Business is getting harder and harder now, with prices transparent. Customers still want cheaper prices. Copper wire has exceeded 90,000. Many bosses are waiting and seeing, maybe one day, the price will rise. The key is that we cannot control this copper. We can only hope that copper prices will fall back to the range of 60,000 to 70,000 in previous years. This way, everyone's production and life can be a little easier.
Today, the product we are going to talk about is the ROP-210HA WEILIANG oil pump. This oil pump product is a common product under WEILIANG. After years of innovation and research and development, this product can better meet customer needs. In order to meet the actual needs of customers, we have continued to increase investment in research and development, and designed products that better meet customer needs. Beautiful in appearance, good quality and low price. Our goal and pursuit is to allow customers to use such products. We look forward to your incoming call for consultation, and we will wholeheartedly provide you with good service.
The ROP-210HA WEILIANG oil pump belongs to the internal meshing gear pump. Its core relies on volume changes to realize the suction, transportation and discharge of oil. The specific working principle combined with its structural characteristics can be divided into the following key steps:
Basic core structure
This oil pump is mainly composed of a circular pump casing, an outer rotor (internal gear), an inner rotor (external gear) and a drive shaft. The number of teeth of the inner rotor is one less than that of the outer rotor, and there is an eccentricity between the center of the inner rotor and the center of the outer rotor. The drive shaft is connected to the center of the inner rotor. This eccentric structure and tooth difference design are the key to realizing the oil pumping function.
Oil suction process
When the drive shaft drives the inner rotor to rotate, the inner rotor will drive the outer rotor to rotate synchronously in the same direction. During the rotation of the two rotors, the eccentric structure causes the tooth gap on one side of the rotor to gradually expand. This gap expansion process will form a negative pressure in this area in the pump casing. The oil in the fuel tank is sucked into these expanded tooth gaps through the oil suction port of the oil pump under the action of external atmospheric pressure, completing the oil suction action.
Oil transportation and pressure oil process
As the inner and outer rotors continue to rotate, the tooth sealing cavity that has sucked in oil will gradually move to the oil discharge side of the oil pump as the rotors rotate. At this time, the teeth on the other side of the rotor begin to mesh gradually, so that the tooth gap that originally contained oil is continuously squeezed and narrowed. The reduction of the sealing cavity space will squeeze the internal oil, thereby increasing the oil pressure.
Oil discharge and complete cycle
When the tooth gap is squeezed to the minimum and the oil pressure reaches a certain level, the high-pressure oil will be forcibly discharged through the oil discharge port of the oil pump. Then the inner and outer rotors continue to rotate, and the tooth gap enters the expansion-contraction cycle again, and so on, realizing the continuous transportation of oil.
This working method that relies on rotor meshing to change volume allows the ROP-210HA WEILIANG oil pump to have the advantages of less wear, low noise and compact structure. It is often used in machine tool cooling oil transportation, ship fuel transportation, food industry oil change equipment and other scenarios.
The ROP-210HA WEILIANG oil pump is essentially an internal meshing gear pump with a special tooth profile, while the commonly mentioned gear oil pumps are mostly external meshing gear pumps (including common internal meshing types). The two differ significantly in structure, operating performance, applicable scenarios and other aspects. The specific differences are as follows:
Structural construction
Gerotor pump: The core is composed of an inner rotor (cycloidal teeth) and an outer rotor. The number of teeth of the inner rotor is one less than that of the outer rotor, and there is an eccentricity between the centers of the two rotors. There is no need for additional isolation elements such as a crescent-shaped partition. A sealed cavity can be formed only through the meshing of the inner and outer rotors. The overall number of parts is small and the structure is compact. Some small models can be pressed with powder metallurgy.
Gear oil pump: The external meshing type is the mainstream, which is composed of two involute gears with the same parameters, a pump casing, a drive shaft and so on. The internal meshing type requires a crescent-shaped partition to separate the oil suction chamber and the oil pressure chamber. Its gear tooth profile is mostly involute, the center distance between the two gears is fixed, and the sealing and transmission are realized by gear meshing. Although the structure is simple, the component layout is looser compared with the gerotor pump.
Operating performance
Speed adaptation: The gerotor pump has excellent high-speed characteristics, with a large range of oil suction and discharge angles. The centrifugal force during high-speed rotation can help the oil fill the tooth valleys, and there will be no "cavitation" problem. The speed range can reach hundreds to nearly 10,000 rpm. While the speed of the gear oil pump is obviously limited, usually not exceeding 3000rpm. If the speed is too high, the tooth valleys are prone to insufficient oil filling and form "cavitation", which greatly reduces the oil pumping efficiency.
Noise and stability: When the gerotor pump is meshed, the sliding speed of the tooth surface is small, the envelope angles of the oil suction chamber and the oil discharge chamber are close to 145°, the oil flow and movement are stable, and the operating noise is extremely low. The gear oil pump has a large gear meshing impact, and the oil suction and discharge process has a fast rhythm, so not only the operating stability is slightly poor, but also the generated noise is much higher than that of the gerotor pump.
Volumetric efficiency: The gerotor pump has good sealing performance, and the volumetric efficiency can reach more than 95%. The gear oil pump has slightly weaker sealing effect due to the influence of gear meshing clearance, and its volumetric efficiency is lower than that of the gerotor pump. Especially the leakage of the external meshing type is relatively more obvious.
Processing and cost
Gerotor pump: Its rotor tooth profile is a special cycloid, which has extremely high requirements on processing accuracy. Most of them need high-precision molds or special equipment for production. For example, small rotors often use powder metallurgy process, and the overall manufacturing cost is relatively high.
Gear oil pump: The gear tooth profile is mostly conventional involute, the processing technology is mature, and it can be produced on ordinary machine tools. The process difficulty is low, and the parts have strong versatility. Whether it is the initial manufacturing cost or the later maintenance and replacement cost, it is much lower than that of the gerotor pump.
Applicable scenarios
Gerotor pump: It is suitable for small flow, high precision or high speed working conditions. It is commonly used in automobile hydraulic power steering systems, engineering machinery pilot pumps, CNC machine tool lubrication systems, and also used in fully enclosed automatic lubrication systems of small equipment such as sewing machines.
Gear oil pump: Relying on the advantages of pollution resistance, low failure rate and stable pressure, it is widely used in scenarios where the requirements for accuracy and noise are not high, such as excavator auxiliary oil circuits, loader hydraulic systems, agricultural machinery and oil supply circuits of various small hydraulic equipment. It is a relatively versatile oil pump type.
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