CN219775495U

CN219775495U - LED lighting equipment

Info

Publication number: CN219775495U
Application number: CN202221589956.6U
Authority: CN
Inventors: 王名斌; 陆健; 王广东
Original assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Current assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Priority date: 2021-03-18
Filing date: 2022-01-24
Publication date: 2023-09-29
Anticipated expiration: 2032-01-24
Also published as: CN217584104U

Abstract

The present utility model provides an LED lighting device comprising: a lamp base; a light emitting unit; the light-emitting unit is electrically connected with the power supply; the heat exchange unit comprises a plurality of fins, and the light-emitting unit is fixed on the heat exchange unit; and a second convection channel which convectively dissipates heat from the fins; the light-emitting unit comprises a first light source and a second light source, when the lamp cap is installed along the vertical direction, the first light source at least provides lateral light emission, and the second light source provides downward light emission; the fins form a containing space on the inner side of the radial direction of the LED lighting equipment, and at least 80% of the fins in the length direction of the power supply are positioned in the containing space; the power supply and the fins are separated by an isolation unit, the isolation unit comprises an isolation tube, the inside of the isolation tube is filled with a heat conducting material so as to cover the power supply, and the power supply and the isolation tube form a heat conducting path through the heat conducting material.

Description

LED lighting equipment

The utility model is a divisional application of 2022, 1 month and 24 days, filed with China patent office, application number 202220182213.0 and novel name of 'an LED lighting device'.

Technical Field

The utility model belongs to the technical field of LED lighting devices, and particularly relates to LED lighting equipment.

Background

LED lighting is widely used because of its energy saving, long life, etc. LED lighting devices in the prior art, commonly include flat panel lamps and grille lamps.

LED lighting devices (e.g., LED corn lamps) of the prior art include a heat sink, a lamp housing, a light source, a power source, and a lamp head. The lamp housing is connected with the lamp cap, the power supply is arranged in the lamp housing, the radiator is connected with the lamp housing, and the light source is fixed on the radiator. Such LED lighting devices in the prior art have the following drawbacks: the lamp housing occupies the length space of the whole lamp, so that the luminous area of the whole lamp occupies less space in the length direction, and the light emitting effect is affected; corn lamps generally use fans for heat dissipation, which is costly and the life of the fan may affect the life of the entire lamp

In view of the above, how to design the LED lighting device to solve the heat dissipation problem is a technical problem to be solved by those skilled in the art in view of the defects and drawbacks of the LED lighting device in the prior art.

Disclosure of Invention

The abstract herein describes many embodiments of the utility model. The terminology is used to describe only some of the embodiments disclosed in this specification (whether or not in the claims), and is not a complete description of all possible embodiments. Certain embodiments described above as various features or aspects of the utility model may be combined in different ways to form an LED lighting device or a portion thereof.

Embodiments of the present utility model provide a new LED lighting device, and features of various aspects, to solve the above-mentioned problems.

An embodiment of the present utility model provides an LED lighting apparatus, which is characterized by comprising:

a lamp base;

a light emitting unit;

the light-emitting unit is electrically connected with the power supply;

the heat exchange unit comprises a plurality of fins, the light-emitting unit is fixed on the heat exchange unit, and the heat exchange unit is connected to the lamp cap; and

a second convection channel which convectively dissipates heat from the fins;

the light-emitting unit comprises a first light source and a second light source, when the lamp cap is installed along the vertical direction, the first light source at least provides lateral light emission, and the second light source provides downward light emission;

the fins form a containing space on the inner side of the radial direction of the LED lighting equipment, and at least 80% of the fins in the length direction of the power supply are positioned in the containing space;

the power supply and the fins are separated by an isolation unit, the isolation unit comprises an isolation tube, the inside of the isolation tube is filled with a heat conducting material so as to cover the power supply, and the power supply and the isolation tube form a heat conducting path through the heat conducting material.

The power supply provided by the embodiment of the utility model comprises an electronic element and a circuit board, wherein the electronic element is fixed on the circuit board, the length of the circuit board accounts for more than 70% of the length of the heat exchange unit, and the circuit board is completely positioned in a space defined by the heat exchange unit.

The length of the second convection channel in the axial direction of the LED lighting device in the embodiment of the utility model is more than 50%, 55%, 60%, 65% or 70% of the total length of the LED lighting device.

In the embodiment of the utility model, the second convection channel forms a third opening at one end between the fins, and the second convection channel forms a fourth opening at the other end between the fins.

The embodiment of the utility model also comprises an optical unit, wherein the light-emitting unit comprises a first lamp panel, the first light source is arranged on the first lamp panel, the optical unit comprises a first optical component, and one group of the first optical components corresponds to one or two columns of the first light sources.

The embodiment of the utility model further comprises an electric connection unit, wherein the electric connection unit comprises an electric connection plate, and the electric connection plate is configured to be connected with at least more than two groups of first lamp panels.

The electric connecting plate is provided with a fixing hole, and the first lamp panel penetrates through the fixing hole and is connected with the electric connecting plate.

The first lamp panel of the embodiment of the utility model is provided with a first part attached to the base of the heat exchange unit and a second part exposed outside the base, and the second part is arranged in the fixing hole.

The electric connection plate and the first lamp panel have different thermal expansion coefficients.

The area of the outer surface of the first optical member according to the embodiment of the present utility model is configured to be at least 15% or more of the area of the surface on the radially outer side of the LED lighting apparatus.

The light-emitting unit comprises a second lamp panel, the second light source is fixed on the second lamp panel, the second lamp panel is attached to the end face of one end, far away from the lamp cap, of the heat exchange unit, the optical unit comprises a second optical component, and the second optical component is covered outside the second light source.

In the embodiment of the utility model, the second lamp panel is arranged in the middle area of the end face of the heat exchange unit, and in the projection direction of the axial direction of the heat exchange unit, the second lamp panel is only overlapped with the fins.

The embodiment of the utility model further comprises a cover body, wherein the cover body is provided with a second part, the second part corresponds to the third opening, and a second air inlet hole is formed in the second part.

Compared with the prior art, the utility model has the following outstanding and beneficial technical effects: when the lamp cap is arranged in the vertical direction, the first light source can emit light to the lateral direction of the LED lighting equipment, and the second light source can emit light to the lower side of the LED lighting equipment, so that the light emitted by the LED lighting equipment is more uniform, and a dark area is prevented from being formed below the LED lighting equipment; the LED lighting equipment is provided with a second convection channel for radiating the fins, so that the radiating efficiency can be improved; the length of the second convection channel in the axial direction of the LED lighting device accounts for more than 50%, 55%, 60%, 65% or 70% of the total length of the LED lighting device, so that the second convection channel can be ensured to have a sufficient length to meet the chimney effect during convection; the length of the circuit board of the power supply accounts for more than 70% of the length of the heat exchange unit, so that the circuit board has more sizes to set the electronic elements, and larger intervals can be set between heating elements in the electronic elements.

