CN106247293B - Heat dissipation structure of LED navigation aid lamp - Google Patents
Heat dissipation structure of LED navigation aid lamp Download PDFInfo
- Publication number
- CN106247293B CN106247293B CN201610892764.5A CN201610892764A CN106247293B CN 106247293 B CN106247293 B CN 106247293B CN 201610892764 A CN201610892764 A CN 201610892764A CN 106247293 B CN106247293 B CN 106247293B
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- lamp
- heat
- radiator
- cover
- upper cover
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
- F21W2111/06—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00 for aircraft runways or the like
Abstract
The invention discloses a heat dissipation structure of an LED navigation aid lamp, which comprises a lamp shell and a radiator, wherein the lamp shell comprises a lamp upper cover and a lamp lower cover; the lamp upper cover is provided with a mounting groove, a plurality of auxiliary mounting blocks are arranged in the mounting groove, a fixing groove for fixing the radiator is arranged between the auxiliary mounting blocks, the lamp upper cover is also provided with a light hole, and one end of the light hole is communicated with the mounting groove; the radiator comprises a radiating main body and a fixed column matched with a fixed groove arranged in the upper cover of the lamp for use, the radiating main body is connected with the fixed column, an accommodating cavity is arranged in the radiating main body, and radiating fins are arranged on the radiating main body; the lamp lower cover is fixedly connected with the lamp upper cover; the radiator is tightly attached to the bottom of the mounting groove of the upper cover of the lamp and the inner surface of the lower cover. The LED lamp is more convenient to install, the improved structure changes the main heat dissipation path, the heat conduction resistance is reduced, the heat dissipated by the LED can be more quickly LED out of the lamp, and the heat dissipation effect of the lamp is enhanced.
Description
Technical Field
The invention relates to a heat dissipation structure of an LED navigation aid lamp.
Background
The navigation aid lamp is arranged on the positions of an airport runway, a taxiway, a airport apron and the like, is divided into a vertical type and an embedded type, and provides necessary visual navigation aid guidance for the sliding and the taking off and landing of the airplane. The LED navigation aid lamp adopts an LED light source, and the service life and the lighting effect of the lamp are directly influenced by the heat dissipation effect of the lamp.
The LED navigation aid lamp used in the airport has a great heat dissipation problem in the actual use process. The LED lamp used at present adopts a heat dissipation mode that an LED is welded on an aluminum substrate, the aluminum substrate is fixed on an aluminum alloy or copper radiator according to a light path design scheme, and the radiator is fixed on a lamp shell. The heat dissipation path of the radiator has two ways: 1. the outer surface of the radiator is provided with a plurality of fins for radiating heat into the air in the lamp and then conducting the heat to the lamp shell through the air; 2. the partial area of the upper surface of the heat sink is in contact with the housing to directly conduct heat to the housing. The heat dissipated to the lamp housing is dissipated to the air or conducted to the soil by external air convection.
In the first approach, because the inside of the lamp is a closed space and there is no air convection, heat can be transferred from the radiator to the air and then to the housing only through a heat conduction mode, and the heat conductivity of the air is extremely low, so that the heat conduction resistance is large, and compared with the second approach, a heat conduction link of heat conduction in the air is added, and the heat dissipation capability is reduced. In the second approach, the contact area between the radiator and the shell is small, the heat conduction area is small, and the heat dissipation capability is limited.
In order to meet the navigation aid requirement, the power of the LED navigation aid lamp is generally higher, so that the heat dissipation requirement is higher, and therefore, the structure of the radiator is improved, the heat dissipation capability of the radiator is improved, and the heat dissipation effect of the LED navigation aid lamp is enhanced, so that the LED navigation aid lamp has important practical significance for long-term use of the navigation aid lamp.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the LED navigation aid lamp heat dissipation structure with super-strong heat dissipation capacity.
The purpose of the invention is realized by the following technical scheme: a heat dissipation structure of an LED navigation aid lamp comprises a lamp shell and a heat radiator, wherein the lamp shell comprises a lamp upper cover and a lamp lower cover; the lamp upper cover is provided with a mounting groove, a plurality of auxiliary mounting blocks are arranged in the mounting groove, a fixing groove for fixing the radiator is arranged between the auxiliary mounting blocks, the lamp upper cover is also provided with a light hole, and one end of the light hole is communicated with the mounting groove; the heat radiator comprises a heat radiation main body and a fixed column matched with a fixed groove arranged in the upper cover of the lamp for use, the heat radiation main body is connected with the fixed column, an accommodating cavity is arranged in the heat radiation main body, the accommodating cavity is used for mounting the LED and the circuit substrate, and heat radiation fins are arranged on the heat radiation main body; the lamp lower cover is fixedly connected with the lamp upper cover; the upper surface of the radiator is tightly attached to the bottom of the mounting groove of the upper cover of the lamp, and the part of the side surface from the radiator fixing column to the bottom surface of the radiator is tightly attached to the inner surface of the lower cover.
