gear pump

The YHB-LY series vertical circular arc gear pump relies on a pair of double circular arc toothed gears to mesh and operate, and completes the suction and discharge of liquid medium by alternately changing the volume of the interdental cavity. The equipment adopts a vertical and direct connection structure between the motor and the pump head, which is suitable for installation in limited space scenarios. It is often equipped with a thin oil station and unit lubrication system, and can operate continuously for a long time. It also supports intermittent start stop operations.

The complete machine components include pump body, pump cover, vertical spindle, driven shaft, double arc gear, balance bearing assembly, shaft end seal, and built-in overflow structure. The gears undergo heat treatment processing, resulting in continuous contact between the tooth profiles and relatively low slip on the tooth surfaces. The pump chamber is equipped with a pressure balance channel to counteract the axial force generated during operation and reduce bearing wear. The shell material can be selected from cast iron or stainless steel as needed; Insulation jacket can be added for conveying easily solidified media; Copper gears can be selected for specific working conditions. The internal moving components rely on the self lubrication of the conveying medium and do not require an independent lubrication system.

The power is directly driven by the vertical spindle to rotate the driving gear, and the driven gear rotates synchronously in the opposite direction. The gear disengages from the meshing area, the cavity volume expands to form negative pressure, and the medium flows into the tooth groove; The medium is transported to the oil pressure area along with the gear, and the gear mesh compresses the cavity volume. The medium is compressed and transported outward, achieving continuous feeding through circulation. The flow rate is linearly related to the rotational speed, and when combined with a speed control device, the conveying capacity can be adjusted. The equipment has basic self-priming ability and can be started and stopped multiple times after the initial injection of medium.

The pump body is equipped with a built-in overflow structure. When the pipeline is blocked or the valve is closed, causing abnormal pressure rise, the medium flows back inside the pump to relieve pressure and reduce equipment damage caused by high pressure. This structure is only used for emergency overload protection and cannot be used for long-term voltage stabilization. When 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 inside, making it easy to flush and clean.

The sealing scheme can be combined with the temperature and corrosion characteristics of the medium to select forms such as packing seal and mechanical seal. The whole machine adopts a split assembly structure. During maintenance, the pump cover can be disassembled to replace the seals, check the status of gears and bearings, and there is no need to dismantle the pipelines as a whole. The insulation style can be used for conveying viscous, low-temperature and easily solidified media.

Suitable for conveying liquid materials that do not contain hard particles, fiber impurities, and have fluidity and lubrication characteristics. The medium has a kinematic viscosity range of 5-1500mm ²/s and can transport fluids such as turbine oil, lubricating oil, diesel, fuel oil, etc. Not suitable for strongly corrosive media, media containing a large amount of solid particles, and low flash point volatile media.

The equipment adopts a vertical chassis flange fixed installation, with the motor arranged vertically and the inlet and outlet pipelines arranged laterally. During installation, the chassis is horizontally fixed and the transmission is in a coaxial state to reduce vibration and wear. It is recommended to install a filtering device in the suction pipeline to prevent impurities from entering the pump chamber. Before starting, the medium inside the pump chamber needs to be retained, and it is forbidden to idle for a long time. The pump body with insulation structure can preheat the chamber before conveying easily solidified materials.

Daily maintenance includes regular cleaning of filters, inspection of seal leaks, monitoring of operating temperature rise and vibration. After conveying viscous materials, use a clean medium to circulate and flush the pump chamber to prevent the materials from drying up and adhering. Long term shutdown requires the removal of residual media from the cavity to reduce the possibility of corrosion and material solidification.

Compared to the horizontal YHB-Y model, the vertical direct connection structure occupies a smaller horizontal installation area; Compared with the conventional involute gear structure, the circular arc tooth profile has low flow pulsation and operating noise. The equipment is commonly used for forced lubrication and oil supply conditions in compressors, refrigeration units, and power station supporting oil stations.