CN216044092U - Heavy EGR cooler with damping structure - Google Patents
Heavy EGR cooler with damping structure Download PDFInfo
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- CN216044092U CN216044092U CN202122771595.9U CN202122771595U CN216044092U CN 216044092 U CN216044092 U CN 216044092U CN 202122771595 U CN202122771595 U CN 202122771595U CN 216044092 U CN216044092 U CN 216044092U
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- damping structure
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Abstract
A heavy EGR cooler with a damping structure is characterized in that a diffusion piece is connected with a heat exchange tube through a tube plate, and a corrugated tube is arranged between the diffusion piece and a stop ring; a first damping part serving as a first damping structure is arranged on the periphery of the corrugated pipe; the first damping part is provided with a thick port end and a thin port end, the thick port end contacts the stop ring, and the thin port end is sleeved on the periphery of the diffusion part; and a second damping structure is arranged between the heat exchange tube and the inner wall of the shell and comprises a supporting sheet or a second damping piece, the supporting sheet is connected with the heat exchange tube, the second damping piece is connected with the supporting sheet, and the second damping piece is contacted with the inner wall of the shell. In consideration of improving the reliability of the EGR cooler, the first damping structure and the second damping structure do work to overcome resistance in the vibration process, and energy brought by initial vibration is consumed, so that the amplitude is attenuated continuously; the vibration resistance of the corrugated pipe and the heat exchange core body is improved by reducing the amplitude, and the integral reliability of the EGR cooler is improved.
Description
Technical Field
The utility model relates to a heavy EGR cooler with a damping structure, and belongs to the technical field of engines.
Background
EGR cooling system can reduce NO of automobile exhaustxAnd discharging, namely reintroducing a small amount of exhaust gas into the intake valve at a higher speed of the automobile, thereby realizing exhaust gas recirculation. Temperature of exhaust gas NOxEmission, NO to engine the lower the temperature of the exhaust gasxThe better the inhibition. The EGR cooler can reduce the temperature of the exhaust gas entering the cylinder, which is beneficial for the thermal load of the engine, and can reduce the engine temperature. With the implementation of relevant environmental protection policies, air quality improvement has obvious effects. Nevertheless, the current situation is not optimistic, especially in areas where PM2.5 is frequent and more severe, and there is a far way away from environmental targets.
At the present stage, the key points of emission reduction and control in the fourteen-five planning are heavy-duty diesel engines, and EGR coolers applied to the heavy-duty diesel engines have high requirements on heat exchange performance, large volume, large vibration, large stress of expansion with heat and contraction with cold and higher requirements on reliability; it is a common practice to compensate for thermal expansion and contraction deformation with a bellows that, due to its thin wall, has a good compensation for deformation while having poor vibration resistance, resulting in a reduced reliability of the overall EGR cooler. Accordingly, there is a need for a heavy duty EGR cooler solution that improves overall reliability.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model provides a heavy EGR cooler with a damping structure, which improves the vibration resistance of a corrugated pipe and a heat exchange core body by reducing the amplitude and improves the overall reliability of the EGR cooler.
In order to achieve the above purpose, the utility model provides the following technical scheme: a heavy EGR cooler with a damping structure comprises a shell and a heat exchange core body, wherein the heat exchange core body is arranged in the shell, a stop ring is formed at the air inlet end of the shell, and the heat exchange core body comprises a diffusion piece, a tube plate and a heat exchange tube;
the diffusion piece is connected with the heat exchange tube through the tube plate, and a corrugated tube is arranged between the diffusion piece and the barrier ring;
a first damping part serving as a first damping structure is arranged on the periphery of the corrugated pipe; the first damping part is provided with a thick opening end and a thin opening end, the thick opening end contacts the stop ring, and the thin opening end is sleeved on the periphery of the diffusion part;
the heat exchange tube with be equipped with second damping structure between the inner wall of casing, second damping structure includes backing sheet or second damping piece, the backing sheet is connected the heat exchange tube, second damping piece is connected the backing sheet, second damping piece contact the inner wall of casing.
Preferably, the diffuser is provided with a fixed step at one end close to the corrugated pipe, and the narrow-mouth end is sleeved on the periphery of the fixed step.
