CN210068275U - Diesel oxidation type catalytic converter - Google Patents

Abstract

The utility model discloses a diesel oxidation type catalytic converter, including the converter casing, air inlet and gas vent have been seted up respectively to converter casing both ends, the inside oxidation catalyst converter carrier that is provided with of converter casing, oxidation catalyst converter carrier surface is provided with the expansion gasket, inside oxygen supply unit and the oxygen sensor of being provided with between oxidation catalyst converter carrier and the air inlet of being located of converter casing, oxygen supply unit includes the coil pipe, coil pipe one end through connection has the discharge, a plurality of gas pocket has been seted up on the discharge surface, the coil pipe other end runs through the converter casing internal roof and extends to the external connection and has the intake pipe, be provided with the solenoid valve between the intake pipe both ends and admit air the pump. The utility model discloses a be equipped with coil pipe and discharge, be favorable to making the air in the coil pipe heat through tail gas, it is great to reduce the air and the tail gas difference in temperature that get into, influences the catalyst reaction in the oxidation catalysis carrier.

Description

Diesel oxidation type catalytic converter

Technical Field

The utility model relates to a diesel engine tail gas clean-up equipment technical field, in particular to diesel engine oxidation type catalytic converter.

Background

An oxidation-type catalytic converter (DOC), which is a device installed in an engine exhaust line to convert carbon monoxide (CO) and Hydrocarbons (HC) in engine exhaust into harmless water (H20) and carbon dioxide (CO2) by oxidation reaction. It is an early product in catalytic converter technology. The structure form is basically the same as that of the three-way catalytic converter, and the catalyst coating is different and only has oxidation capacity and no reduction capacity.

However, the oxidation-type catalytic converter generally requires a secondary air injection device to cooperate with the oxidation-type catalytic converter to supply oxygen required for oxidation reaction for reducing the emission of carbon monoxide (CO) and Hydrocarbons (HC) in the exhaust gas, but when external air enters the converter, the temperature of the oxidation catalyst is easily reduced due to a temperature difference problem, thereby affecting the oxidation catalytic efficiency.

Therefore, it is necessary to invent a diesel oxidation type catalytic converter to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a diesel oxidation type catalytic converter, through being equipped with coil pipe and discharge, be favorable to making the air in the coil pipe heat through tail gas, it is great with the tail gas difference in temperature to reduce the air that gets into, influences the catalyst reaction in the oxidation catalysis carrier to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a diesel oxidation type catalytic converter, includes the converter casing, air inlet and gas vent have been seted up respectively to converter casing both ends, the inside oxidation catalyst converter carrier that is provided with of converter casing, oxidation catalyst converter carrier surface is provided with the expansion pad piece, inside being located of converter casing is provided with oxygen supply unit and oxygen sensor between oxidation catalyst converter carrier and the air inlet, oxygen supply unit includes the coil pipe, coil pipe one end through connection has the discharge, a plurality of gas pocket has been seted up on the discharge surface, the coil pipe other end runs through converter casing internal roof and extends to the external connection and have the intake pipe, intake pipe one end is connected with the suction head, be provided with the solenoid valve between the intake pipe both ends and admit air the pump.

Preferably, the top of the converter shell is provided with a protective box at the position of the air inlet pipe, one end of the protective box is provided with an opening, the protective box is provided with filter cotton at the position of the opening, and the protective box is internally provided with a heating resistor.

Preferably, the coil is made of a heat-conducting aluminum material, a particle filter is arranged between the coil and the oxygen sensor, and the particle filter adopts regenerative PM particle filtration.

Preferably, the air holes in the air collecting pipe are formed in one side, the front side and the rear side of the air holes close to the oxidation catalyst carrier, and the air holes are formed between the inside and the outside of the air collecting pipe in a horn shape.

Preferably, a fixing buckle is connected between the bent arc position of the top and the bottom of the coil pipe and the converter shell, the fixing buckle is in a U-shaped arrangement, and the fixing buckle and the converter shell and the penetration position of the coil pipe and the converter shell are connected through a seamless welding process.

Preferably, the electromagnetic valve, the air inlet pump, the oxygen sensor and the heating resistor are all electrically connected with a self control system of the automobile, and the electromagnetic valve is arranged as a one-way valve.

