by This paper introduces the principle and structure of special components in automatic sprinkler system! 1.
As the ambient temperature of the dry-type sagging nozzle is generally less than 4 ℃ or higher than 70 ℃, if the system adopts the ordinary sagging nozzle, some water will remain at the short pipe of the unbroken nozzle and cannot be discharged smoothly from the system.
The existence of this part of water will have the risk of freezing.
At this time, ordinary vertical sprinkler or dry drooping sprinkler can be considered.
If it is a ceiling place, dry drooping sprinkler needs to be selected.
Often, The dry drooping nozzle consists of a section of sealed short pipe (optional length) and nozzle.
The inlet of the short pipe is sealed by a pipe plug with sealing gasket, and the glass bubble seals the inlet through the transmission pipe and pipe plug to prevent water from entering.
In case of fire, the closed nozzle detects the fire, the glass bubble is heated and burst, the compression spring in the short pipe pushes the transmission pipe, opens the pipe plug, the water flows into the short pipe, and sprays water through the nozzle.
This structure is convenient The utility model can prevent water from entering the nozzle without blasting, and solves the problem of water storage of the sagging nozzle.
2.
Automatic exhaust valve because there is usually a certain amount of air dissolved in the water, and the solubility of air decreases with the increase of temperature, so the gas in the water is gradually separated from the water and gathered together to form large bubbles or even gas columns.
At this time, in order to ensure that the pipeline is filled with water at any time, it is necessary to continuously discharge the gas separated from the pipeline, An automatic exhaust valve is used.
Automatic exhaust valves are generally used in wet systems.
When there is gas overflow in the system, the gas will climb up along the pipeline and finally gather at the highest point of the system, while the automatic exhaust valve is generally installed at the highest point of the system.
When the gas enters the valve chamber of the automatic exhaust valve and gathers at the upper part of the exhaust valve, the pressure rises with the increase of gas in the valve.
When the gas pressure is greater than the system pressure, the gas will lower the water surface in the chamber, The pontoon drops with the water level and opens the exhaust port; After the gas is exhausted, the water level rises, and the pontoon also rises.
Close the exhaust port.
Similarly, when negative pressure is generated in the system, the water surface in the valve chamber drops and the exhaust port opens.
At this time, the external atmospheric pressure is greater than the system pressure, so the atmosphere will enter the system through the exhaust port to prevent the harm of negative pressure.
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