A low-frequency and small-volume motor-type transducer

Abstract

The present invention discloses a low-frequency small-volume motor-type transducer, which relates to the field of transducers, including an upper shell, etc. The upper shell is fixed on the lower shell, a support plate is arranged in the lower shell, a servo motor is fixedly installed on the lower surface of the support plate, the motor shaft of the servo motor passes through the support plate and is connected to drive the small bevel gear shaft, and the large bevel gear is set on the large bevel gear shaft; a front cover plate is arranged on the top of the upper shell, a front cover plate connecting seat is respectively installed on both sides of the bottom of the front cover plate, a connecting shaft extends from the front cover plate connecting seat, a driving wheel is respectively installed at both ends of the large bevel gear shaft, an eccentric shaft is arranged on the end of the driving wheel away from the large bevel gear shaft, and the connecting rod and the front cover plate reciprocate up and down under the drive of the eccentric shaft. The present invention occupies a small space, and is sealed as a whole, and can be used in different water depths with pressure compensation; it adopts motor drive, and the transmission structure is simple. In actual use, it only needs to set the frequency of the frequency converter to start, and it is convenient to use.

Description

Technical Field

[0001] The invention relates to the field of transducers, and in particular to a low-frequency and small-volume motor-type transducer. Background Art

[0002] An electric transducer is an underwater low-frequency transmitting transducer. At present, electric transducers can be divided into two types according to the driving method, one is electromagnetic and the other is motor. The electromagnetic transducer is also called a moving coil transducer. The coil of this type of transducer is fixedly connected to the radiating surface. When current passes through the coil, the coil will generate a magnetic field, which will interact with the fixed magnet and drive the radiating surface to vibrate. When using an electromagnetic transducer, a signal source and a power amplifier are generally required, and the system composition is complex. The motor transducer is a transducer that uses an electric motor as a driving method. It has a simple structure and can generally achieve very low frequency and high power transmission.

[0003] CN107731218A discloses a reciprocating underwater very low frequency sound source. The device replaces the lower end of an electric rammer with a vibrating rod and a piston. The crankshaft, speed reduction mechanism, spring, etc. of the electric rammer motor are used to convert the rotational motion of the motor into the linear reciprocating motion of the vibrating rod and the piston, and the piston is pushed to reciprocate periodically underwater, thereby generating a very low frequency sound wave signal. The motor and transmission part of the entire device are covered with a shell to block the sound. There are two air bags at the bottom of the shell. The buoyancy generated by the air bags makes the entire device float on the water surface. The piston is placed in the water, and the reciprocating motion generates vibration. Although the device is driven by a motor, it is large in size and completely closed, and cannot work at different depths underwater. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a low-frequency, small-volume motor-type transducer having the advantages of small size and light weight.

[0005] The objective of the present invention is achieved through the following technical solutions: this low-frequency, small-volume motor-type transducer comprises an upper shell, a lower shell, a bottom cover plate, a pressure-compensating airbag, a servo motor, a support plate and a guide rod, wherein the upper shell is fixed on the lower shell, the support plate is arranged in the lower shell, a servo motor is fixedly mounted on the lower surface of the support plate, the motor shaft of the servo motor passes through the support plate and is connected to drive a small bevel gear shaft, the small bevel gear shaft is supported on the support plate by a small bevel gear bracket, the small bevel gear sleeved on the small bevel gear shaft is meshed with a large bevel gear for transmission, the large bevel gear is sleeved on the large bevel gear shaft, and the large bevel gear shaft is supported on the support plate by a large bevel gear shaft bracket; a front cover plate is provided on the top of the upper shell, and a front cover plate connecting seat is installed on each of the two sides of the bottom of the front cover plate A connecting shaft extends from the front cover connecting seat, a driving wheel is installed at each end of the large bevel gear shaft, an eccentric shaft is provided on the end of the driving wheel that is away from the large bevel gear shaft, one end of the connecting rod is installed on the connecting shaft, and the other end of the connecting rod is installed on the eccentric shaft. The connecting rod and the front cover make reciprocating motion up and down driven by the eccentric shaft; one end of the guide rod is fixed to the bottom of the front cover, and the other end of the guide rod is slidably set in the linear bearing, and the two are arranged coaxially to ensure that the front cover always reciprocates along a straight line; the bottom of the lower shell is sealed and installed with a bottom cover, and a pressure compensation airbag is fixed on the bottom cover, and the air outlet of the pressure compensation airbag passes through the bottom cover and is connected with the inner cavity of the lower shell, which is used to balance the internal and external pressures of the transducer and realize operation in different water depth environments.

