After the hub of the pump assembly coupling is assembled on the shaft, the vertical and coaxial degrees of the hub and the shaft should be carefully checked. Usually in the hub of the end and the outer circle set up two dial indicator, turning the wheel when the rotation, observe the hub of the whole beating (including the end of beating and radial run) values, determine the vertical axis and the axis of the axis and coaxial The situation of the situation. Different speed coupling of the requirements of the whole beating different values, different types of coupling on the requirements of the whole beating are also different, but the wheel assembly on the axis after the hub must be the total beating deviation of the value of Design requirements within the tolerance range, which is one of the main quality requirements of the coupling assembly.
Pump assembly caused by the hub of the total beating value does not meet the requirements of many reasons, the first may occur in the manufacturing process due to the error caused by processing for the field assembly, mainly due to correct the wheel hole surface treatment is not correct, so that the hub and axis concentric The degree of deviation. Another reason is that there is a key coupling in the assembly, due to improper assembly of the key caused by the hub and the shaft different axis. The correct installation of the key should be the key side of the key and the keyway wall tightly fit, usually in the assembly with color inspection, with a bad time can be used to repair the file or blade to meet the requirements. Key upper part of the general gap, about 0.1-0.2mm or so. High-speed rotating machinery for the hub and the axis of the coaxial degree of high demand, with a single bond can not get a high degree of coaxial, with double bond or spline connection can make the coaxial degree of both improved.
The minimum submerged depth of the pump is a prerequisite for proper operation of the pump. The samples on the factory are marked with clear data. The Panda pump indicates that the data is calculated on the basis of:
1. According to the pump’s abundance allowance calculation, to ensure that the pump does not occur cavitation.
2. For submersible pumps in the upper part of the motor, if the motor cooling cycle is not installed, the entire motor is immersed in water to cool the motor stator.
3. The minimum submerged depth is to ensure that the pump running, the sink does not occur in the whirlpool, the air is not involved in the import of the pump, and to ensure that the liquid flow into the pump evenly distributed.
Moreover, Nanjing lanshen Pump Corp.LTD. found that some pumping stations due to the flow and inhalation pool conditions are limited, the pump running after the change in the water level is very large, inhalation tank water level, resulting in the actual submerged depth below the minimum submerged depth, resulting in the pump can not run properly, Cavitation. Such as a pumping station, suction pool minimum water level elevation of 1m, up to 4.5m, water depth difference of 3.5m. If the pump station is designed according to the 1m elevation, the whole pumping station is dug deep and the elevation design is raised. The submerged depth is less than the minimum submerged depth.
In response to the customers’ requirements, today we will introduce what is included in the sewage pump measurement accuracy
1.Sewage pump start, diesel engine start, emergency stop, increase or decrease;
2.Electric valve control (control flow);
3.Sewage pump conditions to switch to the implementation of the test process control;
4.Automatic start-up control of the cooling device;
5.Diesel engine water temperature, oil temperature, oil pressure and gear box oil temperature automatic monitoring and alarm.
Crankshaft is an important part of the submersible pump, in the course of the use, it is often damaged, how to try to maintain its life, as we urgently need to solve the problem, then we introduce the submersible pump crankshaft daily maintenance measures:
1.Submersible pump crankshaft normal operation of the submersible pump every 8h maintenance time, by the shift pump workers, every 2h tour check a submersible pump and motor operation.
2.Check the submersible pump oil is in line with the requirements, there are problems in a timely manner to add or replace, to ensure that the lubrication of the normal work.
3.Check and adjust the submersible pump packing letter, and to ensure that the fixed, connecting bolts without loosening.
4.Check the unit vibration operation without abnormal sound, should meet the requirements of this standard, the instrument action sensitive and accurate.
5.Submersible pump crankshaft equipment to deal with leakage and do a good sanitation work.
The above is about the submersible pump crankshaft daily maintenance of the relevant matters related to the introduction, in the daily use of attention to these points will be able to ensure the normal operation of the submersible pump to extend its service life.
