Ceiling lamp, rear cover of ceiling lamp and lighting system

Abstract

The utility model provides a ceiling lamp and a rear cover and an illuminating system thereof, the rear cover is provided with a water collecting tank and a drainage tank, the water collecting tank is recessed from the top of the rear cover to the inside of the rear cover in the height direction of the rear cover, the inlet end of the drainage tank is communicated with the water collecting tank, and the outlet end of the drainage tank extends to the peripheral wall of the rear cover. The ceiling lamp is provided with the rear cover, the lighting system is provided with the ceiling lamp, the rear cover can guide and drain water dripping on the rear cover, and therefore the situation that a power module and a light source module of the ceiling lamp are damaged due to water immersion is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lamps, in particular to a rear cover of a ceiling lamp, a ceiling lamp provided with the rear cover, and a lighting system provided with the ceiling lamp. Background Art

[0002] Ceiling lights are mostly used in factories, workshops, stations, docks, warehouses, exhibition halls, shopping malls or other places that need lighting. Figure 1 As shown, an existing type of ceiling lamp 9 includes a lamp body 91, a rear cover 92, a connecting bracket 93, a power module, a light source module, etc.; the rear cover 92 is installed at the tail of the lamp body 91, and a receiving cavity is formed between the rear cover 92 and the lamp body 91, wherein the top of the rear cover 92 is provided with a first air vent 921 and a wire hole 922 connected to the receiving cavity; the connecting bracket 93 is installed on the rear cover 92, and the connecting bracket 93 is used to connect with an external connecting component 90 (such as a connecting lamp pole); the power module is arranged in the receiving cavity, and the heat generated by the power module can be dissipated through the first air vent 921, and the power supply cable connected to the power module can pass through the wire hole 922 into the receiving cavity and be electrically connected to the power module; the light source module is arranged in the lamp cavity of the lamp body 91, and the light source module is electrically connected to the power module, so that the power module can provide stable power supply to the light source module and enable the light source module to illuminate according to the set mode. The above-mentioned ceiling lamp 9 has the following deficiencies when in use:

[0003] Since the top of the rear cover 92 is provided with a first air vent 921 and a wire hole 922, and the southern region is prone to return of southerly winds, when the southerly winds return, the condensed water condensed from the external connection component 90 will drip onto the rear cover 92, and the condensed water will easily penetrate into the accommodating cavity through the first air vent 921 and the wire hole 922 and drip onto the power module, thereby causing short circuit damage to the power module; in addition, in order to ensure the heat dissipation effect of the light source module, some ceiling lights 9 will provide a second heat dissipation hole 911 on the lamp body 91 and a cavity 923 connected to the heat dissipation hole on the rear cover 92, and this setting will increase the risk of condensed water dripping onto the light source module through the cavity 923 and the second heat dissipation hole 911, resulting in the risk of short circuit damage to the light source module. Summary of the Invention

[0004] In order to solve the above problems, the main purpose of the present invention is to provide a rear cover of a ceiling light which can drain water dripping onto the rear cover.

[0005] Another object of the present invention is to provide a ceiling light provided with the above-mentioned rear cover.

[0006] Another object of the present invention is to provide a lighting system equipped with the above-mentioned ceiling light.

[0007] In order to achieve the main purpose of the utility model, the utility model provides a rear cover of a ceiling light, wherein the rear cover is provided with a water collecting trough and a drainage trough, the water collecting trough is recessed from the top of the rear cover to the inside of the rear cover in the height direction of the rear cover, the inlet end of the drainage trough is connected to the water collecting trough, and the outlet end of the drainage trough extends to the outer peripheral wall of the rear cover.

[0008] As can be seen from the above, during the return of south wind weather, when condensed water condenses on the external connecting parts connected to the rear cover (such as the connection to the lamp pole), the condensed water will drip into the sump and accumulate, and / or, the condensed water condensed on the top of the rear cover itself will also accumulate in the sump; and the condensed water accumulated in the sump will be discharged through the drainage trough according to the set route, preventing the condensed water from seeping into and dripping onto the power module of the ceiling light equipped with this rear cover through the first air vents, wire holes, etc. set on the rear cover, so as to protect the power module.

[0009] A further solution is that the rear cover has a main body, a ring body and more than two connecting ribs, the ring body surrounds the outer circumference of the main body, the connecting ribs are connected between the main body and the ring body, and a cavity is formed between the main body, the ring body and any two adjacent connecting ribs; the water collecting trough is formed on the top of the main body; the number of drainage grooves is less than or equal to the number of connecting ribs, and a drainage groove is formed on the top of the main body, the top of a connecting rib and the top of the ring body and extends to the outer peripheral wall of the ring body.

