RU214330U1 - Centrifugal pump impeller - Google Patents

Abstract

The utility model relates to centrifugal pumps and can be used in oil engineering as part of multistage centrifugal pumps for pumping liquid, including in conditions of salt deposition. The technical result of the utility model is to increase the resistance of the impeller blades made of polymeric materials to the deposition of salts during operation, to increase the energy characteristics. The impeller of a centrifugal pump contains a drive disk with blades and a driven disk without blades, made of polymeric material. The blades are provided with ridges and locking protrusions mating with slots and locking holes on the disk without blades, while the height of the ridges is greater than the depth of the slots. The angle at the top of the ridges does not exceed 70°. The cross-sectional area of the grooves is equal to the cross-sectional area of the mating ridges. The angle of inclination of the generatrix of the fixing projections and fixing holes to the axis is in the range from 2 to 20°. 3 w.p. f-ly, 9 ill.

Description

The utility model relates to centrifugal pumps and can be used in oil engineering as part of multistage centrifugal pumps for pumping liquid, including in conditions of salt deposition.

Known from patent RU 2605487 design of the impeller, which has blades, the first closing disk and attached by welding to the first closing disk, the second closing disk. Each blade has a tip region where it contacts the second closing disc. At least one blade of all blades in the first portion of the crown region has a welded joint with the second closing disc, wherein at least one second portion of the crown region is free of a welded joint. One of the closing discs is made of a light-transmitting material, and the other of the closing discs is made at least partially of a light-absorbing material.

The closest analogue is the design of the impeller of a centrifugal pump, known from patent RU 89878. The impeller of a centrifugal pump contains a carrier disk with blades provided with protrusions located at their ends, interconnected with the grooves of the covering disk. All parts of the impeller are made of thermoplastic material. The protrusions of the carrier disk are made with a height greater than the depth of the grooves made deaf. The carrier and cover discs are provided with fixing elements, while the carrier and cover discs are interconnected by welding.

However, these designs have insufficient resistance to salt deposition on the impeller blades during operation, due to the presence of sagging at the welding points and defects that occur when they are removed. Low energy characteristics are possible due to the fact that the width of the wheel can change during manufacture, the lack of smooth interfaces at the junctions of the disk with the blades.

The technical problem is the lack of resistance to salt deposits on the impeller blades during operation.

The technical result of the utility model is to increase the resistance of the impeller blades made of polymeric materials to the deposition of salts during operation, to increase the energy characteristics.

The technical result is achieved by the fact that in the impeller of a centrifugal pump, containing a drive disk with blades and a driven disk without blades, made of polymeric material, ridges and locking protrusions are made on the blades, mating with grooves and fixing holes on the disk without blades, while the height ridges is greater than the depth of the grooves, the angle at the top of the ridges does not exceed 70°, the cross-sectional area of the grooves is equal to the cross-sectional area of the mating ridges, the angle of inclination of the generatrix of the fixing projections and fixing holes to the axis is in the range from 2 to 20°.

The inventive wheel has the following aspects of implementation.

Along the edges of the grooves, additional protrusions in the form of fillets are made.

The axial support on the driving disk is made in the form of ribs.

An additional blade ring is made on the driving disk of the impeller.

If the cross-sectional area of the grooves is equal to the cross-sectional area of the mating ridges, then at the same time a high connection strength is obtained, the absence of gaps and sagging, which can occur if the cross-sectional area of the grooves is larger than the corresponding area of the ridges, and as a result - the specified high energy characteristics at a nominal flow rate.

For ultrasonic welding, it is necessary to have a certain angle at the top of the ridges, not exceeding 70°. In this case, when exposed to ultrasound, the comb melts and fills the grooves in the counterpart. At large angles, melting may not occur, welding will be less efficient and less reliable.

