CN218862759U

CN218862759U - EGR (exhaust gas recirculation) system of air-cooled three-cylinder diesel engine

Info

Publication number: CN218862759U
Application number: CN202223436024.0U
Authority: CN
Inventors: 张超; 王国民; 刘海云; 郭国祥
Original assignee: Beinei Diesel Engine Tianjin Co ltd
Current assignee: Beinei Tianjin Technology Co ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-04-14
Anticipated expiration: 2032-12-21

Abstract

The utility model provides an air-cooled three-cylinder diesel engine EGR system, including the diesel engine body, the diesel engine body includes cylinder and booster, be connected with exhaust manifold and inlet manifold on the cylinder, exhaust manifold's exit end is connected with EGR cooler intake pipe, the exit end of EGR cooler intake pipe is connected with the air inlet of the box EGR cooler of forced air cooling, the gas outlet of the box EGR cooler of forced air cooling is connected with EGR cooler outlet duct, EGR cooler outlet duct is connected with inlet manifold through the EGR valve, the exit end of booster is linked together through booster outlet duct and inlet manifold, the lower extreme of the box EGR cooler of forced air cooling is provided with cold wind feeding device, the utility model has the advantages of simple structure optimizes the installation overall arrangement, accords with air-cooled engine structural feature.

Description

Air-cooled three-cylinder diesel engine EGR system

Technical Field

The utility model belongs to the technical field of the diesel engine, especially, relate to an air-cooled three jar diesel engine EGR system.

Background

The EGR technology is one of the most effective measures for reducing the NOx emission of the diesel engine at present, the basic principle is that the partially combusted waste gas is introduced into an air inlet pipe from an exhaust manifold through an EGR valve, the partially combusted waste gas is mixed with fresh air and then enters into combustion in a combustion chamber again, the combustion speed is slowed down to reduce the combustion temperature, the generation quantity of the NOx is reduced, and the degree of pollution to the atmosphere is reduced.

Disclosure of Invention

The to-be-solved problem of the utility model is to provide a simple structure, optimize installation overall arrangement, accord with the cold three jar diesel engine EGR system of air cooled engine structural feature.

In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides an air-cooled three-cylinder diesel engine EGR system, includes the diesel engine body, the diesel engine body includes cylinder and booster, be connected with exhaust manifold and intake manifold on the cylinder, exhaust manifold's exit end is connected with EGR cooler intake pipe, the exit end of EGR cooler intake pipe is connected with air-cooled box EGR cooler's air inlet, air-cooled box EGR cooler's gas outlet is connected with EGR cooler outlet duct, EGR cooler outlet duct is connected with intake manifold through the EGR valve, the exit end of booster is linked together with intake manifold through the booster outlet duct, air-cooled box EGR cooler's lower extreme is provided with cold wind feeding device.

Further, the cold air supply device comprises an exhaust fan fixedly arranged on the diesel engine body, an air guide cover is fixedly arranged at the air outlet end of the exhaust fan, and the free end of the air guide cover extends to the lower end of the air cooling box type EGR cooler and is in contact connection with the side wall of the air cooling box type EGR cooler through a wind shield.

Furthermore, a driving mechanism is arranged on the suction fan, the driving mechanism comprises a main shaft belt pulley fixedly connected with a main shaft of the diesel engine body, and the main shaft belt pulley is in belt transmission connection with a fan belt pulley on the suction fan through a tension wheel.

Further, box EGR cooler of forced air cooling includes the box, the rear side of box sets up for the opening, set up air inlet and gas outlet on the antetheca of box, be provided with coil pipe type cooling tube in the box, the both ends of coil pipe type cooling tube respectively with air inlet and gas outlet fixed connection, still be provided with the wave fin in the box, the wave fin distributes around coil pipe type cooling tube, be provided with the venthole on the lower wall of box, be provided with the bar exhaust vent on the upper wall of box.

Furthermore, the rear sides of the upper wall and the lower wall of the box body are oppositely provided with fixing plates, threaded holes are formed in the fixing plates, and the box body is fixed to a flywheel shell of the diesel engine body through the fixing plates and the threaded holes through bolts.

