CN209781006U - Integrated automobile exhaust purification device based on dielectric barrier discharge - Google Patents

Abstract

The utility model discloses an integrated automobile exhaust purification device based on dielectric barrier discharge, which comprises a DBD exhaust pipe, a tubular connector, a power converter, a vehicle-mounted power supply regulator and a smoke concentration measuring device; the DBD exhaust pipe comprises an outer tubular metal electrode, a central rod-shaped metal electrode, a central insulating sleeve and two groups of herringbone supporting frames; tubular connectionThe head is respectively connected with the tail gas pipe of the automobile and the outer tubular metal electrode; the central rod-shaped metal electrode is connected with a transformer through a lead, and the transformer and the vehicle-mounted power supply regulator are both connected with a vehicle-mounted storage battery; the central insulating sleeve is connected with the tubular connector and the outer tubular metal electrode through the inverted V-shaped support frame; each group of the herringbone support frames comprises three cylindrical support rods. The utility model discloses on the basis that does not influence the inside structure of itself of automobile engine to change as the target to the car minimum, effectively get rid of the NO among the automobile exhaust_XCO, HC and other main pollutants, and is powered by a vehicle-mounted storage battery.

Description

Integrated Vehicle Exhaust Gas Purification Device Based on Dielectric Barrier Discharge

technical field

The utility model relates to the technical field of automobile exhaust purification, in particular to an integrated automobile exhaust purification device based on dielectric barrier discharge.

Background technique

With the rapid development of my country's automobile industry, the number of automobiles has increased sharply, and the impact of automobile exhaust on urban air quality has begun to become prominent. Although the emergence of electric vehicles is expected to solve the problem of exhaust pollution to a certain extent, it is limited by battery technology and charging issues. The mileage of automobiles is not high, and the problem of charging, especially in non-big urban areas, is particularly prominent, and the manufacture and disposal of lithium batteries themselves also bring serious environmental pollution. Therefore, it is still a top priority to solve the problem of conventional fuel vehicle exhaust pollution.

The main pollutants of automobile exhaust are NO _X , CO, HC, etc. Currently, there are two main methods of purifying automobile exhaust as follows:

1. The three-way catalytic converter is used to promote the oxidation-reduction chemical reaction of the above pollutants through the purifying agent. However, this method is limited by the active conditions of the catalyst, and it needs to be heated, which consumes energy and is easy to cause spontaneous combustion of the car. In addition, the life of the catalyst is very limited.

2. Using water washing to filter automobile exhaust is also a method that has been extensively studied. However, this method is only effective for carbon particles and has higher requirements for the volume of the water tank.

With the development of non-equilibrium plasma-assisted combustion technology, it has shown good capabilities in improving combustion efficiency, shortening ignition delay, and stabilizing flame. Plasma is divided into equilibrium plasma and non-equilibrium plasma. The plasma generated by arc discharge belongs to equilibrium plasma and is often used for engine ignition. However, the corrosion of the electrode is very serious during the process of generating equilibrium state plasma through discharge, which makes it difficult to maintain it for a long time. Typical non-equilibrium occurrence methods mainly include dielectric barrier discharge, nanosecond pulse discharge, microwave discharge, etc. Among these discharge methods, the power supply system of nanosecond pulse discharge is complex, large in size, and accompanied by strong electromagnetic interference and other problems; microwave discharge produces plasma Body may cause harm to the human body, not suitable for vehicles.

The Chinese utility model patent application with the publication number CN102230410A is titled "A Plasma-Based Photocatalytic Automobile Exhaust Gas Purification Device", which uses titanium dioxide. Once the substance leaks, it will be difficult to get rid of it for a long time if it is inhaled by the human body.

The Chinese utility model patent application with the publication number CN103352744, the name of the utility model is "A Plasma Purifier for Automobile Exhaust Gas". , affecting automotive engine design.

The Chinese utility model patent application with the publication number CN109351140A, the name of the utility model is "a thermal plasma waste gas treatment device". The machining of the diameter section is difficult.

Utility model content

The technical problem to be solved by the utility model is to provide an integrated automobile exhaust purification device based on dielectric barrier discharge for the above-mentioned deficiencies in the prior art. On the basis of the internal structure, aiming at the minimum modification to the car, it effectively removes major pollutants such as NO _X , CO, and HC in the car exhaust, and relies on the car battery for power supply.

