German Sterling SIHI pump, Sterling SIHI model, Sterling SIHI price

Sterling SIHI pumps operate by using impeller rotation to induce centrifugal motion in water. Before starting the pump, the pump casing and suction pipe must be filled with water. Then, start the motor to drive the pump shaft, causing the impeller and water to rotate at high speed. The water undergoes centrifugal motion, is thrown toward the outer edge of the impeller, and flows into the pump's discharge piping through the passages of the volute casing.

Sterling SIHI pump structure composition

The basic structure of a centrifugal pump consists of six parts: impeller, pump body, pump shaft, bearing, sealing ring, and packing gland. 1) The impeller is the core part of the centrifugal pump; it has high rotational speed and high output power. The blades on the impeller play a major role. The impeller must undergo a static balance test before assembly. The inner and outer surfaces of the impeller must be smooth to reduce friction losses from water flow. 2) The pump body, also known as the pump casing, is the main body of the water pump. It provides support and fixation and connects to the bracket where the bearings are installed. 3) The pump shaft connects to the motor via a coupling to transmit the motor's torque to the impeller, making it the primary component for transmitting mechanical energy. 4) Sliding bearings use transparent oil as a lubricant; fill oil to the oil level line. Too much oil will seep out along the pump shaft, while too little will cause the bearing to overheat and burn out, leading to accidents! During pump operation, the maximum bearing temperature is 85 degrees, and normal operating temperature is around 60 degrees. 5) The sealing ring is also known as the leakage reduction ring. 6) The packing gland mainly consists of packing, water seal ring, packing sleeve, packing gland cover, and water seal pipe. The main function of the packing gland is to seal the gap between the pump casing and the pump shaft, preventing water inside the pump from leaking out and air from entering the pump, thereby maintaining the vacuum inside the water pump. When heat is generated by friction between the pump shaft and the packing, the water seal pipe directs water into the water seal ring to cool the packing, ensuring normal pump operation. Therefore, inspection of the packing gland requires special attention during routine pump operation checks. The packing should be replaced after approximately 600 hours of operation.

Sterling SIHI pump mechanical principle

The total stroke L of the plunger's reciprocating motion in a plunger pump is constant and determined by the cam lift. The fuel supply volume per cycle depends on the fuel supply stroke, which is variable and not controlled by the camshaft. The start timing of fuel supply does not change with variations in the fuel supply stroke. Rotating the plunger changes the end timing of fuel supply, thereby altering the fuel supply volume. When the plunger pump operates, 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 two stages: 1) Fuel intake process: After the convex part of the cam rotates past, the plunger moves downward under spring force. A vacuum is created in the upper space of the plunger (known as the pump chamber). When the upper end face of the plunger opens the inlet hole on the plunger sleeve, diesel fuel filling the oil passage in the upper body of the oil pump enters the pump chamber through the oil hole. The intake process ends when the plunger reaches the bottom dead center. 2) Return oil process: The plunger supplies fuel upward. When the upward movement aligns the helical groove (cut-off edge) on the plunger with the return oil hole on the sleeve, the low-pressure oil circuit in the pump chamber communicates with the central hole, radial hole, and helical groove at the plunger head. Oil pressure drops sharply, and the delivery valve closes rapidly under spring force, stopping fuel supply. The plunger continues to move upward. After the convex part of the cam rotates past, the plunger moves downward again under spring action, beginning the next cycle. This description uses a single plunger as the principle example. A plunger pump has two check valves with opposite directions. When the plunger moves in one direction, negative pressure occurs in the cylinder, opening one check valve to draw liquid into the cylinder. When the plunger moves in the other direction, the liquid is compressed, opening the other check valve to discharge the liquid drawn into the cylinder. This continuous operation results in continuous fuel supply.

Sterling SIHI pump mechanical maintenance

For plunger pumps using a boost pump for oil supply, after 3000h of use, operators must inspect the plunger pump 1-2 times daily to check if the hydraulic pump operating noise is normal. If a decrease in hydraulic cylinder speed or stalling is observed, the boost pump should be disassembled for inspection to check for scoring on the impeller edges and excessive clearance in the internal gear pump. For self-priming plunger pumps, the oil level in the hydraulic tank must not fall below the lower limit of the oil gauge; sufficient hydraulic oil must be maintained. Higher cleanliness of hydraulic oil extends the service life of the hydraulic pump. The most important component of a plunger pump is the bearing. If bearing clearance occurs, the normal clearance of the three pairs of friction pairs inside the hydraulic pump cannot be guaranteed, and the thickness of the static hydrostatic support oil film for each friction pair will be compromised, reducing the service life of the plunger pump bearings. According to data provided by hydraulic pump manufacturers, the average service life of bearings is 10000h. Beyond this value, new bearings must be replaced. Removed bearings cannot have their clearance detected without professional testing instruments; only visual inspection is possible. If scratches or discoloration are found on the roller surface, replacement is mandatory. When replacing bearings, note the English letters and model number of the original bearing. Plunger pump bearings mostly use high-load capacity bearings. Purchase products from the original manufacturer with original specifications. If switching to another brand, consult experienced personnel to cross-reference tables to maintain the bearing's precision grade and load capacity. The service life of a plunger pump depends on routine maintenance, the quantity and quality of hydraulic oil, and oil cleanliness. Avoiding wear on the plunger pump friction pairs caused by particles in the oil is an effective way to extend pump life. During maintenance, use original manufacturer parts whenever possible. These parts may be more expensive than counterfeit alternatives, but they offer better quality and stability. Purchasing cheap counterfeit parts may seem cost-effective in the short term but introduces hidden dangers and may cause greater harm to the plunger pump. Distribution plates come in two forms: flat distribution and spherical distribution. For spherical distribution friction pairs, if scratches on the cylinder block distribution surface are shallow, they can be repaired by grinding. If grooves are deep, surface engineering techniques should first be used to fill the grooves before grinding. Blind grinding should be avoided to prevent thinning of the copper layer or exposing the steel base, which could lead to oil leakage. Plunger pumps can also use frequency converters to save energy. Engineers from Shanghai Zhengyi point out that in actual production processes, plunger pumps typically regulate their operating status based on pressure or flow. When actual pressure exceeds required pressure, relief valves are used to regulate and maintain stable working pressure by releasing the excess. However, the motor continues to run at full speed with repeated actions and constant power consumption. When using overflow to regulate pressure and flow, some surplus flows back to the original system, resulting in useless power in the plunger pump and low work efficiency. If a Chuangjie energy-saving frequency converter is used, the relief valve can be set to close. The energy-saving frequency converter automatically adjusts the working pressure, maintains stable working pressure, and automatically tracks equipment pressure. This achieves automated control and saves energy consumption. The greatest advantage of this regulation method is the reduction of operating energy consumption for plunger pumps, with power saving effects reaching over 30%.

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