Underwater exciter

Abstract

The application discloses an underwater exciter. The underwater exciter comprises a shell, a driving device, and a fan. The shell has a top cover, a bottom cover, and a side wall. The driving device comprises a moving coil coaxially arranged with the shell, a driving coil, a center magnetic pole, a magnetic cylinder group, and an excitation coil. The driving coil is sleeved outside the center magnetic pole and connected with the moving coil to drive the moving coil to move up and down. The fixed cover group comprises an upper fixed cover and a lower fixed cover. The upper fixed cover has an upper air vent. The lower fixed cover has a lower air vent. The fan comprises a fan shell with an air outlet and a power element. The outer wall surface of the side wall has a groove. The air outlet, the magnetic cylinder air vent, the magnetic pole air vent, the gap between the moving coil and the center magnetic pole and the magnetic cylinder group, the gap between the driving coil and the center magnetic pole and the magnetic cylinder group, the upper air vent, and the lower air vent are connected to form an internal circulation airflow passage. The cooling of the driving coil and the excitation coil can be considered, and the cooling efficiency is improved.

Description

Technical Field

[0001] This invention relates to an underwater electro-powered device, and more particularly to an underwater vibrator. Background Technology

[0002] With the continuous development of marine resources and the advancement of underwater technology, underwater vibrators, as an important vibration source device, have been widely used in scientific research, resource exploration, and engineering applications. Their core function is to convert electrical energy into mechanical energy, thereby generating vibration signals for use in seabed geological exploration, marine environmental monitoring, and underwater communication.

[0003] During operation, underwater vibrators generate a significant amount of heat from their electromagnetic components. If this heat cannot be effectively dissipated, it will affect the vibrator's normal operation and lifespan. The vibrator primarily generates heat from two components: the drive coil and the excitation coil. Low-power vibrators generate relatively little heat and can typically be cooled naturally; however, high-power vibrators require specialized cooling solutions. Current cooling solutions mainly target the excitation coil, neglecting the cooling needs of the drive coil. Therefore, how to balance the cooling of both the drive and excitation coils to meet the cooling requirements of high-power vibrators is a pressing issue that needs to be addressed in this field. Summary of the Invention

[0004] The purpose of this invention is to provide an underwater vibrator that can cool both the drive coil and the excitation coil, thereby improving cooling efficiency.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide an underwater vibrator, comprising:

[0006] The housing has a top cover, a bottom cover, and a side wall connecting the top cover and the bottom cover, the top cover, the bottom cover and the side wall being sealed together and surrounding to form a receiving cavity;

[0007] A driving device is disposed within the receiving cavity. The driving device includes: a moving coil, a driving coil, a central magnetic pole, a magnetic cylinder assembly, and an excitation coil, all coaxially arranged with the outer shell. The moving coil is fixedly connected to the top cover. The driving coil is sleeved outside the central magnetic pole and connected to the moving coil, driving the moving coil to move up and down. The magnetic cylinder assembly and the excitation coil are sleeved outside the driving coil and the central magnetic pole, respectively. The bottom magnetic cylinder of the magnetic cylinder assembly extends below the central magnetic pole, and the area where the bottom magnetic cylinder extends below the central magnetic pole has a magnetic cylinder ventilation hole. The central magnetic pole has a magnetic pole ventilation hole communicating with the magnetic cylinder ventilation hole. There is a gap between the moving coil and the central magnetic pole, the magnetic cylinder assembly, and the excitation coil as they move.

