KR20160014437A - Led lamp - Google Patents

Abstract

The present invention relates to an LED lamp having a cooling fan. The LED lamp according to the present invention includes a mounting plate which has an LED module on a lower surface, a heat sink which has one end installed on the upper surface of the mounting plate and has cooling fins, a first fan installed at the other end of the heat sink, a second fan separated from the upper part of the first fan by a predetermined distance, an LED driver which includes an LED module and a driving circuit for driving the first fan and the second fan, and a housing which has an accommodating space for accommodating the heat sink, the first and the second fan, and the LED driver. The housing has first ventilation holes formed along the circumference direction in the lower end part of the heat sink and second ventilation holes formed along the circumference direction in the upper end part of the heat sink.

Description

LED lamp {LED lamp}

The present invention relates to an LED lamp (Light Emitting Diode lamp). And more particularly, to an LED lamp having a fan for cooling.

In recent years, LEDs with high energy conversion efficiency of electric energy and energy-saving and environment-friendly effects have been increasingly used for general illumination as a next generation high efficiency light source. However, since more than 50% of the power supplied to the LED is converted into thermal energy, the temperature of the LED increases due to heat during use, resulting in a problem that the light output is decreased or the light wavelength is shifted. In addition, the generated heat sharply reduces the lifetime of the LED, thereby deteriorating the reliability of the product. Therefore, a variety of heat sinks have been developed and used for heat dissipation of LED lighting.

Among the radiators, a radiator using natural convection is widely used. A heat radiator utilizing natural convection is disclosed in Korean Patent Laid-Open No. 10-2012-0136687 entitled " LED lighting device and its manufacturing method ", Korean Patent No. 10-1129524 "LED lamp module with heat- &Quot; LED illumination "and the like.

There is a disadvantage in that, when an LED lamp is manufactured by using a radiator using natural convection, the size of the lamp is increased and it can not be downsized. In addition, the larger the output of the lamp, the larger the size of the radiator. Particularly, when a lamp of 100 W or more is manufactured using an LED, such as a factory lamp or a street lamp, the size becomes extremely large when a natural convection type heat radiator is used. Therefore, in order to replace the conventional lamp, the structure for supporting the lamp should be removed as well as the lamp, and a separate structure should be installed.

And the size of the lamp can be reduced when an LED lamp is manufactured using a forced convection type radiator that forcibly flows air to the radiating fins with a device such as a fan. Particularly, a forced-mode radiator is suitable for a high output lamp of 100 W or more, which is increased in size by a radiator. However, if the fan that forcibly flows air breaks or accumulates foreign matter such as dust in the air passage, the cooling performance deteriorates and the LED lamp may be damaged.

An object of the present invention is to provide an LED lamp which can be safely used by reducing the size of an LED lamp by performing forced cooling, preventing a breakdown of the fan, and removing foreign matter accumulated in an air passage.

According to the present invention, a novel structure of an LED lamp is provided. The LED lamp according to the present invention includes a mounting plate having an LED module mounted on a lower surface thereof, a heat sink having one end mounted on an upper surface of the mounting plate and having a plurality of cooling fins formed therein, A second fan installed at a predetermined distance from an upper portion of the first fan, an LED module, and an LED driver including a driving circuit for driving the first fan and the second fan, a heat sink, A plurality of first ventilation holes are formed in a lower end portion of the heat sink along a circumferential direction of the housing, and a plurality of first ventilation holes are formed in a lower end of the heat sink, A plurality of second ventilation holes are formed along the circumferential direction.

The LED driver of the present invention is characterized in that in order to remove foreign matters adhered to the plurality of second vent holes, the LED driver is preferably arranged so that air is sucked through the plurality of first vent holes and discharged through the plurality of second vent holes, So as to rotate the fan and stop the rotation of the first fan.

The LED driver of the present invention is configured to drive at least one of the first fan and the second fan so that air is sucked through the plurality of second vent holes and discharged through the plurality of first vent holes.

The LED driver of the present invention is configured to drive at least one of the first fan and the second fan so that air is sucked through the plurality of first vent holes and discharged through the plurality of second vent holes.

Further, the LED lamp of the present invention further includes a lamp base mounted on the upper side of the housing.

The LED lamp of the present invention further includes a lamp lens coupled to the lower end of the housing to protect the LED module mounted on the lower surface of the mounting plate.

