CN110998172A

CN110998172A - LED lamp

Info

Publication number: CN110998172A
Application number: CN201880037297.5A
Authority: CN
Inventors: 林弘久
Original assignee: Polaris Co ltd
Current assignee: Polaris Co ltd
Priority date: 2017-06-06
Filing date: 2018-05-30
Publication date: 2020-04-10
Also published as: JP2018206629A; WO2018225606A1; JP6581148B2; KR20200015491A

Abstract

Provided is an LED lamp, which can restrain the temperature rise in a cover. The LED lamp (1) is provided with: an LED (2) that emits light; a light-transmitting cover (5) that surrounds the periphery of the LED (2) in the direction of light emission; and a fan (7) for cooling, the LED (2) having: a gas discharge unit (S1) for discharging the gas that has flowed by the fan (7) outside the cover (5) to the vicinity of the surface (5a) of the cover (5); and a hood portion (81) surrounding a part of the lid (5) in a surrounding manner, the gas discharge portion (S1) having an opening formed between an end portion (81a) of the hood portion (81) and an outer peripheral surface (5a) of the lid (5).

Description

LED lamp

Technical Field

The invention relates to an LED lamp.

Background

Conventionally, in a lamp using an LED that can be used in place of a light bulb, a heat sink is attached to a substrate on which the LED is provided, and temperature rise of the LED due to heat generated by the LED is suppressed, thereby suppressing decrease in light output of the LED and shortening of the life.

In addition, in the high-power LED lamp, a plurality of heat radiating fins are provided around the heat radiating body, and a fan for cooling the heat radiating body is also provided.

Further, for example, as in the invention described in patent document 1, there is also an invention in which the following contrivances are made with respect to the gas flow path: the airflow passage causes the airflow flowing from the opening 10a into the duct portion 14 by driving of the blower fan 20 to flow along the heat dissipation plate 13 and to be sent out through the opening 10 a.

However, since the LED is covered with the lamp cover (cover), the inside of the cover is affected by heat emitted from the LED, and the temperature becomes very high. Since this influence is exerted on the entire LED lamp, the heat radiation from the heat radiator is limited to suppress the temperature rise.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-254576

Disclosure of Invention

Problems to be solved by the invention

In view of the above problems, an object of the present invention is to provide an LED lamp that suppresses a temperature rise in a cover.

Means for solving the problems

The present invention is characterized by an LED lamp having: an LED that emits light; the LED lamp includes a translucent cover surrounding a periphery of the LED in a light emission direction, and a fan for cooling, and the LED lamp includes a gas discharge portion for discharging gas flowing by the fan to a vicinity of a surface of the cover outside the cover.

Effects of the invention

According to the present invention, an LED lamp in which a temperature rise in the cover is suppressed can be provided.

Drawings

Fig. 1 is a front view of an LED lamp.

Fig. 2 is an exploded perspective view of the LED lamp.

Fig. 3 is a longitudinal sectional perspective view of the LED lamp.

Fig. 4 is a perspective view of a holder for an LED lamp.

Fig. 5 is an enlarged vertical sectional perspective view of a part of the LED lamp.

Fig. 6 is a front view showing an air flow when the LED lamp is viewed from the front.

Detailed Description

An embodiment of the present invention will be described below with reference to the accompanying drawings.

Example 1

< integral Structure >

< overall Structure/appearance >

Fig. 1 is a front view of an LED lamp 1, fig. 2 is an exploded view of the LED lamp 1, and fig. 3 is a vertical 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 bulb-shaped lamp in which an LED2 (see fig. 3) used by being attached to a socket is used as a light source, and in the LED lamp 1, a long, substantially arch-shaped, light-transmitting cover 5, a substantially inverted circular truncated cone-shaped housing case 8, and a trumpet-shaped base material 61 to which a base 6 is attached are arranged in this order.

As shown in fig. 3, a holding body 4 is provided on the housing case 8, the substrate 3 is mounted on the holding body 4, and the LED2 is mounted on the front surface of the substrate 3. The front surface 31 of the holder 4 on the LED2 side is covered with a cover 5. Further, a cooling fan 7 is housed inside the housing case 8 on the base 6 side of the holding body 4.