[0006] As a further technical solution, the bottom of the upper shell and the top of the lower shell are sealed by an O-ring A, and the bottom of the lower shell and the bottom cover are sealed by an O-ring B; a front cover sealing rubber is provided on the top of the upper shell to seal the upper shell and the front cover.

[0007] As a further technical solution, an annular step is provided on the inner wall of the lower shell, and the support plate is fixed on the annular step by means of threads.

[0008] As a further technical solution, a motor feedback signal watertight connector and a motor drive signal watertight connector are installed on the outer wall of the lower shell, and a corresponding signal jack is also provided on the drive motor for electrically connecting to an external servo driver to realize control of the servo motor; an inflation valve is also provided on the outer wall of the lower shell, and the inflation valve is connected to the air outlet of the pressure compensating airbag for inflating high-pressure gas into the pressure compensating airbag.

[0009] As a further technical solution, a bottom plate is provided directly below the bottom cover plate, and a plurality of protection rods are provided along the circumference between the bottom plate and the bottom cover plate, so that the pressure compensation airbag is located in the space surrounded by the protection rods to form protection.

[0010] As a further technical solution, the large bevel gear is connected to the large bevel gear shaft via a flat key B and is locked and fixed with a locking nut to prevent circumferential rotation; the small bevel gear is connected to the small bevel gear shaft via a flat key A.

[0011] As a further technical solution, the large bevel gear shaft is supported on the large bevel gear shaft bracket through bearing B, and the small bevel gear shaft is supported on the small bevel gear bracket through bearing A; the motor shaft of the servo motor is connected to the small bevel gear shaft through an elastic coupling for transmission.

[0012] As a further technical solution, the driving wheel is connected to the large bevel gear shaft via a key and is stopped and fixed by a baffle A to prevent circumferential rotation.

[0013] As a further technical solution, one end of the connecting rod is supported on the eccentric shaft through a bearing C and fixed by a baffle B and a stop nut; the other end of the connecting rod is supported on the connecting shaft through a bearing C.

[0014] As a further technical solution, the bottom of the linear bearing is fixed on the upper bracket, and the two sides of the upper bracket are supported on the support plate through side brackets.

[0015] The beneficial effects of the present invention are: it occupies a small space, is sealed as a whole, and can be used in different water depths with pressure compensation; it is driven by a motor, has a simple transmission structure, and in actual use, it only needs to set the frequency of the inverter to start, which is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 for Figure 1 AA section view.

[0018] Figure 3 for Figure 2 BB cross-sectional view.

[0019] Figure 4 This is the structural front view of the driving wheel.

[0020] Figure 5 It is the structural side view of the driving wheel.

[0021] Figure 6 This is the structural front view of the front cover connecting seat.

[0022] Figure 7 This is a structural side view of the front cover connecting seat.

[0023] Description of the accompanying drawings: upper shell 1, lower shell 2, bottom cover 3, O-type rubber ring A4, O-type sealing ring B5, front cover sealing rubber 6, pressure compensation airbag 7, motor feedback signal watertight connector 8, motor drive signal watertight connector 9, inflation valve 10, protection rod 11, servo motor 12, support plate 13, small bevel gear shaft 14, elastic coupling 15, bearing A16, small bevel gear bracket 17, small bevel gear 18, flat key A1 9. Large bevel gear 20, large bevel gear shaft 21, flat key B22, locking nut 23, large bevel gear shaft bracket 24, bearing B25, driving wheel 26, key 27, baffle A28, eccentric shaft 29, connecting rod 30, bearing C31, stop nut 32, baffle B33, front cover connecting seat 34, connecting shaft 35, guide rod 36, linear bearing 37, upper bracket 38, side bracket 39, front cover 40, signal jack 41, bottom plate 42. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings:

