Load cell rain gauge calibrator

Abstract

The application belongs to the field of rainfall measurement, and specifically discloses a weighing type rainfall calibration instrument, which comprises a portable box, a first weighing module, a second weighing module, a water storage bucket and a metering pump are arranged in the portable box, the water storage bucket is placed on the first weighing module, the metering pump is placed on the second weighing module, a water inlet is formed in the portable box, a water outlet pipe is connected to a water outlet end of the metering pump, the water outlet pipe and the water inlet are detachably connected, and an adjusting piece for adjusting the opening size of the water inlet is installed on the outer wall of the portable box; a water inlet pipe is connected to a water inlet end of the metering pump, the water inlet pipe is used for extending into the water storage bucket, a support for supporting the water inlet pipe is installed in the portable box, and the water inlet pipe is detachably connected to the support. The application can solve the problems that water may be left in the pump, leading to inaccurate measurement, and the residual water may also affect the next calibration measurement.

Description

Technical Field

[0001] This invention belongs to the field of rainfall measurement, and specifically relates to a weighing-type rainfall calibrator. Background Technology

[0002] With increasing attention being paid to agricultural intelligence, my country has made historic progress in the construction of its weather station network, achieving full coverage of automatic weather stations in nearly 40,000 townships. Rain gauges in these automatic weather stations collect rainfall data in real time and upload accurate rainfall data for different time periods, providing support for local flood control and disaster relief decision-making. In actual measurement processes, ensuring the normal operation and accuracy of rain gauges is a basic requirement for grassroots staff. To ensure the smooth progress of observation work, rain gauges need to be calibrated / verified on-site regularly.

[0003] The rainfall calibration process is as follows: water is injected into the rain gauge at different flow rates to simulate different rainfall amounts and intensities. The injected water volume is compared with the water volume detected by the rain gauge to determine the accuracy of the measurement. In existing technologies, rain gauges are usually manually filled with water during water injection tests. However, because different people inject water at different speeds, it is easy for the same rain gauge to have a certain error in measurement. To reduce human error in water injection and improve the efficiency of water injection work, existing technologies use corresponding rain gauge calibration instruments.

[0004] Existing rain gauge calibration instruments include a pump and a water supply tank. The pump's inlet is connected to the water supply tank, and the pump's outlet is connected to the rain gauge's inlet. By adjusting the pump's power, the pumping and draining speed can be adjusted, reducing errors caused by manual water filling. However, residual water may remain inside the pump, leading to inaccurate measurements, and the residual water can also affect subsequent calibration measurements. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a weighing-type rain gauge calibrator to solve the problem that residual moisture may remain inside the pump, leading to inaccurate measurements, and that residual moisture may also affect the next calibration measurement.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A weighing-type rain gauge includes a portable case containing a first weighing module, a second weighing module, a water storage tank, and a metering pump. The water storage tank is placed on the first weighing module, and the metering pump is placed on the second weighing module. The portable case has a water inlet, and the outlet of the metering pump is connected to an outlet pipe. The outlet pipe and the water inlet are detachably connected. An adjusting device for adjusting the size of the water inlet opening is installed on the outer wall of the portable case. The inlet of the metering pump is connected to an inlet pipe that extends into the water storage tank. A bracket for supporting the inlet pipe is installed inside the portable case, and the inlet pipe is detachably connected to the bracket.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] 1. The water storage tank and metering pump are weighed separately using the first and second weighing modules. The initial weight and the weight after calibration in the water storage tank are measured to determine the drainage volume. The initial weight and the weight after calibration of the metering pump are measured to determine the residual water volume in the metering pump. If the weight after calibration of the metering pump is less than its initial weight, the difference between the drainage volume and the metering pump weight is the amount of water entering the rain gauge. If the weight after calibration of the metering pump is greater than its initial weight, the difference between the drainage volume and the metering pump weight is the amount of water entering the rain gauge. If the weight after calibration of the metering pump is equal to its initial weight, the drainage volume is the amount of water entering the rain gauge. By weighing them separately, the possibility of inaccurate calibration due to residual water in the metering pump is reduced.

[0010] 2. The water outlet pipe can be detachably connected to the water inlet, and the water inlet pipe is inserted into the water storage tank through the support bracket. That is, the water inlet pipe and the water outlet pipe can be assembled only when in use, and can be stored in the portable case when not in use, which facilitates the storage or replacement of the metering pump and the water storage tank in the metering pump.

