JPH09323007A - Cooling filter for lubricating oil of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling filter for lubricating oil of engine provided with filter elements installed in the central space of an annular heat exchanger for cooling lubricating oil of engine therein. SOLUTION: In this cooling filter, a water-cooled or air-cooled heat exchanger 1 for cooling lubricating oil of engine is formed in the shape of a ring, and in a central space 2c formed by being formed in the shape of a ring, cylindrical filter elements 3 for filtering lubricating oil cooled by the heat exchanger 1 are inserted. To the upper and lower end parts of the heat exchanger in which the filter elements 3 are installed, a cover 10 and a body 11 are fixed with arbitrary fixing means respectively to integrally form the heat exchanger and the filter elements 3, and the body 11 is fitted to an engine block.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine lubricating oil which is provided with a filter element inside the central space of a ring-shaped heat exchanger for cooling the engine lubricating oil (engine oil). The present invention provides a cooling and filtering device, and also provides a stacking ring-shaped heat exchanger that can be generally used for other uses for a cooling and filtering device for engine lubricating oil.

[0002]

2. Description of the Related Art Conventionally, engine lubricants are mixed with foreign substances such as metal powder, carbon, and sand, so these foreign substances are removed by an oil filter, and the lubricating oil is heated by the heat generated by combustion of the engine. Therefore, it is cooled by a heat exchanger. That is, the cooling and filtering of the lubricating oil has conventionally been performed by attaching a cooling / filtering device including a heat exchanger and an oil filter to the engine block as shown in FIG. In the apparatus, the lubricating oil O is pumped by an oil pump and the heat exchanger 100,
It circulates among the oil filter 101, the engine 102, and the one pan 103.

The heat exchanger is classified into a water cooling type and an air cooling type. The air-cooling type heat exchanger has the restriction that it cannot fully exhibit the cooling effect unless it is installed in a place where the vehicle's running wind is received. In order to exert the cooling effect, the oil passage should be long and the wind (air ) It is necessary to install in a place hit. On the other hand, in the water-cooled heat exchanger 100, the oil passage is shortened,
In order to make the whole compact, the engine block 10 is connected to the oil filter 101 through the body 104.
5 is installed.

That is, as shown in FIG. 7, a water-cooled heat exchanger 100 and an oil filter 101 are mounted on a body 104 provided in an engine block 105 so as to overlap each other by a center bolt 106. The center bolt 106 is inserted through the heat exchanger 100 and the lower screw 106
A is screwed to the body 104. And collar part 10
6b presses the heat exchanger 100, and is closely pressed to the body 104 via the gasket 107.

The oil filter 101 is screwed to the upper screw portion 106d of the center bolt 106 and pressed against the upper surface of the heat exchanger 100 via a gasket 108.

Then, as shown by the solid line in FIG. 7, the lubricating oil O flows from the engine block 105 into the oil inlet passage 109 of the body 104, enters the heat exchanger 100 through the inlet 110 thereof, and the lubricating oil O After cooling O, it flows into the oil filter 101 to filter foreign matter to become clean oil, which passes through the hollow portion 106c of the center bolt 106 and from the oil outlet passage 111 of the body 104 to the engine block 1.
Reflux to 05.

On the other hand, the cooling water W of the heat exchanger 100 flows in from the water inlet 112 of the heat exchanger 100 to cool the lubricating oil O of the heat exchanger 100 as shown by the broken line in FIG. Drained from.

The oil filter 101 in the above-mentioned conventional example is often a so-called spin-on type oil filter in which the entire oil filter 101 is attached / detached by the upper screw portion 106d. Besides the filter 101,
A filter element exchange type oil filter in which a case and a filter element are separately provided has also been proposed.

[0009]

The conventional cooling / filtering device for lubricating oil of an engine, which is connected to an oil filter, has the following problems. That is, in the conventional apparatus, the body 104, the heat exchanger 100, and the oil filter 101 are simply stacked in the vertical direction, and the height in the height direction is increased, and each has a separate exterior. It is hard to say that the whole is compact because of the large number of parts.

The conventional apparatus has a structure in which the central portion of the heat exchanger 100 is pressed by the flange portion 106b of the center bolt 106. Therefore, the center bolt 10 has high rigidity.
6 is required, and a reinforcing member 114 that resists the pressing of the center bolt 106 is required in the center of the heat exchanger, which prevents weight reduction and size reduction.

