JP2013050068A - Heat insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow heated vapor to be restrained from being leaked from the joints of respective parts of a heat insulator.SOLUTION: With respect to the heat insulator 5 whose wall is divided into a plurality of parts 5A, 5B, with the parts 5A, 5B being mounted over the turbine 3 (heat emitting device) of a turbocharger 2 so that the radiant heat can be shut off, the joints of the respective parts 5A, 5B are mutually overlapped with a required clearance in between them, with one end 5a of the part 5A placed inside the overlapped joint being bent outward, while the ends of the outside parts 5A, 5B being bent inside to hang over the one end 5b of the part 5B located inside, thus the jointed parts of the parts 5A, 5B constituting a Labyrinth Structure.

Description

  The present invention relates to a heat insulator for shielding radiant heat from a heat generating device and protecting peripheral devices from heat damage.

  Conventionally, some engines such as automobiles are equipped with a turbocharger in order to improve the intake efficiency of the engine. In this type of turbocharger, the energy of exhaust gas discharged from the engine (kinetic energy and thermal energy). ) Is used to rotate the turbine, and the centrifugal compressor is driven by the rotational force to increase the pressure of the intake air and send it to the engine.

  Here, since the high-temperature exhaust gas immediately after being discharged from the engine is guided to the turbine of the turbocharger, the temperature of the turbine rises to a high temperature during the operation of the engine. In order to prevent thermal damage caused by radiant heat on the cable or the like, measures are taken to cover the turbine side of the turbocharger mainly with a heat insulator.

  This type of heat insulator covers a relatively wide area, becomes large, and has a complicated three-dimensional shape. Therefore, considering its assembly workability, it can be divided into multiple parts. It is preferable to attach to the turbocharger.

  However, it is difficult to assemble the heat insulator parts so that they are closely adjacent to each other, and there is also a demand for avoiding the possibility of noise and wear occurring at the mating parts of the heat insulator parts. For this reason, it is usual that a gap is left at the joint portion of each part.

  As prior art document information related to such a heat insulator, there are the following Patent Document 1, Patent Document 2, and the like.

Japanese Utility Model Publication No. 5-11304 Japanese Patent No. 3796910

  However, in the case of an engine such as an automobile, even if there is a gap between the parts of the heat insulator, the hot air rising from this gap is blown away by the running wind, so heat damage to the cables above the gap during running However, immediately after the vehicle stops and the engine stops, high-temperature hot air rising from the gap between the parts of the heat insulator due to the heat soak back phenomenon reaches peripheral devices such as cables. There was a risk of heat damage to the peripheral devices.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to be able to suppress leakage of hot air from a joint portion of each part of a heat insulator.

  The present invention relates to a heat insulator that is divided into a plurality of parts and that can be attached to a heat generating device so as to shield radiant heat. And labyrinth at the matching part of each part by bending the end of the overlapped inner part to the outside and bending the end of the outer part to cover the end of the inner part. The structure is characteristic.

  Thus, in this way, the hot air that is about to leak from the mating part of each part of the heat insulator wraps around the tip of the end part of the inner part of the mating part that warps outside, and then this inner part This is because it is folded back in the opposite direction by the end of the outer part that bends inward so as to cover the end of the part, and is finally guided to the outside by further turning around the tip of the end. The flow shape of the hot air is subjected to passage resistance due to the twisted flow path shape of the labyrinth structure, and the leakage of hot air from the mating portions of the parts of the heat insulator is greatly suppressed.

  Further, in the present invention, it can be applied as a heat insulator that covers at least a turbine as a heat generating device in a turbocharger of an automobile, and is suitable, for example, when a cable or the like is routed above the turbine. .

  According to the heat insulator of the present invention described above, the passage resistance due to the twisted and curved flow path shape of the labyrinth structure configured in the mating part of each part against the hot air that leaks out from the mating part of each divided part Therefore, it is possible to greatly suppress the leakage of hot air from the mating portion of each part, and to prevent thermal damage to peripheral devices due to the leakage of hot air from the mating portion. An excellent effect of being able to do so can be achieved.

