Blade type underwater low-frequency transducer

Abstract

The utility model relates to a blade type underwater low-frequency transducer which comprises a shell, a transmission shaft, blades, magnets and a vibration assembly. The first end of the transmission shaft extends out of the shell, a rotating head is fixedly arranged at the first end of the transmission shaft, a plurality of rotating rods are arranged on the rotating head in a protruding mode, and blades are arranged on the rotating rods in a sleeving mode. The magnet is arranged in the shell; the vibration assembly comprises an electromagnetic moving coil shaft sleeve, a coil and a vibration platform; the transmission shaft is sleeved with the electromagnetic moving coil shaft sleeve, and a coil is fixedly arranged on the electromagnetic moving coil shaft sleeve and located in a magnetic gap of the magnet. The electromagnetic moving coil shaft sleeve can drive the vibration platform to reciprocate on the transmission shaft, the vibration platform is located outside the shell, a connecting rod is arranged between the vibration platform and the blade, and the vibration platform can drive the blade to rotate around the rotating rod through the connecting rod. The coil is directly installed in the magnetic gap of the magnet, the distance between the coil and the magnet is short, the magnetic force borne by the coil is large, and the deflection force borne by the blade is increased.

Description

Technical Field

[0001] The utility model relates to the field of underwater acoustics, in particular to a vane type underwater low-frequency transducer. Background Art

[0002] An underwater acoustic transducer is a sound generating device that converts other energies into sound energy underwater. It is mainly applied to underwater detection, countermeasure, communication and other aspects, and the quality of its technical level will directly determine its effect. At present, most of the existing underwater low-frequency transducers are moving coil type low-frequency transducers, which rely on the Ampere force between current and magnetic field as the excitation source to drive the piston to vibrate and generate sound, and only use vibration as the source of sound energy.

[0003] Domestic research has also been done on vane type low-frequency transducers, such as vane type infrasound generating devices, which rely on the main motor to provide rotational kinetic energy. By passing alternating current into the coil, the magnet vibrates, and the magnet drives the vane to swing. However, in the above structure, the magnet is connected to the vane, the magnet is located outside the housing, the distance between the magnet and the coil is relatively far, the magnetic force received by the magnet is low, which reduces the yawing force received by the vane, and the swing amplitude and frequency of the vane are easily limited. Summary of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] The utility model provides a vane type underwater low-frequency transducer, aiming to solve the technical problem that the yawing force received by the vane in the prior art is too small.

[0006] (2) Technical Solutions

[0007] To solve the above problems, the utility model provides a vane type underwater low-frequency transducer, which comprises: a housing, a transmission shaft, vanes, a magnet and a vibration assembly;

[0008] The transmission shaft is rotatably arranged in the housing. The first end of the transmission shaft extends outside the housing, and a rotating head is fixedly arranged at the first end of the transmission shaft. A plurality of rotating rods protrude from the rotating head, the axis of the rotating rod is perpendicular to the axis of the transmission shaft, and the vanes are sleeved on the rotating rods, and the vanes can rotate relative to the rotating rods;

[0009] The magnet is fixedly arranged in the housing. The vibration assembly comprises: an electromagnetic moving coil bushing, a coil and a vibration platform; the electromagnetic moving coil bushing is sleeved on the transmission shaft, the electromagnetic moving coil bushing can slide on the transmission shaft, the coil is fixedly arranged on the electromagnetic moving coil bushing, and the coil is located in the magnetic gap of the magnet;

[0010] The electromagnetic moving coil bushing can drive the vibration platform to reciprocate on the transmission shaft. The vibration platform is located outside the housing, and a connecting rod is provided between the vibration platform and the blade. One end of the connecting rod is hinged to the blade, and the other end of the connecting rod is hinged to the vibration platform. The vibration platform can drive the blade to rotate around the rotating rod through the connecting rod.

[0011] Preferably, a front end cover is provided at the front end of the housing. An opening is provided on the front end cover, and the first end of the transmission shaft can extend out of the opening.

[0012] The vibration assembly further includes a bearing sleeve and a bearing. The bearing sleeve is slidably arranged on the transmission shaft. The electromagnetic moving coil bushing can drive the bearing sleeve to reciprocate on the transmission shaft. The inner ring of the bearing is sleeved on the bearing sleeve, and the transmission platform is sleeved on the outer ring of the bearing.

