A hydraulic self-driven field drainage metering device

Abstract

The present invention relates to a hydraulic self-driven field drainage metering device, belonging to the technical field of farmland water conservancy projects. The hydraulic self-driven field drainage metering device includes a water inlet pipe, a water tank, a siphon drainage pipe, and a metering system; the water inlet pipe communicates with the bottom of the paddy field and the bottom of the water tank, the bottom of the water tank is not higher than the bottom of the paddy field, a water inlet gate valve is arranged at the water inlet end of the water inlet pipe, the siphon drainage pipe communicates with the water tank and the external drainage ditch for drainage, and the metering system is installed in the water tank. The present invention has low cost, simple structure, easy to manufacture, easy to operate, and easy to promote. It makes full use of the buoyancy and siphon action of water to form a hydraulic self-driving force for measuring the drainage volume, which is green and environmentally friendly. When measuring the flow rate, the present invention has no restrictions on the magnitude of the flow velocity in the pipe and the condition of whether the pipe is full of flow, has few measurement limiting conditions, wide application range, and accurate metering. Moreover, the present invention only needs to set up the device in advance when measurement is required, and no personnel are required to be present throughout the process, saving manpower.

Description

Technical Field

[0001] The present invention belongs to the technical field of farmland water conservancy projects. Specifically, it relates to a hydraulic self-driven field drainage metering device. Background Art

[0002] When conducting experimental research on farmland irrigation, non-point source pollution, etc., measuring the drainage volume of farmland is a crucial link, directly affecting the results of the entire experimental research.

[0003] Currently, when measuring the drainage of a single farmland plot, most use water meters or flow meters to measure the drainage volume. When using a mechanical water meter for measurement, if the drainage flow rate fails to reach the starting flow rate of the water meter, the water meter reading will be inaccurate; when using an electromagnetic flow meter to measure drainage, there are problems such as the need for full pipe flow, high requirements for water quality and flow rate, and high prices; when using an ultrasonic flow meter to measure drainage, there are also problems such as high requirements for water quality and high prices.

[0004] Therefore, it is necessary to provide a hydraulic self-driven field drainage metering device with low cost, simple structure, easy to manufacture, easy to operate, easy to promote, no restrictions on flow rate and full pipe flow conditions, and accurate measurement. Summary of the Invention

[0005] In order to overcome the problems in the background art that the existing methods for measuring the drainage volume of a single farmland plot have inaccurate measurement, high requirements for water quality and flow rate, etc., the present invention provides a hydraulic self-driven field drainage metering device with low cost, simple structure, easy to manufacture, easy to operate, easy to promote, no restrictions on flow rate and full pipe flow conditions, and accurate measurement.

[0006] To achieve the above object, the present invention is implemented by the following technical solutions:

[0007] The present invention provides a hydraulic self-driven field drainage metering device, including a water inlet pipe 1, a water tank 2, a siphon drainage pipe 3, and a metering system; the water inlet pipe 1 communicates with the bottom of the paddy field 14 and the bottom of the water tank 2, the bottom of the water tank 2 is not higher than the bottom of the paddy field 14, a water inlet gate valve 4 is provided at the water inlet end of the water inlet pipe 1, the siphon drainage pipe 3 communicates with the water tank 2 and the outside for drainage, and the metering system is installed in the water tank 2.

[0008] The described metering system includes a control gate 5, a permanent magnet 6, a floating plate 7, a limit plate 8, and a counter 9. The control gate 5 is installed on the water inlet pipe 1 inside the water tank 2. A layer of magnet sheets is embedded at the top of the control gate 5. A permanent magnet 6 is installed above the water inlet pipe 1, directly above the control gate 5. The floating plate 7 is vertically slidably installed in the water tank 2. The floating plate 7 is connected to the control gate 5 through a floating plate flexible rope 10. A floating plate upper rod 701 is vertically provided on the upper side of the floating plate 7, and a floating plate lower rod 702 is vertically provided on the lower side. A through hole for inserting the floating plate lower rod 702 is provided on the permanent magnet 6. The limit plate 8 and the counter 9 are both installed on the side wall of the water tank 2 with adjustable heights. The limit plate 8 is directly above the floating plate 7, and the counter 9 is directly above the limit plate 8. A through hole for the floating plate upper rod 701 to pass through is provided on the limit plate 8.

