Lighting unit and lighting fixture

Abstract

The utility model provides a kind of lighting unit and lighting lamp, and lighting unit includes plate type lamp body and light source module, recess is shaped on plate type lamp body, recess is preset shape, preset shape is plane spiral, concentric ring or concentric fan ring array, two between the opposite side walls of recess form preset included angle, plate type lamp body is also provided with the convection hole that penetrates itself between the adjacent first section of recess, light source module includes substrate and light emitting device group, substrate is preset shape, substrate is installed in recess, light emitting device group is set on substrate, and the light emitting end of light emitting device group is set towards the notch of recess. Lighting lamp includes above-mentioned lighting unit, and the lighting unit is evenly distributed, avoids local high temperature and good heat dissipation effect.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, specifically to a lighting unit and a lighting fixture equipped with the lighting unit. Background Technology

[0002] Canopy lights are a type of lighting fixture mainly used in spacious places. They are suitable for industrial places (such as factories, workshops, warehouses, etc.), commercial places (such as shopping malls, supermarkets, etc.), public buildings (such as stadiums, waiting rooms, airports, train stations, gas stations, etc.).

[0003] like Figure 1 As shown, the existing ceiling light 9 includes a lamp body 91, a light source plate 92, a light-transmitting plate 93, and a power supply unit 94. The lamp body 91 includes a reflector 911 and a metal back plate 912. The reflector 911 is frustoconical, and the metal back plate 912 is located at the small-diameter end of the reflector 911. The substrate 921 of the light source plate 92 is mounted on the metal back plate 912, and thermal grease is provided between the substrate 921 and the metal back plate 912. The light-transmitting plate 93 is located inside the light-emitting cover and covers the light source plate 92. The power supply unit 94 is located outside the lamp body 91 and connected to the metal back plate 912. The shortcomings of this ceiling light 9 are: The metal backplate 912 relies on its own thermal conductivity and natural convection with the air through its exposed surface to dissipate heat. However, since the metal backplate 912 is a single piece of uniformly thick flat plate (such as a circular or rectangular plate, and the substrate 921 of the light source plate 92 is also a single piece of uniformly thick flat plate), the effective heat dissipation area is insufficient and the thickness is relatively thin. As a result, the heat generated by the light source plate 92 is quickly concentrated in the middle of the metal backplate 912, and it is difficult to conduct it quickly to the edge of the lamp body 91 and dissipate it to the external environment. This easily forms a local high temperature zone, which shortens the service life of the light source plate 92 and the entire lamp. Utility Model Content

[0004] The primary objective of this invention is to provide a lighting unit that offers uniform heat distribution, avoids localized high temperatures, and provides effective heat dissipation.

[0005] The second objective of this invention is to provide a lighting fixture equipped with the aforementioned lighting unit.

[0006] To achieve the first objective of this utility model, this utility model provides a lighting unit, which includes a plate-type lamp body and a light source module. The plate-type lamp body has a groove formed on it. The groove has a preset shape, which is a planar spiral, a concentric ring, or a concentric fan ring array. A preset included angle is formed between the two opposite sidewalls of the groove. The plate-type lamp body also has a convection hole that penetrates itself between adjacent first sections of the groove. The light source module includes a substrate and a light-emitting device group. The substrate has a preset shape and is installed in the groove. The light-emitting device group is disposed on the substrate, and the light-emitting end of the light-emitting device group is arranged facing the groove opening.

[0007] As can be seen from the above, by making targeted structural designs on the groove structure of the plate lamp body (which can significantly increase the heat exchange area) and the substrate of the light source module, the heat generated by the light-emitting device group during operation can be quickly conducted and dissipated through the above structure, which greatly improves the overall heat dissipation efficiency and makes the heat distribution of the plate lamp body more uniform, effectively avoiding the phenomenon of excessive local temperature. In addition, the convection holes added to the plate lamp body can enhance the convection speed of the air on both sides, accelerate the transfer of heat to the surrounding environment, further reduce the overall temperature of the lighting unit, and effectively prevent high temperature in local areas.

