JPS59131753A - Hot gas engine - Google Patents

Abstract

PURPOSE:To make the engine with a low cost structure suitable for a training aid by a method wherein a heater, a cooler, a regenerator and cylinders are arranged in compact and the heater is formed integrally by brazing it in a furnace or the like in order to improve the heat transfer effect thereof. CONSTITUTION:The high-temperature expansion cylinder 35 and the regenerator 35 are arranged in parallel between the heater 102 and the cooler, the low-temperature compression cylinder is arranged coaxially with the high-temperature expansion cylinder 35 above the cooler and the opening of the regenerator 37 is communicated with the insides of the high-temperature expansion cylinder 35 and the low-temperature compression cylinder through the heater 102 and the cooler. The heater 102 is constituted by a partitioning plate 49, wound in spiral with a small clearance, and two sheets of plate members 1, 2 while the plate members 1, 2 and the partitioning plate 49 are formed integrally under pinching the partitioning plate 49 between the plate members by the method of brazing them in the furnace or the like. A recess 50 is provided on the plate member 1 at the side of heating.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a hot gas engine suitable for teaching materials, and its purpose is to provide a heater, a cooler, and a regenerator, which are the main components of the hot gas engine. In addition to arranging the cylinder compactly, the heater is integrally formed by a method such as brazing in a furnace, thereby improving the heat transfer effect and making it possible to manufacture it at low cost.

Heat gas engines such as the already known Stirling engine repeatedly expand and compress the working gas by heating and cooling the working gas such as air, hydrogen, helium, etc. sealed in a closed space. It is an external combustion engine that is designed to generate power, and has been actively researched in recent years due to its high thermal efficiency and low noise. There is a need for a small-output hot gas engine for teaching materials that can operate efficiently and well even with heating sources.

For this purpose, instead of using expensive materials such as hydrogen or helium, it is easier and safer to use atmospheric pressure air as the working gas. On the other hand, in hot gas engines that use gases such as hydrogen and helium, it is necessary to increase the internal pressure of the working gas in order to increase the output, and this requires a complex and high-performance seal structure. It is known that hot gas engines for teaching materials that use small-output air can operate effectively with atmospheric pressure as the average pressure if the leakage of the working gas (air) is kept to a minimum.

In view of the above points, the present invention uses air as the working gas and configures the working gas space so that the working gas can effectively reciprocate, thereby obtaining a hot gas engine with low output but high efficiency. It is.

The present invention will be described in detail below using drawings including conventional examples. FIG. 1 is a front view showing the structure of a conventional hot gas engine, FIG. 2 is a similar plan view, and FIG. 6 is a similar right side view. 4 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 5 is a sectional view taken along line 13-E in FIG.
A line sectional view, FIG. 6 is a main sectional view showing another conventional heater, FIG. 7 is a main sectional view showing a heater in an embodiment of the present invention, and FIG. 8 is a plane showing a partition plate in the same. It is a diagram.

Note that since the present invention and the conventional example include common configurations, the description will be made with reference to drawings other than FIGS. 7 and 8.

Mainly referring to FIG. 6 and FIG. 4, 102 indicates two plates 1.
, 2 are polymerized via a sealing member 8, and 506 is a cooler similar to the heater 102, in which the bottom plate of the cooling cylinder 6 and the plate material 5 are overlapped via an O-ring 64. It was formed by Heater 102 and cooler 506
An annular groove 66 and a filter 8 are cut into the working gas heat transfer side wall of '. The heater 102 and the cooler 506 face each other with a gap between them, and the high temperature expansion cylinder filter and the regenerator 4 are arranged in parallel between them. By the way, the portions of the high-temperature expansion cylinder 6 that contact the heater 102 and the cooler 506 are sealed with seal members 9 and 40, and similarly, the end face of the regenerator 4 is also sealed with seal members 10 and 41. Therefore, air (hereinafter referred to as working gas in the configuration description) will not leak from the high temperature expansion cylinder 3 and the regenerator 4. The regenerator 4 has both openings connected to the grooves 6. of the heater 102 and the cooler 506. High temperature expansion cylinder 6 through filter 8
It communicates with the inside of the low-temperature compression cylinder 7, and the inside is filled with a large number of fine mesh wire meshes (not shown).

The cooling cylinder 6 of the cooler 506 described above forms a cooling water tank 44, on the bottom of which a low temperature compression cylinder 7 is arranged coaxially with the high temperature expansion cylinder 6 via a seal member 46.

Now, next in the power transmission mechanism, the low temperature compression cylinder 7
Arm support 11 and crank support 12 are on the top of the
is provided. Further, one end of the displacer piston arm 20 and the power piston arm 26 are each supported by a connecting pin 22.31 on the arm support 11,
A crankshaft 42.42 of the crank 14 is rotatably fixed to the crank supports 12, 12, and a flywheel i5. is is fixed.

