CN215890506U - Submersible sand pump - Google Patents

Abstract

The utility model discloses a submersible sand pump, which comprises a motor and a centrifugal pump body, wherein the motor comprises a stator, a rotor, an upper bearing seat, a lower bearing seat, bearings at two ends, a motor shell, a lifting handle and a connecting screw rod for connecting the upper bearing seat and the lower bearing seat, the lower bearing seat is provided with a mechanical sealing cavity and a sealing cover, the double-end mechanical sealing is arranged in the mechanical sealing cavity, a sand-proof sealing ring is arranged at the central shaft position outside the sealing cover, the centrifugal pump body comprises an impeller and a pump volute, a sand-isolating disc is arranged between the motor and the centrifugal pump body, a radial separating rib is arranged in the inner cavity of the sand-isolating disc, a sand discharge port leading to the outside is arranged at the outermost edge position between two adjacent radial separating ribs, a sand-isolating sealing ring is arranged at the shaft hole position of the outer cavity of the sand-isolating disc, and a flange is arranged at the position close to the shaft hole at the back of the impeller, and the flange seals and blocks the sand-isolating sealing ring. The utility model has the advantages of reducing the damage of fine sand to the seal of the water pump, prolonging the service life of the motor and the submersible pump and reducing the use cost.

Description

Submersible sand pump

Technical Field

The utility model relates to a submersible electric pump, in particular to a submersible sand pump.

Background

In the prior art, a submersible sand pump is converted from a sewage submersible pump, because the impeller, a volute, a rotating shaft, a seal and the like are worn greatly by pumping sand in water, the common sewage submersible pump can be used for pumping sand and is damaged quickly, the service life of the submersible pump is generally about three months, the impeller volute is generally seriously damaged, the lift flow is insufficient, or an external seal and an internal mechanical seal are forced to be separated by fine sand, water leakage enters a motor to cause a fault, the fine sand is mainly used for frequently damaging the seal under external pressure, the motor is easily damaged, the service life of the common sewage submersible pump as the submersible sand pump is short, the use cost is high, and how to prolong the service life of the submersible sand pump is the technical problem to be solved at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a submersible sand pump which can reduce the damage of fine sand to the seal of the water pump, prolong the service life of a motor and a submersible pump and reduce the use cost.

In order to solve the technical problems, the technical scheme of the submersible sand pump is as follows: the submersible sand pump comprises a motor and a centrifugal pump body which are connected together, wherein the motor comprises a stator, a rotor, an upper bearing seat, a lower bearing seat, bearings at two ends, a motor shell and a lifting handle, and a connecting screw rod which is connected with the upper bearing seat and the lower bearing seat and is positioned outside the motor shell, the lower bearing seat is provided with a mechanical sealing cavity and a sealing cover which is used for connecting the mechanical sealing cavity in a sealing way, the double-end mechanical sealing is arranged in the mechanical sealing cavity, a sand-proof sealing ring is arranged at the position of a central shaft outside the sealing cover, and the centrifugal pump body comprises an impeller and a pump volute which are connected with a rotor output shaft, and is characterized in that: a sand separating plate is arranged between a motor and a centrifugal pump body, an inner cavity of the sand separating plate is provided with radial separating ribs which are uniformly distributed on the circumference, a sand discharging opening leading to the outside is arranged at the outermost edge position between two adjacent radial separating ribs in the inner cavity of the sand separating plate, a sand separating sealing ring is arranged at the shaft hole position of an outer cavity of the sand separating plate, a flange is arranged at the position, close to the shaft hole, of the back of an impeller, and the flange seals and blocks the sand separating sealing ring.

One of the preferred technical schemes of the utility model is as follows: the flange on the back of the impeller is embedded into the shaft hole of the sand-proof table outer cavity in a clearance fit mode, and the sand-proof sealing ring is installed inside the shaft hole of the sand-proof table outer cavity.

The second preferred technical scheme of the utility model is as follows: the back of the impeller is provided with a plurality of sand stirring blades, and a sand discharging gap is formed between the back edge of the impeller and the top of the inner cavity of the pump volute.

Further preferable as the second preferable embodiment of the present invention is: the back of the impeller is a conical inclined plane, and the sand shifting blades are arc-shaped and consistent with the rotation direction of the blades of the impeller.

The third preferred technical scheme of the utility model is as follows: in the sealing cover, a static ring gland is fixedly arranged at the mounting position of the static ring on the lower end face of the double-end-face mechanical seal, and the edge of the static ring on the lower end face of the double-end-face mechanical seal is pressed.

