German DELLMECO pump DELLMECO model DELLMECO price

DELLMECO pumps are an important component in hydraulic systems. They rely on the reciprocating motion of plungers within the cylinder block to change the volume of the sealed working chamber, thereby achieving oil suction and discharge. Plunger pumps offer advantages such as high rated pressure, compact structure, high efficiency, and convenient flow regulation. Plunger pumps are widely used in applications requiring high pressure, large flow rates, and flow adjustment, such as hydraulic presses, construction machinery, and ships.

DELLMECO pump configurations

Plunger pumps are divided into two representative structural types: axial plunger pumps and radial plunger pumps. Since radial plunger pumps are a new type of high-efficiency pump with high technological content, with the accelerating pace of localization, radial plunger pumps will inevitably become an important part of the plunger pump application field. A radial plunger pump is a plunger pump in which the reciprocating motion direction of the piston or plunger is perpendicular to the drive shaft. Radial plunger pump working principle: Drive torque is transmitted from the drive shaft via a cross coupling to the star-shaped hydraulic cylinder rotor; the stator is not subjected to other lateral forces. The rotor is mounted on the distribution shaft. The radially arranged plungers located in the rotor press tightly against the eccentric stroke stator via hydrostatically balanced slippers. The plunger is connected to the slipper by a ball joint and locked with a retaining ring. Two retaining rings hold the slippers against the stroke stator. When the pump rotates, it presses against the inner surface of the stator relying on centrifugal force and hydraulic pressure. As the rotor turns, due to the eccentricity of the stator, the plunger performs reciprocating motion, with its stroke being 2 times the stator eccentricity. The stator's eccentricity can be adjusted by two plungers positioned radially opposite each other on the pump body. Oil inlet and outlet occur through channels in the pump body and distribution shaft, controlled by the suction port on the distribution shaft. Hydraulic pressure generated within the pump body is absorbed by the hydrostatically balanced surfaces. The hydrostatic balance of the friction pair adopts an over-balance pressure compensation method, forming open-loop control. The bearings supporting the drive shaft serve only a supporting role and are not subject to other external forces. In hydraulic systems: Axial plunger pumps operate by utilizing the volume change produced by the reciprocating motion of plungers parallel to the transmission axis within the plunger bores. Since both the plunger and the plunger bore are circular parts, they can achieve very high precision fits during machining.

DELLMECO pump classification

Plunger pumps are generally classified into single plunger pumps, horizontal plunger pumps, axial plunger pumps, and radial plunger pumps. 1) Single plunger pump: The main structural components include an eccentric wheel, plunger, spring, cylinder block, and two check valves. A sealed volume is formed between the plunger and the cylinder bore. One rotation of the eccentric wheel causes the plunger to reciprocate once; downward motion sucks oil, and upward motion discharges oil. The volume of oil discharged per revolution of the pump is called displacement, which depends only on the pump's structural parameters. 2) Horizontal plunger pump: Horizontal plunger pumps consist of several plungers (generally 3 or 6) installed in parallel. They use 1 crankshaft(s) to drive the plungers in reciprocating motion via connecting rod sliders or directly via an eccentric shaft, achieving liquid suction and discharge. They also adopt valve-type distribution devices and are mostly fixed-displacement pumps. Emulsion pumps in coal mine hydraulic support systems are generally horizontal plunger pumps. Emulsion pumps are used at coal mining faces to provide emulsion for hydraulic supports. Their working principle relies on the rotation of the crankshaft to drive the Piston pump in reciprocating motion, achieving liquid suction and discharge. 3) Axial type: Axial plunger pumps (English name: Piston pump) are plunger pumps in which the reciprocating motion direction of the piston or plunger is parallel to the central axis of the cylinder block. Axial plunger pumps operate by utilizing the volume change produced by the reciprocating motion of plungers parallel to the transmission axis within the plunger bores. Since both the plunger and the plunger bore are circular parts, they can achieve very high precision fits, resulting in high volumetric efficiency. 4) Straight-axis swashplate type: Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply hydraulic pumps mostly use pressurized tanks. For hydraulic tanks relying on air pressure for supply, the machine must only be operated after the hydraulic tank reaches the required operating pressure following each startup. If the machine is started when the hydraulic tank pressure is insufficient, it will cause the slippers inside the hydraulic pump to detach, leading to abnormal wear between the return plate and the pressure plate inside the pump body. 5) Radial type: Radial plunger pumps can be divided into two categories: valve distribution and shaft distribution. Valve-distribution radial plunger pumps have disadvantages such as high failure rates and low efficiency. Shaft-distribution radial plunger pumps developed internationally in the 70s and 80s overcame the shortcomings of valve-distribution radial plunger pumps. Due to the structural characteristics of radial pumps, shaft-distribution radial plunger pumps are more impact-resistant, have longer service lives, and offer higher control precision than axial plunger pumps. Variable displacement in short-stroke variable pumps is achieved by changing the stator eccentricity under the action of the variable plunger and limit plunger. The maximum stator eccentricity is 5–9mm (depending on displacement size), resulting in a very short variable stroke. Furthermore, the variable mechanism is designed for high-pressure operation and controlled by a control valve, giving the pump a fast response speed. The radial structural design overcomes problems such as uneven slipper wear found in axial plunger pumps, significantly improving impact resistance. 6) Hydraulic type: Hydraulic plunger pumps using pressurized hydraulic tanks require waiting for the hydraulic tank to reach operating pressure before operating the machine after each startup. Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply hydraulic pumps mostly use pressurized tanks, while some hydraulic pumps have a built-in charge pump to supply pressure oil to the hydraulic pump inlet. Self-priming hydraulic pumps have strong self-priming capabilities and do not require external oil supply.

DELLMECO pump maintenance

When using a gear pump, wear of the gear pump is unavoidable, therefore many problems will arise, so it is necessary to learn the most common maintenance techniques for gear pumps. This enables accurate diagnosis when problems occur. Routine maintenance techniques are as follows: 1) Maintenance of the working surface: If the wear on the pump cover working surface is slight, you can manually eliminate the wear marks by lapping, that is, place a small amount of valve grinding compound on a surface plate or thick glass plate, then place the pump cover on top and lap it, until the wear marks are removed and the working surface is flat. If the wear depth on the working surface of the pump cover exceeds zero point one millimeter, it must be repaired by turning first and then lapping. 2) Maintenance of the drive shaft bushing bore: The repair method for wear of the drive shaft bushing bore on the pump cover is the same as that for wear of the drive shaft bushing bore in the housing. Repair of the pump housing bore: After the pump housing bore is worn, the bore lining method is adopted for repair, which involves boring out the bore and fitting a cast iron or steel liner. After lining, bore the inner cavity to the required dimensions, and grind off the liner protruding from the end face so that it is flush with the pump housing mating surface. 3) Maintenance of the valve seat: Pressure relief valves come in two types: ball valve and plunger valve. After the ball valve seat is worn, place a steel ball on the valve seat, then gently tap the steel ball with a metal rod, until the ball valve seats tightly against the valve seat. If the valve seat is severely worn, ream to remove the wear marks, and then use the above method to achieve a tight seal. After the plunger-type valve seat wears out, a small amount of valve grinding compound can be added for lapping, lapping until a tight seal is achieved. The above describes some of the most basic maintenance procedures for components of gear pumps. During application, other different problems may also be encountered. These different problems must be carefully investigated to identify their causes.

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