Full-scale radar water level gauge

Abstract

The utility model relates to the technical field of water level monitoring, in particular to a full-scale radar water level gauge, which combines a radar water level gauge with a pressure sensor, arranges the radar water level gauge and the pressure sensor in a pressure detection cover, and mainly monitors the height of a water level through the radar water level gauge. The internal air pressure of the pressure detection cover is gradually increased under extrusion of water, when the water level rises to the blind area distance of the radar water level gauge, the radar water level gauge cannot monitor the water level height, at the moment, the internal air pressure of the pressure detection cover is detected through the pressure sensor, the internal air pressure is compared with the external atmospheric pressure, and therefore the water level height is calculated; due to the fact that a certain amount of air exists in the pressure detection cover, even if the device is wholly submerged by water, the water in the pressure detection cover does not make contact with the radar water level gauge body, sediment or sludge or sundries are prevented from making contact with the radar water level gauge body and the pressure sensor, and the service life of the product is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of water level monitoring, and in particular to a full-range radar water level meter. Background Art

[0002] A water level meter is an instrument that can automatically measure and record the water level of water bodies such as rivers, lakes and irrigation canals. Water levels are usually measured using radar level gauges or pressure level gauges.

[0003] The measurement principle of the radar water level meter is to calculate the distance between the radar water level meter and the water surface by measuring the time it takes for the radar pulse to be emitted to the water surface and reflected back, thereby monitoring the water level. It has the advantages of being unaffected by environmental factors such as temperature, humidity, wind speed, rainfall, and high accuracy. However, the radar water level meter is easily affected by floating objects on the water, causing mismeasurement, and it takes a certain amount of time for the radar pulse to be emitted and reflected. If the water level is too close to the radar probe, the time from emission to reflection is extremely short, and the reflected pulse cannot be received, resulting in failure to measure normally. This distance is called the blind spot distance of the radar water level meter. Based on this blind spot distance, the radar water level meter cannot monitor the water level over the entire range.

[0004] The pressure water level gauge is made of isolated diffused silicon sensitive elements. It can be directly put into a container or water body to accurately measure the height from the end of the water level gauge to the water surface. It has the advantages of high sensitivity, high accuracy, and easy installation and placement. However, if the pressure water level gauge is used in waters with poor water quality, sediment, silt or other debris can easily block the sensor probe, thus affecting the measurement accuracy.

[0005] Most existing water level monitoring systems combine radar water level gauges with pressure water level gauges. Although this can make up for the blind spots of radar water level gauges, the installation is cumbersome, the control and monitoring procedures are complex, and the maintenance workload is large. Because contact measurement is not completely eliminated, mud, silt or other debris will still clog the sensor probe, affecting the measurement accuracy and life of the product. Utility Model Content

[0006] The utility model aims to solve the above-mentioned problem, thereby providing a device capable of compensating for the blind area of ​​a radar water level meter.

[0007] The utility model solves the above problems and adopts the following technical solutions:

[0008] A full-range radar water level gauge comprises a radar water level gauge body, a pressure sensor and a pressure detection cover. The pressure detection cover is a cylindrical structure with a closed upper end and an open lower end. The radar water level gauge body and the pressure sensor are arranged inside the pressure detection cover, and the antenna of the radar water level gauge body faces the lower end opening of the pressure detection cover. The height of the pressure detection cover below the radar water level gauge body is greater than the blind zone distance of the radar water level gauge. The radar water level gauge is fixed above the water body whose water level is to be detected. When the water level rises to the inside of the pressure detection cover and reaches the blind zone distance of the radar water level gauge, the air pressure inside the pressure detection cover is detected by the pressure sensor, and the water level height is calculated by the difference between the internal air pressure and the external air pressure.

[0009] Compared with the prior art, the utility model adopting the above technical solution has the following beneficial effects:

[0010] The utility model combines a radar water level gauge with a pressure sensor, and arranges the radar water level gauge and the pressure sensor in a pressure detection cover. The water level height is mainly monitored by the radar water level gauge. When the water level rises to the inside of the pressure detection cover, the internal air pressure of the pressure detection cover gradually increases under the squeeze of the water body. When the water level rises to the blind spot distance of the radar water level gauge, the radar water level gauge cannot monitor the water level height. At this time, the internal air pressure of the pressure detection cover is detected by the pressure sensor, and the internal air pressure is compared with the external atmospheric pressure to calculate the water level height. Since the upper end of the pressure detection cover is a closed structure, a certain amount of air exists inside the pressure detection cover. Even if the water body submerges the entire device, the water body inside the pressure detection cover will not contact the radar water level gauge body, thereby preventing mud, silt or other debris from contacting the radar water level gauge body and the pressure sensor, thereby increasing the service life of the product.

