JP3763993B2 - Multi-plate oil cooler cooling element - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling element for a multi-plate oil cooler that can maintain rigidity while reducing the number of parts.
[0002]
[Prior art]
In a diesel engine mounted on buses, trucks, industrial vehicles, etc., an oil cooler Oc is disposed on the side of the engine block Eb as shown in FIG. 3A, and the cooling element Ce is covered as shown in FIG. It is attached to the side wall of the engine block by a flange F and faces the water jacket W, and the cooling water circulated from the radiator R by the pump P is taken in as indicated by the solid line arrow, while the engine sliding parts and bearings are taken from the oil pan Op. The oil sent to the part is taken in oppositely as indicated by the dotted arrows and heat exchange is performed to keep the oil temperature at a predetermined level.
[0003]
FIG. 4 shows a part of an example of a conventional multi-plate cooling element, that is, a tube body forming a single-stage (bottom-stage) oil passage separately, and is a stainless steel having a thickness of about 0.3 to 0.4 mm. A flat elliptical downward plate-shaped upper plate 1 made of a steel plate, a similar upward plate-shaped lower plate 2, and a perforated wave fin plate made of a steel plate with a thickness of about 0.3 mm disposed between them 3 and an oil guide plate 4 also serving as a curved ball-shaped reinforcement made of a steel plate having a thickness (about 3 to 4 mm) substantially equal to the height of the fin plate disposed opposite to both ends of the fin plate 3, and the same degree as this The spacer ring 5 made of a steel plate having a thickness of 5 mm is provided.
[0004]
The upper plate 1 is surrounded by a downward-facing edge wall 1a. Except for the uppermost plate, the upper plate 1 is provided with an upward pipe portion 1b that forms an oil inlet (right side in the figure) or an outlet (left side in the figure) at both ends in the longitudinal direction. At the same time, a plurality of pores 1d are provided around each pipe portion 1b to allow the molten brazing material to pass therethrough, and press processing is performed at intermediate positions of both end pipe portions 1b for the purpose of maintaining a gap and increasing the heat exchange area. On the other hand, the lower plate 2 is surrounded by an upward edge wall 2a, and downward pipe portions 2b serving as oil inlets or outlets are provided at both ends in the longitudinal direction. At the same time, a plurality of pores 2d for passing the molten brazing filler metal are provided around each of them, and the intermediate positions of the both end pipe portions 2b are pressed for the purpose of maintaining the distance and increasing the heat exchange area. A number of protrusions 2c are formed downward, and the fin plate 3 has a semicircular cutout at the center of both ends, and the arc shape of the curved oil guide plate 4 arranged on the left or right side thereof. A circular shape is formed with the inner peripheral surface, and the upper and lower plates 1, 2 are aligned with the upward or downward pipes 1b, 2b.
[0005]
A single tube body is formed by abutting the upper plate 1 and the lower plate 2 with the fin plate 3 and the oil guide plate 4 interposed therebetween, and this is laminated in a plurality of stages as shown in FIG. In this case, first, a copper brazing foil 8 having the same size and shape is first placed in the lower plate 2 in FIG. 4, and the fin plate 3 and the bent plate 3 are bent thereon. The ball-shaped oil guide plates 4 are placed side by side, and a copper brazing foil 8 of the same size is again placed on them, and the upper plate 1 and the lower edge wall 1a of the upper plate 1 are the upper edge walls 2a of the lower plate 2 from above. To fit inside.
