Circular arc gear pump structure

Circular arc gear pump is mainly composed of gear, shaft, pump body, pump cover, bearing sleeve, shaft end seal, etc; The gear is made of double arc sinusoidal curve tooth profile. Compared with involute gear, its most outstanding advantage is that there is no relative sliding on the tooth profile during gear meshing, so the tooth surface has no wear, stable operation, no liquid trapping, low noise, long service life and high efficiency; The pump gets rid of the shackles of traditional design, which makes the gear pump enter a new field in design, production and use.

Causes of insufficient output flow of circular arc gear pump:

1. The tooth side clearance of inner and outer rotors is too large, so that the pressure suction oil chamber is interconnected, the volumetric efficiency is significantly reduced, and the output flow is not enough;

2. Large axial clearance;

3. The joint surface in the oil suction pipeline is not tightly sealed, so that the pump sucks in air and the effective suction flow is reduced;

4. Poor oil absorption. If the oil viscosity is too high and the oil filter is blocked by dirt, the suction flow is reduced;

5. The overflow valve is stuck at the half opening position, and part of the flow from the pump returns to the oil tank through the overflow valve, resulting in insufficient flow into the system. At this time, there is a fault that the system pressure does not go up.

Characteristics of various seals of circular arc gear pump:

1. When the circular arc gear pump made of stainless steel adopts FBD or foed graphite mechanical seal. This situation is generally used under the working conditions of circular arc gear pump conveying food grade grease or food grade similar grease.

2. When the circular arc gear pump made of stainless steel adopts 58u or 59u graphite mechanical seal. This situation is generally used under the working conditions of circular arc gear pump conveying food grade grease or food grade similar grease, high sanitary conditions and high temperature.

3. When the circular arc gear pump adopts magnetic seal, the material selection of the main circular arc gear pump is correct, which can be applied to all working conditions and occasions without leakage for life. It is mostly used to transport more expensive media, or to prevent leakage in chemical enterprises.

4. Ordinary cast iron circular arc gear pump is assembled with graphite ring and skeleton oil seal. This situation is suitable for circular arc gear pump to transport generally lubricating, low temperature and non corrosive media.

5. Ordinary cast iron circular arc gear pump adopts FBD or foed graphite mechanical seal. This situation is suitable for the use of circular arc gear pump under the conditions of no leakage of seal, lubricity of medium, normal temperature and no corrosion. The use effect is better than the first case. But the cost has increased.

6. Ordinary cast iron circular arc gear pump adopts FBD or FOD alloy or silicon carbide mechanical seal. This situation is suitable for circular arc gear pump when it is required to seal without leakage, medium has slight impurities, medium has lubricity, normal temperature and no corrosion. The service life of the seal is longer than that of the graphite mechanical seal. But the cost has increased.

7. The circular arc gear pump made of stainless steel is assembled with PTFE packing and PTFE skeleton oil seal. This situation is generally used in the working conditions when the circular arc gear pump transports corrosive, impurities or no impurities but the medium viscosity is high.

Therefore, the sealing form of each gear oil pump is determined according to the characteristics of the materials transported by the pump. If you have special requirements, you must explain it when ordering, and we will install it for you!