An scr selective reduction catalyst

Abstract

The application relates to the field of tail gas treatment, in particular to an SCR (Selective Catalytic Reduction) selective reduction catalyst, which comprises a catalyst body, an air inlet pipe and an air outlet pipe; the catalyst body comprises a shell and three pressurizing main pipes equidistantly arranged on the upper surface of the shell; the lower surfaces of the pressurizing main pipes are equidistantly provided with a plurality of pressurizing auxiliary pipes; the bottom ends of the pressurizing auxiliary pipes are extended to the inside of the shell and fixedly connected with the inner bottom wall of the shell; and the surfaces of the pressurizing auxiliary pipes are equidistantly provided with a plurality of air injection heads; the catalyst body is arranged, compressed high-pressure gas can be conveyed into the pressurizing auxiliary pipes through the pressurizing main pipes by a high-pressure air pump, and is sprayed out through the air injection heads; since the air injection heads are directed towards solid-state catalysts on the mounting frame, the sprayed high-pressure gas contacts the surfaces of the solid-state catalysts, the reaction between the catalysts and the exhaust gas is more sufficient, the catalytic efficiency is effectively improved, and the removal efficiency of nitrogen oxides is improved.

Description

Technical Field

[0001] This application relates to the field of exhaust gas treatment technology, and in particular to an SCR selective reduction catalyst. Background Technology

[0002] Diesel engines are widely used in transportation and construction machinery due to their high torque and fuel economy, but nitrogen oxides in their exhaust are one of the main pollutants. To meet increasingly stringent emission regulations (such as China VI and Euro VI), selective catalytic reduction (SCR) technology has become the mainstream solution.

[0003] Current SCR systems reduce nitrogen oxides to nitrogen and water by injecting urea solution into the exhaust gas under the action of a catalyst. In recent years, the design optimization of SCR catalysts, the development of catalyst materials, and system integration have become research hotspots. However, existing SCR catalysts suffer from low catalytic efficiency, incomplete reaction, and low nitrogen oxide removal efficiency in the process of reducing nitrogen oxide pollutants.

[0004] Therefore, this application provides an SCR selective reduction catalyst. Summary of the Invention

[0005] The purpose of this application is to solve at least one technical problem raised in the background art.

[0006] This application provides an SCR selective reduction catalyst, including a catalyst body, an inlet pipe and an outlet pipe;

[0007] The catalyst body includes an outer shell and three pressurized main pipes equidistantly arranged on the upper surface of the outer shell. A plurality of pressurized secondary pipes are equidistantly arranged on the lower surface of each pressurized main pipe. The bottom ends of each pressurized secondary pipe extend into the interior of the outer shell and are fixedly connected to the inner bottom wall of the outer shell. A plurality of jet nozzles are equidistantly arranged on the surface of each pressurized secondary pipe. The catalyst body also includes three mounting brackets equidistantly fixed inside the outer shell and corresponding to the three pressurized main pipes for mounting the solid catalyst. All three pressurized main pipes are L-shaped, and connecting pipes are provided at their ends. One end of each connecting pipe is connected to an external high-pressure air pump via a flange.

[0008] By adopting the above technical solution, the catalyst can be pre-installed evenly on the mounting frame during actual use. After the exhaust gas enters the shell through the exhaust pipe and the intake pipe, the external high-pressure gas pump can be started to deliver the compressed high-pressure gas to the pressurization auxiliary pipe through the pressurization main pipe and spray it out through the jet nozzle. Since the jet nozzle is facing the solid catalyst on the mounting frame, the sprayed high-pressure gas comes into contact with the surface of the solid catalyst, which can make the reaction between the catalyst and the exhaust gas more complete, effectively improving the catalytic efficiency and thus improving the removal efficiency of nitrogen oxides.

[0009] Preferably, the front of the outer casing has three rectangular openings at equal intervals, and the front of the outer casing has three door frames corresponding to the three rectangular openings. The inner walls of the door frames are hinged with door panels, and the surfaces of the door panels are provided with handles.

[0010] By adopting the above technical solution, it is convenient to install the solid catalyst on the mounting bracket surface inside the shell.

[0011] Preferably, the left and right surfaces of the outer casing are respectively provided with a first mounting hole and a second mounting hole. One end of the air inlet pipe and the air outlet pipe both extend into the interior of the outer casing. The outer surface of the end of the air inlet pipe is fixedly connected to the inner wall of the first mounting hole, and the outer surface of the end of the air outlet pipe is fixedly connected to the inner wall of the second mounting hole. The surfaces of the air inlet pipe and the air outlet pipe are each fixedly provided with four supporting corner plates in a circumferential array, and the side of the supporting corner plates is fixedly connected to the outer surface of the outer casing.