As a preferable scheme of the heavy-duty EGR cooler having the damping structure, the heat exchange tube is conducted inside the diffuser, and an inner diameter of one end of the diffuser, which is close to the corrugated tube, is smaller than an inner diameter of one end of the diffuser, which is close to the heat exchange tube.
As a preferable scheme of the heavy-duty EGR cooler with the damping structure, the first damping member is a conical spring, the conical spring is provided with the thick opening end and the thin opening end, the thick opening end contacts the stop ring, and the thin opening end is sleeved on the periphery of the diffusion member.
As a preferable aspect of the heavy EGR cooler having the damping structure, the first damping member has a predetermined compression amount.
As a preferable scheme of the heavy-duty EGR cooler having the damping structure, an end of the support sheet is bent in a direction away from the heat exchange pipe, and an adjustment hole is formed at the end of the support sheet;
the end of the second damping member is inserted into the adjustment hole.
As a preferable aspect of the heavy-duty EGR cooler having the damping structure, the second damping member is a plate spring, and the center of the second damping member has an arcuate curvature.
As the preferable scheme of the heavy EGR cooler with the damping structure, the second damping structures are distributed on the heat exchange tubes in a radial symmetrical mode.
Preferably, the heavy-duty EGR cooler with a damping structure is provided with at least two groups of second damping structures in the axial direction of the heat exchange pipe.
As a preferable mode of the heavy EGR cooler having the damping structure, the second damping member has a preset adjustment distance in an axial direction of the heat exchange pipe through the adjustment hole.
The utility model has the following advantages: the heat exchange device is provided with a shell and a heat exchange core body, wherein the heat exchange core body is arranged in the shell, a stop ring is formed at the air inlet end of the shell, and the heat exchange core body comprises a diffusion piece, a tube plate and a heat exchange tube; the diffusion piece is connected with the heat exchange tube through a tube plate, and a corrugated tube is arranged between the diffusion piece and the barrier ring; a first damping part serving as a first damping structure is arranged on the periphery of the corrugated pipe; the first damping part is provided with a thick port end and a thin port end, the thick port end contacts the stop ring, and the thin port end is sleeved on the periphery of the diffusion part; and a second damping structure is arranged between the heat exchange tube and the inner wall of the shell and comprises a supporting sheet or a second damping piece, the supporting sheet is connected with the heat exchange tube, the second damping piece is connected with the supporting sheet, and the second damping piece is contacted with the inner wall of the shell. In consideration of improving the reliability of the EGR cooler, a first damping structure is arranged outside the corrugated pipe, a second damping structure is additionally arranged outside the heat exchange core body, the first damping structure and the second damping structure do work to overcome resistance in the vibration process, energy brought by initial vibration is consumed, and the amplitude is attenuated continuously; the vibration resistance of the corrugated pipe and the heat exchange core body is improved by reducing the amplitude, and the integral reliability of the EGR cooler is improved; the exhaust gas recirculation system is suitable for exhaust gas recirculation in an engine system, and is particularly suitable for medium and heavy diesel engines and natural gas engines.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.
FIG. 1 is a schematic illustration of a heavy duty EGR cooler having a damping structure provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a bellows perimeter structure in a heavy duty EGR cooler having a damping structure in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a second damping arrangement for a heavy duty EGR cooler having a damping arrangement in accordance with an embodiment of the present invention;
FIG. 4 is a schematic top view of a second damping arrangement for a heavy duty EGR cooler having a damping arrangement provided in an embodiment of the present invention.
In the figure, 1, a housing; 2. a heat exchange core body; 3. a blocking ring; 4. a diffuser; 5. a tube sheet; 6. a heat exchange pipe; 7. a bellows; 8. a first damping member; 9. a thick opening end; 10. a thin-opening end; 11. a support sheet; 12. a second damping member; 13. and (5) fixing the step.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the utility model will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the utility model and that it is not intended to limit the utility model to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, 2, 3 and 4, the present invention provides a heavy EGR cooler with a damping structure, comprising a housing 1 and a heat exchange core 2, wherein the heat exchange core 2 is arranged inside the housing 1, a blocking ring 3 is formed at an air inlet end of the housing 1, and the heat exchange core 2 comprises a diffuser 4, a tube plate 5 and a heat exchange tube 6;
the diffusion piece 4 is connected with the heat exchange tube 6 through the tube plate 5, and a corrugated tube 7 is arranged between the diffusion piece 4 and the barrier ring 3;
a first damping part 8 serving as a first damping structure is arranged on the periphery of the corrugated pipe 7; the first damping part 8 is provided with a thick mouth end 9 and a thin mouth end 10, the thick mouth end 9 is contacted with the barrier ring 3, and the thin mouth end 10 is sleeved on the periphery of the diffusion part 4;
the heat exchange tube 6 with be equipped with second damping structure between the inner wall of casing 1, second damping structure includes backing sheet 11 or second damping piece 12, backing sheet 11 is connected the heat exchange tube 6, second damping piece 12 is connected backing sheet 11, second damping piece 12 contact the inner wall of casing 1.
