CN112240491B

CN112240491B - Lighting device

Info

Publication number: CN112240491B
Application number: CN201910646983.9A
Authority: CN
Inventors: 何李; 徐敏敏
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2019-07-17
Filing date: 2019-07-17
Publication date: 2022-08-09
Anticipated expiration: 2039-07-17
Also published as: CN112240491A

Abstract

The invention relates to the technical field of lighting devices, and discloses a lighting device which can ensure heat dissipation and electrical insulation and increase loop space, comprising a shell and a radiator, wherein the shell is used for accommodating a main substrate of a lighting circuit, and comprises: the shell wall is provided with openings at two ends; the inner shell wall is arranged in the shell wall in an arc shape in a form of forming a slot space with the shell wall, and a first groove is formed in the part of the shell wall where the inner shell wall is not arranged; the radiator comprises an arc-shaped radiating wall with at least one open end and a second groove formed in the radiating wall, the radiating wall is matched with the corresponding slot space, and the second groove is matched with the corresponding first groove. According to the lighting device, the arc-shaped heat dissipation wall is inserted into the slot space to realize heat dissipation, and meanwhile, the groove formed in the heat dissipation wall is utilized to increase the loop space for arranging the circuit substrate part of the lighting device, or the volume of the shell can be reduced while heat dissipation is ensured, so that the requirement of shell miniaturization is met.

Description

Lighting device

Technical Field

The invention relates to the technical field of lighting devices, in particular to a lighting device which ensures heat dissipation and electrical insulation and increases loop space.

Background

The lighting device includes a lighting circuit main substrate, a housing, and a heat sink, and the housing is engaged with the heat sink to fix the lighting circuit main substrate in an inner space of the housing.

In the prior art, as disclosed in chinese patent application publication No. CN105874886A, an LED lamp is disclosed, and as shown in fig. 1, in order to ensure heat dissipation and electrical insulation of the LED lamp, a housing is provided to be composed of an inner housing wall (i.e., an inner surface in prior art CN 105874886A) and an outer housing wall (i.e., an outer surface in prior art CN 105874886A), and a slot space into which a heat dissipation wall of a heat sink is inserted is formed between the inner housing wall and the outer housing wall. A heat dissipating wall (not shown) is inserted into the slot space to be connected to the housing wall, and a main substrate for mounting the lighting circuit is defined inside the housing wall. Through inserting the heat dissipation wall in slot space for the heating of lighting circuit owner base plate part can be through the outside conduction of heat dissipation wall, in order to guarantee lighting circuit owner base plate part and external electrical insulation, can not cause circuit work abnormal or accelerated ageing because of generating heat to lead to inside temperature rise to exceed operating temperature.

However, in the LED lamp disclosed in the above prior art, the housing has a disadvantage of small circuit space capable of accommodating the circuit substrate portion of the lighting device, and in order to increase the size of the circuit space, if the sizes of the inner housing wall and the housing wall are increased correspondingly, the housing has a large volume, which cannot meet the requirement of miniaturization of the housing.

Disclosure of Invention

The present invention is directed to the above-mentioned technical problem, and an object of the present invention is to provide a lighting device, in which heat dissipation is achieved by inserting an arc-shaped heat dissipation wall into a slot space, and a circuit space for installing a circuit substrate portion of the lighting device is increased by using a groove formed in the heat dissipation wall, or heat dissipation is ensured while the volume of a housing is reduced, thereby meeting the requirement of miniaturization of the housing.

Specifically, the present invention provides a lighting device including a housing accommodating a lighting circuit main substrate and a heat sink, the housing including:

the shell wall is provided with openings at two ends;

the inner shell wall is arranged in the shell wall in an arc shape in a form of forming a slot space with the shell wall, and a first groove is formed in the part of the shell wall where the inner shell wall is not arranged;

the radiator comprises an arc-shaped radiating wall with at least one open end and a second groove formed in the radiating wall, the radiating wall is matched with the corresponding slot space, and the second groove is matched with the corresponding first groove.

