JPH08159685A - Laminate type heat exchanger core - Google Patents

Abstract

PURPOSE: To promote heat exchange by preventing a fluid from flowing along the peripheral edge of a plate by providing a projecting part on the external periphery of a ring-shaped spacer and constructing the projecting part such that it is adjacent to a tip end edge of a corrugated part on the center side of the ring shaped spacer. CONSTITUTION: Projecting parts 7a are formed on the outer periphery of a spacer 7 radially externally separated away by 90 degree each other. The projecting part 7a has a tip end edge thereof formed into a straight line and has both sides thereof disposed in close vicinity with a central side edge part in each corrugated part 2. As a result, cooling water or oil flowing among the plates is prevented from bypassing along the outer periphery of the spacer 7. A pair of upper and lower plates 6 are displaced by 90 degree peripherally and are laminated through the spacer 7. Hereby, a rejected part 22 in a hole edge of a first flow inlet/outlet hole 4 in the upper surface side plate 6 makes contact with a hole edge part of a second flow outlet/inlet hole 5 in the lower side plate 6 to construct a joint hole edge part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core of a laminated heat exchanger that does not require a casing, and is most suitable for an oil cooler, for example, in which high temperature oil and cooling water are independent flat flows. The present invention relates to a device that is introduced into a road and exchanges heat efficiently between the two.

[0002]

2. Description of the Related Art Conventionally, a device described in Japanese Utility Model Publication No. 53-41820 has been proposed as a casingless heat exchanger. This is a laminated type in which a large number of dish-shaped plates are in contact with each other at their peripheral edges and fluid passages are provided between the plates. Then, the first flow passage and the second flow passage are alternately formed every other plate. The circular plate, which is a component of this heat exchanger, has a first inflow / outflow hole whose peripheral edge is formed in a stepwise shape with a diverging end, and each hole edge portion is separated by 90 degrees in the circumferential direction and has a first height. Four second inflow / outflow holes having a second height are formed alternately. Then, the adjacent plates are displaced from each other by 90 degrees in the circumferential direction, the peripheral edge portion and the hole edge portion contact each other, and the first circulation hole of the upper surface side plate and the second circulation hole of the lower surface side plate. Are aligned so that they contact each other at the hole edges. This laminated heat exchanger
A large number of corrugations were formed on the flat surface of each plate in order to agitate the fluid flowing inside.

[0003]

The flat portion of such a plate-shaped plate laminate forms a corrugation for fluid agitation, but the peripheral portion thereof should be corrugated for the convenience of joining the plates. I can't. Therefore, more fluid circulated along the periphery of the plate having no corrugation, and there was a portion where it was not sufficiently stirred. Therefore, the present invention has an object to prevent the fluid from flowing along the peripheral edge of the plate to promote heat exchange, and has the following configuration to achieve the object.

[0004]

The core of the laminated heat exchanger of the present invention comprises a laminated body of the same plates 6, and each plate 6 is formed in a divergent plate shape having a tapered peripheral surface 1 at the peripheral edge. The bolt insertion hole 3 is provided in the center of the plate. Then, four first inflow / outflow holes 4 each having a first height and four second inflow / outflow holes 5 having a second height are formed alternately with each other by 90 degrees apart in the circumferential direction. To be done. At the same time, the wavy portion 2 is formed on the plate-shaped flat portion. And the plates 6 and 6 that are vertically adjacent to each other
They are displaced from each other by 90 degrees in the circumferential direction, and a ring-shaped spacer 7 is provided at the hole edge of the bolt insertion hole 3. As a result, the respective tapered peripheral surfaces 1 come into contact with each other. At the same time, the first inflow / outflow hole 4 of the upper surface side plate 6 and the second inflow / outflow hole 5 of the lower surface side plate 6 are aligned,
A pair of bonding hole edges 8 that contact each other at the hole edges and opening hole edges 9 that are separated from each other are alternately arranged in the circumferential direction and the stacking direction.

Further, the ridgelines of the flat corrugated portions 2 of the adjacent plates 6 are arranged so as to intersect with each other to form a laminated heat exchanger core. Here, a feature of the present invention is that the corrugated portion 2 is formed on a flat surface portion except for the peripheral edge portion of the plate 6 and the hole edge portions of the respective inflow / outflow holes 4 and 5. Then, a convex portion 7a is provided on the outer periphery of the ring-shaped spacer 7,
It is configured so as to be adjacent to the leading edge of the wavy portion 2 on the center side. Further, in a preferred embodiment of the present invention, a short circuit prevention portion 24 is provided in a part of a boundary portion between the tapered peripheral surface 1 and a plane adjacent to the peripheral surface so as to be recessed in the forming direction of the tapered peripheral surface. Thereby, a part of the annular peripheral space portion 34 formed on the peripheral portion between the plates is configured to be closed as much as possible. Furthermore, the corrugated portion 2 does not exist in the vicinity of the diameter line connecting between the pair of first inflow / outflow holes 4 and 4 and between the second inflow / outflow holes 5 and 5, and in the periphery of the hole edge portion of each inflow / outflow hole. The flat space portion 33 is formed in that portion between the respective plates.