With reference to fig. 2, in this embodiment, a fixed step 13 is disposed at one end of the diffuser 4 close to the corrugated tube 7, and the thin-mouth end 10 is sleeved on the periphery of the fixed step 13. The first damping part 8 adopts a conical spring which is provided with a thick opening end 9 and a thin opening end 10, the thick opening end 9 is contacted with the barrier ring 3, and the thin opening end 10 is sleeved on the periphery of the diffusion part 4. The first damping member 8 has a predetermined compression amount.
Specifically, the wide end 9 and the narrow end 10 of the first damping member 8 are relative concepts, and the specific thickness is not limited, and taking the first damping member 8 as a conical spring, the first damping member must have a wide end 9 and a narrow end 10, and the wide end 9 and the narrow end 10 are a gradual transition process.
Specifically, the outer diameter of the fixing step 13 is determined according to the inner diameter of the narrow end 10 of the conical spring, so that the conical spring can be closely contacted and connected with the fixing step 13, and the effect of fixing the conical spring is achieved.
Specifically, conical spring gives certain compression capacity when initial assembly, because forced vibration can wholly appear in heat transfer core 2 and bellows 7, if resonance appears, fracture can appear in bellows 7, and under the long-time vibration, fatigue failure also can appear in bellows 7. And after increasing conical spring, at the vibration in-process, conical spring can utilize the restoring force of self to hinder heat transfer core 2's displacement and remove, and conical spring under expend with heat and contract with cold effect, the shrink can appear and have certain damping force, under the combined action of restoring force and damping force, conical spring can do the vibration of reducing amplitude, the amplitude can be littleer and littleer, make the vibration in bellows 7 and heat transfer core 2 self rigidity requirement scope, play the effect that improves anti vibration performance, thereby improve EGR cooler's overall reliability.
In this embodiment, the heat exchange tube 6 is conducted inside the diffuser 4, and the inner diameter of the end of the diffuser 4 close to the corrugated tube 7 is smaller than the inner diameter of the end of the diffuser 4 close to the heat exchange tube 6.
Specifically, diffusion piece 4 belongs to prior art itself, and diffusion piece 4 is in EGR cooler's inlet end, and the inside of diffusion piece 4 is the space of a round platform form, can play the effect of waste gas diffusion, makes waste gas enter into heat exchange tube 6 inside and carries out the heat transfer.
With reference to fig. 3 and 4, in the present embodiment, the end of the supporting plate 11 is bent away from the heat exchange tube 6, and the end of the supporting plate 11 is formed with an adjusting hole; the end of the second damping member 12 is inserted into the adjustment hole. The second damping member 12 is a plate spring, and the center of the second damping member 12 has an arcuate curvature. The second damping structures are symmetrically distributed on the heat exchange tube 6 in the radial direction. And at least two groups of second damping structures are arranged in the axial direction of the heat exchange tube 6. The second damper 12 has a preset adjustment distance along the axial direction of the heat exchange tube 6 through the adjustment hole.
Specifically, the second damping structure outside the heat exchange core body 2 is that a support sheet 11 is arranged outside the heat exchange tube 6, the support sheet 11 is welded with the heat exchange tube, a plate spring is arranged outside the support sheet 11, the plate spring is designed longitudinally, and two ends of the plate spring are connected with the support sheet 11. Adopt interference fit between leaf spring and the casing 1, under EGR cooler vibration load effect, the leaf spring can take place to warp, extends to both ends, and backing sheet 11 has spacingly through the regulation hole, and restriction leaf spring warp too big, and have relative slip and produce the friction between the backing sheet 11, can produce certain resistance, impel the vibration decay, can play the cushioning effect.
