CN111812926A

CN111812926A - Radiator, laser fluorescent light source and radiator design method

Info

Publication number: CN111812926A
Application number: CN202010834594.1A
Authority: CN
Inventors: 刘金根; 陈龙; 刘飞
Original assignee: Wuxi Seemile Laser Display Technology Co Ltd
Current assignee: Wuxi Seemile Laser Display Technology Co Ltd
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2020-10-23
Anticipated expiration: 2040-08-18
Also published as: CN111812926B

Abstract

The invention provides a radiator, a laser fluorescent light source and a radiator design method, and relates to the technical field of laser fluorescent light sources. The laser fluorescence light source includes: the wavelength conversion module comprises a wavelength conversion component and a heat radiator, wherein the heat radiator surrounds a motor of the wavelength conversion component. The radiator, the laser fluorescent light source and the design method of the radiator can improve the noise absorption performance and improve the heat dissipation efficiency of the laser fluorescent light source.

Description

Radiator, laser fluorescent light source and radiator design method

Technical Field

The invention relates to the technical field of laser fluorescent light sources, in particular to a radiator, a laser fluorescent light source and a radiator design method.

Background

With the increasing power of the laser fluorescent projector, the requirements for the brightness and color of the projector are higher and higher, and in order to ensure the conversion efficiency of the wavelength conversion material, it is necessary to ensure the smooth heat dissipation of the wavelength conversion device. In order to improve the heat dissipation performance of the wavelength conversion device, the substrate size of the wavelength conversion device is large, and in the case of a constant motor load, the problem of noise of the wavelength conversion device is particularly prominent as the substrate size (load) increases. Although the sound insulation material with a large thickness can insulate noise, the heat dissipation performance of the light source is reduced.

Disclosure of Invention

The invention aims to provide a radiator, a laser fluorescent light source and a radiator design method, which can improve both heat dissipation and sound absorption performance.

In a first aspect, the heat sink provided by the present invention includes a heat sink, where the heat sink is provided with a plurality of through holes, and the through holes are arranged at intervals.

With reference to the first aspect, the present disclosure provides a first possible implementation manner of the first aspect, wherein the perforation rate of the heat dissipation fins is less than 10%.

With reference to the first aspect, the present disclosure provides a second possible implementation manner of the first aspect, wherein the diameter of the through hole is smaller than 5 mm.

With reference to the first aspect, the present invention provides a third possible implementation manner of the first aspect, wherein a plurality of the heat sinks are provided, the plurality of the heat sinks are arranged in parallel, and an air layer is provided between any two adjacent heat sinks;

any adjacent two of the air layers are in fluid communication through the through-hole.

With reference to the third possible implementation manner of the first aspect, the present invention provides a fourth possible implementation manner of the first aspect, wherein the heat sink further includes a heat pipe, and the heat pipe passes through the plurality of fins.

In a second aspect, the present invention provides a laser fluorescence light source, comprising: a wavelength conversion assembly and the heat sink of the first aspect, the heat sink enclosing the electric motor of the wavelength conversion assembly.

In combination with the second aspect, the present disclosure provides a first possible implementation manner of the second aspect, wherein the laser fluorescence light source further includes a sound absorbing device, the sound absorbing device includes a base body, and the base body is provided with a plurality of concave-convex portions;

the plurality of concave-convex portions are arranged at intervals and face the wavelength conversion member.

In combination with the first possible implementation manner of the second aspect, the present disclosure provides a second possible implementation manner of the second aspect, wherein the concavo-convex portion includes a projection having a tip portion.

In combination with the second possible implementation manner of the second aspect, the invention provides a third possible implementation manner of the second aspect, wherein the protrusions are hollowed out.

In combination with the first possible implementation manner of the second aspect, the present invention provides a fourth possible implementation manner of the second aspect, wherein the concave-convex portion includes a cone, a boss or a wedge structure.

With reference to the first possible implementation manner of the second aspect, the present invention provides a fifth possible implementation manner of the second aspect, wherein the base body includes a light source housing, and the concave-convex portion is provided on an inner side wall of the light source housing.

In combination with the fifth possible implementation manner of the second aspect, the present invention provides a sixth possible implementation manner of the second aspect, wherein the side wall of the light source casing is hollowed out.

In a third aspect, the present invention provides a method for designing a heat sink, including: noise with the vibration frequency of 360 Hz-720 Hz is taken as a silencing target, or noise with the frequency of 2-6 times of the rotation frequency of the motor is taken as the silencing target;

the perforation rate of the heat sink and the hole diameter of the through-hole were obtained by calculation using the following formulas.

The embodiment of the invention has the following beneficial effects: adopt the fin to be equipped with a plurality of through-holes, and a plurality of through-holes interval sets up, not only increased the heat radiating area of fin through the through-hole, the sound wave can be in the through-hole by multiple reflection moreover, can compromise and possess the heat dissipation and inhale the sound performance.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a first schematic diagram of a sound-absorbing device of a laser fluorescence light source according to an embodiment of the present invention;

FIG. 2 is a second schematic view of a sound-absorbing device of a laser fluorescence light source according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a laser fluorescence light source according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a sound-absorbing device of a laser fluorescent light source according to an embodiment of the present invention;

fig. 5 is a schematic view of a heat sink according to an embodiment of the invention.

