Oxygen sensor capable of preventing condensed water

Abstract

The utility model relates to the technical field of oxygen sensors, in particular to a condensed water prevention oxygen sensor which comprises a sensor body, an inner shell is arranged on the inner side of the sensor body, and a detection mechanism is arranged in the inner shell. An outer shell is arranged outside the inner shell, and a moisture absorption mechanism is arranged between the outer shell and the inner shell; a tightening mechanism is arranged between the lower ends of the outer shell and the inner shell, and a positioning mechanism is arranged between the upper ends of the outer shell and the inner shell. In a humid environment, after air containing a large amount of water vapor enters the space, the water vapor is adsorbed by the sponge sleeve, so that the humidity of the air is reduced, and the possibility that the water vapor is condensed into condensed water on the sensing element is reduced.

Description

Technical Field

[0001] This utility model relates to the field of oxygen sensor technology, specifically to an oxygen sensor that prevents condensation. Background Technology

[0002] In engines that use three-way catalytic converters to reduce exhaust pollution, oxygen sensors are essential components. Because the purification capacity of the three-way catalytic converter for CO, HC, and NOx drops sharply once the air-fuel ratio deviates from the stoichiometric ratio, the oxygen sensor is installed in the exhaust pipe to detect the oxygen concentration in the exhaust and send a feedback signal to the ECU. The ECU then controls the amount of fuel injected by the injectors to maintain the fuel injection near the stoichiometric ratio, thus ensuring the three-way catalytic converter operates at its optimal state.

[0003] An oxygen sensor, as disclosed in patent application CN204065009U, includes a base and a housing fitted onto the outer wall of the base. It also includes a sealing liner, a sealing gasket, a sealing block, and a sensing element. The base has a through hole, and the inner wall of the through hole has an annular stepped portion. The sealing liner is press-fitted with the inner wall of the through hole. By adopting the above technical solution, the beneficial effects of this utility model are: it not only has excellent sealing performance but also good structural stability, greatly simplifies the manufacturing process, and reduces production costs.

[0004] Although the aforementioned patent has excellent sealing performance and good structural stability, when the oxygen sensor suddenly enters a low-temperature environment from a high-temperature environment, such as the oxygen sensor in a car, the oxygen sensor is in a high-temperature state when the car engine is running. When the engine stops working, the ambient temperature may drop rapidly. If the gas around the sensor contains water vapor, the water vapor will condense into condensate due to the drop in temperature. Utility Model Content

[0005] The purpose of this invention is to provide an oxygen sensor that prevents condensation, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An oxygen sensor that prevents condensation, including

[0008] The sensor body has an inner shell inside it, and a detection mechanism is located inside the inner shell.

[0009] An outer shell is provided outside the inner shell, and a moisture-absorbing mechanism is provided between the outer shell and the inner shell;

[0010] A tightening mechanism is provided between the lower ends of the outer shell and the inner shell, and a positioning mechanism is provided between the upper ends of the outer shell and the inner shell.

[0011] Preferably, the detection mechanism includes a sensing element, which is disposed in the middle of the inner side of the inner shell, and a wire is disposed in the middle of the top of the sensor body. A heating rod is disposed inside the sensing element, and the heating rod is electrically connected to the wire.

[0012] Preferably, the moisture absorption mechanism includes a rectifier plate, which is arranged in a ring on the inner wall of the inner shell, and a sponge sleeve is fitted on the outer wall of the rectifier plate. The upper end of the rectifier plate has an arc-shaped structure.

[0013] Preferably, the upper outer wall of the inner shell is provided with a plurality of perforations at equal arcs, and the lower outer wall of the outer shell is provided with a plurality of air holes at equal arcs.

[0014] Preferably, the tightening mechanism includes an external thread, an external thread is provided at the bottom outer wall of the inner shell, and a movable sleeve is movably installed on the lower outer side of the inner shell, the movable sleeve being threadedly connected to the external thread;

[0015] Preferably, the positioning mechanism includes a threaded head, which is provided on the upper outer side of the sensor body, and a plurality of positioning grooves are provided at the bottom end of the threaded head. A positioning block matching the positioning grooves is provided on the upper outer wall of the housing.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This oxygen sensor is designed to prevent condensation. In a humid environment, when air containing a large amount of water vapor enters the space, the water vapor is absorbed by the sponge sleeve, thereby reducing the humidity of the air and reducing the possibility of water vapor condensing into condensate on the sensing element.

[0018] 2. In this oxygen sensor with anti-condensation mechanism, the external thread of the tightening mechanism is located on the bottom outer wall of the inner shell, and the movable sleeve is threadedly connected to the external thread. When the movable sleeve is tightened, it will tighten the lower end of the outer shell and the inner shell. The threaded head of the positioning mechanism is located on the upper outer side of the sensor body, and the bottom end of the threaded head is provided with several positioning grooves. The upper outer wall of the outer shell is provided with positioning blocks that match the positioning grooves, which makes disassembly and assembly more convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall main structure of this utility model;

[0020] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0021] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 For the present utility model Figure 2 Enlarged diagram of point B in the middle.