Compared with the prior art, according to the lighting device provided by the invention, through the first groove arranged on the shell wall of the shell and the second groove arranged on the heat dissipation wall of the heat sink, when the heat dissipation wall is inserted into the slot space formed between the shell wall and the shell wall, the first groove and the second groove are matched and correspond to each other and are communicated with the space where the main substrate of the lighting circuit is located, namely the internal space of the shell wall to form a loop space, so that the loop space is increased, the size of the main substrate of the lighting circuit can be correspondingly enlarged or the number of components on the main substrate of the lighting circuit can be increased, and the functions of the lighting device can be enhanced. The arrangement of the inner shell wall and the shell wall limits the main substrate of the lighting circuit between the inner shell walls, and isolates the main substrate from the heat sink and the outside, thereby ensuring the electrical insulation of the lighting device.

According to the invention, the heat dissipation wall is inserted into the slot space formed between the inner shell wall and the shell wall, so that the heat dissipation performance can be ensured, the first groove and the second groove are matched and correspond to each other and are communicated with the inner space of the inner shell wall, so that the circuit space is formed, the heat dissipation performance can be ensured, the electrical insulating performance can be ensured, the circuit space can be enlarged, the requirement on the size of a larger main substrate or an electrical component can be met, or the shell can be miniaturized on the premise of the size of the main substrate and the electrical component of the existing lighting circuit.

Preferably, the housing wall is formed in a circular truncated cone shape as a whole, the opening of the slot space faces the lower bottom surface of the circular truncated cone of the housing wall, the heat sink including the second groove portion is formed in a circular truncated cone shape as a whole, and the opening of the heat sink wall faces the upper bottom surface of the circular truncated cone of the heat sink.

According to the preferred scheme, the shell wall is in a circular truncated cone shape, the shape of the heat radiator is matched with that of the shell wall, so that the heat radiating wall of the heat radiator can be inserted into the slot space more closely and is tightly attached to the shell wall, and the heat generated from the main substrate of the lighting circuit and conducted through the heat radiating wall is easier to dissipate while the heat radiating wall is not easy to slip. In addition, the cross section area of the radiating wall in the direction of the opening of the slot space is gradually increased, so that the radiating device is more favorable for quick radiation of heat, and ensures that the radiating performance of the illuminating device is excellent.

Preferably, the inner casing wall is cylindrical as a whole or circular truncated cone-shaped as a whole, and the opening of the slot space faces the circular truncated cone-shaped bottom surface of the inner casing wall.

According to the preferred scheme, the whole inner shell wall is cylindrical, so that the production and processing of the inner shell wall are facilitated, and the heat dissipation wall of the radiator is conveniently inserted into the slot space. The whole body provided with the inner shell wall is in a circular truncated cone shape, the opening of the slot space faces the lower bottom surface of the circular truncated cone of the inner shell wall, and then the heat dissipation wall can be effectively attached to or extrude the outer surface of the inner shell wall after being inserted into the slot space, so that the friction force between the heat sink and the inner shell wall is increased, the heat sink and the inner shell wall are not easy to slip, and the heat dissipation is facilitated.

Preferably, the first grooves are provided in plural numbers, the plural first grooves are provided in rotational symmetry about the central axis of the entirety formed by all the inner casing walls, and the plural second grooves are provided in plural numbers, the plural second grooves are provided in rotational symmetry about the central axis of the entirety formed by all the heat radiation walls.

According to this preferred embodiment, by providing the plurality of first recesses and the plurality of second recesses, the size of the circuit space can be further increased, which is advantageous in that more edges or other electrical components in the lighting circuit main substrate are disposed in the circuit space, and the size of the inner housing wall and the outer housing wall can be reduced by reasonably utilizing the circuit space, thereby further achieving the miniaturization of the housing. The first grooves are arranged around the central axis of the whole formed by all the inner shell walls in a rotational symmetry mode, and the second grooves are arranged around the central axis of the whole formed by all the radiating walls in a rotational symmetry mode, so that heat can be uniformly radiated, local excessive temperature rise is avoided, and radiating performance is ensured. Meanwhile, the first grooves and the second grooves are arranged in a dispersed mode, the structural distribution of the shell and the radiator is even, stress distribution is balanced, and the structural strength of the shell and the radiator can be guaranteed.

Further, preferably, the sum of the central angles corresponding to the openings of the first grooves is 30 ° to 300 °.

According to this preferred scheme, can avoid setting up too little and can't effectively hold lighting circuit owner base plate because of the recess, the size in unable effective increase return circuit space also can avoid setting up too big and lead to the heat radiating area of heat dissipation wall too little because of the recess, the unable effective heat dissipation of heat dissipation wall.

