A nitrogen oxygen sensor for air intake protection

Abstract

The present invention discloses a nitrogen oxygen sensor for air intake protection, comprising a mounting shell, a fixing block, a fixing plate and a heating rod, wherein a fixing plate is mounted on one side of the mounting shell, a fixing block is fixedly connected to a side wall of the fixing plate close to the mounting shell, a heating rod is fixedly connected to an end of the fixing block away from the fixing plate, a sensor probe for detecting exhaust gas is mounted on an outer wall of the mounting shell away from the fixing plate, and air guide holes are evenly arranged on the surface of the sensor probe. When the present invention is in use, when high-temperature exhaust gas passes through a ceramic tube, it enters the surface of an outer platinum electrode to react, and due to the action of a fixing device and a locking device, an air barrier separates the exhaust gas from the internal platinum electrode, and the internal platinum electrode can only react with the internal air, thereby ensuring that the internal and external oxygen concentrations will not affect each other, ensuring the air tightness of the internal platinum electrode, making the detection more accurate, and enabling the air-fuel ratio of the mixed gas to be controlled near a theoretical value.

Description

Technical Field

[0001] The invention relates to the technical field of nitrogen oxygen sensors, in particular to an intake-protected nitrogen oxygen sensor. Background Art

[0002] The nitrogen oxide sensor is used in engines with three-way catalytic converters to reduce exhaust pollution. Once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the purification ability of the three-way catalyst for CO, HC and NOx will drop sharply. Therefore, a nitrogen oxide sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas and send a feedback signal to the ECU, which then controls the increase or decrease of the injector injection amount, thereby controlling the air-fuel ratio of the mixture near the theoretical value.

[0003] The nitrogen oxide sensors used today generally adopt zirconium oxynitride oxygen sensors, which use the internal and external oxygen concentrations to change the internal and external potential difference to control the engine. However, the existing equipment cannot guarantee that the exhaust gas will not contact the inner platinum electrode when passing through. If there is contact, it will cause inaccurate detection and the air-fuel ratio of the mixture cannot be controlled near the theoretical value.

[0004] To this end, we propose an intake-protected nitrogen oxide sensor. Summary of the invention

[0005] The object of the present invention is to provide a nitrogen oxygen sensor for air intake protection which ensures air tightness and stable operation, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a nitrogen oxygen sensor for intake protection, comprising a mounting shell, a fixing block, a fixing plate and a heating rod, a fixing plate being mounted on one side of the mounting shell, a fixing block being fixedly connected to a side wall of the fixing plate close to the mounting shell, a heating rod being fixedly connected to an end of the fixing block away from the fixing plate, a sensor probe for detecting exhaust gas being mounted on an outer wall of the mounting shell away from the fixing plate, air guide holes being evenly arranged on the surface of the sensor probe, fixing devices for fixing the mounting shell and the fixing plate being symmetrically mounted at the connection between the mounting shell and the fixing plate, and an air isolating device for fixing the sensor probe being mounted on one end of the sensor probe located inside the mounting shell.

[0007] Preferably, the sensor probe comprises a ceramic tube, a gas barrier layer and a platinum electrode, the platinum electrode is installed outside the heating rod, a gas barrier layer is installed between the platinum electrodes, the platinum electrode is wrapped outside with a ceramic tube, and the surface of the ceramic tube is evenly provided with air guide holes.

[0008] Preferably, the fixing plate comprises a bottom plate, air holes and transmission grooves, the bottom plate is installed on the side of the mounting shell away from the sensor probe, the air holes are symmetrically provided on the surface of the bottom plate, and the transmission grooves are evenly provided on the surface of the bottom plate.

[0009] Preferably, the fixing device includes a fixing screw, a first screw groove, a fixing groove, a second screw groove and a fixing bracket, the mounting shell and the top surface of the fixing plate are provided with a fixing groove, the fixing bracket is inserted into the fixing groove, the lower end of the fixing bracket is symmetrically provided with a second screw groove, the second screw groove is meshingly connected with a fixing screw, the mounting shell and the top of the fixing plate are provided with a first screw groove at a position corresponding to the fixing screw, and the fixing screw is meshingly inserted into the first screw groove and the second screw groove.

[0010] Preferably, the air-isolating device comprises an installation groove, a installation plate and a locking device. An installation groove is opened inside the installation shell near the fixed plate. A mounting plate is installed in the installation groove. One end of the platinum electrode is fixedly connected to the side wall of the mounting plate. An air-isolating layer is installed on the surface of the mounting plate between the platinum electrodes. A locking device is installed on the surface of the mounting plate at a position corresponding to the air-isolating layer.

