CN115680637A - Electromagnetic low-frequency bent monopole acoustic logging transmitting transducer - Google Patents
Electromagnetic low-frequency bent monopole acoustic logging transmitting transducer Download PDFInfo
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- CN115680637A CN115680637A CN202211029763.XA CN202211029763A CN115680637A CN 115680637 A CN115680637 A CN 115680637A CN 202211029763 A CN202211029763 A CN 202211029763A CN 115680637 A CN115680637 A CN 115680637A
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Abstract
The application discloses bent monopole sound logging emission transducer that opens of electromagnetic type low frequency includes: a central shaft tube; the soft iron cover is fixedly sleeved on the periphery of the central shaft tube and is provided with a cylindrical groove; the permanent magnet is fixedly sleeved on the periphery of the central shaft tube, is positioned in the cylindrical groove and is abutted against the bottom surface of the cylindrical groove; the soft iron bottom is fixedly sleeved on the periphery of the central shaft tube and abuts against the end face of the permanent magnet; the driving cover is fixedly sleeved on the periphery of the central shaft tube, the end part of the driving cover, facing the soft iron cover, extends into the magnetic gap, and a coil is wound on the outer wall of the end part of the driving cover, extending into the magnetic gap; the vibrating body is fixedly sleeved on the periphery of the central 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 vibrating pieces are arranged between the upper connecting ring and the lower connecting ring; the electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer arranged in the mode can meet the excitation of a low-frequency sound source in a small-size environment and the aim of remote detection of acoustic waves.
Description
Technical Field
The application relates to the technical field of acoustic logging, in particular to an electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer.
Background
The attenuation of the acoustic wave in the formation is frequency dependent, with lower frequencies, slower attenuation, and greater detection distances. 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 transmitting frequency of the transducer, however, a logging instrument needs to work in a small-size environment underground, and therefore the piezoelectric monopole sound source is not beneficial to remote detection. Although a flextensional transducer driven by a common magnetostrictive material can generate a low-frequency sound source and has the characteristics of large strain displacement, high energy density and the like, the magnetostrictive material is sensitive to temperature change, and the efficiency of the magnetostrictive material in a high-temperature and high-pressure underground environment can be greatly reduced.
Therefore, how to design an electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer which can satisfy the excitation of a low-frequency sound source in a small-size environment and satisfy the remote detection of sound waves is a technical problem to be solved by technical personnel in the field.
Disclosure of Invention
The purpose of this application is to provide a bent monopole sound wave logging emission transducer of electromagnetic type low frequency overcomes the problem that can not produce the low frequency sound source in high temperature high pressure and the small-size environment in the pit among the prior art, and this bent monopole sound wave logging emission transducer of electromagnetic type low frequency can enough satisfy the small-size requirement in the pit, can produce the low frequency sound source again, satisfies the long-range detection demand around the well hole.
In order to achieve the above object, the present application provides an electromagnetic low-frequency flextensional monopole sonic logging transmitting transducer, including:
a central shaft 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 central shaft tube, is positioned in the cylindrical groove and abuts against the bottom surface of the cylindrical groove;
the soft iron bottom is fixedly sleeved on the periphery of the central shaft tube and is abutted against the end face of the permanent magnet, which is deviated 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, facing the soft iron cover, extends into the magnetic gap, the driving cover and the permanent magnet are arranged at intervals with the soft iron bottom and the soft iron cover, a coil is wound on the outer wall of the end part of the driving cover, extending into the magnetic gap, and the coil is positioned in a constant magnetic field generated by the permanent magnet;
the pendulum, fixed cover is located the well central siphon periphery, and with the drive lid deviates from the tip fixed connection of coil, include with last go-between that the drive lid is connected and with well central siphon fixed connection's lower go-between, go up the go-between with be provided with a plurality of circular arcs between the go-between down and shake the piece, just the circular arc shake the piece with well central siphon outer wall interval sets up.
Preferably, the permanent magnet and the soft iron bottom are annular, the inner diameter and the outer diameter of the permanent magnet and the outer diameter of the soft iron bottom 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.