[0008] A further option is that the lighting unit also includes a heat-conducting component, which is located between the bottom of the groove and the substrate; the heat-conducting component is thermal grease or a thermal pad.

[0009] As can be seen from the above, the heat-conducting component can transfer the heat generated by the light source module to the plate lamp body more efficiently and evenly, so as to ensure the heat dissipation effect of the light source module and ensure the uniformity of the overall temperature distribution of the plate lamp body, and prevent local high temperature.

[0010] A preferred option is that the planar spiral is a polygonal planar spiral.

[0011] As can be seen from the above, the shape of the groove and the substrate can be flexibly adjusted according to the shape design requirements of the exposed unit, which has strong adaptability, can meet diverse needs, and optimize production flexibility.

[0012] A further approach is to have the spacing between adjacent second segments of the substrate be more than twice the width of the substrate.

[0013] As can be seen from the above, the above design can save substrate materials and reduce costs on the one hand, and allow the lighting unit to be flexibly adjusted according to different usage and production needs on the other hand, ensuring heat dissipation while improving the utilization rate of the substrate.

[0014] A further proposed solution is to have two or more grooves, which are distributed in a rotationally symmetrical manner; and to have two or more light source modules, which correspond one-to-one with the two or more grooves.

[0015] As can be seen from the above, the design allows the number of grooves and light source modules to be flexibly adjusted according to the substrate utilization efficiency, cost, heat dissipation effect and other related indicators, providing corresponding solutions for different application scenarios and design requirements; it not only improves the diversity of production, but also enhances the flexibility of the entire production process and meets different market demands.

[0016] A further proposed solution is to use a quadrilateral planar spiral instead of a polygonal planar spiral; when there are two grooves and two light source modules, the spacing between them is twice the width; when there are four grooves and four light source modules, the spacing between them is four times the width.

[0017] As can be seen from the above, by matching the number of grooves, the number of light source modules, and the structure of the substrate, the lighting unit can be flexibly adjusted according to different design requirements while ensuring heat dissipation, providing diversified production solutions to meet different market demands.

[0018] Another preferred embodiment is that when the preset shape is a concentric ring, the groove includes multiple annular grooves of different diameters arranged concentrically, the substrate includes multiple annular plates of different diameters, one annular plate is installed into an annular groove of a matching diameter, and each annular plate is provided with a light-emitting device group; the number of annular grooves is between three and ten, and the number of annular plates is less than or equal to the number of annular grooves.

[0019] As can be seen from the above, based on the corresponding shape design of the groove and the substrate, the lighting power of the lighting unit can be flexibly adjusted according to the usage requirements by configuring the number of annular grooves in the groove and the number of annular plates on the substrate to adapt to the usage requirements of different scenarios. In addition, the coordinated arrangement of the annular grooves and annular plates can effectively ensure the heat dissipation effect of the light-emitting module and avoid local high temperature.

[0020] Another preferred embodiment is that, when the preset shape is a concentric fan-ring array, the groove includes multiple sets of circularly distributed groove groups, each set of groove groups includes multiple concentrically distributed fan-ring grooves of different diameters, the substrate includes multiple sets of circularly distributed plate groups, each set of plate groups includes multiple concentrically distributed fan-ring plates of different diameters, and each fan-ring plate is provided with a light-emitting device group; the number of groove groups is between three and ten, the number of plate groups is equal to the number of groove groups; the number of fan-ring grooves in each groove group is between three and eight, the number of fan-ring plates in each plate group is between three and eight; when the plate group and the groove group are assembled, one fan-ring plate is installed into a fan-ring groove with a matching radius.

[0021] As can be seen from the above, based on the corresponding shape design of the groove and the substrate, the lighting power of the lighting unit can be flexibly adjusted according to the usage requirements by configuring the number of fan-shaped grooves in the groove and the number of fan-shaped ring plates on the substrate, so as to adapt to the usage requirements of different scenarios. In addition, the cooperative arrangement of the fan-shaped grooves and fan-shaped ring plates can effectively ensure the heat dissipation effect of the light-emitting module and avoid the occurrence of local high temperature.

