阅读说明：本技术 一种egr连接管组件 (EGR (exhaust gas recirculation) connecting pipe assembly ) 是由 卢响 张猛 周晋成 石彦明 李乾语 张杰坤 蒋巍伟 申浩 于 2020-07-08 设计创作，主要内容包括：本发明公开了一种EGR连接管组件,包括：长连接管和短连接管,长连接管的取气端用以与第一排气歧管连接,长连接管的排气端用以与冷却器的进气端连接；短连接管的取气端用以与第二排气歧管连接,短连接管的排气端用以与冷却器的进气端连接。高温废气经长连接管和短连接管进入冷却器之后,冷却器借助发动机冷却器系统对废气进行降温,废气和新鲜空气的混合气一同参与燃烧。其中通过长连接管和短连接管分别取气,可避免气流的相互干扰,进而保证冷却器进气压力。此外相对于单根管径较大的连接管,通过两根管径较小的连接管,可减小折弯半径,进而使得EGR连接管组件结构紧凑,从而保证安装空间。(The invention discloses an EGR connecting tube assembly, comprising: the gas taking end of the long connecting pipe is used for being connected with the first exhaust manifold, and the exhaust end of the long connecting pipe is used for being connected with the gas inlet end of the cooler; the gas taking end of the short connecting pipe is used for being connected with the second exhaust manifold, and the gas exhaust end of the short connecting pipe is used for being connected with the gas inlet end of the cooler. After the high-temperature waste gas enters the cooler through the long connecting pipe and the short connecting pipe, the cooler cools the waste gas by means of an engine cooler system, and the mixed gas of the waste gas and fresh air participates in combustion together. Wherein get gas respectively through long connecting pipe and short connecting pipe, can avoid the mutual interference of air current, and then guarantee cooler inlet pressure. In addition, for a single connecting pipe with a large pipe diameter, the bending radius can be reduced through two connecting pipes with small pipe diameters, so that the EGR connecting pipe assembly is compact in structure, and the installation space is ensured.)

1. An EGR junction tube assembly, comprising: the gas taking end of the long connecting pipe is used for being connected with the first exhaust manifold, and the exhaust end of the long connecting pipe is used for being connected with the gas inlet end of the cooler; the gas taking end of the short connecting pipe is used for being connected with a second exhaust manifold, and the gas exhaust end of the short connecting pipe is used for being connected with the gas inlet end of the cooler.

2. The EGR coupler tube assembly of claim 1, wherein the gas intake end of the long coupler tube is provided with a coupler post, the coupler post is provided with a through hole, and the gas intake end of the long coupler tube is connected to the first exhaust manifold by a first fastener passing through the coupler post.

3. The EGR coupler tube assembly of claim 2, wherein the gas-taking end of the long coupler tube is provided with a plurality of coupler posts and the first fasteners in one-to-one correspondence with the coupler posts.

4. The EGR coupler tube assembly of claim 1, wherein the exhaust end of the long coupler tube and the exhaust end of the short coupler tube are removably coupled to the cooler by flanges, and the gas intake end of the short coupler tube is removably coupled to the second exhaust manifold by flanges.

5. The EGR coupler tube assembly of claim 1, wherein the gas-taking end of the long coupler tube is detachably connected to its body by a flange.

6. The EGR coupler tube assembly of claim 1, wherein the elongated coupler tube has a first bellows section disposed thereon.

7. The EGR coupler tube assembly of claim 6, wherein a second bellows segment is provided on the stub tube.

Technical Field

The invention relates to the technical field of engines, in particular to an EGR connecting pipe assembly.

Background

With the increasingly strict requirements on emission and use economy of the engine, part of low-temperature exhaust gas needs to be introduced at the same time of introducing fresh air during engine combustion, so that the fresh air intake is reduced to reduce the emission of nitrogen oxides, and meanwhile, the power and the torque of the engine need to be ensured.

Egr (exhaust Gas recirculation) refers to exhaust Gas recirculation, which refers to the recirculation of a portion of the exhaust Gas from the engine back into the intake manifold and re-entering the cylinders with fresh mixture. Because the waste gas contains a large amount of CO₂Equal polyatomic gas, and CO₂When the gas cannot be combusted, the gas absorbs a large amount of heat due to high specific heat capacity, so that the maximum combustion temperature of the air-fuel mixture in the cylinder is lowered, and the generation amount of NOx is reduced.

At present, a single EGR connecting pipe is mainly adopted for taking gas from an exhaust manifold, the pipe diameter is large, and in order to meet the air inlet pressure of an EGR cooler, the air inlet flow of waste gas needs to be increased, so that the EGR rate is high. A high EGR rate means that the amount of fresh air is reduced, the in-cylinder combustion is deteriorated, the in-cylinder pressure and the maximum explosion pressure are both significantly reduced, the time until the peak pressure is reached is delayed, the peak value of the heat release rate is reduced, and the in-cylinder combustion condition is deteriorated after the heat release rate curve is entirely extrapolated. The carbon smoke emission is increased to cause serious carbon deposition of the engine, so that the fuel and gas economy of the engine is reduced, and the service life of the engine is shortened.

