JP2018178765A - Cover member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover member capable of blocking heat dissipation from an exhaust gas exhausted from a heat source without using a heat insulating material. SOLUTION: An outer layer member 20 fixed so as to surround the outer periphery of an exhaust manifold pipe 122 capable of conducting exhaust gas discharged from an engine 110, and a corrugated molding material 30 provided between the outer layer member 20 and the exhaust manifold pipe 122. A cover member 1 composed of, and a closed closed space V is formed between the outer layer member 20 and the corrugated molding material 30 and between the exhaust manifold pipe 122 and the corrugated molding material 30, respectively. [Selection diagram] Fig. 1

Description

  The present invention relates to a cover member installed on a heat source such as an exhaust manifold.

For example, in response to recent exhaust gas regulations, etc., a catalyst having a function of purifying exhaust gas is provided in the middle of the exhaust path of exhaust gas discharged from an automobile engine, and harmful substances (hydrocarbons (HC ), Carbon monoxide (CO), nitrogen oxides (NO _x ), etc. are converted to harmless substances (water (H ₂ O), carbon dioxide (CO ₂ ), nitrogen (N ₂ )). Since the activation temperature of this catalyst is about 250 ° C. or more, it is necessary to promptly raise the temperature of the catalyst after starting the engine that generates high temperature in order to exert the purification performance.

  For this reason, a catalytic converter equipped with a catalyst is disposed immediately below the exhaust manifold (hereinafter referred to as "exhausi manifold") so that exhaust heat of exhaust gas from the engine (about 950.degree. C.) can be used. It blocks the release of heat.

  Thus, for the problem that the temperature changes and desired performance can not be obtained due to heat radiation or heat absorption, for example, the cover member disclosed in Patent Document 1 is a heat insulating material having a mesh member attached to the inner surface side The outer layer member is overlapped and configured, and the heat radiation can be blocked from the exhaust manifold to the outside by abutting and surrounding the mesh member around the exhaust manifold. As a result, the heat radiation from the exhaust gas passing through the exhaust manifold can be suppressed, and the exhaust gas held at high temperature can be sent to the catalytic converter, and the temperature of the catalyst can be raised promptly after the engine is started. .

  However, since the heat insulating material provided on the outside of the exhaust manifold is exposed to excessive temperature change, it deteriorates over time with the operation of the internal combustion engine, and a desired heat insulating effect can not be obtained. There was a risk that it could not be blocked.

JP, 2011-149338, A

  An object of this invention is to provide the cover member which can thermally insulate with respect to a heat source, without using a heat insulating material in view of the said problem.

  The present invention comprises an outer layer member fixed so as to cover the outer periphery of a heat source, and an inner layer member provided between the outer layer member and the heat source, and between the outer layer member and the inner layer member, and It is characterized in that it is a cover member configured to form a closed space respectively closed between the heat source and the inner layer member.

  The heat source includes not only a heat source emitting heat but also a cold heat source absorbing heat. Specifically, in order to conduct the heat medium discharged from the internal combustion engine or the cooling device, as well as the internal combustion engine generating high temperature such as an engine of a vehicle body, a cooling device provided in a refrigerator, a freezer or the like Piping etc. That is, it refers to one that is insulated by heat insulation by the cover member.

Fixing so as to cover the outer periphery of the heat source described above includes fixing the heat source directly to the heat source, and fixing the heat source relative to the heat source through another member, including a part of the heat source The case of covering and the case of surrounding the whole of the said heat source are included.
The outer layer member includes a case in which the heat source or the inner layer member is in direct or indirect contact with another member.

  The inner layer member may have any configuration as long as the inner layer member is disposed inside the outer layer member, for example, the inner layer member may be assembled to the outer layer member so as to divide a closed space formed between the outer layer member and the heat source. And a configuration that forms an independent closed space inside a closed space formed between the outer layer member and the heat source in contact with the heat source.

The above-mentioned closed enclosed space includes a sealed space, a sealed space, and the like so as to suppress the inflow and outflow of gas to the outside air.
A safe and highly stable gas such as air or a rare gas such as argon (Ar) may be enclosed in the enclosed space.

