JPS5825556A - Starring engine with bayonet heater - Google Patents

Abstract

PURPOSE:To reduce the fluid resistance in the heat-exchager type and facilitate manufacture by making the heat-exchanger part of the heater of a starring engine in the bayonet type. CONSTITUTION:The working gas in the cylinder 6 flows through holes 21, 22, heaters 11, 12, regenerators 17, 18, coolers 26, 27 and holes 29, 30 by the action of a displacer piston 7 reciprocating in the cylinder 6 and a power piston 8. These heaters 11, 12 and coolers 26, 27 are arranged around the cylinder 6 at a constant spacing. Each heat-exchanger is composed of a heating inner tube 15 and an outer tube 13 surrounding the inner one, and the gas flowing receives heats with the gap 19 between the heat receiving outer 13 and inner 15 tubes, where the area for gas passage can be set off sufficiently even with its narrow construction as well as the area for receiving the heat can be provided wide. Besides the above, there is not need for piping with thin, much bent pipes, that will well facilitate its manufacture.

Description

[Detailed Description of the Invention] A conventional working gas heater for a Stirling engine is shown in Fig. 1.
As shown in Figure 2, it was a multi-bent pipe type in which a large number of bent pipes 2 and 3 were installed in parallel on top of a cylinder 1, but this type had many bends and welded parts, making the work extremely complicated and difficult. Moreover, there was a drawback that the flow loss of the working gas was large. In contrast, in the present invention, as shown in the conceptual diagram in FIG. 2, the working gas side of the heater is bayonet-shaped, and several bayonet-shaped heaters 4. The heater is constructed by arranging the holes in the shape of holes, and is therefore easy to work with, can withstand heat and expansion, and has the advantage of providing a heater with low resistance to the flow of working gas. The same applies to coolers. FIG. 3 is a sectional view of a portion of a cylinder according to an embodiment of the present invention. 6 is a main cylinder, 7 is a display service cylinder, 8 is a power piston, and 9 and 10 are a high temperature space and a low temperature space, respectively. The units 11 and 12 are bayonet type heaters, which mainly consist of an outer tube 13, 14 with a closed tip, and inner tubes 15, 16, etc. coaxially held inside the outer tube 13, 14.
16, etc. are opened at the bottom to the regenerative heat exchanger 17 and 18 side, and the internal gas of the inner tubes 15, 16, etc. is opened through the side gap 1.
It is configured to communicate with the high temperature space 9 through communication pipes 9, 20, etc. and communication pipes 21, 22, etc.

28 and 24 are fins provided on the outer surface of the outer tube Lll, 14, etc. 25.26 is a bayonet-type cooler that has the same internal structure as the heater 11.12 and is connected below the regenerative heat exchanger 17.18, etc., and has a large air cooling fin 27.
, 28 mag on its outer surface. 29.30 is the connecting pipe on the cold room side. As can be seen from this figure, the working gas passes through bayonet heaters 11, 12, regenerative heat exchangers 17, 18, bayonet coolers 1ia, 2o, etc. depending on the top and bottom of the display service tank 7, and then passes through the high temperature space 9 and the low temperature space 1.
It moves back and forth between 0 and performs the same operation as a normal Stirling engine.

As a feature of the present invention, since the heater and cooler are bayonet-shaped, the number of parts for each is small, and the outer tube 13
．． It is easy to work on the outside of the 14th grade, and the external insulation area can be increased by providing fins, and the side gap 19
．． 20 can provide a sufficient passage area for the working gas even if the gap is made quite small, so the flow resistance of the working gas is small, and since it is a bayonet type, there is no thermal shock against rapid heating and cooling. It can be extremely small. - For example, in a 15 horsepower class Stirling engine, when using a conventional multi-capillary type heater, 32 or more capillary tubes with an inner diameter of 1 skin and a length of 800 mm are required. Saiha using bayonet style, diameter 2
4rnfrL, side gap width 9.5 m? 7L,
It is only necessary to provide approximately 1,000 bayonet-type heaters with a length of 150 wrL, and the heat transfer coefficient can be increased and the flow resistance can be reduced. Since the width of the side gap can be freely adjusted experimentally, it is easy to obtain an optimally designed Stirling engine.

As described above, the present invention makes it possible to obtain a high-performance Stirling engine that is easy to work with, has good resistance to thermal shock, has low flow resistance, and has a bayonet-type heater and cooler that have good heat transfer.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing a conventional multi-bent tube heater. Figure 2
1 is a conceptual diagram of a bayonet-type heater according to the present invention. FIG. 3 shows a sectional view of a portion of a cylinder of a Stirling engine according to an embodiment of the present invention. 4, 5.11.12... Bayonet type working gas heater, 6... Cylinder body, 13.14... Gas heater outer tube, 15.16... Gas heater inner tube, 25 .26
... Bayonet type working gas cooler. 3 Commissioner Shima of the Patent Office 1) Mr. Haruki ■Display of the case 1982 Patent Application No. 123594 Stirling Engine with Bayonet Heater 3 Relationship with the case of the person making the amendment Patent applicant 4, Date of the amendment order! 1987, 1st, 6th, 5th
, Number of inventions increased by amendment 06, Subject of amendment

Claims (1)

[Claims] A Stirling engine with a bayonet type heater in which both or one of the working gas heater and cooler is a bayonet type in which the working gas reciprocates once through an inner tube provided inside the Stirling engine.