Coupling speed reducer of double-winding motor gear shifting box assembly for well drilling

Abstract

The utility model discloses a double winding motor gear shifting box assembly coupling reduction gear for well drilling, which comprises at least two double winding motor gear shifting box assemblies and a resultant force reduction box, output shafts of a plurality of double winding motor gear shifting boxes are arranged at a power input end of the resultant force reduction box, and a power output shaft of the resultant force reduction box is used for being connected with a load; output shafts of the double-winding motor gear shifting boxes are uniformly distributed along the circumference of a power output shaft by taking the power output shaft of the resultant force reduction gearbox as a center; standardization of the double-winding motor and the gear shifting box is achieved, the double-winding motor operates in a high-efficiency area, so that the purchase and operation cost is reduced, and spare parts are universal and easy to maintain; the whole device is reasonable in design and compact in structure.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling equipment technology, and in particular to a coupling reduction device for a dual-winding motor shift box assembly for drilling. Background Technology

[0002] Currently, the power units of drilling rigs in China's petroleum industry are divided into diesel engine direct drive, AC variable frequency motor drive, DC motor drive, and grid-connected motor drive. The power source is a diesel generator set, a diesel engine, or grid power. Diesel engine direct drive is difficult to speed adjust and has low cost-effectiveness; DC motor drive or AC asynchronous motor drive both require an SCR or VFD control room, resulting in complex control, difficult maintenance, high energy consumption, and separate motor and control systems, making the entire drive system expensive.

[0003] In particular, the drive methods for winches and mud pumps on domestic oilfield electric drilling rigs mainly include AC variable frequency motor drive, DC motor drive, and grid-connected motor drive. From a developmental perspective, AC variable frequency drilling rigs will become the mainstream equipment. Currently, AC variable frequency drilling rigs generally use high-power, medium-to-low speed electric motors, with a two-speed gearbox to meet the drilling requirements of the winch or mud pump. The disadvantages of this configuration include high purchase and operating costs, large equipment size, inconvenient transportation, high spare parts costs, and difficulty in maintenance. These equipment require technological upgrades and product replacements, increasingly demanding new transmission systems to seek technological advancements and leaps forward. Utility Model Content

[0004] The purpose of this utility model is to provide a coupling reduction device for a dual-winding motor shift box assembly for drilling, which can achieve low purchase cost, high operating efficiency, small size, light weight, standardization of the dual-winding motor shift box assembly, easy maintenance, and convenient transportation.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A coupling reduction device for a drilling dual-winding motor shift box assembly includes at least two dual-winding motor shift box assemblies and a combined reduction gearbox. The output shafts of the multiple dual-winding motor shift boxes are located at the power input end of the combined reduction gearbox, and the power output shaft of the combined reduction gearbox is used to connect the load. The output shafts of the multiple dual-winding motor shift boxes are evenly distributed around the power output shaft of the combined reduction gearbox. The dual-winding motor shift box assembly is composed of a dual-winding motor and a shift box. The output shaft of the dual-winding motor is driven to the input end of the shift box, and the output shaft of the shift box is driven to the combined reduction gearbox. The dual-winding motor and the shift box housing are integrally connected.

[0007] The dual-winding motor is an automotive-grade medium-high speed dual-winding permanent magnet synchronous motor. The output shaft of the dual-winding motor is connected to the input end of the gearbox via a coupling, splined shaft, or shrink sleeve.

[0008] The gearbox has at least two gears, and its output shaft is connected to the reducer via a coupling, splined shaft, or shrink sleeve.

[0009] Compared with the prior art, this utility model has the following advantages:

[0010] 1) Due to the adoption of a dual-winding motor shift box assembly, the dual-winding motor can operate efficiently near its rated speed under both light and high loads; under medium or light loads, by reducing the number of dual-winding motors in operation, the dual-winding motor can always operate in the high-efficiency range.

[0011] 2) Compared with conventional single-winding permanent magnet motors, dual-winding permanent magnet motors can output twice the power of single-winding permanent magnet motors. As a result, the number of input shafts in the gearbox can be reduced by half while transmitting the same power, and the size of the gearbox is greatly reduced. For situations where two gearboxes are originally required to accommodate all single-winding motors, only a single gearbox is needed to meet the same power requirements, simplifying the structure, reducing weight, and lowering costs.

[0012] 3) It adopts a small-power dual-winding motor and a gearbox integrated connection, which is convenient for purchasing and replacement due to large annual output and low cost; it is lightweight, low-cost, conducive to standardization, easy to assemble and install and easy to maintain, which can significantly reduce the procurement cost and maintenance cost of the power unit of the work machine and shorten the maintenance time.