[0012] By adopting the above technical solution, the exhaust gas can be diverted into the interior of the casing through the intake pipe, and the purified exhaust gas can be discharged through the exhaust pipe.

[0013] Preferably, the end of the intake pipe is provided with an exhaust pipe that connects to the exhaust pipe of the diesel engine, and the end of the intake pipe is provided with a connecting mechanism that facilitates the connection and fixation of the exhaust pipe.

[0014] By adopting the above technical solution, the exhaust pipe and the intake pipe can be quickly connected through the connecting mechanism, avoiding the complicated installation method of bolts used in the existing technology.

[0015] Preferably, the connecting mechanism includes an annular connecting seat fixed to the end of the intake pipe, the annular connecting seat having a first annular cavity inside, and the end surface of the annular connecting seat having an annular opening extending into the first annular cavity and slidably connected to the surface of the exhaust pipe, the inner sidewall of the first annular cavity having an annular insertion groove adapted to the end of the exhaust pipe, and the end of the exhaust pipe being inserted and fixed inside the annular insertion groove.

[0016] By adopting the above technical solution, the exhaust pipe can be passed through the annular opening into the interior of the first annular cavity and inserted and fixed in the annular insertion groove on the inner wall of the first annular cavity.

[0017] Preferably, the first annular cavity is provided with a positioning mechanism for positioning the exhaust pipe. The positioning mechanism includes four arc-shaped positioning plates that are slidably arranged in a circumferential array on the inner wall of the first annular cavity. The inner arc surface of the arc-shaped positioning plates is provided with a plurality of arc-shaped positioning protrusions at equal intervals. The outer surface of the end of the exhaust pipe is provided with a plurality of annular positioning grooves that correspond to and are adapted to the plurality of arc-shaped positioning protrusions at equal intervals.

[0018] By adopting the above technical solution, the arc-shaped positioning plate can be moved to gradually approach the surface of the exhaust pipe, and finally the arc-shaped positioning protrusion on the inner arc surface of the arc-shaped positioning plate can be inserted into the annular positioning groove on the exhaust pipe, thereby achieving effective fixation of the exhaust pipe.

[0019] Preferably, the inner wall of the first annular cavity is provided with four rectangular grooves in a circumferential array, corresponding to the four arc-shaped positioning plates. Two symmetrical sliders are slidably arranged on the inner wall of the rectangular grooves. The ends of the two sliders are provided with rotating grooves, and the inner walls of the two rotating grooves are rotatably provided with top rods through a first rotating shaft. The outer arc surface of the arc-shaped positioning plates is symmetrically fixed with two rotating frames. The other ends of the two top rods are rotatably connected to the inner walls of the two rotating frames through a second rotating shaft.

[0020] The inner wall of the first annular cavity is fixed with two first limiting rods corresponding to the arc-shaped positioning plate, and the surface of the arc-shaped positioning plate is provided with two first limiting holes that are slidably connected to the surfaces of the two first limiting rods.

[0021] By adopting the above technical solution, two sliders can move to both sides simultaneously, thereby enabling two push rods to push the arc-shaped positioning plate, which in turn drives the arc-shaped positioning plate to move automatically. Moreover, the first limit rod effectively ensures the stability of the arc-shaped positioning plate during movement.

[0022] Preferably, the annular connecting seat has a second annular cavity inside. The inner wall of the second annular cavity is rotatably arranged with four threaded columns in a circumferential array. A drive motor for driving one of the threaded columns is fixed on the outer surface of the annular connecting seat. A gear plate is fixed on the surface of each of the four threaded columns. An internal gear ring is rotatably arranged on the inner wall of the second annular cavity through a ball bearing. The four gear plates mesh with the internal gear ring. A bidirectional lead screw is fixed at the end of each of the four threaded columns. One end of each of the four bidirectional lead screws extends into the interior of four rectangular slots. The surfaces of the two sliders are threaded holes that are threadedly connected to the outer surface of the bidirectional lead screw.

[0023] By adopting the above technical solution, the rotation of the drive motor can drive the bidirectional lead screw to rotate, and the rotation of the bidirectional lead screw can drive the two sliders to move automatically to both sides or to the middle at the same time.

[0024] Preferably, the first annular cavity is provided with a sealing mechanism, the sealing mechanism including an inflatable airbag ring fixed to the inner wall of the first annular cavity, the inner wall of the exhaust pipe having an annular sealing groove corresponding to the inflatable airbag ring, the sealing mechanism also including an annular inflatable airbag fixed to the inner wall of the second annular cavity, the inner wall of the annular inflatable airbag having two sets of return springs fixed in a circumferential array, and the surface of the annular inflatable airbag having a connecting pipe extending into the interior of the inflatable airbag ring.

[0025] By adopting the above technical solution, the expansion of the airbag ring can allow it to enter the annular sealing groove on the inner wall of the exhaust pipe, thereby achieving effective sealing of the gap between the inner wall of the exhaust pipe and the inner wall of the first annular cavity.

