GB2583781A

GB2583781A - Downlight

Info

Publication number: GB2583781A
Application number: GB1909627.0A
Authority: GB
Inventors: Guan Shifu; Yu Yuanbin; Li Wanzhen; Yang Junsong
Original assignee: Xiamen Eco Lighting Co Ltd
Current assignee: Xiamen Eco Lighting Co Ltd
Priority date: 2019-05-10
Filing date: 2019-07-04
Publication date: 2020-11-11
Anticipated expiration: 2039-07-04
Also published as: GB2583781B; GB201909627D0

Abstract

A downlight comprises a light source assembly 10, a heat sink assembly 20and a gasket 14. The light source assembly 10 has a light source plate 11 with a plurality of LEDs. The light source plate 11 has a light-emitting surface and a heat sink surface disposed opposite to the light-emitting surface. The heat sink assembly 20 dissipates heat from the light source assembly and includes a heat sink cylinder 21 and an annular heat sink plate 22 connected to the heat sink cylinder 21. The heat sink cylinder 21 has an accommodating cavity 211 having an opening, and the light source plate 11 is located within the accommodating cavity. The gasket 14 is located between the light source plate 11 and the bottom of the accommodating cavity to transfer the heat from the light source assembly 10 to the heat sink cylinder 21. The configuration improves the heat dissipation efficiency of the light source assembly and simplifies the assembly process.

Description

DOWNLIGHT

TECHNICAL FIELD

The present application relates to the technical field of fireproof illumination, and more particularly to a downlight.

BACKGROUND

At present, LED fireproof downlights are widely used in buildings and places that require energy saving and high color rendering index, such as, hotels, conference rooms, factory offices, business negotiation places, homes, institutions, schools, hospitals, etc. Internal heat dissipation of the fireproof downlight is achieved by directly assembling the light source assembly on a annular heat sink plate, so that heat can be transferred from the light source assembly to the annular heat sink plate, and the heat is dissipated outwards through the annular heat sink plate. The light source assembly is directly disposed on the annular heat sink plate, and a surface contact between the two for heat transferring is insufficient, thereby affecting the heat dissipation efficiency. A thermally conductive silica gel can also be coated between the light source assembly and the annular heat sink plate, but the uniformity of the thermally conductive silica gel coating is not guaranteed, and the application of the thermally conductive silica gel may result in a complicated assembly process of the fireproof downlight.

SUMMARY

An object of the present application is to provide a downlight, in order to solve the problem of improving the heat sink efficiency and to simplify the assembling process.

The present application provides a downlight, including: a light source assembly, comprising a light source plate and a plurality of lamp beads; wherein the light source plate is provided with a light-emitting surface and a heat sink surface disposed opposite to the light-emitting surface, and the lamp beads are arranged spaced apart at the light-emitting surface and configured to emit light in a preset direction; a heat sink assembly, configured to dissipate heat from the light source assembly, wherein the heat sink assembly comprises a heat sink cylinder and an annular heat sink plate connected to the heat sink cylinder, the heat sink cylinder is provided with an accommodating cavity having an opening, and the light source plate is located within the accommodating cavity and the heat sink is configured to face a bottom of the accommodating cavity; and a gasket, located between the light source plate and the bottom of the accommodating cavity, wherein the heat sink surface abuts against a side of the gasket to transfer heat to the gasket, and the other side of the gasket is connected to the bottom of the accommodating cavity to transfer the heat to the heat sink cylinder.

In an embodiment, an outer diameter of the gasket is larger than an outer diameter of the light source plate, and the gasket covers the bottom of the accommodating cavity.

In an embodiment, the gasket is made of a flexible, thermally conductive, and electrically insulating material.

In an embodiment, the light source assembly further comprises a reflective cup disposed on the light-emitting surface, and the reflective cup comprises a sleeve sleeved in the accommodating cavity and a cup body located in the sleeve and integrally formed with the sleeve, the cup body is configured for collecting light generated by the lamp beads, and a sealing ring is arranged between the sleeve and a wall of the accommodating cavity.

