Externally-attached liquid level detection sensor

Abstract

The utility model discloses an external pasting type liquid level detection sensor, and relates to the technical field of liquid level detection equipment, the external pasting type liquid level detection sensor comprises an outer shell, a probe and a magnetic attraction piece, the outer shell comprises a bottom shell and a face shell, the bottom shell is arranged on the face shell, and the bottom shell and the face shell define a containing cavity; the end face, deviating from the bottom shell, of the face shell is used for being connected with the outer bottom face of the metal container, the probe is arranged in the containing cavity and used for transmitting and receiving ultrasonic waves, the frequency range of the ultrasonic waves transmitted by the probe ranges from 2 Mhz to 5 Mhz, and the magnetic attraction part is arranged in the containing cavity and used for being attracted to the metal container. According to the technical scheme provided by the utility model, the problem of large installation limitation of the liquid level detection sensor can be solved.

Description

Technical Field

[0001] This utility model relates to the field of liquid level detection equipment technology, and in particular to an external liquid level detection sensor. Background Technology

[0002] Liquid level sensors are non-contact detection devices that use ultrasonic principles to detect liquid levels, and are widely used in industrial automation, environmental protection, water conservancy, and other fields. However, traditional liquid level sensors require installation in specific locations, presenting significant installation limitations.

[0003] Therefore, it is necessary to provide a new external liquid level detection sensor to solve the above-mentioned technical problems. Utility Model Content

[0004] The main purpose of this invention is to provide an external liquid level detection sensor, which aims to solve the problem of large installation limitations of existing liquid level detection sensors.

[0005] To achieve the above objectives, this utility model proposes an externally mounted liquid level detection sensor, comprising:

[0006] The outer shell includes a bottom shell and a top shell. The bottom shell is disposed on the top shell and surrounds the top shell to form an accommodating cavity. The end face of the top shell facing away from the bottom shell is used to connect with the outer bottom surface of a metal container.

[0007] The probe is disposed within the accommodating cavity and is used to emit and receive ultrasonic waves. The frequency range of the ultrasonic waves emitted by the probe is between 2 and 5 MHz.

[0008] A magnetic attractor is disposed within the accommodating cavity and is used to attract the metal container.

[0009] In one embodiment, the probe is a broadband piezoelectric ceramic transducer, and the frequency of the ultrasonic wave emitted by the probe is 2 MHz.

[0010] In one embodiment, the external liquid level detection sensor further includes a receiving cylinder disposed within the receiving cavity, with the closed end of the receiving cylinder exposed on the end face of the face shell away from the bottom shell, and the probe disposed at the closed end of the receiving cylinder.

[0011] In one embodiment, the face shell is provided with a receiving hole, the receiving cylinder passes through the receiving hole and is exposed on the end face of the face shell opposite to the bottom shell;

[0012] A first annular limiting block is provided in the receiving hole, and a second annular limiting block is provided in the receiving cylinder extending around it. The side of the first annular limiting block facing the bottom shell abuts against the side of the second annular limiting block away from the bottom shell.

[0013] In one embodiment, the magnetic suction element includes a magnet, and the number of magnets is multiple, with the multiple magnets evenly spaced apart in the accommodating cavity along the circumferential direction of the shell.

[0014] In one embodiment, an adhesive layer is provided on the end face of the outer shell away from the bottom shell. The adhesive layer is used to bond to the outer bottom surface of the metal container, and the adhesive layer is an epoxy resin component.

[0015] In one embodiment, the external liquid level detection sensor further includes a control circuit board disposed within the accommodating cavity. The probe is electrically connected to the control circuit board, and the probe has a signal transmission state and a signal reception state. The control circuit board is used to control the probe to switch between the signal transmission state and the signal reception state.

[0016] In one embodiment, the control circuit board is provided with a push switch, and the bottom shell is provided with a button at a position corresponding to the push switch, the button being able to abut against the push switch.

[0017] In one embodiment, the button is a transparent element.

[0018] In one embodiment, the face shell is provided with a guide groove and a slot that communicate with each other. The guide groove extends along the thickness direction of the face shell, and the slot extends along the circumferential direction of the face shell. The bottom shell is provided with a locking block, which passes through the guide groove and is locked into the slot.