[0022] A further improvement is that the lighting unit also includes a light-transmitting panel with a preset shape, which covers the opening of the groove; the preset included angle is between 70° and 85°.

[0023] As can be seen above, the light-transmitting plate can improve the lighting effect of the light source module, making the emitted light distribution of the lighting unit more uniform; and by designing the preset angle, the light emitted by the light-emitting device group can be effectively gathered and directionally reflected, ensuring that the light intensity of the light source module meets the standard and the light uniformity meets the preset requirements.

[0024] To achieve the second objective of this utility model, this utility model provides a lighting fixture, including a power supply unit, which further includes the aforementioned lighting unit. The power supply unit is connected to the panel lamp body, and the light source module is electrically connected to the power supply unit.

[0025] As can be seen from the above, by incorporating the aforementioned lighting units, lighting fixtures can improve heat dissipation and extend their service life. Attached Figure Description

[0026] Figure 1 This is an exploded view of the existing lighting fixtures (ceiling lights).

[0027] Figure 2 This is an exploded view of an embodiment of the lighting fixture of this utility model.

[0028] Figure 3 This is a structural diagram of the plate lamp body of an embodiment of the lighting fixture of this utility model.

[0029] Figure 4 This is a partial structural diagram of an embodiment of the lighting fixture of this utility model, with some components omitted.

[0030] Figure 5 This is a structural diagram of the substrate of the lighting fixture embodiment of this utility model when it is a quadrilateral planar spiral.

[0031] Figure 6 This is a temperature surface diagram of existing lighting fixtures.

[0032] Figure 7 This is a temperature surface diagram of a lighting fixture embodiment of the present invention when the preset shape is a quadrilateral planar spiral.

[0033] Figure 8 This is a simulated cross-sectional cloud map of a lighting fixture embodiment of the present invention, where the preset shape is a quadrilateral planar spiral and the plate-type lamp body does not have convection holes.

[0034] Figure 9 This is a simulated cross-sectional cloud map of a lighting fixture embodiment of the present invention, where the preset shape is a quadrilateral planar spiral and the plate-type lamp body is provided with convection holes.

[0035] Figure 10 This is a schematic diagram of the substrate distribution when the preset shape of the lighting fixture of this utility model is a quadrilateral planar spiral and two light source modules are overlapped.

[0036] Figure 11 This is a schematic diagram of the substrate distribution when the preset shape of the lighting fixture of this utility model is a quadrilateral planar spiral and four light source modules are overlapped.

[0037] Figure 12 This is a graph showing the relationship between the ratio of the distribution spacing L to the width W and the temperature when the preset shape of the lighting fixture of this utility model is a quadrilateral planar spiral.

[0038] Figure 13 This is a table showing the relationship between the ratio of the distribution spacing L to the width W and the temperature when the preset shape of the lighting fixture of this utility model is a quadrilateral planar spiral.

[0039] Figure 14 This is a structural diagram of the substrate of the lighting fixture embodiment of this utility model when it is a triangular planar spiral.

[0040] Figure 15 This is a structural diagram of the substrate of the lighting fixture embodiment of this utility model when it is a pentagonal planar spiral.

[0041] Figure 16 This is a structural diagram of the substrate of the lighting fixture embodiment of this utility model when it is a hexagonal planar spiral.

[0042] Figure 17 This is a structural diagram of the substrate of the lighting fixture embodiment of this utility model when it is in the form of concentric rings.

[0043] Figure 18 This is a structural diagram of the substrate of the lighting fixture embodiment of this utility model when it is arranged in a concentric fan-ring array.

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0045] Lighting Fixture Examples Reference Figure 2 The lighting fixture 100 includes a lighting unit 101 and a power supply unit 102. The lighting unit 101 includes a panel lamp body 1, a light source module 2, and a light-transmitting plate 3; the power supply unit 102 is connected to the panel lamp body 1 and is electrically connected to the light source module 2.

