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    There are significant differences between gear pump and vane pump in many aspects, mainly including structure, working principle, characteristics and application scenarios.

    First, structural differences
    Gear pump: mainly composed of two gears, pump body and front and back cover. The two gears mesh and rotate in the pump body to form two enclosed Spaces. When the gear rotates, the space volume of the gear off side increases, forming a vacuum and inhaling the liquid; The space volume on the meshing side of the gear decreases and the liquid is squeezed out.
    Vane pump: consists of rotor, stator and blade. The rotor rotates in the stator, the blade is close to the inner surface of the stator under the action of centrifugal force and pressure oil, and the rotor and the inner surface of the stator together constitute the working volume. With the rotation of the rotor, the size of the working volume changes periodically, so as to achieve the suction and discharge of the liquid.
    Second, the difference in working principle
    Gear pump: rely on the working volume change and movement formed between the pump cylinder and the meshing gear to transport liquid or pressurize it. When the gear rotates, the space volume of the gear off side increases, forming a vacuum and inhaling the liquid; The space volume on the meshing side of the gear is reduced and the liquid is squeezed out.
    Vane pump: Through the blade in the rotor slot and the pump housing (stator ring) contact, the suction of the liquid from the oil side to the oil side. When the rotor rotates, the blade is pressed to the inner surface of the stator under the action of centrifugal force and pressure oil to form a sealed working chamber. With the rotation of the rotor, the volume of the working chamber changes periodically, so as to realize the suction and discharge of the liquid.
    Third, the characteristics of the difference
    Gear pump:
    Simple structure, small size, light weight, low cost.
    The cleanliness of the oil is not strictly required, and the price is cheaper.
    However, the force of the pump shaft is not balanced, the wear is serious, the leakage is large, and the noise is relatively large.
    Suitable for low to medium pressure applications, typically up to 3,000 psi (200bar).
    Vane pump:
    Uniform flow, smooth operation, low noise.
    Suitable for medium pressure applications, typically up to 3,000 psi (200bar), but there are variants that can handle higher pressures.
    Some contaminants are more tolerated than gear pumps, but a relatively clean fluid is still required for optimal performance.
    The structure is relatively complex and the cost is high, but it has higher efficiency and reliability in some applications.
    4. Differences in application scenarios
    Gear pump: Because of its simple structure, low cost and easy maintenance, it is widely used in various industrial fields of low pressure, small flow occasions. For example, it is used in petroleum, chemical industry, metallurgy, mining, machinery and other fields to transport various oils, water, emulsion and other liquids.
    Vane pump: Because of its uniform flow, smooth operation and low noise characteristics, it is more suitable for applications with high noise and vibration requirements. For example, it is used in machine tools, ships, aerospace and other fields to transport various lubricants, hydraulic oil and other liquids. In addition, vane pumps are also widely used in food, medicine and other industries with high health requirements.
    In summary, there are significant differences between gear pump and vane pump in terms of structure, working principle, characteristics and application scenarios. In the selection, should be based on the specific application needs, flow, pressure requirements and costs and other factors for comprehensive consideration.