Capacitance type multi-section liquid level sensor

Abstract

The utility model relates to the technical field of liquid level sensors, and discloses a capacitive multi-section liquid level sensor which comprises a main shell, a main rod and a bottom fixing piece arranged on the lower side of the main rod. A plurality of upper supporting rods and a plurality of lower supporting rods which are respectively used for supporting the plurality of sensing assemblies are arranged on the bottom fixing piece; the plurality of sensing assemblies comprise an upper metal sensing disc, a metal guide column and a lower metal sensing disc which are sequentially arranged between the upper supporting rod and the lower supporting rod, and are used for generating capacitance change signals when liquid approaches. According to the utility model, the plurality of vertically arranged sensing assemblies and the upper and lower supporting rods are used for supporting, and the main shell and the main rod are hermetically connected, so that the structure is compact, and the installation is convenient. The metal induction disc and the guide column are combined to form a plurality of independent induction nodes, capacitance response signals are triggered step by step according to the height change of the liquid level, the liquid level is accurately measured, and the sensor is widely applied to fine liquid level control and detection of equipment such as industrial containers and storage tanks.

Description

Technical Field

[0001] This utility model relates to the field of liquid level sensor technology, and in particular to a capacitive multi-segment liquid level sensor. Background Technology

[0002] With the continuous evolution of smart home technology, liquid level detection technology is being increasingly widely used in terminal devices such as water tank control systems, electric water heaters, and smart toilets. To improve system safety and operational stability, especially in the context of achieving electronic and intelligent control of equipment, higher requirements are being placed on liquid level monitoring accuracy, response speed, and multi-segment recognition capabilities. Particularly in mid-to-high-end home appliances and industrial fluid control equipment, preventing liquid spills that could cause short circuits, damage to electrical components, or even electrical leakage is crucial for improving product safety and reliability. To address these needs, a capacitive multi-segment liquid level sensor has emerged. It not only effectively improves liquid level detection accuracy but also possesses good environmental adaptability and structural versatility, making it suitable for precise liquid level sensing scenarios inside various liquid containers.

[0003] Existing liquid level detection technologies mainly include electrode-type liquid level sensors and photoelectric liquid level sensors. Electrode-type liquid level sensors rely on the conductivity between the liquid and the metal electrode to sense the liquid level. They are simple in structure, low in cost, and widely used in traditional water tanks. However, as impurities, minerals, and organic matter accumulate in the water, scale easily forms on the electrode surface, increasing the contact resistance between the electrode and the water, ultimately leading to conductivity failure or misjudgment of the liquid level. Photoelectric liquid level sensors, on the other hand, achieve liquid level recognition through the refraction and reflection principles of the liquid. They have a faster response speed and moderate anti-interference ability, but their power consumption is relatively high, and they also suffer from misjudgment due to scale adhering to the sensor surface. In addition, these sensors are mostly single-point detection structures, making it difficult to simultaneously recognize and determine multiple water levels in real time, which is not conducive to deep adaptation to precise control scenarios.

[0004] However, existing technologies still suffer from problems such as loose structure, low integration, and few response nodes in practical applications. In particular, when implementing multi-segment liquid level detection, it is impossible to complete the independent identification and capacitive response of multiple liquid level nodes through an integrated structure. This makes the system installation complex and the detection accuracy low, making it difficult to meet the comprehensive requirements of mid-to-high-end intelligent equipment or industrial containers for step-by-step control of liquid level, fluctuation error tolerance, and real-time feedback. Therefore, a capacitive multi-segment liquid level sensor is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a capacitive multi-segment liquid level sensor, which aims to improve the problem in the prior art that when realizing multi-segment liquid level detection, it is impossible to complete the independent identification and capacitive response of multiple liquid level nodes through an integrated structure, resulting in complex system installation and low detection accuracy.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a capacitive multi-segment liquid level sensor, comprising:

[0007] The main housing, the main rod, and the bottom fasteners located on the underside of the main rod;

[0008] The bottom fastener is provided with a pair of upper support rods and lower support rods for supporting multiple sensing components.