For solving the problems of the technologies described above, the technical scheme that the utility model adopts is:

An integrated vehicle exhaust purification device based on dielectric barrier discharge, comprising a DBD exhaust pipe, a tubular connector, a transformer, a vehicle power regulator and a smoke concentration measuring device.

The DBD exhaust pipe includes an outer tubular metal electrode, a central rod-shaped metal electrode, a central insulating sleeve and two sets of "herringbone"-shaped support frames.

The tubular connector includes a middle section and connecting ends located at both ends of the middle section, one of which is connected to the exhaust pipe of the automobile, and the other connecting end is connected to the outer tubular metal electrode.

The outer periphery of the central rod-shaped metal electrode is covered with a central insulating sleeve, and the central rod-shaped metal electrode covered with the central insulating sleeve is coaxially inserted into the outer tubular metal electrode.

The central rod-shaped metal electrode is connected to the transformer through wires, and both the transformer and the vehicle power regulator are connected to the vehicle battery.

The downstream tail end of the central insulating sleeve is a closed end, and the closed end is flush with the downstream tail end of the outer tubular metal electrode.

The outer wall of the central insulating sleeve is connected to the inner wall of the middle section of the tubular connector through a set of "herringbone"-shaped support frames, and connected to the inner wall of the outer tubular metal electrode through another set of "herringbone"-shaped support frames.

Each set of "herringbone"-shaped support frames includes three cylindrical support rods uniformly arranged along the circumferential direction.

The annular channel between the central insulating sleeve and the outer tubular metal electrode is the vehicle exhaust gas treatment channel, and the flue gas concentration measuring device is used to measure the flue gas at the outlet of the vehicle exhaust gas treatment channel.

The inner diameters of the automobile exhaust pipe, the tubular connector and the outer tubular metal electrode are equal.

The outer diameters of the automobile exhaust pipe, the tubular connector and the outer tubular metal electrode are also equal.

The two connecting ends of the tubular connector are externally threaded. The outer tubular metal electrode includes a discharge section and an internally threaded section. The wall thickness of the internally threaded section is smaller than that of the discharge section. One of the external thread connection ends is threaded, and the other external thread connection end is threaded with the automobile exhaust pipe.

The length of the discharge section shall not exceed 10 times the length of the internal thread connection section.

The inner wall surface of the discharge section is machined with shallow threads.

The central rod-shaped metal electrode is threadedly connected with the central insulating sleeve.

One of the support columns in a set of "herringbone"-shaped support frames connected to the tubular connector is provided with a threading hole, and the tubular connector corresponding to the position of the threading hole is provided with an outer threading hole, which is consistent with the position of the threading hole. The corresponding central insulating sleeve is provided with an inner threading hole, and the wire is connected to the central rod-shaped metal electrode after passing through the outer threading hole, the threading via hole and the inner threading hole in sequence.

Tubular connectors, central insulating sleeves and support columns are all ceramic.

The utility model has the following beneficial effects:

1. The generation of plasma based on dielectric barrier discharge to control automobile exhaust pollutants has the advantages of fast response speed, rapid discharge response, large adjustable range of parameters, and long-term operation of electrodes.

2. It is easy to process, and the configuration adopted is very compatible with the automobile exhaust pipe structure. The modular design is easy to disassemble and assemble. The designed central rod-shaped metal electrode and support rod have little obstruction to the exhaust gas flow, and the support rod can form a fall-off The vortex and recirculation zone make the discharge of exhaust gas more fully.

3. It can purify the main polluting gases such as NO _X and CO into non-toxic and non-polluting gases, and can adsorb carbon black and carbon oxide particles, and realize the regulation and control of the purification effect through the on-board power regulator, and the discharge Mode discharge power is usually less than 100 W.

4. It is integrated with the original automobile exhaust pipe structure and does not occupy additional space.

Description of drawings

Fig. 1 shows the overall structure diagram of an integrated vehicle exhaust purification device based on dielectric barrier discharge of the present invention.

Figure 2 shows a perspective view of the DBD exhaust pipe.

Figure 3 shows an axial cross-section of the DBD exhaust pipe.

Figure 4 shows a radial cross-section of the DBD exhaust pipe.

