Nitrogen-oxygen sensor

Abstract

The utility model relates to the technical field of sensors, in particular to a nitrogen-oxygen sensor, which comprises a nitrogen-oxygen sensor main body, and a first air inlet hole is formed in the air inlet end of the nitrogen-oxygen sensor main body; one end of the sleeve is open, the sleeve sleeves the air inlet end of the nitrogen-oxygen sensor main body, a cavity is formed between the inner wall of the sleeve and the nitrogen-oxygen sensor main body and is communicated with the first air inlet hole, and a second air inlet hole is formed in the side wall of the sleeve and is communicated with the cavity; the sealing plate is arranged in the sleeve in a sliding manner and can separate the cavity from the first air inlet hole; the driving assembly is used for driving the sealing plate to slide. The nitrogen-oxygen sensor has the effect of reducing dust accumulation or too high water vapor in the nitrogen-oxygen sensor.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of sensors, in particular to a nitrogen oxygen sensor. BACKGROUND

[0002] The nitrogen oxygen sensor (NOx sensor) is an important device for detecting and measuring the concentration of nitrogen oxides (NOx) and is widely used in the fields of automobile exhaust emission control, industrial production, environmental monitoring, etc. In the field of automobile exhaust emission, the nitrogen oxygen sensor is installed at the position of the automobile exhaust emission pipe to collect the exhaust emitted by the automobile. However, when the automobile stops running, the nitrogen oxygen sensor is still exposed to the air, and when it encounters humid weather or haze weather, the internal water vapor of the nitrogen oxygen sensor is prone to be too high or the dust is prone to be too much, thereby affecting the precision of the nitrogen oxygen sensor. CONTENT OF THE UTILITY MODEL

[0003] The application aims to provide a nitrogen oxygen sensor which can reduce the generation of internal dust accumulation or excessive water vapor of the nitrogen oxygen sensor.

[0004] The nitrogen oxygen sensor provided by the application adopts the following technical scheme:

[0005] The nitrogen oxygen sensor comprises:

[0006] A nitrogen oxygen sensor body, a first air inlet hole is formed in the air inlet end of the nitrogen oxygen sensor body;

[0007] A sleeve, one end of which is open and is sleeved on the air inlet end of the nitrogen oxygen sensor body, a cavity is arranged between the inner wall of the sleeve and the nitrogen oxygen sensor body, the cavity is in communication with the first air inlet hole, a second air inlet hole is formed in the side wall of the sleeve, and the second air inlet hole is in communication with the cavity;

[0008] A sealing plate, which is slidingly arranged in the sleeve and can separate the cavity from the first air inlet hole;

[0009] A driving assembly for driving the sealing plate to slide.

[0010] Optionally, a communication groove is formed in the sleeve, the inner diameter of the communication groove is smaller than the inner diameter of the sleeve, the second air inlet hole is in communication with the communication groove, the sealing plate is slidingly arranged in the communication groove and can slide into the cavity from the communication groove, and the sealing plate and the communication groove are adapted to separate the cavity from the communication groove.

[0011] Optionally, the driving assembly comprises a first connecting cylinder, a second connecting cylinder and a driving piece, the first connecting cylinder is fixed on the nitrogen oxygen sensor body, the second connecting cylinder is slidingly arranged in the first connecting cylinder and is fixedly connected with the sealing plate, and the driving piece can drive the second connecting cylinder to slide.

[0012] Optionally, the driving assembly further comprises an elastic member, one end of the elastic member acting on the first sleeve and the other end acting on the second sleeve.

[0013] Optionally, the driving member comprises a suction pipe and a suction pump, the suction pipe being in communication with the first connecting cylinder, and the suction pump being in communication with the suction pipe and being used for suction of the inside of the first connecting cylinder.

[0014] Optionally, the second air inlet hole is provided with a plurality of second air inlet holes, and the plurality of second air inlet holes are arranged around the sleeve.

[0015] The application drives the second connecting cylinder to slide through the suction of the suction pump, so as to make the sealing plate slide, realize the switching of the two states of the communication and isolation between the cavity and the outside world, and thus isolate the cavity from the outside world without detecting the tail gas, so as to reduce the generation of the high water vapor or large amount of dust in the nitrogen oxygen sensor main body. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a whole structure schematic diagram of a nitrogen oxygen sensor according to an embodiment of the application.

[0017] Figure 2 is a partial sectional structure schematic diagram of a nitrogen oxygen sensor according to an embodiment of the application.