[0046] Combination Figure 3 and Figure 4The plate-type lamp body 1 has a groove 11 formed on it, and the groove 11 has a preset shape. A preset included angle α is formed between the two oppositely arranged sidewalls of the groove 11. The preset included angle α is preferably between 70° and 85°. By designing the preset included angle, the light emitted by the light source module 2 placed in the groove 11 can be effectively gathered and directionally reflected to ensure that the light intensity of the light source module 2 meets the standard and the light uniformity meets the preset requirements.

[0047] The preset shape can be a planar spiral, a concentric ring, or a concentric fan ring array. The following uses a planar spiral as an example to further explain the lighting unit 101.

[0048] The light source module 2 includes a substrate 21 and a light-emitting device group 22. The substrate 21 also has a preset shape, so that the shape of the substrate 21 is similar to the shape of the groove 11, thereby allowing the substrate 21 to be accurately installed in the groove 11. The light-emitting device group 22 is disposed on the substrate 21, and the light-emitting end of the light-emitting device group 22 is arranged facing the groove opening of the groove 11.

[0049] The plate-type lamp body 1 can significantly increase the heat exchange area through the structural design of the groove 11 on it. In addition, the shape of the substrate 21 and the shape of the groove 11 can make the heat generated by the light-emitting device group 22 during operation quickly conducted and dissipated through the above structure, greatly improving the overall heat dissipation efficiency and making the heat distribution of the plate-type lamp body 1 more uniform, effectively avoiding the occurrence of local overheating.

[0050] Combination Figure 5 In this embodiment, both the groove 11 and the substrate 21 are generally quadrilateral planar spiral extensions. Preferably, the plate lamp body 1 has convection holes 12 between adjacent first sections of the groove 11, and the convection holes 12 penetrate the plate lamp body 1. The plate lamp body 1 is made of heat-dissipating metal material (including but not limited to aluminum alloy, aluminum-silicon alloy, copper alloy, copper, etc.), and the plate lamp body 1 can be integrally formed by stamping process. With the structural design of the groove 11 and the convection holes 12, the forming of the plate lamp body 1 is simpler and more convenient, and the forming cost is low.

[0051] The convection holes 12 added to the panel lamp body 1 can enhance the convection speed of the air on both sides of the panel lamp body 1, thereby accelerating the transfer of heat to the surrounding environment, and more significantly and efficiently reducing the overall temperature of the lighting unit 101, preventing high temperatures in local areas.

[0052] In addition, a heat-conducting component is provided between the bottom of the groove 11 and the substrate 21. This component creates an efficient heat transfer path between the plate-type lamp body 1 and the substrate 21, allowing the concentrated heat generated by the light source module 2 during operation to be quickly conducted to the plate-type lamp body 1. This improves the heat dissipation effect of the light source module 2 and ensures its long-term stable operation. Furthermore, the heat-conducting component helps to evenly distribute the heat from the light source module 2 to all areas of the lamp body, effectively avoiding localized high temperatures caused by heat accumulation. This ensures the uniformity of the overall temperature field of the plate-type lamp body 1, extends the lifespan of the lamp body, and improves safety. The heat-conducting component can be made of thermal grease or a thermal pad.

[0053] Through simulation software (including but not limited to FloEFD software), traditional lighting fixtures (such as...) Figure 1 Simulation analysis was performed on the lighting fixture 100 of this application (as shown). The simulation environment temperature was set to 25℃. The metal back plate of the traditional lighting fixture and the plate-type lamp body 1 of this application are both made of aluminum alloy. The metal back plate of the traditional lighting fixture and the plate-type lamp body 1 have the same thickness and area. The substrate area of ​​the light source board of the traditional lighting fixture is the same as the area of ​​the light source module 2 of this application. The power of the light source board of the traditional lighting fixture and the power of the light source module 2 of this application are both 100 watts. In addition, other parameters are kept consistent for simulation. The following results were obtained: like Figure 6 As shown, the highest measured solder joint (Tsp) temperature for conventional lighting fixtures is approximately 88.18℃. Figure 7 As shown, the highest solder joint (Tsp) temperature measured on the lighting fixture 100 of this application is approximately 60.55°C; compared to conventional lighting fixtures, the temperature of the lighting fixture 100 of this application decreases by 27.63°C, a reduction of up to 43.73%. The heat dissipation optimization effect is significant.

