Rotor position detection device of submersible linear motor

Abstract

The invention provides a rotor position detection device of a submersible linear motor, which comprises a bottom plate, a stator cylinder, a rotor and a sealing cover, the rotor is concentrically arranged in a slip ring on the inner wall of the stator cylinder, a detection groove is formed in the side wall of the rotor, a scale grating is arranged in the detection groove, and a photoelectric sensor is arranged on the sealing cover and is used for measuring position information of the scale grating. The sealing cover is further provided with an air curtain nozzle, air curtain sealing is formed through the air pump assembly, and impurities are prevented from entering the stator cylinder. The air pump assembly is driven by the rotor, and continuity of the air curtain is ensured. The device further comprises a nozzle for cooling the photoelectric sensor, so that the stability of long-time working in a high-temperature environment is ensured; the air box and the sealing gasket are designed to seal the gap when the rotor stops, and dust is prevented from entering the gap. The cleaning soft brush can automatically clean stains on the surface of the scale grating when the mover moves at high frequency, so that the measurement precision is ensured. The device is compact in structure, comprehensive in function and suitable for the complex underground environment.

Description

Technical Field

[0001] This invention relates to the field of submersible linear motor technology, and more specifically, to a mover position detection device for a submersible linear motor. Background Technology

[0002] Submersible linear motors, as important downhole drive equipment, are widely used in oil extraction and other fields. Accurate detection of the mover position is crucial for the motor's performance and stability. Photoelectric sensors and scale gratings are widely used due to their high resolution and strong anti-interference capabilities. Photoelectric sensors integrate a light source and a photodetector; the light source emits light that illuminates the scale grating, and the photodetector receives the reflected light, thus detecting the specific position information.

[0003] However, existing submersible linear motor mover position detection devices suffer from several problems, such as poor sealing, which allows dust and impurities to enter the motor, affecting its lifespan and performance; overheating of the photoelectric sensor in high-temperature environments, leading to decreased detection accuracy; and the accumulation of dirt on the scale grating surface, affecting the measurement performance of the photoelectric sensor. These issues limit the application effectiveness and service life of submersible linear motors in complex downhole environments. Therefore, developing an efficient and reliable submersible linear motor mover position detection device is of significant practical importance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a mover position detection device for a submersible linear motor.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: a mover position detection device for a submersible linear motor, comprising a base plate, a stator cylinder on the base plate, multiple sets of windings inside the stator cylinder, a cap at the end of the stator cylinder, a slip ring on the inner wall of the stator cylinder, a mover concentrically arranged in the slip ring, a detection groove and a sliding groove symmetrically arranged on the side wall of the mover, the slip ring and the sliding groove forming a sliding fit, multiple sets of permanent magnets uniformly arranged along the axial direction on the mover, and a protective shell for protecting the permanent magnets between the sides of the detection groove and the sliding groove; a scale grating is provided in the groove of the detection groove, and an inspection hole is provided on the cap. A photoelectric sensor is installed at the inspection hole of the cover. The photoelectric sensor passes through the inspection hole to measure the scale grating. The end plate of the cover has a through hole for the mover, detection groove and slide groove to pass through. A sealing strip is installed on the side wall of the through hole. There is a gap between the side wall of the through hole and the groove of the detection groove for the scale grating to pass through. The cover has an insertion hole. The stator cylinder has an air pump assembly. The air pump assembly supplies air to the first interface of the four-way connector. The third interface of the four-way connector is connected to the inlet of the connecting pipe. The connecting pipe is located in the insertion hole and extends into the interior of the cover. An air curtain nozzle is connected to the outlet of the connecting pipe. The outlet of the air curtain nozzle faces the gap.

[0006] As a preferred embodiment of the present invention, the air pump assembly includes an air cylinder vertically mounted on a base plate, a piston slidably mounted in the air cylinder, a telescopic rod mounted on the piston, the telescopic rod extending to the outside of the air cylinder, and a connecting rod connected to the end of the telescopic rod, the connecting rod being connected to a mover, two air holes being provided at both ends of the air cylinder, and one-way valve one and one-way valve two being respectively connected to the two air holes at each end of the air cylinder, the two one-way valves two being respectively connected to the two inlets of a three-way pipe, and the outlet of the three-way pipe being connected to the first interface of a four-way connector.

