JPS58214792A - Rotary heat accumulating type heat exchanger - Google Patents

Abstract

PURPOSE:To protect an elastic body while preventing a core from being damaged due to the heat insulating effect of a plastic layer by a method wherein a plastic layer with further excellent heat resistance is laid between the elastic body and the core. CONSTITUTION:A plastic layer 20 with excellent heat resistance is formed along the periphery of a core 1 and an elastic body 22 is laid between the core 1 and a ring gear 3 through the intermediary of the plastic layer 20, therefore even if the ambient temperature along the periphery of the core 1 rises up to nearly 400 deg.C, the heat value conducted to the elastic body 22 is reduced by the heat insulating effect of the plastic layer 20 restraining the temperature rise of the elastic body 20 restraining the temperature rise of the elastic body 22 and extending the service life of said elastic body 22. On the other hand, the ventilating holes 23 pierced on the border of the elastic body 22 and the plastic layer 20 effectively accelerate the evaporation of a rubber hardener in the forming process providing said elastic body 22 and plastic layer 20 around said holes 23 with cooling effect due to the air on the low temperature atmospheric side passing through said ventilating holes 23.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary heat storage type heat exchanger, and in particular, the elastic body provided between the no-nikum-shaped core constituting the rotary heat storage body and the ring gear of the drive device deteriorates in a high-temperature atmosphere. It is designed to prevent this from happening.

Figure 1 shows an example of a conventional rotary regenerative heat exchanger (see Automotive Engineering Complete Book, Volume G, Chapter 7, Section 3).

Here, / is a cylindrical heat storage body (hereinafter referred to as core), and a large number of flow channels /B are configured in a no-nikum shape in the axis /A direction of core /, and on the outer periphery of core / is elastic body 2
A ring gear 3 is mounted concentrically through the ring gear 3, and the ring gear 3 is driven by a drive device (not shown) to rotate the core around the axis A. Good work! 6 and 7 are inflow and outflow passages for relatively low-temperature air compressed by a compressor (not shown), and 7 are inflow and outflow passages for high-temperature gas from the gas turbine. A seal device is provided to prevent mixing with the fluid flowing on the high temperature side, and a ring gear V9 is provided to protect the ring gear 3 and the elastic body from the high temperature side. These sealing devices are provided between the The tool 9 is configured to slide on sliding surfaces provided on both sides of the core at the respective positions. In addition,/
/ is an inflow passage and an outflow passage! This is a sealing device that separates the

In the rotary regenerative heat exchanger configured in this way,
When the high-temperature fluid is led from the inflow passage g to the outflow passage 7 through the flow path B of the rotating core, the core is heated, and this heated portion of the core is connected to the inflow passage g and the outflow passage. When the passage j has rotated to the side n where it is provided, the intense heat stored in the core heats the low-temperature fluid passing through the passage /B.

By repeating such actions, heat exchange is performed between the high temperature fluid and the low temperature fluid.

Figure 2 shows the configuration of the rotating body in such a rotary regenerative heat exchanger. In this example, the elastic body 2 is made of rubber, such as an elastomer such as silicone rubber, and is formed with a J-shaped groove. Core/and ring gear 3 through body
This structure connects the core to the core to buffer the impact directly applied to the core during sudden acceleration or deceleration of the engine, thereby preventing damage to the core.

However, such conventional rotary heat exchangers have a structure in which the elastic body is directly attached along the outer periphery of the core, which is exposed to a high-temperature atmosphere. As the pressure at the outlet of the compressor increases and the temperature of the combustion gas supplied to the turbine increases, the overall temperature of the atmosphere in which the core is placed increases, making it difficult to maintain heat resistance. However, the elastic body deteriorates.

In other words, taking the case of automobile gas turbine engines as an example, in order to increase cycle efficiency, the maximum cycle temperature is being raised to 7,300°C or higher in various countries, and in such cases, the temperature at the heat exchanger inlet is increased. The temperature of the combustion gas of
It becomes quite high at θO°C to 2jθ°C. On the other hand, the heat-resistant temperature of silicone rubber-based heat-resistant rubber is 2 to 30 minutes.
θ℃, and the temperature near the joint between the core and the elastic body is 900℃ or more, so the elastic body λ deteriorates due to heat, and there are plastics that have even better heat resistance. Such plastics have poor elasticity, and in order to be used as such an elastic body, the core/ring gear 3
It has the disadvantage that it cannot absorb the difference in thermal expansion between the two and the driving impact force.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, further interpose a plastic layer with excellent heat resistance between the elastic body and the core,
The insulation effect of this plastic layer! :9 An object of the present invention is to provide a rotary regenerative heat exchanger capable of protecting an elastic body and preventing damage to a core.

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

FIG. 3 shows an embodiment of the present invention, where θ is the core/
It is a heat-resistant plastic layer provided along the outer circumferential surface of the plastic layer.
For example, a casting mold corresponding to the outside diameter is provided, and this mold is filled with a heat-resistant or plastic molding material, which is then integrated with Elicor to form two bonded plastic layers. Furthermore, the axis of the core/
A/Gugya 3 is arranged on the outer periphery of the plastic layer 20 mentioned above so that it is concentric with A, and the inner periphery of the ring gear 3 and the plastic layer! By pouring the elastic body 22 such as silicone rubber between the outer peripheral surface of the ring gear 32 and the outer peripheral surface of the ring gear 32, the elastic body 22. A rotating heat storage body can be constructed by integrating the plastic layer 20 and the back core.

