Rolling type triggered liquid level sensor

Abstract

The utility model discloses a rolling type triggered liquid level sensor, which relates to the technical field of liquid level sensors, and comprises an outgoing line, a rocker arm, a pin shaft, a sensor base, a flexible circuit contact plate, a sealing adhesive and a thick film resistor substrate, the upper end of the thick-film resistor substrate is sealed and closed by the sealing mucilage glue, and a rolling mechanism is arranged on one side of the upper end of the thick-film resistor substrate and connected with the rocker arm in a matched mode; the liquid level sensor is triggered in a rolling mode. Through meshing transmission of the gear and the rack and rolling contact of the roller on the flexible circuit contact plate, friction loss is greatly reduced, and signal stability is improved; the flexible circuit contact plate, the sealing adhesive and the thick-film resistor substrate are seamlessly attached, so that deformation and sealant pulling are reduced, and the service life is prolonged; the dense tooth number design of the gear improves the walking precision and ensures the liquid level detection accuracy; the device is compact in overall structure, suitable for corrosive environments such as oil and high in reliability.

Description

Technical Field

[0001] This utility model relates to the field of liquid level sensor technology, specifically a rolling-triggered liquid level sensor. Background Technology

[0002] Existing liquid level sensors mostly employ sliding contact triggering, such as a float-driven rocker arm directly rubbing against the resistive element. Long-term use easily leads to wear of the flexible circuit contact plate and aging and failure of the sealant, affecting measurement accuracy and service life. In contrast, existing triggering methods, such as the one disclosed in Chinese invention patent CN203148528U, present a wear-free, high-lifespan, and high-reliability liquid level sensor. This sensor includes a rocker arm hinged to a sensor base via a pin, with contacts fixed on the rocker arm for electrical contact with the resistive element. The electrical signal from the contacts is transmitted through lead wires. The resistive element is printed and bonded to a thick-film resistor substrate, which is fixed to the sensor base. A flexible circuit contact plate is bonded to the thick-film resistor substrate using sealant, positioned above the resistive element. This method offers longer lifespan, higher reliability, more stable resistance output, less susceptibility to environmental influences, and better reliability. When the contacts contact the surface of the flexible circuit contact plate, pressure causes the surface to bend downwards, pulling the internal sealant on both sides. Over time, this can lead to peeling, affecting usability.

[0003] Therefore, there is an urgent need for a high-precision, long-life rolling liquid level sensor to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a rolling-triggered liquid level sensor, which solves the problem of stable and durable signal contact in liquid level sensors and improves the overall service life through the rolling mechanism.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a rolling trigger liquid level sensor, including a lead wire, a rocker arm, a pin, a sensor base, a flexible circuit contact plate, a sealing adhesive, and a thick film resistor substrate. The upper end of the thick film resistor substrate is fixed with the sealing adhesive, which seals the upper end of the thick film resistor substrate. A rolling mechanism is provided on one side of the upper end of the thick film resistor substrate. The rolling mechanism is adapted to and connected to the rocker arm. The rocker arm swings to drive the rolling mechanism to move. The contact end of the rolling mechanism makes rolling contact with the surface of the flexible circuit contact plate.

[0006] Furthermore: the rolling mechanism includes a gear, which is rotatably connected to the midpoint of the lower end of the rocker arm, and a rack is fixed to one side edge of the thick film resistor substrate near the gear, and the gear meshes with the rack.

[0007] Furthermore: Limiting plates are fixed on both sides of the rack, and strip-shaped sliding holes are provided on the limiting plates. The gear protrudes from both sides and is limited to slide within the strip-shaped sliding holes. A connecting rod is fixed to the outer end of the gear, and a roller is rotatably connected to the end of the connecting rod. The roller rolls in contact with the surface of the flexible circuit contact plate.

[0008] Furthermore: the gear meshes with the rack, the gear has a dense number of teeth, and the rack has a correspondingly matched number of teeth to improve walking accuracy.

[0009] Furthermore, the roller, connecting rod, and rocker arm are electrically connected, and the roller rolls in contact with the flexible circuit contact plate to stably transmit electrical signals.

[0010] Furthermore, the flexible circuit contact plate, the sealing adhesive, and the thick film resistor substrate are seamlessly bonded together, reducing deformation of the flexible circuit contact plate and pulling on the sealing adhesive.

[0011] This invention provides a rolling-triggered liquid level sensor. Compared with the prior art, it has the following advantages:

[0012] This rolling-triggered liquid level sensor utilizes a gear and rack meshing transmission, combined with the rolling contact of a roller on a flexible circuit contact plate, significantly reducing friction loss and improving signal stability. The flexible circuit contact plate, sealing adhesive, and thick-film resistor substrate are seamlessly bonded, reducing deformation and sealant pulling, thus extending service life. The dense gear tooth design improves travel accuracy and ensures accurate liquid level detection. The overall structure is compact, suitable for corrosive environments such as oil, and offers high reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the liquid level sensor structure of this utility model in plan view;

[0015] Figure 3 This is a schematic diagram of the flexible circuit board portion of this utility model;

[0016] Figure 4 This is a schematic diagram of the flexible circuit board portion of this utility model;

[0017] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle.