[0008] A fixed cover assembly, disposed within the receiving cavity, includes: an upper fixed cover spaced apart from the top surface of the top cover and a lower fixed cover spaced apart from the bottom surface of the bottom cover; the upper fixed cover is fixed to the side of the magnetic cylinder assembly facing the top cover and extends radially to be fixedly connected to the outer shell, the upper fixed cover having an upper ventilation hole; the lower fixed cover is fixed to the bottom magnetic cylinder and extends radially to be fixedly connected to the outer shell, the lower fixed cover having a lower ventilation hole communicating with the upper ventilation hole; the lower fixed cover has a hollow area, the magnetic cylinder ventilation hole communicating with the hollow area;

[0009] A fan is disposed within the receiving cavity and located between the moving coil and the bottom cover. The fan includes: a fan housing with an air outlet, and a power component disposed within the fan housing; the fan housing is fixed to the lower fixed cover and spaced apart from the bottom cover, and the fan housing covers the area of ​​the bottom magnetic cylinder having the magnetic cylinder ventilation hole.

[0010] The outer wall surface of the sidewall has a groove, and the sidewall is arranged around the outer periphery of the magnetic cylinder assembly; the air outlet, the magnetic cylinder ventilation hole, the magnetic pole ventilation hole, the gap between the moving coil and the central magnetic pole and the magnetic cylinder assembly, the gap between the drive coil and the central magnetic pole and the magnetic cylinder assembly, the upper ventilation hole, and the lower ventilation hole are connected to form an internal circulation airflow passage.

[0011] Compared to existing technologies, the embodiments of this invention form an internal circulating airflow path by connecting the air vent, the magnetic cylinder ventilation hole, the magnetic pole ventilation hole, the gap between the moving coil and the central magnetic pole and the magnetic cylinder assembly, the gap between the drive coil and the central magnetic pole and the magnetic cylinder assembly, the upper ventilation hole, and the lower ventilation hole. Under the action of the fan, the heat generated by the excitation coil and the drive coil flows through the air vent to the magnetic cylinder ventilation hole, through the magnetic pole ventilation hole to the gap between the moving coil and the central magnetic pole and the magnetic cylinder assembly, then through the upper ventilation hole to the lower ventilation hole, and back to the air vent, completing the circulation flow. This allows the hot airflow to contact and transfer to the external water medium through the upper fixed cover, the upper fixed cover, and the outer shell. Because the temperature of the external water medium is low, the groove increases the contact area between the water medium and the outer shell, improving the cooling efficiency, thereby achieving cooling of the excitation coil and the drive coil. In addition, the excitation coil is set in the magnetic cylinder assembly and in contact with the magnetic cylinder assembly. Some of the heat from the excitation coil is also transferred through the magnetic cylinder assembly to the upper fixed cover, the lower fixed cover, and the outer shell, and then through the outer shell to the external water medium. This achieves cooling for both the drive coil and the excitation coil, thus improving cooling efficiency.

[0012] In one embodiment, the grooves extend along the axial direction of the housing and are multiple; the multiple grooves are axially arranged around the outer periphery of the sidewall.

[0013] In one embodiment, the sidewall has a slot extending through the sidewall along the axial direction of the housing, with the upper and lower openings of the slot respectively connecting to the upper ventilation hole and the lower ventilation hole.

[0014] In one embodiment, there are multiple upper ventilation holes, lower ventilation holes, and slots, and the number of each is the same and they are arranged in a one-to-one correspondence.

[0015] The plurality of upper ventilation holes, the plurality of lower ventilation holes, and the plurality of slots are all arranged around the axis of the outer casing.

[0016] In one embodiment, the fan and the moving coil are coaxially arranged; the central magnetic pole is specifically hollow; and the power component is installed inside the hollow cavity.

[0017] In one embodiment, the fan housing protrudes between the lower fixed cover and the bottom cover, and the bottom cover is in the shape of a frustum protruding away from the lower fixed cover.

[0018] In one embodiment, both the magnetic cylinder ventilation holes and the magnetic pole ventilation holes are multiple and of the same quantity, and are arranged in a one-to-one correspondence;

[0019] Both the magnetic cylinder ventilation hole and the magnetic pole ventilation hole extend along the axial direction of the outer casing and are arranged around the axial direction of the outer casing.

[0020] In one embodiment, the moving coil has a moving coil ventilation hole that connects to the internal circulation airflow passage.