[0019] The technical solution of this utility model limits the frequency of the ultrasonic waves emitted by the probe to between 2 and 5 MHz, and uses a magnetic attachment to attach the liquid level detection sensor to the outer bottom surface of a metal container. This reduces the limitations of the liquid level detection sensor during installation and improves its portability. In this embodiment, the probe is used to emit and receive ultrasonic waves; limiting the frequency of the ultrasonic waves emitted by the probe to between 2 and 5 MHz improves the reliability of the detection, ensuring the normal operation of the liquid level detection sensor. Specifically, ultrasonic waves of 2 to 5 MHz have a longer wavelength, which allows them to penetrate the medium better during propagation, reducing signal interference caused by medium inhomogeneity or boundary reflections. Furthermore, ultrasonic waves of 2 to 5 MHz experience less attenuation in the medium, enabling them to propagate more effectively and return to the probe, reducing energy loss during signal propagation, thus making the received signal strength more stable and improving the reliability of the detection. The magnetic attachment provides an adsorption force to attach the liquid level detection sensor to the outer bottom surface of the metal container. This external liquid level sensor improves the reliability of liquid level detection by limiting the ultrasonic frequency emitted by the probe to between 2 and 5 MHz. It allows the sensor to be mounted on the outer surface of metal containers, reducing installation limitations and improving portability. Furthermore, the use of magnetic attachment simplifies the installation process and reduces installation difficulty. This external liquid level sensor has applications in the fields of sensors and liquid level detection equipment. Attached Figure Description

[0020] 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 the structures shown in these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the structure of an external liquid level detection sensor provided in one embodiment of the present invention;

[0022] Figure 2 for Figure 1 Cross-sectional view;

[0023] Figure 3 An exploded view of an external liquid level detection sensor provided in one embodiment of this utility model.

[0024] Explanation of icon numbers:

[0025] 100. Outer shell; 110. Bottom shell; 111. Button; 112. Locking block; 120. Front shell; 121. Receiving hole; 1211. First annular limiting block; 122. Guide groove; 123. Locking slot; 130. Receiving cavity; 200. Probe; 300. Magnetic suction component; 310. Magnet; 400. Receiving cylinder; 410. Second annular limiting block; 500. Control circuit board.

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] 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.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously.

[0030] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] A liquid level sensor is a non-contact detection device that uses ultrasonic principles to detect liquid levels. In actual production and research, researchers have found that liquid level sensors typically need to be installed in a specific location. For example, when installing a liquid level sensor on a metal container, it needs to be mounted on top of the container and detected from top to bottom. However, this increases the limitations of the liquid level sensor during installation and affects its portability.

[0032] This invention proposes an external liquid level detection sensor, aiming to solve the problem of large installation limitations of liquid level detection sensors.

[0033] Please see Figures 1 to 3 In one embodiment of this utility model, the external liquid level detection sensor includes a housing 100, a probe 200, and a magnetic suction element 300. The housing 100 includes a bottom shell 110 and a top shell 120. The bottom shell 110 is disposed on the top shell 120 and together with the top shell 120 forms a receiving cavity 130. The end face of the top shell 120 facing away from the bottom shell 110 is used to connect with the outer bottom surface of a metal container. The probe 200 is disposed in the receiving cavity 130 and is used to emit and receive ultrasonic waves. The frequency range of the ultrasonic waves emitted by the probe 200 is between 2 and 5 MHz. The magnetic suction element 300 is disposed in the receiving cavity 130 and is used to attract the metal container.

[0034] The technical solution of this utility model limits the frequency of the ultrasonic waves emitted by the probe 200 to between 2 and 5 MHz, and uses a magnetic suction device 300 to adsorb the liquid level detection sensor onto the outer bottom surface of the metal container. This reduces the limitations of the liquid level detection sensor during installation and improves its portability. In this embodiment, the probe 200 is used to emit and receive ultrasonic waves; limiting the frequency of the ultrasonic waves emitted by the probe 200 to between 2 and 5 MHz improves the reliability of the detection, ensuring the normal operation of the liquid level detection sensor. Specifically, ultrasonic waves of 2 to 5 MHz have a longer wavelength, which allows them to penetrate the medium better during propagation, reducing signal interference caused by medium inhomogeneity or boundary reflections. Furthermore, ultrasonic waves of 2 to 5 MHz experience less attenuation in the medium, enabling them to propagate more effectively and return to the probe 200, reducing energy loss during signal propagation, and thus making the received signal strength more stable and improving the reliability of the detection. The magnetic suction device 300 provides an adsorption force to adsorb the liquid level detection sensor onto the outer bottom surface of the metal container. This external liquid level sensor improves the reliability of liquid level detection by limiting the ultrasonic frequency emitted by the probe 200 to between 2 and 5 MHz. This allows the sensor to be mounted on the outer surface of metal containers, reducing installation limitations and improving portability. Furthermore, the use of a magnetic attachment 300 to attach the sensor to the metal container simplifies the installation process and reduces installation difficulty. This external liquid level sensor is applicable to the fields of sensors and liquid level detection equipment.

