CN109372758B

CN109372758B - Vertical submerged long shaft pump

Info

Publication number: CN109372758B
Application number: CN201811408794.XA
Authority: CN
Inventors: 王泽兵; 江劲松; 王靖; 徐彦鹏; 唐建迎; 蒋世宏; 魏家楷; 罗先荣
Original assignee: Guangzhou Xinheng Pump Manufacturing Co ltd
Current assignee: Guangzhou Xinheng Pump Manufacturing Co ltd
Priority date: 2018-11-23
Filing date: 2018-11-23
Publication date: 2023-08-15
Anticipated expiration: 2038-11-23
Also published as: CN109372758A

Abstract

The invention relates to the technical field of pumps, in particular to a vertical submerged long-shaft pump, which is provided with a starting lubrication system, wherein lubricating liquid can be introduced into the inner side of a sliding bearing for lubrication before the long-shaft pump is started; the lubricating cooling and heat-preserving system is provided with the regulating valve, and the heat-radiating effect of the sliding bearing is improved or reduced by regulating the flow of the lubricating liquid; the flushing system is stopped and started, flushing fluid is introduced into the flushing cavity after stopping or before starting, and the flushing cavity is flushed, so that abrasion caused by particle impurities existing between the guide vane and the pump shaft is prevented; and the residual axial force balancing system realizes the balance of residual axial force through a balancing chamber formed between the thrust disc and the sliding bearing, improves the safe reliability of the operation of the long-shaft pump, and prolongs the service life of the pump.

Description

Vertical submerged long shaft pump

Technical Field

The invention relates to the technical field of pump bodies, in particular to a vertical submerged long-axis pump.

Background

In the existing vertical guide vane type submerged long shaft pump at present, there are two large types: one is a guide bearing structure type, and the other is a rolling bearing structure type. The guide bearing structure type is divided into two structures, namely the weight of the whole rotor part and the residual axial force of the water pump are borne by the motor and the thrust bearing arranged on the pump support; the rolling bearing structure type is divided into a common shaft seal structure and a combined automatic liquid draining structure.

The existing vertical submerged long-axis pump has the following problems:

firstly, a shutdown flushing system is not arranged, impurities such as sediment are easy to deposit at a sliding bearing in a guide vane after a water pump is shut down, and the sliding bearing and a pump shaft are easy to wear when the water pump is started for the second time;

secondly, a residual axial force balance system is not arranged, and as the pressure difference between the water inlet end and the water outlet end of the impeller assembly and the pressure of the water inlet end is larger than that of the water outlet end when the water pump is in operation, the axial force born by the pump shaft is larger, and further, the residual axial force generated by the operation of the water pump can increase the damage progress of the motor or a thrust bearing arranged on the pump support;

thirdly, the submerged long shaft pump is not provided with a starting lubrication system, and when the water pump is started, a certain time is needed for pumping the medium to flow to the outlet of the pump support, so that the dry friction problem occurs on the sliding bearing at the upper end of the water pump.

Disclosure of Invention

The invention aims to provide a vertical submerged long-axis pump which can effectively reduce pump shaft abrasion, prolong service life and improve use stability and safety.

In order to achieve the above purpose, the invention provides a vertical submerged long shaft pump, which comprises a control unit, a connecting pipe, a pump shaft, an impeller assembly, a protection pipe, a first bearing assembly, a shaft seal assembly and a fixing nut, wherein the impeller assembly, the protection pipe, the shaft seal assembly and the fixing nut are arranged on the pump shaft;

the impeller assembly comprises an impeller and a guide vane, the pump shaft is sleeved with a second sliding bearing and a second sleeve, the second sliding bearing is sleeved and fixed on the inner side of the guide vane, the second sleeve is sleeved on the inner side of the second sliding bearing and is connected with the pump shaft in a key manner, a flushing cavity is formed among the guide vane, the second sliding bearing and the second sleeve, the guide vane is provided with a flushing hole, and the flushing hole is communicated with the flushing cavity to form a flushing channel;

the liquid inlet and outlet pipe, the lubrication cavity, the balance chamber and the flushing channel are communicated to form a lubrication channel;

the shaft seal assembly is connected with a liquid inlet and outlet pipe, a first electromagnetic valve is arranged on the liquid inlet and outlet pipe, and the first electromagnetic valve is electrically connected with the control unit.

Optionally, the pump cavity is provided with a pressure detector, and the pressure detector is electrically connected with the control unit.

Optionally, the pump shaft includes first coupling shaft, second coupling shaft and shaft coupling subassembly, the shaft coupling subassembly includes first shaft coupling, elastomeric block and second coupling, first shaft coupling is installed in first coupling shaft, the second coupling shaft is installed in the second coupling shaft, the elastomeric block is connected with first coupling shaft and second coupling shaft respectively, have first clearance between first shaft coupling and the second coupling.

