JP5772756B2 - Heat insulator - Google Patents

Description

  The present invention relates to a heat insulator, and more particularly, to a heat insulator in which heat insulating plates are stacked and a sound absorbing material is disposed therebetween.

  A heat insulator is used to block heat radiated from the heat source. When the heat source is a power source such as an engine or a rotating electric machine, vibration noise is also radiated to the outside. Therefore, as a heat insulator, two sound insulation materials are laminated, and a sound insulation material and a sound absorption material are provided on the sound insulation material.

  In Patent Document 1, the outer heat shield plate is heated and the two heat shield plates are welded and fixed by spot welding or the like, so that the outer heat shield plate is in close contact with the inner heat shield plate at room temperature. It is stated that it works.

  Patent Document 2 discloses a configuration in which a heat insulating sound absorbing material is sandwiched between insulator elements which are two layers of metal plates facing in parallel.

JP 2002-81317 A JP 11-107772 A

  If the sound absorbing material is misaligned when the sound absorbing material is partially disposed between the two laminated plates, a desired sound absorbing characteristic may not be obtained.

  An object of the present invention is to provide a heat insulator that can prevent a positional shift of a sound absorbing material that is hidden between laminated heat shield plates.

  The heat insulator according to the present invention includes a heat source side heat shield plate, an outer heat shield plate laminated on the heat source side heat shield plate, and a sound absorbing material disposed between the lamination of the heat source side heat shield plate and the outer heat shield plate. And a confirmation hole for confirming the end position of the sound absorbing material is provided in either the heat source side heat shield plate or the outer heat shield plate.

  In the heat insulator according to the present invention, the confirmation hole is preferably provided in the heat source side heat shield plate.

  In the heat insulator according to the present invention, it is preferable that the heat-source-side heat shield plate has a shape that matches the shape of the heat generating portion of the rotating electrical machine.

  Even if the sound absorbing material is hidden between the heat source side heat shield plate and the outer heat shield plate, the end position of the sound absorbing material can be confirmed by the confirmation hole of the above configuration, thus preventing the displacement. can do. Moreover, since the confirmation hole is not a through hole, heat shielding properties can be secured.

  In addition, since the confirmation hole is provided on the heat source side heat shield plate, heat radiation to the outside can be suppressed as compared with the case where the confirmation hole is provided on the outer heat shield plate.

  Further, since the heat insulator is matched to the shape of the rotating electrical machine, the influence of heat radiation, vibration noise, etc. from the rotating electrical machine can be effectively suppressed when a drive circuit or the like is disposed outside the rotating electrical machine.

It is the top view, bottom view, and sectional view of the insulator in the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the following, a heat insulator for a rotating electrical machine will be described. However, this is an illustrative example, and may be an object other than the rotating electrical machine as long as it is a heat source and a vibration source. The dimensions, shape, and the like may be changed to be used for internal combustion engines, combustion gas exhaust pipes, high power reactors, and the like.

  The number of stacked layers, the arrangement position, the shape, the material, and the like described below are exemplifications, and can be appropriately changed according to the specifications of the heat insulator.

  Hereinafter, in all the drawings, the same reference numerals are given to one or corresponding elements, and redundant description is omitted.

  FIG. 1 is a structural view of a heat insulator 10 for a rotating electrical machine, and is a cross-sectional view taken along line AA shown in the top view of the drawing, the bottom view of the bottom view, and the bottom view of the middle view. The heat insulator 10 is attached to the rotating electrical machine in order to prevent heat and vibration from the rotating electrical machine from being transmitted to a drive circuit device or the like disposed in the vicinity of the rotating electrical machine. In the example of FIG. 1, the heat insulator 10 has a planar shape. However, in some cases, the heat insulator 10 has a three-dimensional shape that matches the shape of the heat generating portion of the rotating electrical machine.

  The heat insulator 10 is disposed between the heat source side heat shield plate 12, the outer heat shield plate 14 stacked on the heat source side heat shield plate 12, and the stack of the heat source side heat shield plate 12 and the outer heat shield plate 14. A sound absorbing material 16 is included.

  The heat-source-side heat shield plate 12 is disposed on the side of the rotating electrical machine, which is a heat source, and receives radiant heat from the rotating electrical machine to suppress direct thermal radiation to the outside. The outer heat shield plate 14 is laminated on the heat source side heat shield plate 12 and receives radiant heat from the heat source side heat shield plate 12 to suppress direct heat radiation to the outside. Thus, by making the heat-source-side heat shield plate 12 and the outer heat shield plate 14 have a laminated structure, it is possible to effectively suppress heat from being transmitted from the rotating electrical machine to the drive circuit device or the like.

  As the heat source side heat shield plate 12 and the outer heat shield plate 14, a plate material made of a material having heat resistance and low thermal conductivity is used. As a material, a metal material such as a steel plate, a ceramic material, a heat-resistant plastic material, or the like can be used.

  The sound absorbing material 16 is disposed between a stack of the heat source side heat shield plate 12 and the outer heat shield plate 14 at a predetermined arrangement position, receives and attenuates vibration noise from the rotating electrical machine, and suppresses vibration noise to the outside. To do. The predetermined arrangement position is determined as a place where the vibration noise needs to be suppressed due to the arrangement relationship of the driving circuit device or the like with respect to the rotating electrical machine.

