JPH0443742Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a plate-type oil cooler for internal combustion engines.

(Prior art) A cylindrical putty-type oil cooler with a central opening is inserted into a hollow center hole provided in the bracket of an internal combustion engine, and is fixed by screwing an oil filter stacked on top to a hollow bolt. This is usually done. An example of such an oil cooler is disclosed in Japanese Patent Publication No. 55-48238. An example is shown in FIG. The oil cooler 30 has a cooler core 34 housed inside a cylindrical casing 31 having a cooling water inlet pipe 32 and a cooling water outlet pipe 33, and communicates with an oil inlet 35 and an oil outlet 36. The cooler core houses fins 37 on the inside, defines a center opening with a collar 38, caulks the upper and lower plates together to form a cooler unit 39, and has spacer plates 40 having communicating holes and cooler units 39 stacked alternately. It is.

(Problems to be Solved by the Invention) Such a conventional oil cooler requires reinforcing fins 37 and a collar 38 for partitioning the central opening in addition to the plate, and also requires a spacing plate 40. has a large number of parts, has a complex structure, and is heavy. Furthermore, since the casing 31 is required, the size and weight are increased. Furthermore, since the oil and water only come into contact with each other on the plane between the layers through the plates, it is difficult to increase the heat transfer area within a constant volume.

(Means for Solving the Problems) In order to solve the above problems, this invention eliminates the conventional fins, collars, spacing plates, and casings, and simply overlaps plates A and B to form the core of the oil cooler. It is intended to form a part, and has the following structure.

A short cylindrical flange is provided on the periphery of the central opening and the circular outer periphery, and the annular flat part between both flanges is
Two circular holes and two long holes parallel to each other in the radial direction are provided close to each other, and a flange is provided between one of the long holes and the other circular hole sandwiching the other long hole, A by providing multiple protrusions on other parts of the flat part.
A plate, flanges are provided in the other elongated hole and the other circular hole, and a plurality of protrusions are provided in positions that do not correspond to the protrusions of the A plate in other parts of the flat part to form a B plate, and the A plate and the B plate are are overlapped to connect the peripheral flanges as well as the flanges of the circular hole and the elongated hole to the peripheral edges of the circular hole and elongated hole in the next stage, and the top of the protrusion is brought into contact with the adjacent plate,
Two circular hole rows and two elongated hole rows formed inside the plate group thus formed are respectively an inflow path and an outflow path for the two fluids, and either one end of each inflow path or outflow path is connected to the outside. This is a plate-type oil cooler in which cover plates having communication holes communicating with the plate group and shielding the other end from the outside are fixed to the upper and lower end surfaces of the plate group.

(Function) The plate type oil cooler of this invention is attached to an internal combustion engine and is usually used with an oil filter stacked on top of it.

Oil enters one row of circular holes, for example, from the engine body through communication holes in the lower end plate. Since the circular holes and the elongated hole rows are connected by flanges at every other layer, the oil rises through one of the circular hole rows, and part of it is divided into every other layer to form a ring between the A and B plates. The oil flows, reaches the long holes in that layer, ascends through the row of long holes, collects oil, and exits from the communication hole in the upper end plate. It is then sent to the oil filter and returned to the engine via a pipe inside the central port. In each oil flow path layer, a flanged long hole that serves as a cooling water flow path is interposed between the circular hole and the long hole and acts as a barrier, so it does not flow from the circular hole to the long hole in a short circuit and flows inside the plate. It makes a nearly 360° circular detour around the central opening. The lower end of the long hole row and the upper end of the circular hole row are respectively a lower end plate,
Since it is isolated from the outside by the upper end plate, no oil passes through the plate group without passing through the laminar flow path between the plates.

