Down lamp

Abstract

The down lamp comprises a lamp shell, an installation space and a light emitting window are formed in the lamp shell, an annular groove is formed in the inner wall of the lamp shell, the inner wall of the lamp shell has the effective inner diameter De, the annular groove has the effective inner diameter D1 perpendicular to the axis of the down lamp, and D1 is larger than De; the driving circuit board is mounted in the mounting space; the LED light source is mounted in the mounting space, and the LED light source is electrically connected with the driving circuit board; and the diffusion plate made of the elastic material comprises a plate body and an annular flange, the annular flange extends in the radial direction of the plate body and has the effective outer diameter D2, D1 is larger than or equal to D2, D2 is larger than De, the annular flange is fixedly clamped in the annular groove in an embedded mode, the diffusion plate is located on the light outlet window, and the plate body is arranged right opposite to the LED light source. According to the technical scheme, the problem that according to an existing down lamp, the purpose that the diffusion plate and the lamp shell cannot be detached is achieved in a gluing mode, and consequently the production cost of the down lamp is high is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of lighting equipment, and in particular, relates to a downlight. Background Art

[0002] In the related art, a downlight includes a lamp housing, a driving circuit board, an LED light source, a diffusion plate and other components. During assembly, the driving circuit board and the LED light source and other components are assembled into the lamp housing, and finally the diffusion plate is installed at the light exit window of the lamp housing, and the lamp housing is sealed by the diffusion plate. At present, in order to comply with the non-removable regulations, the downlights on the market use glue to seal the diffusion plate and the lamp housing. However, the gluing method not only requires the use of special gluing equipment, but also requires a special gluing process station, which requires full-time staff to operate, resulting in high equipment and labor costs for the production of downlights. Utility Model Content

[0003] The purpose of the present application is to provide a downlight, aiming to solve the problem that the current downlights are non-detachable by gluing between the diffusion plate and the lamp housing, resulting in high cost of producing the downlights.

[0004] To achieve the above purpose, the technical solution adopted in this application is: a downlight, comprising:

[0005] The lamp housing is formed with an installation space and a light exit window communicating with the installation space, an annular groove is provided on the inner wall of the lamp housing, the inner wall of the lamp housing has an effective inner diameter De, and the annular groove has an effective inner diameter D1 perpendicular to the axis of the downlight, and D1 is greater than De;

[0006] A driving circuit board is installed in the installation space;

[0007] An LED light source is installed in the installation space, and the LED light source is electrically connected to the driving circuit board;

[0008] A diffuser plate made of elastic material includes a plate body and an annular flange connected to the circumferential edge of the plate body, the annular flange extends radially along the plate body and has an effective outer diameter D2, wherein D1 is greater than or equal to D2, and D2 is greater than De, so that the annular flange is embedded and fixed in the annular groove, the diffuser plate is located at the light exit window, and the plate body is arranged opposite to the LED light source.

[0009] In some embodiments of the present application, the annular flange is a continuous closed loop; or, the annular flange includes a plurality of sub-flanges, the plurality of sub-flanges circumferentially surround the plate body, and two adjacent sub-flanges are spaced apart.

[0010] In some embodiments of the present application, the end surface of the annular flange away from the side wall of the plate body is set to be a conical surface, and the conical surface is inclined toward the plate body along the direction from the diffuser plate to the LED light source.

[0011] In some embodiments of the present application, the diffuser plate also includes an anti-dismantling enclosure, which is connected to the side of the plate body facing away from the LED light source. The anti-dismantling enclosure circumferentially surrounds the plate body, and when the annular flange is embedded and fixed in the annular groove, the outer wall of the anti-dismantling enclosure away from the plate body is abutted against the inner wall of the lamp housing.

[0012] In some embodiments of the present application, the side of the annular flange facing away from the LED light source is perpendicular to the axis of the downlight, and when the annular flange is embedded in the annular groove, the side of the annular flange facing away from the LED light source is in contact with the groove wall surface on both sides of the annular groove that is away from the LED light source.

