JPH05280815A - Heat exchanger for external combustion engine - Google Patents

Abstract

PURPOSE:To distribute heat exchange medium evenly to passageways formed on the outer side and shorten the axial length of a cylinder by forming as outer side grooves annular grooves and holes through which the annular grooves communicate with each other, both the annular grooves and holes as passageways for medium. CONSTITUTION:A multiplicity of straight-line grooves 26a are formed axially in the inner circular side of a sleeve 26. A multiplicity of annular grooves 26b are also formed in the outer circular side of the sleeve 26. The annular grooves 26b formed on the side of the inflow communicate with each other by a hole 26c and those formed on the side of the outflow communicate with each other via a hole 26d. In the side opposite to these holes 26c, 26d a hole 26e extending against both the two holes is formed whereby all of the annular grooves 26b communicate with each other. The space formed between the annular grooves 26b and the inner circular wall of an outer case 25 functions as a passageway 29 for heat exchange medium that undergoes heat exchange with a working gas. This structure makes it possible to distribute heat exchange medium evenly to the outer side passageway and shorten the axial length of the cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for an external combustion engine such as a Stirling engine and a Brumeier cycle heat pump.

[0002]

2. Description of the Related Art Conventionally, as this type of external combustion engine, as disclosed in, for example, Japanese Patent Publication No. 62-56419, a cylinder is provided with a large number of fins, and a piston is guided to the inner wall side of the fin. In some cases, a sleeve is mounted and a heat insulating case is mounted on the outer wall side of the sleeve to form a passage for a heat exchange medium such as working gas and cooling water.

[0003]

However, in this case, since the inlet / outlet of the outer passage (passage of the heat exchange medium) is annularly arranged at both ends in the axial direction of the cylinder, the heat exchange medium is evenly distributed in the outer passage. Not only is it difficult to divert, but it is necessary to provide headers at the entrances and exits at both ends in the axial direction.
Inevitably, the dimension in the axial direction becomes long.

In view of the above-mentioned circumstances, the present invention provides a heat exchanger for an external combustion engine capable of uniformly distributing the heat exchange medium to the outer passage and shortening the axial dimension of the cylinder. The purpose is to provide.

[0005]

That is, according to the present invention, a cylinder (10, 11) in which a working gas is sealed, and a sleeve (26) sandwiched between the cylinder and an outer case (25).
A plurality of grooves (26a) are formed on the inner peripheral surface of the sleeve, and a space surrounded by the grooves and the outer peripheral wall of the cylinder is supplied with the working gas. A plurality of annular grooves (26b) are formed on the outer peripheral surface of the sleeve as the passages (28), and the annular grooves located on the inflow side and the annular grooves located on the outflow side of these annular grooves communicate with each other. Both side communication ports (26c) for communicating the inflow side communication port (26c) and the outflow side communication port (26d) with the annular groove located on the inflow side and the annular groove located on the outflow side.
e) to form a space surrounded by the annular groove and the inner peripheral wall of the outer case as a medium passage (29) for a heat exchange medium for exchanging heat with the working gas, and the medium passage is provided in the outer case. Inlet of the heat exchange medium (25
g) and a heat exchange medium outlet (25f) communicating with the outflow side of the medium passage in the outer case.

Further, as the sleeve (26), a plurality of annular plates (31, 32) having different outer diameters and having irregularities (31a, 32a) formed on the inner peripheral surface thereof are laminated, and these irregularities are formed as a whole. A plurality of grooves (26a) are formed on the inner peripheral surface, and a plurality of annular grooves (26b) having an inflow side communication port (26c), an outflow side communication port (26d) and both side communication ports (26e) are formed on the outer peripheral surface. It is configured by using the formed laminated body.