In an embodiment, a side surface of the annular heat sink plate away from an emitting direction of the light is provided with a foam ring plate.

In an embodiment, the downlight further comprises a drive base connected with the heat sink cylinder, the drive base is provided with a mounting surface configured for mounting the heat sink cylinder, and the bottom of the accommodating cavity is located between the gasket and the mounting surface.

In an embodiment, the downlight further comprises a connecting assembly configured to connect the heat sink cylinder and the drive base, the connecting assembly comprises a plurality of connecting bolts and a plurality of connecting posts protruding from the mounting surface and spaced apart, and each of the connecting posts is provided with a threaded hole configured to adapt to the connecting bolt, the positions of the gasket, the bottom of the accommodating cavity and the light source plate corresponding to the connecting posts are provided with through holes, and an end of each of the connecting bolts is respectively inserted into the corresponding through hole and screwed into the corresponding threaded hole.

In an embodiment, the connecting assembly further comprises a positioning posts protruding from the mounting surface and disposed deviated from the connecting posts, a number of the connecting post is provided with at least two, the positions of the gasket, the bottom of the accommodating cavity and the light source plate corresponding to the positioning posts are provided with positioning holes, and a free end of each of the positioning posts respectively passes through the positioning hole.

In an embodiment, the drive base is provided with a receiving cavity, the receiving cavity is provided with a drive assembly therein configured to drive the light source assembly, a wire guide tube is arranged between the heat sink cylinder and the drive base, and two ends of the wire guide tube respectively communicate to the accommodating cavity and the receiving cavity.

In an embodiment, the receiving cavity is provided with an opening, and the opening of the receiving cavity faces away from the opening of the accommodating cavity, the opening of the receiving cavity is provided with a drive lid integrally connected with a drive sleeve sleeved on the drive base, an outside surface of the drive base is protruded with a plurality of buckles, and inside walls of the drive sleeve corresponds to each of the buckles is provided with slots configured for engaged with the buckles.

In an embodiment, the drive lid is provided with a conductive hole communicated to the receiving cavity, the downlight further comprises: a power wire having an end passing through the conductive hole and electrically connected to the drive assembly, and a wire clip located in the conductive hole and configured to fix the power wire; and the downlight further comprises a power box connected to the other end of the power wire.

The technical benefits of the present application lie in that the light source assembly is disposed in the heat dissipation cylinder, and the lamp beads emit light towards the preset direction and the light source plate simultaneously generates a heat during the conductive state of the light source assembly. The gasket made of thermally conductive and insulating material is disposed between the heat sink surface and the bottom of the accommodating cavity, such that the heat is transferred from the light source plate to the gasket and then transferred to the heat dissipation cylinder via the gasket. Since the gasket can ensure the uniformity of the thermally conductive surface, and the gasket can fully and effectively contact with the light source plate and the heat dissipation cylinder, respectively, and the gasket is easy to disassemble and assemble, thereby the heat sink efficiency of the light source assembly is improved and the assembling process of the downlight is simplified.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a perspective structural view of a downlight provided according to the present application; Figure 2 is an explosion view of an embodiment of a light source assembly and a heat sink assembly of the downlight according to figure 1; Figure 3 is a perspective structural view of a gasket according to figure 2; Figure 4 is a assembling structural view of the light source assembly and the heat sink assembly of the downlight according to figure 1; Figure 5 is a front view of the downlight according to figure 1; Figure 6 is a cross-sectional view of the downlight along its central symmetry plane according to figure 5; Figure 7 is a front view of the downlight in another direction according to figure 5; Figure 8 is a bottom view of the downlight according to figure 7; Figure 9 is a top view of the downlight according to figure 7; Figure 10 an explosion view of anther embodiment of a light source assembly and a heat sink assembly of the downlight according to figure 1; Figure 11 is a perspective structural view of heat sink assembly according to figure 10. In the drawings, the reference numbers are listed: 100-downlight; 10-light source assembly; 20-heat sink assembly; 31-drive sleeve; 61-spring clip; 66-connecting plate; 131-sleeve; 132-cup body; 13-reflective cup; 12-sealing ring; 11-light source plate; 41-connecting bolt; 211-accommodating cavity; 213-light passing hole; 21-heat sink cylinder; 22-annular heat sink plate; 14-gasket; 33-wire guide tube; 322-mounting surface; 34-connecting post; 35-positioning post; 321-buckle; 32-drive base; 38-drive assembly; 15-foam ring plate; 52-wire clip; 51-power wire; 111-light-emitting surface; 142-positioning hole; 141-through hole; 37-drive lid; 324-receiving cavity; 53-power box.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Herein, embodiments of the present application are described in detail, and examples of the embodiment are illustrated in the accompanying figures; wherein, an always unchanged reference number or similar reference numbers represent(s) identical or similar components or components having identical or similar functionalities. The embodiment described below with reference to the accompanying figures is illustrative and intended to illustrate the present application, but should not be considered as any limitation to the present application.

