CN207064307U - A kind of structure for ensureing large vertical water pumps guide bearing lubrication with clean water - Google Patents

Abstract

It the utility model is related to a kind of structure for ensureing large vertical water pumps guide bearing lubrication with clean water, including guide bearing of pumps, pump shaft and its axle journal, pillar and hydrostatic sealing device, stuffing-box part, upper lid and vertical concentric adjusting apparatus with positioning spigot, pressure clear water feed pipe, the pillar pass setting hydrostatic sealing device at lid；Adjusting screw and parallels, small jack are provided between the seat of honour and concrete foundation, to adjust upper lid seam and water pump assembly vertical concentric；The stuffing-box part is installed on the middle part of lid, passes through seam precision positioning with upper lid, is rigidly connected, rubber rope sealing.The utility model will move water sealing device and move to outside the pump housing at the pump shaft of lubrication with clean water guide bearing of pumps top, sealing effectiveness is effectively ensured, it ensure that the water body pumped in the pump housing and its silt can not enter guide bearing gap, make guide bearing of pumps that there is good lubrication with clean water condition, reduce guide bearing and pump shaft journal wear, increase the service life.

Description

A structure for ensuring clear water lubrication of guide bearings of large vertical water pumps

technical field

The utility model belongs to the field of fluid machinery and relates to a large vertical water pump, in particular to a structure for ensuring the clear water lubrication of the guide bearing of the large vertical water pump.

Background technique

Large-scale water pumps in my country are mainly vertical, and generally only one guide bearing is installed, which is located in the guide vane body. The guide bearing is a key part of a large water pump, which plays the role of bearing the radial force of the rotating parts of the water pump and stabilizing the rotation of the impeller. The water-lubricated guide bearing of the water pump has the advantages of simple structure, low cost, good reliability, and no water pollution. There are two types of lubricated by river water and lubricated by clean water. For large vertical water pumps with an impeller diameter of about 2.0 m or more, the unbalanced radial force of the pump shaft is relatively large, so it should be lubricated with clean water. The gap between the clean water tank on the upper part of the traditional clear water lubricated guide bearing and the rotating pump shaft is sealed with a flat rubber and a stainless steel moving ring. As the water flows out from the outlet of the surrounding guide vane, when it passes through the rear water guide cone and the clean water tank, the flow section suddenly expands. The flat rubber on the top of the clean water tank and the sealing surface of the stainless steel moving ring form a still water area and backflow, and the sediment in the water body is accumulated here by the action of gravity, and enters the gap between the clean water tank and the guide bearing through the gap between the flat rubber and the stainless steel moving ring sealing surface , which acts as an abrasive to wear the bearing material and the journal, and part of the sand is also embedded in the bearing material, which in turn wears the journal. If the guide bearing wears too much or is damaged, it will cause the axis of the unit to swing more, the vibration will increase, and even the blades will collide with the casing, resulting in accidental shutdown.

Utility model content

The utility model aims at the problem that the water body and sediment pumped by the large vertical water pump are easy to intrude into the gap of the pump clear water lubricated guide bearing, and the guide bearing and the pump shaft journal are easy to wear, and proposes a structure to ensure the clear water lubrication of the large vertical water pump guide bearing .

In order to solve the above problems, the technical solution of the utility model is a structure for ensuring the lubricating water of the guide bearing of a large vertical water pump. The guide vane body, the protective tube and hydrostatic sealing device set outside the pump shaft, the stuffing box part used for the pump shaft to pass through the pump body seal, the upper cover and the vertical concentric adjustment device for installing and fixing the stuffing box part, used Water supply pipes for supplying pressure water required for lubrication;

The lower end of the protective tube is fixed and sealed with the upper surface of the guide bearing, and the protective tube is coaxial with the pump shaft. The upper end of the protective tube passes through the upper cover of the water pump to the fresh water tank at the lower part of the stuffing box. The protective tube is not fixedly connected with the upper cover. The protective tube A hydrostatic sealing device is installed between the upper cover and the upper cover; the upper cover is installed on the foundation concrete through a vertical concentric adjustment device, and the middle part of the upper cover is provided with a positioning stop for installing stuffing box parts; the water supply pipe is cleaned by the lower part of the stuffing box parts out of the box.

Preferably, the hydrostatic sealing device is composed of packing, split packing gland, adjusting bolts and nuts, the upper cover is provided with a stopper for installing packing, and the packing gland compresses the packing and is fixed on the upper cover by adjusting bolts and nuts. On the cover, the packing gland is split type.