[0026] Preferably, a sliding ring is slidably provided on the inner wall of the second annular cavity, the end of the annular inflatable airbag is fixedly connected to the surface of the sliding ring, the surface of the sliding ring is provided with four threaded holes respectively threaded to the outer surface of four threaded columns, the inner wall of the second annular cavity is fixedly provided with six second limiting rods in a circumferential array, and the surface of the sliding ring is provided with six second limiting holes slidably connected to the surfaces of the six second limiting rods.

[0027] By adopting the above technical solution, the threaded column can be rotated during the rotation of the bidirectional lead screw driven by the drive motor. The rotation of the threaded column can then drive the sliding ring to move automatically, thereby automatically pressurizing the annular inflatable airbag and achieving automatic sealing.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The SCR selective reduction catalyst described in this application, by setting the catalyst body, allows the solid catalyst to be evenly installed on the mounting frame in advance during actual use. After the exhaust gas enters the housing through the exhaust pipe and the intake pipe, the external high-pressure gas pump can be started to deliver the compressed high-pressure gas through the main pressurization pipe to the secondary pressurization pipe and spray it out through the jet nozzle. Since the jet nozzle is facing the solid catalyst on the mounting frame, the sprayed high-pressure gas contacts the surface of the solid catalyst, which can make the reaction between the catalyst and the exhaust gas more complete, effectively improving the catalytic efficiency and thus improving the removal efficiency of nitrogen oxides.

[0030] 2. The SCR selective reduction catalyst described in this application, by setting a connection mechanism, allows the exhaust pipe to be inserted into the first annular cavity on the annular connector through the annular opening and into the annular insertion groove inside the first annular cavity when the catalyst is installed with the exhaust pipe, thereby realizing a quick connection between the exhaust pipe and the intake pipe on the catalyst body.

[0031] 3. The SCR selective reduction catalyst described in this application, by setting a positioning mechanism, can start a drive motor after the exhaust pipe is inserted into the annular insertion groove inside the first annular cavity. The rotation of the drive motor drives the threaded column to rotate, the rotation of the threaded column drives the corresponding toothed disc to rotate, the rotation of one toothed disc drives the inner toothed ring to rotate, the rotation of the inner toothed ring drives the remaining three toothed discs to rotate automatically, thereby driving the four threaded columns to rotate simultaneously. The rotation of the threaded columns drives the bidirectional lead screw to rotate, the rotation of the bidirectional lead screw drives the two sliders to move to both sides simultaneously, thereby enabling the push rod to push the arc-shaped positioning plate inward, so that the arc-shaped positioning protrusion on the inner arc surface of the arc-shaped positioning plate can be locked into the annular positioning groove on the surface of the exhaust pipe, thereby achieving the purpose of effectively positioning the exhaust pipe inside the first annular cavity, effectively ensuring the stability of the exhaust pipe after it is connected to the intake pipe.

[0032] 4. The SCR selective reduction catalyst described in this application, through the setting of a sealing mechanism, effectively fixes the exhaust pipe by rotating four threaded columns simultaneously driven by the rotation of the drive motor. The rotation of the four threaded columns can drive the sliding ring to move to the left. The leftward movement of the sliding ring can automatically compress the annular inflation bladder, allowing the air inside the annular inflation bladder to enter the interior of the expansion bladder ring through the connecting pipe, causing the expansion bladder ring to expand. Thus, the expanded expansion bladder ring can be inserted into the annular sealing groove on the inner wall of the exhaust pipe, effectively sealing the gap between the inner wall of the exhaust pipe and the inner wall of the first annular cavity, thereby effectively preventing exhaust gas leakage during transportation. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of this application;

[0034] Figure 2 This is a top view of the structure of this application;

[0035] Figure 3 This is a schematic diagram of the internal structure of the outer shell in this application;

[0036] Figure 4 This application Figure 3 Enlarged structural diagram at point A in the middle;

[0037] Figure 5 This is a three-dimensional structural diagram of the connection mechanism of this application;

[0038] Figure 6 This is a schematic cross-sectional view of the annular connecting seat of this application;

[0039] Figure 7 This application Figure 6 Enlarged structural diagram at point B;

[0040] Figure 8This is a schematic diagram of the left cross-section of the annular connecting seat of this application;

[0041] Figure 9 This is a right-section structural diagram of the annular connecting seat of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100. Catalyst body; 101. Outer shell; 102. Main pressurization pipe; 103. Secondary pressurization pipe; 104. Injector head; 105. Connecting pipe; 106. Door panel; 107. Mounting bracket;

[0044] 200. Intake pipe;

[0045] 300. Exhaust pipe;

[0046] 400. Exhaust pipe;