In the description of the present application, it needs to be understood that, directions or location relationships indicated by terms such as "length", "width", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and so on are the directions or location relationships shown in the accompanying figures, which are only intended to describe the present application conveniently and simplify the description, but not to indicate or imply that an indicated device or component must have specific locations or be constructed and manipulated according to specific locations; therefore, these terms shouldn't be considered as any limitation to the present application.

In the present application, unless there is additional explicit stipulation and limitation, terms such as "mount", "connect with each other", "connect", "fix", and so on should be generalizedly interpreted, for example, "connect" can be interpreted as being fixedly connected, detachably connected, or connected integrally; "connect" can also be interpreted as being mechanically connected or electrically connected; "connect" can be further interpreted as being directly connected or indirectly connected through intermediary, or being internal communication between two components or an interaction relationship between the two components. For the one of ordinary skill in the art, the specific meanings of the aforementioned terms in the present application can be interpreted according to specific conditions.

Please refer to figure 1 to figure 3, embodiments of the present application provides a downlight 100. The downlight 100 plugs into an external power source and is configured to emit light in a preset direction.

Please refer to figures 2, 4 to 6, the downlight 100 includes: a light source assembly 10, a heat sink assembly 20, and a gasket 14. The light source assembly 10 includes a light source plate 11 and a plurality of lamp beads and configured to generate heat in a conductive state. Optionally, the lamp bead is an LED lamp bead, and the LED lamp bead has the characteristics of fast lighting speed, high brightness, energy saving and environmental protection. The light source plate 11 is configured to mount the lamp beads and supply power to the lamp beads, and the heat generated by each of the lamp beads in the lighting state is transferred to the light source plate 11. The light source plate 11 is provided with a light-emitting surface 111 and a heat sink surface disposed opposite to the light-emitting surface 111, and the lamp beads are arranged spaced apart at the light-emitting surface 111 and configured to emit light in a preset direction. The heat sink assembly 20 is configured to dissipate heat from the light source assembly 10 and to fix the light source assembly 10. The heat sink assembly 20 includes a heat sink cylinder 21 and a annular heat sink plate 22 connected to the heat sink cylinder 21, the heat sink cylinder 21 is provided with an accommodating cavity 211 having an opening, and the opening of the heat sink cylinder 21 is connected to the inner ring of the annular heat sink plate 22. Optionally, the heat sink cylinder 21 is integrally formed with the annular heat sink plate 22. The light source plate 11 is located with the bottom of the accommodating cavity 211 with the heat sink surface facing the accommodating cavity 211, and the light emitted by the lamp bead is emitted from the opening of the accommodating cavity 211 toward the preset direction. The gasket 14 is made of a thermally conductive material and has insulativity, and the gasket 14 is integrally formed to ensure uniformity of the surface. The gasket 14 is disposed between the light source plate 11 and the bottom of the accommodating cavity 211, and the heat dissipation surface abuts the one side of the gasket 14 to transfer heat to the gasket 14, and the other side of the gasket 14 can abut the bottom of the accommodating cavity 211 to transfer the received heat to the heat sink cylinder 21. In addition, the gasket 14 can also be spaced from the bottom of the accommodating cavity 211 to conduct heat to the heat sink cylinder 21 through other connection structures.

