A sensor device for measuring water level in a field

Abstract

The present invention relates to the field of sensor technology, and in particular to a sensor device for measuring field water level, comprising a positioning buckle, an external device and an internal device, wherein the external device is provided with a first cavity, the positioning buckle and the internal device are both arranged in the first cavity, the top of the external device is connected with the top of the internal device through the positioning buckle, a first through hole is arranged in the middle of the outer surface of the external device, a second cavity is arranged inside the internal device, a detection area is arranged at the top of the second cavity, and the detection area seals the top of the second cavity. The device of the present invention is convenient, fast, simple and reliable during installation in farmland; during use, it is easy to maintain, has low power consumption, stable operation, and real-time and accurate data transmission.

Description

Technical Field

[0001] The invention relates to the technical field of sensors, and in particular to a sensor device for measuring field water level. Background Art

[0002] Farmland water level is one of the important factors affecting agricultural production. Different crops have different tolerances to irrigation water. Once the tolerance range of crops is exceeded, the normal growth of crops will be inhibited, resulting in reduced yields, or even death of crops. Therefore, accurate and real-time knowledge of farmland water level data is of great significance to agricultural production practice. Through online real-time monitoring of farmland water level, farmers can be guided to irrigate rationally, so that water resources can be effectively used to achieve high crop yields.

[0003] Existing farmland water level sensors are precise and complex in structure; however, due to the harsh actual agricultural production environment, farmland water level sensors require long-term maintenance. Precision and complex structures increase the difficulty of maintenance and require professional personnel to perform maintenance, which increases the difficulty of agricultural production.

[0004] Chinese patent CN111174873A discloses a patent named photoelectric wireless paddy field water level sensor, such as Figure 1 to Figure 2 As shown, its technical points are: the photoelectric wireless paddy field water level sensor includes: a cylinder cover, a support body, a control chamber body, an optical path cylinder body and a water inlet body; the cylinder cover is located on the upper part of the control chamber body; the support body is connected to the side of the control chamber body; an optical path cylinder channel is provided in the middle of the control chamber body, and a sensor circuit board is installed on the rear side; the first end of the optical path cylinder body is connected to the laser emitter, and the second end is connected to and communicated with the top of the water inlet body; the sensor circuit board is electrically connected to the antenna, battery, laser emitter, light receiver and switch; the water inlet body is provided with a filter membrane, and a light receiver is provided at the bottom to coaxially face the laser emitter, and the light intensity changes when the light passes through different water depths to obtain the current water level.

[0005] Chinese patent CN109030786A discloses a patent entitled a device and method for measuring water for farmland irrigation. Figure 3As shown, it includes several soil moisture sensors, water level sensors, calibration mechanisms, solar power supply mechanisms, microcontrollers and data management mechanisms. Several soil moisture sensors are all set in farmland, and the water level sensor is installed in the farmland through the calibration mechanism. The water level sensor and several soil moisture sensors are all connected to the microcontroller, the solar power supply mechanism is connected to the microcontroller, and the microcontroller is connected to the data management mechanism through a wireless module. The calibration mechanism includes a base, a cylinder made of transparent material and a calibrator. The base is horizontally placed in the farmland, and the cylinder is vertically placed on the base. The side wall of the cylinder is provided with a water-permeable hole communicating with the inner cavity of the cylinder, and the inner cavity of the cylinder is provided with a ruler. The calibrator is placed on the upper end face of the cylinder, and the water level sensor is inserted into the cylinder, and the lower end of the water level sensor is close to the top of the base. The number of water-permeable holes is multiple, and the multiple water-permeable holes are evenly distributed on the side wall of the cylinder. The base includes a bottom plate and a fixed column, the upper end of the fixed column is connected to the bottom plate, the lower end of the fixed column is inserted into the soil of the farmland, and the lower end of the bottom plate is close to the soil of the farmland. The diameter of the fixing column gradually decreases from the upper end to the lower end. Summary of the invention

[0006] The present invention aims at solving the problems in the background technology and provides a sensor device for measuring water level in a field.

[0007] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0008] A sensor device for measuring field water level comprises an external device and an internal device. The external device is provided with a first cavity, the length of the external device is greater than the length of the internal device, a first through hole for the inlet and outlet of farmland water is provided in the middle of the outer surface of the external device, a second cavity is provided inside the internal device, a detection area is provided on the top of the second cavity, the detection area seals the top of the second cavity, so that when water seals the bottom port of the internal device, the second cavity is in a sealed state, the bottom of the internal device and the bottom of the external device are both set to open structures, impurities in the farmland water enter the first cavity through the first through hole, the impurities can be effectively precipitated at the bottom of the first cavity, and the impurities are prevented from clogging the first through hole and the bottom port of the internal device.

