tank pressure sensor

Abstract

The utility model provides a kind of oil tank pressure sensor, and oil tank pressure sensor includes shell and cover plate, cover plate is connected with shell and forms containing chamber, containing chamber is provided with circuit board and pressure chip, and pressure chip is penetrated in the through-hole of circuit board;Containing chamber has with the air inlet channel of circuit board separation, air inlet channel is communicated with outside atmosphere, and the upper surface of pressure chip is located in air inlet channel.The oil tank pressure sensor can realize the physical isolation between water vapor and oil gas and electrical components such as circuit board, greatly improves the service life of oil tank pressure sensor.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to an oil tank pressure sensor. Background Technology

[0002] The fuel tank pressure sensor is an important component of the automotive fuel system. It is used to detect pressure changes in the fuel tank, convert the pressure signal into an electrical signal, and transmit it to the vehicle's electronic control unit.

[0003] In practical use, the air inlet at the bottom of the fuel tank pressure sensor can be inserted into the fuel tank. The pressure inside the fuel tank is transmitted through the air inlet to the detection hole below the measuring chip inside the fuel tank pressure sensor. Atmospheric pressure is transmitted through the through hole above the cover plate and the waterproof membrane to the detection hole above the chip inside the fuel tank pressure sensor. After the chip detects the pressure above and below, it outputs a corresponding electrical signal according to the pressure difference between the upper and lower parts to detect the fuel tank pressure, which helps to detect fuel tank leaks in a timely manner.

[0004] Because existing fuel tank pressure sensors are typically located near the fuel tank, their operating environment often contains oil and gas. Furthermore, the waterproof membrane used in existing fuel tank pressure sensors cannot block all water vapor, let alone smaller oil and gas particles. Once water vapor and oil and gas enter the interior of the fuel tank pressure sensor, they corrode the internal circuit board and its components, as well as the electrical connections between the circuit board and the housing, significantly impacting the sensor's lifespan. Utility Model Content

[0005] The purpose of this invention is to provide a fuel tank pressure sensor that can achieve physical isolation between water vapor and oil vapor and electrical components such as circuit boards, thereby greatly improving the service life of the fuel tank pressure sensor.

[0006] To achieve the above objectives, this utility model provides a fuel tank pressure sensor, including a housing and a cover plate. The cover plate is connected to the housing to form a receiving chamber. A circuit board and a pressure chip are disposed in the receiving chamber. The pressure chip is disposed through a through hole in the circuit board. The receiving chamber has an air intake channel separated from the circuit board. The air intake channel is connected to the external atmosphere. The upper surface of the pressure chip is located in the air intake channel.

[0007] Optionally, the cover plate is provided with a first extension at a position opposite to the pressure chip. The first extension has an annular structure and a first through hole communicating with the external atmosphere. The first extension is sealed to the pressure chip, so that the upper surface of the pressure chip can contact the external atmosphere.

[0008] Optionally, the first extension is fixedly connected to the edge of the upper surface of the pressure chip, or the first extension is fixedly connected to the side of the pressure chip.

[0009] Optionally, the cover plate has a second extension on the side away from the pressure chip. The second extension has an annular structure and a second through hole that communicates with the external atmosphere. The second through hole communicates with the first through hole and forms the air intake channel. A waterproof and breathable membrane is provided at the end of the second extension away from the first extension.

[0010] Optionally, the first extension and the second extension are integrally formed with the cover plate.

[0011] Optionally, the tank pressure sensor further includes a protective cover, which is fixed to the second extension and can cover the waterproof and breathable membrane; there is a gap between the protective cover and the second extension.

[0012] Optionally, the inner side of the protective cover is fixed with a plurality of claws, which are spaced apart along the circumference of the protective cover, and the protective cover is fixed to the second extension by the claws.

[0013] Optionally, the housing is provided with a test medium channel at a position opposite to the pressure chip, and the edge of the pressure chip is sealed to the housing so that the lower surface of the pressure chip can contact the test medium.

[0014] Optionally, the pressure chip is bonded to the cover plate or the housing with sealant, or the pressure chip is fixed to the cover plate or the housing by welding.

[0015] Optionally, the housing insert is injection molded with a fisheye PIN pin, which is fixedly connected to the circuit board by inserting into a corresponding fixing hole on the circuit board.

