An easy-to-assemble EGR cooler

Abstract

The present invention discloses an easily assembled EGR cooler, comprising a water shell, a water pipe and a plurality of cooling pipes, wherein a main board and an air chamber are arranged at both ends of the water shell; the main board comprises a bottom plate, the bottom plate has flanges around it, a plurality of perforations are provided on the bottom plate, the two ends of the cooling pipe are respectively inserted into the perforations of the main board, and the two ends of the inner cavity thereof are connected with the inner cavity of the air chamber to form an air path system; the outer wall of the cooling pipe and the space between the water shell and the main boards at both ends constitute a water path system, and the air path system and the water path system are independent and closed from each other; the end face of the main board flange is welded to the end face of the water shell, and the inner wall of one end of the air chamber is respectively welded to the outer wall of the main board flange and the outer wall of the water shell. The present invention can reduce the assembly relationship of the main board, improve the assemblability of the product, reduce the difficulty of product assembly, and further reduce the production cost of the product; the main board only needs to ensure the outer size of the flange, which can reduce the difficulty of parts processing and further reduce the production cost of parts.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, in particular to the field of EGR coolers, in particular to an EGR cooler which is easy to assemble. Background Art

[0002] Exhaust gas recirculation technology is one of the main technical routes for engines to achieve emissions above National III. Before the exhaust gas is recirculated into the engine cylinder, it needs to be cooled to a certain temperature through an exhaust gas recirculation cooler (EGR cooler for short). With the tightening of national emission regulations, engine emissions have put forward higher requirements on the heat exchange power of the EGR cooler, which requires the EGR cooler to use more cooling pipes to improve the heat exchange power.

[0003] At present, the most common structures of EGR coolers are: Figure 1 and Figure 2 As shown, it includes a water shell 4, a water pipe 3 is arranged on the water shell 4, a plurality of cooling pipes 5 are arranged in the inner cavity of the water shell, and a main board 2 and an air chamber 1 are arranged at both ends of the water shell 4; the main board 2 includes a bottom plate 201, and the bottom plate 201 has flanges 203 around it, and a plurality of through holes 202 are opened on the bottom plate 201, and the two ends of the cooling pipe 5 are respectively inserted into the through holes 202 of the main boards 2 at both ends and welded to the main boards 2; the two ends of the cooling pipe 5 are connected to the inner cavity 101 of the air chamber 1 to form an air path system; the outer side of the cooling pipe 5 and the space between the water shell 4 and the main boards 2 at both ends constitute a water path system; the inner wall of the main board flange 203 is welded to the outer wall of the water shell 4, and the outer wall of the main board flange 203 is welded to the step surface 102 at one end of the air chamber 1.

[0004] When assembling the EGR cooler of this structure, the main board 2 and the cooling pipe 5 are first assembled, and then the main board 2 is inserted into the water shell 4, and finally the air chamber 1 is assembled on the outside of the main board 2. The assembly relationship is relatively complicated, and as the number of cooling pipes increases, the assembly difficulty becomes greater.

[0005] Therefore, improving the parts assembly relationship is one of the effective measures to improve the assemblability of the EGR cooler. Summary of the invention

[0006] The present invention aims to solve the above-mentioned technical problems existing in the prior art, and aims to provide an EGR cooler that is easy to assemble.

[0007] To solve the above problems, the present invention adopts the following technical solutions: an easily assembled EGR cooler, comprising a water shell, a water pipe communicating with the inner cavity of the water shell is arranged on the water shell, a plurality of cooling pipes are arranged in the inner cavity of the water shell, and a main board and an air chamber are arranged at both ends of the water shell; the main board comprises a bottom plate, the bottom plate has flanges around it, a plurality of through holes are opened on the bottom plate, and the two ends of the cooling pipe are respectively inserted into the through holes of the main boards at both ends and welded; the two ends of the inner cavity of the cooling pipe are connected with the inner cavity of the air chamber to form an air path system; the outer wall of the cooling pipe and the space between the water shell and the main boards at both ends constitute a water path system, and the air path system and the water path system are independent of each other and closed; it is characterized in that the end face of the flange of the main board is welded to the end face of the water shell, and the inner wall of one end of the air chamber is respectively welded to the outer wall of the flange of the main board and the outer wall of the water shell.

[0008] The EGR cooler of the present invention is easy to assemble and has the following beneficial technical effects:

[0009] 1. Since the mainboard and the water shell are connected by end-to-end welding, the assembly relationship of the mainboard can be reduced, the assemblability of the product is improved, the difficulty of product assembly is reduced, and the production cost of the product is reduced;

[0010] 2. The mainboard of the present invention only needs to ensure the outer size of the flange, which can reduce the difficulty of parts processing and further reduce the production cost of parts.

[0011] As a further improvement of the present invention, the main body of the air chamber 1 is a conical structure, and the large-diameter end has a circular tube structure, the inner surface of which forms a step surface connected to the outer wall of the main board flange and the outer wall of the water shell.

[0012] As a further improvement of the present invention, the connection portion between the step surface and the air chamber body has a bulging zone, so that the wall thickness at this location is increased to improve the strength of the air chamber.

[0013] As a further improvement of the present invention, the bulging zone and the circular tube structure are transitioned through an arc surface.

[0014] As a further improvement of the present invention, the flange of the main board and the bottom board are transitioned through an arc surface.

[0015] As a further improvement of the present invention, the arc surface of the main board is tangent to the arc surface of the air chamber.

[0016] As a further improvement of the present invention, the through holes on the mainboard are provided in groups.

[0017] As a further improvement of the present invention, two groups of through holes are provided on the main board.