Drawings

FIG. 1 is a schematic front view of an LED lighting device according to an embodiment of the present utility model;

FIG. 2 is a schematic top view of FIG. 1;

FIG. 3 is a schematic bottom view of FIG. 1;

FIG. 4 is a schematic cross-sectional view of an LED lighting device of an embodiment of the present utility model;

fig. 5 is an enlarged view at a in fig. 4;

fig. 6 is a schematic perspective view of an LED lighting device according to an embodiment of the present utility model;

fig. 7 is a second perspective view of an LED lighting device according to an embodiment of the present utility model;

FIG. 8 is a perspective view of an LED lighting device with a cover removed and a dust screen according to an embodiment of the present utility model;

fig. 9 is an enlarged view at B in fig. 8;

FIG. 10 is a schematic perspective view of an isolation tube;

FIG. 11 is a schematic front view of the housing;

FIG. 12 is a schematic front view of a dust screen;

FIG. 13 is a schematic perspective view of an LED lighting device in one embodiment;

FIG. 14 is a schematic cross-sectional view of FIG. 13;

fig. 15 is an enlarged view at C in fig. 14;

FIG. 16 is a schematic view of the structure of FIG. 13 with the second optical member removed;

FIG. 17 is a schematic view of the structure of FIG. 16 with the light panel and the second light source removed;

FIG. 18 is a light intensity distribution diagram of an LED lighting device in an embodiment, showing a light intensity distribution diagram of a longitudinal section of the LED lighting device (section along the axis of the LED lighting device);

FIG. 19 is a schematic perspective view of FIG. 13 with the second optical member and the first cover removed;

FIG. 20 is a schematic perspective view of the alternate orientation of FIG. 19;

fig. 21 is an enlarged view at D in fig. 19;

FIG. 22 is a schematic perspective view of an LED lighting device in some embodiments;

FIG. 23 is a schematic cross-sectional structural view of the LED lighting device of FIG. 22;

fig. 24 is an enlarged view at E in fig. 23;

FIG. 25 is a schematic perspective view of an LED lighting device in one embodiment;

FIG. 26 is a schematic diagram showing a perspective structure of an LED lighting device according to an embodiment;

FIG. 27 is an enlarged schematic view at J in FIG. 26;

FIG. 28 is a schematic diagram of a front view of an LED lighting device in one embodiment;

FIG. 29 is a schematic cross-sectional structure of an LED lighting device in an embodiment;

FIG. 30 is an enlarged schematic view at H in FIG. 29;

fig. 31 is a schematic perspective view of an LED lighting device in an embodiment with the second optical member removed.

FIG. 32 is an enlarged schematic view of FIG. 31 at I;

fig. 33 is a schematic perspective view of a heat exchange unit of the LED lighting device in an embodiment;

FIG. 34 is a schematic perspective view of an isolation tube of an LED lighting device in an embodiment;

FIG. 35 is a schematic cross-sectional structural view of an LED lighting device in an embodiment;

Detailed Description

Embodiments of the present utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the utility model are shown. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. Like reference symbols in the drawings indicate like elements.

As shown in fig. 1 to 5, an LED lighting device (without fan) is provided in an embodiment of the present utility model. The LED lighting device includes: a lamp cap 1, a lighting unit 2, a power supply 3 and a heat exchange unit 4. Wherein the lamp cap 1 is configured for connection to an external power supply unit, such as a lamp holder. The heat exchange unit 4 is directly or indirectly connected to the burner 1. The light-emitting unit 2 is electrically connected with the power supply 3, the light-emitting unit 2 is fixed on the heat exchange unit 4, the light-emitting unit 2 and the heat exchange unit 4 form a heat conduction path, and at least part of heat generated during the operation of the light-emitting unit 2 is dissipated through the heat exchange unit 4.

In this embodiment, the heat exchange unit 4 includes a base 41, and the light emitting unit 2 is disposed on a surface of the base 41. Specifically, the cross-sectional shape of the base 41 is configured as a generally annular or tubular structure having an outer surface 411. In an embodiment, the outer surface 411 of the base 41 constitutes the radially outermost side of the LED lighting device. The base 41 is further provided with a mounting surface 412, and the light emitting unit 2 is disposed on the mounting surface 412. The mounting surface 412 is located further inside the outer surface 411 in the radial direction of the LED lighting device, and after the light emitting unit 2 is mounted on the mounting surface 412, the position of the light emitting unit does not exceed the position of the outer surface 411 in the radial direction of the LED lighting device, so that the outer surface 412 plays a certain role in protecting the light emitting unit 2, and damage to the light emitting unit 2 due to collision is avoided.

In this embodiment, the light emitting unit 2 includes a first light panel 21 and a first light source 22, and the first light source 22 is disposed on the first light panel 21. The first light source 22 in this embodiment may be an LED lamp or other type of light emitting device in the prior art. The first lamp panel 21 is attached to the mounting surface 412 of the base 41, so as to facilitate the first lamp panel 21 to rapidly conduct heat to the heat exchange unit 4. Specifically, in some embodiments, the first lamp panel 21 is riveted to the heat exchange unit 4. In some embodiments, the first lamp panel 21 is connected to the heat exchange unit by bolts. In some embodiments, the first lamp panel 21 is welded to the heat exchange unit 4. In some embodiments, the first lamp panel 21 is adhered to the heat exchange unit 4, and the adhesive may be a material with high thermal conductivity. As shown in fig. 5, in some embodiments, a fixing unit (slot) is disposed on the base 41, so as to fix the first lamp panel 21, and in particular, the first lamp panel 21 is inserted into the slot (i.e. the fixing unit) for being matched. The first lamp panels 21 in the present embodiment are provided with a plurality of groups, and the plurality of groups of first lamp panels 21 are arranged along the circumferential direction of the heat exchange unit 4. That is, the outside of the heat exchange unit 4 has several sets of mounting surfaces 412 in the circumferential direction for mounting a corresponding number of sets of the first lamp panels 21. In this embodiment, the first light source 22 provides at least lateral illumination when the lamp cap 1 is mounted in a vertical direction.

The LED lighting device in the present embodiment may further include an optical unit 5, the optical unit 5 being configured to have one or more functions of light transmission, light diffusion, transmittance increase, or light condensation. In addition, the optical unit 5 can also be used for providing physical protection for the light-emitting unit 2, so as to prevent the light-emitting unit 2 from being damaged by external force.

The optical unit 5 includes a first optical member 51, the first optical member 51 is covered outside the first light source 22, and light generated when the first light source 22 operates is emitted from the LED lighting device after passing through the first optical member 51. In this embodiment, the mounting surface 412 forms a mounting groove 413 due to a position difference from the outer side surface 411. In one embodiment, at least a portion of the first optical member 51 is received in the mounting groove 413. In an embodiment, the first optical member 51 is completely accommodated in the mounting groove 413, that is, the first optical member 51 is not beyond the range defined by the outer side surface 411 in the radial direction of the LED lighting device. In addition, the outer surface of the first optical member 51 has a substantially smooth transition with the outer surface 411 to make the heat exchange unit 4 of the LED lighting device more overall in appearance. Specifically, the radius of curvature of the outer surface of the first optical member 51 is substantially or entirely the same as the radius of curvature of the outer side surface 411. In the present embodiment, the outer side surface 411 and the outer surface of the first optical member 51 together constitute a surface of the radially outer side of the LED lighting device. Wherein the thermal conductivity of the base 41 is greater than the thermal conductivity of the first optical member 51. And the area of the outer surface 411 occupying the radially outer surface of the LED lighting device is larger than the area of the outer surface of the first optical member 51 occupying the radially outer surface of the LED lighting device, so that the radially outer surface of the LED lighting device has a more efficient heat dissipation efficiency. Further, the area of the outer side surface 411 may occupy more than 65% of the area of the surface radially outward of the LED lighting device. In addition, the outer surface of the first optical member 51 is configured to be transparent to light generated when the light emitting unit 2 is operated, so as to visually enhance the light emitting effect of the radially outer surface of the LED lighting device, and the area of the outer surface of the first optical member 51 is configured to occupy at least 15% or more of the area of the radially outer surface of the LED lighting device, so as to enhance the lateral light emitting area of the LED lighting device, that is, the area of the outer surface 411 occupies not more than 85% of the area of the radially outer surface of the LED lighting device.

