CN200985818Y - Ternary catalyst convertor - Google Patents

Abstract

A three-way catalytic converter, comprising a housing, a front end cover connected to the air pipe, and a rear end cover connected to the air pipe, the front end cover and the rear end cover are respectively connected to the two ends of the housing, and the housing is provided with There are catalyst carriers, wherein there are at least two catalyst carriers arranged inside the casing; the catalyst carriers are arranged within a distance of 80 cm from the exhaust gas flow of the engine to the catalyst carriers. The catalyst carrier is arranged in sequence along the flow direction of the exhaust gas of the engine. Isolation parts are also provided between the catalyst carriers in the casing, and retaining rings are respectively arranged on the outsides of the outermost two catalyst carriers provided with at least two catalyst carriers in the casing away from the partition parts. The utility model has the following characteristics: the structure is simple, the manufacturing cost is low, the structure arrangement of the two-stage catalytic converter is not required, and the method of electric heating is not required, so that the effective catalytic purification effect on the automobile exhaust can be realized.

Description

Three-way catalytic converter

technical field

The utility model relates to the field of transportation, in particular to a three-way catalytic converter used for purifying exhaust gas of automobile engines.

Background technique

With the gradual improvement of people's awareness of environmental protection, the purification of automobile exhaust has become a major issue that people cannot ignore.

In order to meet the exhaust emission standards, current mid-level cars are usually equipped with three-way catalytic converters. A three-way catalytic converter is the most common external purification device on an automobile. The three-way catalytic converter includes a front cover, a rear end cover, a housing and a catalyst carrier. Catalyst, also known as catalyst, is a substance that can promote chemical reactions of other substances without changing its shape and quality. It usually uses three noble metals, Rh, Pt or Pd, so it is called "ternary". The carrier material of the catalyst is mainly honeycomb ceramics. The noble metals react with the harmful gases CO, HC and NO _X respectively to produce harmless CO ₂ , H ₂ O and N ₂ . However, the three-way catalytic converter generally starts to catalyze harmful substances in automobile exhaust when the operating temperature is above 250°C, and the ideal operating temperature range for high conversion rate and long life is 400°C-800°C. Therefore, in the initial stage of starting the car, or idling for a long time, because the light-off temperature of the catalyst cannot be reached, the catalyst basically does not work, and cannot play the role of catalyzing harmful substances. At present, in order to solve the above problems, there are generally two solutions: one is to add a pre-catalytic converter at the exhaust outlet of the engine gas, and set a catalytic converter next to the auxiliary muffler, which is commonly referred to as The layout structure of the two-stage catalytic converter can make the exhaust gas finally discharged into the atmosphere meet the relevant emission standards through the catalytic purification of two separate catalytic converters, but this will greatly increase the manufacturing cost; The preheating of the catalytic converter usually uses electric heating method. Since the air and the catalyst carrier are poor conductors of heat, the work efficiency is extremely low and the purpose of rapid heating cannot be achieved. For this reason, it is necessary to design a new type of three-way catalytic converter, which can effectively catalyze and purify automobile exhaust without using a two-stage catalytic structural arrangement, and also does not need electric heating. National standards.

Contents of the invention

The purpose of this utility model is to solve the above problems, to provide a simple structure, low manufacturing cost, no need to adopt the structural arrangement of two-stage catalytic converters, and no need to use electric heating method, it can realize the protection of automobile engine exhaust. A three-way catalytic converter that effectively catalyzes purification.

The solution of the utility model to achieve the above purpose is: a three-way catalytic converter, including a housing, a front end cover connected to the air pipe, and a rear end cover connected to the air pipe. The front end cover and the rear end cover are respectively connected to the housing The two ends of the housing are provided with a catalyst carrier, which is characterized in that: there are at least two catalyst carriers inside the housing; within the distance.

As a further improvement, the catalyst carrier is arranged in sequence along the flow direction of the engine exhaust.

As a further improvement, an isolation part is further provided between the respective catalyst carriers of the housing.

As a further improvement, a vibration-damping layer is further arranged between the carrier and the casing.

As a further improvement, retaining rings are respectively provided on the outer sides of the outermost two catalyst carriers provided with at least two catalyst carriers in the housing and away from the recess.

As a further improvement, the catalyst carrier is a honeycomb ceramic carrier.

The utility model has the advantages of: 1) The three-way catalytic converter for vehicles provided by the utility model has two catalyst carriers arranged in one housing, which not only has a simple structure and is suitable for industrialized mass production, but also can be used in traditional Based on the structural arrangement of the two-stage three-way catalytic converter, one three-way catalytic converter is omitted, and at the same time, the arrangement of exhaust pipes or bellows between the traditional two-stage three-way catalytic converters is omitted, which greatly saves Reduced manufacturing cost: 2) the three-way catalytic converter for vehicles provided by the utility model is arranged at the engine gas discharge outlet, so there is no need to use electric heating methods to preheat, and the heat of the tail gas itself discharged from the engine can also be used The purpose of rapid heating of the catalyst enables the three-way catalytic converter to achieve a good catalytic effect. 3) With the three-way catalytic converter for vehicles with this structure, when the three-way catalytic converter fails or is damaged and needs to be replaced, it is not necessary to replace the entire three-way catalytic converter, only the corresponding catalyst carrier needs to be replaced Just can, realized the convenient and flexible replacement.

Description of drawings

Fig. 1 is a structural sectional view of a preferred embodiment of the present invention.

Detailed ways

The utility model will be described in further detail below through specific preferred embodiments in conjunction with the accompanying drawings.

