An LED light bulb

Abstract

The LED bulb comprises a lamp cap, an annular light source plate, a light-transmitting cover with a bowl-shaped main body and a thin-walled inner heat dissipation cylinder, a heat dissipation body with an outer heat dissipation cylinder and heat dissipation fins, a circular hole is formed in the center of the bottom surface of the main body, the inner heat dissipation cylinder is arranged in and tightly pressed in the inner hole of the light source plate, the bottom of the inner heat dissipation cylinder is connected with the hole of the circular hole, the top of the inner heat dissipation cylinder is embedded in the lamp cap, the outer heat dissipation cylinder is sleeved on the inner heat dissipation cylinder, the bottom of the outer heat dissipation cylinder abuts against the upper end of the main body, the upper end of the outer heat dissipation cylinder is buckled with the outer wall of the inner heat dissipation cylinder, an annular cavity is formed between the outer heat dissipation cylinder and the light-transmitting cover, the heat emitted by the light source plate enters the annular cavity, the heat can be dissipated outward through the outer heat dissipation cylinder and inward through the inner heat dissipation cylinder, the heat dissipation area is large, the heat dissipation performance is good, the LED bulb can be applied to the scene with small volume and large power, the LED bulb does not need to add components, the structure is simple, the assembly is convenient, the cost is low, and the stability is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lighting lamps, in particular to a LED bulb. BACKGROUND

[0002] The LED bulb is a kind of solid-state semiconductor device that can convert electrical energy into visible light. In the conversion process, a large amount of heat is generated. The bottom surface of the traditional LED bulb is mostly a whole surface without holes. This design can only dissipate heat through the outer wall of the LED bulb, and the heat dissipation performance is poor. The small LED bulb has a relatively small surface area, and the heat dissipation performance is even worse. It is difficult to improve the power and the lighting effect is limited.

[0003] In order to solve this problem, LED bulbs with internal heat dissipation channels to enhance heat dissipation performance have appeared in the market. For example, Chinese patents CN108167672A, CN102798013A and CN213656348A disclose such LED bulbs. However, this kind of solution needs to add multiple components, which makes the structure of the LED bulb more complex. Since there are many components, screws, glue and other methods are needed for fixation, which is not convenient for assembly, has high cost, high probability of component and component connection failure, and poor stability. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide an LED bulb with good heat dissipation performance, simple structure, convenient assembly, low cost, good stability and applicability to small volume and high power scenarios.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present application is an LED bulb, comprising:

[0006] a lamp holder;

[0007] a light source plate, the light source plate is annular, a plurality of LED lamp beads are arranged on the light source plate, and the light source plate is connected to the lamp holder through a power line;

[0008] a light-transmitting cover, the light-transmitting cover comprises a bowl-shaped main body and a thin-walled inner heat dissipation cylinder, a circular hole is arranged at the center of the bottom surface of the main body, the inner heat dissipation cylinder is arranged in and tightly pressed in the inner hole of the light source plate, the bottom of the inner heat dissipation cylinder is connected to the hole, and the top of the inner heat dissipation cylinder is embedded in the lamp holder;

[0009] a heat dissipation body, the heat dissipation body comprises an outer heat dissipation cylinder and a heat dissipation fin connected to the outer wall of the outer heat dissipation cylinder, the outer heat dissipation cylinder is sleeved on the inner heat dissipation cylinder, the bottom of the outer heat dissipation cylinder abuts against the upper end of the main body, the upper end of the outer heat dissipation cylinder is engaged with the outer wall of the inner heat dissipation cylinder, and an annular cavity is formed between the outer heat dissipation cylinder and the light-transmitting cover.

[0010] Preferably, the annular cavity is gradually inwardly tapered from bottom to top.

[0011] Preferably, the bottom of the outer heat dissipation cylinder is provided with an outwardly horizontally extending skirt, the lower surface of the skirt is attached to the upper surface of the light source plate, and the attached area is 35-45% of the area of the upper surface of the light source plate.

[0012] Further preferably, the outer edge of the skirt is folded downward to form an annular enclosing wall, which encloses the outer wall of the upper end of the main body and abuts against the annular flange connected to the outer wall.

[0013] Further preferably, the lower surface of the skirt is connected with a downwardly protruding annular clamping groove, and the outer wall of the light source plate is tightly squeezed in the annular clamping groove.

