German gardena pump gardena model gardena price

gardena pumps are rotary pumps that transport liquids or increase their pressure by relying on the change and movement of the working volume formed between the pump cylinder and meshing gears. Two enclosed spaces are formed by two gears, the pump body, and the front and rear covers. When the gears rotate, the volume on the disengaging side increases from small to large, creating a vacuum that draws in liquid, while the volume on the meshing side decreases from large to small, forcing the liquid into the pipeline. The suction chamber and discharge chamber are separated by the meshing line of the two gears. The pressure at the discharge port of a gear pump depends entirely on the magnitude of the resistance at the pump outlet.

gardena pump operating principle

The concept of a gear pump is very simple; its most basic form consists of two gears of identical size meshing and rotating within a closely fitted housing. The interior of this housing resembles an "8" shape, with the two gears installed inside, and the outer diameter and sides of the gears closely fitting the housing. Material from the extruder enters between the two gears at the suction inlet, filling this space, moves along the housing as the teeth rotate, and is finally discharged when the teeth mesh. Gear pumps are also known as positive displacement devices; similar to a piston in a cylinder, when one tooth enters the fluid space of another tooth, the liquid and the tooth cannot occupy the same space simultaneously because the liquid is incompressible, so 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. With each revolution of the pump, the discharged volume is the same. As the drive shaft rotates uninterrupted, the pump continuously discharges fluid. The pump flow rate is directly related to the pump speed. In practice, there is a small amount of fluid loss within the pump because this fluid is used to lubricate the bearings and the sides of the gears, and the pump body cannot have a gap-free fit, so it is impossible for the fluid to exit the outlet 100%. Therefore, a small amount of fluid loss is inevitable, preventing the pump's operating efficiency from reaching 100%. However, the pump can still operate well, and for most extruded materials, it can achieve an efficiency of 93% to 98%. This type of pump is not significantly affected by fluids whose viscosity or density changes during the process. If there is a damper, such as a filter screen or a restrictor placed on the discharge side, the pump will push the fluid through them. If this damper changes during operation—i.e., if the filter becomes dirty or clogged, or if the back pressure of the restrictor increases—the pump will maintain a constant flow until the mechanical limit of the weakest component in the system is reached (a torque limiter is usually installed). There is actually a limit to the speed of a pump, which mainly depends on the process fluid. If oil is being transported, the pump can rotate at high speeds, but this limit increases significantly when the fluid is a high-viscosity polymer melt. It is crucial to fill the space between the two teeth on the suction inlet side with high-viscosity fluid; if this space is not fully filled, the pump cannot discharge an accurate flow rate. Therefore, the PV value (pressure × flow velocity) is another limiting factor and a process variable. Due to these limitations, gear pump manufacturers offer a range of products with different specifications and displacements (volume discharged per revolution). These pumps are matched to specific application processes to optimize system capacity and price.

gardena pump drive unit

During operation, under the action of the cam on the fuel injection pump camshaft and the plunger spring, the plunger is forced to reciprocate up and down, thereby completing the fuel pumping task. The fuel pumping process can be divided into the following three stages. Conclusion: From the above discussion, the following conclusions are drawn: (1) The total stroke L of the plunger's reciprocating motion is constant and determined by the cam lift. (2) The fuel supply volume per plunger cycle depends on the fuel supply stroke, which is variable and not controlled by the camshaft. (3) The start time of fuel supply does not change with variations in the fuel supply stroke. (4) Rotating the plunger can change the end time of fuel supply, thereby altering the fuel supply volume. 3 Domestic series plunger-type fuel injection pumps: Domestic series plunger pumps mainly include A, B, P, Z, and Series I, II, and III. Standardization is based on the different fuel supply requirements for the single-cylinder power range of diesel engines, using plunger stroke, pump cylinder center distance, and structural type as the basis, combined with plunger diameters of different sizes to form several types of fuel injection pumps with unequal fuel supply volumes within one working cycle, meeting the needs of various diesel engines. The operating principles and structural types of domestic series fuel injection pumps are basically the same. Taking the A type pump as an example, the structure and operating principle of plunger-type fuel injection pumps are introduced. The plunger pump consists of four main parts: the pumping element, the fuel quantity adjustment mechanism, the transmission mechanism, and the pump body. It features microprocessor intelligent control, LCD display, and communication with computers, offering characteristics such as stable working pressure, low pulsation, and ease of operation. It is widely used in biochemistry, pharmaceuticals, chemical industry, environmental protection, and other industries, meeting the requirements for continuous constant-pressure and constant-flow liquid transportation in these sectors.

gardena pump maintenance and overhaul

(1) Inspect the plunger for scratches and corrosion; replace with new parts if necessary. (2) Check the fit of the plunger assembly. Insert the plunger end into the plunger sleeve and tilt it approximately 60°; if the plunger slides down slowly under its own weight, the fit is good. (3) Check the sealing of the plunger assembly. Hold the plunger sleeve with one hand, blocking the plunger top and the side oil inlet with two fingers. Pull out the plunger with the other hand; if significant suction is felt and the plunger immediately retracts to its original position upon release, the plunger assembly sealing is good; otherwise, replace the plunger assembly. (4) Inspect the decompression band of the delivery valve assembly for wear, steps, or scratches; replace if necessary. (5) Check the fit of the delivery valve assembly. Block the lower hole of the delivery valve with one finger and gently press the delivery valve downward with another finger. When the finger leaves the top of the delivery valve, if it automatically springs back to its original position, the delivery valve assembly sealing is good; otherwise, replace the delivery valve assembly. (6) Inspect the tappet body. The standard clearance between the fuel injection pump body and the tappet body is 0 to 0.03mm; if it exceeds 0.2mm, replace the parts. (7) Check the clearance between the plunger flange and the groove of the control sleeve, which should be 0.02 to 0.08mm; if it exceeds 0.12mm, the control sleeve must be replaced.

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