A diesel particulate filter

Abstract

The present invention discloses a diesel particulate filter, which relates to an engine exhaust aftertreatment device. It includes a housing and a DPF unit; it further includes a blowing assembly, a driving assembly and an emission assembly; the DPF unit is movably installed in the housing, the driving assembly is arranged outside the housing, the driving assembly is provided with a driving end penetrating through the housing, and the driving end of the driving assembly is fixedly connected to the DPF unit; the blowing assembly is arranged above the housing, and the air outlet end of the blowing assembly is communicated with the inner cavity of the housing, and the air outlet end of the blowing assembly is located above the DPF unit; the emission assembly is arranged on the housing below the DPF unit. The present invention realizes decarbonization treatment of the DPF unit without disassembling it; compared with the prior art, its maintenance of the DPF unit is more convenient and more practical.

Description

Technical Field

[0001] The present invention relates to an engine exhaust after-treatment device, and more particularly, to a diesel particulate filter. Background Art

[0002] In order to improve the emission performance of the engine, an after-treatment device is installed in the existing engine exhaust manifold assembly. Among them, as a kind of after-treatment device, the particulate filter is usually installed on the exhaust manifold behind the supercharger through a mounting seat. When carbon accumulates in the DPF unit of the particulate filter, the required exhaust temperature needs to reach above 300 °C to burn off the carbon. However, not all carbon particles in the DPF unit can be burned off completely. Therefore, there will still be a phenomenon of carbon deposition in the DPF unit. And as the particulate filter is used for a longer time, the phenomenon of carbon deposition in the DPF unit will become more and more serious, which may lead to the blockage of the DPF unit and is not conducive to exhaust.

[0003] In view of this problem, the traditional method is to disassemble the DPF unit in the particulate filter and perform decarbonization treatment on the DPF unit through a special device. For example, a rotary diesel particulate filter backwashing and cleaning device disclosed in the patent application No. CN201620808351.X. When decarbonizing the DPF unit, the DPF unit is placed below the rotary nozzle, and the carbon particles in the DPF are blown out through the rotary nozzle. Although this can effectively remove the carbon particles in the DPF unit, considering that the installation position of the particulate filter is generally under the vehicle and is connected to the exhaust manifold. When decarbonizing the DPF unit, not only complicated disassembly procedures are required, but also the disassembly and assembly of the particulate filter are likely to cause damage to the connection or misalignment during later installation, resulting in air leakage at the connection, which in turn affects the overall performance of the engine system and is not conducive to the normal operation of the engine. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a diesel particulate filter in view of the deficiencies of the prior art.

[0005] A diesel particulate filter according to the present invention includes a housing and a DPF unit; it further includes a blowing assembly, a driving assembly and an exhaust assembly; the DPF unit is movably installed in the housing, the driving assembly is arranged outside the housing, the driving assembly has a driving end penetrating the housing, and the driving end of the driving assembly is fixedly connected to the DPF unit; the blowing assembly is arranged above the housing, and the air outlet end of the blowing assembly is communicated with the inner cavity of the housing, and the air outlet end of the blowing assembly is located above the DPF unit; the exhaust assembly is arranged on the housing below the DPF unit.

[0006] The drive assembly includes a rotating shaft, a positioning shaft, and a driver; the rotating shaft is rotatably and sealingly installed on the side wall of the housing, one end of the rotating shaft extends into the housing and is fixedly connected to the side wall of the DPF unit, the other end of the rotating shaft extends to the outside of the housing, the driver is arranged outside the housing, and the driving end of the driver is fixedly connected to the rotating shaft; one end of the positioning shaft is fixedly installed in the housing on the opposite side of the rotating shaft, and the other end of the positioning shaft is rotatably connected to the DPF unit.

[0007] The air blowing assembly includes a mounting boss and a high-pressure nozzle; the mounting boss is fixedly arranged above the housing, a mounting hole is formed in the mounting boss, and the high-pressure nozzle is fixedly installed in the mounting hole.

[0008] The emission assembly includes a carbon outlet, a collection bag, and a solenoid valve; the carbon outlet is opened on the housing below the DPF unit, a solenoid valve is installed in the carbon outlet, the collection bag is installed below the carbon outlet and is communicated with the carbon outlet.

[0009] A check valve is also installed in the carbon outlet.

[0010] An air guiding hopper communicated with the carbon outlet is arranged in the housing above the carbon outlet.

[0011] The housing is composed of a segmented first housing section, a second housing section, and a third housing section; the second housing section is installed between the first housing section and the third housing section, and the second housing section is respectively communicated with the first housing section and the third housing section; an air inlet joint is arranged at one end of the first housing section away from the second housing section, an air outlet joint is arranged at one end of the third housing section away from the second housing section, and the DPF unit is arranged in the second housing section.

