CN105864659B

CN105864659B - LED bulb lamp

Info

Publication number: CN105864659B
Application number: CN201510560087.2A
Authority: CN
Inventors: 江涛; 曾志祥
Original assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Current assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Priority date: 2015-02-04
Filing date: 2015-09-06
Publication date: 2020-03-13
Anticipated expiration: 2035-09-06
Also published as: CN105864659A

Abstract

The invention provides an LED bulb lamp, which comprises: the housing includes a top relief channel extending from the housing top end to the housing interior; the driving power supply is positioned at the bottom of the shell; the metal lamp holder is electrically connected with the driving power supply through a lead; the radiator is positioned in the shell and is in contact with the metal lamp holder, the inner surface of the radiator is provided with a plurality of radiating fins, the radiating fins extend towards the inside of the radiator, a radiating channel is formed by the inner surface of the radiator and the outer surfaces of the radiating fins, the radiating channel and the air vent form a convection channel, and the inner surface of the radiator and/or the surfaces of the radiating fins are/is provided with an aluminum oxide coating; the lamp plate, the lamp plate includes base plate and LED light source, the lamp plate is attached in on the surface of radiator. The LED bulb lamp formed in the way is uniform in luminous illuminance, high in luminous flux utilization rate and remarkably improved in heat dissipation effect.

Description

LED bulb lamp

Technical Field

The invention relates to an LED bulb lamp.

Background

The LED bulb lamp has the advantages of long service life, small size, energy conservation and power conservation, and is widely applied to indoor illumination, office illumination, public illumination and decorative illumination. The LED light source has large heat productivity, the performance and the service life of the light source have direct relation with the temperature, and the higher the temperature is, the worse the performance is, and the shorter the service life is. Due to the fact that the LED bulb lamp is small in size, heat of the LED bulb lamp is difficult to dissipate. Therefore, the heat dissipation problem of the LED lamp is one of several core problems that people in the industry pay attention to, and if the problem is not well handled, light decay is generated when the problem is light, and the problem is that the lamp is rapidly stopped when the problem is heavy, so that the service life of the lamp is greatly shortened. In order to solve the problem of heat dissipation, a light source radiator is generally made into a metal piece with good heat conduction, the size of the metal piece is large, the metal piece is arranged outside a bulb shell and exposed in the air, heat is conducted to the outside of the radiator, and then the heat is dissipated by external radiation and external convection. However, because the metal radiator is exposed, people can easily contact the metal piece due to the heat dissipation problem, the metal piece is a conductor, electric shock accidents are easily caused, and meanwhile, the metal piece is difficult to pass a high-voltage test, so that the power supply needs to be made into an isolated power supply, the cost is high, and the requirements on the safety and the consistency of the power supply are strict.

At present, the radiating shell is made of plastic-coated aluminum in the market, so that electric shock safety accidents caused by contacting with a metal piece can be avoided. However, the plastic in the plastic-coated aluminum has poor heat-conducting property, so that heat is difficult to be conducted to the outer surface of the plastic from the internal aluminum alloy part, and the heat is difficult to be radiated. For the LED bulb lamp with high lumen and larger calorific value, the temperature of the LED light source is difficult to reduce.

In addition, the shell of the product is made into an insulator, the area of the LED substrate is increased, and the LED substrate not only conducts electricity for the LED light source, but also plays a role in conducting heat. An article of 'Chinese LED on-line' of a WeChat public medium discloses an LED bulb lamp (as shown in figures 1 and 2), wherein a shell of the LED bulb lamp is made of a plastic insulating material, holes are formed in the top and the bottom of the shell, two LED substrates in the LED bulb lamp are large in area and are vertically and crossly arranged, and an LED driving power supply is integrally located at the bottom of one LED substrate. The shell is isolated, the heat of the LED is conducted to the substrate, and the heat is dissipated through a convection channel formed by the shell and the substrate. Because the substrate is vertically arranged, the LED light source emits light towards the outer circumference, and the purpose of emitting light at a large angle is achieved. In order to solve the problem of heat dissipation, the substrate of the LED bulb is inevitably large, and the substrate is too large, so that the distance between the substrate and the inside of the shell is small, and even the substrate is contacted with the inside of the shell, and the generated lighting effect is greatly different from that of an incandescent lamp. After the LED bulb lamp is ignited, the generated visual effect has several sections of dark spots, meanwhile, a larger part of light rays emitted by the LED light source are not directly irradiated to the inner wall of the shell, but irradiated to the substrate and then reflected to the inner wall of the shell, and thus, partial luminous flux is lost. In addition, because the substrate is used as a heat radiator, the area of the substrate is increased, the cost is increased, meanwhile, the formed convection channel is equivalent to the whole space inside the shell, and the increase effect of the air movement speed of internal convection is not obvious because the space is too large. In addition, because there is not metal radiator inside, rely on the base plate to conduct heat purely, the upper and lower convection current of rethread shell trompil distributes away, because the heat conductivility of base plate is not high, needs the area increase of shell convection current hole, and upper portion trompil area need reach 634 square millimeters, and lower part trompil area need reach 1500 square millimeters, has the danger that the people easily contacted inside ball bubble lamp electrified position.