[0013] Preferably, a pressing block is provided between the electromagnetic moving coil bushing and the bearing sleeve. The pressing block is sleeved on the transmission shaft. The pressing block can slide along the transmission shaft. One end of the pressing block is fixedly connected to the vibration platform, and the other end of the pressing block is fixedly connected to the electromagnetic moving coil bushing.

[0014] Preferably, the pressing block is located at the opening of the front end cover, and a sealing ring is provided on the contact surface between the pressing block and the front end cover.

[0015] Preferably, an elastic support sheet (12) is fixedly arranged inside the housing. The electromagnetic moving coil bushing (51) is fixedly connected to the elastic support sheet (12). The electromagnetic moving coil bushing (51) can drive the elastic support sheet (12) to vibrate in the axial direction of the transmission shaft (2). The elastic support sheet (12) and the housing (1) cannot rotate relative to each other.

[0016] Preferably, the housing is a cylindrical housing with openings at both ends.

[0017] Preferably, the housing includes a vibration cylinder and a motor cylinder connected to each other.

[0018] The center line of the vibration cylinder and the center line of the motor cylinder are collinear. The front end cover is installed on the vibration cylinder. The second end of the transmission shaft and the magnet are both located inside the vibration cylinder.

[0019] A rotating motor is fixedly arranged inside the motor cylinder. The output shaft of the rotating motor can drive the transmission shaft to rotate.

[0020] Preferably, an anti-rotation groove is provided on the inner wall of the housing. The length direction of the anti-rotation groove is consistent with the axial direction of the transmission shaft.

[0021] A fixing ring is arranged inside the outer shell. The fixing ring is fixedly connected to the magnet. An anti-rotation protrusion protrudes from the fixing ring and is arranged in the anti-rotation groove.

[0022] (III) Advantageous Effects

[0023] In the utility model, both the coil and the magnet are located inside the outer shell. The coil is directly installed in the magnetic gap of the magnet. The distance between the coil and the magnet is close, and the magnetic force received by the coil is large, increasing the yaw force received by the blade. The coil is directly connected to the blade through the electromagnetic moving coil shaft sleeve, the vibration platform and the connecting rod. The swing amplitude and frequency of the blade can be controlled by controlling the frequency and magnitude of the alternating current in the coil, improving the control accuracy. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the overall structure of the blade-type underwater low-frequency transducer of the utility model;

[0025] Figure 2 is Figure 1 an enlarged view at A;

[0026] Figure 3 It is an exploded view of the blade-type underwater low-frequency transducer of the utility model;

[0027] Figure 4 It is a sectional view of the blade-type underwater low-frequency transducer of the utility model;

[0028] Figure 5 is Figure 4 an enlarged view at B.

[0029]

Description of the Reference Numerals

[0030] 1: Outer shell; 11: Front end cover; 12: Elastic support sheet; 13: Vibration cylinder; 14: Motor cylinder; 15: Motor; 16: Fixing ring; 2: Transmission shaft; 21: Rotating head; 22: Rotating rod; 23: Sealing ring; 3: Blade; 31: Connecting rod; 4: Magnet; 5: Vibration assembly; 51: Electromagnetic moving coil shaft sleeve; 52: Coil; 53: Vibration platform; 54: Bearing sleeve; 55: Bearing; 56: Pressing block. Specific Embodiments

[0031] In order to better explain the utility model for easy understanding, the following will describe the utility model in detail with reference to the drawings through specific embodiments.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In the present utility model, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] The present utility model provides a vane-type underwater low-frequency transducer. The vane-type underwater low-frequency transducer includes: a housing 1, a transmission shaft 2, vanes 3, magnets 4, and a vibration assembly 5. The transmission shaft 2 is rotatably arranged in the housing 1. The first end of the transmission shaft 2 extends outside the housing 1, and a rotating head 21 is fixedly arranged at the first end of the transmission shaft 2. A plurality of rotating rods 22 protrude from the rotating head 21. The axis of the rotating rod 22 is perpendicular to the axis of the transmission shaft 2. Vanes 3 are sleeved on the rotating rods 22, and the vanes 3 can rotate relative to the rotating rods 22. The magnet 4 is arranged in the housing 1. The vibration assembly 5 includes: an electromagnetic moving coil bushing 51, a coil 52, and a vibration platform 53. The electromagnetic moving coil bushing 51 is sleeved on the transmission shaft 2. The electromagnetic moving coil bushing 51 can slide on the transmission shaft 2. The coil 52 is fixedly arranged on the electromagnetic moving coil bushing 51, and the coil 52 is located in the magnetic gap of the magnet 4. The electromagnetic moving coil bushing 51 can drive the vibration platform 53 to slide on the transmission shaft 2. The vibration platform 53 is located outside the housing 1, and a connecting rod 31 is arranged between the vibration platform 53 and the vanes 3. One end of the connecting rod 31 is hinged to the vane 3, and the other end of the connecting rod 31 is hinged to the vibration platform 53. The vibration platform 53 can drive the vanes 3 to rotate around the rotating rods 22 through the connecting rod 31. In a preferred embodiment, the magnet 4 is a neodymium magnet 4.

