CN115680637B - Electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer - Google Patents
Electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer Download PDFInfo
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- CN115680637B CN115680637B CN202211029763.XA CN202211029763A CN115680637B CN 115680637 B CN115680637 B CN 115680637B CN 202211029763 A CN202211029763 A CN 202211029763A CN 115680637 B CN115680637 B CN 115680637B
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Abstract
The application discloses electromagnetic low frequency bend Zhang Shanji son sound wave logging transmitting transducer includes: a bottom bracket tube; the soft iron cover is fixedly sleeved on the periphery of the middle shaft tube and is provided with a cylindrical groove; the permanent magnet is fixedly sleeved on the periphery of the middle shaft tube, is positioned in the cylindrical groove and is propped against the bottom surface of the cylindrical groove; the soft iron bottom is fixedly sleeved on the periphery of the middle shaft tube and is propped against the end face of the permanent magnet; the driving cover is fixedly sleeved on the periphery of the middle shaft tube, the end part of the driving cover facing the soft iron cover stretches into the magnetic gap, and a coil is wound on the outer wall of the end part of the driving cover stretching into the magnetic gap; the vibration body is fixedly sleeved on the periphery of the middle shaft tube and fixedly connected with the driving cover, and comprises an upper connecting ring and a lower connecting ring, and a plurality of circular arc vibration sheets are arranged between the upper connecting ring and the lower connecting ring; the electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer arranged in the mode can meet the excitation of a low-frequency acoustic source in a small-size environment and the purpose of acoustic remote detection.
Description
Technical Field
The application relates to the technical field of acoustic logging, in particular to an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer.
Background
The attenuation of the acoustic wave in the formation is frequency dependent, the lower the frequency, the slower the attenuation and the farther the detection distance. The frequency of a high-frequency piezoelectric monopole sound source commonly used in traditional acoustic logging is about 15kHz, the volume of a transducer has to be increased to reduce the emission frequency of the transducer, however, a logging instrument needs to work in a downhole small-size environment, so that the piezoelectric monopole sound source is not beneficial to long-distance detection. The conventional magnetostrictive material-driven flextensional transducer can generate a low-frequency sound source, has the characteristics of large strain displacement, high energy density and the like, but is sensitive to temperature change, and the efficiency of the magnetostrictive material is greatly reduced in a high-temperature high-pressure underground environment.
Therefore, how to design an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer capable of meeting the excitation of a low-frequency sound source in a small-size environment and meeting the long-distance detection of acoustic waves is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The utility model provides an object provides an electromagnetic type low frequency is curved Zhang Shanji son sound wave logging transmitting transducer, overcomes the problem that can not produce the low frequency sound source in the high temperature and high pressure and the small-size environment in the pit among the prior art, and this electromagnetic type low frequency is curved Zhang Shanji son sound wave logging transmitting transducer can satisfy the requirement of small-size in the pit, can produce the low frequency sound source again, satisfies the long-range detection demand around the borehole.
To achieve the above object, the present application provides an electromagnetic low-frequency bending Zhang Shanji sub-sonic logging transmitting transducer, including:
a bottom bracket tube;
the soft iron cover is fixedly sleeved on the periphery of the middle shaft tube, and a cylindrical groove coaxial with the middle shaft tube is formed in the soft iron cover;
the permanent magnet is fixedly sleeved on the periphery of the middle shaft tube, is positioned in the cylindrical groove and is propped against the bottom surface of the cylindrical groove;
the soft iron bottom is fixedly sleeved on the periphery of the middle shaft tube and is propped against the end face of the permanent magnet, which is away from the bottom surface of the cylindrical groove, and the permanent magnet and the soft iron bottom are arranged at intervals with the inner wall of the cylindrical groove to form an annular magnetic gap;
the driving cover is fixedly sleeved on the periphery of the middle shaft tube and is arranged at intervals with the outer wall of the middle shaft tube, the end part of the driving cover, which faces the soft iron cover, stretches into the magnetic gap and is arranged at intervals with the permanent magnet, the soft iron bottom and the soft iron cover, the outer wall of the end part of the driving cover, which stretches into the magnetic gap, is wound with a coil, and the coil is positioned in a constant magnetic field generated by the permanent magnet;
the vibration body is fixedly sleeved on the periphery of the middle shaft tube and is fixedly connected with the end part of the driving cover, which deviates from the coil, and the vibration body comprises an upper connecting ring connected with the driving cover and a lower connecting ring fixedly connected with the middle shaft tube, a plurality of circular arc vibration sheets are arranged between the upper connecting ring and the lower connecting ring, and the circular arc vibration sheets are arranged at intervals with the outer wall of the middle shaft tube.
