Quick-response oxygen sensor

Abstract

The utility model relates to the technical field of oxygen sensors, in particular to a quick-response oxygen sensor which comprises a sensor body, a zirconium element is arranged in the sensor body, and a protective sleeve is arranged outside one end, close to the zirconium element, of the sensor body. The temperature rising speed can be increased, when an automobile is just started, the temperature of tail gas exhausted by an engine is low, and the oxygen sensor needs to be rapidly heated to the working temperature so that the oxygen concentration in the tail gas can be accurately detected and a signal can be fed back to an ECU in time; the double-heating structure of the spiral heating ring and the heating rod can enable the oxygen sensor to reach the working temperature more quickly, so that the oxygen sensor responds to tail gas quickly, the situation that the working efficiency of a three-way catalyst is low due to slow response of the oxygen sensor at the initial starting stage of an automobile is reduced, the automobile can reach the optimal working state more quickly, and the service life of the automobile is prolonged. The emission of tail gas pollutants is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen sensors, in particular to a fast-response oxygen sensor. Background Art

[0002] An oxygen sensor is an essential component for engines that use a three-way catalytic converter to reduce exhaust pollution. Once the air-fuel ratio of the mixture deviates from the stoichiometric ratio, the three-way catalyst's ability to purify CO, HC, and NOx will drop dramatically. Therefore, an oxygen sensor is installed in the exhaust pipe to detect the oxygen concentration in the exhaust and send a feedback signal to the ECU, which then controls the increase or decrease in fuel injection from the injector to maintain operation near the stoichiometric air-fuel ratio, thereby maintaining the three-way catalytic converter in optimal working condition.

[0003] For example, the oxygen sensor disclosed in authorization announcement number CN201926639U includes a sensing element, a sensor base, and a housing. The housing is connected to the sensor base at one end and to a sealed terminal at the other end, and contains a ceramic body. The sensing element is located within the cavity formed by the sensor base and the housing, with its open end pressed against the ceramic body and its other end sealed. Both its inner and outer surfaces are coated with platinum as electrodes, which contact the signal terminals. By adopting the above technical solution, the utility model has the following beneficial effects: easy installation, simple structure and manufacturing process, low cost, good sealing, waterproofing, and heat dissipation effects, and greatly improved service life.

[0004] Although the above patent has good sealing, waterproof and heat dissipation effects, which can greatly improve the service life, the above structure of internally heating the ceramic body causes the temperature to rise slowly during the initial start of the car, and thus during this process, the oxygen sensor cannot respond quickly to the exhaust gas. Utility Model Content

[0005] The purpose of the present invention is to provide a fast-response oxygen sensor to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A fast-response oxygen sensor comprising

[0008] A sensor body, wherein a zirconium element is disposed inside the sensor body, and a protective sleeve is disposed outside one end of the sensor body close to the zirconium element;

[0009] A first heating mechanism is provided between the protective cover and the zirconium element, and a second heating mechanism is provided between the sensor body and the interior of the zirconium element.

[0010] Preferably, the heating mechanism 1 includes a mounting frame, which is arranged on the inner side and lower side of the protective cover, and a spiral heating coil is arranged between the sensor body and the mounting frame and outside the zirconium element;

[0011] Preferably, the second heating mechanism includes an insulating inner layer, which is provided on the inner wall of the sensor body away from the protective cover. A fixing frame is horizontally provided in the middle of the inner side of the insulating inner layer. A heating rod is sleeved in the middle of the fixing frame. The lower end of the heating rod is sleeved in the middle of the inner side of the zirconium element.

