A flashlight

Abstract

The utility model relates to lighting technical field, concretely relates to a flashlight, including cylinder, mounting seat and lamp cap, and cylinder is equipped with the containing cavity of installation power supply, mounting seat is connected with the front end of cylinder, and the mounting cavity of installation heat dissipation fan is formed in mounting seat, and the outer peripheral surface of mounting seat is provided with the heat dissipation air inlet that links up with the mounting cavity, lamp cap includes lamp cap shell and light source subassembly, and lamp cap shell is the heat conduction structure, and lamp cap shell is installed in the one end of mounting seat away from cylinder, and light source subassembly is installed in the cavity inside lamp cap shell, and the cavity still is installed with the reflecting cup, and the outer peripheral surface of lamp cap shell is provided with the heat dissipation air outlet that extends to the outer wall surface of cavity and links up with the mounting cavity. Because air and the outer wall surface of cavity carry out heat exchange longer time, improve the heat dissipation efficiency. Because can set up the heat dissipation air inlet, the heat dissipation air outlet of larger area respectively on the outer peripheral surface of mounting seat, lamp cap shell, to further improve the heat dissipation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, and more specifically, to a flashlight. Background Technology

[0002] A flashlight is a handheld electronic lighting tool. Currently, flashlights on the market typically use LED light sources as bulbs and are powered by lithium batteries or alkaline dry batteries. However, these flashlights usually have low power and low brightness. If high-power light sources and batteries are used, they will generate high temperatures after prolonged use, which can easily burn your hands.

[0003] To address the heat dissipation issue in flashlights, some manufacturers have begun incorporating cooling fans for active cooling. However, current designs typically place the air inlet and outlet on opposite sides of the light source. Since one side is the inlet and the other the outlet, air entering through the inlet cannot efficiently exchange heat with the components requiring cooling and is immediately exhausted through the outlet, resulting in low cooling efficiency. Furthermore, having one side as the inlet and the other as the outlet leads to a relatively small inlet and outlet area, further impacting cooling efficiency. Utility Model Content

[0004] The purpose of this invention is to overcome the problem that the air inlet and outlet of the flashlight in the prior art are set on both sides of the light source, resulting in low heat dissipation efficiency, and to provide a flashlight that can improve heat dissipation efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A flashlight is provided, comprising a body, a mounting base, and a lamp head. The body has a cavity for housing a power source. The mounting base is connected to the front end of the body and has a mounting cavity. A cooling fan is installed in the mounting cavity, and a cooling air inlet communicating with the mounting cavity is provided on the outer peripheral surface of the mounting base. The lamp head includes a lamp head housing and a light source assembly electrically connected to the power source. The lamp head housing is a heat-conducting structure and is installed at the end of the mounting base away from the body. A cavity is formed inside the lamp head housing, and the light source assembly is installed on the inner bottom surface of the cavity. A reflector for reflecting the light projected by the light source assembly is also installed in the cavity. A cooling air outlet is provided on the outer peripheral surface of the lamp head housing, extending to the outer wall of the cavity and communicating with the mounting cavity.

[0006] In the technical solution of this application, the light source assembly generates a large amount of heat during operation. Since the light source assembly is installed inside the cavity, and the lamp holder housing is a heat-conducting structure, the heat generated by the light source assembly is conducted through the cavity wall to the outer wall of the cavity. Furthermore, the light projected by the light source assembly during operation is reflected by the reflector, and the heat from the reflector is also conducted through the cavity wall to the outer wall of the cavity. Because a cooling fan is installed in the mounting cavity of the mounting base, and a heat dissipation vent is opened on the outer peripheral surface of the lamp holder housing, extending to the outer wall of the cavity and communicating with the mounting cavity, the cooling fan draws in outside air through the heat dissipation inlet and then exhausts it through the heat dissipation outlet. During this process, the outside air exchanges heat with the outer wall of the cavity, thereby carrying away the heat from the outer wall and cooling the outer wall of the cavity. On the one hand, because the heat exchange time between the outside air and the outer wall of the cavity is longer, the heat dissipation efficiency is improved. On the other hand, since the heat dissipation air inlet is located on the outer peripheral surface of the mounting base and the heat dissipation air outlet is located on the outer peripheral surface of the lamp holder housing, the heat dissipation air inlet and the heat dissipation air outlet are staggered. Therefore, a larger area of ​​heat dissipation air inlet can be set on the outer peripheral surface of the mounting base and a larger area of ​​heat dissipation air outlet can be set on the outer peripheral surface of the lamp holder housing, thereby further improving the heat dissipation efficiency.