[0006]

[Operation and effect] Between the upper and lower plates 6 and 6 to be laminated, the ring-shaped spacer 7 is interposed at the hole edge portion of the bolt insertion hole 3. Then, a convex portion 7a is provided on the outer periphery of the ring-shaped spacer 7, and the convex portion 7a is configured to be adjacent to the leading edge of the wavy portion 2 on the center side. Therefore, the gap between the outer periphery of the ring-shaped spacer 7 and the corrugated portion 2 is closed, oil or cooling water is reliably prevented from flowing in a short circuit along the outer periphery of the ring-shaped spacer 7, and heat exchange is promoted. . Further, the upper and lower plates 6 and 6 to be stacked each have an annular peripheral space portion 34 formed in the peripheral portion thereof as shown in FIG.
As shown in FIGS. 2 and 3, short-circuit prevention portions 24 and 24a are formed in a part of the circumference of the plate 6, so that they prevent the fluid from short-circuiting along the outer peripheral edge of the plate 6. As a result, the respective fluids are agitated by the respective wavy portions 2 and heat exchange is promoted. Since the corrugated portion 2 does not exist in the peripheral portion of each inflow / outflow hole of each plate and in the vicinity on the diameter line connecting each hole, since the flat space portion 33 is formed in that portion between each plate, There is an effect that the heat exchange medium is uniformly distributed and rectified in that portion, and the pressure loss of the heat exchange medium is reduced to promote heat exchange.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. 1 is a partial enlarged view of FIG. 6 showing a main part of a laminated heat exchanger core of the present invention. 2 is shown in FIG.
II-II arrow sectional view of FIG. 3, FIG. 3 is the same III-III arrow sectional view,
FIG. 4 is a sectional view taken along the line IV-IV. Further, FIG. 5 is an assembly explanatory view of the present heat exchanger core, FIG. 6 is a plan view thereof, and a sectional view taken along the line DD in FIG. 7. Further, FIG. 7 is a longitudinal sectional view of the heat exchanger core of FIG.
FIG. 8 is a sectional view taken along the line BB, and FIG. 8 is a vertical sectional view taken along the line BB. Further, FIG. 9 is an explanatory perspective view showing a mounted state of the present heat exchanger core, and FIG. 10 is a plan view of the same.

The core of the present invention comprises a laminated body of the plates 6 shown in FIGS. 5 and 6 and the spacer 7 interposed therebetween. Then, as shown in FIGS. 7 and 8, an upper lid 16 and a lower lid 25 are arranged above and below the laminated body, and a pair of cooling water pipes 19 are joined to the upper lid 16 to form a heat exchanger. . Plate 6 that constitutes the core of this heat exchanger
As shown in FIGS. 5 and 6, the whole is formed into a disk shape, and the outer circumference thereof is bent into an annular shape with a diverging end to form a tapered peripheral surface 1. In addition, a bolt insertion hole 3 is formed in the center of the plane of the plate 6, and a pair of second inflow / outflow holes 5 is provided on the diameter line, and a pair of first flow holes is formed in a direction orthogonal to the diameter line. An entrance / exit hole 4 is provided. The hole edge of the second inflow / outflow hole 5 is at the same height as the plane of the plate 6, and the hole edge of the first inflow / outflow hole 4 forms a concave portion 22 that protrudes inward with respect to the plane of the plate 6. , Its recess 22
The first inflow / outflow hole 4 is provided therein. A locking piece 20 is provided at the edge of the recess 22 so as to project.

Further, on the plane of the plate 6, a large number of juxtaposed corrugated portions 2 are formed on the inner surface side. The amplitude of the wavy portion 2 is the same as that of the concave portion 22 formed on the peripheral edge of the first inflow / outflow hole 4. Further, a short circuit prevention portion 24 is provided adjacent to the tapered peripheral surface 1 and on both sides of the pair of second inflow / outflow holes 5. The short-circuit prevention portion 24 protrudes toward the inner surface by the same amount as the amplitude of the wavy portion 2 and prevents the fluid from flowing along the tapered peripheral surface 1. Next, a spacer 7 is provided on the peripheral edge of the bolt insertion hole 3 between the pair of plates 6 and 6 which are laminated vertically. The inner diameter of the spacer 7 is equal to that of the bolt insertion hole 3, and the thickness is the wavy portion 2
Is formed to have the same amplitude or the depth of the recess 22.

