CN217538875U

CN217538875U - EGR system and engine assembly

Info

Publication number: CN217538875U
Application number: CN202221714213.7U
Authority: CN
Inventors: 郭学敏; 史鹏礼; 夏春雨; 李军; 常兴宇
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-10-04
Anticipated expiration: 2032-06-28

Abstract

The utility model belongs to the technical field of the engine, a EGR system and engine assembly is disclosed, this EGR system includes EGR system intake pipe, first trachea and second trachea, EGR system intake pipe has the inlet end and gives vent to anger the end, inlet end and engine exhaust pipe intercommunication, first trachea has first end and second end, first end and the end intercommunication of giving vent to anger, the pipeline section intercommunication before the compressor import in second end and the engine intake pipe, and be equipped with first control valve on the first trachea, the second trachea has third end and fourth end, third end and the end intercommunication of giving vent to anger, pipeline section intercommunication after the compressor export in fourth end and the intake pipe, and the above-mentioned second control valve that is equipped with of second trachea, when outdoor ambient temperature is lower, this EGR system can avoid the problem that the comdenstion water that produces after the mixing of outside air and waste gas harms the compressor blade.

Description

EGR system and engine assembly

Technical Field

The utility model relates to the technical field of engines, especially, relate to an EGR system and engine assembly.

Background

An Exhaust Gas Recirculation (EGR) system is a system for recycling Exhaust Gas by returning part of Exhaust Gas discharged from an engine to the engine, and Exhaust Gas discharged from the engine contains a large amount of CO ₂ Equal polyatomic gas, CO ₂ When the gas cannot be combusted, the gas can absorb a large amount of heat due to high specific heat capacity, so that the highest combustion temperature of the mixed gas in the engine cylinder is reduced, the knocking tendency in the engine cylinder can be further reduced, the compression ratio is improved, and the heat efficiency of the engine is improved.

In the prior art, an air outlet pipe of an EGR system is communicated with an air inlet pipe of an engine, the connecting position of the air outlet pipe is positioned in front of an air inlet of an air compressor, and waste gas in the EGR system is mixed with fresh air, then sequentially passes through the air compressor, an intercooler and an air inlet manifold and enters the engine, so that the waste gas is recycled.

However, when the external environment temperature is low in autumn and winter, the temperature of the fresh air entering the air inlet pipe of the engine is low, and when the fresh air with low temperature is mixed with the waste gas, condensed water is generated and enters the compressor along with the mixed gas, which damages blades in the compressor which operate at high speed, further affects the use performance of the compressor, and even shortens the service life of the compressor. Therefore, it is desirable to provide an EGR system and an engine assembly to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an EGR system, when outdoor ambient temperature is lower, this EGR system can avoid the problem of the comdenstion water damage compressor blade that produces behind the external air and the waste gas mixture.

To achieve the purpose, the utility model adopts the following technical proposal:

an EGR system for returning a part of exhaust gas discharged from an engine to the engine, an exhaust port and an exhaust pipe of the engine being communicated, an air inlet and an air inlet pipe of the engine being communicated, an air compressor being provided in the air inlet pipe, the air compressor having an inlet and an outlet, the outlet being communicated with the air inlet of the engine, the EGR system comprising:

the EGR system air inlet pipe is provided with an air inlet end and an air outlet end, and the air inlet end can be communicated with the exhaust pipe;

the first air pipe is provided with a first end and a second end, the first end is communicated with the air outlet end, the second end is used for being communicated with the air inlet pipe, the communication position of the second end and the air inlet pipe is positioned in front of an inlet of the air compressor, and the first air pipe is provided with a first control valve;

and the second air pipe is provided with a third end and a fourth end, the third end is communicated with the air outlet end, the fourth end is communicated with the air inlet pipe, the communication position of the fourth end and the air inlet pipe is positioned behind the outlet of the air compressor, and a second control valve is arranged on the second air pipe.

Optionally, the EGR system further includes a suction pump, the suction pump is disposed on the air intake pipe of the EGR system, and an air outlet of the suction pump is communicated with the third end.

Optionally, the air outlet of the air pump is also communicated with the first end.

Optionally, the EGR system further comprises a filter disposed on the EGR system intake pipe.

