JPH0443743Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a housingless heat exchanger such as an oil cooler for an internal combustion engine or hydraulic equipment.

(Prior Art) As a heat exchanger such as an oil cooler for an internal combustion engine, a so-called donut-shaped heat exchanger is known, such as the one disclosed in Japanese Utility Model Application No. 117810/1983. An example is shown in FIG. The oil cooler 30 accommodates a cooler core 34 inside a cylindrical housing 31 having a water inlet pipe 32 and a water outlet pipe 33, and communicates with an oil inlet 35 and an oil outlet 36. The cooler core 34 is constructed by caulking upper and lower annular plate-shaped plates having a central opening, closing the central opening with a collar 38 to form a cooler unit 39, and alternately stacking ring-shaped spacer plates 40 and the cooler unit 39. be. A hollow bolt 41 passing through a collar 38 and a spacing plate 40 is inserted into the oil cooler 30, and the oil cooler 30 is fixed to a base 43 together with an oil filter 42 placed on the oil cooler 30. The oil filter 42 receives the oil coming out of the oil outlet 36 from the oil inlet on its bottom surface, and returns the oil to the base 43 through an oil return passage 44 formed inside the hollow bolt 41.

(Problems to be Solved by the Invention) The conventional heat exchanger as described above has a large diameter because it is necessary to surround the outside of the cooler core with a housing that serves as a cooling fluid flow path. Since the oil filter is stacked above, the inlet and outlet for the cooling fluid must protrude laterally from the housing. This poses a major problem in terms of layout when installing the oil cooler to the internal combustion engine body, so there is a desire to provide the cooling fluid inlet/outlet pipe at a position separated from the internal combustion engine body by at least the height of the housing. Furthermore, the housing-type heat exchanger as described above requires many structural members such as a housing, spacer plates, and collars, resulting in a complex structure and a large weight.

In addition, Japanese Utility Model Publication No. 59-28219 discloses a heat exchanger without a housing, but the plate in this one is not circular but has a pair of tongue-like protrusions, which are overlapped. cooling water inflow chamber,
It serves as an outflow room. As described above, since the plate has a complicated shape and has a structure that protrudes laterally from the cylindrical effective heat exchange portion, it causes problems in terms of layout when installing the plate, similar to the above-described one.

(Means for solving the problem) The heat exchanger of this invention has layered cavities formed by stacking circular plate-shaped plates on top of each other.
Two communication pipes are connected to each other to form two fluid channels that communicate with each other, and first, second, and third fluid chambers are formed on the upper surface of the upper end plate through the upper end plate. A communication hole communicating with the first, second, and third fluid chambers is provided, and one passage of the two fluid flow paths is connected to the second fluid chamber.
The fluid chamber is connected to the fluid chamber and opened to the outside through a communication hole provided in the lower end plate, and the other fluid flow path is connected to the first and third fluid chambers through the communication hole in the upper end plate, and the first and third fluid chambers are connected to The three fluid chambers are opened to the outside through openings in the outer wall, and the second fluid chamber is opened to the outside through a central hole in the top cover.

(Function) The housingless heat exchanger of this invention has an oil filter stacked on the upper surface of the upper lid of the fluid chamber, and is fixed to the base of the engine body, etc. together with the oil filter using a hollow mounting bolt that passes through the center hole. be done.

One fluid, such as oil, flows from the base through the communication hole in the lower end plate, through one fluid passage, that is, the communication pipe that connects the empty chambers in every other layer, and enters the second fluid chamber from the communication hole in the upper end plate, at the center of the upper lid. It flows out through the hole and enters the oil filter. The other fluid, such as cooling water, enters the other fluid passage (another empty space every other layer and its communication pipe) through the first fluid chamber from the opening in the side wall, and flows out from the opening provided in the side wall of the third fluid chamber. do.

