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双吸泵使用
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 has been widely used in engineering because of its high lift, large flow and so on. This pump impeller is actually made up of two back-to-back impellers, and the flow of water from the impeller into a volute. Double suction pump has the following features: it is equivalent to two of the same diameter single suction impeller at the same time, can be doubled in the outer diameter of the impeller under the same flow; the pump shell level in the open, convenient inspection and maintenance, at the same time, double suction pump inlet and outlet in the same direction and perpendicular to the shaft, to pump and water pipe layout and installation; the structure of the impeller symmetric double suction pump, no axial force, relatively stable operation.
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 has been widely used in engineering because of its high lift, large flow and so on. This pump impeller is actually made up of two back-to-back impellers, and the flow of water from the impeller into a volute. Double suction pump has the following features: it is equivalent to two of the same diameter single suction impeller at the same time, can be doubled in the outer diameter of the impeller under the same flow; the pump shell level in the open, convenient inspection and maintenance, at the same time, double suction pump inlet and outlet in the same direction and perpendicular to the shaft, to pump and water pipe layout and installation; the structure of the impeller symmetric double suction pump, no axial force, relatively stable operation. High in the irrigation pumping station flow along the the Yellow River area of our country, big head, most of the double suction centrifugal pump. South to North Water Diversion Project Huinanzhuang pump station also uses a double suction pump for water supply.
：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。
Stable operation: the optimized design of double suction impeller reduces the axial force to a minimum and has excellent hydraulic performance. It is extremely smooth and has high cavitation resistance and high efficiency through precision casting.
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。
Shaft seal: BURGMANN mechanical seal or packing seal. It can guarantee no leakage for 8000 hours. Bearing: SKF and NSK bearings are used to ensure smooth operation, low noise and long service life.
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。
Installation form: without adjustment in assembly, it can be used according to the conditions of field use. Vertical or horizontal installation.
组装图展示：
The assembly diagram shows:
效率分析
Efficiency analysis
双吸泵效率下降的原因
The reason for the decrease of the efficiency of the 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 water flow, the water wall and impeller of the pump channel become rough and uneven. The friction coefficient of the pump flow path increases, and the flow rate of water in the pump is large, and the head loss is increased. The hydraulic efficiency is reduced.
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 reasons in the pump before adding drugs or water, the serious fouling or corrosion of the pump shell. The fouling inside the pump casing can cause the shell thickness of the pump to increase by about 2ram, and the inner wall of the pump forms a scaling tumor, which reduces the volume of the pump body and reduces the pumping volume, and the flow path is rough, and the head loss is increased. Both efficiency and hydraulic efficiency are reduced.
3、由于水泵加工工艺造成的铸造缺陷、汽蚀、磨蚀、腐蚀和化学浸蚀等原因造成泵流道内产生空洞或裂缝，水流动时产生旋涡而造成能量损失。水力效率降低。
3, because of the casting defects, cavitation, abrasion, corrosion and chemical etching caused by the pump processing technology, there are cavitation or cracks in the pump channel. Whirlpool is generated when the water flows, resulting in energy loss. The hydraulic efficiency is reduced.
4、叶轮表面的汽蚀。由于叶片背水面运行时产生负压，当压力Pk<Pva时，产生汽穴和蜂窝表面后，在电化学腐蚀作用下，使泵叶汽蚀。
4. The cavitation of the surface of the impeller. Because of the negative pressure during the running of the back surface of the blade, when the pressure is Pk<Pva, the cavitation and the honeycomb surface are produced, and the cavitation of the pump leaves is caused by the electrochemical corrosion.
5、容积损失和机械损失。由于泵使用时间长，机械磨损产生漏失和阻力增大，使容积效率和机械效率降低。 以上原因，使水泵性能变差。运行效率降低2~5%，严重的可以使水泵效率降低10%以上。
5, volume loss and mechanical loss. Because the pump used for a long time, produce leakage and mechanical wear resistance increases, the volume efficiency and mechanical efficiency. The above reasons make the performance of the pump worse. The operation efficiency is reduced by 2~5%, and the water pump efficiency can be reduced by more than 10%.
