CN204082269U - A kind of diesel particulate trap subregion electric heating reclaimer - Google Patents

Abstract

A partition electric heating regeneration device for a diesel particulate filter, which is composed of an engine exhaust intake pipe, a large end of an intake variable diameter pipe, a packaging case, and a large end of an air outlet variable diameter pipe connected in sequence, and the support plate is composed of a ring and a diameter along the diameter The rotating baffle is fixed on the spokes of the support plate through bearings, and the shaft of the stepping motor is connected with the sleeve of the rotating baffle through a key. The resistance wire is arranged in the channel of the diesel particulate filter. When regeneration is required, the stepper motor drives the rotary baffle to rotate to the regeneration area, so that the flow in this area drops immediately, and at the same time, the resistance wire is connected to energize to achieve the purpose of regeneration. The device has a simple structure, can run for a long time, and has the advantages of convenient disassembly and assembly, reliable performance and the like.

Description

Partition electric heating regeneration device for diesel particulate filter

technical field

The utility model relates to an automobile tail gas post-treatment system, in particular to a device for electrically heating and regenerating a particle catcher of a diesel engine in partitions.

Background technique

Diesel engines are widely used in the transportation industry due to their high thermal efficiency and low _CO2 emissions. However, its particulate matter emission is large (30 to 80 times that of a gasoline engine with the same displacement), causing serious pollution to the environment and endangering human health, thus severely restricting its development. Therefore, stringent emission standards require effective and reliable technologies to reduce particulate matter emissions. From a technical point of view, it is difficult to meet the current emission standards only by internal purification and improvement of fuel quality. At present, diesel engines that meet the "National IV" emission regulations generally use after-treatment technology, and stricter emission regulations in the future will put forward higher requirements for after-treatment technology. Diesel Particulate Filter (DPF, Diesel Particulate Filter) is recognized as the most effective particulate matter purification device (physically captures diesel engine particles, and the efficiency is often higher than 95%), and it is also one of the technologies with the best commercial prospects in current purification technologies.

The deposition of diesel particulate matter inside the DPF will increase the pressure drop at both ends and affect engine performance. Therefore, it is necessary to remove the deposited particulate matter, that is, regeneration technology. Among them, the electric heating regeneration technology is widely studied, but its regeneration power is large, and the vehicle power supply can only provide limited power. Therefore, a single low-power regeneration is realized by partitioning the DPF. In terms of partition electric heating regeneration technology, General Motors Global Technology Operations Company of the United States has a mature system that uses shutters to realize partitions, but there are defects in complex structures.

Utility model content

The purpose of this utility model is to provide a diesel engine particulate filter zoned electric heating regeneration device that achieves a single low power regeneration by partitioning the DPF when the vehicle power supply can only provide limited power.

The purpose of this utility model is achieved in this way: a diesel engine particulate trap partition electric heating regeneration device, including an electric heating device, the engine exhaust intake pipe is connected to the small end of the conical intake variable diameter pipe, the intake variable diameter There is an air inlet flange on the big end of the tube, and an air outlet flange on the big end of the conical air outlet variable diameter tube. The air inlet flange on the large end of the diameter pipe and the air outlet flange on the large end of the air outlet variable diameter pipe are bolted. The circular ring part is clamped between the air inlet flange on the large end of the air intake reducing pipe and the front flange of the package housing; the diesel engine particulate filter whose air inlet is divided into 8 fan-shaped partitions is installed on the Encapsulated in the shell; the shaft of the stepping motor penetrates into the engine exhaust intake pipe and the intake reducer pipe along the center line of the intake reducer pipe, and the outer shell of the support plate bearing is welded on the multiple spokes of the support plate; the rotating baffle It is composed of a shaft sleeve and a fan-shaped plate arranged on the shaft sleeve. The shaft sleeve of the rotating baffle is fixed on the shaft of the stepper motor through a key connection in a sleeve manner, and the shaft sleeve of the rotating baffle is fixed on the inner ring of the support plate bearing. ; The 8 groups of resistance wires of the electric heating device are respectively arranged in each channel of the 8 fan-shaped partitions of the diesel particulate filter; the central angle of the fan-shaped plate of the rotating baffle is 45°, and the radius of the fan-shaped plate is less than The inner cavity radius of the encapsulation shell.

A bearing is arranged at the penetration place of the shaft of the stepping motor on the exhaust and intake pipe of the engine: the outer ring of the bearing is welded on the wall of the exhaust and intake pipe of the engine, and the shaft of the stepping motor is fixed on the inner ring of the bearing superior.