Preferably, the auxiliary mounting block and the lamp upper cover are integrally formed, and the fixing column is tightly attached to the bottom surface of the mounting groove and/or the auxiliary mounting block.
As a preferred mode, the heat dissipation main body is a cylinder, the number of the fixing columns is four, and the four fixing columns are uniformly distributed on the side face of the heat dissipation main body; the auxiliary mounting blocks are four, and a fixing groove is formed between two adjacent auxiliary mounting blocks in the four auxiliary mounting blocks and used for mounting a fixing column.
Preferably, the mounting groove is a cylindrical groove, the auxiliary mounting block is 4 parts formed by uniformly dividing a maximum circular ring arranged in the mounting groove by the fixing groove, and the height of the auxiliary mounting block is equal to or less than that of the mounting groove.
Preferably, the height of the fixing column and the height of the auxiliary mounting block are consistent, the height of the auxiliary mounting block is smaller than that of the mounting groove, a part of the lower lamp cover is arranged in the mounting groove, the upper surface of the lower lamp cover is tightly attached to the auxiliary mounting block, and the outer surface of the lower lamp cover is tightly attached to the inner surface of the mounting groove.
Preferably, a heat conducting material layer is arranged on the surface of the heat radiator, which is in contact with the lamp upper cover and/or the lamp lower cover, so that heat on the heat radiator is transferred to the lamp upper cover and/or the lamp lower cover more quickly.
Preferably, the surface of the radiator, which is in contact with the lamp upper cover and/or the lamp lower cover, is coated with heat-conducting silicone grease or heat-conducting grease or heat-radiating oil so as to transfer the heat on the radiator to the lamp upper cover and/or the lamp lower cover more quickly.
Preferably, the bottom of the heat sink accommodating cavity is provided with a through hole for facilitating the penetration of an electric wire, a mounting hole for fixing the circuit substrate and a positioning hole for positioning the circuit substrate.
Preferably, the heat sink accommodating cavity is of a cylindrical structure, and the middle part of the accommodating cavity is provided with a partition board to partition the accommodating cavity into two parts which are respectively used for fixing one circuit substrate.
As a preferable mode, the lamp upper cover is provided with a lamp upper cover connecting hole, the lamp lower cover is provided with a lamp lower cover connecting hole matched with the lamp upper cover connecting hole for use, and the lamp upper cover is connected with the lamp lower cover through a bolt or a screw.
The invention has the beneficial effects that: the invention changes the traditional radiator structure and the fixing mode of the radiator on the lamp shell, so that the radiator is more convenient to mount and is more closely attached to the lamp shell; the contact area between the outer surface and the lamp shell is increased, the heat conduction area is increased, more heat is transferred to the lamp shell through a faster way, and therefore the heat dissipation effect is enhanced. The invention makes the radiator structure more reasonable and heat conduction more uniform; the fixing mode of the lamp on the outer cover of the lamp is simplified; the area of the upper surface and the side surface of the radiator is increased, the radiator is tightly attached to the lamp upper cover and the lamp lower cover, and the heat conduction area is increased. The improved structure changes the main heat dissipation way, reduces the heat conduction resistance, enables the heat emitted by the LED to be LED out of the lamp more quickly, and enhances the heat dissipation effect of the lamp.