Figure 5 shows a perspective view of the central rod-shaped metal electrode.

Figure 6 shows a perspective view of the central insulating sleeve.

Figure 7 shows an axial sectional view of the central insulating sleeve.

Figure 8 shows a perspective view of the tubular connector.

Figure 9 shows an axial section of the tubular connector.

Figure 10 shows a perspective view of the outer tubular metal electrode.

Figure 11 shows an axial cross-sectional view of the outer tubular metal electrode.

Figure 12 shows a structural diagram of the support rod without a threading hole.

Fig. 13 shows the structural diagram when the support rod contains the threading hole.

Figure 14 shows a schematic diagram of the recirculation zone formed downstream of the support rod.

Figure 15 shows a schematic diagram of the low flow zone formed downstream of the struts.

Figure 16 shows a schematic diagram of the size layout of the DBD exhaust pipe when the inner diameter of the automobile exhaust pipe is 40 mm.

Including:

10. DBD exhaust pipe;

11. Outer tubular metal electrode; 111. Internal thread connection section; 12. Center rod-shaped metal electrode; 13. Center insulating sleeve; 131. Inner threading hole; 14. Support rod; 141. Threading hole;

20. Tubular connector; 21. External thread connection end; 22. Middle section; 221. Outer threading hole;

30. Transformer; 40. Vehicle battery; 41. Vehicle power regulator;

50. Smoke concentration measuring device; 51. Measuring probe;

60. Recirculation zone; 61. Streamline; 62. Low velocity zone.

Detailed ways

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

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "left side", "right side", "upper part" and "lower part" are based on the orientation or positional relationship shown in the accompanying drawings, only It is for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and "first", "second" and the like do not mean zero The importance of components, upstream and downstream are distinguished by the direction of exhaust gas, so it cannot be understood as a limitation of the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present utility model.

As shown in FIG. 1 , an integrated vehicle exhaust purification device based on dielectric barrier discharge includes a DBD exhaust pipe 10 , a tubular connector 20 , a transformer 30 , a vehicle power regulator 41 and a smoke concentration measuring device 50 .

As shown in FIG. 8 and FIG. 9 , the tubular connector includes a middle section 22 and connection ends located at both ends of the middle section. The middle section is preferably provided with an outer threading hole 221 .

The two connecting ends of the tubular connector are preferably externally threaded connecting ends 21, the upstream externally threaded connecting end is threadedly connected to the automobile exhaust pipe, and the downstream externally threaded connecting end is threadedly connected to the outer tubular metal electrode.

The inner diameter of the tubular connector is preferably equal to the inner diameter of the automobile exhaust pipe, and the outer diameter of the middle section is preferably equal to the outer diameter of the automobile exhaust pipe.

Before the tubular connector is assembled with the automobile exhaust pipe, an annular groove with the same length as the upstream external thread connection end is excavated on the inner wall of the outlet end of the automobile exhaust pipe, and then the internal thread is formed on the annular groove, so that the tubular The connectors form a good fit with the exhaust pipe of the car.

The existence of the tubular connector can also ensure that the discharge only occurs in the annular channel between the outer tubular metal electrode and the central rod-shaped metal electrode downstream of the tubular connector. Since the tubular connector itself is made of ceramics, the threaded connection section between the tubular connector and the internal thread section is blocked by a layer of ceramic insulating medium compared with the downstream discharge section, so that the discharge section will preferentially discharge after the voltage is applied, and the threaded section Then no discharge occurs.

As shown in Figures 2 to 4, the DBD exhaust pipe includes an outer tubular metal electrode 11, a central rod-shaped metal electrode 12, a central insulating sleeve 13 and two sets of "herringbone"-shaped support frames.

As shown in Figures 11 and 12, the outer tubular metal electrode includes a discharge section and an internal thread connection section 111. The wall thickness of the internal thread connection section is smaller than the wall thickness of the discharge section. Excavate an annular groove with the same length as the internal thread connection section on the inner wall, and then carve the internal thread on the annular groove to form an internal thread connection section, so that the inner and outer diameters of the outer tubular metal electrode can be aligned with the automobile exhaust pipe and tubular The connectors should be consistent to prevent the exhaust gas from the engine from flowing in the pipeline. If they are not consistent, the inner diameter of the downstream may become smaller and gas congestion and other problems may occur.