In addition, cooling water enters another row of circular holes from the outside through the communication hole on the lower end slope and ascends there, and is blocked by the elongated hole and the flange of the circular hole that form the oil flow path and becomes even more spaced. The liquid flows annularly through the laminar flow path between the plates, gathers at the elongated hole, descends through the elongated hole array, and flows out through the communication hole in the lower end plate that communicates with the elongated hole. Inside each layer, a long-hole flange serving as an oil flow path acts as a barrier, and the cooling water in each layer detours between the plates in an annular manner. In this case, the upper end plate isolates the upper ends of the circular hole array and elongated hole array, which serve as cooling water flow paths, from the outside. By arranging the circular holes and elongated holes as described above, each row of circular holes is used as an inflow path and each row of long holes is used as an outflow path, so that the oil layer and the cooling water layer face each other in a clockwise direction and a counterclockwise direction. It becomes a flow,
Heat exchange can be performed efficiently through the plate flat portion.

The combination of the four communication holes provided in the upper and lower end plates allows the positions of the inlet and outlet of oil and cooling water and the flow direction to be selected, but the flow paths within each layer remain the same.

Furthermore, since the protrusions provided on the A and B plates are provided at positions that do not correspond to each other, they do not overlap and come into contact with the flat parts of the adjacent plates, acting as supports to support the bending of the plates, and creating turbulence in the flow. The inner portions of the protrusions protrude into the other fluid flow paths, instead of being tightened to promote heat exchange, so that the heat transfer area is increased compared to a case where only flat portions are used, and the heat exchange efficiency is also improved.

(Example) An example of this invention will be described with reference to FIGS. 1 to 6. FIG. 1 shows the A plate 2 of the plate type oil cooler 1 of this invention shown in FIGS. 2 and 3. Short cylindrical flanges 4a and 4b are provided around the central opening 3 and the circular outer periphery, and an annular flat portion 5 exists between them. On one side of the flat portion, circular holes 6, 7 and elongated holes 8, 9, which are substantially parallel to each other in the radial direction, are bored therebetween. Flanges 6a and 8a are provided in the circular hole 6 and the elongated hole 8 sandwiching the adjacent elongated hole 9 therebetween. Further, a plurality of protrusions 10 are provided. A in Figure 1
-A and BB cross sections are shown in Figure 2 A and B.

FIG. 3 shows the B plate 12. The central opening 3, the flanges 4a and 4b around the central opening 3 and the outer periphery, the circular holes 6 and 7 provided in the flat part 13, and the elongated hole 8,
9 is the same as A plate 2. and circular hole 7
and elongated hole 9 are provided with flanges 7a, 9a.
Further, the positions of the plurality of protrusions 14 are arranged so as not to correspond to the positions of the protrusions 10 on the A plate. Figure 4 A and B show C-C cross section of plate B, D
-D cross section is shown.

The A and B plates are stacked alternately in a face-down dish-like position (Fig. 6), and the flanges 4a and 4b are attached to each other,
The flanges 6a and 8a of the A plate are joined to the circumferential edges of the circular hole 6 and elongated hole 8 of the B plate, and the flanges 7a and 9a of the B plate are joined to the circumferential edges of the circular hole 7 and elongated hole 9 of the A plate, respectively. Also protrusion 10
contacts the flat portion 13 of the B plate, and the protrusion 14 contacts the flat portion 5 of the A plate. FIG. 6 shows a cross section of a portion where these circular holes and elongated holes are joined (EE cross section in FIG. 5). In the figure, arrow F indicates a passage for cooling water, and arrow G indicates a passage for oil. An upper cover plate 21 is fixed to the upper end surface of the plate group 20, and a communication hole 22 communicating with the long hole row 18 is bored, and the other long hole row 19 is made up of long holes 9 and circular holes 6 and 7. The two circular hole rows 16, 17 are closed. 23 is a guide cover that guides oil to an upper oil filter (not shown), and 23a (FIG. 5) is its external opening. A lower cover plate 24 is fixed to the lower end surface of the plate group 20. The lower cover plate 24 is dish-shaped and has a communication hole 2 in its bottom surface 24a that communicates with the circular hole 7.
5 is provided, and a water inlet pipe 24c communicating with the outside is provided on the peripheral flange portion 24b of the cover plate 24. Further, the bottom surface 24a is provided with a communication hole 26 that communicates with the elongated hole 9, and the flange portion 24b is provided with a water outlet pipe 24d that communicates the communication hole 26 with the outside. Furthermore, a communication hole 2 communicating with the circular hole 6
7 is provided on the bottom surface 24a. A partition plate 28 is provided inside the cover plate 24 to form a flow path between the water inlet pipe 24c and the communication hole 25, a flow path between the communication hole 26 and the water outlet pipe 24d, and a communication hole between these and the communication hole. Isolate 27. FIG. 5 shows a plan view of the plate type oil cooler constructed as described above. The external opening 23a communicates the communication hole 22 with an external oil filter (not shown).

