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Major maintenance methods of submersible sewage pump
Source:未知|Popularity:0|release date:2020-12-19 16:23:46
1. Inspection of vulnerable parts: impeller, retaining ring, shaft sleeve and bearing seat of submersible sewage pump are vulnerable parts. First of all, the water pump should be removed to check whether the vulnerable parts are in good condition. It is forbidden to use damaged and unqualified spare parts.
2. Replacement of lubricating oil: open the oil hole screws in the sealing chamber and the motor respectively, drain all the lubricating oil in the sealing chamber and the motor, and replace the new oil to ensure the normal operation of the lubrication system.
3. Remove the pump shell to prevent rust: before using in spring, the top level pump shell should be disassembled, and the impeller should be turned on before starting, so as to prevent the parts from rusting and burning the motor. This maintenance is particularly important for water filled motors.
4. Ensure the sealing: the submersible sewage pump has strict requirements for sealing. If the oil quality is turbid and the water content is high when replacing the lubricating oil in the sealing chamber, the sealing box or sealing ring must be replaced or replaced to ensure its good sealing performance.
5. Dry motor: use 500 megohmmeter to measure the insulation resistance between the winding and the shell of the submersible sewage pump. If the resistance value is lower than 0.5 megohm, the moisture in the motor should be removed. The drying methods include: external drying method, electric current drying method and combined drying method. External drying method is to use external heat source for treatment. The commonly used measures are:
(1) blowing hot air: blowing hot air by using the blower of electric heater (small submersible sewage pump can use electric blower) to blow hot air to achieve the purpose of drying treatment;
(2) bulb baking: in the airtight box, several 200 watt bulbs are used for baking.
(3) in series, the dry resistance of the motor can not be adjusted in series with the dry resistance of less than 60%, and then the dry resistance of the motor can be adjusted to less than 60% of the dry current.
(1) blowing hot air: blowing hot air by using the blower of electric heater (small submersible sewage pump can use electric blower) to blow hot air to achieve the purpose of drying treatment;
(2) bulb baking: in the airtight box, several 200 watt bulbs are used for baking.
(3) in series, the dry resistance of the motor can not be adjusted in series with the dry resistance of less than 60%, and then the dry resistance of the motor can be adjusted to less than 60% of the dry current.
6. Ensure the bearing lubrication: for the water filled submersible sewage pump, check and replace the skeleton oil seal and lithium grease in the bearing chamber of the upper and lower covers. In order to ensure that the bearing works in good lubrication condition for a long time.
7. Check the bearing: check the upper and lower bearings of the motor. If the bearing is worn or the clearance is too large, the new bearing must be replaced in time. It is strictly forbidden to make use of the bearing "with defects". The inspection method is as follows: when the motor is running, the "click" sound is generated, and the period is directly proportional to the speed, and it is difficult to rotate the rotor by hand, which is a bit astringent or tear off phenomenon on the bearing raceway; if the intermittent "choking" sound is emitted in the bearing, there is an uncertain dead point when rotating the rotor by hand, which is generally the ball frame damage, inner ring fracture or ball breakage. In case of the above situation, the bearing must be replaced to avoid further damage.