How does an unbalanced vane pump work?

How does an unbalanced vane pump work?

A side thrust is made on the rotor shaft due to the difference in pressure between the inlet and outlet port. Due to the sides thrust on the rotor shafts, the bearing’s life is reduced. Due to the pressure difference in the inlet and outlet port, this vane pump is called an unbalanced vane pump.

Are vane pumps balanced?

Balanced vane pumps are fixed displacement pumps consisting of a two-lobe cam ring with two pressure and suction quadrants opposite each other, as shown in Fig. 1. Thus, the rotor is hydraulically balanced and bearing loads are reduced greatly. It is driven by the prime mover and carries the vanes in radial slots.

What is the difference between a balanced and unbalanced vane pump?

Balanced design vane pumps all are fixed displacement. An unbalanced design can be built in either a fixed- or variable-displacement pump. Vane pumps have good efficiency and durability if operated in a clean system using the correct oil. Pump displacement depends on how far a rotor and ring are eccentric.

How does a variable-displacement vane pump work?

A variable-displacement pressure-compensated vane pump works quite differently from a piston pump. Instead of reciprocating pistons, the rotating group of a vane pump is exposed to suction and pressure chambers inside the housing. This reduces effective displacement, reducing flow to reduce downstream pressure.

What is the function of vane pump?

Uses. Vane pumps are commonly used as high-pressure hydraulic pumps and in automobiles, including supercharging, power-steering, air conditioning, and automatic-transmission pumps. Pumps for mid-range pressures include applications such as carbonators for fountain soft-drink dispensers and espresso coffee machines.

Where are balanced vane pumps used?

2) Balanced Vane Pump These vane pumps are versatile in design and most widely used in mobile and industrial applications. The pressure difference doesn’t create between the inlets and outlets because this pump has two inlets and an outlet. The two inlet ports are on opposite sides of each other.

What is the advantage of a balanced vane pump?

The advantages of balanced vane pumps are as follows: The balanced pump eliminates the bearing side loads and therefore high operating pressure can be used. 2. The service life is high compared to the unbalanced type due to less wear and tear.

How can the unbalanced vane pump be used as a variable displacement pump?

Unbalanced vane pumps can have fixed or variable displacements. Some vane pumps provide a balanced construction in which an elliptical casing forms two separate pumping areas on opposite sides of the rotor, so that the side loads cancel out, Figure 6.

What are vane pumps used for?

Vane pumps are commonly used as high-pressure hydraulic pumps and in automobiles, including supercharging, power-steering, air conditioning, and automatic-transmission pumps. Pumps for mid-range pressures include applications such as carbonators for fountain soft-drink dispensers and espresso coffee machines.

What is variable vane pump?

In variable displacement vane pumps, the pump is a device that can convert mechanical energy into fluid energy.

What is the advantage of balanced vane pump over unbalanced type?

The advantages of balanced vane pumps are as follows: 1. The balanced pump eliminates the bearing side loads and therefore high operating pressure can be used. 2. The service life is high compared to the unbalanced type due to less wear and tear.

What are the advantages and disadvantages of a balanced vane pump?

Advantages and disadvantages of balanced vane pumps The advantages of balanced vane pumps are as follows: 1. The balanced pump eliminates the bearing side loads and therefore high operating pressure can be used.

What is the operating range of a vane pump?

The operating range of these pumps varies from – 32 °C to 260 °C. 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.

What is the difference between gear pump and vane pump?

Gear pumps are less expensive but limited to pressures below 140 bar.It is noisy in operation than either vane or piston pumps. Gear pumps are invariably of fixed displacement type, which means that the amount of fluid displaced for each revolution of the drive shaft is theoretically constant.

What is the function of the vanes in a hydraulic pump?

The vanes track along the ring. It provides a tight hydraulic seal to the fluid which is more at the higher rotation speed due to higher centrifugal force. This produces a suction cavity in the ring as the rotor rotates. It creates a vacuum at the inlet and therefore, the fluid is pushed into the pump through the inlet.