[0010] As can be seen from the above, the design of the rear cover is conducive to optimizing the rear cover structure and making the rear cover more lightweight. At the same time, the cavity formed by the main body, the ring body and any two adjacent connecting ribs can be connected to the second air vent on the heat dissipation lamp body of the ceiling lamp equipped with this rear cover, thereby better dissipating the heat of the light source module provided in the heat dissipation lamp body to ensure the service life, working stability and reliability of the light source module; in addition, the water collection tank is formed on the top of the main body so that the water collection tank can receive the condensed water dripping from the external connecting parts connected to the rear cover to the greatest extent, and the drainage groove is formed on the top of the main body, the top of the connecting rib and the top of the ring body and extends to the outer peripheral wall of the ring body, which can ensure that the discharged condensed water will not flow into the cavity and the condensed water can be reliably discharged from the rear cover.

[0011] A further solution is that the first top surface of the connecting rib is inclined in the height direction, and the first height of the first top surface close to one end of the main body is greater than the second height of the first top surface close to one end of the ring body; the second top surface of the ring body is inclined in the height direction, and the third height of the second top surface close to one end of the connecting rib is greater than the fourth height of the second top surface close to the outer peripheral wall of the ring body.

[0012] As can be seen from the above, setting the first top surface of the connecting rib to be inclined is conducive to the discharge of condensed water; similarly, setting the second top surface of the ring body to be inclined is also conducive to better discharge of condensed water from the rear cover.

[0013] A further solution is that the first top surface has a first inclined section and a second inclined section, the first inclined section is connected between the main body and the second inclined section, the second inclined section is connected between the first inclined section and the second top surface, and the first angle between the first inclined section and the height direction is greater than the second angle between the second inclined section and the height direction; the drainage groove also extends from the top of the outer peripheral wall of the ring body to the bottom of the outer peripheral wall of the ring body and passes through the outer peripheral wall of the ring body; the bottom of the part of the drainage groove formed on the main body is flush with the bottom of the water collecting tank, or the bottom of the part of the drainage groove formed on the main body is lower than the bottom of the water collecting tank.

[0014] As can be seen from the above, by further setting the first top surface of the connecting rib into a first inclined section and a second inclined section with different angles, the condensed water can better flow to the second top surface of the ring body; and making the drainage groove pass through the outer peripheral wall of the ring body, it is beneficial to better drain the condensed water out of the rear cover and avoid the condensed water hanging on the outer peripheral wall of the ring body over a large area.

[0015] A further solution is that a first air vent is also provided on the top of the main body, and a first enclosure structure is formed between the first air vent and the water collecting tank. In the height direction, the top of the first enclosure structure is higher than the bottom of the water collecting tank; a drainage trough can be formed between the first enclosure structures of two adjacent first air vents.

[0016] As can be seen from the above, the first air vent is arranged at the top of the main body, which makes the formation of the first air vent more convenient, and the first enclosure structure can prevent the condensed water accumulated in the sump from flowing into the first air vent, thereby preventing the condensed water from dripping through the first air vent onto the power module of the ceiling light.

[0017] A further solution is that a wire hole is provided on the top of the main body, and a second enclosure structure is formed between the wire hole and the water collecting tank. In the height direction, the top of the second enclosure structure is higher than the bottom of the water collecting tank.

[0018] As can be seen from the above, the wire hole is set at the top of the main body, which makes the formation of the wire hole more convenient. The second enclosure structure can prevent the condensed water accumulated in the sump from flowing into the wire hole, thereby preventing the condensed water from dripping through the wire hole onto the power module of the ceiling light.

[0019] A further solution is that a connecting platform is provided on the top of the main body, and a connecting hole is provided on the connecting platform, which extends from the top of the connecting platform to the rear cover in the height direction; in the height direction, the top of the connecting platform is higher than the bottom of the water collection tank.

[0020] As can be seen from the above, the connecting platform is used to connect the rear cover and the connecting bracket, making the connection between the ceiling light equipped with the rear cover and the external connecting components more convenient and easy to operate; and making the connecting platform higher than the bottom of the sump can effectively prevent condensation water from dripping onto the power module of the ceiling light through the connecting holes on the connecting platform, or causing the fasteners to rust due to accumulation in the connecting holes, thereby ensuring the firmness and reliability of the connection between the rear cover and the connecting bracket.