Optionally, the pump shaft sleeve is provided with a first throttling sleeve, and the first throttling sleeve is arranged between the lubrication cavity and the flushing cavity.

Optionally, the pump further comprises a water outlet bell mouth, the water outlet bell mouth is fixedly connected with the connecting pipe and the impeller assembly respectively, the pump shaft sleeve is provided with a second throttling sleeve, a second shaft seal is arranged between the water outlet bell mouth and the second throttling sleeve, the pump shaft is provided with a second shaft seal gland and a second shaft seal, the water outlet bell mouth is provided with a lubricating liquid hole, a shaft seal chamber and an orifice, the second shaft seal gland is provided with a liquid outlet hole, the lubricating liquid hole is communicated with the pump cavity through the liquid outlet hole, the lubricating liquid hole is connected with a liquid inlet pipe, a regulating valve is arranged on the liquid inlet pipe, the liquid inlet pipe is provided with a temperature detection probe and a first pressure detection probe, and the regulating valve, the temperature detection probe and the first pressure detection probe are all electrically connected with the control unit.

Optionally, the flushing hole is connected with the flushing pipe, the flushing pipe is provided with second solenoid valve, second pressure detection probe and third solenoid valve, second pressure detection probe and third solenoid valve all are connected with the control unit electricity.

Optionally, the thrust disc is provided with an upper friction surface, a lower friction surface and a side friction surface, the first sliding bearing is provided with a radial lubrication groove and an axial lubrication groove, and the balance chamber is formed by combining the lower friction surface with the radial lubrication groove and the side friction surface with the axial lubrication groove.

Optionally, the first bearing seat is provided with a liquid collecting chamber for collecting liquid leaked from the shaft seal assembly, and the liquid collecting chamber is connected with a liquid drain pipe.

Optionally, the shaft seal assembly includes shaft seal seat, first shaft seal and first shaft seal gland, shaft seal seat and first bearing frame fixed connection, the pump shaft cover is equipped with first axle sleeve, first shaft seal cover is located the first axle sleeve outside, first shaft seal gland is installed in the shaft seal seat and is used for fixed first shaft seal, first shaft sleeve butt is in thrust plate one end, fixation nut threaded connection is used for fixed first shaft sleeve and thrust plate in the pump shaft, the shaft seal seat is installed the thrust ring through the screw, can form the second clearance between the friction surface on thrust ring and the thrust plate

Optionally, a thrust disc is arranged between the guide vane and the impeller, the thrust disc is sleeved on the pump shaft, a third gap is formed between the thrust disc and the second sliding bearing, and a fourth gap is formed between the impeller and the guide vane.

The embodiment of the invention has the following technical effects:

firstly, before the long shaft pump is started, lubricating liquid can be introduced into the lubricating cavity through the liquid inlet and outlet pipe to lubricate the sliding bearing, so that the phenomenon of dry friction between the sliding bearing and the pump shaft after the long shaft pump is started is prevented, and the service life of the pump shaft is effectively prolonged;

secondly, when the long-shaft pump operates, when residual axial force is generated, the residual axial force is balanced through the balance chambers formed on the two sides of the thrust disc, a thrust bearing and a lubricating structure are not required to be additionally arranged for lubrication, and the balance of the residual axial force is realized while the sliding bearing is lubricated;

thirdly, a flushing cavity is formed among the guide vane, the second sliding bearing and the second sleeve, the guide vane is provided with a flushing hole, the flushing hole is communicated with the flushing cavity to form a flushing channel, and before or after the long-shaft pump is started, the flushing hole is connected with flushing equipment to flush a gap between the guide vane and the pump shaft, so that particle impurities in pumped liquid are prevented from remaining between the guide vane and the pump shaft, abrasion of the pump shaft or the guide vane caused by the next starting is avoided, and the service lives of the guide vane and the pump shaft are prolonged;

drawings

Fig. 1 is a schematic structural view of the first embodiment.

Fig. 2 is a schematic diagram of the upper structure of the first embodiment.

Fig. 3 is a schematic diagram of a middle section structure of the first embodiment.

Fig. 4 is a schematic view of the lower section structure of the first embodiment.

Fig. 5 is an enlarged schematic view of f in fig. 1.

Fig. 6 is an enlarged schematic view of a in fig. 2.

Fig. 7 is an enlarged schematic view of e in fig. 6.

Fig. 8 is an enlarged schematic view of b in fig. 4.

Fig. 9 is an enlarged schematic view of c in fig. 4.

Fig. 10 is a schematic view of a first sliding bearing of the first embodiment.

Fig. 11 is a schematic view of a thrust disc of the first embodiment.

Fig. 12 is a schematic view of a thrust plate according to the first embodiment.

Fig. 13 is a schematic structural view of the second embodiment.

Fig. 14 is an enlarged schematic view of d in fig. 13.

