A diesel engine exhaust purification device

Abstract

The present invention provides a diesel engine exhaust purification device, which relates to the technical field of diesel engine exhaust, and includes: a gas transmission housing, an air inlet pipe and an air outlet pipe, and a storage tank with a catalyst arranged therein; the gas transmission housing is divided into an air inlet area, a air transmission area and an air outlet area, the air inlet area is arranged between the air transmission area and the air outlet area, the air inlet area is connected to the inside of the air transmission area, the air outlet area is connected to the inside of the air outlet pipe, the storage tank is arranged in the gas transmission housing, the two ends of the storage tank are respectively connected to the inside of the air transmission area and the air outlet area, the side wall of the storage tank is arranged directly opposite to the air inlet pipe, the outer side surface of the storage tank is sleeved with a plurality of heat conducting rings along the axial rotation, the heat conducting ring is located in the air inlet area, the outer side surface of the heat conducting ring is fixedly connected with a V-shaped sheet, and the V-shaped sheets on two adjacent heat conducting rings are in opposite directions. The present invention has the function of improving the uniformity of the catalyst being heated and improving the overall preheating effect of the catalyst.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine exhaust gas, and in particular to a diesel engine exhaust gas purification device. Background Art

[0002] A diesel engine exhaust purifier is a device used to purify diesel engine exhaust. Its main function is to convert harmful substances in the exhaust gas emitted by diesel engine into harmless substances. Exhaust catalytic purifiers usually use precious metal catalysts, which are coated on metal honeycomb carriers. The commonly used purifier is a three-way catalytic exhaust purifier. When the high-temperature exhaust gas passes through the purifier, the harmful substances such as hydrocarbons, carbon monoxide and nitrogen oxides react chemically with oxygen under the action of catalysts and high temperature, and are finally converted into non-toxic water and carbon dioxide.

[0003] For example, the Chinese patent with the authorization announcement number CN105240093B, entitled "A diesel exhaust purification device", uses a pre-treatment system to intercept unburned heavy oil droplets, carbonized and sulfided particles, and even extremely viscous asphalt-like substances in the diesel exhaust, so that after the diesel exhaust passes through the pre-treatment device, the exhaust gas forming gaseous pollutants and the gaseous ammonia generated by the gaseous ammonia generation system enter the catalytic reduction reaction system together, and the catalytic reduction reaction system purifies the hydrocarbons, carbon monoxide and nitrogen oxides in the exhaust gas.

[0004] Regarding the above-mentioned related technologies, when the diesel engine starts to deliver exhaust gas to the purification device, when the catalyst contacts the exhaust gas and is heated to a predetermined temperature, the catalyst can catalyze the reaction between the exhaust gas and oxygen. During the heating process, the catalyst does not reach the predetermined temperature and the activity of the catalyst is low, resulting in poor catalytic effect of the catalyst, and then part of the exhaust gas is discharged without being purified, causing negative impact on the environment. Summary of the invention

[0005] In view of this, the present invention provides a diesel engine exhaust purification device, which aims to solve the problem of low exhaust purification efficiency due to the catalyst not reaching a predetermined stable temperature.

[0006] In order to solve the above technical problems, the present invention provides a diesel engine exhaust purification device, comprising an air transmission housing, an air intake pipe and an air outlet pipe, and a storage tank with a catalyst arranged therein; the air transmission housing is divided into an air intake area, an air transmission area and an air outlet area, the air intake area is arranged between the air transmission area and the air outlet area, the air intake area is connected to the inside of the air transmission area, the air outlet area is connected to the inside of the air outlet pipe, the storage tank is arranged in the air transmission housing, the two ends of the storage tank are respectively connected to the inside of the air transmission area and the air outlet area, the arc-shaped side wall of the storage tank is arranged opposite to the air intake pipe, and the outer side surface of the storage tank is axially rotated and sleeved with multiple heat-conducting rings, the heat-conducting rings are all located in the air intake area, and the outer side surfaces of the heat-conducting rings are fixedly connected with V-shaped plates, and the V-shaped plates on every two adjacent heat-conducting rings face oppositely.