Further, as shown in FIG. 5, convex portions 7a are formed on the outer periphery of the spacer 7 so as to be separated from each other by 90 degrees and outward in the radial direction. The protruding portion 7a has a tip edge formed in a straight line, and both sides thereof are arranged extremely close to the inner center side edge portion of each wavy portion 2 as shown in FIG. as a result,
The cooling water or oil flowing between the plates is prevented from bypassing along the outer circumference of the spacer 7. The pair of upper and lower plates 6 are displaced by 90 degrees in the circumferential direction as shown in FIG. Then, the concave portion 22 of the hole edge of the first inflow / outflow hole 4 of the upper surface side plate 6 comes into contact with the hole edge portion of the second inflow / outflow hole 5 of the lower surface side plate 6, so that the joining hole edge portion 8 (FIG. 7) is removed. Configure. At the same time, a gap is formed between the second inflow / outflow hole 5 of the upper surface side plate 6 and the first inflow / outflow hole 4 of the lower surface side plate 6,
The opening hole edge portion 9 is formed there.

The joint hole edge portion 8 and the opening hole edge portion 9 as described above.
Are formed alternately in the stacking direction and also in the circumferential direction. As a result, flat oil passages 28 and cooling water passages 29, which are independent from each other, are alternately formed between the plates 6 as shown in FIGS. 7 and 8, and the oil passages 28 and the cooling water passages 29 communicate with each other. To do. The tapered peripheral surfaces 1 of the upper and lower plates 6 are in contact with each other as shown in FIG. Then, the corrugated portion 2 of the upper surface side plate 6 and the corrugated portion 2 of the lower surface side plate 6 are orthogonal to each other, and as shown in FIGS. 2 to 4, the ridge line and the valley portion of the plate 6 are in contact with each other. In addition, the locking piece portion 20 that is provided so as to project at the hole edge of the first inflow / outflow hole 4 of the upper surface side plate 6
Is fitted to the peripheral edge of the second inflow / outflow hole 5 of the lower surface side plate 6, and is positioned so that the upper and lower plates 6 and 6 do not move in the circumferential direction. It is to be noted that the inner and outer surfaces of the respective plates 6 are preliminarily coated with a brazing material.
The upper lid 16 and the lower lid 25 and the base member 17 are arranged at both upper and lower ends thereof, and the cooling water pipes 19 are further provided in a pair of openings of the upper lid 16, and the components are held at appropriate positions. , The whole is inserted into a high temperature vacuum path, the brazing material coated on the surface in advance is melted, and then it is solidified, whereby the parts are integrally brazed and fixed.

Then, between the tapered peripheral surfaces 1, 1 of the upper and lower plates 6 and between the plate 6 and the upper and lower surfaces of the spacer 7, as well as the first inflow / outflow hole 4 of the upper plate 6 and the second inflow / outflow of the lower plate 6. The heat exchanger is completed by liquid-tightly joining the holes 5. Then, this heat exchanger is placed on the seat portion 23 on the engine block 15 through the O-ring 14 as shown in FIGS. 7 to 9, and the engaging portion 12 of the tongue portion 11 on the outer periphery of the heat exchanger is seated on the seat portion.
23 It is fitted to the locking piece 20 on the outer periphery and positioned in the circumferential direction. Then, the heat exchanger is attached to the engine block 15 by fastening the fastening bolts 13. Then, as shown in FIG. 7, the engine oil 26 flows in a semicircular shape in the flat oil passage 28 from one opening hole edge portion 9 of each plate 6, and from the other opening hole edge portion 9 into the engine block 15. Reflux to. Further, the cooling water 27 is the edge portion 9 of the oil opening hole.
Means that one cooling water pipe 19 (FIG. 8), which is displaced by 90 degrees in the circumferential direction, flows through the flat cooling water flow passage 29 as shown in the figure, flows out to the other cooling water pipe 19, and cools. Heat is exchanged between the water 27 and the oil 26.

Here, the peripheral edge of the heat exchanger is formed as shown in FIGS. 1 to 4, and its transverse cross section is adjacent to the tapered peripheral surface 1 as shown in FIG. To be However, short-circuit prevention portions 24 and 24a are arranged every other plate in the middle of the peripheral space portion 34, respectively. Therefore, in both the oil flow passage and the cooling water flow passage, the peripheral space portion 34 is partially blocked by the short-circuit prevention portions 24 and 24a. As a result, when the oil 26 and the cooling water 27 flow, the oil 26 and the cooling water 27 flow along the respective wavy portions 2 without bypassing the peripheral edge of the tapered peripheral surface 1 and flowing. That is, the oil 26 and the cooling water 27 flow in a zigzag shape along the vertically intersecting wavy portions 2 in each flat flow path, and flow in a semicircular shape as a whole, so that the flow path length of each heat exchange medium is increased. The heat exchange is promoted by increasing the length and stirring each. Further, the convex portion 7a prevents the oil or the cooling water from bypassing along the peripheral edge of the spacer 7 when flowing between the plates.

