WO2018225606A1

WO2018225606A1 - Led lamp

Info

Publication number: WO2018225606A1
Application number: PCT/JP2018/020761
Authority: WO
Inventors: 弘久林
Original assignee: 株式会社エイコー; 株式会社Ｐｏｌａｒｉｓ
Priority date: 2017-06-06
Filing date: 2018-05-30
Publication date: 2018-12-13
Also published as: KR20200015491A; JP6581148B2; JP2018206629A; CN110998172A

Abstract

Provided is a LED lamp that suppresses temperature increase in a cover. An LED lamp (1) is provided with: an LED (2) that emits light; a translucent cover (5) that surrounds the LED (2) in a light emitting direction; a fan (7) that is used for cooling; a gas discharge part (S1) that discharges a gas caused to flow by the fan (7) toward the vicinity of the surface (5a) of the cover (5) outside the cover (5); and a hood (81) that surrounds a part of the cover (5) all around, wherein the gas discharge part (S1) has an opening formed between the end (81a) of the hood (81) and the outer peripheral surface (5a) of the cover (5).

Description

LED lamp

This invention relates to an LED lamp.

2. Description of the Related Art Conventionally, a lamp using an LED that can be used as an alternative to a light bulb is provided with a heat sink attached to a substrate on which the LED is provided, and suppresses an increase in the temperature of the LED due to the heat generated by the LED. Life expectancy was suppressed.

Furthermore, in a high-power LED lamp, a plurality of heat radiation fins are provided around the heat radiator, and a fan for cooling the heat radiator is also provided.

Further, for example, as in the invention described in Patent Document 1, the airflow flowing into the duct portion 14 from the opening 10a by driving the blower fan 20 circulates along the heat radiating plate 13 and is sent out through the opening 10a. Some of the airflow channels were devised.

However, since the LED is covered with a glove (cover), the inside of the cover is very hot due to the influence of heat generated by the LED. And since this influence affects the whole LED lamp, there was a limit in suppression of a temperature rise in the heat radiation by a heat radiator.

JP 2013-254576 A

This invention aims at providing the LED lamp which suppresses the temperature rise in a cover in view of the above-mentioned problem.

The present invention includes an LED that emits light, a light-transmitting cover that surrounds the periphery of the light emission direction of the LED, and a fan that is used for cooling, and the gas flowing by the fan is outside the cover. It is an LED lamp provided with the gas discharge | release part discharged | emitted toward the surface vicinity of a cover, It is characterized by the above-mentioned.

This invention can provide an LED lamp that suppresses the temperature rise in the cover.

The front view of a LED lamp. The disassembled perspective view of an LED lamp. The longitudinal cross-sectional perspective view of a LED lamp. The perspective view of the holding body of a LED lamp. The longitudinal cross-sectional perspective view which expanded a part of LED lamp. The front view which shows the flow of the air by the front view of an LED lamp.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

<Overall configuration>
<Overall configuration / Appearance>
FIG. 1 is a front view of the LED lamp 1, FIG. 2 is an exploded view of the LED lamp 1, and FIG. 3 is a longitudinal sectional perspective view of the LED lamp 1. FIG. 4 is a perspective view of the holder 4 of the LED lamp 1.

As shown in FIG. 1, the LED lamp 1 is a so-called light bulb-shaped lamp that uses an LED 2 (see FIG. 3) mounted on a socket as a light source, and is substantially opposite to a vertically long and substantially dome-shaped translucent cover 5. A truncated cone-shaped storage case 8 and a trumpet-shaped base mold 61 to which the base 6 is attached are arranged in a line in this order.

As shown in FIG. 3, the housing case 8 is provided with a holding body 4 to which a substrate 3 on which the LEDs 2 are surface-mounted is attached. A surface 31 on the LED 2 side of the holder 4 is covered with a cover 5. In addition, a cooling fan 7 is accommodated inside the housing case 8 on the base 6 side of the holder 4.