The inner wall surface of the discharge section is processed with shallow threads for strengthening the discharge. The length of the discharge section shall not exceed 10 times the length of the internal thread connection section.

The central rod-shaped metal electrode, as shown in FIG. 5 , has an outer periphery covered with a central insulating sleeve, and the central rod-shaped metal electrode and the central insulating sleeve are preferably threaded.

The central rod-shaped metal electrode covered with the central insulating sleeve is coaxially inserted in the outer tubular metal electrode.

As shown in Figures 6 and 7, the upstream end of the central insulating sleeve is open, and the downstream end is a closed end, which is flush with the downstream end of the outer tubular metal electrode. The design of the central insulating sleeve can realize the wrapping and position fixing of the central rod-shaped metal electrode inside, and the downstream tail end can be closed to prevent edge discharge at the outlet of the DBD exhaust pipe.

The annular channel between the central insulating sleeve and the outer tubular metal electrode is the vehicle exhaust gas treatment channel, also known as the air gap or the discharge gap.

The outer wall of the central insulating sleeve is connected to the inner wall of the middle section of the tubular connector through a set of "herringbone"-shaped support frames, and connected to the inner wall of the outer tubular metal electrode through another set of "herringbone"-shaped support frames.

The "herringbone"-shaped support rod not only supports and fixes the central rod-shaped metal electrode and the central insulating sleeve, but also isolates the high-voltage wire from the outer tubular metal electrode to prevent preferential discharge between the high-voltage wire and the outer tubular metal electrode.

Each group of "herringbone"-shaped support frames includes three support rods 14 uniformly arranged along the circumference, as shown in FIG. 12 , each support rod is cylindrical.

A threading hole 141 as shown in Figure 13 is opened in one of the supporting columns of the "herringbone"-shaped support frame located upstream. The threading hole corresponds to the position of the outer threading hole, and the center insulation corresponding to the position of the threading hole An inner threading hole 131 is opened on the casing.

Tubular connectors, central insulating sleeves and support columns are all ceramic.

The position setting of the upstream "herringbone"-shaped support frame, on the one hand, can make the inner and outer diameters of the outer tubular metal electrode consistent with the automobile exhaust pipe and the tubular connector; on the other hand, because the tubular connector is made of ceramic material, it is convenient to open the outer threading hole , to facilitate the passage of wires and prevent discharges between the wires and the outer tubular metal electrode in the downstream DBD exhaust pipe.

In addition, the axial distance between the upstream "herringbone"-shaped support frame and the upstream end of the outer tubular metal electrode (that is, the upstream end of the internal thread connection section) is not less than the thickness of the discharge gap, so as to prevent the gap between the high-voltage wire and the outer tubular metal electrode. Priority discharge.

In the utility model, the outer tubular metal electrode is grounded to form a ground electrode; the central rod-shaped metal electrode is connected to the transformer through a wire to form a high-voltage electrode; wherein, the wire passes through the outer threading hole, the threading via hole and the inner threading hole in turn and connects with the center The rod-shaped metal electrodes are connected.

Both the transformer and the vehicle power regulator are connected to the vehicle battery 40, and the discharge type is preferably microsecond, millisecond pulse discharge or high frequency AC discharge.

The smoke concentration measuring device 50 is used to measure the smoke at the outlet of the vehicle exhaust treatment channel. The flue gas concentration measuring device is preferably a hand-held flue gas concentration analyzer, and its measuring probe 51 is placed at the exit of the vehicle exhaust treatment channel to measure the flue gas at the exit of the vehicle exhaust treatment channel.

Taking specific examples below, the layout method of the exhaust pipe of the automobile, the tubular connector and the inner diameter of the outer tubular metal electrode is introduced in detail.

As shown in Figure 16, for the exhaust pipe of a common car, the inner diameter of the exhaust pipe of the automobile is 40mm, and the dimension unit in the figure is mm.

The inner diameter of the pipe fitting connector is 40mm, the wall thickness of the external thread connection end is 3-10mm, the wall thickness of the middle section is 6-15mm, the axial length of the two thread connection ends is greater than 20mm, and the length is as long as possible on the basis of ensuring reliable connection Small; the diameters of the outer threading hole, the threading via hole and the inner threading hole are all 1-3mm.