[0013] 4) For different specifications of work machines, different numbers of the same model of double-winding motors and multi-gear boxes are used to match them, which has good versatility. The double-winding motors have low power and low price, which significantly reduces the cost of spare parts. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0015] Figure 2 for Figure 1 The top view shown;

[0016] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0017] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of this utility model;

[0018] Figure 5 This is a schematic diagram of the structure of Embodiment 4 of this utility model;

[0019] Figure 6This is a structural schematic diagram of Embodiment 5 of the present invention. Detailed Implementation

[0020] like Figure 1 and Figure 2 As shown, this utility model includes at least two dual-winding motor shift box assemblies and a combined reduction gearbox 5. The output shafts of multiple dual-winding motors 2 shift boxes 3 are located at the power input end of the combined reduction gearbox 5, and the power output shaft of the combined reduction gearbox 5 is used to connect the load. The output shafts of the multiple dual-winding motors 2 shift boxes 3 are evenly distributed around the power output shaft of the combined reduction gearbox 5.

[0021] The dual-winding motor shift box assembly consists of a small-power dual-winding motor 2 and a shift box 3. The dual-winding motor 2 is integrally connected to the shift box housing. The small-power dual-winding motor 2 is an automotive-grade medium-high speed dual-winding permanent magnet synchronous motor 2. The output shaft of the dual-winding motor 2 is connected to the input end of the shift box 3 through a coupling, spline shaft (hole) or shrink sleeve.

[0022] The aforementioned medium-to-high-speed dual-winding permanent magnet synchronous motor includes a motor housing, a motor shaft, two sets of stator windings, two sets of permanent magnet rotors, and two sets of junction boxes. This motor can output twice the power of a conventional single-winding permanent magnet motor. Both types of motors have the same diameter, but the dual-winding motor is slightly longer than two single-winding motors, and they share a single output shaft. This solution uses multiple medium-to-high-speed, low-power permanent magnet motors as power sources. Compared to using conventional single-winding permanent magnet motors, the dual-winding permanent magnet motor can output twice the power. This allows the number of input shafts in the gearbox to be reduced by half while transmitting the same power, significantly reducing the size of the gearbox. For situations where two gearboxes would normally be needed to accommodate all single-winding motors, only a single gearbox is required to meet the same power requirements, simplifying the structure, reducing weight, and lowering costs.

[0023] The gearbox 3 has a minimum of 2 gears, and the output shaft of the gearbox 3 is connected to the reducer 5 via a coupling, a splined shaft 4 (hole), or a shrink sleeve.

[0024] The combined force reduction gearbox 5 includes at least one stage of transmission mechanism. Each stage of the transmission mechanism includes a coaxially arranged combined force output shaft and at least two combined force input shafts. The combined force input shafts, located in a plane perpendicular to the combined force output shaft, are equally spaced circumferentially around the combined force output shaft, and the combined force input shaft and the combined force output shaft are driven by corresponding gears fixed on their respective shafts. The combined force input shafts are connected to the corresponding power input source. Each stage's combined force input shaft and combined force output shaft are mounted in the combined force reduction gearbox 5 body via bearings, and the final stage combined force output shaft of the combined force reduction gearbox 5 is connected to the load via a coupling 6, a splined shaft, or a shrink sleeve. When the combined force reduction gearbox 5 is a single-stage transmission, each combined force input shaft can be connected to a dual-winding motor 2 shift gearbox assembly at one end, or to a dual-winding motor 2 shift gearbox assembly at each end.

[0025] This utility model uses multiple low-power dual-winding motors 2 as power sources, which are respectively connected to the input shafts of multiple shift boxes 3. The output shafts of the multiple shift boxes 3 are respectively connected to the multiple resultant input shafts of the resultant force reduction gearbox 5. The resultant force output shaft of the resultant force reduction gearbox 5 is connected to the input shaft 1 of the working machine to drive its operation. It can achieve both high-speed output and low-speed high-torque output. The dual-winding motors 2 operate efficiently, drive the working machine and meet the needs of production conditions.

[0026] The torque of the final output shaft of the combined force reduction gearbox 5 is determined by the torque generated by a single dual-winding motor 2, the number of shift gearboxes 3, the speed ratio of the shift gearboxes 3, and the speed ratio of the combined force reduction gearbox 5. For example, if there are n shift gearboxes 3 with a speed ratio of m1, the working torque of each dual-winding motor 2 is T, and the speed ratio of the combined force reduction gearbox 5 is m2, then the torque generated by the output shaft is n × T × m1 × m2. When the shift gearbox 3 performs a shifting operation, i.e., the speed ratio m1 changes, the output torque of the combined force reduction gearbox 5 changes accordingly to adapt to different production conditions.

[0027] The power of a dual-winding motor can be calculated by working backwards from the load power, overall speed ratio, number of gearboxes, etc.

[0028] This utility model employs multiple low-power dual-winding motors 2 input to a gearbox 3, synchronously coupling them to form a high-torque, high-power output structure to replace the high-power, medium-low speed dual-winding motors 2 and large one-speed or two-speed reduction gearboxes in existing drive schemes. For example, the relatively advanced AC variable frequency winch drive device used in traditional 7000m electric drilling rigs requires a rated output torque of approximately 200,000 Nm, and consists of two 800KW medium-low speed AC variable frequency dual-winding motors 2 and two large two-speed reduction gearboxes, weighing approximately 20 tons, resulting in high purchase costs. According to this utility model, the 7000m... The electric drilling rig winch drive unit outputs the same rated torque and speed. It can be composed of six 300KW permanent magnet synchronous double-winding motors 2 shift box assemblies (4 gears) and two combined force reduction gearboxes 5, weighing about 10 tons, which significantly reduces the purchase cost. The whole set of equipment can output high speed under light load, and can also output large torque at low speed. It can also keep the double-winding motors 2 working in the high-efficiency range at all times to meet the requirements of production conditions. Under low load conditions, the number of double-winding motors 2 can be redundant to improve efficiency. When a double-winding motor 2 fails, the power can be reduced.

