JP6636298B2 - Heat insulator - Google Patents

Description

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

  2. Description of the Related Art Conventionally, some engines such as automobiles are equipped with a turbocharger to improve the intake efficiency of the engine. In this type of turbocharger, the energy (kinetic energy and thermal energy) ), The turbine is driven to rotate, and the rotational force drives a centrifugal compressor to increase the pressure of the intake air and send it to the engine.

  Here, high-temperature exhaust gas immediately after being discharged from the engine is guided to the turbine of the turbocharger, and the temperature of the turbine rises to a high temperature during operation of the engine. If equipment that is sensitive to heat, such as pipes (intake pipes, etc.) and cables, is made of steel, the turbine side of the turbocharger must be installed in order to prevent heat damage from radiant heat to these equipment. Measures have been taken to cover with heat insulators.

  This type of heat insulator is attached to a heat-generating device such as a turbine via a plurality of attachment portions. However, when a remarkable relative displacement occurs due to thermal deformation between the attachment portions, the respective attachment portions are attached. The heat insulator is divided into multiple parts between the parts, and the divided parts overlap each other with a phase shift, so that the required range can be covered and the heat can be absorbed, but the relative displacement due to thermal deformation can be absorbed. It is.

  Prior art document information related to such a heat insulator includes the following Patent Document 1.

JP 2013-5068 A

  However, when overlapping the parts of the heat insulator, it is necessary to secure a required gap by shifting the phase so that no noise or wear occurs in the overlapping portion. There is a risk that the high-temperature hot air rising from the gap between the overlapping parts of the above-mentioned parts may reach the peripheral devices and cause heat damage to the peripheral devices.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a heat insulator that can be attached to a plurality of attachment portions that generate relative displacement due to thermal deformation without employing a divided structure.

The present invention is a heat insulator that is attached to a heating device via a plurality of attachment portions and shields radiant heat to peripheral devices, wherein a relative heat generated between the attachment portions due to thermal deformation of the heating device side is provided. In order to absorb the displacement, a step portion crossing between the respective mounting portions is formed by bending, and a pair of the step portions are arranged in parallel so as to be bent in opposite directions between the respective mounting portions with respect to the heating device. And is formed so as to form a hat-shaped cross section with a flat upper surface.

  Thus, even if a relative displacement occurs between the mounting portions due to thermal deformation on the heating device side, the bent portion of the step portion crossing between the mounting portions is elastically deformed. Since the relative displacement is absorbed by doing so, even if the heat insulator is not divided into a plurality of parts between the mounting portions, a single heat insulator covers a wide range of the heat generating device and the peripheral devices and the like. Radiant heat can be shielded.

  Moreover, by not dividing the heat insulator into a plurality of parts between each of the mounting portions, the heat insulator per sheet becomes larger than before, but the step portion functions as a reinforcing bead. By doing so, the rigidity is maintained, and it is possible to prevent insufficient rigidity due to the increase in the size of the heat insulator.

Further, in the present invention, a pair of steps which are bent in opposite directions are arranged side by side between the respective mounting portions for the heat-generating device so as to form a hat-shaped cross section. This is effective when the displacement is large, and it is possible to further improve the rigidity.

  Further, in the present invention, it is possible to add a step portion to a portion not sandwiched between the mounting portions, and in this case, by making the step portion function as a reinforcing bead, It is also possible to increase the rigidity in a portion not sandwiched between the mounting portions, and to avoid bending or the like even if the cantilever extends from the mounting portion for a long time.

  According to the above-described heat insulator of the present invention, various excellent effects as described below can be obtained.

  (I) Since it is possible to mount a plurality of mounting portions that cause relative displacement due to thermal deformation without employing a divided structure, a gap that leaks hot air between the mounting portions is not formed. Thus, heat damage to peripheral devices due to leakage of hot air from the gap can be prevented.

  (II) If a pair of steps which are bent in opposite directions are arranged side by side between the mounting parts so as to form a hat-shaped cross section, particularly when the relative displacement due to thermal deformation is large, the relative displacement Can be effectively absorbed by the pair of steps, and the rigidity can be further improved.

  (III) If a step portion is added to a portion not sandwiched between the mounting portions, the rigidity at a portion not sandwiched between the mounting portions can be increased by making the step portion function as a reinforcing bead. Also, even if it is cantilevered and extended from the mounting portion, bending or the like can be avoided.

BRIEF DESCRIPTION OF THE DRAWINGS It is the perspective view which looked at an example of embodiment of this invention from diagonally upward. FIG. 2 is a perspective view of the heat insulator of FIG. 1 as viewed from above. FIG. 3 is a perspective view of the heat insulator of FIG. 2 as viewed from a viewpoint lower than that of FIG. 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show an example of an embodiment of the present invention. In the example of the heat insulator 1 shown here, an outlet pipe portion 2 of a turbine of a turbocharger mounted on an automobile engine generates heat. The outlet pipe 2 is provided with bolt bosses 3, 4, 5 as projecting portions for mounting the heat insulator 1, and the heat insulator 1 is mounted on the bolt bosses 3, 4, 5. It can be fastened with bolts 6, 7, and 8.

