Self suction pump suction pipe requirements and design requirements

Self pump is a self-priming centrifugal pump, its working principle is to pump water through the impeller high-speed rotation of the impeller channel of water flow to the volute, then the formation of a vacuum inlet, the reverse influx The door is opened and the air in the suction pipe enters the pump and reaches the outer rim through the impeller channel. Water pipes play an important role in this process. Therefore, the self-priming pump pipe and its design requirements will be relatively more stringent, as follows: Self-priming pump suction pipe requirements and design requirements Self-priming pump suction pipe requirements (1) First of all should not leak. If the suction pipe leaks will not be able to absorb water or the amount of water will be reduced, if it is a fixed installation of self-priming pump should be used to prevent air leakage. Interface can be welded, buried in the soil should be coated with asphalt as a coating. (2) And then should not accumulate gas. The suction pipe will form a gas accumulation of gas, the impact of water capacity, severe damage to vacuum water absorption. To timely exhaust to prevent the accumulation of gas to form airbags. The suction pipe should have a gradient of the slope rising continuously in the direction of the water flow, rather than directly vertical upward, generally greater than 0.005, so that the highest point along the suction pipe should be at the top of the suction port of the pump. The section of the suction pipe is generally larger than the section of the suction port of the pump (to reduce the head loss), and the adjustable pipe on the water suction pipe should adopt the eccentric reduction pipe. (3) There is also the air can not be drawn into the suction pipe. As the water depth of the sink is not enough, self-priming suction pipe suction pipe depth is not enough, the inlet water flow generated vortex. Breathe with plenty of air. Destroy self-priming pump to absorb water normally. Suction ports should be guaranteed to have adequate submergence at the lowest water level. That is 0.5 ~ lm, if the depth can not meet the level of the end plate in the pipe. Second, the suction pump suction pipe design requirements (1) self-priming pump suction pipe as short as possible to reduce the loss along the way. (2) In order to prevent inhalation pool bottom sediment. The inlet of the suction pipe is not less than 0.8D above the bottom of the tank. D is the diameter of the enlarged part of the suction pipe of the suction pipe, usually 1.3 to 1.5 times the diameter of the suction pipe. (3) The edge of the bellows mouth is not less than (0.75 ~ 1) D from the wall. (4) When several suction pipes are installed in the same pool, the distance between the bellows shall not be less than 1.5-2. (5) In order to reduce the water head inlet head loss. Suction pipe inlet usually made of trumpet form, such as water when there is a large impurity. Need to set the filter outside the bell. (6) When the pump is started from the pressurized water pipe. Suction pipe should be equipped with a bottom valve (water can only enter the pump from the suction pipe, but can not flow out of it). (7) suction pipe design flow rate: when the diameter is small 250mm. Design flow rate of 1 ~ 1.2m / s; diameter less than 250mm, the design flow rate of 1.2 ~ 1.6m / s, the pipeline is short and the terrain water absorption height is not large, no flow rate of 1. 6 ~ 2.0m / s above is the self-priming pump pipe and its design of the basic requirements, I hope your understanding of the help. This article is copyrighted industry interconnect (Xiamen) Co., Ltd. All are welcome to reprint, please indicate the source and author of: Asian pumps Network Editor: Zeng Fenfen (QQ / micro letter: 2355962927) starting: http: // / (Service Hotline: 400-6030-811)

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