CN212132134U

CN212132134U - Down lamp

Info

Publication number: CN212132134U
Application number: CN202020550342.1U
Authority: CN
Inventors: 官世富; 余远彬; 陈鑫钊; 魏明丽
Original assignee: Zhangzhou Lidaxin Optoelectronic Technology Co ltd
Current assignee: Zhangzhou Lidaxin Optoelectronic Technology Co ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-12-11
Anticipated expiration: 2030-04-14
Also published as: EP3896333A1; EP3896333B1

Abstract

The utility model belongs to the technical field of lighting apparatus, especially, relate to a down lamp. The down lamp includes: the light source structure comprises a light source plate and lamp beads, wherein the light source plate is provided with a light-emitting surface for the lamp beads to be arranged and a heat-conducting surface opposite to the light-emitting surface; and a heat radiation structure for fixing the light source structure and radiating the light source structure, the heat radiation structure comprises a heat radiation surface ring and a heat conduction radiation plate, the heat radiation surface ring is provided with an arrangement cavity which is an opening cavity structure and is used for the heat conduction radiation plate to be arranged, the light source structure is connected to the heat conduction radiation plate through the heat conduction surface and projects light outwards through the opening of the arrangement cavity, the heat conduction radiation plate receives heat at the heat conduction surface and radiates the received heat to the inner wall of the arrangement cavity, and the light source plate and the heat conduction radiation plate are arranged in a non-contact manner with the inner wall of the arrangement cavity. The utility model discloses can effectively dispel the heat to the light source structure to when the down lamp catches fire, can delay the damage of light source board.

Description

Down lamp

Technical Field

The utility model belongs to the technical field of lighting apparatus, especially, relate to a down lamp.

Background

The LED fire-proof down lamp is widely applied to hotels, meeting rooms, factory offices, houses, institutions, schools, hospitals and places needing energy conservation and high color rendering indexes.

At present, the light source plate of the fireproof down lamp on the market is generally attached to the heat dissipation part behind the lamp, in order to enable light rays emitted by the light source plate to be projected from the front of the lamp, the front of the hardware surface ring needs to be provided with light transmission holes, so that the light source plate is exposed, and the back of the light source plate is covered with fireproof cotton.

However, the light holes are formed in the hardware surface ring, which is not beneficial to fire prevention of the light source plate; covering the fireproof cotton on the light source plate is not favorable for the heat dissipation of the light source plate. And because light source board and heat dissipation piece directly set up on five metals face ring, when catching fire, the five metals face ring temperature that metal material made rises fast to make heat conduct to the light source board rapidly, and damage the light source board.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of this application provides a down lamp, aims at solving present light source board and radiating piece lug connection, can not delay the problem that the light source board damaged when leading to the down lamp to catch fire.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: provided is a downlight, comprising:

the light source structure comprises a light source plate and lamp beads, wherein the light source plate is provided with a light emergent surface for the lamp beads to be arranged and a heat conducting surface opposite to the light emergent surface; and

the heat radiation structure comprises a heat radiation surface ring and a heat conduction radiation plate, wherein the heat radiation surface ring is provided with a placement cavity for accommodating the heat conduction radiation plate and provided with an opening, the light source plate is connected to the heat conduction radiation plate through the heat conduction surface and projects light outwards through the opening of the placement cavity, and gaps are reserved between the light source plate and the heat conduction radiation plate and the inner wall of the placement cavity.

In one embodiment, the surface of the heat-conducting radiation plate connected with the heat-conducting surface completely covers the heat-conducting surface, the bottom of the installation cavity, the heat-conducting radiation plate and the light source plate are sequentially arranged along the light ray, and the heat-conducting radiation plate is arranged at an interval relative to the bottom of the installation cavity.

In one embodiment, the down lamp further comprises a driving structure which is connected with the radiating surface ring and used for driving the light source structure, a connecting hole is formed in the bottom of the cavity of the mounting cavity, the connecting hole penetrates through the outer space of the mounting cavity, the radiating structure further comprises a connecting column which penetrates through the connecting hole, one end of the connecting column is connected with the heat conduction radiating plate, and the other end of the connecting column is connected with the driving structure.

In one embodiment, the driving structure includes a driving box connected to the connecting column, and a driving board disposed in the driving box and electrically connected to the light source board.