  Further, forming a closed space respectively closed between the heat source and the inner layer member described above includes the case where one or a plurality of closed spaces are formed by the inner layer member, and When a closed space is formed by the inner layer member and the outer layer member, or when the inner layer member, the outer layer member, and another member cooperate to form a closed space, the closed member is formed by the separate member Including the case.

According to the present invention, the heat source can be shielded against heat without using a heat insulating material.
More specifically, the cover member fixed to the heat source is, for example, the outer layer member so as to form a closed space respectively closed between the inner layer member and the heat source, and the outer layer member and the inner layer member. It is possible to suppress the flow of the air enclosed inside to the outside.

  Further, a closed space provided between the outer layer member and the inner layer member (hereinafter referred to as an inner closed space), and a closed space provided in the heat source and the inner layer member (hereinafter referred to as an outer closed space). The heat resistance can be improved by providing two closed spaces, each independently closed, thereby reducing the amount of heat released per unit time from the heat source to the outside or absorbed from the outside into the heat source. It can be done.

  Thus, by providing a closed space in the cover member, heat exchange between the heat source and the outside due to heat radiation or heat absorption can be prevented, so the temperature of the heat source can be reduced without using a heat insulating material as the cover member. Can be maintained.

  As a result, for example, the exhaust gas holding high temperature can be sent to the catalytic converter or the like disposed directly under the internal combustion engine which is a high heat source, so the catalyst temperature can be raised early to improve the catalyst activity, efficiently Harmful substances contained in exhaust gas can be converted to harmless substances.

  In addition, even when one of the outer layer member and the inner layer member is unintentionally damaged, a closed space formed by the other side remains, so heat is released from the heat source to the outside or to the heat source from the outside. It can block heat absorption. Thus, for example, the exhaust gas held at high temperature can be sent to the catalytic converter or the like, and harmful substances can be prevented from being discharged.

As an aspect of the present invention, the outer layer member may be configured to surround the entire circumference of the heat source.
According to the present invention, since it is possible to release heat from the heat source to the outside, or to close a path absorbed from the outside to the heat source, it is possible to interrupt the heat released from the heat source. Thereby, the temperature inside the heat source can be maintained to keep the temperature high.

Further, as an aspect of the present invention, the outer layer member and the heat source may be brought into contact with each other via a shock absorbing member that damps vibrations.
According to the present invention, the shock absorbing member can buffer the vibration caused by the operation of the heat source to reduce the vibration, so that the outer layer member falls off the heat source due to the vibration, and the outer layer member and the inner layer member are damaged. Can be prevented.

Further, as an aspect of the present invention, the buffer member may have heat insulation.
According to the present invention, the efficiency of heat conduction between the heat source and the outer layer member can be reduced, that is, the amount of heat conducted between the heat source and the outer layer member can be reduced. Therefore, the temperature in the heat source can be more reliably maintained.

Further, as an aspect of the present invention, the inner layer member may be formed of a metal plate in which a concavo-convex shape is formed.
The metal plate may be any metal plate as long as it is a metal having high temperature resistance, and may be, for example, stainless steel or iron.

  The uneven shape is flat when the heat source side is flat and uneven shape is formed on the outer layer member side, or when the outer layer member side is flat and uneven shape is formed on the heat source side, both sides thereof Including the case where the concavo-convex shape is formed.

  According to the present invention, since the deformability of the inner layer member can be improved, for example, the cover member can be easily and accurately formed and processed according to the shape of the heat source. Thereby, the cover member can be deformed while reliably maintaining the closed space.

  Further, by forming the inner layer member in a concavo-convex shape, it is possible to divide the inner closed space and the outer closed space into a plurality of closed spaces which are communicated with each other or mutually closed. The conductivity of the air can be reduced.

  Furthermore, since the outer layer member can be supported by the inner layer member when the convex portion having the uneven shape is in contact with the outer layer member, the strength and rigidity of the cover member can be improved. .

  According to the present invention, it is possible to provide a cover member which can thermally isolate a heat source without using a heat insulating material.