Further, according to the present invention, the external combustion engine (6) is provided with a cylinder (10, 11) in which a working gas is sealed and a sleeve (26) sandwiched between the cylinder and the outer case (25). The plurality of grooves (10c, 11c) are formed on the outer peripheral wall of the cylinder, and the space surrounded by the grooves and the inner peripheral surface of the sleeve serves as a gas passage (28) for the working gas. A plurality of annular grooves (26b) are formed on the outer peripheral surface of the inflow side communication port (26c) for communicating between the annular grooves located on the inflow side and the annular grooves located on the outflow side of these annular grooves, and The outflow side communication port (26d) and the both side communication ports (26e) for communicating the inflow side annular groove and the outflow side annular groove are formed, and the annular groove and the inner peripheral wall of the outer case are formed. The space surrounded by and A medium passage (29) for the heat exchange medium that exchanges heat with the dynamic gas is provided, and an inlet (25 g) for the heat exchange medium that communicates with the inflow side of the medium passage is provided in the outer case, and the medium passage is provided in the outer case. A heat exchange medium outlet (25f) communicating with the outflow side is provided.

The numbers in parentheses are for convenience of representing corresponding elements in the drawings, and the present invention is not limited to the description in the drawings. This also applies to the "action" column.

[0009]

According to the present invention, the outer groove (heat exchange medium side) is the annular groove (26b), and the communication ports (26c, 26d, 26e) for communicating these annular grooves are formed.
This acts as a medium passage (29).

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing an embodiment of an external combustion engine according to the present invention, and FIG. 2 is an assembly drawing showing an example of a medium-temperature or low-temperature heat exchanger constituting the external combustion engine shown in FIG. 3 is shown in FIG.
FIG. 4 is a vertical cross-sectional view of the heat exchanger shown in FIG. 4, FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3, and FIG. 5 is another example of the medium-temperature or low-temperature heat exchanger that constitutes the external combustion engine shown in FIG. The assembly drawing shown in FIG.
FIG. 8 is an assembly diagram showing still another example of the intermediate-temperature or low-temperature heat exchanger that constitutes the external combustion engine shown in FIG.

In the external combustion engine 6 according to the present invention, as shown in FIG. 1, a high temperature side cylinder 10 and a low temperature side cylinder 11 are arranged so as to be orthogonal to the crankshaft 8. A piston 1a is slidably fitted in the high temperature side cylinder 10, and the space in the high temperature side cylinder 10 is a piston 1a.
It is divided into a high temperature chamber 10a and a medium greenhouse 10b. Similarly, a piston 1b is slidably fitted in the low temperature side cylinder 11, and the space in the low temperature side cylinder 11 is formed by the piston 1b in the low temperature chamber 11a and the inside greenhouse 11b.
It is divided into and. Rods 7a and 7b are fixed to these pistons 1a and 1b, respectively.
The a and 7b are respectively connected to crank mechanisms 9a and 9b driven by the rotation of the crankshaft 8.

As shown in FIG. 1, the high temperature side cylinder 10 is provided with a high temperature heat exchanger 12 in communication with the high temperature chamber 10a. A high temperature regenerative heat exchanger 13 and a medium temperature heat exchanger 14 are provided along the outer periphery of the high temperature side cylinder 10. On the other hand, a low temperature heat exchanger 15 is provided on the outer periphery of the low temperature side cylinder 11 so as to communicate with the low temperature chamber 11a. The low temperature heat exchanger 15 is provided with a low temperature regenerative heat exchanger 16 for medium temperature. A heat exchanger 17 is provided. The medium temperature heat exchanger 17 and the medium temperature heat exchanger 14 are communicated with each other by a communication duct 18, and are communicated with the middle greenhouse 10b of the high temperature side cylinder 10 and the middle greenhouse 11b of the low temperature side cylinder 11. ..