[0009] Preferably, the sensor device further comprises a positioning buckle, which is arranged in the first cavity and connects the external device with the internal device.

[0010] Preferably, a cover is provided on the top of the external device, and a mounting hole is provided on the cover. The positioning buckle is installed on the cover through the mounting hole. The positioning buckle consists of a bolt with an internal threaded hole, a screw matching the internal threaded hole, and a buckle for fixing the internal device. The bolt is provided in the mounting hole, and the screw is connected to the buckle. The internal device can be adjusted up and down by rotating the bolt exposed to the outside of the cover, so that the lower port of the inner cavity of the internal device can be at the same height as the surface of the farmland, which can be considered as the zero water level of the farmland.

[0011] Preferably, the outer surface of the external device is provided with a second through hole, and the second through hole is provided at the top of the external device.

[0012] Preferably, a mounting plate is provided in the detection area, a water level sensor is provided on the mounting plate, and the water level sensor includes a first sensing hole, a second sensing hole and a communication cable.

[0013] Preferably, the first sensing hole is connected to the first cavity, the second sensing hole is connected to the second cavity, the communication cable is led out from the detection area of ​​the second cavity, and then drawn back to the outside of the sensor device through the second through hole.

[0014] Alternatively, the water level sensor (501) may be arranged outside the sensor device, the water level sensor comprising a first sensing hole and a second sensing hole, the second sensing hole being connected to the second cavity via an air pipe, the first sensing hole being connected to atmospheric pressure, and the air pipe penetrating the mounting plate to connect to the water level sensor.

[0015] Preferably, it further comprises a positioning sleeve, wherein the positioning sleeve is provided with a flange, the positioning sleeve is fixed on the farmland through the flange, and the external device is sleeved inside the positioning sleeve.

[0016] Furthermore, the present invention also provides a method for measuring field water level using a sensor device. The water level sensor is connected to the second cavity through a second sensing hole and to the first cavity through a first sensing hole. Under different water levels, a pressure difference is formed between the second cavity and the ambient atmospheric pressure. The water level sensor converts the pressure difference into a measurable voltage signal, transmits it to a device connected to the water level sensor device through a communication cable, and then obtains the corresponding relationship between the pressure difference and the water level through ADC acquisition and MCU calculation of an external device to obtain the current water level value.

[0017] The present invention has significant technical effects due to the adoption of the above technical solution:

[0018] The present invention has the advantages of simple structure, easy installation, easy maintenance, low power consumption, stable operation and long service life. In addition, the data transmission is real-time and accurate, the structure is simple, easy to install and maintain, and it can realize online monitoring of water level and meet actual production needs, and has good application prospects.

[0019] The invention is convenient, fast, simple and reliable during installation in farmland; it is easy to maintain during use and only requires simple cleaning, which greatly improves the practicality of the water level sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of comparative document 1 in the background technology.

[0021] Figure 2 It is an exploded view of comparative document 1 in the background technology.

[0022] Figure 3 It is a structural diagram of comparative document 2 in the background technology.

[0023] Figure 4 It is a schematic diagram of the external structure of Example 1 of the present invention.

[0024] Figure 5 It is a schematic diagram of the internal structure of Example 1 of the present invention.

[0025] Figure 6 It is a schematic diagram of the use of embodiment 1 of the present invention.

[0026] Figure 7 It is a schematic diagram of the internal structure of Example 2 of the present invention.

[0027] The names of the parts indicated by the numerical labels in the accompanying drawings are as follows: 1-farmland, 2-positioning sleeve, 21-flange, 3-external device, 301-cover, 3011-mounting hole, 302-second through hole, 303-first through hole, 304-first cavity, 4-adjusting buckle, 401-bolt, 402-screw, 403-clip, 5-internal device, 51-detection area, 511-mounting plate, 501-water level sensor, 5012-first sensing hole, 5011-second sensing hole, 5013-communication cable, 502-second cavity, 503-trachea. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] Example 1

[0030] like Figure 4-6As shown, a sensor device for measuring field water level includes a position-adjusting buckle 4, an external device 3 and an internal device 5, the external device 3 is provided with a first cavity 304, the position-adjusting buckle 4 and the internal device 5 are both arranged in the first cavity 304, the length of the external device 3 is greater than the length of the internal device 5, the top of the external device 3 is connected to the top of the internal device 5 through the position-adjusting buckle 4, a first through hole 303 for water in and out of the farmland 1 is provided in the middle of the outer surface of the external device 3, a second cavity 502 is provided inside the internal device 5, a detection area 51 is provided at the top of the second cavity 502, the detection area 51 seals the top of the second cavity 502, and the bottom of the internal device 5 and the bottom of the external device 3 are both arranged as open structures.

