JPH0712765U - Sealing device for rotary heat storage type heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a sealing device having a high sealing property and a relatively simple structure. [Structure] The sealing device 1 is composed of a heat storage core side seal plate 11 and a fixed part side seal plate 12, and an inner peripheral edge portion where both seal plates overlap is sandwiched by a support plate 17 so as to be slidable with respect to each other. [Effect] Sealability is better than that of hinge type seal,
Moreover, it is possible to obtain a flexible sealing device conforming to the bellows type with a simple structure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a sealing device that is in sliding contact with a heat storage core in a rotary heat storage heat exchanger.

[0002]

[Prior art]

 In the rotary heat storage type heat exchange device, the high temperature gas passage and the low temperature gas passage are arranged close to each other, and a disk-shaped heat storage core is arranged so as to span both the high temperature gas passage and the low temperature gas passage. The core is driven to rotate and the low-temperature gas is brought into contact with the heat storage core heated by the high-temperature gas to perform heat exchange to heat the low-temperature gas, which is used, for example, in a gas turbine engine.

FIG. 11 is a schematic view of a rotary heat storage type heat exchanger portion in a gas turbine engine. As shown in the figure, a sealing device 1 in contact with a heat storage core is provided to prevent high pressure air from leaking to an exhaust gas side. Is done. 2 is a heat storage core, 3 is a housing, 4 is a flow path of exhaust gas, 5 is a flow path of high-pressure air, and the sealing device 1 is a ring shape corresponding to the shape of the housing 3 or the flow paths 4 and 5, or a similar one. The heat storage core 2 is provided on both sides and is in sliding contact with the heat storage core 2. The relatively low pressure exhaust gas corresponds to the high temperature gas, and the high pressure air compressed by the compressor corresponds to the low temperature gas.

Since such a heat exchange system is used over a wide temperature range from room temperature when the engine is stopped to about 900 ° C. at the maximum output, the sealing device causes thermal expansion and expansion of the members constituting the system. It is necessary to absorb thermal deformation and always exhibit good sealing properties.

FIG. 12 shows an example of a general sealing device. FIG. 12 (a) shows a hinge type seal in which one end of a seal plate 1a is fixed to a seal shoe 1b and the other end slides on a housing or a retainer. Figure (b) shows a bellows type seal in which the seal plates 1c are stacked in a bellows shape. The seal plates 1a and 1c have a conical peripheral surface and have a large rigidity, and as they are, lack the flexibility necessary to absorb the deformation of the system constituent members and obtain good sealability. Since it becomes difficult, in the case of a hinge type seal, a plurality of slits 1d are often provided radially in the seal plate 1a. Also, the bellows type seal is less flexible than the hinge type because both ends of each seal plate 1c are constrained, but flexibility is secured as a whole by stacking the seal plates 1c in multiple stages. It is composed.

However, in the hinge type seal, at the time of starting when the pressure on the high pressure side is low, the tip of the seal plate 1a is not sufficiently pressed against the housing and the retainer to cause leakage, and the slit provided in the seal plate 1a during normal operation. Since the leakage occurs from 1d, there is a problem that the sealing property is easily damaged. Further, although the bellows type seal has good sealing property, it has a problem that the structure is complicated and the manufacturing cost is high.

[0007]

[Problems to be solved by the device]

 The present invention has been made in view of such problems, and an object thereof is to obtain a sealing device having a high sealing property and a relatively simple structure.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a ring shape arranged on the heat storage core side or a heat storage core side seal plate of a shape similar to this and a ring shape arranged on the fixed part side of the housing or the like. By combining a fixed side seal plate having a shape conforming to the above, the inner peripheral edges where both seal plates overlap are sandwiched by a support plate so that they can slide relative to each other.

