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潛水渣漿泵電泵與臥式渣漿泵的優(yōu)勢(shì)
如圖2 - 19所示，潛水電泵也是用來(lái)把深井中的水提到地面上，只是把電機(jī)和泵連在一起放于井下 水中去了，直接由電機(jī)帶動(dòng)泵的葉輪旋轉(zhuǎn)。省去了泵座、揚(yáng)水管、中間傳動(dòng)軸、聯(lián)軸器等，大大簡(jiǎn)化了泵的結(jié)構(gòu)。但由于要把電機(jī)放入井下水中運(yùn)行，所以對(duì)電機(jī)繞組絕緣要采取特殊措施。目前，潛水電機(jī)大多采用濕式的。但當(dāng)電機(jī)一旦產(chǎn)生故障修理是比較困難的。
圖2-20所示是作業(yè)面潛水泵，它也是泵和電機(jī)置于水下工作，但不受井徑的限制需要細(xì)長(zhǎng)，并且置于水下很淺。這種泵的電機(jī)一般是干式的，有干式和充油式兩種。這種泵安裝方便，啟動(dòng)前也不需要灌水，使用極其方便。所以常在野外，移動(dòng)使用的工地中使用。它的流量、揚(yáng)程、功率一般都較小。
九、屏蔽泵
如圖2-21所示，屏蔽泵又稱無(wú)軸封泵；泵的葉輪和電機(jī)轉(zhuǎn)子連成一體，電機(jī)的轉(zhuǎn)子和定子用薄壁圓筒封閉起來(lái)，使電機(jī)繞組與被輸送的液體隔開，并裝在一個(gè)密封殼體內(nèi)，故不需要軸封，從根本上消除了被輸送液體的外漏。所以常用來(lái)輸送易燃易爆、有放射性、有毒或貴重的液體。
十、自吸泵
如圖2-22所示，自吸系有內(nèi)循環(huán)和外循環(huán)兩種利式。圖2-22為內(nèi)循環(huán)式的自吸泵，它們都帶有氣水分離室，泵體較大。泵在啟動(dòng)前先往系內(nèi)灌滿液體，啟動(dòng)后由于葉輪旋轉(zhuǎn)，在離心力的作用下液體被甩出流道到泵體中，此時(shí)，葉輪進(jìn)口處形成真空，吸入管路內(nèi)的空氣進(jìn)入泵進(jìn)口與水混合后，形成氣水混合物進(jìn)入葉輪內(nèi)。然后，在離心力的作用下又被甩到泵體內(nèi)，由于泵體較大，流速減慢，進(jìn)行氣水分離。氣體向上由液面逸出，液體在靜壓力作用下，從泵體下方的噴嘴射出，回流到泵進(jìn)口，又與吸入管內(nèi)的空氣混合，進(jìn)入葉輪內(nèi)。這樣周而復(fù)始，不斷將泵進(jìn)水管路內(nèi)的空氣排出，液面不斷上升，直至吸入管內(nèi)的空氣全部排凈，液體進(jìn)入葉輪，完成自吸過(guò)程，泵正常排液。
如圖2 23 所示 為外循環(huán)自吸泵， 它與內(nèi)循環(huán)式自吸泵不同的是液體回流不在葉輪進(jìn)口，而在葉輪出口處與空氣混合，再排出到泵體進(jìn)行氣水分離，氣體從液面逸出，液體又回流到葉輪出口外圓，進(jìn)行氣水混合，直到排盡進(jìn)口管路中的空氣。 渣漿泵廠家
Advantages of electric pump and horizontal slurry pump of submersible slurry pump
As shown in Figure 2-19, the submersible pump is also used to lift the water in the deep well to the ground, but only to connect the motor and the pump together and put them in the well water. The motor directly drives the impeller of the pump to rotate. The pump base, lifting pipe, intermediate transmission shaft and coupling are omitted, which greatly simplifies the structure of the pump. However, due to the need to put the motor into the well water for operation, special measures should be taken for the motor winding insulation. At present, most of the submersible motors are wet type. But it is difficult to repair the motor once it breaks down.
Figure 2-20 shows the submersible pump on the working surface, which is also the pump and motor working under water, but it needs to be long and thin without the limitation of well diameter, and it is very shallow under water. The motor of this kind of pump is generally dry type, including dry type and oil filled type. This kind of pump is easy to install, no need to fill water before starting, so it is very convenient to use. So it is often used in the field and mobile construction site. Its flow, head and power are generally small.
IX. shield pump
As shown in Figure 2-21, the shield pump is also known as the shaftless pump; the impeller of the pump and the rotor of the motor are integrated, and the rotor and stator of the motor are sealed with thin-walled cylinders, so that the motor winding is separated from the delivered liquid, and installed in a sealed shell, so no shaft seal is required, fundamentally eliminating the leakage of the delivered liquid. Therefore, it is often used to transport flammable, explosive, radioactive, toxic or valuable liquids.
X. self priming pump
As shown in Figure 2-22, the self-priming system has two advantages: internal circulation and external circulation. Figure 2-22 shows the self-priming pump of internal circulation type, both of which are equipped with gas-water separation chamber, and the pump body is large. Before starting the pump, fill the system with liquid first. After starting, due to the rotation of the impeller, the liquid is thrown out of the flow channel into the pump body under the action of centrifugal force. At this time, a vacuum is formed at the impeller inlet. After the air in the suction pipeline enters the pump inlet and mixes with water, the air-water mixture is formed and enters the impeller. Then, it is thrown into the pump body under the action of centrifugal force. Because the pump body is large, the flow rate slows down, and gas-water separation is carried out. The gas escapes from the liquid surface. Under the static pressure, the liquid shoots out from the nozzle under the pump body, flows back to the inlet of the pump, and mixes with the air in the suction pipe to enter the impeller. In this way, the air in the water inlet pipe of the pump is continuously discharged and the liquid level is continuously rising until the air in the suction pipe is completely discharged and the liquid enters the impeller to complete the self-priming process and the pump is discharged normally.
As shown in Figure 223, the external circulation self-priming pump is different from the internal circulation self-priming pump in that the liquid reflux is not at the impeller inlet, but is mixed with air at the impeller outlet, and then discharged to the pump body for air-water separation. The gas escapes from the liquid surface, and the liquid flows back to the outer circle of the impeller outlet for air-water mixing until the air in the inlet pipeline is exhausted Slurry pump manufacturer