Disclosure of Invention

Accordingly, it is an object of the present invention to provide an EGR connection tube assembly that reduces the pressure and kinetic energy loss of the air flow before it enters the EGR cooler.

In order to achieve the purpose, the invention provides the following technical scheme:

an EGR connection tube assembly, comprising: the gas taking end of the long connecting pipe is used for being connected with the first exhaust manifold, and the exhaust end of the long connecting pipe is used for being connected with the gas inlet end of the cooler; the gas taking end of the short connecting pipe is used for being connected with a second exhaust manifold, and the gas exhaust end of the short connecting pipe is used for being connected with the gas inlet end of the cooler.

Preferably, the gas taking end of the long connecting pipe is provided with a connecting column, a through hole is formed in the connecting column, and the gas taking end of the long connecting pipe penetrates through the connecting column and is connected with the first exhaust manifold through a first fastener.

Preferably, the gas taking end of the long connecting pipe is provided with a plurality of connecting columns and first fasteners in one-to-one correspondence with the connecting columns.

Preferably, the exhaust end of the long connecting pipe and the exhaust end of the short connecting pipe are detachably connected with the cooler through flanges, and the gas taking end of the short connecting pipe is detachably connected with the second exhaust manifold through a flange.

Preferably, the gas taking end of the long connecting pipe is detachably connected with the body of the long connecting pipe through a flange.

Preferably, the long connecting pipe is provided with a first corrugated pipe section.

Preferably, a second corrugated pipe section is arranged on the short connecting pipe.

Compared with the prior art, the technical scheme has the following advantages:

the invention provides an EGR connecting pipe assembly, which comprises: the gas taking end of the long connecting pipe is used for being connected with the first exhaust manifold, and the exhaust end of the long connecting pipe is used for being connected with the gas inlet end of the cooler; the gas taking end of the short connecting pipe is used for being connected with the second exhaust manifold, and the gas exhaust end of the short connecting pipe is used for being connected with the gas inlet end of the cooler. After the high-temperature waste gas enters the cooler through the long connecting pipe and the short connecting pipe, the cooler cools the waste gas by means of an engine cooler systemThe mixer of waste gas and fresh air participates in combustion together, CO₂The inert gas having a large specific heat value retards ignition and slows down combustion efficiency, so that as the EGR rate increases, the in-cylinder pressure and the maximum explosive force both significantly decrease, the time until the peak pressure is reached is delayed, the peak value of the heat release rate decreases, and the heat release rate curve is entirely withdrawn, thereby deteriorating the in-cylinder combustion condition and lowering the exhaust gas temperature. In addition, the gas is respectively taken through the long connecting pipe and the short connecting pipe, so that the mutual interference of the gas flow can be avoided, and the gas inlet pressure of the cooler is further ensured. Secondly for the great connecting pipe of single pipe diameter, through the less connecting pipe of two pipe diameters, can reduce bend radius, and then make EGR connecting pipe subassembly compact structure to guarantee installation space.

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 is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic illustration of an EGR connector tube assembly in accordance with an embodiment of the present invention;

FIG. 2 is a schematic illustration of a front view of an EGR connector tube assembly in connection with an exhaust manifold, in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a top view of an EGR connector tube assembly coupled to an exhaust manifold in accordance with an embodiment of the present invention;

fig. 4 is a left side view of an EGR coupler tube assembly in connection with an exhaust manifold according to an embodiment of the present invention.

The reference numbers are as follows:

the heat insulation device comprises a long connecting pipe 1, a connecting column 1-1, a fastener 1-2, a flange 1-3, a bolt 1-4, a gasket 1-5, a gas taking end 1-6 of the long connecting pipe, a short connecting pipe 2, a cooler 3, an exhaust manifold front section 4, an exhaust manifold middle section 5, an exhaust manifold rear section 6, a rear heat insulation cover 7 and a front heat insulation cover 8.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 to 4, fig. 1 is a schematic structural diagram of an EGR connection tube assembly according to an embodiment of the present invention; FIG. 2 is a schematic illustration of a front view of an EGR connector tube assembly in connection with an exhaust manifold, in accordance with an embodiment of the present invention; FIG. 3 is a schematic diagram illustrating a top view of an EGR connector tube assembly coupled to an exhaust manifold in accordance with an embodiment of the present invention; fig. 4 is a left side view of an EGR coupler tube assembly in connection with an exhaust manifold according to an embodiment of the present invention.