[0009] The described counter 9 is used to cooperate with the floating plate 7 to work and record the number of times the floating plate 7 floats. The water inlet of the siphon drain pipe 3 is at the same height as the bottom surface of the floating plate 7 when the end of the floating plate lower rod 702 is at the bottom surface of the permanent magnet 6.

[0010] Preferably, the counter 9 includes a small ball chamber 901, a metering small ball 902, a vertical pipe 903, and a ball storage chamber 904. The metering small ball 902 is placed in the small ball chamber 901. The small ball chamber 901 and the ball storage chamber 904 are arranged side by side. The bottom surface of the small ball chamber 901 is inclined. The lowest side of the bottom surface of the small ball chamber 901 is close to the ball storage chamber 904 and is connected to the ball storage chamber 904 through a vertically arranged vertical pipe 903. A small hole facing the floating plate upper rod 701 is provided at the bottom of the vertical pipe 903 for the floating plate upper rod 701 to pass through. The diameter of the metering small ball 902 is larger than the small hole at the bottom of the vertical pipe 903.

[0011] Preferably, the buoyancy of the floating plate 7 is greater than the sum of the gravity of the valve plate of the control gate 5 and the gravity of a single metering small ball 902, ensuring that the floating plate 7 can lift the valve plate of the control gate 5 and push up the metering small ball 902 under the action of buoyancy. The gravity of the floating plate 7 is greater than the suction force between the permanent magnet 6 and the control gate 5, ensuring that the floating plate lower rod 702 can press the valve plate of the control gate 5 away from the permanent magnet 6.

[0012] Preferably, a filter screen 11 is installed at the water inlet end of the water inlet pipe 1.

[0013] Preferably, a gate slot 12 for restricting the left - right movement of the control gate 5 is provided on the control gate 5.

[0014] Preferably, a notch with a width greater than the widths of the water inlet pipe 1 and the permanent magnet 6 is provided on the bottom surface of the floating plate 7.

[0015] Preferably, the floating plate 7 is slidably installed in the water tank 2 through a sliding rod 15, and the sliding rod is adjustably installed on the water inlet pipe 1 through a hoop 16.

[0016] Preferably, a drain port 13 is provided on the side of the bottom of the water tank 2, and the drain port 13 is controlled by a manual valve.

[0017] Advantages of the present invention:

[0018] The present invention has low cost, simple structure, easy to manufacture, easy to operate, easy to promote, makes full use of the buoyancy and siphon action of water to form a hydraulic self-driving force for measuring the drainage volume, is green and environmentally friendly. When measuring the flow rate, the present invention has no restrictions on the size of the pipeline flow velocity and the condition of whether the pipe is full of flow, has few measurement limiting conditions, wide application range, and accurate measurement. Moreover, the present invention only needs to set up the device in advance when measurement is required, and no personnel are needed on the site throughout the process, saving manpower. Description of the drawings

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a cross-sectional view of the control gate during the rising process of the water level in the water tank of the present invention;

[0021] Figure 3 is a cross-sectional view of the control gate during the falling process of the water level in the water tank of the present invention.

[0022] In the figure, 1 - water inlet pipe, 2 - water tank, 3 - siphon drain pipe, 4 - inlet gate valve, 5 - control gate, 6 - permanent magnet, 7 - floating plate, 8 - limiting plate, 9 - counter, 10 - floating plate soft rope, 11 - filter screen, 12 - gate slot, 13 - drain port, 14 - paddy field, 15 - sliding rod, 16 - hoop, 701 - upper rod of floating plate, 702 - lower rod of floating plate, 901 - small ball cabin, 902 - measuring small ball, 903 - vertical pipe, 904 - ball storage chamber. Detailed implementation manners

[0023] In order to make the purpose, technical solutions and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the drawings to facilitate understanding by those skilled in the art.

[0024] As Figures 1-3 shown, the hydraulic self-driven field drainage metering device includes a water inlet pipe 1, a water tank 2, a siphon drain pipe 3, and a metering system; the water inlet pipe 1 communicates with the bottom of the paddy field 14 and the bottom of the water tank 2, the bottom of the water tank 2 is not higher than the bottom of the paddy field 14, the water inlet end of the water inlet pipe 1 is provided with an inlet gate valve 4 and a filter screen 11, the filter screen 11 is arranged on the end face of the water inlet end of the water inlet pipe 1, the inlet gate valve 4 is arranged inside the filter screen 11, the filter screen 11 prevents impurities in the paddy field 14 from entering the water inlet pipe 1 and causing blockage, the siphon drain pipe 3 communicates with the water tank 2 and the outside for drainage, and the metering system is installed in the water tank 2.