Optionally, the filter is proximate the intake end.

Optionally, the filter is a screen.

Optionally, the EGR system further comprises an EGR cooler arranged at the EGR system inlet pipe for cooling the exhaust gases in the EGR system inlet pipe.

Optionally, the EGR system further includes a water-cooling device, the water-cooling device is communicated with the EGR cooler through a refrigerant pipe, and the water-cooling device is configured to supply a refrigerant to the EGR cooler.

Optionally, the EGR system further comprises a thermal insulation member disposed on the intake pipe of the EGR system and between the intake end and the EGR cooler.

Another object of the present invention is to provide an engine assembly, when the ambient temperature is lower, the compressor failure rate of the engine assembly is lower.

an engine assembly comprises an engine and the EGR system, wherein an exhaust pipe of the engine is communicated with an air inlet end, and an air inlet pipe of the engine is communicated with a second end and a fourth end respectively.

Has the advantages that:

the utility model provides a EGR system sets up first trachea and second trachea, the first end of first trachea and the end intercommunication of giving vent to anger of EGR system intake pipe, the second end of first trachea and the intake pipe intercommunication of engine, and the intercommunication department of second end and intake pipe is located before the import of compressor, be equipped with first control valve on the first trachea, the third end of second trachea and the end intercommunication of giving vent to anger of EGR system intake pipe, the fourth end of second trachea and the intake pipe intercommunication of engine, and the intercommunication department of fourth end and intake pipe is located after the export of compressor, be equipped with the second control valve on the second trachea, when outdoor ambient temperature is not too low, first control valve opens, the second control valve closes, the waste gas of engine gets into the intake pipe before the compressor import through first trachea, waste gas mixes with the outside air in this pipeline section, then the mixed gas gets into the compressor pressure boost, the mixed gas after the pressure boost is discharged from the export of compressor, get into the engine air inlet through the intake pipe; when the outdoor environment temperature is low, the first control valve is closed, the second control valve is opened, at the moment, the exhaust gas of the engine enters the air inlet pipe behind the outlet of the air compressor through the second air pipe, meanwhile, the outside air enters the air compressor through the air inlet pipe for pressurization, the pressurized outside air is discharged from the outlet of the air compressor and is mixed with the exhaust gas in the pipe section of the air inlet pipe behind the outlet of the air compressor, then, the mixed gas enters the air inlet of the engine through the air inlet pipe, therefore, the problem that the blades of the air compressor are damaged by condensed water generated after the outside air and the exhaust gas are mixed when the outdoor environment temperature is low is avoided, further, powerful guarantee is provided for the normal operation of the air compressor, the failure rate of the air compressor is reduced, and the service life of the air compressor is prolonged.

The utility model provides an engine assembly adopts foretell EGR system, and when ambient temperature was lower, this engine assembly's compressor fault rate was lower, and consequently this engine assembly has higher operational reliability.

Drawings

Fig. 1 is a schematic structural diagram of a connection system of an EGR system and an engine according to the present embodiment.

In the figure:

100. an EGR system intake pipe; 110. an air pump; 120. a filter; 131. an EGR cooler; 132. a water-cooling device; 140. a thermal insulation member; 200. an air inlet pipe; 210. a compressor; 220. an intercooler; 230. a throttle valve; 300. a first air pipe; 310. a first control valve; 400. a second air pipe; 410. a second control valve; 600. an engine; 700. an exhaust pipe; 710. a supercharger; 720. a three-way catalyst; 900. an intake manifold.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The embodiment provides an EGR system, which is used for sending part of exhaust gas exhausted by an engine back to the engine, an exhaust port of the engine is communicated with an exhaust pipe, an air inlet of the engine is communicated with an air inlet pipe, an air compressor is arranged on the air inlet pipe, the air compressor is provided with an inlet and an outlet, the outlet is communicated with the air inlet of the engine, and when the outdoor environment temperature is low, the EGR system can avoid the problem that condensed water generated after external air and the exhaust gas are mixed can damage blades of the air compressor.

