加气混凝土专用泵的优点

(1)流量均匀。当螺杆旋转时，密封腔连续向前推进，各瞬时排出量相同。因此，螺杆泵的流量比往复泵、齿轮泵要均匀。
    (2)受力情况良好。多数螺杆泵的主动螺杆不受径向力,所有从动螺杆不受扭转力矩的作用。因此,螺杆泵的使用寿命较长。有些泵做成双吸结构，还可以平衡轴向力。
    (3)除单螺杆泵外,其他螺杆泵无往复运动，不受惯性力影响，故转速可以较高，一般转速为1500~ 3000r/ min。
    (4)运转平稳.嗓声小。被输送液体不受搅拌作用。螺杆泵密封腔空间较大，有少量杂质颗粒也不妨碍工作。
    (5)具有良好的自吸能力，因螺杆密封性好，可以排送出气体，启动时可不用罐泵，可作气液混相输送。由于密封性好，可在较高压力下工作，压力可达300*10Pa。
三、加气混凝土专用泵的类型及其特点

三种类型螺杆泵的比较见表2-2。
四、加气混凝土专用泵在油气混输中的应用
    在油气田开发工程中.用于远距离输送未经处理的原油或部分处理的油气水多相混合液体的气液两相流泵或油气水多相流泵称为多相泵，或称为混输泵。采用多相泵技术可以缩短油田生产周期，提高油田产量，节省油田投资，延长老油田寿命。
    目前国外已开发研制出多种类型的多相泵，按照使用场合不同，分为陆上多相泵和水下多相泵;按照工作原理的不同，又可分为旋转动力式多相泵和容积式多相泵，前者包括螺旋轴流式多相泵、离心泵、对转式湿式压缩机等，后者包括单螺杆泵、双螺杆泵、隔膜泵、线性活塞泵等。

Advantages of special pump for aerated concrete

(1) The flow rate is uniform. When the screw rotates, the seal chamber is pushed forward continuously, and the instantaneous discharge is the same. Therefore, the screw pump flow than reciprocating pump, gear pump to uniform.

(2) The stress condition is good. The driving screw of most screw pumps is not affected by radial force, and all driven screws are not affected by torsion moment. Therefore, the service life of screw pump is longer. Some pumps made of double suction structure, can also balance the axial force.

(3) In addition to single screw pump, other screw pumps have no reciprocating motion and are not affected by inertial force, so the speed can be higher, generally 1500 ~ 3000r / min.

(4) Smooth operation and low voice. The transported liquid is not agitated. Screw pump seal cavity space is large, there is a small amount of impurity particles do not hinder the work.

(5) It has good self-priming ability. Because of the good sealing performance of screw, it can discharge gas. It can be used for gas-liquid mixed phase transportation without tank pump when starting. Due to its good sealing performance, it can work under high pressure, and the pressure can reach 300 * 10Pa.

3、 Characteristics of aerated concrete pump

The comparison of the three types of screw pumps is shown in table 2-2.

4、 Application of special pump for aerated concrete in oil and gas mixed transportation

In the oil and gas field development project, the gas-liquid two-phase flow pump or oil-gas-water multiphase flow pump used for long-distance transportation of untreated crude oil or partially treated oil-gas-water multiphase mixed liquid is called multiphase pump or mixed transportation pump. The application of multiphase pump technology can shorten the production cycle of oilfield, improve the production of oilfield, save investment and prolong the life of old oilfield.

At present, many kinds of multiphase pumps have been developed abroad, which can be divided into onshore multiphase pumps and underwater multiphase pumps; According to different working principles, it can be divided into rotary power multiphase pump and positive displacement multiphase pump. The former includes spiral axial flow multiphase pump, centrifugal pump, counter rotating wet compressor, etc., while the latter includes single screw pump, twin-screw pump, diaphragm pump, linear piston pump, etc.