gear pump

Gear pump is a volumetric conveying equipment, which relies on a pair of interlocking driving gears and driven gears to rotate, and uses the alternating volume of the interdental cavity to achieve continuous suction and discharge of liquid medium. The equipment often adopts a horizontal structure with a simple layout, which can operate continuously for a long time and also supports intermittent start stop operations. It is applied in industrial fluid transportation scenarios.

The main components of the whole machine include the pump body, pump cover, driving shaft, driven shaft, gears, bearings, and shaft end sealing components. Gears undergo heat treatment processing to improve meshing accuracy. A pressure relief channel is arranged inside the pump chamber to balance the axial forces generated during operation and reduce friction component losses. Different shell materials such as cast iron and stainless steel can be selected according to the medium conditions; For easily solidified media, insulation jackets can be installed; When there is a need, copper gear structure can be selected. The internal moving parts rely on the conveying medium to achieve self lubrication, without the need for an independent lubrication system.

The power is driven by the coupling to drive the driving gear, and the driven gear rotates synchronously in the opposite direction. On the side where the gear disengages, the volume of the cavity gradually expands, forming negative pressure to suck in the medium; The medium is stored in the tooth groove space and transported to the oil pressure area as the gear rotates; The gears enter the meshing state, the cavity volume shrinks, the medium is compressed and transported outward, and the cycle completes continuous feeding. The flow rate is linearly related to the rotational speed, and can be adjusted with a speed control device to regulate the conveying flow rate. The equipment has basic self-priming performance and can be started and stopped multiple times after the initial injection of the medium.

Some models are equipped with built-in overflow structures. When the pipeline is blocked or the valve is closed, causing abnormal pressure, the medium flows back and releases pressure inside the pump, reducing the impact of high pressure on the equipment structure. This structure is designed for emergency protection and cannot be continuously refluxed and stabilized for a long time. If there is a need for constant pressure transmission, an external pressure regulating pipeline can be connected. The pump chamber flow channel is unobstructed with fewer dead corners, making it easy for daily flushing and cleaning.

The sealing form can be selected based on the temperature and corrosiveness of the medium, including types such as packing seal and mechanical seal. The overall structure adopts a split assembly, and the pump cover can be disassembled for inspection and replacement of seals and gear components during maintenance, without the need to remove all pipelines. The temperature range of the medium applicable to conventional working conditions is wide, and the insulation style can meet the requirements of transporting viscous and easily solidified media.

The suitable medium is a liquid material that does not contain hard particles, fiber debris, and has fluidity. It is suitable for a kinematic viscosity range of 5-1500mm ²/s and can transport fuel, lubricating oil, vegetable oil, and mildly corrosive liquid raw materials. The equipment is not suitable for transporting strongly corrosive media and materials containing a large amount of solid particles.

The installation adopts a fixed base form, with standard installation holes reserved, and flange interfaces adapted to conventional industrial pipelines. Correct coaxiality during coupling assembly to reduce vibration wear. It is recommended to install a filtering device in the suction pipeline to prevent impurities from entering the pump chamber. Before starting, a medium needs to be retained inside the chamber, and prolonged idling is prohibited. The pump body equipped with insulation structure can preheat the chamber before transporting easily solidified materials.

Daily maintenance work includes regular cleaning of filters, inspection of seal leaks, monitoring of operating temperature rise and vibration. After conveying viscous media, use clean media to circulate and flush the pump chamber to prevent material from drying and adhering. During long-term shutdown, empty the residual medium inside the cavity to reduce the risk of corrosion and solidification.

This type of equipment has strong universality, stable operation, and moderate maintenance workload. It is mostly used for conventional working conditions such as medium transfer, furnace oil supply, and lubrication oil supply.