An improved exhaust gas recirculation device and process for marine diesel engines

Abstract

The present invention relates to an improved exhaust gas recirculation device and process for marine diesel engines. The recirculation device includes an intake pipe arranged in sequence, a hollow disc communicated with the intake pipe, a rotating shaft arranged at the axis of the hollow disc, two or more windshields arranged on the rotating shaft and equidistantly arranged in the circumferential direction of the rotating shaft, a wind collecting hood arranged on the disc for collecting exhaust gas, two or more heat dissipation pipes arranged on the wind collecting hood for heat exchange with the outside air, a wind collecting cylinder arranged on the heat dissipation pipe, and an exhaust pipe communicated with the wind collecting cylinder. A through hole for gas flow is arranged on one side of the hollow disc close to the wind collecting hood, and the wind collecting hood is connected with the rotating shaft. The present invention introduces the exhaust gas of the diesel engine into the intake pipeline of the diesel engine, uses the heat energy in the exhaust gas to conduct heat exchange on the inhaled air, improves the temperature of the inhaled air, and enables the diesel engine to still ensure a high working efficiency in the cold winter.

Description

Technical Field

[0001] The present invention belongs to the technical field of diesel engine exhaust gas recirculation, and particularly relates to an improved exhaust gas recirculation device and process for marine diesel engines. Background Art

[0002] A diesel engine is an engine that burns diesel to obtain energy release. When a diesel engine operates, it needs to inhale air to assist in the combustion of fuel. In cold winters, the temperature of the gas inhaled by the diesel engine is relatively low. The intake air temperature directly affects the mixing quality of the fuel mist and air as well as the combustion temperature. Too low an intake air temperature will result in a low combustion temperature, reducing the thermal efficiency of the engine. If the same amount of work is to be obtained, more fuel needs to be injected, thus reducing the operating efficiency of the diesel engine. Summary of the Invention

[0003] The purpose of the present invention is to provide an improved exhaust gas recirculation device and process for marine diesel engines to solve the problems raised in the above background art.

[0004] The present invention achieves the above purpose through the following technical solutions:

[0005] An improved exhaust gas recirculation device for a marine diesel engine includes an intake pipe arranged in sequence, a hollow disc communicated with the intake pipe, a rotating shaft arranged at the axis of the hollow disc, two or more wind deflectors arranged on the rotating shaft and equally spaced in the circumferential direction of the rotating shaft, a wind collecting cover arranged on the disc for collecting exhaust gas, two or more heat dissipation pipes arranged on the wind collecting cover for heat exchange with the outside air, a wind collecting cylinder arranged on the heat dissipation pipes, and an exhaust pipe communicated with the wind collecting cylinder. A through hole for gas flow is provided on one side of the hollow disc close to the wind collecting cover, and the wind collecting cover is connected to the rotating shaft.

[0006] Preferably, the heat dissipation pipes are spiral, and the cross-section of the heat dissipation pipes is flat.

[0007] Preferably, a heat storage ring is provided on the hollow disc, a heat preservation mechanism for heat preservation of the heat storage ring is provided on the heat storage ring, and two or more friction rods for generating heat by friction and contacting the heat storage ring are provided on the wind collecting cover.

[0008] Preferably, the heat preservation mechanism includes a fixed heat preservation plate arranged on the outer circle of the heat storage ring and two or more movable heat preservation plates arranged on the side wall of the heat storage ring. The fixed heat preservation plate is connected to the wind collecting cover, a return spring is arranged between the movable heat preservation plate and the fixed heat preservation plate, and the two or more movable heat preservation plates form a complete ring.

[0009] Preferably, the cross-section of the movable heat preservation plate is a trapezoidal structure.

[0010] A process for improving exhaust gas recirculation of a marine diesel engine using any one of the above-mentioned improved exhaust gas recirculation devices for marine diesel engines includes the following steps:

[0011] S1: Introduce the exhaust gas discharged from the diesel engine into the hollow disk through the intake pipe. After the exhaust gas enters the hollow disk, it drives the windshield to rotate, and when it rotates to the through-hole in the hollow disk, it enters the air collecting hood.

[0012] S2: The exhaust gas entering the air collecting hood successively enters each heat dissipation pipe, causing the temperature of the heat dissipation pipe to rise. The heat dissipation pipes are arranged in the intake pipe of the diesel engine, and the air inhaled by the diesel engine exchanges heat with the heat dissipation pipes when passing through them.

[0013] S3: The exhaust gas passing through the heat dissipation pipes enters the air collecting cylinder and is discharged into the air from the air outlet pipe, completing the cycle process of the exhaust gas.

[0014] The beneficial effects of the present invention are as follows:

[0015] The present invention introduces the exhaust gas of the diesel engine into the intake pipe of the diesel engine, uses the heat energy in the exhaust gas to exchange heat with the inhaled air, increases the temperature of the inhaled air, and enables the diesel engine to still ensure a high working efficiency in the cold winter. Description of the Drawings

[0016] Figure 1 is the overall structural schematic diagram of the present invention;

[0017] Figure 2 is Figure 1 the schematic diagram in the A-A direction of

[0018] Figure 3 is Figure 1 the enlarged schematic diagram at B in

[0019] Figure 4 is the schematic diagram of the positional relationship between the friction rod and the movable heat preservation plate in the present invention;

[0020] Figure 5 is the schematic diagram of the positional relationship between the movable heat preservation plate and the heat storage ring in the present invention.