Fig. 15 is a schematic view of a water outlet bell mouth of the second embodiment.

Fig. 16 is a schematic view of a second sealing gland of the second embodiment.

Reference numerals illustrate:

in fig. 1: 1. an upper section; 2. a middle section; 3. a lower section; 100. a lubrication chamber; 200. a pump chamber; A. a first gap;

in fig. 2: 4. a pump support; 5. a connecting pipe; 6. a protective tube; 7. a second bearing seat; 8. a third sliding bearing; 9. a first coupling; 10. a liquid discharge pipe; 11. a third sleeve; 12. a pump shaft; 13. a pressure detector; 14. a first bearing seat; 15. a first sliding bearing; 16. a thrust collar; 17. a shaft seal seat; 18. a first shaft seal gland; 19. a fixing nut; 20. a water pump coupling; 21. a first shaft seal; 22. a motor bracket; 23. a liquid inlet and outlet pipe; 24. a first electromagnetic valve; 25. a first sleeve; 26. a thrust plate;

in fig. 3: 5. a connecting pipe; 6. a protective tube; 7. a second bearing seat; 8. a third sliding bearing; 9. a first coupling; 11. a third sleeve; 12. a pump shaft; 14. a first bearing seat; 15. a first sliding bearing; 26. a thrust plate; 27. a backstop pad; 28. a round nut; 29. a second coupling; 30. an elastic block;

in fig. 4: 5. a connecting pipe; 6. a protective tube; 12. a pump shaft; 14. a first bearing seat; 26. a thrust plate; 27. a backstop pad; 28. a round nut; 29. a second coupling; 30. an elastic block; 31. flushing the hole; 32. a plug; 33. a first sleeve; 34. a second sleeve; 35. a second sliding bearing; 36. a thrust plate; 37. an impeller; 38. a water inlet bell mouth; 39. a filter screen; 40. an impeller nut; 41. a guide vane; 42. a water outlet bell mouth; 43. a flushing chamber;

in fig. 5: 9. a first coupling; 29. a second coupling; 30. an elastic block; A. a first gap;

in fig. 6: 12. pump shaft, 14, first bearing seat; 15. a first sliding bearing; 16. a thrust collar; 17. a shaft seal seat; 21. a first shaft seal; 25. a first sleeve; 26. a thrust plate; 44. an O-ring; 45. a liquid collection cavity; 46. a liquid collection chamber;

in fig. 7: 15. a first sliding bearing; 16. a thrust collar; 26. a thrust plate; 47. a balancing chamber; 52. balance ring groove; B. and a second gap.

In fig. 8: 12. a pump shaft; 14. a first bearing seat; 15. a first sliding bearing, 26, a thrust disc, 27 and a backstop pad; 28. round nuts, 44 and O-shaped rings; 47. a balancing chamber;

in fig. 9: 12. a pump shaft; 34. a second sleeve; 35. a second sliding bearing; 36. a thrust plate; 43. a flushing chamber; 44. an O-ring; C. a third gap; D. a fourth gap;

in fig. 10: 48. Radial lubrication grooves; 49. an axial lubrication groove;

in fig. 11: 50. an upper friction surface; 51. a lower friction surface; 52. balance ring groove; 53. a side friction surface; 261. a tray portion, 262, seat portion;

in fig. 12: 36. a thrust plate; 54. a radial flushing groove;

in fig. 13: 23. a liquid inlet and outlet pipe; 24. a first electromagnetic valve; 55. a liquid inlet pipe; 56. a regulating valve; 57. A temperature detection probe; 58. a first pressure detection probe; 59. A second pressure detection probe; 60. a second electromagnetic valve; 61. a third electromagnetic valve; 62. a flushing pipe; 42. a water outlet bell mouth; 64. a second sealing gland; 65. second sealing; 66. a second throttling sleeve;

in fig. 14: 12. a pump shaft; 44. an O-ring; 64. a second sealing gland; 65. second sealing; 66. a second throttling sleeve;

in fig. 15: 67. a lubrication fluid hole; 68. a shaft seal chamber; 69. an orifice;

in fig. 16: 64. a second sealing gland; 70. and a liquid outlet hole.

Detailed Description

The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.