[0025] The described metering system includes a control gate 5, a permanent magnet 6, a floating plate 7, a limit plate 8, and a counter 9. The control gate 5 is installed on the water inlet pipe 1 inside the water tank 2. A gate slot 12 for restricting the left - right movement of the control gate 5 is provided on the control gate 5 to facilitate the adjustment of the control gate 5. A layer of magnet sheets is embedded at the top of the control gate 5. The permanent magnet 6 is installed above the water inlet pipe 1 and is directly above the control gate 5. The floating plate 7 is vertically slidably installed in the water tank 2. The floating plate 7 is connected to the control gate 5 through a floating plate flexible rope 10. A floating plate upper rod 701 is vertically provided on the upper side of the floating plate 7, and a floating plate lower rod 702 is vertically provided on the lower side. A through - hole for inserting the floating plate lower rod 702 is provided on the permanent magnet 6. The limit plate 8 and the counter 9 are both installed on the side wall of the water tank 2 with adjustable heights. The limit plate 8 is directly above the floating plate 7, and the counter 9 is directly above the limit plate 8. A through - hole for the floating plate upper rod 701 to pass through is provided on the limit plate 8.

[0026] The described counter 9 includes a small ball chamber 901, a metering small ball 902, a vertical pipe 903, and a ball storage chamber 904. The metering small ball 902 is placed in the small ball chamber 901. The small ball chamber 901 and the ball storage chamber 904 are arranged side by side. The bottom surface of the small ball chamber 901 is inclined. The lowest edge of the bottom surface of the small ball chamber 901 is close to the ball storage chamber 904 and is connected to the ball storage chamber 904 through a vertically arranged vertical pipe 903. The inclined bottom surface of the small ball chamber 901 ensures that the metering small ball 902 can freely roll to the bottom of the vertical pipe 903. A small hole facing the floating plate upper rod 701 is provided at the bottom of the vertical pipe 903 for the floating plate upper rod 701 to pass through. The diameter of the metering small ball 902 is larger than the small hole at the bottom of the vertical pipe 903.

[0027] The determination of the water inlet height of the siphon drain pipe 3: When the floating plate 7 descends as the water surface drops, the end of the floating plate lower rod 702 just presses the control gate 5 away from the permanent magnet 6. At this time, the height of the water surface is the water inlet height of the siphon drain pipe 3. Moreover, the installation height of the siphon drain pipe 3 is adjustable to ensure that the highest point of the siphon drain pipe 3 is not higher than the water level of the paddy field 14, ensuring that the water in the water tank 2 can be automatically discharged through the siphon drain pipe 3. The buoyancy of the floating plate 7 is greater than the sum of the gravity of the valve plate of the control gate 5 and the gravity of a single metering small ball 902, ensuring that the floating plate 7 can lift the valve plate of the control gate 5 and push up the metering small ball 902 under the action of buoyancy. The gravity of the floating plate 7 is greater than the suction force between the permanent magnet 6 and the control gate 5, ensuring that the floating plate lower rod 702 can press the valve plate of the control gate 5 away from the permanent magnet 6.

[0028] The bottom surface of the floating plate 7 is provided with a notch whose width is greater than the widths of the water inlet pipe 1 and the permanent magnet 6, ensuring that the position where the floating plate 7 loses buoyancy is as low as possible, guaranteeing that as much water as possible in the water tank 2 is discharged. The floating plate 7 is slidably installed in the water tank 2 through a slide rod 15, and the slide rod is adjustably installed on the water inlet pipe 1 through a hoop 16. The position of the floating plate 7 is adjusted according to the installation positions of the control gate 5, the permanent magnet 6, the limit plate 8 and the counter 9. A drain port 13 is arranged on the side of the bottom of the water tank 2, and the drain port 13 is controlled by a manual valve. After the one-time drainage measurement is completed, the remaining water in the water tank 2 can be manually drained, and the impurities entering the water tank 2 can also be emptied.

[0029] The working process of the present invention:

[0030] When the water level of the paddy field 14 rises rapidly due to heavy rain or other reasons and drainage is required, when the drainage metering device is installed, the inlet sluice valve 4 is in the closed state. At this time, the height of the siphon drainage pipe 3 and the height of the limit plate 8 should be set according to the water level controlled by the field surface, so that the heights of both are equal to the water level controlled by the field surface; at the same time, the height of the counter 9 and the length of the floating plate soft rope 10 are set, so that when the floating plate 7 floats up to the limit plate 8, the upper rod 701 of the floating plate can push a single metering ball 902 into the ball storage chamber 904 through the vertical pipe 903, and at the same time, the door panel of the control gate 5 is suctioned onto the permanent magnet 6.

