Arc-shaped plate capacitance lubricating oil liquid level sensor

Abstract

The utility model discloses an arc plate capacitance lubricating oil liquid level sensor which comprises a mounting flange, an arc sensing electrode plate and a fixing structure, the other end of the mounting flange is provided with the arc sensing electrode plate, and the arc sensing electrode plate is electrically connected with a measuring section insulated wire in a protective shell. One end of a compensation section insulated wire is installed on one side of the measuring section insulated wire, the other end of the compensation section insulated wire is electrically connected with a compensation section electrode plate, a shielding shell is installed on the periphery of the arc sensing electrode plate, and a power source contact pin is installed at the top end of the shielding shell. The problems that a traditional liquid level sensor mostly adopts a straight cylindrical capacitor structure, but in an oil tank, the measurement range of the straight cylindrical capacitor structure is usually limited by the geometric dimension of a detection rod, and under the condition that the fluctuation of the liquid level of lubricating oil is large or the shape of the lubricating oil tank is complex, a measurement blind area is prone to occurring are solved.

Description

Technical Field

[0001] This utility model relates to the field of liquid level sensor technology, specifically to an arc-shaped flat plate capacitive lubricating oil level sensor. Background Technology

[0002] In aero engines, the stability of the lubricating oil level is directly related to the engine's operational reliability and lifespan. Therefore, the performance of the level sensor is particularly important. The lubricating oil level sensor is a sensor that monitors the lubricating oil or lubricating oil level in the engine. It has the advantages of high measurement accuracy and its main function is to ensure that the equipment maintains a sufficient amount of oil under normal operating conditions by monitoring the lubricating oil level in real time, so as to prevent equipment damage and failure caused by poor lubrication.

[0003] Traditional liquid level sensors mostly use a straight cylindrical capacitor structure. However, in oil tanks, the measurement range of these straight cylindrical structures is usually limited by the geometry of the probe. When the lubricating oil level fluctuates greatly or the shape of the lubricating oil tank is complex, the problem of measurement blind zone is likely to occur.

[0004] To address the aforementioned issues, this application proposes an arc-shaped flat plate capacitive lubricating oil level sensor. Utility Model Content

[0005] To address the problems in related technologies, this utility model provides an arc-shaped flat plate capacitive lubricating oil level sensor. The arc-shaped structure can better fit the oil tank structure, increase the measurement range of lubricating oil level, and effectively avoid measurement blind spots.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows:

[0007] An arc-shaped planar capacitive lubricating oil level sensor includes a mounting flange, an arc-shaped sensing electrode plate, and a fixing structure. A protective housing is installed at one end of the mounting flange, and an arc-shaped sensing electrode plate is installed at the other end of the mounting flange. The arc-shaped sensing electrode plate is electrically connected to an insulated wire measuring section inside the protective housing. A power pin is installed at the top of the protective housing. A pair of arc-shaped sensing electrode plates are provided, and the two arc-shaped sensing electrode plates are connected and fixed together by the fixing structure.

[0008] As a further embodiment of this utility model, the fixing structure includes a bolt, which passes through two arc-shaped sensing electrode plates in sequence and is then fitted with a nut. Two washers are installed on the bolt between the two arc-shaped sensing electrode plates. The bolt, nut, and washers are all made of ceramic.

[0009] As a further embodiment of this utility model, one end of a compensation section insulated wire is installed on one side of the measuring section insulated wire, and the other end of the compensation section insulated wire is electrically connected to the compensation section electrode plate. The compensation section electrode plate is installed on the outer wall of the tail end of the arc-shaped sensing electrode plate by a fixing structure.

[0010] As a further embodiment of this utility model, the bolts in the fixing structure at the compensation section electrode plate on the outer wall of the tail end of the arc-shaped sensing electrode plate pass through the compensation section electrode plate and the arc-shaped sensing electrode plate in sequence.

[0011] As a further embodiment of this utility model, both the measuring section insulated wire and the compensation section insulated wire are connected to the circuit board inside the protective housing with the power pin, and the power pin is connected to the external signal processing module after passing through the protective housing.

[0012] As a further embodiment of this invention, a shielding shell is installed around the arc-shaped sensing electrode plate.

[0013] As a further embodiment of this invention, the shielding shell is made of a high-temperature resistant composite material.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This utility model has strong applicability. The arc-shaped sensing electrode plate fits the curved surface structure of the oil tank better, making it suitable for irregularly shaped oil tanks or narrow spaces. It also increases the measurement range of lubricating oil level. At the same time, the structure of the arc-shaped sensing electrode plate increases the effective contact area with the oil, improves the capacitance change rate, and makes it more sensitive to changes in liquid level, giving it the advantage of high sensitivity. Moreover, the arc-shaped sensing electrode plate can reach the bottom of the oil tank, so the oil output can be converted by the arc length, simplifying the calculation of signal conversion.