提升方案：
Promotion program:
采用高分子复合材料
Polymer composites
在水泵工作过程中，泵内流动的水受到其与流道和泵叶轮表面的摩擦以及水本身粘度的影响，泵所消耗的能量主要用于抵抗水表面的流动摩擦力及涡流阻力。水在流动过程中所消耗的能量(水头损失)就是用来克服内摩擦力和水与设备界面的摩擦力。如果泵、叶轮表面光滑(这种表面称为水力光滑表面)表面阻力较小。消耗能量就小，在水泵过流面和叶轮上喷涂高分子复合材料，使其表面形成水力光滑表面，超光滑表面涂层表面光洁度是经过抛光后不锈钢的20倍，这种极光滑的表面减少了泵内流体的分层，从而减少泵内部紊流，降低了泵内的容积损失和水力损失，降低了电耗。达到降低水流阻力损失的目的，从而提高水泵的水力效率，同时在一定程度上也可提高机械效率和容积效率。涂层分子结构的致密性，能隔绝空气、水等介质和水泵叶轮母材的接触，最大程度减少电化学腐蚀及锈蚀。另外，高分子复合材料本质是高分子聚合物，具有抗化学腐蚀性，可以提高泵的抗腐蚀性，能大大增强泵抵抗冲蚀和抗腐蚀能力。
In the process of pump operation, the flow of water in the pump is affected by its friction with the surface of the pump and the impeller and the viscosity of the water itself. The energy consumed by the pump is mainly used to resist the flow friction and eddy current resistance of the water surface. The energy consumed in the flow of water (head loss) is used to overcome internal friction and the friction between the water and the interface of the equipment. If the surface of the pump and impeller is smooth (this surface is called a hydraulic smooth surface), the surface resistance is smaller. The energy consumption is small, the pump flow surface of impeller and spraying polymer composite materials, the formation of the hydraulic smooth surface on the surface of ultra smooth surface coating surface finish is after 20 times after polishing stainless steel, this extremely smooth surface reduces stratification within the pump fluid from the pump, reduce internal turbulence, reduce the pump volume loss and hydraulic loss, reduces the power consumption. The aim of reducing the loss of flow resistance is to improve the hydraulic efficiency of the pump, and to a certain extent, the mechanical efficiency and the volume efficiency can be improved. The density of the molecular structure of the coating can cut off the contact of the air, water and other medium with the impeller of the pump, and reduce the corrosion and corrosion to the maximum extent. In addition, the essence of polymer composites is polymer, which has chemical corrosion resistance, can improve the corrosion resistance of pumps, and greatly enhance the ability of pump to resist erosion and corrosion resistance.
采用新型密封技术
New sealing technology
水泵在工作过程中有一部分能量损失，其中包括机械磨损、容积损失和水力损失，机械损失是指水泵的轴套密封摩擦、轴承摩擦、叶轮表面与液体摩擦等。采用Blu-Goo超级润滑剂来降低水泵轴套密封摩擦、轴承摩擦，从而达到提高水泵效率、节能降耗的目的。其是一种有多种用途的特殊惰性材料，主要用于降低金属间接触。作为一种螺纹密封复合物，该材料在外螺纹和
There are some energy losses in the process of pump operation, including mechanical wear, volumetric loss and hydraulic loss. Mechanical loss refers to the pump shaft seal friction, bearing friction, impeller surface and liquid friction. The Blu-Goo super lubricant is used to reduce the seal friction of the pump shaft and the friction of the bearing, so as to improve the efficiency of the pump and save energy and reduce the consumption. It is a special inert material for many uses, which is mainly used to reduce the contact between metals. As a thread sealing compound, the material is in the outer thread and in the outer thread.