The schematic front view which shows the mounting state of a thermal insulation heat protector. The schematic side view which shows the mounting state of a thermal insulation heat protector. The schematic perspective view of a thermal insulation sheet. The schematic disassembled perspective view of a thermal insulation sheet. The top view of a thermal insulation sheet. Explanatory drawing by sectional drawing of a thermal insulation sheet. The schematic sectional drawing about the mounting state of heat insulation heat protection. Explanatory drawing about the mounting state of thermal insulation heat protection.

An embodiment of the invention will now be described in conjunction with the drawings.
1 shows a schematic front view showing the mounting state of the cover member 1, and FIG. 2 shows a schematic side view showing the mounting state of the cover member 1. As shown in FIG.

  3 shows a schematic perspective view of the heat shield sheet 10, FIG. 4 shows a schematic exploded perspective view of the heat shield sheet 10, FIG. 5 shows a plan view of the heat shield sheet 10, and FIG. The explanatory drawing by sectional drawing is shown. FIG. 7 shows a schematic cross-sectional view of the cover member 1 in a state of being mounted on the exhaust manifold 120, and FIG. 8 shows an explanatory view of the cover member 1 in a state of mounting on the exhaust manifold 120.

  In FIG. 3, a part of the outer layer member 20 is shown by a dotted line to indicate a transmission state, and the configuration of the corrugated molded material 30 assembled to the outer layer member 20 is clarified. Also in FIG. 4, similar parts are indicated by dotted lines.

  6 (a) shows a cross-sectional view taken along the line A-A in FIG. 5, FIG. 6 (b) shows a cross-sectional view taken along the line B-B in FIG. 5, and FIG. 8 shows a cross sectional view taken along the line C-C in FIG. 5, FIG. 6D shows a cross sectional view taken along the line D-D in FIG. 5, and FIG. 8A shows a cross sectional view taken along the line E-E in FIG. b) has shown the enlarged view of (alpha) part in Fig.8 (a).

  The exhaust system 100 of the engine in this embodiment includes an exhaust manifold 120 (exhaust manifold 120) through which exhaust gas discharged from the engine 110 is conducted, and a catalytic converter 130 (so-called direct manifold) directly connected to the downstream side of the exhaust manifold 120. The cover member 1 is attached to the exhaust manifold 120.

  Although the specific shape of the cover member 1 attached to the exhaust manifold 120 is different depending on the shape of the exhaust manifold 120 or the like to be attached, the installation location, and the peripheral structure, the basic configuration is the same.

  When the cover member 1 is described in detail based on FIG. 1 and FIG. 2, the cover member 1 sandwiches and covers the exhaust manifold 120 from above and below in the two heat shielding sheets 10 formed according to the shape of the exhaust manifold 120. It is installed in the exhaust manifold 120 by installing and fixing two heat shielding sheets 10 to each other.

  The upstream end of the cover member 1 is in contact with the exhaust manifold pipe 122 extending from the flange 121 of the exhaust manifold 120 joined to the engine 110, and the downstream end of the cover member 1 is connected to the catalytic converter 130. 122 is abutted.

  The cover member 1 mounted in this manner circumferentially surrounds the joint portion between the engine 110 and the exhaust manifold 120, that is, the portion directly below the flange 121 to the connection portion between the exhaust manifold 120 and the catalytic converter 130.

Further, a closed space V in which air is enclosed is formed between the exhaust manifold 120 and the cover member 1 so as to prevent the air from flowing substantially outward.
Although air is sealed in the closed space V in the present embodiment, it is not necessary to be air, and a safe and highly stable gas may be sealed, or a vacuum may be used.

Next, the heat shield sheet 10 forming the cover member 1 will be described based on FIG. 3 to FIG. In addition, in FIG. 3 thru | or 6, in order to clarify the structure of the heat shielding sheet 10, although the heat shielding sheet 10 shall be formed in flat form, it shape | molds according to the shape of an installation location in fact.
As shown in FIG. 3 and FIG. 4, the heat shield sheet 10 is configured by assembling the corrugated molding material 30 from below to the outer layer member 20 provided on the upper part.