Disclosure of Invention

Therefore, the present invention is to overcome the above-mentioned defects in the prior art, and provide a novel LED bulb lamp with good heat dissipation and better safety.

The invention provides an LED bulb lamp, which comprises:

a housing comprising a vent;

the driving power supply is positioned at the bottom of the shell;

the metal lamp holder is electrically connected with the driving power supply through a lead;

the radiator is positioned in the shell and is in contact with the metal lamp holder, the inner surface of the radiator is provided with a plurality of radiating fins, the radiating fins extend towards the inside of the radiator, a radiating channel is formed by the inner surface of the radiator and the outer surfaces of the radiating fins, the radiating channel and the air vent form a convection channel, and the inner surface of the radiator and/or the radiating fins are/is provided with an aluminum oxide coating; the formed internal convection channel is similar to a chimney effect, and the air movement speed is accelerated during convection of air, so that the convection is enhanced, and heat is quickly dissipated; the alumina coating can make the radiator have good heat conduction performance and excellent heat radiation effect.

The lamp plate, the lamp plate includes base plate and LED light source, the lamp plate is attached in on the surface of radiator.

The air holes of the shell comprise top air holes, and heat generated by the LED light source is convectively dissipated through the top air holes via the heat dissipation channel. Further preferably, the housing further includes a bottom vent hole, and external air flows through the bottom vent hole and the top vent hole via the heat dissipation channel. According to the LED bulb lamp provided by the invention, in order to further improve the heat dissipation effect, preferably, the shell can further be provided with a top sparse channel which extends towards the inside of the shell around the top ventilation hole. Thus, a convection channel which runs through the bottom air holes of the shell, the internal heat dissipation channel of the radiator, the top sparse channel of the shell and the top air holes of the shell can be formed from bottom to top. The beneficial effects produced by the method are as follows: air enters from the air holes in the bottom or the top of the shell, dredges the channel through the inner channel of the radiator and the top of the shell, and then comes out from the air holes in the bottom or the top of the shell, and the formed inner convection channel is similar to a chimney effect, accelerates the movement speed of air during convection, plays a role in enhancing convection and enables heat to be quickly dissipated.

Further, the radiator comprises an upper part and a lower part, the height ratio of the upper part to the lower part in the vertical direction can be 1: 1-5: 1, the outer surface of the upper part of the radiator is a truncated pyramid-shaped surface, and the outer surface of the lower part of the radiator is a cylindrical surface.

Further, the thickness of the lower pipe wall of the radiator is larger than that of the upper pipe wall of the radiator. The radiator can be better attached to the lamp housing, and the radiating effect is ensured.

Furthermore, the outer surface of the upper portion is a plurality of planes, and the planes and the vertical direction form included angles of 0-90 degrees. Install a plurality of LED lamp plates in the surface on radiator upper portion after, the luminous light of the LED light source on a plurality of LED lamp plates can be launched towards circumference all directions, simultaneously because a plurality of planes on radiator upper portion are the contained angle with vertical direction, has adjusted the luminous light of LED light source towards the angle of vertical direction transmission, and illuminance evenly distributed can not appear the bright inhomogeneous state of transition of illuminance. When the included angles between the planes on the upper part of the radiator and the vertical direction are 0 degree, the LED light source emits light rays in the direction perpendicular to the vertical direction, and the illumination can be uniformly distributed.

Furthermore, the planes and the vertical direction form included angles of 10-30 degrees.

Further, the distance between the top of the radiator and the inside of the shell is 5-30 mm. So as to avoid discomfort caused by the granular LED light source being seen by human eyes. More preferably 18 to 22 mm. Preferably, the LED substrate is mounted on an outer surface of an upper portion of the heat sink, i.e., a planar portion of the truncated pyramid. The beneficial effects of this embodiment are: the lighting effect who produces is similar to the incandescent lamp, after lighting LED ball bubble lamp, can not produce the defect that visual effect has several sections dark spots, and the light that the LED light source came out simultaneously directly shines to the shell inner wall, can not shine on the radiator earlier and reflect to the shell inner wall again to can not lose partial luminous flux.