[0025] Example: As attached Figures 1 to 7 As shown, this low-frequency small-volume motor transducer includes an upper shell 1, a lower shell 2, a bottom cover plate 3, a pressure compensation airbag 7, a servo motor 12, a support plate 13 and a guide rod 36. The upper shell 1 is fixed on the lower shell 2, the support plate 13 is arranged in the lower shell 2, an annular step is provided on the inner wall of the lower shell 2, and the support plate 13 is fixed on the annular step by threads. A servo motor 12 is fixedly mounted on the lower surface of the support plate 13. The motor shaft of the servo motor 12 passes through the support plate 13 and is connected to drive the small bevel gear shaft 14. The small bevel gear shaft 14 is supported on the support plate 13 by a small bevel gear bracket 17. The small bevel gear 18 mounted on the small bevel gear shaft 14 is meshed with the large bevel gear 20 for transmission. The large bevel gear 20 is mounted on the large bevel gear shaft 21, and the large bevel gear shaft 21 is supported on the support plate 13 by a large bevel gear shaft bracket 24; the large bevel gear 20 is connected to the large bevel gear shaft 21 through a flat key B22, and is locked and fixed with a locking nut 23 to prevent circumferential rotation. The small bevel gear 18 is connected to the small bevel gear shaft 14 through a flat key A19. Preferably, the large bevel gear shaft 21 is supported on the large bevel gear shaft bracket 24 through a bearing B25 (deep groove ball bearing), and the small bevel gear shaft 14 is supported on the small bevel gear bracket 17 through a bearing A16 (tapered roller bearing); the motor shaft of the servo motor 12 is connected to the small bevel gear shaft 14 for transmission through an elastic coupling 15.

[0026] A front cover plate 40 is provided on the top of the upper shell 1, and a front cover plate connecting seat 34 is installed on both sides of the bottom of the front cover plate 40. A connecting shaft 35 extends from the front cover plate connecting seat 34. A driving wheel 26 is installed at each end of the large bevel gear shaft 21. The driving wheel 26 is connected to the large bevel gear shaft 21 through a key 27 and is stopped and fixed by a baffle A28 to prevent circumferential rotation. An eccentric shaft 29 is provided on the end of the driving wheel 26 that is away from the large bevel gear shaft 21, one end of the connecting rod 30 is mounted on the connecting shaft 35, and the other end of the connecting rod 30 is mounted on the eccentric shaft 29. The connecting rod 30 and the front cover plate 40 reciprocate up and down under the drive of the eccentric shaft 29; one end of the guide rod 36 is fixed to the bottom of the front cover plate 40, and the other end of the guide rod 36 is slidably arranged in the linear bearing 37, and the two are arranged coaxially to ensure that the front cover plate 40 always reciprocates along a straight line; the bottom of the linear bearing 37 is fixed to the upper bracket 38, and the two sides of the upper bracket 38 are supported on the support plate 13 through the side brackets 39. Preferably, one end of the connecting rod 30 is supported on the eccentric shaft 29 through the bearing C31 (deep groove ball bearing), and is fixed with the baffle B33 and the stop nut 32; the other end of the connecting rod 30 is supported on the connecting shaft 35 through the bearing C31.

[0027] The bottom of the lower housing 2 is sealed with a bottom cover plate 3, and the pressure compensation airbag 7 is fixed on the bottom cover plate 3. The air outlet of the pressure compensation airbag 7 passes through the bottom cover plate 3 and communicates with the inner cavity of the lower housing 2, which is used to balance the internal and external pressures of the transducer and achieve operation in different water depth environments. Preferably, a bottom plate 42 is provided directly below the bottom cover plate 3, and a plurality of protection rods 11 are provided along the circumference between the bottom plate 42 and the bottom cover plate 3, so that the pressure compensation airbag 7 is located in the space surrounded by the protection rods 11 to form protection.

[0028] Preferably, the bottom of the upper shell 1 and the top of the lower shell 2 are sealed by an O-ring A4, and the bottom of the lower shell 2 and the bottom cover 3 are sealed by an O-ring B5; a front cover sealing rubber 6 is provided on the top of the upper shell 1 to seal the upper shell 1 and the front cover 40.