[0021] In one embodiment, the magnetic cylinder assembly further includes a top magnetic cylinder connected to the upper fixed cover and an inner magnetic cylinder sandwiched between the top magnetic cylinder and the bottom magnetic cylinder;

[0022] The inner magnetic cylinder has an upper placement slot that opens toward the top magnetic cylinder and a lower placement slot that opens toward the bottom magnetic cylinder; an excitation coil is fixed in both the upper placement slot and the lower placement slot.

[0023] Thermally conductive insulating adhesive is sandwiched between the top magnetic cylinder and the excitation coil, between the inner magnetic cylinder and the excitation coil, and between the bottom magnetic cylinder and the excitation coil.

[0024] In one embodiment, the sidewall extends radially and abuts against the top magnetic cylinder, the inner magnetic cylinder, and the bottom magnetic cylinder;

[0025] The upper fixing cover is clamped between the side wall and the top cover, and the side of the upper fixing cover is located outside the receiving cavity; the lower fixing cover is clamped between the side wall and the bottom cover, and the side of the lower fixing cover is located outside the receiving cavity. Attached Figure Description

[0026] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0027] Figure 1 This is a schematic diagram of the underwater vibrator according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of an underwater vibrator from another angle according to an embodiment of the present invention;

[0029] Figure 3 This is a cross-sectional view of an underwater vibrator according to an embodiment of the present invention;

[0030] Among them, 100, underwater vibrator; 1, outer shell; 11, top cover; 111, outer ring cover; 112, inner ring cover; 113, sealing intermediate ring; 12, bottom cover; 13, side wall; 131, groove; 132, slot; 21, moving coil; 210, moving coil ventilation hole; 22, drive coil; 23, center magnetic pole; 230, magnetic pole ventilation hole; 24, magnetic cylinder assembly; 240, magnetic cylinder ventilation hole; 241, bottom magnetic cylinder; 242, top magnetic cylinder; 243, inner magnetic cylinder; 25, excitation coil; 31, upper fixed cover; 310, upper ventilation hole; 32, lower fixed cover; 320, lower ventilation hole; 4, fan; 41, fan casing; 410, air outlet; 5, thermally conductive insulating adhesive. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of the present invention to enable the reader to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0032] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0033] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0034] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative of the essential spirit of the technical solution of the present invention.

[0035] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0036] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0037] In the following description, in order to clearly demonstrate the structure and working method of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0038] Embodiments of the present invention are described below with reference to the accompanying drawings.

[0039] One embodiment of the present invention provides an underwater vibrator 100. For example... Figure 1 , Figure 2 , Figure 3As shown, the underwater vibrator 100 includes: a housing 1, a drive unit, a fixed cover assembly, and a blower 4. The housing 1 has a top cover 11, a bottom cover 12, and a side wall 13 connecting the top cover 11 and the bottom cover 12. The top cover 11, the bottom cover 12, and the side wall 13 are sealed together and form a receiving cavity. The drive unit is disposed in the receiving cavity and includes: a moving coil 21 coaxially arranged with the housing 1, a drive coil 22, a central magnetic pole 23, a magnetic cylinder assembly 24, and an excitation coil 25. The magnetic cylinder assembly 24 and the excitation coil 25 are sleeved outside the drive coil 22 and the central magnetic pole 23. The moving coil 21 is fixedly connected to the top cover 11, and the drive coil 22 is sleeved outside the central magnetic pole 23 and connected to the moving coil 21, driving the moving coil 21 to move up and down. The top cover 11 has an outer ring cover 111, an inner ring cover 112, and a sealing intermediate ring 113 that seals and connects the outer ring cover 111 and the inner ring cover 112. The sealing intermediate ring 113 is elastic. The moving coil 21 is connected to the inner ring cover 112 and can drive the inner ring cover 112 to vibrate up and down. The excitation coil 25 is located inside the magnetic cylinder assembly 24. The excitation coil 25 is energized to generate a fixed magnetic field. The drive coil 22 is energized with alternating current to reciprocate in the constant magnetic field, thereby allowing the moving coil 21 to drive the movable area of ​​the top cover 11.

