Electromagnetic vibration radiator and working method thereof

Abstract

The invention relates to an electromagnetic vibration radiator. The radiator comprises a shell, an airflow box and an electromagnetic vibration unit, an air filter membrane is mounted at a top opening of the shell; the airflow box is mounted on the bottom surface in the shell; the airflow box comprises a top cavity and a bottom cavity which are sequentially arranged from top to bottom; the top cavity and the bottom cavity are separated by a separation plate; and a plurality of air nozzles which are uniformly distributed and are used for communicating the top cavity with the bottom cavity are formed in the isolation plate. The electromagnetic vibration unit comprises two bases arranged at an interval and an electromagnetic vibration main body mounted between the two bases; the electromagnetic vibration body comprises a first printing coil, a first high-permeability elastic metal sheet, a second printing coil and a second high-permeability elastic metal sheet which are sequentially overlapped and transversely arranged between the two bases from top to bottom. The electromagnetic vibration technology is adopted to drive the high-permeability elastic metal sheet to move, air suction and air exhaust are carried out in the miniature radiator, and therefore the cooling effect is achieved for a target heat source.

Description

Technical Field

[0001] The invention relates to the technical field of air cooling and heat dissipation, and in particular to an electromagnetic vibration radiator and a working method thereof. Background Art

[0002] Conventional air cooling usually requires the use of a fan and is not suitable for cooling in a small space. Piezoelectric heat sinks using piezoelectric ceramics can be used for air cooling in a small space, but the piezoelectric ceramics and their associated circuits need to be mounted on a vibrator and follow the high-frequency movement of the vibrator, and there is a problem of falling off and failure during long-term operation.

[0003] The existing piezoelectric heat sink uses the piezoelectric ceramic to generate deformation when it is energized, which drives the high magnetic elastic metal sheet to bend up and down to generate vibration. The piezoelectric ceramic sheet is glued to the middle of the high magnetic elastic metal sheet with glue. When the piezoelectric heat sink works for a long time, there is a problem of heat dissipation failure caused by the glue of the piezoelectric ceramic sheet falling off due to vibration. Moreover, when the piezoelectric heat sink works for a long time, the power lead of the piezoelectric ceramic sheet bonded to the middle of the high magnetic elastic metal sheet is bent and disconnected due to vibration, resulting in heat dissipation failure. At room temperature, when the piezoelectric ceramic sheet works at a humidity below 40%, its service life can reach more than 1 billion times (continuous working time is about 232 days). When working at a humidity above 40%, its service life is within 1 billion times. Therefore, the piezoelectric heat sink has the problem of reduced working life due to high humidity. At room temperature, the piezoelectric ceramic sheet is affected by the adhesion of conductive dust, and there is a problem of heat dissipation failure due to problems such as leakage sparking and short circuit. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, an object of the present invention is to provide an electromagnetic vibration radiator and a working method thereof.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An electromagnetic vibration radiator comprises a shell, an airflow box installed in the shell and an electromagnetic vibration unit installed in the airflow box; an air filter membrane is installed at the top opening of the shell; the airflow box is installed on the bottom surface inside the shell; the airflow box comprises a top cavity and a bottom cavity arranged in sequence from top to bottom; the top cavity and the bottom cavity are separated by an isolation plate; and a plurality of evenly distributed air jets for connecting the top cavity and the bottom cavity are arranged on the isolation plate.

[0007] The electromagnetic vibration unit is located in the top cavity; the electromagnetic vibration unit includes two spaced bases and an electromagnetic vibration body installed between the two bases; the electromagnetic vibration body includes a first printed coil, a first high magnetic elastic metal sheet, a second printed coil and a second high magnetic elastic metal sheet, which are overlapped and placed horizontally between the two bases from top to bottom. The printed coil and the high magnetic elastic metal reed sheet have a phase angle difference of 180 degrees. ° The suction and ejection actions are driven by a half-sine wave signal.

[0008] The number of the electromagnetic vibration units is the same as the number of the air jets, and the two are arranged in a one-to-one correspondence; the base is installed on the isolation plate; and the electromagnetic vibration body is located above the air jets.

