JPH1096595A - Round multi-plate oil cooler - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a round multi-plate oil cooler, a corrugation 5 formed on the surface of a round plate constituting an element thereof
Design the wave pitch and wave height in the optimum range to provide an efficient oil cooler. SOLUTION: A plurality of oil ports 3 and cooling water ports 4 are alternately arranged at intervals in a circumferential direction of a round plate 2, and a corrugation 5 is formed between adjacent ports. A wave form 5 having a wave pitch P of 4.25 mm or less and a wave height H of 1.0 mm to 1.4 mm. [Operation and effect] An oil cooler with good heat radiation performance and low oil-side pressure loss.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-plate oil cooler mainly mounted on an outer surface of an automobile engine, wherein a plate constituting the element has a circular shape.
It relates to a surface whose surface has a curved shape.

[0002]

2. Description of the Related Art A round multi-plate oil cooler mounted on an outer surface of an engine via a fastening bolt is formed in a dish shape having a hole for inserting a bolt at the center thereof, and is spaced apart in a circumferential direction to form an oil inlet / outlet and cooling water. A plurality of entrances and exits are alternately arranged. On the surface of such a plate, an uneven portion or a wave shape for oil stirring is formed.

[0003]

In the case where a wave shape for stirring oil is bent on the plate surface, the wave shape has an advantage of improving heat radiation performance, but the pressure loss increases when oil flows. Had disadvantages. Accordingly, an object of the present invention is to provide a high-performance oil cooler in which the height and pitch of a corrugated wave are set to optimal ranges, heat radiation performance is improved, and oil pressure loss is relatively suppressed. And take the following measures to solve the problem.

[0004]

The round multi-plate oil cooler of the present invention has a large number of plate-shaped plates 2 each having a circular outer periphery and having a center hole 1, and each of the plates 2 is arranged in a circumferential direction. A plurality of oil inlets / outlets 3 and cooling water inlets / outlets 4 are alternately arranged at intervals, and a corrugation 5 is formed in a bent shape on the front surface and the back surface between the adjacent entrances, and the wave pitch P of the corrugation 5 is 4.25 mm. Below, wave height H is 1.0mm ~ 1.4
mm, the corrugations 5 of the plates 2 vertically adjacent to each other are orthogonal to each other and contact each other at their intersections, and the outer peripheral edge and the hole edge of the center hole 1 are laminated in a liquid-tight manner. The oil passages 14 and the cooling water passages 15 are alternately formed on every other plate 2. Also,
According to a second aspect of the present invention, in the first aspect, the pair of oil inlets and outlets 3 are arranged 180 degrees apart from each other in the circumferential direction, and the pair of cooling water
They are arranged at a distance from each other.

[0005]

Next, an embodiment of an oil cooler according to the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view of the assembly of the oil cooler, and FIG. 2 is an enlarged cross-sectional view of the plate 2. FIG. 3 is a cross-sectional view showing an installation state of the present oil cooler.
It is cut along the line III. This oil cooler is
A large number of plates 2 are each shifted by 90 degrees in the circumferential direction with respect to each other, and are stacked at the center thereof with a spacer 6 interposed therebetween. Each of the plates 2 is formed in a circular dish shape on the outer periphery, and a divergent tapered portion 13 is formed on the peripheral edge. Also, a center hole 1 for bolt insertion is provided at the center,
The cooling water inlet / outlet 4 and the oil inlet / outlet 3 are 9
They are alternately arranged at a distance of 0 degrees. In the upper plate 2 in FIG. 1, a burring portion 12 is formed at the edge of the hole of the cooling water inlet / outlet 4, and the burring portion 12 does not exist in the oil inlet / outlet 3. The lower plate 2 is obtained by rotating the upper plate 2 by 90 degrees in the circumferential direction. Then, a large number of upper and lower plates 2 are stacked via spacers 6, and as a result, the burring portion 12 of the upper cooling water port 4 contacts the hole edge of the lower cooling water port 4.

