CN111350572A

CN111350572A - Heat shield for engine catalyst

Info

Publication number: CN111350572A
Application number: CN201811583966.7A
Authority: CN
Inventors: 车明
Original assignee: Qoros Automotive Co Ltd
Current assignee: Qoros Automotive Co Ltd
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2020-06-30

Abstract

The invention relates to a heat shield for an engine catalyst. The heat shield is provided with a special limit structure. The limiting structure can fix the heat insulation cotton to prevent the heat insulation cotton from shifting and can effectively compress the heat insulation cotton, so that the heat insulation cotton with larger thickness can be used in a narrow space of an engine compartment, and the heat insulation cover provided by the invention has an excellent heat insulation effect. In addition, the heat shield can be simultaneously provided with an upper heat shield and a lower heat shield, and a cavity is defined between the heat shields in different layers, so that the heat shield can have more excellent heat insulation effect. According to the heat shield provided by the invention, on the premise of ensuring that the heat shield can be assembled, the heat shield with larger thickness can be arranged to ensure the heat insulation effect, so that the temperature environment of each machine close to the catalytic converter can meet the design requirement.

Description

Heat shield for engine catalyst

Technical Field

The invention relates to an automobile heat insulation device in the field of automobile manufacturing, in particular to a heat insulation cover for an automobile engine catalyst.

Background

As is well known, a space in an engine compartment of a vehicle is narrow, heat generating devices such as an engine and a generator are simultaneously disposed therein, and in order to reduce mutual influence due to heat conduction between the heat generating devices, a heat insulating structure is generally provided on the outer periphery of the corresponding heat generating device. In order to solve the temperature control problem of the currently used automobile engine catalyst, a single-layer heat shield is usually arranged on the surface of the automobile engine catalyst, and heat insulation cotton is arranged in the heat shield. However, when the engine is a front exhaust type engine, the arrangement space in the engine room is made narrower due to the large volume of the catalyst, thereby causing the size, thickness, and the like of the heat shield to be limited. Moreover, the operating temperature of the catalyst is very high, so that the heat shield in the prior art cannot well meet the requirements of the automobile manufacturing field for heat insulation, and the working performance of peripheral parts is easily influenced. Meanwhile, the distance between the heat insulation structure of the catalytic converter in the prior art and other components in the engine compartment is small, so that the catalytic converter and peripheral components thereof are inconvenient to disassemble, inspect and maintain.

Disclosure of Invention

The present invention addresses the above problems in the prior art by providing a heat shield for an engine catalyst that includes an inlet cone end portion, a cylindrical portion, and an outlet cone end portion that are distributed in order from upstream to downstream in the direction of fluid flow. The heat shield has a lower heat shield. The lower heat shield extends from the upper edge of the cylindrical part to the tail end of the air outlet cone end along the longitudinal axis direction of the heat shield so as to wrap the cylindrical part and the air outlet cone end. The lower heat insulation cover comprises first heat insulation cotton and a first heat insulation plate which are sequentially arranged from inside to outside, wherein at least two rows of first concave parts which are distributed at certain intervals along the circumferential direction of the first heat insulation plate are arranged on the outer surface of the first heat insulation plate along the axial direction, and the first concave parts are used for pressing the first heat insulation cotton and fixing the first heat insulation cotton on an engine catalyst.

According to a preferred embodiment of the present invention, the first recess portion is provided at least at a position on the first heat insulation plate opposite to an upper edge of the cylinder part and at a position opposite to a lower edge of the cylinder part.

According to another preferred embodiment of the present invention, the first insulation board further comprises an inwardly concave pull groove, the cross section of the pull groove in the groove depth direction is gradually reduced, and the pull groove is used for limiting the first insulation cotton.

According to a preferred embodiment of the invention, the cross section of the pull groove is oblong or elliptical.

