Liquid level detection sensor

Abstract

The utility model discloses a liquid level detection sensor, and relates to the technical field of sensors, the liquid level detection sensor comprises a main body, a cover body, a detection module and a control panel, the main body is provided with a conduction block; the cover body is arranged on the main body, the cover body and the main body define an accommodating cavity, and the conduction block is provided with a transmission hole; at least part of the transmission hole is gradually expanded from one end close to the accommodating cavity to one end far away from the accommodating cavity, the detection module comprises a circuit board and a probe, the circuit board is arranged in the accommodating cavity, the probe is arranged on the circuit board and accommodated in the transmission hole, and the probe has a signal transmitting state and a signal receiving state; the control panel is arranged in the accommodating cavity and is in electric signal connection with the circuit board; the control panel is used for controlling the probe to be switched between a signal transmitting state and a signal receiving state. According to the technical scheme, the technical problems that a liquid level detection sensor is complex in structure and limited in detection distance can be solved.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a 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 suffer from technical problems such as complex structure and limited detection distance.

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

[0004] The main purpose of this invention is to provide a liquid level detection sensor, which aims to solve the technical problems of complex structure and limited detection distance of existing liquid level detection sensors.

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

[0006] The main body is provided with a conductive block;

[0007] A cover body is disposed on the main body and together with the main body to form a receiving cavity; the conductive block is provided with a transmission hole; at least a portion of the transmission hole is provided to gradually expand from one end near the receiving cavity to one end away from the receiving cavity;

[0008] The detection module includes a circuit board and a probe. The circuit board is disposed within the accommodating cavity, and the probe is disposed on the circuit board and accommodated in the transmission hole. The probe has a signal transmission state and a signal reception state.

[0009] A control board is disposed within the accommodating cavity and is electrically connected to the circuit board; the control board is used to control the probe to switch between the signal transmission state and the signal reception state.

[0010] In one embodiment, the transmission hole includes a first transmission segment and a second transmission segment that are interconnected. The second transmission segment is located on the side of the first transmission segment away from the receiving cavity. The first transmission segment is a cylindrical hole, and the second transmission segment is a tapered hole. The second transmission segment is gradually expanded from the end closer to the first transmission segment to the end away from the first transmission segment. The probe is received in the first transmission segment.

[0011] In one embodiment, the probe is a broadband piezoelectric ceramic transducer.

[0012] In one embodiment, a sealing element is provided between the main body and the cover.

[0013] In one embodiment, the circuit board is disposed on the main body, and an annular silicone element is disposed between the circuit board and the main body.

[0014] In one embodiment, the liquid level detection sensor further includes a mounting bracket threadedly connected to the conductive block.

[0015] In one embodiment, the mounting bracket includes a mounting block and a mounting frame. The mounting block is sleeved on the conductive block and threadedly connected to the conductive block. The mounting frame is disposed on the mounting block and has a strip-shaped mounting hole.

[0016] In one embodiment, the mounting bracket includes a first plate, a second plate, and a third plate connected in sequence. The first plate and the third plate are respectively disposed on two opposite end faces of the second plate. The first plate is disposed on the mounting block, and the third plate is provided with the strip-shaped mounting hole.

[0017] In one embodiment, there are two mounting brackets, namely a first mounting bracket and a second mounting bracket. The mounting block is provided with two snap-fit ​​parts, namely a first snap-fit ​​part and a second snap-fit ​​part. The mounting bracket has a first mounting state and a second mounting state.

[0018] When the mounting bracket is in the first mounting state, the first mounting bracket is engaged with the first engaging portion, the second mounting bracket is engaged with the second engaging portion, and the second plate of the first mounting bracket and the second plate of the second mounting bracket are respectively located on both sides of the cover; when the mounting bracket is in the second mounting state, the first mounting bracket is engaged with the second engaging portion, the second mounting bracket is engaged with the first engaging portion, and the second plate of the first mounting bracket and the second plate of the second mounting bracket are respectively located on both sides of the conductive block.