Preferably, the permanent magnet and the soft iron bottom are in a ring shape, the inner diameter and the outer diameter of the permanent magnet are the same, and the end face of the soft iron cover exceeds the end face of the soft iron bottom, namely, the permanent magnet and the soft iron bottom are both positioned in the cylindrical groove.
Preferably, the section of the circular arc vibration sheet is an arc with a specific curvature, the arc rotates along the axis of the central shaft to form the circular arc vibration sheets, the number of the circular arc vibration sheets is 8-16, a plurality of circular arc vibration sheets are circumferentially distributed along the central shaft to form a concave kidney-shaped cylinder, and vibration sheet slits are formed between adjacent circular arc vibration sheets.
Preferably, the end of the driving cover extending into the magnetic gap is provided with a groove on the outer wall, the groove is internally carved with a spiral line, the coil is wound in the groove according to the spiral line, and the midpoint of the coil in the height direction and the midpoint of the soft iron bottom in the thickness direction are positioned on the same horizontal plane.
Preferably, two wire-passing holes penetrating through the outer wall of the middle shaft tube are formed in the outer wall of the middle shaft tube, and a wire of the coil enters the middle shaft tube through the two wire-passing holes and is connected with an external circuit.
Preferably, the middle shaft tube is of a hollow tubular structure, a protruding platform is arranged on the outer wall of the middle shaft tube, a gasket is clamped between the protruding platform and the soft iron bottom, and the inner diameter and the outer diameter of the gasket, the inner diameter and the outer diameter of the permanent magnet and the inner diameter of the soft iron bottom are the same.
Preferably, the end face of the soft iron cover, which faces away from the cylindrical groove, abuts against a gland, and the gland comprises:
the lower gland is annular and sleeved on the periphery of the middle shaft tube and is used for propping against the soft iron cover, and the outer diameter of the lower gland is smaller than that of the soft iron cover;
the upper gland is cylindrical, sleeved on the periphery of the middle shaft tube and fixedly connected with the lower gland, the lower gland is fixedly arranged on the middle shaft tube, a limit groove is formed in the inner wall of the upper gland, and the limit groove surrounds the inner wall of the gland for a circle and is used for positioning the position of the gland on the middle shaft tube;
the gland is matched with the protruding platform, and the soft iron cover, the permanent magnet, the soft iron bottom and the gasket are fixedly pressed on the middle shaft tube.
Preferably, the lower connecting ring is fixedly connected with the bottom bracket tube through a base, and the base comprises:
the upper base is annular and sleeved on the periphery of the middle shaft tube, a fan-shaped through groove penetrating the upper base is formed in the end face of the upper base, and the outer wall of the upper base is abutted against the inner wall of the lower connecting ring and fixedly connected with the inner wall of the lower connecting ring;
the lower base is cylindrical, is fixedly connected with the upper base, is sleeved on the periphery of the middle shaft tube, and is fixedly arranged on the middle shaft tube.
Preferably, a plurality of circular angle rectangular grooves are formed in the outer wall of the center shaft pipe along the circumferential direction of the center shaft pipe, the circular angle rectangular grooves at the same axial position form circular angle rectangular groove groups, 3 circular angle rectangular groove groups are arranged on the side wall of the center shaft pipe along the axial direction at intervals, the circular angle rectangular grooves are arranged in an axial staggered mode, the forming positions of the circular angle rectangular grooves correspond to the circular arc vibration plates, the circular angle rectangular grooves are matched with the fan-shaped through grooves for use, and the circular angle rectangular grooves are used for guiding fluid on the inner sides of the circular arc vibration plates and discharging internal energy.
Preferably, the drive cap material is a non-conductive high temperature resistant material.