[0011] As a preferred embodiment, a further technical solution of the utility model is:

[0012] The radar water level meter body includes a shell, a circuit board and a cable plug. The antenna of the radar water level meter body is fixed inside the shell. A cable socket connected to the antenna is fixed on the shell. The cable plug is plugged into the cable socket. The cable socket is connected to the circuit board. A radar sensor is arranged on the circuit board. The radar sensor transmits and receives radar pulses through the antenna. The cable connected to the cable plug extends to the outside through the pressure detection cover. Through the above structure, the radar pulse signal can be sent to the external monitoring system through the plug-in structure of the cable plug and the cable socket.

[0013] The pressure sensor is fixed on the housing, the pressure sensor is wired to the cable socket, and the pressure sensor is connected to the external monitoring system through the cable plug and the cable socket. Through the above structure, it is convenient to output the detection signal of the pressure sensor to the external monitoring system through the cable plug and the cable socket.

[0014] A sealing gasket is fixed inside the pressure detection cover, the top of the shell is in contact with the bottom of the sealing gasket, the top of the cable socket passes through the sealing gasket and extends into the space above the sealing gasket, and the space above the sealing gasket is filled with epoxy resin glue, which makes the sealing gasket, the pressure detection cover cable socket above the sealing gasket, the cable plug and the cable form a whole. The structure above the sealing gasket is sealed by epoxy resin glue to prevent liquid from flowing into the interior of the radar water level gauge through the plug-in position of the cable plug and the cable socket and the top of the cable plug, thereby preventing corrosive gases from corroding the interior of the radar water level gauge. The cable and the cable plug are fixed in the epoxy resin glue without loosening or falling off, thereby improving the service life of the device.

[0015] The top of the pressure detection cover is provided with a through hole for the cable to pass through, and a waterproof joint is fixed in the through hole, and the position where the cable passes through the through hole is sealed by the waterproof joint. The through hole position where the cable passes through is sealed by the waterproof joint to prevent liquid from entering the interior of the device from the through hole position.

[0016] The pressure detection cover includes an upper sealing cover and a lower detection cover, a sealing pad is fixed inside the lower detection cover, and a sealing ring is provided at the connection position between the upper sealing cover and the lower detection cover. The connection position between the upper sealing cover and the lower detection cover is sealed by the sealing ring, so as to further increase the sealing effect, prevent water and corrosive gases from corroding the inside of the radar water level gauge, and increase the detection accuracy.

[0017] A mounting bracket is fixed on the outer wall of the pressure detection cover, and a mounting hole is opened on the mounting bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front cross-sectional view of an embodiment of the present application;

[0019] Figure 2 is a side view of an embodiment of the present application;

[0020] Figure 3 This is a component disassembly diagram of an embodiment of the present application.

[0021] In the figure: 1. cable; 2. waterproof connector; 3. upper sealing cover; 4. lower detection cover; 5. mounting bracket; 6. mounting hole; 7. antenna; 8. pressure sensor; 9. housing; 10. cable socket; 11. sealing gasket; 12. sealing ring; 13. cable plug; 14. epoxy resin glue. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0023] Reference Figure 1-3The embodiment of the present application discloses a full-range radar water level gauge, including a radar water level gauge body, a pressure sensor 8 and a pressure detection cover. The pressure detection cover is a cylindrical structure with a closed upper end and an open lower end. The radar water level gauge body and the pressure sensor 8 are arranged inside the pressure detection cover, and the antenna 7 of the radar water level gauge body faces the lower end opening of the pressure detection cover; the height of the pressure detection cover below the radar water level gauge body is greater than the blind spot distance of the radar water level gauge; the radar water level gauge is fixed above the water body to be detected; when the water level rises to the inside of the pressure detection cover and reaches the blind spot distance of the radar water level gauge, the pressure sensor 8 detects the internal air pressure of the pressure detection cover, and the water level height is calculated by the difference between the internal air pressure and the external air pressure.