Example 1:

referring to fig. 1-12, the present embodiment provides a vertical submerged long shaft pump, which comprises a control unit, a connecting pipe 5, a pump shaft 12, and an impeller assembly, a protection pipe 6, a first bearing assembly, a shaft seal assembly and a fixing nut 19 which are mounted on the pump shaft 12, wherein a lubrication chamber 100 is formed between the protection pipe 6 and the shaft seal assembly and the pump shaft 12, a first end of the connecting pipe 5 is connected with the impeller assembly, a second end of the connecting pipe 5 is connected with the first bearing assembly, a pump chamber 200 is formed between the connecting pipe 5 and the protection pipe 6, the first bearing assembly comprises a first bearing seat 14, a first sliding bearing 15 and a thrust disc 26, the first sliding bearing 15 and the first bearing seat 14 are sequentially sleeved on the pump shaft 12 along the radial direction of the pump shaft 12, the first sliding bearing 15 is mounted and fixed on the first bearing seat 14, a balance chamber 47 is formed between the thrust disc 26 and the first sliding bearing 15, and the fixing nut 19 is in threaded connection with the pump shaft 12 for fixing the thrust disc 26;

when the operation condition of the long-shaft pump changes (i.e. the operation pressure fluctuates and the pressure-holding operation occurs) or the axial force of the pump cannot be balanced completely, the residual axial force of the long-shaft pump is balanced through the balancing chamber 47, namely when pumped liquid passes through the balancing chamber 47, the liquid pushes the thrust disc 26 and the first sliding bearing 15 to generate relative motion, so that the liquid forms an annular sealing water ring in the balancing chamber 47, the dynamic sealing effect is achieved, the pressure of the liquid is reduced, the pressure of the end, close to the first sliding bearing 15, of the thrust disc 26 is greater than the pressure of the end, far from the first sliding bearing 15, of the long-shaft pump, the residual axial force of the pump shaft 12 is balanced, the stability of the operation of the pump shaft 12 is improved, and the service life of the long-shaft pump is prolonged.

Referring to fig. 4 and 9, the impeller assembly comprises an impeller 37 and a guide vane 41, the pump shaft 12 is sleeved with a second sliding bearing 35 and a second sleeve 34, the second sliding bearing 35 is sleeved and fixed on the inner side of the guide vane 41, the second sleeve 34 is sleeved on the inner side of the second sliding bearing 35 and is connected with the pump shaft 12 in a key way, a flushing cavity 43 is formed among the guide vane 41, the second sliding bearing 35 and the second sleeve 34, the guide vane 41 is provided with a flushing hole 31, the flushing hole 31 and the flushing cavity 43 are communicated to form a flushing channel, and the pump shaft 12 is provided with an impeller nut 40 for fixing the impeller assembly;

the washing hole 31 is externally connected with washing equipment to wash, washing liquid flows into the washing cavity 43 through the washing hole 31 to wash the second sliding bearing 35, and sediment and impurities accumulated on the second sliding bearing 35 are removed;

referring to fig. 1 and 6, the shaft seal assembly is connected with a liquid inlet and outlet pipe 23, the liquid inlet and outlet pipe 23 is provided with a first electromagnetic valve 24, and the first electromagnetic valve 24 is electrically connected with the control unit;

the liquid inlet and outlet pipe 23, the lubrication chamber 100, the balance chamber 47, and the flushing passage communicate to form a lubrication passage.

The pump chamber 200 is provided with a pressure detector 13, the pressure detector 13 being electrically connected to the control unit.

Further, referring to fig. 1 to 4 and fig. 5, the long shaft pump of the present embodiment includes an upper section 1, a middle section 2, and a lower section 3, where the pump shaft 12 includes a first coupling shaft, a second coupling shaft, and a coupling assembly, the coupling assembly includes a first coupling 9, an elastic block 30, and a second coupling 29, the first coupling 9 is mounted on the first coupling shaft, the second coupling shaft is mounted on the second coupling shaft, the elastic block 30 is connected with the first coupling shaft and the second coupling shaft, a first gap a is matched between the first coupling 9 and the second coupling 29, so that a space between the first coupling 9 and the second coupling 29 with axial movement can be buffered by an elastic block 30, the present embodiment has three coupling shafts, all connected by the coupling assembly, the coupling assembly is locked and fixed by a round nut 28 and a stop washer 27, where a person skilled in the art can set the number of coupling shafts according to actual use conditions, the coupling shafts adopt a segment type flexible coupling, the sliding bearing does not bear the whole rotor weight of the pump, the problem of the pump that the long length under liquid causes is long, the pump has a running difficulty and the problem of running, the pump is greatly improved, the running safety and the pump is guaranteed, and the running safety is improved; in addition, the three connecting shafts of the embodiment are connected through the first coupling 9, the elastic block 30 and the second coupling 29, and residual axial force generated by the pump shaft 12 during working is balanced through elastic buffering and reaction force of the elastic block 30, so that the capability of balancing the residual axial force of the long-shaft pump is further improved, and the service life and the working stability of the long-shaft pump are improved.

Referring to fig. 6, the pump shaft 12 is sleeved with the first throttling sleeve 33, and the first throttling sleeve 33 is arranged between the lubrication cavity 100 and the flushing cavity 43, so that the lubrication fluid passing through the lubrication cavity 100 and the flushing cavity 43 is fully contacted with the sliding bearing for lubrication, and the lubrication effect is improved.

