CN2097299U - Differential pressure piston type balancer for axial force - Google Patents

Abstract

The utility model relates to a differential pressure piston type balancer for axial force, which is applicable to deep well submerged pumps and is characterized in that the balancer is arranged at the final stage exit port of a water pump. The utility model is composed of a cylinder block, a piston, and a plurality of groups of anti-friction bearing elements arranged in the inner cavity of the piston. A piston guide way and a partitioning segment in the cylinder block divide the cylinder block into a high pressure chamber and a low pressure chamber. When the water pump works, by utilizing the pressure difference between the top and the bottom of the piston, the piston is made to generate upward balance force by the anti-friction bearing elements arranged in the inner cavity of the piston, solving the balance problem of the deep well submerged pumps. Compared with the similar devices, the utility model has the advantages of no leakage, sediment resistance, wear resistance, long service life, improved efficiency of the pump, etc.

Description

Differential pressure piston type balancer for axial force

The utility model belongs to the water pump design field, is specifically related to a kind of differential pressure piston type balance unit of axial forces for multistage pump of deep well submerged pump.

When the design high-lift submersible pump, pump shaft is the insoluble key issue of artificer to equilibrium of forces always, traditional axial thrust balancing devices has Balance disc, balancing drum, equalizing orifice and methods such as thrust bearing is set on motor, it is big that these methods exist leakage rate, influence the working efficiency of pump, when sediment charge in the medium of carrying is big, can quicken the wearing and tearing of counterbalance, cause the part short-term to be damaged, make pump shortcoming such as can't work.Chinese patent has announced that a kind of application number is the axial thrust balancing devices of CN86102781A, this structural type is that a plurality of thrust discs and a plurality of thrust bearing are contained between water pump and the motor, but under the multi-stage pump axial force effect, make elongated water pump spindle be in the depression bar state, coaxality can not guarantee, causes impeller port ring and lead the shell seal wears serious, and equalizing orifice is with ineffective, axial force will strengthen, and shorten the life-span of pump and submersible motor.In addition, the inventor's Chinese patent CN87211882 also belongs to a kind of axial thrust balancing devices, but only is applicable to high lift mining diving pump.

The purpose of this utility model provides a kind of good airproof performance, anti-silt, does not have and leak the differential pressure piston type balance unit of axial forces for multistage pump of wide adaptability.

The utility model is to realize like this, differential pressure piston type balance unit of axial forces for multistage pump is contained in the delivery side of pump place, form by cylinder body, piston, Sealing and some groups of equalizing features being located in the cylinder body, piston is contained in the lower end of the compartmented of inner chamber of cylinder block, have a low-pressure cavity that is communicated with compartmented top on the bearing rib, with the through hole of cylinder body exterior, plug screw is installed on the top of compartmented.Be provided with compartmented at inner chamber of cylinder block, its effect is with the piston seal body cylinder body to be divided into low-pressure cavity and hyperbaric chamber, when pump working, produce pressure difference between the piston seal body is upper and lower, make piston produce equilibrant upwards, make pump shaft produce pulling force upwards by the anti-friction bearing element that is located at internal piston, thereby reached the purpose of balancing axial thrust.

The piston of Equilibrator described in the utility model is by the piston seal body, the piston guide body, Sealing, the water filling bolt, gland seal device and be contained in some groups of anti-friction bearing elements on the pump shaft and composition such as aligning body, the nominal outside diameter D of piston seal body and cylinder body compartmented are Spielpassung, with Sealing 3 sealings, piston seal body top is provided with the water filling screw, the middle part is provided with anti-convulsion, and mesh with cylinder body, the bottom is connected with the piston guide body, the external circumference of piston guide has several axial pass troughs, and piston guide body diameter and inner chamber of cylinder block are Spielpassung, and gland seal device is equipped with in its underpart; The mm of fit diameter D(unit of the piston seal body of this device and cylinder body compartmented) be critical size of the present invention, as the m of rated head H(unit of pump) the needed upwards N of equilibrant F(unit) determine after, diameter D can obtain with following formula: D=11.4

(mm), the anti-convulsion at piston seal body middle part and cylinder body engagement, the bottom is connected with the piston guide body, and the differential pressure sealing part is moved without spin, has good sealing property, anti-silt, does not have and leak; The external circumference of piston guide has several axial pass troughs, make high pressure water enter the top of piston guide body from groove, equate that with the pressure that guarantees piston guide body bottom pressure and top gland seal device is equipped with in the bottom of piston guide body, make liquid maintenance cleaning in the piston.