[0013] In some embodiments of the present application, the diffuser plate is an integrally formed component.

[0014] In some embodiments of the present application, the annular groove is a continuous full circle.

[0015] In some embodiments of the present application, the lamp housing includes a first shell and a second shell that is hollow and has two through ends. The first shell is sleeved on the second shell. The first shell and the second shell form an installation space. The second shell forms a light emitting window. The second shell includes a connecting part and a cylindrical shell part connected to the connecting part. The connecting part is connected to the first shell, and an annular groove is arranged on the inner wall of the cylindrical shell part.

[0016] In some embodiments of the present application, the downlight also includes a reflective cup, the reflective cup is provided with a first connecting structure, the connecting portion is provided with a second connecting structure, the reflective cup passes through the connecting portion, the first connecting structure is connected to the second connecting structure, the reflective cup is located between the LED light source and the diffuser plate, the reflective cup has a first end and a second end, the opening of the first end is arranged opposite to the LED light source, and the second end is arranged opposite to the plate body, the inner wall surface of the reflective cup is arranged as a reflecting surface, and the light irradiated by the LED light source to the reflecting surface is reflected by the reflecting surface to the plate body.

[0017] In some embodiments of the present application, the diffuser plate further includes a mating protrusion, which is connected to the side of the plate body facing the LED light source, and the mating protrusion circumferentially surrounds the plate body. When the annular flange is embedded and fixed in the annular groove, the mating protrusion abuts against the second end.

[0018] This application has at least the following beneficial effects:

[0019] In the downlight provided in the present application, an annular groove is provided on the inner wall of the lamp housing, and the annular groove has an effective inner diameter D1 perpendicular to the axis of the downlight, and the inner wall of the lamp housing has an effective inner diameter De, and D1 is greater than De. In addition, the diffuser plate made of elastic material included in the downlight includes a plate body and an annular flange connected to the circumferential edge of the plate body, the annular flange extends along the radial direction of the plate body, and the annular flange has an effective outer diameter D2, wherein D1 is greater than D2, and D2 is greater than De. In this way, when the diffuser plate made of elastic material is installed on the lamp housing, the annular flange is fixed in the annular groove by being clamped, and since D2 is greater than De, the elastic annular flange is squeezed into the annular groove and then returns to its original state, then one of the groove walls on both sides of the annular groove that is away from the LED light source forms a barrier to the annular flange, and for the installed downlight, it is impossible to apply force to the diffuser plate from the inside to make the annular flange disengage from the annular groove, and the annular flange is difficult to disengage from the annular groove, that is, the diffuser plate as a whole is difficult to be disassembled and separated from the lamp housing, which meets the non-detachable regulatory requirements. Compared with the downlights in the related art that achieve the purpose of being non-removable by gluing between the diffuser plate and the lamp housing, the downlight provided in the present application can achieve the purpose of being non-removable by using a purely mechanical assembly structure in which an annular flange and an annular groove are mutually embedded between the diffuser plate and the lamp housing. There is no need for gluing, which not only saves the purchase of gluing equipment, but also saves full-time gluing staff, thereby greatly reducing the cost of producing downlights. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 The assembly structure of the downlight of the embodiment of the present application is shown in FIG. Figure 1 ;

[0022] Figure 2 The assembly structure of the downlight of the embodiment of the present application is shown in FIG. Figure 2 ;

[0023] Figure 3 for Figure 1 An exploded schematic diagram of a downlight is shown;

[0024] Figure 4 for Figure 2 An exploded schematic diagram of a downlight is shown;

[0025] Figure 5 A cross-sectional view of a downlight according to an embodiment of the present application Figure 1 ;

[0026] Figure 6 A cross-sectional view of a downlight according to an embodiment of the present application Figure 2 ;

[0027] Figure 7 for Figure 5 The enlarged schematic diagram of point A in the middle;

[0028] Figure 8 This is a schematic diagram of the structure of a diffusion plate used in a downlight according to an embodiment of the present application.

