CN216157791U

CN216157791U - EGR cooler and engine

Info

Publication number: CN216157791U
Application number: CN202122241954.XU
Authority: CN
Inventors: 刘振; 刘伟
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2022-04-01
Anticipated expiration: 2031-09-15

Abstract

The utility model belongs to the technical field of engines, and discloses an EGR cooler and an engine, wherein the EGR cooler comprises a shell and at least one cooling pipe arranged in the shell, the cooling pipe is arranged along the axial direction of the shell and is used for allowing exhaust gas to circulate and exchanging heat between the exhaust gas and cooling liquid, the cooling pipe comprises a pipe body and at least one fin assembly, the fin assembly extends along the axial direction of the pipe body, the fin assembly comprises straight fins and wave-shaped fins, the straight fins and the wave-shaped fins are sequentially arranged in the pipe body along the flowing direction of the exhaust gas, and the head end of the wave-shaped fins is connected with the tail end of the straight fins. The combined structure of the straight fins at the front end and the wavy fins at the rear part of the cooling pipe of the EGR cooler weakens the heat exchange of the section at the front end of the cooling pipe, reduces the temperature at the front end of the cooling pipe, reduces the proportion of the boiling area to the water side area, reduces the thermal stress and strain, prolongs the thermal fatigue life and further improves the reliability of the EGR cooler.

Description

EGR cooler and engine

Technical Field

The utility model belongs to the technical field of engines, and particularly relates to an EGR cooler and an engine.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

The general whole section fin of current EGR cooler all is the wave type, can't effectively reduce thermal stress, through using the higher material of temperature resistant, improves intensity, improves thermal fatigue life, and the cost is higher. For example, the cost of 316L stainless steel is increased by 10% -20% to 444 stainless steel.

SUMMERY OF THE UTILITY MODEL

The utility model aims to at least solve the problem of high temperature resistance and high cost of the fins of the EGR cooler in the prior art, and the aim is realized by the following technical scheme:

the utility model provides an EGR cooler, which comprises a shell and at least one cooling pipe arranged in the shell, wherein the cooling pipe is arranged along the axial direction of the shell and is used for allowing exhaust gas to circulate and exchanging heat between the exhaust gas and cooling liquid, the cooling pipe comprises a pipe body and at least one fin assembly, the fin assembly extends along the axial direction of the pipe body, the fin assembly comprises straight fins and wave-shaped fins, the straight fins and the wave-shaped fins are sequentially arranged in the pipe body along the flowing direction of the exhaust gas, and the head ends of the wave-shaped fins are connected with the tail ends of the straight fins.

The combined structure of the straight fins at the front end and the wavy fins at the rear part of the cooling pipe of the EGR cooler weakens the heat exchange of the section at the front end of the cooling pipe, reduces the temperature at the front end of the cooling pipe, reduces the proportion of the boiling area to the water side area, reduces the thermal stress and strain, prolongs the thermal fatigue life, greatly improves the reliability of the EGR cooler under the condition of sacrificing small heat exchange capacity, reduces the risk of cracking and falling of the air side fins at the air inlet end, and prevents the clamping stagnation of an EGR valve, the damage of a turbocharger turbine and the like.

In addition, the EGR cooler according to the present invention may also have the following additional technical features:

in some embodiments of the present invention, the cooling tube includes a plurality of the straight fins and a plurality of the wavy fins, the plurality of the straight fins are arranged at intervals in the vertical direction in the cooling tube, and the plurality of the wavy fins are arranged at intervals in the vertical direction in the cooling tube.

In some embodiments of the present invention, the plurality of straight fins are formed by sheet metal bending, and the plurality of wave-shaped fins are formed by sheet metal bending.

In some embodiments of the utility model, the EGR cooler comprises a plurality of cooling tubes distributed in a rectangular array in a radial direction of the housing.

In some embodiments of the present invention, the EGR cooler further includes a main plate, and the cooling pipe is connected to the housing through the main plate.

In some embodiments of the present invention, the main plate and the cooling pipe are connected by welding or screwing, and the main plate and the housing are connected by welding or screwing.

In some embodiments of the present invention, the straight fins and the wave-shaped fins are connected to the tube body by welding.

A second aspect of the utility model proposes an engine having an EGR cooler according to the first aspect of the utility model.

The engine according to the second aspect of the present invention has the same advantageous effects as the EGR cooler according to the first aspect of the present invention, and will not be described in detail herein.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:

fig. 1 schematically shows a schematic partly in section of an EGR cooler according to an embodiment of the utility model;

fig. 2 schematically shows a structural view of a partial structure of an EGR cooler according to an embodiment of the present invention.

Fig. 3 schematically shows a structural view of a straight fin of an EGR cooler according to an embodiment of the present invention.

