Anti-freezing and heat-insulating method of water meter box and device thereof
A technology for water meter boxes and water meters, which is applied to measuring devices, preventing damage to volumetric instruments, instruments, etc., can solve the problems of limited antifreeze effect of antifreeze water meter boxes, inability to actively obtain heat to maintain the temperature in the box, etc. The effect of the simple structure of the device
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Embodiment 1
[0037] Antifreeze insulation device for water meter box, such as figure 1 with figure 2 As shown, the water meter box 1 is composed of a glass fiber reinforced plastic shell 11 and an insulating inner layer 12, and the insulating inner layer 12 is composed of two kinds of foaming insulating materials, PU and PS. The outer diameter of the box is 750mm×600mm×250mm, and the inner diameter is 650mm×500mm×150mm.
[0038] In order to obtain the heat data released by the water meter box 1 per hour, the following experiment was adopted:
[0039] Place a pot of 5kg water in a plastic container in the empty water meter box 1, place the water meter box 1 at -23°C, and measure the water and the air in the box at three time points: 0 hour, 1 hour, and 2 hours. The water temperature is 7.12°C, 5.45°C, and 3.76°C; the air temperature in the box is -3.0°C, -4.3°C, and -5.61°C. Take the average value of water temperature and air temperature drop every hour, then Δt 水 = 1.68, Δt 空 = 1.3. ...
Embodiment 2
[0065] The device in this implementation is exactly the same as that in Example 1, and it is subjected to an environmental test at -35°C.
[0066] Also use 5kg of water for the experiment, place a plastic container to hold water in the empty water meter box 1, place the water meter box 1 in an environment of -35°C, and measure the water temperature at three time points of 0 hour, 1 hour, and 2 hours. 7.25°C, 5.21°C, and 3.13°C respectively, then Δt per hour 水 = 2.06. Since the heat energy of the air in the water meter box 1 is basically neglected, the air temperature is not tested.
[0067] Q 箱 / 时 =Q 水放 =m 水 c 水 Δt 水 =5×4.2×10 3 ×2.06≈4.33×10 4 J
[0068] Q 箱 =4.33×10 4 ×8≈3.46×10 5 J
[0069] In this example,
[0070] Q 水 =m 水 c 水 Δt 水 =13×4.2×10 3 ×8≈4.37×10 5 J
[0071] Q 水 >Q 箱 , Q 水 / Q 箱 / 时 =4.37×10 5 / 4.33×10 4 ≈10.1 hours
[0072] Therefore, this embodiment can fully make up for the heat energy lost by the water meter box 1 in the environment o...
Embodiment 3
[0074] This implementation is structured as Image 6 As shown, part of the storage container 2 is embedded in the wall 8, and when heating indoors in the cold season in the north, the basic temperature of the wall 8 is maintained at 12-15°C, and when water is introduced into the storage container 2, it can basically be kept at 7°C above. Therefore, the hydrothermal energy of the storage container 2 is higher than that of Embodiment 1 or 2, so it can be kept warm for a longer period of time. Moreover, since the wall 8 is heated by the room, it continuously provides thermal energy to the storage container 2. Therefore, when the water in the storage container 2 is not replaced all the time, that is, the time when all water meters are not working is longer, there is enough thermal energy to maintain the water meters. The heat energy lost by box 1.
[0075] Therefore, this embodiment can completely make up for the heat energy lost by the water meter box 1 in the environment of -2...
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