1. An EGR cooler having a bellows structure, comprising: the EGR cooling device comprises a shell, an EGR cooling core, a corrugated pipe, a flow distribution plate and water channel cooling fins;

the EGR cooling core body, the corrugated pipe, the flow distribution plate and the water channel cooling fins are all arranged in the shell, an air inlet port is formed in the shell, one end of the corrugated pipe is connected with the air inlet port, the other end of the corrugated pipe is connected with the EGR cooling core body, one end of the EGR cooling core body is connected with a pipeline, and the flow distribution plate and the water channel cooling fins are all arranged on the pipeline; the bellows is used for absorbing the thermal expansion force of the waste gas in the shell, the EGR cooling core body is used for cooling the temperature of the waste gas, and the water channel cooling fins are used for cooling the gas cooled by the EGR cooling core body again.

2. The EGR cooler with bellows structure according to claim 1, wherein a joint of the bellows and the intake port is coated with a nickel paste for solder adsorption into the joint of the bellows and the intake port in a vacuum high-temperature environment.

3. The EGR cooler with bellows structure according to claim 1, wherein a joint of the bellows and the EGR cooling core is coated with a nickel paste for solder adsorption into the joint of the bellows and the EGR cooling core in a vacuum high-temperature environment.

4. The EGR cooler having a bellows structure according to any one of claims 1 to 3, wherein the bellows is made of a high-temperature resistant and stretchable material, and the bellows has a flexibility.

5. The EGR cooler with a bellows structure according to claim 4, wherein an air outlet port is provided in the housing, the air outlet port being provided in the pipe, and the pipe being connected to a breather pipe.

6. The EGR cooler with bellows structure of claim 5, wherein the breather pipe is provided with a plurality of fixing frames, the fixing frames are detachably mounted on the breather pipe, and the breather pipe is used for conveying the treated exhaust gas.

7. The EGR cooler with a bellows structure according to claim 1, wherein the flow dividing plates are provided on upper and lower sides of the duct, and the flow dividing plates are configured to divide the cooled exhaust gas.

8. The EGR cooler having a bellows structure according to claim 1, wherein the water passage fin is provided around a circle on an outer surface of the pipe, the water passage fin is externally connected with a connection water passage, and a water inlet is provided at one end of the connection water passage and connected with an external water source.

9. The EGR cooler with a bellows structure according to claim 5, wherein a joint of the pipe and the breather pipe is coated with a nickel paste for solder-adsorption into the joint of the pipe and the breather pipe in a vacuum high-temperature environment.

10. The EGR cooler with a bellows structure according to claim 6, wherein the fixing frame is provided on both sides of the breather pipe, and a fixing plate is provided on the fixing frame, and a connecting hole is provided on the fixing plate.

Background

During the operation of the engine, a certain amount of high-temperature Exhaust Gas is required to be removed, nitrogen oxides or other harmful gases are usually present in the high-temperature Exhaust Gas, the Exhaust Gas of the engine needs to be treated by EGR (Exhaust Gas recirculation) and then discharged to the outside, EGR is an effective method for reducing the emission of the engine, the high-temperature Exhaust Gas from an Exhaust manifold generally needs to be cooled by an EGR cooler and then enters an intake manifold for combustion treatment again, and the remaining treated Exhaust Gas is discharged to the outside.

However, in the conventional EGR cooler, each part is usually welded by manual argon arc welding, and in the EGR cooler with such a welded structure, in a high-temperature and variable-pressure pulse environment, under the action of heat absorption in exhaust gas and cyclic reciprocating pulse, because each part is welded and fixed and does not have corresponding flexibility, expansion stress cannot be released, and the EGR cooler deforms and is scrapped under the action of thermal expansion, thermal stress and thermal fatigue, so that the service life is short.

Disclosure of Invention

The embodiment of the application provides an EGR cooler with bellows structure, and when the EGR cooler was heated, the bellows can the concertina movement offset the effect of thermal energy, thermal stress and thermal fatigue that come of transmission in the waste gas, prevent that the EGR cooler from taking place to warp and scrap to the life-span of extension product.

The application provides an EGR cooler with bellows structure includes: the EGR cooling device comprises a shell, an EGR cooling core, a corrugated pipe, a flow distribution plate and water channel cooling fins; the EGR cooling core body, the corrugated pipe, the flow distribution plate and the water channel cooling fins are all arranged in the shell, an air inlet port is formed in the shell, one end of the corrugated pipe is connected with the air inlet port, the other end of the corrugated pipe is connected with the EGR cooling core body, one end of the EGR cooling core body is connected with a pipeline, and the flow distribution plate and the water channel cooling fins are all arranged on the pipeline; the bellows is used for absorbing the thermal expansion force of the waste gas in the shell, the EGR cooling core body is used for cooling the temperature of the waste gas, and the water channel cooling fins are used for cooling the gas cooled by the EGR cooling core body again.

Optionally, a joint of the bellows and the air inlet port is coated with a nickel paste, and the nickel paste is used for being welded and adsorbed in the joint of the bellows and the air inlet port in a vacuum high-temperature environment.