  As the sound absorbing material 16, a sheet of a material having heat insulation and good sound insulation can be used. For example, glass wool, a ceramic fiber sheet, a mica sheet, or a composite thereof can be used.

  The heat-source-side heat shield plate 12 and the outer heat shield plate 14 are joined and integrated with each other after the sound absorbing material 16 is disposed between the stacked layers. Welding is used as the joining means. Instead of welding, it is also possible to use pigeon staking, fastening means using bolts and nuts, screwing or the like. During the integration, a gap may be formed between the heat source side heat shield plate 12 and the outer heat shield plate 14 or between the heat source side heat shield plate 12, the sound absorbing material 16 and the outer heat shield plate 14. Since the air in the gap has a low thermal conductivity, this improves the heat shielding properties. In addition, since air has high sound insulation, transmission of vibration noise can be further suppressed.

  The confirmation holes 18 and 20 are openings provided for confirming the end position of the sound absorbing material 16 in the heat insulator 10. The confirmation holes 18 and 20 are provided at positions where the end positions of the sound absorbing material 16 can be most effectively confirmed. When the planar shape of the sound absorbing material 16 is rectangular as shown in FIG. 1, the sound absorbing material 16 is provided at two corners on the diagonal line among the four corners of the rectangular shape. When the sound absorbing material 16 is a polygon, the number of confirmation holes is preferably 3 or more in accordance with the polygon. Even when the sound absorbing material 16 is circular or elliptical, it is preferable that the number of confirmation holes is 3 or more. The size of the openings of the confirmation holes 18 and 20 can be determined by the shape of the sound absorbing material 16, the visibility, the size of the arrangement position error recognized in the sound absorbing material 16, and the like. For example, a circular opening having a diameter of about 5 to 10 mm can be obtained.

  The confirmation holes 18 and 20 are provided only on the heat source side heat shield plate 12 side so as not to penetrate the outer heat shield plate 16. When the through hole is used, heat and vibration noise from the rotating electrical machine are directly transmitted to the drive circuit device and the like. From the viewpoint of not using the through holes, the confirmation holes 18 and 20 may be provided in either the heat source side heat shield plate 12 or the outer heat shield plate 14. By providing the confirmation holes 18, 20 toward the heat source side heat shield plate 12, the heat leaking from the confirmation holes 18, 20 can be blocked by the outer heat shield plate 16. When the confirmation holes 18 and 20 are provided on the outer heat shield plate 16, the heat that cannot be blocked by the heat source side heat shield plate 12 directly becomes radiant heat or the like and is released to the drive circuit device side or the like. The Therefore, the confirmation holes 18 and 20 are preferably provided on the heat source side heat shield plate 12.

  The confirmation holes 18 and 20 are provided when the arrangement position of the sound absorbing material 16 is shifted, and if the confirmation holes 18 and 20 are not provided, the confirmation holes 18 and 20 are left as they are. It is because it falls.

  As described above, the sound absorbing material 16 is sandwiched between the stacks of the heat source side heat shield plate 12 and the outer heat shield plate 14 so that the predetermined arrangement position can be obtained without using any special fixing means. At this time, the arrangement position of the sound absorbing material 16 may be shifted.

  For example, as a method of assembling the heat insulator 10, a method can be used in which a sheet of the sound absorbing material 16 is disposed at a predetermined position on the heat source side heat shield plate 12 and the outer heat shield plate 14 is placed thereon and welded. . At this time, the arrangement position of the sound absorbing material 16 can be previously known on the heat source side heat shield plate 12 by scribing or the like, and by arranging the sound absorbing material 16 at the scoring position, the arrangement position of the sound absorbing material 16 once. Can be secured. After that, welding is performed, but the sound absorbing material 16 is simply sandwiched between the stacks of the heat source side heat shield plate 12 and the outer heat shield plate 14, so depending on the external force applied in the welding process, etc. The arrangement of the material 16 may deviate from the ruled position.

  By providing the confirmation holes 18 and 20, the end position of the sound absorbing material 16 can be confirmed immediately before the welding process, during the welding process, and after the welding process is completed. Thereby, the position of the sound absorbing material 16 can be guaranteed, and the arrangement position of the sound absorbing material 16 can be prevented from shifting. If it is confirmed that the arrangement position of the sound absorbing material 16 has shifted, measures such as rework processing and disposal processing can be quickly executed.

  10 heat insulator, 12 heat source side heat shield plate, 14 outer heat shield plate, 16 sound absorbing material, 18, 20 confirmation hole.

Claims (3)

A heat source side heat shield,
An outer heat shield laminated on the heat source heat shield;
A sound absorbing material disposed between the stack of the heat source side heat shield and the outer heat shield;
Including
A heat insulator, wherein a confirmation hole for confirming an end position of the sound absorbing material is provided in either the heat source side heat shield plate or the outer heat shield plate. The heat insulator according to claim 1,
The confirmation hole is provided in the heat source side heat shield plate. In the heat insulator according to claim 1 or 2,
A heat insulator characterized in that the heat source side heat shield plate has a shape matched to the shape of the heat generating part of the rotating electrical machine.

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