<Internal structure>
≪LED / Board≫
The LED lamp 1 is a COB (Chip On Board) type LED 2 in which an LED 2 that emits light is surface-mounted on a substrate 3. Here, in the LED 2, for example, a plurality of blue LED chips (not shown) are arranged in a planar shape on the surface 31 of the substrate 3, and the surface of the blue LED chip is covered with a yellow phosphor (not shown). An LED 2 that emits white light can be used. The number of blue LED chips used is selected according to the specifications of the LED lamp 1, for example, the total luminous flux, and the supply power is also determined at the same time.

The substrate 3 is made of a metal material such as aluminum having a good thermal conductivity, or an appropriate material such as a ceramic material. The substrate 3 is a substantially hexagonal flat plate, and the LED 2 is mounted on the surface 31 as described above. The LEDs 2 are arranged in a circle at the central portion 31 a of the surface 31 of the substrate 3. The substrate 3 is closely attached and screwed so that the entire back surface 32 is in surface contact with the upper surface 41 b of the holder body 41 of the holder 4. The LED 2 mounted on the substrate 3 is electrically connected to the base 6 by electrical wiring (not shown) passed through a through hole 41 a provided in the holder body 41.

≪Holding body≫
The holding body 4 is made of a metal material such as aluminum having good thermal conductivity. The holding body 4 is integrally formed of a holding body main body portion 41, a peripheral wall portion 42, and a plurality of swirling flow forming bodies 43 (see FIG. 4).

The holding body main body 41 is a perfect circular plate-like body that is larger than the substrate 3 that is in surface contact with the upper surface 41b. On the upper surface 41 b side of the outer peripheral end 41 c of the holding body main body 41, an inverted frustoconical cylindrical peripheral wall portion 42 is provided that extends obliquely outward and upward from the outer peripheral end 41 c.

As described above, in the peripheral wall portion 42, the lower end 42a on the reduced diameter side is closed by the holder body portion 4, but the upper end 44 on the enlarged diameter side is open.

The swirl flow forming body 43 is a curved plate-like body, and stands upright on the lower surface 41d side of the holding body main body 41 with respect to the holding body main body 41, and has a radius from the vicinity of the center 41e of the holding body main body 41. The outer end 43 a of the swirl flow forming body 43 is in contact with the outer peripheral end 41 c of the holding body main body 41.

≪Cover≫
The LED lamp 1 includes a cover 5 that covers the surface 31 of the substrate 3 on which the LED 2 is mounted and is attached to the upper end 44 of the peripheral wall portion 42 of the holding body 4. The cover 5 is made of a plastic material such as polycarbonate, and has a light-transmitting property that transmits light emitted from the LED 2. The cover 5 includes a substantially cylindrical body portion 51 having a constant diameter and a hemispherical cap portion 52 connected to the upper end 51 a of the body portion 51. In the cover 5, the lower end 51 b of the body part 51 is fitted to the upper end 44 of the peripheral wall part 42 of the holding body 4, and the surface of the outer surface 51 c of the body part 51 of the cover 5 and the outer surface 42 b of the peripheral wall part 42 of the holding body is It comes to fit.

≪Fan / container case≫
The fan 7 includes a motor 71 disposed in the center and a plurality of blades 72 provided around the axis of the motor 71. This fan 7 is an axial fan in which air flows linearly along the machine axis when rotating. The fan 7 is arranged so that the direction of the axis is substantially perpendicular to the holding body main body 41 of the holding body 4 and the center 41e of the holding body main body 41 is on the extension line of the axis. It is spaced apart and fixed to the lower surface 41d side of the holding body main body 41 with screws. Accordingly, the fan 7 is arranged such that the plurality of blades 72 face the vicinity of the center 41 e of the holding body main body 41 of the swirling flow forming body 43.

The housing case 8 is extended from the upper end 83a of the fan housing portion 83 in the radial direction by the substantially cylindrical fan housing portion 83 in which the upper and

lower ends

83a and 83b that house the fan 7 are opened. A donut-shaped disk-shaped annular upward flow forming plate 82 that is parallel to the body main body 41 and spaced from the swirling flow forming body 43, and obliquely upward and outward from the outer peripheral end 82 a of the annular upward flow forming plate 82. A substantially inverted truncated cone-shaped hood portion 81 that is extended and slightly curved outward is provided. The housing case 8 is fixed to the lower surface 41d side of the holding body main body 41 with screws.

