立式渣浆泵刚性联轴器的分类
1.立式泵刚性联轴器
立式泵刚性联轴器如图5-53所示。此处系泵和电动机连接用的联轴器。泵本身带推力轴承时，泵联轴器可为挠性联轴器，如同卧式泵用的联轴器一样。当泵的轴向力及泵本体质量为电动机承受时，必须具备以下四项功能:其联轴器一定是刚性的，并承受泵的轴向力及其质量，同时它还要能进行泵转子对中的调整，且还要保证两轴的同心及传递扭矩。如果电动机端可调整泵中心，则此时联轴器只有两项功能。泵联轴器可以加长，如图5-53c所示，或不加长，如图5-53a↓b、d、e所示。如果泵装的是机械密封，则泵联轴器应是加长的，便于更换机械密封。下面推荐的几种刚性联轴器形式，供参考。

1) 图5-53a 型结构:其连接螺钉应为销和钉合一，调整垫为调整泵叶轮对中用。电动机和泵轴头螺母为固定各自的轴用，调整垫般是整块的，分半也可。
2)图5-53b型结构:其连接螺钉也为销和钉合一，调整块与泵轴头螺母合二为一一，可调整泵转子叶轮对中问题，最后用连接螺栓把紧。
上述1)和2)的调整块上的连接孔要大些，不起配合作用。
3) 图5-53d型结构:电动机轴为卡环定位，泵轴调整到一定位置后，用圆柱销穿过哈夫联轴器定位之。
4)图5-53e 型结构:电动机为卡环定位，与3)相同，而泵轴用调整块厚薄来调整泵叶轮的对中，最后用轴头螺钉拧紧，也是哈夫联轴器定位。
5)立式泵的联轴器也有要求在电动机座(支架)视窗上加护罩的。

2.轴联轴器
轴联轴器如图5-56所示。此处是指泵轴与泵轴连接用的连轴部件。它也一定是刚性的，并承受泵的轴向力及其质量，且能保证两轴同轴，还能传递转矩，其三项功能必备。
下面推荐几种联轴器形式供参考:
1) 图5-56a所示形式为螺纹连接，传动靠转速旋向使螺纹越拧越紧，结构简单，螺纹后面也有一段与轴配合定位。一般小泵用之。
2)图5-56b所示形式为卡套连接，泵行业用得比较多，上下轴用分半卡套连接，其外径用轴套限位。

3) 所示形式为两轴头用螺柱连接，或一轴端带螺纹连接，如图5-56f所示，外面加轴套用键传递转矩，而轴套定位用顶丝将其固定在键上。
4)图5-56g所示形式上下轴用分半卡环中间加轴套，且中间轴套上下用螺母拧紧定位，键传递转矩。
5)图5-56h所示形式类似图5-56b所示结构，两轴也是卡套连接，其外面为哈夫联轴器。

这里的泵联轴器和轴联轴器是两个不同的概念，前者有刚性和挠性之分，还有加长和不加长的区别，而后者必定是刚性的，没有加长之说。
3.电动机端调整泵叶轮中心
电动机端调整泵叶轮中心如图5-57所示。深井泵及小型凝结水泵可以在电动机端调整泵叶轮中心，这时不用泵联轴器，仅 用轴联轴器即可。电动机转子是空心的，电动机轴穿过空心通过支撑块(也叫电动机联轴器)，用调整螺母进行轴向调整，最后用紧固螺钉把紧。

Classification of rigid couplings for vertical slurry pumps

1. Vertical pump rigid coupling

The rigid coupling of vertical pump is shown in Figure 5-53. This is the coupling used to connect the pump and motor. When the pump itself is equipped with thrust bearing, the pump coupling can be a flexible coupling, just like the coupling used for horizontal pump. When the axial force of the pump and the mass of the pump body are borne by the motor, the following four functions must be possessed: the coupling must be rigid, and bear the axial force and mass of the pump. At the same time, it must be able to adjust the alignment of the pump rotor, and also ensure the concentricity of the two shafts and the transmission of torque. If the pump center can be adjusted at the motor end, the coupling has only two functions. The pump coupling can be lengthened, as shown in Fig. 5-53c, or not, as shown in Fig. 5-53a ↓ b, d, e. If the pump is equipped with a mechanical seal, the pump coupling shall be extended to facilitate the replacement of the mechanical seal. The following several types of rigid couplings are recommended for reference.

1) Fig. 5-53 a-type structure: the connecting screw shall be a pin and a nail, and the adjusting pad is used to adjust the alignment of the pump impeller. The motor and pump shaft head nuts are used to fix their respective shafts, and the adjusting pads are generally monolithic or can be split in half.

2) Fig. 5-53 B-type structure: the connecting screw is also a combination of pin and nail, and the adjusting block and the pump shaft head nut are one by one, which can adjust the centering problem of the pump rotor impeller, and finally tighten it with the connecting bolt.

The connecting holes on the adjustment blocks of 1) and 2) above are larger and do not play a matching role.

3) Fig. 5-53d structure: The motor shaft is positioned by snap ring. After the pump shaft is adjusted to a certain position, it is positioned by passing through the Huff coupling with a cylindrical pin.

4) Figure 5-53e type structure: the motor is positioned by snap ring, which is the same as 3), while the pump shaft uses the thickness of the adjusting block to adjust the alignment of the pump impeller, and finally uses the shaft head screw to tighten it, which is also the positioning of the Huff coupling.

5) The coupling of vertical pump also requires a cover on the motor base (bracket) window.

2. Shaft coupling

The shaft coupling is shown in Figure 5-56. This refers to the coupling parts used to connect the pump shaft and pump shaft. It must also be rigid, and bear the axial force and mass of the pump, and can ensure that the two shafts are coaxial, and can also transmit torque. Its three functions are necessary.

The following types of couplings are recommended for reference:

1) The form shown in Figure 5-56a is threaded connection. The transmission makes the thread tighten more and more depending on the rotation speed. The structure is simple. There is also a section behind the thread that fits and locates with the shaft. It is generally used for small pumps.

2) The form shown in Figure 5-56b is ferrule connection, which is widely used in the pump industry. The upper and lower shafts are connected by split ferrules, and their outer diameters are limited by shaft sleeves.

3) The shown form is that two shaft heads are connected with studs, or one shaft end is connected with threads, as shown in Fig. 5-56f. A shaft sleeve is added outside to transmit torque with a key, and the shaft sleeve is fixed on the key with a jackscrew for positioning.

4) As shown in Fig. 5-56g, the upper and lower shafts use split snap rings with shaft sleeves in the middle, and the upper and lower intermediate shaft sleeves are tightened and positioned with nuts, and the keys transmit torque.

5) The form shown in Figure 5-56h is similar to the structure shown in Figure 5-56b. The two shafts are also connected by ferrules, and the outside is a Huff coupling.

The pump coupling and shaft coupling here are two different concepts. The former has the difference between rigidity and flexibility, and the difference between lengthening and non lengthening. The latter must be rigid, without lengthening.

3. Adjust the center of the pump impeller at the motor end

Adjust the center of the pump impeller at the motor end as shown in Fig. 5-57. Deep well pumps and small condensate pumps can adjust the center of the pump impeller at the motor end. At this time, the pump coupling is not used, but only the shaft coupling. The motor rotor is hollow. The motor shaft passes through the hollow and passes through the support block (also called the motor coupling). The adjustment nut is used for axial adjustment, and the fastening screw is used to tighten it.