[0007] Furthermore, a first guide surface is formed on the outer wall surface of the cavity corresponding to the heat dissipation outlet, and the diameter of the first guide surface gradually increases along the projection direction of the light source assembly so that the air outlet direction of the heat dissipation outlet is approximately along the projection direction of the light source assembly.

[0008] Furthermore, the heat dissipation vent is tapered with one side larger than the other, and the smaller side of the heat dissipation vent faces the cooling fan.

[0009] Furthermore, the diameter of the cavity gradually increases along the projection direction of the light source assembly, the diameter of the reflector cup is adapted to the diameter of the cavity, and a heat dissipation space is formed between the outer wall surface of the reflector cup and the inner wall surface of the cavity.

[0010] Furthermore, the lamp head housing has a light outlet, and a light-transmitting sheet is installed at the light outlet, forming a sealed space between the light-transmitting sheet and the cavity.

[0011] Furthermore, there is a gap between the cooling fan and the bottom of the lamp head housing to allow air to flow to the outer wall of the cavity.

[0012] Furthermore, the heat dissipation air inlet is tapered with one side larger than the other, and the smaller side of the heat dissipation air inlet faces the cooling fan.

[0013] Furthermore, the heat dissipation air inlet is inclined upwards from the side with the larger port to the side with the smaller port, and a second airflow guide surface is formed.

[0014] Furthermore, a heat dissipation strip is formed on the portion of the lamp holder housing between two adjacent heat dissipation vents.

[0015] Furthermore, the light source assembly is mounted on the inner bottom surface of the cavity, and the light source assembly includes at least a heat-conducting sheet and a light source. The heat-conducting sheet is mounted on the inner bottom surface of the cavity, and the light source is disposed on the heat-conducting sheet.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: In this utility model, when the light source assembly is working, it generates a large amount of heat. Since the light source assembly is installed inside the cavity, and the lamp holder shell is a heat-conducting structure, the heat generated by the light source assembly is conducted to the outer wall of the cavity through the cavity wall. Furthermore, the light projected by the light source assembly during operation is reflected by the reflector, and the heat on the reflector is also conducted to the outer wall of the cavity through the cavity wall. Because a cooling fan is installed in the mounting cavity of the mounting base, and a heat dissipation vent is opened on the outer peripheral surface of the lamp holder shell, extending to the outer wall of the cavity and communicating with the mounting cavity, the cooling fan draws in outside air from the heat dissipation inlet and then exhausts it from the heat dissipation vent. During this process, the outside air exchanges heat with the outer wall of the cavity, thereby carrying away the heat from the outer wall and cooling the outer wall of the cavity. On the one hand, because the heat exchange time between the outside air and the outer wall of the cavity is longer, the heat dissipation efficiency is improved. On the other hand, since the heat dissipation air inlet is located on the outer peripheral surface of the mounting base and the heat dissipation air outlet is located on the outer peripheral surface of the lamp holder housing, the heat dissipation air inlet and the heat dissipation air outlet are staggered. Therefore, a larger area of ​​heat dissipation air inlet can be set on the outer peripheral surface of the mounting base and a larger area of ​​heat dissipation air outlet can be set on the outer peripheral surface of the lamp holder housing, thereby further improving the heat dissipation efficiency. Attached Figure Description