In addition, each of the heat storage core side and the fixed side seal plates has a multi-layer structure, and each layer of the seal plate has a slit transverse to the longitudinal direction in which slits in an upper layer and a slit in a lower layer are alternately arranged. A plurality of them are formed at different positions so that they do not overlap. Further, a plate spring may be provided for each slit so as to contact the surface of each layer on the high pressure side of the heat storage core side seal plate and the fixed side seal plate to cover the slit of each high pressure side layer. Coil springs may be provided so as to come into contact with the surfaces of the layers on the high-pressure side to bring the layers of the heat storage core side seal plate into close contact with each other and the layers of the fixed part side seal plate to come into close contact with each other.

[0010]

[Action]

 The seal plates on the heat storage core side and the fixed part side can be structured so that the outer peripheral edge is constrained, and the inner peripheral edge where both seal plates overlap is sandwiched by the support plates, so the sealing performance is a hinge type. It is better than a seal, and since the inner peripheral edge of each seal plate can slide without being constrained in the circumferential and radial directions, it is possible to use a bellows type without using a multi-stage structure like the ordinary bellows type. Flexibility according to

In addition, the seal plate on the heat storage core side and the seal plate on the fixed portion side have a multi-layer structure, and the slits are formed at positions that do not overlap each other, so that the seal has flexibility and less leakage from the slits. The device is obtained. Also, by providing a plate-shaped spring in each slit on the high-pressure side surface, leakage from the slit is reduced, and by making the coil-shaped springs closely contact each seal plate, even if the pressure on the high-pressure side is low, the seal leaks. Is less likely to occur.

Next, the illustrated embodiment will be described. The same parts as those in FIG. 11 are designated by the same reference numerals.

[0013]

First Embodiment FIG. 1 is a cross-sectional view of a first embodiment corresponding to claim 1, in which a sealing device 1 includes a sealing plate 11 on a heat storage core side, a sealing plate 12 on a fixed portion side, a shoe 13 and It is composed of retainers 14 and the like. Reinforcing material 15 is fixed to the outer peripheral edge of the seal plate 11 and is in sliding contact with the shoe 13, and sealing plate 12 is in contact with the retainer 14 with reinforcing material 16 is fixed to the outer peripheral edge of the seal plate 12. Inner peripheral edge portions of the plates 11 and 12 are inserted into a U-shaped support plate 17 having a flat cross section.

FIG. 2 is an exploded view. Slits 18 are radially formed in the seal plates 11 and 12 at appropriate intervals by, for example, laser processing, and reinforcements 15 and 16 are attached by welding, for example. The support plate 17 is composed of an upper member 17a and a lower member 17b each having a step on the inner surface. The support plates 17 are welded to each other with the inner peripheral edge portions of the seal plates 11 and 12 sandwiched therebetween. The peripheral edge portion is slidable in the circumferential direction and the radial direction within the step portion of the support plate 17.

As shown in FIG. 1, the sealing device 1 of this embodiment is arranged between the heat storage core 2 and the housing 3 such that the inner sides of the stacked sealing plates 11 and 12 are on the high-pressure side. As shown by the arrow, pressure is applied to the seal plate 11 from below and to the seal plate 12 from above. Here, the outer peripheral edge portions of the seal plates 11 and 12 are constrained by the reinforcing members 15 and 16, but the inner peripheral edge portions are slidable inside the support plate 17 and are not constrained. Therefore, the rigidity that prevents deformation of the seal plates 11 and 12 is reduced. For this reason, the seal plates 11 and 12 can be deformed relatively easily according to changes in the pressure or the distance between the heat storage core 2 and the housing 3, and a good sealing property can be obtained.

[0016]

[Embodiment 2] Although the slit 18 in Embodiment 1 has a very narrow width, the respective seal plates 11 and 12 are curved as shown in Fig. 1 due to the pressure on the high pressure side, and when the curvature becomes large. The slit 18 expands and a seal leak occurs from here. 3 and 4 show an embodiment corresponding to claim 2 which prevents this.

