CN110836188B - Large submersible sewage pump - Google Patents
Large submersible sewage pump Download PDFInfo
- Publication number
- CN110836188B CN110836188B CN201911094349.5A CN201911094349A CN110836188B CN 110836188 B CN110836188 B CN 110836188B CN 201911094349 A CN201911094349 A CN 201911094349A CN 110836188 B CN110836188 B CN 110836188B
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- China
- Prior art keywords
- impeller
- pump
- cutting
- pump cover
- convex ring
- Prior art date
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- 239000010865 sewage Substances 0.000 title claims abstract description 29
- 238000005520 cutting process Methods 0.000 claims abstract description 64
- 238000007789 sealing Methods 0.000 claims abstract description 52
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 230000003068 static effect Effects 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 229910001220 stainless steel Inorganic materials 0.000 claims description 15
- 239000010935 stainless steel Substances 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 7
- 239000000523 sample Substances 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 description 14
- 230000009471 action Effects 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 8
- 238000009825 accumulation Methods 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000002265 prevention Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 238000009837 dry grinding Methods 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
- F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/106—Shaft sealings especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/001—Preventing vapour lock
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a large submersible sewage pump, which comprises a pump body, a closed impeller, an impeller nut, a pump seat, a rear pump cover, a sealing cavity, a mechanical sealing first and a submersible motor, and is characterized in that the inlet end of the lower end of the pump body is provided with a front pump cover, the impeller is a half-open double-blade impeller, the center of the front pump cover is provided with a liquid inlet, the upper end of the front pump cover is provided with an arc-shaped convex ring, two cutting static blades are arranged in the liquid inlet, the surface of the arc-shaped convex ring is provided with an involute groove, the involute shape of the groove extends from the inner end of the arc-shaped convex ring to the outer end along the surface of the arc-shaped convex ring, the front pump cover is abutted against the pump body through the adjusting screws arranged in the circumferential array, the front pump cover is fixedly connected with the pump body through the fastening bolts, the cutting static blade of the front pump cover is abutted against the cutting movable blade of the impeller, and the annular convex ring of the front pump cover is matched with the cutting edge face of the guide vane of the impeller to be abutted against and slidingly connected.
Description
Technical Field
The invention relates to the field of fluid machinery, in particular to a large submersible sewage pump which is anti-blocking, anti-air accumulation and reliable in sealing.
Background
As known in the prior art, the large submersible sewage pump consists of a pump body, a closed impeller, an impeller nut, a pump seat, a rear pump cover, a sealing cavity, a mechanical sealing first cavity and a submersible motor, wherein an output shaft of the submersible motor is fixedly connected with the pump shaft, passes through the mechanical sealing second cavity in the sealing cavity and then is in sealing connection with the rear pump cover, then passes through the mechanical sealing first cavity in the mechanical sealing first cavity and is fixedly connected with the impeller in the working cavity, the end part of the pump shaft is fixedly connected with the cover nut through the impeller nut, the periphery of the rear pump cover is fixedly connected with the sealing cavity in sealing manner, lubricating oil is arranged in the sealing cavity, the upper end of the sealing cavity is fixedly connected with a housing of the submersible motor, the lower end of the sealing cavity is fixedly connected with the pump body, the sealing cavity is fixedly connected with the pump shaft through a bearing, the upper end of the mechanical seal in the mechanical seal cavity is in contact sealing with the pump cover, the lower end of the mechanical seal cavity is in contact sealing with the end part of the impeller hub, the hub of the impeller is provided with a liquid return hole, the pump shaft in the mechanical seal cavity is sleeved with the mechanical seal cavity, the upper end of the mechanical seal is in contact seal with the rear pump cover, the lower end of the mechanical seal is in contact seal with the end part of the impeller to form a mechanical seal cavity, the mechanical seal cavity is internally provided with a seal cavity, prevent that liquid from getting into sealed intracavity, impeller import corresponds with the water inlet of the pump body lower extreme, pump body one side is equipped with the delivery port, and the substantive inadequacy of this kind of structure is:
1. Although the closed impeller adopts the design of enlarging the flow passage according to the characteristics of the sewage pump, the size enlargement of the flow passage is limited, and when the closed impeller encounters particles with the size larger than the flow passage, the closed impeller still can block the flow passage and cannot be discharged, and finally the pump is caused to fail.