[0014] Further preferably, the annular clamping groove is composed of multiple arc-shaped enclosing walls arranged at intervals.

[0015] Preferably, the outer wall of the upper end of the inner heat dissipation cylinder is provided with a press-in reverse buckle, when the outer heat dissipation cylinder is sleeved on the inner heat dissipation cylinder, the reverse buckle abuts against the upper end surface of the outer heat dissipation cylinder, so that the outer heat dissipation cylinder is buckled with the inner heat dissipation cylinder, and the reverse buckle has at least two, which are uniformly distributed along the axial line of the inner heat dissipation cylinder.

[0016] Preferably, the bottom of the inner heat dissipation cylinder is in the shape of a trumpet mouth opening outwardly, and the outer wall of the upper end of the inner heat dissipation cylinder is provided with a stepped surface that is inwardly tapered, when the outer heat dissipation cylinder is buckled on the inner heat dissipation cylinder, the stepped surface abuts against the upper end tapered portion of the outer heat dissipation cylinder, so as to define the limit position of the downward movement of the outer heat dissipation cylinder.

[0017] Further preferably, a wire hole for passing the power line is formed in the inner heat dissipation cylinder, the wire hole extends along the up-down direction and penetrates through the stepped surface, and the inner wall of the outer heat dissipation cylinder is provided with a limiting block, when the outer heat dissipation cylinder is buckled on the inner heat dissipation cylinder, the limiting block is inserted in the wire hole, so as to limit the axial rotation of the outer heat dissipation cylinder.

[0018] Further preferably, the heat dissipation fins longitudinally extend, there are multiple heat dissipation fins which are uniformly distributed along the axial line of the outer heat dissipation cylinder, and the outer end surface of the heat dissipation fin away from the outer heat dissipation cylinder is an arc surface that is concave inwardly in the middle part.

[0019] Thanks to the use of the above technical solutions, the present application has the following advantages compared with the prior art:

[0020] The LED bulb provided by the application comprises a lamp cap, a ring-shaped light source plate, a light-transmitting cover with a bowl-shaped main body and a thin-walled inner heat dissipation cylinder, a heat dissipation body with an outer heat dissipation cylinder and heat dissipation fins, a circular hole is formed in the center of the bottom surface of the main body, the inner heat dissipation cylinder is arranged in and tightly pressed in the inner hole of the light source plate, the bottom of the inner heat dissipation cylinder is connected with the hole of the circular hole, the top of the inner heat dissipation cylinder is embedded in the lamp cap, the outer heat dissipation cylinder is sleeved on the inner heat dissipation cylinder, the bottom of the outer heat dissipation cylinder abuts against the upper end of the main body, the upper end of the outer heat dissipation cylinder is buckled with the outer wall of the inner heat dissipation cylinder, a ring-shaped cavity is formed between the outer heat dissipation cylinder and the light-transmitting cover, the heat emitted by the light source plate enters the ring-shaped cavity, the heat can be dissipated outward through the outer heat dissipation cylinder and inward through the inner heat dissipation cylinder, the heat dissipation area is large, the heat dissipation performance is good, the LED bulb can be applied to the scene with small volume and large power, the LED bulb does not need to add components, the structure is simple, the assembly is convenient, the cost is low, and the stability is good. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a front view of a preferred embodiment of the application.

[0022] Figure 2 is Figure 1 a bottom view of the preferred embodiment of the application.

[0023] Figure 3 , Figure 4 is Figure 1 a perspective view of the preferred embodiment of the application from different angles.

[0024] Figure 5 is Figure 4 an assembly and disassembly schematic view of the preferred embodiment of the application.

[0025] Figure 6 is Figure 1 a sectional view of the preferred embodiment of the application in the A-A direction.

[0026] Figure 7 is Figure 2 a sectional view of the preferred embodiment of the application in the B-B direction.

[0027] Figure 8 is Figure 1 a perspective view of the heat dissipation body in the preferred embodiment of the application.

[0028] Figure 9 is Figure 1 a sectional view of the heat dissipation body in the preferred embodiment of the application.