[0017] Figure 1 This is a perspective view of the flashlight of this utility model; Figure 2 This is the front view of the flashlight of this utility model; Figure 3 for Figure 2 A sectional view along line A-A; Figure 4 This is an exploded view of the flashlight of this utility model; Figure 5 This is a schematic diagram of the structure of the flashlight of this utility model with the light-transmitting sheet removed; Figure 6 This is a schematic diagram of the structure of the flashlight of this utility model with the lamp head removed; Figure 7This is a perspective view of the lamp head shell in the flashlight of this utility model; Figure 8 This is a perspective view of the lamp head housing in the flashlight of this utility model, taken from a top view. Figure 9 This is a perspective view of the lamp head housing in the flashlight of this utility model, taken from a top view. Figure 10 This is a perspective view of the mounting bracket in the flashlight of this utility model, viewed from below. Figure 11 This is a schematic diagram of the structure of the flashlight of this utility model, in which a control module is provided on the mounting base.

[0018] In the attached diagram: 1. Cylinder; 2. Mounting base; 3. Cooling fan; 4. Lamp head; 5. Reflector; 6. Light-transmitting sheet; 7. Heat dissipation space; 8. Control module; 9. Wire; 10. Pressure ring; 21. Mounting cavity; 22. Heat dissipation air inlet; 41. Lamp head housing; 42. Light source assembly; 43. Cavity; 44. Heat dissipation air outlet; 45. First airflow guide surface; 46. Light outlet; 23. Second airflow guide surface; 47. Heat dissipation strip; 421. Heat-conducting sheet; 422. Light source; 11. Receiving cavity; 12. Power supply; 48. Recessed space; 49. Second through hole; 50. Second connecting hole; 51. Abutment part; 24. Mounting bracket; 25. First through hole; 27. First connecting hole; 26. Fastener; 28. Lower cavity.

[0019] in, Figure 3 A single arrow indicates the direction of light emission from the light source component, while a double arrow indicates the direction of airflow from the heat dissipation vent. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0021] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] Example 1 like Figures 1 to 6 As shown, a flashlight includes a tube body 1, a mounting base 2, and a lamp head 4. The tube body 1 has a receiving cavity 11 for mounting a power supply 12. The mounting base 2 is connected to the front end of the tube body 1 and has a mounting cavity 21. A cooling fan 3 is installed in the mounting cavity 21. A heat dissipation air inlet 22 communicating with the mounting cavity 21 is opened on the outer peripheral surface of the mounting base 2. The lamp head 4 includes a lamp head shell 41 and a light source assembly 42 electrically connected to the power supply 12. The lamp head shell 41 is a heat-conducting structure and is installed at the end of the mounting base 2 away from the tube body 1. A cavity 43 is formed inside the lamp head shell 41. The light source assembly 42 is installed on the inner bottom surface of the cavity 43. A reflector cup 5 for reflecting the light projected by the light source assembly 42 is also installed in the cavity 43. A heat dissipation air outlet 44 is opened on the outer peripheral surface of the lamp head shell 41 and extends to the outer wall of the cavity 43 and communicates with the mounting cavity 21.

[0023] In this embodiment, when the light source assembly 42 is working, it generates a large amount of heat. Since the light source assembly 42 is installed inside the cavity 43, it can be mounted on the inner bottom surface of the cavity 43. The lamp holder housing 41 is a heat-conducting structure, and the heat generated by the light source assembly 42 is conducted through the wall of the cavity 43 to the outer wall of the cavity 43. Furthermore, the light projected by the light source assembly 42 during operation is reflected by the reflector 5, and the heat from the reflector 5 is also conducted through the wall of the cavity 43 to the outer wall of the cavity 43. Because a cooling fan 3 is installed in the mounting cavity 21 of the mounting base 2, and a heat dissipation vent 44 is opened on the outer peripheral surface of the lamp holder housing 41, the heat dissipation vent 44 extends to the outer wall of the cavity 43 and communicates with the mounting cavity 21. During the process of the cooling fan 3 drawing in outside air through the heat dissipation inlet 22 and then expelling it through the heat dissipation vent 44, the outside air exchanges heat with the outer wall of the cavity 43, thereby carrying away the heat from the outer wall of the cavity 43 and cooling the outer wall of the cavity 43. On the one hand, because the heat exchange time between the outside air and the outer wall of the cavity 43 is longer, the heat dissipation efficiency is improved. On the other hand, since the heat dissipation air inlet 22 is located on the outer peripheral surface of the mounting base 2, and the heat dissipation air outlet 44 is located on the outer peripheral surface of the lamp holder housing 41, the heat dissipation air inlet 22 and the heat dissipation air outlet 44 are offset. Therefore, a larger area of ​​heat dissipation air inlet 22 can be provided on the outer peripheral surface of the mounting base 2, and a larger area of ​​heat dissipation air outlet 44 can be provided on the outer peripheral surface of the lamp holder housing 41, thereby further improving the heat dissipation efficiency. The lamp holder housing 41 is a heat-conducting structure, and a metal structure can be used as the heat-conducting structure.