[0016] This utility model provides a fuel tank pressure sensor. After the cover plate and housing are fixedly connected, the fuel tank pressure sensor can form an air intake channel that communicates with the external atmosphere. The air intake channel is isolated from the circuit board to achieve physical isolation between water vapor and oil vapor and electrical components such as the circuit board. This can prevent water vapor and / or oil vapor entering the air intake channel from corroding the circuit board, the components on the circuit board, and the electrical connection parts between the circuit board and the housing, and greatly improve the service life of the fuel tank pressure sensor.

[0017] Furthermore, the improved structure of the oil tank pressure sensor in this solution requires less modification to the product design and production line. It can improve the sealing effect of the oil tank pressure sensor while retaining most of the product design and production line equipment. Such a design can complete the product upgrade with a small cost investment, which has high economic benefits. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the circuit board and pressure chip in a preferred embodiment of the present invention;

[0019] Figure 2 This is a top view of the cover plate in a preferred embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the oil tank pressure sensor in a preferred embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the oil tank pressure sensor in another preferred embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the protective cover in a preferred embodiment of the present invention.

[0023] [The annotations in the attached figures are explained below]:

[0024] Circuit board 11; pressure chip 12; cover plate 2; first extension 21; second extension 22; housing 3; test medium channel 31; receiving chamber 4; air inlet channel 41; fisheye PIN needle 5; waterproof and breathable membrane 6; protective cover 7. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0026] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or a connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In the description of this utility model, "a plurality of" means at least two, such as two, three, or more.

[0028] The present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments. Unless otherwise specified, the following embodiments and features can complement or combine with each other.

[0029] like Figures 1-4 As shown, a preferred embodiment of this utility model provides a fuel tank pressure sensor, including a cover plate 2 and a housing 3. The cover plate 2 and housing 3 are connected to form a receiving chamber 4. A circuit board 11 and a pressure chip 12 are disposed within the receiving chamber 4, with the pressure chip 12 penetrating through a through-hole (not labeled) in the circuit board 11. The receiving chamber 4 has an air intake channel 41 separated from the circuit board 11, and the upper surface of the pressure chip 12 is located within the air intake channel 41. The air intake channel 41 communicates with the external atmosphere, thereby enabling the pressure chip 12 to detect atmospheric pressure. Furthermore, the air intake channel 41 can seal against water vapor and / or oil vapor in the atmosphere to prevent water vapor and / or oil vapor from corroding the circuit board 11.

[0030] In a specific example, the pressure chip 12 is T-shaped. When the pressure chip 12 is installed, the lower part of the pressure chip 12 passes through the through hole of the circuit board 11, and the upper part of the pressure chip 12 is fixed to the circuit board 11 by soldering, thereby fixing the pressure chip 12 on the circuit board 11.

[0031] The oil tank pressure sensor provided in this application can form an air intake channel 41 that communicates with the outside after the cover plate 2 and the housing 3 are fixedly connected. The air intake channel 41 is isolated from the circuit board 11 to achieve physical isolation between water vapor and oil vapor and electrical components such as the circuit board 11. This can prevent water vapor and / or oil vapor entering the air intake channel 41 from corroding the circuit board 11, the components on the circuit board 11, and the electrical connection parts between the circuit board 11 and the housing 3, which greatly improves the service life of the oil tank pressure sensor.

[0032] Furthermore, the improved structure of the oil tank pressure sensor in this solution requires less modification to the product design and production line. It can improve the sealing effect of the oil tank pressure sensor while retaining most of the product design and production line equipment. Such a design can complete the product upgrade with a small cost investment, which has high economic benefits.

[0033] Furthermore, the housing 3 is injection molded with a fisheye PIN 5, which is fixedly connected to the circuit board 11 by inserting into a corresponding fixing hole (not labeled) on the circuit board 11.

[0034] Reference Figures 1-3 As shown, a first extension 21 is provided on the cover plate 2 opposite to the pressure chip 12. The first extension 21 has an annular structure and a first through hole (not labeled) that connects to the external atmosphere. The first extension 21 is sealed to the pressure chip 12, so that the upper surface of the pressure chip 12 can contact the external atmosphere.

[0035] Preferably, the shape of the first extension 21 corresponds to the shape of the pressure chip 12. The first extension 21 can be configured as a square ring structure, a circular ring structure, or an elliptical ring structure, etc., depending on the shape of the pressure chip 12.

