A luminaire and method having a heat dissipation structure

Abstract

This invention provides a lamp and method with a heat dissipation structure, relating to the field of lighting fixture technology. The lamp includes a light source, a lampshade body, a cylindrical body, a hidden vent, a phase change cavity, and heat dissipation fins for the cavity. Heat dissipation is achieved by filling the phase change cavity with a phase change liquid for evaporation, and the heat dissipation fins are installed on the phase change cavity for heat dissipation. The hidden vent carries away the heat generated by the light source during airflow and guides airflow into the interior of the cylindrical body, accelerating the heat dissipation of the cavity and the phase change cavity. This allows the downlight to achieve a multiple increase in power within the same volume, satisfying the balance between high-power lighting and size and heat dissipation, and solving the technical problem of existing LED lamps that are difficult to balance the size of the lighting fixture and heat dissipation.

Description

Technical Field

[0001] This invention relates to the field of lighting fixtures, and more specifically to a lamp with a heat dissipation structure and a method thereof. Background Technology

[0002] LED lighting technology has been widely used in general lighting, commercial lighting, industrial lighting, and high-end displays. However, with the increasing market demand for high-power, high-brightness, and miniaturized luminaires, especially in high-end applications such as road lighting, stadiums, ports, and airports, the technical shortcomings of existing LED luminaires in many aspects have become increasingly prominent, becoming a key bottleneck restricting the development of the industry.

[0003] When LED light sources are working, about 70% to 80% of the electrical energy is converted into heat energy. If the heat cannot be dissipated in time, it will directly lead to a sharp rise in temperature, which will result in overheating failure. Moreover, every few degrees the temperature of the LED light source rises will seriously affect the lifespan of the lamp. In order to achieve sufficient heat dissipation capacity, traditional LED lamps have to be equipped with large-area heat sinks and heat dissipation systems to achieve high-power LED light source lighting. However, this solution often results in the heat sink being bulky, heavy, and more expensive, making it inconvenient to install, repair, and replace, and making it difficult to balance the size of the lighting fixture with heat dissipation. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a lamp and method with a heat dissipation structure.

[0005] A lamp with a heat dissipation structure includes: a light source, a lampshade body, and a cylindrical body. The light source is mounted on the lampshade body, and the lampshade body is mounted on the cylindrical body. A hidden ventilation opening is provided on the inner side of the lampshade body, and the hidden ventilation opening is connected to the interior of the cylindrical body to allow airflow to remove the heat generated during the light emission process of the light source. A phase change cavity is also provided inside the cylindrical body, and the phase change cavity is filled with a phase change liquid for evaporative heat dissipation. The phase change cavity is provided with cavity heat dissipation fins, and the cross-sectional area of ​​the phase change cavity is smaller than the cross-sectional area of ​​the cylindrical body.

[0006] Furthermore, the lamp also includes a light source mounting plate, on which the light source is mounted. The light source mounting plate and the phase change cavity are an integral structure used to transfer the heat generated during the light emission process to the phase change cavity. An annular heat dissipation channel is provided between the light source mounting plate and the cylinder to allow air passing through the hidden vent to flow to the outside and be discharged.

[0007] Furthermore, the lamp also includes a fan, which is mounted on the heat dissipation fins of the cavity and is located inside the cylinder at the end away from the light source.

[0008] Furthermore, the difference between the cross-sectional area of ​​the cylinder and the cross-sectional area of ​​the phase change cavity satisfies: ,in, The cross-sectional area of ​​the cylinder is... This represents the cross-sectional area of ​​the phase change cavity. This is the heat transfer correction factor. The thermal power of the light source. air density, The specific heat capacity of air, The average air velocity. This represents the temperature difference between the air after passing through the heat dissipation fins of the cavity and the air before passing through the heat dissipation fins. The turbulence enhancement coefficient of the heat dissipation fins in the cavity is given. The radial length of the heat dissipation fins in the cavity. This is the minimum gap distance between the cylinder and the phase change cavity.