In one embodiment, the down lamp further comprises a wiring structure, the wiring structure comprises a wiring terminal electrically connected with the driving board and a wiring cover connected with the driving box, the wiring cover and the driving box surround to form a wiring cavity for accommodating the wiring terminal, and the wiring cover is provided with a wiring groove communicated with the wiring cavity and allowing a wire to pass through; the wiring structure further comprises a first toothed plate and a second toothed plate, wherein the first toothed plate is located in the wiring cavity and connected with the driving box, the second toothed plate is located in the wiring cavity and connected with the wiring cover, a plurality of sawteeth are respectively formed in the first toothed plate and the second toothed plate, and the sawteeth of the first toothed plate are matched with the sawteeth of the second toothed plate and clamp the wires.

In one embodiment, the wiring structure further includes two side plates connected to the driving box, two ends of the first toothed plate are connected to the two side plates respectively, the wiring structure further includes an adjusting toothed plate stacked on the first toothed plate, provided with the saw teeth and located between the first toothed plate and the second toothed plate, and two ends of the adjusting toothed plate are detachably connected to the two side plates respectively.

In one embodiment, the light source structure further includes a reflective cup located in the placement cavity, the reflective cup is disposed opposite to the light emitting surface and includes a cup sleeve sleeved in the placement cavity and a cup body located in the cup sleeve and integrally formed with the cup sleeve, and a sealing ring is further disposed between the cup sleeve and the cavity wall of the placement cavity.

In one embodiment, the cup body is provided with a switching groove, and the down lamp further comprises a switching switch which is arranged in the switching groove and used for controlling the lamp bead and a sealing cover which is used for sealing the switching groove.

In one embodiment, a clamping groove is formed in the side surface of the cup sleeve, the clamping groove is arranged along the circumferential extension of the cup sleeve, a guide groove which is communicated with the outer end face of the cup sleeve is formed in the groove wall of the clamping groove, the down lamp further comprises a decorative ring which is located at the opening of the placement cavity and covers the cup sleeve, and a buckling pin of which one end is connected with the decorative ring, the other end of the buckling pin is inserted into the clamping groove along the guide groove and is buckled with the groove wall of the clamping groove along the circumferential rotation preset radian of the cup sleeve.

In one embodiment, the heat dissipation surface ring comprises a heat dissipation cylinder and a heat dissipation ring, the heat dissipation cylinder is provided with the arrangement cavity, the heat dissipation ring is located at the opening of the arrangement cavity and connected with the heat dissipation cylinder, the decoration ring and the heat dissipation ring are arranged in a stacked mode, and a sealing gasket is arranged on the ring surface of the heat dissipation ring, which deviates from the decoration ring.

The beneficial effect of this application lies in: paste on the heat conduction face of light source board through with heat conduction radiation board to the heat that makes lamp pearl and light source board produce conducts to heat conduction radiation board through the heat conduction face, and heat radiation board again is with the inner wall in received heat thermal radiation to settling the chamber, and gives off the heat through the cooling surface ring. Heat conduction radiant panel and light source board all are located the cooling surface intra-annular, therefore need not to encircle at the cooling surface trompil, be favorable to the fire prevention of down lamp, and need not to use the cotton cover of fire prevention, the heat can be dispelled through the cooling surface ring, be favorable to the heat dissipation of down lamp, furthermore, heat conduction radiant panel and light source board all set up with the inner wall non-contact who settles the chamber, certain clearance has promptly, after the cooling surface ring catches fire, the heat of cooling surface ring can not transmit to the light source board rapidly, avoid the light source board to be damaged rapidly.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic front view of a down lamp provided in an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of the downlight of FIG. 1 along the light exit direction;

FIG. 3 is a schematic perspective view of the reflector cup of FIG. 2;

FIG. 4 is an exploded schematic view of one embodiment of the downlight of FIG. 1;

FIG. 5 is an exploded view of another embodiment of the downlight of FIG. 1;

FIG. 6 is an exploded schematic view of a further embodiment of the downlight of FIG. 1;

FIG. 7 is a bottom view of the downlight of FIG. 1;

FIG. 8 is a top plan view of the downlight of FIG. 1;

fig. 9 is a front view of a further embodiment of the downlight of fig. 1.