[0009] A sinusoidal alternating voltage and a half-wave rectified voltage are applied to the first brush coil and the second printed coil respectively, and the voltage phase angles differ by 180°, so as to form a magnetic field around the first brush coil and the second printed coil. Under the action of the magnetic field, the first high magnetic permeability elastic metal sheet and the second high magnetic permeability elastic metal sheet move to form an air suction and air ejection action to achieve heat dissipation.

[0010] Preferably according to the present invention, one end of the housing is provided with a slope, and the end provided with the slope has a hot air outlet.

[0011] Preferably according to the present invention, an opening is arranged at the top of the top cavity, and a cover plate is installed at the opening; the cover plate is used to enclose the top cavity.

[0012] Preferably according to the present invention, an air inlet groove is provided on the cover plate.

[0013] Preferably according to the present invention, the right side and the bottom side of the bottom cavity are respectively formed by the inner surface of the bottom surface of the shell and the inner surface of the right side side, and a vent is provided on the left side of the bottom cavity.

[0014] Preferably, according to the present invention, the first high magnetic elastic metal sheet and the second high magnetic elastic metal sheet both have high magnetic permeability; the first high magnetic elastic metal sheet and the second high magnetic elastic metal sheet are both made of iron-cobalt-vanadium soft magnetic alloy material. The bottom surface of the shell is made of high thermal conductivity material, and the bottom surface of the shell is made of oxygen-free copper material.

[0015] Preferably, according to the present invention, the bases of the various electromagnetic vibration units are evenly arranged on the isolation plate.

[0016] Preferably according to the present invention, surfaces of the first printed coil and the second printed coil are coated with conformal coating.

[0017] Preferably according to the present invention, the surfaces of the first high magnetic elastic metal sheet and the second high magnetic elastic metal sheet are plated with a nickel layer.

[0018] The present invention also includes a working method of the electromagnetic vibration radiator, the method comprising the following steps:

[0019] S1. A sinusoidal alternating voltage and a half-wave rectified voltage are applied to the first printed coil and the second printed coil of each electromagnetic vibration unit respectively. The voltage phases of the two printed coils differ by 180 degrees, and a magnetic field is formed between the two energized printed coils.

[0020] S2. Under the magnetic field created by the two energized printed coils, the first high magnetic elastic metal sheet and the second high magnetic elastic metal sheet undergo periodic deformation.

[0021] In the first stage of each periodic deformation, when the first printed coil is energized, the first high magnetic elastic metal sheet bends downward, and as the voltage changes, the bending degree of the first high magnetic elastic metal sheet changes synchronously, low air pressure appears above the first high magnetic elastic metal sheet, and the outside air is attracted into the top cavity of the air flow box through the air filter membrane and the air inlet groove on the cover plate in turn, and high air pressure appears below the first high magnetic elastic metal sheet; the entire top of the first high magnetic elastic metal sheet will be affected, and as time changes, the pressure decreases and is transmitted from the inside to the outside, driving the air flow to be sucked in from the top.

[0022] At the same time, the second printed coil is connected to a reverse voltage, the second high magnetic elastic metal sheet is bent upward, and the outside air entering the top cavity forms high-pressure air above the second high magnetic elastic metal sheet. The high-pressure air first flows out to the bottom cavity through the air jet on the isolation plate, and then is ejected to the inner surface of the bottom of the shell through the air vent on the bottom cavity. The high-pressure air ejected to the inner surface of the bottom of the shell absorbs the heat from the external heat source and transfers it to the bottom of the shell, and then flows out to the external environment from the hot air outlet of the shell;

[0023] In the second stage of each periodic deformation, the first printed coil remains energized, and the voltage is opposite to the voltage applied in the first stage. The first high magnetic permeability elastic metal sheet bends upward, and the degree of bending of the first high magnetic permeability elastic metal sheet changes synchronously with the voltage. The outside air introduced in the first stage fills the area below the first high magnetic permeability metal sheet. When the second printed coil is de-energized, the second high magnetic permeability elastic metal sheet of each electromagnetic vibration unit blocks the air outlet on the isolation plate.