[0047] 500. Connecting mechanism; 501. Annular connecting seat; 502. First annular cavity; 503. Annular opening; 504. Annular insertion groove;

[0048] 600. Positioning mechanism; 601. Arc-shaped positioning plate; 602. Arc-shaped positioning protrusion; 603. Annular positioning groove; 604. Slider; 605. Push rod; 606. First limit rod; 607. Second annular cavity; 608. Threaded column; 609. Drive motor; 6010. Gear plate; 6011. Internal gear ring; 6012. Bidirectional lead screw;

[0049] 700, Sealing mechanism; 701, Inflatable airbag ring; 702, Annular sealing groove; 703, Annular inflatable airbag; 704, Return spring; 705, Connecting pipe; 706, Sliding ring; 707, Second limit rod. Detailed Implementation

[0050] The following combination Figures 1 to 9 This application will be described in further detail below.

[0051] Example 1

[0052] Please refer to the following carefully. Figures 1 to 4A selective reduction catalyst (SCR) includes a catalyst body 100, an inlet pipe 200, and an outlet pipe 300. The catalyst body 100 includes a housing 101 and three pressurized main pipes 102 equidistantly arranged on the upper surface of the housing 101. A plurality of pressurized secondary pipes 103 are equidistantly arranged on the lower surface of the pressurized main pipes 102. The bottom ends of the plurality of pressurized secondary pipes 103 extend into the interior of the housing 101 and are fixedly connected to the inner bottom wall of the housing 101. A plurality of jet nozzles 104 are equidistantly arranged on the surface of the pressurized secondary pipes 103. The catalyst body 100 also includes three mounting brackets 107 equidistantly fixed inside the housing 101 and corresponding to the three pressurized main pipes 102 for mounting solid catalysts. The three pressurized main pipes 102 are all L-shaped, and the ends of the three pressurized main pipes 102 are provided with connecting pipes 105. One end of the connecting pipe 105 is connected to an external high-pressure air pump through a flange.

[0053] Please refer to this carefully. Figure 2 , Figure 3 The front of the outer casing 101 has three rectangular openings at equal intervals, and the front of the outer casing 101 has three door frames corresponding to the three rectangular openings. The inner wall of the door frame is hinged with a door panel 106, and the surface of the door panel 106 is provided with a handle.

[0054] Specifically, it facilitates the mounting of solid catalysts onto the surface of the mounting bracket 107 inside the housing 101.

[0055] Please refer to this carefully. Figure 2 , Figure 3 The left and right surfaces of the outer casing 101 are respectively provided with a first mounting hole and a second mounting hole. One end of the air inlet pipe 200 and the air outlet pipe 300 extends into the interior of the outer casing 101. The outer surface of the end of the air inlet pipe 200 is fixedly connected to the inner wall of the first mounting hole, and the outer surface of the end of the air outlet pipe 300 is fixedly connected to the inner wall of the second mounting hole. The surfaces of the air inlet pipe 200 and the air outlet pipe 300 are each fixedly provided with four supporting corner plates in a circumferential array, and the side of the supporting corner plates is fixedly connected to the outer surface of the outer casing 101.

[0056] Specifically, the exhaust gas can be guided into the interior of the outer casing 101 through the intake pipe 200, and the purified exhaust gas can be discharged through the exhaust pipe 300.

[0057] In this embodiment, by setting the catalyst body 100, the solid catalyst can be evenly installed on the mounting frame 107 in advance during actual use. After the exhaust gas enters the housing 101 through the exhaust pipe 400 and the intake pipe 200, the external high-pressure gas pump can be started to deliver the compressed high-pressure gas to the pressurization sub-pipe 103 through the pressurization main pipe 102 and spray it out through the jet nozzle 104. Since the jet nozzle 104 is facing the solid catalyst on the mounting frame 107, the sprayed high-pressure gas contacts the surface of the solid catalyst, which can make the reaction between the catalyst and the exhaust gas more complete, effectively improving the catalytic efficiency and thus improving the removal efficiency of nitrogen oxides.

[0058] In another embodiment of the above-mentioned method, the urea solution is mixed with high-pressure gas and then transported into the outer shell and sprayed out to form a high-pressure airflow. This high-pressure airflow breaks the catalyst into smaller droplets. This fine atomization significantly improves the evaporation rate and the uniformity of mixing with the flue gas. As a carrier medium, compressed air promotes the uniform and rapid diffusion of the atomized urea solution in the high-temperature flue gas, ensuring that it is efficiently transported to the catalyst surface and fully contacts and reacts with nitrogen oxides.

[0059] Example 2

[0060] Based on Example 1, referring to Figures 5 to 9 And unlike Example 1, the following is true:

[0061] Please refer to this carefully. Figure 4 , Figure 5 The intake pipe 200 is provided with an exhaust pipe 400 at its end, which is connected to the exhaust pipe of the diesel engine. The intake pipe 200 is also provided with a connecting mechanism 500 for connecting and fixing the exhaust pipe 400.