[0012] Preferably, a power connection terminal is provided at the top of the sensor body, and the other end of the power connection terminal is connected to the spiral heating coil and the heating rod through a first wire and a second wire respectively;

[0013] Preferably, a first thread groove is provided on the outer wall of the upper end of the protective sleeve, and the protective sleeve is threadedly connected to the inner wall of the lower end of the sensor body through the first thread groove. A second thread groove is provided on the outer wall of the lower end of the protective sleeve, and a retaining ring is annularly provided on the outer wall of the upper end of the protective sleeve. A nut sleeve is movably connected between the retaining ring and the outside of the protective sleeve, and the inner side of the nut sleeve is threadedly connected to the second thread groove;

[0014] Preferably, a plurality of air holes are provided on the outer wall of the protective sleeve with equal arcs.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This is a fast-response oxygen sensor. This device can speed up the heating speed. When the car is just started, the exhaust temperature discharged by the engine is low. The oxygen sensor needs to quickly heat up to the operating temperature to accurately detect the oxygen concentration in the exhaust gas and promptly feedback the signal to the ECU. The dual heating structure of the spiral heating coil and the heating rod can make the oxygen sensor reach the operating temperature faster, thereby quickly responding to the exhaust gas, reducing the low efficiency of the three-way catalytic converter caused by the slow response of the oxygen sensor in the early stage of the car's startup, helping the car to reach the best working state faster and reduce the emission of exhaust pollutants.

[0017] 2. When removing the protective cover of this fast-response oxygen sensor, first twist the nut cover to remove it from the outside of the lower end of the sensor body, and then twist the protective cover to remove it from the inside of the lower end of the sensor body. The double connection can improve the connection stability and prevent the sensor body and protective cover from falling off due to vehicle vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall main structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the utility model;

[0020] Figure 3 For the utility model Figure 2 A in the middle is an enlarged schematic diagram;

[0021] Figure 4 For the utility model Figure 2 Enlarged schematic diagram of point B in the middle.

[0022] In the figure: 1. Sensor body; 2. Zirconium element; 3. Protective cover; 4. Mounting bracket; 5. Spiral heating coil; 6. Insulating inner layer; 7. Fixing bracket; 8. Heating rod; 9. Power terminal; 10. Wire 1; 11. Wire 2; 12. Thread groove 1; 13. Thread groove 2; 14. Retaining ring; 15. Nut sleeve; 16. Air hole. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] like Figure 1-4 As shown, the utility model provides a technical solution:

[0025] A fast-response oxygen sensor includes a sensor body 1, a zirconium element 2 disposed within the sensor body 1, a protective sleeve 3 disposed externally at one end of the sensor body 1 proximate to the zirconium element 2, a thread groove 12 disposed on the upper outer wall of the protective sleeve 3, the protective sleeve 3 being threadably connected to the lower inner wall of the sensor body 1 via the thread groove 12, a thread groove 2 13 disposed on the lower outer wall of the protective sleeve 3, a retaining ring 14 annularly disposed on the upper outer wall of the protective sleeve 3, a nut sleeve 15 movably connected between the retaining ring 14 and the exterior of the protective sleeve 3, the inner side of the nut sleeve 15 being threadably connected to the thread groove 2 13, and a plurality of air holes 16 provided at equal arcs on the outer wall of the protective sleeve 3;

[0026] In this embodiment, the device can speed up the heating speed. When the car is just started, the exhaust gas discharged by the engine is at a low temperature. The oxygen sensor needs to quickly heat up to the operating temperature to accurately detect the oxygen concentration in the exhaust gas and timely feedback the signal to the ECU. The dual heating structure of the spiral heating coil 5 and the heating rod 8 can make the oxygen sensor reach the operating temperature faster, thereby quickly responding to the exhaust gas, reducing the low efficiency of the three-way catalytic converter caused by the slow response of the oxygen sensor in the initial stage of the car's startup, helping the car to reach the optimal working state faster and reduce the emission of exhaust pollutants.

[0027] like Figure 2 and Figure 4 As shown, a heating mechanism 1 is provided between the protective cover 3 and the zirconium element 2, and the heating mechanism 1 includes a mounting frame 4. The mounting frame 4 is provided on the inner side and lower side of the protective cover 3. A spiral heating coil 5 is provided between the sensor body 1 and the mounting frame 4 and outside the zirconium element 2. A heating mechanism 2 is provided between the sensor body 1 and the inside of the zirconium element 2, and the heating mechanism 2 includes an insulating inner layer 6. The insulating inner layer 6 is provided on the inner wall of the sensor body 1 away from the protective cover 3. A fixing frame 7 is horizontally provided in the middle of the inner side of the insulating inner layer 6. A heating rod 8 is sleeved in the middle of the fixing frame 7. The lower end of the heating rod 8 is sleeved in the middle of the inner side of the zirconium element 2. An electrical terminal 9 is provided at the top of the sensor body 1. The other end of the electrical terminal 9 is connected to the spiral heating coil 5 and the heating rod 8 through a wire 10 and a wire 2 11 respectively.