FIG. 5 is an enlarged longitudinal sectional perspective view of a part of the LED lamp 1.
As shown in FIG. 5, the hood portion 81 includes at least an outer end portion 43 a of the swirl flow forming body 43 that contacts the outer peripheral end 41 c of the holding body main body portion 41, and an outer surface 42 b of the peripheral wall portion 42 of the holding body 4. The outer surface 51c in the vicinity of the lower end 51b of the body portion 51 of the cover 5 fitted to the upper end 44 of the peripheral wall portion 42 is spaced apart from the outside and surrounded. Note that the gap between the outer surface 51c near the lower end 51b of the body portion 51 of the cover 5 and the end portion 81a of the hood portion 81 covers the air sucked into the LED lamp 1 by the fan 7 (not shown). It functions as a gas discharge part S1 that discharges toward the vicinity of the outer surface 5a of the cover 5 (the outer surface 51c of the body part 51).

The gas discharge portion S1 is a region sandwiched between the inner peripheral surface 81b of the hood portion 81 and the outer surface 51c near the lower end 51b of the body portion 51 of the cover 5. This region is formed so as to be narrower than the gas flow path so far, and is configured to release air vigorously. That is, the gas discharge part S1 formed by the inner peripheral surface 81b of the hood part 81 and the outer surface 51c of the cover 5 is a distance from the position of the gap width W2 to the position of the end part 81a of the hood part 81 having the gap width W1. However, it is formed larger than the gap width W1 and is preferably formed twice or more, more preferably three times or more. With such a configuration, the gas can flow for a long time with a narrow width and can be stably discharged from the body discharge portion S1. Further, the flow path leading to the gas discharge part S1 is shown in a shape that slightly expands outward as it goes upward, but is formed so as to be parallel or substantially parallel to the machine axis in the vicinity of the last end part 81a. Thereby, the released air can be made to follow the outer surface of the cover 5 as much as possible. Further, the gap width W 1 of the gas discharge portion S 1 is formed to be 1/10 or less of the diameter of the cover 5. For this reason, the gas discharge part S1 can discharge air at a sufficiently high speed.

≪Base mold / Base≫
The base mold 61 has an upward trumpet shape, and the upper end 61a on the enlarged diameter side is attached to the lower end 8a of the housing case 8 and communicates with the fan housing portion 83 of the housing case 8 (see FIGS. 1 to 3 and 5). . In the die mold 61, a turning-type die 6 is attached to a lower end 61b on the reduced diameter side. The base mold 61 is provided with a plurality of vertically long openings 65 on the side surface 66. The opening 65 functions as an air inlet 65 that sucks air into the LED lamp 1 by the fan 7.

<Air flow>
FIG. 5 schematically shows the flow of air flowing inside the LED lamp 1.
FIG. 6 schematically shows the flow of air flowing outside the LED lamp 1 as viewed from the front.

Air K sucked into the LED lamp 1 by a fan 7 (not shown) accommodated in the fan accommodating portion 83 through a plurality of openings (intake ports) 65 provided in the side surface portion 66 of the base mold 61. Flows linearly upward along the axial center of the fan accommodating portion 83 and reaches the vicinity of the center 41e on the lower surface 41d side of the holder body portion 41 of the holder 4.

Thereafter, the air K passes along the swirl flow forming body 43 in the gap S3 between the adjacent swirl flow forming bodies 43 provided radially outward from the vicinity of the center 41e on the lower surface 41d side of the holding body main body 41. The air K1 flowing in a curved shape, and the clearance S4 between the swirl flow forming body 43 and the donut-shaped disk-shaped annular upward flow forming plate 82 are radially outward along the annular upward flow forming plate 82. And the air K2 that spreads radially and flows.

After that, when the air K1 reaches the outer end 43a of the swirl flow forming body 43, it becomes a swirl flow that flows in the circumferential direction along the inner peripheral surface 81b of the hood portion 81.

On the other hand, when the air K2 reaches the vicinity of the outer peripheral end 82a of the annular upward flow forming plate 82, the air K2 becomes an upward upward flow along the inner peripheral surface 81b of the hood portion 81.