[0006]
In addition, when stacking the other stages formed in the same manner, as shown in FIG. 5, the spacer rings 5 are fitted on the outer sides of the upward pipe parts 1b at both ends of the upper plate 1 of the lower stage, and the upward pipe parts thereof are fitted. A plurality of layers are stacked such that the downward pipes 2b at both ends of the upper plate 1b are fitted inside the upper plate 1b, and a copper brazing foil of a predetermined size (not shown) is placed on both ends of the upper plate 1 of the uppermost one. The reinforcing plate 6 made of a steel plate is disposed via the lower boss plate 2b at both ends of the lower plate 2 and the center boss hole 7a of the diamond-shaped flange 7 made of steel plate is formed into an annular copper braze. The foil 8 (FIG. 4) is inserted and fitted, and a pair of screw rods 9 are inserted in the through holes 7b on both sides of the flange 7 with a small diameter annular copper brazing material interposed therebetween. A laminate of the stage are contained in a jig, by weigh is placed from above, is placed in a heating furnace, each member is brazed in a liquid-tight manner.
[0007]
As shown in FIG. 5, the cooling element Ce assembled as described above is a lid provided with an oil inlet pipe Fa and an outlet pipe Fb through a screw rod 9 of a flange 7 fixed to the lowermost lower plate 2. The oil that is attached to the flange F and the lid flange F is attached to the side wall of the engine block Eb, is disposed in the water jacket W, and is taken into the tube body of each stage of the cooling element Ce from the inlet pipe Fa. It is used to cool with cooling water flowing in the water jacket W.
[0008]
[Problems to be solved by the invention]
In general, a high oil pressure ( ^{2 to} 8 kg / cm ² ) acts inside the tube body of a multi-plate type cooling element, but the upper and lower plates are brazed and joined via fin plates and oil guide plates. In addition to improved transmission, the gap between the tube bodies is expanded and the outer brazed joint is prevented from peeling off. If there is nothing at both ends, the above-described conventional cooling element has the curved oil guide plate 4 disposed at both ends in each tube body, since this causes the phenomenon of blistering and separation of the joint. Or a spacer ring 5 is provided around each pipe part, which increases the number of parts, increases the weight and costs, and reduces the heat exchange surface only in the space dedicated to the oil guide plate and spacer ring. Yes.
[0009]
Therefore, the present invention maintains the rigidity of the tube body composed of the upper plate and the lower plate while reducing the number of parts without using a curved oil guide plate or spacer ring as in the past, and the weight of the cooling element. It is an object of the present invention to reduce the amount of heat and increase the heat exchange area, and to make it easy to produce the upper plate and the lower plate with the same shape as an inverted one at a low cost.
[0010]
[Means for Solving the Problems]
Based on the above-mentioned problems, the present invention provides, as a cooling element for a multi-plate oil cooler used in a vehicle or the like, firstly, an upper plate and a lower plate in which a brazing material is disposed on both surfaces of a core material, and a porous material disposed therebetween. Drawing of corrugated fin plate, providing upward pipe parts that make up the oil inlet or outlet at both ends of the downward plate-like body part of the upper plate and drawing the upper surface of the pipe part to match the upper surface of the pipe part A curved ball-shaped, arc-shaped, rectangular-shaped or elliptical-shaped protrusion, and a downward pipe portion that forms an oil inlet or outlet at both ends of the upward plate-shaped body portion of the lower plate and the outside of the pipe portion position lower surface matches the lower surface of the pipe section in drawing song ball-shaped, arcuate, form a rectangular or oval shaped recess, the upper plate and the lower with intervening the fin plate A single tube body is formed by matching the rates, and the lower pipe ends and the lower surface of the throttle recess at both ends of the lower plate of the upper tube body are the upper pipe portions and the upper surfaces of the throttle protrusions at both ends of the upper plate of the lower tube body. The tube bodies are laminated in multiple stages, and reinforcing plates are joined to both ends of the upper plate on the uppermost stage, while flanges are joined to the downward