CN205744195U - EGR gas cooling structure - Google Patents
EGR gas cooling structure Download PDFInfo
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- CN205744195U CN205744195U CN201620601904.4U CN201620601904U CN205744195U CN 205744195 U CN205744195 U CN 205744195U CN 201620601904 U CN201620601904 U CN 201620601904U CN 205744195 U CN205744195 U CN 205744195U
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- 238000001816 cooling Methods 0.000 title claims abstract description 46
- 239000000498 cooling water Substances 0.000 claims abstract description 34
- 238000005192 partition Methods 0.000 claims 1
- 238000000638 solvent extraction Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 42
- 238000002485 combustion reaction Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Exhaust-Gas Circulating Devices (AREA)
Abstract
本实用新型提供一种EGR气体冷却结构。该EGR气体冷却结构包括，使EGR气体在其内部流通的EGR通道；及设置在EGR通道的外侧、用于使冷却水流通的冷却水通道，在EGR通道中形成有向内侧突起的散热片，并且，在EGR通道的未形成散热片的通道壁的外侧，形成有将冷却水通道分隔的壁部。基于本实用新型的结构，能够提高EGR气体的冷却效率。
The utility model provides an EGR gas cooling structure. The EGR gas cooling structure includes an EGR channel through which the EGR gas circulates; and a cooling water channel arranged on the outside of the EGR channel for circulating cooling water, and a cooling fin protruding inward is formed in the EGR channel, In addition, a wall portion partitioning the cooling water passage is formed outside the passage wall of the EGR passage on which no fins are formed. Based on the structure of the present invention, the cooling efficiency of the EGR gas can be improved.
Description
技术领域technical field
本实用新型涉及一种EGR气体冷却结构。The utility model relates to an EGR gas cooling structure.
背景技术Background technique
现有技术中，装备有EGR(Exhaust Gas Recirculation：废气再循环)装置的内燃机已为人们所知。EGR装置是为了降低氮氧化物(N Ox)的排放量及改善燃油消耗率而设置的，其用于使排放气体中的一部分(EGR气体)从排气侧回流到进气侧。另外，有的EGR装置中还设置有用于对EGR气体进行冷却的EGR气体冷却结构。Conventionally, an internal combustion engine equipped with an EGR (Exhaust Gas Recirculation: Exhaust Gas Recirculation) device is known. The EGR device is set up to reduce the emission of nitrogen oxides (NOx) and improve fuel consumption, and it is used to return a part of the exhaust gas (EGR gas) from the exhaust side to the intake side. In addition, some EGR devices are also provided with an EGR gas cooling structure for cooling the EGR gas.
EGR气体冷却结构例如包括EGR通道及冷却水通道。该EGR气体冷却结构中，通过使EGR气体与冷却水进行热交换，而将EGR气体冷却。EGR通道被构成为，能使EGR气体在其内部流通，其内侧形成有突起的散热片。冷却水通道被设置在EGR通道的外侧，用于使冷却水流通。The EGR gas cooling structure includes, for example, an EGR passage and a cooling water passage. In this EGR gas cooling structure, the EGR gas is cooled by exchanging heat between the EGR gas and cooling water. The EGR duct is configured to allow EGR gas to flow therein, and protruding fins are formed inside the duct. The cooling water passage is provided outside the EGR passage for circulating the cooling water.
因而，在上述现有技术中，EGR通道中形成有散热片的通道壁与EGR气体接触的面积增大，从而能促进EGR气体的冷却，但是，EGR通道的未形成散热片的通道壁则有可能得不到充分的冷却。Therefore, in the above-mentioned prior art, the area in which the passage wall of the EGR passage is formed with the cooling fins is in contact with the EGR gas increases, thereby promoting the cooling of the EGR gas. However, the passage walls of the EGR passage where the cooling fins are not formed have May not be cooled sufficiently.
实用新型内容Utility model content
针对上述技术问题，本实用新型的目的在于，提供一种能使EGR气体的冷却效率提高的EGR气体冷却结构。In view of the above technical problems, the purpose of this utility model is to provide an EGR gas cooling structure which can improve the cooling efficiency of EGR gas.