[0018] In the figure, 1 is a nitrogen oxygen sensor main body; 11 is a first air inlet hole; 2 is a sleeve; 21 is a cavity; 22 is a second air inlet hole; 23 is a communication groove; 3 is a sealing plate; 4 is a driving assembly; 41 is a first connecting cylinder; 42 is a second connecting cylinder; 43 is a driving member; 431 is a suction pipe; and 44 is an elastic member. DETAILED DESCRIPTION

[0019] The following will be described in detail with reference to the accompanying drawings. Figure 1 - the accompanying drawings Figure 2 The application will be further described in detail.

[0020] A nitrogen oxygen sensor, with reference to Figure 1 and Figure 2 , comprises a nitrogen oxygen sensor main body 1, the nitrogen oxygen sensor main body 1 being provided with a first air inlet hole 11 at the air inlet end, and tail gas entering the nitrogen oxygen sensor main body 1 for detection through the first air inlet hole 11. In the embodiment, the first air inlet hole 11 is provided with a plurality of first air inlet holes 11, and the plurality of first air inlet holes 11 are arranged around the air inlet end of the nitrogen oxygen sensor main body 1. The plurality of first air inlet holes 11 are arranged, so as to increase the air inlet amount of the tail gas.

[0021] Further, the nitrogen oxygen sensor body 1 is provided with a sleeve 2 at the air inlet end, one end of the sleeve 2 is open and sleeved on the air inlet end of the nitrogen oxygen sensor body 1, and is fixedly connected with the nitrogen oxygen sensor body 1. A cavity 21 is arranged between the inner wall of the sleeve 2 and the nitrogen oxygen sensor body 1, and the first air inlet hole 11 communicates with the cavity 21.

[0022] A second air inlet hole 22 is formed in the sleeve 2, and the second air inlet hole 22 can communicate with the cavity 21, so as to realize the communication between the second air inlet hole 22 and the first air inlet hole 11. When the nitrogen oxygen sensor is working, the exhaust gas enters the cavity 21 through the second air inlet hole 22, and then enters the nitrogen oxygen sensor body 1 through the first air inlet hole 11, so as to detect the exhaust gas.

[0023] Further, the second air inlet hole 22 is provided with a plurality of second air inlet holes 22, and the plurality of second air inlet holes 22 are uniformly distributed around the sleeve 2. By arranging a plurality of second air inlet holes 22, the air inlet amount of the exhaust gas is increased.

[0024] The sealing plate 3 is slidably arranged in the sleeve 2, and the sealing plate 3 is used to separate the first air inlet hole 11 and the cavity 21 from each other, so as to reduce the external air entering the nitrogen oxygen sensor body 1 when the nitrogen oxygen sensor is not working, thereby reducing the generation of the conditions of dust accumulation or excessive water vapor in the nitrogen oxygen sensor body 1, ensuring the precision of the nitrogen oxygen sensor, and reducing the generation of the damage of the nitrogen oxygen sensor.

[0025] Specifically, a communication groove 23 is formed in the inner bottom wall of the sleeve 2 away from the nitrogen oxygen sensor body 1, the inner diameter of the communication groove 23 is smaller than the inner diameter of the sleeve 2, the communication groove 23 can communicate with the cavity 21, the second air inlet hole 22 communicates with the communication groove 23, so as to communicate with the cavity 21, and the sealing plate 3 is slidably arranged in the communication groove 23 and can slide from the communication groove 23 to the cavity 21. Since the inner diameter of the communication groove 23 is smaller than the inner diameter of the sleeve 2, when the sealing plate 3 slides to the cavity 21, the communication groove 23 communicates with the cavity 21. When the sealing plate 3 is located in the communication groove 23, the communication groove 23 is separated from the cavity 21, so that the second air inlet hole 22 is separated from the cavity 21, and the dust or water vapor entering the nitrogen oxygen sensor body 1 is reduced; when the exhaust gas needs to be detected, the sealing plate 3 slides away from the communication groove 23, so that the communication groove 23 communicates with the cavity 21, that is, the second air inlet hole 22 communicates with the cavity 21, so that the exhaust gas enters the cavity 21 and then enters the nitrogen oxygen sensor body 1 through the first air inlet hole 11 for detection.

[0026] By changing the position of the sealing plate 3, the communication between the cavity 21 and the outside and the mutual isolation between the cavity 21 and the outside are switched, so that the cavity 21 is isolated from the outside when the exhaust gas is not detected, so as to reduce the generation of the conditions of dust accumulation or excessive water vapor in the nitrogen oxygen sensor body 1.

[0027] Further, the nitrogen-oxygen sensor further comprises a driving assembly 4, which is used to drive the sealing plate 3 to slide, so as to switch the two states of the cavity 21 communicating with the outside and the cavity 21 being isolated from the outside.