< internal Structure >

LED/substrate

In the LED lamp 1, as the LED2 that emits light, a COB (Chip on board) type LED2 mounted on the front surface of the substrate 3 is used. Here, as the LED2, for example, the following LED2 can be used: the LEDs 2 emit white light by disposing a plurality of blue LED chips (not shown) in a planar shape on the front surface 31 of the substrate 3 and coating the surfaces of the blue LED chips with a yellow phosphor (not shown). The number of blue LED chips to be used is selected according to the specification of the LED lamp 1, for example, the total luminous flux, and the supply power is determined.

The substrate 3 is made of a suitable material such as a metal material having high thermal conductivity, e.g., aluminum, or a ceramic material. The substrate 3 is a substantially hexagonal flat plate, and the LED2 is mounted on the front surface 31 thereof as described above. The LED2 is circularly disposed in the center portion 31a of the front surface 31 of the substrate 3. The entire back surface 32 of the substrate 3 is in surface contact with the upper surface 41b of the holder main body 41 of the holder 4, and is fixed to the upper surface 41b by screwing. The LED2 mounted on the substrate 3 is electrically connected to the base 6 by an electric wire (not shown) passing through the through hole 41a provided in the holder body 41.

Holding body

The holder 4 is made of a metal material having high thermal conductivity, such as aluminum. The holder 4 is integrally formed by the holder main body portion 41, the peripheral wall portion 42, and the plurality of swirl flow-forming bodies 43 (see fig. 4).

The holder main body 41 is a plate-like body having a circular shape larger than the substrate 3 with which the upper surface 41b is in surface contact. A peripheral wall portion 42 in the form of an inverted circular truncated cone is provided on the upper surface 41b side of the outer peripheral end 41c of the holder body 41, and the peripheral wall portion 42 extends obliquely upward and outward from the outer peripheral end 41 c.

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

The swirling airflow forming body 43 is a curved plate-like body, is provided to stand substantially perpendicularly to the holder main body 41 on the lower surface 41d side of the holder main body 41, and is provided in a radial shape curved outward in the radial direction from the vicinity of the center 41e of the holder main body 41, and the outer end 43a of the swirling airflow forming body 43 abuts against the outer peripheral end 41c of the holder main body 41.

Cover(s)

The LED lamp 1 includes a cover 5, the cover 5 covers the front surface 31 of the substrate 3 on which the LED2 is mounted, and the cover 5 is attached to an 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 to transmit light emitted from the LED 2. The cap 5 includes a substantially cylindrical body 51 having a constant diameter and a hemispherical cap 52 connected to an upper end 51a of the body 51. The lower end 51b of the body portion 51 of the cap 5 is fitted to the upper end 44 of the peripheral wall portion 42 of the holding body 4, and the surface of the outer surface 51c of the body portion 51 of the cap 5 is aligned with the surface of the outer surface 42b of the peripheral wall portion 42 of the holding body.

Fan/storage case

The fan 7 has: a motor 71 disposed in the center; and a plurality of blades 72 disposed around a crankshaft of the motor 71. The fan 7 is an axial fan in which air flows linearly along the crankshaft when rotating. The fan 7 is disposed such that the direction of the crankshaft is substantially perpendicular to the holder main body portion 41 of the holder 4, and the center 41e of the holder main body portion 41 is located on the extension line of the crankshaft, and is screwed and fixed to the lower surface 41d side of the holder main body portion 41 so as to be separated from the swirl flow forming body 43. Thus, the fan 7 is disposed such that the plurality of blades 72 face the vicinity of the center 41e of the holder main body portion 41 of the swirl flow-forming body 43.

The housing case 8 has: a substantially cylindrical fan housing portion 83, the fan housing portion 83 housing the fan 7, and having both upper and

lower ends

83a, 83b open; an annular upward airflow forming plate 82 having an annular disc shape, which is provided to extend radially outward from an upper end 83a of the fan housing portion 83, is parallel to the holder body portion 41 of the holder 4, and is separated from the swirling airflow forming body 43; and a substantially inverted circular truncated cone-shaped cover portion 81 extending obliquely upward and outward from an outer peripheral end 82a of the annular upward airflow forming plate 82 and slightly convexly curved outward. The housing case 8 is fixed to the lower surface 41d side of the holder body 41 by screwing.

