Reciprocating piston diaphragm pump , reciprocating piston pump, based on the diaphragm chamber by increasing the evolution. The utility model overcomes the defect that the piston pump seal is easy to wear, and has the advantages of high output pressure of the piston pump, sturdiness and durability, simple structure integrated into the diaphragm chamber and corrosion resistance. In the field of industry has been widely used in sewage treatment, metallurgy, chemical industry on the sludge and high abrasive slurry and other solid particles containing fluid high-lift or long-distance transport.

Currently on behalf of such diaphragm pump design, manufacturing international advanced level is the Netherlands HOLTHUTS GEHO diaphragm pump, in addition to the German FELUWA hose diaphragm pump, the domestic Shenyang Metallurgical Machinery Co., Ltd., Shanghai Dalong Machinery Factory and other domestic Diaphragm pump. The structure of the single-and double-acting hydraulic piston, the number of hydraulic cylinders, vertical piston horizontal motion. Double-acting double-cylinder horizontal, triple-horizontal single-cylinder, multi-cylinder single vertical role more commonly used.

My company is responsible for the installation of Germany's FELUWA company weighing about 25 tons of double-cylinder double-acting hose diaphragm pumps, and Shenyang Metallurgical Machinery Manufacturing Co., weighing about 94 tons of triple acting single-acting diaphragm pump, according to their own experience to sum up large reciprocating Piston diaphragm pump installation method. Due to the limited level of experience, it is inevitable that there are some problems and mistakes, please correct me.

First, the reciprocating piston diaphragm pump working principle and characteristics:

1, Reciprocating piston diaphragm pump works: Drive motor through the gearbox, driven gear reducer in the gear wheel rotation, connected by the crankshaft connecting rod mechanism alternately reciprocating the piston one after the reciprocating motion. By reciprocating the piston hydraulic drive fluid will produce volume changes. Hydraulic drive fluid to make the diaphragm concave and convex deformation, leading the front end of the pump chamber diaphragm movement, import and export of the pump chamber, with up and down one-way ball valve (ball check valve, outlet valve medium can only flow can not flow into the inlet valve medium only Can flow into the can not flow out), when the piston moves backward, the diaphragm gradually concave, the pump chamber volume gradually increases, the pressure gradually decreased below the inlet pipe pressure inlet valve open, the media flow into the pump chamber, the piston reaches the end Point, medium filled pump chamber, inlet valve closed. Inhalation process is completed, the beginning of the extrusion process. When the piston moves forward, the diaphragm gradually bulges, and the volume in the pump chamber becomes smaller and smaller, the pressure gradually increases, the outlet valve opens, and the medium gradually discharges out of the pump chamber. When the piston reaches the outside point, the outlet valve operates due to gravity and spring force The closure, the discharge process is over, the pump began a new inhalation process. This will continue to breathe and discharge fluids.

For hose diaphragm pumps, reciprocating pistons cause a change in the volume of the hydraulic fluid (primary fluid). The hydraulic driving fluid causes the flat diaphragm to deform, and drives the second hydraulic driving fluid (secondary hydraulic fluid) between the flat diaphragm and the hose. The secondary hydraulic fluid transfers this movement from the flat diaphragm to the hose. The change in the volume of the lumen in the lumen changes the pressure, so as to complete the inhalation and discharge process.

2, Reciprocating Piston Diaphragm Pump Features: Due to its operating characteristics, mechanical operation is partially closed by the diaphragm, immersed in the lubricant. Only the diaphragm and the flow path are in contact with the liquid material. The material and the mechanical parts are completely free from contact and can be transferred with chemically and mechanically aggressive, concentrated slurries or pastes and fluids of high viscosity. It can also be a highly dispersed liquid-solid two-phase flow. Vulnerable components only diaphragm and inlet and outlet check valve, easy to replace, low maintenance costs. Such pump pressure and flow adjustment, you can rely on the motor inverter, by adjusting the motor speed to achieve. However, such pump self-priming performance is poor.

Second, reciprocating piston diaphragm pump installation method:

1, clear the installation sequence based inspection and scribing → the pump body in place → installation to find and precision testing → reserve anchor bolt hole grouting → pump Jingping → secondary grouting → import and export buffer installation → auxiliary equipment installation → process Piping → filling → electrical equipment installation and commissioning → commissioning.

