A liquid level alarm device for solid-liquid mixtures

Abstract

This utility model discloses a liquid level alarm device for solid-liquid mixtures, including a cylinder, a first detection component, a second detection component, a third detection component, a control unit, and a buzzer. The cylinder consists of a first cylindrical section, a second cylindrical section, and a third cylindrical section, with the second and third cylindrical sections positioned below the first cylindrical section. The first detection component is located in the first cylindrical section and includes a liquid level float ring sleeved on the outside of the cylinder and a sensing plate placed inside the cavity, the two being magnetically coupled. The second detection component is located in the second cylindrical section and includes an ultrasonic transducer inside the cavity. The third detection component is located in the third cylindrical section and includes a group of capacitor electrodes protruding from the cylinder and a movable scraper group sleeved on its outside. The control unit is located in the third cylindrical section and electrically connected to each detection component. The buzzer is electrically connected to the control unit. This device achieves accurate monitoring and alarm of the liquid level of the solid-liquid mixture through multiple detection technologies, improving production safety and enabling convenient remote management.

Description

Technical Field

[0001] This utility model relates to the field of solid-liquid mixture production technology, and in particular to a liquid level alarm device for solid-liquid mixtures. Background Technology

[0002] In the production process of solid-liquid mixtures, liquid level monitoring is a crucial step in ensuring the stable operation of the process. Industries such as chemical and food processing commonly use storage tanks or reactors to handle solid-liquid mixtures, and the liquid level directly affects product quality and production safety. Currently, the industry's commonly used single-point liquid level detection technologies, such as mechanical floats, ultrasonic sensors, or capacitive sensors, have significant limitations in practical applications. Due to the complex characteristics of solid-liquid mixtures, such as large viscosity variations and uneven solid phase distribution, sensors based on a single detection principle often struggle to adapt to measurement needs under different operating conditions, resulting in weak system anti-interference capabilities and insufficient long-term stability. Especially in production scenarios with changing material composition or fluctuating environmental conditions, traditional detection devices are prone to measurement errors, not only increasing the workload of manual re-inspection but also potentially causing safety hazards due to false alarms or missed alarms. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to propose a liquid level alarm device for solid-liquid mixtures, which achieves accurate liquid level monitoring and remote management through the coordinated cooperation of multiple detection technologies and intelligent alarm system, and solves the problems of high false alarm rate and insufficient reliability of traditional single sensors.

[0004] To achieve the aforementioned technical objectives, the technical solution adopted by this utility model is as follows: a liquid level alarm device for a solid-liquid mixture, comprising: a cylinder, a first detection component, a second detection component, a third detection component, a control unit, and a buzzer. The cylinder includes a first cylindrical section, a second cylindrical section, and a third cylindrical section, with the second and third cylindrical sections arranged opposite to each other and both positioned below the first cylindrical section. The first detection component is located in the first cylindrical section and includes a liquid level float ring and a sensing element. The liquid level float ring is sleeved on the outside of the first cylindrical section, and the sensing element is placed inside the cavity of the first cylindrical section. The sensing element is magnetically coupled to the liquid level float ring; the second detection component is located in the second cylinder and includes an ultrasonic transducer placed inside the cavity of the second cylinder; the third detection component is located in the third cylinder and includes a capacitor electrode group and a scraper group, with the capacitor electrode group protruding to the outside of the third cylinder and the scraper group sleeved on the outside of the capacitor electrode group and capable of reciprocating relative to the capacitor electrode group; the control unit is located in the third cylinder and is electrically connected to the first, second, and third detection components respectively; the buzzer is electrically connected to the control unit.

[0005] In some embodiments, the first detection component further includes: a first connecting bracket, a first limiting ring, and a second limiting ring. The first connecting bracket is disposed on the first cylindrical portion, and a sensing plate is provided at the end of the first connecting bracket. The sensing plate is movable relative to the inner sidewall of the first cylindrical portion. The first limiting ring is sleeved around the periphery of the first cylindrical portion and is disposed above the first cylindrical portion. The second limiting ring is sleeved around the periphery of the first cylindrical portion and is disposed below the first cylindrical portion.