[0029] Preferably, a motor feedback signal watertight connector 8 and a motor drive signal watertight connector 9 are installed on the outer wall of the lower shell 2, and a corresponding signal jack 41 is also provided on the drive motor 12 for electrically connecting to an external servo driver to control the servo motor 12; an inflation valve 10 is also provided on the outer wall of the lower shell 2, and the inflation valve 10 is connected to the air outlet of the pressure compensation airbag 7 for inflating high-pressure gas into the pressure compensation airbag 7.

[0030] The working principle of the present invention is as follows: during operation, the servo motor 12 rotates to drive the small bevel gear 18 to rotate, and the small bevel gear 18 drives the large bevel gear 20 to rotate, and the reduction ratio between the small bevel gear 18 and the large bevel gear 20 is 2:1. The rotation of the large bevel gear 20 drives the large bevel gear shaft 21 to rotate, and then drives the driving wheels 26 at both ends of the large bevel gear shaft 21 to rotate. Since the shaft on the driving wheel 26 is an eccentric shaft 29, the rotation of the driving wheel 26 will drive the connecting rod 30 to perform periodic reciprocating motion. The other end of the connecting rod 30 is connected to the front cover plate 40, thereby driving the front cover plate 40 to perform periodic motion of up and down displacement, generating sound waves, and the frequency of the sound waves is 0-60Hz. The displacement amplitude of the front cover plate 40 is plus or minus 11mm. The front cover plate 40 performs linear motion under the restriction of the guide mechanism composed of the guide rod 36, the linear bearing 37, the upper bracket 38, and the side bracket 39. The lower shell 2 is equipped with a watertight connector 9 for motor drive signals and a watertight connector 8 for motor feedback signals, which are connected to the servo driver on the water surface to realize the control of the servo motor 12. An inflation valve 10 is installed on the lower shell 2, and an air hole is opened in the center of the bottom cover plate 3 to connect with the pressure compensation airbag 7. The protection rod 11 plays the role of protecting the pressure compensation airbag 7. According to the working water depth of the transducer, a specific pressure is charged to the transducer through the inflation valve 10 to realize pressure compensation, so that the transducer can work at different water depths.

[0031] Take an electric transducer with an operating frequency of 20Hz to 500Hz and a sound source level of 164dB as an example. When the transducer is working, the coil can provide a Lorentz force of about 540N, the diameter of the radiation surface is about 200mm, the maximum stroke is ±11mm, and the weight is about 35kg. If driven by a motor, the servo motor has a power of 2KW, a rated speed of 3000r / min, a rated torque of 6.4N·m, and a weight of 4KG. From the power perspective, when the electro-mechanical conversion efficiency is 90% and the vibration displacement is 1±11mm, the 2000W motor can provide a maximum thrust of not less than 1300N. From the torque perspective, for a rated torque of 6.4N·m, when the maximum displacement is ±11mm, it can be roughly calculated that the thrust at 20Hz can reach 3000 / 1200*100*6.4=1600N. From the above calculations, it can be seen that the motor-type transducer has a greater advantage in smaller size and weight.

[0032] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and inventive concept of the present invention should fall within the protection scope of the claims attached to the present invention.