In another embodiment, to generate a better light treatment effect, the first optical member 51 exceeds the range (not shown) defined by the outer side surface 411 in the radial direction of the LED lighting device, that is, the outer surface of the first optical member 51 and the outer side surface 411 are in a staggered pattern. Specifically, the radius of curvature of the outer surface of the first optical member 51 is smaller than that of the outer surface 411, and the outer surface 411 and the outer surface of the first optical member 51 together constitute a radially outer surface of the LED lighting device.

The mounting groove 413 forms a slot 414 (i.e., a fixing unit for fixing the first optical member 51) at an edge of the mounting surface 412, and the side of the first optical member 51 has a flange 511, the flange 511 being disposed in the slot 414. When mounted, the first optical member 51 is inserted into the insertion groove 414 in the axial direction of the heat exchange unit 4. In some embodiments, the first optical member 51 may be further fixed, such as by providing rivets, bolts, glue, snaps, or other connectors to fix the first optical member 51 to the heat exchange unit 4.

The first optical member 51 in the present embodiment has a light diffusing function. In one embodiment, the surface of the first optical member 51 is provided with a diffusion coating so as to have a light diffusion function. In one embodiment, the first optical member 51 has a light diffusing function due to its own material property, such as a plastic material having a light diffusing function according to the prior art.

As shown in fig. 22 to 24, in some embodiments, to enhance the light-emitting effect of the side surface of the lamp, the central angle occupied by the outer surface 411 on the radial outer side of the LED lighting device may be smaller than the central angle occupied by the outer surface of the first optical member 51 on the radial outer side of the LED lighting device, so that the radial outer side surface of the LED lighting device has a larger light-emitting area, so as to enhance the light-emitting effect. That is, on the side of the LED lighting apparatus, the area of the light-emitting portion thereof (the portion of the first optical member 51 exposed to the outside of the LED lighting apparatus, or not shielded) is larger than the area of the light-non-emitting portion (the outer side surface 411). However, to ensure that the outer surface 411 dissipates heat to the outside, it is necessary to ensure that the ratio of the central angle (or area) occupied by the outer surface 411 and the central angle (or area) occupied by the outer surface of the first optical member 51 is not less than 1:2. Since the overall central angle occupied by the outer surface 411 is reduced, the heat dissipation performance may be reduced, and for this purpose, a plurality of heat dissipation strips 4111 may be disposed on the outer surface 411 to increase the surface area thereof, so as to improve the heat dissipation efficiency (having a larger surface area for external radiation), and in addition, the heat dissipation strips 411 may also play a role in preventing slipping. The heat radiation bars 4111 may be provided extending in the axial direction of the heat exchange unit 4.

As shown in fig. 22 to 24, a pitch is provided between the adjacent heat dissipation bars 4111, and the ratio of the size of the pitch to the size of the thickness of the heat dissipation bars 4111 is greater than 0.8. The height dimension of the heat dissipation bar 4111 is set to be not more than the thickness dimension of the heat dissipation bar 4111 (or the height dimension of the heat dissipation bar 4111 is set to be less than or equal to the thickness dimension of the heat dissipation bar 4111) so as to prevent the adjacent heat dissipation bars 4111 from influencing the heat radiated from the outside (the heat dissipation bar 4111 radiates the heat to the adjacent heat dissipation bars 4111).

As shown in fig. 22 to 24, heat dissipation bars 4111 may also be disposed on an inner surface of the base 41 opposite to the outer surface 411. That is, the heat dissipation bar 4111 may be disposed on the outer side surface and/or the inner side surface of the outer side surface 411.

As shown in fig. 22 to 24, since the central angle occupied by the outer surface of the first optical member 51, which occupies the radially outer side of the LED lighting device, increases, the first light sources 22 on the first lamp panel 21 may be arranged in two rows, which are distributed along the circumferential direction of the lamp. The number of fins 42 of the heat exchanging unit 4 may be set to be the same as the number of the first lamp panels 21, and the fins 42 are arranged in one-to-one correspondence with the first lamp panels 21 (the extending direction of the fins 42 corresponds to the middle area of the back surface of the lamp panel 21), so that the heat conduction path may be reduced. In order to improve the heat dissipation efficiency of the fins 42, a plurality of heat dissipation fins 421 may be disposed on the surface of the fins 42 to increase the heat dissipation area of the whole fins 42. The first light source 22 may include more than two sets of LED light beads of different kinds (e.g., color temperature, luminous flux, size, etc.) to provide a basis for color mixing, dimming of the LED lighting device.

As shown in fig. 23, the light-emitting surface of the first light source 22 is spaced from the inner surface of the first optical member 51 by, for example, at least 2mm. The first light source 22 has a beam angle a (the angle formed by the two sides at which the light intensity reaches 50% of the normal light intensity is defined as the beam angle of the LED beads), and in fig. 23, when the light of the first light source 22 is projected onto the first optical member 51 within the beam angle a, at least 60% or more of the width in the width direction of the inner surface of the first optical member 51 has direct light from the first light source 22 within the beam angle a. That is, after the beam angle a of the first light source 22 is projected to the first optical member 51, at least 60% of the first optical member 51 in the width direction is covered. In the above arrangement, the light emitted from the first light source 22 can be projected to the first optical member 51 as uniformly as possible, so as to prevent the beam angle from corresponding to only a local area of the first optical member 51 to cause local intense light, so that the surface of the first optical member 51 generates poor visual effects, such as enhanced visual granular sensation. As shown in fig. 23, the beam angles a of the two sets of first light sources 22 at least partially overlap after being projected onto the first optical member 51. In other embodiments, the above criteria can be met when a set of first optical members 51 corresponds to only one row of first light sources 22, so as to reduce the visual influence of the first optical members 51, such as graininess.

As shown in fig. 13 to 17 and 19 to 21, in an embodiment, the LED lighting device may further include an electrical connection unit, where the electrical connection unit is configured to electrically connect the plurality of groups of first lamp panels 21. The electrical connection unit comprises an electrical connection board 201, on which electrical connection board 201 a circuit layer is arranged, which electrical connection board 201 is configured to be connected (structurally and/or electrically) with at least two or more groups of first light panels 21. And the electrical connection plate 201 is electrically connected to the power supply 3. In this way, the connection between the sets of first light panels 21 and the power supply 3 can be simplified. In one embodiment, the plurality of groups of first light panels 21 are connected to the electrical connection board 201.

