JPH0443747Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present application relates to a plate-type heat exchanger used for cooling lubricating oil, etc. of an internal combustion engine.

[Conventional technology]

A plate-type heat exchanger has heat transfer fins placed between the upper and lower plates, each having two openings, through a sheet of brazing material, and consists of a flat tube and a ring-shaped short tube whose peripheral edges are crimped. Element cores, which are alternately stacked on a substrate having an inlet and an outlet for a cooling fluid, are liquid-tightly disposed within a casing having an inlet and an outlet for a cooling fluid. The fluid to be cooled is kept at an appropriate temperature by flowing a fluid to be cooled such as lubricating oil into the flat tube of the element core and a cooling fluid such as water to the outside of the flat tube. Such a plate type heat exchanger is shown in FIG. 1 of Japanese Patent Publication No. 55-48908, for example.

[The problem that the invention is trying to solve]

In the above-mentioned plate type heat exchanger, the uppermost part of the element core is free inside the casing, and when installed and used in an engine, etc., the vibration of the engine causes the upper part of the element core to become loose. It will vibrate with a large amplitude.
Therefore, a large force is applied to the fitting portion of the element core near the substrate. As a result, cracks and damage occur in the joints of the element core near the substrate, causing troubles in the engine and the like.
This phenomenon is noticeable when the element core is installed horizontally.

[Means for solving problems]

Short tubes and flat tubes formed by upper and lower plates with openings and having heat transfer fins are alternately stacked and integrated on a substrate with an inlet/outlet, and the inlet/outlet of the substrate is communicated with the inside of the flat tube. In a plate-type heat exchanger, an element core made of 300 ml of carbon dioxide is placed in a box-shaped casing with an open bottom and entrances and exits on both sides. A cylindrical boss is fixed to the casing, and a cylindrical part that projects upward and is closed at the upper end is provided on the upper wall of the casing, and the boss is fitted into the cylindrical part.

[Effect]

The element core is held in the casing via a boss at the top, and engine vibrations are transmitted from above and below the element core, resulting in the upper and lower parts of the element core vibrating as one with the same amplitude. Furthermore, the elastic body between the boss of the element core and the cylindrical portion of the casing absorbs the deviation of the central axes of the boss and the cylindrical portion, and absorbs the phase difference between vertical vibrations of the element core.

[Embodiment] FIG. 1 shows a plate-type heat exchanger showing an embodiment of the present invention, which is composed of an element core 20 and a casing 30. The element core 20 is formed by stacking and joining together a plurality of flat tubes 10 via short tubes 17 on a substrate 23 provided with an inlet 21 and an outlet 22 for the fluid to be cooled. The flat tube 10 is formed of upper and lower plates 12 and 14, has heat transfer fins 15 between the two plates, and is crimped around the outer periphery. The upper plate 12 has oil passage openings 11, 11 on both sides, and similarly, the lower plate 14 has oil passage openings 13, 13 on both sides. Short pipes 17, 17 are provided on the inlet 21 and outlet 22 of the substrate 23, and these short pipes 1
7, 17, the lower plate 1 of the flat tube 10
The peripheries of the openings 13 and 13 of the oil passage No. 4 are in contact with each other. Among the flat tubes 10 stacked in this manner, the uppermost one is not provided with oil passage openings 11, 11 in its upper plate 12. A cylindrical boss 25 is fixed to the uppermost flat tube 10, and the boss is provided with an annular groove 26 in the center of its outer peripheral surface. The boss 25 is covered with an elastic body 28 made of an elastic material such as rubber, which is cylindrical and has an annular protrusion 29 at the center of the inner peripheral surface. 29 are fitted.

The casing 30 is box-shaped with an open bottom surface, and has an inlet 32 and an outlet 33 for cooling fluid on both side walls.
It also has cylindrical parts 31, 31 which protrude upward from the upper wall and whose upper ends are closed. Furthermore, around the open bottom surface, there is a flange 3 that extends horizontally.
4, and the flange is provided with bolt holes.

The element core 20 and the casing 30 are assembled at the outer periphery with bolts 36 and nuts 37. 35 is Patsukin. In the assembled state, the boss 25 of the element core 20, which is covered with the elastic body 28, is fitted into the cylindrical portion 31 of the casing 30. In addition, the entrances 21 and 22 of the substrate 23
communicates with the inside of the flat tube 10.

When assembling the element core 20, a sheet-shaped brazing material is placed inside the flat tube 10, between the flat tube 10 and the short tube 17, and between the short tube 17 and the substrate 23, and the element core 20 is assembled into a furnace. By brazing inside, it becomes an integral brazed structure.

FIG. 2 shows another embodiment, in which a thick plate 45 with an opening in the center is inserted between the short tube 17 provided on the bottom surface of the flat tube 10 at the lowest stage of the element core 40 and the substrate 43. disposed via 46;
It is fixed with a stud bolt 44 and a nut 47. Inlet 41 and outlet 42 of the fluid to be cooled
are provided toward the lower side of the substrate 42. The other structure is the same as that of the first embodiment.

The lubricating oil flows into the flat tube 10 from the inlet 21, flows through the flat tube 10, and then exits at the outlet 2.
It flows out towards 2. Cooling water flows in from the inlet 32, flows between the flat tubes 10 and 10, and flows to the outlet 3.
Outflow towards 3. During this time, the lubricating oil and cooling water exchange heat with each other.

〔effect〕

As described above, according to the present invention, a boss is provided at the top of the element core and has a structure that fits into the cylindrical part of the upper wall of the casing, so that the top of the element core is held between it and the casing. , an amplified vibration of engine vibration is not caused in the upper part of the element core. Furthermore, since the structure is such that an elastic body is interposed between the boss of the element core and the cylindrical portion of the casing, no unreasonable force is applied to the element core both when the element core is attached to the casing and when it is attached. Therefore, even after long-term use, the joint portion of the lower part of the element core will not crack or be damaged, and troubles in the engine, etc. can be prevented.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of an embodiment of the present invention, and FIG. 2 shows a sectional view of another embodiment of the invention. 10...Flat tube, 17...Short tube, 20,
40... Element core, 21, 41... Inlet of fluid to be cooled, 22, 42... Outlet of fluid to be cooled,
23, 43...Substrate, 25...Boss, 28...Elastic body, 30...Casing, 31...Cylindrical part, 3
2... Cooling fluid inlet, 33... Cooling fluid outlet, 35... Packing.

Claims (1)

[Scope of utility model registration request] Short tubes and flat tubes formed by upper and lower plates with openings and having heat transfer fins are alternately stacked and integrated on a substrate provided with an inlet/outlet, and the inlet/outlet of the substrate is connected to the inside of the flat tube. In a plate-type heat exchanger, an element core made up of communicating elements is attached to a box-shaped casing with an open bottom and an inlet/outlet on both side walls. A plate-type thermostat characterized by a structure in which a cylindrical boss is fixed to the casing, and a cylindrical part that projects upward and is closed at the upper end is provided on the upper wall of the casing, and the boss is fitted into the cylindrical part. exchanger.