Preferably, the sum of the central angles corresponding to the openings of the first grooves is 115 to 125 °.

In addition, preferably, a side wing is arranged between the inner shell wall and the shell wall, and the side wing, the inner shell wall and the shell wall enclose to form a slot space.

According to the preferred embodiment, the wings have a supporting effect on both the outer shell wall and the inner shell wall, so that the structural strength of the outer shell wall and the inner shell wall can be increased, the outer shell wall or the inner shell wall can be prevented from being inclined, deformed or damaged, and the outer shell wall and the inner shell wall can be protected.

In addition, the lateral wings isolate the loop space from the slot space, so that the main substrate of the lighting circuit positioned in the loop space and the heat dissipation wall positioned in the slot space can be further isolated, and the electrical insulation of the loop space is ensured.

Preferably, the height of the wings is not higher than the height of the inner shell wall.

According to the preferred scheme, the height of the side wings is not higher than that of the inner shell wall, and the side wings cannot influence the insertion connection between the radiator and the shell on the premise of improving the strength of the inner shell wall.

Preferably, the plurality of side wings are arranged rotationally symmetrically around a central axis of the whole of all the inner casing walls.

According to this preferred embodiment, the plurality of wings are arranged rotationally symmetrically about the central axis of the whole formed by all the inner shell walls, and the supporting effect given to the outer shell wall and the inner shell walls by the wings is also arranged rotationally symmetrically about the central axis of the whole formed by all the inner shell walls, and the supporting effect on the outer shell wall and the inner shell walls is balanced, thereby further increasing the structural strength of the outer shell wall and the inner shell walls and protecting the outer shell wall and the inner shell walls.

Preferably, the inner wall of the inner casing wall is provided with a rib extending along the inner wall of the inner casing wall toward the opening of the insertion groove space.

According to the preferred scheme, the arrangement of the reinforcing ribs can increase the structural strength of the inner shell wall, prevent the inner shell wall from being inclined, deformed or damaged, protect the inner shell wall and keep the inner shell wall in the original state.

Preferably, the housing wall and the inner housing wall are integrally formed of resin, and the heat sink is made of one of metal, resin having a high thermal conductivity, and ceramic.

According to this preferred embodiment, the resin has excellent heat resistance and toughness, and the housing wall and the inner housing wall made of the resin can maintain their structural shapes and are not easily deformed. The metal or ceramic has excellent heat-conducting property, the heat radiator made of the metal or ceramic has better heat-conducting effect, the heat emitted by the main substrate of the lighting circuit can be quickly transferred out, and the heat-radiating effect is excellent. Meanwhile, the resin with higher heat conduction coefficient, such as the resin mixed with the heat conduction auxiliary agent, is used as the material of the radiator, and the insulation and heat radiation effects of the invention can also be realized.

Drawings

FIG. 1 is a schematic diagram of a housing and a heat sink according to the prior art;

FIG. 2 is an overall schematic view of a lighting device in an embodiment of the present invention;

fig. 3 is a schematic structural view of the housing, the heat sink, and the lighting circuit main substrate;

FIG. 4 is a schematic view of the lighting device of FIG. 2 taken along line A-A;

FIG. 5 is a schematic view of the housing of FIG. 2 taken along line A-A showing slot space;

fig. 6 is a schematic view of the housing of fig. 2 taken along line a-a showing the circuit space.

Description of reference numerals:

1. a lamp shade; 2. a light source; 3. a lighting circuit main substrate; 31. a main board; 32. a component; 33. a long component; 4. a housing; 41. a housing wall; 42. an inner housing wall; 43. a first groove; 44. a side wing; 45. reinforcing ribs; 45a, a first insertion hole; 5. a heat sink; 51. a heat dissipating wall; 52. a second groove; 53. a second insertion hole; 6. a chute; m, slot space; o, loop space.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. The structure and the like of the lighting device are schematically simplified and shown in the drawings.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The embodiment of the invention provides a lighting device, which is shown in fig. 2 and 3 and comprises a lampshade 1, a light source 2, a lighting circuit main substrate 3, a shell 4 and a heat sink 5, wherein the light source 2 is electrically connected with the lighting circuit main substrate 3. The lamp cover 1 cooperates with the housing 4 to cover the light source 2 therebetween, and the heat sink 5 cooperates with the housing 4 to cover the lighting circuit main substrate 3 therebetween. The lampshade 1 and the light source 2 are only schematically represented, the lampshade 1 can be spherical, rectangular parallelepiped or any other shape, and the light source 2 can be an incandescent lamp, a halogen lamp or an LED lamp.

