Stainless steel multi-stage centrifugal pump faults and solutions

D-type pump multi-stage centrifugal pump First, an overview of the D-type multi-stage centrifugal pump, segment, suitable for mining, factories and urban water supply, drainage use. For conveying without solid particles and abrasives. Clear water without suspended solids, or other liquids with physical and chemical properties similar to clear water. The temperature of the liquid to be transferred is -20°C~80°C.
Second, the model description 1) Example 150D30X5
150—Pump inlet diameter (mm)
D - multi-stage, segment centrifugal clean water pump 30 - single stage lift is 30m
5—The number of pump stages is 5 2) Example D 280-43X5
D—Flow rate of multi-stage, segment centrifugal water pump 280—pump (m3/h)
43—The single-stage head is 43m
5—The number of stages of the pump is 5 levels. III. Structure Description 1. Pump housing The pump housing part is mainly connected by bolts, bearings, front section, middle section, rear section, guide vanes, etc.
The suction line at the front stage is horizontal, and the center line at the back stage is perpendicular to the horizontal.
2. Rotor part The rotor part is mainly composed of the bearing and the impeller, bushing, balance plate and other parts installed on the shaft. The parts on the shaft are fastened with flat keys and sleeve nuts so that they are integral with the shaft. The entire rotor is supported on the pump housing by bearings at both ends. The number of impellers in the rotor section is determined by the number of stages of the pump.
3, the bearing part of the D-type pump bearings are two kinds of sliding bearings and rolling bearings, depending on the model is different, do not bear the axial force. The pump should allow the rotor to move axially in the pump housing during operation, and radial bearings cannot be used.
4. The sealing surfaces of the pump's sealing pump are molybdenum disulfide grease sealing between the front section, middle section and rear section. The sealing ring, guide vane sleeve and packing seal are used between the rotor part and the fixed part. When the sealing ring and guide vane are When the degree of wear of the sleeve has affected the operation and performance of the pump, it should be promptly replaced.
5. Balance mechanism The balance mechanism consists of a balance ring, a balance plate, and a balance sleeve. The balance mechanism is used to balance the axial force of the pump.
In the following procedures, please pay attention to the words “warning”, “careful” and “attention”. These words are intended to emphasize personal safety and proper operation methods and maintenance. The meaning of these words is explained as follows:
Warning: Operation procedures, habits and other violations may cause personal injury accidents Caution: Operation procedures, habits, etc. If violated, may cause damage to the equipment Attention: Operating procedures, conditions, etc. should be given great attention Fourth, arrival check after arrival The equipment shall be checked immediately and any defects caused by the shipment shall be immediately reported to the carrier. The text of the instruction manual and the instructions and packing lists of other components (such as motors) should be stored in a safe and convenient place for reference at any time.
V. Assembly and disassembly of the pump 1. Assembly of the pump The assembly quality of the D-type pump directly affects the normal operation of the pump, and affects the service life and performance parameters of the pump; it affects the vibration and noise of the unit, and attention should be paid to the assembly. The following points:
a. The concentricity of the fixed parts after the combination of parts is ensured by the parts manufacturing precision and assembly quality. The processing precision and surface roughness of the parts should be guaranteed, and touching and scratching are not allowed. The molybdenum disulfide used as sealant should be clean. The fastening screws and bolts should be evenly loaded.
b. The neutrality of the impeller outlet flow path and the guide vane inlet flow path is ensured by the axial dimension of each part. The neutrality of the flow path directly affects the performance of the pump, so the size of the pump cannot be arbitrarily adjusted.
c. After the pump is assembled, before turning on the packing, turn the pump rotor by hand and check whether the rotation of the pump rotor in the housing is flexible and whether the axial turbulence meets the specified requirements.
d. After the above check meets the requirements, fill the shaft seals at both ends of the pump. Note the relative position of the packing rings in the packing room.
2. The disassembly of the pump should be performed in the reverse order of the assembly. When disassembling, the manufacturing precision of the parts should be strictly protected from damage.
b. When disassembling the penetrating rod, each mid-section should be padded with a pad to avoid sinking and bending of the shaft after each mid-section stop loosens.
VI. Installation of the pump In addition to meeting the general installation technical requirements when installing the D pump, the following points should also be noted:
1. When the motor and the water pump are combined and installed, the axial end of the pump coupling should be pulled out, and the gap value of 2-3 mm is reserved, so as to ensure the axial clearance between the two couplings of the pump and the motor.
Note: Make sure that the bottom plate is leveled and the equipment is well leveled before grouting. CAUTION: To make the installation successful, the coupling adjustment must be correct and the flexible coupling cannot compensate for any significant misalignment. Misadjustments can cause rapid wear, noise, vibration, and damage to the equipment. Therefore, the coupling must be adjusted within the limits given.
Caution: Measures must be taken to support the inlet and outlet pipes of the pump to prevent excessive pump inlet and outlet loads. 2. The centerline of the pump and the motor shaft should be on the same horizontal line.
3, the pump can only withstand its own internal forces, can not withstand any external force.
VII. Starting, running and parking of the pump (1) Starting:
Warning: For the operator's safety, do not operate beyond the pump's nameplate to avoid jeopardizing the safety of the equipment and operators. To ensure smooth operation and maintenance of the pump and other actions, refer to the instructions.
1. Before starting the pump, start the rotor and check if the rotor is flexible.
2. Check whether the motor steering is consistent with the pump's steering.
3, close the pump outlet gate valve, pressure gauge cock, with the delivery of liquid or vacuum system to exclude the suction pipe and the pump body air (non-empty start-up operation is strictly prohibited).
4. Check the tightness of the coupling bolts between the pump and the motor and the safety conditions around the pump so that the pump is ready to start.
Warning: The device can operate only after the coupling guard is installed. Ignoring this point can cause injury or death.
5. Start the pump. After the pump is running normally, open the pressure gauge cock, slowly open the outlet gate valve, and control the pump's given head according to the outlet pressure gauge reading.
(b) Operation:
1. The D-type pump balances the axial force by the internal balance mechanism. The balance device has balanced liquid flow. The balance liquid is connected to the suction section by the balance water pipe or a short pipe is set at the balance room. The balanced liquid flows to the pump through the short pipe. In order to ensure the normal operation of the pump, the balanced water pipe must not block.
2. The D-type pump rolling bearing has no cooling device. The temperature rise of the bearing reflects the assembly quality of the pump. The temperature rise of the bearing must not exceed 35°C of the ambient temperature, and the maximum temperature should not exceed 75°C.
WARNING: Operating equipment that is not properly lubricated can cause the bearing to heat, break, stall the pump, damage the equipment, and cause personal injury to the operator.
3. There is a certain axial movement of the D-type pump rotor during operation, and the gap between the end surfaces of the two couplings of the motor and the pump should be guaranteed.
4. During the operation of the pump, the wear of the impeller, seal ring, guide vane sleeve, balance disc, and sleeve should be regularly checked. Excessive wear should be promptly replaced.
Warning: Do not attempt to repair, maintain, or clean the area near the rotating machine. Doing so may endanger the safety of the operator.
5, the user should set out a more detailed operating procedures based on specific circumstances.
(3) Parking: Before the vehicle is parked, the pressure gauge cock must be closed, and then the outlet gate valve should be closed slowly. The motor can be stopped only after the outlet gate valve is closed.
Eight, the pump may be the failure and solution failure Cause Solution 1, the pump does not absorb water; pressure gauges and vacuum gauge pointer violently jump into the pump water is not enough; water pump or instrument leakage and then into the pump water injection; tighten or plug the leak Out 2, the pump does not absorb water, the vacuum table shows the height of the vacuum bottom valve is not open or blocked; too much water resistance; suction height is too high and exceed the allowable value to correct or replace the bottom valve; cleaning or replacement of the suction pipe; reduce the water absorption height 3, Look at the pressure meter water pump outlet pressure, and the pump is still not out of water outlet pipe resistance is too large; the direction of rotation is not right; the impeller is blocked; the pump speed is not enough to check or shorten the outlet pipe; change the motor steering; cleaning the impeller; increase the speed of the pump shaft 4, The flow rate is lower than the expected pump choking; The seal ring wears too much; The speed is not enough to clean the pump and the pipe; Replace the seal ring; Increase the speed of the water pump shaft; 5. The power consumed by the pump is too large; the packing gland is too tight; the impeller wears; the pump water supply increases. Loosen the packing gland or remove the packing from the side; replace the impeller; adjust the gate valve to reduce the flow 6. The water pump is in the working process Abnormal sound, the flow rate decreases until no water is produced; the early wear of the balancing device opens too much; the resistance of the suction pipe is too large; there is air infiltration at the suction; the water absorption height is too high; the temperature of the transported liquid is too high to adjust the gate valve to reduce the flow; Check the suction pipe; check the bottom valve; reduce the water absorption height; tighten or block the water leakage; reduce the liquid temperature. 7. The pump vibration shaft and the motor axis are not on the same center line. The shaft center line of the water pump and the motor is aligned 8. The bearing is overheated There is no oil or dirty oil; the pump shaft and the motor shaft do not fill or change oil in a centerline; align the centerline of the shaft.