Preferably, the section of the circular arc vibration piece is an arc line with a specific curvature, the arc line rotates along the axis of the central shaft tube to form the circular arc vibration piece, the number of the circular arc vibration pieces is 8-16, the circular arc vibration pieces are distributed along the circumferential direction of the central shaft tube to form a concave waist-shaped cylinder, and a vibration piece cutting seam is arranged between every two adjacent circular arc vibration pieces.
Preferably, a groove is formed in the outer wall of the end portion of the driving cover extending into the magnetic gap, a spiral line is carved in the groove, the coil is wound in the groove according to the spiral line, and the middle point of the coil in the height direction and the middle point of the soft iron bottom in the thickness direction are on the same horizontal plane.
Preferably, the outer wall of the middle shaft tube is provided with two wire holes penetrating through the middle shaft tube, and a lead of the coil enters the middle shaft tube through the two wire holes and is connected with an external circuit.
Preferably, the central axis pipe is of a hollow tubular structure, a protruding platform is arranged on the outer wall of the central axis pipe, 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 soft iron bottom.
Preferably, the end face of the soft iron cover, which faces away from the cylindrical groove, supports a gland, and the gland comprises:
the lower gland is annular, is sleeved on the periphery of the central shaft tube and is used for abutting 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, is sleeved on the periphery of the central shaft tube and is fixedly connected with the lower gland, the lower gland is fixedly arranged on the central shaft tube, a limiting groove is arranged on the inner wall of the upper gland, and the limiting groove surrounds the inner wall of the gland for a circle and is used for positioning the position of the gland on the central shaft tube;
the gland is matched with the protruding platform to fixedly press the soft iron cover, the permanent magnet, the soft iron bottom and the gasket on the central 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 is sleeved on the periphery of the central 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 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 central shaft tube, and is fixedly arranged on the central shaft tube.
Preferably, the outer wall of the middle shaft tube is provided with a plurality of round-angle rectangular grooves along the circumferential direction, the round-angle rectangular grooves at the same axial position form a round-angle rectangular groove group, the side wall of the middle shaft tube is provided with 3 round-angle rectangular groove groups at intervals along the axial direction, the round-angle rectangular grooves are axially staggered, the positions where the round-angle rectangular grooves are formed correspond to the circular-arc vibration pieces, and the round-angle rectangular grooves are matched with the fan-shaped through grooves for use and used for guiding the fluid inside the circular-arc vibration pieces and discharging the internal energy.
Preferably, the driving cap material is a non-conductive high temperature resistant material.
Compared with the background technology, in the electromagnetic low-frequency bent monopole acoustic logging transmitting transducer, the soft iron cover, the permanent magnet and the soft iron bottom form a magnetic circuit structure, the magnetic circuit structure is fixedly arranged on the central axis tube, two end faces of the permanent magnet respectively abut against the soft iron cover and the soft iron bottom, the soft iron bottom is padded with a gasket to prevent the permanent magnet and the soft iron bottom from cracking in the vibration process, a constant magnetic field generated by the permanent magnet is converged in a magnetic gap through the conduction of the soft iron cover and the soft iron bottom, and the utilization rate of the magnetic field is ensured.
