JPS6146449A - Stirling engine - Google Patents

Abstract

PURPOSE:To improve heat exchange efficiency, by coating the periphery of a heat exchanger tube, connected with an expansion cylinder, with a red heat material receiver further filling a space between the red heat material receiver and the heat exchanger tube with a red heat material generating thermal radiation rays. CONSTITUTION:A Stirling engine, having an expansion cylinder 1 and a compression cylinder 5 arranged at an angle being formed around a crankshaft 13, mounts a plurality of heat exchanger tubes 19 appearing in a combustion chamber 17 in the upper of the expansion cylinder 1 and being attached to the peripheral part in a top part of the expansion cylinder 1. The engine connects one of the working fluid passages formed inside each heat exchanger tube 19 with the expansion cylinder 1 and the other with the side of a regenerator 21. Here a red heat material receiver 23 consisting of a ceramic porous plate or the like is mounted to the peripheral wall of a cylinder head 25 so as to cover the periphery of a group of the heat exchanger tubes 19. And the engine, filling a space between the red heat material receiver 23 and the heat exchanger tube 19 with a red heat material 31 of ceramic balls or the like, vertically provides a housing structure 33, charged with a similar red heat material 35, in a central part of the cylinder head 25.

Description

[Detailed description of the invention] [Technical field of invention] This invention relates to a Star Song Engine.

[Technical Background of the Invention] Generally, in a Stirling engine, a heater is connected to an expansion cylinder, a cooler is connected to a compression cylinder, and the heater and cooler are connected by a regenerator. A freely housed expansion piston and a compression screw movably housed in a compression cylinder are connected to a crankshaft. A working fluid such as helium is sealed in a system extending from the expansion cylinder to the compression cylinder.

When the working fluid is heated and expanded by the heater, the expansion piston descends to rotate the crankshaft, and when the expansion piston rises, the working fluid is pushed out and transferred to the compression cylinder side.

FIG. 3 is a sectional view showing a part of a conventional Stirling engine, in which one end of a plurality of heat transfer tubes 105 is connected to the top of an expansion cylinder 103 in which an expansion piston 101 is housed so as to be able to move up and down in the figure. The other end is connected to the regenerator 107 side. Reference numerals 109 and 111 are a cooling unit and a compression cylinder.

As shown in FIG. 4, which is an IV arrow diagram of FIG.
The combustion chamber 115 is housed in a combustion chamber 115 surrounded by a heat insulating material 113. In the upper part of the combustion chamber 115, the combustion chamber 115
A burner 117 that generates high-temperature gas is installed inside.

In such a conventional device, the 15Hfa gas generated by the burner 117 heats the heat transfer tube 105 while convecting inside the combustion chamber 115. As the heat transfer tube 105 is heated, the working fluid in the heat transfer tube 105 and the expansion cylinder 103 expands, pushing down the expansion piston 101 and rotating a crankshaft (not shown).

[Problems with the Background Art] However, in such a conventional Stirling engine, the flow velocity of high-temperature gas decreases as it moves away from the burner 117, and as shown in FIG.
Since the spacing between the heat transfer tubes 105 on the outer side is larger than that on the inner side, there is a tendency for a large amount of gas to flow outward, resulting in uneven flow rate distribution of high-temperature gas.
Heat exchange efficiency was decreasing.

[Objective of the Invention 1] The present invention was devised in view of the above-mentioned conventional problems, and is intended to equalize the flow rate distribution of high-temperature gas convecting within the combustion chamber and to increase the radiant heat m from the high-temperature gas. The objective is to provide a Stirling engine with improved heat exchange efficiency.

[Summary of the Invention] In order to achieve this object, the present invention provides a heating device in which a heat exchanger tube, in which one side of the working fluid passage is connected to the expansion cylinder and the other side is connected to the regenerator 21 side, is provided in the combustion chamber and connected to the compression cylinder. In the Stirling engine, the heat exchanger tube is surrounded by a red-hot body support, and a heat radiation ray is provided between the red-hot body support and the heat transfer tube. It is filled with a red-hot body that can generate .

[Effect of the invention] This invention covers the periphery of a group of heat exchanger tubes arranged in a combustion chamber with an incandescent body support, and fills the space between the incandescent body support and the heat exchanger tubes with an incandescent body capable of generating heat radiation. This not only equalizes the flow rate distribution of high-temperature gas in the combustion chamber, but also improves heat exchange efficiency by transmitting the heat held by the high-temperature gas to the heat exchanger tubes via the highly resistant incandescent body. I can do it.

[Fruit of invention/Il! Example] Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. FIG. 1 is a schematic sectional view of a Stirling engine, in which an expansion piston 3 is movably housed in an expansion cylinder 1, and a compression piston 7 is movably housed in a compression cylinder 5.

The expansion piston 3 and the compression piston 7 are connected via a connecting rod 9.11 to a crankshaft 13 which extends perpendicularly to the plane of the paper in FIG. In other words, the reflux shaft 13 is rotated by the movement of the expansion piston 3 and the compression pins 1 to 7.

A combustion chamber 17 surrounded by a heat insulating material 15 is formed in the 19th part of the FA3 clothing cylinder 1. A plurality of heat transfer tubes serving as heaters are attached to the outer peripheral portion of the top of the expansion cylinder 1. This heat transfer tube 19 has one side of a working fluid passage formed inside thereof connected to the expansion cylinder 1, and the direction of bending connected to the regenerator 21 side, which will be described later. As shown in the figure, the heat exchanger tubes 19 are arranged at approximately equal intervals on the outer circumference of the top of the expansion cylinder 1, and each group of heat exchanger tubes 19 is arranged in an open configuration 4 from the bottom to the top. There is.

