Centrifugal pumps that pump water automatically without filling the suction line with water are called self-priming pumps. More keyword search: Self-priming pump
Self-priming pump structure of many types, of which, outside the mixed self-priming pump works is: before starting the pump filled with water in the pump housing (or the pump itself has water). After the start of high-speed rotation of the impeller so that the impeller channel flow of water to the volute, then the entrance to form a vacuum, the inlet valve against the open, the suction pipe into the air within the pump and reach the outer edge of the impeller channel. On the other hand, the water drained by the impeller into the gas-water separation chamber flows back to the outer edge of the impeller through the left and right return holes. Left back to the water back to the water hole in the pressure difference and the role of gravity, fired into the impeller channel, and was crushed by the impeller, and inhaled air to the pipe after mixing thrown volute, vacuum pump liquid metering Pump gear pump corrosion pump acid pump fire pump to rotate the direction of flow. Then merge with the water from the right backwater hole and flow down the volute. As the liquid in the volute continuously impact cascades, constantly being crushed by the impeller, with strong air mixing, generating gas and water mixture, and continue to flow so that gas and water can not be separated. The mixture is peeled off the tongue at the volute outlet and enters the separation chamber along the stub tube. The air in the separation chamber is separated and drained by the outlet pipe, while the water is still flowing back and forth to the outer edge of the impeller through the return holes and mixed with the air in the suction pipe. So repeated cycles, and gradually sucked into the air exhaust pipe, the water into the pump to complete the process of self-absorption. Sewage pump self-priming pump oil pump diaphragm pump screw pump gear pump diaphragm self-priming pump mixed self-priming pump , working principle and external mixed self-priming pump the same, the difference is that the return water does not flow to the outer edge of the impeller, . Internal hybrid self-priming pump at start-up, to open the back of the impeller before the return valve, so that the liquid pump back to the impeller inlet. The water is mixed with the air from the suction pipe under the action of high speed rotation of the impeller to form a gas-water mixture to be discharged to the separation chamber. Here the air is drained and the water returns from the return valve to the impeller entrance. So repeated until the air exhausted, sucked in water.
Self-priming pump self-priming height, and the impeller seal before the gap, the number of pumps, separation chamber liquid level and other factors. The smaller impeller seal clearance, the greater the self-priming height, generally taken as 0.3 to 0.5 mm; in the gap increases, in addition to self-priming height drop, the pump head, the efficiency is reduced. Pump self-priming height with the impeller circumferential speed u2 increases, but to the maximum height of self-priming, the number of revolutions increased self-priming height will not increase, this time only shorten the self-priming time; when the number of revolutions As you descend, the level of self-priming drops. The self-priming height also increases with increasing reservoir height (but not beyond the optimal reservoir height of the separation chamber), with all other conditions remaining constant. In order to better self-priming pump gas and water mixing, the impeller blade to be less, so that the blade pitch increases; and should be used semi-open impeller (or impeller channel wider impeller), so that more Easy backwater depth into the impeller cascade. Pipeline pumps Pumps Chemical pumps Magnetic pumps Centrifugal pumps Self-priming pumps are mostly fitted with internal combustion engines and are mounted on a movable trolley, suitable for field work.
Explosion-proof self-priming pump self -priming pump works? Ordinary centrifugal pump, if the inhalation of liquid below the impeller, the start should be pre-irrigation, very inconvenient. In order to pump the water in the reservoir, the intake of the suction pipe needs to be fitted with a bottomed valve, which causes great hydraulic losses when the pump is in operation. The so-called self-priming pump, is not required before the start of irrigation (after the first start of the installation still need irrigation), after a short period of operation, by the pump itself, that is, the water can be sucked up, put into normal work. Self-priming pump according to the principle of action is divided into the following categories: 1. Gas-liquid hybrid (including the inside and outside mixed); 2. Water ring wheel; 3. Jet (including liquid jets and gas jets). Gas-liquid hybrid self-priming pump work process: Due to the special structure of the self-priming pump body, the pump stops, the pump body has a certain amount of water, the pump starts again after the impeller due to rotation, inhalation of air and water pipe Fully mixed, and was discharged to the gas-water separation chamber, the gas above the gas-water separation chamber overflows, the lower part of the water back to the impeller, and re-inhalation of the remaining air intake pipe until the pump and the suction pipe all the gas discharge, complete since Suction, and normal pumping. Water ring wheel self-priming pump is the water ring and pump impeller combination of a shell, with the water ring to the gas discharge, to achieve self-absorption. When the pump is working properly, the valve of the water ring and the pump impeller can be cut off by the valve, and the liquid in the water ring wheel can be released. Jet-type self-priming pump, the centrifugal pump and jet pump (or injector) combination of relying on the jet device, resulting in a vacuum nozzle to achieve suction.
Self-priming clear water pump; Industrial self-priming pump; ZX-type self-priming pump
Self-priming clear water pump Product Overview ZX-type self-priming centrifugal pump is the earliest according to the relevant technical information at home and abroad by absorption, digestion, improved energy-saving pump developed products. The pump is a self-priming centrifugal pump, and has other pump does not have the self-absorption capacity and so on. Such as the use of corrosion-resistant mechanical seals and stainless steel can play chemical, pharmaceutical acid-base medium.
Second, the product features
1, the pump has a self-priming function, the pipeline does not require the installation of the end valve, just before the work to ensure that the pump body has a fixed amount of fluid can have a drainage, life-long self-priming function. Therefore, not only simplifies the piping system, but also improves the working conditions.
2, with a compact, easy to operate, smooth operation, easy maintenance, high efficiency, long life.
Third, product use
â‘ industrial self-priming water pump for urban environmental protection, construction, fire fighting, chemical, pharmaceutical, dye, printing and dyeing, brewing, electricity, electroplating, paper making, oil, mining, equipment cooling, unloading oil tanker.
② industrial self-priming water pump for water, sea water and acid, alkalinity of the chemical medium liquid and paste with a general viscosity of the media slurry ≤ 100 PCT, with a solid content of up to 30%.
â‘¢ industrial self-priming clear water pump installed rocker-type nozzle, but also the water rushed into the air, dispersed into small raindrop spray, farm, nursery, orchards, tea plantations a good tool.
â‘£ and can be used with any type, size filter press supporting the use of the slurry sent to the filter press filter supporting the ideal matching pump.
Fourth, working conditions
Flow: 3 ~ 500m3 / h
Head: 10 ~ 80m
Ambient temperature ≤ 50 ℃
Medium temperature ≤100 ℃
Medium density ≤ 1.24 × 103kg / m3