For above-mentioned background art, in the electromagnetic type low frequency bend Zhang Shanji son sound wave logging transmitting transducer of this application, soft iron cover, permanent magnet and soft iron bottom constitute magnetic circuit structure, and magnetic circuit structure is fixed to be set up on the central siphon, and the permanent magnet both ends face supports respectively and hold soft iron cover and soft iron bottom, and soft iron bottom pad has the gasket to prevent the fracture of permanent magnet and soft iron bottom at vibration in-process, and the constant magnetic field that the permanent magnet produced gathers in the magnetic gap through soft iron cover and soft iron bottom's conduction, has guaranteed the utilization ratio of magnetic field.
In addition, in the electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer, the vibrating body comprises the upper connecting ring, the lower connecting ring and the circular arc vibrating piece, the driving cover is fixed with the vibrating body, the vibrating body is fixedly connected with the center shaft tube, the coil on the driving cover is positioned in a magnetic gap magnetic field, and when alternating current is introduced into the coil, the driving cover generates alternating force to drive the vibrating body to vibrate up and down, so that the circular arc vibrating piece vibrates, low-frequency acoustic waves are radiated to the surrounding, excitation of a low-frequency acoustic source in a small-size environment can be met, and the requirement of long-distance detection of the acoustic waves is met.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of an external structure of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present application;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
fig. 3 is a schematic diagram of a bottom bracket tube structure of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present application;
fig. 4 is a schematic diagram of a gland structure of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a gland cross-section structure of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a cross-sectional structure of a soft iron cover of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of a permanent magnet perspective structure of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present application;
fig. 8 is a schematic diagram of a soft iron bottom perspective structure of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of a storefront perspective structure of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present application;
fig. 10 is a schematic diagram of a driving cover of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present disclosure;
fig. 11 is a schematic diagram of a cross-sectional structure of a driving cover of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present disclosure;
fig. 12 is a schematic diagram of a vibrator perspective structure of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present disclosure;
fig. 13 is a schematic perspective view of a base of an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to an embodiment of the present application.
In the figure: 1. the middle shaft tube 11, the protruding platform 12, the wiring hole 13 and the circular angle rectangular groove;
2. gland 21, upper gland 22, lower gland 23, limit groove;
3. a soft iron cover 31, a cylindrical groove;
4. a permanent magnet;
5. a soft iron bottom;
6. a gasket;
7. a drive cover 71, a coil;
8. a vibrator 81, an upper connecting ring 82, a circular arc vibrating piece 83, a lower connecting ring 84 and a vibrating piece slit;
9. the base 91, the upper base 92, the lower base 93, and the fan-shaped through groove.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In order to better understand the aspects of the present application, a further detailed description of the present application will be provided below with reference to the accompanying drawings and detailed description.
As shown in fig. 1 to 13, in the present embodiment, an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer is provided, which comprises a middle shaft tube 1, a soft iron cover 3, a permanent magnet 4, a soft iron bottom 5, a driving cover 7 and a vibrator 8, wherein the soft iron cover 3, the permanent magnet 4 and the soft iron bottom 5 form a magnetic circuit structure, the magnetic circuit structure is fixedly arranged on the middle shaft tube 1, two end surfaces of the permanent magnet 4 respectively support against the soft iron cover 3 and the soft iron bottom 5, specifically, the soft iron cover 3 is fixedly sleeved on the periphery of the middle shaft tube 1, and a cylindrical groove 31 coaxial with the middle shaft tube 1 is arranged on the soft iron cover 3; the permanent magnet 4 is fixedly sleeved on the periphery of the middle shaft tube 1, is positioned in the cylindrical groove 31 and is propped against the bottom surface of the cylindrical groove 31; the fixed cover of bottom of the soft iron 5 locates central siphon 1 periphery, and supports with the terminal surface that permanent magnet 4 deviates from the cylindricality groove 31 bottom surface and hold, and permanent magnet 4, bottom of the soft iron 5 all set up with cylindricality groove 31 inner wall interval, form annular magnetic gap, and the invariable magnetic field that permanent magnet 4 produced gathers in the magnetic gap through the conduction of bottom of the soft iron 3 and the soft iron 5, has guaranteed the utilization ratio of magnetic field.
In addition, the vibrating body 8 comprises an upper connecting ring 81, a lower connecting ring 83 and an arc vibrating piece 82, the driving cover 7 is fixedly connected with the vibrating body 8, the vibrating body 8 is fixedly connected with the center shaft tube 1, the coil 71 on the driving cover 7 is positioned in a magnetic gap magnetic field, when alternating current is introduced into the coil 71, the driving cover 7 generates alternating force to drive the vibrating body 8 to vibrate up and down, so that the arc vibrating piece 82 vibrates and radiates low-frequency sound waves to the surrounding, the excitation of a low-frequency sound source in a small-size environment can be met, and the requirement of long-distance detection of the sound waves is met.
