German casappa pump casappa model casappa price

casappa pumps are also known as positive displacement devices. Like a piston in a cylinder, when one gear tooth enters the fluid space of another, the liquid and the tooth cannot occupy the same space simultaneously because the liquid is incompressible. Thus, the liquid is mechanically squeezed out. Due to the continuous meshing of the teeth, this phenomenon occurs continuously, providing a continuous discharge volume at the pump outlet. The discharged volume is the same for each revolution of the pump. As the drive shaft rotates continuously, the pump discharges fluid without interruption. The pump flow rate is directly related to the pump speed.

casappa pump drive unit

The gear pump is driven by an independent motor, which can effectively block upstream pressure pulsations and flow fluctuations. The pressure pulsation at the gear pump outlet can be controlled within 1%. Using a gear pump on an extrusion production line can increase the flow output speed and reduce the shear and residence time of materials in the extruder. External gear pumps are the most widely used type of gear pump; generally, the term 'gear pump' refers to external gear pumps. Its structure is shown in Figure 5-14, mainly consisting of a driving gear, driven gear, pump body, pump cover, and safety valve. The sealed space formed by the pump body, pump cover, and gears constitutes the working chamber of the gear pump. The shafts of the two gears are mounted in bearing holes on the two pump covers, with the driving gear shaft extending out of the pump body to be rotated by the motor. External gear pumps feature simple structure, light weight, low cost, reliable operation, and wide application range. During operation, the driving gear rotates with the motor and drives the driven gear to rotate. As the meshing teeth on the suction side gradually separate, the volume of the suction chamber increases, pressure decreases, and liquid from the suction pipe is drawn into the pump. The sucked liquid is pushed by the gears in the tooth spaces along two paths into the discharge chamber. After entering the discharge chamber, the liquid is squeezed by the continuous meshing of the two gear teeth and flows from the discharge chamber into the discharge pipe. As the driving and driven gears rotate continuously, the pump continuously sucks in and discharges liquid. A safety valve is installed on the pump body; when the discharge pressure exceeds the specified pressure, the conveyed liquid automatically opens the safety valve, allowing high-pressure liquid to return to the suction pipe. Internal gear pumps consist of a pair of mutually meshing internal gears, a crescent-shaped piece between them, and a pump housing. The crescent-shaped piece separates the suction chamber from the discharge chamber. When the driving gear rotates, a partial vacuum is formed where the gears disengage, drawing liquid into the pump to fill the spaces between the teeth in the suction chamber. The liquid then enters the discharge chamber along the inner and outer sides of the crescent-shaped piece via two paths. Where the teeth engage, the liquid between the teeth is squeezed and sent into the discharge pipe. In addition to self-priming capability and flow rate independent of discharge pressure, gear pumps have no suction or discharge valves on the pump housing, offering simple structure, uniform flow, and reliable operation. However, they have low efficiency, high noise and vibration, and are prone to wear. They are mainly used to convey various oils that are non-corrosive, free of solid particles, and have lubricating properties, such as lubricating oil and edible vegetable oil. The temperature generally does not exceed 70 ℃. The general flow range is 0.045–30ms/h, the pressure range is 0.7–20MPa, and the operating speed is 1200–4000r/min.

casappa pump structural forms

Piston pumps are divided into two representative structural forms: axial piston pumps and radial piston pumps. As radial piston pumps are a new type of high-efficiency pump with high technical content, and with the acceleration of localization, radial piston pumps will inevitably become an important part of the piston pump application field. A radial piston pump is a piston pump in which the reciprocating motion direction of the pistons or plungers is perpendicular to the drive shaft. Radial piston 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 pistons located in the rotor press against the eccentric stroke stator via hydrostatically balanced slippers. The pistons are connected to the slippers by ball joints and locked by snap rings. 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 pistons perform reciprocating motion, with their stroke being 3 times the stator eccentricity. The stator eccentricity can be adjusted by two pistons located at opposite radial positions 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. The hydraulic pressure generated in the pump body is absorbed by the hydrostatically balanced surfaces. The hydrostatic balance of the friction pairs adopts an over-balance pressure compensation method, forming open-loop control. The bearings supporting the drive shaft only provide support and are not subject to other external forces. In hydraulic systems: Axial piston pumps operate by utilizing volume changes produced by the reciprocating motion of pistons parallel to the transmission shaft within piston bores. Since the pistons and piston bores of piston pumps are circular parts, high-precision fits can be achieved during machining.

casappa pump features and maintenance

Advantages: Simple and compact structure, small size, light weight, good manufacturability, low price, strong self-priming ability, insensitivity to oil contamination, wide speed range, ability to withstand shock loads, easy maintenance, and reliable operation. Disadvantages: Unbalanced radial forces, large flow pulsation, high noise, low efficiency, poor interchangeability of parts, difficulty in repair after wear, and inability to function as variable displacement pumps. 1) Trapped oil phenomenon. Cause: During the operation of involute gear pumps, the closed volume at the gear intersection changes with time, often sealing a portion of the hydraulic oil between the teeth, as shown in the figure. This is called the trapped oil phenomenon. Since hydraulic oil is incompressible, it causes significant vibration and noise in the external gears, affecting normal system operation. Measure: Cut relief grooves on the front and rear covers or floating bushings. The principle for cutting relief grooves is: the distance between the two grooves corresponds to the minimum closed volume, connecting the closed volume to the pressure chamber when it decreases from large to small, and to the suction chamber when it increases from small to large. 2) Leakage phenomenon. Gear pumps have relatively large leakage. During the operation of external gear pumps, leakage paths are mainly three: gear tip clearance, side clearance, and meshing clearance. Among these, end face side clearance leakage is significant, accounting for 80%–85% of the total leakage. When pressure increases, the former does not change, but the deflection of the latter increases significantly. This is the main cause of leakage in external gear pumps, resulting in lower volumetric efficiency, making them unsuitable as high-pressure pumps. Solution: End face clearance compensation uses hydrostatic balance measures, adding a compensation part between the gear and the cover, such as a floating bushing or floating side plate. 3) Unbalanced force phenomenon. The right side is the pressure chamber, and the left side is the suction chamber; the pressures in the two chambers are unbalanced. Additionally, due to tip leakage in the pressure chamber, its pressure decreases progressively. These two unbalanced pressures acting on the gears and shafts are called radial unbalanced pressures. The higher the oil pressure, the greater this force, accelerating bearing wear, reducing bearing life, causing shaft bending, and increasing wear between the gear tips and shaft holes. Prevention measures: Use pressure balance grooves or reduce the size of the pressure chamber.

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