In addition, in the electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer, the vibrating body comprises an upper connecting ring, a lower connecting ring and an arc vibrating sheet, the driving cover is fixed with the vibrating body, the vibrating body is fixedly connected with the central 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 arc vibrating sheet vibrates, low-frequency acoustic waves are radiated to the periphery, the excitation of a low-frequency acoustic source in a small-size environment can be met, and the requirement of acoustic remote detection 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 needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic external structural diagram of an electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to an embodiment of the present application;
FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic diagram of a central shaft tube structure of an electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to an embodiment of the present application;
fig. 4 is a schematic diagram of a gland three-dimensional structure of an electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to an embodiment of the present application;
fig. 5 is a schematic view of a cross-sectional structure of a gland of an electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to an embodiment of the present application;
fig. 6 is a schematic cross-sectional view of a soft iron cover of an electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to an embodiment of the present application;
fig. 7 is a schematic perspective view of a permanent magnet of an electromagnetic low-frequency flextensional monopole sonic logging transmitting transducer according to an embodiment of the present application;
fig. 8 is a schematic diagram of a soft iron bottom three-dimensional structure of an electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to an embodiment of the present application;
fig. 9 is a schematic diagram of a storefront three-dimensional structure of an electromagnetic low-frequency flextensional monopole sonic logging transmitting transducer provided by an embodiment of the present application;
fig. 10 is a schematic perspective view of a driving cover of an electromagnetic low-frequency flextensional monopole sonic logging transmitting transducer according to an embodiment of the present application;
fig. 11 is a schematic cross-sectional view illustrating a driving cover of an electromagnetic low-frequency flextensional monopole sonic logging transmitting transducer according to an embodiment of the present disclosure;
fig. 12 is a schematic perspective view of a vibrating body of an electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to an embodiment of the present application;
fig. 13 is a schematic perspective view of a base of an electromagnetic low-frequency flextensional monopole sonic 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 round-corner rectangular groove;
2. the pressing cover 21, the upper pressing cover 22, the lower pressing cover 23 and the limiting 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. the vibrating body 81, the upper connecting ring 82, the arc vibrating piece 83, the lower connecting ring 84 and the vibrating piece are slotted;
9. base 91, upper base 92, lower base 93, fan-shaped through slot.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In order to enable those skilled in the art to better understand the scheme of the present application, the present application will be described in further detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1 to 13, in this embodiment, an electromagnetic low-frequency bent monopole acoustic logging transmitting transducer is provided, which includes a central axis tube 1, a soft iron cover 3, a permanent magnet 4, a soft iron bottom 5, a driving cover 7 and a vibrating body 8, where 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 disposed on the central axis 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 central axis tube 1, and a cylindrical groove 31 coaxial with the central axis tube 1 is disposed on the soft iron cover 3; the permanent magnet 4 is fixedly sleeved on the periphery of the central shaft tube 1, is positioned in the cylindrical groove 31 and abuts against the bottom surface of the cylindrical groove 31; the periphery of the central shaft tube 1 is fixedly sleeved with the soft iron bottom 5, the soft iron bottom 5 is abutted against the end face of the permanent magnet 4 deviating from the bottom surface of the cylindrical groove 31, the permanent magnet 4 and the soft iron bottom 5 are arranged at intervals with the inner wall of the cylindrical groove 31 to form an annular magnetic gap, and a constant magnetic field generated by the permanent magnet 4 is converged in the magnetic gap through the conduction of the soft iron cover 3 and the soft iron bottom 5, so that the utilization rate of the magnetic field is ensured.
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 fixed with the vibrating body 8, the vibrating body 8 is fixedly connected with the central shaft tube 1, the coil 71 on the driving cover 7 is located in a magnetic gap magnetic field, and 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, low-frequency sound waves are radiated to the periphery, excitation of low-frequency sound sources in small-size environments can be met, and the requirement of long-distance detection of the sound waves is met.
It should be noted that, the driving cover 7 is fixedly sleeved on the periphery of the central axis tube 1 and is arranged at an interval with the outer wall of the central axis tube 1, the end of the driving cover 7 facing the soft iron cover 3 extends into the magnetic gap, and is arranged at an interval with the permanent magnet 4, the soft iron bottom 5 and the soft iron cover 3, the coil 71 is wound on the outer wall of the end of the driving cover 7 extending into the magnetic gap, and the coil 71 is located in the 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 is fixedly connected with the end of the driving cover 7 away from the coil 71, and includes 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 spaced from the outer wall of the bottom bracket tube 1.
In the embodiment, the bottom tube 1, the magnetic structure, the driving cover 7 and the vibrating body 8 which are made of metal materials jointly form an electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer, the magnetic structure converges a magnetic field generated by the permanent magnet 4 in an annular magnetic gap through the soft iron cover 3 and the soft iron bottom 5, the coil 71 on the driving cover 7 is located in the magnetic field, the driving cover 7 is fixed with the vibrating body 8, the bottom of the vibrating body 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 flextensional monopole acoustic logging transmitting transducer arranged in the above manner is small in size and high in transmitting sound pressure level, can meet the requirement of acoustic logging on a low-frequency sound source, and is favorable for popularization and application.
