JPH058258U - Rotary heat storage type heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent damage to the outer peripheral surface of the core in the portion to which the heat resistant rubber is adhered and to improve reliability. [Structure] A disk-shaped core 4 and a ring gear 6 each having a ventilation passage formed of a large number of pores 5 penetrating from one surface side to the other surface inside.
After the heat-resistant rubber 11 interposed between the core 4 and the core 4 is filled with a mucous rubber before vulcanization, the gap between the outer peripheral surface of the core 4 and the inner peripheral surface of the ring gear 6 is filled. Heat-resistant rubber 11 made by heating from both front and rear sides with pressure
Has a compressive residual stress f.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary heat storage type heat exchanger that stores heat of exhaust gas in a high temperature state discharged from a gas turbine or the like to heat intake air in a low temperature state.

[0002]

[Prior Art]

 Generally, in a turbine engine, as shown in FIG. 3, exhaust gas in a high temperature state is supplied from a first passage 1 as a suction passage for supplying combustion air in a low temperature state to a combustor of a turbine (not shown) and the combustor. It is known that a second passage 2 is provided as an exhaust passage for discharging, and a disk-shaped core 4 of a rotary heat storage type heat exchanger 3 is disposed in both passages 1 and 2.

As shown in the schematic front view of FIG. 4, the conventional rotary regenerative heat exchanger 3 has a heat-resistant cushioning material on the outer peripheral surface of a core 4 formed of a ceramic material in a thick disk shape. The ring gear 6 is provided via the heat resistant rubber 7. Further, as shown in FIG. 5 as an enlarged cross-sectional view taken along the line AA in FIG. 4, the core 4 is provided with a large number of pores 5 penetrating from one surface side to the other surface inside thereof. In No. 5, a honeycomb matrix-like ventilation passage is formed.

In this rotary heat storage type heat exchanger 3, the drive gear 8 meshed with the ring gear 6 causes the core 4 together with the ring gear 6 to move in the first passage 1 and the second passage 2 at a relatively low speed. Is rotated across. In addition, in the second passage 2, when the exhaust gas in the high temperature state in the second passage 2 flows in each of the small pores 5 of a part of the core 4, the inside of the fine pores 5 in the flowed portion. The heat is recovered. On the other hand, in the first passage 1, when a part of the core 4 passing through the second passage 2 crosses the inside of the first passage 1, the exhaust gas whose heat is stored and recovered in the second passage 2 Is radiated to the low temperature air in the first passage 1, and the air in the first passage 1 is heated by this heat radiation.

By the way, the heat-resistant rubber 7 in the conventional rotary heat storage type heat exchanger 3 has a viscous, non-vulcanized rubber in the gap between the outer peripheral surface of the core 4 and the inner peripheral surface of the ring gear 6. It is filled and then simply heated to complete the vulcanization.

[0006]

[Problems to be solved by the device]

 Therefore, in the heat storage type heat exchanger 3 having the conventional structure described above, the heat-resistant rubber 7 interposed between the core 4 and the ring gear 6 is vulcanized by nature due to the nature of the rubber. After that, volume contraction occurs, and as shown by reference numeral 9 in FIG. 5, this contraction forms recesses on the front and rear surfaces, and a tensile stress F is generated inside the heat resistant rubber 7 toward the outer side in the radial direction of the core 4. To do. The outer peripheral portion of the core 4, which is formed in a honeycomb shape with a wall thickness of about 0.1 mm and is bonded to the heat resistant rubber 7, may be peeled off and damaged by the tensile stress F in some cases. There was a problem in terms of sex.

The present invention has been made in view of the above problems, and an object thereof is to prevent damage to the outer peripheral surface of the core in a portion where the heat resistant rubber is adhered and improve reliability. The object is to provide a rotating heat storage type heat exchanger having a structure.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a rotary heat storage type heat exchanger according to the present invention has a ring-shaped gear and a disk-shaped core having an air passage having a large number of pores penetrating from one side to the other side. After the heat-resistant rubber is mounted, after filling the gap between the outer peripheral surface of the core and the inner peripheral surface of the ring gear with the viscous rubber before vulcanization, the front and rear surface sides of the core The heat-resistant rubber after being interposed is given a compressive residual stress by being heated with pressure from the above.

[0009]

[Action]

 According to this structure, the heat-resistant rubber is pressed to have a compressive residual stress when it is vulcanized, so that volumetric contraction occurs after vulcanization and pulling toward the outer side in the radial direction of the core. Even if stress is generated, it cancels out with the compressive residual stress. Moreover, after the offsetting, the compressive residual stress also becomes small and almost disappears. Therefore, the stress exerted on the contact surface between the core and the heat-resistant rubber is also small, so that peeling on the outer peripheral surface of the core can be eliminated to protect the core.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part showing an embodiment of the rotary heat storage type heat exchanger according to the present invention, which corresponds to the part of the conventional structure shown in FIG. Further, in FIG. 1, the same reference numerals as those in FIGS. 3 to 5 indicate the same components as those in FIGS. 3 to 5.

