Heavy Truck Engine Aftertreatment Heat Insulation System

Abstract

The present invention relates to a post-treatment heat insulation system for a heavy truck engine. The post-treatment heat insulation system includes an outer heat insulation cover and an inner heat insulation cover. An outer cover air inlet is provided on the outer heat insulation cover, and an inner cover air inlet is provided on the inner heat insulation cover. External air enters the first cavity formed by the enclosure of the outer heat insulation cover and the inner heat insulation cover through the outer cover air inlet, and then enters the second cavity formed by the enclosure of the inner heat insulation cover through the inner cover air inlet, exchanges heat with the post-treatment device inside the inner heat insulation cover, and finally is discharged from the inner cover air outlet at the bottom of the inner heat insulation cover. The outer heat insulation cover and the inner heat insulation cover of the present invention enclose two inner and outer cavities (the first cavity and the second cavity). The post-treatment device is arranged in the second cavity. External air flows from the first cavity into the second cavity, exchanges heat with the post-treatment device in the second cavity, and then flows out from the air outlet at the bottom, adjusting the working environment temperature of the post-treatment device to make it work at a reasonable temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive aftertreatment, and particularly to an aftertreatment heat insulation system for a heavy truck engine. Background Art

[0002] The existing aftertreatment system of heavy truck engines is directly exposed outside the whole vehicle. Since its temperature is very high, when people or foreign objects come into contact with it, it is easy to scald people or damage objects. When the outdoor temperature is very low and the vehicle is running fast, due to the external low-temperature environment, the temperature of the aftertreatment drops to a level where it cannot work properly (the temperature required for the catalytic reaction of exhaust gas in the aftertreatment is about 300°), which affects the vehicle emission level. Summary of the Invention

[0003] To solve the above problems, the present invention provides an aftertreatment heat insulation system for a heavy truck engine, which can effectively adjust the working environment temperature of the aftertreatment device and make it work within a reasonable range.

[0004] The technical solution adopted by the present invention is: an aftertreatment heat insulation system for a heavy truck engine, characterized in that: it includes an outer heat insulation cover and an inner heat insulation cover, the inner heat insulation cover is arranged inside the outer heat insulation cover, and the aftertreatment device is arranged inside the inner heat insulation cover; an outer cover air inlet is provided on the outer heat insulation cover, and an inner cover air inlet is provided on the inner heat insulation cover; external air enters the first cavity formed by the enclosure of the outer heat insulation cover and the inner heat insulation cover through the outer cover air inlet, and then enters the second cavity formed by the enclosure of the inner heat insulation cover through the inner cover air inlet, exchanges heat with the aftertreatment device inside the inner heat insulation cover, and finally is discharged from the inner cover air outlet at the bottom of the inner heat insulation cover.

[0005] Preferably, the outer heat insulation cover includes an outer upper side plate, an outer left side plate, an outer right side plate, an outer front side plate and an outer rear side plate. The outer upper side plate, the outer left side plate, the outer right side plate, the outer front side plate and the outer rear side plate enclose a cavity structure with an open bottom, and outer cover air inlets are provided on the outer upper side plate, the outer left side plate, the outer right side plate and the outer front side plate.

[0006] Preferably, the outer upper side plate, the outer left side plate and the outer right side plate all open outward and contract inward at the bottom. When the vehicle is running, the air flow flows from front to back, so that the outer upper side plate, the outer left side plate, the outer right side plate and the outer front side plate form a positive pressure area, and the bottom air outlet forms a negative pressure area. Arranging the air inlets in the positive pressure area is beneficial to the inflow of external air.

[0007] Preferably, heat insulation layers are provided on the inner sides of the outer upper side plate, the outer left side plate, the outer right side plate, the outer front side plate and the outer rear side plate. This can prevent scalding of personnel or objects when the temperature of the aftertreatment device is too high.

