Single-head screw pump stator inner cavity size measuring system

Abstract

The invention discloses a single-head screw pump stator inner cavity size measuring system. The problem that a complex inner cavity of an existing screw pump stator cannot be accurately detected is mainly solved. The device is characterized in that a guide rail (2) is arranged on the base (1), a movable stator clamping device and a measuring device are respectively arranged on the guide rail (2), and a screw pump stator (20) is fixed on the stator clamping device; the measuring device comprises a measuring seat (9), the measuring seat (9) is connected with a measuring hollow rod (10), the front end of the measuring hollow rod (10) is connected with a rotatable measuring head (6), the measuring head (6) is connected with a sensor (16) and an encoder (11) through cables, and measured data are transmitted and displayed on an electronic display device (13). The single-head screw pump stator inner cavity size measuring system can accurately measure the inner diameter of each axial section of the stator inner cavity, can observe the surface condition of the stator inner cavity, and determines the stator processing and manufacturing precision.

Description

Technical Field

[0001] The invention relates to the technical field of oil production engineering, in particular to a system for measuring the inner cavity size of a stator of a single-head screw pump. Background Art

[0002] There are two main processing methods for the stator of a single-head screw pump for oil production. One is to vulcanize and bond the rubber in a metal jacket with a length of 2-10m, and the other is to assemble and dock the short samples of the screw pump stator that are directly processed in multiple sections. Since the inner cavity of the screw pump stator is a complex concave-convex double spiral surface groove, the inner cavity aperture is both small and long, and its inner cavity molding accuracy or processing accuracy cannot be measured using conventional testing tools. The overall processing accuracy of the stator cavity of the screw pump directly affects the assembly, use effect and life of the stator and rotor of the single-head screw pump. If the deviations of the major diameter, minor diameter and lead of each section of the stator cavity are large, far from the design value or the uniformity of the dimensions of each section is not good, then the rotor and stator will produce linear mismatch and interference in the cooperation, and the rotation will not be smooth, stuck, and friction and wear, resulting in many problems such as large friction load, low work efficiency, and short service life. In serious cases, it is easy to cause stuck failure.

[0003] Since the inner cavity of the screw pump stator is a slender and complex concave-convex double-helical curved groove, conventional methods cannot observe and detect the inner cavity forming accuracy, and the screw pump stator is generally cut to check. At present, processing manufacturers mostly use the empirical comparison method to measure the size of the inner cavity of the screw pump stator. For example, the test rod comparison method is to turn out multiple cylindrical test rods with different tolerances that are close to the stator minor diameter, insert them into the stator inner hole from both ends of the stator inner cavity, and find the cylindrical test rod size closest to the stator inner diameter as the measured value of the stator minor diameter; and its major diameter size is measured by using a caliper to measure the major diameter at both ends of the stator inner cavity and find the average value. This method has large measurement errors and many human factors. The empirical measurement values ​​at both ends of the stator inner cavity are used as the size of each axial section of the stator inner cavity. It cannot truly reflect the size of each axial section of the screw pump stator inner cavity, which is not conducive to product quality evaluation and selection. Summary of the invention

[0004] In order to overcome the problem that the complex inner cavity of the existing screw pump stator cannot be accurately detected, the present invention provides a single-head screw pump stator inner cavity size measurement system, which can accurately measure the inner diameters of each axial section of the stator inner cavity, and can also observe the surface condition of the stator inner cavity to determine the stator processing and manufacturing accuracy.

[0005] The technical solution of the present invention is: a single-head screw pump stator inner cavity size measurement system, comprising a base, a guide rail is provided on the base, a movable stator clamping device and a measuring device are respectively provided on the guide rail, and the stator of the screw pump is fixed on the stator clamping device; The measuring device comprises a measuring seat, a measuring hollow rod is connected to the measuring seat, a rotatable measuring head is connected to the front end of the measuring hollow rod, and the measuring head is connected to a sensor and an encoder through a cable to transmit and display the measuring data on an electronic display device.

