German Interlit pump Interlit model Interlit price

Interlit 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.

Interlit pump working 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 the change of 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 fuel injection pumps Domestic series plunger pumps mainly include A, B, P, Z and Series I, II, III, etc. 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, and then matching with plunger diameters of different sizes to form several types of fuel injection pumps with unequal fuel supply volumes in 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 fuel injection pump are introduced. The plunger pump consists of four main parts: pumping unit, fuel quantity adjustment mechanism, transmission 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, pharmaceutical, chemical, environmental protection, and other industries, meeting the requirements of these industries for continuous constant-pressure and constant-flow liquid transportation.

Interlit pump classification

Plunger pumps are generally divided into single plunger pumps, horizontal plunger pumps, axial plunger pumps, and radial plunger pumps. 1) Single plunger pump: The structure mainly consists of 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 is only related to the structural parameters of the pump. 2) Horizontal plunger pump: Horizontal plunger pumps consist of several plungers (generally 3 or 6) installed in parallel. A 1 crankshaft drives the plungers to perform reciprocating motion via connecting rod sliders or directly via an eccentric shaft, realizing a hydraulic pump for suction and discharge of liquids. They all adopt valve-type distribution devices, and most are 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. The working principle relies on the rotation of the crankshaft to drive the Piston to perform reciprocating motion, realizing liquid suction and discharge. 3) Axial type: Axial plunger pump (English name: Piston pump) is a plunger pump where 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 generated by the reciprocating motion of plungers parallel to the drive shaft within the plunger bores. Since both the plunger and the plunger bore are circular parts, they can achieve high-precision fit, 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 type hydraulic pumps mostly use pressurized tanks. For hydraulic tanks relying on air pressure for oil supply, after each machine startup, one must wait until the hydraulic tank reaches the operating air pressure before operating the machinery. If the machine is started when the air pressure in the hydraulic tank is insufficient, it will cause the slipper shoes inside the hydraulic pump to detach, resulting in 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 rate 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 life, and higher control precision than axial plunger pumps. The variable displacement of short-stroke variable pumps is achieved by changing the eccentricity of the stator under the action of the variable plunger and limit plunger. The maximum eccentricity of the stator is 5–9mm (depending on the displacement size), and the variable stroke is very short. Moreover, the variable mechanism is designed for high-pressure operation and controlled by a control valve. Therefore, the pump has a fast response speed. The radial structural design overcomes problems such as uneven wear of slipper shoes in axial plunger pumps, significantly improving its impact resistance. 6) Hydraulic type: Hydraulic plunger pumps rely on pressurized tanks for oil supply. After each machine startup, one must wait until the hydraulic tank reaches the operating air pressure before operating the machinery. Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply type hydraulic pumps mostly use pressurized tanks, and some hydraulic pumps have their own boost pumping units to provide pressure oil to the inlet of the hydraulic pump. Self-priming hydraulic pumps have strong self-priming capability and do not require external oil supply.

Interlit pump maintenance

(1) Inspect the plunger for scratches and corrosion; replace with a new part if necessary. (2) Check the fit of the plunger assembly. Insert the plunger end into the plunger barrel, tilt it by 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 barrel, block the oil inlet at the top and side 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 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, gently press the delivery valve downward with another finger; when the finger is removed from 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 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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