VG Series Gear Pump

VG series gear pumps are developed by our company and American Albert Fluid Power Co., LTD. (Ningbo NVICKS Hydraulic Co.,LTD., a wholly owned subsidiary; short for ABT) , cooperated with Zhejiang University . They're high performance internal gear pumps. The technology on the basis of the introduction of Germany to be improved,and we introduced a number of foreign advanced production and testing equipments, to make a pump of high pressure, low noise and low pulse.
Our company has independent intellectual property rights and National Innovation Fund support, widely used in rubber and plastic, die casting, shoe leather, forging, extrusion, bending, plate Shearing machinery and other servo hydraulic system.

● Adopting axial and radial pressure compensation design to maintain high volumetric efficiency even at low speed and low viscosity. Ultra-low noise, using high-strength cast iron and a unique internal noise reduction design, make the noise lower.

● Very low flow and pressure pulsation, stable flow and pressure output can still be maintained at low speeds. High pressure design, the maximum working pressure can reach 35MPa

● Wide speed range, the highest speed can reach 3000r/min Can be combined arbitrarily to form a double pump.

● Can be combined arbitrarily to form a double pump.

● It is not sensitive to oil pollution and has a long service life.

● It can be widely applied to hydraulic systems in industries such as plastic machines, shoe machines, die-casting machinery and forklifts, and is especially suitable for energy-saving systems driven by servo inverters.

Principle Diagram of Gear Pump

The VG hydraulic pump is a backlash compensation internal gear pump with a fixed displacement.
Its basic structure is: install front cover (1), pump body (2), rear cover (3), outer gear shaft (4), inner gear ring (5), sliding bearing (6), oil distribution plate (7) And positioning rod (8), and consist of crescent sub-board (9), crescent main board (10) and sealing rod (11)

Suction and discharge process

The external gear shaft (4) installed according to fluid dynamics drives the internal gear ring (5) in the direction of rotation shown. Fill the oil through the tooth gap opened in the oil suction area. The oil is transported from the oil suction area (S) to the pressure area (P) through the side clearance between the outer gear shaft and the inner gear ring. As a result, the oil is discharged from the closed tooth gap and delivered to the pressure oil port (P). The oil suction area and the discharge area are separated by the radial compensation element (9 to 11) and the gear mesh between the inner ring gear and the outer gear.

Axial compensation

The discharge chamber in the pressure zone is axially sealed by the oil distribution plate (7). The oil distribution pan faces away from the discharge area one side is back pressured by the pressure field (12). These pressure fields make the oil distribution plate and the discharge area reach a balance, from the ideal sealing effect is achieved with lower mechanical loss.

Radial compensation

The radial compensation element includes a crescent sub-plate (9), a crescent main plate (10) and a sealing rod (11). The crescent main plate (10) is closely attached to the round surface of the tooth tip of the outer gear shaft, the crescent sub-plate (9) is closely attached to the round surface of the tooth tip of the inner gear ring, and the positioning rod is used to restrict the movement of the crescent plate in the circumferential direction.
In this way, the pressure zone can be separated from the suction zone by automatic clearance adjustment. This is a prerequisite for maintaining high volumetric efficiency continuously throughout the working hours.

Toothing

The toothing with involute flanks features a long meshing length for low flow and pressure pulsation and therefore ensures lownoise operation.

Technical data If using is beyond the scope of the specified technical parameters, please be sure to consult Nvicks!

Overview

Design	Internal gear pump, clearance compensation
Connection type	SAE 2 standard flanges to ISO 3019-1
Pipeline connection	Oil Flange
Shaft load	Radial and axial forces only after adjustment (e.g., pulley)
Rotation direction (viewed from shaft end)	Clockwise or counterclockwise (available on request)- not bidirectional!

Hydraulic

Hydraulic oil		HLP- Mineral oil conforming to DIN 51524 Part 2 HFC- Waterborne polymer solutions in accordance with DIN EN ISO 12922 1) 2) : Sealing design W HEES- Hydraulic oils according to DIN ISO 15380 1) HFD-U- Hydraulic fluid in accordance with VDMA 243171), DIN EN ISO 12922 1)
Hydraulic oil	HLP °C hydraulic oil	- 10 to + 80; For other temperature, please consult us!
	°C Special hydraulic oil	- 10 to 50 +; For other temperatures, please consult us
°C Ambient temperature range		–20 to +60 –20 to +60
mm2/s Viscosity range		10 to 300（to n = 1800 min-1） 10 to 100（to n = 3000 min-1） 2000 Allowable starting viscosity (400 to 1800 min-1)
The maximum allowable contaminati on of hydraulic oil is in line with ISO Cleanliness grade of 4406 (c)		20/18/15 3） Grade 20/18/15 3)

1. Attention !
For these medium, restrictions on specific hydraulic oils may apply.
2. Hydraulic oil HFC: input speed n maximum =2000 min-1
3. The specified component cleanliness level must be followed in the hydraulic system. Effective filtration can avoid failures and extend the service life of the components.