof. Main core 2,
Parallel to the first tube 2a, both end openings thereof are liquid-tightly closed by the respective tube plates 1b without being communicated with the tank 1, and are fixed thereto, and a pair of second ends are provided at both end portions thereof. A sub-core 3 comprising a second tube 3b in which the inlet / outlet port 3a of the heat exchange medium is disposed and a fin 3c in contact with the outer surface thereof;
And the area occupied by the sub-core 3 is significantly smaller than the area occupied by the main core 2.
[0005]
According to the second aspect of the present invention, in the above-described configuration, the longitudinal direction of each tank 1 is arranged in parallel with the direction of gravity, and a pair of strength members 4 are fixed between both longitudinal ends of each tank 1. And
A plurality of the second tubes 3b are arranged in parallel, and they are communicated with each other at the entrance / exit 3a, and a second entrance / exit pipe 3d connected to the entrance / exit 3a is penetrated and fixed to the strength member 4,
The length of each tube 2a, 3b is formed sufficiently longer than the length of each tank 1.
[0006]
Further, in the present invention according to claim 3, each of the tank main bodies 1a is made of a synthetic resin molded body, and an opening edge thereof is fitted into an annular groove 1e on the outer periphery of the tube plate 1b via a sealing O-ring 1d. And their outer periphery is fixed by caulking,
On the outer surface of the portion of the tube plate 1b where both ends of the second tube 3b are fixed, a recessed portion 3e is formed that substantially matches the cross section of the second tube 3b, and the second tube is formed in the recessed portion 3e. The end of 3b is supported and fixed, and the end of the second tube 3b is liquid-tightly closed by the tube plate 1b.
In the present invention, the main core 2 is a heat exchanger core for cooling the engine coolant for automobiles, and the sub-core 3 is a heat exchanger core for oil cooling.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a composite heat exchanger according to the present invention, FIG. 2 is a longitudinal sectional view of an essential part thereof, and FIG. 3 is an exploded perspective view thereof.
In this composite heat exchanger, a main core 2 for cooling engine cooling water and a sub-core 3 as an oil cooler are integrally formed. The pair of tanks 1 are separated from each other left and right, and their longitudinal directions are arranged in parallel to the direction of gravity. The tank 1 includes a tank body 1a and a tube plate 1b. In this example, the tank body 1a has a long and narrow box shape made of a synthetic resin molded body. One end of the tank body 1a is opened, and a small flange portion projects slightly from the open end.
[0008]
Next, the tube plate 1b is formed of a press-formed body of a metal plate, and an annular groove 1e aligned with the outer periphery of the tank body 1a is provided in an annular shape. As shown in FIG. 3, a large number of tube insertion holes 2c are provided in the longitudinal direction. It is formed except for the lower end portion. And the recessed part 3e in which the outer surface side is recessed is formed in the lower end part. The tube insertion hole 2c is aligned with a first tube 2a described later, and the recessed portion 3e is aligned with the second tube 3b. At the end of the annular groove 1e, a large number of caulking protrusions are integrally projected.
[0009]
Next, the main core 2 includes a number of flat first tubes 2a made of metal and a number of corrugated fins 2b.
The sub-core 3 includes a small number of second tubes 3b, fins 3c fixed in contact therewith, a collar 3f and a second inlet / outlet pipe 3d for fluidly connecting the inlets / outlets 3a of the second tubes 3b. The second tube 3b is formed by superposing a pair of elongated plates having a U-shaped cross section in opposite directions and joining the connection portions in a liquid-tight manner to form a flat oil flow path therein. At the same time, the entrance / exit 3a is opened at both ends, and the entrance / exit 3a of each second tube 3b is connected by the collar 3f. Furthermore, one end of the second inlet / outlet pipe 3d is connected to the inlet / outlet 3a of the second tube 3b located at the lowermost end.
[0010]
Each second tube 3b is provided with an inner fin 3g for oil stirring. And while the edge part of each 2nd tube 3b is fitted in the recessed part 3e of the tube plate 1b, the edge part of the 1st tube 2a is fitted in the tube penetration hole 2c of the tube plate 1b. The corrugated fins 2b and 3c are brought into contact with the outer surfaces of the first tube 2a and the second tube 3b, and the contact portions of these parts are integrally brazed or fixed by soldering.
A pair of strength members 4 are arranged on the outermost sides of the main core 2 and the sub core 3, and both end portions thereof are joined to the outer surface of the tube plate 1b. Thicknesses of the strength member 4 and the tube plate 1b are sufficiently thicker than those of the first tube 2a and the second tube 3b. Note that the end portion of the second inlet / outlet pipe 3d passes through the lower strength member 4.
[0011]
The opening edge of the tank body 1a is fitted into the annular groove 1e of the core tube plate 1b integrally brazed or soldered in this way via the O-ring 1d, and the peripheral edge of the annular groove 1e. Is fastened and fixed to the tank body 1a by caulking to complete the composite heat exchanger.
As shown in FIG. 1, an inlet / outlet port 1c is integrally protruded and fixed to each tank body 1a. At the same time, an opening (not shown) for water supply is provided at the upper end of the tank 1, and a water supply cap 1f is fitted therein.
[0012]
The pair of inlets / outlets 1c of the tank 1 of the composite heat exchanger of the present invention thus configured is connected to a water jacket of an automobile engine via a hose (not shown). Oil such as automatic transmission oil or engine oil flows through the pair of second inlet / outlet pipes 3d of the sub core 3. A fan (not shown) is arranged facing each core, and they are erected and fixed at the front end of the engine room of the automobile.
Then, traveling air or cooling air from the fan flows through the main core 2 and the sub-core 3 to cool the engine cooling water in the first tube 2a and the oil in the second tube 3b.
[0013]
[Operation and effect of the invention]
In the composite heat exchanger of the present invention, the sub-core 3 is formed by the second tube 3b and the fin 3c, and both ends of the second tube 3b do not communicate with the tank 1, and the opening at both ends is the respective tube. The plate 1b is liquid-tightly closed and fixed . And the entrance / exit 3a is formed in the both ends of the 2nd tube 3b.
Therefore, in addition to the main core 2, the sub core 3 can be integrally formed with a very simple structure, and the second heat exchange medium flowing through the second tube 3 b may leak and flow into the tank 1. There is no. In other words, unlike conventional heat exchangers, a complicated structure such as providing a partition in the tank to make the sub-core independent from the main core is unnecessary, and a seal and other components are not required. Can be provided.
[0014]
In the second aspect of the present invention, since the second inlet / outlet pipe 3d of the sub-core 3 is fixed to the strength member 4 that connects the pair of tanks 1, an external force is applied to the second inlet / outlet pipe 3d. However, cracks and the like are prevented from occurring at the joint between the second inlet / outlet pipe 3d and the second tube 3b, and a highly reliable composite heat exchanger is obtained.
In addition, the length of the second tube 3b is long because it is sufficiently longer than the length of each of the pair of tanks, ensuring a sufficient heat radiation area of the secondary core 3 and promoting heat exchange in the secondary core 3. it can.
[0015]
Furthermore, the present invention according to claim 3 has a structure in which the end of the second tube 3b is supported and fixed to the recessed portion 3e provided in the tank 1, and the end of the second tube 3b is closed by the tube plate 1b. Therefore, the composite heat exchanger is simple in structure, easy to assemble and highly reliable.
Next, according to the present invention, the main core 2 is a heat exchanger core for cooling engine coolant for automobiles, and the sub-core 3 is a heat exchanger core for oil cooling. Cooling water and oil can be efficiently cooled at the same time.
[Brief description of the drawings]
FIG. 1 is a front view of a composite heat exchanger according to the present invention.
FIG. 2 is a longitudinal sectional view of the main part.
FIG. 3 is an exploded perspective view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tank 1a Tank main body 1b Tube plate 1c Entrance / exit 1d O-ring 1e Annular groove 1f Water supply cap 2 Main core 2a 1st tube 2b Fin 2c Tube insertion hole 3 Sub core 3a Entrance / exit 3b 2nd tube 3c Fin 3d 2nd entrance / exit pipe 3e Concave Part 3f Color 3g Inner fin 4 Strength member

