Micro Infrasound Generator

Abstract

The present invention discloses a miniature infrasound generator, characterized in that the device comprises: a Bluetooth module, an MCU, and a stepper motor infrasound generator. The intensity of the infrasound generated by the device is controlled by changing the stepper motor control pulse frequency or the farthest distance of the piston of the stepper motor infrasound generator, and controlling the airflow aperture and the number of openings; the frequency of the generated infrasound is changed by changing the stepper motor reversing time interval. The miniature infrasound generator has the advantages of simple working principle, simple structure, convenient manufacture, small size, and compact structure.

Description

Technical Field

[0001] The invention relates to the technical fields of circuits, motors and infrasound, in particular to a miniature infrasound generator. Background Art

[0002] Infrasound is a wave below 20Hz, which is lower than the bass hearing range of human ears. Infrasound can be used in the medical field. For example, the Infrasound 8TM and Infrasound 8000 therapeutic instruments developed by CHI in the United States can randomly emit infrasound below 90dB, and are approved by the US FDA. They have many functions such as improving microcirculation, increasing immunity, anti-inflammatory, analgesic, and sedative sleep, and are widely used in clinical practice. For another example, the α wave music sound field produced by the infrasound band and the α wave close to the brain wave and music has significant effects on improving memory and improving sleep. With the continuous deepening of the scientific community's research on infrasound, the advantages of infrasound such as long propagation distance, strong penetration ability, and no interference from the electromagnetic environment have gradually been discovered by people, and its application in industrial production, medical and health care, environmental monitoring, military and political aspects has also attracted people's attention.

[0003] A stepper motor is an electromechanical actuator that converts an electrical pulse signal into a corresponding angular displacement. Each time an electrical pulse is input, it rotates through a fixed angle. The angular displacement of a stepper motor is proportional to the number of input pulses, that is, its speed is related to the pulse frequency and step angle. By controlling the input pulse frequency and number, and the connection sequence of each phase winding of the motor, the motor's single angular displacement speed and rotation direction can be controlled. The existence of this linear relationship, coupled with the characteristics of stepper motors that only have periodic errors but no cumulative errors, makes it very simple to use stepper motors to control speed, position and other control fields. In addition, the stepper motor open-loop control system has the advantages of simple structure, stability, reliability, easy control and low cost.

[0004] The drawbacks of existing speakers and other methods of generating infrasound are that the infrasound generating device is large in size, has low transducer efficiency, and cannot be miniaturized. In particular, when using infrasound in the medical field, the existing laboratory infrasound generating devices have the problems of large structure, heavy use, complex structure, and high cost, and are not suitable for clinical operation. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a miniature infrasound generator. The miniature infrasound generator comprises: a Bluetooth module, an MCU, a stepper motor, and a screw piston infrasound generating device:

[0006] The Bluetooth module is used to communicate data with smart devices;

[0007] The MCU is used to control the stepper motor to commutate and rotate a certain angle, and provide an input and output interface;

[0008] The stepping motor is used to drive the screw rod to rotate;

[0009] The screw piston infrasound wave generating device is used to generate infrasound waves.

[0010] Preferably, the screw piston infrasound wave generating device comprises: a sleeve, a screw, a piston, an upper sleeve cover, a lower sleeve cover and an air hole:

[0011] The sleeve is used to install the piston, the micro-stepping motor, the screw rod, etc., and has top covers at both ends with small holes on the top covers;

[0012] The screw rod is used to convert the rotation of the stepping motor into the linear motion of the piston along the inner wall of the sleeve;

[0013] The piston is used to reciprocate along the inner wall of the sleeve in a straight line under the drive of the stepper motor, pushing the air to flow out or be sucked in toward the top of the sleeve, thereby generating infrasound waves;

[0014] The sleeve upper cover is used to close the top end of the sleeve;

[0015] The sleeve lower cover is used to close the bottom end of the sleeve and install the stepper motor and the lead screw;

[0016] The air hole is used to facilitate air to flow out or be sucked into the sleeve.

[0017] According to one aspect of the present invention, the screw-piston infrasound wave generating device is driven by the stepper motor to rotate, thereby driving the piston on the screw to perform linear reciprocating motion along the sleeve, thereby promoting the outflow and inhalation of air in the sleeve to generate infrasound waves.

[0018] Preferably, the piston is tightly fitted with the inner wall of the sleeve to prevent air from leaking in the opposite direction of the movement of the piston when the piston moves.