Referring specifically to fig. 3, the housing 4 includes a housing wall 41 and an inner housing wall 42, the housing wall 41 is open at two ends, and the inner housing wall 42 is disposed inside the housing wall 41 in a manner that a slot space M (see fig. 5) is formed between the housing wall 41 and the inner housing wall 42. The heat sink 5 includes a heat dissipating wall 51, and the heat dissipating wall 51 can be inserted into the slot space M, so that a gap is left in the slot space M, and the heat can be dissipated through the reserved gap. The lighting circuit main board 3 is located inside the inner wall 42, and the inner wall 42 is provided to electrically insulate the lighting circuit main board 3.

The resin has heat resistance and excellent toughness, the housing wall 41 and the inner housing wall 42 are integrally formed by the resin, the structural shapes of the housing wall 41 and the inner housing wall 42 can be kept, and the housing 4 is not easy to deform in the using process. The heat-conducting property of metal or ceramic is excellent, the radiator 5 is made of one of metal, resin or ceramic, the heat-conducting effect of the radiator 5 is good, heat emitted by the lighting circuit main substrate 3 can be quickly transferred out, and the heat-radiating effect is excellent. Of course, the heat sink 5 may be made of a resin having a high thermal conductivity, for example, a resin mixed with a thermal conductive additive as a heat sink material, and the effects of insulation and heat dissipation of the present invention can be achieved.

In particular, in the present embodiment, as shown in fig. 3 and 4, the inner housing wall 42 is arc-shaped and is disposed inside the housing wall 41, wherein the housing wall 41, on which the inner housing wall 42 is not disposed, is partially formed as the first recess 43. Correspondingly, the heat dissipating wall 51 is arc-shaped with at least one open end, and the heat dissipating wall 51 is provided with a second groove 52, the heat dissipating wall 51 matches with the corresponding slot space M, and the second groove 52 matches with the corresponding first groove 43.

In the lighting device provided by the present embodiment, by the first recess 43 provided on the housing wall 41 of the housing 4 and the second recess 52 provided on the heat dissipation wall 51 of the heat sink 5, when the heat dissipation wall 51 is inserted into the slot space M formed between the housing wall 42 and the housing wall 41, the first recess 43 and the second recess 52 are matched and correspond to each other and are communicated with the space where the lighting circuit main substrate 3 is located, i.e., the internal space of the housing wall 42 to form the circuit space O (see fig. 6), so that the volume of the circuit space O is increased, and the size of the lighting circuit main substrate 3 can be correspondingly enlarged or the number of components 32 on the lighting circuit main substrate 3 can be increased to enhance the functions of the lighting device. The arrangement of the inner case wall 42 and the case wall 41 confines the lighting circuit main substrate 3 between the inner case walls 42, isolating it from the heat sink 5 and the outside, thereby ensuring electrical insulation of the lighting device.

To sum up, the heat dissipating wall 51 is inserted into the slot space M formed between the inner housing wall 42 and the housing wall 41, so as to ensure the heat dissipating performance, and the first groove 43 and the second groove 52 are correspondingly matched and communicated with the inner space of the inner housing wall 42 to expand and form the circuit space O, so as to ensure the heat dissipating performance, ensure the electrical insulation performance and expand the circuit space O, so as to meet the requirement of the size of the main substrate 3 of the lighting circuit or the electrical component, or to realize the miniaturization of the housing on the premise of the size of the main substrate 3 of the lighting circuit and the electrical component.

In addition, when the lampshade 1 and the light source 2 connected to the housing 4 are small, the housing 4 is easily exposed, which affects the tidiness and beauty of the appearance of the lighting device. In the embodiment, the miniaturized shell 4 can be perfectly shielded by the lampshade 1 and is not easy to expose outside, so that the appearance of the illuminating device is ensured to be neat and attractive while the illuminating device is miniaturized.