The driving cover 7 is fixedly sleeved on the periphery of the bottom bracket tube 1 and is arranged at intervals with the outer wall of the bottom bracket tube 1, the end part of the driving cover 7 facing the soft iron cover 3 extends into the magnetic gap and is arranged at intervals with the permanent magnet 4, the soft iron bottom 5 and the soft iron cover 3, the outer wall of the end part of the driving cover 7 extending into the magnetic gap is wound with the coil 71, and the coil 71 is positioned in a constant magnetic field generated by the permanent magnet 4.
Specifically, the vibrating body 8 is fixedly sleeved on the periphery of the bottom bracket tube 1 and fixedly connected with the end part of the driving cover 7, which is away from the coil 71, and comprises an upper connecting ring 81 connected with the driving cover 7 and a lower connecting ring 83 fixedly connected with the bottom bracket tube 1, a plurality of circular arc vibrating pieces 82 are arranged between the upper connecting ring 81 and the lower connecting ring 83, and the circular arc vibrating pieces 82 are arranged at intervals with the outer wall of the bottom bracket tube 1.
In this embodiment, the middle shaft tube 1, the magnetic circuit structure, the driving cover 7 and the vibrator 8 are made of metal materials to form an electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer, the magnetic circuit structure converges the magnetic field generated by the permanent magnet 4 in the annular magnetic gap through the soft iron cover 3 and the soft iron bottom 5, the coil 71 on the driving cover 7 is positioned in the magnetic field, the driving cover 7 is fixed with the vibrator 8, the bottom of the vibrator 8 is fixed on the base 9, and the position of the driving cover 7 in the air gap is changed by adjusting the height of the base 9.
The electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer arranged in the mode is small in size, high in transmitting sound pressure, capable of meeting the requirement of acoustic logging on a low-frequency sound source and beneficial to popularization and use.
As shown in fig. 6, 7 and 8, in this embodiment, the permanent magnet and the soft iron bottom 5 are in a ring shape, the inner diameter and the outer diameter of the permanent magnet 4 are the same as those of the soft iron bottom 5, and the end face of the soft iron cover 3 exceeds the end face of the soft iron bottom 5, that is, the permanent magnet 4 and the soft iron bottom 5 are both positioned in the cylindrical groove 31.
As shown in fig. 2, the soft iron cover 3, the permanent magnet 4 and the soft iron bottom 5 form a magnetic circuit structure to form a circular magnetic gap, and the soft iron cover 3 and the soft iron bottom 5 collect magnetic lines of force generated by the permanent magnet 4 into the magnetic gap, so that the magnetic gap has stronger magnetic flux density, and sufficient driving force is provided for vibration of the vibrator 8.
In this embodiment, the soft iron cover 3 has a cover-like structure, and is capable of covering the permanent magnet 4 and the soft iron bottom 5, and has a distance from the upper end of the vibrator 8 of not less than 2.5mm, and the outer diameter of the soft iron cover 3 is not greater than 72mm.
As shown in fig. 4 and 5, the end surface of the soft iron cover 3 facing away from the cylindrical groove 31 abuts against the gland 2, and the gland 2 includes: the lower gland 22 is annular and sleeved on the periphery of the middle shaft tube 1 and is used for being propped against the soft iron cover 3, and the outer diameter of the lower gland 22 is smaller than that of the soft iron cover 3; the upper gland 21 is cylindrical, is sleeved on the periphery of the middle shaft tube 1, and is fixedly connected with the lower gland 22, and the lower gland 22 is fixedly arranged on the middle shaft tube 1; the inner wall of the upper gland 21 is provided with a limit groove 23, and the limit groove 23 surrounds a circle along the inner wall of the upper gland 21 and is used for positioning the position of the gland 2 on the bottom bracket tube 1.
As shown in fig. 2 and 3, the middle shaft tube 1 is of a hollow tubular structure, a protruding platform 11 is arranged on the outer wall of the middle shaft tube, a gasket 6 is clamped between the protruding platform 11 and the soft iron bottom 5, and the inner diameter and the outer diameter of the gasket 6 are the same as those of the permanent magnet 4 and the soft iron bottom 5.