Referring to fig. 11, the thrust disc 26 of the present embodiment includes a disc portion 261 and a seat portion 262, the outer diameter of the disc portion 261 is larger than the outer diameter of the seat portion 262, a balancing ring groove 52 is formed at the joint of the disc portion 261 and the seat portion 262, during the process of the liquid passing through the balancing chamber 47, the force of the liquid acting on the balancing ring groove 52 promotes the thrust disc to move away from the first sliding bearing 15 in the axial direction of the pump shaft 12, thereby further improving the capability of balancing the residual axial force, the cross section of the balancing ring groove 52 is a semi-arc groove, so that the stress concentration at the joint of the disc portion 261 and the seat portion 262 is reduced when the thrust disc 26 bears the axial pressure, and the local stress limit of the joint of the disc portion 261 and the seat portion 262 is improved.

The thrust disc 26 is provided with an upper friction surface 50, a lower friction surface 51 and a side friction surface 53, so that the friction force between the liquid flowing through the thrust disc 26 and the thrust disc 26 is increased, and the resultant force direction of the generated friction force is the direction away from the first sliding bearing 15 in the axial direction, so that the residual axial force balancing capability of the embodiment is further improved; the lower friction surface 51 is connected with the side friction surface 53 through the balance ring groove 52, the first sliding bearing 15 is provided with a radial lubrication groove 48 and an axial lubrication groove 49, a balance chamber 47 is formed by combining the lower friction surface 51 with the radial lubrication groove 48 and between the side friction surface 53 and the axial lubrication groove 49, the radial lubrication groove 48 is of a streamline structure rotating clockwise or anticlockwise, the radial lubrication groove 48 and the axial lubrication groove 49 are communicated and smoothly transited, so that liquid is fully contacted with the radial lubrication groove 48 and the axial lubrication groove 49 in the flowing process, and the sealing effect of the balance chamber 47 formed by combining the lower friction surface 51 with the radial lubrication groove 48 and between the side friction surface 53 and the axial lubrication groove 49 is improved.

The first sliding bearing 15 is made of high polymer composite material, a screw hole is arranged on the first sliding bearing 15, the screw hole is arranged in the radial lubrication groove 48, the thrust disc 26 is made of metal material, and the upper friction surface 50, the lower friction surface 51 and the side friction surface 53 are made of sprayed alloy material.

Referring to fig. 6, in this embodiment, the first bearing seat 14 near the liquid collecting cavity 45 is provided with a liquid collecting chamber 46 for collecting the liquid leaked from the axle seal assembly, the liquid collecting chamber 46 is connected with the liquid discharging pipe 10, and the medium collected by the liquid collecting chamber 46 flows back into a pool or a volume tank installed by the long-axis pump after passing through the liquid discharging pipe 10, so that the resource is recovered and saved.

Referring to fig. 1 and 7, specifically, the shaft seal assembly includes a shaft seal seat 17, a first shaft seal 21 and a first shaft seal gland 18, the shaft seal seat 17 is fixedly connected with the first bearing seat 14, an O-ring 44 is disposed between the shaft seal seat 17 and the first bearing seat 14, the pump shaft 12 is sleeved with a first shaft sleeve 25, the first shaft seal is sleeved outside the first shaft sleeve 25, the first shaft seal gland 18 is installed on the shaft seal seat 17 and is used for fixing the first shaft seal 21, the first shaft sleeve 25 is abutted to one end of the thrust disc 26, a fixing nut 19 is in threaded connection with the pump shaft 12 and is used for fixing the first shaft sleeve 25 and the thrust disc 26, an O-ring 44 is disposed between the fixing nut 19 and the first shaft sleeve 25, a thrust ring 16 is installed on the shaft seal seat 17 through a screw, a second gap B can be formed between the thrust ring 16 and a friction surface 50 on the thrust disc 26, a space for buffering and axial movement is formed between the thrust disc 16 and the thrust disc 26, a liquid collecting cavity 45 is formed between the thrust ring 16, the thrust ring 17, the first shaft seal gland 21 and the first shaft sleeve 25, the liquid collecting cavity 45 is formed between the first shaft seal seat 17, the first shaft seal 25, the liquid collecting cavity 45, a balancing cavity 47, a screw hole 100 is formed between the liquid collecting cavity and the liquid collecting cavity 45, a radial channel 45 is formed between the liquid collecting cavity 45 and a radial channel 48, and a radial channel 48 is formed between the liquid collecting cavity 45 and a radial channel 48, and a radial channel is formed between the liquid collecting cavity 45, and a radial cavity 45, and a lubricant cavity is connected between the liquid collecting cavity 45, and a radial cavity, and a channel, and a lubricant cavity, and a liquid cavity.

Referring to fig. 3, the present embodiment further includes a second bearing assembly, where the second bearing assembly includes a second bearing seat 7, a third sliding bearing 8, and a third shaft sleeve 11, the third shaft sleeve 11 is sleeved on the pump shaft 12, and the third sliding bearing 8 is installed on the second bearing seat 7 and sleeved on the outer side of the third shaft sleeve 11, so as to further improve stability of the pump shaft 12 in the running process.