The fourth preferred technical scheme of the utility model is as follows: and a bearing gland is fixedly arranged at the outer end face of the lower bearing seat where the bearing is arranged, and is used for pressing the bearing outer ring.

The fifth preferred technical scheme of the utility model is as follows: and a wear-resistant shaft sleeve is fixedly arranged at the matching position of the sand-proof sealing ring and the sand-isolating sealing ring on the motor output shaft.

The fifth preferred embodiment of the present invention is further preferably: and a wear-resistant ceramic layer is also laid on the outer surface of the wear-resistant shaft sleeve.

The sixth preferred technical scheme of the utility model is as follows: and a sand loosening drill is coaxially connected to the bottom of the impeller.

Further preferable as the sixth preferable embodiment of the present invention is: the sand loosening drill comprises a drill arm and a drill bit, wherein a central screw hole is formed in one end of the drill arm and is in threaded connection with the end portion of the motor output shaft, a bolt is arranged at the other end of the drill arm and is in threaded connection with the drill bit, the drill bit is conical with a downward pointed end, and shifting blades are uniformly distributed on the outer surface of the conical drill bit.

The utility model has the beneficial effects that: because a sand separation plate is arranged between a motor and a centrifugal pump body, an inner cavity of the sand separation plate is provided with a radial rib and a sand discharge port leading to the outside, a shaft hole position of an outer cavity of the sand separation plate is provided with a sand separation sealing ring, when a water pump runs, water and sand are mixed and enter from the bottom of a pump volute and are pushed and discharged by centrifugal force of an impeller, during the running process, partial fine sand flows along with pressure and accumulates and applies pressure to the position of the sand separation sealing ring at the axis of the outer cavity of the sand separation plate, once the sand separation sealing ring is accumulated to a certain degree, the sand separation sealing ring can be damaged, the inner cavity of the sand separation plate is balanced in pressure due to the sand discharge port, even if sand enters, the sand prevention sealing ring on a motor sealing cover can not be damaged, but after the sand separation sealing ring of the first stage is damaged, the fine sand can be pushed into different areas of the inner cavity of the sand separation plate by the radial rib due to the pressure, and all the fine sand in the inner cavity of the sand separation plate can be quickly pushed and discharged out of the sand separation plate according to the pressure, the sand-proof sealing ring on the motor sealing cover is prevented from being impacted, the safety of the motor is ensured, and the service life of the motor is prolonged; in order to further reduce the damage of the flowing fine sand to the first-stage sand isolating sealing ring, more improvements are made, including: the back of the impeller is provided with a flange seal to block a sand separation seal ring, so that direct impact of fine sand is reduced, if the flange on the back of the impeller is embedded into the shaft hole position of the sand separation plate outer cavity in a clearance fit manner, the sand separation seal ring is arranged in the shaft hole position of the sand separation plate outer cavity, so that the path of fine sand entering the sand separation seal ring is lengthened, the impact quantity of the fine sand is reduced, and meanwhile, the back of the impeller is provided with a conical inclined plane and sand shifting blades, so that the fine sand entering and accumulating in the sand separation seal ring area is greatly reduced; in addition, a static ring gland is arranged on the lower end face of the double-end-face mechanical seal, so that fine sand is prevented from entering and forcing open the static ring after the sand separation sealing ring is damaged, and the sealing effect is influenced; a wear-resistant shaft sleeve is fixedly arranged on the matching position of the sand-proof sealing ring and the sand-isolating sealing ring on the motor output shaft, so that the service life of the motor shaft is prolonged; the bottom of the impeller is coaxially connected with a sand loosening drill, so that when the electric pump is accumulated by sand after stopping, the electric pump is restarted to accelerate the loosening of the sand and reduce the starting resistance; all the improvements have the beneficial effects of reducing the damage of fine sand to the seal of the water pump, prolonging the service life of the motor and the submersible pump and reducing the use cost.

Drawings

The submersible sand pump of the present invention will be described in more detail with reference to the accompanying drawings.

Fig. 1 is a sectional view of a submersible sand pump of the present invention.

Fig. 2 is a sectional view showing a structure of a sand-isolating packing ring blocked by a flange of an impeller in the submersible sand pump according to the present invention.

Fig. 3 is a structural sectional view of the submersible sand pump of the present invention without a wear-resistant bushing.