As shown in fig. 19 to 21, in an embodiment, the electrical connection plate 201 is configured in a ring shape, and the circuit layer is disposed on the electrical connection plate 201. At least a part of the fins 42 in the present embodiment extend beyond the base 41 at one end of the heat exchange unit 4 in the longitudinal direction, that is, a part of the fins 42 is exposed outside the base 41 in the longitudinal direction of the heat exchange unit 4. The electric connection plate 201 is sleeved on the part of the fin 42 exposed out of the base 41. At this time, the electrical connection plate 201 corresponds to one end of the first optical member 22, and forms a limit for one end of the first optical member 22.

The electrical connection board 201 in this embodiment is provided with a plurality of fixing holes 2011, and the first light panel 21 passes through the fixing holes 2011 and is connected to the electrical connection board 201. For example, after passing through the fixing hole 2011, the first light panel 21 is directly fixed to the electrical connection plate 201 by welding. For another example, the first lamp panel 21 is connected to the electrical connection plate 201 by a wire after passing through the fixing hole 2011. In this embodiment, the first light panel 21 has a first portion attached to the base 41 and a second portion exposed outside the base 41, and the second portion is disposed in the fixing hole 2011, so that the second portion can be fixed by the fixing hole 2011, and movement of the second portion of the first light panel 21 in the radial direction of the LED lighting device is limited. In addition, the electrical connection board 201 adopts a PCB (i.e., a printed circuit board), and the first lamp panel 21 adopts an aluminum substrate, and the thermal expansion coefficients of the electrical connection board 201 and the first lamp panel 21 are different. Since the second portion of the first lamp panel 21 is not fixed to the base 41, the electrical connection plate 201 can move synchronously with the second portion of the first lamp panel 21 when it expands due to heat, so as to prevent the disconnection of the electrical connection point therebetween.

The LED lighting device may further include a first cover 202, where the first cover 202 covers the electrical connection board 201 to prevent the electrical connection board 201 and the first lamp panel 21 from being directly exposed. In the present embodiment, the first cover 202 is disposed at one end of the first lamp panel 21 and/or the first optical member 22.

The LED lighting device may further include a second cover 203, where the second cover 203 is fixed to the heat exchange unit 4 and located at the other end of the first lamp panel 21 opposite to the electrical connection plate 201. The second cover 203 is disposed at the other end of the first lamp panel 21 and/or the first optical member 22 opposite to the first cover 202. Thus, the positions of the first lamp panel 21 and/or the first optical member 22 can be defined by the first cover 202 and the first cover 203.

As shown in fig. 1 to 5, 8 and 9, the light emitting unit 2 may further include a second light panel 23 and a second light source 24, where the second light source 24 is fixed on the second light panel 23. The second light source 24 in this embodiment may be an LED light bulb in the prior art. The second lamp plate 23 is attached to the end face of the heat exchange unit 4 far away from the end of the lamp cap 1, so that the second lamp plate 23 can rapidly conduct heat to the heat exchange unit 4. Specifically, in some embodiments, the second light plate 23 is riveted to the heat exchange unit 4. In some embodiments, the second lamp panel 23 is connected to the heat exchange unit by bolts. In some embodiments, the second lamp panel 23 is welded to the heat exchange unit 4. In some embodiments, the second lamp panel 23 and the heat exchange unit 4 are adhered and fixed by using an adhesive with high thermal conductivity. The second lamp panel 23 in the present embodiment is provided with 1 or more groups. The second light sources 24 are disposed behind the second light panel 23, and the second light sources 24 are substantially annularly distributed. In this embodiment, the second light source 24 provides downward illumination when the lamp cap 1 is mounted vertically. The first light source 22 and the second light source 24 are arranged to emit light in different directions.

The optical unit 5 may further include a second optical member 52, where the second optical member 52 is covered outside the second light source 24. The second optical member 52 in the present embodiment has a light diffusing function. In one embodiment, the second optical member 52 is provided with a diffusion coating on its surface to provide a light diffusing function. In one embodiment, the second optical member 52 has a light diffusing function due to its own material property, such as a plastic material having a light diffusing function according to the prior art.

As shown in fig. 13 to 17, in an embodiment, the second lamp panel 23 is disposed in a middle area of the end surface of the heat exchange unit 4, and the second lamp panel 23 is directly or indirectly connected to the fins 42 only. That is, in the projection direction of the axial direction of the heat exchange unit 4, the second lamp panel 23 overlaps only the fins 42, not the base 41. To solve the heat dissipation of the second lamp panel 23, the LED lighting device of the present embodiment may further include a heat conducting portion 204 for rapidly conducting the heat conducted to the second lamp panel 23 during the operation of the second light source 24 to the fins 42. In this embodiment, the area of the second lamp panel 23 occupied by the fins 42 when projected onto the second lamp panel 23 along the axial direction of the LED lighting device is smaller than the contact area between the heat conducting portion 204 and the fins 42. In this embodiment, if the end surface of the fin 42 is directly contacted with the second lamp panel 23, the heat dissipation requirement may not be met due to insufficient heat exchange area. The heat conducting portion 201 in the present embodiment is cup-shaped and is fixed to the fin 42 by a bolt. The second light plate 23 may be attached to the heat conducting portion 204, and may be connected by bolts, glue, or buckles. Meanwhile, the second optical member 52 is covered on the second light panel 23, so long as the second light panel 23 is completely covered. Further, the second optical member 52 covers the heat conducting portion 204 to prevent the heat conducting portion 204 from being exposed, and to avoid the external direct contact with the heat conducting portion 204.

In order to improve the uniformity of the light distribution of the LED lighting device, the present embodiment needs to balance the light intensity value of the LED lighting device in the lateral light emitting direction and the light intensity value of the LED lighting device in the downward light emitting direction. For example, in the light intensity distribution in the longitudinal cross-sectional direction of the LED illumination apparatus, the ratio of the light intensity value of any beam angle of downward light emission to the light intensity value of any beam angle of lateral light emission is set to be 1:0.6 to 1.5. Further, the ratio of the light intensity value of any beam angle of downward light to the light intensity value of any beam angle of lateral light is set to be 1:0.8 to 1.5. Further, the ratio of the light intensity value of any beam angle of downward light to the light intensity value of any beam angle of lateral light is set to be 1:1 to 1.4. In this embodiment, the light intensity value of any beam angle of downward light emission refers to the light intensity value in the light emission range of-40 to 40 in fig. 18, and the light intensity value of any beam angle of lateral light emission refers to the light intensity value in the light emission range of-40 to-100 and 40 to 100 in the drawings. As shown in fig. 18 to 19, in an embodiment, in order to make the light distribution more uniform, the arrangement density of the second light sources 24 may be set to be greater than that of the first light sources 21. In one embodiment, the ratio of the arrangement density of the first light sources 21 at the end of the LED lighting device to the arrangement density of the second light sources 24 at the side of the LED lighting device is 1:0.8-1.2. In one embodiment, the ratio of the arrangement density of the first light sources 21 at the end of the LED lighting device (the number of the first light sources 21 arranged per unit area) to the arrangement density of the second light sources 24 at the side of the LED lighting device (the number of the second light sources 22 arranged per unit area) is 1:0.9-1.1. In one embodiment, the ratio of the arrangement density of the first light sources 21 at the end of the LED lighting device to the arrangement density of the second light sources 24 at the side of the LED lighting device is 1:0.95-1.05. In the above-described embodiment, the arrangement density of the second light sources 24 at the end portion of the LED lighting apparatus is a value obtained by dividing the end surface area (end surface contour is circular or substantially circular, whose diameter is the diameter of the LED lighting apparatus in the lateral direction) of the end portion of the LED lighting apparatus at which the second light sources 24 are arranged by the number of the second light sources 24. And the arrangement density of the first light sources 21 of the side portions of the LED lighting apparatus is a value obtained by dividing the area of the side portion of the LED lighting apparatus where the first light sources 21 are arranged (the side portion is annular, the diameter thereof is the diameter of the LED lighting apparatus in the lateral direction, and the length thereof is the length of the base 41) by the number of the first light sources 21.