Compared with the prior art, the utility model has the advantages and beneficial effects be:

1. the utility model discloses a design of EGR system combines the characteristics of air-cooled engine, with some high-temperature gas of exhaust in the cylinder enter into air-cooled box EGR cooler and cool off, air-cooled box EGR cooler directly cools off through cold wind feeding device, does not need additionally to increase water cooling system, mix the entering cylinder of the required waste gas volume of EGR valve control and the intake in the booster after the cooling back and participate in the burning once more, make the burning rate slow down in order to reduce combustion temperature, thereby reduce NOx's formation quantity, reduce the degree to the atmosphere pollution;

2. the utility model discloses a structural design of forced air cooling box EGR cooler increases area of contact through making high-temperature gas flow through coiled pipe type cooling tube, improves heat-sinking capability, arranges wave fin around the cooling tube simultaneously, further improves heat-sinking capability to utilize the wind scooper to lead the wind that the blower fan produced into the box through the air supply hole in, take away the heat on cooling tube and the fin, realize the cooling of high-temperature gas, equipment structure is simple, and the cooling effect is good;

3. the utility model discloses a box EGR cooler of forced air cooling is direct through fixed plate and screw hole bolt fastening to the flywheel housing of diesel engine body, and mounting structure is simple, practices thrift the space, has optimized the installation overall arrangement.

Drawings

Fig. 1 is the utility model relates to an air-cooled three jar diesel engine EGR system's overall structure sketch map.

Fig. 2 is a schematic front view of the structure of fig. 1.

Fig. 3 is a schematic top view of the structure of fig. 1.

Fig. 4 is a schematic diagram of the right side structure of fig. 1.

Fig. 5 is a left side view of the structure of fig. 1.

Fig. 6 is the utility model relates to a forced air cooling three jar diesel engine EGR system gets rid of box EGR cooler's of forced air cooling structure schematic diagram.

Fig. 7 is a schematic view of the whole structure of the air-cooled box type EGR cooler of the present invention.

Fig. 8 is a rear view of the structure of fig. 7.

Fig. 9 is a schematic bottom view of the structure of fig. 7.

In the figure: 1-a diesel engine body; 2-a cylinder; 3-a supercharger; 4-an exhaust manifold; 5-an intake manifold; 6-EGR cooler inlet pipe; 7-air cooling box type EGR cooler; 8-an exhaust gas outlet pipe of the EGR cooler; 9-an EGR valve; 10-a supercharger air outlet pipe; 11-a suction fan; 12-a wind scooper; 13-a wind deflector; 14-a main shaft pulley; 15-a tension wheel; 16-a fan pulley; 17-a box body; 18-an air inlet; 19-outlet; 20-coil type radiating pipe; 21-wave shaped heat dissipation fins; 22-air supply holes; 23-strip air outlet holes; 24-a fixing plate; 25-a threaded hole; 26-flywheel housing.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1, 2, 3 and 6, an air-cooled three-cylinder diesel engine EGR system comprises a diesel engine body 1, the diesel engine body 1 comprises an air cylinder 2 and a supercharger 3, the air cylinder 2 is connected with an exhaust manifold 4 and an air inlet manifold 5, the outlet end of the exhaust manifold 4 is connected with an EGR cooler air inlet pipe 6, the outlet end of the EGR cooler air inlet pipe 6 is connected with the air inlet of an air-cooled box type EGR cooler 7, the air outlet of the air-cooled box type EGR cooler 7 is connected with an EGR cooler air outlet pipe 8, the EGR cooler air outlet pipe 8 is connected with the air inlet manifold 5 through an EGR valve 9, the outlet end of the supercharger 3 is communicated with the air inlet manifold 5 through a supercharger air outlet pipe 10, and the lower end of the air-cooled box type EGR cooler 7 is provided with a cold air supply device.