Optionally, a joint of the corrugated tube and the EGR cooling core is coated with a nickel paste, and the nickel paste is used for being welded and adsorbed to the joint of the corrugated tube and the EGR cooling core in a vacuum high-temperature environment.

Optionally, the corrugated pipe is made of a high-temperature-resistant and extensible material, and the corrugated pipe is flexible.

Optionally, an air outlet port is arranged on the shell, the air outlet port is arranged on the pipeline, and the pipeline is connected with the vent pipe.

Optionally, be provided with a plurality of mount on the breather pipe, mount demountable installation is in on the breather pipe, the breather pipe is used for transmitting the waste gas after handling.

Optionally, the flow distribution plate is arranged on the upper side and the lower side of the pipeline, and the flow distribution plate is used for performing flow distribution treatment on cooled waste gas.

Optionally, the water channel cooling fins are arranged on the outer surface of the pipeline around a circle, a connecting water channel is externally connected to the water channel cooling fins, a water inlet is formed in one end of the connecting water channel, and the water inlet is connected with an external water source.

Optionally, a joint of the pipe and the vent pipe is coated with nickel paste, and the nickel paste is used for being welded and adsorbed in the joint of the pipe and the vent pipe in a vacuum high-temperature environment.

Optionally, the fixing frame is arranged on two sides of the vent pipe, a fixing plate is arranged on the fixing frame, and a connecting hole is formed in the fixing plate.

According to the technical scheme, the embodiment of the application has the following advantages:

the EGR cooler is provided with a shell, an EGR cooling core, a corrugated pipe, a flow distribution plate and water channel cooling fins; the EGR cooling core, the corrugated pipe, the flow distribution plate and the water channel cooling fins are all arranged in the shell, an air inlet port is formed in the shell, one end of the corrugated pipe is connected with the air inlet port, the other end of the corrugated pipe is connected with the EGR cooling core, one end of the EGR cooling core is connected with the pipeline, and the flow distribution plate and the water channel cooling fins are all arranged on the pipeline; according to the structure, the corrugated pipe is used for absorbing the thermal expansion force of the waste gas in the shell, the EGR cooling core body is used for cooling the temperature of the waste gas, the waste gas firstly passes through the corrugated pipe before the waste gas exhausted by an engine enters the EGR cooling core, and the corrugated pipe has the characteristics of vibration reduction, difficult damage and deformation resistance, the telescopic movement of the corrugated pipe offsets the effects of thermal expansion, thermal stress and thermal fatigue transmitted in the waste gas, the EGR cooler is prevented from deforming and scrapping, and the service life of a product is prolonged.

Drawings

Fig. 1 is a schematic structural view of an EGR cooler having a bellows structure according to the present application.

Detailed Description

At present, in a conventional EGR cooler, all parts are welded by adopting a manual argon arc welding mode, and the EGR cooler with the welded structure is in a high-temperature and variable-pressure pulse environment, and under the action of heat absorption in exhaust gas and cyclic reciprocating pulse, because all parts are welded and fixed and do not have corresponding flexibility, expansion stress cannot be released, and the EGR cooler deforms and is scrapped under the action of thermal expansion, thermal stress and thermal fatigue, so that the service life is short.

Based on this, this application provides an EGR cooler with bellows structure, and the EGR cooler is when being heated, and the bellows can the concertina movement offset the effect of thermal energy, thermal stress and thermal fatigue that come in the waste gas, prevents that the EGR cooler from taking place to warp and scrapping to the life-span of extension product.

Referring to fig. 1, the present application provides an EGR cooler having a bellows structure, including: the EGR cooling device comprises a shell, an EGR cooling core body 3, a corrugated pipe 2, a flow distribution plate 4 and water channel cooling fins 5; the EGR cooling core body 3, the corrugated pipe 2, the flow distribution plate 4 and the water channel cooling fins 5 are all arranged in the shell, an air inlet port 1 is formed in the shell, one end of the corrugated pipe 2 is connected with the air inlet port 1, the other end of the corrugated pipe 2 is connected with the EGR cooling core body 3, one end of the EGR cooling core body 3 is connected with a pipeline, and the flow distribution plate 4 and the water channel cooling fins are all arranged on the pipeline; bellows 2 is used for absorbing the thermal expansion power of the inside waste gas of casing, EGR cooling core 3 is used for cooling the temperature of waste gas and handles, water course fin 5 is used for the process the gas after EGR cooling core 3 cools off carries out heat dissipation once more and handles.

