JPH0645178Y2 - Rotary heat storage type heat exchanger core - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core of a rotary heat storage type heat exchanger used in a gas turbine apparatus or the like.

[0002]

2. Description of the Related Art Recently, a gas turbine apparatus has been mounted on a passenger vehicle, and the passenger vehicle is being driven by the output generated by the gas turbine apparatus.

[0003] In such a gas turbine apparatus for automobiles, recycle recycling is adopted in order to improve net thermal efficiency. A rotary heat storage type heat exchanger is used in the structure for recovering heat from the exhaust gas.

That is, as shown in FIG. 2, the rotary heat storage type heat exchanger 1a has a gas passage 1 extending from the turbine to the outside.
A matrix type core 3 (heat storage body) having a honeycomb structure is provided on the way between the compressor and the air passage 2 from the compressor to the gas passage as the core 3 rotates about the axis. 1 and the air passage 2 are alternately passed. Thereby, the heat of the gas heats the core 3 when passing through the honeycomb portion 3a, and the heat heats the air passing through the honeycomb portion 3a on the air passage 2 side. As a result, heat is recovered from the exhaust gas, and this heats the compressed air before the combustion inlet.

Reference numeral 4 denotes a ring gear for driving the core 3 using a pinion (not shown), which has a cushioning material 5 (for example, silicone rubber or sponge) mounted on the outer peripheral surface of the core 3.

[0006] Conventionally, the core 3 of such a rotary heat storage type heat exchanger has a ceramic matrix core in order to cope with a high cycle temperature (heat exchange efficiency: large).
That is, a disk-shaped core body 3b is used in which a large number of honeycomb-shaped small passages 6 are formed from the ceramic wall portion to the inside from one surface side to the other side surface.

By the way, the core body 3b moves while being exposed to both the high-temperature gas discharged from the turbine to the outside and the low-temperature air entering the combustor from the compressor. Directional thermal stress is generated. Particularly, a large thermal stress is generated on the outer peripheral side of the core body 3b.

Therefore, conventionally, in the core 3, as shown in FIGS. 3 (a) and 3 (b), the core body 3b is provided at a plurality of locations on the outer periphery thereof from the outer peripheral surface of the core body 3b to the center of the core body 3b. There is a slot 8 extending to the. Generally, a slot 8 having a slot width δ (separation distance) larger than the wall thickness t (about 0.5 mm) and the space width h (about 1 mm) of the honeycomb portion 3a is formed obliquely so that the high temperature side is deep and the low temperature side is shallow. Yes (because the temperature difference is large on the high temperature side). By providing the slots 8 in this way, the thermal stress in the circumferential direction of the core body 3b is relaxed.

[0009]

However, when thermal stress is applied to the core 8, stress concentration occurs at the end portion 9 of the slot 8 facing the center of the core body 3b. This stress concentration may cause a crack in the end portion 9 of the slot 8, and improvement is desired.

The present invention has been made in view of such circumstances, and an object thereof is to provide a core of a rotary heat storage type heat exchanger capable of preventing stress concentration on an end portion of a slot. Especially.

[0011]

In order to achieve the above object, the core of the rotary heat storage type heat exchanger of the present invention has a large number of passages penetrating from one surface side to the other side surface, and has an outer peripheral portion. In a core of a rotary regenerative heat exchanger having a disk-shaped core body having a slot extending from the outer peripheral surface to the center, in the end portion of the slot facing the center side of the core body, This is because an arc-shaped cutout having a large outer shape was provided.

[0012]

According to the core of the rotary heat storage type heat exchanger of the present invention, the thermal stress in the circumferential direction of the core body, which tends to concentrate on the end portion of the slot, is dispersed by the arcuate notch. This can prevent the core from cracking due to stress concentration.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in FIGS. 1 (a) and 1 (b). In the drawings, the same parts as those described in the above-mentioned "Prior Art" are designated by the same reference numerals, and the description thereof will be omitted. In this section, different parts (main parts of the invention) will be described. To

The present embodiment is different in that an arcuate notch 10 is provided in the end portion 9 of the slot 8. For more information,
The notch 10 has a shape larger than the slot width δ. Specifically, the notch 10 has a slot width δ of about 10
An arc shape with a diameter of about double is used. This notch 1
0 is provided all over the end portion 9 of the slot 8 so as to disperse the stress concentration applied to the end portion 9 in the slot 8.

The core body 3b thus constructed moves while being exposed to both the high temperature gas discharged from the turbine to the outside and the low temperature air entering the combustor from the compressor. Then, when heat exchange is performed, the core body 3
A circumferential thermal stress is generated in b.

At this time, the stress is relaxed in each slot 8 formed in the core body 3b. At this time, the stress that tends to concentrate on the end portion 9 of the slot 8 is reduced by the arc-shaped notch portion 10.
Is dispersed in. Therefore, stress concentration on the end portion 9 of the slot 8 is prevented, and the stress concentration causes the slot 8 to be concentrated.
It is possible to prevent the occurrence of cracks in the root part of the.

In one embodiment, the end portion 9 of the slot 8 is
Arc-shaped notch 10 for dispersing stress over the entire
However, the present invention is not limited to this, and the arcuate notch 10 may be provided only on the high temperature side of the end portion 9 of the slot 8 where thermal stress is particularly likely to occur. That is, the arcuate notch 10 is formed at least on the high temperature side of the end portion 9 of the slot 8.
If it is provided, the same effect as that of the above-described embodiment can be obtained.

[0018]

As described above, according to this invention,
The concentration of stress on the end portion of the slot is prevented, and the occurrence of cracks at the root portion of the slot due to the concentration of stress can be prevented.

[Brief description of drawings]

FIG. 1A is a front view showing a core of a rotary heat storage type heat exchanger according to an embodiment of the present invention. (B) is a side view of the core.

FIG. 2 is a view showing a rotary heat storage type heat exchanger attached to a gas turbine for an automobile.

FIG. 3A is a front view showing a core used in a conventional gas turbine for an automobile. (B) is a side view of the core.

[Explanation of symbols]

3b ... Core body, 6 ... Passage, 8 ... Slot, 9 ... End portion, 10 ... Arc-shaped notch.

Claims (1)

[Scope of utility model registration request] 1. A rotary heat storage type heat exchange having a disk-shaped core main body having a large number of passages penetrating from one surface side to the other side surface inside, and having a slot extending from the outer peripheral surface to the center in the outer peripheral portion. In the core of the container, an end portion of the slot facing the center of the core body is provided with an arcuate cutout having an outer shape larger than the spacing distance of the slot. core.