Through searching, CN 208294831 discloses an anti-blocking semi-open impeller, although the flow passage can be enlarged, the following disadvantages still exist: when the non-sheared fiber enters the impeller, it hangs at the inlet vanes, thereby causing a slow blockage of the flow passage.
2. In the maintenance process, maintenance personnel often find that the phenomenon of burning out the mechanical seal-dry grinding in the mechanical seal-cavity occurs, so that the equipment maintenance rate is high, the service life is short, and the working efficiency is low.
3. Because the impeller is equipped with the back mouth ring with the pump body cooperation department, the back mouth ring can prevent that big granule from getting into a mechanical seal intracavity of pump chamber and influencing sealed life, but because dredge pump exhaust granule size is different, little granule can get into back mouth ring and pump body clearance along with water, causes partial granule card in back mouth ring and pump body clearance and leads to impeller rotation moment of torsion big, and then makes the submersible motor resistance increase influence the life of motor.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide the large-scale submersible sewage pump which has the advantages of novel structure, obvious cutting effect, stable pump operation, good sealing effect, long service life, high working efficiency and low maintenance cost, and is used for preventing blockage, air accumulation and blocking.
The technical scheme adopted for solving the technical problems is as follows:
a large submersible sewage pump comprises a pump body, an impeller nut, a pump seat, a rear pump cover, a sealing cavity, a mechanical seal I and a submersible motor, and is characterized in that the inlet end of the lower end of the pump body is provided with a front pump cover,
The impeller is a half-open double-blade impeller, a hub of the half-open double-blade impeller is in a frustum shape, the outer wall of the hub is in concave arc transition from a small-diameter end to a large-diameter end so as to be beneficial to buffering and guiding the sucked liquid, two cutting movable blades are arranged in a circumferential array at the small-diameter end of the hub, the two cutting movable blades are in a sickle shape, the outer arc ends of the cutting movable blades are cutting edges, the lower ends of the two cutting movable blades are fixedly connected with guide blades, the guide blades are spirally extended and wound on the surface of the hub along the rotating direction of the impeller from the lower end face of the cutting movable blades downwards along the hub, the upper end faces of the guide blades are outwards extended and extended in a horn shape so as to ensure that the impeller flow channel is gradually increased, the particles are prevented from being blocked in the impeller flow channel, the two sides of the end faces of the guide blades are cutting edges,
The center of the front pump cover is provided with a liquid inlet, the periphery of the lower end is uniformly provided with fixing holes, the upper end is provided with an arc convex ring, the arc convex ring extends to the outer end of the arc convex ring in an arc shape from the liquid inlet end to deviate from a horizontal line, the inner circumference of the liquid inlet is provided with two cutting static blades in an array, the cutting static blades are perpendicular to the axis of the liquid inlet, the surface of the arc convex ring is provided with an involute groove, the involute shape of the groove extends in an arc shape from the inner end of the arc convex ring to the outer end along the surface of the arc convex ring,
The front pump cover is abutted against the pump body through the adjusting screw arranged on the circumferential array, so that the gap between the cutting static blade and the cutting dynamic blade of the impeller can be adjusted through the adjusting screw, the front pump cover is fixedly connected with the pump body through the fastening bolt arranged on the circumferential array, the cutting static blade of the front pump cover is abutted against the cutting dynamic blade of the impeller, so that sundries entering the liquid inlet can be sheared, the sundries are prevented from being blocked on the liquid inlet due to overlarge or wound on the impeller due to overlong sundries, the annular convex ring of the front pump cover is matched with the cutting edge face of the guide vane of the impeller to be in abutting sliding connection, so that soft matters or particle sundries which are not sheared and hung on the vane can be sheared or pushed together again through the relative movement of the guide vane and slide into the groove, and then under the rotating action of the impeller, the sundries are extruded into the groove and pumped away along with sewage along the groove, and the water pump shell is prevented from being blocked.
The width of the groove is gradually enlarged from the inner end to the outer end of the upper surface of the annular convex ring of the front pump cover, so that the quick output of sundries is facilitated.
The cutting edge part of the static cutting blade is a saw-tooth-shaped cutting edge, so that the rapid cutting of particles or the tearing of soft substances can be facilitated.
