A low-pressure water tongue projection distance observation device and analysis method

Abstract

The present invention relates to a low-pressure water tongue throw distance observation device and analysis method, belonging to the field of hydraulic test equipment, and includes an inlet and outlet pipe valve, a water pump, an underground reservoir, a decompression tank, an electric motor, a stilling basin, a scale, a scale track, a camera and a camera track; the air pressure in the decompression tank is controlled by adjusting the inlet and outlet pipe valve to reach the required pressure value; the height of the scale is adjusted through the scale track to meet a certain measurement range, and it is ensured that the 0 scale line of the scale is aligned with the outlet of the hydraulic jump; the position of the camera can be arbitrarily adjusted through the camera track to be approximately at the position where the throw distance needs to be measured. The present invention is easy to operate, solves the problem that it is inconvenient to observe due to the setting of channel steel, etc. in the traditional decompression tank, saves the test time, and greatly improves the measurement accuracy.

Description

Technical Field

[0001] The present invention relates to an observation device and analysis method for the projection distance of a water tongue under low pressure, belonging to the field of hydraulic experiments. Background Art

[0002] In current hydraulic experiments, the projection distance of the water tongue is generally measured by ordinary ranging methods, such as a tape measure, a laser rangefinder, etc. For the experiment of the projection distance of the water tongue under a low-pressure environment, a decompression chamber is needed to adjust the low pressure. However, the channel steel of the decompression chamber body causes the scale of the moving scale to be unable to be observed through the observation window in some areas, and the water tongue is not completely constant and there are always fluctuations, resulting in a large error in manual observation. Summary of the Invention

[0003] In view of the above defects, the present invention provides an observation device and analysis method for the projection distance of a water tongue under low pressure.

[0004] The specific solution is as follows: An observation device for the projection distance of a water tongue under low pressure includes an inlet pipe valve, an outlet pipe valve, a water pump, an underground reservoir, a decompression chamber, an electric motor, a stilling basin, a moving scale, a moving scale track, a camera and a camera track.

[0005] Further, the moving scale track is installed inside the decompression chamber and vertically fixed on the right side of the outlet of the stilling basin; the left end of the moving scale is fixed on the moving scale track with a pulley, and the height of the moving scale can be adjusted through the moving scale track for measuring the projection distance of the water tongue at different heights; the 0 scale line of the moving scale is aligned with the outlet of the jet flow for convenient subsequent reading.

[0006] Further, the camera track is installed inside the decompression chamber and horizontally fixed on the left side of the stilling basin; the electric motor is installed at the right end of the camera track; the camera is placed on the camera track through a pulley and can horizontally move the required distance under the action of the electric motor; looking along the direction of the jet flow, the moving scale should be placed on the right side of the jet flow and the camera should be placed on its left side.

[0007] Further, the moving scale is red with black characters.

[0008] In addition, the present invention provides a method for measuring and analyzing using the above-mentioned device, including the following steps:

[0009] Step 1: First, adjust the height of the moving scale to the required measurement height, then move the camera to the end position of the projection distance, keep the camera moving slowly along the direction of the jet flow, and use it to record the jet flow for no less than 3 minutes.

[0010] Step 2: Export the images, requiring one image to be exported every 1 second.

[0011] Step 3: Analyze the image. The color of the image will change through three stages. First, it is the red color of the normal moving scale. Then, it becomes an unclear color under the influence of the jet flow. Finally, it returns to the red color of the normal moving scale. Record the position where the unclear color first appears in the image, and read the scale of the moving scale at this position. This reading is regarded as the inner edge of the jet distance of the jet flow at this height. When the red color of the normal moving scale appears again in the image, the corresponding scale reading is the outer edge of the jet distance of the jet flow at this height.

[0012] The present invention has the following advantages compared with the prior art:

[0013] (1) It can observe the jet distance of the low-pressure water tongue in the decompression tank. By installing a movable camera in the decompression tank, the present invention solves the problem of inconvenient observation.

[0014] (2) The measurement result has high accuracy. By taking the average value of the long-term measurement results, the present invention greatly reduces the errors caused by human factors and fluctuation factors, and improves the observation accuracy. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the measuring device of the present invention.

[0016] Figure 2 is a partial schematic diagram of the positions of the moving scale and the camera.