Wherein, in the figures, the respective reference numerals:

100. a down lamp; 10. a heat dissipation structure; 11. a heat dissipating surface ring; 111. a heat-dissipating cylinder; 112. a heat dissipation ring; 12. a heat conductive radiation plate; 13. connecting columns; 14. a seal ring; 113. a placement cavity; 51. a spring support; 53. an insulating layer; 54. a decorative ring; 20. a light source structure; 21. a light source plate; 22. a lamp bead; 23. a light reflecting cup; 231. a cup body; 232. a cup sleeve; 55. buckling legs; 30. a drive structure; 31. a drive cartridge; 311. a lower sleeve cover; 312. covering the sleeve; 32. a drive plate; 33. a drive chamber; 40. a wiring structure; 41. a wiring cover; 42. a wiring terminal; 45. a wiring groove; 57. switching a slot; 233. a card slot; 234. a guide groove; 43. a second toothed plate; 44. adjusting the toothed plate; 49. a first toothed plate; 46. a side plate; 58. a switch; 59. a sealing cover; 56. a gasket; 131. connecting holes; 24. a connecting bolt; 52. a spring; 211. a light-emitting surface; 212. a heat conducting surface.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description 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 considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 and 3, an embodiment of the present disclosure provides a down lamp 100, which includes a light source structure 20 and a heat dissipation structure 10. The light source structure 20 includes a light source board 21 and a lamp bead 22. Optionally, the lamp beads 22 are electrically connected with the light source board 21, and the lamp beads 22 are LED lamp beads 22 and are provided with a plurality of. The LED lamp bead 22 has the characteristics of high lighting speed, high brightness, energy conservation, environmental protection and the like. Referring to fig. 4 and 6, the light source plate 21 has a light emitting surface 211 for the light bead 22 to be disposed and a heat conducting surface 212 disposed opposite to the light emitting surface 211. The heat generated by each lamp bead 22 in the lit state is transferred to the light source panel 21. The heat dissipation structure 10 is used for fixing the light source structure 20 and dissipating heat of the light source structure 20, and the heat dissipation structure 10 includes a heat dissipation surface ring 11 and a heat conduction radiation plate 12. Optionally, the heat dissipating surface ring 11 is made of a hardware material and has a melting point greater than 900 °, and the heat conducting and radiating plate 12 is made of metal aluminum, where the aluminum has good heat conducting performance and is abundant in resources. The heat dissipation surface ring 11 is provided with a placement cavity 113, the placement cavity 113 has an opening, the light source structure 20 is located the placement cavity 113, the lamp bead 22 emits light outwards through the opening of the placement cavity 113 in an electrically conductive state and generates heat, the light source plate 21 is connected with the heat conduction radiation plate 12 through the heat conduction surface 212, the heat conduction radiation plate 12 is located the placement cavity 113 and has a gap with the inner wall of the placement cavity 113, namely, the light source plate 21 and the heat conduction radiation plate 12 are both arranged in a non-contact manner with the inner wall of the placement cavity 113, and the heat conduction radiation plate 12 receives heat from the heat conduction surface 212 and radiates the received heat to the inner wall of the placement cavity 113.

Through pasting heat conduction radiation plate 12 on the heat conduction face 212 of light source board 21 to the heat that makes lamp pearl 22 and light source board 21 produce conducts to heat conduction radiation plate 12 through heat conduction face 212, and heat conduction radiation plate 12 again with the heat radiation of receiving to the inner wall of settling chamber 113, and give off the heat through cooling surface ring 11. Heat conduction radiation plate 12 and light source board 21 all are located cooling surface ring 11, therefore need not to go up the trompil at cooling surface ring 11, be favorable to the fire prevention of down lamp 100, and need not to use the cotton cover of fire prevention, the heat can be scattered through cooling surface ring 11, be favorable to the heat dissipation of down lamp 100, furthermore, heat conduction radiation plate 12 and light source board 21 all set up with the inner wall non-contact who settles chamber 113, certain clearance has promptly, after cooling surface ring 11 catches fire, cooling surface ring 11's heat can not transmit to light source board 21 rapidly, avoid light source board 21 to be damaged rapidly.