[0031] Among them, a cover 301 is provided on the top of the external device 3, and a mounting hole 3011 is provided on the cover 301. The adjusting buckle 4 is installed on the cover 301 through the mounting hole 3011. The adjusting buckle 4 consists of a bolt 401 with an internal threaded hole, a screw 402 matched with the internal threaded hole and a buckle 403 for fixing the internal device 5. The bolt 401 is set in the mounting hole 3011, and the screw 402 is connected with the buckle 403. By rotating the bolt 401 of the adjusting buckle 4 exposed outside the cover 301, the internal device 5 can be raised or lowered.

[0032] In addition, a second through hole 302 is provided on the outer surface of the external device 3 of the present embodiment, and the second through hole 302 is provided at the top of the external device 3. A mounting plate 511 is provided in the detection area 51, and a water level sensor 501 is provided on the mounting plate 511. The water level sensor 501 includes a first sensing hole 5012, a second sensing hole 5011 and a communication cable 5013. The first sensing hole 5012 is connected to the first cavity 304, and the second sensing hole 5011 is connected to the second cavity 502. The communication cable 5013 of the water level sensor 501 is derived from the detection area (51) of the second cavity (502).

[0033] Instructions for use: The bottom portion of the external device 3 is arranged on the farmland 1. When the water in the farmland 1 enters the first cavity 304 through the first through hole 303 of the external device 3, since the second through hole 302 is arranged on the upper portion of the external device 3, the water level in the first cavity 304 is the same as the water level in the farmland 1 (since there is no air pressure difference). Since the upper portion of the second cavity 502 of the internal device 5 is sealed, and the water seals the bottom port of the internal device 5, when the water level in the farmland 1 rises, the water level in the second cavity 502 will also slowly rise, thereby causing the volume of the sealed second cavity 502 to decrease, thereby causing the air pressure in the second cavity 502 to increase. The air pressure inside the second cavity 502 changes with the change of the water level in the paddy field.

[0034] Working mode of the water level sensor 501: The water level sensor 501 is connected to the second cavity 502 through the second sensing hole 5011, and is connected to the first cavity 304 (equivalent to the ambient atmospheric pressure) through the first sensing hole 5012. Under different water levels, the gas compression amount in the second cavity 502 is different, and the air pressure is also different. Therefore, a pressure difference is formed between the second cavity 502 and the ambient atmospheric pressure. According to the characteristics of the water level sensor 501: there is a linear relationship between the pressure difference and the water level. The water level sensor 501 converts the pressure difference into a measurable voltage signal, and transmits it to the device to which the water level sensor 501 is connected through the communication cable 5013. Then, through the ADC acquisition and MCU calculation of the external device, the corresponding relationship between the pressure difference and the water level can be obtained, and the current water level value can be further obtained.

[0035] When the water level sensor 501 is in use, impurities in the water of the farmland 1 will enter the first cavity 304 along with the water flow. Since the part where the external device 2 is fixed to the farmland 1 is hollow, solid impurities in the water will slowly settle to the bottom of the first cavity 304 and will not block the first through hole 303. When there are too many impurities in the first cavity 304, the impurities will settle into the first cavity 304 where the external device 3 is fixed to the farmland 1, making it difficult for the bottom port of the internal device 5 to be blocked.

[0036] Example 2

[0037] like Figure 7 As shown, the difference between this embodiment and embodiment 1 is that the water level sensor 501 is not arranged inside the internal device 5. Instead, the water level sensor 501 is arranged outside the sensor device. The water level sensor includes a first sensing hole 5012 and a second sensing hole 5011. The second sensing hole 5012 is connected to the second cavity 502 through the air pipe 503. The first sensing hole 5012 is connected to the atmospheric pressure. A mounting plate 511 is arranged in the detection area 51. The air pipe 503 penetrates the mounting plate 511 and is led out through the through hole of the external device 3 to connect to the water level sensor 501.