As shown in fig. 1 to 4, the inner layer surface of the heat exchange unit 4 in the present embodiment is provided with a plurality of fins 42. The fins 42 extend along the axial direction of the LED lighting device, and a plurality of the fins 42 form a receiving space on the radial inner side of the LED lighting device, and at least a portion of the power supply 3 is disposed in the receiving space. In one embodiment, at least 80% of the power supply 3 in the longitudinal direction (in the axial direction of the LED lighting device) is located in the accommodating space, so as to improve the space utilization. In this embodiment, the power supply 3 is completely disposed in the accommodating space, so that the power supply 3 does not occupy the length dimension (dimension in the axial direction of the LED lighting device) of the LED lighting device additionally, and the overall lamp size is more compact. In one embodiment, the power supply 3 is located entirely in the accommodating space in the longitudinal direction (in the axial direction of the LED lighting device).

The power supply 3 may be directly disposed in the accommodating space, but the heat exchange unit 4 is electrically isolated from the power supply 3.

An isolation unit may also be provided in this embodiment to isolate the power source 3 from the fins 42 for thermal or electrical isolation. The isolation unit comprises an isolation tube 6, the isolation tube 6 is fixed in the accommodating space, and the power supply 3 is fixed in the isolation tube 6 to isolate the power supply 3 from the heat exchange unit 4. The isolation tube 6 is provided extending in the axial direction of the LED lighting device, and the isolation tube 6 may be provided coaxially or substantially coaxially with the heat exchange unit 4. The isolation tube 6 may be configured to have an insulating and/or heat-insulating function, for example, a material conforming to the above functions, such as plastic, rubber, plastic steel, etc., so as to prevent heat generated when the light emitting unit 2 is operated and heat generated when the power supply 3 is operated from affecting each other, and to realize electrical isolation of the power supply 3 from the heat exchanging unit 4. In one embodiment, the isolation tube 6 may be connected to the lamp cap 1 to achieve fixation, and the isolation tube 6 may be fixed to the lamp cap 1 by bolts, buckles, or bonding. In one embodiment, the isolation tube 6 may be fixed to the heat exchange unit 4, and the isolation tube 6 may be fixed to the heat exchange unit 4 by bolts, buckles, or bonding. In this embodiment, the base 1 is fixed to the heat exchange unit 4. Specifically, as shown in fig. 20, the fins 42 of the heat exchange unit 4 are provided with fixing holes, and the lamp cap 1 is provided with holes, and bolts pass through the holes to connect with the fixing holes on the fins.

As shown in fig. 4, 8 and 10, in the present embodiment, the LED lighting device is configured with a first convection channel 7, and the first convection channel 7 is formed in the isolation tube 6, so as to dissipate heat from the power supply 3 in the isolation tube 6 by convection. The first convection channel 7 forms a first opening 71 at one axial end of the isolation tube 6, and the first convection channel 7 forms a second opening 72 at the other axial end of the isolation tube 6.

As shown in fig. 4, 7 and 8, in the present embodiment, the LED lighting device is configured with a second convection channel 8, the second convection channel 8 is formed between the fins 42, and the second convection channel 8 convectively dissipates heat to the fins 42 (heat generated when the light emitting unit 2 operates is conducted to the fins 42 and dissipated by the fins 42). The second convection channel 8 forms a third opening 81 at one end between the fins (one end in the axial direction of the LED lighting device), and the second convection channel 8 forms a fourth opening 82 at the other end between the fins (the other end in the axial direction of the LED lighting device). In this embodiment, the surfaces of the fins 42 each correspond to the second convection channel 8. That is, the surface of the fin 42 forms the inner wall of the second convection channel 8, thereby making the exchange efficiency of the convection air with the fin 42 higher.

In this embodiment, the power supply 3 and the light emitting unit 2 use different convection channels to dissipate heat, so as to prevent the heat of the two from affecting each other.

In this embodiment, the length of the first convection channel 7 and/or the second convection channel 8 in the axial direction of the LED lighting device is 50%, 55%, 60%, 65% or 70% or more of the total length of the LED lighting device, so as to ensure that the first convection channel 7 and/or the second convection channel 8 have a sufficient length to satisfy the chimney effect during convection.

In this embodiment, the first opening 71 and the third opening 81 are located at one end of the heat exchange unit 4 or the isolation tube 6 relatively far from the lamp cap 1. The first opening 71 and the third opening 81 are one end of the intake air at the time of convection. As shown in fig. 4 to 11, the LED lighting apparatus in the present embodiment is provided with a cover 9, and the cover 9 covers the first opening 71 and the third opening 81. In one embodiment, the cover 9 may be a separate component. In one embodiment, the cover 9 may be formed as a unitary member with the second optical member 52.

The cover 9 in this embodiment has a first portion 91, and the first portion 91 corresponds to the first opening 71. For example, the first opening 71 falls completely within the first portion 91 when projected onto the plane of the first portion 91. The first portion 91 is provided with a first air intake hole 911. The first air intake hole 911 may have one or more groups. The cross-sectional area of the first air inlet hole 911 occupies at least 30% or more and not more than 80% of the area of the single side of the first portion 91, thereby ensuring that sufficient air can enter through the first air inlet hole 911 to perform convection and that the first portion 91 can have a sufficient supporting structure to ensure structural strength of the first portion 91. Further, the maximum inscribed circle diameter of the first air intake hole 911 is configured to be less than 2mm and greater than 1mm to prevent the excessively small first air intake hole 911 from obstructing the intake of air and to prevent the preliminary prevention of the entry of insects from affecting the performance of the power supply 3.

As shown in fig. 4 to 12, a dust screen 93 is disposed on one side of the first portion 91 in the present embodiment, and the dust screen 93 has a plurality of holes for air intake. The opening area of the single hole is smaller than that of the single first air intake hole 911. The dust screen 93 may be fixed to the first opening 71 of the isolation tube 6, or the dust screen 93 may be fixed to the first portion 91 and correspond to the first opening 71.

As shown in fig. 4 to 11, the cover 9 in the present embodiment has a second portion 92, and the second portion 92 corresponds to the third opening 81. For example, the third opening 81, when projected onto the plane of the second portion 92, falls completely or at least 65% within the scope of the second portion 92. The second portion 92 is provided with a second air intake hole 921. The second air intake holes 921 may have one or more groups. The cross-sectional area of the second air inlet 921 occupies at least 30% or more of the area of the single side of the second portion 92, and does not exceed 80%, thereby ensuring that sufficient air can enter through the second air inlet 921 for convection, and ensuring that the second portion 92 has a sufficient supporting structure and the structural strength of the first portion 92. When the influence of insects and the like on the second convection channel 8 (no power is supplied to the second convection channel 8) is not considered, the maximum inscribed circle diameter of the second air inlet hole 921 is configured to be larger than the maximum inscribed circle diameter of the first air inlet hole 911, so that the air inlet of the second air inlet hole 921 is improved, and the heat dissipation efficiency of the second convection channel 8 is improved.