When the mechanical seal one cavity is submerged in water, water enters through the liquid inlet at the lower end of the pump body, gas in the pump body and all gas in the mechanical seal one are discharged through the gas discharge through holes under the action of water pressure, so that the pump cavity and all gas in the mechanical seal one cavity are discharged before starting, the gas accumulation is prevented, the smooth starting of the pump and the effective lubrication of the mechanical seal one are ensured, the mechanical seal one is prevented from being burnt by dry grinding, and the impeller is provided with the liquid return hole, so that the medium in the mechanical seal one cavity forms circular flow, the heat generated by friction of the mechanical seal one can be effectively taken away, the medium pressure in the mechanical seal one cavity can be reduced, the mechanical seal one is protected to the greatest extent, and the service life of the mechanical seal one is prolonged.
The invention discloses a rear mouth ring, which is characterized in that a cleaning groove is arranged on the outer wall of the rear mouth ring and is communicated with a mechanical seal cavity, so that sundries enter the cleaning groove through the clearance rotation of an impeller and a pump body, enter the mechanical seal cavity through the cleaning groove, flow back to a pump body working cavity along a liquid return hole of the impeller, and are pumped out under the centrifugal action of the impeller of the working cavity, so that the impeller is prevented from being blocked, the smooth rotation of the impeller is ensured, and the large rotation torque of the impeller caused by the fact that part of particles are blocked in the clearance between the rear mouth ring and the pump body is avoided, and further the service life of a motor is prevented from being influenced due to the increase of resistance of a submersible motor.
The invention can seal the organic sealing pressing plate on the pump shaft in the sealing cavity, and the organic sealing pressing plate is abutted against the stationary ring of the mechanical seal II, so that the mechanical seal II stationary ring is ejected out by the rising of the pressure in the cavity of the mechanical seal I after the mechanical seal I is damaged.
The invention can also be provided with the oil-water probe in the sealing cavity, when the sealing of the medium end of the mechanical seal II fails, and sewage enters, the oil-water probe is used for uploading the signal to the control system of the pump, and an alarm signal is sent out, so that the maintenance is timely carried out, and the further expansion of the fault is prevented.
According to the invention, the stainless steel sleeve is sleeved on the pump shaft, one end of the stainless steel sleeve is fixedly connected with the shoulder of the pump shaft in a propping way, the other end of the stainless steel sleeve is fixedly connected with the impeller hub in a propping way, and the mechanical seal I is fixed on the stainless steel sleeve, so that the pump shaft is protected by the stainless steel sleeve, and the sealing failure caused by corrosion of a medium on the pump shaft is prevented.
The invention can also be provided with a cylindrical anti-wear sleeve in a way of extending backwards in the axial direction at the front end of the rear pump cover, the side wall of the anti-wear sleeve is provided with an exhaust vent, the outer wall of the front end of the anti-wear sleeve is fixedly connected with the pump body, the inner wall of the anti-wear sleeve is matched with the rear opening ring of the impeller, when the anti-wear sleeve is worn by the rear opening ring of the impeller to enlarge a gap, and a water seal cannot be formed between the impeller rotating at high speed and the rear opening ring to seal a cavity by a water seal, so that when the high-pressure water impacts the mechanical seal to seal the cavity by the mechanical seal, the anti-wear sleeve can be quickly achieved by replacing the rear pump cover and the anti-wear sleeve.
By adopting the structure, the invention has the advantages of novel structure, obvious cutting effect, stable pump operation, good sealing effect, long service life, high working efficiency, low maintenance cost, blockage prevention, air accumulation prevention, blocking prevention and the like.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the front pump cover.
Fig. 3 is a cross-sectional view of B-B in fig. 2.
Fig. 4 is a partial cross-sectional view of E-E of fig. 2.
Fig. 5 is a schematic structural view of the impeller.
Fig. 6 is a rear view of fig. 5.
Fig. 7 is a cross-sectional view of A-A in fig. 5.
Reference numerals: the pump body 1, the impeller 2, the impeller nut 3, the pump seat 4, the rear pump cover 5, the sealing cavity 6, the mechanical seal I7, the submersible motor 8, the cover nut 9, the pump shaft 10, the mechanical seal II 11, the liquid return hole 12, the front pump cover 13, the cutting moving blade 14, the guide vane 15, the arc-shaped convex ring 16, the cutting static blade 17, the groove 18, the adjusting screw 19, the exhaust through hole 20, the rear mouth ring 21, the cleaning groove 22, the machine sealing pressing plate 23, the oil-water probe 24, the stainless steel sleeve 25, the wear-resisting sleeve 26, the exhaust through hole 27 and the fastening bolt 28.