[0008] Preferably, the inner heat shield includes an inner upper side plate, inner left side plate, inner right side plate, inner front side plate and inner rear side plate. The inner upper side plate, inner left side plate, inner right side plate, inner front side plate and inner rear side plate enclose a cavity structure with an open bottom, and inner air inlet openings are provided on the inner upper side plate, inner left side plate, inner right side plate, inner front side plate and inner rear side plate.

[0009] Preferably, the bottoms of the inner upper side plate, inner left side plate, inner right side plate, inner front side plate and inner rear side plate are connected to the bottoms of the corresponding outer upper side plate, outer left side plate, outer right side plate, outer front side plate and outer rear side plate through drain plates. Arranging the drain openings in the negative pressure area is beneficial to the drainage of water.

[0010] Preferably, the drain plates enclose a conical structure with a high upper part and a low bottom part, and a narrow upper part and a wide lower part.

[0011] Preferably, drain holes are provided on the drain plates.

[0012] Preferably, post-treatment pipe holes are provided on both the outer heat shield and the inner heat shield.

[0013] Preferably, an air intake adjustment mechanism is provided on the outer heat shield. When the temperature inside the inner heat shield is too high, the air intake adjustment mechanism is controlled to increase the air flow speed and the amount of air, taking away the heat inside the inner heat shield and reducing the temperature. When the temperature inside the inner heat shield is too low, the air intake adjustment mechanism is controlled to reduce the air flow speed and the amount of air, reducing the loss of heat inside the inner heat shield.

[0014] The beneficial effects achieved by the present invention are as follows: The outer heat shield and the inner heat shield of the present invention enclose two inner and outer cavities (the first cavity and the second cavity). The post-treatment device is arranged in the second cavity. External air flows from the first cavity into the second cavity, exchanges heat with the post-treatment device in the second cavity, and then flows out from the air outlet at the bottom, adjusting the working environment temperature of the post-treatment device to make it work at a reasonable temperature. The present invention has the following advantages:

[0015] 1. The outer upper side plate, outer left side plate and outer right side plate all open outward, and the bottom contracts inward. When the vehicle is running, the air flow flows from front to back, making the outer upper side plate, outer left side plate, outer right side plate and outer front side plate form a positive pressure area, and the bottom air outlet forms a negative pressure area. Arranging the air intake opening in the positive pressure area is beneficial to the inflow of external air. Arranging the drain opening in the negative pressure area is beneficial to the drainage of water.

[0016] 2. Good heat insulation effect. Heat insulation layers are arranged inside both the outer heat shield and the inner heat shield, avoiding scalding of personnel or articles caused by too high temperature of the post-treatment device.

[0017] 3. Improve the working efficiency of post-treatment. When the vehicle is in a low-temperature environment, the intake air regulating mechanism in the post-treatment heat insulation system reduces or even closes the entry of external air into the inner heat insulation cover to keep the post-treatment warm. Description of the Drawings

[0018] Figures 1-3 Structural schematic diagram of the present invention;

[0019] Figure 4 Structural schematic diagram of the outer heat insulation cover;

[0020] Figure 5 Structural schematic diagram of the inner heat insulation cover;

[0021] Figure 6 Structural schematic diagram of the drainage plate;

[0022] Figure 7 Structural schematic diagram of the intake air regulating mechanism;

[0023] Figure 8 Structural schematic diagram of the post-treatment device;

[0024] In the figure: 1. Outer heat insulation cover; 11. Outer upper side plate; 12. Outer front side plate; 13. Outer rear side plate; 14. Outer left side plate; 15. Outer right side plate; 16. Outer air intake; 2. Inner heat insulation cover; 21. Inner upper side plate; 22. Inner front side plate; 23. Inner rear side plate; 24. Inner left side plate; 25. Inner right side plate; 26. Inner air intake; 3. Post-treatment device; 31. Post-treatment pipe hole; 32. Post-treatment pipe; 4. Drainage plate; 41. Drainage hole; 5. Intake air regulating mechanism; 51. Cylinder body; 52. Rotating shaft; 53. Blade. Detailed Description of the Invention