作为解决上述技术问题的技术方案，本实用新型提供一种EGR气体冷却结构。该EGR气体冷却结构包括，使EGR气体在其内部流通的EGR通道；及设置在所述EGR通道的外侧、用于使冷却水流通的冷却水通道，在所述EGR通道中形成有向内侧突起的散热片，其特征在于：在所述EGR通道的未形成所述散热片的通道壁的外侧，形成有将所述冷却水通道分隔的壁部。As a technical solution to solve the above technical problems, the utility model provides an EGR gas cooling structure. The EGR gas cooling structure includes an EGR passage through which EGR gas flows; and a cooling water passage provided outside the EGR passage for passing cooling water, and an inward protrusion is formed in the EGR passage. The cooling fin of the present invention is characterized in that: a wall portion separating the cooling water passage is formed outside the passage wall of the EGR passage where the cooling fin is not formed.
具有上述结构的本实用新型的EGR气体冷却结构的优点在于，由于在EGR通道的未形成散热片的通道壁的外侧设置有将冷却水通道分隔的壁部，所以能够扩大与冷却水的接触面积，降低EGR通道的未形成散热片的通道壁的温度。从而，能够促进EGR通道的未形成散热片的通道壁对EGR气体的热量吸收，提高EGR气体的冷却效率。The advantage of the EGR gas cooling structure of the present invention having the above-mentioned structure is that, since a wall portion separating the cooling water passage is provided outside the passage wall of the EGR passage without fins, the contact area with the cooling water can be enlarged. , to reduce the temperature of the channel wall of the EGR channel where no cooling fins are formed. Therefore, it is possible to promote the heat absorption of the EGR gas by the channel wall of the EGR channel on which no cooling fins are formed, and improve the cooling efficiency of the EGR gas.
另外，在上述本实用新型的EGR气体冷却结构中，较佳为，所述散热片被形成在所述EGR通道内的上壁面及下壁面上，所述壁部被形成在所述EGR通道的侧壁的外表面上。In addition, in the above-mentioned EGR gas cooling structure of the present invention, preferably, the cooling fins are formed on the upper wall surface and the lower wall surface of the EGR passage, and the wall portion is formed on the EGR passage. on the outer surface of the side wall.
附图说明Description of drawings
图1是表示本实用新型的一种实施方式的EGR气体冷却结构的概要结构示意图。FIG. 1 is a schematic configuration diagram showing an EGR gas cooling structure according to an embodiment of the present invention.
具体实施方式detailed description
以下，参照附图对本实用新型的实施方式进行说明。Hereinafter, embodiments of the present invention will be described with reference to the drawings.
首先，结合图1，对本实用新型的一种实施方式的EGR气体冷却结构100的概要结构进行说明。该EGR气体冷却结构100被设置在内燃机的EGR装置(省略图示)中。EGR气体冷却结构100被构成为，通过使EGR气体与冷却水热交换而对EGR气体进行冷却。First, a schematic structure of an EGR gas cooling structure 100 according to an embodiment of the present invention will be described with reference to FIG. 1 . This EGR gas cooling structure 100 is installed in an EGR device (not shown) of an internal combustion engine. The EGR gas cooling structure 100 is configured to cool the EGR gas by exchanging heat between the EGR gas and cooling water.
EGR气体冷却结构100如图1所示，具备EGR通道1、及冷却水通道2～4。该EGR气体冷却结构100例如被设置在内燃机的气缸盖50中。气缸盖50由铝合金等金属铸造而成。As shown in FIG. 1 , the EGR gas cooling structure 100 includes an EGR passage 1 and cooling water passages 2 to 4 . This EGR gas cooling structure 100 is provided, for example, in a cylinder head 50 of an internal combustion engine. The cylinder head 50 is cast from metal such as aluminum alloy.
EGR通道1被构成为能让EGR气体流通。该EGR通道1构成EGR装置的EGR气体回流通道的一部分。EGR通道1由气缸盖50中形成的截面为近似长方形的管状部51的内部空间构成。The EGR passage 1 is configured to allow the flow of EGR gas. The EGR passage 1 constitutes a part of the EGR gas return passage of the EGR device. The EGR passage 1 is constituted by an inner space of a tubular portion 51 having a substantially rectangular cross section formed in the cylinder head 50 .