[0007] By adopting the above technical solution, the high-temperature exhaust gas heats the side wall of the storage tank through the heating ring, thereby preheating the catalyst, shortening the time for the catalyst to reach the preheating temperature and reducing the amount of unpurified exhaust gas discharged. At the same time, the flowing exhaust gas drives the heat-conducting ring to rotate around the central axis of the storage tank through the V-shaped plate, so that the exhaust gas drives the heat-conducting ring to rotate during the preheating of the catalyst, and the heat from the heat-conducting ring contacting the exhaust gas is transferred to the entire circumferential side wall of the storage tank, which improves the uniformity of the catalyst heating and thus improves the overall preheating effect of the catalyst.

[0008] Optionally, the outer side surface of the storage tank is rotatably connected with an air inlet shell and an air outlet shell, the heat conductive ring is arranged between the air inlet shell and the air outlet shell, the outer side surface of the storage tank is provided with an air delivery groove, the air inlet shell and the air outlet shell are both connected to the inside of the air delivery groove, the air delivery groove is arranged on the inner side of the heat conductive ring, a bracket is fixedly connected to the inside of the air inlet pipe, the bracket is fixedly connected to an air collecting pipe, and the air collecting pipe is connected to the inside of the air inlet shell.

[0009] By adopting the above technical solution, the exhaust gas enters between the heat-conducting ring and the storage tank, driving the smoke particles between the heat-conducting ring and the storage tank to move, reducing the probability of the heat-conducting ring being stuck by the smoke particles. At the same time, the exhaust gas flows between the heat-conducting ring and the storage tank as a medium to reduce the contact friction between the heat-conducting ring and the storage tank. In addition, the exhaust gas between the heat-conducting ring and the storage tank can also preheat the catalyst, and the flowing exhaust gas is conducive to the uniformity of catalyst heating.

[0010] Optionally, one end of the air collection pipe close to the air inlet pipe is fixedly connected to a conical pipe.

[0011] Optionally, a sealing ring is fixedly connected to the outer side surface of the gas transmission housing close to the gas outlet area, and the sealing ring is detachably connected to a closing plate by fastening screws.

[0012] By adopting the above technical solution, the closing plate can be disassembled to clean the inside of the gas delivery housing. Since the tail gas in the gas outlet area has flowed through the storage tank and been purified, the inside of the gas delivery housing can be cleaned without discharging untreated tail gas.

[0013] Optionally, a sealing bevel is provided on a side of the sealing ring away from the gas transmission housing, and a fastening bevel is provided on a side of the closing plate close to the gas transmission housing, and the fastening bevel can abut against the sealing bevel.

[0014] Optionally, the storage tank includes an outer support tube and an inner tank body, the outer support tube is fixedly arranged in the air intake area, the inner tank body is used to store catalyst, the outer support tube is fixedly connected to a first limiting ring at one end close to the gas transmission area, the first limiting ring abuts against the inner tank body, the closing plate is threadedly connected with a connecting screw, the connecting screw is fixedly connected with a fixing ring, and the fixing ring is used to fix the inner tank body in the outer support tube.

[0015] By adopting the above technical solution, when the closing plate is disassembled, the closing plate drives the fixing ring to move out of the gas transmission shell through the connecting screws, and the operator pulls the handle to move the inner tank body out of the outer support cylinder through the slide groove, thereby realizing the replacement of the catalyst and maintaining the catalytic effect on the exhaust gas purification reaction.

[0016] Optionally, the side wall of the gas transmission shell located in the gas outlet area is fixedly connected to a supporting shell, the side wall of the supporting shell is provided with a drainage groove, the supporting shell is slidably connected to a transmission rod, the top wall of the transmission rod is fixedly connected to a buoyancy member, the supporting shell is vertically slidably connected to a water outlet pipe, the side wall of the water outlet pipe is provided with a water outlet groove that can be connected to the drainage groove, the outer side of the water outlet pipe is provided with a fastening groove, the gas transmission shell is horizontally slidably connected to a fastening pin, one end of the fastening pin is engaged with the fastening groove, the end of the fastening pin away from the water outlet pipe abuts against the inner side of the transmission rod, and the outer side of the water outlet pipe is sleeved with a return spring.