Detailed Description
The invention is described below with reference to the drawings and examples.
As shown in the drawing, the large submersible sewage pump mainly comprises a pump body 1, an impeller 2, an impeller nut 3, a pump seat 4, a rear pump cover 5, a sealing cavity 6, a mechanical seal I7 and a submersible motor 8, wherein an output shaft of the submersible motor 8 is fixedly connected with a pump shaft 10, passes through a mechanical seal II 11 in the sealing cavity 6 and then is in sealing connection with the rear pump cover 5, then passes through a mechanical seal I7 in the mechanical seal I cavity and is fixedly connected with the impeller 2 in a working cavity, the end part of the pump shaft 10 is fixedly connected with a cover nut 9 through the impeller nut 3, the periphery of the rear pump cover 5 is fixedly connected with the cavity of the sealing cavity 6 in a sealing manner, lubricating oil is arranged in the sealing cavity 6, the upper end of the sealing cavity 6 is fixedly connected with the casing of the submersible motor 8, the lower end of the sealing cavity 6 is fixedly connected with the pump body 1 through a bearing, the upper end of a mechanical seal 7in the mechanical seal cavity is in contact seal with a rear pump cover 5, the lower end of the mechanical seal 7 is in contact seal with the end part of a hub of an impeller 2, a rear opening ring is axially arranged at the outer end of the hub of the rear end of the impeller, a rear opening ring 21 of the impeller is in clearance fit with a pump body, a liquid return hole 12 is arranged on the hub of the impeller 2, a mechanical seal 7 is sleeved on a pump shaft 10 in the mechanical seal cavity, the upper end of the mechanical seal 7 is in contact seal with the rear pump cover 5, the lower end of the mechanical seal 7 is in contact seal with the end part of the impeller 2, the front end of the pump body 1 is provided with a water inlet, one side of the pump body is provided with a water outlet, the pump body is fixedly connected with a pump seat, the pump is characterized in that the inlet end of the lower end of the pump body 1 is provided with a front pump cover 13, the impeller 2 is a half-open double-vane impeller, the hub of the half-open double-vane impeller is in a conical table shape, the outer wall of the hub is in a concave arc transition from a small-diameter end to a large-diameter end, in order to be favorable for buffering and guiding the sucked liquid, two cutting movable blades 14 are arranged at the circumference array of the small diameter end of the hub, the two cutting movable blades 14 are sickle-shaped, the outer arc-shaped ends of the cutting movable blades are blades, the lower ends of the two cutting movable blades 14 are fixedly connected with guide blades 15, the guide blades 15 are spirally extended and wound on the surface of the hub along the rotating direction of the impeller by the lower end surfaces of the cutting movable blades downwards along the hub, the upper end surfaces of the guide blades are extended outwards in a horn shape, the impeller runner is gradually increased, particles are prevented from being blocked in the impeller runner, the two sides of the end surfaces of the guide blades are provided with cutting blades,
The center of the front pump cover 13 is provided with a liquid inlet, the periphery of the lower end is uniformly provided with fixing holes, the upper end is provided with an arc-shaped convex ring 16, the arc-shaped convex ring 16 extends to the outer end of the arc-shaped convex ring in an arc shape from the liquid inlet end to the horizontal line, the inner circumference of the liquid inlet is provided with two cutting static blades 17 in an array, the cutting static blades 17 are perpendicular to the axis of the liquid inlet, the surface of the arc-shaped convex ring 16 is provided with an involute groove 18, the involute shape of the groove 18 extends in an arc shape from the inner end of the arc-shaped convex ring to the outer end of the arc-shaped convex ring surface,
The front pump cover 13 is abutted against the pump body 1 through the adjusting screw 19 arranged on the circumferential array, so that the gap between the cutting static blade 17 and the cutting movable blade 14 of the impeller can be adjusted through the adjusting screw 19, the front pump cover 13 is fixedly connected with the pump body 1 through the fastening bolt 28 arranged on the circumferential array, the cutting static blade 17 of the front pump cover 13 is abutted against the cutting movable blade 14 of the impeller, so that sundries entering the liquid inlet can be sheared, the sundries are prevented from being blocked on the liquid inlet due to overlarge sundries, or the sundries are wound on the impeller 2 due to overlong sundries, the annular convex ring 16 of the front pump cover 13 is in matched and abutted sliding connection with the cutting edge surface of the guide vane 15 of the impeller 2, so that soft matters or particle sundries which are not sheared and hung on the vane can be sheared or pushed together again through the relative movement of the guide vane 15 and slide into the groove 18, and then under the rotating action of the impeller 2, the sundries are extruded into the groove 2 and flow into the pump body along with the groove 2, and the sewage is pumped away, so that the water pump cannot be blocked.