另外，在EGR通道1内的上壁面及下壁面上形成有向内侧突起的散热片11。即，在EGR通道1内的上壁面上形成有向下方突起的散热片11；在EGR通道1内的下壁面上形成有向上方突起的散热片11。在上壁面及下壁面上分别设置有多个(本实施方式中为两个)该散热片11，这些散热片11沿着EGR通道1的延伸方向延伸。另外，也可以使散热片11在EGR通道1的延伸方向上分段，即，一个散热片11也可以由沿EGR通道1的延伸方向排成一列的多个小散热片组成。In addition, fins 11 protruding inward are formed on the upper wall surface and the lower wall surface of the EGR passage 1 . That is, the cooling fins 11 protruding downward are formed on the upper wall surface in the EGR passage 1 , and the cooling fins 11 protruding upward are formed on the lower wall surface in the EGR passage 1 . A plurality (two in the present embodiment) of the fins 11 are respectively provided on the upper wall surface and the lower wall surface, and these fins 11 extend along the extending direction of the EGR duct 1 . In addition, the cooling fins 11 can also be segmented in the extending direction of the EGR passage 1 , that is, one cooling fin 11 can also be composed of a plurality of small cooling fins arranged in a row along the extending direction of the EGR passage 1 .
冷却水通道2～4被设置在EGR通道1的外侧，供冷却水流通。该冷却水通道2～4用于对流过EGR通道1的EGR气体进行冷却。因而，冷却水通道2～4被设置为环绕在EGR通道1的周围、并沿着EGR通道1延伸。即，冷却水通道2～4由气缸盖50内的管状部51与外壁部52之间的空间构成。Cooling water passages 2 to 4 are arranged outside the EGR passage 1 for the circulation of cooling water. The cooling water passages 2 to 4 are used to cool the EGR gas flowing through the EGR passage 1 . Therefore, the cooling water passages 2 to 4 are provided to surround the EGR passage 1 and extend along the EGR passage 1 . That is, the cooling water passages 2 to 4 are constituted by spaces between the tubular portion 51 and the outer wall portion 52 in the cylinder head 50 .
另外，本实施方式中，在EGR通道1的两个侧壁的外侧，分别形成有向外延伸的壁部12及壁部13，并在下壁的外侧也形成有向下方延伸的壁部14。即，壁部12～14被构成为，从管状部51的外表面延伸而与外壁部52相连，将冷却水通道分隔成多个空间(2～4)。另外，管状部51、散热片11、壁部12～14、及外壁部52构成气缸盖50的一部分，由铝合金等金属构成为一体。In addition, in the present embodiment, outwardly extending wall portions 12 and 13 are respectively formed on the outer sides of both side walls of the EGR duct 1 , and a downwardly extending wall portion 14 is also formed on the outer sides of the lower wall. That is, the wall portions 12 to 14 are configured to extend from the outer surface of the tubular portion 51 to be connected to the outer wall portion 52, and divide the cooling water passage into a plurality of spaces (2 to 4). In addition, the tubular portion 51 , the fins 11 , the wall portions 12 to 14 , and the outer wall portion 52 constitute a part of the cylinder head 50 and are integrally formed of metal such as aluminum alloy.
冷却水通道2位于EGR通道1的上方，由管状部51、外壁部52、壁部12、及壁部13所围成的空间构成。冷却水通道3位于EGR通道1的下方，由管状部51、外壁部52、壁部12、及壁部14围成的空间构成。冷却水通道4位于EGR通道1的侧面，由管状部51、外壁部52、壁部13、及壁部14所围成的空间构成。The cooling water passage 2 is located above the EGR passage 1 and is composed of a space surrounded by the tubular portion 51 , the outer wall portion 52 , the wall portion 12 , and the wall portion 13 . The cooling water passage 3 is located below the EGR passage 1 and is composed of a space surrounded by the tubular portion 51 , the outer wall portion 52 , the wall portion 12 , and the wall portion 14 . The cooling water passage 4 is located on the side of the EGR passage 1 and is composed of a space surrounded by the tubular portion 51 , the outer wall portion 52 , the wall portion 13 , and the wall portion 14 .
本实施方式中，如上所述那样，通过在EGR通道1内的上壁面及下壁面上形成散热片11，能够扩大与EGR气体接触的面积，因而，能够促进EGR气体的冷却。进一步，通过在EGR通道1的侧壁的外表面上设置将冷却水通道2与冷却水通道3分隔(隔离)的壁部12，能够扩大与冷却水接触的面积，从而能够降低EGR通道1的侧壁的温度。同样，通过在EGR通道1的侧壁的外表面上设置将冷却水通道2与冷却水通道4分隔(隔离)的壁部13，能够扩大与冷却水接触的面积，从而能够降低EGR通道1的侧壁的温度。由此，能够促进EGR通道1的侧壁对EGR气体的热量吸收，从而提高EGR气体的冷却效率。In the present embodiment, as described above, by forming the fins 11 on the upper wall surface and the lower wall surface in the EGR duct 1 , the area in contact with the EGR gas can be enlarged, thereby promoting the cooling of the EGR gas. Further, by setting the wall portion 12 that separates (isolates) the cooling water passage 2 and the cooling water passage 3 on the outer surface of the side wall of the EGR passage 1, the area in contact with the cooling water can be enlarged, thereby reducing the pressure of the EGR passage 1. side wall temperature. Equally, by setting the wall portion 13 that separates (isolates) the cooling water passage 2 from the cooling water passage 4 on the outer surface of the side wall of the EGR passage 1, the area in contact with the cooling water can be enlarged, thereby reducing the pressure of the EGR passage 1. side wall temperature. Thereby, the heat absorption of the EGR gas by the side wall of the EGR passage 1 can be promoted, and the cooling efficiency of the EGR gas can be improved.