[0009] The plurality of sensing components include an upper metal sensing disk, a metal guide post, and a lower metal sensing disk sequentially disposed between the upper support rod and the lower support rod, for generating a capacitance change signal when the liquid approaches;

[0010] The multiple sensing components are electrically connected to terminals via wiring harnesses to achieve independent detection of multiple liquid levels;

[0011] The bottom of the main rod is provided with a protrusion for fixing and installing the bottom fastener. The main housing and the main rod are sealed together by sealing gaskets, screws and nuts.

[0012] Furthermore, each of the inner walls of the multiple upper metal sensing discs is fixedly connected with a sealing ring, and the inner walls of the multiple sealing rings abut against the outer wall of the upper support rod.

[0013] Furthermore, the upper metal sensing disk and the lower metal sensing disk are located at both ends of the metal guide post.

[0014] Furthermore, one side of the protrusion is fixedly connected to the lower side of the main rod, and the outer wall of the protrusion is disposed through a slot inside the bottom fastener.

[0015] Furthermore, the lower end of the screw is fixedly connected to the upper end of the main rod, and the outer wall of the screw is disposed inside the main housing.

[0016] Furthermore, the inner wall of the nut is threaded to the outer wall of the screw, and the lower surface of the nut abuts against the bottom of the inner wall of the main housing.

[0017] Furthermore, multiple upper support rods are sleeved on the upper side of the upper metal induction disk, and the outer wall of the wire harness is disposed through the interior of the upper support rods.

[0018] Furthermore, multiple sets of sensing components are arranged side-by-side and longitudinally spaced on the bottom firmware.

[0019] This utility model has the following beneficial effects:

[0020] 1. In this utility model, multiple sensing components are vertically mounted on the bottom fixture, supported by upper and lower support rods, and combined with the sealed connection between the main housing and the main rod, resulting in a compact and reasonable overall structure that is easy to install. Each metal sensing disc and metal guide post forms multiple independent sensing nodes, which can trigger capacitive response signals step by step according to changes in liquid level, thereby achieving multi-segment accurate measurement of liquid level. This sensor is suitable for fine liquid level control scenarios, and is particularly suitable for detecting different liquid level segments in industrial containers, storage tanks, and other equipment.

[0021] 2. In this utility model, by setting a sealing ring on the inner wall of the metal induction disk and abutting the sealing ring against the outer wall of the support rod, the structural stability and protective sealing performance are further improved, and the service life of the sensor is extended. Each sensing component is electrically connected to the terminal through a wire harness, realizing the independence of signal transmission and anti-interference capability, effectively improving the reliability of measurement. In addition, the wire harness passes through the inside of the support rod, avoiding external wire entanglement and interference, facilitating later maintenance, and having good engineering adaptability and field application safety. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a capacitive multi-segment liquid level sensor proposed in this utility model;

[0023] Figure 2 This is a schematic diagram of the main housing structure of a capacitive multi-segment liquid level sensor proposed in this utility model;

[0024] Figure 3 This is a cross-sectional schematic diagram of a capacitive multi-segment liquid level sensor proposed in this utility model.

[0025] Figure 4 This is a schematic diagram of the convex portion structure of a capacitive multi-segment liquid level sensor proposed in this utility model.

[0026] Figure 5 This is a schematic diagram of the metal guide post structure of a capacitive multi-segment liquid level sensor proposed in this utility model.

[0027] Figure 6 This is a schematic diagram of the sealing ring structure of a capacitive multi-segment liquid level sensor proposed in this utility model.

[0028] Legend:

[0029] 1. Main housing; 2. Main rod; 3. Protrusion; 4. Bottom fastener; 5. Upper support rod; 6. Lower support rod; 7. Wiring harness; 8. Upper metal sensing disk; 9. Metal guide post; 10. Lower metal sensing disk; 11. Terminal; 12. Sealing ring; 13. Sealing gasket; 14. Screw; 15. Nut. Detailed Implementation

[0030] 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.