  The outer layer member 20 corresponding to the outer layer member is a plate material made of a flexible stainless steel stainless steel foil material, and is extended downward from the top plate 21 and each end of the top plate 21 by a predetermined length. The side wall 22 and the protrusion 23 protruding outward from the lower end of the side wall 22 are provided, and the lower end surface of the protrusion 23 is provided with the buffer member 50.

The height of the side wall 22 and the amount of protrusion of the protrusion 23 are appropriately designed according to the shape of the mounting portion, the peripheral structure, and the like.
Although the side wall 22 extends downward from the four-direction end of the top 21, it does not necessarily extend downward from all four directions, and both ends in the first direction x or the second direction y orthogonal to the plane direction It may be configured to extend downward from the unit.

  The buffer member 50 provided in the projecting portion 23 is formed by weaving an inorganic fiber-based material well-known as a heat insulating material such as glass wool or rock wool so as to have a thickness capable of absorbing vibration. This thickness is appropriately designed according to the place to be installed, the desired degree of vibration absorption, the thermal conductivity of the arrangement place, and the like.

  Corrugated molded material 30 corresponding to the inner layer member is formed of a stainless steel foil material made of 304 stainless steel and is subjected to corrugating processing extending in the first direction x and the second direction y. It is a molding material in which the corrugated shape constituted by the unevenness which extends in the direction y is formed.

  Describing the corrugate shape formed on the corrugate molding material 30 in detail, concave valleys 31 and convex ridges 32 formed along the first direction x are alternately arranged along the second direction y. And the convex portion 33 and the concave portion 34 are alternately arranged along the first direction x in the valley portion 31 and the peak portion 32 formed along the first direction x, and the corrugated shape is configured. (See FIGS. 4 to 6).

  The convex portion 33 is formed of a wave convex portion of a wave, and the concave portion 34 is formed of a wave concave portion. The width in the second direction y of the convex portion 33 in the peak portion 32 is the narrowest, and the width in the second direction y of the concave portion 34 is the widest. Further, the concave shape in the valley portion 31 is formed. The width of the portion 34 in the second direction y is the smallest, and the width of the convex portion 33 in the second direction y is the largest (see FIG. 6).

  The difference in height between the convex portion 33 and the concave portion 34 is substantially the same as the height of the side wall 22.

A valley bottom surface 31 a is formed in the valley portion 31, a mountain top surface 32 a is formed in the mountain portion 32, and a connecting side surface 40 connecting the valley bottom surface 31 a and the mountain top surface 32 a is formed. In other words, in the cross section in the second direction y, the valley portion 31 is formed in a substantially rectangular concave shape by the valley bottom surface 31a and the connection side surface 40 formed on both sides in the second direction y, and the peak portion 32 is the peak upper surface 32a. And a connecting side surface 40 formed on both sides in the second direction y, so as to form a substantially square reverse concave shape. Further, in the cross section in the second direction y, the angle formed by the connecting side surface 40 with the mountain top surface 32a or the valley bottom surface 31a is approximately 90 ° in the range of 80 ° to 100 °.
The angle between the connecting side surface 40 and the mountain top surface 32a or the valley bottom surface 31a does not necessarily have to be 80 to 100 degrees. For example, the angle formed by the mountain top surface 32a or the valley bottom surface 31a is an acute angle. You may change suitably.

The corrugated molding material 30 configured as described above is fitted to the outer layer member 20 so as to be a flat rectangular shape having the same area as the top plate 21, and the end of the corrugated molding material 30 and the inner side of the protruding portion 23 The heat shield sheet 10 is formed by welding and integrating the end portions.
In addition, although the outer layer member 20 and the corrugate molding material 30 are integrated by welding, it is not necessary to necessarily integrate by this method, for example, you may fix using a bolt etc.

  As shown in FIG. 6, the heat shield sheet 10 is substantially flush with the bottom surface side of the buffer member 50 provided with the concave portion 34 of the valley portion 31 and the convex portion of the peak portion 32 as shown in FIG. Reference numeral 33 is in contact with the top 21.