Specifically, the interference fit between the supporting sheet 11 and the shell 1 can transmit the force and the moment of the heat exchange tube 6 to the shell 1, so as to disperse the stress of the heat exchange core 2. Two groups of second damping structures are symmetrically designed in the circumferential direction of one EGR cooler, and two or more groups of second damping structures can be designed in the axial direction according to the length of the EGR cooler and the working condition of an engine.
Specifically, the cooperation of the first damping structure and the second damping structure better realizes that the vibration resistance of the corrugated pipe 7 and the heat exchange core 2 is improved by reducing the amplitude, and the overall reliability effect of the EGR cooler is improved.
In summary, the utility model is provided with a shell 1 and a heat exchange core 2, wherein the heat exchange core 2 is arranged inside the shell 1, a blocking ring 3 is formed at the air inlet end of the shell 1, and the heat exchange core 2 comprises a diffusion piece 4, a tube plate 5 and a heat exchange tube 6; the diffusion piece 4 is connected with a heat exchange tube 6 through a tube plate 5, and a corrugated tube 7 is arranged between the diffusion piece 4 and the barrier ring 3; a first damping part 8 serving as a first damping structure is arranged on the periphery of the corrugated pipe 7; the first damping part 8 is provided with a thick mouth end 9 and a thin mouth end 10, the thick mouth end 9 contacts the barrier ring 3, and the thin mouth end 10 is sleeved on the periphery of the diffusion part 4; a second damping structure is arranged between the heat exchange tube 6 and the inner wall of the shell 1, the second damping structure comprises a supporting sheet 11 or a second damping piece 12, the supporting sheet 11 is connected with the heat exchange tube 6, the second damping piece 12 is connected with the supporting sheet 11, and the second damping piece 12 is contacted with the inner wall of the shell 1. The conical spring gives certain compression capacity when initial assembly, because forced vibration can wholly appear in heat transfer core 2 and bellows 7, if resonance appears, fracture can appear in bellows 7, and under the long-time vibration, fatigue failure also can appear in bellows 7. And after increasing conical spring, at the vibration in-process, conical spring can utilize the restoring force of self to hinder heat transfer core 2's displacement and remove, and conical spring under expend with heat and contract with cold effect, the shrink can appear and have certain damping force, under the combined action of restoring force and damping force, conical spring can do the vibration of reducing amplitude, the amplitude can be littleer and littleer, make the vibration in bellows 7 and heat transfer core 2 self rigidity requirement scope, play the effect that improves anti vibration performance, thereby improve EGR cooler's overall reliability. The second damping structure outside the heat exchange core body 2 is that a support sheet 11 is arranged outside the heat exchange tube 6, the support sheet 11 is welded with the heat exchange tube, a plate spring is arranged outside the support sheet 11, the plate spring is designed longitudinally, and two ends of the plate spring are connected with the support sheet 11. Adopt interference fit between leaf spring and the casing 1, under EGR cooler vibration load effect, the leaf spring can take place to warp, extends to both ends, and backing sheet 11 has spacingly through the regulation hole, and restriction leaf spring warp too big, and have relative slip and produce the friction between the backing sheet 11, can produce certain resistance, impel the vibration decay, can play the cushioning effect. The supporting sheet 11 and the shell 1 are in interference fit, so that the force and the moment of the heat exchange tube 6 can be transmitted to the shell 1, and the effect of dispersing the stress of the heat exchange core body 2 is achieved. Two groups of second damping structures are symmetrically designed in the circumferential direction of one EGR cooler, and two or more groups of second damping structures can be designed in the axial direction according to the length of the EGR cooler and the working condition of an engine. The cooperation of first damping structure and second damping structure has better realization and has improved the anti-vibration performance of bellows 7 and heat exchange core 2 through reducing the amplitude, improves the holistic reliability effect of EGR cooler. In consideration of improving the reliability of the EGR cooler, a first damping structure is arranged outside the corrugated pipe 7, a second damping structure is added outside the heat exchange core body 2, the first damping structure and the second damping structure do work in order to overcome resistance in the vibration process, energy brought by initial vibration is consumed, and the amplitude is attenuated continuously; the vibration resistance of the corrugated pipe 7 and the heat exchange core 2 is improved by reducing the amplitude, and the integral reliability of the EGR cooler is improved; the exhaust gas recirculation system is suitable for exhaust gas recirculation in an engine system, and is particularly suitable for medium and heavy diesel engines and natural gas engines.
