A pumping unit stroke adjustment device

Abstract

A pumping unit stroke adjustment device relates to oil extraction equipment technical field, including motor, reduction gearbox and variable speed mechanism, the variable speed mechanism is located between motor and reduction gearbox, variable speed mechanism includes box, input shaft and output shaft, input shaft is provided with driving gear, driving gear can slide relative to input shaft and coaxial rotation with input shaft, output shaft is provided with more than three different diameter driven gear, each driven gear only coaxial rotation with output shaft;Each driven gear is engaged with one intermediate gear, the partition is located between two adjacent intermediate gears, each intermediate gear has an axle and the axle two ends are directly or indirectly connected with the box, the intermediate gear can rotate relative to its axle, the driving gear can be engaged with each intermediate gear during the sliding process on the input shaft, through the meshing transmission of driving gear, intermediate gear and driven gear, realize the transmission of torque from driving shaft to driven shaft.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil production equipment, and in particular relates to a pumping unit stroke adjustment device. Background Technology

[0002] A pumping unit is a machine used for extracting oil, commonly known as a "nodding donkey." It is the most important lifting device in a rod-type pumping system. Based on whether it has a walking beam, it can be divided into walking beam pumping units and beamless pumping units. The stroke rate refers to the number of times the sucker rod moves up and down per minute in the pumping well. Currently, pumping units used in oil fields have a stroke rate of four or more. High-production wells prefer pumping units with high stroke rates because the fluid production is large; if the stroke rate cannot keep up, it's like a small horse pulling a large cart, affecting production. However, if the stroke rate of a pumping unit in a low-production well cannot be reduced, it's like a large horse pulling a small cart, often resulting in dry pumping, thus reducing the efficiency of the pumping unit.

[0003] Currently, there are roughly three ways to adjust the stroke rate of an oil pumping unit: First, replacing the motor pulley with one of different diameters changes the transmission ratio between the motor pulley and the gearbox pulley. This method is cumbersome, time-consuming, and detrimental to production. Second, changing the motor speed using a frequency converter. This method requires a frequency converter, which is expensive and requires professional maintenance and adjustment, resulting in high maintenance costs. Third, installing a speed-changing mechanism between the motor and the gearbox. This method is highly reliable; for example, there is the patent with authorization announcement number CN219316928U, entitled "A Variable Speed ​​Stroke Rate Adjustment Device for an Oil Pumping Unit".

[0004] However, the aforementioned patent only has three transmission ratios, so it can only achieve three-level adjustment of the stroke rate, and cannot achieve adjustment of more stroke rates. Therefore, it cannot meet the requirements for use in oil pumping units. Utility Model Content

[0005] To achieve multi-level stroke adjustment, this utility model provides a pumping unit stroke adjustment device. This utility model can have multiple pairs of gear transmission pairs, which can realize multi-level stroke adjustment.

[0006] The technical solution provided by this utility model is: a pumping unit stroke adjustment device, including a motor, a gearbox, and a speed change mechanism. The speed change mechanism is located between the motor and the gearbox, and includes an input shaft and an output shaft. The input shaft is connected to the motor via a pulley and a belt, and the output shaft is connected to the input shaft of the gearbox via a pulley and a belt. The speed change mechanism also includes a housing, in which the input shaft and output shaft are arranged parallel to each other. A drive gear is provided on the input shaft, which can slide relative to the input shaft and rotate coaxially with it. Three or more shafts with different diameters are provided on the output shaft. Each driven gear can only rotate coaxially relative to the output shaft. Each driven gear is meshed with an intermediate gear. A partition is also fixedly installed inside the housing, with the partition located between two adjacent intermediate gears. Each intermediate gear has an axle, and both ends of the axle are fixedly connected to the partitions on both sides, or both ends of the partition are fixedly connected to the housing and the partition. The intermediate gear can rotate relative to its axle. During the sliding process of the driving gear on the input shaft, it can mesh with each intermediate gear. Through the sequential meshing of the driving gear, intermediate gear, and driven gear, the torque is transmitted from the driving shaft to the driven shaft.