On the other hand, the oil filter 101 connected to the heat exchanger 100 of the conventional device is a case-integrated spin-on type oil filter 101.
Since No. 1 cannot be burnt at the time of disposal, disposal is becoming impossible due to environmental problems. Therefore, it has been proposed to separate the case and the filter element so that the filter element can be incinerated and discarded, but it is technically difficult to manufacture the filter element into a compact structure integrated with the heat exchanger.

[0012]

SUMMARY OF THE INVENTION The present invention provides a device having a compact structure in view of the problems of the conventional cooling and filtering device for engine lubricating oil. That is, according to the present invention, a water-cooling type or air-cooling type heat exchanger for cooling the lubricating oil of the engine is provided in a ring shape, and a lubrication cooled by the heat exchanger is provided in a central space formed by the ring shape. A cylindrical filter element for filtering oil is inserted, and a cover and a body are fixed to the upper and lower ends of the heat exchanger incorporating this filter element by fixing means, and the heat exchanger and the filter element are integrally provided. The present invention provides a cooling / filtering device for engine lubricating oil, characterized in that the body is attached to an engine block to solve the above-mentioned conventional problems.

Further, the present invention is used as a heat exchanger (heat exchanger 1c) of the cooling and filtering apparatus for the lubricating oil of the above-mentioned engine, and can also be used as a heat exchanger for other purposes. Half-pipe plates are stacked to form a plurality of ring-shaped flow passages in a plurality of stages, and a portion of every other flow passage is connected by a connecting pipe to form a high temperature fluid circulation flow passage. A process in which low-temperature fluid circulation channels are formed adjacent to each other in each stage, fluid inlets and fluid outlets are provided in a part of each circulation channel, and fluids with different temperatures are circulated in each circulation channel. Then, a stacking ring-shaped heat exchanger is provided, which is provided so as to exchange heat between fluids by heat conduction between adjacent flow paths.

[0014]

[Operation and effect] The most remarkable thing in the present invention is that
A ring-shaped heat exchanger was invented, a filter element was housed in the central space, a cover (lid) was fixed to the upper part of the heat exchanger, and a body was fixed to the lower part.

As described above, in the present invention, the heat exchanger has a ring shape, and the filter element is housed therein. Therefore, the heat exchanger originally exists in the portion of the filter element that serves as the case, that is, the heat exchanger also serves as the case, and thus space saving can be achieved.

Further, since the heat exchanger can fix the body and the cover (lid) by the fixing means provided on the upper and lower ends of the heat exchanger by itself, the conventional center bolt becomes unnecessary, and the problem due to it can be eliminated.

By arranging the heat exchanger on the outer periphery,
The area where the heat exchanger is in contact with air is increased, and the cooling performance by air can be improved, and the size can be reduced. Further, in the case of the present invention, there is also a feature that the air-cooling type heat exchanger and the water-cooling type heat exchanger can be compactly configured with substantially the same structure.

[0018]

Embodiment 1 (FIGS. 1 to 5) An embodiment of the present invention in which a heat exchanger is provided in a water-cooled manner will be described with reference to FIGS. Heat exchanger 1a (water cooling type)
, A plurality of water pipes 5 are arranged in the space between the inner and outer cylindrical bodies, an oil inlet 6 having a circumferential clearance is formed in the lower portion of the inner cylindrical body, and an oil outlet 7 is formed in the upper portion, and water is formed in the upper portion of the outer cylindrical body. The inlet 8 has a water outlet 9 formed in the lower portion, and is provided in communication with each of the water pipes 5,
(See Figs. 2 and 3)

For example, a bolt 21 is attached to the engine block 14.
The lower end of the heat exchanger 1a is fixed to the body 11 which is fixed by a fixing means such as tightening, and the oil inlet 6 and the oil inlet passage 15 of the body 11 are fixed by fixing means such as screwing of the male and female screw structure 12. Through (Fig. 5)

The cylindrical filter element 3 is inserted into the central space 2c of the heat exchanger 1a, and the cover 10 (FIG. 4) is fixed to the upper end of the heat exchanger 1a by a fixing means.
A cooling and filtering device for engine lubricating oil, comprising a filter element 3 pressure-bonded and fixed on a body 11 via a hollow space 4 and an oil outlet passage 16 of the body 11 in communication with each other.