[0009] Furthermore, the lamp also includes an axial limiting baffle with a T-shaped cross section. The axial limiting baffle is connected to the lamp cover body, and the light source is in contact with the axial limiting baffle.

[0010] Furthermore, the lamp also includes a lampshade heat sink, which is connected to the lampshade body and the axial limiting baffle.

[0011] Furthermore, a hidden connecting post is provided on the back of the lampshade body, and an internal connecting through hole is provided on the light source mounting plate, with the hidden connecting post and the internal connecting through hole cooperating for connection.

[0012] Furthermore, a microgroove is provided at one end of the phase change cavity near the light source. The cross-section of the microgroove is a continuous Z-shaped structure, and a rounded corner structure is provided between adjacent Z-shaped structures. The size of the rounded corner structure is 1~2 mm, and the tilt angle M of the Z-shaped structure is 1~45 degrees. The relationship between the interval distance e between adjacent Z-shaped structures and the depth f of the Z-shaped structure satisfies: e:f=1:1.5.

[0013] Furthermore, the lamp also includes a rear end cover, which is connected to the cylinder body and has a rear end ventilation hole.

[0014] The present invention also includes a method for heat dissipation of a lamp, which is based on a lamp with a heat dissipation structure as described in any of the preceding claims, and includes the following steps: In step S1, the light source generates heat during the emission process. Air enters through the hidden vent, carrying away the heat generated by the light source and flowing into the interior of the cylinder. In step S2, while performing step S1, the phase change liquid flows into the phase change cavity near the light source. The phase change liquid evaporates upon heating and carries away the heat. In step S3, after the phase change liquid evaporates in step S2, it flows to the side wall of the phase change cavity. After cooling, it transforms back into a phase change liquid. This cycle is used to dissipate heat, and the heat is transferred from the side wall of the phase change cavity to the heat dissipation fins of the cavity. In step S4, while performing steps S2 and S3, the air flowing into the cylinder in step S1 carries away the heat transferred from the side wall of the phase change cavity to the heat dissipation fins of the cavity and transfers it to the outside of the lamp.

[0015] The technical solution of this invention has the following advantages: In the technical solution provided by this invention, heat dissipation is achieved by filling the phase change cavity with phase change liquid for evaporation, and heat dissipation fins are installed on the phase change cavity for heat dissipation. The hidden vents carry away the heat generated by the light source during air circulation and guide the air to the inside of the cylinder, accelerating the heat dissipation fins and the phase change cavity for heat dissipation. This allows the downlight fixture to achieve a multiple increase in power within the same volume, satisfying the balance between high-power lighting and size and heat dissipation. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the rear end cover of the present invention; Figure 3 This is a schematic diagram of the limiting connection arm of the present invention; Figure 4 This is a schematic diagram of the structure of the light source mounting plate of the present invention; Figure 5 This is a schematic diagram of the phase change cavity of the present invention; Figure 6 This is a schematic diagram of the structure of the microgroove of the present invention; Figure 7 This is a schematic diagram of the structure of the lampshade body of the present invention; Figure 8 This is a cross-sectional view of the light source and cavity heat dissipation fins of the present invention; Figure 9 This is a cross-sectional view showing the relationship between the light source and the lampshade body of the present invention. Figure 10 This is a cross-sectional view of the microgroove structure of the present invention; Figure 11This is a schematic diagram of the structure of the fan of the present invention.

[0018] 1-Light source; 2-Lamp cover body; 201-Hidden ventilation opening; 202-Axial limiting baffle; 203-Lamp cover heat sink; 204-Hidden connecting post; 3-Cylinder; 4-Light source mounting plate; 401-Internal connecting through hole; 402-Light source mounting hole; 5-Rear end cover; 501-Rear end ventilation hole; 502-Limiting connecting arm; 6-Phase change cavity; 601-Micro groove; 602-Limiting block; 603-Cavity heat dissipation fins; 604-Connecting post; 7-Fan. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] like Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9The lamp fixture shown includes a heat dissipation structure, comprising: a light source 1, a lampshade body 2, and a cylindrical body 3. The light source 1 is mounted on the lampshade body 2, and the lampshade body 2 is mounted on the cylindrical body 3. A hidden ventilation opening 201 is provided on the inner side of the lampshade body 2. The hidden ventilation opening 201 is connected to the interior of the cylindrical body 3 for airflow to remove the heat generated by the light source 1 during the light emission process. A phase change cavity 6 is also provided inside the cylindrical body 3. The phase change cavity 6 is a closed cavity structure and is filled with a phase change liquid for evaporative heat dissipation. A cavity heat dissipation fin 603 is provided on the phase change cavity 6 and is connected to the cylindrical body 3. The cross-sectional area of ​​the phase change cavity 6 is smaller than that of the cylindrical body 3.