[0006] In some embodiments, the first connecting bracket includes a first connecting segment and a second connecting segment, wherein the first connecting segment and the second connecting segment are V-shapedly hinged.

[0007] In some embodiments, the liquid level float ring has a hollow annular structure and a magnetic layer is provided inside the liquid level float ring.

[0008] In some embodiments, the second detection assembly further includes a sound guide tube and a reflector. The sound guide tube is in airtight contact with the ultrasonic transducer, and the other end of the sound guide tube extends outward from the second cylinder. The reflector is disposed at the outwardly extending end of the sound guide tube and does not enclose the sound guide tube.

[0009] In some embodiments, the reflector is positioned at a 45-degree angle to the ultrasonic transducer.

[0010] In some embodiments, the second detection assembly further includes a second connecting bracket disposed on the second cylindrical portion, and an ultrasonic transducer is provided on the second connecting bracket.

[0011] In some embodiments, the capacitor electrode assembly includes a first electrode and a second electrode, the first electrode protruding to the outside of the third cylindrical portion; the second electrode protruding to the outside of the third cylindrical portion, the first electrode and the second electrode being disposed opposite to each other; the scraper assembly includes a scraper, the scraper having a first scraping hole and a second scraping hole, the first scraping hole being adapted to the first electrode, the second scraping hole being adapted to the second electrode, the scraper being made of an insulating material, and the scraper being reciprocating relative to the first electrode and the second electrode.

[0012] In some embodiments, the scraper assembly further includes a base, the base being aligned with the extending directions of the first electrode and the second electrode, and the central axis of the base being placed on the same reference plane as the central axis of the first electrode and the central axis of the second electrode, and the base being provided with a first groove; one end of the scraper is provided with a first protrusion, the first protrusion being adapted to the first groove.

[0013] In some embodiments, the scraper assembly further includes a roller disposed on the first protrusion, the roller being movable relative to the first groove.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention provides a liquid level alarm device for solid-liquid mixtures, including a cylinder, a first detection component, a second detection component, a third detection component, a control unit, and a buzzer. The cylinder is composed of a first cylinder section, a second cylinder section, and a third cylinder section, with the second and third cylinder sections positioned opposite each other below the first cylinder section; the first detection component is located in the first cylinder section and includes a liquid level float ring sleeved on the outside of the cylinder and a sensing plate placed inside the cavity, the two being magnetically coupled; the second detection component is located in the second cylinder section and includes an ultrasonic transducer inside the cavity; the third detection component is located in the third cylinder section and includes a capacitor electrode group protruding from the cylinder and a movable scraper group sleeved on its outside; the control unit is located in the third cylinder section and is electrically connected to each detection component, and the buzzer is electrically connected to the control unit. This device achieves accurate monitoring and alarm of the liquid level of solid-liquid mixtures through multiple detection technologies, improving production safety and realizing the convenience of remote management. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0016] Figure 1 This is a schematic diagram of the specific structure of the liquid level alarm device described in the specific implementation method;

[0017] Figure 2 This is a schematic diagram of the specific structure of the liquid level float ring described in the specific implementation method;

[0018] Figure 3 This is a schematic diagram of the specific structure of the second detection component in a specific implementation method;

[0019] Figure 4 This is a schematic diagram of the specific structure of the third detection component described in the specific implementation method;

[0020] Figure 5 This is a top view of the scraper assembly described in the specific implementation method.

