JPH07190665A - Oil cooler - Google Patents

Abstract

PURPOSE:To uniformize flow of oil by a method wherein oil flowing between plates flows along a large number of parallelly provided protruding strips of predetermined shape of a first plate and diverges along a large number of protruding strips of a second plate in a direction normal to the protruding strips of the first plate so that the oil flows zigzag in a netlike state. CONSTITUTION:A large number of protruding strips 4 having the same height are formed side by side radially spirally on plates 1a, 1b constituting an oil cooler from the center toward the periphery thereof. The ridge lines of the spiral, protruding strips 4 constitute a porting of a spiral shape of a circumferentially smooth plane. The spiral shapes on the plates la and 1b have opposite directions, so that when both the plates 1a, 1b are stacked on one another, zigzag oil passages are formed by the protruding strips 4, 4 of the plates 1a, 1b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil cooler composed of a laminated body of circular plate-shaped metal plates, in which oil and cooling water flow every other plate.
In particular, the present invention relates to a structure in which oil and cooling water are evenly distributed in the flow passage.

[0002]

2. Description of the Related Art Conventionally, in this type of oil cooler, substantially circular plate-like plates having a hole in the center are superposed in opposite directions and joined by a small brazing flange portion formed on the periphery of each plate, Configure the element. The elements are laminated to form a flat oil flow passage and a cooling water flow passage inside. In such an oil cooler, it has been proposed to form corrugations on the plate surface in order to stir the fluid inside, and arrange the corrugations of the corrugations so that they intersect with each other between adjacent plates.

[0003]

The corrugations conventionally formed on the surface of a plate for stirring oil and cooling water have linear ridges, and the fluid flowing along the corrugations at any intersection. Although it moves from one plate to the wave troughs of the other plate and flows, there is a risk that it does not always flow uniformly and smoothly in each part of the plate.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention provides a cooling water and an oil which are uniformly and smoothly circulated on the surface of each plate and which are sufficiently stirred to promote heat exchange. In order to achieve that purpose, the following configuration is adopted. In the oil cooler of the present invention, a large number of circular plate-shaped plates 1a and 1b are laminated, and liquid-tightly joined at a peripheral edge portion 2 thereof to form an oil passage 3 having a flat cross section and a substantially flat plane inside. In the formed plate, each of the plates 1a and 1b is formed by arranging a large number of protrusions 4 of the same height in a radial direction from the center to form a waveform, and the respective waveforms are smoothly curved in the circumferential direction. The entire plane constitutes a part of a spiral shape, and the plates 1a and 1b adjacent to each other in the stacking direction have different spiral winding directions,
Further, it is characterized in that the respective waveforms are substantially orthogonal to each other and the intersections thereof are in contact with each other.

Further, in a preferred embodiment of the present invention, in addition to the above structure, a central hole 5 serving as an oil outlet and an oil communication hole 6 arranged apart from the central hole 5 are provided in each of the plates.
Is formed, a spacer 9 forming a letter 5 shape with the C-shaped portion 7 and the inverted L-shaped portion 8 is provided in the oil flow path 3, and the central hole 5 is provided in the C-shaped portion 7. The communication hole 6 is surrounded by the inverted L-shaped portions 8 and isolated from each other, thereby forming a substantially annular oil passage from the communication hole 6 to the central hole 5.
A pair of cooling water inlets / outlets 10, 10 are formed so as to sandwich the inverted L-shaped portion 8 of the spacer 9, and each of the plates 1 a,
1b every other flat oil passage 3 and cooling water passage
11 is formed so that the flow directions in the plate plane are opposite to each other.

Further, another embodiment of the present invention is the above-mentioned embodiment, wherein the inverted L-shaped portion 8 of the spacer 9 is further added.
The ribs 12 are formed in that portion so as to close the gap formed between the edge portion and the peripheral portion 2 of the plate. In addition to the above configuration, a small Δ portion 13 is integrally provided on the outer periphery of the C-shaped portion 7 of the spacer 9, and the small Δ portion 13 is provided between the tip edges of the adjacent protruding ridges 4 of the plate. It is adapted to be fitted into the Δ portion formed on the.

