High-precision liquid level sensor

Abstract

The utility model relates to a high-precision liquid level sensor. The device comprises a shell, the shell comprises an upper shell and a lower shell, and one end, far away from the upper shell, of the lower shell extends to form a mounting column shell; the radar sensor is mounted in the mounting cavity, and the receiving and transmitting end of the radar sensor extends to the bottom wall of the lower shell; the absolute pressure liquid level sensor is installed at the end, away from the lower shell, of the installation column shell and can be immersed in liquid, and when the liquid level detected by the radar sensor is smaller than the first preset liquid level height, only the radar sensor works; when the liquid level detected by the radar sensor is larger than or equal to the first preset liquid level height and smaller than the second preset liquid level height, the radar sensor and the absolute pressure liquid level sensor work at the same time, and when the liquid level detected by the radar sensor is larger than or equal to the second preset liquid level height, the absolute pressure liquid level sensor works. The radar sensor stops working, and the absolute pressure liquid level sensor continues working. The problems that after the radar is immersed, the radar sensor is out of action, and liquid level data cannot be measured are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level monitoring, in particular to a high-precision liquid level sensor. Background Art

[0002] Urban sewage / rainwater discharge is an essential item for the living environment. With the continuous expansion of the city, the underground water supply and drainage network has become more and more complicated, and there may be burial and blockage, leading to more uncertainties. Therefore, as the lifeline of the city, liquid level data monitoring of sections / offices prone to water accumulation and water leakage has become an indispensable measure.

[0003] Currently, radar level sensors are mostly used to monitor liquid levels. However, radar level sensors measure liquid levels by reflecting radar wave signals off the water surface to determine the distance between the water surface and the radar. When the liquid surface submerges the radar (transceiver), the radar sensor loses its function and cannot measure liquid level data. Summary of the invention

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that when a radar liquid level sensor is used to monitor the liquid level, the radar sensor loses its function and cannot measure the liquid level data when the liquid surface immerses the radar.

[0005] In order to solve the above technical problems, the utility model provides a high-precision liquid level sensor, comprising:

[0006] A housing, the housing comprising an upper housing and a lower housing, a mounting cavity being formed between the upper housing and the lower housing, and a mounting column housing extending from one end of the lower housing away from the upper housing;

[0007] A radar sensor is installed in the installation cavity and its transceiver end extends on the bottom wall of the lower shell;

[0008] An absolute pressure liquid level sensor is installed at one end of the mounting column shell away from the lower shell, and the absolute pressure liquid level sensor can be immersed in the liquid;

[0009] Among them, when the liquid level detected by the radar sensor is lower than a first preset liquid level height, the radar sensor works and the absolute pressure liquid level sensor stops working; when the liquid level detected by the radar sensor is greater than or equal to the first preset liquid level height and lower than a second preset liquid level height, the radar sensor and the absolute pressure liquid level sensor work simultaneously; when the liquid level detected by the radar sensor is greater than or equal to the second preset liquid level height, the radar sensor stops working and the absolute pressure liquid level sensor continues working.

[0010] In one implementation of the utility model, a wall-mounted mounting bracket is installed on the outer side of the shell, and the wall-mounted mounting bracket is connected with an expansion screw for fixing.

[0011] In one implementation of the utility model, a bubble level is provided on the top plane of the shell.

[0012] In one implementation of the present invention, the mounting column housing is threadedly connected to the lower housing.

[0013] In one implementation of the utility model, a sealing ring is provided between the upper shell and the lower shell.

[0014] In one implementation of the utility model, the lower shell is equipped with a cable gland.

[0015] In one embodiment of the utility model, it also includes a connecting bracket and a fixing bolt assembly, the upper shell periphery is provided with an upper connecting edge, the lower shell periphery is provided with a lower connecting edge corresponding to the upper connecting edge, the connecting bracket is provided with an installation edge corresponding to the upper connecting edge and the lower connecting edge, and the fixing bolt assembly penetrates and connects the installation edge, the upper connecting edge and the lower connecting edge.