[0029] Among them, the reference numerals in the figures are:

[0030] 10. lamp housing; 11. installation space; 12. light exit window; 13. annular groove; 110. first housing; 120. second housing; 121. connecting portion; 122. barrel housing portion; 123. inclined transition portion; 124. face ring portion; 125. second connecting structure; 126. third connecting structure;

[0031] 20. Driving circuit board;

[0032] 30. LED light source;

[0033] 40. diffuser plate; 41. plate body; 42. annular flange; 420. sub-flange; 421. conical surface; 43. anti-tampering enclosure plate; 44. matching protrusion;

[0034] 50. reflective cup; 51. first end; 52. second end; 53. reflecting surface; 54. first connecting structure;

[0035] 61. Spring clip; 62. Cable; 63. Sealing element. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] like Figures 1 to 6 As shown, the downlight provided in the embodiment of the present application includes a lamp housing 10, a driving circuit board 20, an LED light source 30 and a diffuser plate 40 made of elastic material. The lamp housing 10 is formed with an installation space 11 and a light exit window 12 connected to the installation space 11. The inner wall of the lamp housing 10 is provided with an annular groove 13. The inner wall of the lamp housing 10 has an effective inner diameter De. The annular groove 13 has an effective inner diameter D1 perpendicular to the axis of the downlight, and D1 is greater than De. The driving circuit board 20 and the LED light source 30 are both installed in the installation space 11. The LED light source 30 is electrically connected to the driving circuit board 20, and the cable 62 electrically connected to the driving circuit board 20 passes through the lamp housing 10 to be electrically connected to the external circuit, and the cable 62 and the perforated hole wall of the lamp housing 10 are sealed by a seal 63. The diffuser plate 40 includes a plate body 41 and an annular flange 42 connected to the circumferential edge of the plate body 41, the annular flange 42 extends radially along the plate body 41 and has an effective outer diameter D2, wherein D1 is greater than or equal to D2, and D2 is greater than De, so that the annular flange 42 is embedded and fixed in the annular groove 13, and the embedded diffuser plate 40 is restricted by two opposite groove walls of the annular groove 13 and cannot move axially relative to the lamp housing 10 along the axial direction of the downlight. The diffuser plate 40 is located at the light exit window 12, and the plate body 41 is arranged opposite to the LED light source 30.

[0041] In the downlight provided in the present application, the inner wall of the lamp housing 10 is provided with an annular groove 13, the annular groove 13 has an effective inner diameter D1 perpendicular to the axis of the downlight, and the inner wall of the lamp housing 10 has an effective inner diameter De, D1 is greater than De. In addition, the diffuser plate 40 made of elastic material included in the downlight includes a plate body 41 and an annular flange 42 connected to the circumferential edge of the plate body 41, the annular flange 42 extends in the radial direction of the plate body 41, and the annular flange 42 has an effective outer diameter D2, wherein D1 is greater than D2, and D2 is greater than De. In this way, when the diffuser plate 40 made of elastic material is installed on the lamp housing 10, the annular flange 42 is embedded and fixed in the annular groove 13. Since D2 is greater than De, the elastic annular flange 42 is squeezed into the annular groove 13 and then returns to its original state. Then, one of the groove walls on both sides of the annular groove 13 that is away from the LED light source 30 forms a barrier to the annular flange 42. In addition, for the installed downlight, it is impossible to apply force to the diffuser plate 40 from the inside to make the annular flange 42 detach from the annular groove 13. The annular flange 42 is difficult to detach from the annular groove 13. In other words, the diffuser plate 40 as a whole is difficult to be disassembled and separated from the lamp housing 10, which meets the regulatory requirements of non-removability. Compared with the downlights in the related art that achieve the purpose of being non-removable by gluing between the diffuser plate and the lamp housing, the downlight provided in the present application adopts a purely mechanical assembly structure in which the annular flange 42 and the annular groove 13 are mutually engaged between the diffuser plate 40 and the lamp housing 10. The annular flange 42 of the diffuser plate 40 made of elastic material can be squeezed into the annular groove 13 from the outside of the lamp housing 10, but force cannot be applied to the diffuser plate 40 from the inside to make the annular flange 42 disengage from the annular groove 13, thereby achieving the purpose of being non-removable. There is no need for gluing, which not only saves the purchase of gluing equipment, but also saves full-time gluing staff, thereby greatly reducing the cost of producing downlights.

