CN216111050U

CN216111050U - Improved exhaust gas recirculation device

Info

Publication number: CN216111050U
Application number: CN202122720569.3U
Authority: CN
Inventors: 赵宗立; 张人铨; 曹文跃; 刁月红; 王云飞; 彭森
Original assignee: Boma Technology Shanghai Co ltd
Current assignee: Boma Technology Shanghai Co ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2022-03-22
Anticipated expiration: 2031-11-09

Abstract

The utility model discloses an improved exhaust gas recirculation device, one end of a middle shell is provided with an air flow meter end back plate, the other end of the middle shell is provided with a turbine back plate, the middle shell is provided with an axial oil duct along the axial direction, a cooling water channel and an air channel are arranged inside the middle shell, the cooling water channel and the air channel are all arranged outside the axial oil duct in a circular arc shape, the cooling water channel and the air channel are all arranged in the middle shell in an arc shape, the air channel is sleeved on the outer wall of the cooling water channel, two ends of the cooling water channel are respectively provided with a water channel connector, the middle position of the cooling water channel is provided with a water channel plug, one end of the air channel is connected with the turbine back plate, the other end of the air channel is connected with the air flow meter end back plate, and the air channel is also provided with an EGR valve. Therefore, the problem of exhaust pollution of low-pressure EGR does not exist, and the anti-pollution coating of the pinch roller can be eliminated.

Description

Improved exhaust gas recirculation device

Technical Field

The utility model relates to the field of machinery, in particular to an exhaust technology of an internal combustion engine, and specifically relates to an improved exhaust gas recirculation device.

Background

Exhaust Gas Recirculation (EGR) is a technique in which a part of Exhaust Gas is separated after combustion in an internal combustion engine and introduced into an intake side to be combusted again. The task of an EGR system is to optimize the amount of exhaust gas recirculation at each operating point, so that the combustion process is always optimal, and finally to ensure that the pollutant content of the emissions is minimal.

The gasoline engine can achieve the purposes of energy conservation and emission reduction by applying an EGR technology, the effective fuel consumption rate can be reduced by 3-8% according to different engine and EGR control strategies, and the emission of nitrogen oxide/CO 2 and the like can be effectively reduced. Turbocharged engine EGR systems also have a high pressure and low pressure separation. Existing high pressure EGR, low pressure EGR applications, where high pressure EGR is located before the turbocharger and gas is taken before the turbine, gas pressure is higher, as shown in fig. 7, and low pressure EGR is located after the turbocharger and gas pressure is lower, as shown in fig. 8.

High-pressure EGR: the disadvantage is that EGR is only used at a range of rpm and load, and does not cover the anti-knock region (high pressure EGR exhaust gas temperature is high, and the temperature is still high after cooling, increasing the probability of engine knock due to over-temperature), and its cost is also higher than low pressure EGR. The turbine efficiency is reduced to some extent due to the extraction of gas at the front end of the turbine. In addition, the EGR valve and the cooler are polluted by the waste gas, and the overall fuel saving effect is lower than that of low-pressure loop EGR. Low pressure EGR has the disadvantage of low pressure differential, and therefore requires the use of a mixing valve to meet flow requirements throughout all operating conditions. Before waste gas is introduced into the gas compressor, the pollution problem of the gas compressor and the intercooler needs to be considered, and a filter screen needs to be installed on a gas inlet flange of the cooler. The response speed is slow compared to that of a high-pressure EGR line. Meanwhile, the low-pressure EGR also needs to consider the problems of reliability and durability (pipeline arrangement and vibration absorption design) and condensate water, and an anti-corrosion coating is added on the air compressor and the intercooler, so that the system of the low-pressure EGR is more complex and higher in cost compared with the high-pressure EGR. Accordingly, there is a need for an improved technique to solve the above-mentioned problems in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an improved exhaust gas recirculation device which is approximately close to high-pressure EGR, but is cooled by means of the existing cold-default pipeline of a turbocharger, so that the original EGR pipeline system and an EGR cooler can be eliminated, and the gas taking point is positioned behind a turbine back plate, so that the pressure and the temperature are relatively low, and the cooling and the control are easy; after the air outlet point is the end back plate of the air flow meter, the exhaust gas pollution problem of low-pressure EGR does not exist because of high exhaust gas flow speed and the acceleration of the air compressor, and a nickel-phosphorus coating (pollution-resistant coating) of the pinch roller can be considered to be eliminated so as to solve the problems in the background art.