[0054] Furthermore, simulation analysis was conducted using simulation software (including but not limited to FloEFD software) to determine whether the panel lamp body 1 of the lighting fixture 100 of this application is provided with convection holes 12, with all test parameters and test conditions set identically: such as Figure 8 As shown, when the convection holes 12 are not provided on the plate lamp body 1, the highest measured solder joint temperature (Tsp) is approximately 62.64℃; Figure 9 As shown, when convection holes 12 are provided on the plate lamp body 1, the highest measured solder joint (Tsp) temperature is approximately 58.94℃. The temperature decrease of the scheme with convection holes 12 compared to the scheme without convection holes 12 is approximately 9.83% [(62.64-58.94)]. It can be seen that after the convection holes 12 are opened around the plate lamp body 1, the airflow can accelerate the heat transfer to the surrounding environment axis, thereby reducing the overall temperature of the plate lamp body 1 and solving the problem of local high temperature areas.

[0055] like Figure 10 and Figure 11 As shown, in order to enable the lighting unit 101 to be assembled from two or more light source modules 2, the following design is made for the panel lamp body 1 and the light source module 2: The number of grooves 11 is set to two or more, and the two or more grooves 11 are distributed in a rotationally symmetrical manner; correspondingly, the number of light source modules 2 is two or more, and the two or more light source modules 2 correspond one-to-one with the two or more grooves 11. It can be seen that the number of grooves 11 and light source modules 2 can be flexibly adjusted according to the utilization efficiency, cost, heat dissipation effect and other related indicators of substrate 21, providing corresponding solutions for different application scenarios and design requirements; it not only improves the diversity of production, but also enhances the flexibility of the entire production process and meets different market demands. Furthermore, the distribution spacing L between adjacent second sections of substrate 21 is more than twice the width W of substrate 21; this design can save substrate 21 material and reduce costs on the one hand, and on the other hand, it allows the lighting unit 101 to flexibly adjust the production plan according to different usage and production needs, ensuring heat dissipation effect while improving the utilization rate of substrate 21.

[0056] Assuming the (polygonal) planar spiral is a quadrilateral planar spiral, that is, the groove 11 is a quadrilateral planar spiral and the substrate 21 is a quadrilateral planar spiral. For example Figure 10 As shown, when there are two grooves 11 and two light source modules 2, and the distribution spacing L is twice the width W (i.e., width W: distribution spacing L = 1:2) (hereinafter referred to as "Scheme 1"), two identical substrates 21 can be assembled. In this case, the two grooves 11 on the panel lamp body 1 are centrally symmetrically arranged. Assuming the splicing spacing H of the substrates 21 is 2 mm, the effective utilization rate of the substrates 21 can reach 92%. For example... Figure 11 As shown, when there are four grooves 11 and four light source modules 2, and the distribution spacing L is four times the width W (i.e., width W: distribution spacing L = 1:4) (hereinafter referred to as "Scheme 2"), four identical substrates 21 can be assembled. At this time, the four grooves 11 on the plate lamp body 1 are arranged in rotational symmetry and are evenly distributed around the rotational symmetry axis. Assuming that the splicing spacing H of the four substrates 21 is 2 mm, the effective utilization rate of the substrates 21 can reach 85%.

[0057] Combination Figure 12 and Figure 13 The relationship between the ratio of distribution spacing L to width W and the temperature curve is shown in the figure below. Figure 12 As shown, the larger the ratio, the greater the temperature drop. However, when the ratio of the distribution spacing L to the width W increases to 1:2.8, the temperature decrease slows down. The temperature simulation results corresponding to the ratio of distribution spacing L to width W are shown in [reference needed]. Figure 13 Table showing the relationship between the ratio of distribution spacing L to width W and temperature.