Specifically, as shown in fig. 1, the EGR system includes an EGR system intake pipe 100, a first intake pipe 300 and a second intake pipe 400, the EGR system intake pipe 100 has an intake end and an exhaust end, the intake end can be communicated with an exhaust pipe 700, the first intake pipe 300 has a first end and a second end, the first end is communicated with the exhaust end, the second end is used for being communicated with an intake pipe 200, and the communication position of the second end and the intake pipe 200 is located in front of an inlet of the compressor 210, a first control valve 310 is arranged on the first intake pipe 300, the second intake pipe 400 has a third end and a fourth end, the third end is communicated with the exhaust end, the fourth end is used for being communicated with the intake pipe 200, and the communication position of the fourth end and the intake pipe 200 is located behind an outlet of the compressor 210, and a second control valve 410 is arranged on the second intake pipe 400.

When the outdoor environment temperature is not too low, the first control valve 310 is opened, the second control valve 410 is closed, at the moment, the EGR system realizes the function of a low-pressure EGR system, the exhaust gas of the engine 600 enters the air inlet pipe 200 in front of the inlet of the compressor 210 through the first air pipe 300, the exhaust gas in the pipe section is mixed with the outside air, then the mixed gas enters the compressor 210 for pressurization, the pressurized mixed gas is discharged from the outlet of the compressor 210 and enters the air inlet of the engine 600 through the air inlet pipe 200; when the outdoor environment temperature is low, the first control valve 310 is closed, the second control valve 410 is opened, at this time, the EGR system realizes the function of a high-pressure EGR system, the exhaust gas of the engine 600 enters the air inlet pipe 200 behind the outlet of the compressor 210 through the second air pipe 400, meanwhile, the external air enters the compressor 210 through the air inlet pipe 200 to be pressurized, the pressurized external air is discharged from the outlet of the compressor 210 and is mixed with the exhaust gas in the air inlet pipe section behind the outlet of the compressor 210, and then the mixed gas enters the air inlet of the engine 600 through the air inlet pipe 200, so that the problem that the blades of the compressor 210 are damaged by condensed water generated after the external air and the exhaust gas are mixed when the outdoor environment temperature is low is avoided, further powerful guarantee is provided for the normal operation of the compressor 210, the fault rate of the compressor 210 is reduced, and the service life of the compressor 210 is prolonged.

Optionally, as shown in fig. 1, an intercooler 220 is further disposed on the intake pipe 200, and the intercooler 220 is disposed at one end of an outlet of the compressor 210, and cools the pressurized gas to reduce a heat load of the engine 600.

Optionally, as shown in fig. 1, the intake pipe 200 is further provided with a throttle valve 230, the throttle valve 230 is disposed on a pipe section behind an outlet of the compressor 210, a communication position of a fourth end of the second air pipe 400 and the intake pipe 200 is located behind the throttle valve 230, when the first control valve 310 is opened and the second control valve 410 is closed, the throttle valve 230 controls an input amount of the mixed gas pressurized by the compressor 210, and when the first control valve 310 is closed and the second control valve 410 is opened, the throttle valve 230 controls an input amount of the outside air pressurized by the compressor 210. Of course, in other embodiments, the communication between the fourth end of the second air pipe 400 and the air intake pipe 200 may be located before the throttle valve 230.

Optionally, as shown in fig. 1, the EGR system further includes a suction pump 110, the suction pump 110 is disposed on the intake pipe 100 of the EGR system, and an outlet of the suction pump 110 is communicated with a third end of the second air pipe 400, so as to increase the flow rate and the flow velocity of the exhaust gas entering the second air pipe 400, and improve the EGR rate of the EGR system.

Further, as shown in fig. 1, the outlet of the air pump 110 is also communicated with the first end of the first air pipe 300 to increase the flow rate and flow speed of the exhaust gas entering the first air pipe 300, and the flow rate and flow speed of the exhaust gas entering the EGR system can be improved no matter whether the exhaust gas in the EGR system enters the first air pipe 300 or the second air pipe 400. In the technical solution provided in this embodiment, the first control valve 310 and the second control valve 410 only have an opening and closing function, but do not have a function of adjusting flow rate, and the amount of exhaust gas entering the engine 600 through the first air pipe 300 or the second air pipe 400 is controlled by the air pump 110, thereby realizing uniform management of the amount of exhaust gas introduced.