As an important form of centrifugal pump, double suction pump has been widely used in engineering because of its high lift, large flow and so on. This pump impeller is actually made up of two back-to-back impellers, and the flow of water from the impeller into a volute. Double suction pump has the following features: it is equivalent to two of the same diameter single suction impeller at the same time, can be doubled in the outer diameter of the impeller under the same flow; the pump shell level in the open, convenient inspection and maintenance, at the same time, double suction pump inlet and outlet in the same direction and perpendicular to the shaft, to pump and water pipe layout and installation; the structure of the impeller symmetric double suction pump, no axial force, relatively stable operation.
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 has been widely used in engineering because of its high lift, large flow and so on. This pump impeller is actually made up of two back-to-back impellers, and the flow of water from the impeller into a volute. Double suction pump has the following features: it is equivalent to two of the same diameter single suction impeller at the same time, can be doubled in the outer diameter of the impeller under the same flow; the pump shell level in the open, convenient inspection and maintenance, at the same time, double suction pump inlet and outlet in the same direction and perpendicular to the shaft, to pump and water pipe layout and installation; the structure of the impeller symmetric double suction pump, no axial force, relatively stable operation. High in the irrigation pumping station flow along the the Yellow River area of our country, big head, most of the double suction centrifugal pump. South to North Water Diversion Project Huinanzhuang pump station also uses a double suction pump for water supply.
：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。
Stable operation: the optimized design of double suction impeller reduces the axial force to a minimum and has excellent hydraulic performance. It is extremely smooth and has high cavitation resistance and high efficiency through precision casting.
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。
Shaft seal: BURGMANN mechanical seal or packing seal. It can guarantee no leakage for 8000 hours. Bearing: SKF and NSK bearings are used to ensure smooth operation, low noise and long service life.
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。
Installation form: without adjustment in assembly, it can be used according to the conditions of field use. Vertical or horizontal installation.
组装图展示：
The assembly diagram shows:
效率分析
Efficiency analysis
双吸泵效率下降的原因
The reason for the decrease of the efficiency of the 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 water flow, the water wall and impeller of the pump channel become rough and uneven. The friction coefficient of the pump flow path increases, and the flow rate of water in the pump is large, and the head loss is increased. The hydraulic efficiency is reduced.
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 reasons in the pump before adding drugs or water, the serious fouling or corrosion of the pump shell. The fouling inside the pump casing can cause the shell thickness of the pump to increase by about 2ram, and the inner wall of the pump forms a scaling tumor, which reduces the volume of the pump body and reduces the pumping volume, and the flow path is rough, and the head loss is increased. Both efficiency and hydraulic efficiency are reduced.
3、由于水泵加工工艺造成的铸造缺陷、汽蚀、磨蚀、腐蚀和化学浸蚀等原因造成泵流道内产生空洞或裂缝，水流动时产生旋涡而造成能量损失。水力效率降低。
3, because of the casting defects, cavitation, abrasion, corrosion and chemical etching caused by the pump processing technology, there are cavitation or cracks in the pump channel. Whirlpool is generated when the water flows, resulting in energy loss. The hydraulic efficiency is reduced.
4、叶轮表面的汽蚀。由于叶片背水面运行时产生负压，当压力Pk<Pva时，产生汽穴和蜂窝表面后，在电化学腐蚀作用下，使泵叶汽蚀。
4. The cavitation of the surface of the impeller. Because of the negative pressure during the running of the back surface of the blade, when the pressure is Pk<Pva, the cavitation and the honeycomb surface are produced, and the cavitation of the pump leaves is caused by the electrochemical corrosion.
5、容积损失和机械损失。由于泵使用时间长，机械磨损产生漏失和阻力增大，使容积效率和机械效率降低。 以上原因，使水泵性能变差。运行效率降低2~5%，严重的可以使水泵效率降低10%以上。
5, volume loss and mechanical loss. Because the pump used for a long time, produce leakage and mechanical wear resistance increases, the volume efficiency and mechanical efficiency. The above reasons make the performance of the pump worse. The operation efficiency is reduced by 2~5%, and the water pump efficiency can be reduced by more than 10%.