In the plate-type oil cooler having the above structure, cooling water enters the circular hole row 17 made up of the circular holes 7 in the plate group 20 through the water inlet pipe 24c and the communication hole 25, passes between every other plate, and continues for a long time. Hole 9
The elongated hole row 19 leads to the communication hole 26 and the water outlet pipe 24d. On the other hand, oil enters through the communication hole 27, enters the circular hole array 16 made up of the circular holes 6, passes between every other plate, is collected in the elongated hole 18, passes through the communication hole 22, and enters the oil cooler from the external opening 23a. During this time, heat exchange takes place in the flat and protruding parts of the plate, and due to the presence of the long hole flange, water and
The oil passages are detoured approximately in an annular manner to form counterflow.

(Effects) The plate-type oil cooler of this invention forms alternating layers of water passages and oil passages simply by combining two types of approximately symmetrical plates, and uses the other elongated hole flange as a barrier. An annular flow path near the circumference can be formed in the direction in which the two fluids face each other, and the protrusions can strengthen the plates and improve heat exchange efficiency, making it possible to eliminate the need for conventional collars, spacers, fins, or separate housings. It is possible to reduce the size and weight without the need for other equipment, and to improve heat exchange efficiency.

[Brief explanation of the drawing]

Fig. 1 is an example of the A plate, Fig. 2 is a sectional view thereof, Fig. 3 is an embodiment of the B plate, Fig. 4 is a sectional view thereof, and Fig. 5 is a plan view of the plate type oil cooler of the present invention. , FIG. 6 is a sectional view thereof. 7th
The figure is a sectional view of a conventional oil cooler. 4a, 4b... flange, 6, 7... circular hole,
6a, 7a... Flange of circular hole, 8, 9... Elongated hole, 8a, 9a... Flange of elongated hole, 10, 14
...Protrusion, 21... Upper cover plate, 24... Lower cover plate, 22, 25, 26, 27... Communication hole.

Claims (1)

[Scope of utility model registration request] A short cylindrical flange is provided on the periphery of the central opening and the circular outer periphery, and the annular flat part between both flanges is
Two circular holes and two elongated holes parallel to each other in the radial direction are provided close to each other, and a flange is provided between one of the elongated holes and the other circular hole with the other elongated hole in between. , a plurality of protrusions are provided on another part of the flat part to form an A plate, flanges are provided in the other elongated hole and the other circular hole, and flanges are provided in the other part of the flat part at positions that do not correspond to the protrusions of the A plate. A plurality of protrusions are provided to form a B plate, and the A plate and B plate are overlapped to connect the flanges on the periphery, and the flanges of the circular hole and the elongated hole to the periphery of the circular hole and elongated hole in the next stage, and the protrusions are The top portion is brought into contact with an adjacent plate, and two circular hole rows and two elongated hole rows formed inside the plate group thus formed are used as an inflow path and an outflow path for two fluids, respectively, and each inflow path,
A plate-type oil cooler comprising a cover plate that has a communication hole that communicates one end of the outflow path with the outside and blocks the other end from the outside, and is fixed to the upper and lower end surfaces of the plate group.