The air K1 that has turned into a swirling flow is pushed upward (to the region L1 in FIG. 5) by the annular upward air K2 that flows along the inner peripheral surface 81b of the hood portion 81 below the air K1. In the region L1, the air K1 and the air K2 are merged and mixed to form a spiral flow that spirally rises along the inner peripheral surface 81b of the hood portion 81.

The spiral air flows from the gap between the end portion 81a of the hood portion 81 and the outer surface 51c in the vicinity of the lower end 51b of the body portion 51 of the cover 5 (gas release portion S1) to the outer surface 51c of the body portion 51. It is discharged toward the vicinity, and rises while spirally spiraling on the outer surface 51c of the body portion 51 (see FIG. 6). As a result, the spiral air swirling around the outer surface 51 c of the body portion 51 cools the body portion 51 of the cover 5 and further the entire cover 5, and suppresses the temperature rise in the cover 5.

The vertical width W3 of the gap S3 in which the swirling air K1 flows (same as the vertical width of the swirling flow forming body 43) and the vertical width W4 of the gap S4 in which the air K2 forming the annular upward flow flows (swirl). The spiral angle θ of the spiral flow can be changed by adjusting the ratio between the flow forming body 43 and the annular upward flow forming plate 82 (same as the separation distance). The longitudinal width ratio (W3 / W4) is preferably from 0.1 to 10, and more preferably from 0.25 to 4. Thereby, the spiral flow of spiral angle (theta) suitable for suppression of the temperature rise in the cover 5 can be formed.

The gap width W2 of the gap S2 between the outer peripheral end 41c of the holding body main body 41 and the inner peripheral surface 81b of the hood 81 is formed to be the same width (or substantially the same width) over the entire circumference. Is smaller than the sum (W3 + W4) of the vertical width W3 and the vertical width W4, and in this embodiment, it is less than half. Further, the gap width W1 of the gap (gas releasing part S1) between the end part 81a of the hood part 81 and the outer surface 51c in the vicinity of the lower end 51b of the body part 51 of the cover 5 is the same (or the same width (or The gap width W2 is smaller than the gap width W2 described above, and is less than half in this embodiment. Therefore, the swirling air K1 that passes through the region of the gap S3 having the vertical width W3 and the air K2 that forms an annular upward flow that passes through the region of the gap S4 having the vertical width W4 are separated by the gap having the narrow gap W2. After passing through the S2 region, they are merged and mixed, and discharged from the gas discharge part S1 having a narrower gap width W1 toward the vicinity of the outer surface 51c of the body part 51. During this time, the flow path width of the flowing air is narrowed stepwise, so that the air flow rate increases stepwise, and the finally released air becomes a jet with a high flow rate. In addition, the air K1 and K2 flowing in this manner is a swirling flow that is curved and curved from the center to the outer periphery by the swirling flow forming body 43, and is thus released to swirl under the influence of the swirling flow. . The air released as a jet in this way rises while spiraling around the outer surface of the body part 51, so that the outside air near the outer surface of the body part 51 is also involved. Thereby, the cooling efficiency of the whole cover 5 including the trunk | drum 51 is improved further. The rate of increase in the flow velocity of the released air is mainly determined by the ratio ((W3 + W4) / W2) and the ratio (W2 / W1). The ratio ((W3 + W4) / W2) is preferably 2 to 12, and more preferably 3 to 8. Further, the ratio (W2 / W1) is preferably 1.3 to 7, and more preferably 1.5 to 5.

In addition, since the holding body main body 41, the peripheral wall portion 42, and the swirl flow forming body 43 of the holding body 4 are formed of a material having good thermal conductivity, they also function as a heat sink. The temperature rise in the cover 5 can also be suppressed when the flowing air directly cools them.

The LED lamp 1 which suppresses the temperature rise in a cover can be provided by the above structure and operation | movement.
More specifically, the LED lamp 1 includes an LED 2 that emits light, a translucent cover 5 that surrounds the light emitting direction of the LED 2, and a fan 7 that is used for cooling. It has a gas discharge part S1 that discharges air) outside the cover 5 toward the vicinity of the outer surface 5a of the cover 5. For this reason, the outer surface 5a of the cover 5 having a relatively large surface area can be directly cooled, and thereby, the temperature rise in the cover 5 can be efficiently suppressed.