[0024] The aforementioned lamp with a heat dissipation structure dissipates heat through evaporation by filling the phase change cavity 6 with phase change liquid, and the heat dissipation fins 603 of the cavity are installed on the phase change cavity 6 to dissipate heat. The hidden vent 201 carries away the heat generated by the light source 1 during air circulation and guides the air to the inside of the cylinder 3, accelerating the heat dissipation fins 603 and the phase change cavity 6. This allows the downlight lamp to achieve a multiple increase in power within the same volume, satisfying the balance between high-power lighting and size and heat dissipation.

[0025] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, in this embodiment, the lamp also includes a light source mounting plate 4. The light source 1 is mounted on the light source mounting plate 4. The light source mounting plate 4 and the phase change cavity 6 are an integral structure used to transfer the heat generated during the light emission process of the light source 1 to the phase change cavity 6. An annular heat dissipation channel is provided between the light source mounting plate 4 and the cylinder 3 to allow air passing through the hidden vent 201 to flow to the outside and be discharged. The size of the light source mounting plate 4 can be adjusted according to the power and model of the light source 1. When more air is needed for heat dissipation, reducing the cross-sectional size of the light source mounting plate 4 can allow more air to circulate and enhance heat dissipation. The light source mounting plate 4 has multiple sets of light source mounting holes 402, which are arranged in a cross shape. The above settings can meet the installation requirements of different models and types of LED lights. During the manufacturing process, the light source mounting plate 4 and the phase change cavity 6 are integrally formed. This design allows the heat generated by the light source 1 during its light emission process to be quickly conducted to the phase change cavity 6 for heat dissipation, preventing heat accumulation and overheating failure of the downlight. The annular heat dissipation channel between the light source mounting plate 4 and the cylinder 3 allows air passing through the hidden vent 201 to flow into the cylinder 3 and then to the outside of the downlight fixture, forming an air duct inside the downlight. The heat generated by the light source 1 during its light emission process is also transferred to the lampshade body 2, and the air duct carries away the heat. This eliminates the need for an additional heat dissipation system to increase the size and space occupied, balancing the size and heat dissipation of the downlight. Even high-power LED lights can provide normal lighting.

[0026] like Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 , Figure 9 and Figure 11 As shown, in this embodiment, the lamp also includes a fan 7, which is mounted on the cavity heat dissipation fins 603. The fan 7 is located inside the cylinder 3 at the end away from the light source 1. Multiple sets of connecting posts 604 are provided on the cavity heat dissipation fins 603. The connecting posts 604 are used to connect with the components on the downlight. The connecting posts 604 serve as positioning and connecting mechanisms, enabling quick insertion or threaded connection and fastening, reducing assembly time and labor costs. Moreover, the hole positions are precise, improving the rigidity of the overall structure. The connecting posts 604 and the cavity heat dissipation fins 603 are integrally formed and can serve as a heat transfer structure, further improving heat dissipation efficiency. The mounting frame of the fan 7 is fixedly connected by cooperating with the connecting posts 604. The fan 7 serves as an active heat dissipation mechanism to blow the heat inside the cylinder 3 to the outside, thereby accelerating the dissipation of heat inside the cylinder 3 and preventing heat accumulation.