[0062] Specifically, the exhaust pipe 400 and the intake pipe 200 can be quickly connected through the connecting mechanism 500, avoiding the complex installation method of bolts used in existing technologies.

[0063] Please refer to this carefully. Figure 6 , Figure 7 The connecting mechanism 500 includes an annular connecting seat 501 fixed to the end of the intake pipe 200. The annular connecting seat 501 has a first annular cavity 502 inside, and the end surface of the annular connecting seat 501 has an annular opening 503 extending into the first annular cavity 502 and slidingly connected to the surface of the exhaust pipe 400. The inner sidewall of the first annular cavity 502 has an annular insertion groove 504 adapted to the end of the exhaust pipe 400, and the end of the exhaust pipe 400 is inserted and fixed inside the annular insertion groove 504.

[0064] Specifically, the exhaust pipe 400 can pass through the annular opening 503 into the interior of the first annular cavity 502 and be inserted into the annular insertion groove 504 fixed on the inner wall of the first annular cavity 502.

[0065] In this embodiment, by setting the connecting mechanism 500, when installing the catalyst and the exhaust pipe 400, the exhaust pipe 400 can be inserted into the first annular cavity 502 on the annular connecting seat 501 through the annular opening 503, and then inserted into the annular insertion groove 504 inside the first annular cavity 502, thereby realizing the rapid connection between the exhaust pipe 400 and the intake pipe 200 on the catalyst body 100.

[0066] Example 3

[0067] Based on Example 2, referring to Figures 5 to 9 And unlike Example 2, the following is true:

[0068] Please refer to this carefully. Figure 6 , Figure 7 The first annular cavity 502 is provided with a positioning mechanism 600 for positioning the exhaust pipe 400. The positioning mechanism 600 includes four arc-shaped positioning plates 601 that are slidably arranged in a circumferential array on the inner wall of the first annular cavity 502. Several arc-shaped positioning protrusions 602 are fixed at equal intervals on the inner arc surface of the arc-shaped positioning plates 601. Several annular positioning grooves 603 are opened at equal intervals on the outer surface of the end of the exhaust pipe 400, which correspond to and are adapted to the several arc-shaped positioning protrusions 602.

[0069] Specifically, by moving the arc-shaped positioning plate 601, the arc-shaped positioning plate 601 can gradually approach the surface of the exhaust pipe 400, and finally the arc-shaped positioning protrusion 602 on the inner arc surface of the arc-shaped positioning plate 601 can be inserted into the annular positioning groove 603 on the exhaust pipe 400, thereby achieving effective fixation of the exhaust pipe 400.

[0070] Please refer to this carefully. Figure 6 , Figure 7 The inner wall of the first annular cavity 502 is provided with four rectangular grooves in a circular array, corresponding to the four arc-shaped positioning plates 601. Two symmetrical sliders 604 are slidably arranged on the inner wall of the rectangular grooves. The ends of the two sliders 604 are provided with rotating grooves, and the inner walls of the two rotating grooves are rotatably provided with push rods 605 through a first rotating shaft. Two rotating frames are symmetrically fixed on the outer arc surface of the arc-shaped positioning plates 601. The other ends of the two push rods 605 are rotatably connected to the inner walls of the two rotating frames through a second rotating shaft. The inner wall of the first annular cavity 502 is provided with two first limiting rods 606 corresponding to the arc-shaped positioning plates 601. The surface of the arc-shaped positioning plates 601 is provided with two first limiting holes that are slidably connected to the surfaces of the two first limiting rods 606.

[0071] Specifically, by moving the two sliders 604 to both sides simultaneously, the two push rods 605 can push the arc-shaped positioning plate 601, thereby driving the arc-shaped positioning plate 601 to move automatically. Moreover, the first limit rod 606 effectively ensures the stability of the arc-shaped positioning plate 601 during movement.

[0072] Please refer to this carefully. Figure 6 , Figure 7 The annular connecting seat 501 has a second annular cavity 607 inside. The inner wall of the second annular cavity 607 is rotatably arranged with four threaded pillars 608 in a circumferential array. The outer surface of the annular connecting seat 501 is fixed with a drive motor 609 for driving one of the threaded pillars 608 to rotate. The surfaces of the four threaded pillars 608 are all fixed with toothed discs 6010. The inner wall of the second annular cavity 607 is rotatably arranged with an internal toothed ring 6011 through a ball bearing. The four toothed discs 6010 mesh with the internal toothed ring 6011. The ends of the four threaded pillars 608 are all fixed with bidirectional lead screws 6012. One end of the four bidirectional lead screws 6012 extends into the interior of the four rectangular slots respectively. The surfaces of the two sliders 604 are all provided with threaded holes that are threadedly connected to the outer surface of the bidirectional lead screws 6012.