The light source assembly 10 is disposed in the heat dissipation cylinder 21, and the lamp beads emit light towards the predetermined direction and the light source plate simultaneously generates heat during the conductive state of the light source assembly 10. The gasket 14 made of thermally conductive and insulating material is disposed between the heat sink surface and the bottom of the accommodating cavity 211, such that the heat is transferred from the light source plate 11 to the gasket 14 and then transferred to the heat dissipation cylinder 21 via the gasket 14. Since the gasket 14 can ensure the uniformity of the thermally conductive surface, and the gasket 14 can fully and effectively contact with the light source plate 11 and the heat dissipation cylinder 21, respectively, and the gasket 14 is easy to disassemble and assemble, thereby the heat sink efficiency of the light source assembly 10 is improved and the assembling process of the downlight is simplified.

In an embodiment, the inner diameter of the gasket 14 is greater than the inner diameter of the light source plate 11, and the gasket 14 covers the bottom of the accumulating cavity 211. The gasket 14 is arranged flat on the bottom of the accumulating cavity 211 and fills the entire bottom of the accumulating cavity 211, thereby the contact area between the gasket 14 and the heat sink cylinder 21 is increased, and the heat sink efficiency is improved.

In an embodiment, the gasket 14 is made of a flexible, thermally conductive, and electrically insulating material. Optionally, the thermally conductive material may be thermally conductive silicone or thermally conductive cotton, and the flexible gasket 14 can be in sufficient contact with the heat sink surface and the bottom of the accommodating cavity 211 to allow heat to be quickly transferred from the light source assembly 10 to the heat sink cylinder 21. Optionally, the gasket 14 made of flexible material can also isolate the light source plate 11 and the bottom of the accommodating cavity 211, and can also slow the vibration of the light source plate 11.

In an embodiment, thermal conductivity coefficient of the gasket 14 is in a range of 0.2 to 1.

Please refer to figures 6-9, in an embodiment, the light source assembly 10 further includes a cup-shaped reflective cup 13 and a sealing ring 12 located in the accommodating cavity 211. The reflective cup 13 is disposed on the light-emitting surface 111 and includes a sleeve 131 sleeved in the accommodating cavity 211 and a cup body 132 disposed in the sleeve 131 and integrally formed with the sleeve 131, the cup body 132 is configured for collecting light generated by the lamp beads, and control the emitting of the light beam to illuminate intensively; and the beam emitted can be adjusted to be comfortable, and the light-emitting efficiency can be improved. In other embodiments, the cup body 132 can also be a lens. Referring to figures 2 and 6, the sealing ring 12 is sleeved on the sleeve 131 and configured to seal the sleeve 131 and the cavity wall of the accommodating cavity 211, such that preventing water and external foreign matter from coming into contact with the light source plate 11, thereby providing waterproof effect and improving the product applicable places to improve product competitiveness.

In an embodiment, a side surface of the annular heat sink plate 22 away from the direction of emitting of the light is provided with a foam ring plate 15. The foam ring plate 15 generates smoke when it burns, thereby prompting the fire information to the user. Optionally, the heat sink assembly 20 is made of flame retardant material to prevent further burning of the flame. The heat sink assembly 20 also includes two connecting plates 66 that connect the side surfaces of the heat sink cylinder 21 and two spring clips 61 that connect the two connecting plates 66, respectively.