[0017] By adopting the above technical solution, when the rainwater is discharged, the buoyancy member moves downward to abut against the inner side of the gas delivery shell, and at the same time the drainage groove is separated from the water delivery groove, the buoyancy member closes the water delivery groove, and the exhaust gas is pressed downward during the discharge process, so that the buoyancy member continues to close the drainage groove, thereby limiting the exhaust gas from being discharged through the drainage groove. In this way, the exhaust gas is prevented from being discharged while the rainwater is discharged, reducing the negative impact of the rainwater on the catalyst cooling and the catalytic effect.

[0018] Optionally, a side wall of the storage tank close to the gas outlet area is fixedly connected to an air pipe, and the air pipe is used to transport the purified exhaust gas to the next workstation for recycling.

[0019] In summary, compared with the prior art, the present invention includes at least one of the following beneficial technical effects:

[0020] 1. The high-temperature exhaust gas heats the side wall of the storage tank through the heating ring, thereby preheating the catalyst, shortening the time for the catalyst to reach the preheating temperature and reducing the amount of unpurified exhaust gas discharged. At the same time, the flowing exhaust gas drives the heat-conducting ring to rotate around the central axis of the storage tank through the V-shaped plate, so that the exhaust gas drives the heat-conducting ring to rotate during the preheating of the catalyst, and the heat from the heat-conducting ring contacting the exhaust gas is transferred to the entire circumferential side wall of the storage tank, which improves the uniformity of the catalyst heating and thus improves the overall preheating effect of the catalyst.

[0021] 2. When the closing plate is disassembled, the closing plate drives the fixing ring to move out of the gas transmission housing through the connecting screws. The operator pulls the handle to move the inner tank out of the outer support cylinder through the slide groove, thereby realizing the replacement of the catalyst and maintaining the catalytic effect on the exhaust gas purification reaction.

[0022] 3. After the rainwater is discharged, the buoyancy member moves downward to contact the inner side of the gas delivery shell, and at the same time, the drainage groove is separated from the water delivery groove, and the buoyancy member closes the water delivery groove. During the exhaust gas discharge process, the buoyancy member is pressed downward, so that the buoyancy member continues to close the drainage groove, thereby limiting the exhaust gas from being discharged through the drainage groove. In this way, the exhaust gas is prevented from being discharged while the rainwater is discharged, reducing the negative impact of the rainwater on the catalyst cooling and catalytic effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the gas transmission housing according to an embodiment of the present invention;

[0025] Figure 3 For the embodiment of the present invention Figure 2 A schematic diagram of the structure from another perspective;

[0026] Figure 4 This is a schematic diagram of the structure of a heat-conducting ring and a V-shaped sheet according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the gas delivery tank according to an embodiment of the present invention;

[0028] Figure 6 An exploded view of an air inlet housing and an air outlet housing according to an embodiment of the present invention;

[0029] Figure 7 An exploded view of a closing plate and a storage tank according to an embodiment of the present invention;

[0030] Figure 8 is a cross-sectional view of a closing plate and a sealing ring according to an embodiment of the present invention;

[0031] Fig. 9 This is a schematic diagram of the structure of the support housing, the transmission rod and the buoyancy member according to an embodiment of the present invention;

[0032] Fig.10 It is a cross-sectional view of the support shell, the transmission rod and the buoyancy member according to an embodiment of the present invention.

