A small volume exhaust pressure sensor structure

Abstract

The utility model relates to sensor technical field. A kind of small volume exhaust pressure sensor structure, including integrally-formed sensor shell, integrally-formed response hole is formed in sensor shell bottom, positioning groove is opened in sensor shell, and pressure sensing chip is installed in positioning groove;Pressure sensing chip bottom is equipped with sealing element, and positioning element for fixing pressure sensing chip is equipped in positioning groove;Pressure sensing chip top is equipped with potting adhesive, and sensor shell top is fixed with cover plate.The utility model provides a kind of small volume exhaust pressure sensor structure with good sealing performance, with compact structure, the characteristics of easy installation and maintenance, can satisfy higher use demand;Solve the technical problems of the defects existing in the prior art exhaust pressure sensor structure design, inconvenient installation and maintenance, the sealing of part sensor is poor, gas leakage is easy to appear, not only influence measurement result, there can be also security risk.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a small-volume exhaust pressure sensor structure. Background Technology

[0002] During engine operation, exhaust pressure is an important operating parameter. Accurate monitoring of exhaust pressure helps improve engine combustion efficiency, reduce emissions, and detect exhaust system malfunctions in a timely manner.

[0003] Currently available exhaust pressure sensors have some shortcomings. Some sensors are prone to measurement inaccuracies under complex exhaust environments such as high temperatures and vibrations, resulting in inaccurate measurement data that cannot provide reliable information for engine control and fault diagnosis. Other sensors have unreasonable structural designs, making installation and maintenance inconvenient and increasing usage and time costs. In addition, some sensors have poor sealing, making them prone to gas leakage under the high pressure of the exhaust system, which not only affects measurement results but may also pose safety hazards. Therefore, improvements are necessary. Utility Model Content

[0004] This invention provides a small-volume exhaust pressure sensor structure with excellent sealing performance, capable of maintaining high-precision pressure measurement under complex environments such as high temperature and vibration. It features a compact structure, convenient installation and maintenance, and can meet higher usage requirements. It solves the technical problems existing in the current exhaust pressure sensor structure design, such as inconvenience in installation and maintenance, poor sealing of some sensors, and easy gas leakage under high pressure environment of exhaust system, which not only affects the measurement results but may also pose safety hazards.

[0005] The above-mentioned technical problem of this utility model is solved by the following technical solution: a small-volume exhaust pressure sensor structure includes an integrally formed sensor housing, a sensing hole integrally formed at the bottom of the sensor housing, a positioning groove formed inside the sensor housing, and a pressure sensing chip installed in the positioning groove; a sealing element is provided at the bottom of the pressure sensing chip, and a positioning element for fixing the pressure sensing chip is provided in the positioning groove; potting compound is provided above the pressure sensing chip, and a cover plate is fixed to the top of the sensor housing. The sensor housing of this utility model is integrally formed, with a pre-formed concave positioning groove, the pressure sensing chip is installed in the positioning groove, and the top of the pressure sensing chip is sealed by potting compound.

[0006] Preferably, the positioning component includes several hot-riveting posts integrally formed at the bottom of the positioning groove, and the pressure sensing chip is fixed inside the sensor housing by the hot-riveting posts. The number and position of the hot-riveting posts can be adjusted according to requirements. This utility model is illustrated using four hot-riveting posts as an example, and the pressure sensing chip is fixed inside the sensor housing by hot riveting process.

[0007] Preferably, the sensor housing has an integrally formed connector on the left side, and the sensor housing is encapsulated with pins that extend to the connector. In this invention, the pins are encapsulated within the sensor housing, one end of the pin is electrically connected to the pressure sensing chip via laser welding, and the other end of the pin extends to the connector.

[0008] Preferably, the sealing element includes a dispensing groove formed at the bottom of the positioning groove inside the sensor housing, with an annular pressure sealant inside the dispensing groove. This invention uses a high-precision piezoresistive sensor chip as the pressure-sensitive element. The pressure-sensing chip is fixed to the dispensing groove by the pressure sealant, and the pressure sealant and the top potting compound can provide vibration damping. The pressure sealant and potting compound act as an elastic buffer layer to improve its vibration resistance and ensure measurement accuracy. The dual sealing measures achieved through the potting compound and pressure sealant effectively prevent gas leakage, ensuring measurement accuracy and safety, and avoiding safety hazards and measurement errors caused by gas leakage.

[0009] Preferably, the right side of the sensor housing is covered with a plastic-coated insert ring. In this invention, both the pins and the insert ring are encased in plastic within the sensor housing; the insert ring is used to increase the strength of the mating plastic parts with the client.

[0010] Preferably, the cover plate is laser-welded to the top of the sensor housing.

[0011] Preferably, the bottom of the sensor housing is integrally formed with a mating interface corresponding to the pressure sensing chip, and a sealing ring is fitted on the outside of the mating interface. The mating interface is formed correspondingly to the sensing hole and the pressure sensing chip for mating with the client, and the sealing ring on the outside of the mating interface ensures a tight seal when mating with the client.