An incandescent body receiver 23 made of, for example, a ceramic porous plate is attached at its lower end to the outer circumferential wall of the cylinder head 25 that covers the upper part of the expansion cylinder 1 so as to cover the periphery of the group of heat transfer tubes 19 . The incandescent body receiver 23 is provided with partition plates 27 and 29 that vertically divide the incandescent body receiver 23 into three parts.

Between the incandescent body receiver 23 and the heat transfer tube 19, a first tube is provided which emits radiation after receiving heat from the high-temperature gas and becoming red-hot.
The red hot water tank 31 has been filled. This first red heat 1 hole 31 is made of a ceramic ball, and the ball diameter is made smaller toward the upper side of the combustion chamber 17 where the high temperature gas flows, that is, toward the tip of the heat transfer tube 19, and where the high temperature gas flows slowly in the combustion chamber. 17
The diameter of the ball on the lower side of the heat exchanger tube 19, that is, on the base end side of the heat transfer tube 19 is increased. With this configuration, the flow rate distribution of high-temperature gas is made even more uniform.

Further, in the center of the upper surface of the cylinder head 25, a hollow cone-shaped incandescent body housing 33 is erected.
A second incandescent body 35 is filled in the incandescent body 11M container 33. The incandescent body accommodating body 33 is made of, for example, a relamic perforated plate like the incandescent body receiver 23, and the second incandescent body 3
5 is made of, for example, a ceramic ball in the same manner as the first incandescent body 31.

A cooler 37 is interposed between the regenerator 21 connected to the heat transfer tube 19 and the compression cylinder 5.

Further, a burner 39 is provided in the upper part of the combustion chamber 17, and combustion air taken in from the intake cylinder 44 is swirled and supplied by a swirler 45 provided around the burner 39 to be combusted. Exhaust gas generated within the combustion chamber 17 passes through a preheater 41 and is discharged from an exhaust stack 43.

Next, the operation of this device configured as J: will be explained.

High temperature gas generated by burner 39 convects within combustion chamber 17 . Nowadays, the high-temperature gas becomes a strong swirling flow due to the action of the swirler 45, so the flow velocity increases near the tip of the heat exchanger tube 19 near the burner 39 and slows down near the base end of one heat exchanger tube. 19 is provided with a first incandescent body 31, and this first incandescent body 31 has a smaller diameter on the distal end side of the heat exchanger tube 19 and a larger diameter on the base end side, and the heat exchanger tube 19 group is Since it is formed to open toward the tip side, the high-temperature gas flows almost perpendicularly to the heat transfer tube 19, and the velocity distribution of this gas flow is made uniform by the action of the ceramic balls. Therefore, heat transfer tube 19
The distribution of the high-temperature gas flow m that intersects with is made uniform. Also,
The first incandescent heat sink 31 receives the heat of the high-temperature gas and becomes red-hot, and the heat exchanger tube 19 is heated by the radiated heat, so that the heat exchange efficiency is improved.

Like the first incandescent heat shield 31, the second incandescent heat shield 35 also becomes red hot by receiving the heat of the high-temperature gas, and the heat transfer tube 19 is heated by the radiated heat.

When the heat transfer tube 19 is heated, the expansion piston 3 descends due to the expansion of the working fluid, causing the crankshaft 13 to rotate. Then, when the expansion piston 3 rises, the working fluid is transferred to the regenerator 21 side through one heat transfer tube, where it imparts heat to the heat storage material filled in the regenerator 21 and flows out to the cooler 37. The working fluid is cooled in the cooler 37 and compressed into the compression cylinder 5.
Flow into the side. The working fluid that has flowed into the compression cylinder 5 side is compressed during the upward stroke of the compression piston 7. The compressed working fluid is transferred to the regenerator 21 side, increases its temperature while taking heat from the heat storage material in the regenerator 21, and flows to the heat transfer tube 19, where it is again heated and expanded by the high-temperature gas.

Note that this invention is not limited to the above-described embodiments. For example, the first and ′;:A2 incandescent parts 31 and 35 may be made of a planar heat-resistant metal, ceramic, wire mesh, thread-like metal, or the like.

[Brief explanation of drawings]

Fig. 1 is an overall sectional view of a Stirling engine according to an embodiment of the present invention, Fig. 2 is a view taken in the direction of the ■ arrow in Fig. 1, Fig. 3 is a sectional view showing a part of a conventional Stirling engine, and Fig. 4. is a view taken in the direction of arrow I in FIG. 3. (Explanation of symbols representing main parts of the drawing) 1... Expansion cylinder 5... Compression cylinder 17...
・Combustion chamber 19...Heat transfer tube (heater) 21...
Regenerator 23... Red-hot body receiver 31... First red-hot body 37... Cooler 1m Fig. 2

Claims (1)

[Claims] A heater in which a heat transfer tube with one working fluid passage connected to the expansion cylinder and the other to the regenerator side is installed in the combustion chamber, a cooler connected to the compression cylinder, and a regeneration device that connects this cooler and the heater. 1. A Stirling engine having a heat exchanger tube, the heat exchanger tube being surrounded by an incandescent body holder, and a space between the incandescent body holder and the heat exchanger tube being filled with an incandescent body capable of generating heat radiation.