In the LED lamp according to the present invention, a plurality of fans blow foreign substances attached to the ventilation holes to the outside of the housing. Therefore, the air flow in the housing is smoothly guided, so that the cooling performance is improved. In addition, it is possible to prevent the breakdown of the fan caused by the accumulation of foreign matter, thereby improving the heat radiation efficiency and extending the lifetime of the LED lamp.

Further, since the cooling performance and the heat radiation efficiency are excellent, the size of the LED lamp can be made small. Therefore, it is possible to replace the LED lamp only without replacing the structure for supporting the lamp, so that the operation is easy and the replacement cost can be innovatively reduced.

Further, the structure in which a plurality of fans are coupled to the housing is simple, so that the assembly is easy and the production cost can be reduced. Therefore, the LED lamp according to the present invention can be very usefully used for lighting of factories, warehouses, gymnasiums, auditoriums, and the like.

1 is a perspective view illustrating a configuration of an LED lamp according to the present invention.
FIG. 2 is a perspective view illustrating the structure of an LED lamp according to the present invention.
3 is a sectional view taken along the line AA shown in Fig.
Fig. 4 is a cross-sectional view for explaining the air flow when the first fan is operated in Fig. 3; Fig.
Fig. 5 is a cross-sectional view illustrating the air flow when the second fan is operated in Fig. 3;

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the LED lamp according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, an LED lamp 100 according to an embodiment of the present invention includes a housing 110 having a hollow interior. The housing 110 is made of plastic by injection molding. In addition, the housing 110 may be made of a metal having excellent thermal conductivity, for example, an aluminum alloy for heat dissipation. The housing 110 has a hollow accommodation space 111 and an upper open end portion 112 communicating with the accommodation space 111 at an upper portion and a lower open end portion 113 communicating with the accommodation space 111 at a lower portion thereof. ). The male screw 114 is formed by a round screw and is formed on the upper side of the housing 110. The upper open end 112 is formed at the upper end of the male screw 114. The housing 110 extends from the lower end of the male screw 114 so as to expand in cross-sectional area, and a lower open end 113 is formed at the lower end. The seating groove 115 is provided inside the lower open end 113 of the housing 110. A plurality of screw holes (not shown) may be formed so that the screws can be fastened in the circumferential direction of the seating groove 115.

The plurality of first ventilation holes 116 are formed along the circumferential direction at the lower end of the housing 110 so as to communicate with the accommodation space 111. The plurality of second ventilation holes 117 are formed along the circumferential direction at the upper end of the housing 110 so as to communicate with the accommodation space 111. The plurality of first ventilation holes 116 and the second ventilation holes 117 according to the present invention are formed as elongated rectangular holes formed along the longitudinal direction of the housing 110. However, it should be understood that the present invention is not limited thereto and may be formed in various shapes such as a circular shape, an elliptical shape, and a polygonal shape.

A lamp base (118) is coupled to the upper side of the housing (110). The lamp base 118 is formed of a cylindrical screw base having a female screw 118a and a male screw 118b formed on the inner and outer surfaces thereof. The housing 110 and the lamp base 118 are coupled to each other by fastening the male screw 112 and the female screw 118a. The male screw 118b of the lamp base 118 is a power connection mechanism for supplying commercial power and is coupled and connected to a socket by a screw fastening method. When the housing 110 is made of an aluminum alloy, it is preferable that the external thread 112 and the internal thread 118b are insulated by an insulating material in order to prevent electric conduction.

A mounting plate 120 is coupled to the lower end of the housing 110. That is, the upper surface of the mounting plate 120 is partially engaged with the seating groove 115 of the housing 110. A plurality of holes 121 are formed at equal intervals along the circumferential direction at the center of the mounting plate 120 and at the edge of the mounting plate 120. The passage 122 is formed at a position adjacent to the edge of the mounting plate 120. The mounting plate 120 may be made of a material having a high thermal conductivity, for example, aluminum or magnesium. The LED module 130 includes a PCB, a plurality of LEDs and a connector 131, and is mounted on a lower surface of the mounting plate 120.

The heat sink 140 has a cylindrical shape and has one end mounted on the upper surface of the mounting plate 120. A plurality of cooling fins (141) are formed along the circumferential direction with respect to the central axis of the heat sink (140). A plurality of screw holes 142 are formed at equal intervals along the circumferential direction at the center of the heat sink 120. In addition, the cooling fins 141 of the heat sink 140 corresponding to the passages 122 of the mounting plate 120 may be partially removed so that the connector cable can pass therethrough. The plurality of cooling fins 141 of the heat sink 140 according to the present invention are formed parallel to the central axis of the heat sink 140. However, the present invention is not limited thereto and various shapes and shapes can be manufactured.

