Heater for tail gas treatment of hybrid electric vehicle

Abstract

A tail gas treatment heater for a hybrid vehicle comprises a cylindrical stainless steel shell, the front side of the shell is sealed, the rear side of the shell is open, an extending part is arranged on the rear portion of the shell in the circumferential direction, the extending part is in a hexagonal prism shape, the extending part and the shell are coaxial, external threads are arranged on the front side, corresponding to the extending part, of the shell, and a heating wire is arranged in an inner cavity of the shell and is in a U shape with a backward opening. The front portion of the heating wire extends to the front end of the shell, the rear portion of the heating wire extends out of the shell to form two first connector lugs, magnesium oxide sleeves are arranged at the positions, corresponding to the front portion and the middle portion of the shell, of the heating wire in a sleeved mode, and an insulation wire sheath is arranged at the position, close to the tail portion of the shell, of the heating wire in a sleeved mode. The front end of the thermocouple probe extends to the position close to the front end of the shell, two outer leads at the rear end of the thermocouple probe extend backwards and exceed the shell to form two second connector lugs, and the rest space in the shell is densely filled with magnesium powder. The tail gas treatment device is simple in structure, high in heating efficiency and accurate in temperature control, and the tail gas treatment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a tail gas treatment heater for a hybrid vehicle. Background Art

[0002] When treating tail gas, hybrid new energy vehicles are significantly different from traditional fuel vehicles. The engine of a hybrid vehicle does not operate continuously. Due to its intermittent operation characteristics, the temperature of the exhaust pipe is unstable (low). Traditional tail gas treatment methods cannot completely treat harmful substances in the tail gas. Now, vehicle manufacturers have adopted various forms to solve this problem, such as improving the catalytic converter, improving temperature control, upgrading the electronic control system, etc. See Chinese patents CN118391158A, CN220015310U, CN117101640A. There is also a method of replacing or supplementing the existing tail gas treatment device by installing an electrically heated tail gas treatment device on the exhaust pipe. This tail gas treatment device contains strontium chloride and ammonia compounds. After heating, the generated ammonia gas is discharged from the storage container of this tail gas treatment device and mixed with the vehicle tail gas in the exhaust pipe. Through sufficient reaction, the CO and NOx in the tail gas undergo a chemical reaction to become harmless tail gas of CO2 and N2, which is released into the air. However, the existing heating method generally uses an electric heating wire for direct heating. This method not only cannot control the temperature and is prone to overheating after continuous power-on, but also affects the service life of the electric heating wire due to the exposure of the electric heating wire during use, and is prone to safety hazards. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a tail gas treatment heater for a hybrid vehicle, which has a simple structure, high heating efficiency, accurate temperature control, and improves the efficiency of tail gas treatment.

[0004] To solve the above technical problem, the utility model provides a tail gas treatment heater for a hybrid vehicle, which includes a cylindrical stainless steel shell with an axial direction from front to back. The front side of the shell is sealed and the rear side is open. A circumferentially extending extension part is provided at the rear of the shell, and the extension part extends radially along the shell and is in the shape of a hexagonal prism. The extension part and the shell are coaxial. An external thread is provided at the circumferentially outer position of the shell corresponding to the front side of the extension part. The diameter of the external thread is larger than the diameter of the shell and smaller than the diameter of the inscribed circle of the hexagonal prism of the extension part. A heating wire is provided in the inner cavity of the shell. The heating wire is in a U shape with an opening facing backward. The front part of the heating wire extends to near the front end of the shell, and the rear part of the heating wire extends beyond the rear end of the shell to form two first connection heads. A magnesium oxide sleeve is sleeved at the positions of the heating wire corresponding to the front and middle regions of the shell. An insulating wire sheath is sleeved near the tail of the shell at the position of the heating wire. A K-type thermocouple probe is also provided in the shell. The front end of the thermocouple probe extends to near the front end of the shell, and the two external leads at the rear end of the thermocouple probe extend backward and beyond the rear end of the shell to form two second connection heads. The remaining space in the shell is densely filled with magnesium powder.

[0005] Preferably, the thermocouple probe wiring is in a U shape with the opening facing backward, and the plane where the U-shaped wiring of the thermocouple probe is located is perpendicular to the plane where the U-shaped heating wire is located.