According to a preferred embodiment of the invention, the heat shield further comprises an upper heat shield partially enclosing the cylindrical portion and a lower portion of the inlet cone end at least on a side facing the generator.

According to a preferred embodiment of the present invention, the upper heat shield at least partially covers the lower heat shield, and includes a second heat shield, a second heat shield cotton, and a third heat shield, which are sequentially disposed from inside to outside, wherein the second heat shield includes a main body portion sleeved on the cylindrical portion, and wing-like extensions wrapping a portion of the intake cone end facing one side of the generator and extending outward along two sides of the main body portion, and the third heat shield includes a main body portion corresponding to the main body portion of the second heat shield, and wing-like extensions corresponding to the wing-like extensions of the second heat shield.

According to a preferred embodiment of the present invention, the first heat insulating board includes a plurality of first protrusions protruding outward for receiving projection welding nuts and provided with first through holes configured to allow bolts to pass therethrough when mounted;

the second heat insulation plate comprises a plurality of second bulges protruding outwards, the second bulges are configured to be matched with the first bulges, and the second bulges are provided with second through holes corresponding to the first through holes; and

the third heat insulation plate comprises a plurality of third through holes corresponding to the first through holes and the second through holes.

According to a preferred embodiment of the present invention, the third heat insulation board further includes a plurality of inwardly concave grooves corresponding to the first and second protrusions, and the third through hole is located in the grooves.

According to a preferred embodiment of the present invention, the second protrusion is configured to form a cavity between the first insulation board and the second insulation board.

According to a preferred embodiment of the present invention, at least two rows of second recessed portions circumferentially spaced at a certain distance are disposed on the outer surface of the main body portion of the second heat insulation board along the axial direction thereof, the upper edge of the wing-shaped extending portion of the second heat insulation board is provided with a step portion protruding outward, and the step portion, the second recessed portion and the third heat insulation board cooperate to limit the second heat insulation cotton together.

According to a preferred embodiment of the present invention, the main body portion of the second heat insulation board is provided with at least two second recesses along the longitudinal direction, and at least one of the at least two second recesses is provided with a third protrusion protruding outward, and the third heat insulation board has an opening to avoid the third protrusion.

According to a preferred embodiment of the present invention, the third insulation board has a third recess portion adapted to the second recess portion in shape and position, and the second recess portion and the third recess portion cooperate to press and limit the second insulation wool.

According to a preferred embodiment of the present invention, the first insulation panel includes two halved portions symmetrical in a longitudinal direction of the cylinder part, and/or the first insulation wool includes two halved portions symmetrical in a longitudinal direction of the cylinder part.

The heat shield for the engine catalyst according to the present invention is provided with a special limit structure. The limiting structure can fix the heat insulation cotton to prevent the heat insulation cotton from shifting and can effectively compress the heat insulation cotton, so that the heat insulation cotton with larger thickness can be used in a narrow space of an engine compartment, and the heat insulation cover provided by the invention has an excellent heat insulation effect. In addition, the heat shield can be simultaneously provided with an upper heat shield and a lower heat shield, and a cavity is defined between the heat shields in different layers, so that the heat shield can have more excellent heat insulation effect. According to the heat shield provided by the invention, on the premise of ensuring that the heat shield can be assembled, the heat shield with larger thickness can be arranged to ensure the heat insulation effect, so that the temperature environment of each machine close to the catalytic converter can meet the design requirement.

Drawings

For a better understanding of the above and other objects, features, advantages and functions of the present invention, reference should be made to the preferred embodiments illustrated in the accompanying drawings. Like reference numerals in the drawings refer to like parts. It will be appreciated by persons skilled in the art that the drawings are intended to illustrate preferred embodiments of the invention without any limiting effect on the scope of the invention, and that the various components in the drawings are not drawn to scale.