2, the main body of the pump installed in place before the installation should be in accordance with the construction plans and equipment, the axis and the edge of the line to define the baseline installation. After the device is calibrated, the leveling is generally carried out by leveling the horn. The method of laying the horn includes the standard pad method, the cross pad method, the bottom pad method, the auxiliary pad method and the hybrid pad method.

On the basis of placing the horn should be shovel flat so that the horn and the foundation of the contact between good. The number of horn group should not exceed 5, the length of the horn group into the bottom of the device should exceed the center of the equipment anchor bolt. When using mortar and grouting method, it is necessary to find a temporary leveling with a temporary horn group. When the strength of the grouting slurry or grouting layer reaches 75%, the temporary horn group should be dismantled and be adjusted with a formal horn group.

When the device is adjusted to adjust the horn, the thread and sliding surface should be painted with good waterproof grease, leveling the device, adjust the horn Qing also adjust the margin. When the equipment is adjusted with adjustment bolts, adjust the bolts without permanent support leveling, the horn under the base of the equipment is good, and then release the adjustment bolts, adjust the thickness of the bolt support plate should be greater than the bolt diameter, and the level of the upper plane Deviations of not more than 1/1000. The equipment is initially level, after finding the positive anchor bolts, anchor bolts should be coated with a small amount of grease in addition to the thread part, the polished rod part should be no oxide skin and oil, the bolt should be vertical without distortion, anchor bolts should not touch the bottom of the hole, Any part of the bolt from the hole wall distance of not less than 15mm. Pre-hole anchor grouting grouting should not make the anchor bolts skew or make the machine displacement.

When the pump is fine, the pump body should be found at the cross or head of the pump to find its correct level should meet the design requirements. Pump reducer, the main drive motor in place to be corrected, the pump should be based on the power end, according to the coupling requirements of the connection, followed by the reducer and the main drive motor to ensure that the axial tilt, radial displacement and end clearance to meet the design Or regulatory requirements. Secondary Grouting: After the pump body is horizontally and horizontally leveled, a set of horns is welded and welded for secondary grouting.

3, the assembly of other components to install the import and export valves, installation should pay attention to at the same time feeding pipe and the inlet valve and the diaphragm chamber under the elbow connected to pay attention to the connection gasket and the valve working medium flow, position adjustment Good after the feed pipe and feed valve uniform symmetrical locking.

Install imported feed compensation system. Installation, the pressure compensation tank, feed pressure compensation tank and feed pipe joints between the discharge air bag and the discharge pipe joints should pay attention to the installation of gaskets, lock nuts should be normal locking General torque requirements. Install outlet bumper, outlet connection tube. The discharge buffer gas bag installed should be able to discharge pressure feedback to the working pressure switch and the working pressure gauge. Install the inlet and outlet pipes and flush pipe fittings, flushing water pipes should be set to ensure that the pump thoroughly cleaned.

Pump power cabinet, on-site control cabinet, conductivity meter and valve condition monitor field cabinet in place, in accordance with the wiring diagram and the electrical self-control manual wiring and testing.

Fill the bumper with nitrogen. The reciprocating motion of the diaphragm pump, the instantaneous flow rate of its output is fluctuating according to trigonometric function with time. Pressure compensation must be carried out to ensure the stability of pressure on the import and export pipelines. Such pumps are generally equipped with airbags buffer, the flow of media and pressure on the "peak load". The buffer should be filled with nitrogen pressure, generally to ensure that the filling pressure of nitrogen 0.5 to 0.8 times the working pressure (according to the manufacturer installation instructions). This compensates for pulsation-induced fluctuations in the amount of excess flowrate over each stroke of the pump, the portion of the volume stored by compression of the volume of air within the accumulator being released during the intake stroke.

Lube oil filling, the following parts need to be in accordance with the diaphragm pump instructions on the provisions of filling oil: reducer, crankcase, power end of the lubricating oil tank, hydraulic oil and petrol station. Power end box before filling, you must first check the box body and Cross head slide clean condition, do not allow dust and impurities, impurities need to be cleaned before filling oil. Lubricants model and quantity should be strictly in accordance with the instructions on the manual.

