A sewage pumping station including a sump and above the sump a machinery compartment. A pair of sewage pumps and a priming chamber for holding sewage are provided in the machinery compartment. A feed conduit extending from adjacent the base of the sump into the priming chamber provides for the flow of sewage into the priming chamber. A vacuum pump also mounted in the machinery compartment when actuated produces a subatmospheric pressure in the priming chamber effective to draw sewage from the sump into the priming chamber. The pair of sewage pumps have their inlet sides connected to the priming chamber and sewage in the priming chamber is used to prime these pumps.
Another sewage pump mounted in said machinery compartment having an inlet side connected to said priming chamber adjacent the base of the pump and a discharge side connected to said discharge conduit, sewage level sensing means operable to sense the level of sewage in said sump, and pump control means connected to said sensing means for starting up the sewage pumps on a rise in the level of sewage in said sump, said pump control means including an alternating switch means operable to actuate said pumps alternately on successive startups of the sewage pumps.
In sewage pumping stations, of the type that are embedded in the ground, for ease of maintenance and other reasons, the pump which handles the sewage may be located in a compartment disposed above the sump from which the sewage is drawn, rather than being submerged in the sewage. A pump having such an elevated position with respect to the liquid that it pumps presents a problem of priming. Embedded sewage-pumping stations generally operate unattended over long periods of time and for this reason any means for maintaining a primed state in the pump must be reliable and trouble-free.
Submersible pumps can be known from the name, the application of equipment in the water.
Submersible pumps in some ways, is a machinery and equipment absolutely not the lack.When use submersible pumps to start work, but also to comply with the operation of the submersible pump specifications and the terms of some of the instructions. Otherwise, there is no way to submersible pumps such equipment function fully reflected, and submersible pumps in daily operation, often a whole group of mechanical equipment into the deep water to start work.
The role of the submersible pump is extremely important, the complex is the land below the water raised to the ground, to provide people with daily drinking water use, belongs to the life of water, mine rescue, industrial cooling, irrigation, Sea water upgrade, ship transfer in the core facilities, can also be used for fountain landscape, hot water submersible pump for hot spring bath.
First, because the load of submersible pump is more heavy relative to the general pump, supporting the motor rated current is relatively large. Therefore, the choice of inverter to the motor rated current according to inverter rated current to be selected, not just just power matching;
Second, pay attention to the installation and environment, for the installation of the pump station and other relatively wet site to do the protection of the inverter. For example, to strengthen the PCB circuit board insulation protective paint processing, screw sheet metal parts of the protective treatment, and place the control box to use.
Third, the general depth of submersible pumps in about 100 meters, the inverter to pump the distance between the far. Therefore, in the course of the cable diameter to consider thickening to reduce line losses, matching output line reactor to reduce leakage current, the appropriate increase in inverter selection to compensate for power attenuation. In particular, non-clean pump impurity should be increased selection, not in the water load current is great.
Fourth, regular inspection and maintenance, the pump group to see whether the appearance of aging, sealing for leakage, for insulation measurement. The frequency changer also must carry on the regular inspection, the clean-up, guaranteed that can the good work. For, require no interruption of the occasion to make use of standby emergency control circuit to prevent the inverter status and cause downtime.
Fifth, good grounding is the foundation to stablly and reliablly operate, do not have a reliable ground in the case of the inverter can be considered not grounded. Do not use the ground as a ground wire to the ground terminal of the inverter. Do not connect the ground of the motor to the ground of the inverter.
Sixth, in order to safety, in many occasions in rural areas are using the leakage protection switch, if the leakage protection selection improper adjustment by the inverter leakage current will trip the phenomenon. At this point, you can consider the installation of the reactor or reduce the input carrier frequency, conditional considerations to install the output reactance, reduce harmonic current.
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.
Since the founding of our company, strict implementation of ISO9001: 2000 “quality management system requirements.” The face of increasingly fierce market competition, the company has always been the first to pursue quality management objectives, adhere to the quality of survival, quality and development of the enterprise approach, the company has improved the production and technical testing equipment to ensure that each factory pump. But also occasionally because of misuse of the customer, resulting in submersible pumps burned, there are related issues, the following reasons describe the burning of the submersible pump:
1.The flow and head.
Such as the choice of the lift is too high, but easy to burn the motor, be careful not to reverse the water when the reverse small, large current, the reverse will damage the motor windings.
2.The installation of submersible pumps
Submersible pumps do not sink into the mud, otherwise it will lead to poor heat and burn the motor winding.
3.Try to avoid low-voltage boot.
4.Do not let the pump long-term overload operation, do not smoke large amount of water, dehydration pump running time should not be too long, so as to avoid overheating and burned the motor. During operation, the operator must observe whether the operating voltage and current are within the value specified on the nameplate. If not, the operator should stop the motor, find the cause and rectify the fault.
5.Some submersible pumps need to add lubricating oil in the sealed room, or mechanical seals easily damaged, the motor is easy to burn due to water.
First, compare various suppliers program when select centrifugal pump, taking into account the premise of cost-effective as far as possible under the high efficiency of the program
Second, the presence of a number of professionals in the plant producer, the impact of industrial pump efficiency of key components such as impeller, pump, pump cover, flow guide (vertical long shaft pump), such as manufacturing quality supervision, Impeller wing, the water angle, the blade indexing, flow channel shape, finish quality control, so that delivery of products in the current production conditions of high efficiency products
Third, in the production site of the installation and commissioning process, to ensure that the basis of a solid pump, with the drive on the good, flexible before and after the valve switch, pipeline layout design reasonable, safe and feasible on-site control, monitoring instrumentation complete running accurate to ensure The operation of the pump can be monitored in real time
The last step is in the long-term operation of the pump to pay attention to the point of inspection equipment, abnormal situation immediately reflect the report, in the normal minor repair, overhaul cycle, the vulnerability should be checked and replaced to ensure long-term efficient pump safety Of the operation.
The working condition of submersible pump is that the water pump and motor are submerged into the water, and the pressurized water is led out by the outlet pipe after the water pump is running. The main advantages of submersible pumps are:
1.Compact structure, small size. Submersible pump operation requires all the potential water inside, no additional workspace, so do not have to build a pump house to install them, can save not a small economic expenditure;
2.Operation, installation, easy maintenance. Submersible pump submerged into the water inside, the installation of a large space, unrestricted, slightly larger weight submersible pumps are equipped with automatic lifting coupling device, mobile is very convenient;
3.Long-time stable work. Submersible pump shaft structure is special, pumps and motors are the same axis, the shaft size is short, the weight of the rotor components are light, when working without bearing much axial force, life expectancy is higher than other pumps;
4.The submersible pump in the water under the work is fully enclosed, there will be cavitation damage to the pump, but also do not irrigation water, is very convenient;
5.The vibration of the submersible pump almost has no noise, the unit’s temperature rise is very small, in the water inside the cooling cooling without considering these situations;
As the excellent performance of submersible pumps, widely used in domestic sewage discharge, factory wastewater discharge, mine sewage discharge, water conservancy projects and other fields.
First check the cause of the thermal protector damage. If the thermal protector damage is caused by stainless steel submersible pump failure, should immediately overtake and remove the submersible pump failure; if the thermal protection damage is due to the quality of the thermal protector caused by thermal protector or the use of time Caused by too long, you should replace the same model, the same specifications of the thermal protector.
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.