[0012] An installation cavity is arranged in the second housing section, and the diameter of the installation cavity is greater than or equal to the length of the diagonal line of the axial section of the DPF unit; air guiding structures are arranged on both sides of the installation cavity.

[0013] The air guiding structure is composed of an air guiding ring and a guiding arc surface arranged on the air guiding ring; the air guiding ring is arranged at the edge of the installation cavity, and the air guiding ring and the second housing section are of an integral structure; a guiding arc surface is arranged on one side of the air guiding ring close to the installation cavity, and the corners of the DPF unit are in contact with the guiding arc surface.

[0014] A plurality of installation ears of an integral structure with the second housing section are arranged on both sides of the second housing section, through holes are formed in the installation ears; a plurality of threaded holes corresponding to the through holes of the installation ears one by one are formed at the edge of one end of the first housing section and the third housing section close to the second housing section; bolts are inserted into the through holes, and the bolts are threadedly connected with the threaded holes.

[0015] Beneficial effects

[0016] The advantages of the present invention are as follows: The DPF unit is movably installed in the housing and driven by a drive assembly. When decarbonizing the DPF unit, the axial direction of the DPF unit faces the air blowing assembly and the exhaust assembly. Compressed gas output by the air blowing assembly is used to blow carbon particles in the DPF unit, and then the carbon particles are discharged from the particulate trap through the exhaust assembly, realizing decarbonization treatment of the DPF unit without disassembling it. Compared with the prior art, the maintenance of the DPF unit is more convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the particulate trap of the present invention;

[0018] Figure 2 is a top view structural schematic diagram of the particulate trap of the present invention;

[0019] Figure 3 is Figure 2 a sectional structural schematic diagram at B-B in

[0020] Figure 4 is Figure 3 an enlarged structural schematic diagram at A in

[0021] Figure 5 is a structural schematic diagram of the interior of the particulate trap of the present invention when the DPF is in a cleaning state.

[0022] Wherein: 1 - housing, 2 - DPF unit, 3 - locking hoop, 4 - rotating shaft, 6 - high-pressure nozzle, 8 - carbon outlet, 9 - air guide hopper, 10 - first housing section, 11 - second housing section, 12 - third housing section, 13 - air inlet joint, 14 - air outlet joint, 15 - installation cavity, 16 - air guide ring, 18 - guiding arc surface, 20 - installation ear, 21 - bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following describes the present invention in further detail in conjunction with embodiments, but does not constitute any limitation to the present invention. Any limited modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0024] Referring to Figures 1-5 , a diesel particulate trap of the present invention includes a housing 1, a DPF unit 2, an air blowing assembly, a drive assembly, and an exhaust assembly. Among them, the DPF unit 2 has a cylindrical structure; the air blowing assembly is used to connect with an external air source and convey compressed gas into the housing 1; the drive assembly is used to drive the DPF unit 2 to rotate; the exhaust assembly is used to discharge the carbon particles blown out from the DPF unit 2 from the housing 1 and collect these carbon particles.

[0025] The housing 1 of this embodiment is composed of a segmented first housing section 10, a second housing section 11, and a third housing section 12. The second housing section 11 is installed between the first housing section 10 and the third housing section 12, and the second housing section 11 is respectively communicated with the first housing section 10 and the third housing section 12. Pressure sensors are installed in both the first housing section 10 and the third housing section 12 for monitoring the air pressure difference on both sides of the DPF unit 2. The carbon loading situation in the DPF unit 2 can be judged through the air pressure difference. The pressure sensors are electrically connected to the ECU.

[0026] The specific connection method of the three housing sections is that a plurality of mounting ears 20 integrally formed with it are provided on both sides of the second housing section 11, and through holes are provided in the mounting ears 20. A plurality of threaded holes corresponding one by one to the through holes of the mounting ears 20 are provided at the edge of one end of the first housing section 10 and the third housing section 12 close to the second housing section 11. Bolts 21 are inserted into the through holes, and the bolts 21 are threadedly connected to the threaded holes.

[0027] In addition, to ensure the reliability of the connection between the housing sections, a locking hoop 3 is installed outside the connection of the housing sections.

[0028] An air inlet joint 13 is provided at one end of the first housing section 10 away from the second housing section 11, and an air outlet joint 14 is provided at one end of the third housing section 12 away from the second housing section 11. An installation cavity 15 is provided in the second housing section 11, and the DPF unit 2 is rotatably arranged in the installation cavity 15. The use of the segmented housing 1 facilitates the maintenance and replacement of the DPF unit 2, and also facilitates the installation and repair of the blowing assembly, the driving assembly, and the emission assembly.

[0029] To enable the DPF unit 2 to rotate in the second housing section 11 after installation, the diameter of the installation cavity 15 of this embodiment is greater than or equal to the length of the diagonal of the axial section of the DPF unit 2. That is, the diameter of the installation cavity 15 is greater than or equal to the diameter of the trajectory circle formed when the DPF unit 2 rotates, avoiding the problem of interference between the DPF unit 2 and the housing 1 during the rotation process.