[0019] In one embodiment, the mounting bracket is provided with a first extension block and a second extension block disposed at an angle to the first extension block. The mounting block is provided with a slot and a groove. The groove extends circumferentially along the mounting block and communicates with the slot. The second extension block passes through the slot and is inserted into the groove.

[0020] This invention simplifies the structure of a liquid level sensor by employing an integrated transceiver probe. Furthermore, housing the probe within a transmission aperture that is at least partially horn-shaped increases the sensor's detection distance. In this embodiment, the conductive block has a horn-shaped transmission aperture, at least a portion of which is horn-shaped, which enhances the sensor's detection distance. Specifically, the horn-shaped aperture concentrates and directs the ultrasonic signal emitted by the probe towards the target area, reducing energy diffusion and loss during propagation, thereby improving signal strength and transmission efficiency. Simultaneously, the horn-shaped aperture reduces interference from reflected signals, enhancing the signal-to-noise ratio and enabling the liquid level sensor to accurately receive reflected ultrasonic signals at greater distances, thus achieving a longer detection range. The probe has a signal transmission state for emitting ultrasonic signals and a signal reception state for receiving ultrasonic signals, and the control board controls the switching between these states. Employing an integrated transceiver probe simplifies the structure of the liquid level sensor. Specifically, when using this liquid level detection sensor, the control board first controls the probe to switch to signal transmission mode. After the probe emits an ultrasonic signal, the control board then controls the probe to switch from signal transmission mode to signal reception mode, so that the probe can receive the ultrasonic signal emitted by it and reflected by the liquid surface, thus completing the detection of the liquid level. Attached Figure Description

[0021] 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.

[0022] Figure 1 A schematic diagram of the structure of a liquid level detection sensor in one embodiment of this utility model;

[0023] Figure 2 for Figure 1 Cross-sectional view;

[0024] Figure 3 for Figure 1 Another cross-sectional view;

[0025] Figure 4 An exploded view of a liquid level detection sensor in one embodiment of this utility model.

[0026] Explanation of icon numbers:

[0027] 100. Main body; 110. Conducting block; 111. Transmission hole; 1111. First transmission section; 1112. Second transmission section; 200. Cover; 210. Accommodating cavity; 220. Sealing element; 300. Detection module; 310. Circuit board; 311. Silicone part; 320. Probe; 400. Control board; 500. Mounting bracket; 510. Mounting block; 511. Snap-fit ​​part; 5111. First snap-fit ​​part; 5112. Second snap-fit ​​part; 512. Groove; 513. Slot; 520. Mounting frame; 521. First plate; 522. Second plate; 523. Third plate; 524. Strip mounting hole; 525. First mounting frame; 526. Second mounting frame; 527. First extension block; 5271. Second extension block.

[0028] 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

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Liquid level sensors are non-contact detection devices that use ultrasonic principles to detect liquid levels. In actual production and research, researchers have found that most liquid level sensors employ a dual-probe structure, meaning they simultaneously install a signal transmitting probe and a signal receiving probe. However, the precise placement and fixing of these probes are crucial for accurate detection, leading to a complex sensor structure. Furthermore, the detection distance of liquid level sensors is generally limited to 3-5 meters, which fails to meet practical user needs and presents a technical limitation.

[0034] This invention proposes a liquid level detection sensor, aiming to solve the technical problems of complex structure and limited detection distance in existing liquid level detection sensors.

[0035] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the liquid level detection sensor includes a main body 100, a cover 200, a detection module 300, and a control board 400. The main body 100 is provided with a conductive block 110. The cover 200 is disposed on the main body 100 and forms a receiving cavity 210 with the main body 100. The conductive block 110 is provided with a transmission hole 111. At least a portion of the transmission hole 111 is gradually widened from one end near the receiving cavity 210 to the end away from the receiving cavity 210. The detection module 300 includes a circuit board 310 and a probe 320. The circuit board 310 is disposed in the receiving cavity 210, and the probe 320 is disposed on the circuit board 310 and housed in the transmission hole 111. The probe 320 has a signal transmission state and a signal reception state. The control board 400 is disposed in the receiving cavity 210 and is electrically connected to the circuit board 310. The control board 400 is used to control the probe 320 to switch between the signal transmission state and the signal reception state.