[0021] The attached figures are labeled as follows:

[0022] 1. Cylinder body;

[0023] 11. First cylindrical section;

[0024] 12. Second cylindrical section;

[0025] 13. Third cylindrical section;

[0026] 2. First detection component;

[0027] 21. Liquid level float ring;

[0028] 22. Sensor sheet;

[0029] 23. First connecting bracket;

[0030] 24. First limiting ring;

[0031] 25. Second limiting ring;

[0032] 3. Second detection component;

[0033] 31. Ultrasonic transducer;

[0034] 32. Sound guide tube;

[0035] 33. Reflector;

[0036] 34. Second connecting bracket;

[0037] 4. Third detection component;

[0038] 41. First electrode;

[0039] 42. Second electrode;

[0040] 43. Scraper assembly;

[0041] 431. Scraper;

[0042] 432. First scraping hole;

[0043] 433. Second scraping hole;

[0044] 434. Base;

[0045] 435. First chute;

[0046] 436. First protrusion. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are only for illustrating the present invention and do not limit the scope of the present invention. Similarly, the following embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0048] Please see Figures 1 to 5This embodiment provides a liquid level alarm device for a solid-liquid mixture, including: a cylinder 1, a first detection component 2, a second detection component 3, a third detection component 4, a control unit, and a buzzer. The cylinder 1 includes a first cylinder section 11, a second cylinder section 12, and a third cylinder section 13. The second cylinder section 12 and the third cylinder section 13 are arranged opposite to each other, and both the second cylinder section 12 and the third cylinder section 13 are located below the first cylinder section 11. The first detection component 2 is disposed in the first cylinder section 11 and includes a liquid level float ring 21 and a sensing element 22. The liquid level float ring 21 is sleeved on the outside of the first cylinder section 11, and the sensing element 22 is placed inside the cavity of the first cylinder section 11. The system is magnetically coupled to the level float ring 21; the second detection component 3 is disposed in the second cylindrical section 12, and includes an ultrasonic transducer 31, which is placed inside the cavity of the second cylindrical section 12; the third detection component 4 is disposed in the third cylindrical section 13, and includes a capacitor electrode group and a scraper group 43, with the capacitor electrode group protruding to the outside of the third cylindrical section 13 and the scraper group 43 sleeved on the outside of the capacitor electrode group and capable of reciprocating relative to the capacitor electrode group; the control unit is disposed in the third cylindrical section 13, and the control unit is electrically connected to the first detection component 2, the second detection component 3, and the third detection component 4 respectively; the buzzer is electrically connected to the control unit.

[0049] In this embodiment, the cylinder 1 adopts a segmented structure. The first cylinder 11 is used to install the buoyancy detection component, namely the first detection component 2, whose liquid level float ring 21 drives the sensing plate 22 in the cavity to generate signal changes through magnetic coupling. The ultrasonic transducer 31 in the second cylinder 12 realizes non-contact measurement by transmitting and receiving sound waves. The capacitor electrode group in the third cylinder 13 adopts an exposed design, and the reciprocating motion of the scraper group 43 can effectively remove the deposits on the electrode surface. The control unit drives the buzzer to issue an alarm by comprehensively analyzing the three detection signals. Among them, the floating change of the liquid level float ring 21 reflects the liquid level height, the ultrasonic transducer 31 detects the position of the medium interface, and the capacitor electrode group identifies the material state through the change of dielectric constant. The three detection methods form a complementary verification.

[0050] The working principle of this device can be understood as follows: when the liquid level of the solid-liquid mixture changes, the liquid level float ring 21 floats with the liquid surface and changes the signal of the sensing plate 22 through magnetic coupling. At the same time, the sound waves emitted by the ultrasonic transducer 31 are reflected by the material to form an echo signal, and the capacitor electrode group generates a corresponding electrical signal by detecting changes in the dielectric properties of the medium. The control unit performs weighted analysis and logical judgment on the three signals, and triggers a buzzer alarm when the detection result exceeds the set threshold.

[0051] This embodiment effectively overcomes the limitations of a single detection method under complex working conditions through the synergistic effect of multiple sensing technologies, significantly improving detection reliability. Combined with the dynamic cleaning function of the scraper assembly 43, it ensures the long-term stable operation of the capacitive sensor in viscous media, while the split-type cylinder 1 achieves physical isolation between the sensors, avoiding mutual interference. This not only improves detection accuracy but also simplifies the installation and maintenance process, making it particularly suitable for solid-liquid mixture level monitoring needs in chemical, food processing, and other fields.

