JPH0443750Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an intercooler installed between an internal combustion engine and a supercharger, and is particularly based on the difference in thermal distortion between the cooler case and the flat tube. This item relates to preventing damage to the intercooler.

[Prior art and its problems]

An example of a conventional intercooler is one that consists of a cooler case made of cast aluminum, a heat exchanger core housed within the case, and a pair of tanks provided at both ends of the core. This heat exchanger core generally consists of a large number of flat tubes spaced apart in parallel, corrugated fins or plate fins arranged in contact between them, and tube sheets inserted and fixed at both ends of the flat tubes. Cooling water flows through the flat tube, and supercharging air flows through the outer surface of the flat tube. Then, heat exchange is performed between them to cool the supercharged air, which is then supplied to the internal combustion engine. Here, since the temperatures of the heat exchange medium flowing inside the flat tube and the cooler case are different, a difference in thermal expansion occurs between the two due to the temperature difference. Therefore, especially in large intercoolers, a curved metal plate is installed between the tube sheet and the cooler case to absorb the difference in thermal expansion. However, in relatively small intercoolers, the tube plate and the cooler case are fixed by means such as direct welding. Therefore, due to thermal expansion, a large amount of force is applied to the joint between the flat tube and the tube sheet.
Cracks sometimes occurred in the joints and flat tubes.

[Means to solve the problem]

Therefore, the present invention focused on the fact that the tube sheet attached to both ends of the flat panel can be joined by brazing on one side at a time, and utilizes this to create a structure for absorbing thermal strain between the tube sheet and the end face of the cooler case. The purpose of this invention is to provide a simple intercooler with a structure that eliminates the above-mentioned drawbacks by interposing rubber, and its gist is as follows.

That is, the cooler case 1 is arranged parallel to the cooler case 1, which has a supercharged air flow port 7 for introducing high temperature supercharged air opened in the thickness direction of the case, and core insertion ports 14 opened at both ends in the longitudinal direction. A core 15 having a plurality of flat tubes 2 for circulating cooling water and fins 3 disposed in contact between the flat tubes 2, 2, and a core 15 having a plurality of flat tubes 2 for circulating cooling water, and a core 15 having fins 3 disposed in contact with each other between the flat tubes 2, 2, and a core 15 having a plurality of flat tubes 2 and fins 3 disposed in contact with each other between the flat tubes 2, 2, and a core 15 having a plurality of flat tubes 2, 2 and 3 having fins 3 disposed in contact with each other. a pair of tube plates 4, 4a, which are in contact with each other so as to be in contact with each other, and each end of the flat tube 2 is inserted through a plurality of perforated holes so that the insertion portions thereof are joined in a fluid-tight manner. In the cooler, one tube sheet 4
Insert the end of the flat tube 2 into the tube plate 4 and the core insertion port 14 of the case 1, with the insertion portion liquid-tightly joined by a fixing means such as brazing or welding. A relatively thick annular thermal strain absorbing rubber 5 is interposed only between the mouth edge and both sides of the rubber are in close contact with each other, and then the end of the flat tube 2 is inserted into the other tube plate 4a. The insertion portion is liquid-tightly joined by the fixing means, and the other tube plate is connected to the other core insertion hole, and the heat strain absorbing rubber 5 is attached to each of the case 1 and the flat tube 2 in the use state. This intercooler is characterized in that it has a plate thickness sufficient to absorb the difference in elongation due to thermal expansion through elastic deformation.

[Example of idea]

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a plan view of this embodiment, FIG. 2 is a sectional view taken along the - arrow in FIG. 1, and FIG. 3 is a - arrow sectional view in FIG. 1.
It is an arrow sectional view.

The intercooler of this embodiment is a water-cooled intercooler, and a pair of cooling water tanks 6, 6 are removably fastened to both ends of the cooler case 1 via a tube plate 4 by stud bolts 12 and nuts 11, respectively. . This cooler case 1 is made of aluminum casting and is formed into a box shape with an open top end as shown in FIGS.
It is divided into two parts. Furthermore, core insertion ports 14 are opened at both ends of the cooler case 1 in the longitudinal direction. Inside this case 1 is a core 1 of a heat exchanger consisting of corrugated fins 3 and flat tubes 2.
5 is inserted, and the tube plates 4 and 4a, which are brazed and fixed to both ends of the core 15, are fastened to the rim of the core insertion port 14.

Therefore, the intercooler of the present invention can be manufactured in the following order.

First, a plurality of flat tubes 2 and corrugated fins 3 are brazed and fixed. Next, the tube plate 4 is fixed to only one end of the flat tube 2 by brazing or welding. In this state, the thermal strain absorbing rubber 5 formed in an annular shape is inserted into the inside of the tube plate 4 from the side without the tube plate and positioned as shown in FIG. 4. Then, insert these from the right side of the cooler case 1 as shown in the figure. Then, through the thermal strain absorbing rubber 5,
The tube plate 4 is brought into contact with one end surface of the core insertion port 14 of the cooler case 1, and the thermal strain absorbing rubber 5 is elastically deformed to a certain extent using a stud bolt 12 shown in FIG. 5 and a nut not shown in the figure. It is concluded that The thickness of the thermal strain absorbing rubber in this example is about 2 to 4 mm. The length of the flat tube is approximately 350 mm, and the temperature difference between the cooler case 1 and the flat tube 2 is approximately 100°C. This is determined because the difference in thermal expansion is 0.8 mm or less, and if the thickness of the thermal strain absorbing rubber 5 is within this range, the difference in thermal expansion between the two can be sufficiently absorbed.