[0011] Preferably, the locking device includes a locking groove, a protruding block, a spring groove, a locking block, a locking screw, a locking spring and a third screw groove, a locking groove is provided on the surface of the air barrier layer close to the mounting plate, a protruding block is fixedly connected to the surface of the mounting plate at a position corresponding to the locking groove, a spring groove is provided inside the protruding block, locking blocks are symmetrically installed at both ends of the spring groove, a locking screw is inserted between the locking blocks, a third screw groove is provided on the mounting plate at a position corresponding to the locking screw, and a locking spring is elastically connected between the locking block and the inner wall of the spring groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] When the present invention is in use, when high-temperature exhaust gas passes through the ceramic tube, it enters the surface of the outer platinum electrode and reacts. Due to the action of the fixing device and the locking device, the gas barrier separates the exhaust gas from the internal platinum electrode, and the internal platinum electrode can only react with the internal air, thereby ensuring that the oxygen concentrations inside and outside will not affect each other, ensuring the air tightness of the internal platinum electrode, making the detection more accurate, and enabling the air-fuel ratio of the mixture to be controlled near the theoretical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the sensor probe of the present invention;

[0016] Figure 3This is a schematic diagram of the fixing plate structure of the present invention;

[0017] Figure 4 It is a schematic diagram of the structure of the fixing device of the present invention;

[0018] Figure 5 It is a schematic diagram of the structure of the gas isolation device of the present invention;

[0019] Figure 6 It is a schematic diagram of the structure of the locking device of the present invention.

[0020] In the figure: 1. Installation shell; 2. Sensor probe; 21. Ceramic tube; 22. Air barrier; 23. Platinum electrode; 3. Fixing block; 4. Fixing plate; 41. Bottom plate; 42. Air vent; 43. Transmission slot; 5. Fixing device; 51. Fixing screw; 52. First screw slot; 53. Fixing slot; 54. Second screw slot; 55. Fixing bracket; 6. Air barrier; 61. Installation slot; 62. Installation plate; 63. Locking device; 631. Locking slot; 632. Protruding block; 633. Spring slot; 634. Locking block; 635. Locking screw; 636. Locking spring; 637. Third screw slot; 7. Air guide hole; 8. Heating rod. DETAILED DESCRIPTION

[0021] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0022] See also Figure 1 The figure shows a nitrogen oxygen sensor for intake protection, comprising a mounting shell 1, a fixing block 3, a fixing plate 4 and a heating rod 8. A fixing plate 4 is mounted on one side of the mounting shell 1, and a fixing block 3 is fixedly connected to a side wall of the fixing plate 4 close to the mounting shell 1, and a heating rod 8 is fixedly connected to an end of the fixing block 3 away from the fixing plate 4. A sensor probe 2 for detecting exhaust gas is mounted on the outer wall of the mounting shell 1 away from the fixing plate 4, and air guide holes 7 are evenly opened on the surface of the sensor probe 2. A fixing device 5 for fixing the mounting shell 1 and the fixing plate 4 is symmetrically mounted at the connection between the mounting shell 1 and the fixing plate 4, and an air isolation device 6 for fixing the sensor probe 2 is mounted on one end of the sensor probe 2 located inside the mounting shell 1.

[0023] After the high-temperature exhaust gas enters the device from the air guide hole 7 on the surface of the sensor probe 2, under the action of the fixing device 5 and the air isolation device 6, the sensor probe 2 generates an electrical signal due to the difference in oxygen concentration inside and outside, and transmits it. When the temperature of the exhaust gas is not enough, the heating rod 8 fixedly connected to the surface of the fixing plate 4 is heated up through the fixing block 3 fixedly connected to it to reach the detection temperature condition.

[0024] See also Figure 2 The sensor probe 2 includes a ceramic tube 21, a gas barrier layer 22 and a platinum electrode 23. The platinum electrode 23 is installed on the outside of the heating rod 8. The gas barrier layer 22 is installed between the platinum electrodes 23. The platinum electrode 23 is wrapped with a ceramic tube 21 outside, and the surface of the ceramic tube 21 is evenly provided with air guide holes 7.