In order to achieve the purpose, the utility model provides the following technical scheme: an improved exhaust gas recirculation device comprises a turbocharger, an air flow meter, an intercooler, an internal combustion engine and an exhaust pipe, wherein the turbocharger comprises a middle shell, one end of the middle shell is provided with an air flow meter end back plate, the other end of the middle shell is provided with a turbine back plate, the middle shell is axially provided with an axial oil duct, one side of the axial oil duct is provided with a first oil path bypass, the other side of the axial oil duct is provided with a second oil path bypass, a cooling water channel and an air passage are arranged in the middle shell, the cooling water channel and the air passage are all surrounded outside the axial oil duct, the cooling water channel and the air passage are all arranged in the middle shell in a circular arc shape, the air passage is sleeved on the outer wall of the cooling water channel, two ends of the cooling water channel are respectively provided with a water channel connector, and a water channel plug is arranged in the middle of the cooling water channel, one end of the air passage is connected to the turbine back plate, the other end of the air passage is connected to the air flow meter end back plate, and the air passage is further provided with an EGR valve; the outer end of the end back plate of the air flow meter is respectively connected with an air flow meter and an intercooler, one end of the intercooler, which is far away from the end back plate of the air flow meter, is connected with the inlet end of the internal combustion engine through a throttle valve, the outlet end of the internal combustion engine is connected with one end of a turbine back plate, and one end of the turbine back plate is also connected with an exhaust pipe.

Preferably, the air passage is connected to one end of the turbine back plate and is an air inlet, and the air passage penetrates through the turbine back plate to realize connection with the external air passage.

Preferably, the air passage is connected to one end of the air flow meter end back plate to form an air outlet and penetrates through the air flow meter end back plate so as to realize connection with an external air passage.

Preferably, the first oil path bypass, the second oil path bypass, the water path connector and the water path plug respectively penetrate through the outer wall of the middle shell to be connected with an external oil path.

Preferably, the first oil path is located by-pass inside the middle housing, and one end of the first oil path penetrates through the end back plate of the air flow meter.

Preferably, the second oil path is bypassed in the middle shell, and one end of the second oil path is communicated with the axial oil path.

Compared with the prior art, the utility model has the beneficial effects that:

(1) the existing cooling pipeline of the turbocharger is used for cooling, the original EGR pipeline system and an EGR cooler can be eliminated, the gas taking point is located behind the turbine back plate, the pressure and the temperature are relatively low, and cooling and control are easy.

(2) After the air outlet point is the end back plate of the air flow meter, the exhaust gas pollution problem of low-pressure EGR does not exist because of high exhaust gas flow speed and the acceleration of the air compressor, and a nickel-phosphorus coating (pollution-resistant coating) of the pinch roller can be considered to be eliminated.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the internal structure of FIG. 1 at the point marked A;

FIG. 3 is a schematic diagram of a front view of a turbocharger;

FIG. 4 is a rear view schematic diagram of a turbocharger;

FIG. 5 is a schematic view of the present invention (the middle housing is not shown);

FIG. 6 is a schematic view of the angle change structure of FIG. 5;

FIG. 7 is a schematic structural view of the present invention;

fig. 8 is a schematic structural diagram of the present invention.

In the figure: the engine comprises a turbocharger 1, an air flow meter 2, an intercooler 3, an internal combustion engine 4, an exhaust pipe 5, a throttle valve 6, a middle shell 101, an air flow meter end back plate 102, a turbine back plate 103, an axial oil passage 104, a cooling water passage 105, an air passage 106, a first oil passage bypass 107, a second oil passage bypass 108, a water passage interface 109, a water passage plug 110 and an EGR valve 111.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments and the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention;

it should be noted that, in the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "both sides", "one end", "the other end", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: an improved exhaust gas recirculation device comprises a turbocharger 1, an air flow meter 2, an intercooler 3, an internal combustion engine 4 and an exhaust pipe 5, wherein the turbocharger 1 comprises a middle shell 101, one end of the middle shell 101 is provided with an air flow meter end back plate 102, the other end of the middle shell 101 is provided with a turbine back plate 103, the middle shell 101 is axially provided with an axial oil passage 104, one side of the axial oil passage 104 is provided with a first oil passage bypass 107, the first oil passage bypass 107 is positioned inside the middle shell 101, one end of the first oil passage bypass 107 penetrates through the air flow meter end back plate 102, the other side of the axial oil passage 104 is provided with a second oil passage bypass 108, the second oil passage bypass 108 is positioned at one end inside the middle shell 101 and is mutually communicated with the axial oil passage 104, a cooling water channel 105 and an air passage 106 are arranged inside the middle shell 101, the cooling water channel 105 and the air passage 106 are both wound outside the axial oil passage 104, and the cooling water channel 105 and the air passage 106 are both arranged in the middle shell 101 in an arc shape, the air channel 106 is sleeved on the outer wall of the cooling water channel 105, two ends of the cooling water channel 105 are respectively provided with a water channel connector 109, a water channel plug 110 is arranged in the middle of the cooling water channel 105, the first oil channel bypass 107, the second oil channel bypass 108, the water channel connector 109 and the water channel plug 110 respectively penetrate through the outer wall of the middle shell 101, two water channel connectors 109 respectively enter and exit, one end of the air channel 106 is connected to the turbine back plate 103, the other end of the air channel 106 is connected to the air flow meter end back plate 102, the air channel 106 is connected to one end of the turbine back plate 103, is an air inlet and penetrates through the turbine back plate 103, the air channel 106 is connected to one end of the air flow meter end back plate 102, is an air outlet and penetrates through the air flow meter end back plate 102, and the air channel 106 is further provided with an EGR valve 111; the outer end of the end back plate 102 of the air flow meter is respectively connected with the air flow meter 2 and the intercooler 3, one end of the intercooler 3, which is far away from the end back plate 102 of the air flow meter, is connected with the inlet end of the internal combustion engine 4 through the throttle valve 6, the outlet end of the internal combustion engine 4 is connected with one end of the turbine back plate 103, and one end of the turbine back plate 103 is also connected with the exhaust pipe 5.