Sewage pump is a common device for us, have brought some impact to our lives, sewage pump manufacturers in order to let everyone maintain it better, it is necessary to understand its exhaust treatment measures.
1.It is necessary to have a pre-pump when use sewage pump, use the pre-pump to make the system pressure be a certain range, then start the sewage pump. So you can avoid the sewage pump overload, the former pump can choose water ring vacuum pump, Rotary vane vacuum pump, slide valve vacuum pump, reciprocating vacuum pump can be the atmosphere of the vacuum pump.
2.For higher occasions, the sewage pump can not be straight into the atmosphere. The front of the atmosphere will constitute the sewage pump suction port and exhaust pressure difference is too large, so that the sewage pump overload. To ensure that sewage pump can reach a higher vacuum, it is necessary to be sure that the sewage pump has open space between the rotor.
3.Due to the continuous rotation of the rotor, the suction gas from the inlet into the rotor and the pump shell between the space, and then discharged through the exhaust. As the inspiratory space is fully closed, so the gas in the pump chamber is not tightening and swelling. However, when the top of the rotor turns through the edge of the exhaust port, when the v0 space communicates with the exhaust side, a part of the gas flows back to the space v0 to increase the gas pressure. When the rotor continues to change, the gas is drained outside the pump.
Nanjing lanshen Pump Corp.LTD. warm reminder: when sewage pump in use, it must be normal exhaust, otherwise the gas exists in the pump will affect the entire machine, serious will lead to the whole machine paralyzed.
The rotor of the sewage pump is rotated by the periodic transformation of a plurality of fixed volume transport units in the working chamber so as to change the volume of the sewage pump so as to constitute a higher vacuum and discharge pressure.
The two rotors of the sewage pump are operated synchronously by a pair of high precision gears. The drive shaft is connected to the motor via a coupling. The motor and gear are placed on the same side of the rotor. The driven rotor is directly driven by the motor side gear so that the torsional deformation of the active rotor shaft is small and the gap between the two rotors is not changed by the large torsional deformation of the drive shaft so that the gap between the rotors is running The process is uniform.
With the continuous development of the times, the word “sewage pump” is more and more popular and the application is gradually being promoted. The flow line structure of the rotor rotation and without the dead space and non-metal parts in the rotor chamber avoid the pollution to the transported material.
Submersible pumps and sewage pumps are widely used, both are pump types, but different usage results the different function. Then how to distinguish the submersible pump and sewage pump, Nanjing lanshen Pump Corp.LTD. introduces its differences for you.
1.The use technology is different
Submersible pumps suitable for some special process requirements, such as leakage, special fluid medium. Sewage pumps are generally used for regulation, there are switching capacity, such as fan coil end.
2.Forms of switch are different
Submersible pump through the coil drive, can only open or close, switch action time is short. Sewage pump drive is generally used motor, open or close action to complete a certain amount of time required to do analog, you can do adjustment. Recommended reading: how to determine the head of the submersible pump
3.The working performance is different
Submersible pump general circulation coefficient is very small, and the working pressure difference is very small. For example, the general diameter of the submersible pump diameter of 15 than 15-valve ball valve is much smaller. Submersible pump drive is through the electromagnetic coil, relatively easy to be damaged by voltage shock. Equivalent to the role of the switch is to open and close the two roles.
Sewage pump drive is generally used motor, more resistant to voltage shock. Submersible pump is fast opening and fast closing, generally used in small flow and small pressure, the required switching frequency of the local sewage pump and vice versa. Sewage pump valve opening can be controlled, the state has on, off, half open halfway, you can control the flow of media in the pipeline submersible pumps fail to meet this requirement. Submersible pump can be reset when power cut, while sewage pump need to add reset device if with this function.