It is a perspective view which shows an example of the form which implements this invention. It is sectional drawing of the matching part of each part in the heat insulator of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 and FIG. 2 show an example of an embodiment of the present invention. In the example shown here, a turbine 3 of a turbocharger 2 mounted on an engine 1 of an automobile (and an upstream of an exhaust pipe 4). Part) is illustrated as an example of the heat insulator 5 that covers the heat generating device. The heat insulator 5 is divided into a pair of parts 5A and 5B, and the parts 5A and 5B are fastened to the turbine 3. 6 so that radiant heat from the turbine 3 is shielded by the parts 5A and 5B.

  That is, in the example shown in FIG. 1, the cable 7 (peripheral devices) is routed above the turbocharger 2 so that the cable 7 does not receive radiant heat from the turbine 3 of the turbocharger 2. Further, the upper part of the turbine 3 is covered with a heat insulator 5 made up of parts 5A and 5B. The parts 5A and 5B of the heat insulator 5 are made of, for example, a shape-retaining steel plate and a heat insulating material. It is the structure which laminated | stacked.

  A high-temperature exhaust gas discharged from the engine 1 is introduced into the turbine 3 of the turbocharger 2, and the turbine 3 is rotationally driven using the energy (kinetic energy and thermal energy) of the exhaust gas. The centrifugal compressor 8 is driven by the rotational force so that the pressure of the intake air is increased and sent to the engine 1.

  In the heat insulator 5 according to the present embodiment, as shown in FIG. 2 in which the section of the mating part of the parts 5A and 5B is enlarged, the mating parts of the parts 5A and 5B overlap each other with a required clearance therebetween. The end 5a of the overlapped inner part 5A is warped outward, and the end 5b of the outer part 5B is bent inward so as to cover the end 5a of the inner part 5A. The labyrinth structure is configured by the end portions 5a and 5b of these parts 5A and 5B.

  Thus, in this way, the hot air H that tends to leak out from the mating part of the parts 5A and 5B of the heat insulator 5 is warped outward at the part 5A inside the mating part. Is then folded back in the opposite direction by the end 5b of the outer part 5B that bends inward so as to cover the end 5a of the inner part 5A, and finally the outer end of the end 5b is further turned around. Therefore, the flow of the hot air H is subjected to the passage resistance by the twisted and curved flow path shape of the labyrinth structure, and the hot air H from the combined portion of the parts 5A and 5B of the heat insulator 5 is obtained. Leakage of water is greatly suppressed.

  Therefore, according to the above-described embodiment, the twisted and twisted flow of the labyrinth structure configured in the mating part of the parts 5A and 5B with respect to the hot air H that tends to leak from the mating part of the divided parts 5A and 5B Since the passage resistance can be given by the road shape, the leakage of hot air H from the mating portions of the parts 5A and 5B can be greatly suppressed, and the cable 7 is leaked due to the leakage of hot air H from the mating portions. Heat damage can be prevented in advance.

  Note that the heat insulator of the present invention is not limited to the above-described embodiment, and the heat generating device may be targeted for devices other than the turbocharger, for example, EGR piping, exhaust pipes, intake manifolds, etc. Of course, various modifications can be made without departing from the scope of the present invention.

1 Engine 2 Turbocharger 3 Turbine (heat generation equipment)
5 Heat Insulator 5A Parts 5B Parts 5a End 5b End 7 Cable (Peripheral Equipment)
H Hot air

Claims (2)

  A heat insulator that is divided into a plurality of parts and that can be attached to a heat generating device so as to shield radiant heat, wherein the overlapping portions of the parts overlap each other with a required clearance therebetween The labyrinth structure is formed in the mating part of each part by bending the end of the overlapping inner part outward and bending the end of the outer part inward so as to cover the end of the inner part. A heat insulator characterized by that.   The heat insulator according to claim 1, wherein the heat insulator is configured to cover at least a turbine as a heat generating device in a turbocharger of an automobile.

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