Furthermore, the lamp panel and the outer surface of the radiator are plated with graphene. Plating a layer of graphene on the outer surfaces of the lamp panel and the radiator can help the LED lamp panel to dissipate heat. In a preferred embodiment, the material of the heat sink is aluminum and has an aluminum oxide coating on its surface.

Further, the shell comprises two parts which are symmetrical along a longitudinal axis, and the two parts are combined to assemble the shell. The main material of the shell is plastic.

Further, the inner surface of the heat sink is provided with a plurality of radiating fins which extend towards the inside of the heat sink; the radiator is provided with a central axis, the distance between a point on the central axis and the edge of the radiating fin is r, and the range of r is more than or equal to 0mm and less than 15 mm. The number of the heat dissipation fins may be 2 to 50, preferably 3 to 30, and more preferably 6 to 20. Preferably, the radiator fins extend in a direction parallel to an axis of the heat sink so as not to interfere with air flow in the convection passage. The beneficial effects of this embodiment are: because the LED lamp panel is arranged on the outer surface of the radiator, and heat generated by the LED light source is conducted to the radiator, the heat of the LED bulb lamp is mainly dissipated by internal convection, and the plurality of fins in the radiator increase the internal heat dissipation area, so that the heat can be dissipated by the internal convection of the radiator more easily.

Further, the range of r is 2-12 mm.

Furthermore, the radial thickness of the radiating fins in the LED bulb lamp can be 0.5-1.5 mm.

Furthermore, the length of the radiating fins in the axial direction of the LED bulb lamp can be 1-10 mm. More preferably 3 to 7 mm. The invention has the beneficial effects that: compared with the prior art, the invention comprises any one or any combination of the following effects:

1) a chimney-like convection channel is formed inside the bulb lamp to enhance heat dissipation;

2) the aluminum oxide coating can enable the radiator to have good heat conduction performance and excellent heat radiation effect;

3) the lighting effect who produces is similar to the incandescent lamp, after lighting on LED ball bubble lamp, avoids the human eye to see graininess LED light source and feels uncomfortable, and the light that the LED light source came out directly shines to the shell inner wall simultaneously, can not shine on the radiator earlier and reflect to the shell inner wall to can not lose partial luminous flux.

4) The technical scheme of 'light and heat path separation' is creatively applied: the inside of the radiator is used for dissipating heat, the lamp panel is arranged outside the radiator and used for emitting light, and the light emitting and the heat dissipation are completed in different areas of the bulb lamp.

5) The photoelectric conversion efficiency of the lamp is improved, and the energy-saving effect is achieved.

Drawings

Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic perspective view of a known bulb lamp;

FIG. 2 is a schematic diagram of the internal perspective of the bulb lamp shown in FIG. 1;

FIG. 3 is a schematic front view of the LED bulb of the present invention;

FIG. 4 is a schematic cross-sectional perspective view of an LED bulb of the present invention;

FIG. 5 is an exploded explanatory view of the LED bulb of the present invention;

FIG. 6 is a schematic structural diagram of a heat sink of the LED bulb lamp of the present invention;

FIG. 7 is a schematic perspective view of the housing of the LED bulb of the present invention;

FIG. 8 is a cross-sectional view taken along plane A-A of FIG. 3;

FIG. 9 is a cross-sectional view taken along plane B-B of FIG. 3;

FIG. 10 is a schematic structural diagram of the first embodiment when the included angle b in FIG. 6 is 0 degrees;

FIG. 11 is a schematic view of the reflector cup of the first embodiment of FIG. 10;

FIG. 12 is a schematic structural diagram of the second embodiment when the included angle b in FIG. 6 is 0 degrees;

FIG. 13 is a schematic view of the reflector cup of the second embodiment of FIG. 12;

fig. 14 is an exemplary illustration of an embodiment in which the distance from the central axis of the heat sink 1 to the edge of the radiator fin is equal to zero;

FIG. 15 is an exemplary illustration of an embodiment in which the edges of the plurality of cooling fins are all equidistant from the intersection of the heat sink along plane B-B of FIG. 3;

fig. 16 is an exemplary illustration of an embodiment in which the distance from the edge of at least one of the plurality of radiator fins to the intersection of the heat sink 1 is not equal to the distance from the edge of the other radiator fins to the intersection, along plane B-B in fig. 3;

fig. 17 is an exemplary illustration of an embodiment in which the edges of the plurality of cooling fins are all unequal distance from the intersection of the heat sink along plane B-B of fig. 3;

fig. 18 is an exemplary illustration of an embodiment in which the plurality of virtual circles and the edges of the plurality of radiator fins are staggered along plane B-B in fig. 3.

Detailed Description

The present invention is described in further detail below with reference to specific embodiments, which are given for the purpose of illustration only and are not intended to limit the scope of the invention.

Examples

The embodiment is used for explaining the LED bulb lamp provided by the invention.