FIG. 1 is a schematic view of an engine compartment arrangement;

FIG. 2 is a schematic diagram of an engine catalyst;

FIG. 3 is a schematic view of the overall structure of a heat shield for an engine catalyst according to a preferred embodiment of the present invention;

4-5 are schematic structural views of the first heat insulation wool for an engine catalyst according to a preferred embodiment of the present invention;

FIGS. 6-7 are schematic views showing the overall structure of a first heat insulating board according to a preferred embodiment of the present invention;

FIG. 8 is a schematic view of the overall structure of a second heat shield according to a preferred embodiment of the present invention;

FIGS. 9-10 are schematic views showing the overall structure of a second heat insulating panel according to a preferred embodiment of the present invention;

11-12 are partial cross-sectional schematic views of a heat shield for an engine catalyst illustrating an upper heat shield having a three-layer structure and a lower heat shield having a two-layer structure in mating relationship with each other according to another preferred embodiment of the present invention, wherein FIGS. 12 and 13 show cross-sections of the heat shields in different positions, respectively;

fig. 13 to 14 are partial cross-sectional schematic views of a heat shield for an engine catalyst according to another preferred embodiment of the present invention, in which the upper heat shield is shown to have a three-layer structure, the lower heat shield has a two-layer structure, and both the two-layer structure of the lower heat shield are halved structures symmetrically arranged in the longitudinal axis direction.

Detailed Description

The engine catalyst heat shield of the present invention will be described in detail with reference to the accompanying drawings. What has been described herein is merely a preferred embodiment in accordance with the present invention and other ways of practicing the invention will occur to those skilled in the art and are within the scope of the invention.

In the following detailed description, directional terms, such as "left", "right", "upper", "lower", "front", "rear", "horizontal", "vertical", and the like, are used with reference to the orientation as illustrated in the drawings. Components of embodiments of the present invention can be positioned in a number of different orientations and the directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 1 is a schematic diagram showing an arrangement structure of an engine room. As shown in fig. 1, when the engine is in the form of a front exhaust, the engine compartment has various machines arranged in an arrangement as shown in fig. 1, in which a catalyst is disposed in close proximity to the engine, a generator, a compressor, an exhaust manifold of the engine, and the like. The exhaust gases of the engine still have a high temperature when entering the catalyst, which results in a high ambient temperature of the respective machine surrounding the catalyst. In order to ensure long-term normal operation of the machine around the catalytic converter, a heat shield having the inventive configuration is provided for this purpose.

Referring to FIG. 2, the overall structure of an engine catalyst is shown. The engine catalyst 1 includes an inlet cone end portion 11, a cylindrical portion 12, and an outlet cone end portion 13 in this order from upstream to downstream in a fluid flow direction. The central axes of the inlet cone end 11 and the outlet cone end 13 are in a perpendicular relationship.

Referring to FIG. 3, a partial schematic structural view of a heat shield for an engine catalyst according to a preferred embodiment of the present invention is shown. The heat shield has a lower heat shield. Referring to fig. 3 in conjunction with fig. 4-7, the lower heat shield extends in the longitudinal axis of the heat shield from the upper edge of the cylindrical portion 12 all the way to the end of the exit cone end 13 to wrap around the cylindrical portion 12 and the exit cone end 13. The lower heat insulation cover comprises a first heat insulation cotton 2 and a first heat insulation plate 4 which are sequentially arranged from inside to outside, wherein at least two rows of first

concave parts

31 and 32 which are distributed at certain intervals along the circumferential direction of the first heat insulation plate 4 are arranged on the outer surface of the first heat insulation plate 4 along the axial direction, and the first

concave parts

31 and 32 are used for pressing the first heat insulation cotton 2 and fixing the first heat insulation cotton on the engine catalyst 1. By means of the

first recesses

31, 32, the first heat insulation wool 2 can be compressed and limited significantly, whereby the heat insulation wool with a greater thickness can also be applied in a narrow space of the engine compartment, so as to ensure the heat insulation effect of the heat shield.

