JPS5937592Y2 - Sealing device for rotary regenerative heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device for a rotary regenerative heat exchanger for a gas turbine motor for an automobile.

Generally, in a gas turbine prime mover, a rotary regenerative heat exchanger that recovers exhaust heat is used to raise the temperature of intake air and effectively utilize the thermal energy of exhaust gas to increase the thermal efficiency of the turbine.

This will be explained with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a housing, and the housing 1 includes an intake passage 2 for introducing compressed air, which is also fed to a compressor 20, into a combustor 21, and an exhaust passage 3 for gas discharged by rotating a power turbine 23. Separated.

Reference numeral 4 denotes a honeycomb-shaped heat storage body rotatably disposed astride the intake passage 2 and exhaust passage 3, and as the heat storage body 4 rotates, the low-temperature compressed air supplied from the compressor 20 is heated. The high-temperature combustion gas is heated by passing through the gas and sent to the combustor 21, while the high-temperature combustion gas is cooled and discharged out of the system.

To specifically explain the gas turbine drive system, the high temperature compressed air heated by the heat storage body 4 as described above is
The combustion gas generated in the combustor 21 is sent to the combustor 21 for combustion of fuel, and the compressor turbine 2
2 and drives a compressor 20 coaxially therewith.

After rotating the compressor turbine 22, the combustion gas rotates the next-stage power turbine 23, and output is taken out from an output shaft (not shown).

The exhaust passage 3 then passes through this power turbine 23.
The combustion gas led out is discharged outside the system after heat exchange in the heat storage body 4.

Incidentally, a stationary side seal member 5 and a suppression side seal member 6 are provided at the ends of the high-temperature side peripheral walls of the intake passage 2 and the exhaust passage 3 and at the low-temperature side peripheral wall end of the exhaust passage 3, respectively. The passages 2 and 3 are arranged so as to be in contact with each other, and the airtightness between the passages 2 and 3 is maintained.

Normally, the national seal member 5 has a holder 10 on the Ujipuffer fish 1 side. On the other hand, the suppression side seal member 6 is attached movably in the axial direction via a holder 101 and a push plate 14, and the heat storage body 4 is fixed as the seal members 5 and 6 wear out. It is pressed against the side sealing member 5 side so that a proper sealing effect can always be obtained.

However, in such a conventional sealing device for a rotary regenerative heat exchanger, one of the sealing members 5 was directly fixed to the housing 1, so when the operating conditions of the engine changed, the nozzle 1 When it is slightly deformed due to stress, a gap is created between the sliding surfaces of the stationary side seal member 5 and the heat storage body 4, and as a result, the airtightness may be broken and compressed air or exhaust gas may leak.

In addition, in this case, the pressure balance between the seal member 5 and the seal member 6 that sandwich the heat storage body 4 is lost, so the heat storage body 4
There was also a problem in that the contact resistance of the heat exchanger changed and the driving force of the heat exchanger fluctuated.

The present invention was developed by focusing on these conventional problems, and includes an elastic diaphragm interposed between the sealing material on the fixed side and the housing, as well as a stopper to prevent excessive displacement of the sealing material. By providing a sealing device for a rotary regenerative heat exchanger, the sealing device can follow the deformation of the engine housing and always ensure good airtightness even if the engine housing is deformed.

This invention will be explained below based on the drawings.

3 to 5 show an embodiment of the present invention.

In FIG. 3, a holder 10. which holds the engine housing 1 and the stationary seal member 5. A diaphragm 30 made of an elastic member is interposed between the two.

As shown in FIGS. 4 and 5, the diaphragm 30, which has approximately the same shape as the seal member 5, is made by welding dish-shaped ring members 30130° back to back, and has a partition section in the center between the intake passage 2 and the exhaust passage 3. It has 31.

The contact surface 33 of the diaphragm 30 with respect to the housing 1 and the holder 10b is hermetically bonded (adhered), and furthermore, by the press plate 14 that presses the sealing member 6 on the suppression side,
In order to prevent the heat storage body 4 from being excessively displaced toward the fixed side, a ring-shaped stopper 32 is provided on the housing 1 to protrude.