[0024] Compared with the prior art, the advantages of the present invention are:

[0025] (1) The present invention uses electromagnetic vibration technology to drive the high magnetic elastic metal sheet to move, and performs air suction and exhaust in the micro radiator, thereby achieving a cooling effect on the target heat source. By changing the circuit parameters of the driving component, the vibration working condition of the moving component can be flexibly adjusted. In addition, the moving component (the moving component refers to the high magnetic elastic metal sheet) and the driving component (printed coil) are spatially isolated, which greatly eliminates the risk of failure of the heat dissipation unit. At the same time, separate manufacturing reduces the difficulty of production. The circuit parameters mainly include waveform, voltage and frequency. The suction volume needs to be adjusted according to the working conditions. Changes in circuit parameters cause changes in vibration parameters, thereby changing the suction volume.

[0026] (2) The piezoelectric heat sink in the prior art uses the principle of the inverse piezoelectric effect, that is, when an alternating voltage is applied to the piezoelectric ceramic, the deformation of the piezoelectric ceramic element realizes the up and down bending vibration of the high magnetic elastic metal sheet. The electromagnetic vibration heat sink in the present invention uses the Lorentz force generated when an alternating voltage is applied to a multi-turn printed coil to attract the high magnetic elastic metal sheet to produce up and down bending vibration, and there are no adhesive excitation elements and energized leads on the high magnetic elastic metal sheet. In this way, the problems of adhesive peeling and lead bending and disconnection caused by vibration are avoided from the source. The surface of the printed coil is coated with a three-proof paint, and the surface of the high magnetic elastic metal sheet is nickel-plated for rust prevention, which effectively solves the problems caused by humidity, conductive dust contamination, etc.

[0027] (3) The present invention uses two printed coils as the excitation method, alternately attracting the high magnetic elastic metal sheet fixed on the base to produce micro vibration, thereby producing a wind-cooled heat dissipation effect. Two sets of printed coils and two sets of high magnetic elastic metal reed structures are used. Through the two sets of phase angles differing by 180 ° Driven by a half-sine wave signal, the air suction and air ejection actions of two sets of high magnetic permeability elastic metal sheets are realized.

[0028] (4) The present invention solves the problem of adhesive peeling and lead bending and disconnection caused by vibration of adhesive excitation elements and power leads in traditional piezoelectric radiators, thereby increasing working reliability. In the prior art, Chinese patent document CN104654873A discloses a new electromagnetic synthetic jet radiator, and Chinese patent document CN105159424A discloses a heat dissipation structure, a heat dissipation method, a device and a mobile device. Both of the above documents are provided with a diaphragm as an element, and a moving part is placed on the diaphragm to drive the diaphragm to operate. The obvious substantive difference from the above two documents is that the present invention uses a high-magnetic-conductivity elastic metal sheet to replace these two elements at the same time. The advantage of this treatment is that the moving parts are single, there is no risk of disintegration and failure under high-frequency movement, and it is also easy to produce. In addition, the present invention uses two high-magnetic-conductivity elastic metal sheets instead of one diaphragm, and the double vibration enhances the efficiency of suction and ejection. Moreover, the application scenarios of the present invention and the two patent documents are different. The device structures of the two patent documents determine that they cannot be miniaturized. The present invention can be applied to miniaturized application scenarios. A large number of jet nozzles are formed by a large number of small electromagnetic vibration units, which can be directly attached to the hot surface for easy installation. It can be used for air cooling in a small space. Typical application scenarios include heat dissipation of chips and various electronic components with high heat flux density. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the electromagnetic vibration radiator in the present invention;

[0030] Figure 2 It is a structural schematic diagram of the electromagnetic vibration unit.

