RU171633U1 - CENTRIFUGAL SLUDGE PUMP - Google Patents

Abstract

The utility model relates to centrifugal pumps with one-way suction for pumping abrasive-containing media, including for use in such difficult operating conditions as unloading mills, lifting and beneficiation of ore, transportation of concentrates and tailings of concentration plants. The utility model can be used on centrifugal slurry (soil) pumps with the so-called double-shell design. The technical result of the proposed utility model is to increase the wear resistance of the flow part of the pump. The centrifugal slurry pump contains an outer casing made of two parts having a vertical plane of the connector. In the outer casing there is an inner casing made of wear-resistant alloys and consisting of a street, front armored disk and rear armored disk. The impeller is mounted on a shaft in an inner housing. The pairing of the armored discs with the cochlea is made on a conical surface.

Description

The utility model relates to centrifugal pumps with one-way suction for pumping abrasive-containing media, including for use in such difficult operating conditions as unloading mills, lifting and beneficiation of ore, transportation of concentrates and tailings of concentration plants. The utility model can be used on centrifugal slurry (soil) pumps with the so-called double-shell design.

A known design of a centrifugal slurry pump designed for pumping various slurries with a high content of sand, sludge, soil, etc., containing an outer casing made of back and front halves having a vertical plane of the connector type GrAT, GrAR, PB, PBA. The pump has an outer casing and an inner casing located in it, consisting of a street, a front armored disk, a rear armored disk (the front armored disk can be made in one piece with the cochlea). The pump contains a bearing assembly with a shaft with an impeller mounted on it. The bearing assembly is mounted on a bed.

The closest analogue of the claimed utility model is a soil pump (RF patent No. 2405973, 12/10/2010), the design of which includes a front and a back cover, an outer casing with an internal casing in the form of a snail having front and rear protective armor plates, the rear one being made in one piece with the inner case, the shaft on which the impeller is fixed, the suction and discharge nozzles, characterized in that the thickness of the flange of the front armor plate at the interface with the impeller is equal to or greater than the thickness at the wheel, between the armored disk and the front wall of the impeller there is a toroidal gap, an elastic filler is placed between the housings and between the suction side cover and the armored disk, and the pump shaft seal is made of dovetail elastic material.

In this utility model, the pump shaft seal is made of elastic material in the form of an O-ring.

The main problem encountered when operating slurry pumps of the GrAT, GrAR, PB, PBA type when pumping abrasive mixtures is the insufficient resource of the parts of the flow part of the pump.

A significant factor in quick wear is the combination of armored disks with a cast on a cylindrical surface used in traditional pumps, which negatively affects tightness. The tolerance on the linear size of each of the mating parts is 1.1 mm, the gap can reach 3 mm. In the place of such a gap due to turbulence of the sludge intense wear is formed - the gap is worn out.

The technical result of the proposed utility model is to increase the wear resistance of the flow part of the pump.

The specified technical result is achieved due to the fact that in a centrifugal slurry pump containing an outer casing made of two parts having a vertical plane of the connector and an inner casing made of wear-resistant alloys and consisting of a street, front armored disk and rear armored disk, and the impeller mounted on the shaft in the inner case, the pairing of the armored disks with the cochlea is made on a conical surface.

The walls of the impeller of the pump may include jack blades.

In the design of the utility model, the pump for coupling the armored disks with the cochlea is carried out on a conical surface, which reduces the degree of wear and also ensures accurate assembly and disassembly, simplifying maintenance.

For a number of applications, an elastomeric lining is a better option than from hard alloys - the resource and wear resistance of the flow part is more than doubled. In the design of the utility model, an easily removable lining is attached to the body not with glue (or during vulcanization), as in traditional pumps, but with bolts, providing a snug fit and ease of maintenance. For applications with a low solids content, removable polyurethane lining is possible.

A shaft of a larger diameter than that used in traditional pumps (based on the pump size), provided in the utility model, with a minimum overhang reduces shaft deflection and increases the service life of bearings and stuffing box packing.

The design of the utility model provides for mounting the housing of the bearing assembly on the bed with four bolts, which provides easy maintenance. At the same time, the bed for the bearing assembly is solid, which increases its strength properties.

The use in the utility model of stiffeners on the outer casings allows to achieve high maximum pressure and achieve increased safety (up to 2020 kPa).

The main wear parts of a centrifugal sludge pump are the impeller, armored disks and ulits (or armored disks and linings of the outer casing). Impeller blades on the walls of the impeller reduce wear from centrifugal movement of abrasive particles in the street in the area between the impeller and the armor plate, preventing recirculation.

The reason for the increased wear of the traditional pump model is the presence of overflows inside the pump; to minimize this factor, a counter flow of water is created, which is supplied to the housing located in the interface zone. The flow rate of clean water is up to 20% of the pump flow. In a utility model, jack blades do not allow water to be supplied to this zone. Water supply is only required for the packing.