[0036] Specifically, the first extension 21 and the pressure chip 12 enclose each other to form an air intake channel 41. This arrangement can achieve absolute physical isolation between the oil tank pressure sensor and electrical components such as the circuit board 11, preventing water vapor or oil vapor from corroding the circuit board 11.

[0037] Reference Figure 3 As shown, in a specific example, the first extension 21 is fixedly connected to the edge of the upper surface of the pressure chip 12. At this time, the upper surface of the pressure chip 12 is placed in the air intake channel 41, and the pressure chip 12 can be used to detect the gas pressure in the air intake channel 41.

[0038] Reference Figure 4 As shown, in another specific example, the first extension 21 is fixedly connected to the side of the pressure chip 12. In this case, the pressure chip 12 is placed entirely in the air intake channel 41 to facilitate the detection of gas pressure within the air intake channel 41 by the pressure chip 12.

[0039] This application does not limit the connection method between the pressure chip 12 and the housing 3 or the cover plate 2. In one example, the pressure chip 12 is bonded to the cover plate 2 or the housing 3 by sealant. In another example, the pressure chip 12 is fixed to the cover plate 2 or the housing 3 by welding.

[0040] Specifically, the first extension 21 can be bonded to the pressure chip 12 with resin glue or silicone, that is, the sealant can be resin glue or silicone, but is not limited to this.

[0041] like Figure 3 and Figure 4 As shown, the cover plate 2 has a second extension 22 on the side opposite to the pressure chip 12. The second extension 22 has an annular structure and a second through hole (not labeled) connecting to the external atmosphere. The second through hole communicates with the first through hole to form an air intake channel 41. The second extension 22 is preferably connected to the first extension plate 21 and integrally formed. A waterproof and breathable membrane 6 is provided at the end of the second extension 22 away from the first extension 21. The waterproof and breathable membrane 6 can block most water vapor and / or oil vapor, but a small amount of water vapor and / or oil vapor may be able to pass through.

[0042] In a preferred embodiment, the first extension 21 and the second extension 22 are integrally formed with the cover plate 2. In other embodiments, the first extension 21 and the second extension 22 may be fixed below and above the cover plate 2, respectively.

[0043] Reference Figure 5 and combined Figure 2 The fuel tank pressure sensor also includes a protective cover 7, which is fixed to the second extension 22 and covers the waterproof and breathable membrane 6. There is a gap between the protective cover 7 and the second extension 22, and external air can enter the air intake channel 41 through the gap between the protective cover 7 and the second extension 22 and the waterproof and breathable membrane 6 in sequence, so that the pressure chip 12 can detect the atmospheric pressure.

[0044] In a preferred embodiment, a plurality of latches (not shown) are fixed to the inner side of the protective cover 7. The latches are spaced apart circumferentially along the protective cover 7. For example, the latches are spaced apart on the inner side of the outer edge of the protective cover 7. The protective cover 7 is fixed to the second extension 22 by the latches. In this case, there is a gap between adjacent latches between the protective cover 7 and the second extension 22.

[0045] Reference Figure 3 and Figure 4 As shown, a medium channel 31 is provided at the position opposite to the pressure chip 12 in the housing 3. The edge of the pressure chip 12 is sealed to the housing 3, so that the lower surface of the pressure chip 12 can contact the medium to be measured.

[0046] Furthermore, the test medium channel 31 is used to communicate with an oil tank (not shown) so that the pressure chip 12 can detect the oil and gas pressure in the oil tank. The housing 3 is used to seal with the pressure chip 12 to prevent water vapor and / or oil and gas from damaging the circuit board 11.

[0047] In actual use, the test medium channel 31 at the bottom of the housing 3 can be inserted into the oil tank. The oil and gas in the oil tank can enter the test medium channel 31. The pressure chip 12 can be used to detect the oil and gas pressure in the test medium channel 31, thereby monitoring the pressure change in the oil tank in real time and ensuring the safe operation of the vehicle.