[0073] Specifically, the rotation of the drive motor 609 can drive the bidirectional lead screw 6012 to rotate, and the rotation of the bidirectional lead screw 6012 can drive the two sliders 604 to move automatically to both sides or to the middle at the same time.

[0074] In this embodiment, by setting a positioning mechanism 600, after the exhaust pipe 400 is inserted into the annular insertion groove 504 inside the first annular cavity 502, the drive motor 609 can be started. The rotation of the drive motor 609 drives the threaded post 608 to rotate, and the rotation of the threaded post 608 drives the corresponding gear disk 6010 to rotate. The rotation of one gear disk 6010 drives the internal gear ring 6011 to rotate, and the rotation of the internal gear ring 6011 drives the remaining three gear disks 6010 to rotate automatically, thereby driving the four threaded posts 608 to rotate simultaneously. The rotation of the threaded column 608 drives the bidirectional lead screw 6012 to rotate. The rotation of the bidirectional lead screw 6012 drives the two sliders 604 to move to both sides simultaneously. This allows the push rod 605 to push the arc-shaped positioning plate 601 inward, so that the arc-shaped positioning protrusion 602 on the inner arc surface of the arc-shaped positioning plate 601 can be engaged in the annular positioning groove 603 on the surface of the exhaust pipe 400. This achieves the purpose of effectively positioning the exhaust pipe 400 inside the first annular cavity 502, effectively ensuring the stability of the exhaust pipe 400 after it is connected to the intake pipe 200.

[0075] Example 4

[0076] Based on Example 3, referring to Figures 5 to 9 And unlike Example 3, the following is true:

[0077] Please refer to this carefully. Figure 6 , Figure 7 The first annular cavity 502 is provided with a sealing mechanism 700. The sealing mechanism 700 includes an inflatable airbag ring 701 fixed to the inner wall of the first annular cavity 502. The inner wall of the exhaust pipe 400 is provided with an annular sealing groove 702 corresponding to the inflatable airbag ring 701. The sealing mechanism 700 also includes an annular inflatable airbag 703 fixed to the inner wall of the second annular cavity 607. The inner wall of the annular inflatable airbag 703 is provided with two sets of return springs 704 in a circumferential array. The surface of the annular inflatable airbag 703 is provided with a connecting pipe 705 extending into the interior of the inflatable airbag ring 701.

[0078] Specifically, the expansion of the airbag ring 701 allows it to enter the annular sealing groove 702 on the inner wall of the exhaust pipe 400, thereby effectively sealing the gap between the inner wall of the exhaust pipe 400 and the inner wall of the first annular cavity 502.

[0079] Please refer to this carefully. Figure 6 , Figure 7 A sliding ring 706 is slidably disposed on the inner wall of the second annular cavity 607. The end of the annular inflatable airbag 703 is fixedly connected to the surface of the sliding ring 706. The surface of the sliding ring 706 is provided with four threaded holes that are respectively threaded to the outer surfaces of the four threaded posts 608. Six second limiting rods 707 are fixedly disposed in a circumferential array on the inner wall of the second annular cavity 607, and the surface of the sliding ring 706 is provided with six second limiting holes that are slidably connected to the surfaces of the six second limiting rods 707.

[0080] Specifically, during the rotation of the bidirectional lead screw 6012 driven by the drive motor 609, the threaded column 608 is rotated, thereby causing the sliding ring 706 to move automatically through the rotation of the threaded column 608, thus achieving the purpose of automatically pressurizing the annular inflatable airbag 703 and achieving the purpose of automatic sealing.

[0081] In this embodiment, by setting a sealing mechanism 700, during the process of the drive motor 609 rotating to drive the four threaded posts 608 to rotate simultaneously to effectively fix the exhaust pipe 400, the rotation of the four threaded posts 608 can drive the sliding ring 706 to move to the left. The leftward movement of the sliding ring 706 can realize the automatic compression of the annular inflatable airbag 703, so that the air in the annular inflatable airbag 703 can enter the interior of the inflatable airbag ring 701 through the connecting pipe 705, causing the inflatable airbag ring 701 to expand. Thus, the expanded inflatable airbag ring 701 can be inserted into the annular sealing groove 702 on the inner wall of the exhaust pipe 400, realizing the effective sealing of the gap between the inner wall of the exhaust pipe 400 and the inner wall of the first annular cavity 502, thereby effectively preventing the exhaust gas from leaking during the transportation process.