[0040] like Figure 1 , Figure 2 , Figure 3 As shown, the bottom magnetic cylinder 241 of the magnetic cylinder assembly 24 extends below the central magnetic pole 23, and the area where the bottom magnetic cylinder 241 extends below the central magnetic pole 23 has a magnetic cylinder ventilation hole 240. The central magnetic pole 23 has a magnetic pole ventilation hole 230 communicating with the magnetic cylinder ventilation hole 240. There is a gap between the moving coil 21 and the drive coil 22 and the central magnetic pole 23, the magnetic cylinder assembly 24, and the excitation coil 25. The fixed cover assembly includes: an upper fixed cover 31 spaced apart from the top surface of the top cover 11 and a lower fixed cover 32 spaced apart from the bottom surface of the bottom cover 12; the upper fixed cover 31 is fixed to the side of the magnetic cylinder assembly 24 facing the top cover 11 and extends radially to be fixedly connected to the outer shell 1, and the upper fixed cover 31 has an upper ventilation hole 310. The lower fixed cover 32 is fixed to the bottom magnetic cylinder 241 and extends radially to be fixedly connected to the outer shell 1, and the lower fixed cover 32 has a lower ventilation hole 320 communicating with the upper ventilation hole 310. The lower fixed cover 32 has a hollow area, and the magnetic cylinder ventilation hole 240 communicates with the hollow area. The fan 4 is disposed within the receiving cavity and located between the moving coil 21 and the bottom cover 12. The fan 4 includes: a fan housing 41 with an air outlet 410, and a power component (not shown in the figure) disposed within the fan housing 41, the power component being a motor connected to the fan. The fan housing 41 is fixed to the lower fixed cover 32 and spaced apart from the bottom cover 12, and the fan housing 41 covers the area of ​​the bottom magnetic cylinder 241 with the magnetic cylinder ventilation hole 240. In other words, the hollow area is as follows: Figure 1The opening is covered by the fan housing 41, and the magnetic cylinder ventilation hole 240 is also located in the area covered by the fan housing 41. The fan housing 41 also has multiple air vents 410 to facilitate airflow. The outer wall surface of the side wall 13 has a groove 131, and the side wall 13 is arranged around the outer periphery of the magnetic cylinder assembly 24. For example... Figure 1 , Figure 3 As shown by the middle arrow A, the air vent 410, the magnetic cylinder ventilation hole 240, the magnetic pole ventilation hole 230, the gap between the moving coil 21 and the central magnetic pole 23 and the magnetic cylinder group 24, the gap between the drive coil 22 and the central magnetic pole 23 and the magnetic cylinder group 24, the upper ventilation hole 310, and the lower ventilation hole 320 are connected to form an internal circulation airflow passage.

[0041] Because an internal circulation airflow path is formed by connecting the air vent 410, the magnetic cylinder ventilation hole 240, the magnetic pole ventilation hole 230, the gap between the moving coil 21 and the central magnetic pole 23 and the magnetic cylinder group 24, the gap between the drive coil 22 and the central magnetic pole 23 and the magnetic cylinder group 24, the upper ventilation hole 310, and the lower ventilation hole 320, under the action of the fan 4, the heat generated by the excitation coil 25 and the drive coil 22 is allowed to pass through the air vent 410 to the magnetic cylinder ventilation hole 240, through the magnetic pole ventilation hole 230 to the gap between the moving coil 21 and the central magnetic pole 23 and the magnetic cylinder group 24, and then through the upper ventilation hole 310 to the lower ventilation hole 320, and back to the air vent 410, completing the circulation flow. This allows the hot airflow to contact the upper fixed cover 31, the upper fixed cover 31 and the outer shell 1 and be transferred to the external water medium. Because the temperature of the external water medium is low, the groove 131 increases the contact area between the water medium and the outer shell 1, and the cooling efficiency is improved, thereby achieving the cooling of the excitation coil 25 and the drive coil 22. In addition, the excitation coil 25 is disposed in the magnetic cylinder assembly 24 and is in contact with the magnetic cylinder assembly 24. Some of the heat from the excitation coil 25 is also transferred through the magnetic cylinder assembly 24 to the upper fixed cover 31, the lower fixed cover 32 and the outer casing 1, and then transferred to the external water medium through the outer casing 1. This achieves cooling for both the drive coil 22 and the excitation coil 25, improving cooling efficiency.