[0006] In four fan-shaped planes existing between the cooling water inlet / outlet 4 and the oil inlet / outlet 3, corrugations 5 are respectively formed to bend. The ridge line directions of the respective wave forms 5 are all provided in parallel. FIG. 2 is an enlarged view of a cross section perpendicular to the ridge line direction of the corrugation 5. The wave pitch P of this wave form 5 is formed to be 4.25 mm or less, and the wave height H is 1.
It is in the range of 0mm to 1.4mm. When the wave pitch P and the wave height H are set to such values, an oil cooler having good heat radiation performance and small pressure loss due to oil circulation is obtained as shown in the experimental results described later. The plate 2 is made of an aluminum material as an example, and a plate whose both surfaces are coated with a brazing material made of an aluminum alloy is used. As shown in FIGS. 1 and 3, a number of plates 2 are stacked via spacers 6 while being shifted by 90 degrees in the circumferential direction, and end plates 8 are arranged at the uppermost end and the lowermost end in the stacking direction. Then, with the base 9 positioned on the lower end plate 8, the assembly is inserted into a high-temperature furnace, the brazing material on the plate surface is melted, and then the solidified material is used to separate the components from each other. Completely braze and fix to complete the oil cooler.

In FIG. 1, oil passages 14 through which oil flows from one oil port 3 to the other oil port 3 are formed on every other plate 2 as shown in FIG. At the same time, a cooling water passage 15 through which the cooling water flows is formed, and the cooling water flows in the cooling water passage 15 from one cooling water inlet / outlet 4 to the other cooling water inlet / outlet 4 in an arc shape. When the oil or the cooling water flows in an arc shape, respectively, the corrugations 5 are present in the flow passages, so that those fluids flow in a zigzag shape along the valleys of the corrugations 5.
As a result, the fluid is agitated and the heat transfer is improved. FIG. 3 shows a state in which the oil cooler is fastened and fixed to the engine 10 via fastening bolts 7. The oil flows in an arc from the oil hole 11 of the engine 10 through the oil passage 3 of each plate through the oil inlet / outlet 3 of each plate, and returns to the engine from the other oil inlet / outlet through the oil hole of the engine 10 (not shown). The cooling water flows from the inlet pipe (not shown) through one cooling water inlet / outlet 4 through the cooling water flow path 15 formed between the plates in an arc shape, and from the other cooling water inlet / outlet 4 through an outlet pipe (not shown). And it leaks. Then, heat exchange is performed while oil and cooling water flow through each plate.

[0008]

EXPERIMENTAL EXAMPLE In such an oil cooler, the range of the wave pitch P and the wave height H of the wave form 5 should be determined by the experiment in FIG. At this time, the plate 2 of the oil cooler used was made of an aluminum plate having a thickness of 0.5 mm, the diameter of the plate was 93 mm, and the center hole 1 was formed.
21mm, oil inlet / outlet 3, cooling water inlet / outlet 4 are 14mm, and the wave pitch P of corrugation 5 is 3.0mm, 3.75mm, 4.
For each of the five types of 0mm, 5.0mm, and 6.0mm, those with different wave heights from 0.2mm to 1.6mm in 0.2mm increments were prepared to form a round multi-plate oil cooler. Then, the oil flow velocity is V ₀ = 40 l / min, and the cooling water flow velocity is V _w =
The experiment was conducted at 30 l / min, with the oil temperature being 30 degrees higher than the cooling water temperature.

Then, the horizontal axis indicates the wave height, the vertical axis indicates the heat radiation amount Q ₀ and the oil side pressure loss ΔP _0, and plots the characteristics of each wave pitch and connects them with a smooth line. Is shown in FIG. In the same figure, five parallel characteristic curves located at the top indicate the relationship between the amount of heat radiation and the wave height, and four curves (two characteristic curves overlap to form one) shown at the bottom. Indicates the wave height and the oil-side (oil-side) pressure loss. The following is clear from FIG. Referring to the characteristic curve of heat radiation in FIG. 4, when the wave height is 1.4 mm or less at each pitch, the smaller the wave height, the more the amount of heat radiation continues to rise at a substantially constant slope. The wave height is 1.4mm
At higher points, the curve becomes closer to horizontal. Therefore, in order to improve the heat radiation performance, the wave height must be 1.4 mm.
You should:

However, the characteristic curve of the oil side (oil side) pressure loss shows that the wave height is 1.0 mm for each wave pitch.
As it gets smaller, it starts to rise sharply. Therefore, the wave height is preferably at least 1.0 mm from the viewpoint of reducing the oil-side pressure loss. As a result, a round multi-plate oil cooler having good heat radiation performance and relatively low pressure loss may have a wave height in the range of 1.0 mm to 1.4 mm.
Next, from the results of FIG.
In the range of mm to 1.4 mm, a characteristic curve was obtained as shown in FIG. 5, in which the abscissa represents the wave pitch and the ordinate represents the amount of heat radiation and the oil-side (oil-side) pressure loss. The following became clear from this characteristic curve. It was found that when the wave pitch was 4.25 mm or less, the rate of increase in heat dissipation performance was greater than the rate of increase in oil-side (oil-side) pressure loss. Conversely, when the wave pitch is in the range of 6.0 mm to 4.25 mm, the rate of increase in the oil-side (oil-side) pressure loss and the rate of increase in the heat radiation performance substantially match. However, when the wave pitch is 4.25 mm or less, the smaller the pitch, the larger the rate of increase in the heat radiation performance. From the results shown in FIG. 5, it is required that the wave pitch of the round multi-plate oil cooler having high heat radiation performance and relatively small pressure loss is 4.25 mm or less.

[0011]

In the round multi-plate oil cooler of the present invention, the oil flow path 14 formed between the laminated upper and lower plates 2 is agitated by the presence of the corrugations 5 which are perpendicular to each other, so that the heat radiation performance is improved. And a pressure loss associated with the flow of oil occurs. In the present invention, the wave pitch P is 4.25 mm.
And the wave height H is in the range of 1.0 mm to 1.4 mm, so that the heat radiation performance can be improved and the pressure loss of the oil can be kept relatively small, so that an efficient oil cooler can be provided. . That is, by setting the wave pitch P to 4.25 mm or less, the rate of improvement in heat radiation performance becomes greater than the rate of increase in oil pressure loss. The oil pressure loss starts to increase sharply when the wave height H becomes 1.0 mm or less, but the heat radiation performance keeps almost constant when the wave height H is 1.4 mm or less. Therefore, the wave height H
By setting the wave pitch P to 1.0 mm to 1.4 mm and the wave pitch P to 4.25 mm or less, it is possible to provide an ideal oil cooler having good heat radiation performance and relatively low oil pressure loss.

[Brief description of the drawings]

FIG. 1 is an explanatory view for assembling a round multi-plate oil cooler of the present invention.

FIG. 2 is an enlarged cross-sectional view of a plate 2 of the oil cooler.

FIG. 3 is a longitudinal sectional view showing an attached state of the present oil cooler, which is taken along line III-III in FIG.

FIG. 4 is a characteristic curve obtained by experimentally obtaining a relationship between a wave height of a wave form 5 of the present oil cooler, a heat radiation amount, and an oil-side pressure loss.

FIG. 5 is a characteristic curve showing a relationship between a wave pitch of a corrugated shape, a heat radiation amount, and an oil-side pressure loss based on the experiment of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center hole 2 Plate 3 Oil inlet / outlet 4 Cooling water inlet / outlet 5 Corrugated 6 Spacer 7 Fastening bolt 8 End plate 9 Base 10 Engine 11 Oil hole 12 Burring section 13 Tapered section 14 Oil flow path 15 Cooling water flow path

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroshi Yoneguchi 1-4-1 Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Inventor Atsushi Arisaka 1-4-1 Chuo, Wako-shi, Saitama No. Within Honda R & D Co., Ltd. (72) Inventor Tadamichi Aoyama 3-5-2-3 Yoyogi, Shibuya-ku, Tokyo Toyo Radiator Co., Ltd.

Claims (2)

[Claims] 1. A large number of plate-like plates 2 each having a circular outer periphery and having a center hole 1 are provided. Each of the plates 2 is circumferentially separated from each other so that an oil port 3 and a cooling water port 4 are alternately arranged. The corrugations 5 are bent and formed on the front and back surfaces between the adjacent entrances and exits, respectively, and the wave pitch P of the corrugations 5 is 4.25 mm or less, and the wave height H is in the range of 1.0 mm to 1.4 mm. The corrugations 5 of the plates 2 vertically adjacent to each other are orthogonal to each other and contact each other at their intersections, and the outer peripheral edge and the hole edge of the center hole 1 are joined in a liquid-tight manner and laminated. A round multi-plate oil cooler in which oil passages 14 and cooling water passages 15 are alternately formed for every two sheets. 2. The multi-piece structure according to claim 1, wherein the pair of oil ports 3 are arranged 180 degrees apart from each other in the circumferential direction, and the pair of cooling water ports 4 are arranged 180 degrees apart from each other. Plate type oil cooler.