[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] As Figures 1-6 shown, a heat insulation system for the post-treatment of a heavy truck engine according to the present invention includes an outer heat insulation cover 1 and an inner heat insulation cover 2. The inner heat insulation cover 2 is arranged inside the outer heat insulation cover 1, and a post-treatment device 3 is arranged inside the inner heat insulation cover 2; an outer cover air inlet 16 is provided on the outer heat insulation cover 1, and an inner cover air inlet 26 is provided on the inner heat insulation cover 2; external air enters the first cavity formed by the enclosure of the outer heat insulation cover 1 and the inner heat insulation cover 2 through the outer cover air inlet 16, and then enters the second cavity formed by the enclosure of the inner heat insulation cover 2 through the inner cover air inlet 26, exchanges heat with the post-treatment device 3 inside the inner heat insulation cover 2, and finally is discharged from the inner cover air outlet at the bottom of the inner heat insulation cover 2. By forming an air flow channel with the outer heat insulation cover 1 and the inner heat insulation cover 2, the environmental working temperature of the post-treatment device 3 inside the inner heat insulation cover 2 can be effectively adjusted by adjusting the air flow rate and the inflow amount of the channel, so that it works at a reasonable temperature; through the outer heat insulation cover 1 and the inner heat insulation cover 2, the post-treatment device 3 can also be isolated from the external environment to prevent personnel or objects from being scalded.

[0029] Combined with Figure 4 shown, in this embodiment, the outer heat insulation cover 1 includes an outer upper side plate 11, an outer left side plate 14, an outer right side plate 15, an outer front side plate 12, and an outer rear side plate 13. The outer upper side plate 11, the outer left side plate 14, the outer right side plate 15, the outer front side plate 12, and the outer rear side plate 13 enclose a cavity structure with an open bottom. Outer cover air inlets 16 are provided on the outer upper side plate 11, the outer left side plate 14, the outer right side plate 15, and the outer front side plate 12, and the outer rear side plate 13 remains closed.

[0030] In this embodiment, the outer upper side plate 11, the outer left side plate 14, and the outer right side plate 15 all open outward (i.e., gradually incline outward from front to back), and the bottom contracts inward. When the vehicle is running, the air flow moves from front to back, so that the outer upper side plate 11, the outer left side plate 14, the outer right side plate 15, and the outer front side plate 12 all form a positive pressure area, and the bottom air outlet forms a negative pressure area. Arranging the air inlet in the positive pressure area is beneficial to the inflow of external air.

[0031] In this embodiment, heat insulation layers are provided on the inner sides of the outer upper side plate 11, the outer left side plate 14, the outer right side plate 15, the outer front side plate 12, and the outer rear side plate 13. To avoid scalding of personnel or objects when the temperature of the post-treatment device is too high.

[0032] In this embodiment, the inner heat shield 2 includes an inner upper side plate 21, an inner left side plate 24, an inner right side plate 25, an inner front side plate 22, and an inner rear side plate 23. The inner upper side plate 21, the inner left side plate 24, the inner right side plate 25, the inner front side plate 22, and the inner rear side plate 23 enclose a cavity structure with an open bottom. Inner air inlet openings 26 are provided on the inner upper side plate 21, the inner left side plate 24, the inner right side plate 25, the inner front side plate 22, and the inner rear side plate 23, and its bottom opening serves as the inner shield air outlet.

[0033] In this embodiment, between the bottoms of the inner upper side plate 21, the inner left side plate 24, the inner right side plate 25, the inner front side plate 22, and the inner rear side plate 23 and the bottoms of the corresponding outer upper side plate 11, outer left side plate 14, outer right side plate 15, outer front side plate 12, and outer rear side plate 13 are all connected by a drain plate 4. Arranging the drain opening in the negative pressure area is conducive to the drainage of water.