[0023] In the diagram: 1. Sensor body; 2. Inner shell; 3. Outer shell; 4. Sensing element; 5. Wire; 6. Heating rod; 7. Rectifier plate; 8. Sponge sleeve; 9. Perforation; 10. Air hole; 11. External thread; 12. Movable sleeve; 13. Threaded head; 14. Positioning groove; 15. Positioning block. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1-4 As shown, this utility model provides a technical solution:

[0026] An oxygen sensor with anti-condensation properties includes a sensor body 1, an inner shell 2 inside the sensor body 1, a detection mechanism inside the inner shell 2, the detection mechanism including a sensing element 4, the sensing element 4 being located in the middle of the inner side of the inner shell 2, a wire 5 being located in the middle of the top of the sensor body 1, a heating rod 6 being located inside the sensing element 4, the heating rod 6 being electrically connected to the wire 5, an outer shell 3 being located outside the inner shell 2, and a moisture absorption mechanism being located between the outer shell 3 and the inner shell 2, the moisture absorption mechanism including a rectifier plate 7, the rectifier plate 7 being annularly arranged on the inner wall of the inner shell 2, a sponge sleeve 8 being sleeved on the outer wall of the rectifier plate 7, the upper end of the rectifier plate 7 having an arc-shaped structure, a number of perforations 9 being arranged at the same arc on the upper outer wall of the inner shell 2, and a number of air holes 10 being arranged at the same arc on the lower outer wall of the outer shell 3.

[0027] In this embodiment, in a humid environment, when air containing a large amount of water vapor enters the space, the water vapor will be absorbed by the sponge sleeve 8, thereby reducing the humidity of the air and reducing the possibility of water vapor condensing into condensate on the sensing element 4.

[0028] like Figure 2 and Figure 3As shown, a tightening mechanism is provided between the lower ends of the outer shell 3 and the inner shell 2. The tightening mechanism includes an external thread 11. An external thread 11 is provided on the outer wall of the bottom end of the inner shell 2. A movable sleeve 12 is movably installed on the lower exterior of the inner shell 2. The movable sleeve 12 is threadedly connected to the external thread 11. A positioning mechanism is provided between the upper ends of the outer shell 3 and the inner shell 2. The positioning mechanism includes a threaded head 13. A threaded head 13 is provided on the outer exterior of the upper end of the sensor body 1. Several positioning grooves 14 are provided at the bottom end of the threaded head 13. A positioning block 15 matching the positioning grooves 14 is provided on the outer wall of the upper end of the outer shell 3.

[0029] In this embodiment, the external thread 11 in the tightening mechanism is located on the bottom outer wall of the inner shell 2. The movable sleeve 12 is threadedly connected to the external thread 11. When the movable sleeve 12 is tightened, it will tighten the lower end of the outer shell 3 and the inner shell 2. The threaded head 13 in the positioning mechanism is located on the upper outer side of the sensor body 1. The bottom end of the threaded head 13 is provided with several positioning grooves 14. The upper outer wall of the outer shell 3 is provided with a positioning block 15 that matches the positioning grooves 14, which makes disassembly and assembly more convenient.

[0030] Working principle: The rectifier plate 7 is annularly arranged on the inner wall of the inner shell 2, and its outer wall is fitted with a sponge sleeve 8. When the air around the oxygen sensor enters the space between the outer shell 3 and the inner shell 2, due to the arc-shaped structure at the upper end of the rectifier plate 7, the air is guided by the rectifier plate 7 during the flow, so that the air comes into full contact with the sponge sleeve 8. The sponge sleeve 8 has a strong moisture absorption capacity and can absorb the moisture in the air. The external thread 11 in the tightening mechanism is set at the bottom outer wall of the inner shell 2, and the movable sleeve 12 is threadedly connected to the external thread 11. When the movable sleeve 12 is tightened, it will tighten the lower end of the outer shell 3 and the inner shell 2. The threaded head 13 in the positioning mechanism is set on the upper outer side of the sensor body 1, and the bottom end of the threaded head 13 is provided with several positioning grooves 14. The upper outer wall of the outer shell 3 is provided with positioning blocks 15 that match the positioning grooves 14.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A condensation-proof oxygen sensor characterized by: The utility model provides a sensor, including Sensor body (1), be provided with inner shell (2) in the inside of sensor body (1), be provided with detection mechanism in the inside of inner shell (2); Be provided with outer shell (3) in the outside of inner shell (2), be provided with moisture absorption mechanism between outer shell (3) and inner shell (2), moisture absorption mechanism includes rectifier plate (7), annularly sets up rectifier plate (7) at the inner wall of inner shell (2), sponge cover (8) is sleeved in the outer wall of rectifier plate (7), and the upper end of rectifier plate (7) is arc structure; Be provided with tightening mechanism between outer shell (3) and the lower end of inner shell (2), and the tightening mechanism includes outer thread (11), is provided with outer thread (11) at the bottom outer wall of inner shell (2), movable cover (12) is movably installed below the outside of inner shell (2), movable cover (12) is screw -threaded with outer thread (11), be provided with positioning mechanism between outer shell (3) and the upper end of inner shell (2).

2. An anti-condensation oxygen sensor according to claim 1, wherein: Detection mechanism includes sensing element (4), is provided with sensing element (4) in the middle of the inside of inner shell (2), is provided with wire (5) in the middle of the top of sensor body (1), the inside of sensing element (4) is provided with heating rod (6), and heating rod (6) is electrically connected with wire (5).

3. An anti-condensation oxygen sensor according to claim 2, wherein: The upper end outer wall of inner shell (2) is provided with a plurality of perforations (9) with equal arc, and the bottom outer wall of outer shell (3) is provided with a plurality of air holes (10) with equal arc.

4. The condensation-preventing oxygen sensor according to claim 1, wherein: The positioning mechanism includes a threaded head (13), a threaded head (13) is provided on the outer end of the sensor body (1), a plurality of positioning grooves (14) are provided on the bottom end of the threaded head (13), and a positioning block (15) matched with the positioning grooves (14) is provided on the outer wall of the upper end of the outer shell (3).

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