As described above, the heat shield sheet 10 configured as described above is molded (pressed) into a three-dimensional shape in accordance with the shapes of target members such as the exhaust manifold 120 and the catalytic converter 130, and constitutes the cover member 1. Or can be assembled to the catalytic converter 130.
The heat shielding sheet 10 may be formed by combining the molded outer layer member 20 and the corrugated molding material 30, or the heat shielding sheet 10 may be deformed.

Hereinafter, a state in which the cover member 1 subjected to the pressing process is assembled to the exhaust manifold 120 will be described based on FIGS. 7 and 8.
Here, in FIGS. 7 and 8, in order to simplify the description, the exhaust manifold 120 is an annular tube, and the flow direction of the exhaust gas conducted through the inside of the exhaust manifold 120 is referred to as the conduction direction D. Further, the second direction y of the heat shield sheet 10 is made to coincide with the conduction direction D, and the lateral direction in FIG. 8 is taken as the first direction x.

First, a method of manufacturing the cover member 1 will be briefly described.
Two corrugated moldings 30 of appropriate size are prepared, and the corrugated moldings 30 are bent in a semicircular shape by bending so that the surfaces along the apexes of the adjacent concave portions 34 become the same as the outer diameter of the exhaust manifold 122. Press forming and molding.

Similarly, two outer layer members 20 one size larger than the corrugated molding material 30 are prepared, and the top plate 21 has the same outer diameter as the semicircle formed by the surface along the apex of the convex portion 33 of the corrugated molding material 30. Thus, the outer layer member 20 is bent and formed into a semicircular shape by pressing.
In the outer layer member 20 in this case, the side walls 22 are provided only at both ends of the top plate 21 in the second direction y.

  The corrugated molding material 30 is fitted from below to the outer layer member 20 thus pressed and welded, and the heat shielding sheet 10 having a semicircular cross-sectional view is formed. Top plates 21 (hereinafter referred to as top plate end portions 21a) left on both ends in the first direction x are formed so as to protrude outward in the radial direction of the arc.

  Then, the heat shielding sheet 10 formed respectively is installed so as to sandwich the exhaust pipe 122 from above and below (see FIG. 8), and the top plate end 21a provided on the upper heat shielding sheet 10 (top plate end Heat shielding sheet by folding back the top plate end 21a (top plate end 21ad) provided on the lower heat shield sheet 10 in the portion 21au) and caulking the top plate ends 21a from each other in the vertical direction 10 are fixed to each other and fixed to the exhaust manifold pipe 122. In this state, the second direction y in the heat shield sheet 10 is along the conduction direction D.

  In the present embodiment, in order to simplify the description, the second direction y and the conduction direction D of the heat shield sheet 10 coincide with each other, and the heat shield sheet is arranged such that the horizontal direction in FIG. 10 is disposed and formed, for example, the heat shield sheet 10 may be disposed so as to coincide with the conduction direction D and the first direction x, or the conduction direction D intersects with the first direction x The heat shield sheet 10 may be disposed along the direction in which In other words, the heat shielding sheet 10 that has been molded does not have to be formed such that the concave portion 34 and the convex portion 33 of the corrugated molding material 30 are along a specific direction.

  Further, in the present embodiment, the heat shielding sheets 10 are mutually folded by folding back and caulking a part of the one outer layer member 20 (top plate end 21au) so as to wrap a part of the other outer layer member 20 (top plate end 21ad). However, the method for fixing the heat shielding sheets 10 is not limited to this configuration, and for example, the outer layer members 20 are fixed by bolts or clips, or the outer layer members 20 are fixed by welding. May be

  In the cover member 1 assembled to the exhaust manifold pipe 122 in this manner, the buffer member 50 provided at the end of the heat shield sheet 10 is the upstream side of the exhaust manifold pipe 122 (a part directly below the flange 121) and the downstream side of the exhaust manifold pipe 122 A closed space V, which is in contact with (in the vicinity of the catalytic converter 130) and between the outer layer member 20 and the exhaust manifold pipe 122, the air is prevented from flowing in and out.