Further, in the peripheral portions of the first inflow / outflow hole 4 and the second inflow / outflow hole 5, in the vicinity of the diameter line connecting the second outflow / inflow holes 5, and in the vicinity of the diameter line connecting the first inflow / outflow holes 4, As shown in FIG. 6, a flat space portion 33 is provided. Therefore, the oil 26 and the cooling water 27 flow through each part of the corrugated part 2 and then merge with each other in the flat space part 33 to have a uniform temperature and flow into the other corrugated parts 2 or to the inflow / outflow holes. Therefore, the oil that flows through each part of the plate 26
Or, while keeping the temperature distribution of the cooling water 27 as constant as possible,
The pressure effect of each flow path is reduced.

[Brief description of drawings]

1 is a partial enlarged view of FIG. 6 showing a main part of a heat exchanger core of the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a schematic sectional view taken along the line III-III of FIG.

FIG. 4 is a schematic sectional view taken along the line IV-IV of FIG.

FIG. 5 is an assembly explanatory diagram of the heat exchanger core in which a part of each plate 6 is broken.

6 is a sectional view taken along the line DD in FIG.

7 is a vertical cross-sectional view taken along the line AA in FIG.

8 is a vertical cross-sectional view taken along the line BB in FIG.

FIG. 9 is a perspective explanatory view showing a mounted state of the heat exchanger core.

FIG. 10 is a plan view of the same.

[Explanation of symbols]

 1 Tapered peripheral surface 2 Wavy portion 3 Bolt insertion hole 4 First inflow / outflow hole 5 Second inflow / outflow hole 6 Plate 7 Spacer 7a Convex portion 8 Joining hole edge portion 9 Opening hole edge portion 11 Tongue portion 12 Locking portion 13 Fastening bolt 14 O-ring 15 Engine block 16 Upper lid 17 Base member 19 Cooling water pipe 20 Locking piece 22 Recessed portion 23 Seating portion 24 Short-circuit prevention portion 24a Short-circuit prevention portion 25 Lower lid 26 Oil 27 Cooling water 28 Oil flow path 29 Cooling water flow path 30 heat exchanger core 32 partition 33 flat space 34 peripheral space

Claims (3)

[Claims] 1. A peripheral edge is formed in a dish shape having a tapered peripheral surface 1 which is widened toward the end, a bolt insertion hole 3 is provided in the center, and the hole edges are separated by 90 degrees in the circumferential direction. The first inflow / outflow holes 4 having a height of 4 and the second inflow / outflow holes 5 having a second height are alternately formed, and the wavy portion 2 is formed in the dish-shaped flat surface portion. , The same circular plate 6 is laminated, and the upper and lower plates 6 and 6 adjacent to each other in the laminated body are displaced from each other by 90 degrees in the circumferential direction so as to form a ring shape at the hole edge of the bolt insertion hole 3. Since the spacer 7 is interposed, the tapered peripheral surfaces 1 and 1 are adjacent to each other, and
The first inflow / outflow hole 4 of the upper surface side plate 6 and the second inflow / outflow hole 5 of the lower surface side plate 6 are aligned with each other, and they are separated from each other by a pair of joining hole edge portions 8 that contact each other at the hole edge portions. In the laminated heat exchanger core, the edge portions 9 of the opening holes are alternately arranged in the circumferential direction and the stacking direction, and the ridge lines of the wavy portions 2 on the planes of the adjacent plates 6 are arranged to intersect each other. The corrugated portion 2 is formed on a flat surface portion excluding the peripheral edge portion of the plate 6 and the hole edge portions of the respective inflow / outflow holes 4 and 5, and a convex portion 7a is provided on the outer periphery of the ring-shaped spacer 7. Is configured so as to be adjacent to the tip edge of the corrugated portion 2 on the center side, the laminated heat exchanger core. 2. The short circuit prevention portion 24 according to claim 1, wherein a part of the boundary between the tapered peripheral surface 1 and the flat surface portion adjacent to the peripheral surface is recessed in the forming direction of the tapered peripheral surface 1 and a short circuit prevention portion 24 is formed. A laminated heat exchanger core formed so as to block as much as possible a part of an annular peripheral space portion 34 formed in the peripheral portion between the plates. 3. The pair of first inflow and outflow holes 4, 4 of each plate 6 and the vicinity of the diameter line connecting between the second inflow and outflow holes 5, 5 and each of the inflow and outflow holes 4, 5 according to claim 2. It is configured such that the corrugated portion 2 does not exist at the periphery of the hole edge portion,
A laminated heat exchanger core in which a flat space portion 33 is formed in that portion between each plate.