The above-mentioned housingless heat exchanger does not have a housing surrounding the heat exchange part, and the inlet and outlet of the cooling fluid are provided in the first and third fluid chambers above the heat exchange part. The diameter can be made small, and the inlet and outlet pipes for the cooling fluid can be provided above the heat exchanger body portion and separated from the base, thereby eliminating problems in the installation layout to the engine. Additionally, there is no conventional housing, spacer plate, collar, etc., making the structure simple and lightweight.

〔Example〕

An embodiment of this invention will be explained with reference to figures. 1st
The oil cooler 1 shown in FIGS. 2 and 2 has an odd number of dish-shaped plates 2 stacked in a face down position, and an upper end plate 7 having a center hole 8 on the upper end surface and a lower end plate 9 having a center hole 10 on the lower end surface are attached. ing. As shown in FIG. 3, the plate 2 has a circular annular bottom plate 2a provided with a central hole 3 having a flange 3a, and a flange 2b provided at the periphery of the bottom plate 2a. In the bottom plate 2a, through holes 4 with flanges 4a provided at 90° intervals and through holes 5 with flange seats 5a are alternately bored on the same circumference concentric with the central hole 3, forming four openings. . The flange 4a and the flange seat 5a may rise in opposite directions or in the same direction with respect to the bottom plate 2a, but it is sufficient that they are dimensioned so that they come into contact with each other when the flange 4a and the flange seat 5a are overlapped with a 90° offset. If necessary, small protrusions 6 are provided on the bottom plate to serve as reinforcement for supporting the space between the bottom plates or as turbulent flow generation means for improving heat exchange efficiency.

When the plates 2 are stacked on top of each other with their pitches shifted by 90 degrees, the flange 4a of the through hole 4 and the flange seat 5a of the through hole 5 of the adjacent plate come into contact with each other, causing the communicating pipe 11 (Figs. 1 and 2). becomes. Communication pipe 11
An even number of layers formed by overlapping plates 2 are formed in each cavity, two of each layer being alternately opposed to each other in the diametrical direction. An upper end plate 7 having a center hole 8 is provided on the bottom plate of the uppermost plate, and has a communication hole 7a communicating with the uppermost layer cavity and communication holes 7b and 7c communicating with two communication pipes penetrating the cavity. drilled. As shown in Fig. 4, an outer wall 12 is provided on the upper edge of the upper end plate 7 to form a cylindrical outer wall 12 made by rolling a thick plate and butt-welding both ends together. and outer wall 1
2 is provided with an internal partition wall 13 inscribed in two places, and the upper surfaces of the outer wall 12 and the internal partition wall 13 are connected to the central hole 1.
It is covered with a flat plate-like upper lid 14 having 4a. As shown in the figure, the inside of the internal partition wall 13 communicates with the uppermost layer cavity through the communication hole 7a of the upper end plate 7, and the center hole 14a of the upper lid 14.
The second fluid chamber 16 is communicated with the second fluid chamber 16 . Second fluid chamber 1
One side of 6 communicates with one communication hole 7b of upper end plate 7, and an opening 15a is bored in outer wall 12.
This becomes a fluid chamber 15. The other side of the second fluid chamber 16 communicates with the other communication hole 7c of the upper end plate 7 and the outer wall 1
An opening 17a is formed in the third fluid chamber 17. The lower end plate 9 is provided with a communication hole 9a that communicates with one of the two communication pipes in the lowermost empty chamber.

An oil filter 20 is placed on the upper lid 14 of the oil cooler 1, and each central hole 10, 3, 8, 1
It is attached to a base 22 on the internal combustion engine main body side with a hollow bolt 21 passing through 4a. The base 22 includes an oil inlet passage 22a communicating with the communication hole 9a and an oil outlet passage 22b communicating with the hollow passage 21a of the hollow bolt 21.