即，基于该EGR气体冷却结构100，通过在EGR通道1内的上壁面及下壁面上设置散热片11而促进了对EGR气体的热量吸收，同时，通过在EGR通道1的两个侧壁的外表面上设置壁部12及壁部13而促进了对冷却水的放热。即，EGR通道1(管状部51)的四个通道壁的冷却性能均得到提高。其结果，能够改善内燃机的燃油消耗率。That is, based on this EGR gas cooling structure 100, the heat absorption to the EGR gas is promoted by arranging fins 11 on the upper wall surface and the lower wall surface in the EGR passage 1; The wall portion 12 and the wall portion 13 are provided on the outer surface to promote heat dissipation to the cooling water. That is, the cooling performance of the four passage walls of the EGR passage 1 (tubular portion 51 ) is improved. As a result, the fuel consumption of the internal combustion engine can be improved.
＜其它实施方式＞＜Other Embodiments＞
上述实施方式中，说明了在内燃机的气缸盖50中设置EGR气体冷却结构100的例子，但不局限于此，也可以在内燃机的其它部位设置EGR气体冷却结构。In the above-mentioned embodiment, an example in which the EGR gas cooling structure 100 is provided in the cylinder head 50 of the internal combustion engine has been described, but the present invention is not limited to this, and the EGR gas cooling structure may be provided in other parts of the internal combustion engine.
另外，上述实施方式中，示出了在EGR通道1的两个侧壁的外表面上分别设置壁部12及壁部13的例子，但不局限于此，也可以只在EGR通道的一个侧壁的外表面上设置壁部。In addition, in the above-mentioned embodiment, the example in which the wall portion 12 and the wall portion 13 are respectively provided on the outer surfaces of the two side walls of the EGR passage 1 is shown, but it is not limited to this, and it is also possible to provide the wall portion 13 on only one side of the EGR passage. A wall portion is provided on an outer surface of the wall.
另外，上述实施方式中，示出了在EGR通道1的侧壁的外表面上设置一个壁部12(13)的例子，但不局限于此，也可以在EGR通道的侧壁的外表面上设置多个壁部。In addition, in the above-mentioned embodiment, the example in which one wall portion 12 (13) is provided on the outer surface of the side wall of the EGR passage 1 is shown, but it is not limited to this, and the wall portion 12 (13) may also be provided on the outer surface of the side wall of the EGR passage. A plurality of wall sections are provided.
另外，上述实施方式中，示出了在EGR通道1内的上壁面及下壁面形成向内侧突起的散热片11的同时，在EGR通道1的两个侧壁的外表面上分别形成向外延伸的壁部12及壁部13的例子，但不局限于此，也可以在EGR通道的上壁及下壁的至少一方的外表面上设置将冷却水通道分隔的壁部的同时，在EGR通道内的两个侧壁面的至少一方形成向内侧突起的散热片。In addition, in the above-mentioned embodiment, it is shown that the heat dissipation fins 11 protruding inward are formed on the upper wall surface and the lower wall surface of the EGR passage 1, and at the same time, outwardly extending fins are formed on the outer surfaces of the two side walls of the EGR passage 1. Examples of the wall portion 12 and the wall portion 13, but not limited thereto, may also be provided on the outer surface of at least one of the upper wall and the lower wall of the EGR passage to separate the wall portion that separates the cooling water passage, and the EGR passage At least one of the two inner side wall surfaces forms a cooling fin protruding inward.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111971467A (en) * | 2020-02-17 | 2020-11-20 | 株式会社小松制作所 | Cylinder head and engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111971467A (en) * | 2020-02-17 | 2020-11-20 | 株式会社小松制作所 | Cylinder head and engine |
| US11242819B2 (en) | 2020-02-17 | 2022-02-08 | Komatsu Ltd. | Cylinder head and engine |
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