CN111998873A - Be used for three redundant LVDT sensors of aerospace - Google Patents
Be used for three redundant LVDT sensors of aerospace Download PDFInfo
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- CN111998873A CN111998873A CN202010509478.2A CN202010509478A CN111998873A CN 111998873 A CN111998873 A CN 111998873A CN 202010509478 A CN202010509478 A CN 202010509478A CN 111998873 A CN111998873 A CN 111998873A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
- G01D5/2291—Linear or rotary variable differential transformers (LVDTs/RVDTs) having a single primary coil and two secondary coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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Abstract
The invention discloses a three-redundancy LVDT sensor for aerospace, which comprises a support body component, a connecting rod, a guide cylinder, a disc spring, a coil component, an iron core, a shell, a guide cylinder nut and a rear cover, wherein the support body component is arranged on the support body component; one end of each connecting rod is inserted in the shell, and the other end of each connecting rod extends out of the front end of the shell and is connected with the supporting body assembly; three guide cylinders which are distributed circumferentially are arranged in the shell, three coil assemblies are inserted on the three guide cylinders, parts of the three connecting rods which are positioned in the shell are respectively arranged in the three guide cylinders, the three connecting rods are respectively connected with three iron cores towards the direction in the shell, and the three iron cores are respectively arranged in the three guide cylinders; the rear end of the shell is provided with a rear cover. The sensor has the advantages of compact structure, small volume, light weight, high precision, good maintainability and high reliability, and solves the problems of poor maintainability, insufficient precision and the like of the traditional sensor.
Description
Technical Field
The invention belongs to the technical field of sensors, and relates to an aerospace three-redundancy LVDT sensor which is applied to a linear motion component, feeds back the position of the linear motion component and is convenient for accurate control of a system.
Background
In aviation and aerospace systems, safety, reliability and digital accurate control tend to be the trend, and the mass use of sensors is particularly important. The LVDT sensor is used as a system information acquisition unit and is used for converting the linear displacement into digital information and feeding the digital information back to the system, and the system makes corresponding judgment according to the received information, namely, the accurate control of the system is realized.
At present, the traditional LVDT sensor is generally designed in a non-redundancy mode or a dual-redundancy mode, as shown in fig. 1, a coil and a rear cover of the LVDT sensor are connected in a welding mode, and the coil part belongs to a part which cannot be replaced and maintained, so that great difficulty is brought to debugging and matching of the sensor.
Disclosure of Invention
In order to solve the problems, the invention provides the three-redundancy LVDT sensor for aerospace, the coil adopts bottom wiring, the structure is compact, the external dimension is small, the coil adopts a plug-in type design, and the maintainability is high; the compensation coil is added to the coil part, the output voltage is corrected, the precision of the LVDT sensor is improved, and fine adjustment can be achieved.
The technical scheme of the invention is as follows: a three-redundancy LVDT sensor for aerospace comprises a support body component, a connecting rod, a guide cylinder, a disc spring, a coil component, an iron core, a shell, a guide cylinder nut and a rear cover; one end of each connecting rod is inserted in the shell, and the other end of each connecting rod extends out of the front end of the shell and is connected with the supporting body assembly; three guide cylinders which are distributed circumferentially are arranged in the shell, three coil assemblies are inserted on the three guide cylinders, parts of the three connecting rods which are positioned in the shell are respectively arranged in the three guide cylinders, the three connecting rods are respectively connected with three iron cores towards the direction in the shell, and the three iron cores are respectively arranged in the three guide cylinders; the rear end of the shell is provided with a rear cover.
Furthermore, a groove is formed in the bottom of the shell, and one coil assembly lead passes through the groove in the bottom of the shell. The coil assemblies are wired at the bottom, the three coil assemblies are mutually abutted and are all tightly attached to the shell, and the structure of the coil assembly is extremely compact, so that the three-redundancy coil is arranged under the condition that the traditional double-redundancy sensor has the same overall dimension.
Furthermore, the rear cover is connected with the three guide cylinders, and the rear cover is detachably connected with the shell through guide cylinder nuts and fixes the coil assembly. Compared with the traditional LVDT sensor, the invention adds the guide cylinder, the coil component is inserted into the shell by utilizing the outer cylinder of the guide cylinder, the tail end of the guide cylinder is provided with the screw thread, the coil component is tightly pressed by the rear cover after being arranged, and the back cover is tightly pressed to prevent the coil component from loosening.