[0016] In one embodiment of the utility model, the connecting bracket includes an adjusting ear seat, the wall-mounted mounting bracket includes an ear plate arranged corresponding to the adjusting ear seat and a fixing plate vertically connected to the ear plate, the expansion screw is connected to the fixing plate, the ear plate is provided with a first hole and a second hole, the adjusting ear seat is provided with a vertical angle adjustment groove and a locking hole, an adjusting screw is connected between the vertical angle adjustment groove and the first hole, and a locking screw is connected between the locking hole and the second hole.

[0017] In one implementation of the present invention, the radar sensor is an 80 GHz radar sensor.

[0018] The above technical solution of the utility model has the following advantages compared with the prior art:

[0019] The high-precision liquid level sensor described in the utility model has a reasonable shell structure, which is convenient for the installation and fixation of the radar sensor and the absolute pressure liquid level sensor, and realizes continuous and accurate monitoring from low liquid level to high liquid level. When the liquid level is lower than the first preset height, only the radar sensor works and outputs the liquid level data. When the liquid level exceeds the first preset height but is lower than the second preset height, the radar sensor and the absolute pressure liquid level sensor work at the same time. When the liquid level exceeds the second preset height, only the absolute pressure liquid level sensor works. Accurate measurement under different liquid level conditions is realized. The problem that the radar sensor loses its function and cannot measure the liquid level data after being immersed in the radar is overcome. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of one side of the high-precision liquid level sensor of the utility model.

[0022] Figure 2 It is a schematic diagram of the overall structure of the other side of the high-precision liquid level sensor of the utility model.

[0023] Figure 3 It is a schematic diagram of the exploded structure of the utility model high-precision liquid level sensor.

[0024] Figure 4 It is a structural schematic diagram of the connecting bracket of the utility model.

[0025] Description of the Figures in the Specification:

[0026] 1. Shell; 11. Upper shell; 12. Lower shell; 13. Mounting column shell; 14. Bubble level; 15. Sealing ring; 16. Outlet gland;

[0027] 2. Radar sensor;

[0028] 3. Absolute pressure liquid level sensor;

[0029] 4. Wall mounting bracket; 41. Expansion screw; 42. Ear plate; 43. Fixing plate;

[0030] 5. Connecting bracket; 51. Fixing bolt assembly; 52. Mounting edge; 53. Adjusting ear seat; 54. Vertical angle adjustment slot; 55. Locking hole; 56. Adjusting screw; 57. Locking screw. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0032] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0033] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0035] Reference Figures 1 to 4 As shown, a high-precision liquid level sensor of the utility model comprises:

[0036] A housing 1, the housing 1 comprising an upper housing 11 and a lower housing 12, wherein a mounting cavity is formed between the upper housing 11 and the lower housing 12, and a mounting column housing 13 is extended from one end of the lower housing 12 away from the upper housing 11;

[0037] A radar sensor 2 is installed in the installation cavity and its transceiver end extends on the bottom wall of the lower shell 12;

[0038] An absolute pressure liquid level sensor 3 is installed at one end of the mounting column shell 13 away from the lower shell 12, and the absolute pressure liquid level sensor 3 can be immersed in the liquid;

[0039] Among them, when the liquid level detected by the radar sensor 2 is lower than the first preset liquid level height, the radar sensor 2 works and the absolute pressure liquid level sensor 3 stops working; when the liquid level detected by the radar sensor 2 is greater than or equal to the first preset liquid level height and lower than the second preset liquid level height, the radar sensor 2 and the absolute pressure liquid level sensor 3 work simultaneously; when the liquid level detected by the radar sensor 2 is greater than or equal to the second preset liquid level height, the radar sensor 2 stops working and the absolute pressure liquid level sensor 3 continues working.

[0040] In one embodiment, a wall-mounted mounting bracket 4 is installed on the outer side of the housing 1 , and the wall-mounted mounting bracket 4 is connected with an expansion screw 41 for fixing.

