Abrasive wear test device for detecting sand resistance of stator rubber of screw pump
By designing an abrasive wear test device that simulates sand discharge conditions, the problem that existing devices cannot accurately detect the stator rubber wear of screw pumps is solved. Accurate wear detection in different sand particle environments is achieved, and the detection accuracy and simulation capability are improved.
Patent Information
- Application Number
- CN202410288720.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-14
- Publication Date
- 2025-09-26
AI Technical Summary
The existing rubber wheel abrasive wear test device cannot accurately simulate the rubber wear performance under the actual working conditions of the screw pump, resulting in inaccurate test results of the stator rubber material performance and unable to quantify the abrasive wear performance under simulated sand production conditions.
An abrasive wear test device was designed to detect the sand resistance of the stator rubber of a screw pump. The sand discharge condition was simulated by a loading device and a feeding device. The rotating wheel and motor were used to control different speeds. Combined with test sand of different particle sizes, the abrasive wear of the rubber sample under loading was detected.
It achieves accurate detection of abrasive wear of rubber samples in different sand environments, provides guidance for the selection of stator rubber materials, and improves detection accuracy and the ability to simulate real working conditions.
Smart Images
Figure CN120702896A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of screw pump detection, in particular to an abrasive wear test device for detecting the sand resistance performance of a screw pump stator rubber. Background Art
[0002] The stator rubber of a progressive cavity pump (PCP) is a crucial component of its oil production system, and its performance directly determines its service life. Extensive research has shown that PCP stator rubber primarily suffers from wear and spalling. With the continued development of oilfields, sand production has become a significant factor in determining PCP performance. Currently, there is no device capable of measuring the abrasive wear of PCP stator rubber materials used in downhole applications. Commonly used stator rubber abrasive wear testing methods primarily utilize rubber wheel abrasive wear testing devices, which fail to simulate the rubber wear performance under real-world operating conditions, resulting in inaccurate results. To date, there is no test device or method for measuring stator rubber abrasive wear under sand production conditions that clearly defines physical properties and allows for simple characterization. Quantifying the abrasive wear performance of PCP stator rubber under sand production conditions is crucial for selecting PCP stator rubber materials. Summary of the Invention
[0003] In order to overcome the deficiency that the existing rubber wheel abrasive wear test device cannot simulate the rubber wear performance under the actual working conditions of the screw pump, resulting in inaccurate test results of the performance of the screw pump stator rubber material, the present invention provides an abrasive wear test device for detecting the sand resistance of the screw pump stator rubber. The device can simulate the operation of rubber samples under various sand discharge conditions, thereby detecting the abrasive wear of the rubber sample under loading.
[0004] The technical solution of the present invention is: an abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump, comprising a supporting device, to which a rotating wheel, a loading device and a feeding device are connected, the loading device is connected to a sample fixture, the sample fixture clamps a rubber sample, the rubber sample contacts the outer diameter of the rotating wheel, and the nozzle outlet of the feeding device is aligned with the contact position of the rubber sample and the rotating wheel.
[0005] The supporting device includes a bottom plate, a bracket and a vertical plate are fixed above the bottom plate, the feeding device is fixed on the top of the bracket, and the rotating wheel is located below the feeding device.
[0006] The middle part of the loading device is connected to the bracket through a rotating shaft. One end of the loading device is connected to the sample clamp and the other end is connected to the weight rack. By adding or removing the weights on the weight rack, the rubber sample applies pressure to the rotating wheel.
[0007] The loading device includes a crossbeam, the rotating shaft is located in the middle of the crossbeam, one end of the crossbeam is connected to the sample fixture through a vertical connecting rod, and the other end is connected to the weight rack, and a tie rod is provided between the crossbeam and the connecting rod.
[0008] The rotating shaft and the bracket are connected via a rolling bearing.
[0009] The sample fixture comprises a fixing plate, two pressing plates are connected on the fixing plate via a clamping bolt, and the stator rubber sample is clamped between the two pressing plates.
[0010] The stator rubber sample is a strip sample with a length of 50 mm ± 2 mm, a width of 30 mm ± 2 mm, and a thickness of 2 mm ± 0.2 mm.
[0011] The feeding device comprises a feeding hopper which is fixed on a bracket, a lower end of the feeding hopper is connected to a nozzle through a nozzle pipe, and an outlet of the nozzle is aligned with the contact surface between the sample and the rotating wheel.
[0012] The bottom of the feed hopper is threadedly connected to the feed port riser, and the lower end of the feed port riser is connected to the nozzle. The feed hopper and the feed port riser are both made of 45 steel.
[0013] The nozzle is a plastic hose.