The lubricating oil O of the engine 23 is replaced by the oil pan 24.
From the oil pump passage 25 of the body 11 through the oil inlet 6 into the heat exchanger 1a,
Cooled by the water pipes 5, fins 18, etc., enters the central space 2c from the oil outlet 7, permeates the filter element 3, is filtered and purified, and is returned from the oil outlet passage 16 of the body 11 to the engine 23 for circulation,

Further, the water W pumped by the water pump 26 is cooled by the radiator 27, enters the inside of the water inlet 8 of the heat exchanger 1a, returns through the water pipes 5 and returns from the water outlet 9, and circulates. , A cooling and filtering device for lubricating oil of an engine, which is provided to cool the lubricating oil O. (Fig. 1)

In order to increase the heat transfer area of the water pipe 5 of the heat exchanger 1a to improve the cooling effect, a large number of fins 18 are provided.
Are joined by press fitting or brazing, and a large number of slits or small holes 22 are formed in the fin 18 so that the lubricating oil O can flow through. (Fig. 3)

Reference numerals 19 and 20 denote gasket packings interposed to prevent the leakage of the lubricating oil O.

The cover 10 is detachably fixed to the heat exchanger 1a by a fixing means such as screwing of the male and female screw structure 13 so that the filter element 3 can be replaced.
In order to prevent the internal lubricating oil from leaking out at the time of this replacement, the drain plug 28 is provided so that the lubricating oil can be taken out in advance.

In the unlikely event that the filter element 3 becomes clogged, a relief valve 29 is provided in the upper portion of the hollow portion 4 for preventing the amount of lubricating oil from flowing and adversely affecting the engine.

In the body 11, the lubricating oil that has been filtered from the filter element 3 returns to the engine through the oil outlet passage 16, but when the resistance of the heat exchanger is high when the engine is cold and the lubricating oil does not flow easily, the lubricating oil A relief valve 30 is provided to bypass the valve.

[0028]

Second Embodiment (FIG. 6) Next, an embodiment of the present invention in which a heat exchanger is provided in an air-cooled manner will be described with reference to FIG. Heat exchanger 1b (air cooling type)
A cylindrical gap-shaped oil inlet 6a is formed in the lower part of the cylindrical body 2b, an oil outlet 7a is formed in the upper part, and a plurality of oil pipes 5a arranged on the outer periphery of the inner cylindrical body 2b are connected to the oil inlet 6a and the oil outlet. Provided in communication with 7a,

For example, bolts 21 are attached to the engine block 14.
The lower end of the heat exchanger 1b is fixed to the body 11 which is fixed by fixing means such as fastening, by means of fixing means such as brazing 12a so that the oil inlet 6a communicates with the oil inlet passage 15 of the body 11. Prepare,

Further, the cylindrical filter element 3 is inserted in the central space 2c of the heat exchanger 1b, and
The cover 10 is detachably fixed to the upper end by fixing means such as screwing of the male and female screw structure 13, and the filter element 3 is pressure-bonded and fixed on the body 11 via the spring 22, and the hollow portion 4 and the body 11 are fixed. A cooling and filtering device for engine lubricating oil, which is provided in communication with the oil outlet passage 16,

The lubricating oil O of the engine 23 is replaced by the oil pan 24.
From the oil pump 25 through the oil inlet passage 15 of the body 11 into the heat exchanger 1b through the oil inlet 6a, the oil pipes 5a through the upper oil outlet 7a into the central space 2c, and the filter element 3 through which it is filtered and purified to enter its hollow portion 4, and then returned to the engine 23 through the oil outlet passage 16 of the body 11 for circulation,

On the other hand, the air blown by the engine fan or the vehicle is brought into contact with the oil pipes 5a and the fins 18 of the heat exchanger 1b, the outer peripheral surface of the inner cylindrical body 2b, etc. to exchange heat and cool the lubricating oil. Is a cooling and filtering device for lubricating oil of an engine.

[0033]

Third Embodiment (FIGS. 7 to 15) A fitting edge 37 is extended on the inner and outer circumferential edges of the ring-shaped half pipe portion 36, and a connecting pipe 38 is provided on the top plate of the half pipe portion 36.
A plurality of half-tube plates 35 each having a substantially dish-shaped cross section, in which female short tubes 38a and male short tubes 38b are formed in a concavo-convex pattern at 90 ° intervals (FIGS. 11 and 12).