[0024] In this embodiment, multiple heat dissipation vents 44 are provided, and each heat dissipation vent 44 is distributed at intervals along the circumferential direction on the circumferential surface of the lamp holder housing 41. Multiple heat dissipation inlets 22 are also provided, and each heat dissipation inlet 22 is distributed at intervals along the circumferential direction on the outer circumferential surface of the mounting base 2. Because there are multiple heat dissipation vents 44, the total outlet area of ​​the multiple heat dissipation vents 44 is larger, and because there are multiple heat dissipation inlets 22, the total intake area of ​​the heat dissipation inlets 22 is larger, further improving heat dissipation efficiency. Since the lamp holder housing 41 is a thermally conductive structure, and the cavity 43 is formed within the lamp holder housing 41, and the wall surface of the cavity 43 is also a thermally conductive structure, it can achieve good heat conduction effect.

[0025] It should be noted that in this embodiment, the power supply 12 installed in the receiving cavity 11 can supply power to the cooling fan 3, or an independent power supply 12 can be installed in the mounting cavity 21 to supply power to the cooling fan 3. Here, a mounting bracket is fixed in the mounting cavity 21, and the cooling fan 3 is rotatably mounted on the mounting bracket 24. The cooling fan 3 is an axial flow fan. The purpose of using an axial flow fan is to discharge the outside air drawn in from the cooling inlet along the axial direction of the rotation axis to the cooling outlet 44. Since the cooling fan 3 is installed in the mounting cavity 21, one side of the cooling outlet 44 on the mounting base 2 is connected to the outside, and the other side of the cooling outlet 44 is connected to the mounting cavity 21; a cooling outlet 44 is formed on the lamp holder housing 41, one side of which is connected to the mounting cavity 21, and the other side of which is connected to the outside. This creates a flow channel between the heat dissipation inlet 22, the mounting cavity 21, and the heat dissipation outlet 44. When the flashlight is used in rainy weather or underwater, rainwater can enter the mounting cavity 21 through the heat dissipation inlet 22 and the heat dissipation outlet 44, potentially damaging the cooling fan 3. To prevent damage to the cooling fan 3 due to rainwater entering the mounting cavity 21, a waterproof fan can be used in this embodiment. Furthermore, a control module 8 is installed in the body 1. Since the control module 8 and the power supply 12 are both installed in the body 1, and the body 1 is a sealed structure, the flashlight's sealing performance is ensured.