Fig. 4 is a front view of a septum sand table of the submersible sand pump of the present invention.

Fig. 5 is a top view of fig. 4.

Fig. 6 is a front perspective view of fig. 4.

Fig. 7 is an inverted perspective view of fig. 4.

Fig. 8 is a front view of the impeller in the submersible sand pump of the present invention.

Fig. 9 is a left side view of fig. 8.

Fig. 10 is a top view of fig. 8.

Fig. 11 is a top view of fig. 10.

Fig. 12 is a front perspective view of fig. 8.

Fig. 13 is an inverted perspective view of fig. 8.

Fig. 14 is a front view of the bit of the sand loosening drill in the submersible sand pump of the present invention.

Fig. 15 is a left side view of fig. 14.

Fig. 16 is a top view of fig. 14.

Fig. 17 is a front perspective view of fig. 14.

Fig. 18 is an inverted perspective view of fig. 14.

Fig. 19 is a perspective view of fig. 1.

The figure shows that: the motor 1, the stator 11, the rotor 12, the upper bearing seat 13, the lower bearing seat 14, the mechanical seal cavity 141, the double-end-face mechanical seal 142, the seal cover 143, the sand-proof seal ring 144, the bearing gland 145, the stationary ring gland 146, the bearing 15, the motor housing 16, the handle 17, the connecting screw 18, the wear-resistant shaft sleeve 19, the wear-resistant ceramic layer 191, the centrifugal pump body 2, the impeller 21, the flange 211, the sand-shifting blade 212, the pump volute 22, the sand-isolating disc 3, the radial rib 31, the sand-discharging port 32, the sand-isolating seal ring 33, the sand-loosening drill 4, the drill arm 41, the drill bit 42, the central screw hole 43, the bolt 44 and the shifting blade 45.

Detailed Description

As shown in fig. 1 to 3 and 19, the submersible sand pump of the present invention has the following specific embodiments: the submersible sand pump comprises a motor 1 and a centrifugal pump body 2 which are connected together, wherein the motor 1 comprises a stator 11, a rotor 12, an upper bearing seat 13, a lower bearing seat 14, bearings 15 at two ends, a motor shell 16, a handle 17, and a connecting screw 18 which connects the upper bearing seat 13 and the lower bearing seat 14 and is positioned outside the motor shell 16, wherein the lower bearing seat 14 is provided with a mechanical seal cavity 141 and a cover 143 which connects the mechanical seal cavity 141 in a sealing way, a double-end mechanical seal 142 is arranged in the mechanical seal cavity 141, a sand-proof seal ring 144 is arranged at a central shaft position outside the cover 143, the centrifugal pump body 2 comprises an impeller 21 which is connected with an outlet shaft of the rotor 12 and a pump volute 22, a sand-separating disc 3 is arranged between the motor 1 and the centrifugal pump body 2, radial ribs 31 which are uniformly distributed on the circumference are arranged in the inner cavity of the sand-separating disc 3, and an outermost edge position between two adjacent radial ribs 31 is positioned in the inner cavity of the sand-separating disc 3, there is a sand outlet 32 to the outside, a sand-isolating seal 33 is provided at the position of the shaft hole of the outer cavity of the sand-isolating plate 3, and as shown in fig. 8-13, the back of the impeller 21 is provided with a flange 211 at the position close to the shaft hole, and the flange 211 blocks the sand-isolating seal 33. In this embodiment, the lower bearing seat 14, the sand-separating disc 3, and the centrifugal pump body 2 are all made of cast iron, wherein the sand-separating disc 3 is connected with the lower bearing seat 14, and the centrifugal pump body 2 is connected with the lower bearing seat 14, which is convenient for assembly, disassembly, and maintenance, wherein the bearings 15 at the two ends are ball bearings, and can be single bearings or double bearings according to the power of the motor, and the sand-preventing sealing ring 144 and the sand-separating sealing ring 33 can be lip-shaped sealing rings, as shown in fig. 1-3, a wear-resistant coating can be added or a wear-resistant shaft sleeve is fixedly installed at the matching position of the sand-preventing sealing ring 144 and the sand-separating sealing ring 33 on the output shaft of the motor 1, so as to avoid the damage of the motor shaft, and the flange 211 at the back of the impeller 21 is as close as possible to seal the sand-separating sealing ring 33, thereby reducing the direct impact of fine sand; insulating lubricating oil is filled in the cavity of the motor 1 and the mechanical seal cavity 141 to help the bearing 15 and the double-end-face mechanical seal 142 to lubricate and dissipate heat of the motor.

