A belt pulley set for an oil pumping unit motor

Abstract

The utility model belongs to the field of transmission device for oil production, especially relate to a kind of pumping unit motor pulley set for adjusting the frequency of attack.A kind of pumping unit motor pulley set for adjusting the frequency of attack is presented to reduce cost, including the adapter pulley for being installed on motor shaft and the pulley for being connected on adapter pulley and being used to be directly driven connection with pumping unit through belt, adapter pulley is equipped with the mounting hole for being matched with motor shaft, mounting hole, adapter pulley and pulley are coaxial, and the outer diameter of pulley is less than the outer diameter of adapter pulley.In the utility model, pulley is connected on adapter pulley, and mounting hole matched with motor shaft is not needed to be set on pulley, so the outer diameter of pulley is not limited by the outer diameter of motor shaft, so the outer diameter of pulley can be continuously reduced to reduce the frequency of attack.At the same time, independent speed reducer is not additionally added, which is beneficial to reduce cost, and the transmission chain between motor and pumping unit is short, which can save electricity by 10%~15%.

Description

Technical Field

[0001] This utility model belongs to the field of transmission devices for oil extraction, and in particular relates to a motor pulley assembly for a pumping unit used for adjusting the flow rate. Background Technology

[0002] During routine maintenance of oil pumping units, the operating frequency of the pumping unit needs to be adjusted according to the production status of the oil well. When the oil well supply increases, the pulley of the pumping unit motor needs to be replaced with one with a larger outer diameter to increase the pumping frequency; when the oil well supply decreases, the pulley of the pumping unit motor needs to be replaced with one with a smaller outer diameter to reduce the pumping frequency.

[0003] However, since the pulley is mounted on the motor shaft of the motor, and the pulley has mounting holes that match the motor shaft, the size of the pulley is limited by the outer diameter of the motor shaft. Therefore, when the oil well fluid supply decreases to a certain level, the pulley mounted on the motor shaft is already the smallest pulley (for example, a pulley with an outer diameter of 180 mm). After that, when the oil well fluid supply continues to decrease, it is no longer possible to reduce the stroke by reducing the outer diameter of the pulley. This leads to the phenomenon of "a large horse pulling a small cart", resulting in low efficiency of the pumping unit and wasted energy.

[0004] To address the aforementioned issues, Chinese utility model patent CN217519148U, with an authorization announcement date of September 30, 2022, discloses a novel transmission device for a multi-stroke pumping unit. This transmission device includes a drive shaft and pulleys mounted at both ends of the drive shaft. The pulley at one end of the drive shaft is an output pulley, used for transmission connection to the pumping unit via a belt. The pulley at the other end of the drive shaft is an input pulley, used for transmission connection to a motor pulley via a belt. The output pulley includes a fixed pulley non-removably mounted on the drive shaft and a replaceable pulley detachably mounted on the drive shaft.

[0005] When the motor pulley cannot be reduced further, the ratio of the outer diameter of the input pulley to the outer diameter of the output pulley can be adjusted to further reduce the stroke rate and solve the above problem. Additionally, various stroke rates can be adjusted by replacing pulleys with different outer diameters.

[0006] It should be noted that the replaceable pulley is mounted on the drive shaft. The size of the drive shaft can be different from that of the motor shaft. Therefore, the size of the replaceable pulley is not limited by the outer diameter of the motor shaft, but by the outer diameter of the drive shaft. Thus, the outer diameter of the replaceable pulley can be smaller than the outer diameter of the smallest pulley (e.g., less than 180 mm).

[0007] However, when adjusting the stroke rate using the aforementioned transmission device, it is equivalent to adding a speed reduction device (i.e., the aforementioned transmission device) between the motor and the pumping unit. On the one hand, the cost of adding a speed reduction device (generally 20,000 to 50,000 yuan) is relatively high; on the other hand, the transmission chain between the motor and the pumping unit becomes longer, resulting in reduced energy efficiency and higher energy costs (electricity bills). Utility Model Content

[0008] The purpose of this utility model is to provide a pumping unit motor pulley assembly for adjusting stroke rate, so as to solve the technical problem of high cost caused by using an independent reduction device to reduce stroke rate in the prior art.