pipes on both ends of the lower plate of the lowermost stage and the constriction recesses. In addition, a column member made up of a squeezing protrusion and a recess is formed at both ends, and secondly, an upward protrusion is provided at the inner edge of the upward pipe portion at both ends of the upper plate of the laminated tube body, and A downward projection is provided on the inner edge of the downward pipe part at both ends of the plate, and the downward projection of the lower pipe part of the lower plate of the upper tube body is engaged with the upward pipe part of the upper plate of the lower tube body To one, it is characterized in that the upward projection of the upward pipe portion of the upper plate of the lower tube member is engaged with the downward pipe portion of the lower plate of the upper tube body stacking the tube body in a plurality of stages.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a single-stage (bottom-stage) tube body of the cooling element according to the present invention separately, and FIG. 2 shows a cross-section of the tube body laminated in a plurality of stages. From a clad material in which an oxygen-free copper sheet brazing material with a thickness of about 20μ is joined to both sides of a 0.5 mm thick stainless steel plate by a rolling pressure welding method, etc. It has an upward edge wall 11d in the periphery, and most of the length (about 90%) forms a rectangular downward dish-like body portion 11a. The wall plate maintains a space and increases a heat exchange area. A large number of protrusions 11e are provided upward, and a circular upward pipe portion 11b serving as an oil inlet (right side in the figure) or outlet (same left side) is provided at both ends of the dish-like body portion 11a. The right side of the right pipe portion 11b and On the left side of the left pipe portion 11b, that is, on the outer side of each upward pipe portion, a curved ball-shaped restricting projection 11c having a predetermined width whose upper surface coincides with the upper surface of the upward pipe portion 11b is an outer semicircular portion of each pipe portion 11b. It is formed by drawing so as to surround.
[0012]
Reference numeral 12 denotes an upward plate-shaped lower plate which has an elliptical shape the same size as the upper plate 11 and is made of oxygen-free copper on both surfaces of a stainless steel plate having a thickness of about 0.3 to 0.4 mm, as with the upper plate 11. It consists of a clad material of the same thickness to which a thin brazing material is joined, and has a downward edge wall 12d (see FIG. 2) around it, and most of the length (about 90%) is a rectangular upward dish-shaped body part 12a, and a large number of protrusions 12e are provided on the wall plate to maintain the distance and increase the heat exchange area, and oil inlets (right in the figure) are provided at both ends of the dish-shaped body 12a. ) Or a circular downward pipe portion 12b serving as an outlet (same as the left side), and the lower surface faces downward on the right side of the right pipe portion 12b and the left side of the left pipe portion 12b, that is, on the outer side of each downward pipe portion 12b. Predetermined to match the lower surface of the pipe portion 12b Music ball shaped aperture recess 12c of are formed by a drawing process so as to surround the outer semicircular portion of each pipe section 12b.
[0013]
The upper plate 11 and the lower plate 12 are in an inverted relationship, and except for the uppermost upper plate 11 and the lowermost lower plate 12, the inner edges of the upward pipe portions 11b at both ends of the upper plate 11 and the lower plate 12 At the inner edges of the downward pipe portions 12b at both ends, one or two (one in the figure) for positioning when the plates are stacked are provided with an upward projection 11f in the former and a downward projection 12f in the latter. . However, in FIG. 2, the positions of the protrusions 11 f and 12 f are shifted from those in FIG. 1 in order to facilitate understanding.
[0014]
Reference numeral 13 denotes a rectangular perforated corrugated fin plate made of a steel plate having a thickness of about 0.3 mm, between the downward plate-like body portion 11a of the upper plate 11 and the upward plate-like body portion 12a of the lower plate 12. The height of the two plate-like body portions that are in contact with the inner surface and the width substantially equal to the inner width of the two plate-like body portions are formed so as to cover a part of the pipe portions 11b and 12b at both ends.