  Further, as described above, the convex portion 33 constituting the corrugated molding material 30 is in contact with the top plate 21, and the concave portion 34 constituting the corrugated molding material 30 is in contact with the exhaust manifold pipe 122. Is divided into a plurality of first closed spaces V1 formed by the outer layer member 20 and the corrugated molding material 30, and a plurality of second closed spaces V2 formed by the outer layer member 20 and the exhaust manifold pipe 122.

  Since the plurality of first closed spaces V1 and the second closed spaces V2 respectively form independent closed closed spaces such as the other first closed space V1 and the second closed space V2, the inflow of air to each other is caused. Have been suppressed. Therefore, the convection of air in the closed space V can be prevented.

  In addition, since the first closed space V1 and the second closed space V2 are formed in plurality, for example, even if a portion of the first closed space V1 is broken, the other first closed space V1 maintains the closed space. Therefore, even if it is damaged unintentionally, the heat radiation of the exhaust manifold pipe 122 can be prevented.

  The cover member 1 configured in this manner conducts the exhaust gas discharged from the engine 110 and fixes the outer layer member 20 fixed so as to surround the outer periphery of the exhaust manifold pipe 122 for radiating heat, the outer layer member 20 and the exhaust manifold pipe 122 Between the outer layer member 20 and the corrugate molding material 30 and between the exhaust pipe 122 and the corrugate molding material 30, and the first closed space V1 is closed. Since the second closed space V2 is formed, the heat radiation from the exhaust manifold pipe 122 can be blocked without using the heat insulating material.

  More specifically, the cover member 1 fixed to the exhaust manifold pipe 122 is such that the top plate end 21 ad of the heat shield sheet 10 disposed below is wrapped by the top plate end 21 au of the heat shield sheet 10 disposed above. By folding and caulking, the first closed space V1 and the second closed space V2 which are closed between the corrugated molding 30 and the exhaust manifold pipe 122, and the outer layer member 20 and the corrugated molding 30, respectively, are formed. For this reason, it is possible to prevent the air enclosed in the first closed space V1 and the second closed space V2 from being discharged to the outside of the cover member 1 from between the members 21a.

  Further, by dividing the closed space V into the first closed space V1 and the second closed space V2, the thermal resistance of the cover member 1 can be improved, so the unit time per unit time transmitted from the exhaust manifold pipe 122 to the outer layer member 20 Can reduce the amount of heat. That is, the amount of heat per unit time discharged from the exhaust manifold pipe 122 to the outside can be reduced. Therefore, the heat accumulated inside the exhaust manifold pipe 122 can be held, and the exhaust gas kept at a high temperature can be sent to the catalytic converter 130.

  As described above, by forming the first closed space V1 and the second closed space V2 which are air layers in the cover member 1, the thermal resistance can be improved, and the amount of heat released to the outside from the exhaust manifold pipe 122 is reduced. be able to. Therefore, the heat of the exhaust gas exhausted from the engine 110 can be blocked from being dissipated from the exhaust manifold pipe 122 without using a heat insulating material inside the cover member 1. As a result, the exhaust gas holding the high temperature can be sent to the catalytic converter 130 or the like located downstream of the exhaust manifold pipe 122, and harmful substances contained in the exhaust gas can be efficiently changed to harmless substances.

  Also, in recent years, gasoline may be burned with a lean air-fuel ratio in which the concentration of gasoline is made thinner than the ideal air-fuel ratio to improve fuel consumption (lean combustion). This lean combustion is a stoichiometric air-fuel ratio. Nitrogen oxide (NOx), which is a toxic gas, is more likely to be generated as compared to metric combustion. Therefore, when the temperature of the catalyst provided in the catalytic converter 130 is sufficiently activated, stoichiometric combustion is switched to lean combustion, which can reduce the emission of toxic gas as much as possible.