[0007] As a preferred embodiment of the present invention, the second interface of the four-way connector is connected to the inlet of the second connecting pipe, the second connecting pipe is fixed on the cover by the first support plate, and the outlet of the second connecting pipe is connected to a heat dissipation nozzle, the outlet of the heat dissipation nozzle facing the photoelectric sensor.

[0008] As a preferred embodiment of the present invention, the fourth interface of the four-way connector is connected to the inlet of the connecting pipe three. The connecting pipe three is fixedly mounted on the end plate of the cover by the support plate two. The support plate two is connected to the air nozzle of the air box. A sliding rod is slidably mounted in the air box. One end of the sliding rod located inside the air box is connected to a pneumatic inclined plate. The pneumatic inclined plate is slidably mounted inside the air box. The side of the pneumatic inclined plate near the air nozzle is inclined away from the sliding rod. A push rod is mounted on the pneumatic inclined plate. The push rod extends to the outside of the air box. A spring one is sleeved on the outside of the push rod. The two sides of the spring one are respectively connected to the air box and the pneumatic inclined plate.

[0009] As a preferred embodiment of the present invention, a plug is connected to one end of the slide rod located outside the air box, and a sealing gasket for sealing the gap is fitted over the outside of the plug.

[0010] As a preferred embodiment of the present invention, a damping ring is provided on the outer side wall of the air box to dampen the push rod.

[0011] As a preferred embodiment of the present invention, the end plate of the cover is provided with a sliding plate, a sliding shaft is slidably provided on the sliding plate along the vertical direction of the scale grating, a cleaning plate is provided at one end of the sliding shaft near the detection groove, a second spring is sleeved on the outside of the sliding shaft, the two ends of the second spring are respectively connected to the sliding plate and the cleaning plate, and a cleaning soft brush for cleaning the scale grating is provided on the side of the cleaning plate facing the detection groove.

[0012] As a preferred technical solution of the present invention, a rotating seat is vertically provided on the slide plate, the rotating seat is connected to the middle part of the lever, a sliding groove is provided on the end of the lever near the sliding shaft, a sliding head is provided on the end of the sliding shaft away from the detection groove, the sliding head and the sliding groove on the lever form a sliding fit, and the end of the lever away from the sliding shaft is driven by the push rod.

[0013] The beneficial effects of this invention compared with the prior art are: (1) This invention forms an air curtain seal through the air pump assembly and air curtain nozzle, effectively preventing dust and impurities from entering the stator cylinder, protecting the internal components of the motor, and extending the service life of the motor; (2) The air pump assembly of this invention blows air to the photoelectric sensor through the heat dissipation nozzle to cool it down, ensuring that the photoelectric sensor can work stably for a long time in a high-temperature environment, improving detection accuracy and equipment reliability; (3) When the mover stops moving, the sealing gasket automatically seals the gap to prevent dust from entering, protecting the internal environment of the motor, reducing maintenance costs, and at the same time, the mover moves... When the sealing gasket automatically separates from the gap, it ensures that the scale grating passes smoothly through the gap and avoids the scale grating being scratched; (4) When the mover moves at high frequency, the cleaning soft brush automatically inserts into the detection slot to remove the stains on the surface of the scale grating. At the same time, the air pressure blown out by the air curtain nozzle increases, which is beneficial to remove the stains on the scale grating, ensuring the measurement accuracy of the photoelectric sensor and improving the detection reliability; (5) The damping ring on the outer side wall of the air box of the present invention plays a damping role on the push rod, avoiding the air pressure fluctuation of the air pump assembly from causing severe friction of the sealing gasket, reducing the wear of the sealing gasket, and improving the sealing effect and service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the cross-section of the present invention.

[0016] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0017] Figure 4 This is a schematic diagram of the structure for installing the permanent magnet of the present invention.

