JPS62293086A - Laminated type heat exchanger - Google Patents

Abstract

PURPOSE:To improve the heat exchange performance of the heat exchanger and to simplify the construction of the system by adding cooling fins for radiating heat absorbed by a heat exchanging fluid to carry out heat-exchange between a first laminated pipe group forming the passage of a fluid to be heat- exchanged and a second laminated pipe group forming a passage of a heat exchanging fluid. CONSTITUTION:Supercharged air which has been pressurized and heated flows into the group of first laminated pipes which is in a laminated state through an air inlet 6, and is distributed to respective laminated pipes as shown by arrow (d). Further, while supercharged air flows from one longitudinal end side of each laminated pipe to another end side thereof, supercharged air is heat-exchanged with cooling water flowing within a second laminated pipe group 11, and is cooled. Cooling water which has been heat-exchanged with the supercharged air of high temperature and the temperature of which has been raised is heat-exchanged with an air flow as a second heat exchanging fluid by means of cooling corrugated fins 13 provided in a heat-exchanging space B of the second laminated pipe group 11, and is cooled.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Application Field 1 The present invention is directed to a supercharged air-cooled JJ for a supercharged internal combustion engine, for example.
This article relates to a laminated heat exchanger that is used as an I-type heat exchanger.

[Prior Art] In an internal combustion engine that burns a mixture of fuel v1 and air in a cylinder, the output of the engine can be increased by pressurizing the combustion air.
Therefore, one countermeasure is to cool the supercharged air. l
] A heat exchanger (intercooler) is used.

An example of a conventional intercooler is shown in FIG. Its general structure is that a cooling water inlet boat 102 and an outlet port 103 are connected by a U-shaped flow channel 101a. .

A large number of laminated tubes as a heat exchange conite with a structure 1
01 in such a way that each cold 7Jl water passenger and outlet of adjacent laminated pipes are communicated with each other, and an exchange gap 104 is formed between adjacent laminated pipes to serve as a passage for supercharged air. V41) By combining the core part 110
This core part 110 forms a passage for supercharged air and has a casing 120 having an inlet 121 and an outlet 122.
It is constructed by being housed inside.

105 is a cooling fin built into the cavity 104, and 106 and 107 are cooling water inlets and outlets.

[Problems to be Solved by the Invention] When assembling the above-mentioned intercooler into a vehicle engine, the supercharged air cannot be effectively cooled unless a subradiator is installed as a cooling water radiator exclusively for the intercooler. Can not.

It is very difficult to incorporate a subradiator into a narrow engine room, and it also increases the price of the entire supercharged air cooling system and the ThuirZ cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multilayer heat exchanger which has improved cooling performance, has a compact external shape, and reduces the price and installation cost of the cooling system.

[Means for Solving the Problems] In order to achieve the above object, the laminated heat exchanger according to the present invention includes a group of laminated tubes forming a passage for a fluid to be heat exchanged and forming an inlet and an outlet of the fluid. , in a laminated heat exchanger formed by stacking and combining adjacent laminated tubes such that the outlet and inlet of the adjacent laminated tubes are connected and a natural exchange gap is provided between the adjacent laminated tubes, the first W1 of the said laminated pipe as a layered pipe.
- a second laminated tube having a passage for a heat exchange fluid having a lower temperature than the fluid to be heat exchanged and an inlet and an outlet for the fluid on the surface and the lower surface; and an outlet and an inlet of the adjacent second laminated tube; are connected, and between the phases n of the adjacent second laminated pipes @
A structure was adopted in which the two parts were laminated and combined so that a gap for replacement was provided.

[Function 1] The heat exchange fluid passing through the first laminated tube is deprived of heat from the heat exchange fluid flowing through the second laminated tube, which is laminated and combined on the upper and lower surfaces of the laminated tube, respectively. cooled down to humidity.

The heat exchange fluid absorbs or takes away heat from the fluid to be heat exchanged, and its heat exchange ability is reduced or lost. By exchanging heat with a passing second heat exchange fluid (generally air), its heat exchange capacity is restored, so that its heat exchange performance is always kept at a high level.