[0031] in:

[0032] 1. air filter membrane, 2. housing, 3. cover plate, 4. air flow box, 5. electromagnetic vibration unit, 501. first printed coil, 502. first high magnetic elastic metal sheet, 503. second high magnetic elastic metal sheet, 504. second printed coil, 505. base. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings:

[0034] like Figure 1 An electromagnetic vibration radiator is shown, which includes an air filter membrane 1, a housing 2, a cover plate 3, an air flow box 4 and an electromagnetic vibration unit 5.

[0035] like Figure 1As shown, an air filter membrane 1 is arranged at the top opening of the shell 2 shaped like a flat box, an inclined surface is arranged on the left side of the shell 2, and a hot air outlet is arranged on the shell 2 below the inclined surface, and the remaining side surfaces and bottom surfaces of the shell 2 are closed. The airflow box 4 is placed on the bottom surface inside the shell 2. The airflow box 4 is divided into a top cavity and a bottom cavity, and an isolation plate is arranged between the top cavity and the bottom cavity. The isolation plate is provided with uniformly arranged air jets that can connect the top cavity and the bottom cavity. The top surface of the top cavity is open, and a cover plate 3 with an air inlet groove covers the top surface of the airflow box 4, so that the top cavity is enclosed, and the right side and bottom surface of the bottom cavity of the radiator are formed by the inner surface of the bottom surface and the inner surface of the right side of the shell 2, and the left side of the bottom cavity of the radiator is open and communicates with the hot air outlet of the shell 2.

[0036] The flat box-like shell design can well cover the invention on the hot surface, and the airflow inflow direction is perpendicular to the outflow direction to avoid backflow affecting the heat dissipation effect. A large number of jets are arranged in an array on the airflow box isolation plate, parallel to the inner surface of the bottom surface of the shell, and the distance between the two is relatively close, which can enhance the heat dissipation effect brought by the vertical jet impact of the airflow.

[0037] like Figure 2 As shown, the electromagnetic vibration unit 5 is placed in the top cavity of the airflow box 4, and the two printed coils and two high magnetic elastic metal sheets in the electromagnetic vibration unit 5 are overlapped and placed horizontally on the base 505 from top to bottom. The electromagnetic vibration unit includes a first printed coil 501, a first high magnetic elastic metal sheet 502, a second printed coil 503 and a second high magnetic elastic metal sheet 504 arranged in sequence. The bases 505 of each electromagnetic vibration unit 5 are evenly arranged on the isolation plate of the airflow box 4, and the second high magnetic elastic metal sheet 504 of each electromagnetic vibration unit 5 blocks the air jet on the lower radiator isolation plate when the printed coil 501 is powered off.

[0038] The present invention adopts a method of generating an alternating magnetic field by energizing a printed coil to drive the high-magnetic elastic metal sheet to move, which can effectively separate the driving component from the moving component, thereby avoiding the risk of disintegration and failure of the two under high-frequency movement. The design of overlapping and horizontally placing two groups of printed coils and two groups of high-magnetic elastic metal sheets can enhance the suction and air ejection effects. When the first printed coil 501 is powered off, the second high-magnetic elastic metal sheet 504 blocks the air ejection port, which can prevent dust from entering the top cavity of the airflow box and affecting the working state of the electromagnetic vibration unit 5.

[0039] The working method of the above electromagnetic vibration radiator is:

[0040] The upper and lower printed coils of each electromagnetic vibration unit 5 are respectively supplied with a sinusoidal alternating voltage and a half-wave rectified voltage, and the two voltages are 180 degrees out of phase. The high magnetic elastic metal sheet 502 undergoes periodic deformation under the magnetic field created by the energized printed coil 501; when the first printed coil 501 is energized, the first high magnetic elastic metal sheet 502 bends downward, and low pressure appears above the first high magnetic elastic metal sheet 502. External air is attracted into the top cavity of the air flow box 4 through the air filter 1 and the air inlet groove on the cover plate 3 in turn, and high pressure appears below the first high magnetic elastic metal sheet 502; at the same time, the second printed coil 503 is supplied with a reverse voltage, and the second high magnetic elastic metal sheet 504 bends upward. At this time, the local high-pressure air above the second high magnetic elastic metal sheet 504 flows out through the air jet on the isolation plate and vertically shoots toward the inner surface of the bottom of the housing 2 with high thermal conductivity, and after absorbing the heat from the external heat source and transferring it to the bottom of the housing 2, it flows out from the hot air outlet of the housing 2 to the external environment. The first high magnetic elastic metal sheet and the second high magnetic elastic metal sheet are both made of springs.