[0018] In the diagram: 1. Lead wire; 2. Rocker arm; 3. Pin; 4. Sensor base; 5. Flexible circuit contact plate; 6. Sealing adhesive; 7. Thick film resistor substrate; 8. Limiting plate; 9. Strip-shaped sliding hole; 10. Rack; 11. Gear; 12. Connecting rod; 13. Roller. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-5 This utility model provides a technical solution: a rolling-triggered liquid level sensor; specifically, it is composed of a lead wire 1, a rocker arm 2, a pin 3, a sensor base 4, a flexible circuit contact plate 5, a sealing adhesive 6, and a thick-film resistor substrate 7. The rocker arm 2, connected to an external float and a float ball, swings under the influence of the float ball and rotates via the pin 3. This is existing technology and will not be described in detail here. The thick-film resistor substrate 7 is fixed on the sensor base 4, and the sealing adhesive 6 is fixed to the upper end of the thick-film resistor substrate 7. The sealing adhesive 6 seals the upper end of the thick-film resistor substrate 7, thereby isolating the oil from the resistive element on the thick-film resistor substrate 7 during metering, improving its service life. A rolling mechanism is provided on one side of the upper end of the resistive substrate 7. The rolling mechanism is adapted to and connected to the rocker arm 2. The horizontal swing of the rocker arm 2 drives the rolling mechanism to move. The contact end of the rolling mechanism abuts against the surface of the flexible circuit contact plate 5. Unlike the prior art, the flexible circuit contact plate 5, the sealing adhesive 6 and the thick film resistive substrate 7 are seamlessly bonded. This reduces the flexible deformation of the flexible circuit contact plate 5, further reduces the pulling on the sealing adhesive 6, and further improves the service life. At the same time, the rolling mechanism rolls left and right on the flexible circuit contact plate 5 to contact the resistive sheet and generate a signal. In addition, the rolling method reduces the friction on the surface of the flexible circuit contact plate 5 and improves the service life.

[0021] The rolling mechanism includes a gear 11, which is rotatably connected to the lower midpoint of the rocker arm 2. A rack 10 is fixed to the edge of the thick film resistor substrate 7 near the gear 11. The gear 11 and the rack 10 are meshed together. Limiting plates 8 are fixed on both sides of the rack 10. The limiting plates 8 have strip-shaped sliding holes 9. The gear 11 protrudes from both sides and slides within the strip-shaped sliding holes 9. A connecting rod 12 is fixed to the outer end of the strip-shaped sliding hole 9. A roller 13 is rotatably connected to the lower end of the connecting rod 12. The roller 13 rolls on the surface of the flexible circuit contact plate 5. The rolling surface contacts the resistor sheet to generate an electrical signal, thereby achieving the indication effect.

[0022] The gear 11 meshes with the rack 10, and the gear 11 has a dense number of teeth, which is matched with the rack 10, thereby improving the accuracy of the gear 11's movement.

[0023] The roller 13 is electrically connected to the connecting rod 12 and the rocker arm 2, and the roller 13 can stably transmit and transmit electrical signals.

Claims

1. A rolling-triggered liquid level sensor, comprising a lead wire (1), a rocker arm (2), a pin (3), a sensor base (4), a flexible circuit contact plate (5), a sealing adhesive (6), and a thick-film resistor substrate (7), characterized in that: The upper end of the thick film resistor substrate (7) is fixed with a sealing adhesive (6), which seals the upper end of the thick film resistor substrate (7). A rolling mechanism is provided on one side of the upper end of the thick film resistor substrate (7). The rolling mechanism is adapted to and connected to the rocker arm (2). The rocker arm (2) swings to drive the rolling mechanism to move. The contact end of the rolling mechanism rolls into contact with the surface of the flexible circuit contact plate (5).

2. The rolling-triggered liquid level sensor according to claim 1, characterized in that: The rolling mechanism includes a gear (11), which is rotatably connected to the midpoint of the lower end of the rocker arm (2). A rack (10) is fixed on one side edge of the thick film resistor substrate (7) near the gear (11), and the gear (11) meshes with the rack (10).

3. The rolling-triggered liquid level sensor according to claim 2, characterized in that: Limiting plates (8) are fixed on both sides of the rack (10). A strip-shaped sliding hole (9) is provided on the limiting plate (8). The gear (11) is protruding on both sides and is limited to slide within the strip-shaped sliding hole (9). A connecting rod (12) is fixed on the outer end of the gear (11). A roller (13) is rotatably connected to the end of the connecting rod (12). The roller (13) rolls and contacts the surface of the flexible circuit contact plate (5).

4. The rolling-triggered liquid level sensor according to claim 3, characterized in that: The gear (11) meshes with the rack (10), the gear (11) has a dense number of teeth, and the number of racks (10) is matched accordingly to improve the walking accuracy.

5. The rolling-triggered liquid level sensor according to claim 3, characterized in that: The roller (13), connecting rod (12) and rocker arm (2) are electrically connected, and the roller (13) rolls to contact the flexible circuit contact plate (5) to stably transmit electrical signals.

6. The rolling-triggered liquid level sensor according to claim 2, characterized in that: The flexible circuit contact plate (5), the sealing adhesive (6), and the thick film resistor substrate (7) are seamlessly bonded together, reducing the deformation of the flexible circuit contact plate (5) and the pulling of the sealing adhesive (6).

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