什么是双吸泵

What is double suction pump

双吸泵作为离心泵的一种重要形式，因其具有扬程高、流量大等特点，在工程中得到广泛应用。这种泵型的叶轮实际上由两个背靠背的叶轮组合而成，从叶轮流出的水流汇入一个蜗壳中。双吸泵具有如下一些特点:它相当于两个相同直径的单吸叶轮同时工作，在同样的叶轮外径下流量可增大一倍;泵壳水平中开，检查和维修方便，同时，双吸泵进出口在同一方向上且垂直于泵轴，利于泵和进出水管的布置与安装;双吸泵的叶轮结构对称，没有轴向力，运行较平稳。

As an important form of centrifugal pump, double suction pump is widely used in engineering because of its high lift and large flow. The impeller of this type of pump is actually composed of two back-to-back impellers, and the water flowing out of the impeller flows into a volute. The double suction pump has the following characteristics: it is equivalent to two single suction impellers with the same diameter working at the same time, and the flow can be doubled under the same impeller outer diameter; the pump shell is horizontally opened, convenient for inspection and maintenance; at the same time, the inlet and outlet of the double suction pump are in the same direction and perpendicular to the pump shaft, which is conducive to the layout and installation of the pump and the inlet and outlet pipes; The impeller structure of the double suction pump is symmetrical, there is no axial force, and the operation is stable.

产品简介

Product introduction

双吸泵作为离心泵的一种重要形式，因其具有扬程高、流量大等特点，在工程中得到广泛应用。这种泵型的叶轮实际上由两个背靠背的叶轮组合而成，从叶轮流出的水流汇入一个蜗壳中。双吸泵具有如下一些特点:它相当于两个相同直径的单吸叶轮同时工作，在同样的叶轮外径下流量可增大一倍;泵壳水平中开，检查和维修方便，同时，双吸泵进出口在同一方向上且垂直于泵轴，利于泵和进出水管的布置与安装;双吸泵的叶轮结构对称，没有轴向力，运行较平稳。在我国黄河沿线地区提灌泵站流量较大、扬程都较高，大多采用双吸离心泵。南水北调中线惠南庄泵站也采用了双吸泵进行供水。

As an important form of centrifugal pump, double suction pump is widely used in engineering because of its high lift and large flow. The impeller of this type of pump is actually composed of two back-to-back impellers, and the water flowing out of the impeller flows into a volute. The double suction pump has the following characteristics: it is equivalent to two single suction impellers with the same diameter working at the same time, and the flow can be doubled under the same impeller outer diameter; the pump shell is horizontally opened, convenient for inspection and maintenance; at the same time, the inlet and outlet of the double suction pump are in the same direction and perpendicular to the pump shaft, which is conducive to the layout and installation of the pump and the inlet and outlet pipes; The impeller structure of the double suction pump is symmetrical, there is no axial force, and the operation is stable. In the areas along the Yellow River in China, the pumping stations have large flow and high head, and most of them use double suction centrifugal pumps. Huinanzhuang pump station in the middle route of South to north water transfer also uses double suction pump for water supply.

产品结构

product mix

SH型双吸清水离心泵的吸入口与吐出口均在水泵轴心线下方，水平方向与轴线成垂直位置、泵壳中开，检修时无需拆卸进水，排出管路及电动机(或其他原动机)从联轴器向泵的方向看去，水泵均为逆时

The suction port and discharge port of SH type double suction clean water centrifugal pump are both below the pump axis, and the horizontal direction is vertical to the axis, and the pump shell is opened. During maintenance, there is no need to dismantle the water inlet. The discharge pipeline and motor (or other prime mover) are all reverse when viewed from the coupling to the pump