[0015]
Moreover, 17 in Figure 1 is disposed on the lower side of the both end portions of the lower plate 12 of the lowermost, Thick rhombus shaped flange made of steel (about 6-8 mm), the center of the flange 17 beneath the lowermost A boss hole 17a for fitting the downward pipe portion 12b of the plate 12 is provided, and a through hole 17b is provided on both sides of the longitudinal axis of the flange 17 so as to insert a screw rod 18 and fix (braze) its head. and has, and around the upper edge of the boss hole 17a is surrounded by approximately heart-shaped base portion 17c provided in the wall thickness eccentrically inside, opposite side of the portion having no pedestal portion 17c is the lowermost A curved ball-shaped flat portion 17d with which the lower surface of the curved ball-shaped recess 12c of the lower plate 12 abuts is formed.
[0016]
Thus, the fin plate 13 is disposed between the downward plate-like body portion 11a of the upper plate 11 and the upward plate-like body portion 12a of the lower plate 12 in FIG. 1, and the upper plate 11 and the lower plate 12 are brought into contact with each other. A single tube body is formed and laminated in a plurality of stages as shown in FIG. 2. In this case, the downward projection 12f on the inner edge of the downward pipe 12b at both ends of the lower plate 12 constituting the upper tube body is formed as a lower tube body. While engaging the upward pipe portions 11b at both ends of the upper plate 11 forming the upper plate 11, the upward projections 11f at the inner edges of the upward pipe portions 11b of the upper plate 11 forming the lower tube body are connected to both ends of the lower plate 12 forming the upper tube body. A plurality of layers are stacked while each tube body is positioned by engaging with the downward pipe portion 12b .
[0017]
Further, a steel plate reinforcing plate 16 also serving as a hole blocking member is arranged from the upward pipe portion 11b at both ends of the upper plate 11 of the uppermost tube body to the curved ball-shaped restricting projection portion 11c provided on the left side or the right side thereof. On the other hand, the center boss hole 17a of the flange 17 is fitted to the downward pipe portion 12b at both ends of the lower plate 12 of the lowermost tube body, and the small diameter annular copper brazing material is interposed in the through holes 17b on both sides. The tube 18 is inserted and the laminated tube bodies are put together in a jig, placed on a jig, placed in a heating furnace, and each member is brazed to the liquid nectar. Thus, the cooling element Ce is formed.
[0018]
In that case, the lower pipe 12b at both ends of the lower plate 12 of the upper tube body and the lower surface of the curved ball-shaped restricting recess 12c are connected to the upper pipe 11b at both ends of the upper plate 11 of the lower tube and the curved ball-shaped restrictor. is joined to the upper surface of the projecting portion 11c, and the bottom of the lower surface of the lower plate 12 at both ends of the tube body is bonded to the upper surface of the base portion 17c of the flange 17 at the same time down pipe portion 12b has a boss hole 17a of the flange 17 are joined, and the lower surface of the tracks ball-shaped aperture recess 12c is to be joined to the tune ball-shaped flat portion 17d of the flange 17, the stiffness is granted by a drawing process at both ends of the laminated tube body i.e. cooling element Ce Further, a column member composed of a plurality of curved ball-shaped protrusions and recesses is formed.
[0019]
The cooling element Ce assembled as described above is attached to the lid flange F having the oil inlet pipe Fa and the outlet pipe Fb through the screw rod 18 of the flange 17 fixed to the lowermost lower plate 12. The lid flange F is attached to the side wall of the engine block Eb and disposed in the water jacket W. Oil from the inlet pipe Fa passes through the pipe portion on the inlet side of the cooling element Ce into the tube body of each stage. And is used to exchange heat with the cooling water flowing in the water jacket W so as to face the outside thereof. In that case, even if oil pressure, engine vibration, or the like is applied to the cooling element Ce, the rigidity is maintained by the columnar members formed of the curved ball-shaped protrusions and recesses formed at both ends, and the element swings. And the tube body is not damaged.