The spokes on the support disc are 8 spokes evenly distributed.

There are 3 resistance wires in each group, and the 3 resistance wires in parallel state are arranged in the channel of each fan-shaped partition of the diesel particulate filter in the shape of a paper clip; And it is connected with the power supply circuit of the electric heating device.

The DPF sealing cloth plays the role of protecting the diesel particulate filter from damage and sealing, and at the same time, it is convenient for disassembly and assembly.

It also has a single-chip microcomputer and a stepping motor control circuit connected with the single-chip microcomputer, and the single-chip microcomputer is connected with the power supply circuit of the above-mentioned electric heating device.

There is a DPF sealing cloth between the diesel particulate filter and the packaging casing.

The beneficial effects of the utility model are:

1. The device of the utility model has simple structure and unique design, and can run for a long time. It can be built using commonly used instruments and equipment.

2. Rotary baffle partition. The rotary baffle rotates to the regeneration area, and the flow in this area immediately drops to restrict the flow.

3. Low regenerative power. A single low-power regeneration is realized by partitioning the DPF by utilizing the limited power on-board power supply.

4. Easy to assemble and disassemble. When replacing the filter medium, you only need to open the air outlet flange and move the DPF sealing cloth to realize the replacement.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2a and Fig. 2b are respectively the front view and the left side view of the supporting plate shown in Fig. 1 .

FIG. 3 is a schematic diagram of DPF partitions.

Figure 4a and Figure 4b are the distribution diagram of the resistance wire circuit of each DPF fan-shaped partition and the diagram of the insertion mode of the resistance wire of the whole DPF respectively.

Fig. 5 is a position distribution diagram of the rotating baffle.

Detailed ways

Fig. 1 shows a kind of district electric heating regeneration device of a diesel particulate filter, including an electric heating device, an engine exhaust intake pipe 1 connected to the small end of a conical intake reducing pipe 2, and the large end of the intake reducing pipe An air inlet flange is provided on the top, and an air outlet flange is provided on the large end of the conical air outlet reducing pipe 5, and the front and rear end flanges of the cylindrical packaging shell 4 are respectively connected with the air inlet reducing pipe. 2 The air inlet flange on the large end and the air outlet flange on the large end of the air outlet variable diameter pipe 5 are connected by bolts. The support plate 3 is composed of a ring and a plurality of radially arranged spokes on the inner opening of the ring, see Fig. 2a, Fig. 2b, the ring portion of the support plate 3 is clamped between the air inlet flange on the large end of the air inlet reducing pipe 2 and the front end flange of the packaging shell 4; the air inlet is divided into 8 The diesel particulate filter 7 of the sector-shaped partition is installed in the package housing 4; the shaft of the stepper motor 12 penetrates in the engine exhaust intake pipe 1 and the intake pipe 2 along the center line of the intake pipe, The outer shell of the support disc bearing 9 is welded on the multiple spokes of the support disc 3; the rotating baffle 8 is composed of a shaft sleeve and a fan-shaped plate arranged on the shaft sleeve, and the shaft sleeve of the rotating baffle 8 is fixed through a keyed connection in a sleeve manner On the shaft of the stepper motor 12, the axle sleeve of the rotating baffle 8 is fixed on the inner ring of the support plate bearing 9; the resistance wire of the electric heating device is arranged in the diesel particulate trap 7 passages; the rotating baffle The central angle of the fan-shaped plate of 8 is 45° (see FIG. 5 ), and the radius of the fan-shaped plate is smaller than the radius of the inner cavity of the packaging case. The intake reducing pipe 2 and the outlet reducing pipe 5 are symmetrical in shape. The ring and the spokes of the support disc 3 are integrally arranged. A bearing is arranged at the penetration place of the shaft of the stepping motor 12 on the engine exhaust and intake pipe 1: the outer ring of the bearing is welded on the wall of the engine exhaust and intake pipe, and the shaft of the stepping motor is fixed on the inner ring of the bearing superior. The spokes on the support disc 3 are 8 spokes evenly distributed. There are 3 resistance wires in each group, and the 3 resistance wires in parallel state are arranged in the channel of each of the 8 fan-shaped partitions of the DPF in a paperclip shape; The wiring harness port 10 is drawn out and connected to the power supply circuit of the electric heating device (see FIG. 3 , FIG. 4 a , and FIG. 4 b ), and the power supply circuit is respectively energized for heating. It also has a single-chip microcomputer and a stepping motor control circuit connected with the single-chip microcomputer, and the single-chip microcomputer is connected with the power supply circuit of the above-mentioned electric heating device to control the on-off of the power supply. There is a DPF sealing cloth 6 between the diesel particulate filter 7 and the packaging case 4 .