An indoor heat exchanger 20 is installed in the room. The indoor heat exchanger 20 has one end connected to the intermediate temperature heat exchanger 14 and the other end connected to the intermediate temperature heat exchanger. A closed cycle is formed by returning to the intermediate temperature heat exchanger 14 via the vessel 17. In addition, the outdoor heat exchanger 2 is installed outdoors.
1 is installed, and the outdoor heat exchanger 21 is connected to the low temperature heat exchanger 15. Furthermore, the high temperature side cylinder 10
A heater 22 is installed above FIG.

By the way, the intermediate temperature heat exchangers 14 and 17 are provided.
As shown in FIG. 2, the heat exchanger 15 for low temperature and the heat exchanger 15 for low temperature are each made of a stainless steel outer case 2 formed in a substantially cylindrical shape.
5 and a sleeve 26 fitted and engaged with the outer case 25. The sleeve 26 is made of aluminum and is integrally molded into a substantially cylindrical shape and has good heat conductivity. Exterior case 2
5 has a tubular body 25a, and flanges 25b and 25c are formed at the upper and lower ends of the tubular body 25a in FIG. The flange 25b has a plurality of mounting bolt holes 25d.
Is formed in an annular shape, and a plurality of mounting bolt holes 25e is formed in the flange 25c in an annular shape. Further, as shown in FIGS. 2 and 3, the flange 25b
Is provided with an outlet 25f for the heat exchange medium, and the flange 25c is provided with an inlet 25g for the heat exchange medium.

On the other hand, on the inner peripheral surface of the sleeve 26 (that is, on the high temperature side cylinder 10 side or the low temperature side cylinder 11 side), FIG.
As shown in FIG.
A substantially cylindrical space formed in the axial direction of 6 and surrounded by the groove 26a and the outer peripheral wall of the high temperature side cylinder 10 or the low temperature side cylinder 11 serves as a gas passage 28 for the working gas. Further, the outer peripheral surface of the sleeve 26 has a large number of annular grooves 26.
b is formed, and the inflow side of these annular grooves 26b (the heat exchange medium inlet 25g side of the outer case 25).
The annular grooves 26b located at 1 are communicated with each other through the inflow side communication port 26c, and the annular grooves 26b located at the outflow side (on the side of the heat exchange medium outlet 25f of the exterior case 25) are connected to the outflow side communication port 26d. Through the. Further, as shown in FIG. 4, all the annular grooves 26b (that is, the annular grooves 26b located on the inflow side and the outflow side) communicate with the opposite side of the inflow side communication port 26c and the outflow side communication port 26d. Both side communication ports 26e are formed, and these annular grooves 26b are formed.
A substantially cylindrical space surrounded by the inner peripheral wall of the outer case 25 serves as a medium passage 29 for a heat exchange medium that exchanges heat with the working gas.

The sleeve 26 and the outer case 25 can be assembled by, for example, brazing or using an O-ring.

Since the external combustion engine 6 according to the present invention has the above-mentioned structure, when the pistons 1a and 1b reciprocate in the high temperature side cylinder 10 and the low temperature side cylinder 11, respectively, a working gas such as helium is generated. The multiple grooves 26a formed on the inner peripheral surface of the sleeve 26 and the high temperature side cylinder 10
Alternatively, the heat exchange medium such as cooling water that reciprocates in the gas passage 28 surrounded by the outer peripheral wall of the low temperature side cylinder 11 and exchanges heat with the working gas is, as shown by an arrow in FIG. A large number of annular grooves 26b formed on the surface and the outer case 2
5 flows through the medium passage 29 surrounded by the inner peripheral wall of the medium 5. That is,
The heat exchange medium is the heat exchange medium inlet 25 of the outer case 25.
From g, the gas flows into the medium passage 29, flows through the inflow-side communication ports 26c, flows through the annular grooves 26b located on the inflow side, wraps around to the back side of the sleeve 26, passes through the both-side communication ports 26e, and is positioned on the outflow side. It flows into each annular groove 26b, wraps around the front side of the sleeve 26 through each annular groove 26b, merges through the outlet side communication port 26d, and flows out from the heat exchange medium outlet 25f of the outer case 25. In addition, the inlet side communication port 2
By changing the arrangement of the 6c, the outlet side communication port 26d, and the both side communication ports 26e, it is possible to easily change or adjust the circulation method of the heat exchange medium.