[0026] It should also be pointed out that, such as Figures 7 to 11As shown, the control module 8 is electrically connected to the light source assembly 42. A control switch is provided on the cylinder 1, which is connected to the control module 8 to control the lighting or shutdown of the light source assembly 42. The control switch can also synchronously control the start and stop of the cooling fan 3. The control switch can be located on the outer circumference of the cylinder 1 or at the tail of the cylinder 1. The control switch can be a push-button structure or a toggle switch design. The mounting base 2 and the cylinder 1 can be connected by a threaded connection to achieve a detachable connection. Specifically, the mounting base 2 has an external / internal thread at the end connected to the cylinder 1, and the cylinder 1 has a corresponding internal / external thread at the end connected to the mounting base 2. The detachable connection between the mounting base 2 and the cylinder 1 is achieved through the threaded connection between the internal and external threads. When the mounting base 2 forms a lower cavity 28 on the lower side of the mounting cavity 21, the lower cavity 28 can be used to install the control module 8. The internal thread connected to the cylinder 1 is formed on the inner wall surface of the lower cavity 28. The mounting base 2 has a first through hole 25 on its wall surface. One end of the first through hole 25 is connected to the lower cavity 28, and the other end extends to the end face of the mounting base 2 connected to the lamp holder housing 41. The mounting base 2 and the lamp holder housing 41 can be detachably connected by screws. Other ways to connect the mounting base 2 and the lamp holder housing 41 are also included in this embodiment. Specifically, the mounting base 2 has a first connecting hole 27 at the end connected to the lamp holder housing 41, and the lamp holder housing 41 has a second connecting hole 50 and a second through hole 49 corresponding to the position of the first through hole 25 at the end connected to the mounting base 2. A clearance space 48 is provided on the inner wall surface of the cavity 43. The second connecting hole 50 and the second through hole 49 are located in the clearance space 48. By connecting fasteners 26, which can be fastening screws, in the first connecting hole 27 and the second connecting hole 50, the lamp holder housing 41 is connected to the cylinder 1. The number of the first connecting hole 27 and the second connecting hole 50 can be reasonably set as needed. The control module 8 is installed in the lower cavity 28, and the wire 9 connecting the control module 8 passes through the first through hole 25 and the second through hole 49 and then connects to the light source assembly 42.

[0027] like Figure 3 , Figure 7As shown, a first guide surface 45 is formed on the outer wall surface of the cavity 43 corresponding to the heat dissipation outlet 44. The diameter of the first guide surface 45 gradually increases along the projection direction of the light source assembly 42 so that the air outlet direction of the heat dissipation outlet 44 is approximately along the projection direction of the light source assembly 42. In this embodiment, since the diameter of the first guide surface 45 gradually increases along the projection direction of the light source assembly 42, the first guide surface 45 is set at an angle. This angle is set at an acute angle with the center line of the reflector cup 5. When the air flowing in from the heat dissipation inlet 22 exchanges heat with the outer wall surface of the cavity 43, the resulting hot air will be discharged along this angle, so that the discharged hot air is approximately in the same direction as the projection direction of the light source assembly 42. It should be noted that the airflow direction of the heat dissipation vent 44 is roughly along the projection direction of the light source assembly 42. This can be understood as the airflow direction of the heat dissipation vent 44 facing forward, even if at a certain angle. It should be considered that the airflow direction of the heat dissipation vent 44 is roughly the same as the projection direction of the light source assembly 42. More specifically, when the angle between the airflow direction of the heat dissipation vent 44 and the center line of the reflector cup 5 is less than 30°, the airflow direction of the heat dissipation vent 44 is also roughly the same as the projection direction of the light source assembly 42. It should also be noted that since the airflow direction of the heat dissipation vent 44 is roughly along the direction of the projected light from the light source assembly 42, the hot air discharged through the heat dissipation vent 44 can flow along the direction of the projected light from the light source assembly 42. Figure 3 As shown, this avoids hot air blowing from the heat dissipation vent 44 onto the user's body, causing discomfort and reducing the user experience.

[0028] like Figures 1 to 5 As shown, the heat dissipation outlet 44 is a tapered structure with one side larger than the other, and the smaller end of the heat dissipation outlet 44 faces the cooling fan 3. When the lamp holder housing 41 is connected to the mounting base 2, the smaller end of the heat dissipation outlet 44 is formed on the side connected to the mounting cavity 21, while the larger end of the heat dissipation outlet 44 is connected to the outside. In this embodiment, by designing the heat dissipation outlet 44 as a tapered structure with a smaller port facing the cooling fan 3 and a larger port on the outside, this tapering structure is similar to the principle of a Laval nozzle, thereby significantly improving the overall heat dissipation performance. Specifically, according to the "continuity equation" (A1V1=A2V2) in fluid mechanics, when the airflow flows from the port with a smaller cross-sectional area to the port with a larger cross-sectional area, the airflow is accelerated at the "throat" of the outlet (i.e., at the smaller port), forming a high-speed jet. This high-speed airflow can more effectively "tear" and carry away the static hot air boundary layer on the outer wall of the cavity 43, greatly enhancing the forced convection heat transfer efficiency. At the same time, the high-speed airflow can carry more kinetic energy, quickly expelling heat to the outside, avoiding heat backflow and accumulation, thus achieving a rapid reduction in core temperature.