[0052] In some embodiments, the first detection component 2 further includes: a first connecting bracket 23, a first limiting ring 24, and a second limiting ring 25. The first connecting bracket 23 is disposed on the first cylindrical portion 11, and a sensing plate 22 is provided at the end of the first connecting bracket 23. The sensing plate 22 is movable relative to the inner sidewall of the first cylindrical portion 11. The first limiting ring 24 is sleeved on the periphery of the first cylindrical portion 11 and is disposed above the first cylindrical portion 11. The second limiting ring 25 is sleeved on the periphery of the first cylindrical portion 11 and is disposed below the first cylindrical portion 11.

[0053] In this embodiment, the first connecting bracket 23 is used to fix the sensing element 22 and guide it to move along the inner wall of the first cylindrical portion 11, ensuring that the sensing element 22 and the liquid level float ring 21 maintain a stable magnetic coupling relationship. The first limiting ring 24 and the second limiting ring 25 are respectively disposed at the upper and lower ends of the first cylindrical portion 11 to limit the movement range of the liquid level float ring 21 and prevent it from leaving the working area. Specifically, the first limiting ring 24 prevents the float ring from overflowing when the liquid level is too high, while the second limiting ring 25 prevents the float ring from leaving the sensing area when the liquid level is too low. Preferably, the limiting rings are made of wear-resistant material to withstand long-term contact friction of the liquid level float ring 21.

[0054] In this embodiment, the first connecting bracket 23 ensures the precise positioning of the sensing element 22, and the mechanical constraint system formed by the upper and lower limit rings keeps the liquid level float ring 21 within the effective detection range. When the liquid level changes, the float ring drives the sensing element 22 to move within the limited range, which not only ensures the continuity of the detection signal, but also avoids damage to the mechanical structure due to overtravel, significantly improving the reliability and service life of the buoyancy detection component, and is particularly suitable for working environments with frequent liquid level fluctuations.

[0055] In some embodiments, the first connecting bracket 23 includes a first connecting segment and a second connecting segment, wherein the first connecting segment and the second connecting segment are V-shapedly hinged.

[0056] In this embodiment, the first connecting bracket 23 adopts a V-shaped hinge structure, with its first connecting section and second connecting section forming a rotatable connection through the hinge point. This structure allows the sensing element 22 to adaptively adjust its angle as the liquid level float ring 21 floats, ensuring that the magnetic coupling effect is always at its optimal state. Preferably, the hinge part is made of stainless steel, which ensures both structural strength and good corrosion resistance. The V-shaped structure allows the first connecting bracket 23 to achieve a larger adjustment range within a limited space, while maintaining a compact overall size.

[0057] This embodiment utilizes a V-shaped hinged first connecting bracket 23 to enable the sensing element 22 to adapt to the movement trajectory of the liquid level float ring 21, effectively solving the magnetic coupling misalignment problem caused by traditional rigid connections. When the liquid level changes, the first and second connecting sections can rotate relative to each other, ensuring that the sensing element 22 always maintains the optimal coupling distance with the liquid level float ring 21. This ensures the stability and accuracy of the detection signal, not only improving the reliability of liquid level detection but also reducing wear on the mechanical structure and extending the service life of the equipment. It is particularly suitable for working environments with fluctuations or turbulence.

[0058] In some embodiments, the liquid level float ring 21 has a hollow annular structure, and a magnetic layer is provided inside the liquid level float ring 21.

[0059] In this embodiment, the liquid level float ring 21 adopts a hollow annular structure, and its internal cavity provides buoyancy, allowing the float ring to rise and fall with the liquid level. A magnetic layer is disposed on the inner peripheral wall of the liquid level float ring 21 to form a magnetic coupling with the induction plate 22. Preferably, the magnetic layer is made of permanent magnet material and is uniformly distributed along the circumference to ensure that a stable magnetic field change can be generated at any liquid level; the annular structure gives the float ring better stability in the liquid and reduces deflection or tilting caused by liquid flow.