[0033] Description of reference numerals: 1. gas delivery housing; 11. air inlet pipe; 111. bracket; 12. air outlet pipe; 13. air inlet area; 14. air delivery area; 15. air outlet area; 16. sealing ring; 161. sealing slope; 17. fastening screw; 18. gas delivery pipe; 2. storage tank; 21. gas delivery groove; 22. outer support cylinder; 221. first limiting ring; 222. handle; 23. inner tank body; 3. heat conduction ring; 31. V-shaped sheet; 32. air inlet housing; 321. air collection pipe; 3 22. conical tube; 33. air outlet shell; 331. air outlet groove; 4. closing plate; 41. fastening slope; 5. connecting screw; 51. fixing ring; 6. supporting shell; 61. drainage groove; 62. transmission rod; 63. buoyancy member; 64. water outlet pipe; 641. water outlet groove; 642. limiting part; 65. fastening groove; 66. fastening pin; 67. reset spring; 68. second limiting ring; 69. third limiting ring; 7. first partition; 8. second partition; 81. vent. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the embodiments of the present invention. Figure 1-Figure 10 , the technical scheme of the embodiment of the present invention is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0035] This embodiment provides a diesel engine exhaust purification device, referring to Figure 1 and Figure 2 A diesel engine exhaust purification device includes a gas transmission housing 1, an air inlet pipe 11 and an air outlet pipe 12, a storage tank 2 with a catalyst disposed therein, and a preheating mechanism. The storage tank 2 is cylindrical, and the preheating mechanism is disposed on the outer side of the storage tank 2. The preheating mechanism uses the exhaust gas to preheat the catalyst in the storage tank 2.

[0036] Reference Figure 2 and Figure 3The first partition 7 and the second partition 8 are vertically fixedly connected to the inner side of the gas transmission housing 1. The first partition 7 and the second partition 8 divide the internal cavity of the gas transmission housing 1 into an air inlet area 13, a gas transmission area 14 and an air outlet area 15. The air inlet area 13 is located between the gas transmission area 14 and the gas outlet area 15. The second partition 8 is provided with a vent hole 81. The air inlet area 13 is connected to the inside of the gas transmission area 14 through the vent hole 81. The air inlet area 13 is connected to the inside of the air inlet pipe 11, and the air outlet area 15 is connected to the inside of the air outlet pipe 12. The storage tank 2 is arranged in the gas transmission housing 1, and the two ends of the storage tank 2 are respectively connected to the inside of the gas transmission area 14 and the gas outlet area 15, and the arc-shaped side wall of the storage tank 2 is arranged opposite to the air inlet pipe 11.

[0037] Reference Figure 2 and Figure 4 The preheating mechanism includes a heat-conducting ring 3 and a V-shaped sheet 31. The heat-conducting ring 3 is rotatably sleeved on the outer side of the storage tank 2, and a plurality of heat-conducting rings 3 are arranged along the axial direction of the storage tank 2. The heat-conducting rings 3 are all located in the air intake area 13, and the sides of every two adjacent heat-conducting rings 3 are abutted, and the arc-shaped outer side of the heat-conducting ring 3 receives the exhaust gas transported by the air intake pipe 11. The V-shaped sheet 31 is fixedly connected to the outer side of the heat-conducting ring 3, and a plurality of V-shaped sheets 31 are arranged along the circumference of the heat-conducting ring 3. The direction of the V-shaped sheet 31 is parallel to the tangent direction of the heat-conducting ring 3, and the V-shaped sheets 31 on every two adjacent heat-conducting rings 3 are in opposite directions.

[0038] The intake pipe 11 receives the exhaust gas generated by the engine and transports the exhaust gas to the intake area 13. The exhaust gas in the intake area 13 enters the gas delivery area 14 through the vent 81. The exhaust gas in the gas delivery area 14 flows to the gas outlet area 15 through the storage tank 2. The catalyst in the storage tank 2 accelerates the rate at which the exhaust gas is purified. The exhaust gas in the gas outlet area 15 is output through the outlet pipe 12.

[0039] The intake pipe 11 transports the exhaust gas to the intake area 13 from the outer side of the heat-conducting ring 3. The high-temperature exhaust gas heats the side wall of the storage tank 2 through the heating ring, thereby preheating the catalyst, shortening the time for the catalyst to reach the preheating temperature and reducing the amount of unpurified exhaust gas discharged. At the same time, the flowing exhaust gas pushes the V-shaped plate 31 to rotate around the central axis of the storage tank 2, and the heat-conducting ring 3 rotates synchronously with the V-shaped plate 31, and the two adjacent heat-conducting rings 3 rotate in opposite directions, so that the exhaust gas drives the heat-conducting ring 3 to rotate during the preheating of the catalyst, and the heat of the heat-conducting ring 3 that contacts the exhaust gas is transmitted to the entire circumferential side wall of the storage tank 2, which improves the uniformity of the catalyst heating, thereby improving the overall preheating effect of the catalyst.