[0029] like Figure 7 As shown, a heat dissipation strip 47 is formed on the lamp head housing 41 between two adjacent heat dissipation vents 44. In this embodiment, the lamp head housing 41 between two adjacent heat dissipation vents 44 forms a heat dissipation strip 47, and the heat conducted to the cavity housing can also be exchanged with the outside air through the heat dissipation strip 47, thereby improving the heat dissipation effect of the flashlight.

[0030] like Figure 4 As shown, the lamp head housing 41 has a light outlet 46, and a light-transmitting sheet 6 is installed at the light outlet 46, forming a sealed space between the light-transmitting sheet 6 and the cavity 43. In this embodiment, the light projected by the light source assembly 42 is reflected by the reflector cup 5 and then projected outward through the light-transmitting sheet 6 installed at the light outlet 46. Since a sealed space is formed between the light-transmitting sheet 6 and the cavity 43, the sealed structure achieves a waterproof effect, preventing rainwater from entering the cavity 43 and damaging the light source assembly 42 when the flashlight is used in rainy weather. It should be noted that the light-transmitting sheet 6 can be connected to the light outlet 46 in any of the following ways: the first connection method is that the lamp head housing 41 has a mounting step at the light outlet 46, and the edge of the light-transmitting sheet 6 is connected to the mounting step by adhesive. The second connection method: The outer peripheral surface of the light outlet 46 is provided with an external thread structure. The light-transmitting sheet 6 is located on the light-emitting cup. A pressure ring 10 is threadedly connected to the external thread structure of the light outlet 46. The pressure ring 10 is a cylindrical structure. An internal thread structure is provided on the inner peripheral surface of the pressure ring 10. The internal thread structure is threadedly connected to the external thread structure of the light outlet 46. The opening at the end of the pressure ring 10 away from the light source assembly 42 is smaller than the opening at the end closer to the light source assembly 42. When the pressure ring 10 is threadedly connected to the light outlet 46, the opening at the smaller end of the pressure ring 10 is pressed against the reflector cup 5.

[0031] like Figure 3As shown, there is a gap between the cooling fan 3 and the bottom of the lamp holder housing 41 to allow air to flow to the outer wall of the cavity 43. In this embodiment, since there is a gap between the cooling fan 3 and the bottom of the lamp holder housing 41, which is formed by the distance between the cooling fan 3 and the bottom of the lamp holder housing 41, the setting of this gap allows the air flowing in from the heat dissipation inlet 22 to flow along the direction of the gap under the action of the cooling fan 3, thereby blowing more comprehensively to the outer wall of the cavity 43, thereby improving the heat dissipation effect of the outer wall of the cavity 43. Specifically, an abutment portion 51 is formed on the outer periphery of the bottom of the lamp holder housing 41 at a position corresponding to the heat dissipation outlet 44. The abutment portion 51 is connected to the end face of the mounting base 2, and there is a height difference between the end face of the abutment portion 51 and the outer bottom surface of the lamp holder housing 41 in the projection direction of the light source assembly 42. The setting of the height difference also creates a gap between the cooling fan 3 and the bottom of the lamp holder housing 41. The thickness of the cooling fan 3 along the axial direction is less than the depth of the mounting cavity 21, which also allows a gap to be formed between the cooling fan 3 and the bottom of the lamp holder housing 41.