  In this embodiment, since the heat radiation from the exhaust manifold piping 122 is blocked by surrounding the exhaust manifold piping 122 with the cover member 1, the exhaust gas flowing through the exhaust manifold piping 122 can be maintained at a high temperature. As a result, the exhaust gas held at high temperature can be sent to the catalytic converter 130, and the temperature of the catalyst can be efficiently raised. Therefore, the fuel consumption can be improved by shifting from the stoichiometric combustion to the lean air-fuel ratio at an early stage.

  In addition, for example, even if the outer layer member 20 is damaged unintentionally, the corrugated molded material 30 can block the heat radiation from the exhaust manifold pipe 122, so that the exhaust gas holding high temperature is sent to the catalytic converter 130 or the like. Can prevent the discharge of harmful substances.

  Furthermore, when the cover member 1 is fixed to the exhaust manifold pipe 122, the influence of the vibration of the engine 110 can be reduced, and the detachment and damage of the cover member 1 due to the vibration can be prevented. Therefore, the exhaust gas holding the high temperature can be reliably sent to the catalytic converter 130 and the like, the activation efficiency of the catalyst can be improved, and the emission of harmful substances can be prevented.

  In addition, the outer layer member 20 can reduce the amount of heat released from the exhaust manifold pipe 122 to the outside by surrounding the entire circumference of the exhaust manifold pipe 122, so that the amount of heat released from the exhaust manifold pipe 122 can be reduced. it can. Thus, the temperature of the exhaust gas can be maintained at a high temperature, and the activation efficiency of the catalyst provided in the catalytic converter 130 or the like can be improved.

  Furthermore, since the outer layer member 20 and the exhaust manifold pipe 122 are in contact with each other via the shock absorbing member 50 capable of absorbing the vibration, the shock absorbing member 50 buffers the vibration and the like caused by the operation of the engine 110, It is possible to prevent the outer layer member 20 from falling off the exhaust manifold pipe 122 and damaging the outer layer member 20 and the corrugated molding material 30 due to vibration.

  In addition, since the corrugate molding material 30 in contact with the exhaust manifold pipe 122 and the outer layer member 20 is subjected to corrugation processing that extends in the first direction x and the second direction y, it has elasticity in the concavo-convex direction Since the vibration of the engine 110 can be absorbed and the air vibration causing the sound can be absorbed, it also has a sound insulation effect.

  Furthermore, since the buffer member 50 has thermal insulation, the efficiency of heat conduction from the exhaust manifold piping 122 to the outer layer member 20 can be reduced, and the heat released from the exhaust gas conducting the exhaust manifold piping 122 is the outer layer Heat conduction to the member 20 can be blocked. Therefore, the exhaust gas holding the high temperature can be sent to the catalytic converter 130 disposed downstream of the exhaust manifold pipe 122, and the activation efficiency of the catalyst provided in the catalytic converter 130 and the like can be improved.

  When the cover member 1 is formed by overlapping and fixing the outer layer members 20a as in the present embodiment, the buffer member 50 may be attached and fixed to the contact portion of the outer layer member 20a. You may remove and fix. When the buffer member 50 is attached and the two heat shield sheets 10 are bolted, since the buffer members 50 are stacked together, conduction of heat from one heat shield sheet 10 to the other heat shield sheet 10 Can interfere with

  Furthermore, the deformability of the corrugated molding material 30 can be improved by the corrugated molding material 30 being comprised with the metal plate (Stainless steel foil material made from 304 stainless steel) in which uneven | corrugated shape was formed. Therefore, when the cover member 1 is formed (pressed) according to the shape of the exhaust manifold pipe 122 etc., the first closed space V1 and the second closed space V2 can be deformed while being maintained as a closed space. .

  Further, by forming the corrugated molding material 30 in a concavo-convex shape, it can be divided into the first closed space V1 and the second closed space V2, so that the air in the first closed space V1 and the second closed space V2 can be divided. Conductivity can be reduced. Therefore, even if the outer layer member 20 and the corrugate molding material 30 constituting the cover member 1 are damaged, it is possible to prevent the air sealed inside from leaking out, so the amount of heat radiated from the exhaust manifold pipe 122 is reduced. Can.

  Furthermore, since the outer layer member 20 can be supported by the corrugated molding material 30 when the convex portion having the concavo-convex shape is in contact with the outer layer member 20, the strength and rigidity of the cover member 1 can be improved. .