Before welding, it is necessary to assemble two halves that make up the wheel, fixing protrusions and holes in the form of a truncated cone, in which the angle of inclination of the generatrix to the axis is in the range from 2 to 20 °, will ensure correctness and minimum assembly time.

If additional protrusions in the form of fillets are made along the edges of the grooves, then in this way we will get smooth mates at the junctions of the disk with the blades, less hydraulic losses, higher energy characteristics.

If the axial support on the drive disk is made in the form of ribs, for example, radial, then with such a design, the rigidity and strength of the connection between the drive disk and the hub will be higher, which is important when the impeller is made of polymer material. The reliability of work will increase.

The weight of the impeller made of polymer material is almost five times less than that of metal. An additional blade ring made on the driving disk of the impeller will allow optimizing the value of the axial force.

The essence of the utility model is illustrated in Fig. 1-9 showing:

fig. 1 - the impeller of a centrifugal pump in section;

fig. 2 - constructive version of the fixing protrusion on the blade;

fig. 3 - constructive version of the connection of the blades with the disk after welding;

fig. 4 - constructive option for fixing the impeller disks;

fig. 5 - blades on the drive disk;

fig. 6 - drive disk with blades in section;

fig. 7 - protrusion on the blades in the form of a comb;

fig. 8 - driven disk with grooves;

fig. 9 - drive disk with an additional blade crown and axial support in the form of radial ribs.

In FIG. 1-9 positions 1-11 are designated:

1. Lead disk.

2. Blades.

3. Driven disk.

4. Protrusion on the blade in the form of a comb.

5. Grooves.

6. Fixing protrusion in the form of a truncated cone.

7. Fixing hole.

8. A ledge in the form of a fillet.

9. The inner surface of the disk without blades.

10. Axial support in the form of radial ribs.

11. Additional blade crown.

The impeller of a centrifugal pump consists of two halves in the form of a driving disk 1 with blades 2 and a driven disk 3 without blades, made of polymer material. At the ends of the blades 2 there are protrusions in the form of ridges 4 with an angle at the top α and fixing protrusions 6 in the form of a truncated cone. The angle α is made not exceeding 70°.

On the inner surface 9 of the driven disk 3, grooves 5 and fixing holes 7 are made, which mate with the ridges 4 and the fixing protrusions 6 of the drive disk 1. The height of the ridges 4 is made greater than the depth of the grooves 5.

The cross-sectional area of the grooves 5 is made equal to the cross-sectional area of the mating ridges 4. The inclination angle β of the generatrix of the fixing projections 6 and fixing holes 7 to the axis is in the range from 2 to 20°.

Along the edges of the grooves 5, additional protrusions in the form of fillets 8 can be made.

On the drive disk 1, an additional blade ring 11 and an axial support in the form of radial ribs 10 can be made.

The impeller is made as follows.

When assembling the impeller of a centrifugal pump, the fixing holes 7 are aligned with the fixing protrusions 6. The ridges 4 are located in the grooves 5. Then the drive disk 1 and the driven disk 3 are finally connected using ultrasonic welding, during which the ridges 4 are melted, followed by filling the grooves 5 with molten polymer material.

Claims (4)

1. The impeller of a centrifugal pump, containing a drive disk with blades and a driven disk without blades, made of polymeric material, ridges and locking protrusions are made on the blades, mating with grooves and locking holes on the disc without blades, while the height of the ridges is greater than the depth of the grooves, characterized in that the angle at the top of the ridges does not exceed 70°, the cross-sectional area of the grooves is equal to the cross-sectional area of the mating ridges, the angle of inclination of the generatrix of the fixing projections and fixing holes to the axis is in the range from 2 to 20°. 2. The impeller according to claim 1, characterized in that additional protrusions in the form of fillets are made along the edges of the grooves. 3. The impeller according to claim 1, characterized in that the axial bearing on the drive disk is made in the form of ribs. 4. The impeller according to claim 1, characterized in that an additional blade ring is made on the driving disk of the impeller.

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