When the liquid was shaken to the impeller exit, the impeller inlet center to form a low pressure in the suction tank and the impeller at the center of the liquid produced a pressure difference between the suction tank in the liquid under the effect of this pressure, The ground through the suction pipe and pump suction chamber into the impeller. Lanshen pump repair pump the most important attention to detail, whether it is centrifugal pumps or other forms of pumps are the same, I remember once a maintenance of the pump for many years a master because the pump body a small screw did not make the final result Pump failure is completely damaged.
The midline of the impeller exit center line, or the impeller exit width, in the volute pump should be aligned with the volute inlet centerline. So that the impeller in the rotation process, while constantly inhalation of liquid, while constantly to the inhalation of liquid with a certain amount of energy to the liquid discharge, so that centrifugal pump to work continuously. If the missing, it should be in the impeller wheel shaft and shoulder pad by adding additional adjustment. The two center lines should be controlled within the range of 0.5 mm. For a pump with a slightly lesser number of rotations, the effect on the performance of the pump is not significant. For pumps with medium to low specific speed, because the impeller exit is very narrow, for example, the impeller outlet is only 10 mm wide. If the volumetric center line is 1 mm, Of the performance there is a clear impact. It is recommended to adjust the error of the two midline (impeller and volute) within 5% of the impeller exit width.
The same is true for multi-stage pump, is to control the impeller exit center line and guide vane import center line error. Spatial guide vane pump, preferably with the data given in the assembly diagram to determine the position of the impeller in the space guide vanes. If there is no drawing, or empirically, or through the test results to adjust the position of the impeller.
1.The arrangement ways of pump
(1) open-air arrangement
Generally concentrated in the pump arranged under the gallery or the side can also be arranged around the miscellaneous suction equipment, the main advantage is good ventilation, manipulation and maintenance convenience. If the pump layout below the maze of the gallery, the pump outlet center line should be aligned from the central line of the pillar column 0.6m.
(2) semi-open arrangement
Semi-open arrangement of the pump used in rainy areas, generally arranged in the gallery below the pump, located in the upper part of the pipe roof. Or the pump is arranged on the lower floor of the frame, and the frame platform is used as the ceiling. According to the pump layout requirements, the pump layout in single row, double row or multiple rows.
(3) interior arrangement
Indoor arrangement of the pump for cold or sandy areas, and the process has special requirements of the occasion.
2.The arrange requirements of pump
(1) for open-air or semi-open-air pump arrangement, the pump is usually the original idea of the axis and pipe axis perpendicular to the axis.
(2) for indoor pump, when the delivery of liquid temperature is higher than the natural point or liquid transport of liquid hydrocarbons should be arranged with the other pumps were mixed in their respective rooms, and separated by a firewall.
Pump layout in the room, generally do not consider the motor vehicle inspection requirements. Pump side or side of the pump and the distance between the wall should not be less than 1.2 ~ 1.5m, two rows of pumps should not be less than the distance between 2m.
The position of the withdrawing piston and rod should be left on the power and pump sides of the steam reciprocating pump.
Vertical pump installed in the gallery below the bottom of the frame or frame, the top should be set aside for the pump installation and inspection of the space required.
In these several days, cold air suddenly gather down, and instantly felt the winter atmosphere. Today we tell you how to prevent the sewage pump freezing in winter. In this case, customers in Xinjiang, Tibet can use now.
In winter, sewage pump users are most worried about is freezing. So how to prevent the sewage pump freezing in the cold winter? How to protect the sewage pump in cold areas can operate normally? With these problems, we will share some tips about how to prevent the sewage pump freezing.
1.Heating sewage pump casing or in the sewage pump into the hot water.
2.Placing sewage pump in a room temperature environment.
3.Placing the sewage pump in well which deeper from the ground.
4.If the sewage pump is the insulation type sewage pump, we can add steam or hot water in the insulation layer.
5.When the sewage pump idle, we need to drain the water within the sewage pump to add water when used.
The above content is the summary of sewage pump maintenance, and prevent the sewage pump freezing in winter, hoping to be helpful to the majority sewage pump users.