水泵是工业冷水机组的关键部件。
它在冷水机和工艺设备之间循环冷冻水，确保足够的流量和稳定的传热。选择合适的水泵并非仅仅是选择功率更大的电机。必须综合考虑三个参数：泵流量、泵扬程和泵功率。
1. 水泵流量是什么意思？
水泵流量是指水泵在特定时间内能够循环的水量。常用单位包括：
• m3/h — 立方米每小时
• 升/分钟 — 升/分钟
• GPM — 加仑/分钟
所需流量主要取决于冷水机的冷却能力以及供水和回水之间的温差。
一般来说：
更高的冷却能力或更小的温差 → 更高的所需水流量。
然而，泵的实际流量还取决于管道系统及其阻力。因此，泵的额定***流量并不一定等于其实际运行流量。
2. 什么是泵扬程？
水泵扬程是指水泵为克服水循环系统中的阻力而提供的能量或压力。
通常以米水柱（mH₂O）表示。
水泵扬程需要克服以下因素：
管道摩擦
• 弯头和阀门
• 过滤器
• 热交换器
• 工艺设备
• 适用情况下的高程差
对于闭式循环工业冷水机组，建筑物的总高度不应简单地加到泵扬程上。主要考虑因素通常是循环回路的总压降。例如，即使所需水流量相对较低，带有多个阀门和换热器的长管道也可能需要扬程更高的泵。
3. 水泵功率是什么意思？
水泵功率是指在所需扬程下输送所需流量所需的电机功率。
通常以千瓦 (kW) 或马力 (HP)为单位。
这种关系可以简化为：
水泵功率 = 流量 × 水泵扬程 ÷ 效率
这意味着，当流量或扬程增加时，所需的泵功率通常也会增加。因此，不应将泵功率作为选择泵的出发点。
正确的选择顺序是：
所需流量 → 所需扬程 → 水泵型号 → 电机功率
例如，两台 5 马力的水泵的流量和扬程性能可能完全不同。
因此，5 马力并不意味着泵的容量是固定的。
4. 流量、扬程和功率共同作用
专业工业冷水机水泵的选择应以水泵的运行点为依据。
水泵性能曲线显示了流量和扬程之间的关系。
一般来说：
流量增大→可用扬程降低
水头升高→可用流量降低
理想的泵应该在优效可靠的运行范围内，提供所需的流量和扬程。
An oversized pump may cause:
• Excessive energy consumption
• Excessive pressure
• Higher noise and vibration An undersized pump may cause:
• Insufficient water flow
• Reduced heat-transfer efficiency
• Unstable process temperature
• Low-flow protection alarms
Therefore, bigger is not always better. The pump should be correctly matched to the actual hydraulic system.
5. Common Water Pumps for Industrial Chillers
For industrial chiller systems, two common pump configurations are widely used.
Vertical Inline Water Pump
Vertical inline pumps are commonly used for large industrial chillers and high-capacity cooling systems.
Advantages include:
• Compact installation
• Space saving
• Suitable for larger water flow requirements
• Convenient integration into large chilled-water systems
They are often selected for large-capacity central cooling systems, industrial plants and applications requiring higher circulation flow.
Stainless Steel Horizontal Centrifugal Pump
Stainless steel horizontal centrifugal pumps are commonly used for small and medium-sized industrial chillers.
Advantages include:
• Simple and reliable construction
• Good corrosion resistance
• Easy maintenance
• Suitable for general industrial water circulation
They are commonly used for injection molding, extrusion, laser cooling, electronics manufacturing and other process cooling applications.
The final pump configuration should always be determined according to the required flow, head, fluid and installation conditions.
6. How to Select a Water Pump for Different Applications?
Different industrial applications have different hydraulic requirements.
Injection Molding
The priority is stable water circulation and temperature control for molds and process equipment. A suitable pump should provide stable flow with sufficient head to overcome the resistance of the mold circuit and connecting pipes.
Extrusion
Extrusion systems may have multiple cooling zones, long pipelines and several valves or heat exchangers.
A pump with sufficient head is therefore important to maintain the required flow throughout the entire system.
Laser Cooling
Laser equipment usually requires stable flow and pressure.
The pump should be selected according to the laser manufacturer's specified flow and pressure requirements, avoiding excessive pressure that could affect sensitive components.
Chemical Industry
Pump selection must consider the fluid's:
• Chemical composition
• Concentration
• Temperature
• Viscosity
• Corrosiveness
For corrosive fluids, stainless steel or other suitable materials may be required.
Food & Beverage
For food, beverage or potable-water applications, the pump material, sealing system and hygiene requirements must be considered. If glycol is used as the secondary coolant, its concentration and viscosity should also be included in the pump calculation.
7. What Information Is Needed for Pump Selection?
要为冷水机组选择合适的泵，应确认以下信息：
1. 制冷能力
2. 供回水温度
3.所需水流量
4. 管道长度和直径
5. 阀门、过滤器和接头
6. 热交换器或设备压降
7. 循环液和浓度
8. 安装条件
通过这些参数，可以准确地确定所需的泵运行点。
结论
水泵不仅仅是连接在冷水机上的电机，它负责将所需的冷冻水流量输送到整个冷却系统。
三个关键参数是：
流量——需要循环多少水？
水泵扬程——水泵必须克服多大的阻力？
功率——需要多大的电机功率？
***工业冷水机水泵的选择并非流量***、扬程***或电机功率***的水泵，而是能够在所需扬程下提供所需流量，同时保持可靠优效运行的水泵。
如果您不确定哪款水泵适合您的工业冷水机，请提供您的制冷量、水温、流量需求和管道状况。专业的冷水机制造商可以根据实际应用情况选择合适的泵。
