CN111287982A - Centrifugal pump and electric submersible pump unit - Google Patents
Centrifugal pump and electric submersible pump unit Download PDFInfo
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- CN111287982A CN111287982A CN201811494020.3A CN201811494020A CN111287982A CN 111287982 A CN111287982 A CN 111287982A CN 201811494020 A CN201811494020 A CN 201811494020A CN 111287982 A CN111287982 A CN 111287982A
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- pump
- thrust bearing
- assembly
- impeller
- shaft
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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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
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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
- F04D13/10—Units comprising pumps and their driving means the pump being electrically driven for submerged use adapted for use in mining bore holes
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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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/041—Axial thrust balancing
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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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a centrifugal pump and an electric submersible pump unit, and belongs to the field of oil and gas exploitation equipment. The method comprises the following steps: the multi-stage blade guide wheel comprises a pump shell, an upper joint component, a lower joint component, a pump shaft and a multi-stage blade guide wheel, wherein the upper joint component and the lower joint component are respectively fixedly arranged at two ends of the pump shell; each stage of impeller guide wheel comprises an impeller and a guide shell, one end of the impeller is fixedly arranged on the pump shaft, the guide shell is fixedly arranged on the inner wall of the pump shell, and the impeller is positioned in a cavity of the guide shell; a first thrust bearing assembly is arranged between the multistage guide wheel and the upper joint assembly and is used for limiting the pump shaft to move towards the direction close to the upper joint assembly. According to the invention, the first thrust bearing assembly is arranged between the multistage vane guide wheel and the upper joint assembly, so that the displacement range of the centrifugal pump is expanded, and when the centrifugal pump is applied to the electric submersible pump unit, the application range of the electric submersible pump unit can be correspondingly expanded, so that the electric submersible pump unit can be applicable to various complicated application fields.
Description
Technical Field
The invention relates to the field of oil and gas exploitation equipment, in particular to a centrifugal pump and an electric submersible pump unit.
Background
At present, when an oil-water well is exploited, an electric submersible pump unit is generally adopted to lift liquid in the oil-water well to the ground. An electric submersible pump unit generally consists of a centrifugal pump, a separator, a protector and a motor. The electric submersible pump unit comprises a motor, a separator, a protector, a centrifugal pump, a separator shaft, a separator shaft, a pump shaft, a separator, a pump shaft, a separator, a centrifugal pump, a separator shaft, a separator, a pump shaft, a separator and a pump shaft, wherein the motor is usually arranged at the lowest end of. The centrifugal pump is generally a multistage centrifugal pump, and includes a pump shaft, a multistage vane guide wheel sleeved on the pump shaft, and a pump casing. Each stage of impeller guide wheel comprises an impeller and a guide shell, the impellers and the guide shells in the multistage impeller guide wheel are alternately arranged, one end of the impeller is fixedly arranged on the pump shaft, and the guide shell is fixedly arranged on the pump shell. The impeller is provided with an impeller flow passage, the guide shell is provided with a guide shell flow passage, and the impeller flow passage and the guide shell flow passage in the multistage impeller guide wheel are sequentially communicated.
In the process of exploiting an oil-water well by adopting the electric submersible pump unit, the electric submersible pump unit is usually submerged in liquid in the oil-water well, a pump shaft of the centrifugal pump is driven by a motor to rotate so as to drive an impeller to rotate at a high speed, and in the process of rotating the impeller at the high speed, the liquid in the centrifugal pump obtains potential energy and is transmitted to a pump outlet of the centrifugal pump through an impeller flow passage and a guide shell flow passage. Because the impeller generates unbalanced axial force in the rotation process, when the resultant force of the unbalanced axial force is downward, the lower surface of the impeller may contact the guide shell, and when the resultant force of the unbalanced axial force is upward, the upper surface of the impeller may contact the guide shell, thereby causing the impeller to be abraded with the guide shell in the rotation process.
In the related art, in order to prevent the impeller and the guide shell from being worn due to contact during the operation of the centrifugal pump, so as to prolong the service life of the centrifugal pump, the centrifugal pump is usually operated within a recommended displacement range, that is, an optimal displacement range of the centrifugal pump. This recommended displacement range is generally set smaller to improve the reliability of use of the centrifugal pump. The displacement of a centrifugal pump generally represents the amount of liquid a centrifugal pump discharges during a day of pump rotation.