Further, the coil assembly comprises a coil rack, an exciting coil, a secondary coil I, a secondary coil II, a magnetic conduction cylinder, a lead and a filler; the exciting coil is uniformly wound in a winding groove of the coil frame, the secondary coil I and the secondary coil II are respectively and bilaterally symmetrical on the coil frame wound with the exciting coil, an iron core is inserted into the coil frame wound with all the coils, a magnetic conduction cylinder is sleeved outside the coil frame wound with all the coils, and filler is filled between the magnetic conduction cylinder and the coil frame wound with all the coils.
Furthermore, a compensation coil is wound between the secondary coil I and the secondary coil II.
Furthermore, the secondary coil I and the secondary coil II are connected in parallel and then connected in series with the compensation coil. The linear LVDT sensor has the effects that the output voltages of the two secondary coils are serially superposed with the output voltage of the sensor, the output voltage change curve of the secondary coil and the output voltage change curve of the compensation coil have opposite bending trends, so that most of curvatures are superposed and offset, the linearity of the final output voltage change curve is good, and the precision of the LVDT sensor is improved.
Further, the supporting body assembly comprises a threaded connecting rod and a supporting body; the end parts of the three connecting rods are inserted into the supporting body, the middle part of the supporting body is provided with a mounting hole of the threaded connecting rod, and the threaded connecting rod is mounted in the mounting hole in the middle part of the supporting body.
Furthermore, the support body component also comprises a compression nut, a connecting rod nut and a bearing; the two bearings are arranged in the supporting body and are adjacent to and tightly close to the polished rod in which the threaded connecting rod is arranged, the connecting rod nut is arranged in the supporting body and presses the two bearings, and the pressing nut is arranged in a hole on the side surface of the supporting body and fixes the connecting rod nut. In the support body assembly, a connection mode of double bearings is adopted, so that after the connecting rod is installed, the axial displacement (play amount) between the connecting rod and the iron core is reduced, and the output precision of the LVDT sensor is improved; the two bearings are connected by adopting a double-bearing structure, the two bearings are adjacent and close to each other, the inner ring and the outer ring of each bearing are respectively pressed by the connecting rod nut and the pressing nut, and the play is reduced due to the limitation in the axial direction after the inner ring and the outer ring of each bearing are respectively pressed by the axial force by utilizing the small difference of the thicknesses of the inner ring and the outer ring of each bearing.
The invention has the advantages that:
1. the output precision of the LVDT sensor is improved by a double-bearing connection mode;
2. the structure is compact, the volume is small, the weight is light, and three redundancies are provided;
3. when any coil fails, the coil can be detached and replaced, and the rest coils are not affected, so that the maintainability is greatly improved, and the maintenance period is shortened.
Drawings
FIG. 1 is a schematic diagram of the background art of the present invention;
FIG. 2 is a schematic view of an LVDT sensor assembly according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a coil assembly of an embodiment of the present invention;
FIG. 4 is a schematic view of a support body assembly according to an embodiment of the invention;
FIG. 5 is a schematic external view of an embodiment of the present invention;
FIG. 6 is an electrical schematic of an LVDT sensor according to an embodiment of the present invention;
the device comprises a support body assembly, a 2-connecting rod, a 3-guide cylinder, a 4-disc spring, a 5-coil assembly, a 6-iron core, a 7-shell, an 8-guide cylinder nut, a 9-rear cover, a 10-coil rack, a 11-secondary coil I, a 12-exciting coil, a 13-compensating coil, a 14-secondary coil II, a 15-magnetic conduction cylinder, a 16-lead, a 17-filler, an 18-threaded connecting rod, a 19-support body, a 20-compression nut, a 21-connecting rod nut and a 22-bearing.
Detailed Description
The purpose, technical solution and advantages of the present invention will be more clearly understood, and the technical solution in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the described embodiments are to be considered in all respects only as illustrative and not restrictive, and the scope of the invention is not to be limited thereby. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention relates to an aerospace three-redundancy LVDT sensor, which comprises a supporting body component 1, a connecting rod 2, a guide cylinder 3, a disc spring 4, a coil component 5, an iron core 6, a shell 7, a guide cylinder nut 8 and a rear cover 9; one ends of the three connecting rods 2 are inserted in the shell 7, and the other ends of the three connecting rods extend out of the front end of the shell 7 and are connected with the supporting body assembly 1; three guide cylinders 3 distributed circumferentially are arranged in a shell 7, three coil assemblies 5 are inserted on the three guide cylinders 3, the parts of three connecting rods 2 positioned in the shell 7 are respectively arranged in the three guide cylinders 3, the three connecting rods 2 are respectively connected with three iron cores 6 towards the direction in the shell 7, and the three iron cores 6 are respectively arranged in the three guide cylinders 3; the rear end of the housing 7 is provided with a rear cover 9.