[0011] 3. By adjusting the flow rate of the metering pump, different rainfall amounts can be simulated. Under the same flow rate of the metering pump, the opening of the water inlet can be adjusted by adjusting the regulating component to simulate different rainfall intensities, thereby achieving simulation calibration in multiple ways. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0013] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0014] Figure 3 for Figure 2 Enlarged view of section B.

[0015] Figure 4 for Figure 1 Side view of the mounting ring.

[0016] In the diagram: 1. Portable case; 2. Water storage tank; 3. First weighing module; 4. Second weighing module; 5. Base plate; 6. Metering pump; 7. Water outlet pipe; 8. Water inlet pipe; 9. Lower support rod; 10. Upper support rod; 11. Mounting ring; 12. Vertical rod; 13. Hook; 14. Tapered tube; 15. Connecting ring; 16. Sliding rod; 17. Baffle plate; 18. Pressure rod; 19. Sealing plate; 20. Water injection pipe; 21. Water injection port; 22. Rubber ring; 23. Flared part; 24. Limiting ring; 25. Limiting block; 26. Spring; 27. Locking rod; 28. Fixing block. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings, and specific embodiments are given.

[0018] like Figure 1 As shown, the weighing-type rain gauge includes a portable case 1. The portable case 1 contains a first weighing module 3, a second weighing module 4, a water storage tank 2, and a metering pump 6. The water storage tank 2 is placed on the first weighing module 3, and the metering pump 6 is placed on the second weighing module 4. Specifically, the water storage tank 2 can be a measuring cylinder from the prior art. The second weighing module 4 also has a mounting bracket, which includes a base plate 5. The metering pump 6 is fixed on the base plate 5. Both the first weighing module 3 and the second weighing module 4 are electronic scales from the prior art.

[0019] The portable case 1 has a water inlet 21, and a water inlet pipe 20 is fixed inside the water inlet 21. The water inlet pipe 20 is used to guide water into the rain gauge. The outlet end of the metering pump 6 is connected to a water outlet pipe 7. The water outlet pipe 7 and the water inlet 21 are detachably connected. Specifically, in conjunction with... Figure 2 As shown, a connecting ring 15 is fixed to the outer wall of the end of the water outlet pipe 7, and the connecting ring 15 is bolted to the carrying case 1. A sealing element is installed at the end of the water outlet pipe 7 to seal the connection between the water outlet pipe 7 and the water inlet 21. Specifically, the sealing element includes a tapered pipe 14 fixed to the end of the water outlet pipe 7. The small-diameter end of the tapered pipe 14 is a free end, and the outer diameter of the small-diameter end of the tapered pipe 14 is smaller than the inner diameter of the water inlet 21, while the outer diameter of the large-diameter end of the tapered pipe 14 is larger than the inner diameter of the water inlet 21. (Combined with...) Figure 3 As shown, the sealing element also includes a rubber ring 22 fixed to the inner wall of the water inlet 21. The inner diameter of the rubber ring 22 is smaller than the outer diameter of the small diameter end of the tapered tube 14. The inner wall of the small diameter end of the tapered tube 14 is provided with a flared portion 23. A limiting ring 24 for fitting against the flared portion 23 is fixed to the inner wall of the rubber ring 22.

[0020] Combination Figure 2As shown, the outer wall of the portable case 1 is equipped with an adjusting component for adjusting the opening size of the water inlet 21. Specifically, the adjusting component includes a baffle 17 slidably connected to the outer wall of the portable case 1. The baffle 17 is used to close the water inlet pipe 20. Specifically, a slide rod 16 is slidably connected vertically to the outer wall of the portable case 1, and the baffle 17 is fixed to the end of the slide rod 16. A cylinder for driving the slide rod 16 to slide is installed on the outer wall of the portable case 1. A pressure rod 18 is threaded onto the baffle 17. One end of the pressure rod 18 facing the outer wall of the portable case 1 extends through the baffle 17 and is fixed with a sealing plate 19. The sealing plate 19 is used to press against the opening of the water inlet pipe 20 to achieve the sealing requirement. Specifically, the sealing plate 19 includes a rigid sheet and a rubber pad fixed on the rigid sheet. The rubber pad is located on the side of the rigid sheet facing away from the baffle 17.