As shown in fig. 13 to 16, in one embodiment, when the second lamp panel 23 is disposed in the middle area of the end surface of the heat exchange unit 4, the positions of the first opening 71 and the second opening 81 are changed accordingly. In the present embodiment, the position of the end of the isolation tube 6 is changed, and specifically, the end of the isolation tube 6 is kept apart from the end of the LED lighting device (the heat exchange unit 4). The air of convection enters from the second opening 81 and then enters the first opening 71. The second opening 81 is a portion of the end surface of the heat exchange unit 4 that is not shielded (not covered by the second optical member 52 and the first cover 202). In the present embodiment, both the first convection passage 7 and the second convection passage 8 are taken in from the second opening 81. Since the position of the end of the isolation tube 6 in the present embodiment is changed, the cover 9 may be provided at the tube portion of the isolation tube 6 at this time. The cover 9 can be used in combination with a dust screen.

As shown in fig. 1 to 4, the power supply 3 in the present embodiment includes an electronic component 31 and a circuit board 32, and the electronic component 31 is fixed on the circuit board 32. The length of the circuit board 32 in the present embodiment accounts for 60% or more of the length of the heat exchange unit 4 (the dimension in the axial direction of the LED lighting apparatus), and the circuit board 32 is entirely located within the space defined by the heat exchange unit 4. Further, the length of the circuit board 32 accounts for 70% or more of the length (the dimension in the axial direction of the LED lighting device) of the heat exchange unit 4. Further, the length of the circuit board 32 occupies 80% or more of the length of the heat exchange unit 4 (the dimension in the axial direction of the LED lighting device). In this way, the circuit board 32 can be made to have a larger size to dispose the electronic components 31, and a larger interval can be disposed between the heating elements (e.g., resistor, transformer, inductor, IC) in the electronic components. When the number of the electronic components 31 is fixed, the longer the length of the circuit board 32 is, the easier the distribution mode of the electronic components 31 is configured. To prevent the electronic components 31 from being excessively concentrated to thermally influence each other. When the electronic components 31 are excessively concentrated, the rate of convection air passage may be affected, and the heat dissipation efficiency may be affected.

As shown in fig. 25 to 35, an LED lighting apparatus is shown, the basic structure of which is the same as that of the foregoing embodiment. The LED lighting device includes: a lamp cap 1, a lighting unit 2, a power supply 3 and a heat exchange unit 4. Wherein the lamp cap 1 is configured for connection to an external power supply unit, such as a lamp holder. The heat exchange unit 4 is directly or indirectly connected to the burner 1. The light emitting unit 2 is electrically connected with the power supply 3, the light emitting unit 2 is fixed on the heat exchange unit 4, and the light emitting unit 2 and the heat exchange unit 4 form a heat conduction path.

As shown in fig. 25 to 30, the heat exchange unit 4 includes a base 41 and fins 42, and the light emitting unit 2 is provided on a surface of the base 41. Specifically, the cross section of the base 41 is configured as a substantially annular structure or a tubular structure. The fins 42 are provided extending along the radially inner side of the base 41, and the fins 42 are provided with plural sets.

The light emitting unit 2 includes a first light plate 21 and a first light source 22, the first light source 22 is disposed on the first light plate 21, and the first light plate 21 is disposed on the outer surface of the base 41. The first lamp panel 21 in the present embodiment is adhered to the outer surface of the base 41, so as to facilitate the first lamp panel 21 to rapidly conduct heat to the base 41. The first lamp panel 21 is provided extending in the axial direction of the LED lighting device in the longitudinal direction thereof. The first lamp panel 21 may be fixed to the base 41 (e.g., riveted, bolted, glued, or connected by a socket, etc.) in substantially the same manner as the previous embodiments. The first lamp panels 21 in the present embodiment are provided with a plurality of groups, and the plurality of groups of first lamp panels 21 are arranged along the circumferential direction of the heat exchange unit 4. In this embodiment, the first light source 22 provides at least lateral illumination when the lamp cap 1 is mounted vertically.

At least a portion of the fins 42 on the base 41 in the present embodiment directly corresponds to the back surface of the first lamp panel 21. For example, the fins 42 corresponding to the first light panel 21 at least partially overlap the first light panel 21 when projected onto the plane of the first light panel 21. Further, the fins 42 corresponding to the first light panel 21 correspond to a middle area of the first light panel 21 when projected onto the plane of the first light panel 21. Therefore, the heat conduction path from the first lamp panel 21 to the fins 42 can be reduced, and the heat dissipation efficiency can be improved. The number of fins 42 may be an integer multiple of the number of first light panels 21. Each first lamp panel 21 has at least one fin 42 corresponding thereto.

The fin 42 in the present embodiment includes a first portion 4201 located inside the base 41 and a second portion 4202 exposed outside the base 41, wherein the second portion 4202 exposed outside the base 41 is not shielded by the base 41 in the radial direction of the LED lighting device. Specifically, the first portion 4201 and the second portion 4202 of the fin 42 extend along the same direction, the first portion 4201 is located entirely inside the base 41 in the axial direction of the base 41, and the second portion 4202 is located outside the base 41 in the axial direction of the base 41. The second portion 4202 may directly radiate heat to the air outside the LED lighting device, and exposing the second portion 4202 to the outside of the base 41 may improve the overall heat dissipation performance of the heat exchange unit 4, and thus may reduce the required external dimensions and/or weight of the heat exchange unit 4. In this embodiment, the weight of the heat exchange unit 4 does not exceed 350g on the premise that the LED lighting device does not use active heat dissipation (i.e. does not use a fan or the like for heat dissipation), and the LED lighting device can generate luminous flux of 7500 lumens or more. That is, the heat exchange unit 4 has a weight of not more than 350g, and can dissipate heat generated when a luminous flux of 7500 lumens or more is generated. Further, the weight of the heat exchanging unit 4 does not exceed 320g (more than 250 g), whereas the LED lighting device may generate a luminous flux of over 8000 lumens (not more than 9000 lumens). On the other hand, the heat exchange unit 4 can dissipate heat generated by a luminous flux of at least 20, 22, 25 or 26 lumens per gram of weight.

In one embodiment, the ratio of the length of second portion 4202 to the length of fin 42 is 1:4-8. In one embodiment, the ratio of the length of second portion 4202 to the length of fin 42 is 1:4-6. In one embodiment, the ratio of the length of second portion 4201 to the length of fin 42 is 1:4.5-5.5. The above arrangement can ensure the length of the first lamp panel 21 to have a longer light emitting area while allowing the second portion 4202 to have a sufficient length for heat dissipation.

The LED lighting device in the present embodiment further includes an optical unit 5, and the optical unit 5 is configured to have one or more functions of light transmission, light diffusion, transmittance increase, or light condensation.

