JPS6330073Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) This invention relates to a sealing device for a rotary regenerative heat exchanger for a gas turbine engine.

(Background Art) In order to improve the thermal efficiency of a gas turbine as a vehicle engine, it is known to include a rotary heat storage type heat exchanger that recovers exhaust heat discarded from the gas turbine and warms intake air.

In this case, exhaust air and intake air pass through the heat storage core of the heat exchanger, but in order to prevent these from mixing with each other, a sealing device is installed on the end face of the heat storage core that connects to the intake and exhaust passages. ing.

This type of sealing device has conventionally been constructed as shown in FIGS. 1 and 2 (see Japanese Patent Laid-Open No. 176589/1989).

Reference numeral 1 is a passage for high-pressure air pumped from the gas turbine compressor, and 2 is a passage for high-temperature, low-pressure exhaust gas that has finished working in the turbine.

A heat storage core 3 is arranged so as to cross these passages 1 and 2. The heat storage core 3 is rotatably supported by the casing 4 about an axis 5, and has a honeycomb-shaped cross section, for example, so as to allow passage of high-temperature gas or low-temperature intake air parallel to the axis.

The heat storage core 3 has a ring gear 6 on its outer periphery that meshes with a pinion of a drive device (not shown), rotates as the drive device operates, recovers heat from high-temperature gas as it passes through on the exhaust passage 2 side, and converts the heat into the intake air. The heat recovered on the passage 1 side heats the pressurized air passing through.

A sealing device 7 is provided to prevent the pressurized air in the passage 1 from leaking to the passage 2 side.

The sealing device 7 includes seal sliders 8 and 9 attached to the casing 4 so as to slide along the outer periphery of both end surfaces of the heat storage core 3, and urges the seal sliders 8 to tightly contact the end surfaces of the heat storage core 3. In this case, the spring means 10 also has the role of airtightly sealing the gap between the seal sliding body 8 and the casing 4 disposed on the upstream side of the low-temperature air passage 1.

The seal sliding body 8 or 9 is composed of a circumferential seal part 8A or 9A and a straight seal part 8B or 9B that separates both passages 1 and 2, and one of the seal sliding bodies 8 is a part where low temperature air accumulates heat. A circumferential seal portion 8A is provided so that the core 3 and seal sliding body 9 can be cooled from the outer periphery.
Half of the passageway 1 side has been removed.

By the way, in the sealing device that prevents the intake air and the exhaust air from mixing in this way, the seal sliding body 9 on one fixed side has a thermal sprayed layer mainly composed of nickel oxide on the sliding surface with the heat storage core 3. formed by 11,
As shown in FIG. 2, the casing 4 is securely screwed through the flange 12, but due to thermal deformation of the casing 4, and due to the difference in thermal expansion due to the temperature difference between the seal sliding body 9 and the casing 4, the seal is sealed. As shown by the one-dot chain line in the figure, the sliding body 9
It warps around the fixed part by the screw 12 as a fulcrum,
As a result, there was a problem in that the flatness of the seal with the heat storage core 3 was impaired, and heat loss increased as low-temperature air leaked.

Note that 13 is a heat insulating material installed to reduce thermal expansion of the seal sliding body 9 and the casing 4.

(Purpose of the invention) This invention was made by paying attention to these problems, and was designed to create a sealing device that does not damage the flatness of the seal even due to differences in thermal expansion between the seal sliding body and the casing. For the purpose of providing.

(Structure and operation of the device) Therefore, this device fixes the seal sliding body to the casing airtightly around the entire circumference via a highly flexible foil body, and also A protrusion is formed on one side, and a long hole is formed on the other side to which the protrusion engages movably in the radial direction. According to this, the difference in thermal expansion between the seal sliding body and the casing is absorbed by the deformation of the foil body, and the sliding resistance in the rotational direction acting on the seal sliding body is supported, so that the seal flatness of the seal sliding body is is well maintained.

(Example) This invention will be explained below according to the example shown in FIG. Note that the same parts as in FIGS. 1 and 2 are designated by the same reference numerals.

The seal sliding body 9 has an end surface 25 in sliding contact with the heat storage core 3
is formed of a sprayed layer 11 mainly composed of nickel oxide, and the opposite end surface 26 is formed on the inner wall 2 of the casing 4.
7, and a highly flexible foil body 14 is welded to the outer periphery over the entire circumference.