Specifically, exhaust some high-temperature gas flows through exhaust manifold 4 in proper order in the cylinder 2, EGR cooler intake pipe 6, air-cooled box EGR cooler 7 and EGR cooler outlet duct 8, then mix the back through the required waste gas volume of EGR valve 9 control with the gas after cooling and the intake of booster 3 and participate in the burning in cylinder 2 after intake manifold 5 mixes, make combustion speed slow down in order to reduce combustion temperature to reduce NOx's formation quantity, reduce the degree to atmospheric pollution, the utility model discloses a design of EGR system combines air-cooled engine's characteristics, and air-cooled box EGR cooler 7 directly cools off through cold wind feeding device, does not need additionally to increase water cooling system, optimizes structural design.

Additionally, the utility model discloses well EGR valve passes through its air input of ECU control, and this control system is ripe prior art, consequently no longer gives unnecessary details.

Further, the cold air supply device comprises a suction fan 11 fixedly arranged on the diesel engine body 1, an air guide cover 12 is fixedly arranged at an air outlet end of the suction fan 11, and a free end of the air guide cover 12 extends to the lower end of the air cooling box type EGR cooler 7 and is in contact connection with the side wall of the air cooling box type EGR cooler 7 through a wind shield 13.

The utility model discloses a set up wind scooper 12 at the air-out end of blower fan 11, lead to 7 departments of box EGR cooler of forced air cooling through wind scooper 12 with the wind that blower fan 11 produced, carry out cooling treatment to the high-temperature gas who gets into box EGR cooler of forced air cooling 7 to play the effect of blockking through 13 deep beads of wind board to the wind that blower fan 11 produced, make more of it enter into box EGR cooler of forced air cooling 7 in, improve its cooling capacity.

In addition, through the setting of wind scooper 12, also play good cooling effect to the cylinder cap and the cylinder liner of arranging on wind scooper 12, improved the part efficiency of each spare part, increased the life of cylinder 2.

As shown in fig. 4, a driving mechanism is arranged on the suction fan 11, the driving mechanism includes a main shaft belt pulley 14 fixedly connected with a main shaft of the diesel engine body 1, and the main shaft belt pulley 14 is in belt transmission connection with a fan belt pulley 16 on the suction fan 11 through a tension pulley 15.

Specifically, the main shaft belt pulley 14, the tension wheel 15 and the fan belt pulley 16 are in transmission connection through a belt, and when the diesel engine body 1 works, the main shaft rotates to drive the main shaft belt pulley 14 to rotate so as to drive the fan belt pulley 16 to rotate, so that the suction fan 11 works.

As shown in fig. 7-9, the air-cooled box type EGR cooler 7 includes a box body 17, the rear side of the box body 17 is provided with an opening, an air inlet 18 and an air outlet 19 are formed in the front wall of the box body 17, a coil type heat dissipation pipe 20 is arranged in the box body 17, two ends of the coil type heat dissipation pipe 20 are fixedly connected with the air inlet 18 and the air outlet 19 respectively, wave-shaped heat dissipation fins 21 are further arranged in the box body 17, the wave-shaped heat dissipation fins 21 are distributed around the coil type heat dissipation pipe 20, an air supply hole 22 is formed in the lower wall of the box body 17, and a bar-shaped air outlet 23 is formed in the upper wall of the box body 17.

Specifically, through making high-temperature gas flow through coil type cooling tube 20, increase area of contact, improve heat-sinking capability, arrange wave fin 21 around the cooling tube simultaneously, wave fin 21 absorbs the heat of cooling tube, further improve heat-sinking capability, and utilize wind scooper 12 to pass through the wind-feeding hole 22 with the wind that suction fan 11 produced in leading-in box 17, and flow out at bar air outlet 23, take away the heat on cooling tube and the fin, realize high-temperature gas's cooling, equipment structure is simple, the cooling effect is good.

In addition, the width of the strip-shaped air outlet 23 is 1 mm to 2 mm, so that smooth air outlet is ensured, impurities can be effectively prevented from entering the box body 17, and the service life of the air-cooling box type EGR cooler 7 is prolonged.