Claims (4)

A pair of tanks 1 that are spaced apart from each other and have an opening 1c for the first heat exchange medium, the opening of the elongate tank body 1a, each of which is open at one end, closed with a tube plate 1b;
Both ends penetrate through each of the tube plates 1b in a liquid-tight manner, and they consist of a large number of juxtaposed first tubes 2a communicating with each other in the pair of tanks 1 and a large number of fins 2b in contact with the outer surfaces thereof. Main core 2,
Parallel to the first tube 2a, both end openings thereof are liquid-tightly closed by the respective tube plates 1b without being communicated with the tank 1, and are fixed thereto, and a pair of second ends are provided at both end portions thereof. A sub-core 3 comprising a second tube 3b in which the inlet / outlet port 3a of the heat exchange medium is disposed and a fin 3c in contact with the outer surface thereof;
A combined heat exchanger in which the area occupied by the sub-core 3 is significantly smaller than the area occupied by the main core 2. In Claim 1, while the longitudinal direction of each said tank 1 is arrange | positioned in parallel with a gravitational direction, between the longitudinal direction both ends of each tank 1 is fixed by a pair of strength members 4,
A plurality of the second tubes 3b are arranged in parallel, and they are communicated with each other at the entrance / exit 3a, and a second entrance / exit pipe 3d connected to the entrance / exit 3a is penetrated and fixed to the strength member 4,
A combined heat exchanger in which the length of each of the tubes 2a and 3b is sufficiently longer than the length of each of the tanks 1. In Claim 1 or Claim 2, each said tank main body 1a consists of a synthetic resin molding, The opening edge fits into annular groove 1e of the perimeter of said tube plate 1b via O ring 1d for sealing, Their outer periphery is fixed by caulking,
On the outer surface of the portion of the tube plate 1b where both ends of the second tube 3b are fixed, a recessed portion 3e is formed that substantially matches the cross section of the second tube 3b, and the second tube is formed in the recessed portion 3e. A composite heat exchanger in which the end of 3b is supported and fixed and the end of the second tube 3b is liquid-tightly closed by the tube plate 1b. The composite heat exchanger according to any one of claims 1 to 3, wherein the main core 2 is a heat exchanger core for cooling an automobile engine coolant, and the sub-core 3 is a heat exchanger core for oil cooling. .

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