CN2032268U

CN2032268U - Mine submersible electric pump for explosion-proof and anti-silt

Info

Publication number: CN2032268U
Application number: CN 87216967
Authority: CN
Inventors: 于令新
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-12-25
Filing date: 1987-12-25
Publication date: 1989-02-08

Abstract

The utility model relates to a mine submersible electric pump for explosion-proof and anti-silt, which can reliably drain the underground sewerage with high solid content of the silt and the dust in coal mine. The technology is characterized in that an explosion-proof motor and a pump compose an integrative structure, and the inner cavity of the explosion-proof motor is filled with oil to make cooling. Thus, the utility model can ensure idle rotation without water or when the electric motor makes full load operation with being exposed out the water surface, the electric motor can not be overheating or be burned out; a shaft of the outside of a mechanical seal is provided with a sand fling cup with a radial groove or an oblique groove, which can make the electric pump reliably work normally when the solid content in the sewerage is as high as 10%; a volute casing is provided with a through hole. Thus the mine submersible electric pump for explosion-proof and anti-silt makes the axial water pressure of an impeller obtain reliable balance for a long time and avoids the problem that a bearing is easy to be damaged for large axial load.

Description

The anti-silt diving of mine anti-explosion motor-drive pump

The utility model is the anti-silt diving of an a kind of mine anti-explosion motor-drive pump, and it belongs to draining facility under the coal mine, is specially adapted to the colliery face and discharges the high sewage of solid content.

In the prior art, have a kind of vertical common permissible motor is sealed after, the bottom installing centrifugal pump at it is used for the colliery drainage underground.Its deficiency is owing to cancelled the huge energy loss that the external-cooling type fan of motor is pulled water with the elimination fan; the motor inner chamber is by air heat conduction and shell outer boundary water cooling like this, this kind structural type when sewage arrange timely shutdown when not being in anhydrous idling conditions (this is a recurrent situation under the coal mine) then motor because of heat conduction and cool off not that the good general is burnt.And when the water surface lower, motor all surfaces, but still when need continuing under rated flow and lift draining, motor also will cause overheated and burn.And, because receded disk impeller does not have equalizing orifice, or equalizing orifice is arranged but its diameter less (pump that is used for face is especially true), easily stopped up and ineffective by silt dust in the sewage, thereby cause the impeller axial hydraulic thrust can not balance, the axial load of bearing significantly increases, the damage of bearings that easily causes in service.The not anti-silt of draining facility under the prior art coal mine only allows that solid content (weight ratio) such as silt dust is 0.6%～2% in the water, can not satisfy under the coal mine solid content in the sewage up to 8%～10% requirement.

The purpose of this utility model is to overcome above-mentioned deficiency of the prior art, and proposes a kind of explosion-proof anti-silt diving motor-drive pump.The utility model is compared to existing technology: the oil-filled permissible motor of custom-designed submersible inner chamber, increased new function---anti-silt and not overheated, can in sewage, solid content work up to 10% o'clock normal reliable ground, can avoid burning the accident of motor winding, to satisfy the requirement of effluent discharge under the coal mine.

The purpose of this utility model can reach by following measure: the anti-silt of mine anti-explosion diving motor-drive pump is by cable, permissible motor, formed with coaxial pump and the mechanical seal of motor, it is characterized in that: (a), described permissible motor are set up the inner chamber that the rubber seal formation can be oil-filled, it is 8 to 15 millimeters through hole 8 that (b), described volute are offered diameter, and the assembling of (c), the rotor shaft place between permissible motor and pump has the husky ring of getting rid of of several grooves.

The purpose of this utility model can also reach by following measure:

Described motor-drive pump is characterized in that setting has 4 to 8 dark 3 millimeters, and the sand that gets rid of of wide 5 millimeters radial groove 22 encircles 7,

Described motor-drive pump is characterized in that setting has 4～8 dark 3 millimeters, and the sand that gets rid of of wide 5 millimeters oblique slot 23 encircles 7.

Prototype test proves that the utility model has following advantage compared to existing technology:

1, explosion-proof performance is safe and reliable.

2, anti-silt performance height is when solid contents such as silt dust in the sewage can the running of normal reliable ground up to 10% the time.

3, when anhydrous idle running or motor all surfaced and still turn round under rated flow and lift, motor is not overheated not to be burnt.

4, the through hole of offering on the volute has guaranteed that the impeller axial hydraulic thrust obtains balance all the time, can not cause damage of bearings.

5, compact structure, volume is little, and is in light weight, easy to use.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the erection drawing of a kind of specific embodiments of the anti-silt of the utility model mine anti-explosion diving motor-drive pump, this figure main pseudosection that draws.

Fig. 2 is the main pseudosection that gets rid of first kind of specific embodiment of husky ring.

Fig. 3 is the plan view of Fig. 2.

Fig. 4 is the main pseudosection that gets rid of second kind of specific embodiment of husky ring.

Fig. 5 is the plan view of Fig. 4.