[0021] In order to achieve another purpose of the utility model, the utility model provides a ceiling lamp, including a heat dissipation lamp body, a light source module and a power supply module. The heat dissipation lamp body has a lamp cavity, the light source module is installed in the lamp cavity, and the power supply module is electrically connected to the light source module. The ceiling lamp also includes the above-mentioned rear cover, which is located outside the lamp cavity and installed on the top of the heat dissipation lamp body. An accommodating cavity is formed between the rear cover and the heat dissipation lamp body, and the power supply module is installed in the accommodating cavity.

[0022] As can be seen from the above, by setting the above-mentioned rear cover, the ceiling light can collect and discharge the condensed water dripping from the external connecting parts connected to the rear cover (such as the connecting lamp pole) during the return of the south wind, thereby preventing the condensed water from seeping into and dripping onto the power module from the first air vents and wire holes set on the rear cover, thereby protecting the power module.

[0023] A further solution is that the top of the heat dissipation lamp body is provided with a second air hole, the rear cover covers the second air hole, and the second air hole is communicated with the cavity.

[0024] As can be seen from the above, the second air vent provided on the lamp body is conducive to the reliable and efficient heat dissipation of the light source module by the lamp body, so as to ensure the working stability and service life of the light source module. By covering the second air vent with the rear cover, the condensed water discharged by the rear cover can be prevented from flowing into the second air vent, thereby preventing the light source module from being soaked by the condensed water, thereby protecting the light source module.

[0025] In order to achieve another purpose of the present invention, the present invention provides a lighting system, including a control terminal, wherein the lighting system also includes the above-mentioned ceiling light; the control terminal is electrically connected to the power module, and / or the control terminal and the power module exchange information.

[0026] As can be seen from the above, the lighting system uses the above-mentioned ceiling lights, so that it can reduce or eliminate the impact of condensation water during the return of south wind weather, thereby preventing condensation water from seeping into the ceiling lights and causing damage to the power module and / or light source module, thereby extending the service life of the ceiling lights and reducing the use and maintenance costs of the lighting system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of an existing ceiling light.

[0028] Figure 2It is a structural diagram of an embodiment of the utility model ceiling lamp.

[0029] Figure 3 It is an exploded view of an embodiment of the ceiling light of the present utility model.

[0030] Figure 4 It is a structural diagram of the rear cover of an embodiment of the ceiling lamp of the present utility model.

[0031] Figure 5 It is a cross-sectional view of the rear cover of the ceiling lamp embodiment of the present invention.

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0033] Ceiling light embodiment

[0034] Reference Figure 2 and Figure 3 The ceiling lamp 100 includes a rear cover 1, a heat sink body 2, a light source module 3, a power module 4, and a connecting bracket 5. The heat sink body 2 has a lamp cavity. The light source module 3 is mounted on the heat sink body 2 and located within the lamp cavity. This allows the heat sink body 2 to reliably dissipate heat from the light source module 3, ensuring stable operation and a long service life of the light source module 3. The rear cover 1 is mounted on top of the heat sink body 2 and located outside the lamp cavity. A housing cavity is formed between the rear cover 1 and the heat sink body 2. The power module 4 is mounted within this housing cavity and electrically connected to the light source module 3 to provide stable power to the light source module 3 and control the light source module 3 to illuminate according to a set mode. Placing the power module 4 within the housing cavity formed by the rear cover 1 and the heat sink body 2 prevents the power module 4 from occupying space within the lamp cavity and obstructing the illumination of the light source module 3. This design also facilitates reliable heat dissipation from the heat sink body 2 for the light source module 3 and the power module 4. The connecting bracket 5 is mounted on the rear cover 1 , and is used to connect to an external connecting component (such as a connecting lamp pole 10 ) to fix the ceiling lamp 100 at a designated position.

