CN114991754B - Transducer device and scanning device using same - Google Patents

Abstract

The present invention relates to a transducer device and a scanning device using the same. The transducer device comprises: a device housing, a housing cavity is formed inside the device housing, and the device housing comprises a first part and a second part sealed and fixedly connected to the first part. The wall surface of the first part is provided with: an oil filling hole connected to the housing cavity, a buffer assembly and a connector; the second part is formed with a transmitting and receiving window; and a transducer body is arranged in the housing cavity. The transducer body comprises a transmitting and receiving end, which is arranged toward the transmitting and receiving window and is sealed and fixed in the second part, and the transducer body is electrically connected to the connector. The oil filling hole is used to input hydraulic medium into the housing cavity, the buffer assembly is used to balance the pressure difference between the housing cavity and the external environment, and the connector is used to communicate and/or power supply with the outside. The transducer device of the present invention can improve the convenience of transducer replacement and improve its scope of application.

Description

A transducer device and a scanning device using the same

Technical Field

The invention belongs to the technical field of oil and gas well quality detection, and in particular relates to a transducer device and a scanning device using the same.

Background Art

After the oil and gas wells are built, the casing corrosion and cement cementing quality need to be tested to understand the integrity of the wellbore and ensure the safety of the wellbore. Ultrasonic scanning imaging logging technology can detect the inner diameter, wall thickness and cement quality of the casing at the same time in one trip, and it covers the entire wellbore at 360°. It can effectively detect corrosion perforation on the casing and cement ring channeling. It is a very advanced technology. The core equipment of this technology is the ultrasonic transducer.

In the prior art, when using transducers for wellbore integrity detection, the following problems often exist: 1) In order to adapt to casings of different sizes, the scanning device often needs to be designed with different outer diameters. In the existing structure, the transducer is usually directly installed in the scanning device, and the scanning device is filled with hydraulic oil, and then hydraulically balanced with the mud outside the wellbore through a hydraulic balance system. The defects of this structure are that when the transducer needs to be replaced, multiple steps such as draining oil, disassembling and replacing the transducer, and filling oil must be performed, which makes the replacement of the transducer extremely inconvenient and reduces the operation time efficiency; 2) For a specific casing, a transducer with a specific frequency needs to be selected in advance, which leads to a large number of types and quantities of transducers, thereby increasing the operation cost and reducing the applicability of the scanning device; 3) With the deepening of exploration and development, the number of high-temperature wells greater than 175°C has gradually increased, while the temperature resistance of existing transducers generally does not exceed 175°C, which limits the application scope of the scanning device and cannot meet the exploration and development requirements of high-temperature and high-pressure wells; 4) Due to sensitivity limitations, the commonly used transducers can generally only be used for water-based muds with a density of 1.9g/ ^cm3 or less. If it is oil-based mud, the application range is narrower (the density cannot be greater than 1.4g/ ^cm3 ), so it cannot better adapt to the detection needs under various environments.

Summary of the invention

In order to solve all or part of the above problems, the present invention aims to provide a transducer device and a scanning device using the same, so as to improve the convenience of transducer replacement and expand its scope of application.

According to the first aspect of the present invention, there is provided a transducer device, comprising: a device housing, a housing cavity is formed inside the device housing, the device housing comprises a first part and a second part sealed and fixedly connected to the first part, wherein the wall surface of the first part is provided with: an oil filling hole connected to the housing cavity, a buffer assembly and a connector; a transmitting and receiving window is formed on the second part; and a transducer body is arranged in the housing cavity, the transducer body comprises a transmitting and receiving end, the transmitting and receiving end is arranged toward the transmitting and receiving window and is sealed and fixed in the second part, and the transducer body is electrically connected to the connector. The oil filling hole is used to input hydraulic medium into the housing cavity; the buffer assembly is used to balance the pressure difference between the housing cavity and the external environment; the connector is used to communicate and/or power supply with the outside.

In some embodiments, the interior of the second part is configured as an installation cavity that matches the outer peripheral wall of the transmitting and receiving ends, wherein an annular groove is formed on the inner peripheral wall of the installation cavity, and a sealing ring is installed in the annular groove, forming a sealed connection between the sealing ring and the outer peripheral wall of the transducer body.

In some embodiments, a retaining ring is fixed at a position of the mounting cavity close to the transmitting and receiving window, and the retaining ring is used to limit the transducer body in the axial direction.