As shown in fig. 3 to 5, the LED bulb lamp of the present invention includes: radiator 1, drive power supply 2, shell 3, metal lamp holder 4 and a plurality of lamp plate 5, radiator 1 is located inside shell 3 and contacts with metal lamp holder 4. Wherein the heat sink 1 has a heat sink inner surface 101 and a heat sink outer surface 102, a heat dissipation channel being enclosed by the heat sink inner surface 101. The housing 3 is composed of a left half 301 and a right half 302, which are combined to assemble the housing 3. The housing 3 has a bottom vent 303 and a top vent 304. Each lamp panel 5 is composed of a substrate 501 and an LED light source 502, and is mounted or attached on the outer surface 102 of the heat sink. The driving power supply 2 is inserted into the bottom of the shell 3 and is electrically connected with the metal lamp cap 4 through an input lead. The output wire of driving power supply 2 can be by the inside top of radiator 1 around going out, perhaps lamp plate 5 and radiator 1 can open the through hole that supplies the output wire to run through, and the output wire passes corresponding through hole again and forms electrical connection with lamp plate 5, can adopt series connection or parallelly connected mode electrical connection between a plurality of lamp plates 5. In this way, the current is conducted to the input wire of the driving power supply 2 through the metal lamp holder 4, and then conducted to the lamp panel 5 after being transformed by the driving power supply 2, so that the LED light source 502 on the lamp panel 5 is lighted to emit light.

Further, in the LED bulb lamp of the present invention, the bottom vent 303 of the outer casing 3, the heat dissipation channel surrounded by the inner surface 101 of the heat sink, the top sparse channel 7 in the outer casing, and the top vent 304 of the outer casing 3 form a convection channel. Wherein, as shown by the arrow direction in fig. 4, the external air flows in from the bottom vent 303, flows through the heat dissipation channel, and is then emitted from the top vent 304. The lower part 104 of the heat sink 1 is a cylinder, and the upper part 103 of the heat sink 1 is a truncated pyramid. In the LED bulb lamp shown in fig. 4 and 5, the upper part 103 of the heat sink 1 is a truncated pentagonal pyramid, i.e., the cross section of the upper part 103 of the heat sink 1 is pentagonal. The height ratio of the upper part 103 and the lower part 104 of the radiator 1 in the vertical direction can be 1-5: 1, and preferably 1.5-2.5: 1. In the LED bulb lamp shown in fig. 4 and 5, the height ratio of the upper part 103 and the lower part 104 of the heat sink 1 in the vertical direction is 2: 1. The lower portion of the heat dissipation channel inside the heat sink 1 may be a uniform cylindrical channel. The upper part of the heat dissipation channel inside the heat sink 1 may be a channel structure with a wide bottom and a narrow top, so as to enhance the effect of the chimney effect and help to push the air inside the heat sink 1 to flow. In the present embodiment, the shape of the heat radiation passage inside the heat sink 1 is the same as the shape of the outside of the heat sink 1. In another embodiment, the upper and lower portions of the heat dissipation channel inside the heat sink 1 may be uniform cylindrical channels, that is, the shape of the heat dissipation channel inside the heat sink 1 is different from the shape of the exterior of the heat sink 1, and the wall of the heat sink 1 may have different thicknesses, for example, the wall thickness of the lower portion of the heat sink 1 is greater than the wall thickness of the upper portion of the heat sink 1.

The top channel 7 in the housing is preferably made of a transparent material to prevent shielding light emitted from the LED light source, and the material may be PC plastic or an optical substrate with good transmittance, preferably the same material as the lamp housing. The fixing mode of the top sparse channel 7 and the heat sink 1 in the housing can be adhesion, clamping or locking. The size of the channel fixedly connected with the heat sink 1 and the top sparse channel 7 in the housing can be larger than, smaller than or equal to the size of the heat dissipation channel, that is, the part of the heat dissipation channel fixedly connected with the top sparse channel 7 in the housing can be completely accommodated in the top sparse channel 7 in the housing, or the part of the top sparse channel 7 in the housing fixedly connected with the heat dissipation channel can be completely accommodated in the heat dissipation channel, the relative channel sizes and fixing modes of the top sparse channel 7 in the housing and the heat dissipation channel only need to enable the top sparse channel 7 in the housing and the heat sink 1 to be fixedly connected with each other and not to fall, and the external air flow flows into the bottom vent holes 303, flows through the heat dissipation channel and the top sparse channel 7 in the housing, and then is emitted from the top vent holes 304, which is the protection scope of the present.