Preferably, the vertical concentric adjustment device is composed of an upper seat, an adjustment screw, a pad iron, an anchor bolt and a small jack, the bottom of the upper seat is fixed on the foundation concrete surface through the adjustment screw, the pad iron, and the anchor bolt, and the outer side of the upper seat is passed through a small jack. The jack is positioned and fixed on the foundation concrete surface, and the upper cover and the upper seat are positioned by positioning pins, sealed and rigidly connected by rubber ropes.

Preferably, the stuffing box part is installed in the spigot in the middle part of the upper cover, and the stuffing box part includes a stuffing box body, a drain pipe, a packing gland, packing, a water seal ring, a water seal pipe, bolts, and nuts; the stuffing box body and The upper cover is precisely positioned by the spigot, rigidly connected by bolts and nuts flange, and sealed by rubber rope.

Preferably, the protection tube is split type.

The beneficial effects of the utility model are:

Compared with the traditional structure, for the large-scale vertical water pump of the muddy river water pumping station, the guide bearing of the water pump with the structure of the utility model is filled with externally pressured clean water, and the pressure of the clean water is greater than the pressure of the water body containing sediment in the external pump body to ensure the required lubrication. The clean water flow, the pump shaft water seal device on the upper part of the clean water chamber of the pump guide bearing is moved to the outside of the pump body, completely isolated from the pumped water containing sediment, which can effectively prevent the sediment in the pumped water from intruding into the gap of the pump guide bearing , has good clean water lubrication conditions, reduces the wear of the water pump guide bearing, prolongs the service life, and ensures the reliability and durability of the water pump clean water lubricated guide bearing; the vertical concentric adjustment device of the stuffing box can ensure that the gap between the stuffing box and the pump shaft journal is uniform , the packing is evenly stressed and sealed well, and the wear is small, ensuring the reliability and durability of the packing seal; the setting of the hydrostatic sealing device between the upper part of the protective tube and the upper cover can avoid the influence of structural size and installation errors.

Description of drawings

Fig. 1 is the general structural diagram of the utility model guaranteeing the clear water lubrication of the guide bearing of the large vertical water pump.

Fig. 2 is a structural diagram of the connection of stuffing box components and its vertical concentric adjustment device in the utility model.

Fig. 3 is a top view of the connection between the stuffing box part and the water pump upper cover in the utility model.

Fig. 4 is a structural diagram of the hydrostatic sealing device between the protective tube and the upper cover of the utility model (A-A sectional view in Fig. 2).

In the figure: pump shaft 1, guide bearing 2, guide vane body 3, protective tube 4, stuffing box part 5, stuffing box body 5-1, drain pipe 5-2, packing gland 5-3, packing 5-4, Water seal ring 5-5, water seal pipe 5-6, bolt 5-7, nut 5-8, bolt and nut 5-9, rubber rope 5-10, upper cover 6, vertical concentric adjustment device 7, upper seat 7- 1. Adjusting screw and pad iron 7-2, anchor bolt 7-3, small jack 7-4, positioning pin 7-5, rubber rope 7-6, hydrostatic sealing device 8, hydrostatic sealing packing 8-1, small packing Gland 8-2, adjusting bolt and nut 8-3, rear water guiding cone 9, water supply pipe 10.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

1-4 in the figure shows a structure to ensure the clear water lubrication of the guide bearing of a large vertical water pump. The protective pipe 4 outside the pump shaft is used for the hydrostatic sealing device 8 between the protective pipe 4 and the upper cover 6, and the stuffing box part 5 is used for the seal of the pump shaft 1 passing through the upper cover 6, and is used for adjusting the upper cover and packing The vertical concentric adjustment device 7 which is vertically concentric with the center line of the water pump unit is used for supplying the water supply pipe 10 for lubricating required pressure clear water.

The protection tube 4 is split type, its lower end is fixed and sealed with the upper end surface of the water pump guide bearing 2 bearing body, and is coaxial with the pump shaft, the upper end passes through the upper cover 6 to the bottom of the water tank of the stuffing box part 5, the protection tube 4 and A hydrostatic sealing device 8 is arranged between the upper cover 6 to ensure that the protective tube can expand and contract freely, and the inner wall of the protective tube and the surface of the pump shaft form an annular cavity.

Hydrostatic sealing device 8 is made up of water pump loam cake 6, hydrostatic sealing packing 8-1, small packing gland 8-2, adjusting bolt and nut 8-3, and small packing gland 8-2 is a split type.

The upper cover 6 is fixedly installed on the upper seat 7-1, the upper cover and the upper seat are positioned by the positioning pin 7-5, sealed and rigidly connected by the rubber rope 7-6, and the middle part of the upper cover is provided with a positioning stop for installing the stuffing box part 5 The vertical concentric adjustment device 7 includes an upper seat 7-1, an adjustment screw and a pad iron 7-2, an anchor bolt 7-3 and a small jack 7-4, and when the water pump is installed, the adjustment screw and the pad iron 7-2 , small jack 7-4 is placed between the upper seat and the concrete surface of the first phase of the foundation, and is used to adjust the vertical concentricity of the seam in the middle of the loam cake 6 and the center line of the water pump unit.