[0029] The components are as follows: 10. Lamp holder; 11. Power cord; 20. Light source board; 21. LED beads; 22. Inner hole; 23. Outer wall; 30. Light-transmitting cover; 31. Main body; 311. Round hole; 312. Annular flange; 32. Inner heat sink; 321. Inverted; 322. Stepped surface; 323. Wire hole; 40. Heat sink; 41. Outer heat sink; 411. Skirt; 412. Annular enclosure; 413. Annular groove; 414. Arc-shaped enclosure; 415. Narrowing; 416. Limiting block; 42. Heat dissipation fins; 43. Annular cavity. Detailed Implementation

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0031] like Figures 1 to 9 As shown, the LED bulb provided by this invention includes: a lamp holder 10, a light source board 20, a light-transmitting cover 30, and a heat sink 40. The lamp holder 10 uses standard lamp holders such as E26 / E27 or E39 / E40, which are very convenient for rotational applications. The light source board 20 is ring-shaped and uses an aluminum plate with a thermal conductivity of 1.0 W / (m•K) as the substrate. After an insulating layer is applied, a control module (not shown in the figure) and LED beads 21 are mounted on the light source board 20 using a surface mount technology (SMT) machine. Several LED beads 21 are arranged on the lower surface of the light source board 20. The LED beads 21 use high-efficiency LEDs with a luminous efficacy of 150 LM / W, which is more than 70% more energy-efficient than traditional incandescent bulbs and has a long lifespan. With a lifespan exceeding 30,000 hours, more than ten times that of traditional incandescent lamps, these LED beads 21 are evenly distributed along the axis of the light source board 20. The control module on the light source board 20 is connected to the lamp holder 10 via a power line 11. The light-transmitting cover 30 is integrally injection molded from high-transmittance PC or modified PP material, achieving a light transmittance of 91%-96%. The light-transmitting cover 30 includes a bowl-shaped main body 31 and a thin-walled inner heat sink 32. A circular hole 311 is opened at the center of the bottom surface of the main body 31. The inner heat sink 32 passes through and is squeezed into the inner hole 22 of the light source board 20. The bottom of the inner heat sink 32 is integrated with the edge of the circular hole 311, and the top of the inner heat sink 32 is embedded in the lamp holder 10. The heat sink 40 has a thermal conductivity of 100%. The die-cast aluminum radiator with W / (m•K) has high heat dissipation efficiency and light weight. The heat dissipation body 40 includes an outer heat dissipation cylinder 41 and heat dissipation fins 42 connected to the outer wall of the outer heat dissipation cylinder 41. The outer heat dissipation cylinder 41 is sleeved on the inner heat dissipation cylinder 32. The bottom of the outer heat dissipation cylinder 41 abuts against the upper end of the main body 31, and the upper end of the outer heat dissipation cylinder 41 is engaged with the outer wall of the inner heat dissipation cylinder 32, forming an annular cavity 43 between the outer heat dissipation cylinder 41 and the light-transmitting cover 30.

[0032] The advantage of the arrangement is that an annular cavity is formed between the outer heat dissipation cylinder and the light-transmitting cover, the heat emitted by the light source plate enters the annular cavity, and the heat can be dissipated outward through the outer heat dissipation cylinder and inward through the inner heat dissipation cylinder, so that the heat dissipation area is large, the heat dissipation performance is good, and the LED lamp can be applied to a small-size and high-power scene. The small size refers to that the overall height of the LED lamp can be controlled to be less than 150 mm, and the diameter can be controlled to be less than 130 mm. In the patent, the height (including the lamp holder) is 147.5 mm, and the diameter is 128 mm. The high power refers to that the power of the LED lamp can be as high as 80 W. The LED lamp is composed of the lamp holder, the light source plate, the light-transmitting cover and the heat dissipation body without additional components, so that the structure is simple, the assembly is convenient, the material cost and assembly cost are low, the components are few, the connection between the components is less, the probability of failure is low, and the stability is good.

[0033] In the embodiment, the annular cavity 43 is gradually inwardly tapered from bottom to top, and the inward tapering is mainly formed by the outer heat dissipation cylinder 41 with a gradually decreasing inner diameter from bottom to top. In this way, the heat dissipation efficiency can be improved.

[0034] In the embodiment, the bottom of the outer heat dissipation cylinder 41 is provided with a horizontally outwardly extending skirt 411, and the lower surface of the skirt 411 is attached to the upper surface of the light source plate 20. The attachment area is 35%-45% of the area of the upper surface of the light source plate 20. In this way, the heat transfer efficiency from the light source plate 20 to the outer heat dissipation cylinder 41 can be improved, and enough area is left on the light source plate 20 for mounting electronic components.