Referring to fig. 6 to 7 in conjunction with fig. 4 to 5, the

first depressions

31, 32 include at least a first depression 31 provided on the first heat shield plate 4 at a position opposite to the upper edge of the cylindrical part, and a first depression 32 provided at a position opposite to the lower edge of the cylindrical part.

Referring to fig. 6-7, in a preferred embodiment, the first insulating panel 4 may be further provided with an inwardly recessed pull groove 33. The cross section of the drawing groove 33 along the groove depth direction is gradually reduced, and the drawing groove is used for limiting the first heat insulation cotton 2. When the thermal insulation cotton compression device is used, the inner side end of the pull groove 33 can be directly abutted and pressed to prevent the thermal insulation cotton from moving under the high-frequency vibration regulation, and in addition, the arrangement mode that the cross section of the pull groove 33 in the groove depth direction is gradually reduced can also play a role in compressing the first thermal insulation cotton 2. Referring further to fig. 6-7, the cross-section of the pull grooves 33 may preferably be provided in an oblong or elliptical configuration. In the present invention, the term "oblong" is understood to mean a configuration in which two short sides of a rectangle are replaced with circular arcs.

Referring to fig. 8-12 in conjunction with fig. 13-14, in a preferred embodiment, the heat shield can be further configured to also include an upper heat shield. Wherein, the upper portion heat shroud is at least in part at the lower part of the partly parcel cylinder portion of one side towards the generator and air intake cone end.

For the upper heat shield, it wraps around at least a portion of the lower heat shield. In a preferred embodiment, the upper heat shield comprises a second heat insulation board 4, a second heat insulation cotton 5 and a third heat insulation board 6 which are arranged in sequence from inside to outside. As shown in fig. 8, the second heat shield plate 4 includes a main body portion 41 fitted over the cylindrical portion, and wing-like extension portions 42 surrounding a portion of the intake cone end facing the generator and extending outward along both sides of the main body portion. The third heat insulating board 6 includes a main body portion 61 corresponding to the main body portion 41 of the second heat insulating board 4 and wing-like extensions 62 corresponding to the wing-like extensions 42 of the second heat insulating board 4.

Referring to fig. 6-7 in conjunction with fig. 12, in accordance with a preferred embodiment of the present invention, the first heat shield 4 includes a plurality of outwardly projecting first tabs 34. The first projection 34 is for receiving a projection nut and is provided with a first through hole configured to allow a bolt to pass therethrough when mounted. Meanwhile, referring to fig. 8 in conjunction with fig. 11, the second heat shield plate 4 includes a plurality of second protrusions 43 protruding outward, the second protrusions 43 being configured to be able to fit the first protrusions 34, the second protrusions 43 being provided with second through holes corresponding to the first through holes. Referring to fig. 9 to 10 in combination with fig. 11, the third insulation board 6 includes a plurality of third through holes corresponding to the first through holes and the second through holes. The fastening bolt sequentially penetrates through the third through hole, the second through hole and the first through hole and is screwed into a projection welding nut fixed on the catalytic converter, and therefore the heat shield is fixed on the catalytic converter.

Referring to fig. 9-10 in conjunction with fig. 11, in accordance with a preferred embodiment of the present invention, the third heat shield 6 further includes a plurality of inwardly concave grooves 63, the grooves 63 correspond to the first protrusions 34 and the second protrusions 43, and the third through holes are located in the grooves 63. Thus, the head of the fastening bolt is not exposed from the outer surface of the heat shield after the fastening bolt is screwed into the projection nut.

Referring to fig. 11-12, in a preferred embodiment, the second protrusions 43 are configured to form a cavity 7 between the first and second

heat shield panels

4, 4. This can further improve the heat insulating effect of the heat shield.