In this embodiment, as shown in fig. 7, 8 and 9, the permanent magnet 4, the soft iron bottom 5 and the gasket 6 have identical structures and are all ring-shaped, the inner diameter and the outer diameter of the permanent magnet 4, the soft iron bottom 5 and the gasket 6 are kept identical, the height of the permanent magnet 4 is 10mm, the height of the soft iron bottom 5 is 8mm, and the height of the gasket 6 is 3mm.
As shown in fig. 2, the gland 2 cooperates with the projecting platform 11 to fix and compress the soft iron cover 3, the permanent magnet 4, the soft iron bottom 5 and the gasket 6 on the bottom bracket tube 1.
As shown in fig. 10 and 11, in the present embodiment, the driving cover 7 is divided into an upper part and a lower part, the upper part and the lower part are smoothly connected, the upper part of the driving cover 7 is positioned in the magnetic gap, the outer wall of the upper part of the driving cover 7 is carved with a groove with the depth of 0.2mm and the height of 10mm, the groove is carved with spiral lines, the coil 71 is wound in the groove according to the spiral lines, and in the present embodiment, the thickness of the upper part of the driving cover 7 is not more than 1.5mm; further, as shown in fig. 2, the midpoint of the coil 71 in its height direction and the midpoint of the soft iron base 5 in its thickness direction are on the same level.
In this embodiment, as shown in fig. 12, the cross section of the circular arc vibration plate 82 is an arc with a specific curvature, the resonant frequency can be adjusted by changing the curvature, the arc rotates along the axis of the central shaft tube 1 to form circular arc vibration plates 82, the number of the circular arc vibration plates 82 is 8-16, a plurality of circular arc vibration plates 82 are distributed along the circumferential direction of the central shaft tube 1 to form a concave kidney-shaped cylinder, and vibration plate slits 84 are arranged between adjacent circular arc vibration plates 82.
Specifically, the arc vibration plate is subjected to linear cutting treatment, the arc vibration plate is cut into 8 equal-sized plates, 8 bolt holes are respectively formed in the upper connecting ring 81 and the lower connecting ring 83, and the arc vibration plate is uniformly distributed on the circumference and corresponds to the bolt holes in the driving cover 7 and the base 9 respectively; of course, other fixing methods may be adopted to ensure that the vibrator 8 is stably connected with the base 9 and that the vibrator 8 is stably connected with the driving cover 7, and in the above embodiment, the width of the vibrating piece slit 84 is 1.5mm, and the included angle between the adjacent slits is 45 °.
In addition, when the driving cover 7 is fixed with the vibrator 8, the upper surface of the upper connecting ring 81 may be in the same plane as the upper surface of the lower part of the driving cover 7, and the height of the upper connecting ring 81 is slightly greater than the lower part of the driving cover 7; when the vibrator 8 is fixed to the base 9, the lower connecting ring 83 is fixed to the upper base 91, the lower surface of the lower connecting ring 83 is flush with the lower surface of the upper base 91, and the height of the lower connecting ring 83 is slightly greater than the height of the upper base 91.
As shown in fig. 3, two wiring holes 12 penetrating the outer wall of the central shaft tube 1 are provided on the outer wall of the central shaft tube 1, and the wires of the coil 71 enter the central shaft tube 1 through the two wiring holes 12 and are connected with an external circuit.
As shown in fig. 12 and 13, the lower connecting ring 83 is fixedly connected to the bottom bracket tube 1 through the base 9, and the base 9 includes: the upper base 91 is annular, is sleeved on the periphery of the center shaft tube 1, is provided with a fan-shaped through groove 93 penetrating through the upper base 91 on the end surface, and the outer wall of the upper base 91 is abutted against the inner wall of the lower connecting ring 83 and fixedly connected with the inner wall of the lower connecting ring; the lower base 92 is cylindrical, is fixedly connected with the upper base 91, is sleeved on the periphery of the middle shaft tube 1, and is fixedly arranged on the middle shaft tube 1, and the specific fixing mode can be that a threaded hole is formed in the lower base 92 and is fixedly connected with the middle shaft tube 1 through a bolt, and of course, other modes can be adopted for fixing, and the details are not described here.