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] The minimum number of shift boxes 3 for the dual-winding motor 2 of this utility model is 2. The following are examples of the distribution and connection of 2-6 dual-winding motor 2 shift boxes 3.

[0031] Example 1: When there are 4 dual-winding motors 2 and 4 shift boxes 3, such as Figure 1 , Figure 2 As shown, the dual-winding motor 2 and the shift gearbox 3 are distributed on one side of the combined force reduction gearbox 5 and located at four symmetrical corner positions. The final stage combined force output shaft 5-4 of the combined force reduction gearbox 5 is located on the opposite side of the combined force reduction gearbox 5 body. The sun gear 5-2 is installed on the final stage combined force output shaft 5-4 inside the housing 5-1 of the combined force reduction gearbox 5. The primary combined force input shaft has four satellite gears 5-3. After the four shift gearboxes 3 are driven by the four dual-winding motors 2 respectively, they drive the satellite gears 5-3 inside the housing 5-1 to rotate through the combined force input shaft of the combined force reduction gearbox 5, which in turn drives the sun gear 5-2 to rotate, thereby driving the work machine to operate through the final stage combined force output shaft 5-4 of the combined force reduction gearbox 5.

[0032] When the dual-winding motor shift box assembly needs to shift gears:

[0033] When speed adjustment is required, the machine stops, and multiple gearboxes 3 simultaneously perform rapid gear shifts. The shifting method can be pneumatic, electric, or hydraulically driven, and the entire shifting process takes no more than one second. After the gear is shifted and locked, multiple dual-winding motors 2 start synchronously and drive the machine through the gearboxes 3 and the combined force reduction gearbox 5. For example, if the machine is originally working at low speed in gear I and needs to shift to gear IV, the machine stops; gear I is shifted to neutral, then gear IV is entered, locked, and the multiple dual-winding motors 2 are restarted, and the machine starts working at gear IV speed.

[0034] Example 2

[0035] like Figure 3 As shown, the difference between this embodiment and the device described in Embodiment 1 is that there are two shift boxes 3 and two corresponding dual-winding motors 2. The shift boxes of the dual-winding motors 2 are distributed on the left and right sides of the final stage output shaft of the resultant force reduction gearbox 5, and are distributed along the circumference.

[0036] Example 3

[0037] like Figure 4 As shown, the difference between this embodiment and the device described in Embodiment 1 is that there are 3 shift boxes 3 and 3 corresponding dual-winding motors 2. The shift boxes of the dual-winding motors 2 are distributed in an isosceles triangular structure around the final stage resultant output shaft of the resultant reduction gearbox 5.

[0038] Example 4

[0039] like Figure 5 As shown, the difference between this embodiment and the device described in Embodiment 1 is that the number of shift boxes 3 is 5, and the corresponding number of dual-winding motors 2 is 5. The shift boxes of the dual-winding motors 2 are distributed in a star-shaped structure around the final stage output shaft of the resultant force reduction gearbox 5.

[0040] Example 5

[0041] like Figure 6 As shown, the difference between this embodiment and the device described in Embodiment 1 is that the number of shift boxes 3 is 6, and the corresponding number of dual-winding motors 2 is 6. The shift boxes of the dual-winding motors 2 are distributed in a hexagonal structure around the final stage output shaft of the resultant force reduction gearbox 5.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A dual-winding electric machine shift box assembly coupling reduction device for drilling, characterized by: The application relates to a double-winding motor gear box assembly, which comprises at least two double-winding motor gear box assemblies and a resultant reduction gear box, the output shafts of the double-winding motor gear box assemblies are arranged at the power input end of the resultant reduction gear box, and the power output shaft of the resultant reduction gear box is used for connecting a load; the output shafts of the double-winding motor gear box assemblies are uniformly distributed along the circumference of the power output shaft of the resultant reduction gear box; the double-winding motor gear box assembly is composed of a double-winding motor and a gear box, the output shaft of the double-winding motor is transmissionally connected to the input end of the gear box, the output shaft of the gear box is transmissionally connected to the resultant reduction gear box, and the double-winding motor is integrally connected with the gear box shell.

2. The dual-winding electric machine shift-box assembly coupling-reduction device for drilling a wellbore of claim 1, wherein: The double-winding motor is a vehicle-grade high-speed double-winding permanent magnet synchronous motor, and the output shaft of the double-winding motor is connected to the input end of the gear box through a shaft coupling, a spline shaft or an expansion sleeve.

3. The dual-winding electric machine shift-box assembly coupling-reduction device for drilling a wellbore of claim 2, characterized by: The gear box has at least two gears, and the output shaft of the gear box is connected to the resultant reduction gear box through a shaft coupling, a spline shaft or an expansion sleeve.

Images