The triplex piston pump is a hydraulic pump that can change the oil volume and pressure through the reciprocating motion of the piston in the cylinder. Its advantages are: high pressure, compact structure, high efficiency, and convenient flow adjustment. This system is mainly used in situations where high pressure and large flow are required, and high power and flow need to be adjusted, such as: broaching machines, hydraulic presses, engineering machinery, mining machinery, metallurgical machinery, ships, etc.

Three-cylinder plunger pump technical parameters:

The parameters designed for the triplex piston pump include plunger diameter, output per stroke, pump strokes per minute, and pinion speed. The following is a specific performance parameter table:

Three-cylinder plunger pump structure:

The oil pumping mechanism of the triplex plunger pump includes two sets of precision coupling parts: the plunger + plunger sleeve constitute the plunger coupling, and the oil delivery valve and oil delivery valve seat constitute the oil delivery valve coupling. The plunger and plunger sleeve are a pair of precision parts that cannot be interchanged after pairing and grinding. They require high precision, smoothness and good wear resistance. Their radial clearance is 0.002~0.003mm. The oil delivery valve and the oil delivery valve seat are also a pair of precision parts. They cannot be interchanged after matching and grinding. Their matching gap is 0.01mm.

Remarks: 1-gear 2-drive shaft 3-output port 4-casing 5-oil inlet 6-left oil pump 7-swash plate 8-drive shaft 9-gear 10-plate 11-retainer 12-piston slider 13-pin 14-piston 15-neutral pressure port closed 16-pilot pump 17-channel 18-orifice plate 19-cylinder barrel

Working principle of three-cylinder plunger pump:

During operation, under the action of the cam on the camshaft of the fuel injection pump and the plunger spring, the plunger is forced to reciprocate up and down to complete the oil pumping task. The oil pumping process can be divided into the following three stages.

1. Oil feeding process

When the convex part of the cam turns over, the plunger moves downward under the action of the spring force, and a vacuum is generated in the upper space of the plunger (called the pump oil chamber). When the upper end surface of the plunger opens the oil inlet hole on the plunger sleeve, the diesel oil filled in the oil passage of the upper body of the oil pump enters the pump oil chamber through the oil hole. The plunger moves to the bottom dead center, and the oil inlet is completed.

2. Oil supply process

When the camshaft rotates and the convex part of the cam pushes up the roller body, the plunger spring is compressed, the plunger moves upward, the fuel is pressurized, and part of the fuel flows back to the upper body oil chamber of the fuel injection pump through the oil hole. When the top surface of the plunger covers the upper edge of the oil inlet hole on the sleeve, because the matching gap between the plunger and the sleeve is very small (0.0015-0.0025mm), the pump oil chamber at the top of the plunger becomes a sealed oil chamber. The plunger continues to rise, and the oil pressure in the pump oil chamber rises rapidly. When the pump oil pressure > the spring force of the oil outlet valve + the residual pressure of the high-pressure oil pipe, the oil outlet valve is pushed open, and the high-pressure diesel enters the high-pressure oil pipe through the oil outlet valve and is injected into the combustion chamber through the injector.

3. Oil return process

The plunger supplies oil upward. When the chute (stop side) on the plunger communicates with the oil return hole on the sleeve, the low-pressure oil circuit in the pump oil chamber communicates with the middle hole and radial hole of the plunger head and the chute. The oil pressure suddenly drops, and the oil outlet valve closes quickly under the action of the spring force, stopping oil supply. After that, the plunger will go up again. When the convex part of the cam turns over, the plunger will go down again under the action of the spring. At this point the next cycle begins.

Triplex plunger pump features:

1. The pump reducer can have 17 installation positions, making it adaptable to different drive circuits of the pump unit.

2. Two different pump head bodies to match different sizes of plungers (due to different pressure and displacement requirements).

3. Packing components, valve assemblies, discharge flanges, suction manifolds, etc. can be selected arbitrarily to adapt to and meet the requirements of different layouts, different media, and different environments.

4. The pump has a light and simple structure, reduced weight, largest displacement and highest pressure.

Triplex plunger pump applications:

The triple-cylinder plunger pump is suitable for use as a process pump in the petroleum, chemical and fertilizer industries, high-pressure water descaling in metallurgy, steel rolling mills, construction, shipbuilding, sugar, paper, chemical and other industries. The main uses are as follows:

● High-pressure water cleaning and descaling

● Oilfield water injection

● Boiler feed water

●Power source of hydraulic machinery

● Food, pharmaceuticals, etc. need to produce high-pressure liquids