Drawings
FIG. 1 is a schematic structural view of a lamp upper cover according to the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic structural view of a lower cover of a lamp according to the present invention;
FIG. 4 is a schematic view of an overall split structure of the LED navigation aid lamp;
FIG. 5 is a schematic view of a disassembled structure of the heat sink and the upper cover of the present invention;
FIG. 6 is a schematic view of an assembly structure of the heat sink and the top cover according to the present invention;
FIG. 7 is a schematic view of a disassembled structure of the heat sink and the lower cover of the present invention;
FIG. 8 is a schematic view of an assembly structure of the heat sink and the lower cover according to the present invention;
FIG. 9 is a schematic view of the overall assembly structure of the present invention;
in the figure, 1-fixed column, 2-upper surface of radiator, 3-through hole, 4-mounting hole, 5-positioning hole, 6-side surface of radiator, 7-radiating fin, 8-fixing groove, 9-mounting groove, 10-connecting hole of upper cover of lamp, 11-connecting hole of lower cover of lamp, 12-inner surface of lower cover of lamp, 13-upper surface of lower cover of lamp.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1 to 9, an LED navigation aid lamp heat dissipation structure includes a lamp housing and a heat sink, where the lamp housing includes a lamp upper cover and a lamp lower cover; the lamp upper cover is provided with a mounting groove 9, a plurality of auxiliary mounting blocks are arranged in the mounting groove 9, a fixing groove 8 for fixing the radiator is arranged between the auxiliary mounting blocks, the lamp upper cover is also provided with a light hole, and one end of the light hole is communicated with the mounting groove 9; the radiator comprises a radiating main body and a fixed column 1 matched with a fixed groove 8 arranged in an upper cover of the lamp for use, the radiating main body is connected with the fixed column 1, an accommodating cavity is arranged in the radiating main body, the accommodating cavity is used for mounting the LED and the circuit substrate, and radiating fins 7 are arranged on the radiating main body; the lamp lower cover is fixedly connected with the lamp upper cover; the upper surface of the radiator is tightly attached to the bottom of the mounting groove 9 of the upper cover of the lamp, and the part of the side surface from the radiator fixing column 1 to the bottom surface of the radiator is tightly attached to the inner surface of the lower cover.
Preferably, the auxiliary mounting block and the lamp upper cover are integrally formed, and the fixing column 1 is tightly attached to the bottom surface of the mounting groove 9 and/or the auxiliary mounting block.
Preferably, the heat dissipation main body is a cylinder, the number of the fixing columns 1 is four, and the four fixing columns 1 are uniformly distributed on the side face of the heat dissipation main body; the number of the auxiliary mounting blocks is four, and a fixing groove 8 is formed between two adjacent auxiliary mounting blocks in the four auxiliary mounting blocks and used for mounting the fixing column 1.
Preferably, the mounting groove 9 is a cylindrical groove, the auxiliary mounting block is 4 parts formed by uniformly dividing the maximum circular ring arranged in the mounting groove 9 by the fixing groove 8, and the height of the auxiliary mounting block is equal to or less than that of the mounting groove 9.
Preferably, the height of the fixing column 1 and the height of the auxiliary mounting block are consistent, the height of the auxiliary mounting block is smaller than the height of the mounting groove 9, a part of the lower cover of the lamp is arranged in the mounting groove 9, the upper surface 13 of the lower cover of the lamp is tightly attached to the auxiliary mounting block, and the outer surface of the lower cover of the lamp is tightly attached to the inner surface of the mounting groove 9.
Preferably, a heat conducting material layer is arranged on the surface of the heat radiator, which is in contact with the upper lamp cover and/or the lower lamp cover, so that heat on the heat radiator is more quickly transferred to the upper lamp cover and/or the lower lamp cover.
Preferably, the surface of the radiator contacting with the lamp upper cover and/or the lamp lower cover is coated with heat-conducting silicone grease or heat-conducting grease or heat-radiating oil so as to transfer the heat on the radiator to the lamp upper cover and/or the lamp lower cover more quickly.
Preferably, the bottom of the heat sink accommodating cavity is provided with a through hole 3 for facilitating the penetration of an electric wire, a mounting hole 4 for fixing a circuit substrate and a positioning hole 5 for positioning the circuit substrate.
Preferably, the radiator accommodating cavity is of a cylindrical structure, and the middle part of the accommodating cavity is provided with a separation plate to separate the accommodating cavity into two parts which are respectively used for fixing one circuit substrate.
Preferably, the lamp upper cover is provided with a lamp upper cover connecting hole 10 (which may be a threaded hole), the lamp lower cover is provided with a lamp lower cover connecting hole 11 (which may be a threaded hole) used in cooperation with the lamp upper cover connecting hole 10, and the lamp upper cover and the lamp lower cover are connected through a bolt or a screw.
Preferably, the circuit of the invention is made of aluminum material basically, and the lamp upper cover, the lamp lower cover and the radiator are made of copper material.