[0042] Furthermore, such as Figure 1 , Figure 2 , Figure 3 As shown, the grooves 131 extend along the axial direction of the outer shell 1 and are multiple in number, with the multiple grooves 131 axially arranged around the outer periphery of the side wall 13. This increases the contact area between the side wall 13 and the external water, and the up-and-down movement of the moving coil 21 causes the middle area of ​​the top cover 11 to vibrate, that is, the working area is located on the top cover 11. When the grooves 131 on the side wall 13 are provided to improve cooling efficiency, the vibration of the top cover 11 will not be affected.

[0043] In addition, such as Figure 1 , Figure 2 , Figure 3As shown, the magnetic cylinder assembly 24 also includes a top magnetic cylinder 242 connected to the upper fixed cover 31, and an inner magnetic cylinder 243 clamped between the top magnetic cylinder 242 and the bottom magnetic cylinder 241. The inner magnetic cylinder 243 has an upper placement slot opening towards the top magnetic cylinder 242 and a lower placement slot opening towards the bottom magnetic cylinder 241. Excitation coils 25 are fixed in both the upper and lower placement slots. Thermally conductive insulating adhesive 5 is clamped between the top magnetic cylinder 242 and the excitation coil 25, between the inner magnetic cylinder 243 and the excitation coil 25, and between the bottom magnetic cylinder 241 and the excitation coil 25. Specifically, the upper and lower placement slots also open towards the side of the central magnetic pole 23. The thermally conductive insulating adhesive 5 is adhered to the walls of the upper and lower placement slots. Thermally conductive insulating adhesive 5 is also provided on the bottom surface of the top magnetic cylinder 242 corresponding to the area of ​​the excitation coil 25, and thermally conductive insulating adhesive 5 is also provided on the top surface of the bottom magnetic cylinder 241 corresponding to the area of ​​the excitation coil 25. The heat generated by the excitation coil 25 can be more efficiently transferred to the magnetic cylinder assembly 24, and then to the side wall 13, upper fixed cover 31, and lower fixed cover 32, thus achieving better heat dissipation. The thermally conductive insulating adhesive 5 can be a high-temperature epoxy resin single-component adhesive.

[0044] Furthermore, such as Figure 1 , Figure 2 , Figure 3 As shown, the side wall 13 extends radially and abuts against the top magnetic cylinder 242, the inner magnetic cylinder 243, and the bottom magnetic cylinder 241. The upper fixing cover 31 is clamped between the side wall 13 and the top cover 11, and the side of the upper fixing cover 31 is located outside the receiving cavity. The lower fixing cover 32 is clamped between the side wall 13 and the bottom cover 12, and the side of the lower fixing cover 32 is located outside the receiving cavity. This allows the sides of both the upper fixing cover 31 and the lower fixing cover 32 to come into contact with external water, facilitating heat dissipation when heat is transferred to the upper fixing cover 31 and the lower fixing cover 32.

[0045] In addition, such as Figure 1 , Figure 2 , Figure 3 As shown, the side wall 13 has a slot 132 that extends through the side wall 13 along the axial direction of the outer shell 1. The upper and lower openings of the slot 132 are respectively connected to the upper ventilation hole 310 and the lower ventilation hole 320.