The diameter of the support rod is 6-15mm. Among them, the axial position of the inlet end of the upstream "herringbone" support frame is more than 5 mm from the opening end of the central insulating sleeve to ensure the balance of the central insulating sleeve and the electrode.

In addition, the distance between the center of the support rod in the upstream "chevron" support frame and the opening of the upstream external threaded connection end is not less than 8 mm. The advantage of this is to prevent the direct discharge between the wire and the nearest external electrode, while the discharge does not occur in the downstream discharge area.

The wall thickness of the discharge section in the outer tubular metal electrode is 6-15 mm, which is kept flush with the inner and outer surfaces of the tubular connector after assembly; the diameter of the central rod-shaped metal electrode is 8-15 mm, and the wall thickness of the central insulating sleeve is 3-5 mm. After connection, the outlet section is flush, and the wall thickness of the closed end of the central insulating sleeve is 3-6 mm.

The specific assembly method is: one end of the tubular connector is threaded to the automobile exhaust pipe, and the other end is threaded to the outer tubular metal electrode of the DBD exhaust pipe. The above thread adopts a sealed thread or adds a sealant/tape; The central rod-shaped electrode is screwed into the central insulating sleeve, that is, the central insulating sleeve wraps the central rod-shaped metal electrode, and the function of the closed end is to axially fix the central electrode, and the two are connected by threads; The support frame supports the central rod-shaped metal electrode and the central insulating sleeve. The adjacent support rods in a single set of "herringbone"-shaped support frames are arranged at 120°, and the distance from the center of a support rod in the "herringbone"-shaped support frame at the intake end There is a 1 mm threading hole, which is aligned with the inner threading hole and the outer threading hole to ensure that the wire passes through and contacts the central rod-shaped metal electrode.

The tubular connector, the central insulating sleeve and all the support rods are made of ceramics, and the material of the central rod-shaped metal electrode and the outer tubular metal electrode can be common electrode metals such as steel and copper. The support rod, the outer tubular metal electrode, the tubular connector and the central insulating sleeve are all threaded.

The layout of the support rods can ensure that the airflow is blocked evenly. According to the principle of aerodynamics, as shown in Figure 14, for the exhaust gas to flow, the downstream of each support rod will form a recirculation zone 60, which is also conducive to extending the exhaust gas flow in the DBD exhaust pipe. The residence time, strengthen the discharge reaction.

Since the support rod is a cylinder and is perpendicular to the flow direction of the exhaust pipe, a classic flow field around the cylinder is formed. The streamline diagram of the flow field is shown in Figure 14. It can be seen that due to the existence of the cylinder, A pair of recirculation zones 60 are formed downstream of the cylinder close to the cylinder. According to the knowledge of fluid mechanics, the fluid particles in the recirculation zone may even move upstream; Fig. 15 shows the cloud diagram of the flow field velocity distribution around the cylinder. As far as flow is concerned, the recirculation zone is obviously a low flow velocity zone 62, and can affect the far downstream position of the cylinder, so the automobile exhaust will form a corresponding recirculation zone and a downstream low flow velocity zone after passing through each support rod, so that the exhaust gas In it, the residence time is significantly increased, and the discharge starts downstream of the support rod of the tubular joint, that is, the discharge time on each fluid particle becomes longer, and the discharge-related reactions such as ionization, decomposition, and oxidation are carried out more thoroughly, so The purification effect on exhaust gas is better. In addition, due to the adoption of two sets of upstream and downstream support rods, a total of 6 support rods, while saving materials to the greatest extent, it plays a good role in supporting and fixing the central rod-shaped metal electrode and the central insulating sleeve. The deceleration effect of the circumvention makes the exhaust gas purification by the DBD exhaust pipe more thorough, and the symmetrical support frame design scheme can maintain the symmetry of the air flow field structure in the exhaust pipe to the greatest extent, so that the discharge effect on the entire exhaust gas is more uniform.

In the utility model, the selection of the number and diameter of the support rods is also designed after long-term repeated tests. Through the above analysis, it can be seen that the larger the diameter of the support rods, the lower the flow rate of the downstream recirculation zone and the lower flow rate when the tail gas flow conditions remain unchanged. The larger the volume of the zone, the longer the residence time of the exhaust gas in it, and the better the exhaust gas treatment effect. However, if the diameter of the support rod is too large, it will seriously affect the effective passing area of the DBD exhaust pipe, which may cause exhaust gas congestion and high exhaust temperature, because if the passing area of the exhaust pipe is too small, the heat will not be dissipated, which will cause explosion hazards .