The bottom of the shell 7 is provided with a groove, and the wire of one coil assembly 5 passes through the groove at the bottom of the shell 7. The coil assemblies 5 are wired at the bottom, the three coil assemblies 5 are mutually abutted and are tightly attached to the shell 7, and the structure is extremely compact, so that three-redundancy coils are arranged under the condition that the traditional double-redundancy sensor has the same overall dimension.
The rear cover 9 is connected with the three guide cylinders 3, and the rear cover 9 is detachably connected with the housing 7 through the guide cylinder nuts 8 and fixes the coil assembly 5. Compared with the traditional LVDT sensor, the invention adds the guide cylinder 3, the coil component 5 is inserted into the shell by utilizing the outer cylinder of the guide cylinder, the tail end of the guide cylinder 3 is provided with the screw thread, the rear cover 9 is arranged to tightly press the coil component 5, and then the coil component 5 is tightly pressed by the nut 8 to prevent looseness.
The coil component 5 comprises a coil rack 10, an exciting coil 12, a secondary coil I11, a secondary coil II 14, a magnetic conduction cylinder 15, a lead 16 and a filler 17; the exciting coil 12 is uniformly wound in a winding slot of the coil frame 10, the secondary coil I11 and the secondary coil II 14 are respectively and bilaterally symmetrical on the coil frame 10 wound with the exciting coil 12, the iron core 6 is inserted in the coil frame 10 wound with all the coils, the magnetic conduction cylinder 15 is sleeved outside the coil frame 10 wound with all the coils, and the filler 17 is filled between the magnetic conduction cylinder 15 and the coil frame 10 wound with all the coils.
A compensation coil 13 is further wound between the secondary coil I11 and the secondary coil II 14, and the secondary coil I11 and the secondary coil II 14 are connected in parallel and then connected in series with the compensation coil 13. The linear LVDT sensor has the effects that the output voltages of the two secondary coils are serially superposed with the output voltage of the sensor, the output voltage change curve of the secondary coil is opposite to the bending trend of the output voltage change curve of the compensation coil 13, so that most of curvatures are superposed and offset, the linearity of the final output voltage change curve is good, and the precision of the LVDT sensor is improved.
The supporting body component 1 comprises a threaded connecting rod 18 and a supporting body 19; the ends of the three connecting rods 2 are inserted into a supporting body 19, the middle part of the supporting body 19 is provided with a mounting hole of a threaded connecting rod 18, and the threaded connecting rod 18 is mounted in the mounting hole in the middle part of the supporting body 19. The support body assembly 1 further comprises a compression nut 20, a connecting rod nut 21 and a bearing 22; two bearings 22 are provided in the support body 19 and abut against the polish rod fitted into the threaded connecting rod 18, a connecting rod nut 21 is provided in the support body 19 to press the two bearings 22, and a pressing nut 20 is provided in a hole in the side of the support body 19 to fix the connecting rod nut 21. In the support body assembly 1, the connection mode of the double bearings 22 is adopted, so that the axial displacement (play amount) between the connecting rod 2 and the iron core 6 is reduced after the connecting rod is installed, and the output precision of the LVDT sensor is improved; the double bearings 22 are adopted for connection, the two bearings 22 are abutted adjacently, the inner ring and the outer ring of the bearing 22 are respectively pressed by the connecting rod nut 21 and the pressing nut 20, and the play is reduced due to limitation in the axial direction after the inner ring and the outer ring of the two bearings 22 are respectively pressed by axial force by utilizing the slight difference of the thicknesses of the inner ring and the outer ring of the bearing 22.
Other embodiments of the present invention will be described below with reference to the accompanying drawings.
The invention provides an aerospace three-redundancy LVDT sensor, which is mainly composed of a support body component 1, a connecting rod 2, a guide cylinder 3, a disc spring 4, a coil component 5, an iron core 6, a shell 7, a guide cylinder nut 8, a rear cover 9 and the like, as shown in figure 1.