However, in the related art, the centrifugal pump needs to work within the recommended displacement range, and the recommended displacement range is small, so that the application limitation of the electric submersible pump unit is high.
Disclosure of Invention
The embodiment of the invention provides a centrifugal pump and an electric submersible pump unit, and can solve the problem that the electric submersible pump unit in the related technology is high in application limitation. The technical scheme is as follows:
in a first aspect, there is provided a centrifugal pump comprising:
the multi-stage impeller pump comprises a pump shell, an upper joint assembly, a lower joint assembly, a pump shaft and a multi-stage impeller guide wheel, wherein the upper joint assembly and the lower joint assembly are respectively and fixedly arranged at two ends of the pump shell;
each stage of the blade guide wheel comprises an impeller and a guide shell, one end of the impeller is fixedly arranged on the pump shaft, the guide shell is fixedly arranged on the inner wall of the pump shell, and the impeller is positioned in a cavity of the guide shell;
a first thrust bearing assembly is arranged between the multistage guide wheel and the upper joint assembly and is used for limiting the pump shaft to move towards the direction close to the upper joint assembly;
the first thrust bearing assembly comprises a thrust bearing seat, a thrust bearing static block and a thrust bearing moving block, the thrust bearing seat is fixedly arranged on the upper joint assembly, the thrust bearing static block is fixedly clamped on the thrust bearing seat, the thrust bearing moving block is fixedly arranged on the pump shaft, and the orthographic projection of the thrust bearing static block on the multistage guide wheel and the orthographic projection of the thrust bearing moving block on the multistage guide wheel are overlapped.
Optionally, the thrust bearing static block abuts against the pump shaft, a liquid flow channel is arranged on the thrust bearing seat, and a misalignment region exists between an orthographic projection of the liquid flow channel on the multistage vane wheel and an orthographic projection of the thrust bearing moving block on the multistage vane wheel.
Optionally, the centrifugal pump further comprises: the clamping ring is positioned between the multistage guide vane wheel and the thrust bearing moving block, the clamping ring is fixedly arranged on the pump shaft, and the compression assembly is positioned between the lower joint assembly and the multistage guide vane wheel;
the clamping ring and the pressing assembly are used for fixing the multistage guide wheel.
Optionally, the compressing assembly comprises a compressing sleeve, a compressing locking nut assembly and a compressing support structure;
the compressing sleeve and the compressing support structure are fixedly arranged on the pump shell, one end of the compressing sleeve is abutted against the lower end of the multistage guide wheel, and the other end of the compressing sleeve is abutted against the compressing support structure;
the compression sleeve and the compression support structure are used for fixing a guide shell in the multistage impeller;
the compressing and locking nut assembly is fixedly sleeved on the pump shaft, and the clamping ring and the compressing and locking nut assembly are used for fixing the impeller in the multistage impeller guide wheel.
Optionally, when the centrifugal pump is in an inoperative state, a gap exists between the thrust bearing static block and the thrust bearing dynamic block, and the gap is smaller than a distance between the impeller and the guide housing in an extending direction of the pump shaft in each stage of the impeller guide wheel.
In a second aspect, there is provided an electrical submersible pump assembly comprising: a centrifugal pump as claimed in any one of the first aspect.
Optionally, the submersible pump assembly further includes: a motor and a protector;
the motor is used for driving the pump shaft to rotate;
the protector is used for protecting the motor.
Optionally, the protector comprises a second thrust bearing assembly;
the second thrust bearing assembly is configured to limit movement of the pump shaft in a direction proximate the lower joint assembly.
Optionally, the submersible pump assembly further includes: a separator located between the centrifugal pump and the protector;
the separator is used for carrying out gas-liquid separation treatment on liquid and transmitting the liquid subjected to the gas-liquid separation treatment into the centrifugal pump through the lower joint assembly of the centrifugal pump.