[0014] The nozzle is fixed to the nozzle via a coupling, and the nozzle is a ceramic nozzle.
[0015] The main shaft of the rotating wheel is connected to the motor, and the motor is fixed on the bottom plate through a bracket.
[0016] The rotating wheel is connected to the motor via a coupling.
[0017] The motor is an AC variable frequency motor, which can achieve output at different speeds by controlling the motor's frequency.
[0018] The rotating wheel is a metal roller, and the surface of the metal roller is chrome-plated and then polished.
[0019] The present invention has the following beneficial effects: due to the adoption of the above scheme, the loading device drives the sample clamp to push it toward the rotating wheel with a certain pressure, so that the sample in the clamp contacts the rotating wheel; after the motor is started, it drives the rotating wheel to rotate, and test sand of a certain particle size is added between the sample and the rotating wheel through the feeding device; by adjusting the size of the weight, the operation of the rubber sample under different interferences is simulated, so as to detect the abrasive wear of the rubber sample under loading, and by replacing the test sand of different particle sizes, the abrasive wear of the rubber sample in different sand environments can be detected. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is the main view of the sample fixture; Figure 3 This is the left side view of the sample fixture.
[0021] In the figure, 1-base plate, 2-bracket, 3-rotating wheel, 4-feed hopper, 5-spray pipe, 6-nozzle, 7-vertical plate, 8-motor, 9-sample fixture, 10-loading device, 11-weight, 12-rotating shaft, 9-1-fixed plate, 9-2-pressing sheet, 9-3-stator rubber sample, 9-4-clamping bolt. DETAILED DESCRIPTION
[0022] The present invention will be further described below in conjunction with the accompanying drawings: Depend on Figures 1 to 3 As shown, an abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump includes a supporting device, to which a rotating wheel 3, a loading device 10 and a feeding device are connected. The loading device 10 is connected to a sample fixture 9, which clamps a rubber sample. The rubber sample is a rectangular rubber test piece. The surface of the rubber sample contacts the outer diameter of the rotating wheel 3. The outlet of the nozzle 6 of the feeding device is aligned with the contact position between the rubber sample and the rotating wheel 3, and the sand used for the experiment is sprayed between the sample and the rotating wheel 3.
[0023] The support device includes a base plate 1, a bracket 2 and a vertical plate 7 fixed on the base plate 1, the bracket 2 is composed of two columns, and a crossbeam is provided on the top of the two columns. The vertical plate 7 is located on one side of the bracket 2, and the vertical plate 7 is parallel to the connection between the two columns of the bracket 2.
[0024] The loading device 10 includes a crossbeam, which is connected to a column of the bracket 2 via a rotating shaft 12. The rotating shaft 12 and the bracket 2 are connected by a rolling bearing, allowing the rotating shaft 12 to rotate freely. A vertical connecting rod at one end of the crossbeam is connected to the sample holder 9, and the other end is connected to the weight rack. When the device is in operation, weights 11 are installed on the weight rack. To ensure stability, a tie rod is installed between the crossbeam and the connecting rod. In this way, the loading device 10 forms a lever mechanism. The weights 11 on the weight rack can cause the rubber sample to apply pressure to the surface of the rotating wheel 3. The amount of pressure can be changed by adding or removing the weights.
[0025] The sample fixture 9 includes a fixed plate 9-1, which is fixed to the connecting rod of the loading device 10. The fixed plate 9-1 is connected to two pressing plates 9-2 via a clamping bolt 9-4. Tightening the clamping bolt 9-4 clamps the stator rubber sample 9-3 between the two pressing plates 9-2. The stator rubber sample 9-3 is a strip-shaped specimen with a length of 50 mm ± 2 mm, a width of 30 mm ± 2 mm, and a thickness of 2 mm ± 0.2 mm.
[0026] The feeding device includes a feed hopper 4, which is fixed to the top of the bracket 2. The outlet of the lower end of the feed hopper 4 is connected to the feed inlet riser via a threaded connection. The lower end of the feed inlet riser is connected to a nozzle 5. The feed hopper 4 and the feed inlet riser are both made of 45 steel. The lower end of the nozzle 5 is connected to a nozzle 6, which is fixed to the nozzle 5 and the nozzle 6 by a coupling. The nozzle 5 is a plastic hose, and the position of the nozzle 6 can be easily adjusted so that the outlet of the nozzle 6 is aligned with the contact surface between the sample and the rotating wheel 3. The nozzle 6 is a ceramic nozzle. The sand for the experiment is contained in the feed hopper 4 and sprayed between the sample and the rotating wheel 3 through the nozzle 5 and the nozzle 6.