[0018] Figure 5 This is a schematic diagram of the mounting structure of the scale grating of the present invention.

[0019] Figure 6 This is a schematic diagram of the structure of the cap of the present invention.

[0020] Figure 7 This is a schematic diagram of the structure of the moving part and the detection groove passing through the cover of the present invention.

[0021] Figure 8 This is a schematic diagram of the air pump assembly of the present invention.

[0022] Figure 9 This is a schematic diagram of the structure of the connecting pipe of the present invention.

[0023] Figure 10 for Figure 9 A magnified view of a section at point B in the middle.

[0024] Figure 11This is a schematic diagram of the structure of the air curtain nozzle of the present invention.

[0025] Figure 12 This is a schematic diagram of the structure of the heat dissipation nozzle of the present invention.

[0026] Figure 13 This is a schematic diagram of the air box installation structure of the present invention.

[0027] Figure 14 This is a schematic diagram of the internal structure of the gas box of the present invention.

[0028] Figure 15 This is a schematic diagram of the structure for installing the cleaning brush of the present invention.

[0029] Figure 16 for Figure 15 A magnified view of a section at point C.

[0030] Figure 17 for Figure 1 A magnified view of a section at point D.

[0031] Reference numerals: 1-Base plate; 2-Stator cylinder; 3-Cap; 301-Inspection hole; 302-Through hole; 303-Insertion hole; 4-Slip ring; 5-Motor; 6-Detection groove; 7-Slide groove; 8-Permanent magnet; 9-Shell; 10-Scale grating; 11-Photoelectric sensor; 12-Sealing strip; 13-Gap; 14-Air pump assembly; 1401-Air cylinder; 1402-Piston; 1403-Telescopic rod; 1404-One-way valve one; 1405-One-way valve two; 1406-Tee pipe; 15-Four-way connector 16-Connecting pipe one; 17-Air curtain nozzle; 18-Connecting rod; 19-Connecting pipe two; 20-Support plate one; 21-Cooling nozzle; 22-Connecting pipe three; 23-Support plate two; 24-Air box; 2401-Air nozzle; 25-Slide rod; 26-Pneumatic inclined plate; 27-Push rod; 28-Spring one; 29-Plug; 30-Sealing gasket; 31-Damping ring; 32-Slide plate; 33-Slide shaft; 34-Cleaning plate; 35-Spring two; 36-Cleaning soft brush; 37-Rotating seat; 38-Lever; 39-Sliding head. Detailed Implementation

[0032] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0033] Example: Please refer to Figures 1-17The present invention provides the following technical solution: a mover position detection device for a submersible linear motor, comprising a base plate 1, a stator cylinder 2 on the base plate 1, multiple sets of windings inside the stator cylinder 2, a cap 3 fixed to the end of the stator cylinder 2 by bolts, a slip ring 4 on the inner wall of the stator cylinder 2, a mover 5 concentrically arranged in the slip ring 4, a detection groove 6 and a sliding groove 7 symmetrically arranged on the side wall of the mover 5, the slip ring 4 and the sliding groove 7 forming a sliding fit, multiple sets of permanent magnets 8 uniformly arranged along the axial direction on the mover 5, and a protective shell 9 for protecting the permanent magnets 8 between the sides of the detection groove 6 and the sliding groove 7.

[0034] Specifically, alternating current is applied to the winding inside the stator cylinder 2 to generate a magnetic field. The magnetic field interacts with the permanent magnet 8 on the mover 5, causing the mover 5 to move linearly along the axis of the stator cylinder 2. The slide groove 7 slides on the slip ring 4 to ensure that the linear movement of the mover 5 is smooth.

[0035] The detection groove 6 is equipped with a scale grating 10. The cover 3 is equipped with an inspection hole 301. A photoelectric sensor 11 is installed at the inspection hole 301 of the cover 3. The photoelectric sensor 11 passes through the inspection hole 301 to measure the scale grating 10. The end plate of the cover 3 is equipped with a through hole 302 for the mover 5, the detection groove 6 and the slide 7 to pass through. A sealing strip 12 is provided on the side wall of the through hole 302. There is a gap 13 between the side wall of the through hole 302 and the groove of the detection groove 6 for the scale grating 10 to pass through, so as to prevent the scale grating 10 from being scratched when it moves linearly with the mover 5.