2 and 3, the LED lamp 100 according to the present invention includes a first fan (not shown) for generating airflow around the heat sink 140 for cooling the heat sink 140 150 are mounted. The lower surface of the first fan 150 is attached to the other end of the heat sink 140, and a plurality of holes 151 are formed at the edges.

The second fan 160 is installed at a predetermined distance from the upper portion of the first fan 150. The second fan 160 has a plurality of second ventilation holes 117 formed at the upper portion of the housing 110 so that the upper end of the second fan 160 is connected to the second ventilation hole 117 to remove foreign matter adhered to the plurality of second ventilation holes 117. [ . The plurality of holes 161 are formed in the corner portions of the second fan 160.

As shown in FIG. 3, a light emitting diode driver 170 is mounted between the first fan 150 and the second fan 160. The LED driver 170 includes an LED module 130 and a driving circuit for driving the first fan 150 and the second fan 160. That is, the power supplied from the lamp base 118 is controlled to operate the LED module 130, the first fan 150, and the second fan 160. A plurality of screw holes 171 are formed in the upper surface of the LED driver 170. The plurality of screws 162 pass through the holes 161 of the second fan 160 and are fastened and fixed to the corresponding screw holes 171 of the LED driver 170. [ However, a washer 163 may be provided between the LED driver 170 and the second fan 160 when the respective screws 162 are fastened. The washer 163 installed in this manner serves to induce the airflow while keeping the gap between the second fan 160 and the LED driver 170 and to stably support the second fan 160 and the LED driver 170 do.

The LED lamp 100 according to the present invention is provided between the first fan 150 and the LED driver 170 so as to smoothly supply air and smoothly support air to the plurality of cooling fins 141 of the heat sink 140. [ A guide plate 180 may be provided. The guide plate 180 is in the shape of a disk and has a spacer 181 on the lower surface thereof so as to be installed in each hole 151 of the first fan 150. The plurality of passages 182 are formed in the circumferential direction with respect to the center of the guide plate 180. A plurality of holes 183 and 184 are formed at regular intervals along the circumferential direction at the center of the guide plate 180.

3, a spacer 181 protruding from the lower surface of the guide plate 180 is inserted into the hole 151 of the first fan 150. As shown in FIG. Each of the screws 185 passes through the hole 183 and the spacer 181 on the upper surface of the guide plate 180 and passes through the hole 151 of the first fan 150 and the cooling pin of the heat sink 140 141). Each of the screws 186 passes through the hole 184 in the lower surface of the guide plate 180 and is engaged with the screw hole (not shown) provided on the lower surface of the LED driver 170 so as not to be separated.

A lamp lens 190 is mounted on the lower end of the housing 110 so as to cover the LED module 130. The lamp lens 190 is formed of a convex lens. A plurality of holes 191 are formed in the edge of the lamp lens 190 so as to be aligned with a plurality of screw holes of the housing 110. A circular rim 192 protrudes from the upper surface of the lamp lens 190 and partially accommodates the lower surface of the mounting plate 120. The lamp lens 190 is coupled to the lower end of the housing 110 by fastening a plurality of screws 193. At this time, a mounting plate 120 on which the LED module 130 is mounted, a heat sink 140, a first fan 150, a guide plate 180, an LED driver 170 and the second fan 160 are firmly coupled to each other.

The LED lamp 100 according to the present invention having such a configuration is configured such that when the lamp base 118 is connected to a socket for supplying commercial power, electric power is supplied to the LED module 130 under the control of the LED driver 170 do. That is, the LED driver 170 is electrically connected to the lamp base 118 by a connector cable. The connector cable connected to the LED driver 170 is electrically connected to the connector 131 of the LED module 130 through the passage 122 of the mounting plate 120. The LED driver 170 is electrically connected by respective connector cables to control the operation of the first fan 150 and the second fan 160. Light generated by the operation of the LED module 130 is reflected through the lens lamp 190. Heat generated during operation of the LED module 130 is absorbed by the heat sink 140 through the mounting plate 120.

