Well with submersible pump to use

Well used submersible pump mainly flooding and oil immersed two, both by the pump and motor composed of two parts. In order to ensure the normal operation of the pump, it must be carried out as follows. 1. Electric pump before use, the application of megger to check the motor insulation resistance, the minimum value of not less than 5 megohm. Check the method is to connect a megohmmeter on the electric pump cable terminal block, the other terminal connected to the motor housing, the megger, shake, observe the insulation resistance. 2. Check the cable to crack, abrasion and other phenomena, if damaged should be promptly replaced to prevent leakage. 3. Water immersion motor should open the irrigation bolts, filled with clean water, tighten the bolts, and then dive into the water. Oil immersed motor, such as the discovery of oil spills, seal components should be replaced before diving into the water. 4. Pumping into the water before the pump should be filled with water pump, empty 1-2 minutes, and start 2 times, check idling and start normal. If you turn the opposite, the two-phase wiring can be exchanged. 5. Check whether the crack Yang pipes, the connection is solid. 6. Do not pull the pump when diving into the water or lifting, in order to avoid damage to the cable or the joint at the disconnect. 7. The supply voltage should be controlled within 5% of the rated voltage. If the voltage is too high or too low, the motor will be damaged. 8. Electric pump into the water should be vertical, not diagonal. 9. Pumps shall not be transported more water or mud sediment. Flooding motor should always clean the motor cavity sand, replace the motor cavity of water. 10. The actual pump lift should be within the rated head of 0.8-1. This can improve the efficiency of electric pump, saving, to avoid motor overload operation, extend the service life. 11. After the electric pump, it should be cleaned, coated with anti-rust oil on the metal surface and stored in a dry place vertical. Flooding motor should also be placed within the clean water motor.

Self Tapping Screws

Because of its self forming or tapping the thread matching it, it has high anti loosing ability in combination and can be disassembled. In the small screw, its size, thread type, head type, drilling performance, in the engineering use of high tension, single, unilateral combination features almost unlimited. Self tapping materials can be divided into carbon steel and stainless steel, of which 1022 medium carbon steel is the main material.

1: According to the different head, it can be divided into: round head, flat head (i.e. countersunk head), top stigma, round top wide side head, big round head (i.e. big flat head), hexagon bearing hole head, hexagon bearing hole Huasi head, hexagon bearing hole Huasi head

Round head: it is the most commonly used head shape in the past

Flat head: it can replace the new design of round head and mushroom head. The head is low in diameter, and the peripheral circumference of the head is connected with the high edge of the characteristic, which makes it play a driving role for high-strength torque. It is slightly different from the hole head in head shape

Top column head: the diameter of the standard flat round top column head is smaller than that of the round head, but it is higher due to the groove depth. The smaller diameter increases the pressure acting on a small area, and can be closely combined with the flange and the increased surface layer. As the head is made in the drilling die set to ensure the concentration, they can be successfully applied to the holes in the internal drilling

Dome wide side head: due to the undercutting of the head to restrain and reduce the wear of the wire components, it is most commonly used in electrical appliances and tape recorders, providing an attractive design type for the middle and low head type with its more sufficient bearing surface

Big round head: also known as oval top wide edge head, is a low type, cleverly designed large diameter head. When the combined tolerance of additional function allows, it can be used to cover the metal plate hole with larger diameter. It can also be recommended to use flat head instead

Hexagon socket head: a kind of joint with the height of wrench head and the size of hexagon head. The hexagon is completely cold formed by the reverse hole mold, and there is an obvious depression at the top of the head

Hexagon socket head: such as the standard hexagon socket head, but at the same time, there is a socket face on the base of the head to protect the assembly from damage of the wrench. Sometimes the function of things is far more important than appearance

Hexagon head: This is a standard type of torque acting on the hexagon head. It has the feature of trimming sharp corners close to the tolerance range. It can be recommended for general commercial use. It can also be applied to various standard patterns and various thread diameters. Because of its necessary second process, it is more expensive than general hexagon socket

2: According to the groove type, there are four types: slotted head type (also called slotting), cross slotted head type, cross slotted head type, cross slotted compound slotted head type and meter slotted head type

3: According to the standard can be divided into: GB, DIN, ANSI, BS

Self Tapping Screws,Cross Self Tapping Screws,Big Head Self Tapping Screws,Phillips Pan Head Self Tapping Screws

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