[0035] In the embodiment, the outer edge of the skirt 411 is downwardly folded to form an annular enclosing wall 412, which surrounds the outer wall of the upper end of the main body 31 and abuts against the annular flange 312 connected to the outer wall 31. In this way, the sealing effect can be improved while maintaining the appearance, and light leakage can be prevented.

[0036] In the embodiment, the lower surface of the skirt 411 is connected to a downwardly protruding annular clamping groove 413, and the inner diameter of the annular clamping groove 413 is 0.1-0.15 mm smaller than the outer diameter of the light source plate 20. In this way, the outer wall 23 of the light source plate 20 can be tightly squeezed in the annular clamping groove 413 through interference fit, so that the light source plate and the heat dissipation body 40 form an integral whole, and assembly is facilitated. Specifically, the annular clamping groove 413 is composed of multiple arc-shaped enclosing walls 414 arranged at intervals. In this way, the light source plate 20 and / or the annular clamping groove 413 can be conveniently disassembled, and deformation of the light source plate 20 and / or the annular clamping groove 413 caused by different thermal expansion rates of the light source plate 20 and the annular clamping groove 413 can be avoided.

[0037] In the embodiment, the upper end outer wall of the inner heat dissipation cylinder 32 is provided with a pressing type reverse buckle 321, the pressing type reverse buckle 321 refers to that the reverse buckle can be flat with the outer wall of the inner heat dissipation cylinder 32 or be retracted into the outer wall of the inner heat dissipation cylinder 32 by pressing, and the reverse buckle can be restored automatically under the action of elastic force, so that the setting can facilitate disassembly, when the outer heat dissipation cylinder 41 is sleeved on the inner heat dissipation cylinder 32, the reverse buckle 321 abuts against the upper end surface of the outer heat dissipation cylinder 41, so that the outer heat dissipation cylinder 41 is buckled with the inner heat dissipation cylinder 32, the reverse buckle 321 has at least two, the two reverse buckles 321 are uniformly distributed along the axial line of the inner heat dissipation cylinder 32, so that the stability during buckling can be enhanced.

[0038] In the embodiment, the bottom of the inner heat dissipation cylinder 32 is a horn-shaped opening outward, the upper end outer wall of the inner heat dissipation cylinder 32 is provided with a stepped surface 322 retracted inward, when the outer heat dissipation cylinder 41 is buckled on the inner heat dissipation cylinder 32, the stepped surface 322 abuts against the upper end portion reentrant 415 of the outer heat dissipation cylinder 41, for limiting the limit position of the downward movement of the outer heat dissipation cylinder 41; at the same time, the inner heat dissipation cylinder 32 is provided with a wire hole 323 for penetrating the power line 11, the wire hole 323 extends along the up-down direction and penetrates the stepped surface 322, the inner wall of the outer heat dissipation cylinder 41 is provided with a limiting block 416, when the outer heat dissipation cylinder 41 is buckled on the inner heat dissipation cylinder 32, the limiting block 416 is inserted into the wire hole 323, for limiting the axial rotation of the outer heat dissipation cylinder 41, so that the buckling effect of the outer heat dissipation cylinder 41 and the inner heat dissipation cylinder 32 can be ensured, and the wire hole 323 can also be used to communicate the annular cavity 43 and the cavity inside the inner heat dissipation cylinder 32, so that part of the convection heat dissipation can be realized.

[0039] In the embodiment, the heat dissipation fins 42 extend longitudinally, the heat dissipation fins 42 have a plurality of and are uniformly distributed along the axial line of the outer heat dissipation cylinder 41, the end surface of the heat dissipation fin 42 away from the outer heat dissipation cylinder 41 is an arc surface with a middle portion inwardly recessed, so as to further improve the heat dissipation performance.

[0040] The application also provides an assembling method of the LED bulb, comprising the following steps:

[0041] S1. producing a light source plate and welding and connecting one end of the power line and the light source plate;

[0042] S2. pressing and combining the light source plate in the annular clamping groove of the heat dissipation body skirt through interference fit, so that the adhering area of the upper surface of the light source plate and the lower surface of the heat dissipation body skirt accounts for 35-45% of the total area of the upper surface of the light source plate;

[0043] S3. initially inserting the inner heat dissipation cylinder of the light-transmitting cover into the outer heat dissipation cylinder, and leading the other end of the power line out upward through the wire hole on the inner heat dissipation cylinder of the light-transmitting cover;

[0044] S4. completely inserting the inner heat dissipation cylinder into the outer heat dissipation cylinder, so that the two are buckled;

[0045] S5. Rivet the end of the upwardly leading power line to the lamp cap;

[0046] S6. Insert the upper end of the inner heat-dissipating cylinder into the lamp cap and press it tightly, so as to connect the lamp cap with the light-transmitting cover, and complete the assembly.