Icon: 100-a substrate; 110-a relief portion; 200-a heat sink; 210-a heat sink; 211-air layer; 212-a via; 220-a heat pipe; 300-a wavelength conversion component; 310-electric motor.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "physical quantity" in the formula, unless otherwise noted, is understood to mean a basic quantity of a basic unit of international system of units, or a derived quantity derived from a basic quantity by a mathematical operation such as multiplication, division, differentiation, or integration.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

As shown in fig. 5, the heat sink includes a heat sink 210, the heat sink 210 is provided with a plurality of through holes 212, and the plurality of through holes 212 are spaced apart. The heat dissipation area of the heat dissipation plate 210 can be increased by the through holes 212, and the sound waves can be reflected in the through holes 212, so that the heat sink has both heat dissipation and sound absorption performances.

Further, the perforation rate of the fin 210 is less than 10%.

The perforation rate of the heat dissipation plate 210 may be configured to be 1%, 3%, or 5%, where the perforation rate is a ratio of an area of the plurality of through holes to an area of the heat dissipation plate 210. The plurality of through holes 212 may be arranged in a forward direction, arranged in a triangular shape, or arranged along parallel slits, and the calculation method of the perforation rate may be designed according to the arrangement form of the plurality of through holes 212, which is not described herein.

Further, the diameter of the through hole 212 is less than 5 mm.

The diameter of the through hole 212 is preferably smaller than 1mm, the diameter of the through hole 212 can be configured to be 0.5 mm-1 mm, and a fan can be added to guide airflow to rapidly flow through the heat sink 210 through the plurality of through holes 212, so that the heat dissipation efficiency is improved, and the heat dissipation capability of the laser fluorescent light source is enhanced.

As shown in fig. 3 and 4, the noise vibration frequency of the wavelength conversion module 300 is mainly represented by an approximate value of 360Hz, 480Hz, or 600Hz, and in order to eliminate the noise emitted from the wavelength conversion device, the noise vibration frequency of the wavelength conversion module 300 may be set to 480Hz, and the thickness and the perforation rate of the heat sink 210 and the aperture diameter of the through hole 212 may be determined according to the noise vibration frequency.

Further, a plurality of cooling fins 210 are provided, the plurality of cooling fins 210 are arranged in parallel, and an air layer 211 is arranged between any two adjacent cooling fins 210; any adjacent two air layers 211 are in fluid communication through the through holes 212.

Specifically, air is filled in the air layer 211, and the plurality of heat dissipation fins 210 may absorb heat of the wavelength conversion assembly 300 and contact the air through the plurality of heat dissipation fins 210, so as to increase a heat dissipation area and further increase heat dissipation efficiency.

Further, the heat sink 200 further includes a heat conductive pipe 220, and the heat conductive pipe 220 passes through the plurality of fins 210.

Specifically, the heat sink 210 is provided with mounting holes for mounting the heat conductive pipes 220, the diameter of the mounting holes being larger than that of the through holes 212, so as to mount the heat conductive pipes 220 having a large radial dimension. The heat pipe 220 is inserted into the plurality of fins 210, and the plurality of fins 210 are connected in series by the heat pipe 220, and the air layer 211 between two adjacent fins 210 is beneficial to improving the sound absorption efficiency, especially absorbing low-frequency noise, and can play a role in enabling the plurality of fins 210 to resonate.

Example two

As shown in fig. 1, fig. 2, fig. 3 and fig. 5, the laser fluorescence light source provided by the embodiment of the present invention includes: the wavelength conversion assembly 300 and the heat sink provided in the first embodiment, the heat sink 200 encloses the motor 310 of the wavelength conversion assembly 300.

Specifically, the heat sink 200 is installed in the light source housing, and the heat sink 200 is disposed at one side of the wavelength conversion assembly 300 in the axial direction of the wavelength conversion assembly 300, or two heat sinks 200 are located at both ends of the wavelength conversion assembly 300 in one-to-one correspondence. The heat of the wavelength conversion assembly 300 may be dissipated to the outside through the heat sink 200.

Further, the laser fluorescence light source further comprises a sound absorption device, wherein the sound absorption device comprises a base body 100, and the base body 100 is provided with a plurality of concave-convex parts 110; the plurality of concave and convex portions 110 are disposed at intervals and face the wavelength conversion member 300.

Specifically, the concave-convex portion 110 may increase the surface area of the base 100, and may increase the sound absorption average coefficient, thereby being capable of absorbing more noise.

In some embodiments, the concave-convex portion 110 includes a concave pit or a small hole formed in the substrate 100, and the substrate 100 may form a concave-convex surface through a plurality of concave pits or small holes, so as to increase the area of the reflection surface, thereby improving the sound absorption effect.