[Example] The structure of the present invention will be specifically described below based on the example shown in the drawings.

1 to 5 each show an intercooler as a laminated heat exchanger for a supercharged air cooling section of a supercharged gasoline engine.

The general body 84 of the intercooler has cooling water as a heat exchange fluid on the top and both sides of the first laminated pipe 1, which serves as a heat exchanger for cooling JJI of supercharged air, which is the fluid to be heat exchanged. The second 1-1 layer pipes 11 forming the passage 12 are stacked so that the cooling water directly contacts the laminated pipes 1 to form a heat exchange unit 8.
It is constructed by laminating and combining the water after interposing a natural exchange gap B for heat dissipation. A corrugated fin 13 for cooling is installed in the replacement gap B.

Note that both the first and second laminated tubes 1.11 have a flat shape.

The first laminated tube 1 has a planar shape with rounded ends at both ends, as seen in FIGS. Ta! lI A long rectangular shape that looks like a shallow tray as a whole.
The upper and lower tube plates 1A and 1B having one shape are joined together in a "middle skin shape" and brazed to form a shape.

Each of the tube plates 1A and 1B has a cup portion 4 at one end facing the direction 11 to form an inlet boat for supercharged air.
A and 4B are provided, and this cup part has a supercharging passage hole 4.
A or 4b is perforated. In addition, the other end has a cup portion 5A for forming an outlet boat for supercharged air.
or 5B and supercharging passage hole 5a or 5b/) (provided).

Furthermore, the tube plates 1A and 1B are formed with indentations directed toward the inside of the laminated tube 1 at locations somewhat inwardly separated from the supercharging inlet and outlet boat sections, respectively, and these indentations are joined together. Add sushi and serve cold.
11 water passage holes 6a and 6b are provided respectively.

Inside the first laminated tube 1 forming the heat exchange passage 2 for the fluid to be heat exchanged, an in-boo fin 3 having a corrugated or other suitable shape for cooling is sandwiched in a flat area excluding the above-mentioned uneven portion. ing.

Instead of the in-boot ins 3, ribs of any desired shape for cooling may be formed in advance on each of the tube plates 1A and 1B by a stamping method.

The second laminated tube 11 has a planar shape similar to the tube plate 1^ or 1B constituting the first laminated tube 1 on the upper and lower surfaces of the first laminated tube 1, respectively, and is somewhat shorter in length. The second tube plate 11A or 11B is
b) As shown in FIG. 3 as a cross-sectional view, brazing is formed by overlapping and joining.

At both longitudinal ends of the second tube plate 11A or 11B, there is a Reirou Suijin Robo T-14A or 14B and a Rei7
A JI water outlet boat 15A or 15B is provided, and each boat has a cooling water passage hole 14a or 14.
B is worn. , Cold 7J] The interval between the water inlet boat 1- and the outlet boat is set by leaving an arbitrary interval in the first laminated pipe 1. It matches the story.

The structure of the first and second tube plates (for example, aluminum plates with a thickness of 0.3 to 1 and around 6 mm are used, and are sample-shaped into the desired shape by press molding.

Heat exchange unit AJ! The method of assembling the intercooler as a T hJi body will be explained as follows with reference to FIG. Each tube plate 1^, IB.

The surfaces of 11A and 11B are clad with wax for brazing in advance, and a temporary assembly fixing jig (
Pipe plates 10 and 11C as end plates without an air inlet/outlet cup portion and cooling water passage holes are installed on the lower fixed platen (not shown), and then the tube plates 1A and the tubes constituting the second laminated tube are installed. Plate 11B, also tube plate 11
Pipe plate 1B that overlaps A and further constitutes the first laminated pipe
, and after repeating the procedure of stacking the tube plates 1^,
In place of the upper tube plate 1 of the first laminated tube forming the top layer, there is a tube plate 10 as an end plate lacking a force tap part, and a tube plate 110 is also substituted for the tube plate 11^. The series of f1!1 layer n operations is completed by accumulating more.

