JPH054597B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary regenerative heat exchanger, and in particular to a rotary regenerative heat exchanger, in which a sealing member is pressed against the surface of a core due to the pressure difference between two fluids participating in heat exchange, thereby transferring fluid from a high pressure side to a low pressure side. The present invention aims to improve the sealing function of a sealing device designed to prevent leakage of water.

Figure 1 shows an example of a conventional rotary regenerative heat exchanger (see Automotive Engineering Complete Book, Volume 6, Chapter 7, Section 3, published by Sankaido Co., Ltd., January 1980), where 1 is It is a heat storage body (hereinafter referred to as a core) having a cylindrical shape, and a large number of channels 1A are formed in a honeycomb shape in the axis X direction of the core 1.

A ring gear 2 is integrally attached along the outer peripheral surface of the core 1, and by driving the ring gear 2 by a drive device (not shown),
Rotate the core 1 around the axis X. 3 is a gas passage through which high-temperature gas from a gas turbine (not shown) is guided, and the high-temperature gas guided into the gas passage 3 supplies heat to the core 1 when passing through the flow path 1A of the core 1. It is guided to the exhaust passage 4. Reference numeral 5 denotes an air passage through which high-pressure and low-temperature air is guided from a compressor (not shown).
When passing through the passage 1A of the core 1, the core 1 receives heat from the core 1 previously heated by high-temperature gas, is preheated, and is guided to the combustor (not shown) via the passage 6 leading to the combustor inlet.

7A and 7B are seal members that seal between the side of the gas passage 3 and exhaust passage 4 through which high-temperature gas passes and the side of the air passages 5 and 6 through which high-pressure and low-temperature air flows; Spring 8
are biased towards the upper and lower surfaces of the core 1 through the , and are sealed by maintaining sliding contact. Further, 9A and 9B are sealing members provided along the upper and lower surfaces of the core 1 over a half circumference and a full circumference, respectively. By arranging these sealing members 9A and 9B, the ring gear 2 etc. are always kept in a low-temperature atmosphere. maintained within. 10 is a casing of a heat storage device.

Furthermore, in the rotary regenerative heat exchanger configured as described above, a sealing device that presses the sealing member against the core surface by the pressure difference between the two fluids participating in heat exchange may be used, for example, as shown in FIGS. 2A and B. There is something like this. Here, 20 is a space on the high pressure side, through which air compressed by a compressor flows. Further, 21 is a fluid passage on the low pressure side, for example, an exhaust passage from a gas turbine. A thin plate 22 is used as a sealing device between the high pressure side space 20 and the exhaust passage 21. A backup plate 23 is attached to the lower surface of the thin plate 22. are respectively radial slits 2 as shown in Figure 2B.
2A and 23A are provided. These slits 22A and 23A are arranged so that their positions are overlapped and different from each other, and the thin sealing plate 22 and its back-up plate 23, which are overlapped in this way, are bolted to the casing 24 through the spacer 25. 26. Further, the peripheral end 22B of the thin plate 22 is kept in contact with the holder 28 of the seal member (hereinafter referred to as a seal sliding contact member) 27.

However, in the sealing device configured in this way, the effective pressure distribution for pressing the seal sliding contact member 27 against the sliding surface 1B of the core 1 from the high pressure space 20 side via the holder 28 is as shown by arrow group B. However, in reality, due to the couple force caused by the opposing flow of two fluids acting on the core 1, the axis X of the core 1 tends to be tilted to the right in Fig. 2A. As a result, the distribution of the reaction force generated on the sliding surface 1B is shown by arrow group C. That is, according to this example, since the holder 28 and the thin plate 22 are in a slidable line contact, the pressure receiving area on the sliding surface 1B is significantly biased toward the outside of the core 1, and the torque becomes unstable. This not only causes fluctuations in the amount of water, but also causes leakage. Furthermore, since the slits 22A and 23A are provided in the thin plate 22 and the backup plate 23, there is a lot of leakage even though the slits are shifted and overlapped, and such leakage accounts for up to 20% of the leakage of the entire device. There was a problem of overlapping.

The object of the present invention is to eliminate the above-mentioned drawbacks, to provide a rotary regenerative heat exchanger in which the seal sliding contact member always presses against the sliding surface of the core in a stable state, has a simple structure, and can control gas leakage. It is about providing.

In order to achieve such an object, the present invention has a sealing device that is in sliding contact with both sides of a rotating cylindrical core and seals between two fluids that participate in heat exchange, and the sealing device includes a seal that is in sliding contact with the core. A rotary heat storage type comprising a member, a holder for the sealing member, and a sealing plate provided between the holder and the casing, and the sealing member is pressed against the core by a pressure difference between the two fluids. In the heat exchanger, the sealing plate is formed of a flexible, annular, flat foil-like membrane, and the outer end of the annular, flat foil-like membrane attached to the casing is connected to the outer end of the sealing plate. The elastic body is sandwiched between a foil-shaped elastic body and a pressure transmitting surface of the holder together with a spacer provided with a gap therebetween, and the elastic body is brought into surface contact with the outer end of the membrane body. The outer end portion is pressed against the pressure receiving and transmitting surface by the elastic force of the outer end portion.

The present invention will be explained in detail below based on the drawings.