[0030] To enable the exhaust gas to effectively enter the DPF unit 2, the present invention is provided with air guiding structures on both sides of the installation cavity 15.

[0031] Specifically, the air guiding structure is composed of an air guiding ring 16 and a guiding arc surface 18 provided on the air guiding ring 16. The air guiding ring 16 is arranged at the edge of the installation cavity 15, and the air guiding ring 16 and the second shell segment 11 are of an integral structure. A guiding arc surface 18 is provided on the side of the air guiding ring 16 close to the installation cavity 15. When the DPF unit 2 is in normal use, the corners of the DPF unit 2 are in contact with the guiding arc surface 18. And the arc track of the guiding arc surface 18 coincides with the track formed by the diagonal line of the axial section of the DPF unit 2 rotating along the center point of the DPF unit 2. That is, when the DPF unit 2 rotates within the range of the guiding arc surface 18, the corresponding corners of the DPF unit 2 and the guiding arc surface 18 are always in contact with the guiding arc surface 18. Such a setting can effectively reduce the air leakage of the exhaust gas and ensure the trapping effect of the DPF unit 2 on the carbon particles in the exhaust gas.

[0032] The drive assembly includes a rotating shaft 4, a positioning shaft, and a driver. The rotating shaft 4 is rotatably and sealingly installed on the side wall of the housing 1. One end of the rotating shaft 4 extends into the second shell segment 11 and is fixedly connected to the side wall of the DPF unit 2. The other end of the rotating shaft 4 extends to the outside of the housing 1. The driver is arranged outside the second shell segment 11, and the driving end of the driver is fixedly connected to the rotating shaft 4. The driver is electrically connected to the ECU. One end of the positioning shaft is fixedly installed in the second shell segment 11 on the opposite side of the rotating shaft 4, and the other end of the positioning shaft is rotatably connected to the DPF unit 2.

[0033] The driver can directly drive the rotating shaft 4 to rotate by using a stepping motor, or can also be realized by the way that the motor drives the rotating shaft 4 to rotate through a coupling. The setting of the positioning shaft is beneficial to the stable rotation of the DPF unit 2 and improves the reliability of the installation of the DPF unit 2.

[0034] The air blowing assembly includes a mounting boss and a high-pressure nozzle 6. The mounting boss is fixedly arranged above the second shell segment 11. A mounting hole is provided in the mounting boss. The high-pressure nozzle 6 is fixedly installed in the mounting hole, and the high-pressure nozzle 6 is located above the DPF unit 2. During use, the high-pressure nozzle 6 needs to be connected to an external air source to send compressed gas into the housing 1. To prevent the exhaust gas flowing through the particulate trap from leaking through the high-pressure nozzle 6, a connecting pipe can be provided at the input end of the high-pressure nozzle 6, and a one-way valve is installed in the connecting pipe. The problem of exhaust gas leakage through the high-pressure nozzle can be avoided through the function of the one-way valve.

[0035] The emission assembly is arranged on the housing 1 below the DPF unit 2. Specifically, the emission assembly includes a carbon outlet 8, a collection bag, and a solenoid valve. The carbon outlet 8 is opened on the housing 1 below the DPF unit 2, and a gas guide hopper 9 communicating with the carbon outlet 8 is provided in the housing 1 above the carbon outlet 8, which is used to guide the compressed gas and the carbon particles falling off from the DPF unit 2 into the carbon outlet 8. A solenoid valve is installed in the carbon outlet 8. When the DPF unit 2 is working normally, the solenoid valve is closed to prevent the waste gas from leaking through the carbon outlet 8. When decarbonizing the DPF unit 2, the solenoid valve is opened. The collection bag is installed below the carbon outlet 8 and communicates with the carbon outlet 8, which is used to collect the carbon particles blown out from the carbon outlet 8.

[0036] Due to the large air pressure and fast air flow speed of the compressed gas, after these gases blow towards the collection bag, it will cause the carbon particles in the collection bag to fly. To prevent the backflow of carbon particles and gas, a check valve is installed in the carbon outlet 8 of the present invention, which can effectively prevent this phenomenon from occurring.

[0037] The working principle of the present invention is as follows: When installing the particulate trap, the intake joint 13 and the exhaust joint 14 at both ends of the housing 1 are respectively connected to the corresponding joints on the exhaust manifold. After installing the particulate trap, reset the DPF unit 2. That is, the axis of the DPF unit 2 is in the same direction and coincides with the axis of the housing 1.