The embodiment of the invention provides an EGR connecting pipe assembly, which comprises: the air conditioner comprises a long connecting pipe 1 and a short connecting pipe 2, wherein the air taking end 1-6 of the long connecting pipe 1 is used for being connected with a first exhaust manifold, and the exhaust end of the long connecting pipe 1 is used for being connected with the air inlet end of a cooler 3; the gas intake end of the short connecting pipe 2 is used for connecting with the second exhaust manifold, and the gas exhaust end of the short connecting pipe 2 is used for connecting with the gas intake end of the cooler 3. After high-temperature waste gas enters a cooler 3 through a long connecting pipe 1 and a short connecting pipe 2, the cooler 3 cools the waste gas by means of an engine cooler system, the waste gas enters an air inlet side under the control of an electric system through an EGR valve, and during combustion, mixed gas of the waste gas and fresh air participates in combustion together, and CO is generated₂The inert gas having a large specific heat value retards ignition and slows combustion efficiency, so that as the EGR rate increases, the in-cylinder pressure and the maximum explosive force both significantly decrease, the time until the peak pressure is reached is delayed, the peak value of the heat release rate decreases, and the heat release rate curve is entirely retreated, thereby worsening the in-cylinder combustion conditionThe exhaust temperature is lowered. In addition, the long connecting pipe 1 and the short connecting pipe 2 are respectively used for taking gas, so that the mutual interference of gas flows can be avoided, and the gas inlet pressure of the cooler 3 is further ensured. Secondly for the great connecting pipe of single pipe diameter, through the less connecting pipe of two pipe diameters, can reduce bend radius, and then make EGR connecting pipe subassembly compact structure to guarantee installation space.

Taking a six-cylinder engine as an example for explanation, the cylinder cover body is connected with an inlet of an exhaust manifold, exhaust gas in the inlet is introduced into an exhaust manifold front section 4, an exhaust manifold middle section 5 and an exhaust manifold rear section 6, the exhaust manifold front section 4 and the exhaust manifold middle section 5 are connected with the exhaust manifold rear section 6 in a cylindrical clearance fit manner, so that two internal circulation air passages which are not interfered with each other are formed, the exhaust manifold front section 4 and the exhaust manifold middle section 5 form one internal circulation air passage, the exhaust manifold middle section 5 and the exhaust manifold rear section 6 form the other internal circulation air passage, the gas taking end of the long connecting pipe 1 is connected with the exhaust manifold middle section 5, and the gas taking end of the short connecting pipe 2 is connected with the exhaust manifold rear section 5. In addition, a rear heat shield 7 and a front heat shield 8 are arranged on the cylinder cover body to play a role in isolating heat of the exhaust manifold.

Further, a connecting column 1-1 is arranged at a gas taking end 1-6 of the long connecting pipe 1, a through hole is formed in the connecting column 1-1, the connecting column 1-1 and the through hole are coaxial, the gas taking end 1-6 of the long connecting pipe 1 penetrates through the connecting column 1-1 through a first fastener 1-2 to be connected with the middle section 5 of the exhaust manifold, and a bolt is preferably selected as the first fastener 1-2. Because the exhaust temperature is higher, the bolt is easy to sinter, and the connecting column 1-1 can play a role in heat dissipation so as to prevent the bolt from sintering and further cause the problem of difficult disassembly during maintenance.

The gas taking end 1-6 of the long connecting pipe 1 is provided with a plurality of connecting columns 1-1 and first fastening pieces 1-2 which correspond to the connecting columns 1-1 one by one, so that the mounting stability of the gas taking end is improved.

Further, the exhaust end of the long connecting pipe 1 and the exhaust end of the short connecting pipe 2 are detachably connected with the cooler 3 through flanges 1-3, the gas taking end of the short connecting pipe 2 is detachably connected with the exhaust manifold rear section 6 through flanges 1-3, the exhaust end of the long connecting pipe 1 is preferably welded with the flanges 1-3, the exhaust end of the short connecting pipe 2 is welded with the corresponding flanges 1-3, the gas taking end of the short connecting pipe 2 is also welded with the corresponding flanges 1-3, the flanges 1-3 are detachably connected through bolts 1-4 respectively, and gaskets 1-5 are arranged on the mounting surfaces of the flanges 1-3 to ensure the tightness of connection. After the long connecting pipe 1 and the short connecting pipe 2 are damaged, only the long connecting pipe 1 or the short connecting pipe 2 needs to be replaced independently, so that the later-stage use cost can be reduced.

In addition, the gas taking end 1-6 of the long connecting pipe 1 is detachably connected with the body through the flange 1-3, namely the body of the long connecting pipe 1 and the gas taking end 1-6 are of a split structure, and therefore maintenance of the long connecting pipe 1 can be facilitated. The flange is preferably in a diamond shape, round corners are arranged at the edges of the diamond shape, and mounting holes for bolt connection can be respectively arranged at two sharp corners of the flange. In addition, in order to obtain a smaller bending angle, the gas extraction end 1-6 of the long connecting pipe 1 is preferably made of cast.

Furthermore, a first corrugated pipe section is arranged on the long connecting pipe 1, and a second corrugated pipe section is arranged on the short connecting pipe 2. Due to the flexibility of the corrugated pipe, the long connecting pipe 1 and the short connecting pipe 2 can be conveniently arranged in a pipe arrangement mode, and the installation space is reasonably utilized. The section of the long connecting tube between its exhaust end and the first bellows section is preferably a steel tube.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

An EGR coupling tube assembly provided by the present invention has been described in detail. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.