奥利泵

Ollie pump

双吸泵针方向旋转。如根据用户特殊订货需要也可改为顺时针旋转。本型泵的主要另件有:泵体、泵盖、叶轮、轴、双吸密封环、轴套、轴承等。除轴的材料为优质碳素钢外，其馀多为铸铁制成。泵体与泵盖构成叶轮的工作室，在进出水法兰上制有安装真空表和压力表的管螺孔，进出水法兰的下部有用于放水的管螺孔。叶轮经过静平衡校验，用轴套和两侧的轴套螺母固定，其轴向位置可以通过轴套螺母进行调整，叶轮的轴向力利用其叶片的对称布置达到平衡，可能还有一些剩馀轴向力则同轴端的轴承承受。泵轴由两个单列向心球轴承支承，轴承装在泵体两端的轴承体内，用黄油润滑，双吸密封环用以减少水泵压水室的水漏回吸水室。水泵通过联轴器由电动机直接传动.轴封为软填料密封，为了冷却润滑密封腔和防止空气漏入泵内，在填料之间有水封环，水泵工作时少量高压水通过水封管流入填料腔起水封作用。

Double suction pump needle direction rotation. If according to the special order needs of users, it can also be changed to clockwise rotation. The main other parts of this type of pump are: pump body, pump cover, impeller, shaft, double suction seal ring, shaft sleeve, bearing, etc. In addition to the shaft material for high-quality carbon steel, the rest are made of cast iron. The pump body and the pump cover constitute the working room of the impeller. The pipe screw holes for installing the vacuum gauge and the pressure gauge are made on the water inlet and outlet flange, and the lower part of the water inlet and outlet flange is provided with the pipe screw holes for water drainage. After static balance verification, the impeller is fixed by the shaft sleeve and the shaft sleeve nuts on both sides. Its axial position can be adjusted by the shaft sleeve nuts. The axial force of the impeller is balanced by the symmetrical arrangement of its blades, and there may be some residual axial force borne by the bearing at the coaxial end. The pump shaft is supported by two single row centripetal ball bearings. The bearings are installed in the bearing bodies at both ends of the pump body, lubricated with butter, and double suction seal rings are used to reduce the water leakage of the water pressure chamber of the pump back to the water suction chamber. The water pump is directly driven by the motor through the coupling. The shaft seal is a soft packing seal. In order to cool and lubricate the sealing chamber and prevent air from leaking into the pump, there is a water sealing ring between the packing. When the water pump is working, a small amount of high-pressure water flows into the packing chamber through the water sealing pipe to play the role of water sealing.

产品结构图

Product structure chart

1

One

泵体

Pump body

12

Twelve

轴套螺母(右)

Sleeve nut (right)

2

Two

泵盖

Pump cover

13

Thirteen

轴承体

Bearing body

3

Three

泵轴

Pump shaft

14

Fourteen

固定螺栓

Fixing bolt

4

Four

叶轮

impeller

15

Fifteen

轴承体压盖

Bearing gland

5

Five

双吸密封环

Double suction seal ring

16

Sixteen

联轴器部件

Coupling components

6

Six

轴套

axle sleeve

17

Seventeen

圆螺母

Round nut

7

Seven

填料套

Packing sleeve

18

Eighteen

轴承盖(甲)

Bearing cover (a)

8

Eight

水封管

Water seal pipe

19

Nineteen

轴套螺母(左)

Sleeve nut (left)

9

Nine

填料

filler

20

Twenty

轴承挡圈

Bearing retainer

10

Ten

填料环

Packing ring

21

Twenty-one

轴承盖(乙)

Bearing cover (b)

1l

1L

填料压盖

Packing gland

22

Twenty-two

端盖

End cap

双吸清水离心泵型号意义

Model significance of double suction water centrifugal pump

折叠产品用途

Folding product use

Sh型泵是单级双吸卧式中开离心泵。供输送清水及物理化学性质类似于水的液体。液体最高温度不得超过80℃，合适矿山、城市、电站的给排水，农田排涝灌溉和各种水利工程。

SH type pump is a single-stage double suction horizontal split centrifugal pump. For conveying clear water and liquid with physical and chemical properties similar to water. The maximum liquid temperature shall not exceed 80 ℃, suitable for water supply and drainage of mines, cities and power stations, irrigation of farmland drainage and various water conservancy projects.