[0025] First, the exhaust gas enters from the air guide holes 7 on the surface of the ceramic tube 21 and contacts the platinum electrode 23 outside the air barrier layer 22, while the platinum electrode 23 inside the air barrier layer 22 contacts the air inside it. Due to the difference in oxygen concentration inside and outside, an electric potential difference is generated between the platinum electrodes 23 inside and outside, thereby generating an electrical signal for transmission. The detection can be completed by only making the exhaust gas contact the platinum electrode 23, which is very quick and convenient.

[0026] See also Figure 3 The fixing plate 4 includes a bottom plate 41, air holes 42 and transmission slots 43. The bottom plate 41 is installed on the side of the mounting housing 1 away from the sensor probe 2. The air holes 42 are symmetrically opened on the surface of the bottom plate 41, and the transmission slots 43 are evenly opened on the surface of the bottom plate 41.

[0027] External air can enter the air barrier layer 22 through the air holes 42, ensuring that the platinum electrode 23 inside the air barrier layer 22 is in contact with the external air, and the generated electrical signal is transmitted from the transmission slot 43 to the outside through the transmission line, which can stably complete the detection work.

[0028] See also Figure 4 The fixing device 5 includes a fixing screw 51, a first screw groove 52, a fixing groove 53, a second screw groove 54 and a fixing frame 55. The top surfaces of the mounting shell 1 and the fixing plate 4 are provided with a fixing groove 53, and the fixing frame 55 is inserted into the fixing groove 53. The lower end of the fixing frame 55 is symmetrically provided with a second screw groove 54, and the fixing screw 51 is meshed and connected inside the second screw groove 54. The mounting shell 1 and the fixing plate 4 are provided with a first screw groove 52 at a position corresponding to the fixing screw 51, and the fixing screw 51 is meshed and inserted with the first screw groove 52 and the second screw groove 54.

[0029] When installing the fixing plate 4, first insert the fixing frame 55 into the fixing groove 53, and then engage and insert the fixing screw 51 into the first screw groove 52 and the second screw groove 54. The installation of the fixing screw 51 can fix the installation shell 1 and the fixing plate 4, and the installation work can be completed simply and conveniently.

[0030] See also Figure 5 The air barrier device 6 includes a mounting groove 61, a mounting plate 62 and a locking device 63. The mounting housing 1 is provided with a mounting groove 61 on one side close to the fixing plate 4. The mounting plate 62 is installed in the mounting groove 61. One end of the platinum electrode 23 is fixedly connected to the side wall of the mounting plate 62. The surface of the mounting plate 62 is provided with an air barrier layer 22 between the platinum electrodes 23. The surface of the mounting plate 62 is provided with a locking device 63 at a position corresponding to the air barrier layer 22.

[0031] The air barrier layer 22 is installed on the surface of the mounting plate 62 through the locking device 63, so that the two layers of platinum electrodes 23 are separated so that air cannot circulate on both sides. The mounting plate 62 is installed in the mounting groove 61, which further ensures that air cannot circulate, making the detection more stable and error-free.

[0032] See also Figure 6 The locking device 63 includes a locking groove 631, a protruding block 632, a spring groove 633, a locking block 634, a locking screw 635, a locking spring 636 and a third screw groove 637. The air barrier layer 22 is provided with a locking groove 631 on the surface of the mounting plate 62 on one side thereof. A protruding block 632 is fixedly connected to the surface of the mounting plate 62 at a position corresponding to the locking groove 631. A spring groove 633 is provided inside the protruding block 632. Locking blocks 634 are symmetrically installed at both ends of the spring groove 633. A locking screw 635 is inserted between the locking blocks 634. A third screw groove 637 is provided on the mounting plate 62 at a position corresponding to the locking screw 635. A locking spring 636 is elastically connected between the locking block 634 and the inner wall of the spring groove 633.

[0033] By installing the locking screw 635, the locking block 634 compresses the locking spring 636 and is inserted into the locking groove 631 to complete the locking state, so that the air barrier layer 22 can be in close contact with the mounting plate 62, and the air inside and outside the air barrier layer 22 is isolated, so that the detection will not be affected by the air, thereby ensuring the accuracy of the detection.