[0036] Specifically, when the mover 5 is moving linearly, the scale grating 10 and the detection groove 6 move synchronously with the mover 5. The photoelectric sensor 11 detects the position information of the detection groove 6, thus detecting the position of the mover 5. The sealing strip 12 acts as a seal, ensuring that the through hole 302 is tightly sealed with the mover 5, the detection groove 6, and the slide groove 7, preventing dust from entering the interior of the stator cylinder 2. When the mover 5, carrying the detection groove 6 and the scale grating 10, passes through the through hole 302, the scale grating 10 passes through the gap 13, so the scale grating 10 will not contact the inside of the through hole 302, avoiding scratches to the scale grating 10.

[0037] To prevent dust from entering the stator cylinder 2 through the gap 13, an insertion hole 303 is provided on the cover 3. An air pump assembly 14 is provided on the stator cylinder 2. The air pump assembly 14 supplies air to the first interface of the four-way connector 15. The third interface of the four-way connector 15 is connected to the inlet of the connecting pipe 16. The connecting pipe 16 is located in the insertion hole 303 and extends into the interior of the cover 3. An air curtain nozzle 17 is connected to the outlet of the connecting pipe 16, and the outlet of the air curtain nozzle 17 faces the gap 13.

[0038] Specifically, when the mover 5 is making linear motion, the air pump assembly 14 starts synchronously. The gas from the air pump assembly 14 is delivered to the connecting pipe 16 and the air curtain nozzle 17 through the third interface of the four-way connector 15. The outlet of the air curtain nozzle 17 blows air towards the gap 13 to form an air curtain seal, preventing debris from entering the interior of the stator cylinder 2.

[0039] The air pump assembly 14 includes an air cylinder 1401 vertically mounted on the base plate 1. A piston 1402 is slidably mounted in the air cylinder 1401. A telescopic rod 1403 is mounted on the piston 1402. The telescopic rod 1403 extends to the outside of the air cylinder 1401, and a connecting rod 18 is connected to the end of the telescopic rod 1403. The connecting rod 18 is connected to the mover 5. Two air holes are provided at both ends of the air cylinder 1401. One-way valve 1404 and one-way valve 1405 are respectively connected to the two air holes at each end of the air cylinder 1401. The two one-way valves 1405 are respectively connected to the two inlets of the three-way pipe 1406. The outlet of the three-way pipe 1406 is connected to the first interface of the four-way connector 15.

[0040] Among them, the one-way valve 1404 only allows gas to enter the interior of the air cylinder 1401 from the outside. A filter screen is provided at the inlet of the one-way valve 1404. The filter screen of the one-way valve 1404 prevents dust from entering the interior of the air cylinder 1401. The one-way valve 2 1405 only allows gas to be discharged from the interior of the air cylinder 1401 to the outside.

[0041] Specifically, when the actuator 5 moves linearly, it transmits power through the connecting rod 18, driving the telescopic rod 1403 and the piston 1402 to move linearly synchronously. When the piston 1402 moves away from the base plate 1, the one-way valve 1404 near the base plate 1 inputs gas into the air cylinder 1401, while the one-way valve 1404 away from the base plate 1 prevents gas from flowing out of the air cylinder 1401. At the same time, the piston 1402 forces the gas in the air cylinder 1401 into the three-way pipe 1406 through the one-way valve 1405 away from the base plate 1. The one-way valve 1405 near the base plate 1 prevents gas from flowing back into the air cylinder 1401 through the three-way pipe 1406, so the gas in the three-way pipe 1406 is delivered to the first port of the four-way connector 15. When the piston 1402 moves towards the base plate 1, the same principle applies, and the gas in the three-way pipe 1406 is also delivered to the first port of the four-way connector 15. Therefore, when the moving part 5 moves, the air pump assembly 14 starts synchronously and continuously delivers gas to the first port of the four-way connector 15.