[0035] Combine Figure 4The rear cover 1 is provided with a water collecting trough 111 and a drainage trough 14. The water collecting trough 111 is recessed from the top of the rear cover 1 into the rear cover 1 in the height direction of the rear cover 1. The inlet end of the drainage trough 14 is connected to the water collecting trough 111, and the outlet end of the drainage trough 14 extends to the outer peripheral wall of the rear cover 1. By providing the water collecting trough 111 and the drainage trough 14 on the rear cover 1, when the canopy light 100 is used in the return of southerly weather, condensed water condensed on the connecting lamp pole 10 will drip into the water collecting trough 111 and accumulate, and / or condensed water condensed on the top of the rear cover 1 itself will also accumulate in the water collecting trough 111. When the condensed water accumulates to a certain amount, it will be discharged through the drainage trough 14 according to a predetermined route, thereby preventing the condensed water from seeping into and dripping onto the light source module 3 and / or the power module 4, thereby protecting the light source module 3 and the power module 4. Preferably, the bottom of the water collection tank 111 can be configured to be conical, with the tip of the cone extending toward the opening of the water collection tank 111. This design enables the condensed water dripping into the water collection tank 111 to flow more quickly toward the drainage tank 14, thereby shortening the accumulation time of the condensed water in the water collection tank 111, thereby further reducing the risk of condensed water seeping into and dripping onto the light source module 3 and / or the power supply module 4.

[0036] In this embodiment, the rear cover 1 preferably comprises a main body 11, an annular body 12, and two or more connecting ribs 13. The annular body 12 surrounds the outer circumference of the main body 11, and the connecting ribs 13 connect between the main body 11 and the annular body 12. A cavity 15 is formed between the main body 11, the annular body 12, and any two adjacent connecting ribs 13. Preferably, a second air vent 21 is provided at the top of the heat dissipating lamp body 2. The rear cover 1 covers the second air vent 21, and the second air vent 21 is in communication with the cavity 15. Providing the cavity 15 on the rear cover 1 and the second air vent 21 at the top of the lamp body facilitates reliable and efficient heat dissipation from the light source module 3, thereby ensuring the operational stability and service life of the light source module 3. Covering the second air vent 21 with the rear cover 1 prevents condensed water discharged from the rear cover 1 from flowing into the second air vent 21, thereby preventing the light source module 3 from being soaked by the condensed water and providing protection for the light source module 3. By designing the rear cover 1 as described above, the structure of the rear cover 1 can be further optimized and the lightweight design of the rear cover 1 can be achieved. The cavity 15 formed between the main body 11, the ring body 12 and any two adjacent connecting ribs 13 can cooperate with the second air vents 21 on the heat dissipation lamp body 2, so that the heat dissipation lamp body 2 can better dissipate heat for the light source module 3 arranged therein, thereby ensuring the service life, stability and reliability of the operation of the light source module 3.

[0037] Preferably, the water collection trough 111 is formed at the top of the main body 11 so that the water collection trough 111 can receive condensed water dripping from the connected lamp pole 10 to the greatest extent. The number of drainage grooves 14 is less than or equal to the number of connecting ribs 13, and one drainage groove 14 is formed at the top of the main body 11, the top of one connecting rib 13, and the top of the ring body 12 and extends to the outer peripheral wall of the ring body 12. Forming the drainage groove 14 at the top of the main body 11, the top of the connecting rib 13, and the top of the ring body 12 and extending to the outer peripheral wall of the ring body 12 can ensure that the drained condensed water does not flow into the cavity 15 and can ensure that the condensed water can be reliably discharged from the rear cover 1. Preferably, the bottom of the portion of the drain groove 14 formed on the main body 11 is flush with the bottom of the water collection tank 111, or the bottom of the portion of the drain groove 14 formed on the main body 11 is lower than the bottom of the water collection tank 111. This design facilitates the drainage and complete draining of condensed water from the water collection tank 111, thereby better preventing a large amount of condensed water from accumulating in the water collection tank 111. More preferably, the drain groove 14 extends from the top of the outer peripheral wall of the ring body 12 to the bottom of the outer peripheral wall of the ring body 12 and penetrates the outer peripheral wall of the ring body 12, thereby facilitating the orderly drainage of condensed water from the rear cover 1, thereby preventing a large area of ​​condensed water from being attached to the outer peripheral wall of the ring body 12.

[0038] Among them, the number of drainage grooves 14 can be appropriately increased or decreased according to the strength of the return of south wind in the area where the ceiling lamp 100 is used, so as to ensure that condensed water will not drip onto the light source module 3 and / or the power supply module 4, and the number of connecting ribs 13 can be appropriately increased or decreased according to the size of the rear cover 1 to ensure the strength of the rear cover 1; as in the present embodiment, the number of connecting ribs 13 is eight, the number of drainage grooves 14 is four, and a drainage groove 14 is formed on one of any two adjacent connecting ribs 13.

