- 地址：
- 安國(guó)市南陽(yáng)工業(yè)區(qū)
- 郵箱：
- 415130881@qq.com
- 電話(huà)：
- 18631165157
- 傳真：
- 0312-3427286
- 手機(jī)：
- 18631165157
渣漿泵的軸向力和徑向力
電動(dòng)機(jī)承受系軸向力及其機(jī)組質(zhì)量一種是在電 動(dòng)機(jī)端調(diào)整泵葉輪中心(見(jiàn)圖557)，由電動(dòng)機(jī)承受泵的軸向力及泵轉(zhuǎn)子質(zhì)量，常用于深井泵，在小型凝結(jié)水泵也有使用。目前，使用此結(jié)構(gòu)的電動(dòng)機(jī)最大功率達(dá)200kW左右。另一種是在泵聯(lián)軸器上調(diào)整泵葉輪中心，電動(dòng)機(jī)承受泵的軸向力及泵轉(zhuǎn)子質(zhì)量，目前已在使用的機(jī)組的最大軸向力達(dá)幾百千牛。
(2)泵承受軸向力此時(shí)泵本身帶推 力軸承，為了減少泵的軸向推力，有以下幾種措施:
1)葉輪加平衡孔，如圖5-47 所示，一般適用于 低揚(yáng)程泵。
2)加平衡鼓，如圖5.50和圖5-51所示，一般適用于高揚(yáng)程系。
剩余軸向力和轉(zhuǎn)子質(zhì)量由泵本身推力軸承承受。
(3)立式泵徑向力
1)導(dǎo)葉(流)式泵。其有若干個(gè)導(dǎo)葉或扭曲式(空間)導(dǎo)葉(見(jiàn)圖5-44、圖5-47-圖5-51)，故徑向力自動(dòng)平衡。
2)蝸殼式泵。當(dāng)吐出口徑大于80mm時(shí)，吐出渦室可設(shè)計(jì)成雙渦室，故徑向力自動(dòng)平衡。
3) 殘余徑向力及泵轉(zhuǎn)子擺動(dòng)由導(dǎo)軸承承受，轉(zhuǎn)子越長(zhǎng)，導(dǎo)軸承個(gè)數(shù)越多。
5. 立式泵其他問(wèn)題
1) 吸入筒體和密封室應(yīng)設(shè)放氣閥。
2)吸入段應(yīng)呈喇叭狀，當(dāng)設(shè)置吸人過(guò)濾網(wǎng)時(shí)，其有效截面應(yīng)為吸入口過(guò)流面積4~6倍，吸入喇叭管口徑大于吸入公稱(chēng)通徑1.3~1.5倍，甚至更多。
3)泵聯(lián)軸器與軸配合以間隙配合為好，便于裝拆，但其輪轂相對(duì)鍵上應(yīng)加頂絲。
4)泵的吐出壓力應(yīng)為用戶(hù)管網(wǎng)進(jìn)口接頭處的壓力，泵葉輪處與泵吐出口處壓力的差值由泵制造廠來(lái)考慮。
5) 立式泵轉(zhuǎn)子部件必須設(shè)計(jì)成可以軸向調(diào)整，以調(diào)整葉輪對(duì)中。
6) 如果輸送不清潔或無(wú)潤(rùn)滑性介質(zhì)(并非千摩擦)或有顆?；蛴幸?guī)定時(shí)，必須要加經(jīng)硬化處理的軸套，同時(shí)還要加護(hù)軸管，且護(hù)軸管內(nèi)要通有壓、干凈液體來(lái)潤(rùn)滑。
7)使用半開(kāi)式葉輪的泵，其殼體相對(duì)應(yīng)處要加可更換的耐磨板。8)立式泵本身沒(méi)有推力軸承時(shí)，其系聯(lián)軸器應(yīng)為剛性聯(lián)軸器。
Axial force and radial force of vertical slurry pump
The motor bears the axial force and the unit mass. One way is to adjust the center of the pump impeller at the motor end (see Figure 557). The motor bears the axial force of the pump and the mass of the pump rotor. It is commonly used in deep well pumps and also used in small condensate pumps. At present, the maximum power of the motor with this structure is about 200kW. The other is to adjust the center of the pump impeller on the pump coupling. The motor bears the axial force of the pump and the mass of the pump rotor. At present, the maximum axial force of the unit in use is hundreds of kilonewtons.
(2) When the pump bears axial force, the pump itself is equipped with thrust bearing. In order to reduce the axial thrust of the pump, the following measures are taken:
1) The impeller is equipped with a balance hole, as shown in Figure 5-47, which is generally applicable to low lift pumps.
2) Balance drum is added, as shown in Fig. 5.50 and Fig. 5-51, which is generally applicable to high lift system.
The residual axial force and rotor mass are borne by the thrust bearing of the pump itself.
(3) Radial force of vertical pump
1) Guide vane (flow) pump. It has several guide vanes or twisted (spatial) guide vanes (see Fig. 5-44, Fig. 5-47 - Fig. 5-51), so the radial force is automatically balanced.
2) Volute pump. When the outlet diameter is greater than 80mm, the outlet vortex chamber can be designed as a double vortex chamber, so the radial force is automatically balanced.
3) The residual radial force and the swing of the pump rotor are borne by the guide bearing. The longer the rotor, the more guide bearings.
5. Other problems of vertical pump
1) The suction cylinder and sealing chamber shall be equipped with air release valve.
2) The suction section shall be trumpet shaped. When the suction filter screen is set, its effective section shall be 4~6 times the overflow area of the suction inlet. The diameter of the suction trumpet pipe is 1.3~1.5 times larger than the nominal suction diameter, or even more.
3) It is better to fit the pump coupling and shaft with clearance for easy assembly and disassembly, but the relative key of the hub shall be provided with jackscrews.
4) The discharge pressure of the pump shall be the pressure at the inlet joint of the user's pipe network, and the difference between the pressure at the pump impeller and the pump discharge outlet shall be considered by the pump manufacturer.
5) Vertical pump rotor components must be designed to be able to be adjusted axially to adjust impeller alignment.
6) If unclean or non lubricating medium (not friction) or particles or regulations are delivered, hardened shaft sleeves must be added and shaft protectors must be added, and the shaft protectors must be lubricated with pressure and clean liquid.
7) For pumps with semi open impeller, replaceable wear plate shall be added at the corresponding position of the casing. 8) When the vertical pump itself has no thrust bearing, its coupling shall be rigid coupling.