[0046] Furthermore, such as Figure 1 , Figure 2 , Figure 3 As shown, there are multiple upper ventilation holes 310, lower ventilation holes 320, and slots 132, and the same number of each is provided in a one-to-one correspondence. The multiple upper ventilation holes 310, multiple lower ventilation holes 320, and multiple slots 132 are arranged around the axis of the outer shell 1, allowing airflow to circulate through the multiple slots 132, which allows the airflow to have a larger contact area with the side wall 13, allowing heat to be conducted away and better dissipated.

[0047] Furthermore, such as Figure 1, Figure 2 , Figure 3 As shown, the fan 4 is coaxially arranged with the moving coil 21, and the central magnetic pole 23 is specifically hollow. The power component is installed inside the hollow cavity. With a better layout of the internal space of the outer casing 1 and a reasonable arrangement of the fan 4, the formed internal circulation airflow path can more effectively conduct heat flow to the outer casing 1, the upper fixed cover 31, and the lower fixed cover 32, resulting in better heat dissipation.

[0048] Furthermore, such as Figure 1 , Figure 2 , Figure 3 As shown, the fan housing 41 protrudes between the lower fixed cover 32 and the bottom cover 12, and the bottom cover 12 is a frustum-shaped structure protruding away from the lower fixed cover 32. This increases the contact area between the bottom cover 12 and the external water medium, facilitating heat dissipation.

[0049] In addition, such as Figure 1 , Figure 2 , Figure 3 As shown, there are multiple and identical magnetic cylinder ventilation holes 240 and magnetic pole ventilation holes 230, arranged in a one-to-one correspondence. Both the magnetic cylinder ventilation holes 240 and magnetic pole ventilation holes 230 extend along the axial direction of the outer casing 1 and are arranged circumferentially around the axis of the outer casing 1. The excitation coil 25 is located axially in the area surrounded by the side wall 13, so that the heat generated by the excitation coil 25 can be transferred to the side wall 13 for heat dissipation.

[0050] Furthermore, such as Figure 1 , Figure 2 , Figure 3 As shown, the moving coil 21 has a moving coil ventilation hole 210 that connects to the internal circulation airflow passage, thereby improving heat dissipation. The moving coil ventilation hole 210 has multiple holes.

[0051] The preferred embodiments of the present invention have been described in detail above, but it should be understood that, if necessary, aspects of the embodiments can be modified to utilize aspects, features, and concepts from various patents, applications, and publications to provide other embodiments.

[0052] In light of the detailed description above, these and other changes can be made to the embodiments. Generally, the terminology used in the claims should not be considered limited to the specific embodiments disclosed in the specification and claims, but should be understood to include all possible embodiments together with the full scope of equivalents enjoyed by these claims.

[0053] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. An underwater vibrator, characterized in that, include: The housing has a top cover, a bottom cover, and a side wall connecting the top cover and the bottom cover, the top cover, the bottom cover and the side wall being sealed together and surrounding to form a receiving cavity; A driving device is disposed within the receiving cavity. The driving device includes: a moving coil, a driving coil, a central magnetic pole, a magnetic cylinder assembly, and an excitation coil, all coaxially arranged with the outer shell. The moving coil is fixedly connected to the top cover. The driving coil is sleeved outside the central magnetic pole and connected to the moving coil, driving the moving coil to move up and down. The magnetic cylinder assembly and the excitation coil are sleeved outside the driving coil and the central magnetic pole, respectively. The bottom magnetic cylinder of the magnetic cylinder assembly extends below the central magnetic pole, and the area where the bottom magnetic cylinder extends below the central magnetic pole has a magnetic cylinder ventilation hole. The central magnetic pole has a magnetic pole ventilation hole communicating with the magnetic cylinder ventilation hole. There is a gap between the moving coil and the driving coil and the central magnetic pole, the magnetic cylinder assembly, and the excitation coil. A fixed cover assembly includes: an upper fixed cover spaced apart from the top surface of the top cover and a lower fixed cover spaced apart from the bottom surface of the bottom cover; the upper fixed cover is fixed to the side of the magnetic cylinder assembly facing the top cover and extends radially to be fixedly connected to the outer shell, and the upper fixed cover has an upper ventilation hole; the lower fixed cover is fixed to the bottom magnetic cylinder and extends radially to be fixedly connected to the outer shell, and the lower fixed cover has a lower ventilation hole communicating with the upper ventilation hole; the lower fixed cover has a hollow area, and the magnetic cylinder ventilation hole communicates with the hollow area; A fan is disposed within the receiving cavity and located between the moving coil and the bottom cover. The fan includes: a fan housing with an air outlet, and a power component disposed within the fan housing; the fan housing is fixed to the lower fixed cover and spaced apart from the bottom cover, and the fan housing covers the area of ​​the bottom magnetic cylinder having the magnetic cylinder ventilation hole. The outer wall surface of the sidewall has a groove, and the sidewall is arranged around the outer periphery of the magnetic cylinder assembly; the air outlet, the magnetic cylinder ventilation hole, the magnetic pole ventilation hole, the gap between the moving coil and the central magnetic pole and the magnetic cylinder assembly, the gap between the drive coil and the central magnetic pole and the magnetic cylinder assembly, the upper ventilation hole, and the lower ventilation hole are connected to form an internal circulation airflow passage.

