An ultrasonic wave detecting unit of a storage tank liquid level detecting device

Abstract

The utility model discloses a kind of ultrasonic detection units of storage tank liquid level detection device, belong to ultrasonic measurement and detection technical field.The utility model includes shell, ultrasonic transducer being set in the shell inside, magnet base, magnet being housed in the magnet base, delay layer being set in the shell bottom and elastic matching layer being set on the surface of delay layer.Magnet and ultrasonic transducer are arranged side by side in shell, ultrasonic transducer mounting groove and magnet mounting groove are correspondingly provided in shell inside and outside, and the central axis of both is collinear.The utility model realizes quick installation and disassembly by magnet adsorption, using elastic matching layer is tightly combined with storage tank wall under the action of magnetic force, forms stable solid-state acoustic coupling channel, without using coupling agent, effectively improve signal transmission quality and measurement accuracy, compact structure, convenient integration.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic measurement and detection technology, specifically to an ultrasonic detection unit of a tank liquid level detection device. Background Technology

[0002] In the field of ultrasonic measurement for tank level detection, the traditional ultrasonic probe installation process has significant drawbacks. Currently, installing the probe requires applying a liquid coupling agent between the probe and the tank wall, and then using glue to permanently bond the probe to the bottom of the tank or the measurement point. This installation method is not only cumbersome and time-consuming, but the coupling agent also gradually evaporates and dries out when exposed to air for extended periods, leading to poor acoustic coupling between the probe and the tank wall. This, in turn, causes signal attenuation, decreased accuracy, and even measurement failure. Furthermore, traditional ultrasonic probes are typically large, making integration with main control equipment difficult and limiting their application in compact spaces or integrated intelligent devices. Utility Model Content

[0003] The purpose of this utility model is to provide an ultrasonic detection unit for a storage tank liquid level detection device. By arranging the magnet and the ultrasonic transducer side by side inside the housing, and opening ultrasonic transducer mounting slots and magnet mounting slots with the central axes coinciding on the housing, a delay layer is formed between the two slots. This solves the problems of traditional ultrasonic probe installation requiring the use of coupling agent and glue, easy attenuation of coupling effect, and large probe size making it difficult to integrate with the main control equipment.

[0004] This utility model is achieved through the following technical solution: This utility model is an ultrasonic detection unit for a storage tank liquid level detection device, including a shell, an ultrasonic transducer disposed inside the shell, a magnet base, a magnet housed in the magnet base, a delay layer disposed at the bottom of the shell, and an elastic matching layer disposed on the surface of the delay layer.

[0005] The magnet and the ultrasonic transducer are arranged side by side inside the housing. The housing has ultrasonic transducer mounting slots and magnet mounting slots on the inside and outside, respectively, and their central axes are on the same straight line.

[0006] The delay layer is formed between the ultrasonic transducer mounting slot and the magnet mounting slot.

[0007] Furthermore, the ultrasonic transducer is housed within the ultrasonic transducer mounting slot.

[0008] Furthermore, a protrusion is fixed at the edge of the ultrasonic transducer mounting slot, and a groove is formed on the protrusion.

[0009] Furthermore, the magnet holder is disposed within the magnet mounting slot.

[0010] Furthermore, the bottom of the outer casing is bent inward and is fitted with a cover plate, and the ultrasonic transducer terminals are electrically connected to wires.

[0011] This utility model has the following beneficial effects: 1. This utility model uses the magnetic attraction of magnets to directly adsorb and fix the detection unit to the tank wall, completely eliminating the tedious steps of applying coupling agent and using glue for bonding, realizing true "one-click" installation and disassembly, greatly improving installation efficiency and facilitating later maintenance and replacement.

[0012] 2. This utility model utilizes an elastic matching layer that is tightly compressed between the delay layer and the tank wall under the strong attraction of a magnet, effectively eliminating the air in between and forming a stable and reliable solid-state acoustic coupling channel. Since there is no need to use a couplant that dries out easily, the possibility of periodic maintenance due to couplant failure is fundamentally eliminated, greatly reducing the later maintenance cost, extending the service life of the equipment, and ensuring the high efficiency and stability of ultrasonic signal transmission, thereby realizing continuous and high-precision liquid level measurement.

[0013] 3. An innovative configuration in which ultrasonic transducers and magnets are arranged side-by-side within the housing breaks away from the traditional vertical stacking pattern. This layout not only effectively reduces the overall height of the unit, making the structure flatter and more compact, facilitating integration with the main control equipment, but also provides greater optimization space for the arrangement of internal components and acoustic path design.

[0014] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the ultrasonic testing unit; Figure 2 This is a schematic diagram of the bottom structure of the ultrasonic testing unit; Figure 3 This is one of the schematic diagrams of the exploded structure of an ultrasonic testing unit; Figure 4 This is the second schematic diagram of the exploded structure of the ultrasonic detection unit; Figure 5 This is a schematic diagram of the front cross-sectional structure showing the connection between the ultrasonic testing unit and the storage tank.

[0016] In the diagram: 1. Matching layer; 2. Magnet; 3. Magnet holder; 4. Delay layer; 5. Ultrasonic transducer; 6. Wire; 7. Housing; 8. Cover plate; 9. Protrusion; 10. Ultrasonic transducer mounting slot; 11. Magnet mounting slot; 12. Storage tank. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-5 This utility model provides a technical solution: an ultrasonic detection unit for a tank liquid level detection device, including a housing 7, an ultrasonic transducer 5 disposed inside the housing 7, a magnet base 3, a magnet 2 housed in the magnet base 3, a delay layer 4 disposed at the bottom of the housing 7, and an elastic matching layer 1 disposed on the surface of the delay layer 4.