In some embodiments, the buffer assembly includes: a buffer chamber, which is configured as a circular channel, the circular channel is formed on the wall surface of the accommodating chamber located in the first part, and the circular channel is used to connect the accommodating chamber with the external environment; a piston assembly, which is sealed in the circular channel, and the piston assembly is configured to slide axially relative to the circular channel.

In some embodiments, the transducer body includes: a transducer housing, one end of which is sealed and fixedly connected to the second part, and the other end is arranged in the accommodating cavity, and an opening is formed on the side of the transducer housing facing the transmitting and receiving window; a crystal assembly, which is arranged in the transducer housing and close to the opening, the crystal assembly is electrically connected to the connector through a wire, and the transmission surface of the crystal assembly is arranged to be parallel to the plane where the opening is located; a matching layer, which is arranged in the opening, and the matching layer is attached to the transmission surface of the crystal assembly; a backing, which is filled in the transducer housing, and the backing is attached to the side of the crystal assembly opposite to the matching layer, and the matching layer and the backing are used to fix the crystal assembly to the transducer housing.

In some embodiments, the crystal assembly includes a plurality of crystals, and the material of the crystals is piezoelectric material.

In some embodiments, the crystal assembly further comprises a composite layer for fixing the plurality of crystals, wherein the composite layer is constructed as an epoxy resin layer.

In some embodiments, the piezoelectric material is a piezoelectric ceramic, and the crystal structure is: a plurality of columnar piezoelectric ceramics are arranged in a non-periodic and uniform manner.

In some embodiments, the material of the matching layer is epoxy material, and the material of the transducer housing is polyetheretherketone. According to a second aspect of the present invention, a scanning device is provided, comprising: an instrument housing; a motor, which is arranged inside the instrument housing; a transmission shaft, one end of which is connected to the motor and the other end extends outside the instrument housing; and a transducer device provided according to the first aspect of the present invention. The transducer device is arranged outside the instrument housing, and the transducer device is detachably connected to the end of the transmission shaft.

The transducer device of the present invention has the following advantages:

1) The transducer device of the present invention can be separated from the internal hydraulic system of the scanning device to which it is applied, so that the transducer device of the embodiment of the present invention can be constructed as an independent device for use, thereby not only enabling the transducer device of the embodiment of the present invention to automatically adapt to the change of downhole pressure, but also enabling the rapid replacement of the transducer device, thereby improving the operation time efficiency and reducing the operation cost;

2) The shape and size of the transducer body of the transducer device of the present invention can be determined in combination with the shape and size of the casing to be detected, and the shape and size of the required crystal assembly can be further determined to obtain an excitation signal and waveform component that is more suitable for the casing to be detected, so that the transducer body can obtain a higher echo signal;

3) The transducer body of the transducer device of the present invention is encapsulated with high-temperature resistant epoxy resin and high-temperature resistant engineering plastic polyetheretherketone, which can enable the transducer body to work stably and reliably at about 205°C. At the same time, it can also enable the transducer body to have insulation and good mechanical strength, thereby effectively ensuring the performance of the transducer device.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of some embodiments of the transducer device according to the embodiment of the present invention;

FIG2 is an exploded schematic diagram of the structure of the transducer device shown in FIG1 ;

FIG3 is a schematic cross-sectional view of the transducer device shown in FIG1 ;

FIG4 is a schematic structural diagram of the transducer body shown in FIG3 ;

FIG5 is a schematic diagram of the structure of some embodiments of the scanning device according to the embodiment of the present invention;

FIG. 6 is a schematic diagram of a scanning device in use according to an embodiment of the present invention.

DETAILED DESCRIPTION

In order to better understand the purpose, structure and function of the present invention, a transducer device of the present invention is further described in detail below with reference to the accompanying drawings.