In FIG. 1, a rotary heat storage type heat exchanger 10 is arranged in the first passage 1 and the second passage 2 instead of the conventional rotary heat storage type heat exchanger 3 shown in FIG. It is a thing. A ring gear 6 is provided via a heat resistant rubber 11 on the outer peripheral surface of a disk-shaped core 4 in which an air passage made up of a large number of pores 5 penetrating from one surface side to the other surface side is formed inside. The drive gear 8 meshed with the ring gear 6 causes the core 4 to alternately cross the first passage 1 through which the low temperature gas flows and the second passage 2 through which the high temperature gas flows. Driven to rotate. At this time, the heat of the high temperature gas flowing in the second passage 2 is stored in the core 4, and the heat can heat the low temperature gas flowing in the first passage 1.

In addition, in the rotary heat storage type heat exchanger 10, the heat-resistant rubber 11 has a small compressive residual stress f acting on both the front surface (a) and the rear surface (b) of the core 4 in FIG. Has been held. The compressive residual stress f is added during the manufacturing stage in which the compressive residual stress f is interposed between the core 4 and the ring gear 6.

FIG. 2 shows an example of a method of making the heat resistant rubber 11 interposed between the core 4 and the ring gear 6 by giving a compressive residual stress f, which will be described below. .. First, a mucous rubber is prepared, and this rubber is filled in the gap between the outer peripheral surface 4a of the core 4 and the inner peripheral surface 6a of the ring gear 6. At the same time, the rubber before vulcanization is vulcanized by heating it while applying pressure P from the front and rear sides (a) and (b) of the core 4 with the pressure members 21 and 22. FIG. 2 shows this state. It should be noted that the heating at this time may be performed simultaneously by the pressure members 21 and 22 or by using another means. After this vulcanization, the pressure members 21 and 22 are removed. Then, the heat-resistant rubber 11 also undergoes volume contraction after vulcanization, but the pressure P is applied to the inside of the heat-resistant rubber 11 from the front and rear surfaces (a) and (b) at the time of molding, so that the compressive residual stress f Since the compressive residual stress f and the tensile stress F due to volume contraction cancel each other out, the tensile force F acting in the direction of peeling the outer peripheral surface of the core 4, that is, the radial direction disappears, and the core 4 Only a small amount of compressive residual stress f acting on the front and rear surfaces (a) and (b) remains.

Therefore, according to the rotary heat storage type heat exchanger 10 of this embodiment, the tensile stress from the heat-resistant rubber 11 side that peels and damages the outer peripheral surface 4a of the core 4 which has been a problem in the conventional structure. Can be eliminated.

[0015]

[Effect of the device]

 As explained above, according to the rotary heat storage type heat exchanger of the present invention, since the heat resistant rubber is pressurized to have a compressive residual stress when the heat resistant rubber is vulcanized, the vulcanization after vulcanization is performed. Even if the volume shrinkage occurs, this cancels out with the compressive residual stress, and after canceling, the compressive residual stress also becomes small and can be almost eliminated. Therefore, the heat-resistant rubber, which has been a problem in the conventional structure, exerts a slight reaction on the contact surface with the core, so the outer peripheral surface of the core will not be peeled off and damaged, and reliability will be improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a rotary heat storage type heat exchanger according to the present invention.

FIG. 2 is a view for explaining a method of forming a heat resistant rubber 7 having a compressive residual stress in the heat exchanger shown in FIG.

FIG. 3 is an overall schematic configuration sectional view showing a general usage mode of a rotary heat storage type heat exchanger together with a conventional rotary heat storage type heat exchanger.

FIG. 4 is a front view of the above heat exchanger shown in FIG. 3.

5 is an enlarged cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 First Passage (Intake Passage) 2 Second Passage (Exhaust Passage) 4 Core 5 Pore 6 Ring Gear 8 Drive Gear 10 Rotational Storage Heat Exchanger 11 Heat Resistant Rubber

Claims (1)

[Claims for utility model registration] [Claim 1] A ring gear with a heat resistant rubber on the outer peripheral surface of a disk-shaped core in which ventilation passages are formed with a large number of pores penetrating from one surface side to the other surface side. Is provided, and the drive gear meshed with the ring gear drives the core to rotate alternately across the first passage through which the gas in the low temperature state flows and the second passage through which the gas in the high temperature state flows. , The second
In the rotary heat storage type heat exchanger in which the heat of the high temperature gas flowing in the passage of the core is accumulated in the core and the low temperature gas flowing in the first passage is heated by this heat, the heat resistant rubber is the outer periphery of the core. The gap between the surface and the inner peripheral surface of the ring gear is filled with a viscous rubber before vulcanization, and then heated by applying pressure from both front and rear sides of the core. A rotary heat storage type heat exchanger, characterized in that the subsequent heat-resistant rubber is given a compressive residual stress.