Drawing sequence number explanation: the oil that 1 permissible motor inner chamber fills, 2 bearings, 3 stator iron cores, 4 rotor shafts, 5 staor winding, 6 mechanical seals, the sand that gets rid of of 7 troughs of belt encircles the through hole on 8 volutes, 9 volutes, 10 impellers, the preoral loop of 11 impellers, the back choma of 12 impellers, 13,14,18,19 rubber ○Xing Mifengquans, 15 rubber seal, 16 cables, 17 epoxy resin, 20 permissible motors, 21 pumps coaxial with motor, 22 get rid of the radial groove of Sha Huanshang, and 23 get rid of the oblique slot of Sha Huanshang.

The utility model is described in further detail as follows in conjunction with (accompanying drawing) embodiment: with reference to Fig. 1, custom-designed have blasting resistance structure and an oil-filled motor of inner chamber, be characterized in, explosion-proof of permissible motor located to set up O

shape rubber seal

13,14,18,19 to be sealed, rotor shaft 4 stretches out explosion-proof the inboard installing mechanical seal 6 at place, and the sand-throwing ring 7 of its outside installing fluting, this ring is that rubber is made, close-fitting together rotates with axle on axle.Motor stator winding 5 adopts the oil resistant insulating material.Oil-filled 1(of permissible motor inner chamber such as transformer oil).Motor adopts the direct inlet wire mode of cable (also can adopt outlet box), passes through casting resin---and epoxy resin 17 is with the cable core sealing, and the external diameter of cable 16 is again by rubber seal 15 sealings.The shaft extension end of motor 20 is directly installed the impeller 10 of pump 21, and the volute 9 of pump directly is fixed on the support flange of motor 20.Impeller 10 is not offered equalizing orifice, but the external diameter of choma 12 is designed to same size behind the external diameter of impeller preoral loop 11 and the impeller; 4 to 8 diameters of volute garden Zhou Kaishe on And choma 12 tops behind impeller are 8 to 15 millimeters through hole 8, and motor 20 is formed compact integrated vertical structure motor-drive pump with pump 21.

Motor 20 is custom-designed flameproof special types, and the purpose that it is sealed has two: one can make the permissible motor inner chamber oil-filled; Its two, can make the motor work that pulls the plug.The oil-filled effect of permissible motor inner chamber has two: one, and motor inner chamber oil pressure has balanced action to the motor external water pressure, can reduce the inside and outside fluid pressure differential of motor, improves the operating conditions of mechanical seal 6, is more conducive to mechanical seal and keeps not leaking; Its two, the motor inner chamber is oil-filled, has improved the heat radiation and the heat conduction condition of motor stator winding 5 and iron core 3 greatly, the oil-filled and product of getting stator specific electric load and stator current density when Electromagnetic Design of motor inner chamber is less than 1500A ²/ cmmm ²The time, not overheatedly in the time of can guaranteeing just that anhydrous idle running or motor all surface running at full capacity do not burn.

Rotor shaft 4 places assembling between motor 20 and pump 21 has the sand-throwing ring 7 of several grooves, and this ring rotates with axle, and its groove can be split into radial (seeing Fig. 2 and Fig. 3) or oblique formula (seeing Fig. 4 and Fig. 5).The effect of sand-throwing ring 7 flutings has two: one, and behind the fluting, solids such as silt dust all can be thrown out of under centrifugal action after entering in the groove, make it can not enter mechanical seal 6, guarantee that mechanical seal 6 is not subjected to sand erosion and causes leakage; Its two, the groove of sand-throwing ring 7 also produces corresponding lift when rotated, the lift size changes with the size of sand-throwing ring 7 diameters, this lift just can be offset the hydraulic pressure that enters mechanical seal 6, this has just further guaranteed the sealing of mechanical seal 6.

The preoral loop 11 of the impeller 10 of pump 21 is identical with the external diameter of the back choma 12 of impeller 10, so that the impeller axial hydraulic thrust in two choma outsides keeps balance, the axial hydraulic thrust of impeller port ring inboard then obtains balance because of the through hole 8 of volute 9 gardens on week with inside and outside hydraulic communication, the diameter of through hole 8 is 8 to 15 millimeters, quantity is 4 to 8, so just can not stopped up by the silt dust in the sewage, thereby the axial hydraulic thrust of balance impeller 10 that can be steady in a long-term, reduced the axial load of bearing 2 significantly, made that bearing is on-stream can not to be damaged.

Claims

1, the anti-silt of a kind of mine anti-explosion diving motor-drive pump, by cable 16, motor 20, formed with coaxial pump 21, the mechanical seal 6 of motor, feature of the present utility model is:

[a], described permissible motor 20 are set up rubber seal 13,14,15,18,19, the inner chamber that formation can oil-filled 1,

It is 8～15 millimeters through hole 8 that [b], described volute 9 are offered 4～8 diameters,

The assembling of [c], rotor shaft 4 places between permissible motor 20 and pump 21 has the husky ring 7 of getting rid of of several grooves.

2, according to the described motor-drive pump of claim 1, it is characterized in that setting has 4 to 8 dark 3 millimeters, the sand that gets rid of of wide 5 millimeters radial groove 22 encircles 7.

3, according to claim 1 or 2 described motor-drive pumps, it is characterized in that setting has 4 to 8 dark 3 millimeters, the sand that gets rid of of wide 5 millimeters oblique slot 23 encircles 7.