Claims

1. A low-frequency, small-volume electromechanical transducer, characterized in that: The invention comprises an upper shell (1), a lower shell (2), a bottom cover plate (3), a pressure compensation airbag (7), a servo motor (12), a support plate (13) and a guide rod (36), wherein the upper shell (1) is fixed on the lower shell (2), the support plate (13) is arranged in the lower shell (2), the servo motor (12) is fixedly mounted on the lower surface of the support plate (13), the motor shaft of the servo motor (12) passes through the support plate (13) and is connected to drive a small bevel gear shaft (14), and the small bevel gear shaft (14) is connected to the small bevel gear shaft (14) by a small The bevel gear bracket (17) is supported on the support plate (13), the small bevel gear (18) mounted on the small bevel gear shaft (14) meshes with the large bevel gear (20) for transmission, the large bevel gear (20) is mounted on the large bevel gear shaft (21), and the large bevel gear shaft (21) is supported on the support plate (13) by the large bevel gear shaft bracket (24); the top of the upper housing (1) is provided with a front cover plate (40), and a front cover plate connecting seat (34) is installed on both sides of the bottom of the front cover plate (40), and the front cover plate connecting seat ( A connecting shaft (35) extends from the front cover (40), a driving wheel (26) is installed at each end of the large cone gear shaft (21), an eccentric shaft (29) is provided on the driving wheel (26) at one end away from the large cone gear shaft (21), one end of the connecting rod (30) is installed on the connecting shaft (35), and the other end of the connecting rod (30) is installed on the eccentric shaft (29), and the connecting rod (30) and the front cover (40) are driven by the eccentric shaft (29) to make up and down reciprocating motion; one end of the guide rod (36) is fixed to the front cover The bottom of the lower housing (40) is provided with a guide rod (36) at its other end which is slidably disposed in a linear bearing (37). The two are arranged coaxially to ensure that the front cover plate (40) always reciprocates along a straight line. The bottom of the lower housing (2) is sealed with a bottom cover plate (3). The pressure compensation airbag (7) is fixed on the bottom cover plate (3). The air outlet of the pressure compensation airbag (7) passes through the bottom cover plate (3) and is connected to the inner cavity of the lower housing (2) to balance the internal and external pressures of the transducer and realize operation in different water depth environments. An annular step is provided on the inner wall of the lower shell (2), and the support plate (13) is fixed on the annular step by means of threads; A motor feedback signal watertight connector (8) and a motor drive signal watertight connector (9) are mounted on the outer wall of the lower housing (2); a corresponding signal jack (41) is also provided on the drive motor (12) for electrically connecting to an external servo driver to control the servo motor (12); an inflation valve (10) is also provided on the outer wall of the lower housing (2); the inflation valve (10) is communicated with the gas outlet of the pressure compensation airbag (7) and is used to inflate high-pressure gas into the pressure compensation airbag (7); A bottom plate (42) is provided directly below the bottom cover plate (3), and a plurality of protection rods (11) are provided along the circumference between the bottom plate (42) and the bottom cover plate (3), so that the pressure compensation airbag (7) is located in a space surrounded by the protection rods (11) to provide protection.

2. The low-frequency and small-volume electromechanical transducer according to claim 1, characterized in that: The bottom of the upper shell (1) and the top of the lower shell (2) are sealed by an O-type rubber ring A (4), and the bottom of the lower shell (2) and the bottom cover plate (3) are sealed by an O-type sealing ring B (5); a front cover plate sealing rubber (6) is provided at the top of the upper shell (1) to seal the upper shell (1) and the front cover plate (40).

3. The low-frequency and small-volume electromechanical transducer according to claim 1, characterized in that: The large bevel gear (20) is connected to the large bevel gear shaft (21) via a flat key B (22) and is locked and fixed by a locking nut (23) to prevent circumferential rotation; the small bevel gear (18) is connected to the small bevel gear shaft (14) via a flat key A (19).

4. The low-frequency and small-volume electromechanical transducer according to claim 1, characterized in that: The large bevel gear shaft (21) is supported on the large bevel gear shaft bracket (24) via a bearing B (25), and the small bevel gear shaft (14) is supported on the small bevel gear bracket (17) via a bearing A (16); the motor shaft of the servo motor (12) is connected to the small bevel gear shaft (14) for transmission via an elastic coupling (15).

5. The low-frequency and small-volume electromechanical transducer according to claim 1, characterized in that: The driving wheel (26) is connected to the large bevel gear shaft (20) via a key (27) and is stopped and fixed by a baffle A (28) to prevent circumferential rotation.

6. The low-frequency and small-volume electromechanical transducer according to claim 1, characterized in that: One end of the connecting rod (30) is supported on the eccentric shaft (29) via a bearing C (31) and is fixed by a baffle B (33) and a stop nut (32); the other end of the connecting rod (30) is supported on the connecting shaft (35) via a bearing C (31).

7. The low-frequency and small-volume electromechanical transducer according to claim 1, characterized in that: The bottom of the linear bearing (37) is fixed on the upper bracket (38), and the two sides of the upper bracket (38) are supported on the support plate (13) through side brackets (39).

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