As shown in the attached figure 2, the guide cylinder 3 and the shell 7 are pressed in an interference fit manner, the guide cylinder 3 is distributed on the circumference, the disc spring 4 is arranged, then three coil assemblies 5 are respectively inserted on the guide cylinder 3, the wire of one coil assembly 5 passes through the wire in the groove at the bottom of the shell, the rear cover 9 is arranged, the guide cylinder nut 8 is screwed to prevent the coil assembly from moving, and finally the support body assembly 1, the connecting rod 2 and the iron core 6 are assembled to finish the assembly of the whole sensor.
As shown in fig. 3, the coil assembly 5 mainly includes a coil frame 10, an excitation coil 12, a secondary coil i 11, a secondary coil ii 14, a compensation coil 13, a magnetic conductive cylinder 15, a lead 16, a filler 17, and the like. When the coil is wound, the exciting coil 12 is uniformly wound in a winding groove of the coil frame 10, then the secondary coil I11 and the secondary coil II 14 are symmetrically wound in the left and right directions, finally the compensating coil 13 is wound in the middle position, the iron core 6 is loaded in a test bed for modulation after the winding is finished, the output value of the sensor is adjusted by adjusting the number of turns of the compensating coil 13, a lead 16 is welded after the output value is qualified, and the coil assembly 5 is assembled after the upper filler 17 is dried after the coil is inserted into the magnetic conduction cylinder 15.
As shown in figure 4, two bearings 22 are adjacently abutted against the polished rod which is arranged in the threaded connecting rod 18, are tightly pressed by a connecting rod nut 21 and then are arranged in the supporting body 19 together, and finally are tightly screwed by a pressing nut 20, so that the assembly is completed.
The threaded connecting rod 18 and the supporting body 19 are connected through the bearing 22, the threaded connecting rod 18 can rotate 360 degrees around the axial direction, during installation, the threaded connecting rod 18 is screwed into a moving part of the system, a nut is adopted for tightening the back, then the shell is inserted into a system installation hole, a sealing ring is used in the hole for radial sealing, then a sensor flange plate is connected through a bolt, and meanwhile, the iron core 6 is inserted into the guide cylinder 3, and installation can be completed.
As shown in fig. 6, when the excitation coil is energized, a current passes through the excitation coil to generate a magnetic field, an iron core capable of moving back and forth is arranged in the coil assembly, when the iron core moves, the distribution of the spatial magnetic field is changed, and according to an electromagnetic induction phenomenon, the change of the magnetic field distribution can cause the magnetic flux of the secondary coil to change, so that the induced electromotive force generated on the secondary coil changes, and further the current changes. The resistance element is connected in the closed loop of the secondary coil, so that the change of the current is converted into the change of the output voltage, and the change condition of the displacement of the iron core is reflected indirectly. Since the two secondary coil voltages are of opposite polarity, the sensor output is the difference between the two secondary coil voltages. The voltage value and the displacement of the iron core are in linear relation.
When the longitudinal center of the iron core is coincident with the center of the coil, the induced electromotive forces of the two secondary coils are equal and the phases are opposite, so that the difference value of the output voltages of the two secondary coils is zero, and at the moment, the iron core is called to be at an electric zero position.
The sensor is characterized in that:
firstly, adopt duplex bearing to connect, reduce the amount of play
In the support body assembly 1, a connection mode of double bearings 22 is adopted, inner rings and outer rings of the bearings 22 are respectively pressed by a connecting rod nut 21 and a pressing nut 20, and after the inner rings and the outer rings of the two bearings 22 are respectively pressed by axial force by utilizing the small difference of the thicknesses of the inner rings and the outer rings of the bearings 22, the axial displacement (play amount) between the connecting rod 2 and the iron core 6 is reduced after the connecting rod 2 is installed, and the output precision of the LVDT sensor is improved.
Secondly, the coil assembly adopts bottom wiring to reduce the radial dimension
The coil assemblies 5 are wired at the bottom, the three coil assemblies 5 are mutually abutted and are tightly attached to the shell 7, and the structure is extremely compact, so that three-redundancy coils are arranged under the condition that the traditional double-redundancy sensor has the same overall dimension.
Thirdly, the coil assembly adopts a plug-in type design, so that the maintainability is improved
Compared with the traditional LVDT sensor, the invention adds the guide cylinder 3, the coil component 5 is inserted into the shell by utilizing the outer cylinder of the guide cylinder, the tail end of the guide cylinder 3 is provided with the screw thread, the rear cover 9 is arranged to tightly press the coil component 5, and then the coil component 5 is tightly pressed by the nut 8 to prevent looseness.