Referring to fig. 4 and fig. 6, in one embodiment, the plate surface of the heat conduction and radiation plate 12 connected to the light source plate 21 completely covers the heat conduction surface 212, that is, the heat conduction surface 212 is completely located on the heat conduction and radiation plate 12, so that heat can be rapidly conducted to the heat conduction and radiation plate 12. The bottom of the accommodating cavity 113, the heat conducting radiation plate 12 and the light source plate 21 are sequentially arranged along the emergent direction of light, the heat conducting radiation plate 12 is arranged in parallel with the bottom of the accommodating cavity 113 and is arranged at intervals, and optionally, the distance between the heat conducting radiation plate 12 and the bottom of the accommodating cavity 113 is 5mm in the embodiment.

In one embodiment, the down lamp 100 further includes a driving structure 30 connected to the heat dissipating surface ring 11 and used for driving the light source structure 20, a connecting hole 131 penetrating through the external space is formed at the bottom of the accommodating cavity 113, the heat dissipating structure 10 further includes a connecting column 13 penetrating through the connecting hole 131, one end of the connecting column 13 is connected to the heat conducting and radiating plate 12, and the other end of the connecting column 13 is connected to the driving structure 30. The connecting holes 131 are arranged in a plurality of spaced-apart positions, and the number of the connecting columns 13 is matched with the number of the connecting holes 131 and is arranged in a one-to-one correspondence manner. The connecting threaded holes are opened on the end face of the connecting column 13 at one end of the mounting cavity 113, and the through holes are opened at the positions of the light source plate 21 and the heat conduction radiation plate 12 corresponding to the threaded holes, so that the light source plate 21 and the heat conduction radiation plate 12 are connected to the connecting columns 13 through the connecting bolts 24.

In one embodiment, the driving structure 30 includes a driving box 31 connected to the connecting column 13 and a driving board 32 disposed in the driving box 31 and electrically connected to the light source board 21. The driving box 31 comprises a lower cover 311 connected with the connecting column 13 and an upper cover 312 sleeved with the lower cover 311, the lower cover 311 is inserted into the upper cover 312 and surrounds to form a driving cavity 33, and the driving plate 32 is located in the driving cavity 33 and is installed on the lower cover 311. Further, two buckle structures are arranged at intervals along the insertion direction of the lower cover 311, and both the two buckle structures are used for connecting the lower cover 311 and the upper cover 312 in a buckle manner, so that the lower cover 311 and the upper cover 312 are clamped by double-layer buckles, and the drive box 31 is prevented from being easily detached.

Referring to fig. 7 and 9, in an embodiment, the downlight 100 further includes a wiring structure 40, the wiring structure 40 includes a wiring terminal 42 electrically connected to the driving board 32 and a wiring cover 41 having one end hinged to the upper cover 312, and the other end of the wiring cover 41 is connected to the upper cover 312 in a snap-fit manner. The wiring cover 41 and the upper cover 312 surround to form a wiring cavity for accommodating the wiring terminal 42, the wiring cover 41 is provided with a wiring slot 45 for communicating the wiring cavity and allowing a wire to pass through, and the wire is used for connecting the wiring terminal 42 and a power supply. The wiring structure 40 further includes a first toothed plate 49 located in the wiring cavity and connected to the driving box 31 and a second toothed plate 43 located in the wiring cavity and connected to the wiring cover 41, a plurality of saw teeth are respectively disposed on the first toothed plate 49 and the second toothed plate 43, and the saw teeth of the first toothed plate 49 are matched with the saw teeth of the second toothed plate 43 and clamp the wires. The wire is clamped between the first toothed plate 49 and the second toothed plate 43, thereby forming a labyrinth trace and increasing the pressure on the wire to form an overpull force.

In one embodiment, the wiring structure 40 further includes two side plates 46 connected to the driving box 31, two ends of the first toothed plate 49 are connected to the two side plates 46, respectively, the wiring structure 40 further includes an adjusting toothed plate 44 stacked on the first toothed plate 49 and provided with saw teeth and located between the first toothed plate 49 and the second toothed plate 43, and two ends of the adjusting toothed plate 44 are detachably connected to the two side plates 46, respectively. The adjusting toothed plate 44 is used for adjusting a gap between the first toothed plate 49 and the second toothed plate 43, and specifically, when the clamped wire is thinner, the adjusting toothed plate 44 is installed to reduce the gap between the first toothed plate 49 and the second toothed plate 43, so that the adjusting toothed plate 44 and the second toothed plate 43 are matched and clamp the wire; on the contrary, when the wire is thicker, the adjusting toothed plate 44 is disassembled, and the first toothed plate 49 and the second toothed plate 43 directly clamp the wire.