Referring to fig. 4 and 9, a thrust disc 36 is disposed between the vane 41 and the impeller 37, the thrust disc 36 is sleeved on the pump shaft 12, and a fourth gap D is provided between the impeller 37 and the vane 41, so that when the long shaft pump works, the impeller 37 and the vane 41 have a buffer space to prevent top dead, a third gap C is formed between the thrust disc 36 and the second sliding bearing 35, a buffer and axial movement space is provided between the thrust disc 36 and the second sliding bearing 35 to prevent top dead, the thrust disc 36 is provided with a radial flushing groove 54 communicated with the flushing cavity 43, when the flushing liquid flows into the flushing hole 31, the flushing liquid flows through the flushing cavity 43 to flush the radial flushing groove 54, and when no flushing is needed, the flushing hole 31 is provided with a plug 32.

When the long-axis pump is started, the long-axis pump pumps the medium from bottom to top to generate a lift, when the pressure detector 13 detects that the pressure of the pump cavity 200 reaches the preset pressure, the control unit sends out the command, the first electromagnetic valve 24 is closed, the external bearing lubricating liquid stops flowing, the long-axis pump enters normal operation, long-axis pumping medium flows out of the liquid collecting chamber 46 from bottom to top through the second sliding bearing 35, the lubricating cavity 100 and the like after flowing into the liquid collecting chamber 45 from bottom to top through the shaft seal assembly, the medium collected by the liquid collecting chamber 46 flows back into a pool or a volume tank arranged on the long-axis pump through the liquid discharging pipe 10, and when the long-axis pump is started up for the next time, the long-axis pump is restarted to ensure that the sliding bearing of the long-axis pump cannot generate dry friction phenomenon; when the operating conditions of the long-shaft pump change (i.e., the operating pressure fluctuates and other pressure operation occurs) or the axial force of the pump is not completely balanced, the residual axial force of the long-shaft pump is balanced through the balancing chamber 47, i.e., the thrust disc 26 acts to balance the residual axial force.

Referring to fig. 4, the pump further comprises a water inlet bell mouth 38, wherein the water inlet bell mouth 38 is matched and installed on the guide vane 41 and matched with the impeller 37 to form a gap, the water inlet bell mouth 38 is provided with a filter screen 39, and larger particles in liquid entering the long-axis pump are filtered, so that the pump body is prevented from being damaged.

Referring to fig. 2, the pump support 4 is further included, the drain pipe 10 is installed on the pump support 4, and the motor support 22 is installed on the pump support 4, wherein the pump shaft 12 is installed with a pump coupling 20 at one end for connecting with a motor.

Example 2:

referring to fig. 13 to fig. 16, the difference between the present embodiment and embodiment 1 is that the present embodiment further includes a water outlet bell 42, the water outlet bell 42 is fixedly connected with the coupling pipe 5 and the impeller assembly respectively, the pump shaft 12 is sleeved with a second throttling sleeve 66, a second shaft seal 65 is disposed between the water outlet bell 42 and the second throttling sleeve 66, the pump shaft 12 is installed with a second shaft seal cover 64 and is matched with the second shaft seal 65, the water outlet bell 42 is provided with a lubrication liquid hole 67, a shaft seal chamber 68 and an orifice 69, the second shaft seal cover 64 is provided with a liquid outlet hole 70, the lubrication liquid hole 67 is communicated with the pump cavity 200 through the liquid outlet hole 70, the lubrication liquid hole 67 is connected with a liquid inlet pipe 55, a regulating valve 56 is disposed on the liquid inlet pipe 55, the liquid inlet and outlet pipe 23 is provided with a temperature detecting probe 57 and a first pressure detecting probe 58, the regulating valve 56, the temperature detecting probe 57 and the first pressure detecting probe 58 are all electrically connected with the control unit, and the pump shaft in the present embodiment is sleeved with the second shaft seal 65, so that impurities contained in the pumped medium are prevented from generating lift force along with high-speed rotation of the shaft to easily enter the guide bearing, and serious wear of the guide bearing and the pump shaft 12; in addition, the second shaft seal 65 prevents the lubrication chamber from communicating with the pump chamber, so that when the head of the pump is high, the pressure required for cooling the long shaft pump is also high (the pressure for cooling is larger than the head of the pump), and at this time, the axial force of the long shaft pump is increased, and the pressure of the pump chamber of the impeller assembly is reduced, so that the pressure required for cooling the long shaft pump is reduced, and the damage degree of the thrust bearing or the motor is reduced.

Further, the flushing hole 31 is connected with a flushing pipe 62, the flushing pipe 62 is provided with a second solenoid valve 60, a third solenoid valve 61 and a second pressure detection probe 59, and the second solenoid valve 60, the third solenoid valve 61 and the second pressure detection probe 59 are all electrically connected with the control unit.