[0040] Reference Figure 2 , Figure 5 and Figure 6The outer side of the storage tank 2 is rotatably connected with an air inlet housing 32 and an air outlet housing 33. The air inlet housing 32 and the air outlet housing 33 are annular. The air inlet housing 32 and the air outlet housing 33 are arranged in the air inlet area 13. The air outlet housing 33 is provided with an air outlet groove 331. The air outlet groove 331 is communicated with the inside of the air inlet area 13. The heat conducting ring 3 is arranged between the air inlet housing 32 and the air outlet housing 33. The inner side of the air inlet pipe 11 is fixedly connected with a bracket 111. The bracket 111 is fixedly connected with an air collecting pipe 321. The exhaust gas in the air inlet pipe 11 can flow into the air collecting pipe 321. The end of the air collecting pipe 321 close to the air inlet pipe 11 is fixedly connected with a tapered pipe 322. The tapered pipe 322 can increase the amount of exhaust gas flowing into the air inlet pipe 11. The end of the air collecting pipe 321 away from the air inlet pipe 11 is communicated with the inside of the air inlet housing 32.

[0041] Reference Figure 2 , Figure 5 and Figure 6 A plurality of gas delivery grooves 21 are provided on the outer side of the storage tank 2, and the gas delivery grooves 21 are arranged along the circumference of the storage tank 2, and each gas delivery groove 21 is opened along the axial direction of the storage tank 2, and the air inlet shell 32 and the air outlet shell 33 are arranged at both ends of the gas delivery groove 21, and the air inlet shell 32 and the air outlet shell 33 are both connected to the gas delivery groove 21, and the gas delivery groove 21 is arranged on the inner side of the heat conductive ring 3.

[0042] Since the heat-conducting ring 3 can rotate around the central axis of the storage tank 2, there is a clearance fit between the heat-conducting ring 3 and the storage tank 2, and there is a gap between the heat-conducting ring 3 and the storage tank 2. Since the exhaust gas contains soot particles, the soot particles enter the gap between the heat-conducting ring 3 and the storage tank 2, which will cause the heat-conducting ring 3 to be stuck in rotation.

[0043] In view of the above-mentioned usage, when the intake pipe 11 delivers exhaust gas to the intake area 13, part of the exhaust gas enters the gas delivery groove 21 through the tapered pipe 322 and the air collection pipe 321, and then the flowing exhaust gas enters the gap between the heat-conducting ring 3 and the storage tank 2, driving the smoke particles between the heat-conducting ring 3 and the storage tank 2 to move, reducing the probability of the heat-conducting ring 3 being stuck by the smoke particles. At the same time, the exhaust gas flows between the heat-conducting ring 3 and the storage tank 2 as a medium to reduce the contact friction between the heat-conducting ring 3 and the storage tank 2. In addition, the exhaust gas between the heat-conducting ring 3 and the storage tank 2 can also preheat the catalyst, and the flowing exhaust gas is conducive to the uniformity of the catalyst heating. The exhaust gas in the gas delivery groove 21 enters the gas outlet housing 33, and the exhaust gas enters the intake area 13 through the gas outlet groove 331.