In an embodiment, the light source structure 20 further includes a reflective cup 23 located in the disposing cavity 113, the reflective cup 23 is disposed opposite to the light emitting surface 211 and includes a cup sleeve 232 sleeved in the disposing cavity 113 and a cup body 231 located in the cup sleeve 232 and integrally formed with the cup sleeve 232, the cup body 231 is configured to collect light generated by the lamp bead 22, and a sealing ring 14 is further disposed between the cup sleeve 232 and the wall of the disposing cavity 113. The sealing ring 14 can be made of soft materials such as silica gel, silica gel and the like, and the sealing ring 14 is used for sealing a gap between the cup sleeve 232 and the wall of the accommodating cavity 113, so that the waterproof performance of the down lamp 100 is improved, and the sealing and waterproof effects are achieved.

Referring to fig. 1 and fig. 3, optionally, in this embodiment, the light reflecting cup 23 is a lens, the lamp bead 22 is disposed at the center of the light source board 21, and the lamp bead 22 is just located at the center of the lens after the down lamp 100 is assembled, which is beneficial to light distribution.

In one embodiment, the cup 231 defines a switching groove 57, and the downlight 100 further includes a switch 58 disposed in the switching groove 57 and used for controlling the lamp bead 22, and a sealing cover 59 for sealing the switching groove 57. The switch 58 can be used to change functions, so as to switch various functions of the down lamp 100, including dimming, color or power adjustment, and the sealing cover 59 is used to seal the switching groove 57, so that the switch 58 has a waterproof function.

In one embodiment, the side surface of the cup sleeve 232 is further provided with a clamping groove 233, the extending direction of the clamping groove 233 is arranged along the circumferential direction of the cup sleeve 232, the groove wall of the clamping groove 233 is further provided with a guide groove 234 penetrating to the outer end surface of the cup sleeve 232, the down lamp 100 further comprises a decorative ring 54 located at the opening of the mounting cavity 113 and covering the cup sleeve 232 and a fastening pin 55 with one end connected with the decorative ring 54, and the other end of the fastening pin 55 is inserted into the clamping groove 233 along the guide groove 234 and rotates by a predetermined radian along the circumferential direction of the cup sleeve 232 to fasten the groove wall of the clamping groove 233. Alternatively, the decorative ring 54 is made of plastic and is surface nickel plated and brushed, and various colors can be made, such as: sub-white, bright white, and sub-black to match the color of other components of the downlight 100. The decoration ring 54 is buckled to the reflection of light cup 23, and need not to go up the trompil at the cooling surface ring 11, and bare-handed alright dismantle the decoration ring 54 from the reflection of light cup 23, conveniently switch different decoration rings 54, satisfy consumer's demand, improve customer experience.

Referring to fig. 5 and 7, it can be understood that at least two fastening pins 55 are symmetrically arranged, and the number of the locking slots 233 and the number of the guiding slots 234 are adapted to the number of the fastening pins 55.

In one embodiment, the heat dissipating surface ring 11 includes a heat dissipating cylinder 111 having a mounting cavity 113 and a heat dissipating ring 112 located at an opening of the mounting cavity 113 and connected to the heat dissipating cylinder 111, the decorative ring 54 and the heat dissipating ring 112 are stacked, and a sealing gasket 56 is further disposed on a surface of the heat dissipating ring 112 away from the decorative ring 54. Optionally, the heat dissipating ring 112 is inevitably deformed during the processing, when the heat dissipating ring 112 is mounted on the ceiling, a gap is easily formed between the heat dissipating ring 112 and the ceiling, which is not beautiful, and the sealing gasket 56 made of soft material is disposed in front of the ceiling and the heat dissipating ring 112, which not only seals the gap, but also plays a role in covering the ugly, and simultaneously plays a role in sealing and waterproofing, and also prevents the heat in the room from being exhausted from the gap, thereby causing energy waste.