[0036] When the vane - type underwater low - frequency transducer in the present utility model is working, the whole vane - type underwater low - frequency transducer is placed underwater. Then, the motor 15 drives the transmission shaft 2 to rotate, and further makes the vane 3 rotate underwater. While the vane 3 rotates underwater, alternating current is applied to the coil 52 on the electromagnetic moving - coil bushing 51. The electromagnetic moving - coil bushing 51 drives the vane 3 to deflect around the rotating rod 22 through the vibration platform 53 and the connecting rod 31, thereby generating low - frequency sound energy. When the alternating current with a frequency of 5 Hz - 20 kHz passes through the coil 52 in the electromagnetic moving - coil bushing 51, the electromagnetic moving - coil bushing 51 drives the vibration platform 53 to vibrate at the same frequency. The vibration platform 53 drives the vane 3 to vibrate through the connecting rod 31, and radiates sound waves of the same frequency outward. In the above - mentioned working process, by arranging the coil 52 on the transmission shaft 2 and setting the coil 52 in the magnetic gap of the magnet 4, when alternating current is applied to the coil 52, the coil 52 will be affected by magnetic force in the magnetic gap and reciprocate along the axial direction of the transmission shaft 2. The coil 52 drives the electromagnetic moving - coil bushing 51 to vibrate, and the electromagnetic moving - coil bushing 51 directly drives the vane 3 to vibrate through the vibration platform 53 and the connecting rod 31. Compared with the existing technology, in the present utility model, both the coil 52 and the magnet 4 are located inside the housing 1. The coil 52 is directly installed in the magnetic gap of the magnet 4. The distance between the coil 52 and the magnet 4 is close, and the magnetic force received by the coil 52 is large, increasing the deflection force received by the vane 3. The coil 52 is directly connected to the vane 3 through the electromagnetic moving - coil bushing 51, the vibration platform 53 and the connecting rod 31. The swing amplitude and frequency of the vane 3 can be controlled by controlling the frequency and magnitude of the alternating current in the coil 52, improving the control accuracy.

[0037] Further, a front end - cover 11 is provided at the front end of the housing 1. An opening is provided on the front end - cover 11, and the first end of the transmission shaft 2 can extend out of the opening. The vibration assembly 5 further includes a bearing sleeve 54 and a bearing 55. The bearing sleeve 54 is slidably arranged on the transmission shaft 2. The electromagnetic moving - coil bushing 51 can drive the bearing sleeve 54 to slide back and forth on the transmission shaft 2. The inner ring of the bearing 55 is sleeved on the bearing sleeve 54, and the transmission platform is sleeved on the outer ring of the bearing 55.

[0038] While the vane 3 vibrates, the motor 15 drives the transmission shaft 2 to rotate, and the transmission shaft 2 drives the vane 3 to rotate. The rotation of the vane 3 drives the vibration platform 53 through the connecting rod 31. The vibration platform 53 is installed on the bearing 55, thereby driving the outer ring of the bearing 55 to rotate. While the outer ring of the bearing 55 rotates, the inner ring of the bearing 55 is installed on the bearing sleeve 54, and the bearing sleeve 54 is installed on the electromagnetic moving - coil bushing 51. The electromagnetic moving - coil bushing 51 can only vibrate and cannot rotate, thus realizing the separation of vibration and rotation. Wherein the bearing 55 can be a self - aligning ball bearing 55 or a double - row angular contact ball bearing 55.

