Sewage pump is divided into submersible sewage pump, liquid sewage pump, vertical sewage pump and horizontal sewage pump. As the general site of the building is smaller, the displacement is not large, the sewage pump can give priority to the submersible sewage pump and submerged sewage pump, which submerged sewage pump is generally used in important places; vertical sewage pump and horizontal sewage pump required to set the interval The basis of the earthquake, self-filling suction, and occupy a certain site, it is less used in buildings.
Sewage pump discharge flow should be designed to select the second life of the drainage; when the displacement adjustment, according to the life of the largest hour of discharge selected. Fire elevator pool sewage pump flow rate of not less than 10L / s.
Sewage pump lift by lifting height, pipe loss calculation is confirmed, then add a certain free head. Free head should adopt 0.02 ~ 0.03MPa. Sewage pump suction pipe and outlet pipe flow rate should not be less than 0.7m / s, and should not be greater than 2.0m / s.
Public buildings should be used for each living drainage cistern as a unit to set up a spare pump, usually should be run interactively. Basement, equipment room, garage flushing the ground drainage, if there are two or more than two sewage pump equipment pump. When the catchment can not set the accident drain, the pump should have uninterrupted power supply; when you can close the drainage pipe, it may not provide uninterrupted power supply, but should set the alarm device.
When upgrading sewage and wastewater with larger impurities, the outlet pipes of the submersible sewage pump in different sumps should not be merged and discharged. When upgrading the general wastewater, the discharge pipes of submersible sewage pumps of different sumps may be merged and discharged according to the actual situation .
When two or more pumps share one outlet pipe, a valve and a check valve shall be installed on each outlet pipe of the pump. A single pump drainage may occur when the backflow should be set check valve. Do not allow the pressure drain and the building gravity drainage pipe merged discharge.
When the submersible sewage pump to enhance large debris, the submersible sewage pump should be equipped with a comminution device; when upgrading with more fibrous waste water, should adopt a large submersible sewage pump.
When the submersible sewage pump motor power is greater than or equal to 7.5kW or outlet diameter greater than or equal to DN100, the pump can be used to fix the auto-coupling device; when the submersible sewage pump motor power is less than 7.5kW or the outlet diameter is less than DN100, Tube mobile installation. Sewage collection pond submersible sewage pump drainage, water pumps should be set fixed auto-coupling device to facilitate pump maintenance.
Sewage pump should be able to automatically start and stop and manually start and stop the scene. Multiple pumps can be alternately operated in parallel, but also can be put into operation in stages.
More keyword search: Sewage pump
The solid collar needle roller bearing has compactstructure, small radial size and large load carrying capacity. It is suitable for the parts of which the radialoverall size is limited. It is also wide applied to thesituation where the shaft or housing has the swinging motion.In general, the needle roller bearing only withstands theradial load, not the axial load. When the shaft has axial load, itcan be used in combination with other bearings.However, it does not limit the axial shift of shaft or housing.The limiting rotational speed of needle roller bearing is lower.In high rotational speed of main machine, the needle rollerbearing with cage shall be chosen as far as possible.In compassion with other types of Needle Roller Bearings, under the situation of same radial size, the needle roller bearing has the large load carrying capacity and high rigidity but has highfriction torque.This kind of bearing has many series with different structure
and size. It is requested that the hardness, processing accuracy and surface roughness of shaft journal surface and
rolling surface of outer housing be same as those of the collarof bearing. As for the needle roller with G2 class, the diameter varies within 2μm in group. Except the full complement needle Roller Bearings, they have the rigid cages, which can correctly guide the parallel axis line of needle roller.
Solid Collar Needle Roller Bearings
Solid Collar Needle Roller Bearings,Solid Collar Roller Bearings,High Load Solid Collar Roller Bearings,Inner Ring Solid Collar Roller Bearings
Ningbo Ritbearing Imp & Exp Co.,Ltd. , https://www.nbbearing.de