TWM618820U - Exhaust device for motorcycle engine - Google Patents

Abstract

The exhaust device of this creative locomotive engine includes: exhaust front pipe, first oxygen sensor, first cone tube, catalytic converter assembly, second cone tube, rectifier tube, second oxygen sensor, Silencer and tail pipe. The first oxygen sensor is arranged on the exhaust front pipe. The front end of the first cone pipe is connected with the outlet end of the exhaust front pipe. The catalytic converter assembly includes a catalytic converter cylinder and at least one catalytic converter. The front end of the cylinder of the catalytic converter communicates with the rear end of the first cone tube. The front end of the second cone tube is communicated with the rear end of the catalytic converter cylinder, and the front end of the rectifier tube is communicated with the rear end of the second cone tube. The muffler includes a muffler front cover connected with the cylinder body of the catalytic converter and a muffler body. The muffler body has a groove with an opening facing downward and a lock seat in the groove. The second oxygen sensor The device is locked on the lock attachment seat, and the tail pipe is inserted through the muffler body. Thereby, when the second oxygen sensor is locked to the locking seat, the opening of the locking seat is arranged downward, so that no water will accumulate, and it is possible to accurately measure whether the exhaust gas in the muffler body complies with the laws and regulations.

Description

Exhaust device of locomotive engine

This creation is about an exhaust device for an engine, especially an exhaust device suitable for locomotive engines.

At present, the catalytic converter installed in the exhaust device of the four-stroke engine is coated with a catalyst on a metal cylinder. The catalyst contains precious metals such as platinum (Pt) and palladium (Pd). The air pollutants produced by the incomplete combustion of the engine, such as carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas, are oxidized into harmless carbon dioxide (CO2) and water (H2O), and the nitrogen oxides in the exhaust gas (NOX) is reduced to harmless nitrogen (N2) and oxygen (O2) through the precious metal rhodium (Rh) contained in the catalyst to purify the air pollutants in the engine exhaust.

In addition, the main purpose of the oxygen sensor (Oxygen Sensor or O2 Sensor) is to control the "air-fuel ratio" of gasoline and oxygen in the engine. The oxygen sensor will automatically detect the oxygen content in the exhaust gas in the exhaust pipe. The content information is sent back to the electronic control unit (ECU: Electronic Control Unit). More oxygen content means that the air-fuel ratio is too lean, and less oxygen content means that the air-fuel ratio is too rich. If the air-fuel ratio is too lean, the electronic control unit will drive more fuel injectors. Inject some oil to enrich the oil and gas. If the air-fuel ratio is too rich, the electronic control unit will control the fuel injection nozzle to make it inject less fuel, so that under the rapid operation and control of the electronic control unit, one can be adjusted quickly The most appropriate air-fuel ratio allows every drop of oil to play the best efficiency and achieve fuel-saving effects. Therefore, by using the obvious difference in oxygen content, the oxygen sensor can be used to determine whether the exhaust gas in the exhaust pipe is too rich or too lean.

Please refer to Figure 1 for a structural diagram of the exhaust device of a conventional locomotive engine. The exhaust device of the locomotive engine includes: an exhaust front pipe 85, a catalytic converter front cover 91, and a catalytic converter The outer cylinder 92 of the catalytic converter connected to the front cover 91, the inner cylinder 93 of the catalytic converter, a first catalytic converter 94, a second catalytic converter 95, and a second catalytic converter The lock attachment 961 behind the converter 95, a first oxygen sensor 86, a second oxygen sensor 96, a catalytic converter rear cover 97 connected to the inner cylinder 93 of the catalytic converter, and A muffler body 98.

As shown in FIG. 1, the exhaust front pipe 85 includes an inlet end 851 and an outlet end 852. The inlet end 851 is connected to an exhaust end 801 of an engine 80, and the first oxygen sensor 86 is fixed on the On the exhaust front pipe 85. In addition, the front cover 91 of the catalytic converter is connected to the outlet end 852, and the muffler body 98 includes a front cover 981 of the muffler connected to the outer cylinder 92 of the catalytic converter. The catalytic converter outer cylinder 92 has a detection hole corresponding to the lock base 961, the catalytic converter inner cylinder 93 has an opening corresponding to the lock base 961, and the second oxygen sensor 96 is locked and installed on the lock seat 961, and a part of the second oxygen-containing sensor 96 penetrates the detection hole of the catalytic converter outer cylinder 92 and the opening of the catalytic converter inner cylinder 93 to Check whether the exhaust gas in the inner cylinder 93 of the catalytic converter after the first catalytic converter 94 and the second catalytic converter 95 meets the requirements of laws and regulations.