[0007]

In FIG. 1, the oil 27 flowing between the plates from the communication hole 6 flows along the plurality of juxtaposed ridges 4 of the respective first plates 1a, and the second oil 27 that comes into contact therewith Divide into many in the direction orthogonal to the ridges of the first plate 1a along the ridges 4 of the plate 1b,
As a result, as shown in FIG. 3, each line forms a mesh-shaped flow passage,
Oil flows through the flow passages uniformly and in a zigzag pattern over the entire surface of the plate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the H-H of this oil cooler in FIG.
FIG. 2 is a sectional view taken along the arrow showing the oil side flow passage, and FIG.
-I is a sectional view showing a cooling water side flow passage. Further, FIG. 3 is an explanatory view showing a crossing state of a large number of ridges 4 formed on the respective plates 1a and 1b. 4 is an assembly explanatory view of the plates 1a and 1b of the elements constituting the oil cooler, and FIG. 5 is a vertical cross-sectional view of the oil cooler viewed from the direction of arrow AA in FIG. 6 is shown in FIG.
FIG. 7 is a plan view of the oil cooler, and FIG. 8 is a front view of the oil cooler. This oil cooler has a large number of plates 1a and 1b laminated as shown in FIGS. 4 and 5, and a spacer 9 is installed only on the flow path side of the oil cooler so that every other plate has an oil flow path 3a. The cooling water flow paths 11 are formed alternately. Plate 1
Each of a and 1b is erected over the entire circumference so that the peripheral edge portion 2 becomes a divergent edge portion toward the tip end, and a circular center hole 5 is formed at the center, and it is slightly separated from it. Then, the communication holes 6 are provided on the respective planes.

Except for the peripheral portions of the communication hole 6 and the central hole 5, a large number of protrusions 4 having the same height are arranged in parallel in the radial direction from the center to form a corrugated line, and the ridge lines of the respective protrusions 4 are formed. It smoothly curves in the circumferential direction and the entire plane forms a part of the spiral shape. The plates 1a and 1b adjacent to each other in the stacking direction have mutually different spiral winding directions, and their ridge lines are substantially orthogonal to each other. Then, they are laminated so that the intersecting portions are in contact with each other. The amplitude of the waveform of the large number of protrusions 4 is half the height of the spacer 9. And the lower surface side height of the hole edge portion of the central hole 5 of the first plate 1a matches the lower surface height of the corrugation. The same applies to the heights of the communication hole 6 and the vicinity of the hole edge. Further, the height of the center hole 5 of the second plate 1b and the hole edge portions of the communication hole 6 and the vicinity thereof coincides with the height of the upper surface of the corrugation formed by the protrusion 4. Further, the hole edge portions of the cooling water inlet / outlet ports 10 arranged on both sides of the communication hole 6 are projected upward by half of the height of the spacer 9 in the first plate 1a and downward in the second plate 1b. The height of the spacer 9 is half that of the spacer 9.

Further, on the outer periphery of the peripheral edge portion 2, the central hole 5
On the diameter line connecting the communication hole 6 and the communication hole 6, the rib 12 projects upward by half of the height of the spacer 9 in the first plate 1a, and the rib 12 extends downward by half of the height of the spacer 9 in the second plate 1b. Just stick out. Then, as shown in FIG. 5 and FIG. 9, the respective ribs 12 have the plates 1a and 1b.
Touch each other at. Next, as shown in FIG. 4, the spacer 9 interposed between the plates 1a and 1b is formed in a C-shape by the C-shaped portion 7 and the L-shaped portion 8 as a whole. Small Δ portions 13 are integrally provided in a radial direction at a plurality of locations on the outer circumference of the portion 7. This small Δ portion 13 is the plate 1
It is fitted in the Δ portion formed between the tip edges of the protrusions 4 which are parallel to each other in the vicinity of the central hole 5 of a and 1b. Thereby, the oil is prevented from bypassing along the outer circumference of the C-shaped portion 7.