After that, a short piping vibro, 7.16, is connected to the air inlet hole and outlet hole opened in the tube plate 1D and the cooling water passage hole opened in the tube plate 110, respectively.
and 17 to complete the temporary assembly of the intercooler.

This temporary assembly was clamped between a pair of fixed plates (top 1) using fastening tools, and the brazing, which was maintained at the molten temperature of the waxwood, was cooled after being placed in the furnace, so that each part of the intercooler The brazing joint between the component sets n is completed at once. Instead of cladding each tube plate with a brazing filler metal, a method may be adopted in which a foil-shaped brazing filler metal is sandwiched between each component and then heated.

Fig. 6 shows an example of a supercharged air-cooled 7Jl system of a gasoline engine for self-service gasoline engine with supercharging 1f=l. The high-temperature, high-pressure combustion D1 gas generated in the engine cylinder 31 is transferred to the turbine 33A of the supercharger 33 interposed in the middle of the exhaust pipe 32.
It rotates at high speed and is directly connected to the rotating shaft of the turbine.
4733B. 1 Air creep 3
The combustion air flowing into the intake port of No. 4 and having dust removed therefrom is controlled by a T anorometer 35, and then transferred to a compressor 33B (of the supercharger 33) which is interposed in the middle of the intake pipe 3G.
After being pressurized by , it is cooled to a desired temperature by 7 Jl while passing through an intercooler 30 according to the present invention. The supercharged air compressed by heat insulation J') by the compressor 33B travels through the intake pipe 36, passes through the throttle valve 38 and three surge tanks, and has its pressure and flow rate adjusted.
It is sucked into the engine cylinder 31.

The water-cooled intercooler 30 is equipped with a forward bending brush eater 40, and an electric bomb 43 is installed in the middle of the cold water circulation pipes 41 and 42 that connect the two.
However, the engine's electronic Ill fill device (ECtJ)
b.

By being driven intermittently based on instructions from the combustion engine, the combustion supercharging air is automatically maintained at a desired temperature at all times. 37 is a sensor for detecting an abnormal decrease in the water level within the intercooler 30.

By installing the intercooler 30 above the engine cooling radiator, etc., it is possible to effectively send running air for cold parts into the replacement gap B. Of course, a strong υ1 cooling fan may be attached to both or one of the intercooler 30 and the subradiator 40.

Next, the heat exchange function of the above intercooler will be explained. The supercharged air, which has passed through the supercharger 33 and been pressurized to 1.6 to 1.8 degrees Celsius and heated to a maximum of 100 to 120 degrees Celsius, flows from the air inlet 6 of the intercooler 30 to the first layer in the stacked state. flows into one group of laminated tubes 1, and is distributed into each laminated tube 1 as shown by arrows (D) in FIGS. 2 and 5, and each ! 1! While flowing from one longitudinal end of the single-layer pipe to the other end, the first! i! It is cooled by heat exchange with the cooling water flowing inside the second laminated tube 11, which has a HA layer in contact with the upper and lower surfaces of the i-layer tube 1.

The supercharged air cooled to the desired temperature of 6A is sent to the air outlet boat 5.
The 1° cold rJl water sent from the air volume lower towards the engine cylinder 31 via the collection path consisting of the connection of A and 5B is passed through the cooling water inlet 16 as indicated by the arrow (E) in the figure.
The water flows into the intercooler 30, is distributed to each of the second laminated pipes 11 in a stacked state, and flows to the other end, and passes through a collection path consisting of the connection of the outlet boats 158 and 158 to the cooling water outlet. 11 and sent to the sub-radiator 40 by the action of the pump 43.

The cold 7J1 water, which has heated up by exchanging heat with rS humid supercharged air, is cooled down to the temperature of fEFl while passing through the subradiator 40. Sometimes, the heat exchange ability of the subradiator 40 becomes insufficient. However, the second laminated pipe 1 as a cooling water passage
In the first group, since the exchange gap B exists on the side that is not in contact with the first stack @1, the cooling water flows to the second stack @11.
At the same time, the heat transferred from the supercharged air is transferred to the air flow as the second heat exchange fluid passing through the exchange gap B. You can give it away.