In the above embodiment, the case where the groove 26a is formed on the inner peripheral surface of the sleeve 26 as shown in FIG. 2 has been described, but as shown in FIG. A large number of linear grooves 10c (11c) are formed on the outer peripheral wall of the side cylinder 11 in the axial direction of the high temperature side cylinder 10 (low temperature side cylinder 11), and these grooves 1
A substantially cylindrical space surrounded by 0c (11c) and the inner peripheral surface of the sleeve 26 may be used as the gas passage 28 for the working gas.

In the above embodiment, the case where the integrally molded sleeve 26 is used has been described.
It is also possible to form the sleeve 26 by using a laminated body obtained by laminating a plurality of two kinds of annular plates having different outer diameters and brazing them. That is, as shown in FIG. 6, an annular plate 31 having a large outer diameter having irregularities 31a formed on its inner peripheral surface and an annular plate 32 having a small outer diameter having irregularities 32a formed on its inner peripheral surface are provided one by one. By alternately stacking these irregularities 31a and 32a to form a large number of linear grooves 26a on the inner peripheral surface of the laminated body as a whole,
A large number of annular grooves 26b may be formed on the outer peripheral surface of the laminated body, and the laminated body may be used as the sleeve 26. In this case, it goes without saying that the predetermined annular plate 31 is provided with the inflow side communication port 26c or the outflow side communication port 26d and the both side communication ports 26e. At this time, the gas passage 28 does not necessarily have to be formed in a straight line, and the annular plates 31 and 32 are staggered to be stacked so that the gas passage 2 can be accelerated to promote heat transfer.
8 may be formed in a spiral shape or a wavy shape. Alternatively, the sleeve 26 may be a laminated body (not shown) obtained by stacking a plurality of annular plates 32 having a small outer diameter and alternately laminating and brazing the annular plates 31 having a large outer diameter. The irregularities 31a and 32a of the annular plates 31 and 32 can be processed by, for example, pressing or etching.

[0021]

As described above, according to the present invention,
A cylinder such as a high temperature side cylinder 10 and a low temperature side cylinder 11 in which a working gas is sealed, and this cylinder and the outer case 2.
In the external combustion engine 6 provided with the sleeve 26 sandwiched between 5 and 5, a plurality of grooves 26a are formed on the inner peripheral surface of the sleeve 26, and a space surrounded by the grooves 26a and the outer peripheral wall of the cylinder. As the gas passage 28 for the working gas, a plurality of annular grooves 26b are formed on the outer peripheral surface of the sleeve 26, and the annular groove 26b located on the inflow side of these annular grooves 26b.
b inflow side communication port 26c and outflow side communication port 26 for communicating the annular grooves 26b located on the outflow side, respectively.
d and a both-side communication port 26e for communicating the annular groove 26b located on the inflow side and the annular groove 26b located on the outflow side are formed, and are surrounded by the annular groove 26b and the inner peripheral wall of the outer case 25. The space is used as a medium passage 29 for a heat exchange medium for exchanging heat with the working gas, and an inlet 25 for a heat exchange medium communicating with the inflow side of the medium passage 29 in the exterior case 25.
Since the outer case (25) is provided with the heat exchange medium outlet (25f) communicating with the outflow side of the medium passage (29), the outer groove (heat exchange medium side) is provided with the annular groove (26).
b, and the communication port 26 for communicating these annular grooves 26b
Since c, 26d, and 26e are formed to serve as the medium passage 29, the split flow is good and heat transfer is promoted. Further, it is not necessary to provide a header or the like near the heat exchange medium entrance / exit, and it is possible to shorten the dimension in the axial direction. Further, since the annular grooves 26b are communicated with each other through the communication ports 26c, 26d and 26e to form the medium passage 29 of the heat exchange medium, the circulation method is changed by changing the arrangement of the communication ports 26c, 26d and 26e. -Adjustment becomes easy.