At the same time as fitting each half pipe portion 36 of each half pipe plate 35 into each fitting edge 37, each female short pipe 38a is fitted with the male short pipe 38b to form a plurality of half pipe plates 35. By stacking, a plurality of ring-shaped flow paths 39 are provided in a stepped manner, and the flow paths 39 at every other steps are connected by the connecting pipe 38,
The oil circulation flow channel 39a and the water circulation flow channel 39b are formed in a state where the respective stages are adjacent to each other, and the heat exchanger 1c is provided.

The connecting pipe 38 or the short pipe on the lower surface of the lowermost flow passage 39 of the heat exchanger 1c is connected to the water inlet 8b and the water outlet 9b.
In addition, 1 is used as the oil inlet 6b of the connecting pipe 38 or the short pipe on the lower surface of the flow passage 39 at the second stage from the bottom, and the connecting pipe 38 or the short pipe on the upper surface of the flow passage 39 at the second stage from the top is formed. 1 is used as the oil outlet 7b, and the lower end of the heat exchanger 1c is fixed to the body 11 fixed to the engine block 14 by fixing means such as brazing 12a.
The oil inlet passage 15 and the oil inlet 6b are communicated with each other, the water inlet passage 31 and the water outlet passage 32 are communicated with the water inlet 8b and the water outlet 9b, and the upper end of the heat exchanger 1c is brazed 12a, for example.
Oil outlet 34 of the upper body 33 fixed by a fixing means such as
And the oil outlet 7b are provided in communication with each other,

A cylindrical filter element 3 is inserted in the central space 2c of the heat exchanger 1c, and
The cover 10 is detachably fixed to the upper end of the upper body 33 by fixing means such as screwing the female and male screw structure 12, and the filter element 3 is attached to the body 1 via the spring 22.
1. A cooling / filtering device for engine lubricating oil, which is pressure-bonded and fixed on 1 and in which the hollow portion 4 and the oil outlet passage 16 of the body 11 are provided in communication with each other,

The lubricating oil O of the engine 23 is replaced by the oil pan 24.
From the oil pump 25 through the oil inlet passage 15 of the body 11 through the oil inlet 6b into the oil circulation passage 39a of the heat exchanger 1c and the adjacent cooling water circulation passage 39a.
is cooled in b, enters the central space 2c from the oil outlet 7b,
After passing through the filter element 3 to be filtered and purified, the oil is returned from the oil outlet passage 16 of the body 11 to the engine 23 for circulation,

The water W pumped by the water pump 26 is cooled by the radiator 27, passes through the water inlet passage 31 and enters the water circulation passage 39b of the heat exchanger 1c from the water inlet 8b to the respective passages 39. Is a cooling and filtering device for lubricating oil of an engine, which is provided to cool the lubricating oil O by circulating it through the water outlet 9b to the water outlet passage 32.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of a first embodiment (a heat exchanger 1a is provided in a water-cooled type) of a device of the present invention.

FIG. 2 is a vertical sectional front view of the heat exchanger.

FIG. 3 is a partially cutaway plan view of FIG.

FIG. 4 is a vertical sectional front view of the cover.

FIG. 5 is a vertical sectional front view of a body fixed to an engine block.

FIG. 6 is a vertical cross-sectional front view of a second embodiment of the device of the present invention (the heat exchanger 1b is provided in an air-cooled manner).

FIG. 7 is a vertical cross-sectional front view of the third embodiment of the device of the present invention (the heat exchanger 1c is provided in a stacking ring-like water-cooling type) and is a diagram showing an oil circulation path.

FIG. 8 is a vertical cross-sectional front view of a third embodiment of the device of the present invention (where the heat exchanger 1c is provided in a stacking ring-shaped water-cooled type) and shows a circulation path of cooling water.

FIG. 9 is an enlarged cross-sectional view of the heat exchanger 1c portion of FIGS. 8 and 9, and is an explanatory view showing each circulation passage of oil and water connected by a connecting pipe at every other stage.

FIG. 10 is an enlarged cross-sectional view of the heat exchanger 1c portion of FIGS. 8 and 9, and is an explanatory view showing respective circulation passages of oil and water that are stacked and adjacent to each other and exchange heat.

FIG. 11 is a plan view of a half-tube plate that constitutes the stacking ring heat exchanger.