As shown in fig. 6, 7, and 8, in this embodiment, the permanent magnet and the soft iron bottom 5 are annular, the inner and outer diameters of the permanent magnet 4 and the soft iron bottom 5 are the same, and the end surface of the soft iron cover 3 exceeds the end surface of the soft iron bottom 5, that is, the permanent magnet 4 and the soft iron bottom 5 are both located inside the cylindrical groove 31.
It should be noted that, 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 an annular magnetic gap, and the soft iron cover 3 and the soft iron bottom 5 converge the magnetic force lines generated by the permanent magnet 4 into the magnetic gap, so that the magnetic gap has a strong magnetic flux density and provides a sufficient driving force for the vibration of the vibrating body 8.
In the embodiment, the soft iron cover 3 is in a cover-shaped structure, can cover the permanent magnet 4 and the soft iron bottom 5, has a distance of not less than 2.5mm from the upper end of the vibrating body 8, and has an outer diameter of not more than 72mm.
Further, as shown in fig. 4 and 5, an 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 is sleeved on the periphery of the central shaft tube 1 and used for abutting 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 central axis tube 1, and is fixedly connected with the lower gland 22, and the lower gland 22 is fixedly arranged on the central axis tube 1, of course, the specific fixing mode can be bolt fixing, and other fixing modes can also be adopted, which are not described in detail herein; the inner wall of the upper gland 21 is provided with a limiting groove 23, and the limiting 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 central shaft tube 1.
As shown in fig. 2 and 3, the bottom bracket tube 1 is a hollow tubular structure, a protruding platform 11 is disposed on an outer wall thereof, a gasket 6 is clamped between the protruding platform 11 and the soft iron bottom 5, and inner and outer diameters of the gasket 6, the permanent magnet 4 and the soft iron bottom 5 are the same.
In this embodiment, as shown in fig. 7, 8, and 9, the permanent magnet 4, the soft iron bottom 5, and the spacer 6 have the same structure and are all circular, the inner and outer diameters of the permanent magnet 4, the soft iron bottom 5, and the spacer 6 are kept the same, the height of the permanent magnet 4 is 10mm, the height of the soft iron bottom 5 is 8mm, and the height of the spacer 6 is 3mm.
As shown in fig. 2, it should be noted that the pressing cover 2 is matched with the protruding platform 11 to fix and press 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 cap 7 is divided into two parts, the upper part and the lower part are smoothly connected, the upper part of the driving cap 7 is located in the magnetic gap, a groove with a depth of 0.2mm and a height of 10mm is engraved on the outer wall of the upper part of the driving cap 7, a spiral thread is engraved in the groove, the coil 71 is wound in the groove according to the spiral thread, and in the present embodiment, the thickness of the upper part of the driving cap 7 is not more than 1.5mm; further, as shown in fig. 2, the middle point of the coil 71 in the height direction thereof and the middle point of the soft iron bottom 5 in the thickness direction thereof are on the same horizontal plane.
In this embodiment, as shown in fig. 12, the cross section of the circular-arc vibrating plate 82 is an arc line with a specific curvature, the resonance frequency can be adjusted by changing the curvature, the arc line rotates along the axis of the bottom bracket tube 1 to form the circular-arc vibrating plates 82, the number of the circular-arc vibrating plates 82 is 8-16, and the circular-arc vibrating plates 82 are circumferentially distributed along the bottom bracket tube 1 to form a circular cylinder with a concave waist shape, and a vibrating plate slit 84 is arranged between adjacent circular-arc vibrating plates 82.
Specifically, the arc-shaped vibrating piece is subjected to linear cutting processing, the arc-shaped vibrating piece is cut into 8 pieces with the same size, and the upper connecting ring 81 and the lower connecting ring 83 are respectively provided with 8 bolt holes which are uniformly distributed on the circumference and respectively correspond to the bolt holes on the driving cover 7 and the base 9; of course, other fixing methods can be adopted to ensure that the vibrating body 8 is stably connected with the base 9 and the vibrating body 8 is stably connected with the driving cover 7, in the above embodiment, the width of the vibrating piece cutting seam 84 is 1.5mm, and the included angle between adjacent cutting seams is 45 °.