Please refer to figures 2 and 3, in an embodiment, the downlight 100 further includes a drive base 32 connected to the heat sink cylinder 21, the drive base 32 being cylindrical and having a mounting surface 322 for the heat sink cylinder 21 to be contacted with. The bottom of the accommodating cavity 211 is located between the gasket 14 and the mounting surface 322. The downlight 100 also includes a connecting assembly configured for connecting the heat sink cylinder 21 and the drive base 32. The connecting assembly includes a plurality of connecting bolts 41 and a plurality of connecting posts 34 protruding from the mounting surface 322 and spaced apart. Optionally, the number of the connecting posts 34 and the connecting bolts 41 is each provided with three, and three connecting posts 34 are circumferentially arranged symmetrically on the mounting surface 322. Each of the connecting posts 34 is provided with a threaded hole adapted to the connecting bolt 41, the positions of the gasket 14, the bottom of the accommodating cavity 211 and the light source plate 11 corresponding to the connecting posts 34 are provided with through holes 141, and an end of each of the connecting bolts 41 is respectively inserted into the corresponding through hole 141 and screwed into the corresponding threaded hole. The light source assembly 10 and the heat sink assembly 20 can be detachably fixed to the drive base 32 by the cooperation of the connecting bolt 41 and the threaded hole.

In an embodiment, the connecting assembly further includes positioning posts 35 protruding from the mounting surface 322 and deviated from the connecting posts 34, and the number of the positioning post 35 is provided with at least two, the positions of the gasket 14, the bottom of the accommodating cavity 211 and the light source plate 11 corresponding to the positioning posts 35 are provided with positioning holes 142, and a free end of each of the positioning posts 35 respectively passes thi-ough the positioning hole 142. During the assembly of the downlight 100, the cooperation of the positioning post 35 and the positioning hole 142 can be used to assist in the assembly between the light source assembly 10, the heat sink assembly 20 and the drive base 32.

Please refer to figures 5-9, in an embodiment, the drive base 32 is provided with a receiving cavity 324, and the downlight 100 further includes a drive assembly 38 disposed in the receiving cavity 324 and configured for driving the light source assembly 10, the downlight 100 further includes a wire guide tube 33 configured for the wire to pass through, the wire guide tube 33 is disposed between the heat sink cylinder 21 and the drive base 32, and two ends of the wire guide tube 33 respectively communicate to the accommodating cavity 211 and the receiving cavity 324. The wires are configured to connect the light source plate 11 and the drive assembly 38 such that the drive assembly 38 controls the lighting and closing of the lamp beads.

In an embodiment, the receiving cavity 324 is provided with an opening, the opening of the receiving cavity 324 facing away from the opening of the accommodating cavity 211, and the downlight 100 further includes a drive lid 37 covered on the opening of the receiving cavity 324, and a drive sleeve 31 integrally formed with the drive lid 37 and sleeved on the drive base 32, and the outside surface of the drive base 32 is protruded with a plurality of buckles 321, and inside walls of the drive sleeve 31 corresponds to each of the buckles 321 is provided with slots configured for engaged with the buckles 321. The cooperation of the buckle 321 and the slot allows the drive sleeve 31 to be detachably connected to the drive base 32 and the drive lid 37 to cover the receiving cavity 324.

In an embodiment, the drive lid 37 is provided with a conductive hole communicated with the receiving cavity 324. The downlight 100 further includes a power wire 51 having an end passing through the conductive hole and electrically connected to the drive assembly 38, and a wire clip 52 located in the conductive hole and configured to fix the power wire 51; The other end of the power wire 51 is electrically connected to the power box 53. The power assembly 53 can be powered by the power box 53.