Further, as the sleeve 26, a plurality of annular plates 31 and 32 having different outer diameters and having irregularities 31a and 32a formed on the inner peripheral surface thereof are laminated to form the irregularities 31a and 3a.
2a forms a plurality of grooves 26a on the inner peripheral surface as a whole, and also has an inflow side communication port 26c and an outflow side communication port 26 on the outer peripheral surface.
If the laminated body is formed by forming a plurality of annular grooves 26b each having d and the both-side communication ports 26e, the heat transfer surface of the working gas side passage becomes rough, so that the flow is disturbed and the transfer is further promoted. Further, by stacking the annular plates 31 and 32 while shifting them, it is possible to easily change the gas passage 28 into a spiral shape or a wavy shape in order to promote heat transfer.

Further, according to the present invention, the external combustion provided with the cylinders such as the high temperature side cylinder 10 and the low temperature side cylinder 11 in which the working gas is sealed, and the sleeve 26 sandwiched between the cylinder and the outer case 25. In the engine 6, a plurality of grooves 10c, 11c are formed on the outer peripheral wall of the cylinder, and a space surrounded by the grooves 10c, 11c and the inner peripheral surface of the sleeve 26 is used as a gas passage 28 for the working gas. A plurality of annular grooves 26b are formed on the outer peripheral surface of the sleeve 26, and the annular groove 26b located on the inflow side of these annular grooves 26b.
b inflow side communication port 26c and outflow side communication port 26 for communicating the annular grooves 26b located on the outflow side, respectively.
d and a both-side communication port 26e for communicating the annular groove 26b located on the inflow side and the annular groove 26b located on the outflow side are formed, and are surrounded by the annular groove 26b and the inner peripheral wall of the outer case 25. The space is used as a medium passage 29 for a heat exchange medium for exchanging heat with the working gas, and an inlet 25 for a heat exchange medium communicating with the inflow side of the medium passage 29 in the exterior case 25.
Since the outer case (25) is provided with the heat exchange medium outlet (25f) communicating with the outflow side of the medium passage (29), the outer groove (heat exchange medium side) is provided with the annular groove (26).
b, and the communication port 26 for communicating these annular grooves 26b
Since c, 26d, and 26e are formed to serve as the medium passage 29, the split flow is good and heat transfer is promoted. Further, it is not necessary to provide a header or the like near the heat exchange medium entrance / exit, and it is possible to shorten the dimension in the axial direction. Further, since the annular grooves 26b are communicated with each other through the communication ports 26c, 26d and 26e to form the medium passage 29 of the heat exchange medium, the circulation method is changed by changing the arrangement of the communication ports 26c, 26d and 26e. -Adjustment becomes easy.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of an external combustion engine according to the present invention.

FIG. 2 is an assembly diagram showing an example of a medium-temperature or low-temperature heat exchanger that constitutes the external combustion engine shown in FIG.

3 is a vertical cross-sectional view of the heat exchanger shown in FIG.

4 is a cross-sectional view taken along the line AA of FIG.

5 is an assembly diagram showing another example of a medium-temperature or low-temperature heat exchanger that constitutes the external combustion engine shown in FIG. 1. FIG.

FIG. 6 is an assembly diagram showing still another example of the intermediate-temperature or low-temperature heat exchanger configuring the external combustion engine shown in FIG. 1.

[Explanation of symbols]

 6 ... External combustion engine 10 ... Cylinder (high temperature side cylinder) 10c ... Groove 11 ... Cylinder (low temperature side cylinder) 11c ... Groove 25 ... Exterior case 25f ... Heat exchange medium outlet 25g ... Heat exchange Medium inlet 26 ... Sleeve 26a ... Groove 26b ... Annular groove 26c ... Inflow side communication port 26d ... Outflow side communication port 26e ... Both side communication port 28 ... Working gas gas passage 29 ... Heat exchange medium Medium passages 31, 32 ... Annular plates 31a, 32a ...