In the embodiment of the application, by arranging the EGR cooling core 3 and the bellows 2 in the EGR cooler, before the exhaust gas discharged from the engine enters the EGR cooling core for cooling, the exhaust gas can firstly enter the bellows 2 from the air inlet port 1 of the housing, wherein, it should be noted that, because the bellows 2 has the characteristics of vibration reduction, uneasiness for breaking and deformation resistance, the bellows 2 can move telescopically to counteract the effects of thermal expansion, thermal stress and thermal fatigue transferred from the exhaust gas, thereby prolonging the service life of the product, and the bellows 2 has the characteristics of high exhaust gas flow efficiency, good heat dissipation performance and the like, the bellows 2 can be welded at the air inlet port 1 to rapidly reduce the temperature of the exhaust gas, thereby avoiding the thermal fatigue crack generated by the EGR cooling core 3 under the action of high-temperature gas, after the exhaust gas passes through the bellows 2, the thermal effect force and the thermal expansion force existing in the exhaust gas can be counteracted partially, the offset exhaust gas enters the EGR cooling core 3 to cool the exhaust gas, and the cooled exhaust gas enters the intake manifold and reenters the intake port of the engine for use, where it should be noted that the treated exhaust gas is branched by the flow dividing plate 4, and a part of the exhaust gas branched by the flow dividing plate 4 is further cooled by the water channel cooling fins 5 on the pipeline and enters the engine for reuse, and the other part of the exhaust gas is discharged to the outside and enters the air.

Furthermore, the corrugated pipe 2 is used for absorbing the thermal expansion force of the exhaust gas in the shell, the EGR cooling core body 3 is used for cooling the temperature of the exhaust gas, the exhaust gas firstly passes through the corrugated pipe 2 before the exhaust gas discharged by the engine enters the EGR cooling core, and the telescopic motion of the corrugated pipe 2 counteracts the effects of thermal expansion, thermal stress and thermal fatigue transmitted in the exhaust gas due to the characteristics of vibration reduction, difficult damage and deformation resistance of the corrugated pipe 2, so that the EGR cooler is prevented from deforming and scrapping, and the service life of the product is prolonged.

Optionally, a joint of the bellows 2 and the air inlet port 1 is coated with a nickel paste, and the nickel paste is used for being welded and adsorbed in the joint of the bellows 2 and the air inlet port 1 in a vacuum high-temperature environment; and a joint of the corrugated pipe 2 and the EGR cooling core body 3 is coated with nickel paste, and the nickel paste is used for being welded and adsorbed to the joint of the corrugated pipe 2 and the EGR cooling core body 3 in a vacuum high-temperature environment.

In the embodiment of the present application, a joint between one end of the bellows 2 and the intake port 1 is mainly coated with nickel paste, and a joint between the other end of the bellows 2 and the EGR cooling core 3 is also coated with nickel paste, it should be noted that the nickel paste coated at the joint needs to be welded under a vacuum high-temperature environment, compared with a conventional manual argon arc welding method, the welding is performed under vacuum, the welding strength is high, and the labor intensity and the production cost can be reduced, wherein the welding method of the nickel paste is to place the connecting part with the bellows 2 in a high-temperature vacuum environment, and the nickel paste is tightly adsorbed in the joint of the bellows 2 after being melted.

Optionally, the corrugated pipe 2 is made of a high-temperature-resistant and extensible material, and the corrugated pipe 2 is flexible.

In this application embodiment, because bellows 2 is direct and contacts with engine exhaust high temperature waste gas, so in order to guarantee that bellows 2 can carry out effective work that lasts, bellows 2 need set up to be high temperature resistant and possess better ductility material and make, when waste gas enters into bellows 2, thermal effect power and the thermal expansion power that exist in can effectual absorption waste gas, wherein, it is required to explain that, in this application, do not do specific restriction to the material of bellows 2.

Optionally, an air outlet port is arranged on the housing, the air outlet port is arranged on the pipeline, and the pipeline is connected with the vent pipe 6; be provided with a plurality of mount 7 on the breather pipe 6, mount 7 demountable installation be in on the breather pipe 6, breather pipe 6 is used for transmitting the waste gas after handling.

Optionally, the flow distribution plate 4 is disposed on the upper side and the lower side of the pipeline, and the flow distribution plate 4 is used for performing flow distribution treatment on the cooled exhaust gas; the water channel cooling fins 5 are arranged on the outer surface of the pipeline in a circle, a connecting water channel is externally connected to the water channel cooling fins 5, a water inlet is formed in one end of the connecting water channel, and the water inlet is connected with an external water source; the joint of the pipeline and the vent pipe 6 is coated with nickel paste, and the nickel paste is used for being welded and adsorbed to the joint of the pipeline and the vent pipe 6 in a vacuum high-temperature environment; the fixing frame 7 is arranged on two sides of the vent pipe 6, a fixing plate is arranged on the fixing frame 7, and a connecting hole is formed in the fixing plate.

In this application embodiment, in the pipeline with the junction of breather pipe 6 has scribbled the nickel cream, mainly is for preventing that waste gas from revealing from the junction, and on the other hand mainly is for carrying out welding process, adopts the welding method under the high temperature vacuum environment, can the effectual welding mode that replaces the manual argon arc of people to weld, and the welding is convenient, and sound construction sets up mount 7 on breather pipe 6, mainly is for the waste gas after the transportation is handled.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

It is intended that the foregoing description of the disclosed embodiments enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.