As shown in fig. 1 and 3, one of the preferred embodiments of the present invention is: the flange 211 at the back of the impeller 21 is embedded into the shaft hole position of the outer cavity of the sand-proof plate 3 in a clearance fit mode, and the sand-proof sealing ring 33 is installed inside the shaft hole position of the outer cavity of the sand-proof plate 3. In the embodiment, the path for fine sand to enter the sand isolating sealing ring 33 is lengthened, so that the impact of the fine sand is further reduced, and the sealing safety is guaranteed.

As shown in fig. 1-3 and 8-13, the second preferred embodiment of the present invention is: the back of the impeller 21 is provided with a plurality of sand-stirring blades 212, and a sand-discharging gap is formed between the back edge of the impeller 21 and the top of the inner cavity of the pump volute 22. In this embodiment, all the sand-stirring blades 212 extend radially from the axial center, and the number of the blades is preferably the same as the number of the blades of the impeller, and the shape of the blades can stir away the sand and mud accumulated on the back of the impeller according to the running direction of the impeller, and the sand and mud is thrown out along with the rotation centrifugal force of the impeller, and the sand and mud falls below the impeller from the sand-discharging gap between the back edge of the impeller 21 and the top of the inner cavity of the pump volute 22 and is pumped away, so that the impact on the sand-separating sealing ring 33 is reduced.

Further preferred as a second preferred embodiment of the present invention is shown in fig. 1-3, 8-13: the back of the impeller 21 is a conical inclined plane, and the sand-shifting blades 212 are arc-shaped and have the same rotating direction with the blades of the impeller 21. In this embodiment, be favorable to impeller back silt to be got rid of away fast more, further reduce the impact to separating husky sealing washer 33 fast.

As shown in fig. 1 to 3, the third preferred embodiment of the present invention is: in the sealing cap 143, a stationary ring pressing cover 146 is further fixedly mounted at a mounting position of the lower end face stationary ring of the double-end face mechanical seal 142, and presses an edge of the lower end face stationary ring of the double-end face mechanical seal 142. In this embodiment, fine sand is prevented from entering to force open the stationary ring after the sand isolating seal ring 33 is damaged, and the sealing effect is not affected.

As shown in fig. 1 to 3, the fourth preferred embodiment of the present invention is: a bearing gland 145 is fixedly arranged at the outer end face position of the lower bearing seat 14 where the bearing 15 is arranged, and the bearing outer ring is pressed. In this embodiment, be in order to prevent that the axial from strikeing in the twinkling of an eye when the water pump starts and arousing the axle to move, avoid influencing the sealed effect of terminal surface under the double mechanical seal 142 because of the axle moves.

As shown in fig. 1 to 2, the fifth preferred embodiment of the present invention is: a wear-resistant shaft sleeve 19 is fixedly arranged on the output shaft of the motor 1 at the matching position of the sand-proof sealing ring 144 and the sand-isolating sealing ring 33. In this embodiment, wear-resisting shaft sleeve 19 is the alloy steel bushing, increases this wear-resisting shaft sleeve 19 and can prolong the life-span of motor shaft, as long as change after wear-resisting shaft sleeve 19 wears out can continue to use, reduces product cost of maintenance.

As shown in fig. 1 to 2, a fifth preferred embodiment of the present invention is further preferred: and a wear-resistant ceramic layer 191 is also laid on the outer surface of the wear-resistant shaft sleeve 19. In this embodiment, the wear-resistant shaft sleeve 19 is a common brief steel sleeve, and laying the wear-resistant ceramic layer 191 on one side can further enhance the sealing effect and prolong the service life of the wear-resistant shaft sleeve 19, thereby reducing the use cost of the product.

As shown in fig. 1 to 3, the sixth preferred embodiment of the present invention is: a sand loosening drill 4 is coaxially coupled to the bottom of the impeller 21. In the embodiment, when the electric pump is accumulated by silt after the electric pump stops rotating, the electric pump is restarted to accelerate the loosening of the silt, and the starting resistance of the electric pump is reduced. If the user does not need the sand loosening drill 4 according to the use environment, the user can take off the sand loosening drill to replace the connection with the nut to lock the impeller 21, and the sand loosening drill is very convenient.