[0021] The metering pump 6 has an inlet pipe 8 connected to its inlet end. The inlet pipe 8 is used to extend into the water storage tank 2. The portable case 1 is equipped with a bracket for supporting the inlet pipe 8. The inlet pipe 8 is detachably connected to the bracket. Specifically, the bracket includes an upper support rod 10 and a lower support rod 9 that slide vertically. In actual use, the upper support rod 10 and the lower support rod 9 can be driven to slide by a cylinder in the prior art, or they can both be electric telescopic rods with telescopic function.

[0022] The upper support rod 10 is installed on the top of the carrying case 1, and the lower support rod 9 is installed on the bottom of the carrying case 1. The lower end of the upper support rod 10 and the upper end of the lower support rod 9 are both fixed with mounting rings 11 for the water inlet pipe 8 to pass through. The mounting rings 11 are equipped with locking devices for limiting the position of the water inlet pipe 8. Specifically, in conjunction with... Figure 4 As shown, the locking component includes a locking rod 27 that is radially slidably connected to the mounting ring 11. A fixing block 28 is fixed to the end of the locking rod 27 located inside the mounting ring 11, and a limiting block 25 is fixed to the end of the locking rod 27 located outside the mounting ring 11. A magnetic block is fixed on the fixing block 28. An electromagnet for attracting or repelling the magnetic block is fixed to the inner wall of the mounting ring 11. A spring 26 is fixed between the limiting block 25 and the inner wall of the mounting ring 11.

[0023] The mounting bracket also includes a vertical rod 12 fixed to the base plate 5, a hook 13 fixed to the vertical rod 12, and hanging rings fixed to the water inlet pipe 8 and the water outlet pipe 7, which are used to hang on the hook 13.

[0024] For routine storage, the inlet pipe 8 and outlet pipe 7 are both hung on the hook 13 via hanging rings, and the metering pump 6 and water storage tank 2 are stored inside the portable case 1. When needed, the portable case 1 is placed near the rain gauge, with the opening of the water inlet pipe 20 aligned with the rain gauge's inlet. A certain amount of clean water is poured into the water storage tank 2, and the initial weight d1 of the water storage tank 2 is measured using the first weighing module 3. The initial weight d2 of the metering pump 6 and the entire mounting frame is measured using the second weighing module 4.

[0025] Insert the end wire of the water inlet pipe 8 into the mounting ring 11 of the lower support rod 9, and then into the mounting ring 11 of the upper support rod 10. Slide the upper support rod 10 and the lower support rod 9 to adjust the position of the two mounting rings 11, thereby adjusting the height of the water inlet pipe 8 so that the end of the water inlet pipe 8 is inserted into the water storage tank 2. Then activate the electromagnet so that the electromagnet repels the magnetic block on the fixing block 28. The fixing block 28 moves toward the water inlet pipe 8 and blocks the water inlet pipe 8, thereby limiting and locking the water inlet pipe 8 and preventing the water inlet pipe 8 from shaking during use and causing water to splash out.

[0026] The water outlet pipe 7 is installed into the water inlet 21. Specifically, the tapered pipe 14 is inserted into the water inlet 21, with its end abutting against the rubber ring 22. The rubber ring 22 is pulled so that it fits tightly against the outer wall of the tapered pipe 14, while the limiting ring 24 is secured at the flared portion 23 of the tapered pipe 14 opening to prevent the rubber ring 22 from detaching from the tapered pipe 14. The flared portion 23 also facilitates water flow through it, preventing the water from blowing open the limiting ring 24. After the outer wall of the tapered pipe 14 and the inner wall of the water inlet 21 are abutted, the connecting ring 15 is bolted to the carrying case 1. The tapered pipe 14 and the rubber ring 22 seal the connection between the water outlet pipe 7 and the water inlet 21, preventing water leakage.

[0027] Slide the baffle 17 to partially block the opening of the water injection pipe 20, then tighten the pressure rod 18 so that the sealing plate 19 abuts against the opening of the water injection pipe 20. Adjusting the size of the opening of the water injection pipe 20 by using the baffle 17 allows for simulation of different intensities of rainfall, provided the flow rate of the metering pump 6 is fixed (i.e., the flow rate discharged through the water injection pipe 20 remains constant). Alternatively, adjusting the flow rate of the metering pump 6 while keeping the opening size of the water injection pipe 20 constant can also simulate different intensities of rainfall. Multiple comparative experiments can be conducted using these two simulation methods.