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Ribbon Vacuum Dryer Machine

LZG vacuum ribbom dryer is mainly used for drying powdery and pasty materials, granule mateirals, thermosensitive materials, easily oxidized materials, explosive materials, toxic materials etc

Description

LDG ribbon Vacuum Drying Machine is a high-efficiency vertical type drying equipment which integrates drying, crushing, vacuum decompression and mixed powder. Its drying efficiency is three to five times of the same specification Double Cone Vacuum Dryer.

This ribbon vacuum dryer machine is used for drying powdery materials in the pharmaceutical, nourishment, nourishment, food, chemical, pesticide and other industries. The whole process can achieve closed continuous operation. This vacuum drying machine is the preferred equipment for the above industries.

Features of Ribbon Vacuum Dryer Machine

1. The working process of LDG drying machine uses intermittent operation, after the wet materials enter into the stock bin, through the wall jacket to heat and dry the materials. Transmission shaft heating is also available, which can heat more sufficiently.

2. With overall sealing system, non-pollution and high purity, this ribbon vacuum dryer is especially used for mixing and drying pharmaceutical intermediates and crude drugs as well as sterile APIs.

3. This ribbon vacuum drying machine adopts small angle taper type tube structure, which makes quick unloading speed, clean and no accumulations.

4. LHG ribbon vacuum dryer machine possesses compact structure, smooth movement, simple operation and long service life.

Main Components

LDG ribbon vacuum drying machine consists of motor, reducer, rack, mechanical seal, filer, helical ribbon mixer, conical cylinder with jacket heating and discharging valve.

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