[0007] A further technical solution is as follows: a U-shaped shift fork is provided above the drive gear, the drive gear is located between the shift forks, the shift forks can slide relative to the housing, a screw is provided on the upper part of the housing in the same direction as the input shaft, the shift fork is threadedly connected to the screw, and the rotation of the screw is converted into the movement of the shift fork relative to the housing.

[0008] A further technical solution is: rollers are provided on both sides of the shift fork, and the rollers contact the two sides of the drive gear, thereby converting the sliding friction between the shift fork and the drive gear into rolling friction; the screw is marked with gear position lines, and the position of the shift fork and the drive gear can be determined by the gear position lines.

[0009] A further technical solution is that the diameters of the driven gears are arranged in an arithmetic sequence along the axial direction of the driven shaft.

[0010] A further technical solution is: the driving gear rotates in opposite directions with each intermediate gear, and an iron filings collection groove is provided on the box below the meshing point of the driving gear and each intermediate gear. The iron filings collection groove has a concave opening, and the box corresponding to the iron filings collection groove has a slag discharge pipe.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model has three or more driven gears, and the transmission ratio can be changed more than three times, resulting in more adjustment positions for the pumping unit to meet usage needs. Furthermore, this utility model has only one driving wheel, while the diameters of the driven wheels form an arithmetic sequence, thus the resulting transmission ratio also forms an arithmetic sequence, making the various adjustment positions of this utility model a uniform arithmetic sequence, facilitating selection.

[0013] 2. The process of adjusting the stroke rate of this utility model is entirely realized within the transmission mechanism, without the need to adjust or loosen any belt. This utility model makes shifting gears convenient, quick, and highly efficient.

[0014] 3. This utility model can be installed on existing oil pumping units without changing the structure of existing oil pumping unit parts, making it highly adaptable.

[0015] 4. In this utility model, since the meshing points of the driving gear and each intermediate gear are located on the same straight line, and the driving gear and each intermediate gear are in a counter-rotating relationship, when the driving gear and the intermediate gear rotate in opposite directions, they can bring the iron filings downwards and throw them into the iron filing groove. Since the iron filing groove is constricted, the iron filings will basically not flow out again after entering, and will not damage the gears again. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a top view of the speed change mechanism in this utility model, where the partition and the output shaft are in a bearing-fit relationship.

[0018] Figure 3 yes Figure 2 A view along direction A.

[0019] Figure 4 yes Figure 2 A view along direction B.

[0020] Figure 5 This is a top view of the speed change mechanism in this utility model, where the partition is not connected to the output shaft.

[0021] In the diagram: 1. Electric motor; 2. Speed ​​change mechanism; 3. Gearbox; 4. Belt; 201. Output shaft; 202. Input shaft; 203. Housing; 204. Drive gear; 205. Intermediate gear; 206. Driven gear; 207. Partition plate; 208. Screw; 209. Shift fork; 210. Roller; 211. Sawtooth groove. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] like Figure 1 As shown, this embodiment includes a motor 1, a reduction gearbox 3, and a speed change mechanism 2. The speed change mechanism 2 is located between the motor 1 and the reduction gearbox 3. The speed change mechanism 2 includes an input shaft 202 and an output shaft 201. The input shaft 202 is connected to the motor 1 via a pulley 4 and a belt 4, and the output shaft 201 is connected to the input end of the reduction gearbox 3 via a pulley 4 and a belt 4. The above is a common structure in the prior art and will not be described in detail here.