The inner wall 42 does not protrude from the housing wall 41, so that the connection between the housing 4 and the heat sink 5 is not affected by the arrangement of the inner wall 42. Meanwhile, the size of the opening of the slot space M is increased, so that the insertion of the heat dissipation wall 51 is facilitated, and the housing wall 41 can also play a role in guiding the insertion of the heat dissipation wall 51. The inner housing wall 42 is preferably coaxial with the housing wall 41 to facilitate insertion of the heat dissipating wall 51 into the socket space M formed between the inner housing wall 42 and the housing wall 41.

The shell wall 41 is in a circular truncated cone shape as a whole, the opening of the slot space M faces the lower bottom surface of the circular truncated cone of the shell wall 41, the heat sink 5 including the second groove 52 is in a circular truncated cone shape as a whole, and the opening of the heat sink wall 51 faces the upper bottom surface of the circular truncated cone of the heat sink 5. According to the preferred embodiment, the housing wall 41 is truncated cone-shaped, and the shape of the heat sink 5 matches the shape of the housing wall 41, so that the heat dissipation wall 51 of the heat sink 5 is inserted into the slot space M more closely and closely attached to the housing wall 41, and heat generated from the main substrate 3 of the lighting circuit conducted through the heat dissipation wall 51 is more easily dissipated while the heat is not easily slipped off. In addition, the heat generated in the lighting circuit main substrate 3 is radiated outward toward the opening of the socket space M, and in the process of the radiation, the cross-sectional area of the heat radiation wall 51 in the direction toward the opening of the socket space M is gradually increased, which is more advantageous for the rapid radiation of the heat, and the heat radiation performance of the lighting device is excellent. The volume of the housing wall 41 can be reduced while ensuring heat dissipation performance, and the housing 4 can be miniaturized while ensuring heat dissipation.

In other embodiments of the present invention, it is also possible to arrange that the diameter of the housing wall 41 gradually increases and the increasing width gradually becomes larger in the opening direction toward the slot space M. Compared to the circular truncated cone-shaped housing wall 41, the volume of the housing wall 41 can be reduced, and the size of the housing 4 can be further reduced.

Meanwhile, the inner housing wall 42 is cylindrical as a whole, which is beneficial to the production and processing of the inner housing wall 42 and is also convenient for inserting the heat dissipating wall 51 of the heat sink 5 into the slot space M. Of course, the entire inner casing wall 42 may be circular truncated cone-shaped, and the opening of the slot space M faces the circular truncated cone-shaped bottom surface of the inner casing wall 42. The whole of the inner casing wall 42 is in a circular truncated cone shape, and the opening of the slot space M faces the bottom surface of the circular truncated cone of the inner casing wall 42, so that the heat dissipation wall 51 can be effectively attached to or extrude the outer surface of the inner casing wall 42 after being inserted into the slot space M, the friction force between the heat sink 5 and the inner casing wall 42 is increased, the heat sink 5 and the inner casing wall 42 are not easy to slip, and heat dissipation is facilitated.

In the present invention, the upper bottom surface and the lower bottom surface are, with respect to the geometric shape of the circular truncated cone, the circular truncated cone upper bottom surface means a bottom surface with a smaller radius on the circular truncated cone, and the circular truncated cone lower bottom surface means a bottom surface with a larger radius on the circular truncated cone, and are not related to the orientation shown in the drawings.

The first grooves 43 are plural, the plural first grooves 43 are provided rotationally symmetrically around the central axis of the entirety formed by all the inner housing walls 42, and correspondingly, the plural second grooves 52 are provided rotationally symmetrically around the central axis of the entirety formed by all the heat dissipation walls 51. The plurality of first recesses 43 and the plurality of second recesses 52 are provided, so that the size of the circuit space O can be further increased, the edge of the lighting circuit main substrate 3 or other electrical components can be more easily arranged in the circuit space O, the circuit space O is expanded to the housing wall 41, the volume of the housing wall 4 can be reduced by reasonably using the circuit space O, the size of the housing wall 41 can be reduced, and the housing 4 can be further miniaturized. The plurality of first grooves 43 are arranged around the central axis of the whole body formed by all the inner shell walls 42 in a rotational symmetry manner, correspondingly, the plurality of second grooves 52 are arranged around the central axis of the whole body formed by all the heat dissipation walls 51 in a rotational symmetry manner, the heat dissipation walls 51 inserted into the slot space M are also arranged around the central axis of the whole body formed by all the inner shell walls 42 in a rotational symmetry manner, the heat dissipation walls 51 are uniformly distributed, the local excessive temperature rise is effectively avoided, the heat dissipation is uniform, and the heat dissipation effect can be ensured. The uniform distribution of the first grooves 43 and the second grooves 52 also facilitates the structural distribution of the housing 4 and the heat sink 5 to be even, and the stress distribution to be uniform, thereby ensuring the structural strength of the housing 4 and the heat sink 5.