[0019] Preferably, in the infrasonic device, when the amplitude of the infrasonic wave is zero, the piston stops at the midpoint of the sleeve.

[0020] Furthermore, within the infrasonic wave cycle, the stepper motor drives the piston to move outward from the midpoint to the farthest point from the top surface of the sleeve; the piston moves back from the farthest point through the midpoint and continues to move to the closest point to the bottom of the sleeve; the piston then returns from the closest point to the midpoint, completing a cycle of vibration, and the air is pushed out or sucked into the sleeve, generating a cycle of infrasonic waves.

[0021] Furthermore, the stepper motor drives the piston to move linearly toward the top of the sleeve, reaches the farthest point, pushes out the air in the upper half of the sleeve, and generates infrasound waves in the interval [0, π / 2]; the stepper motor drives the piston to move linearly back to the midpoint, sucks air into the upper half of the sleeve, and generates infrasound waves in the interval [π / 2, π]; the stepper motor drives the piston to move beyond the midpoint and continue to move toward the bottom of the sleeve to the farthest point, continues to suck air, and generates infrasound waves in the interval [π, π3 / 2]; the stepper motor drives the piston to return to the midpoint, squeezes out the air, and generates infrasound waves in the interval [π3 / 2, 2π].

[0022] According to another aspect of the present invention, the frequency of the infrasound generated by the screw piston infrasound generating device is determined by the reversing time interval of the piston movement.

[0023] Furthermore, the frequency of the infrasound generated by the screw piston infrasound generating device is determined by the reversing time interval of the stepping motor.

[0024] Furthermore, the time length of generating one cycle of infrasound is 4T C ,[0,T C ] is started, the stepper motor is C Point reversal, at [T C ,3T C ] During the linear motion, the stepper motor then moves to 3T C Point reversal, in [3T C ,4T C ] During linear motion, the stepper motor then moves to 4T C The time point returns to the midpoint, producing a complete cycle of infrasound.

[0025] Furthermore, the frequency of the generated infrasound wave is calculated by the following formula:

[0026] f C =1 / 4T C (1)

[0027] Further, the stepping motor commutation time interval T is changed C , the infrasound frequency generated by the stepping motor infrasound wave generating device also changes accordingly.

[0028] According to another aspect of the present invention, the vibration amplitude of the screw piston infrasound wave generating device is controlled by the maximum moving distance of the piston in linear motion. The larger the maximum moving distance, the larger the vibration amplitude and the stronger the vibration energy.

[0029] Furthermore, by controlling the rotation angle of the stepper motor within an infrasound wave cycle, the maximum linear motion stroke of the piston is controlled, thereby controlling the infrasound intensity generated by the stepper motor infrasound wave generating device.

[0030] Furthermore, by increasing the number of angular displacement control pulses of the stepper motor within the infrasound wave period, the maximum rotation angle of the stepper motor can be controlled, thereby allowing the stepper motor infrasound wave generating device to generate stronger infrasound waves.

[0031] Further, the stepper motor rotation angle is calculated by the following formula:

[0032] φ=Δφ×number of control pulses (2)

[0033] Δφ is the rotation angle per unit pulse of the stepper motor.

[0034] Further, take n=N C , N C T C The maximum number of pulses during the period obtains the maximum angular displacement of the stepper motor.

[0035] Preferably, the intensity of the infrasound generated by the stepping motor infrasound wave generating device can be controlled by changing the size and diameter of the opening at the top of the sleeve.

[0036] According to another aspect of the present invention, the step MCU generates a commutation control signal and an angular displacement control pulse to control the stepper motor to commutate and rotate a certain angle within a time period.

[0037] Furthermore, the MCU changes the switching time interval T C , the frequency of one cycle of infrasound is 1 / 4T C , and changing the angular displacement control pulse frequency to flexibly control the frequency and intensity of the infrasound waves output by the infrasound generating device.

[0038] The beneficial effects of the above technical solution of the present invention are as follows:

[0039] The present invention proposes a miniature infrasound generator, in which a stepper motor drives the piston movement in the screw piston infrasound generator to generate infrasound. Compared with other existing technologies and devices, the miniature infrasound generator has the advantages of small size and simple structure. The frequency and intensity of the generated infrasound can be conveniently controlled by controlling the commutation time interval of the stepper motor and the control pulse frequency. In particular, the miniature infrasound generator can be made into the size of an earphone speaker and placed in an earphone. The miniature infrasound generator has important application value in the medical field and many scientific fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is the structural principle of the micro infrasound generator of the preferred embodiment of the present invention;

[0041] Figure 2It is the principle of generating infrasound waves by the stepping motor infrasound wave generating device of the preferred embodiment of the present invention;

[0042] Figure 3 This is the control process of the micro-infrasound wave generating device of the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic principles, basic structures and basic functions of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0044] A person skilled in the art may be aware of some variations and equivalent substitutions of the present invention, but these variations and equivalent substitutions should not be construed as exceeding the protection scope of the present invention.