[0041] The piezoelectric heat sink described in the present invention is substantially different from the piezoelectric heat sink in the prior art: first, the two have different methods of generating vibration. The piezoelectric heat sink uses the principle of the reverse piezoelectric effect, that is, when the piezoelectric ceramic is subjected to an alternating voltage, the deformation generated by the piezoelectric ceramic element realizes the up and down bending vibration of the high magnetic elastic metal sheet; while the electromagnetic vibration heat sink in the present invention uses the Lorentz force generated when the multi-turn printed coil is subjected to an alternating voltage to attract the high magnetic elastic metal sheet to generate up and down bending vibration, and there are no adhesive excitation elements and energized leads on the high magnetic elastic metal sheet; through such a design, the present invention avoids the problem of adhesive shedding and lead bending and disconnection caused by vibration from the source. Secondly, the printed coil in the present invention is fixed on the heat sink housing, and its surface is coated with three-proof paint; the surface of the high magnetic elastic metal sheet is nickel-plated for rust prevention, which effectively solves the problems caused by humidity, conductive dust contamination, etc.

[0042] In summary, different from the space occupation requirements of traditional blade fan heat sinks and the synchronous vibration characteristics of the vibrating plate and piezoelectric ceramics in piezoelectric fan heat sinks, the heat sink described in the present invention adopts electromagnetic vibration technology, and drives the high magnetic elastic metal sheet to move by inputting voltage to the printed coil, forcing the airflow to follow the movement to absorb and exhaust air, thereby reducing the temperature of the hot surface, forming a heat dissipation solution that spatially isolates the moving parts from the driving parts. The scheme of integrating the vibrating plate with the piezoelectric ceramics and their associated circuits in the prior art not only has the risk of operational failure during high-frequency operation, but also increases the difficulty of production and manufacturing. The present invention can flexibly adjust the vibration working conditions of the moving parts by separating the moving parts and the driving parts and changing the circuit parameters of the driving parts. At the same time, it also greatly eliminates the risk of operational failure of the heat dissipation unit, and separate manufacturing reduces the difficulty of production. With the characteristics of small size, high reliability, and easy production, the present invention can be widely used in various chips, electronic components and other heat source surfaces for heat dissipation, which is of great value in ensuring the safe and stable operation of heating devices.

[0043] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the scope of protection determined by the claims of the present invention.

Claims

1. An electromagnetic vibration radiator, characterized in that: The heat sink comprises a housing (2), an airflow box (4) installed in the housing (2), and an electromagnetic vibration unit (5) installed in the airflow box (4); An air filter membrane (1) is installed at the top opening of the housing (2); The airflow box (4) is mounted on the bottom surface of the housing (2); the airflow box (4) comprises a top cavity and a bottom cavity arranged in sequence from top to bottom; the top cavity and the bottom cavity are separated by an isolation plate; the isolation plate is provided with a plurality of evenly distributed air jets for connecting the top cavity and the bottom cavity; The electromagnetic vibration unit (5) is located in the top cavity; the electromagnetic vibration unit (5) comprises two spaced-apart bases (505) and an electromagnetic vibration body installed between the two bases (505); the electromagnetic vibration body comprises a first printed coil (501), a first high magnetic elastic metal sheet (502), a second printed coil (503) and a second high magnetic elastic metal sheet (504) which are overlapped and horizontally arranged between the two bases (505) in sequence from top to bottom; The number of the electromagnetic vibration units (5) is the same as the number of the air jets, and the two are arranged in a one-to-one correspondence; the base is mounted on the isolation plate; the electromagnetic vibration body is located above the air jets; A sinusoidal alternating voltage and a half-wave rectified voltage are applied to the first brush coil (501) and the second printed coil (503) respectively, and the voltage phase angles differ by 180°, so as to form a magnetic field around the first brush coil (501) and the second printed coil (503). Under the action of the magnetic field, the first high magnetic elastic metal sheet (502) and the second high magnetic elastic metal sheet (504) move to form an air suction and air ejection action to achieve heat dissipation.