[0031] Reference Figures 1-6This utility model provides an embodiment of a capacitive multi-segment liquid level sensor, comprising: a main housing 1, a main rod 2, and a bottom fastener 4 disposed on the lower side of the main rod 2; the main housing 1 provides a protective shell for the internal structure, preventing external environmental influences on the circuit and sensing elements; the main rod 2 serves as a longitudinal support component, penetrating and connecting the main housing 1 and the bottom fastener 4, serving as a fixed installation and conductive connection; the bottom fastener 4 provides a support platform for multiple sensing components and is used to fix the position of each segment of the liquid level sensing structure; the bottom fastener 4 is provided with a pair of upper support rods 5 and lower support rods 6 respectively for supporting multiple sensing components; the upper support rods 5 and lower support rods 6 serve as vertical connecting supports, respectively located at each sensing component. The upper and lower ends of the assembly ensure that the metal sensing disks and guide posts are arranged at predetermined intervals to prevent interference between sensing signals and enhance overall structural stability. Multiple sensing components include an upper metal sensing disk 8, a metal guide post 9, and a lower metal sensing disk 10, sequentially positioned between the upper support rod 5 and the lower support rod 6, used to generate capacitance change signals when liquid approaches. The upper metal sensing disk 8 and the lower metal sensing disk 10 together form a capacitance sensing interface to respond to changes in liquid level. The metal guide post 9 connects the two disks, serving as a conductor and support, and forms a capacitance loop with the processing circuit to effectively identify each level of liquid level change. The multiple sensing components are electrically connected to terminals 11 via wiring harness 7. To achieve independent detection of multiple liquid levels; the wiring harness 7 is used to transmit the capacitive signals generated by each sensing component, and the terminal 11 serves as a unified output interface for easy connection to external circuits, thereby enabling signal aggregation and independent reading among multiple sensing components; the bottom of the main rod 2 is provided with a protrusion 3 for fixing the bottom fastener 4, and the main housing 1 and the main rod 2 are sealed together by a sealing washer 13, screws 14 and nuts 15; the protrusion 3 serves as a limiting structure between the main rod 2 and the bottom fastener 4, ensuring accurate positioning during installation and preventing displacement from affecting sensing accuracy; the sealing washer 13 prevents liquid from seeping into the interior of the main housing 1, protecting the electrical connection safety; the screws 14 and nuts 15 serve as a fastening structure, ensuring that the main rod 2 and the main housing 1 are securely connected. The connection is reliable, with good durability and sealing performance; multiple upper metal sensing discs 8 are fixedly connected to the inner walls of sealing rings 12, and the inner walls of multiple sealing rings 12 abut against the outer wall of the upper support rod 5; the sealing rings 12 are used to improve the sealing performance between each metal sensing disc and the upper support rod 5, prevent water vapor from seeping into the sensing component and affecting the sensing accuracy, and at the same time increase the fixed stability of the sensing component; the upper metal sensing discs 8 and the lower metal sensing discs 10 are located at both ends of the metal guide post 9; this structure allows each group of sensing components to have an independent sensing electrode surface, ensuring that different liquid level segments can respond independently, avoiding signal interference and misjudgment; one side of the protrusion 3 is fixedly connected to the lower side of the main rod 2, and the outer wall of the protrusion 3 is set through the internal slot of the bottom fastener 4;Through the engagement of the slots, a stable positioning relationship is formed between the bottom fastener 4 and the main rod 2, preventing the components from becoming loose or misaligned due to liquid fluctuations or vibrations. The lower end of the screw 14 is fixedly connected to the upper end of the main rod 2, and the outer wall of the screw 14 penetrates the interior of the main housing 1. The inner wall of the nut 15 is threadedly connected to the outer wall of the screw 14, and the lower surface of the nut 15 abuts against the bottom of the inner wall of the main housing 1. This fastening structure is used to achieve a firm assembly between the main housing 1 and the main rod 2, and the threaded connection forms a high-strength structural fixation effect to prevent liquid penetration or component loosening. Multiple upper support rods 5 are sleeved on the upper metal sensing disk 8, and the outer wall of the wiring harness 7 penetrates the interior of the upper support rod 5. This design makes the wiring harness 7 more compact, preventing cable displacement due to liquid fluctuations or other external forces, and improving the overall wiring stability and space utilization efficiency of the components. Multiple sets of sensing components are arranged side by side and longitudinally spaced on the bottom fastener 4. Through the longitudinal separation design, each set of sensing components corresponds to different liquid levels, forming multiple independent detection points, improving detection coverage and resolution accuracy, and adapting to the dynamic changes in different liquid levels. ;

