AUTOMATIC PURIFYING DEVICE FOR ENGINE EXHAUST GASES

Abstract

An automatic purifying device for engine exhaust gases is disclosed. Exhaust gases flow through a necked portion to be speeded and the temperature of the exhaust gases is kept uniform after entering an exhaust inlet, and the speeded exhaust gases then pass through a flared mouth so as to be diffused through metal catalyst carriers and a straight-through ceramic filter or wall-flow filter, allowing the poisonous emissions such as nitrogen oxides (NOx) to collide with the metal catalyst carriers to generate high heat to ignite carbon particles, carbon monoxide, hydrocarbons, and the like which are then decomposed and reduced to nitrogen gas and water by added urea or ammonia in the middle of passing through the straight-through ceramic filter or wall-flow filter, where the generated water can then be discharged through a drain port, thereby decreasing pollution to the environment.

Claims

1. An automatic purifying device for engine exhaust gases, comprising: an exhaust pipe, comprising an exhaust inlet and exhaust outlet positioned on two axial ends thereof and in communication with each other, a necked portion and flared mouth being configured in sequence between said exhaust inlet and exhaust outlet in an axial direction from said exhaust inlet toward said exhaust outlet, and said necked portion being smaller than said flared mouth in diameter; a plurality of metal catalyst carriers, arranged axially in sequence behind said flared mouth; and at least one straight-through ceramic filter, covered with ceramic wool and configured between said last arranged metal catalyst carrier and said exhaust outlet.

2. The device according to claim 1, wherein an air intake allowing an inside of said exhaust pipe to be in communication with an outside thereof is configured on a wall of said neck portion.

3. The device according to claim 1, wherein a drain port is configured on a wall of said exhaust pipe between one of said metal catalyst carriers and said straight-through ceramic filter, and a bolt adapted to close and open said drain port is configured on said drain port.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 is a cross-sectional view of a preferred embodiment of the present invention;

[0015] FIG. 2 is a perspective view of the embodiment of the present invention; and

[0016] FIG. 3 is a cross-sectional view of another preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Referring to FIGS. 1 and 2, an automatic purifying device for engine exhaust gases according to the present invention, in a preferred embodiment, includes an exhaust pipe 1 which further includes an exhaust inlet 11 and exhaust outlet 12 positioned on the two axial ends thereof and in communication with each other, where a necked portion 13 and flared mouth 14 are configured in sequence between the exhaust inlet 11 and exhaust outlet 12 in an axial direction from the exhaust inlet 11 toward the exhaust outlet 12, and the necked portion 1 is smaller than the flared mouth 12 in diameter. Furthermore, an air intake 10 adapted to communicate the inside of the exhaust pipe 1 with the outside thereof is configured on the wall of the necked portion 13.

[0018] Furthermore, a plurality of metal catalyst carriers 2 and at least one straight-through ceramic filter 3, which are arrange distantly in the exhaust pipe 1, are configured axially in sequence behind the flared mouth 14 of the exhaust pipe 1, where the metal catalyst carriers 2 are respectively coated with platinum and palladium-based oxidation catalyst, and the straight-through ceramic filter 2 is covered with a ceramic wool 31 and positioned between the last metal catalyst carrier 2 and exhaust outlet 12. Optionally, the straight-through ceramic filter 3 may also be replaced with a wall-flow filter (not shown in the figures), and the wall-flow filter is covered with the ceramic wool 31, which is used to soak and absorb urea water or ammonia water.

[0019] Furthermore, a drain port 15 may further be configured on the wall of the exhaust pipe 1 between one of the metal catalyst carriers 2 and the straight-through ceramic filter 3, and a bolt 16 adapted to close and open the drain port 15 is configured on the drain port 15.

[0020] After the exhaust pipe of the present invention is installed in a vehicle, exhaust gases, upon vehicle driving, flow through the necked portion 13 to be speeded and the temperature of the exhaust gases is kept uniform after entering the exhaust inlet 11, a negative pressure is formed inside the exhaust pipe 1 while the exhaust gases are speeded in the necked portion 13, and thereupon, air outside the exhaust pipe 1 is inhaled into the exhaust pipe 1 through the air intake 10 to mix with the exhaust gases, and the speeded exhaust gases mixed with air then pass through the flared mouth 15 so as to be diffused through the metal catalyst carriers 2 and straight-through ceramic filter 3 or wall-flow filter, allowing the poisonous emissions such as nitrogen oxides (NOx) to collide with the metal catalyst carriers 2 to generate high heat to ignite carbon particles, carbon monoxide, hydrocarbons, and the like which are decomposed and reduced to nitrogen gas and water by the added urea or ammonia in the middle of passing through the straight-through ceramic filter 3 or wall-flow filter, where the generated water can then be discharged through the drain port 15, thereby decreasing pollution to the environment.

[0021] FIG. 3 shows another preferred embodiment of an automatic purifying device for engine exhaust gases according to the present invention, the present embodiment basically has the same structures as the embodiment mentioned above, except there is no configuration of the air intake 10 on the exhaust pipe 1 in the present embodiment. Similarly, exhaust gases flow through the necked portion 13 to be speeded and the temperature of the exhaust gases is kept uniform after entering the exhaust inlet 11, and the speeded exhaust gases then pass through the flared mouth 15 so as to be diffused through the metal catalyst carriers 2 and straight-through ceramic filter 3 or wall-flow filter, allowing the poisonous emissions such as nitrogen oxides (NOx) to collide with the metal catalyst carriers 2 to generate high heat to ignite carbon particles, carbon monoxide, hydrocarbons, and the like which are then decomposed and reduced to nitrogen gas and water by the added urea or ammonia in the middle of passing through the straight-through ceramic filter 3 or wall-flow filter, where the generated water can then be discharged through the drain port 15, thereby decreasing pollution to the environment.