12 (a) is an enlarged sectional view taken along the line DD of FIG. 11, FIG. 12 (b) is an enlarged sectional view taken along the line EE of FIG.
Is an enlarged sectional view taken along line FF.

FIG. 13 is a plan view showing a schematic configuration of a stacking ring heat exchanger.

14 is an enlarged cross-sectional view taken along the line GG of FIG.

15 is an enlarged cross-sectional view taken along line HH of FIG.

FIG. 16 is a vertical sectional front view of a conventional cooling / filtering device for lubricating oil of an engine.

[Explanation of symbols]

 O Lubricating oil W Water (water cooling type) A Air (cooling air) 1a Heat exchanger (water cooling type) 1b Heat exchanger (air cooling type) 1c Heat exchanger (water cooling type, stacking ring shape) 2a Outer cylindrical body 2b Cylindrical body 2c Central space 3 Filter element 4 Hollow part 5 Water pipe (water cooling type) 5a Oil pipe (air cooling type) 6 Oil inlet (water cooling type) 6a Oil inlet (air cooling type) 6b Oil inlet (water cooling type, stacking ring type) 7 Oil outlet (water cooling type) 7a Oil outlet (air cooling type) 7b Oil outlet (water cooling type, stacking ring shape) 8 Water inlet 9 Water outlet 10 Cover 11 Body 12 Fixing means by screwing male and female threads 12a Fixing by brazing Means 13 Fixing means by screwing male and female screw structure 14 Engine block 15 Oil inlet passage 16 Oil outlet passage 17 Spring 18 Fin 19 Gasket packing 20 Gasket packing 2 Fixing means by tightening bolts 22 Small hole 23 Engine 24 Oil pan 25 Oil pump 26 Water pump 27 Radiator 28 Drain plug 29 Relief valve 30 Relief valve 31 Water inlet passage 32 Water outlet passage 33 Upper body 34 Oil outlet 35 Half pipe plate 36 Half pipe part 37 Fitting edge 38 Connection pipe 38a Female short pipe 38b Male short pipe 39 Flow path 39a Oil (lubricating oil, high-frequency fluid) circulation flow channel 39b Water (cooling water, low-frequency fluid) circulation flow channel (hereinafter conventional) Reference numeral 100) Heat exchanger 101 Oil filter 102 Engine 103 Oil pan 104 Body 105 Engine block 106 Center bolt 106a Lower screw 106b Collar portion 106c Hollow portion 107 Gasket packing 108 Gasket packing 109 Oil inlet passage 110 Inlet portion 111 Oil outlet passage 112 Water inlet 113 Water outlet 114 Reinforcing member

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location F28D 9/00 F28F 3/08 301Z F28F 3/08 301 B01D 29/06 510Z

Claims (7)

