EGR cooler

Abstract

The utility model provides an EGR cooler which comprises a cooler shell, a water inlet pipe and a water outlet pipe and further comprises a gas inlet pipe, a corrugated pipe, a pre-cooling pipe, a heat insulation pipe, a ceramic lantern ring, a main board and a heat dissipation core. The air inlet pipe, the corrugated pipe, the pre-cooling pipe and the cooler shell are sequentially welded and fixed, the heat insulation pipe is arranged on the inner side of the corrugated pipe, one end is welded with the air inlet pipe, and the other end is supported and fixed with the corrugated pipe through the ceramic lantern ring. A mainboard is arranged on the inner side of the pre-cooling pipe, one side of the mainboard is connected with a heat dissipation core, and the other side of the mainboard is arranged in a sliding groove of the ceramic lantern ring in a sliding mode. According to the EGR cooler, by arranging the ceramic lantern ring, the situation that axial dislocation possibly generated due to thermal expansion and cold contraction or vibration influences the EGR cooler can be avoided. Meanwhile, the ceramic lantern ring is located between the heat insulation pipe and the corrugated pipe, the heat insulation pipe is supported in the radial direction, due to the sliding grooves, the ceramic lantern ring can still relatively slide in the axial direction, and the vibration resistance of the heat insulation pipe is improved through the ceramic lantern ring.

Description

Technical Field

[0001] The utility model relates to the technical field of coolers, in particular to an EGR cooler. Background Art

[0002] EGR (Exhaust Gas Recirculation) is the abbreviation of exhaust gas recirculation. Because the exhaust temperature of the engine is relatively high, and the engine intake system has certain temperature restrictions, cooling the exhaust gas is also an important step when gradually increasing the use rate of EGR.

[0003] Patent No. 202221670457.X discloses an exhaust gas intake end structure and an EGR cooler, comprising a first intake section, a bellows, a second intake section and a main board connected in sequence, and the first intake section, the bellows, the second intake section and the main board together form an intake channel, the exhaust gas intake end structure also includes a partition assembly, the partition assembly is arranged in the intake channel to divide the intake channel into a first channel and a second channel, an insulation tube is provided on the side of the bellows close to the intake channel, the insulation tube is sealedly connected to the first intake section by brazing, and one end of the insulation tube close to the second intake section is radially staggered from the second intake section.

[0004] In the above technology, only one end of the heat insulation tube is fixedly connected to the air intake pipe. When the heat insulation tube is long, it may fail due to vibration during operation. At the same time, the shell and the heat dissipation core may be axially misaligned due to thermal expansion and contraction or vibration, which will affect the entire cooler. Utility Model Content

[0005] In view of the above problems, the utility model provides an EGR cooler.

[0006] An EGR cooler comprises a cooler shell, a water inlet pipe and a water outlet pipe. The EGR cooler also comprises an intake pipe, a bellows, a precooling pipe, an insulation pipe, a ceramic sleeve, a main board and a heat dissipation core. The intake pipe, the bellows, the precooling pipe and the cooler shell are welded and fixed in sequence. The insulation pipe is arranged on the inner side of the bellows, one end of which is welded and connected to the intake pipe, and the other end is supported and fixed to the bellows through the ceramic sleeve. A main board is arranged on the inner side of the precooling pipe, one side of the main board is connected to the heat dissipation core, and the other side is slidably arranged in the slide groove of the ceramic sleeve.

[0007] In a preferred embodiment, the mainboard may include an integrally formed C-shaped connecting portion, a Z-shaped connecting portion, and a cylindrical portion, the C-shaped connecting portion is assembled and connected to the heat dissipation core, and the cylindrical portion is slidably connected in the slide groove.

[0008] In a preferred embodiment, the precooling tube, the Z-shaped connecting portion and the cylindrical portion form an annular precooling cavity.

[0009] In a preferred embodiment, the main board further comprises two partitions arranged in parallel, the two partitions are vertically fixedly arranged in the cylindrical portion, and ventilation pipes are evenly installed on the two partitions.

[0010] In a preferred embodiment, the diameter of the ventilation tube at both sides is larger than the diameter in the middle.

[0011] In a preferred embodiment, the ceramic ferrule is connected to the thermal insulation tube via a clamp ring.

[0012] In a preferred embodiment, a plurality of baffles are further arranged in the cooler housing, and the heat dissipation core passes through the baffles.