The reference symbols in the drawings denote the following:

10: a housing, 11: cooling pipe, 12: straight fin, 13: wavy fin, 14: a main board.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, an element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "inner", "side", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 to 3, a first aspect of the present invention provides an EGR cooler, which includes a housing 10 and at least one cooling tube 11 disposed in the housing 10, the cooling tube 11 is disposed along an axial direction of the housing 10, the cooling tube 11 is configured to circulate exhaust gas and exchange heat between the exhaust gas and a cooling liquid, the cooling tube 11 includes a tube body and at least one fin assembly, the fin assembly extends along the axial direction of the tube body, the fin assembly includes straight fins 12 and wave-shaped fins 13, the straight fins 12 and the wave-shaped fins 13 are sequentially disposed in the tube body along a flow direction of the exhaust gas, and a head end of the wave-shaped fins 13 is connected to a tail end of the straight fins 12.

It should be noted that the housing 10 may be cylindrical or square-cylindrical, but is not limited thereto, the cooling tube 11 may be a rectangular tube or a circular tube, the radial section of the fin assembly is adapted to the cooling tube 11, the straight fins 12 are straight fins, and the wavy fins 13 are wavy in the exhaust gas flowing direction.

The combined structure of the straight fins 12 at the front end of the cooling pipe 11 and the wavy fins 13 at the rear part of the cooling pipe 11 of the EGR cooler weakens the heat exchange of the small section at the front end of the cooling pipe 11, reduces the temperature at the front end of the cooling pipe 11, reduces the proportion of the boiling area to the water side area, reduces the thermal stress and strain, prolongs the thermal fatigue life, greatly improves the reliability of the EGR cooler under the condition of sacrificing small heat exchange capacity, reduces the risk of cracking and falling of the air side fins at the air inlet end, and prevents the clamping stagnation of an EGR valve, the damage of a turbocharger turbine and the like.

Simulated contrast map of EGR cooler of the present invention versus prior art solutions

In some embodiments of the present invention, the cooling tube 11 includes a plurality of straight fins 12 and a plurality of corrugated fins 13, the plurality of straight fins 12 being vertically spaced apart within the cooling tube 11, and the plurality of corrugated fins 13 being vertically spaced apart within the cooling tube 11. The straight fins 12 and the wavy fins 13 can be fixed with the inner wall of the cooling pipe 11 through welding of the two ends of the straight fins and the wavy fins 13, the straight fins 12 and the wavy fins 13 can be formed in a metal plate bending forming mode, the connecting structure is more reliable, and the cost is lower.

In some embodiments of the utility model, the EGR cooler comprises a plurality of cooling tubes 11, the plurality of cooling tubes 11 being distributed in a rectangular array in the radial direction of the housing 10. For example, the plurality of cooling tubes 11 are arranged in the housing 10 in a plurality of rows, so that the heat exchange area between the exhaust gas and the cooling liquid is larger and the heat exchange efficiency is higher.

In some embodiments of the present invention, the EGR cooler further includes a main plate 14, the cooling pipe 11 is connected to the housing 10 through the main plate 14, the main plate 14 serves to connect and support the cooling pipe 11, on the other hand, the EGR cooler may be provided with main plates 14 at the head and tail ends of the cooling pipe 11 to be connected to the housing 10, the cooling pipe 11 between the two main plates 14 forms a cooling liquid channel with the space between the housing 10, the main plates 14 serve to seal, and the shape of the main plates 14 is adapted according to the arrangement of the cooling pipe 11 and the space between the cooling pipe 11 and the housing 10.

Specifically, the main plate 14 is connected with the cooling pipe 11 through welding or screwing, and the main plate 14 is connected with the casing 10 through welding or screwing, so that the cost is low and the reliability is good.

In some embodiments of the present invention, the straight fins 12 and the wavy fins 13 are welded to the tube, which is low in cost and reliable.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a EGR cooler, its characterized in that includes the casing and locates at least one cooling tube in the casing, the cooling tube is followed the axial direction of casing sets up, the cooling tube is used for supplying the waste gas circulation and carries out the heat transfer with waste gas and coolant liquid, the cooling tube includes body and at least one fin subassembly, the fin subassembly is followed the axial extension of body, the fin subassembly includes straight fin and wave fin, the inside of body is equipped with in proper order along the flow direction of waste gas the straight fin with the wave fin, the head end of wave fin with the trailing end connection of straight fin.

2. The EGR cooler of claim 1 wherein said cooling tube includes a plurality of said straight fins and a plurality of said corrugated fins, said plurality of said straight fins being vertically spaced within said cooling tube, said plurality of said corrugated fins being vertically spaced within said cooling tube.

3. The EGR cooler of claim 2 wherein the plurality of straight fins are formed by sheet metal bending and the plurality of wave fins are formed by sheet metal bending.

4. The EGR cooler of claim 1 wherein the EGR cooler comprises a plurality of cooling tubes distributed in a rectangular array in a radial direction of the housing.

5. The EGR cooler of claim 1 further comprising a main plate through which the cooling tube is connected with the housing.

6. The EGR cooler according to claim 5, wherein the main plate is connected to the cooling pipe by welding or screwing, and the main plate is connected to the housing by welding or screwing.

7. The EGR cooler according to any one of claims 1 through 6, wherein the straight fins and the wavy fins are joined to the tube body by welding.

8. An engine characterized by having an EGR cooler according to any one of claims 1 to 7.