FIG1 is a schematic diagram of the overall structure of some embodiments of the transducer device 100 of the embodiment of the present invention; FIG2 is an exploded schematic diagram of the structure of the transducer device 100 shown in FIG1; and FIG3 is a schematic diagram of the cross-sectional structure of the transducer device 100 shown in FIG1. In combination with FIG1 to FIG3, the transducer device 100 comprises: a device housing 1, in which a housing cavity 13 is formed, the device housing 1 comprises a first part 11 and a second part 12 sealed and fixedly connected to the first part 11, wherein the wall surface of the first part 11 is provided with: an oil injection hole 14 connected to the housing cavity 13, a buffer assembly 15 and a connector 16; the second part 12 is formed with a transmitting and receiving window 121; and a transducer body 2, which is arranged in the housing cavity 13, the transducer body 2 comprises a transmitting and receiving end 21, the transmitting and receiving end 21 is arranged toward the transmitting and receiving window 121 and is sealed and fixed in the second part 12, and the transducer body 2 is electrically connected to the connector 16. The oil injection hole 14 is used to input hydraulic medium into the housing cavity 13. The buffer assembly 15 is used to balance the pressure difference between the accommodating cavity 13 and the external environment. The connector 16 is used to communicate with the outside and/or connect the power supply.

The device housing 1 mentioned in the present application may be a metal shell. The first part 11 and the second part 12 mentioned in the present application may be connected by fasteners such as screws. When connected, a sealing ring may be installed at the fitting surface of the two for sealing after the two are connected. The transducer body 2 in the present application is fixed in the device housing 1 for use. The transducer body 2 transmits ultrasound and receives echoes through the transmitting and receiving window 121. Combined with the above description, it can be seen that the oil filling hole 14 is used to input hydraulic medium into the accommodating cavity 13, the buffer assembly 15 is used to balance the pressure difference between the accommodating cavity 13 and the external environment, and the connector 16 is used to communicate and/or power supply with the outside. When the transducer device 100 of the embodiment of the present invention is used in specific use, after the transducer body 2 is fixed, a filling cavity of hydraulic medium is formed between the transducer body 2 and the first part 11, and oil is injected into the filling cavity through the oil filling hole 14. Under high temperature and high pressure conditions underground, the buffer assembly 15 balances the internal and external pressures. In this embodiment, the buffer stroke of the buffer assembly 15 can be set so that the transducer device 100 can maintain the hydraulic oil pressure in the accommodating cavity 13 consistent with the wellbore mud pressure through the buffer assembly 15 under high temperature and high pressure environment, so that the transducer device 100 can always maintain normal operation.

Through the above arrangement, the transducer device 100 of the embodiment of the present invention is mainly composed of a transducer body 2 and a device housing 1 with a housing 13 filled with hydraulic oil. The interior of the transducer device 100 is filled with hydraulic oil, and the internal and external pressures can be balanced through the buffer assembly 15, which can be separated from the internal hydraulic system of the scanning device 200 to which it is applied, so that the transducer device 100 of the embodiment of the present invention can be constructed as an independent device for use, so that the transducer device 100 of the embodiment of the present invention can automatically adapt to the change of downhole pressure, and can also realize the rapid disassembly and installation of the transducer device 100, thereby improving the replacement efficiency and the operation timeliness.

Please refer to FIG. 3 . In some embodiments, the interior of the second part 12 can be configured as an installation cavity that matches the outer peripheral wall of the transmitting and receiving end 21. An annular groove 122 is formed on the inner peripheral wall of the installation cavity, and a sealing ring 123 is installed in the annular groove 122. The sealing ring 123 forms a sealed connection with the outer peripheral wall of the transducer body 2. With this arrangement, the transducer body 2 can be sealed and installed only through the sealing ring 123, thereby making the entire assembly process of the transducer body 2, which is the core component of the transducer device 100 of the embodiment of the present invention, simpler and more convenient, and improving the installation efficiency of the transducer body 2. In addition, in order to meet different detection requirements, the above arrangement is also more convenient and quick for the replacement of the transducer body 2.

2 and 3, in some embodiments, a retaining ring 124 may be fixed at a position of the mounting cavity near the transmitting and receiving window 121, and the retaining ring 124 may be used to limit the transducer body 2 in the axial direction. The overall structure of the transducer device 100 of the present application is simple, which not only makes the assembly of each component more convenient and quick, and easy to produce, but also reduces the cost of the transducer device 100, so that the transducer device 100 of the embodiment of the present invention is more suitable for popularization and use.

Please continue to refer to Figure 3. In some embodiments, the buffer assembly 15 may include: a buffer chamber 151, which is configured as a circular channel, the circular channel is formed on the wall surface of the accommodating chamber 13 located at the first part 11, and is used to connect the accommodating chamber 13 with the external environment; and a piston assembly 152, which is sealed in the circular channel, and the piston assembly 152 is configured to be able to slide axially relative to the circular channel.

