叶片泵

• 由于齿轮齿和泵壳之间的间隙，齿轮泵具有小泄漏的缺点。这个限制是克服叶片泵。
• The leakage is reduced by using spring or hydraulically loaded vanes placed in the slots of the driven rotor.
• Vane pumps are available in a number of vane configurations including sliding vane, flexible vane, swinging vane, rolling vane, and external vane etc.
• The operating range of these pumps varies from – 32 °C to 260 °C.

Working principle of Vane Pump :

• The schematic of the vane pump working principle is shown in figure. Vane pumps generate a pumping action by tracking of vanes along the casing wall.
• The rotor in a vane pump is connected to the prime mover through a shaft. The vanes are located on the slotted rotor.
• 转子偏心放置在凸轮环内，如图所示。转子被两个侧板密封到凸轮中。
• 原动机转子旋转时,叶片are thrown outward due to centrifugal force. The vanes track along the ring.
• 它为流体提供了紧密的液压密封，其由于较高的离心力而言更高的旋转速度。当转子旋转时，这在环中产生抽吸腔。它在入口处形成真空，因此，通过入口将流体推入泵中。

• 通过叶片的叶片缠绕在出口周围，其缩回使流体被排出。
• 泵的容量取决于偏心，叶片的膨胀，以及转子叶片的宽度和速度。可以注意到，当偏心率为零时，不会发生流体流动。
• These pumps can handle thin liquids (low viscosity) at relatively higher pressure.
• 然而，这些泵不适用于高速应用和高粘度流体或携带一些磨料颗粒的流体。
• 由于许多活动部件，维护成本也更高。

叶片泵类型

有两种类型的叶片泵：

1.不平衡叶片泵：Unbalanced vane pumps are of two varieties:

• Unbalanced vane pump with fixed delivery.
• 具有压力补偿可变输送的不平衡叶片泵。

2. Balanced vane pump.

Unbalanced Vane Pump with Fixed Delivery

具有固定输送的简化形式的不平衡叶片泵及其操作示于图1和2中。泵的主要部件是凸轮表面和转子。转子包含花束到驱动轴的径向槽。转子在凸轮环内旋转。每个径向槽包含一个叶片，该叶片由于离心力而自由滑入或从槽中滑出。叶片设计成与转子转动时与凸轮环的表面配合。凸轮环轴偏移到驱动轴轴线。当转子旋转时，离心力将叶片推出在凸轮环的表面上。叶片将转子和凸轮环之间的空间划分为一系列小腔室。在转子旋转的前半部分期间，这些腔室的体积增加，从而导致压力降低。

这是抽吸过程，导致流体流过入口。在转子旋转的下半部分期间，凸轮环将叶片推回槽中，捕获的体积减小。这将捕获的液体肯定地通过出口射出。在这方面泵，所有泵动作都在位于转子和轴一侧的腔室中进行，因此泵是不平衡的设计。泵的输送速率取决于转子相对于凸轮环的偏心率。

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Read More :

• Screw Pump | Working, Design, Advantages and Disadvantages
• 外齿轮泵|设计，优点和缺点
• What is Positive Displacement Pumps | Types and Advantages

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Balanced Vane Pump with Fixed Delivery

A balanced vane pump is a very versatile design that has found widespread use in both industrial and mobile applications. The basic design principle is shown in Fig. The rotor and vanes are contained within a double eccentric cam ring and there are two inlet segments and two outlet segments during each revolution. This double pumping action not only gives a compact design, but also leads to another important advantage: although pressure forces acting on the rotor in the outlet area are high, the forces at the two outlet areas are equal and opposite, completely canceling each other. As a result, there are no net loads on shaft bearings. Consequently, the life of this type of pump in many applications has been exceptionally good. Operating times of 24000 h or more in industrial applications are widespread. In more severe conditions encountered in mobile vehicles, 5000–10000 h of trouble-free operation is frequently achieved.

平衡叶片泵图：

Advantages and disadvantages of Vane Pumps

叶片泵的优点如下：
1.叶片泵是自初步，稳健的，并在给定速度提供恒定的递送。
2. They provide uniform discharge with negligible pulsations.
3. Their vanes are self-compensating for wear and vanes can be replaced easily.
4.这些泵不需要止回阀。
5. They are light in weight and compact.
6. They can handle liquids containing vapors and gases.
7.体积和总体效率很高。
8.放电对粘度和压力变化的变化不太敏感。

叶片泵的缺点如下：

1.在突然关闭交货时，需要释放阀门保护泵。
2. They are not suitable for abrasive liquids.
3. They require good seals.
4. They require good filtration systems and foreign particles can severely damage the pump.

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Advantages and disadvantages of balanced vane pumps

平衡叶片泵的优点如下：

1. The balanced pump eliminates the bearing side loads and therefore high operating pressure can be used.
2.由于磨损较小和撕裂，使用寿命与不平衡类型相比。

The disadvantages of balanced vane pumps are as follows:

1. They are fixed displacement pumps.
2. Design is more complicated.
3. The manufacturing cost is high compared to the unbalanced type.

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Application of Vane Pump :

These pumps have various applications for the pumping of the following fluids:

• Aerosol and Propellants
• 航空服务 - 燃料转移，除冰
• 汽车行业 - 燃料，润滑剂，制冷冷却剂
• Bulk Transfer of LPG and NH3
• LPG Cylinder Filling
• Alcohols
• 制冷 - 弗兰索，氨
• 溶剂