[0060] This embodiment achieves sensitive liquid level tracking through a hollow circular floating ring 21. The non-contact coupling between the built-in magnetic layer and the sensing element 22 avoids the wear problems of traditional mechanical connections. When the liquid level changes, the floating ring moves with the liquid surface, causing the magnetic layer to shift. The sensing element 22 detects the change in magnetic field and converts it into an electrical signal, which not only ensures detection accuracy but also improves durability in corrosive media, making it particularly suitable for long-term stable monitoring in harsh working conditions such as chemical plants.

[0061] In some embodiments, the second detection component 3 further includes a sound guide tube 32 and a reflector plate 33. The sound guide tube 32 is in airtight contact with the ultrasonic transducer 31, and the other end of the sound guide tube 32 extends outward to the second cylinder portion 12. The reflector plate 33 is disposed at the outwardly extending end of the sound guide tube 32, and the reflector plate 33 does not enclose the sound guide tube 32.

[0062] In this embodiment, the sound guide tube 32 is used to transmit ultrasonic signals. One end of it is airtightly connected to the ultrasonic transducer 31 to ensure sound wave transmission efficiency, while the other end extends to the outside of the second tube portion 12 to form an open end. The reflector plate 33 is disposed on the outside of the extended end of the sound guide tube 32 and adopts a partially enclosed structure to ensure effective reflection of sound waves while avoiding complete blockage of the sound guide tube 32 channel. Preferably, the sound guide tube 32 adopts a corrugated tube structure, which maintains sound wave transmission performance and has telescopic adjustment capability. The surface of the reflector plate 33 is provided with anti-reflective texture to optimize the sound wave reflection effect.

[0063] In this embodiment, the ultrasonic signal is directionally transmitted to the detection area through the sound guide tube 32. The external reflector 33 causes secondary reflection of the sound waves when they encounter the medium, while maintaining the natural flow of the medium inside the sound guide tube 32. When the ultrasonic transducer 31 emits a signal, the sound wave is directionally propagated after being constrained by the sound guide tube 32, and part of the energy is reflected by the reflector 33 to form an echo signal. Accurate liquid level detection is achieved by measuring the time difference between transmission and reception. This embodiment solves the problem of easy clogging of the traditional built-in reflector 33, improves detection reliability, and is particularly suitable for viscous media or media containing solid particles, while simplifying the maintenance and cleaning process.

[0064] In some embodiments, the reflector 33 is positioned at a 45-degree angle to the ultrasonic transducer 31.

[0065] In this embodiment, the reflector 33 and the ultrasonic transducer 31 are positioned at a 45-degree angle, allowing the acoustic signal to reach the surface of the reflector 33 at the optimal incident angle. Preferably, the reflector 33 is made of stainless steel and laser-etched to form specific surface textures to optimize the acoustic reflection effect. The ultrasonic transducer 31 forms an acoustic path with the reflector 33 through the sound guide tube 32. The 45-degree angle ensures that the acoustic signal can be efficiently reflected back to the transducer, while avoiding multiple reflections and interference. This also causes the acoustic propagation path to intersect with the direction of medium flow, reducing the interference of medium flow on the detection signal.

[0066] This embodiment uses a reflector 33 positioned at a 45-degree angle to ensure a defined reflection path for the ultrasonic signal. When the sound wave emitted by the transducer is conducted through the sound guide tube 32, it strikes the reflector 33 at the optimal angle and returns along the same path. This not only improves signal reflection efficiency but also eliminates signal superposition interference that is common in traditional vertical reflection methods through geometric relationships, resulting in a clearer and more stable received signal. This embodiment significantly improves the accuracy and reliability of liquid level detection, making it particularly suitable for complex operating conditions with media flow or bubble interference. It also simplifies the complexity of the signal processing algorithm and improves the system response speed.

[0067] In some embodiments, the second detection component 3 further includes a second connecting bracket 34, which is disposed on the second cylindrical portion 12 and has an ultrasonic transducer 31.