Now, inside the high temperature expansion cylinder 6 and the low temperature compression cylinder 7, there is a displacer piston 15 and a power piston 16.
are arranged, both pistons 15° 16 are connected to both cylinders 3,
It is possible to perform a reciprocating motion within 7 with a certain phase difference (for example, 900). Further, the displacer guide 17 integrally formed on the upper part of the displacer piston 15 is hollow and reciprocates within the piston body 62 of the power piston 16. The movement of the displacer guide 17 is the same as the movement of the connecting plate 18, which will be described later.

Referring also to FIG. 5, each piston 15.16 is fixed to one end of a connecting plate 18.19, and the other end of each connecting plate 18.19 is connected to a displacer piston arm 20 and It is connected to power piston arm 2. Therefore, due to the reciprocating motion of the dispersor piston 15 and the power piston 16, both piston arms 20.23 swing.

Meanwhile, the other ends of the displacer piston arm 20 and the power piston arm 23 are connected to a connecting rod 24.25 via a connecting hinge 26.60, and the connecting rod 24.25
The other ends are connected to the crank pin 28 of the crank 14 via bearings 29, 29, respectively. For this reason, the crank wheels 45, 46, 4 with the crank pin 28 fixed
7.48 rotates, and the flywheel 1'3.13 similarly rotates via a crankshaft 42.42 fixed to a crank wheel 45.48.

The operation of the conventional example having the above configuration will be explained below.

First, cooling water is poured into the cooling water tank 44 of the cooler 506, and when the bottom of the heater 102 is heated with a suitable combustion device, such as a gas burner 66, the high temperature expansion cylinder 6 and the heater 102 are heated.
, regenerator 4, cooler 5o6° The working gas sealed in the internal space of the low-temperature compression cylinder 7 is heated on the heater 102 side and cooled on the cooler 50.15 side. At this time, when the flywheel 13.degree. 13 is manually rotated, the connecting rod 24.25 connected to the crank pin 28 of the crank 14 is actuated, thereby causing the displacer piston to be connected by each connecting pin 26.50. The arm 20 and the power piston arm 26 swing. As a result, the connecting plates 18.19 connected to the arms 20.23 by the connecting pins 21.27 move up and down, applying a starting force, and finally displacer piston 15 and power piston 16.
continues a reciprocating motion that is not synchronized with periodic changes in temperature and pressure. This is because after startup, the displacer piston arm 20 and the power piston arm 26 swing with a certain phase difference (for example, 90 degrees).
Since the displacer piston 15 and the power piston 16 connected to the connecting plates 18 and 19 reciprocate within the high-temperature expansion cylinder 6 and the low-temperature compression cylinder 7 with the above-mentioned phase difference, the working gas sealed in the internal space is released. This is because it moves between the heater side and the cooler side.

In other words, after startup, the sealed working gas flows into the heating space 65.
, the working gas passage consisting of the groove 66 of the heater 102, the space 67 of the regenerator 4, the groove 38 of the cooler 506, and the cooling space 69, and the temperature and pressure of the working gas change periodically. The reciprocating motion continues.

The operating principle of the power piston 16 described above is exactly the same as that of a normal Stirling engine.

Of course, the continuation of the reciprocating movement of the Fm power piston 16 and the displacer piston 15 causes the arm 23.20 to swing through the connecting plate 19.18, and the crank wheel 45.20 through the connecting rod 25.24. '46°47.48 and the flywheel 13.13 continue to rotate.

Now, here, the theoretical thermal efficiency η of this engine is expressed as O 2 where the temperature of the heater is TH1 and the temperature of the cooler is TC.

Therefore, in order to increase the efficiency η, ■ If the cooler temperature TC is constant, the heater temperature T
H is raised as much as possible and the temperature difference between the two is widened. ■ If the temperatures TH and To are constant, the temperature difference ΔTH- between the working gas inside the engine and the working gas heat transfer side wall 102a of the heater 102 is It is necessary to make it extremely small,
For example, when the heating heat source has a small capacity, such as in the case of a hot air engine for teaching materials, it is necessary to make the heat transfer area of the heater for the working gas as large as possible and to have a structure with good heating efficiency. It becomes an important element.

However, as shown in FIG. 4, in the conventional example, the heater 102
Since the working gas heat transfer side wall 102a has an annular groove 6, if the temperature TH of the heater is constant, the working gas is not sufficiently heat-transferred and flows from the regenerator space filter 7 to the heating space. Passed to 65. Therefore, in this case, ΔTH is large and heating efficiency is poor.