Further, referring to fig. 7, in the LED bulb lamp of the present invention, the opening area of the top vent 304 of the housing 3 may be 100 to 500 square millimeters, preferably 150 to 450 square millimeters; the opening area of the bottom vent 303 of the housing 3 may be 200 to 1200 square millimeters, preferably 450 to 1000 square millimeters. Compared with the LED bulb lamp shown in the figures 1-2, the air holes are small in area, and the danger that people contact the charged parts inside the bulb lamp can be avoided.

Further, referring to fig. 4, the heat sink 1 may be made of metal or plastic with high thermal conductivity, and the heat sink inner surface 101 may preferably have a plurality of fins 105. Because the LED lamp panel 5 is attached to the outer surface 102 of the heat sink, the heat generated by the LED light source 502 is conducted to the heat sink 1, and the heat of the LED bulb is mainly dissipated by internal convection, the heat dissipation fins 105 inside the heat sink 1 increase the internal heat dissipation area, thereby facilitating the heat dissipation through the heat sink inner surface 101 by radiation and convection.

Further, referring to fig. 4-6, the LED lamp panel 5 is mounted on the outer surface of the upper portion 103 of the heat sink 1, and the outer surface of the upper portion 103 of the heat sink 1 is a plurality of planes uniformly distributed on the circumference (i.e., the cross section of the upper portion 103 of the heat sink 1 is in the shape of a truncated pyramid), and forms an included angle with the vertical direction. The lower part 104 of the heat sink 1 is preferably a vertical cylinder. In cross section, the outer surface of the upper part 103 of the heat sink 1 forms an angle b with the outer surface of the lower part 104 of the heat sink 1, and the angle b may be 0-90 degrees, preferably 10-30 degrees, and most preferably 15 degrees. When the included angle b is 0 degree, the LED light source 502 emits light perpendicular to the vertical direction, so that the illuminance is uniformly distributed. When the included angle b is gradually increased, the illumination intensity of the upward light emitted by the LED light source 502 can be increased.

In another embodiment, when the included angle is 90 degrees, the LED light source 502 emits light vertically upward, and it is difficult to adjust the uniformity of the illuminance, and at this time, two embodiments of light distribution with matching reflective cups may be used, but not limited to these embodiments. Referring to fig. 10-11, a first embodiment of the light distribution of the reflector 6 is shown. The included angle b is 90 degrees, the LED light source 502 emits light vertically upwards, the light-reflecting cup 6 needs to be installed for light distribution adjustment, the light-reflecting cup 6 is installed on the radiator 1 through a screw, and a light-reflecting surface is arranged on the outer side of the light-reflecting cup and used for reflecting the light generated by the LED light source 502 to the side direction, so that the light-emitting brightness distribution of the LED bulb lamp is larger than 180 degrees. Referring to fig. 12-13, in order to avoid the risk of electric shock for a person, in a second light distribution embodiment of the reflector 6, the bottom of the reflector 6 has a plurality of holes, the size of each hole is about equal to or slightly larger than that of the LED light source 502, and the depth of each hole is also equal to or slightly larger than that of the LED light source 502. And the reflecting cup 6 is provided with a buckling position, and when the reflecting cup 6 is installed, the buckling position of the reflecting cup 6 penetrates through the hole position of the LED lamp panel 501 and the hole position of the radiator 1 and is clamped into the radiator 1, so that the reflecting cup is fixed with the radiator 1.

Further, referring to fig. 8, fig. 8 is a sectional view taken along the plane a-a in fig. 3, wherein the plane a-a is where the cross-sectional diameter of the LED bulb lamp of the present invention is largest. The radiator 1 is arranged in the shell 3, the LED lamp panel 5 is arranged on the outer surface of the upper portion 103 of the radiator 1, and the height of the outer surface of the upper portion 103 of the radiator 1 is not more than that of an LED light source light-emitting surface, so that the LED light source is prevented from being shielded. Wherein, a certain distance is arranged between the outer surface of the upper part 103 of the heat sink 1 and the inner part of the shell, preferably 5-30mm, more preferably 18-22 mm, so as to avoid discomfort caused by that the granular LED light source is seen by human eyes.

Because the surface of the LED lamp panel 5 is provided with the dielectric layer which is not easy to dissipate heat to make circuit insulation protection, the surface of the LED lamp panel 5 and the surface of the radiator 1 can be coated with a layer of light-permeable graphene, so that heat generated by the LED light source on the surface of the LED lamp panel 5 can be rapidly conducted to the surface of the radiator 1 to be rapidly evacuated. Graphene is a planar thin film consisting of carbon atoms, is a two-dimensional material with the thickness of only one carbon atom, is the thinnest and the hardest nano material in the world at present, is almost completely transparent, only absorbs 2.3 percent of light, has the thermal conductivity coefficient as high as 5300W/m.K, and is very suitable for helping a light-emitting component to dissipate heat.