Further preferred as six preferred embodiments of the present invention are shown in fig. 1-3, 14-18: the sand loosening drill 4 comprises a drill arm 41 and a drill bit 42, wherein one end of the drill arm 41 is provided with a central screw hole 43 which is in threaded connection with the end part of the output shaft of the motor 1, the other end of the drill arm 41 is provided with a bolt 44 which is in threaded connection with the drill bit 42, the drill bit 42 is in a conical shape with a downward pointed end, and the conical outer surface of the drill bit is uniformly provided with shifting blades 45. In this embodiment, three spiral blades 45 are uniformly distributed on the conical outer surface, and when the central screw hole 43 at one end of the drill arm 41 is in threaded connection with the end of the output shaft of the motor 1, the impeller 21 is locked and fixed.

The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention, as long as the objects of the present invention are implemented by substantially the same means.

Claims (10)

1. A submersible sand pump comprises a motor (1) and a centrifugal pump body (2) which are connected together, wherein the motor (1) comprises a stator (11), a rotor (12), an upper bearing seat (13), a lower bearing seat (14), bearings (15) at two ends, a motor shell (16), a lifting handle (17), a connecting screw (18) which is connected with the upper bearing seat (13) and the lower bearing seat (14) and is positioned outside the motor shell (16), the lower bearing seat (14) is provided with a mechanical sealing cavity (141) and a sealing cover (143) which hermetically connects the mechanical sealing cavity (141), a double-end mechanical seal (142) is arranged in the mechanical sealing cavity (141), a sand-proof sealing ring (144) is arranged at the central shaft position outside the sealing cover (143), and the centrifugal pump body (2) comprises an impeller (21) and a pump volute (22) which are connected with an output shaft of the rotor (12), the method is characterized in that: install one between motor (1) and centrifugal pump body (2) and separate sand table (3), separate sand table (3) inner chamber and have that the circumference arranges even radial muscle (31) that separate, be in the outermost border position between two adjacent radial muscle (31) in separating sand table (3) inner chamber, have one to outside row's husky mouth (32), have one at the shaft hole position that separates sand table (3) exocoel and separate husky sealing washer (33), the back of impeller (21) is close to shaft hole position and has flange (211), and this flange (211) are sealed and are blocked and separate husky sealing washer (33).

2. The submersible sand pump of claim 1, wherein: the flange (211) on the back of the impeller (21) is embedded into the shaft hole of the outer cavity of the sand separation plate (3) in a clearance fit mode, and the sand separation sealing ring (33) is installed inside the shaft hole of the outer cavity of the sand separation plate (3).

3. The submersible sand pump of claim 1, wherein: the back of the impeller (21) is provided with a plurality of sand stirring blades (212), and a sand discharge gap is formed between the back edge of the impeller (21) and the top of the inner cavity of the pump volute (22).

4. The submersible sand pump of claim 3, wherein: the back of the impeller (21) is a conical inclined plane, and the sand shifting blades (212) are arc-shaped and consistent with the rotation direction of the blades of the impeller (21).

5. The submersible sand pump of claim 1, wherein: in the sealing cover (143), a static ring gland (146) is fixedly arranged at the mounting position of the static ring on the lower end face of the double-end-face mechanical seal (142) and presses the edge of the static ring on the lower end face of the double-end-face mechanical seal (142).

6. The submersible sand pump of claim 1, wherein: and a bearing gland (145) is fixedly arranged at the outer end face position of the lower bearing seat (14) where the bearing (15) is arranged, and is used for pressing the bearing outer ring.

7. The submersible sand pump of claim 1, wherein: and a wear-resistant shaft sleeve (19) is fixedly arranged at the matching position of the sand-proof sealing ring (144) and the sand-isolating sealing ring (33) on the output shaft of the motor (1).

8. The submersible sand pump of claim 7, wherein: and a wear-resistant ceramic layer (191) is also laid on the outer surface of the wear-resistant shaft sleeve (19).

9. The submersible sand pump of claim 1, wherein: a sand loosening drill (4) is coaxially connected with the bottom of the impeller (21).

10. The submersible sand pump of claim 9, wherein: the sand loosening drill (4) comprises a drill arm (41) and a drill bit (42), wherein one end of the drill arm (41) is provided with a central screw hole (43) which is in threaded connection with the end part of an output shaft of the motor (1), the other end of the drill arm (41) is provided with a bolt (44) which is in threaded connection with the drill bit (42), the drill bit (42) is in a conical shape with a downward pointed end, and shifting blades (45) are uniformly distributed on the outer conical surface of the drill bit.

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