[0034] In this embodiment, the drain plate 4 encloses a conical structure with a high upper part and a low bottom part, and a narrow upper part and a wide lower part, so that the drainage area forms a negative pressure area.

[0035] In this embodiment, drain holes 41 are provided on the drain plate 4.

[0036] In this embodiment, post-treatment pipe holes 31 are provided on both the outer heat shield 1 and the inner heat shield 2. As shown in combination Figure 6 , the post-treatment device 3 is installed inside the inner heat shield 2, and the post-treatment pipe 32 passes through the front and rear post-treatment pipe holes 31 and is connected to an external device.

[0037] In this embodiment, an air intake adjustment mechanism 5 is provided on the inner heat shield 2. The air intake adjustment mechanism 5 includes a cylinder body 51, a rotating shaft 52, and blades 53. The cylinder body 51 is a through hole and corresponds to the inner shield air inlet opening 26. The diameter of the blades 53 is the same as the diameter of the cylinder body 51. The rotating shaft 52 is arranged in the middle of the cylinder body 51 and can rotate. The blades 53 are connected to the rotating shaft 52. The blades 53 rotate with the rotating shaft 52 to control the opening size of the inner shield air inlet opening 26. The rotation angle and speed of the rotating shaft 52 are controlled by the vehicle's ECU.

[0038] External air enters the cavities of the outer heat shield and the inner heat shield through the air intake holes on the positive pressure area, passes through the ECU-controlled air intake adjustment mechanism on the inner heat shield, enters the inner heat shield, and is discharged from the lower part of the inner heat shield. The lower cavity of the inner heat shield is in the negative pressure area. Air is sucked into the cavity due to the pressure difference between the positive and negative pressure areas and is discharged from the lower cavity of the inner heat shield.

[0039] In the present invention, heat-insulating materials (such as aluminum foil) are arranged inside the outer heat-insulating cover 1 and the inner heat-insulating cover 2. When the temperature of the post-treatment device 3 is too high, external air enters the inner heat-insulating cover 2 to cool the post-treatment device 3, and the heat on the surface of the post-treatment device 3 is carried away by the air flow; since heat-insulating materials are arranged inside the outer heat-insulating cover 1 and the inner heat-insulating cover 2, which play a heat-insulating role, the outer surface temperature of the outer heat-insulating cover 1 is relatively low (equivalent to the external environment temperature) and will not cause damage to people and articles.

[0040] The post-treatment device 3 of a heavy-duty truck engine needs a certain temperature to work properly, generally in the range of about 300°. A temperature sensor is arranged inside the inner heat-insulating cover 2. When the temperature inside the inner heat-insulating cover 2 is too high, that is, when the outer surface temperature of the post-treatment device 3 is too high, the temperature value of the temperature sensor is transmitted to the ECU, and the ECU controls the rotating shaft 52 in the intake air regulating mechanism 5. The rotating shaft 52 rotates to increase the angle of the blade 53, increase the air flow speed and the air volume, carry away the heat inside the inner heat-insulating cover 2, and reduce the temperature. When the temperature inside the inner heat-insulating cover 2 is too low, the ECU controls the rotating shaft 52 in the intake air regulating mechanism 5. The rotating shaft 52 rotates to reduce the angle of the blade 53, reduce the air flow speed and the air volume, and maintain the heat inside the inner heat-insulating cover.

[0041] Water in the air may enter the cavity formed by the outer heat-insulating cover 1 and the inner heat-insulating cover 2 through the outer cover air inlet 16 on the outer heat-insulating cover 1 and is discharged through the drain port 41 on the drain plate 4. The drain port 41 is in a negative pressure area, which is convenient for water to be discharged.