Although the utility model has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.
Claims (10)
1. A heavy EGR cooler with a damping structure comprises a shell (1) and a heat exchange core body (2), wherein the heat exchange core body (2) is arranged inside the shell (1), and a blocking ring (3) is formed at the air inlet end of the shell (1), and the heavy EGR cooler is characterized in that the heat exchange core body (2) comprises a diffusion piece (4), a tube plate (5) and a heat exchange tube (6);
the diffusion piece (4) is connected with the heat exchange tube (6) through the tube plate (5), and a corrugated tube (7) is arranged between the diffusion piece (4) and the blocking ring (3);
a first damping part (8) serving as a first damping structure is arranged on the periphery of the corrugated pipe (7); the first damping part (8) is provided with a thick opening end (9) and a thin opening end (10), the thick opening end (9) is contacted with the barrier ring (3), and the thin opening end (10) is sleeved on the periphery of the diffusion part (4);
the heat exchange tube (6) with be equipped with second damping structure between the inner wall of casing (1), second damping structure includes backing sheet (11) or second damping piece (12), backing sheet (11) are connected heat exchange tube (6), second damping piece (12) are connected backing sheet (11), second damping piece (12) contact the inner wall of casing (1).
2. A heavy EGR cooler with damping structure according to claim 1, characterized in that the diffuser (4) is provided with a fixed step (13) at the end close to the bellows (7), and the thin mouth end (10) is fitted around the periphery of the fixed step (13).
3. A heavy EGR cooler with damping structure according to claim 1 characterized in that the interior of the diffuser (4) conducts the heat exchange tubes (6), and the inner diameter of the diffuser (4) near the end of the bellows (7) is smaller than the inner diameter of the diffuser (4) near the end of the heat exchange tubes (6).
4. A heavy EGR cooler with damping structure according to claim 1 characterized in that said first damping member (8) is a conical spring having said wide open end (9) and said narrow open end (10), said wide open end (9) contacting said blocking ring (3) and said narrow open end (10) being fitted around the periphery of said diffuser member (4).
5. A heavy duty EGR cooler with a damping arrangement according to claim 4 characterized in that said first damping member (8) has a predetermined amount of compression.
6. A heavy EGR cooler having a damping structure according to claim 1, characterized in that the end of the supporting sheet (11) is bent away from the heat exchange tube (6), and the end of the supporting sheet (11) is formed with an adjustment hole;
the end of the second damping member (12) is inserted into the adjustment hole.
7. The heavy duty EGR cooler with a damping structure according to claim 6, characterized in that said second damping member (12) is a plate spring, and the center of said second damping member (12) has an arcuate curvature.
8. A heavy EGR cooler with damping structure according to claim 7, characterized in that the second damping structure is distributed radially and symmetrically to the heat exchange tubes (6).
9. A heavy EGR cooler with damping structure according to claim 8 characterized in that the heat exchange tubes (6) are provided axially with at least two sets of said second damping structure.
10. A heavy duty EGR cooler with a damping structure according to claim 6 characterized in that said second damping member (12) has a preset adjustment distance in the axial direction of said heat exchange tube (6) through said adjustment hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122771595.9U CN216044092U (en) | 2021-11-12 | 2021-11-12 | Heavy EGR cooler with damping structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122771595.9U CN216044092U (en) | 2021-11-12 | 2021-11-12 | Heavy EGR cooler with damping structure |
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| Publication Number | Publication Date |
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| CN216044092U true CN216044092U (en) | 2022-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122771595.9U Active CN216044092U (en) | 2021-11-12 | 2021-11-12 | Heavy EGR cooler with damping structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113915033A (en) * | 2021-11-12 | 2022-01-11 | 北京美联桥科技集团有限公司 | Heavy EGR cooler with damping structure |
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2021
- 2021-11-12 CN CN202122771595.9U patent/CN216044092U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113915033A (en) * | 2021-11-12 | 2022-01-11 | 北京美联桥科技集团有限公司 | Heavy EGR cooler with damping structure |
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