German Ritz pump Ritz model Ritz price

Ritz 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 heavy-load machinery.

Ritz pump structural forms

Piston pumps are divided into two representative structural forms: axial piston pumps and radial piston pumps. Since radial piston pumps are a new type of high-efficiency pump with high technical content, with the acceleration of localization, radial piston pumps will inevitably become an important part of the application field of piston pumps. A radial piston pump is a piston pump in which the reciprocating motion direction of the piston or plunger is perpendicular to the drive shaft. Working principle of radial piston pump: Drive torque is transmitted from the drive shaft to the star-shaped hydraulic cylinder rotor via a cross coupling, and 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 through hydrostatically balanced slippers. The piston is connected to the slipper via 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. When the rotor rotates, due to the eccentricity of the stator, the piston performs reciprocating motion, and its stroke is 2 times the eccentricity of the stator. The eccentricity of the stator can be adjusted by two pistons located at opposite radial positions on the pump body. Oil inlet and outlet occur through flow channels on the pump body and distribution shaft, controlled by the suction port on the distribution shaft. The hydraulic pressure generated inside 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 only serve a supporting role and are not subjected to other external forces. In hydraulic systems: Axial piston pumps operate by utilizing volume changes generated 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, they can achieve very high precision fits during machining.

Ritz pump mechanical principles

The total reciprocating stroke L of the plunger in a plunger pump is constant and determined by the cam lift. The fuel delivery volume per cycle depends on the effective delivery stroke, which 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 delivery timing, thereby adjusting the delivered fuel volume. During operation, the cam on the injection pump camshaft and the plunger spring force the plunger to move up and down reciprocally, completing the pumping task. The pumping process can be divided into the following two stages: 1) Intake process: After the cam lobe rotates past, the plunger moves downward under spring force, creating a vacuum in the upper space of the plunger (called the pumping chamber). When the top face of the plunger uncovers the inlet port on the plunger sleeve, diesel fuel filling the oil passage in the upper body of the pump enters the pumping chamber through the port. The intake ends when the plunger reaches bottom dead center. 2) Return process: As 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 bore, radial holes, and helical groove at the plunger head. Oil pressure drops sharply, and the delivery valve closes rapidly under spring force, stopping fuel delivery. The plunger continues moving upward; after the cam lobe rotates past, the plunger moves downward again under spring action, starting the next cycle. This description uses a single-plunger principle: a plunger pump has two check valves oriented in opposite directions. When the plunger moves in one direction, negative pressure develops 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 produces continuous fuel delivery through continuous motion.

Ritz pump mechanical maintenance

For piston pumps supplied with oil by a charge pump, after 3000h of use, operators need to inspect the piston pump 1-2 times daily to check whether the operating sound of the hydraulic pump is normal. If a decrease in hydraulic cylinder speed or stalling is found, the charge pump should be disassembled for inspection to check for scratches on the impeller edge and whether the internal gear pump clearance is excessive. For self-priming piston pumps, the oil level in the hydraulic tank must not be lower than the lower limit of the oil gauge; sufficient hydraulic oil must be maintained. The higher the cleanliness of the hydraulic oil, the longer the service life of the hydraulic pump. The most important component of a piston pump is the bearing. If the bearing develops clearance, the normal clearance of the three pairs of friction pairs inside the hydraulic pump cannot be guaranteed, and the thickness of the static hydraulic support oil film of each friction pair will be damaged, reducing the service life of the piston pump bearing. According to data provided by hydraulic pump manufacturers, the average service life of bearings is 10000h, and new ones need to be replaced if this value is exceeded. For removed bearings, without professional testing instruments, bearing clearance cannot be detected; only visual inspection is possible. If scratches or discoloration are found on the roller surface, replacement is necessary. When replacing bearings, attention should be paid to the English letters and model numbers of the original bearings. Piston pump bearings mostly adopt high-load capacity bearings. Purchase products from the original manufacturer with original specifications. If switching to another brand, consult personnel experienced with bearings to check tables for equivalents, aiming to maintain the precision grade and load capacity of the bearing. The length of service life of a piston pump is related to routine maintenance, the quantity and quality of hydraulic oil, and oil cleanliness. Avoiding wear caused by particles in the oil to the friction pairs of the piston pump is also an effective way to extend the service life of the piston pump. During maintenance, try to use original factory-produced parts when replacing components. These parts are sometimes more expensive than other counterfeit parts, but their quality and stability are better. Purchasing cheap counterfeit parts may seem to save costs in the short term, but it brings hidden dangers and may cause greater harm to the use of the piston pump. The distribution plate has two forms: flat distribution and spherical distribution. For friction pairs with spherical distribution, if the scratches on the cylinder block distribution surface are relatively shallow, they can be repaired by grinding; if the grooves on the cylinder block distribution surface are deep, surface engineering technology should first be used to fill the grooves before grinding. Blind grinding should be avoided to prevent the copper layer from becoming too thin or exposing the steel base, leading to oil leakage. Piston pumps can also use frequency converters to save electrical energy. Engineers from Shanghai Zhengyi pointed out that in actual production processes, piston pumps usually regulate their working status by pressure or flow. When the actual pressure is greater than the required pressure, it is regulated by a relief valve to keep the working pressure stable, allowing the relief valve to release the excess. The motor always runs at full speed with repeated actions, and power consumption remains unchanged. When using overflow to regulate pressure and flow, part of the surplus flows back to the original system, resulting in useless power in the piston pump and low work efficiency. If using Chuangjie energy-saving frequency converters, the relief valve can be set to close, and the working pressure is automatically adjusted by the energy-saving frequency converter itself to maintain stable working pressure and automatically track the equipment pressure. This achieves automated control, thereby saving energy consumption. The biggest advantage of this regulation method is that it can reduce the operating energy consumption of the piston pump, with power saving effects reaching over 30%.

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