Miniature exhaust valve of nitrogen-oxygen sensor

Abstract

The utility model provides a miniature exhaust valve of a nitrogen-oxygen sensor, and relates to the technical field of exhaust valves, the miniature exhaust valve of the nitrogen-oxygen sensor comprises an exhaust valve body, the exhaust valve body is provided with a circulation cavity and an exhaust port, and the circulation cavity is used for being communicated with a terminal hole of a connector of the nitrogen-oxygen sensor; at least part of the upper cover is connected with the exhaust valve body, and the upper cover is used for being arranged outside a terminal hole of the nitrogen-oxygen sensor connector; the waterproof breathable film is arranged between the upper cover and the exhaust valve body, the waterproof breathable film is arranged on the surface of the exhaust valve body, and the waterproof breathable film is used for isolating the circulation cavity from the exhaust port, so that the problems of water leakage, water seepage and terminal corrosion after the nitrogen-oxygen sensor is used for a long time in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to exhaust valve technical field, specifically, a kind of miniature exhaust valve of nitrogen oxygen sensor. BACKGROUND

[0002] Nitrogen oxygen sensor is a kind of component for detecting whether NOx value in engine exhaust emission is overproof in the process of automobile driving. China regulations have explicit requirements for diesel vehicle emission, and it is applied to the aftertreatment system of various vehicles to meet the national environmental protection requirements, which is conducive to improving air quality and reducing air pollution.

[0003] The nitrogen oxygen sensor in the prior art has the problems of water leakage, water seepage and terminal corrosion after long-term use due to the factors such as the inability to handle the water seepage into the shell, the low waterproof performance of the connector and the poor sealing of the split assembly structure, which leads to signal errors and even functional failures of the nitrogen oxygen sensor, thereby greatly reducing the service life of the nitrogen oxygen sensor.

[0004] Some nitrogen oxygen sensors are provided with moisture absorbent inside the packaging structure to absorb excess water and reduce the failure rate, but the packaging of the nitrogen oxygen sensor is not easy to disassemble and replace. Some nitrogen oxygen sensors are fully wrapped at the connector part, and a sealing plug is arranged between the plug-in tail end and the contact terminal to effectively reduce the failure of the sensor caused by water leakage and seepage, but the device has poor air permeability and requires high workmanship of the sealing plug of the connector, which is high in cost. SUMMARY

[0005] The main purpose of the utility model is to provide a miniature exhaust valve of nitrogen oxygen sensor to solve the problems of water leakage, water seepage and terminal corrosion of the nitrogen oxygen sensor after long-term use in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a miniature exhaust valve of nitrogen oxygen sensor is provided. The miniature exhaust valve of nitrogen oxygen sensor comprises: an exhaust valve body, the exhaust valve body has a flow-through cavity and an exhaust port, the flow-through cavity is used for communicating with the terminal hole of the nitrogen oxygen sensor connector; an upper cover, at least part of the upper cover is connected with the exhaust valve body, the upper cover is used for being arranged outside the terminal hole of the nitrogen oxygen sensor connector; a waterproof and breathable film, the waterproof and breathable film is arranged between the upper cover and the exhaust valve body, the waterproof and breathable film is arranged on the surface of the exhaust valve body, and the waterproof and breathable film is used for isolating the flow-through cavity and the exhaust port.

[0007] Further, at least part of the upper cover is arranged at a distance from the exhaust valve body, the upper cover and the exhaust valve body form a hollow cavity, the hollow cavity is arranged in communication with the exhaust port, and the waterproof and breathable film is used for isolating the hollow cavity and the flow-through cavity.

[0008] Further, the outer wall of the exhaust valve body is provided with a boss structure, the upper cover comprises a connecting lug and an upper cover body, the upper cover body is connected with the connecting lug, the upper cover body is arranged away from the exhaust valve body, the upper cover body and the exhaust valve body form a hollow cavity, the connecting lug abuts against the boss structure, and the exhaust port is arranged at the boss structure.

[0009] Further, a silica gel body is arranged along at least part of the circumference of the exhaust valve body, and an outer wall of the silica gel body abuts against an inner wall of the nitrogen oxygen sensor connector terminal hole.