[0027] like Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 and Figure 9 As shown, in this embodiment, the difference between the cross-sectional area of ​​the cylinder 3 and the cross-sectional area of ​​the phase change cavity 6 satisfies: ,in, Here is the cross-sectional area of ​​cylinder 3, in square meters. This represents the cross-sectional area of ​​phase change cavity 6, in square meters. This is a heat transfer correction factor, selected based on the thermal conductivity of the phase change liquid, and typically ranges from 0.85 to 1.15. The thermal power of light source 1 is expressed in W. Air density, unit: kg / m³ 3 , This is the specific heat capacity of air, expressed in J / (kg·K). The average air velocity is expressed in m / s. This represents the temperature difference between the air after passing through the heat dissipation fins 603 and the air temperature before passing through the heat dissipation fins 603, expressed in Kelvin (K). The turbulence enhancement coefficient of the cavity heat dissipation fin 603 is determined according to the shape of the cavity heat dissipation fin 603, and is generally taken as 0.12~0.28. The radial length of the heat dissipation fins 603 in the cavity is expressed in meters (m). The minimum gap distance between the cylinder 3 and the phase change cavity 6 is expressed in meters. The cross-section of the cylinder 3 and the cross-section of the phase change cavity 6 are generally connected by an approximately annular air duct. The cross-sectional area of ​​the cylinder 3 and the cross-sectional area of ​​the phase change cavity 6 determine the heat that the downlight can dissipate as a whole. In addition, it is also related to the heat dissipation capacity of the downlight. Under the premise that the heat dissipation remains constant, the stronger the heat dissipation capacity of the downlight, the smaller the difference between the cross-sectional area of ​​the cylinder 3 and the cross-sectional area of ​​the phase change cavity 6 required.

[0028] like Figure 1 , Figure 7 , Figure 8 and Figure 9 As shown, in this embodiment, the lamp also includes an axial limiting baffle 202. The axial limiting baffle 202 has a T-shaped cross-section and is connected to the lamp cover body 2. The light source 1 is in contact with the axial limiting baffle 202. The axial limiting baffle 202 is used to limit the contact with the light source 1 in the axial direction. The light source 1 is mounted on a rubber ring, which contacts the axial limiting baffle 202 and is then connected by screws. By squeezing the rubber ring, a seal can be formed, preventing water or dust from entering the cavity of the light source 1, thereby affecting the service life of the light source 1. Moreover, the T-shaped structure of the axial limiting baffle 202 can also provide expansion solutions.

[0029] like Figure 1 , Figure 7 , Figure 8 and Figure 9 As shown, in this embodiment, the lamp also includes a lampshade heat sink 203, which is connected to the lampshade body 2 and the axial limiting baffle 202. The lampshade heat sink 203 is evenly distributed along the lampshade body 2, and the lampshade heat sink 203 corresponds to the position of the hidden ventilation opening 201. By setting the lampshade heat sink 203, on the one hand, the air flowing through the hidden ventilation opening 201 can be guided to circulate and dissipate heat, and on the other hand, it can also help to dissipate the heat carried in the air, effectively dissipating the heat generated by the light source 1 through multiple pathways.

[0030] like Figure 1 , Figure 4 , Figure 7 and Figure 9 As shown in this embodiment, a hidden connecting post 204 is provided on the back of the lampshade body 2, and an inner connecting through hole 401 is provided on the light source mounting plate 4. The hidden connecting post 204 and the inner connecting through hole 401 are connected together. The hidden connecting posts 204 are evenly distributed on the back of the lampshade body 2. The hidden connecting posts 204 and the inner connecting through hole 401 are connected by bolts to achieve a hidden connection inside the downlight. When viewed from the front of the downlight, there are no obvious connection points, ensuring the integrity and aesthetics of the lamp.