Referring to Fig. 1, a partition electric heating regeneration device for a diesel particulate filter includes: an engine exhaust intake pipe 1, an intake variable diameter pipe 2, a support plate 3, a packaging shell 4, an air outlet variable diameter pipe 5, and a DPF sealing cloth 6. Diesel particulate filter (DPF) 7. Rotating baffle 8. Support plate bearing 9. Resistive wire harness opening 10. Single-chip microcomputer 11. Stepping motor 12.

The engine exhaust intake pipe 1 is the exhaust port of the engine exhaust; the air intake variable diameter pipe 2 plays the role of changing from a small diameter to a large diameter; The flange, the support plate 3, and the air outlet flange on the large end of the air outlet variable diameter pipe 5 are connected; the air outlet variable diameter pipe 5 plays the role of changing from a large diameter to a small diameter.

There is a certain distance between the rotating baffle 8 and the packaging shell 4 (that is, a gap to allow airflow to pass through), the purpose of which is to limit the passing flow in the area where the rotating baffle 8 is located so as to limit the flow and reduce the power required for regeneration.

Rotary baffle plate 8 is connected and fixed with stepping motor 12 rotating shafts by key. When regeneration is needed, the stepper motor 12 rotates to drive the rotary baffle 8 to rotate to the regeneration area, at this moment the flow in this area drops immediately, and the resistance wire in this area is connected to energize at the same time, thereby achieving the purpose of regeneration.

The rotating shaft of the stepping motor 12 is connected with the wall of the engine exhaust intake pipe 1 through a bearing, and is sealed by a rubber ring. In order to avoid high temperature damage to the sealing gasket, the distance between the wall of the engine exhaust intake pipe 1 and the diesel particulate filter (DPF) 7 should be as long as possible.

Support disc 3 and support disc bearing 9, engine exhaust intake pipe 1 pipe wall and bearing all adopt welding to fix.

The resistance wire harness opening 10 is the centralized wire harness opening of the resistance wire on the rotary baffle.

The dimensions of the air inlet reducing pipe 2, the support plate 3, the packaging shell 4, the air outlet reducing pipe 5, and the rotating baffle 8 need to be changed according to the size of the DPF.

The DPF sealing cloth 6 plays the role of protecting the diesel particulate filter 7 from damage and sealing, and is convenient for disassembly and assembly at the same time.

The single-chip microcomputer 11 adopts a self-programmed control program, which mainly judges whether to regenerate according to the emission level of the engine, the regeneration limit load, the average driving condition of the vehicle, the number of regeneration areas and the regeneration power. During regeneration, combined with the above parameters, the regeneration time and regeneration interval time of each area can be calculated, and a basic control strategy can be obtained by considering a regeneration safety factor. Taking a light truck with "National III" emissions as an example, matching the DPF with a displacement volume ratio of 1 to 1.5 results in a regeneration time of 3 to 5 minutes, and a regeneration interval of 10 to 15 minutes, which can make the average DPF The load level is controlled at the level of 2 g/L, which will not have much impact on the work of the engine.

Referring to Fig. 2, the support disc 3 is composed of a ring and 8 radially distributed spokes on the inner opening of the ring, and the ring and the spokes are integrally arranged.

Referring to Figure 3, the DPF is divided into 8 partitions (forming 8 fan-shaped air inlets), which are partition 1 to partition 8 respectively. The reason is: when electric heating is used to regenerate the entire DPF, the required power is about 15-20 kW, but the vehicle power supply is far from meeting this power, and electric heating regeneration in partitions can effectively reduce the power required for regeneration, but there are too many partitions, and the control system complex, but there are too few partitions, the area of a single regeneration partition is large, and the power required for regeneration is still relatively large; therefore, considering the regeneration power provided by the on-board power supply and the current limiting control of the rotating baffle 8, the average flow section of the entire DPF It is divided into 8 partitions, and a specific area is regenerated each time in a certain order during regeneration.