[0082] Working principle:

[0083] In actual use, this catalyst allows for the pre-installation of a uniform solid catalyst on the mounting frame 107. After the exhaust gas enters the housing 101 through the exhaust pipe 400 and the intake pipe 200, an external high-pressure gas pump is activated to deliver compressed high-pressure gas through the main pressurization pipe 102 to the secondary pressurization pipe 103, and then ejects it through the jet nozzle 104. Because the jet nozzle 104 faces the solid catalyst on the mounting frame 107, the ejected high-pressure gas contacts the surface of the solid catalyst, enabling a more complete reaction between the catalyst and the exhaust gas, effectively improving the catalytic efficiency and thus the removal efficiency of nitrogen oxides. Furthermore, during the installation of the catalyst and the exhaust pipe 400, it can... The exhaust pipe 400 is inserted into the first annular cavity 502 on the annular connector 501 through the annular opening 503, and then into the annular insertion groove 504 inside the first annular cavity 502, thereby achieving a quick connection between the exhaust pipe 400 and the intake pipe 200 on the catalytic converter body 100. Simultaneously, after the exhaust pipe 400 is inserted into the annular insertion groove 504 inside the first annular cavity 502, the drive motor 609 can be started. The rotation of the drive motor 609 drives the threaded post 608 to rotate, which in turn drives the corresponding gear disc 6010 to rotate. The rotation of one gear disc 6010 drives the internal gear ring 6011 to rotate, and the rotation of the internal gear ring 6011 drives the remaining gears to rotate. The remaining three geared discs 6010 rotate automatically, thereby driving the four threaded pins 608 to rotate simultaneously. The rotation of the threaded pins 608 drives the bidirectional lead screw 6012 to rotate, and the rotation of the bidirectional lead screw 6012 drives the two sliders 604 to move to both sides simultaneously. This allows the push rod 605 to push the arc-shaped positioning plate 601 inward, so that the arc-shaped positioning protrusion 602 on the inner arc surface of the arc-shaped positioning plate 601 can be engaged in the annular positioning groove 603 on the surface of the exhaust pipe 400. This achieves the purpose of effectively positioning the exhaust pipe 400 inside the first annular cavity 502, effectively ensuring the stability of the exhaust pipe 400 after it is connected to the intake pipe 200. Moreover, the rotation of the drive motor 609 drives the four threaded pins 6010 to rotate. During the process of simultaneously rotating the four threaded columns 608 to effectively fix the exhaust pipe 400, the rotation of the four threaded columns 608 can drive the sliding ring 706 to move to the left. The leftward movement of the sliding ring 706 can automatically compress the annular inflatable airbag 703, allowing the air inside the annular inflatable airbag 703 to enter the interior of the inflatable airbag ring 701 through the connecting pipe 705, causing the inflatable airbag ring 701 to inflate. This allows the inflated inflatable airbag ring 701 to be inserted into the annular sealing groove 702 on the inner wall of the exhaust pipe 400, effectively sealing the gap between the inner wall of the exhaust pipe 400 and the inner wall of the first annular cavity 502, thereby effectively preventing exhaust gas leakage during transportation.

[0084] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An SCR selective reduction catalyst, characterized in that, It includes a catalyst body (100), an intake pipe (200), and an exhaust pipe (300). The catalyst body (100) includes a shell (101) and three pressurized main pipes (102) equidistantly arranged on the upper surface of the shell (101). The lower surface of the pressurized main pipes (102) is provided with a plurality of pressurized secondary pipes (103) equidistantly arranged. The bottom ends of the plurality of pressurized secondary pipes (103) extend into the interior of the shell (101) and are fixedly connected to the inner bottom wall of the shell (101). The surface of the pressurized secondary pipes (103) is provided with a plurality of jet nozzles (104) equidistantly arranged. The catalyst body (100) also includes three mounting brackets (107) equidistantly fixed inside the shell (101) and corresponding to the three pressurized main pipes (102) for mounting solid catalysts. The three pressurized main pipes (102) are all L-shaped, and the ends of the three pressurized main pipes (102) are provided with connecting pipes (105). One end of the connecting pipe (105) is connected to an external high-pressure air pump through a flange. The end of the intake pipe (200) is provided with an exhaust pipe (400) that is connected to the exhaust pipe of the diesel engine, and the end of the intake pipe (200) is provided with a connecting mechanism (500) that facilitates the connection and fixation of the exhaust pipe (400). The connecting mechanism (500) includes an annular connecting seat (501) fixed to the end of the intake pipe (200). The annular connecting seat (501) has a first annular cavity (502) inside, and the end surface of the annular connecting seat (501) has an annular opening (503) extending into the first annular cavity (502) and slidingly connected to the surface of the exhaust pipe (400). The inner sidewall of the first annular cavity (502) has an annular insertion groove (504) adapted to the end of the exhaust pipe (400). The end of the exhaust pipe (400) is inserted and fixed inside the annular insertion groove (504).