For the exhaust device of the conventional locomotive engine, the first oxygen sensor 86 is arranged on the exhaust front pipe 85, and the second oxygen sensor 96 is arranged on the first catalytic converter 94 and the second catalytic converter. The second oxygen-containing sensor 96 is locked on the locking seat 961 of the outer cylinder 92 of the catalytic converter. The opening of the locking seat 961 is arranged upward, which may cause water to accumulate. The signal measured by the second oxygen sensor 96 that is locked on it is poor, and it is impossible to accurately measure whether the exhaust gas complies with the laws and regulations. This is not very ideal, and there is room for improvement.

This is the reason for the creation. Based on the spirit of active invention and creation, he was eager to think of a "exhaust device for locomotive engine" that could solve the above problems. After several research experiments, he finally completed this creation.

The main purpose of this creation is to provide an exhaust device for a locomotive engine. The muffler body has a groove with an opening facing downward, so that when the second oxygen sensor is locked to the locking seat of the groove, the The opening of the seat is also arranged with the groove facing down, so that no water will accumulate, and the second oxygen sensor can accurately measure whether the exhaust gas in the muffler body meets the legal requirements.

In order to achieve the above-mentioned purpose, the exhaust device of the locomotive engine of this creation includes: an exhaust front pipe, a first oxygen sensor, a first cone, a catalytic converter assembly, and a second cone Tube, a rectifier tube, a second oxygen sensor, a muffler and a tail tube. Wherein, the exhaust front pipe includes an inlet end and an outlet end, and the inlet end is communicated with an exhaust end of an engine. The first oxygen sensor is arranged on the exhaust front pipe, and the front end of the first cone pipe is in communication with the outlet end of the exhaust front pipe.

In addition, the catalytic converter assembly includes a catalytic converter cylinder and at least one catalytic converter accommodated in the catalytic converter cylinder, the front end of the catalytic converter cylinder and the rear of the first cone tube端连接。 Connected. The front end of the second cone tube is communicated with the rear end of the catalytic converter cylinder, the front end of the rectifier tube is communicated with the rear end of the second cone tube, and the rectifier tube has a detection hole. The muffler includes a muffler front cover connected to the catalytic converter cylinder and a muffler body. The second cone tube is located in the muffler body. The muffler body has a groove with an opening facing downward and a muffler body The lock attachment seat of the groove and the second oxygen sensor are locked on the lock attachment seat and correspond to the detection hole of the rectifier tube. The tail pipe passes through the muffler body to guide the exhaust gas in the muffler body to be discharged to the outside.

Thereby, when the second oxygen sensor is locked to the lock seat, because the opening of the lock seat is arranged with the groove facing down, no water will accumulate, so that the second oxygen sensor can accurately measure the silencer. Whether the exhaust gas in the body complies with the laws and regulations.

The detection hole of the rectifier tube is within 30 cm from the rear end of the rectifier tube, which can stabilize the current.

The muffler body is provided with a connecting pipe and two partitions. The two partitions divide the muffler body into a first expansion chamber, a second expansion chamber and a third expansion chamber. The rectifier tube is located in the first expansion chamber. Expansion room. As a result, the flow direction of the exhaust gas in the muffler body can be sequentially rectified pipe, first expansion chamber, communication pipe, second expansion chamber, third expansion chamber and tail pipe.

A front catalytic converter can be installed in the exhaust front pipe to increase the purification function of exhaust gas.

A post-catalyst converter can be further contained in the above-mentioned connecting pipe to increase the purification function of exhaust gas.

The above-mentioned rectifier tube can be further equipped with a post-catalyst converter to increase the purification function of the exhaust gas.

The at least one catalytic converter in the above-mentioned catalytic converter cylinder can be one catalytic converter or two catalytic converters.

The above-mentioned catalytic converter assembly further includes a connecting pipe, the front end of the connecting pipe is communicated with the rear end of the first tapered pipe, the connecting pipe covers the catalytic converter cylinder, and the two have a distance to form a heat preservation cavity The room can make the catalytic converter have the characteristics of rapid ignition under cold engine, so the best power performance of the engine can be obtained and the pollution emission can be greatly reduced.

The above summary and the following detailed description are all exemplary in order to further illustrate the scope of patent application of the present invention. The other objectives and advantages of the present invention will be explained in the following descriptions and illustrations.

Please refer to Figures 2 and 3, which are respectively a schematic structural diagram of the exhaust device of a locomotive engine and a schematic cross-sectional structural diagram of a muffler according to the first preferred embodiment of the creation. The exhaust device of the locomotive engine of this embodiment includes: an exhaust front pipe 25, a first oxygen sensor 26, a first cone tube 27, a catalyst converter assembly 30, and a second cone tube 37 , A rectifier tube 38, a second oxygen sensor 36, a muffler 40 and a tail pipe 45.