The sum of the central angles corresponding to the openings of the first grooves 43 is 30 to 300 degrees, and more preferably, the sum of the central angles corresponding to the openings of the first grooves 43 is 115 to 125 degrees. So set up, can enough avoid can't effectively holding lighting circuit owner base plate 3 because of the too little and unable effective size that increases return circuit space O that sets up of first recess 43 and second recess 52, also can avoid leading to the heat radiating area of heat dissipation wall 51 too little because of the too big and unable effective heat dissipation of heat dissipation wall 51 that sets up of first recess 43 and second recess 52. In the present embodiment, there are two first recesses 43 and two second recesses 52, two first recesses 43 are disposed rotationally symmetrically with respect to the central axis of the whole formed by all the inner casing walls 42, two second recesses 52 are disposed rotationally symmetrically with respect to the central axis of the whole formed by all the heat dissipation walls 51, and the central angle corresponding to the opening of each of the first recesses 43 and the second recesses 52 is 60 °.

Of course, in other embodiments of the present invention, only one of the first recess 43 and the second recess 52 may be provided, so that the electrical component can be adapted to only pass through the inner housing wall 42 at one end, and the heat dissipation area of the heat dissipation wall 51 can be maximally ensured, thereby ensuring the heat dissipation effect of the heat dissipation wall 51.

A wing 44 is disposed between the inner casing wall 42 and the casing wall 41, and the wing 44, the inner casing wall 42 and the casing wall 41 enclose the slot space M. By providing the wings 44, the wings 44 have a supporting effect on the housing wall 41 and the inner housing wall 42, which can increase the structural strength of the housing wall 41 and the inner housing wall 42, prevent the housing wall 41 and the inner housing wall 42 from being skewed, deformed or damaged, and effectively protect the housing wall 41 and the inner housing wall 42. The plurality of wings 44 are disposed in rotational symmetry about the central axis of the entirety formed by all of the inner shell walls 42, the wings 44 provide support to the inner shell walls 42 in a manner that is also disposed in rotational symmetry about the central axis of the entirety formed by all of the inner shell walls 42, and the wings 44 provide even support to the inner shell walls 42, further increasing the structural strength of the inner shell walls 42 and protecting the inner shell walls 42.

In the preferred embodiment, the wings 44 may be integrally formed with the inner housing wall 42 to form the edges of the slot space M, which facilitates the injection molding process and increases the structural strength of the wings 44 and the inner housing wall 42.

In particular, the height of the side wing 44 is not higher than the height of the inner casing wall 42, and the side wing 44 does not protrude from the end surface of the inner casing wall 42, so that the insertion between the heat sink 5 and the casing 4 is not affected.

On the inner wall of the inner housing wall 42, ribs 45 are provided, which extend along the inner wall of the inner housing wall towards the opening of the socket space. The arrangement of the reinforcing ribs 45 can increase the structural strength of the inner casing wall 42, prevent the inner casing wall 42 from being inclined, deformed or damaged, protect the inner casing wall 42, and keep the inner casing wall 42 in the original state.

The rib 45 is provided with a first insertion hole 45a, the heat sink 5 is provided with a second insertion hole 53 corresponding to the first insertion hole 45a, and the heat sink 5 and the housing 4 are connected by a fastener (not shown) inserted into the second insertion hole 53 and the first insertion hole 45 a.

The first insertion hole 45a and the second insertion hole 53 and a fastening member (not shown) together constitute an alignment means when the heat sink 5 is inserted into the housing 4 and a positioning and fixing means after insertion. In the present embodiment, the first insertion hole 45a and the second insertion hole 53 and the fastening member (not shown) are exemplified, but the present invention is also applicable to the case where the fastening member is eliminated and either the first insertion hole 45a or the second insertion hole 53 is provided as an insert corresponding to the insertion hole, and the insertion hole may be a groove that is not completely closed but partially opened.