[0042] Considering the complex downhole environment and the need for the submersible linear motor to operate for extended periods in high-temperature conditions, it is necessary to cool down the photoelectric sensor 11 in a timely manner. The second interface of the four-way connector 15 is connected to the inlet of the connecting pipe 2 19. The connecting pipe 2 19 is fixed to the cover 3 by the support plate 1 20. The outlet of the connecting pipe 2 19 is connected to a heat dissipation nozzle 21, and the outlet of the heat dissipation nozzle 21 faces the photoelectric sensor 11.

[0043] Specifically, the gas from the air pump assembly 14 is delivered to the connecting pipe 19 through the second interface of the four-way connector 15, and then blows air to the photoelectric sensor 11 to cool it down through the outlet of the heat dissipation nozzle 21.

[0044] Considering that when the mover 5 stops moving, the base plate 1 no longer forms an air curtain seal, the fourth interface of the four-way connector 15 is connected to the inlet of the connecting pipe 22. The connecting pipe 22 is fixed on the end plate of the cover 3 by the support plate 23. The connecting pipe 22 is connected to the air nozzle 2401 of the air box 24. A sliding rod 25 is slidably provided in the air box 24. One end of the sliding rod 25 located inside the air box 24 is connected to a pneumatic inclined plate 26. The pneumatic inclined plate 26 is slidably provided inside the air box 24. The side of the pneumatic inclined plate 26 near the air nozzle 2401 is inclined away from the sliding rod 25. A push rod 27 is provided on the pneumatic inclined plate 26. The push rod 27 extends to the outside of the air box 24. A spring 28 is sleeved on the outside of the push rod 27. The two sides of the spring 28 are connected to the air box 24 and the pneumatic inclined plate 26, respectively.

[0045] The end of the slide bar 25 located outside the air box 24 is connected to a plug 29, and the plug 29 is covered with a sealing gasket 30 for sealing the gap 13.

[0046] Specifically, when the mover 5 stops moving, the spring 28 provides elastic force, causing the pneumatic inclined plate 26 and the slide rod 25 to press towards the gap 13. When the scale grating 10 is not in the gap 13, the sealing gasket 30 coincides with the three surfaces inside the groove of the scale grating 10, and the sealing gasket 30 is in close contact with the side near the end plate of the cover 3. That is, the sealing gasket 30 seals the gap 13, preventing dust and impurities from entering the stator cylinder 2. When the scale grating 10 is in the gap 13, the sealing gasket 30 contacts the scale grating 10. Based on the same principle, the sealing gasket 30 also seals the gap 13, preventing dust and impurities from entering the stator cylinder 2. When the moving part 5 moves in a straight line, the gas from the air pump assembly 14 is delivered to the connecting pipe 22 through the fourth port of the four-way connector 15. The connecting pipe 22 blows air into the air nozzle 2401. The gas acts on the inclined surface of the slide rod 25 near the plug 29, driving the slide rod 25 to move away from the gap 13. The spring 28 is compressed, the sealing gasket 30 is separated from the gap 13, and the gap 13 is exposed again so that the scale grating 10 can pass through smoothly.

[0047] When the mover 5 reverses direction, the air pump assembly 14 will generate air pressure fluctuations. A damping ring 31 is provided on the outer side wall of the air box 24 to dampen the push rod 27. This prevents the pneumatic inclined plate 26 from reciprocating violently due to the air pressure fluctuations of the air pump assembly 14, thereby preventing the sealing gasket 30 from rubbing violently on the end plate of the cover 3, which would lead to increased wear of the sealing gasket 30 and affect the sealing effect.

[0048] Considering the harsh underground environment, stains on the surface of the scale grating 10 may affect the measurement effect of the photoelectric sensor 11. A sliding plate 32 is provided on the end plate of the cover 3. A sliding shaft 33 is slidably provided on the sliding plate 32 along the vertical direction of the scale grating 10. A cleaning plate 34 is provided at one end of the sliding shaft 33 near the detection groove 6. A second spring 35 is sleeved on the outside of the sliding shaft 33. The two ends of the second spring 35 are respectively connected to the sliding plate 32 and the cleaning plate 34. A cleaning soft brush 36 for cleaning the scale grating 10 is provided on the side of the cleaning plate 34 facing the detection groove 6.

