JPH0450438Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat storage body for a heat exchanger for a gas turbine engine.

[Prior art] A rotary regenerative heat exchanger for a gas turbine engine is disclosed in Japanese Utility Model Publication No. 56-24860 and U.S. Pat. No. 4,269,262.
It is already known from the specification of No. 1, US Pat. No. 4,148,354, etc. This will be explained in advance with reference to FIGS. 2 to 4 as follows.

The heat storage body 1 is made of ceramic, has a large number of gas passages 2 in a direction parallel to the axis, and is rotatably supported. The heat storage body 1 has two passages 3 and 4 in front and behind it.
High-temperature exhaust gas from the turbine outlet flows through one passage 3, and air supply to the burner flows through the other passage 4. When the exhaust gas passes through the heat storage body 1, the heat energy of the exhaust gas is stored in the heat storage body 1, and when the heat storage body 1 rotates and the high temperature part comes to the air supply side, the stored thermal energy is radiated to the supply air. It's becoming like that.

In order to rotate the heat storage body 1, a ring gear 8 is attached to the heat storage body 1 via an elastic body 7, and rotational force is applied to the ring gear 8.

[Problems to be Solved by the Invention] However, the elastic body 7 is usually made of rubber in order to absorb the difference in thermal expansion between the ceramic heat storage body 1 and the metal ring gear 8, and has poor heat resistance. The rubber 7 may be damaged due to an increase in temperature due to heat transfer from the high-temperature gas flowing through the heat storage body 1, and in some cases, the ring gear 8 may come off from the heat storage body 1, making it impossible to rotate the heat storage body. There is also.

The present invention aims to improve the durability of the elastic body by lowering the temperature of the elastic body mounting portion on the outer periphery of the heat storage body to below the heat resistance limit of the elastic body.

[Means for Solving the Problems] The heat storage body of the heat exchanger for a gas turbine engine of the present invention that achieves this object has a large number of gas flow passages extending in a direction parallel to the axis, and has an elastic body on the outer periphery. In a heat storage body of a heat exchanger for a gas turbine engine to which a ring gear for rotational drive is attached through the heat storage body, a heat storage body is provided on the outer periphery of the heat storage body from the outer circumferential surface of the heat storage body toward the inside in the radial direction. A cut groove is formed, a heat dissipation fin made of an annular elastic body is fitted into the groove, the elastic body and a rotating ring gear are arranged on the hot gas outlet side, and the above-mentioned ring gear is placed on the high temperature gas inlet side. Consists of fins.

[Operation] In the heat storage body of the heat exchanger for a gas turbine engine described above, turbine exhaust gas at about 700°C enters the heat storage body, gives heat to the heat storage body, and its temperature drops to about 300°C. It comes out from the heat storage body. Atmospheric gas at about 250°C to 280°C flows around the outer periphery of the heat storage body to cool the outer periphery.

Since the heat storage body has grooves and fins are fitted, the flow of heat is blocked by the fins on the upstream side of heat conduction to the elastic body attachment part, and the heat is removed by the fins. The temperature of the outer periphery of the heat storage body in the elastic body mounting portion becomes approximately 280° C. or lower due to the cooling caused by the atmospheric gas. The heat resistance temperature of rubber is approximately 280°C, so rubber can withstand it sufficiently. That is, by providing the heat dissipation fins, the temperature of the heat storage body in the elastic body mounting portion is reduced, the durability of the elastic body is improved, and phenomena such as detachment of the ring gear do not occur.

Furthermore, since the grooves are cut radially inward from the outer peripheral surface of the heat storage element over the entire outer circumference of the heat storage element, thermal strain in the axial direction of the heat storage element can be alleviated over the entire circumference. .

[Embodiments] Hereinafter, preferred embodiments of the heat storage body of a heat exchanger for a gas turbine engine according to the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The heat storage body 11 is a porous columnar body made of ceramic,
A large number of holes, that is, gas flow paths as shown in FIG. 4, are provided in a direction parallel to the axis. High-temperature exhaust gas passes through one part of the gas flow path, and low-temperature supply air passes through another part. A metal ring gear 13 is attached to the outer periphery of the heat storage body 11 via an elastic body 12, and by applying rotational force to the ring gear 13, the heat storage body 11 rotates at about 20 rpm. The elastic body 12 plays the role of a buffer material to absorb the difference in thermal expansion in order to prevent the heat storage body 11 from being destroyed due to direct contact between the ceramic heat storage body 11 and the ring gear 13, and is usually made of heat-resistant rubber. is used.