Preferably, the inner housing wall 42, the outer housing wall 41, the wings 44 and the ribs 45 are integrally formed.

Lighting circuit owner base plate 3 includes mainboard 31 and sets up components and parts 32 on mainboard 31, is provided with two spouts 6 on inner housing wall 42, and in two spouts 6 were inserted respectively to the both sides of mainboard 31, utilize spout 6 to inject mainboard 31 in inner housing wall 42, improve mainboard 31's stability.

By extending part of main board 31 of lighting circuit main board 3 out of inner housing wall 41 and accommodating it in first recess 43, the structure of housing 4 can be effectively utilized, circuit space O can be increased, and housing 4 can be further miniaturized. In general, the lighting circuit main substrate 3 is elongated on the surface of the opening of the slot space M, and the longer two end portions are accommodated in the first recess 43, so that the space between the inner casing wall 42 and the outer casing wall 41 is effectively utilized, and the size of the circuit space O is increased, thereby contributing to the miniaturization of the casing 4. Of course, the size of the main board 31 may be increased without changing the size of the housing wall 41, and the components 32 located on the main board 31 may be added, so that the functions of the lighting device may be expanded by using a plurality of components 32.

In the prior art, because the circuit space is limited, the horizontal installation of the long component exceeding the inner diameter of the inner casing wall 42 can not be carried out. In the embodiment of the present invention, the loop space O is enlarged at two ends, so that the long component 33 may be disposed on the main board 31, and two ends of the long component 33 are respectively located in the loop space O formed by the first groove.

It will be appreciated by those of ordinary skill in the art that in the embodiments described above, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be basically implemented without these technical details and various changes and modifications based on the above-described embodiments. Accordingly, in actual practice, various changes in form and detail may be made to the above-described embodiments without departing from the spirit and scope of the invention.

Claims

1. A lighting device including a case accommodating a lighting circuit main substrate and a heat sink, the case comprising:

the shell wall is provided with openings at two ends;

an inner shell wall arranged in an arc shape in the inner part of the shell wall in a form of a slot space formed between the inner shell wall and the shell wall, wherein the shell wall which is not provided with the inner shell wall partially forms a first groove;

the radiator comprises an arc-shaped radiating wall with at least one end opened and a second groove formed in the radiating wall, the radiating wall is matched and corresponding to the slot space, and the second groove is matched and corresponding to the first groove;

and a side wing is arranged between the inner shell wall and the shell wall, and the side wing, the inner shell wall and the shell wall enclose the slot space.

2. The lighting device according to claim 1, wherein the housing wall is generally frustoconical, the socket space opening toward a frustoconical lower bottom surface of the housing wall, the heat sink including the second groove portion is generally frustoconical, and the heat sink wall opening toward a frustoconical upper bottom surface of the heat sink.

3. A lighting device as recited in claim 2, wherein said inner housing wall is generally cylindrical or said inner housing wall is generally frustoconical, said socket space opening toward a frustoconical lower bottom surface of said inner housing wall.

4. A lighting device as recited in any one of claims 1-3, wherein said first plurality of grooves is disposed in rotational symmetry about a central axis of an entirety of all of said housing walls, and wherein said second plurality of grooves is disposed in rotational symmetry about a central axis of an entirety of all of said heat dissipation walls.

5. A lighting device as recited in claim 4, wherein the sum of central angles of the openings of said first recess is from 30 ° to 300 °.

6. A lighting device as recited in claim 5, wherein the sum of central angles of the openings of the first grooves is 115-125 °.

7. A lighting device as recited in claim 1, wherein said wings have a height which is no greater than a height of said inner housing wall.

8. A lighting device as recited in claim 1, wherein said plurality of side wings are disposed rotationally symmetrically about a central axis of an entirety formed by all of said housing walls.

9. A lighting device as recited in any one of claims 1-3, 5-6, and 7-8, wherein a stiffener is provided on an inner wall of the inner housing wall, the stiffener extending along the inner wall of the inner housing wall towards the opening of the socket space.

10. A lighting device as recited in any one of claims 1-3, 5-6 and 7-8, wherein said housing wall and said inner housing wall are integrally formed from resin, and said heat sink is formed from one of metal, resin having a high thermal conductivity, or ceramic.