2. The SCR selective reduction catalyst according to claim 1, characterized in that, The front of the outer shell (101) has three rectangular openings at equal intervals, and the front of the outer shell (101) is fixed with three door frames corresponding to the three rectangular openings. The inner wall of the door frame is hinged with a door panel (106), and the surface of the door panel (106) is provided with a handle.

3. The SCR selective reduction catalyst according to claim 1, characterized in that, The left and right surfaces of the outer casing (101) are respectively provided with a first mounting hole and a second mounting hole. One end of the air inlet pipe (200) and the air outlet pipe (300) extend into the interior of the outer casing (101). The outer surface of the end of the air inlet pipe (200) is fixedly connected to the inner wall of the first mounting hole, and the outer surface of the end of the air outlet pipe (300) is fixedly connected to the inner wall of the second mounting hole. The surfaces of the air inlet pipe (200) and the air outlet pipe (300) are each fixedly provided with four supporting corner plates in a circumferential array, and the side of the supporting corner plates is fixedly connected to the outer surface of the outer casing (101).

4. The SCR selective reduction catalyst according to claim 3, characterized in that, The first annular cavity (502) is provided with a positioning mechanism (600) for positioning the exhaust pipe (400). The positioning mechanism (600) includes four arc-shaped positioning plates (601) that are slidably arranged in a circumferential array on the inner wall of the first annular cavity (502). The inner arc surface of the arc-shaped positioning plates (601) is provided with a plurality of arc-shaped positioning protrusions (602) at equal intervals. The outer surface of the end of the exhaust pipe (400) is provided with a plurality of annular positioning grooves (603) that correspond to and are adapted to the plurality of arc-shaped positioning protrusions (602).

5. The SCR selective reduction catalyst according to claim 4, characterized in that, The inner wall of the first annular cavity (502) is provided with four rectangular grooves in a circular array corresponding to the four arc-shaped positioning plates (601). Two symmetrical sliders (604) are slidably arranged on the inner wall of the rectangular grooves. The ends of the two sliders (604) are provided with rotating grooves. The inner walls of the two rotating grooves are rotatably provided with top rods (605) through a first rotating shaft. The outer arc surface of the arc-shaped positioning plate (601) is symmetrically fixed with two rotating frames. The other ends of the two top rods (605) are rotatably connected to the inner walls of the two rotating frames through a second rotating shaft. The inner wall of the first annular cavity (502) is fixed with two first limiting rods (606) corresponding to the arc-shaped positioning plate (601), and the surface of the arc-shaped positioning plate (601) is provided with two first limiting holes that are slidably connected to the surfaces of the two first limiting rods (606).

6. The SCR selective reduction catalyst according to claim 5, characterized in that, The annular connecting seat (501) has a second annular cavity (607) inside. The inner wall of the second annular cavity (607) is rotatably arranged with four threaded columns (608) in a circumferential array. The outer surface of the annular connecting seat (501) is fixed with a drive motor (609) for driving one threaded column (608) to rotate. The surfaces of the four threaded columns (608) are all fixed with toothed discs (6010). The inner wall of the second annular cavity (607) is rotatably arranged with an internal toothed ring (6011) through a ball bearing. The four toothed discs (6010) mesh with the internal toothed ring (6011). The ends of the four threaded columns (608) are all fixed with bidirectional lead screws (6012). One end of the four bidirectional lead screws (6012) extends into the interior of the four rectangular slots respectively. The surfaces of the two sliders (604) are all provided with threaded holes that are threadedly connected to the outer surface of the bidirectional lead screws (6012).

7. The SCR selective reduction catalyst according to claim 6, characterized in that, The first annular cavity (502) is provided with a sealing mechanism (700). The sealing mechanism (700) includes an inflatable airbag ring (701) fixed to the inner wall of the first annular cavity (502). The inner wall of the exhaust pipe (400) is provided with an annular sealing groove (702) corresponding to the inflatable airbag ring (701). The sealing mechanism (700) also includes an annular inflatable airbag (703) fixed to the inner wall of the second annular cavity (607). The inner wall of the annular inflatable airbag (703) is provided with two sets of return springs (704) arranged in a circumferential array. The surface of the annular inflatable airbag (703) is provided with a connecting pipe (705) extending into the interior of the inflatable airbag ring (701).

8. The SCR selective reduction catalyst according to claim 7, characterized in that, The inner wall of the second annular cavity (607) is slidably provided with a sliding ring (706). The end of the annular inflatable airbag (703) is fixedly connected to the surface of the sliding ring (706). The surface of the sliding ring (706) is provided with four threaded holes that are respectively threaded to the outer surface of four threaded posts (608). The inner wall of the second annular cavity (607) is fixedly provided with six second limiting rods (707) in a circumferential array. The surface of the sliding ring (706) is provided with six second limiting holes that are slidably connected to the surfaces of the six second limiting rods (707).

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