HLA4V pump has the advantages of low noise, small size, good self-priming ability and high reliability. When applied in a closed system, when the oil pump variable crosses the zero position, the general plunger pump has a tray phenomenon. Only the HLA4V pump can effectively solve this problem, because the charge pump and the control pump can be connected in series, and the control valve can be integrated on the pump cover , Its structure is very compact; in addition, the proportional pumps are equipped with a closed feedback loop of displacement sensors, and its zero control accuracy is very high.
Widely used in: metallurgical industry, forging industry, shipbuilding industry, military ships, etc.
HLA4V series specifications produced by Hengli are 40, 71, 125, 180, 250, 500:; variable forms include constant pressure, constant power, hydraulic, load sensing, proportional, servo, pressure and flow compound control forms; there are open systems Pumps and closed system pumps.
1. Product Features
a, swash plate axial piston pump variable pump b, the flow of the hydraulic pump is proportional to the speed and displacement of the pump c, stepless variable can be realized by adjusting the angle of the swash plate d, the rated working pressure can reach 35MPa e. Excellent suction characteristics, selection of long life, high-precision bearings f, compact structure design, light weight, low noise characteristics g, static pressure balance shoes to improve service life h, sensitive control response, with swash plate angle indicator
2. Specification calculation
Output flow: Q=Vg.n.ηv/1000 L/min
Torque: M=1.59Vg.△P/10ηmh N.m
Power: P=M.n/9549=Q. △P/60ηt kW
Note: Vg=displacement mL/r △P=pressure difference MPa n=speed rpm
ηv = volumetric efficiency ηmh = mechanical efficiency ηt = point efficiency
Three, technical data
Performance parameters [The following data does not consider mechanical efficiency and volumetric efficiency]
| specification | HLA4VSO180DR |
| Displacement Vgmax(cm3/r) | 180 |
| Maximum speed nmax(rpm) |
| 1800 |
| Maximum flow (L/min) | When n=nmax | 324 |
| When n=1500rpm | 270 |
| Maximum power (KW) | When n=nmax | 189 |
| When n=1500rpm | 158 |
| Maximum torque△P=35MPa(Nm) | 1002 |
| Torque△P=10MPa(Nm) | 286 |
| Weight [approximate value] (Kg) | 103 |
Note: 1) As long as there is an absolute pressure of 0.1 MPa at the suction S, the value shown is valid.
Hydraulic pump working pressure range
S port [oil inlet] absolute pressure Ps min=0.08MPa Ps max=3 MPa
Pressure at B port [outlet port] Rated pressure P=35MPa Peak pressure=40 MPa
Precautions:
- a. During trial operation, the pump body must be filled with oil and kept full during work.
- b. In order to reduce noise, all connecting pipes are recommended to be isolated from the fuel tank with flexible components.
- c. The leaking pipeline needs to be directly returned to the oil tank, and the drain pressure (the highest pressure allowed in the shell) is 0.4 MPa (absolute pressure).
- d. During vertical installation, bearing flushing is recommended to ensure adequate lubrication of the front bearing and shaft seal. This can be done by the oil port U close to the front flange of the variable pump. The flushing oil flows through the front bearing and is discharged from the leaking oil port together with the leaking oil of the pump. U port and leakage oil port T maintain a pressure difference of about 0.2 MPa. Flushing oil flow required by various specifications of pumps
See table below
| specification | 40 | 71 | 125 | 180 | 250 | 355 | 500 |
| Flow L/min | 4 | 5 | 6 | 8 | 12 | 16 | 20 |
e. When the hydraulic pump is continuously running at rated pressure or intermittent peak pressure, use auxiliary devices to cool the oil to ensure that the oil temperature does not exceed the specified range.
Fourth, hydraulic pump implementation standards
JB/T7043-2006 hydraulic pump axial piston pump