[0013] 1. The EGR cooler of this application is provided with a ceramic collar. When the EGR cooler is axially dislocated due to thermal expansion and contraction or vibration, the heat dissipation core is fixed away from one side of the intake pipe, and the other side moves axially. At this time, the heat dissipation core can drive the main board to slide relatively in the groove of the ceramic collar, thereby avoiding the influence of axial dislocation caused by thermal expansion and contraction or vibration on the EGR cooler. At the same time, the ceramic collar is located between the insulation tube and the corrugated tube, and plays a radial supporting role for the insulation tube. Due to the existence of the groove, the axial direction can still slide relatively. The use of the ceramic collar improves the vibration resistance of the insulation tube.

[0014] 2. The EGR cooler of the present application can improve the cooling efficiency of the main board by setting a pre-cooling chamber, avoid the thermal expansion of the main board and the cold water. At the same time, the Z-shaped connection structure of the main board can improve the deformation resistance of the main board. In addition, there is a gap between the main board and the pre-cooling pipe, and the periphery of the main board is not constrained by the cooler shell, which can meet the radial thermal expansion needs of the main board. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other characteristics, features and advantages of the present invention will become clear by reading the following description of the exemplary embodiments with reference to the accompanying drawings. The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments of the present invention and are used together with the description to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 Appearance diagram of the EGR cooler of the utility model;

[0017] Figure 2 A cross-sectional view of the EGR cooler of the utility model;

[0018] Figure 3 A cross-sectional view of the intake pipe and main board of the EGR cooler of the utility model;

[0019] Figure 4 A cross-sectional view of the EGR cooler of the utility model at position AA;

[0020] Figure 5 An enlarged view of the position of EGR cooler B of the utility model.

[0021] In the figure: 10, cooler shell; 11, water inlet pipe; 12, water outlet pipe; 20, air inlet pipe; 21, bellows; 22, precooling pipe; 23, insulation pipe; 30, ceramic sleeve; 40, main board; 13, heat dissipation core; 31, slide groove; 41, C-shaped connecting part; 42, Z-shaped connecting part; 43, cylindrical part; 44, partition; 45, ventilation pipe; 14, annular precooling chamber; 32, retaining ring; 15, baffle. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0023] The EGR cooler is described in detail below in conjunction with the accompanying drawings and embodiments. Example

[0024] An EGR cooler comprises a cooler shell 10, an inlet pipe 11 and an outlet pipe 12. The EGR cooler also comprises an intake pipe 20, a bellows 21, a precooling pipe 22, an insulation pipe 23, a ceramic sleeve 30, a main board 40 and a heat dissipation core 13. The intake pipe 20, the bellows 21, the precooling pipe 22 and the cooler shell 10 are welded and fixed in sequence. The insulation pipe 23 is arranged on the inner side of the bellows 21, one end of which is welded and connected to the intake pipe 20, and the other end is supported and fixed to the bellows 21 through the ceramic sleeve 30. A main board 40 is arranged on the inner side of the precooling pipe 22, one side of the main board 40 is assembled and connected to the heat dissipation core 13, and the other side is slidably arranged in the slide groove 31 of the ceramic sleeve 30.

[0025] When working, the exhaust gas enters the cooler housing 10 from the intake pipe 20, and the cooling water enters the cooler housing 10 from the water inlet pipe 11. When the EGR cooler is axially dislocated due to thermal expansion and contraction or vibration, the heat dissipation core 13 is fixed away from one side of the intake pipe 20, and the other side moves relative axially. At this time, the heat dissipation core 13 can drive the main board 40 to slide relatively in the slide groove 31 of the ceramic sleeve 30, thereby avoiding the influence of axial dislocation caused by thermal expansion and contraction or vibration on the EGR cooler. At the same time, the ceramic sleeve 30 is located between the insulation tube 23 and the bellows 21, and plays a radial supporting role for the insulation tube 23. Due to the existence of the slide groove 31, the axial direction can still slide relatively. The use of the ceramic sleeve 30 improves the vibration resistance of the insulation tube 23.

[0026] In addition, the heat insulation tube 23 + ceramic sleeve ring 30 structure installed on the outside of the bellows 21 can insulate the bellows 21 and play a role in thermal protection.

[0027] Specifically, an air outlet pipe is fixedly connected to the other side of the cooler housing 10, and the heat dissipation core 13 and the cooler housing 10 are fixedly connected via a connecting plate.

[0028] A plurality of baffles 15 are further arranged in the cooler housing 10 , and the heat dissipation core 13 passes through the baffles 15 . Example

[0029] Embodiment 2 is an improvement on Embodiment 1, and the specific improvements include: the mainboard 40 may include an integrally formed C-shaped connecting portion 41, a Z-shaped connecting portion 42, and a cylindrical portion 43, the C-shaped connecting portion 41 is assembled and connected to the heat dissipation core 13, and the cylindrical portion 43 is slidably connected in the slide groove 31.