Referring to fig. 8 in combination with fig. 9-10, 13-14, in a preferred embodiment, on the outer surface of the main body portion 41 of the second heat shield plate 4, at least two rows of a plurality of

second recesses

44, 45 are provided at a distance circumferentially along the axial direction thereof. The upper edge of the wing-shaped extension part 42 of the second heat insulation board 4 is provided with a step part 47 protruding outwards, and the step part 47, the second

concave parts

44 and 45 and the third heat insulation board 6 cooperate to limit the second heat insulation cotton 5 together. The second recesses 44, 45 accommodate the second insulating wool 5 at different circumferential positions (in the case of a configuration in which the main body of the catalyst is cylindrical, the second recesses can be understood to be located at different circumferential positions). The step part can press the second insulating wool 5 to the third insulating board 6, and starts fixing and compressing action on the second insulating wool 5.

The second recesses 44, 45 may be arranged at different circumferential positions, but may also take other forms, for example, referring to fig. 8, in a preferred embodiment, the main body portion of the second heat shield 4 may be provided with at least two

second recesses

44, 45 in the longitudinal direction, and at least one of the at least two

second recesses

44, 45 is provided with a third protrusion 46 protruding outward, and the third heat shield 6 has an opening to avoid the third protrusion 46. Therefore, the second heat insulation cotton 5 can be sleeved on the third convex part 46 and accommodated in the second concave part, and the fastening effect of the second heat insulation cotton is ensured.

Referring to fig. 8 in combination with fig. 9-10, 13-14, according to a preferred embodiment of the present invention, the third insulation panel 6 has

third recesses

64, 65 shaped and positioned to fit the second recesses 44, 45, and the second recesses 44, 45 and the

third recesses

64, 65 cooperate to press and restrain the second insulation wool 5.

Referring to fig. 13 to 14, according to a preferred embodiment of the present invention, the first insulation panel 4 includes two halved portions symmetrical in the longitudinal direction of the cylindrical part, and/or the first insulation batt 2 includes two halved portions symmetrical in the longitudinal direction of the cylindrical part. Therefore, the split parts of the first insulation board 4 and the second insulation board 4 can be fastened to each other by fastening bolts or the like, so that the first insulation board 4 can compress the first insulation wool 2 more densely, and the compressed amount of the first insulation wool 2 is increased.

The heat shield for the engine catalyst according to the present invention is provided with a special limit structure. The limiting structure can fix the heat insulation cotton to prevent the heat insulation cotton from shifting and can effectively compress the heat insulation cotton, so that the heat insulation cotton with larger thickness can be used in a narrow space of an engine compartment, and the heat insulation cover provided by the invention has an excellent heat insulation effect. In addition, the heat shield can be simultaneously provided with an upper heat shield and a lower heat shield, and the heat shields in different layers are provided with the cavities, so that the heat shield can have more excellent heat insulation effect. According to the heat shield provided by the invention, on the premise of ensuring that the heat shield can be assembled, the heat shield with larger thickness can be arranged to ensure the heat insulation effect, so that the temperature environment of each machine close to the catalytic converter can meet the design requirement.

For the heat shield of the present invention, each of the heat insulating panels may be a stainless steel plate, and the heat insulating wool may be made of a ceramic fiber material. For example, when the thermal insulation board is made of SUS430 stainless steel plate material with the thickness of 0.5mm, the original thickness of the first thermal insulation wool 2 is 10mm, and the original thickness of the second thermal insulation wool 5 is 6 mm; and the first heat insulation cotton 2 and the second heat insulation cotton 5 are respectively compressed to 5mm and 3mm, and the heat insulation test is carried out under the condition that the whole thickness of the heat insulation cover is set to be 12 mm. The temperature measured outside the range of 10mm from the outer boundary of the heat shield of the catalyst is below 80 ℃ in the possible operating conditions of the engine, thereby proving that the heat shield according to the invention can better meet the operating requirements of the machine located around the catalyst.

