渣浆泵泵的安装位置泵的几何安装高度

一、 泵的几何安装高度

泵的几何安装高度，对卧式泵是指泵轴中心线到液面的垂直高度。泵的几何安装高度的确定主要从下面两方面来考虑确定的，一是受泵的汽蚀性能限制，即不能太高;另一方面是被淹没的危险，即不能太低。另外还要考虑施工要求及投资成本。
    (1)汽蚀性能限制:可按第三章第四节式(3-11)或式(3-14)来计算确定，即:

(2)淹没危险:在雨季水位上升，要防止泵和电机被淹没的危险。

二、泵离水源的距离

泵应尽量靠近水源，可以减小进水管路长度和阻力损失，但为了使液体平稳吸入泵内，在泵吸入口前要求有3D以上的直管段，为了减小进水管的长度和弯头，泵的进水口应朝向水源方向。
三、进水池的要求
    泵并不定都要进水池，如小型泵、井泵。但对大型泵，为了使水流平稳，便于检修，常设有进水池。进水池设计的原则是:水流要平稳均匀，流速不要太大，尽量避免产生旋涡。
1.进水池尺寸

图6- 1为进水池的最小尺寸要求。

(1)进水池最小深度h
      h=h1+h2+C

式中h1---进水管口离油底的距离，h1≥(07- 08)D.但是小不得小于0.3m:

H2—淹没深度。 即进水管口至水面的距高，h≥(1.5.20)，最小不得小于0. 5m,水面应以旱季最低动水位的水面来确定:
     C--水面至池 面的距离，注意此时水面应以雨季最高动水位确定，一般取 0.3~0.5m。

(2)进水池的宽度B

进水池的宽度要考虑进水管与壁面的距离，最小应取(1.25 ~ 1.5)D，所以进水池的宽度B≥3D,泵应布置在中间。若是多台泵布置，为防止相互干扰、夺水，两台泵之间要有一定的距离，最小应取(2.5 ~ 3.0)D,有时，因考虑泵检修的需要，还可能要大一些。
    对于无进水池，可参照上述要求来布置泵。
    如果因进水池设计不当。减由于系的口格增大后发生了旋涡，可按图6-2的几种防止旋涡发生的方法来改善补救。

图6-2(a)是进水他进口处，离进水管1D处，插入一个旋涡防止板。

图6-2(b)是在进水管后壁水中水平加旋涡防止板。

图6-2(c)是在进水管的四周水面加一个盖，流在水面上可随水面升高成降低浮动。

图6-2(d)是在进水管两侧加旋涡防止板。

以上这几种方法是作为当发生旋涡后的一些补救方法， 能起到一定的作用。

2.进水池的布置

进水池虽然符合尺寸要求，但由于布置不当也会产生旋涡或干扰、两泵间夺水等现象，影响泵的正常运转，尤其对大口径泵，正确的布置更为重要。

图6-3表示了几种布置形式的好例与坏例，供参考。

3.拦污护网

若油送的液面很脏时，单靠进水管的护网是不够的，常常会有把进口护网堵塞或部分堵塞的危险，造成泵流量减少，更严重的会造成泵的汽蚀。此时，需在进水池进口，或在进水

管四周加拦污护网，护网应倾斜45°~60°。对于水中泥沙较多的情况下，应设沉淀池，以减小对泵过留不久的磨损。

泵房

泵一般都需要设置泵房，以防止雨水风沙侵蚀。对于卧式泵可将进水池布置在泵房外面，对于立式泵可布置在进水池或水井上面。

泵房应有足够大的面积，泵与墙壁、泵与泵之间要有一定的距离，便于维修时操作。

泵房应有足够的高度，便于安装时的起吊。如果泵房的高度不够时。可以在泵房顶开天窗来解决，对大型泵的泵房应设置起吊设备。

泵房离变压器不能太远，以防止线压降太大。 渣浆泵

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