[0039] Combine Figure 5The first top surface 131 of the connecting rib 13 is preferably inclined in the height direction, and the first height H1 of the first top surface 131 close to one end of the main body 11 is greater than the second height H2 of the first top surface 131 close to one end of the ring body 12. This design is conducive to the discharge of condensed water; preferably, the first top surface 131 has a first inclined section 1311 and a second inclined section 1312, the first inclined section 1311 is connected between the main body 11 and the second inclined section 1312, and the second inclined section 1312 is connected between the first inclined section 1311 and the second top surface 121. The first angle a between the first inclined section 1311 and the height direction is greater than the second angle b between the second inclined section 1312 and the height direction. This design can make the condensed water flow better to the second top surface 121 of the ring body 12. The second top surface 121 of the ring body 12 is preferably also inclined in the height direction, wherein the third height H3 of the second top surface 121 close to one end of the connecting rib 13 is greater than H4 of the second top surface 121 close to the outer peripheral wall of the ring body 12. This design is also conducive to better draining condensed water from the rear cover 1 and can prevent condensed water from flowing back into the cavity 15 along the top surface of the ring body 12.

[0040] In addition, the top of the main body 11 is provided with a first vent hole 112, a wire hole 113, and a connecting platform 114. The first vent hole 112 is connected to the accommodating cavity. Providing the first vent hole 112 at the top of the main body 11 facilitates its formation and facilitates heat dissipation from the power module 4 within the accommodating cavity, thereby ensuring stable operation and extending the service life of the power module 4. A first enclosure structure 1121 is formed between the first air vent 112 and the water collecting tank 111, and in the height direction, the top of the first enclosure structure 1121 is higher than the bottom of the water collecting tank 111. The first enclosure structure 1121 can prevent the condensed water accumulated in the water collecting tank 111 from flowing into the first air vent 112, thereby preventing the condensed water from dripping onto the power module 4 of the ceiling light 100 through the first air vent 112; wherein, a drainage trough 14 can be formed between the first enclosure structures 1121 of two adjacent first air vents 112.

[0041] The wire hole 113 is connected to the accommodating cavity. The wire hole 113 is used for routing external power supply cables, so that the external power supply cables can pass through the wire hole 113 and extend into the accommodating cavity to be electrically connected to the power module 4, so as to supply power to the power module and control the power module to control the light source module 3 to work according to the control terminal signal. The wire hole 113 is arranged at the top of the main body 11, which can make the formation of the wire hole 113 more convenient. Among them, a second enclosure structure 1131 is formed between the wire hole 113 and the water collection tank 111, and in the height direction, the top of the second enclosure structure 1131 is higher than the bottom of the water collection tank 111; the second enclosure structure 1131 can prevent the condensed water accumulated in the water collection tank 111 from flowing into the wire hole 113, thereby preventing the condensed water from dripping through the wire hole 113 onto the power module 4 of the ceiling light 100.

[0042] The connecting platform 114 is provided with a connecting hole 1141, which extends vertically from the top of the connecting platform 114 into the rear cover 1. The top of the connecting platform 114 is higher than the bottom of the sump 111. The connecting platform 114 is used to connect to the connecting bracket 5, making the connection between the ceiling light 100 and the connecting light pole 10 more convenient and easier to operate. Providing that the connecting platform 114 is higher than the bottom of the sump 111 effectively prevents condensed water from dripping through the connecting hole 1141 on the connecting platform 114 onto the power module 4 of the ceiling light 100, or from accumulating in the connecting hole 1141 and causing corrosion of the fasteners, thereby ensuring the secure and reliable connection between the rear cover 1 and the connecting bracket 5.

[0043] In summary, it can be seen that through the design of the rear cover 1 of the ceiling lamp 100, the condensed water dripping from the connecting lamp pole 10 can be collected by the water collecting tank 111 on the rear cover 1 and discharged through the drainage tank 14 during the return of south wind. This prevents the condensed water from seeping into and dripping onto the power module 4 through the first air vent 112 and the wire hole 113 set on the rear cover 1, and also prevents the condensed water from seeping into and dripping onto the light source module 3 through the second air vent 21 of the lamp body, thereby protecting the light source module 3 and the power module 4.