Regarding the bulb lamp with general brightness requirement more than 800lm, the LED light source 502 on the LED lamp panel 5 can be arranged in a plurality of 28 × 35 small power LED lamp beads, and the distance between the lamp beads should be set to 5-10 mm due to heat dissipation, so that the visual effect of human eyes does not generate granular light source feeling. In addition, 2 LED lamp beads with medium power of 30 multiplied by 30W can be arranged on the same LED lamp panel 5, and the distance between the lamp beads is adjusted to be more than 10mm in consideration of the problem of heat dissipation. In one embodiment, 6 pieces of the above LED lamp panels are arranged on the outer surface of the upper portion 103 of the heat sink 1 according to the above manner, are uniformly distributed on the periphery of the hexahedron, and form an included angle of 15 degrees with the vertical direction. Theoretically, the overall luminous flux of the LED light source 502 may exceed 1000lm, but is affected by the heat dissipation obstruction and the light absorption effect of the assembly, and the expression value of the luminous flux is lower, but the data obtained by the whole bulb lamp actually can still reach over 800 lm.

Further, referring to fig. 9, a cross-sectional view taken along a plane B-B in fig. 3, wherein the plane B-B is a cross-section at the bottom of the heat sink 1. The heat sink 1 preferably has a plurality of heat dissipation fins 105 inside to increase the internal heat dissipation area, and to facilitate the heat dissipation by radiation and convection inside the heat sink 1. For example, the number of the heat dissipation fins 105 may be 2 to 50, preferably 3 to 30, and more preferably 6 to 20.

Referring to fig. 3 and 4 again, the LED bulb lamp of the present invention includes: the LED lamp comprises a shell 3, a radiator 1, a lamp panel 5, a driving power supply 2 and a metal lamp cap 4, wherein the lamp panel 5 comprises a substrate 501 and an LED light source 502, and the shell 3 is provided with air holes; the inner surface of the heat sink 1 is provided with heat dissipation fins 105 extending towards the inside of the heat sink 1, a heat dissipation channel is formed by the inner surface of the heat sink 1 and the outer surfaces of the heat dissipation fins 105, and the heat dissipation channel and the air vents form a convection channel. The radiator 1 is provided with a central axis XX, a plane B-B taking the central axis XX as a normal line intersects with the central axis XX at an intersection point 91, and the intersection point 91 is positioned in the radiating channel. In one embodiment, there is at least one point on the central axis XX that is at a distance equal to zero from the edge of the heat sink fin 105, as shown in fig. 14 for an exemplary illustration.

In other embodiments, the distance of the central axis XX from the edge of the heat sink fin 105 along the plane B-B is greater than zero, as shown in fig. 15-18. In the example of fig. 15, a virtual circle (shown as a dotted line in fig. 15) is established on the plane B-B by taking the intersection point 91 as a center and the distance D1 as a radius, and the heat sink 1 has at least one heat dissipation fin 105, and the virtual circle is staggered with the edge of the heat dissipation fin 105. When the heat sink 1 has a plurality of heat dissipation fins 105, the edges of the plurality of heat dissipation fins 105 have the same distance D1 from the central axis of the heat sink 1, and the virtual circle and the edges of the plurality of heat dissipation fins 105 are all staggered.

In another embodiment of the present invention, the heat sink 1 has a plurality of heat dissipating fins 105, the distances D1 and D2 from the edges of at least two heat dissipating fins 105 of the plurality of heat dissipating fins 105 to the central axis XX of the heat sink 1 along the plane B-B are not equal, the distance D1 is smaller than the distance D2, the intersection point 91 is taken as the center of a circle, the shorter distance D1 is taken as a radius, a virtual circle (shown by a dashed line in fig. 16) is established on the plane B-B, and the virtual circle and the edges of the heat dissipating fins 105 with the distance D2 are not staggered, as shown in fig. 16 for an exemplary illustration of the present embodiment.

In another embodiment of the present invention, the heat sink 1 has a plurality of heat dissipating fins 105, distances D1, D2, D3, …, Dn (only D1, D2 and D3 are shown in the figure) from edges of the plurality of heat dissipating fins 105 to a central axis XX of the heat sink 1 are all different, the distance D1 is smaller than the distance D2, the distance D2 is smaller than the distance D3, a virtual circle (shown as a dotted line in fig. 17) is established on the plane B-B with the intersection 91 as a center and the shortest distance D1 as a radius, and the virtual circle is not staggered with edges of other heat dissipating fins 105 larger than the shortest distance D1, as shown in fig. 17 for an exemplary illustration of the present embodiment.

