CN115013350A - Self-adaptive axial force balance auxiliary device for leakage-free centrifugal pump - Google Patents

Abstract

The invention relates to the technical field of centrifugal pumps, and discloses a self-adaptive axial force balance auxiliary device for a leakage-free centrifugal pump, which is arranged between an impeller and a pump cover of the leakage-free centrifugal pump and comprises a wear-resisting ring and a balance throttling ring, wherein the center of the wear-resisting ring is sleeved with a centrifugal pump shaft, the wear-resisting ring is connected with the impeller through a first countersunk head bolt, the balance throttling ring is positioned on the right side of the wear-resisting ring, the center of the balance throttling ring is sleeved with the centrifugal pump shaft, the pump cover is provided with an annular groove, the wear-resisting ring and the balance throttling ring are both embedded into the annular groove, and the balance throttling ring is fixed on the pump cover through a second countersunk head bolt. The invention has simple structure, low manufacturing cost and good balancing effect, can ensure that the circulating liquid in the non-leakage centrifugal pump works under the allowable minimum internal reflux amount, and reduces the internal reflux of the pump. Therefore, the potential faults of the leakage-free centrifugal pump are reduced, and the working efficiency of the centrifugal pump is improved.

Description

An Adaptive Axial Force Balance Auxiliary Device for Leak-Free Centrifugal Pumps

technical field

The invention relates to the technical field of centrifugal pumps, in particular to an adaptive axial force balance auxiliary device for a leakage-free centrifugal pump.

Background technique

At present, the axial force balance system of non-leakage centrifugal pumps, such as canned pumps and magnetic pumps, generally adopts solutions such as opening balance holes in the impeller, installing a balance wheel, using a balance bearing, symmetrical arrangement of the impeller, or a combination of the above solutions. Although the axial force balance scheme of the above centrifugal pump is relatively mature, there have always been shortcomings such as poor anti-cavitation (evacuation) ability, large internal return flow of the pump, affecting work efficiency, and equipment status being greatly affected by flow. Under stable working conditions, under the action of huge axial force and vibration in a very short time, the sliding bearing and thrust bearing of the equipment will be shattered, causing serious damage to the equipment and greatly increasing the maintenance cost.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings of the prior art, and to provide an adaptive axial force balance auxiliary device for a leakage-free centrifugal pump.

In order to achieve the above purpose, the technical solution of the present invention is: an adaptive axial force balance auxiliary device for a leakage-free centrifugal pump, which is arranged between the impeller and the pump cover of the leakage-free centrifugal pump, and is characterized in that: Grinding ring and balance throttling ring, the center of the wear ring is sleeved with the pump shaft of the centrifugal pump, the wear ring is connected to the impeller through the first countersunk bolt, the left side of the wear ring is provided with a slot, the impeller The bottom surface is clamped to the slot, the wear ring is provided with a guide hole, the guide hole is connected with the balance hole of the impeller, the balance throttle ring is located on the right side of the wear ring, and the center of the balance throttle ring Sleeve the pump shaft of the centrifugal pump, the pump cover is provided with an annular groove, the wear-resistant ring and the balance throttle ring are embedded in the annular groove, and the balance throttle ring is fixed on the pump cover through the second countersunk head bolt Above, the gap between the wear-resistant ring and the balance orifice ring is less than 0.05mm.

Further, a plurality of annular throttling grooves are provided on the side of the balance throttle ring close to the wear-resistant ring.

Further, a first sealing gasket is arranged between the wear-resistant ring and the bottom surface of the impeller, and a through hole passing through the balance hole is arranged on the first sealing gasket.

Further; a second sealing gasket is arranged between the balance choke ring and the bottom of the annular groove.

Beneficial effects of the present invention:

The invention has the advantages of simple structure, low manufacturing cost and good balance effect, so that the circulating liquid in the non-leakage centrifugal pump can work under the allowable minimum internal backflow rate, and the internal backflow of the pump is reduced. Therefore, the occurrence of potential failures of the leak-free centrifugal pump is reduced, and the working efficiency of the centrifugal pump is improved.

