JPH05272406A - Heater head of hot gas engine - Google Patents

Abstract

PURPOSE:To heat working gas in each heater tube uniformly by arranging a plurality of heater tubes between manifolds circumferencially, relatively enlarging the diameter of an outer heater tube from that of the center heater tube, and uniformalizing the intervals between respective pairs of adjacent heater tubes simultaneously. CONSTITUTION:A plurality of heater tubes 16 are provided to connect a cylinder 17 to a heat accumulator housing 18. The heater tubes 16 are arranged circumferencially on manifolds 19, 21, and the intervals so between respective pairs of adjacent heater tubes 16a to 16d are uniformalized. Diameters r3, r4 of the heater tubes 16c, 16d arranged outward are enlarged relatively from diameters r1, r2 of the heater tubes 16a, 16b arranged in the center thereof. The flow amounts of working gas which flows in respective heater tubes 16a to 16d are uniformalized. Since the intervals SO between respective pairs heater tubes 16 are uniformalized, working gas in each of heater tubes 16a to 16d is heated uniformly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater head for a hot gas engine.

[0002]

2. Description of the Related Art As a conventional technique for a combustor of a Stirling engine, there is, for example, "Heater gas engine heater head" disclosed in Japanese Utility Model Laid-Open No. 60-155759. This conventional technique will be described with reference to FIG. 4. A cylinder 72 forming an expansion space 71 of a hot gas engine and a heat storage housing 73 are connected via a heater tube 74. Here, in order to interpose a plurality of heater tubes 74, the cylinder 7
Manifolds 75 and 76 are arranged between the heater 2 and the heater tube 74, and between the heat storage housing 73 and the heater tube 74, respectively. And the expansion space 71
The working gas reciprocates between the compression space (not shown) and the compression space (not shown) via the heat storage housing 73 and the heater tube 74.

At this time, the cylinder 72 and the manifold 7
Since the throttle portions 77 and 78 are present at the connection portion with 5 and the connection portion between the heat storage housing 73 and the manifold 75, the flow of the working gas concentrates at the center of the manifolds 75 and 76.

The concentration of the working gas causes variations in the flow rate of the working gas in the plurality of heater tubes 74, so that the working gas cannot be efficiently heated. So manifold 7
Rectifying plates 79 and 80 are arranged in the centers of the heater tubes 5 and 76, respectively, so that the working gas can easily flow to the heater tubes 74 arranged outside.
The working gas is made to flow uniformly over the entire area.

[0005]

However, due to the presence of the straightening vanes 79 and 80, the flow of the working gas is enlarged or reduced, and the pressure loss of the working gas is increased. As a result,
This leads to a decrease in the output of the hot gas engine and a malfunction.

Therefore, it is a technical object of the present invention to uniformly heat the working gas in the plurality of heater tubes without obstructing the flow of the working gas.

[0007]

[Constitution of the invention]

[0008]

The technical means of the present invention taken to solve the above-mentioned technical problems of the present invention is a plurality of heater tubes connecting a cylinder and a regenerator housing, and a cylinder and a heater. A heater head of a hot gas engine is configured with a manifold arranged between the heater tube and the heat storage housing and between the heater tube and the heater tube. That is, the intervals between the heater tubes are made uniform, and the tube diameter of the heater tubes arranged outside is relatively larger than the tube diameter of the heater tubes arranged in the center.

[0009]

According to the above-mentioned technical means of the present invention, the tube diameter of the heater tube arranged outside is relatively larger than the tube diameter of the heater tube arranged in the center, and the working gas flowing through each heater tube is large. Flow rate is uniformized. At this time, since the heater tubes are evenly spaced, the working gas in any heater tube is uniformly heated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the technical means of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a heater head of a hot gas engine.
Here, the combustion space 11 of the hot gas engine is composed of a housing 12 having a heat insulating material, and a fuel injection nozzle 13 and a swirler 14 are arranged at the center of the top of the housing 12. The swirler 14 gives a swirling flow to the combustion air, and an unillustrated air preheater and blower and a passage 15 are provided.
Through the. Below the combustion space 11, a plurality of heater tubes 16 of a hot gas engine are arranged. The heater tube 16 connects the cylinder 17 and the heat storage housing 18, and the heater tube 16 and the cylinder 17 are connected to each other.
Manifolds 19 and 21 are arranged between the heater tube 16 and the heat storage housing 18, respectively. The exhaust gas of the combustion gas generated in the combustion space 11 flows out from the exhaust outlet 20 to the air preheater.

