CN210343539U

CN210343539U - Tube core assembly of cooler in EGR system

Info

Publication number: CN210343539U
Application number: CN201921034608.0U
Authority: CN
Inventors: 赵镛国
Original assignee: Zhangjiagang Korens Auto Parts Co ltd
Current assignee: Zhangjiagang Korens Auto Parts Co ltd
Priority date: 2019-07-04
Filing date: 2019-07-04
Publication date: 2020-04-17
Anticipated expiration: 2029-07-04

Abstract

The utility model discloses a tube core subassembly of cooler in EGR system, include the body of rectangle and set up in the inside radiating fin of body, the one end of body is the inlet end, and the other end is for giving vent to anger the end, radiating fin welds in the inside of body, and radiating fin's first end corresponds with the inlet end, and radiating fin's second end corresponds with the end of giving vent to anger, trapezoidal reciprocating structure about radiating fin becomes on the cross section, radiating fin's upper and lower surface be the plane and with the body welding, and the distance between radiating fin's first end and the inlet end of body is L, and the thickness of this body is H, and H is less than or equal to L and is less than or equal to 2H. The tube core assembly can effectively avoid the phenomenon that the temperature of the air inlet end is too high, and avoid the phenomenon that parts are damaged due to the fact that the local temperature is too high.

Description

Tube core assembly of cooler in EGR system

Technical Field

The utility model relates to a pipe core subassembly for use on the cooler in the EGR system.

Background

EGR (EGR) is a system that reduces NOx by recirculating a portion of the Exhaust Gas to the intake system, thereby increasing the concentration of CO2 in the intake air and lowering the temperature of the combustion chamber. A cooler in an EGR system of an automobile is a device for cooling exhaust gas.

And present cooler includes the shell and sets up in the inside tube core body of shell, the tube core body includes the tube core subassembly of left fixed plate, right fixed plate and a plurality of mutual superpose, be provided with a plurality of interlude hole on left fixed plate and the right fixed plate respectively, the left end of tube core subassembly insert the interlude of left fixed plate downthehole and with left fixed plate welded fastening, the right-hand member of tube core subassembly insert the interlude of right fixed plate downthehole and with right fixed plate welded fastening, the hole of tube core subassembly has constituted waste gas flow channel, the space has constituted cooling water flow channel between the tube core subassembly, be provided with on the shell with cooling water flow channel's water inlet and delivery port, with air inlet and the gas outlet of waste gas flow channel intercommunication.

However, the target pipe core assembly has a big problem that: the cooler cools the exhaust temperature of about 700 ℃ discharged by an engine to 150-200 ℃, the exhaust contains sulfur component to form sulfuric acid in the heat exchange process, the corrosion is easy to cause, especially, the radiating fins are arranged inside the existing pipe core assembly, the air inlet end parts of the radiating fins extend to the left fixing plate, and the connecting parts of the pipe body and the left fixing plate are not cooled by cooling water, so that the end parts of the pipe body are overheated, the fluctuation phenomenon that the cooling water boils at the corresponding parts can occur after the pipe body is overheated, and the thermal stress can be greatly generated, thereby causing the problem of part damage.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the tube core assembly of the cooler in the EGR system can effectively avoid the phenomenon that the temperature of an air inlet end is too high, and avoid the phenomenon that parts are damaged due to the fact that the local temperature is too high.

In order to solve the technical problem, the technical scheme of the utility model is that: the tube core assembly of the cooler in the EGR system comprises a rectangular tube body and radiating fins arranged inside the tube body, wherein one end of the tube body is an air inlet end, the other end of the tube body is an air outlet end, the radiating fins are welded inside the tube body, the first ends of the radiating fins correspond to the air inlet end, the second ends of the radiating fins correspond to the air outlet end, the radiating fins form a reciprocating structure with an upper trapezoid and a lower trapezoid on the cross section, the upper surface and the lower surface of each radiating fin are planes and are welded with the tube body, the distance between the first ends of the radiating fins and the air inlet end of the tube body is L, the thickness of the tube body is H, and the H is not less than L and not more.

Preferably, the first end of the heat dissipation fin is further provided with a heat dissipation extension portion extending towards the air inlet end of the tube body, and the heat dissipation extension portion is not in contact with the inner wall of the tube body.

As a preferable scheme, the heat dissipation fin includes an upper and lower extension section extending in an up-and-down direction, an upper horizontal section connecting upper ends of the upper and lower extension sections, and a lower horizontal section connecting lower ends of the upper and lower extension sections, the upper horizontal section and the lower horizontal section are both welded on an inner wall of the pipe body, and the heat dissipation extension section is disposed on the upper and lower extension section.

Preferably, the heat dissipation extension is a straight plate.

Preferably, the straight plate part and the upper and lower extension sections are welded together.