[0068] In this embodiment, the second connecting bracket 34 is used to fix the ultrasonic transducer 31. It employs a rigid structural design to ensure the stability of the transducer's installation position. The second connecting bracket 34 is located in the top region of the second cylindrical section 12, forming a reliable mechanical connection with the cylindrical body 1. It is preferably made of stainless steel to balance strength and corrosion resistance. Preferably, the ultrasonic transducer 31 is mounted on the second connecting bracket 34 via shock-absorbing pads, which effectively isolates mechanical vibration interference and ensures an airtight connection between the ultrasonic transducer 31 and the sound guide tube 32. Furthermore, the second connecting bracket 34 has a wiring channel inside, facilitating the routing and protection of the transducer's signal lines.

[0069] In this embodiment, the ultrasonic transducer 31 is securely mounted at a designated position on the second cylindrical section 12 via the second connecting bracket 34, ensuring precise alignment between the emitting surface of the ultrasonic transducer 31 and the sound guide tube 32. When the system is operating, the rigid support of the second connecting bracket 34 prevents signal deviation caused by external vibrations. Simultaneously, its shock-absorbing design effectively absorbs mechanical vibrations generated during equipment operation, ensuring both the measurement accuracy of the ultrasonic detection system and improving its long-term reliability in industrial environments. This makes it particularly suitable for operating conditions with mechanical vibrations or temperature variations, providing a stable hardware foundation for liquid level detection.

[0070] In some embodiments, the capacitor electrode assembly includes a first electrode 41 and a second electrode 42. The first electrode 41 protrudes to the outside of the third cylindrical portion 13; the second electrode 42 protrudes to the outside of the third cylindrical portion 13, and the first electrode 41 and the second electrode 42 are disposed opposite to each other. The scraper assembly 43 includes a scraper 431, which is provided with a first scraping hole 432 and a second scraping hole 433. The first scraping hole 432 is adapted to the first electrode 41, and the second scraping hole 433 is adapted to the second electrode 42. The scraper 431 is made of insulating material and can reciprocate relative to the first electrode 41 and the second electrode 42.

[0071] In this embodiment, the capacitor electrode assembly consists of a first electrode 41 and a second electrode 42, both extending to the outside of the third cylindrical portion 13 and positioned opposite each other to form the electric field space required for capacitance detection. The first electrode 41 and the second electrode 42 are preferably made of corrosion-resistant conductive materials to ensure long-term stability in complex media environments. The scraper assembly 43 includes an insulating scraper 431 with first scraping holes 432 and second scraping holes 433 that precisely match the electrodes. The scraper 431 continuously cleans the electrode surface through reciprocating motion. Preferably, the scraper 431 is made of a self-lubricating material such as polytetrafluoroethylene (PTFE) to ensure cleaning effectiveness while reducing frictional wear.

[0072] This embodiment detects changes in the liquid level of a medium using relatively positioned capacitive electrodes. As the scraper 431 reciprocates, the edge of the scraper hole contacts the electrode surface and scrapes away any adhering substances, keeping the electrodes clean. This dynamic cleaning mechanism effectively solves the problem of traditional capacitive sensors being easily contaminated in viscous media, ensuring the long-term accuracy of capacitive detection. Simultaneously, the insulating scraper 431 avoids interference with the electric field during cleaning, enabling the system to operate stably under harsh conditions, significantly improving the reliability and lifespan of liquid level detection. It is particularly suitable for industrial scenarios involving viscous or corrosive media, such as chemical and food processing.

[0073] In some embodiments, the scraper assembly 43 further includes a base 434, the base 434 being aligned with the extending directions of the first electrode 41 and the second electrode 42, and the central axis of the base 434 being placed on the same reference plane as the central axis of the first electrode 41 and the central axis of the second electrode 42, and the base 434 being provided with a first groove 435; one end of the scraper 431 is provided with a first protrusion 436, and the first protrusion 436 is adapted to the first groove 435.

