CN106762785A - A kind of axial thrust balancing devices of pump - Google Patents

Abstract

The present invention provides a kind of axial thrust balancing devices of pump, including the pump housing, pump shaft and impeller, and two groups of impellers are symmetrically installed on pump shaft, and impeller is equipped with Curved runner, stator is equipped with the pump shaft of impeller back of the body liquid level side.Pump shaft is installed on the pump housing by bearing block, bearing sleeve is loaded on pump shaft upper end, and bearing block inside is close with pump shaft and be partly sequentially provided with bearing gland from top to bottom, bearing insert, ball bearing, end ring and sealing ring, pump shaft lower end is provided with external screw thread, and pump shaft lower end is provided with the locking nut for locking screw, impeller upper surface is provided with annular groove, and annular groove is provided with the balance pipe for communicating with the Curved runner water inlet, sealing ring is provided between the both stage impellers and housing of pump shaft both sides, serrate slot is provided between sealing ring and pump shaft both sides impeller back of the body liquid level.The beneficial effects of the invention are as follows reasonable in design, without installing balancing axial power apparatus, good balance effect, the long service life of pump again.

Description

A kind of axial thrust balancing devices of pump

Technical field

The present invention relates to a kind of pump configuration, more particularly to a kind of axial thrust balancing devices of pump.

Background technology

Multi-stage pipeline pump employs the additional stainless steel outer tube structure of vertical sectional type, can be directly installed on pipe In road, so as to reduce the pipeline fittingses such as valve, bend pipe, with compact conformation, floor space is small, installs The features such as facilitating, therefore such pump-type is received by the market, and is increasingly widely used in recent years.

All there is serious axial force in existing pipeline pump, because when impeller works, can be in impeller Upper generation axial force, the impeller of multi-stage pipeline pump is more, and its axial force problem also just becomes readily apparent from. The axial force of balance multi-stage pipeline pump substantially has two methods at present：One is using installation balancing drum or flat , can still there is larger remaining axle in the method for weighing apparatus disk and balance ring, the method using balancing drum is installed Xiang Li, may cause to damage to pump；And balancing frame slightly mistake in design and manufacture, will be in pump Start-up course in occur strength rotor vibration and balancing frame friction, make balancing frame turn into easy-to-damage element, The normal operation of pump cannot be ensured, the service life of pump is shortened, increase equipment cost, reduce production effect Rate.Two is to set balance cylinder at the back side of each running wheel, and is drilled on the back shroud of impeller, i.e., Axial force is discharged by way of balance pipe, it is not thorough that this method balancing axial thrust is also solved, and can deposit In remaining axial force.

The content of the invention

It is an object of the invention to design a kind of axial thrust balancing devices of pump, it without installing balance shaft again To power apparatus, simple structure, good balance effect, the long service life of pump.

The present invention solves its technical problem and is achieved through the following technical solutions：

A kind of axial thrust balancing devices of pump, including the pump housing, pump shaft and impeller, the pump shaft pass through bearing Seat is installed on the pump housing, and in opposite direction, two groups of size and number identical is symmetrically installed with the pump shaft Impeller, the impeller is equipped with Curved runner, and Curved runner water inlet is met on liquid level positioned at impeller, gone out The mouth of a river is located in the cavity of pump shaft and the pump housing, and stator is equipped with the pump shaft of the impeller back of the body liquid level side, Its suction casing be located at impeller the same side, the bearing sleeve be loaded on pump shaft upper end, and bearing block inside with Pump shaft is close and be partly sequentially provided with bearing gland, bearing insert, ball bearing, end ring from top to bottom And sealing ring, the pump shaft lower end is provided with external screw thread, and pump shaft lower end is provided with the lock for locking screw Tight nut, the impeller upper surface is provided with annular groove, and annular groove and the Curved runner water inlet The balance pipe for communicating is provided with, sealing is provided between the both stage impellers back of the body liquid level and housing of the pump shaft both sides Ring, serrate slot is provided between the sealing ring and the monosymmetric both stage impellers back of the body liquid level of pump shaft.

Further say, the ball bearing is deep groove ball bearing or angular contact ball bearing.

Further say, radial clearance is provided between the pump housing inwall and impeller ring wall.

Further say, relief chamber is additionally provided between the monosymmetric both stage impellers back of the body liquid level of pump shaft.

The present invention has the advantages and positive effects that：

1. by using above-mentioned technical proposal, using being subject in impeller and pump housing radial clearance liquid stream and rotation Pressure differential and balance pipe caused by centrifugal force, the most axial forces of balance, remaining axial force is through ball axle Peaceful weighing apparatus, it is possible to achieve complete equipilibrium falls axial force.

2. the design that the present invention passes through sealing ring and serrate slot, can increase sealing effectiveness, and utilize two-stage leaf Relief chamber between wheel, makes the raw divergence loss of liquid miscarriage for passing through, and increases resistance, so as to be effectively reduced The leakage rate of pump, improves the efficiency of pump.