In the process of axial force balance, the present invention can make the axial movement of the impeller less than 0.2mm, while the axial channeling amount of the existing non-leakage centrifugal pump will reach about 2mm, so the invention can make the non-leakage centrifugal pump in cavitation or The phenomenon of shaft movement during evacuation is greatly reduced, the anti-cavitation or evacuation capability of the non-leakage centrifugal pump is improved, and the operation of the non-leakage centrifugal pump is effectively protected.

The invention is easy to install and use, can be installed during the manufacture of the centrifugal pump, can also be installed after the centrifugal pump is finished, and can even be used for compensatory repair as a maintenance component after the centrifugal pump is slightly damaged, so as to achieve a longer equipment operating cycle.

Description of drawings

Fig. 1 is the split figure of the present invention;

Fig. 2 is the structure schematic diagram after assembly of the present invention;

Figure 3 is a schematic diagram of the structure of the balance throttle ring.

In the figure: 1. Balance hole; 2. Impeller front cover; 3. Impeller rear cover; 4. Impeller balance throttle ring; 5. First sealing gasket; 6. Wear-resistant ring; 7. First countersunk head Bolt; 8. Balance throttle ring; 9. Balance seal ring groove; 10. Pump cover; 11. Impeller; 12. Impeller balance chamber cover plate; 13. Balance chamber; 14. Second gasket; 15. Section Two countersunk head bolts; 16, guide hole; 17, card groove; 18, annular groove; 19, pump shaft; 20, annular throttle groove.

Detailed ways

Example:

As shown in Figures 1 and 3, an adaptive axial force balance auxiliary device for a leakage-free centrifugal pump is arranged between the impeller 11 and the pump cover 10 of the leakage-free centrifugal pump, including a wear ring 6 and a balance Throttle ring 8, the wear-resistant ring 6 is centrally sleeved with the pump shaft 19 of the centrifugal pump, the wear-resistant ring 6 is fixedly connected to the impeller 11 through the first countersunk bolt 7 and rotates with the pump shaft 19, the wear-resistant ring 6 There is a card slot 17 on the left side, the bottom surface of the impeller 11 is engaged with the card slot 17, the wear ring 6 is provided with a guide hole 16, the guide hole 16 is connected with the balance hole 1 of the impeller 11, the The balance orifice ring 8 is located on the right side of the wear-resistant ring 6, the center of the balance orifice ring 8 is sleeved with the pump shaft 19, the pump cover 10 is provided with an annular groove 18, the wear-resistant ring 6 and the balance orifice ring 8 are embedded in the annular groove 18, the balance orifice ring 8 is fixed on the pump cover 10 by the second countersunk head bolt 15, the balance orifice ring 8 does not rotate with the pump shaft 19, the wear-resistant ring 6 and The gap between the balance orifice rings 8 is less than 0.05mm.

In this embodiment, preferably, a first sealing gasket 5 is provided between the wear ring 6 and the bottom surface of the impeller 11 , the first sealing gasket 5 is provided with a through hole passing through the balance hole 1 , and the first sealing gasket 5 is provided with a through hole penetrating the balance hole 1 . A countersunk head bolt 7 is connected to the impeller 11 through the wear ring 6 and the first sealing gasket 5 .

In this embodiment, preferably, a second sealing gasket 14 is provided between the balance choke ring 8 and the bottom of the annular groove 18 , and the second countersunk head bolt 15 passes through the pump cover 10 and the second sealing gasket 14 Connect the balance throttle ring 8.

In this embodiment, preferably, the balance throttle ring 8 is provided with a plurality of annular throttle grooves 20 on the side close to the wear ring 6 .

In this embodiment, preferably, the wear ring 6 is made of a hard material, and the balance throttle ring 8 is made of a soft material.

Working principle: The present invention is installed between the impeller 11 and the pump cover 10 , and the impeller balance seal ring 4 is embedded in the balance seal ring groove 9 on the pump cover 10 to form a throttling structure and form a balance cavity 13 . Due to the existence of a certain gap between the wear-resistant ring 6 and the balance orifice ring 8, the hardness of the processing materials of the two is different, and the arrangement of the annular throttle groove 20 on the annular surface of the balance orifice ring 8, the wear-resistant ring can be reduced to the greatest extent. The friction between 6 and the balance throttle ring 8.