[0031] like Figure 1 , Figure 5 , Figure 6 , Figure 8 , Figure 9 and Figure 10As shown, in this embodiment, a microgroove 601 is provided at one end of the phase change cavity 6 near the light source 1. The cross-section of the microgroove 601 is a continuous Z-shaped structure, and a rounded corner structure is provided between adjacent Z-shaped structures. The size of the rounded corner structure is 1~2 mm, and the tilt angle M of the Z-shaped structure is 1~45 degrees. The relationship between the interval distance e between adjacent Z-shaped structures and the depth f of the Z-shaped structure satisfies: e:f=1:1.5. The Z-shaped structure and the rounded corner structure form a smooth transition structure, which can effectively avoid stress concentration points and flow dead zones in the phase change liquid. When the phase change liquid flows back under the action of capillary force, the rounded corner can guide the liquid to flow more evenly, reduce eddies and local backflow stagnation, and also make the heat dissipation of the hot end of the phase change cavity 6 more even. The tilt angle M of the Z-shaped structure is 1~45 degrees. By setting the sidewall of the Z-shaped structure to be tilted outward, the balance between capillary pressure and flow resistance can be adjusted. The narrow bottom section provides high capillary pressure to drive the liquid upward, while the wide upper section reduces flow resistance. This design is particularly suitable for the evaporation end near the light source 1, where high capillary pressure attracts the liquid to quickly remove heat. Furthermore, the relationship between the spacing e between adjacent Z-shaped structures and the depth f of the Z-shaped structure is set to e:f = 1:1.5. This ensures that the depth can accommodate sufficient phase change liquid to dissipate heat in a timely manner when the heat from the light source 1 increases. However, the depth cannot be too deep, as excessive depth will significantly increase the viscous resistance of the phase change liquid in the return path. At the same time, the spacing ensures that the phase change liquid in adjacent tank structures overflows and replenishes each other, preventing uneven heat dissipation due to the failure of a single tank structure. Therefore, by setting the above ratio of spacing to tank depth, the liquid storage volume can be guaranteed without significantly increasing flow resistance, and the stability of heat dissipation can also be improved.

[0032] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, in this embodiment, the lamp also includes a rear end cover 5, which is connected to the cylindrical body 3. The rear end cover 5 has a rear end ventilation hole 501. The rear end ventilation hole 501 is used to assist air circulation. Multiple sets of rear end ventilation holes 501 are evenly distributed on the rear end cover 5. At the same time, the rear end cover 5 is also provided with a limiting connection arm 502. The limiting connection arm 502 is provided with a hook structure, and the inner wall of the cylindrical body 3 is correspondingly provided with a limiting block 602 structure. The hook structure on the limiting connection arm 502 and the limiting block 602 are rotated to achieve a locking connection, thereby realizing the installation connection between the rear end cover 5 and the cylindrical body 3. In addition, the hole opened on the rear end cover 5 can also be used as the power supply cable inlet and outlet of the lamp, which facilitates the installation and connection of the power cable.

[0033] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 11 As shown, the present invention also includes a heat dissipation method for a lamp, which is based on a lamp with a heat dissipation structure as described in any of the above claims, and includes the following steps: In step S1, the light source 1 generates heat during the light emission process. Air enters through the hidden vent 201, carrying away the heat generated by the light source 1 and flowing into the interior of the cylinder 3. In step S2, while performing step S1, the phase change liquid flows into the phase change cavity 6 at one end near the light source 1. The phase change liquid evaporates upon heating and carries away the heat. In step S3, after the phase change liquid evaporates in step S2, it flows to the side wall of the phase change cavity 6. After cooling, it transforms back into a phase change liquid. This cycle is used to dissipate heat, and the heat is transferred from the side wall of the phase change cavity 6 to the cavity heat dissipation fins 603. In step S4, while performing steps S2 and S3, the air flowing into the cylinder 3 in step S1 carries away the heat transferred from the side wall of the phase change cavity 6 to the heat dissipation fins 603 of the cavity and transfers it to the outside of the lamp. Specifically, the light source 1 generates heat during its light emission process. A small portion of this heat is transferred through the front end of the light source 1, i.e., to the lampshade body 2. The majority of the remaining heat is transferred to the rear end, meaning the main heat needs to be dissipated through the rear light source mounting plate 4 and the phase change cavity 6. During the entire heat dissipation process, airflow cooling and evaporative cooling by the phase change cavity 6 are carried out synergistically. Airflow cooling, while maintaining the overall appearance and aesthetics of the downlight fixture, achieves heat dissipation by allowing air to enter through the hidden vent 201. After the air flows through the hidden vent 201 and carries away the heat from the lampshade body 2, ... Guided by the heat sink 203, the liquid flows through the annular heat dissipation channel at the light source mounting plate 4. At the same time, the phase change liquid flows to the end of the phase change cavity 6 near the light source 1, which is the micro-groove 601 structure. The phase change liquid evaporates when heated and carries away the heat. After evaporation, the phase change liquid flows to the side wall of the phase change cavity 6. After cooling, it turns back into phase change liquid. This cycle is used for heat dissipation. The heat is transferred from the side wall of the phase change cavity 6 to the heat dissipation fins 603 of the cavity. The external air passing through the annular heat dissipation channel can carry away the heat on the heat dissipation fins 603 of the cavity and finally exhaust it to the outside of the downlight fixture through the fan 7. After verification, by using the above-mentioned air heat dissipation and phase change liquid synergistic heat dissipation, the downlight fixtures can ensure higher power illumination without changing the volume. The table below shows the heat dissipation comparison data of light source 1 with different composition structures and different powers.