As shown in FIG. 2, the exhaust front pipe 25 has an inlet end 251 and an outlet end 252, the inlet end 251 is connected to an exhaust end 201 of an engine 20; the first oxygen sensor 26 is arranged in the row On the air front pipe 25, the front end of the first cone pipe 27 is connected to the outlet end 252 of the exhaust front pipe 25; the catalytic converter assembly 30 includes a catalytic converter cylinder 31, a connecting pipe 32 and two accommodating The catalytic converter 34, 35 in the catalytic converter cylinder 31, the front end of the catalytic converter cylinder 31 communicates with the rear end of the first cone tube 27, and the front end of the connecting tube 32 is behind the first cone tube 27 The connecting pipe 32 covers the catalytic converter cylinder 31, and the connecting pipe 32 and the catalytic converter cylinder 31 have a distance to form a heat preservation chamber, which can enable the two catalytic converters 34, 35 When the engine 20 is cold, it has the characteristics of rapid ignition. Therefore, the engine 20 can obtain the best power performance and greatly reduce the pollution emission.

In addition, the front end of the second cone tube 37 communicates with the rear end of the catalytic converter cylinder 31; the front end of the rectifier tube 38 communicates with the rear end of the second cone tube 37, and the rectifier tube 38 has a detection hole 381. The muffler 40 has a muffler front cover 41 connected with the catalytic converter cylinder 31 and a muffler body 42. The second cone 37 is located in the muffler body 42 and the muffler body 42 has an opening facing The lower groove 43 and a locking seat 44 located in the groove 43, the second oxygen sensor 36 is locked on the locking seat 44 and corresponds to the detection hole 381, that is, the second oxygen sensor The 36 system measures the oxygen content of the exhaust gas in the rectifier tube 38. In this embodiment, the distance between the detection hole 381 of the rectifier tube 38 and the rear end of the rectifier tube 38 is within 30 cm, which has the effect of stabilizing the flow.

In addition, the tail pipe 45 passes through the muffler body 42, and the tail pipe 45 can be used to guide the exhaust gas in the muffler body 42 to be discharged to the outside. In this embodiment, the muffler body 42 is provided with a communicating pipe 46 and two partitions 47, 48. The two partitions 47, 48 divide the muffler body 42 into a first expansion chamber 491 and a second partition. Two expansion chambers 492 and a third expansion chamber 493. The rectifier tube 38 is located in the first expansion chamber 491. Thereby, the flow direction of the exhaust gas in the muffler body 42 is the rectifier pipe 38, the first expansion chamber 491, the communication pipe 46, the second expansion chamber 492, the third expansion chamber 493, and the tail pipe 45 in sequence. Moreover, as shown in FIG. 3, in this embodiment, when the second oxygen-containing sensor 36 is locked to the locking seat 44 on the muffler body 42, it is lower than the center line C of the muffler body 42.

Therefore, the exhaust device of the locomotive engine of this embodiment utilizes the muffler body 42 having a groove 43 with an opening facing downward, so that the second oxygen sensor 36 is locked to the locking seat 44 of the groove 43, because The opening of the locking seat 44 is also arranged downward in accordance with the groove 43, so that no water will accumulate, and the second oxygen sensor 36 can accurately measure whether the exhaust gas in the muffler body 42 meets the requirements of laws and regulations.

Please refer to FIG. 4 is a schematic diagram of the structure of the exhaust device of the locomotive engine of the second preferred embodiment of this creation. The structure of this embodiment is roughly the same as that of the first embodiment. The only difference lies in the present embodiment in the exhaust front pipe 25 Compared with the first embodiment, a front catalytic converter 28 is contained more inside, so as to increase the purification function of exhaust gas.

Please refer to FIG. 5 which is a schematic structural diagram of the exhaust device of a locomotive engine according to the third preferred embodiment of this creation. The structure of this embodiment is roughly the same as that of the first embodiment. In the first embodiment, a post-catalyst converter 391 is provided to increase the purification function of exhaust gas.

Please refer to FIG. 6 which is a schematic structural diagram of the exhaust device of a locomotive engine according to the fourth preferred embodiment of this creation. The structure of this embodiment is roughly the same as that of the first embodiment. In the first embodiment, a back-catalyst converter 392 is provided to increase the purification function of exhaust gas.

Please refer to FIG. 7 which is a schematic diagram of the exhaust device of the locomotive engine according to the fifth preferred embodiment of the present invention. The structure of this embodiment is roughly the same as that of the first embodiment. In the first embodiment, a back-catalyst converter 393 is provided to increase the purification function of exhaust gas.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of rights claimed in this creation should be subject to the scope of the patent application, rather than being limited to the above-mentioned embodiments.