In another embodiment of the present application, referring to figures 10-11, the downlight includes a light source assembly 10, a heat sink assembly 20, and a drive base 32. The light source assembly 10 generates heat in a conductive state and includes a light source plate 11 and a plurality of lamp beads. The light source plate 11 is provided with a light-emitting surface 111, and the lamp beads are arranged spaced apart at the light-emitting surface 111 and configured to emit light in a preset direction. Optionally, the lamp bead is an LED lamp bead, and the LED lamp bead has the characteristics of fast lighting speed, high brightness, energy saving and environmental protection. The light source plate 11 is configured to supply power to the lamp beads, and the heat generated by each of the lamp beads in the lighting state is transferred to the light source plate 11. The light source plate 11 is provided with a light-emitting surface 111 and a heat sink surface disposed opposite to the light-emitting surface 111. The heat sink assembly 20 is configured to dissipate heat from the light source assembly, and the heat sink assembly 20 includes a heat sink cylinder 21 and a annular heat sink plate 22 connected to an end of the heat sink cylinder 21, the heat sink cylinder 21 is provided with an accommodating cavity 211 having an opening, and the bottom of the accommodating cavity 211 is provided with light passing holes 213, and the opening of the heat sink cylinder 21 is connected to the inner ring of the annular heat sink plate 22. Optionally, the heat sink cylinder 21 is integrally formed with the annular heat sink plate 22. The drive base 32 is connected to the other end of the heat sink cylinder 21, and the light source plate 11 is located between the heat sink cylinder 21 and the drive base 32. the light-emitting surface 111 abuts the outer surface of the bottom of the accommodating cavity 211. The lamp beads emit light into the accumulating cavity 211 through the light passing holes 213. The drive base 32 has a cylindrical shape and is connected to the end surface of the other end of the heat sink cylinder 21.

The light source plate 11 is disposed outside the accommodating cavity 211, and the light source plate 11 is located between the heat sink cylinder 21 and the drive base 32, thereby facilitating the wiring of the light source plate 11 and the convenience of assembling the downlight 100 is improved; in addition, the light passing hole 213 is disposed at the bottom of the accommodating cavity 211, the weight of the heat sink assembly 20 and the material cost can be reduced as for the larger downlight 100.

In the present embodiment, optionally, the outer edge portion of the light source plate 11 abuts against the edge of the light passing hole 213. By abutting the outer edge portion of the light source plate 11 with the edge of the light passing hole 213, the heat of the light source plate 11 can be transferred to the heat sink cylinder 21 and dissipated through the heat sink cylinder 21.

In the present embodiment, optionally, the outer edge portion of the light source plate 11 is spaced apart from the edge of the light passing hole 213, and other connecting members between the spaced light source plate 11 and the edge of the light passing hole 213 may be disposed to connect the heat sink cylinder 21 and the light source plate 11 The above embodiments are merely preferred embodiments of the present application, and the scope of the present application is not limited thereto, and any insubstantial changes and substitutions made by those skilled in the art based on the present application belong to the scope of protection required in present application.

