| Zibo Bangyude Water Supply Equipment Co., Ltd. Tel: 0533-5760123 |
Company Fax: 0533-5760123
Official Website: jiccquao.com
Phone: 13335210119 (Manager Meng)
18953368321 (Manager Sun)
Company Address: Kunlun Town, Zichuan District, Zibo City
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| Common negative pressure elimination method for fire fighting water supply equipment |
| 2016/8/4 14:52:47 |
| Fire-fighting water supply equipment will withstand a certain negative pressure after being used for a certain period of time or after a long period of use. Then this is a certain hazard to the equipment. So how can this phenomenon be eliminated? Let's find out from the following introduction together. |
1. Make-up air method If one or a set of suction valve is installed on the top of the closed water tank where the upper end of the water inlet (connecting network) is the outlet of the water (connecting pump), the pumping flow rate of the pump can be greater than the inlet flow rate of the pipe network. When the vacuum is generated, the suction valve is opened to suck in the atmosphere, so that the closed water tank becomes an open container under atmospheric pressure. Therefore, the negative pressure is eliminated, and the flow rate of the pipe network is limited to the critical flow rate of the negative pressure pumping.
This commonly used suction and exhaust valve technology and device is obviously a mature and effective technology, so the "supply method" has become the method of eliminating negative pressure adopted by most products of fire water supply equipment.
2. Pre-pressurization method: Pre-pressurize a certain pressure in the air chamber of a rubber diaphragm pressure tank with water flowing in and out of the water, which can be achieved by applying pressure with an air compressor or a nitrogen bottle. Maintaining a certain pressure in the water inlet of the tap water limits the amount of water taken and does not cause negative pressure in the pipeline.
3. Buffer tank replenishment method When the pipe network capacity of the fire-fighting water supply equipment is sufficient, and the user's water pump is small, there is no condition for the generation of water shortage and negative pressure, that is, there will be no interruption of the flow of water that is greater than the flow of water. phenomenon.
At this time, the pump can be connected in series to the pipe network to directly pump water, but the negative pressure generated by the transient flow will still affect the safety of the pipe network. In many cases, the pump will start, stop the pump, oscillate, lose control, and the outlet pipe will break. Pressure.
In order to avoid the pulsation of the pipe network caused by this phenomenon, an air tank can be connected in parallel with the water inlet pipe of the pump. Potential energy of the pressure of the pipe network and the height of the water level in the tank is stored in the tank. , The air tank replenishes the flow to the pump port. Since the negative pressure in the supply tank of the air tank is controlled above the gasification pressure of the water body, the negative pressure is eliminated, the conditions for the separation and reconsolidation of the water column are destroyed, the water flow pulsation or the water hammer pressure rise is controlled, and the fire water supply is controlled. The safety and stability of equipment pipeline operation play an important role.
4. The intelligent control method uses advanced intelligent control equipment and technology to automatically control the working conditions of the pump and the flow state of the water body, and fundamentally eliminates the negative pressure generation conditions, and it will not generate negative pressure instead of eliminating it after generation.