[0042] In the embodiment of the present application, the inner wall of the lamp housing 10 may be a cylindrical inner wall with the axis of the downlight as the central axis (i.e., the cross-sectional profile of the inner wall of the lamp housing 10 perpendicular to the axis of the downlight is a circle), or may be a regular prism-shaped inner wall with the axis of the downlight as the central axis (i.e., the cross-sectional profile of the inner wall of the lamp housing 10 perpendicular to the axis of the downlight is a regular polygon). When the inner wall of the lamp housing 10 is a cylindrical inner wall, the diameter of the inner wall of the lamp housing 10 is the effective inner diameter De; when the inner wall of the lamp housing 10 is a regular prism-shaped inner wall, the diameter of the inscribed circle of the regular polygon of the cross section of the inner wall of the lamp housing 10 is the effective inner diameter De. Preferably, the inner wall of the lamp housing 10 of the downlight is a cylindrical inner wall with the axis of the downlight as the central axis.

[0043] like Figure 3 and Figure 4As shown, the annular flange 42 of the diffuser plate 40 of the downlight is a continuous closed loop. The contour of the projection of the annular groove 13 provided on the inner wall of the lamp housing 10 along the axial direction of the downlight can be a circle or a regular polygon (in this case, the number of sides of the regular polygon projection of the annular groove 13 is the same as the number of sides of the regular polygon cross-section of the inner wall of the lamp housing 10). When the projection of the annular groove 13 is a complete circle, the diameter of the projection circle of the annular groove 13 is the effective inner diameter D1; when the projection of the annular groove 13 is a regular polygon, the diameter of the inscribed circle of the regular polygon projection is the effective inner diameter D1. Preferably, the contour of the projection of the annular groove 13 of the lamp housing 10 of the downlight along the axial direction of the downlight is a circle, that is, the annular groove 13 is a continuous complete circle, so that the annular groove 13 is easier to be processed and formed, thereby improving manufacturing efficiency.

[0044] In the embodiment of the present application, the outer circle contour of the projection of the annular flange 42 connected to the circumferential edge of the plate body 41 along the axial direction of the downlight can be a circle or a regular polygon (in this case, the number of sides of the regular polygon projection of the annular flange 42 is the same as the number of sides of the regular polygon cross section of the inner wall of the lamp housing 10). When the outer circle of the projection of the annular flange 42 is a complete circle, the diameter of the outer circle of the projection of the annular flange 42 is the effective outer diameter D2; when the outer circle of the projection of the annular flange 42 is a regular polygon, the diameter of the inscribed circle of the outer circle of the regular polygon projection of the annular flange 42 is the effective outer diameter D2. Preferably, in the downlight, the outer circle contour of the projection of the annular flange 42 along the axial direction of the downlight is a circle.

[0045] In order to facilitate and easily install the annular flange 42 into the annular groove 13, Figure 7 As shown, the end surface of the annular flange 42 away from the side wall of the plate body 41 is set as a conical surface 421, and the conical surface 421 is inclined from the direction from the diffuser plate 40 to the LED light source 30 toward the direction close to the plate body 41. In this way, the conical surface 421 of the annular flange 42 can facilitate the annular flange 42 to be wedged into the lamp housing 10 along the inner wall of the lamp housing 10. In addition, since each component of the diffuser plate 40 is made of elastic material, that is, the annular flange 42 has elastic properties, therefore, when the annular flange 42 is wedged into the inner wall of the lamp housing 10, an axial force along the axis of the downlight is applied to the diffuser plate 40, so that the annular flange 42 is elastically deformed by compression, so that the annular flange 42 slides along the inner wall of the lamp housing 10 until it slides into the annular groove 13, and then the annular flange 42 returns to its original state in the annular groove 13.