[0032] like Figure 5 As shown, the light source assembly 42 is mounted on the inner bottom surface of the cavity 43. The light source assembly 42 includes at least a heat-conducting plate 421 and a light source 422. The heat-conducting plate 421 is mounted on the inner bottom surface of the cavity 43, and the light source 422 is disposed on the heat-conducting plate 421. In this embodiment, the light source assembly 42 is mounted on the inner bottom surface of the cavity 43. The heat generated by the light source assembly 42 during operation can be directly and quickly conducted to the outer bottom surface of the cavity 43 through the inner bottom surface of the cavity 43. The cooling fan 3 is closer to the outer bottom surface of the cavity 43, which is more conducive to heat dissipation of the light source assembly 42.

[0033] More specifically, the light source 422 generates a large amount of heat during operation. The heat-conducting plate 421 is in contact with the inner bottom surface of the cavity 43. The heat from the light source 422 is conducted to the heat-conducting plate 421, which then conducts the heat to the bottom and outer walls of the cavity 43. Heat is then exchanged between the air flowing into the heat dissipation vent 44 and the outer wall of the cavity 43, achieving heat dissipation on the inner wall of the cavity 43. The heat conducted to the bottom wall of the cavity 43 can be transferred to the outer bottom surface of the cavity 43 more quickly. The cooling fan 3 is closer to the outer bottom of the cavity 43, which further facilitates heat dissipation for the light source 422. It should be noted that the power supply 12 is connected to the light source 422, and the light source 422 is also connected to the control module 8, which controls the light source 422 to turn on, off, and perform other control commands. It should be noted that when the reflector 5 is installed in the cavity 43, the light projected by the light source 43 during operation can be reflected by the reflector 5 and then projected to the outside through the light outlet 46. A third connecting hole is provided on the heat-conducting plate 421 of the light source assembly 42, opposite the second connecting hole 50. Fastening screws are simultaneously connected to the third connecting hole, the second connecting hole 50, and the first connecting hole 27, thereby fixing the heat-conducting plate 421 to the inner bottom surface of the cavity 43. Thermal silicone is used to connect the light source 422 and the heat-conducting plate 421, and thermal silicone is also provided at the connection between the heat-conducting plate 421 and the inner bottom surface of the cavity 43. With the reflector 5 installed in the cavity 43, the light source 422 of the light source assembly 42 can be located in one end opening of the reflector 5, which is close to one end of the power supply 12.

[0034] Example 2 This embodiment 2 is similar to embodiment 1, except that, as Figure 5 As shown, the diameter of the cavity 43 gradually increases along the projection direction of the light source assembly 42. The diameter of the reflector cup 5 is adapted to the diameter of the cavity 43, and a heat dissipation space 7 is formed between the outer wall surface of the reflector cup 5 and the inner wall surface of the cavity 43. In this embodiment, the diameter of the cavity 43 gradually increases along the projection direction of the light source assembly 42 to adapt to the shape of the reflector cup 5. In addition, since a heat dissipation space 7 is formed between the outer wall surface of the reflector cup 5 and the inner wall surface of the cavity 43, the heat dissipation space 7 facilitates the transfer of heat accumulated on the reflector cup 5 to the heat dissipation space 7, and then conducts it to the outer wall surface of the cavity 43 through the heat dissipation space 7. The heat on the outer wall surface of the cavity 43 exchanges heat with the air passing through the heat dissipation outlet 44, thereby achieving the purpose of heat dissipation of the outer wall surface of the cavity 43.

[0035] Example 3 This embodiment 3 is similar to embodiment 1, except that, as Figures 1 to 4As shown, the heat dissipation air inlet 22 is tapered with one side larger than the other, and the smaller side of the heat dissipation air inlet 22 faces the cooling fan 3. In this embodiment, since the opening size of the heat dissipation air inlet 22 gradually decreases from the side closer to the outside to the side closer to the cooling fan 3, the tapering design of the heat dissipation air inlet 22 follows the "Venturi effect" principle in fluid mechanics. When air flows from the larger side of the heat dissipation air inlet 22 to the smaller side, the cross-sectional area of ​​the flow channel decreases, and the airflow velocity increases significantly. This high-speed airflow is directly guided to the blades of the cooling fan 3, and can be more efficiently "captured" by the cooling fan 3 and delivered to the heat dissipation air outlet 44. This reduces airflow turbulence and energy loss at the heat dissipation air inlet 22, thereby effectively increasing the airflow volume at the same cooling fan 3 rotation speed.