Fourthly, a compensation coil is added to improve the output precision of the coil
The compensation coil is additionally arranged in the middle of the coil component 5, the secondary coil I11 and the secondary coil II 14 are connected in parallel and then connected in series with the compensation coil 13, the function of the compensation coil is that the output voltages of the two secondary coils are connected in series and overlapped with the output voltage of the compensation coil 13, the output voltage change curve of the secondary coil and the output voltage change curve of the compensation coil 13 have opposite bending trends, so that most of curvatures are overlapped and offset, the linearity of the output voltage change curve is good finally, and the precision of the LVDT sensor is improved.
Claims (8)
1. The three-redundancy LVDT sensor for aerospace is characterized by comprising a support body component (1), a connecting rod (2), a guide cylinder (3), a disc spring (4), a coil component (5), an iron core (6), a shell (7), a guide cylinder nut (8) and a rear cover (9); one ends of the three connecting rods (2) are inserted in the shell (7), and the other ends of the three connecting rods extend out of the front end of the shell (7) and are connected with the supporting body assembly (1); three guide cylinders (3) which are distributed circumferentially are arranged in a shell (7), three coil assemblies (5) are inserted into the three guide cylinders (3), the parts of the three connecting rods (2) which are positioned in the shell (7) are respectively arranged in the three guide cylinders (3), the three connecting rods (2) are respectively connected with three iron cores (6) towards the direction in the shell (7), and the three iron cores (6) are respectively arranged in the three guide cylinders (3); the rear end of the shell (7) is provided with a rear cover (9).
2. The LVDT sensor according to claim 1, wherein the bottom of the casing (7) is provided with a slot, and the wire of one coil assembly (5) is passed through the slot at the bottom of the casing (7).
3. The LVDT sensor according to claim 1, wherein the rear cover (9) is connected to the three guide cylinders (3), and the rear cover (9) is detachably connected to the housing (7) via the guide cylinder nut (8) and fixes the coil assembly (5).
4. The LVDT sensor according to claim 1, wherein the coil assembly (5) comprises a coil former (10), an excitation coil (12), a secondary coil I (11), a secondary coil II (14), a magnetic conductive cylinder (15), a lead wire (16), and a filler (17); the exciting coil (12) is uniformly wound in a winding groove of the coil frame (10), the secondary coil I (11) and the secondary coil II (14) are respectively in bilateral symmetry on the coil frame (10) wound with the exciting coil (12), the iron core (6) is inserted into the coil frame (10) wound with all the coils, the magnetic conduction cylinder (15) is sleeved outside the coil frame (10), and the filler (17) is filled between the magnetic conduction cylinder (15) and the coil frame (10) wound with all the coils.
5. The LVDT sensor for aerospace according to claim 4, wherein a compensation coil (13) is further wound between the secondary coil I (11) and the secondary coil II (14).
6. The LVDT sensor for aerospace according to claim 5, wherein the secondary coil I (11) is connected in parallel with the secondary coil II (14) and then connected in series with the compensation coil (13).
7. The LVDT sensor for aerospace triple redundancy according to claim 1, wherein the support body assembly (1) comprises a threaded connection rod (18), a support body (19); the end parts of the three connecting rods (2) are inserted into the supporting body (19), the middle part of the supporting body (19) is provided with a mounting hole of the threaded connecting rod (18), and the threaded connecting rod (18) is mounted in the mounting hole in the middle part of the supporting body (19).
8. The LVDT sensor for aerospace according to claim 7, wherein the support body assembly (1) further comprises a compression nut (20), a connecting rod nut (21) and a bearing (22); two bearings (22) are arranged in the supporting body (19) and are adjacent to and abutted against the polished rod in which the threaded connecting rod (18) is arranged, the connecting rod nut (21) is arranged in the supporting body (19) to press the two bearings (22), and the pressing nut (20) is arranged in a hole on the side surface of the supporting body (19) to fix the connecting rod nut (21).
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Cited By (1)
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| CN114017408A (en) * | 2021-10-27 | 2022-02-08 | 上海衡拓液压控制技术有限公司 | Three-redundancy jet pipe electro-hydraulic servo valve with displacement feedback |
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| CN111998873B (en) | 2022-04-15 |
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