3 and 4, when the first fan 150 is operated to cool the heat sink 140, the air passes through the plurality of second ventilation holes 117 formed on the upper side of the housing 110 And then flows into the accommodation space 111. The air flowing into the accommodation space 111 passes through the accommodation space 111 in which the second fan 160, the LED driver 170 and the guide plate 180 are disposed and moves to the first fan 150. When the first fan 150 rotates, the air in the accommodation space 111 is discharged to the space between the cooling fins 121 of the heat sink 120 and is formed on the lower side of the housing 110 after cooling the cooling fins 121 And is discharged to the plurality of first ventilation holes (116). At this time, it is preferable that the second fan 160 is stopped without rotating so that the air can flow smoothly into the accommodation space 111 through the plurality of second ventilation holes 117.

3 and 5, when the second fan 160 is operated to remove foreign matter adhered to the plurality of second ventilation holes 117, the air is guided to the plurality of 1 through the ventilation hole 116 and into the accommodation space 111. The air introduced into the accommodation space 111 flows into the accommodation space 111 in which the cooling fan 141 of the heat sink 140, the first fan 150, the guide plate 180, and the LED driver 170 are disposed And then moves to the second fan 160. When the second fan 160 rotates, the air in the accommodation space 111 passes through the plurality of second ventilation holes 117 and is discharged to the outside of the housing 110, so that the plurality of second ventilation holes 117 The attached foreign matter can be easily removed. At this time, it is preferable that the first fan 150 is stopped without rotating so that air can be smoothly discharged to the outside of the housing 110 through the plurality of second ventilation holes 117.

According to the present invention, the first fan 150 operates at a predetermined time interval to cool the heat sink 140 according to the control signal of the LED driver 170, and the second fan 160 operates at a predetermined time interval, Lt; RTI ID = 0.0 > 117 < / RTI > That is, when the first fan 150 operates for about 2 hours while the second fan 160 is stopped and the second fan 160 operates for about 2 minutes in a state where the first fan 150 is stopped, . However, it is needless to say that the first fan 150 and the second fan 160 can adjust the operation time interval according to the control signal of the LED driver 170 according to the conditions.

Also, according to the present invention, the first fan 150 and the second fan 160 may operate simultaneously according to a control signal of the LED driver 170. [ That is, the air flows into the plurality of second ventilation holes 117, passes through the accommodation space 111 to cool the heat sink 120, and then is discharged to the plurality of first ventilation holes 116 And the second fan 160 simultaneously operate in the forward direction. Therefore, the amount of air passing around the heat sink 140 increases, thereby improving the heat radiation efficiency.

In addition, according to the present invention, in accordance with the control signal of the LED driver 170, the air introduced into the plurality of first ventilation holes 116 passes through the accommodation space 111 to cool the heat sink 120, The first fan 150 and the second fan 160 are simultaneously operated in the reverse direction to be discharged to the second ventilation hole 117. [ Therefore, the foreign substances attached to the plurality of second ventilation holes 117 can be removed more efficiently.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

100: LED lamp 110: housing
120: mounting plate 130: LED module
140: Heat sink 150: First fan
160: Second fan 170: LED driver
180: guide plate 190: lamp lens

Claims (6)

A mounting plate having an LED module mounted on a lower surface thereof,
A heat sink having one end mounted on the upper surface of the mounting plate and having a plurality of cooling fins,
A first fan mounted on the other end of the heat sink,
A second fan installed at a predetermined distance from an upper portion of the first fan,
An LED driver including the LED module, a driving circuit for driving the first fan and the second fan,
And a hollow housing having a receiving space for receiving the heat sink, the first fan, the second fan, and the LED driver,
A plurality of first ventilation holes are formed in a lower end of the heat sink along a circumferential direction of the heat sink and a plurality of second ventilation holes are formed in an upper end of the second fan along a circumferential direction LED lamp. The method according to claim 1,
The LED driver may rotate the second fan at a predetermined time interval so that air is sucked in the first vent holes and discharged to the second vent holes to remove foreign matter adhered to the second vent holes. And stopping the rotation of the first fan. The method according to claim 1,
Wherein the LED driver is configured to drive at least one of the first fan and the second fan so that air is sucked in the second ventilation holes and discharged to the first ventilation holes. The method according to claim 1,
Wherein the LED driver is configured to drive at least one of the first fan and the second fan so that air is sucked in the first ventilation holes and discharged to the second ventilation holes. 5. The method according to any one of claims 1 to 4,
And a lamp base mounted on the upper side of the housing. 6. The method of claim 5,
And a lamp lens coupled to a lower end of the housing to protect the LED module mounted on the lower surface of the mounting plate.

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