German DEPA pump DEPA model DEPA price

DEPA pump is a typical positive displacement hydraulic machine, driven by a prime mover, converting input mechanical energy into pressure energy of the liquid, and then inputting it into the system in the form of pressure and flow. It is the power source of the hydraulic system. Since it can transport liquids under high pressure, it is widely used in various industries in industrial production and daily life, such as water conservancy, construction, and energy. In addition, it is also widely used in shipbuilding, oil extraction, and loaders.

DEPA pump operating mode

During operation, under the action of the cam on the fuel injection pump camshaft and the plunger spring, the plunger is forced to perform reciprocating up-and-down motion, thereby completing the fuel pumping task. The fuel pumping process can be divided into the following three stages. Conclusion: Through the above discussion, the following conclusions are drawn: (1) The total stroke L of the plunger reciprocating motion is constant, determined by the cam lift. (2) The fuel supply volume per plunger cycle depends on the fuel supply stroke; the fuel supply stroke is not controlled by the camshaft and is variable. (3) The start timing of fuel supply does not change with changes in the fuel supply stroke. (4) Rotating the plunger can change the end timing of fuel supply, thereby changing 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, III. Serialization is based on different fuel supply requirements according to 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, to meet the needs of various diesel engines. The working principle and structural type of domestic series fuel injection pumps are basically the same. Taking the A type pump as an example, the structure and working principle of the plunger-type fuel injection pump are introduced. The plunger pump consists of four main parts: pumping element, fuel quantity adjustment mechanism, drive mechanism, and pump body. It features microprocessor intelligent control, LCD display, and communication with computers, with characteristics such as stable working pressure, low pulsation, and convenient operation. It is widely used in biochemistry, pharmaceuticals, chemical industry, environmental protection, and other industries, meeting the requirements of these industries for continuous constant-pressure and constant-flow liquid transportation.

DEPA pump mechanical principle

The total stroke L of the reciprocating motion of the plunger in a plunger pump is constant and determined by the cam lift. The fuel delivery volume per cycle depends on the delivery stroke; the delivery stroke is variable and not controlled by the camshaft. The start of fuel delivery does not change with variations in the delivery stroke. Rotating the plunger changes the end of fuel delivery, thereby altering the fuel delivery volume. During operation of the plunger pump, the cam on the injection pump camshaft and the plunger spring force the plunger to perform reciprocating up-and-down motion, thus completing the pumping task. The pumping process can be divided into the following two stages: 1) Intake process: After the lobe of the cam rotates past, the plunger moves downward under the force of the spring, creating a vacuum in the upper space of the plunger (called the pumping chamber). When the upper end face of the plunger opens the inlet port on the plunger sleeve, diesel fuel filling the oil passage in the upper body of the oil pump enters the pumping chamber through the port. The intake ends when the plunger reaches bottom dead center. 2) Return process: The plunger moves upward to deliver fuel. When the helical groove (cut-off edge) on the plunger aligns with the return port on the sleeve, the low-pressure oil circuit in the pumping chamber communicates with the central hole, radial holes, and helical groove at the plunger head. Oil pressure drops suddenly, and the delivery valve closes rapidly under spring force, stopping fuel delivery. The plunger continues to move upward; after the lobe of the cam rotates past, the plunger moves downward again under the action of the spring. This begins the next cycle. The plunger pump is described using a single plunger as an example. A plunger pump has two check valves with opposite orientations. When the plunger moves in one direction, negative pressure occurs in the cylinder, opening one check valve and drawing liquid into the cylinder. When the plunger moves in the other direction, the liquid is compressed, opening the other check valve and discharging the liquid drawn into the cylinder. This operating mode results in continuous fuel delivery during continuous motion.

DEPA pump maintenance

(1) Check the plunger for scratches and corrosion; replace with new parts if necessary. (2) Check the fit of the plunger pair. Insert the plunger end into the plunger sleeve and tilt it approximately 60°. If the plunger can slowly slide down under its own weight, the fit is good. (3) Check the sealing of the plunger pair. Hold the plunger sleeve with one hand, blocking the top and side inlet ports of the plunger 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 pair sealing is good; otherwise, replace the plunger pair. (4) Check the decompression band of the delivery valve pair for wear, steps, or scratches; replace if necessary. (5) Check the fit of the delivery valve pair. 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 pair sealing is good; otherwise, replace the delivery valve pair. (6) Check the tappet body. The standard clearance between the fuel injection pump body and the tappet body is 0～0.03mm. 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 0.02～0.08mm. If it exceeds 0.12mm, the control sleeve must be replaced.

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