SB-DL vertical multistage centrifugal pump is a national patented product developed by our company, which is mainly used in high-rise water supply, fire fighting, spraying and pipeline water circulation system. The transport medium is 80°C below the water or the physical and chemical properties of similar water liquid. The patented product is basically the same as the existing traditional vertical multistage centrifugal pump in the nature and occasion of use, but historic changes have taken place in the main functions of operation reliability, service life, maintainability, etc., which fully improves the humanization level and reality of the product. Its main changes and characteristics are as follows:

　　◆1. The bottom water-lubricated bearing of the existing product is a wearing part. But can not see, can not touch, can not check its wear and other use conditions in daily operation, can only rely on listening to the sound and other experience to judge the good and bad. Exactly when it will be damaged can only be left to chance. If you hear a different sound, it is likely that other parts inside are also broken, so it is quite passive. If it is found that the damage needs to be repaired and replaced, it is necessary to disassemble the entire pipeline and disassemble it step by step, and 2 to 3 people are afraid to disassemble and install it in a day. The patented product is shown in Figure (1), and it is also necessary to repair and replace the water-lubricated bearing at the bottom. To remove the pipe and pump as described above, simply loosen the four screws from the lower part and lubricate the bearing housing (2) with the two additional top wires already in place. It can be replaced or measured immediately. Check the water-lubricated bearing (5) and bearing sleeve (4), etc., which only takes about 30 minutes for a single operator. Due to the special treatment of parts (5) and (4). Therefore, not only the replacement and maintenance is extremely convenient, but also the service life of this wearing part is longer, and the reliability is also improved. Therefore, it can be said that this key weakness of the existing traditional vertical multistage pump is gone forever.

　　◆2. The pump shaft of the existing old products is 45 carbon steel, and several ordinary steel bushings are installed on its shaft, two kinds of rust-prone parts are matched together, and some can not be removed until the maintenance and disassembly, and because the impeller and guide vane are cast parts of the same metal. The impeller runs at high speed in the guide blade hole, and when there is a problem with the upper and lower bearings, the impeller and the guide blade hole must collide. The consequences will lead to damage to the main parts of these pumps and even create a vicious cycle. The pump shaft of the patented product is all made of 3Cr13 tempered stainless steel, which is neither rusted nor easy to disassemble, and the strength and stiffness of this low-alloy steel after tempering is much better than the original 45 carbon steel pump shaft. And in the guide vane (10) and impeller (8) rotating mouth ring hole inlaid with a set (7)(9), so that it becomes the impeller running support, coupled with water lubrication, even if the impeller and the support collide or friction, will also play a protective role, and will not damage, even if the upper and lower bearings are problematic within a time will not damage the impeller (8) and guide vane (10) and other major parts. These two practical measures and the new structure have completely changed the unreliability of the existing old products. If it's for fire fighting it's - reliable. Improving security is particularly important.

　　◆3, the existing old products of the water seal is mostly asbestos, the use of water leakage, although some also changed to mechanical seal, but because it is in the original position of the change. There is no corresponding change in its various structures, resulting in insufficient water circulation cooling around the end friction plane of the dynamic ring and the static ring of the mechanical seal, although the mechanical seal has been changed to a short service life, but it is not easy to replace. This product completely solves the problem of using mechanical seals, and has a continuous cooling water source around its running friction plane, which makes the service life of the same mechanical seal exponentially longer. Therefore, this product can ensure that the continuous operation of 12,000 hours of watertight. If used in fire fighting and spraying, mechanical seals can be replaced almost for decades.

　　◆4. (A) All pumps below 4-22KW of this product use plum blossom coupling. The plum-shaped elastic block is made of rubber and plastic material. Wear-resistant and elastic, both ends of the plum flower coupling is made of ductile iron or precision cast steel processing, good coaxial degree, high transmission efficiency, good reliability, long life. The motor needs to be lowered when the upper bearing and mechanical seal are replaced. (B) All pumps above 4-30KW are used. In the middle and lower three sections of the pin coupling, the need to replace the upper bearing and mechanical seal does not need to lift the motor, just remove the middle coupling to separate the motor from the pump shaft, can be removed step by step to replace the bearing or mechanical seal. (C) To remove the upper two bearings just loosen the 4 screws (15) on the end face of the bearing seat (14). Then use two screws that have been screwed to the top of it. Screw down until the top pull out the bearing seat and bearing, and then replace the bearing or grease. If you want to replace the mechanical seal, loosen the four screws on the upper end of the mechanical seal seat (24) in the same way, and then screw the two top wires already in the mechanical seal seat to pull out, and then you can take out the mechanical seal dynamic and static rings, the spring and mechanical seal shell - generally do not need to remove or replace. And only need to replace its dynamic and static rings.

　　◆5, in order to facilitate the replacement of the bottom water-lubricated bearings, although the pump bottom maintenance height is increased than the existing old products, because the new design cancelling the original packing rack of the old product, which is about 200 mm high, the total height of the same specification products is older than the existing

　　Lower product. Better center of gravity. It is best not to use anchor bolts when installing this product. No holes in the foundation, just a square. The plane cement foundation with a height of 150~ 200 mm can be released 100~ 150 mm around the plane size than the external size of the product footing. Four 120 X 150X 18(thick) rubber cushioning pads are inserted into the four corners of the product foot respectively, which is convenient, stable and reliable.

　　◆6. All the motors of this product are equipped with YE3-B5-4 vertical national standard motor, the insulation class is F, the technical indicators of the motor are higher than the ordinary Y series motor, strong versatility, low noise, long service life. This product is all equipped with four pole low speed motor, its power range is: 1.5 ~ 160KW. If you need to change the motor bearing, you can find the required bearing type and specification as long as you check the motor model and power.- General motor bearings are injected with special grease for motor bearings. Users can refer to the injection of molybdenum disulfide grease when refueling themselves.