[0046] like Figures 5 to 7As shown, the diffuser plate 40 further includes an anti-tampering enclosure 43, which is connected to the side of the plate body 41 away from the LED light source 30, and circumferentially surrounds the plate body 41. When the annular flange 42 is fixed in the annular groove 13, the outer side wall of the anti-tampering enclosure 43 away from the plate body 41 abuts against the inner wall of the lamp housing 10. The anti-tampering enclosure 43 abuts against the inner wall of the lamp housing 10, thereby preventing a disassembly tool (such as a screwdriver) from extending into the gap between the annular flange 42 and the groove wall of the annular groove 13, thereby preventing the diffuser plate 40 from being disassembled from the outside of the downlight using a disassembly tool, thereby achieving the purpose of being non-removable.

[0047] In the downlight provided in the embodiment of the present application, the side of the annular flange 42 facing away from the LED light source 30 is perpendicular to the axis of the downlight, and when the annular flange 42 is inserted into the annular groove 13, the side of the annular flange 42 facing away from the LED light source 30 contacts the groove wall surface on the side of the groove wall surface of the annular groove 13 that is away from the LED light source 30. Further, the thickness of the annular flange 42 along the axis direction of the downlight is almost equal to the groove width of the annular groove 13 along the axis direction of the downlight, that is, when the annular flange 42 is inserted into the annular groove 13, the side surfaces of the annular flange 42 that are opposite to each other along the axis direction of the downlight contact the groove walls on the opposite sides of the annular groove 13 respectively. In this way, when the annular flange 42 is embedded and fixed in the annular groove 13, the diffuser plate 40 as a whole cannot move axially relative to the lamp housing 10 along the axial direction of the downlight, and because the anti-dismantling panel 43 is attached to the inner wall of the lamp housing 10, the diffuser plate 40 as a whole cannot move relative to the lamp housing 10 in a direction perpendicular to the axial direction of the downlight (that is, the diffuser plate 40 cannot move horizontally relative to the lamp housing 10), so that the diffuser plate 40 as a whole is relatively fixed to the lamp housing 10.

[0048] like Figures 1 to 6 As shown, the lamp housing 10 includes a first housing 110 and a second housing 120 which is hollow and has two through ends. The first housing 110 is sleeved on the second housing 120. The first housing 110 and the second housing 120 form an installation space 11, and the second housing 120 forms a light exit window 12. The lamp housing 10 adopts a split combined housing. The driving circuit board 20 and the LED light source 30 are first installed in the first housing 110, and then the second housing 120 is connected to the first housing 110. In this way, when installing the driving circuit board 20 and the LED light source 30, the length of the first housing 110 along the axis direction of the downlight is relatively short, and the installation tool (such as a screwdriver) can easily extend into the first housing 110, which is convenient and easy to operate, and the driving circuit board 20 and the LED light source 30 can be easily and quickly installed.

[0049] like Figures 3 to 6As shown, the second shell 120 includes a connecting portion 121, a cylindrical shell portion 122 connected to the connecting portion 121, an inclined transition portion 123 connected to the end of the cylindrical shell portion 122 away from the connecting portion 121, and a face ring portion 124 connected to the inclined transition portion 123 and connected to the end of the cylindrical shell portion 122 away from the cylindrical shell portion 122. The connecting portion 121 is locked to the first shell 110 by screws, an annular groove 13 is provided on the inner wall of the cylindrical shell portion 122, the inclined transition portion 123 surrounds and forms a light exit window 12, and the face ring portion 124 serves as an exposed surface when the downlight is installed in the reserved groove of the ceiling.