[0006] A positioning ruler and a grating ruler are respectively arranged on the guide rails. The positioning ruler is located at the bottom of the stator clamping device, and the grating ruler is located at the bottom of the measuring device.

[0007] The measuring head comprises a rotating body, which is connected to the front end of a measuring hollow rod, the front end of the rotating body is connected to a measuring needle, the measuring needle is connected to a measuring head, and the measuring head is connected to a symmetrically arranged measuring rod; the measuring needle is connected to a sensor.

[0008] The front end of the rotating body is connected to the guide body, and a guide contact is provided on the outer surface of the guide body. The rotating body is located outside the measuring head, and the end of the measuring rod passes through the outer wall of the rotating body.

[0009] The measuring rod includes a long-axis measuring rod and a short-axis measuring rod, and the guide contact includes a long-axis guide contact and a short-axis guide contact; when measuring the long-axis inner cavity in the stator of the screw pump, the long-axis measuring rod is fixed on the measuring head, and the long-axis guide contact is fixed on the guide body; when measuring the short-axis inner cavity in the stator of the screw pump, the short-axis measuring rod is fixed on the measuring head, and the short-axis guide contact is fixed on the guide body.

[0010] The helix angle between the apex of the long axis measuring rod and the apex of the long axis guide contact is the same as the helix angle of the long axis of the screw pump stator, and the helix angle between the apex of the short axis measuring rod and the apex of the short axis guide contact is the same as the helix angle of the short axis of the screw pump stator.

[0011] An endoscope is fixed at the front end of the measuring hollow rod, and the endoscope is connected to the electronic display device through an endoscope cable.

[0012] The stator clamping device comprises a plurality of brackets which are slidably connected to the guide rails, and a clamping seat is fixed on each bracket, through which the stator of the screw pump passes.

[0013] The sensor is connected to the electronic display device via a sensor cable, and the encoder is connected to the electronic display device via an encoder cable.

[0014] A cavity is arranged inside the measuring hollow rod, and the sensor cable and the encoder cable pass through the cavity. The present invention has the following beneficial effects: by adopting the above scheme, the present invention solves the difficult problem that the complex long cavity of the single-head screw pump stator cannot be accurately detected, improves the accuracy and efficiency of ultra-deep spiral aperture measurement, and is beneficial to improving the manufacturing quality of the screw pump stator; the present invention can not only evaluate the overall processing and manufacturing accuracy of the single-head screw pump stator, but also provide reliable technical means for the reasonable matching of the screw pump stator and rotor, which is beneficial to improving the product quality, performance and life of the screw pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 , Figure 3 is a schematic diagram of the measuring head; Figure 4 It is a schematic diagram of the deck; Figure 5 It is a schematic diagram of the measuring seat; Figure 6 It is a cross-sectional view of the screw pump stator, where A is a schematic diagram of the inner cavity of the long axis and B is a schematic diagram of the inner cavity of the short axis.

[0016] In the figure, 1-base, 2-guide rail, 3-bracket, 4-ruler, 5-card holder, 5-1-top cover, 5-2-top cover bushing, 5-3-base, 5-4-base bushing, 5-5-card holder bolt, 6-measuring head, 6-1-guide body, 6-2-measuring rod, 6-3-measuring head, 6-4-measuring needle, 6-5-connecting piece, 6-6-rotating body, 6-7-guide contact, 6-8-spring, 7-endoscope, 8-grating ruler, 9-measuring seat, 9-1-measuring seat bolt, 9-2-bushing, 9-3-housing, 10-measuring hollow rod, 11-encoder, 12-encoder cable, 13-electronic display device, 14-handwheel, 15-leg, 16-sensor, 17-sensor seat, 18-sensor cable, 19-endoscope cable, 20-screw pump stator. Implementation

[0017] The present invention will be further described below in conjunction with the accompanying drawings: Depend on Figures 1 to 6 As shown, a single-head screw pump stator inner cavity dimension measurement system includes a base 1, a guide rail 2 is provided on the base 1, and the bottom of the guide rail 2 is supported by a plurality of legs 15. A movable stator clamping device and a measuring device are provided on the guide rail 2, respectively, and the stator clamping device and the measuring device can move respectively. A positioning scale 4 and a grating scale 8 are provided on the guide rail 2, wherein the positioning scale 4 is located at the bottom of the stator clamping device and is used to measure the moving distance of the stator clamping device; the grating scale 8 is located at the bottom of the measuring device and measures the moving distance of the measuring device in real time.