[0032] Specifically, by employing multiple sensing components vertically mounted on the bottom fixture 4, supported by upper and lower support rods 5 and 6, and combined with the sealed connection between the main housing 1 and the main rod 2, the overall structure is compact, reasonable, and easy to install. Multiple upper metal sensing disks 8, lower metal sensing disks 10, and metal guide posts 9 are combined to form multiple independent sensing nodes, which can trigger capacitive response signals step by step according to changes in liquid level, achieving multi-segment accurate measurement of liquid level. This sensor is suitable for fine liquid level control scenarios, and is particularly suitable for detecting different liquid level segments in industrial containers, storage tanks, and other equipment.

[0033] Working principle: When the device is needed, multiple upper metal sensing disks 8, lower metal sensing disks 10, and conductive metal guide posts 9 form multiple series sensing units. When the sensor is immersed in the liquid, the dielectric constant of the liquid is significantly higher than that of air. During the liquid level rise, the sensor components come into contact with each other in sequence, causing a significant change in the capacitance value of the corresponding sensing unit. The main control system collects the capacitance changes of each sensing component to determine whether the liquid level has reached the corresponding position, realizing fixed-point monitoring of multiple liquid levels. Since each group of sensing components is independently connected to terminal 11 through wiring harness 7, signal segment acquisition is achieved, avoiding the impact of single-point failure on the overall measurement accuracy. By arranging multiple groups of sensing components longitudinally side by side on the bottom firmware 4, the liquid level measurement accuracy can be adjusted according to the actual application. It has good modular expansion capability and industrial adaptability, ensuring the real-time performance and accuracy of liquid level monitoring.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A capacitive multi-segment liquid level sensor, characterized in that, include: The main housing (1), the main rod (2), and the bottom fastener (4) disposed on the lower side of the main rod (2); The bottom fastener (4) is provided with a pair of upper support rods (5) and lower support rods (6) for supporting multiple sensing components respectively; The plurality of sensing components include an upper metal sensing disk (8), a metal guide post (9) and a lower metal sensing disk (10) arranged sequentially between the upper support rod (5) and the lower support rod (6), for generating a capacitance change signal when the liquid approaches; The multiple sensing components are electrically connected to the terminals (11) via wiring harness (7) to achieve independent detection of multiple liquid levels; The bottom of the main rod (2) is provided with a protrusion (3) for fixing and installing the bottom fastener (4). The main housing (1) and the main rod (2) are sealed together by a sealing washer (13), a screw (14) and a nut (15).

2. The capacitive multi-segment liquid level sensor according to claim 1, characterized in that: Each of the upper metal induction discs (8) has a sealing ring (12) fixedly connected to its inner wall, and the inner walls of the sealing rings (12) abut against the outer wall of the upper support rod (5).

3. The capacitive multi-segment liquid level sensor according to claim 1, characterized in that: The upper metal sensing disk (8) and the lower metal sensing disk (10) are located at both ends of the metal guide post (9).

4. A capacitive multi-segment liquid level sensor according to claim 1, characterized in that: One side of the protrusion (3) is fixedly connected to the lower side of the main rod (2), and the outer wall of the protrusion (3) is inserted into the slot inside the bottom fastener (4).

5. A capacitive multi-segment liquid level sensor according to claim 1, characterized in that: The lower end of the screw (14) is fixedly connected to the upper end of the main rod (2), and the outer wall of the screw (14) is disposed inside the main housing (1).

6. A capacitive multi-segment liquid level sensor according to claim 1, characterized in that: The inner wall of the nut (15) is threaded to the outer wall of the screw (14), and the lower surface of the nut (15) abuts against the bottom of the inner wall of the main housing (1).

7. A capacitive multi-segment liquid level sensor according to claim 1, characterized in that: Multiple upper support rods (5) are sleeved on the upper metal induction disk (8), and the outer wall of the wire harness (7) is inserted through the interior of the upper support rods (5).

8. A capacitive multi-segment liquid level sensor according to claim 1, characterized in that: Multiple sets of sensing components are arranged side by side and longitudinally spaced on the bottom firmware (4).

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