[0045] Figure 1 This is the structural principle of the micro-infrasound generator of the preferred embodiment of the present invention. Figure 1 As shown, the micro-infrasound generator includes: a Bluetooth module 1, an MCU 2, and a stepper motor infrasound generator 3: the Bluetooth module 1 is used to communicate data with the smart device, receive the infrasound frequency and intensity parameters set by the smart device to the micro-infrasound generator, and the power on / off signal; the MCU 2 calculates the switching control signal time interval T according to the received infrasound frequency and intensity parameters. C , calculate the corresponding angular displacement pulse frequency according to the intensity parameter, and control the stepper motor of the stepper motor infrasound wave generator 3 to commutate and rotate a certain angle. MCU 2 provides an input and output interface; the stepper motor infrasound wave generator 3 generates infrasound waves when the stepper motor drives its piston to move. In the real-time embodiment of the present invention, after each stepper motor 3 receives a control pulse sent by 2, it rotates a fixed angle Δφ, and at a time interval T C Within , the cumulative rotation angle φ = nΔφ, n is the number of pulses, Δφ is the inherent parameter of the stepper motor; after receiving the reversing command issued by 2, the stepper motor is controlled to rotate and reverse, and the stepper motor drives the piston of the stepper motor infrasound wave generating device 3 to make reciprocating linear motion, thereby pushing the air out of the sleeve or sucking it in to generate infrasound waves. Obviously, at a fixed time interval T C By providing an angular displacement control pulse frequency, the cumulative rotation angle can be increased, thereby driving the piston to rotate at a time interval T. C The maximum displacement within the time interval T increases the intensity of the generated infrasound. C The shorter it is, the higher the frequency of the infrasound generated is, and its output frequency f C =1 / 4T C .

[0046] Figure 2 This is the principle of infrasound generation by the stepping motor infrasound generator of the preferred embodiment of the present invention. Figure 2 As shown, the stepper motor infrasound wave generating device comprises: a micro-stepping motor 21, a sleeve 22, a screw 23, a piston 24, a sleeve upper cover 25, a sleeve lower cover 27 and an air hole 16: the micro-stepping motor 21 rotates clockwise or counterclockwise by a certain angle under the control of the reversing control signal and the angular displacement pulse signal provided by the MCU 2; the screw 23 installed in the sleeve 22 rotates with the 21, driving the piston 24 to make a linear motion; when 21 rotates clockwise, 24 moves along the inner wall of 22 toward the top cover, and when 21 rotates counterclockwise, 24 moves along the inner wall of 22 toward the bottom cover; 24 reciprocates in 22, pushing air to flow out or be sucked in toward the top of the sleeve, generating infrasound waves; 25 and 27 are cover plates at both ends of the sleeve, used to close the sleeve, and 27 also has the function of installing 21 and supporting 23; 26 is an air flow hole, and the number and size of the openings can control the air flow intensity, thereby controlling the intensity of the generated infrasound waves. In order to prevent the air from leaking in the opposite direction of the piston 23 when it moves in 22, 23 and 22 must be closely matched. When there is no infrasound output, the piston 23 stops at the midpoint of the sleeve. When working, 21 first drives 23 to move in a straight line in the direction of the top of the sleeve, reaches the farthest point, pushes out the air in the upper half of the sleeve, and generates infrasound in the interval [0, π / 2]; after receiving the reversing control signal, 21 reversing drives 23 to move back in a straight line, returns to the midpoint, and sucks air into the upper half of the sleeve, generating infrasound in the interval [π / 2, π]; 23 passes the midpoint and continues to move to the farthest point at the bottom of the sleeve, continues to suck air, and generates infrasound in the interval [π, π3 / 2]; after receiving the reversing signal again, 21 reversing drives 23 back to the midpoint, squeezes out the air, and generates infrasound in the interval [π3 / 2, 2π].