Oil flows from the oil inlet passage 22a to the communication hole 9.
a. It enters the empty chambers of each even-numbered layer through the communication pipe 11, enters the second fluid chamber 16 through the communication hole 7a, enters the oil filter 20 from the outer periphery of the bolt 21 in the central hole 14a, passes through the hollow bolt 21, and returns to the base 22. . Cooling water enters the first fluid chamber 15 from the opening 15a, enters the empty chambers of each odd-numbered layer from one side of the communication pipe 11 through the communication hole 7b, and enters the third fluid chamber 17 from the other communication pipe 11 through the communication hole 7c. It is sent out from the return opening 17a.

In addition to the above embodiments, plates may be stacked in a supine position, and the first, second, third
The outer wall and inner partition wall defining the fluid chamber are not limited to circular or oval shapes, but may have any shape.

[Effect of idea]

The housing-less heat exchanger of this invention has a circular plate shape with only a bottom plate with a central hole and an opening that communicates with the communication tube. Therefore, when stacking these, there is no risk of leakage, and a highly reliable heat exchanger is formed.
This plate eliminates the need for a housing, and the heat exchanger has a cylindrical outer shape determined by the outer diameter of the plate, making it small and lightweight. Furthermore, the opening positions of the outer walls of the first and third fluid chambers, that is, the piping installation positions are as follows:
It is separated from the engine body by the stacking height of the plates, and any position can be selected from almost the entire circumference of the outer wall. Moreover, since the first and third fluid chambers are provided, the opening position of the side wall can be determined without affecting the flow of fluid within the plate. Furthermore, when the oil filters are mounted one on top of the other, the upper cover on which the oil filters come into contact may be a flat plate, and the tightening force is received by the inner partition wall as well as the outer wall, so that good adhesion can be achieved and firm tightening can be achieved. Therefore, it is a small and lightweight heat exchanger with no fear of insufficient strength or leakage, and there are no restrictions on installing it on the engine and piping it, so it is especially suitable for heat exchangers such as those for automobile engines, which have a small installation space and require vibration resistance. It is advantageous as a vessel.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a cooling water passage in an embodiment of this invention, and FIG. 2 is a sectional view showing an oil passage in the embodiment of FIG. Figure 3 A and B are the plane of the plate and its sectional view taken along the line B-B, and Figure 4 is the first, second,
This shows the third fluid chamber, A-A in Figures 1 and 2.
FIG. FIG. 5 is a sectional view of a conventional heat exchanger. 2...Plate, 4...Through hole, 5...Through hole, 7
...Top end plate, 9...Bottom end plate, 11...Communication pipe, 1
2... Outer wall, 13... Internal partition wall, 14... Top lid, 15... First fluid chamber, 16... Second fluid chamber,
17...Third fluid chamber.

Claims (1)

[Claims for Utility Model Registration] (1) A circular dish-shaped plate with a central hole in the bottom plate, with flanges on the outer periphery and flanges around the center hole stacked one on top of the other, and having a central hole on the upper and lower end surfaces. The upper and lower end plates are fixed to form a layered cavity between each plate, and two communicating pipes are provided in each cavity to penetrate the cavity and connect the upper and lower adjacent cavities. The chambers are formed into two fluid passages that communicate with each other on alternate layers, a communication hole that communicates one of the fluid passages with the outside is provided in the lower end plate, and a cylindrical outer wall and a central hole are provided on the upper surface of the upper end plate. An upper lid and an internal partition wall that is inscribed in the outer wall at two points and partitions the inside of the outer wall into three chambers are provided to form first, second, and third fluid chambers, and the second fluid chamber and the one A communication hole for communicating the fluid passages of the first and second fluid chambers, and two communication holes for communicating the first and third fluid chambers with the other fluid passage are provided in the upper end plate, and the second fluid chamber is connected through the center hole of the upper cover. A housingless type heat exchanger in which the first and third fluid chambers are opened to the outside through openings provided in the outer wall. (2) The housing-less heat exchanger according to claim 1, wherein the communication pipe is formed of a flange integrally raised up from the periphery of the opening of the plate bottom plate.