A fuel vapor pressure sensor

Abstract

The utility model discloses a fuel vapor pressure sensor belongs to pressure sensor technical field. A kind of fuel vapor pressure sensor, including shell and connector connected on shell, be provided with detection chamber on shell, still include: fixedly connected on the gas nozzle of shell;Detection platform is installed in detection chamber, and the detection end of detection platform is linked with gas nozzle, and detection platform is provided with isolator, for separating gas nozzle and detection chamber;Plugging piece, exhaust structure is opened in cover plate, and plugging piece is used to close exhaust structure;The utility model is opened exhaust structure on cover plate, to install detection platform and cover plate in detection chamber after well, using sealant to seal its edge, due to the existence of exhaust structure, the excess gas in sealed chamber can be promptly discharged, then using plugging piece to close exhaust structure, it can guarantee the pressure stability in detection chamber, to improve the use stability and the accuracy of detection of entire sensor.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor technology, and in particular to a fuel vapor pressure sensor. Background Technology

[0002] The fuel vapor pressure sensor is a core component of the fuel supply system. It is mainly used in systems such as fuel tanks or fuel pumps to monitor the pressure or vapor pressure in the fuel line or fuel rail in real time, and converts the pressure signal into an electrical signal to transmit to the engine control unit (ECU). This provides the ECU with a key basis for adjusting the fuel injection quantity and ensuring the normal operation of the engine. The fuel vapor pressure sensor has an electrical connection plug and a gas passage, as well as a sealed chamber for installing electrical signal elements.

[0003] In the prior art, in order to ensure the sealing effect of the sealed chamber during production, the cover plate of the sealed chamber is often sealed by injecting sealant. However, during the melting and cooling process of the sealant, the pressure inside the sealed chamber is easily increased, resulting in unstable pressure in the sealed chamber. During use, due to temperature fluctuations, the cover plate may detach or the detection error of the electrical signal element may occur. To address this, we propose a fuel vapor pressure sensor. Utility Model Content

[0004] The purpose of this invention is to solve the problem of unstable pressure inside the sealed chamber during the sealing process in the prior art, and to propose a fuel vapor pressure sensor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A fuel vapor pressure sensor includes a housing and a connector connected to the housing. The housing has a detection chamber covered by a cover plate. The sensor also includes: a gas nozzle fixedly connected to the housing; a detection platform installed in the detection chamber, wherein the detection end of the detection platform is connected to the gas nozzle, and an isolating element is provided on the detection platform to separate the gas nozzle and the detection chamber; and a sealing element, wherein the cover plate has an exhaust structure, and the sealing element is used to seal the exhaust structure.

[0007] Preferably, the exhaust structure is a through hole or a through groove.

[0008] To ensure stable pressure within the sealed chamber, preferably, the isolation element includes a first sealing colloid, an annular groove is formed within the detection chamber, an mounting ring is provided at the bottom of the detection platform, the mounting ring is inserted into the annular groove, and the first sealing colloid is cast into the annular groove.

[0009] To ensure the stability of the test, preferably, a pressure-sensing chip and a conditioning chip are installed on the test platform, with the pressure-sensing chip facing the air nozzle.

[0010] To improve the sealing effect of the sensor connection, preferably, the air nozzle is cylindrical and the end of the air nozzle is fitted with a sealing ring.

[0011] Preferably, the connector is provided with a pin, one end of which extends into the detection chamber and connects to the detection stage.

[0012] To ensure the stability of the cover plate connection, preferably, a second sealing adhesive is also included, which is poured between the cover plate and the housing.

[0013] Furthermore, an installation groove is provided in the detection chamber, the cover plate is embedded in the installation groove, and the second sealing colloid is poured into the installation groove.

[0014] Preferably, the testing stage is a ceramic plate, an aluminum substrate, or a PCB board.

[0015] Preferably, the sealing element is rivet-shaped.

[0016] Compared with the prior art, the present invention provides a fuel vapor pressure sensor, which has the following advantages:

[0017] 1. The fuel vapor pressure sensor is isolated from the air intake channel of the valve stem by casting a first sealing colloid into the annular groove, so that the gas only acts on the pressure sensing chip, thereby directly acquiring pressure data.