As shown in fig. 31 and 32, the light emitting unit 2 may further include a second lamp panel 23 and a second light source 24, and the second light source 24 is disposed on the second lamp panel 23. The second light plate 23 is disposed at an end of the heat exchange unit 4 and forms a heat conduction path with the heat exchange unit 4, so that heat generated during operation of the second light source 24 can be rapidly conducted to the heat exchange unit 4. Specifically, the second light plate 23 may contact at least a portion of the end of the base 41 and at least a portion of the fin 42 at the same time. The second lamp panel 23 may be provided in a ring shape. When the lamp head 1 is vertically installed, the second light source 24 is disposed downward to provide downward light, and the second light source 24 is located at the lower end of the heat exchange unit 4.

The second lamp panel 23 may be fixed to the heat exchange unit 4 by riveting, bolting, adhesion, or the like. The second lamp panel 23 in this embodiment is connected to the heat exchange unit 4 by means of riveting. Specifically, a rivet hole or a rivet groove is formed in the base 41, and the rivet is fixed to the rivet hole or the rivet groove after passing through the second lamp panel 23.

The first lamp panel 21 and the second lamp panel 24 in this embodiment are connected by direct welding, and are electrically connected, so that connection wires can be not required to be arranged for connection, the structure is simpler, and the risk of breakage of the connection wires or falling of welding spots is avoided. Specifically, the second lamp panel 24 is provided with a hole or a positioning slot 231, and after the end of the first lamp panel 21 is inserted into the hole or the positioning slot 231 to be positioned, the two lamp panels are directly connected by welding. In this embodiment, a positioning groove 231 is disposed at the outer edge of the second lamp panel 24, and the first lamp panel 21 is inserted into the positioning groove 231 to be matched. In some embodiments, the hole or the positioning groove may not be provided, and the end of the first light panel 21 is attached to the outer edge of the second light panel 24 and then connected by welding.

As shown in fig. 25 to 30, the optical unit 5 may include a first optical member 51, and the first optical member 51 is covered outside the first light source 22. Specifically, the first optical members 51 are provided in plural groups and correspond to the first lamp panel 21. The first optical member 51 may be constructed and installed in the same manner as in the previous embodiments.

The optical unit 5 may further include a second optical member 52, where the second optical member 52 is covered outside the second light source 24 (the second light panel 23). The second optical member 52 in the present embodiment may have a light diffusing function. In one embodiment, the second optical member 52 is provided with a diffusion coating on its surface to provide a light diffusing function. In one embodiment, the second optical member 52 has a light diffusing function due to its own material property, such as a plastic material having a light diffusing function according to the prior art. The basic structure of the second optical member 52 in this embodiment can also be the same as that of the foregoing embodiment.

As shown in fig. 29 and 30, in the present embodiment, the base 41 includes a first unit 4101 and a second unit 4102. The first units 4101 and the second units 4102 are alternately arranged in the circumferential direction of the base 41. The first lamp panel 21 is disposed on the first unit 4101, the first optical member 51 is covered on the outside of the first unit 4101, and the outer surface of the second unit 4102 is exposed to the outside of the LED lighting device, so that the LED lighting device can directly dissipate heat (radiate heat to the outside air). The first unit 4101 is provided with a first slot 41011, and the first lamp panel 21 is inserted into the first slot 41011 for positioning and fixing. In this embodiment, at least one fin 42 is disposed on the inner surface of the first unit 4101 for heat dissipation. The second unit 4102 is provided with a second slot 41021, and the first optical member 51 is inserted into the second slot 41021 to be fixed in position. The outer surface of the second unit 4102 is concave or convex to increase the heat dissipation area of the outer surface thereof. At least one fin 42 is disposed on an inner side surface of the second unit 4101 to dissipate heat. A caulking hole or a caulking groove on the base 41 is formed between the first unit 4101 and the second unit 4102.

As shown in fig. 32 to 34, the aforementioned isolation unit is also provided in the present embodiment. The isolation unit comprises an isolation tube 6, the isolation tube 6 extends along the axial direction of the LED lighting equipment, and the power supply is arranged inside the isolation tube 6. The insulating tube 6 may be connected to the burner 1. The isolation tube 6 may also be connected to the heat exchange unit 4. The power supply in the isolation tube 6 dissipates heat in a natural convection manner (passive heat dissipation system design, such as a fan). A portion of the spacer tube 6 is located inside the first portion 4201 of the fin 42 and a portion is located inside the second portion 4202 of the fin 42. The isolation tube 6 may be configured to have an insulating and/or heat-insulating function, thereby preventing heat generated when the light emitting unit 2 operates and heat generated when the power source operates from affecting each other and achieving electrical isolation of the power source from the heat exchanging unit 4. The isolation tube 6 may be made of an insulating material such as plastic.

The second portions 4202 of the fins 42 in this embodiment are snap fit to the isolation tube 6 to connect the heat exchange unit 4 to the isolation tube 6. In addition, the isolation tube 6 is connected to the base 1.

As shown in fig. 25 to 34, in the present embodiment, the LED lighting device is also provided with a first convection channel 7, and the first convection channel 7 is formed in the isolation tube 6 to dissipate heat from the power supply in the isolation tube 6 by convection. The first convection channel 7 forms a first opening 71 at one axial end of the isolation tube 6, and the first convection channel 7 forms a second opening 72 at the other axial end of the isolation tube 6.

As shown in fig. 35, the LED lighting device may not be provided with the first convection channel (in this case, the first opening 71 and the first air inlet hole 911 on the first portion 91 of the cover 9 are not required), but may radiate heat from the power supply 3 by heat conduction. Specifically, the power supply 3 is disposed inside the isolation tube 6, the isolation tube 6 is filled with a heat conducting material 601 to cover the power supply 3, and the power supply 3 forms a heat conducting path with the isolation tube 6 through the heat conducting material 601. Illustratively, the thermally conductive material 601 may be a thermally conductive paste. And the heat conduction material 601 is used for coating the power supply 3, so that the power supply 3 can be waterproof and dampproof.

In the present embodiment, the power supply 3 includes an electronic component 31 and a circuit board 32, and the electronic component 31 is fixed on the circuit board 32. The electronic component 31 includes a heating element 311, and the heating element 311 is an electronic component that generates relatively high heat when the LED lighting device is operated, such as a resistor, a transformer, an inductor, an IC, a transistor, and the like. In one embodiment, to ensure that heat generated by the heat generating element 311 during operation is dissipated as quickly as possible through heat conduction through the heat conducting material 601, at least 85% of the surface area of the heat generating element 311 exposed to the outside (excluding the contact surface with the power board 32 during installation) adheres to the heat conducting material 601. In one embodiment, at least 90% of the surface area of the heat generating element 311 exposed to the outside (excluding the contact surface with the power board when mounted) is attached to the heat conductive material 601. In one embodiment, at least 95% of the surface area of the heat generating element 311 exposed to the outside (excluding the contact surface with the power board when mounted) is attached to the heat conductive material 601. In one embodiment, at least 85%, 90% or 95% of the surface area of any heat generating element 311 exposed to the outside (excluding the contact surface with the power board when mounted) is attached to the heat conductive material 305. Therefore, the heat flow bottleneck on the heat conduction path can be avoided as much as possible.