[0024] The most significant innovation of this embodiment lies in: Figure 2 and 5 As shown, the transmission mechanism 2 also includes a housing 203. The input shaft 202 and output shaft 201 are arranged parallel to each other in the housing 203. A drive gear 204 is provided on the input shaft 202, and the drive gear 204 is connected to the input shaft 202 via a keyway. The drive gear 204 can slide relative to the input shaft 202 and rotate coaxially with the input shaft 202. Four driven gears 206 with diameters arranged in an arithmetic sequence are provided on the output shaft 201. Each driven gear 206 is connected to the output shaft 201 via a key. Limiting mechanisms are provided on both sides of each driven gear 206 on the output shaft 201 to prevent the driven gear 206 from sliding. Therefore, each driven gear 206 can only rotate coaxially with the output shaft 201. Each driven gear 206 is meshed with an intermediate gear 205. Three partitions 207 are also fixedly installed inside the housing 203. Each partition 207 is located between two adjacent intermediate gears 205, and the three partitions 207 are arranged in parallel. Each intermediate gear 205 has an axle, and both ends of the axle are fixedly connected to the two side partitions 207, or both ends of the partitions 207 are fixedly connected to the housing 203 and the partitions 207. The intermediate gear 205 and its axle are coupled through a rotating bearing, so the intermediate gear 205 can rotate relative to its axle. Figure 2 As can be seen from this, the axles of each intermediate gear 205 are independent, and the axles of each intermediate gear 205 are not on the same straight line. However, the leftmost side of each intermediate gear 205 is on the same straight line. During the sliding process of the driving gear 204 on the input shaft 202, it can mesh with each intermediate gear 205 respectively. Through the sequential meshing of the driving gear 204, intermediate gear 205 and driven gear 206, the torque is transmitted from the driving shaft to the driven shaft.

[0025] like Figure 3 As shown, a U-shaped shift fork 209 is provided above the drive gear 204, with the drive gear 204 located between the shift forks 209. The upper end of the shift fork 209 is inserted into the housing 203, allowing the shift fork 209 to slide relative to the housing 203. A screw 208, co-oriented with the input shaft 202, is provided on the upper part of the housing 203. The screw 208 is located above the drive gear 204. The shift fork 209 is threadedly connected to the screw 208, and the rotation of the screw 208 is converted into the movement of the shift fork 209 relative to the housing 203. When the shift fork 209 meshes with different intermediate gears 205, the transmission ratio between the input shaft 202 and the output shaft 201 is different, meaning the stroke rate of the pumping unit is different. This embodiment provides four stroke rates, but this invention is not limited to four stroke rates. This invention allows for more stroke rate adjustment positions in the pumping unit to meet usage needs.

[0026] In this embodiment, the lower ends of the partition 207 are fixedly connected to the housing 203, and the right end of the partition 207 is fixedly connected to the housing 203. The partition 207 and the output shaft 201 are connected via a rotating bearing. In this configuration, the partition 207 provides some support to the output shaft 201. The left end of the partition 207 is suspended. The strength of the partition 207 can be ensured by increasing its thickness to meet usage requirements. The reason for the left end of the partition 207 being suspended is that it should not obstruct the sliding of the drive gear 204. Alternatively, the partition 207 and the output shaft 201 can be in a non-contact relationship.

[0027] Rollers 210 are provided on both sides of the shift fork 209. The rollers 210 contact the two sides of the drive gear 204, thereby converting the sliding friction between the shift fork 209 and the drive gear 204 into rolling friction.

[0028] The screw 208 is marked with gear position lines. The location of the shift fork 209 and the drive gear 204 can be determined by the gear position lines, so that the operator can know the current location and gear position of the drive gear 204.

[0029] Along the axial direction of the driven shaft, the diameter of the driven gear 206 is in an arithmetic sequence, so that the various gears of the adjustable stroke of this utility model are in a uniform arithmetic sequence, which is convenient for selection.

[0030] In this invention, since the meshing points of the driving gear and each intermediate gear 205 are located on the same straight line, and the driving gear 204 and each intermediate gear 205 rotate in opposite directions, a shavings collection groove is provided on the housing 203 below the meshing point of the driving gear 204 and each intermediate gear 205. The shavings collection groove has a concave opening. Therefore, when the driving gear 204 and the intermediate gears 205 rotate in opposite directions, they can bring the shavings downwards and throw them into the shavings groove 211. Figure 4 As shown, since the iron filings groove 211 is constricted, the iron filings will basically not flow out after entering. The box 203 corresponding to the iron filings collection groove is equipped with a slag discharge pipe. The iron filings are periodically discharged from the box 203 through the slag discharge pipe, which will not damage the gears again and greatly improves the service life of each gear in the transmission mechanism 2.