Therefore, in this utility model, three support rods are selected for each group of "herringbone"-shaped support frames, which has the least impact on the passing area and can save materials, and the diameter design must ensure a certain strength and rigidity to effectively support the central rod-shaped metal electrodes. Moreover, symmetrical recirculation zones and low-velocity zones will be formed downstream of the three support rods, thereby prolonging the residence time of the exhaust gas and making the ionization treatment of the exhaust gas more sufficient.

When the DBD exhaust pipe is working, it is powered by the vehicle’s own battery, and the continuous DC voltage of the vehicle battery is converted into one of microsecond, millisecond pulse voltage or high-frequency AC voltage through a transformer, and applied to the DBD through a wire. On the exhaust pipe electrode, a dielectric barrier discharge will be formed between the central insulating sleeve and the outer tubular metal electrode. The gas discharged from the automobile engine will enter the DBD exhaust pipe after passing through a section of pipeline (tubular joint). When flowing through the discharge area It is ionized to form a typical non-equilibrium plasma, in which a series of discharge reactions and traditional chemical reactions occur, reducing or eliminating harmful gases and solid particles, thereby forming a clean tail gas and discharging it into the atmosphere. Since the state of the exhaust gas is different under different working conditions such as starting, turning off the engine, and different gears, a handheld flue gas analyzer can be used to detect the processed exhaust gas at the exhaust port. The concentration of CO, NO, NO ₂ , SO, SO ₂ and other substances in the product can be measured in the end pipe of the trachea; then the discharge parameters applied to the DBD exhaust pipe are applied to the discharge parameters of the DBD exhaust pipe through the on-board power regulator, and the exhaust gas is monitored by the flue gas analyzer Component concentrations vary, allowing for optimal power control.

Implementation process

Taking a gasoline car as an example, when the car engine is working, the fuel reacts with the air, and produces CO ₂ and H ₂ O and excess oxygen during normal combustion. However, because the fuel contains impurities and the fuel is often incompletely burned, the Some harmful substances will be emitted, mainly CO, NO, NO ₂ and some carbon particles. When the engine is aerodynamically activated, the integrated vehicle exhaust gas purification device is turned on through the on-board power regulator, and the exhaust gas enters the integrated vehicle exhaust gas purification device shortly after leaving the engine to undergo a discharge reaction. The electron collision reaction rate is often much higher than the traditional combustion chemical reaction, which is very effective. It is conducive to the rapid formation of active groups such as O, N, OH and continued oxidation reactions, such as: discharge ionization reaction e+O ₂ ⟶e+O+O, e+N ₂ ⟶e+N+N, the activity generated by ionization Particles undergo a series of oxidation reactions and reduction reactions O+CO⟶CO ₂ , N + NO ⟶ O + N ₂ , N + NO ₂ => O + O + N ₂ , N + NO ₂ => N ₂ + O ₂ , O + NO => N + O ₂ , O + N ₂ O => N ₂ + O ₂ , so as to achieve the purpose of purifying the main pollutants CO, NO, and NO ₂ in the tail gas. In addition, the carbon particles in the exhaust gas are mainly carbon black and some metal oxides. Carbon black and metal oxides have certain conductivity. After the discharge is applied, these particles will move directionally according to their respective charged states and be adsorbed on the outer tubular metal electrode. And the surface of the central insulating sleeve, because the integrated automobile exhaust purification device adopts a modular design, when there are many impurities deposited on the two surfaces, the outer tubular metal electrode can be removed and the inner and outer surfaces of the two can be cleaned, and then continue to be used after installation. During the exhaust gas treatment process, the handheld flue gas analyzer can be used to monitor the concentration of harmful substances such as CO and NO in the exhaust gas online. When the concentration is found to be high, the on-board power regulator can be operated to change the discharge voltage, pulse frequency, pulse width and other parameters. , so as to change the discharge characteristics, and then achieve the effect of changing the concentration of harmful substances in the exhaust gas. When the discharge parameters are adjusted, it is found that the concentration of harmful substances in the exhaust gas has reached the standard, and the adjustment parameters can be kept unchanged. Otherwise, continue to change the adjustment parameters until the concentration of harmful substances in the exhaust gas reaches the standard .