In addition, when the driving cover 7 is fixed with the vibrator 8, the upper surface of the upper connection ring 81 may be in the same plane as the upper surface of the lower portion of the driving cover 7, and the height of the upper connection ring 81 is slightly greater than the height of the lower portion of the driving cover 7; when the vibrating body 8 is fixed with the base 9, the lower connecting ring 83 is fixed with the upper base 91, the lower surface of the lower connecting ring 83 and the lower surface of the upper base 91 are located on the same plane, and the height of the lower connecting ring 83 is slightly larger than that of the upper base 91.
As shown in FIG. 3, the bottom bracket tube 1 has two wire holes 12 formed through the bottom bracket tube 1, and the conductive wire of the coil 71 enters the bottom bracket tube 1 through the two wire holes 12 and is connected to an external circuit.
As shown in FIGS. 12 and 13, the lower connecting ring 83 is fixedly connected to the bottom bracket tube 1 via the bottom bracket 9, and the bottom bracket 9 includes: the upper base 91 is annular and is sleeved on the periphery of the central shaft tube 1, a fan-shaped through groove 93 penetrating through the upper base is formed in the end face of the upper base, and the outer wall of the upper base 91 is abutted against the inner wall of the lower connecting ring 83 and is fixedly connected with the inner wall; the lower base 92 is cylindrical, is fixedly connected with the upper base 91, and is sleeved on the periphery of the central axis tube 1, and is fixedly arranged on the central axis tube 1, and a threaded hole can be formed in the lower base 92 in a specific fixing mode, and is fixedly connected with the central axis tube 1 through a bolt, of course, other modes can be adopted for fixing, and detailed description is omitted here.
It should be noted that, as shown in fig. 3, a plurality of fillet rectangular grooves 13 have been seted up along its circumference to the outer wall of central siphon 1, the fillet rectangular groove 13 of the same axial position department constitutes fillet rectangular groove group, set up 3 fillet rectangular groove groups along axial interval on the lateral wall of central siphon 1, a plurality of fillet rectangular grooves 13 are the crisscross setting of axial, the position of seting up of fillet rectangular groove 13 corresponds with circular arc vibration piece 82, and fillet rectangular groove 13 and fan-shaped through groove 93 cooperate and use, be used for the inboard fluid water conservancy diversion of circular arc vibration piece 82, internal energy of releasing.
In the above embodiment, the material of the driving cover 7 is a non-conductive high temperature resistant material, such as polyetheretherketone.
It should be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The principles and embodiments of the present application are described herein using specific examples, which are only used to help understand the method and its core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, the present application can also make several improvements and modifications, and those improvements and modifications also fall into the protection scope of the claims of the present application.
Claims (10)
1. An electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer, which is characterized by comprising:
a central shaft 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 central shaft tube, is positioned in the cylindrical groove and abuts against the bottom surface of the cylindrical groove;
the soft iron bottom is fixedly sleeved on the periphery of the central shaft tube and abuts against the end face of the permanent magnet, which deviates 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, facing the soft iron cover, extends into the magnetic gap, the driving cover, facing the permanent magnet, the soft iron bottom and the soft iron cover are arranged at intervals, a coil is wound on the outer wall of the end part of the driving cover, extending into the magnetic gap, and the coil is positioned in a constant magnetic field generated by the permanent magnet;
the pendulum, fixed cover is located the central siphon periphery, and with the drive lid deviates from the tip fixed connection of coil, include with last go-between that the drive lid is connected and with central siphon fixed connection's lower go-between, go up the go-between with be provided with a plurality of circular arcs between the go-between down and shake the piece, just the circular arc shake the piece with the central siphon outer wall interval sets up.
2. The electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to claim 1, wherein said permanent magnet and said soft iron bottom are circular, and the inner and outer diameters of said permanent magnet and said soft iron bottom are the same, and the end surface of said soft iron cover exceeds the bottom surface of said soft iron, i.e. said permanent magnet and said soft iron bottom are both located in said cylindrical groove.