The width of the groove 18 is gradually enlarged from the inner end to the outer end of the upper surface of the annular convex ring 16 of the front pump cover 13, so that the quick output of sundries is facilitated.
The cutting edge part of the cutting static blade 17 is a saw-tooth cutting edge, and the saw-tooth ends of the two cutting static blades are oppositely arranged, so that the rapid cutting of particles or the tearing of soft substances can be facilitated.
When the invention is submerged in water, water enters through the liquid inlet at the lower end of the pump body 1, gas in the pump body 1 and all gas in the first mechanical seal 7 are discharged through the gas discharge through holes 20 under the action of water pressure, so that the pump cavity and all gas in the first mechanical seal cavity are discharged before starting, the gas accumulation is prevented, the smooth starting of the pump and the effective lubrication of the first mechanical seal 7 are ensured, the first mechanical seal 7 is prevented from being burnt by dry grinding, and the impeller 2 is provided with the liquid return hole 12, so that the medium in the first mechanical seal cavity forms circular flow, the heat generated by friction can be effectively taken away, the medium pressure in the first mechanical seal cavity can be reduced, the first mechanical seal is protected to the maximum extent, and the service life of the first mechanical seal is prolonged.
The outer wall of the back mouth ring 21 is provided with a cleaning groove 22, the cleaning groove 22 is communicated with a mechanical seal cavity, so that sundries enter the cleaning groove 22 through the clearance rotation between the impeller 2 and the pump body 1, enter the mechanical seal cavity through the cleaning groove 22, flow back to the working cavity of the pump body 1 along the liquid return hole of the impeller 2, are pumped out under the centrifugal action of the impeller 2 of the working cavity, prevent the impeller from being blocked, ensure the smooth rotation of the impeller, and avoid the large rotation torque of the impeller 2 caused by the fact that part of particles are blocked in the clearance between the back mouth ring 21 and the pump body 1, thereby avoiding the influence on the service life of the motor due to the increase of the resistance of the submersible motor.
According to the invention, the organic sealing pressing plate 23 can be sealed on the pump shaft 10 in the sealing cavity 6, and the organic sealing pressing plate 23 is in contact with the static ring of the mechanical seal II 11, so that the mechanical seal II static ring is ejected out by rising the pressure in the cavity of the mechanical seal I after the mechanical seal I7 is damaged.
The invention can also be provided with the oil-water probe 24 in the sealing cavity 6, when the sealing of the medium end of the mechanical seal 7 fails, and sewage enters, the signal is uploaded to the control system of the pump through the oil-water probe 24, and an alarm signal is sent out, so that maintenance is performed in time, and further expansion of faults is prevented.
According to the invention, the stainless steel sleeve 25 can also be sleeved on the pump shaft 10, one end of the stainless steel sleeve 25 is fixedly connected with the shoulder of the pump shaft 10 in a contact manner, the other end of the stainless steel sleeve is fixedly connected with the impeller hub in a contact manner, and the mechanical seal 7 is fixedly arranged on the stainless steel sleeve 25 in a sealing manner, so that the pump shaft is protected through the stainless steel sleeve 25, and the sealing failure caused by corrosion of a medium on the pump shaft is prevented.
The invention can also be provided with a cylindrical anti-abrasion sleeve 26 extending backwards in the axial direction at the front end of the rear pump cover 5, the side wall of the anti-abrasion sleeve 26 is provided with an exhaust port 27, the outer wall of the front end of the anti-abrasion sleeve is fixedly connected with the pump body, and the inner wall of the anti-abrasion sleeve is matched with the rear mouth ring 21 of the impeller 2.
When the invention works, the invention is submerged under water, water enters through the liquid inlet at the lower end of the pump body in the sinking process of the pump body, gas in the working cavity of the pump body is pressed to move upwards into the first cavity of the mechanical seal, and high-pressure gas and all gas in the first cavity of the mechanical seal are discharged through the gas outlet through the side wall of the anti-abrasion sleeve and the gas outlet through the water pressure, so that the pump cavity and all gas in the first cavity of the mechanical seal are discharged before the pump is started, the air accumulation is avoided, the smooth starting of the pump and the effective lubrication of the first cavity of the mechanical seal are ensured, the first mechanical seal is prevented from being burnt out by dry grinding, when the pump body is placed, the submersible motor is started by the control system, the output shaft of the submersible motor drives the impeller on the pump shaft to rotate, and the sludge in the sewage is discharged.