Every group of anti-friction bearing element that the utility model is contained on the pump shaft comprises thrust disc, anti-friction bearing, anti-friction bearing seat aligning body etc., thrust disc is fixed on the end of pump shaft 9, anti-friction bearing is fixed on the anti-friction bearing seat, the raised annular disc engages fixed on the spill sphere of anti-friction bearing seat bottom and aligning body top can make anti-friction bearing fully contact with thrust disc break-in face like this.When pump working, between about the piston seal body pressure difference is arranged, make piston produce equilibrant upwards, under the effect of this power, piston seal body and piston guide body move up, and drive the aligning body and also move, the aligning body promotes the anti-friction bearing seat upwards, at this moment some groups of anti-friction bearings are delivered to equilibrant on the thrust disc that is fixed on the pump shaft, reach balance of axial force.

The utility model is contained in some groups of anti-friction bearing elements on the pump shaft, a following anti-friction bearing should be equipped with in the bottom of certain the aligning body in the middle of it, the thrust disc of following anti-friction bearing and its below leaves the gap of 0.5-1.0mm, when its purpose is scurried on instantaneous for avoiding water pump spindle, thrust disc top and aligning body bottom direct friction.Several aligning bodies are stacked in the piston guide body, with the screw threads for fastening of piston seal body bottom.Some groups of anti-friction bearing elements be installed in group on the pump shaft count n can be according to F ₁The size and the bearing capacity of single anti-friction bearing determine.F ₁Greatly, then n is many more, as F ₁Little then n is few more.

Description of drawings:

Fig. 1 is a differential pressure piston type balance unit of axial forces for multistage pump mounting structure sectional drawing.

Label declaration:

1, plug screw 2, piston seal body 3, seal ring 4, low-pressure cavity 5, cylinder body 6, cylinder body compartmented 7, locking nut 8, lock washer 9, seal ring 10, piston guide body 11, thrust disc 12, axle sleeve 13, aligning body 14, following anti-friction bearing 15, key 16, anti-friction bearing 17, anti-friction bearing seat 18, gland seal device 19, pump shaft 20, axial pass trough 21, bearing rib 22, anti-convulsion 23, through hole 24, sealing gasket 25, water filling bolt 26, anti-turn bolt

In conjunction with the accompanying drawings embodiment is done further detailed description, differential pressure piston type balance unit of axial forces for multistage pump, by cylinder body 5, cylinder body compartmented 6, piston guide body 10, piston seal body 2, aligning body 13, pump shaft 19, thrust disc 11, anti-friction bearing and anti-friction bearing seat 16,17 compositions such as grade, be contained in the final stage outlet port of pump, piston is contained in the bottom of the cylinder body compartmented 6 of cylinder body 5 inner chambers, piston is by piston seal body 2, piston guide body 10, Sealing 3,9,24, water filling bolt 25, gland seal device 18 and the some groups of anti-friction bearing elements and the aligning body that are contained on the pump shaft 19 are formed, have on the bearing rib 21 of cylinder body 5 low-pressure cavity 4 that is communicated with compartmented 6 tops and with the through hole 23 of cylinder body 5 exterior, plug screw 1 also is equipped with on the top of compartmented 6; Several thrust disc 11 usefulness keys 15, axle sleeve 12, locking nut 7 and lock pad 8 and be fixed on the pump shaft 19.Thrust disc 11 is located in respectively on several anti-friction bearings 16, anti-friction bearing 16 usefulness screws are fastened on the anti-friction bearing seat 17, and together be located on the aligning body 13, the anti-turn bolt 26 that is fixed on the anti-friction bearing seat 17 is placed in the hole of aligning body 13, prevents that the anti-friction bearing seat from rotating.During some groups of anti-friction bearing elements, a following anti-friction bearing 14 should be adorned in the bottom of certain the aligning body 13 in the middle of it in assembling, leaves the 0.5-1.0 mm clearance with the thrust disc of its below.Aligning body 13 is fixed on by between piston seal body 2 and the piston guide body 10, the piston conductor has several axial pass troughs 20 to 10 excircle, and with cylinder body 5 inner chambers be Spielpassung, gland seal device 18 is equipped with in the lower end, piston seal body 2 tops of upper end are provided with water filling bolt 25, the middle part is provided with anti-convulsion 22, and meshes with cylinder body 5, and the top of piston seal body 2 is low-pressure cavity 4; The bottom is a hyperbaric chamber, cylinder body compartmented 6 is a Spielpassung with the D of piston seal body 2, Sealing 3 is housed between the two, when pump working, produce pressure difference between piston seal body 2 is upper and lower, make piston produce equilibrant upwards, make pump shaft 19 produce pulling force upwards by the anti-friction bearing element that is located at internal piston, thus the axial force that the ballast pump rotor produces.