The piston assembly 152 mentioned in the present application may include a balancing piston 1521 and a corrugated retaining ring 1522 sleeved on the balancing piston 1521. The corrugated retaining ring 1522 is used to install the balancing piston 1521 in the buffer chamber 151. In the present application, under high temperature and high pressure conditions underground, the balancing piston 1521 will move back and forth to balance the internal and external pressures due to the effect of the internal and external pressure difference. Through the specific setting of the piston assembly 152, such as the setting of the stroke of the balancing piston 1521, even under the extreme conditions of 205℃/140MPa, the hydraulic oil pressure inside the transducer device 100 of the embodiment of the present invention can still be consistent with the wellbore mud pressure, so that the transducer device 100 of the embodiment of the present invention always maintains a normal working state.

Please refer to Figure 4. In some embodiments, the transducer body 2 may include: a transducer housing 22, one end of which is sealed and fixedly connected to the second part 12, and the other end is arranged in the accommodating cavity 13, and an opening is formed on the side of the transducer housing 22 facing the transmitting and receiving window 121; a crystal component 23, which is arranged in the transducer housing 22 and close to the opening, the crystal component 23 is electrically connected to the connector 16 through a wire 24, and the transmission surface of the crystal component 23 is arranged to be parallel to the plane where the opening is located; a matching layer 25, which is arranged in the opening, and at the same time, the matching layer 25 is attached to the transmission surface of the crystal component 23; a backing 26, which is filled in the transducer housing 22, and at the same time, the backing 26 is attached to the side of the crystal component 23 opposite to the matching layer 25, and the matching layer 25 and the backing 26 are used to fix the crystal component 23 to the transducer housing 22.

The shape and size of the transducer body 2 mentioned in the present application can be determined in combination with the shape and size of the casing to be detected, and the shape and size of the required crystal assembly 23 can be further determined to obtain an excitation signal and waveform component that is more suitable for the casing to be detected. For example, a stronger excitation signal and a more single waveform component can be obtained by determining the shape and size of the crystal assembly 23, thereby obtaining a better detection effect. The matching layer 25 mentioned in the present application can be multi-layered or multi-layered to further enable the ultrasonic signal to have the maximum transmission effect in the wellbore mud environment, so that the transducer body 2 can obtain a higher echo signal. The matching layer 25 mentioned in the present application serves to increase the sound transmission effect. The backing 26 mentioned in the present application serves to absorb the ultrasonic wave transmitted to the tail.

In some embodiments, the crystal assembly 23 may include a plurality of crystals (not shown in the figure), and the material of the crystals is piezoelectric material.

In some embodiments, the crystal assembly 23 may further include a composite layer (not shown in the figure) for fixing a plurality of crystals, and the composite layer is an epoxy resin layer.

In some embodiments, the piezoelectric material is a piezoelectric ceramic, and the crystal structure is: a plurality of columnar piezoelectric ceramics (not shown in the figure) are arranged in a non-periodic and uniform manner.

The crystal component 23 mentioned in the present application can be made by an insertion-filling method. The crystal component 23 mentioned in the present application can be a 1-3 type piezoelectric composite material. The piezoelectric material mentioned in the present application can be a piezoelectric ceramic (PZT). The piezoelectric composite material mentioned in the present application is made by combining piezoelectric ceramics with polymers (such as epoxy resins or other polymers). The non-periodic uniform distribution mentioned in the present application can be understood as a number of columnar piezoelectric ceramics uniformly distributed in an irregular position relationship and without repeating units, which is compared to periodic uniform distribution. Periodic uniform distribution is to contain repeating units and be distributed in a regular position relationship.

Through the above-mentioned arrangement, the crystal assembly 23 of the present application can eliminate the lateral structural vibration mode by evenly distributing the piezoelectric ceramic (PZT) small columns non-periodically, thereby being able to obtain a relatively pure thickness vibration mode, while not changing other properties of the composite material. Further, by selecting a suitable volume percentage of the piezoelectric phase of the piezoelectric ceramic (PZT) (for example, selecting a volume percentage of the piezoelectric phase of 20% to 30%), the acoustic impedance of the crystal assembly 23 (piezoelectric composite material) can be very low (about 3 MRayls), so that it is easy to select a suitable epoxy material to make the radiation matching layer 25, so as to achieve efficient transmission and reception of ultrasonic signals.