Incidentally, reference numeral 15 indicates a protrusion formed on the outer periphery of the seal sliding body 9 in order to facilitate welding of the foil body 14.

Then, the outer edge of the foil body 14 is tightened to the casing 4 through the flange 16 with bolts 17 in an airtight manner all around.

Further, a cylindrical protrusion 9 is formed on the inner surface of the casing 4 that is in close contact with the seal sliding body 9, and a long hole 20 that engages with the protrusion 19 in a radial direction is formed in the seal sliding body 9. Ru.

With this configuration, by sandwiching the heat storage core 3,
The force of the spring means 10 that presses the seal slider 8 on the movable side acts as sealing pressure on the seal slider 9 on the fixed side, but this pressure is applied to the casing 4 via the support end surface 26 of the seal slider 9. Therefore, the seal sliding bodies 8, 9 on both sides of the heat storage core 3
always maintains a predetermined sealing pressure to ensure airtightness of the contact surfaces.

In this case, the seal sliding body 9 is connected to the casing 4 through the highly flexible foil body 14, so even if a difference in thermal expansion occurs between the seal sliding body 9 and the casing 4 due to the heat of the high-temperature gas flowing through the passage 2. Along with this, the foil body 14 undergoes flexural deformation as shown by the dashed line in the figure and absorbs the difference in thermal expansion, so that uneven thermal distortion does not occur in the seal sliding body 9, and therefore the seal plane is There is no loss of quality.

Moreover, since there is no need to worry about thermal distortion due to the difference in thermal expansion between the seal sliding body 9 and the casing 4, the thickness of the heat insulating material 13 can be reduced, which means that the passage 2
Also, since the effective area of the heat storage core 3 can be expanded, thermal efficiency can be improved.

Furthermore, the protrusion 10 and the elongated hole 20 position the seal sliding body 9 with respect to the casing 4, and their engagement supports the sliding resistance in the rotational direction that acts on the seal sliding body 9 as the heat storage core 3 rotates. Therefore, the foil body 14 is not required to have any strength,
It becomes possible to make it even more flexible.

Incidentally, since the elongated hole 20 is adapted to be engaged with the protrusion 19 so as to be displaceable in the radial direction, thermal expansion of the seal sliding body 9 is not restricted.

FIG. 4 shows another embodiment, in which a protrusion 19A is formed on the seal sliding body 9 and an elongated hole 20A is formed on the casing 4, but the same effect as the embodiment shown in FIG. 3 can be obtained. It will be done.

Note that the foil body 14 has the fifth and sixth
As shown in the figure, it is preferable to form a bent portion 18 concentric with the seal sliding body 9.

Further, the foil body 14 may be welded to the flange 16 in an airtight manner over the entire circumference.

(Effects of the invention) In summary, according to this invention, the seal sliding body is fixed to the casing airtightly all around through the highly flexible foil body, and one of the abutting surfaces of the casing and the seal sliding body is Since a protrusion is formed on one side and a long hole is formed on the other side to which this protrusion engages movably in the radial direction, the flatness of the seal is not impaired even by differences in thermal expansion between the seal sliding body and the casing, and the flatness of the seal is maintained. Effects such as ensuring sealing performance can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional device, Fig. 2 is a partially enlarged sectional view thereof, Fig. 3 is a partially enlarged sectional view of an embodiment of this invention, and Fig. 4 is a partially enlarged sectional view of another embodiment. The sectional view and FIGS. 5 and 6 are partial sectional views showing modified examples of the foil body. 3... Heat storage core, 4... Casing, 7... Seal device, 8, 9... Seal sliding body, 14... Foil body, 19, 19A... Projection, 20, 20A...
Long hole.

Claims (1)

[Scope of utility model registration request] In a sealing device for a rotary heat storage type heat exchanger that slides on the end face of a rotating heat storage core and prevents mixing of low-pressure high-temperature gas and high-pressure low-temperature gas, the seal sliding body is held between the heat storage core and the casing. A highly flexible foil body is provided around the entire circumference, and this foil body is airtightly fixed to the casing, and a protrusion is provided on one side of the contact surface between the casing and the seal sliding body, and a protrusion is provided on the other side. 1. A sealing device for a rotary heat storage type heat exchanger, characterized in that a projection is formed with an elongated hole that is movably engaged in a radial direction.