The utility model compared with prior art has the following advantages:

1, adopt differential piston formula bascule at deep well submerged pump, according to force analysis, learn required equilibrant force after, can obtain by the area of determining the piston seal top.

2, pump shaft is in tension state, can guarantee the axiality of pump.

3, the anti-friction bearing element is installed in the airtight plunger shaft, and liquid does not flow in the chamber, makes anti-friction bearing element duty good.

4, differential pressure sealing place is moved without spin, and the upper and lower play of trace is only arranged when pump begins and quit work, and good seal performance, anti-silt, nothing are leaked, and are convenient to promote the use of.

Claims (4)

1, a kind of differential pressure piston type balance unit of axial forces for multistage pump, comprise cylinder body, piston, Sealing and be located at the interior equalizing feature of cylinder body, it is characterized in that differential pressure piston type balance unit of axial forces for multistage pump is contained in the final stage outlet port of water pump, piston is contained in the bottom of the compartmented 6 of cylinder body 5 inner chambers, have on the bearing rib 21 of cylinder body 5 low-pressure cavity 4 that is communicated with compartmented 6 tops and with the through hole 23 of cylinder body 5 exterior, plug screw 1 also is equipped with on the top of compartmented 6.

2, Equilibrator according to claim 1, the piston that it is characterized in that Equilibrator is by piston seal body 2, piston guide body 10, Sealing 3,9,24, water filling bolt 25, gland seal device 18, be Spielpassung with the nominal outside diameter D and the cylinder body compartmented 6 that are contained in some groups of anti-friction bearing elements composition piston seal bodies 2 on the pump shaft 19, and Sealing 3 is housed, piston seal body 2 tops are provided with water filling screw 25, the middle part is provided with anti-convulsion 22, and with cylinder body 5 engagement, bottom and piston guide body 10 link, piston guide body 10 excircles have several axial pass troughs 20, and with cylinder body 5 inner chambers be Spielpassung, gland seal device 18 is equipped with in its underpart.

3, Equilibrator according to claim 2, it is characterized in that every group of anti-friction bearing element comprises thrust disc 11, anti-friction bearing 16, anti-friction bearing seat 17, aligning body 13, thrust disc 11 is fixed on the end of pump shaft 19, anti-friction bearing 16 is fixed on the anti-friction bearing seat 17, the raised annular disc engages fixed on the spill sphere of anti-friction bearing seat 17 bottoms and aligning body 13 tops.

4, Equilibrator according to claim 3, it is characterized in that being contained in some groups of anti-friction bearing elements on the pump shaft 19, a following anti-friction bearing 14 should be adorned in the bottom of the aligning body 13 in the middle of it, the thrust disc of following anti-friction bearing 14 and its below leaves the gap of 0.5-1.0mm, several aligning bodies 13 are stacked in the piston guide body 10, with the screw threads for fastening of piston seal body 2 bottoms.

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