[0018] The stator clamping device includes a plurality of brackets 3, which are connected to the guide rail 2 and can slide along the guide rail 2. A holder 5 is fixed on each bracket 3, and the screw pump stator 20 passes through the holder 5. The holder 5 is composed of a top cover 5-1, a top cover bushing 5-2, a base 5-3, a base bushing 5-4, and a holder bolt 5-5, wherein the base 5-3 is fixed to the bracket 3, a base bushing 5-4 is provided inside the base 5-3, a top cover bushing 5-2 is provided inside the top cover 5-1, and the base 5-3 is connected to the top cover 5-1 by a holder bolt 5-5 to fix the screw pump stator 20 to be tested. According to the different outer diameters of the screw pump stator 20 to be tested, top cover bushings 5-2 and base bushings 5-4 of different sizes are installed, and the top cover bushings 5-2 and the base bushings 5-4 are made of wear-resistant non-metallic materials. According to the different lengths of the screw pump stator 20 to be tested, the holder 5 and the bracket 3 are evenly distributed on the supporting screw pump stator 20. The holder 5 can slide freely on the guide rail 2 through the connected bracket 3, and can also be fixed at a certain position as required.

[0019] The measuring device includes several measuring seats 9, which are connected to the guide rail 2 through a bracket and can slide freely along the guide rail 2 or be fixed at a certain position as needed. The measuring seat 9 includes a shell 9-3, and a bushing 9-2 is arranged inside the shell 9-3. The bushing is made of self-lubricating material, and the shell and the bushing are fixed by a measuring seat bolt 9-1. A measuring hollow rod 10 is arranged inside the bushing 9-3, and the measuring hollow rod 10 passes through several measuring seats 9 in sequence. A rotatable measuring head 6 is connected to the front end of the measuring hollow rod 10, and the measuring head 6 is connected to the sensor 16, and the sensor 16 is connected to the electronic display device 13 through the sensor cable 18. An encoder 11 is also included, which is fixed on the last measuring seat 9, and the encoder 11 is connected to the electronic display device 13 through the encoder cable 12. The results measured by the measuring head 6 are transmitted and displayed on the electronic display device 13. An endoscope 7 is also fixed to the front end of the measuring hollow rod 10. The endoscope 7 is an industrial endoscope and is connected to the electronic display device 13 through the endoscope cable 19. The electronic display device 13 can record, store, and display the measured long-axis and short-axis data of each section of the stator inner cavity and the inner cavity surface image, and transmit the measured data and images to a host computer, a mobile phone or other display device by wired or wireless means, and generate SPC graphics, or read them through a mobile storage medium. A hand wheel 14 is fixed to the rear end of the measuring hollow rod 10, and the measuring hollow rod 10 is moved forward or backward by turning the hand wheel 14.

[0020] The measuring hollow rod 10 is provided with a cavity inside, and the sensor cable 18 and the endoscope cable 19 pass through the cavity, wherein the sensor cable 18 is located at the center of the cavity, and the endoscope cable 19 is located at the eccentric part of the cavity. The measuring hollow rod 10 can be installed in a single or multiple sections according to the length of the screw pump stator 20 to be measured to meet the measurement requirements.