[0044] Lighting system embodiment

[0045] The lighting system includes a control terminal and the ceiling light described in the above-mentioned ceiling light embodiment. The control terminal is electrically connected to the power module of the ceiling light, and / or the control terminal and the power module exchange information. The control terminal can be a conventional control panel (such as a mechanical switch panel), an intelligent control panel, or a remote control. When the control terminal is a conventional control panel, the control terminal is electrically connected to the power module. When the control terminal is an intelligent control panel or remote control, the power module is provided with a first wireless communication module, and the control terminal is provided with a second wireless communication module. The control terminal and the power module are electrically connected, and / or the first wireless communication module and the second wireless communication module exchange information. Furthermore, the control terminal can also be a smart mobile terminal (such as a mobile phone, tablet computer, smart wearable device, etc.), or an artificial intelligence robot. By providing the above-mentioned ceiling light, the lighting system can reduce or eliminate the effects of condensation during the return of southerly winds, thereby preventing condensation from seeping into the ceiling light and damaging the power module and / or light source module, thereby extending the service life of the ceiling light and reducing the use and maintenance costs of the lighting system.

[0046] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The rear cover of the ceiling light is characterized by: The rear cover is provided with a water collecting trough and a drainage trough. The water collecting trough is recessed from the top of the rear cover to the inside of the rear cover in the height direction of the rear cover. The inlet end of the drainage trough is connected to the water collecting trough, and the outlet end of the drainage trough extends to the outer peripheral wall of the rear cover.

2. The rear cover according to claim 1, wherein: The rear cover comprises a main body, a ring body and two or more connecting ribs, wherein the ring body surrounds the outer circumference of the main body, the connecting ribs are connected between the main body and the ring body, and a cavity is formed between the main body, the ring body and any two adjacent connecting ribs; The water collecting tank is formed on the top of the main body; The number of the drainage grooves is less than or equal to the number of the connecting ribs. One drainage groove is formed on the top of the main body, the top of one connecting rib and the top of the ring body and extends to the outer peripheral wall of the ring body.

3. The rear cover according to claim 2, wherein: The first top surface of the connecting rib is inclined to the height direction, and the first height of the first top surface close to one end of the main body is greater than the second height of the first top surface close to one end of the ring body; The second top surface of the ring body is inclined to the height direction, and a third height of the second top surface close to one end of the connecting rib is greater than a fourth height of the second top surface close to the outer peripheral wall of the ring body.

4. The rear cover according to claim 3, wherein: The first top surface has a first inclined section and a second inclined section, the first inclined section is connected between the main body and the second inclined section, the second inclined section is connected between the first inclined section and the second top surface, and a first angle between the first inclined section and the height direction is greater than a second angle between the second inclined section and the height direction; The drainage groove also extends from the top of the outer peripheral wall of the ring body to the bottom of the outer peripheral wall of the ring body and penetrates the outer peripheral wall of the ring body; The bottom of the portion of the drain trough formed on the main body is flush with the bottom of the sump, or The bottom of the portion of the drainage trough formed on the main body is lower than the bottom of the water collecting trough.

5. The rear cover according to any one of claims 2 to 4, characterized in that: The top of the main body is further provided with a first air vent, and a first enclosure structure is formed between the first air vent and the water collecting tank. In the height direction, the top of the first enclosure structure is higher than the bottom of the water collecting tank; The drainage groove can be formed between the first enclosure structures of two adjacent first air holes.

6. The rear cover according to claim 5, wherein: A wire hole is further provided on the top of the main body, and a second enclosure structure is formed between the wire hole and the water collecting tank. In the height direction, the top of the second enclosure structure is higher than the bottom of the water collecting tank.

7. The rear cover according to claim 6, wherein: The top of the main body is further provided with a connecting platform, and the connecting platform is provided with a connecting hole, and the connecting hole extends from the top of the connecting platform to the inside of the rear cover in the height direction; In the height direction, the top of the connecting platform is higher than the bottom of the water collecting tank.

8. Ceiling lights, including: A heat dissipation lamp body, wherein the heat dissipation lamp body has a lamp cavity; a light source module, the light source module being installed in the lamp cavity; a power supply module, the power supply module being electrically connected to the light source module; Its characteristics are: The ceiling lamp also includes a rear cover as described in any one of claims 2 to 7, the rear cover is located outside the lamp cavity and is installed on the top of the heat dissipation lamp body, a receiving cavity is formed between the rear cover and the heat dissipation lamp body, and the power module is installed in the receiving cavity.

9. The ceiling light according to claim 8, characterized in that: The top of the heat dissipation lamp body is provided with a second air vent, the rear cover covers the second air vent, and the second air vent is communicated with the cavity.

10. A lighting system including a control terminal, characterized in that: The lighting system further comprises a ceiling light as claimed in claim 8 or 9; The control terminal is electrically connected to the power module, and / or The control terminal exchanges information with the power supply module.

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