[0031] When the drainage metering starts, the inlet sluice valve 4 is opened, and the water in the field enters the water tank 2 through the filter screen 11 and the water inlet pipe 1, and the water level in the tank starts to rise. As a result, the floating plate 7 floats due to the buoyancy force and starts to rise. During the process of the water level rising, since the water level does not reach the height of the siphon drainage pipe 3, the water in the water tank 2 is never drained.

[0032] When the water level in the water tank 2 rises to the top of the siphon drainage pipe 3, the water level in the tank reaches the maximum. At this time, due to the action of the limit plate 8, the floating plate 7 suspends in the water and cannot continue to rise. The upper rod 701 of the floating plate pushes a single metering ball 902 into the ball storage chamber 904 through the vertical pipe 903; the door panel of the control gate 5 is also attracted to the permanent magnet 6 under the pulling force of the floating plate soft rope 10 of the floating plate, closing the control gate 5; at the same time, due to the siphon action of the siphon drainage pipe 3, the water in the water tank 2 gradually drains to the outside of the field through the siphon drainage pipe 3 to the right, and the water level in the water tank 2 starts to gradually drop.

[0033] During the process of the water level in the water tank 2 dropping, the control gate 5 is always in the closed state due to the suction force of the permanent magnet 6; the metering ball 902 for counting will roll out of the ball chamber 901 again due to the separation of the upper rod 701 of the floating plate. Since the diameter of the vertical pipe 903 is slightly larger than or equal to the diameter of the ball, only one ball will roll out to the bottom of the vertical pipe 903.

[0034] When the water level in the water tank 2 drops to the position of the water inlet of the siphon drain pipe 3, the drainage process of the water in the water tank 2 ends. At this time, the floating plate 7 is gradually exposed in the water tank 2, the buoyancy of the floating plate 7 disappears, and due to its own gravity, the floating plate 7 pushes the gate plate of the control gate 5 off the permanent magnet 6 through the lower rod 702 of the floating plate. At this time, the control gate 5 is reopened, so as to enter the measurement of the next water inlet and drainage cycle of the water tank 2.

[0035] When the final farmland water level reaches the set water level, that is, reaches the height of the siphon drain pipe 3, the water in the water tank 2 no longer drains, and the entire drainage process ends. Calculate the number of small balls falling into the ball storage chamber 904, which is the number of times the water tank 2 drains; the volume of water drained by the water tank 2 each time can be measured with a graduated cylinder or a scale. The product of the number of times the water tank 2 drains and the volume of water drained each time, plus the volume of water in the water tank 2, is the amount of water drained from the field surface, and thus the drainage volume of the entire field drainage process can be obtained.

[0036] After selecting the water tank 2 for the experiment, the experimental records are as follows (the capacity between the water inlet of the siphon drain pipe 3 and the bottom of the water tank 2 is 1L, and the capacity between the water inlet of the siphon drain pipe 3 and the drainage point of the siphon drain pipe 3 is 4L):

[0037] Experiment number Number of balls Calculation result of displacement Actual measured value of displacement Deviation 1 5 21L 20.9L 0.48％ 2 6 25L 24.8L 0.80％ 3 8 33L 32.8L 0.61％ 4 3 13L 12.95L 0.38％ 5 5 21L 20.92L 0.38％

[0038] From the experimental data, it can be seen that the measurement deviation of the drainage volume of this device is small. The invention has low cost, simple structure, easy to manufacture, easy to operate, easy to promote, makes full use of the buoyancy of water and the siphon effect to form a hydraulic self-driving force for measuring the drainage volume, is green and environmentally friendly. When the invention measures the flow rate, there are no restrictions on the size of the pipeline flow velocity and the condition of whether the pipe is full of flow, the measurement limit conditions are few, the applicable range is wide, and the measurement is accurate. Moreover, the invention only needs to set up the device in advance when measurement is required, and no personnel are needed on the site throughout the process, saving manpower.