When the particle sundries with the size larger than that of the impeller runner are sucked into the liquid inlet, the sundries entering the liquid inlet are sheared through the relative motion of the cutting static blade in the liquid inlet of the front pump cover and the cutting movable blade of the rotating impeller, so that the sundries are prevented from being excessively large and blocked on the liquid inlet, or long substances or soft substances which are wound on the impeller due to overlong sundries and are not sheared or hung on the blades enter the impeller, as the annular convex ring of the front pump cover is matched with the cutting edge surface of the guide blade of the impeller to be in interference sliding connection, the soft substances or the particle sundries which are not sheared and hung on the blades are sheared or pushed again through the relative motion of the guide blade and the annular convex ring to slide into the grooves on the surface of the arc convex ring, and then under the rotating action of the impeller, the sundries are extruded into the grooves and flow into the pump shell along with sewage, so that the water pump can not be blocked.
When the particle sundries in the sewage pumped by the impeller enter the gap between the impeller and the anti-abrasion sleeve, the impeller rotates at a high speed, so that particles are driven to enter the cleaning groove, then enter the rear opening ring through the cleaning groove, then flow back to the pump body working cavity along the liquid return hole of the impeller, and are pumped out under the centrifugal action of the impeller of the working cavity, so that the impeller is prevented from being blocked, the impeller is ensured to rotate smoothly, the phenomenon that part of particles are blocked in the gap between the rear opening ring and the pump body to cause large impeller rotation torque is avoided, and further the service life of the motor is prevented from being influenced due to the increase of the resistance of the submersible motor.
When the mechanical seal is corroded and damaged, sewage enters the sealing cavity, at the moment, an oil-water probe in the sealing cavity detects the sewage and uploads the information to the control system, and the control system sends out an alarm signal, so that an operator can maintain the sewage in time, and the fault is prevented from being further expanded.
When working for a period of time, the clearance between the cutting movable blade of the impeller and the cutting static blade of the front pump cover is too large, parts do not need to be replaced, the clearance between the cutting movable blade and the cutting static blade can be adjusted by adjusting the adjusting screw, then the fastening bolt on the circumference is locked and fixed again, and the adjustment is very convenient.
By adopting the structure, the invention has the advantages of novel structure, obvious cutting effect, stable pump operation, good sealing effect, long service life, high working efficiency, low maintenance cost, blockage prevention, air accumulation prevention, blocking prevention and the like.
Claims (10)
1. A large submersible sewage pump comprises a pump body, a closed impeller, an impeller nut, a pump seat, a rear pump cover, a sealing cavity, a mechanical seal unit and a submersible motor, and is characterized in that the inlet end of the lower end of the pump body is provided with a front pump cover,
The impeller is a half-open double-blade impeller, a hub of the half-open double-blade impeller is in a frustum shape, the outer wall of the hub is in concave arc transition from a small diameter end to a large diameter end, two cutting movable blades are circumferentially arranged at the small diameter end of the hub in an array manner, the two cutting movable blades are in a sickle shape, the outer arc ends of the cutting movable blades are blades, the lower ends of the two cutting movable blades are fixedly connected with guide blades, the guide blades are spirally extended and wound on the surface of the hub along the rotating direction of the impeller from the lower end face of the cutting movable blades downwards along the hub, the upper end faces of the guide blades are outwards extended and extended in a horn shape, the flow passage of the impeller is gradually increased, the two sides of the end faces of the guide blades are the cutting blades,
The center of the front pump cover is provided with a liquid inlet, the periphery of the lower end is uniformly provided with fixing holes, the upper end is provided with an arc convex ring, the arc convex ring extends to the outer end of the arc convex ring in an arc shape from the liquid inlet end to deviate from a horizontal line, the inner circumference of the liquid inlet is provided with two cutting static blades in an array, the cutting static blades are perpendicular to the axis of the liquid inlet, the surface of the arc convex ring is provided with an involute groove, the involute shape of the groove extends in an arc shape from the inner end of the arc convex ring to the outer end along the surface of the arc convex ring,
The front pump cover is fixedly connected with the pump body through fastening bolts arranged in a circumferential array, the cutting static blade of the front pump cover is abutted against the cutting dynamic blade of the impeller, and the annular convex ring of the front pump cover is matched with the cutting edge face of the guide vane of the impeller to be abutted against and in sliding connection.