For example, for seawater load, according to the ultrasonic penetration theory, a quarter-wavelength matching layer 25 is used, and for the crystal component 23 with a phase volume percentage of 30% of piezoelectric ceramic (PZT), according to the following formula:

Wherein, Z is the characteristic impedance of the quarter-wavelength matching layer 25, _Zwater is the characteristic impedance of the water load, and _Zcomposite is the characteristic impedance of the crystal assembly 23 (piezoelectric composite material).

Through calculation of the above formula, it can be known that Z is 2.89 Mrayl. The characteristic impedance of 618 epoxy resin is 2.88 Mrayl, which is very close to the value of Z, so 618 epoxy resin can be more convenient for making the radiation impedance matching layer 25.

At the same time, the crystal component 23 (piezoelectric composite material) has a large piezoelectric coefficient (approximately 300-350pC/N), a moderate dielectric constant (approximately 250-500), a large electromechanical coupling coefficient (approximately 60%-70%), and a small mechanical quality factor Q value (approximately 5-10). By selecting the volume percentage of the piezoelectric ceramic (PZT) phase in the crystal component 23 (piezoelectric composite material) and selecting a suitable matching layer 25 and backing 26, a broadband and high-sensitivity transducer can be produced.

For example, the volume percentage of the piezoelectric ceramic (PZT) phase in the crystal component 23 (piezoelectric composite material) is selected to be 26%, the radiation impedance matching layer 25 of the transducer body 2 is 618 epoxy resin, and the backing 26 of the transducer body 2 is a mixture of tungsten powder and epoxy. The results of the pulse-reflection detection using a 5072PR sharp pulse transmitter in clear water can be shown in the following table:

Combined with the above data, it can be seen that the bandwidth range of the transducer body 2 is 183kHz~747kHz, the bandwidth is 121%, the echo amplitude is 328mV (attenuation is -20dB), and the loop sensitivity is -34dB, which fully meets the detection requirements of casings with different wall thicknesses and high attenuation conditions in the well.

As described above, the wafer of the transducer body 2 of the present application uses a composite material, which can ensure high sensitivity while maintaining a high frequency bandwidth. Under the same test conditions, the sensitivity of the crystal assembly 23 (piezoelectric composite material) is at least 10 times that of the commonly used ultrasonic piezoelectric ceramic wafer. Therefore, even under the high attenuation conditions of heavy oil-based mud with a density of 1.85g/ ^cm3 , the pulse echo signal reflected from the inner wall of the casing can still be detected. The bandwidth of the transducer body 2 exceeds 110%, and it can detect the casing wall thickness of 4.5mm to 15.2mm, meeting the detection requirements of most cased wells.

In some embodiments, the material of the matching layer 25 may be an epoxy material, the epoxy material may be epoxy resin, and the material of the transducer housing 22 may be polyetheretherketone.

Through the above settings, combined with the description of the crystal in the text, including the setting of the crystal structure and the selection of the crystal material, the crystal assembly 23 can adapt to work under high temperature and high pressure. In the present application, by using high temperature resistant epoxy resin and high temperature resistant engineering plastic polyetheretherketone to encapsulate the transducer body 2, it can meet the requirements that the entire transducer body 2 can still work stably and reliably at about 205°C. At the same time, it can also make the transducer body 2 have insulation and good mechanical strength, thereby effectively ensuring the performance of the transducer device 100.

FIG5 is a schematic diagram of the structure of some embodiments of the scanning device of the embodiment of the present invention; FIG6 is a schematic diagram of the use state of the scanning device of the embodiment of the present invention. In combination with FIG5 and FIG6, according to the second aspect of the present invention, a scanning device 200 is provided, comprising: an instrument housing 201; a motor 202, which is arranged inside the instrument housing 201; a transmission shaft 203, one end of which is connected to the motor 202 and the other end extends out of the instrument housing 201; and a transducer device 100 provided according to the first aspect of the present invention. The transducer device 100 is arranged outside the instrument housing 201, and the transducer device 100 is detachably connected to the end of the transmission shaft 203.