When the long shaft pump starts to start, the control unit sends out an instruction, the second electromagnetic valve 60 is opened, external flushing liquid flows into the flushing cavity 43 through the flushing pipe 62 and the flushing hole 31 to flush the second sliding bearing 35, and sediment or impurities deposited on the second sliding bearing 35 are removed; when the flushing time reaches the preset time of the control unit, the control unit sends out an instruction, the second electromagnetic valve 60 is closed, the regulating valve 56 is opened, the first electromagnetic valve 24 is opened, the external bearing lubricating liquid flows into the lubricating liquid hole 67, the liquid outlet hole 70, the lubricating cavity 100, the first sliding bearing 15 and the liquid collecting cavity 45 through the liquid inlet and outlet pipe 23 through the liquid inlet pipe 55, when the first pressure detecting probe 58 detects that the pressure reaches the preset value, the control unit sends out an instruction, the long-axis pump is started, the control unit sends out an instruction, the regulating valve 56 reduces the flow to save the lubricating liquid resource, the long-axis pump enters into normal operation, after the long-axis pump is stopped normally, the shell of the starting process is repeated when the long-axis pump is started next time, so that the sliding bearing of the long-axis pump is ensured not to generate dry friction phenomenon;

the second shaft seal 65 and the second throttling sleeve 66 are arranged on the long shaft pump, so that bearing lubricating liquid of the long shaft pump is prevented from being mixed with pumping medium, the long shaft pump operates, when the temperature detection probe 57 detects a high temperature or a low temperature preset value, the control unit gives out an instruction, the regulating valve 56 is opened gradually to increase the flow rate of the bearing lubricating liquid so as to reduce or increase the temperature of the sliding bearing, the pump shaft 12 and the like, when the temperature detection probe 57 detects an allowable operating temperature value, the regulating valve 56 is opened to ensure the normal operation of the long shaft pump, and when the temperature detection probe 57 detects a shutdown value for setting the high temperature or the low temperature, the control unit gives out an instruction, and the long shaft pump stops operating; the long shaft pump can be used in high-temperature or low-temperature environments when the long shaft pump pumps high-temperature or low-temperature media.

When the operation condition of the long-axis pump changes or the axial force of the pump shaft 12 cannot be completely balanced, the control unit sends out an instruction when the second pressure detection probe 59 detects the highest set pressure value, the second electromagnetic valve 60 is opened, the residual axial force generated by the long-axis pump is decompressed after passing through the flushing cavity 43, the flushing hole 31 and the flushing pipe 62, the balance of the residual axial force is carried out, and when the second pressure detection probe 59 detects the lowest set pressure value, the second electromagnetic valve 60 is closed, and the long-axis pump operates normally;

after the long shaft pump is normally stopped, the control unit sends out an instruction, the third electromagnetic valve 61 is opened, external flushing liquid flows into the flushing cavity 43 through the flushing pipe 62 to flush the second sliding bearing 35, and sediment and impurities accumulated on the second sliding bearing 35 are removed; when the flushing time reaches the time value set by the control unit, the control unit gives an instruction, the third electromagnetic valve 61 is closed, and the normal shutdown process of the long-axis pump is completed.

In conclusion, the invention can pump clean normal temperature medium containing proper particles, and can pump high temperature medium and low temperature medium; before the long-shaft pump is started, lubricating liquid can be introduced into the lubricating cavity 100 through the liquid inlet and outlet pipe 23 to lubricate the sliding bearing, so that the phenomenon of dry friction between the sliding bearing and the pump shaft 12 after the long-shaft pump is started is prevented, the service life of the pump shaft 12 is effectively prolonged, when the long-shaft pump is operated, residual axial force is balanced through the balance chambers 47 formed on two sides of the thrust disc 26 when the residual axial force is generated, the sliding bearing is lubricated without additionally arranging a thrust bearing and a lubricating structure, and the balance of the residual axial force is realized while the sliding bearing is lubricated; meanwhile, in the lubricating process of the sliding bearing, the temperature of the sliding bearing can be adjusted by adjusting the flow of the lubricating liquid through the switch of the electromagnetic valve, so that the cooling in the working process of the sliding bearing is realized;

in addition, the pump shaft 12 can be formed by connecting a plurality of connecting shafts through a coupling assembly, and the coupling assembly comprises an elastic block 30, so that the plurality of connecting shafts are flexibly connected, and the sliding bearing does not bear the weight of the whole rotor of the pump when in work, thereby solving the problems of difficult transportation and installation caused by long submerged length of the long-shaft pump and the problems of large vibration and noise when the long-shaft pump is used and operated, improving the operation safety and reliability of the pump and prolonging the service life of the long-shaft pump;