[0041] In one embodiment, a bubble level 14 is provided on the top plane of the housing 1. The bubble level 14 can be used to detect the horizontality and verticality of the sensor during installation when the housing 1 is installed, thereby ensuring the accuracy of the installation.

[0042] Specifically, the mounting column housing 13 is threadedly connected to the lower housing 12 for easy disassembly, assembly and maintenance.

[0043] Specifically, a sealing ring 15 is provided between the upper shell 11 and the lower shell 12. The design of the sealing ring 15 improves the waterproof performance of the sensor and ensures that the sensor works normally in a harsh environment.

[0044] The shell 1 or the wall-mounted bracket 4 can be made of high-performance materials such as 304 / 316 stainless steel, MC nylon, etc. that are resistant to high temperatures and acids and alkalis, which greatly increases its indoor and outdoor service life.

[0045] In one embodiment, the lower shell 12 is installed with an outlet cable gland 16. A control circuit board (PCBA) connected to the radar sensor 2 and the absolute pressure liquid level sensor 3 is also arranged in the installation cavity to analyze the liquid level data detected by the radar sensor 2 and output the converted RS485 signal through the outlet cable gland 16.

[0046] It can be understood that the radar sensor 2 includes a radar signal transceiver, and the control circuit board also includes a microprocessor, an analog-to-digital converter (ADC), a communication interface module, a power module, etc. The analog-to-digital converter can convert the analog signal obtained by the radar module 22 and the absolute pressure liquid level sensor 3 into a digital signal, and the digital signal is processed and analyzed by the microprocessor to obtain the liquid level information; the communication interface module can use Wi-Fi, 4G, NB-IoT, Cat1, Bluetooth, etc., or other wireless communication technologies, and can upload the liquid level information to the cloud, Internet of Things platform or local server, so as to facilitate remote monitoring and data analysis; the power module adopts a 12V~36V wide voltage power supply.

[0047] It should be understood that the switching of the working states of the radar sensor 2 and the absolute pressure liquid level sensor 3 at different liquid level heights can be achieved by controlling the microprocessor of the circuit board. The specific processing and control is conventional technology and will not be described in detail here.

[0048] In one embodiment, it also includes a connecting bracket 5 and a fixing bolt assembly 51, the upper shell 11 is provided with an upper connecting edge at its periphery, the lower shell 12 is provided with a lower connecting edge at its periphery corresponding to the upper connecting edge, the connecting bracket 5 is provided with an installation edge 52 corresponding to the upper connecting edge and the lower connecting edge, and the fixing bolt assembly 51 penetrates and connects the installation edge 52, the upper connecting edge and the lower connecting edge.

[0049] In one embodiment, the connecting bracket 5 includes an adjusting ear seat 53, the wall-mounted mounting bracket 4 includes an ear plate 42 corresponding to the adjusting ear seat 53 and a fixing plate 43 vertically connected to the ear plate 42, the expansion screw 41 is connected to the fixing plate 43, the ear plate 42 is provided with a first hole and a second hole, the adjusting ear seat 53 is provided with a vertical angle adjustment slot 54 and a locking hole 55, an adjusting screw 56 is connected between the vertical angle adjustment slot 54 and the first hole, and a locking screw 57 is connected between the locking hole 55 and the second hole. It is convenient to adjust and fix the installation angle, and improves the flexibility and reliability of installation.

[0050] In one embodiment, the radar sensor 2 is an 80 GHz radar sensor 2, or a millimeter wave or ultrasonic sensor of other wavelengths. The radar sensor 2 can be a radar sensor of RUDA, LDRR04, HY, or HYDS; the absolute pressure level sensor can be an absolute pressure level sensor of HIGHJOIN HPM1301, US MEAS (TE) 89BSD-018BA-A, or LEFOO LFT2000.