Brief description of the drawings

Fig. 1 is structural representation of the invention；

In figure：The 1- pump housings, 2- pump shafts, 3- impellers, 4- bearing blocks, 41- bearing glands, 42- jewels Set, 43- ball bearings, 44- end rings, 45- sealing rings, 5- Curved runners, 6- stators, 7- lockings Nut, 8- annular grooves, 9- balance pipes, 10- sealing rings, 11- serrate slots, 12- radial clearances, 13- Relief chamber.

Specific embodiment

As shown in figure 1, the present invention provides a kind of axial thrust balancing devices of pump, including the pump housing 1, pump shaft 2 and impeller 3, pump shaft 2 is installed on the pump housing 1 by bearing block 4, and bearing block 4 is set in pump shaft 2 Upper end, and the inside of bearing block 4 and pump shaft 2 be close part be sequentially provided with from top to bottom bearing gland 41, Bearing insert 42, ball bearing 43, end ring 44 and sealing ring 45, the lower end of pump shaft 2 are provided with external screw thread, And the lower end of pump shaft 2 is provided with the locking nut 7 for locking screw.Direction is symmetrically installed with pump shaft 2 Conversely, two groups of impellers 3 of size and number identical, impeller 3 is equipped with Curved runner 5, Curved runner 5 Water inlet is met on liquid level positioned at impeller 3, and delivery port is located in the cavity of pump shaft 2 and the pump housing 1, impeller Stator 6 is equipped with the pump shaft 2 of 3 back of the body liquid level sides, the suction casing of stator 6 is located at the same of impeller 3 Side.The upper surface of impeller 3 is provided with annular groove 8, and is set on annular groove 8 and the water inlet of Curved runner 5 There is the balance pipe 9 for communicating, sealing ring is provided between the back of the body liquid level of both stage impellers 3 and housing of the both sides of pump shaft 2 10, it is provided with serrate slot 11 between sealing ring 10 and the monosymmetric back of the body of both stage impellers 3 liquid level of pump shaft 2. Radial clearance 12, the monosymmetric both stage impellers of pump shaft 2 are provided between the inwall of the pump housing 1 and the ring wall of impeller 3 Relief chamber 13 is additionally provided between 3 back of the body liquid levels.Ball bearing 43 belongs to rolling bearing, multistage for small-power Pipeline pump uses deep groove ball bearing, and angular contact ball axle is used for high-power (＞ 30kW) multi-stage pipeline pump Hold.

During work, the pressure that liquid is flowed into from the water inlet of Curved runner 5 of impeller 3 is P1, curvilinear flow The pressure of the delivery port outflow of road 5 is P2, and pressure is reduced to P1-P2；Radial clearance 12 is then flowed through, radially The inlet pressure in gap 12 is P3, and the outlet pressure of radial clearance 12 is P4, and pressure is reduced to P3-P4. Liquid flows out from radial clearance 12, flows through the cavity of pump shaft and the pump housing, balance pipe 9 and returns to impeller 3 The water inlet of Curved runner 5.Pressure medium and the product i.e. impeller 3 of compression area that the two ends of impeller 3 are subject to Axial force is identical suffered by two ends, so can balance the overwhelming majority axial forces, residual axial force by Ball bearing 43 undertakes, so that significantly more efficient balancing axial thrust, it is ensured that the normal operation work of pump, Extend the service life of pump, reduce equipment cost, improve production efficiency.

Embodiments of the invention have been described in detail above, but the content is only of the invention preferable Embodiment, it is impossible to be considered as limiting practical range of the invention.It is all to be made according to the present patent application scope Impartial change with improve etc., all should still belong within patent covering scope of the invention.

Claims (4)

1. a kind of axial thrust balancing devices of pump, including the pump housing, pump shaft and impeller, the pump shaft pass through Bearing block is installed on the pump housing, and in opposite direction, size and number identical is symmetrically installed with the pump shaft Two groups of impellers, the impeller is equipped with Curved runner, and Curved runner water inlet is met on liquid level positioned at impeller, Delivery port is located in the cavity of pump shaft and the pump housing, and stator is equipped with the pump shaft of the impeller back of the body liquid level side, Its suction casing is located at the same side of impeller, it is characterised in that：The bearing sleeve is loaded on pump shaft upper end, and Bearing block inside is close with pump shaft and be partly sequentially provided with bearing gland, bearing insert, ball axle from top to bottom Hold, end ring and sealing ring, the pump shaft lower end is provided with external screw thread, and pump shaft lower end be provided with for The locking nut of locking screw, the impeller upper surface is provided with annular groove, and annular groove and the song Line runner water inlet is provided with the balance pipe for communicating, the both stage impellers back of the body liquid level and the housing of the pump shaft both sides Between be provided with sealing ring, be provided with tooth between the sealing ring and the monosymmetric both stage impellers back of the body liquid level of pump shaft Shape groove.

2. the axial thrust balancing devices of a kind of pump according to claim 1, it is characterised in that：Institute Ball bearing is stated for deep groove ball bearing or angular contact ball bearing.

3. the axial thrust balancing devices of a kind of pump according to claim 1, it is characterised in that：Institute State and be provided with radial clearance between pump housing inwall and impeller ring wall.

4. the axial thrust balancing devices of a kind of pump according to claim 1, it is characterised in that：Institute State between the monosymmetric both stage impellers of pump shaft carry on the back liquid level and be additionally provided with relief chamber.