[0021] The measuring head 6 includes a rotating body 6-6, which is connected to a sensor seat 17, which is connected to the front end of the measuring hollow rod 10, and the sensor 16 is located in the sensor seat 17. When the measuring head is measuring, the rotating body 6-6 rotates, while the sensor 16, the sensor seat 17 and the measuring hollow rod 10 do not need to rotate synchronously. The front end of the rotating body 6-6 is connected to the measuring needle 6-4 through a connecting piece 6-5, and the measuring needle 6-4 is connected to a measuring head 6-3, and the measuring head 6-3 is connected to a symmetrically arranged measuring rod 6-2; the rear end of the measuring needle 6-4 passes through the connecting piece 6-5 and the rotating body 6-6 to contact the sensor 16. When measuring the inner cavity of the screw pump stator, the end of the measuring rod 6-2 contacts the surface of the stator inner cavity, and the measuring needle 6-4 transmits the radial change of the stator inner cavity to the sensor 16. The front end of the rotating body 6-6 is connected to the guide body 6-1, and the rotating body 6-6 is located outside the measuring head 6-3, and the end of the measuring rod 6-2 passes through the outer wall of the rotating body 6-6. A plurality of guide contacts 6-7 are symmetrically connected to the outer surface of the guide body 6-1, and a spring 6-8 is provided between the inner end of the guide contact 6-7 and the guide body 6-1, so that the guide contact 6-7 is elastic in the radial direction and can adapt to the changes in the inner cavity of the screw pump stator. The guide body 6-1 can realize that when the measuring head 6 moves along the helical angle of the screw pump stator 20, the center line of the measuring head 6-3 is in line with the center line of the screw pump stator 20.

[0022] The measuring rod 6-2 includes two specifications: a long-axis measuring rod and a short-axis measuring rod. Similarly, the guide contact 6-7 includes a long-axis guide contact and a short-axis guide contact. When measuring the long-axis inner cavity of the screw pump stator 20, the long-axis measuring rod is fixed on the measuring head 6-3, and the long-axis guide contact is fixed on the guide body 6-1. When measuring the short-axis inner cavity of the screw pump stator 20, the short-axis measuring rod is fixed on the measuring head 6-3, and the short-axis guide contact is fixed on the guide body 6-1. The positions of the above-mentioned measuring rod and guide contact should ensure that: the helix angle between the vertex of the long-axis measuring rod and the vertex of the long-axis guide contact is the same as the helix angle of the long axis of the screw pump stator, and the helix angle between the vertex of the short-axis measuring rod and the vertex of the short-axis guide contact is the same as the helix angle of the short axis of the screw pump stator. Correspondingly, the measuring head 6 is set to two specifications according to the long axis and short axis of the stator inner cavity, and is replaced according to measurement needs.

[0023] The method of using the single-head screw pump stator inner cavity size measurement system is as follows: 1. Place the screw pump stator 20 to be tested in the holder 5 and fix it with the holder bolts 5-5; 2. Start the electronic display device 13, check the system operation, and set the relevant screw pump stator measurement parameters; 3. When measuring the short axis of the screw pump stator 20, the measuring head 6 for measuring the short axis is installed at the front end of the hollow rod 10, and the probe 6-3 is calibrated with a micrometer to ensure that the measured value measured by the probe is accurate after being displayed by the sensor and electronic display device in the measuring system. The specific method is: when a certain dimension needs to be measured, fix the micrometer on this dimension, and then calibrate the probe in the micrometer so that the measured value displayed by the digital display is consistent with the measured value of the micrometer, and the calibration is completed; 4. Hold the hand wheel 14, slowly push the measuring hollow rod 10 to insert the measuring head 6 into the stator inner cavity, and measure the minor axis dimensions and corresponding depths of each axial section of the stator inner cavity; 5. After the measurement of the short axis size of the stator inner cavity is completed, the short axis measuring head for measuring the front end of the hollow rod 10 is replaced with a measuring head for measuring the long axis, and the measuring head 6-3 is calibrated with a micrometer; 6. Hold the handle 14 and slowly push the measuring hollow rod 10 to insert the measuring head 6 into the stator inner cavity, and measure the long axis dimensions of each axial section of the stator inner cavity and the corresponding depth; 7. If necessary, when measuring the major axis or minor axis size of the screw pump stator 20, the endoscope 7 can be used to observe and inspect the surface of the screw pump stator 20, and take photos, videos, 8. Process and analyze the measured inner cavity dimensions of the screw pump stator 20 to complete the measurement.

