CN113062858A - Integrated all-metal screw pump oil production device with external rotor and pump - Google Patents
Integrated all-metal screw pump oil production device with external rotor and pump Download PDFInfo
- Publication number
- CN113062858A CN113062858A CN202110427413.8A CN202110427413A CN113062858A CN 113062858 A CN113062858 A CN 113062858A CN 202110427413 A CN202110427413 A CN 202110427413A CN 113062858 A CN113062858 A CN 113062858A
- Authority
- CN
- China
- Prior art keywords
- screw pump
- driving shaft
- rotor
- pump
- seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/128—Adaptation of pump systems with down-hole electric drives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
- F04C13/001—Pumps for particular liquids
- F04C13/002—Pumps for particular liquids for homogeneous viscous liquids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
- F04C13/005—Removing contaminants, deposits or scale from the pump; Cleaning
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
- F04C13/008—Pumps for submersible use, i.e. down-hole pumping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/008—Prime movers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0088—Lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0096—Heating; Cooling
Abstract
The invention relates to a screw pump oil production device, in particular to a machine-pump integrated all-metal screw pump oil production device with an external rotor, and belongs to the technical field of oil production machinery. The all-metal screw pump comprises a shell, a machine-pump integrated all-metal screw pump positioned in the shell, a dynamic seal positioned at the lower end of the machine-pump integrated all-metal screw pump, and a motion conversion mechanism positioned at the lower end of the dynamic seal. The invention improves the trafficability of the deflecting section of the horizontal well with the middle and short curvature radius by reducing the integral length of the unit through the integrated arrangement of the pump and the motor, thereby avoiding the blockage of the unit due to scaling and the failure of well tripping and workover caused by overlong underground service time; meanwhile, the invention can be suitable for the heavy oil thermal recovery working condition by adopting the all-metal screw pump; in addition, the motion conversion mechanism can realize the cooling and lubrication of the motion conversion mechanism while completing the conversion of the rotation of the fixed shaft of the motor rotor into the eccentric rotation of the screw pump rotor relative to the screw pump bushing, thereby greatly prolonging the service life of the motion conversion mechanism.
Description
Technical Field
The invention relates to a screw pump oil production device, in particular to a machine-pump integrated all-metal screw pump oil production device with an external rotor, and belongs to the technical field of oil production machinery.
Background
In recent years, the low-speed large-torque submersible permanent magnet synchronous motor directly drives the screw pump to produce oil as a new technology to be gradually applied to oil fields, the system transmission mode is changed, a planetary gear reducer and a protector thereof are omitted, and the working principle is as follows: the submersible permanent magnet synchronous motor is arranged at the bottommost end of the underground system, a motor protector is arranged on the submersible permanent magnet synchronous motor, and a protector shaft is connected with a screw pump rotor, so that the motor directly drives the screw pump to perform oil extraction operation. Although the efficiency of the system is improved by directly driving the screw pump to produce oil by the low-speed high-torque submersible permanent magnet synchronous motor, a split structure of the motor and the pump and a transmission mode of external connection are still adopted, the size of the whole machine is still longer, the whole machine still cannot pass through the inclined section of the horizontal well with the middle and short curvature radius, the application in the horizontal well is limited, the horizontal well with the middle and short curvature radius is gradually increased, the penetrability of the inclined section of the submersible direct-drive screw pump device in the horizontal well with the middle and short curvature radius is poorer due to the longer length of the unit, and the accident that the unit can be blocked by scales or even cannot be drilled and repaired when the underground service time is too long is easily caused.
In addition, the screw pump of the existing submersible direct-drive screw pump device adopts the interference fit of a metal rotor and a rubber bushing (stator), and the metal rotor eccentrically rotates in the rubber bushing to realize the lifting of high-viscosity crude oil. At present, unconventional oil reservoirs with considerable reserves all over the world can be efficiently lifted only by thick oil thermal recovery modes such as steam injection, electric heating, solvent injection and the like, but because the rubber bushing is not resistant to high temperature, the rubber bushing can be severely deformed in a short time at high temperature, so that the screw pump cannot complete the lifting task due to failure, and the existing screw pump of the submersible direct-drive screw pump device cannot be suitable for thick oil thermal recovery.
Disclosure of Invention
The invention aims to solve the problems and provides a machine-pump integrated all-metal screw pump oil production device with an external rotor, which is characterized in that the integral length of a unit is reduced through the integral arrangement of the machine-pump to improve the trafficability of a deflecting section of a horizontal well with a medium and short curvature radius, so that the blocking of the unit due to scaling and the failure in well lifting and well repairing caused by overlong underground service time are avoided; meanwhile, the all-metal screw pump is adopted, so that the all-metal screw pump is suitable for the heavy oil thermal recovery working condition. The technical scheme is as follows:
the invention relates to an integrated all-metal screw pump oil production device of a machine pump with an external rotor, which comprises a shell, wherein the shell consists of an upper joint, a shell and a lower joint, the upper end of the shell is in threaded connection with the upper joint, and the lower end of the shell is in threaded connection with the lower joint, and the integrated all-metal screw pump oil production device is characterized in that a motor rotor, a permanent magnet, a motor stator, a screw pump shell, a screw pump bushing and a screw pump rotor are sequentially arranged above the interior of the shell from outside to inside, the permanent magnet is fixedly connected with the motor rotor, a certain gap is arranged between the motor stator and the permanent magnet, the screw pump shell is fixedly connected with the motor stator, the screw pump bushing is fixedly connected with the screw pump shell, the screw pump rotor is arranged in the screw pump bushing, the screw pump shell is fixedly connected, the upper joint is provided with a cable containing inclined hole for installing an external cable at the upper end, the lower end of the motor stator is sequentially provided with an insulating sealing washer and a dynamic seal, the dynamic seal comprises a dynamic seal moving ring and a dynamic seal static ring, the upper end of the dynamic seal moving ring is in threaded connection with the motor rotor, the lower end of the dynamic seal moving ring is in threaded connection with the driving sleeve, the dynamic seal static ring is fixedly connected with the screw pump shell, the dynamic seal moving ring is in rotational connection with the dynamic seal static ring through a bow-shaped structure and is provided with a certain gap in the radial direction, the bottom of the dynamic seal static ring extends inwards in the radial direction to form a screw pump limiting boss for axially positioning and sealing the screw pump bush, the lower end of the screw pump rotor is fixedly provided with a screw pump rotor connector, the lower end of the screw pump rotor connector is provided with a motion conversion mechanism, and the motion conversion mechanism is used for converting the The screw pump is characterized in that the core rotates, the lower end of the motion conversion mechanism is in threaded connection with the driving sleeve, the upper end of the motion conversion mechanism is in threaded connection with the screw pump rotor connector, two angular contact ball bearings are arranged between the motion conversion mechanism and the lower connector, and the two angular contact ball bearings are used for transmitting the axial force borne by the motion conversion mechanism to the shell.
As a further improvement of the invention, a first bearing and a second bearing are respectively arranged at the upper end and the lower end of the permanent magnet, inner rings of the first bearing and the second bearing are in interference connection with a motor stator, and outer rings of the first bearing and the second bearing are in interference connection with a motor rotor.
As a further improvement of the invention, the outer diameter of the motor rotor, the outer diameter of the dynamic seal rotating ring and the outer diameter of the drive sleeve are equal and are represented by D, the inner diameter of the lower end of the upper joint, the inner diameter of the shell and the inner diameter of the upper end of the lower joint are equal and are represented by D, and D is slightly smaller than D.
As a further improvement of the invention, the motion conversion mechanism comprises an upper conversion joint, a driving shaft and a lower conversion joint, wherein the upper end of the driving shaft is connected with the upper conversion joint, the lower end of the driving shaft is connected with the lower conversion joint, the upper conversion joint is in threaded connection with a screw pump rotor connector, and a plurality of upper filter screen seat accommodating cavities and fifth flow channels which are distributed in a circumferential array manner are sequentially arranged in the radial direction; the lower conversion joint is provided with a driving sleeve connector in threaded connection with a driving sleeve, the lower conversion joint is sequentially provided with a plurality of lower filter screen seat accommodating cavities and a plurality of third runners which are distributed in a circumferential array manner in the radial direction, a lower filter part is arranged in each lower filter screen seat accommodating cavity, the lower conversion joint is sequentially provided with a lower ball raceway, a fourth runner, a lower driving shaft seat accommodating cavity and a first runner in the axial direction, a lower driving shaft seat is arranged in each lower driving shaft seat accommodating cavity, an overflowing through hole is formed in the middle of each lower driving shaft seat, a lower ball is arranged in each lower ball raceway, the lower conversion joint is further provided with a plurality of second runners which are distributed in a circumferential array manner and communicated with the first runners in the radial direction, two ends of the driving shaft are respectively provided with a ball seat for placing the upper ball and the lower ball, and an upper driving shaft seat is installed in each upper conversion joint inner cavity from, The upper driving shaft pressing sleeve is in threaded connection with the upper conversion joint, the upper end of the upper driving shaft pressing sleeve is in axial positioning with the upper driving shaft second pressing seat, the inner cavity of the lower conversion joint is provided with a lower driving shaft seat, a driving shaft, a lower driving shaft first pressing seat, a lower driving shaft centering support, a lower driving shaft second pressing seat and a lower driving shaft pressing sleeve from bottom to top, the lower driving shaft pressing sleeve is in threaded connection with the lower conversion joint, the lower end of the lower driving shaft pressing sleeve is in axial positioning with the lower driving shaft second pressing seat, the upper balls and the lower balls are used for radial positioning of the driving shaft, and the upper driving shaft seat and the lower driving shaft seat are used for axial positioning of the driving shaft.
As a further improvement of the present invention, the lower filter screen seat accommodating cavity is communicated with and coaxially arranged with a third flow channel, the third flow channel is communicated with a fourth flow channel and a lower drive shaft seat accommodating cavity respectively, the axes of the fourth flow channel, the lower ball raceway and the lower drive shaft seat accommodating cavity are parallel, the upper filter screen seat accommodating cavity is communicated with and coaxially arranged with a fifth flow channel, the fifth flow channel is communicated with a sixth flow channel and an upper drive shaft seat accommodating cavity respectively, the axes of the sixth flow channel, the upper ball raceway and the upper drive shaft seat accommodating cavity are parallel, and the upper drive shaft seat accommodating cavity is communicated with and coaxially arranged with a seventh flow channel.
As a further improvement of the invention, the upper filter component comprises an upper filter screen and an upper filter screen seat, the upper filter screen is detachably mounted on the upper filter screen seat, the middle part of the upper filter screen seat is provided with a through hole for overflowing, the upper filter screen is made of a stainless steel wire mesh, and the upper filter component and the lower filter component have the same structural shape.
In a further improvement of the present invention, the upper and lower balls are made of tungsten carbide YG13, the upper and lower drive shaft centering supports are made of fluororubber, and the upper, drive shaft, and lower adapter are made of 42 CrMo.
As a further improvement of the invention, the section line types of the screw pump lining and the screw pump rotor are both short-amplitude hypocycloid equidistant types, and the head ratio of the screw pump rotor to the screw pump lining is 1:2 or 2: 3.
As a further improvement of the invention, when the all-metal screw pump oil production device is used for heavy oil thermal production, the clearance between the screw pump bushing and the screw pump rotor is 0.2 mm.
The invention has the following advantages: the invention provides an oil extraction device with an integrated all-metal screw pump of a machine pump with an external rotor, which is characterized in that the integral length of a unit is reduced through the integrated arrangement of the machine pump to improve the trafficability of a deflecting section of a horizontal well with a medium and short curvature radius, so that the unit is prevented from being blocked due to scaling and incapable of tripping for well workover due to overlong underground service time; meanwhile, the invention can be suitable for the heavy oil thermal recovery working condition by adopting the all-metal screw pump; in addition, the motion conversion mechanism can realize the cooling and lubrication of the motion conversion mechanism while completing the conversion of the rotation of the fixed shaft of the motor rotor into the eccentric rotation of the screw pump rotor relative to the screw pump bushing, thereby greatly prolonging the service life of the motion conversion mechanism.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a sectional view of an oil extraction device with an integrated all-metal screw pump and an external rotor type pump according to the present invention;
FIG. 2 is an enlarged view of the position A in FIG. 1 of the oil extraction device with the rotor external machine-pump integrated all-metal screw pump according to the present invention;
FIG. 3 is a sectional view of the upper part of the motion conversion mechanism of the integrated all-metal screw pump oil production device with the external rotor and the pump of the invention;
FIG. 4 is a cross-sectional view of the lower part of the motion conversion mechanism of the integrated all-metal screw pump oil production device with the external rotor and the pump of the invention;
FIG. 5a is a cross-sectional view of the lower crossover sub of the oil production device of the integrated all-metal screw pump with external rotor and pump according to the present invention;
FIG. 5b is the left side view of the lower conversion joint of the oil extraction device with the rotor external machine and the pump integrated all-metal screw pump in FIG. 5 a;
FIG. 6a is a cross-sectional view of an upper adapter of the oil production device of the integrated all-metal screw pump with the external rotor and the pump according to the present invention;
FIG. 6b is the left side view of the upper conversion joint of the integrated all-metal screw pump oil production device with the external rotor and the pump in FIG. 6 a;
FIG. 7a is a sectional view of the driving shaft of the integrated all-metal screw pump oil extraction device of the external mechanical pump with rotor of the present invention;
FIG. 7b is the left side view of FIG. 7a showing the drive shaft of the integrated all-metal screw pump oil recovery device with the external rotor type pump according to the present invention;
FIG. 8 is a sectional view of the upper filtering component of the integrated all-metal screw pump oil extraction device with the external rotor pump according to the present invention.
In the figure, 1, an upper joint, 2, a shell, 3, a lower joint, 4, a motor rotor, 5, a permanent magnet, 6, a motor stator, 7, a first bearing, 8, a second bearing, 9, a screw pump shell, 10, a screw pump bush, 11, a screw pump rotor, 12, a cable accommodating inclined hole, 13, an insulating sealing washer, 14, a dynamic sealing dynamic ring, 15, a dynamic sealing static ring, 16, a screw pump limiting boss, 17, a screw pump rotor connector, 18, a motion conversion mechanism, 19, a driving sleeve, 20, an angular contact ball bearing, 21, an upper conversion connector, 22, an upper driving shaft seat, 23, an upper filtering part, 231, an upper filtering net, 232, an upper filtering net seat, 24, an upper ball, 25, an upper driving shaft first pressure seat, 26, an upper driving shaft centralizing support, 27, an upper driving shaft second pressure seat, 28, an upper driving shaft pressure sleeve, 29, a driving shaft, 30 and a driving sleeve connector, 31. the filter comprises a lower conversion joint, 32, a lower driving shaft seat, 33, a lower filter part, 34, a lower ball, 35, a first lower pressing seat of a lower driving shaft, 36, a centering support of the lower driving shaft, 37, a second lower pressing seat of the lower driving shaft, 38, a pressing sleeve of the lower driving shaft, 39, a first flow channel, 40, a second flow channel, 41, a containing cavity of a lower filter screen seat, 42, a third flow channel, 43, a fourth flow channel, 44, a lower ball raceway, 45, a containing cavity of the lower driving shaft seat, 46, a containing cavity of an upper filter screen seat, 47, a fifth flow channel, 48, a sixth flow channel, 49, an upper ball raceway, 50, a containing cavity of the upper driving shaft seat, 51, a seventh flow channel, 52 and a ball seat.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The invention is further illustrated with reference to the following figures and examples.
Referring to fig. 1 and 2, an embodiment of the invention provides an oil production device with an integrated all-metal screw pump with an external rotor and a pump, which comprises a shell, an integrated all-metal screw pump with a pump, a dynamic seal and a motion conversion mechanism, wherein the integrated all-metal screw pump is positioned in the shell, the dynamic seal is positioned at the lower end of the integrated all-metal screw pump with the pump, and the motion conversion mechanism is positioned at the lower end of the dynamic seal; meanwhile, the invention can be suitable for the heavy oil thermal recovery working condition by adopting the all-metal screw pump; in addition, the motion conversion mechanism can realize the cooling and lubrication of the motion conversion mechanism while completing the conversion of the rotation of the fixed shaft of the motor rotor into the eccentric rotation of the screw pump rotor relative to the screw pump bushing, thereby greatly prolonging the service life of the motion conversion mechanism.
Further, the casing comprises top connection 1, shell 2, lower clutch 3, and 2 upper ends of shell and 1 threaded connection of top connection, 2 lower extremes of shell and 3 threaded connection of lower clutch.
Further, the machine-pump integrated all-metal screw pump is composed of a motor rotor 4, a permanent magnet 5, a motor stator 6, a first bearing 7, a second bearing 8, a screw pump shell 9, a screw pump bushing 10 and a screw pump rotor 11, wherein the motor rotor 4, the permanent magnet 5, the motor stator 6, the screw pump shell 9, the screw pump bushing 10 and the screw pump rotor 11 are sequentially arranged in the shell from outside to inside along the radial direction, the permanent magnet 5 is fixedly connected with the motor rotor 4, a certain gap is arranged between the motor stator 6 and the permanent magnet 5, the screw pump shell 9 is fixedly connected with the motor stator 6, the screw pump bushing 10 is fixedly connected with the screw pump shell 9, the screw pump rotor 11 is arranged in the screw pump bushing 10, the screw pump shell 9 is fixedly connected with the upper joint 1, the overall length of a machine set is reduced through the machine-pump integrated arrangement, so, thereby avoiding the blocking of the unit due to scaling and the failure of the well trip and workover caused by overlong underground service time; the screw pump rotor 11 and the screw pump bushing 10 are made of metal materials, a certain gap is formed between the screw pump rotor and the screw pump bushing, thick oil thermal recovery is achieved through the all-metal screw pump, and specifically, the gap between the screw pump bushing 10 and the screw pump rotor 11 is 0.2mm when the all-metal screw pump oil recovery device is used for thick oil thermal recovery. Since the screw pump rotor 11 and the screw pump liner 10 are both made of metal materials, a certain gap is provided between the screw pump rotor 11 and the screw pump liner 10 to prevent the screw pump rotor 11 and the screw pump liner 10 from sliding friction. The inner and outer surfaces of the screw pump liner 10 both expand outwardly after thermal loading and the screw pump rotor 11 also expands outwardly after thermal loading. The results of a large number of experimental analyses and field tests show that the clearance value between the screw pump bushing 10 and the screw pump rotor 11 has great influence on the performance of the pump, the small clearance can reduce leakage, but for the working condition with high viscosity, the small clearance has relatively large torque, and the large clearance effectively reduces the torque but is accompanied with large leakage. Therefore, for the working condition of thick oil thermal recovery, the clearance value cannot be too small or too large, the processing, manufacturing and assembling difficulty is very large when the clearance is less than 0.1mm, meanwhile, the friction resistance of the screw pump rotor 11 in the working process is also very large, and the leakage amount is too large when the clearance is more than 0.3mm, so that a good lifting effect cannot be achieved, therefore, the clearance of the invention is preferably 0.2mm, and the good lifting effect can be met under the condition of ensuring that the processing, manufacturing and assembling difficulty is not high. Specifically, the section line types of the screw pump lining 10 and the screw pump rotor 11 are both short-amplitude hypocycloid equidistant types, and the head ratio of the screw pump rotor 11 to the screw pump lining 10 is 1:2 or 2: 3. On the basis of a large number of numerical analysis experiments, the invention finds that the short-amplitude hypocycloid equidistant type is superior to other line types (short-amplitude epicycloid equidistant type, long-amplitude hypocycloid equidistant type and the like) in comprehensive performance. Meanwhile, experiments show that the more the heads are, the smaller the flow area of the screw bushing pair is, and the rotating speed is reduced. Because the rotors and the bushings of the all-metal screw pump are in clearance fit, the all-metal screw pump has the characteristics of large leakage and low volumetric efficiency, but the volumetric efficiency can be improved by improving the rotating speed, so the rotating speed is selected to be higher, namely the number of heads is selected to be less, and therefore the head ratio of the screw pump rotor 11 to the screw pump bushing 10 is 1:2 or 2:3, preferably 1: 2.
Further, the dynamic seal is composed of a dynamic seal dynamic ring 14 and a dynamic seal static ring 15, the upper end of the dynamic seal dynamic ring 14 is in threaded connection with the motor rotor 4, the lower end of the dynamic seal dynamic ring is in threaded connection with the driving sleeve 19, and the dynamic seal static ring 15 is fixedly connected with the screw pump shell 9. In order to improve the sealing effect of the dynamic seal, the dynamic seal dynamic ring 14 and the dynamic seal static ring 15 are rotationally connected through a bow-shaped structure, and a certain gap is arranged in the radial direction of the dynamic seal dynamic ring 14 and the dynamic seal static ring 15 in order to reduce the friction wear and the generated heat between the dynamic seal dynamic ring 14 and the dynamic seal static ring 15. An insulating sealing washer 13 is arranged between the motor parts of the dynamic seal and pump integrated all-metal screw pump, and the insulating sealing washer plays a role in isolating and sealing the upper motor part.
Specifically, the bottom of the static dynamic sealing ring 15 extends inwards along the radial direction to form a screw pump limiting boss 16 for axially positioning and sealing the screw pump bushing 10, a motion conversion mechanism 18 is arranged at the lower end of the screw pump rotor 11, the motion conversion mechanism 18 is used for converting the fixed shaft rotation of the motor rotor 4 into the eccentric rotation of the screw pump rotor 11 relative to the screw pump bushing 10, the lower end of the motion conversion mechanism 18 is in threaded connection with a driving sleeve 19, the upper end of the motion conversion mechanism 18 is in threaded connection with a screw pump rotor connector 17, and two angular contact ball bearings 20 are arranged between the motion conversion mechanism 18 and the lower connector 3 and used for transmitting the axial force borne by the motion conversion mechanism 18 to the shell.
Referring to fig. 1 and 2, in order to improve the flexibility of the rotation of the motor rotor 4, a first bearing 7 and a second bearing 8 are respectively arranged at the upper end and the lower end of the permanent magnet 5, inner rings of the first bearing 7 and the second bearing 8 are in interference connection with the motor stator 6, and outer rings of the first bearing 7 and the second bearing 8 are in interference connection with the motor rotor 4. In order to improve the heat dissipation effect of the inner parts of the shell and avoid the abrasion between the shell and the inner parts of the shell, the invention is provided with the following steps: the outer diameter of the motor rotor 4, the outer diameter of the dynamic seal moving ring 14 and the outer diameter of the driving sleeve 19 are equal and are represented by D, the inner diameter of the lower end of the upper joint 1, the inner diameter of the shell 2 and the inner diameter of the upper end of the lower joint 3 are equal and are represented by D, and D is slightly smaller than D.
Referring to fig. 3, 4, 5a, 5b, 6a, 6b, 7a, and 7b, the motion conversion mechanism 18 includes an upper adapter 21, a driving shaft 29, and a lower adapter 31, the upper end of the driving shaft 29 is connected to the upper adapter 21, the lower end is connected to the lower adapter 31, the upper adapter 21 is connected to the screw pump rotor connector 17 by screw threads, and a plurality of upper filter screen seat accommodating cavities 46 and fifth flow channels 47 are sequentially formed in the radial direction, and the number of the upper filter screen seat accommodating cavities 46 and the number of the fifth flow channels 47 are equal to each other. An upper filter element 23 is arranged in the upper filter screen seat accommodating cavity 46, an upper ball raceway 49, a sixth flow passage 48, an upper drive shaft seat accommodating cavity 50 and a seventh flow passage 51 are sequentially arranged on the upper conversion joint 21 in the axial direction, wherein the number of the sixth flow passage 48 is equal to that of the fifth flow passage 47, eight upper ball raceways 49 are distributed along the radial circumferential array, an upper drive shaft seat 22 is arranged in the upper drive shaft seat accommodating cavity 50, a flow passing through hole is formed in the middle of the upper drive shaft seat 22, and upper balls 24 are arranged in the upper ball raceway 49; the lower adapter 31 is provided with a driving sleeve connector 30 in threaded connection with the driving sleeve 19, the lower adapter 31 is sequentially provided with a plurality of lower filter screen seat accommodating cavities 41 and third flow channels 42 distributed in a circumferential array in the radial direction, and the number of the lower filter screen seat accommodating cavities 41 and the number of the third flow channels 42 are equal to each other. The lower filter screen seat accommodating cavity 41 is internally provided with a lower filter part 33, the lower conversion joint 31 is sequentially provided with a lower ball raceway 44, a fourth runner 43, a lower drive shaft seat accommodating cavity 45 and a first runner 39 in the axial direction, wherein the number of the fourth runner 43 is equal to that of the third runner 42, eight lower ball raceways 44 are distributed along the radial circumferential array, the lower drive shaft seat 32 is arranged in the lower drive shaft seat accommodating cavity 45, the middle part of the lower drive shaft seat 32 is provided with an overflowing through hole, the lower ball raceway 44 is internally provided with a lower ball 34, the lower conversion joint 31 is further provided with a plurality of second runners 40 which are distributed in the circumferential array and communicated with the first runner 39 in the radial direction, for example, the number of the second runners 40 can be 4, 6 or 8, and the even number is selected as far as possible so as to balance the liquid flow pressure. Ball seats 52 for placing upper balls 24 and lower balls 34 are respectively arranged at two ends of the driving shaft 29, an upper driving shaft seat 22, a driving shaft 29, an upper driving shaft first pressing seat 25, an upper driving shaft righting support 26, an upper driving shaft second pressing seat 27 and an upper driving shaft pressing sleeve 28 are arranged in the inner cavity of the upper conversion joint 21 from top to bottom, the upper driving shaft pressing sleeve 28 is in threaded connection with the upper conversion joint 21, the upper end of the upper driving shaft pressing sleeve is axially positioned on the upper driving shaft second pressing seat 27, a lower driving shaft seat 32, the driving shaft 29, a lower driving shaft first pressing seat 35, a lower driving shaft righting support 36, a lower driving shaft second pressing seat 37 and a lower driving shaft pressing sleeve 38 are arranged in the inner cavity of the lower conversion joint 31 from bottom to top, the lower end of the lower driving shaft pressing sleeve 38 is axially positioned on the lower driving shaft second pressing seat 37, and the upper balls 24 and the lower balls 34 radially position, the upper and lower drive axle housings 22, 32 axially position the drive axle 29.
Specifically, the lower filter screen seat accommodating cavity 41 and the third flow channel 42 are communicated and coaxially arranged, the third flow channel 42 is respectively communicated with the fourth flow channel 43 and the lower drive shaft seat accommodating cavity 45, the axes of the fourth flow channel 43, the lower ball raceway 44 and the lower drive shaft seat accommodating cavity 45 are parallel, the upper filter screen seat accommodating cavity 46 and the fifth flow channel 47 are communicated and coaxially arranged, the fifth flow channel 47 is respectively communicated with the sixth flow channel 48 and the upper drive shaft seat accommodating cavity 50, the axes of the sixth flow channel 48, the upper ball raceway 49 and the upper drive shaft seat accommodating cavity 50 are parallel, and the upper drive shaft seat accommodating cavity 50 and the seventh flow channel 51 are communicated and coaxially arranged.
Referring to fig. 8, the upper filter member 23 includes an upper filter screen 231 and an upper filter screen seat 232, and the upper filter screen 231 is detachably mounted on the upper filter screen seat 232 for easy replacement and cleaning; the middle part of the upper filter screen seat 232 is provided with an overflowing through hole for cooling and lubricating crude oil; the upper filter screen 231 is made of a stainless steel wire mesh and is used for filtering crude oil, so that impurities are prevented from entering the drive shaft 29 and causing friction damage. Specifically, the upper ball 24 and the lower ball 34 are made of tungsten carbide YG13, the upper drive shaft centering support 26 and the lower drive shaft centering support 36 are made of fluororubber, and the upper adapter 21, the drive shaft 29, and the lower adapter 31 are made of 42 CrMo.
It should be noted that the upper end of the upper joint 1 of the present invention is provided with a cable accommodating inclined hole 12 for installing an external cable, and the external cable is connected with a power supply to supply power to the motor stator 6.
When the invention is used, the motor stator 6 is connected with an external power supply through a cable, a rotating magnetic field is generated between the motor stator 6 and the permanent magnet 5 and acts on the motor rotor 4 to form magnetoelectric power rotating torque, the motor stator 6 is not moved, the motor rotor 4 rotates and drives the lower conversion joint 31 to fix the shaft through the dynamic sealing movable ring 14 and the driving sleeve 19, then the screw pump rotor 11 is driven to eccentrically rotate in the screw pump bush 10 through the driving shaft 29 and the upper conversion joint 21, the screw pump rotor 11 and the screw pump bush 10 form a screw bush pair, a sealed cavity is formed by mutually meshing the screw pump rotor 11 and the screw pump bush 10, the volume change in the sealed cavity is driven by the rotation of the screw pump rotor 11 to generate pressure difference, the volume in the sealed cavity is increased, the pressure intensity is reduced, crude oil flows into the lower cavity of the oil extraction device through the lower joint 3, the, along with the rotation of the screw pump rotor 11, crude oil passes through the screw bushing pair and then is discharged from the overflowing hole of the upper joint 1. In the process, a part of crude oil flows through the lower filter screen seat accommodating cavity 41, the third flow passage 42 and the fourth flow passage 43 to cool and lubricate the lower conversion joint 31, the lower driving shaft seat 32, the lower ball 34 and the lower ball head part of the driving shaft 29, and the lower filter part 33 effectively prevents impurities in the crude oil from entering and plays a good role in filtering; a part of crude oil flows through the lower driving shaft pressing sleeve 38 and the lower driving shaft second pressing seat 37 to cool and lubricate the driving shaft 29 and the upper part of the lower ball head of the driving shaft 29, so as to achieve the purposes of reducing heat loss and prolonging service life. Meanwhile, a part of crude oil flows through the upper filter screen seat accommodating cavity 46, the fifth flow passage 47 and the sixth flow passage 48 to cool and lubricate the upper adapter 21, the upper drive shaft seat 22, the upper ball 24 and the upper ball head part of the drive shaft 29, and the upper filter part 23 effectively prevents impurities in the crude oil from entering and plays a good role in filtering; a part of crude oil flows through the upper driving shaft pressing sleeve 28 and the upper driving shaft second pressing seat 27 to cool and lubricate the driving shaft 29 and the lower part of the upper ball head of the driving shaft 29, so as to achieve the purposes of reducing heat loss and prolonging service life.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. An integrated all-metal screw pump oil production device with an external rotor for a machine pump comprises a shell, wherein the shell consists of an upper joint, a shell and a lower joint, the upper end of the shell is in threaded connection with the upper joint, and the lower end of the shell is in threaded connection with the lower joint, and the integrated all-metal screw pump oil production device is characterized in that a motor rotor, a permanent magnet, a motor stator, a screw pump shell, a screw pump bushing and a screw pump rotor are sequentially arranged above the inside of the shell from outside to inside, the permanent magnet is fixedly connected with the motor rotor, a certain gap is arranged between the motor stator and the permanent magnet, the screw pump shell is fixedly connected with the motor stator, the screw pump bushing is fixedly connected with the screw pump shell, the screw pump rotor is arranged in the screw pump bushing, the screw pump shell is fixedly connected with the upper joint, the upper joint is provided with a cable containing inclined hole for installing an external cable at the upper end, the lower end of the motor stator is sequentially provided with an insulating sealing washer and a dynamic seal, the dynamic seal comprises a dynamic seal moving ring and a dynamic seal static ring, the upper end of the dynamic seal moving ring is in threaded connection with the motor rotor, the lower end of the dynamic seal moving ring is in threaded connection with the driving sleeve, the dynamic seal static ring is fixedly connected with the screw pump shell, the dynamic seal moving ring is in rotational connection with the dynamic seal static ring through a bow-shaped structure and is provided with a certain gap in the radial direction, the bottom of the dynamic seal static ring extends inwards in the radial direction to form a screw pump limiting boss for axially positioning and sealing the screw pump bush, the lower end of the screw pump rotor is fixedly provided with a screw pump rotor connector, the lower end of the screw pump rotor connector is provided with a motion conversion mechanism, and the motion conversion mechanism is used for converting the The screw pump is characterized in that the core rotates, the lower end of the motion conversion mechanism is in threaded connection with the driving sleeve, the upper end of the motion conversion mechanism is in threaded connection with the screw pump rotor connector, two angular contact ball bearings are arranged between the motion conversion mechanism and the lower connector, and the two angular contact ball bearings are used for transmitting the axial force borne by the motion conversion mechanism to the shell.
2. The oil extraction device with the integrated all-metal screw pump of the external rotor machine pump as claimed in claim 1, wherein a first bearing and a second bearing are respectively arranged at the upper end and the lower end of the permanent magnet, inner rings of the first bearing and the second bearing are in interference connection with a motor stator, and outer rings of the first bearing and the second bearing are in interference connection with a motor rotor.
3. The oil extraction device with the integrated all-metal screw pump of the external rotor pump as claimed in claim 1, wherein the external diameter of the motor rotor, the external diameter of the dynamic seal dynamic ring and the external diameter of the drive sleeve are equal and denoted by D, the internal diameter of the lower end of the upper joint, the internal diameter of the housing and the internal diameter of the upper end of the lower joint are equal and denoted by D, and D is slightly smaller than D.
4. The integrated all-metal screw pump oil production device of the external rotor machine-pump according to claim 1, it is characterized in that the motion conversion mechanism comprises an upper conversion joint, a driving shaft and a lower conversion joint, the upper end of the driving shaft is connected with the upper conversion joint, the lower end of the driving shaft is connected with the lower conversion joint, the upper conversion joint is in threaded connection with the screw pump rotor connector and is sequentially provided with a plurality of upper filter screen seat accommodating cavities and fifth flow passages which are distributed in a circumferential array manner in the radial direction, an upper filtering component is arranged in the upper filter screen seat accommodating cavity, an upper ball roller path, a sixth flow passage, an upper driving shaft seat accommodating cavity and a seventh flow passage are sequentially arranged on the upper adapter in the axial direction, an upper driving shaft seat is arranged in the upper driving shaft seat accommodating cavity, an overflowing through hole is formed in the middle of the upper driving shaft seat, and an upper ball is arranged in the upper ball rolling path. The lower conversion joint is provided with a driving sleeve connector in threaded connection with a driving sleeve, the lower conversion joint is sequentially provided with a plurality of lower filter screen seat accommodating cavities and a plurality of third runners which are distributed in a circumferential array manner in the radial direction, a lower filter part is arranged in each lower filter screen seat accommodating cavity, the lower conversion joint is sequentially provided with a lower ball raceway, a fourth runner, a lower driving shaft seat accommodating cavity and a first runner in the axial direction, a lower driving shaft seat is arranged in each lower driving shaft seat accommodating cavity, an overflowing through hole is formed in the middle of each lower driving shaft seat, a lower ball is arranged in each lower ball raceway, the lower conversion joint is further provided with a plurality of second runners which are distributed in a circumferential array manner and communicated with the first runners in the radial direction, two ends of the driving shaft are respectively provided with a ball seat for placing the upper ball and the lower ball, and an upper driving shaft seat is installed in each upper conversion joint inner cavity from, The upper driving shaft pressing sleeve is in threaded connection with the upper conversion joint, the upper end of the upper driving shaft pressing sleeve is in axial positioning with the upper driving shaft second pressing seat, the inner cavity of the lower conversion joint is provided with a lower driving shaft seat, a driving shaft, a lower driving shaft first pressing seat, a lower driving shaft centering support, a lower driving shaft second pressing seat and a lower driving shaft pressing sleeve from bottom to top, the lower driving shaft pressing sleeve is in threaded connection with the lower conversion joint, the lower end of the lower driving shaft pressing sleeve is in axial positioning with the lower driving shaft second pressing seat, the upper balls and the lower balls are used for radial positioning of the driving shaft, and the upper driving shaft seat and the lower driving shaft seat are used for axial positioning of the driving shaft.
5. The oil extraction device with an integral all-metal screw pump with an external rotor and an integral pump according to claim 1, wherein the lower filter screen seat accommodating cavity is communicated with and coaxially arranged with a third flow passage, the third flow passage is respectively communicated with a fourth flow passage and a lower drive shaft seat accommodating cavity, the axes of the fourth flow passage, the lower ball race and the lower drive shaft seat accommodating cavity are parallel, the upper filter screen seat accommodating cavity is communicated with and coaxially arranged with a fifth flow passage, the fifth flow passage is respectively communicated with a sixth flow passage and an upper drive shaft seat accommodating cavity, the axes of the sixth flow passage, the upper ball race and the upper drive shaft seat accommodating cavity are parallel, and the upper drive shaft seat accommodating cavity is communicated with and coaxially arranged with a seventh flow passage.
6. The oil production device with the integrated all-metal screw pump of the external rotor machine pump as claimed in claim 1, wherein the upper filter element comprises an upper filter screen and an upper filter screen seat, the upper filter screen is detachably mounted on the upper filter screen seat, a through hole for flowing is formed in the middle of the upper filter screen seat, the upper filter screen is made of a stainless steel wire mesh, and the upper filter element and the lower filter element have the same structural shape.
7. The oil extraction device with an integral all-metal screw pump of the external rotor pump according to claim 1, wherein the upper and lower balls are made of tungsten carbide YG13, the upper and lower driving shaft centering supports are made of fluororubber, and the upper, driving and lower adapters are made of 42 CrMo.
8. The integrated all-metal screw pump oil production device of the external rotor machine-pump according to claim 1, wherein the section line types of the screw pump liner and the screw pump rotor are both of a short-amplitude hypocycloid equidistant type, and the head ratio of the screw pump rotor to the screw pump liner is 1:2 or 2: 3.
9. The integrated all-metal screw pump oil production device with the external rotor and the pump according to claim 1, wherein the clearance between the screw pump bushing and the screw pump rotor is 0.2mm when the all-metal screw pump oil production device is used for thick oil thermal production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110427413.8A CN113062858A (en) | 2021-04-21 | 2021-04-21 | Integrated all-metal screw pump oil production device with external rotor and pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110427413.8A CN113062858A (en) | 2021-04-21 | 2021-04-21 | Integrated all-metal screw pump oil production device with external rotor and pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113062858A true CN113062858A (en) | 2021-07-02 |
Family
ID=76567110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110427413.8A Pending CN113062858A (en) | 2021-04-21 | 2021-04-21 | Integrated all-metal screw pump oil production device with external rotor and pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113062858A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113612348A (en) * | 2021-10-08 | 2021-11-05 | 东营市丰润通科技发展有限公司 | Submersible screw pump based on ultra-low speed multi-rotor permanent magnet submersible motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979717A (en) * | 2012-12-18 | 2013-03-20 | 宁波正鼎石油机械设备制造有限公司 | Full-metal high-temperature-resistant screw pump |
| CN204436780U (en) * | 2014-11-25 | 2015-07-01 | 中国石油大学(华东) | A kind of single screw type pollution discharge pump |
| CN205064257U (en) * | 2015-10-16 | 2016-03-02 | 武汉市恒信泰采油设备制造有限公司 | All -metal screw pump and oil production device |
| CN107620703A (en) * | 2017-10-10 | 2018-01-23 | 中国石油天然气股份有限公司 | Pump one latent oil directly-driven screw pump extracting device of oil and method |
-
2021
- 2021-04-21 CN CN202110427413.8A patent/CN113062858A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979717A (en) * | 2012-12-18 | 2013-03-20 | 宁波正鼎石油机械设备制造有限公司 | Full-metal high-temperature-resistant screw pump |
| CN204436780U (en) * | 2014-11-25 | 2015-07-01 | 中国石油大学(华东) | A kind of single screw type pollution discharge pump |
| CN205064257U (en) * | 2015-10-16 | 2016-03-02 | 武汉市恒信泰采油设备制造有限公司 | All -metal screw pump and oil production device |
| CN107620703A (en) * | 2017-10-10 | 2018-01-23 | 中国石油天然气股份有限公司 | Pump one latent oil directly-driven screw pump extracting device of oil and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113612348A (en) * | 2021-10-08 | 2021-11-05 | 东营市丰润通科技发展有限公司 | Submersible screw pump based on ultra-low speed multi-rotor permanent magnet submersible motor |
| CN113612348B (en) * | 2021-10-08 | 2021-12-21 | 东营市丰润通科技发展有限公司 | Submersible screw pump based on ultra-low speed multi-rotor permanent magnet submersible motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7828533B2 (en) | Positive displacement motor/progressive cavity pump | |
| CN110685592B (en) | Non-support speed-reducing turbine drilling tool for petroleum drilling | |
| EP2847477A1 (en) | Mud motor bearing assembly and method | |
| CN113062858A (en) | Integrated all-metal screw pump oil production device with external rotor and pump | |
| US20150004031A1 (en) | Compliant Radial Bearing for Electrical Submersible Pump | |
| CN102734443A (en) | Double spiral axial moving seal driving device | |
| CN207934806U (en) | A kind of petroleum and natural gas exploitation helicoid hydraulic motor reversing shaft of new construction | |
| CN211145241U (en) | Cycloidal pin gear speed reducer with oil dynamic lubrication and cooling | |
| CN203146392U (en) | Rotary shell pump with flow collecting pipe adopting center bearing at two ends | |
| CN113062859A (en) | Rotor built-in type machine-pump integrated all-metal screw pump oil production device | |
| CN206495786U (en) | A kind of low-flow high-lift centrifugal multistage pump multiple centrifugal pump | |
| CN210659909U (en) | Variable speed supporting joint for turbine drilling tool | |
| CN201351633Y (en) | Novel mechanical seating auxiliary circulating pump | |
| CN1080366A (en) | Anticorrosion submerged pump | |
| CN111810049A (en) | Positive displacement fixed-shaft rotary underground power motor | |
| CN214196534U (en) | Magnetic transmission device for underground slurry generator | |
| CN110985389A (en) | Water-based lubricating corrosion-resistant Roots compressor | |
| CN108131097B (en) | Screw drilling tool reversing shaft for petroleum and natural gas exploitation | |
| CN115076107B (en) | Cantilever vertical screw vacuum pump | |
| CN110594366A (en) | Cycloidal pin gear speed reducer with oil dynamic lubrication and cooling | |
| CN103603822A (en) | Rotating casing pump with center bearings adopted at two ends of collecting pipe | |
| CN213392707U (en) | Novel antiseep chemical pump | |
| CN216278514U (en) | Multistage pump supported by sliding bearing | |
| CN218467569U (en) | High-thrust protector for synchronous reluctance submersible motor | |
| CN219918688U (en) | Magnetic coupling driver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210702 |
|
| RJ01 | Rejection of invention patent application after publication |