[0036] like Figure 9 As shown, the heat dissipation air inlet 22 is inclined upwards from the side with the larger port to the side with the smaller port, and a second guide surface 23 is formed thereon. In this embodiment, due to the setting of the second guide surface 23 and the fact that the second guide surface 23 faces the cooling fan 3, the air entering from the heat dissipation air inlet 22 can be guided to the cooling fan 3 along the second guide surface 23, ensuring the stability of the flowing air.

[0037] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0038] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A flashlight, characterized in that, include: The cylindrical body (1) is provided with a receiving cavity (11) for installing a power supply (12). Mounting base (2), the mounting base (2) is connected to the front end of the cylinder (1), the mounting base (2) has a mounting cavity (21) formed in the mounting base (2), a cooling fan (3) is installed in the mounting cavity (21), and a cooling air inlet (22) communicating with the mounting cavity (21) is opened on the outer peripheral surface of the mounting base (2). The lamp head (4) includes a lamp head shell (41) and a light source assembly (42) electrically connected to the power supply (12). The lamp head shell (41) is a heat-conducting structure. The lamp head shell (41) is installed at one end of the mounting base (2) away from the cylinder (1). A cavity (43) is formed inside the lamp head shell (41). The light source assembly (42) is installed in the cavity (43). A reflector cup (5) for reflecting the light projected by the light source assembly (42) is also installed in the cavity (43). A heat dissipation vent (44) is opened on the outer peripheral surface of the lamp head shell (41). The heat dissipation vent (44) extends to the outer wall of the cavity (43) and communicates with the mounting cavity (21).

2. The flashlight according to claim 1, characterized in that, A first guide surface (45) is formed on the outer wall surface of the cavity (43) corresponding to the heat dissipation outlet (44). The diameter of the first guide surface (45) gradually increases along the projection direction of the light source assembly (42) so that the air outlet direction of the heat dissipation outlet (44) is approximately along the projection direction of the light source assembly (42).

3. The flashlight according to claim 2, characterized in that, The heat dissipation vent (44) is tapered with one side being larger and the other side being smaller, and the smaller side of the heat dissipation vent (44) is oriented towards the cooling fan (3).

4. The flashlight according to claim 1, characterized in that, The diameter of the cavity (43) gradually increases along the projection direction of the light source assembly (42), the diameter of the reflector (5) is adapted to the diameter of the cavity (43), and a heat dissipation space (7) is formed between the outer wall surface of the reflector (5) and the inner wall surface of the cavity (43).

5. The flashlight according to claim 1, characterized in that, The lamp head housing (41) has a light outlet (46), and a light-transmitting sheet (6) is installed at the light outlet (46), forming a sealed space between the light-transmitting sheet (6) and the cavity (43).

6. The flashlight according to claim 1, characterized in that, There is a gap between the cooling fan (3) and the bottom of the lamp holder housing (41) to allow air to flow to the outer wall of the cavity (43).

7. The flashlight according to claim 1, characterized in that, The heat dissipation air inlet (22) is gradually narrowed with one side being larger and the other side being smaller, and the smaller side of the heat dissipation air inlet (22) is oriented towards the heat dissipation fan (3).

8. The flashlight according to claim 7, characterized in that, The heat dissipation air inlet (22) is inclined upward along the side with the larger port to the side with the smaller port and forms a second guide surface (23).

9. The flashlight according to claim 1, characterized in that, The portion of the lamp holder housing (41) between two adjacent heat dissipation vents (44) forms a heat dissipation strip (47).

10. The flashlight according to any one of claims 1 to 9, characterized in that, The light source assembly (42) is installed on the inner bottom surface of the cavity (43). The light source assembly (42) includes at least a heat-conducting plate (421) and a light source (422). The heat-conducting plate (421) is installed on the inner bottom surface of the cavity (43), and the light source (422) is disposed on the heat-conducting plate (421).

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