[0036] The technical solution of this utility model simplifies the structure of the liquid level detection sensor by employing a transceiver integrated probe 320. Furthermore, housing the probe 320 within a transmission aperture 111 that is at least partially horn-shaped increases the detection distance of the liquid level detection sensor. In this embodiment, the conductive block 110 is provided with a horn-shaped transmission aperture 111, and at least a portion of the transmission aperture 111 is horn-shaped, which increases the detection distance of the liquid level detection sensor. Specifically, the horn-shaped transmission aperture 111 can concentrate and guide the ultrasonic signal emitted by the probe 320 to the target area, reducing energy diffusion and loss during propagation, thereby improving signal strength and transmission efficiency. Simultaneously, the horn-shaped transmission aperture 111 can also reduce interference from reflected signals, enhancing the signal-to-noise ratio, enabling the liquid level detection sensor to accurately receive reflected ultrasonic signals at greater distances, achieving a longer detection distance. The probe 320 has a signal transmission state for emitting ultrasonic signals and a signal reception state for receiving ultrasonic signals, and the control board 400 can control the probe 320 to switch between these states. By employing a transceiver integrated probe 320, the structure of the liquid level detection sensor can be simplified. Specifically, when using this liquid level detection sensor, the control board 400 first controls the probe 320 to switch to signal transmission mode. After the probe 320 emits an ultrasonic signal, the control board 400 then controls the probe 320 to switch from signal transmission mode to signal reception mode, so that the probe 320 can receive the ultrasonic signal it emitted and reflected by the liquid surface, thus completing the liquid level detection. This liquid level detection sensor is applied in the technical fields of sensors and liquid level detection equipment.

[0037] Please see Figure 2 In one embodiment of this utility model, the transmission hole 111 includes a first transmission segment 1111 and a second transmission segment 1112 that are interconnected. The second transmission segment 1112 is located on the side of the first transmission segment 1111 away from the receiving cavity 210. The first transmission segment 1111 is a cylindrical hole, and the second transmission segment 1112 is a conical hole. The second transmission segment 1112 is gradually widened from the end closer to the first transmission segment 1111 to the end away from the first transmission segment 1111. The probe 320 is housed in the first transmission segment 1111. In this embodiment, the probe 320 is housed in the cylindrical first transmission segment 1111, which can provide a stable signal transmission and reception platform, ensuring the energy concentration and directionality of the ultrasonic signal. The first transmission segment 1111 is a conical hole, which can optimize energy concentration and propagation, reduce the attenuation of the ultrasonic signal in the air, and reduce the scattering of the reflected signal, thereby improving the stability and reliability of the detection.

[0038] In one embodiment of this invention, the probe 320 is a broadband piezoelectric ceramic transducer. In this embodiment, by selecting a broadband piezoelectric ceramic transducer, the measurement performance of the liquid level detection sensor can be improved. Specifically, the broadband characteristics of the broadband piezoelectric ceramic transducer enable the liquid level detection sensor to maintain a stable signal response over a wider frequency range, thereby improving measurement accuracy and anti-interference capability; its high sensitivity and fast response characteristics can more accurately capture subtle changes in ultrasonic signals, especially in complex environments or when the liquid surface is fluctuating. In a specific embodiment, the aforementioned broadband piezoelectric ceramic transducer has a single 40kHz frequency. A 40kHz single-frequency transducer has high energy conversion efficiency, good directionality, and anti-interference capability, and can operate stably over a wide temperature and humidity range, thereby ensuring the stability and reliability of the signal when the liquid level detection sensor measures in different media.

[0039] Please see Figure 2 In one embodiment of this utility model, a sealing element 220 is provided between the main body 100 and the cover 200. In this embodiment, the sealing element 220 serves a sealing function, isolating the accommodating cavity 210 formed by the main body 100 and the cover 200 from the external environment to ensure the stable operation of the liquid level detection sensor. In a specific embodiment, the sealing element 220 can be a sealing ring, with the main body 100 having an accommodating groove in which the sealing element 220 is accommodated and abuts against the cover 200 to ensure a sealing effect.