Front page continuation (72) Inventor Keiichi Abe 3-23-5, Ehara-cho, Nakano-ku, Tokyo (72) Inventor Seiichiro Fujimaki 3-1-4-304 Edahigashi, Midori-ku, Yokohama-shi, Kanagawa (72) Inventor Sekikawa Atsushi 1-4-4 Sakuradai, Nerima-ku, Tokyo (72) Inventor Akira Narimiya 1-5-14 Nagaodai, Hirakata-shi, Osaka (72) Inventor Toshihiro Fujino 3-7-43 Fujiidera, Fujiidera-shi, Osaka (72) Invention Yoshiya Oda 2-6-18-203 Shiratori, Atsuta-ku, Nagoya-shi, Aichi Prefecture (72) Inventor Masahisa Otake Osaka Prefecture Moriguchi City 2-18 Keihan Hondori Sanyo Electric Co., Ltd. (72) Inventor Junji Matsue Osaka Prefecture Moriguchi City, 2-18 Keihan Hondori Sanyo Electric Co., Ltd. (72) Inventor Miaki Kurosawa, Moriguchi City, Osaka Prefecture 2-18 Keihan Hondori Sanyo Electric Co., Ltd. (72) Inventor Toshikazu Ishihara Moriguchi City, Osaka Prefecture 2-18, Keihan Hondori Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. An external combustion engine comprising a cylinder filled with a working gas and a sleeve sandwiched between the cylinder and an outer case, wherein a plurality of grooves are formed on an inner peripheral surface of the sleeve, A space surrounded by the groove and the outer peripheral wall of the cylinder is used as a gas passage for the working gas, and a plurality of annular grooves are formed on the outer peripheral surface of the sleeve. And an inflow side communication port and an outflow side communication port for communicating the annular grooves located on the outflow side with each other, and two side communication ports for communicating the annular groove located on the inflow side and the annular groove located on the outflow side. The space surrounded by these annular grooves and the inner peripheral wall of the outer case serves as a medium passage for a heat exchange medium that exchanges heat with the working gas, and the outer case communicates with the inflow side of the medium passage. The entrance of Together, the heat exchanger of the external combustion engine, characterized in that a outlet of the heat exchange medium flowing side and the communicating of the medium passage to the outer case. 2. As a sleeve, a plurality of annular plates having different outer diameters and having irregularities formed on the inner peripheral surface are laminated, and the irregularities form a plurality of grooves on the inner peripheral surface as a whole, and the outer peripheral surface is formed. 2. A heat exchanger for an external combustion engine according to claim 1, wherein a laminated body having a plurality of annular grooves having an inflow side communication port, an outflow side communication port and both side communication ports is used in the heat exchanger. 3. An external combustion engine comprising a cylinder filled with working gas and a sleeve sandwiched between the cylinder and an outer case, wherein a plurality of grooves are formed on an outer peripheral wall of the cylinder, and the grooves are formed. A space surrounded by the inner peripheral surface of the sleeve and the inner peripheral surface of the sleeve is used as a gas passage for the working gas, and a plurality of annular grooves are formed on the outer peripheral surface of the sleeve. And an inflow side communication port and an outflow side communication port for communicating the annular grooves located on the outflow side with each other, and a both-side communication port for communicating the annular groove located on the inflow side with the annular groove located on the outflow side. The space surrounded by these annular grooves and the inner peripheral wall of the outer case serves as a medium passage for a heat exchange medium that exchanges heat with the working gas, and the outer case communicates with the inflow side of the medium passage. The entrance of Together, the heat exchanger of the external combustion engine, characterized in that a outlet of the heat exchange medium flowing side and the communicating of the medium passage to the outer case.