In one embodiment, the heat sink ring 11 is further provided with two spring supports 51 on the surface thereof connected to the driving structure 30, the spring supports 51 are connected to the heat sink ring 11 by butt welding, and the springs 52 are disposed on both the spring supports 51. The spring 52 is wrapped by an insulating layer 53 made of an insulating material, so that the problem that the down lamp 100 is extinguished after the down lamp 100 is extinguished, due to residual current or static electricity remaining on the spring 52, can be prevented.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims

1. A downlight, comprising:

2. A downlight according to claim 1, wherein: the heat conduction radiation plate is connected with the plate surface of the heat conduction surface and completely covers the heat conduction surface, the cavity bottom of the placement cavity, the heat conduction radiation plate and the light source plate are sequentially arranged along the light, and the heat conduction radiation plate is arranged at intervals relative to the cavity bottom of the placement cavity.

3. A downlight according to claim 1, wherein: the down lamp is still including connecting the cooling surface ring is used for the drive structure of light source structure, the connecting hole has been seted up at the end of settling the chamber, the connecting hole link up extremely settle the exterior space in chamber, heat radiation structure is still including wearing to establish the spliced pole of connecting hole, the one end of spliced pole is connected the heat conduction radiation plate, the other end of spliced pole is connected the drive structure.

4. A downlight according to claim 3, wherein: the driving structure comprises a driving box connected with the connecting column and a driving plate arranged in the driving box and electrically connected with the light source plate.

5. A downlight according to claim 4, wherein: the down lamp also comprises a wiring structure, the wiring structure comprises a wiring terminal electrically connected with the drive plate and a wiring cover connected with the drive box, the wiring cover and the drive box surround to form a wiring cavity for accommodating the wiring terminal, and the wiring cover is provided with a wiring groove communicated with the wiring cavity and used for a wire to pass through; the wiring structure further comprises a first toothed plate and a second toothed plate, wherein the first toothed plate is located in the wiring cavity and connected with the driving box, the second toothed plate is located in the wiring cavity and connected with the wiring cover, a plurality of sawteeth are respectively formed in the first toothed plate and the second toothed plate, and the sawteeth of the first toothed plate are matched with the sawteeth of the second toothed plate and clamp the wires.

6. A downlight according to claim 5, wherein: wiring structure still including all connecting the both sides board of drive box, two are connected respectively at the both ends of first pinion rack the curb plate, wiring structure still include with first pinion rack range upon range of setting and seted up the sawtooth just is located first pinion rack with the regulation pinion rack between the second pinion rack, the both ends of adjusting the pinion rack can be dismantled respectively and connect two the curb plate.

7. A downlight according to claim 1, wherein: the light source structure further comprises a reflection cup located in the placement cavity, the reflection cup is opposite to the light emitting surface and comprises a cup sleeve and a cup body, the cup sleeve is sleeved in the placement cavity, the cup body is located in the cup sleeve and integrally formed with the cup sleeve, and a sealing ring is further arranged between the cup sleeve and the wall of the placement cavity.

8. A downlight according to claim 7, wherein: the cup has been seted up and has been switched over the groove, down lamp still including set up in switch over the inslot and be used for control the change over switch of lamp pearl, and be used for sealing switch over the sealed lid in groove.

9. A downlight according to claim 7, wherein: the draw-in groove has been seted up to the side surface of glass holder, the draw-in groove is followed the circumference of glass holder extends the setting, the cell wall of draw-in groove has been seted up and has been switched on to the guide way of the outer terminal surface of glass holder, down lamp is still including being located settle the opening part in chamber and cover the rosette of glass holder to and one end is connected the foot of detaining of rosette, the other end of detaining the foot is followed the guide way inserts the draw-in groove, and follow the predetermined radian of circumferential direction and the lock joint of glass holder the cell wall of draw-in groove.

10. A downlight according to claim 9, wherein: the heat dissipation surface ring comprises a heat dissipation cylinder and a heat dissipation ring, the heat dissipation cylinder is provided with the arrangement cavity, the heat dissipation ring is located at the opening of the arrangement cavity and connected with the heat dissipation cylinder, the decoration ring is stacked with the heat dissipation ring, and the heat dissipation ring deviates from the annular surface of the decoration ring and is provided with a sealing gasket.