[0039] Furthermore, a pressure block 56 is provided between the electromagnetic moving coil bushing 51 and the bearing sleeve 54. The pressure block 56 is sleeved on the transmission shaft 2 and can slide along the transmission shaft 2. One end of the pressure block 56 is fixedly connected to the bearing sleeve 54, and the other end of the pressure block 56 is fixedly connected to the electromagnetic moving coil bushing 51. The pressure block 56 is located at the opening of the front end cover 11, and a sealing ring 23 is provided on the contact surface between the pressure block 56 and the front end cover 11. In a preferred embodiment, the sealing ring 23 is a star-shaped sealing ring 23 and a retaining ring, and a rotary square ring for the shaft is provided on the contact surface between the pressure block 56 and the transmission shaft 2.

[0040] A pressure block 56 is provided between the electromagnetic moving coil bushing 51 and the bearing sleeve 54, and the pressure block 56 is arranged at the opening of the front end cover 11. First, the vibration of the electromagnetic moving coil bushing 51 can be transmitted to the bearing sleeve 54 by the pressure block 56. Secondly, sealing elements are provided on the contact surface between the pressure block 56 and the front end cover 11, and on the contact surface between the pressure block 56 and the transmission shaft 2, so that when the vane type underwater low-frequency transducer works underwater, there will be no leakage inside the housing 1, ensuring the service life of the components inside the housing 1 and the normal operation of the vane type underwater low-frequency transducer.

[0041] In addition, an elastic support piece 12 is fixedly arranged inside the housing. The electromagnetic moving coil bushing 51 is fixedly connected to the elastic support piece 12. Since the elastic support piece has elasticity, the electromagnetic moving coil bushing 51 can drive the elastic support piece 12 to vibrate in the axial direction of the transmission shaft 2, and there is no relative rotation between the elastic support piece 12 and the housing 1. The elastic support piece 12 is a beryllium bronze elastic support piece 12. The setting of the elastic support piece 12 can prevent the electromagnetic moving coil bushing 51 from rotating. Specifically, the elastic support piece 12 can be fixed on the magnet 4, and four through holes for connecting with the magnet 4 are provided on the elastic support piece 12 to enable the elastic support piece 12 to offset the inertial moment on the electromagnetic moving coil bushing 51.

[0042] Finally, the housing 1 is a cylindrical housing 1 with openings at both ends. The housing 1 includes a vibration cylinder 13 and a motor cylinder 14 which are connected to each other; the center lines of the vibration cylinder 13 and the motor cylinder 14 are collinear. The front end cover 11 is installed on the vibration cylinder 13, and the second end of the transmission shaft 2 and the magnet 4 are both located inside the vibration cylinder 13; a rotary motor 15 is fixedly arranged inside the motor cylinder 14, and the output shaft of the rotary motor 15 can drive the transmission shaft 2 to rotate. The output shaft of the rotary motor 15 is connected to the transmission shaft 2 through a speed reducer.

[0043] An anti-rotation groove is provided on the inner wall of the outer shell 1, and the length direction of the anti-rotation groove is consistent with the axial direction of the transmission shaft 2; a fixing ring 13 is provided in the outer shell 1, the fixing ring 13 is fixedly connected with the magnet 4, and an anti-rotation protrusion is convexly provided on the fixing ring 13, and the anti-rotation protrusion is arranged in the anti-rotation groove. By providing an anti-rotation groove on the inner wall of the outer shell 1 and providing a corresponding anti-rotation protrusion on the fixing ring, and fixedly connecting the magnet 4 with the fixing ring, the rotation of the magnet 4 in the outer shell 1 can be restricted. Specifically, a pair of bosses can be provided on the inner wall of the outer shell 1, and the anti-rotation groove is formed between the two bosses. Then, fixing holes are provided on the side surfaces of the bosses, and fasteners are arranged in the fixing holes to abut against the anti-rotation protrusions, so that the axial displacement of the fixing ring in the outer shell can be restricted, and the fixed installation of the magnet is realized.

[0044] It should be understood that the above description of the specific embodiments of the present invention is only for explaining the technical route and features of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the above specific embodiments. Any changes or modifications made within the scope of the claims of the present invention should be covered by the protection scope of the present invention.