The preferred embodiment of the utility model has been described in detail above, but the utility model is not limited to the specific details in the above-mentioned embodiment, and within the scope of the technical concept of the utility model, various equivalent transformations can be carried out to the technical solution of the utility model , these equivalent transformations all belong to the protection scope of the present utility model.

Claims (9)

1. The utility model provides an integration automobile exhaust purifier based on dielectric barrier discharge which characterized in that: the device comprises a DBD exhaust pipe, a tubular connector, a power converter, a vehicle-mounted power supply regulator and a smoke concentration measuring device;

The DBD exhaust pipe comprises an outer tubular metal electrode, a central rod-shaped metal electrode, a central insulating sleeve and two groups of herringbone supporting frames;

The tubular connector comprises a middle section and connecting ends positioned at two ends of the middle section, wherein one connecting end is connected with the automobile exhaust pipe, and the other connecting end is connected with the outer tubular metal electrode;

The periphery of the central rod-shaped metal electrode is coated with a central insulating sleeve, and the central rod-shaped metal electrode coated with the central insulating sleeve is coaxially inserted in the outer tubular metal electrode;

The central rod-shaped metal electrode is connected with a transformer through a lead, and the transformer and the vehicle-mounted power supply regulator are both connected with a vehicle-mounted storage battery;

The downstream tail end of the central insulating sleeve is a closed end which is flush with the downstream tail end of the outer tubular metal electrode;

The outer wall surface of the central insulating sleeve is connected with the inner wall surface of the middle section of the tubular connector through one group of herringbone supporting frames and is connected with the inner wall surface of the outer tubular metal electrode through the other group of herringbone supporting frames;

Each group of the herringbone support frames comprises three cylindrical support rods which are uniformly distributed along the circumferential direction;

The annular channel between the central insulating sleeve and the outer tubular metal electrode is an automobile exhaust treatment channel, and the flue gas concentration measuring device is used for measuring the flue gas at the outlet of the automobile exhaust treatment channel.

2. The integrated automobile exhaust purification device based on dielectric barrier discharge as claimed in claim 1, wherein: the inner diameters of the automobile tail gas pipe, the tubular connector and the outer tubular metal electrode are equal.

3. The integrated automobile exhaust purification device based on dielectric barrier discharge as claimed in claim 2, wherein: the outer diameters of the automobile tail gas pipe, the tubular connector and the outer tubular metal electrode are also equal.

4. The integrated automobile exhaust gas purification device based on dielectric barrier discharge according to claim 1, 2 or 3, wherein: two links of tubulose connector are the external screw thread link, and outer tubulose metal electrode includes discharge section and female connection section, and the wall thickness of female connection section is less than the wall thickness of discharge section, and one of them external screw thread link threaded connection of female connection section and tubulose connector, another external screw thread link and automobile exhaust pipe threaded connection.

5. The integrated automobile exhaust purification device based on dielectric barrier discharge as claimed in claim 4, wherein: the length of the discharge section is not more than 8 times of the length of the internal thread connecting section.

6. The integrated automobile exhaust purification device based on dielectric barrier discharge as claimed in claim 4, wherein: shallow screw threads are processed on the inner wall surface of the discharge section.

7. the integrated automobile exhaust gas purification device based on dielectric barrier discharge according to claim 1, 2 or 3, wherein: the central rod-shaped metal electrode is in threaded connection with the central insulating sleeve.

8. The integrated automobile exhaust gas purification device based on dielectric barrier discharge according to claim 1, 2 or 3, wherein: a threading through hole is formed in one supporting column in a group of inverted V-shaped supporting frames connected with the tubular connectors, an outer threading hole is formed in the tubular connector corresponding to the threading through hole, an inner threading hole is formed in the central insulating sleeve corresponding to the threading through hole, and a lead sequentially penetrates through the outer threading hole, the threading through hole and the inner threading hole and then is connected with the central rod-shaped metal electrode.

9. The integrated automobile exhaust gas purification device based on dielectric barrier discharge according to claim 1, 2 or 3, wherein: the tubular connector, the central insulating sleeve and the support column are all made of ceramic materials.