[Claims] 1. A water-cooled or air-cooled heat exchanger for cooling the engine lubricating oil is provided in a ring shape, and the lubricating oil cooled by the heat exchanger is provided in a central space formed by the ring-shaped heat exchanger. Insert a cylindrical filter element for filtering, and fix the cover and body to the upper and lower ends of the heat exchanger incorporating this filter element with fixing means,
A cooling and filtering device for engine lubricating oil, comprising a heat exchanger and a filter element integrated with each other, and a body attached to an engine block. 2. A heat exchanger 1a, wherein a plurality of water pipes 5 are arranged in the space between the inner and outer cylindrical bodies, an oil inlet 6 having a circumferential gap is formed in the lower part of the inner cylindrical body, and an oil outlet 7 is formed in the upper part. Then, a water inlet 8 is formed in the upper part of the outer cylindrical body, a water outlet 9 is formed in the lower part, and it is provided in communication with each of the water pipes 5, and the lower end of the heat exchanger 1a is fixed to the engine block 14 by a fixing means. The body 11 is fixed to the body 11 by means of a fixing means so that the oil inlet 6 communicates with the oil inlet passage 15 of the body 11, and the cylindrical filter element 3 is inserted into the central space 2c of the heat exchanger 1a and the upper end The cover 10 is fixed to the body 11 by a fixing means, the filter element 3 is pressure-bonded and fixed on the body 11 via a spring 22, and the hollow portion 4 and the oil outlet passage 16 of the body 11 are provided in communication with each other. Engine lubricating oil cooling filtration equipment. 3. A heat exchanger 1b comprising a cylindrical body 2b having a circumferentially spaced oil inlet 6a and an upper oil outlet 7a, and a plurality of oil pipes arranged on the outer periphery of the inner cylindrical body 2b. 5a
Is provided so as to communicate with the oil inlet 6a and the oil outlet 7a, and the lower end of the heat exchanger 1b is fixed to the body 11 fixed to the engine block 14 by fixing means so that the oil inlet 6a and the body 11 are connected to each other. An oil inlet passage 15 is provided so as to communicate with each other, a cylindrical filter element 3 is inserted in the central space 2c of the heat exchanger 1b, and a cover 10 is fixed to the upper end by a fixing means. And crimp the filter element 3 onto the body 11,
The cooling / filtering device for lubricating oil of an engine according to claim 1, wherein the hollow portion 4 and the oil outlet passage 16 of the body 11 are provided in communication with each other. 4. A ring-shaped semi-tubular portion is provided with fitting edges extending along the inner and outer circumferential edges, and female short pipes and male short pipes for connecting pipes are formed on the top plate of the semi-piped portion every 90 degrees. Providing multiple half-tube plates with a dish-shaped cross section, fitting each half-tube part of each half-tube plate to each mating edge, and at the same time fitting each male short tube to each female short tube, By stacking the half-pipe plates, a plurality of ring-shaped flow passages are provided in stages, and every other flow passage is connected by a connecting pipe to form an oil circulation passage and a water circulation passage. The stages are formed adjacent to each other to provide the heat exchanger 1c, and the connecting pipes or short pipes on the lower surface of the lowermost flow passage of the heat exchanger 1c are used as the water inlet 8b and the water outlet 9b. The connection pipe or the short pipe 1 on the lower surface of the flow passage in the second from the bottom is the oil inlet 6b, and the connection pipe or the short pipe 1 on the upper surface of the flow passage in the second from the top is the oil outlet 7b. Te, and fixed with fixing means to the engine block 14 Body 1
1, the lower end of the heat exchanger 1c is fixed by fixing means,
The oil inlet passage 15 of the body 11 communicates with the oil inlet 6b, and the water inlet passage 31, the water outlet passage 32, and the water inlet 8 are connected.
b and the water outlet 9b, and the oil outlet 34 and the oil outlet 7b of the upper body 33 fixed to the upper end of the heat exchanger 1c by fixing means.
And a cylindrical filter element 3 is inserted into the central space 2c of the heat exchanger 1c and the upper body 3
The cover 10 is fixed to the upper end of 3 by fixing means, the filter element 3 is pressure-bonded and fixed on the body 11 via the spring 22, and the hollow portion 4 and the oil outlet passage 16 of the body 11 are provided in communication with each other. The engine cooling and filtering device for lubricating oil according to claim 1. 5. The fixing means is a threaded joint having a male and female screw structure, a screw,
The cooling / filtering device for lubricating oil of an engine according to claim 1, which is a fastening means such as a bolt, brazing with a brazing material such as hard brazing, adhesion with an adhesive, or other well-known fixing means. 6. A stack of ring-shaped pipes or half-pipe plates, a plurality of ring-shaped flow passages are provided in a plurality of stages, and a portion of every other flow passage is connected by a connecting pipe. Then, a high temperature fluid circulation channel and a low temperature fluid circulation channel are formed adjacent to each other at each stage, and each circulation channel is equipped with a fluid inlet and a fluid outlet. A stacking ring heat exchanger, characterized in that heat is exchanged between fluids by heat conduction between adjacent flow paths in the process of circulating fluids having different temperatures in the paths. 7. A ring-shaped semi-tubular portion is provided with fitting edges extending along the inner and outer circumferential edges thereof, and female short pipes and male short pipes for connecting pipes are formed on the top plate of the semi-piped portion at every 90 degrees. Providing a plurality of half-tube plates with a dish-shaped cross section, fitting each half-tube part of each half-tube plate to each fitting edge, and at the same time fitting a male short tube to each female short tube, By forming a stack of half-pipe plates, a plurality of ring-shaped flow passages are provided in a stepped manner, and every other flow passage is connected by a connecting pipe, and a high temperature fluid circulation passage and a low temperature fluid circulation passage are provided. 7. The stacked ring heat exchanger according to claim 6, wherein each stage is formed adjacent to each other, and the connection pipe opened at the uppermost stage or the lowermost stage is used as a fluid inlet or a fluid outlet.