[0058] The ratio of the distribution spacing L to the width W indicates that an optimal heat dissipation scheme is achieved when the distribution spacing L:width W = approximately 1:2.8. Nearly optimal schemes are distribution spacing L:width W = 1:2 and L:width W = 1:4. Therefore, this can guide the choice: when cost is a priority, scheme one is preferred due to its high utilization efficiency of the substrate 21; when heat dissipation is a priority, scheme two is preferred due to its better overall heat dissipation and lower temperature. It is evident that by matching the number of grooves 11, the number of light source modules 2, and the structure of the substrate 21, the lighting unit 101 can be flexibly configured according to different design requirements while ensuring heat dissipation, providing diverse production options to meet different market demands.

[0059] The following is a brief description of some other alternative solutions: When the planar spiral is a polygonal planar spiral, such as Figure 14 As shown, the groove 11 and the substrate 21 can be configured as a triangular planar spiral; or as... Figure 15 As shown, the groove 11 and the substrate 21 can be configured as a pentagonal planar spiral; or as... Figure 16 As shown, the groove 11 and the substrate 21 can be configured as a hexagonal planar spiral; it is understood that the groove 11 and the substrate 21 can also be configured as other polygonal planar spirals, so they will not be illustrated here.

[0060] When the preset shape is a concentric ring, the groove 11 includes multiple annular grooves of different diameters arranged concentrically, while the substrate 21 includes multiple annular plates 211 of different diameters. Each annular plate 211 is installed into an annular groove of a matching diameter. Each annular plate 211 is provided with a light-emitting device group 22. The number of annular grooves is between three and ten, and the number of annular plates 211 is less than or equal to the number of annular grooves. Figure 17For example, assuming the substrate 21 includes three annular plates 211 with different diameters, then as a first matching scheme, the groove 11 includes three annular slots with different diameters arranged concentrically. Each annular plate 211 has an annular slot with a matching diameter, allowing the annular plate 211 to be installed into the annular slot with the matching diameter. As a second matching scheme, the groove 11 includes four or more annular slots with different diameters arranged concentrically. The diameters of three of the four annular slots correspond one-to-one with the diameters of the three annular plates 211, allowing each annular plate 211 to be installed into its corresponding annular slot. It can be seen that, based on the corresponding shape design of the groove 11 and the substrate 21, by configuring the number of annular slots in the groove 11 and the number of annular plates 211 on the substrate 21, the lighting power of the lighting unit 101 can be flexibly adjusted according to usage requirements to adapt to different usage scenarios. Furthermore, the coordinated arrangement of the annular slots and annular plates 211 effectively ensures heat dissipation for the light-emitting module and avoids localized high temperatures.

[0061] When the preset shape is a concentric fan-ring array, the groove 11 includes multiple sets of circularly distributed groove groups, each set of groove groups including multiple concentrically distributed fan-ring grooves of different diameters. The substrate 21 includes multiple sets of circularly distributed plate groups 212, each set of plate groups 212 including multiple concentrically distributed fan-ring plates 2121 of different diameters. Each fan-ring plate 2121 is provided with a light-emitting device group 22. The number of groove groups is between three and ten, and the number of plate groups 212 is equal to the number of groove groups. The number of fan-ring grooves in each groove group is between three and eight, and the number of fan-ring plates 2121 in each plate group 212 is between three and eight. When the plate group 212 is assembled with the groove group, one fan-ring plate 2121 is installed into a fan-ring groove with a matching radius. Figure 18 For example, suppose the substrate 21 includes six circularly distributed plate groups 212, each plate group 212 including four concentrically distributed fan ring plates 2121 with different diameters (resembling a Wi-Fi icon). In the first matching scheme, the groove 11 includes six circularly distributed groove groups, each groove group including four concentrically distributed fan ring grooves with different diameters, so that each fan ring plate 2121 of each plate group 212 can be installed into a corresponding fan ring groove of the corresponding groove group (at this time, the radius of the fan ring plate 2121 matches the radius of the corresponding fan ring groove). In the second matching scheme, the number of groove groups is still six, but each groove group includes five or more concentrically distributed fan ring grooves with different diameters. The radius of four of the five or more fan ring grooves corresponds one-to-one with the radius of the four fan ring plates 2121, so that each fan ring plate 2121 can be installed into a corresponding fan ring groove.