[0049] A rotating seat 37 is vertically provided on the slide plate 32. The rotating seat 37 is connected to the middle part of the lever 38. A sliding groove is provided at one end of the lever 38 near the sliding shaft 33. A sliding head 39 is provided at the end of the sliding shaft 33 away from the detection groove 6. The sliding head 39 and the sliding groove on the lever 38 form a sliding fit. The end of the lever 38 away from the sliding shaft 33 is driven by the push rod 27.

[0050] Specifically, when the mover 5 is not moving linearly at its highest frequency, the push rod 27 and the lever 38 are not in contact, meaning the cleaning plate 34 and the cleaning brush 36 are positioned away from the detection slot 6. Therefore, the cleaning brush 36 will not contact the scale grating 10, preventing the cleaning brush 36 from constantly contacting the scale grating 10. When the mover 5 is moving linearly at its highest frequency, the high-frequency movement of the piston 1402 of the air pump assembly 14 generates strong air pressure, increasing the air pressure blown out by the air curtain nozzle 17, which is beneficial for removing stains from the scale grating 10. At the same time, the air pressure blown out by the air nozzle 2401 increases, and the pneumatic inclined plate 26 and push rod 27 continue to move towards the lever 38. The push rod 27 contacts the end of the lever 38 away from the sliding shaft 33, that is, the push rod 27 drives the lever 38 to rotate. Therefore, the slide head 39 and the sliding shaft 33 move towards the detection groove 6, the spring 2 35 is stretched, and the cleaning soft brush 36 is inserted into the detection groove 6 and contacts the scale grating 10. The scale grating 10 reciprocates with the mover 5, and the cleaning soft brush 36 can remove the stains on the surface of the scale grating 10.

[0051] Working principle: When this device is not in operation, that is, when the mover 5 is stationary, the spring 28 provides elastic force, causing the pneumatic inclined plate 26 and the slide rod 25 to press towards the gap 13. When the scale grating 10 is not in the gap 13, the sealing gasket 30 coincides with the three surfaces inside the groove of the scale grating 10, and the sealing gasket 30 is in close contact with the side near the end plate of the cover 3. That is, the sealing gasket 30 seals the gap 13, preventing dust and impurities from entering the stator cylinder 2. When the scale grating 10 is in the gap 13, the sealing gasket 30 contacts the scale grating 10. Under the same principle, the sealing gasket 30 also seals the gap 13, preventing dust and impurities from entering the stator cylinder 2.

[0052] Alternating current is applied to the windings inside the stator cylinder 2, generating a magnetic field. This magnetic field interacts with the permanent magnet 8 on the mover 5, causing the mover 5 to move linearly along the axial direction of the stator cylinder 2. The slide groove 7 slides on the slip ring 4, ensuring smooth linear movement of the mover 5. The air pump assembly 14 starts synchronously with the movement of the mover 5. The air from the air pump assembly 14 is delivered to the connecting pipe 22 through the fourth port of the four-way connector 15. The connecting pipe 22 blows air into the air nozzle 2401. The air acts on the inclined surface of the slide rod 25 near the plug 29, driving the slide rod 25 to move away from the gap 13. The spring 28 is compressed, and the sealing gasket 30 disengages from the gap 13, exposing the gap 13 so that the scale grating 10 can pass through smoothly.