[0051] During use, after the sensor is fixedly installed by the wall-mounted mounting bracket 4, the 80GHz radar sensor 2 will detect the changes in the liquid level below it in real time. When the detected liquid level rises to within 30cm (the first preset liquid level height) from the radar sensor 2 (transceiver end), the absolute pressure liquid level sensor 3 will be triggered to collect real-time liquid level data. When the liquid level is 1cm (the second preset liquid level height) from the radar sensor 2, the radar sensor 2 stops working. At this time, the absolute pressure liquid level sensor 3 continues to collect liquid level data. The absolute pressure liquid level sensor 3 can be completely immersed in the liquid without affecting the collection of real-time data, that is, the entire sensor can be completely immersed in the liquid to work normally.

[0052] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A high-precision liquid level sensor, characterized in that: include: A housing (1), the housing (1) comprising an upper housing (11) and a lower housing (12), a mounting cavity being formed between the upper housing (11) and the lower housing (12), and a mounting column housing (13) extending from one end of the lower housing (12) away from the upper housing (11); A radar sensor (2) is installed in the installation cavity and its transceiver end extends on the bottom wall of the lower shell (12); An absolute pressure liquid level sensor (3) is mounted on an end of the mounting column housing (13) away from the lower housing (12), and the absolute pressure liquid level sensor (3) can be immersed in liquid; When the liquid level detected by the radar sensor (2) is less than a first preset liquid level height, the radar sensor (2) operates while the absolute pressure liquid level sensor (3) stops operating; when the liquid level detected by the radar sensor (2) is greater than or equal to the first preset liquid level height but less than a second preset liquid level height, the radar sensor (2) and the absolute pressure liquid level sensor (3) operate simultaneously; when the liquid level detected by the radar sensor (2) is greater than or equal to the second preset liquid level height, the radar sensor (2) stops operating while the absolute pressure liquid level sensor (3) continues operating.

2. A high-precision liquid level sensor according to claim 1, characterized in that: A wall-mounted mounting bracket (4) is mounted on the outside of the housing (1), and the wall-mounted mounting bracket (4) is connected to an expansion screw (41) for fixing.

3. A high-precision liquid level sensor according to claim 1, characterized in that: A bubble level (14) is provided on the top plane of the housing (1).

4. A high-precision liquid level sensor according to claim 1, characterized in that: The mounting column housing (13) is threadedly connected to the lower housing (12).

5. A high-precision liquid level sensor according to claim 1, characterized in that: A sealing ring (15) is provided between the upper shell (11) and the lower shell (12).

6. A high-precision liquid level sensor according to claim 1, characterized in that: The lower shell (12) is equipped with an outlet cable gland (16).

7. A high-precision liquid level sensor according to claim 2, characterized in that: It also comprises a connecting bracket (5) and a fixing bolt assembly (51), wherein the upper shell (11) is provided with an upper connecting edge at its periphery, and the lower shell (12) is provided with a lower connecting edge at its periphery corresponding to the upper connecting edge, and the connecting bracket (5) is provided with a mounting edge (52) corresponding to the upper connecting edge and the lower connecting edge, and the fixing bolt assembly (51) penetrates through and connects the mounting edge (52), the upper connecting edge and the lower connecting edge.

8. A high-precision liquid level sensor according to claim 7, characterized in that: The connecting bracket (5) comprises an adjusting ear seat (53), the wall-mounted mounting bracket (4) comprises an ear plate (42) arranged corresponding to the adjusting ear seat (53) and a fixing plate (43) vertically connected to the ear plate (42), the expansion screw (41) is connected to the fixing plate (43), the ear plate (42) is provided with a first hole and a second hole, the adjusting ear seat (53) is provided with a vertical angle adjusting groove (54) and a locking hole (55), an adjusting screw (56) is connected between the vertical angle adjusting groove (54) and the first hole, and a locking screw (57) is connected between the locking hole (55) and the second hole.

9. A high-precision liquid level sensor according to claim 1, characterized in that: The radar sensor (2) is an 80 GHz radar sensor.

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