[0050] like Figures 3 to 7 As shown, the downlight further includes a reflector cup 50, the reflector cup 50 is provided with a first connection structure 54, the connection portion 121 is provided with a second connection structure 125, the reflector cup 50 passes through the connection portion 121, the first connection structure 54 is connected to the second connection structure 125, so that the reflector cup 50 is connected to the second housing 120. Among them, the first connection structure 54 is a plurality of grooves provided on the reflector cup 50, and the second connection structure 125 is a plurality of protrusions provided on the connection portion 121 corresponding to the plurality of grooves one by one. When the reflector cup 50 passes through the connection portion 121, the protrusions are inserted into the grooves, so that the reflector cup 50 is connected to the second housing 120. The reflective cup 50 is located between the LED light source 30 and the diffuser plate 40. The reflective cup 50 has a first end 51 and a second end 52. The opening of the first end 51 is arranged opposite to the LED light source 30, and the second end 52 is arranged opposite to the plate body 41. The inner wall surface of the reflective cup 50 is arranged as a reflecting surface 53. The light irradiated by the LED light source 30 to the reflecting surface 53 is reflected by the reflecting surface 53 to the plate body 41.

[0051] In order to ensure that the reflective cup 50 can be stably mounted on the second housing 120, the reflective cup 50 will not shake relative to the second housing 120. Figures 5 to 7 As shown, the diffuser plate 40 further includes a matching protrusion 44, which is connected to the side of the plate body 41 facing the LED light source 30, and the matching protrusion 44 circumferentially surrounds the plate body 41. When the annular flange 42 is fixedly engaged in the annular groove 13, the matching protrusion 44 abuts against the second end 52. In this way, the matching protrusion 44 and the second connecting structure 125 clamp the reflector cup 50 stably, so that the reflector cup 50 can be stably installed on the second housing 120, and the reflector cup 50 will not shake relative to the second housing 120.

[0052] Preferably, the diffuser plate 40 is an integrally formed component. Specifically, the diffuser plate 40 is integrally formed by injection molding, which has high molding efficiency and good batch molding consistency.

[0053] like Figures 1 to 6As shown, the outer wall of the first housing 110 is provided with a plurality of third connection structures 126 evenly distributed in the circumferential direction, and the downlight further comprises a plurality of spring clips 61 connected one by one to the third connection structures 126. Generally, the downlight comprises two spring clips 61, and when the downlight is installed to the reserved groove of the ceiling, the two spring clips 61 apply elastic force outward, thereby clamping the entire downlight in the reserved groove.

[0054] In the downlights provided in other embodiments of the present application, Figure 8 As shown, the annular flange 42 includes a plurality of sub-flanges 420, and the plurality of sub-flanges 420 circumferentially surround the plate body 41, and two adjacent sub-flanges 420 are spaced apart. In this way, when the annular flange 42 of the diffuser plate 40 is pressed into the annular groove 13, the plurality of circumferentially spaced sub-flanges 420 are more likely to undergo elastic deformation than the annular flange 42 which is a continuous closed loop, so that the annular flange 42 as a whole is more easily pressed into the annular groove 13, so that the press-in installation can be completed easily and quickly, and the assembly efficiency is improved. In this embodiment, except that the above structure is different from the downlight provided in the above embodiment, the rest of the structures are the same, and will not be described here.