[0044] Reference Figure 7 and Figure 8The outer side surface of the gas transmission housing 1 near the gas outlet area 15 is fixedly connected with a sealing ring 16, and the sealing ring 16 is detachably connected with the closing plate 4 through a fastening screw 17, so that the closing plate 4 can be removed to clean the inside of the gas transmission housing 1. Since the exhaust gas in the gas outlet area 15 has flowed through the storage tank 2 and been purified, the inside of the gas transmission housing 1 can be cleaned without discharging the untreated exhaust gas. The sealing ring 16 has a sealing bevel 161 on the side away from the gas transmission housing 1, and the closing plate 4 has a fastening bevel 41 on the side close to the gas transmission housing 1. The fastening bevel 41 abuts against the sealing bevel 161 to achieve sealing of the gas transmission housing 1. When the fastening screw 17 presses the fastening bevel 41 against the sealing bevel 161, a gap exists between the sealing ring 16 connected by the fastening screw 17 and the side of the closing plate 4. Thus, the fastening screw 17 is continuously twisted to reduce the gap between the sealing ring 16 and the closing plate 4, thereby increasing the pressing force between the fastening bevel 41 and the sealing bevel 161, and improving the sealing effect of the fastening bevel 41 and the sealing bevel 161 on the inside of the gas transmission housing 1.

[0045] Reference Figure 2 and Figure 7 The storage tank 2 includes an outer support tube 22 and an inner tank body 23. The first baffle 7 and the second baffle 8 are both fixedly connected to the outer support tube 22. The inner tank body 23 is used to store catalysts. The outer support tube 22 is fixedly connected to a first limiting ring 221 at one end close to the gas delivery area 14. The first limiting ring 221 abuts against one end of the inner tank body 23. The closing plate 4 is threadedly connected to a connecting screw 5, and the connecting screw 5 is fixedly connected to a fixing ring 51. The connecting screw 5 is twisted to drive the connecting screw 5 to drive the first limiting ring 221 to move along the axial direction of the gas delivery housing 1, and the position of the fixing ring 51 relative to the inner tank body 23 is adjusted, so that the first limiting ring 221 fixes the inner tank body 23 in the outer support tube 22. A handle 222 is fixedly connected to the outer side surface of the inner tank body 23 close to the gas outlet area 15.

[0046] When the closing plate 4 is disassembled, the closing plate 4 drives the fixing ring 51 to move out of the gas transmission housing 1 through the connecting screws 5. The operator pulls the handle 222 to move the inner tank body 23 out of the outer support tube 22 through the slide groove, thereby realizing the replacement of the catalyst and maintaining the catalytic effect on the exhaust gas purification reaction.

[0047] Reference Figure 3 , Fig. 9 and Fig.10The side wall of the gas delivery housing 1 located in the gas outlet area 15 is fixedly connected with a drainage mechanism. When it is rainy, rainwater on the road can enter the gas delivery housing 1 through the gas delivery pipe 18. The rainwater contacts the catalyst, which will cool the catalyst and reduce the catalytic efficiency of the catalyst, and at the same time pollute the catalyst. The drainage mechanism is used to drain the rainwater and limit the discharge of exhaust gas at the same time. The drainage mechanism includes a support housing 6, a transmission rod 62, a buoyancy member 63, a water outlet pipe 64, a second limiting ring 68, a fastening pin 66, a third limiting ring 69 and a return spring 67.

[0048] Reference Figure 3 , Fig. 9 and Fig.10 The support shell 6 is fixedly connected to the side wall of the gas transmission shell 1, and the support shell 6 is located in the gas outlet area 15. The side wall of the support shell 6 is provided with a drainage groove 61, and the drainage groove 61 is connected to the gas outlet area 15. The transmission rod 62 is vertically slidably connected to the support shell 6, and the buoyancy member 63 is fixedly connected to the top wall of the transmission rod 62. The buoyancy member 63 moves downward to close the drainage groove 61. The water outlet pipe 64 is vertically slidably connected in the support shell 6, and the side wall of the water outlet pipe 64 is provided with a water outlet groove 641, and the water outlet groove 641 moves downward to communicate with the drainage groove 61. The outer side surface of the water outlet pipe 64 is provided with a limiting portion 642, and the outer side surface of the limiting portion 642 is provided with a fastening groove 65 along the circumferential direction, and the cross section of the fastening groove 65 is semicircular. The fastening pin 66 is horizontally slidably arranged in the support shell 6, one end of the fastening pin 66 is meshed with the fastening groove 65, and the end of the fastening pin 66 away from the water outlet pipe 64 abuts against the inner side surface of the transmission rod 62. The second limiting ring 68 is fixedly sleeved on the upper end of the support shell 6, and the lower bottom surface of the second limiting ring 68 can abut against the upper surface of the buoyancy member 63. The third limiting ring 69 is fixedly connected to the lower end of the inner side surface of the support shell 6, and the third limiting ring 69 is slidably connected to the water outlet pipe 64. The return spring 67 is sleeved on the outer side surface of the water outlet pipe 64, and the return spring 67 is arranged between the limiting portion 642 and the third limiting ring 69.