Preferably, the radius of circle a +0.5mm to 2mm = the radius of circle b = the radius of circle c; the radius of a circle d = the radius of a circle e +0.5 mm-2 mm, wherein the circle a is a section circle of the side surface 6 of the radiator, the circle b is a section circle of the inner wall of the largest circular ring formed by the auxiliary mounting block, the circle c is a section circle of the inner surface 12 of the lower cover of the lamp, the circle d is a section circle of the side wall of the mounting groove 9, and the circle e is a section circle of the largest outer surface of the lower cover of the lamp.
The invention relates to a heat dissipation structure of an LED navigation aid lamp with super-strong heat dissipation capability. The inner concave surface (mounting groove 9) of the radiator adopts a round surface, so that the area of the upper surface is increased; the side surface of the radiator is a cylindrical surface, so that the area of the side surface is increased; the periphery of the top of the radiator is provided with fixing columns 1 which are completely meshed with a fixing groove 8 of an upper cover, as shown in the attached drawing 5, the lower cover is covered, the upper surface of a ring of the lower cover is used for propping against the fixing columns 1 to fix the fixing columns in the fixing groove 8, the lower cover and the upper cover are connected and fixed through threaded holes and bolts, and the radiator is not required to be fixed with the upper cover through screws; the upper surface of the radiator is tightly attached to the concave surface of the upper cover, the side surface of the radiator is tightly attached to the inner surface of the lower cover, and heat-conducting silica gel is smeared on the surface of the radiator during installation.
Calculating and analyzing:
the heat transfer process from the lower surface of the radiator to the air in the lamp and then to the lower cover of the lamp can be simplified into natural convection heat transfer in a limited space. This is a type of situation where both flow and heat transfer modalities are quite complex, engineering simplifies to deal with in the form of "heat transfer" and thus introduces the concept of equivalent thermal conductivity. The flow of fluid in the interlayer is mainly determined by the Gr number with the characteristic length of the interlayer thickness delta
Wherein α =1/Tm (K-1) is a volume expansion coefficient; where the temperature is in K.
The temperature of the lower part of the radiator is assumed to be 100 ℃, the temperature of the outer cover of the cast iron lamp is assumed to be 50 ℃, and the distance between the lower surface of the radiator and the lower cover of the cast iron lamp is assumed to be 3cm. The characteristic temperature tm =75 ℃, at which the kinematic viscosity v of the air =20.5 × 10-6m2/s, λ =3.005 × 10-2W/(m · K), pr =0.693. Gr from formula (1) δ =90463. When Gr is δ Nu number of Nu < 7X 103 > -3.2X 105 = δ ＝0.212(Gr δ Pr) 1/4 =3.35, equivalent thermal conductivity λ e ＝Nu δ λ＝0.1W/(m·K)。
The heat conductivity of the heat radiator material brass is 131W/(m.K) at 100 ℃, the heat conductivity is 143W/(m.K) at 50 ℃, and the average heat conductivity in the heat radiator is lambda Cu = 137W/(m · K). Silver silicone grease for heat-conducting silica gel smeared on upper surface 2 and side surface of radiatorThermal conductivity of λ thereof Si ＝9W/(m·K)。
The radius of the outer circle of the upper surface 2 of the radiator is 5cm, the radius of the inner circle is 3cm, the height of the side surface is 3cm, and the thickness of the radiating fin 7 is 5mm. When heat is transferred to air in the lamp through the lower surface of the radiator and then transferred to the lamp shell, the heat conduction thermal resistance
Heat transfer capacity
When heat is transferred to the lamp shell through the side surface 6 of the radiator, the heat is conducted by the cylindrical wall inside the radiator, and the heat conduction resistance
The temperature of the inner wall is lower than that of the bottom of the radiator, the average temperature is 70 ℃, and the heat conduction quantity is
Thermal resistance when heat is transferred to the lamp housing through the upper surface 2 of the heat sink
Average temperature of lower surface is 75 deg.C, heat conductivity
The heat transfer is only 1.31W when heat is transferred to the air in the lamp through the lower surface of the heat sink and then to the lamp envelope, whereas the heat transfer can reach 284W and 833W when heat is transferred to the lamp envelope through the side surface 6 and the upper surface of the heat sink. The heat radiator mainly radiates heat through the upper surface and the side surface, and the purpose of changing the main radiating way is achieved. The heat conduction quantity of the side surface is 3 times of that of the upper surface, so that the purpose of enhancing heat conduction by changing the structure to increase the heat conduction area of the side surface is achieved. The radiator can lead the heat emitted by the LED out of the lamp more quickly and enhance the heat dissipation effect of the lamp.