Further, as shown in FIG. 5, the plates 1a and 1b are alternately placed every other plate, and the peripheral portions thereof are overlapped with each other to be in contact with each other. In, the respective communication holes 6 are separated from each other to form an oil inlet, and on the outer surface side where the spacer 9 is not interposed, the hole edges of the respective communication holes 6 contact each other to form an oil communication portion. On the contrary, the cooling water inlet / outlet 10
As shown in FIG. 6, at the hole edge portion of each of the holes, the surfaces on which the spacers 9 are interposed are in contact with each other to form cooling water communication holes, and at the portions where the spacers 9 do not exist, the respective cooling water inlets and outlets 10 are An inlet / outlet is formed which is separated from each other and through which cooling water flows. As a result, oil 27
As described above, the entire circumference of the spacer 9 flows clockwise from the communication hole 6, flows from the opening 26 of the spacer 9 into the oil hole 16 of the hollow bolt 14, and flows downward. Oil 27
5, the oil flows from the oil holes 15 of the base 24 into the respective communication holes 6, flows down through the hollow bolts 14 through the respective plates, and returns to the engine block.

As shown in FIG. 2, the cooling water 28 flows counterclockwise from the upper cooling water inlet / outlet port 10 and flows into the lower cooling water inlet / outlet port 10 in the figure. Then, the cooling water flowing in from one pipe 29 (FIGS. 6 and 7) flows into the other pipe 29 through each plate. Then, the oil 27 is cooled while the oil 27 and the cooling water 28 flow through each plate. A lower lid 23 is arranged at the lower end of the laminated body of the plates 1a and 1b thus formed, and an upper lid 22 is arranged at the upper end thereof. The top lid 22
A spacer 18 for the upper lid is arranged between the center of the plate and the center of the stack of plates. A base 24 is fixed to the lower surface of the lower lid 23, and their contact portions are fixed to each other by brazing. The base 24 is provided with an oil hole and a center hole at positions aligned with the oil hole 16 and the center hole 5 of each plate, and an annular groove is formed in the peripheral edge on the lower surface side. Is fitted. And this base 24 sits on an engine block (not shown),
The oil outlet (not shown) communicates with the oil hole 15, and the oil inlet of the engine block communicates with the center hole.

That is, the base 24 is seated on the engine block, the hollow bolt 14 is inserted, and the bolt is screwed into the oil hole of the engine block, whereby the oil cooler is attached. In addition, as shown in FIG.
The anti-rotation piece 31 shown in FIG. 2 is provided so as to engage with a locking portion on the upper surface of the engine block (not shown). Further, a pair of pipes 29 are provided on the upper end of the upper lid 22 as shown in FIGS. 7 and 8, and communicate with the cooling water inlet / outlet port 10 of each plate.

[0014]

The oil cooler of the present invention is provided with each plate 1
A corrugation formed by a large number of ridges 4 juxtaposed on the planes of a and 1b is formed in a spiral shape, and the spiral winding directions are different between the plates 1a and 1b, and the ridge lines of the respective corrugations are almost the same. Since the intersecting parts are in contact with each other at right angles, the length of the ridgeline of each wave is longer than that of the conventional straight line, and the oil flowing inside is smoothly and evenly distributed to each part. Can accelerate the heat exchange. That is, the plates 1a, 1 contacting each other
Although each of the ridges 4 of b intersects each other, the number of the ridges 4 of the plate 1b intersecting one ridge 4 of the plate 1a is increased, and the oil is zigzag along the many ridges 4 of the plate 1b. It can be smoothly and uniformly distributed. This promotes heat exchange. Next, according to the invention of claim 2, in addition to the above configuration, since the flat oil passages 3 and the cooling water passages 11 are formed every other plate 1a, 1b, a spiral shape is formed even on the cooling water side. The corrugation allows the cooling water to flow evenly in each part.