In addition, in this precise molding step, depending on the type of rubber or plastic, a primer application process for adhesion and a heat treatment for curing the rubber are required. Further, in this example, a through hole 23 is provided near the boundary between the elastic body 22 and the plastic layer 20, and this through hole 23 effectively promotes the release of the rubber curing agent in the molding process described in -. Not only this, but also the effect of cooling the elastic body 22 and the plastic layer θ in the vicinity of the hole 23 can be obtained by allowing air from the low-temperature atmosphere side to flow through the through hole 23.

FIG. 9 shows another embodiment of the invention in which the plastic layer 20 has equally spaced radial slits 2. In addition, a toothed shape θA that meshes the shape of the outer peripheral part of the plastic layer θ and the shape of the inner peripheral part of the elastic body 22 with each other.
Process and form into 2 pieces A. For other configurations lol
f, same as the example in Figure 3. In the rotating heat storage body configured in this way, by providing the slits in the plastic layer 20, even if the core deforms due to thermal stress, the deformation is absorbed by the 241iC. Since it is not constrained, damage to the core can be prevented.

In addition, ceramic cores usually shrink as the temperature rises within a certain temperature range, such as LAS.
(! J thium aluminum silicate), etc., and when setting the gap between the slits, the coefficient of thermal expansion of the core material and the plastic material must be considered in advance. It is necessary to keep it.

Furthermore, the plastic layer 2o and the elastic body 22 have a tooth pattern 2.
Since θA machining J and 2A are formed in a shape that meshes with each other, when torque is transmitted from the ring gear 3 to the plastic layer -0 via the elastic body n, the elastic body M and the plastic layer 2θ are simply connected. Not only the adhesive strength between the teeth but also the tooth shape 20
There is a tangential communication between A and 2.2 people. Therefore, it is possible to prevent the boundary layer between the elastic body 22 and the plastic layer 2° from slipping and peeling due to torque fluctuations.

No.! In addition to the example shown in FIG. 9, the figure shows the ring gear 3 with the elastic body 22 attached to the core with the plastic layer attached.
It can be attached and detached freely. Therefore, in this example, a retainer portion -0B is provided in the plastic layer λO in order to prevent the ring gear 3 and the elastic body n from coming off in the axial direction. Further, although not shown in the drawings, for example, a presser member or the like may be provided to prevent the retainer portion 20B from separating to the side where the retainer portion 20B is not provided.

Note that in order to make the connection between the elastic body 22 and the plastic layer 2o, that is, between the tooth mold 2.2 and the 2oA, detachable, the elastic body 2. ? It is sufficient to apply a θAK mold release agent to the tooth mold in advance during molding, and the advantage of forming the tooth mold in this way is that the two can be easily removed in the axial direction.

As explained above, according to the present invention, a highly heat-resistant plastic layer is formed along the outer peripheral surface of the core, and an elastic body is interposed between the plastic layer and the plastic layer. Since the rotary heat storage body is constructed using a rotating heat storage body, even if the temperature near the outer periphery of the core reaches a high temperature close to θθ℃, the amount of heat conducted to the elastic body is reduced due to the heat insulating effect of the plastic layer. It is possible to suppress the rise in temperature of the elastic body and extend the useful life of the elastic body.

Additionally, if the elastic body is provided with slits that absorb the deformation of the core in the radial direction, it is possible to prevent the core from being damaged due to thermal stress. By forming it into a mold, it is possible to prevent slipping and peeling at these bonding surfaces. Furthermore,
If the elastic body and ring gear and the core with the plastic layer can be attached and detached using the tooth-shaped interface, it will be easy to replace or repair the core spear/guya. Helps save money.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the configuration of a conventional rotary regenerative heat exchanger, FIG. 2 is a partial plan view showing an example of the configuration of the rotary regenerator, and FIG. 3 is a rotary regenerative heat exchanger of the present invention. FIG. 9 is a partial plan view showing an example of the configuration of the rotating heat storage body of the device; FIG. 9 is a partial plan view showing the configuration of the rotating heat storage body according to another embodiment of the present invention;
No.! The figure is a sectional view showing the structure of a rotating heat storage body according to still another embodiment of the present invention. /...Core, /A...Axis center, /B.
...Flow path, C, 2...Elastic body, 3...
・Su/gugya, ri, otsu...inflow passage, evening, 7
...outflow passage, J', 9. /C...Seal device, /θ...Casing, -〇...Plastic layer, θA, C, 2A...Tooth shape, 20B
... Retainer part, 23 ... Through hole, 24
t...slit. Patent Applicant Nissan Motor Co., Ltd. Agent Patent Attorney Yoshi Tani - Hah

Claims (1)

[Scope of Claims] 1) A flow path parallel to the axis is formed in a cylindrical honeycomb-shaped core, and a ring gear is attached to the outer peripheral surface of the core concentrically with the axis via an elastic body, In the rotary heat storage type heat exchanger having a rotary heat storage body for rotationally driving the core around the axis in the ring gear, an annular layer made of heat-resistant plastic is provided between the outer peripheral surface of the core and the elastic body. A rotating regenerative heat exchanger characterized by: 2. In the rotary regenerative heat exchanger according to claim 1, the annular layer made of heat-resistant plastic is distributed at equal positions in the circumferential direction from the outer circumferential surface of the core to the inner circumferential surface of the elastic body. A rotary regenerative heat exchanger characterized by having a slit. 3) The rotary regenerative heat exchanger according to claim 1 or 2, wherein the annular layer made of heat-resistant plastic and the elastic body each have a tooth-shaped boundary layer. Rotating regenerative heat exchanger.