Plunger pump pressure, no pressure, hydraulic plunger pump plunger pump pressure couldn't get on

Plunger pump is an important power components, hydraulic systems rely on the plunger reciprocating motion in the cylinder, the volume of the sealing work chamber should change to realize oil absorption, oil pressure, high pressure rated, compact structure, high efficiency and convenient flow control, are widely used in high pressure, big flow and flow need adjustment occasions, such as hydraulic press, engineering machinery and ship. Plunger pump for a long time, in use process may appear slow execution component, pressure build up or couldn't get on, what is the cause of this phenomenon?

no, plunger pump pressure build up or output pressure is insufficient, generally has the following several reasons:

1, the suction filter clogging

road 2, hydraulic oil tank oil level is too low,

4 3, suction pipe leakage, plunger pump center spring break, packing or fatigue, make the piston can not return, the other end of the cylinder block can not be the top in the oil distribution disc

5, oil distribution on the interface between the plate and cylinder injury is serious, do not seal or cylinder block and oil distribution plate of initial seal is bad

6, plunger diameter and cylinder hole between wear

7, severe oil

8, drive power is too small,

9, variable R Angle is too small, the traffic is too small, and leakage, and thus can't continuous foreign supply pressure oil

10, for pressure compensation variable pump, the control variable mechanism of the spring line is too loose, so when the pressure rises, the swash plate Angle is small, quickly then flow also drops rapidly to the low value, pressure is not easy to build.

second, the source of hydraulic piston pump pressure can't adjust to the system work

check steps 1, close the oil suction mouth ball valve

2, open the oil filter cover, check whether the filter is clogged or damaged

3, remove the pressure compensation adjusting mechanism of the hair core, springs, cleaning

4, tear down Allen plug, tong oil duct with compressed air blowing off

3, plunger pump pressure couldn't get on the troubleshooting steps of

1, check the oil distribution plate and cylinder joint surface ( G1 and G2 side) Contact situation between

when two surface dirt to enter, joint surface roughening and pull a shallow groove, the pressure within the oil absorption cavity between the leakage, the greater the pressure, the higher the internal leakage, should clean decontamination, and will have hair, repair;

2, check the hole between the piston and cylinder with

two sliding mating surface wear or strain into axial groove, Φ plunger diameter d and the fitting clearance between the cylinder body hole Φ d increases, oil pressure through the clearance leakage into the pump body cavity output flow is not enough. Can brush plating column round Φ d, change the plunger, beyond the Great Wall or the piston and cylinder research with the method of repair. Ensure that the gap between them within the prescribed scope ( Φ D with general is 25 ~ 26 microns) ;

3, check the oil absorption resistance axial plunger pump, although has certain self ability, but if the suction pipe passing and bend too much long, oil suction height is too high, > 500毫米) Causes such as oil suction channel of partial loss of ut, the plunger pump oil absorption is difficult, partly empty absorption, causing the output flow rate was not enough. Besides, plunger pump is strictly forbidden to install any oil filter on suction tubing, otherwise he can cause fluid type hydraulic pump is different. At this time in order to solve the possibility of plunger pump suction dirt, can be in the tank suction tubing the surroundings of a large space, with mesh around closed up, is the same as the effect is. For flow is greater than 160 l/lnin plunger pump, officer USES flow backward imbibition.

4, check after repairing and reassemble correctly

after repairing to assembly, if the oil distribution disc hole of the positioning pin is installed on the pump cover, and against each other, can't make the oil distribution plate and cylinder block, caused the high and low pressure oil sub

5, each check whether oil pump center spring break or fatigue

6, fastening screws not pressure, radial force cause skew cylinder body, cylinder body between the cylinder block and oil distribution disc wedge clearance, internal leakage, and produce enough output flow, thus fastening gradually tightened.

7, the oil temperature is too high, while the internal leakage of the pump output flow is not enough, should try to reduce the oil temperature.

8, suction pipe line bare pipe fittings not tighten or untight seal in the atmosphere, air intake; Or into the pipe burst and atmosphere are interlinked, or not weld welds. This difficulty in the pump form mutually) , within the water pump oil absorption cavity equals the atmospheric pressure with the outside world close to impossible to pressure oil into the pump.

9, for by the auxiliary fuel supply pump plunger pump, auxiliary pump may be entered into the guinness LeZhu pump main pump enough oil, pump capacity is not enough or pressure couldn't get on

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