As a preferable scheme, the straight plate part and the upper and lower extension sections are integrally formed, and the straight plate part is formed after the upper horizontal section and the lower horizontal section of the first end cutting part of the heat dissipation fin with the reciprocating structure of the upper and lower trapezoids.

Preferably, the second end of the heat dissipation fin is flush with the air outlet end of the tube body.

After the technical scheme is adopted, the utility model discloses an effect is: the heat radiating fins are of a reciprocating structure with an up-down trapezoidal reciprocating shape on the cross section, the upper and lower surfaces of the heat radiating fins are both flat surfaces and are welded with the tube body, the distance between the first ends of the heat radiating fins and the air inlet end of the tube body is L, the thickness of the tube body is H, the H is not more than L and not more than 2H, a moving blank space is reserved between the first ends of the heat radiating fins and the air inlet end of the tube body, after the high-temperature waste gas enters the tube body from the air inlet end of the tube body, at the moment, the blank space does not cause rapid heat transfer between the waste gas and the tube body, so that the temperature of the air inlet end of the tube body is not too high, when the waste gas contacts the heat radiating fins, the heat transfer area is increased, so that the heat can be transferred to the tube body, the cooling liquid flowing in the cooler takes away the heat of the tube body, the cooling of the waste gas, the phenomena of overheating fluctuation and thermal stress concentration of the cooling liquid at the air inlet end of the cooler are prevented.

And because the first ends of the radiating fins are also provided with radiating extension parts extending towards the air inlet ends of the tube bodies, and the radiating extension parts are not contacted with the inner walls of the tube bodies, the radiating extension parts can increase the area of the radiating fins, and meanwhile, when the exhaust gas at the air inlet ends is contacted with the radiating extension parts, the radiating extension parts do not directly transfer heat to the air inlet ends of the tube bodies but transfer the heat to the radiating fins downstream, so that the heat conduction efficiency between the exhaust gas and the radiating fins can be increased, but the phenomenon of overheating of the air inlet ends of the tube bodies can not occur.

And because the radiating fin comprises an upper and lower extending section extending in the vertical direction, an upper horizontal section connecting the upper ends of the upper and lower extending sections and a lower horizontal section connecting the lower ends of the upper and lower extending sections, the upper horizontal section and the lower horizontal section are both welded on the inner wall of the pipe body, and the radiating extending sections are arranged on the upper and lower extending sections, the welding between the radiating fin and the pipe body is firmer, and the position of the radiating extending sections is also reasonable and is not directly contacted with the pipe body.

And because the straight plate part and the upper and lower extension sections are integrally formed, the straight plate part is formed after the upper horizontal section and the lower horizontal section of the first end cutting part of the radiating fin with the reciprocating structure of the upper and lower trapezoids are formed, the straight plate part is more simply formed, meanwhile, the straight plate part and the upper and lower extension sections are integrated, welding spots are reduced, and the gas flows more smoothly.

And because the second ends of the radiating fins are flush with the air outlet end of the tube body, the temperature of the air outlet end is lower, and therefore the radiating fins can better support the air outlet end of the tube body.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a block diagram of a prior art tube core mounted on a cooler;

FIG. 2 is a cross-sectional view of one of the core assemblies of the present invention;

FIG. 3 is a perspective view of another embodiment of a heat sink fin for a tube core assembly;

in the drawings: 1. a housing; 11. a coolant inlet; 12. a coolant outlet; 13. a left fixing plate; 2. a pipe body; 3. a heat dissipating fin; 31. an upper horizontal section; 32. a heat dissipation extension part; 33. an upper and lower extension section; 34. a lower horizontal section.

Detailed Description

The present invention will be described in further detail with reference to the following examples.

As shown in fig. 1 to 3, a tube core assembly of a cooler in an EGR system, which is stacked to form a tube core body, has a structure substantially the same as that of fig. 1, and includes a housing 1, a left fixing plate 13 and a right fixing plate, the tube core body is fixed between the left fixing plate 13 and the right fixing plate, the tube core body is located in the housing 1, and the housing 1 is provided with a cooling liquid inlet 11 and a cooling liquid outlet 12. The cooling liquid exchanges heat with the high temperature exhaust gas in the wick assembly, thereby achieving cooling.