[0019] Preferably, the matching layer 1 is made of silicone rubber, the magnet 2 is a neodymium iron boron permanent magnet, and the outer shell 7 and the delay layer 4 are formed by casting and curing epoxy resin composite material to optimize the sound energy transmission efficiency.

[0020] Magnet 2 and ultrasonic transducer 5 are arranged side by side inside housing 7. The terminals of ultrasonic transducer 5 are electrically connected to wires 6 for transmitting ultrasonic signals to external main control equipment. Ultrasonic transducer mounting slot 10 and magnet mounting slot 11 are respectively provided inside and outside housing 7, and their central axes are on the same straight line. Magnet seat 3 is set in magnet mounting slot 11, and magnet 2 is fixed in housing 7 by magnet seat 3. Delay layer 4 is formed between ultrasonic transducer mounting slot 10 and magnet mounting slot 11 and is fixed by casting curing or bonding. It is used to delay the propagation of ultrasonic signals and improve signal recognition accuracy. Ultrasonic transducer 5 is housed in ultrasonic transducer mounting slot 10 to ensure close contact with delay layer 4. Ultrasonic transducer 5 generates ultrasonic waves under the excitation of electrical signals. The ultrasonic waves first propagate in delay layer 4. The function of this delay layer is twofold: first, to protect the sensitive transducer chip; and second, to avoid interference of the emitted pulse on the initial echo signal by delaying the echo signal time, thereby improving the resolution and accuracy of close-range measurement. Subsequently, the ultrasound waves pass through the designed matching layer 1 via acoustic properties; like Figure 5 As shown, the acoustic impedance of the matching layer 1 is between the delay layer 4 or the ultrasonic transducer 5 and the outer wall of the storage tank 12, which plays the role of impedance transition. This can significantly reduce the reflection loss of ultrasonic waves at different medium interfaces, and allow more ultrasonic energy to be effectively transmitted to the outer wall of the storage tank 12.

[0021] The strong magnetic force generated by the built-in magnet 2 firmly attaches the entire detection unit to the bottom of the storage tank 12, which is usually made of steel. Under the action of magnetic attraction, the elastic matching layer 1 is tightly squeezed between the outer wall of the storage tank 12 and the delay layer 4, effectively eliminating the air in between. Air is a poor conductor of ultrasound, and its presence in large quantities will severely attenuate the signal. By physically squeezing out the air, a good sound wave transmission path that is close to "solid coupling" is formed between the matching layer 1 and the tank wall.

[0022] The ultrasonic waves transmitted to the outer wall of the storage tank 12 propagate along the tank wall in the form of transverse waves or surface waves. When they encounter the liquid surface, due to the huge difference in acoustic characteristics between the tank wall and air, and between the tank wall and liquid, the ultrasonic waves will be strongly reflected at the liquid surface. The reflected echo returns along the original path and is received by the ultrasonic transducer 5 and converted into an electrical signal. The main control unit calculates the time difference between the ultrasonic wave transmission and reception, and then multiplies it by the propagation speed of the ultrasonic wave in the tank wall material to calculate the distance from the probe to the liquid surface, and then calculates the liquid level height in the storage tank 12.

[0023] A protrusion 9 is fixed at the edge of the ultrasonic transducer mounting slot 10. A groove is provided on the protrusion 9 to assist in the connection of the wire harness of the wire 6. The bottom of the housing 7 is bent inward and is fitted with a cover plate 8. The cover plate 8 is used to close the bottom of the housing 7 and protect the internal components.

[0024] Align the bottom of the ultrasonic testing unit, i.e. the surface where the matching layer is located, with the preset measurement point on the bottom of the cleaned storage tank 12. Relying on the magnetic attraction of the magnet 2, the testing unit is automatically attracted and fixed on the outer wall of the storage tank 12. During this process, the matching layer 1 is squeezed and deformed to ensure seamless and tight contact with the tank wall.

[0025] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An ultrasonic detection unit for a tank liquid level detection device, characterized in that: Includes a housing (7), an ultrasonic transducer (5) disposed inside the housing (7), a magnet base (3), a magnet (2) housed in the magnet base (3), a delay layer (4) disposed at the bottom of the housing (7), and an elastic matching layer (1) disposed on the surface of the delay layer (4). The magnet (2) and the ultrasonic transducer (5) are arranged side by side inside the housing (7). The housing (7) has an ultrasonic transducer mounting slot (10) and a magnet mounting slot (11) on its inside and outside, respectively, and their central axes are on the same straight line. The delay layer (4) is formed between the ultrasonic transducer mounting groove (10) and the magnet mounting groove (11).

2. The ultrasonic detection unit of the tank liquid level detection device according to claim 1, characterized in that, The ultrasonic transducer (5) is housed in the ultrasonic transducer mounting slot (10).

3. The ultrasonic detection unit of the tank liquid level detection device according to claim 1, characterized in that, A protrusion (9) is fixed at the edge of the ultrasonic transducer mounting groove (10), and a groove is provided on the protrusion (9).

4. The ultrasonic detection unit of the tank liquid level detection device according to claim 1, characterized in that, The magnet holder (3) is disposed in the magnet mounting slot (11).

5. The ultrasonic detection unit of the tank liquid level detection device according to claim 1, characterized in that, The bottom of the outer shell (7) is bent inward and is fitted with a cover plate (8). The terminal of the ultrasonic transducer (5) is electrically connected to a wire (6).

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