Therefore, this intercooler is equipped with a so-called self-cooling mechanism for the heat exchange fluid, and its heat exchange performance is greatly improved compared to the conventional intercooler shown in FIG. 7 with the same external dimensions. It performs its role well even under high heat loads.

In the above example, the heat exchange fluid is supercharged air, and the heat exchange fluid is water, but when used as a heat exchanger other than an intercooler, a combination of these fluid types is necessary. It may be selected arbitrarily depending on the situation.

In addition, the planar shape and internal structure of the first and second laminated tubes 1 and 11, and the arrangement of the fluid inlet and outlet are subject to design changes as appropriate to correspond to the external dimensions and heat exchange performance required of the heat exchanger. However, the purpose of the present invention is effectively distantly related.

The laminated tube of the example has a reinforced structure with many uneven shapes as shown in the accompanying drawings, so it can be produced more efficiently and with a sufficiently low incidence of defective products. Even at the design stage, there is no need to give special consideration to product strength.

Furthermore, when used as an intercooler for an automobile engine, the improved heat exchange performance makes it possible to downsize the glue brush eater used exclusively for the intercooler.

[Effects of the Invention] As is clear from a comparison with FIG. 7, which is a partial longitudinal sectional view of the conventional example, the laminated heat exchanger having the above configuration has the following effects. A natural exchange gap 104 that forms a flow path for a fluid to be heat exchanged, and a laminated pipe 10 that forms a passage for a heat exchange fluid.
1, the present invention provides heat exchange between a first laminated tube forming a passage for a fluid to be heat exchanged and a second laminated tube forming a passage for a heat exchange fluid. The natural exchange gap B1. serves as a passage for the third heat exchange fluid to dissipate the heat absorbed by the heat exchange fluid. : Since cold IJI fins are newly added, when comparing conventional heat exchangers, the former has greatly improved heat exchange performance compared to the latter, and therefore, it is possible to make the system more compact.

[Brief explanation of the drawing]

Figures 1 to 5 all show an intercooler as a product mh + heat exchanger for use in a supercharged gasoline engine for automobiles, with Figure 1 being a side view and Figure 2 being a plan view. Figures 3 to 5 are (a)-(a) cross-section, (b)-([1) cross-section, and (c)--, respectively, of Figure 1.
(c) It is a sectional view. Figure 6 is a diagram of the cooling system for air supercharged by the supercharger. Figure 7 shows the partial wave flJiFl of a conventional intercooler.
This is a perspective view. In the figure 1...First laminated pipe 3.13...Fin
4a. 4b (5a, 5b) =-Inlet (outlet) of heat exchanger IIJ5 fluid 6.7...Inlet or outlet (piping) of fluid for heat exchange 11-...Second laminated pipe 14a 114b (
15A, 15B)...Inlet (outlet) of heat exchange fluid 16.17...Inlet or outlet (piping) of heat exchange fluid A...Heat exchange unit B...Gap for natural exchange

Claims (1)

[Scope of Claims] 1) A group of laminated tubes forming a passage for a fluid to be heat exchanged and having an inlet and an outlet for the fluid, in which the outlet and inlet of the adjacent laminated tube are connected, and the outlet and inlet of the adjacent laminated tube are In a laminated heat exchanger formed by laminating and combining layers with a heat exchange gap provided between them, a layer having a temperature lower than that of the fluid to be heat exchanged is provided on the upper and lower surfaces of the laminated tube as the first laminated tube. Forms a passage for heat exchange fluid,
A second laminated tube having an inlet and an outlet for the fluid is connected to the outlet and inlet of the adjacent second laminated tube, and the second laminated tube is used for heat exchange between the adjacent second laminated tubes. A laminated heat exchanger characterized in that each layer is laminated and combined so that a void is provided. 2) The laminated heat exchanger according to claim 1, wherein cooling fins are assembled in the heat exchange gap formed between the adjacent second laminated tubes.