In another embodiment of the present invention, the heat sink 1 has a plurality of heat dissipating fins 105, distances D1, D2 and D3 from edges of the plurality of heat dissipating fins 105 to a central axis XX of the heat sink 1 are not equal, the distance D1 is smaller than the distance D2, the distance D2 is smaller than the distance D3, a plurality of virtual circles (shown as a dotted line in fig. 18) are established on the plane B-B with the intersection point 91 as a center and the distances D1, D2 and D3 as radii, the edges of the partial virtual circles and the edges of the partial heat dissipating fins 105 are not staggered, the partial virtual circles penetrate the partial heat dissipating fins 105, fig. 17 is an exemplary illustration of the present embodiment, the virtual circles established on the plane B-B with the distance D1 as a radius, and the heat dissipating fins 105 with the distance greater than D1 are not staggered; a virtual circle established on the plane B-B by taking the distance D2 as a radius penetrates the heat dissipation fins 105 with the distance smaller than D2 and does not intersect the heat dissipation fins 105 with the distance larger than D2; the imaginary circle created on the plane B-B with the distance D3 as the radius penetrates the heat sink fins 105 with a distance greater than D3.

Further, referring to fig. 4 and 6, the shape of the heat sink 1 is approximately similar to a hollow cylinder, the heat dissipation channel may be a channel structure with a wide bottom and a narrow top, the aspect ratio of the whole heat sink 1 structure is greater than 2.5, and the chimney effect is more obvious, preferably 2.5-10. According to the most common standards of bulb lamps A19, A20 and A67 in the market, the overall height H of the radiator 1 can be 40-80 mm. Such a structure with a wide lower part and a narrow upper part can enhance the effect of the chimney effect and help to promote the air flow inside the radiator 1. The top end of the radiator 1 is connected with the top sparse channel 7 of the shell, when hot air in the radiator 1 is collected to the top end, the hot air can be transmitted to the top air hole 304 of the shell through the top sparse channel 7 in the shell, and then is discharged out of the shell, so that the purpose of heat dissipation is achieved. The above-described dimensions of the heat sink 1 are merely one way of implementing the present invention, and are not intended to limit the scope of the claims.

Referring to fig. 8 and 9, in the present embodiment, the inner diameter R of the bottom of the heat sink 1 may be 10-15 mm, that is, the distance from the central axis XX of the heat sink 1 to the inner surface of the heat sink 1 may be 10-15 mm. Since 12 heat dissipation fins 105 are disposed inside the heat sink 1 and staggered, the 12 heat dissipation fins 105 are only shown as an example, in other embodiments, different numbers of heat dissipation fins 105 may be used, please refer to fig. 8 and fig. 9 together (fig. 8 is a cross-sectional view along the plane a-a in fig. 3, and fig. 9 is a cross-sectional view along the plane B-B in fig. 3), the inner diameter r taking the edge of the heat dissipation fin 105 as the circumference may range from 0 to 15mm, i.e., the distance from the edge of the heat dissipation fin 105 to the central axis of the heat sink 1 is greater than or equal to 0 to less than 15mm, as shown in the virtual circle radius in fig. 14 to 18. For the heat sink 1 with the bottom inner diameter R of 15mm, when R is 0, the heat dissipation fins 105 will be collected on the central axis XX, and when R is equal to 15mm, no heat dissipation fins 105 are in the heat dissipation channel. The size of r is preferably larger than zero, and more preferably 2-12 mm. One beneficial effect of said r being greater than zero is to facilitate demoulding during manufacturing of the heat sink 1. The length of the heat dissipation fins 105 and the height of the heat sink 1 form a cylindrical space, which is a space inside the heat sink 1 for heat to be dissipated by radiation and convection. In a preferred embodiment as shown in fig. 3-9, the inner diameter R of the heat sink 1 may taper from 15mm to 10mm from the bottom to the top of the heat sink 1. The inner diameters r defined by the heat sink fins 105 may be the same or different from the bottom to the top of the heat sink 1. That is, the length (i.e., R-R) of each fin 105 extending toward the central axis XX of the heat sink 1 may be constant along the height direction of the heat sink 1 or may vary along the height direction of the heat sink 1. For example, in the preferred embodiment shown in fig. 8 and 9, the inner diameter R defined by the heat sink fins 105 decreases as the inner diameter R of the heat sink 1 decreases from plane B-B to plane a-a, respectively. The lengths of the respective heat dissipation fins 105 extending along the inner surface of the heat sink 1 may be the same or different, that is, the lengths of the respective heat dissipation fins 105 may be equal or different. Each of the heat dissipation fins 105 may extend along the inner surface of the heat sink 1 in a direction parallel to the central axis of the heat sink 1, or may extend along the inner surface of the heat sink 1 in a spiral shape.