On the other hand, the effective pressure receiving area of the seal member 5.6 for the compressed air supplied to the annular passage 9 outside the heat storage body 4 is such that the seal member 6 on the suppression side is slightly larger than the seal member 5 on the other side. It is set.

As a result, from the pressing side seal member 6 to the other seal member 5
A suppression difference is generated in the direction of , and the seal member 5°6 can be displaced following wear.

Next, the effect will be explained.

The high-pressure air in the annular passage 9 presses both seal members 5 and 6 against both surfaces of the heat storage body 40 to maintain airtightness.

At this time, since the effective pressure-receiving area of the seal member 6 on the suppression side is large, as the seal member wears, the entire member moves toward the other seal member 5 to maintain good sealing performance at all times. .

On the other hand, if the housing 1 is distorted due to thermal deformation or the like, the seal member 5 is pressed against the heat storage body 4 through the diaphragm 30 and the diaphragm 30 absorbs this deformation. It can be brought into close contact with the

Note that excessive movement due to deformation is prevented by the holder 10b coming into contact with the stopper 32.
0b is slightly displaced within a range that maintains airtightness and maintains overall stability.

FIG. 6 shows another embodiment, in which the stopper 32 is
It is provided with a large number of grooves 35.

In this way, the high pressure air in the annular passage 9 becomes /'tL3
5 and is sufficiently transmitted to the separate chamber 36 between the diaphragm 30 and the diaphragm 30. At the same time, the recirculation of the low-temperature air is improved, and it is possible to prevent the diaphragm 30 from collapsing due to the high-temperature exhaust gas.

In the embodiment shown in FIG. 7, a heat insulating wall 37 is provided between the exhaust passage 3 and the diaphragm 300 to prevent high-temperature gas from acting directly on the diaphragm 30.

In the embodiment of FIG. 8, the diaphragm 30 is exposed to high temperatures on both sides.
In order to prevent the partition part 31 from sagging, this part is actively cooled with compressed air.
The compressor 20 is installed in the housing 1 near the partition 31 of the
A passage 39 is formed to guide a portion of the air discharged from the pipe, and cool air is jetted out through a nozzle 38.

Note that 3T is a heat insulating wall provided on the inside (high temperature side) of the partition portion 31.

In FIG. 9, instead of forming the diaphragm 30 in a dish shape, a diaphragm 30c is provided whose tip end has a U-shaped cross section by drawing.

The diaphragm 30c has good workability and is easy to assemble.

As explained above, this invention interposes an elastic diaphragm between the conventionally fixed sealing member and the engine housing, so the sealing member always remains in close contact with the heat storage body despite the deformation of the housing. , prevents leakage of exhaust gas and compressed air, and maintains a good sealing condition.

Since there is no gas leakage, the contact pressure of the seal member with respect to the heat storage body in the housing is always approximately constant as long as the discharge pressure of the compressor is constant, and fluctuations in the driving torque of the heat storage body can be suppressed.

[Brief explanation of drawings]

Figure 1 is an overall sectional view of a conventional rotary regenerative heat exchanger;
The figure is a sectional view of the main part. Figure 3 is a sectional view of the first embodiment of the present invention, and Figure 4 is B-
B sectional view and FIG. 5 are perspective views of the diaphragm, and FIGS. 6 to 9 are sectional views of second to fifth embodiments of the present invention, respectively. 2... Intake passage, 3... Exhaust passage, 4... Heat storage body,... Seal member, 6... Pressing side seal member, 1o
b Fixed holder, 30... diaphragm, 32... stopper.

Claims (1)

[Scope of utility model registration request] A honeycomb-shaped heat storage body is provided so as to be freely rotatable astride the intake passage and the exhaust passage, and a seal member is provided that slides on both rotating surfaces of the heat storage body, and compressed air pressure is applied to the seal member on one side to make contact between the seal members. In a rotary regenerative heat exchanger designed to maintain pressure, the seal member on the other side is fixed to the engine housing via a ring-shaped elastic member having a substantially U-shaped cross section, and the seal member is attached to the engine housing side. A sealing device for a rotary regenerative heat exchanger, characterized in that a stopper is provided to prevent excessive displacement of the rotary heat exchanger.