3. The electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to claim 1, wherein the section of said circular-arc vibrating plate is an arc line with a fixed curvature, and said arc line rotates along the axis of said central shaft tube to form said circular-arc vibrating plate, the number of said circular-arc vibrating plates is 8-16, and a plurality of said circular-arc vibrating plates are circumferentially distributed along said central shaft tube to form a concave waist-shaped cylinder, and a vibrating plate cutting seam is arranged between adjacent circular-arc vibrating plates.
4. The electromagnetic low-frequency flextensional monopole sonic logging transmitting transducer according to claim 1, wherein a groove is arranged on the outer wall of the end part of the driving cover extending into the magnetic gap, a spiral line is engraved in the groove, the coil is wound in the groove according to the spiral line, and the middle point of the coil in the height direction and the middle point of the soft iron bottom in the thickness direction are on the same horizontal plane.
5. The electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to claim 1, wherein two wire-passing holes running through the outer wall of the central shaft tube are arranged on the outer wall of the central shaft tube, and the conducting wire of the coil enters the central shaft tube through the two wire-passing holes and is connected with an external circuit.
6. The electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to claim 2, wherein the central shaft tube is of a hollow tubular structure, a protruding platform is arranged on the outer wall of the central 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 soft iron bottom.
7. The electromagnetic low frequency flextensional monopole sonic logging transmitting transducer of claim 6, wherein the end surface of said soft iron cap facing away from said cylindrical groove bears a gland comprising:
the lower gland is annular, is sleeved on the periphery of the central shaft tube and is used for abutting 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, is sleeved on the periphery of the central shaft tube and is fixedly connected with the lower gland, the lower gland is fixedly arranged on the central shaft tube, a limiting groove is arranged on the inner wall of the upper gland, and the limiting groove surrounds the inner wall of the upper gland for a circle and is used for positioning the position of the gland on the central shaft tube;
the gland is matched with the protruding platform to fixedly press the soft iron cover, the permanent magnet, the soft iron bottom and the gasket on the central shaft tube.
8. The electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to claim 1, wherein said lower connecting ring is fixedly connected with said central shaft tube by a base, said base comprising:
the upper base is annular and is sleeved on the periphery of the central shaft tube, a fan-shaped through groove penetrating through the upper base is formed in the end face of the upper base, and the outer wall of the upper base abuts against the inner wall of the lower connecting ring and is 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 central axis tube, and is fixedly arranged on the central axis tube.
9. The electromagnetic low-frequency flextensional monopole acoustic logging transmitting transducer according to claim 8, wherein a plurality of round-angle rectangular grooves are formed in the outer wall of the central shaft tube along the circumferential direction thereof, the round-angle rectangular grooves at the same axial position form a round-angle rectangular groove group, 3 round-angle rectangular groove groups are axially arranged on the side wall of the central shaft tube at intervals, the round-angle rectangular grooves are axially staggered, the round-angle rectangular grooves are formed at positions corresponding to the circular-arc vibrating pieces, and the round-angle rectangular grooves are matched with the fan-shaped through grooves for use and are used for guiding fluid inside the circular-arc vibrating pieces and discharging internal energy.
10. The electromagnetic low frequency flextensional monopole acoustic logging transmission transducer of any of claims 1-9, wherein said drive 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)
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| 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 |
| CN113301478A (en) * | 2021-05-16 | 2021-08-24 | 西北工业大学 | Reinforced concave cylinder type flextensional transducer structure and method |
| CN113678026A (en) * | 2019-03-22 | 2021-11-19 | 埃尼股份公司 | Electroacoustic transducer |
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| 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 |
| US5477101A (en) * | 1990-11-06 | 1995-12-19 | Schlumberger Technology Corporation | Downhole acoustic transducer |
| JP2000334377A (en) * | 2000-01-01 | 2000-12-05 | Tokin Corp | Electric vibration converter |
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| CN106807615A (en) * | 2017-01-18 | 2017-06-09 | 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 |
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| CN115680637B (en) | 2023-05-12 |
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