Optionally, the top end of a motor shaft of the motor is fixedly connected to the bottom end of a protector shaft of the protector, the top end of the protector shaft is fixedly connected to the bottom end of a separator shaft of the separator, and the top end of the separator shaft is fixedly connected to the bottom end of the pump shaft.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the centrifugal pump and the electric submersible pump unit provided by the embodiment of the invention, the first thrust bearing assembly is arranged between the multistage vane guide wheel and the upper joint assembly, when the discharge capacity of the centrifugal pump is larger than the upper limit of a recommended discharge capacity range set in the related art, the impeller drives the pump shaft to move upwards under the action of an upward unbalanced axial force generated by the rotation of the impeller in the multistage vane guide wheel, the first thrust bearing assembly can limit the pump shaft to move towards the direction close to the upper joint assembly, namely the first thrust bearing assembly can realize the unloading of the upward unbalanced axial force generated by the rotation of the impeller, and further the upper surface of the impeller can be prevented from being contacted with the guide shell. Therefore, the maximum displacement of the centrifugal pump provided by the embodiment of the invention can be larger than the upper limit of the recommended displacement range set in the related technology, namely, the displacement range of the centrifugal pump is expanded by the embodiment of the invention, and when the centrifugal pump is applied to an electric submersible pump unit, the application range of the electric submersible pump unit can be correspondingly expanded, so that the electric submersible pump unit can be applied to various complicated application fields.
Drawings
FIG. 1 is a schematic diagram of a centrifugal pump according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electric submersible pump assembly provided by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a centrifugal pump according to an embodiment of the present invention, and as shown in fig. 1, the centrifugal pump 10 includes:
the multi-stage impeller pump comprises a pump shell 101, an upper joint assembly 102 and a lower joint assembly 103 which are fixedly arranged at two ends of the pump shell 101 respectively, a pump shaft 104 positioned in the pump shell 101 and a multi-stage impeller 105 sleeved on the pump shaft 104.
Referring to fig. 1, each stage of vane guide wheel 105 includes an impeller 105a and a guide shell 105b, one end of the impeller 105a is fixedly disposed on the pump shaft 104, the guide shell 105b is fixedly disposed on the inner wall of the pump casing 101, and the impeller 105a is located in the cavity of the guide shell 105 b; a first thrust bearing assembly 106 is disposed between the multi-stage guide pulley 105 and the upper joint assembly 102, and the first thrust bearing assembly 106 is configured to limit movement of the pump shaft 104 in a direction closer to the upper joint assembly 102.
Referring to fig. 1, the first thrust bearing assembly 106 includes a thrust bearing housing 106a, a thrust bearing stationary block 106b, and a thrust bearing moving block 106 c; thrust bearing seat 106a is fixedly arranged on upper joint assembly 102, thrust bearing static block 106b is fixedly clamped on thrust bearing seat 106a, thrust bearing dynamic block 106c is fixedly arranged on pump shaft 104, and the orthographic projection of thrust bearing static block 106b on multistage guide vane wheel 105 and the orthographic projection of thrust bearing dynamic block 106c on multistage guide vane wheel 105 have an overlapping region.
It should be noted that, there is the coincidence region in the orthographic projection of thrust bearing stator block on multistage leaf guide pulley and the orthographic projection of thrust bearing movable block on multistage leaf guide pulley, can guarantee when thrust bearing movable block moves up along with pump shaft and impeller, thrust bearing movable block and thrust bearing stator block contact to play the effect of restriction pump shaft towards the direction removal that is close to the top connection subassembly.
The working process of the centrifugal pump provided by the embodiment of the invention comprises the following steps: the impeller is driven to rotate at high speed through the rotation of the pump shaft; in the process of high-speed rotation of the impeller, liquid in the centrifugal pump obtains potential energy, and the potential energy sequentially passes through an impeller flow passage (liquid flow passage in the impeller) and a guide shell flow passage (liquid flow passage in the guide shell) in the multistage impeller guide wheel, and then is transmitted to a pump outlet of the centrifugal pump after passing through the liquid flow passage in the first thrust bearing assembly and the upper joint assembly.
Centrifugal pumps in the related art are generally provided with a recommended displacement range. When the discharge capacity of the centrifugal pump is larger than the upper limit of the recommended discharge capacity range, the resultant force of unbalanced axial forces generated by the rotation of the impellers in the multi-stage impeller wheels is upward. In the embodiment of the invention, the impeller is fixedly arranged on the pump shaft, the impeller and the pump shaft move upwards under the action of the upward unbalanced axial force, and the first thrust bearing assembly positioned between the multistage impeller guide wheel and the upper joint assembly can limit the pump shaft to move towards the direction close to the upper joint assembly, namely the first thrust bearing assembly can realize unloading of the upward unbalanced axial force generated by the rotation of the impeller (namely removing the force borne by an object), so that the upper surface of the impeller can be prevented from contacting with the guide shell. Therefore, the discharge capacity of the centrifugal pump provided by the embodiment of the invention can be larger than the upper limit of the recommended discharge capacity range set in the related art, and meanwhile, the upper surface of the impeller and the guide shell can be ensured not to be contacted all the time so as to avoid abrasion.
In summary, in the centrifugal pump provided in the embodiments of the present invention, the first thrust bearing assembly is disposed between the multistage vane guide wheel and the upper joint assembly, when the displacement of the centrifugal pump is greater than the recommended displacement range set in the related art, under the action of the upward unbalanced axial force generated by the rotation of the impeller in the multistage vane guide wheel, the impeller drives the pump shaft to move upward, and the first thrust bearing assembly can limit the pump shaft to move toward the direction close to the upper joint assembly, that is, the first thrust bearing assembly can unload the upward unbalanced axial force generated by the rotation of the impeller, so as to prevent the upper surface of the impeller from contacting the guide shell. Therefore, the maximum displacement of the centrifugal pump provided by the embodiment of the invention can be larger than the upper limit of the recommended displacement range set in the related technology, namely, the displacement range of the centrifugal pump is expanded by the embodiment of the invention, and when the centrifugal pump is applied to an electric submersible pump unit, the application range of the electric submersible pump unit can be correspondingly expanded, so that the electric submersible pump unit can be applied to various complicated application fields.
Alternatively, when the centrifugal pump is in a non-operating state, referring to fig. 1, a gap exists between the thrust bearing static block 106b and the thrust bearing dynamic block 106c, and the gap is smaller than the distance between the impeller 105a and the guide housing 105b in the extending direction of the pump shaft 104 in each stage of the impeller wheel 105.
In the working process of the centrifugal pump shown in fig. 1, when the impeller in the multistage impeller rotates to generate an upward unbalanced axial force, the impeller drives the pump shaft to move upwards, and the thrust bearing moving block is fixedly arranged on the pump shaft, so the thrust bearing moving block moves upwards along with the pump shaft. When the thrust bearing movable block contacts with the thrust bearing static block, the force borne by the thrust bearing movable block is transmitted to the thrust bearing static block, and unloading of the force on the impeller, the pump shaft and the thrust bearing movable block is completed.
Optionally, as shown in fig. 1, the thrust bearing static block 106b abuts against the pump shaft 104, a liquid flow passage L is arranged on the thrust bearing block 106a, and an area where an orthographic projection of the liquid flow passage L on the multistage vane wheel and an orthographic projection of the thrust bearing dynamic block 106c on the multistage vane wheel do not overlap exists.
It should be noted that, by arranging the liquid flow passage on the thrust bearing seat, and the orthographic projection of the liquid flow passage on the multistage vane guide wheel and the orthographic projection of the thrust bearing moving block on the multistage vane guide wheel have a non-coincident region, the liquid flowing out from the multistage vane guide wheel can be transmitted to the pump outlet after passing through the liquid flow passage, so as to realize the liquid discharge function of the centrifugal pump.
Optionally, the shapes of the thrust bearing static block and the thrust bearing moving block are matched, for example, the size of the contact surface of the thrust bearing static block is the same as that of the contact surface of the thrust bearing moving block, so that the force on the thrust bearing moving block is better transmitted to the thrust bearing static block, and the unloading of the force on the thrust bearing moving block is realized. The thrust bearing movable block can be made of an elastically deformable material so as to avoid the instant thrust bearing movable block from being broken when the thrust bearing movable block is contacted with the thrust bearing static block.
Optionally, referring to fig. 1, the centrifugal pump 10 further comprises: the clamping ring 107 is positioned between the multistage guide vane wheel 105 and the thrust bearing block 106c, the clamping ring 107 is fixedly arranged on the pump shaft 104, and the pressing assembly 108 is positioned between the lower joint assembly 103 and the multistage guide vane wheel 105; snap ring 107 and hold down assembly 108 are used to secure multi-stage impeller 105.
Optionally, referring to fig. 1, the compression assembly 108 includes a compression sleeve 108a, a compression lock nut assembly 108b and a compression support structure 108 c; the pressing sleeve 108a and the pressing support structure 108c are fixedly arranged on the pump shell 101, one end of the pressing sleeve 108a is abutted with the lower end of the multistage vane guide wheel 105, the other end of the pressing sleeve 108a is abutted with the pressing support structure 108c, and the pressing sleeve 108a and the pressing support structure 108c are used for fixing the guide shell 105b in the multistage vane guide wheel 105; the compression lock nut assembly 108b is fixedly sleeved on the pump shaft 104, and the clamping ring 107 and the compression lock nut assembly 108b are used for fixing the impeller 105a in the multi-stage impeller 105.
The impeller and the pump shaft can be ensured to be fixed in relative position through the clamping ring and the pressing locking nut assembly, namely, the impeller is ensured to be immovable relative to the pump shaft in the extending direction of the pump shaft.
In summary, in the centrifugal pump provided in the embodiments of the present invention, the first thrust bearing assembly is disposed between the multistage vane guide wheel and the upper joint assembly, when the displacement of the centrifugal pump is greater than the recommended displacement range set in the related art, under the action of the upward unbalanced axial force generated by the rotation of the impeller in the multistage vane guide wheel, the impeller drives the pump shaft to move upward, and the first thrust bearing assembly can limit the pump shaft to move toward the direction close to the upper joint assembly, that is, the first thrust bearing assembly can unload the upward unbalanced axial force generated by the rotation of the impeller, so as to prevent the upper surface of the impeller from contacting the guide shell. Therefore, the maximum displacement of the centrifugal pump provided by the embodiment of the invention can be larger than the upper limit of the recommended displacement range set in the related technology, namely, the displacement range of the centrifugal pump is expanded by the embodiment of the invention, and when the centrifugal pump is applied to an electric submersible pump unit, the application range of the electric submersible pump unit can be correspondingly expanded, so that the electric submersible pump unit can be applied to various complicated application fields.
The embodiment of the invention also provides an electric submersible pump unit, which comprises: such as centrifugal pump 10 shown in fig. 1.
Referring to fig. 1, a centrifugal pump 10 includes: the device comprises a pump shell 101, an upper joint assembly 102 and a lower joint assembly 103 which are respectively and fixedly arranged at two ends of the pump shell 101, a pump shaft 104 positioned in the pump shell 101 and a multi-stage guide wheel 105 sleeved on the pump shaft 104; each stage of blade guide wheel 105 comprises an impeller 105a and a guide shell 105b, one end of the impeller 105a is fixedly arranged on the pump shaft 104, the guide shell 105b is fixedly arranged on the inner wall of the pump shell 101, and the impeller 105a is positioned in the cavity of the guide shell 105 b; a first thrust bearing assembly 106 is disposed between the multi-stage guide pulley 105 and the upper joint assembly 102, and the first thrust bearing assembly 106 is configured to limit movement of the pump shaft 104 in a direction closer to the upper joint assembly 102.
In summary, the electric submersible pump unit provided in the embodiment of the present invention includes a centrifugal pump, and the first thrust bearing assembly is disposed between the multistage vane guide wheel and the upper joint assembly, so that when the displacement of the centrifugal pump is greater than the recommended displacement range set in the related art, under the action of the upward unbalanced axial force generated by the rotation of the impeller in the multistage vane guide wheel, the impeller drives the pump shaft to move upward, the first thrust bearing assembly can limit the pump shaft to move toward the direction close to the upper joint assembly, that is, the first thrust bearing assembly can unload the upward unbalanced axial force generated by the rotation of the impeller, and further can prevent the upper surface of the impeller from contacting the guide shell. Therefore, the maximum displacement of the centrifugal pump provided by the embodiment of the invention can be larger than the upper limit of the recommended displacement range set in the related technology, namely the embodiment of the invention enlarges the displacement range of the centrifugal pump, and further enlarges the application range of the electric submersible pump unit, so that the electric submersible pump unit can be suitable for various complicated application fields.
Optionally, fig. 2 is a schematic structural diagram of an electric submersible pump assembly according to an embodiment of the present invention, and as shown in fig. 2, the electric submersible pump assembly further includes: motor 20 and protector 30; the motor 20 is used for driving the pump shaft 104 to rotate; the protector 30 serves to protect the motor 20.
Wherein, the protector seals the power end of the motor to prevent the liquid from corroding the power end of the motor.
Optionally, referring to fig. 2, the submersible pump assembly further includes: a separator 40, the separator 40 being located between the centrifugal pump 10 and the protector 30.
The separator 40 is configured to perform gas-liquid separation on the liquid, and transmit the liquid after the gas-liquid separation into the centrifugal pump 10 through the lower joint assembly of the centrifugal pump 10.
It should be noted that, by arranging the separator between the centrifugal pump and the protector, when the liquid contains free gas, the separator can perform gas-liquid separation treatment on the liquid, so that the liquid entering the centrifugal pump contains little or no gas. On one hand, free gas can be prevented from occupying an impeller flow passage and a guide shell flow passage of the centrifugal pump, and the phenomenon that the centrifugal pump cannot discharge liquid due to air lock is prevented; on the other hand, the cavitation erosion of the impeller in the high-speed rotation process of the impeller can be avoided after the free gas enters the impeller flow channel and the guide shell flow channel.
Optionally, in the electric submersible pump unit, the top end of the motor shaft is fixedly connected with the bottom end of a protector shaft of the protector, the top end of the protector shaft is fixedly connected with the bottom end of a separator shaft of the separator, and the top end of the separator shaft is fixedly connected with the bottom end of the pump shaft.
It should be noted that the motor is used to power the separator and the centrifugal pump. In the working process of the electric submersible pump unit, the protector shaft, the separator shaft and the centrifugal pump shaft are driven to rotate through the rotation of the motor shaft. The separator realizes the gas-liquid separation of liquid through the rotation of the separator shaft, and the centrifugal pump realizes the liquid discharge function through the rotation of the centrifugal pump shaft.
Optionally, the separator may be replaced with a suction inlet assembly when the liquid contains no free gas or a low amount of free gas. The suction port assembly is used to deliver liquid into the centrifugal pump.
Optionally, the protector comprises a second thrust bearing assembly; the second thrust bearing assembly is adapted to limit movement of the pump shaft in a direction proximate the lower joint assembly. The second thrust bearing can comprise a second thrust bearing static block and a second thrust bearing moving block, the second thrust bearing static block is fixedly arranged on the shell of the protector, and the second thrust bearing moving block is fixedly arranged on the protector shaft. The working principle of the second thrust bearing assembly can refer to the working principle of the first thrust bearing assembly, and the embodiment of the invention is not described herein.
In the working process of the electric submersible pump unit provided by the embodiment of the invention, when the displacement of the centrifugal pump is larger than the upper limit of the recommended displacement range set in the related technology, the impeller drives the pump shaft to move upwards under the action of an upward unbalanced axial force generated by the rotation of the impeller in the multi-stage impeller guide wheel, and at the moment, the first thrust bearing assembly can limit the pump shaft to move towards the direction close to the upper joint assembly, namely the first thrust bearing assembly can unload the upward unbalanced axial force generated by the rotation of the impeller, so that the upper surface of the impeller can be prevented from being contacted with the guide shell; when the discharge capacity of the centrifugal pump is smaller than the recommended discharge capacity range set in the related art, the impeller drives the pump shaft to move downwards under the action of downward unbalanced axial force generated by rotation of the impeller in the multi-stage impeller guide wheel, the second thrust bearing assembly can limit the pump shaft to move towards the direction close to the lower joint assembly at the moment, namely the second thrust bearing assembly can realize unloading of the downward unbalanced axial force generated by rotation of the impeller, and further the contact between the lower surface of the impeller and the guide shell can be avoided. Therefore, the maximum displacement of the centrifugal pump provided by the embodiment of the invention can be larger than the recommended displacement range set in the related technology, and the minimum displacement can be smaller than the lower limit of the recommended displacement range set in the related technology, so that the displacement range of the centrifugal pump is further expanded.
In summary, the electric submersible pump unit provided by the embodiment of the invention includes a centrifugal pump, and the first thrust bearing assembly is arranged between the multistage vane guide wheel and the upper joint assembly, so that when the displacement of the centrifugal pump is larger than the upper limit of the recommended displacement range set in the related art, under the action of upward unbalanced axial force generated by the rotation of the impeller in the multistage vane guide wheel, the impeller drives the pump shaft to move upwards, the first thrust bearing assembly can limit the pump shaft to move towards the direction close to the upper joint assembly, and further, the upper surface of the impeller can be prevented from contacting with the guide shell; when the discharge capacity of the centrifugal pump is smaller than the lower limit of the recommended discharge capacity range set in the related art, the impeller drives the pump shaft to move downwards under the action of downward unbalanced axial force generated by rotation of the impeller in the multi-stage impeller guide wheel, and the second thrust bearing assembly can limit the pump shaft to move towards the direction close to the lower joint assembly, so that the contact between the lower surface of the impeller and the guide shell can be avoided. Therefore, compared with the related art, the centrifugal pump provided by the embodiment of the invention enlarges the displacement range of the centrifugal pump, and further enlarges the application range of the electric submersible pump unit, so that the electric submersible pump unit can be suitable for various complex application fields.
The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The invention is not to be considered as limited to the particular embodiments shown and described, but is to be understood that various modifications, equivalents, improvements and the like can be made without departing from the spirit and scope of the invention.
Claims (10)
1. A centrifugal pump, comprising:
the device comprises a pump shell (101), an upper joint assembly (102) and a lower joint assembly (103) which are respectively and fixedly arranged at two ends of the pump shell (101), a pump shaft (104) positioned in the pump shell (101) and a multi-stage blade guide wheel (105) sleeved on the pump shaft (104);
each stage of the guide wheel (105) comprises an impeller (105a) and a guide shell (105b), one end of the impeller (105) is fixedly arranged on the pump shaft (104), the guide shell (105b) is fixedly arranged on the inner wall of the pump shell (101), and the impeller (105a) is positioned in a cavity of the guide shell (105 b);
a first thrust bearing assembly (106) is arranged between the multistage guide wheel (105) and the upper joint assembly (102), and the first thrust bearing assembly (106) is used for limiting the pump shaft (104) to move towards the direction close to the upper joint assembly (102);
the first thrust bearing assembly (106) comprises a thrust bearing seat (106a), a thrust bearing static block (106b) and a thrust bearing dynamic block (106c), the thrust bearing seat (106a) is fixedly arranged on the upper joint assembly (102), the thrust bearing static block (106b) is fixedly clamped on the thrust bearing seat (106a), the thrust bearing dynamic block (106c) is fixedly arranged on the pump shaft (104), and an overlapping area exists between the orthographic projection of the thrust bearing static block (106b) on the multistage guide wheel (105) and the orthographic projection of the thrust bearing dynamic block (106c) on the multistage guide wheel (105).
2. The centrifugal pump according to claim 1, wherein the thrust bearing static block (106b) abuts against the pump shaft (104), a liquid flow passage (L) is arranged on the thrust bearing block (106a), and an area where an orthographic projection of the liquid flow passage (L) on the multistage guide vane wheel (105) and an orthographic projection of the thrust bearing dynamic block (106c) on the multistage guide vane wheel (105) are misaligned exists.
3. The centrifugal pump according to claim 1 or 2, further comprising: a clamping ring (107) and a pressing assembly (108), wherein the clamping ring (107) is positioned between the multistage guide vane wheel (105) and the thrust bearing block (106c), the clamping ring (107) is fixedly arranged on the pump shaft (104), and the pressing assembly (108) is positioned between the lower joint assembly (103) and the multistage guide vane wheel (105);
the clamping ring (107) and the pressing assembly (108) are used for fixing the multistage guide wheel (105).
4. A centrifugal pump according to claim 3, wherein the compression assembly (108) comprises a compression sleeve (108a), a compression lock nut assembly (108b) and a compression support structure (108 c);
the pressing sleeve (108a) and the pressing support structure (108c) are fixedly arranged on the pump shell (101), one end of the pressing sleeve (108a) is abutted against the lower end of the multistage guide wheel (105), and the other end of the pressing sleeve (108a) is abutted against the pressing support structure (108 c);
the pressing sleeve (108a) and the pressing support structure (108c) are used for fixing a guide shell (105b) in the multi-stage guide wheel (105);
the compression lock nut assembly (108b) is fixedly sleeved on the pump shaft (104), and the clamping ring (107) and the compression lock nut assembly (108b) are used for fixing an impeller (105a) in the multistage guide wheel (105).
5. A centrifugal pump according to claim 1 or 2,
when the centrifugal pump is in a non-working state, a gap exists between the thrust bearing static block (106b) and the thrust bearing moving block (106c), and the gap is smaller than the distance between the impeller (105a) and the guide shell (105b) in the extension direction of the pump shaft (104) in each stage of the guide wheel (105).
6. An electrical submersible pump assembly, comprising: the centrifugal pump (10) of any one of claims 1 to 5.
7. The electrical submersible pump assembly as recited in claim 6, further comprising: a motor (20) and a protector (30);
the motor (20) is used for driving the pump shaft (104) to rotate;
the protector (30) is used for protecting the motor (20).
8. Electric submersible pump assembly according to claim 7, characterized in that the protector (30) comprises a second thrust bearing assembly;
the second thrust bearing assembly is used for limiting the pump shaft (104) to move towards the direction close to the lower joint assembly (103).
9. An electric submersible pump assembly as set forth in claim 7 or 8, further comprising: a separator (40), the separator (40) being located between the centrifugal pump (10) and the protector (30);
the separator (40) is used for carrying out gas-liquid separation treatment on liquid and transmitting the liquid subjected to the gas-liquid separation treatment into the centrifugal pump (10) through a lower joint component of the centrifugal pump (10).
10. The submersible pump assembly of claim 9,
the top end of a motor shaft of the motor (20) is fixedly connected with the bottom end of a protector shaft of the protector (30), the top end of the protector shaft is fixedly connected with the bottom end of a separator shaft of the separator (40), and the top end of the separator shaft is fixedly connected with the bottom end of the pump shaft (104).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811494020.3A CN111287982B (en) | 2018-12-07 | 2018-12-07 | Centrifugal pump and electric submersible pump unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811494020.3A CN111287982B (en) | 2018-12-07 | 2018-12-07 | Centrifugal pump and electric submersible pump unit |
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| Publication Number | Publication Date |
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| CN111287982A true CN111287982A (en) | 2020-06-16 |
| CN111287982B CN111287982B (en) | 2021-08-31 |
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| CN201811494020.3A Active CN111287982B (en) | 2018-12-07 | 2018-12-07 | Centrifugal pump and electric submersible pump unit |
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| CN (1) | CN111287982B (en) |
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| CN203051157U (en) * | 2012-12-17 | 2013-07-10 | 陕西中明能源投资有限公司 | Motor-driven oil-submerged pump |
| CN206874496U (en) * | 2017-06-27 | 2018-01-12 | 胜利油田胜利泵业有限责任公司 | Oil-submersible anticorrosive electric pump unit |
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| CN2082325U (en) * | 1990-08-06 | 1991-08-07 | 王科社 | Static pressure thrust bearing of submersible pump in deep well |
| CN2307131Y (en) * | 1997-02-18 | 1999-02-10 | 胜利石油管理局胜利采油厂 | Electric submersible sand-proof centrifugal pump |
| CN2355136Y (en) * | 1998-11-16 | 1999-12-22 | 胜利石油管理局无杆采油泵公司 | Electric upside downward water filling pump |
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| Publication number | Publication date |
|---|---|
| CN111287982B (en) | 2021-08-31 |
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