[0049] When rainwater enters the gas delivery housing 1 through the gas outlet pipe 12, the first partition 7 will limit the flow of rainwater, so that the rainwater is temporarily retained in the gas outlet area 15. The buoyancy of the rainwater moves the buoyancy member 63 upward and away from the drainage groove 61, and the transmission rod 62 moves upward synchronously with the buoyancy member 63, and the transmission rod 62 moves upward and away from the fastening pin 66, thereby allowing the fastening pin 66 to have space to move in the horizontal direction. The buoyancy member 63 moves upward to abut against the lower bottom surface of the second limit ring 68, thereby preventing the transmission rod 62 from moving upward and away from the support housing 6.

[0050] During the process of exhaust gas being output through the exhaust pipe 12 in the exhaust area 15, the exhaust gas flows downward and squeezes the water outlet pipe 64, causing the water outlet pipe 64 to move downward, and the water outlet groove 641 moves downward synchronously with the water outlet pipe 64 and connects with the drainage groove 61, so that rainwater enters the water outlet pipe 64 through the drainage groove 61 and the water outlet groove 641 in turn, thereby achieving the discharge of rainwater in the gas transmission shell 1, and at this time the return spring 67 is compressed.

[0051] When the rainwater is discharged, the buoyancy member 63 moves downward by its own weight to abut against the inner side surface of the gas transmission housing 1, and at the same time, the drainage groove 61 is separated from the water outlet groove 641, and the buoyancy member 63 closes the drainage groove 61. During the exhaust gas discharge process, the buoyancy member 63 is pressed downward, so that the buoyancy member 63 continues to close the drainage groove 61, thereby limiting the exhaust gas from being discharged through the drainage groove 61. In this way, the exhaust gas is prevented from being discharged while the rainwater is discharged, which reduces the negative impact of the rainwater on the catalyst cooling and the catalytic effect, and reduces the amount of the catalyst that is deteriorated by contact with rainwater.

[0052] Reference Figure 1 and Figure 2 The side wall of the storage tank 2 near the gas outlet area 15 is fixedly connected with an air pipe 18, and the air pipe 18 is used to transport the purified exhaust gas to the next workstation in the locomotive for recycling, such as using the exhaust gas to heat the oil tank. At the same time, the air pipe 18 can be connected to the control valve of the next workstation, so as to control whether the exhaust gas can be output through the air pipe 18.

[0053] The implementation principle of a diesel engine exhaust purification device in an embodiment of the present invention is as follows: the intake pipe 11 receives the exhaust gas generated by the engine and transports the exhaust gas to the intake area 13. The intake pipe 11 transports the exhaust gas to the intake area 13 from the outer side of the heat-conducting ring 3 facing the exhaust gas, and the high-temperature exhaust gas heats the side wall of the storage tank 2 through the heating ring, thereby preheating the catalyst. At the same time, the flowing exhaust gas pushes the V-shaped plate 31 to rotate around the central axis of the storage tank 2, and the heat-conducting ring 3 rotates synchronously with the V-shaped plate 31, and the two adjacent heat-conducting rings 3 rotate in opposite directions, so that the exhaust gas drives the heat-conducting ring 3 to rotate during the preheating of the catalyst, and the heat of the heat-conducting ring 3 contacting the exhaust gas is transmitted to the entire circumferential side wall of the storage tank 2. The tail gas in the air inlet area 13 enters the air delivery area 14 through the air vent 81 , and the tail gas in the air delivery area 14 flows to the air outlet area 15 through the storage tank 2 . The catalyst in the storage tank 2 accelerates the rate at which the tail gas is purified, and the tail gas in the air outlet area 15 is output through the air outlet pipe 12 .