[0035] Liquid level detection sensors primarily utilize ultrasonic waves to penetrate the walls of metal containers and detect the signal reflected from the liquid surface. Specifically, during liquid level detection, the ultrasonic waves emitted by probe 200 pass through the metal container wall and the medium sequentially to reach the liquid surface. The liquid surface then reflects the ultrasonic waves, which probe 200 receives. By measuring the time difference and energy attenuation between the emitted and received ultrasonic signals, and combining this with known sound or wave speeds, the liquid level sensor can calculate the liquid level height. Furthermore, this externally mounted liquid level sensor can be modified in software to reduce computation and amplify background noise for better identification of valid signals. Additionally, second-order filtering and Kalman filtering algorithms, multi-mode wave separation algorithms, and dynamic temperature compensation models can be used to improve the detection accuracy and stability of the liquid level sensor.

[0036] In one embodiment of this invention, the probe 200 is a broadband piezoelectric ceramic transducer, and the frequency of the ultrasonic wave emitted by the probe 200 is 2MHz. In this embodiment, the broadband piezoelectric ceramic transducer has broadband characteristics, enabling the probe 200 to cover a wide frequency range, thus allowing it to operate at different frequencies and adapt to the characteristics of various media such as liquids and gases. The piezoelectric ceramic has a high electromechanical coupling coefficient, which enables it to more efficiently convert acoustic energy into electrical energy when receiving signals, thereby reducing energy loss during the transmission and reception of ultrasonic signals by the probe 200 and improving the sensitivity and reliability of the liquid level detection sensor.

[0037] Please see Figure 2 In one embodiment of this utility model, the externally attached liquid level detection sensor further includes a receiving cylinder 400, which is disposed within the receiving cavity 130, with its closed end exposed on the end face of the face shell 120 away from the bottom shell 110. A probe 200 is disposed on the closed end of the receiving cylinder 400. In this embodiment, by placing the probe 200 on the closed end of the receiving cylinder 400 exposed on the end face of the face shell 120 away from the bottom shell 110, the distance between the probe 200 and the metal container can be reduced, thereby reducing the energy loss of ultrasonic waves during transmission and improving the detection coverage of the liquid level detection sensor.

[0038] In one embodiment of this utility model, the face shell 120 is provided with a receiving hole 121, and the receiving cylinder 400 passes through the receiving hole 121 and is exposed on the end face of the face shell 120 opposite to the bottom shell 110. A first annular limiting block 1211 is provided in the receiving hole 121, and a second annular limiting block 410 extending circumferentially around the receiving cylinder 400 is provided. The side of the first annular limiting block 1211 facing the bottom shell 110 abuts against the side of the second annular limiting block 410 opposite to the bottom shell 110. In this embodiment, by providing the first annular limiting block 1211 and the second annular limiting block 410, the position of the receiving cylinder 400 can be restricted to prevent the receiving cylinder 400 from falling out of the receiving hole 121. In a specific embodiment, the first annular limiting block 1211 is integrally formed with the face shell 120, and the second annular limiting block 410 is integrally formed with the receiving cylinder 400.

[0039] Please see Figure 2 and Figure 3In one embodiment of this utility model, the magnetic suction component 300 includes multiple magnets 310, which are evenly spaced and arranged in the receiving cavity 130 along the circumferential direction of the shell 120. In this embodiment, the multiple magnets 310 evenly spaced along the circumferential direction of the shell 120 are used to attract the liquid level detection sensor to the metal container, ensuring the stability of the liquid level detection sensor when attached to the metal container. In a specific embodiment, there are two magnets 310; in addition, the number of magnets 310 can also be three, four, etc.

[0040] In one embodiment of this invention, an adhesive layer is provided on the end face of the face shell 120 opposite to the bottom shell 110. The adhesive layer is used to bond to the outer bottom surface of the metal container, and the adhesive layer is made of epoxy resin. In this embodiment, using an adhesive layer made of epoxy resin to bond the liquid level detection sensor to the metal container enables the liquid level detection sensor to be bonded to the metal container more firmly, reducing the risk of the liquid level detection sensor falling off.

[0041] In one embodiment of this invention, the externally mounted liquid level sensor further includes a control circuit board 500, which is disposed within the accommodating cavity 130. The probe 200 is electrically connected to the control circuit board 500, and the probe 200 has a signal transmitting state and a signal receiving state. The control circuit board 500 is used to control the probe 200 to switch between the signal transmitting state and the signal receiving state. In this embodiment, the probe 200 has a signal transmitting state for transmitting ultrasonic signals and a signal receiving state for receiving ultrasonic signals; the control circuit board 500 is used to power the probe 200 and control the probe 200 to switch between the signal transmitting state and the signal receiving state. By using a transceiver integrated probe 200, the structure of the liquid level sensor can be simplified. Specifically, when using a liquid level detection sensor, the control circuit board 500 first controls the probe 200 to switch to the signal transmission state. After the probe 200 emits an ultrasonic signal, the control circuit board 500 then controls the probe 200 to switch from the signal transmission state to the signal reception state, so that the probe 200 can receive the ultrasonic signal emitted by it and reflected by the liquid surface, thus completing the detection of the liquid level.