Optionally, as shown in fig. 1, the EGR system further includes a filter 120, and the filter 120 is disposed on the intake pipe 100 of the EGR system to filter the exhaust gas entering the intake pipe of the RGR system, so as to reduce the probability of corrosion and aging of the components through which the exhaust gas flows.

Preferably, as shown in fig. 1, the filter 120 is close to the intake end to filter the exhaust gas just entering the intake pipe 100 of the EGR system, so as to avoid the problem that the unfiltered exhaust gas flows through individual components in the EGR system, which causes high corrosion rate or high aging rate of the individual components.

Optionally, the filter 120 is a screen to reduce particulate matter entering the RGR system inlet 100. Of course, in other embodiments, the filter 120 may also be a particle trap or other device having a filtering function.

Optionally, as shown in fig. 1, the EGR system further comprises an EGR cooler 131, and the EGR cooler 131 is disposed at the EGR system intake pipe 100 and is used for cooling the exhaust gas in the EGR system intake pipe 100 to further reduce the thermal load of the engine 600 and improve the thermal efficiency of the engine 600.

Alternatively, the EGR cooler 131 may be a cooling plate disposed adjacent to the EGR system intake pipe 100, or may be a cooling pipe disposed around the EGR system intake pipe 100, which is determined according to actual circumstances and is not particularly limited herein.

Preferably, as shown in fig. 1, the EGR system further includes a water-cooled cooling device 132, the water-cooled cooling device 132 is in communication with the EGR cooler 131 through a refrigerant pipe, the water-cooled cooling device 132 is configured to supply a refrigerant to the EGR cooler 131, cooling efficiency of the water-cooled cooling device 132 is high, and cooling effect of the EGR cooler 131 can be improved. Of course, in other embodiments, an air-cooled cooling device may be used, and the air-cooled cooling device and the EGR cooler 131 may be communicated with each other through a refrigerant pipe, depending on the actual situation.

Preferably, in the technical solution provided by this embodiment, the water-cooled cooling device 132 and the cooling device of the engine 600 are two independent cooling devices, so as to improve the cooling capability of the EGR cooler 131 and achieve the effect of further improving the thermal efficiency of the engine 600.

Optionally, as shown in fig. 1, the EGR system further includes a heat insulation member 140, where the heat insulation member 140 is disposed on the intake pipe 100 of the EGR system and located between the intake end and the EGR cooler 131, so as to achieve a heat insulation effect on the exhaust gas that is not cooled in the intake pipe 100 of the EGR system, and in an actual use process, in order to reduce heat radiation of the exhaust gas to surrounding components that are not high in temperature resistance, a certain heat insulation safety distance may be left between the intake pipe 100 of the EGR system and the surrounding components, and a space of the car cabin is very limited, and the heat insulation member 140 is disposed between the intake end and the EGR cooler 131 to insulate the exhaust gas that is not cooled, so as to have an effect of reducing the heat insulation safety distance, so that the intake pipe 100 of the EGR system and the surrounding components are arranged compactly, and have an effect of reducing the space of the car cabin occupied by the EGR system.

Alternatively, the heat insulation member 140 may be a heat insulation sleeve sleeved outside the EGR system air inlet pipe 100, or may be a heat insulation plate installed outside the EGR system air inlet pipe 100, which is determined according to actual situations, and is not limited herein.

The EGR system that this embodiment provided can realize low pressure EGR system function, can realize high pressure EGR system function again: when the outdoor ambient temperature is not too low, the first control valve 310 is opened and the second control valve 410 is closed, at which time the EGR system enables the low-pressure EGR system function; when the outdoor ambient temperature is low, the second control valve 410 is opened and the first control valve 310 is closed, at which time the EGR system enables the high pressure EGR system function. Secondly, the air intake pipe 100 of the EGR system is provided with the air pump 110, and an outlet of the air pump 110 is respectively communicated with the first end of the first air pipe 300 and the third end of the second air pipe 400, so that the flow rate and the flow velocity of the exhaust gas entering the EGR system are improved, and the EGR rate is further improved. Again, the EGR system is provided with a separate water-cooled cooling device 132 to increase the cooling capacity of the EGR cooler 131, further reducing the temperature of the exhaust gas in the intake pipe 100 of the EGR system, and thereby increasing the thermal efficiency of the engine 600. And the arrangement of the heat insulation piece 140 reduces the heat insulation safety distance between the air inlet pipe 100 of the EGR system and surrounding parts, and has the effect of reducing the space of the automobile cabin occupied by the EGR system.