Stuffing box part 5, including stuffing box body 5-1, drain pipe 5-2, packing gland 5-3, packing 5-4, water seal ring 5-5, water seal pipe 5-6, bolts 5-7, Nuts 5-8 and other parts, the stuffing box part 5 is installed in the middle seam of the upper cover 6, and the upper cover 6 is rigidly connected with bolts and nuts 5-9 flange, the seam is precisely positioned, and the rubber rope 5-10 Sealing to ensure the vertical concentricity of the stuffing box parts and the center line of the pump unit, the gap between the stuffing box and the pump shaft journal is even, the packing is evenly stressed and sealed well, and the wear is small.

The water supply pipe 10 is led out from the outside of the clean water tank at the lower part of the stuffing box part 5, and is staggered with the bolts and nuts 5-9 connected to the flange in the horizontal direction. The annular chamber between the pump shaft and the guide bearing clearance flows out. In this way, this structure completely isolates the external pressure water from the sandy water in the pump on the upper part of the bearing, which can effectively prevent the sediment in the water in the pump from invading the pump guide bearing, so that the water pump guide bearing has good lubricating conditions with clean water, reducing Minimal guide bearing and pump shaft journal wear for extended service life.

Claims (5)

1. A structure for ensuring clear water lubrication of the guide bearing of a large vertical water pump, including the pump shaft (1) and its journal, the guide bearing (2) sleeved outside the pump shaft, and the guide vane body ( 3), which is characterized in that it also includes a protective tube (4) and a hydrostatic sealing device (8) sleeved outside the pump shaft, a stuffing box part (5) used for the pump shaft to pass through the pump body seal, and used for installation and fixing The upper cover (6) of the stuffing box part, the vertical concentric adjustment device (7) of the upper cover, and the water supply pipe (10) used to supply the pressure water required for lubrication; The lower end of the protective tube (4) is fixed and sealed with the upper surface of the guide bearing (2), and the protective tube (4) is coaxial with the pump shaft, and the upper end of the protective tube (4) passes through the upper cover (6) to the stuffing box part (5 ) lower clean water tank, the protective pipe (4) is not fixedly connected to the upper cover (6), and a hydrostatic sealing device (8) is installed between the protective pipe (4) and the upper cover (6); the middle part of the upper cover (6) is provided There is a positioning spigot for installing the stuffing box part (5), and the upper cover (6) is fixed and installed on the foundation concrete surface through the vertical concentric adjustment device (7); the water supply pipe (10) is connected by the stuffing box part (5 ) from the outside of the lower clean water tank. 2. A structure for ensuring clear water lubrication of large vertical water pump guide bearings according to claim 1, characterized in that the hydrostatic sealing device (8) is composed of packing (8-1), packing gland (8-2 ) and adjusting bolts and nuts (8-3), the upper cover (6) is provided with a stopper for installing the packing (8-1), the packing gland (8-2) presses the packing (8-1) and passes through Adjusting bolts and nuts (8-3) are fixed on the upper cover (6), and the packing gland (8-2) is split type. 3. A structure for ensuring clear water lubrication of large vertical water pump guide bearings according to claim 1, characterized in that the vertical concentric adjustment device (7) consists of an upper seat (7-1), an adjustment screw and a pad iron (7-2), anchor bolts (7-3) and small jack (7-4), the upper cover (6) and the upper seat (7-1) are positioned by the positioning pin (7-5), the rubber rope (7 -6) Sealing and bolt rigid connection, adjust the upper seat (7-1) and the upper cover (6 ) The vertical concentricity of the middle spigot, the upper seat (7-1) is fixed on the foundation concrete surface with anchor bolts (7-3). 4. A structure for ensuring clear water lubrication of guide bearings of large vertical water pumps according to claim 1, characterized in that the stuffing box component (5) includes a stuffing box body (5-1), a drain pipe (5- 2), packing gland (5-3), packing (5-4), water seal ring (5-5), water seal tube (5-6), bolt (5-7), nut (5-8) ;The stuffing box part (5) is installed in the middle of the upper cover (6), the stuffing box part and the upper cover are precisely positioned by the seam, the bolts and nuts (5-9) are rigidly connected by the flange, and the rubber rope (5-10) is sealed . 5. The structure for ensuring clear water lubrication of guide bearings of large vertical water pumps according to claim 1, characterized in that the protection pipes (4) are split.