[0028] After a certain amount of water is drained from the water storage tank 2, the upper support rod 10 is adjusted to slide upwards. The upper support rod 10 drives the inlet pipe 8 to slide upwards, causing the inlet pipe 8 to detach from the water surface in the water storage tank 2. The metering pump 6 continues to work to drain the remaining water in the inlet pipe 8 or the metering pump 6. Then, the inlet pipe 8 and the outlet pipe 7 are disassembled and reattached to the hook 13 via the hanging ring. At this time, the weight of the water storage tank 2 is measured by the first weighing module 3 and recorded as d3. The drainage volume a = d3 - d1. The total weight of the metering pump 6 and the mounting frame is measured by the second weighing module 4 and recorded as d4.

[0029] If the weight of metering pump 6 after calibration is less than its initial weight (d4 < d2), then the sum of the drainage volume a and the difference in weight d4 - d2 of metering pump 6 represents the amount of water entering the rain gauge, which is compared with the water volume displayed on the rain gauge. If the weight of metering pump 6 after calibration is greater than its initial weight (d4 > d2), then the difference between the drainage volume a and the difference in weight d2 - d4 of metering pump 6 represents the amount of water entering the rain gauge, which is compared with the water volume displayed on the rain gauge. If the weight of metering pump 6 after calibration is equal to its initial weight (d4 = d2), then the drainage volume a represents the amount of water entering the rain gauge, which is compared with the water volume displayed on the rain gauge. By weighing, calculating, and comparing the results, the accuracy of the water volume displayed on the rain gauge can be determined.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A weighing-type rain gauge calibrator, characterized in that: The device includes a portable case containing a first weighing module, a second weighing module, a water storage tank, and a metering pump. The water storage tank is placed on the first weighing module, and the metering pump is placed on the second weighing module. The portable case has a water inlet, and the water outlet of the metering pump is connected to a water outlet pipe. The water outlet pipe and the water inlet are detachably connected. An adjustment device for adjusting the size of the water inlet is installed on the outer wall of the portable case. The water inlet of the metering pump is connected to a water inlet pipe that extends into the water storage tank. A bracket for supporting the water inlet pipe is installed inside the portable case, and the water inlet pipe is detachably connected to the bracket.

2. The weighing-type rain gauge calibrator according to claim 1, characterized in that: The bracket includes an upper support rod and a lower support rod that slide vertically. The upper support rod is installed on the top of the portable case, and the lower support rod is installed on the bottom of the portable case. The lower end of the upper support rod and the upper end of the lower support rod are both fixed with mounting rings for the water inlet pipe to pass through. The mounting rings are provided with locking components for limiting the position of the water inlet pipe.

3. The weighing-type rain gauge calibrator according to claim 2, characterized in that: The locking element includes a locking rod that is slidably connected to the mounting ring along the mounting ring in the radial direction. A fixing block is fixed to the end of the locking rod located inside the mounting ring. A magnetic block is fixed on the fixing block. An electromagnet for attracting or repelling the magnetic block is fixed to the inner wall of the mounting ring.

4. The weighing-type rain gauge calibrator according to claim 3, characterized in that: The locking rod has a limit block fixed at its end located on the outside of the mounting ring, and a spring is fixed between the limit block and the inner wall of the mounting ring.

5. The weighing-type rain gauge calibrator according to claim 1, characterized in that: The adjusting component includes a baffle that is slidably connected to the outer wall of the carrying case, and the baffle is used to close the water inlet.

6. The weighing-type rain gauge calibrator according to claim 5, characterized in that: A pressure rod is threaded onto the baffle, and one end of the pressure rod extending through the baffle and fixed with a sealing plate.

7. The weighing-type rain gauge calibrator according to claim 1, characterized in that: The end of the water outlet pipe is equipped with a seal, which is used to seal the connection between the water outlet pipe and the water inlet.

8. The weighing-type rain gauge calibrator according to claim 7, characterized in that: The sealing element includes a tapered tube fixed to the end of the water outlet pipe. The small-diameter end of the tapered tube is a free end, and the outer diameter of the small-diameter end of the tapered tube is smaller than the inner diameter of the water inlet. The outer diameter of the large-diameter end of the tapered tube is larger than the inner diameter of the water inlet.

9. The weighing-type rain gauge calibrator according to claim 8, characterized in that: The sealing element includes a rubber ring fixed to the inner wall of the water inlet, the inner diameter of which is smaller than the outer diameter of the small diameter end of the tapered pipe.

10. The weighing-type rain gauge calibrator according to claim 9, characterized in that: The inner wall of the small-diameter end of the tapered tube is provided with a flared part, and a limiting ring for fitting against the flared part is fixed on the inner wall of the rubber ring.

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