Using the cover member 1 having such a configuration, the surface temperature of the outer layer member 20 and the exhaust manifold pipe 122 with respect to the temperature of the heat generating element as the heat source is shielded by sandwiching the heat insulating member between the outer layer member 20 and the exhaust manifold pipe 122 As a result of comparison with the thermal heat protector, there were no differences in the temperatures of the outer layer member 20 and the exhaust manifold pipe 122. It was also confirmed that there was no difference in the rise time of the exhaust manifold pipe 122 either.
From this point of view, the cover member 1 has no difference in performance from the heat shield and heat protector using the conventional heat insulating member.

In correspondence with the configuration of the present invention and the above-described embodiment,
The heat source of the present invention corresponds to the exhaust manifold pipe 122, and so on.
The cover member corresponds to the cover member 1,
The outer layer member corresponds to the outer layer member 20,
The inner layer member corresponds to the corrugated molding material 30, but
The present invention is not limited to the configuration of the above-described embodiment, and many embodiments can be obtained.

  For example, in the present embodiment, the cover member 1 is configured to surround only the exhaust manifold pipe 122, but not limited to this configuration, for example, a configuration that covers a part of the exhaust manifold pipe 122 or all or part of the engine 110 It may be configured to cover or surround all or part of the exhaust manifold piping 122 included.

  Furthermore, not only the exhaust manifold piping 122 but also a part or all of the catalytic converter 130 disposed downstream of the exhaust manifold piping 122, an underfloor converter or muffler disposed downstream of the catalytic converter 130, etc. It may be enclosed, or piping etc. connecting these catalytic converters may be enclosed.

  Furthermore, in the present embodiment, the cover member 1 encloses the heat radiating body that generates high temperature, but for example, the piping through which a cooling gas or the like passes or the cooling device is surrounded to prevent heat absorption to the inside of the piping etc. It can also be used.

  That is, the site covered with the cover member 1 may be any place where heat radiation and heat absorption from the covered site are desired to be prevented, and the heat retention purpose is not limited to activating the catalyst, For example, it may be intended to move the heat medium to another place while suppressing the temperature change of the heat medium due to the heat radiation or heat absorption of the heat medium conducted through the piping or the like.

Also, for example, although the outer layer member 20 is in contact with the exhaust manifold pipe 122 via the buffer member 50, it may be in direct contact with the exhaust manifold pipe 122, for example.
The corrugated molded material 30 may have any configuration as long as the closed space V is divided into two or more closed spaces. For example, the closed space formed between the outer layer member 20 and the exhaust manifold pipe 122 A structure assembled to the outer layer member 20 in contact with the exhaust manifold pipe 122 so as to separate V, or one or more housings in contact with the exhaust manifold pipe 122 to form the first closed space V1 Including the case.
Further, instead of the corrugated molding material 30, flat plate materials separated by a predetermined distance may be used.

  In addition, although the outer layer member 20 and the corrugate molding material 30 are made of stainless steel foil material made of stainless steel, it does not have to be stainless steel, and any metal having high temperature resistance may be used. It may be made of iron or the like.

DESCRIPTION OF SYMBOLS 1 heat-insulation heat protector 20 aluminum plate 30 corrugated molding material 50 buffer member 122 exhaust manifold piping V closed space

Claims (5)

An outer layer member fixed so as to cover the outer periphery of the heat source;
It is comprised by the inner layer member provided between the said outer layer member and the said heat source,
A cover member configured to form a closed space respectively closed between the outer layer member and the inner layer member, and between the heat source and the inner layer member. The outer layer member is
The cover member according to claim 1, configured to surround the entire circumference of the heat source. The cover member according to claim 1 or 2, wherein the outer layer member and the heat source are in contact with each other through a shock absorbing member capable of absorbing vibration. The cover member according to claim 3, wherein the buffer member has a heat insulating property. The inner layer member is
The cover member in any one of the Claims 1 thru | or 4 comprised with the metal plate formed by uneven | corrugated shape.

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