Third, the reciprocating piston diaphragm pump load test run:

Before commissioning, you should first disassemble all the valve boxes and check whether the wearing parts in the box are corroded. If the rust is to be cleaned and rust removed, the installation should be free, and the fastening parts of the pump should be tightened, the motor should be turned and controlled System, instruments, electrical equipment, pumps around the oil level, process piping and flushing pipes are smooth, and the control valve switch is flexible and effective check. Hand pump should be hand crank, connecting rod observation window to observe the connecting rod to complete 3 to 5 trips should be smooth, no jam as well as abnormal sound. In the test before the first oil circulation, the entire system of oil circulation qualified before they can carry out the next step. The main role of oil circulation is to gearbox lubrication and temperature control. Oil station with a cooling device, and some oil heating device to prevent the oil temperature is too low at startup.

1, open the pump before the operating procedures: before the test run, the pump should be injected water exhaust, make-up exhaust and other processes. The purpose of water injection is to eliminate the hydraulic fluid in the diaphragm chamber and the pipe by hydraulic pressure to avoid knocking noise during pump operation.

At the same time, it needs to perfusion the slurry chamber before the operation to push the diaphragm to the inside, so that the diaphragm is close to the back wall of the diaphragm chamber to make it in the suction section of the diaphragm so as to push the liquid to the diaphragm chamber to fill the oil at the same time to eliminate the gas and realize the automatic perfusion.

Water injection and exhaust: open the flush valve and back to the water valve, the establishment of water washing circuit; connected to the control of liquid gas supply system, start lubricating oil pump, flushing the pump, pushing the liquid pump. Turn off the feed valve and discharge valve on the equipment process pipe. Slightly open the vent line on the process line. Slightly open the drain valve on the process line. Open the inlet valve on the process line. To be on the process pipeline exhaust valve does not appear after the bubble, the lag for some time to close the exhaust valve, the end of water treatment process.

Exhaust gas exhaust: drive oil. In the suction section, due to the small amount of hydraulic fluid, the diaphragm will be in the dead center position before the pressure to the control panel through the crank to open the exhaust valve, the piston formed by the vacuum and the tank level to fill until the diaphragm moves Until the limit of time. Piston discharge section of the piston displacement before, there is a fixed amount of hydraulic fluid through the exhaust valve into the pressure tank, so that the first stroke suction section into the hydraulic oil air, released in the tank. During the entire process of charging oil in the crankcase, the exhaust valve of the fuel tank must be kept open until the air is purged.

2, start the pump process: diaphragm pump test only load test, test drive instead of using water instead of conveying medium, can not idling to avoid burning seal. Water test run, the diaphragm pump rinse water normal operation 3min, turn off the rinse water inlet valve, open the slurry inlet valve; close the rinse water back to the valve, open the slurry return valve, the establishment of slurry tank (containing Test water) → diaphragm pump → slurry tank with water test run circuit.

If the belt material should continue to run according to the following: After the pump belt normal operation 3min, turn off the flushing water inlet valve, open the slurry inlet valve; close the flushing water return valve, open the slurry return valve, the establishment of slurry tank → diaphragm pump → slurry tank slurry circulation loop. Due to the poor self-priming ability of such pumps, for higher consistency fluids, a feed pump (optional centrifugal slurry pump) should be placed in front of the suction side of the diaphragm pump, ie feed of slurry tank → diaphragm pump Route to slurry tank → feed pump → diaphragm pump feed route.

To be qualified pump outlet slurry composition, get the slurry can be normal delivery instructions, open the slurry outlet valve, close the slurry return valve, through the main drive motor drive to adjust the pump delivery flow.

3, pump parking: pump stopped, disconnect the motor, and then close the outlet valve, and finally close the inlet valve. Disconnect the pump from power to prevent restarting.

If it is running with the material, stop the pump according to the following steps: receiving stop the pump command, open the slurry return valve, close the slurry outlet valve, the establishment of slurry tank → feed pump → diaphragm pump → slurry tank slurry Loop loop.

Then open the diaphragm pump flush water inlet valve, open the diaphragm pump flush water return valve, close the diaphragm pump slurry inlet valve {close the feed pump outlet valve, stop the feed pump motor, close the feed pump inlet valve, close the feed Pump auxiliary equipment pipeline valve (until the feed pump cooling and then close the cooling water valve)}, close the slurry return valve, the establishment of water flush circuit, the general operation of 15min. (Note: in parentheses, parking sequence with feeding pump) After the diaphragm pump and pipeline are cleaned, the diaphragm pump is electrically stopped. Close the flush water inlet valve and close the flush water return valve.

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