[0024] In this embodiment, the radar water level meter body of this embodiment includes a shell 9, a circuit board and a cable plug 13. The antenna 7 of the radar water level meter body is fixed inside the shell 9. A cable socket 10 connected to the antenna 7 is fixed on the shell 9. The cable plug 13 is plugged into the cable socket 10. The cable socket 10 is connected to the circuit board. A radar sensor is arranged on the circuit board. The radar sensor transmits and receives radar pulses through the antenna 7. The cable 1 connected to the cable plug 13 extends to the outside through the pressure detection cover. Preferably, the cable plug 13 and the cable socket 10 adopt an aviation plug structure. Through the above structure, through the plug-in structure of the cable plug 13 and the cable socket 10, it is convenient to send the radar pulse signal to the external monitoring system.

[0025] In this embodiment, the pressure sensor 8 is fixed on the housing 9, the pressure sensor 8 is wired to the cable socket 10 from the inside of the housing 9, and the pressure sensor 8 is connected to the external monitoring system through the cable plug 13 and the cable socket 10. Through the above structure, it is convenient to output the detection signal of the pressure sensor 8 to the external monitoring system through the cable plug 13 and the cable socket 10.

[0026] In this embodiment, the pressure detection cover includes an upper sealing cover 3 and a lower detection cover 4, the upper sealing cover 3 and the lower detection cover 4 are fixedly connected by bolts, a sealing ring 12 is provided at the connection position of the upper sealing cover 3 and the lower detection cover 4, and the connection position of the upper sealing cover 3 and the lower detection cover 4 is sealed by the sealing ring 12, and a sealing gasket 11 is fixed inside the lower detection cover 4, the top of the shell 9 abuts against the bottom of the sealing gasket 11, and the abutting position is fixed by bolts; a through hole with the same horizontal size and shape as the cable socket 10 is opened in the middle of the sealing gasket 11, and the top of the cable socket 10 passes through the through hole of the sealing gasket 11 and extends to the space above the sealing gasket 11. At the same time, the top of the cable plug 13 is also located in the space above the sealing gasket 11, and the space above the sealing gasket 11 is filled with epoxy resin glue 14, and the epoxy resin glue 14 makes the sealing gasket 11, the pressure detection cover cable socket 10 above the sealing gasket 11, the cable plug 13 and the cable 1 form a whole. The structure above the sealing gasket 11 is sealed by the sealing gasket 11 and the epoxy resin glue 14 to prevent liquid from flowing into the interior of the radar level meter through the plug-in position of the cable plug 13 and the cable socket 10 and the top of the cable plug 13, thereby preventing corrosive gases from corroding the interior of the radar level meter. The cable 1 and the cable plug 13 are fixed in the epoxy resin glue 14 without loosening or falling off, thereby improving the service life of the device.

[0027] In this embodiment, a through hole is provided on the top of the pressure detection cover for the cable 1 to pass through, and a waterproof connector 2 is fixed in the through hole, and the position where the cable 1 passes through the through hole is sealed by the waterproof connector 2. The waterproof connector 2 prevents liquid from entering the cable plug 13 from the through hole to cause a safety hazard.

[0028] In this embodiment, a lower sealing pad 11 is fixed inside the lower detection cover 4, the bottom surface of the lower sealing pad 11 is fixed to the housing 9 of the radar water level gauge body, and the cable socket 10 is inserted in the middle of the lower sealing pad 11. The lower sealing pad 11 further reduces the space for the pressure sensor 8 to detect the internal air pressure, thereby increasing the detection accuracy.

[0029] In this embodiment, a mounting bracket 5 is fixed on the outer wall of the pressure detection cover, and a mounting hole 6 is provided on the mounting bracket 5. The mounting bracket 5 is used to fix the position of the radar water level gauge.