[0027] The rotating wheel 3 is a metal roller, preferably made of 45-gauge steel, chrome-plated and then polished to a surface roughness of less than 0.6 parts per thousand. The main shaft of the rotating wheel 3 is connected to the motor 8 via a coupling. The motor 8 is an AC variable-frequency motor that achieves different speeds by controlling the motor's frequency. The motor 8 is fixed to the base plate 1 via a bracket.
[0028] The experimental process includes the following steps: (1) By adjusting the size of the weight 11, the sample holder 9 is pushed toward the rotating wheel 3 with a certain pressure, so that the rubber sample in the sample holder 9 contacts the rim of the rotating wheel 3; (2) Start the motor 8, which drives the rotating wheel 3 to rotate, and the abrasive wear test begins; (3) Add test sand to the feed hopper 4. Test sand of a certain particle size is sprayed between the sample and the rotating wheel 3 through the nozzle 5 and the nozzle 6. By adjusting the size of the weight 11, the operation of the rubber sample under different interference conditions is simulated to test the abrasive wear of the rubber sample under loading. By changing the test sand, the abrasive wear of the rubber sample under different sand particle environments is tested.
Claims
1. An abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump, comprising a support device, characterized in that: The supporting device is connected to a rotating wheel (3), a loading device (10) and a feeding device. The loading device (10) is connected to a sample clamp (9). The sample clamp (9) clamps the rubber sample. The rubber sample contacts the outer diameter of the rotating wheel (3). The outlet of the nozzle (6) of the feeding device is aligned with the contact position between the rubber sample and the rotating wheel (3).
2. The abrasive wear test device for detecting the sand resistance of the screw pump stator rubber according to claim 1 is characterized in that: The supporting device comprises a bottom plate (1), a bracket (2) and a vertical plate (7) fixed above the bottom plate (1), the feeding device is fixed on the top of the bracket (2), and the rotating wheel (3) is located below the feeding device.
3. The abrasive wear test device for detecting the sand resistance of the screw pump stator rubber according to claim 2 is characterized in that: The middle portion of the loading device (10) is connected to the bracket (2) via a rotating shaft (12). One end of the loading device (10) is connected to the sample fixture (9), and the other end is connected to the weight rack. By increasing or decreasing the weights (11) on the weight rack, the rubber sample applies pressure to the rotating wheel (3).
4. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 3 is characterized in that: The loading device (10) includes a crossbeam, the rotating shaft (12) is located in the middle of the crossbeam, one end of the crossbeam is connected to the sample fixture (9) through a vertical connecting rod, and the other end is connected to the weight rack, and a tensioning rod is provided between the crossbeam and the connecting rod.
5. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 4, characterized in that: The rotating shaft (12) and the bracket (2) are connected via a rolling bearing.
6. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 5, characterized in that: The sample fixture (9) comprises a fixed plate (9-1), two pressing plates (9-2) are connected to the fixed plate (9-1) via a clamping bolt (9-4), and a stator rubber sample (9-3) is clamped between the two pressing plates (9-2).
7. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 6, characterized in that: The stator rubber sample (9-3) is a strip specimen with a length of 50 mm ± 2 mm, a width of 30 mm ± 2 mm, and a thickness of 2 mm ± 0.2 mm.
8. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 1, characterized in that: The feeding device includes a feeding hopper (4), which is fixed on the bracket (2). The lower end of the feeding hopper (4) is connected to the nozzle (6) through the nozzle (5), and the outlet of the nozzle (6) is aligned with the contact surface between the sample and the rotating wheel (3).
9. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 8, characterized in that: The bottom of the feed hopper (4) is threadedly connected to the feed inlet riser, and the lower end of the feed inlet riser is connected to the nozzle (5). The material of the feed hopper (4) and the feed inlet riser is 45# steel.
10. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 9, characterized in that: The nozzle (5) is a plastic hose.
11. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 10, characterized in that: The nozzle (5) and the nozzle (6) are fixed via a coupling, and the nozzle (6) is a ceramic nozzle.
12. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 1, characterized in that: The main shaft of the rotating wheel (3) is connected to the motor (8), and the motor (8) is fixed on the base plate (1) via a bracket.
13. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 12, characterized in that: The rotating wheel (3) and the motor (8) are connected via a coupling.
14. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 13, characterized in that: The motor (8) is an AC variable frequency motor, which can achieve output at different speeds by controlling the motor's frequency.
15. The abrasive wear test device for detecting the sand resistance of the stator rubber of a screw pump according to claim 14, characterized in that: The rotating wheel (3) is a metal roller, and the surface of the metal roller is chrome-plated and then polished.