[0055] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A downlight, characterized in that: include: A lamp housing (10) is formed with an installation space (11) and a light exit window (12) connected to the installation space (11); an inner wall of the lamp housing (10) is provided with an annular groove (13); the inner wall of the lamp housing (10) has an effective inner diameter De; the annular groove (13) has an effective inner diameter D1 perpendicular to the axis of the downlight; D1 is greater than De; A driving circuit board (20) is installed in the installation space (11); An LED light source (30) is installed in the installation space (11), and the LED light source (30) is electrically connected to the driving circuit board (20); A diffuser plate (40) made of elastic material comprises a plate body (41) and an annular flange (42) connected to the circumferential edge of the plate body (41), wherein the annular flange (42) extends radially along the plate body (41) and has an effective outer diameter D2, wherein D1 is greater than or equal to D2, and D2 is greater than De, so that the annular flange (42) is embedded and fixed in the annular groove (13), the diffuser plate (40) is located at the light exit window (12), and the plate body (41) is arranged opposite to the LED light source (30).

2. The downlight according to claim 1, characterized in that: The annular flange (42) is a continuous closed loop; Alternatively, the annular flange (42) includes a plurality of sub-flanges (420), the plurality of sub-flanges (420) circumferentially surround the plate body (41), and two adjacent sub-flanges (420) are arranged at intervals.

3. The downlight according to claim 2, characterized in that: The end surface of the annular flange (42) away from the side wall of the plate body (41) is arranged as a conical surface (421), and the conical surface (421) is inclined in a direction from the diffusion plate (40) to the LED light source (30) toward a direction close to the plate body (41).

4. The downlight according to claim 3, characterized in that: The diffusion plate (40) further comprises an anti-disassembly enclosure (43), wherein the anti-disassembly enclosure (43) is connected to a side of the plate body (41) facing away from the LED light source (30), and the anti-disassembly enclosure (43) circumferentially surrounds the plate body (41). When the annular flange (42) is embedded and fixed in the annular groove (13), the anti-disassembly enclosure (43) is away from the outer wall of the plate body (41) and abuts against the inner wall of the lamp housing (10).

5. The downlight according to claim 4, characterized in that: The side surface of the annular flange (42) facing away from the LED light source (30) is perpendicular to the axis of the downlight, and when the annular flange (42) is embedded in the annular groove (13), the side surface of the annular flange (42) facing away from the LED light source (30) contacts the groove wall surface on one side of the groove wall surface of the annular groove (13) that is away from the LED light source (30).

6. The downlight according to any one of claims 1 to 5, characterized in that: The diffusion plate (40) is an integrally formed component.

7. The downlight according to claim 6, characterized in that: The annular groove (13) is a continuous complete circle.

8. The downlight according to claim 7, characterized in that: The lamp housing (10) comprises a first shell (110) and a second shell (120) which is hollow and has two through ends; the first shell (110) is sleeved on the second shell (120); the first shell (110) and the second shell (120) form the installation space (11); the second shell (120) forms the light exit window (12); the second shell (120) comprises a connecting portion (121) and a cylindrical shell portion (122) connected to the connecting portion (121); the connecting portion (121) is connected to the first shell (110); and the annular groove (13) is provided on the inner wall of the cylindrical shell portion (122).

9. The downlight according to claim 8, characterized in that: The downlight further comprises a reflector cup (50), the reflector cup (50) being provided with a first connection structure (54), the connection portion (121) being provided with a second connection structure (125), the reflector cup (50) passing through the connection portion (121), the first connection structure (54) being connected to the second connection structure (125), the reflector cup (50) being located between the LED light source (30) and the diffuser plate (40), the reflector cup (50) having a first end (51) and a second end (52), the opening of the first end (51) being arranged opposite to the LED light source (30), the second end (52) being arranged opposite to the plate body (41), the inner wall surface of the reflector cup (50) being arranged as a reflection surface (53), the light irradiated by the LED light source (30) to the reflection surface (53) being reflected by the reflection surface (53) to the plate body (41).

10. The downlight according to claim 9, characterized in that: The diffuser plate (40) further comprises a mating protrusion (44), wherein the mating protrusion (44) is connected to a side of the plate body (41) facing the LED light source (30), and the mating protrusion (44) circumferentially surrounds the plate body (41). When the annular flange (42) is embedded and fixed in the annular groove (13), the mating protrusion (44) abuts against the second end (52).

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