[0030] In this embodiment, the distance from the antenna 7 of the radar water level meter to the bottom of the lower detection cover 4 is set to be 1-2 cm greater than the blind spot distance of the radar water level meter. The radar water level meter is combined with the pressure sensor 8 and arranged in the pressure detection cover. The external monitoring system is set with a formula for calculating the external real water level height by the difference between the internal air pressure and the external atmospheric pressure. When the water level rises to the inside of the pressure detection cover but does not reach the blind spot distance of the radar water level meter, the external monitoring system still uses the detection value of the radar water level meter as the basis. When the water level continues to rise, the liquid in the pressure detection cover rises to the blind spot distance of the radar water level meter, and the radar water level meter cannot receive the reflected radar pulse, resulting in the inability to monitor the water level. At this time, the pressure detection is detected by the pressure sensor 8. Measure the internal air pressure of the hood, compare the internal air pressure with the external atmospheric pressure, and calculate the height difference between the internal and external liquid levels through the difference between the internal air pressure and the external atmospheric pressure. The height of the internal liquid level is equal to the height of the liquid just entering the blind spot detected by the radar water level gauge, thereby calculating the height of the external liquid level. When the subsequent water level gradually rises, since the upper end of the pressure detection hood is a closed structure, there is air inside the pressure detection hood, and the water level inside the pressure detection hood will not continue to rise, but the internal air pressure of the pressure detection hood will further increase. Even if the water body submerges the entire device, the water body inside the pressure detection hood will not contact the radar water level gauge body, thereby preventing mud, silt or other debris from contacting the radar water level gauge body and pressure sensor 8, thereby increasing the service life of the product.

[0031] The above description is only a preferred feasible embodiment of the present utility model, and does not limit the scope of rights of the present utility model. All equivalent changes made using the contents of the present utility model specification and its drawings are included in the scope of rights of the present utility model.

Claims

1. A full-range radar water level gauge, characterized in that: The radar water level gauge comprises a body, a pressure sensor (8) and a pressure detection cover. The pressure detection cover is a cylindrical structure with a closed upper end and an open lower end. The radar water level gauge body and the pressure sensor (8) are arranged inside the pressure detection cover. The antenna (7) of the radar water level gauge body faces the lower opening of the pressure detection cover. The height of the pressure detection cover below the radar water level gauge body is greater than the blind area distance of the radar water level gauge. The radar water level gauge is fixed above the water body whose water level is to be detected. When the water level rises to the inside of the pressure detection cover and reaches the blind area distance of the radar water level gauge, the pressure sensor (8) detects the air pressure inside the pressure detection cover, and the water level height is calculated based on the difference between the internal air pressure and the external air pressure.

2. The full-range radar water level gauge according to claim 1, characterized in that: The radar water level meter body comprises a shell (9), a circuit board and a cable plug (13); the antenna (7) of the radar water level meter body is fixed inside the shell (9); a cable socket (10) connected to the antenna (7) is fixed on the shell (9); the cable plug (13) is plugged into the cable socket (10); the cable socket (10) is connected to the circuit board; a radar sensor is arranged on the circuit board; the radar sensor transmits and receives radar pulses via the antenna (7); and a cable (1) connected to the cable plug (13) passes through a pressure detection cover and extends to the outside.

3. The full-range radar water level gauge according to claim 2, characterized in that: The pressure sensor (8) is fixed on the housing (9), and the pressure sensor (8) is connected to the cable socket (10). The pressure sensor (8) is connected to an external monitoring system via the cable plug (13) and the cable socket (10).

4. The full-range radar water level gauge according to claim 2, characterized in that: A sealing gasket (11) is fixed inside the pressure detection cover, the top of the shell (9) abuts against the bottom of the sealing gasket (11), the top of the cable socket (10) passes through the sealing gasket (11) and extends into the space above the sealing gasket (11), and the space above the sealing gasket (11) is filled with epoxy resin glue (14). The epoxy resin glue (14) enables the sealing gasket (11), the pressure detection cover cable socket (10) above the sealing gasket (11), the cable plug (13) and the cable (1) to form a whole.

5. The full-range radar water level gauge according to claim 2, characterized in that: A through hole is provided on the top of the pressure detection cover for the cable (1) to pass through, a waterproof connector (2) is fixed in the through hole, and the position where the cable (1) passes through the through hole is sealed by the waterproof connector (2).

6. The full-range radar water level gauge according to claim 4, characterized in that: The pressure detection cover comprises an upper sealing cover (3) and a lower detection cover (4), a sealing pad (11) is fixed inside the lower detection cover (4), and a sealing ring (12) is provided at the connection position between the upper sealing cover (3) and the lower detection cover (4).

7. The full-range radar water level gauge according to claim 1, characterized in that: A mounting bracket (5) is fixed on the outer wall of the pressure detection cover, and a mounting hole (6) is provided on the mounting bracket (5).

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