The proposed centrifugal slurry pump is presented in the drawings:

FIG. 1 - centrifugal slurry pump;

Figure 2 - pairing of armored disks with snails;

FIG. 3 - features of the device shaft of the bearing assembly;

FIG. 4 - fastening of the bearing assembly to the bed;

FIG. 5 is a view of a bed on which the bearing assembly is located;

FIG. 6 is a view of impeller blades;

FIG. 7 - centrifugal expeller seal;

FIG. 8 - mechanical seal.

Designations of the positions of the structural elements of the pump in the drawings:

1. Val

2. End cap

3. Bearing assembly housing

4. Bed

5. stuffing box

6. Back cover (housing)

7. Lining of the pump housing (polymer)

8. Rear armored disk (polymer)

9. Impeller

10. Front armored disk (polymer)

11. Lining of the pump cover (polymer),

12. Pump cover

13. Rear armored disk (metal),

14. Ulit (metal),

15. Front armored disk (metal).

16. The stiffening ribs of the body.

17. The place where the armored discs are connected to the pump housing.

18. Impeller blades of the impeller.

19.Expeller.

20. Expeller housing.

21. The short protrusion of the shaft-bearing assembly

22. Attachment points to the bed with bolted connections.

23. The front wheel of the impeller

24. Rear impeller disk

25. Impeller blade

26. Impeller adjustment

27. Bolt of fastening to the adapter

28. Shaft sleeve

29. O-ring

30. Seal

31. Adapter

32. Sealing chamber

33. Mechanical seal.

The pump has an outer casing with a back cover 6 and a front cover 12 and an inner casing located therein, consisting of a convoy 14, a front armored disk 15, a rear armored disk 13 if the inner casing is made of wear-resistant metal, or an inner casing consisting of a lining the front cover 11, the lining of the back cover 7, the front armored disk 10, the rear armored disk 13 in the case of the inner housing made of polymer (armored discs can be made in one piece with the coiled or lining of the cover / housing), ends w cover 2, the gland casing 5. The pump comprises bearing unit 21 to the shaft 1 with the impeller fixed thereon 9. The bearing assembly 21 is mounted on the frame 4 by four bolts 22.

The pairing of the armor plates 13, 15 with the cochlea 14 is carried out on the conical surface 17.

Easily removable lining 7 and 11 are attached to the body not with glue (or during vulcanization), as in traditional pumps, but with bolts, providing a snug fit and ease of maintenance. For applications with a low solids content, removable polyurethane lining is possible.

In a utility model, a supply pipe is excluded from the design of the pump. A new connection scheme has been implemented: supply pipe - pump housing - front armored disk. The implementation of the front armored disc is possible as a single unit with the supply pipe. The connection of parts in the flow part is carried out in the sequence: supply pipe - front armored disk - impeller. This ensures that the parts of the flow part are based on the common part - bed - pump housing. This eliminates the intermediate shaft support between the running and flowing parts of the pump. And also reduces the length of the gross line and the extension of the impeller console relative to the bearings, which reduces the load on the bearings and increases their service life.

In addition to the stuffing box packing, the utility model makes it possible to use centrifugal and mechanical seals. The centrifugal seal (Fig. 7) consists of small blades on the rear wall of the impeller and a second small wheel (expeller 19) installed in a separate chamber (expeller housing 20), behind the outer casing. A simple stuffing box or cuff (filled with grease) is used to prevent leakage when the pump is installed. During the operation of the expeller seal, a rotating sludge ring is created between the inner and outer diameters of the expeller 19. In this case, an impeller with rear vanes 25 must be used, since the expeller is not separately able to withstand high pressure inside the pump.

The reliability of the utility model allows the use of mechanical sealing (Fig. 8). A mechanical seal consists of a fixed (back) and a rotating (front) surface, pressed by mechanical or hydraulic pressure to prevent leakage. The seal cartridge 30 can be mounted on a utility model using standard adapters 31 and shaft sleeves 28.

The inventive centrifugal soil pump can be manufactured in the conditions of a machine-building enterprise specializing in this industry, using standard domestic or imported equipment, known technologies and materials. It can be widely used in industries related to construction work, mining and processing of minerals, where pumping of abrasive liquids is required.

The proposed set of essential features provides higher economic efficiency, less wear, high efficiency.

Claims (2)

1. A centrifugal slurry pump containing an outer casing made of two parts having a vertical plane of the connector, and an inner casing made of wear-resistant alloys and consisting of a street, a front armored disk and a rear armored disk, and an impeller mounted on a shaft the inner case, characterized in that the pairing of the armored discs with the cochlea is made on a conical surface. 2. The pump according to claim 1, characterized in that the walls of the impeller of the pump include jack blades.

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