[0030] The precooling tube 22 , the Z-shaped connecting portion 42 and the cylindrical portion 43 form an annular precooling chamber 14 .

[0031] During operation, cooling water enters the cooler shell 10 from the water inlet pipe 11, and a part of the cooling water flows into the annular pre-cooling chamber 14 to form a cooling water channel, which can improve the cooling efficiency of the main board 40 and avoid the main board 40 from being thermally expanded by cold water. At the same time, the Z-shaped connecting part 42 structure of the main board 40 can improve the deformation resistance of the main board 40. In addition, there is a gap between the main board 40 and the pre-cooling pipe 22, and the periphery of the main board 40 is not constrained by the cooler shell 10, which can meet the radial thermal expansion needs of the main board 40.

[0032] Among them, the blank arrow represents the flow direction of exhaust gas, and the black arrow represents the flow direction of cooling water. Example

[0033] Embodiment 3 is an improvement on Embodiment 1, and the specific improvements include: the main board 40 further includes two partitions 44 arranged in parallel, the two partitions 44 are vertically fixedly arranged in the cylindrical portion 43, and ventilation pipes 45 are evenly installed on the two partitions 44.

[0034] Among them, by adding the partition 44, the deformation resistance of the cylindrical part 43 of the main board 40 is improved, and at the same time, the cooling water passes through the two partitions 44, and the thermal expansion capacity of the main board 40 is reduced through heat conduction. Example

[0035] Embodiment 5 is an improvement on Embodiment 1, and the specific improvements include: the diameters of the two sides of the ventilation pipe 45 are larger than the diameter of the middle part.

[0036] The vent pipe 45 is arranged such that the diameters of the two sides are larger than the diameter of the middle part, thereby forming a venturi tube, which can increase the exhaust gas velocity and improve the exhaust gas flow rate. Example

[0037] Example 6 is an improvement on Example 1, and the specific improvements include: the ceramic sleeve ring 30 is connected to the insulation tube 23 via a clamp ring 32.

[0038] The existence of the clamping ring 32 can better fix the ceramic ring 30 and prevent the ceramic ring 30 from slipping.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "includes..." do not exclude the existence of other identical elements in the article or device including the elements.

[0040] The above embodiments are only used to illustrate the technical solution of the utility model but not to limit it. The utility model is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, and all should be included in the scope of the claims of the utility model.

Claims

1. An EGR cooler, comprising a cooler housing (10), a water inlet pipe (11) and a water outlet pipe (12), characterized in that: The EGR cooler further comprises an intake pipe (20), a bellows (21), a precooling pipe (22), a heat insulation pipe (23), a ceramic sleeve ring (30), a main board (40), and a heat dissipation core (13); The air intake pipe (20), the bellows (21), the precooling pipe (22), and the cooler housing (10) are welded and fixed in sequence; the heat insulation pipe (23) is arranged inside the bellows (21), one end of which is welded and connected to the air intake pipe (20), and the other end of which is supported and fixed to the bellows (21) via a ceramic sleeve ring (30); The main board (40) is arranged inside the precooling tube (22); one side of the main board (40) is connected to the heat dissipation core (13), and the other side is slidably arranged in the slide groove (31) of the ceramic sleeve ring (30).

2. The EGR cooler according to claim 1, characterized in that: The main board (40) comprises an integrally formed C-shaped connecting portion (41), a Z-shaped connecting portion (42), and a cylindrical portion (43); the C-shaped connecting portion (41) is assembled and connected to the heat dissipation core (13); and the cylindrical portion (43) is slidably connected in the sliding groove (31).

3. The EGR cooler according to claim 2, characterized in that: The main board (40) further comprises two partitions (44) arranged in parallel, the two partitions (44) being vertically fixedly arranged in the cylindrical portion (43), and ventilation pipes (45) being evenly mounted on the two partitions (44).

4. The EGR cooler according to claim 3, characterized in that: The diameters of the ventilation pipe (45) at both sides are larger than the diameter at the middle.

5. The EGR cooler according to claim 2, characterized in that: The precooling tube (22), the Z-shaped connecting portion (42) and the cylindrical portion (43) form an annular precooling chamber (14).

6. The EGR cooler according to claim 1, characterized in that: The ceramic sleeve ring (30) is connected to the thermal insulation tube (23) via a clamping ring (32).

7. The EGR cooler according to claim 2, characterized in that: A plurality of baffles (15) are also provided in the cooler housing (10), and the heat dissipation core (13) passes through the baffles (15).

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