Submersible Sewage Sludge Pump

A: 1. Compact structure, small floor space. The sewage pump works submerged in the liquid, so it can be directly installed in the sewage tank without the need to build a separate pump room for installing the pump and the motor. This can save a lot of land and construction costs. 2. Easy installation and maintenance. Small sewage pumps can be freely installed, while large sewage pumps usually come with an automatic coupling device for automatic installation. Installation and maintenance are very convenient. 3. Long continuous operation time. Since the pump and the motor are coaxial in the sewage pump, the shaft is short and the rotating components are light, so the load (radial) on the bearing is relatively small, and the service life is much longer than that of ordinary pumps. 4. No cavitation damage or water intake problems. Especially the latter point brings great convenience to the operators. 5. Low vibration and noise, low motor temperature rise, no pollution to the environment. Due to the above advantages, the sewage pump has been increasingly valued by people and its application range has become wider. It can now be used to convey various domestic sewage, industrial wastewater, construction site drainage, liquid feed, etc. It plays a very important role in various industries such as municipal engineering, industry, hospitals, construction, restaurants, and water conservancy construction. However, everything has two sides. For the sewage pump, the most crucial issue is the reliability. Because the sewage pump is used in a submerged environment; the conveyed medium is a mixture of some solid materials; the pump is very close to the motor; and the rotating components of the pump are in the same direction as the water pressure on the impeller. All these problems make the requirements for the sealing, motor bearing capacity, bearing layout and selection of the sewage pump higher than those of ordinary sewage pumps. To increase the service life of the sewage pump, most manufacturers in China and abroad have been trying to find solutions in the protection system of the pump, that is, when the pump has faults such as leakage, overload, overheating, etc., it can automatically alarm and automatically stop for maintenance. However, we believe that setting a protection system in the sewage pump is very necessary, as it can effectively protect the safe operation of the electric pump. But this is not the key point. The protection system is only a remedial measure after the pump fails, and it is a relatively passive approach. The key point should be to start from the fundamentals and completely solve the problems of sealing, overload, etc. of the pump, which is a more proactive approach. Therefore, we have applied the auxiliary vane impeller dynamic sealing technology and the pump's no overload design technology to submersible sewage pumps to greatly improve the pump's sealing reliability and bearing capacity, and extend the pump's service life.

A: The so-called auxiliary vanes counter-rotating body dynamic seal refers to installing an open-type vanes wheel coaxially and in the opposite direction on the backside of the rear cover plate of the pump's impeller. When the pump is operating, the auxiliary vanes wheel rotates along with the main shaft of the pump, and the liquid in the auxiliary vanes wheel also rotates together. The rotating liquid will generate an outward centrifugal force, which on the one hand presses the liquid flowing towards the mechanical seal area, reducing the pressure at the mechanical seal area. On the other hand, it prevents solid particles in the medium from entering the friction pair of the mechanical seal, reducing the wear of the mechanical seal's friction blocks and extending its service life. Besides serving as a seal, the auxiliary vanes wheel can also play a role in reducing axial force. In submersible pumps, the axial force mainly consists of the pressure difference force of the liquid acting on the impeller and the gravity of the entire rotating part. The directions of these two forces are the same, and their resultant force is the sum of the two forces. It can be seen that, under the condition of identical performance parameters, the axial force of submersible pumps is greater than that of general horizontal pumps, and the balance difficulty is greater than that of vertical pumps. Therefore, the reason why the bearings of submersible pumps are prone to damage is also closely related to the large axial force. However, if an auxiliary vanes wheel is installed, the pressure difference force of the liquid acting on the auxiliary vanes wheel is in the opposite direction to the resultant force of the above two forces. This can cancel out part of the axial force, thus playing a role in extending the service life of the bearings. However, there is a drawback to using the auxiliary vanes wheel sealing system, that is, a certain amount of energy is consumed on the auxiliary vanes wheel, generally around 3%, but as long as the design is reasonable, this loss can be reduced to the minimum.

A: 1. This series of pumps come in two types of installation: fixed and mobile. When using the fixed automatic installation method, the chain ropes should be threaded into the two lifting screw nuts or lifting plates respectively, and the pump should be lifted up and down. Then, slowly slide along the guide rail evenly and slowly until the automatic coupling is in place. When using the mobile installation method, first wrap the hose, and then lift the electric pump up and down using the chain ropes, paying attention not to use the cable as a rope to avoid danger. 2. Use a 500V megohmmeter to measure the insulation resistance between the same and the common ground of the electric pump motor. The value should be no less than 2 megohms. Otherwise, the motor stator winding should be dried. The drying temperature should not exceed 120℃. 3. Before using the high-efficiency sewage pump, carefully check whether the cable is damaged, whether the fastening parts are loose or fallen off, and whether the pump has any deformation or damage during transportation, storage, and installation. 4. Pumps without self-circulation cooling devices must not be exposed above the water surface for a long time to prevent the electric pump from overheating and being damaged. 5. Do not operate the pump at a low head for a long time (generally, the head used should not be lower than 60% of the rated head). It is best to keep it within the recommended operating head range to prevent the electric pump from burning out the motor due to overloading. 6. High-efficiency sewage pumps must be equipped with a fully automatic pump control cabinet under normal circumstances. Do not directly connect the power grid or use a switch to connect the power supply. Ensure the normal operation of the electric pump. 7. The grounding wire of the casing must be strictly connected in accordance with relevant regulations. To ensure personal safety during use, when the electric pump is running, do not install people to do underwater work or move nearby to prevent accidents in case the electric pump leaks electricity. 8. After connecting, the rotation direction of the high-efficiency sewage pump is clockwise when viewed from the water inlet. If the electric pump rotates in reverse, simply swap any two wires in the cable to change the connection position.