[0038] When the engine is working, after the waste gas enters the particulate trap through the exhaust manifold, the DPF unit 2 will trap the carbon particles in the waste gas to achieve decarbonization of the waste gas. During the working process of the engine, the ECU monitors the pressure difference at both ends of the DPF unit 2 in real time through the pressure sensor. If the pressure difference reaches the set threshold and the engine is in a shutdown state, the ECU will control the driver to work to drive the rotating shaft 4 to rotate. And when the DPF unit 2 rotates until its axis is perpendicular to the axis of the housing 1, the driver stops working. At the same time, the solenoid valve is opened. At this time, the particulate trap is supplied with gas by an external gas source. The compressed gas provided by the external gas source blows towards the DPF unit 2 after passing through the high-pressure nozzle 6. Through the blowing of the compressed gas, the carbon particles in the DPF unit 2 are blown off and fall off. The fallen carbon particles will enter the collection bag through the carbon outlet 8 for collection.

[0039] The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which will not affect the implementation effect of the present invention and the practicality of the patent.

Claims

1. A diesel particulate filter, comprising a housing (1) and a DPF unit (2); characterized in that, It further includes a blowing assembly, a driving assembly and an emission assembly; the DPF unit (2) is movably installed in the housing (1), the driving assembly is arranged on the outer side of the housing (1), the driving assembly is provided with a driving end penetrating through the housing (1), and the driving end of the driving assembly is fixedly connected with the DPF unit (2); the blowing assembly is arranged above the housing (1), and the air outlet end of the blowing assembly is communicated with the inner cavity of the housing (1), and the air outlet end of the blowing assembly is located above the DPF unit (2); the emission assembly is arranged on the housing (1) below the DPF unit (2). The driving assembly includes a rotating shaft (4), a positioning shaft and a driver; the rotating shaft (4) is rotatably and sealingly installed on the side wall of the housing (1), one end of the rotating shaft (4) extends into the housing (1) and is fixedly connected with the side wall of the DPF unit (2), the other end of the rotating shaft (4) extends to the outside of the housing (1), the driver is arranged on the outside of the housing (1), and the driving end of the driver is fixedly connected with the rotating shaft (4); one end of the positioning shaft is fixedly installed in the housing (1) on the opposite side of the rotating shaft (4), and the other end of the positioning shaft is rotatably connected with the DPF unit (2). The blowing assembly includes a mounting boss and a high-pressure nozzle (6); the mounting boss is fixedly arranged above the housing (1), a mounting hole is opened in the mounting boss, and the high-pressure nozzle (6) is fixedly installed in the mounting hole. The emission assembly includes a carbon outlet (8), a collection bag and a solenoid valve; the carbon outlet (8) is opened on the housing (1) below the DPF unit (2), a solenoid valve is installed in the carbon outlet (8), the collection bag is installed below the carbon outlet (8) and is communicated with the carbon outlet (8).

2. The diesel particulate filter according to claim 1, characterized in that, A check valve is also installed in the carbon outlet (8).

3. A diesel particulate filter according to claim 1, characterized in that, A gas guide hopper (9) communicated with the carbon outlet (8) is arranged in the housing (1) above the carbon outlet (8).

4. A diesel particulate filter according to claim 1, characterized in that, The housing (1) is composed of a segmented first housing section (10), a second housing section (11) and a third housing section (12); the second housing section (11) is installed between the first housing section (10) and the third housing section (12), and the second housing section (11) is respectively communicated with the first housing section (10) and the third housing section (12); an air inlet joint (13) is arranged at one end of the first housing section (10) away from the second housing section (11), an air outlet joint (14) is arranged at one end of the third housing section (12) away from the second housing section (11), and the DPF unit (2) is arranged in the second housing section (11).

5. A diesel particulate filter according to claim 4, characterized in that, An installation cavity (15) is arranged in the second housing section (11), the diameter of the installation cavity (15) is greater than or equal to the length of the diagonal line of the axial section of the DPF unit (2); air guide structures are arranged on both sides of the installation cavity (15).

6. The diesel particulate filter according to claim 5, wherein The air guiding structure is composed of an air guiding ring (16) and a guiding arc surface (18) arranged on the air guiding ring (16); the air guiding ring (16) is arranged at the edge of the installation cavity (15), and the air guiding ring (16) and the second shell section (11) are of an integral structure; a guiding arc surface (18) is arranged on one side of the air guiding ring (16) close to the installation cavity (15), and the corners of the DPF unit (2) are in contact with the guiding arc surface (18).

7. A diesel particulate filter according to claim 5, characterized in that, A plurality of mounting ears (20) of an integral structure with the second shell section (11) are arranged on both sides of the second shell section (11), and through holes are formed in the mounting ears (20); a plurality of threaded holes corresponding to the through holes of the mounting ears (20) one by one are formed at the edge of one end of the first shell section (10) and the third shell section (12) close to the second shell section (11); bolts (21) are inserted into the through holes, and the bolts (21) are in threaded connection with the threaded holes.

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