The utility model discloses a technological effect and advantage:

1. through being equipped with coil pipe and discharge, be favorable to making the air in the coil pipe heat through tail gas, it is great to reduce the air and the tail gas difference in temperature that get into, influences the catalyst reaction in the oxidation catalysis carrier, through the horn mouth setting of gas pocket, makes the even injection of air inside the converter casing to make air and tail gas misce bene, prevent to influence oxygen sensor's detection accuracy.

2. Through being equipped with heating resistor, be favorable to making the inside air of entering intake pipe heat in advance, process the coil pipe once more and to tail gas reverse heating to make the air after the mixture accord with oxidation catalysis's reaction temperature with the tail gas temperature, improve the purifying effect to tail gas.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a cross-sectional view of the gas collecting tube structure of the present invention;

fig. 3 is a system diagram of the overall structure of the present invention.

In the figure: 1. a converter housing; 2. an air inlet; 3. an exhaust port; 4. an oxidation catalyst support; 5. an expansion gasket; 6. an oxygen supply device; 7. an oxygen sensor; 8. a coil pipe; 9. a gas collecting pipe; 10. air holes; 11. an air inlet pipe; 12. a suction head; 13. an electromagnetic valve; 14. an intake pump; 15. a protective box; 16. filtering cotton; 17. a heating resistor; 18. a particulate filter; 19. and (5) fixing the buckle.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a diesel oxidation catalytic converter as shown in figures 1-3, which comprises a converter shell 1, wherein both ends of the converter shell 1 are respectively provided with an air inlet 2 and an air outlet 3, an oxidation catalyst carrier 4 is arranged inside the converter shell 1, the surface of the oxidation catalyst carrier 4 is provided with an expansion gasket 5, an oxygen supply device 6 and an oxygen sensor 7 are arranged inside the converter shell 1 and between the oxidation catalyst carrier 4 and the air inlet 2, the oxygen supply device 6 comprises a coil 8, one end of the coil 8 is connected with a gas collecting pipe 9 in a through way, the surface of the gas collecting pipe 9 is provided with a plurality of air holes 10, the other end of the coil 8 penetrates through the inner top wall of the converter shell 1 and extends to the outside to be connected with an air inlet pipe 11, one end of the air inlet pipe 11 is connected with a suction head 12, a solenoid valve 13 and an air inlet pump 14 are, through being equipped with coil pipe 8 and discharge 9, be favorable to making the air in the coil pipe 8 heat through tail gas, it is great to reduce the air that gets into and the tail gas difference in temperature, influences the catalyst reaction in the oxidation catalysis carrier.

Further, in the above technical solution, a protection box 15 is disposed at the top of the converter housing 1 at the position of the air inlet pipe 11, one end of the protection box 15 is provided with an opening, the protection box 15 is provided with filter cotton 16 at the position of the opening, the filter cotton 16 is disposed in the protection box 15, so as to facilitate filtering of air entering the converter housing 1, a heating resistor 17 is disposed in the protection box 15, and the heating resistor 17 is disposed in the protection box 15, so as to facilitate heating of air entering the air inlet pipe 11 in advance, so that the temperature of the mixed air and the temperature of the tail gas meet the reaction temperature of oxidation catalysis, and the purification effect of the tail gas is improved;

further, in the above technical solution, the coil 8 is made of a heat conducting aluminum material, a particle filter 18 is disposed between the coil 8 and the oxygen sensor 7, the particle filter 18 is filtered by using regenerative PM particles, and the particle filter 18 is disposed, so as to facilitate filtering of particles in the exhaust gas and increase the service life of the converter;

further, in the above technical solution, the air holes 10 on the air collecting pipe 9 are located at one side and the front and rear sides close to the oxidation catalyst carrier 4, the air holes 10 are located between the inside and the outside of the air collecting pipe 9 and are arranged in a bell mouth shape, and the air is uniformly sprayed through the inside of the converter housing 1 through the bell mouth arrangement of the air holes 10, so that the air and the tail gas are uniformly mixed, and the detection accuracy of the oxygen sensor 7 is prevented from being influenced;

further, in the above technical solution, a fixing buckle 19 is connected between the bent arc positions of the top and the bottom of the coil 8 and the converter shell 1, and the fixing buckle 19 is provided to facilitate preventing the coil 8 from loosening, the fixing buckle 19 is in a U-shaped configuration, and the fixing buckle 19 and the converter shell 1 and the coil 8 and the converter shell 1 are connected by a seamless welding process;

further, in the above technical solution, the electromagnetic valve 13, the intake pump 14, the oxygen sensor 7 and the heating resistor 17 are all electrically connected to a self-control system of the automobile, and the electromagnetic valve 13 is a one-way valve.