[0038] When there is water in the farmland 1, the water enters the first cavity 304 through the first through hole 303. Since the upper part of the external device 3 has the second through hole 302, the water level of the first cavity 304 is the same as that of the farmland 1. Since the upper part of the second cavity 502 of the internal device 5 is sealed, the second cavity 502 is a closed space. The water level sensor 501 detects the air pressure in the second cavity 502 through the air pipe 503 inserted in the first sensing hole 5012 and the second sensing hole 5011, and obtains the current water level value of the farmland 1 through conversion and calculation. It is further concluded that the air pressure in the second cavity 502 changes with the change of the water level in the paddy field.

[0039] Example 3

[0040] The difference between this embodiment and the first embodiment is that: the present embodiment further comprises a positioning sleeve 2 , the positioning sleeve 2 is provided with a flange 21 , the positioning sleeve 2 is fixed on the farmland 1 by the flange 21 , and the external device 3 is sleeved inside the positioning sleeve 2 .

[0041] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A sensor device for measuring field water level, comprising an external device (3) and an internal device (5), characterized in that: The external device (3) is provided with a first cavity (304), the internal devices (5) are all arranged in the first cavity (304), a first through hole (303) for the inlet and outlet of farmland water is provided in the middle of the outer surface of the external device (3), a second cavity (502) is provided inside the internal device (5), a detection area (51) is provided at the top of the second cavity (502), the detection area (51) at the top of the second cavity (502) is sealed, the bottom of the internal device (5) and the bottom of the external device (3) are both arranged as an open structure, and the length of the external device (3) is greater than the length of the internal device (5); The sensor device further comprises a positioning buckle (4), the positioning buckle (4) being arranged in the first cavity (304), the positioning buckle (4) connecting the external device (3) and the internal device (5); A cover (301) is provided on the top of the external device (3), and a mounting hole (3011) is provided on the cover (301). The position adjustment buckle (4) is installed on the cover (301) through the mounting hole (3011). The position adjustment buckle (4) is composed of a bolt (401) with an internal threaded hole, a screw rod (402) matched with the internal threaded hole, and a buckle (403) for fixing the internal device (5). The bolt (401) is arranged in the mounting hole (3011), and the screw rod (402) is connected to the buckle (403). The bolt (401) of the position adjustment buckle (4) located outside the cover (301) is rotated to adjust the height of the internal device (5). It also comprises a positioning sleeve (2), the positioning sleeve (2) being provided with a flange (21), and the positioning sleeve (2) being fixed on the farmland (1) via the flange (21).

2. A sensor device for measuring field water level according to claim 1, characterized in that: The outer surface of the external device (3) is provided with a second through hole (302), and the second through hole (302) is arranged on the top of the external device (3).

3. A sensor device for measuring field water level according to claim 2, characterized in that: A mounting plate (511) is provided in the detection area (51), and a water level sensor (501) is provided on the mounting plate (511). The water level sensor (501) comprises a first sensing hole (5012), a second sensing hole (5011), and a communication cable (5013).

4. A sensor device for measuring field water level according to claim 3, characterized in that: The first sensing hole (5012) is connected to the first cavity (304), the second sensing hole (5011) is connected to the second cavity (502), and the communication cable (5013) is led out from the detection area (51) of the second cavity (502) and then led out to the outside of the sensor device through the second through hole (302).

5. A sensor device for measuring field water level according to claim 3, characterized in that: Also included is a water level sensor (501) arranged outside the sensor device, the water level sensor (501) comprising a first sensing hole (5012) and a second sensing hole (5011), the second sensing hole (5011) being connected to the second cavity (502) via an air pipe (503), the first sensing hole (5012) being connected to atmospheric pressure, and the air pipe (503) penetrating the mounting plate (511) to be connected to the water level sensor (501).

6. A method for measuring field water level based on the sensor device according to any one of claims 1 to 5, characterized in that: The water level sensor is connected to the second cavity through the second sensing hole and to the first cavity through the first sensing hole. Under different water levels, a pressure difference is formed between the second cavity and the ambient atmospheric pressure. The water level sensor converts the pressure difference into a measurable voltage signal, which is transmitted to the device connected to the water level sensor device through a communication cable. The corresponding relationship between the pressure difference and the water level is obtained through ADC acquisition and MCU calculation of the external device to obtain the current water level value.

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