In the present embodiment, the isolation tube 6 has a first portion 61 and a second portion 62 in the axial direction thereof, and the first portion 61 and the second portion 62 have equal lengths in the LED lighting apparatus length direction. In some embodiments, the sum of the lengths of the first portion 61 and the second portion 62 is equal to the length of the isolation tube 6. The weight of the thermally conductive material 601 in the first portion 61 is set to be greater than the weight of the thermally conductive material 601 in the second portion 62. At least a portion of the first portion 61 corresponds to the fins 42 (i.e., the second portions 4202 of the fins 42) exposed to the exterior of the base 41. The portion of the fin 42 exposed to the outside of the base 41 has higher heat dissipation efficiency, and thus, the portion of the isolation tube 6 directly corresponding to the fin 42 exposed to the outside of the base 41 can have higher heat dissipation efficiency. Therefore, by providing more thermally conductive material and/or electronic components 31 in the first portion 61, the electronic components 31 within the first portion 61 may have a better heat dissipation effect. In other words, more electronic components 31 or heat conductive materials can be disposed in the first portion 61 to more effectively utilize the heat dissipation effect of the fins 42 exposed outside the base 41.

In some embodiments, at least a portion of the first portion 61 of the isolation tube 6 corresponds to the fins 42 (i.e., the second portions 4202 of the fins 42) exposed to the exterior of the base 41, and thus, more electronic components 31 may be disposed in the first portion 61. I.e. the number of electronic components 31 in the first portion 61 is greater than the number of electronic components 31 in the second portion 62. In some embodiments, the number of heat generating elements 311 in the first portion 61 is greater than the number of heat generating elements 311 in the second portion 62.

In some embodiments, at least a portion of the first portion 61 of the isolation tube 6 corresponds to the fins 42 (i.e., the second portions 4202 of the fins 42) exposed to the exterior of the base 41, thus allowing more heat to be generated by the electronic components 31 in the first portion 61. I.e. the total heat generating surface area of the electronic component 31 in the first portion 61 is larger than the total heat generating surface area of the electronic component 31 in the second portion 62. In some embodiments, the total surface area of the heat generating elements 311 in the first portion 61 is greater than the total surface area of the heat generating elements 311 in the second portion 62.

The inside of the burner 1 in this embodiment is provided with a thermally conductive material 101. The heat conductive material 101 inside the burner 1 is integrated with the heat conductive material 601 inside the insulating tube 6 to increase the stability of the connection of the insulating tube 6 with the burner 1. In addition, by providing the heat conductive material 101 inside the base 1, at least a part of heat generated when the power supply 3 is operated can be dissipated to the outside through the base 1.

Similarly, in the present embodiment, the LED lighting device is also provided with a second convection channel 8, the second convection channel 8 is formed between the fins 42, and the second convection channel 8 convectively dissipates heat from the fins 42 (the heat generated during the operation of the light emitting unit 2 is conducted to the fins 42 and dissipated by the fins 42). The second convection channel 8 forms a third opening 81 at one end between the fins (one end in the axial direction of the LED lighting device), and the second convection channel 8 forms a fourth opening 82 at the other end between the fins (the other end in the axial direction of the LED lighting device).

In this embodiment, the power supply 3 and the light emitting unit 2 use different convection channels or use different heat dissipation modes to dissipate heat, and the isolation tube 6 (the isolation tube 6 is made of a material with a low thermal conductivity, such as plastic) can prevent the heat of the two from affecting each other.

In this embodiment, the first opening 71 and the third opening 81 are located at one end of the heat exchange unit 4 or the isolation tube 6 relatively far from the lamp cap 1. The first opening 71 and the third opening 81 are one end of the intake air at the time of convection. The LED lighting device in the present embodiment is provided with a cover 9, and the cover 9 covers the first opening 71 and the third opening 81. In one embodiment, the cover 9 may be a separate component. In one embodiment, the cover 9 may be formed as a unitary member with the second optical member 52.

The cover 9 in this embodiment has a second portion 92, the second portion 92 corresponding to the third opening 81. For example, the third opening 81, when projected onto the plane of the second portion 92, falls completely or at least 65% within the scope of the second portion 92. The second portion 92 is provided with a second air intake hole 921. The second air intake holes 921 may have one or more groups. The cross-sectional area of the second air inlet 921 occupies at least 30% or more of the area of the single side of the second portion 92, and does not exceed 80%, thereby ensuring that sufficient air can enter through the second air inlet 921 for convection, and ensuring that the second portion 92 has a sufficient supporting structure and the structural strength of the first portion 92. When the influence of insects and the like on the second convection channel 8 (no power is supplied to the second convection channel 8) is not considered, the maximum inscribed circle diameter of the second air inlet hole 921 is configured to be larger than the maximum inscribed circle diameter of the first air inlet hole 911, so that the air inlet of the second air inlet hole 921 is improved, and the heat dissipation efficiency of the second convection channel 8 is improved.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the inventors regard such subject matter as not be considered to be part of the disclosed subject matter.

Claims

1. An LED lighting device, comprising:

a lamp base;

a light emitting unit;

the light-emitting unit is electrically connected with the power supply;

a second convection channel which convectively dissipates heat from the fins;

2. The LED lighting device of claim 1, wherein: the power supply comprises an electronic element and a circuit board, wherein the electronic element is fixed on the circuit board, the length of the circuit board accounts for more than 70% of the length of the heat exchange unit, and the circuit board is completely positioned in a space defined by the heat exchange unit.

3. The LED lighting device of claim 1, wherein: the length of the second convection channel in the axial direction of the LED lighting device is 50%, 55%, 60%, 65% or 70% or more of the total length of the LED lighting device.

4. A LED lighting device as claimed in claim 1 or 3, characterized in that: the second convection channel forms a third opening at one end between the fins, and the second convection channel forms a fourth opening at the other end between the fins.

5. The LED lighting device of claim 1, wherein: the light-emitting unit comprises a first lamp panel, the first light source is arranged on the first lamp panel, the light-emitting unit comprises a first optical component, and one group of the first optical components corresponds to one or two columns of the first light sources.

6. The LED lighting device of claim 5, wherein: the lamp further comprises an electric connection unit, wherein the electric connection unit comprises an electric connection plate, and the electric connection plate is configured to be connected with at least more than two groups of first lamp panels.

7. The LED lighting device of claim 6, wherein: the electric connection plate is provided with a fixing hole, and the first lamp panel penetrates through the fixing hole and is connected with the electric connection plate.

8. The LED lighting device of claim 7, wherein: the first lamp panel is provided with a first part attached to the base of the heat exchange unit and a second part exposed out of the base, and the second part is arranged in the fixing hole.

9. The LED lighting device of claim 6, wherein: the electrical connection plate and the first light plate have different coefficients of thermal expansion.

10. The LED lighting device of claim 5, wherein: the area of the outer surface of the first optical member is configured to occupy at least 15% or more of the area of the surface on the radially outer side of the LED lighting device.

11. The LED lighting device of claim 5, wherein: the light-emitting unit comprises a second lamp panel, the second light source is fixed on the second lamp panel, the second lamp panel is attached to the end face of one end, far away from the lamp cap, of the heat exchange unit, the optical unit comprises a second optical component, and the second optical component is covered outside the second light source.

12. The LED lighting device of claim 11, wherein: the second lamp panel is arranged in the middle area of the end face of the heat exchange unit, and in the projection direction of the axial direction of the heat exchange unit, the second lamp panel is only overlapped with the fins.

13. The LED lighting device of claim 4, wherein: the cover body is provided with a second part, the second part corresponds to the third opening, and a second air inlet hole is formed in the second part.