[0018] 2. The sealing component of this fuel vapor pressure sensor can also be a molten sealing gel, which can be applied directly to seal the exhaust structure, thereby further improving the sealing condition of the entire sensor and preventing water from entering the detection chamber and affecting the service life of the internal electrical signal components.

[0019] 3. This fuel vapor pressure sensor integrates electronic components such as the MEMS pressure-sensing chip 601 and the ASIC conditioning chip 602 into a single package. The pins are directly connected to the external lead frame, resulting in high integration, improved reliability, and the ability to achieve automated assembly.

[0020] 4. This fuel vapor pressure sensor achieves electrical connection by laser welding the pins extending from the detection platform to the insertion pins. It is stable and reliable under the complex operating conditions of automobiles. The components and copper wires are covered with silicone filler, and the inside is sealed with adhesive, giving the sensor excellent corrosion resistance.

[0021] The parts of this device not described herein are the same as or can be implemented using existing technologies. This utility model opens an exhaust structure on the cover plate, so that after the detection stage and cover plate are installed in the detection chamber, the edges are sealed with sealing glue. Due to the existence of the exhaust structure, excess gas in the sealed chamber can be discharged in time. Then, the exhaust structure is sealed with a sealing component, which can ensure the pressure in the detection chamber is stable, thereby improving the stability of the entire sensor and the accuracy of detection. Attached Figure Description

[0022] Figure 1 This is a first-view perspective perspective view of a fuel vapor pressure sensor proposed in this utility model.

[0023] Figure 2 This is a second-view perspective perspective view of a fuel vapor pressure sensor proposed in this utility model.

[0024] Figure 3 This is a plan view of a fuel vapor pressure sensor proposed in this utility model;

[0025] Figure 4 This is a planar sectional view of a fuel vapor pressure sensor proposed in this utility model.

[0026] Figure 5 This is an unfolded view of a fuel vapor pressure sensor proposed in this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of a fuel vapor pressure sensor detection station proposed in this utility model.

[0028] In the diagram: 100, housing; 101, mounting slot; 200, connector; 201, pin; 300, air nozzle; 301, sealing ring; 400, cover plate; 401, sealing element; 500, second sealing gel; 501, first sealing gel; 600, testing platform; 601, pressure sensing chip; 602, conditioning chip. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Example:

[0032] Reference Figures 1-6 A fuel vapor pressure sensor includes a rectangular housing 100 and a cylindrical connector 200 connected along the length of the housing 100. Three pins 201 are installed inside the connector 200, with one end of each pin extending into a detection chamber. A detection chamber is formed at the center of the housing 100. After assembly, the detection chamber is in a sealed, constant-pressure state. A cover plate 400 is provided at the opening of the detection chamber through a sealing gel cover. An exhaust structure is provided on the cover plate 400, and a flexible sealing element 401 is used to seal the exhaust structure. A gas guide nozzle 300 is fixedly connected to the bottom of the housing 100. A detection platform 600 is fixed inside the detection chamber. The detection end is connected to the gas nozzle 300. When gas enters the gas nozzle 300, the pressure of the gas can be directly detected by the MEMS pressure-sensing chip 601 on the detection end. In addition, an isolator is provided on the side of the detection stage 600 that contacts the detection chamber to separate the gas nozzle 300 and the detection chamber, preventing gas from entering the detection chamber and causing pressure instability in the detection chamber. In some embodiments, the detection stage 600 has an ASIC conditioning chip 602. The MEMS pressure-sensing chip 601 and the ASIC conditioning chip 602 and other electronic components are integrated into a single package. The pins are directly connected to the external lead frame, resulting in high integration, improved reliability, and automated assembly.

[0033] In the above design, by opening an exhaust structure on the cover plate 400, after the detection stage 600 and the cover plate 400 are installed in the detection chamber, the edges are sealed with a sealing adhesive. Due to the existence of the exhaust structure, excess gas in the sealed chamber can be discharged in time. Then, the exhaust structure is sealed with a sealing component 401, which can ensure the pressure in the detection chamber is stable, thereby improving the stability of the entire sensor and the accuracy of detection.

[0034] Specifically, the exhaust structure consists of through holes or through slots.