Claims

1. A system for measuring the inner cavity dimensions of a single-head screw pump stator, comprising a base (1), characterized in that: The base (1) is provided with a guide rail (2), and a movable stator clamping device and a measuring device are respectively provided on the guide rail (2), and a screw pump stator (20) is fixed on the stator clamping device; The measuring device comprises a measuring seat (9), a measuring hollow rod (10) being connected to the measuring seat (9), a rotatable measuring head (6) being connected to the front end of the measuring hollow rod (10), and the measuring head (6) being connected to a sensor (16) and an encoder (11) via a cable, so as to transmit and display the measured data on an electronic display device (13).

2. The single-head screw pump stator inner cavity dimension measurement system according to claim 1, characterized in that: The guide rail (2) is provided with a positioning scale (4) and a grating scale (8), respectively; the positioning scale (4) is located at the bottom of the stator clamping device, and the grating scale (8) is located at the bottom of the measuring device.

3. The single-head screw pump stator inner cavity dimension measurement system according to claim 1, characterized in that: The measuring head (6) comprises a rotating body (6-6), the rotating body (6-6) being connected to the front end of a measuring hollow rod (10), the front end of the rotating body (6-6) being connected to a measuring needle (6-4), the measuring needle (6-4) being connected to a measuring head (6-3), the measuring head (6-3) being connected to a symmetrically arranged measuring rod (6-2); the measuring needle (6-4) being connected to a sensor (16).

4. The single-head screw pump stator inner cavity dimension measurement system according to claim 3, characterized in that: The front end of the rotating body (6-6) is connected to the guide body (6-1), the outer surface of the guide body (6-1) is provided with a guide contact (6-7), the rotating body (6-6) is located outside the measuring head (6-3), and the end of the measuring rod (6-2) passes through the outer wall of the rotating body (6-6).

5. The single-head screw pump stator inner cavity dimension measurement system according to claim 4, characterized in that: The measuring rod (6-2) comprises a long-axis measuring rod and a short-axis measuring rod, and the guide contact (6-7) comprises a long-axis guide contact and a short-axis guide contact; when measuring the long-axis inner cavity in the screw pump stator (20), the long-axis measuring rod is fixed on the measuring head (6-3), and the long-axis guide contact is fixed on the guide body (6-1); when measuring the short-axis inner cavity in the screw pump stator (20), the short-axis measuring rod is fixed on the measuring head (6-3), and the short-axis guide contact is fixed on the guide body (6-1).

6. The single-head screw pump stator inner cavity dimension measurement system according to claim 5, characterized in that: The helix angle between the apex of the long axis measuring rod and the apex of the long axis guide contact is the same as the helix angle of the long axis of the screw pump stator, and the helix angle between the apex of the short axis measuring rod and the apex of the short axis guide contact is the same as the helix angle of the short axis of the screw pump stator.

7. The single-head screw pump stator inner cavity dimension measurement system according to claim 1, characterized in that: An endoscope (7) is fixed to the front end of the measuring hollow rod (10), and the endoscope (7) is connected to the electronic display device (13) via an endoscope cable (19).

8. The single-head screw pump stator inner cavity dimension measurement system according to claim 1, characterized in that: The stator clamping device comprises a plurality of brackets (3), the brackets (3) being slidably connected to the guide rails (2), a holder (5) being fixed to each bracket (3), and the screw pump stator (20) passing through the holder (5).

9. The single-head screw pump stator inner cavity dimension measurement system according to claims 1-8, characterized in that: The sensor (16) is connected to the electronic display device (13) via a sensor cable (18), and the encoder (11) is connected to the electronic display device (13) via an encoder cable (12).

10. The single-head screw pump stator inner cavity dimension measurement system according to claim 9, characterized in that: A cavity is provided inside the measuring hollow rod (10), and the sensor cable (18) and the encoder cable (12) pass through the cavity.

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