The LED lamp 1 includes a hood portion 81 that surrounds a part of the cover 5, and the gas discharge portion S 1 is an opening (gap between the end portion 81 a of the hood portion 81 and the outer peripheral surface 5 a of the cover 5. )have. Here, the hood portion 81 functions as a guide that determines the direction of the gas released toward the vicinity of the outer surface 5 a of the cover 5 outside the cover 5. For this reason, the gas discharged from the gas discharge part S 1 becomes difficult to be dispersed, and most of the gas is used for cooling the cover 5.

The LED lamp 1 includes a turning guide (swirl flow forming body) 43 for turning the air flow generated by the fan 7 before the gas flowing by the fan 7 reaches the gas discharge part S1. The swivel guide 43 is formed by a spiral guide 43 as viewed in the light irradiation direction of the LED 2, and the hood portion 81 allows the gas spread in a spiral shape by the swivel guide 43 to be removed from the cover 5. A gas flow path L1 that guides to the opening (gas discharge part S1) toward the vicinity of the outer surface 5a is provided. Since the gas flow path L1 is provided, the gas sucked by the fan 7 is easily guided to the vicinity of the outer surface 5a of the cover 5 even after becoming a gas expanded in a spiral shape. The cooling efficiency of the cover 5 is improved.

In the LED lamp 1, the cover 5 has a cylindrical part (body part) 51 whose outer diameter does not change, and the gas discharge part S 1 is a cylinder that allows the gas flowing by the fan 7 to flow outside the cylindrical part 51. The shape portion 51 is discharged toward the vicinity of the outer surface 51c. For this reason, the gas expanded in a spiral shape released toward the vicinity of the outer surface 51c of the cylindrical portion 51 of the cover 5 is likely to flow along the outer surface 51c. Thereby, the cooling efficiency of the cover 5 is improved.

In addition, since the air is discharged along the surface of the cover 5 as much as possible, the flow of gas around the cover 5 can be surely promoted and the cooling effect can be enhanced. Moreover, since the gap width W1 of the part used as the last discharge | release position is sufficiently narrower than the gap until then, gas discharge part S1 can discharge | release air vigorously.

Note that the present invention is not limited to this embodiment, and may be various other embodiments.

The present invention can be used in the lighting industry using LEDs.

1 ... LED lamp 2 ... LED
DESCRIPTION OF SYMBOLS 3 ... Board | substrate 4 ... Holding body 5 ... Cover 6 ... Base 7 ... Fan 8 ... Housing case 41 ... Holding body main-body part 42 ... Circumferential wall part 43 ... Swirling flow formation body 51 ... Body part 52 ... Cap part 61 ... Base mold 81 ... Hood part 82 ... annular upward flow forming plate 83 ... fan housing part

Claims

An LED that emits light;
A light-transmitting cover surrounding the periphery of the light emission direction of the LED;
And a fan used for cooling,
The LED lamp provided with the gas discharge | release part which discharge | releases the gas which flows with the said fan toward the surface vicinity of the said cover outside the said cover.
A hood that surrounds a portion of the cover;
The LED lamp according to claim 1, wherein the gas discharge portion has an opening formed between an end portion of the hood and an outer peripheral surface of the cover.
The LED lamp according to claim 2, further comprising a turning guide for turning the flow of air generated by the fan before the gas flowing by the fan reaches the gas discharge portion.
The turning guide is formed by a spiral guide when viewed in the light irradiation direction of the LED,
The LED lamp according to claim 3, wherein the hood includes a gas flow path that guides the gas expanded in a spiral shape by the swivel guide to the opening near the surface of the cover outside the cover.
The cover has a cylindrical portion whose outer diameter does not change,
5. The LED lamp according to claim 1, wherein the gas discharge unit is configured to discharge the gas flowing by the fan toward the vicinity of the surface of the cylindrical portion outside the cylindrical portion. .