[0010] Further, the exhaust port is provided as at least two.

[0011] Further, the exhaust valve body is made of at least one of a flame retardant, polybutylene terephthalate and glass fiber.

[0012] Further, the waterproof and breathable membrane is made of expanded polytetrafluoroethylene.

[0013] Further, the waterproof and breathable membrane has a thickness h, wherein 0.09mm≤h≤0.15mm.

[0014] Further, the waterproof and breathable membrane has a temperature resistance a, wherein -50℃≤a≤180℃.

[0015] Further, the waterproof and breathable membrane has a gas permeation amount b, wherein 40ml / cm 2 / min@7kpa≤b≤80ml / cm 2 / min@7kpa.

[0016] The technical scheme of the utility model, through setting up the exhaust valve body, the exhaust valve body is used for being placed in the terminal hole of the nitrogen oxygen sensor connector, the waterproof and breathable membrane is arranged between the upper cover and the exhaust valve body and the waterproof and breathable membrane is arranged on the surface of the exhaust valve body, so that the hot gas generated by the nitrogen oxygen sensor working can flow to the waterproof and breathable membrane through the flow cavity, due to the gas permeation characteristics of the waterproof and breathable membrane, the hot gas can permeate through the waterproof and breathable membrane and flow to the exhaust port and then be discharged, meanwhile, the waterproof and breathable membrane plays a waterproof role, in addition, the upper cover is used for being arranged outside the terminal hole of the nitrogen oxygen sensor connector, so as to prevent external moisture and dust, thereby realizing comprehensive protection of the sensor, improving the reliability of the nitrogen oxygen sensor and increasing the service life of the nitrogen oxygen sensor. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of this application form a part hereof, serve to provide further understanding of the utility model, and together with the exemplary embodiments of the utility model and their description, explain the utility model, and do not constitute an improper limitation on the utility model. In the drawings:

[0018] Figure 1A cross-sectional view of a first embodiment of a micro exhaust valve of a nitrogen-oxygen sensor according to the present application is shown.

[0019] Figure 2 A structure view of a second embodiment of a micro exhaust valve of a nitrogen-oxygen sensor according to the present application is shown.

[0020] Figure 3 A cross-sectional view of a third embodiment of a micro exhaust valve of a nitrogen-oxygen sensor according to the present application is shown.

[0021] Among them, the above-mentioned drawings include the following reference signs:

[0022] 10, exhaust valve body; 11, flow-through cavity; 12, exhaust port; 13, hollow cavity;

[0023] 20, upper cover; 21, connecting lug; 22, upper cover body;

[0024] 30, waterproof and breathable membrane;

[0025] 40, silica gel body;

[0026] 100, nitrogen-oxygen sensor connector. DETAILED DESCRIPTION

[0027] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the terms used herein can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept of these exemplary embodiments to those skilled in the art, and in the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same reference numerals are used throughout the drawings and the same elements are depicted with the same caption, and thus a repeated description thereof will be omitted.

[0031] It should be noted that the nitrogen oxygen sensor generates heat, which makes itself and the temperature inside the interface plug higher than the external temperature, thermal expansion will expel gas, and after the temperature decreases, a pressure difference occurs to produce a siphon phenomenon, and external water vapor will enter the nitrogen oxygen sensor through the edge of the plug or the wire, so on the basis of the original plug seal, a waterproof and breathable structure is added to avoid the generation of the siphon phenomenon, to achieve the waterproof effect and reduce the failure rate of the nitrogen oxygen sensor.

[0032] In combination Figures 1 to 3 According to the specific embodiment of the utility model, a micro exhaust valve of a nitrogen oxygen sensor is provided.