The present invention should be considered as limited only by the preferred embodiments and not by the specific details, but rather as limited only by the accompanying drawings, and as used herein, is intended to cover all modifications, equivalents and improvements falling within the spirit and scope of the invention.
Claims (10)
1. A heat dissipation structure of an LED navigation aid lamp comprises a lamp shell and a heat radiator, wherein the lamp shell comprises a lamp upper cover and a lamp lower cover; the method is characterized in that: the lamp upper cover is provided with a mounting groove, a plurality of auxiliary mounting blocks are arranged in the mounting groove, a fixing groove for fixing the radiator is arranged between the auxiliary mounting blocks, the lamp upper cover is also provided with a light hole, and one end of the light hole is communicated with the mounting groove; the heat radiator comprises a heat radiation main body and a fixed column matched with a fixed groove arranged in the upper cover of the lamp for use, the heat radiation main body is connected with the fixed column, an accommodating cavity is arranged in the heat radiation main body, the accommodating cavity is used for mounting the LED and the circuit substrate, and heat radiation fins are arranged on the heat radiation main body; the lamp lower cover is fixedly connected with the lamp upper cover; the upper surface of the radiator is tightly attached to the bottom of the mounting groove of the upper cover of the lamp, and the part of the side surface from the radiator fixing column to the bottom surface of the radiator is tightly attached to the inner surface of the lower cover.
2. The heat dissipation structure of the LED navigation aid lamp according to claim 1, wherein: the auxiliary mounting block and the lamp upper cover are integrally formed, and the fixing column is tightly attached to the bottom surface of the mounting groove and/or the auxiliary mounting block.
3. The heat dissipation structure of an LED navigation aid lamp according to claim 1 or 2, wherein: the heat dissipation main body is a cylinder body,
the number of the fixed columns is four, and the four fixed columns are uniformly distributed on the side face of the heat dissipation main body; the auxiliary mounting blocks are four, and a fixing groove is formed between two adjacent auxiliary mounting blocks in the four auxiliary mounting blocks and used for mounting a fixing column.
4. The heat dissipation structure of the LED navigation aid lamp according to claim 3, wherein: the mounting groove be cylindrical recess, supplementary installation piece be 4 parts that the biggest ring that sets up in the mounting groove formed after evenly being partd by the fixed slot, the height that supplementary installation piece highly equals or is less than the mounting groove.
5. The heat dissipation structure of the LED navigation aid lamp according to claim 4, wherein: the height of the fixing column and the height of the auxiliary mounting block are consistent, the height of the auxiliary mounting block is smaller than that of the mounting groove, one part of the lower lamp cover is arranged in the mounting groove, the upper surface of the lower lamp cover is tightly attached to the auxiliary mounting block, and the outer surface of the lower lamp cover is tightly attached to the inner surface of the mounting groove.
6. The heat dissipation structure of an LED navigation aid lamp according to claim 1 or 2, wherein: the surface of the radiator, which is in contact with the lamp upper cover and/or the lamp lower cover, is provided with a heat conducting material layer so as to enable heat on the radiator to be transferred to the lamp upper cover and/or the lamp lower cover more quickly.
7. The heat dissipation structure of the LED navigation aid lamp according to claim 6, wherein: the surface of the radiator contacted with the upper lamp cover and/or the lower lamp cover is coated with heat-conducting silicone grease or heat-radiating oil so as to enable the heat on the radiator to be transferred to the upper lamp cover and/or the lower lamp cover more quickly.
8. The heat dissipation structure of the LED navigation aid lamp according to claim 1, wherein: the bottom of the heat radiator accommodating cavity is provided with a through hole for facilitating the penetration of an electric wire, a mounting hole for fixing a circuit substrate and a positioning hole for positioning the circuit substrate.
9. The heat dissipation structure of an LED navigation aid lamp according to claim 1 or 8, wherein: the radiator accommodating cavity is of a cylindrical structure, and the middle part of the accommodating cavity is provided with a separation plate to separate the accommodating cavity into two parts which are respectively used for fixing one circuit substrate.
10. The heat dissipating structure of an LED navigation light as claimed in claim 1, 2, 4, 5, 7 or 8, wherein: the lamp upper cover is provided with a lamp upper cover connecting hole, the lamp lower cover is provided with a lamp lower cover connecting hole matched with the lamp upper cover connecting hole, and the lamp upper cover is connected with the lamp lower cover through a bolt or a screw.
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| CN106247293A (en) | 2016-12-21 |
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