Components of the multi-stage pump include: stator, rotor, balance mechanism, shaft end sealing mechanism, sliding pin, bearing and sliding pin system. Let us Let's take a closer look at these components. I hope that the above introduction will help everyone.
1 stator part
Mainly from the bearing, the first cover, the inlet section, the guide vane, the outlet section, the tail cap and other parts are connected by tension bolts. The suction inlet of the inlet section, the outlet of the outlet section are vertically upward, and the inlet section of the pump The static sealing surface of the middle section and the outlet section is sealed by a metal surface with an "o"-shaped sealing ring. When the feed pump is disassembled, the sealing surface must be carefully protected, and the sealing of the vane cover and the middle joint surface is reversed. The three copper nails at the guide vanes are compressed by 0.6~0.8 mm when tightening the bolts.
2 rotor part
The structure of the rotor is closely related to the overall structure of the pump, operational stability and product performance, and the main manifestation is the way the impeller is mounted on the shaft. The feed pump impeller is slidably fitted to the shaft and the other is used to withstand the thrust force. The balance plate and the toothed pad and compression ring considering the thermal expansion, the shaft end sleeve, the rubber sealing ring, the retaining sleeve, the sleeve, the lock nut and the like.
3 balance mechanism
The multi-stage pump adopts the balance disc steering force and positions the rotor in the axial direction. The stability of the balance mechanism works closely with the reliability of the product operation and its service life. The balance mechanism consists of the balance disc, the balance sleeve, and the block. It is composed of shank and so on. It can balance 100% axial force, high sensitivity, and automatic adjustment ability when working conditions change. It will cause wear of balance plate and balance sleeve when starting, stopping and load change, so the number of starts should be minimized. Increase the hardness of the balance disc and balance sleeve end. In order to prevent the balance mechanism from grinding, the thrust bearing is added.
4 shaft end seal
The shaft end seal has become the biggest threat to the long-term continuous operation of the feed water pump. In order to overcome this weak link, the packing seal must be considered for good cooling of the stuffing box. The cooling water is introduced from under the first cover and the tail cover, and is led out from the top. The cover and the tail cover bushing are provided with fins. The cooling water is industrial temperature or tap water pressure of normal temperature is 0.1 MPa or more, the water temperature does not exceed 33 ° C, and the temperature difference between the inlet and outlet water does not exceed 10 ° C.
5 bearing parts
The bearing is directly related to one of the key components of the safe operation of the pump. Therefore, its structural form must be stable and reliable. The pump rotor is supported by two sliding bearings located inside the bearing body, and the bearing is lubricated with thin oil. When the adjusting screw at the lower part of the bearing body can be adjusted, the rotor is always in the center position. Each time the adjusting screw is adjusted, the positioning pin hole positioning should be re-made at the joint between the bearing body and the first cover and the tail cover.
6 sliding pin system
The legs of each section of the multi-stage pump are supported on the platen surface, and the four legs are fixed between the legs of the inlet and outlet sections and the platen to ensure that the horizontal planes of each section can maintain concentricity when heated, and the multi-stage pump is killed. The point is located at the inlet side of the pump, the multi-stage pump platen and the inlet section are provided with cross pins at the bottom legs, and the lower part has longitudinal pins to ensure that the multi-stage pump expands freely in the longitudinal direction to the outlet side, and the longitudinal pin in the lower part of the outlet section ensures the along Expansion of the longitudinal centerline.