[0039] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in terms of form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A hydraulic self-driven field drainage metering device, characterized in that: The described hydraulic self-driven field drainage metering device includes a water inlet pipe (1), a water tank (2), a siphon drain pipe (3), and a metering system. The water inlet pipe (1) communicates with the bottom of the paddy field (14) and the bottom of the water tank (2). The bottom of the water tank (2) is not higher than the bottom of the paddy field (14). An inlet sluice valve (4) is arranged at the water inlet end of the water inlet pipe (1). The siphon drain pipe (3) communicates with the water tank (2) and the outside for drainage. The metering system is installed in the water tank (2). The metering system includes a control gate (5), a permanent magnet (6), a floating plate (7), a limit plate (8), and a counter (9). The control gate (5) is installed on the water inlet pipe (1) inside the water tank (2). A layer of magnet sheet is embedded at the top of the control gate (5). A permanent magnet (6) is installed above the water inlet pipe (1). The permanent magnet (6) is directly above the control gate (5). The floating plate (7) is vertically slidably installed in the water tank (2). The floating plate (7) is connected to the control gate (5) through a floating plate flexible rope (10). A floating plate upper rod (701) is vertically arranged on the upper side of the floating plate (7), and a floating plate lower rod (702) is vertically arranged on the lower side. A through hole for inserting the floating plate lower rod (702) is arranged on the permanent magnet (6). The limit plate (8) and the counter (9) are both installed on the side wall of the water tank (2) with adjustable height. The limit plate (8) is directly above the floating plate (7), and the counter (9) is directly above the limit plate (8). A through hole for the floating plate upper rod (701) to pass through is arranged on the limit plate (8). The counter (9) is used to cooperate with the floating plate (7) to work and record the number of times the floating plate (7) floats. The water inlet of the siphon drain pipe (3) is at the same height as the bottom surface of the floating plate (7) when the end of the floating plate lower rod (702) is at the bottom surface of the permanent magnet (6).

2. The hydraulic self-driven field drainage metering device according to claim 1, wherein: The counter (9) includes a small ball chamber (901), a metering small ball (902), a vertical pipe (903), and a ball storage chamber (904). The metering small ball (902) is placed in the small ball chamber (901). The small ball chamber (901) and the ball storage chamber (904) are arranged side by side. The bottom surface of the small ball chamber (901) is inclined. The lowest side of the bottom surface of the small ball chamber (901) is close to the ball storage chamber (904) and is connected to the ball storage chamber (904) through a vertically arranged vertical pipe (903). A small hole facing the floating plate upper rod (701) is arranged at the bottom of the vertical pipe (903) for the floating plate upper rod (701) to pass through. The diameter of the metering small ball (902) is larger than the small hole at the bottom of the vertical pipe (903).

3. The hydraulic self-driven field drainage metering device according to claim 2, wherein: The buoyancy of the floating plate (7) is greater than the sum of the gravity of the valve plate of the control gate (5) and the gravity of a single metering small ball (902), ensuring that the floating plate (7) can lift the valve plate of the control gate (5) and push up the metering small ball (902) under the action of buoyancy. The gravity of the floating plate (7) is greater than the suction force between the permanent magnet (6) and the control gate (5), ensuring that the floating plate lower rod (702) can press the valve plate of the control gate (5) away from the permanent magnet (6).

4. A hydraulic self-driven field drainage metering device according to claim 1, 2 or 3, characterized in that: A filter screen (11) is installed at the water inlet end of the water inlet pipe (1).

5. A hydraulic self-driven field drainage metering device according to claim 1, 2 or 3, characterized in that: A gate slot (12) for restricting the left and right movement of the control gate (5) is arranged on the control gate (5).

6. A hydraulic self-driven field drainage metering device according to claim 1, 2 or 3, characterized in that: The bottom surface of the floating plate (7) is provided with a notch whose width is greater than the widths of the water inlet pipe (1) and the permanent magnet (6).

7. A hydraulic self-driven field drainage metering device according to claim 1, 2 or 3, characterized in that: The floating plate (7) is slidably installed in the water tank (2) through a slide bar (15), and the slide bar is adjustably installed on the water inlet pipe (1) through a hoop (16).

8. A hydraulic self-driven field drainage metering device according to claim 5, characterized in that: The floating plate (7) is slidably installed in the water tank (2) through a slide bar (15), and the slide bar is adjustably installed on the water inlet pipe (1) through a hoop (16).

9. A hydraulic self-driven field drainage metering device according to claim 1, 2, 3 or 8, characterized in that: A drain port (13) is provided on the side of the bottom of the water tank (2), and the drain port (13) is controlled by a manual valve.

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