[0035] The isolation component includes a first sealing colloid 501. An annular groove is formed in the detection chamber, and the annular groove is arranged around the gas nozzle 300. A mounting ring is provided at the bottom of the detection stage 600, and the mounting ring is arranged around the pressure sensing chip 601. The mounting ring is inserted into the annular groove. The first sealing colloid 501 is poured into the annular groove, thereby isolating the air inlet channel of the gas nozzle 300 from the detection chamber, so that the gas only acts on the pressure sensing chip 601, thereby directly obtaining pressure data.

[0036] The air nozzle 300 is cylindrical, and a sealing ring 301 is fitted at the end of the air nozzle 300 to improve the sealing effect of the connection.

[0037] After the detection platform 600 is installed and the pin 201 is connected to the extended pin of the detection platform 600, molten second sealing glue 500 is poured between the cover plate 400 and the housing 100 to seal the detection chamber. As the second sealing glue 500 solidifies, excess gas in the detection chamber is discharged through the exhaust structure to ensure stable pressure in the detection chamber. In some embodiments, the detection platform 600 is made of PPS material, which is resistant to high temperature and corrosion. The copper wire connecting the extended pin is made of copper plated with nickel palladium gold, which has excellent solderability and oxidation resistance. It is electrically connected to the pin 201 by laser welding, which is stable and reliable under the complex operating conditions of automobiles. The components and copper wires are covered with silicone filler and sealed internally by dispensing, giving the sensor good corrosion resistance.

[0038] Specifically, an installation groove 101 is provided in the detection chamber, a cover plate 400 is embedded in the installation groove 101, and a second sealing colloid 500 is poured into the installation groove 101.

[0039] The testing station 600 is made of ceramic plate, aluminum substrate or PCB board.

[0040] The sealing component 401 is rivet-shaped, and it can also be a molten sealing adhesive. It can be used to directly seal the venting structure by dispensing, thereby further improving the sealing condition of the entire sensor and preventing water from entering the detection chamber and affecting the service life of the internal electrical signal components.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A fuel vapor pressure sensor, comprising a housing (100) and a connector (200) connected to the housing (100), wherein a detection chamber is provided on the housing (100), and a cover plate (400) is provided on the detection chamber, characterized in that, Also includes: An air nozzle (300) is fixedly connected to the housing (100). The testing station (600) is installed inside the testing chamber. The detection end of the detection platform (600) is connected to the air nozzle (300), and the detection platform (600) is equipped with an isolation component to separate the air nozzle (300) and the detection chamber. Sealing component (401). The cover plate (400) is provided with an exhaust structure, and the sealing member (401) is used to seal the exhaust structure.

2. The fuel vapor pressure sensor according to claim 1, characterized in that, The exhaust structure is a through hole or through groove.

3. A fuel vapor pressure sensor according to claim 1, characterized in that, The isolation component includes a first sealing colloid (501), an annular groove is formed in the detection chamber, an installation ring is provided at the bottom of the detection stage (600), the installation ring is inserted into the annular groove, and the first sealing colloid (501) is cast into the annular groove.

4. A fuel vapor pressure sensor according to claim 1, characterized in that, The detection station (600) is equipped with a pressure-sensing chip (601) and a conditioning chip (602), with the pressure-sensing chip (601) facing the air nozzle (300).

5. A fuel vapor pressure sensor according to claim 1, characterized in that, The air nozzle (300) is cylindrical, and a sealing ring (301) is fitted at the end of the air nozzle (300).

6. A fuel vapor pressure sensor according to claim 1, characterized in that, The connector (200) is provided with a pin (201), one end of which extends into the detection chamber and is connected to the detection stage (600).

7. A fuel vapor pressure sensor according to claim 1, characterized in that, It also includes a second sealing compound (500), which is poured between the cover plate (400) and the housing (100).

8. A fuel vapor pressure sensor according to claim 7, characterized in that, The detection chamber is provided with an installation groove (101), the cover plate (400) is embedded in the installation groove (101), and the second sealing colloid (500) is poured into the installation groove (101).

9. A fuel vapor pressure sensor according to claim 1, characterized in that, The testing station (600) is a ceramic plate, an aluminum substrate, or a PCB board.

10. A fuel vapor pressure sensor according to claim 1, characterized in that, The sealing component (401) is rivet-shaped.

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