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渣漿泵泵的安裝位置泵的幾何安裝高度
一、 泵的幾何安裝高度
泵的幾何安裝高度，對(duì)臥式泵是指泵軸中心線到液面的垂直高度。泵的幾何安裝高度的確定主要從下面兩方面來(lái)考慮確定的，一是受泵的汽蝕性能限制，即不能太高;另一方面是被淹沒(méi)的危險(xiǎn)，即不能太低。另外還要考慮施工要求及投資成本。
(1)汽蝕性能限制:可按第三章第四節(jié)式(3-11)或式(3-14)來(lái)計(jì)算確定，即:
(2)淹沒(méi)危險(xiǎn):在雨季水位上升，要防止泵和電機(jī)被淹沒(méi)的危險(xiǎn)。
二、泵離水源的距離
泵應(yīng)盡量靠近水源，可以減小進(jìn)水管路長(zhǎng)度和阻力損失，但為了使液體平穩(wěn)吸入泵內(nèi)，在泵吸入口前要求有3D以上的直管段，為了減小進(jìn)水管的長(zhǎng)度和彎頭，泵的進(jìn)水口應(yīng)朝向水源方向。
三、進(jìn)水池的要求
泵并不定都要進(jìn)水池，如小型泵、井泵。但對(duì)大型泵，為了使水流平穩(wěn)，便于檢修，常設(shè)有進(jìn)水池。進(jìn)水池設(shè)計(jì)的原則是:水流要平穩(wěn)均勻，流速不要太大，盡量避免產(chǎn)生旋渦。
1.進(jìn)水池尺寸
圖6- 1為進(jìn)水池的最小尺寸要求。
(1)進(jìn)水池最小深度h
h=h1+h2+C
式中h1---進(jìn)水管口離油底的距離，h1≥(07- 08)D.但是小不得小于0.3m:
H2—淹沒(méi)深度。 即進(jìn)水管口至水面的距高，h≥(1.5.20)，最小不得小于0. 5m,水面應(yīng)以旱季最低動(dòng)水位的水面來(lái)確定:
C--水面至池 面的距離，注意此時(shí)水面應(yīng)以雨季最高動(dòng)水位確定，一般取 0.3~0.5m。
(2)進(jìn)水池的寬度B
進(jìn)水池的寬度要考慮進(jìn)水管與壁面的距離，最小應(yīng)取(1.25 ~ 1.5)D，所以進(jìn)水池的寬度B≥3D,泵應(yīng)布置在中間。若是多臺(tái)泵布置，為防止相互干擾、奪水，兩臺(tái)泵之間要有一定的距離，最小應(yīng)取(2.5 ~ 3.0)D,有時(shí)，因考慮泵檢修的需要，還可能要大一些。
對(duì)于無(wú)進(jìn)水池，可參照上述要求來(lái)布置泵。
如果因進(jìn)水池設(shè)計(jì)不當(dāng)。減由于系的口格增大后發(fā)生了旋渦，可按圖6-2的幾種防止旋渦發(fā)生的方法來(lái)改善補(bǔ)救。
圖6-2(a)是進(jìn)水他進(jìn)口處，離進(jìn)水管1D處，插入一個(gè)旋渦防止板。
圖6-2(b)是在進(jìn)水管后壁水中水平加旋渦防止板。
圖6-2(c)是在進(jìn)水管的四周水面加一個(gè)蓋，流在水面上可隨水面升高成降低浮動(dòng)。
圖6-2(d)是在進(jìn)水管兩側(cè)加旋渦防止板。
以上這幾種方法是作為當(dāng)發(fā)生旋渦后的一些補(bǔ)救方法， 能起到一定的作用。
2.進(jìn)水池的布置
進(jìn)水池雖然符合尺寸要求，但由于布置不當(dāng)也會(huì)產(chǎn)生旋渦或干擾、兩泵間奪水等現(xiàn)象，影響泵的正常運(yùn)轉(zhuǎn)，尤其對(duì)大口徑泵，正確的布置更為重要。
圖6-3表示了幾種布置形式的好例與壞例，供參考。
3.攔污護(hù)網(wǎng)
若油送的液面很臟時(shí)，單靠進(jìn)水管的護(hù)網(wǎng)是不夠的，常常會(huì)有把進(jìn)口護(hù)網(wǎng)堵塞或部分堵塞的危險(xiǎn)，造成泵流量減少，更嚴(yán)重的會(huì)造成泵的汽蝕。此時(shí)，需在進(jìn)水池進(jìn)口，或在進(jìn)水
管四周加攔污護(hù)網(wǎng)，護(hù)網(wǎng)應(yīng)傾斜45°~60°。對(duì)于水中泥沙較多的情況下，應(yīng)設(shè)沉淀池，以減小對(duì)泵過(guò)留不久的磨損。
泵房
泵一般都需要設(shè)置泵房，以防止雨水風(fēng)沙侵蝕。對(duì)于臥式泵可將進(jìn)水池布置在泵房外面，對(duì)于立式泵可布置在進(jìn)水池或水井上面。
泵房應(yīng)有足夠大的面積，泵與墻壁、泵與泵之間要有一定的距離，便于維修時(shí)操作。
泵房應(yīng)有足夠的高度，便于安裝時(shí)的起吊。如果泵房的高度不夠時(shí)?？?/span>以在泵房頂開(kāi)天窗來(lái)解決，對(duì)大型泵的泵房應(yīng)設(shè)置起吊設(shè)備。
泵房離變壓器不能太遠(yuǎn)，以防止線壓降太大。 渣漿泵
Installation position of slurry pump geometric installation height of pump
I. geometric installation height of pump
The geometric installation height of the pump refers to the vertical height from the center line of the pump shaft to the liquid level. The geometric installation height of the pump is mainly determined from the following two aspects: one is limited by the cavitation performance of the pump, that is, it cannot be too high; the other is the risk of being submerged, that is, it cannot be too low. In addition, construction requirements and investment cost shall be considered.