[0009] To achieve the above objectives, the technical solution of the pumping unit motor pulley assembly for adjusting the flow rate provided by this utility model is as follows: A motor pulley assembly for a pumping unit with adjustable flow rate includes an adapter wheel for mounting on the motor shaft and a pulley connected to the adapter wheel for direct transmission to the pumping unit via a belt. The adapter wheel has a mounting hole for matching the motor shaft. The mounting hole, the adapter wheel, and the pulley are all coaxial, and the outer diameter of the pulley is smaller than the outer diameter of the adapter wheel.

[0010] Furthermore, the adapter wheel is a large pulley, and the pulley connected to the large pulley is a small pulley. The large pulley is also used to directly drive the pumping unit via a belt, so as to adjust the stroke rate by connecting the belt to the large pulley or the small pulley.

[0011] Furthermore, the pulley is detachably connected to an adapter wheel to adjust the stroke rate by replacing the pulley with one of different outer diameters.

[0012] Furthermore, the adapter wheel has a ring of evenly spaced connecting holes on its axial end face near the pulley. The center of the circumference enclosed by all the connecting holes is located on the axis of the adapter wheel. The pulley includes a connecting flange that matches the connecting holes for detachably connecting the pulley and the adapter wheel with fasteners.

[0013] Furthermore, the connecting hole is a threaded hole for detachably connecting the pulley and the adapter wheel via bolts connected to the threaded hole.

[0014] Furthermore, the outer diameter of the pulley is not less than 120 mm to prevent slippage between the belt and the pulley.

[0015] Furthermore, the outer diameter of the pulley is no greater than 180 mm.

[0016] Furthermore, the outer diameter of the adapter wheel is not less than 180 mm.

[0017] Furthermore, the materials used for the pulleys and adapters are stronger than those used for cast iron.

[0018] Furthermore, the pulley and the adapter wheel are made of bearing steel.

[0019] The beneficial effects of the pumping unit motor pulley assembly for adjusting stroke rate provided by this utility model are as follows: The main difference between this utility model and the prior art is that in the prior art, the pulley is provided with a mounting hole that matches the motor shaft, so the outer diameter of the pulley is limited by the outer diameter of the motor shaft; while in this utility model, the adapter wheel is provided with a mounting hole that matches the motor shaft, and the outer diameter of the adapter wheel is limited by the outer diameter of the motor shaft. However, the pulley is connected to the adapter wheel, and the pulley does not need to be provided with a mounting hole that matches the motor shaft. Therefore, the outer diameter of the pulley is not limited by the outer diameter of the motor shaft, so the outer diameter of the pulley can be further reduced to reduce stroke rate.

[0020] Meanwhile, no additional independent deceleration device is added in this utility model, which helps to reduce costs, and the transmission chain between the motor and the pumping unit is short, which can save 10% to 15% of electricity. Attached Figure Description

[0021] Figure 1 A partial sectional view of the assembly of the motor pulley assembly and motor shaft of the pumping unit used for adjusting the stroke. Figure 2 A schematic diagram of the structure of the pumping unit motor pulley assembly after it is mounted on the motor shaft for adjusting the flow rate; Figure 3 for Figure 1 Left view of the medium-sized belt pulley; Figure 4 for Figure 1 Front view of small and medium-sized pulleys; Figure 5 This is a structural comparison diagram of three different specifications of pulleys.

[0022] Explanation of reference numerals in the attached figures: 1. Large pulley; 1-1. Mounting hole; 1-2. Connecting hole; 2. Small pulley; 2'. Small pulley of the first specification; 2''. Small pulley of the second specification; 2'''. Small pulley of the third specification; 2-1. Connecting flange; 3. Motor shaft; 4. Motor. Detailed Implementation

[0023] To address the problems in the background technology, the core inventive concept of this utility model is: to place the pulley on one side of the motor shaft axis and to connect the pulley and the motor shaft using an adapter wheel. Therefore, there is no need to set a mounting hole on the pulley to match the motor shaft, so that the outer diameter of the pulley is not limited by the outer diameter of the motor shaft, and the number of strokes can be reduced by replacing the pulley.

[0024] The present invention will be further described in detail below with reference to an embodiment of the pumping unit motor pulley assembly for adjusting the flow rate.

[0025] like Figures 1-5 As shown, the motor pulley assembly for the pumping unit used for adjusting the flow rate (hereinafter referred to as the pulley assembly) includes a transfer wheel for mounting on the motor shaft 3 and a small pulley 2 connected to the transfer wheel for direct transmission to the pumping unit via a belt. The transfer wheel is provided with a mounting hole 1-1 for matching the motor shaft 3. The mounting hole 1-1, the transfer wheel and the small pulley 2 are all coaxial, and the outer diameter of the small pulley 2 is smaller than the outer diameter of the transfer wheel.