2. The electromagnetic vibration radiator according to claim 1, characterized in that: One end of the housing (2) is provided with an inclined surface, and the end provided with the inclined surface has a hot air outlet.

3. The electromagnetic vibration radiator according to claim 1, characterized in that: An opening is arranged at the top of the top cavity, and a cover plate (3) is installed at the opening; the cover plate (3) is used to enclose the top cavity.

4. The electromagnetic vibration radiator according to claim 3, characterized in that: The cover plate (3) is provided with an air inlet groove.

5. The electromagnetic vibration radiator according to claim 1, characterized in that: The right side and the bottom side of the bottom cavity are respectively formed by the inner surface of the bottom surface and the inner surface of the right side of the shell (2), and a vent is provided on the left side of the bottom cavity.

6. The electromagnetic vibration radiator according to claim 1, characterized in that: The first high magnetic elastic metal sheet (502) and the second high magnetic elastic metal sheet (504) are both made of iron-cobalt-vanadium soft magnetic alloy; and the bottom surface of the shell is made of oxygen-free copper material.

7. The electromagnetic vibration radiator according to claim 1, characterized in that: The bases (505) of the various electromagnetic vibration units (5) are evenly arranged on the isolation plate.

8. The electromagnetic vibration radiator according to claim 1, characterized in that: The surfaces of the first printed coil (501) and the second printed coil (503) are coated with conformal coating.

9. The electromagnetic vibration radiator according to claim 1, characterized in that: The surfaces of the first high magnetic elastic metal sheet (502) and the second high magnetic elastic metal sheet (504) are plated with a nickel layer.

10. The working method of the electromagnetic vibration radiator according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1, applying a sinusoidal alternating voltage and a half-wave rectified voltage to the first printed coil (501) and the second printed coil (502) of each electromagnetic vibration unit (5), respectively, the voltage phases of the two printed coils differ by 180 degrees, and a magnetic field is formed between the two energized printed coils; S2, under the magnetic field created by the two energized printed coils, the first high magnetic elastic metal sheet (502) and the second high magnetic elastic metal sheet (504) undergo periodic deformation; In the first stage of each periodic deformation, when the first printed coil (501) is energized, the first high magnetic elastic metal sheet (502) bends downward, and as the voltage changes, the bending degree of the first high magnetic elastic metal sheet changes synchronously, and low air pressure appears above the first high magnetic elastic metal sheet (502). External air is attracted into the top cavity of the air flow box (4) through the air filter membrane (1) and the air inlet groove on the cover plate (3), and high air pressure appears below the first high magnetic elastic metal sheet (502); At the same time, a reverse voltage is applied to the second printed coil (503), and the second high magnetic elastic metal sheet (504) bends upward, so that the external air entering the top cavity forms high-pressure air above the second high magnetic elastic metal sheet (504). The high-pressure air first flows out to the bottom cavity through the air jet on the isolation plate, and then is ejected from the air vent on the bottom cavity to the inner surface of the bottom of the shell (2). The high-pressure air ejected to the inner surface of the bottom of the shell (2) absorbs the heat from the external heat source and transfers it to the bottom of the shell (2), and then flows out to the external environment from the hot air outlet of the shell (2); In the second stage of each periodic deformation, the first printed coil (501) remains energized, the voltage is opposite to the voltage applied in the first stage, the first high magnetic permeability elastic metal sheet (502) bends upward, and the degree of bending of the first high magnetic permeability elastic metal sheet (502) changes synchronously with the voltage. The external air introduced in the first stage fills the area below the first high magnetic permeability metal sheet. When the second printed coil (502) is powered off, the second high magnetic permeability elastic metal sheet (504) of each electromagnetic vibration unit (5) blocks the air jet on the isolation plate.

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