[0006] For the sake of simplicity, hereinafter, a hybrid vehicle exhaust gas treatment heater described in the present invention is simply referred to as this heater.

[0007] Advantages of this heater: The external thread on the outer shell of this heater can screw this heater onto the exhaust gas treatment device. The extension part serves as the bolt turning end. The K-type thermocouple probe is at the front end of the outer shell. During use, the first terminal is connected to DC380V direct current, and the second terminal is connected to the vehicle-mounted acquisition interface to monitor the temperature in real time (the vehicle ECU controls the temperature of the heating wire to be maintained between 370°C and 385°C). Its structure is simple, the heating efficiency is high, and the temperature control is accurate, improving the efficiency of exhaust gas treatment. Description of the Drawings

[0008] Figure 1 is a schematic structural diagram of this heater.

[0009] Figure 2 is a schematic diagram of the positional relationship between the heating wire and the thermocouple probe in this heater.

[0010] Figure 3 is a schematic cross-sectional view of this heater.

[0011] Figure 4 is Figure 3 a partial enlarged view of part A in Detailed Embodiments

[0012] See Figures 1-4, A hybrid vehicle exhaust gas treatment heater, comprising a cylindrical stainless steel housing 1 with an axis in the front-rear direction. The front side of the housing 1 is sealed and the rear side is open. An extension part 11 extending radially along the housing 1 is provided circumferentially at the rear of the housing 1. The extension part 11 is in the shape of a hexagonal prism and is coaxial with the housing 1. An external thread 12 is provided at the circumferential outer side of the housing 1 corresponding to the front side of the extension part 11. The diameter of the external thread 12 is larger than the diameter of the housing 1 and smaller than the diameter of the inscribed circle of the hexagonal prism of the extension part 11. A heating wire 2 is arranged in the inner cavity of the housing 1. The heating wire 2 is in a U shape with an opening facing backward. The front part of the heating wire 2 extends to near the front end of the housing 1. The rear part of the heating wire 2 extends beyond the rear end of the housing 1 to form two first connection heads 21. A magnesium oxide sleeve 22 is sleeved at the positions of the heating wire 2 corresponding to the front and middle regions of the housing 1. An insulating wire sheath 23 is sleeved near the tail of the housing 1 at the position of the heating wire 2. A K-type thermocouple probe 3 is also arranged in the housing 1. The front end of the thermocouple probe 3 extends to near the front end of the housing 1. Two external leads at the rear end of the thermocouple probe 3 extend backward and beyond the rear end of the housing 1 to form two second connection heads 31. The remaining space in the housing 1 is densely filled with magnesium powder 4.

[0013] The wiring shape of the thermocouple probe 3 is a U shape with an opening facing backward, and the plane where the U shape of the wiring of the thermocouple probe 3 is arranged perpendicular to the plane where the U shape of the heating wire 2 is located.

Claims

1. A hybrid vehicle exhaust gas treatment heater, characterized in that: It includes a cylindrical stainless steel shell with its axis in the front-rear direction. The front side of the shell is sealed and the rear side is open. An extension part extending radially along the shell is provided circumferentially at the rear of the shell. The extension part is in the shape of a hexagonal prism and is coaxial with the shell. External threads are provided at the front side corresponding to the extension part at the circumferential outer position of the shell. The diameter of the external threads is larger than the diameter of the shell and smaller than the diameter of the inscribed circle of the hexagonal prism of the extension part. A heating wire is provided in the inner cavity of the shell. The heating wire is in a U shape with an opening facing backward. The front part of the heating wire extends to near the front end of the shell, and the rear part of the heating wire extends beyond the rear end of the shell to form two first connection heads. A magnesium oxide sleeve is sleeved at the positions of the heating wire corresponding to the front and middle regions of the shell. An insulating wire sheath is sleeved near the tail of the shell at the position of the heating wire. A K-type thermocouple probe is also provided in the shell. The front end of the thermocouple probe extends to near the front end of the shell, and the two external leads at the rear end of the thermocouple probe extend backward and beyond the rear end of the shell to form two second connection heads. The remaining space in the shell is densely filled with magnesium powder.

2. The hybrid vehicle exhaust gas treatment heater according to claim 1, wherein: The wiring shape of the thermocouple probe is a U shape with an opening facing backward, and the plane where the wiring U shape of the thermocouple probe is located is arranged perpendicular to the plane where the U shape of the heating wire is located.

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