[0026] In this invention, the adapter wheel is directly connected to the motor shaft 3, and the adapter wheel has a mounting hole 1-1 that matches the motor shaft 3. The outer diameter of the adapter wheel is limited by the outer diameter of the motor shaft. However, the small pulley 2 is not directly connected to the motor shaft 3, but is connected to the adapter wheel. Therefore, the small pulley 2 does not need to have a mounting hole 1-1 that matches the motor shaft 3, and the outer diameter of the small pulley 2 is not limited by the outer diameter of the motor shaft. Thus, the number of strokes can be reduced by replacing the small pulley 2 with one that has a smaller outer diameter.

[0027] In cases where the small pulley 2 and the adapter wheel are detachably connected (e.g., via a flange connection), only the small pulley 2 needs to be replaced; the adapter wheel does not need to be replaced. Figure 5 As shown, the small pulley 2' of the first specification, the small pulley 2'' of the second specification, or the small pulley 2''' of the third specification with different outer diameters can be replaced to adjust to the corresponding stroke. When the small pulley 2 and the adapter wheel are not detachably connected (e.g., integrally cast or welded), the small pulley 2 and the adapter wheel need to be replaced at the same time.

[0028] Preferably, the adapter wheel has a ring of evenly spaced connecting holes 1-2 on its axial end face near the small pulley 2. The center of the circumference enclosed by all the connecting holes 1-2 is located on the axis of the adapter wheel. The small pulley 2 includes a connecting flange 2-1 that matches the connecting holes 1-2 for detachably connecting the small pulley 2 to the adapter wheel using fasteners. The connecting holes 1-2 can be threaded holes for detachably connecting the small pulley 2 to the adapter wheel using bolts connected to the threaded holes.

[0029] Taking a pulley with a minimum outer diameter of 180 mm that can be directly mounted on the motor shaft 3 as an example, the adapter and small pulley 2 will be described in detail below. Of course, the minimum outer diameter of the pulley mounted on the motor shaft 3 will also be different when the motor shaft specifications are different, and those skilled in the art can select according to actual needs.

[0030] The adapter pulley is preferably a large pulley 1 used for direct drive connection between the adapter pulley and the pumping unit via a belt. The outer diameter of the large pulley 1 is not less than 180 mm, and preferably 180 mm. Of course, the outer diameter of the adapter pulley can also be 200 mm, 240 mm, etc. In this case, the main difference between the adapter pulley and the existing pulley is that the adapter pulley is provided with connecting holes 1-2 for engaging with fasteners to connect to the small pulley 2. In this solution, two different strokes can be adjusted by connecting the belt to either the large pulley 1 or the small pulley 2.

[0031] During the process of reducing stroke rate, it is necessary to replace the pulley with one with a smaller outer diameter, for example, replacing the 240 mm outer diameter pulley with a 180 mm outer diameter pulley. At this time, a 180 mm outer diameter adapter can be directly replaced (i.e., large pulley 1; large pulley 1 can be installed alone, or both large pulley 1 and small pulley 2 can be installed simultaneously). The belt is directly connected to large pulley 1. If you want to further reduce stroke rate, the belt can be moved from large pulley 1 to small pulley 2 with a smaller outer diameter. The motor shaft 3 drives small pulley 2 to rotate through large pulley 1, so that small pulley 2 drives the belt. If you want to further reduce stroke rate, you need to replace small pulley 2 with one with a smaller outer diameter and connect the belt to the replaced small pulley 2.

[0032] Similarly, if you want to increase the stroke rate, you can replace the small pulley 2 with one with a larger outer diameter and connect the belt to the replaced small pulley 2. If you want to further increase the stroke rate, you can move the belt from the small pulley 2 to the large pulley 1. If you want to further increase the stroke rate, you need to remove the pulley assembly and replace it with an existing pulley with a larger outer diameter (e.g., an existing pulley with an outer diameter of 240 mm).