[0028] Specifically, the driving assembly 4 comprises a first connecting cylinder 41, a second connecting cylinder 42 and a driving member 43, the first connecting cylinder 41 is fixed on the nitrogen-oxygen sensor body 1, the second connecting cylinder 42 is slidingly arranged in the first connecting cylinder 41 and is fixedly connected with the sealing plate 3, and the driving member 43 can drive the second connecting cylinder 42 to slide. In the embodiment, the first connecting cylinder 41 is open at one end close to the second connecting cylinder 42, the second connecting cylinder 42 is inserted into the open end of the first connecting cylinder 41, and the open end of the second connecting cylinder 42 is inserted into the first connecting cylinder 41 and is slidingly connected with the first connecting cylinder 41. The driving member 43 drives the second connecting cylinder 42 to slide, so as to drive the sealing plate 3 to slide, and further switch the two states of the cavity 21 communicating with the outside and the cavity 21 being isolated from the outside.

[0029] Further, the driving assembly 4 further comprises an elastic member 44, one end of the elastic member 44 acts on the first sleeve 2 and the other end acts on the second sleeve 2, when the nitrogen-oxygen sensor is running, the sealing plate 3 slides into the cavity 21, and the elastic member 44 is compressed; when the nitrogen-oxygen sensor stops running, the elastic member 44 restores, drives the sealing plate 3 to reset, so that the sealing plate 3 slides into the communicating groove 23 again. Through the arrangement of the elastic member 44, the automatic reset of the sealing plate 3 is realized, and the operation process is simpler.

[0030] Specifically, the driving member 43 comprises an air suction pipe 431 and an air suction pump (not shown in the figure), the air suction pipe 431 communicates with the first connecting cylinder 41, and the air suction pump communicates with the air suction pipe 431 and is used to perform air suction on the inside of the first connecting cylinder 41. Through the air suction of the air in the first connecting cylinder 41 and the second connecting cylinder 42, the second connecting cylinder 42 slides into the first connecting cylinder 41, so as to drive the sealing plate 3 to slide, when the sealing plate 3 needs to be reset, the elastic member 44 drives the sealing plate 3 to reset, and in the reset process, air can be introduced into the first connecting cylinder 41 and the second connecting cylinder 42, so as to accelerate the reset speed of the sealing plate 3.

[0031] The embodiments of the specific implementation are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape and principle of the present application should be covered in the protection scope of the present application.

Claims

1. A nitric oxide sensor, characterized by, The application relates to a nitrogen-oxygen sensor, which comprises the following parts: a nitrogen-oxygen sensor body (1) provided with a first air inlet hole (11) at an air inlet end; a sleeve (2) provided with an opening at one end and sleeved on the air inlet end of the nitrogen-oxygen sensor body (1), wherein a cavity (21) is arranged between the inner wall of the sleeve (2) and the nitrogen-oxygen sensor body (1), the cavity (21) is communicated with the first air inlet hole (11), a second air inlet hole (22) is arranged on the side wall of the sleeve (2) and communicated with the cavity (21); a sealing plate (3) slidingly arranged in the sleeve (2) and capable of separating the cavity (21) from the first air inlet hole (11); a driving assembly (4) for driving the sealing plate (3) to slide.

2. A NO sensor according to claim 1, wherein The sleeve (2) is provided with a communication groove (23) with an inner diameter smaller than that of the sleeve (2), the second air inlet hole (22) is communicated with the communication groove (23), the sealing plate (3) is slidingly arranged in the communication groove (23) and capable of sliding into the cavity (21) from the communication groove (23), and the sealing plate (3) and the communication groove (23) are matched to separate the cavity (21) from the communication groove (23).

3. A NO sensor according to claim 2, wherein The driving assembly (4) comprises a first connecting cylinder (41), a second connecting cylinder (42) and a driving piece (43), the first connecting cylinder (41) is fixed on the nitrogen-oxygen sensor body (1), the second connecting cylinder (42) is slidingly arranged in the first connecting cylinder (41) and fixedly connected with the sealing plate (3), and the driving piece (43) can drive the second connecting cylinder (42) to slide.

4. A NO sensor according to claim 3, wherein The driving assembly (4) further comprises an elastic piece (44), one end of the elastic piece (44) acts on the first connecting cylinder (41) and the other end acts on the second connecting cylinder (42).

5. A NO sensor according to any of claims 3 or 4, wherein the NO sensor is a NO2 sensor. The driving piece (43) comprises a suction pipe (431) and a suction pump, the suction pipe (431) is communicated with the first connecting cylinder (41), and the suction pump is communicated with the suction pipe (431) and used for sucking air in the first connecting cylinder (41).

6. The nitric oxide sensor of claim 1, wherein, The second air inlet hole (22) is provided with a plurality of second air inlet holes (22) arranged around the sleeve (2).

Images