[0040] Please see Figure 4 In one embodiment of this utility model, a circuit board 310 is disposed on the main body 100, and an annular silicone element 311 is disposed between the circuit board 310 and the main body 100. In this embodiment, the silicone element 311 serves a sealing function, isolating the accommodating cavity 210 formed by the main body 100 and the cover 200 from the external environment to ensure the stable operation of the liquid level detection sensor. Furthermore, using the silicone element 311 for sealing eliminates the need for potting compound sealing, reduces manufacturing costs, and lightens the weight of the liquid level detection sensor; simultaneously, the silicone element 311 also has shock absorption capabilities, filtering out the influence of externally transmitted vibrations on the performance of the liquid level detection sensor and improving the detection accuracy of the liquid level detection sensor.

[0041] Please see Figures 1 to 3 In one embodiment of this utility model, the liquid level detection sensor further includes a mounting bracket 500, which is threadedly connected to the conductive block 110. In actual use, the user can install the liquid level detection sensor in a designated position using the mounting bracket 500 without any additional action, thus reducing the difficulty of installing the liquid level detection sensor.

[0042] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the mounting bracket 500 includes a mounting block 510 and a mounting frame 520. The mounting block 510 is sleeved on the conductive block 110 and threadedly connected to the conductive block 110. The mounting frame 520 is disposed on the mounting block 510, and the mounting frame 520 is provided with a strip-shaped mounting hole 524. In this embodiment, the mounting block 510 of the mounting bracket 500 is installed on the conductive block 110 by a threaded connection, which has the characteristics of simple structure and can reduce the assembly difficulty of the liquid level detection sensor. In actual use, the user can select a screw that matches the strip-shaped mounting hole 524 and install the liquid level detection sensor to the designated position through the strip-shaped mounting hole 524. In a specific embodiment, the mounting bracket 520 is Z-shaped. Specifically, the mounting bracket 520 includes a first plate 521, a second plate 522, and a third plate 523 connected in sequence. The first plate 521 and the third plate 523 are respectively disposed on two opposite end faces of the second plate 522. The first plate 521 is disposed on the mounting block 510, and the third plate 523 is provided with a strip-shaped mounting hole 524.

[0043] Please see Figure 3 In one embodiment of this utility model, there are two mounting brackets 520, namely a first mounting bracket 525 and a second mounting bracket 526. The mounting block 510 is provided with two snap-fit ​​portions 511, namely a first snap-fit ​​portion 5111 and a second snap-fit ​​portion 5112. The mounting bracket 500 has a first mounting state and a second mounting state. When the mounting bracket 500 is in the first mounting state, the first mounting bracket 525 is snapped into the first snap-fit ​​portion 5111, and the second mounting bracket... Mounting bracket 526 is engaged with the second engaging portion 5112, and the second plate 522 of the first mounting bracket 525 and the second plate 522 of the second mounting bracket 526 are respectively located on both sides of the cover 200. When the mounting bracket 500 is in the second mounting state, the first mounting bracket 525 is engaged with the second engaging portion 5112, the second mounting bracket 526 is engaged with the first engaging portion 5111, and the second plate 522 of the first mounting bracket 525 and the second plate 522 of the second mounting bracket 526 are respectively located on both sides of the conductive block 110. In this embodiment, by switching the mounting state of the mounting bracket 500, the entire liquid level detection sensor can present different appearances, which can improve the applicability of the liquid level detection sensor. In actual use, the user can switch the mounting bracket 500 to the required mounting state according to the actual space installation requirements, thereby avoiding interference between the liquid level detection sensor and other components when it is installed in the designated position.