[0033] Due to the limitation of the belt wrap angle, to avoid slippage between the belt and the small pulley 2 on rainy days, the outer diameter of the small pulley 2 is preferably not less than 120 mm. Otherwise, the belt tension adjustment method needs to be used to adjust the belt tension to avoid slippage between the small pulley 2 and the belt. Simultaneously, the outer diameter of the small pulley 2 is preferably not greater than 180 mm; otherwise, the existing pulley connected to the motor shaft 3 can be directly replaced, and there is no need to replace the pulley assembly. The outer diameter of the small pulley 2 can be 120 mm, 150 mm, or 180 mm, etc. The belt tension adjustment method is a conventional method in this field, generally achieved by adjusting the distance between the pumping unit reducer and the motor, and will not be elaborated further here. When the outer diameter of the small pulley 2 is 120 mm and the motor 4 is a 12-pole motor 4, the minimum stroke rate can be adjusted to 1.8 r / min.

[0034] Existing pulleys are generally made of cast iron. Because the outer diameter of the small pulley 2 is relatively small (i.e., the small pulley 2 is thinner), the structural strength of the small pulley 2 made of cast iron is relatively low. To improve the structural strength of the small pulley 2, the material used for it can be stronger than cast iron, for example, bearing steel. Of course, the adapter wheel can also be made of a material with greater strength than cast iron, such as bearing steel.

[0035] In existing technologies, adding an independent speed reduction device costs 20,000 to 50,000 yuan and extends the transmission chain between the motor 4 and the pumping unit, resulting in lower energy efficiency. However, in this invention, the large pulley 1 and three... Figure 5 The total price of the small pulley 2 shown is only 3,000 yuan. When purchased in bulk, it can also spread the cost of molds and further reduce the cost of the pulley set. At the same time, the motor shaft 3 is directly connected to the oil pumping unit through the pulley set and belt. The transmission chain is relatively short. After 1.5 years of actual machine testing, it was found that it can save 10-15% of electricity. Moreover, the motor shaft 3 has no obvious damage and can run for a long time.

[0036] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different embodiments to create the embodiments shown in the accompanying drawings. Of course, those skilled in the art can also create other embodiments not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A type of pulley assembly for a pumping unit motor used in adjusting stroke, characterized in that, It includes an adapter wheel for mounting on a motor shaft and a pulley connected to the adapter wheel for direct drive connection with a pumping unit via a belt. The adapter wheel has a mounting hole for matching the motor shaft. The mounting hole, the adapter wheel, and the pulley are all coaxial, and the outer diameter of the pulley is smaller than the outer diameter of the adapter wheel.

2. The pumping unit motor pulley assembly for adjusting the flow rate as described in claim 1, characterized in that, The adapter wheel is a large pulley, and the pulley connected to the large pulley is a small pulley. The large pulley is also used to directly drive the pumping unit via a belt, so as to adjust the stroke rate by connecting the belt to the large pulley or the small pulley.

3. The pumping unit motor pulley assembly for adjusting the flow rate as described in claim 1 or 2, characterized in that, The pulley is detachably connected to the adapter wheel to adjust the stroke rate by replacing the pulley with one of different outer diameters.

4. The pumping unit motor pulley assembly for adjusting the flow rate as described in claim 3, characterized in that, The adapter wheel has a ring of evenly spaced connecting holes on its axial end face near the pulley. The center of the circumference enclosed by all the connecting holes is located on the axis of the adapter wheel. The pulley includes a connecting flange that matches the connecting holes for detachably connecting the pulley and the adapter wheel with fasteners.

5. The pumping unit motor pulley assembly for adjusting the flow rate as described in claim 4, characterized in that, The connection hole is a threaded hole for detachably connecting the pulley and the adapter wheel via bolts connected to the threaded hole.

6. The pumping unit motor pulley assembly for adjusting the flow rate as described in claim 1 or 2, characterized in that, The outer diameter of the pulley is not less than 120 mm to prevent slippage between the belt and the pulley.

7. The pumping unit motor pulley assembly for adjusting the flow rate as described in claim 1 or 2, characterized in that, The outer diameter of the pulley is no greater than 180 mm.

8. The pumping unit motor pulley assembly for adjusting the flow rate as described in claim 1 or 2, characterized in that, The outer diameter of the adapter wheel is not less than 180 mm.

9. The pumping unit motor pulley assembly for adjusting the flow rate as described in claim 1 or 2, characterized in that, The pulleys and adapters are made of materials with greater strength than cast iron.

10. The pumping unit motor pulley assembly for adjusting the flow rate as described in claim 9, characterized in that, The pulley and adapter wheel are made of bearing steel.

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