As shown in fig. 3 and 4, in the embodiment of the present invention, the base 100 includes a light source housing, and the concave-convex portion 110 is disposed on an inner sidewall of the light source housing.

Specifically, the concave-convex part 110 is arranged on the inner side wall of the light source casing facing the sound source, so that the area of the inner side wall of the light source casing is increased, the sound absorption average coefficient of the space in the light source casing is improved, and the sound absorption effect is further improved.

In order to improve the sound insulation performance, the side wall of the light source casing is hollowed out, so that the sound transmitted outwards through the light source casing can be reduced.

In one embodiment, the concave-convex portion 110 includes a protrusion having a tip portion. The cross section formed by a plurality of protrusions with tip parts is in a sawtooth shape, the protruded tip parts face the inner cavity of the light source casing, and the tip parts face the sound source in the light source casing, so that sound waves can be reflected and transmitted along the direction which is approximately parallel to the inner side wall of the light source casing, and the outward transmission through the base body 100 is avoided.

Furthermore, the bulges are hollowed out, so that the sound transmitted outwards through the bulges can be reduced, and the sound absorption effect is improved.

In another embodiment, the asperities 110 comprise a cone, a boss, or a wedge structure. The cone, the boss or the wedge structure is provided with a plurality of cones, the boss or the wedge structure, and any two adjacent cones, bosses or the wedge structures are arranged at intervals, and the sound wave transmitted to the concave-convex part 110 can be reflected, thereby isolating the noise from being transmitted to the outside of the base body 100.

EXAMPLE III

As shown in fig. 3 and 4, a method for designing a heat sink according to an embodiment of the present invention includes: the perforation rate of the heat sink 210 and the aperture of the through hole 212 are calculated by the following formula with the noise of the vibration frequency of 360 Hz-720 Hz as the noise reduction target, or with the noise of 2-6 times of the rotation frequency of the motor 310 as the noise reduction target.

Specifically, the design method of the heat sink can be based on the formula:

wherein f is₀Is the sound frequency in Hz; c is the sound velocity in m/s; p is the perforation rate, i.e. the ratio of the area of the through holes 212 on the heat sink 210 to the total area of the heat sink 210; d is the thickness of the air film between the heat sink 210 and the rigid wall, i.e. the thickness of the air layer 211, in m; t is the thickness of the heat sink 210 in m; d is the aperture of the via 212 in m. For the wavelength conversion assembly 300, the noise frequency of the noise reduction target approaches 480Hz, the thickness of the heat dissipation sheet 210 is 1mm, the aperture of the through hole 212 is 0.5mm to 1mm, and the perforation rate of the heat dissipation sheet 210 is preferably 1% to 3%, so that the heat sink 200 has both heat dissipation and sound absorption functions, and is particularly suitable for absorbing low-frequency noise.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat sink is characterized by comprising a heat radiating fin (210), wherein the heat radiating fin (210) is provided with a plurality of through holes (212), and the plurality of through holes (212) are arranged at intervals.

2. The heat sink according to claim 1, wherein the perforation rate of the fins (210) is less than 10%.

3. A heat sink according to claim 1, wherein the diameter of the through hole (212) is less than 5 mm.

4. The heat sink according to claim 1, wherein the heat dissipation fins (210) are provided in plurality, the plurality of heat dissipation fins (210) are arranged in parallel, and an air layer (211) is provided between any two adjacent heat dissipation fins (210);

any adjacent two of the air layers (211) are in fluid communication through the through-holes (212).

5. The heat sink according to claim 4, wherein the heat sink (200) further comprises a heat pipe (220), the heat pipe (220) passing through the plurality of fins (210).

6. A laser fluorescence light source, comprising: a wavelength converting assembly (300) and a heat sink according to any of claims 1-5, the heat sink (200) enclosing an electric motor (310) of the wavelength converting assembly (300).

7. The laser fluorescence light source according to claim 6, further comprising a sound absorbing device including a base body (100), and the base body (100) is provided with a plurality of concave-convex portions (110);

the plurality of concave-convex portions (110) are arranged at intervals and face the wavelength conversion member (300).

8. The laser fluorescence light source according to claim 7, wherein the concavo-convex portion (110) includes a protrusion having a tip portion.

9. The laser fluorescent light source of claim 8, wherein the protrusions are hollowed out.

10. The laser fluorescence light source of claim 7, wherein the concavo-convex portion (110) comprises a cone, a boss, or a wedge structure.

11. The laser fluorescence light source of claim 7, wherein the base body (100) comprises a light source housing, and the concave-convex portion (110) is provided on an inner side wall of the light source housing.

12. The laser fluorescence light source of claim 11, wherein the side wall of the light source housing is hollowed out.

13. A heat sink design method, comprising:

noise with the vibration frequency of 360 Hz-720 Hz is taken as a silencing target, or noise with the frequency of 2-6 times of the rotation frequency of the motor (310) is taken as the silencing target;

the perforation rate of the heat sink (210) and the aperture diameter of the through-hole (212) are calculated using the following formulas.