CN202500678U

CN202500678U - EGR air inlet structure

Info

Publication number: CN202500678U
Application number: CN2012200168776U
Authority: CN
Inventors: 盛丽莉
Original assignee: SAIC Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2012-01-16
Filing date: 2012-01-16
Publication date: 2012-10-24
Anticipated expiration: 2022-01-16

Abstract

The utility model discloses an EGR air inlet structure, comprising an inlet manifold, and an upper branch pipe and a lower branch pipe extending from the inlet manifold. The upper branch pipe comprises an inner pipe communicated with the inlet manifold and an outer pipe communicated with a tail pipe, the airway of the air inlet unit connected with the upper branch pipe is connected with the inner pipe by butt joint, and a gap exists between the airway and the inner pipe. According to the EGR air inlet structure provided in the utility model, the structure is simple, mounting and dismounting are convenient, the manufacture cost is low, tail gas can be uniform mixed with air, and the EGR rate is raised.

Description

A kind of EGR air intake structure

Technical field

The utility model relates to the technical field of engine intake and exhaust system, a kind of diesel engine EGR Air mixing device of saying so more specifically.

Background technique

Needs along with raising that engine performance is required and response environment variation; China has implemented more strict emission control standards; The EGR technology is widely applied to engine art; EGR is that the technology that the air inlet side is burnt it is once again isolated and imported to exhaust gas recirculatioon (ExhaustGas Recirculation) will be discharged gas for automobile with compact internal combustion engine after burning a part; It has effectively utilized on the one hand in the engine discharging tail gas can utilize fuel owing to air with the residue oil gas that fuel mix is inhomogeneous, the inadequate reason of burning forms, carbon granules etc. again, continues to bring into play its residual activity; Be that the part tail gas that from outlet pipe, absorbs does not almost have oxygen content on the other hand; After air mixing; (air of emission-free mixing) reduced the concentration of oxygen in the mixed gas relatively; Maximum temperature during burning in the firing chamber also decreases, thereby has suppressed the formation of harmful gases such as oxynitrides, reduces discharging.But at present the EGR common scheme generally has at following 2 and is difficult for realizing: ER EGR Rate is not high, waste gas and fresh air are difficult for mixing.

The model utility content

The utility model technical problem to be solved is to realize a kind ofly can tail gas in the outlet pipe being drawn and fully being mixed the EGR air intake structure with air.

To achieve these goals; The technological scheme that the utility model adopts is: a kind of EGR air intake structure is provided with the intake manifold and by extended arm and the lower branch line gone up of intake manifold's one end; The described arm of going up comprises the interior pipe that is communicated with the intake manifold; And the outer tube that is communicated with offgas duct, and the air flue of the air inlet unit that is connected with last arm and interior pipe connect and have the gap between the two.

Described intake manifold and last arm, lower branch line cross section are F shape.

The end caliber reduces the interior pipe of described upward arm gradually towards the air outlet, and the end caliber increases outer tube gradually towards the air outlet.

Described gap is 4mm.

The advantage of the utility model is that this air intake structure is simple in structure, installation and removal easily, and low cost of manufacture can make tail gas mix fully with even air, improves the effect that EGR leads.

Description of drawings

Face the content of every width of cloth accompanying drawing expression in the utility model specification and the mark among the figure down and make brief description:

Fig. 1 is an EGR air intake structure schematic representation;

Fig. 2 is an EGR air intake structure sectional view;

Mark among the above-mentioned figure is: 1 intake manifold; 2, go up arm; 3, lower branch line; 4, offgas duct; 5, air inlet unit; 21, interior pipe; 22, outer tube; 23, inner chamber; 24, gap.

Embodiment

Can know that referring to Fig. 1,2 major component of EGR air intake structure is the eddy current control unit, comprise intake manifold 1; By extended arm 2 and the lower branch line 3 gone up of intake manifold's 1 one ends, offgas duct 4, intake manifold 1 and last arm 2, lower branch line 3 cross sections are F shape; Last arm 2 and lower branch line 3 air outlet flanged surfaces are on same plane, and wherein going up arm 2 is double-skin duct, and outer tube 22 is communicated with offgas duct 4; In pipe 21 is communicated with intake manifold 1, thereby interior pipe 21 and outer tube 22 are configured for storing the inner chamber 23 of tail gas, and on the interior pipe 21 of arm 2 the end caliber reduces gradually towards the air outlet; The end caliber increases outer tube 22 gradually towards the air outlet, forms a very big inner chamber 23, helps storing more tail gas; Last arm 2 is connected with air inlet unit 5 through bolt; The air flue of air inlet unit 5 and interior pipe 21 connect and have gap 24 between the two, promptly in pipe 21 certain distance is arranged, the preferred 4mm in this gap to last arm 2 flanged surfaces.

Deliver to inner chamber 23 from the part tail gas that outlet pipe is drawn through offgas duct 4, and be stored in wherein, during the work of EGR air intake structure; Respectively by last arm 2 and lower branch line 3, directly deliver to air in the cylinder as normal channel, last arm 2 air flow by lower branch line 3 by intake manifold's 1 input for air; Gap 24 can produce negative pressure, absorbs the tail gas in the inner chamber 23, and then inner chamber 23 internal air pressures are reduced; Exhaust gas flow direction low pressure area in the outlet pipe; Improved EGR and led, tail gas and air can be admixed together more uniformly simultaneously, and perfect combustion in pressure stabilizing cavity gets into cylinder.

Combine accompanying drawing that the present invention has been carried out exemplary description above; Obviously the concrete realization of the utility model does not receive the restriction of aforesaid way; As long as adopted the improvement of the various unsubstantialities that method of the present invention design and technological scheme carry out; Or design of the present invention and technological scheme are directly applied to other occasion without improving, all within the protection domain of the utility model.

Claims

1. EGR air intake structure; It is characterized in that: air intake structure is provided with intake manifold (1) and by extended arm (2) and the lower branch line (3) gone up of intake manifold's (1) one end; The described arm (2) of going up comprises the interior pipe (21) that is communicated with intake manifold (1); And the outer tube (22) that is communicated with offgas duct (4), and the air flue of the air inlet unit (5) that is connected with last arm (2) and interior pipe (21) connect and have gap (24) between the two.

2. EGR air intake structure according to claim 1 is characterized in that: described intake manifold (1) is F shape with last arm (2), lower branch line (3) cross section.

3. EGR air intake structure according to claim 1 is characterized in that: the end caliber reduces the interior pipe (21) of described upward arm (2) gradually towards the air outlet, and the end caliber increases outer tube (22) gradually towards the air outlet.

4. according to claim 1,2 or 3 described EGR air intake structures, it is characterized in that: described gap (24) are 4mm.