Hydraulic pumps can be categorized into gear pumps, vane pumps and piston pumps according to their structural form. The pump formed by two gears meshing with each other is called a gear pump. Gear pumps belong to a type of volumetric rotary pump. It is generally used to convey liquids with lubricating properties. Gear pumps are used in a wide range of applications, such as conveying fuel oil and lubricating oil, etc. This article will provide you with a detailed introduction to the relevant knowledge of gear pumps, and I hope it will be helpful to you.
1.Working principle
Gear pumps have a pair of meshing gears in the shell, one of which is the active gear, the other is a driven gear, driven by the active gear meshing rotation. There is a small gap between the gears and the pump casing. When the gear rotates, the teeth gradually disengage from the meshing of the left side of the suction chamber, the closed volume between the teeth increases, forming a local vacuum, the liquid is sucked into the suction chamber under the action of differential pressure, as the gear rotates, the liquid is divided into two ways between the gears and the pump casing by the gears to push forward, to the right side of the discharge chamber, the discharge cavity of the two gears gradually mesh, the volume decreases, the liquid between the gears is squeezed to the discharge port.
2.Classification
According to the form of gear meshing can be divided into: external meshing type and internal meshing type
(1) External mesh type. The active gear and the driven gear are external gears, external gear pumps are the most widely used type of gear pumps, in general, we say that the gear pump usually refers to external gear pumps. The price of external gear pumps is low, but the maintenance cost is relatively high.
(2) Internal meshing type. As the name suggests, the internal gear pump species, the active gear for the internal gear, the driven gear for the external gear. Internal gear pump and external gear pump comparison, compact structure, small size, good suction performance. But the tooth shape is complex, not easy to process. Generally used in high-pressure hydraulic systems, such as the hydraulic system on the airplane. The price of internal gear pump is high, but the maintenance cost is relatively low.
In addition, according to the tooth curve, gear pumps can be divided into: involute tooth form and cycloid type; according to the form of tooth surface can be divided into: straight tooth gear type, helical tooth gear type, herringbone tooth gear type, the number of gears of the arc tooth surface; according to the number of gears can be divided into the two gear type and multi-gear type; according to the number of gear stages can be divided into: single-stage gear pumps and multi-stage gear pumps... ...
3. How to buy gear pumps
(1) According to the arrangement of the device, terrain conditions, water level conditions, operating conditions, to determine the choice of horizontal, vertical and other types (pipeline, submersible, submerged, non-clogging, self-priming, gear-type, etc.) of the gear pump.
(2) According to the nature of the liquid medium, to determine the clear water gear pumps, hot water gear pumps or oil gear pumps, chemical gear pumps or corrosion-resistant gear pumps or impurity gear pumps, or the use of non-clogging gear pumps. Gear pumps installed in explosive areas should adopt corresponding explosion-proof motors according to the level of explosive areas.
(3) according to the flow size, to determine the selection of single suction gear pumps or double suction gear pumps; according to the head height, selection of single-stage gear pumps or multi-stage gear pumps, high speed gear pumps or low speed gear pumps (air-conditioning gear pumps), multi-stage gear pumps than the efficiency of a single-stage gear pumps, such as the selection of a single-stage gear pumps and multi-stage gear pumps can be used, the first selection of single-stage gear pumps.
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