[0012] Therefore, the small-volume exhaust pressure sensor structure of this utility model has the following advantages: it has good sealing performance, can maintain high-precision pressure measurement in complex environments such as high temperature and vibration, and has the characteristics of compact structure and convenient installation and maintenance, which can meet higher usage requirements. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a small-volume exhaust pressure sensor according to the present invention.

[0014] Figure 2 yes Figure 1 A schematic diagram of the main structure.

[0015] Figure 3 yes Figure 1 A schematic diagram of the front sectional view of the structure.

[0016] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0017] Figure 5 yes Figure 1 A schematic diagram of the explosion structure.

[0018] In the figure, 1 is the sensor housing, 2 is the connector, 3 is the pin, 4 is the embedded ring, 5 is the pressure sensing chip, 6 is the hot riveting post, 7 is the dispensing groove, 8 is the pressure sealant, 9 is the interface, 10 is the sealing ring, 11 is the potting compound, and 12 is the cover plate. Detailed Implementation

[0019] The technical solution of the utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0020] Example: like Figure 1 and 2 As shown in Figures 3, 4, and 5, a small-volume exhaust pressure sensor structure includes an integrally formed sensor housing 1. The bottom of the sensor housing 1 has several interfaces for bolt connection. The left side of the sensor housing 1 has an integrally formed connector 2. The sensor housing 1 is encased in plastic with pins 3, and the ends of the pins 3 extend into the connector 2.

[0021] The sensor housing 1 has a plastic-coated annular embedded ring 4 on its right side.

[0022] A positioning groove is provided inside the sensor housing 1, and the pressure sensing chip 5 is installed in the positioning groove. The pressure sensing chip 5 is electrically connected to the pin 3 by laser welding.

[0023] A positioning component is installed inside the sensor housing 1. The positioning component includes four hot-riveting posts 6 integrally formed in the positioning groove. The pressure sensing chip 5 is fixed inside the sensor housing 1 by hot riveting using the hot-riveting posts 6.

[0024] A sealing element is installed inside the sensor housing 1. The sealing element includes an annular dispensing groove 7 opened in the positioning groove at the bottom of the pressure sensing chip 5, and pressure sealant 8 is installed in the dispensing groove 7.

[0025] The bottom of the sensor housing 1 is integrally formed with a sensing hole and a matching interface 9 corresponding to the pressure sensing chip 5, and a sealing ring 10 is fitted on the outside of the matching interface 9.

[0026] The pressure sensing chip 5 is filled with potting compound 11, and the sensor housing 1 is welded with a cover plate 12.

[0027] In this invention, both the pin 3 and the embedded ring 4 are encased in plastic within the sensor housing 1. The embedded ring 4 is used to increase the strength of the mating plastic parts with the client. One end of the pin 3 is connected to the pressure sensing chip 5, and the other end of the pin 3 extends to the connector 2.

[0028] The pressure sensing chip 5 is fixed to the dispensing groove 7 by pressure sealant 8, and the pressure sensing chip 5 is fixed to the sensor housing 1 by hot riveting pin 6.

[0029] The pressure sensing chip 5 is sealed by potting compound 11 on top, and the cover plate 12 is fixed to the top of the sensor housing 1 by laser welding. The pressure sensor of this invention has good sealing performance and can maintain high-precision pressure measurement in complex environments such as high temperature and vibration. It is also characterized by its compact structure and convenient installation and maintenance.

[0030] The specific embodiments described herein are merely illustrative examples of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A small-volume exhaust pressure sensor structure, characterized in that: The sensor housing includes an integrally formed sensor housing with a sensing hole integrally formed at the bottom. A positioning groove is formed inside the sensor housing, and a pressure sensing chip is installed in the positioning groove. A sealing element is provided at the bottom of the pressure sensing chip, and a positioning element for fixing the pressure sensing chip is provided in the positioning groove. Encapsulating glue is provided above the pressure sensing chip, and a cover plate is fixed to the top of the sensor housing.

2. The small-volume exhaust pressure sensor structure according to claim 1, characterized in that: The positioning component includes several hot-riveting posts integrally formed at the bottom of the positioning groove, and the pressure sensing chip is fixed inside the sensor housing by the hot-riveting posts.

3. The small-volume exhaust pressure sensor structure according to claim 1, characterized in that: The sensor housing has an integrally formed connector on the left side, and the sensor housing is encased in plastic with pins that extend to the connector.

4. The structure of a small-volume exhaust pressure sensor according to claim 1, characterized in that: The sealing element includes a dispensing groove formed at the bottom of the positioning groove inside the sensor housing, and the dispensing groove is provided with an annular pressure sealant.

5. The structure of a small-volume exhaust pressure sensor according to claim 1, characterized in that: The sensor housing has a plastic-coated embedded ring on the right side.

6. The small-volume exhaust pressure sensor structure according to claim 1, characterized in that: The cover plate is laser-welded to the top of the sensor housing.

7. The structure of a small-volume exhaust pressure sensor according to claim 1, characterized in that: The bottom of the sensor housing is integrally formed with a matching interface corresponding to the pressure sensing chip, and a sealing ring is fitted on the outside of the matching interface.

Images