[0033] Specifically, as shown in Figure 1 , Figure 2 The micro exhaust valve of the nitrogen oxygen sensor comprises: an exhaust valve body 10, the exhaust valve body 10 has a flow-through cavity 11 and an exhaust port 12, the flow-through cavity 11 is used for communicating with a terminal hole of a nitrogen oxygen sensor connector; an upper cover 20, at least part of the upper cover 20 is connected with the exhaust valve body 10, the upper cover 20 is used for being arranged outside the terminal hole of the nitrogen oxygen sensor connector; a waterproof and breathable film 30, the waterproof and breathable film 30 is arranged between the upper cover 20 and the exhaust valve body 10, the waterproof and breathable film 30 is arranged on the surface of the exhaust valve body 10, and the waterproof and breathable film 30 is used for isolating the flow-through cavity 11 and the exhaust port 12.

[0034] In the embodiment, the exhaust valve body 10 is arranged in the terminal hole of the nitrogen oxygen sensor connector 100, the waterproof and breathable film 30 is arranged between the upper cover 20 and the exhaust valve body 10, and the waterproof and breathable film 30 is arranged on the surface of the exhaust valve body 10, so that the hot gas generated by the nitrogen oxygen sensor can flow to the waterproof and breathable film 30 through the flow cavity 11. Due to the breathable property of the waterproof and breathable film 30, the hot gas can pass through the waterproof and breathable film 30 to the exhaust port 12 and then be discharged, and the waterproof and breathable film 30 plays a waterproof role. In addition, the upper cover 20 is arranged outside the terminal hole of the nitrogen oxygen sensor connector to prevent external moisture and dust, thereby achieving comprehensive protection of the sensor, improving the reliability of the nitrogen oxygen sensor, and increasing the service life of the nitrogen oxygen sensor.

[0035] As shown in Figure 1 , Figure 3 At least part of the upper cover 20 is arranged away from the exhaust valve body 10, the upper cover 20 and the exhaust valve body 10 form a hollow cavity 13, the hollow cavity 13 is arranged in communication with the exhaust port 12, and the waterproof and breathable film 30 is arranged to separate the hollow cavity 13 from the flow cavity 11.

[0036] The upper cover 20 can prevent sand dust from splashing and clogging and damaging the waterproof and breathable film 30, and the hollow cavity 13 also plays a buffering role and a gas flow role.

[0037] Further, the outer wall of the exhaust valve body 10 is provided with a boss structure 14, the upper cover 20 includes a connecting lug 21 and an upper cover body 22, the upper cover body 22 is connected with the connecting lug 21, the upper cover body 22 is arranged away from the exhaust valve body 10, the upper cover body 22 and the exhaust valve body 10 form a hollow cavity 13, the connecting lug 21 abuts against the boss structure 14, and the exhaust port 12 is arranged at the boss structure 14.

[0038] Specifically, the boss structure 14 not only increases the strength of the outer wall of the exhaust valve body 10, but also provides an additional fixing point through abutment with the connecting lug 21, thereby ensuring firm connection between the upper cover 20 and the exhaust valve body 10. The upper cover body 22 is arranged away from the exhaust valve body 10 to form the hollow cavity 13, which plays a buffering role for air flow and performance of the waterproof and breathable film 30.

[0039] Further, the silica gel body 40 is arranged along at least part of the circumference of the exhaust valve body 10, and the outer wall of the silica gel body 40 abuts against the inner wall of the terminal hole of the nitrogen oxygen sensor connector.

[0040] Specifically, the silica gel material has good shock absorption performance, therefore, the silica gel body 40 arranged in the circumference of the exhaust valve body 10 can absorb the vibration and impact during the driving of the automobile, reduce the influence of the external force on the micro exhaust valve and the internal structure of the nitrogen oxygen sensor, and improve the stability and durability of the entire sensor system.

[0041] Further, the exhaust port 12 is arranged as at least two.

[0042] Further, the exhaust valve body 10 is made of at least one of a flame retardant, polybutylene terephthalate, and glass fiber. Specifically, the exhaust valve body 10 adopts a high-temperature-resistant flame-retardant PBT plus glass fiber material to ensure its working stability under harsh conditions such as high temperature, humidity, and chemical corrosion, and also improve its structural strength and safety.