  Here, in a portion where the thermal load is large, such as the outlet pipe section 2 of the turbine, when the engine is stopped and the engine is operated at high speed and high load, high-temperature exhaust gas flows inside. Although a large thermal deformation occurs during the hot state and a relative displacement occurs between the bolt bosses 3, 4, and 5, in this embodiment, the heat insulator is provided between the bolt bosses 3, 4, and 5 in the present embodiment. Instead of adopting a structure in which 1 is divided into a plurality of parts, a single heat insulator 1 can cover a wide area over each bolt boss 3, 4, 5 so as to shield radiant heat to peripheral devices. is there.

  That is, a stepped portion 9 traversing the bolt bosses 3, 4, 5 between the bolt bosses 3, 4, 5 so as to absorb the relative displacement caused by the thermal deformation of the outlet pipe 2 side. 10 and 11 are formed by bending, and particularly between the bolt bosses 4 and 5 having a large relative displacement, a pair of stepped portions 10 and 11 which are bent in opposite directions are arranged side by side to form a hat-shaped cross section. Has formed.

  Further, in the example shown here, the step portion 12 is also added to a portion not sandwiched between the bolt bosses 3, 4, and 5. More specifically, the step portion 12 is provided at one end of the heat insulator 1. The step portion 12 is also formed in a portion outside a certain bolt boss 5.

  Reference numeral 13 in FIG. 2 denotes a resin-made intake pipe shown as an example of peripheral devices to be shielded by the heat insulator 1 from radiant heat from the outlet pipe section 2 of the turbine. It is a matter of course that equipment that is weak to heat, such as various pipes and cables other than the resin intake pipe 13, may be protected.

  Thus, even if a relative displacement occurs between the bolt bosses 3, 4, and 5 due to thermal deformation on the outlet pipe portion 2 side, the bolt bosses 3, 4, and 5 cross each other. The relative displacement is absorbed by elastically deforming the bent portions of the stepped portions 9, 10, and 11, so that the heat insulator 1 is not divided into a plurality of parts between the bolt bosses 3, 4, and 5. However, it is possible to cover radiant heat to peripheral devices with a single heat insulator 1 covering a wide range of heat generating devices.

  In addition, since the heat insulator 1 is not divided into a plurality of parts between the bolt bosses 3, 4, and 5, the size of the heat insulator 1 per sheet is more easily increased than before. The rigidity is maintained by the function of the reinforcement beads 10 and 11, and it is possible to prevent insufficient rigidity due to the increase in the size of the heat insulator 1.

  Therefore, according to the above embodiment, it is possible to mount the bolt bosses 3, 4, and 5 which generate relative displacement by thermal deformation without employing the divided structure, and therefore, the bolt bosses 3, 4, and 5 are provided between the respective bolt bosses 3, 4, and 5. A gap that causes hot air to leak out is not formed, and heat damage to the intake pipe 13 and the like due to hot air leaking from the gap can be prevented.

  Further, in the present embodiment, a pair of stepped portions 10 and 11 that bend in opposite directions are juxtaposed to form a hat-shaped cross section particularly between the bolt bosses 4 and 5 having particularly large relative displacement. As a result, the relative displacement between the bolt bosses 4 and 5 can be effectively absorbed by the pair of steps 10 and 11, and the rigidity can be further improved.

  Further, since the stepped portion 12 is added to a portion not sandwiched between the bolt bosses 3, 4, and 5, the stepped portion 12 functions as a reinforcing bead, so that the bolt bosses 3, 4, and 5 are provided. The rigidity of the portion not caught can also be increased, and even if it is cantilevered and extended from the bolt boss 5, bending or the like can be avoided.

  It should be noted that the heat insulator of the present invention is not limited to the above-described embodiment, and the heat-generating device may be a device other than the outlet pipe of the turbocharger. For example, the turbine itself, the EGR pipe, the exhaust pipe Needless to say, various modifications may be made without departing from the scope of the present invention.

1 Heat insulator 2 Outlet piping (heating equipment)
3 Bolt boss (mounting part)
4 Bolt boss (mounting part)
5 Bolt boss (mounting part)
9 Step part 10 Step part 11 Step part 12 Step part 13 Intake pipe (peripheral equipment)

Claims (2)

A heat insulator attached to a heating device through a plurality of mounting portions to shield radiant heat to peripheral devices, and absorbs relative displacement generated by thermal deformation of the heating device side between the mounting portions. In order to obtain, a stepped portion crossing between the mounting portions is formed by bending, and the stepped portion is arranged in a pair so as to be bent in opposite directions between the mounting portions with respect to the heating device , and the upper surface is formed. A heat insulator formed to have a flat hat-shaped cross section.   The heat insulator according to claim 1, wherein a step portion is added to a portion not sandwiched between the mounting portions.

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