Next, as shown in FIG. 5, the other end of the flat tube 2 is inserted through the heat-resistant packing 10 into the insertion hole of the tube plate 4a. Then, the tube sheet 4 and the end of the flat tube 2 are fixed by brazing or welding while cooling the area around the tube sheet so that the heat-resistant packing 10 does not burn out. Next, while loosening the bolt on the heat strain absorbing rubber 5 side,
As shown in FIGS. 5 and 1, the cooling water tank 6 is fastened to the outside of each tube plate 4a with a packing 9 and a nut 11. At this time, the amount of tightening of the thermal strain absorbing rubber 5 is made smaller than the amount of tightening during brazing of the tube sheets 4a described above, so that both tube sheets 4, 4a are evenly fastened to the cooler case 1. In this intercooler, supercharging air flows from the opening 7 side in FIG. 1, flows between the outer surface of the flat tube 2 and between the fins 3, and flows from the lower chamber 15 in FIG. Not supplied to internal combustion engines. During this time, heat is exchanged with the cooling water, which flows from one cooling water tank 6 through the flat tube 2 to the other cooling water tank 6.

In addition, in this embodiment, when the supercharging air is relatively low temperature, it flows through the tube plates 4, 4a and the cooler case 1.
Although there is a very slight risk of leakage from between the core insertion hole 14 and the core insertion hole 14, there is no problem in practical terms.

[Effect of idea]

The intercooler of the present invention has the above configuration and has the following effects.

(1) Even if the cooler case 1 expands thermally, the strain is absorbed by the elastic deformation of the thermal strain absorbing rubber 5, so cracks do not occur at the joint between the flat tube 2 and the tube plate 4, the tube plate 4, etc. You can prevent it from happening. Thereby,
The durability of the intercooler can be improved.

(2) In addition, the thermal strain absorbing rubber 5 used in this intercooler is inserted between the tube sheet 4 and the core insertion hole 14 of the case 1 after only one tube sheet 4 is joined to one end of the flat tube 2. Since it is interposed, there is no risk of this thermal strain absorbing rubber 5 being burned out during the joining work of the tube sheets 4 on either side, and its elasticity is ensured to absorb thermal strain of the cooler case. There is.

(3) Furthermore, since the thermal strain absorbing means of the present intercooler is implemented by the thermal strain absorbing rubber 5 and has an extremely simple structure, it is easy to manufacture and can be provided at low cost. At the same time, since the thickness of the thermal strain absorbing rubber 5 is sufficient to absorb the difference in thermal expansion between the cooler case 1 and the flat tube 2, the intercooler can be made compact and lightweight.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the intercooler of the present invention, Fig. 2 is a sectional view taken along the - arrow in Fig. 1, and Fig. 3 is a
FIG. 4 is a plan view showing the first step of manufacturing the present intercooler, and FIG. 5 is a plan view showing the second step. 1...Cooler case, 2...Flat tube, 3...
Fin, 4, 4a... Tube plate, 5... Heat distortion absorbing rubber, 6... Cooling water tank, 7... Opening, 8... Rib, 9... Packing, 10... Heat resistant packing, 1
1...Natsuto, 12...Studbolt, 13...
...Bolt hole, 14...Core insertion port, 15...Core, 16...Lower chamber.

Claims (1)

[Scope of utility model registration request] A cooler case 1 in which a supercharged air flow port 7 for introducing high temperature supercharged air is opened in the thickness direction of the case, and core insertion ports 14 are opened at both ends in the longitudinal direction;
A core 15 having a plurality of flat tubes 2 for circulating cooling water arranged parallel to each other and fins 3 disposed in contact between the flat tubes 2, 2, and the case 1.
The flat tube 2 is brought into contact with both opening end surfaces of the core insertion port 14 so as to be parallel to the surfaces, and each end of the flat tube 2 is inserted into a plurality of bored holes so that the insertion portions are fluid-tightly joined. In this intercooler, the end of the flat tube 2 is inserted into only one tube sheet 4, and the insertion portion is made liquid-tight by fixing means such as brazing or welding. In the joined state, a relatively thick annular thermal strain absorbing rubber 5 is placed only between the one tube plate 4 and the edge of one core insertion opening 14 of the case 1 so that both sides of the rubber are in close contact with each other. After that, the end of the flat tube 2 is inserted into the other tube plate 4a, the insertion part is liquid-tightly joined by the fixing means, and the other tube plate is inserted into the other core insertion hole. The thermal strain absorbing rubber 5 is configured to have a thickness sufficient to absorb the difference in elongation due to thermal expansion between the case 1 and the flat tube 2 through elastic deformation during use. An intercooler featuring: