A new multi-power mud pump driving device for petroleum engineering

Abstract

The present invention discloses a novel multi-power mud pump driving device for petroleum engineering, which comprises a base. Arranged on the base are a pump hydraulic end group and multiple medium and high-speed motors. The telescopic end of the pump hydraulic end group is connected to a crankshaft, and the end of the crankshaft is connected to the output port of a speed reducer through a coupling. The speed reducer is arranged on the side of the base, and the input end of the speed reducer is connected to the multiple medium and high-speed motors. The multiple medium and high-speed motors drive the crankshaft after being decelerated by the speed reducer, and then drive the pump hydraulic end to operate. The multiple medium and high-speed motors are mechanically coupled and decelerated by a planetary speed reducer to drive the mud pump crankshaft, and then drive the hydraulic end to operate. By using multiple medium and high-speed motors to replace traditional medium and low-speed motors and adopting a planetary gear transmission structure, it has a large reduction ratio, a compact structure, a light weight, a low purchase cost, a high operating efficiency, a low transportation cost, and is easy to maintain.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum engineering equipment, and particularly to a novel multi-power mud pump drive device for petroleum engineering. Background Art

[0002] At present, domestic electric-driven mud pumps for petroleum engineering generally use one or two high-power, medium and low-speed motors. After being decelerated by belt pulleys, they drive the input gear shaft of the mud pump, and then inside the mud pump, they are decelerated by the meshing of the input gear shaft with the large gear ring on the crankshaft, and then drive the hydraulic end to realize the operation of the mud pump. The disadvantages of the above configuration are that the electric-driven mud pump is large in size, heavy in weight, high in cost of medium and low-speed motors, low in belt drive efficiency, inconvenient in overall transportation, high in spare part cost, difficult to maintain, and difficult in the manufacturing process of the crankshaft, etc. Summary of the Invention

[0003] The purpose of the present invention is to provide a novel multi-power mud pump drive device for petroleum engineering. Multiple medium and high-speed motors are mechanically coupled and decelerated through a planetary reduction gearbox and then drive the mud pump crankshaft, and then drive the hydraulic end to operate; by using multiple medium and high-speed motors to replace traditional medium and low-speed motors and adopting a planetary gear transmission structure, it has a large reduction ratio, is structurally compact, light in weight, low in purchase cost, high in operating efficiency, low in transportation cost, and easy to maintain.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A novel multi-power mud pump drive device for petroleum engineering, including a base. A pump hydraulic end group and multiple medium and high-speed motors are arranged in sequence on the base. The telescopic end of the pump hydraulic end group is connected to the crankshaft, and the end of the crankshaft is connected to the output port of the reduction gearbox through a coupling. The reduction gearbox is arranged on the side of the base, and the input end of the reduction gearbox is connected to multiple medium and high-speed motors; the multiple medium and high-speed motors drive the crankshaft after being decelerated by the reduction gearbox, and then drive the pump hydraulic end to operate.

[0006] When one reduction gearbox is adopted, the reduction gearbox is arranged on one side of the rear part of the base. At least two medium and high-speed motors are matched and arranged. The multiple medium and high-speed motors are arranged in the rear half of the base, and the output shafts of the multiple medium and high-speed motors are connected to the input end of the reduction gearbox through couplings.

[0007] When two reduction gearboxes are adopted, the two reduction gearboxes are respectively arranged on the left and right sides of the rear part of the base. At least four medium and high-speed motors are matched and arranged. The multiple medium and high-speed motors are arranged in the rear half of the base and are evenly divided into two groups. The output shafts of each group are respectively connected to the input ends of the corresponding reduction gearboxes through couplings.

[0008] The described speed reducer includes a housing. Inside the housing, there are a power input area and a speed reduction output area from bottom to top. In the power input area, there is an input gear shaft group. The power driving end of each input gear shaft in the input gear shaft group extends outside the housing and is connected to the output shaft of a medium-high speed motor through a coupling. The power output wheel of the input gear shaft meshes with the main power input wheel. The input gear shaft group is circumferentially distributed around the main power input wheel. The main power input wheel is connected to the secondary power input wheel through a primary bearing shaft; in the speed reduction output area, there is a main transmission output wheel. The main transmission output wheel meshes with the secondary power input wheel. The main transmission output wheel drives the sun gear through a secondary bearing shaft. The sun gear meshes with a planetary gear assembly and is fixed to the housing through the planetary gear assembly. A crankshaft docking shaft is fixed at the center of the planetary gear assembly. The crankshaft docking shaft extends outside the housing and is docked with the end of the crankshaft through a coupling.

[0009] The described planetary gear assembly includes a planetary gear set, a planetary gear carrier, and an outer gear ring of the planetary gear set. The planetary gear set meshes with the sun gear. The planetary gear carrier covers between the planetary gear sets. The crankshaft docking shaft is arranged at the center position of the end face of the planetary gear carrier. The outer gears of the planetary gear set mesh with the outer gear ring of the planetary gear set. The outer gear ring of the planetary gear set is fixed to the inner wall of the housing.

[0010] The described speed reducer further includes an intermediate transmission area. The intermediate transmission area is arranged between the power input area and the speed reduction output area. In the intermediate transmission area, there is an intermediate bearing shaft and an idle gear. The primary bearing shaft, the intermediate bearing shaft, and the secondary bearing shaft are arranged side by side and parallel from bottom to top. The intermediate bearing shaft is provided with an idle gear. The idle gear meshes with the secondary power input wheel and the main transmission output wheel.

[0011] (Advantageous effects) The present invention has the following advantages:

[0012] 1) The mud pump does not have traditional input gear shafts and a large crankshaft gear ring. The structure of the pump body is greatly simplified, with a small volume and light weight.

[0013] 2) By using multiple medium-high speed and small-power motors, the cost is low, the quality is light, it is easy to maintain, the procurement cost and maintenance cost of the driving device of the workover rig are reduced, and the maintenance time is shortened.

[0014] 3) By adopting planetary gear transmission, the structure is compact, with a small size, light weight, large transmission ratio, high efficiency, balanced transmission, and strong impact resistance.

[0015] 4) The whole set of electric mud pump is small in size and light in weight, does not need to be disassembled and assembled, and is transported by the whole vehicle.

[0016] 5) For mud pumps of different specifications, different numbers of motors of the same model are used for matching, with good versatility, small motor power, low price, and significantly reduced spare parts cost.

[0017] 6) When a certain motor fails, redundancy is achieved while operating at a reduced power (shutting down one unit). Description of the Drawings

[0018] Figure 1 The front view of the first embodiment of the present invention;

[0019] Figure 2 The side view of the first embodiment of the present invention;

[0020] Figure 3 The cross-sectional view of the first embodiment of the present invention;

[0021] Figure 4 The front view of the second embodiment of the present invention;

[0022] Figure 5 The side view of the second embodiment of the present invention;

[0023] Figure 6 The cross-sectional view of the motor distribution of the second embodiment of the present invention;

[0024] Figure 7 The schematic diagram of the second motor distribution of the second embodiment of the present invention.

[0025] Base 1, pump hydraulic end 2, crankshaft 3, multiple medium and high-speed motors 4, reduction gearbox 5, input gear shaft 51, main power input wheel 52, primary bearing rotating shaft 53, secondary power input wheel 54, intermediate bearing rotating shaft 55, idler gear 56, main transmission output wheel 57, secondary bearing rotating shaft 58, sun gear 59, housing 510, crankshaft docking shaft 511, planetary gear set 512, planetary gear carrier 513, outer gear ring of planetary gear set 514. Detailed Embodiment

[0026] As Figure 1 shown, the present invention includes a base 1, multiple medium and high-speed motors 4, a reduction gearbox 5, a crankshaft 3, and a pump hydraulic end 2. The multiple medium and high-speed motors 4, the reduction gearbox 5, the crankshaft 3, and the pump hydraulic end 2 are arranged on the base 1, integrally connected and fixed to the base 1, and the whole is installed as a skid.

[0027] In the present invention, two sets of pump hydraulic ends and multiple medium and high-speed motors 4 are arranged on the base 1. Among them, multiple medium and high-speed motors 4 use small-power medium and high-speed motors 4 (such as rail-level high-speed permanent magnet synchronous motors 4) as the power source, with high efficiency, large annual output, convenient to purchase and replace, and low cost. Thus, it replaces the input shaft, gear pair, and crankshaft gear ring of the existing mud pump, and removes them, simplifying the structural design of the mud pump and greatly reducing the volume and weight of the pump body. This is mainly because although domestic large-power motors are available at present, the total annual demand for each model is only in the thousands. Due to the small production volume, the price is high. When a failure occurs, the parts deployment speed is slow and the maintenance cost is high. On the other hand, the existing mud pump adopts a meshing and decelerating structure of an input gear shaft 51 and a large gear ring on the crankshaft. The crankshaft process is complex and the maintenance difficulty is large. At the same time, the mud pump is large in volume and heavy in weight.

[0028] Secondly, connect the telescopic ends of the two sets of pump hydraulic ends to the crankshaft 3. The crankshaft 3 is equipped with eccentric wheels, and directly drives the pump hydraulic end 2 to work through the telescopic connecting rod; the end of the crankshaft 3 is connected to the output port of the speed reducer 5 through a coupling (the connection structure type can be a coupling, spline shaft or shrink disc connection). The speed reducer 5 is arranged on the side of the base 1, and the input end of the speed reducer 5 is connected to multiple medium and high-speed motors 4; the multiple medium and high-speed motors 4 drive the crankshaft 3 after being decelerated by the speed reducer 5, and then drive the pump hydraulic end 2 to operate.

[0029] When one speed reducer 5 is used, the speed reducer 5 is arranged on one side of the lower part of the base 1, and at least 2 medium and high-speed motors 4 are matched. When 2-5 medium and high-speed motors 4 are provided, each motor is circumferentially distributed along the main power input wheel 52. The multiple medium and high-speed motors 4 are arranged in the rear half of the base 1, and the output shafts of the multiple medium and high-speed motors 4 are connected to the input end of the speed reducer 5 through a coupling (the connection structure type can be a coupling, spline shaft or shrink disc connection).

[0030] When two speed reducers 5 are used, the two speed reducers 5 are respectively arranged on the left and right sides of the rear part of the base 1, and at least 4 medium and high-speed motors 4 are matched. When 2-5 medium and high-speed motors 4 are provided in each group, each motor is circumferentially distributed along the main power input wheel 52. The multiple medium and high-speed motors 4 are evenly divided into two groups, and the output shafts of each group are respectively connected to the input ends of the corresponding speed reducers 5 through a coupling (the connection structure type can be a coupling, spline shaft or shrink disc connection).

[0031] The described speed reducer 5 includes a housing 510. Inside the housing 510, from bottom to top, there are a power input area A, an intermediate transmission area B, and a speed reduction output area C. In the power input area A, there is a set of input gear shafts 51. The power drive end of each input gear shaft 51 in the set of input gear shafts 51 extends outside the housing 510 and is connected to the output shaft of a medium-high speed motor 4 through a coupling. The power output wheel of the input gear shaft 51 meshes with the main power input wheel 52. The set of input gear shafts 51 is circumferentially distributed around the main power input wheel 52 and realizes mechanical coupling transmission through gear meshing. The main power input wheel 52 is connected to the secondary power input wheel 54 through a primary bearing shaft 53.

[0032] The intermediate transmission area B is arranged between the power input area A and the speed reduction output area C. Inside the intermediate transmission area B, there is an intermediate bearing shaft 55 and an idler gear 56. The primary bearing shaft 53, the intermediate bearing shaft 55, and the secondary bearing shaft 58 are arranged side by side and parallel from bottom to top. There is an idler gear 56 on the intermediate bearing shaft 55. The idler gear 56 meshes with the secondary power input wheel 54 and the main transmission output wheel 57.

[0033] In the described speed reduction output area C, there is a main transmission output wheel 57. The main transmission output wheel 57 meshes with the secondary power input wheel 54. The main transmission output wheel 57 drives the sun gear 59 through a secondary bearing shaft 58. The sun gear 59 meshes with a planetary gear assembly and is fixed to the housing 510 through the planetary gear assembly. A crankshaft docking shaft 511 is fixed at the center of the planetary gear assembly. The crankshaft docking shaft 511 extends outside the housing 510 and is docked with the end of the crankshaft 3 through a coupling.

[0034] The described planetary gear assembly includes a planetary gear set 512, a planetary gear carrier 513, and an outer gear ring 514 of the planetary gear set. The planetary gear set 512 meshes with the sun gear 59. The sun gear 59 rotates as the driving gear of the planetary gear set. The planetary gear carrier 513 covers between the planetary gear sets 512. The crankshaft docking shaft 511 is arranged at the center position of the end face of the planetary gear carrier 513. The planetary gear carrier 513 is connected to the mud pump crankshaft 3 as the crankshaft docking shaft 511. The outer gears of the planetary gear set 512 mesh with the outer gear ring 514 of the planetary gear set. The outer gear ring 514 of the planetary gear set is fixed to the inner wall of the housing 510. The outer gear ring 514 of the planetary gear set is used as a component for fixing and supporting the planetary gear set 512.

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0036] The present invention uses multiple small - power medium - speed and high - speed motors 4 as power sources, which are respectively connected to the power drive ends of each input gear shaft 51 in the input gear shaft group 51 of the reduction gearbox 5. The multiple input gear shafts 51 are mechanically coupled through the main power input wheel 52 to achieve the first - stage reduction; the secondary power input wheel 54 drives the main transmission output wheel 57 through gear meshing to achieve the second - stage reduction; the main transmission output wheel 57 and the sun gear 59 rotate, and drive the planet gear carrier 513 to rotate through the planetary gear set 512 and the external gear ring to achieve the third - stage reduction; the planet gear carrier 513 is used as the output shaft to be connected to the mud pump crankshaft, and then drives the hydraulic end 2 of the mud pump to operate. This device can achieve the mechanical coupling drive of multiple medium - speed and high - speed motors 4, and achieve a large reduction ratio to provide the required speed and torque for the mud pump, meeting the working conditions requirements of petroleum engineering.

[0037] Embodiment 1

[0038] As Figure 1 、 Figure 2 and Figure 3 shown, when one reduction gearbox 5 is used in this device, the reduction gearbox 5 is arranged on the right side of the rear part of the base 1. At least 3 medium - speed and high - speed motors 4 are matched and arranged. Each motor is distributed circumferentially along the main power input wheel 52; 3 medium - speed and high - speed motors 4 are arranged in the rear half of the base 1. The output shafts of the 3 medium - speed and high - speed motors 4 are connected to the input end of the reduction gearbox 5 through couplings (the connection structure type can be couplings, spline shafts or shrink fit connections), and the output shafts of the 3 medium - speed and high - speed motors 4 are distributed circumferentially around the main power input wheel 52 and achieve mechanical coupling transmission through gear meshing. Moreover, the intermediate transmission area B is not set in the reduction gearbox 5 of this embodiment. Thus, the overall weight and volume of the reduction gearbox 5 are reduced, the space is compressed, and it becomes more compact.

[0039] First, the 3 medium - speed and high - speed motors 4 are started, and the power is transmitted to each corresponding input gear shaft 51 through the output shaft. The input gear shaft 51 adopts an integrated design, with the gear and the shaft integrally formed, which is convenient for processing and installation. Each input gear shaft 51 then concentrates the dispersed power onto the main power input wheel 52 to complete the first - stage reduction. At the same time, due to the function of the primary bearing shaft 53, on the one hand, the primary bearing shaft 53 is used to bear and support the weight of multiple wheels, and on the other hand, it enables the wheels fixed on it to achieve synchronous operation. Therefore, the synchronous energy transfer between the main power input wheel 52 and the secondary power input wheel 54 is completed. Subsequently, the secondary power input wheel 54 transmits the energy to the main transmission output wheel 57 to complete the second - stage reduction. Similarly, due to the function of the secondary bearing shaft 58, the main transmission output wheel 57 transmits the energy to the sun gear 59, and then the sun gear 59 transmits the energy to the planetary gear set 512 to complete the third - stage reduction. Finally, the planetary gear set 512 transmits the reduced - speed energy to the crankshaft 3 through the crankshaft docking shaft 511, and ultimately drives the pump hydraulic end 2 group.

[0040] Embodiment 2

[0041] As Figure 4 , Figure 5 and Figure 6 shown, when two speed reducers 5 of the present device are adopted, the speed reducers 5 are arranged on the left and right sides of the lower part of the base 1. There are at least 8 medium and high speed motors 4, and every 4 motors are in a group. Each group is correspondingly connected to a speed reducer 5. The 4 medium and high speed motors 4 are distributed in an equilateral square shape; the 8 medium and high speed motors 4 are arranged in the rear half of the base 1. The output shafts of the 4 medium and high speed motors 4 are connected to the input end of a speed reducer 5 through couplings (the connection structure type can be couplings, spline shafts or shrink fit connections), and the output shafts of the 4 medium and high speed motors 4 are circumferentially distributed around the main power input wheel 52. As Figure 6 and Figure 7 shown, the distribution of the motors does not need to be symmetrical, and only needs to meet the installation of the spatial position on the base, and mechanical coupling transmission is realized through gear meshing. Moreover, an intermediate transmission area B is arranged in the speed reducer 5 of this embodiment. Thereby, the overall internal accommodation space of the speed reducer 5 is increased, the space is optimized, and it is convenient to install more motors.

[0042] First, each group of 4 medium and high speed motors 4 starts, and transmits power to each input gear shaft 51 of the correspondingly connected speed reducer 5 through the output shaft. The input gear shaft 51 adopts an integrated design, integrating the gear and the shaft, which is convenient for processing and installation. Each input gear shaft 51 then concentrates the scattered power on the main power input wheel 52 to complete the first deceleration. At the same time, due to the function of the first-stage bearing shaft 53, on the one hand, the first-stage bearing shaft 53 is used to bear and support the weight of multiple wheels, and on the other hand, it enables the wheels fixed thereon to achieve synchronous operation. Therefore, the energy synchronization transmission is completed between the main power input wheel 52 and the secondary power input wheel 54. Subsequently, the secondary power input wheel 54 transmits the energy to the idle gear 56 in the intermediate transmission area B. After the idle gear 56 is meshed and connected to the main transmission output wheel 57, the energy is then transmitted to the main transmission output wheel 57 to complete the second deceleration. Similarly, due to the function of the second-stage bearing shaft 58, the main transmission output wheel 57 transmits the energy to the sun gear 59, and then the sun gear 59 transmits the energy to the planetary gear set 512 to complete the third deceleration. Finally, the planetary gear set 512 transmits the decelerated energy to the crankshaft 3 through the crankshaft docking shaft 511, and finally drives the pump hydraulic end 2 groups.