Fig. 5 is an enlarged vertical sectional perspective view of a part of the LED lamp 1.

As shown in fig. 5, cover 81 surrounds and separates from the outside: an outer end portion 43a of the swirling airflow forming body 43 which is in contact with at least the outer peripheral end 41c of the holding body 41; an outer surface 42b of the peripheral wall portion 42 of the holding body 4, and an outer surface 51c of the cap 5 fitted to the upper end 44 of the peripheral wall portion 42 in the vicinity of the lower end 51b of the body portion 51. The gap between the outer surface 51c of the body 51 of the cover 5 near the lower end 51b and the end 81a of the cover 81 functions as a gas discharge portion S1 through which air sucked into the LED lamp 1 by the fan 7 (not shown) is discharged outside the cover 5 to the vicinity of the outer surface 5a of the cover 5 (the outer surface 51c of the body 51).

The gas discharge portion S1 is a region sandwiched between the inner peripheral surface 81b of the cover portion 81 and the outer surface 51c near the lower end 51b of the body portion 51 of the lid 5. This region is formed to be the narrowest as compared with the gas flow passage up to that point, and is configured to strongly discharge air. That is, gas discharge portion S1 formed by inner circumferential surface 81b of cover 81 and outer surface 51c of lid 5 is formed such that the distance from the position of gap width W2 to the position of end 81a of cover 81 as gap width W1 is greater than gap width W1, preferably 2 times or more, and more preferably 3 times or more. With this configuration, the gas can be stably discharged from the gas discharge portion S1 by flowing the gas in a narrow and long space. The flow path leading to the gas discharge portion S1 is formed in a shape that slightly expands outward as it goes upward, but is formed in parallel or substantially parallel to the crankshaft near the rearmost end 81 a. This enables the discharged air to follow the outer surface of the cover 5 as much as possible. The gap width W1 of the gas discharge portion S1 is formed to be one tenth or less of the diameter of the lid 5. Therefore, the gas discharge unit S1 can discharge air sufficiently at high speed.

Lamp head piece/lamp holder

The base member 61 is formed into a horn shape facing upward, and an upper end 61a on the diameter expansion side thereof is attached to a lower end 8a of the storage case 8 and communicates with the fan storage portion 83 of the storage case 8 (see fig. 1 to 3 and 5). A screw-in type base 6 is attached to a lower end 61b of the base member 61 on the diameter-reduced side. The side surface portion 66 of the base 61 is provided with a plurality of vertically long openings 65. The opening 65 functions as an air inlet 65 through which the fan 7 sucks air into the LED lamp 1.

< gas flow >

Fig. 5 schematically shows the air flow flowing inside the LED lamp 1.

Further, fig. 6 schematically shows the air flow flowing outside the LED lamp 1 when viewed from the front.

The air K sucked into the LED lamp 1 by the fan 7 (not shown) housed in the fan housing 83 through the plurality of openings (air inlets) 65 provided in the side surface portion 66 of the base member 61 flows linearly upward along the axial center of the fan housing 83, and reaches the vicinity of the center 41e of the holding body 4 on the side of the lower surface 41d of the holding body 41.

Then, the air K is divided into the air K1 and the air K2, the air K1 flows in a curved shape along the swirling airflow forming body 43 in the gap S3 between the adjacent swirling airflow forming bodies 43 provided radially outward in the radial direction from the vicinity of the center 41e on the lower surface 41d side of the holding body main body portion 41, and the air K2 flows in a radially expanded outward in the radial direction along the annular upward airflow forming plate 82 in the gap S4 between the swirling airflow forming body 43 and the annular upward airflow forming plate 82 in the form of an annular disc.

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 circumferential surface 81b of the cover portion 81.