As shown in fig. 5, fig. 6 and fig. 8, the rear sides of the upper wall and the lower wall of the box 17 are oppositely provided with a fixing plate 24, the fixing plate 24 is provided with a threaded hole 25, the box 17 is fixed on a flywheel housing 26 of the diesel engine body 1 through the fixing plate 24 and the threaded hole 25 by bolts, the mounting structure is simple, the disassembly and the maintenance are convenient, the space is saved, and the mounting layout is optimized.

The utility model discloses a working process does: the diesel engine body starts, thereby the main shaft rotates and drives main shaft belt pulley and rotate simultaneously and drive fan belt pulley and rotate, the suction fan work, the wind that the suction fan produced leads to the lower extreme of air-cooled box EGR cooler through the wind scooper, get into the box through the supply-air hole, flow through coil pipe type cooling tube and wave fin after through bar air outlet discharge box, simultaneously exhaust partly high-temperature gas in the cylinder flows through exhaust manifold in proper order, EGR cooler intake pipe gets into in the air-cooled box EGR cooler, when high-temperature gas flows through coil pipe type cooling tube, the cooling tube absorbs its heat, and take away the heat through the wind of suction fan, make high-temperature gas cool, cooled gas gets into EGR cooler outlet duct, then mix the intake air in the cylinder again after intake manifold through the required waste gas volume of EGR valve control with the gas after with the booster and participate in burning.

Although an embodiment of the present invention has been described in detail, the description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. The utility model provides an air-cooled three jar diesel engine EGR system, includes the diesel engine body, the diesel engine body includes cylinder and booster, be connected with exhaust manifold and air intake manifold on the cylinder, its characterized in that: the exhaust manifold is characterized in that the outlet end of the exhaust manifold is connected with an air inlet pipe of the EGR cooler, the outlet end of the air inlet pipe of the EGR cooler is connected with an air inlet of the air cooling box type EGR cooler, the air outlet of the air cooling box type EGR cooler is connected with an air outlet pipe of the EGR cooler, the air outlet pipe of the EGR cooler is connected with the air inlet manifold through an EGR valve, the outlet end of the supercharger is communicated with the air inlet manifold through a supercharger air outlet pipe, and a cold air supply device is arranged at the lower end of the air cooling box type EGR cooler.

2. The EGR system of an air-cooled three-cylinder diesel engine of claim 1, wherein: the cold air supply device comprises an exhaust fan fixedly arranged on the diesel engine body, an air guide cover is fixedly arranged at the air outlet end of the exhaust fan, and the free end of the air guide cover extends to the lower end of the air cooling box type EGR cooler and is in contact connection with the side wall of the air cooling box type EGR cooler through a wind shield.

3. The EGR system of an air-cooled three-cylinder diesel engine of claim 2, wherein: the exhaust fan is characterized in that a driving mechanism is arranged on the exhaust fan, the driving mechanism comprises a main shaft belt pulley fixedly connected with a main shaft of the diesel engine body, and the main shaft belt pulley is in belt transmission connection with a fan belt pulley on the exhaust fan through a tension pulley.

4. The EGR system of an air-cooled three-cylinder diesel engine of claim 1, wherein: the box EGR cooler of forced air cooling includes the box, the rear side of box sets up for the opening, set up air inlet and gas outlet on the antetheca of box, be provided with coil pipe type cooling tube in the box, the both ends of coil pipe type cooling tube respectively with air inlet and gas outlet fixed connection, still be provided with the wave fin in the box, the wave fin distributes around coil pipe type cooling tube, be provided with the supply-air outlet on the lower wall of box, be provided with the bar exhaust vent on the upper wall of box.

5. The EGR system of an air-cooled three-cylinder diesel engine of claim 4, wherein: the rear sides of the upper wall and the lower wall of the box body are oppositely provided with fixing plates, threaded holes are formed in the fixing plates, and the box body is fixed to a flywheel shell of the diesel engine body through the fixing plates and the threaded holes through bolts.