The present embodiment also provides an engine assembly having a low rate of compressor 210 failure when the ambient temperature is low.

Specifically, as shown in fig. 1, the engine assembly includes an engine 600, an exhaust pipe 700, and an intake pipe 200, an exhaust port of the engine 600 communicates with an intake end of an EGR system intake pipe 100 through the exhaust pipe 700, and an intake port of the engine 600 communicates with a second end of a first air pipe 300 and a fourth end of a second air pipe 400 through the intake pipe 200, respectively.

By adopting the EGR system, when the ambient temperature is low, the failure rate of the compressor 210 of the engine assembly is low, so that the engine assembly has high operation reliability.

Further, as shown in fig. 1, a supercharger 710 and a three-way catalyst 720 are provided on the exhaust pipe 700 to supercharge and purify the exhaust gas in the exhaust pipe 700.

Further, a particle trap (not shown) is disposed on the exhaust pipe 700 to filter particulate matter in the exhaust gas in the exhaust pipe 700.

Further, as shown in fig. 1, intake pipe 200 communicates with an intake port of engine 600 through intake manifold 900 to perform gas splitting at the inlet of engine 600.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An EGR system for returning a part of exhaust gas discharged from an engine to the engine, an exhaust port of the engine being communicated with an exhaust pipe, an air inlet of the engine being communicated with an air inlet pipe, the air inlet pipe being provided with a compressor having an inlet and an outlet, the outlet being communicated with the air inlet of the engine, the EGR system comprising:

an EGR system intake pipe (100), the EGR system intake pipe (100) having an intake end and an exhaust end, the intake end being communicable with the exhaust pipe (700);

the first air pipe (300) is provided with a first end and a second end, the first end is communicated with the air outlet end, the second end is used for being communicated with the air inlet pipe (200), the communication position of the second end and the air inlet pipe (200) is positioned in front of the inlet of the compressor (210), and a first control valve (310) is arranged on the first air pipe (300);

the second air pipe (400), the second air pipe (400) have third end and fourth end, the third end with give vent to anger and hold the intercommunication, the fourth end be used for with intake pipe (200) intercommunication, and the fourth end with the intercommunication department of intake pipe (200) is located behind the export of compressor (210), be equipped with second control valve (410) on the second air pipe (400).

2. The EGR system of claim 1 further comprising a suction pump (110), wherein the suction pump (110) is disposed on the EGR system intake pipe (100), and an air outlet of the suction pump (110) is in communication with the third end.

3. The EGR system of claim 2 wherein the air outlet of the extraction pump (110) is also in communication with the first end.

4. An EGR system according to any of claims 1-3, characterized in that the EGR system further comprises a filter (120), the filter (120) being arranged in the EGR system inlet pipe (100).

5. The EGR system of claim 4, wherein the filter (120) is proximate the intake end.

6. The EGR system of claim 4 wherein the filter (120) is a screen.

7. An EGR system according to any of claims 1-3, characterized in that the EGR system further comprises an EGR cooler (131), and that the EGR cooler (131) is arranged at the EGR system inlet line (100) for cooling exhaust gases in the EGR system inlet line (100).

8. The EGR system according to claim 7, further comprising a water-cooled cooling device (132), the water-cooled cooling device (132) communicating with the EGR cooler (131) through a refrigerant pipe, the water-cooled cooling device (132) supplying a refrigerant to the EGR cooler (131).

9. The EGR system of claim 7 further comprising a thermal shield (140), the thermal shield (140) being disposed on the EGR system intake pipe (100) between the intake end and the EGR cooler (131).

10. An engine assembly, characterized by comprising an engine (600) and an EGR system according to any of claims 1-9, the exhaust pipe (700) of the engine (600) communicating with the intake end, and the intake pipe (200) of the engine (600) communicating with the second end and the fourth end, respectively.