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

Air K1 that has become the swirling air flow is pushed up upward (region L1 in fig. 5) by air K2 that is a circular upward air flow flowing along inner circumferential surface 81b of cover 81 below air K1. In the region L1, the air K1 and the air K2 merge and mix together, and become a spiral air flow that spirally rises along the inner circumferential surface 81b of the cover part 81.

The air that has become the spiral flow is discharged from the gap (gas discharge portion S1) between the end portion 81a of the cover portion 81 and the outer surface 51c of the body portion 51 of the lid 5 in the vicinity of the lower end 51b to the vicinity of the outer surface 51c of the body portion 51, and swirls spirally upward on the outer surface 51c of the body portion 51 (see fig. 6). Accordingly, the air as the spiral air flow swirling on the outer surface 51c of the body 51 cools the body 51 of the lid 5 and the entire lid 5, and the temperature rise in the lid 5 is suppressed.

Further, the helix angle θ of the helical airflow can be changed by adjusting the ratio of the longitudinal width W3 (the same as the longitudinal width of the swirling airflow forming body 43) of the gap S3 through which the air K1 as the swirling airflow flows and the longitudinal width W4 (the same as the distance separating the swirling airflow forming body 43 and the annular upward airflow forming plate 82) of the gap S4 through which the air K2 forming the annular upward airflow flows. The ratio of the longitudinal widths (W3/W4) is preferably 0.1 to 10, more preferably 0.25 to 4. This makes it possible to form a spiral air flow having a spiral angle θ suitable for suppressing a temperature increase in the lid 5.

The gap width W2 of the gap S2 between the outer peripheral end 41c of the holder body 41 and the inner peripheral surface 81b of the cover 81 is formed to have the same width (or substantially the same width) around the entire circumference, is smaller than the sum (W3+ W4) of the longitudinal width W3 and the longitudinal width W4, and is formed to be half or less in the present embodiment. The gap width W1 of the gap (gas discharge portion S1) between the end portion 81a of the cover portion 81 and the outer surface 51c near the lower end 51b of the body portion 51 of the lid 5 is formed to have the same width (or substantially the same width) around the entire circumference, is smaller than the gap width W2, and is formed to be half or less in the present embodiment. Therefore, the air K1 as the swirling airflow passing through the region of the gap S3 with the vertical width W3 and the air K2 forming the annular upward airflow passing through the region of the gap S4 with the vertical width W4 merge and mix after passing through the region of the gap S2 with the narrow gap width W2, and are then discharged from the gas discharge portion S1 with the narrow gap width W1 to the vicinity of the outer surface 51c of the body portion 51. In this period, since the width of the flow path through which the air flows is gradually narrowed, the flow velocity of the air is gradually increased, and the air to be discharged finally becomes an air jet having a large flow velocity. The air K1, K2 flowing in this manner becomes a swirl flow that is curved from the center to the outer periphery by the swirl flow forming body 43 and spreads at the same time, and is therefore discharged in a swirl manner under the influence of this swirl flow. The air thus formed into a jet flow and discharged swirls spirally upward on the outer surface of the body portion 51, and therefore, the outside air around the outer surface of the body portion 51 is also entrained. This further improves the cooling efficiency of the entire lid 5 including the body portion 51. The rate of increase in the flow velocity of the discharged air is mainly determined by the ratio ((W3+ W4)/W2) and the ratio (W2/W1). The ratio ((W3+ W4)/W2) is preferably 2-12, and more preferably 3-8. In addition, the ratio (W2/W1) is preferably 1.3 to 7, and more preferably 1.5 to 5.

The holder main body 41, the peripheral wall 42, and the swirl flow-forming body 43 of the holder 4 are made of a material having good thermal conductivity, and therefore function also as heat sinks. Even if they are directly cooled by the flowing air, the temperature rise in the lid 5 can be suppressed.

According to the above configuration and operation, the LED lamp 1 can be provided in which the temperature rise in the cover is suppressed.

Specifically, the LED lamp 1 includes: an LED2 that emits light; a translucent cover 5 surrounding the periphery of the LED2 in the light emission direction; and a fan 7 for cooling, wherein the LED lamp 1 includes a gas discharge portion S1, and the gas discharge portion S1 discharges gas (air) flowing by the fan 7 to the vicinity of the outer surface 5a of the cover 5 outside the cover 5. Therefore, the outer surface 5a of the lid 5 having a relatively large surface area can be directly cooled, and thus the temperature rise in the lid 5 can be more effectively suppressed.