This practical theory of operation:

referring to the attached drawings 1-3 of the specification, when the device is used, tail gas enters the converter shell 1 through the air inlet 2, the oxygen content carried in the tail gas is detected through the oxygen sensor 7, when the oxygen content is low, the air inlet pump 14 and the electromagnetic valve 13 are controlled to work through the control system carried by an automobile, external air is sent into the coil 8 through the suction port and the air inlet pipe 11, the tail gas passing through the coil 8 is washed by the tail gas, the tail gas passing through the coil 8 is heated, the temperature difference between the entering air and the tail gas is large, the catalyst reaction in an oxidation catalyst carrier is influenced, when the air enters the air collecting pipe 9, the air is uniformly sprayed through the converter shell 1 through the horn mouth of the air hole 10, so that the air and the tail gas are uniformly mixed, the detection accuracy of the oxygen sensor 7 is prevented from being influenced, and when the temperature is low, the heating resistor 17 can be controlled to, make the inside air that gets into intake pipe 11 heat in advance, pass through coil pipe 8 once more and to tail gas reverse heating to make the air after the mixture accord with oxidation catalysis's reaction temperature with the tail gas temperature, improve the purifying effect to tail gas.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims (6)

1. A diesel oxidation catalytic converter comprising a converter housing (1), characterized in that: both ends of the converter shell (1) are respectively provided with an air inlet (2) and an air outlet (3), an oxidation catalyst carrier (4) is arranged in the converter shell (1), an expansion gasket (5) is arranged on the surface of the oxidation catalyst carrier (4), an oxygen supply device (6) and an oxygen sensor (7) are arranged between the oxidation catalyst carrier (4) and the air inlet (2) in the converter shell (1), the oxygen supply device (6) comprises a coil pipe (8), one end of the coil pipe (8) is connected with a gas collecting pipe (9) in a run-through way, a plurality of air holes (10) are arranged on the surface of the gas collecting pipe (9), the other end of the coil pipe (8) penetrates through the inner top wall of the converter shell (1) and extends to the outside to be connected with an air inlet pipe (11), one end of the air inlet pipe (11) is connected with a suction head (12), and an electromagnetic valve (13) and an air inlet pump (14) are arranged between the two ends of the air inlet pipe (11).

2. A diesel oxidation catalytic converter as set forth in claim 1, characterized in that: converter casing (1) top is located intake pipe (11) position and is provided with protective housing (15), protective housing (15) one end sets up for the opening, protective housing (15) are located the opening position and are provided with filter pulp (16), protective housing (15) inside is provided with heating resistor (17).

3. A diesel oxidation catalytic converter as set forth in claim 1, characterized in that: the coil pipe (8) is made of a heat-conducting aluminum material, a particle filter (18) is arranged between the coil pipe (8) and the oxygen sensor (7), and the particle filter (18) adopts regenerative PM particle filtration.

4. A diesel oxidation catalytic converter as set forth in claim 1, characterized in that: the gas holes (10) on the gas collecting pipe (9) are formed in one side, the front side and the rear side of the gas holes close to the oxidation catalyst carrier (4), and the gas holes (10) are formed between the inside and the outside of the gas collecting pipe (9) in a horn mouth shape.

5. A diesel oxidation catalytic converter as set forth in claim 1, characterized in that: be connected with between the bended-arc position of coil pipe (8) top and bottom and converter casing (1) and fix and detain (19), fixed knot (19) set up for the U-shaped, it all adopts seamless welding process to be connected with coil pipe (8) and converter casing (1) through position between fixed knot (19) and converter casing (1).

6. A diesel oxidation catalytic converter as set forth in claim 1, characterized in that: the electromagnetic valve (13), the air inlet pump (14), the oxygen sensor (7) and the heating resistor (17) are all electrically connected with a self control system of the automobile, and the electromagnetic valve (13) is arranged as a one-way valve.

Images