[0021] In the figure: 1. Intake pipe; 2. Hollow disk; 3. Windshield; 4. Air collecting hood; 5. Heat dissipation pipe; 6. Air collecting cylinder; 7. Air outlet pipe; 8. Through-hole; 9. Rotating shaft; 10. Heat storage ring; 11. Friction rod; 12. Fixed heat preservation plate; 13. Movable heat preservation plate; 14. Return spring. Detailed Embodiment

[0022] The following is a more detailed description of the present application. It is necessary to point out here that the following specific embodiments are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0023] Example 1

[0024] As shown Figures 1-5 in the figure, an improved exhaust gas recirculation device for a marine diesel engine includes an intake pipe 1 arranged in sequence, a hollow disc 2 communicated with the intake pipe 1, a rotating shaft 9 arranged at the axis of the hollow disc 2, two or more windshields 3 arranged on the rotating shaft 9 and equidistantly arranged in the circumferential direction of the rotating shaft 9, a wind collecting cover 4 arranged on the disc for collecting exhaust gas, two or more heat dissipation pipes 5 arranged on the wind collecting cover 4 for heat exchange with the outside air, a wind collecting cylinder 6 arranged on the heat dissipation pipe 5, and an exhaust pipe 7 communicated with the wind collecting cylinder 6. A through hole 8 for gas flow is arranged on one side of the hollow disc 2 close to the wind collecting cover 4, and the wind collecting cover 4 is connected with the rotating shaft 9.

[0025] As a further scheme of the present invention, the heat dissipation pipe 5 is spiral, and the cross section of the heat dissipation pipe 5 is flat.

[0026] In the above embodiment, a large amount of exhaust gas will be discharged during the operation of the diesel engine. The exhaust gas has a certain amount of heat energy. The exhaust gas is introduced into the hollow disc 2 through the intake pipe 1. When the exhaust gas moves, it contacts the windshield 3, causing the windshield 3 to rotate, thereby driving the wind collecting cover 4 and the heat dissipation pipe 5 to rotate. When the exhaust gas rotates to the through hole 8 in the hollow disc 2, it enters the wind collecting cover 4 and is divided into multiple parts and enters the heat dissipation pipe 5. After the exhaust gas enters the heat dissipation pipe 5, the temperature of the heat dissipation pipe 5 rises. When the heat dissipation pipe 5 contacts the air, it can heat the air, thereby increasing the temperature of the air entering the diesel engine. After passing through the heat dissipation pipe 5, the exhaust gas enters the wind collecting cylinder 6 and is finally discharged through the exhaust pipe 7, completing the entire recovery cycle process of the exhaust gas.

[0027] Among them, the spiral shape of the heat dissipation pipe 5 not only increases the contact length between the heat dissipation pipe 5 and the air, enables the air to be fully heated, and further improves the recovery efficiency of heat energy. During the rotation of the multiple heat dissipation pipes 5, a spiral conveying effect can be generated, causing the air in the contact area with the heat dissipation pipe 5 to be driven in the reverse direction, thereby further increasing the contact time between the air and the heat dissipation pipe 5, and also improving the diffusion of the air in the intake pipe 1, making the hot air and the cold air mix evenly, which can not only ensure the stability of the diesel engine operation, but also make the air hotter and colder more evenly.

[0028] As a further scheme of the present invention, a heat storage ring 10 is arranged on the hollow disc 2, a heat preservation mechanism for heat preservation of the heat storage ring 10 is arranged on the heat storage ring 10, and two or more friction rods 11 in contact with the heat storage ring 10 and used for generating heat by friction are arranged on the wind collecting cover 4.

[0029] As a further solution of the present invention, the heat preservation mechanism includes a fixed heat preservation plate 12 arranged on the outer ring of the heat storage ring 10 and more than two movable heat preservation plates 13 arranged on the side wall of the heat storage ring 10. The fixed heat preservation plate 12 is connected to the air collecting hood 4. A return spring 14 is arranged between the movable heat preservation plate 13 and the fixed heat preservation plate 12. More than two of the movable heat preservation plates 13 form a complete ring.

[0030] As a further solution of the present invention, the cross section of the movable heat preservation plate 13 is a trapezoidal structure.

[0031] In the above embodiment, when the air collecting hood 4 rotates, it drives the friction rod 11 to rotate. When the friction rod 11 moves on the heat storage ring 10, heat is generated by friction, so that the temperature of the heat storage ring 10 rises, and the air entering the diesel engine is reheated. After the diesel engine stops working, the air collecting hood 4 stops rotating, and the heat preservation mechanism can keep the heat storage ring 10 warm, so that the heat storage ring 10 can reheat the air after the diesel engine is restarted.