Therefore, in order to improve this, as shown in Fig. 6,
A large number of grooves 36 are cut into the heating wall 102b on the gas burner side of the heater 102 and the working gas heat transfer side wall 102a on the opposite side, thereby increasing the heat transfer area. According to this structure, even in a hot gas engine for teaching materials that uses a small-capacity heating source such as a gas burner or an alcohol rung, the heat transfer efficiency to the working gas is good, so it is possible to provide a highly efficient engine with a large output. can.

However, in this conventional example, a large number of grooves 66 are cut into the working gas heat transfer side wall 102a of the heater 102, so the processing cost is relatively high when manufacturing by cutting, and the grooves are not required when manufacturing by molding. The drawback was that the width could not be made smaller.

Therefore, in the present invention, as shown in FIG. 7 and FIG.
The plate material 1 on the heating wall side 102b of 02 is press-drawn and has a concave portion 50 with a diameter of φD1 in the center, and an inner diameter of φD2 around the periphery.
Seven ring portions 51 are provided.

49 has an inner diameter φD + and an outer diameter φD2 as shown in Fig. 8.
It is wound with a spiral-shaped partition plate with uniform fine gaps δ. The plate material 2 above the heater 102 is a circular plate with an outer diameter of D2, and has holes with the same diameter as the heating space 65 and the regenerator space 37.

Then, the partition plate 49 is positioned and arranged in a space enclosed by the diameters lD1 and φD2 of the plate material 1, and the plate material 2 is press-fitted and fixed onto the flange portion 51 of the plate material 1 having an inner diameter φD2, and the partition plate 49 and the plate material 1 , 2 are all polymerized into a single body by furnace brazing.

Therefore, according to the present invention, it is possible to easily eliminate the high cost of the conventional cutting sump and the wide gap between the sumps used in molds.
The effect is very strong.

In addition, the spiral-shaped partition plate 49 can easily reduce the gap δ. For example, if two sheets of plate material with a thickness of 1 dia are stacked and molded, two partition plates of δ-'Irun can be obtained, which is extremely economical. It is true.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the structure of a conventional hot gas engine, Fig. 2 is a similar plan view, Fig. 6 is a similar right side view, Fig. 4 is a sectional view taken along line A-A in Fig. 1, Fig. 5 is a sectional view taken along the line B-B in Fig. 1, Fig. 6 is a main sectional view showing another conventional heater, and Fig. 7 is a sectional view taken along the line B-B in Fig. 1.
The figure is a main sectional view showing a heater in one embodiment of the present invention, and FIG. 8 is a plan view showing a partition plate in the same. 1... Plate material 2... Plate material 6... High temperature expansion cylinder 4... Regenerator 5... Plate material 6... Water tank 7... Low temperature compression cylinder 8... Seal member 9
...Seal member 10...Seal member 11...Arm support 12...Crank support 13...
・Flywheel 14・Crank 15・・Displacer piston 16・・Power piston 17・・Displacer guide 18・・Connecting plate 1
9... Connecting plate 20... Displacer piston arm 21... Connecting bin 22... Connecting bin 23...
...Power piston arm 24...Connecting rod 25.
...Connecting rod 26...Connection bin 27...Connection bin 28...Crank bin 29...Bearing 3
0...Connection bin 61...Connection bin 62...Piston body 66...Gas burner 64...0 ring groove 5...Heating space 66...Heater groove 67...
・Regenerator space 38・・Cooler groove 69・・Cooling space 40・・Seal member 41・・Seal member 42・
・Crankshaft 46...Seal member 44...Cooling water tank 45...Crank wheel 46・Crank wheel 47・
...Crank wheel 4El・Crank wheel 102...Heater 102a...Working gas heat transfer side wall 102b...Heating wall 506...Cooler 506a...Working gas heat transfer side wall 506b/Cooling wall 49...Partition Plate 50... Recessed portion 51... Flange portion Patent applicant Figure 6 Figure 6 Figure 7

Claims (2)

[Claims] (1) A heater and a cooler are arranged to face each other with a gap therebetween, and a high-temperature expansion cylinder and a regenerator are arranged in parallel between the heater and the cooler, while the high-temperature expansion cylinder is placed above the cooler. A hot gas engine in which a cold compression cylinder is disposed coaxially with the regenerator, and both openings of the regenerator are communicated with the inside of the hot expansion cylinder and the cold compression cylinder through the heater and the cooler, respectively, to serve as working gas passages. The heater consists of a spiral-shaped partition plate wound with a slight gap and two plates, and the two plates are sandwiched between the partition plates and brazed in a furnace according to the law. A hot gas engine characterized in that it is integrally formed by polymerization. (2) The hot gas engine according to claim 1, wherein the plate material on the heating side of the heater has a recess.