It should be noted that, as shown in fig. 3, the outer wall of the middle shaft tube 1 is provided with a plurality of circular angle rectangular grooves 13 along the circumferential direction thereof, the circular angle rectangular grooves 13 at the same axial position form a circular angle rectangular groove group, the side wall of the middle shaft tube 1 is provided with 3 circular angle rectangular groove groups along the axial interval, the plurality of circular angle rectangular grooves 13 are arranged in an axial staggered manner, the opening positions of the circular angle rectangular grooves 13 correspond to the circular arc vibration plates 82, and the circular angle rectangular grooves 13 are matched with the fan-shaped through grooves 93 for guiding fluid at the inner side of the circular arc vibration plates 82 and discharging internal energy.
In the above embodiment, the material of the driving cover 7 is a non-conductive high temperature resistant material such as polyetheretherketone or the like.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
Specific examples are set forth herein to illustrate the principles and embodiments of the present application, and the description of the examples above is only intended to assist in understanding the methods of the present application and their core ideas. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
Claims (7)
1. An electromagnetic low frequency bend Zhang Shanji subsonic logging transmitting transducer, comprising:
a bottom bracket tube;
the soft iron cover is fixedly sleeved on the periphery of the middle shaft tube, and a cylindrical groove coaxial with the middle shaft tube is formed in the soft iron cover;
the permanent magnet is fixedly sleeved on the periphery of the middle shaft tube, is positioned in the cylindrical groove and is propped against the bottom surface of the cylindrical groove;
the soft iron bottom is fixedly sleeved on the periphery of the middle shaft tube and is propped against the end face of the permanent magnet, which is away from the bottom surface of the cylindrical groove, and the permanent magnet and the soft iron bottom are arranged at intervals with the inner wall of the cylindrical groove to form an annular magnetic gap;
the driving cover is fixedly sleeved on the periphery of the middle shaft tube and is arranged at intervals with the outer wall of the middle shaft tube, the end part of the driving cover, which faces the soft iron cover, extends into the magnetic gap, is arranged at intervals with the permanent magnet, the soft iron bottom and the soft iron cover, the outer wall of the end part of the driving cover, which extends into the magnetic gap, is wound with a coil, and the coil is positioned in a constant magnetic field generated by the permanent magnet;
the vibration body is fixedly sleeved on the periphery of the middle shaft tube and fixedly connected with the end part of the driving cover, which is away from the coil, and comprises an upper connecting ring connected with the driving cover and a lower connecting ring fixedly connected with the middle shaft tube, a plurality of circular arc vibration sheets are arranged between the upper connecting ring and the lower connecting ring, and the circular arc vibration sheets are arranged at intervals with the outer wall of the middle shaft tube;
the middle shaft tube is of a hollow tubular structure, a protruding platform is arranged on the outer wall of the middle shaft tube, a gasket is clamped between the protruding platform and the soft iron bottom, and the inner diameter and the outer diameter of the gasket are the same as those of the permanent magnet and the inner diameter of the soft iron bottom;
wherein, lower go-between pass through the base with axis pipe fixed connection, the base includes:
the upper base is annular and sleeved on the periphery of the middle shaft tube, a fan-shaped through groove penetrating the upper base is formed in the end face of the upper base, and the outer wall of the upper base is abutted against the inner wall of the lower connecting ring and fixedly connected with the inner wall of the lower connecting ring;
the lower base is cylindrical, is fixedly connected with the upper base, is sleeved on the periphery of the middle shaft tube, and is fixedly arranged on the middle shaft tube;
a plurality of round rectangular grooves are formed in the outer wall of the middle shaft pipe along the circumferential direction of the middle shaft pipe, round rectangular groove groups are formed by round rectangular grooves at the same axial position, 3 round rectangular groove groups are arranged on the side wall of the middle shaft pipe at intervals along the axial direction, the circular arc vibration plates are arranged on the inner side of the circular arc vibration plates, and the circular arc vibration plates are arranged on the inner side of the circular arc vibration plates.
2. The electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to claim 1, wherein the permanent magnet and the soft iron bottom are ring-shaped, the inner diameter and the outer diameter of the permanent magnet are the same, and the end face of the soft iron cover exceeds the bottom end face of the soft iron, namely the permanent magnet and the soft iron bottom are both positioned in the cylindrical groove.