[0042] When the temperature inside the inner heat-insulating cover is too high, the air flow speed and the air volume are increased by controlling the intake air regulating mechanism to carry away the heat inside the inner heat-insulating cover and reduce the temperature; when the temperature inside the inner heat-insulating cover is too low, the air flow speed and the air volume are reduced by controlling the intake air regulating mechanism to reduce the heat loss inside the inner heat-insulating cover.

[0043] The above shows and describes the basic principle and main structural features of the present invention. The present invention is not limited by the above examples. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

[0044] Here, it should be noted that the description of the above technical solutions is exemplary. This specification can be embodied in different forms and should not be construed as limited to the technical solutions described herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are only limited by the scope of the claims.

[0045] Finally, it should be noted that the above embodiments are only relatively representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and there can be many variations. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A post-treatment heat insulation system for a heavy truck engine, characterized in that: It includes an outer heat insulation cover and an inner heat insulation cover. The inner heat insulation cover is arranged inside the outer heat insulation cover, and a post-treatment device is arranged inside the inner heat insulation cover. An outer cover air inlet is provided on the outer heat insulation cover, and an inner cover air inlet is provided on the inner heat insulation cover. External air enters the first cavity formed by the enclosure of the outer heat insulation cover and the inner heat insulation cover through the outer cover air inlet, and then enters the second cavity formed by the enclosure of the inner heat insulation cover through the inner cover air inlet, exchanges heat with the post-treatment device inside the inner heat insulation cover, and finally is discharged from the inner cover air outlet at the bottom of the inner heat insulation cover. The outer heat insulation cover and the inner heat insulation cover enclose two inner and outer cavities. The post-treatment device is arranged in the second cavity. External air flows from the first cavity into the second cavity, exchanges heat with the post-treatment device in the second cavity, and then flows out from the inner cover air outlet at the bottom to adjust the working environment temperature of the post-treatment device. The outer heat insulation cover includes an outer upper side plate, an outer left side plate, an outer right side plate, an outer front side plate, and an outer rear side plate. The outer upper side plate, the outer left side plate, the outer right side plate, the outer front side plate, and the outer rear side plate enclose a cavity structure with an open bottom. Outer cover air inlets are provided on the outer upper side plate, the outer left side plate, the outer right side plate, and the outer front side plate. The outer upper side plate, the outer left side plate, and the outer right side plate all open outward and gradually incline outward from front to back. Heat insulation layers are provided on the inner sides of the outer upper side plate, the outer left side plate, the outer right side plate, the outer front side plate, and the outer rear side plate. The inner heat insulation cover includes an inner upper side plate, an inner left side plate, an inner right side plate, an inner front side plate, and an inner rear side plate. The inner upper side plate, the inner left side plate, the inner right side plate, the inner front side plate, and the inner rear side plate enclose a cavity structure with an open bottom. Inner cover air inlets are provided on the inner upper side plate, the inner left side plate, the inner right side plate, the inner front side plate, and the inner rear side plate. The bottoms of the inner left side plate, the inner right side plate, the inner front side plate, and the inner rear side plate are all connected to the bottoms of the corresponding outer left side plate, outer right side plate, outer front side plate, and outer rear side plate through drain plates. An air intake adjustment mechanism is provided on the inner heat insulation cover. When the temperature inside the inner heat insulation cover is too high, the air intake adjustment mechanism is controlled to increase the air flow speed and the air volume to take away the heat inside the inner heat insulation cover and reduce the temperature. When the temperature inside the inner heat insulation cover is too low, the air intake adjustment mechanism is controlled to reduce the air flow speed and the air volume to reduce the heat loss inside the inner heat insulation cover. The drain plates enclose a tapered structure with a narrow upper part and a wide lower part, making the drainage area form a negative pressure area.

2. The post-treatment heat insulation system for heavy truck engines according to claim 1, characterized in that: Drainage holes are provided on the drain plates.

3. The post-treatment heat insulation system for a heavy truck engine according to claim 1, characterized in that: Post-treatment pipe holes are provided on both the outer heat insulation cover and the inner heat insulation cover.

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