[0074] In this embodiment, the base 434 of the scraper assembly 43 is arranged along the extending direction of the first electrode 41 and the second electrode 42, wherein the axis is coplanar with the central axis of the first electrode 41 and the second electrode 42, forming a precise positioning reference. The base 434 is provided with a first groove 435 for guiding the linear movement of the scraper 431. A first protrusion 436 at one end of the scraper 431 precisely engages with the first groove 435 to ensure that the scraper 431 maintains a stable movement trajectory during reciprocating motion. Preferably, the base 434 is made of a wear-resistant alloy material, and the surface of the groove is hardened to improve its service life.

[0075] This embodiment utilizes the mating structure between the base 434 and the slide groove to provide precise guidance for the scraper 431. As the scraper 431 reciprocates along the first slide groove 435, the mating relationship between the first protrusion 436 and the first slide groove 435 ensures that the scraping hole remains optimally aligned with the electrode, making the cleaning action more precise and effective. This guiding mechanism not only improves cleaning reliability but also prevents electrode damage caused by scraper 431 misalignment, while reducing the load requirements of the drive mechanism. This embodiment significantly improves the long-term stability of the capacitive level sensor under harsh operating conditions, ensuring continuous cleanliness of the electrode surface and providing reliable hardware support for accurate level detection. It is particularly suitable for level monitoring scenarios involving high-viscosity or easily fouling media.

[0076] In some embodiments, the scraper assembly 43 further includes a roller disposed on the first protrusion 436, the roller being movable relative to the first groove 435.

[0077] In this embodiment, the roller is mounted on the first protrusion 436 and forms a rolling engagement with the first groove 435 of the base 434. Preferably, the roller is made of wear-resistant engineering plastic or ceramic material, and its outer circumferential surface and the contact surface with the groove are precision machined to ensure smooth movement. The roller is connected to the first protrusion 436 through a bearing structure to achieve low-friction rotation, transforming the original sliding friction into rolling friction, which significantly reduces the resistance when the scraper 431 moves.

[0078] This embodiment improves the smoothness and efficiency of scraper 431's movement within the first groove 435 by adding a roller structure. As scraper 431 reciprocates, the rollers roll along the first groove 435, significantly reducing motion resistance and component wear. This improvement reduces the power requirements of the drive mechanism and extends the service life of the scraper assembly 43, while ensuring the smoothness and reliability of the cleaning action. Especially in applications involving viscous media or high-frequency cleaning, it effectively prevents jamming, ensuring the capacitor electrodes remain clean and providing a more stable and reliable signal source for level detection, further enhancing the sensor's adaptability and durability under harsh conditions.

[0079] By adopting the above technical solutions, this utility model differs from existing technologies and has the following beneficial effects: The segmented structure of the cylinder 1 integrates three technologies: buoyancy detection, ultrasonic detection, and capacitance detection. Specifically, the magnetic coupling between the liquid level float ring 21 and the sensing plate 22 achieves buoyancy detection; the ultrasonic transducer 31, in conjunction with the sound guide tube 32 and reflector 33, achieves non-contact measurement; and the capacitance electrode group, in conjunction with the scraper group 43, achieves contact detection. These three detection methods mutually verify each other, significantly improving the reliability of liquid level detection. The control unit comprehensively analyzes the three detection signals, effectively avoiding the risk of misjudgment from a single detection method and ensuring alarm accuracy. The reciprocating motion of the scraper group 43 effectively removes deposits from the electrode surface, and the roller structure reduces movement resistance, ensuring the long-term stability of capacitance detection. The structure of the reflector 33 and the sound guide tube 32 avoids the clogging problem of traditional ultrasonic detection, and the 45-degree angle optimizes the sound wave reflection path. Each detection component achieves precise positioning and mechanical protection through structures such as the first limiting ring 24, the second limiting ring 25, the first connecting bracket 23, and the second connecting bracket 34, enabling the device to maintain stable operation even under complex working conditions. This technical solution balances detection accuracy and ease of maintenance, making it particularly suitable for solid-liquid mixture level monitoring needs in fields such as chemical and food processing.

[0080] The above description is only a part of the embodiments of this utility model, and does not limit the scope of protection of this utility model. Any equivalent device or equivalent process transformation made based on the content of this utility model specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this utility model.