That is, the seal plates 11 and 12 have a multi-layer structure composed of an outer plate 11a and an inner plate 11b and an outer plate 12a and an inner plate 12b, respectively, and the slits 19 and 20 of the respective seal plates 11 and 12 are The slits 19 of the outer plate 11a and the inner plate 11b do not overlap with each other, and the slits 20 of the outer plate 12a and the inner plate 12b do not overlap with each other. Therefore, when the seal plates 11 and 12 are curved due to the pressure difference, the seal plates 11 and 12 are pressed against the inner plates 11b and 12b on the high-pressure side and closely contact the outer plates 11a and 12a on the low-pressure side. Even if the slits 19 and 20 widen, seal leakage does not occur and good sealing performance is maintained.

FIGS. 5 and 6 are modified examples of the multi-layer structure. Instead of providing the slits 19 and 20 on the continuous seal plates 11 and 12, the seal plates 11 and 12 are connected to the seal pieces 11c and This is a structure in which the seal pieces 12c are combined. The protrusions 11d and 12d are formed on one side edge of each of the seal pieces 11c and 12c, and the protrusions 11d and 12d are overlapped with the side edges of the adjacent seal pieces 11c and 12c. It is provided in a portion not covered with the strong materials 15 and 16 and the support plate 17.

That is, in this embodiment, the portion corresponding to the slit has a multi-layered structure, and even if the seal plates 11 and 12 are curved and the space between the seal pieces 11c or 12c is widened. Since the protruding portions 11d and 12d are overlapped with the adjacent seal pieces, no gap that would cause seal leakage is generated and good sealing performance is maintained.

[0020]

Third Embodiment This type of sealing device uses the pressure difference between the high pressure side and the low pressure side to ensure adhesion. Therefore, in the initial stage when the pressure difference is small such as at the time of starting, sufficient adhesion cannot be ensured, and a gap may be created partially and seal leakage may occur.Once a gap is created, the pressure difference becomes large. However, the air that has entered between the seal plates of the multi-layer structure cannot be eliminated, and the leakage is further promoted.

FIGS. 7 and 8 show an embodiment corresponding to claim 3 which prevents this, and inside the inner plates 11b and 12b of the respective seal plates 11 and 12 in the embodiment shown in FIGS. 3 and 4, That is, the plate spring 22 is provided on the high pressure side. The plate-shaped spring 22 is formed by bending a rectangular plate spring material into a U-shape, and is selected so as to spread the inner plates 11b and 12b toward the outer plates 11a and 12a. Each of the slits 19 and 20 is arranged. Notches 23 are formed in the inner edge portions of the reinforcing members 15 and 16, respectively, and the plate-shaped spring 22 is positioned with its end edges being held.

This embodiment is configured as described above, and in FIG. 8B, a gap is provided between each member for convenience, but in reality, the pressure difference between the high pressure side and the low pressure side is Even when the size is small, the plate-shaped spring 22 is in close contact with the inner plates 11b and 12b, so that the slits 19 and 20 are closed and no seal leakage occurs. When the pressure difference is large, the inner plates 11b and 12b are pressed against the outer plates 11a and 12a by the pressure difference, so that the slits 19 and 20 are closed and no seal leakage occurs.

[0023]

Fourth Embodiment In the third embodiment described above, since the plate-shaped spring 22 is provided for each slit, the structure is complicated and it is difficult to assemble and disassemble. FIGS. 9 and 10 show an embodiment corresponding to claim 4 which is an improvement thereof, in which a coil-shaped spring 25 is provided on the inner side of the inner plates 11b, 12b of the respective seal plates 11, 12. This coil-shaped spring 22 is continuous in the longitudinal direction of the seal plates 11 and 12, and its outer diameter is selected so as to press the inner plates 11b and 12b against the outer plates 11a and 12a.

Therefore, even when the pressure difference between the high pressure side and the low pressure side is small, the inner plates 11b and 12b are in close contact with the outer plates 11a and 12a, and the slits 19 and 20 are closed, so that no seal leakage occurs. . Further, even if the pressure difference becomes large, the inner plates 11b and 12b and the outer plates 11a and 12a are deformed while being in close contact with each other, so that no seal leakage occurs. Compared with the third embodiment, the number of parts is reduced, and it is easy to assemble and disassemble, which is advantageous in terms of cost.