[0053] The scale grating 10 and the detection groove 6 move synchronously with the mover 5. The photoelectric sensor 11 detects the position information of the detection groove 6, thus detecting the position of the mover 5. The sealing strip 12 acts as a seal, ensuring that the through hole 302 is tightly sealed with the mover 5, the detection groove 6, and the slide groove 7, preventing dust from entering the interior of the stator cylinder 2. When the mover 5, carrying the detection groove 6 and the scale grating 10, passes through the through hole 302, the scale grating 10 passes through the gap 13, so the scale grating 10 will not contact the inside of the through hole 302, avoiding scratches to the scale grating 10. The gas from the air pump assembly 14 is delivered to the air curtain nozzle 17 through the third interface of the four-way connector 15. The outlet of the air curtain nozzle 17 blows air towards the gap 13 to form an air curtain seal, preventing debris from entering the interior of the stator cylinder 2.

[0054] The gas from the air pump assembly 14 is delivered to the connecting pipe 19 through the second interface of the four-way connector 15, and then blows air to the photoelectric sensor 11 through the outlet of the heat dissipation nozzle 21 to cool it down, so that the detection position of the photoelectric sensor 11 is accurate when the submersible linear motor works for a long time in a warm environment.

[0055] When the mover 5 reverses direction, the air pump assembly 14 will generate air pressure fluctuations. A damping ring 31 is provided on the outer side wall of the air box 24 to dampen the push rod 27. This prevents the pneumatic inclined plate 26 from reciprocating violently due to the air pressure fluctuations of the air pump assembly 14, thereby preventing the sealing gasket 30 from rubbing violently on the end plate of the cover 3, which would lead to increased wear of the sealing gasket 30 and affect the sealing effect.

[0056] The underground environment is harsh, and stains on the surface of the scale grating 10 can affect the measurement effect of the photoelectric sensor 11. When it is necessary to clean the stains on the surface of the scale grating 10, the mover 5 is made to move linearly at the highest frequency. The high-frequency movement of the piston 1402 of the air pump assembly 14 generates strong air pressure, which increases the air pressure blown out by the air curtain nozzle 17, which is beneficial for removing stains on the scale grating 10. At the same time, the air pressure blown out by the air nozzle 2401 is enhanced, and the pneumatic inclined plate 26 and push rod 27 continue to move towards the lever 38. The push rod 27 contacts the end of the lever 38 away from the sliding shaft 33, that is, the push rod 27 drives the lever 38 to rotate. Therefore, the slide head 39 and the sliding shaft 33 move towards the detection groove 6, the spring 2 35 is stretched, and the cleaning soft brush 36 is inserted into the detection groove 6 and contacts the scale grating 10. The scale grating 10 reciprocates with the mover 5, and the cleaning soft brush 36 can remove the stains on the surface of the scale grating 10.

[0057] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A mover position detection device for a submersible linear motor, comprising a base plate (1), a stator cylinder (2) provided on the base plate (1), and multiple sets of windings arranged inside the stator cylinder (2), characterized in that: The stator cylinder (2) is provided with a cap (3) at its end. The inner wall of the stator cylinder (2) is provided with a slip ring (4). A mover (5) is concentrically provided in the slip ring (4). A detection groove (6) and a sliding groove (7) are symmetrically provided on the side wall of the mover (5). The slip ring (4) and the sliding groove (7) form a sliding fit. Multiple sets of permanent magnets (8) are uniformly provided on the mover (5) along the axial direction. A protective shell (9) for protecting the permanent magnets (8) is provided between the sides of the detection groove (6) and the sliding groove (7). A scale grating (10) is provided in the groove of the detection groove (6). (3) has an inspection hole (301) and a photoelectric sensor (11) is provided at the inspection hole (301) of the cover (3). The photoelectric sensor (11) passes through the inspection hole (301) to measure the scale grating (10). The end plate of the cover (3) has a through hole (302) through which the mover (5), the detection groove (6) and the slide groove (7) pass. A sealing strip (12) is provided on the side wall of the through hole (302). There is a gap (13) between the side wall of the through hole (302) and the groove of the detection groove (6) for the scale grating (10) to pass through.

2. The mover position detection device for a submersible linear motor according to claim 1, characterized in that: The cover (3) is provided with an insertion hole (303), and the stator cylinder (2) is provided with an air pump assembly (14). The air pump assembly (14) supplies air to the first interface of the four-way connector (15). The third interface of the four-way connector (15) is connected to the inlet of the connecting pipe (16). The connecting pipe (16) is located in the insertion hole (303) and extends into the interior of the cover (3). An air curtain nozzle (17) is connected to the outlet of the connecting pipe (16). The outlet of the air curtain nozzle (17) faces the gap (13).