The use method and the principle are as follows: the EGR system is approximately close to high-pressure EGR, but the existing cooling pipeline of the turbocharger 1 is used for cooling, so that the original EGR pipeline system and an EGR cooler can be eliminated, and the gas taking point is positioned behind the turbine back plate 103, so that the pressure and the temperature are relatively low, and the cooling and the control are easy; after the air outlet point is the end back plate 102 of the air flow meter, the exhaust gas flow speed is high, and the acceleration of the air compressor is not needed, so that the problem of exhaust gas pollution of low-pressure EGR does not exist, and the nickel-phosphorus coating pollution-resistant coating of the pinch roller can be considered to be eliminated. The present invention achieves circulation of exhaust gas by means of the intermediate housing 101 of the turbocharger 1 through innovation of the exhaust gas recirculation position. The hot end and the cold end are connected through an air passage 106 of the middle shell 101, the flow is controlled by the low exhaust gas temperature of cooling liquid in a cooling water channel 105 in the existing middle shell 101, and an EGR valve 111 is arranged in the middle shell 101; the air passages 106 are distributed close to the intermediate cooling water channel 105 to achieve the cooling purpose; in order to achieve a better cooling effect on the air passage 106, the intermediate body is not excluded from being slightly enlarged, and the air passage 106 and the cooling water channel 105 are lengthened to achieve the cooling effect; the EGR valve 111 is integrated in the intermediate body, making reasonable use of the limited space.

The utility model is not described in detail, but is well known to those skilled in the art.

Finally, it is to be noted that: although the present invention has been described in detail with reference to examples, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. An improved exhaust gas recirculation arrangement, characterized by: the turbocharger comprises a turbocharger (1), an air flow meter (2), an intercooler (3), an internal combustion engine (4) and an exhaust pipe (5), wherein the turbocharger (1) comprises a middle shell (101), one end of the middle shell (101) is provided with an air flow meter end back plate (102), the other end of the middle shell (101) is provided with a turbine back plate (103), the middle shell (101) is axially provided with an axial oil duct (104), one side of the axial oil duct (104) is provided with a first oil way bypass (107), the other side of the axial oil duct (104) is provided with a second oil way bypass (108), a cooling water channel (105) and an air passage (106) are arranged inside the middle shell (101), the cooling water channel (105) and the air passage (106) are all wound outside the axial oil duct (104), and the cooling water channel (105) and the air passage (106) are both arranged in the middle shell (101) in an arc shape, the air passage (106) is sleeved on the outer wall of the cooling water channel (105), water channel connectors (109) are respectively arranged at two ends of the cooling water channel (105), a water channel plug (110) is arranged in the middle of the cooling water channel (105), one end of the air passage (106) is connected to the turbine back plate (103), the other end of the air passage (106) is connected to the air flow meter end back plate (102), and the air passage (106) is further provided with an EGR valve (111); the outer end of the air flow meter end back plate (102) is respectively connected with an air flow meter (2) and an intercooler (3), one end, far away from the air flow meter end back plate (102), of the intercooler (3) is connected with the inlet end of the internal combustion engine (4) through a throttle valve (6), the outlet end of the internal combustion engine (4) is connected with one end of a turbine back plate (103), and one end of the turbine back plate (103) is further connected with an exhaust pipe (5).

2. An improved exhaust gas recirculation arrangement, as set forth in claim 1, wherein: the air passage (106) is connected to one end of the turbine back plate (103) and is an air inlet and penetrates through the turbine back plate (103).

3. An improved exhaust gas recirculation arrangement, as set forth in claim 1, wherein: the air passage (106) is connected to one end of the air flow meter end back plate (102) and is an air outlet and penetrates through the air flow meter end back plate (102).

4. An improved exhaust gas recirculation arrangement, as set forth in claim 1, wherein: the first oil path bypass (107), the second oil path bypass (108), the water channel connector (109) and the water channel plug (110) penetrate through the outer wall of the middle shell (101) respectively.

5. An improved exhaust gas recirculation arrangement, as set forth in claim 1, wherein: the first oil path bypass (107) is positioned in the middle shell (101), and one end of the first oil path bypass penetrates through the end back plate (102) of the air flow meter.

6. An improved exhaust gas recirculation arrangement, as set forth in claim 1, wherein: the second oil path bypass (108) is located inside the middle shell (101) and one end of the second oil path bypass is communicated with the axial oil path (104).