[0034] Working principle: by installing the locking screw 635, the locking block 634 compresses the locking spring 636 and is inserted into the locking groove 631 to complete the locking state, so that the air barrier layer 22 can be in close contact with the mounting plate 62, and the air inside and outside the air barrier layer 22 is separated. Then the fixing frame 55 is inserted into the fixing groove 53, and then the fixing screw 51 is engaged and inserted into the first screw groove 52 and the second screw groove 54. Due to the installation of the fixing screw 51, the mounting shell 1 can be fixedly connected to the fixing plate 4, and then the high-temperature exhaust gas enters from the air guide hole 7 on the surface of the ceramic tube 21 and contacts the platinum electrode 23 outside the air barrier layer 22, while the platinum electrode 23 inside the air barrier layer 22 contacts the air inside the air barrier layer 22. Due to the difference in oxygen concentration inside and outside, the platinum electrodes 23 inside and outside generate a potential difference, thereby generating an electrical signal for transmission. When the temperature of the exhaust gas is not enough, the heating rod 8 fixedly connected to it is heated through the fixing block 3 fixedly connected to the surface of the fixing plate 4 to reach the detection temperature condition.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nitrogen oxygen sensor for air intake protection, comprising a mounting shell (1), a fixing block (3), a fixing plate (4) and a heating rod (8), wherein the mounting shell (1) is mounted with a fixing plate (4) on one side, the fixing plate (4) is fixedly connected to a side wall of a side close to the mounting shell (1), and the fixing block (3) is fixedly connected to an end of the fixing block (3) away from the fixing plate (4) with a heating rod (8), characterized in that: A sensor probe (2) for detecting exhaust gas is installed on the outer wall of the installation shell (1) on the side away from the fixing plate (4), and air guide holes (7) are evenly opened on the surface of the sensor probe (2). A fixing device (5) for fixing the installation shell (1) and the fixing plate (4) is symmetrically installed at the connection between the installation shell (1) and the fixing plate (4), and an air isolation device (6) for fixing the sensor probe (2) is installed at one end of the sensor probe (2) located inside the installation shell (1); The sensor probe (2) comprises a ceramic tube (21), a gas barrier layer (22) and a platinum electrode (23); the platinum electrode (23) is installed outside the heating rod (8); a gas barrier layer (22) is installed between the platinum electrodes (23); the ceramic tube (21) is wrapped outside the platinum electrodes (23); and the surface of the ceramic tube (21) is evenly provided with air guide holes (7); The fixing plate (4) comprises a bottom plate (41), air holes (42) and a transmission groove (43); the bottom plate (41) is installed on a side of the mounting housing (1) away from the sensor probe (2); the air holes (42) are symmetrically provided on the surface of the bottom plate (41); and the transmission grooves (43) are evenly provided on the surface of the bottom plate (41); The gas isolation device (6) comprises a mounting groove (61), a mounting plate (62) and a locking device (63); a mounting groove (61) is provided inside the mounting housing (1) on a side close to the fixing plate (4); a mounting plate (62) is installed in the mounting groove (61); one end of the platinum electrode (23) is fixedly connected to a side wall of the mounting plate (62); a gas isolation layer (22) is installed on the surface of the mounting plate (62) between the platinum electrodes (23); and a locking device (63) is installed on the surface of the mounting plate (62) at a position corresponding to the gas isolation layer (22).

2. The nitrogen oxide sensor for air intake protection according to claim 1, characterized in that: The fixing device (5) comprises a fixing screw (51), a first screw groove (52), a fixing groove (53), a second screw groove (54) and a fixing frame (55); the fixing groove (53) is provided on the top surface of the mounting shell (1) and the fixing plate (4); the fixing frame (55) is inserted into the fixing groove (53); the lower end of the fixing frame (55) is symmetrically provided with a second screw groove (54); the fixing screw (51) is meshedly connected inside the second screw groove (54); the first screw groove (52) is provided on the top of the mounting shell (1) and the fixing plate (4) at a position corresponding to the fixing screw (51); and the fixing screw (51) is meshedly inserted into the first screw groove (52) and the second screw groove (54).

3. The nitrogen oxide sensor for air intake protection according to claim 1, characterized in that: The locking device (63) comprises a locking groove (631), a protruding block (632), a spring groove (633), a locking block (634), a locking screw (635), a locking spring (636) and a third screw groove (637); a locking groove (631) is provided on the surface of the air barrier layer (22) close to the mounting plate (62); a protruding block (632) is fixedly connected to the surface of the mounting plate (62) at a position corresponding to the locking groove (631); a spring groove (633) is provided inside the protruding block (632); locking blocks (634) are symmetrically installed at both ends of the spring groove (633); a locking screw (635) is inserted between the locking blocks (634); a third screw groove (637) is provided on the mounting plate (62) at a position corresponding to the locking screw (635); and a locking spring (636) is elastically connected between the locking block (634) and the inner wall of the spring groove (633).

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