[0025]

[Effect of device]

 As is clear from the above description, the present invention comprises a seal device including a heat storage core side seal plate and a fixed part side seal plate, and the inner peripheral edge portions where the both seal plates overlap can be slidable with respect to each other. It is sandwiched by support plates. Therefore, it is easy to obtain a sealing device which has better sealability than the hinge type seal and is flexible and conforms to the bellows type while having a simple structure.

Further, each seal plate on the heat storage core side and the fixed part side has a multi-layer structure, and the slits are formed at the positions where the seal plates do not overlap each other, so that there is more flexibility, and moreover A sealing device with less leakage can be obtained. Also, by providing a plate-shaped spring that abuts the high-pressure side surface of each seal plate and covers each slit of the seal plate, it is possible to prevent seal leakage when the pressure difference is small at the time of starting, etc. By using a coiled spring instead of the above, it is possible to obtain a sealing device having a simple structure and good sealing performance.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the embodiment.

3A and 3B are a plan view and a cross-sectional view of a main part of the second embodiment.

FIG. 4 is an exploded perspective view of a main part of the embodiment.

5A and 5B are a plan view and a sectional view of a main part of a modified example of the embodiment.

FIG. 6 is an exploded perspective view of a main part of the modified example.

FIG. 7 is a sectional view of an essential part of the third embodiment.

FIG. 8 is a sectional view taken along line aa and bb of FIG.

FIG. 9 is a sectional view of an essential part of the fourth embodiment.

FIG. 10 is a perspective view of a main part of the embodiment.

FIG. 11 is a general schematic cross-sectional view and a schematic exploded perspective view of a rotary heat storage type heat exchanger in a gas turbine engine.

FIG. 12 is a perspective view and a sectional view of a main part of a conventional sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing device 1a, 2a Annular part 1b, 2b Linear part 2 Heat storage core 3 Housing 4 Exhaust gas flow path 5 High pressure air flow path 11 Heat storage core side seal plate 12 Fixed part side seal plate 11a, 12a Outer plate 11b, 12b In Plates 11c, 12c Seal pieces 11d, 12d Projection part 13 Shoe 14 Retainer 15, 16 Reinforcing material 17 Support plate 18, 19, 20 Slit 22 Plate spring 25 Coil spring

Claims (4)

[Scope of utility model registration request] 1. A disk-shaped heat storage core is arranged so as to straddle both a high temperature gas flow path and a low temperature gas flow path provided in proximity to each other, and the low temperature gas is passed through the heat storage core by rotationally driving the heat storage core. A seal device in a rotary heat storage heat exchanger configured to heat a heat storage core side seal plate having a ring shape or a similar shape arranged on the heat storage core side and a fixed portion side such as a housing. It is characterized in that it is combined with a fixed-portion-side sealing plate having a ring shape or a shape similar to that arranged, and the inner peripheral end edges where both sealing plates overlap are sandwiched by a supporting plate so as to be slidable with respect to each other. Sealing device for rotary heat storage type heat exchanger. 2. The heat storage core side seal plate and the fixed part side seal plate each have a multi-layer structure, and slits transverse to the longitudinal direction are provided in each layer of the seal plate so that the upper and lower slits do not overlap each other. The seal device for a rotary heat storage heat exchanger according to claim 1, wherein a plurality of seal heat-exchanger heat exchangers are formed by shifting them. 3. The rotation according to claim 2, wherein each slit is provided with a plate-shaped spring that abuts the surface of each layer on the high-pressure side of the heat storage core side seal plate and the fixed portion side seal plate and covers the slit of each high-pressure side layer. Sealing device for heat storage type heat exchanger. 4. A coil shape in which the layers of the heat storage core side seal plate and the layers of the fixed part side seal plate are brought into close contact with each other by contacting the surfaces of the layers on the high pressure side of the heat storage core side seal plate and the fixed part side seal plate. The sealing device for a rotary heat storage heat exchanger according to claim 2, wherein a spring is provided.