[0048] More specifically, the fuel tank pressure sensor can directly acquire the pressure information of the fuel vapor inside the fuel tank through the pressure chip 12, so as to monitor the working status of the fuel system and determine whether there is a fuel leak. At the same time, the fuel tank pressure sensor can also detect atmospheric pressure as a reference standard through the pressure chip 12. After detecting the fuel vapor pressure and atmospheric pressure, the fuel tank pressure sensor compares the fuel vapor pressure with the atmospheric pressure and outputs corresponding electrical signals according to different pressure differences, thereby accurately calculating the actual pressure value inside the fuel tank and realizing real-time detection of the fuel vapor pressure inside the fuel tank.

[0049] This application isolates the circuit board 11 from the air intake channel 41 and the test medium channel 31 respectively. With this configuration, the oil and gas in the air intake channel 41 and the test medium channel 31 cannot enter the chamber containing the circuit board 11, so as to achieve absolute physical isolation between the circuit board 11 and water vapor and oil and gas.

[0050] In summary, this utility model provides a fuel tank pressure sensor. After the cover plate 2 and the housing 3 are fixedly connected, the fuel tank pressure sensor can form an air intake channel 41 that communicates with the external atmosphere. The air intake channel 41 is isolated from the circuit board 11 to achieve physical isolation between water vapor and oil vapor and electrical components such as the circuit board 11. This can prevent water vapor and / or oil vapor entering the air intake channel 41 from corroding the circuit board 11, the components on the circuit board 11, and the electrical connection parts (such as the fisheye PIN pin 5) between the circuit board 11 and the housing 3. In this way, physical isolation between water vapor and oil vapor and electrical components such as the circuit board 11 can be achieved, which greatly improves the service life of the fuel tank pressure sensor.

[0051] Furthermore, the improved structure of the oil tank pressure sensor in this solution requires less modification to the product design and production line. It can improve the sealing effect of the oil tank pressure sensor while retaining most of the product design and production line equipment. Such a design can complete the product upgrade with a small cost investment, which has high economic benefits.

[0052] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the present utility model.

Claims

1. A fuel tank pressure sensor, characterized in that, The device includes a housing and a cover plate. The cover plate is connected to the housing to form a receiving chamber. A circuit board and a pressure chip are disposed in the receiving chamber. The pressure chip is disposed through a through hole in the circuit board. The receiving chamber has an air intake channel separated from the circuit board. The air intake channel is connected to the outside atmosphere. The upper surface of the pressure chip is located in the air intake channel.

2. The tank pressure sensor as described in claim 1, characterized in that, The cover plate is provided with a first extension at the position opposite to the pressure chip. The first extension is an annular structure and has a first through hole that connects to the external atmosphere. The first extension is sealed to the pressure chip so that the upper surface of the pressure chip can contact the external atmosphere.

3. The tank pressure sensor as described in claim 2, characterized in that, The first extension is fixedly connected to the edge of the upper surface of the pressure chip, or the first extension is fixedly connected to the side of the pressure chip.

4. The oil tank pressure sensor as described in claim 2, characterized in that, The cover plate has a second extension on the side away from the pressure chip. The second extension has an annular structure and a second through hole that connects to the external atmosphere. The second through hole communicates with the first through hole and forms the air intake channel. A waterproof and breathable membrane is provided at the end of the second extension away from the first extension.

5. The oil tank pressure sensor as described in claim 4, characterized in that, The first extension and the second extension are integrally formed with the cover plate.

6. The tank pressure sensor as described in claim 4, characterized in that, It also includes a protective cover, which is fixed to the second extension and can cover the waterproof and breathable membrane; there is a gap between the protective cover and the second extension.

7. The tank pressure sensor as described in claim 6, characterized in that, Multiple claws are fixed to the inner side of the protective cover. The multiple claws are spaced apart along the circumference of the protective cover, and the protective cover is fixed to the second extension by the claws.

8. The tank pressure sensor as described in any one of claims 1 to 7, characterized in that, The housing has a test medium channel at the position opposite to the pressure chip, and the edge of the pressure chip is sealed to the housing so that the lower surface of the pressure chip can contact the test medium.

9. The tank pressure sensor as described in any one of claims 1 to 7, characterized in that, The pressure chip is bonded to the cover plate or the housing with sealant, or the pressure chip is fixed to the cover plate or the housing by welding.

10. The tank pressure sensor according to any one of claims 1 to 7, characterized in that, The housing insert is injection molded with a fisheye PIN pin, which is fixedly connected to the circuit board by being inserted into a corresponding fixing hole on the circuit board.

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