[0044] Please see Figure 3In one embodiment of this utility model, the mounting bracket 520 is provided with a first extension block 527 and a second extension block 5271 arranged at an angle to the first extension block 527. The mounting block 510 is provided with a slot 512 and a groove 513. The groove 513 extends circumferentially along the mounting block 510 and communicates with the slot 512. The second extension block 5271 passes through the slot 512 and is inserted into the groove 513. In this embodiment, the mounting bracket 520 uses the above structure to achieve connection with the mounting block 510, which can reduce the difficulty of installing the mounting bracket 520 onto the mounting block 510, thereby reducing the assembly difficulty of the liquid level detection device. Specifically, when installing the mounting bracket 520 onto the mounting block 510, the user only needs to insert the second extension block 5271 into the slot 512 and then rotate the mounting bracket 520 to complete the installation of the mounting bracket 520. In one specific embodiment, the mounting block 510 is further provided with a limiting groove, and the mounting bracket 520 is provided with a limiting block, which is accommodated in the limiting groove and can abut against the two side walls of the limiting groove.

[0045] 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. A liquid level detecting sensor characterized by comprising: include: The main body is provided with a conductive block; A cover body is disposed on the main body and together with the main body to form a receiving cavity; the conductive block is provided with a transmission hole; at least a portion of the transmission hole is provided to gradually expand from one end near the receiving cavity to one end away from the receiving cavity; The detection module includes a circuit board and a probe. The circuit board is disposed within the accommodating cavity, and the probe is disposed on the circuit board and accommodated in the transmission hole. The probe has a signal transmission state and a signal reception state. A control board is disposed within the accommodating cavity and is electrically connected to the circuit board; the control board is used to control the probe to switch between the signal transmission state and the signal reception state.

2. The liquid level detecting sensor according to claim 1, wherein The transmission hole includes a first transmission segment and a second transmission segment that are interconnected. The second transmission segment is located on the side of the first transmission segment away from the accommodating cavity. The first transmission segment is a cylindrical hole, and the second transmission segment is a conical hole. The second transmission segment is gradually expanded from the end closer to the first transmission segment to the end away from the first transmission segment. The probe is accommodated in the first transmission segment.

3. The liquid level detecting sensor according to claim 1, wherein The probe is a broadband piezoelectric ceramic transducer.

4. The liquid level detecting sensor according to claim 1, wherein A sealing element is provided between the main body and the cover.

5. The liquid level detecting sensor according to claim 1, wherein The circuit board is disposed on the main body, and a ring-shaped silicone component is disposed between the circuit board and the main body.

6. The liquid level detecting sensor according to claim 1, wherein The liquid level detection sensor also includes a mounting bracket, which is threadedly connected to the conductive block.

7. The liquid level detecting sensor according to claim 6, wherein The mounting bracket includes a mounting block and a mounting frame. The mounting block is sleeved on the conductive block and threadedly connected to the conductive block. The mounting frame is disposed on the mounting block and has a strip-shaped mounting hole.

8. The liquid level detecting sensor according to claim 7, wherein The mounting bracket includes a first plate, a second plate, and a third plate connected in sequence. The first plate and the third plate are respectively disposed on two opposite end faces of the second plate. The first plate is disposed on the mounting block, and the third plate is provided with the strip-shaped mounting hole.

9. The liquid level detecting sensor according to claim 8, wherein The number of mounting brackets is two, namely a first mounting bracket and a second mounting bracket. The mounting block is provided with two snap-fit ​​parts, namely a first snap-fit ​​part and a second snap-fit ​​part. The mounting bracket has a first mounting state and a second mounting state. When the mounting bracket is in the first mounting state, the first mounting bracket is engaged with the first engaging portion, the second mounting bracket is engaged with the second engaging portion, and the second plate of the first mounting bracket and the second plate of the second mounting bracket are respectively located on both sides of the cover; when the mounting bracket is in the second mounting state, the first mounting bracket is engaged with the second engaging portion, the second mounting bracket is engaged with the first engaging portion, and the second plate of the first mounting bracket and the second plate of the second mounting bracket are respectively located on both sides of the conductive block.

10. The liquid level detecting sensor according to any one of claims 7 to 9, wherein The mounting frame is provided with a first extension block and a second extension block arranged at an angle with the first extension block, the mounting block is provided with a notch and a clamping groove, the clamping groove extends along the circumference of the mounting block and communicates with the notch, and the second extension block passes through the notch and is inserted into the clamping groove.

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