[0043] In the present invention, multiple small-power, medium-high-speed motors 4 (such as high-speed permanent magnet synchronous motors 4 at the vehicle track level, with high efficiency) are used as the power input source, which is convenient for purchase and replacement with a large annual output and low cost; the input shaft, gear pair, and crankshaft gear ring of the existing mud pump are removed, simplifying the structural design of the mud pump and greatly reducing the volume and weight of the pump body; parallel gears and planetary gears are used for multi-stage transmission, with a large reduction ratio, high transmission efficiency, compact structure, and light weight, which can achieve the drive of the medium-high-speed motor 4 to meet the working conditions of the mud pump; when a certain motor 4 fails, redundancy can be achieved under the condition of reducing power operation (shutting down one unit); the whole mud pump weighs more than 30% less than the existing electric-driven mud pump, has a small volume, and can be transported as a whole by vehicle. The present invention solves the problems that the field has always wanted to solve and has significant economic and social benefits.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-power mud pump drive device for petroleum engineering, characterized in that: It includes a base, on which a pump hydraulic end group and multiple medium and high-speed motors are arranged in a row. The telescopic end of the pump hydraulic end group is connected to the crankshaft, and the end of the crankshaft is connected to the output port of the reduction gearbox through a coupling. The reduction gearbox is arranged on the side of the base, and the input end of the reduction gearbox is connected to multiple medium and high-speed motors; the multiple medium and high-speed motors drive the crankshaft after being decelerated by the reduction gearbox, and then drive the pump hydraulic end group to operate; When there is one reduction gearbox, the reduction gearbox is arranged on one side of the rear part of the base. There are at least 2 medium and high-speed motors provided in a matching manner. The multiple medium and high-speed motors are arranged in the rear half of the base, and the output shafts of the multiple medium and high-speed motors are connected to the input end of the reduction gearbox through couplings; When there are two reduction gearboxes, the two reduction gearboxes are respectively arranged on the left and right sides of the rear part of the base. There are at least 4 medium and high-speed motors provided in a matching manner. The multiple medium and high-speed motors are arranged in the rear half of the base. The multiple medium and high-speed motors are evenly divided into two groups, and the output shaft of each group is connected to the input end of the corresponding reduction gearbox through a coupling respectively; The reduction gearbox includes a box body. Inside the box body, it is set as a power input area and a reduction output area from bottom to top. Inside the power input area, an input gear shaft group is arranged. The power driving end of each input gear shaft in the input gear shaft group extends out of the box body and is connected to the output shaft of a medium and high-speed motor through a coupling. The power output wheel of the input gear shaft meshes with the main power input wheel. The input gear shaft group is distributed around the circumference of the main power input wheel. The main power input wheel is connected to the secondary power input wheel through a primary bearing rotating shaft; inside the reduction output area, a main transmission output wheel is arranged. The main transmission output wheel meshes with the secondary power input wheel. The main transmission output wheel is linked to the sun gear through a secondary bearing rotating shaft. The sun gear meshes with the planetary gear assembly and is fixed to the box body through the planetary gear assembly. A crankshaft docking shaft is fixed at the center of the planetary gear assembly. The crankshaft docking shaft extends out of the box body and is docked with the end of the crankshaft through a coupling.

2. The multi-power mud pump drive device for petroleum engineering according to claim 1, wherein: The planetary gear assembly includes a planetary gear group, a planetary gear carrier and an outer gear ring of the planetary gear group. The planetary gear group meshes with the sun gear. The planetary gear carrier covers between the planetary gear groups. The crankshaft docking shaft is arranged at the center position of the end face of the planetary gear carrier. The outer gears of the planetary gear group mesh with the outer gear ring of the planetary gear group. The outer gear ring of the planetary gear group is fixed to the inner wall of the box body.

3. The multi-power mud pump drive device for petroleum engineering according to claim 2, characterized in that: When there are two reduction gearboxes, the reduction gearbox further includes an intermediate transmission area. The intermediate transmission area is arranged between the power input area and the reduction output area. Inside the intermediate transmission area, an intermediate bearing rotating shaft and an idle gear are arranged. The primary bearing rotating shaft, the intermediate bearing rotating shaft and the secondary bearing rotating shaft are arranged in parallel from bottom to top. The idle gear is arranged on the intermediate bearing rotating shaft. The idle gear meshes with the secondary power input wheel and the main transmission output wheel.

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