A groove 15 is formed in the outer periphery of the heat storage element 11 and is cut radially inward from the outer peripheral surface of the heat storage element over the entire circumference of the heat storage element. The body fins 14 are fitted. The elastic body 12 and the ring gear 13 are arranged on the high temperature gas outlet side in the axial direction of the heat storage body 11,
The fins 14 are arranged on the high temperature gas inlet side. As a result, the fins 14 are attached to the upstream side in the heat flow direction of the elastic body 12 attachment portion of the heat storage body 11 . The fins 14 are made of an elastic material, such as rubber, that can be fitted to the ceramic heat storage body 11 without damaging each other even if a difference in thermal expansion occurs between the fins 14 and the ceramic heat storage body 11.

Further, a heat pipe 16 may be embedded inside the fin 14 to improve the transfer of heat between the inner circumferential portion and the outer circumferential portion of the fin 14.

To explain the operation of the above embodiment, high temperature gas (approximately 700°C) flows into the heat storage body 11, undergoes heat exchange, and exits as low temperature gas of 300°C. The ring gear 13 and elastic body 12 are approximately
Although it is in an atmosphere of 250 degrees Celsius, if it continues as it is, the temperature will rise due to heat conduction from the high-temperature gas flowing through the heat storage element 11, causing thermal stress due to the difference in thermal expansion, causing damage to the heat storage element 11 and the ring gear. There is a risk that 13 members will leave. However, in this embodiment, the fin 1
4 is provided, and furthermore, it is located upstream of the elastic body attachment part in terms of thermal flow and is fitted into the groove 15, so that the heat flow of the high temperature gas is transferred to the fin 14.
At the same time, part of the heat flow is radiated from the fins 14, and the temperature of the outer circumference of the heat storage body 11 of the rubber-attached portion is lowered. Since the elastic body 12 can withstand temperatures of approximately 280° C., thermal damage to the elastic body 12 is prevented due to the temperature drop at the outer peripheral portion of the heat storage body 11.

Furthermore, when the heat pipe 16 is provided, the heat pipe 16 facilitates the movement of heat within the fins 14, and the cooling effect of the fins 14 is promoted.

[Effect of the invention] According to the heat storage body of the heat exchanger for a gas turbine engine of the present invention, grooves are formed radially inward from the outer peripheral surface of the heat storage body over the entire outer circumference of the heat storage body. A heat dissipation fin made of elastic material was fitted into this groove, an elastic body and a rotating ring gear were placed on the high temperature gas outlet side, and a fin was placed on the high temperature gas inlet side, so the elastic body could be attached by the fin. The flow of heat to the part is blocked and a part of the heat is radiated, and the temperature of the part of the heat storage body to which the elastic body is attached falls below the heat resistance temperature of the rubber, and the durability of the elastic body can be improved.
Therefore, damage to the elastic body rubber is eliminated, so that the problem of the ring gear and the elastic body being separated and the heat storage body not rotating can be eliminated. Further, since the fins are made of an elastic material, even if a difference in thermal expansion occurs between the heat storage body and the fins, they will not damage each other. Furthermore, since the grooves are formed all around the outer periphery of the heat storage element, thermal strain in the axial direction of the heat storage element can be alleviated over the entire circumference, and deterioration of the heat storage element can be suppressed. .

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a heat storage body of a heat exchanger for a gas turbine engine according to an embodiment of the present invention, Fig. 2 is a schematic sectional view of a conventional heat storage body, and Fig. 3 is an exploded view of a conventional heat exchanger. FIG. 4 is a partially cutaway perspective view of a conventional heat storage body. 11... heat storage body, 12... elastic body, 13... ring gear, 14... fin, 15... groove, 16...
…heat pipe.

Claims (1)

[Scope of utility model registration request] In a heat storage body for a heat exchanger for a gas turbine engine, which has a large number of gas flow passages extending in a direction parallel to the axis and a ring gear for rotational driving is attached to the outer periphery via an elastic body, on the outer periphery of the heat storage body, A groove is formed radially inward from the outer peripheral surface of the heat storage body over the entire outer circumference of the heat storage body, and a heat dissipation fin made of an annular elastic material is fitted into the groove to dissipate high-temperature gas. A heat storage body for a heat exchanger for a gas turbine engine, characterized in that the elastic body and the rotating ring gear are arranged on the outlet side, and the fins are arranged on the inlet side of high-temperature gas.