[0016] 2. This utility model is easy to manufacture. By simplifying the structure and reducing the number of components, manufacturing and maintenance costs can be reduced.

[0017] 3. This invention effectively shields external electromagnetic interference through its shielding shell, especially in the complex electromagnetic environment of aero-engines. This helps reduce the impact of interference signals on the capacitance measurement of the electrode plate, improving the measurement stability and accuracy of the sensor. Furthermore, it provides physical protection for the arc-shaped sensing electrode plate, preventing damage from impurities in the lubricating oil, vibration, or mechanical impact. Particularly in the high-temperature and high-pressure environment of aero-engines, the shielding shell can extend the service life of the arc-shaped sensing electrode plate.

[0018] 4. This utility model, by setting a compensation section electrode plate at the tail end of the arc-shaped sensing electrode plate, can effectively reduce the influence of temperature changes on the measurement results of the capacitive liquid level sensor through dielectric constant compensation, thereby increasing the accuracy of the measurement. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of an arc-shaped flat plate capacitive lubricating oil level sensor according to an embodiment of the present utility model;

[0021] Figure 2 This is a front view schematic diagram of an arc-shaped flat plate capacitive lubricating oil level sensor according to an embodiment of the present utility model;

[0022] Figure 3 This is a left-side view of an arc-shaped flat plate capacitive lubricating oil level sensor according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the BB cross-sectional structure of an arc-shaped flat plate capacitive lubricating oil level sensor according to an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the fixing structure of an arc-shaped flat plate capacitive lubricating oil level sensor according to an embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram of the arc-shaped sensing electrode plate and the shielding shell of an arc-shaped flat plate capacitive lubricating oil level sensor according to an embodiment of the present utility model.

[0026] Figure 7 This is a schematic diagram comparing the installation position of an arc-shaped flat plate capacitive lubricating oil level sensor in a lubricating oil tank according to an embodiment of the present invention with the installation position of an existing sensor.

[0027] Figure 8 This is a schematic diagram of the lubricating oil tank of an arc-shaped flat plate capacitive lubricating oil level sensor according to an embodiment of the present utility model;

[0028] Figure 9 This is a schematic diagram of the state of the uncompensated section electrode plate and shielding shell of an arc-shaped flat plate capacitive lubricating oil level sensor according to an embodiment of the present utility model.

[0029] In the picture:

[0030] 1. Mounting flange; 2. Arc-shaped sensing electrode plate; 3. Fixing structure; 31. Bolt; 32. Nut; 33. Washer; 4. Protective housing; 5. Insulated wire for measuring section; 6. Insulated wire for compensation section; 7. Electrode plate for compensation section; 8. Shielding housing; 9. Power pin. Detailed Implementation

[0031] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0032] According to an embodiment of the present invention, an arc-shaped flat plate capacitive lubricating oil level sensor is provided.

[0033] Please refer to the instruction manual appendix. Figure 1-9 According to an embodiment of the present invention, an arc-shaped flat plate capacitive lubricating oil level sensor includes a mounting flange 1, an arc-shaped sensing electrode plate 2, and a fixing structure 3. A protective housing 4 is installed at one end of the mounting flange 1, and an arc-shaped sensing electrode plate 2 is installed at the other end of the mounting flange 1. The arc-shaped sensing electrode plate 2 is electrically connected to a measuring section insulated wire 5 inside the protective housing 4. A power pin 9 is installed at the top of the protective housing 4. A pair of arc-shaped sensing electrode plates 2 are provided, and the two arc-shaped sensing electrode plates 2 are connected and fixed together by the fixing structure 3. The fixing structure 3 includes a bolt 31. The bolt 31 passes through the two arc-shaped sensing electrode plates 2 in sequence and is fitted with a nut 32. Two washers 33 are installed on the bolt 31 between the two arc-shaped sensing electrode plates 2. The bolt 31, nut 32, and washer 33 are all made of ceramic. This invention is simple to manufacture. By simplifying the structure and reducing the number of components, manufacturing and maintenance costs can be reduced. It is also highly applicable. The arc-shaped sensing electrode plate 2 fits the curved surface of the oil tank better, making it suitable for irregularly shaped oil tanks or confined spaces. It also increases the measurement range of lubricating oil level. At the same time, the structure of the arc-shaped sensing electrode plate 2 increases the effective contact area with the oil, improves the capacitance change rate, and makes it more sensitive to changes in liquid level, giving it the advantage of high sensitivity. Moreover, the arc-shaped sensing electrode plate 2 can reach the bottom of the oil tank, so the oil output can be converted by the arc length, simplifying the calculation of signal conversion.