20: Engine 201: exhaust end 25: Exhaust front pipe 251: entry side 252: Exit 26: The first oxygen sensor 27: The first cone 28: Front catalytic converter 30: Catalyst converter assembly 31: Catalytic converter cylinder 32: connecting pipe 34: Catalytic converter 35: Catalytic converter 36: The second oxygen sensor 37: second cone 38: rectifier tube 381: Inspection hole 391: Post-catalyst converter 392: Post-catalyst converter 393: Post-catalyst converter 40: silencer 41: muffler front cover 42: Silencer body 43: Groove 44: lock attached seat 45: tailpipe 46: connecting pipe 461: connecting pipe 47: partition 48: partition 491: first expansion chamber 492: second expansion chamber 493: Third Expansion Chamber 80: Engine 801: exhaust end 85: exhaust duct 851: entry side 852: exit 86: The first oxygen sensor 91: Front cover of catalytic converter 92: Outer cylinder of catalyst converter 93: Inner cylinder of catalyst converter 94: The first catalytic converter 95: The second catalytic converter 96: The second oxygen sensor 961: Lock Attachment 97: Catalytic converter rear cover 98: silencer body 981: Silencer front cover C: Centerline

Fig. 1 is a schematic diagram of the exhaust device of a conventional locomotive engine. Fig. 2 is a structural diagram of the exhaust device of a locomotive engine according to the first preferred embodiment of the invention. Fig. 3 is a schematic cross-sectional structure diagram of the muffler of the exhaust device of the locomotive engine according to the first preferred embodiment of the invention. FIG. 4 is a schematic diagram of the structure of the exhaust device of the locomotive engine according to the second preferred embodiment of the invention. Fig. 5 is a schematic diagram of the exhaust device of the locomotive engine according to the third preferred embodiment of the present invention. Fig. 6 is a schematic structural diagram of the exhaust device of a locomotive engine according to the fourth preferred embodiment of the present invention. Fig. 7 is a structural diagram of the exhaust device of a locomotive engine according to the fifth preferred embodiment of the invention.

20: Engine

201: exhaust end

25: Exhaust front pipe

251: entry side

252: Exit

26: The first oxygen sensor

27: The first cone

30: Catalyst converter assembly

31: Catalytic converter cylinder

32: connecting pipe

34: Catalytic converter

35: Catalytic converter

36: The second oxygen sensor

37: second cone

38: rectifier tube

381: Inspection hole

40: silencer

41: muffler front cover

42: Silencer body

43: Groove

44: lock attached seat

45: tailpipe

46: connecting pipe

47: partition

48: partition

491: first expansion chamber

492: second expansion chamber

493: Third Expansion Chamber

Claims (8)

An exhaust device for a locomotive engine, including: An exhaust front pipe, including an inlet end and an outlet end, the inlet end is connected with an exhaust end of an engine; A first oxygen sensor arranged on the exhaust front pipe; A first cone tube, the front end of which is in communication with the outlet end; A catalytic converter assembly, including a catalytic converter cylinder and at least one catalytic converter accommodated in the catalytic converter cylinder, the front end of the catalytic converter cylinder and the first cone tube Connected at the rear end; A second cone tube, the front end of which is in communication with the rear end of the catalytic converter cylinder; A rectifier tube, the front end of which is in communication with the rear end of the second cone tube, and the rectifier tube has a detection hole; A second oxygen sensor; A muffler includes a muffler front cover connected with the catalytic converter cylinder and a muffler body, the second cone tube is located in the muffler body; wherein the muffler body has an opening facing downward A groove and a locking seat in the groove, the second oxygen sensor is locked on the locking seat and corresponding to the detection hole; and A tail pipe penetrates the muffler body to guide the exhaust gas in the muffler body to be discharged to the outside. The exhaust device of a locomotive engine according to claim 1, wherein the distance between the detection hole and the rear end of the rectifier tube is within 30 cm. The exhaust device of a locomotive engine according to claim 1, wherein the muffler body is provided with a connecting pipe and two partitions, and the two partitions divide the muffler body into a first expansion chamber and a second partition. Two expansion chambers and a third expansion chamber, the rectifier tube is located in the first expansion chamber. The exhaust device of a locomotive engine according to claim 1, wherein the exhaust front pipe is provided with a front catalytic converter. The exhaust device of a locomotive engine according to claim 3, wherein the connecting pipe is provided with a rear catalytic converter. The exhaust device of a locomotive engine according to claim 1, wherein the rectifier tube is provided with a rear catalytic converter. The exhaust device of a locomotive engine according to claim 1, wherein the at least one catalytic converter may be a catalytic converter or a two catalytic converter. The exhaust device of a locomotive engine according to claim 1, wherein the catalytic converter assembly further includes a connecting pipe, the front end of the connecting pipe is communicated with the rear end of the first tapered pipe, and the connecting pipe covers the Catalytic converter cylinder.

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