The tube core assembly comprises a rectangular tube body 2 and radiating fins 3 arranged inside the tube body 2, one end of the tube body 2 is an air inlet end, the other end of the tube body is an air outlet end, the radiating fins 3 are welded inside the tube body 2, the first ends of the radiating fins 3 correspond to the air inlet end, the second ends of the radiating fins 3 correspond to the air outlet end, the radiating fins 3 form a reciprocating structure with an upper trapezoid and a lower trapezoid on the cross section, the upper surfaces and the lower surfaces of the radiating fins 3 are planes and are welded with the tube body 2, the distance between the first ends of the radiating fins 3 and the air inlet end of the tube body 2 is L, the thickness of the tube body 2 is H, and the H is not less than L and not more. By adopting the distance L, enough blank areas are arranged between the radiating fins 3 and the tube body 2, and the tube body of the blank areas can be contacted with the cooling liquid to reduce the temperature, so that the heat conduction brightness of the air inlet end is reduced, the heat exchange of the cooling liquid is continuous, the problem of heat stress concentration is avoided, and meanwhile, the phenomenon of local boiling of the cooling liquid close to the air inlet end can not occur.

As shown in fig. 3, in the figure, the heat dissipation fin 3 adopts another structure form, and the first end of the heat dissipation fin 3 is further provided with a heat dissipation extension portion 32 extending toward the air inlet end of the tube body 2, and the heat dissipation extension portion 32 is not in contact with the inner wall of the tube body 2. The heat dissipation fin 3 comprises an upper extension section 33 extending in the up-down direction, an upper horizontal section 31 connecting the upper end of the upper extension section 33 and a lower horizontal section 34 connecting the lower end of the upper extension section 33, the upper horizontal section 31 and the lower horizontal section 34 are both welded on the inner wall of the pipe body 2, and the heat dissipation extension portion 32 is arranged on the upper extension section 33. The heat dissipation extension 32 is a straight plate portion. And the straight plate part and the upper and lower extension sections 33 are welded. In the present embodiment, it is preferable that the straight plate portion is integrally formed with the upper and lower extension portions 33, and the straight plate portion is formed after the first end cutting portion of the heat dissipation fin 3 of the reciprocating structure of the upper and lower trapezoidal reciprocates to the upper horizontal section 31 and the lower horizontal section 34. And the second ends of the radiating fins 3 are flush with the air outlet end of the tube body 2.

In this embodiment, the area of the heat dissipating fin 3 can be increased by the heat dissipating extension 32, and meanwhile, when the exhaust gas at the air inlet end contacts the heat dissipating extension 32, the heat dissipating extension 32 does not directly transfer the heat to the air inlet end of the tube body 2, and does not transfer the heat to the left fixing plate 13, but transfers the heat to the heat dissipating fin 3 downstream, so that the heat conduction efficiency between the exhaust gas and the heat dissipating fin 3 can be increased, but the air inlet end of the tube body 2 cannot be overheated.

The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and alterations made to the technical solution of the present invention without departing from the spirit of the present invention are intended to fall within the scope of the present invention defined by the claims.

Claims

The tube core assembly of the cooler in the EGR system comprises a rectangular tube body and radiating fins arranged inside the tube body, and is characterized in that: the heat dissipation structure is characterized in that one end of the tube body is an air inlet end, the other end of the tube body is an air outlet end, the heat dissipation fins are welded inside the tube body, the first ends of the heat dissipation fins correspond to the air inlet end, the second ends of the heat dissipation fins correspond to the air outlet end, the heat dissipation fins are of a reciprocating structure with an upper trapezoid and a lower trapezoid on the cross section, the upper surfaces and the lower surfaces of the heat dissipation fins are both planes and are welded with the tube body, the distance between the first ends of the heat dissipation fins and the air inlet end of the tube body is L, the thickness of the tube body is H.
2. The tube core assembly of a cooler in an EGR system of claim 1, wherein: the first ends of the radiating fins are also provided with radiating extending parts extending towards the air inlet ends of the tube bodies, and the radiating extending parts are not contacted with the inner walls of the tube bodies.
3. The tube core assembly of a cooler in an EGR system of claim 2, wherein: the radiating fins comprise upper and lower extending sections extending in the vertical direction, upper horizontal sections connected to the upper ends of the upper and lower extending sections, and lower horizontal sections connected to the lower ends of the upper and lower extending sections, the upper horizontal sections and the lower horizontal sections are welded on the inner wall of the pipe body, and the radiating extending sections are arranged on the upper and lower extending sections.
4. The tube core assembly of a cooler in an EGR system of claim 3, wherein: the heat dissipation extension part is a straight plate part.
5. The tube core assembly of a cooler in an EGR system of claim 4, wherein: the straight plate part and the upper and lower extension sections are welded.
6. The tube core assembly of a cooler in an EGR system of claim 5, wherein: the straight plate part and the upper and lower extension sections are integrally formed, and the straight plate part is formed after the upper horizontal section and the lower horizontal section of the first end cutting part of the heat dissipation fin of the upper and lower trapezoidal reciprocating structure.
7. The tube core assembly of a cooler in an EGR system of claim 6, wherein: and the second ends of the radiating fins are flush with the air outlet end of the tube body.