[0034] The table content is explained below. The column for heat dissipation structure composition represents the heat dissipation of different structures, including four scenarios: no heat dissipation structure; a heat dissipation structure with a phase change cavity 6 and its internal microgrooves 601, cavity heat dissipation fins 603, and phase change liquid; a heat dissipation structure with a phase change cavity 6 and its internal microgrooves 601, cavity heat dissipation fins 603, phase change liquid, lampshade body 2, and hidden vent 201 ... and a heat dissipation structure with a phase change cavity 6 and its internal microgrooves 601, cavity heat dissipation fins 603, phase change liquid, lampshade body 2, and hidden vent 201. The heat dissipation structure includes the heat fins 603, phase change liquid, lamp cover body 2, hidden vent 201, and fan 7; power refers to the operating power of the light source 1, in W; solder joint temperature Tc specifically refers to the industry-standard temperature measurement point, which is the temperature of the lamp housing and is the most direct and commonly used parameter for assessing the thermal condition of LEDs. The solder joint temperature Tc in the table above measures the negative electrode temperature of the power supply of the light source 1 in actual temperature measurement, which is a relatively accurate measurement method. The unit of solder joint temperature Tc is °C; Ambient temperature refers to the ambient temperature in the test environment, measured in °C. Temperature rise refers to the difference between the solder joint temperature Tc and the ambient temperature under the same heat dissipation structure and power. This is to avoid the influence of different ambient temperature fluctuations on the measurement results, thus obtaining the actual temperature rise data. Temperature reduction rate refers to the percentage reduction in temperature of different heat dissipation structures compared to those without any heat dissipation structure under the same power. The calculation method is to subtract the temperature rise data with heat dissipation structure from the temperature rise data without any heat dissipation structure, then divide the difference by the temperature rise data without any heat dissipation structure, and multiply the result by 100% to obtain the temperature reduction rate of each heat dissipation structure. The temperature reduction rate also visually shows the heat dissipation effect of different heat dissipation structures. Obviously, by using the solution of this invention to dissipate heat from the lamp, it can be seen that the temperature is significantly reduced under different power levels. Moreover, as the power increases, the temperature reduction rate of the lamp also increases without significant attenuation, achieving effective cooling and ensuring the service life of the lamp.

[0035] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A lamp fixture with a heat dissipation structure, comprising: The light source (1), lampshade body (2) and cylinder (3) are characterized in that the light source (1) is installed on the lampshade body (2), the lampshade body (2) is installed on the cylinder (3), a hidden ventilation port (201) is provided on the inner side of the lampshade body (2), the hidden ventilation port (201) is connected to the interior of the cylinder (3) for air flow to remove the heat generated by the light source (1) during the light emission process, and a phase change cavity (6) is also provided inside the cylinder (3), the phase change cavity (6) is filled with a phase change liquid for evaporation and heat dissipation, and a cavity heat dissipation fin (603) is provided on the phase change cavity (6), and the cross-sectional area of ​​the phase change cavity (6) is smaller than the cross-sectional area of ​​the cylinder (3).