3. The mover position detection device for a submersible linear motor according to claim 2, characterized in that: The air pump assembly (14) includes an air cylinder (1401) vertically mounted on the base plate (1). A piston (1402) is slidably mounted in the air cylinder (1401). A telescopic rod (1403) is mounted on the piston (1402). The telescopic rod (1403) extends to the outside of the air cylinder (1401), and a connecting rod (18) is connected to the end of the telescopic rod (1403). The connecting rod (18) is connected to the mover (5). Two air holes are provided at both ends of the air cylinder (1401). One-way valve one (1404) and one-way valve two (1405) are respectively connected to the two air holes at each end of the air cylinder (1401). The two one-way valve two (1405) are respectively connected to the two inlets of the three-way pipe (1406). The outlet of the three-way pipe (1406) is connected to the first interface of the four-way connector (15).

4. The mover position detection device for a submersible linear motor according to claim 3, characterized in that: The second interface of the four-way connector (15) is connected to the inlet of the connecting pipe two (19). The connecting pipe two (19) is fixed on the cover (3) by the support plate one (20). The outlet of the connecting pipe two (19) is connected to the heat dissipation nozzle (21), and the outlet of the heat dissipation nozzle (21) faces the photoelectric sensor (11).

5. The mover position detection device for a submersible linear motor according to claim 4, characterized in that: The fourth interface of the four-way connector (15) is connected to the inlet of the connecting pipe three (22). The connecting pipe three (22) is fixed on the end plate of the cover (3) by the support plate two (23). The support plate two (23) is connected to the air nozzle (2401) of the air box (24). The air box (24) is slidably provided with a slide rod (25). One end of the slide rod (25) located inside the air box (24) is connected to a pneumatic inclined plate (26). The pneumatic inclined plate (26) is slidably provided inside the air box (24). The side of the pneumatic inclined plate (26) near the air nozzle (2401) is inclined away from the slide rod (25). The pneumatic inclined plate (26) is provided with a push rod (27). The push rod (27) extends to the outside of the air box (24). The push rod (27) is sleeved with a spring one (28). The two sides of the spring one (28) are connected to the air box (24) and the pneumatic inclined plate (26) respectively.

6. The mover position detection device for a submersible linear motor according to claim 5, characterized in that: The slide bar (25) is connected to a plug (29) at one end outside the air box (24), and the plug (29) is fitted with a sealing gasket (30) for sealing the gap (13).

7. The mover position detection device for a submersible linear motor according to claim 6, characterized in that: The outer sidewall of the air box (24) is provided with a damping ring (31) that dampens the push rod (27).

8. The mover position detection device for a submersible linear motor according to claim 7, characterized in that: The end plate of the cover (3) is provided with a sliding plate (32). A sliding shaft (33) is slidably provided on the sliding plate (32) along the vertical direction of the scale grating (10). A cleaning plate (34) is provided at one end of the sliding shaft (33) near the detection groove (6). A second spring (35) is sleeved on the outside of the sliding shaft (33). The two ends of the second spring (35) are connected to the sliding plate (32) and the cleaning plate (34) respectively. A cleaning soft brush (36) for cleaning the scale grating (10) is provided on the side of the cleaning plate (34) facing the detection groove (6).

9. The mover position detection device for a submersible linear motor according to claim 8, characterized in that: A rotating seat (37) is vertically provided on the slide plate (32). The rotating seat (37) is connected to the middle part of the lever (38). A sliding groove is provided at one end of the lever (38) near the sliding shaft (33). A sliding head (39) is provided at one end of the sliding shaft (33) away from the detection groove (6). The sliding head (39) and the sliding groove on the lever (38) form a sliding fit. The end of the lever (38) away from the sliding shaft (33) is driven by the push rod (27).

Images