3. The electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to claim 1, wherein the cross section of each circular arc vibration plate is an arc with fixed curvature, the arc rotates along the axis of the central shaft to form the circular arc vibration plates, the number of the circular arc vibration plates is 8-16, a plurality of the circular arc vibration plates are circumferentially distributed along the central shaft to form a concave kidney-shaped cylinder, and vibration plate slits are formed between the adjacent circular arc vibration plates.
4. The electromagnetic low frequency bend Zhang Shanji subsonic logging transmitting transducer of claim 1, wherein the end of the driving cap extending into the magnetic gap is provided with a groove on the outer wall thereof, a spiral line is carved in the groove, the coil is wound in the groove according to the spiral line, and the midpoint of the coil in the height direction thereof and the midpoint of the soft iron bottom in the thickness direction thereof are on the same level.
5. The electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer according to claim 1, wherein two wiring holes penetrating through the outer wall of the central shaft tube are formed in the outer wall of the central shaft tube, and wires of the coil enter the central shaft tube through the two wiring holes and are connected with an external circuit.
6. The electromagnetic low frequency bend Zhang Shanji subsonic logging transmitting transducer of claim 2, wherein an end face of the soft iron cover facing away from the cylindrical slot abuts a gland comprising:
the lower gland is annular and sleeved on the periphery of the middle shaft tube and is used for propping against the soft iron cover, and the outer diameter of the lower gland is smaller than that of the soft iron cover;
the upper gland is cylindrical, sleeved on the periphery of the middle shaft tube and fixedly connected with the lower gland, the lower gland is fixedly arranged on the middle shaft tube, a limit groove is formed in the inner wall of the upper gland, and the limit groove surrounds the inner wall of the upper gland for a circle and is used for positioning the position of the gland on the middle shaft tube;
the gland is matched with the protruding platform, and the soft iron cover, the permanent magnet, the soft iron bottom and the gasket are fixedly pressed on the middle shaft tube.
7. The electromagnetic low frequency bend Zhang Shanji subsonic logging transmitting transducer of any one of claims 1-6, wherein said actuation cap material is a non-conductive, high temperature resistant material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211029763.XA CN115680637B (en) | 2022-08-25 | 2022-08-25 | Electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211029763.XA CN115680637B (en) | 2022-08-25 | 2022-08-25 | Electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115680637A CN115680637A (en) | 2023-02-03 |
| CN115680637B true CN115680637B (en) | 2023-05-12 |
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| CN202211029763.XA Active CN115680637B (en) | 2022-08-25 | 2022-08-25 | Electromagnetic low-frequency bending Zhang Shanji sub-acoustic logging transmitting transducer |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4682308A (en) * | 1984-05-04 | 1987-07-21 | Exxon Production Research Company | Rod-type multipole source for acoustic well logging |
| US4685091A (en) * | 1984-05-10 | 1987-08-04 | Exxon Production Research Co. | Method and apparatus for acoustic well logging |
| FR2668836B1 (en) * | 1990-11-06 | 1993-04-30 | Schlumberger Services Petrol | ACOUSTIC WELL TRANSDUCER. |
| JP2000334377A (en) * | 2000-01-01 | 2000-12-05 | Tokin Corp | Electric vibration converter |
| US7462960B2 (en) * | 2004-01-05 | 2008-12-09 | The Hong Kong Polytechnic University | Driver for an ultrasonic transducer and an ultrasonic transducer |
| CN101526503B (en) * | 2009-02-19 | 2011-01-26 | 钢铁研究总院 | Magnetostrictive transducer used for sound wave nondestructive examination |
| CN106807615B (en) * | 2017-01-18 | 2019-05-28 | 清华大学 | Magnetostriction longitudinal-torsional composite ultrasonic vibration transducer |
| CN107859515A (en) * | 2017-09-13 | 2018-03-30 | 杭州瑞利声电技术公司 | A kind of acoustic logging transmitter unit |
| IT201900004215A1 (en) * | 2019-03-22 | 2020-09-22 | Eni Spa | ELECTRO-ACOUSTIC TRANSDUCER. |
| CN113301478A (en) * | 2021-05-16 | 2021-08-24 | 西北工业大学 | Reinforced concave cylinder type flextensional transducer structure and method |
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