Please refer to Fig. 1, a kind of three-way catalytic converter provided by the utility model, comprises housing 4 and the front end cover 1 that is connected in engine gas exhaust pipe and the rear end cover 2 that is connected in corresponding air pipe, and described front end cover 1 The two ends of the casing 4 are respectively connected with the rear end cover 2, and the catalyst carrier is arranged in the casing 4, especially, there are at least two catalyst carriers arranged inside the casing 4; the catalyst carrier is arranged along the The direction in which the engine exhaust flows is arranged in sequence, and the catalyst carrier is arranged within a distance of 80 cm from the exhaust flow of the engine to the side of the catalyst carrier away from the engine that is far away from the engine. Within the range, the exhaust gas emitted by the engine will not lose too much heat, and can flow to the catalyst carrier within the ideal working temperature range of the catalyst, and be effectively purified by the catalyst. The catalyst carrier is made of honeycomb ceramic material, which can be a carrier of 400cpsi or 600cpsi, and the carrier is loaded with a catalyst, and the catalyst includes three noble metals of platinum, rhodium and palladium. Preferably, in this implementation, there are two catalyst carriers, namely catalyst carrier 6 and catalyst carrier 8, two catalyst carriers are selected, and the distance between the two catalyst carriers is 25-35mm, preferably 28 mm. -32mm, both use 400cpsi, and through the coordination of the relevant parameters of the two catalyst carriers, it is enough to meet the national standard on the exhaust emission of automobiles above Euro III. Of course, if more catalyst supports are used, the same effect can be achieved, but the manufacturing cost will be greatly increased.

A partition 7 is provided on the housing 4 , the catalyst carrier 6 and the catalyst carrier 8 are arranged on both sides of the partition 7 , and the partition 7 separates the two catalyst carriers 6 and 8 . The spacer 7 can be a recess formed on the casing 4, and of course, it can also be a stopper provided on the casing 4, and the two catalyst carriers are separated by the recess or stopper. both sides of the block. Preferably, in this embodiment, the isolation portion 7 is a recess formed on the housing 4 . At the same time, on the other two sides of the housing 4 where the two catalyst carriers 6 and 8 are disposed away from the recess 7, there are respectively provided with retaining rings 3, and the two retaining rings 3 cooperate with the recess 7 of the housing. , play a positioning role on the two catalyst carriers 6 and 8. In addition, a damping layer 5 is arranged between the two catalyst carriers 6 and 8 and the housing 4, which plays a certain role in damping the two catalyst carriers 6 and 8 and reduces the vibration caused by the gap between the catalyst carrier and the housing. The noise generated by the contact bump between them.

Preferably, the lateral width of the catalyst carrier 6 is 40-70 mm, preferably 45-55 mm. The lateral width of the catalyst carrier 8 is 70-100 mm, preferably 75-85 mm; the cross-sectional diameter of the two catalysts is 98-109 mm, preferably 99-102 mm. In addition, it is also necessary to adjust the proportions of the three precious metals of platinum, rhodium and palladium supported on the two catalyst supports. After the engine exhaust gas is purified by the two-stage catalytic purification of the three-way catalytic converter, the exhaust gas is effectively purified and meets the relevant exhaust emission standards.

Preferably, in the present embodiment, the lateral widths of the catalyst carrier 6 and the catalyst carrier 8 are respectively 50mm and 80mm, and the diameter of the two carriers is 101.6mm; the catalyst carrier 6 adopts 400cpsi, and the relative concentration (platinum: rhodium: palladium) 0 : 1: 5, the catalyst carrier 8 adopts 400cpsi, the relative concentration (platinum: rhodium: palladium) 0: 1: 3 is used to match the engine with a displacement of 1.6L and below, and it can reach the standard above Euro 3.

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the utility model belongs, without departing from the concept of the utility model, some simple deduction or replacement can also be made, which should be regarded as belonging to the utility model by the submitted claims. Determine the scope of patent protection.

Claims (9)

1. A three-way catalytic converter, comprising a housing, a front end cover connected to the air pipe, and a rear end cover connected to the air pipe, the front end cover and the rear end cover are respectively connected to the two ends of the housing, and the housing A catalyst carrier is arranged in the body, and the characteristic is that there are at least two catalyst carriers arranged inside the casing. 2. The three-way catalytic converter according to claim 1, characterized in that: the catalyst carrier is arranged in sequence along the direction of the exhaust gas flow of the engine, and the catalyst carrier is arranged at the point where the exhaust gas flows from the engine. Within a distance of 80 cm to the side of the catalyst carrier away from the engine away from the engine. 3. The three-way catalytic converter according to claim 2, characterized in that: a partition is provided between the catalyst carriers of the housing. 4. The three-way catalytic converter according to claim 3, wherein the isolation part is a recess formed on the housing, or a stopper provided on the housing. 5. The three-way catalytic converter according to claim 4, characterized in that, on the outermost periphery of the housing provided with at least two catalyst carriers, the two catalyst carriers are respectively provided with gears on the outsides away from the isolation part. ring. 6. The three-way catalytic converter according to claim 1, characterized in that: a damping layer is also arranged between the catalyst carrier and the housing. 7. The three-way catalytic converter according to any one of claims 1 to 6, characterized in that the catalyst carrier is a honeycomb ceramic carrier. 8. The three-way catalytic converter according to claim 7, characterized in that there are preferably two catalyst carriers. 9. The three-way catalytic converter according to claim 8, characterized in that: the lateral widths of the two catalyst carriers arranged in sequence along the direction of engine exhaust flow are 40-70mm and 70-100mm respectively, And the distance between the two catalyst supports is 25-35mm.