Claims

1. A blade-type underwater low-frequency transducer, characterized in that: The blade-type underwater low-frequency transducer comprises: a housing (1), a transmission shaft (2), blades (3), a magnet (4) and a vibration component (5); A transmission shaft (2) is rotatably arranged in the housing (1), a first end of the transmission shaft (2) extends out of the housing (1), and a rotating head (21) is fixedly arranged at the first end of the transmission shaft (2), a plurality of rotating rods (22) are protruding from the rotating head (21), the axes of the rotating rods (22) are perpendicular to the axes of the transmission shaft (2), the rotating rods (22) are sleeved with the blades (3), and the blades (3) can rotate relative to the rotating rods (22); The magnet (4) is fixedly arranged in the housing (1); the vibration component (5) comprises: an electromagnetic moving coil sleeve (51), a coil (52) and a vibration platform (53); the electromagnetic moving coil sleeve (51) is sleeved on the transmission shaft (2); the electromagnetic moving coil sleeve (51) is capable of sliding on the transmission shaft (2); the coil (52) is fixedly arranged on the electromagnetic moving coil sleeve (51), and the coil (52) is located in the magnetic gap of the magnet (4); The electromagnetic moving coil sleeve (51) can drive the vibration platform (53) to reciprocate on the transmission shaft (2); the vibration platform (53) is located outside the housing (1); and a connecting rod (31) is provided between the vibration platform (53) and the blade (3); one end of the connecting rod (31) is hinged to the blade (3); and the other end of the connecting rod (31) is hinged to the vibration platform (53); the vibration platform (53) can drive the blade (3) to rotate around the rotating rod (22) via the connecting rod (31).

2. The blade-type underwater low-frequency transducer according to claim 1, characterized in that: A front end cover (11) is provided at the front end of the housing (1), and an opening is provided on the front end cover (11), and the first end of the transmission shaft (2) can extend out of the opening; The vibration component (5) further comprises a bearing sleeve (54) and a bearing (55); the bearing sleeve (54) is slidably arranged on the transmission shaft (2); the electromagnetic moving coil sleeve (51) can drive the bearing sleeve (54) to slide back and forth on the transmission shaft (2); the inner ring of the bearing (55) is sleeved on the bearing sleeve (54); and the transmission platform is sleeved on the outer ring of the bearing (55).

3. The blade-type underwater low-frequency transducer according to claim 2, characterized in that: A pressure block (56) is provided between the electromagnetic moving coil sleeve (51) and the bearing sleeve (54); the pressure block (56) is sleeved on the transmission shaft (2); the pressure block (56) can slide along the transmission shaft (2); one end of the pressure block (56) is fixedly connected to the vibration platform (53); and the other end of the pressure block (56) is fixedly connected to the electromagnetic moving coil sleeve (51).

4. The blade-type underwater low-frequency transducer according to claim 3, characterized in that: The pressing block (56) is located at the opening of the front end cover (11), and a sealing ring (23) is provided on the contact surface between the pressing block (56) and the front end cover (11).

5. The blade-type underwater low-frequency transducer according to claim 4, characterized in that: An elastic support sheet (12) is fixedly arranged in the outer shell, and the electromagnetic moving coil sleeve (51) is fixedly connected to the elastic support sheet (12). The electromagnetic moving coil sleeve (51) can drive the elastic support sheet (12) to vibrate in the axial direction of the transmission shaft (2), and the elastic support sheet (12) and the outer shell (1) cannot rotate relative to each other.

6. The blade-type underwater low-frequency transducer according to any one of claims 1 to 5, characterized in that: The shell (1) is a cylindrical shell (1) with openings at both ends.

7. The blade-type underwater low-frequency transducer according to claim 4, characterized in that: The housing (1) comprises a vibration cylinder (13), a motor (15) and a motor cylinder (14) which are connected to each other; The center line of the vibration cylinder (13) and the center line of the motor (15) and the motor cylinder (14) are collinear, the front end cover (11) is mounted on the vibration cylinder (13), and the second end of the transmission shaft (2) and the magnet (4) are both located in the vibration cylinder (13); The motor (15) has a rotating motor (15) fixedly disposed inside the motor barrel (14), and the output shaft of the rotating motor (15) can drive the transmission shaft (2) to rotate.

8. The blade-type underwater low-frequency transducer according to any one of claims 1 to 3, characterized in that: An anti-rotation groove is provided on the inner wall of the housing (1), and the length direction of the anti-rotation groove is consistent with the axial direction of the transmission shaft (2); A fixing ring (16) is arranged inside the housing (1), the fixing ring (16) is fixedly connected to the magnet (4), an anti-rotation protrusion is protruding from the fixing ring (16), and the anti-rotation protrusion is arranged in the anti-rotation groove.

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