[0032] Among them, the movable heat preservation plate 13 in the heat preservation mechanism opens when rotating, exposing the heat storage ring 10, so that the friction rod 11 can normally move on the surface of the heat storage ring 10 and generate heat energy. After the movable heat preservation plate 13 stops rotating, the return spring 14 drives the movable heat preservation plate 13 to stick to the surface of the heat storage ring 10, preventing heat dissipation. In winter, due to the low air temperature, it is particularly difficult to start the diesel engine. When the diesel engine starts, air enters the diesel engine, and the flow of air and the flow of diesel engine exhaust gas drive the heat dissipation pipe 5 and the movable heat preservation plate 13 to rotate. When the movable heat preservation plate 13 rotates, it separates from the heat storage ring 10, so that the heat storage ring 10 can heat the air entering the diesel engine, thereby increasing the starting success rate of the diesel engine.

[0033] The cross section of the movable heat preservation plate 13 being a trapezoidal structure enables the movable heat preservation plate 13 to easily separate from the heat storage ring 10 when rotating, avoiding the situation where the movable heat preservation plate 13 cannot be separated.

[0034] A process for improving the exhaust gas circulation of a marine diesel engine by using the improved exhaust gas circulation device for marine diesel engines described in any one of the above, includes the following steps:

[0035] S1: Introduce the exhaust gas discharged from the diesel engine into the hollow disc 2 through the intake pipe 1. After the exhaust gas enters the hollow disc 2, it drives the wind deflector 3 to rotate, and when it rotates to the through hole 8 in the hollow disc 2, it enters the air collecting hood 4;

[0036] S2: The exhaust gas entering the air collecting hood 4 sequentially enters each heat dissipation pipe 5, so that the temperature of the heat dissipation pipe 5 rises. The heat dissipation pipe 5 is arranged in the intake pipe 1 of the diesel engine, and the air inhaled by the diesel engine exchanges heat with the heat dissipation pipe 5 when passing through the heat dissipation pipe 5;

[0037] S3: The waste gas passing through the heat dissipation pipe 5 enters the air collection cylinder 6 and is discharged into the air from the air outlet pipe 7, completing the cycle process of the waste gas.

[0038] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An improved exhaust gas recirculation device for marine diesel engines, characterized in that: It includes an intake pipe (1) arranged in sequence, a hollow disc (2) communicated with the intake pipe (1), a rotating shaft (9) arranged at the axis of the hollow disc (2), two or more windshields (3) arranged on the rotating shaft (9) and equidistantly arranged in the circumferential direction of the rotating shaft (9), a wind collecting hood (4) arranged on the disc for collecting exhaust gas, two or more heat dissipation pipes (5) arranged on the wind collecting hood (4) for heat exchange with the outside air, a wind collecting cylinder (6) arranged on the heat dissipation pipe (5), and an exhaust pipe (7) communicated with the wind collecting cylinder (6). A through hole (8) for gas flow is arranged on one side of the hollow disc (2) close to the wind collecting hood (4), and the wind collecting hood (4) is connected with the rotating shaft (9); A heat storage ring (10) is arranged on the hollow disc (2), a heat preservation mechanism for heat preservation of the heat storage ring (10) is arranged on the heat storage ring (10), and two or more friction rods (11) which are in contact with the heat storage ring (10) and used for generating heat by friction are arranged on the wind collecting hood (4); The heat preservation mechanism includes a fixed heat preservation plate (12) arranged on the outer ring of the heat storage ring (10) and two or more movable heat preservation plates (13) arranged on the side wall of the heat storage ring (10). The fixed heat preservation plate (12) is connected with the wind collecting hood (4), a return spring (14) is arranged between the movable heat preservation plate (13) and the fixed heat preservation plate (12), and the two or more movable heat preservation plates (13) form a complete ring shape.

2. The improved exhaust gas recirculation device for a marine diesel engine according to claim 1, characterized in that: The heat dissipation pipe (5) is spiral, and the cross section of the heat dissipation pipe (5) is flat.

3. An improved exhaust gas recirculation device for a marine diesel engine according to claim 1, characterized in that: The cross section of the movable heat preservation plate (13) is in a trapezoidal structure.

4. A process for improving the exhaust gas recirculation of a marine diesel engine by using the improved exhaust gas recirculation device of the marine diesel engine according to any one of claims 1-3, characterized in that, It includes the following steps: S1: Introduce the exhaust gas discharged from the diesel engine into the hollow disc (2) through the intake pipe (1). After the exhaust gas enters the hollow disc (2), it drives the windshield (3) to rotate, and when it rotates to the through hole (8) in the hollow disc (2), it enters the wind collecting hood (4); S2: The exhaust gas entering the wind collecting hood (4) sequentially enters each heat dissipation pipe (5), so that the temperature of the heat dissipation pipe (5) rises. The heat dissipation pipe (5) is arranged in the intake pipe (1) of the diesel engine, and the air inhaled by the diesel engine exchanges heat with the heat dissipation pipe (5) when passing through the heat dissipation pipe (5); S3: The exhaust gas passing through the heat dissipation pipe (5) enters the wind collecting cylinder (6) and is discharged into the air from the exhaust pipe (7), completing the cycle process of the exhaust gas.

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