According to the actual size of the casing, the outer diameter size of the scanning device 200 needs to have several kinds, so that when the scanning device 200 works underground, a certain distance is maintained between the transducer device 100 and the inner wall of the casing to ensure that the available ultrasonic reflection signal is received. It is usually necessary to maintain it between 25mm and 50mm. In this way, when a logging operation needs to detect casings of different specifications, it is necessary to replace the scanning device 200 with different outer diameters on site. In the prior art, the transducer is immersed in the hydraulic oil inside the scanning device 200, so each time the transducer is replaced, multiple steps such as draining oil, disassembling, replacing the transducer, installing the transducer, and filling oil are required, which is very cumbersome and time-consuming. The scanning device 200 of the embodiment of the present invention sets the transducer device 100 as a separate device, which does not need to be connected to the hydraulic oil inside the scanning device 200 to achieve the balance of internal and external pressures. Therefore, the present application can design the connection part of the transducer device 100 and the transmission shaft 203 of the scanning device 200 into a quick-screw nut docking structure. In this way, rapid docking can be achieved on site, which is very quick and convenient, thereby improving the operating time efficiency of the scanning device 200.

It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims (9)

1. A transducer device, comprising: A device housing is formed with a receiving cavity inside, the device housing comprises a first part and a second part sealed and fixedly connected to the first part, wherein the wall surface of the first part is provided with: an oil filling hole connected to the receiving cavity, a buffer assembly and a connector; the second part is formed with a transmitting and receiving window; and a transducer body, which is disposed in the accommodating cavity, the transducer body comprising a transmitting and receiving end, the transmitting and receiving end being disposed toward the transmitting and receiving window and being sealed and fixed in the second part, the transducer body being electrically connected to the connector; Among them, the oil filling hole is used to input hydraulic medium into the accommodating chamber; the buffer assembly is used to balance the pressure difference between the accommodating chamber and the external environment; the connector is used to communicate and/or power supply with the outside; the buffer assembly includes: a buffer chamber, which is configured as a circular channel, the circular channel is formed on the wall surface of the accommodating chamber located on the first part, and the circular channel is used to connect the accommodating chamber with the external environment; a piston assembly, which is sealed in the circular channel, and the piston assembly is configured to be axially slidable relative to the circular channel. 2. The transducer device according to claim 1 is characterized in that the interior of the second part is configured as an installation cavity that matches the outer peripheral wall of the transmitting and receiving ends, wherein an annular groove is formed on the inner peripheral wall of the installation cavity, a sealing ring is installed in the annular groove, and the sealing ring forms a sealed connection with the outer peripheral wall of the transducer body. 3. The transducer device according to claim 2 is characterized in that a retaining ring is fixed at a position of the mounting cavity close to the transmitting and receiving window, and the retaining ring is used to limit the transducer body in the axial direction. 4. The transducer device according to any one of claims 1 to 3, characterized in that the transducer body comprises: A transducer housing, one end of which is sealed and fixed to the second part, and the other end of which is disposed in the accommodating cavity, and an opening is formed on a side of the transducer housing facing the transmitting and receiving window; A crystal assembly is disposed in the transducer housing and close to the opening, the crystal assembly is electrically connected to the connector through a wire, and a transmission surface of the crystal assembly is arranged to be parallel to the plane where the opening is located; A matching layer is disposed in the opening, and the matching layer is attached to the transmission surface of the crystal component; A backing is filled in the transducer housing and is attached to a side of the crystal assembly opposite to the matching layer. The matching layer and the backing are used to fix the crystal assembly to the transducer housing. 5 . The transducer device according to claim 4 , wherein the crystal assembly comprises a plurality of crystals, and the material of the crystals is piezoelectric material. 6 . The transducer device according to claim 5 , wherein the crystal assembly further comprises a composite layer for fixing the plurality of crystals, and the composite layer is constructed as an epoxy resin layer. 7 . The transducer device according to claim 6 , wherein the piezoelectric material is piezoelectric ceramics, and the crystal structure is composed of a plurality of columnar piezoelectric ceramics arranged in a non-periodic uniform manner. 8 . The transducer device according to claim 4 , wherein the matching layer is made of epoxy material, and the transducer housing is made of polyetheretherketone. 9. A scanning device, comprising: Instrument housing; A motor, which is arranged inside the instrument housing; A transmission shaft, one end of which is connected to the motor and the other end of which extends out of the instrument housing; A transducer device according to any one of claims 1 to 8; The transducer device is arranged outside the instrument housing, and the transducer device is detachably connected to the end of the transmission shaft.