Comparative example 1

Fig. 1 and 2 show a known LED bulb. The lamp housing 23 of the LED bulb lamp is made of plastic insulating material, and the lamp housing 23 has a plurality of lower convection holes 2303 and a plurality of upper convection holes 2304. The LED bulb lamp is internally provided with two heat dissipation substrates 2501 (with the area of about 1150 mm) which are vertically and crossly arranged and have larger areas²). The heat of the internal LED is conducted to the heat dissipation substrate 2501, and then is dissipated through the convection channel formed by the lamp housing 23 and the heat dissipation substrate 2501, because the heat dissipation substrate 2501 is vertically installed, the LED light source 2502 emits light towards the outer circumference, and the purpose of emitting light at a large angle is achieved.

However, in order to solve the problem of heat dissipation, the area of the heat dissipation substrate 2501 must be made large, and the heat dissipation substrate 2501 is too large, so that the distance between the heat dissipation substrate 2501 and the inside of the lamp housing 23 is small, or even the heat dissipation substrate 2501 is in contact with the inside of the lamp housing 23, so that the difference between the generated lighting effect and the incandescent lamp is large, after the LED bulb is ignited, the defect that the visual effect has several dark spots can be generated, meanwhile, a large part of light from the LED light source is not directly irradiated to the inner wall of the lamp housing, but irradiated to the heat dissipation substrate 2501 and then reflected to.

In addition, because the substrate is used as a heat radiator, the area is large, the cost is increased, meanwhile, the formed convection channel is equivalent to the whole space inside the shell, and the effect of increasing the air movement speed of internal convection is not obvious because the space is too large. Meanwhile, because there is no separate metal heat sink inside, heat is conducted simply by the heat dissipation substrate 2501, and then is dissipated by up-and-down convection through the lamp housing opening, because the heat conduction capability of the substrate is not high, the area of the convection hole of the lamp housing 23 needs to be increased, the opening area of the upper convection hole 2304 reaches 634 square millimeters, the opening area of the lower convection hole 2303 reaches 1500 square millimeters, and the total opening area is 2134 square millimeters. The area of the convection hole is increased, and the danger that people can easily contact the charged part of the internal bulb lamp exists.

Claims

1. An LED bulb lamp, characterized in that, the LED bulb lamp includes:

a housing comprising a vent;

the driving power supply is positioned at the bottom of the shell;

the heat radiator is wrapped by the shell, so that the heat radiator is positioned in the shell and is in contact with the metal lamp holder, the inner surface of the heat radiator is provided with a plurality of heat radiating fins, the heat radiating fins extend towards the inside of the heat radiator, a heat radiating channel is formed by the inner surface of the heat radiator and the outer surfaces of the heat radiating fins, the heat radiating channel and the air vent form a convection channel, and the inner surface of the heat radiator and/or the surfaces of the heat radiating fins are/is provided with an aluminum oxide coating;

the LED lamp comprises a lamp panel, the lamp panel comprises a substrate and an LED light source, the lamp panel is attached to the outer surface of the radiator, the radiator comprises an upper portion and a lower portion, the height ratio of the upper portion to the lower portion in the vertical direction is 1: 1-5: 1, the outer surface of the upper portion of the radiator is a truncated pyramid-shaped surface, and the outer surface of the lower portion of the radiator is a cylinder-shaped surface.

2. The LED bulb lamp of claim 1, wherein a lower wall thickness of the heat sink is greater than an upper wall thickness of the heat sink.

3. The LED bulb lamp according to claim 1, wherein the outer surface of the upper portion is a plurality of planes, and the plurality of planes form an included angle of 0-90 degrees with the vertical direction.

4. The LED bulb lamp according to claim 3, wherein the plurality of planes form an included angle of 10-30 degrees with the vertical direction.

5. The LED bulb lamp according to claim 1, wherein a distance between the top of the heat sink and the inside of the housing is 5-30 mm.

6. The LED bulb lamp according to claim 1, wherein the lamp panel and the heat sink are coated with graphene on the outer surface.

7. The LED bulb lamp according to claim 1, wherein the housing comprises two parts symmetrical about a longitudinal axis, and the two parts are combined to assemble the housing.

8. The LED bulb lamp as claimed in claim 1, wherein the heat sink has a central axis, a distance r from a point on the central axis to the edges of the heat dissipating fins, and the range of r is 0mm ≦ r < 15 mm.

9. The LED bulb lamp according to claim 8, wherein r is in a range of 2-12 mm.

10. The LED bulb lamp according to claim 1, wherein the thickness of the heat dissipation fins in the radial direction of the LED bulb lamp is 0.5-1.5 mm.

11. The LED bulb lamp according to claim 1, wherein the length of the heat dissipation fins in the axial direction of the LED bulb lamp is 1-10 mm.