The LED lamp 1 has a hood portion 81 that surrounds a part of the surrounding cover 5, and the gas discharge portion S1 has an opening (gap) formed between an end 81a of the hood portion 81 and the outer circumferential surface 5a of the cover 5. Here, the cover 81 functions as a guide for directing the gas discharged outside the lid 5 toward the vicinity of the outer surface 5a of the lid 5. Therefore, the gas discharged from the gas discharge portion S1 is hardly dispersed, and the gas is used for cooling the lid 5 in a large amount.

The LED lamp 1 includes a swirling guide (swirling-flow-forming body) 43, and the swirling guide (swirling-flow-forming body) 43 swirls the airflow generated by the fan 7 before the gas flowing by the fan 7 reaches the gas discharge portion S1. The swirl guide 43 is formed by the guide 43 having a spiral shape when viewed from the light irradiation direction of the LED2, and the cover 81 has a gas flow passage L1, and the gas flow passage L1 guides the gas expanded in a spiral shape by the swirl guide 43 to the vicinity of the outer surface 5a of the cover 5 outside the cover 5 to the opening (gas discharge portion S1). 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 lid 5 even after becoming a gas spreading in a spiral shape, thereby improving the cooling efficiency of the lid 5.

In the LED lamp 1, the cover 5 has a cylindrical portion (body portion) 51 having a constant outer diameter, and the gas discharge portion S1 is configured to discharge the gas flowing by the fan 7 to the vicinity of the outer surface 51c of the cylindrical portion 51 outside the cylindrical portion 51. Therefore, the gas discharged to the vicinity of the outer surface 51c of the cylindrical portion 51 of the lid 5 and expanding in a spiral shape easily flows along the outer surface 51 c. This improves the cooling efficiency of the lid 5.

Further, since the air is discharged along the surface of the lid 5 as much as possible, the flow of the gas around the lid 5 can be reliably promoted, and the cooling effect can be improved. Further, the gap width W1 of the portion of the gas discharging portion S1 which is the final discharge position is sufficiently narrower than the gap before that, and therefore, air can be discharged strongly.

The present invention is not limited to this embodiment, and various other embodiments can be adopted.

Industrial applicability

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

Description of the reference symbols

1: an LED lamp; 2: an LED; 3: a substrate; 4: a holding body; 5: a cover; 6: a lamp cap; 7: a fan; 8: a housing case; 41: a holding body main body part; 42: a peripheral wall portion; 43: a swirl flow-forming body; 51: a body portion; 52: a cap portion; 61: a base member; 81: a cover portion; 82: an annular upward flow-forming plate; 83: a fan housing part.

Claims

1. An LED lamp having:

an LED that emits light;

a light-transmitting cover surrounding the periphery of the LED in the light emission direction; and

a fan for cooling the air, wherein the fan is used for cooling,

the LED lamp has a gas discharge unit that discharges gas flowing by the fan to the vicinity of the surface of the cover outside the cover.

2. The LED lamp of claim 1,

the LED lamp has a cover portion surrounding a portion of the cover in a surrounding manner,

the gas discharge portion has an opening formed between an end of the hood portion and an outer circumferential surface of the cover.

3. The LED lamp of claim 2,

the LED lamp has a swirling guide that swirls the airflow generated by the fan before the gas flowing by the fan reaches the gas discharge unit.

4. The LED lamp of claim 3,

the swirl guide is formed of a guide having a swirl shape when viewed from the direction of light irradiation of the LED,

the cover portion has a gas flow passage that guides gas, which is expanded in a spiral shape by the swirl guide, to the opening toward the vicinity of the surface of the cover outside the cover.

5. The LED lamp of any of claims 1 to 4, wherein:

the cap has a cylindrical portion of constant size of outer diameter,

the gas discharge unit is configured to discharge the gas flowing by the fan to the vicinity of the surface of the cylindrical portion outside the cylindrical portion.