[0042] In one embodiment of this utility model, the control circuit board 500 is provided with a push-button switch, and the bottom shell 110 is provided with a button 111 corresponding to the position of the push-button switch, the button 111 being able to abut against the push-button switch. In this embodiment, the push-button switch is used to control the operation of the liquid level detection sensor; in actual use, the operator can press the button 111, and then press the push-button switch to control the operation of the liquid level detection sensor. In a specific embodiment, the button 111 is a transparent part; the button 111 is made of transparent material, which makes it easy for the operator to observe whether the power supply of the control circuit board 500 is normal through the button 111. In a more specific embodiment, to facilitate observation by the operator, an indicator light for indicating that the control circuit board 500 is powered normally can be provided on the control circuit board 500.

[0043] Please see Figure 3 In one embodiment of this utility model, the front shell 120 is characterized by having a guide groove 122 and a slot 123 that are interconnected. The guide groove 122 extends along the thickness direction of the front shell 120, and the slot 123 extends along the circumferential direction of the front shell 120. The bottom shell 110 is provided with a locking block 112, which passes through the guide groove 122 and engages with the slot 123. In this embodiment, the front shell 120 and the bottom shell 110 are connected by a snap-fit ​​method, which can reduce the assembly difficulty of the liquid level detection sensor.

[0044] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. An externally attached liquid level detection sensor, characterized by include: The outer shell includes a bottom shell and a top shell. The bottom shell is disposed on the top shell and surrounds the top shell to form an accommodating cavity. The end face of the top shell facing away from the bottom shell is used to connect with the outer bottom surface of a metal container. The probe is disposed within the accommodating cavity and is used to emit and receive ultrasonic waves. The frequency range of the ultrasonic waves emitted by the probe is between 2 and 5 MHz. A magnetic attractor is disposed within the accommodating cavity and is used to attract the metal container.

2. The externally attached liquid level detection sensor of claim 1, wherein The probe is a broadband piezoelectric ceramic transducer, and the frequency of the ultrasonic wave emitted by the probe is 2MHz.

3. The externally attached liquid level detection sensor of claim 1, wherein The external liquid level detection sensor also includes a receiving cylinder, which is disposed inside the receiving cavity, with the closed end of the receiving cylinder exposed on the end face of the front shell away from the bottom shell, and the probe is disposed at the closed end of the receiving cylinder.

4. The externally attached liquid level detection sensor of claim 3, wherein The face shell is provided with a receiving hole, and the receiving cylinder passes through the receiving hole and is exposed on the end face of the face shell away from the bottom shell; A first annular limiting block is provided in the receiving hole, and a second annular limiting block is provided in the receiving cylinder extending around it. The side of the first annular limiting block facing the bottom shell abuts against the side of the second annular limiting block away from the bottom shell.

5. The externally attached liquid level detection sensor of claim 1, wherein The magnetic suction component includes a magnet, and there are multiple magnets, which are evenly spaced and arranged in the accommodating cavity along the circumferential direction of the shell.

6. The externally attached liquid level detection sensor of claim 1, wherein An adhesive layer is provided on the end face of the outer shell that is away from the bottom shell. The adhesive layer is used to bond to the outer bottom surface of the metal container, and the adhesive layer is an epoxy resin component.

7. The externally attached liquid level detection sensor of claim 1, wherein The external liquid level detection sensor also includes a control circuit board, which is disposed in the accommodating cavity. The probe is electrically connected to the control circuit board, and the probe has a signal transmission state and a signal reception state. The control circuit board is used to control the probe to switch between the signal transmission state and the signal reception state.

8. The externally attached liquid level detection sensor of claim 7, wherein The control circuit board is equipped with a push switch, and the bottom shell is equipped with a button at the position corresponding to the push switch, the button being able to abut against the push switch.

9. The externally attached liquid level detection sensor of claim 8, wherein, The button is a transparent component.

10. The externally attached liquid level detection sensor according to any one of claims 1 to 9, wherein The face shell is provided with a guide groove and a slot that are interconnected. The guide groove extends along the thickness direction of the face shell, and the slot extends along the circumferential direction of the face shell. The bottom shell is provided with a locking block, which passes through the guide groove and is locked into the slot.

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