[0018] As a further improvement of the present invention, the through-holes on the main board are square holes, round holes, elliptical holes or waist-round holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the background technology.

[0020] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0021] Figure 3 It is a structural schematic diagram of the EGR cooler of the present invention.

[0022] Figure 4 yes Figure 3 A magnified schematic diagram of point B in the middle.

[0023] Figure 5 It is a structural schematic diagram of the mainboard of the present invention.

[0024] Figure 6 yes Figure 5 Schematic diagram of the CC section.

[0025] Figure 7 yes Figure 6 Enlarged schematic diagram of point D in the middle.

[0026] Figure 8 It is a three-dimensional diagram of the main board of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] Figure 1 and Figure 2 This is a schematic diagram of the structure of an existing EGR cooler, the defects of which have been described above and will not be repeated here.

[0029] Reference Figure 3-Figure 8 The present invention discloses an easily assembled EGR cooler, comprising a water shell 4, a water pipe 3 communicating with an inner cavity 401 of the water shell is provided on the water shell 4, a plurality of cooling pipes 5 are provided in the inner cavity 401 of the water shell, a main board 2 and an air chamber 1 are provided at both ends of the water shell 4; the main board 2 comprises a bottom plate 201, a flange 203 is provided around the bottom plate 201, a plurality of through holes 202 are provided on the bottom plate 201, and both ends of the cooling pipe 5 are respectively inserted into the through holes 202 of the main boards 2 at both ends and welded to the hole walls; both ends of the inner cavity 501 of the cooling pipe 5 are connected with the inner cavity 101 of the air chamber 1 to form an air path system; the outer wall of the cooling pipe 5 and the space between the water shell 4 and the main boards 2 at both ends constitute a water path system, and the air path system and the water path system are independent and closed; the end face 204 of the main board flange is welded to the end face of the water shell 4, and the inner wall of one end of the air chamber 1 is respectively welded to the outer wall of the main board flange 203 and the outer wall of the water shell 4.

[0030] The main body of the air chamber 1 is a conical structure, and one end with a large diameter has a circular tube structure 103 , and the circular tube structure 103 forms a step surface 102 connected to the outer wall of the main plate flange 203 and the outer wall of the water shell 4 .

[0031] The connection part between the step surface 102 and the air chamber body has a bulging zone 104, which increases the wall thickness at this location to improve the strength of the air chamber. The bulging zone 104 and the circular tube structure 103 are transitioned through an arc surface 105.

[0032] The flange 203 of the main board is transitioned to the bottom board 201 by an arc surface 205. The arc surface 205 of the main board is tangent to the arc surface 105 of the air chamber.

[0033] The perforations 202 on the main board 2 are provided in groups. The perforations 202 may be one or more groups, and the number of perforations in each group is 6-12. The perforations 202 may be square holes, round holes, elliptical holes, or oval holes. In this embodiment, two groups of perforations 202 are provided on the main board 2, and the number of perforations 202 in each group is 8, and the shape of the perforations 202 is oval.

[0034] It should be understood that the above embodiments are merely illustrative of the present invention rather than limiting the present invention, and any inventions that do not exceed the essential spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. An easily assembled EGR cooler, comprising a water shell (4), a water pipe (3) connected to an inner cavity (401) of the water shell being provided on the water shell (4), a plurality of cooling pipes (5) being provided in the inner cavity (401) of the water shell, a main board (2) and an air chamber (1) being provided at two ends of the water shell (4); the main board (2) comprising a bottom plate (201), the bottom plate (201) having flanges (203) around its periphery, a plurality of through holes (202) being provided on the bottom plate (201), two ends of the cooling pipe (5) being respectively inserted into the through holes (202) of the main boards (2) at both ends and welded; two ends of the inner cavity (501) of the cooling pipe (5) being connected to the inner cavity (101) of the air chamber (1) to form an air path system; an outer wall of the cooling pipe (5) and a space between the water shell (4) and the main boards (2) at both ends are connected to the inner cavity (101) of the air chamber (1) to form an air path system; The water circuit system is formed, and the air circuit system and the water circuit system are independent of each other and closed; the end face (204) of the main plate flange is welded to the end face of the water shell (4), and the inner wall of one end of the air chamber (1) is respectively welded to the outer wall of the main plate flange (203) and the outer wall of the water shell (4); the main body of the air chamber (1) is a conical structure, and the end with a large diameter has a circular tube structure (103), and the circular tube structure (103) forms a step surface (102) connected to the outer wall of the main plate flange (203) and the outer wall of the water shell (4); the connection part of the step surface (102) and the main body of the air chamber has a bulging band (104), so that the wall thickness at this place is increased to improve the strength of the air chamber, and the bulging band (104) and the circular tube structure (103) are transitioned through a circular arc surface (105).

2. An easily assembled EGR cooler as claimed in claim 1, characterized in that A circular arc surface (205) is used to transition between the flange (203) of the main board and the bottom plate (201).

3. An easily assembled EGR cooler as claimed in claim 2, wherein the arc surface (205) of the main board is tangent to the inner wall of the air chamber.

4. An easily assembled EGR cooler as claimed in claim 1, characterized in that The perforations (202) on the main board (2) are arranged in groups.

5. An easily assembled EGR cooler as claimed in claim 4, characterized in that The main board (2) is provided with two groups of through holes (202).

6. An easily assembled EGR cooler as claimed in claim 5, characterized in that The number of perforations (202) in each group is 6-12.

7. An easily assembled EGR cooler according to any one of claims 1 to 6, characterized in that The perforations (202) are square holes, round holes, elliptical holes or waist-shaped holes.

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