The scope of the invention is limited only by the claims. Persons of ordinary skill in the art, having benefit of the teachings of the present invention, will readily appreciate that alternative structures to the structures disclosed herein are possible alternative embodiments, and that combinations of the disclosed embodiments may be made to create new embodiments, which also fall within the scope of the appended claims.

Claims

1. A heat shield for an engine catalyst including an inlet cone end portion, a cylindrical portion and an outlet cone end portion distributed in sequence from upstream to downstream in a fluid flow direction, the heat shield comprising:

the lower heat shield extends from the upper edge of the cylindrical part to the tail end of the air outlet cone end part along the longitudinal axis direction of the heat shield so as to wrap the cylindrical part and the air outlet cone end part;

the engine catalyst is characterized in that the lower heat insulation cover comprises first heat insulation cotton and a first heat insulation plate which are sequentially arranged from inside to outside, wherein at least two rows of first concave parts which are distributed at certain intervals along the circumferential direction of the first heat insulation plate are arranged on the outer surface of the first heat insulation plate along the axial direction, and the first heat insulation cotton is pressed and fixed on an engine catalyst by the first concave parts.

2. The heat shield of claim 1, wherein the first recessed portion is provided at least at a position on the first heat shield plate opposite to an upper edge of the cylinder part and at a position opposite to a lower edge of the cylinder part.

3. The heat shield of claim 1, wherein the first heat shield plate further comprises an inwardly concave pull groove, the cross section of the pull groove in the groove depth direction is gradually reduced, and the pull groove is used for limiting the first heat shield cotton.

4. The heat shield of claim 3, wherein the cross-section of the pull groove is oblong or elliptical.

5. The heat shield of any of claims 1-4, further comprising an upper heat shield partially enclosing the cylindrical portion and a lower portion of the inlet cone end at least on a side facing a generator.

6. The heat shield according to claim 5, wherein the upper heat shield covers at least a portion of the lower heat shield, and comprises a second heat shield, a second heat shield cotton, and a third heat shield, wherein the second heat shield, the second heat shield cotton, and the third heat shield are sequentially arranged from inside to outside, the second heat shield comprises a main body portion sleeved on the cylindrical portion, a wing-shaped extension portion wrapping a portion of the inlet cone end facing one side of the generator and extending outwards along two sides of the main body portion, and the third heat shield comprises a main body portion corresponding to the main body portion of the second heat shield and a wing-shaped extension portion corresponding to the wing-shaped extension portion of the second heat shield.

7. The heat shield of claim 6, wherein the first heat shield comprises a plurality of outwardly projecting first bosses for receiving projection weld nuts and provided with first through holes configured to allow passage of bolts when installed;

8. The heat shield of claim 7, wherein the third heat shield further comprises a plurality of inwardly recessed grooves corresponding to the first and second projections, and the third apertures are located in the grooves.

9. The heat shield of claim 8, wherein the second tab is configured to form a cavity between the first and second heat shield panels.

10. The heat shield according to claim 6, wherein at least two rows of second recesses are formed on the outer surface of the main body portion of the second heat insulating board along the axial direction thereof, and the upper edge of the wing-like extension portion of the second heat insulating board is provided with a step portion protruding outward, and the step portion, the second recesses and the third heat insulating board cooperate to limit the second heat insulating cotton together.

11. The heat shield of claim 10, wherein the body portion of the second heat shield is provided with at least two second depressions along the longitudinal direction, and at least one of the at least two second depressions is provided with a third protrusion protruding outward, the third heat shield having an opening to avoid the third protrusion.

12. The heat shield of claim 11, wherein the third heat shield has a third recess shaped and positioned to fit the second recess, the second recess cooperating with the third recess to compress and retain the second insulation wool.

13. The heat shield according to claim 1, wherein the first heat insulating board comprises two halved portions symmetrical in a longitudinal direction of the cylinder part, and/or the first insulating wool comprises two halved portions symmetrical in a longitudinal direction of the cylinder part.