[0031] This invention can be applied to existing oil pumping units. It only requires installing the speed change mechanism 2 between the motor 1 and the gearbox 3. The belt pulley 4 of the motor 1 is connected to the belt pulley 4 of the input shaft 202 of the speed change mechanism 2 via a belt 4, and the belt pulley 4 of the output shaft 201 of the speed change mechanism 2 is connected to the belt pulley 4 at the input end of the gearbox 3 via a belt 4. Therefore, this invention has good adaptability.

Claims

1. A pumping unit stroke adjustment device, comprising a motor (1), a reduction gearbox (3), and a speed change mechanism (2), wherein the speed change mechanism (2) is located between the motor (1) and the reduction gearbox (3), the speed change mechanism (2) comprising an input shaft (202) and an output shaft (201), the input shaft (202) being connected to the motor (1) via a pulley (4) and a belt (4), and the output shaft (201) being connected to the input end of the reduction gearbox (3) via a pulley (4) and a belt (4), characterized in that: The speed change mechanism (2) further includes a housing (203). The input shaft (202) and output shaft (201) are arranged parallel to each other in the housing (203). A drive gear (204) is provided on the input shaft (202). The drive gear (204) can slide relative to the input shaft (202) and rotate coaxially with the input shaft (202). Three or more driven gears (206) with different diameters are provided on the output shaft (201). Each driven gear (206) rotates only coaxially with the output shaft (201). Each driven gear (206) is meshed with an intermediate gear (205). The housing (203) also has a fixed housing. The partition (207) is located between two adjacent intermediate gears (205). Each intermediate gear (205) has a wheel axle and both ends of the wheel axle are fixedly connected to the two side partitions (207) respectively, or both ends of the partition (207) are fixedly connected to the housing (203) and the partition (207) respectively. The intermediate gear (205) can rotate relative to its wheel axle. The driving gear (204) can mesh with each intermediate gear (205) respectively during the sliding process on the input shaft (202). Through the sequential meshing transmission of the driving gear (204), intermediate gear (205) and driven gear (206), the torque is transmitted from the driving shaft to the driven shaft.

2. The pumping unit stroke adjustment device according to claim 1, characterized in that: A U-shaped shift fork (209) is provided above the drive gear (204). The drive gear (204) is located between the shift forks (209). The shift forks (209) can slide relative to the housing (203). A screw (208) in the same direction as the input shaft (202) is provided on the upper part of the housing (203). The shift fork (209) is threadedly connected to the screw (208). The rotation of the screw (208) is converted into the movement of the shift fork (209) relative to the housing (203).

3. The pumping unit stroke adjustment device according to claim 2, characterized in that: Rollers (210) are provided on both sides of the shift fork (209). The rollers (210) contact the two sides of the drive gear (204), thereby converting the sliding friction between the shift fork (209) and the drive gear (204) into rolling friction.

4. The pumping unit stroke adjustment device according to claim 2, characterized in that: The screw (208) is marked with gear position lines, which can be used to determine the location of the shift fork (209) and the drive gear (204).

5. The pumping unit stroke adjustment device according to claim 1, characterized in that: Along the axial direction of the driven shaft, the diameters of the driven gear (206) are in an arithmetic sequence.

6. The pumping unit stroke adjustment device according to claim 1, characterized in that: The drive gear (204) rotates in opposite directions with each intermediate gear (205). A chip collection groove is provided on the box (203) below the meshing point of the drive gear (204) and each intermediate gear (205). The chip collection groove has a concave opening, and the box (203) corresponding to the chip collection groove is equipped with a slag discharge pipe.

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