[0047] It should be noted that in the present application, the uniform distribution refers to the annular array distribution, and the power line adopts hard wire.

[0048] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. An LED light bulb, characterized by, It comprises: a lamp head; a light source plate in the shape of a ring, provided with a plurality of LED lamp beads, and connected with the lamp head through a power line; a light-transmitting cover comprising a bowl-shaped main body and a thin-walled inner heat dissipation cylinder, a circular hole is formed in the center of the bottom surface of the main body, the inner heat dissipation cylinder is inserted into and tightly fitted in the inner hole of the light source plate, the bottom of the inner heat dissipation cylinder is integrated with the hole along the hole, and the top of the inner heat dissipation cylinder is embedded in the lamp head; a heat dissipation body comprising an outer heat dissipation cylinder and heat dissipation fins connected to the outer wall of the outer heat dissipation cylinder, the outer heat dissipation cylinder is sleeved on the inner heat dissipation cylinder, the bottom of the outer heat dissipation cylinder abuts against the upper end of the main body, and the upper end of the outer heat dissipation cylinder is coupled with the outer wall of the inner heat dissipation cylinder to form an annular cavity between the outer heat dissipation cylinder and the light-transmitting cover.

2. The LED bulb of claim 1, wherein: The annular cavity is gradually inwardly tapered from bottom to top.

3. The LED bulb of claim 1, wherein: The bottom of the outer heat dissipation cylinder is provided with an outwardly horizontally extending skirt, the lower surface of the skirt is attached to the upper surface of the light source plate, and the attached area is 35%-45% of the upper surface area of the light source plate.

4. The LED bulb of claim 3, wherein: The outer edge of the skirt is downwardly folded to form an annular enclosing wall, the annular enclosing wall sleeves the outer wall of the upper end of the main body and abuts against the annular flange connected to the outer wall.

5. The LED bulb of claim 3, wherein: The lower surface of the skirt is connected with a downwardly protruding annular clamping groove, and the outer wall of the light source plate is tightly fitted in the annular clamping groove.

6. The LED bulb of claim 5, wherein: The annular clamping groove is composed of a plurality of arc-shaped enclosing walls arranged at intervals.

7. The LED bulb of claim 1, wherein: The outer wall of the upper end of the inner heat dissipation cylinder is provided with a press-in reverse buckle, when the outer heat dissipation cylinder is sleeved on the inner heat dissipation cylinder, the reverse buckle abuts against the upper end surface of the outer heat dissipation cylinder to couple the outer heat dissipation cylinder with the inner heat dissipation cylinder, and the reverse buckle has at least two, which are uniformly distributed along the axial line of the inner heat dissipation cylinder.

8. The LED bulb of claim 1, wherein: The bottom of the inner heat dissipation cylinder is in the shape of a trumpet mouth opening outwardly, and the outer wall of the upper end of the inner heat dissipation cylinder is provided with an inwardly tapered stepped surface, when the outer heat dissipation cylinder is coupled on the inner heat dissipation cylinder, the stepped surface abuts against the upper end tapered opening of the outer heat dissipation cylinder to define the limit position of the downward movement of the outer heat dissipation cylinder.

9. The LED bulb of claim 8, wherein: A threading hole is formed in the inner heat dissipation cylinder for threading the power line, the threading hole extends along the up-down direction and penetrates through the stepped surface, and the inner wall of the outer heat dissipation cylinder is provided with a limiting block, when the outer heat dissipation cylinder is coupled on the inner heat dissipation cylinder, the limiting block is inserted into the threading hole to limit the axial rotation of the outer heat dissipation cylinder.

10. The LED bulb of any of claims 1-9, wherein: The heat dissipation fins longitudinally extend, a plurality of heat dissipation fins are uniformly distributed along the axial line of the outer heat dissipation cylinder, and the outer end surface of the heat dissipation fins away from the outer heat dissipation cylinder is an arc surface with a middle part recessed inwardly.

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