[0047] Figure 3 This is the control process of the micro-infrasound wave generating device of the preferred embodiment of the present invention. Figure 3 The workflow is as follows:

[0048] S11: MCU 2 receives the infrasound frequency f set by the smart device and received by the Bluetooth module 1 C and intensity parameter P C ;

[0049] S12: According to f C Calculate T C (commutation control interval); then according to P C Calculating 2T C The number of control pulses N in the time interval C , used to control the angular displacement of the stepper motor at a specified frequency and intensity, set φ=0,N C =N C ,n=0;

[0050] S13: The motor rotates counterclockwise to move the piston 23 to the point closest to the bottom of the sleeve, φ=1 / 2Nc Δφ;

[0051] S14: Control pulse to control the stepper motor to rotate clockwise φ=φ+Δφ, n=n+1;

[0052] S15: Determine the number of control pulses, that is, the rotation step angle, n≤Nc. If it is satisfied (it has not reached the farthest point), return to S14; if it is not satisfied (it has reached the farthest point), enter S16;

[0053] S16: Motor rotation reversing, φ=0, n=0;

[0054] S17: Control pulse to control the stepper motor to rotate counterclockwise φ=φ+Δφ, n=n+1;

[0055] S18: Determine n≤N C , if satisfied, return to S17; if not satisfied (reach the farthest point in the opposite direction);

[0056] S19: φ=0, n=0, enter S20;

[0057] S20: Is it finished? If not finished (continue to generate the next infrasound wave), return to S14; if finished, enter S21;

[0058] S21: The motor rotates clockwise at an angle φ=1 / 2N C Δφ, returns to the midpoint, and the piston 23 returns to the origin;

[0059] S22: End.

[0060] With the above embodiments of the present invention as inspiration, through the above description, relevant staff can make various changes and modifications without departing from the technical concept of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A miniature infrasound generator, It is characterized in that The micro infrasound generator comprises: a Bluetooth module, an MCU, a micro stepping motor, and a screw piston infrasound generating device, wherein: the Bluetooth module is used for data communication with the intelligent control device; The MCU is used to control the rotation and commutation of the micro stepper motor; The screw-piston infrasound wave generating device is used to generate infrasound waves, and comprises: a sleeve, a screw, a piston, an upper sleeve cover, a lower sleeve cover and an air hole opened on the upper sleeve cover; The sleeve is used to install the piston, the micro-stepping motor, and the lead screw; The air holes are used to facilitate air to flow out of or be sucked into the sleeve. By changing the number and diameter of the air holes on the top cover of the sleeve, the intensity of the infrasound generated by the screw piston infrasound wave generating device can be controlled; The micro-stepping motor is used to drive the screw to rotate, and drive the piston on the screw to perform linear reciprocating motion along the sleeve, thereby promoting the outflow and inhalation of air in the sleeve to generate infrasound waves.

2. According to the micro-infrasound generator of claim 1, It is characterized in that The screw-piston infrasound wave generating device is driven by the rotation of the micro-stepping motor to drive the piston on the screw to make linear motion in the sleeve, thereby pushing the air in the sleeve to be squeezed out or sucked in to generate infrasound waves.

3. According to the micro infrasound generator of claim 1, It is characterized in that The micro stepping motor completes rotational commutation and rotation of a certain angle under the control of the commutation control signal and the angular displacement pulse control signal.

4. The micro infrasound generator according to claim 1, It is characterized in that The micro-stepping motor drives the piston to move outward in a straight line to reach the farthest point, generating infrasound waves in the interval [0, π / 2]; the micro-stepping motor drives the piston to move back in a straight line to return to the midpoint, generating infrasound waves in the interval [π / 2, π]; the stepping motor drives the piston to move beyond the midpoint and continue to move toward the bottom of the sleeve to the farthest point, generating infrasound waves in the interval [π, π3 / 2]; the stepping motor drives the piston to return to the midpoint, generating infrasound waves in the interval [π3 / 2, 2π].

5. The micro infrasound generator according to claim 1, It is characterized in that The frequency of the infrasound waves generated by the device is determined by the rotation reversing time interval of the micro-stepping motor. The shorter the reversing time interval, the higher the frequency of the infrasound waves generated.

6. The micro infrasound generator according to claim 1, It is characterized in that The amplitude of the infrasound generated by the device is controlled by the maximum distance moved by the piston within the reversing time interval. The greater the moving distance, the greater the vibration amplitude and the stronger the radiation energy. By controlling the rotation angle of the micro-stepping motor within an infrasound cycle, the maximum linear movement stroke of the piston can be controlled, thereby controlling the infrasound intensity generated by the micro-infrasound generator.

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