FIG. 3 shows an embodiment of the invention. Here, 3
3 is a membrane holder attached to the casing 24 along the circumference of the fluid duct 34. Therefore, the inner peripheral end 4 of the foil-like film body 42 having an annular flat plate shape
2A is clamped and fixed between the membrane holder 33 and the membrane fixing plate 35, and a pressure receiving plate 43 as a pressure receiving and transmitting surface having a predetermined pressure receiving width L is attached to the upper surface of the holder 36 of the sliding member 27 at the outer peripheral end. The outer peripheral end 42 of the membrane body 42 is attached between the pressure receiving plate 43 and the foil-like elastic body 44 having approximately the same width.
A retainer 3 is provided above the pressure receiving plate 43 and the elastic body 44 so as to sandwich the pressure receiving plate 43 and the elastic body 44.
7 and fixed to the holder 36 with bolts 45.

In this case, the outer peripheral end 42 of the membrane body 42
B is located near the center of the width of the pressure receiving plate 43 and the elastic body 44, and the bolt 45 fastening portion between the pressure receiving plate 43 and the elastic body 44 has a thickness approximately the same as that of the membrane body 42. By clamping the spacer 46, the degree of freedom of the end portion 42B of the membrane body 42 to slide in the horizontal direction is not restricted.

That is, by doing so, not only can deformation of the membrane body 42 due to the influence of thermal expansion be released at the end portion 42B, but also the end portion 42B of the membrane body 42 can be connected to the pressure receiving plate 43 and the elastic body 44.
By overlapping each other, the leakage path is bypassed by the amount of overlap, which has the effect of controlling leakage.

Furthermore, in the heat exchanger configured as described above, since the membrane body 42 has flexibility, the pressure difference can be uniformly distributed through the pressure receiving width L formed by the holder 36 and the pressure receiving plate 43. The pressure is transmitted to the contact member 27, and the outer peripheral end 42B of the membrane body 42 is held between the pressure receiving plate 43 and the pressure receiving plate 43 through the elasticity of the foil-like elastic body 44, and
Since it is not necessary to provide a slit in the membrane body 42 as in the conventional case, a sufficient sealing effect can be obtained with minimal leakage.

As described above, the present invention includes a sealing device that is in sliding contact with both surfaces of a rotating cylindrical core to seal between two fluids that participate in heat exchange, and the sealing device is in sliding contact with the core. A rotary heat storage device comprising a sealing member, a holder for the sealing member, and a sealing plate provided between the holder and a casing, and configured to press the sealing member against the core due to a pressure difference between the two fluids. In the type heat exchanger,
The sealing plate is formed of a highly flexible annular flat foil-like membrane, and a gap is provided between the outer end of the annular flat foil membrane attached to the casing and the outer end thereof. The elastic body is sandwiched between a foil-shaped elastic body and a pressure transmitting surface of the holder together with a spacer provided, and the elastic body is brought into surface contact with the outer end of the membrane body while its elastic force is Since the outer end portion is pressed against the pressure receiving and transmitting surface, the pressure difference of the fluid is not only transmitted as a uniform pressing force to the pressure transmitting surface of the seal sliding member holder via the membrane body, but also Since the holding structure at the outer peripheral edge of the membrane body does not restrict the degree of freedom in the plane direction, leakage from the entire sealing device can be controlled through this membrane body regardless of the deformation of the membrane body. .

Furthermore, the leakage path at the outer peripheral end of the membrane bypasses the two overlapping pressing surfaces, thereby increasing the leakage control effect in this area.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view schematically showing an example of the configuration of a conventional rotary regenerative heat exchanger, Figure 2A is a cross-sectional view showing an example of the configuration of its sealing device, and Figure 2B is Figure 2A. FIG. 3 is a cross-sectional view showing the structure of a sealing device according to another embodiment of the present invention. 1... Core, 1A... Channel, 1B... Sliding surface,
2...Ring gear, 3...Gas passage, 4...Exhaust passage, 5, 6...Air passage, 7A, 7B, 9A,
9B... Seal member, 8... Spring, 10...
...Casing, 20...Space, 21...Exhaust passage, 22...Thin plate, 23...Plate, 22A,
23A...slit, 22B...peripheral end, 24...
...Casing, 25...Spacer, 26...Bolt, 27...Sealing member, 28...Holder, 33
...Membrane body holder, 34...Duct, 35...Membrane body fixing plate, 36...Holder, 37...Retainer, 4
2... Membrane body, 42B... End, 43... Pressure receiving plate, 44... Elastic body, 45... Bolt, 46...
…Spacer.

Claims (1)

[Claims] 1. A sealing device that is in sliding contact with both sides of a rotating cylindrical core and seals between two fluids that participate in heat exchange, and the sealing device includes a sealing member that is in sliding contact with the core, a holder for the sealing member, and the holder. and a sealing plate provided between the sealing plate and the casing, in which the sealing member is pressed against the core by a pressure difference between the two fluids. It is formed of a highly flexible, annular, flat foil-like membrane body, and a gap is provided between the outer end of the annular, flat foil-like membrane attached to the casing, and the outer end thereof. The elastic body is sandwiched between a foil-shaped elastic body and a pressure transmitting surface of the holder together with a spacer, and while the elastic body is brought into surface contact with the outer end of the membrane body, its elastic force is applied to the outer end. A rotary regenerative heat exchanger, characterized in that: is pressed against the pressure receiving and transmitting surface.