finally, a flushing cavity 43 is formed among the guide vane 41, the second sliding bearing 35 and the second sleeve 34, the guide vane 41 is provided with a flushing hole 31, the flushing hole 31 and the flushing cavity 43 are communicated to form a flushing channel, and before the long-shaft pump is started or after the long-shaft pump is used, the flushing hole 31 can be connected with flushing equipment to flush gaps between the guide vane 41 and the pump shaft 12, so that particle impurities in pumped liquid are prevented from remaining between the guide vane 41 and the pump shaft 12, abrasion of the pump shaft 12 or the guide vane 41 caused by the next starting is avoided, and the service lives of the guide vane 41 and the pump shaft 12 are prolonged.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used herein to describe various information, but such information should not be limited to these terms, which are merely used to distinguish one type of information from another. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the invention.

The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.

Claims

1. The vertical submerged long shaft pump is characterized by comprising a control unit, a connecting pipe, a pump shaft, an impeller assembly, a protection pipe, a first bearing assembly, a shaft seal assembly and a fixing nut, wherein the impeller assembly, the protection pipe, the first bearing assembly, the shaft seal assembly and the fixing nut are arranged on the pump shaft;

the shaft seal assembly is connected with a liquid inlet and outlet pipe, the liquid inlet and outlet pipe is provided with a first electromagnetic valve, and the first electromagnetic valve is electrically connected with the control unit;

the pump shaft comprises a first coupling shaft, a second coupling shaft and a coupling assembly, wherein the coupling assembly comprises a first coupling, an elastic block and a second coupling, the first coupling is arranged on the first coupling shaft, the second coupling shaft is arranged on the second coupling shaft, the elastic block is respectively connected with the first coupling shaft and the second coupling shaft, and a first gap is reserved between the first coupling and the second coupling;

the thrust disc is provided with an upper friction surface, a lower friction surface and a side friction surface, the first sliding bearing is provided with a radial lubrication groove and an axial lubrication groove, and the balance chamber is formed by combining the lower friction surface with the radial lubrication groove and the side friction surface with the axial lubrication groove.

2. The vertical submerged long axis pump of claim 1, wherein the pump chamber is provided with a pressure detector, the pressure detector being electrically connected to a control unit.

3. The vertical submerged long axis pump of claim 1, wherein the pump shaft sleeve is provided with a first throttling sleeve that is disposed between the lubrication chamber and the flushing chamber.

4. The vertical submerged long-axis pump according to claim 3, further comprising a water outlet bell mouth, wherein the water outlet bell mouth is fixedly connected with the connecting pipe and the impeller assembly respectively, the pump shaft sleeve is provided with a second throttling sleeve, a second shaft seal is arranged between the water outlet bell mouth and the second throttling sleeve, the pump shaft is provided with a second shaft seal gland and is matched with the second shaft seal, the water outlet bell mouth is provided with a lubricating liquid hole, a shaft seal chamber and an orifice, the second shaft seal gland is provided with a liquid outlet hole, the lubricating liquid hole is communicated with the pump cavity through the liquid outlet hole, the lubricating liquid hole is connected with a liquid inlet pipe, the liquid inlet pipe is provided with a regulating valve, the liquid inlet pipe is provided with a temperature detection probe and a first pressure detection probe, and the regulating valve, the temperature detection probe and the first pressure detection probe are all electrically connected with the control unit.

5. The vertical submerged long axis pump of claim 4, wherein the flushing port is connected with a flushing pipe, the flushing pipe is provided with a second solenoid valve, a second pressure detection probe and a third solenoid valve, and the second solenoid valve, the second pressure detection probe and the third solenoid valve are all electrically connected with the control unit.

6. The vertical submerged long axis pump of claim 1, wherein the first bearing housing is provided with a liquid collecting chamber for collecting liquid leaking from the shaft seal assembly, the liquid collecting chamber being connected with a liquid drain.

7. The vertical submerged long shaft pump of claim 1, wherein the shaft seal assembly comprises a shaft seal seat, a first shaft seal and a first shaft seal gland, the shaft seal seat is fixedly connected with the first bearing seat, the pump shaft is sleeved with a first shaft sleeve, the first shaft seal is sleeved on the outer side of the first shaft sleeve, the first shaft seal gland is arranged on the shaft seal seat and used for fixing the first shaft seal, the first shaft sleeve is abutted to one end of the thrust disc, the fixing nut is in threaded connection with the pump shaft and used for fixing the first shaft sleeve and the thrust disc, the shaft seal seat is provided with a thrust ring through a screw, and a second gap can be formed between the thrust ring and a friction surface on the thrust disc.

8. The vertical submerged long-axis pump of claim 1, wherein a thrust disc is arranged between the guide vane and the impeller, the thrust disc is sleeved on the pump shaft, a third gap is formed between the thrust disc and the second sliding bearing, and a fourth gap is formed between the impeller and the guide vane.