[0020]
In the illustrated example, the upper plate 11 and the lower plate 12 are shown as having an elliptical shape. However, the upper plate 11 and the lower plate 12 may have a rectangular shape, and protrusions formed at both ends of the upper plate 11 and the lower plate 12. Although the 11c or the concave portion 12c is shown as a curved ball shape, it may be an arc shape, a rectangular shape or an elliptical shape having a predetermined width and length. In addition, as the material of the upper and lower plates, a clad material in which a copper brazing plate is bonded to both sides of the core material is used. However, even if an electro copper plating treatment is applied, a copper brazing foil is further arranged between the members. You may make it do. Furthermore, in the illustrated example, the cooling element made of a stainless steel plate is exemplified, but it may be made of a Monel alloy or aluminum, and is not limited to the material.
[0021]
【The invention's effect】
Since the present invention is configured as the cooling element of the multi-plate type oil cooler as in claim 1, the rigidity and brazing of the cooling element can be achieved without using the conventional three-month shaped oil guide plate or spacer ring. The strength can be maintained sufficiently, the number of parts can be reduced, the weight can be reduced, and the shape of the upper plate and the lower plate can be reversed so that it is easy to produce and the cost can be reduced. If it has the effect and is configured as in claim 2, it is easy to assemble while positioning while positioning the tube bodies, and if there are a plurality of protrusions, the laminated tube body does not wobble and is easier to produce. .
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a single-stage tube body of a cooling element according to the present invention.
FIG. 2 is a cross-sectional view of the entire cooling element.
FIG. 3A is a perspective view showing a usage state of an oil cooler.
(B) is explanatory drawing which shows the arrangement | positioning state of a cooling element.
FIG. 4 is an exploded perspective view of a single-stage tube body of a conventional cooling element.
FIG. 5 is a cross-sectional view of a conventional cooling element.
[Explanation of symbols]
11 Upper plate 11a Down plate portion 11b Upward pipe portion 11c Restriction projection 11d Edge wall 11e Projection 11f Upward projection 12 Lower plate 12a Upward dish shape body portion 12b Downward pipe portion 12c Restriction recess 12d Edge wall 12e Projection 13 Fin Plate 16 Reinforcement plate 17 Flange Ce Cooling element

Claims (2)

An upward pipe comprising an upper plate and a lower plate with a brazing material disposed on both sides of the core material and a perforated corrugated fin plate disposed between them, and forming an oil inlet or outlet at both ends of the downward plate-like body portion of the upper plate Are formed at the outer positions of the pipe portions, and are formed into a curved ball-shaped, arc-shaped, rectangular or elliptical protrusion whose upper surface coincides with the upper surface of the pipe portion, and the upward plate-shaped body portion of the lower plate Downward pipe parts that form oil inlets or outlets are provided at both ends of the pipes, and at the outer positions of these pipe parts, there are curved ball-shaped, arc-shaped, rectangular or elliptical concave parts whose bottom surface matches the bottom surface of the pipe part. The upper plate and the lower plate are abutted to form a single tube body with the fin plate interposed therebetween, and downward pipe portions and throttle recesses at both ends of the lower plate of the upper tube body The lower surface is joined to the upper pipes on both ends of the upper plate of the lower tube body and the upper surfaces of the restricting projections to laminate the tube bodies in multiple stages, and the reinforcing plates are joined to both ends of the uppermost upper plate. On the other hand, a cooling element for a multi-plate oil cooler, wherein flanges are joined to the downward pipe portion and the concavity of the lower plate at both ends of the lowermost plate, and pillar members comprising constriction protrusions and concavities are formed at both ends.   An upward projection is provided at the inner edge of the upward pipe portion at both ends of the upper plate of the laminated tube body, and a downward projection is provided at the inner edge of the downward pipe portion at both ends of the lower plate. Is engaged with the upward pipe portion of the upper plate of the lower tube body, while the upward protrusion of the upper pipe portion of the upper plate of the lower tube body is engaged with the downward pipe portion of the lower plate of the upper tube body. The cooling element for a multi-plate oil cooler according to claim 1, wherein the cooling elements are stacked in stages.

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