Referring to Fig. 4a and Fig. 4b, the resistance wires in the channel of each sector in the 8 sectors of the DPF adopt multiple parallel resistance wires (3 resistance wires, 6 lead wires, in Fig. 4a, the first of the three resistance wires The ends are 101, 103, and 105, and the tail ends are 102, 104, and 106). In Figure 4b, the insertion method is a paper clip, the insertion depth is 10-20 mm, and it is installed close to the wall. This installation method can make the particles deposited in the upstream burn quickly, and the heat generated is transferred to the downstream through the air flow, thereby driving the regeneration of the entire area. The resistance wire arrangement used in the whole partition has the characteristics of uniform heating of the partition and small thermal stress. The resistance wire used for heating and regeneration is nickel-chromium wire (Cr20Ni80), with a diameter of 0.5 mm. Its advantages are good oxidation resistance, not easy to deform at high temperature, good plasticity, and uniform heating.

Referring to FIG. 5 , the rotating baffle 8 is fixed to the rotating shaft of the stepping motor 12 through a key connection. When regeneration is needed, the stepper motor 12 rotates to drive the rotary baffle 8 to rotate to the regeneration area, at this moment the flow in this area drops immediately, and the resistance wire in this area is connected to energize at the same time, thereby achieving the purpose of regeneration. There is a certain distance between the rotating baffle 8 and the packaging shell 4, the purpose is to limit the passing flow in the area where the rotating baffle 8 is located so as to limit the flow and reduce the power required for regeneration.

Claims (6)

1. A partition electric heating regeneration device for a diesel particulate filter, including an electric heating device, characterized in that the engine exhaust intake pipe (1) is connected to the small end of the conical intake reducer pipe (2) to The large end of the air reducing pipe (2) is provided with an air inlet flange, the large end of the conical air outlet reducing pipe (5) is provided with an air outlet flange, and the cylindrical packaging shell (4) The front and rear end flanges are respectively connected with the air inlet flange on the large end of the air inlet reducing pipe (2) and the air outlet flange on the large end of the air outlet reducing pipe (5), and the support plate (3) It is composed of a ring and a plurality of radially arranged spokes on the inner opening of the ring, and the ring part of the support plate (3) is clamped on the large end of the air inlet reducing pipe (2) and the air inlet flange and package between the front flanges of the housing (4); the diesel particulate filter (7) whose air intake is divided into 8 sector-shaped partitions is installed in the package housing (4); the axis of the stepping motor (12) The center line of the intake reducer pipe penetrates into the engine exhaust intake pipe (1) and the intake reducer pipe (2), and the shell of the support disc bearing (9) is welded to the multiple spokes of the support disc (3); The rotating baffle (8) is composed of a shaft sleeve and a fan-shaped plate arranged on the shaft sleeve. The shaft sleeve of the rotating baffle is fixed on the shaft of the stepping motor (12) through a keyed connection in a sleeve manner, and the shaft of the rotating baffle The sleeve is fixed on the inner ring of the support plate bearing (9); the 8 sets of resistance wires of the electric heating device are respectively arranged in each channel of the 8 sector-shaped partitions of the diesel particulate filter (7); the rotating baffle ( 8) The central angle of the fan-shaped plate is 45°, and the radius of the fan-shaped plate is smaller than the radius of the inner cavity of the packaging shell. 2. A diesel particulate filter zoned electric heating regeneration device according to claim 1, characterized in that, the engine exhaust intake pipe (1) is at the place where the shaft of the stepping motor (12) penetrates A bearing is provided: the outer ring of the bearing is welded on the wall of the engine exhaust intake pipe, and the shaft of the stepping motor is fixed on the inner ring of the bearing. 3. The district electric heating regeneration device for a diesel particulate filter according to claim 2, characterized in that the spokes on the support plate (3) are 8 spokes evenly distributed. 4. A partition electric heating regeneration device for a diesel particulate filter according to claim 3, characterized in that each group of resistance wires is three, and the three resistance wires in a parallel state are arranged on the diesel engine in a paperclip shape. The particle trap (7) is in the channel of each fan-shaped partition; the resistance wire is led out through the resistance wire bundle port (10) on the package casing (4) and connected to the power supply circuit of the electric heating device. 5. The district electric heating regeneration device of a diesel particulate filter according to claim 4, characterized in that it also has a single-chip microcomputer and a stepping motor control circuit connected with the single-chip microcomputer, and the power supply circuit of the single-chip microcomputer and the above-mentioned electric heating device connect. 6. A diesel particulate filter partition electric heating regeneration device according to claim 5, characterized in that there is a DPF sealing cloth ( 6).