[0034] In one embodiment, please refer to the appendix to the specification. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6As a further embodiment of this invention, one end of a compensation section insulated wire 6 is installed on one side of the measuring section insulated wire 5. The other end of the compensation section insulated wire 6 is electrically connected to the compensation section electrode plate 7. The compensation section electrode plate 7 is installed on the outer wall of the tail end of the arc-shaped sensing electrode plate 2 via a fixing structure 3. Bolts 31 in the fixing structure 3 at the compensation section electrode plate 7 on the outer wall of the tail end of the arc-shaped sensing electrode plate 2 pass through the compensation section electrode plate 7 and the arc-shaped sensing electrode plate 2 in sequence. Both the measuring section insulated wire 5 and the compensation section insulated wire 6 are connected to the circuit board inside the protective housing 4 via power pins 9, and the power pins 9 are connected to the external signal processing module after passing through the protective housing 4. By setting the compensation section electrode plate 7 at the tail end of the arc-shaped sensing electrode plate 2, the influence of temperature changes on the measurement results of the capacitive liquid level sensor can be effectively reduced through dielectric constant compensation, thereby increasing the accuracy of the measurement.

[0035] In one embodiment, please refer to the appendix to the specification. Figure 6 and Figure 7 As a further embodiment of this invention, a shielding shell 8 is installed around the arc-shaped sensing electrode plate 2. The shielding shell 8 is made of high-temperature resistant composite material. The shielding shell 8 can effectively shield external electromagnetic interference, especially in the complex electromagnetic environment of aero-engines. This helps to reduce the impact of interference signals on the capacitance measurement of the electrode plate, improve the measurement stability and accuracy of the sensor, and provide physical protection for the arc-shaped sensing electrode plate 2, preventing damage to the arc-shaped sensing electrode plate 2 caused by impurities in the lubricating oil, vibration, or mechanical impact. Especially in the high-temperature and high-pressure environment of aero-engines, the shielding shell 8 can extend the service life of the arc-shaped sensing electrode plate 2.

[0036] Workflow: When in use, first insert the arc-shaped sensing electrode plate 2 with the shielded shell 8 and the compensation section electrode plate 7 into the lubricating oil tank. Then, use bolts 31 to pass through the mounting flange 1 to connect it to the lubricating oil tank. Finally, connect the external signal processing module to the power connector 9.

[0037] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An arc-shaped flat plate capacitive lubricating oil level sensor, comprising a mounting flange (1), an arc-shaped sensing electrode plate (2), and a fixing structure (3), characterized in that: One end of the mounting flange (1) is fitted with a protective housing (4), and the other end of the mounting flange (1) is fitted with an arc-shaped sensing electrode plate (2). The arc-shaped sensing electrode plate (2) is electrically connected to the measuring section insulated wire (5) inside the protective housing (4). A power pin (9) is fitted at the top of the protective housing (4). A pair of arc-shaped sensing electrode plates (2) are provided, and the two arc-shaped sensing electrode plates (2) are connected and fixed by a fixing structure (3).

2. The arc-shaped flat plate capacitive lubricating oil level sensor according to claim 1, characterized in that: The fixing structure (3) includes a bolt (31), which passes through two arc-shaped sensing electrode plates (2) in sequence and is fitted with a nut (32). Two washers (33) are installed on the bolt (31) between the two arc-shaped sensing electrode plates (2). The bolt (31), nut (32) and washer (33) are all made of ceramic.

3. The arc-shaped flat plate capacitive lubricating oil level sensor according to claim 1, characterized in that: One end of the measuring section insulated wire (5) is installed on one side, and the other end of the compensation section insulated wire (6) is electrically connected to the compensation section electrode plate (7). The compensation section electrode plate (7) is installed on the outer wall of the tail end of the arc-shaped sensing electrode plate (2) through the fixing structure (3).

4. An arc-shaped flat plate capacitive lubricating oil level sensor according to claim 2 or 3, characterized in that: The bolts (31) in the fixing structure (3) at the compensation section electrode plate (7) on the outer wall of the tail end of the arc-shaped sensing electrode plate (2) pass through the compensation section electrode plate (7) and the arc-shaped sensing electrode plate (2) in sequence.

5. The arc-shaped flat plate capacitive lubricating oil level sensor according to claim 3, characterized in that: The measuring section insulated wire (5) and the compensation section insulated wire (6) are connected to the circuit board inside the protective housing (4) via the power pin (9), and the power pin (9) is connected to the external signal processing module after passing through the protective housing (4).

6. The arc-shaped flat plate capacitive lubricating oil level sensor according to claim 1, characterized in that: The arc-shaped sensing electrode plate (2) is surrounded by a shielding shell (8).

7. The arc-shaped flat plate capacitive lubricating oil level sensor according to claim 6, characterized in that: The shielding shell (8) is made of high-temperature resistant composite material.

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