[0028] In this embodiment, when removing the protective cover 3, first twist the nut cover 15 to remove the nut cover 15 from the outside of the lower end of the sensor body 1, and then twist the protective cover 3 to remove the protective cover 3 from the inside of the lower end of the sensor body 1. The double connection can improve the connection stability and prevent the sensor body 1 and the protective cover 3 from falling off due to car vibration.

[0029] Working principle: The device is provided with an electrical terminal 9 at the top of the sensor body 1, and connects the spiral heating coil 5 and the heating rod 8 through a wire 10 and a wire 2 11. Compared with the oxygen sensor in the prior art that only heats the ceramic body internally, the device can speed up the heating speed. When the car is just started, the exhaust gas temperature discharged by the engine is low. The oxygen sensor needs to quickly heat up to the operating temperature to accurately detect the oxygen concentration in the exhaust gas and timely feedback the signal to the ECU. The dual heating structure of the spiral heating coil 5 and the heating rod 8 can make the oxygen sensor reach the operating temperature faster, thereby quickly responding to the exhaust gas, reducing the low efficiency of the three-way catalytic converter caused by the slow response of the oxygen sensor in the early stage of the car's startup, helping the car to reach the optimal working state faster and reduce the emission of exhaust pollutants; when removing the protective cover 3, first twist the nut cover 15 to remove the nut cover 15 from the outside of the lower end of the sensor body 1, and then twist the protective cover 3 to remove the protective cover 3 from the inside of the lower end of the sensor body 1. The use of double connection can improve the connection stability and prevent the sensor body 1 and the protective cover 3 from falling off due to the vibration of the car.

[0030] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A fast-response oxygen sensor, characterized by: include A sensor body (1), wherein a zirconium element (2) is arranged inside the sensor body (1), and a protective sleeve (3) is arranged outside an end of the sensor body (1) close to the zirconium element (2); A first heating mechanism is provided between the protective sleeve (3) and the zirconium element (2), and a second heating mechanism is provided between the sensor body (1) and the interior of the zirconium element (2).

2. The fast-response oxygen sensor according to claim 1, characterized in that: The heating mechanism 1 includes a mounting frame (4), which is arranged below the inner side of the protective cover (3), and a spiral heating coil (5) is arranged between the sensor body (1) and the mounting frame (4) and outside the zirconium element (2).

3. The fast-response oxygen sensor according to claim 2, characterized in that: The second heating mechanism includes an insulating inner layer (6), which is arranged on the inner wall of the sensor body (1) away from the protective cover (3), and a fixing frame (7) is horizontally arranged in the middle of the inner side of the insulating inner layer (6). A heating rod (8) is sleeved in the middle of the fixing frame (7), and the lower end of the heating rod (8) is sleeved in the middle of the inner side of the zirconium element (2).

4. The fast-response oxygen sensor according to claim 3, characterized in that: An electrical connection terminal (9) is provided at the top end of the sensor body (1), and the other end of the electrical connection terminal (9) is connected to the spiral heating coil (5) and the heating rod (8) via a first wire (10) and a second wire (11), respectively.

5. The fast-response oxygen sensor according to claim 1, characterized in that: A thread groove 1 (12) is provided on the outer wall of the upper end of the protective sleeve (3), and the protective sleeve (3) is threadedly connected to the inner wall of the lower end of the sensor body (1) through the thread groove 1 (12). A thread groove 2 (13) is provided on the outer wall of the lower end of the protective sleeve (3), and a retaining ring (14) is annularly provided on the outer wall of the upper end of the protective sleeve (3). A nut sleeve (15) is movably connected between the retaining ring (14) and the outside of the protective sleeve (3), and the inner side of the nut sleeve (15) is threadedly connected to the thread groove 2 (13).

6. The fast-response oxygen sensor according to claim 1, characterized in that: A plurality of air holes (16) are provided at equal arcs on the outer wall of the protective sleeve (3).

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