[0017] 1 Inlet pipe valve; 2 Outlet pipe valve; 3 Water pump; 4 Underground reservoir; 5 Decompression tank; 6 Electric motor; 7 Cipolletti weir; 8 Moving scale; 9 Moving scale track; 10 Camera; 11 Jet flow; 12 Camera track; Detailed Embodiment Embodiment

[0018] An observation device and analysis method for the jet distance of a low-pressure water tongue. The schematic diagram of the measuring device is shown in Figure 1 , where 1 is the inlet pipe valve, 2 is the outlet pipe valve, 3 is the water pump, 4 is the underground reservoir, 5 is the decompression tank, 6 is the electric motor, 7 is the cipolletti weir, 8 is the moving scale, 9 is the moving scale track, 10 is the camera, 11 is the jet flow, 12 is the camera track; Control the air pressure in the decompression tank 5 by adjusting the inlet pipe valve 1 and the outlet pipe valve 2 to make it reach the required pressure value. Then, adjust the height of the moving scale 8 through the moving scale track 9 to make it meet a certain measurement range, and ensure that the 0 scale line of the moving scale 8 is aligned with the outlet of the jet flow 11. After that, adjust the position of the camera 10 through the camera track 12 to make it in the approximate position where the jet distance needs to be measured. Looking along the direction of the jet flow 11, the moving scale 8 should be placed on the right side of the water flow, and the camera 10 should be placed on its left side.

[0019] The measurement process of this embodiment is as follows: Step 1, starting from the approximate position where the skip distance needs to be measured, keep the camera moving slowly along the direction of the ejected water flow and record the ejected water flow with it for no less than 3 minutes; Step 2, export the images, exporting one image every 1 second; Step 3, analyze the images. The color of the images will change through three stages. First, it is the red color of the normal moving scale, then to the unclear color under the influence of the water flow, and finally back to the red color of the normal moving scale. Record the position where the unclear color first appears in the image and read the scale of the moving scale at this position. This reading is regarded as the inner edge of the skip distance of the ejected water flow at this height. When the red color of the normal moving scale appears again in the image, the corresponding scale reading is the outer edge of the skip distance of the ejected water flow at this height. The present invention solves the problem of inconvenient observation of the original device by providing an observable device for the skip distance of the low-pressure water tongue; by taking the average value of the long-term measurement results, the error caused by human factors and fluctuation factors is greatly reduced.

[0020] The present invention is not limited to the above embodiments, and several equivalent transformations and substitutions can also be made to it, and these equivalent transformations and substitutions should also be regarded as belonging to the protection scope of the present invention.

Claims

1. A method of measurement and analysis, which uses a low-pressure water tongue throw distance observation device for measurement and analysis, is characterized in that, The described low-pressure water tongue projection distance observation device includes an inlet pipe valve (1), an outlet pipe valve (2), a water pump (3), an underground reservoir (4), a pressure reduction box (5), an electric motor (6), a stilling basin (7), a movable scale (8), a movable scale track (9), a camera (10), and a camera track (12); The described movable scale track (9) is installed inside the pressure reduction box (5) and is vertically fixed on the right side of the outlet of the stilling basin (7); the left end of the described movable scale (8) is fixed on the movable scale track (9) with a pulley; the 0 scale line of the described movable scale (8) is aligned with the outlet of the jet flow (11); The described camera track (12) is installed inside the pressure reduction box (5) and is horizontally fixed on the left side of the stilling basin (7); the described electric motor (6) is installed at the right end of the camera track (12); the described camera (10) is placed on the camera track (12) through a pulley and can move horizontally by the required distance under the action of the electric motor (6); looking along the direction of the jet flow (11), the described movable scale (8) should be placed on the right side of the jet flow (11), and the camera 10 is placed on its left side; The described movable scale (8) has a red background with black characters; The steps of the described measurement and analysis method are as follows: Step 1, first adjust the height of the movable scale (8) to the required measurement height, then move the camera (10) to the end position of the projection distance, keep the camera (10) moving slowly along the direction of the jet flow (11), and use it to record the jet flow (11). The recording time is not less than 3 minutes; Step 2, export the images, requiring one image to be exported every 1 second; Step 3, analyze the images. The color of the images will go through three stages of change. First, it is the red color of the normal movable scale (8), then to the unclear color under the influence of the jet flow (11), and finally back to the red color of the normal movable scale (8). Record the position where the unclear color first appears in the image, and read the scale of the movable scale (8) at this position. This scale reading is regarded as the inner edge of the projection distance of the jet flow (11) at this height. When the red color of the normal movable scale (8) appears again in the image, the corresponding scale reading is the outer edge of the projection distance of the jet flow (11) at this height.

Images