[0062] The light-transmitting plate 3 has the same preset shape as the groove 11 and the substrate 21, and the light-transmitting plate 3 covers the opening of the groove 11. The light-transmitting plate 3 is used to improve the lighting effect of the light source module 2, so that the emitted light distribution of the lighting unit 101 is more uniform.

[0063] In summary, the design of the lighting unit 101 of the lighting fixture 100 effectively improves the heat dissipation of the light source module 2, extending the lifespan of the light source module 2 and the entire lamp. Furthermore, the design of the recess 11 eliminates the need for a lens component, reducing lens material costs. Compared to traditional lighting fixtures, the lighting fixture 100 provided in this application achieves an overall heat dissipation improvement of approximately 43.73%, while also avoiding the problem of localized high temperatures.

[0064] Finally, it should be emphasized that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lighting unit, characterized in that, include: A plate-type lamp body, wherein a groove is formed on the plate-type lamp body, the groove having a preset shape, the preset shape being a planar spiral, a concentric ring, or a concentric fan ring array, and a preset included angle is formed between two opposing sidewalls of the groove, and the plate-type lamp body is also provided with convection holes penetrating itself between adjacent first sections of the groove; A light source module includes a substrate and a light-emitting device group. The substrate has the preset shape and is installed in the groove. The light-emitting device group is disposed on the substrate, and the light-emitting end of the light-emitting device group is arranged facing the groove opening.

2. The lighting unit according to claim 1, characterized in that: The lighting unit also includes a heat-conducting component, which is disposed between the bottom of the groove and the substrate; The thermal conductive component is thermal grease or a thermal pad.

3. The lighting unit according to claim 2, characterized in that: The planar spiral is a polygonal planar spiral.

4. The lighting unit according to claim 3, characterized in that: The spacing between adjacent second segments of the substrate is more than twice the width of the substrate.

5. The lighting unit according to claim 4, characterized in that: The number of grooves is two or more, and the two or more grooves are distributed in a rotationally symmetrical manner; The number of light source modules is two or more, and the two or more light source modules correspond one-to-one with the two or more grooves.

6. The lighting unit according to claim 5, characterized in that: The polygonal planar spiral is a quadrilateral planar spiral; When there are two grooves and two light source modules, the distribution spacing is twice the width; When the number of the grooves and the number of the light source modules are both four, the distribution spacing is four times the width.

7. The lighting unit according to claim 2, characterized in that: When the preset shape is the concentric ring, the groove includes multiple annular grooves of different diameters arranged concentrically, the substrate includes multiple annular plates of different diameters, one annular plate is installed in an annular groove with a matching diameter, and each annular plate is provided with the light-emitting device group. The number of annular grooves is between three and ten, and the number of annular plates is less than or equal to the number of annular grooves.

8. The lighting unit according to claim 2, characterized in that: When the preset shape is the concentric fan ring array, the groove includes multiple sets of circularly distributed groove groups, each set of groove groups includes multiple fan ring grooves that are concentrically distributed and have different diameters, the substrate includes multiple sets of circularly distributed plate groups, each set of plate groups includes multiple fan ring plates that are concentrically distributed and have different diameters, and each fan ring plate is provided with the light-emitting device group. The number of slot groups is between three and ten, and the number of plate groups is equal to the number of slot groups; The number of fan ring grooves in each group of grooves is between three and eight, and the number of fan ring plates in each group of plates is between three and eight; When the plate group and the groove group are assembled, one of the fan ring plates is installed into a fan ring groove with a matching radius.

9. The lighting unit according to any one of claims 1 to 8, characterized in that: The lighting unit also includes a light-transmitting plate, which is in the preset shape and covers the opening of the groove; The preset included angle is between 70° and 85°.

10. A lighting fixture, including a power supply unit, characterized in that, It also includes a lighting unit as described in any one of claims 1 to 9, wherein the power supply unit is connected to the panel lamp body, and the light source module is electrically connected to the power supply unit.

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