Referring to FIG. 2, the first embodiment will be described.
Multiple heater tubes 16a, 16b, 16c, 16d
Are arranged circumferentially on the manifolds 19 and 21, and the spacing between adjacent heater tubes is s0 and is uniform. However, the tube diameters r3, r4 of the heater tubes 16c, 16d arranged on the outside are the same as the tube diameters r1, r1 of the heater tubes 16a, 16b arranged in the center.
It is relatively thicker than r2. Incidentally, in the present embodiment, the relationship between the tube diameters is r1 <r2 <r3 = r4,
It is not particularly limited to this combination. The arrangement of the heater tubes 16 is symmetrical in FIG.

The operation of the heater head of the hot gas engine having the above construction will be described.

The air sent from a blower (not shown) is
It is preheated by the high-temperature exhaust gas in the air preheater, heated, and guided to the swirler 14. The air to which the swirl flow is given by the swirler 14 is mixed with the fuel injected from the fuel injection nozzle 13 and ignited to perform continuous combustion. The high temperature combustion gas generated by this continuous combustion is the heater tube 1
Guided to 6. Here, heat exchange is performed between the high-temperature combustion gas and the working gas flowing in the heater tube 16, the working gas in the heater tube 16 is heated and the combustion gas is cooled, and the combustion gas is burned in the combustion space 11. Is exhausted to the outside from the exhaust gas outlet 20 located above.

Here, the working gas tends to concentrate on the heater tubes 16a, 16b arranged in the center, but since the tube diameters of these are small and the flow resistance is large, the heater tube 1
The flow rate of the working gas flowing through 6a and 16b is limited. On the other hand, a heater tube 16 having a large pipe diameter arranged outside
Since the flow resistance of c and 16d is small, the working gas relatively easily flows. Therefore, a plurality of heater tubes 16
Since the flow of each working gas is uniform and the intervals between the adjacent heater tubes are also uniform at s0, the flow of the high temperature combustion gas becomes uniform, and the working gas is uniformly heated in the entire heater tube 16. To be done.

[0016]

As described above, according to the present invention, the tube diameter of the heater tube arranged outside is inversely proportional to the flow rate distribution of the working gas in the manifold, and the tube diameter of the heater tube arranged in the center is changed. By making it relatively thicker than the tube diameter, the working gas flow rates of the plurality of heater tubes are made uniform. At this time, the intervals between the heater tubes are uniform, and the working gas is uniformly heated as a whole.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a heater head of a hot gas engine according to an embodiment of the present invention.

FIG. 2 shows an enlarged cross-sectional view of a main part in FIG.

FIG. 3 shows a configuration diagram of a heater head of a conventional hot gas engine.

[Explanation of symbols]

 16 heater tubes, 17 cylinders, 18 heat accumulator housings, 19 and 21 manifolds, 22 and 23 fins,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Murakami 2-1-1 Asahi-cho, Kariya city, Aichi Prefecture Aisin Seiki Co., Ltd.

Claims (1)

[Claims] 1. A plurality of heater tubes connecting a cylinder and a regenerator housing, a manifold disposed between the cylinder and the heater tube, and between the regenerator housing and the heater tube, respectively. The heater tubes are arranged in a circumferential shape on the manifold to make the intervals between the adjacent heater tubes uniform, and to arrange the heater tubes arranged outside at the center of the tube diameter. A heater head for a hot gas engine, which is relatively thicker than a tube diameter of the heater tube.