Start the centrifugal pump and exclude other axial forces of the pump. The impeller 11 is subjected to three forces, namely the force directed to the right by the impeller front cover plate 2, and the impeller rear cover plate 3 plus the impeller balance chamber cover. Plate 12 points to the left side of the resultant force. Since the pressure per unit area of the impeller front cover plate 2 and the impeller rear cover plate 3 is the same, but because the force area of the impeller front cover plate 2 is larger than the force area of the impeller rear cover plate 3, the axial force of the impeller 11 is The impeller 11 will be out of balance, and the impeller 11 will tend to move to the right. At this moment, the balance chamber 13 will have high pressure liquid flowing into the vicinity of the impeller balance throttle ring 4 and the balance seal ring groove 9, and the pump shaft 19 cooling system. Medium-pressure liquid, these inflowing liquids can only flow into the impeller balance hole 1 through the gap between the balance throttle ring 8 and the wear-resistant ring 6 after they converge, and finally return to the inlet of the impeller 11 . When the impeller 11 moves to the right, the pump cover 10 is fixed. As the gap between the balance throttle ring 8 and the wear ring 6 decreases, the liquid outflow decreases, and the pressure in the balance chamber 13 increases. The pressure on the impeller balance chamber cover plate 12 will increase until it increases to the point where it is balanced with the pressure of the impeller rear cover plate 3 and the pressure of the impeller front cover plate 2, so that the axial force on the impeller 11 is stable. state. When the outlet pressure of the pump decreases, through the force analysis, the impeller 11 will tend to move to the left. At this time, the gap between the balance throttle ring 8 and the wear ring 6 will gradually increase, and the liquid outflow will increase accordingly. The pressure in the balance chamber 13 decreases gradually, and the pressure on the impeller balance chamber cover plate 12 decreases accordingly until the sum of the pressure on the impeller rear cover plate 3 is balanced with the pressure on the impeller front cover plate 2, so that the The axial force on the impeller 11 reaches a steady state, and the pump shaft 19 stops moving axially.

During the operation of the centrifugal pump, when the axial force is out of balance (the pressure changes), the axial force balance system repeats the above actions until it reaches a stable state. The axial movement of the impeller 11 during the balancing process is less than 0.2 mm.

The above-mentioned embodiments are only preferred solutions of the present invention, and do not limit the present invention in any form. There are other variations and modifications under the premise of not exceeding the technical solutions recorded in the claims.

In the description of the present invention, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying what is indicated. A device or element must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

Claims (4)

1. The utility model provides a balanced auxiliary device of self-adaptation axial force for no leakage centrifugal pump, sets up between the impeller of no leakage centrifugal pump and pump cover, its characterized in that: including wear-resisting ring and balanced throttle ring, the centrifugal pump shaft is cup jointed at the wear-resisting ring center, wear-resisting ring is through first countersunk head bolted connection impeller, the wear-resisting ring left side is equipped with the draw-in groove, impeller bottom surface joint draw-in groove, be equipped with the water conservancy diversion hole on the wear-resisting ring, the water conservancy diversion hole link up with the balancing hole of impeller, balanced throttle ring is located the wear-resisting ring right side, centrifugal pump shaft is cup jointed at balanced throttle ring center, the pump cover is equipped with the annular groove, wear-resisting ring and balanced throttle ring all imbed in the annular groove, balanced throttle ring passes through second countersunk head bolted connection on the pump cover, the clearance between wear-resisting ring and the balanced throttle ring is less than 0.05 mm.

2. The adaptive axial force balancing aid for a centrifugal pump without leakage of claim 1, wherein: and a plurality of annular throttling grooves are formed in one side, close to the wear-resisting ring, of the balance throttling ring.

3. The adaptive axial force balancing aid for a centrifugal pump without leakage of claim 1, wherein: and a first sealing gasket is arranged between the wear-resistant ring and the bottom surface of the impeller, and a through hole communicated with the balance hole is formed in the first sealing gasket.

4. The adaptive axial force balancing aid for a centrifugal pump without leakage of claim 1, wherein: and a second sealing gasket is arranged between the balance throttling ring and the bottom of the annular groove.

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