Claims

What is claimed is: 1. A downlight (100), comprising: a light source assembly (10), comprising a light source plate (11) and a plurality of lamp beads; wherein the light source plate (11) is provided with a light-emitting surface and a heat sink surface disposed opposite to the light-emitting surface, and the lamp beads are arranged spaced apart at the light-emitting surface and configured to emit light in a preset direction; a heat sink assembly (20), configured to dissipate heat from the light source assembly (10), wherein the heat sink assembly (20) comprises a heat sink cylinder (21) and an annular heat sink plate (22) connected to the heat sink cylinder (21), the heat sink cylinder (21) is provided with an accommodating cavity (211) having an opening, and the light source plate (11) is located within the accommodating cavity (211) and the heat sink is configured to face a bottom of the accommodating cavity (211); and a gasket (14), located between the light source plate (11) and the bottom of the accommodating cavity (211), wherein the heat sink surface abuts against a side of the gasket (14) to transfer heat to the gasket (14), and the other side of the gasket (14) is connected to the bottom of the accommodating cavity (211) to transfer the heat to the heat sink cylinder (21).
2. The downlight (100) of claim 1, wherein an outer diameter of the gasket (14) is larger than an outer diameter of the light source plate (11), and the gasket (14) covers the bottom of the accommodating cavity (211).
3. The downlight (100) of claim 1, wherein the gasket (14) is made of a flexible, thermally conductive, and electrically insulating material.
4. The downlight (100) of claim 1, wherein a thermal conductivity coefficient of the gasket (14) is in a range of 0.2 to 1.
5. The downlight (100) of any one of claims 1 to 4, wherein the light source assembly (10) further comprises a reflective cup (13) disposed on the light-emitting surface, and the reflective cup (13) comprises a sleeve (131) sleeved in the accommodating cavity (211) and a cup body (132) located in the sleeve (131) and integrally formed with the sleeve (131), the cup body (132) is configured for collecting light generated by the lamp beads, and a sealing ring (12) is arranged between the sleeve (131) and a wall of the accommodating cavity (211).
6. The downlight (100) of any one of claims 1 to 4, wherein a side surface of the annular heat sink plate (22) away from an emitting direction of the light is provided with a sealing ring (15).
7. The downlight 000) of any one of claims 1 to 4, wherein the downlight (100) further comprises a drive base (32) connected with the heat sink cylinder (21), the drive base (32) is provided with a mounting surface (322) configured for mounting the heat sink cylinder (21), and the bottom of the accommodating cavity (211) is located between the gasket (14) and the mounting surface (322).
8. The downlight (100) of claim 7, wherein the downlight (100) further comprises a connecting assembly configured to connect the heat sink cylinder (21) and the drive base (32), the connecting assembly comprises a plurality of connecting bolts and a plurality of connecting posts (34) protruding from the mounting surface (322) and spaced apart, and each of the connecting posts (34) is provided with a threaded hole configured to adapt to the connecting bolt, positions of the gasket (14), the bottom of the accommodating cavity (211) and the light source plate (11) corresponding to the connecting posts (34) are provided with through holes (141), and an end of each of the connecting bolts is respectively inserted into the corresponding through hole and screwed into the corresponding threaded hole.
9. The downlight (100) of claim 8, wherein the connecting assembly further comprises positioning posts (35) protruding from the mounting surface (322) and disposed deviated from the connecting posts (34), at least two connecting post are provided, the positions of the gasket (14), the bottom of the accommodating cavity (211) and the light source plate (II) corresponding to the positioning posts (35) are provided with positioning holes (142), and a free end of each of the positioning posts (35) respectively passes through the positioning hole (142).
10. The downlight (100) of claim 8, wherein the drive base (32) is provided with a receiving cavity (324), the receiving cavity (324) is provided with a drive assembly (38) therein configured to drive the light source assembly (10), a wire guide tube (33) is arranged between the heat sink cylinder (21) and the drive base (32), and two ends of the wire guide tube (33) respectively communicate to the accommodating cavity (211) and the receiving cavity (324).
11. The downlight (100) of claim 9, wherein the receiving cavity (324) is provided with an opening, and the opening of the receiving cavity (324) faces away from the opening of the accommodating cavity (211), the opening of the receiving cavity (324) is provided with a drive lid (37) integrally connected with a drive sleeve (31) sleeved on the drive base (32), an outside surface of the drive base (32) is protruded with a plurality of buckles (321), and inside walls of the drive sleeve (31) corresponds to each of the buckles (321) is provided with slots configured for engaged with the buckles (321).
12. The downlight (100) of claim 10, wherein the drive lid (37) is provided with a conductive hole communicating to the receiving cavity (324), the downlight (100) further comprises: a power wire (51) having an end passing through the conductive hole and electrically connected to the drive assembly (38), and a wire clip (52) located in the conductive hole and configured to fix the power wire (51); and the downlight (100) further comprises a power box (53) connected to the other end of the power wire (51).