Further, according to the third aspect of the present invention, ribs 12 are formed between the edge of the L-shaped portion 8 of the spacer 9 and the peripheral edge 2 of the plate, whereby a gap generated in the peripheral edge 2 is formed. Since it is configured to be closed, a partition is generated at that portion, and the oil can be surely flowed in a substantially annular shape, and the passage bypassed in the opposite direction can be closed. In the invention according to claim 4, a small Δ is provided on the outer circumference of the C-shaped portion 7 of the spacer 9.
Since the portion 13 is integrally projected, and the small Δ portion 13 is configured to be fitted into the Δ portion formed between the leading edges of the adjacent protrusions 4 of the plate, the portion 13 is formed along the outer periphery of the C-shaped portion 7. It is possible to prevent the oil from flowing and to uniformly flow on the plane of each plate 1a, 1b.

[Brief description of drawings]

1 is a sectional view of the present oil cooler taken along the line H-H in FIG. 5, showing an oil side flow passage.

2 is a cross-sectional view taken along the line I-I of FIG. 5, showing a cooling water side flow passage.

FIG. 3 is an explanatory view showing a crossing state of a large number of ridges 4 formed on each of plates 1a and 1b.

FIG. 4 is an assembly explanatory diagram of plates 1a and 1b of the elements that constitute the oil cooler.

5 is a vertical cross-sectional view of the oil cooler as viewed from the direction of arrows AA in FIG.

FIG. 6 is a longitudinal sectional view taken along the line EE of FIG.

FIG. 7 is a plan view of the oil cooler.

FIG. 8 is a front view of the same.

FIG. 9 is an enlarged view of part F in FIG.

10 is an enlarged view similar to FIG. 9 at a position adjacent to FIG. 9.

[Explanation of symbols]

 1a, 1b Plate 2 Peripheral part 3 Oil flow path 4 Projection 5 Center hole 6 Communication hole 7 C-shaped part 8 L-shaped part 9 Spacer 10 Cooling water inlet / outlet 11 Cooling water flow path 12 Rib 13 Small Δ part 14 Hollow bolt 15 , 16 Oil hole 17 Bypass valve 18 Spacer 19 O-ring 20, 21 Locking part 22 Upper lid 23 Lower lid 24 Base 25 Bolt head 26 Opening 27 Oil 28 Cooling water 29 Pipe 30 Space 31 Non-rotating piece

Claims (4)

[Claims] 1. A large number of dish-shaped plates 1a each having a circular shape,
In an oil cooler in which 1b are laminated and liquid-tightly joined at a peripheral edge portion 2 thereof to form an oil passage 3 having a flat cross section and a substantially annular flat surface inside, each of the plates 1a and 1b has a central portion. A plurality of ridges 4 of the same height are arranged in parallel in the radial direction to form a wavy shape, and the ridge line of the wave is smoothly curved in the circumferential direction so that the entire plane constitutes a part of a spiral shape. The plates 1a and 1b adjacent to each other in the direction are configured such that the spiral winding directions are different from each other, and the respective waves are substantially orthogonal to each other so that their intersecting portions are in contact with each other. Oil cooler. 2. The center hole 5 as an oil outlet and an oil communication hole 6 arranged apart from the center hole 5 are formed in each of the plates,
A spacer 9 forming a C-shape with the C-shaped portion 7 and the inverted L-shaped portion 8 is installed in the oil flow path 3 and the central hole 5 is formed.
To the C-shaped portion 7, the communication hole 6 to the inverted L-shaped portion 8,
By being surrounded and isolated from each other, a substantially annular oil flow path is formed from the communication hole 6 to the central hole 5, and the inverted L-shaped portion 8 of the spacer 9 is sandwiched between the pair of cooling water inlets and outlets 10. 10 is formed, and the flat oil flow path 3 and the cooling water flow path 11 are formed on every other plate of the plates 1a and 1b such that the flow directions in the plate plane are opposite to each other. Oil cooler. 3. The rib according to claim 2, wherein a gap formed between the edge portion of the inverted L-shaped portion 8 of the spacer 9 and the peripheral edge portion 2 of the plate is closed. 12 formed, oil cooler. 4. The small Δ portion 13 is integrally projectingly provided on the outer periphery of the C-shaped portion 7 of the spacer 9, and the small Δ portion 13 is adjacent to the protrusion 4 of the plate. An oil cooler designed to fit into the Δ portion formed between the tip edges of the.