[0043] Further, the waterproof and breathable membrane 30 is made of expanded polytetrafluoroethylene, and the waterproof and breathable membrane 30 can reach the IP68 waterproof level, so that the waterproof and breathable membrane 30 has good waterproof and breathable performance, and also ensures the chemical resistance, temperature resistance, low friction, high wear resistance, and structural stability.

[0044] Further, the thickness of the waterproof and breathable membrane 30 is h, wherein 0.09mm≤h≤0.15mm.

[0045] Further, the temperature resistance of the waterproof and breathable membrane 30 is a, wherein -50℃≤a≤180℃.

[0046] Further, the air permeation amount of the waterproof and breathable membrane 30 is b, wherein 40ml / cm 2 / min@7kpa≤b≤80ml / cm 2 / min@7kpa.

[0047] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0048] (1) has good waterproof performance, effectively solves the problem of water leakage of the nitrogen oxygen sensor connector;

[0049] (2) has good air permeability, the bidirectional waterproof and breathable membrane insulates water vapor, sand and dust, and also ensures good exhaust performance;

[0050] (3) simple installation, convenient to use, and stronger application compatibility;

[0051] (4) low cost, greatly improves the economic applicability under the condition of ensuring high reliability.

[0052] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0053] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this utility model.

[0054] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0055] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A micro exhaust valve for a nitric oxide sensor, characterized by, The exhaust valve body (10) has a flow-through cavity (11) for communicating with the terminal hole of the nitrogen oxygen sensor connector and an exhaust port (12); The upper cover (20) is connected with the exhaust valve body (10) at least partially, and the upper cover (20) is arranged outside the terminal hole of the nitrogen oxygen sensor connector; The waterproof and breathable film (30) is arranged between the upper cover (20) and the exhaust valve body (10), and the waterproof and breathable film (30) is arranged on the surface of the exhaust valve body (10), and the waterproof and breathable film (30) is used for isolating the flow-through cavity (11) and the exhaust port (12). At least part of the upper cover (20) is arranged away from the exhaust valve body (10), and the upper cover (20) and the exhaust valve body (10) form a hollow cavity (13), the hollow cavity (13) is arranged in communication with the exhaust port (12), and the waterproof and breathable film (30) is used for isolating the hollow cavity (13) and the flow-through cavity (11).

2. The micro exhaust valve for a NOxsensor according to claim 1, wherein The outer wall of the exhaust valve body (10) is provided with a boss structure (14), the upper cover (20) comprises a connecting lug (21) and an upper cover body (22), the upper cover body (22) is connected with the connecting lug (21), the upper cover body (22) is arranged away from the exhaust valve body (10), the upper cover body (22) and the exhaust valve body (10) form the hollow cavity (13), the connecting lug (21) abuts against the boss structure (14), and the exhaust port (12) is arranged at the boss structure (14).

3. The micro exhaust valve for a NOxsensor according to claim 2, characterized by, Silica gel (40) is arranged along at least part of the circumference of the exhaust valve body (10), and the outer wall of the silica gel (40) abuts against the inner wall of the terminal hole of the nitrogen oxygen sensor connector.

4. The micro exhaust valve for a NOxsensor according to claim 3, characterized by The exhaust port (12) is provided as at least two.

5. The micro exhaust valve for a NOxsensor according to claim 4, wherein The exhaust valve body (10) is made of one of a flame retardant, polybutylene terephthalate and glass fiber.

6. The micro exhaust valve for a NOxsensor according to claim 5, wherein The waterproof and breathable film (30) is made of expanded polytetrafluoroethylene.

7. The micro exhaust valve for a NOxsensor of claim 5, wherein, The thickness of the waterproof and breathable film (30) is h, wherein 0.09mm≤h≤0.15mm.

8. The micro exhaust valve for a NOxsensor of claim 1, wherein, The temperature resistance of the waterproof and breathable film (30) is a, wherein -50℃≤a≤180℃.

9. The micro exhaust valve for a NOxsensor of claim 1, wherein, The air permeability of the waterproof and breathable film (30) is b, wherein 40ml / cm² / min@7kpa≤b≤80ml / cm² / min@7kpa.

10. The micro exhaust valve for a NOxsensor of claim 1, wherein, ​

Images