[0054] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A diesel engine exhaust purification device, comprising a gas transmission housing, an air inlet pipe, an air outlet pipe, and a storage tank with a catalyst disposed therein, characterized in that: The gas delivery housing is divided into an air inlet area, a gas delivery area and an air outlet area. The air inlet area is arranged between the gas delivery area and the air outlet area. The air inlet area is communicated with the inside of the gas delivery area, and the air outlet area is communicated with the inside of the air outlet pipe. The storage tank is arranged in the gas delivery housing. The two ends of the storage tank are respectively communicated with the inside of the gas delivery area and the air outlet area. The arc-shaped side wall of the storage tank is arranged opposite to the air inlet pipe. The outer side surface of the storage tank is axially rotated and sleeved with a plurality of heat-conducting rings. The heat-conducting rings are all located in the air inlet area. The outer side surface of the heat-conducting ring is fixedly connected with a V-shaped sheet, and the V-shaped sheets on every two adjacent heat-conducting rings face oppositely. The outer side surface of the storage tank is rotatably connected with an air inlet shell and an air outlet shell, the heat conductive ring is arranged between the air inlet shell and the air outlet shell, the outer side surface of the storage tank is provided with an air delivery groove, the air inlet shell and the air outlet shell are both communicated with the inside of the air delivery groove, the air delivery groove is arranged on the inner side of the heat conductive ring, a bracket is fixedly connected with the inside of the air inlet pipe, the bracket is fixedly connected with an air collection pipe, and the air collection pipe is communicated with the inside of the air inlet shell.

2. A diesel engine exhaust purification device according to claim 1, characterized in that: The air receiving pipe is fixedly connected with a conical pipe at one end close to the air inlet pipe.

3. A diesel engine exhaust purification device according to claim 1, characterized in that: A sealing ring is fixedly connected to the outer side surface of the gas transmission housing close to the gas outlet area, and the sealing ring is detachably connected to a closing plate via a fastening screw.

4. A diesel engine exhaust purification device according to claim 3, characterized in that: The side of the sealing ring away from the gas transmission housing is provided with a sealing inclined surface, and the side of the closing plate close to the gas transmission housing is provided with a fastening inclined surface, and the fastening inclined surface can abut against the sealing inclined surface.

5. A diesel engine exhaust purification device according to claim 4, characterized in that: The storage tank includes an outer support tube and an inner tank body, the outer support tube is fixedly arranged in the air intake area, the inner tank body is used to store the catalyst, the outer support tube is fixedly connected to a first limiting ring at one end close to the gas transmission area, the first limiting ring abuts against the inner tank body, the closing plate is threadedly connected with a connecting screw, the connecting screw is fixedly connected with a fixing ring, and the fixing ring is used to fix the inner tank body in the outer support tube.

6. A diesel engine exhaust purification device according to claim 1, characterized in that: The side wall of the gas transmission shell located in the gas outlet area is fixedly connected to a support shell, a drainage groove is provided on the side wall of the support shell, a transmission rod is slidably connected to the support shell, a buoyancy member is fixedly connected to the top wall of the transmission rod, a water outlet pipe is vertically slidably connected to the support shell, a water outlet pipe is provided on the side wall thereof with a water outlet groove which can be communicated with the drainage groove, a fastening groove is provided on the outer side of the water outlet pipe, a fastening pin is horizontally slidably connected to the gas transmission shell, one end of the fastening pin is engaged with the fastening groove, an end of the fastening pin away from the water outlet pipe abuts against the inner side of the transmission rod, and a return spring is sleeved on the outer side of the water outlet pipe.

7. A diesel engine exhaust purification device according to claim 1, characterized in that: The side wall of the storage tank close to the gas outlet area is fixedly connected with an air delivery pipe, and the air delivery pipe is used to transport the purified tail gas to the next workstation for recycling.

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