2. A large scale submersible sewage pump as claimed in claim 1 wherein the width of the channel gradually increases from the inner end to the outer end of the upper surface of the annular collar of the front pump cover.
3. A large scale submersible sewage pump according to claim 1 or 2, wherein the blade portion of the cutting stationary blade is a serrated blade.
4. A large scale submersible sewage pump according to claim 1 wherein the pump body side wall of the mechanical seal cavity is provided with vent holes.
5. A large scale submersible sewage pump according to claim 1 wherein the rear collar outer wall of the impeller is provided with a cleaning groove which communicates with a mechanically sealed cavity.
6. The large submersible sewage pump of claim 1, wherein the pump shaft in the sealing cavity is provided with an organic sealing pressing plate in a sealing manner, and the organic sealing pressing plate is abutted against a stationary ring of the mechanical seal II.
7. The large submersible sewage pump of claim 1, wherein the sealed cavity is provided with an oil-water probe.
8. The large submersible sewage pump of claim 6, wherein the pump shaft is sleeved with a stainless steel sleeve, one end of the stainless steel sleeve is fixedly connected with a shoulder of the pump shaft in a contact manner, the other end of the stainless steel sleeve is fixedly connected with the impeller hub in a contact manner, and the mechanical seal is fixedly arranged on the stainless steel sleeve.
9. The large submersible sewage pump according to claim 1, wherein the front end of the rear pump cover is provided with a cylindrical anti-wear sleeve in a rearward extending manner, the side wall of the anti-wear sleeve is provided with an exhaust port, the outer wall of the front end of the anti-wear sleeve is fixedly connected with the pump body, and the inner wall of the anti-wear sleeve is matched with the rear port ring of the impeller.
10. The large submersible sewage pump of claim 1 wherein said front pump cover is in contact with the pump body via a circumferential array of set screws.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911094349.5A CN110836188B (en) | 2019-11-11 | 2019-11-11 | Large submersible sewage pump |
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| CN201911094349.5A CN110836188B (en) | 2019-11-11 | 2019-11-11 | Large submersible sewage pump |
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| CN110836188B true CN110836188B (en) | 2024-09-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3988794B1 (en) | 2020-10-26 | 2024-07-31 | Xylem Europe GmbH | Impeller seat with a guide pin for a pump |
| EP3988795B1 (en) * | 2020-10-26 | 2024-07-31 | Xylem Europe GmbH | Impeller seat with a guide pin and a feeding groove for a pump |
| EP3988793B1 (en) * | 2020-10-26 | 2024-08-07 | Xylem Europe GmbH | Pump comprising an impeller seat with a guide pin |
| CN114087234A (en) * | 2021-12-07 | 2022-02-25 | 杭州富宇泽环保科技有限公司 | Anti-blocking water pump and using method thereof |
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| CN211202311U (en) * | 2019-11-11 | 2020-08-07 | 山东双轮股份有限公司 | Large submersible sewage pump |
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| CN201696308U (en) * | 2010-06-17 | 2011-01-05 | 上海汇业机械科技有限公司 | Diving sewage pump with cutting tools |
| EP3027909B1 (en) * | 2013-08-01 | 2018-09-19 | Bjm Pumps Llc | Shred and shear pump |
| CN104791284A (en) * | 2014-01-20 | 2015-07-22 | 江苏大学 | Cutting anti-blocking device for enclosed impeller ring of sewage pump |
| CN104100534B (en) * | 2014-07-07 | 2016-04-20 | 南京中德环保设备制造有限公司 | A kind of diving cutting dredge pump possessing high-efficiency hydraulic characteristic |
| KR101497052B1 (en) * | 2014-07-18 | 2015-02-27 | 김상국 | Apparatus for Cutting of Trash for Submersible Pump |
| CN208778266U (en) * | 2018-09-26 | 2019-04-23 | 江苏源泉泵业股份有限公司 | A kind of anti-stifled grinder-mixer of small-power low discharge high-lift diving dredge pump |
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| CN211202311U (en) * | 2019-11-11 | 2020-08-07 | 山东双轮股份有限公司 | Large submersible sewage pump |
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