提升方案：
Promotion program:
采用高分子复合材料
Polymer composites
在水泵工作过程中，泵内流动的水受到其与流道和泵叶轮表面的摩擦以及水本身粘度的影响，泵所消耗的能量主要用于抵抗水表面的流动摩擦力及涡流阻力。水在流动过程中所消耗的能量(水头损失)就是用来克服内摩擦力和水与设备界面的摩擦力。如果泵、叶轮表面光滑(这种表面称为水力光滑表面)表面阻力较小。消耗能量就小，在水泵过流面和叶轮上喷涂高分子复合材料，使其表面形成水力光滑表面，超光滑表面涂层表面光洁度是经过抛光后不锈钢的20倍，这种极光滑的表面减少了泵内流体的分层，从而减少泵内部紊流，降低了泵内的容积损失和水力损失，降低了电耗。达到降低水流阻力损失的目的，从而提高水泵的水力效率，同时在一定程度上也可提高机械效率和容积效率。涂层分子结构的致密性，能隔绝空气、水等介质和水泵叶轮母材的接触，最大程度减少电化学腐蚀及锈蚀。另外，高分子复合材料本质是高分子聚合物，具有抗化学腐蚀性，可以提高泵的抗腐蚀性，能大大增强泵抵抗冲蚀和抗腐蚀能力。
In the process of pump operation, the flow of water in the pump is affected by its friction with the surface of the pump and the impeller and the viscosity of the water itself. The energy consumed by the pump is mainly used to resist the flow friction and eddy current resistance of the water surface. The energy consumed in the flow of water (head loss) is used to overcome internal friction and the friction between the water and the interface of the equipment. If the surface of the pump and impeller is smooth (this surface is called a hydraulic smooth surface), the surface resistance is smaller. The energy consumption is small, the pump flow surface of impeller and spraying polymer composite materials, the formation of the hydraulic smooth surface on the surface of ultra smooth surface coating surface finish is after 20 times after polishing stainless steel, this extremely smooth surface reduces stratification within the pump fluid from the pump, reduce internal turbulence, reduce the pump volume loss and hydraulic loss, reduces the power consumption. The aim of reducing the loss of flow resistance is to improve the hydraulic efficiency of the pump, and to a certain extent, the mechanical efficiency and the volume efficiency can be improved. The density of the molecular structure of the coating can cut off the contact of the air, water and other medium with the impeller of the pump, and reduce the corrosion and corrosion to the maximum extent. In addition, the essence of polymer composites is polymer, which has chemical corrosion resistance, can improve the corrosion resistance of pumps, and greatly enhance the ability of pump to resist erosion and corrosion resistance.
采用新型密封技术
New sealing technology
水泵在工作过程中有一部分能量损失，其中包括机械磨损、容积损失和水力损失，机械损失是指水泵的轴套密封摩擦、轴承摩擦、叶轮表面与液体摩擦等。采用Blu-Goo超级润滑剂来降低水泵轴套密封摩擦、轴承摩擦，从而达到提高水泵效率、节能降耗的目的。其是一种有多种用途的特殊惰性材料，主要用于降低金属间接触。作为一种螺纹密封复合物，该材料在外螺纹和
There are some energy losses in the process of pump operation, including mechanical wear, volumetric loss and hydraulic loss. Mechanical loss refers to the pump shaft seal friction, bearing friction, impeller surface and liquid friction. The Blu-Goo super lubricant is used to reduce the seal friction of the pump shaft and the friction of the bearing, so as to improve the efficiency of the pump and save energy and reduce the consumption. It is a special inert material for many uses, which is mainly used to reduce the contact between metals. As a thread sealing compound, the material is in the outer thread and in the outer thread.