2. The underwater vibrator according to claim 1, characterized in that, The grooves extend along the axial direction of the outer shell and are multiple in number; the multiple grooves are axially arranged around the outer periphery of the sidewall.

3. The underwater vibrator according to claim 2, characterized in that, The sidewall has a slot that extends through the sidewall along the axial direction of the outer shell, and the upper and lower openings of the slot respectively connect to the upper ventilation hole and the lower ventilation hole.

4. The underwater vibrator according to claim 3, characterized in that, The upper ventilation hole, the lower ventilation hole, and the slot are all multiple and the same number are set in a one-to-one correspondence. The plurality of upper ventilation holes, the plurality of lower ventilation holes, and the plurality of slots are all arranged around the axis of the outer casing.

5. The underwater vibrator according to claim 1, characterized in that, The fan and the moving coil are coaxially arranged; the central magnetic pole is specifically hollow; the power component is installed inside the hollow cavity.

6. The underwater vibrator according to claim 1, characterized in that, The air casing protrudes between the lower fixed cover and the bottom cover, and the bottom cover is in the shape of a frustum protruding away from the lower fixed cover.

7. The underwater vibrator according to claim 1, characterized in that, The magnetic cylinder ventilation holes and the magnetic pole ventilation holes are both multiple and the same in number, and are set in a one-to-one correspondence; Both the magnetic cylinder ventilation hole and the magnetic pole ventilation hole extend along the axial direction of the outer casing and are arranged around the axial direction of the outer casing.

8. The underwater vibrator according to claim 1, characterized in that, The moving coil has a moving coil ventilation hole that connects to the internal circulation airflow passage.

9. The underwater vibrator according to claim 1, characterized in that, The magnetic cylinder assembly also includes a top magnetic cylinder connected to the upper fixed cover and an inner magnetic cylinder clamped between the top magnetic cylinder and the bottom magnetic cylinder; The inner magnetic cylinder has an upper placement slot that opens toward the top magnetic cylinder and a lower placement slot that opens toward the bottom magnetic cylinder; an excitation coil is fixed in both the upper placement slot and the lower placement slot. Thermally conductive insulating adhesive is sandwiched between the top magnetic cylinder and the excitation coil, between the inner magnetic cylinder and the excitation coil, and between the bottom magnetic cylinder and the excitation coil.

10. The underwater vibrator according to claim 9, characterized in that, The sidewall extends radially and abuts against the top magnetic cylinder, the inner magnetic cylinder, and the bottom magnetic cylinder; The upper fixing cover is clamped between the side wall and the top cover, and the side of the upper fixing cover is located outside the receiving cavity; the lower fixing cover is clamped between the side wall and the bottom cover, and the side of the lower fixing cover is located outside the receiving cavity.

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