2. A lamp with a heat dissipation structure according to claim 1, characterized in that, The lamp also includes a light source mounting plate (4), on which the light source (1) is mounted. The light source mounting plate (4) and the phase change cavity (6) are an integral structure used to transfer the heat generated by the light source (1) during the light emission process to the phase change cavity (6). An annular heat dissipation channel is provided between the light source mounting plate (4) and the cylinder (3) to allow the air passing through the hidden vent (201) to flow to the outside and be discharged.

3. A lamp with a heat dissipation structure according to claim 1, characterized in that, The lamp also includes a fan (7), which is mounted on the heat dissipation fins (603) of the cavity and is located inside the cylinder (3) at the end away from the light source (1).

4. A lamp with a heat dissipation structure according to claim 1, characterized in that, The difference between the cross-sectional area of ​​the cylinder (3) and the cross-sectional area of ​​the phase change cavity (6) satisfies: ,in, The cross-sectional area of ​​the cylinder (3) is... Let be the cross-sectional area of ​​the phase change cavity (6). This is the heat transfer correction factor. The thermal power of the light source (1) air density, The specific heat capacity of air, The average air velocity. The temperature difference between the air after passing through the heat dissipation fins (603) and before passing through the heat dissipation fins (603) is the value of the difference between the air temperature and the air temperature before passing through the heat dissipation fins (603). The turbulence enhancement coefficient of the cavity heat dissipation fins (603) is given. The radial length of the cavity heat dissipation fins (603) is given. It is the minimum gap distance between the cylinder (3) and the phase change cavity (6).

5. A lamp with a heat dissipation structure according to claim 1, characterized in that, The lamp also includes an axial limiting baffle (202), the cross section of which is T-shaped. The axial limiting baffle (202) is connected to the lamp cover body (2), and the light source (1) is in contact with the axial limiting baffle (202).

6. A lamp with a heat dissipation structure according to claim 5, characterized in that, The lamp also includes a lampshade heat sink (203), which is connected to the lampshade body (2) and the axial limiting baffle (202).

7. A lamp with a heat dissipation structure according to claim 2, characterized in that, The back of the lampshade body (2) is provided with a hidden connecting post (204), and the light source mounting plate (4) is provided with an inner connecting through hole (401). The hidden connecting post (204) and the inner connecting through hole (401) are connected in cooperation.

8. A lamp with a heat dissipation structure according to claim 1, characterized in that, The phase change cavity (6) has a microgroove (601) at one end near the light source (1). The cross-section of the microgroove (601) is a continuous zigzag structure, and there is a rounded corner structure between adjacent zigzag structures. The size of the rounded corner structure is 1~2 mm, and the tilt angle M of the zigzag structure is 1~45 degrees. The relationship between the interval distance e between adjacent zigzag structures and the depth f of the zigzag structure satisfies: e:f=1:1.

5.

9. A lamp with a heat dissipation structure according to claim 1, characterized in that, The lamp also includes a rear end cover (5), which is connected to the cylinder (3) and has a rear end ventilation hole (501) on it.

10. A method for heat dissipation of a lamp, the method being implemented based on a lamp with a heat dissipation structure as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Step S1: The light source (1) generates heat during the light emission process. Air enters from the hidden vent (201), carrying away the heat generated by the light source (1) and flowing into the interior of the cylinder (3). In step S2, while performing step S1, the phase change liquid flows to the end of the phase change cavity (6) near the light source (1), and the phase change liquid evaporates when heated and carries away the heat. In step S3, after the phase change liquid evaporates in step S2, it flows to the side wall of the phase change cavity (6), and after being cooled, it transforms back into a phase change liquid. This cycle is used to dissipate heat, and the heat is transferred from the side wall of the phase change cavity (6) to the heat dissipation fins (603). In step S4, while performing steps S2 and S3, the air flowing into the cylinder (3) in step S1 carries away the heat transferred from the side wall of the phase change cavity (6) to the heat dissipation fins (603) of the cavity and transfers it to the outside of the lamp.

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