目前生产的Sh型泵有:

At present, SH pumps are produced as follows:

6Sh-6、6Sh-6A、6Sh-9、6Sh-9A、8Sh-6、8Sh-9、8Sh-9A、8Sh-l3、8Sh-13A、10

6Sh-6、6Sh-6A、6Sh-9、6Sh-9A、8Sh-6、8Sh-9、8Sh-9A、8Sh-l3、8Sh-13A、10

Sh-9、10Sh-9A、10Sh-l3、10Sh-l3A、10Sh-19、10Sh-19A、12Sh-6、12Sh-6A、12Sh-68、12Sh-9、12Sh-9A、12Sh-98、12Sh-l3、12Sh-l3A、12Sh-19、12Sh-l9A、14Sh-6、14Sh-6A、14Sh-68、14Sh-9、14Sh-9A、14Sh-98、14Sh-13、14Sh-l3A。

Sh-9、10Sh-9A、10Sh-l3、10Sh-l3A、10Sh-19、10Sh-19A、12Sh-6、12Sh-6A、12Sh-68、12Sh-9、12Sh-9A、12Sh-98、12Sh-l3、12Sh-l3A、12Sh-19、12Sh-l9A、14Sh-6、14Sh-6A、14Sh-68、14Sh-9、14Sh-9A、14Sh-98、14Sh-13、14Sh-l3A。

双吸泵的结构特点

Structure characteristics of double suction pump

结构紧凑:外形美观，稳定性好，便于安装。

Compact structure: beautiful appearance, good stability, easy to install.

运行平稳:优化设计的双吸叶轮使轴向力减小到最低限度，且有优异水力性能的叶型，并经精密铸造，泵壳内表面及叶轮表面极其光滑具有显著的抗汽蚀性能和高效率。

Smooth operation: the optimized design of double suction impeller reduces the axial force to the minimum, and has excellent hydraulic performance. After precision casting, the inner surface of pump casing and impeller surface are extremely smooth with significant cavitation resistance and high efficiency.

轴封:选用BURGMANN机械密封或填料密封。能保证8000小时运行无泄漏。轴承:选用SKF及NSK轴承保证运行平稳，噪音低，使用寿命长。安装形式:装配时不需调整，可根据现场使用条件。分立式或卧式安装。

Shaft seal: select Burgmann mechanical seal or packing seal. It can guarantee 8000 hours operation without leakage. Bearing: SKF and NSK Bearings are selected to ensure stable operation, low noise and long service life. Installation form: no adjustment is required during assembly, and it can be used according to site conditions. Vertical or horizontal installation.

效率分析

Efficiency analysis

双吸泵效率下降的原因

The reason of efficiency decrease of double suction pump

1、由于水流的冲刷，水泵流道内壁和叶轮过水面变得粗糙不平，水泵内流道的摩阻系数增大，再加上水在泵内的流速很大，水头损失增加。水力效率降低。

1. Due to the erosion of the water flow, the inner wall of the pump passage and the impeller surface become rough and uneven, the friction coefficient of the inner passage of the pump increases, coupled with the large flow rate of water in the pump, the head loss increases. Reduced hydraulic efficiency.

2、由于在泵前投加药物或水质等原因，使泵壳内严重积垢或腐蚀。泵壳内积垢严重的可以使泵壳壁厚增加2ram左右，而且水泵内壁形成垢瘤，使泵体容积缩小、抽水量减少、并且流道粗糙，水头损失增加。客积效率和水力效率都降低。

2. Due to the reason of adding medicine or water quality before the pump, serious scaling or corrosion occurs in the pump shell. In case of serious scaling in the pump casing, the wall thickness of the pump casing can be increased by about 2ram, and the scaling tumor will be formed on the inner wall of the pump, which will reduce the volume of the pump body, reduce the pumping capacity, rough flow channel and increase the head loss. Both the passenger volume efficiency and the hydraulic efficiency are reduced.

3、由于水泵加工

3. Due to water pump processing