(1) cavitation performance limit: it can be calculated and determined according to formula (3-11) or formula (3-14) in Section IV of Chapter III, namely:
(2) inundation hazard: when the water level rises in rainy season, the danger of pump and motor being inundated shall be prevented.
II. Distance between pump and water source
The pump shall be close to the water source as far as possible, which can reduce the length and resistance loss of the water inlet pipeline. However, in order to make the liquid smoothly inhaled into the pump, there shall be more than 3D straight pipe section in front of the pump suction port. In order to reduce the length and elbow of the water inlet pipe, the water inlet of the pump shall face the water source direction.
III. requirements for water inlet tank
Pumps do not always have to enter the pool, such as small pumps, well pumps. But for large pumps, in order to make the water flow stable and convenient for maintenance, there is always a water inlet tank. The design principle of the water inlet tank is: the water flow shall be stable and uniform, the flow velocity shall not be too large, and vortex shall be avoided as far as possible.
1. Size of water inlet tank
Figure 6-1 shows the minimum size requirements for the intake basin.
(1) minimum depth of water inlet tank H
H=h1+h2+C
In the formula, H1 is the distance between the inlet pipe and the oil bottom, H1 ≥ (07-08) d. but the smaller one shall not be less than 0.3m
H2 - submergence depth. That is, the distance from the water inlet to the water surface, H ≥ (1.5.20), shall not be less than 0.5m, and the water surface shall be determined by the water surface with the lowest dynamic water level in dry season:
C -- distance from water surface to pool surface. Note that the water surface shall be determined by the highest dynamic water level in rainy season, generally 0.3-0.5m.
(2) width of water inlet B
The width of the water inlet tank should consider the distance between the water inlet pipe and the wall, and the minimum should be (1.25 ~ 1.5) d. therefore, the width of the water inlet tank B ≥ 3D, and the pump should be arranged in the middle. If multiple pumps are arranged, in order to prevent mutual interference and water grabbing, there should be a certain distance between the two pumps, with a minimum of (2.5 ~ 3.0) d. sometimes, due to the need of pump maintenance, it may be larger.
If there is no water inlet, the pump can be arranged according to the above requirements.
If the water inlet tank is not designed properly. In addition, since the vortex occurs after the opening of the system increases, the remedy can be improved according to several methods to prevent the vortex in Fig. 6-2.
Fig. 6-2 (a) is the inlet of other water inlet, 1D from the water inlet pipe, insert a vortex prevention plate.
Fig. 6-2 (b) is a vortex prevention plate added horizontally in the back wall water of the water inlet pipe.
Fig. 6-2 (c) is to add a cover around the water surface of the water inlet pipe, and the flow on the water surface can be reduced and floated with the rise of the water surface.
Fig. 6-2 (d) is to add vortex prevention plate on both sides of the water inlet pipe.
The above methods can be used as some remedial methods when vortex occurs, which can play a certain role.
2. Arrangement of water inlet tank
Although the inlet tank meets the size requirements, due to improper arrangement, there will also be vortex or interference, water grabbing between the two pumps and other phenomena, which will affect the normal operation of the pump, especially for large-diameter pumps, the correct arrangement is more important.
Figure 6-3 shows good and bad examples of several layout forms for reference.
3. Trash screen
If the liquid level of the oil delivery is very dirty, it is not enough to rely on the protection net of the water inlet pipe alone. There is often a risk of blocking or partially blocking the inlet protection net, resulting in the reduction of pump flow and even more serious cavitation of the pump. At this time, it needs to be at the inlet of the water inlet pool or at the water inlet
The pipe shall be provided with trash screen around which the inclination shall be 45 ° ~ 60 °. When there is a lot of sediment in the water, a sedimentation tank should be set up to reduce the wear of the pump.
Pump house
Generally, the pump room is required to prevent the erosion of rainwater and sand. For horizontal pump, the water inlet can be arranged outside the pump room, and for vertical pump, it can be arranged above the water inlet or well.
The pump room shall have a large enough area, and there shall be a certain distance between the pump and the wall, between the pump and the pump, so as to facilitate the operation during maintenance.
The pump room shall be of sufficient height to facilitate lifting during installation. If the height of pump room is not enough. It can be solved by opening a skylight on the top of the pump house, and lifting equipment shall be set for the pump house of large pump.
The pump room should not be too far away from the transformer to prevent too much line voltage drop. Slurry pump