Claims

1. A liquid level alarm device for a solid-liquid mixture, characterized in that, include: The cylindrical body includes a first cylindrical section, a second cylindrical section, and a third cylindrical section, wherein the second cylindrical section and the third cylindrical section are disposed opposite to each other, and both the second cylindrical section and the third cylindrical section are disposed below the first cylindrical section; A first detection component is disposed in the first cylindrical portion. The first detection component includes a liquid level float ring and a sensing plate. The liquid level float ring is sleeved on the outside of the first cylindrical portion, and the sensing plate is placed inside the cavity of the first cylindrical portion. The sensing plate is magnetically coupled to the liquid level float ring. A second detection component is disposed in the second cylindrical portion. The second detection component includes an ultrasonic transducer, which is placed inside the cavity of the second cylindrical portion. A third detection component is disposed in the third cylindrical portion. The third detection component includes a capacitor electrode group and a scraper group. The capacitor electrode group protrudes to the outside of the third cylindrical portion, and the scraper group is sleeved on the outside of the capacitor electrode group and can reciprocate relative to the capacitor electrode group. A control unit is disposed in the third cylindrical section, and the control unit is electrically connected to the first detection component, the second detection component, and the third detection component, respectively. A buzzer is electrically connected to the control unit.

2. The liquid level alarm device for solid-liquid mixture according to claim 1, characterized in that, The first detection component also includes: A first connecting bracket is disposed in the first cylindrical portion, and the sensing plate is provided at the end of the first connecting bracket. The sensing plate is movable relative to the inner wall of the first cylindrical portion. The first limiting ring is sleeved on the periphery of the first cylindrical part and positioned above the first cylindrical part; The second limiting ring is sleeved on the outer periphery of the first cylindrical part and positioned below the first cylindrical part.

3. The liquid level alarm device for solid-liquid mixture according to claim 2, characterized in that, The first connecting bracket includes a first connecting segment and a second connecting segment, wherein the first connecting segment and the second connecting segment are V-shapedly hinged.

4. The liquid level alarm device for solid-liquid mixture according to claim 1, characterized in that, The liquid level float ring has a hollow circular structure, and a magnetic layer is provided inside the liquid level float ring.

5. The liquid level alarm device for solid-liquid mixture according to claim 1, characterized in that, The second detection component also includes: A sound guide tube is airtightly connected to the ultrasonic transducer, and the other end of the sound guide tube extends outward into the second cylinder. A reflector is disposed at one end of the sound guide tube that extends outward, and the reflector does not enclose the sound guide tube.

6. The liquid level alarm device for solid-liquid mixture according to claim 5, characterized in that, The reflector is positioned at a 45-degree angle to the ultrasonic transducer.

7. The liquid level alarm device for solid-liquid mixture according to claim 1, characterized in that, The second detection component also includes: The second connecting bracket is disposed on the second cylindrical part, and the ultrasonic transducer is disposed on the second connecting bracket.

8. The liquid level alarm device for solid-liquid mixture according to claim 1, characterized in that, The capacitor electrode group includes: The first electrode protrudes to the outside of the third cylindrical portion; The second electrode protrudes to the outside of the third cylindrical portion, and the first electrode and the second electrode are disposed opposite to each other. The scraper assembly includes: The scraper has a first scraping hole and a second scraping hole. The first scraping hole is adapted to the first electrode, and the second scraping hole is adapted to the second electrode. The scraper is made of insulating material and can reciprocate relative to the first electrode and the second electrode.

9. The liquid level alarm device for solid-liquid mixture according to claim 8, characterized in that, The scraper assembly also includes: The base is aligned with the extending directions of the first electrode and the second electrode, and the central axis of the base is placed on the same reference plane as the central axis of the first electrode and the central axis of the second electrode. The base is provided with a first sliding groove. One end of the scraper is provided with a first protrusion, which is adapted to the first groove.

10. The liquid level alarm device for solid-liquid mixture according to claim 9, characterized in that, The scraper assembly also includes: A roller is disposed on the first protrusion, and the roller is movable relative to the first groove.

Images